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/srv/reproducible-results/rbuild-debian/r-b-build.jHw8QM41/b1/erlang_27.3.3+dfsg-1_arm64.changes vs.
/srv/reproducible-results/rbuild-debian/r-b-build.jHw8QM41/b2/erlang_27.3.3+dfsg-1_arm64.changes
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26 ·640e4bb5c9a840ff5d671d281a4f9b54·898692·interpreters·optional·erlang-mnesia_27.3.3+dfsg-1_arm64.deb26 ·640e4bb5c9a840ff5d671d281a4f9b54·898692·interpreters·optional·erlang-mnesia_27.3.3+dfsg-1_arm64.deb
27 ·33ca402b13c54ed9494c0b341fe1bcc0·93316·interpreters·optional·erlang-mode_27.3.3+dfsg-1_all.deb27 ·33ca402b13c54ed9494c0b341fe1bcc0·93316·interpreters·optional·erlang-mode_27.3.3+dfsg-1_all.deb
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30 ·25f5109440bb63fefcca1271b2a42334·59604·debug·optional·erlang-odbc-dbgsym_27.3.3+dfsg-1_arm64.deb30 ·25f5109440bb63fefcca1271b2a42334·59604·debug·optional·erlang-odbc-dbgsym_27.3.3+dfsg-1_arm64.deb
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erlang-doc_27.3.3+dfsg-1_all.deb
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1 Package:·erlang-doc1 Package:·erlang-doc
2 Source:·erlang2 Source:·erlang
3 Version:·1:27.3.3+dfsg-13 Version:·1:27.3.3+dfsg-1
4 Architecture:·all4 Architecture:·all
5 Maintainer:·Debian·Erlang·Packagers·<pkg-erlang-devel@lists.alioth.debian.org>5 Maintainer:·Debian·Erlang·Packagers·<pkg-erlang-devel@lists.alioth.debian.org>
6 Installed-Size:·958576 Installed-Size:·95856
7 Depends:·libjs-jquery,·libjs-jquery-ui7 Depends:·libjs-jquery,·libjs-jquery-ui
8 Suggests:·erlang:any8 Suggests:·erlang:any
9 Conflicts:·erlang-base:any·(<<·1:13.b.4),·erlang-base-hipe:any,·erlang-doc-html9 Conflicts:·erlang-base:any·(<<·1:13.b.4),·erlang-base-hipe:any,·erlang-doc-html
10 Replaces:·erlang-doc-html10 Replaces:·erlang-doc-html
11 Provides:·erlang-doc-html11 Provides:·erlang-doc-html
12 Section:·doc12 Section:·doc
13 Priority:·optional13 Priority:·optional
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135 <a·href="applications.html#app_dir">directory·structure</a>.</p><p><a·href=""·id="callback_module"></a></p><h2·id="application-callback-module"·class="section-heading">135 <a·href="applications.html#app_dir">directory·structure</a>.</p><p><a·href=""·id="callback_module"></a></p><h2·id="application-callback-module"·class="section-heading">
136 ··<a·href="#application-callback-module"·class="hover-link">136 ··<a·href="#application-callback-module"·class="hover-link">
137 ····<i·class="ri-link-m"·aria-hidden="true"></i>137 ····<i·class="ri-link-m"·aria-hidden="true"></i>
138 ··</a>138 ··</a>
139 ··<span·class="text">Application·Callback·Module</span>139 ··<span·class="text">Application·Callback·Module</span>
140 </h2>140 </h2>
141 <p>How·to·start·and·stop·the·code·for·the·application,·including·its·supervision141 <p>How·to·start·and·stop·the·code·for·the·application,·including·its·supervision
142 tree,·is·described·by·two·callback·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start</span><span·class="p"·data-group-id="4817617640-1">(</span><span·class="n">StartType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="4817617640-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4817617640-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="4817617640-2">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="4817617640-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4817617640-3">}</span><span·class="w"> 
143 </span><span·class="nf">stop</span><span·class="p"·data-group-id="4817617640-4">(</span><span·class="n">State</span><span·class="p"·data-group-id="4817617640-4">)</span></code></pre><ul><li><code·class="inline">start/2</code>·is·called·when·starting·the·ap[·...·truncated·by·diffoscope;·len:·30,·SHA:·e1e51cf208e8b479c99ec5ac74636ae6d670d0591b55b4bb7dda9657bce79190·...·]142 tree,·is·described·by·two·callback·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start</span><span·class="p"·data-group-id="7736178718-1">(</span><span·class="n">StartType</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·740,·SHA:·9cf3c5382c5731010fb2cb9327aefb75b0d8c54f91b1bdbbea408a58afc98c3a·...·]
 143 </span><span·class="nf">stop</span><span·class="p"·data-group-id="7736178718-4">(</span><span·class="n">State</span><span·class="p"·data-group-id="7736178718-4">)</span></code></pre><ul><li><code·class="inline">start/2</code>·is·called·when·starting·the·application·and·is·to·create·the
144 supervision·tree·by·starting·the·top·supervisor.·It·is·expected·to·return·the144 supervision·tree·by·starting·the·top·supervisor.·It·is·expected·to·return·the
145 pid·of·the·top·supervisor·and·an·optional·term,·<code·class="inline">State</code>,·which·defaults·to145 pid·of·the·top·supervisor·and·an·optional·term,·<code·class="inline">State</code>,·which·defaults·to
146 <code·class="inline">[]</code>.·This·term·is·passed·as·is·to·<code·class="inline">stop/1</code>.</li><li><code·class="inline">StartType</code>·is·usually·the·atom·<code·class="inline">normal</code>.·It·has·other·values·only·in·the·case146 <code·class="inline">[]</code>.·This·term·is·passed·as·is·to·<code·class="inline">stop/1</code>.</li><li><code·class="inline">StartType</code>·is·usually·the·atom·<code·class="inline">normal</code>.·It·has·other·values·only·in·the·case
147 of·a·takeover·or·failover;·see147 of·a·takeover·or·failover;·see
148 <a·href="distributed_applications.html">Distributed·Applications</a>.</li><li><code·class="inline">StartArgs</code>·is·defined·by·the·key·<code·class="inline">mod</code>·in·the148 <a·href="distributed_applications.html">Distributed·Applications</a>.</li><li><code·class="inline">StartArgs</code>·is·defined·by·the·key·<code·class="inline">mod</code>·in·the
149 <a·href="applications.html#appl_res_file">application·resource·file</a>.</li><li><code·class="inline">stop/1</code>·is·called·<em>after</em>·the·application·has·been·stopped·and·is·to·do·any149 <a·href="applications.html#appl_res_file">application·resource·file</a>.</li><li><code·class="inline">stop/1</code>·is·called·<em>after</em>·the·application·has·been·stopped·and·is·to·do·any
150 necessary·cleaning·up.·The·actual·stopping·of·the·application,·that·is,150 necessary·cleaning·up.·The·actual·stopping·of·the·application,·that·is,
151 shutting·down·the·supervision·tree,·is·handled·automatically·as·described·in151 shutting·down·the·supervision·tree,·is·handled·automatically·as·described·in
152 <a·href="applications.html#stopping">Starting·and·Stopping·Applications</a>.</li></ul><p><a·href=""·id="ch_app"></a></p><p>Example·of·an·application·callback·module·for·packaging·the·supervision·tree152 <a·href="applications.html#stopping">Starting·and·Stopping·Applications</a>.</li></ul><p><a·href=""·id="ch_app"></a></p><p>Example·of·an·application·callback·module·for·packaging·the·supervision·tree
153 from·<a·href="sup_princ.html#ex">Supervisor·Behaviour</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5853223947-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="5853223947-1">)</span><span·class="p">.</span><span·class="w">153 from·<a·href="sup_princ.html#ex">Supervisor·Behaviour</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6505243432-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="6505243432-1">)</span><span·class="p">.</span><span·class="w">
154 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="5853223947-2">(</span><span·class="ss">application</span><span·class="p"·data-group-id="5853223947-2">)</span><span·class="p">.</span><span·class="w">154 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="6505243432-2">(</span><span·class="ss">application</span><span·class="p"·data-group-id="6505243432-2">)</span><span·class="p">.</span><span·class="w">
155 </span><span·class="w">155 </span><span·class="w">
156 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5853223947-3">(</span><span·class="p"·data-group-id="5853223947-4">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·a225d8ceff4a065d6fd9d310d3c637012e20559c7db23e9c767d8c127938834c·...·]-3">)</span><span·class="p">.</span><span·class="w">156 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6505243432-3">(</span><span·class="p"·data-group-id="6505243432-4">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·5a3127a53c4fbc4e70c55f828b253c3558a79da916faf4997da22962701d9833·...·]-3">)</span><span·class="p">.</span><span·class="w">
  
157 </span><span·class="nf">start</span><span·class="p"·data-group-id="5853223947-5">(</span><span·class="p">_</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="5853223947-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">start</span><span·class="p"·data-group-id="6505243432-5">(</span><span·class="p">_</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="6505243432-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="nc">ch_sup</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="5853223947-6">(</span><span·class="p"·data-group-id="5853223947-6">)</span><span·class="p">.</span><span·class="w">158 ····</span><span·class="nc">ch_sup</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="6505243432-6">(</span><span·class="p"·data-group-id="6505243432-6">)</span><span·class="p">.</span><span·class="w">
  
159 </span><span·class="nf">stop</span><span·class="p"·data-group-id="5853223947-7">(</span><span·class="p">_</span><span·class="n">State</span><span·class="p"·data-group-id="5853223947-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 </span><span·class="nf">stop</span><span·class="p"·data-group-id="6505243432-7">(</span><span·class="p">_</span><span·class="n">State</span><span·class="p"·data-group-id="6505243432-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>A·library·application·that·cannot·be·started·or·stopped·does·not·need·any160 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>A·library·application·that·cannot·be·started·or·stopped·does·not·need·any
161 application·callback·module.</p><p><a·href=""·id="appl_res_file"></a></p><h2·id="application-resource-file"·class="section-heading">161 application·callback·module.</p><p><a·href=""·id="appl_res_file"></a></p><h2·id="application-resource-file"·class="section-heading">
162 ··<a·href="#application-resource-file"·class="hover-link">162 ··<a·href="#application-resource-file"·class="hover-link">
163 ····<i·class="ri-link-m"·aria-hidden="true"></i>163 ····<i·class="ri-link-m"·aria-hidden="true"></i>
164 ··</a>164 ··</a>
165 ··<span·class="text">Application·Resource·File</span>165 ··<span·class="text">Application·Resource·File</span>
166 </h2>166 </h2>
Offset 173, 22 lines modifiedOffset 173, 22 lines modified
173 keys.</li></ul><p>The·contents·of·a·minimal·<code·class="inline">.app</code>·file·for·a·library·application·<code·class="inline">libapp</code>·looks173 keys.</li></ul><p>The·contents·of·a·minimal·<code·class="inline">.app</code>·file·for·a·library·application·<code·class="inline">libapp</code>·looks
174 as·follows:</p><pre><code·class="text">{application,·libapp,·[]}.</code></pre><p>The·contents·of·a·minimal·<code·class="inline">.app</code>·file·<code·class="inline">ch_app.app</code>·for·a·supervision·tree174 as·follows:</p><pre><code·class="text">{application,·libapp,·[]}.</code></pre><p>The·contents·of·a·minimal·<code·class="inline">.app</code>·file·<code·class="inline">ch_app.app</code>·for·a·supervision·tree
175 application·like·<code·class="inline">ch_app</code>·looks·as·follows:</p><pre><code·class="text">{application,·ch_app,175 application·like·<code·class="inline">ch_app</code>·looks·as·follows:</p><pre><code·class="text">{application,·ch_app,
176 ·[{mod,·{ch_app,[]}}]}.</code></pre><p>The·key·<code·class="inline">mod</code>·defines·the·callback·module·and·start·argument·of·the·application,176 ·[{mod,·{ch_app,[]}}]}.</code></pre><p>The·key·<code·class="inline">mod</code>·defines·the·callback·module·and·start·argument·of·the·application,
177 in·this·case·<code·class="inline">ch_app</code>·and·<code·class="inline">[]</code>,·respectively.·This·means·that·the·following·is177 in·this·case·<code·class="inline">ch_app</code>·and·<code·class="inline">[]</code>,·respectively.·This·means·that·the·following·is
178 called·when·the·application·is·to·be·started:</p><pre><code·class="text">ch_app:start(normal,·[])</code></pre><p>The·following·is·called·when·the·application·is·stopped:</p><pre><code·class="text">ch_app:stop([])</code></pre><p>When·using·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>,·the·Erlang/OTP·tools·for·packaging·code·(see·Section178 called·when·the·application·is·to·be·started:</p><pre><code·class="text">ch_app:start(normal,·[])</code></pre><p>The·following·is·called·when·the·application·is·stopped:</p><pre><code·class="text">ch_app:stop([])</code></pre><p>When·using·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>,·the·Erlang/OTP·tools·for·packaging·code·(see·Section
179 <a·href="release_structure.html">Releases</a>),·the·keys·<code·class="inline">description</code>,·<code·class="inline">vsn</code>,·<code·class="inline">modules</code>,179 <a·href="release_structure.html">Releases</a>),·the·keys·<code·class="inline">description</code>,·<code·class="inline">vsn</code>,·<code·class="inline">modules</code>,
180 <code·class="inline">registered</code>,·and·<code·class="inline">applications</code>·are·also·to·be·specified:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1122160027-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">180 <code·class="inline">registered</code>,·and·<code·class="inline">applications</code>·are·also·to·be·specified:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2802172557-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">
181 ·</span><span·class="p"·data-group-id="1122160027-2">[</span><span·class="p"·data-group-id="1122160027-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="1122160027-3">}</span><span·class="p">,</span><span·class="w">181 ·</span><span·class="p"·data-group-id="2802172557-2">[</span><span·class="p"·data-group-id="2802172557-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="2802172557-3">}</span><span·class="p">,</span><span·class="w">
182 ··</span><span·class="p"·data-group-id="1122160027-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="1122160027-4">}</span><span·class="p">,</span><span·class="w">182 ··</span><span·class="p"·data-group-id="2802172557-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="2802172557-4">}</span><span·class="p">,</span><span·class="w">
183 ··</span><span·class="p"·data-group-id="1122160027-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1122160027-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·174,·SHA:·2d039a63b19124a2ae64cf8cd8d03483eef820cae22103a29274da768a70eda9·...·]7-5">}</span><span·class="p">,</span><span·class="w">183 ··</span><span·class="p"·data-group-id="2802172557-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2802172557-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·174,·SHA:·f948812a1cc2a58e84386e6045578f4a069747847fc6394f27de13467ce2f81b·...·]7-5">}</span><span·class="p">,</span><span·class="w">
184 ··</span><span·class="p"·data-group-id="1122160027-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1122160027-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="1122160027-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·21,·SHA:·b96e193c05394641939115da07c6bc61bcb5bf3cffd6edcfb0a3863530551cbf·...·]7-7">}</span><span·class="p">,</span><span·class="w">184 ··</span><span·class="p"·data-group-id="2802172557-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2802172557-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="2802172557-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·21,·SHA:·a639bf953e3fe9a78666c24079f9562874d6616559648048773a5c3fee09c2bf·...·]7-7">}</span><span·class="p">,</span><span·class="w">
185 ··</span><span·class="p"·data-group-id="1122160027-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1122160027-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·182,·SHA:·0991e9d5ee9b0eaeac9d37902e37567d114a3f003b9c6d56e6782a5325d5e2a0·...·]7-9">}</span><span·class="p">,</span><span·class="w">185 ··</span><span·class="p"·data-group-id="2802172557-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2802172557-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·182,·SHA:·f910feb2fbd4c5c88a23b184ef7039fedaf00c5c2fbb0ba090e28f68c30985b1·...·]7-9">}</span><span·class="p">,</span><span·class="w">
186 ··</span><span·class="p"·data-group-id="1122160027-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1122160027-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="1122160027-13">[</s[·...·truncated·by·diffoscope;·len:·152,·SHA:·f16f1036babe22675808a74f8ef937b007529c266163b554d0a6a45b678fc6b0·...·]7-11">}</span><span·class="w">186 ··</span><span·class="p"·data-group-id="2802172557-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2802172557-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="2802172557-13">[</s[·...·truncated·by·diffoscope;·len:·152,·SHA:·becb05d9024a88649d5832103a30e29a10cd5feb2b24d6b67068318dee3d7072·...·]7-11">}</span><span·class="w">
187 ·</span><span·class="p"·data-group-id="1122160027-2">]</span><span·class="p"·data-group-id="1122160027-1">}</span><span·class="p">.</span></code></pre><ul><li><code·class="inline">description</code>·-·A·short·description,·a·string.·Defaults·to·<code·class="inline">&quot;&quot;</code>.</li><li><code·class="inline">vsn</code>·-·Version·number,·a·string.·Defaults·to·<code·class="inline">&quot;&quot;</code>.</li><li><code·class="inline">modules</code>·-·All·modules·<em>introduced</em>·by·this·application.·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·uses187 ·</span><span·class="p"·data-group-id="2802172557-2">]</span><span·class="p"·data-group-id="2802172557-1">}</span><span·class="p">.</span></code></pre><ul><li><code·class="inline">description</code>·-·A·short·description,·a·string.·Defaults·to·<code·class="inline">&quot;&quot;</code>.</li><li><code·class="inline">vsn</code>·-·Version·number,·a·string.·Defaults·to·<code·class="inline">&quot;&quot;</code>.</li><li><code·class="inline">modules</code>·-·All·modules·<em>introduced</em>·by·this·application.·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·uses
188 this·list·when·generating·boot·scripts·and·tar·files.·A·module·must·only188 this·list·when·generating·boot·scripts·and·tar·files.·A·module·must·only
189 be·included·in·one·application.·Defaults·to·<code·class="inline">[]</code>.</li><li><code·class="inline">registered</code>·-·All·names·of·registered·processes·in·the·application.189 be·included·in·one·application.·Defaults·to·<code·class="inline">[]</code>.</li><li><code·class="inline">registered</code>·-·All·names·of·registered·processes·in·the·application.
190 <a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·uses·this·list·to·detect·name·clashes·between·applications.190 <a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·uses·this·list·to·detect·name·clashes·between·applications.
191 Defaults·to·<code·class="inline">[]</code>.</li><li><code·class="inline">applications</code>·-·All·applications·that·must·be·started·before·this191 Defaults·to·<code·class="inline">[]</code>.</li><li><code·class="inline">applications</code>·-·All·applications·that·must·be·started·before·this
192 application·is·started.·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·uses·this·list·to·generate·correct·boot192 application·is·started.·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·uses·this·list·to·generate·correct·boot
193 scripts.·Defaults·to·<code·class="inline">[]</code>.·Notice·that·all·applications·have·dependencies·to193 scripts.·Defaults·to·<code·class="inline">[]</code>.·Notice·that·all·applications·have·dependencies·to
194 at·least·Kernel·and·STDLIB.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>For·details·about·the·syntax·and·contents·of·the·application·resource·file,194 at·least·Kernel·and·STDLIB.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>For·details·about·the·syntax·and·contents·of·the·application·resource·file,
Offset 300, 38 lines modifiedOffset 300, 38 lines modified
300 stop·applications.</p><h2·id="loading-and-unloading-applications"·class="section-heading">300 stop·applications.</p><h2·id="loading-and-unloading-applications"·class="section-heading">
301 ··<a·href="#loading-and-unloading-applications"·class="hover-link">301 ··<a·href="#loading-and-unloading-applications"·class="hover-link">
302 ····<i·class="ri-link-m"·aria-hidden="true"></i>302 ····<i·class="ri-link-m"·aria-hidden="true"></i>
303 ··</a>303 ··</a>
304 ··<span·class="text">Loading·and·Unloading·Applications</span>304 ··<span·class="text">Loading·and·Unloading·Applications</span>
305 </h2>305 </h2>
306 <p>Before·an·application·can·be·started,·it·must·be·<em>loaded</em>.·The·application306 <p>Before·an·application·can·be·started,·it·must·be·<em>loaded</em>.·The·application
307 controller·reads·and·stores·the·information·from·the·<code·class="inline">.app</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">load</span><span·class="p"·data-group-id="3999670913-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="3999670913-1">)</span><span·class="p">.</span><span·class="w">307 controller·reads·and·stores·the·information·from·the·<code·class="inline">.app</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">load</span><span·class="p"·data-group-id="8595637562-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="8595637562-1">)</span><span·class="p">.</span><span·class="w">
308 </span><span·class="ss">ok</span><span·class="gp·unselectable">308 </span><span·class="ss">ok</span><span·class="gp·unselectable">
309 2&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">loaded_applications</span><span·class="p"·data-group-id="3999670913-2">(</span><span·class="p"·data-group-id="3999670913-2">)</span><span·class="p">.</span><span·class="w">309 2&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">loaded_applications</span><span·class="p"·data-group-id="8595637562-2">(</span><span·class="p"·data-group-id="8595637562-2">)</span><span·class="p">.</span><span·class="w">
310 </span><span·class="p"·data-group-id="3999670913-3">[</span><span·class="p"·data-group-id="3999670913-4">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;2.8.1.3&quot;</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·9935e2295475a627969774c14a7e01fc48d19029245c37952e0e085e93a94a43·...·]-4">}</span><span·class="p">,</span><span·class="w">310 </span><span·class="p"·data-group-id="8595637562-3">[</span><span·class="p"·data-group-id="8595637562-4">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;2.8.1.3&quot;</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·34954b097e5ca94b3499a20ff7a5cc828f2ec3ffb44b68e67107751dc015daab·...·]-4">}</span><span·class="p">,</span><span·class="w">
311 ·</span><span·class="p"·data-group-id="3999670913-5">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;1.11.4.3&quot;</span><span·class="p"·data-group-id="3999670913-5">}</span><span·class="p">,</span><span·class="w">311 ·</span><span·class="p"·data-group-id="8595637562-5">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;1.11.4.3&quot;</span><span·class="p"·data-group-id="8595637562-5">}</span><span·class="p">,</span><span·class="w">
312 ·</span><span·class="p"·data-group-id="3999670913-6">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="3999670913-6">}</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·6307707d53b1a3a07fcadf364e25a802594329a5288c177a8faa4ce07cf190c7·...·]-3">]</span></code></pre><p>An·application·that·has·been·stopped,·or·has·never·been·started,·can·be312 ·</span><span·class="p"·data-group-id="8595637562-6">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="8595637562-6">}</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·1988dcac84cd11c2b3101fe6d6c030125e34184e04058a4afa1cf33b1fb2a3ee·...·]-3">]</span></code></pre><p>An·application·that·has·been·stopped,·or·has·never·been·started,·can·be
313 unloaded.·The·information·about·the·application·is·erased·from·the·internal313 unloaded.·The·information·about·the·application·is·erased·from·the·internal
314 database·of·the·application·controller.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">unload</span><span·class="p"·data-group-id="0743888433-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="0743888433-1">)</span><span·class="p">.</span><span·class="w">314 database·of·the·application·controller.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">unload</span><span·class="p"·data-group-id="7659029302-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="7659029302-1">)</span><span·class="p">.</span><span·class="w">
315 </span><span·class="ss">ok</span><span·class="gp·unselectable">315 </span><span·class="ss">ok</span><span·class="gp·unselectable">
316 4&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">loaded_applications</span><span·class="p"·data-group-id="0743888433-2">(</span><span·class="p"·data-group-id="0743888433-2">)</span><span·class="p">.</span><span·class="w">316 4&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">loaded_applications</span><span·class="p"·data-group-id="7659029302-2">(</span><span·class="p"·data-group-id="7659029302-2">)</span><span·class="p">.</span><span·class="w">
317 </span><span·class="p"·data-group-id="0743888433-3">[</span><span·class="p"·data-group-id="0743888433-4">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;2.8.1.3&quot;</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·d3625c5ad918620c4ce1a304b26575ad9cfa6a6cac4571415960eef16feaf0da·...·]-4">}</span><span·class="p">,</span><span·class="w">317 </span><span·class="p"·data-group-id="7659029302-3">[</span><span·class="p"·data-group-id="7659029302-4">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;2.8.1.3&quot;</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·f51e12a9d8a2be956620574a5a69be70f63eb12216ce41369b33c6ec9978f5f0·...·]-4">}</span><span·class="p">,</span><span·class="w">
318 ·</span><span·class="p"·data-group-id="0743888433-5">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;1.11.4.3&quot;</span><span·class="p"·data-group-id="0743888433-5">}</span><span·cla[·...·truncated·by·diffoscope;·len:·32,·SHA:·8d890f112593a212831d05347e6b9dca9c13126810634774041b48fcfc86c208·...·]-3">]</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Loading/unloading·an·application·does·not·load/unload·the·code·used·by·the318 ·</span><span·class="p"·data-group-id="7659029302-5">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;1.11.4.3&quot;</span><span·class="p"·data-group-id="7659029302-5">}</span><span·cla[·...·truncated·by·diffoscope;·len:·32,·SHA:·c7ad193f04bf6dcda56f4448be49bdcf50efad3d10a2a1d11bd2ed5d29d641ab·...·]-3">]</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Loading/unloading·an·application·does·not·load/unload·the·code·used·by·the
319 application.·Code·loading·is·handled·in·the·usual·way·by·the·code·server.</p></section><p><a·href=""·id="stopping"></a></p><h2·id="starting-and-stopping-applications"·class="section-heading">319 application.·Code·loading·is·handled·in·the·usual·way·by·the·code·server.</p></section><p><a·href=""·id="stopping"></a></p><h2·id="starting-and-stopping-applications"·class="section-heading">
320 ··<a·href="#starting-and-stopping-applications"·class="hover-link">320 ··<a·href="#starting-and-stopping-applications"·class="hover-link">
321 ····<i·class="ri-link-m"·aria-hidden="true"></i>321 ····<i·class="ri-link-m"·aria-hidden="true"></i>
322 ··</a>322 ··</a>
323 ··<span·class="text">Starting·and·Stopping·Applications</span>323 ··<span·class="text">Starting·and·Stopping·Applications</span>
324 </h2>324 </h2>
325 <p>An·application·is·started·by·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6809326082-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="6809326082-1">)</span><span·class="p">.</span><span·class="w">325 <p>An·application·is·started·by·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8762397442-1">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="8762397442-1">)</span><span·class="p">.</span><span·class="w">
326 </span><span·class="ss">ok</span><span·class="gp·unselectable">326 </span><span·class="ss">ok</span><span·class="gp·unselectable">
327 6&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">which_applications</span><span·class="p"·data-group-id="6809326082-2">(</span><span·class="p"·data-group-id="6809326082-2">)</span><span·class="p">.</span><span·class="w">327 6&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">which_applications</span><span·class="p"·data-group-id="8762397442-2">(</span><span·class="p"·data-group-id="8762397442-2">)</span><span·class="p">.</span><span·class="w">
328 </span><span·class="p"·data-group-id="6809326082-3">[</span><span·class="p"·data-group-id="6809326082-4">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;2.8.1.3&quot;</span><span·clas[·...·truncated·by·diffoscope;·len:·30,·SHA:·6feef624b1eda093707cfa3573c88f68302781ddf6fff5bee20dbc4400370931·...·]2-4">}</span><span·class="p">,</span><span·class="w">328 </span><span·class="p"·data-group-id="8762397442-3">[</span><span·class="p"·data-group-id="8762397442-4">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;2.8.1.3&quot;</span><span·clas[·...·truncated·by·diffoscope;·len:·30,·SHA:·f347b2b0ca37e01500eab43af1c3aebca344115969df426a138d5603490625f2·...·]2-4">}</span><span·class="p">,</span><span·class="w">
329 ·</span><span·class="p"·data-group-id="6809326082-5">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;1.11.4.3&quot;</span><span·class="p"·data-group-id="6809326082-5">}</span><span·class="p">,</span><span·class="w">329 ·</span><span·class="p"·data-group-id="8762397442-5">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;ERTS··CXC·138·10&quot;</span><span·class="p">,</span><span·class="s">&quot;1.11.4.3&quot;</span><span·class="p"·data-group-id="8762397442-5">}</span><span·class="p">,</span><span·class="w">
330 ·</span><span·class="p"·data-group-id="6809326082-6">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="6809326082-6">}</span><span·class="p"[·...·truncated·by·diffoscope;·len:·25,·SHA:·a3ccbfa5523502290597b30166d8957d3449bb8afd5ab29c6bf8d0f96362f9d0·...·]2-3">]</span></code></pre><p>If·the·application·is·not·already·loaded,·the·application·controller·first·loads330 ·</span><span·class="p"·data-group-id="8762397442-6">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="8762397442-6">}</span><span·class="p"[·...·truncated·by·diffoscope;·len:·25,·SHA:·afe20586bebcae5f5043aabd565a5482fe9535f87c18345a49443c69f90383f3·...·]2-3">]</span></code></pre><p>If·the·application·is·not·already·loaded,·the·application·controller·first·loads
331 it·using·<a·href="../../lib/kernel-10.2.6/doc/html/application.html#load/1"><code·class="inline">application:load/1</code></a>.·It·checks·the·value·of·the·<code·class="inline">applications</code>·key·to331 it·using·<a·href="../../lib/kernel-10.2.6/doc/html/application.html#load/1"><code·class="inline">application:load/1</code></a>.·It·checks·the·value·of·the·<code·class="inline">applications</code>·key·to
332 ensure·that·all·applications·that·are·to·be·started·before·this·application·are332 ensure·that·all·applications·that·are·to·be·started·before·this·application·are
333 running.</p><p><a·href=""·id="application_master"></a></p><p>Following·that,·the·application·controller·creates·an·<em>application·master</em>·for333 running.</p><p><a·href=""·id="application_master"></a></p><p>Following·that,·the·application·controller·creates·an·<em>application·master</em>·for
334 the·application.</p><p>The·application·master·establishes·itself·as·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#group_leader/0">group334 the·application.</p><p>The·application·master·establishes·itself·as·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#group_leader/0">group
335 leader</a>·of·all·processes·in·the·application335 leader</a>·of·all·processes·in·the·application
336 and·will·forward·I/O·to·the·previous·group·leader.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·purpose·of·the·application·master·being·the·group·leader·is·to·easily336 and·will·forward·I/O·to·the·previous·group·leader.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·purpose·of·the·application·master·being·the·group·leader·is·to·easily
337 keep·track·of·which·processes·that·belong·to·the·application.·That·is·needed337 keep·track·of·which·processes·that·belong·to·the·application.·That·is·needed
Offset 347, 55 lines modifiedOffset 347, 55 lines modified
347 defined·by·the·<code·class="inline">mod</code>·key.</p><h2·id="configuring-an-application"·class="section-heading">347 defined·by·the·<code·class="inline">mod</code>·key.</p><h2·id="configuring-an-application"·class="section-heading">
348 ··<a·href="#configuring-an-application"·class="hover-link">348 ··<a·href="#configuring-an-application"·class="hover-link">
349 ····<i·class="ri-link-m"·aria-hidden="true"></i>349 ····<i·class="ri-link-m"·aria-hidden="true"></i>
350 ··</a>350 ··</a>
351 ··<span·class="text">Configuring·an·Application</span>351 ··<span·class="text">Configuring·an·Application</span>
352 </h2>352 </h2>
353 <p>An·application·can·be·configured·using·<em>configuration·parameters</em>.·These·are·a353 <p>An·application·can·be·configured·using·<em>configuration·parameters</em>.·These·are·a
354 list·of·<code·class="inline">{Par,Val}</code>·tuples·specified·by·a·key·<code·class="inline">env</code>·in·the·<code·class="inline">.app</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4267998592-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">354 list·of·<code·class="inline">{Par,Val}</code>·tuples·specified·by·a·key·<code·class="inline">env</code>·in·the·<code·class="inline">.app</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5976493762-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">
355 ·</span><span·class="p"·data-group-id="4267998592-2">[</span><span·class="p"·data-group-id="4267998592-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="4267998592-3">}</span><span·class="p">,</span><span·class="w">355 ·</span><span·class="p"·data-group-id="5976493762-2">[</span><span·class="p"·data-group-id="5976493762-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="5976493762-3">}</span><span·class="p">,</span><span·class="w">
356 ··</span><span·class="p"·data-group-id="4267998592-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="4267998592-4">}</span><span·class="p">,</span><span·class="w">356 ··</span><span·class="p"·data-group-id="5976493762-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="5976493762-4">}</span><span·class="p">,</span><span·class="w">
357 ··</span><span·class="p"·data-group-id="4267998592-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4267998592-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·174,·SHA:·42d63ebb67e4a5e6ae18178ddedb4367b778bb3f99be29444feec61f97a07446·...·]2-5">}</span><span·class="p">,</span><span·class="w">357 ··</span><span·class="p"·data-group-id="5976493762-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5976493762-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·174,·SHA:·62678e775f8040971be95726580921c9da2338eebb6ee6487430a9a2af6fce6a·...·]2-5">}</span><span·class="p">,</span><span·class="w">
358 ··</span><span·class="p"·data-group-id="4267998592-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4267998592-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4267998592-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·21,·SHA:·9d80d03c5be5caed8c128a5790406fc0e101e2b761ceb7bd2f4e8a8a33b4c221·...·]2-7">}</span><span·class="p">,</span><span·class="w">358 ··</span><span·class="p"·data-group-id="5976493762-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5976493762-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="5976493762-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·21,·SHA:·97cd4d8ea714b4f54f694e670582a9ef565e74bcefd8c64b12491204b5ef9de5·...·]2-7">}</span><span·class="p">,</span><span·class="w">
359 ··</span><span·class="p"·data-group-id="4267998592-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4267998592-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·182,·SHA:·c87cef08ca7b76e2e2b895929e3b316afdcf1de1f7112372ec5d099393d774e7·...·]2-9">}</span><span·class="p">,</span><span·class="w">359 ··</span><span·class="p"·data-group-id="5976493762-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5976493762-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·182,·SHA:·751fddf25a42613f4520b67849bea9e41c171020b627cf3729e5e7f3995f47e4·...·]2-9">}</span><span·class="p">,</span><span·class="w">
360 ··</span><span·class="p"·data-group-id="4267998592-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4267998592-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="4267998592-13">[</s[·...·truncated·by·diffoscope;·len:·152,·SHA:·c92c814da49a888ff40a9cc4dad88a2e243456582d82a15b5c623e6d57db5c16·...·]2-11">}</span><span·class="p">,</span><span·class="w">360 ··</span><span·class="p"·data-group-id="5976493762-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5976493762-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="5976493762-13">[</s[·...·truncated·by·diffoscope;·len:·152,·SHA:·9f71eaa45bbf0f361172ea35b6a0ff6752a1c33cf3b637ae9245fd32899e5258·...·]2-11">}</span><span·class="p">,</span><span·class="w">
361 ··</span><span·class="p"·data-group-id="4267998592-14">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4267998592-15">[</span><span·class="p"·data-group-id="4267998592-16">{</span><span·class="ss">file</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·223,·SHA:·6bb95b6b6dc73daa7192d440c20e7adab0772ff66935dbcf13d68d32590d7379·...·]2-14">}</span><span·class="w">361 ··</span><span·class="p"·data-group-id="5976493762-14">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5976493762-15">[</span><span·class="p"·data-group-id="5976493762-16">{</span><span·class="ss">file</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·223,·SHA:·1aec49616eff46a950fea7258b008a2040440614001754d005de1a3e5d009981·...·]2-14">}</span><span·class="w">
362 ·</span><span·class="p"·data-group-id="4267998592-2">]</span><span·class="p"·data-group-id="4267998592-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">Par</code>·is·to·be·an·atom.·<code·class="inline">Val</code>·is·any·term.·The·application·can·retrieve·the362 ·</span><span·class="p"·data-group-id="5976493762-2">]</span><span·class="p"·data-group-id="5976493762-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">Par</code>·is·to·be·an·atom.·<code·class="inline">Val</code>·is·any·term.·The·application·can·retrieve·the
363 value·of·a·configuration·parameter·by·calling·<code·class="inline">application:get_env(App,·Par)</code>·or363 value·of·a·configuration·parameter·by·calling·<code·class="inline">application:get_env(App,·Par)</code>·or
364 a·number·of·similar·functions.·For·more·information,·see·module·<a·href="../../lib/kernel-10.2.6/doc/html/application.html"><code·class="inline">application</code></a>364 a·number·of·similar·functions.·For·more·information,·see·module·<a·href="../../lib/kernel-10.2.6/doc/html/application.html"><code·class="inline">application</code></a>
365 in·Kernel.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl</span><span·class="w">365 in·Kernel.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl</span><span·class="w">
366 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="7578301258-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="7578301258-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·415,·SHA:·31b66b5a1efd20e03c60b54b74bff4de7ac10205a8e3cee053421029836fb462·...·]-3">]</span><span·class="w">366 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="2657309435-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="2657309435-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·415,·SHA:·26f6d4e9ef7735e071be92bc69bdfb518d339d92e0aae53f7c84c3a93fb3594f·...·]-3">]</span><span·class="w">
  
367 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">2.3</span><span·class="p">.</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="7578301258-4">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7578301258-4">)</span><span·class="gp·unselectable">367 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">2.3</span><span·class="p">.</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="2657309435-4">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="2657309435-4">)</span><span·class="gp·unselectable">
368 1&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="7578301258-5">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="7578301258-5">)</span><span·class="p">.</span><span·class="w">368 1&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2657309435-5">(</span><span·class="ss">ch_app</span><span·class="p"·data-group-id="2657309435-5">)</span><span·class="p">.</span><span·class="w">
369 </span><span·class="ss">ok</span><span·class="gp·unselectable">369 </span><span·class="ss">ok</span><span·class="gp·unselectable">
370 2&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">get_env</span><span·class="p"·data-group-id="7578301258-6">(</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file</span><span·class="p"·data-group-id="7578301258-6">)</span><span·class="p">.</span><span·class="w">370 2&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">get_env</span><span·class="p"·data-group-id="2657309435-6">(</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file</span><span·class="p"·data-group-id="2657309435-6">)</span><span·class="p">.</span><span·class="w">
371 </span><span·class="p"·data-group-id="7578301258-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="s">&quot;/usr/local/log&quot;</span><span·class="p"·data-group-id="7578301258-7">}</span></code></pre><p>The·values·in·the·<code·class="inline">.app</code>·file·can·be·overridden·by·values·in·a·<em>system371 </span><span·class="p"·data-group-id="2657309435-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="s">&quot;/usr/local/log&quot;</span><span·class="p"·data-group-id="2657309435-7">}</span></code></pre><p>The·values·in·the·<code·class="inline">.app</code>·file·can·be·overridden·by·values·in·a·<em>system
372 configuration·file</em>.·This·is·a·file·that·contains·configuration·parameters·for372 configuration·file</em>.·This·is·a·file·that·contains·configuration·parameters·for
373 relevant·applications:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3770946853-1">[</span><span·class="p"·data-group-id="3770946853-2">{</span><span·class="n">Application1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3770946853-3">[</span><span·class="p"·data-group-id="3770946853-4">[·...·truncated·by·diffoscope;·len:·331,·SHA:·7b8e19d1f2f8db9ff01bd68048d0ebb5617d381fbbc020ddf711968bc447632a·...·]-2">}</span><span·class="p">,</span><span·class="w">373 relevant·applications:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6208409371-1">[</span><span·class="p"·data-group-id="6208409371-2">{</span><span·class="n">Application1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6208409371-3">[</span><span·class="p"·data-group-id="6208409371-4">[·...·truncated·by·diffoscope;·len:·331,·SHA:·84d7a7f4c47b0da7de6c998b2ddcaa8f3787d0297b513b99344c9583a3e949ff·...·]-2">}</span><span·class="p">,</span><span·class="w">
374 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">374 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">
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120 ··<a·href="#changing-a-functional-module"·class="hover-link">120 ··<a·href="#changing-a-functional-module"·class="hover-link">
121 ····<i·class="ri-link-m"·aria-hidden="true"></i>121 ····<i·class="ri-link-m"·aria-hidden="true"></i>
122 ··</a>122 ··</a>
123 ··<span·class="text">Changing·a·Functional·Module</span>123 ··<span·class="text">Changing·a·Functional·Module</span>
124 </h2>124 </h2>
125 <p>When·a·functional·module·has·been·changed,·for·example,·if·a·new·function·has125 <p>When·a·functional·module·has·been·changed,·for·example,·if·a·new·function·has
126 been·added·or·a·bug·has·been·corrected,·simple·code·replacement·is·sufficient,126 been·added·or·a·bug·has·been·corrected,·simple·code·replacement·is·sufficient,
127 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1046460900-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">127 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3002531564-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
128 ·</span><span·class="p"·data-group-id="1046460900-2">[</span><span·class="p"·data-group-id="1046460900-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1046460900-4">[</span><span·class="p"·data-group-id="1046460900-5"[·...·truncated·by·diffoscope;·len:·317,·SHA:·2e5a0d3375619aec7073e992acd91738329da876e27417941247be7f50bbacd2·...·]-2">]</span><span·class="p">,</span><span·class="w">128 ·</span><span·class="p"·data-group-id="3002531564-2">[</span><span·class="p"·data-group-id="3002531564-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3002531564-4">[</span><span·class="p"·data-group-id="3002531564-5"[·...·truncated·by·diffoscope;·len:·317,·SHA:·6f088b4e254f23aa729e8353499a040013addded667be58564e97d347f96981c·...·]-2">]</span><span·class="p">,</span><span·class="w">
129 ·</span><span·class="p"·data-group-id="1046460900-6">[</span><span·class="p"·data-group-id="1046460900-7">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1046460900-8">[</span><span·class="p"·data-group-id="1046460900-9"[·...·truncated·by·diffoscope;·len:·317,·SHA:·fbff84a745a8f55fda06098c7d7477407f59e626f91fc4b4867e57fbe0d30d59·...·]-6">]</span><span·class="w">129 ·</span><span·class="p"·data-group-id="3002531564-6">[</span><span·class="p"·data-group-id="3002531564-7">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3002531564-8">[</span><span·class="p"·data-group-id="3002531564-9"[·...·truncated·by·diffoscope;·len:·317,·SHA:·3b762ac36529de16f5380cb4a3921496e611bce9b8469b5fc9af0958e645d7f7·...·]-6">]</span><span·class="w">
130 </span><span·class="p"·data-group-id="1046460900-1">}</span><span·class="p">.</span></code></pre><h2·id="changing-a-residence-module"·class="section-heading">130 </span><span·class="p"·data-group-id="3002531564-1">}</span><span·class="p">.</span></code></pre><h2·id="changing-a-residence-module"·class="section-heading">
131 ··<a·href="#changing-a-residence-module"·class="hover-link">131 ··<a·href="#changing-a-residence-module"·class="hover-link">
132 ····<i·class="ri-link-m"·aria-hidden="true"></i>132 ····<i·class="ri-link-m"·aria-hidden="true"></i>
133 ··</a>133 ··</a>
134 ··<span·class="text">Changing·a·Residence·Module</span>134 ··<span·class="text">Changing·a·Residence·Module</span>
135 </h2>135 </h2>
136 <p>In·a·system·implemented·according·to·the·OTP·design·principles,·all·processes,136 <p>In·a·system·implemented·according·to·the·OTP·design·principles,·all·processes,
137 except·system·processes·and·special·processes,·reside·in·one·of·the·behaviours137 except·system·processes·and·special·processes,·reside·in·one·of·the·behaviours
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142 ··<a·href="#changing-a-callback-module"·class="hover-link">142 ··<a·href="#changing-a-callback-module"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
144 ··</a>144 ··</a>
145 ··<span·class="text">Changing·a·Callback·Module</span>145 ··<span·class="text">Changing·a·Callback·Module</span>
146 </h2>146 </h2>
147 <p>A·callback·module·is·a·functional·module,·and·for·code·extensions·simple·code147 <p>A·callback·module·is·a·functional·module,·and·for·code·extensions·simple·code
148 replacement·is·sufficient.</p><p><em>Example</em></p><p>When·adding·a·function·to·<code·class="inline">ch3</code>,·as·described·in·the·example·in148 replacement·is·sufficient.</p><p><em>Example</em></p><p>When·adding·a·function·to·<code·class="inline">ch3</code>,·as·described·in·the·example·in
149 <a·href="release_handling.html#appup">Release·Handling</a>,·<code·class="inline">ch_app.appup</code>·looks·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7363272329-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">149 <a·href="release_handling.html#appup">Release·Handling</a>,·<code·class="inline">ch_app.appup</code>·looks·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1709795169-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
150 ·</span><span·class="p"·data-group-id="7363272329-2">[</span><span·class="p"·data-group-id="7363272329-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7363272329-4">[</span><span·class="p"·data-group-id="7363272329-5"[·...·truncated·by·diffoscope;·len:·318,·SHA:·15c985116e982b8f4c61caa525123bff5303096162f77700451c04bdc74a57d9·...·]9-2">]</span><span·class="p">,</span><span·class="w">150 ·</span><span·class="p"·data-group-id="1709795169-2">[</span><span·class="p"·data-group-id="1709795169-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1709795169-4">[</span><span·class="p"·data-group-id="1709795169-5"[·...·truncated·by·diffoscope;·len:·318,·SHA:·213dc8d995d37ea66f81a035a3fef377a658e1e4ceb745311cab4e4ff24cde5d·...·]9-2">]</span><span·class="p">,</span><span·class="w">
151 ·</span><span·class="p"·data-group-id="7363272329-6">[</span><span·class="p"·data-group-id="7363272329-7">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7363272329-8">[</span><span·class="p"·data-group-id="7363272329-9"[·...·truncated·by·diffoscope;·len:·318,·SHA:·d2cda061a747d80d0fc4c7cd5a494b9841349ba75640dba56bd731f81e712b35·...·]9-6">]</span><span·class="w">151 ·</span><span·class="p"·data-group-id="1709795169-6">[</span><span·class="p"·data-group-id="1709795169-7">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1709795169-8">[</span><span·class="p"·data-group-id="1709795169-9"[·...·truncated·by·diffoscope;·len:·318,·SHA:·98b2c6033f9c01969e963b6236ea67c15fbbae04207b8cb4d82ad608445a6c9d·...·]9-6">]</span><span·class="w">
152 </span><span·class="p"·data-group-id="7363272329-1">}</span><span·class="p">.</span></code></pre><p>OTP·also·supports·changing·the·internal·state·of·behaviour·processes;·see152 </span><span·class="p"·data-group-id="1709795169-1">}</span><span·class="p">.</span></code></pre><p>OTP·also·supports·changing·the·internal·state·of·behaviour·processes;·see
153 <a·href="appup_cookbook.html#int_state">Changing·Internal·State</a>.</p><p><a·href=""·id="int_state"></a></p><h2·id="changing-internal-state"·class="section-heading">153 <a·href="appup_cookbook.html#int_state">Changing·Internal·State</a>.</p><p><a·href=""·id="int_state"></a></p><h2·id="changing-internal-state"·class="section-heading">
154 ··<a·href="#changing-internal-state"·class="hover-link">154 ··<a·href="#changing-internal-state"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">Changing·Internal·State</span>157 ··<span·class="text">Changing·Internal·State</span>
158 </h2>158 </h2>
159 <p>In·this·case,·simple·code·replacement·is·not·sufficient.·The·process·must159 <p>In·this·case,·simple·code·replacement·is·not·sufficient.·The·process·must
160 explicitly·transform·its·state·using·the·callback·function·<code·class="inline">code_change/3</code>·before160 explicitly·transform·its·state·using·the·callback·function·<code·class="inline">code_change/3</code>·before
161 switching·to·the·new·version·of·the·callback·module.·Thus,·synchronized·code161 switching·to·the·new·version·of·the·callback·module.·Thus,·synchronized·code
162 replacement·is·used.</p><p><em>Example</em></p><p>Consider·the·<code·class="inline">ch3</code>·module·from162 replacement·is·used.</p><p><em>Example</em></p><p>Consider·the·<code·class="inline">ch3</code>·module·from
163 <a·href="gen_server_concepts.html#ex">gen_server·Behaviour</a>.·The·internal·state·is·a·term163 <a·href="gen_server_concepts.html#ex">gen_server·Behaviour</a>.·The·internal·state·is·a·term
164 <code·class="inline">Chs</code>·representing·the·available·channels.·Assume·you·want·to·add·a·counter·<code·class="inline">N</code>,164 <code·class="inline">Chs</code>·representing·the·available·channels.·Assume·you·want·to·add·a·counter·<code·class="inline">N</code>,
165 which·keeps·track·of·the·number·of·<code·class="inline">alloc</code>·requests·so·far.·This·means·that·the165 which·keeps·track·of·the·number·of·<code·class="inline">alloc</code>·requests·so·far.·This·means·that·the
166 format·must·be·changed·to·<code·class="inline">{Chs,N}</code>.</p><p>The·<code·class="inline">.appup</code>·file·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5235862982-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">166 format·must·be·changed·to·<code·class="inline">{Chs,N}</code>.</p><p>The·<code·class="inline">.appup</code>·file·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3460591255-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
167 ·</span><span·class="p"·data-group-id="5235862982-2">[</span><span·class="p"·data-group-id="5235862982-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5235862982-4">[</span><span·class="p"·data-group-id="5235862982-5"[·...·truncated·by·diffoscope;·len:·654,·SHA:·b385fd81dfd9dbf5db897726f5f11efd448c2613dd356833912ae2df20f72d69·...·]-2">]</span><span·class="p">,</span><span·class="w">167 ·</span><span·class="p"·data-group-id="3460591255-2">[</span><span·class="p"·data-group-id="3460591255-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3460591255-4">[</span><span·class="p"·data-group-id="3460591255-5"[·...·truncated·by·diffoscope;·len:·654,·SHA:·b901ebb5d837bf67994883caa54638066f6a32d21f121fdbb4a7b78b4f5584ac·...·]-2">]</span><span·class="p">,</span><span·class="w">
168 ·</span><span·class="p"·data-group-id="5235862982-8">[</span><span·class="p"·data-group-id="5235862982-9">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5235862982-10">[</span><span·class="p"·data-group-id="5235862982-1[·...·truncated·by·diffoscope;·len:·662,·SHA:·218ffea1a35479b8397ee2382454745b4ee305147bdf666d1f8f3aed8b1364db·...·]-8">]</span><span·class="w">168 ·</span><span·class="p"·data-group-id="3460591255-8">[</span><span·class="p"·data-group-id="3460591255-9">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3460591255-10">[</span><span·class="p"·data-group-id="3460591255-1[·...·truncated·by·diffoscope;·len:·662,·SHA:·e37b70955abeb8579a4d1e047ecee40340fb512cf67fb7b4a84aa15174567b8b·...·]-8">]</span><span·class="w">
169 </span><span·class="p"·data-group-id="5235862982-1">}</span><span·class="p">.</span></code></pre><p>The·third·element·of·the·<code·class="inline">update</code>·instruction·is·a·tuple·<code·class="inline">{advanced,Extra}</code>,169 </span><span·class="p"·data-group-id="3460591255-1">}</span><span·class="p">.</span></code></pre><p>The·third·element·of·the·<code·class="inline">update</code>·instruction·is·a·tuple·<code·class="inline">{advanced,Extra}</code>,
170 which·says·that·the·affected·processes·are·to·do·a·state·transformation·before170 which·says·that·the·affected·processes·are·to·do·a·state·transformation·before
171 loading·the·new·version·of·the·module.·This·is·done·by·the·processes·calling·the171 loading·the·new·version·of·the·module.·This·is·done·by·the·processes·calling·the
172 callback·function·<code·class="inline">code_change/3</code>·(see·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>·in·STDLIB).172 callback·function·<code·class="inline">code_change/3</code>·(see·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>·in·STDLIB).
173 The·term·<code·class="inline">Extra</code>,·in·this·case·<code·class="inline">[]</code>,·is·passed·as·is·to·the·function:</p><p><a·href=""·id="code_change"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4675180293-1">(</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4675180293-1">)</span><span·class="p">.</span><span·class="w">173 The·term·<code·class="inline">Extra</code>,·in·this·case·<code·class="inline">[]</code>,·is·passed·as·is·to·the·function:</p><p><a·href=""·id="code_change"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0367370445-1">(</span><span·class="ss">ch3</span><span·class="p"·data-group-id="0367370445-1">)</span><span·class="p">.</span><span·class="w">
174 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">174 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
175 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4675180293-2">(</span><span·class="p"·data-group-id="4675180293-3">[</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">3</span><span·class="p"·data-group-id="4675180293-3">]</span><span·class="p"·data-group-id="4675180293-2">)</span><span·class="p">.</span><span·class="w">175 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0367370445-2">(</span><span·class="p"·data-group-id="0367370445-3">[</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">3</span><span·class="p"·data-group-id="0367370445-3">]</span><span·class="p"·data-group-id="0367370445-2">)</span><span·class="p">.</span><span·class="w">
176 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">176 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
177 </span><span·class="nf">code_change</span><span·class="p"·data-group-id="4675180293-4">(</span><span·class="p"·data-group-id="4675180293-5">{</span><span·class="ss">down</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Vsn</span><span·class="p"·data-group-id="4675180293-5">}</span><s[·...·truncated·by·diffoscope;·len:·391,·SHA:·e88a4fe456bf4bdd8c7fc73e4a0b7bac582b259e2d4b239ab2a50f564bb35af1·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">177 </span><span·class="nf">code_change</span><span·class="p"·data-group-id="0367370445-4">(</span><span·class="p"·data-group-id="0367370445-5">{</span><span·class="ss">down</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Vsn</span><span·class="p"·data-group-id="0367370445-5">}</span><s[·...·truncated·by·diffoscope;·len:·391,·SHA:·cf3ebc6f9040718f7e7ebf924b6b6c77e7026a4f3ac80a1a59e9f4ffed582953·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
178 ····</span><span·class="p"·data-group-id="4675180293-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="4675180293-7">}</span><span·class="p">;</span><span·class="w">178 ····</span><span·class="p"·data-group-id="0367370445-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="0367370445-7">}</span><span·class="p">;</span><span·class="w">
179 </span><span·class="nf">code_change</span><span·class="p"·data-group-id="4675180293-8">(</span><span·class="p">_</span><span·class="n">Vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Extra</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·0ffdd2ae114b2e4403597171099ddcda8e2f0c2351e955d315d4f656c6812d80·...·]-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">179 </span><span·class="nf">code_change</span><span·class="p"·data-group-id="0367370445-8">(</span><span·class="p">_</span><span·class="n">Vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Extra</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·c3b6d213379e82f58ed39c378c36265d16e357df2d8e12b9b24b9f21ab3ab977·...·]-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
180 ····</span><span·class="p"·data-group-id="4675180293-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4675180293-10">{</span><span·class="n">Chs</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·c[·...·truncated·by·diffoscope;·len:·88,·SHA:·a3f1896cf2619c8b37d54c77558378a59283ede23591a30b19d6b6c749a5f5b4·...·]-9">}</span><span·class="p">.</span></code></pre><p>The·first·argument·is·<code·class="inline">{down,Vsn}</code>·if·there·is·a·downgrade,·or·<code·class="inline">Vsn</code>·if·there·is180 ····</span><span·class="p"·data-group-id="0367370445-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0367370445-10">{</span><span·class="n">Chs</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·c[·...·truncated·by·diffoscope;·len:·88,·SHA:·aa654552cfc77fd4418f375c2e3442b5f24690cb3f9e9badb423a883ab32ef89·...·]-9">}</span><span·class="p">.</span></code></pre><p>The·first·argument·is·<code·class="inline">{down,Vsn}</code>·if·there·is·a·downgrade,·or·<code·class="inline">Vsn</code>·if·there·is
181 a·upgrade.·The·term·<code·class="inline">Vsn</code>·is·fetched·from·the·'original'·version·of·the·module,181 a·upgrade.·The·term·<code·class="inline">Vsn</code>·is·fetched·from·the·'original'·version·of·the·module,
182 that·is,·the·version·you·are·upgrading·from,·or·downgrading·to.</p><p>The·version·is·defined·by·the·module·attribute·<code·class="inline">vsn</code>,·if·any.·There·is·no·such182 that·is,·the·version·you·are·upgrading·from,·or·downgrading·to.</p><p>The·version·is·defined·by·the·module·attribute·<code·class="inline">vsn</code>,·if·any.·There·is·no·such
183 attribute·in·<code·class="inline">ch3</code>,·so·in·this·case·the·version·is·the·checksum·(a·huge·integer)183 attribute·in·<code·class="inline">ch3</code>,·so·in·this·case·the·version·is·the·checksum·(a·huge·integer)
184 of·the·beam·file,·an·uninteresting·value,·which·is·ignored.</p><p>The·other·callback·functions·of·<code·class="inline">ch3</code>·must·also·be·modified·and·perhaps·a·new184 of·the·beam·file,·an·uninteresting·value,·which·is·ignored.</p><p>The·other·callback·functions·of·<code·class="inline">ch3</code>·must·also·be·modified·and·perhaps·a·new
185 interface·function·must·be·added,·but·this·is·not·shown·here.</p><h2·id="module-dependencies"·class="section-heading">185 interface·function·must·be·added,·but·this·is·not·shown·here.</p><h2·id="module-dependencies"·class="section-heading">
186 ··<a·href="#module-dependencies"·class="hover-link">186 ··<a·href="#module-dependencies"·class="hover-link">
187 ····<i·class="ri-link-m"·aria-hidden="true"></i>187 ····<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 190, 67 lines modifiedOffset 190, 67 lines modified
190 </h2>190 </h2>
191 <p>Assume·that·a·module·is·extended·by·adding·an·interface·function,·as·in·the191 <p>Assume·that·a·module·is·extended·by·adding·an·interface·function,·as·in·the
192 example·in·<a·href="release_handling.html#appup">Release·Handling</a>,·where·a·function192 example·in·<a·href="release_handling.html#appup">Release·Handling</a>,·where·a·function
193 <code·class="inline">available/0</code>·is·added·to·<code·class="inline">ch3</code>.</p><p>If·a·call·is·added·to·this·function,·say·in·module·<code·class="inline">m1</code>,·a·runtime·error·could193 <code·class="inline">available/0</code>·is·added·to·<code·class="inline">ch3</code>.</p><p>If·a·call·is·added·to·this·function,·say·in·module·<code·class="inline">m1</code>,·a·runtime·error·could
194 can·occur·during·release·upgrade·if·the·new·version·of·<code·class="inline">m1</code>·is·loaded·first·and194 can·occur·during·release·upgrade·if·the·new·version·of·<code·class="inline">m1</code>·is·loaded·first·and
195 calls·<code·class="inline">ch3:available/0</code>·before·the·new·version·of·<code·class="inline">ch3</code>·is·loaded.</p><p>Thus,·<code·class="inline">ch3</code>·must·be·loaded·before·<code·class="inline">m1</code>,·in·the·upgrade·case,·and·conversely·in195 calls·<code·class="inline">ch3:available/0</code>·before·the·new·version·of·<code·class="inline">ch3</code>·is·loaded.</p><p>Thus,·<code·class="inline">ch3</code>·must·be·loaded·before·<code·class="inline">m1</code>,·in·the·upgrade·case,·and·conversely·in
196 the·downgrade·case.·<code·class="inline">m1</code>·is·said·to·be·<em>dependent·on</em>·<code·class="inline">ch3</code>.·In·a·release196 the·downgrade·case.·<code·class="inline">m1</code>·is·said·to·be·<em>dependent·on</em>·<code·class="inline">ch3</code>.·In·a·release
197 handling·instruction,·this·is·expressed·by·the·<code·class="inline">DepMods</code>·element:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0251693825-1">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="0251693825-1">}</span><span·class="w">197 handling·instruction,·this·is·expressed·by·the·<code·class="inline">DepMods</code>·element:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0079128366-1">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="0079128366-1">}</span><span·class="w">
198 </span><span·class="p"·data-group-id="0251693825-2">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0251693825-3">{</span><span·class="ss">advanced</[·...·truncated·by·diffoscope;·len:·253,·SHA:·c455e7c738ee358b24dd2cf9993fe8174482381465152e49fe2a7de8d80470a5·...·]-2">}</span></code></pre><p><code·class="inline">DepMods</code>·is·a·list·of·modules,·on·which·<code·class="inline">Module</code>·is·dependent.</p><p><em>Example</em></p><p>The·module·<code·class="inline">m1</code>·in·application·<code·class="inline">myapp</code>·is·dependent·on·<code·class="inline">ch3</code>·when198 </span><span·class="p"·data-group-id="0079128366-2">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0079128366-3">{</span><span·class="ss">advanced</[·...·truncated·by·diffoscope;·len:·253,·SHA:·c3db5dac7e25cf24c92d763f327ec8c3c0e24f77dc4f5d5d47b44b6a61fae49f·...·]-2">}</span></code></pre><p><code·class="inline">DepMods</code>·is·a·list·of·modules,·on·which·<code·class="inline">Module</code>·is·dependent.</p><p><em>Example</em></p><p>The·module·<code·class="inline">m1</code>·in·application·<code·class="inline">myapp</code>·is·dependent·on·<code·class="inline">ch3</code>·when
199 upgrading·from·&quot;1&quot;·to·&quot;2&quot;,·or·downgrading·from·&quot;2&quot;·to·&quot;1&quot;:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">myapp</span><span·class="p">.</span><span·class="nc">appup</span><span·class="p">:</span><span·class="w">199 upgrading·from·&quot;1&quot;·to·&quot;2&quot;,·or·downgrading·from·&quot;2&quot;·to·&quot;1&quot;:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">myapp</span><span·class="p">.</span><span·class="nc">appup</span><span·class="p">:</span><span·class="w">
  
200 </span><span·class="p"·data-group-id="3232599702-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">200 </span><span·class="p"·data-group-id="7870157202-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
201 ·</span><span·class="p"·data-group-id="3232599702-2">[</span><span·class="p"·data-group-id="3232599702-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3232599702-4">[</span><span·class="p"·data-group-id="3232599702-5"[·...·truncated·by·diffoscope;·len:·497,·SHA:·3edc58efda54bba59a8251e30308d00ea3006df85866e05c9bffdbabfb712cae·...·]02-2">]</span><span·class="p">,</span><span·class="w">201 ·</span><span·class="p"·data-group-id="7870157202-2">[</span><span·class="p"·data-group-id="7870157202-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870157202-4">[</span><span·class="p"·data-group-id="7870157202-5"[·...·truncated·by·diffoscope;·len:·497,·SHA:·34b5a586be6bb0ebf2e1d9a04489000001d50406c32a82b4e452d54a6bf8e350·...·]02-2">]</span><span·class="p">,</span><span·class="w">
202 ·</span><span·class="p"·data-group-id="3232599702-7">[</span><span·class="p"·data-group-id="3232599702-8">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3232599702-9">[</span><span·class="p"·data-group-id="3232599702-10[·...·truncated·by·diffoscope;·len:·501,·SHA:·496321c3a03eadacaf978c4d2becb5f934340d8ebca8f9c3291ca38f2177e65c·...·]02-7">]</span><span·class="w">202 ·</span><span·class="p"·data-group-id="7870157202-7">[</span><span·class="p"·data-group-id="7870157202-8">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870157202-9">[</span><span·class="p"·data-group-id="7870157202-10[·...·truncated·by·diffoscope;·len:·501,·SHA:·e71079bf99ee04561ce857fd66e50ec1ef09d4d72813e584b724d4af7589b7d2·...·]02-7">]</span><span·class="w">
203 </span><span·class="p"·data-group-id="3232599702-1">}</span><span·class="p">.</span><span·class="w">203 </span><span·class="p"·data-group-id="7870157202-1">}</span><span·class="p">.</span><span·class="w">
  
204 </span><span·class="ss">ch_app</span><span·class="p">.</span><span·class="nc">appup</span><span·class="p">:</span><span·class="w">204 </span><span·class="ss">ch_app</span><span·class="p">.</span><span·class="nc">appup</span><span·class="p">:</span><span·class="w">
  
205 </span><span·class="p"·data-group-id="3232599702-12">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">205 </span><span·class="p"·data-group-id="7870157202-12">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
206 ·</span><span·class="p"·data-group-id="3232599702-13">[</span><span·class="p"·data-group-id="3232599702-14">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3232599702-15">[</span><span·class="p"·data-group-id="3232599702-16">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3232599702-16">}</span><span·class="p"·data-group-id="3232599702-15">]</span><span·class="p"·data-group-id="3232599702-14">}</span><span·class="p"·data-group-id="3232599702-13">]</span><span·class="p">,</span><span·class="w"> 
207 ·</span><span·class="p"·data-group-id="3232599702-17">[</span><span·class="p"·data-group-id="3232599702-18">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3232599702-19">[</span><span·class="p"·data-group-id="3232599702[·...·truncated·by·diffoscope;·len:·332,·SHA:·a39284e8d0a55e545ce7638780c889426334f053b5b2a5238194768b001d079e·...·]</span><span·class="w">206 ·</span><span·class="p"·data-group-id="7870157202-13">[</span><span·class="p"·data-group-id="7870157202-14">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870157202-15">[</span><span·class="p"·data-group-id="7870157202[·...·truncated·by·diffoscope;·len:·356,·SHA:·82a6ad37588a0acc5162e5626ad1d8b8a5802a3c961814169f67242e4ce8d274·...·]</span><span·class="w">
 207 ·</span><span·class="p"·data-group-id="7870157202-17">[</span><span·class="p"·data-group-id="7870157202-18">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870157202-19">[</span><span·class="p"·data-group-id="7870157202-20">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="7870157202-20">}</span><span·class="p"·data-group-id="7870157202-19">]</span><span·class="p"·data-group-id="7870157202-18">}</span><span·class="p"·data-group-id="7870157202-17">]</span><span·class="w">
208 </span><span·class="p"·data-group-id="3232599702-12">}</span><span·class="p">.</span></code></pre><p>If·instead·<code·class="inline">m1</code>·and·<code·class="inline">ch3</code>·belong·to·the·same·application,·the·<code·class="inline">.appup</code>·file·can208 </span><span·class="p"·data-group-id="7870157202-12">}</span><span·class="p">.</span></code></pre><p>If·instead·<code·class="inline">m1</code>·and·<code·class="inline">ch3</code>·belong·to·the·same·application,·the·<code·class="inline">.appup</code>·file·can
209 look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0711901294-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">209 look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4061818189-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
210 ·</span><span·class="p"·data-group-id="0711901294-2">[</span><span·class="p"·data-group-id="0711901294-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">210 ·</span><span·class="p"·data-group-id="4061818189-2">[</span><span·class="p"·data-group-id="4061818189-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">
211 ···</span><span·class="p"·data-group-id="0711901294-4">[</span><span·class="p"·data-group-id="0711901294-5">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="0711901294-5">}</span><span·class="p">,</span><span·class="w">211 ···</span><span·class="p"·data-group-id="4061818189-4">[</span><span·class="p"·data-group-id="4061818189-5">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4061818189-5">}</span><span·class="p">,</span><span·class="w">
212 ····</span><span·class="p"·data-group-id="0711901294-6">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">m1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0711901294-7">[</span><span·class="ss">ch3</sp[·...·truncated·by·diffoscope;·len:·256,·SHA:·a53b78d9f19460729b6d6a8511709bd44acf9a7bd1fa1abc867c8ed3882b395c·...·]-2">]</span><span·class="p">,</span><span·class="w">212 ····</span><span·class="p"·data-group-id="4061818189-6">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">m1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4061818189-7">[</span><span·class="ss">ch3</sp[·...·truncated·by·diffoscope;·len:·256,·SHA:·9fd4a3b546745b3d76bb8a8a68130a59e9fdd861680a102cb78941197c5db99a·...·]-2">]</span><span·class="p">,</span><span·class="w">
213 ·</span><span·class="p"·data-group-id="0711901294-8">[</span><span·class="p"·data-group-id="0711901294-9">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">213 ·</span><span·class="p"·data-group-id="4061818189-8">[</span><span·class="p"·data-group-id="4061818189-9">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">
214 ···</span><span·class="p"·data-group-id="0711901294-10">[</span><span·class="p"·data-group-id="0711901294-11">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="0711901294-11">}</span><span·class="p">,</span><span·class="w">214 ···</span><span·class="p"·data-group-id="4061818189-10">[</span><span·class="p"·data-group-id="4061818189-11">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4061818189-11">}</span><span·class="p">,</span><span·class="w">
215 ····</span><span·class="p"·data-group-id="0711901294-12">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">m1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0711901294-13">[</span><span·class="ss">ch3</[·...·truncated·by·diffoscope;·len:·261,·SHA:·88511735402da034b903f7f710bea148f2b9c681fc991735fca878bd903dd8ae·...·]-8">]</span><span·class="w">215 ····</span><span·class="p"·data-group-id="4061818189-12">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">m1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4061818189-13">[</span><span·class="ss">ch3</[·...·truncated·by·diffoscope;·len:·261,·SHA:·cf795f5c0a8b6ba8cac54b9de6f26ddad7c063317f5691bfed8864b0566b83df·...·]-8">]</span><span·class="w">
216 </span><span·class="p"·data-group-id="0711901294-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">m1</code>·is·dependent·on·<code·class="inline">ch3</code>·also·when·downgrading.·<code·class="inline">systools</code>·knows·the216 </span><span·class="p"·data-group-id="4061818189-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">m1</code>·is·dependent·on·<code·class="inline">ch3</code>·also·when·downgrading.·<code·class="inline">systools</code>·knows·the
217 difference·between·up-·and·downgrading·and·generates·a·correct·<code·class="inline">relup</code>,·where217 difference·between·up-·and·downgrading·and·generates·a·correct·<code·class="inline">relup</code>,·where
218 <code·class="inline">ch3</code>·is·loaded·before·<code·class="inline">m1</code>·when·upgrading,·but·<code·class="inline">m1</code>·is·loaded·before·<code·class="inline">ch3</code>·when218 <code·class="inline">ch3</code>·is·loaded·before·<code·class="inline">m1</code>·when·upgrading,·but·<code·class="inline">m1</code>·is·loaded·before·<code·class="inline">ch3</code>·when
219 downgrading.</p><p><a·href=""·id="spec"></a></p><h2·id="changing-code-for-a-special-process"·class="section-heading">219 downgrading.</p><p><a·href=""·id="spec"></a></p><h2·id="changing-code-for-a-special-process"·class="section-heading">
220 ··<a·href="#changing-code-for-a-special-process"·class="hover-link">220 ··<a·href="#changing-code-for-a-special-process"·class="hover-link">
221 ····<i·class="ri-link-m"·aria-hidden="true"></i>221 ····<i·class="ri-link-m"·aria-hidden="true"></i>
222 ··</a>222 ··</a>
223 ··<span·class="text">Changing·Code·for·a·Special·Process</span>223 ··<span·class="text">Changing·Code·for·a·Special·Process</span>
224 </h2>224 </h2>
225 <p>In·this·case,·simple·code·replacement·is·not·sufficient.·When·a·new·version·of·a225 <p>In·this·case,·simple·code·replacement·is·not·sufficient.·When·a·new·version·of·a
226 residence·module·for·a·special·process·is·loaded,·the·process·must·make·a·fully226 residence·module·for·a·special·process·is·loaded,·the·process·must·make·a·fully
227 qualified·call·to·its·loop·function·to·switch·to·the·new·code.·Thus,227 qualified·call·to·its·loop·function·to·switch·to·the·new·code.·Thus,
228 synchronized·code·replacement·must·be·used.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·name(s)·of·the·user-defined·residence·module(s)·must·be·listed·in·the228 synchronized·code·replacement·must·be·used.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·name(s)·of·the·user-defined·residence·module(s)·must·be·listed·in·the
229 <code·class="inline">Modules</code>·part·of·the·child·specification·for·the·special·process.·Otherwise229 <code·class="inline">Modules</code>·part·of·the·child·specification·for·the·special·process.·Otherwise
230 the·release·handler·cannot·find·the·process.</p></section><p><em>Example</em></p><p>Consider·the·example·<code·class="inline">ch4</code>·in·<a·href="spec_proc.html#ex">sys·and·proc_lib</a>.230 the·release·handler·cannot·find·the·process.</p></section><p><em>Example</em></p><p>Consider·the·example·<code·class="inline">ch4</code>·in·<a·href="spec_proc.html#ex">sys·and·proc_lib</a>.
231 When·started·by·a·supervisor,·the·child·specification·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4562335152-1">{</span><span·class="ss">ch4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4562335152-2">{</span><span·class="ss">ch4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</sp[·...·truncated·by·diffoscope;·len:·198,·SHA:·81f4fe251188ca6c9f83ca077c12a864834d0f30abc09f92334a16b552d009c6·...·]-2">}</span><span·class="p">,</span><span·class="w">231 When·started·by·a·supervisor,·the·child·specification·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8379319233-1">{</span><span·class="ss">ch4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8379319233-2">{</span><span·class="ss">ch4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</sp[·...·truncated·by·diffoscope;·len:·198,·SHA:·f9bbec477fb9501b4af2a9c0ca8582b492b3a519dd6572adb728daa4dd28d05f·...·]-2">}</span><span·class="p">,</span><span·class="w">
232 ·</span><span·class="ss">permanent</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">worker</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4562335152-4">[</span><span·class="ss">ch4</span><span·class="p"·data-group-id="4562335152-4">]</span><span·class="p"·data-group-id="4562335152-1">}</span></code></pre><p>If·<code·class="inline">ch4</code>·is·part·of·the·application·<code·class="inline">sp_app</code>·and·a·new·version·of·the·module·is232 ·</span><span·class="ss">permanent</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">worker</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8379319233-4">[</span><span·class="ss">ch4</span><span·class="p"·data-group-id="8379319233-4">]</span><span·class="p"·data-group-id="8379319233-1">}</span></code></pre><p>If·<code·class="inline">ch4</code>·is·part·of·the·application·<code·class="inline">sp_app</code>·and·a·new·version·of·the·module·is
233 to·be·loaded·when·upgrading·from·version·&quot;1&quot;·to·&quot;2&quot;·of·this·application,233 to·be·loaded·when·upgrading·from·version·&quot;1&quot;·to·&quot;2&quot;·of·this·application,
234 <code·class="inline">sp_app.appup</code>·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4656938286-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">234 <code·class="inline">sp_app.appup</code>·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2282864260-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
235 ·</span><span·class="p"·data-group-id="4656938286-2">[</span><span·class="p"·data-group-id="4656938286-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4656938286-4">[</span><span·class="p"·data-group-id="4656938286-5">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4656938286-6">{</span><span·class="ss">advanced</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4656938286-7">[</span><span·class="p"·data-group-id="4656938286-7">]</span><span·class="p"·data-group-id="4656938286-6">}</span><span·class="p"·data-group-id="4656938286-5">}</span><span·class="p"·data-group-id="4656938286-4">]</span><span·class="p"·data-group-id="4656938286-3">}</span><span·class="p"·data-group-id="4656938286-2">]</span><span·class="p">,</span><span·class="w"> 
236 ·</span><span·class="p"·data-group-id="4656938286-8">[</span><span·class="p"·data-group-id="4656938286-9">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4656938286-10">[</span><span·class="p"·data-group-id="4656938286-1[·...·truncated·by·diffoscope;·len:·667,·SHA:·781db05fbaaf972145baf32dfdba47ea99606847d2f182a1953378ee4f9b2319·...·]</span><span·class="w">235 ·</span><span·class="p"·data-group-id="2282864260-2">[</span><span·class="p"·data-group-id="2282864260-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2282864260-4">[</span><span·class="p"·data-group-id="2282864260-5"[·...·truncated·by·diffoscope;·len:·683,·SHA:·b6646d443b9b48357af85a44a9fd4b9e772ce4456e1ef7f108737598604ba32e·...·]</span><span·class="w">
 236 ·</span><span·class="p"·data-group-id="2282864260-8">[</span><span·class="p"·data-group-id="2282864260-9">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2282864260-10">[</span><span·class="p"·data-group-id="2282864260-11">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2282864260-12">{</span><span·class="ss">advanced</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2282864260-13">[</span><span·class="p"·data-group-id="2282864260-13">]</span><span·class="p"·data-group-id="2282864260-12">}</span><span·class="p"·data-group-id="2282864260-11">}</span><span·class="p"·data-group-id="2282864260-10">]</span><span·class="p"·data-group-id="2282864260-9">}</span><span·class="p"·data-group-id="2282864260-8">]</span><span·class="w">
237 </span><span·class="p"·data-group-id="4656938286-1">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">update</code>·instruction·must·contain·the·tuple·<code·class="inline">{advanced,Extra}</code>.·The237 </span><span·class="p"·data-group-id="2282864260-1">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">update</code>·instruction·must·contain·the·tuple·<code·class="inline">{advanced,Extra}</code>.·The
238 instruction·makes·the·special·process·call·the·callback·function238 instruction·makes·the·special·process·call·the·callback·function
239 <code·class="inline">system_code_change/4</code>,·a·function·the·user·must·implement.·The·term·<code·class="inline">Extra</code>,·in239 <code·class="inline">system_code_change/4</code>,·a·function·the·user·must·implement.·The·term·<code·class="inline">Extra</code>,·in
240 this·case·<code·class="inline">[]</code>,·is·passed·as·is·to·<code·class="inline">system_code_change/4</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4993342367-1">(</span><span·class="ss">ch4</span><span·class="p"·data-group-id="4993342367-1">)</span><span·class="p">.</span><span·class="w">240 this·case·<code·class="inline">[]</code>,·is·passed·as·is·to·<code·class="inline">system_code_change/4</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3954672606-1">(</span><span·class="ss">ch4</span><span·class="p"·data-group-id="3954672606-1">)</span><span·class="p">.</span><span·class="w">
241 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">241 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
242 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4993342367-2">(</span><span·class="p"·data-group-id="4993342367-3">[</span><span·class="ss">system_code_change</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="4993342367-3">]</span><span·class="p"·data-group-id="499334[·...·truncated·by·diffoscope;·len:·4,·SHA:·cb5611d87825a1dd6d0c724d68396193dc9d07a0db6a756d34b18bceea1aa46b·...·]-2">)</span><span·class="p">.</span><span·class="w">242 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3954672606-2">(</span><span·class="p"·data-group-id="3954672606-3">[</span><span·class="ss">system_code_change</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="3954672606-3">]</span><span·class="p"·data-group-id="395467[·...·truncated·by·diffoscope;·len:·4,·SHA:·b028e7b30ae6629575651e0369e15c482a1b97a7d437334f1b1cf00f5c06a78f·...·]-2">)</span><span·class="p">.</span><span·class="w">
243 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">243 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
244 </span><span·class="nf">system_code_change</span><span·class="p"·data-group-id="4993342367-4">(</span><span·class="n">Chs</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">OldVsn</span><span·[·...·truncated·by·diffoscope;·len:·135,·SHA:·d8803d959a0ae67796c942239f81faa4ae4bb1bc794ea208ad69314187f5d0e4·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">244 </span><span·class="nf">system_code_change</span><span·class="p"·data-group-id="3954672606-4">(</span><span·class="n">Chs</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">OldVsn</span><span·[·...·truncated·by·diffoscope;·len:·135,·SHA:·edcd9ac7e0e537bc74473688a42047fd81c6e6f2796015903527bd0f65e8ac74·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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144 fast·as·possible,·what·can·we·do?·One·way·could·be·to·generate·more144 fast·as·possible,·what·can·we·do?·One·way·could·be·to·generate·more
145 than·two·bytes·at·the·time.</p><pre><code·class="text">%·erlperf·'rand:bytes(100).'·'crypto:strong_rand_bytes(100).'145 than·two·bytes·at·the·time.</p><pre><code·class="text">%·erlperf·'rand:bytes(100).'·'crypto:strong_rand_bytes(100).'
146 Code···································||········QPS·······Time···Rel146 Code···································||········QPS·······Time···Rel
147 rand:bytes(100).························1····2124·Ki·····470·ns··100%147 rand:bytes(100).························1····2124·Ki·····470·ns··100%
148 crypto:strong_rand_bytes(100).··········1····1915·Ki·····522·ns···90%</code></pre><p><a·href="../../lib/stdlib-6.2.2/doc/html/rand.html#bytes/1"><code·class="inline">rand:bytes/1</code></a>·is·still·faster·when·we·generate·100·bytes·at·the·time,148 crypto:strong_rand_bytes(100).··········1····1915·Ki·····522·ns···90%</code></pre><p><a·href="../../lib/stdlib-6.2.2/doc/html/rand.html#bytes/1"><code·class="inline">rand:bytes/1</code></a>·is·still·faster·when·we·generate·100·bytes·at·the·time,
149 but·the·relative·difference·is·smaller.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erlperf·&#39;rand:bytes(1000).&#39;·&#39;crypto:strong_rand_bytes(1000).&#39;</span><span·class="w">149 but·the·relative·difference·is·smaller.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erlperf·&#39;rand:bytes(1000).&#39;·&#39;crypto:strong_rand_bytes(1000).&#39;</span><span·class="w">
150 </span><span·class="n">Code</span><span·class="w">····································</span><span·class="p">||</span><span·class="w">········</span><span·class="n">QPS</span><span·class="w">·······</span><span·class="n">Time</span><span·class="w">···</span><span·class="n">Rel</span><span·class="w">150 </span><span·class="n">Code</span><span·class="w">····································</span><span·class="p">||</span><span·class="w">········</span><span·class="n">QPS</span><span·class="w">·······</span><span·class="n">Time</span><span·class="w">···</span><span·class="n">Rel</span><span·class="w">
151 </span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">strong_rand_bytes</span><span·class="p"·data-group-id="0351408515-1">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="0351408515-1">)</span><span·class="p">.</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">····</span><span·class="mi">1518</span><span·class="w">·</span><span·class="n">Ki</span><span·class="w">·····</span><span·class="mi">658</span><span·class="w">·</span><span·class="ss">ns</span><span·class="w">··</span><span·class="mi">100</span><span·class="c1">%</span><span·class="w">151 </span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">strong_rand_bytes</span><span·class="p"·data-group-id="5035952162-1">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="5035952162-1">)</span><span·class="p">.</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">····</span><span·class="mi">1518</span><span·class="w">·</span><span·class="n">Ki</span><span·class="w">·····</span><span·class="mi">658</span><span·class="w">·</span><span·class="ss">ns</span><span·class="w">··</span><span·class="mi">100</span><span·class="c1">%</span><span·class="w">
152 </span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">bytes</span><span·class="p"·data-group-id="0351408515-2">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="0351408515-2">)</span><span·class="p">.</span><span·class="w">························</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">284</span><span·class="w">·</span><span·class="n">Ki</span><span·class="w">····</span><span·class="mi">3521</span><span·class="w">·</span><span·class="ss">ns</span><span·class="w">···</span><span·class="mi">19</span><span·class="c1">%</span></code></pre><p>When·we·generate·1000·bytes·at·the·time,·<a·href="../../lib/crypto-5.5.3/doc/html/crypto.html#strong_rand_bytes/1"><code·class="inline">crypto:strong_rand_bytes/1</code></a>·is152 </span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">bytes</span><span·class="p"·data-group-id="5035952162-2">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="5035952162-2">)</span><span·class="p">.</span><span·class="w">························</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">284</span><span·class="w">·</span><span·class="n">Ki</span><span·class="w">····</span><span·class="mi">3521</span><span·class="w">·</span><span·class="ss">ns</span><span·class="w">···</span><span·class="mi">19</span><span·class="c1">%</span></code></pre><p>When·we·generate·1000·bytes·at·the·time,·<a·href="../../lib/crypto-5.5.3/doc/html/crypto.html#strong_rand_bytes/1"><code·class="inline">crypto:strong_rand_bytes/1</code></a>·is
153 now·the·fastest.</p><h2·id="benchmarking-using-erlang-otp-functionality"·class="section-heading">153 now·the·fastest.</p><h2·id="benchmarking-using-erlang-otp-functionality"·class="section-heading">
154 ··<a·href="#benchmarking-using-erlang-otp-functionality"·class="hover-link">154 ··<a·href="#benchmarking-using-erlang-otp-functionality"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">Benchmarking·using·Erlang/OTP·functionality</span>157 ··<span·class="text">Benchmarking·using·Erlang/OTP·functionality</span>
158 </h2>158 </h2>
159 <p>Benchmarks·can·measure·wall-clock·time·or·CPU·time.</p><ul><li><p><a·href="../../lib/stdlib-6.2.2/doc/html/timer.html#tc/3"><code·class="inline">timer:tc/3</code></a>·measures·wall-clock·time.·The·advantage·with·wall-clock·time·is159 <p>Benchmarks·can·measure·wall-clock·time·or·CPU·time.</p><ul><li><p><a·href="../../lib/stdlib-6.2.2/doc/html/timer.html#tc/3"><code·class="inline">timer:tc/3</code></a>·measures·wall-clock·time.·The·advantage·with·wall-clock·time·is
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219 ······<p·class="built-using">219 ······<p·class="built-using">
220 ········Built·using220 ········Built·using
221 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the221 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
222 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>222 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
223 ······</p>223 ······</p>
224 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>224 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
225 ····</footer>225 ····</footer>
226 ··</div>226 ··</div>
227 </main>227 </main>
228 </div>228 </div>
229 <script>229 <script>
230 ··function·mermaidLoaded()·{230 ··function·mermaidLoaded()·{
231 ····mermaid.initialize({231 ····mermaid.initialize({
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114 ····<span>Constructing·and·Matching·Binaries</span>114 ····<span>Constructing·and·Matching·Binaries</span>
115 ··</h1>115 ··</h1>
  
116 <p>This·section·gives·a·few·examples·on·how·to·handle·binaries·in·an·efficient·way.116 <p>This·section·gives·a·few·examples·on·how·to·handle·binaries·in·an·efficient·way.
117 The·sections·that·follow·take·an·in-depth·look·at·how·binaries·are·implemented117 The·sections·that·follow·take·an·in-depth·look·at·how·binaries·are·implemented
118 and·how·to·best·take·advantages·of·the·optimizations·done·by·the·compiler·and118 and·how·to·best·take·advantages·of·the·optimizations·done·by·the·compiler·and
119 runtime·system.</p><p>Binaries·can·be·efficiently·<em>built</em>·in·the·following·way:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="7301865443-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="7301865443-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">119 runtime·system.</p><p>Binaries·can·be·efficiently·<em>built</em>·in·the·following·way:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="0556890491-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="0556890491-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
120 ····</span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="7301865443-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7301865443-3">&lt;&lt;</span><span·class="p"·data-group-id="7301865443-3">&gt;&gt;</span><span·class="p"·data-group-id="73018654[·...·truncated·by·diffoscope;·len:·2,·SHA:·44cb730c420480a0477b505ae68af508fb90f96cf0ec54c6ad16949dd427f13a·...·]-2">)</span><span·class="p">.</span><span·class="w">120 ····</span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="0556890491-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0556890491-3">&lt;&lt;</span><span·class="p"·data-group-id="0556890491-3">&gt;&gt;</span><span·class="p"·data-group-id="05568904[·...·truncated·by·diffoscope;·len:·2,·SHA:·1da51b8d8ff98f6a48f80ae79fe3ca6c26e1abb7b7d125259255d6d2b875ea08·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
121 </span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="7301865443-4">(</span><span·class="p"·data-group-id="7301865443-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7301865443-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·7f9d093a7d5e3312cc17e89f2d6250abad7cda7e40295a963d405d83b7f448f5·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">121 </span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="0556890491-4">(</span><span·class="p"·data-group-id="0556890491-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="0556890491-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·d0846b6fe72b557d153cc0930de5063bbf65702af909cf5ca7d1213f851395f6·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
122 ····</span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="7301865443-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7301865443-7">&lt;&lt;</span><span·class="n">Acc</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·127,·SHA:·d4512131e70df434bc47d7dd9a11f9670272da35872cac7c79c45cc4a534e4fb·...·]-6">)</span><span·class="p">;</span><span·class="w">122 ····</span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="0556890491-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0556890491-7">&lt;&lt;</span><span·class="n">Acc</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·127,·SHA:·d4e9b87903f1fab380810217bb31878f548e2181508b3cdb790538005beb9107·...·]-6">)</span><span·class="p">;</span><span·class="w">
123 </span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="7301865443-8">(</span><span·class="p"·data-group-id="7301865443-9">[</span><span·class="p"·data-group-id="7301865443-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="7301865443-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">123 </span><span·class="nf">my_list_to_binary</span><span·class="p"·data-group-id="0556890491-8">(</span><span·class="p"·data-group-id="0556890491-9">[</span><span·class="p"·data-group-id="0556890491-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="0556890491-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
124 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>Appending·data·to·a·binary·as·in·the·example·is·efficient·because·it·is124 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>Appending·data·to·a·binary·as·in·the·example·is·efficient·because·it·is
125 specially·optimized·by·the·runtime·system·to·avoid·copying·the·<code·class="inline">Acc</code>·binary125 specially·optimized·by·the·runtime·system·to·avoid·copying·the·<code·class="inline">Acc</code>·binary
126 every·time.</p><p>Prepending·data·to·a·binary·in·a·loop·is·not·efficient:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7720930945-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="7720930945-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">126 every·time.</p><p>Prepending·data·to·a·binary·in·a·loop·is·not·efficient:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7914688437-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="7914688437-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
127 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7720930945-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7720930945-3">&lt;&lt;</span><span·class="p"·data-group-id="7720930945-3">&gt;&gt;</span><span·class="p"·data-group-id="772093094[·...·truncated·by·diffoscope;·len:·1,·SHA:·ef2d127de37b942baad06145e54b0c619a1f22327b2ebbcfbec78f5564afe39d·...·]-2">)</span><span·class="p">.</span><span·class="w">127 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7914688437-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7914688437-3">&lt;&lt;</span><span·class="p"·data-group-id="7914688437-3">&gt;&gt;</span><span·class="p"·data-group-id="791468843[·...·truncated·by·diffoscope;·len:·1,·SHA:·7902699be42c8a8e46fbbb4501726517e86b22c56a189f7625a6da49081b2451·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
128 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7720930945-4">(</span><span·class="p"·data-group-id="7720930945-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7720930945-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·58,·SHA:·f39ae8b7d95bf8993327df187af8bebb76254d523d4fcaaab66c395dd02ed75e·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">128 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7914688437-4">(</span><span·class="p"·data-group-id="7914688437-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7914688437-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·58,·SHA:·e1563f603ad09ef679fa2e3d2d26adf3766015e325314f326de8ff41b25aef2c·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
129 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7720930945-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7720930945-7">&lt;&lt;</span><span·class="n">H</span><span·class="p">,</span><span·class="n">Acc</span><span·class="o">/</span><span[·...·truncated·by·diffoscope;·len:·126,·SHA:·4df6a98de6fc5c324c44be5ab37aa3d7a97e98f3991862139ac33bd866fe09cb·...·]-6">)</span><span·class="p">;</span><span·class="w">129 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7914688437-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7914688437-7">&lt;&lt;</span><span·class="n">H</span><span·class="p">,</span><span·class="n">Acc</span><span·class="o">/</span><span[·...·truncated·by·diffoscope;·len:·126,·SHA:·724a6dd48590c2f26c4e55b961d17a63d0f697d220e7ee666cb13ddc5f40051f·...·]-6">)</span><span·class="p">;</span><span·class="w">
130 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7720930945-8">(</span><span·class="p"·data-group-id="7720930945-9">[</span><span·class="p"·data-group-id="7720930945-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="7720930945-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">130 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="7914688437-8">(</span><span·class="p"·data-group-id="7914688437-9">[</span><span·class="p"·data-group-id="7914688437-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="7914688437-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
131 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>This·is·not·efficient·for·long·lists·because·the·<code·class="inline">Acc</code>·binary·is·copied·every131 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>This·is·not·efficient·for·long·lists·because·the·<code·class="inline">Acc</code>·binary·is·copied·every
132 time.·One·way·to·make·the·function·more·efficient·is·like·this:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="4087029374-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="4087029374-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">132 time.·One·way·to·make·the·function·more·efficient·is·like·this:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="6508535814-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="6508535814-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
133 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="4087029374-2">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="4087029374-3">(</span><span·class="n">List</span><span·class="p"·data-group-id="4087029374-3">)</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·191,·SHA:·185c7548afb2565cdf22fcd73ac8def69538264142b6dd0c92356c463560224e·...·]4-2">)</span><span·class="p">.</span><span·class="w">133 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="6508535814-2">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="6508535814-3">(</span><span·class="n">List</span><span·class="p"·data-group-id="6508535814-3">)</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·191,·SHA:·1ade02d2f8be60249e28c7c1e47d5867484b19c8df4620cc4844091f5d993479·...·]4-2">)</span><span·class="p">.</span><span·class="w">
  
134 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="4087029374-5">(</span><span·class="p"·data-group-id="4087029374-6">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="4087029374-6">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·58,·SHA:·d0afa12d1050839ad07f033da971b6f41fd2843248d7df49c0566cba2961b641·...·]4-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">134 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="6508535814-5">(</span><span·class="p"·data-group-id="6508535814-6">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="6508535814-6">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·58,·SHA:·54a3a442e318b7ea1ebb5fb5e27a9389b31f5aa1392a4a5de5814fb72e6a136c·...·]4-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
135 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="4087029374-7">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4087029374-8">&lt;&lt;</span><span·class="n">Acc</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·126,·SHA:·236bc8f8fde4a7c1bfe2cae788d37b002efc406a01d27205c11c203d0ebe0266·...·]4-7">)</span><span·class="p">;</span><span·class="w">135 ····</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="6508535814-7">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6508535814-8">&lt;&lt;</span><span·class="n">Acc</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·126,·SHA:·29f5fa832dac67c0cd922df77da7db7b26f7d63c5a2388d86a65a19fae5d0d04·...·]4-7">)</span><span·class="p">;</span><span·class="w">
136 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="4087029374-9">(</span><span·class="p"·data-group-id="4087029374-10">[</span><span·class="p"·data-group-id="4087029374-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="4087029374-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">136 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="6508535814-9">(</span><span·class="p"·data-group-id="6508535814-10">[</span><span·class="p"·data-group-id="6508535814-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="6508535814-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
137 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>Another·way·to·avoid·copying·the·binary·each·time·is·like·this:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="2922117592-1">(</span><span·class="p"·data-group-id="2922117592-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="2922117592-2">]</span><span·class="p"·data-group-id="2922117592-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">137 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>Another·way·to·avoid·copying·the·binary·each·time·is·like·this:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="8878911861-1">(</span><span·class="p"·data-group-id="8878911861-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="8878911861-2">]</span><span·class="p"·data-group-id="8878911861-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
138 ····</span><span·class="n">RevTail</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="2922117592-3">(</span><span·class="n">T</span><span·class="p"·data-group-id="2922117592-3">)</span><span·class="p">,</span><span·class="w">138 ····</span><span·class="n">RevTail</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="8878911861-3">(</span><span·class="n">T</span><span·class="p"·data-group-id="8878911861-3">)</span><span·class="p">,</span><span·class="w">
139 ····</span><span·class="p"·data-group-id="2922117592-4">&lt;&lt;</span><span·class="n">RevTail</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">H</span><span·class="p"·data-group-id="2922117592-4">&gt;&gt;</span><span·class="p">;</span><span·class="w">139 ····</span><span·class="p"·data-group-id="8878911861-4">&lt;&lt;</span><span·class="n">RevTail</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">H</span><span·class="p"·data-group-id="8878911861-4">&gt;&gt;</span><span·class="p">;</span><span·class="w">
140 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="2922117592-5">(</span><span·class="p"·data-group-id="2922117592-6">[</span><span·class="p"·data-group-id="2922117592-6">]</span><span·class="p"·data-group-id="2922117592-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
141 ····</span><span·class="p"·data-group-id="2922117592-7">&lt;&lt;</span><span·class="p"·data-group-id="2922117592-7">&gt;&gt;</span><span·class="p">.</span></code></pre><p>Note·that·in·each·of·the·<strong>DO</strong>·examples,·the·binary·to·be·appended·to·i[·...·truncated·by·diffoscope;·len:·8,·SHA:·ee9f41af6e44746b0eae12b0b3f626285dac5b4448cd99235f3abfd8e0c08444·...·]140 </span><span·class="nf">rev_list_to_binary</span><span·class="p"·data-group-id="8878911861-5">(</span><span·class="p"·data-group-id="8878911861-6">[</span><span·class="p"·data-group-id="8878911861-6">]</span><span·class="p"·data-group-id="8878911861-5">)</[·...·truncated·by·diffoscope;·len:·73,·SHA:·621e88e8c85b8c8ae926ada234cc8410560f2afe2a1d43185b41e518e5686898·...·]
 141 ····</span><span·class="p"·data-group-id="8878911861-7">&lt;&lt;</span><span·class="p"·data-group-id="8878911861-7">&gt;&gt;</span><span·class="p">.</span></code></pre><p>Note·that·in·each·of·the·<strong>DO</strong>·examples,·the·binary·to·be·appended·to·is·always
142 given·as·the·first·segment.</p><p>Binaries·can·be·efficiently·<em>matched</em>·in·the·following·way:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_binary_to_list</span><span·class="p"·data-group-id="0002427748-1">(</span><span·class="p"·data-group-id="0002427748-2">&lt;&lt;</span><span·class="n">H</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="0002427748-2">&gt[·...·truncated·by·diffoscope;·len:·53,·SHA:·aaaceac44ecac0256a3e4b48e3472614ead3822baebcfd83e1fc8dfc310354ca·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">142 given·as·the·first·segment.</p><p>Binaries·can·be·efficiently·<em>matched</em>·in·the·following·way:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_binary_to_list</span><span·class="p"·data-group-id="2278067172-1">(</span><span·class="p"·data-group-id="2278067172-2">&lt;&lt;</span><span·class="n">H</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="2278067172-2">&gt[·...·truncated·by·diffoscope;·len:·53,·SHA:·51ed6a5505077428dcc65792f7d174b4f23c0bc1eadf38692f7b816fd419456a·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
143 ····</span><span·class="p"·data-group-id="0002427748-3">[</span><span·class="n">H</span><span·class="p">|</span><span·class="nf">my_binary_to_list</span><span·class="p"·data-group-id="0002427748-4">(</span><span·class="n">T</span><span·class="p"·data-group-id="0002427748-4">)</span><span·class="p"·data-group-id="0002427748-3">]</span><span·class="p">;</span><span·class="w"> 
144 </span><span·class="nf">my_binary_to_list</span><span·class="p"·data-group-id="0002427748-5">(</span><span·class="p"·data-group-id="0002427748-6">&lt;&lt;</span><span·class="p"·data-group-id="0002427748-6">&gt;&gt;</span><span·class="p"·data-group-id="0002[·...·truncated·by·diffoscope;·len:·297,·SHA:·4ce32afe9d579f2a4c66428df0d44c9f836a281026c7efd130a9c898cd77261f·...·]">143 ····</span><span·class="p"·data-group-id="2278067172-3">[</span><span·class="n">H</span><span·class="p">|</span><span·class="nf">my_binary_to_list</span><span·class="p"·data-group-id="2278067172-4">(</span><span·class="n">T</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·118,·SHA:·ef2d757d33be06b4a74f552db784c3463569fd8563e96345a6affbe99fc06f83·...·]">
 144 </span><span·class="nf">my_binary_to_list</span><span·class="p"·data-group-id="2278067172-5">(</span><span·class="p"·data-group-id="2278067172-6">&lt;&lt;</span><span·class="p"·data-group-id="2278067172-6">&gt;&gt;</span><span·class="p"·data-group-id="2278067172-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2278067172-7">[</span><span·class="p"·data-group-id="2278067172-7">]</span><span·class="p">.</span></code></pre><h2·id="how-binaries-are-implemented"·class="section-heading">
145 ··<a·href="#how-binaries-are-implemented"·class="hover-link">145 ··<a·href="#how-binaries-are-implemented"·class="hover-link">
146 ····<i·class="ri-link-m"·aria-hidden="true"></i>146 ····<i·class="ri-link-m"·aria-hidden="true"></i>
147 ··</a>147 ··</a>
148 ··<span·class="text">How·Binaries·are·Implemented</span>148 ··<span·class="text">How·Binaries·are·Implemented</span>
149 </h2>149 </h2>
150 <p>Internally,·binaries·and·bitstrings·are·implemented·in·the·same·way.·In·this150 <p>Internally,·binaries·and·bitstrings·are·implemented·in·the·same·way.·In·this
151 section,·they·are·called·<em>binaries</em>·because·that·is·what·they·are·called·in·the151 section,·they·are·called·<em>binaries</em>·because·that·is·what·they·are·called·in·the
Offset 205, 29 lines modifiedOffset 205, 29 lines modified
205 called·referential·transparency)·of·Erlang·would·break.</p><h2·id="constructing-binaries"·class="section-heading">205 called·referential·transparency)·of·Erlang·would·break.</p><h2·id="constructing-binaries"·class="section-heading">
206 ··<a·href="#constructing-binaries"·class="hover-link">206 ··<a·href="#constructing-binaries"·class="hover-link">
207 ····<i·class="ri-link-m"·aria-hidden="true"></i>207 ····<i·class="ri-link-m"·aria-hidden="true"></i>
208 ··</a>208 ··</a>
209 ··<span·class="text">Constructing·Binaries</span>209 ··<span·class="text">Constructing·Binaries</span>
210 </h2>210 </h2>
211 <p>Appending·to·a·binary·or·bitstring·in·the·following·way·is·specially·optimized211 <p>Appending·to·a·binary·or·bitstring·in·the·following·way·is·specially·optimized
212 to·avoid·copying·the·binary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7988575547-1">&lt;&lt;</span><span·class="n">Binary</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·16,·SHA:·96b72f3fc5105875a2cc6ad70f2c27e46da15c5cc01ffdca68e205fd91bacfa0·...·]7-1">&gt;&gt;</span><span·class="w">212 to·avoid·copying·the·binary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9492776637-1">&lt;&lt;</span><span·class="n">Binary</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·16,·SHA:·ea02072fdb38ed61fa0ba0fa59f69a498c9b966470537aef6f263ef5935e0ac1·...·]7-1">&gt;&gt;</span><span·class="w">
213 </span><span·class="c1">%%·-·OR·-</span><span·class="w">213 </span><span·class="c1">%%·-·OR·-</span><span·class="w">
214 </span><span·class="p"·data-group-id="7988575547-2">&lt;&lt;</span><span·class="n">Binary</span><span·class="o">/</span><span·class="ss">bitstring</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·ddd46804a50e183e2eed9022d53911bbc4ba534404807f8546bfaa5ef97ee975·...·]7-2">&gt;&gt;</span></code></pre><p>This·optimization·is·applied·by·the·runtime·system·in·a·way·that·makes·it214 </span><span·class="p"·data-group-id="9492776637-2">&lt;&lt;</span><span·class="n">Binary</span><span·class="o">/</span><span·class="ss">bitstring</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·e45f7221d45e5147e27d6bdaaba8ef5eeebd2e68d5fd032ec4fae36c487f7f66·...·]7-2">&gt;&gt;</span></code></pre><p>This·optimization·is·applied·by·the·runtime·system·in·a·way·that·makes·it
215 effective·in·most·circumstances·(for·exceptions,·see215 effective·in·most·circumstances·(for·exceptions,·see
216 <a·href="binaryhandling.html#forced_copying">Circumstances·That·Force·Copying</a>).·The216 <a·href="binaryhandling.html#forced_copying">Circumstances·That·Force·Copying</a>).·The
217 optimization·in·its·basic·form·does·not·need·any·help·from·the·compiler.217 optimization·in·its·basic·form·does·not·need·any·help·from·the·compiler.
218 However,·the·compiler·add·hints·to·the·runtime·system·when·it·is·safe·to·apply218 However,·the·compiler·add·hints·to·the·runtime·system·when·it·is·safe·to·apply
219 the·optimization·in·a·more·efficient·way.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>The·compiler·support·for·making·the·optimization·more·efficient·was·added·in219 the·optimization·in·a·more·efficient·way.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>The·compiler·support·for·making·the·optimization·more·efficient·was·added·in
220 Erlang/OTP·26.</p></section><p>To·explain·how·the·basic·optimization·works,·let·us·examine·the·following·code220 Erlang/OTP·26.</p></section><p>To·explain·how·the·basic·optimization·works,·let·us·examine·the·following·code
221 line·by·line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6125065216-1">&lt;&lt;</span><span·class="mi">0</span><span·class="p"·data-group-id="6125065216-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">····················</span><span·class="c1">%%·1</span><span·class="w">221 line·by·line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9897273344-1">&lt;&lt;</span><span·class="mi">0</span><span·class="p"·data-group-id="9897273344-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">····················</span><span·class="c1">%%·1</span><span·class="w">
222 </span><span·class="n">Bin1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6125065216-2">&lt;&lt;</span><span·class="n">Bin0</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·181764ad3f7276663d44f34d29a78f9d9f4deeb1d544ea371f6134494bc6ee87·...·]-2">&gt;&gt;</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%%·2</span><span·class="w">222 </span><span·class="n">Bin1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9897273344-2">&lt;&lt;</span><span·class="n">Bin0</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·d2fdfbafd4d13f2acacbdf29c2250f40774f0c23b32cc7a85db3da6b4a23f2bf·...·]-2">&gt;&gt;</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%%·2</span><span·class="w">
223 </span><span·class="n">Bin2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6125065216-3">&lt;&lt;</span><span·class="n">Bin1</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·181764ad3f7276663d44f34d29a78f9d9f4deeb1d544ea371f6134494bc6ee87·...·]-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%%·3</span><span·class="w">223 </span><span·class="n">Bin2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9897273344-3">&lt;&lt;</span><span·class="n">Bin1</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·d2fdfbafd4d13f2acacbdf29c2250f40774f0c23b32cc7a85db3da6b4a23f2bf·...·]-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%%·3</span><span·class="w">
224 </span><span·class="n">Bin3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6125065216-4">&lt;&lt;</span><span·class="n">Bin2</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">9</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·181764ad3f7276663d44f34d29a78f9d9f4deeb1d544ea371f6134494bc6ee87·...·]-4">&gt;&gt;</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%%·4</span><span·class="w">224 </span><span·class="n">Bin3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9897273344-4">&lt;&lt;</span><span·class="n">Bin2</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">9</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·d2fdfbafd4d13f2acacbdf29c2250f40774f0c23b32cc7a85db3da6b4a23f2bf·...·]-4">&gt;&gt;</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%%·4</span><span·class="w">
225 </span><span·class="n">Bin4</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6125065216-5">&lt;&lt;</span><span·class="n">Bin1</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="6125065216-5">&gt;&gt;</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%%·5·!!!</span><span·class="w">225 </span><span·class="n">Bin4</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9897273344-5">&lt;&lt;</span><span·class="n">Bin1</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="9897273344-5">&gt;&gt;</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%%·5·!!!</span><span·class="w">
226 </span><span·class="p"·data-group-id="6125065216-6">{</span><span·class="n">Bin4</span><span·class="p">,</span><span·class="n">Bin3</span><span·class="p"·data-group-id="6125065216-6">}</span><span·class="w">······················</span><span·class="c1">%%·6</span></code></pre><ul><li><p>Line·1·(marked·with·the·<code·class="inline">%%·1</code>·comment),·assigns·a226 </span><span·class="p"·data-group-id="9897273344-6">{</span><span·class="n">Bin4</span><span·class="p">,</span><span·class="n">Bin3</span><span·class="p"·data-group-id="9897273344-6">}</span><span·class="w">······················</span><span·class="c1">%%·6</span></code></pre><ul><li><p>Line·1·(marked·with·the·<code·class="inline">%%·1</code>·comment),·assigns·a
227 <a·href="binaryhandling.html#heap_binary">heap·binary</a>·to·the·<code·class="inline">Bin0</code>·variable.</p></li><li><p>Line·2·is·an·append·operation.·As·<code·class="inline">Bin0</code>·has·not·been·involved·in·an·append227 <a·href="binaryhandling.html#heap_binary">heap·binary</a>·to·the·<code·class="inline">Bin0</code>·variable.</p></li><li><p>Line·2·is·an·append·operation.·As·<code·class="inline">Bin0</code>·has·not·been·involved·in·an·append
228 operation,·a·new·<a·href="binaryhandling.html#refc_binary">refc·binary</a>·is·created·and228 operation,·a·new·<a·href="binaryhandling.html#refc_binary">refc·binary</a>·is·created·and
229 the·contents·of·<code·class="inline">Bin0</code>·is·copied·into·it.·The·<em>ProcBin</em>·part·of·the·refc229 the·contents·of·<code·class="inline">Bin0</code>·is·copied·into·it.·The·<em>ProcBin</em>·part·of·the·refc
230 binary·has·its·size·set·to·the·size·of·the·data·stored·in·the·binary,·while230 binary·has·its·size·set·to·the·size·of·the·data·stored·in·the·binary,·while
231 the·binary·object·has·extra·space·allocated.·The·size·of·the·binary·object·is231 the·binary·object·has·extra·space·allocated.·The·size·of·the·binary·object·is
232 either·twice·the·size·of·<code·class="inline">Bin1</code>·or·256,·whichever·is·larger.·In·this·case·it232 either·twice·the·size·of·<code·class="inline">Bin1</code>·or·256,·whichever·is·larger.·In·this·case·it
233 is·256.</p></li><li><p>Line·3·is·more·interesting.·<code·class="inline">Bin1</code>·<em>has</em>·been·used·in·an·append·operation,·and233 is·256.</p></li><li><p>Line·3·is·more·interesting.·<code·class="inline">Bin1</code>·<em>has</em>·been·used·in·an·append·operation,·and
Offset 253, 23 lines modifiedOffset 253, 23 lines modified
253 handle·an·append·operation·to·a·heap·binary·by·copying·it·to·a·refc·binary·(line253 handle·an·append·operation·to·a·heap·binary·by·copying·it·to·a·refc·binary·(line
254 2),·and·also·handle·an·append·operation·to·a·previous·version·of·the·binary·by254 2),·and·also·handle·an·append·operation·to·a·previous·version·of·the·binary·by
255 copying·it·(line·5).·The·support·for·doing·that·does·not·come·for·free.·For255 copying·it·(line·5).·The·support·for·doing·that·does·not·come·for·free.·For
256 example,·to·make·it·possible·to·know·when·it·is·necessary·to·copy·the·binary,256 example,·to·make·it·possible·to·know·when·it·is·necessary·to·copy·the·binary,
257 for·every·append·operation,·the·runtime·system·must·create·a·sub·binary.</p><p>When·the·compiler·can·determine·that·none·of·those·situations·need·to·be·handled257 for·every·append·operation,·the·runtime·system·must·create·a·sub·binary.</p><p>When·the·compiler·can·determine·that·none·of·those·situations·need·to·be·handled
258 and·that·the·append·operation·cannot·possibly·fail,·the·compiler·generates·code258 and·that·the·append·operation·cannot·possibly·fail,·the·compiler·generates·code
259 that·causes·the·runtime·system·to·apply·a·more·efficient·variant·of·the259 that·causes·the·runtime·system·to·apply·a·more·efficient·variant·of·the
260 optimization.</p><p><strong>Example:</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1993449612-1">(</span><span·class="ss">repack</span><span·class="p"·data-group-id="1993449612-1">)</span><span·class="p">.</span><span·class="w"> 
261 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1993449612-2">(</span><span·class="p"·data-group-id="1993449612-3">[</span><span·class="ss">repack</span><span·class="p">/</span><span·class="mi">1</span><span·clas[·...·truncated·by·diffoscope;·len:·86,·SHA:·3b3becd4e697bf72a12d68434c6b94e564a97063fd4d2da88c161f2662b471e5·...·]">)</span><span·class="p">.</span><span·class="w">260 optimization.</p><p><strong>Example:</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7743927722-1">(</span><span·class="ss">repack</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·21,·SHA:·af0df47dca2f38dd7404878a63bc6a15cfbeb2bdc8ee2e7b752722436b34e0ff·...·]">)</span><span·class="p">.</span><span·class="w">
 261 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7743927722-2">(</span><span·class="p"·data-group-id="7743927722-3">[</span><span·class="ss">repack</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="7743927722-3">]</span><span·class="p"·data-group-id="7743927722-2">)</span><span·class="p">.</span><span·class="w">
  
262 </span><span·class="nf">repack</span><span·class="p"·data-group-id="1993449612-4">(</span><span·class="n">Bin</span><span·class="p"·data-group-id="1993449612-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="1993449612-5">(<[·...·truncated·by·diffoscope;·len:·72,·SHA:·a644d4ae17181bb646027f13f6815d40398c4b878f5d9f3c2be3f1d25800defa·...·]2-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">262 </span><span·class="nf">repack</span><span·class="p"·data-group-id="7743927722-4">(</span><span·class="n">Bin</span><span·class="p"·data-group-id="7743927722-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="7743927722-5">(<[·...·truncated·by·diffoscope;·len:·72,·SHA:·c8bcbc1132c268776ce99a32b889f6df197b0134f719c974210cacbce494a29d·...·]2-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
263 ····</span><span·class="nf">repack</span><span·class="p"·data-group-id="1993449612-6">(</span><span·class="n">Bin</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1993449612-7">&lt;&lt;</span><span·class="p"·data-group-id="1993449612-7">&gt;&gt;</span><span·class="p"·data-group-id="1993449612-6">)</span><span·class="p">.</span><span·class="w">263 ····</span><span·class="nf">repack</span><span·class="p"·data-group-id="7743927722-6">(</span><span·class="n">Bin</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7743927722-7">&lt;&lt;</span><span·class="p"·data-group-id="7743927722-7">&gt;&gt;</span><span·class="p"·data-group-id="7743927722-6">)</span><span·class="p">.</span><span·class="w">
  
264 </span><span·class="nf">repack</span><span·class="p"·data-group-id="1993449612-8">(</span><span·class="p"·data-group-id="1993449612-9">&lt;&lt;</span><span·class="n">C</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span[·...·truncated·by·diffoscope;·len:·178,·SHA:·9fb18eaf0dea12df93a3141e3ebfd7861d74b487ad00cd4049da25fbe7eae767·...·]2-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">264 </span><span·class="nf">repack</span><span·class="p"·data-group-id="7743927722-8">(</span><span·class="p"·data-group-id="7743927722-9">&lt;&lt;</span><span·class="n">C</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span[·...·truncated·by·diffoscope;·len:·178,·SHA:·c364ae083b2455de5bd675804330d52c87850adaadfa20beef9dba4f7f94842c·...·]2-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
265 ····</span><span·class="nf">repack</span><span·class="p"·data-group-id="1993449612-10">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1993449612-11">&lt;&lt;</span><span·class="n">Result</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·182,·SHA:·78b4bc880e9314f8848a6901cf017e3129f7a6ab067064d4f13f3dab9ffa2f47·...·]2-10">)</span><span·class="p">;</span><span·class="w">265 ····</span><span·class="nf">repack</span><span·class="p"·data-group-id="7743927722-10">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7743927722-11">&lt;&lt;</span><span·class="n">Result</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·182,·SHA:·7db1720adab5c1f5f7580ac9dce36bdf41181d5b2963e54e05f1b51e057be9eb·...·]2-10">)</span><span·class="p">;</span><span·class="w">
266 </span><span·class="nf">repack</span><span·class="p"·data-group-id="1993449612-12">(</span><span·class="p"·data-group-id="1993449612-13">&lt;&lt;</span><span·class="p"·data-group-id="1993449612-13">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="199[·...·truncated·by·diffoscope;·len:·6,·SHA:·8b7e35195eb6a6f14a2d5d23762059d9c96292c118fb2de92659238048b11d86·...·]2-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">266 </span><span·class="nf">repack</span><span·class="p"·data-group-id="7743927722-12">(</span><span·class="p"·data-group-id="7743927722-13">&lt;&lt;</span><span·class="p"·data-group-id="7743927722-13">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="774[·...·truncated·by·diffoscope;·len:·6,·SHA:·07fd4631e5a71775d55341abf05936ff2a4cfc7119a7913fc7d4be756a08b82b·...·]2-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
267 ····</span><span·class="n">Result</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">repack/2</code>·function·only·keeps·a·single·version·of·the·binary,·so·there·is267 ····</span><span·class="n">Result</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">repack/2</code>·function·only·keeps·a·single·version·of·the·binary,·so·there·is
268 never·any·need·to·copy·the·binary.·The·compiler·rewrites·the·creation·of·the268 never·any·need·to·copy·the·binary.·The·compiler·rewrites·the·creation·of·the
269 empty·binary·in·<code·class="inline">repack/1</code>·to·instead·create·a·refc·binary·with·256·bytes269 empty·binary·in·<code·class="inline">repack/1</code>·to·instead·create·a·refc·binary·with·256·bytes
270 already·reserved;·thus,·the·append·operation·in·<code·class="inline">repack/2</code>·never·needs·to·handle270 already·reserved;·thus,·the·append·operation·in·<code·class="inline">repack/2</code>·never·needs·to·handle
271 a·binary·not·prepared·for·appending.</p><p><a·href=""·id="forced_copying"></a></p><h3·id="circumstances-that-force-copying"·class="section-heading">271 a·binary·not·prepared·for·appending.</p><p><a·href=""·id="forced_copying"></a></p><h3·id="circumstances-that-force-copying"·class="section-heading">
272 ··<a·href="#circumstances-that-force-copying"·class="hover-link">272 ··<a·href="#circumstances-that-force-copying"·class="hover-link">
273 ····<i·class="ri-link-m"·aria-hidden="true"></i>273 ····<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 281, 72 lines modifiedOffset 281, 72 lines modified
281 reason·is·that·the·binary·object·can·be·moved·(reallocated)·during·an·append281 reason·is·that·the·binary·object·can·be·moved·(reallocated)·during·an·append
282 operation,·and·when·that·happens,·the·pointer·in·the·ProcBin·must·be·updated.·If282 operation,·and·when·that·happens,·the·pointer·in·the·ProcBin·must·be·updated.·If
283 there·would·be·more·than·one·ProcBin·pointing·to·the·binary·object,·it·would·not283 there·would·be·more·than·one·ProcBin·pointing·to·the·binary·object,·it·would·not
284 be·possible·to·find·and·update·all·of·them.</p><p>Therefore,·certain·operations·on·a·binary·mark·it·so·that·any·future·append284 be·possible·to·find·and·update·all·of·them.</p><p>Therefore,·certain·operations·on·a·binary·mark·it·so·that·any·future·append
285 operation·will·be·forced·to·copy·the·binary.·In·most·cases,·the·binary·object285 operation·will·be·forced·to·copy·the·binary.·In·most·cases,·the·binary·object
286 will·be·shrunk·at·the·same·time·to·reclaim·the·extra·space·allocated·for286 will·be·shrunk·at·the·same·time·to·reclaim·the·extra·space·allocated·for
287 growing.</p><p>When·appending·to·a·binary·as·follows,·only·the·binary·returned·from·the·latest287 growing.</p><p>When·appending·to·a·binary·as·follows,·only·the·binary·returned·from·the·latest
288 append·operation·will·support·further·cheap·append·operations:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8851125393-1">&lt;&lt;</span><span·class="n">Bin0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="8851125393-1">&gt;&gt;</span></code></pre><p>In·the·code·fragment·in·the·beginning·of·this·section,·appending·to·<code·class="inline">Bin</code>·will288 append·operation·will·support·further·cheap·append·operations:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2169102083-1">&lt;&lt;</span><span·class="n">Bin0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2169102083-1">&gt;&gt;</span></code></pre><p>In·the·code·fragment·in·the·beginning·of·this·section,·appending·to·<code·class="inline">Bin</code>·will
289 be·cheap,·while·appending·to·<code·class="inline">Bin0</code>·will·force·the·creation·of·a·new·binary·and289 be·cheap,·while·appending·to·<code·class="inline">Bin0</code>·will·force·the·creation·of·a·new·binary·and
290 copying·of·the·contents·of·<code·class="inline">Bin0</code>.</p><p>If·a·binary·is·sent·as·a·message·to·a·process·or·port,·the·binary·will·be·shrunk290 copying·of·the·contents·of·<code·class="inline">Bin0</code>.</p><p>If·a·binary·is·sent·as·a·message·to·a·process·or·port,·the·binary·will·be·shrunk
291 and·any·further·append·operation·will·copy·the·binary·data·into·a·new·binary.291 and·any·further·append·operation·will·copy·the·binary·data·into·a·new·binary.
292 For·example,·in·the·following·code·fragment·<code·class="inline">Bin1</code>·will·be·copied·in·the·third292 For·example,·in·the·following·code·fragment·<code·class="inline">Bin1</code>·will·be·copied·in·the·third
293 line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0750277428-1">&lt;&lt;</span><span·class="n">Bin0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0750277428-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">293 line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4324032105-1">&lt;&lt;</span><span·class="n">Bin0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="4324032105-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">
294 </span><span·class="n">PortOrPid</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="w">294 </span><span·class="n">PortOrPid</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="w">
295 </span><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0750277428-2">&lt;&lt;</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0750277428-2">&gt;&gt;</span><span·class="w">··</span><span·class="c1">%%·Bin1·will·be·COPIED</span></code></pre><p>The·same·happens·if·you·insert·a·binary·into·an·Ets·table,·send·it·to·a·port295 </span><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4324032105-2">&lt;&lt;</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="4324032105-2">&gt;&gt;</span><span·class="w">··</span><span·class="c1">%%·Bin1·will·be·COPIED</span></code></pre><p>The·same·happens·if·you·insert·a·binary·into·an·Ets·table,·send·it·to·a·port
296 using·<a·href="../../erts-15.2.6/doc/html/erlang.html#port_command/2"><code·class="inline">erlang:port_command/2</code></a>,·or·pass·it·to296 using·<a·href="../../erts-15.2.6/doc/html/erlang.html#port_command/2"><code·class="inline">erlang:port_command/2</code></a>,·or·pass·it·to
297 <a·href="../../erts-15.2.6/doc/html/erl_nif.html#enif_inspect_binary">enif_inspect_binary</a>·in·a·NIF.</p><p>Matching·a·binary·will·also·cause·it·to·shrink·and·the·next·append·operation297 <a·href="../../erts-15.2.6/doc/html/erl_nif.html#enif_inspect_binary">enif_inspect_binary</a>·in·a·NIF.</p><p>Matching·a·binary·will·also·cause·it·to·shrink·and·the·next·append·operation
298 will·copy·the·binary·data:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5020597443-1">&lt;&lt;</span><span·class="n">Bin0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5020597443-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">298 will·copy·the·binary·data:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2472316749-1">&lt;&lt;</span><span·class="n">Bin0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2472316749-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">
299 </span><span·class="p"·data-group-id="5020597443-2">&lt;&lt;</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p">,</span><span·class="n">Z</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·8d49850cc4d6ebf1e7ef3ce62cb1c1169b10c8763e39f53786bfc1926b476072·...·]-2">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="w">299 </span><span·class="p"·data-group-id="2472316749-2">&lt;&lt;</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p">,</span><span·class="n">Z</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·e4cefdadd1ee0f10f8b558c67d4031265e7848a5c2f27c928211b93e55f7bd35·...·]-2">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="w">
300 </span><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5020597443-3">&lt;&lt;</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5020597443-3">&gt;&gt;</span><span·class="w">··</span><span·class="c1">%%·Bin1·will·be·COPIED</span></code></pre><p>The·reason·is·that·a·<a·href="binaryhandling.html#match_context">match·context</a>·contains·a300 </span><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2472316749-3">&lt;&lt;</span><span·class="n">Bin1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2472316749-3">&gt;&gt;</span><span·class="w">··</span><span·class="c1">%%·Bin1·will·be·COPIED</span></code></pre><p>The·reason·is·that·a·<a·href="binaryhandling.html#match_context">match·context</a>·contains·a
301 direct·pointer·to·the·binary·data.</p><p>If·a·process·simply·keeps·binaries·(either·in·&quot;loop·data&quot;·or·in·the·process301 direct·pointer·to·the·binary·data.</p><p>If·a·process·simply·keeps·binaries·(either·in·&quot;loop·data&quot;·or·in·the·process
302 dictionary),·the·garbage·collector·can·eventually·shrink·the·binaries.·If·only302 dictionary),·the·garbage·collector·can·eventually·shrink·the·binaries.·If·only
303 one·such·binary·is·kept,·it·will·not·be·shrunk.·If·the·process·later·appends·to303 one·such·binary·is·kept,·it·will·not·be·shrunk.·If·the·process·later·appends·to
304 a·binary·that·has·been·shrunk,·the·binary·object·will·be·reallocated·to·make304 a·binary·that·has·been·shrunk,·the·binary·object·will·be·reallocated·to·make
305 place·for·the·data·to·be·appended.</p><h2·id="matching-binaries"·class="section-heading">305 place·for·the·data·to·be·appended.</p><h2·id="matching-binaries"·class="section-heading">
306 ··<a·href="#matching-binaries"·class="hover-link">306 ··<a·href="#matching-binaries"·class="hover-link">
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119 ··<a·href="#introduction"·class="hover-link">119 ··<a·href="#introduction"·class="hover-link">
120 ····<i·class="ri-link-m"·aria-hidden="true"></i>120 ····<i·class="ri-link-m"·aria-hidden="true"></i>
121 ··</a>121 ··</a>
122 ··<span·class="text">Introduction</span>122 ··<span·class="text">Introduction</span>
123 </h2>123 </h2>
124 <p>The·complete·specification·for·the·bit·syntax·appears·in·the124 <p>The·complete·specification·for·the·bit·syntax·appears·in·the
125 <a·href="../../doc/system/expressions.html#bit-syntax-expressions">Reference·Manual</a>.</p><p>In·Erlang,·a·Bin·is·used·for·constructing·binaries·and·matching·binary·patterns.125 <a·href="../../doc/system/expressions.html#bit-syntax-expressions">Reference·Manual</a>.</p><p>In·Erlang,·a·Bin·is·used·for·constructing·binaries·and·matching·binary·patterns.
126 A·Bin·is·written·with·the·following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3216991573-1">&lt;&lt;</span><span·class="n">E1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E2</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·cla[·...·truncated·by·diffoscope;·len:·81,·SHA:·4faba83ec6cb64267f8ea7901eb4f49cfeb68b3baed1700add0488db16ab0f79·...·]-1">&gt;&gt;</span></code></pre><p>A·Bin·is·a·low-level·sequence·of·bits·or·bytes.·The·purpose·of·a·Bin·is·to126 A·Bin·is·written·with·the·following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2208818710-1">&lt;&lt;</span><span·class="n">E1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E2</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·cla[·...·truncated·by·diffoscope;·len:·81,·SHA:·cb512a5cc5521dc4fcd8ce5329828367b3a080b4ecad3d20e5095bb7168f7694·...·]-1">&gt;&gt;</span></code></pre><p>A·Bin·is·a·low-level·sequence·of·bits·or·bytes.·The·purpose·of·a·Bin·is·to
127 enable·construction·of·binaries:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9157402944-1">&lt;&lt;</span><span·class="n">E1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E2</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·cla[·...·truncated·by·diffoscope;·len:·582,·SHA:·8f96238ec33e4ec1894703080bcd9d7e4e103b01902b44238edb4162effafa04·...·]-1">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin</span></code></pre><p>Here,·<code·class="inline">Bin</code>·is·bound·and·the·elements·are·bound·or·unbound,·as·in·any·match.</p><p>A·Bin·does·not·need·to·consist·of·a·whole·number·of·bytes.</p><p>A·<em>bitstring</em>·is·a·sequence·of·zero·or·more·bits,·where·the·number·of·bits·does127 enable·construction·of·binaries:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5462563743-1">&lt;&lt;</span><span·class="n">E1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E2</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·cla[·...·truncated·by·diffoscope;·len:·582,·SHA:·af87aeb125806025e4cdcb42bc0334d3da483671deacf705781e579dac70534d·...·]-1">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin</span></code></pre><p>Here,·<code·class="inline">Bin</code>·is·bound·and·the·elements·are·bound·or·unbound,·as·in·any·match.</p><p>A·Bin·does·not·need·to·consist·of·a·whole·number·of·bytes.</p><p>A·<em>bitstring</em>·is·a·sequence·of·zero·or·more·bits,·where·the·number·of·bits·does
128 not·need·to·be·divisible·by·8.·If·the·number·of·bits·is·divisible·by·8,·the128 not·need·to·be·divisible·by·8.·If·the·number·of·bits·is·divisible·by·8,·the
129 bitstring·is·also·a·binary.</p><p>Each·element·specifies·a·certain·<em>segment</em>·of·the·bitstring.·A·segment·is·a·set129 bitstring·is·also·a·binary.</p><p>Each·element·specifies·a·certain·<em>segment</em>·of·the·bitstring.·A·segment·is·a·set
130 of·contiguous·bits·of·the·binary·(not·necessarily·on·a·byte·boundary).·The·first130 of·contiguous·bits·of·the·binary·(not·necessarily·on·a·byte·boundary).·The·first
131 element·specifies·the·initial·segment,·the·second·element·specifies·the131 element·specifies·the·initial·segment,·the·second·element·specifies·the
132 following·segment,·and·so·on.</p><p>The·following·examples·illustrate·how·binaries·are·constructed,·or·matched,·and132 following·segment,·and·so·on.</p><p>The·following·examples·illustrate·how·binaries·are·constructed,·or·matched,·and
133 how·elements·and·tails·are·specified.</p><h3·id="examples"·class="section-heading">133 how·elements·and·tails·are·specified.</p><h3·id="examples"·class="section-heading">
134 ··<a·href="#examples"·class="hover-link">134 ··<a·href="#examples"·class="hover-link">
135 ····<i·class="ri-link-m"·aria-hidden="true"></i>135 ····<i·class="ri-link-m"·aria-hidden="true"></i>
136 ··</a>136 ··</a>
137 ··<span·class="text">Examples</span>137 ··<span·class="text">Examples</span>
138 </h3>138 </h3>
139 <p><em>Example·1:</em>·A·binary·can·be·constructed·from·a·set·of·constants·or·a·string139 <p><em>Example·1:</em>·A·binary·can·be·constructed·from·a·set·of·constants·or·a·string
140 literal:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin11</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4767477587-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="4767477587-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">140 literal:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bin11</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2725604581-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="2725604581-1">&gt;&gt;</span><span·class="p">,</span><span·class="w">
141 </span><span·class="n">Bin12</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4767477587-2">&lt;&lt;</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="4767477587-2">&gt;&gt;</span></code></pre><p>This·gives·two·binaries·of·size·3,·with·the·following·evaluations:</p><ul><li><a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_list/1"><code·class="inline">binary_to_list(Bin11)</code></a>·evaluates·to·<code·class="inline">[1,·17,·42]</code>.</li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_list/1"><code·class="inline">binary_to_list(Bin12)</code></a>·evaluates·to·<code·class="inline">[97,·98,·99]</code>.</li></ul><p><em>Example·2:</em>Similarly,·a·binary·can·be·constructed·from·a·set·of·bound141 </span><span·class="n">Bin12</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2725604581-2">&lt;&lt;</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="2725604581-2">&gt;&gt;</span></code></pre><p>This·gives·two·binaries·of·size·3,·with·the·following·evaluations:</p><ul><li><a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_list/1"><code·class="inline">binary_to_list(Bin11)</code></a>·evaluates·to·<code·class="inline">[1,·17,·42]</code>.</li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_list/1"><code·class="inline">binary_to_list(Bin12)</code></a>·evaluates·to·<code·class="inline">[97,·98,·99]</code>.</li></ul><p><em>Example·2:</em>Similarly,·a·binary·can·be·constructed·from·a·set·of·bound
142 variables:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">142 variables:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">
143 </span><span·class="n">Bin2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6735532327-1">&lt;&lt;</span><span·class="n">A</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="p">,</span><span·class="w">·</span><span·class="n">C</span><span·class="p">:</span><span·class="mi">16</span><span·cla[·...·truncated·by·diffoscope;·len:·32,·SHA:·4ed65e6cd53d982e7c2a271460547936cbf2de59bd05fb008e125f6742f0e7ad·...·]-1">&gt;&gt;</span></code></pre><p>This·gives·a·binary·of·size·4.·Here,·a·<em>size·expression</em>·is·used·for·the143 </span><span·class="n">Bin2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0415534325-1">&lt;&lt;</span><span·class="n">A</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="p">,</span><span·class="w">·</span><span·class="n">C</span><span·class="p">:</span><span·class="mi">16</span><span·cla[·...·truncated·by·diffoscope;·len:·32,·SHA:·1f5f363a001718481fc4fbf9eab0c3990d62dbbaccdb20f25842573c62141a7f·...·]-1">&gt;&gt;</span></code></pre><p>This·gives·a·binary·of·size·4.·Here,·a·<em>size·expression</em>·is·used·for·the
144 variable·<code·class="inline">C</code>·to·specify·a·16-bits·segment·of·<code·class="inline">Bin2</code>.</p><p><a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_list/1"><code·class="inline">binary_to_list(Bin2)</code></a>·evaluates·to·<code·class="inline">[1,·17,·00,·42]</code>.</p><p><em>Example·3:</em>·A·Bin·can·also·be·used·for·matching.·<code·class="inline">D</code>,·<code·class="inline">E</code>,·and·<code·class="inline">F</code>·are·unbound144 variable·<code·class="inline">C</code>·to·specify·a·16-bits·segment·of·<code·class="inline">Bin2</code>.</p><p><a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_list/1"><code·class="inline">binary_to_list(Bin2)</code></a>·evaluates·to·<code·class="inline">[1,·17,·00,·42]</code>.</p><p><em>Example·3:</em>·A·Bin·can·also·be·used·for·matching.·<code·class="inline">D</code>,·<code·class="inline">E</code>,·and·<code·class="inline">F</code>·are·unbound
145 variables,·and·<code·class="inline">Bin2</code>·is·bound,·as·in·Example·2:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3574095706-1">&lt;&lt;</span><span·class="n">D</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class[·...·truncated·by·diffoscope;·len:·84,·SHA:·83aea0e92f34e176ee362ef97a1593b66cbd04979dcf45f7bf105589c03e84d2·...·]-1">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin2</span></code></pre><p>This·gives·<code·class="inline">D·=·273</code>,·<code·class="inline">E·=·00</code>,·and·F·binds·to·a·binary·of·size·1:145 variables,·and·<code·class="inline">Bin2</code>·is·bound,·as·in·Example·2:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3586783688-1">&lt;&lt;</span><span·class="n">D</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class[·...·truncated·by·diffoscope;·len:·84,·SHA:·5167c06c8af07685026817298fbefdf18a501ce7e887ec74f07f2aca3eec383b·...·]-1">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin2</span></code></pre><p>This·gives·<code·class="inline">D·=·273</code>,·<code·class="inline">E·=·00</code>,·and·F·binds·to·a·binary·of·size·1:
146 <code·class="inline">binary_to_list(F)·=·[42]</code>.</p><p><em>Example·4:</em>·The·following·is·a·more·elaborate·example·of·matching.·Here,146 <code·class="inline">binary_to_list(F)·=·[42]</code>.</p><p><em>Example·4:</em>·The·following·is·a·more·elaborate·example·of·matching.·Here,
147 <code·class="inline">Dgram</code>·is·bound·to·the·consecutive·bytes·of·an·IP·datagram·of·IP·protocol147 <code·class="inline">Dgram</code>·is·bound·to·the·consecutive·bytes·of·an·IP·datagram·of·IP·protocol
148 version·4.·The·ambition·is·to·extract·the·header·and·the·data·of·the·datagram:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5292228484-1">(</span><span·class="n">IP_VERSION</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="5292228484-1">)</span><span·class="p">.</span><span·class="w">148 version·4.·The·ambition·is·to·extract·the·header·and·the·data·of·the·datagram:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4127990176-1">(</span><span·class="n">IP_VERSION</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="4127990176-1">)</span><span·class="p">.</span><span·class="w">
149 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5292228484-2">(</span><span·class="n">IP_MIN_HDR_LEN</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="5292228484-2">)</span><span·class="p">.</span><span·class="w">149 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4127990176-2">(</span><span·class="n">IP_MIN_HDR_LEN</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="4127990176-2">)</span><span·class="p">.</span><span·class="w">
  
150 </span><span·class="n">DgramSize</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">byte_size</span><span·class="p"·data-group-id="5292228484-3">(</span><span·class="n">Dgram</span><span·class="p"·data-group-id="5292228484-3">)</span><span·class="p">,</span><span·class="w">150 </span><span·class="n">DgramSize</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">byte_size</span><span·class="p"·data-group-id="4127990176-3">(</span><span·class="n">Dgram</span><span·class="p"·data-group-id="4127990176-3">)</span><span·class="p">,</span><span·class="w">
151 </span><span·class="k">case</span><span·class="w">·</span><span·class="n">Dgram</span><span·class="w">·</span><span·class="k">of</span><span·class="w">151 </span><span·class="k">case</span><span·class="w">·</span><span·class="n">Dgram</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
152 ····</span><span·class="p"·data-group-id="5292228484-4">&lt;&lt;</span><span·class="o">?</span><span·class="n">IP_VERSION</span><span·class="p">:</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HLen</span><span·class="p">:</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SrvcType</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TotLen</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">152 ····</span><span·class="p"·data-group-id="4127990176-4">&lt;&lt;</span><span·class="o">?</span><span·class="n">IP_VERSION</span><span·class="p">:</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HLen</span><span·class="p">:</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SrvcType</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TotLen</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">
153 ······</span><span·class="n">ID</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Flgs</span><span·class="p">:</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FragOff</span><span·class="p">:</span><span·class="mi">13</span><span·class="p">,</span><span·class="w">153 ······</span><span·class="n">ID</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Flgs</span><span·class="p">:</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FragOff</span><span·class="p">:</span><span·class="mi">13</span><span·class="p">,</span><span·class="w">
154 ······</span><span·class="n">TTL</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Proto</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HdrChkSum</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">154 ······</span><span·class="n">TTL</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Proto</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HdrChkSum</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">
155 ······</span><span·class="n">SrcIP</span><span·class="p">:</span><span·class="mi">32</span><span·class="p">,</span><span·class="w">155 ······</span><span·class="n">SrcIP</span><span·class="p">:</span><span·class="mi">32</span><span·class="p">,</span><span·class="w">
156 ······</span><span·class="n">DestIP</span><span·class="p">:</span><span·class="mi">32</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RestDgram</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="5292228484-4">&gt;&gt;</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">HLen</span><span·class="o">&gt;=</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">*</span><span·class="n">HLen</span><span·class="o">=&lt;</span><span·class="n">DgramSize</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 ······</span><span·class="n">DestIP</span><span·class="p">:</span><span·class="mi">32</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RestDgram</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="4127990176-4">&gt;&gt;</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">HLen</span><span·class="o">&gt;=</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">*</span><span·class="n">HLen</span><span·class="o">=&lt;</span><span·class="n">DgramSize</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ········</span><span·class="n">OptsLen</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">*</span><span·class="p"·data-group-id="5292228484-5">(</span><span·class="n">HLen</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">?</span><span·class="n">IP_MIN_HDR_LEN</span><span·class="p"·data-group-id="5292228484-5">)</span><span·class="p">,</span><span·class="w">157 ········</span><span·class="n">OptsLen</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">*</span><span·class="p"·data-group-id="4127990176-5">(</span><span·class="n">HLen</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">?</span><span·class="n">IP_MIN_HDR_LEN</span><span·class="p"·data-group-id="4127990176-5">)</span><span·class="p">,</span><span·class="w">
158 ········</span><span·class="p"·data-group-id="5292228484-6">&lt;&lt;</span><span·class="n">Opts</span><span·class="p">:</span><span·class="n">OptsLen</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">Data</span><span·class="o">/</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·54,·SHA:·367543e42287dcfb16876228b8f42994bc143ee98963e79a72bb7fca7d7dd1a4·...·]-6">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RestDgram</span><span·class="p">,</span><span·class="w">158 ········</span><span·class="p"·data-group-id="4127990176-6">&lt;&lt;</span><span·class="n">Opts</span><span·class="p">:</span><span·class="n">OptsLen</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">Data</span><span·class="o">/</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·54,·SHA:·598b13767d9f6d89bf4def6ecd7b8ccd37d8cfcbadd7967c1d07965cc81e8440·...·]-6">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RestDgram</span><span·class="p">,</span><span·class="w">
159 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">159 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
160 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Here,·the·segment·corresponding·to·the·<code·class="inline">Opts</code>·variable·has·a·<em>type·modifier</em>,160 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Here,·the·segment·corresponding·to·the·<code·class="inline">Opts</code>·variable·has·a·<em>type·modifier</em>,
161 specifying·that·<code·class="inline">Opts</code>·is·to·bind·to·a·binary.·All·other·variables·have·the161 specifying·that·<code·class="inline">Opts</code>·is·to·bind·to·a·binary.·All·other·variables·have·the
162 default·type·equal·to·unsigned·integer.</p><p>An·IP·datagram·header·is·of·variable·length.·This·length·is·measured·in·the162 default·type·equal·to·unsigned·integer.</p><p>An·IP·datagram·header·is·of·variable·length.·This·length·is·measured·in·the
163 number·of·32-bit·words·and·is·given·in·the·segment·corresponding·to·<code·class="inline">HLen</code>.·The163 number·of·32-bit·words·and·is·given·in·the·segment·corresponding·to·<code·class="inline">HLen</code>.·The
164 minimum·value·of·<code·class="inline">HLen</code>·is·5.·It·is·the·segment·corresponding·to·<code·class="inline">Opts</code>·that·is164 minimum·value·of·<code·class="inline">HLen</code>·is·5.·It·is·the·segment·corresponding·to·<code·class="inline">Opts</code>·that·is
165 variable,·so·if·<code·class="inline">HLen</code>·is·equal·to·5,·<code·class="inline">Opts</code>·becomes·an·empty·binary.</p><p>The·tail·variables·<code·class="inline">RestDgram</code>·and·<code·class="inline">Data</code>·bind·to·binaries,·as·all·tail165 variable,·so·if·<code·class="inline">HLen</code>·is·equal·to·5,·<code·class="inline">Opts</code>·becomes·an·empty·binary.</p><p>The·tail·variables·<code·class="inline">RestDgram</code>·and·<code·class="inline">Data</code>·bind·to·binaries,·as·all·tail
Offset 218, 80 lines modifiedOffset 218, 80 lines modified
218 <p>This·section·describes·the·rules·for·constructing·binaries·using·the·bit·syntax.218 <p>This·section·describes·the·rules·for·constructing·binaries·using·the·bit·syntax.
219 Unlike·when·constructing·lists·or·tuples,·the·construction·of·a·binary·can·fail219 Unlike·when·constructing·lists·or·tuples,·the·construction·of·a·binary·can·fail
220 with·a·<code·class="inline">badarg</code>·exception.</p><p>There·can·be·zero·or·more·segments·in·a·binary·to·be·constructed.·The·expression220 with·a·<code·class="inline">badarg</code>·exception.</p><p>There·can·be·zero·or·more·segments·in·a·binary·to·be·constructed.·The·expression
221 <code·class="inline">&lt;&lt;&gt;&gt;</code>·constructs·a·zero·length·binary.</p><p>Each·segment·in·a·binary·can·consist·of·zero·or·more·bits.·There·are·no221 <code·class="inline">&lt;&lt;&gt;&gt;</code>·constructs·a·zero·length·binary.</p><p>Each·segment·in·a·binary·can·consist·of·zero·or·more·bits.·There·are·no
222 alignment·rules·for·individual·segments·of·type·<code·class="inline">integer</code>·and·<code·class="inline">float</code>.·For222 alignment·rules·for·individual·segments·of·type·<code·class="inline">integer</code>·and·<code·class="inline">float</code>.·For
223 binaries·and·bitstrings·without·size,·the·unit·specifies·the·alignment.·Since223 binaries·and·bitstrings·without·size,·the·unit·specifies·the·alignment.·Since
224 the·default·alignment·for·the·<code·class="inline">binary</code>·type·is·8,·the·size·of·a·binary·segment224 the·default·alignment·for·the·<code·class="inline">binary</code>·type·is·8,·the·size·of·a·binary·segment
225 must·be·a·multiple·of·8·bits,·that·is,·only·whole·bytes.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2161215737-1">&lt;&lt;</span><span·class="n">Bin</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">Bitstring</span><span·class="o">/</span><span·class="ss">bitstring</span><span·class="p"·data-group-id="216[·...·truncated·by·diffoscope;·len:·7,·SHA:·117ae8ff54bbfa3a8b1d1090ac3e7850291f7c82cccbee35039cb31a5cc13a74·...·]-1">&gt;&gt;</span></code></pre><p>The·variable·<code·class="inline">Bin</code>·must·contain·a·whole·number·of·bytes,·because·the·<code·class="inline">binary</code>225 must·be·a·multiple·of·8·bits,·that·is,·only·whole·bytes.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6763466142-1">&lt;&lt;</span><span·class="n">Bin</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">Bitstring</span><span·class="o">/</span><span·class="ss">bitstring</span><span·class="p"·data-group-id="676[·...·truncated·by·diffoscope;·len:·7,·SHA:·6325c2d6e962f42957b7c67c21e6d4abcbaa8644cb266178cb022c51aaa49fbf·...·]-1">&gt;&gt;</span></code></pre><p>The·variable·<code·class="inline">Bin</code>·must·contain·a·whole·number·of·bytes,·because·the·<code·class="inline">binary</code>
226 type·defaults·to·<code·class="inline">unit:8</code>.·A·<code·class="inline">badarg</code>·exception·is·generated·if·<code·class="inline">Bin</code>·consist226 type·defaults·to·<code·class="inline">unit:8</code>.·A·<code·class="inline">badarg</code>·exception·is·generated·if·<code·class="inline">Bin</code>·consist
227 of,·for·example,·17·bits.</p><p>The·<code·class="inline">Bitstring</code>·variable·can·consist·of·any·number·of·bits,·for·example,·0,·1,227 of,·for·example,·17·bits.</p><p>The·<code·class="inline">Bitstring</code>·variable·can·consist·of·any·number·of·bits,·for·example,·0,·1,
228 8,·11,·17,·42,·and·so·on.·This·is·because·the·default·<code·class="inline">unit</code>·for·bitstrings228 8,·11,·17,·42,·and·so·on.·This·is·because·the·default·<code·class="inline">unit</code>·for·bitstrings
229 is·1.</p><p>For·clarity,·it·is·recommended·not·to·change·the·unit·size·for·binaries.229 is·1.</p><p>For·clarity,·it·is·recommended·not·to·change·the·unit·size·for·binaries.
230 Instead,·use·<code·class="inline">binary</code>·when·you·need·byte·alignment·and·<code·class="inline">bitstring</code>·when·you·need230 Instead,·use·<code·class="inline">binary</code>·when·you·need·byte·alignment·and·<code·class="inline">bitstring</code>·when·you·need
231 bit·alignment.</p><p>The·following·example·successfully·constructs·a·bitstring·of·7·bits,·provided231 bit·alignment.</p><p>The·following·example·successfully·constructs·a·bitstring·of·7·bits,·provided
232 that·all·of·X·and·Y·are·integers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3566707553-1">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">Y</span><span·class="p">:</span><span·class="mi">6</span><span·class="p"·data-group-id="3566707553-1">&gt;&gt;</span></code></pre><p>As·mentioned·earlier,·segments·have·the·following·general·syntax:</p><p><code·class="inline">Value:Size/TypeSpecifierList</code></p><p>When·constructing·binaries,·<code·class="inline">Value</code>·and·<code·class="inline">Size</code>·can·be·any·Erlang·expression.232 that·all·of·X·and·Y·are·integers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2620547506-1">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">Y</span><span·class="p">:</span><span·class="mi">6</span><span·class="p"·data-group-id="2620547506-1">&gt;&gt;</span></code></pre><p>As·mentioned·earlier,·segments·have·the·following·general·syntax:</p><p><code·class="inline">Value:Size/TypeSpecifierList</code></p><p>When·constructing·binaries,·<code·class="inline">Value</code>·and·<code·class="inline">Size</code>·can·be·any·Erlang·expression.
233 However,·for·syntactical·reasons,·both·<code·class="inline">Value</code>·and·<code·class="inline">Size</code>·must·be·enclosed·in233 However,·for·syntactical·reasons,·both·<code·class="inline">Value</code>·and·<code·class="inline">Size</code>·must·be·enclosed·in
234 parenthesis·if·the·expression·consists·of·anything·more·than·a·single·literal·or234 parenthesis·if·the·expression·consists·of·anything·more·than·a·single·literal·or
235 a·variable.·The·following·gives·a·compiler·syntax·error:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7370359464-1">&lt;&lt;</span><span·class="n">X</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">8</span><span·class="p"·data-group-id="7370359464-1">&gt;&gt;</span></code></pre><p>This·expression·must·be·rewritten·into·the·following,·to·be·accepted·by·the235 a·variable.·The·following·gives·a·compiler·syntax·error:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2072247525-1">&lt;&lt;</span><span·class="n">X</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">8</span><span·class="p"·data-group-id="2072247525-1">&gt;&gt;</span></code></pre><p>This·expression·must·be·rewritten·into·the·following,·to·be·accepted·by·the
236 compiler:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1749870116-1">&lt;&lt;</span><span·class="p"·data-group-id="1749870116-2">(</span><span·class="n">X</span><span·class="o">+</span><span·class="mi">1</span><span·class="p"·data-group-id="1749870116-2">)</span><span·class="p">:</span><span·class="mi">8</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·7cee2a22f2acd4be6ef72125d832761e0ae421a53b97b0c15544ddac73399d8a·...·]-1">&gt;&gt;</span></code></pre><h3·id="including-literal-strings"·class="section-heading">236 compiler:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1024355285-1">&lt;&lt;</span><span·class="p"·data-group-id="1024355285-2">(</span><span·class="n">X</span><span·class="o">+</span><span·class="mi">1</span><span·class="p"·data-group-id="1024355285-2">)</span><span·class="p">:</span><span·class="mi">8</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·720818e15e381f83becbb62e5bacd4e6916458f499db72643b323f03d4a9f838·...·]-1">&gt;&gt;</span></code></pre><h3·id="including-literal-strings"·class="section-heading">
237 ··<a·href="#including-literal-strings"·class="hover-link">237 ··<a·href="#including-literal-strings"·class="hover-link">
238 ····<i·class="ri-link-m"·aria-hidden="true"></i>238 ····<i·class="ri-link-m"·aria-hidden="true"></i>
239 ··</a>239 ··</a>
240 ··<span·class="text">Including·Literal·Strings</span>240 ··<span·class="text">Including·Literal·Strings</span>
241 </h3>241 </h3>
242 <p>A·literal·string·can·be·written·instead·of·an·element:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6059555240-1">&lt;&lt;</span><span·class="s">&quot;hello&quot;</span><span·class="p"·data-group-id="6059555240-1">&gt;&gt;</span></code></pre><p>This·is·syntactic·sugar·for·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·d[·...·truncated·by·diffoscope;·len:·310,·SHA:·a7f33cb1b9290918be886ddf49d490e4a224359c2425f71aa7ecb6210e04ea18·...·]-1">&gt;&gt;</span></code></pre><h2·id="matching-binaries"·class="section-heading">242 <p>A·literal·string·can·be·written·instead·of·an·element:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1865128891-1">&lt;&lt;</span><span·class="s">&quot;hello&quot;</span><span·class="p"·data-group-id="1865128891-1">&gt;&gt;</span></code></pre><p>This·is·syntactic·sugar·for·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·d[·...·truncated·by·diffoscope;·len:·310,·SHA:·a3ee9f895caf161ef76ddf79d4d389497730ca546af9cd6611b6b82eaadccc14·...·]-1">&gt;&gt;</span></code></pre><h2·id="matching-binaries"·class="section-heading">
243 ··<a·href="#matching-binaries"·class="hover-link">243 ··<a·href="#matching-binaries"·class="hover-link">
244 ····<i·class="ri-link-m"·aria-hidden="true"></i>244 ····<i·class="ri-link-m"·aria-hidden="true"></i>
245 ··</a>245 ··</a>
246 ··<span·class="text">Matching·Binaries</span>246 ··<span·class="text">Matching·Binaries</span>
247 </h2>247 </h2>
248 <p>This·section·describes·the·rules·for·matching·binaries,·using·the·bit·syntax.</p><p>There·can·be·zero·or·more·segments·in·a·binary·pattern.·A·binary·pattern·can248 <p>This·section·describes·the·rules·for·matching·binaries,·using·the·bit·syntax.</p><p>There·can·be·zero·or·more·segments·in·a·binary·pattern.·A·binary·pattern·can
249 occur·wherever·patterns·are·allowed,·including·inside·other·patterns.·Binary249 occur·wherever·patterns·are·allowed,·including·inside·other·patterns.·Binary
250 patterns·cannot·be·nested.·The·pattern·<code·class="inline">&lt;&lt;&gt;&gt;</code>·matches·a·zero·length·binary.</p><p>Each·segment·in·a·binary·can·consist·of·zero·or·more·bits.·A·segment·of·type250 patterns·cannot·be·nested.·The·pattern·<code·class="inline">&lt;&lt;&gt;&gt;</code>·matches·a·zero·length·binary.</p><p>Each·segment·in·a·binary·can·consist·of·zero·or·more·bits.·A·segment·of·type
251 <code·class="inline">binary</code>·must·have·a·size·evenly·divisible·by·8·(or·divisible·by·the·unit·size,251 <code·class="inline">binary</code>·must·have·a·size·evenly·divisible·by·8·(or·divisible·by·the·unit·size,
252 if·the·unit·size·has·been·changed).·A·segment·of·type·<code·class="inline">bitstring</code>·has·no252 if·the·unit·size·has·been·changed).·A·segment·of·type·<code·class="inline">bitstring</code>·has·no
253 restrictions·on·the·size.·A·segment·of·type·<code·class="inline">float</code>·must·have·size·64·or·32.</p><p>As·mentioned·earlier,·segments·have·the·following·general·syntax:</p><p><code·class="inline">Value:Size/TypeSpecifierList</code></p><p>When·matching·<code·class="inline">Value</code>,·value·must·be·either·a·variable·or·an·integer,·or·a253 restrictions·on·the·size.·A·segment·of·type·<code·class="inline">float</code>·must·have·size·64·or·32.</p><p>As·mentioned·earlier,·segments·have·the·following·general·syntax:</p><p><code·class="inline">Value:Size/TypeSpecifierList</code></p><p>When·matching·<code·class="inline">Value</code>,·value·must·be·either·a·variable·or·an·integer,·or·a
254 floating·point·literal.·Expressions·are·not·allowed.</p><p><code·class="inline">Size</code>·must·be·a254 floating·point·literal.·Expressions·are·not·allowed.</p><p><code·class="inline">Size</code>·must·be·a
255 <a·href="../../doc/system/expressions.html#guard-expressions">guard·expression</a>,·which·can·use255 <a·href="../../doc/system/expressions.html#guard-expressions">guard·expression</a>,·which·can·use
256 literals·and·previously·bound·variables.·The·following·is·not·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="5132178419-1">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5132178419-2">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="n">N</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·173,·SHA:·0a6d959ce1ebefc5b05e75626dbebda1ca33bce404b0dfd7758fb13ce3124cc6·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">256 literals·and·previously·bound·variables.·The·following·is·not·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="3565741504-1">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3565741504-2">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="n">N</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·173,·SHA:·2a946607d5b556305f05300351242a47bee6c28b3e3c87673f3b0e66e6e6cd6a·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
257 ···</span><span·class="p"·data-group-id="5132178419-3">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">T</span><span·class="p"·data-group-id="5132178419-3">}</span><span·class="p">.</span></code></pre><p>The·two·occurrences·of·<code·class="inline">N</code>·are·not·related.·The·compiler·will·complain·that·the257 ···</span><span·class="p"·data-group-id="3565741504-3">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">T</span><span·class="p"·data-group-id="3565741504-3">}</span><span·class="p">.</span></code></pre><p>The·two·occurrences·of·<code·class="inline">N</code>·are·not·related.·The·compiler·will·complain·that·the
258 <code·class="inline">N</code>·in·the·size·field·is·unbound.</p><p>The·correct·way·to·write·this·example·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="8666718247-1">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="8666718247-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">258 <code·class="inline">N</code>·in·the·size·field·is·unbound.</p><p>The·correct·way·to·write·this·example·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="2549771202-1">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="2549771202-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
259 ···</span><span·class="p"·data-group-id="8666718247-2">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="n">N</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="8666718247-2">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p">,</span><span·class="w">259 ···</span><span·class="p"·data-group-id="2549771202-2">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="n">N</span><span·class="p">,</span><span·class="n">T</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="2549771202-2">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p">,</span><span·class="w">
260 ···</span><span·class="p"·data-group-id="8666718247-3">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">T</span><span·class="p"·data-group-id="8666718247-3">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Before·OTP·23,·<code·class="inline">Size</code>·was·restricted·to·be·an·integer·or·a·variable·bound·to260 ···</span><span·class="p"·data-group-id="2549771202-3">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">T</span><span·class="p"·data-group-id="2549771202-3">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Before·OTP·23,·<code·class="inline">Size</code>·was·restricted·to·be·an·integer·or·a·variable·bound·to
261 an·integer.</p></section><h3·id="binding-and-using-a-size-variable"·class="section-heading">261 an·integer.</p></section><h3·id="binding-and-using-a-size-variable"·class="section-heading">
262 ··<a·href="#binding-and-using-a-size-variable"·class="hover-link">262 ··<a·href="#binding-and-using-a-size-variable"·class="hover-link">
263 ····<i·class="ri-link-m"·aria-hidden="true"></i>263 ····<i·class="ri-link-m"·aria-hidden="true"></i>
264 ··</a>264 ··</a>
265 ··<span·class="text">Binding·and·Using·a·Size·Variable</span>265 ··<span·class="text">Binding·and·Using·a·Size·Variable</span>
266 </h3>266 </h3>
267 <p>There·is·one·exception·to·the·rule·that·a·variable·that·is·used·as·size·must·be267 <p>There·is·one·exception·to·the·rule·that·a·variable·that·is·used·as·size·must·be
268 previously·bound.·It·is·possible·to·match·and·bind·a·variable,·and·use·it·as·a268 previously·bound.·It·is·possible·to·match·and·bind·a·variable,·and·use·it·as·a
269 size·within·the·same·binary·pattern.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bar</span><span·class="p"·data-group-id="9524841070-1">(</span><span·class="p"·data-group-id="9524841070-2">&lt;&lt;</span><span·class="n">Sz</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">Payload</span><span·class="p">:</span><span·class="n">Sz</sp[·...·truncated·by·diffoscope;·len:·364,·SHA:·e3d384a89d49423acfbe9427f95be4ce7e62941b73f2311087f84bb3c65e3c83·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">269 size·within·the·same·binary·pattern.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bar</span><span·class="p"·data-group-id="2560630283-1">(</span><span·class="p"·data-group-id="2560630283-2">&lt;&lt;</span><span·class="n">Sz</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">Payload</span><span·class="p">:</span><span·class="n">Sz</sp[·...·truncated·by·diffoscope;·len:·364,·SHA:·94ee08119bdac5e0ad2e3e14589fb043af2f3930ce8ff8d631fc83e6a14af3c5·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
270 ···</span><span·class="p"·data-group-id="9524841070-3">{</span><span·class="n">Payload</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="9524841070-3">}</span><span·class="p">.</span></code></pre><p>Here·<code·class="inline">Sz</code>·is·bound·to·the·value·in·the·first·byte·of·the·binary.·<code·class="inline">Sz</code>·is·then 
271 used·at·the·number·of·bytes·to·match·out·as·a·binary.</p><p>Starting·in·OTP·23,·the·size·can·be·a·guard·expression:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bar</span><span·class="p"·data-group-id="1484959606-1">(</span><span·class="p"·data-group-id="1484959606-2">&lt;&lt;</span><span·class="n">Sz</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">Payload</span><span·class="p">:</span><span·class="p"·data-group-id="1484959606-3">(</span><span·class="p"·data-group-id="1484959606-4">(</span><span·class="n">Sz</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="1484959606-4">)</span><span·class="o">*</span><span·class="mi">8</span><span·class="p"·data-group-id="1484959606-3">)</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">Rest</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="1484959606-2">&gt;&gt;</span><span·class="p"·data-group-id="1484959606-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
272 ···</span><span·class="p"·data-group-id="1484959606-5">{</span><span·class="n">Payload</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="1484959606-5">}</span><span·class="p">.</span></code></pre><p>Here·<code·class="inline">Sz</code>·is·the·combined·size·of·[·...·truncated·by·diffoscope;·len:·46,·SHA:·d0b6d114708e778d0e39df8bdf4348dbe99c13881c34a8eaa4857ce97f752e5a·...·]270 ···</span><span·class="p"·data-group-id="2560630283-3">{</span><span·class="n">Payload</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="2560630283-3">}</span><span·class="p">.</span></code></pre><p>Here·<code·class="inline">Sz</code>·is·bound·to·the·value·in[·...·truncated·by·diffoscope;·len:·69,·SHA:·1083f3582748578c46c3ce7c90260d1ad254ccef243b474a07b0e4eba11c7f49·...·]
 271 used·at·the·number·of·bytes·to·match·out·as·a·binary.</p><p>Starting·in·OTP·23,·the·size·can·be·a·guard·expression:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bar</span><span·class="p"·data-group-id="9986254477-1">(</span><span·class="p"·data-group-id="9986254477-2">&lt;&lt;</span><span·class="n">Sz</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">Payload</span><span·class="p">:</span><span·class="p"·data-group-id="9986254477-3">(</span><span·class="p"·data-group-id="9986254477-4">(</span><span·class="n">Sz</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="9986254477-4">)</span><span·class="o">*</span><span·class="mi">8</span><span·class="p"·data-group-id="9986254477-3">)</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">Rest</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p"·data-group-id="9986254477-2">&gt;&gt;</span><span·class="p"·data-group-id="9986254477-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
 272 ···</span><span·class="p"·data-group-id="9986254477-5">{</span><span·class="n">Payload</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="9986254477-5">}</span><span·class="p">.</span></code></pre><p>Here·<code·class="inline">Sz</code>·is·the·combined·size·of·the·header·and·the·payload,·so·we·will·need·to
273 subtract·one·byte·to·get·the·size·of·the·payload.</p><h3·id="getting-the-rest-of-the-binary-or-bitstring"·class="section-heading">273 subtract·one·byte·to·get·the·size·of·the·payload.</p><h3·id="getting-the-rest-of-the-binary-or-bitstring"·class="section-heading">
274 ··<a·href="#getting-the-rest-of-the-binary-or-bitstring"·class="hover-link">274 ··<a·href="#getting-the-rest-of-the-binary-or-bitstring"·class="hover-link">
275 ····<i·class="ri-link-m"·aria-hidden="true"></i>275 ····<i·class="ri-link-m"·aria-hidden="true"></i>
276 ··</a>276 ··</a>
277 ··<span·class="text">Getting·the·Rest·of·the·Binary·or·Bitstring</span>277 ··<span·class="text">Getting·the·Rest·of·the·Binary·or·Bitstring</span>
278 </h3>278 </h3>
279 <p>To·match·out·the·rest·of·a·binary,·specify·a·binary·field·without·size:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="4969167685-1">(</span><span·class="p"·data-group-id="4969167685-2">&lt;&lt;</span><span·class="n">A</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">Rest</span><span·class="o">/</span><span·class="ss">binary</s[·...·truncated·by·diffoscope;·len:·784,·SHA:·99a756a351dd5d287226d4b469c9d6250251527662c3e7a6901063a2d71c3e19·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span></code></pre><p>There·are·no·restrictions·on·the·number·of·bits·in·the·tail.</p><h2·id="appending-to-a-binary"·class="section-heading">279 <p>To·match·out·the·rest·of·a·binary,·specify·a·binary·field·without·size:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="7509471830-1">(</span><span·class="p"·data-group-id="7509471830-2">&lt;&lt;</span><span·class="n">A</span><span·class="p">:</span><span·class="mi">8</span><span·class="p">,</span><span·class="n">Rest</span><span·class="o">/</span><span·class="ss">binary</s[·...·truncated·by·diffoscope;·len:·784,·SHA:·edd977356f3f706c02072614d899085fcdf72840d2ffa1506fcdfe3c63d8afb4·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span></code></pre><p>There·are·no·restrictions·on·the·number·of·bits·in·the·tail.</p><h2·id="appending-to-a-binary"·class="section-heading">
280 ··<a·href="#appending-to-a-binary"·class="hover-link">280 ··<a·href="#appending-to-a-binary"·class="hover-link">
281 ····<i·class="ri-link-m"·aria-hidden="true"></i>281 ····<i·class="ri-link-m"·aria-hidden="true"></i>
282 ··</a>282 ··</a>
283 ··<span·class="text">Appending·to·a·Binary</span>283 ··<span·class="text">Appending·to·a·Binary</span>
284 </h2>284 </h2>
285 <p>Appending·to·a·binary·in·an·efficient·way·can·be·done·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="6405412065-1">(</span><span·class="n">T</span><span·class="p"·data-group-id="6405412065-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">285 <p>Appending·to·a·binary·in·an·efficient·way·can·be·done·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="2144323341-1">(</span><span·class="n">T</span><span·class="p"·data-group-id="2144323341-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
286 ····</span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="6405412065-2">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6405412065-3">&lt;&lt;</span><span·class="p"·data-group-id="6405412065-3">&gt;&gt;</span><span·class="p"·data-group-id="6405412065-2">)</span><span·class="p">.</span><span·class="w">286 ····</span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="2144323341-2">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2144323341-3">&lt;&lt;</span><span·class="p"·data-group-id="2144323341-3">&gt;&gt;</span><span·class="p"·data-group-id="2144323341-2">)</span><span·class="p">.</span><span·class="w">
  
287 </span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="6405412065-4">(</span><span·class="p"·data-group-id="6405412065-5">[</span><span·class="p"·data-group-id="6405412065-6">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p">,</span><span·class="n">Z</span><span·cl[·...·truncated·by·diffoscope;·len:·309,·SHA:·86273c09a1c3568494e2ea450e6fc50021c7cf0ec420aced3c9250fa70967fcb·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">287 </span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="2144323341-4">(</span><span·class="p"·data-group-id="2144323341-5">[</span><span·class="p"·data-group-id="2144323341-6">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p">,</span><span·class="n">Z</span><span·cl[·...·truncated·by·diffoscope;·len:·309,·SHA:·479766f755fee30b690793c43b0a863f9d2ab6665ea29ac54b112d4aa3fef4a6·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
288 ····</span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="6405412065-7">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6405412065-8">&lt;&lt;</span><span·class="n">Acc</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·373,·SHA:·c8c7c1395eae8c096b5f242ee5e20714cfb862f0325f983cf782c719b821fe90·...·]-7">)</span><span·class="p">;</span><span·class="w">288 ····</span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="2144323341-7">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2144323341-8">&lt;&lt;</span><span·class="n">Acc</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·373,·SHA:·4a91c6bc0cb512d4800bb73c2a023fbc0cfd30ddccb9d536c77e89e95e609f42·...·]-7">)</span><span·class="p">;</span><span·class="w">
289 </span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="6405412065-9">(</span><span·class="p"·data-group-id="6405412065-10">[</span><span·class="p"·data-group-id="6405412065-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="6405412065-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">289 </span><span·class="nf">triples_to_bin</span><span·class="p"·data-group-id="2144323341-9">(</span><span·class="p"·data-group-id="2144323341-10">[</span><span·class="p"·data-group-id="2144323341-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="2144323341-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
290 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre>290 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre>
291 </div>291 </div>
  
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148 external·program,·if·it·is·written·properly).</p><p>The·port·is·created·using·the·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>·with148 external·program,·if·it·is·written·properly).</p><p>The·port·is·created·using·the·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>·with
149 <code·class="inline">{spawn,ExtPrg}</code>·as·the·first·argument.·The·string·<code·class="inline">ExtPrg</code>·is·the·name·of·the149 <code·class="inline">{spawn,ExtPrg}</code>·as·the·first·argument.·The·string·<code·class="inline">ExtPrg</code>·is·the·name·of·the
150 external·program,·including·any·command·line·arguments.·The·second·argument·is·a150 external·program,·including·any·command·line·arguments.·The·second·argument·is·a
151 list·of·options,·in·this·case·only·<code·class="inline">{packet,2}</code>.·This·option·says·that·a·2·byte151 list·of·options,·in·this·case·only·<code·class="inline">{packet,2}</code>.·This·option·says·that·a·2·byte
152 length·indicator·is·to·be·used·to·simplify·the·communication·between·C·and152 length·indicator·is·to·be·used·to·simplify·the·communication·between·C·and
153 Erlang.·The·Erlang·port·automatically·adds·the·length·indicator,·but·this·must153 Erlang.·The·Erlang·port·automatically·adds·the·length·indicator,·but·this·must
154 be·done·explicitly·in·the·external·C·program.</p><p>The·process·is·also·set·to·trap·exits,·which·enables·detection·of·failure·of·the154 be·done·explicitly·in·the·external·C·program.</p><p>The·process·is·also·set·to·trap·exits,·which·enables·detection·of·failure·of·the
155 external·program:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6349733305-1">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="6349733305-1">)</span><span·class="p">.</span><span·class="w">155 external·program:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7213702023-1">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="7213702023-1">)</span><span·class="p">.</span><span·class="w">
156 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6349733305-2">(</span><span·class="p"·data-group-id="6349733305-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·f8d6cd44f93a8e6cf36c9f57f36f03dc171d541073362a4c15ff6e2720fdc822·...·]-2">)</span><span·class="p">.</span><span·class="w">156 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7213702023-2">(</span><span·class="p"·data-group-id="7213702023-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·d0177b1961729d9b24fdc18e84ccfa123978aabd33c505296d5a4604ce242e03·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
157 </span><span·class="nf">start</span><span·class="p"·data-group-id="6349733305-4">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="6349733305-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">start</span><span·class="p"·data-group-id="7213702023-4">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="7213702023-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ··</span><span·class="nf">spawn</span><span·class="p"·data-group-id="6349733305-5">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6349733305-6">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·1a6d769b0a1159f14b2806822c5f660eba363a95cb11e190d906ded0e9ad69ab·...·]-5">)</span><span·class="p">.</span><span·class="w">158 ··</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7213702023-5">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7213702023-6">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·6b00fbb41f1c7b121eefd5c52e2853d26927ba058db270e7099a1b3fc2dff08f·...·]-5">)</span><span·class="p">.</span><span·class="w">
  
159 </span><span·class="nf">init</span><span·class="p"·data-group-id="6349733305-7">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="6349733305-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 </span><span·class="nf">init</span><span·class="p"·data-group-id="7213702023-7">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="7213702023-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ··</span><span·class="nf">register</span><span·class="p"·data-group-id="6349733305-8">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6349733305-9">(</span><span·class="p"·data-group-id="6349733305-9">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·4a13bffdcec57d8747424fea50d55b0bf1e9fec0f43bace8be0fdbd661bb6e67·...·]-8">)</span><span·class="p">,</span><span·class="w">160 ··</span><span·class="nf">register</span><span·class="p"·data-group-id="7213702023-8">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="7213702023-9">(</span><span·class="p"·data-group-id="7213702023-9">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·50df303882e0b1ae6fb248919ae58ff9ebf1252fda1e2d9999b51e6ea42558c1·...·]-8">)</span><span·class="p">,</span><span·class="w">
161 ··</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="6349733305-10">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6349733305-10">)</span><span·class="p">,</span><span·class="w">161 ··</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="7213702023-10">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="7213702023-10">)</span><span·class="p">,</span><span·class="w">
162 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="6349733305-11">(</span><span·class="p"·data-group-id="6349733305-12">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="6349733305-12">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·389,·SHA:·c0f01dbd110b7621f28afe77aa70b594103ee738359db9af22f696e4565b88ca·...·]-11">)</span><span·class="p">,</span><span·class="w">162 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="7213702023-11">(</span><span·class="p"·data-group-id="7213702023-12">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="7213702023-12">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·389,·SHA:·ff3fa8e3de0bd4326f0ab36ca790cd519993b428c9ecd54b02c7c8a6f558588c·...·]-11">)</span><span·class="p">,</span><span·class="w">
163 ··</span><span·class="nf">loop</span><span·class="p"·data-group-id="6349733305-15">(</span><span·class="n">Port</span><span·class="p"·data-group-id="6349733305-15">)</span><span·class="p">.</span></code></pre><p>Now·<code·class="inline">complex1:foo/1</code>·and·<code·class="inline">complex1:bar/1</code>·can·be·implemented.·Both·send·a163 ··</span><span·class="nf">loop</span><span·class="p"·data-group-id="7213702023-15">(</span><span·class="n">Port</span><span·class="p"·data-group-id="7213702023-15">)</span><span·class="p">.</span></code></pre><p>Now·<code·class="inline">complex1:foo/1</code>·and·<code·class="inline">complex1:bar/1</code>·can·be·implemented.·Both·send·a
164 message·to·the·<code·class="inline">complex</code>·process·and·receive·the·following·replies:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="3708378133-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="3708378133-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">164 message·to·the·<code·class="inline">complex</code>·process·and·receive·the·following·replies:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="6193840627-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="6193840627-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
165 ··</span><span·class="nf">call_port</span><span·class="p"·data-group-id="3708378133-2">(</span><span·class="p"·data-group-id="3708378133-3">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="3708378133-3">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·12f9a0582552f13e0b8c2c8891c4b3d34526cafa81dcf9420c0f6c0fb804605f·...·]-2">)</span><span·class="p">.</span><span·class="w">165 ··</span><span·class="nf">call_port</span><span·class="p"·data-group-id="6193840627-2">(</span><span·class="p"·data-group-id="6193840627-3">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="6193840627-3">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·acade72173a48c16a6469ebcdef990ce4caa359f0a4acd27d06a851f3df946c7·...·]-2">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="nf">bar</span><span·class="p"·data-group-id="3708378133-4">(</span><span·class="n">Y</span><span·class="p"·data-group-id="3708378133-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">166 </span><span·class="nf">bar</span><span·class="p"·data-group-id="6193840627-4">(</span><span·class="n">Y</span><span·class="p"·data-group-id="6193840627-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
167 ··</span><span·class="nf">call_port</span><span·class="p"·data-group-id="3708378133-5">(</span><span·class="p"·data-group-id="3708378133-6">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="3708378133-6">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·12f9a0582552f13e0b8c2c8891c4b3d34526cafa81dcf9420c0f6c0fb804605f·...·]-5">)</span><span·class="p">.</span><span·class="w">167 ··</span><span·class="nf">call_port</span><span·class="p"·data-group-id="6193840627-5">(</span><span·class="p"·data-group-id="6193840627-6">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6193840627-6">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·acade72173a48c16a6469ebcdef990ce4caa359f0a4acd27d06a851f3df946c7·...·]-5">)</span><span·class="p">.</span><span·class="w">
  
168 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="3708378133-7">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="3708378133-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">168 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="6193840627-7">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="6193840627-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
169 ··</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3708378133-8">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="3708378133-9">(</span><span·class="p"·data-group-id="3708378133-9">)</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·793294c40f40a9248ca5c42990f09685efa93cad767919cf5699450deab45f25·...·]-8">}</span><span·class="p">,</span><span·class="w">169 ··</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6193840627-8">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6193840627-9">(</span><span·class="p"·data-group-id="6193840627-9">)</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·f7b3b3a1350b469d2c43b8cf594bd4cee063900188d8b92adf59ea3793099fb2·...·]-8">}</span><span·class="p">,</span><span·class="w">
170 ··</span><span·class="k">receive</span><span·class="w">170 ··</span><span·class="k">receive</span><span·class="w">
171 ····</span><span·class="p"·data-group-id="3708378133-10">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="3708378133-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 ····</span><span·class="p"·data-group-id="6193840627-10">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="6193840627-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ······</span><span·class="n">Result</span><span·class="w">172 ······</span><span·class="n">Result</span><span·class="w">
173 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">complex</code>·process·does·the·following:</p><ul><li>Encodes·the·message·into·a·sequence·of·bytes.</li><li>Sends·it·to·the·port.</li><li>Waits·for·a·reply.</li><li>Decodes·the·reply.</li><li>Sends·it·back·to·the·caller:</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="7512688232-1">(</span><span·class="n">Port</span><span·class="p"·data-group-id="7512688232-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">complex</code>·process·does·the·following:</p><ul><li>Encodes·the·message·into·a·sequence·of·bytes.</li><li>Sends·it·to·the·port.</li><li>Waits·for·a·reply.</li><li>Decodes·the·reply.</li><li>Sends·it·back·to·the·caller:</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="4803496721-1">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4803496721-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ··</span><span·class="k">receive</span><span·class="w">174 ··</span><span·class="k">receive</span><span·class="w">
175 ····</span><span·class="p"·data-group-id="7512688232-2">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7512688232-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 ····</span><span·class="p"·data-group-id="4803496721-2">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="4803496721-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ······</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7512688232-3">{</span><span·class="nf">self</span><span·class="p"·data-group-id="7512688232-4">(</span><span·class="p"·data-group-id="7512688232-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7512688232-5">{</span[·...·truncated·by·diffoscope;·len:·336,·SHA:·85e936f93f7ed62f9cb51011461e89af848435f0d53bcc7b433f75a847a9e7c6·...·]-3">}</span><span·class="p">,</span><span·class="w">176 ······</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4803496721-3">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4803496721-4">(</span><span·class="p"·data-group-id="4803496721-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4803496721-5">{</span[·...·truncated·by·diffoscope;·len:·336,·SHA:·0763e50b0cad90b69f116cef6d69720a2e5cd569b54c0a6160933235fcf1b44b·...·]-3">}</span><span·class="p">,</span><span·class="w">
177 ······</span><span·class="k">receive</span><span·class="w">177 ······</span><span·class="k">receive</span><span·class="w">
178 ········</span><span·class="p"·data-group-id="7512688232-7">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7512688232-8">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·92e0fa34e2c6e35539c55cd536741c9ca912cf67c67624cf4f2328340693143b·...·]-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 ········</span><span·class="p"·data-group-id="4803496721-7">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4803496721-8">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·ae882fdb441b69750032670162da8d4f68ecdbeb5fbda8ccb86d17e2d79b8d53·...·]-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ··········</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7512688232-9">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="7512688232-10">(</span><span·class="n">Data</span><span·class="p"·data-group-id="7512688232-10[·...·truncated·by·diffoscope;·len:·51,·SHA:·0e7c4741a76befc7b8a0b73d09ef8b39ddcef12da2269c4556461ae83ae1e62a·...·]-9">}</span><span·class="w">179 ··········</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4803496721-9">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="4803496721-10">(</span><span·class="n">Data</span><span·class="p"·data-group-id="4803496721-10[·...·truncated·by·diffoscope;·len:·51,·SHA:·4478708ac392d3c2837d00a460e3ca744a0848bde5b83cacdbe98751b14bb343·...·]-9">}</span><span·class="w">
180 ······</span><span·class="k">end</span><span·class="p">,</span><span·class="w">180 ······</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
181 ······</span><span·class="nf">loop</span><span·class="p"·data-group-id="7512688232-11">(</span><span·class="n">Port</span><span·class="p"·data-group-id="7512688232-11">)</span><span·class="w">181 ······</span><span·class="nf">loop</span><span·class="p"·data-group-id="4803496721-11">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4803496721-11">)</span><span·class="w">
182 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Assuming·that·both·the·arguments·and·the·results·from·the·C·functions·are·less182 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Assuming·that·both·the·arguments·and·the·results·from·the·C·functions·are·less
183 than·256,·a·simple·encoding/decoding·scheme·is·employed.·In·this·scheme,·<code·class="inline">foo</code>183 than·256,·a·simple·encoding/decoding·scheme·is·employed.·In·this·scheme,·<code·class="inline">foo</code>
184 is·represented·by·byte·1,·<code·class="inline">bar</code>·is·represented·by·2,·and·the·argument/result·is184 is·represented·by·byte·1,·<code·class="inline">bar</code>·is·represented·by·2,·and·the·argument/result·is
185 represented·by·a·single·byte·as·well:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">encode</span><span·class="p"·data-group-id="1574452826-1">(</span><span·class="p"·data-group-id="1574452826-2">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="1574452826-2">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·ed80c11a9fd95f2d3edf5f83517528ed9fc01989d02b263df1ae20e26ffab54d·...·]-3">]</span><span·class="p">;</span><span·class="w">185 represented·by·a·single·byte·as·well:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">encode</span><span·class="p"·data-group-id="6305571437-1">(</span><span·class="p"·data-group-id="6305571437-2">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="6305571437-2">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·5a2f5e496184816e932f8228b566882007b8c3e83774d010a1903629c4a19d5b·...·]-3">]</span><span·class="p">;</span><span·class="w">
186 </span><span·class="nf">encode</span><span·class="p"·data-group-id="1574452826-4">(</span><span·class="p"·data-group-id="1574452826-5">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="1574452826-5">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·74786c6c6dfac20ee602cf462434efe5517fb0042aca88fef234d2dc72d380b0·...·]-6">]</span><span·class="p">.</span><span·class="w">186 </span><span·class="nf">encode</span><span·class="p"·data-group-id="6305571437-4">(</span><span·class="p"·data-group-id="6305571437-5">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6305571437-5">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·f9b00a2eb1187d1a41a0d7a67562cfd56667feb2b5a9bc79d9db65df69f98861·...·]-6">]</span><span·class="p">.</span><span·class="w">
  
187 </span><span·class="nf">decode</span><span·class="p"·data-group-id="1574452826-7">(</span><span·class="p"·data-group-id="1574452826-8">[</span><span·class="n">Int</span><span·class="p"·data-group-id="1574452826-8">]</span><span·class="p"·data-group-id="1574452826-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><p>The·resulting·Erlang·program,·including·functionality·for·stopping·the·port·and187 </span><span·class="nf">decode</span><span·class="p"·data-group-id="6305571437-7">(</span><span·class="p"·data-group-id="6305571437-8">[</span><span·class="n">Int</span><span·class="p"·data-group-id="6305571437-8">]</span><span·class="p"·data-group-id="6305571437-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><p>The·resulting·Erlang·program,·including·functionality·for·stopping·the·port·and
188 detecting·port·failures,·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8739595775-1">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="8739595775-1">)</span><span·class="p">.</span><span·class="w">188 detecting·port·failures,·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0504072462-1">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="0504072462-1">)</span><span·class="p">.</span><span·class="w">
189 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8739595775-2">(</span><span·class="p"·data-group-id="8739595775-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·48186a92698712ac3daae7085c1296813c5fac64b8f79288b96180869c2f9638·...·]-2">)</span><span·class="p">.</span><span·class="w">189 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0504072462-2">(</span><span·class="p"·data-group-id="0504072462-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·eb1653474a55b9faf776ed9800718e8fada3b62b8034e1337758a187d9f87b05·...·]-2">)</span><span·class="p">.</span><span·class="w">
190 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8739595775-4">(</span><span·class="p"·data-group-id="8739595775-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·69c45b2a0ff2e31d5c061c133300aed18862f6565261a9862f930e71dcff03b1·...·]-4">)</span><span·class="p">.</span><span·class="w">190 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0504072462-4">(</span><span·class="p"·data-group-id="0504072462-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·7e32fda39bbd09a33748cf985b84c4682efb3d2a4b0f03c72227007d74771fe7·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
191 </span><span·class="nf">start</span><span·class="p"·data-group-id="8739595775-6">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="8739595775-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 </span><span·class="nf">start</span><span·class="p"·data-group-id="0504072462-6">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="0504072462-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="8739595775-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-8">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·3a0e65fe9cbc099fea0106e5e24b6ce3b5d64879ba3b3e6d15c4cc6303ceb618·...·]-7">)</span><span·class="p">.</span><span·class="w">192 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="0504072462-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-8">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·760dfbe87231adcd70bc850f5cb896479119530c559442106ccd9a2088602c84·...·]-7">)</span><span·class="p">.</span><span·class="w">
193 </span><span·class="nf">stop</span><span·class="p"·data-group-id="8739595775-9">(</span><span·class="p"·data-group-id="8739595775-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 </span><span·class="nf">stop</span><span·class="p"·data-group-id="0504072462-9">(</span><span·class="p"·data-group-id="0504072462-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">194 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">
  
195 </span><span·class="nf">foo</span><span·class="p"·data-group-id="8739595775-10">(</span><span·class="n">X</span><span·class="p"·data-group-id="8739595775-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">195 </span><span·class="nf">foo</span><span·class="p"·data-group-id="0504072462-10">(</span><span·class="n">X</span><span·class="p"·data-group-id="0504072462-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
196 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="8739595775-11">(</span><span·class="p"·data-group-id="8739595775-12">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="8739595775-12">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·6609c1aaf280ce153b6ac6691a2a470e8fb176a3d9683e38fcffa574eb40919a·...·]-11">)</span><span·class="p">.</span><span·class="w">196 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="0504072462-11">(</span><span·class="p"·data-group-id="0504072462-12">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="0504072462-12">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·dae1fc7a40a2c8d381e6d14e131764b1b07f1559f4f965097b3d25163724c806·...·]-11">)</span><span·class="p">.</span><span·class="w">
197 </span><span·class="nf">bar</span><span·class="p"·data-group-id="8739595775-13">(</span><span·class="n">Y</span><span·class="p"·data-group-id="8739595775-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">197 </span><span·class="nf">bar</span><span·class="p"·data-group-id="0504072462-13">(</span><span·class="n">Y</span><span·class="p"·data-group-id="0504072462-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
198 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="8739595775-14">(</span><span·class="p"·data-group-id="8739595775-15">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8739595775-15">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·6609c1aaf280ce153b6ac6691a2a470e8fb176a3d9683e38fcffa574eb40919a·...·]-14">)</span><span·class="p">.</span><span·class="w">198 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="0504072462-14">(</span><span·class="p"·data-group-id="0504072462-15">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="0504072462-15">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·dae1fc7a40a2c8d381e6d14e131764b1b07f1559f4f965097b3d25163724c806·...·]-14">)</span><span·class="p">.</span><span·class="w">
  
199 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="8739595775-16">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="8739595775-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">199 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="0504072462-16">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="0504072462-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
200 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-17">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8739595775-18">(</span><span·class="p"·data-group-id="8739595775-18">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·3704e4b02f12455d077bdf22eae3a47a1a4b8bc18cbdfc4ce6274ea505ff71dd·...·]-17">}</span><span·class="p">,</span><span·class="w">200 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-17">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="0504072462-18">(</span><span·class="p"·data-group-id="0504072462-18">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·c6b894da88c1468181ec75aeac69aece7fa2510a3278ea2f0b8c3e1ee1e630fd·...·]-17">}</span><span·class="p">,</span><span·class="w">
201 ····</span><span·class="k">receive</span><span·class="w">201 ····</span><span·class="k">receive</span><span·class="w">
202 »       </span><span·class="p"·data-group-id="8739595775-19">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="8739595775-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">202 »       </span><span·class="p"·data-group-id="0504072462-19">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="0504072462-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
203 »       ····</span><span·class="n">Result</span><span·class="w">203 »       ····</span><span·class="n">Result</span><span·class="w">
204 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">204 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
205 </span><span·class="nf">init</span><span·class="p"·data-group-id="8739595775-20">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="8739595775-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 </span><span·class="nf">init</span><span·class="p"·data-group-id="0504072462-20">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="0504072462-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="8739595775-21">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8739595775-22">(</span><span·class="p"·data-group-id="8739595775-22">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·8f2313ad5e3541bbcb1afeffe25d07618d858d9ab61169c9de27d3f923059eab·...·]-21">)</span><span·class="p">,</span><span·class="w">206 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="0504072462-21">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="0504072462-22">(</span><span·class="p"·data-group-id="0504072462-22">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·d4e78ba7c8a0e714b0b19fe4e2a87286d3496b827e25920770dc32279e65c4e2·...·]-21">)</span><span·class="p">,</span><span·class="w">
207 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="8739595775-23">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="8739595775-23">)</span><span·class="p">,</span><span·class="w">207 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="0504072462-23">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="0504072462-23">)</span><span·class="p">,</span><span·class="w">
208 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="8739595775-24">(</span><span·class="p"·data-group-id="8739595775-25">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="8739595775-25">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·389,·SHA:·47fea4f0a4b8cc34fd42e12697e39c6b5019671b653fee8ad93bb10bc4829560·...·]-24">)</span><span·class="p">,</span><span·class="w">208 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="0504072462-24">(</span><span·class="p"·data-group-id="0504072462-25">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="0504072462-25">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·389,·SHA:·eea43d5313ba513ee826cef8ff6be689b07540b7482c8da466c8982bcaf386ca·...·]-24">)</span><span·class="p">,</span><span·class="w">
209 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8739595775-28">(</span><span·class="n">Port</span><span·class="p"·data-group-id="8739595775-28">)</span><span·class="p">.</span><span·class="w">209 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="0504072462-28">(</span><span·class="n">Port</span><span·class="p"·data-group-id="0504072462-28">)</span><span·class="p">.</span><span·class="w">
  
210 </span><span·class="nf">loop</span><span·class="p"·data-group-id="8739595775-29">(</span><span·class="n">Port</span><span·class="p"·data-group-id="8739595775-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 </span><span·class="nf">loop</span><span·class="p"·data-group-id="0504072462-29">(</span><span·class="n">Port</span><span·class="p"·data-group-id="0504072462-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ····</span><span·class="k">receive</span><span·class="w">211 ····</span><span·class="k">receive</span><span·class="w">
212 »       </span><span·class="p"·data-group-id="8739595775-30">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="8739595775-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">212 »       </span><span·class="p"·data-group-id="0504072462-30">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="0504072462-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
213 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-31">{</span><span·class="nf">self</span><span·class="p"·data-group-id="8739595775-32">(</span><span·class="p"·data-group-id="8739595775-32">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-33">{</[·...·truncated·by·diffoscope;·len:·343,·SHA:·df8995b5e28e0fce550587ba44063cb4ce8ff30a8c82195df8836ba424e2c843·...·]-31">}</span><span·class="p">,</span><span·class="w">213 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-31">{</span><span·class="nf">self</span><span·class="p"·data-group-id="0504072462-32">(</span><span·class="p"·data-group-id="0504072462-32">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-33">{</[·...·truncated·by·diffoscope;·len:·343,·SHA:·a61c851d53d25a7d6d6d53c00d17fce118d39b49d4a1201395694898e84352bf·...·]-31">}</span><span·class="p">,</span><span·class="w">
214 »       ····</span><span·class="k">receive</span><span·class="w">214 »       ····</span><span·class="k">receive</span><span·class="w">
215 »       »       </span><span·class="p"·data-group-id="8739595775-35">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-36">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·4bb496ea83371bf2c363eb17b7a48239818c5cb25c0fb361a746bd06192abf3a·...·]-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">215 »       »       </span><span·class="p"·data-group-id="0504072462-35">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-36">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·1e03f0ec62774b269305c5db7eb62271448f4c1e451f4ccc205826a1f7b95ec5·...·]-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
216 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-37">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="8739595775-38">(</span><span·class="n">Data</span><span·class="p"·data-group-id="8739595775-3[·...·truncated·by·diffoscope;·len:·52,·SHA:·dbcbb2f2097fb3d1b142add4707043fdcc40cba5779918308cd9b841ca62a92f·...·]-37">}</span><span·class="w">216 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-37">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="0504072462-38">(</span><span·class="n">Data</span><span·class="p"·data-group-id="0504072462-3[·...·truncated·by·diffoscope;·len:·52,·SHA:·fd93e30db600a995a3781836eadd403a368ff372ea10d66dfe9b1e4a571028e0·...·]-37">}</span><span·class="w">
217 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">217 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
218 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8739595775-39">(</span><span·class="n">Port</span><span·class="p"·data-group-id="8739595775-39">)</span><span·class="p">;</span><span·class="w">218 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="0504072462-39">(</span><span·class="n">Port</span><span·class="p"·data-group-id="0504072462-39">)</span><span·class="p">;</span><span·class="w">
219 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8739595775-40">{</span><span·class="nf">self</span><span·class="p"·data-group-id="8739595775-41">(</span><span·class="p"·data-group-id="8739595775-41">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·e40dbe28903c16e86a25826efbaa28a18aa5846fb5ea414cf36e3207f69ae26d·...·]-40">}</span><span·class="p">,</span><span·class="w">220 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0504072462-40">{</span><span·class="nf">self</span><span·class="p"·data-group-id="0504072462-41">(</span><span·class="p"·data-group-id="0504072462-41">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·ca4431d24e0362a11658ff784c04d48d4b2c6cc65bcd588f66f91ab104062c59·...·]-40">}</span><span·class="p">,</span><span·class="w">
221 »       ····</span><span·class="k">receive</span><span·class="w">221 »       ····</span><span·class="k">receive</span><span·class="w">
222 »       »       </span><span·class="p"·data-group-id="8739595775-42">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="8739595775-42">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 »       »       </span><span·class="p"·data-group-id="0504072462-42">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="0504072462-42">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="8739595775-43">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="8739595775-43">)</span><span·class="w">223 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="0504072462-43">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="0504072462-43">)</span><span·class="w">
224 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">224 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
225 »       </span><span·class="p"·data-group-id="8739595775-44">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="8739595775-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">225 »       </span><span·class="p"·data-group-id="0504072462-44">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="0504072462-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
226 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="8739595775-45">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="8739595775-45">)</span><span·class="w">226 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="0504072462-45">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="0504072462-45">)</span><span·class="w">
227 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">227 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
228 </span><span·class="nf">encode</span><span·class="p"·data-group-id="8739595775-46">(</span><span·class="p"·data-group-id="8739595775-47">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="8739595775-47">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·6c854f8b4d61ee6866e182d3def0dc396ee71357016895ffff75bc58f506c640·...·]-48">]</span><span·class="p">;</span><span·class="w">228 </span><span·class="nf">encode</span><span·class="p"·data-group-id="0504072462-46">(</span><span·class="p"·data-group-id="0504072462-47">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="0504072462-47">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·b4be7282f422014f3965e382b71c5a108b8ff537bc927006ccc83cdea39c50d2·...·]-48">]</span><span·class="p">;</span><span·class="w">
229 </span><span·class="nf">encode</span><span·class="p"·data-group-id="8739595775-49">(</span><span·class="p"·data-group-id="8739595775-50">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8739595775-50">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·cc7c1682fda1d4843d973f22e18b42ecef028ae1ba2cf63f1f50ba76afcd2e83·...·]-51">]</span><span·class="p">.</span><span·class="w">229 </span><span·class="nf">encode</span><span·class="p"·data-group-id="0504072462-49">(</span><span·class="p"·data-group-id="0504072462-50">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="0504072462-50">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·0bd60daa1a2f7873314db4dc1776c7642c6b86398da2a769a6779cf415b2478e·...·]-51">]</span><span·class="p">.</span><span·class="w">
  
230 </span><span·class="nf">decode</span><span·class="p"·data-group-id="8739595775-52">(</span><span·class="p"·data-group-id="8739595775-53">[</span><span·class="n">Int</span><span·class="p"·data-group-id="8739595775-53">]</span><span·class="p"·data-group-id="8739595775-52">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><h2·id="c-program"·class="section-heading">230 </span><span·class="nf">decode</span><span·class="p"·data-group-id="0504072462-52">(</span><span·class="p"·data-group-id="0504072462-53">[</span><span·class="n">Int</span><span·class="p"·data-group-id="0504072462-53">]</span><span·class="p"·data-group-id="0504072462-52">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><h2·id="c-program"·class="section-heading">
231 ··<a·href="#c-program"·class="hover-link">231 ··<a·href="#c-program"·class="hover-link">
232 ····<i·class="ri-link-m"·aria-hidden="true"></i>232 ····<i·class="ri-link-m"·aria-hidden="true"></i>
233 ··</a>233 ··</a>
234 ··<span·class="text">C·Program</span>234 ··<span·class="text">C·Program</span>
235 </h2>235 </h2>
236 <p>On·the·C·side,·it·is·necessary·to·write·functions·for·receiving·and·sending·data236 <p>On·the·C·side,·it·is·necessary·to·write·functions·for·receiving·and·sending·data
237 with·2·byte·length·indicators·from/to·Erlang.·By·default,·the·C·program·is·to237 with·2·byte·length·indicators·from/to·Erlang.·By·default,·the·C·program·is·to
Offset 333, 25 lines modifiedOffset 333, 25 lines modified
333 and·terminates.</p><h2·id="running-the-example"·class="section-heading">333 and·terminates.</p><h2·id="running-the-example"·class="section-heading">
334 ··<a·href="#running-the-example"·class="hover-link">334 ··<a·href="#running-the-example"·class="hover-link">
335 ····<i·class="ri-link-m"·aria-hidden="true"></i>335 ····<i·class="ri-link-m"·aria-hidden="true"></i>
336 ··</a>336 ··</a>
337 ··<span·class="text">Running·the·Example</span>337 ··<span·class="text">Running·the·Example</span>
338 </h2>338 </h2>
339 <p><em>Step·1.</em>·Compile·the·C·code:</p><pre><code·class="text">$·gcc·-o·extprg·complex.c·erl_comm.c·port.c</code></pre><p><em>Step·2.</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">339 <p><em>Step·1.</em>·Compile·the·C·code:</p><pre><code·class="text">$·gcc·-o·extprg·complex.c·erl_comm.c·port.c</code></pre><p><em>Step·2.</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">
340 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="p"·data-group-id="6783747198-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">14.2</span><span·class="p"·data-group-id="6783747198-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="6783747198-2">[</span><span·class="ss">source<[·...·truncated·by·diffoscope;·len:·1283,·SHA:·b38908f6feae751e1137fde83dd4e8282141e11bc04553608446dd4154e65306·...·]-7">]</span><span·class="w">340 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="p"·data-group-id="3157284080-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">14.2</span><span·class="p"·data-group-id="3157284080-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="3157284080-2">[</span><span·class="ss">source<[·...·truncated·by·diffoscope;·len:·1283,·SHA:·07dd1673801a9c771d6144abbca2dea814576951520616c167d8deedc3edb944·...·]-7">]</span><span·class="w">
  
341 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V14</span><span·class="p">.</span><span·class="mi">2</span><span·class="w">·</span><span·class="p"·data-group-id="6783747198-8">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·aa29986cc3109d8836a837ad6650021e60b2f45ae1b252265fcd41dc2ec2cc78·...·]-8">)</span><span·class="gp·unselectable">341 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V14</span><span·class="p">.</span><span·class="mi">2</span><span·class="w">·</span><span·class="p"·data-group-id="3157284080-8">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·826a09143a27382b80c5f7a2d688102976e727a19036fea4852de9b56e3e5b6f·...·]-8">)</span><span·class="gp·unselectable">
342 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="6783747198-10">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="6783747198-10">)</span><span·class="p">.</span><span·class="w">342 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="3157284080-10">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="3157284080-10">)</span><span·class="p">.</span><span·class="w">
343 </span><span·class="p"·data-group-id="6783747198-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">complex1</span><span·class="p"·data-group-id="6783747198-11">}</span></code></pre><p><em>Step·3.</em>·Run·the·example:</p><pre><code·class="makeup·erlang"·translate="[·...·truncated·by·diffoscope;·len:·268,·SHA:·7f70e697ddf3a8102bd21c37765c628f89319510be6ff1d6c787628b0f640109·...·]5-1">)</span><span·class="p">.</span><span·class="w">343 </span><span·class="p"·data-group-id="3157284080-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">complex1</span><span·class="p"·data-group-id="3157284080-11">}</span></code></pre><p><em>Step·3.</em>·Run·the·example:</p><pre><code·class="makeup·erlang"·translate="[·...·truncated·by·diffoscope;·len:·268,·SHA:·c49c090b22bc34b4f00dda8a6085092baac50f2df1e384ae474726f92eea4f4f·...·]5-1">)</span><span·class="p">.</span><span·class="w">
344 </span><span·class="o">&lt;</span><span·class="mf">0.34</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">344 </span><span·class="o">&lt;</span><span·class="mf">0.34</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
345 3&gt;·</span><span·class="nc">complex1</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="0272033245-2">(</span><span·class="mi">3</span><span·class="p"·data-group-id="0272033245-2">)</span><span·class="p">.</span><span·class="w">345 3&gt;·</span><span·class="nc">complex1</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="7613246505-2">(</span><span·class="mi">3</span><span·class="p"·data-group-id="7613246505-2">)</span><span·class="p">.</span><span·class="w">
346 </span><span·class="mi">4</span><span·class="gp·unselectable">346 </span><span·class="mi">4</span><span·class="gp·unselectable">
347 4&gt;·</span><span·class="nc">complex1</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="0272033245-3">(</span><span·class="mi">5</span><span·class="p"·data-group-id="0272033245-3">)</span><span·class="p">.</span><span·class="w">347 4&gt;·</span><span·class="nc">complex1</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="7613246505-3">(</span><span·class="mi">5</span><span·class="p"·data-group-id="7613246505-3">)</span><span·class="p">.</span><span·class="w">
348 </span><span·class="mi">10</span><span·class="gp·unselectable">348 </span><span·class="mi">10</span><span·class="gp·unselectable">
349 5&gt;·</span><span·class="nc">complex1</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0272033245-4">(</span><span·class="p"·data-group-id="0272033245-4">)</span><span·class="p">.</span><span·class="w">349 5&gt;·</span><span·class="nc">complex1</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="7613246505-4">(</span><span·class="p"·data-group-id="7613246505-4">)</span><span·class="p">.</span><span·class="w">
350 </span><span·class="ss">stop</span></code></pre>350 </span><span·class="ss">stop</span></code></pre>
351 </div>351 </div>
  
352 <div·class="bottom-actions"·id="bottom-actions">352 <div·class="bottom-actions"·id="bottom-actions">
353 ··<div·class="bottom-actions-item">353 ··<div·class="bottom-actions-item">
  
354 ······<a·href="example.html"·class="bottom-actions-button"·rel="prev">354 ······<a·href="example.html"·class="bottom-actions-button"·rel="prev">
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151 <p>Like·a·port·program,·the·port·communicates·with·an·Erlang·process.·All151 <p>Like·a·port·program,·the·port·communicates·with·an·Erlang·process.·All
152 communication·goes·through·one·Erlang·process·that·is·the·<em>connected·process</em>·of152 communication·goes·through·one·Erlang·process·that·is·the·<em>connected·process</em>·of
153 the·port·driver.·Terminating·this·process·closes·the·port·driver.</p><p>Before·the·port·is·created,·the·driver·must·be·loaded.·This·is·done·with·the153 the·port·driver.·Terminating·this·process·closes·the·port·driver.</p><p>Before·the·port·is·created,·the·driver·must·be·loaded.·This·is·done·with·the
154 function·<a·href="../../lib/kernel-10.2.6/doc/html/erl_ddll.html#load_driver/2"><code·class="inline">erl_ddll:load_driver/2</code></a>,·with·the·name·of·the·shared·library·as154 function·<a·href="../../lib/kernel-10.2.6/doc/html/erl_ddll.html#load_driver/2"><code·class="inline">erl_ddll:load_driver/2</code></a>,·with·the·name·of·the·shared·library·as
155 argument.</p><p>The·port·is·then·created·using·the·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>,·with·the155 argument.</p><p>The·port·is·then·created·using·the·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>,·with·the
156 tuple·<code·class="inline">{spawn,·DriverName}</code>·as·the·first·argument.·The·string·<code·class="inline">SharedLib</code>·is·the156 tuple·<code·class="inline">{spawn,·DriverName}</code>·as·the·first·argument.·The·string·<code·class="inline">SharedLib</code>·is·the
157 name·of·the·port·driver.·The·second·argument·is·a·list·of·options,·none·in·this157 name·of·the·port·driver.·The·second·argument·is·a·list·of·options,·none·in·this
158 case:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7188767426-1">(</span><span·class="ss">complex5</span><span·class="p"·data-group-id="7188767426-1">)</span><span·class="p">.</span><span·class="w">158 case:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2957627503-1">(</span><span·class="ss">complex5</span><span·class="p"·data-group-id="2957627503-1">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7188767426-2">(</span><span·class="p"·data-group-id="7188767426-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·52a704fcea4e3d50d054099215503ad2babdcbbeb65b9dc2d6dfae2ddda9d5e6·...·]-2">)</span><span·class="p">.</span><span·class="w">159 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2957627503-2">(</span><span·class="p"·data-group-id="2957627503-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·69bccd50e51691267e1b0b74dfbacfc0c73aa0ff098a9e5b6dd9ec6c4c55f55d·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
160 </span><span·class="nf">start</span><span·class="p"·data-group-id="7188767426-4">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="7188767426-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">160 </span><span·class="nf">start</span><span·class="p"·data-group-id="2957627503-4">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2957627503-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
161 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="7188767426-5">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="7188767426-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">161 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="2957627503-5">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2957627503-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
162 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">162 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
163 ········</span><span·class="p"·data-group-id="7188767426-6">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="7188767426-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">163 ········</span><span·class="p"·data-group-id="2957627503-6">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="2957627503-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
164 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="7188767426-7">(</span><span·class="p"·data-group-id="7188767426-8">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">could_not_load_driver</span><span·class="p"·data-group-id="7188767426-8">}</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·8bc261ab6eaca9cfa8a4359c236373e71bde922c623c022fd9c04670e18beff6·...·]-7">)</span><span·class="w">164 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="2957627503-7">(</span><span·class="p"·data-group-id="2957627503-8">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">could_not_load_driver</span><span·class="p"·data-group-id="2957627503-8">}</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·f6b267f130ea7387050d052f7036591d5005185f72458aaac6f21af22384a64e·...·]-7">)</span><span·class="w">
165 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">165 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
166 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7188767426-9">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7188767426-10">[</span><sp[·...·truncated·by·diffoscope;·len:·124,·SHA:·434814d7904673771b218552a2c7975a78e984efb22cdfd2748e3f7f882712ba·...·]-9">)</span><span·class="p">.</span><span·class="w">166 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2957627503-9">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2957627503-10">[</span><sp[·...·truncated·by·diffoscope;·len:·124,·SHA:·d317c32bc392a1053e5834429cf31d40e5880faea59a755ad13a6cc6f2cc797c·...·]-9">)</span><span·class="p">.</span><span·class="w">
  
167 </span><span·class="nf">init</span><span·class="p"·data-group-id="7188767426-11">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="7188767426-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 </span><span·class="nf">init</span><span·class="p"·data-group-id="2957627503-11">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2957627503-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 ··</span><span·class="nf">register</span><span·class="p"·data-group-id="7188767426-12">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="7188767426-13">(</span><span·class="p"·data-group-id="7188767426-13">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·bffa4ac4b295778f752a53472c08e0adb02f9bd049bf54e63e4a1b50310dcea5·...·]-12">)</span><span·class="p">,</span><span·class="w">168 ··</span><span·class="nf">register</span><span·class="p"·data-group-id="2957627503-12">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="2957627503-13">(</span><span·class="p"·data-group-id="2957627503-13">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·f519e72e6e74acc2d283bd3a26f938ed56841e15e567ac977ab59db45c2d8350·...·]-12">)</span><span·class="p">,</span><span·class="w">
169 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="7188767426-14">(</span><span·class="p"·data-group-id="7188767426-15">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="7188767426-15">}</span><span·class="p">[·...·truncated·by·diffoscope;·len:·181,·SHA:·ffd3a7fed6379f15dea2728f9a4970a82ea3115fc367b9eb5bd130198e5dcebc·...·]-14">)</span><span·class="p">,</span><span·class="w">169 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="2957627503-14">(</span><span·class="p"·data-group-id="2957627503-15">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2957627503-15">}</span><span·class="p">[·...·truncated·by·diffoscope;·len:·181,·SHA:·bf00b2ee081ec3e43b97c3b649a36aa164fccfb1455a289e4858dadb053ac358·...·]-14">)</span><span·class="p">,</span><span·class="w">
170 ··</span><span·class="nf">loop</span><span·class="p"·data-group-id="7188767426-17">(</span><span·class="n">Port</span><span·class="p"·data-group-id="7188767426-17">)</span><span·class="p">.</span></code></pre><p>Now·<code·class="inline">complex5:foo/1</code>·and·<code·class="inline">complex5:bar/1</code>·can·be·implemented.·Both·send·a170 ··</span><span·class="nf">loop</span><span·class="p"·data-group-id="2957627503-17">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2957627503-17">)</span><span·class="p">.</span></code></pre><p>Now·<code·class="inline">complex5:foo/1</code>·and·<code·class="inline">complex5:bar/1</code>·can·be·implemented.·Both·send·a
171 message·to·the·<code·class="inline">complex</code>·process·and·receive·the·following·reply:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="3500272313-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="3500272313-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 message·to·the·<code·class="inline">complex</code>·process·and·receive·the·following·reply:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="8111705833-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="8111705833-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="3500272313-2">(</span><span·class="p"·data-group-id="3500272313-3">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="3500272313-3">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·11,·SHA:·020ff2c020c178ed85fd796819c3b0d6c6dfc08e3bde358d8774a7a229ed5fe5·...·]3-2">)</span><span·class="p">.</span><span·class="w">172 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="8111705833-2">(</span><span·class="p"·data-group-id="8111705833-3">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="8111705833-3">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·11,·SHA:·2ef6a904d9852c13bfce819b8ccd2da99239210ff5ca0364323d39b2dca05dda·...·]3-2">)</span><span·class="p">.</span><span·class="w">
173 </span><span·class="nf">bar</span><span·class="p"·data-group-id="3500272313-4">(</span><span·class="n">Y</span><span·class="p"·data-group-id="3500272313-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="nf">bar</span><span·class="p"·data-group-id="8111705833-4">(</span><span·class="n">Y</span><span·class="p"·data-group-id="8111705833-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="3500272313-5">(</span><span·class="p"·data-group-id="3500272313-6">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="3500272313-6">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·11,·SHA:·020ff2c020c178ed85fd796819c3b0d6c6dfc08e3bde358d8774a7a229ed5fe5·...·]3-5">)</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="8111705833-5">(</span><span·class="p"·data-group-id="8111705833-6">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8111705833-6">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·11,·SHA:·2ef6a904d9852c13bfce819b8ccd2da99239210ff5ca0364323d39b2dca05dda·...·]3-5">)</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="3500272313-7">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="3500272313-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="8111705833-7">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="8111705833-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3500272313-8">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="3500272313-9">(</span><span·class="p"·data-group-id="3500272313-9">)</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·90,·SHA:·955b80681b632f1ca0c9f50ca1843a684b7a35655e0138ff01c05aece611a8e2·...·]3-8">}</span><span·class="p">,</span><span·class="w">176 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8111705833-8">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8111705833-9">(</span><span·class="p"·data-group-id="8111705833-9">)</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·90,·SHA:·da2c96b6d7828ed70e991f9aac0056512fc21f0023bf9870dcb63f5589fe9e05·...·]3-8">}</span><span·class="p">,</span><span·class="w">
177 ····</span><span·class="k">receive</span><span·class="w">177 ····</span><span·class="k">receive</span><span·class="w">
178 ········</span><span·class="p"·data-group-id="3500272313-10">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="3500272313-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 ········</span><span·class="p"·data-group-id="8111705833-10">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="8111705833-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ············</span><span·class="n">Result</span><span·class="w">179 ············</span><span·class="n">Result</span><span·class="w">
180 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">complex</code>·process·performs·the·following:</p><ul><li>Encodes·the·message·into·a·sequence·of·bytes.</li><li>Sends·it·to·the·port.</li><li>Waits·for·a·reply.</li><li>Decodes·the·reply.</li><li>Sends·it·back·to·the·caller:</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="2273720811-1">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2273720811-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">complex</code>·process·performs·the·following:</p><ul><li>Encodes·the·message·into·a·sequence·of·bytes.</li><li>Sends·it·to·the·port.</li><li>Waits·for·a·reply.</li><li>Decodes·the·reply.</li><li>Sends·it·back·to·the·caller:</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="2907169485-1">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2907169485-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ····</span><span·class="k">receive</span><span·class="w">181 ····</span><span·class="k">receive</span><span·class="w">
182 ········</span><span·class="p"·data-group-id="2273720811-2">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="2273720811-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 ········</span><span·class="p"·data-group-id="2907169485-2">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="2907169485-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ············</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2273720811-3">{</span><span·class="nf">self</span><span·class="p"·data-group-id="2273720811-4">(</span><span·class="p"·data-group-id="2273720811-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2273720811-5">{</span>[·...·truncated·by·diffoscope;·len:·335,·SHA:·de15996e2077021731d306c329cc690980a0fdebc249192b6f74900c238f2799·...·]-3">}</span><span·class="p">,</span><span·class="w">183 ············</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2907169485-3">{</span><span·class="nf">self</span><span·class="p"·data-group-id="2907169485-4">(</span><span·class="p"·data-group-id="2907169485-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2907169485-5">{</span>[·...·truncated·by·diffoscope;·len:·335,·SHA:·ad44889f5d938e55d8d7205d77c00fd67eab735e2e5a8a45c271403f6222ad04·...·]-3">}</span><span·class="p">,</span><span·class="w">
184 ············</span><span·class="k">receive</span><span·class="w">184 ············</span><span·class="k">receive</span><span·class="w">
185 ················</span><span·class="p"·data-group-id="2273720811-7">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2273720811-8">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·bdc42d7422bb8eab5e9bbe057da901a1560565e2584a5bc1cf14c177e800ca8f·...·]-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">185 ················</span><span·class="p"·data-group-id="2907169485-7">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2907169485-8">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·6f1f7dbc275efa30643e413fcf390abff417f72c3beef6690a8456dc3745d8ca·...·]-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
186 ····················</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2273720811-9">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="2273720811-10">(</span><span·class="n">Data</span><span·class="p"·data-group-id="2273720811-10"[·...·truncated·by·diffoscope;·len:·50,·SHA:·fde8b7c2ef707dea5bf0c5f2f963829da34fdfdcf6cc0515b65f202a3cf86bbc·...·]-9">}</span><span·class="w">186 ····················</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2907169485-9">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="2907169485-10">(</span><span·class="n">Data</span><span·class="p"·data-group-id="2907169485-10"[·...·truncated·by·diffoscope;·len:·50,·SHA:·39fd042edad8f23b0a67c8ca681d2bff2a57c164a27f7aed3a35c03475c3e897·...·]-9">}</span><span·class="w">
187 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">187 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
188 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="2273720811-11">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2273720811-11">)</span><span·class="w">188 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="2907169485-11">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2907169485-11">)</span><span·class="w">
189 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Assuming·that·both·the·arguments·and·the·results·from·the·C·functions·are·less189 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Assuming·that·both·the·arguments·and·the·results·from·the·C·functions·are·less
190 than·256,·a·simple·encoding/decoding·scheme·is·employed.·In·this·scheme,·<code·class="inline">foo</code>190 than·256,·a·simple·encoding/decoding·scheme·is·employed.·In·this·scheme,·<code·class="inline">foo</code>
191 is·represented·by·byte·1,·<code·class="inline">bar</code>·is·represented·by·2,·and·the·argument/result·is191 is·represented·by·byte·1,·<code·class="inline">bar</code>·is·represented·by·2,·and·the·argument/result·is
192 represented·by·a·single·byte·as·well:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">encode</span><span·class="p"·data-group-id="6763737873-1">(</span><span·class="p"·data-group-id="6763737873-2">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="6763737873-2">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·a7313d2490d175283789de79682745a9ba0a2a6e0b70fd96fdb94c1f50e4fba0·...·]-3">]</span><span·class="p">;</span><span·class="w">192 represented·by·a·single·byte·as·well:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">encode</span><span·class="p"·data-group-id="8827134349-1">(</span><span·class="p"·data-group-id="8827134349-2">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="8827134349-2">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·8e7f3becafe331249491ef5a62ee9b0529d898c807fa046e8cc032a541ad35c4·...·]-3">]</span><span·class="p">;</span><span·class="w">
193 </span><span·class="nf">encode</span><span·class="p"·data-group-id="6763737873-4">(</span><span·class="p"·data-group-id="6763737873-5">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6763737873-5">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·95c3873a0aded3f893cd9dccaffc34fcbefca457621613150366d59855d4551d·...·]-6">]</span><span·class="p">.</span><span·class="w">193 </span><span·class="nf">encode</span><span·class="p"·data-group-id="8827134349-4">(</span><span·class="p"·data-group-id="8827134349-5">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8827134349-5">}</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·291,·SHA:·cb7fd6f680bb8816a3944e1c42e6057f8e3534ff49ba7dd1dc73fd49adec2754·...·]-6">]</span><span·class="p">.</span><span·class="w">
  
194 </span><span·class="nf">decode</span><span·class="p"·data-group-id="6763737873-7">(</span><span·class="p"·data-group-id="6763737873-8">[</span><span·class="n">Int</span><span·class="p"·data-group-id="6763737873-8">]</span><span·class="p"·data-group-id="6763737873-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><p>The·resulting·Erlang·program,·including·functions·for·stopping·the·port·and194 </span><span·class="nf">decode</span><span·class="p"·data-group-id="8827134349-7">(</span><span·class="p"·data-group-id="8827134349-8">[</span><span·class="n">Int</span><span·class="p"·data-group-id="8827134349-8">]</span><span·class="p"·data-group-id="8827134349-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><p>The·resulting·Erlang·program,·including·functions·for·stopping·the·port·and
195 detecting·port·failures,·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">195 detecting·port·failures,·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
196 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2941200379-1">(</span><span·class="ss">complex5</span><span·class="p"·data-group-id="2941200379-1">)</span><span·class="p">.</span><span·class="w">196 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8501175435-1">(</span><span·class="ss">complex5</span><span·class="p"·data-group-id="8501175435-1">)</span><span·class="p">.</span><span·class="w">
197 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2941200379-2">(</span><span·class="p"·data-group-id="2941200379-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·b9b8005b44610f5d21383951c95aad1b6495b834b96b78ccd9181d61ce99d435·...·]-2">)</span><span·class="p">.</span><span·class="w">197 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8501175435-2">(</span><span·class="p"·data-group-id="8501175435-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·046572a6c3a98085dcd7bbba6237fd0448d73d5570c23e5c149e1c0293c5053a·...·]-2">)</span><span·class="p">.</span><span·class="w">
198 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2941200379-4">(</span><span·class="p"·data-group-id="2941200379-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·6784aaf83bd21e4663d9e13645f0409a5699fed2f6dede35bb04bafbca6c7d1d·...·]-4">)</span><span·class="p">.</span><span·class="w">198 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8501175435-4">(</span><span·class="p"·data-group-id="8501175435-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·073ff76a07e6fd2c97402388b8a6a3684e6d1ef0ded0f4bc3b1a2ffd33140cd1·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
199 </span><span·class="nf">start</span><span·class="p"·data-group-id="2941200379-6">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2941200379-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">199 </span><span·class="nf">start</span><span·class="p"·data-group-id="8501175435-6">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="8501175435-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
200 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="2941200379-7">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2941200379-7">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">200 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="8501175435-7">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="8501175435-7">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
201 »       </span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">201 »       </span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
202 »       </span><span·class="p"·data-group-id="2941200379-8">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="2941200379-8">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">202 »       </span><span·class="p"·data-group-id="8501175435-8">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="8501175435-8">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
203 »       </span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="2941200379-9">(</span><span·class="p"·data-group-id="2941200379-10">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">could_not_load_driver</span><span·class="p"·data-group-id="2941200379-10">}</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·12b43194668ace3288c639305434fa0e0e80543a35708c773510d3decffe82df·...·]-9">)</span><span·class="w">203 »       </span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="8501175435-9">(</span><span·class="p"·data-group-id="8501175435-10">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">could_not_load_driver</span><span·class="p"·data-group-id="8501175435-10">}</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·508e0923f24501c6509f2d635f247d470d564c4f0e2d5f00c1ae8a4119739274·...·]-9">)</span><span·class="w">
204 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2941200379-11">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-12">[</span><s[·...·truncated·by·diffoscope;·len:·125,·SHA:·439a2e3aeb0f16c4e62264a3fc4f6ea4f0127adb5d1846e5df122fc083bc9e04·...·]-11">)</span><span·class="p">.</span><span·class="w">205 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="8501175435-11">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-12">[</span><s[·...·truncated·by·diffoscope;·len:·125,·SHA:·efba881110a58974eb2475e5e04b5997951d5c3f985851a226cc31864531bc76·...·]-11">)</span><span·class="p">.</span><span·class="w">
  
206 </span><span·class="nf">init</span><span·class="p"·data-group-id="2941200379-13">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2941200379-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 </span><span·class="nf">init</span><span·class="p"·data-group-id="8501175435-13">(</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="8501175435-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="2941200379-14">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="2941200379-15">(</span><span·class="p"·data-group-id="2941200379-15">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·52bea6293b6a65a5d4b1e4a096264c54e29acf8c6454a03f6541664590b94acf·...·]-14">)</span><span·class="p">,</span><span·class="w">207 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="8501175435-14">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8501175435-15">(</span><span·class="p"·data-group-id="8501175435-15">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·b8aa238dcfb7bbfe16e66620c46c2d6b70240e3e5e115389ebac0308bb18fd3b·...·]-14">)</span><span·class="p">,</span><span·class="w">
208 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="2941200379-16">(</span><span·class="p"·data-group-id="2941200379-17">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="2941200379-17">}</span><span·class="p">[·...·truncated·by·diffoscope;·len:·181,·SHA:·2e1a6ad1b8e4ac000b77bd1be4524bbf54e3823f8d8a68d066b58f7195e97199·...·]-16">)</span><span·class="p">,</span><span·class="w">208 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="8501175435-16">(</span><span·class="p"·data-group-id="8501175435-17">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SharedLib</span><span·class="p"·data-group-id="8501175435-17">}</span><span·class="p">[·...·truncated·by·diffoscope;·len:·181,·SHA:·99c03d33ee6493dd2ec8ef3f5aa9a053b0e52c13f9d4c2f38789df6e00a4c5ab·...·]-16">)</span><span·class="p">,</span><span·class="w">
209 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="2941200379-19">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2941200379-19">)</span><span·class="p">.</span><span·class="w">209 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8501175435-19">(</span><span·class="n">Port</span><span·class="p"·data-group-id="8501175435-19">)</span><span·class="p">.</span><span·class="w">
  
210 </span><span·class="nf">stop</span><span·class="p"·data-group-id="2941200379-20">(</span><span·class="p"·data-group-id="2941200379-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 </span><span·class="nf">stop</span><span·class="p"·data-group-id="8501175435-20">(</span><span·class="p"·data-group-id="8501175435-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">211 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">
  
212 </span><span·class="nf">foo</span><span·class="p"·data-group-id="2941200379-21">(</span><span·class="n">X</span><span·class="p"·data-group-id="2941200379-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">212 </span><span·class="nf">foo</span><span·class="p"·data-group-id="8501175435-21">(</span><span·class="n">X</span><span·class="p"·data-group-id="8501175435-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
213 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="2941200379-22">(</span><span·class="p"·data-group-id="2941200379-23">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="2941200379-23">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·536479d31f667a5afaba56a193f947343e764aef29a004fb9afbe1f1bc4a476d·...·]-22">)</span><span·class="p">.</span><span·class="w">213 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="8501175435-22">(</span><span·class="p"·data-group-id="8501175435-23">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="8501175435-23">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·ec1ab3460244dde05d4a8056900162f160a0fab37a30a9971592ed41cd23dbfd·...·]-22">)</span><span·class="p">.</span><span·class="w">
214 </span><span·class="nf">bar</span><span·class="p"·data-group-id="2941200379-24">(</span><span·class="n">Y</span><span·class="p"·data-group-id="2941200379-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 </span><span·class="nf">bar</span><span·class="p"·data-group-id="8501175435-24">(</span><span·class="n">Y</span><span·class="p"·data-group-id="8501175435-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="2941200379-25">(</span><span·class="p"·data-group-id="2941200379-26">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="2941200379-26">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·536479d31f667a5afaba56a193f947343e764aef29a004fb9afbe1f1bc4a476d·...·]-25">)</span><span·class="p">.</span><span·class="w">215 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="8501175435-25">(</span><span·class="p"·data-group-id="8501175435-26">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8501175435-26">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·ec1ab3460244dde05d4a8056900162f160a0fab37a30a9971592ed41cd23dbfd·...·]-25">)</span><span·class="p">.</span><span·class="w">
  
216 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="2941200379-27">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="2941200379-27">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">216 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="8501175435-27">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="8501175435-27">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
217 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-28">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="2941200379-29">(</span><span·class="p"·data-group-id="2941200379-29">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·30635268c6fcc9ec5bd6b74eedad12818adc689ae4d46c776bcf79353052c39c·...·]-28">}</span><span·class="p">,</span><span·class="w">217 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-28">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8501175435-29">(</span><span·class="p"·data-group-id="8501175435-29">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·def195e8220d7f8cd427fc8371ca51e22f346f55e99250dfd3a93a3c3e5802e4·...·]-28">}</span><span·class="p">,</span><span·class="w">
218 ····</span><span·class="k">receive</span><span·class="w">218 ····</span><span·class="k">receive</span><span·class="w">
219 »       </span><span·class="p"·data-group-id="2941200379-30">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="2941200379-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 »       </span><span·class="p"·data-group-id="8501175435-30">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="8501175435-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 »       ····</span><span·class="n">Result</span><span·class="w">220 »       ····</span><span·class="n">Result</span><span·class="w">
221 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">221 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
222 </span><span·class="nf">loop</span><span·class="p"·data-group-id="2941200379-31">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2941200379-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 </span><span·class="nf">loop</span><span·class="p"·data-group-id="8501175435-31">(</span><span·class="n">Port</span><span·class="p"·data-group-id="8501175435-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 ····</span><span·class="k">receive</span><span·class="w">223 ····</span><span·class="k">receive</span><span·class="w">
224 »       </span><span·class="p"·data-group-id="2941200379-32">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="2941200379-32">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 »       </span><span·class="p"·data-group-id="8501175435-32">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="8501175435-32">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-33">{</span><span·class="nf">self</span><span·class="p"·data-group-id="2941200379-34">(</span><span·class="p"·data-group-id="2941200379-34">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-35">{</[·...·truncated·by·diffoscope;·len:·343,·SHA:·ea433dc66ed1d72c16e6cb9bc865df87cfa6831c860852877ef95da3db98a413·...·]-33">}</span><span·class="p">,</span><span·class="w">225 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-33">{</span><span·class="nf">self</span><span·class="p"·data-group-id="8501175435-34">(</span><span·class="p"·data-group-id="8501175435-34">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-35">{</[·...·truncated·by·diffoscope;·len:·343,·SHA:·2a827566b0f0402146100ebf1742ed0dc32eeca4b66d1a2c829b4a2101e3b94e·...·]-33">}</span><span·class="p">,</span><span·class="w">
226 »       ····</span><span·class="k">receive</span><span·class="w">226 »       ····</span><span·class="k">receive</span><span·class="w">
227 »       »       </span><span·class="p"·data-group-id="2941200379-37">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-38">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·db56d84fa12da366dd6e61b1e3a0f402322d0ba99f42f60cafd382f5cf2694a9·...·]-37">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 »       »       </span><span·class="p"·data-group-id="8501175435-37">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-38">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·7abde85ed03df945390c6ce87434ed2b89d600386d7e7d1a825e4226974f3a47·...·]-37">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-39">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="2941200379-40">(</span><span·class="n">Data</span><span·class="p"·data-group-id="2941200379-4[·...·truncated·by·diffoscope;·len:·52,·SHA:·4541144fa5bcfde80f5ede331e7715ce2c0e18f96eab3ecfe2bb2e7e6535b5e5·...·]-39">}</span><span·class="w">228 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-39">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="8501175435-40">(</span><span·class="n">Data</span><span·class="p"·data-group-id="8501175435-4[·...·truncated·by·diffoscope;·len:·52,·SHA:·907b9f3059526d5ce8866c2bc33c3d29b647449f6ecd9a206402475c51528e02·...·]-39">}</span><span·class="w">
229 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">229 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
230 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="2941200379-41">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2941200379-41">)</span><span·class="p">;</span><span·class="w">230 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8501175435-41">(</span><span·class="n">Port</span><span·class="p"·data-group-id="8501175435-41">)</span><span·class="p">;</span><span·class="w">
231 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-42">{</span><span·class="nf">self</span><span·class="p"·data-group-id="2941200379-43">(</span><span·class="p"·data-group-id="2941200379-43">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·3fa355957235d22c57581175948cfe67ae6df0356b70ea692f5146ad7b9f852a·...·]-42">}</span><span·class="p">,</span><span·class="w">232 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-42">{</span><span·class="nf">self</span><span·class="p"·data-group-id="8501175435-43">(</span><span·class="p"·data-group-id="8501175435-43">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·bd6e13c70a69d93546cfecd64722ae830bf1f7aded0f79c509066d50a3362a3a·...·]-42">}</span><span·class="p">,</span><span·class="w">
233 »       ····</span><span·class="k">receive</span><span·class="w">233 »       ····</span><span·class="k">receive</span><span·class="w">
234 »       »       </span><span·class="p"·data-group-id="2941200379-44">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="2941200379-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">234 »       »       </span><span·class="p"·data-group-id="8501175435-44">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="8501175435-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
235 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="2941200379-45">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="2941200379-45">)</span><span·class="w">235 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="8501175435-45">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="8501175435-45">)</span><span·class="w">
236 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">236 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
237 »       </span><span·class="p"·data-group-id="2941200379-46">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="2941200379-46">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">237 »       </span><span·class="p"·data-group-id="8501175435-46">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="8501175435-46">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
238 »       ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2941200379-47">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2941200379-48">[</sp[·...·truncated·by·diffoscope;·len:·127,·SHA:·6a18f5d7f64d32a61f8438f1431bce25ecab55399772c3f99d576374ae94ba82·...·]-47">)</span><span·class="p">,</span><span·class="w">238 »       ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8501175435-47">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8501175435-48">[</sp[·...·truncated·by·diffoscope;·len:·127,·SHA:·28adf634c74cb6dd7ea0f73645164d8730c32f6d4537c3f26cae90d41117a517·...·]-47">)</span><span·class="p">,</span><span·class="w">
239 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="2941200379-49">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="2941200379-49">)</span><span·class="w">239 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="8501175435-49">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="8501175435-49">)</span><span·class="w">
240 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">240 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
241 </span><span·class="nf">encode</span><span·class="p"·data-group-id="2941200379-50">(</span><span·class="p"·data-group-id="2941200379-51">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="2941200379-51">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·b241941c0ea6818ac34a62dacbdcd22ec708a7b22734c791f5fbb59d1875f39e·...·]-52">]</span><span·class="p">;</span><span·class="w">241 </span><span·class="nf">encode</span><span·class="p"·data-group-id="8501175435-50">(</span><span·class="p"·data-group-id="8501175435-51">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="8501175435-51">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·8a7ab444f175eb2e76bedcc1957abb384d703493686f73f96c20d992ce9ce37f·...·]-52">]</span><span·class="p">;</span><span·class="w">
242 </span><span·class="nf">encode</span><span·class="p"·data-group-id="2941200379-53">(</span><span·class="p"·data-group-id="2941200379-54">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="2941200379-54">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·7a87707b77bc9385ccdf6c7f9351d0f4b70ecd545aaf3764eb7f4879f5a598a9·...·]-55">]</span><span·class="p">.</span><span·class="w">242 </span><span·class="nf">encode</span><span·class="p"·data-group-id="8501175435-53">(</span><span·class="p"·data-group-id="8501175435-54">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8501175435-54">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·583c09477dc2b6887ac31f3acec3a8a9e94c4702d940cc8d5da14613223a770b·...·]-55">]</span><span·class="p">.</span><span·class="w">
  
243 </span><span·class="nf">decode</span><span·class="p"·data-group-id="2941200379-56">(</span><span·class="p"·data-group-id="2941200379-57">[</span><span·class="n">Int</span><span·class="p"·data-group-id="2941200379-57">]</span><span·class="p"·data-group-id="2941200379-56">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><h2·id="c-driver"·class="section-heading">243 </span><span·class="nf">decode</span><span·class="p"·data-group-id="8501175435-56">(</span><span·class="p"·data-group-id="8501175435-57">[</span><span·class="n">Int</span><span·class="p"·data-group-id="8501175435-57">]</span><span·class="p"·data-group-id="8501175435-56">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><h2·id="c-driver"·class="section-heading">
244 ··<a·href="#c-driver"·class="hover-link">244 ··<a·href="#c-driver"·class="hover-link">
245 ····<i·class="ri-link-m"·aria-hidden="true"></i>245 ····<i·class="ri-link-m"·aria-hidden="true"></i>
246 ··</a>246 ··</a>
247 ··<span·class="text">C·Driver</span>247 ··<span·class="text">C·Driver</span>
248 </h2>248 </h2>
249 <p>The·C·driver·is·a·module·that·is·compiled·and·linked·into·a·shared·library.·It249 <p>The·C·driver·is·a·module·that·is·compiled·and·linked·into·a·shared·library.·It
250 uses·a·driver·structure·and·includes·the·header·file·<code·class="inline">erl_driver.h</code>.</p><p>The·driver·structure·is·filled·with·the·driver·name·and·function·pointers.·It·is250 uses·a·driver·structure·and·includes·the·header·file·<code·class="inline">erl_driver.h</code>.</p><p>The·driver·structure·is·filled·with·the·driver·name·and·function·pointers.·It·is
Offset 347, 25 lines modifiedOffset 347, 25 lines modified
347 ··<a·href="#running-the-example"·class="hover-link">347 ··<a·href="#running-the-example"·class="hover-link">
348 ····<i·class="ri-link-m"·aria-hidden="true"></i>348 ····<i·class="ri-link-m"·aria-hidden="true"></i>
349 ··</a>349 ··</a>
350 ··<span·class="text">Running·the·Example</span>350 ··<span·class="text">Running·the·Example</span>
351 </h2>351 </h2>
352 <p><em>Step·1.</em>·Compile·the·C·code:</p><pre><code·class="text">unix&gt;·gcc·-o·example_drv.so·-fpic·-shared·complex.c·port_driver.c352 <p><em>Step·1.</em>·Compile·the·C·code:</p><pre><code·class="text">unix&gt;·gcc·-o·example_drv.so·-fpic·-shared·complex.c·port_driver.c
353 windows&gt;·cl·-LD·-MD·-Fe·example_drv.dll·complex.c·port_driver.c</code></pre><p><em>Step·2.</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="ss">erl</span><span·class="w">353 windows&gt;·cl·-LD·-MD·-Fe·example_drv.dll·complex.c·port_driver.c</code></pre><p><em>Step·2.</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="ss">erl</span><span·class="w">
354 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="p"·data-group-id="7002160515-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">14.2</span><span·class="p"·data-group-id="7002160515-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="7002160515-2">[</span><span·class="ss">source</s[·...·truncated·by·diffoscope;·len:·1281,·SHA:·a6e522011d07cdc11e5ae6ac2003e6b6fd0bbb81ff949548cb4edf08df600cee·...·]-7">]</span><span·class="w">354 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="p"·data-group-id="7090220246-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">14.2</span><span·class="p"·data-group-id="7090220246-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="7090220246-2">[</span><span·class="ss">source</s[·...·truncated·by·diffoscope;·len:·1281,·SHA:·92b3b75a618aa0e31f3a932a0764471621b829f223273209195ecdb0d41c0b76·...·]-7">]</span><span·class="w">
  
355 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V14</span><span·class="p">.</span><span·class="mi">2</span><span·class="w">·</span><span·class="p"·data-group-id="7002160515-8">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><span[·...·truncated·by·diffoscope;·len:·397,·SHA:·6d27fe088e138081c9071ce273ab5654d97851bd77c0f09cf72cafb658bb9ad9·...·]-8">)</span><span·class="gp·unselectable">355 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V14</span><span·class="p">.</span><span·class="mi">2</span><span·class="w">·</span><span·class="p"·data-group-id="7090220246-8">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><span[·...·truncated·by·diffoscope;·len:·397,·SHA:·021766c699b035f1feffa3fce3c6ea119464f14853e7f31199d63d4db100c674·...·]-8">)</span><span·class="gp·unselectable">
356 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="7002160515-10">(</span><span·class="ss">complex5</span><span·class="p"·data-group-id="7002160515-10">)</span><span·class="p">.</span><span·class="w">356 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="7090220246-10">(</span><span·class="ss">complex5</span><span·class="p"·data-group-id="7090220246-10">)</span><span·class="p">.</span><span·class="w">
357 </span><span·class="p"·data-group-id="7002160515-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">complex5</span><span·class="p"·data-group-id="7002160515-11">}</span></code></pre><p><em>Step·3.</em>·Run·the·example:</p><pre><code·class="makeup·erlang"·translate="no[·...·truncated·by·diffoscope;·len:·270,·SHA:·808963d22acf328027635534cc9fc4f199f35b7b6a1ce2c3647cbac947f5e81f·...·]-1">)</span><span·class="p">.</span><span·class="w">357 </span><span·class="p"·data-group-id="7090220246-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">complex5</span><span·class="p"·data-group-id="7090220246-11">}</span></code></pre><p><em>Step·3.</em>·Run·the·example:</p><pre><code·class="makeup·erlang"·translate="no[·...·truncated·by·diffoscope;·len:·270,·SHA:·f127fe938c2b474b26597ef6f1ab7b21ab94a9485e5f0afb439a9c9cc37c8f77·...·]-1">)</span><span·class="p">.</span><span·class="w">
358 </span><span·class="o">&lt;</span><span·class="mf">0.34</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">358 </span><span·class="o">&lt;</span><span·class="mf">0.34</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
359 3&gt;·</span><span·class="nc">complex5</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="1323473847-2">(</span><span·class="mi">3</span><span·class="p"·data-group-id="1323473847-2">)</span><span·class="p">.</span><span·class="w">359 3&gt;·</span><span·class="nc">complex5</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="0069143241-2">(</span><span·class="mi">3</span><span·class="p"·data-group-id="0069143241-2">)</span><span·class="p">.</span><span·class="w">
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186 ······<p·class="built-using">186 ······<p·class="built-using">
187 ········Built·using187 ········Built·using
188 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the188 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
190 ······</p>190 ······</p>
191 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>191 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
192 ····</footer>192 ····</footer>
193 ··</div>193 ··</div>
194 </main>194 </main>
195 </div>195 </div>
196 <script>196 <script>
197 ··function·mermaidLoaded()·{197 ··function·mermaidLoaded()·{
198 ····mermaid.initialize({198 ····mermaid.initialize({
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164 ······<p·class="built-using">164 ······<p·class="built-using">
165 ········Built·using165 ········Built·using
166 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the166 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
167 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>167 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
168 ······</p>168 ······</p>
169 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>169 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
170 ····</footer>170 ····</footer>
171 ··</div>171 ··</div>
172 </main>172 </main>
173 </div>173 </div>
174 <script>174 <script>
175 ··function·mermaidLoaded()·{175 ··function·mermaidLoaded()·{
176 ····mermaid.initialize({176 ····mermaid.initialize({
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122 ····<i·class="ri-link-m"·aria-hidden="true"></i>122 ····<i·class="ri-link-m"·aria-hidden="true"></i>
123 ··</a>123 ··</a>
124 ··<span·class="text">Compilation</span>124 ··<span·class="text">Compilation</span>
125 </h2>125 </h2>
126 <p>Erlang·programs·must·be·<em>compiled</em>·to·object·code.·The·compiler·can·generate·a126 <p>Erlang·programs·must·be·<em>compiled</em>·to·object·code.·The·compiler·can·generate·a
127 new·file·that·contains·the·object·code.·The·current·abstract·machine,·which·runs127 new·file·that·contains·the·object·code.·The·current·abstract·machine,·which·runs
128 the·object·code,·is·called·BEAM,·therefore·the·object·files·get·the·suffix128 the·object·code,·is·called·BEAM,·therefore·the·object·files·get·the·suffix
129 <code·class="inline">.beam</code>.·The·compiler·can·also·generate·a·binary·which·can·be·loaded·directly.</p><p>The·compiler·is·located·in·the·module·<a·href="../../lib/compiler-8.6.1/doc/html/compile.html"><code·class="inline">compile</code></a>·in·Compiler.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="1989250610-1">(</span><span·class="n">Module</span><span·class="p"·data-group-id="1989250610-1">)</span><span·class="w">129 <code·class="inline">.beam</code>.·The·compiler·can·also·generate·a·binary·which·can·be·loaded·directly.</p><p>The·compiler·is·located·in·the·module·<a·href="../../lib/compiler-8.6.1/doc/html/compile.html"><code·class="inline">compile</code></a>·in·Compiler.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="5958753269-1">(</span><span·class="n">Module</span><span·class="p"·data-group-id="5958753269-1">)</span><span·class="w">
130 </span><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="1989250610-2">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Options</span><span·class="p"·data-group-id="1989250610-2">)</span></code></pre><p>The·Erlang·shell·understands·the·command·<code·class="inline">c(Module)</code>,·which·both·compiles·and130 </span><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="5958753269-2">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Options</span><span·class="p"·data-group-id="5958753269-2">)</span></code></pre><p>The·Erlang·shell·understands·the·command·<code·class="inline">c(Module)</code>,·which·both·compiles·and
131 loads·<code·class="inline">Module</code>.</p><p>There·is·also·a·module·<code·class="inline">make</code>,·which·provides·a·set·of·functions·similar·to·the131 loads·<code·class="inline">Module</code>.</p><p>There·is·also·a·module·<code·class="inline">make</code>,·which·provides·a·set·of·functions·similar·to·the
132 UNIX·type·Make·functions,·see·module·<a·href="../../lib/tools-4.1.1/doc/html/make.html"><code·class="inline">make</code></a>·in·Tools.</p><p>The·compiler·can·also·be·accessed·from·the·OS·prompt·using·the132 UNIX·type·Make·functions,·see·module·<a·href="../../lib/tools-4.1.1/doc/html/make.html"><code·class="inline">make</code></a>·in·Tools.</p><p>The·compiler·can·also·be·accessed·from·the·OS·prompt·using·the
133 <a·href="../../erts-15.2.6/doc/html/erl_cmd.html">erl</a>·executable·in·ERTS.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-compile·Module1...ModuleN</span><span·class="w">133 <a·href="../../erts-15.2.6/doc/html/erl_cmd.html">erl</a>·executable·in·ERTS.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-compile·Module1...ModuleN</span><span·class="w">
134 </span><span·class="c1">%·erl·-make</span></code></pre><p>The·<code·class="inline">erlc</code>·program·provides·way·to·compile·modules·from·the·OS134 </span><span·class="c1">%·erl·-make</span></code></pre><p>The·<code·class="inline">erlc</code>·program·provides·way·to·compile·modules·from·the·OS
135 shell,·see·the·<a·href="../../erts-15.2.6/doc/html/erlc_cmd.html">erlc</a>·executable·in·ERTS.·It135 shell,·see·the·<a·href="../../erts-15.2.6/doc/html/erlc_cmd.html">erlc</a>·executable·in·ERTS.·It
136 understands·a·number·of·flags·that·can·be·used·to·define·macros,·add·search136 understands·a·number·of·flags·that·can·be·used·to·define·macros,·add·search
137 paths·for·include·files,·and·more.</p><pre><code·class="text">%·erlc·&lt;flags&gt;·File1.erl...FileN.erl</code></pre><p><a·href=""·id="loading"></a></p><h2·id="code-loading"·class="section-heading">137 paths·for·include·files,·and·more.</p><pre><code·class="text">%·erlc·&lt;flags&gt;·File1.erl...FileN.erl</code></pre><p><a·href=""·id="loading"></a></p><h2·id="code-loading"·class="section-heading">
Offset 156, 54 lines modifiedOffset 156, 54 lines modified
156 When·a·module·is·loaded·into·the·system·for·the·first·time,·the·code·becomes156 When·a·module·is·loaded·into·the·system·for·the·first·time,·the·code·becomes
157 'current'.·If·then·a·new·instance·of·the·module·is·loaded,·the·code·of·the157 'current'.·If·then·a·new·instance·of·the·module·is·loaded,·the·code·of·the
158 previous·instance·becomes·'old'·and·the·new·instance·becomes·'current'.</p><p>Both·old·and·current·code·is·valid,·and·can·be·evaluated·concurrently.·Fully158 previous·instance·becomes·'old'·and·the·new·instance·becomes·'current'.</p><p>Both·old·and·current·code·is·valid,·and·can·be·evaluated·concurrently.·Fully
159 qualified·function·calls·always·refer·to·current·code.·Old·code·can·still·be159 qualified·function·calls·always·refer·to·current·code.·Old·code·can·still·be
160 evaluated·because·of·processes·lingering·in·the·old·code.</p><p>If·a·third·instance·of·the·module·is·loaded,·the·code·server·removes·(purges)160 evaluated·because·of·processes·lingering·in·the·old·code.</p><p>If·a·third·instance·of·the·module·is·loaded,·the·code·server·removes·(purges)
161 the·old·code·and·any·processes·lingering·in·it·is·terminated.·Then·the·third161 the·old·code·and·any·processes·lingering·in·it·is·terminated.·Then·the·third
162 instance·becomes·'current'·and·the·previously·current·code·becomes·'old'.</p><p>To·change·from·old·code·to·current·code,·a·process·must·make·a·fully·qualified162 instance·becomes·'current'·and·the·previously·current·code·becomes·'old'.</p><p>To·change·from·old·code·to·current·code,·a·process·must·make·a·fully·qualified
163 function·call.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5631245661-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="5631245661-1">)</span><span·class="p">.</span><span·class="w"> 
164 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5631245661-2">(</span><span·class="p"·data-group-id="5631245661-3">[</span><span·class="ss">loop</span><span·class="p">/</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·84,·SHA:·f450cd4b716bbb3a18c668536bc7bf6d130f638c1e06e91b1f3b9c82b6c84cbf·...·]">)</span><span·class="p">.</span><span·class="w">163 function·call.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8521265107-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="852[·...·truncated·by·diffoscope;·len:·9,·SHA:·22c7dcc4bc4518b6310cf73d2abc077cdb5366db9af2f6b9cc711fe22c660315·...·]">)</span><span·class="p">.</span><span·class="w">
 164 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8521265107-2">(</span><span·class="p"·data-group-id="8521265107-3">[</span><span·class="ss">loop</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="8521265107-3">]</span><span·class="p"·data-group-id="8521265107-2">)</span><span·class="p">.</span><span·class="w">
  
165 </span><span·class="nf">loop</span><span·class="p"·data-group-id="5631245661-4">(</span><span·class="p"·data-group-id="5631245661-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">165 </span><span·class="nf">loop</span><span·class="p"·data-group-id="8521265107-4">(</span><span·class="p"·data-group-id="8521265107-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
166 ····</span><span·class="k">receive</span><span·class="w">166 ····</span><span·class="k">receive</span><span·class="w">
167 ········</span><span·class="ss">code_switch</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 ········</span><span·class="ss">code_switch</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 ············</span><span·class="nc">m</span><span·class="p">:</span><span·class="nf">loop</span><span·class="p"·data-group-id="5631245661-5">(</span><span·class="p"·data-group-id="5631245661-5">)</span><span·class="p">;</span><span·class="w">168 ············</span><span·class="nc">m</span><span·class="p">:</span><span·class="nf">loop</span><span·class="p"·data-group-id="8521265107-5">(</span><span·class="p"·data-group-id="8521265107-5">)</span><span·class="p">;</span><span·class="w">
169 ········</span><span·class="n">Msg</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 ········</span><span·class="n">Msg</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">170 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
171 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="5631245661-6">(</span><span·class="p"·data-group-id="5631245661-6">)</span><span·class="w">171 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8521265107-6">(</span><span·class="p"·data-group-id="8521265107-6">)</span><span·class="w">
172 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>To·make·the·process·change·code,·send·the·message·<code·class="inline">code_switch</code>·to·it.·The172 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>To·make·the·process·change·code,·send·the·message·<code·class="inline">code_switch</code>·to·it.·The
173 process·then·makes·a·fully·qualified·call·to·<code·class="inline">m:loop()</code>·and·changes·to·current173 process·then·makes·a·fully·qualified·call·to·<code·class="inline">m:loop()</code>·and·changes·to·current
174 code.·Notice·that·<code·class="inline">m:loop/0</code>·must·be·exported.</p><p>For·code·replacement·of·funs·to·work,·use·the·syntax174 code.·Notice·that·<code·class="inline">m:loop/0</code>·must·be·exported.</p><p>For·code·replacement·of·funs·to·work,·use·the·syntax
175 <code·class="inline">fun·Module:FunctionName/Arity</code>.</p><p><a·href=""·id="on_load"></a></p><h2·id="running-a-function-when-a-module-is-loaded"·class="section-heading">175 <code·class="inline">fun·Module:FunctionName/Arity</code>.</p><p><a·href=""·id="on_load"></a></p><h2·id="running-a-function-when-a-module-is-loaded"·class="section-heading">
176 ··<a·href="#running-a-function-when-a-module-is-loaded"·class="hover-link">176 ··<a·href="#running-a-function-when-a-module-is-loaded"·class="hover-link">
177 ····<i·class="ri-link-m"·aria-hidden="true"></i>177 ····<i·class="ri-link-m"·aria-hidden="true"></i>
178 ··</a>178 ··</a>
179 ··<span·class="text">Running·a·Function·When·a·Module·is·Loaded</span>179 ··<span·class="text">Running·a·Function·When·a·Module·is·Loaded</span>
180 </h2>180 </h2>
181 <p>The·<code·class="inline">-on_load()</code>·directive·names·a·function·that·is·to·be·run·automatically·when181 <p>The·<code·class="inline">-on_load()</code>·directive·names·a·function·that·is·to·be·run·automatically·when
182 a·module·is·loaded.</p><p>Its·syntax·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="0761578203-1">(</span><span·class="n">Name</span><span·class="o">/</span><span·class="mi">0</span><span·class="p"·data-group-id="0761578203-1">)</span><span·class="p">.</span></code></pre><p>It·is·not·necessary·to·export·the·function.·It·is·called·in·a·freshly·spawned182 a·module·is·loaded.</p><p>Its·syntax·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="4453331181-1">(</span><span·class="n">Name</span><span·class="o">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4453331181-1">)</span><span·class="p">.</span></code></pre><p>It·is·not·necessary·to·export·the·function.·It·is·called·in·a·freshly·spawned
183 process·(which·terminates·as·soon·as·the·function·returns).</p><p>The·function·must·return·<code·class="inline">ok</code>·if·the·module·is·to·become·the·new·current·code183 process·(which·terminates·as·soon·as·the·function·returns).</p><p>The·function·must·return·<code·class="inline">ok</code>·if·the·module·is·to·become·the·new·current·code
184 for·the·module·and·become·callable.</p><p>Returning·any·other·value·or·generating·an·exception·causes·the·new·code·to·be184 for·the·module·and·become·callable.</p><p>Returning·any·other·value·or·generating·an·exception·causes·the·new·code·to·be
185 unloaded.·If·the·return·value·is·not·an·atom,·a·warning·error·report·is·sent·to185 unloaded.·If·the·return·value·is·not·an·atom,·a·warning·error·report·is·sent·to
186 the·error·logger.</p><p>If·there·already·is·current·code·for·the·module,·that·code·will·remain·current186 the·error·logger.</p><p>If·there·already·is·current·code·for·the·module,·that·code·will·remain·current
187 and·can·be·called·until·the·<code·class="inline">on_load</code>·function·has·returned.·If·the·<code·class="inline">on_load</code>187 and·can·be·called·until·the·<code·class="inline">on_load</code>·function·has·returned.·If·the·<code·class="inline">on_load</code>
188 function·fails,·the·current·code·(if·any)·will·remain·current.·If·there·is·no188 function·fails,·the·current·code·(if·any)·will·remain·current.·If·there·is·no
189 current·code·for·a·module,·any·process·that·makes·an·external·call·to·the·module189 current·code·for·a·module,·any·process·that·makes·an·external·call·to·the·module
190 before·the·<code·class="inline">on_load</code>·function·has·finished·will·be·suspended·until·the·<code·class="inline">on_load</code>190 before·the·<code·class="inline">on_load</code>·function·has·finished·will·be·suspended·until·the·<code·class="inline">on_load</code>
191 function·have·finished.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·19,·if·the·<code·class="inline">on_load</code>·function·failed,·any·previously·current191 function·have·finished.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·19,·if·the·<code·class="inline">on_load</code>·function·failed,·any·previously·current
192 code·would·become·old,·essentially·leaving·the·system·without·any·working·and192 code·would·become·old,·essentially·leaving·the·system·without·any·working·and
193 reachable·instance·of·the·module.</p></section><p>In·embedded·mode,·first·all·modules·are·loaded.·Then·all·<code·class="inline">on_load</code>·functions·are193 reachable·instance·of·the·module.</p></section><p>In·embedded·mode,·first·all·modules·are·loaded.·Then·all·<code·class="inline">on_load</code>·functions·are
194 called.·The·system·is·terminated·unless·all·of·the·<code·class="inline">on_load</code>·functions·return194 called.·The·system·is·terminated·unless·all·of·the·<code·class="inline">on_load</code>·functions·return
195 <code·class="inline">ok</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1704425961-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="1704425961-1">)</span><span·class="p">.</span><span·class="w">195 <code·class="inline">ok</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3742243772-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="3742243772-1">)</span><span·class="p">.</span><span·class="w">
196 </span><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="1704425961-2">(</span><span·class="ss">load_my_nifs</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="1704425961-2">)</span><span·class="p">.</span><span·class="w">196 </span><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="3742243772-2">(</span><span·class="ss">load_my_nifs</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3742243772-2">)</span><span·class="p">.</span><span·class="w">
  
197 </span><span·class="nf">load_my_nifs</span><span·class="p"·data-group-id="1704425961-3">(</span><span·class="p"·data-group-id="1704425961-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">197 </span><span·class="nf">load_my_nifs</span><span·class="p"·data-group-id="3742243772-3">(</span><span·class="p"·data-group-id="3742243772-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
198 ····</span><span·class="n">NifPath</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%Set·up·the·path·to·the·NIF·library.</span><span·class="w">198 ····</span><span·class="n">NifPath</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%Set·up·the·path·to·the·NIF·library.</span><span·class="w">
199 ····</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%Initialize·the·Info·term</span><span·class="w">199 ····</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%Initialize·the·Info·term</span><span·class="w">
200 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="1704425961-4">(</span><span·class="n">NifPath</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="1704425961-4">)</span><span·class="p">.</span></code></pre><p>If·the·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#load_nif/2"><code·class="inline">erlang:load_nif/2</code></a>·fails,·the·module·is·unloaded·and·a·warning200 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="3742243772-4">(</span><span·class="n">NifPath</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="3742243772-4">)</span><span·class="p">.</span></code></pre><p>If·the·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#load_nif/2"><code·class="inline">erlang:load_nif/2</code></a>·fails,·the·module·is·unloaded·and·a·warning
201 report·is·sent·to·the·error·loader.</p>201 report·is·sent·to·the·error·loader.</p>
202 </div>202 </div>
  
203 <div·class="bottom-actions"·id="bottom-actions">203 <div·class="bottom-actions"·id="bottom-actions">
204 ··<div·class="bottom-actions-item">204 ··<div·class="bottom-actions-item">
  
205 ······<a·href="distributed.html"·class="bottom-actions-button"·rel="prev">205 ······<a·href="distributed.html"·class="bottom-actions-button"·rel="prev">
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248 ········Built·using248 ········Built·using
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250 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>250 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
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118 <p>This·section·lists·a·few·constructs·to·watch·out·for.</p><h2·id="operator"·class="section-heading">118 <p>This·section·lists·a·few·constructs·to·watch·out·for.</p><h2·id="operator"·class="section-heading">
119 ··<a·href="#operator"·class="hover-link">119 ··<a·href="#operator"·class="hover-link">
120 ····<i·class="ri-link-m"·aria-hidden="true"></i>120 ····<i·class="ri-link-m"·aria-hidden="true"></i>
121 ··</a>121 ··</a>
122 ··<span·class="text">Operator·<code·class="inline">++</code></span>122 ··<span·class="text">Operator·<code·class="inline">++</code></span>
123 </h2>123 </h2>
124 <p>The·<code·class="inline">++</code>·operator·copies·its·left-hand·side·operand.·That·is·clearly124 <p>The·<code·class="inline">++</code>·operator·copies·its·left-hand·side·operand.·That·is·clearly
125 seen·if·we·do·our·own·implementation·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_plus_plus</span><span·class="p"·data-group-id="2016302837-1">(</span><span·class="p"·data-group-id="2016302837-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="2016302837-2">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·60,·SHA:·35780112f30bbfa2dd425c15cf4175ef93b368f662d9d9cbd4b4defaf2bcae34·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">125 seen·if·we·do·our·own·implementation·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_plus_plus</span><span·class="p"·data-group-id="4480634028-1">(</span><span·class="p"·data-group-id="4480634028-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="4480634028-2">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·60,·SHA:·bf74f357c98a7041618b707365e39b2c99570f2906417e045dd7bed8c72eefb8·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
126 ····</span><span·class="p"·data-group-id="2016302837-3">[</span><span·class="n">H</span><span·class="p">|</span><span·class="nf">my_plus_plus</span><span·class="p"·data-group-id="2016302837-4">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</spa[·...·truncated·by·diffoscope;·len:·96,·SHA:·eafd4c3b4be84c9fe05f9274c66cd98fae582410b18de566c01641d7536e462b·...·]-3">]</span><span·class="p">;</span><span·class="w">126 ····</span><span·class="p"·data-group-id="4480634028-3">[</span><span·class="n">H</span><span·class="p">|</span><span·class="nf">my_plus_plus</span><span·class="p"·data-group-id="4480634028-4">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</spa[·...·truncated·by·diffoscope;·len:·96,·SHA:·d55b28fd956d4ae01d0e42e8912fbb3cd3f09ea0408d1cb34ad3178573ebb98e·...·]-3">]</span><span·class="p">;</span><span·class="w">
127 </span><span·class="nf">my_plus_plus</span><span·class="p"·data-group-id="2016302837-5">(</span><span·class="p"·data-group-id="2016302837-6">[</span><span·class="p"·data-group-id="2016302837-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</span><span·class="p"·data-group-id="2016302837-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">127 </span><span·class="nf">my_plus_plus</span><span·class="p"·data-group-id="4480634028-5">(</span><span·class="p"·data-group-id="4480634028-6">[</span><span·class="p"·data-group-id="4480634028-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</span><span·class="p"·data-group-id="4480634028-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
128 ····</span><span·class="n">Tail</span><span·class="p">.</span></code></pre><p>We·must·be·careful·how·we·use·<code·class="inline">++</code>·in·a·loop.·First·is·how·not·to·use·it:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">naive_reverse</span><span·class="p"·data-group-id="1191837566-1">(</span><span·class="p"·data-group-id="1191837566-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="1191837566-2">]</span><span·class="p"·data-group-id="1191837566-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">128 ····</span><span·class="n">Tail</span><span·class="p">.</span></code></pre><p>We·must·be·careful·how·we·use·<code·class="inline">++</code>·in·a·loop.·First·is·how·not·to·use·it:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">naive_reverse</span><span·class="p"·data-group-id="1021675109-1">(</span><span·class="p"·data-group-id="1021675109-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="1021675109-2">]</span><span·class="p"·data-group-id="1021675109-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
129 ····</span><span·class="nf">naive_reverse</span><span·class="p"·data-group-id="1191837566-3">(</span><span·class="n">T</span><span·class="p"·data-group-id="1191837566-3">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="1191837566-4">[</span><span·class="n">H</span><span·cl[·...·truncated·by·diffoscope;·len:·33,·SHA:·da2de8ccf7a958d2b3d0c45478160f652a2edc4ce959b84d23748893a17a20db·...·]-4">]</span><span·class="p">;</span><span·class="w">129 ····</span><span·class="nf">naive_reverse</span><span·class="p"·data-group-id="1021675109-3">(</span><span·class="n">T</span><span·class="p"·data-group-id="1021675109-3">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="1021675109-4">[</span><span·class="n">H</span><span·cl[·...·truncated·by·diffoscope;·len:·33,·SHA:·ee7f3c7929929713b131cc604d72d4a947e0aae285d0843e76ed9b294f48f5bc·...·]-4">]</span><span·class="p">;</span><span·class="w">
130 </span><span·class="nf">naive_reverse</span><span·class="p"·data-group-id="1191837566-5">(</span><span·class="p"·data-group-id="1191837566-6">[</span><span·class="p"·data-group-id="1191837566-6">]</span><span·class="p"·data-group-id="1191837566-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">130 </span><span·class="nf">naive_reverse</span><span·class="p"·data-group-id="1021675109-5">(</span><span·class="p"·data-group-id="1021675109-6">[</span><span·class="p"·data-group-id="1021675109-6">]</span><span·class="p"·data-group-id="1021675109-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
131 ····</span><span·class="p"·data-group-id="1191837566-7">[</span><span·class="p"·data-group-id="1191837566-7">]</span><span·class="p">.</span></code></pre><p>As·the·<code·class="inline">++</code>·operator·copies·its·left-hand·side·operand,·the·growing131 ····</span><span·class="p"·data-group-id="1021675109-7">[</span><span·class="p"·data-group-id="1021675109-7">]</span><span·class="p">.</span></code></pre><p>As·the·<code·class="inline">++</code>·operator·copies·its·left-hand·side·operand,·the·growing
132 result·is·copied·repeatedly,·leading·to·quadratic·complexity.</p><p>On·the·other·hand,·using·<code·class="inline">++</code>·in·loop·like·this·is·perfectly·fine:</p><p><strong>OK</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="3819108367-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="3819108367-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">132 result·is·copied·repeatedly,·leading·to·quadratic·complexity.</p><p>On·the·other·hand,·using·<code·class="inline">++</code>·in·loop·like·this·is·perfectly·fine:</p><p><strong>OK</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="1490687669-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="1490687669-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
133 ····</span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="3819108367-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3819108367-3">[</span><span·class="p"·data-group-id="3819108367-3">]</span><span·class="p"·data-group-id="3819108367-2">)</span><span·class="p">.</span><span·class="w">133 ····</span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="1490687669-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1490687669-3">[</span><span·class="p"·data-group-id="1490687669-3">]</span><span·class="p"·data-group-id="1490687669-2">)</span><span·class="p">.</span><span·class="w">
  
134 </span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="3819108367-4">(</span><span·class="p"·data-group-id="3819108367-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="3819108367-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·3751433ac7c1ff3ce845a3b44160260f6728a7b3756d1f3f2bb62fedb58af31d·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">134 </span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="1490687669-4">(</span><span·class="p"·data-group-id="1490687669-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="1490687669-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·52ffd907175f247691b43934491f62a2520402f9bf5e944363ed1705043a5d3e·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
135 ····</span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="3819108367-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3819108367-7">[</span><span·class="n">H</span><span·class="p"·data-group-id="3819108367-7">]</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·108,·SHA:·fec9fcc011dd79ef870ff4fcc29b7d4c46ac358168558887d3164d2d16a262d7·...·]-6">)</span><span·class="p">;</span><span·class="w">135 ····</span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="1490687669-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1490687669-7">[</span><span·class="n">H</span><span·class="p"·data-group-id="1490687669-7">]</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·108,·SHA:·e3432658a2db9767f856cea8c5ec986429c747f93be9521ed8b6d18be38f7c03·...·]-6">)</span><span·class="p">;</span><span·class="w">
136 </span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="3819108367-8">(</span><span·class="p"·data-group-id="3819108367-9">[</span><span·class="p"·data-group-id="3819108367-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="3819108367-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">136 </span><span·class="nf">naive_but_ok_reverse</span><span·class="p"·data-group-id="1490687669-8">(</span><span·class="p"·data-group-id="1490687669-9">[</span><span·class="p"·data-group-id="1490687669-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="1490687669-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
137 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>Each·list·element·is·copied·only·once.·The·growing·result·<code·class="inline">Acc</code>·is·the·right-hand137 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>Each·list·element·is·copied·only·once.·The·growing·result·<code·class="inline">Acc</code>·is·the·right-hand
138 side·operand,·which·it·is·<em>not</em>·copied.</p><p>Experienced·Erlang·programmers·would·probably·write·as·follows:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">vanilla_reverse</span><span·class="p"·data-group-id="9691388009-1">(</span><span·class="p"·data-group-id="9691388009-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="9691388009-2">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·39ce2d40683e8fa2423b02fa3b863aa9c9ab702a42b9100cd1362e03f7cfa869·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 side·operand,·which·it·is·<em>not</em>·copied.</p><p>Experienced·Erlang·programmers·would·probably·write·as·follows:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">vanilla_reverse</span><span·class="p"·data-group-id="3853300487-1">(</span><span·class="p"·data-group-id="3853300487-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="3853300487-2">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·fa067fdb38f404c885d13c01dffdba9567c12b82cb884fab2ad98d0c3fcbc748·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ····</span><span·class="nf">vanilla_reverse</span><span·class="p"·data-group-id="9691388009-3">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9691388009-4">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="9691[·...·truncated·by·diffoscope;·len:·59,·SHA:·57e62cf6a6f8abcecac60975a51ed5d04025bc1f2041fcd036631e44c6976fd8·...·]-3">)</span><span·class="p">;</span><span·class="w">139 ····</span><span·class="nf">vanilla_reverse</span><span·class="p"·data-group-id="3853300487-3">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3853300487-4">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="3853[·...·truncated·by·diffoscope;·len:·59,·SHA:·d8af437184fc47df598651ae8e4b3ed08ba967363064c063b88c90ca4ebb6d54·...·]-3">)</span><span·class="p">;</span><span·class="w">
140 </span><span·class="nf">vanilla_reverse</span><span·class="p"·data-group-id="9691388009-5">(</span><span·class="p"·data-group-id="9691388009-6">[</span><span·class="p"·data-group-id="9691388009-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="9691388009-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">140 </span><span·class="nf">vanilla_reverse</span><span·class="p"·data-group-id="3853300487-5">(</span><span·class="p"·data-group-id="3853300487-6">[</span><span·class="p"·data-group-id="3853300487-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="3853300487-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
141 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>In·principle,·this·is·slightly·more·efficient·because·the·list·element·<code·class="inline">[H]</code>141 ····</span><span·class="n">Acc</span><span·class="p">.</span></code></pre><p>In·principle,·this·is·slightly·more·efficient·because·the·list·element·<code·class="inline">[H]</code>
142 is·not·built·before·being·copied·and·discarded.·In·practice,·the·compiler142 is·not·built·before·being·copied·and·discarded.·In·practice,·the·compiler
143 rewrites·<code·class="inline">[H]·++·Acc</code>·to·<code·class="inline">[H|Acc]</code>.</p><h2·id="timer-module"·class="section-heading">143 rewrites·<code·class="inline">[H]·++·Acc</code>·to·<code·class="inline">[H|Acc]</code>.</p><h2·id="timer-module"·class="section-heading">
144 ··<a·href="#timer-module"·class="hover-link">144 ··<a·href="#timer-module"·class="hover-link">
145 ····<i·class="ri-link-m"·aria-hidden="true"></i>145 ····<i·class="ri-link-m"·aria-hidden="true"></i>
146 ··</a>146 ··</a>
147 ··<span·class="text">Timer·Module</span>147 ··<span·class="text">Timer·Module</span>
Offset 160, 77 lines modifiedOffset 160, 77 lines modified
160 therefore·harmless.</p><h2·id="accidental-copying-and-loss-of-sharing"·class="section-heading">160 therefore·harmless.</p><h2·id="accidental-copying-and-loss-of-sharing"·class="section-heading">
161 ··<a·href="#accidental-copying-and-loss-of-sharing"·class="hover-link">161 ··<a·href="#accidental-copying-and-loss-of-sharing"·class="hover-link">
162 ····<i·class="ri-link-m"·aria-hidden="true"></i>162 ····<i·class="ri-link-m"·aria-hidden="true"></i>
163 ··</a>163 ··</a>
164 ··<span·class="text">Accidental·Copying·and·Loss·of·Sharing</span>164 ··<span·class="text">Accidental·Copying·and·Loss·of·Sharing</span>
165 </h2>165 </h2>
166 <p>When·spawning·a·new·process·using·a·fun,·one·can·accidentally·copy·more·data·to166 <p>When·spawning·a·new·process·using·a·fun,·one·can·accidentally·copy·more·data·to
167 the·process·than·intended.·For·example:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">accidental1</span><span·class="p"·data-group-id="4686852585-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="4686852585-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 the·process·than·intended.·For·example:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">accidental1</span><span·class="p"·data-group-id="3204588252-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="3204588252-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4686852585-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4686852585-3">(</span><span·class="p"·data-group-id="4686852585-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">168 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="3204588252-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3204588252-3">(</span><span·class="p"·data-group-id="3204588252-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
169 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4686852585-4">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4686852585-5">[</span><span·class="n">State</span><span·class="o">#</[·...·truncated·by·diffoscope;·len:·180,·SHA:·85be99d24fbf008bce01a0ce220484d1b29736c0c61b26368f4a2c83fbac8163·...·]-4">)</span><span·class="w">169 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3204588252-4">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3204588252-5">[</span><span·class="n">State</span><span·class="o">#</[·...·truncated·by·diffoscope;·len:·180,·SHA:·624eff406b6e6e7f9ebbb1e30103407ab106af17e653f5658a754f41d12a60c2·...·]-4">)</span><span·class="w">
170 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="4686852585-2">)</span><span·class="p">.</span></code></pre><p>The·code·in·the·fun·will·extract·one·element·from·the·record·and·print·it.·The170 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="3204588252-2">)</span><span·class="p">.</span></code></pre><p>The·code·in·the·fun·will·extract·one·element·from·the·record·and·print·it.·The
171 rest·of·the·<code·class="inline">state</code>·record·is·not·used.·However,·when·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/1"><code·class="inline">spawn/1</code></a>171 rest·of·the·<code·class="inline">state</code>·record·is·not·used.·However,·when·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/1"><code·class="inline">spawn/1</code></a>
172 function·is·executed,·the·entire·record·is·copied·to·the·newly·created·process.</p><p>The·same·kind·of·problem·can·happen·with·a·map:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">accidental2</span><span·class="p"·data-group-id="3641773424-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="3641773424-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 function·is·executed,·the·entire·record·is·copied·to·the·newly·created·process.</p><p>The·same·kind·of·problem·can·happen·with·a·map:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">accidental2</span><span·class="p"·data-group-id="4362303780-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="4362303780-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="3641773424-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3641773424-3">(</span><span·class="p"·data-group-id="3641773424-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4362303780-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4362303780-3">(</span><span·class="p"·data-group-id="4362303780-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3641773424-4">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3641773424-5">[</span><span·class="nf">map_get</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·288,·SHA:·79144832c8b80ea52595e85cc8fa92909e2e896acbbe1eacb7d881109d2ef077·...·]-4">)</span><span·class="w">174 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4362303780-4">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4362303780-5">[</span><span·class="nf">map_get</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·288,·SHA:·671c84da28e40695e6f5133b5b1e360f31a5181908ce9d0a9425a5f379a6a6c6·...·]-4">)</span><span·class="w">
175 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="3641773424-2">)</span><span·class="p">.</span></code></pre><p>In·the·following·example·(part·of·a·module·implementing·the·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>175 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="4362303780-2">)</span><span·class="p">.</span></code></pre><p>In·the·following·example·(part·of·a·module·implementing·the·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>
176 behavior)·the·created·fun·is·sent·to·another·process:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_call</span><span·class="p"·data-group-id="5985690433-1">(</span><span·class="ss">give_me_a_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·ff87f8d8b204b95a569d6e52d7c4f9bc5811f86dd0f2302902349c1693656066·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 behavior)·the·created·fun·is·sent·to·another·process:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_call</span><span·class="p"·data-group-id="1557301587-1">(</span><span·class="ss">give_me_a_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·45b483da5dada00626c1ffdf286c848d4762f2f17489dc44abe368e0d1d293e0·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ····</span><span·class="n">Fun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="5985690433-2">(</span><span·class="p"·data-group-id="5985690433-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="nb">size</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">177 ····</span><span·class="n">Fun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1557301587-2">(</span><span·class="p"·data-group-id="1557301587-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="nb">size</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
178 ····</span><span·class="p"·data-group-id="5985690433-3">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="5985690433-3">}</span><span·class="p">.</span></code></pre><p>How·bad·that·unnecessary·copy·is·depends·on·the·contents·of·the·record·or·the178 ····</span><span·class="p"·data-group-id="1557301587-3">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1557301587-3">}</span><span·class="p">.</span></code></pre><p>How·bad·that·unnecessary·copy·is·depends·on·the·contents·of·the·record·or·the
179 map.</p><p>For·example,·if·the·<code·class="inline">state</code>·record·is·initialized·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init1</span><span·class="p"·data-group-id="0114121320-1">(</span><span·class="p"·data-group-id="0114121320-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">179 map.</p><p>For·example,·if·the·<code·class="inline">state</code>·record·is·initialized·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init1</span><span·class="p"·data-group-id="6017841957-1">(</span><span·class="p"·data-group-id="6017841957-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
180 ····</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="0114121320-2">{</span><span·class="ss">data</span><span·class="o">=</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0114121320-3">(</span><span·class="mi">1</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·147,·SHA:·0d9c2a3bdc4ebaca102092a3b60b3df583be05aeec456ea410123c6886c1e0d8·...·]-2">}</span><span·class="p">.</span></code></pre><p>a·list·with·10000·elements·(or·about·20000·heap·words)·will·be·copied·to·the180 ····</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="6017841957-2">{</span><span·class="ss">data</span><span·class="o">=</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="6017841957-3">(</span><span·class="mi">1</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·147,·SHA:·64923380f3c1ebbe82ae3633699227cc1e2e67b804f61f1868311fb3a5d6eb27·...·]-2">}</span><span·class="p">.</span></code></pre><p>a·list·with·10000·elements·(or·about·20000·heap·words)·will·be·copied·to·the
181 newly·created·process.</p><p>An·unnecessary·copy·of·10000·element·list·can·be·bad·enough,·but·it·can·get·even181 newly·created·process.</p><p>An·unnecessary·copy·of·10000·element·list·can·be·bad·enough,·but·it·can·get·even
182 worse·if·the·<code·class="inline">state</code>·record·contains·<em>shared·subterms</em>.·Here·is·a·simple·example182 worse·if·the·<code·class="inline">state</code>·record·contains·<em>shared·subterms</em>.·Here·is·a·simple·example
183 of·a·term·with·a·shared·subterm:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6447511840-1">{</span><span·class="n">SubTerm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SubTerm</span><span·class="p"·data-group-id="6447511840-1">}</span></code></pre><p>When·a·term·is·copied·to·another·process,·sharing·of·subterms·will·be·lost·and183 of·a·term·with·a·shared·subterm:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6069152070-1">{</span><span·class="n">SubTerm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SubTerm</span><span·class="p"·data-group-id="6069152070-1">}</span></code></pre><p>When·a·term·is·copied·to·another·process,·sharing·of·subterms·will·be·lost·and
184 the·copied·term·can·be·many·times·larger·than·the·original·term.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init2</span><span·class="p"·data-group-id="2639135430-1">(</span><span·class="p"·data-group-id="2639135430-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 the·copied·term·can·be·many·times·larger·than·the·original·term.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init2</span><span·class="p"·data-group-id="8933063962-1">(</span><span·class="p"·data-group-id="8933063962-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ····</span><span·class="n">SharedSubTerms</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="2639135430-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="2639135430-3">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="2639135430-3">)</span><span[·...·truncated·by·diffoscope;·len:·852,·SHA:·6a1dfd7ced8864df98b29eb06120f4881490d77be2d7e8672c4defec46b9d850·...·]-2">)</span><span·class="p">,</span><span·class="w">185 ····</span><span·class="n">SharedSubTerms</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="8933063962-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="8933063962-3">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="8933063962-3">)</span><span[·...·truncated·by·diffoscope;·len:·852,·SHA:·cc710cb1073d71545cdbb498ae9cf7c09d661234b2ee9361b4098d69e5183403·...·]-2">)</span><span·class="p">,</span><span·class="w">
186 ····</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="2639135430-7">{</span><span·class="ss">data</span><span·class="o">=</span><span·class="n">Shared</span><span·class="p"·data-group-id="2639135430-7">}</span><span·class="p">.</span></code></pre><p>In·the·process·that·calls·<code·class="inline">init2/0</code>,·the·size·of·the·<code·class="inline">data</code>·field·in·the·<code·class="inline">state</code>186 ····</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="8933063962-7">{</span><span·class="ss">data</span><span·class="o">=</span><span·class="n">Shared</span><span·class="p"·data-group-id="8933063962-7">}</span><span·class="p">.</span></code></pre><p>In·the·process·that·calls·<code·class="inline">init2/0</code>,·the·size·of·the·<code·class="inline">data</code>·field·in·the·<code·class="inline">state</code>
187 record·will·be·32·heap·words.·When·the·record·is·copied·to·the·newly·created187 record·will·be·32·heap·words.·When·the·record·is·copied·to·the·newly·created
188 process,·sharing·will·be·lost·and·the·size·of·the·copied·<code·class="inline">data</code>·field·will·be188 process,·sharing·will·be·lost·and·the·size·of·the·copied·<code·class="inline">data</code>·field·will·be
189 131070·heap·words.·More·details·about189 131070·heap·words.·More·details·about
190 <a·href="eff_guide_processes.html#loss-of-sharing">loss·off·sharing</a>·are·found·in·a·later190 <a·href="eff_guide_processes.html#loss-of-sharing">loss·off·sharing</a>·are·found·in·a·later
191 section.</p><p>To·avoid·the·problem,·outside·of·the·fun·extract·only·the·fields·of·the·record191 section.</p><p>To·avoid·the·problem,·outside·of·the·fun·extract·only·the·fields·of·the·record
192 that·are·actually·used:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fixed_accidental1</span><span·class="p"·data-group-id="2581220652-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="2581220652-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 that·are·actually·used:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fixed_accidental1</span><span·class="p"·data-group-id="2253127379-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="2253127379-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">193 ····</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">
194 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2581220652-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="2581220652-3">(</span><span·class="p"·data-group-id="2581220652-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2253127379-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="2253127379-3">(</span><span·class="p"·data-group-id="2253127379-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2581220652-4">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2581220652-5">[</span><span·class="n">Info</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·73,·SHA:·fca67c0e8a2963bf6a38dda452c8c11aea37ed9a7309bd76a40187c69e6a7b46·...·]-4">)</span><span·class="w">195 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2253127379-4">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2253127379-5">[</span><span·class="n">Info</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·73,·SHA:·7f2228731fd5ba21831640450d29ebf92d1fc4f9a9eba3be3ef96263fe584eb0·...·]-4">)</span><span·class="w">
196 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="2581220652-2">)</span><span·class="p">.</span></code></pre><p>Similarly,·outside·of·the·fun·extract·only·the·map·elements·that·are·actually196 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="2253127379-2">)</span><span·class="p">.</span></code></pre><p>Similarly,·outside·of·the·fun·extract·only·the·map·elements·that·are·actually
197 used:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fixed_accidental2</span><span·class="p"·data-group-id="6712785689-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="6712785689-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">197 used:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fixed_accidental2</span><span·class="p"·data-group-id="1674346463-1">(</span><span·class="n">State</span><span·class="p"·data-group-id="1674346463-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
198 ····</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">map_get</span><span·class="p"·data-group-id="6712785689-2">(</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="6712785689-2">)</span><span·class="p">,</span><span·class="w">198 ····</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">map_get</span><span·class="p"·data-group-id="1674346463-2">(</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1674346463-2">)</span><span·class="p">,</span><span·class="w">
199 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="6712785689-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="6712785689-4">(</span><span·class="p"·data-group-id="6712785689-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">199 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1674346463-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="1674346463-4">(</span><span·class="p"·data-group-id="1674346463-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
200 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6712785689-5">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6712785689-6">[</span><span·class="n">Info</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·74,·SHA:·fa4b7aadb9d52af78393e70ae5aa5a0dedb5394841692f18515566df430a69b6·...·]-5">)</span><span·class="w">200 ··················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1674346463-5">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1674346463-6">[</span><span·class="n">Info</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·74,·SHA:·11419a44c9881501d026ae1801a9f3b653cdf29e78ba11c25120bbc6f20bc36f·...·]-5">)</span><span·class="w">
201 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="6712785689-3">)</span><span·class="p">.</span></code></pre><h2·id="list_to_atom-1"·class="section-heading">201 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="1674346463-3">)</span><span·class="p">.</span></code></pre><h2·id="list_to_atom-1"·class="section-heading">
202 ··<a·href="#list_to_atom-1"·class="hover-link">202 ··<a·href="#list_to_atom-1"·class="hover-link">
203 ····<i·class="ri-link-m"·aria-hidden="true"></i>203 ····<i·class="ri-link-m"·aria-hidden="true"></i>
204 ··</a>204 ··</a>
205 ··<span·class="text">list_to_atom/1</span>205 ··<span·class="text">list_to_atom/1</span>
206 </h2>206 </h2>
207 <p>Atoms·are·not·garbage-collected.·Once·an·atom·is·created,·it·is·never·removed.207 <p>Atoms·are·not·garbage-collected.·Once·an·atom·is·created,·it·is·never·removed.
208 The·emulator·terminates·if·the·limit·for·the·number·of·atoms·(1,048,576·by208 The·emulator·terminates·if·the·limit·for·the·number·of·atoms·(1,048,576·by
209 default)·is·reached.</p><p>Therefore,·converting·arbitrary·input·strings·to·atoms·can·be·dangerous·in·a209 default)·is·reached.</p><p>Therefore,·converting·arbitrary·input·strings·to·atoms·can·be·dangerous·in·a
210 system·that·runs·continuously.·If·only·certain·well-defined·atoms·are·allowed·as210 system·that·runs·continuously.·If·only·certain·well-defined·atoms·are·allowed·as
211 input,·<a·href="../../erts-15.2.6/doc/html/erlang.html#list_to_existing_atom/1"><code·class="inline">list_to_existing_atom/1</code></a>·or211 input,·<a·href="../../erts-15.2.6/doc/html/erlang.html#list_to_existing_atom/1"><code·class="inline">list_to_existing_atom/1</code></a>·or
212 <a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_existing_atom/1"><code·class="inline">binary_to_existing_atom/1</code></a>·can·be·used212 <a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_existing_atom/1"><code·class="inline">binary_to_existing_atom/1</code></a>·can·be·used
213 to·guard·against·a·denial-of-service·attack.·(All·atoms·that·are·allowed·must213 to·guard·against·a·denial-of-service·attack.·(All·atoms·that·are·allowed·must
214 have·been·created·earlier,·for·example,·by·using·all·of·them·in·a·module214 have·been·created·earlier,·for·example,·by·using·all·of·them·in·a·module
215 and·loading·that·module.)</p><p>Using·<a·href="../../erts-15.2.6/doc/html/erlang.html#list_to_atom/1"><code·class="inline">list_to_atom/1</code></a>·to·construct·an·atom·that215 and·loading·that·module.)</p><p>Using·<a·href="../../erts-15.2.6/doc/html/erlang.html#list_to_atom/1"><code·class="inline">list_to_atom/1</code></a>·to·construct·an·atom·that
216 is·passed·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply/3</code></a>·is·quite·expensive.</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">apply</span><span·class="p"·data-group-id="0763691515-1">(</span><span·class="nf">list_to_atom</span><span·class="p"·data-group-id="0763691515-2">(</span><span·class="s">&quot;some_prefix&quot;</span><span·class="o">++</span><span·class="n">Var</span><span·class="p"·data-group-id="0763691515-2">)</[·...·truncated·by·diffoscope;·len:·196,·SHA:·d33d7bb6db54ac9a79907fae1209901d6da7092bb4e302d0550cf900da625197·...·]-1">)</span></code></pre><h2·id="length-1"·class="section-heading">216 is·passed·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply/3</code></a>·is·quite·expensive.</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">apply</span><span·class="p"·data-group-id="8489515404-1">(</span><span·class="nf">list_to_atom</span><span·class="p"·data-group-id="8489515404-2">(</span><span·class="s">&quot;some_prefix&quot;</span><span·class="o">++</span><span·class="n">Var</span><span·class="p"·data-group-id="8489515404-2">)</[·...·truncated·by·diffoscope;·len:·196,·SHA:·f7fb0b6a5df766366a362b09f8919173d8b447060d857c7a820d988d514914e6·...·]-1">)</span></code></pre><h2·id="length-1"·class="section-heading">
217 ··<a·href="#length-1"·class="hover-link">217 ··<a·href="#length-1"·class="hover-link">
218 ····<i·class="ri-link-m"·aria-hidden="true"></i>218 ····<i·class="ri-link-m"·aria-hidden="true"></i>
219 ··</a>219 ··</a>
220 ··<span·class="text">length/1</span>220 ··<span·class="text">length/1</span>
221 </h2>221 </h2>
222 <p>The·time·for·calculating·the·length·of·a·list·is·proportional·to·the·length·of222 <p>The·time·for·calculating·the·length·of·a·list·is·proportional·to·the·length·of
223 the·list,·as·opposed·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#tuple_size/1"><code·class="inline">tuple_size/1</code></a>,223 the·list,·as·opposed·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#tuple_size/1"><code·class="inline">tuple_size/1</code></a>,
224 <a·href="../../erts-15.2.6/doc/html/erlang.html#byte_size/1"><code·class="inline">byte_size/1</code></a>,·and·<a·href="../../erts-15.2.6/doc/html/erlang.html#bit_size/1"><code·class="inline">bit_size/1</code></a>,·which·all224 <a·href="../../erts-15.2.6/doc/html/erlang.html#byte_size/1"><code·class="inline">byte_size/1</code></a>,·and·<a·href="../../erts-15.2.6/doc/html/erlang.html#bit_size/1"><code·class="inline">bit_size/1</code></a>,·which·all
225 execute·in·constant·time.</p><p>Normally,·there·is·no·need·to·worry·about·the·speed·of·<a·href="../../erts-15.2.6/doc/html/erlang.html#length/1"><code·class="inline">length/1</code></a>,225 execute·in·constant·time.</p><p>Normally,·there·is·no·need·to·worry·about·the·speed·of·<a·href="../../erts-15.2.6/doc/html/erlang.html#length/1"><code·class="inline">length/1</code></a>,
226 because·it·is·efficiently·implemented·in·C.·In·time-critical·code,·you·might226 because·it·is·efficiently·implemented·in·C.·In·time-critical·code,·you·might
227 want·to·avoid·it·if·the·input·list·could·potentially·be·very·long.</p><p>Some·uses·of·<a·href="../../erts-15.2.6/doc/html/erlang.html#length/1"><code·class="inline">length/1</code></a>·can·be·replaced·by·matching.·For·example,227 want·to·avoid·it·if·the·input·list·could·potentially·be·very·long.</p><p>Some·uses·of·<a·href="../../erts-15.2.6/doc/html/erlang.html#length/1"><code·class="inline">length/1</code></a>·can·be·replaced·by·matching.·For·example,
228 the·following·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="8961689406-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="8961689406-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">length</span><span·class="p"·data-group-id="8961689406-2">(</span><span·class="n">L</span><span·class="p"·data-group-id="8961689406-2">)</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">3</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
229 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>can·be·rewritten·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="4508088966-1">(</span><span[·...·truncated·by·diffoscope;·len:·363,·SHA:·8dab573763e126c25d3a11f3ccbcc4a17c8ce28f23835135cf8a186b967f3ee4·...·]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">228 the·following·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="7300529580-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="7300529580-1">)</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·301,·SHA:·24a2a7782a69a9a4762e028ec11f87b721ead216121820396e579e2f1d5fdb8f·...·]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
 229 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>can·be·rewritten·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="3956605164-1">(</span><span·class="p"·data-group-id="3956605164-2">[</span><span·class="p">_</span><span·class="p">,</span><span·class="p">_</span><span·class="p">,</span><span·class="p">_</span><span·class="p">|</span><span·class="p">_</span><span·class="p"·data-group-id="3956605164-2">]</span><span·class="o">=</span><span·class="n">L</span><span·class="p"·data-group-id="3956605164-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
230 ···</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>One·slight·difference·is·that·<a·href="../../erts-15.2.6/doc/html/erlang.html#length/1"><code·class="inline">length(L)</code></a>·fails·if·<code·class="inline">L</code>·is·an230 ···</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>One·slight·difference·is·that·<a·href="../../erts-15.2.6/doc/html/erlang.html#length/1"><code·class="inline">length(L)</code></a>·fails·if·<code·class="inline">L</code>·is·an
231 improper·list,·while·the·pattern·in·the·second·code·fragment·accepts·an·improper231 improper·list,·while·the·pattern·in·the·second·code·fragment·accepts·an·improper
232 list.</p><h2·id="setelement-3"·class="section-heading">232 list.</p><h2·id="setelement-3"·class="section-heading">
233 ··<a·href="#setelement-3"·class="hover-link">233 ··<a·href="#setelement-3"·class="hover-link">
234 ····<i·class="ri-link-m"·aria-hidden="true"></i>234 ····<i·class="ri-link-m"·aria-hidden="true"></i>
235 ··</a>235 ··</a>
236 ··<span·class="text">setelement/3</span>236 ··<span·class="text">setelement/3</span>
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238 <p><a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·copies·the·tuple·it·modifies.·Therefore,238 <p><a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·copies·the·tuple·it·modifies.·Therefore,
239 updating·a·tuple·in·a·loop·using·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·creates·a·new239 updating·a·tuple·in·a·loop·using·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·creates·a·new
240 copy·of·the·tuple·every·time.</p><p>There·is·one·exception·to·the·rule·that·the·tuple·is·copied.·If·the·compiler240 copy·of·the·tuple·every·time.</p><p>There·is·one·exception·to·the·rule·that·the·tuple·is·copied.·If·the·compiler
241 clearly·can·see·that·destructively·updating·the·tuple·would·give·the·same·result241 clearly·can·see·that·destructively·updating·the·tuple·would·give·the·same·result
242 as·if·the·tuple·was·copied,·the·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·is242 as·if·the·tuple·was·copied,·the·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·is
243 replaced·with·a·special·destructive·<code·class="inline">setelement</code>·instruction.·In·the·following243 replaced·with·a·special·destructive·<code·class="inline">setelement</code>·instruction.·In·the·following
244 code·sequence,·the·first·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·call·copies·the·tuple244 code·sequence,·the·first·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·call·copies·the·tuple
245 and·modifies·the·ninth·element:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">multiple_setelement</span><span·class="p"·data-group-id="6819110488-1">(</span><span·class="n">T0</span><span·class="p"·data-group-id="6819110488-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="6819110488-2">(<[·...·truncated·by·diffoscope;·len:·70,·SHA:·336fb2504db0bd7f5b0a5463ff5b3bc830b3ca4451e8f8071f93a77cf7c0f4b5·...·]88-2">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="mi">9</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">245 and·modifies·the·ninth·element:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">multiple_setelement</span><span·class="p"·data-group-id="0154698888-1">(</span><span·class="n">T0</span><span·class="p"·data-group-id="0154698888-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="0154698888-2">(<[·...·truncated·by·diffoscope;·len:·70,·SHA:·1be60bbbb327632552676ea85b2f76627751259c37379360b8d96af03502b70e·...·]88-2">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="mi">9</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
246 ····</span><span·class="n">T1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">setelement</span><span·class="p"·data-group-id="6819110488-3">(</span><span·class="mi">9</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p"·data-group-id="6819110488-3">)</span><span·class="p">,</span><span·class="w">246 ····</span><span·class="n">T1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">setelement</span><span·class="p"·data-group-id="0154698888-3">(</span><span·class="mi">9</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p"·data-group-id="0154698888-3">)</span><span·class="p">,</span><span·class="w">
247 ····</span><span·class="n">T2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">setelement</span><span·class="p"·data-group-id="6819110488-4">(</span><span·class="mi">7</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foobar</span><span·class="p"·data-group-id="6819110488-4">)</span><span·class="p">,</span><span·class="w">247 ····</span><span·class="n">T2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">setelement</span><span·class="p"·data-group-id="0154698888-4">(</span><span·class="mi">7</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foobar</span><span·class="p"·data-group-id="0154698888-4">)</span><span·class="p">,</span><span·class="w">
248 ····</span><span·class="nf">setelement</span><span·class="p"·data-group-id="6819110488-5">(</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new_value</span><span·class="p"·data-group-id="6819110488-5">)</span><span·class="p">.</span></code></pre><p>The·two·following·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·calls·modify·the·tuple·in248 ····</span><span·class="nf">setelement</span><span·class="p"·data-group-id="0154698888-5">(</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new_value</span><span·class="p"·data-group-id="0154698888-5">)</span><span·class="p">.</span></code></pre><p>The·two·following·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·calls·modify·the·tuple·in
249 place.</p><p>For·the·optimization·to·be·applied,·<em>all</em>·the·following·conditions·must·be·true:</p><ul><li>The·tuple·argument·must·be·known·to·be·a·tuple·of·a·known·size.</li><li>The·indices·must·be·integer·literals,·not·variables·or·expressions.</li><li>The·indices·must·be·given·in·descending·order.</li><li>There·must·be·no·calls·to·another·function·in·between·the·calls·to249 place.</p><p>For·the·optimization·to·be·applied,·<em>all</em>·the·following·conditions·must·be·true:</p><ul><li>The·tuple·argument·must·be·known·to·be·a·tuple·of·a·known·size.</li><li>The·indices·must·be·integer·literals,·not·variables·or·expressions.</li><li>The·indices·must·be·given·in·descending·order.</li><li>There·must·be·no·calls·to·another·function·in·between·the·calls·to
250 <a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>.</li><li>The·tuple·returned·from·one·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·call·must·only·be250 <a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>.</li><li>The·tuple·returned·from·one·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>·call·must·only·be
251 used·in·the·subsequent·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>.</li></ul><p>If·the·code·cannot·be·structured·as·in·the·<code·class="inline">multiple_setelement/1</code>·example,·the251 used·in·the·subsequent·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#setelement/3"><code·class="inline">setelement/3</code></a>.</li></ul><p>If·the·code·cannot·be·structured·as·in·the·<code·class="inline">multiple_setelement/1</code>·example,·the
252 best·way·to·modify·multiple·elements·in·a·large·tuple·is·to·convert·the·tuple·to252 best·way·to·modify·multiple·elements·in·a·large·tuple·is·to·convert·the·tuple·to
253 a·list,·modify·the·list,·and·convert·it·back·to·a·tuple.</p><h2·id="size-1"·class="section-heading">253 a·list,·modify·the·list,·and·convert·it·back·to·a·tuple.</p><h2·id="size-1"·class="section-heading">
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138 ··<span·class="text">Creating·a·Target·System</span>138 ··<span·class="text">Creating·a·Target·System</span>
139 </h2>139 </h2>
140 <p>It·is·assumed·that·you·have·a·working·Erlang/OTP·system·structured·according·to140 <p>It·is·assumed·that·you·have·a·working·Erlang/OTP·system·structured·according·to
141 the·OTP·design·principles.</p><p><em>Step·1.</em>·Create·a·<code·class="inline">.rel</code>·file·(see·the·<a·href="../../lib/sasl-4.2.2/doc/html/rel.html">rel(4)</a>·manual·page·in141 the·OTP·design·principles.</p><p><em>Step·1.</em>·Create·a·<code·class="inline">.rel</code>·file·(see·the·<a·href="../../lib/sasl-4.2.2/doc/html/rel.html">rel(4)</a>·manual·page·in
142 SASL),·which·specifies·the·ERTS·version·and·lists·all·applications·that·are·to142 SASL),·which·specifies·the·ERTS·version·and·lists·all·applications·that·are·to
143 be·included·in·the·new·basic·target·system.·An·example·is·the·following143 be·included·in·the·new·basic·target·system.·An·example·is·the·following
144 <code·class="inline">mysystem.rel</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·mysystem.rel</span><span·class="w">144 <code·class="inline">mysystem.rel</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·mysystem.rel</span><span·class="w">
145 </span><span·class="p"·data-group-id="0021434030-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">145 </span><span·class="p"·data-group-id="3782959228-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">
146 ·</span><span·class="p"·data-group-id="0021434030-2">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;FIRST&quot;</span><span·class="p"·data-group-id="0021434030-2">}</span><span·class="p">,</span><span·class="w">146 ·</span><span·class="p"·data-group-id="3782959228-2">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;FIRST&quot;</span><span·class="p"·data-group-id="3782959228-2">}</span><span·class="p">,</span><span·class="w">
147 ·</span><span·class="p"·data-group-id="0021434030-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.10.4&quot;</span><span·class="p"·data-group-id="0021434030-3">}</span><span·class="p">,</span><span·class="w">147 ·</span><span·class="p"·data-group-id="3782959228-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.10.4&quot;</span><span·class="p"·data-group-id="3782959228-3">}</span><span·class="p">,</span><span·class="w">
148 ·</span><span·class="p"·data-group-id="0021434030-4">[</span><span·class="p"·data-group-id="0021434030-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.16.4&quot;</span><span·class="p"·data-group-id="0021434030-5">}</span><span·class="p">,</span><span·class="w">148 ·</span><span·class="p"·data-group-id="3782959228-4">[</span><span·class="p"·data-group-id="3782959228-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.16.4&quot;</span><span·class="p"·data-group-id="3782959228-5">}</span><span·class="p">,</span><span·class="w">
149 ··</span><span·class="p"·data-group-id="0021434030-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1.19.4&quot;</span><span·class="p"·data-group-id="0021434030-6">}</span><span·class="p">,</span><span·class="w">149 ··</span><span·class="p"·data-group-id="3782959228-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1.19.4&quot;</span><span·class="p"·data-group-id="3782959228-6">}</span><span·class="p">,</span><span·class="w">
150 ··</span><span·class="p"·data-group-id="0021434030-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.3.4&quot;</span><span·class="p"·data-group-id="0021434030-7">}</span><span·class="p">,</span><span·class="w">150 ··</span><span·class="p"·data-group-id="3782959228-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.3.4&quot;</span><span·class="p"·data-group-id="3782959228-7">}</span><span·class="p">,</span><span·class="w">
151 ··</span><span·class="p"·data-group-id="0021434030-8">{</span><span·class="ss">pea</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p"·data-group-id="0021434030-8">}</span><span·class="p"·data-group-id="0021434030-4">]</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·689dfe6f3f05edfd648d4d5289546645b58b8311ffec07af61302f5f7e7107c9·...·]-1">}</span><span·class="p">.</span></code></pre><p>The·listed·applications·are·not·only·original·Erlang/OTP·applications·but151 ··</span><span·class="p"·data-group-id="3782959228-8">{</span><span·class="ss">pea</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p"·data-group-id="3782959228-8">}</span><span·class="p"·data-group-id="3782959228-4">]</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·2450a77b965e54df9f9041b0322914bda6119863f257e3e9426afc73a44e552c·...·]-1">}</span><span·class="p">.</span></code></pre><p>The·listed·applications·are·not·only·original·Erlang/OTP·applications·but
152 possibly·also·new·applications·that·you·have·written·(here·exemplified·by·the152 possibly·also·new·applications·that·you·have·written·(here·exemplified·by·the
153 application·Pea·(<code·class="inline">pea</code>)).</p><p><em>Step·2.</em>·Start·Erlang/OTP·from·the·directory·where·the·<code·class="inline">mysystem.rel</code>·file153 application·Pea·(<code·class="inline">pea</code>)).</p><p><em>Step·2.</em>·Start·Erlang/OTP·from·the·directory·where·the·<code·class="inline">mysystem.rel</code>·file
154 resides:</p><pre><code·class="text">%·erl·-pa·/home/user/target_system/myapps/pea-1.0/ebin</code></pre><p>The·<code·class="inline">-pa</code>·argument·prepends·the·path·to·the·<code·class="inline">ebin</code>·directory·for154 resides:</p><pre><code·class="text">%·erl·-pa·/home/user/target_system/myapps/pea-1.0/ebin</code></pre><p>The·<code·class="inline">-pa</code>·argument·prepends·the·path·to·the·<code·class="inline">ebin</code>·directory·for
155 the·Pea·application·to·the·code·path.</p><p><em>Step·3.</em>·Create·the·target·system:</p><pre><code·class="text">1&gt;·target_system:create(&quot;mysystem&quot;).</code></pre><p>The·function·<code·class="inline">target_system:create/1</code>·performs·the·following:</p><ol><li><p>Reads·the·file·<code·class="inline">mysystem.rel</code>·and·creates·a·new·file·<code·class="inline">plain.rel</code>.155 the·Pea·application·to·the·code·path.</p><p><em>Step·3.</em>·Create·the·target·system:</p><pre><code·class="text">1&gt;·target_system:create(&quot;mysystem&quot;).</code></pre><p>The·function·<code·class="inline">target_system:create/1</code>·performs·the·following:</p><ol><li><p>Reads·the·file·<code·class="inline">mysystem.rel</code>·and·creates·a·new·file·<code·class="inline">plain.rel</code>.
156 The·new·file·is·identical·to·the·original,·except·that·it·only156 The·new·file·is·identical·to·the·original,·except·that·it·only
157 lists·the·Kernel·and·STDLIB·applications.</p></li><li><p>From·the·files·<code·class="inline">mysystem.rel</code>·and·<code·class="inline">plain.rel</code>·creates·the·files157 lists·the·Kernel·and·STDLIB·applications.</p></li><li><p>From·the·files·<code·class="inline">mysystem.rel</code>·and·<code·class="inline">plain.rel</code>·creates·the·files
158 <code·class="inline">mysystem.script</code>,·<code·class="inline">mysystem.boot</code>,·<code·class="inline">plain.script</code>,·and·<code·class="inline">plain.boot</code>158 <code·class="inline">mysystem.script</code>,·<code·class="inline">mysystem.boot</code>,·<code·class="inline">plain.script</code>,·and·<code·class="inline">plain.boot</code>
Offset 242, 25 lines modifiedOffset 242, 25 lines modified
242 ··<a·href="#creating-the-next-version"·class="hover-link">242 ··<a·href="#creating-the-next-version"·class="hover-link">
243 ····<i·class="ri-link-m"·aria-hidden="true"></i>243 ····<i·class="ri-link-m"·aria-hidden="true"></i>
244 ··</a>244 ··</a>
245 ··<span·class="text">Creating·the·Next·Version</span>245 ··<span·class="text">Creating·the·Next·Version</span>
246 </h2>246 </h2>
247 <p>In·this·example·the·Pea·application·has·been·changed,·and·so·are·the247 <p>In·this·example·the·Pea·application·has·been·changed,·and·so·are·the
248 applications·ERTS,·Kernel,·STDLIB·and·SASL.</p><p><em>Step·1.</em>·Create·the·file·<code·class="inline">.rel</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·mysystem2.rel</span><span·class="w">248 applications·ERTS,·Kernel,·STDLIB·and·SASL.</p><p><em>Step·1.</em>·Create·the·file·<code·class="inline">.rel</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·mysystem2.rel</span><span·class="w">
249 </span><span·class="p"·data-group-id="6168833681-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">249 </span><span·class="p"·data-group-id="2329310776-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">
250 ·</span><span·class="p"·data-group-id="6168833681-2">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SECOND&quot;</span><span·class="p"·data-group-id="6168833681-2">}</span><span·class="p">,</span><span·class="w">250 ·</span><span·class="p"·data-group-id="2329310776-2">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SECOND&quot;</span><span·class="p"·data-group-id="2329310776-2">}</span><span·class="p">,</span><span·class="w">
251 ·</span><span·class="p"·data-group-id="6168833681-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;6.0&quot;</span><span·class="p"·data-group-id="6168833681-3">}</span><span·class="p">,</span><span·class="w">251 ·</span><span·class="p"·data-group-id="2329310776-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;6.0&quot;</span><span·class="p"·data-group-id="2329310776-3">}</span><span·class="p">,</span><span·class="w">
252 ·</span><span·class="p"·data-group-id="6168833681-4">[</span><span·class="p"·data-group-id="6168833681-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;3.0&quot;</span><span·class="p"·data-group-id="6168833681-5">}</span><span·class="p">,</span><span·class="w">252 ·</span><span·class="p"·data-group-id="2329310776-4">[</span><span·class="p"·data-group-id="2329310776-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;3.0&quot;</span><span·class="p"·data-group-id="2329310776-5">}</span><span·class="p">,</span><span·class="w">
253 ··</span><span·class="p"·data-group-id="6168833681-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.0&quot;</span><span·class="p"·data-group-id="6168833681-6">}</span><span·class="p">,</span><span·class="w">253 ··</span><span·class="p"·data-group-id="2329310776-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.0&quot;</span><span·class="p"·data-group-id="2329310776-6">}</span><span·class="p">,</span><span·class="w">
254 ··</span><span·class="p"·data-group-id="6168833681-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.4&quot;</span><span·class="p"·data-group-id="6168833681-7">}</span><span·class="p">,</span><span·class="w">254 ··</span><span·class="p"·data-group-id="2329310776-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.4&quot;</span><span·class="p"·data-group-id="2329310776-7">}</span><span·class="p">,</span><span·class="w">
255 ··</span><span·class="p"·data-group-id="6168833681-8">{</span><span·class="ss">pea</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.0&quot;</span><span·class="p"·data-group-id="6168833681-8">}</span><span·class="p"·data-group-id="6168833681-4">]</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·211a4d8f90a923da049f6a40d702ace097e93ced83a4c08d1eb55295875a27ce·...·]-1">}</span><span·class="p">.</span></code></pre><p><em>Step·2.</em>·Create·the·application·upgrade·file·(see255 ··</span><span·class="p"·data-group-id="2329310776-8">{</span><span·class="ss">pea</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.0&quot;</span><span·class="p"·data-group-id="2329310776-8">}</span><span·class="p"·data-group-id="2329310776-4">]</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·004eeb126a128e0311f09b2e3a2dfb83087b70dda6398abf619e7039d9cb8a63·...·]-1">}</span><span·class="p">.</span></code></pre><p><em>Step·2.</em>·Create·the·application·upgrade·file·(see
256 <a·href="../../lib/sasl-4.2.2/doc/html/appup.html">appup</a>·in·SASL)·for·Pea,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·pea.appup</span><span·class="w">256 <a·href="../../lib/sasl-4.2.2/doc/html/appup.html">appup</a>·in·SASL)·for·Pea,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·pea.appup</span><span·class="w">
257 </span><span·class="p"·data-group-id="1389606178-1">{</span><span·class="s">&quot;2.0&quot;</span><span·class="p">,</span><span·class="w">257 </span><span·class="p"·data-group-id="7075521480-1">{</span><span·class="s">&quot;2.0&quot;</span><span·class="p">,</span><span·class="w">
258 ·</span><span·class="p"·data-group-id="1389606178-2">[</span><span·class="p"·data-group-id="1389606178-3">{</span><span·class="s">&quot;1.0&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1389606178-4">[</span><span·class="p"·data-group-id="1389606178-5">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="ss">pea_lib</span><span·class="p"·data-group-id="1389606178-5">}</span><span·class="p"·data-group-id="1389606178-4">]</span><span·class="p"·data-group-id="1389606178-3">}</span><span·class="p"·data-group-id="1389606178-2">]</span><span·class="p">,</span><span·class="w"> 
259 ·</span><span·class="p"·data-group-id="1389606178-6">[</span><span·class="p"·data-group-id="1389606178-7">{</span><span·class="s">&quot;1.0&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1389606178-8">[</span><span·class="p"·data-group-id="1389606178-9">{</span><span·class="[·...·truncated·by·diffoscope;·len:·493,·SHA:·9a02595393f6d0d2a65c519d04899c0bcc1147bb740b5fcd43a966157f7738aa·...·]258 ·</span><span·class="p"·data-group-id="7075521480-2">[</span><span·class="p"·data-group-id="7075521480-3">{</span><span·class="s">&quot;1.0&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="7075521480-4">[</span><span·class="p"·data-group-id="7075521480-5">{</span><span·class="[·...·truncated·by·diffoscope;·len:·329,·SHA:·913c0838fce5ec2cf9ed9e063afde52ceb8e4b1b62c0eb9fcbd239f50099546a·...·]
 259 ·</span><span·class="p"·data-group-id="7075521480-6">[</span><span·class="p"·data-group-id="7075521480-7">{</span><span·class="s">&quot;1.0&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="7075521480-8">[</span><span·class="p"·data-group-id="7075521480-9">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="ss">pea_lib</span><span·class="p"·data-group-id="7075521480-9">}</span><span·class="p"·data-group-id="7075521480-8">]</span><span·class="p"·data-group-id="7075521480-7">}</span><span·class="p"·data-group-id="7075521480-6">]</span><span·class="p"·data-group-id="7075521480-1">}</span><span·class="p">.</span></code></pre><p><em>Step·3.</em>·From·the·directory·where·the·file·<code·class="inline">mysystem2.rel</code>·resides,·start·the
260 Erlang/OTP·system,·giving·the·path·to·the·new·version·of·Pea:</p><pre><code·class="text">%·erl·-pa·/home/user/target_system/myapps/pea-2.0/ebin</code></pre><p><em>Step·4.</em>·Create·the·release·upgrade·file·(see·<a·href="../../lib/sasl-4.2.2/doc/html/relup.html">relup</a>260 Erlang/OTP·system,·giving·the·path·to·the·new·version·of·Pea:</p><pre><code·class="text">%·erl·-pa·/home/user/target_system/myapps/pea-2.0/ebin</code></pre><p><em>Step·4.</em>·Create·the·release·upgrade·file·(see·<a·href="../../lib/sasl-4.2.2/doc/html/relup.html">relup</a>
261 in·SASL):</p><pre><code·class="text">1&gt;·systools:make_relup(&quot;mysystem2&quot;,[&quot;mysystem&quot;],[&quot;mysystem&quot;],261 in·SASL):</p><pre><code·class="text">1&gt;·systools:make_relup(&quot;mysystem2&quot;,[&quot;mysystem&quot;],[&quot;mysystem&quot;],
262 ····[{path,[&quot;/home/user/target_system/myapps/pea-1.0/ebin&quot;,262 ····[{path,[&quot;/home/user/target_system/myapps/pea-1.0/ebin&quot;,
263 ····&quot;/my/old/erlang/lib/*/ebin&quot;]}]).</code></pre><p>Here·<code·class="inline">&quot;mysystem&quot;</code>·is·the·base·release·and·<code·class="inline">&quot;mysystem2&quot;</code>·is·the·release·to263 ····&quot;/my/old/erlang/lib/*/ebin&quot;]}]).</code></pre><p>Here·<code·class="inline">&quot;mysystem&quot;</code>·is·the·base·release·and·<code·class="inline">&quot;mysystem2&quot;</code>·is·the·release·to
264 upgrade·to.</p><p>The·<code·class="inline">path</code>·option·is·used·for·pointing·out·the·old·version·of·all·applications.264 upgrade·to.</p><p>The·<code·class="inline">path</code>·option·is·used·for·pointing·out·the·old·version·of·all·applications.
265 (The·new·versions·are·already·in·the·code·path·-·assuming·of·course·that·the265 (The·new·versions·are·already·in·the·code·path·-·assuming·of·course·that·the
266 Erlang·node·on·which·this·is·executed·is·running·the·correct·version·of266 Erlang·node·on·which·this·is·executed·is·running·the·correct·version·of
Offset 292, 21 lines modifiedOffset 292, 21 lines modified
292 {continue_after_restart,&quot;FIRST&quot;,[]}292 {continue_after_restart,&quot;FIRST&quot;,[]}
293 heart:·Tue·Apr··1·12:15:10·2014:·Erlang·has·closed.293 heart:·Tue·Apr··1·12:15:10·2014:·Erlang·has·closed.
294 heart:·Tue·Apr··1·12:15:11·2014:·Executed·&quot;/usr/local/erl-target/bin/start·/usr/local/erl-target/releases/new_start_erl.data&quot;·-&gt;·0.·Terminating.294 heart:·Tue·Apr··1·12:15:11·2014:·Executed·&quot;/usr/local/erl-target/bin/start·/usr/local/erl-target/releases/new_start_erl.data&quot;·-&gt;·0.·Terminating.
295 [End]</code></pre><p>The·above·return·value·and·output·after·the·call·to295 [End]</code></pre><p>The·above·return·value·and·output·after·the·call·to
296 <a·href="../../lib/sasl-4.2.2/doc/html/release_handler.html#install_release/1"><code·class="inline">release_handler:install_release/1</code></a>·means·that·the·<code·class="inline">release_handler</code>·has296 <a·href="../../lib/sasl-4.2.2/doc/html/release_handler.html#install_release/1"><code·class="inline">release_handler:install_release/1</code></a>·means·that·the·<code·class="inline">release_handler</code>·has
297 restarted·the·node·by·using·<code·class="inline">heart</code>.·This·is·always·done·when·the·upgrade297 restarted·the·node·by·using·<code·class="inline">heart</code>.·This·is·always·done·when·the·upgrade
298 involves·a·change·of·the·applications·ERTS,·Kernel,·STDLIB,·or·SASL.·For·more298 involves·a·change·of·the·applications·ERTS,·Kernel,·STDLIB,·or·SASL.·For·more
299 information,·see·<a·href="upgrade.html">Upgrade·when·Erlang/OTP·has·Changed</a>.</p><p>The·node·is·accessible·through·a·new·pipe:</p><pre><code·class="text">%·/usr/local/erl-target/bin/to_erl·/tmp/erlang.pipe.2</code></pre><p>List·the·available·releases·in·the·system:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">release_handler</span><span·class="p">:</span><span·class="nf">which_releases</span><span·class="p"·data-group-id="0686747050-1">(</span><span·class="p"·data-group-id="0686747050-1">)</span><span·class="p">.</span><span·class="w">299 information,·see·<a·href="upgrade.html">Upgrade·when·Erlang/OTP·has·Changed</a>.</p><p>The·node·is·accessible·through·a·new·pipe:</p><pre><code·class="text">%·/usr/local/erl-target/bin/to_erl·/tmp/erlang.pipe.2</code></pre><p>List·the·available·releases·in·the·system:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">release_handler</span><span·class="p">:</span><span·class="nf">which_releases</span><span·class="p"·data-group-id="1937301807-1">(</span><span·class="p"·data-group-id="1937301807-1">)</span><span·class="p">.</span><span·class="w">
300 </span><span·class="p"·data-group-id="0686747050-2">[</span><span·class="p"·data-group-id="0686747050-3">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="s">&quot;SECOND&quot;</span><span·class="p">,</span><span·class="w">300 </span><span·class="p"·data-group-id="1937301807-2">[</span><span·class="p"·data-group-id="1937301807-3">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="s">&quot;SECOND&quot;</span><span·class="p">,</span><span·class="w">
301 ··</span><span·class="p"·data-group-id="0686747050-4">[</span><span·class="s">&quot;kernel-3.0&quot;</span><span·class="p">,</span><span·class="s">&quot;stdlib-2.0&quot;</span><span·class="p">,</span><span·class="s">&quot;sasl-2.4&quot;</span><span·class="p">,</span><span·class="s">&quot;pea-2.0[·...·truncated·by·diffoscope;·len:·54,·SHA:·5451f9af4da93959dde2ac1db328f13f534d7c67092f7c5fe0280b978629293c·...·]-4">]</span><span·class="p">,</span><span·class="w">301 ··</span><span·class="p"·data-group-id="1937301807-4">[</span><span·class="s">&quot;kernel-3.0&quot;</span><span·class="p">,</span><span·class="s">&quot;stdlib-2.0&quot;</span><span·class="p">,</span><span·class="s">&quot;sasl-2.4&quot;</span><span·class="p">,</span><span·class="s">&quot;pea-2.0[·...·truncated·by·diffoscope;·len:·54,·SHA:·7de763cda2cf4daf8d0cd053853266622c97284df013d08d1212a86f1493657d·...·]-4">]</span><span·class="p">,</span><span·class="w">
302 ··</span><span·class="ss">current</span><span·class="p"·data-group-id="0686747050-3">}</span><span·class="p">,</span><span·class="w">302 ··</span><span·class="ss">current</span><span·class="p"·data-group-id="1937301807-3">}</span><span·class="p">,</span><span·class="w">
303 ·</span><span·class="p"·data-group-id="0686747050-5">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRST&quot;</span><span·class="p">,</span><span·class="w">303 ·</span><span·class="p"·data-group-id="1937301807-5">{</span><span·class="s">&quot;MYSYSTEM&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRST&quot;</span><span·class="p">,</span><span·class="w">
304 ··</span><span·class="p"·data-group-id="0686747050-6">[</span><span·class="s">&quot;kernel-2.16.4&quot;</span><span·class="p">,</span><span·class="s">&quot;stdlib-1.19.4&quot;</span><span·class="p">,</span><span·class="s">&quot;sasl-2.3.4&quot;</span><span·class="p">,</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·62,·SHA:·52f0fab6cf3e0239b413f3ac19311f4b17a56d2267288eeca6c1a2ad6a7f7d3c·...·]-6">]</span><span·class="p">,</span><span·class="w">304 ··</span><span·class="p"·data-group-id="1937301807-6">[</span><span·class="s">&quot;kernel-2.16.4&quot;</span><span·class="p">,</span><span·class="s">&quot;stdlib-1.19.4&quot;</span><span·class="p">,</span><span·class="s">&quot;sasl-2.3.4&quot;</span><span·class="p">,</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·62,·SHA:·af6d9af58298aff8513b8f96c03af26dec47be34412614c9ed53e101fcc5dc93·...·]-6">]</span><span·class="p">,</span><span·class="w">
305 ··</span><span·class="ss">permanent</span><span·class="p"·data-group-id="0686747050-5">}</span><span·class="p"·data-group-id="0686747050-2">]</span></code></pre><p>Our·new·release,·&quot;SECOND&quot;,·is·now·the·current·release,·but·we·can·also·see·that305 ··</span><span·class="ss">permanent</span><span·class="p"·data-group-id="1937301807-5">}</span><span·class="p"·data-group-id="1937301807-2">]</span></code></pre><p>Our·new·release,·&quot;SECOND&quot;,·is·now·the·current·release,·but·we·can·also·see·that
306 our·&quot;FIRST&quot;·release·is·still·permanent.·This·means·that·if·the·node·would·be306 our·&quot;FIRST&quot;·release·is·still·permanent.·This·means·that·if·the·node·would·be
307 restarted·now,·it·would·come·up·running·the·&quot;FIRST&quot;·release·again.</p><p><em>Step·3.</em>·Make·the·new·release·permanent:</p><pre><code·class="text">2&gt;·release_handler:make_permanent(&quot;SECOND&quot;).</code></pre><p>Check·the·releases·again:</p><pre><code·class="c">3&gt;·release_handler:which_releases().307 restarted·now,·it·would·come·up·running·the·&quot;FIRST&quot;·release·again.</p><p><em>Step·3.</em>·Make·the·new·release·permanent:</p><pre><code·class="text">2&gt;·release_handler:make_permanent(&quot;SECOND&quot;).</code></pre><p>Check·the·releases·again:</p><pre><code·class="c">3&gt;·release_handler:which_releases().
308 [{&quot;MYSYSTEM&quot;,&quot;SECOND&quot;,308 [{&quot;MYSYSTEM&quot;,&quot;SECOND&quot;,
309 ··[&quot;kernel-3.0&quot;,&quot;stdlib-2.0&quot;,&quot;sasl-2.4&quot;,&quot;pea-2.0&quot;],309 ··[&quot;kernel-3.0&quot;,&quot;stdlib-2.0&quot;,&quot;sasl-2.4&quot;,&quot;pea-2.0&quot;],
310 ··permanent},310 ··permanent},
311 ·{&quot;MYSYSTEM&quot;,&quot;FIRST&quot;,311 ·{&quot;MYSYSTEM&quot;,&quot;FIRST&quot;,
312 ··[&quot;kernel-2.16.4&quot;,&quot;stdlib-1.19.4&quot;,&quot;sasl-2.3.4&quot;,&quot;pea-1.0&quot;],312 ··[&quot;kernel-2.16.4&quot;,&quot;stdlib-1.19.4&quot;,&quot;sasl-2.3.4&quot;,&quot;pea-1.0&quot;],
Offset 315, 268 lines modifiedOffset 315, 268 lines modified
315 ··<a·href="#listing-of-target_system-erl"·class="hover-link">315 ··<a·href="#listing-of-target_system-erl"·class="hover-link">
316 ····<i·class="ri-link-m"·aria-hidden="true"></i>316 ····<i·class="ri-link-m"·aria-hidden="true"></i>
317 ··</a>317 ··</a>
318 ··<span·class="text">Listing·of·target_system.erl</span>318 ··<span·class="text">Listing·of·target_system.erl</span>
319 </h2>319 </h2>
320 <p>This·module·can·also·be·found·in·the·<code·class="inline">examples</code>·directory·of·the·SASL320 <p>This·module·can·also·be·found·in·the·<code·class="inline">examples</code>·directory·of·the·SASL
321 application.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">321 application.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
322 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3446027236-1">(</span><span·class="ss">target_system</span><span·class="p"·data-group-id="3446027236-1">)</span><span·class="p">.</span><span·class="w">322 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6811462522-1">(</span><span·class="ss">target_system</span><span·class="p"·data-group-id="6811462522-1">)</span><span·class="p">.</span><span·class="w">
323 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3446027236-2">(</span><span·class="p"·data-group-id="3446027236-3">[</span><span·class="ss">create</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">create</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·247,·SHA:·35d773148c723c5ffe8976508f72517c082e940985542389ea8d328dd8c0f2ea·...·]-2">)</span><span·class="p">.</span><span·class="w">323 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6811462522-2">(</span><span·class="p"·data-group-id="6811462522-3">[</span><span·class="ss">create</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">create</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·247,·SHA:·420cae8581f2a91d1ebf0b9e84b3fbb3fea189debf462cad19e2950ed80d7df1·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
324 </span><span·class="c1">%%·Note:·RelFileName·below·is·the·*stem*·without·trailing·.rel,</span><span·class="w">324 </span><span·class="c1">%%·Note:·RelFileName·below·is·the·*stem*·without·trailing·.rel,</span><span·class="w">
325 </span><span·class="c1">%%·.script·etc.</span><span·class="w">325 </span><span·class="c1">%%·.script·etc.</span><span·class="w">
326 </span><span·class="c1">%%</span><span·class="w">326 </span><span·class="c1">%%</span><span·class="w">
  
327 </span><span·class="c1">%%·create(RelFileName)</span><span·class="w">327 </span><span·class="c1">%%·create(RelFileName)</span><span·class="w">
328 </span><span·class="c1">%%</span><span·class="w">328 </span><span·class="c1">%%</span><span·class="w">
329 </span><span·class="nf">create</span><span·class="p"·data-group-id="3446027236-4">(</span><span·class="n">RelFileName</span><span·class="p"·data-group-id="3446027236-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">329 </span><span·class="nf">create</span><span·class="p"·data-group-id="6811462522-4">(</span><span·class="n">RelFileName</span><span·class="p"·data-group-id="6811462522-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
330 ····</span><span·class="nf">create</span><span·class="p"·data-group-id="3446027236-5">(</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="p"·data-group-id="3446027236-6">[</span><span·class="p"·data-group-id="3446027236-6">]</span><span·class="p"·data-group-id="3446027236-5">)</span><span·class="p">.</span><span·class="w">330 ····</span><span·class="nf">create</span><span·class="p"·data-group-id="6811462522-5">(</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="p"·data-group-id="6811462522-6">[</span><span·class="p"·data-group-id="6811462522-6">]</span><span·class="p"·data-group-id="6811462522-5">)</span><span·class="p">.</span><span·class="w">
  
331 </span><span·class="nf">create</span><span·class="p"·data-group-id="3446027236-7">(</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="n">SystoolsOpts</span><span·class="p"·data-group-id="3446027236-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">331 </span><span·class="nf">create</span><span·class="p"·data-group-id="6811462522-7">(</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="n">SystoolsOpts</span><span·class="p"·data-group-id="6811462522-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
332 ····</span><span·class="n">RelFile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RelFileName</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;.rel&quot;</span><span·class="p">,</span><span·class="w">332 ····</span><span·class="n">RelFile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RelFileName</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;.rel&quot;</span><span·class="p">,</span><span·class="w">
333 ····</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">dirname</span><span·class="p"·data-group-id="3446027236-8">(</span><span·class="n">RelFileName</span><span·class="p"·data-group-id="3446027236-8">)</span><span·class="p">,</span><span·class="w">333 ····</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">dirname</span><span·class="p"·data-group-id="6811462522-8">(</span><span·class="n">RelFileName</span><span·class="p"·data-group-id="6811462522-8">)</span><span·class="p">,</span><span·class="w">
334 ····</span><span·class="n">PlainRelFileName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="3446027236-9">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="s">&quot;plain&quot;</span><span·class="p"·data-group-id="3446027236-9">)</span><span·class="p">,</span><span·class="w">334 ····</span><span·class="n">PlainRelFileName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="6811462522-9">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="s">&quot;plain&quot;</span><span·class="p"·data-group-id="6811462522-9">)</span><span·class="p">,</span><span·class="w">
335 ····</span><span·class="n">PlainRelFile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">PlainRelFileName</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;.rel&quot;</span><span·class="p">,</span><span·class="w">335 ····</span><span·class="n">PlainRelFile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">PlainRelFileName</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;.rel&quot;</span><span·class="p">,</span><span·class="w">
336 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="3446027236-10">(</span><span·class="s">&quot;Reading·file:·~ts·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3446027236-11">[</span><span·class="n">RelFile</s[·...·truncated·by·diffoscope;·len:·99,·SHA:·89115fabb8c8b337109fb1a7d604cda2edef9d74bac826468432f90d6a974b5b·...·]-10">)</span><span·class="p">,</span><span·class="w">336 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="6811462522-10">(</span><span·class="s">&quot;Reading·file:·~ts·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6811462522-11">[</span><span·class="n">RelFile</s[·...·truncated·by·diffoscope;·len:·99,·SHA:·943a232ab5cf560378711291083001bf88cbb3df4523d203dbf5f333a17f4834·...·]-10">)</span><span·class="p">,</span><span·class="w">
337 ····</span><span·class="p"·data-group-id="3446027236-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3446027236-13">[</span><span·class="n">RelSpec</span><span·class="p"·data-group-id="3446027236-13">]</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·313,·SHA:·89f680c28a3f05d1529d61363e3806ddccd56c2653dee9949072422b9da1398b·...·]-14">)</span><span·class="p">,</span><span·class="w">337 ····</span><span·class="p"·data-group-id="6811462522-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6811462522-13">[</span><span·class="n">RelSpec</span><span·class="p"·data-group-id="6811462522-13">]</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·313,·SHA:·fc37fcf12c4f8215f4cde9fe0dffd5de8303d7acc2637c659363594ef2860bc2·...·]-14">)</span><span·class="p">,</span><span·class="w">
338 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="3446027236-15">(</span><span·class="s">&quot;Creating·file:·~ts·from·~ts·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">338 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="6811462522-15">(</span><span·class="s">&quot;Creating·file:·~ts·from·~ts·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
339 ··············</span><span·class="p"·data-group-id="3446027236-16">[</span><span·class="n">PlainRelFile</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelFile</span><span·class="p"·data-group-id="3446027236-16">]</span><span·class="p"·data-group-id="3446027236-15">)</span><span·class="p">,</span><span·class="w">339 ··············</span><span·class="p"·data-group-id="6811462522-16">[</span><span·class="n">PlainRelFile</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelFile</span><span·class="p"·data-group-id="6811462522-16">]</span><span·class="p"·data-group-id="6811462522-15">)</span><span·class="p">,</span><span·class="w">
340 ····</span><span·class="p"·data-group-id="3446027236-17">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">340 ····</span><span·class="p"·data-group-id="6811462522-17">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">
341 ·····</span><span·class="p"·data-group-id="3446027236-18">{</span><span·class="n">RelName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelVsn</span><span·class="p"·data-group-id="3446027236-18">}</span><span·class="p">,</span><span·class="w">341 ·····</span><span·class="p"·data-group-id="6811462522-18">{</span><span·class="n">RelName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelVsn</span><span·class="p"·data-group-id="6811462522-18">}</span><span·class="p">,</span><span·class="w">
342 ·····</span><span·class="p"·data-group-id="3446027236-19">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErtsVsn</span><span·class="p"·data-group-id="3446027236-19">}</span><span·class="p">,</span><span·class="w">342 ·····</span><span·class="p"·data-group-id="6811462522-19">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErtsVsn</span><span·class="p"·data-group-id="6811462522-19">}</span><span·class="p">,</span><span·class="w">
343 ·····</span><span·class="n">AppVsns</span><span·class="p"·data-group-id="3446027236-17">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RelSpec</span><span·class="p">,</span><span·class="w">343 ·····</span><span·class="n">AppVsns</span><span·class="p"·data-group-id="6811462522-17">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RelSpec</span><span·class="p">,</span><span·class="w">
344 ····</span><span·class="n">PlainRelSpec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3446027236-20">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">344 ····</span><span·class="n">PlainRelSpec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6811462522-20">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">
345 ····················</span><span·class="p"·data-group-id="3446027236-21">{</span><span·class="n">RelName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelVsn</span><span·class="p"·data-group-id="3446027236-21">}</span><span·class="p">,</span><span·class="w">345 ····················</span><span·class="p"·data-group-id="6811462522-21">{</span><span·class="n">RelName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelVsn</span><span·class="p"·data-group-id="6811462522-21">}</span><span·class="p">,</span><span·class="w">
346 ····················</span><span·class="p"·data-group-id="3446027236-22">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErtsVsn</span><span·class="p"·data-group-id="3446027236-22">}</span><span·class="p">,</span><span·class="w">346 ····················</span><span·class="p"·data-group-id="6811462522-22">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErtsVsn</span><span·class="p"·data-group-id="6811462522-22">}</span><span·class="p">,</span><span·class="w">
347 ····················</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">filter</span><span·class="p"·data-group-id="3446027236-23">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3446027236-24">(</span><span·class="p"·data-group-id="3446027236-25">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</s[·...·truncated·by·diffoscope;·len:·99,·SHA:·8edbd93c886138b05b20cf4e592a2b684ea969541189761c99d480ffd601a0d6·...·]-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">347 ····················</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">filter</span><span·class="p"·data-group-id="6811462522-23">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="6811462522-24">(</span><span·class="p"·data-group-id="6811462522-25">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</s[·...·truncated·by·diffoscope;·len:·99,·SHA:·0ae8e67231f82702dbd9de57725cb51c0890bae0622bc828b61fdb601459e936·...·]-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
348 ·········································</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">348 ·········································</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
349 ····································</span><span·class="p"·data-group-id="3446027236-26">(</span><span·class="p"·data-group-id="3446027236-27">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="3446027236-27">}</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·94642308596dcb8675038ef2bd09ff3b074c118c072268bf0606f18b60908261·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">349 ····································</span><span·class="p"·data-group-id="6811462522-26">(</span><span·class="p"·data-group-id="6811462522-27">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="6811462522-27">}</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·8f3524a61932e8e2ccdf53bfdded3d4b8833d042099f93fc7aa47b94555e02b6·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
350 ·········································</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">350 ·········································</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
351 ····································</span><span·class="p"·data-group-id="3446027236-28">(</span><span·class="p">_</span><span·class="p"·data-group-id="3446027236-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">351 ····································</span><span·class="p"·data-group-id="6811462522-28">(</span><span·class="p">_</span><span·class="p"·data-group-id="6811462522-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
352 ·········································</span><span·class="ss">false</span><span·class="w">352 ·········································</span><span·class="ss">false</span><span·class="w">
353 ·································</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsns</span><span·class="p"·data-group-id="3446027236-23">)</span><span·class="w">353 ·································</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsns</span><span·class="p"·data-group-id="6811462522-23">)</span><span·class="w">
354 ···················</span><span·class="p"·data-group-id="3446027236-20">}</span><span·class="p">,</span><span·class="w">354 ···················</span><span·class="p"·data-group-id="6811462522-20">}</span><span·class="p">,</span><span·class="w">
355 ····</span><span·class="p"·data-group-id="3446027236-29">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="3446027236-29">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·387,·SHA:·cf13946b0a489d99bfbd91acbd6cba577b9c56b96cf423f283d83386cee47cd7·...·]-30">)</span><span·class="p">,</span><span·class="w">355 ····</span><span·class="p"·data-group-id="6811462522-29">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="6811462522-29">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·387,·SHA:·61e3b31f4c24aeefb60eda552bc267b8cdb644db391206e05d7e12cf10abe6ce·...·]-30">)</span><span·class="p">,</span><span·class="w">
356 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="3446027236-32">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">.</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·206,·SHA:·c6c6bf14f530789469375511901bcc8990625ec3aa90395442e327d76ede6c5c·...·]-32">)</span><span·class="p">,</span><span·class="w">356 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="6811462522-32">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">.</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·206,·SHA:·fc76a68f1ea34f3d8627dc2de8135bd939d753d798eacae1e437545a30260f73·...·]-32">)</span><span·class="p">,</span><span·class="w">
357 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3446027236-34">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="3446027236-34">)</span><span·class="p">,</span><span·class="w">357 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="6811462522-34">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="6811462522-34">)</span><span·class="p">,</span><span·class="w">
  
358 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="3446027236-35">(</span><span·class="s">&quot;Making·\&quot;~ts.script\&quot;·and·\&quot;~ts.boot\&quot;·files·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">358 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="6811462522-35">(</span><span·class="s">&quot;Making·\&quot;~ts.script\&quot;·and·\&quot;~ts.boot\&quot;·files·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
359 »       ······</span><span·class="p"·data-group-id="3446027236-36">[</span><span·class="n">PlainRelFileName</span><span·class="p">,</span><span·class="n">PlainRelFileName</span><span·class="p"·data-group-id="3446027236-36">]</span><span·class="p"·data-group-id="3446027236-35">)</span><span·class="p">,</span><span·class="w">359 »       ······</span><span·class="p"·data-group-id="6811462522-36">[</span><span·class="n">PlainRelFileName</span><span·class="p">,</span><span·class="n">PlainRelFileName</span><span·class="p"·data-group-id="6811462522-36">]</span><span·class="p"·data-group-id="6811462522-35">)</span><span·class="p">,</span><span·class="w">
360 ····</span><span·class="nf">make_script</span><span·class="p"·data-group-id="3446027236-37">(</span><span·class="n">PlainRelFileName</span><span·class="p">,</span><span·class="n">SystoolsOpts</span><span·class="p"·data-group-id="3446027236-37">)</span><span·class="p">,</span><span·class="w">360 ····</span><span·class="nf">make_script</span><span·class="p"·data-group-id="6811462522-37">(</span><span·class="n">PlainRelFileName</span><span·class="p">,</span><span·class="n">SystoolsOpts</span><span·class="p"·data-group-id="6811462522-37">)</span><span·class="p">,</span><span·class="w">
  
361 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="3446027236-38">(</span><span·class="s">&quot;Making·\&quot;~ts.script\&quot;·and·\&quot;~ts.boot\&quot;·files·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">361 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="6811462522-38">(</span><span·class="s">&quot;Making·\&quot;~ts.script\&quot;·and·\&quot;~ts.boot\&quot;·files·...</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
362 ··············</span><span·class="p"·data-group-id="3446027236-39">[</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelFileName</span><span·class="p"·data-group-id="3446027236-39">]</span><span·class="p"·data-group-id="3446027236-38">)</span><span·class="p">,</span><span·class="w">362 ··············</span><span·class="p"·data-group-id="6811462522-39">[</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RelFileName</span><span·class="p"·data-group-id="6811462522-39">]</span><span·class="p"·data-group-id="6811462522-38">)</span><span·class="p">,</span><span·class="w">
363 ····</span><span·class="nf">make_script</span><span·class="p"·data-group-id="3446027236-40">(</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="n">SystoolsOpts</span><span·class="p"·data-group-id="3446027236-40">)</span><span·class="p">,</span><span·class="w">363 ····</span><span·class="nf">make_script</span><span·class="p"·data-group-id="6811462522-40">(</span><span·class="n">RelFileName</span><span·class="p">,</span><span·class="n">SystoolsOpts</span><span·class="p"·data-group-id="6811462522-40">)</span><span·class="p">,</span><span·class="w">
  
364 ····</span><span·class="n">TarFileName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RelFileName</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;.tar.gz&quot;</span><span·class="p">,</span><span·class="w">364 ····</span><span·class="n">TarFileName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RelFileName</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;.tar.gz&quot;</span><span·class="p">,</span><span·class="w">
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192 ··</a>192 ··</a>
193 ··<span·class="text">Representation·of·Floating·Point·Numbers</span>193 ··<span·class="text">Representation·of·Floating·Point·Numbers</span>
194 </h3>194 </h3>
195 <p>When·working·with·floats·you·may·not·see·what·you·expect·when·printing·or·doing195 <p>When·working·with·floats·you·may·not·see·what·you·expect·when·printing·or·doing
196 arithmetic·operations.·This·is·because·floats·are·represented·by·a·fixed·number196 arithmetic·operations.·This·is·because·floats·are·represented·by·a·fixed·number
197 of·bits·in·a·base-2·system·while·printed·floats·are·represented·with·a·base-10197 of·bits·in·a·base-2·system·while·printed·floats·are·represented·with·a·base-10
198 system.·Erlang·uses·64-bit·floats.·Here·are·examples·of·this·phenomenon:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="mf">0.1</span><span·class="o">+</span><span·class="mf">0.2</span><span·class="p">.</span><span·class="w">198 system.·Erlang·uses·64-bit·floats.·Here·are·examples·of·this·phenomenon:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="mf">0.1</span><span·class="o">+</span><span·class="mf">0.2</span><span·class="p">.</span><span·class="w">
199 </span><span·class="mf">0.30000000000000004</span></code></pre><p>The·real·numbers·<code·class="inline">0.1</code>·and·<code·class="inline">0.2</code>·cannot·be·represented·exactly·as·floats.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="6504554760-1">{</span><span·class="mf">36028797018963968.0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">36028797018963968</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mf">36028797018963968.0</span><span·class="p">,</span><span·class="w">199 </span><span·class="mf">0.30000000000000004</span></code></pre><p>The·real·numbers·<code·class="inline">0.1</code>·and·<code·class="inline">0.2</code>·cannot·be·represented·exactly·as·floats.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="4312463487-1">{</span><span·class="mf">36028797018963968.0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">36028797018963968</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mf">36028797018963968.0</span><span·class="p">,</span><span·class="w">
200 ··</span><span·class="mf">36028797018963970.0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">36028797018963970</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mf">36028797018963970.0</span><span·class="p"·data-group-id="6504554760-1">}</span><span·class="p">.</span><span·class="w">200 ··</span><span·class="mf">36028797018963970.0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">36028797018963970</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mf">36028797018963970.0</span><span·class="p"·data-group-id="4312463487-1">}</span><span·class="p">.</span><span·class="w">
201 </span><span·class="p"·data-group-id="6504554760-2">{</span><span·class="mf">3.602879701896397e16</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">201 </span><span·class="p"·data-group-id="4312463487-2">{</span><span·class="mf">3.602879701896397e16</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">
202 ·</span><span·class="mf">3.602879701896397e16</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6504554760-2">}</span><span·class="p">.</span></code></pre><p>The·value·<code·class="inline">36028797018963968</code>·can·be·represented·exactly·as·a·float·value·but202 ·</span><span·class="mf">3.602879701896397e16</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="4312463487-2">}</span><span·class="p">.</span></code></pre><p>The·value·<code·class="inline">36028797018963968</code>·can·be·represented·exactly·as·a·float·value·but
203 Erlang's·pretty·printer·rounds·<code·class="inline">36028797018963968.0</code>·to·<code·class="inline">3.602879701896397e16</code>203 Erlang's·pretty·printer·rounds·<code·class="inline">36028797018963968.0</code>·to·<code·class="inline">3.602879701896397e16</code>
204 (<code·class="inline">=36028797018963970.0</code>)·as·all·values·in·the·range204 (<code·class="inline">=36028797018963970.0</code>)·as·all·values·in·the·range
205 <code·class="inline">[36028797018963966.0,·36028797018963972.0]</code>·are·represented·by205 <code·class="inline">[36028797018963966.0,·36028797018963972.0]</code>·are·represented·by
206 <code·class="inline">36028797018963968.0</code>.</p><p>For·more·information·about·floats·and·issues·with·them·see:</p><ul><li><a·href="https://floating-point-gui.de/">What·Every·Programmer·Should·Know·About·Floating-Point·Arithmetic</a></li><li><a·href="https://0.30000000000000004.com/">0.30000000000000004.com/</a></li><li><a·href="https://docs.python.org/3/tutorial/floatingpoint.html">Floating·Point·Arithmetic:·Issues·and·Limitations</a></li></ul><p>If·you·need·to·work·with·exact·decimal·fractions,·for·instance·to·represent206 <code·class="inline">36028797018963968.0</code>.</p><p>For·more·information·about·floats·and·issues·with·them·see:</p><ul><li><a·href="https://floating-point-gui.de/">What·Every·Programmer·Should·Know·About·Floating-Point·Arithmetic</a></li><li><a·href="https://0.30000000000000004.com/">0.30000000000000004.com/</a></li><li><a·href="https://docs.python.org/3/tutorial/floatingpoint.html">Floating·Point·Arithmetic:·Issues·and·Limitations</a></li></ul><p>If·you·need·to·work·with·exact·decimal·fractions,·for·instance·to·represent
207 money,·it·is·recommended·to·use·a·library·that·handles·that,·or·work·in207 money,·it·is·recommended·to·use·a·library·that·handles·that,·or·work·in
208 cents·instead·of·dollars·or·euros·so·that·decimal·fractions·are·not·needed.</p><p>Also·note·that·Erlang's·floats·do·not·exactly·match·IEEE·754·floats,208 cents·instead·of·dollars·or·euros·so·that·decimal·fractions·are·not·needed.</p><p>Also·note·that·Erlang's·floats·do·not·exactly·match·IEEE·754·floats,
209 in·that·neither·<em>Inf</em>·nor·<em>NaN</em>·are·supported·in·Erlang.·Any209 in·that·neither·<em>Inf</em>·nor·<em>NaN</em>·are·supported·in·Erlang.·Any
Offset 237, 52 lines modifiedOffset 237, 52 lines modified
237 by·eight·are·called·<em>binaries</em>.</p><p><em>Examples:</em></p><pre><code·class="text">1&gt;·&lt;&lt;10,20&gt;&gt;.237 by·eight·are·called·<em>binaries</em>.</p><p><em>Examples:</em></p><pre><code·class="text">1&gt;·&lt;&lt;10,20&gt;&gt;.
238 &lt;&lt;10,20&gt;&gt;238 &lt;&lt;10,20&gt;&gt;
239 2&gt;·&lt;&lt;&quot;ABC&quot;&gt;&gt;.239 2&gt;·&lt;&lt;&quot;ABC&quot;&gt;&gt;.
240 &lt;&lt;&quot;ABC&quot;&gt;&gt;240 &lt;&lt;&quot;ABC&quot;&gt;&gt;
241 3&gt;·&lt;&lt;1:1,0:1&gt;&gt;.241 3&gt;·&lt;&lt;1:1,0:1&gt;&gt;.
242 &lt;&lt;2:2&gt;&gt;</code></pre><p>The·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_bitstring/1"><code·class="inline">is_bitstring/1</code></a>·BIF·tests·whether·a242 &lt;&lt;2:2&gt;&gt;</code></pre><p>The·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_bitstring/1"><code·class="inline">is_bitstring/1</code></a>·BIF·tests·whether·a
243 term·is·a·bit·string,·and·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_binary/1"><code·class="inline">is_binary/1</code></a>243 term·is·a·bit·string,·and·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_binary/1"><code·class="inline">is_binary/1</code></a>
244 BIF·tests·whether·a·term·is·a·binary.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">is_bitstring</span><span·class="p"·data-group-id="0305403612-1">(</span><span·class="p"·data-group-id="0305403612-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">1</span><span·class="p"·data-group-id="0305403612-2">&gt;&gt;</span><span·class="p"·data-group-id="030540361[·...·truncated·by·diffoscope;·len:·1,·SHA:·d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35·...·]-1">)</span><span·class="p">.</span><span·class="w">244 BIF·tests·whether·a·term·is·a·binary.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">is_bitstring</span><span·class="p"·data-group-id="7087848693-1">(</span><span·class="p"·data-group-id="7087848693-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">1</span><span·class="p"·data-group-id="7087848693-2">&gt;&gt;</span><span·class="p"·data-group-id="708784869[·...·truncated·by·diffoscope;·len:·1,·SHA:·4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce·...·]-1">)</span><span·class="p">.</span><span·class="w">
245 </span><span·class="ss">true</span><span·class="gp·unselectable">245 </span><span·class="ss">true</span><span·class="gp·unselectable">
246 2&gt;·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="0305403612-3">(</span><span·class="p"·data-group-id="0305403612-4">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">1</span><span·class="p"·data-group-id="0305403612-4">&gt;&gt;</span><span·class="p"·data-group-id="030540361[·...·truncated·by·diffoscope;·len:·1,·SHA:·d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35·...·]-3">)</span><span·class="p">.</span><span·class="w">246 2&gt;·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="7087848693-3">(</span><span·class="p"·data-group-id="7087848693-4">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">1</span><span·class="p"·data-group-id="7087848693-4">&gt;&gt;</span><span·class="p"·data-group-id="708784869[·...·truncated·by·diffoscope;·len:·1,·SHA:·4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce·...·]-3">)</span><span·class="p">.</span><span·class="w">
247 </span><span·class="ss">false</span><span·class="gp·unselectable">247 </span><span·class="ss">false</span><span·class="gp·unselectable">
248 3&gt;·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="0305403612-5">(</span><span·class="p"·data-group-id="0305403612-6">&lt;&lt;</span><span·class="mi">42</span><span·class="p"·data-group-id="0305403612-6">&gt;&gt;</span><span·class="p"·data-group-id="0305403612-5">)</span><span·class="p">.</span><span·class="w">248 3&gt;·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="7087848693-5">(</span><span·class="p"·data-group-id="7087848693-6">&lt;&lt;</span><span·class="mi">42</span><span·class="p"·data-group-id="7087848693-6">&gt;&gt;</span><span·class="p"·data-group-id="7087848693-5">)</span><span·class="p">.</span><span·class="w">
249 </span><span·class="ss">true</span><span·class="w">249 </span><span·class="ss">true</span><span·class="w">
250 </span></code></pre><p>For·more·examples,·see·<a·href="../../doc/system/bit_syntax.html">Programming·Examples</a>.</p><h2·id="reference"·class="section-heading">250 </span></code></pre><p>For·more·examples,·see·<a·href="../../doc/system/bit_syntax.html">Programming·Examples</a>.</p><h2·id="reference"·class="section-heading">
251 ··<a·href="#reference"·class="hover-link">251 ··<a·href="#reference"·class="hover-link">
252 ····<i·class="ri-link-m"·aria-hidden="true"></i>252 ····<i·class="ri-link-m"·aria-hidden="true"></i>
253 ··</a>253 ··</a>
254 ··<span·class="text">Reference</span>254 ··<span·class="text">Reference</span>
255 </h2>255 </h2>
256 <p>A·term·that·is·<a·href="../../doc/system/system_limits.html#unique_references">unique</a>256 <p>A·term·that·is·<a·href="../../doc/system/system_limits.html#unique_references">unique</a>
257 among·connected·nodes.·A·reference·is·created·by·calling·the257 among·connected·nodes.·A·reference·is·created·by·calling·the
258 <a·href="../../erts-15.2.6/doc/html/erlang.html#make_ref/0"><code·class="inline">make_ref/0</code></a>·BIF.·The258 <a·href="../../erts-15.2.6/doc/html/erlang.html#make_ref/0"><code·class="inline">make_ref/0</code></a>·BIF.·The
259 <a·href="../../erts-15.2.6/doc/html/erlang.html#is_reference/1"><code·class="inline">is_reference/1</code></a>·BIF·tests·whether·a·term259 <a·href="../../erts-15.2.6/doc/html/erlang.html#is_reference/1"><code·class="inline">is_reference/1</code></a>·BIF·tests·whether·a·term
260 is·a·reference.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="5447691179-1">(</span><span·class="p"·data-group-id="5447691179-1">)</span><span·class="p">.</span><span·class="w">260 is·a·reference.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="0964724337-1">(</span><span·class="p"·data-group-id="0964724337-1">)</span><span·class="p">.</span><span·class="w">
261 </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.76482849</span><span·class="p">.</span><span·class="mf">3801088007.198204</span><span·class="o">&gt;</span><span·class="gp·unselectable">261 </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.76482849</span><span·class="p">.</span><span·class="mf">3801088007.198204</span><span·class="o">&gt;</span><span·class="gp·unselectable">
262 2&gt;·</span><span·class="nf">is_reference</span><span·class="p"·data-group-id="5447691179-2">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="5447691179-2">)</span><span·class="p">.</span><span·class="w">262 2&gt;·</span><span·class="nf">is_reference</span><span·class="p"·data-group-id="0964724337-2">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="0964724337-2">)</span><span·class="p">.</span><span·class="w">
263 </span><span·class="ss">true</span></code></pre><h2·id="fun"·class="section-heading">263 </span><span·class="ss">true</span></code></pre><h2·id="fun"·class="section-heading">
264 ··<a·href="#fun"·class="hover-link">264 ··<a·href="#fun"·class="hover-link">
265 ····<i·class="ri-link-m"·aria-hidden="true"></i>265 ····<i·class="ri-link-m"·aria-hidden="true"></i>
266 ··</a>266 ··</a>
267 ··<span·class="text">Fun</span>267 ··<span·class="text">Fun</span>
268 </h2>268 </h2>
269 <p>A·fun·is·a·functional·object.·Funs·make·it·possible·to·create·an·anonymous269 <p>A·fun·is·a·functional·object.·Funs·make·it·possible·to·create·an·anonymous
270 function·and·pass·the·function·itself··not·its·name··as·argument·to·other270 function·and·pass·the·function·itself··not·its·name··as·argument·to·other
271 functions.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Fun1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7135243641-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="7135243641-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="o">+</span><span·class="mi">1</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">271 functions.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Fun1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="3765989419-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="3765989419-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="o">+</span><span·class="mi">1</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
272 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">6.39074546</span><span·class="o">&gt;</span><span·class="gp·unselectable">272 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">6.39074546</span><span·class="o">&gt;</span><span·class="gp·unselectable">
273 2&gt;·</span><span·class="n">Fun1</span><span·class="p"·data-group-id="7135243641-2">(</span><span·class="mi">2</span><span·class="p"·data-group-id="7135243641-2">)</span><span·class="p">.</span><span·class="w">273 2&gt;·</span><span·class="n">Fun1</span><span·class="p"·data-group-id="3765989419-2">(</span><span·class="mi">2</span><span·class="p"·data-group-id="3765989419-2">)</span><span·class="p">.</span><span·class="w">
274 </span><span·class="mi">3</span></code></pre><p>The·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_function/1"><code·class="inline">is_function/1</code></a>·and·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_function/2"><code·class="inline">is_function/2</code></a>274 </span><span·class="mi">3</span></code></pre><p>The·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_function/1"><code·class="inline">is_function/1</code></a>·and·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_function/2"><code·class="inline">is_function/2</code></a>
275 BIFs·tests·whether·a·term·is·a·fun.</p><p><em>Examples</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="5850208895-1">(</span><span·class="p"·data-group-id="5850208895-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">275 BIFs·tests·whether·a·term·is·a·fun.</p><p><em>Examples</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0062579877-1">(</span><span·class="p"·data-group-id="0062579877-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
276 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">43.105768164</span><span·class="o">&gt;</span><span·class="gp·unselectable">276 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">43.105768164</span><span·class="o">&gt;</span><span·class="gp·unselectable">
277 2&gt;·</span><span·class="nf">is_function</span><span·class="p"·data-group-id="5850208895-2">(</span><span·class="n">F</span><span·class="p"·data-group-id="5850208895-2">)</span><span·class="p">.</span><span·class="w">277 2&gt;·</span><span·class="nf">is_function</span><span·class="p"·data-group-id="0062579877-2">(</span><span·class="n">F</span><span·class="p"·data-group-id="0062579877-2">)</span><span·class="p">.</span><span·class="w">
278 </span><span·class="ss">true</span><span·class="gp·unselectable">278 </span><span·class="ss">true</span><span·class="gp·unselectable">
279 3&gt;·</span><span·class="nf">is_function</span><span·class="p"·data-group-id="5850208895-3">(</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="5850208895-3">)</span><span·class="p">.</span><span·class="w">279 3&gt;·</span><span·class="nf">is_function</span><span·class="p"·data-group-id="0062579877-3">(</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="0062579877-3">)</span><span·class="p">.</span><span·class="w">
280 </span><span·class="ss">true</span><span·class="gp·unselectable">280 </span><span·class="ss">true</span><span·class="gp·unselectable">
281 4&gt;·</span><span·class="nf">is_function</span><span·class="p"·data-group-id="5850208895-4">(</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5850208895-4">)</span><span·class="p">.</span><span·class="w">281 4&gt;·</span><span·class="nf">is_function</span><span·class="p"·data-group-id="0062579877-4">(</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0062579877-4">)</span><span·class="p">.</span><span·class="w">
282 </span><span·class="ss">false</span></code></pre><p>Read·more·about·funs·in·<a·href="expressions.html#fun-expressions">Fun·Expressions</a>.·For·more282 </span><span·class="ss">false</span></code></pre><p>Read·more·about·funs·in·<a·href="expressions.html#fun-expressions">Fun·Expressions</a>.·For·more
283 examples,·see·<a·href="../../doc/system/funs.html">Programming·Examples</a>.</p><h2·id="port-identifier"·class="section-heading">283 examples,·see·<a·href="../../doc/system/funs.html">Programming·Examples</a>.</p><h2·id="port-identifier"·class="section-heading">
284 ··<a·href="#port-identifier"·class="hover-link">284 ··<a·href="#port-identifier"·class="hover-link">
285 ····<i·class="ri-link-m"·aria-hidden="true"></i>285 ····<i·class="ri-link-m"·aria-hidden="true"></i>
286 ··</a>286 ··</a>
287 ··<span·class="text">Port·Identifier</span>287 ··<span·class="text">Port·Identifier</span>
288 </h2>288 </h2>
Offset 300, 94 lines modifiedOffset 300, 94 lines modified
300 for·a·new·process·after·a·while.</p><p>The·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·returns·the·Pid·of·the·calling·process.·When300 for·a·new·process·after·a·while.</p><p>The·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·returns·the·Pid·of·the·calling·process.·When
301 <a·href="ref_man_processes.html#process-creation">creating·a·new·process</a>,·the·parent301 <a·href="ref_man_processes.html#process-creation">creating·a·new·process</a>,·the·parent
302 process·will·be·able·to·get·the·Pid·of·the·child·process·either·via·the·return302 process·will·be·able·to·get·the·Pid·of·the·child·process·either·via·the·return
303 value,·as·is·the·case·when·calling·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/3"><code·class="inline">spawn/3</code></a>·BIF,·or·via303 value,·as·is·the·case·when·calling·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/3"><code·class="inline">spawn/3</code></a>·BIF,·or·via
304 a·message,·which·is·the·case·when·calling·the304 a·message,·which·is·the·case·when·calling·the
305 <a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_request/5"><code·class="inline">spawn_request/5</code></a>·BIF.·A·Pid·is·typically·used·when305 <a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_request/5"><code·class="inline">spawn_request/5</code></a>·BIF.·A·Pid·is·typically·used·when
306 when·sending·a·process·a·<a·href="ref_man_processes.html#signals">signal</a>.·The306 when·sending·a·process·a·<a·href="ref_man_processes.html#signals">signal</a>.·The
307 <a·href="../../erts-15.2.6/doc/html/erlang.html#is_pid/1"><code·class="inline">is_pid/1</code></a>·BIF·tests·whether·a·term·is·a·Pid.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9110610086-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="9110610086-1">)</span><span·class="p">.</span><span·class="w">307 <a·href="../../erts-15.2.6/doc/html/erlang.html#is_pid/1"><code·class="inline">is_pid/1</code></a>·BIF·tests·whether·a·term·is·a·Pid.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1070572624-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="1070572624-1">)</span><span·class="p">.</span><span·class="w">
308 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9110610086-2">(</span><span·class="p"·data-group-id="9110610086-3">[</span><span·class="ss">loop</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="9110610086-3">]</span><span·class="p"·data-group-id="9110610086-2">)</span><span·class="p">.</span><span·class="w">308 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1070572624-2">(</span><span·class="p"·data-group-id="1070572624-3">[</span><span·class="ss">loop</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="1070572624-3">]</span><span·class="p"·data-group-id="1070572624-2">)</span><span·class="p">.</span><span·class="w">
  
309 </span><span·class="nf">loop</span><span·class="p"·data-group-id="9110610086-4">(</span><span·class="p"·data-group-id="9110610086-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">309 </span><span·class="nf">loop</span><span·class="p"·data-group-id="1070572624-4">(</span><span·class="p"·data-group-id="1070572624-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
310 ····</span><span·class="k">receive</span><span·class="w">310 ····</span><span·class="k">receive</span><span·class="w">
311 ········</span><span·class="ss">who_are_you</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">311 ········</span><span·class="ss">who_are_you</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
312 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9110610086-5">(</span><span·class="s">&quot;I·am·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9110610086-6">[</span><span·class="nf">s[·...·truncated·by·diffoscope;·len:·210,·SHA:·7efe4022dc6486f5d8e3ad327e69f4eefc7edf94d955101c69ce876b07490e98·...·]-5">)</span><span·class="p">,</span><span·class="w">312 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1070572624-5">(</span><span·class="s">&quot;I·am·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1070572624-6">[</span><span·class="nf">s[·...·truncated·by·diffoscope;·len:·210,·SHA:·9b09bf2e96ee8b4a9ba50a2f78d8ddcb17b5e685e6a5bd954140d1be3bd01026·...·]-5">)</span><span·class="p">,</span><span·class="w">
313 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="9110610086-8">(</span><span·class="p"·data-group-id="9110610086-8">)</span><span·class="w">313 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="1070572624-8">(</span><span·class="p"·data-group-id="1070572624-8">)</span><span·class="w">
314 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">314 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
315 </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="9110610086-9">(</span><span·class="ss">m</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loop</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9110610086-10">[</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·64,·SHA:·8ba57d48914ed22293d668d333dfb997b5b7872da14e9616564e298311c43c62·...·]-9">)</span><span·class="p">.</span><span·class="w">315 </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1070572624-9">(</span><span·class="ss">m</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loop</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1070572624-10">[</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·64,·SHA:·40c269449186b89066b8b6385e565d73357edede70b9c830d57f0c40acc5ad24·...·]-9">)</span><span·class="p">.</span><span·class="w">
316 </span><span·class="o">&lt;</span><span·class="mf">0.58</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">316 </span><span·class="o">&lt;</span><span·class="mf">0.58</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
317 2&gt;·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">who_are_you</span><span·class="p">.</span><span·class="w">317 2&gt;·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">who_are_you</span><span·class="p">.</span><span·class="w">
318 </span><span·class="n">I</span><span·class="w">·</span><span·class="ss">am</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.58</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">318 </span><span·class="n">I</span><span·class="w">·</span><span·class="ss">am</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.58</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">
319 </span><span·class="ss">who_are_you</span></code></pre><p>Read·more·about·processes·in·<a·href="ref_man_processes.html">Processes</a>.</p><h2·id="tuple"·class="section-heading">319 </span><span·class="ss">who_are_you</span></code></pre><p>Read·more·about·processes·in·<a·href="ref_man_processes.html">Processes</a>.</p><h2·id="tuple"·class="section-heading">
320 ··<a·href="#tuple"·class="hover-link">320 ··<a·href="#tuple"·class="hover-link">
321 ····<i·class="ri-link-m"·aria-hidden="true"></i>321 ····<i·class="ri-link-m"·aria-hidden="true"></i>
322 ··</a>322 ··</a>
323 ··<span·class="text">Tuple</span>323 ··<span·class="text">Tuple</span>
324 </h2>324 </h2>
325 <p>A·tuple·is·a·compound·data·type·with·a·fixed·number·of·terms:</p><pre><code·class="text">{Term1,...,TermN}</code></pre><p>Each·term·<code·class="inline">Term</code>·in·the·tuple·is·called·an·<em>element</em>.·The·number·of·elements·is325 <p>A·tuple·is·a·compound·data·type·with·a·fixed·number·of·terms:</p><pre><code·class="text">{Term1,...,TermN}</code></pre><p>Each·term·<code·class="inline">Term</code>·in·the·tuple·is·called·an·<em>element</em>.·The·number·of·elements·is
326 said·to·be·the·<em>size</em>·of·the·tuple.</p><p>There·exists·a·number·of·BIFs·to·manipulate·tuples.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9356109994-1">{</span><span·class="ss">adam</span><span·class="p">,</span><span·class="mi">24</span><span·class="p">,</span><span·class="p"·data-group-id="9356109994-2">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·f0dcb29d0ab1c74af7770b701d268e0e6bd2f6a7e64296175f620f53e441e5d2·...·]-1">}</span><span·class="p">.</span><span·class="w">326 said·to·be·the·<em>size</em>·of·the·tuple.</p><p>There·exists·a·number·of·BIFs·to·manipulate·tuples.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8817444023-1">{</span><span·class="ss">adam</span><span·class="p">,</span><span·class="mi">24</span><span·class="p">,</span><span·class="p"·data-group-id="8817444023-2">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·d7bb9fd489a8cd28bbdd1af920ff9e46d42aeca8ef1fc1e6df677217269b6028·...·]-1">}</span><span·class="p">.</span><span·class="w">
327 </span><span·class="p"·data-group-id="9356109994-3">{</span><span·class="ss">adam</span><span·class="p">,</span><span·class="mi">24</span><span·class="p">,</span><span·class="p"·data-group-id="9356109994-4">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·3bd2170c027eb9b01f2bff6e97ea0b080b4a76701dae4a6a1a872d59e31ef9d7·...·]-3">}</span><span·class="gp·unselectable">327 </span><span·class="p"·data-group-id="8817444023-3">{</span><span·class="ss">adam</span><span·class="p">,</span><span·class="mi">24</span><span·class="p">,</span><span·class="p"·data-group-id="8817444023-4">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·aab32d555c1223d103361429980ecd672dd92a0952eccea26afaed7d3fff2eae·...·]-3">}</span><span·class="gp·unselectable">
328 2&gt;·</span><span·class="nf">element</span><span·class="p"·data-group-id="9356109994-5">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">P</span><span·class="p"·data-group-id="9356109994-5">)</span><span·class="p">.</span><span·class="w">328 2&gt;·</span><span·class="nf">element</span><span·class="p"·data-group-id="8817444023-5">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">P</span><span·class="p"·data-group-id="8817444023-5">)</span><span·class="p">.</span><span·class="w">
329 </span><span·class="ss">adam</span><span·class="gp·unselectable">329 </span><span·class="ss">adam</span><span·class="gp·unselectable">
330 3&gt;·</span><span·class="nf">element</span><span·class="p"·data-group-id="9356109994-6">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="n">P</span><span·class="p"·data-group-id="9356109994-6">)</span><span·class="p">.</span><span·class="w">330 3&gt;·</span><span·class="nf">element</span><span·class="p"·data-group-id="8817444023-6">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="n">P</span><span·class="p"·data-group-id="8817444023-6">)</span><span·class="p">.</span><span·class="w">
331 </span><span·class="p"·data-group-id="9356109994-7">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><span·class="p"·data-group-id="9356109994-7">}</span><span·class="gp·unselectable">331 </span><span·class="p"·data-group-id="8817444023-7">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><span·class="p"·data-group-id="8817444023-7">}</span><span·class="gp·unselectable">
332 4&gt;·</span><span·class="n">P2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">setelement</span><span·class="p"·data-group-id="9356109994-8">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="n">P</span><span·class="p">,</span><span·class="mi">25</span><span·class="p"·data-group-id="9356109994-8">)</span><span·class="p">.</span><span·class="w">332 4&gt;·</span><span·class="n">P2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">setelement</span><span·class="p"·data-group-id="8817444023-8">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="n">P</span><span·class="p">,</span><span·class="mi">25</span><span·class="p"·data-group-id="8817444023-8">)</span><span·class="p">.</span><span·class="w">
333 </span><span·class="p"·data-group-id="9356109994-9">{</span><span·class="ss">adam</span><span·class="p">,</span><span·class="mi">25</span><span·class="p">,</span><span·class="p"·data-group-id="9356109994-10">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span>[·...·truncated·by·diffoscope;·len:·95,·SHA:·3a596c82a76258f74c4e20d07d522a23f9cc30c9149293601e0e23c69c708899·...·]-9">}</span><span·class="gp·unselectable">333 </span><span·class="p"·data-group-id="8817444023-9">{</span><span·class="ss">adam</span><span·class="p">,</span><span·class="mi">25</span><span·class="p">,</span><span·class="p"·data-group-id="8817444023-10">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span>[·...·truncated·by·diffoscope;·len:·95,·SHA:·6c77bf24c4782eed454b83802ed8a6d028d3bc0c292186ba0f52871f1b1716c9·...·]-9">}</span><span·class="gp·unselectable">
334 5&gt;·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="9356109994-11">(</span><span·class="n">P</span><span·class="p"·data-group-id="9356109994-11">)</span><span·class="p">.</span><span·class="w">334 5&gt;·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="8817444023-11">(</span><span·class="n">P</span><span·class="p"·data-group-id="8817444023-11">)</span><span·class="p">.</span><span·class="w">
335 </span><span·class="mi">3</span><span·class="gp·unselectable">335 </span><span·class="mi">3</span><span·class="gp·unselectable">
336 6&gt;·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="9356109994-12">(</span><span·class="p"·data-group-id="9356109994-13">{</span><span·class="p"·data-group-id="9356109994-13">}</span><span·class="p"·data-group-id="9356109994-12">)</span><span·class="p">.</span><span·class="w">336 6&gt;·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="8817444023-12">(</span><span·class="p"·data-group-id="8817444023-13">{</span><span·class="p"·data-group-id="8817444023-13">}</span><span·class="p"·data-group-id="8817444023-12">)</span><span·class="p">.</span><span·class="w">
337 </span><span·class="mi">0</span><span·class="gp·unselectable">337 </span><span·class="mi">0</span><span·class="gp·unselectable">
338 7&gt;·</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="9356109994-14">(</span><span·class="p"·data-group-id="9356109994-15">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="9356109994-15">}</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·b9857a24fc8a680a7ce547793971d0f5158724525f6631788ef7971ce379fd34·...·]-14">)</span><span·class="p">.</span><span·class="w">338 7&gt;·</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="8817444023-14">(</span><span·class="p"·data-group-id="8817444023-15">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="8817444023-15">}</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·7f8dcaa35f3d33971108821af2094268ce3395714c31b19c30d43237bb2c9896·...·]-14">)</span><span·class="p">.</span><span·class="w">
339 </span><span·class="ss">true</span></code></pre><h2·id="map"·class="section-heading">339 </span><span·class="ss">true</span></code></pre><h2·id="map"·class="section-heading">
340 ··<a·href="#map"·class="hover-link">340 ··<a·href="#map"·class="hover-link">
341 ····<i·class="ri-link-m"·aria-hidden="true"></i>341 ····<i·class="ri-link-m"·aria-hidden="true"></i>
342 ··</a>342 ··</a>
343 ··<span·class="text">Map</span>343 ··<span·class="text">Map</span>
344 </h2>344 </h2>
345 <p>A·map·is·a·compound·data·type·with·a·variable·number·of·key-value·associations:</p><pre><code·class="text">#{Key1·=&gt;·Value1,·...,·KeyN·=&gt;·ValueN}</code></pre><p>Each·key-value·association·in·the·map·is·called·an·<em>association·pair</em>.·The·key345 <p>A·map·is·a·compound·data·type·with·a·variable·number·of·key-value·associations:</p><pre><code·class="text">#{Key1·=&gt;·Value1,·...,·KeyN·=&gt;·ValueN}</code></pre><p>Each·key-value·association·in·the·map·is·called·an·<em>association·pair</em>.·The·key
346 and·value·parts·of·the·pair·are·called·<em>elements</em>.·The·number·of·association346 and·value·parts·of·the·pair·are·called·<em>elements</em>.·The·number·of·association
347 pairs·is·said·to·be·the·<em>size</em>·of·the·map.</p><p>There·exists·a·number·of·BIFs·to·manipulate·maps.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">M1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5417064458-1">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">adam</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">age</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·453,·SHA:·7bd05d8d5e3cc4022b36c69854103aecbe1dd0dfb35dd8787c24362ddfff26da·...·]-1">}</span><span·class="p">.</span><span·class="w">347 pairs·is·said·to·be·the·<em>size</em>·of·the·map.</p><p>There·exists·a·number·of·BIFs·to·manipulate·maps.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">M1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1212988824-1">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">adam</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">age</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·453,·SHA:·70fcfbfa309c458018ea2f1e983a78effa844a5dce5755a80dcb43c5422af049·...·]-1">}</span><span·class="p">.</span><span·class="w">
348 </span><span·class="p"·data-group-id="5417064458-3">#{</span><span·class="ss">age</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">24</span><span·class="p">,</span><span·class="ss">date</span><span·class="w">·</span><span·class="p">=&gt;</span>[·...·truncated·by·diffoscope;·len:·405,·SHA:·513cc3112cdef84fb2cc27db788122e979081434a630b000c5d08ec258ad60c5·...·]-3">}</span><span·class="gp·unselectable">348 </span><span·class="p"·data-group-id="1212988824-3">#{</span><span·class="ss">age</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">24</span><span·class="p">,</span><span·class="ss">date</span><span·class="w">·</span><span·class="p">=&gt;</span>[·...·truncated·by·diffoscope;·len:·405,·SHA:·203830d8bf9446036dde4eeb663321e4b4fd09a324888566685cbb4b4ca4fb9d·...·]-3">}</span><span·class="gp·unselectable">
349 2&gt;·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="5417064458-5">(</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M1</span><span·class="p"·data-group-id="5417064458-5">)</span><span·class="p">.</span><span·class="w">349 2&gt;·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="1212988824-5">(</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M1</span><span·class="p"·data-group-id="1212988824-5">)</span><span·class="p">.</span><span·class="w">
350 </span><span·class="ss">adam</span><span·class="gp·unselectable">350 </span><span·class="ss">adam</span><span·class="gp·unselectable">
351 3&gt;·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="5417064458-6">(</span><span·class="ss">date</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M1</span><span·class="p"·data-group-id="5417064458-6">)</span><span·class="p">.</span><span·class="w">351 3&gt;·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="1212988824-6">(</span><span·class="ss">date</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M1</span><span·class="p"·data-group-id="1212988824-6">)</span><span·class="p">.</span><span·class="w">
352 </span><span·class="p"·data-group-id="5417064458-7">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><span·class="p"·data-group-id="5417064458-7">}</span><span·class="gp·unselectable">352 </span><span·class="p"·data-group-id="1212988824-7">{</span><span·class="ss">july</span><span·class="p">,</span><span·class="mi">29</span><span·class="p"·data-group-id="1212988824-7">}</span><span·class="gp·unselectable">
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332 ········Built·using332 ········Built·using
333 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the333 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
334 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>334 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
335 ······</p>335 ······</p>
336 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>336 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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338 ··</div>338 ··</div>
339 </main>339 </main>
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152 the·code·for·a·process·in·a·generic·part·(a·behaviour·module)·and·a·specific152 the·code·for·a·process·in·a·generic·part·(a·behaviour·module)·and·a·specific
153 part·(a·<em>callback·module</em>).</p><p>The·behaviour·module·is·part·of·Erlang/OTP.·To·implement·a·process·such·as·a153 part·(a·<em>callback·module</em>).</p><p>The·behaviour·module·is·part·of·Erlang/OTP.·To·implement·a·process·such·as·a
154 supervisor,·the·user·only·needs·to·implement·the·callback·module,·which·is·to154 supervisor,·the·user·only·needs·to·implement·the·callback·module,·which·is·to
155 export·a·pre-defined·set·of·functions,·the·<em>callback·functions</em>.</p><p>The·following·example·illustrate·how·code·can·be·divided·into·a·generic·and·a155 export·a·pre-defined·set·of·functions,·the·<em>callback·functions</em>.</p><p>The·following·example·illustrate·how·code·can·be·divided·into·a·generic·and·a
156 specific·part.·Consider·the·following·code·(written·in·plain·Erlang)·for·a156 specific·part.·Consider·the·following·code·(written·in·plain·Erlang)·for·a
157 simple·server,·which·keeps·track·of·a·number·of·&quot;channels&quot;.·Other·processes·can157 simple·server,·which·keeps·track·of·a·number·of·&quot;channels&quot;.·Other·processes·can
158 allocate·and·free·the·channels·by·calling·the·functions·<code·class="inline">alloc/0</code>·and·<code·class="inline">free/1</code>,158 allocate·and·free·the·channels·by·calling·the·functions·<code·class="inline">alloc/0</code>·and·<code·class="inline">free/1</code>,
159 respectively.</p><p><a·href=""·id="ch1"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3580301995-1">(</span><span·class="ss">ch1</span><span·class="p"·data-group-id="3580301995-1">)</span><span·class="p">.</span><span·class="w"> 
160 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3580301995-2">(</span><span·class="p"·data-group-id="3580301995-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class[·...·truncated·by·diffoscope;·len:·85,·SHA:·0abb537e069b1d8e85beb1b72c0ff206905b350c660dca6c4888f234d24ae06b·...·]">)</span><span·class="p">.</span><span·class="w">159 respectively.</p><p><a·href=""·id="ch1"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8821691463-1">(</span><span·class="ss">ch1</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·17,·SHA:·3bc9d75db2d426d693af214f9ed9bd3dce5d1ebc3677aeecc0247b588de00b2c·...·]">)</span><span·class="p">.</span><span·class="w">
 160 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8821691463-2">(</span><span·class="p"·data-group-id="8821691463-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="8821691463-3">]</span><span·class="p"·data-group-id="8821691463-2">)</span><span·class="p">.</span><span·class="w">
161 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3580301995-4">(</span><span·class="p"·data-group-id="3580301995-5">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·538c9258e2c893d8340024b6e010a3eef5ead4f6918992663037cd6eb56e6d95·...·]-4">)</span><span·class="p">.</span><span·class="w">161 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8821691463-4">(</span><span·class="p"·data-group-id="8821691463-5">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·8de514eafbff7e9e474679e84dd56f46d2ad8f23a0ecb978350e6564f1344d3a·...·]-4">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3580301995-6">(</span><span·class="p"·data-group-id="3580301995-7">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3580301995-7">]</span><span·class="p"·data-group-id="3580301995-6">)</span><span·class="p">.</span><span·class="w">162 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8821691463-6">(</span><span·class="p"·data-group-id="8821691463-7">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="8821691463-7">]</span><span·class="p"·data-group-id="8821691463-6">)</span><span·class="p">.</span><span·class="w">
  
163 </span><span·class="nf">start</span><span·class="p"·data-group-id="3580301995-8">(</span><span·class="p"·data-group-id="3580301995-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">163 </span><span·class="nf">start</span><span·class="p"·data-group-id="8821691463-8">(</span><span·class="p"·data-group-id="8821691463-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
164 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="3580301995-9">(</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3580301995-10">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·e9dcada2ab66bf2230fca9cef00ff8b8b7daab6a59a8aadf2cebf732abaf10bc·...·]-9">)</span><span·class="p">.</span><span·class="w">164 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="8821691463-9">(</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8821691463-10">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·5387df2c15f423ad683c65bee9c369a09c86d0bcb203fe89343298b03873a508·...·]-9">)</span><span·class="p">.</span><span·class="w">
  
165 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="3580301995-11">(</span><span·class="p"·data-group-id="3580301995-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">165 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="8821691463-11">(</span><span·class="p"·data-group-id="8821691463-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
166 ····</span><span·class="ss">ch1</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3580301995-12">{</span><span·class="nf">self</span><span·class="p"·data-group-id="3580301995-13">(</span><span·class="p"·data-group-id="3580301995-13">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·e1974cfbf20864f7af7c9a660ed11428a60ae3410754528e0c7074ce3f9b2213·...·]-12">}</span><span·class="p">,</span><span·class="w">166 ····</span><span·class="ss">ch1</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8821691463-12">{</span><span·class="nf">self</span><span·class="p"·data-group-id="8821691463-13">(</span><span·class="p"·data-group-id="8821691463-13">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·f42a73c7bce94ee50a038de3bbee2db023b984bc4c901a98aa8a4ebb1b1abd6e·...·]-12">}</span><span·class="p">,</span><span·class="w">
167 ····</span><span·class="k">receive</span><span·class="w">167 ····</span><span·class="k">receive</span><span·class="w">
168 ········</span><span·class="p"·data-group-id="3580301995-14">{</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Res</span><span·class="p"·data-group-id="3580301995-14">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">168 ········</span><span·class="p"·data-group-id="8821691463-14">{</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Res</span><span·class="p"·data-group-id="8821691463-14">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
169 ············</span><span·class="n">Res</span><span·class="w">169 ············</span><span·class="n">Res</span><span·class="w">
170 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">170 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
171 </span><span·class="nf">free</span><span·class="p"·data-group-id="3580301995-15">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="3580301995-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 </span><span·class="nf">free</span><span·class="p"·data-group-id="8821691463-15">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="8821691463-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ····</span><span·class="ss">ch1</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3580301995-16">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="3580301995-16">}</span><span·class="p">,</span><span·class="w">172 ····</span><span·class="ss">ch1</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8821691463-16">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="8821691463-16">}</span><span·class="p">,</span><span·class="w">
173 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">173 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
174 </span><span·class="nf">init</span><span·class="p"·data-group-id="3580301995-17">(</span><span·class="p"·data-group-id="3580301995-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">174 </span><span·class="nf">init</span><span·class="p"·data-group-id="8821691463-17">(</span><span·class="p"·data-group-id="8821691463-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
175 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="3580301995-18">(</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="3580301995-19">(</span><span·class="p"·data-group-id="3580301995-19">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·29a12407003372819b178c72f7a657251c4f6bdc69fb6f94b15f55991fcf8df2·...·]-18">)</span><span·class="p">,</span><span·class="w">175 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="8821691463-18">(</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8821691463-19">(</span><span·class="p"·data-group-id="8821691463-19">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·b2f41027b468273297c071a5604419c15d51e2f1f66f129df5b8297c35de5917·...·]-18">)</span><span·class="p">,</span><span·class="w">
176 ····</span><span·class="n">Chs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="3580301995-20">(</span><span·class="p"·data-group-id="3580301995-20">)</span><span·class="p">,</span><span·class="w">176 ····</span><span·class="n">Chs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="8821691463-20">(</span><span·class="p"·data-group-id="8821691463-20">)</span><span·class="p">,</span><span·class="w">
177 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="3580301995-21">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="3580301995-21">)</span><span·class="p">.</span><span·class="w">177 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8821691463-21">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="8821691463-21">)</span><span·class="p">.</span><span·class="w">
  
178 </span><span·class="nf">loop</span><span·class="p"·data-group-id="3580301995-22">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="3580301995-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 </span><span·class="nf">loop</span><span·class="p"·data-group-id="8821691463-22">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="8821691463-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ····</span><span·class="k">receive</span><span·class="w">179 ····</span><span·class="k">receive</span><span·class="w">
180 ········</span><span·class="p"·data-group-id="3580301995-23">{</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="3580301995-23">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 ········</span><span·class="p"·data-group-id="8821691463-23">{</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="8821691463-23">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ············</span><span·class="p"·data-group-id="3580301995-24">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3580301995-24">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·143,·SHA:·6c167042bd9f4cb10ddd3022f35bbda0b33a69ab57d19093c9e9cb98d88cd40f·...·]-25">)</span><span·class="p">,</span><span·class="w">181 ············</span><span·class="p"·data-group-id="8821691463-24">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="8821691463-24">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·143,·SHA:·b07c542671a4a7fc5f285302c1e8fecb56c2f8c59366db8301b46c6e3e46ba2e·...·]-25">)</span><span·class="p">,</span><span·class="w">
182 ············</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3580301995-26">{</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="3580301995-26">}</span><span·class="p">,</span><span·class="w">182 ············</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8821691463-26">{</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="8821691463-26">}</span><span·class="p">,</span><span·class="w">
183 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="3580301995-27">(</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3580301995-27">)</span><span·class="p">;</span><span·class="w">183 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8821691463-27">(</span><span·class="n">Chs2</span><span·class="p"·data-group-id="8821691463-27">)</span><span·class="p">;</span><span·class="w">
184 ········</span><span·class="p"·data-group-id="3580301995-28">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="3580301995-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 ········</span><span·class="p"·data-group-id="8821691463-28">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="8821691463-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ············</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="3580301995-29">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="3580301995-29">)</span><span·class="p">,</span><span·class="w">185 ············</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="8821691463-29">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="8821691463-29">)</span><span·class="p">,</span><span·class="w">
186 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="3580301995-30">(</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3580301995-30">)</span><span·class="w">186 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8821691463-30">(</span><span·class="n">Chs2</span><span·class="p"·data-group-id="8821691463-30">)</span><span·class="w">
187 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·code·for·the·server·can·be·rewritten·into·a·generic·part·<code·class="inline">server.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2239480370-1">(</span><span·class="ss">server</span><span·class="p"·data-group-id="2239480370-1">)</span><span·class="p">.</span><span·class="w">187 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·code·for·the·server·can·be·rewritten·into·a·generic·part·<code·class="inline">server.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8789818242-1">(</span><span·class="ss">server</span><span·class="p"·data-group-id="8789818242-1">)</span><span·class="p">.</span><span·class="w">
188 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2239480370-2">(</span><span·class="p"·data-group-id="2239480370-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="2239480370-3">]</span><span·class="p"·data-group-id="2239480370-2">)</span><span·class="p">.</span><span·class="w">188 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8789818242-2">(</span><span·class="p"·data-group-id="8789818242-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="8789818242-3">]</span><span·class="p"·data-group-id="8789818242-2">)</span><span·class="p">.</span><span·class="w">
189 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2239480370-4">(</span><span·class="p"·data-group-id="2239480370-5">[</span><span·class="ss">call</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cast</span><span·class="p">/</span><spa[·...·truncated·by·diffoscope;·len:·115,·SHA:·e335c1c120142432031d6c56c822d6c66b43620ada36e272b00cf7488c027161·...·]-4">)</span><span·class="p">.</span><span·class="w">189 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8789818242-4">(</span><span·class="p"·data-group-id="8789818242-5">[</span><span·class="ss">call</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cast</span><span·class="p">/</span><spa[·...·truncated·by·diffoscope;·len:·115,·SHA:·5c805a71c4560f75ae1618231ddf3c085fe99daec7541172fe5fdd8de87f960e·...·]-4">)</span><span·class="p">.</span><span·class="w">
190 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2239480370-6">(</span><span·class="p"·data-group-id="2239480370-7">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="2239480370-7">]</span><span·class="p"·data-group-id="2239480370-6">)</span><span·class="p">.</span><span·class="w">190 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8789818242-6">(</span><span·class="p"·data-group-id="8789818242-7">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="8789818242-7">]</span><span·class="p"·data-group-id="8789818242-6">)</span><span·class="p">.</span><span·class="w">
  
191 </span><span·class="nf">start</span><span·class="p"·data-group-id="2239480370-8">(</span><span·class="n">Mod</span><span·class="p"·data-group-id="2239480370-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 </span><span·class="nf">start</span><span·class="p"·data-group-id="8789818242-8">(</span><span·class="n">Mod</span><span·class="p"·data-group-id="8789818242-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2239480370-9">(</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2239480370-10">[</span><span·class="n">Mod</span>[·...·truncated·by·diffoscope;·len:·95,·SHA:·e6a848bec3898326441aa56fd5d0dcbdc0b5ce2d6559505a0a457313a7731dd1·...·]-9">)</span><span·class="p">.</span><span·class="w">192 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="8789818242-9">(</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8789818242-10">[</span><span·class="n">Mod</span>[·...·truncated·by·diffoscope;·len:·95,·SHA:·c876961fa18fb0f3be1f46c91358dbd02b5d5012829cf4ec8d94e214d25bb9af·...·]-9">)</span><span·class="p">.</span><span·class="w">
  
193 </span><span·class="nf">call</span><span·class="p"·data-group-id="2239480370-11">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="2239480370-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 </span><span·class="nf">call</span><span·class="p"·data-group-id="8789818242-11">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="8789818242-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2239480370-12">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="2239480370-13">(</span><span·class="p"·data-group-id="2239480370-13">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·146e6d3932fa0b08db8da6eaf05651bc8ea61c6bed5ce5571d520033d7672cf4·...·]-12">}</span><span·class="p">,</span><span·class="w">194 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8789818242-12">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8789818242-13">(</span><span·class="p"·data-group-id="8789818242-13">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·61d38a418662114ea13e2b4150c67e757668eeabc8bfb127b3859ba2c118850c·...·]-12">}</span><span·class="p">,</span><span·class="w">
195 ····</span><span·class="k">receive</span><span·class="w">195 ····</span><span·class="k">receive</span><span·class="w">
196 ········</span><span·class="p"·data-group-id="2239480370-14">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Res</span><span·class="p"·data-group-id="2239480370-14">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">196 ········</span><span·class="p"·data-group-id="8789818242-14">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Res</span><span·class="p"·data-group-id="8789818242-14">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
197 ············</span><span·class="n">Res</span><span·class="w">197 ············</span><span·class="n">Res</span><span·class="w">
198 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">198 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
199 </span><span·class="nf">cast</span><span·class="p"·data-group-id="2239480370-15">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="2239480370-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">199 </span><span·class="nf">cast</span><span·class="p"·data-group-id="8789818242-15">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="8789818242-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
200 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2239480370-16">{</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="2239480370-16">}</span><span·class="p">,</span><span·class="w">200 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8789818242-16">{</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="8789818242-16">}</span><span·class="p">,</span><span·class="w">
201 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">201 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
202 </span><span·class="nf">init</span><span·class="p"·data-group-id="2239480370-17">(</span><span·class="n">Mod</span><span·class="p"·data-group-id="2239480370-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">202 </span><span·class="nf">init</span><span·class="p"·data-group-id="8789818242-17">(</span><span·class="n">Mod</span><span·class="p"·data-group-id="8789818242-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
203 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="2239480370-18">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="2239480370-19">(</span><span·class="p"·data-group-id="2239480370-19">)</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·8f3744e361a7f0de18ccdd97b2f36db5ea949a93215841592397268ac70ca2dc·...·]-18">)</span><span·class="p">,</span><span·class="w">203 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="8789818242-18">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="8789818242-19">(</span><span·class="p"·data-group-id="8789818242-19">)</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·ca738600ccdeff6e1373778bf8469bd53c73e42a64d9d82bee5ec5f29d57aaee·...·]-18">)</span><span·class="p">,</span><span·class="w">
204 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">:</span><span·class="nf">init</span><span·class="p"·data-group-id="2239480370-20">(</span><span·class="p"·data-group-id="2239480370-20">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">:</span><span·class="nf">init</span><span·class="p"·data-group-id="8789818242-20">(</span><span·class="p"·data-group-id="8789818242-20">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="2239480370-21">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="2239480370-21">)</span><span·class="p">.</span><span·class="w">205 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8789818242-21">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8789818242-21">)</span><span·class="p">.</span><span·class="w">
  
206 </span><span·class="nf">loop</span><span·class="p"·data-group-id="2239480370-22">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="2239480370-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 </span><span·class="nf">loop</span><span·class="p"·data-group-id="8789818242-22">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8789818242-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ····</span><span·class="k">receive</span><span·class="w">207 ····</span><span·class="k">receive</span><span·class="w">
208 ········</span><span·class="p"·data-group-id="2239480370-23">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="2239480370-23">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 ········</span><span·class="p"·data-group-id="8789818242-23">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="8789818242-23">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 ············</span><span·class="p"·data-group-id="2239480370-24">{</span><span·class="n">Res</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State2</span><span·class="p"·data-group-id="2239480370-24">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·278,·SHA:·3831378b83fc5ac2d215c5ac05f85898f2aacc9a27d355b6c448f8a7b35ea270·...·]-25">)</span><span·class="p">,</span><span·class="w">209 ············</span><span·class="p"·data-group-id="8789818242-24">{</span><span·class="n">Res</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State2</span><span·class="p"·data-group-id="8789818242-24">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·278,·SHA:·c9c7e3d6f9f1c2b5183ed5f6bf040038cf7ac54f1bb510a7b8be054c1ff08f96·...·]-25">)</span><span·class="p">,</span><span·class="w">
210 ············</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2239480370-26">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Res</span><span·class="p"·data-group-id="2239480370-26">}</span><span·class="p">,</span><span·class="w">210 ············</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8789818242-26">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Res</span><span·class="p"·data-group-id="8789818242-26">}</span><span·class="p">,</span><span·class="w">
211 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="2239480370-27">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State2</span><span·class="p"·data-group-id="2239480370-27">)</span><span·class="p">;</span><span·class="w">211 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8789818242-27">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State2</span><span·class="p"·data-group-id="8789818242-27">)</span><span·class="p">;</span><span·class="w">
212 ········</span><span·class="p"·data-group-id="2239480370-28">{</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="2239480370-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">212 ········</span><span·class="p"·data-group-id="8789818242-28">{</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="8789818242-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
213 ············</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">:</span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="2239480370-29">(</span><span·class="n">Req</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="2239480370-29">)</span><span·class="p">,</span><span·class="w">213 ············</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">:</span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="8789818242-29">(</span><span·class="n">Req</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8789818242-29">)</span><span·class="p">,</span><span·class="w">
214 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="2239480370-30">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State2</span><span·class="p"·data-group-id="2239480370-30">)</span><span·class="w">214 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8789818242-30">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State2</span><span·class="p"·data-group-id="8789818242-30">)</span><span·class="w">
215 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>And·a·callback·module·<code·class="inline">ch2.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1180141430-1">(</span><span·class="ss">ch2</span><span·class="p"·data-group-id="1180141430-1">)</span><span·class="p">.</span><span·class="w">215 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>And·a·callback·module·<code·class="inline">ch2.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7784828877-1">(</span><span·class="ss">ch2</span><span·class="p"·data-group-id="7784828877-1">)</span><span·class="p">.</span><span·class="w">
216 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1180141430-2">(</span><span·class="p"·data-group-id="1180141430-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="1180141430-3">]</span><span·class="p"·data-group-id="1180141430-2">)</span><span·class="p">.</span><span·class="w">216 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7784828877-2">(</span><span·class="p"·data-group-id="7784828877-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="7784828877-3">]</span><span·class="p"·data-group-id="7784828877-2">)</span><span·class="p">.</span><span·class="w">
217 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1180141430-4">(</span><span·class="p"·data-group-id="1180141430-5">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·7fab529b04e539c26da07d085f6dc6af3074b0592d2c94ac37d5a6d9535dd79b·...·]-4">)</span><span·class="p">.</span><span·class="w">217 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7784828877-4">(</span><span·class="p"·data-group-id="7784828877-5">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·7e80865963a9771f284e6c09569d5f6cbcfedddaf902fffae05ef9e76b236937·...·]-4">)</span><span·class="p">.</span><span·class="w">
218 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1180141430-6">(</span><span·class="p"·data-group-id="1180141430-7">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</sp[·...·truncated·by·diffoscope;·len:·254,·SHA:·b874bf374860e353b3805142a23cbe9bc9de675054f9074b960cdb237f395ba4·...·]-6">)</span><span·class="p">.</span><span·class="w">218 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7784828877-6">(</span><span·class="p"·data-group-id="7784828877-7">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</sp[·...·truncated·by·diffoscope;·len:·254,·SHA:·bb4c6812e34b85995a18702df0db362d0675a5364b1221a81b57e033f6f8c635·...·]-6">)</span><span·class="p">.</span><span·class="w">
  
219 </span><span·class="nf">start</span><span·class="p"·data-group-id="1180141430-8">(</span><span·class="p"·data-group-id="1180141430-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 </span><span·class="nf">start</span><span·class="p"·data-group-id="7784828877-8">(</span><span·class="p"·data-group-id="7784828877-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1180141430-9">(</span><span·class="ss">ch2</span><span·class="p"·data-group-id="1180141430-9">)</span><span·class="p">.</span><span·class="w">220 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="7784828877-9">(</span><span·class="ss">ch2</span><span·class="p"·data-group-id="7784828877-9">)</span><span·class="p">.</span><span·class="w">
  
221 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="1180141430-10">(</span><span·class="p"·data-group-id="1180141430-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">221 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="7784828877-10">(</span><span·class="p"·data-group-id="7784828877-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
222 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="1180141430-11">(</span><span·class="ss">ch2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="1180141430-11">)</span><span·class="p">.</span><span·class="w">222 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="7784828877-11">(</span><span·class="ss">ch2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="7784828877-11">)</span><span·class="p">.</span><span·class="w">
  
223 </span><span·class="nf">free</span><span·class="p"·data-group-id="1180141430-12">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="1180141430-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">223 </span><span·class="nf">free</span><span·class="p"·data-group-id="7784828877-12">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="7784828877-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
224 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="1180141430-13">(</span><span·class="ss">ch2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1180141430-14">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><sp[·...·truncated·by·diffoscope;·len:·92,·SHA:·90d2e44b0466b40359912b14d6c8c433a70ec48f776e3404b57c4c31baaa310f·...·]-13">)</span><span·class="p">.</span><span·class="w">224 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="7784828877-13">(</span><span·class="ss">ch2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7784828877-14">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><sp[·...·truncated·by·diffoscope;·len:·92,·SHA:·8724c7cf3bb5695896a281a9ac701aa5c55a669947ec191ef163de5b55f5ffb0·...·]-13">)</span><span·class="p">.</span><span·class="w">
  
225 </span><span·class="nf">init</span><span·class="p"·data-group-id="1180141430-15">(</span><span·class="p"·data-group-id="1180141430-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">225 </span><span·class="nf">init</span><span·class="p"·data-group-id="7784828877-15">(</span><span·class="p"·data-group-id="7784828877-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
226 ····</span><span·class="nf">channels</span><span·class="p"·data-group-id="1180141430-16">(</span><span·class="p"·data-group-id="1180141430-16">)</span><span·class="p">.</span><span·class="w">226 ····</span><span·class="nf">channels</span><span·class="p"·data-group-id="7784828877-16">(</span><span·class="p"·data-group-id="7784828877-16">)</span><span·class="p">.</span><span·class="w">
  
227 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="1180141430-17">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="1180141430-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="7784828877-17">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="7784828877-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ····</span><span·class="nf">alloc</span><span·class="p"·data-group-id="1180141430-18">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="1180141430-18">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·=&gt;·{Ch,Chs2}</span><span·class="w">228 ····</span><span·class="nf">alloc</span><span·class="p"·data-group-id="7784828877-18">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="7784828877-18">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·=&gt;·{Ch,Chs2}</span><span·class="w">
  
229 </span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="1180141430-19">(</span><span·class="p"·data-group-id="1180141430-20">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="1180141430-20">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·44c18b4575f48aebaa675bcf468aeda37761cb637838d4758dd20d4f946e2c4f·...·]-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">229 </span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="7784828877-19">(</span><span·class="p"·data-group-id="7784828877-20">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="7784828877-20">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·48bf03608bcc9e58687a63dd17801d7e82a11d06736d7ba74c0b81fb115021d5·...·]-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
230 ····</span><span·class="nf">free</span><span·class="p"·data-group-id="1180141430-21">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="1180141430-21">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·=&gt;·Chs2</span></code></pre><p>Notice·the·following:</p><ul><li>The·code·in·<code·class="inline">server</code>·can·be·reused·to·build·many·different·servers.</li><li>The·server·name,·in·this·example·the·atom·<code·class="inline">ch2</code>,·is·hidden·from·the·users·of230 ····</span><span·class="nf">free</span><span·class="p"·data-group-id="7784828877-21">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="7784828877-21">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·=&gt;·Chs2</span></code></pre><p>Notice·the·following:</p><ul><li>The·code·in·<code·class="inline">server</code>·can·be·reused·to·build·many·different·servers.</li><li>The·server·name,·in·this·example·the·atom·<code·class="inline">ch2</code>,·is·hidden·from·the·users·of
231 the·client·functions.·This·means·that·the·name·can·be·changed·without231 the·client·functions.·This·means·that·the·name·can·be·changed·without
232 affecting·them.</li><li>The·protocol·(messages·sent·to·and·received·from·the·server)·is·also·hidden.232 affecting·them.</li><li>The·protocol·(messages·sent·to·and·received·from·the·server)·is·also·hidden.
233 This·is·good·programming·practice·and·allows·one·to·change·the·protocol233 This·is·good·programming·practice·and·allows·one·to·change·the·protocol
234 without·changing·the·code·using·the·interface·functions.</li><li>The·functionality·of·<code·class="inline">server</code>·can·be·extended·without·having·to·change·<code·class="inline">ch2</code>234 without·changing·the·code·using·the·interface·functions.</li><li>The·functionality·of·<code·class="inline">server</code>·can·be·extended·without·having·to·change·<code·class="inline">ch2</code>
235 or·any·other·callback·module.</li></ul><p>In·<code·class="inline">ch1.erl</code>·and·<code·class="inline">ch2.erl</code>·above,·the·implementation·of·<code·class="inline">channels/0</code>,·<code·class="inline">alloc/1</code>,235 or·any·other·callback·module.</li></ul><p>In·<code·class="inline">ch1.erl</code>·and·<code·class="inline">ch2.erl</code>·above,·the·implementation·of·<code·class="inline">channels/0</code>,·<code·class="inline">alloc/1</code>,
236 and·<code·class="inline">free/2</code>·has·been·intentionally·left·out,·as·it·is·not·relevant·to·the236 and·<code·class="inline">free/2</code>·has·been·intentionally·left·out,·as·it·is·not·relevant·to·the
237 example.·For·completeness,·one·way·to·write·these·functions·is·given·below.·This237 example.·For·completeness,·one·way·to·write·these·functions·is·given·below.·This
238 is·an·example·only,·a·realistic·implementation·must·be·able·to·handle·situations238 is·an·example·only,·a·realistic·implementation·must·be·able·to·handle·situations
239 like·running·out·of·channels·to·allocate,·and·so·on.</p><p><a·href=""·id="channels-implementation"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">channels</span><span·class="p"·data-group-id="4009877862-1">(</span><span·class="p"·data-group-id="4009877862-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">239 like·running·out·of·channels·to·allocate,·and·so·on.</p><p><a·href=""·id="channels-implementation"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">channels</span><span·class="p"·data-group-id="5458744760-1">(</span><span·class="p"·data-group-id="5458744760-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
240 ···</span><span·class="p"·data-group-id="4009877862-2">{</span><span·class="p">_</span><span·class="n">Allocated</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4009877862-3">[</span><span·class="p"·data-group-id="4009877862-3">]</span>[·...·truncated·by·diffoscope;·len:·498,·SHA:·b707a144d5fe2ad44c7d8d975902c2a2df78876fe532798b3eb45d46baa2e46c·...·]-2">}</span><span·class="p">.</span><span·class="w">240 ···</span><span·class="p"·data-group-id="5458744760-2">{</span><span·class="p">_</span><span·class="n">Allocated</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5458744760-3">[</span><span·class="p"·data-group-id="5458744760-3">]</span>[·...·truncated·by·diffoscope;·len:·498,·SHA:·0e790fedf09d577c8a26317aaea1c4d2acdcee3bf0b75b994270a4c7ac977599·...·]-2">}</span><span·class="p">.</span><span·class="w">
  
241 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="4009877862-5">(</span><span·class="p"·data-group-id="4009877862-6">{</span><span·class="n">Allocated</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4009877862-7">[</span><span·class="n">H</span><span·class="p">|</span>[·...·truncated·by·diffoscope;·len:·294,·SHA:·67c788c11512da9eef886a1bd8f17c31bf30cb353adf9183bf135d77e757bbe1·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">241 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="5458744760-5">(</span><span·class="p"·data-group-id="5458744760-6">{</span><span·class="n">Allocated</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5458744760-7">[</span><span·class="n">H</span><span·class="p">|</span>[·...·truncated·by·diffoscope;·len:·294,·SHA:·78bea14187e746282c3140694c7855a24c15c4e02ade449d785f58d51a220e93·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
242 ···</span><span·class="p"·data-group-id="4009877862-8">{</span><span·class="n">H</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4009877862-9">{</span><span·class="p"·data-group-id="4009877862-10">[</span><span·class="n">H</span><span·class="p">|</span><span·c[·...·truncated·by·diffoscope;·len:·245,·SHA:·3df2e1a6f8935610d8965e3b2544093766765ecfafadaba20550263ed3f22c7c·...·]-8">}</span><span·class="p">.</span><span·class="w">242 ···</span><span·class="p"·data-group-id="5458744760-8">{</span><span·class="n">H</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5458744760-9">{</span><span·class="p"·data-group-id="5458744760-10">[</span><span·class="n">H</span><span·class="p">|</span><span·c[·...·truncated·by·diffoscope;·len:·245,·SHA:·d6eb0301b7515e075ab04e5202f157590e6c2ea245a404923309ab2157af800d·...·]-8">}</span><span·class="p">.</span><span·class="w">
  
243 </span><span·class="nf">free</span><span·class="p"·data-group-id="4009877862-11">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4009877862-12">{</span><span·class="n">Alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Free</span><sp[·...·truncated·by·diffoscope;·len:·195,·SHA:·531b8a7380f27c98f8e25865815098f90af601861184a60d00c5cae4826143f8·...·]-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">243 </span><span·class="nf">free</span><span·class="p"·data-group-id="5458744760-11">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5458744760-12">{</span><span·class="n">Alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Free</span><sp[·...·truncated·by·diffoscope;·len:·195,·SHA:·6f76dcb412992ac974aee405e30bff2d1720127db9a4d04c317be75ca2760420·...·]-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
244 ···</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="4009877862-13">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Alloc</span><span·class="p"·data-group-id="4009877862-13">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">244 ···</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="5458744760-13">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Alloc</span><span·class="p"·data-group-id="5458744760-13">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
245 ······</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">245 ······</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
246 ·········</span><span·class="p"·data-group-id="4009877862-14">{</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="4009877862-15">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Alloc</[·...·truncated·by·diffoscope;·len:·332,·SHA:·426a41aa2595e6f6e86224e64b290ecce84dca23461f90cfebf8d8146428061d·...·]-14">}</span><span·class="p">;</span><span·class="w">246 ·········</span><span·class="p"·data-group-id="5458744760-14">{</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="5458744760-15">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Alloc</[·...·truncated·by·diffoscope;·len:·332,·SHA:·8bbbbe7b81f564eded94fd8e3f6e7cbb03f15837e67d437c84d03c96526128c6·...·]-14">}</span><span·class="p">;</span><span·class="w">
247 ······</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">247 ······</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
248 ·········</span><span·class="n">Channels</span><span·class="w">248 ·········</span><span·class="n">Channels</span><span·class="w">
249 ···</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Code·written·without·using·behaviours·can·be·more·efficient,·but·the·increased249 ···</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Code·written·without·using·behaviours·can·be·more·efficient,·but·the·increased
250 efficiency·is·at·the·expense·of·generality.·The·ability·to·manage·all250 efficiency·is·at·the·expense·of·generality.·The·ability·to·manage·all
251 applications·in·the·system·in·a·consistent·manner·is·important.</p><p>Using·behaviours·also·makes·it·easier·to·read·and·understand·code·written·by251 applications·in·the·system·in·a·consistent·manner·is·important.</p><p>Using·behaviours·also·makes·it·easier·to·read·and·understand·code·written·by
252 other·programmers.·Improvised·programming·structures,·while·possibly·more252 other·programmers.·Improvised·programming·structures,·while·possibly·more
253 efficient,·are·always·more·difficult·to·understand.</p><p>The·<code·class="inline">server</code>·module·corresponds,·greatly·simplified,·to·the·Erlang/OTP·behaviour253 efficient,·are·always·more·difficult·to·understand.</p><p>The·<code·class="inline">server</code>·module·corresponds,·greatly·simplified,·to·the·Erlang/OTP·behaviour
254 <code·class="inline">gen_server</code>.</p><p>The·standard·Erlang/OTP·behaviours·are:</p><ul><li><p><a·href="gen_server_concepts.html">gen_server</a></p><p>For·implementing·the·server·of·a·client-server·relation</p></li><li><p><a·href="statem.html">gen_statem</a></p><p>For·implementing·state·machines</p></li><li><p><a·href="events.html">gen_event</a></p><p>For·implementing·event·handling·functionality</p></li><li><p><a·href="sup_princ.html">supervisor</a></p><p>For·implementing·a·supervisor·in·a·supervision·tree</p></li></ul><p>The·compiler·understands·the·module·attribute·<code·class="inline">-behaviour(Behaviour)</code>·and·issues254 <code·class="inline">gen_server</code>.</p><p>The·standard·Erlang/OTP·behaviours·are:</p><ul><li><p><a·href="gen_server_concepts.html">gen_server</a></p><p>For·implementing·the·server·of·a·client-server·relation</p></li><li><p><a·href="statem.html">gen_statem</a></p><p>For·implementing·state·machines</p></li><li><p><a·href="events.html">gen_event</a></p><p>For·implementing·event·handling·functionality</p></li><li><p><a·href="sup_princ.html">supervisor</a></p><p>For·implementing·a·supervisor·in·a·supervision·tree</p></li></ul><p>The·compiler·understands·the·module·attribute·<code·class="inline">-behaviour(Behaviour)</code>·and·issues
255 warnings·about·missing·callback·functions,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5517555277-1">(</span><span·class="ss">chs3</span><span·class="p"·data-group-id="5517555277-1">)</span><span·class="p">.</span><span·class="w">255 warnings·about·missing·callback·functions,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1329495646-1">(</span><span·class="ss">chs3</span><span·class="p"·data-group-id="1329495646-1">)</span><span·class="p">.</span><span·class="w">
256 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="5517555277-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="5517555277-2">)</span><span·class="p">.</span><span·class="w">256 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="1329495646-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="1329495646-2">)</span><span·class="p">.</span><span·class="w">
257 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">257 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
258 </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">c</span><span·class="p"·data-group-id="5517555277-3">(</span><span·class="ss">chs3</span><span·class="p"·data-group-id="5517555277-3">)</span><span·class="p">.</span><span·class="w">258 </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">c</span><span·class="p"·data-group-id="1329495646-3">(</span><span·class="ss">chs3</span><span·class="p"·data-group-id="1329495646-3">)</span><span·class="p">.</span><span·class="w">
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142 </h2>142 </h2>
143 <p>A·<em>node</em>·is·an·executing·Erlang·runtime·system·that·has·been·given·a·name,·using143 <p>A·<em>node</em>·is·an·executing·Erlang·runtime·system·that·has·been·given·a·name,·using
144 the·command-line·flag·<a·href="../../erts-15.2.6/doc/html/erl_cmd.html#name"><code·class="inline">-name</code></a>·(long·names)·or144 the·command-line·flag·<a·href="../../erts-15.2.6/doc/html/erl_cmd.html#name"><code·class="inline">-name</code></a>·(long·names)·or
145 <a·href="../../erts-15.2.6/doc/html/erl_cmd.html#sname"><code·class="inline">-sname</code></a>·(short·names).</p><p>The·format·of·the·node·name·is·an·atom·<code·class="inline">name@host</code>.·<code·class="inline">name</code>·is·the·name·given·by145 <a·href="../../erts-15.2.6/doc/html/erl_cmd.html#sname"><code·class="inline">-sname</code></a>·(short·names).</p><p>The·format·of·the·node·name·is·an·atom·<code·class="inline">name@host</code>.·<code·class="inline">name</code>·is·the·name·given·by
146 the·user.·<code·class="inline">host</code>·is·the·full·host·name·if·long·names·are·used,·or·the·first·part146 the·user.·<code·class="inline">host</code>·is·the·full·host·name·if·long·names·are·used,·or·the·first·part
147 of·the·host·name·if·short·names·are·used.·Function·<a·href="../../erts-15.2.6/doc/html/erlang.html#node/0"><code·class="inline">node()</code></a>147 of·the·host·name·if·short·names·are·used.·Function·<a·href="../../erts-15.2.6/doc/html/erlang.html#node/0"><code·class="inline">node()</code></a>
148 returns·the·name·of·the·node.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-name·dilbert</span><span·class="w">148 returns·the·name·of·the·node.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-name·dilbert</span><span·class="w">
149 </span><span·class="p"·data-group-id="2118117332-1">(</span><span·class="ss">dilbert@uab</span><span·class="p">.</span><span·class="ss">ericsson</span><span·class="p">.</span><span·class="ss">se</span><span·class="p"·data-group-id="2118117332-1">)</span><span·class="mi">1</span><span·class="o"[·...·truncated·by·diffoscope;·len:·158,·SHA:·2a29fccfb7b20ac01e6443375cd0b09430197bdda768d0d373d1d0c00b8c85ba·...·]-2">)</span><span·class="p">.</span><span·class="w">149 </span><span·class="p"·data-group-id="6849316217-1">(</span><span·class="ss">dilbert@uab</span><span·class="p">.</span><span·class="ss">ericsson</span><span·class="p">.</span><span·class="ss">se</span><span·class="p"·data-group-id="6849316217-1">)</span><span·class="mi">1</span><span·class="o"[·...·truncated·by·diffoscope;·len:·158,·SHA:·3097f7847266fe1ada10c54639372b8710c575997c0e44be8246969c0fdb8f42·...·]-2">)</span><span·class="p">.</span><span·class="w">
150 </span><span·class="ss">&#39;dilbert@uab.ericsson.se&#39;</span><span·class="w">150 </span><span·class="ss">&#39;dilbert@uab.ericsson.se&#39;</span><span·class="w">
  
151 </span><span·class="c1">%·erl·-sname·dilbert</span><span·class="gp·unselectable">151 </span><span·class="c1">%·erl·-sname·dilbert</span><span·class="gp·unselectable">
152 (dilbert@uab)1&gt;·</span><span·class="nf">node</span><span·class="p"·data-group-id="2118117332-3">(</span><span·class="p"·data-group-id="2118117332-3">)</span><span·class="p">.</span><span·class="w">152 (dilbert@uab)1&gt;·</span><span·class="nf">node</span><span·class="p"·data-group-id="6849316217-3">(</span><span·class="p"·data-group-id="6849316217-3">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="ss">dilbert@uab</span></code></pre><p>The·node·name·can·also·be·given·in·runtime·by·calling·<a·href="../../lib/kernel-10.2.6/doc/html/net_kernel.html#start/1"><code·class="inline">net_kernel:start/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl</span><span·class="gp·unselectable">153 </span><span·class="ss">dilbert@uab</span></code></pre><p>The·node·name·can·also·be·given·in·runtime·by·calling·<a·href="../../lib/kernel-10.2.6/doc/html/net_kernel.html#start/1"><code·class="inline">net_kernel:start/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl</span><span·class="gp·unselectable">
154 1&gt;·</span><span·class="nf">node</span><span·class="p"·data-group-id="6808984303-1">(</span><span·class="p"·data-group-id="6808984303-1">)</span><span·class="p">.</span><span·class="w">154 1&gt;·</span><span·class="nf">node</span><span·class="p"·data-group-id="5616944362-1">(</span><span·class="p"·data-group-id="5616944362-1">)</span><span·class="p">.</span><span·class="w">
155 </span><span·class="ss">nonode@nohost</span><span·class="gp·unselectable">155 </span><span·class="ss">nonode@nohost</span><span·class="gp·unselectable">
156 2&gt;·</span><span·class="nc">net_kernel</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6808984303-2">(</span><span·class="p"·data-group-id="6808984303-3">[</span><span·class="ss">dilbert</span><span·class="p">,</span><span·class="ss">shortnames</span><span·class="p"·data-group-id="6808984303-3">]</span><span·class="p"·data-group-id="68089843[·...·truncated·by·diffoscope;·len:·2,·SHA:·0b8efa5a3bf104413a725c6ff0459a6be12b1fd33314cbb138745baf39504ae5·...·]-2">)</span><span·class="p">.</span><span·class="w">156 2&gt;·</span><span·class="nc">net_kernel</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5616944362-2">(</span><span·class="p"·data-group-id="5616944362-3">[</span><span·class="ss">dilbert</span><span·class="p">,</span><span·class="ss">shortnames</span><span·class="p"·data-group-id="5616944362-3">]</span><span·class="p"·data-group-id="56169443[·...·truncated·by·diffoscope;·len:·2,·SHA:·81b8a03f97e8787c53fe1a86bda042b6f0de9b0ec9c09357e107c99ba4d6948a·...·]-2">)</span><span·class="p">.</span><span·class="w">
157 </span><span·class="p"·data-group-id="6808984303-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.102</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="6808984303-4">}</span><span·class="gp·unselectable">157 </span><span·class="p"·data-group-id="5616944362-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.102</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="5616944362-4">}</span><span·class="gp·unselectable">
158 (dilbert@uab)3&gt;·</span><span·class="nf">node</span><span·class="p"·data-group-id="6808984303-5">(</span><span·class="p"·data-group-id="6808984303-5">)</span><span·class="p">.</span><span·class="w">158 (dilbert@uab)3&gt;·</span><span·class="nf">node</span><span·class="p"·data-group-id="5616944362-5">(</span><span·class="p"·data-group-id="5616944362-5">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="ss">dilbert@uab</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>A·node·with·a·long·node·name·cannot·communicate·with·a·node·with·a·short·node159 </span><span·class="ss">dilbert@uab</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>A·node·with·a·long·node·name·cannot·communicate·with·a·node·with·a·short·node
160 name.</p></section><h2·id="node-connections"·class="section-heading">160 name.</p></section><h2·id="node-connections"·class="section-heading">
161 ··<a·href="#node-connections"·class="hover-link">161 ··<a·href="#node-connections"·class="hover-link">
162 ····<i·class="ri-link-m"·aria-hidden="true"></i>162 ····<i·class="ri-link-m"·aria-hidden="true"></i>
163 ··</a>163 ··</a>
164 ··<span·class="text">Node·Connections</span>164 ··<span·class="text">Node·Connections</span>
165 </h2>165 </h2>
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356 ······<p·class="built-using">356 ······<p·class="built-using">
357 ········Built·using357 ········Built·using
358 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the358 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
359 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>359 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
360 ······</p>360 ······</p>
361 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>361 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
362 ····</footer>362 ····</footer>
363 ··</div>363 ··</div>
364 </main>364 </main>
365 </div>365 </div>
366 <script>366 <script>
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368 ····mermaid.initialize({368 ····mermaid.initialize({
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150 (within·the·time-out·specified·by·<code·class="inline">sync_nodes_timeout</code>).</li><li><p><code·class="inline">sync_nodes_timeout·=·integer()·|·infinity</code>·-·Specifies·how·many·milliseconds150 (within·the·time-out·specified·by·<code·class="inline">sync_nodes_timeout</code>).</li><li><p><code·class="inline">sync_nodes_timeout·=·integer()·|·infinity</code>·-·Specifies·how·many·milliseconds
151 to·wait·for·the·other·nodes·to·start.</p></li></ul><p>When·started,·the·node·waits·for·all·nodes·specified·by·<code·class="inline">sync_nodes_mandatory</code>151 to·wait·for·the·other·nodes·to·start.</p></li></ul><p>When·started,·the·node·waits·for·all·nodes·specified·by·<code·class="inline">sync_nodes_mandatory</code>
152 and·<code·class="inline">sync_nodes_optional</code>·to·come·up.·When·all·nodes·are·up,·or·when·all152 and·<code·class="inline">sync_nodes_optional</code>·to·come·up.·When·all·nodes·are·up,·or·when·all
153 mandatory·nodes·are·up·and·the·time·specified·by·<code·class="inline">sync_nodes_timeout</code>·has153 mandatory·nodes·are·up·and·the·time·specified·by·<code·class="inline">sync_nodes_timeout</code>·has
154 elapsed,·all·applications·start.·If·not·all·mandatory·nodes·are·up,·the·node154 elapsed,·all·applications·start.·If·not·all·mandatory·nodes·are·up,·the·node
155 terminates.</p><p><em>Example:</em></p><p>An·application·<code·class="inline">myapp</code>·is·to·run·at·the·node·<code·class="inline">cp1@cave</code>.·If·this·node·goes·down,155 terminates.</p><p><em>Example:</em></p><p>An·application·<code·class="inline">myapp</code>·is·to·run·at·the·node·<code·class="inline">cp1@cave</code>.·If·this·node·goes·down,
156 <code·class="inline">myapp</code>·is·to·be·restarted·at·<code·class="inline">cp2@cave</code>·or·<code·class="inline">cp3@cave</code>.·A·system·configuration156 <code·class="inline">myapp</code>·is·to·be·restarted·at·<code·class="inline">cp2@cave</code>·or·<code·class="inline">cp3@cave</code>.·A·system·configuration
157 file·<code·class="inline">cp1.config</code>·for·<code·class="inline">cp1@cave</code>·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4320876997-1">[</span><span·class="p"·data-group-id="4320876997-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">157 file·<code·class="inline">cp1.config</code>·for·<code·class="inline">cp1@cave</code>·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8651936202-1">[</span><span·class="p"·data-group-id="8651936202-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
158 ··</span><span·class="p"·data-group-id="4320876997-3">[</span><span·class="p"·data-group-id="4320876997-4">{</span><span·class="ss">distributed</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4320876997-5">[</span><span·class="p"·data-group-id="4320876997-6">[·...·truncated·by·diffoscope;·len:·712,·SHA:·ba7ccdcce73bf971daea5f5a111585dc1d49f05d5329ade3a4d126cfca233818·...·]-4">}</span><span·class="p">,</span><span·class="w">158 ··</span><span·class="p"·data-group-id="8651936202-3">[</span><span·class="p"·data-group-id="8651936202-4">{</span><span·class="ss">distributed</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8651936202-5">[</span><span·class="p"·data-group-id="8651936202-6">[·...·truncated·by·diffoscope;·len:·712,·SHA:·5947f7e7193bad57cc3c8f3d329a9438b425337f8df3573fa260b9ee0a464b10·...·]-4">}</span><span·class="p">,</span><span·class="w">
159 ···</span><span·class="p"·data-group-id="4320876997-9">{</span><span·class="ss">sync_nodes_mandatory</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4320876997-10">[</span><span·class="ss">cp2@cave</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·119,·SHA:·a788e2bc4acbcb6d9db308ae96fe6360a45f7d4098382200fa4251738098eb44·...·]-9">}</span><span·class="p">,</span><span·class="w">159 ···</span><span·class="p"·data-group-id="8651936202-9">{</span><span·class="ss">sync_nodes_mandatory</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8651936202-10">[</span><span·class="ss">cp2@cave</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·119,·SHA:·6ff091d8c309f4c3db8dc37df255db8105c9ec5d2a6d621fd39da0546d679f2b·...·]-9">}</span><span·class="p">,</span><span·class="w">
160 ···</span><span·class="p"·data-group-id="4320876997-11">{</span><span·class="ss">sync_nodes_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p"·data-group-id="4320876997-11">}</span><span·class="w">160 ···</span><span·class="p"·data-group-id="8651936202-11">{</span><span·class="ss">sync_nodes_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p"·data-group-id="8651936202-11">}</span><span·class="w">
161 ··</span><span·class="p"·data-group-id="4320876997-3">]</span><span·class="w">161 ··</span><span·class="p"·data-group-id="8651936202-3">]</span><span·class="w">
162 ·</span><span·class="p"·data-group-id="4320876997-2">}</span><span·class="w">162 ·</span><span·class="p"·data-group-id="8651936202-2">}</span><span·class="w">
163 </span><span·class="p"·data-group-id="4320876997-1">]</span><span·class="p">.</span></code></pre><p>The·system·configuration·files·for·<code·class="inline">cp2@cave</code>·and·<code·class="inline">cp3@cave</code>·are·identical,163 </span><span·class="p"·data-group-id="8651936202-1">]</span><span·class="p">.</span></code></pre><p>The·system·configuration·files·for·<code·class="inline">cp2@cave</code>·and·<code·class="inline">cp3@cave</code>·are·identical,
164 except·for·the·list·of·mandatory·nodes,·which·is·to·be·<code·class="inline">[cp1@cave,·cp3@cave]</code>164 except·for·the·list·of·mandatory·nodes,·which·is·to·be·<code·class="inline">[cp1@cave,·cp3@cave]</code>
165 for·<code·class="inline">cp2@cave</code>·and·<code·class="inline">[cp1@cave,·cp2@cave]</code>·for·<code·class="inline">cp3@cave</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>All·involved·nodes·must·have·the·same·value·for·<code·class="inline">distributed</code>·and165 for·<code·class="inline">cp2@cave</code>·and·<code·class="inline">[cp1@cave,·cp2@cave]</code>·for·<code·class="inline">cp3@cave</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>All·involved·nodes·must·have·the·same·value·for·<code·class="inline">distributed</code>·and
166 <code·class="inline">sync_nodes_timeout</code>.·Otherwise·the·system·behavior·is·undefined.</p></section><h2·id="starting-and-stopping-distributed-applications"·class="section-heading">166 <code·class="inline">sync_nodes_timeout</code>.·Otherwise·the·system·behavior·is·undefined.</p></section><h2·id="starting-and-stopping-distributed-applications"·class="section-heading">
167 ··<a·href="#starting-and-stopping-distributed-applications"·class="hover-link">167 ··<a·href="#starting-and-stopping-distributed-applications"·class="hover-link">
168 ····<i·class="ri-link-m"·aria-hidden="true"></i>168 ····<i·class="ri-link-m"·aria-hidden="true"></i>
169 ··</a>169 ··</a>
170 ··<span·class="text">Starting·and·Stopping·Distributed·Applications</span>170 ··<span·class="text">Starting·and·Stopping·Distributed·Applications</span>
171 </h2>171 </h2>
172 <p>When·all·involved·(mandatory)·nodes·have·been·started,·the·distributed172 <p>When·all·involved·(mandatory)·nodes·have·been·started,·the·distributed
173 application·can·be·started·by·calling·<code·class="inline">application:start(Application)</code>·at·<em>all173 application·can·be·started·by·calling·<code·class="inline">application:start(Application)</code>·at·<em>all
174 of·these·nodes.</em></p><p>A·boot·script·(see·<a·href="release_structure.html">Releases</a>)·can·be·used·that174 of·these·nodes.</em></p><p>A·boot·script·(see·<a·href="release_structure.html">Releases</a>)·can·be·used·that
175 automatically·starts·the·application.</p><p>The·application·is·started·at·the·first·operational·node·that·is·listed·in·the175 automatically·starts·the·application.</p><p>The·application·is·started·at·the·first·operational·node·that·is·listed·in·the
176 list·of·nodes·in·the·<code·class="inline">distributed</code>·configuration·parameter.·The·application·is176 list·of·nodes·in·the·<code·class="inline">distributed</code>·configuration·parameter.·The·application·is
177 started·as·usual.·That·is,·an·application·master·is·created·and·calls·the177 started·as·usual.·That·is,·an·application·master·is·created·and·calls·the
178 application·callback·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3847653942-1">(</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="3847653942-1">)</span></code></pre><p>Example:</p><p>Continuing·the·example·from·the·previous·section,·the·three·nodes·are·started,178 application·callback·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9732446182-1">(</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="9732446182-1">)</span></code></pre><p>Example:</p><p>Continuing·the·example·from·the·previous·section,·the·three·nodes·are·started,
179 specifying·the·system·configuration·file:</p><pre><code·class="text">&gt;·erl·-sname·cp1·-config·cp1179 specifying·the·system·configuration·file:</p><pre><code·class="text">&gt;·erl·-sname·cp1·-config·cp1
180 &gt;·erl·-sname·cp2·-config·cp2180 &gt;·erl·-sname·cp2·-config·cp2
181 &gt;·erl·-sname·cp3·-config·cp3</code></pre><p>When·all·nodes·are·operational,·<code·class="inline">myapp</code>·can·be·started.·This·is·achieved·by181 &gt;·erl·-sname·cp3·-config·cp3</code></pre><p>When·all·nodes·are·operational,·<code·class="inline">myapp</code>·can·be·started.·This·is·achieved·by
182 calling·<code·class="inline">application:start(myapp)</code>·at·all·three·nodes.·It·is·then·started·at182 calling·<code·class="inline">application:start(myapp)</code>·at·all·three·nodes.·It·is·then·started·at
183 <code·class="inline">cp1</code>,·as·shown·in·the·following·figure:</p><p><a·href=""·id="dist1"></a></p><p><img·src="assets/dist1.gif"·alt="Application·myapp·-·Situation·1"·title="Application·myapp·-·Situation·1"/></p><p>Similarly,·the·application·must·be·stopped·by·calling183 <code·class="inline">cp1</code>,·as·shown·in·the·following·figure:</p><p><a·href=""·id="dist1"></a></p><p><img·src="assets/dist1.gif"·alt="Application·myapp·-·Situation·1"·title="Application·myapp·-·Situation·1"/></p><p>Similarly,·the·application·must·be·stopped·by·calling
184 <code·class="inline">application:stop(Application)</code>·at·all·involved·nodes.</p><h2·id="failover"·class="section-heading">184 <code·class="inline">application:stop(Application)</code>·at·all·involved·nodes.</p><h2·id="failover"·class="section-heading">
185 ··<a·href="#failover"·class="hover-link">185 ··<a·href="#failover"·class="hover-link">
Offset 187, 30 lines modifiedOffset 187, 30 lines modified
187 ··</a>187 ··</a>
188 ··<span·class="text">Failover</span>188 ··<span·class="text">Failover</span>
189 </h2>189 </h2>
190 <p>If·the·node·where·the·application·is·running·goes·down,·the·application·is190 <p>If·the·node·where·the·application·is·running·goes·down,·the·application·is
191 restarted·(after·the·specified·time-out)·at·the·first·operational·node·that·is191 restarted·(after·the·specified·time-out)·at·the·first·operational·node·that·is
192 listed·in·the·list·of·nodes·in·the·<code·class="inline">distributed</code>·configuration·parameter.·This192 listed·in·the·list·of·nodes·in·the·<code·class="inline">distributed</code>·configuration·parameter.·This
193 is·called·a·<em>failover</em>.</p><p>The·application·is·started·the·normal·way·at·the·new·node,·that·is,·by·the193 is·called·a·<em>failover</em>.</p><p>The·application·is·started·the·normal·way·at·the·new·node,·that·is,·by·the
194 application·master·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6231868007-1">(</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="6231868007-1">)</span></code></pre><p>An·exception·is·if·the·application·has·the·<code·class="inline">start_phases</code>·key·defined·(see194 application·master·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6491988459-1">(</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="6491988459-1">)</span></code></pre><p>An·exception·is·if·the·application·has·the·<code·class="inline">start_phases</code>·key·defined·(see
195 <a·href="included_applications.html">Included·Applications</a>).·The·application·is·then195 <a·href="included_applications.html">Included·Applications</a>).·The·application·is·then
196 instead·started·by·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8534149697-1">(</span><span·class="p"·data-group-id="8534149697-2">{</span><span·class="ss">failover</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="8534149697-2">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·100,·SHA:·873b3b86deeeb6d02b4fabe46e532e3036f1300ef8e15ac23bbed861ea63cae1·...·]-1">)</span></code></pre><p>Here·<code·class="inline">Node</code>·is·the·terminated·node.</p><p><em>Example:</em></p><p>If·<code·class="inline">cp1</code>·goes·down,·the·system·checks·which·one·of·the·other·nodes,·<code·class="inline">cp2</code>·or196 instead·started·by·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1966364466-1">(</span><span·class="p"·data-group-id="1966364466-2">{</span><span·class="ss">failover</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="1966364466-2">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·100,·SHA:·b24b8e1c8cc1f5f912ff687e5e8b979e92e2cbbe65d374eb992f5d333c42176d·...·]-1">)</span></code></pre><p>Here·<code·class="inline">Node</code>·is·the·terminated·node.</p><p><em>Example:</em></p><p>If·<code·class="inline">cp1</code>·goes·down,·the·system·checks·which·one·of·the·other·nodes,·<code·class="inline">cp2</code>·or
197 <code·class="inline">cp3</code>,·has·the·least·number·of·running·applications,·but·waits·for·5·seconds·for197 <code·class="inline">cp3</code>,·has·the·least·number·of·running·applications,·but·waits·for·5·seconds·for
198 <code·class="inline">cp1</code>·to·restart.·If·<code·class="inline">cp1</code>·does·not·restart·and·<code·class="inline">cp2</code>·runs·fewer·applications198 <code·class="inline">cp1</code>·to·restart.·If·<code·class="inline">cp1</code>·does·not·restart·and·<code·class="inline">cp2</code>·runs·fewer·applications
199 than·<code·class="inline">cp3</code>,·<code·class="inline">myapp</code>·is·restarted·on·<code·class="inline">cp2</code>.</p><p><a·href=""·id="dist2"></a></p><p><img·src="assets/dist2.gif"·alt="Application·myapp·-·Situation·2"·title="Application·myapp·-·Situation·2"/></p><p>Suppose·now·that·<code·class="inline">cp2</code>·goes·also·down·and·does·not·restart·within·5·seconds.199 than·<code·class="inline">cp3</code>,·<code·class="inline">myapp</code>·is·restarted·on·<code·class="inline">cp2</code>.</p><p><a·href=""·id="dist2"></a></p><p><img·src="assets/dist2.gif"·alt="Application·myapp·-·Situation·2"·title="Application·myapp·-·Situation·2"/></p><p>Suppose·now·that·<code·class="inline">cp2</code>·goes·also·down·and·does·not·restart·within·5·seconds.
200 <code·class="inline">myapp</code>·is·now·restarted·on·<code·class="inline">cp3</code>.</p><p><a·href=""·id="dist3"></a></p><p><img·src="assets/dist3.gif"·alt="Application·myapp·-·Situation·3"·title="Application·myapp·-·Situation·3"/></p><h2·id="takeover"·class="section-heading">200 <code·class="inline">myapp</code>·is·now·restarted·on·<code·class="inline">cp3</code>.</p><p><a·href=""·id="dist3"></a></p><p><img·src="assets/dist3.gif"·alt="Application·myapp·-·Situation·3"·title="Application·myapp·-·Situation·3"/></p><h2·id="takeover"·class="section-heading">
201 ··<a·href="#takeover"·class="hover-link">201 ··<a·href="#takeover"·class="hover-link">
202 ····<i·class="ri-link-m"·aria-hidden="true"></i>202 ····<i·class="ri-link-m"·aria-hidden="true"></i>
203 ··</a>203 ··</a>
204 ··<span·class="text">Takeover</span>204 ··<span·class="text">Takeover</span>
205 </h2>205 </h2>
206 <p>If·a·node·is·started,·which·has·higher·priority·according·to·<code·class="inline">distributed</code>·than206 <p>If·a·node·is·started,·which·has·higher·priority·according·to·<code·class="inline">distributed</code>·than
207 the·node·where·a·distributed·application·is·running,·the·application·is207 the·node·where·a·distributed·application·is·running,·the·application·is
208 restarted·at·the·new·node·and·stopped·at·the·old·node.·This·is·called·a208 restarted·at·the·new·node·and·stopped·at·the·old·node.·This·is·called·a
209 <em>takeover</em>.</p><p>The·application·is·started·by·the·application·master·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4390496060-1">(</span><span·class="p"·data-group-id="4390496060-2">{</span><span·class="ss">takeover</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="4390496060-2">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·100,·SHA:·5fcb9adf7f9fb3e6204a3076a3ceb2e0e478b0dd6cb01039dbf1f08efe009555·...·]-1">)</span></code></pre><p>Here·<code·class="inline">Node</code>·is·the·old·node.</p><p><em>Example:</em></p><p>If·<code·class="inline">myapp</code>·is·running·at·<code·class="inline">cp3</code>,·and·if·<code·class="inline">cp2</code>·now·restarts,·it·does·not·restart209 <em>takeover</em>.</p><p>The·application·is·started·by·the·application·master·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Module</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6327740423-1">(</span><span·class="p"·data-group-id="6327740423-2">{</span><span·class="ss">takeover</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="6327740423-2">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·100,·SHA:·ab637e2b94836e444e19b5a606837cbe2a3fcba8ac8fd3f16018fbed9b7832d9·...·]-1">)</span></code></pre><p>Here·<code·class="inline">Node</code>·is·the·old·node.</p><p><em>Example:</em></p><p>If·<code·class="inline">myapp</code>·is·running·at·<code·class="inline">cp3</code>,·and·if·<code·class="inline">cp2</code>·now·restarts,·it·does·not·restart
210 <code·class="inline">myapp</code>,·as·the·order·between·the·<code·class="inline">cp2</code>·and·<code·class="inline">cp3</code>·nodes·is·undefined.</p><p><a·href=""·id="dist4"></a></p><p><img·src="assets/dist4.gif"·alt="Application·myapp·-·Situation·4"·title="Application·myapp·-·Situation·4"/></p><p>However,·if·<code·class="inline">cp1</code>·also·restarts,·the·function·<a·href="../../lib/kernel-10.2.6/doc/html/application.html#takeover/2"><code·class="inline">application:takeover/2</code></a>·moves210 <code·class="inline">myapp</code>,·as·the·order·between·the·<code·class="inline">cp2</code>·and·<code·class="inline">cp3</code>·nodes·is·undefined.</p><p><a·href=""·id="dist4"></a></p><p><img·src="assets/dist4.gif"·alt="Application·myapp·-·Situation·4"·title="Application·myapp·-·Situation·4"/></p><p>However,·if·<code·class="inline">cp1</code>·also·restarts,·the·function·<a·href="../../lib/kernel-10.2.6/doc/html/application.html#takeover/2"><code·class="inline">application:takeover/2</code></a>·moves
211 <code·class="inline">myapp</code>·to·<code·class="inline">cp1</code>,·as·<code·class="inline">cp1</code>·has·a·higher·priority·than·<code·class="inline">cp3</code>·for·this211 <code·class="inline">myapp</code>·to·<code·class="inline">cp1</code>,·as·<code·class="inline">cp1</code>·has·a·higher·priority·than·<code·class="inline">cp3</code>·for·this
212 application.·In·this·case,·<code·class="inline">Module:start({takeover,·cp3@cave},·StartArgs)</code>·is212 application.·In·this·case,·<code·class="inline">Module:start({takeover,·cp3@cave},·StartArgs)</code>·is
213 executed·at·<code·class="inline">cp1</code>·to·start·the·application.</p><p><a·href=""·id="dist5"></a></p><p><img·src="assets/dist5.gif"·alt="Application·myapp·-·Situation·5"·title="Application·myapp·-·Situation·5"/></p>213 executed·at·<code·class="inline">cp1</code>·to·start·the·application.</p><p><a·href=""·id="dist5"></a></p><p><img·src="assets/dist5.gif"·alt="Application·myapp·-·Situation·5"·title="Application·myapp·-·Situation·5"/></p>
214 </div>214 </div>
  
215 <div·class="bottom-actions"·id="bottom-actions">215 <div·class="bottom-actions"·id="bottom-actions">
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257 ······<p·class="built-using">257 ······<p·class="built-using">
258 ········Built·using258 ········Built·using
259 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the259 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
260 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>260 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
261 ······</p>261 ······</p>
262 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>262 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
263 ····</footer>263 ····</footer>
264 ··</div>264 ··</div>
265 </main>265 </main>
266 </div>266 </div>
267 <script>267 <script>
268 ··function·mermaidLoaded()·{268 ··function·mermaidLoaded()·{
269 ····mermaid.initialize({269 ····mermaid.initialize({
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112 ······</a>112 ······</a>
  
  
113 ····<span>Documentation</span>113 ····<span>Documentation</span>
114 ··</h1>114 ··</h1>
  
115 <p>Documentation·in·Erlang·is·done·through·the·<code·class="inline">-moduledoc</code>·and·<code·class="inline">-doc</code>115 <p>Documentation·in·Erlang·is·done·through·the·<code·class="inline">-moduledoc</code>·and·<code·class="inline">-doc</code>
116 <a·href="modules.html#module-attributes">attributes</a>.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3616984913-1">(</span><span·class="ss">arith</span><span·class="p"·data-group-id="3616984913-1">)</span><span·class="p">.</span><span·class="w">116 <a·href="modules.html#module-attributes">attributes</a>.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2552800618-1">(</span><span·class="ss">arith</span><span·class="p"·data-group-id="2552800618-1">)</span><span·class="p">.</span><span·class="w">
117 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;117 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;
118 A·module·for·basic·arithmetic.118 A·module·for·basic·arithmetic.
119 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">119 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">
120 </span><span·class="w">120 </span><span·class="w">
121 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3616984913-2">(</span><span·class="p"·data-group-id="3616984913-3">[</span><span·class="ss">add</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="3616984913-3">]</span><span·class="p"·data-group-id="3616984913-2">)</span><span·class="p">.</span><span·class="w">121 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2552800618-2">(</span><span·class="p"·data-group-id="2552800618-3">[</span><span·class="ss">add</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="2552800618-3">]</span><span·class="p"·data-group-id="2552800618-2">)</span><span·class="p">.</span><span·class="w">
122 </span><span·class="w">122 </span><span·class="w">
123 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;Adds·two·numbers.&quot;</span><span·class="p">.</span><span·class="w">123 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;Adds·two·numbers.&quot;</span><span·class="p">.</span><span·class="w">
124 </span><span·class="nf">add</span><span·class="p"·data-group-id="3616984913-4">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="3616984913-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">-moduledoc</code>·attribute·has·to·be·located·before·the·first·<code·class="inline">-doc</code>·attribute124 </span><span·class="nf">add</span><span·class="p"·data-group-id="2552800618-4">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="2552800618-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">-moduledoc</code>·attribute·has·to·be·located·before·the·first·<code·class="inline">-doc</code>·attribute
125 or·function·declaration.·It·documents·the·overall·purpose·of·the·module.</p><p>The·<code·class="inline">-doc</code>·attribute·always·precedes·the·<a·href="ref_man_functions.html">function</a>·or125 or·function·declaration.·It·documents·the·overall·purpose·of·the·module.</p><p>The·<code·class="inline">-doc</code>·attribute·always·precedes·the·<a·href="ref_man_functions.html">function</a>·or
126 <a·href="modules.html#module-attributes">attribute</a>·it·documents.·The126 <a·href="modules.html#module-attributes">attribute</a>·it·documents.·The
127 attributes·that·can·be·documented·are127 attributes·that·can·be·documented·are
128 <a·href="typespec.html#type-declarations-of-user-defined-types">user-defined·types</a>128 <a·href="typespec.html#type-declarations-of-user-defined-types">user-defined·types</a>
129 (<code·class="inline">-type</code>·and·<code·class="inline">-opaque</code>)·and129 (<code·class="inline">-type</code>·and·<code·class="inline">-opaque</code>)·and
130 <a·href="modules.html#behaviour-module-attribute">behaviour·module·attributes</a>130 <a·href="modules.html#behaviour-module-attribute">behaviour·module·attributes</a>
131 (<code·class="inline">-callback</code>).</p><p>By·default·the·format·used·for·documentation·attributes·is131 (<code·class="inline">-callback</code>).</p><p>By·default·the·format·used·for·documentation·attributes·is
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140 <a·href="modules.html#documentation-attributes">Documentation·Attributes</a>.</p><p><code·class="inline">-doc</code>·attributes·have·been·available·since·Erlang/OTP·27.</p><h2·id="documentation-metadata"·class="section-heading">140 <a·href="modules.html#documentation-attributes">Documentation·Attributes</a>.</p><p><code·class="inline">-doc</code>·attributes·have·been·available·since·Erlang/OTP·27.</p><h2·id="documentation-metadata"·class="section-heading">
141 ··<a·href="#documentation-metadata"·class="hover-link">141 ··<a·href="#documentation-metadata"·class="hover-link">
142 ····<i·class="ri-link-m"·aria-hidden="true"></i>142 ····<i·class="ri-link-m"·aria-hidden="true"></i>
143 ··</a>143 ··</a>
144 ··<span·class="text">Documentation·metadata</span>144 ··<span·class="text">Documentation·metadata</span>
145 </h2>145 </h2>
146 <p>It·is·possible·to·add·metadata·to·the·documentation·entry.·You·do·this·by·adding146 <p>It·is·possible·to·add·metadata·to·the·documentation·entry.·You·do·this·by·adding
147 a·<code·class="inline">-moduledoc</code>·or·<code·class="inline">-doc</code>·attribute·with·a·map·as·argument.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8375398937-1">(</span><span·class="ss">arith</span><span·class="p"·data-group-id="8375398937-1">)</span><span·class="p">.</span><span·class="w">147 a·<code·class="inline">-moduledoc</code>·or·<code·class="inline">-doc</code>·attribute·with·a·map·as·argument.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8078985131-1">(</span><span·class="ss">arith</span><span·class="p"·data-group-id="8078985131-1">)</span><span·class="p">.</span><span·class="w">
148 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;148 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;
149 A·module·for·basic·arithmetic.149 A·module·for·basic·arithmetic.
150 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">150 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">
151 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="8375398937-2">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p"·data-group-id="8375398937-2">}</span><span·class="p">.</span><span·class="w">151 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="8078985131-2">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p"·data-group-id="8078985131-2">}</span><span·class="p">.</span><span·class="w">
152 </span><span·class="w">152 </span><span·class="w">
153 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8375398937-3">(</span><span·class="p"·data-group-id="8375398937-4">[</span><span·class="ss">add</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="8375398937-4">]</span><span·class="p"·data-group-id="8375398937-3">)</span><span·class="p">.</span><span·class="w">153 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8078985131-3">(</span><span·class="p"·data-group-id="8078985131-4">[</span><span·class="ss">add</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="8078985131-4">]</span><span·class="p"·data-group-id="8078985131-3">)</span><span·class="p">.</span><span·class="w">
154 </span><span·class="w">154 </span><span·class="w">
155 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;Adds·two·numbers.&quot;</span><span·class="p">.</span><span·class="w">155 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;Adds·two·numbers.&quot;</span><span·class="p">.</span><span·class="w">
156 </span><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="8375398937-5">(</span><span·class="p"·data-group-id="8375398937-6">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p"·data-group-id="8375398[·...·truncated·by·diffoscope;·len:·56,·SHA:·84015a8166abec65b752362fb26d6396db666142deae2308bb2cf9a79b285902·...·]-5">)</span><span·class="p">.</span><span·class="w">156 </span><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="8078985131-5">(</span><span·class="p"·data-group-id="8078985131-6">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p"·data-group-id="8078985[·...·truncated·by·diffoscope;·len:·56,·SHA:·1bf969334e6a5879c6a9e2b9f844c92c8372da448f2ef6a64fc757880f8f4515·...·]-5">)</span><span·class="p">.</span><span·class="w">
157 </span><span·class="nf">add</span><span·class="p"·data-group-id="8375398937-7">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="8375398937-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><p>The·metadata·is·used·by·documentation·tools·to·provide·extra·information·to·the157 </span><span·class="nf">add</span><span·class="p"·data-group-id="8078985131-7">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="8078985131-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><p>The·metadata·is·used·by·documentation·tools·to·provide·extra·information·to·the
158 user.·There·can·be·multiple·metadata·documentation·entries,·in·which·case·the158 user.·There·can·be·multiple·metadata·documentation·entries,·in·which·case·the
159 maps·will·be·merged·with·the·latest·taking·precedence·if·there·are·duplicate159 maps·will·be·merged·with·the·latest·taking·precedence·if·there·are·duplicate
160 keys.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;Adds·two·numbers.&quot;</span><span·class="p">.</span><span·class="w">160 keys.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;Adds·two·numbers.&quot;</span><span·class="p">.</span><span·class="w">
161 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="p"·data-group-id="1199439917-1">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">author</span><span·class=[·...·truncated·by·diffoscope;·len:·143,·SHA:·2f90fedc99d47e3498d981af2df5e285c37f2ea71b8564f595937237db0dcf25·...·]-1">}</span><span·class="p">.</span><span·class="w">161 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="p"·data-group-id="6589194204-1">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;1.0&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">author</span><span·class=[·...·truncated·by·diffoscope;·len:·143,·SHA:·c3a4757a9440d6515c25c21dc59238be924de30328328aa78017e481dfb5d1aa·...·]-1">}</span><span·class="p">.</span><span·class="w">
162 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="p"·data-group-id="1199439917-2">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;2.0&quot;</span><span·class="p"·data-group-id="1199439917-2">}</span><span·class="p">.</span><span·class="w">162 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="p"·data-group-id="6589194204-2">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;2.0&quot;</span><span·class="p"·data-group-id="6589194204-2">}</span><span·class="p">.</span><span·class="w">
163 </span><span·class="nf">add</span><span·class="p"·data-group-id="1199439917-3">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="1199439917-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><p>This·will·result·in·a·metadata·entry·of·<code·class="inline">#{since·=&gt;·&quot;2.0&quot;,·author·=&gt;·&quot;Joe&quot;}</code>.</p><p>The·keys·and·values·in·the·metadata·map·can·be·any·type,·but·it·is·recommended163 </span><span·class="nf">add</span><span·class="p"·data-group-id="6589194204-3">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="6589194204-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><p>This·will·result·in·a·metadata·entry·of·<code·class="inline">#{since·=&gt;·&quot;2.0&quot;,·author·=&gt;·&quot;Joe&quot;}</code>.</p><p>The·keys·and·values·in·the·metadata·map·can·be·any·type,·but·it·is·recommended
164 that·only·<a·href="data_types.html#atom">atoms</a>·are·used·for·keys·and164 that·only·<a·href="data_types.html#atom">atoms</a>·are·used·for·keys·and
165 <a·href="data_types.html#string">strings</a>·for·the·values.</p><h2·id="external-documentation-files"·class="section-heading">165 <a·href="data_types.html#string">strings</a>·for·the·values.</p><h2·id="external-documentation-files"·class="section-heading">
166 ··<a·href="#external-documentation-files"·class="hover-link">166 ··<a·href="#external-documentation-files"·class="hover-link">
167 ····<i·class="ri-link-m"·aria-hidden="true"></i>167 ····<i·class="ri-link-m"·aria-hidden="true"></i>
168 ··</a>168 ··</a>
169 ··<span·class="text">External·documentation·files</span>169 ··<span·class="text">External·documentation·files</span>
170 </h2>170 </h2>
171 <p>The·<code·class="inline">-moduledoc</code>·and·<code·class="inline">-doc</code>·can·also·be·placed·in·external·files.·To·do·so·use171 <p>The·<code·class="inline">-moduledoc</code>·and·<code·class="inline">-doc</code>·can·also·be·placed·in·external·files.·To·do·so·use
172 <code·class="inline">-doc·{file,·&quot;path/to/doc.md&quot;}</code>·to·point·to·the·documentation.·The·path·used·is172 <code·class="inline">-doc·{file,·&quot;path/to/doc.md&quot;}</code>·to·point·to·the·documentation.·The·path·used·is
173 relative·to·the·file·where·the·<code·class="inline">-doc</code>·attribute·is·located.·For·example:</p><pre><code·class="markdown">%%·doc/add.md173 relative·to·the·file·where·the·<code·class="inline">-doc</code>·attribute·is·located.·For·example:</p><pre><code·class="markdown">%%·doc/add.md
174 Adds·two·numbers.</code></pre><p>and</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·src/arith.erl</span><span·class="w">174 Adds·two·numbers.</code></pre><p>and</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·src/arith.erl</span><span·class="w">
175 </span><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="2876578821-1">(</span><span·class="p"·data-group-id="2876578821-2">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;../doc/add.md&quot;</span><span·class="p"·data-group-id="2876578821-2">}</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·8a3ce8faed13cd623cd16e53fa11461851268425ee8a252061eb1b8c36736ce1·...·]-1">)</span><span·class="p">.</span><span·class="w">175 </span><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="8879666686-1">(</span><span·class="p"·data-group-id="8879666686-2">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;../doc/add.md&quot;</span><span·class="p"·data-group-id="8879666686-2">}</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·5734f99b372ca5f732f777c08ee488c1a387c9de7906510ffa66baac92fdbfe7·...·]-1">)</span><span·class="p">.</span><span·class="w">
176 </span><span·class="nf">add</span><span·class="p"·data-group-id="2876578821-3">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="2876578821-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><h2·id="documenting-a-module"·class="section-heading">176 </span><span·class="nf">add</span><span·class="p"·data-group-id="8879666686-3">(</span><span·class="n">One</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Two</span><span·class="p"·data-group-id="8879666686-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">One</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Two</span><span·class="p">.</span></code></pre><h2·id="documenting-a-module"·class="section-heading">
177 ··<a·href="#documenting-a-module"·class="hover-link">177 ··<a·href="#documenting-a-module"·class="hover-link">
178 ····<i·class="ri-link-m"·aria-hidden="true"></i>178 ····<i·class="ri-link-m"·aria-hidden="true"></i>
179 ··</a>179 ··</a>
180 ··<span·class="text">Documenting·a·module</span>180 ··<span·class="text">Documenting·a·module</span>
181 </h2>181 </h2>
182 <p>The·module·description·should·include·details·on·how·to·use·the·API·and·examples182 <p>The·module·description·should·include·details·on·how·to·use·the·API·and·examples
183 of·the·different·functions·working·together.·Here·is·a·good·place·to·use·images183 of·the·different·functions·working·together.·Here·is·a·good·place·to·use·images
184 and·other·diagrams·to·better·show·the·usage·of·the·module.·Instead·of·writing·a184 and·other·diagrams·to·better·show·the·usage·of·the·module.·Instead·of·writing·a
185 long·text·in·the·<code·class="inline">moduledoc</code>·attribute,·it·could·be·better·to·break·it·out·into185 long·text·in·the·<code·class="inline">moduledoc</code>·attribute,·it·could·be·better·to·break·it·out·into
186 an·external·page.</p><p>The·<code·class="inline">moduledoc</code>·attribute·should·start·with·a·short·paragraph·describing·the186 an·external·page.</p><p>The·<code·class="inline">moduledoc</code>·attribute·should·start·with·a·short·paragraph·describing·the
187 module·and·then·go·into·greater·details.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2984740540-1">(</span><span·class="ss">arith</span><span·class="p"·data-group-id="2984740540-1">)</span><span·class="p">.</span><span·class="w">187 module·and·then·go·into·greater·details.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4902817073-1">(</span><span·class="ss">arith</span><span·class="p"·data-group-id="4902817073-1">)</span><span·class="p">.</span><span·class="w">
188 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;188 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;
189 ···A·module·for·basic·arithmetic.189 ···A·module·for·basic·arithmetic.
  
190 ···This·module·can·be·used·to·add·and·subtract·values.·For·example:190 ···This·module·can·be·used·to·add·and·subtract·values.·For·example:
  
191 ···```erlang191 ···```erlang
192 ···1&gt;·arith:substract(arith:add(2,·3),·1).192 ···1&gt;·arith:substract(arith:add(2,·3),·1).
Offset 203, 94 lines modifiedOffset 203, 94 lines modified
203 <p>There·are·three·reserved·metadata·keys·for·<code·class="inline">-moduledoc</code>:</p><ul><li><code·class="inline">since</code>·-·Shows·in·which·version·of·the·application·the·module·was·added.203 <p>There·are·three·reserved·metadata·keys·for·<code·class="inline">-moduledoc</code>:</p><ul><li><code·class="inline">since</code>·-·Shows·in·which·version·of·the·application·the·module·was·added.
204 If·this·is·added,·all·functions,·types,·and·callbacks·within·will·also·receive204 If·this·is·added,·all·functions,·types,·and·callbacks·within·will·also·receive
205 the·same·<code·class="inline">since</code>·value·unless·specified·in·the·metadata·of·the·function,·type205 the·same·<code·class="inline">since</code>·value·unless·specified·in·the·metadata·of·the·function,·type
206 or·callback.</li><li><code·class="inline">deprecated</code>·-·Shows·a·text·in·the·documentation·explaining·that·it·is206 or·callback.</li><li><code·class="inline">deprecated</code>·-·Shows·a·text·in·the·documentation·explaining·that·it·is
207 deprecated·and·what·to·use·instead.</li><li><code·class="inline">format</code>·-·The·format·to·use·for·all·documentation·in·this·module.·The207 deprecated·and·what·to·use·instead.</li><li><code·class="inline">format</code>·-·The·format·to·use·for·all·documentation·in·this·module.·The
208 default·is·<code·class="inline">text/markdown</code>.·It·should·be·written·using·the208 default·is·<code·class="inline">text/markdown</code>.·It·should·be·written·using·the
209 <a·href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types">mime·type</a>209 <a·href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types">mime·type</a>
210 of·the·format.</li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="4704471490-1">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;../doc/arith.asciidoc&quot;</span><span·class="p"·data-group-id="4704471490-1">}</span><span·class="p">.</span><span·class="w">210 of·the·format.</li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="7576324356-1">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;../doc/arith.asciidoc&quot;</span><span·class="p"·data-group-id="7576324356-1">}</span><span·class="p">.</span><span·class="w">
211 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="4704471490-2">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;0.1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">format</span><span·class=[·...·truncated·by·diffoscope;·len:·153,·SHA:·4089c0d5468c6584e98f45344104ea1dd3f256d873f8b388320b14e84d42034f·...·]-2">}</span><span·class="p">.</span><span·class="w">211 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="7576324356-2">#{</span><span·class="ss">since</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;0.1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">format</span><span·class=[·...·truncated·by·diffoscope;·len:·153,·SHA:·61920009ca04462e979db7e51f385e4104ce3d4ba7a41dd3697c05d93c1445a3·...·]-2">}</span><span·class="p">.</span><span·class="w">
212 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="4704471490-3">#{</span><span·class="ss">deprecated</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;Use·the·Erlang·arithmetic·operators·instead.&quot;</span><span·class="p"·data-group-id="4704471490-3">}</span><span·class="p">.</span></code></pre><h2·id="documenting-functions-user-defined-types-and-callbacks"·class="section-heading">212 </span><span·class="p">-</span><span·class="na">moduledoc</span><span·class="w">·</span><span·class="p"·data-group-id="7576324356-3">#{</span><span·class="ss">deprecated</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;Use·the·Erlang·arithmetic·operators·instead.&quot;</span><span·class="p"·data-group-id="7576324356-3">}</span><span·class="p">.</span></code></pre><h2·id="documenting-functions-user-defined-types-and-callbacks"·class="section-heading">
213 ··<a·href="#documenting-functions-user-defined-types-and-callbacks"·class="hover-link">213 ··<a·href="#documenting-functions-user-defined-types-and-callbacks"·class="hover-link">
214 ····<i·class="ri-link-m"·aria-hidden="true"></i>214 ····<i·class="ri-link-m"·aria-hidden="true"></i>
215 ··</a>215 ··</a>
216 ··<span·class="text">Documenting·functions,·user-defined·types,·and·callbacks</span>216 ··<span·class="text">Documenting·functions,·user-defined·types,·and·callbacks</span>
217 </h2>217 </h2>
218 <p>Functions,·types,·and·callbacks·can·be·documented·using·the·<code·class="inline">-doc</code>·attribute.218 <p>Functions,·types,·and·callbacks·can·be·documented·using·the·<code·class="inline">-doc</code>·attribute.
219 Each·entry·should·start·with·a·short·paragraph·describing·the·purpose·of·entity,219 Each·entry·should·start·with·a·short·paragraph·describing·the·purpose·of·entity,
220 and·then·go·into·greater·detail·in·needed.</p><p>It·is·not·recommended·to·include·images·or·diagrams·in·this·documentation·as·it220 and·then·go·into·greater·detail·in·needed.</p><p>It·is·not·recommended·to·include·images·or·diagrams·in·this·documentation·as·it
221 is·used·by·IDEs·and·<a·href="../../lib/stdlib-6.2.2/doc/html/c.html#h/1"><code·class="inline">c:h/1</code></a>·to·show·the·documentation·to·the·user.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;221 is·used·by·IDEs·and·<a·href="../../lib/stdlib-6.2.2/doc/html/c.html#h/1"><code·class="inline">c:h/1</code></a>·to·show·the·documentation·to·the·user.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;
222 A·number·that·can·be·used·by·the·arith·module.222 A·number·that·can·be·used·by·the·arith·module.
  
223 We·use·a·special·number·here·so·that·we·know223 We·use·a·special·number·here·so·that·we·know
224 that·this·number·comes·from·this·module.224 that·this·number·comes·from·this·module.
225 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">225 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">
226 </span><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">number</span><span·class="p"·data-group-id="1224641298-1">(</span><span·class="p"·data-group-id="1224641298-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1224641298-2">{</span><span·class="ss">arith</span><sp[·...·truncated·by·diffoscope;·len:·276,·SHA:·adff45650015aadf358ef41478d82ffb3dcc7eedb31bffaf8e40d99fc7e8a2bc·...·]-2">}</span><span·class="p">.</span><span·class="w">226 </span><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">number</span><span·class="p"·data-group-id="3480891975-1">(</span><span·class="p"·data-group-id="3480891975-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="3480891975-2">{</span><span·class="ss">arith</span><sp[·...·truncated·by·diffoscope;·len:·276,·SHA:·e224a8fa5ad5871c8608fd9f8bb18f308759ca2a7b5a03cada391c7b2c8b2e1a·...·]-2">}</span><span·class="p">.</span><span·class="w">
227 </span><span·class="w">227 </span><span·class="w">
228 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;228 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;&quot;&quot;
229 Adds·two·numbers.229 Adds·two·numbers.
  
230 ###·Example:230 ###·Example:
  
231 ```231 ```
232 1&gt;·arith:add(arith:number(1),·arith:number(2)).·{number,·3}232 1&gt;·arith:add(arith:number(1),·arith:number(2)).·{number,·3}
233 ```233 ```
234 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">234 &quot;&quot;&quot;</span><span·class="p">.</span><span·class="w">
235 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">add</span><span·class="p"·data-group-id="1224641298-4">(</span><span·class="nf">number</span><span·class="p"·data-group-id="1224641298-5">(</span><span·class="p"·data-group-id="1224641298-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">number</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·339,·SHA:·19a109a324b5d2f26d405dbc1853fd0301065e6583ad5ba0578db92f1c839975·...·]-7">)</span><span·class="p">.</span><span·class="w">235 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">add</span><span·class="p"·data-group-id="3480891975-4">(</span><span·class="nf">number</span><span·class="p"·data-group-id="3480891975-5">(</span><span·class="p"·data-group-id="3480891975-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">number</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·339,·SHA:·e015d6629e509d0b83dbd1667958cbbd946576e3e3d4ff7f4d9d63f9eff0c834·...·]-7">)</span><span·class="p">.</span><span·class="w">
236 </span><span·class="nf">add</span><span·class="p"·data-group-id="1224641298-8">(</span><span·class="p"·data-group-id="1224641298-9">{</span><span·class="ss">number</span><span·class="p">,</span><span·class="w">·</span><span·class="n">One</span><span·class="p"·data-group-id="1224641298-9">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·662,·SHA:·5368f73eeb93138a5ef35704113d1e989473eb8b2df9e58da82c3567fa87d150·...·]-11">}</span><span·class="p">.</span></code></pre><h3·id="doc-metadata"·class="section-heading">236 </span><span·class="nf">add</span><span·class="p"·data-group-id="3480891975-8">(</span><span·class="p"·data-group-id="3480891975-9">{</span><span·class="ss">number</span><span·class="p">,</span><span·class="w">·</span><span·class="n">One</span><span·class="p"·data-group-id="3480891975-9">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·662,·SHA:·7b9fce0edb28510ae268981d862df3996bb74a54007ff4d6f3720cb6d8d09801·...·]-11">}</span><span·class="p">.</span></code></pre><h3·id="doc-metadata"·class="section-heading">
237 ··<a·href="#doc-metadata"·class="hover-link">237 ··<a·href="#doc-metadata"·class="hover-link">
238 ····<i·class="ri-link-m"·aria-hidden="true"></i>238 ····<i·class="ri-link-m"·aria-hidden="true"></i>
239 ··</a>239 ··</a>
240 ··<span·class="text">Doc·metadata</span>240 ··<span·class="text">Doc·metadata</span>
241 </h3>241 </h3>
242 <p>There·are·four·reserved·metadata·keys·for·<code·class="inline">-doc</code>:</p><ul><li><p><code·class="inline">since·=&gt;·unicode:chardata()</code>·-·Shows·which·version·of·the·application·the242 <p>There·are·four·reserved·metadata·keys·for·<code·class="inline">-doc</code>:</p><ul><li><p><code·class="inline">since·=&gt;·unicode:chardata()</code>·-·Shows·which·version·of·the·application·the
243 module·was·added.</p></li><li><p><code·class="inline">deprecated·=&gt;·unicode:chardata()</code>·-·Shows·a·text·in·the·documentation243 module·was·added.</p></li><li><p><code·class="inline">deprecated·=&gt;·unicode:chardata()</code>·-·Shows·a·text·in·the·documentation
244 explaining·that·it·is·deprecated·and·what·to·use·instead.·The·compiler·will244 explaining·that·it·is·deprecated·and·what·to·use·instead.·The·compiler·will
245 automatically·insert·this·key·if·there·is·a·<code·class="inline">-deprecated</code>·attribute·marking·a245 automatically·insert·this·key·if·there·is·a·<code·class="inline">-deprecated</code>·attribute·marking·a
246 function·as·deprecated.</p></li><li><p><code·class="inline">equiv·=&gt;·unicode:chardata()·|·F/A·|·F(...)</code>·-·Notes·that·this·function·is·equivalent·to246 function·as·deprecated.</p></li><li><p><code·class="inline">equiv·=&gt;·unicode:chardata()·|·F/A·|·F(...)</code>·-·Notes·that·this·function·is·equivalent·to
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122 ··<span·class="text">Drivers·and·Concurrency</span>122 ··<span·class="text">Drivers·and·Concurrency</span>
123 </h2>123 </h2>
124 <p>The·runtime·system·always·takes·a·lock·before·running·any·code·in·a·driver.</p><p>By·default,·that·lock·is·at·the·driver·level,·that·is,·if·several·ports·have124 <p>The·runtime·system·always·takes·a·lock·before·running·any·code·in·a·driver.</p><p>By·default,·that·lock·is·at·the·driver·level,·that·is,·if·several·ports·have
125 been·opened·to·the·same·driver,·only·code·for·one·port·at·the·same·time·can·be125 been·opened·to·the·same·driver,·only·code·for·one·port·at·the·same·time·can·be
126 running.</p><p>A·driver·can·be·configured·to·have·one·lock·for·each·port·instead.</p><p>If·a·driver·is·used·in·a·functional·way·(that·is,·holds·no·state,·but·only·does126 running.</p><p>A·driver·can·be·configured·to·have·one·lock·for·each·port·instead.</p><p>If·a·driver·is·used·in·a·functional·way·(that·is,·holds·no·state,·but·only·does
127 some·heavy·calculation·and·returns·a·result),·several·ports·with·registered127 some·heavy·calculation·and·returns·a·result),·several·ports·with·registered
128 names·can·be·opened·beforehand,·and·the·port·to·be·used·can·be·chosen·based·on128 names·can·be·opened·beforehand,·and·the·port·to·be·used·can·be·chosen·based·on
129 the·scheduler·ID·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7840425336-1">(</span><span·class="n">PORT_NAMES</span><span·class="p"·data-group-id="7840425336-2">(</span><span·class="p"·data-group-id="7840425336-2">)</span><span·class="p">,</span><span·class="w">129 the·scheduler·ID·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="6534355932-1">(</span><span·class="n">PORT_NAMES</span><span·class="p"·data-group-id="6534355932-2">(</span><span·class="p"·data-group-id="6534355932-2">)</span><span·class="p">,</span><span·class="w">
130 »       </span><span·class="p"·data-group-id="7840425336-3">{</span><span·class="ss">some_driver_01</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_02</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_03</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_04</span><span·class="p">,</span><span·class="w">130 »       </span><span·class="p"·data-group-id="6534355932-3">{</span><span·class="ss">some_driver_01</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_02</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_03</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_04</span><span·class="p">,</span><span·class="w">
131 »       ·</span><span·class="ss">some_driver_05</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_06</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_07</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_08</span><span·class="p">,</span><span·class="w">131 »       ·</span><span·class="ss">some_driver_05</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_06</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_07</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_08</span><span·class="p">,</span><span·class="w">
132 »       ·</span><span·class="ss">some_driver_09</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_10</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_11</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_12</span><span·class="p">,</span><span·class="w">132 »       ·</span><span·class="ss">some_driver_09</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_10</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_11</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_12</span><span·class="p">,</span><span·class="w">
133 »       ·</span><span·class="ss">some_driver_13</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_14</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_15</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_16</span><span·class="p"·data-group-id="7840425336-3">}</span><span·class="p"·data-group-id="7840425336-1">)</span><span·class="p">.</span><span·class="w">133 »       ·</span><span·class="ss">some_driver_13</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_14</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_15</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">some_driver_16</span><span·class="p"·data-group-id="6534355932-3">}</span><span·class="p"·data-group-id="6534355932-1">)</span><span·class="p">.</span><span·class="w">
  
134 </span><span·class="nf">client_port</span><span·class="p"·data-group-id="7840425336-4">(</span><span·class="p"·data-group-id="7840425336-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">134 </span><span·class="nf">client_port</span><span·class="p"·data-group-id="6534355932-4">(</span><span·class="p"·data-group-id="6534355932-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
135 ····</span><span·class="nf">element</span><span·class="p"·data-group-id="7840425336-5">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="7840425336-6">(</span><span·class="ss">scheduler_id</span><span·class="p"·data-group-id="7840425336-6">)</span><span·class="w">·</span><span·class="ow">rem</span><span·class="w">·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="7840425336-7">(</span><span·class="o">?</span><span·class="n">PORT_NAMES</span><span·class="p"·data-group-id="7840425336-8">(</span><span·class="p"·data-group-id="7840425336-8">)</span><span·class="p"·data-group-id="7840425336-7">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w"> 
136 »       ····</span><span·class="o">?</span><span·class="n">PORT_NAMES</span><span·class="p"·data-group-id="7840425336-9">(</span><span·class="p"·data-group-id="7840425336-9">)</span><span·class="p"·data-group-id="7840425336-5">)</span><span·class="p">.</span></co[·...·truncated·by·diffoscope;·len:·89,·SHA:·aa315350b3c5d458adacb1d650a0680f6599dab7560522cff5dacd05f86c84c5·...·]135 ····</span><span·class="nf">element</span><span·class="p"·data-group-id="6534355932-5">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="6534355932-6">(</span><span·class="ss">sc[·...·truncated·by·diffoscope;·len:·585,·SHA:·7b59d8a4fc12e4d13138ac9cf88352616a115d592d0d77350a994c2c811a1dfa·...·]
 136 »       ····</span><span·class="o">?</span><span·class="n">PORT_NAMES</span><span·class="p"·data-group-id="6534355932-9">(</span><span·class="p"·data-group-id="6534355932-9">)</span><span·class="p"·data-group-id="6534355932-5">)</span><span·class="p">.</span></code></pre><p>As·long·as·there·are·no·more·than·16·schedulers,·there·will·never·be·any·lock
137 contention·on·the·port·lock·for·the·driver.</p><h2·id="avoiding-copying-binaries-when-calling-a-driver"·class="section-heading">137 contention·on·the·port·lock·for·the·driver.</p><h2·id="avoiding-copying-binaries-when-calling-a-driver"·class="section-heading">
138 ··<a·href="#avoiding-copying-binaries-when-calling-a-driver"·class="hover-link">138 ··<a·href="#avoiding-copying-binaries-when-calling-a-driver"·class="hover-link">
139 ····<i·class="ri-link-m"·aria-hidden="true"></i>139 ····<i·class="ri-link-m"·aria-hidden="true"></i>
140 ··</a>140 ··</a>
141 ··<span·class="text">Avoiding·Copying·Binaries·When·Calling·a·Driver</span>141 ··<span·class="text">Avoiding·Copying·Binaries·When·Calling·a·Driver</span>
142 </h2>142 </h2>
143 <p>There·are·basically·two·ways·to·avoid·copying·a·binary·that·is·sent·to·a·driver:</p><ul><li><p>If·the·<code·class="inline">Data</code>·argument·for·<a·href="../../erts-15.2.6/doc/html/erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>·is·a143 <p>There·are·basically·two·ways·to·avoid·copying·a·binary·that·is·sent·to·a·driver:</p><ul><li><p>If·the·<code·class="inline">Data</code>·argument·for·<a·href="../../erts-15.2.6/doc/html/erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>·is·a
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225 ······<p·class="built-using">225 ······<p·class="built-using">
226 ········Built·using226 ········Built·using
227 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the227 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
228 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>228 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
229 ······</p>229 ······</p>
230 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>230 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
231 ····</footer>231 ····</footer>
232 ··</div>232 ··</div>
233 </main>233 </main>
234 </div>234 </div>
235 <script>235 <script>
236 ··function·mermaidLoaded()·{236 ··function·mermaidLoaded()·{
237 ····mermaid.initialize({237 ····mermaid.initialize({
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122 ··<span·class="text">Pattern·Matching</span>122 ··<span·class="text">Pattern·Matching</span>
123 </h2>123 </h2>
124 <p>Pattern·matching·in·function·head·as·well·as·in·<code·class="inline">case</code>·and·<code·class="inline">receive</code>·clauses·are124 <p>Pattern·matching·in·function·head·as·well·as·in·<code·class="inline">case</code>·and·<code·class="inline">receive</code>·clauses·are
125 optimized·by·the·compiler.·With·a·few·exceptions,·there·is·nothing·to·gain·by125 optimized·by·the·compiler.·With·a·few·exceptions,·there·is·nothing·to·gain·by
126 rearranging·clauses.</p><p>One·exception·is·pattern·matching·of·binaries.·The·compiler·does·not·rearrange126 rearranging·clauses.</p><p>One·exception·is·pattern·matching·of·binaries.·The·compiler·does·not·rearrange
127 clauses·that·match·binaries.·Placing·the·clause·that·matches·against·the·empty127 clauses·that·match·binaries.·Placing·the·clause·that·matches·against·the·empty
128 binary·<em>last</em>·is·usually·slightly·faster·than·placing·it·<em>first</em>.</p><p>The·following·is·a·rather·unnatural·example·to·show·another·exception·where128 binary·<em>last</em>·is·usually·slightly·faster·than·placing·it·<em>first</em>.</p><p>The·following·is·a·rather·unnatural·example·to·show·another·exception·where
129 rearranging·clauses·is·beneficial:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-1">(</span><span·class="ss">one</span><span·class="p"·data-group-id="6664050571-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">129 rearranging·clauses·is·beneficial:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-1">(</span><span·class="ss">one</span><span·class="p"·data-group-id="9677425335-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">
130 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-2">(</span><span·class="ss">two</span><span·class="p"·data-group-id="6664050571-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">;</span><span·class="w">130 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-2">(</span><span·class="ss">two</span><span·class="p"·data-group-id="9677425335-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">;</span><span·class="w">
131 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-3">(</span><span·class="ss">three</span><span·class="p"·data-group-id="6664050571-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">;</span><span·class="w">131 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-3">(</span><span·class="ss">three</span><span·class="p"·data-group-id="9677425335-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">;</span><span·class="w">
132 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-4">(</span><span·class="n">Int</span><span·class="p"·data-group-id="6664050571-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="6664050571-5">([·...·truncated·by·diffoscope;·len:·74,·SHA:·f5f485a760c53f7f28e550d32c16c893522a9b2aaf8429e717cebc15c5eb296f·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">;</span><span·class="w">132 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-4">(</span><span·class="n">Int</span><span·class="p"·data-group-id="9677425335-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="9677425335-5">([·...·truncated·by·diffoscope;·len:·74,·SHA:·33db6a61233e3e2517d8abc7fa8a83ea01a140d116a4d5259caa21ac94c5397f·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">;</span><span·class="w">
133 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-6">(</span><span·class="ss">four</span><span·class="p"·data-group-id="6664050571-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">;</span><span·class="w">133 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-6">(</span><span·class="ss">four</span><span·class="p"·data-group-id="9677425335-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">;</span><span·class="w">
134 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-7">(</span><span·class="ss">five</span><span·class="p"·data-group-id="6664050571-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">;</span><span·class="w">134 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-7">(</span><span·class="ss">five</span><span·class="p"·data-group-id="9677425335-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">;</span><span·class="w">
135 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="6664050571-8">(</span><span·class="ss">six</span><span·class="p"·data-group-id="6664050571-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">.</span></code></pre><p>The·problem·is·the·clause·with·the·variable·<code·class="inline">Int</code>.·As·a·variable·can·match135 </span><span·class="nf">atom_map1</span><span·class="p"·data-group-id="9677425335-8">(</span><span·class="ss">six</span><span·class="p"·data-group-id="9677425335-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">.</span></code></pre><p>The·problem·is·the·clause·with·the·variable·<code·class="inline">Int</code>.·As·a·variable·can·match
136 anything,·including·the·atoms·<code·class="inline">four</code>,·<code·class="inline">five</code>,·and·<code·class="inline">six</code>,·which·the·following136 anything,·including·the·atoms·<code·class="inline">four</code>,·<code·class="inline">five</code>,·and·<code·class="inline">six</code>,·which·the·following
137 clauses·also·match,·the·compiler·must·generate·suboptimal·code·that·executes·as137 clauses·also·match,·the·compiler·must·generate·suboptimal·code·that·executes·as
138 follows:</p><ul><li>First,·the·input·value·is·compared·to·<code·class="inline">one</code>,·<code·class="inline">two</code>,·and·<code·class="inline">three</code>·(using·a138 follows:</p><ul><li>First,·the·input·value·is·compared·to·<code·class="inline">one</code>,·<code·class="inline">two</code>,·and·<code·class="inline">three</code>·(using·a
139 single·instruction·that·does·a·binary·search;·thus,·quite·efficient·even·if139 single·instruction·that·does·a·binary·search;·thus,·quite·efficient·even·if
140 there·are·many·values)·to·select·which·one·of·the·first·three·clauses·to140 there·are·many·values)·to·select·which·one·of·the·first·three·clauses·to
141 execute·(if·any).</li><li>If·none·of·the·first·three·clauses·match,·the·fourth·clause·match·as·a141 execute·(if·any).</li><li>If·none·of·the·first·three·clauses·match,·the·fourth·clause·match·as·a
142 variable·always·matches.</li><li>If·the·guard·test·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_integer/1"><code·class="inline">is_integer(Int)</code></a>·succeeds,·the·fourth142 variable·always·matches.</li><li>If·the·guard·test·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_integer/1"><code·class="inline">is_integer(Int)</code></a>·succeeds,·the·fourth
143 clause·is·executed.</li><li>If·the·guard·test·fails,·the·input·value·is·compared·to·<code·class="inline">four</code>,·<code·class="inline">five</code>,·and143 clause·is·executed.</li><li>If·the·guard·test·fails,·the·input·value·is·compared·to·<code·class="inline">four</code>,·<code·class="inline">five</code>,·and
144 <code·class="inline">six</code>,·and·the·appropriate·clause·is·selected.·(There·is·a·<code·class="inline">function_clause</code>144 <code·class="inline">six</code>,·and·the·appropriate·clause·is·selected.·(There·is·a·<code·class="inline">function_clause</code>
145 exception·if·none·of·the·values·matched.)</li></ul><p>Rewriting·to·either:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-1">(</span><span·class="ss">one</span><span·class="p"·data-group-id="1111593007-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">145 exception·if·none·of·the·values·matched.)</li></ul><p>Rewriting·to·either:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-1">(</span><span·class="ss">one</span><span·class="p"·data-group-id="0239979045-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">
146 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-2">(</span><span·class="ss">two</span><span·class="p"·data-group-id="1111593007-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">;</span><span·class="w">146 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-2">(</span><span·class="ss">two</span><span·class="p"·data-group-id="0239979045-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">;</span><span·class="w">
147 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-3">(</span><span·class="ss">three</span><span·class="p"·data-group-id="1111593007-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">;</span><span·class="w">147 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-3">(</span><span·class="ss">three</span><span·class="p"·data-group-id="0239979045-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">;</span><span·class="w">
148 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-4">(</span><span·class="ss">four</span><span·class="p"·data-group-id="1111593007-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">;</span><span·class="w">148 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-4">(</span><span·class="ss">four</span><span·class="p"·data-group-id="0239979045-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">;</span><span·class="w">
149 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-5">(</span><span·class="ss">five</span><span·class="p"·data-group-id="1111593007-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">;</span><span·class="w">149 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-5">(</span><span·class="ss">five</span><span·class="p"·data-group-id="0239979045-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">;</span><span·class="w">
150 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-6">(</span><span·class="ss">six</span><span·class="p"·data-group-id="1111593007-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">;</span><span·class="w">150 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-6">(</span><span·class="ss">six</span><span·class="p"·data-group-id="0239979045-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">;</span><span·class="w">
151 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="1111593007-7">(</span><span·class="n">Int</span><span·class="p"·data-group-id="1111593007-7">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="1111593007-8">([·...·truncated·by·diffoscope;·len:·703,·SHA:·419275b4cb2a86051a89791f6704f00761443e839a3d03d88bb46264b4d1580f·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">;</span><span·class="w">151 </span><span·class="nf">atom_map2</span><span·class="p"·data-group-id="0239979045-7">(</span><span·class="n">Int</span><span·class="p"·data-group-id="0239979045-7">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="0239979045-8">([·...·truncated·by·diffoscope;·len:·703,·SHA:·9e58331d8444a05de1547ec2ae0952297a6427211ce8f6a6a810ce57f9705ce2·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">;</span><span·class="w">
152 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="8806158732-3">(</span><span·class="ss">one</span><span·class="p"·data-group-id="8806158732-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">152 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="3454346983-3">(</span><span·class="ss">one</span><span·class="p"·data-group-id="3454346983-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">
153 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="8806158732-4">(</span><span·class="ss">two</span><span·class="p"·data-group-id="8806158732-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">;</span><span·class="w">153 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="3454346983-4">(</span><span·class="ss">two</span><span·class="p"·data-group-id="3454346983-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">;</span><span·class="w">
154 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="8806158732-5">(</span><span·class="ss">three</span><span·class="p"·data-group-id="8806158732-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">;</span><span·class="w">154 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="3454346983-5">(</span><span·class="ss">three</span><span·class="p"·data-group-id="3454346983-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">;</span><span·class="w">
155 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="8806158732-6">(</span><span·class="ss">four</span><span·class="p"·data-group-id="8806158732-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">;</span><span·class="w">155 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="3454346983-6">(</span><span·class="ss">four</span><span·class="p"·data-group-id="3454346983-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">;</span><span·class="w">
156 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="8806158732-7">(</span><span·class="ss">five</span><span·class="p"·data-group-id="8806158732-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">;</span><span·class="w">156 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="3454346983-7">(</span><span·class="ss">five</span><span·class="p"·data-group-id="3454346983-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">;</span><span·class="w">
157 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="8806158732-8">(</span><span·class="ss">six</span><span·class="p"·data-group-id="8806158732-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">.</span></code></pre><p>gives·slightl[·...·truncated·by·diffoscope;·len:·541,·SHA:·92d3d0f4ad6c67da494afb07080c15be609d7db5dff6c998c8d69d6a53eda3d0·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">atom_map3</span><span·class="p"·data-group-id="3454346983-8">(</span><span·class="ss">six</span><span·class="p"·data-group-id="3454346983-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">.</span></code></pre><p>gives·slightl[·...·truncated·by·diffoscope;·len:·541,·SHA:·b80b41ca21d74fb9bd97a022159f7285fddc0569155e3a4244ac4042a204ed17·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="n">Ys</span><span·class="p">;</span><span·class="w">158 ····</span><span·class="n">Ys</span><span·class="p">;</span><span·class="w">
159 </span><span·class="nf">map_pairs1</span><span·class="p"·data-group-id="6795865384-3">(</span><span·class="p">_</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Xs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6795865384-4">[</span><span·clas[·...·truncated·by·diffoscope;·len:·84,·SHA:·7914794d01a99178f95ab92aed5666a98694d0dfecf51abb2af156e0d6ef1cbd·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 </span><span·class="nf">map_pairs1</span><span·class="p"·data-group-id="4408516050-3">(</span><span·class="p">_</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Xs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4408516050-4">[</span><span·clas[·...·truncated·by·diffoscope;·len:·84,·SHA:·34534fbcfcc96f8f06c64992fa8912c692be3be825729840f3bc6d76dc2bf5be·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ····</span><span·class="n">Xs</span><span·class="p">;</span><span·class="w">160 ····</span><span·class="n">Xs</span><span·class="p">;</span><span·class="w">
161 </span><span·class="nf">map_pairs1</span><span·class="p"·data-group-id="6795865384-5">(</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6795865384-6">[</span><span·class="n">X</span><span·class="p">|</span><span·class="n">Xs</span><span·class="p"·data-group-id="679[·...·truncated·by·diffoscope;·len:·287,·SHA:·ef5f9c8786b248c7c62ed35edf53dfe5d6f01b456f09cd54582d686dd9a0e841·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">161 </span><span·class="nf">map_pairs1</span><span·class="p"·data-group-id="4408516050-5">(</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4408516050-6">[</span><span·class="n">X</span><span·class="p">|</span><span·class="n">Xs</span><span·class="p"·data-group-id="440[·...·truncated·by·diffoscope;·len:·287,·SHA:·70e5de6bd4aae79392090ee8294d214afbc2b80eebdaf88aa0172ddddd015afe·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
162 ····</span><span·class="p"·data-group-id="6795865384-8">[</span><span·class="n">Map</span><span·class="p"·data-group-id="6795865384-9">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6795865384-9">)</span><span·[·...·truncated·by·diffoscope;·len:·373,·SHA:·d3f452e5a3fe816665ee663286e2570e200cad527da512562e40796d63db7ec0·...·]-8">]</span><span·class="p">.</span></code></pre><p>The·first·argument·is·<em>not</em>·a·problem.·It·is·variable,·but·it·is·a·variable·in162 ····</span><span·class="p"·data-group-id="4408516050-8">[</span><span·class="n">Map</span><span·class="p"·data-group-id="4408516050-9">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="4408516050-9">)</span><span·[·...·truncated·by·diffoscope;·len:·373,·SHA:·ad14434621d1d46bd0b0c19ac0f329bd930308afa14067af084bc47c473215fa·...·]-8">]</span><span·class="p">.</span></code></pre><p>The·first·argument·is·<em>not</em>·a·problem.·It·is·variable,·but·it·is·a·variable·in
163 all·clauses.·The·problem·is·the·variable·in·the·second·argument,·<code·class="inline">Xs</code>,·in·the163 all·clauses.·The·problem·is·the·variable·in·the·second·argument,·<code·class="inline">Xs</code>,·in·the
164 middle·clause.·Because·the·variable·can·match·anything,·the·compiler·is·not164 middle·clause.·Because·the·variable·can·match·anything,·the·compiler·is·not
165 allowed·to·rearrange·the·clauses,·but·must·generate·code·that·matches·them·in165 allowed·to·rearrange·the·clauses,·but·must·generate·code·that·matches·them·in
166 the·order·written.</p><p>If·the·function·is·rewritten·as·follows,·the·compiler·is·free·to·rearrange·the166 the·order·written.</p><p>If·the·function·is·rewritten·as·follows,·the·compiler·is·free·to·rearrange·the
167 clauses:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">map_pairs2</span><span·class="p"·data-group-id="1730971263-1">(</span><span·class="p">_</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730971263-2">[</span><span·class="p"·data-group-id="1730971263-2">]</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·84,·SHA:·25ae6e0379d506299ee35d150c208d39d80a298fdfbb54dbd947802105fe53a3·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 clauses:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">map_pairs2</span><span·class="p"·data-group-id="4999984350-1">(</span><span·class="p">_</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4999984350-2">[</span><span·class="p"·data-group-id="4999984350-2">]</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·84,·SHA:·14e84582c09162616a9b3bddf2f4a69337e11a31daea08cb681448c22ab925b9·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 ····</span><span·class="n">Ys</span><span·class="p">;</span><span·class="w">168 ····</span><span·class="n">Ys</span><span·class="p">;</span><span·class="w">
169 </span><span·class="nf">map_pairs2</span><span·class="p"·data-group-id="1730971263-3">(</span><span·class="p">_</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730971263-4">[</span><span·class="p">_</span><span·class="p">|</span><span·class="p">_</span><span·class[·...·truncated·by·diffoscope;·len:·310,·SHA:·5944598175d578da3bc8379630f8464f2d45e4b9588b2402186931f8b07b5335·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 </span><span·class="nf">map_pairs2</span><span·class="p"·data-group-id="4999984350-3">(</span><span·class="p">_</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4999984350-4">[</span><span·class="p">_</span><span·class="p">|</span><span·class="p">_</span><span·class[·...·truncated·by·diffoscope;·len:·310,·SHA:·d2ffd506ee2c8e16d367ab5a07d5c1202d6c0c10ff22788ba6f1a80924fc0b34·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 ····</span><span·class="n">Xs</span><span·class="p">;</span><span·class="w">170 ····</span><span·class="n">Xs</span><span·class="p">;</span><span·class="w">
171 </span><span·class="nf">map_pairs2</span><span·class="p"·data-group-id="1730971263-6">(</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730971263-7">[</span><span·class="n">X</span><span·class="p">|</span><span·class="n">Xs</span><span·class="p"·data-group-id="173[·...·truncated·by·diffoscope;·len:·287,·SHA:·e08237b3b5526833f0743998ca2bac684cd6ab006e88999d6ffe0a259caa0a64·...·]-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 </span><span·class="nf">map_pairs2</span><span·class="p"·data-group-id="4999984350-6">(</span><span·class="n">Map</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4999984350-7">[</span><span·class="n">X</span><span·class="p">|</span><span·class="n">Xs</span><span·class="p"·data-group-id="499[·...·truncated·by·diffoscope;·len:·287,·SHA:·59ab8962e0952645d270fada0ba0a0b3f0cfc5d3763fd0d08b1ac47b790913a2·...·]-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ····</span><span·class="p"·data-group-id="1730971263-9">[</span><span·class="n">Map</span><span·class="p"·data-group-id="1730971263-10">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="1730971263-10">)</span><spa[·...·truncated·by·diffoscope;·len:·898,·SHA:·9d7ad811fb9bfe6ecc38f5a5ca7b3d5c5dff0756367751528ccae1eadb94ee5c·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 ····</span><span·class="p"·data-group-id="4999984350-9">[</span><span·class="n">Map</span><span·class="p"·data-group-id="4999984350-10">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="4999984350-10">)</span><spa[·...·truncated·by·diffoscope;·len:·898,·SHA:·b58c13adbfc30f57bdc5beb4ad3eab013308bd2958eba6aad679aa6ad6949aa6·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Xs0</span><span·class="w">·</span><span·class="k">of</span><span·class="w">173 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Xs0</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
174 »       </span><span·class="p"·data-group-id="7738401631-2">[</span><span·class="n">X</span><span·class="p">|</span><span·class="n">Xs</span><span·class="p"·data-group-id="7738401631-2">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">174 »       </span><span·class="p"·data-group-id="8797192150-2">[</span><span·class="n">X</span><span·class="p">|</span><span·class="n">Xs</span><span·class="p"·data-group-id="8797192150-2">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
175 »       ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Ys0</span><span·class="w">·</span><span·class="k">of</span><span·class="w">175 »       ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Ys0</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
176 »       »       </span><span·class="p"·data-group-id="7738401631-3">[</span><span·class="n">Y</span><span·class="p">|</span><span·class="n">Ys</span><span·class="p"·data-group-id="7738401631-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 »       »       </span><span·class="p"·data-group-id="8797192150-3">[</span><span·class="n">Y</span><span·class="p">|</span><span·class="n">Ys</span><span·class="p"·data-group-id="8797192150-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 »       »       ····</span><span·class="p"·data-group-id="7738401631-4">[</span><span·class="n">Map</span><span·class="p"·data-group-id="7738401631-5">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="7738401631-5">)</span><span·[·...·truncated·by·diffoscope;·len:·379,·SHA:·449e5b04ef07b2053ebdf130a1df5cb519c6f1a870faa97b44ba0f41118231af·...·]-4">]</span><span·class="p">;</span><span·class="w">177 »       »       ····</span><span·class="p"·data-group-id="8797192150-4">[</span><span·class="n">Map</span><span·class="p"·data-group-id="8797192150-5">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8797192150-5">)</span><span·[·...·truncated·by·diffoscope;·len:·379,·SHA:·dff6aba9fce0d8e1e373851edb4ec3c85532943d6cb47a65f3744e6744bb1cdb·...·]-4">]</span><span·class="p">;</span><span·class="w">
178 »       »       </span><span·class="p"·data-group-id="7738401631-7">[</span><span·class="p"·data-group-id="7738401631-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 »       »       </span><span·class="p"·data-group-id="8797192150-7">[</span><span·class="p"·data-group-id="8797192150-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 »       »       ····</span><span·class="n">Xs0</span><span·class="w">179 »       »       ····</span><span·class="n">Xs0</span><span·class="w">
180 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">180 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
181 »       </span><span·class="p"·data-group-id="7738401631-8">[</span><span·class="p"·data-group-id="7738401631-8">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">181 »       </span><span·class="p"·data-group-id="8797192150-8">[</span><span·class="p"·data-group-id="8797192150-8">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
182 »       ····</span><span·class="n">Ys0</span><span·class="w">182 »       ····</span><span·class="n">Ys0</span><span·class="w">
183 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>This·is·slightly·faster·for·probably·the·most·common·case·that·the·input·lists183 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>This·is·slightly·faster·for·probably·the·most·common·case·that·the·input·lists
184 are·not·empty·or·very·short.·(Another·advantage·is·that·Dialyzer·can·deduce·a184 are·not·empty·or·very·short.·(Another·advantage·is·that·Dialyzer·can·deduce·a
185 better·type·for·the·<code·class="inline">Xs</code>·variable.)</p><h2·id="function-calls"·class="section-heading">185 better·type·for·the·<code·class="inline">Xs</code>·variable.)</p><h2·id="function-calls"·class="section-heading">
186 ··<a·href="#function-calls"·class="hover-link">186 ··<a·href="#function-calls"·class="hover-link">
187 ····<i·class="ri-link-m"·aria-hidden="true"></i>187 ····<i·class="ri-link-m"·aria-hidden="true"></i>
188 ··</a>188 ··</a>
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250 ······<p·class="built-using">250 ······<p·class="built-using">
251 ········Built·using251 ········Built·using
252 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the252 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
253 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>253 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
254 ······</p>254 ······</p>
255 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>255 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
256 ····</footer>256 ····</footer>
257 ··</div>257 ··</div>
258 </main>258 </main>
259 </div>259 </div>
260 <script>260 <script>
261 ··function·mermaidLoaded()·{261 ··function·mermaidLoaded()·{
262 ····mermaid.initialize({262 ····mermaid.initialize({
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119 ··<a·href="#creating-an-erlang-process"·class="hover-link">119 ··<a·href="#creating-an-erlang-process"·class="hover-link">
120 ····<i·class="ri-link-m"·aria-hidden="true"></i>120 ····<i·class="ri-link-m"·aria-hidden="true"></i>
121 ··</a>121 ··</a>
122 ··<span·class="text">Creating·an·Erlang·Process</span>122 ··<span·class="text">Creating·an·Erlang·Process</span>
123 </h2>123 </h2>
124 <p>An·Erlang·process·is·lightweight·compared·to·threads·and·processes·in·operating124 <p>An·Erlang·process·is·lightweight·compared·to·threads·and·processes·in·operating
125 systems.</p><p>A·newly·spawned·Erlang·process·uses·327·words·of·memory.·The·size·can·be·found125 systems.</p><p>A·newly·spawned·Erlang·process·uses·327·words·of·memory.·The·size·can·be·found
126 as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="3100014074-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">14.2</span><span·class="p">.</span><span·class="mi">3</span><span·class="p"·data-group-id="3100014074-1">]</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·1122,·SHA:·b02df026cd11af873e96038744cd52c8d9eb8283599376988f5bc3d1eb01b067·...·]-6">]</span><span·class="w">126 as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="4278708822-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">14.2</span><span·class="p">.</span><span·class="mi">3</span><span·class="p"·data-group-id="4278708822-1">]</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·1122,·SHA:·0a1ac3c7c13896a539978f47be490844db4235fb861517faac55f4984d5c44b3·...·]-6">]</span><span·class="w">
  
127 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V14</span><span·class="p">.</span><span·class="mf">2.3</span><span·class="w">·</span><span·class="p"·data-group-id="3100014074-7">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·e819d90195d2d2b4f14308a248af260d42b5973f301a27bd0b84ccdd0dd03c7c·...·]-7">)</span><span·class="gp·unselectable">127 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V14</span><span·class="p">.</span><span·class="mf">2.3</span><span·class="w">·</span><span·class="p"·data-group-id="4278708822-7">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·359fa681588658f6038bf3e27bf597403acda5fb3b9b0ecbcc1a4dab7e52adea·...·]-7">)</span><span·class="gp·unselectable">
128 1&gt;·</span><span·class="n">Fun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="3100014074-9">(</span><span·class="p"·data-group-id="3100014074-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="k">receive</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">end</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">128 1&gt;·</span><span·class="n">Fun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="4278708822-9">(</span><span·class="p"·data-group-id="4278708822-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="k">receive</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">end</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
129 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">43.39164016</span><span·class="o">&gt;</span><span·class="gp·unselectable">129 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">43.39164016</span><span·class="o">&gt;</span><span·class="gp·unselectable">
130 2&gt;·</span><span·class="p"·data-group-id="3100014074-10">{</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="3100014074-10">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">process_info</[·...·truncated·by·diffoscope;·len:·341,·SHA:·6fdf7fd57754047e64c92fdc0cd2ae210488d6df76dfd4ee88f023ea0ff77989·...·]-11">)</span><span·class="p">.</span><span·class="w">130 2&gt;·</span><span·class="p"·data-group-id="4278708822-10">{</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="4278708822-10">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">process_info</[·...·truncated·by·diffoscope;·len:·341,·SHA:·81db4c9913090a6380d83aeca02d252df2e66835c6e0f4e0302979f0d2c1ed1e·...·]-11">)</span><span·class="p">.</span><span·class="w">
131 </span><span·class="p"·data-group-id="3100014074-13">{</span><span·class="nb">memory</span><span·class="p">,</span><span·class="mi">2616</span><span·class="p"·data-group-id="3100014074-13">}</span><span·class="gp·unselectable">131 </span><span·class="p"·data-group-id="4278708822-13">{</span><span·class="nb">memory</span><span·class="p">,</span><span·class="mi">2616</span><span·class="p"·data-group-id="4278708822-13">}</span><span·class="gp·unselectable">
132 3&gt;·</span><span·class="n">Bytes</span><span·class="w">·</span><span·class="ow">div</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="3100014074-14">(</span><span·class="ss">wordsize</span><span·class="p"·data-group-id="3100014074-14">)</span><span·class="p">.</span><span·class="w">132 3&gt;·</span><span·class="n">Bytes</span><span·class="w">·</span><span·class="ow">div</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="4278708822-14">(</span><span·class="ss">wordsize</span><span·class="p"·data-group-id="4278708822-14">)</span><span·class="p">.</span><span·class="w">
133 </span><span·class="mi">327</span></code></pre><p>The·size·includes·233·words·for·the·heap·area·(which·includes·the·stack).·The133 </span><span·class="mi">327</span></code></pre><p>The·size·includes·233·words·for·the·heap·area·(which·includes·the·stack).·The
134 garbage·collector·increases·the·heap·as·needed.</p><p>The·main·(outer)·loop·for·a·process·<em>must</em>·be·tail-recursive.·Otherwise,·the134 garbage·collector·increases·the·heap·as·needed.</p><p>The·main·(outer)·loop·for·a·process·<em>must</em>·be·tail-recursive.·Otherwise,·the
135 stack·grows·until·the·process·terminates.</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="4322730871-1">(</span><span·class="p"·data-group-id="4322730871-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">135 stack·grows·until·the·process·terminates.</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="7642598840-1">(</span><span·class="p"·data-group-id="7642598840-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
136 ··</span><span·class="k">receive</span><span·class="w">136 ··</span><span·class="k">receive</span><span·class="w">
137 ·····</span><span·class="p"·data-group-id="4322730871-2">{</span><span·class="ss">sys</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="4322730871-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">137 ·····</span><span·class="p"·data-group-id="7642598840-2">{</span><span·class="ss">sys</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7642598840-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
138 ·········</span><span·class="nf">handle_sys_msg</span><span·class="p"·data-group-id="4322730871-3">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="4322730871-3">)</span><span·class="p">,</span><span·class="w">138 ·········</span><span·class="nf">handle_sys_msg</span><span·class="p"·data-group-id="7642598840-3">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="7642598840-3">)</span><span·class="p">,</span><span·class="w">
139 ·········</span><span·class="nf">loop</span><span·class="p"·data-group-id="4322730871-4">(</span><span·class="p"·data-group-id="4322730871-4">)</span><span·class="p">;</span><span·class="w">139 ·········</span><span·class="nf">loop</span><span·class="p"·data-group-id="7642598840-4">(</span><span·class="p"·data-group-id="7642598840-4">)</span><span·class="p">;</span><span·class="w">
140 ·····</span><span·class="p"·data-group-id="4322730871-5">{</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="4322730871-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">140 ·····</span><span·class="p"·data-group-id="7642598840-5">{</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7642598840-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
141 ··········</span><span·class="n">Reply</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="4322730871-6">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="4322730871-6">)</span><span·class="p">,</span><span·class="w">141 ··········</span><span·class="n">Reply</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="7642598840-6">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="7642598840-6">)</span><span·class="p">,</span><span·class="w">
142 ··········</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p">,</span><span·class="w">142 ··········</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p">,</span><span·class="w">
143 ··········</span><span·class="nf">loop</span><span·class="p"·data-group-id="4322730871-7">(</span><span·class="p"·data-group-id="4322730871-7">)</span><span·class="w">143 ··········</span><span·class="nf">loop</span><span·class="p"·data-group-id="7642598840-7">(</span><span·class="p"·data-group-id="7642598840-7">)</span><span·class="w">
144 ··</span><span·class="k">end</span><span·class="p">,</span><span·class="w">144 ··</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
145 ··</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4322730871-8">(</span><span·class="s">&quot;Message·is·processed</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4322730871-9">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·925d81ed3c845a5cb1a5630a715fcb5f1ef05964a82cee8ddc2276090175e80f·...·]-8">)</span><span·class="p">.</span></code></pre><p>The·call·to·<a·href="../../lib/stdlib-6.2.2/doc/html/io.html#format/2"><code·class="inline">io:format/2</code></a>·will·never·be·executed,·but·a·return·address·will145 ··</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7642598840-8">(</span><span·class="s">&quot;Message·is·processed</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7642598840-9">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·7ef32dd9e74aa36a2dce87452a8a960017daecc0e34c5ea90bdcdff5fd76f6e6·...·]-8">)</span><span·class="p">.</span></code></pre><p>The·call·to·<a·href="../../lib/stdlib-6.2.2/doc/html/io.html#format/2"><code·class="inline">io:format/2</code></a>·will·never·be·executed,·but·a·return·address·will
146 still·be·pushed·to·the·stack·each·time·<code·class="inline">loop/0</code>·is·called·recursively.·The146 still·be·pushed·to·the·stack·each·time·<code·class="inline">loop/0</code>·is·called·recursively.·The
147 correct·tail-recursive·version·of·the·function·looks·as·follows:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="1607282487-1">(</span><span·class="p"·data-group-id="1607282487-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">147 correct·tail-recursive·version·of·the·function·looks·as·follows:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="1196607608-1">(</span><span·class="p"·data-group-id="1196607608-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
148 ···</span><span·class="k">receive</span><span·class="w">148 ···</span><span·class="k">receive</span><span·class="w">
149 ······</span><span·class="p"·data-group-id="1607282487-2">{</span><span·class="ss">sys</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1607282487-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">149 ······</span><span·class="p"·data-group-id="1196607608-2">{</span><span·class="ss">sys</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1196607608-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
150 ·········</span><span·class="nf">handle_sys_msg</span><span·class="p"·data-group-id="1607282487-3">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="1607282487-3">)</span><span·class="p">,</span><span·class="w">150 ·········</span><span·class="nf">handle_sys_msg</span><span·class="p"·data-group-id="1196607608-3">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="1196607608-3">)</span><span·class="p">,</span><span·class="w">
151 ·········</span><span·class="nf">loop</span><span·class="p"·data-group-id="1607282487-4">(</span><span·class="p"·data-group-id="1607282487-4">)</span><span·class="p">;</span><span·class="w">151 ·········</span><span·class="nf">loop</span><span·class="p"·data-group-id="1196607608-4">(</span><span·class="p"·data-group-id="1196607608-4">)</span><span·class="p">;</span><span·class="w">
152 ······</span><span·class="p"·data-group-id="1607282487-5">{</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1607282487-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">152 ······</span><span·class="p"·data-group-id="1196607608-5">{</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1196607608-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
153 ·········</span><span·class="n">Reply</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="1607282487-6">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="1607282487-6">)</span><span·class="p">,</span><span·class="w">153 ·········</span><span·class="n">Reply</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="1196607608-6">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="1196607608-6">)</span><span·class="p">,</span><span·class="w">
154 ·········</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p">,</span><span·class="w">154 ·········</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p">,</span><span·class="w">
155 ·········</span><span·class="nf">loop</span><span·class="p"·data-group-id="1607282487-7">(</span><span·class="p"·data-group-id="1607282487-7">)</span><span·class="w">155 ·········</span><span·class="nf">loop</span><span·class="p"·data-group-id="1196607608-7">(</span><span·class="p"·data-group-id="1196607608-7">)</span><span·class="w">
156 ·</span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="initial-heap-size"·class="section-heading">156 ·</span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="initial-heap-size"·class="section-heading">
157 ··<a·href="#initial-heap-size"·class="hover-link">157 ··<a·href="#initial-heap-size"·class="hover-link">
158 ····<i·class="ri-link-m"·aria-hidden="true"></i>158 ····<i·class="ri-link-m"·aria-hidden="true"></i>
159 ··</a>159 ··</a>
160 ··<span·class="text">Initial·Heap·Size</span>160 ··<span·class="text">Initial·Heap·Size</span>
161 </h3>161 </h3>
162 <p>The·default·initial·heap·size·of·233·words·is·quite·conservative·to·support162 <p>The·default·initial·heap·size·of·233·words·is·quite·conservative·to·support
Offset 189, 30 lines modifiedOffset 189, 30 lines modified
189 ····<i·class="ri-link-m"·aria-hidden="true"></i>189 ····<i·class="ri-link-m"·aria-hidden="true"></i>
190 ··</a>190 ··</a>
191 ··<span·class="text">Receiving·messages</span>191 ··<span·class="text">Receiving·messages</span>
192 </h2>192 </h2>
193 <p>The·cost·of·receiving·messages·depends·on·how·complicated·the·<code·class="inline">receive</code>193 <p>The·cost·of·receiving·messages·depends·on·how·complicated·the·<code·class="inline">receive</code>
194 expression·is.·A·simple·expression·that·matches·any·message·is·very·cheap194 expression·is.·A·simple·expression·that·matches·any·message·is·very·cheap
195 because·it·retrieves·the·first·message·in·the·message·queue:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">receive</span><span·class="w">195 because·it·retrieves·the·first·message·in·the·message·queue:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">receive</span><span·class="w">
196 ····</span><span·class="n">Message</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="2867733349-1">(</span><span·class="n">Message</span><span·class="p"·data-group-id="2867733349-1">)</span><span·class="w">196 ····</span><span·class="n">Message</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="7966150926-1">(</span><span·class="n">Message</span><span·class="p"·data-group-id="7966150926-1">)</span><span·class="w">
197 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>However,·this·is·not·always·convenient:·we·can·receive·a·message·that·we·do·not197 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>However,·this·is·not·always·convenient:·we·can·receive·a·message·that·we·do·not
198 know·how·to·handle·at·this·point,·so·it·is·common·to·only·match·the·messages·we198 know·how·to·handle·at·this·point,·so·it·is·common·to·only·match·the·messages·we
199 expect:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">receive</span><span·class="w">199 expect:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">receive</span><span·class="w">
200 ····</span><span·class="p"·data-group-id="0425000152-1">{</span><span·class="n">Tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="0425000152-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·157,·SHA:·36f14a53955dd3564f1ea033276b304041a2b8cb146795ad155e87a9cdc4f04d·...·]-2">)</span><span·class="w">200 ····</span><span·class="p"·data-group-id="2663217357-1">{</span><span·class="n">Tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="2663217357-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·157,·SHA:·e4ce759b85a673c6a53ea63b408601b0d5525da7da442d624e7e98c19120d4b2·...·]-2">)</span><span·class="w">
201 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>While·this·is·convenient·it·means·that·the·entire·message·queue·must·be·searched201 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>While·this·is·convenient·it·means·that·the·entire·message·queue·must·be·searched
202 until·it·finds·a·matching·message.·This·is·very·expensive·for·processes·with202 until·it·finds·a·matching·message.·This·is·very·expensive·for·processes·with
203 long·message·queues,·so·there·is·an·optimization·for·the·common·case·of203 long·message·queues,·so·there·is·an·optimization·for·the·common·case·of
204 sending·a·request·and·waiting·for·a·response·shortly·after:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">MRef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">monitor</span><span·class="p"·data-group-id="4424063823-1">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Process</span><span·class="p"·data-group-id="4424063823-1">)</span><span·class="p">,</span><span·class="w">204 sending·a·request·and·waiting·for·a·response·shortly·after:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">MRef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">monitor</span><span·class="p"·data-group-id="5975466825-1">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Process</span><span·class="p"·data-group-id="5975466825-1">)</span><span·class="p">,</span><span·class="w">
205 </span><span·class="n">Process</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4424063823-2">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4424063823-3">(</span><span·class="p"·data-group-id="4424063823-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·6a11d403c2d965879a82449dba0680c1886f5bb24f8616f2d4e52a03e9b77f57·...·]-2">}</span><span·class="p">,</span><span·class="w">205 </span><span·class="n">Process</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5975466825-2">{</span><span·class="nf">self</span><span·class="p"·data-group-id="5975466825-3">(</span><span·class="p"·data-group-id="5975466825-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·8b44deb9413f9d26d57083cf591b54fe31f692b2f8e896dba4908665424531e8·...·]-2">}</span><span·class="p">,</span><span·class="w">
206 </span><span·class="k">receive</span><span·class="w">206 </span><span·class="k">receive</span><span·class="w">
207 ····</span><span·class="p"·data-group-id="4424063823-4">{</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p"·data-group-id="4424063823-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">207 ····</span><span·class="p"·data-group-id="5975466825-4">{</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p"·data-group-id="5975466825-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
208 ········</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="4424063823-5">(</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4424063823-6">[</span><span·class="ss">flush</span><span·class="p"·data-group-id="4424063823-6">]</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·7d787cc7c02bb3d8040a3de7f05dc8e2bc13d1147c9faf2610dcba9bf7a60179·...·]-5">)</span><span·class="p">,</span><span·class="w">208 ········</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="5975466825-5">(</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5975466825-6">[</span><span·class="ss">flush</span><span·class="p"·data-group-id="5975466825-6">]</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·83f0e1df96a22c0d6b121d9298ce834900198749531135d85c743230ab09bfc8·...·]-5">)</span><span·class="p">,</span><span·class="w">
209 ········</span><span·class="nf">handle_reply</span><span·class="p"·data-group-id="4424063823-7">(</span><span·class="n">Reply</span><span·class="p"·data-group-id="4424063823-7">)</span><span·class="p">;</span><span·class="w">209 ········</span><span·class="nf">handle_reply</span><span·class="p"·data-group-id="5975466825-7">(</span><span·class="n">Reply</span><span·class="p"·data-group-id="5975466825-7">)</span><span·class="p">;</span><span·class="w">
210 ····</span><span·class="p"·data-group-id="4424063823-8">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·141,·SHA:·f994948d58d8afaefabcac0e5706ffffa5829472d54ffc14ca95257d2a3c6828·...·]-8">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 ····</span><span·class="p"·data-group-id="5975466825-8">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·141,·SHA:·303712eec7027f2fe55d600cf988ebd6103cb8dea11ac8afc73cfe34fe3925a9·...·]-8">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ········</span><span·class="nf">handle_error</span><span·class="p"·data-group-id="4424063823-9">(</span><span·class="n">Reason</span><span·class="p"·data-group-id="4424063823-9">)</span><span·class="w">211 ········</span><span·class="nf">handle_error</span><span·class="p"·data-group-id="5975466825-9">(</span><span·class="n">Reason</span><span·class="p"·data-group-id="5975466825-9">)</span><span·class="w">
212 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Since·the·compiler·knows·that·the·reference·created·by212 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Since·the·compiler·knows·that·the·reference·created·by
213 <a·href="../../erts-15.2.6/doc/html/erlang.html#monitor/2"><code·class="inline">monitor/2</code></a>·cannot·exist·before·the·call·(since·it·is·a·globally213 <a·href="../../erts-15.2.6/doc/html/erlang.html#monitor/2"><code·class="inline">monitor/2</code></a>·cannot·exist·before·the·call·(since·it·is·a·globally
214 unique·identifier),·and·that·the·<code·class="inline">receive</code>·only·matches·messages·that·contain214 unique·identifier),·and·that·the·<code·class="inline">receive</code>·only·matches·messages·that·contain
215 said·reference,·it·will·tell·the·emulator·to·search·only·the·messages·that215 said·reference,·it·will·tell·the·emulator·to·search·only·the·messages·that
216 arrived·after·the·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#monitor/2"><code·class="inline">monitor/2</code></a>.</p><p>The·above·is·a·simple·example·where·one·is·but·guaranteed·that·the·optimization216 arrived·after·the·call·to·<a·href="../../erts-15.2.6/doc/html/erlang.html#monitor/2"><code·class="inline">monitor/2</code></a>.</p><p>The·above·is·a·simple·example·where·one·is·but·guaranteed·that·the·optimization
217 will·take,·but·what·about·more·complicated·code?</p><p><a·href=""·id="recv_opt_info"></a></p><h3·id="option-recv_opt_info"·class="section-heading">217 will·take,·but·what·about·more·complicated·code?</p><p><a·href=""·id="recv_opt_info"></a></p><h3·id="option-recv_opt_info"·class="section-heading">
218 ··<a·href="#option-recv_opt_info"·class="hover-link">218 ··<a·href="#option-recv_opt_info"·class="hover-link">
Offset 228, 101 lines modifiedOffset 228, 101 lines modified
228 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">200</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">NOT</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">all</span><span·class="w">·</span><span·class="ss">clauses</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">match</span><span·class="w">·</span><span·class="ss">a</span><span·class="w">·</span><span·class="ss">suitable</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">228 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">200</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">NOT</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">all</span><span·class="w">·</span><span·class="ss">clauses</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">match</span><span·class="w">·</span><span·class="ss">a</span><span·class="w">·</span><span·class="ss">suitable</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">
229 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">206</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">used</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">mark</span><span·class="w">·</span><span·class="ss">a</span><span·class="w">·</span><span·class="ss">message</span><span·class="w">·</span><span·class="ss">queue</span><span·class="w">·</span><span·class="ss">position</span><span·class="w">229 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">206</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">used</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">mark</span><span·class="w">·</span><span·class="ss">a</span><span·class="w">·</span><span·class="ss">message</span><span·class="w">·</span><span·class="ss">queue</span><span·class="w">·</span><span·class="ss">position</span><span·class="w">
230 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">208</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">all</span><span·class="w">·</span><span·class="ss">clauses</span><span·class="w">·</span><span·class="ss">match</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">created</span><span·class="w">·</span><span·class="ss">by</span><span·class="w">·</span><span·class="nb">monitor</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·</span><span·class="ss">at</span><span·class="w">·</span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">206</span><span·class="w">230 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">208</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">all</span><span·class="w">·</span><span·class="ss">clauses</span><span·class="w">·</span><span·class="ss">match</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">created</span><span·class="w">·</span><span·class="ss">by</span><span·class="w">·</span><span·class="nb">monitor</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·</span><span·class="ss">at</span><span·class="w">·</span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">206</span><span·class="w">
231 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">219</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">INFO</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">passing</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">created</span><span·class="w">·</span><span·class="ss">by</span><span·class="w">·</span><span·class="ss">make_ref</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">at</span><span·class="w">·</span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">218</span><span·class="w">231 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">219</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">INFO</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">passing</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">created</span><span·class="w">·</span><span·class="ss">by</span><span·class="w">·</span><span·class="ss">make_ref</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">at</span><span·class="w">·</span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">218</span><span·class="w">
232 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">222</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">all</span><span·class="w">·</span><span·class="ss">clauses</span><span·class="w">·</span><span·class="ss">match</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="ss">parameter</span><span·class="w">·</span><span·class="mi">1</span></code></pre><p>To·make·it·clearer·exactly·what·code·the·warnings·refer·to,·the·warnings·in·the232 </span><span·class="ss">efficiency_guide</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">222</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="n">OPTIMIZED</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">all</span><span·class="w">·</span><span·class="ss">clauses</span><span·class="w">·</span><span·class="ss">match</span><span·class="w">·</span><span·class="ss">reference</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="ss">parameter</span><span·class="w">·</span><span·class="mi">1</span></code></pre><p>To·make·it·clearer·exactly·what·code·the·warnings·refer·to,·the·warnings·in·the
233 following·examples·are·inserted·as·comments·after·the·clause·they·refer·to,·for233 following·examples·are·inserted·as·comments·after·the·clause·they·refer·to,·for
234 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·DO</span><span·class="w">234 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·DO</span><span·class="w">
235 </span><span·class="nf">simple_receive</span><span·class="p"·data-group-id="8525171223-1">(</span><span·class="p"·data-group-id="8525171223-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">235 </span><span·class="nf">simple_receive</span><span·class="p"·data-group-id="9655876579-1">(</span><span·class="p"·data-group-id="9655876579-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
236 </span><span·class="c1">%%·efficiency_guide.erl:194:·Warning:·INFO:·not·a·selective·receive,·this·is·always·fast</span><span·class="w">236 </span><span·class="c1">%%·efficiency_guide.erl:194:·Warning:·INFO:·not·a·selective·receive,·this·is·always·fast</span><span·class="w">
237 </span><span·class="k">receive</span><span·class="w">237 </span><span·class="k">receive</span><span·class="w">
238 ····</span><span·class="n">Message</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="8525171223-2">(</span><span·class="n">Message</span><span·class="p"·data-group-id="8525171223-2">)</span><span·class="w">238 ····</span><span·class="n">Message</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle_msg</span><span·class="p"·data-group-id="9655876579-2">(</span><span·class="n">Message</span><span·class="p"·data-group-id="9655876579-2">)</span><span·class="w">
239 </span><span·class="k">end</span><span·class="p">.</span><span·class="w">239 </span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
240 </span><span·class="c1">%%·DO·NOT,·unless·Tag·is·known·to·be·a·suitable·reference:·see</span><span·class="w">240 </span><span·class="c1">%%·DO·NOT,·unless·Tag·is·known·to·be·a·suitable·reference:·see</span><span·class="w">
241 </span><span·class="c1">%%·cross_function_receive/0·further·down.</span><span·class="w">241 </span><span·class="c1">%%·cross_function_receive/0·further·down.</span><span·class="w">
242 </span><span·class="nf">selective_receive</span><span·class="p"·data-group-id="8525171223-3">(</span><span·class="n">Tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="8525171223-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">242 </span><span·class="nf">selective_receive</span><span·class="p"·data-group-id="9655876579-3">(</span><span·class="n">Tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="9655876579-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
243 </span><span·class="c1">%%·efficiency_guide.erl:200:·Warning:·NOT·OPTIMIZED:·all·clauses·do·not·match·a·suitable·reference</span><span·class="w">243 </span><span·class="c1">%%·efficiency_guide.erl:200:·Warning:·NOT·OPTIMIZED:·all·clauses·do·not·match·a·suitable·reference</span><span·class="w">
244 </span><span·class="k">receive</span><span·class="w">244 </span><span·class="k">receive</span><span·class="w">
245 ····</span><span·class="p"·data-group-id="8525171223-4">{</span><span·class="n">Tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="8525171223-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·157,·SHA:·8bd2efcd17a22d82caff58aba8b60d13fc0c762e7e5193b8918395d96a4df2a2·...·]-5">)</span><span·class="w">245 ····</span><span·class="p"·data-group-id="9655876579-4">{</span><span·class="n">Tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="9655876579-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·157,·SHA:·e3c9422993c7ee7153e049cc2c47f4220249cf87bb26d26478869eb112cf4704·...·]-5">)</span><span·class="w">
246 </span><span·class="k">end</span><span·class="p">.</span><span·class="w">246 </span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
247 </span><span·class="c1">%%·DO</span><span·class="w">247 </span><span·class="c1">%%·DO</span><span·class="w">
248 </span><span·class="nf">optimized_receive</span><span·class="p"·data-group-id="8525171223-6">(</span><span·class="n">Process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p"·data-group-id="8525171223-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">248 </span><span·class="nf">optimized_receive</span><span·class="p"·data-group-id="9655876579-6">(</span><span·class="n">Process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p"·data-group-id="9655876579-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
249 </span><span·class="c1">%%·efficiency_guide.erl:206:·Warning:·OPTIMIZED:·reference·used·to·mark·a·message·queue·position</span><span·class="w">249 </span><span·class="c1">%%·efficiency_guide.erl:206:·Warning:·OPTIMIZED:·reference·used·to·mark·a·message·queue·position</span><span·class="w">
250 ····</span><span·class="n">MRef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">monitor</span><span·class="p"·data-group-id="8525171223-7">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Process</span><span·class="p"·data-group-id="8525171223-7">)</span><span·class="p">,</span><span·class="w">250 ····</span><span·class="n">MRef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">monitor</span><span·class="p"·data-group-id="9655876579-7">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Process</span><span·class="p"·data-group-id="9655876579-7">)</span><span·class="p">,</span><span·class="w">
251 ····</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="8525171223-8">{</span><span·class="nf">self</span><span·class="p"·data-group-id="8525171223-9">(</span><span·class="p"·data-group-id="8525171223-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·a134cd903ec6e014a9f2014d70c0394c1eea94b27f94ceb16d50fe96827d829a·...·]-8">}</span><span·class="p">,</span><span·class="w">251 ····</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="9655876579-8">{</span><span·class="nf">self</span><span·class="p"·data-group-id="9655876579-9">(</span><span·class="p"·data-group-id="9655876579-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·bbf95f8552d736c0d572b4cd608ee41cc7aa184babff07fa81dface58166cf20·...·]-8">}</span><span·class="p">,</span><span·class="w">
252 ····</span><span·class="c1">%%·efficiency_guide.erl:208:·Warning:·OPTIMIZED:·matches·reference·created·by·monitor/2·at·efficiency_guide.erl:206</span><span·class="w">252 ····</span><span·class="c1">%%·efficiency_guide.erl:208:·Warning:·OPTIMIZED:·matches·reference·created·by·monitor/2·at·efficiency_guide.erl:206</span><span·class="w">
253 ····</span><span·class="k">receive</span><span·class="w">253 ····</span><span·class="k">receive</span><span·class="w">
254 ········</span><span·class="p"·data-group-id="8525171223-10">{</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p"·data-group-id="8525171223-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">254 ········</span><span·class="p"·data-group-id="9655876579-10">{</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reply</span><span·class="p"·data-group-id="9655876579-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
255 ········</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="8525171223-11">(</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8525171223-12">[</span><span·class="ss">flush</span><span·class="p"·data-group-id="8525171223-12">]</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·5ad0348f49661ba03d81f682b42f2246005c4a0d267b61da098395262dbd1940·...·]-11">)</span><span·class="p">,</span><span·class="w">255 ········</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="9655876579-11">(</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9655876579-12">[</span><span·class="ss">flush</span><span·class="p"·data-group-id="9655876579-12">]</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·3b4974cf9e41be60eb5a4c5b34115db98ea34da297bf22b8b33af281e2dd04d3·...·]-11">)</span><span·class="p">,</span><span·class="w">
256 ········</span><span·class="nf">handle_reply</span><span·class="p"·data-group-id="8525171223-13">(</span><span·class="n">Reply</span><span·class="p"·data-group-id="8525171223-13">)</span><span·class="p">;</span><span·class="w">256 ········</span><span·class="nf">handle_reply</span><span·class="p"·data-group-id="9655876579-13">(</span><span·class="n">Reply</span><span·class="p"·data-group-id="9655876579-13">)</span><span·class="p">;</span><span·class="w">
257 ····</span><span·class="p"·data-group-id="8525171223-14">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·142,·SHA:·fd0fb1bcb0d356fe8a36b5e13e54568bb509b8672b3788c50e86c7610bfa418e·...·]-14">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">257 ····</span><span·class="p"·data-group-id="9655876579-14">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·142,·SHA:·e926875eb079646f54befc0a9b4d2660e3c775c5f85d1df15e3394f660350164·...·]-14">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
258 ····</span><span·class="nf">handle_error</span><span·class="p"·data-group-id="8525171223-15">(</span><span·class="n">Reason</span><span·class="p"·data-group-id="8525171223-15">)</span><span·class="w">258 ····</span><span·class="nf">handle_error</span><span·class="p"·data-group-id="9655876579-15">(</span><span·class="n">Reason</span><span·class="p"·data-group-id="9655876579-15">)</span><span·class="w">
259 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">259 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
260 </span><span·class="c1">%%·DO</span><span·class="w">260 </span><span·class="c1">%%·DO</span><span·class="w">
261 </span><span·class="nf">cross_function_receive</span><span·class="p"·data-group-id="8525171223-16">(</span><span·class="p"·data-group-id="8525171223-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">261 </span><span·class="nf">cross_function_receive</span><span·class="p"·data-group-id="9655876579-16">(</span><span·class="p"·data-group-id="9655876579-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
262 ····</span><span·class="c1">%%·efficiency_guide.erl:218:·Warning:·OPTIMIZED:·reference·used·to·mark·a·message·queue·position</span><span·class="w">262 ····</span><span·class="c1">%%·efficiency_guide.erl:218:·Warning:·OPTIMIZED:·reference·used·to·mark·a·message·queue·position</span><span·class="w">
263 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="8525171223-17">(</span><span·class="p"·data-group-id="8525171223-17">)</span><span·class="p">,</span><span·class="w">263 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="9655876579-17">(</span><span·class="p"·data-group-id="9655876579-17">)</span><span·class="p">,</span><span·class="w">
264 ····</span><span·class="c1">%%·efficiency_guide.erl:219:·Warning:·INFO:·passing·reference·created·by·make_ref/0·at·efficiency_guide.erl:218</span><span·class="w">264 ····</span><span·class="c1">%%·efficiency_guide.erl:219:·Warning:·INFO:·passing·reference·created·by·make_ref/0·at·efficiency_guide.erl:218</span><span·class="w">
265 ····</span><span·class="nf">cross_function_receive</span><span·class="p"·data-group-id="8525171223-18">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="8525171223-18">)</span><span·class="p">.</span><span·class="w">265 ····</span><span·class="nf">cross_function_receive</span><span·class="p"·data-group-id="9655876579-18">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="9655876579-18">)</span><span·class="p">.</span><span·class="w">
  
266 </span><span·class="nf">cross_function_receive</span><span·class="p"·data-group-id="8525171223-19">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="8525171223-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">266 </span><span·class="nf">cross_function_receive</span><span·class="p"·data-group-id="9655876579-19">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="9655876579-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
267 ····</span><span·class="c1">%%·efficiency_guide.erl:222:·Warning:·OPTIMIZED:·all·clauses·match·reference·in·function·parameter·1</span><span·class="w">267 ····</span><span·class="c1">%%·efficiency_guide.erl:222:·Warning:·OPTIMIZED:·all·clauses·match·reference·in·function·parameter·1</span><span·class="w">
268 ····</span><span·class="k">receive</span><span·class="w">268 ····</span><span·class="k">receive</span><span·class="w">
269 ········</span><span·class="p"·data-group-id="8525171223-20">{</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="8525171223-20">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·160,·SHA:·ae74c183362898fb405ad73b3e784baa1d9358fb366112bb3356820e3dba123d·...·]-21">)</span><span·class="w">269 ········</span><span·class="p"·data-group-id="9655876579-20">{</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="9655876579-20">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·160,·SHA:·6ad07736341f8ad3edbb5a4e740e8ad340fab8a86cce45dd27002831f1f54cc8·...·]-21">)</span><span·class="w">
270 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><h2·id="literal-pool"·class="section-heading">270 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><h2·id="literal-pool"·class="section-heading">
271 ··<a·href="#literal-pool"·class="hover-link">271 ··<a·href="#literal-pool"·class="hover-link">
272 ····<i·class="ri-link-m"·aria-hidden="true"></i>272 ····<i·class="ri-link-m"·aria-hidden="true"></i>
273 ··</a>273 ··</a>
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185 ······<p·class="built-using">185 ······<p·class="built-using">
186 ········Built·using186 ········Built·using
187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
189 ······</p>189 ······</p>
190 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>190 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
191 ····</footer>191 ····</footer>
192 ··</div>192 ··</div>
193 </main>193 </main>
194 </div>194 </div>
195 <script>195 <script>
196 ··function·mermaidLoaded()·{196 ··function·mermaidLoaded()·{
197 ····mermaid.initialize({197 ····mermaid.initialize({
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399 ········Built·using399 ········Built·using
400 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the400 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
401 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>401 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
402 ······</p>402 ······</p>
403 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>403 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
404 ····</footer>404 ····</footer>
405 ··</div>405 ··</div>
406 </main>406 </main>
407 </div>407 </div>
408 <script>408 <script>
409 ··function·mermaidLoaded()·{409 ··function·mermaidLoaded()·{
410 ····mermaid.initialize({410 ····mermaid.initialize({
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120 to·read·the·port·example·in·<a·href="c_port.html">Ports</a>·before·reading·this·section.</p><h2·id="erlang-program"·class="section-heading">120 to·read·the·port·example·in·<a·href="c_port.html">Ports</a>·before·reading·this·section.</p><h2·id="erlang-program"·class="section-heading">
121 ··<a·href="#erlang-program"·class="hover-link">121 ··<a·href="#erlang-program"·class="hover-link">
122 ····<i·class="ri-link-m"·aria-hidden="true"></i>122 ····<i·class="ri-link-m"·aria-hidden="true"></i>
123 ··</a>123 ··</a>
124 ··<span·class="text">Erlang·Program</span>124 ··<span·class="text">Erlang·Program</span>
125 </h2>125 </h2>
126 <p>The·following·example·shows·an·Erlang·program·communicating·with·a·C·program126 <p>The·following·example·shows·an·Erlang·program·communicating·with·a·C·program
127 over·a·plain·port·with·home·made·encoding:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4798467447-1">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="4798467447-1">)</span><span·class="p">.</span><span·class="w">127 over·a·plain·port·with·home·made·encoding:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5276444823-1">(</span><span·class="ss">complex1</span><span·class="p"·data-group-id="5276444823-1">)</span><span·class="p">.</span><span·class="w">
128 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4798467447-2">(</span><span·class="p"·data-group-id="4798467447-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·59e020500adb143ec715be78b5bb4388e3ea3c1804ab01651426872fb3d0f009·...·]-2">)</span><span·class="p">.</span><span·class="w">128 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5276444823-2">(</span><span·class="p"·data-group-id="5276444823-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·d3cc1021b6a4af050ba8056c6a530f3fbe6c848b36373869e906d5483fb2f17e·...·]-2">)</span><span·class="p">.</span><span·class="w">
129 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4798467447-4">(</span><span·class="p"·data-group-id="4798467447-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·b1e74291d465b69108dee6240061c882413359d1a29dce90484b3260f4c15fef·...·]-4">)</span><span·class="p">.</span><span·class="w">129 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5276444823-4">(</span><span·class="p"·data-group-id="5276444823-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·31de47c3a2cbe60bbeee3fc35fb1b80786ef99c0fc6729103a25eaf1b513c2f5·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
130 </span><span·class="nf">start</span><span·class="p"·data-group-id="4798467447-6">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="4798467447-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">130 </span><span·class="nf">start</span><span·class="p"·data-group-id="5276444823-6">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="5276444823-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
131 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4798467447-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-8">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·542fe88deb9ac6bfbed940793dfce1b38acb57eb60bf1928f3f8d1a66fedf24e·...·]-7">)</span><span·class="p">.</span><span·class="w">131 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="5276444823-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-8">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·f64d57eb59f4455bbd83ea517be538fb72a619ddab1d42df3c399485156e19c3·...·]-7">)</span><span·class="p">.</span><span·class="w">
132 </span><span·class="nf">stop</span><span·class="p"·data-group-id="4798467447-9">(</span><span·class="p"·data-group-id="4798467447-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">132 </span><span·class="nf">stop</span><span·class="p"·data-group-id="5276444823-9">(</span><span·class="p"·data-group-id="5276444823-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
133 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">133 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">
  
134 </span><span·class="nf">foo</span><span·class="p"·data-group-id="4798467447-10">(</span><span·class="n">X</span><span·class="p"·data-group-id="4798467447-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">134 </span><span·class="nf">foo</span><span·class="p"·data-group-id="5276444823-10">(</span><span·class="n">X</span><span·class="p"·data-group-id="5276444823-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
135 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="4798467447-11">(</span><span·class="p"·data-group-id="4798467447-12">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="4798467447-12">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·b9bf7882ec94958aab561d119a3ee94addd1c238feea6d1ef8a9dad7b50b3a7b·...·]-11">)</span><span·class="p">.</span><span·class="w">135 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="5276444823-11">(</span><span·class="p"·data-group-id="5276444823-12">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="5276444823-12">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·6cf4ae3cd878fec03d9cbffc102db9bbf33834d05ac02eaaf4060d684369a477·...·]-11">)</span><span·class="p">.</span><span·class="w">
136 </span><span·class="nf">bar</span><span·class="p"·data-group-id="4798467447-13">(</span><span·class="n">Y</span><span·class="p"·data-group-id="4798467447-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">136 </span><span·class="nf">bar</span><span·class="p"·data-group-id="5276444823-13">(</span><span·class="n">Y</span><span·class="p"·data-group-id="5276444823-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
137 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="4798467447-14">(</span><span·class="p"·data-group-id="4798467447-15">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="4798467447-15">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·b9bf7882ec94958aab561d119a3ee94addd1c238feea6d1ef8a9dad7b50b3a7b·...·]-14">)</span><span·class="p">.</span><span·class="w">137 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="5276444823-14">(</span><span·class="p"·data-group-id="5276444823-15">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="5276444823-15">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·6cf4ae3cd878fec03d9cbffc102db9bbf33834d05ac02eaaf4060d684369a477·...·]-14">)</span><span·class="p">.</span><span·class="w">
  
138 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="4798467447-16">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="4798467447-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="5276444823-16">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="5276444823-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-17">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4798467447-18">(</span><span·class="p"·data-group-id="4798467447-18">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·04f4570cbee4e93cdb7eb066953f6b453f2e93bb5b1736da7e83d89c9d44636d·...·]-17">}</span><span·class="p">,</span><span·class="w">139 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-17">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="5276444823-18">(</span><span·class="p"·data-group-id="5276444823-18">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·ef907bf79deee8433fec3c139b20e1b4b11050e618a118d8fde2499fced757fe·...·]-17">}</span><span·class="p">,</span><span·class="w">
140 ····</span><span·class="k">receive</span><span·class="w">140 ····</span><span·class="k">receive</span><span·class="w">
141 »       </span><span·class="p"·data-group-id="4798467447-19">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="4798467447-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">141 »       </span><span·class="p"·data-group-id="5276444823-19">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="5276444823-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
142 »       ····</span><span·class="n">Result</span><span·class="w">142 »       ····</span><span·class="n">Result</span><span·class="w">
143 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">143 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
144 </span><span·class="nf">init</span><span·class="p"·data-group-id="4798467447-20">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="4798467447-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">144 </span><span·class="nf">init</span><span·class="p"·data-group-id="5276444823-20">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="5276444823-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
145 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="4798467447-21">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4798467447-22">(</span><span·class="p"·data-group-id="4798467447-22">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·f981fb0b6d46c83173c5e35330a497ccd6ab7d563b1b94ebd9e9b33db4262585·...·]-21">)</span><span·class="p">,</span><span·class="w">145 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="5276444823-21">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="5276444823-22">(</span><span·class="p"·data-group-id="5276444823-22">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·a1bf1547ffa4e38168b27d1918445741c0fbd223c56450ad302dbb4a39b0bcb2·...·]-21">)</span><span·class="p">,</span><span·class="w">
146 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="4798467447-23">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="4798467447-23">)</span><span·class="p">,</span><span·class="w">146 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="5276444823-23">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="5276444823-23">)</span><span·class="p">,</span><span·class="w">
147 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="4798467447-24">(</span><span·class="p"·data-group-id="4798467447-25">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="4798467447-25">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·389,·SHA:·64deac72211647f3f56fa7773e29daec57a97ab34f8527193fc35d8627faf777·...·]-24">)</span><span·class="p">,</span><span·class="w">147 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="5276444823-24">(</span><span·class="p"·data-group-id="5276444823-25">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="5276444823-25">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·389,·SHA:·b7bf7de5e3553ca38e7241d1036bb39f9ef76ead136b7b93643739f9b2117963·...·]-24">)</span><span·class="p">,</span><span·class="w">
148 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="4798467447-28">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4798467447-28">)</span><span·class="p">.</span><span·class="w">148 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="5276444823-28">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5276444823-28">)</span><span·class="p">.</span><span·class="w">
  
149 </span><span·class="nf">loop</span><span·class="p"·data-group-id="4798467447-29">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4798467447-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">149 </span><span·class="nf">loop</span><span·class="p"·data-group-id="5276444823-29">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5276444823-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
150 ····</span><span·class="k">receive</span><span·class="w">150 ····</span><span·class="k">receive</span><span·class="w">
151 »       </span><span·class="p"·data-group-id="4798467447-30">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="4798467447-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">151 »       </span><span·class="p"·data-group-id="5276444823-30">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5276444823-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
152 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-31">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4798467447-32">(</span><span·class="p"·data-group-id="4798467447-32">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-33">{</[·...·truncated·by·diffoscope;·len:·343,·SHA:·cb2b2e9472fe714608ae725f72089f20d1219a297e0093483a1803b2ebc0c061·...·]-31">}</span><span·class="p">,</span><span·class="w">152 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-31">{</span><span·class="nf">self</span><span·class="p"·data-group-id="5276444823-32">(</span><span·class="p"·data-group-id="5276444823-32">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-33">{</[·...·truncated·by·diffoscope;·len:·343,·SHA:·f2d49f9845efe00e0ad9ffaaa69711d284f1b1850d6ab73fa73ac704908b28f6·...·]-31">}</span><span·class="p">,</span><span·class="w">
153 »       ····</span><span·class="k">receive</span><span·class="w">153 »       ····</span><span·class="k">receive</span><span·class="w">
154 »       »       </span><span·class="p"·data-group-id="4798467447-35">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-36">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·371c97f4f32afc8b9f05ffe4d638e3534b96a676154dde6def08978a31c37637·...·]-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">154 »       »       </span><span·class="p"·data-group-id="5276444823-35">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-36">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·1da0ca719c22a955e10f7421f958d724a50ef5769ee70546304d04481b0fa051·...·]-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
155 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-37">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="4798467447-38">(</span><span·class="n">Data</span><span·class="p"·data-group-id="4798467447-3[·...·truncated·by·diffoscope;·len:·52,·SHA:·edca1c35b44421bd6d9d135947e8dad0e4f4abb78233f35ec2fb8c882c833f6c·...·]-37">}</span><span·class="w">155 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-37">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="5276444823-38">(</span><span·class="n">Data</span><span·class="p"·data-group-id="5276444823-3[·...·truncated·by·diffoscope;·len:·52,·SHA:·0e411916e0b85cebef5523c566cbaf234196fffad16faf69ef8d63290222e222·...·]-37">}</span><span·class="w">
156 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">156 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
157 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="4798467447-39">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4798467447-39">)</span><span·class="p">;</span><span·class="w">157 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="5276444823-39">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5276444823-39">)</span><span·class="p">;</span><span·class="w">
158 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">158 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
159 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4798467447-40">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4798467447-41">(</span><span·class="p"·data-group-id="4798467447-41">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·a76fa315b54ead21e96da616a08d3480b88303455d2c7da26a2a5e33bf18f0bb·...·]-40">}</span><span·class="p">,</span><span·class="w">159 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5276444823-40">{</span><span·class="nf">self</span><span·class="p"·data-group-id="5276444823-41">(</span><span·class="p"·data-group-id="5276444823-41">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·51c3509d06d9b2294f1e1c244a0ae521fb141f9065168ac58f96892382a1b109·...·]-40">}</span><span·class="p">,</span><span·class="w">
160 »       ····</span><span·class="k">receive</span><span·class="w">160 »       ····</span><span·class="k">receive</span><span·class="w">
161 »       »       </span><span·class="p"·data-group-id="4798467447-42">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="4798467447-42">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">161 »       »       </span><span·class="p"·data-group-id="5276444823-42">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="5276444823-42">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
162 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="4798467447-43">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="4798467447-43">)</span><span·class="w">162 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="5276444823-43">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="5276444823-43">)</span><span·class="w">
163 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">163 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
164 »       </span><span·class="p"·data-group-id="4798467447-44">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4798467447-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">164 »       </span><span·class="p"·data-group-id="5276444823-44">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5276444823-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
165 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="4798467447-45">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="4798467447-45">)</span><span·class="w">165 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="5276444823-45">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="5276444823-45">)</span><span·class="w">
166 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">166 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
167 </span><span·class="nf">encode</span><span·class="p"·data-group-id="4798467447-46">(</span><span·class="p"·data-group-id="4798467447-47">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="4798467447-47">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·232dcf9b338031b548c454c623daea0ce8c2ae9df27736cd7c76e9835d64a9c0·...·]-48">]</span><span·class="p">;</span><span·class="w">167 </span><span·class="nf">encode</span><span·class="p"·data-group-id="5276444823-46">(</span><span·class="p"·data-group-id="5276444823-47">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="5276444823-47">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·cd951505370f5cbd6c67fa30a43c6339ff10e6fc5b7e257791ecbdf584f6ff2c·...·]-48">]</span><span·class="p">;</span><span·class="w">
168 </span><span·class="nf">encode</span><span·class="p"·data-group-id="4798467447-49">(</span><span·class="p"·data-group-id="4798467447-50">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="4798467447-50">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·de7d10fdfdababc7ed131edf26e86374446b8ca2266f564f7232d75d7cfbd05a·...·]-51">]</span><span·class="p">.</span><span·class="w">168 </span><span·class="nf">encode</span><span·class="p"·data-group-id="5276444823-49">(</span><span·class="p"·data-group-id="5276444823-50">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="5276444823-50">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·296,·SHA:·a9a0af05ed857957384c43c060c30b178c91853b5045237ab86873591cd2172f·...·]-51">]</span><span·class="p">.</span><span·class="w">
  
169 </span><span·class="nf">decode</span><span·class="p"·data-group-id="4798467447-52">(</span><span·class="p"·data-group-id="4798467447-53">[</span><span·class="n">Int</span><span·class="p"·data-group-id="4798467447-53">]</span><span·class="p"·data-group-id="4798467447-52">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><p>There·are·two·differences·when·using·Erl_Interface·on·the·C·side·compared·to·the169 </span><span·class="nf">decode</span><span·class="p"·data-group-id="5276444823-52">(</span><span·class="p"·data-group-id="5276444823-53">[</span><span·class="n">Int</span><span·class="p"·data-group-id="5276444823-53">]</span><span·class="p"·data-group-id="5276444823-52">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Int</span><span·class="p">.</span></code></pre><p>There·are·two·differences·when·using·Erl_Interface·on·the·C·side·compared·to·the
170 example·in·<a·href="c_port.html">Ports</a>,·using·only·the·plain·port:</p><ul><li>As·Erl_Interface·operates·on·the·Erlang·external·term·format,·the·port·must·be170 example·in·<a·href="c_port.html">Ports</a>,·using·only·the·plain·port:</p><ul><li>As·Erl_Interface·operates·on·the·Erlang·external·term·format,·the·port·must·be
171 set·to·use·binaries.</li><li>Instead·of·inventing·an·encoding/decoding·scheme,·the171 set·to·use·binaries.</li><li>Instead·of·inventing·an·encoding/decoding·scheme,·the
172 <a·href="../../erts-15.2.6/doc/html/erlang.html#term_to_binary/1"><code·class="inline">term_to_binary/1</code></a>·and172 <a·href="../../erts-15.2.6/doc/html/erlang.html#term_to_binary/1"><code·class="inline">term_to_binary/1</code></a>·and
173 <a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>·BIFs·are·to·be·used.</li></ul><p>That·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">open_port</span><span·class="p"·data-group-id="2143173832-1">(</span><span·class="p"·data-group-id="2143173832-2">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="2143173832-2">}</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·2065,·SHA:·b425c9fdc75753fe8156e1be020c691ad851034635c0ab804502fe47b2ab055c·...·]-1">}</span><span·class="p">,</span><span·class="w">173 <a·href="../../erts-15.2.6/doc/html/erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>·BIFs·are·to·be·used.</li></ul><p>That·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">open_port</span><span·class="p"·data-group-id="9858871723-1">(</span><span·class="p"·data-group-id="9858871723-2">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="9858871723-2">}</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·2065,·SHA:·a2b1dc54766ab5b672fc1cedf718fe829c681cdffd6f7f92c31015167b030cb2·...·]-1">}</span><span·class="p">,</span><span·class="w">
174 </span><span·class="k">receive</span><span·class="w">174 </span><span·class="k">receive</span><span·class="w">
175 ··</span><span·class="p"·data-group-id="1136000244-5">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1136000244-6">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·ee0bb25eacebb66e63d02bbe02958f3abf19be0f283c626f5b201ea7f0036a6f·...·]-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 ··</span><span·class="p"·data-group-id="6481321945-5">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6481321945-6">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·8846df6838b087bd42173735c5ce41b73ae31fe6a1d6bd801e4d632c1e2df936·...·]-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1136000244-7">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="1136000244-8">(</span><span·class="n">Data</span><span·class="p"·data-group-id="1136000244-8">[·...·truncated·by·diffoscope;·len:·49,·SHA:·5424c228b25207630e5802438cfe02def57bf5fc391c2d9b3fba882090138cdc·...·]-7">}</span><span·class="w">176 ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6481321945-7">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">decode</span><span·class="p"·data-group-id="6481321945-8">(</span><span·class="n">Data</span><span·class="p"·data-group-id="6481321945-8">[·...·truncated·by·diffoscope;·len:·49,·SHA:·6e115d476e2f9a48ca9ec079276287569264704e52258bc2165845b9dc14e7a4·...·]-7">}</span><span·class="w">
177 </span><span·class="k">end</span></code></pre><p>is·replaced·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6682489976-1">{</span><span·class="nf">self</span><span·class="p"·data-group-id="6682489976-2">(</span><span·class="p"·data-group-id="6682489976-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6682489976-3">{</span[·...·truncated·by·diffoscope;·len:·344,·SHA:·d0f39c7ff4888485fa19025f0938c725eeb62d0ee9437727bed34f1374d592e5·...·]-1">}</span><span·class="p">,</span><span·class="w">177 </span><span·class="k">end</span></code></pre><p>is·replaced·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0896122103-1">{</span><span·class="nf">self</span><span·class="p"·data-group-id="0896122103-2">(</span><span·class="p"·data-group-id="0896122103-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0896122103-3">{</span[·...·truncated·by·diffoscope;·len:·344,·SHA:·e770371d2537a652be5fe44e9e2411a4def92c0fdd6918fa14470807f02531f9·...·]-1">}</span><span·class="p">,</span><span·class="w">
178 </span><span·class="k">receive</span><span·class="w">178 </span><span·class="k">receive</span><span·class="w">
179 ··</span><span·class="p"·data-group-id="6682489976-5">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6682489976-6">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·b8ab9fe607c4c0eae2b2eceffa292a0594333fd5b842cb1a7bcffabc1af7605d·...·]-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">179 ··</span><span·class="p"·data-group-id="0896122103-5">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0896122103-6">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·1eb018288e55a211efee01eea18b495d0e017d84caa99796e1195a02d0a88c33·...·]-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
180 ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6682489976-7">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="6682489976-8">(</span><span·class="n">Data</span><span·class="p"·data-group-id="668248[·...·truncated·by·diffoscope;·len:·57,·SHA:·34c6da797b268e22678f966a46aeb47b9274d33cdb183493816dfecab2235e39·...·]-7">}</span><span·class="w">180 ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0896122103-7">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="0896122103-8">(</span><span·class="n">Data</span><span·class="p"·data-group-id="089612[·...·truncated·by·diffoscope;·len:·57,·SHA:·31feba45f7565b118e4dc920097eefa4983f0f2d15a890f3291536e968517be9·...·]-7">}</span><span·class="w">
181 </span><span·class="k">end</span></code></pre><p>The·resulting·Erlang·program·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4451604354-1">(</span><span·class="ss">complex2</span><span·class="p"·data-group-id="4451604354-1">)</span><span·class="p">.</span><span·class="w">181 </span><span·class="k">end</span></code></pre><p>The·resulting·Erlang·program·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3829287376-1">(</span><span·class="ss">complex2</span><span·class="p"·data-group-id="3829287376-1">)</span><span·class="p">.</span><span·class="w">
182 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4451604354-2">(</span><span·class="p"·data-group-id="4451604354-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·2e50d19db97ee15ebac3d5e23726150d6b62130475f5067a64b273d039042145·...·]-2">)</span><span·class="p">.</span><span·class="w">182 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3829287376-2">(</span><span·class="p"·data-group-id="3829287376-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·241,·SHA:·afa9282c8525234f59817215b1158e114a8f1d69bede0510ed2452a7ad7054d6·...·]-2">)</span><span·class="p">.</span><span·class="w">
183 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4451604354-4">(</span><span·class="p"·data-group-id="4451604354-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·46998861ec0f8905fb8994cb93ed264b6660a76e6b813ea8fd8b61d66871674c·...·]-4">)</span><span·class="p">.</span><span·class="w">183 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3829287376-4">(</span><span·class="p"·data-group-id="3829287376-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·fb4a0dd123f3d7c48e48626057e7b1fe130f001fbbc7ae393c1067d0aa387d24·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
184 </span><span·class="nf">start</span><span·class="p"·data-group-id="4451604354-6">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="4451604354-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 </span><span·class="nf">start</span><span·class="p"·data-group-id="3829287376-6">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="3829287376-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4451604354-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-8">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·1434adb2d27081c2fc180a93dc74be3564ba028193fd617d6c830fd4f74df7a4·...·]-7">)</span><span·class="p">.</span><span·class="w">185 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="3829287376-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-8">[</span><spa[·...·truncated·by·diffoscope;·len:·119,·SHA:·660dd620070cdc75bde9a5f8b1eb7d8e5eaacbee5655f079614c35db3e383447·...·]-7">)</span><span·class="p">.</span><span·class="w">
186 </span><span·class="nf">stop</span><span·class="p"·data-group-id="4451604354-9">(</span><span·class="p"·data-group-id="4451604354-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">186 </span><span·class="nf">stop</span><span·class="p"·data-group-id="3829287376-9">(</span><span·class="p"·data-group-id="3829287376-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
187 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">187 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p">.</span><span·class="w">
  
188 </span><span·class="nf">foo</span><span·class="p"·data-group-id="4451604354-10">(</span><span·class="n">X</span><span·class="p"·data-group-id="4451604354-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">188 </span><span·class="nf">foo</span><span·class="p"·data-group-id="3829287376-10">(</span><span·class="n">X</span><span·class="p"·data-group-id="3829287376-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
189 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="4451604354-11">(</span><span·class="p"·data-group-id="4451604354-12">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="4451604354-12">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·a2d5e1fc534675dc46a0fd6424267a6700eabbac96c3358c0060dab88d0032b9·...·]-11">)</span><span·class="p">.</span><span·class="w">189 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="3829287376-11">(</span><span·class="p"·data-group-id="3829287376-12">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="3829287376-12">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·396c73c95fba1a3690e3db7534bd244b6759dee8b072f6261ad98cdbf033010d·...·]-11">)</span><span·class="p">.</span><span·class="w">
190 </span><span·class="nf">bar</span><span·class="p"·data-group-id="4451604354-13">(</span><span·class="n">Y</span><span·class="p"·data-group-id="4451604354-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">190 </span><span·class="nf">bar</span><span·class="p"·data-group-id="3829287376-13">(</span><span·class="n">Y</span><span·class="p"·data-group-id="3829287376-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
191 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="4451604354-14">(</span><span·class="p"·data-group-id="4451604354-15">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="4451604354-15">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·a2d5e1fc534675dc46a0fd6424267a6700eabbac96c3358c0060dab88d0032b9·...·]-14">)</span><span·class="p">.</span><span·class="w">191 ····</span><span·class="nf">call_port</span><span·class="p"·data-group-id="3829287376-14">(</span><span·class="p"·data-group-id="3829287376-15">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="3829287376-15">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·396c73c95fba1a3690e3db7534bd244b6759dee8b072f6261ad98cdbf033010d·...·]-14">)</span><span·class="p">.</span><span·class="w">
  
192 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="4451604354-16">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="4451604354-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 </span><span·class="nf">call_port</span><span·class="p"·data-group-id="3829287376-16">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="3829287376-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-17">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4451604354-18">(</span><span·class="p"·data-group-id="4451604354-18">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·75c7bf9cd1781bbf3842050c84a1d3dca64e55a55d21b768b2cc1750c06a952a·...·]-17">}</span><span·class="p">,</span><span·class="w">193 ····</span><span·class="ss">complex</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-17">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="3829287376-18">(</span><span·class="p"·data-group-id="3829287376-18">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·94,·SHA:·b343322e2f59b1dc1f911e10796fd70c076f596e5389d12e04e9359f693356f8·...·]-17">}</span><span·class="p">,</span><span·class="w">
194 ····</span><span·class="k">receive</span><span·class="w">194 ····</span><span·class="k">receive</span><span·class="w">
195 »       </span><span·class="p"·data-group-id="4451604354-19">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="4451604354-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">195 »       </span><span·class="p"·data-group-id="3829287376-19">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="3829287376-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
196 »       ····</span><span·class="n">Result</span><span·class="w">196 »       ····</span><span·class="n">Result</span><span·class="w">
197 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">197 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
198 </span><span·class="nf">init</span><span·class="p"·data-group-id="4451604354-20">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="4451604354-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 </span><span·class="nf">init</span><span·class="p"·data-group-id="3829287376-20">(</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="3829287376-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="4451604354-21">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4451604354-22">(</span><span·class="p"·data-group-id="4451604354-22">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·9cfa300e366b1bae2a26f45c0cae5266982885ae27b1bf0f8aedd707e55cb2f8·...·]-21">)</span><span·class="p">,</span><span·class="w">199 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="3829287376-21">(</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="3829287376-22">(</span><span·class="p"·data-group-id="3829287376-22">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·881ab4b30870068197fff922234b0c1c7a6108955116fe3a33b4a748c74cf545·...·]-21">)</span><span·class="p">,</span><span·class="w">
200 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="4451604354-23">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="4451604354-23">)</span><span·class="p">,</span><span·class="w">200 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="3829287376-23">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="3829287376-23">)</span><span·class="p">,</span><span·class="w">
201 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="4451604354-24">(</span><span·class="p"·data-group-id="4451604354-25">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="4451604354-25">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·467,·SHA:·e6e62165d3c740f8fbc456bc46d6c83aaef77f97d3232e1c7f5b6a8340030c1c·...·]-24">)</span><span·class="p">,</span><span·class="w">201 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="3829287376-24">(</span><span·class="p"·data-group-id="3829287376-25">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExtPrg</span><span·class="p"·data-group-id="3829287376-25">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·467,·SHA:·f4625291572f9e98be30e34da718a4a48ee81f47998c405fece96f0f1c0ca23b·...·]-24">)</span><span·class="p">,</span><span·class="w">
202 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="4451604354-28">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4451604354-28">)</span><span·class="p">.</span><span·class="w">202 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="3829287376-28">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3829287376-28">)</span><span·class="p">.</span><span·class="w">
  
203 </span><span·class="nf">loop</span><span·class="p"·data-group-id="4451604354-29">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4451604354-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">203 </span><span·class="nf">loop</span><span·class="p"·data-group-id="3829287376-29">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3829287376-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
204 ····</span><span·class="k">receive</span><span·class="w">204 ····</span><span·class="k">receive</span><span·class="w">
205 »       </span><span·class="p"·data-group-id="4451604354-30">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="4451604354-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 »       </span><span·class="p"·data-group-id="3829287376-30">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Caller</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="3829287376-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-31">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4451604354-32">(</span><span·class="p"·data-group-id="4451604354-32">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-33">{</[·...·truncated·by·diffoscope;·len:·351,·SHA:·070266513f4f9e3ad27531e8a04701ec5386a94101e33c97d4b4379c7fa90c9a·...·]-31">}</span><span·class="p">,</span><span·class="w">206 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-31">{</span><span·class="nf">self</span><span·class="p"·data-group-id="3829287376-32">(</span><span·class="p"·data-group-id="3829287376-32">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-33">{</[·...·truncated·by·diffoscope;·len:·351,·SHA:·6548298f27edfc8d42a39313e44fa47311e6eb76a4963fda5ae7074f68b5bfa9·...·]-31">}</span><span·class="p">,</span><span·class="w">
207 »       ····</span><span·class="k">receive</span><span·class="w">207 »       ····</span><span·class="k">receive</span><span·class="w">
208 »       »       </span><span·class="p"·data-group-id="4451604354-35">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-36">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·60ca2b9a55bdde4cc0c3b18b383b440811c91fc0404c5fb3e8dfe947b694c1c4·...·]-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 »       »       </span><span·class="p"·data-group-id="3829287376-35">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-36">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·b75fe5b18b04b764890cc3fc3760b7345a7cf85373a7b720d18beca5838c9eaa·...·]-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-37">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="4451604354-38">(</span><span·class="n">Data</span><span·class="p"·data-group-id="4451[·...·truncated·by·diffoscope;·len:·60,·SHA:·1b77167a949f603455921e51da6c9fa2169883e7d5be1fdfdbade2ad454f77d1·...·]-37">}</span><span·class="w">209 »       »       ····</span><span·class="n">Caller</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-37">{</span><span·class="ss">complex</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="3829287376-38">(</span><span·class="n">Data</span><span·class="p"·data-group-id="3829[·...·truncated·by·diffoscope;·len:·60,·SHA:·e28c26b2ebf19aaee2a25d355c5cbce350571f57af292453a28de4e455b5eee8·...·]-37">}</span><span·class="w">
210 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">210 »       ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
211 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="4451604354-39">(</span><span·class="n">Port</span><span·class="p"·data-group-id="4451604354-39">)</span><span·class="p">;</span><span·class="w">211 »       ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="3829287376-39">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3829287376-39">)</span><span·class="p">;</span><span·class="w">
212 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">212 »       </span><span·class="ss">stop</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
213 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4451604354-40">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4451604354-41">(</span><span·class="p"·data-group-id="4451604354-41">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·118dfde1e2924296cf7663ec1fe5ec81bb50dec2200ab68b2a0c755f8f6b805d·...·]-40">}</span><span·class="p">,</span><span·class="w">213 »       ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3829287376-40">{</span><span·class="nf">self</span><span·class="p"·data-group-id="3829287376-41">(</span><span·class="p"·data-group-id="3829287376-41">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">close</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·aebd783aee7538d0608fb508b8279b1bb2e98ea6e7c6af889ae9982ec009519c·...·]-40">}</span><span·class="p">,</span><span·class="w">
214 »       ····</span><span·class="k">receive</span><span·class="w">214 »       ····</span><span·class="k">receive</span><span·class="w">
215 »       »       </span><span·class="p"·data-group-id="4451604354-42">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="4451604354-42">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">215 »       »       </span><span·class="p"·data-group-id="3829287376-42">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="3829287376-42">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
216 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="4451604354-43">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="4451604354-43">)</span><span·class="w">216 »       »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="3829287376-43">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="3829287376-43">)</span><span·class="w">
217 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">217 »       ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
218 »       </span><span·class="p"·data-group-id="4451604354-44">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4451604354-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">218 »       </span><span·class="p"·data-group-id="3829287376-44">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="3829287376-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
219 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="4451604354-45">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="4451604354-45">)</span><span·class="w">219 »       ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="3829287376-45">(</span><span·class="ss">port_terminated</span><span·class="p"·data-group-id="3829287376-45">)</span><span·class="w">
220 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Notice·that·calling·<code·class="inline">complex2:foo/1</code>·and·<code·class="inline">complex2:bar/1</code>·results·in·the·tuple220 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Notice·that·calling·<code·class="inline">complex2:foo/1</code>·and·<code·class="inline">complex2:bar/1</code>·results·in·the·tuple
221 <code·class="inline">{foo,X}</code>·or·<code·class="inline">{bar,Y}</code>·being·sent·to·the·<code·class="inline">complex</code>·process,·which·codes·them·as221 <code·class="inline">{foo,X}</code>·or·<code·class="inline">{bar,Y}</code>·being·sent·to·the·<code·class="inline">complex</code>·process,·which·codes·them·as
222 binaries·and·sends·them·to·the·port.·This·means·that·the·C·program·must·be·able222 binaries·and·sends·them·to·the·port.·This·means·that·the·C·program·must·be·able
223 to·handle·these·two·tuples.</p><h2·id="c-program"·class="section-heading">223 to·handle·these·two·tuples.</p><h2·id="c-program"·class="section-heading">
224 ··<a·href="#c-program"·class="hover-link">224 ··<a·href="#c-program"·class="hover-link">
225 ····<i·class="ri-link-m"·aria-hidden="true"></i>225 ····<i·class="ri-link-m"·aria-hidden="true"></i>
226 ··</a>226 ··</a>
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362 ····-L/usr/local/otp/lib/erl_interface-3.9.2/lib·\362 ····-L/usr/local/otp/lib/erl_interface-3.9.2/lib·\
363 ····complex.c·erl_comm.c·ei.c·-lei·-lpthread</code></pre><p>In·Erlang/OTP·R5B·and·later·versions·of·OTP,·the·<code·class="inline">include</code>·and·<code·class="inline">lib</code>·directories363 ····complex.c·erl_comm.c·ei.c·-lei·-lpthread</code></pre><p>In·Erlang/OTP·R5B·and·later·versions·of·OTP,·the·<code·class="inline">include</code>·and·<code·class="inline">lib</code>·directories
364 are·situated·under·<code·class="inline">$OTPROOT/lib/erl_interface-VSN</code>,·where·<code·class="inline">$OTPROOT</code>·is·the364 are·situated·under·<code·class="inline">$OTPROOT/lib/erl_interface-VSN</code>,·where·<code·class="inline">$OTPROOT</code>·is·the
365 root·directory·of·the·OTP·installation·(<code·class="inline">/usr/local/otp</code>·in·the·recent·example)365 root·directory·of·the·OTP·installation·(<code·class="inline">/usr/local/otp</code>·in·the·recent·example)
366 and·<code·class="inline">VSN</code>·is·the·version·of·the·Erl_interface·application·(3.2.1·in·the·recent366 and·<code·class="inline">VSN</code>·is·the·version·of·the·Erl_interface·application·(3.2.1·in·the·recent
367 example).</p><p>In·R4B·and·earlier·versions·of·OTP,·<code·class="inline">include</code>·and·<code·class="inline">lib</code>·are·situated·under367 example).</p><p>In·R4B·and·earlier·versions·of·OTP,·<code·class="inline">include</code>·and·<code·class="inline">lib</code>·are·situated·under
368 <code·class="inline">$OTPROOT/usr</code>.</p><p><em>Step·2.</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">368 <code·class="inline">$OTPROOT/usr</code>.</p><p><em>Step·2.</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">
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143 reports·and·other·error·and·information·reports·are·by·default·logged·through143 reports·and·other·error·and·information·reports·are·by·default·logged·through
144 the·log·handler·which·is·set·up·when·the·Kernel·application·is·started.</p><p>Prior·to·Erlang/OTP·21.0,·supervisor,·crash,·and·progress·reports·were·only144 the·log·handler·which·is·set·up·when·the·Kernel·application·is·started.</p><p>Prior·to·Erlang/OTP·21.0,·supervisor,·crash,·and·progress·reports·were·only
145 logged·when·the·SASL·application·was·running.·This·behaviour·can,·for·backwards145 logged·when·the·SASL·application·was·running.·This·behaviour·can,·for·backwards
146 compatibility,·be·enabled·by·setting·the·Kernel·configuration·parameter146 compatibility,·be·enabled·by·setting·the·Kernel·configuration·parameter
147 <a·href="../../lib/kernel-10.2.6/doc/html/kernel_app.html#logger_sasl_compatible"><code·class="inline">logger_sasl_compatible</code></a>·to147 <a·href="../../lib/kernel-10.2.6/doc/html/kernel_app.html#logger_sasl_compatible"><code·class="inline">logger_sasl_compatible</code></a>·to
148 <code·class="inline">true</code>.·For·more·information,·see148 <code·class="inline">true</code>.·For·more·information,·see
149 <a·href="../../lib/sasl-4.2.2/doc/html/error_logging.html">SASL·Error·Logging</a>·in·the·SASL·User's·Guide.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-kernel·logger_level·info</span><span·class="w">149 <a·href="../../lib/sasl-4.2.2/doc/html/error_logging.html">SASL·Error·Logging</a>·in·the·SASL·User's·Guide.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-kernel·logger_level·info</span><span·class="w">
150 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">21</span><span·class="w">·</span><span·class="p"·data-group-id="9410482093-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">10.0</span><span·class="p"·data-group-id="9410482093-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="9410482093-2">[</span><span·class="ss">source<[·...·truncated·by·diffoscope;·len:·1313,·SHA:·b8f42f890404d304b0fdf20a4c15e546d7591f93b39d98377d9f1a899a067ee3·...·]-7">]</span><span·class="w">150 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">21</span><span·class="w">·</span><span·class="p"·data-group-id="0965617646-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">10.0</span><span·class="p"·data-group-id="0965617646-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="0965617646-2">[</span><span·class="ss">source<[·...·truncated·by·diffoscope;·len:·1313,·SHA:·fa70165d0362202ba8d6133837d23284728fa89b06f6eb2a0dc1c1f6e8640b15·...·]-7">]</span><span·class="w">
  
151 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.916404</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">151 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.916404</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
152 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">kernel</span><span·class="w">152 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">kernel</span><span·class="w">
153 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">153 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">
154 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.922908</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">154 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.922908</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
155 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stdlib</span><span·class="w">155 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stdlib</span><span·class="w">
156 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">156 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">
157 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.925755</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">157 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.925755</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
158 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9410482093-8">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">kernel_safe_sup</span><span·class="p"·data-group-id="9410482093-8">}</span><span·class="w">158 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="0965617646-8">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">kernel_safe_sup</span><span·class="p"·data-group-id="0965617646-8">}</span><span·class="w">
159 ····</span><span·class="nc">started</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9410482093-9">[</span><span·class="p"·data-group-id="9410482093-10">{</span><span·class="ss">pid</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.74</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·a8363a157e313150237c152976da74432af182faa4fbde0ebb6bdf619feaa49f·...·]-10">}</span><span·class="p">,</span><span·class="w">159 ····</span><span·class="nc">started</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="0965617646-9">[</span><span·class="p"·data-group-id="0965617646-10">{</span><span·class="ss">pid</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.74</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·e86eff283393b716815605850bb2b6b792205e4470e4670d70f66915744427b8·...·]-10">}</span><span·class="p">,</span><span·class="w">
160 ··············</span><span·class="p"·data-group-id="9410482093-11">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="ss">disk_log_sup</span><span·class="p"·data-group-id="9410482093-11">}</span><span·class="p">,</span><span·class="w">160 ··············</span><span·class="p"·data-group-id="0965617646-11">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="ss">disk_log_sup</span><span·class="p"·data-group-id="0965617646-11">}</span><span·class="p">,</span><span·class="w">
161 ··············</span><span·class="p"·data-group-id="9410482093-12">{</span><span·class="ss">mfargs</span><span·class="p">,</span><span·class="p"·data-group-id="9410482093-13">{</span><span·class="ss">disk_log_sup</span><span·class="p">,</span><span·class="ss">start_link</span><span·class="p">,</span><span·c[·...·truncated·by·diffoscope;·len:·196,·SHA:·3256529133c84ca1a31a184c63b287ed43cc0de3dcff7bf58f35c85c3531060e·...·]-12">}</span><span·class="p">,</span><span·class="w">161 ··············</span><span·class="p"·data-group-id="0965617646-12">{</span><span·class="ss">mfargs</span><span·class="p">,</span><span·class="p"·data-group-id="0965617646-13">{</span><span·class="ss">disk_log_sup</span><span·class="p">,</span><span·class="ss">start_link</span><span·class="p">,</span><span·c[·...·truncated·by·diffoscope;·len:·196,·SHA:·87a19d0870f3177f80cb388f4e67e834a17902806eeed6e9cfe3e6420ad76bf8·...·]-12">}</span><span·class="p">,</span><span·class="w">
162 ··············</span><span·class="p"·data-group-id="9410482093-15">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="ss">permanent</span><span·class="p"·data-group-id="9410482093-15">}</span><span·class="p">,</span><span·class="w">162 ··············</span><span·class="p"·data-group-id="0965617646-15">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="ss">permanent</span><span·class="p"·data-group-id="0965617646-15">}</span><span·class="p">,</span><span·class="w">
163 ··············</span><span·class="p"·data-group-id="9410482093-16">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="mi">1000</span><span·class="p"·data-group-id="9410482093-16">}</span><span·class="p">,</span><span·class="w">163 ··············</span><span·class="p"·data-group-id="0965617646-16">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="mi">1000</span><span·class="p"·data-group-id="0965617646-16">}</span><span·class="p">,</span><span·class="w">
164 ··············</span><span·class="p"·data-group-id="9410482093-17">{</span><span·class="ss">child_type</span><span·class="p">,</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="9410482093-17">}</span><span·class="p"·data-group-id="9410482093-9">]</span><span·class="w">164 ··············</span><span·class="p"·data-group-id="0965617646-17">{</span><span·class="ss">child_type</span><span·class="p">,</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="0965617646-17">}</span><span·class="p"·data-group-id="0965617646-9">]</span><span·class="w">
165 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.926056</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">165 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">8</span><span·class="o">-</span><span·class="n">Jun</span><span·class="o">-</span><span·class="mi">2018</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">54</span><span·class="p">:</span><span·class="mf">19.926056</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
166 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9410482093-18">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">kernel_safe_sup</span><span·class="p"·data-group-id="9410482093-18">}</span><span·class="w">166 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="0965617646-18">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">kernel_safe_sup</span><span·class="p"·data-group-id="0965617646-18">}</span><span·class="w">
167 ····</span><span·class="nc">started</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9410482093-19">[</span><span·class="p"·data-group-id="9410482093-20">{</span><span·class="ss">pid</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.75</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·388caabce24a7cf6be04deeab9920e1f75556cd834aa654923b4fecf6f39b1ce·...·]-20">}</span><span·class="p">,</span><span·class="w">167 ····</span><span·class="nc">started</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="0965617646-19">[</span><span·class="p"·data-group-id="0965617646-20">{</span><span·class="ss">pid</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.75</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·13f1c1b299d0dcb98d47cd1ed94758f80b43ee1a1db446694caa462204a09315·...·]-20">}</span><span·class="p">,</span><span·class="w">
168 ··············</span><span·class="p"·data-group-id="9410482093-21">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="ss">disk_log_server</span><span·class="p"·data-group-id="9410482093-21">}</span><span·class="p">,</span><span·class="w">168 ··············</span><span·class="p"·data-group-id="0965617646-21">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="ss">disk_log_server</span><span·class="p"·data-group-id="0965617646-21">}</span><span·class="p">,</span><span·class="w">
169 ··············</span><span·class="p"·data-group-id="9410482093-22">{</span><span·class="ss">mfargs</span><span·class="p">,</span><span·class="p"·data-group-id="9410482093-23">{</span><span·class="ss">disk_log_server</span><span·class="p">,</span><span·class="ss">start_link</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·199,·SHA:·a3465321ff23719c272f05fb1e4255dec8119c4bf8a642ee3181fd1f905b82ca·...·]-22">}</span><span·class="p">,</span><span·class="w">169 ··············</span><span·class="p"·data-group-id="0965617646-22">{</span><span·class="ss">mfargs</span><span·class="p">,</span><span·class="p"·data-group-id="0965617646-23">{</span><span·class="ss">disk_log_server</span><span·class="p">,</span><span·class="ss">start_link</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·199,·SHA:·23de6097bf1117752fa2fa61232c8e37f5be30fdba94b2b0288f99d31ffd8687·...·]-22">}</span><span·class="p">,</span><span·class="w">
170 ··············</span><span·class="p"·data-group-id="9410482093-25">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="ss">permanent</span><span·class="p"·data-group-id="9410482093-25">}</span><span·class="p">,</span><span·class="w">170 ··············</span><span·class="p"·data-group-id="0965617646-25">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="ss">permanent</span><span·class="p"·data-group-id="0965617646-25">}</span><span·class="p">,</span><span·class="w">
171 ··············</span><span·class="p"·data-group-id="9410482093-26">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="mi">2000</span><span·class="p"·data-group-id="9410482093-26">}</span><span·class="p">,</span><span·class="w">171 ··············</span><span·class="p"·data-group-id="0965617646-26">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="mi">2000</span><span·class="p"·data-group-id="0965617646-26">}</span><span·class="p">,</span><span·class="w">
172 ··············</span><span·class="p"·data-group-id="9410482093-27">{</span><span·class="ss">child_type</span><span·class="p">,</span><span·class="ss">worker</span><span·class="p"·data-group-id="9410482093-27">}</span><span·class="p"·data-group-id="9410482093-19">]</span><span·class="w">172 ··············</span><span·class="p"·data-group-id="0965617646-27">{</span><span·class="ss">child_type</span><span·class="p">,</span><span·class="ss">worker</span><span·class="p"·data-group-id="0965617646-27">}</span><span·class="p"·data-group-id="0965617646-19">]</span><span·class="w">
173 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">··</span><span·class="p"·data-group-id="9410482093-28">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="9410482093-28">)</span><span·class="w">173 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">··</span><span·class="p"·data-group-id="0965617646-28">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0965617646-28">)</span><span·class="w">
174 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre>174 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre>
175 </div>175 </div>
  
176 <div·class="bottom-actions"·id="bottom-actions">176 <div·class="bottom-actions"·id="bottom-actions">
177 ··<div·class="bottom-actions-item">177 ··<div·class="bottom-actions-item">
  
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220 ········Built·using220 ········Built·using
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224 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>224 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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151 classes,·with·different·origins.·The·<a·href="expressions.html#try">try</a>·expression·can151 classes,·with·different·origins.·The·<a·href="expressions.html#try">try</a>·expression·can
152 distinguish·between·the·different·classes,·whereas·the152 distinguish·between·the·different·classes,·whereas·the
153 <a·href="expressions.html#catch-and-throw">catch</a>·expression·cannot.·<code·class="inline">try</code>·and·<code·class="inline">catch</code>·are·described153 <a·href="expressions.html#catch-and-throw">catch</a>·expression·cannot.·<code·class="inline">try</code>·and·<code·class="inline">catch</code>·are·described
154 in·<a·href="expressions.html">Expressions</a>.</p><table><thead><tr><th·style="text-align:·left;"><em>Class</em></th><th·style="text-align:·left;"><em>Origin</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">error</code></td><td·style="text-align:·left;">Run-time·error,·for·example,·<code·class="inline">1+a</code>,·or·the·process·called·<a·href="../../erts-15.2.6/doc/html/erlang.html#error/1"><code·class="inline">error/1</code></a></td></tr><tr><td·style="text-align:·left;"><code·class="inline">exit</code></td><td·style="text-align:·left;">The·process·called·<a·href="../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a></td></tr><tr><td·style="text-align:·left;"><code·class="inline">throw</code></td><td·style="text-align:·left;">The·process·called·<a·href="../../erts-15.2.6/doc/html/erlang.html#throw/1"><code·class="inline">throw/1</code></a></td></tr></tbody></table><p><em>Table:·Exception·Classes.</em></p><p>All·of·the·above·exceptions·can·also·be·generated·by·calling·<a·href="../../erts-15.2.6/doc/html/erlang.html#raise/3"><code·class="inline">erlang:raise/3</code></a>.</p><p>An·exception·consists·of·its·class,·an·exit·reason·(see154 in·<a·href="expressions.html">Expressions</a>.</p><table><thead><tr><th·style="text-align:·left;"><em>Class</em></th><th·style="text-align:·left;"><em>Origin</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">error</code></td><td·style="text-align:·left;">Run-time·error,·for·example,·<code·class="inline">1+a</code>,·or·the·process·called·<a·href="../../erts-15.2.6/doc/html/erlang.html#error/1"><code·class="inline">error/1</code></a></td></tr><tr><td·style="text-align:·left;"><code·class="inline">exit</code></td><td·style="text-align:·left;">The·process·called·<a·href="../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a></td></tr><tr><td·style="text-align:·left;"><code·class="inline">throw</code></td><td·style="text-align:·left;">The·process·called·<a·href="../../erts-15.2.6/doc/html/erlang.html#throw/1"><code·class="inline">throw/1</code></a></td></tr></tbody></table><p><em>Table:·Exception·Classes.</em></p><p>All·of·the·above·exceptions·can·also·be·generated·by·calling·<a·href="../../erts-15.2.6/doc/html/erlang.html#raise/3"><code·class="inline">erlang:raise/3</code></a>.</p><p>An·exception·consists·of·its·class,·an·exit·reason·(see
155 <a·href="errors.html#exit_reasons">Exit·Reason</a>),·and·a·stack·trace·(which·aids·in·finding155 <a·href="errors.html#exit_reasons">Exit·Reason</a>),·and·a·stack·trace·(which·aids·in·finding
156 the·code·location·of·the·exception).</p><p>The·stack·trace·can·be·bound·to·a·variable·from·within·a·<code·class="inline">try</code>·expression·for156 the·code·location·of·the·exception).</p><p>The·stack·trace·can·be·bound·to·a·variable·from·within·a·<code·class="inline">try</code>·expression·for
157 any·exception·class,·or·as·part·of·the·exit·reason·when·a·run-time·error·is157 any·exception·class,·or·as·part·of·the·exit·reason·when·a·run-time·error·is
158 caught·by·a·<code·class="inline">catch</code>.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="9589200081-1">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="9589200081-2">{</span><span·class="ss">test</span><span·class="p">,</span><span·class="n">Stacktrace</span><span·class="p"·data-group-id="958[·...·truncated·by·diffoscope;·len:·453,·SHA:·6cf56b0c7b577a492a4ae2ddd5897a53de38739419bfb6c44a9851b13b3e0877·...·]-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Stacktrace</span><span·class="p">.</span><span·class="w">158 caught·by·a·<code·class="inline">catch</code>.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="2349931993-1">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2349931993-2">{</span><span·class="ss">test</span><span·class="p">,</span><span·class="n">Stacktrace</span><span·class="p"·data-group-id="234[·...·truncated·by·diffoscope;·len:·453,·SHA:·6a8030fcb65fa0dff991e2aafe04c4eff5d91de1b705dad45225c3ff7d404fd5·...·]-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Stacktrace</span><span·class="p">.</span><span·class="w">
159 </span><span·class="p"·data-group-id="9589200081-5">[</span><span·class="p"·data-group-id="9589200081-6">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">apply_fun</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·125,·SHA:·59a57ca050de765229ed9c0e4c6230d6e576fe726e9f339b3b0697642faaea1f·...·]-6">}</span><span·class="p">,</span><span·class="w">159 </span><span·class="p"·data-group-id="2349931993-5">[</span><span·class="p"·data-group-id="2349931993-6">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">apply_fun</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·125,·SHA:·67f6e2cbb1575426d7b55176e5c23f1e5e9cde7ad1d80eb54acc81da480b7bc2·...·]-6">}</span><span·class="p">,</span><span·class="w">
160 ·</span><span·class="p"·data-group-id="9589200081-8">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">do_apply</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="p"·data-group-id="9589200081-9">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·74,·SHA:·dd01e6f41c3f815594a6d546fbf95f189042d6e4a9922ea71f9788e9d6dca9e7·...·]-8">}</span><span·class="p">,</span><span·class="w">160 ·</span><span·class="p"·data-group-id="2349931993-8">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">do_apply</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="p"·data-group-id="2349931993-9">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·74,·SHA:·188389895695c613721fad501e19dd26b0adf3ee2a170124a3d9b7fcf489d590·...·]-8">}</span><span·class="p">,</span><span·class="w">
161 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9589200081-5">]</span><span·class="gp·unselectable">161 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2349931993-5">]</span><span·class="gp·unselectable">
162 &gt;·</span><span·class="k">try</span><span·class="w">·</span><span·class="nf">throw</span><span·class="p"·data-group-id="9589200081-10">(</span><span·class="ss">test</span><span·class="p"·data-group-id="9589200081-10">)</span><span·class="w">·</span><span·class="k">catch</span><span·class="w">·</span><span·class="n">Class</span><span·class="p">:</span><span·class="n">Reason</span><span·class="p">:</span><span·class="n">Stacktrace</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Stacktrace</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">162 &gt;·</span><span·class="k">try</span><span·class="w">·</span><span·class="nf">throw</span><span·class="p"·data-group-id="2349931993-10">(</span><span·class="ss">test</span><span·class="p"·data-group-id="2349931993-10">)</span><span·class="w">·</span><span·class="k">catch</span><span·class="w">·</span><span·class="n">Class</span><span·class="p">:</span><span·class="n">Reason</span><span·class="p">:</span><span·class="n">Stacktrace</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Stacktrace</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
163 </span><span·class="p"·data-group-id="9589200081-11">[</span><span·class="p"·data-group-id="9589200081-12">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">apply_fun</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·129,·SHA:·1288e53c260960be7ff78f34900611b1ef30d3ef4a489fe83d40ebbffb49130d·...·]-12">}</span><span·class="p">,</span><span·class="w">163 </span><span·class="p"·data-group-id="2349931993-11">[</span><span·class="p"·data-group-id="2349931993-12">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">apply_fun</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·129,·SHA:·9a077870c6184b16b35dd11e81053ab22f660633ba7a50ef285cc72eecf41b63·...·]-12">}</span><span·class="p">,</span><span·class="w">
164 ·</span><span·class="p"·data-group-id="9589200081-14">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">do_apply</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="p"·data-group-id="9589200081-15">[</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·77,·SHA:·0dfa033cdd8d1efb0aa0e6f2ebba771aa68356dae7e93102618a72aa54e91096·...·]-14">}</span><span·class="p">,</span><span·class="w">164 ·</span><span·class="p"·data-group-id="2349931993-14">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">do_apply</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="p"·data-group-id="2349931993-15">[</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·77,·SHA:·912c6e9e89ae3da8d91a71a7e7ff79f53319b35d8f05e98fbce1554456e4aa80·...·]-14">}</span><span·class="p">,</span><span·class="w">
165 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9589200081-11">]</span></code></pre><p><a·href=""·id="stacktrace"></a></p><h3·id="the-call-stack-back-trace-stacktrace"·class="section-heading">165 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2349931993-11">]</span></code></pre><p><a·href=""·id="stacktrace"></a></p><h3·id="the-call-stack-back-trace-stacktrace"·class="section-heading">
166 ··<a·href="#the-call-stack-back-trace-stacktrace"·class="hover-link">166 ··<a·href="#the-call-stack-back-trace-stacktrace"·class="hover-link">
167 ····<i·class="ri-link-m"·aria-hidden="true"></i>167 ····<i·class="ri-link-m"·aria-hidden="true"></i>
168 ··</a>168 ··</a>
169 ··<span·class="text">The·call-stack·back·trace·(stacktrace)</span>169 ··<span·class="text">The·call-stack·back·trace·(stacktrace)</span>
170 </h3>170 </h3>
171 <p>The·stack·back-trace·(<a·href="../../erts-15.2.6/doc/html/erlang.html#t:stacktrace/0"><em>stacktrace</em></a>)·is·a·list·that171 <p>The·stack·back-trace·(<a·href="../../erts-15.2.6/doc/html/erlang.html#t:stacktrace/0"><em>stacktrace</em></a>)·is·a·list·that
172 contains·<code·class="inline">{Module,·Function,·Arity,·ExtraInfo}</code>·and/or·<code·class="inline">{Fun,·Arity,·ExtraInfo}</code>172 contains·<code·class="inline">{Module,·Function,·Arity,·ExtraInfo}</code>·and/or·<code·class="inline">{Fun,·Arity,·ExtraInfo}</code>
Offset 283, 15 lines modifiedOffset 283, 15 lines modified
283 ······<p·class="built-using">283 ······<p·class="built-using">
284 ········Built·using284 ········Built·using
285 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the285 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
286 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>286 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
287 ······</p>287 ······</p>
288 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>288 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
289 ····</footer>289 ····</footer>
290 ··</div>290 ··</div>
291 </main>291 </main>
292 </div>292 </div>
293 <script>293 <script>
294 ··function·mermaidLoaded()·{294 ··function·mermaidLoaded()·{
295 ····mermaid.initialize({295 ····mermaid.initialize({
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135 event·handler.</p><h2·id="example"·class="section-heading">135 event·handler.</p><h2·id="example"·class="section-heading">
136 ··<a·href="#example"·class="hover-link">136 ··<a·href="#example"·class="hover-link">
137 ····<i·class="ri-link-m"·aria-hidden="true"></i>137 ····<i·class="ri-link-m"·aria-hidden="true"></i>
138 ··</a>138 ··</a>
139 ··<span·class="text">Example</span>139 ··<span·class="text">Example</span>
140 </h2>140 </h2>
141 <p>The·callback·module·for·the·event·handler·writing·error·messages·to·the·terminal141 <p>The·callback·module·for·the·event·handler·writing·error·messages·to·the·terminal
142 can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8423478775-1">(</span><span·class="ss">terminal_logger</span><span·class="p"·data-group-id="8423478775-1">)</span><span·class="p">.</span><span·class="w">142 can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8368904634-1">(</span><span·class="ss">terminal_logger</span><span·class="p"·data-group-id="8368904634-1">)</span><span·class="p">.</span><span·class="w">
143 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="8423478775-2">(</span><span·class="ss">gen_event</span><span·class="p"·data-group-id="8423478775-2">)</span><span·class="p">.</span><span·class="w">143 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="8368904634-2">(</span><span·class="ss">gen_event</span><span·class="p"·data-group-id="8368904634-2">)</span><span·class="p">.</span><span·class="w">
144 </span><span·class="w">144 </span><span·class="w">
145 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8423478775-3">(</span><span·class="p"·data-group-id="8423478775-4">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</sp[·...·truncated·by·diffoscope;·len:·252,·SHA:·76e8e83aff4e91f3322f47cf0a75f640deef17b24ab695721dc96904f46a3941·...·]-3">)</span><span·class="p">.</span><span·class="w">145 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8368904634-3">(</span><span·class="p"·data-group-id="8368904634-4">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</sp[·...·truncated·by·diffoscope;·len:·252,·SHA:·662ea162f5cf4206255cef950275ad1b379fbb0a50875a62f7e208938c85abfa·...·]-3">)</span><span·class="p">.</span><span·class="w">
  
146 </span><span·class="nf">init</span><span·class="p"·data-group-id="8423478775-5">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="8423478775-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">146 </span><span·class="nf">init</span><span·class="p"·data-group-id="8368904634-5">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="8368904634-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
147 ····</span><span·class="p"·data-group-id="8423478775-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8423478775-7">[</span><span·class="p"·data-group-id="8423478775-7">]</span><span·class="p"·data-group-id="8423478775-6">}</span><span·class="p">.</span><span·class="w">147 ····</span><span·class="p"·data-group-id="8368904634-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8368904634-7">[</span><span·class="p"·data-group-id="8368904634-7">]</span><span·class="p"·data-group-id="8368904634-6">}</span><span·class="p">.</span><span·class="w">
  
148 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="8423478775-8">(</span><span·class="n">ErrorMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8423478775-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">148 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="8368904634-8">(</span><span·class="n">ErrorMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8368904634-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
149 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8423478775-9">(</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8423478775-10">[</span><span·class[·...·truncated·by·diffoscope;·len:·115,·SHA:·939ccbe0e5c10b7e2af81103ab543ede3abf4ab878d745ddddaef43fad1604e3·...·]-9">)</span><span·class="p">,</span><span·class="w">149 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8368904634-9">(</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8368904634-10">[</span><span·class[·...·truncated·by·diffoscope;·len:·115,·SHA:·c6095af8e5b99af3d57c9689251eacf13099bcdc6de8d9e919f5d106eb297abe·...·]-9">)</span><span·class="p">,</span><span·class="w">
150 ····</span><span·class="p"·data-group-id="8423478775-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8423478775-11">}</span><span·class="p">.</span><span·class="w">150 ····</span><span·class="p"·data-group-id="8368904634-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8368904634-11">}</span><span·class="p">.</span><span·class="w">
  
151 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="8423478775-12">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">State</span><span·class="p"·data-group-id="8423478775-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">151 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="8368904634-12">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">State</span><span·class="p"·data-group-id="8368904634-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
152 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>The·callback·module·for·the·event·handler·writing·error·messages·to·a·file·can152 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>The·callback·module·for·the·event·handler·writing·error·messages·to·a·file·can
153 look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1967838294-1">(</span><span·class="ss">file_logger</span><span·class="p"·data-group-id="1967838294-1">)</span><span·class="p">.</span><span·class="w">153 look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2312160492-1">(</span><span·class="ss">file_logger</span><span·class="p"·data-group-id="2312160492-1">)</span><span·class="p">.</span><span·class="w">
154 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="1967838294-2">(</span><span·class="ss">gen_event</span><span·class="p"·data-group-id="1967838294-2">)</span><span·class="p">.</span><span·class="w">154 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="2312160492-2">(</span><span·class="ss">gen_event</span><span·class="p"·data-group-id="2312160492-2">)</span><span·class="p">.</span><span·class="w">
155 </span><span·class="w">155 </span><span·class="w">
156 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1967838294-3">(</span><span·class="p"·data-group-id="1967838294-4">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</s[·...·truncated·by·diffoscope;·len:·253,·SHA:·1d8bb8de7e7f7785c59ffce2854646d51d96230564cfd2b2cc65409cc300bccb·...·]-3">)</span><span·class="p">.</span><span·class="w">156 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2312160492-3">(</span><span·class="p"·data-group-id="2312160492-4">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</s[·...·truncated·by·diffoscope;·len:·253,·SHA:·04208de9793a4af6e8bc63d9a734ea5e3e7287ae938cc3e5c17c1846d5a66d40·...·]-3">)</span><span·class="p">.</span><span·class="w">
  
157 </span><span·class="nf">init</span><span·class="p"·data-group-id="1967838294-5">(</span><span·class="n">File</span><span·class="p"·data-group-id="1967838294-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">init</span><span·class="p"·data-group-id="2312160492-5">(</span><span·class="n">File</span><span·class="p"·data-group-id="2312160492-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="p"·data-group-id="1967838294-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1967838294-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·267,·SHA:·9d15b836799b8c2318136393a283e4d16ed919edf43d395676e87cdcd8013c82·...·]-7">)</span><span·class="p">,</span><span·class="w">158 ····</span><span·class="p"·data-group-id="2312160492-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="2312160492-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·267,·SHA:·5d2584110d7de227ef497f592d44f8d92f97761aafa5af222d68e0be1d7eeabc·...·]-7">)</span><span·class="p">,</span><span·class="w">
159 ····</span><span·class="p"·data-group-id="1967838294-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1967838294-8">}</span><span·class="p">.</span><span·class="w">159 ····</span><span·class="p"·data-group-id="2312160492-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="2312160492-8">}</span><span·class="p">.</span><span·class="w">
  
160 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="1967838294-9">(</span><span·class="n">ErrorMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1967838294-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">160 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2312160492-9">(</span><span·class="n">ErrorMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="2312160492-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
161 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1967838294-10">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·190,·SHA:·f4522a92f2e789eee74cac2c2a21f16620736554c9ade5acb6af87206f6ab4c3·...·]-10">)</span><span·class="p">,</span><span·class="w">161 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2312160492-10">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·190,·SHA:·837ba32c27cd4e9eff6719730ba0ebcccfcfd3540f5c36e2db378a744f79e344·...·]-10">)</span><span·class="p">,</span><span·class="w">
162 ····</span><span·class="p"·data-group-id="1967838294-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1967838294-12">}</span><span·class="p">.</span><span·class="w">162 ····</span><span·class="p"·data-group-id="2312160492-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="2312160492-12">}</span><span·class="p">.</span><span·class="w">
  
163 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="1967838294-13">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1967838294-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">163 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="2312160492-13">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="2312160492-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
164 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1967838294-14">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="1967838294-14">)</span><span·class="p">.</span></code></pre><p>The·code·is·explained·in·the·next·sections.</p><p><a·href=""·id="mgr"></a></p><h2·id="starting-an-event-manager"·class="section-heading">164 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="2312160492-14">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="2312160492-14">)</span><span·class="p">.</span></code></pre><p>The·code·is·explained·in·the·next·sections.</p><p><a·href=""·id="mgr"></a></p><h2·id="starting-an-event-manager"·class="section-heading">
165 ··<a·href="#starting-an-event-manager"·class="hover-link">165 ··<a·href="#starting-an-event-manager"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">Starting·an·Event·Manager</span>168 ··<span·class="text">Starting·an·Event·Manager</span>
169 </h2>169 </h2>
170 <p>To·start·an·event·manager·for·handling·errors,·as·described·in·the·previous170 <p>To·start·an·event·manager·for·handling·errors,·as·described·in·the·previous
171 example,·call·the·following·function:</p><pre><code·class="text">gen_event:start_link({local,·error_man})</code></pre><p><a·href="../../lib/stdlib-6.2.2/doc/html/gen_event.html#start_link/1"><code·class="inline">gen_event:start_link/1</code></a>·spawns·and·links·to·a·new·event·manager·process.</p><p>The·argument,·<code·class="inline">{local,·error_man}</code>,·specifies·the·name·under·which·the171 example,·call·the·following·function:</p><pre><code·class="text">gen_event:start_link({local,·error_man})</code></pre><p><a·href="../../lib/stdlib-6.2.2/doc/html/gen_event.html#start_link/1"><code·class="inline">gen_event:start_link/1</code></a>·spawns·and·links·to·a·new·event·manager·process.</p><p>The·argument,·<code·class="inline">{local,·error_man}</code>,·specifies·the·name·under·which·the
Offset 184, 57 lines modifiedOffset 184, 57 lines modified
184 manager·that·is·not·part·of·a·supervision·tree.</p><h2·id="adding-an-event-handler"·class="section-heading">184 manager·that·is·not·part·of·a·supervision·tree.</p><h2·id="adding-an-event-handler"·class="section-heading">
185 ··<a·href="#adding-an-event-handler"·class="hover-link">185 ··<a·href="#adding-an-event-handler"·class="hover-link">
186 ····<i·class="ri-link-m"·aria-hidden="true"></i>186 ····<i·class="ri-link-m"·aria-hidden="true"></i>
187 ··</a>187 ··</a>
188 ··<span·class="text">Adding·an·Event·Handler</span>188 ··<span·class="text">Adding·an·Event·Handler</span>
189 </h2>189 </h2>
190 <p>The·following·example·shows·how·to·start·an·event·manager·and·add·an·event190 <p>The·following·example·shows·how·to·start·an·event·manager·and·add·an·event
191 handler·to·it·by·using·the·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3085669858-1">(</span><span·class="p"·data-group-id="3085669858-2">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">error_man</span><span·class="p"·data-group-id="3085669858-2">}</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·bc0f798818be37c4e7f938e5e8881a4c1dbf7883e7238371b9404d9e126c2bc2·...·]-1">)</span><span·class="p">.</span><span·class="w">191 handler·to·it·by·using·the·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5616660383-1">(</span><span·class="p"·data-group-id="5616660383-2">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">error_man</span><span·class="p"·data-group-id="5616660383-2">}</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·1fa87ee3326d0a2873002add144b8a75d0906953fb4232aebc4c49966c3a0ddd·...·]-1">)</span><span·class="p">.</span><span·class="w">
192 </span><span·class="p"·data-group-id="3085669858-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3085669858-3">}</span><span·class="gp·unselectable">192 </span><span·class="p"·data-group-id="5616660383-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="5616660383-3">}</span><span·class="gp·unselectable">
193 2&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="3085669858-4">(</span><span·class="ss">error_man</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminal_logger</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3085669858-5">[</span><span·class="[·...·truncated·by·diffoscope;·len:·81,·SHA:·194ab1659a3f0cd5e84c26b53b186e3cabebc9058cf09a69fe206b9ac2dcf236·...·]-4">)</span><span·class="p">.</span><span·class="w">193 2&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="5616660383-4">(</span><span·class="ss">error_man</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminal_logger</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5616660383-5">[</span><span·class="[·...·truncated·by·diffoscope;·len:·81,·SHA:·0f7880ab8046caa78c6d501c781e381b2da7f09b8ad0b8119e9abaca5ea77d97·...·]-4">)</span><span·class="p">.</span><span·class="w">
194 </span><span·class="ss">ok</span></code></pre><p>This·function·sends·a·message·to·the·event·manager·registered·as·<code·class="inline">error_man</code>,194 </span><span·class="ss">ok</span></code></pre><p>This·function·sends·a·message·to·the·event·manager·registered·as·<code·class="inline">error_man</code>,
195 telling·it·to·add·the·event·handler·<code·class="inline">terminal_logger</code>.·The·event·manager·calls195 telling·it·to·add·the·event·handler·<code·class="inline">terminal_logger</code>.·The·event·manager·calls
196 the·callback·function·<code·class="inline">terminal_logger:init([])</code>,·where·the·argument·<code·class="inline">[]</code>·is·the196 the·callback·function·<code·class="inline">terminal_logger:init([])</code>,·where·the·argument·<code·class="inline">[]</code>·is·the
197 third·argument·to·<code·class="inline">add_handler</code>.·<code·class="inline">init/1</code>·is·expected·to·return·<code·class="inline">{ok,·State}</code>,197 third·argument·to·<code·class="inline">add_handler</code>.·<code·class="inline">init/1</code>·is·expected·to·return·<code·class="inline">{ok,·State}</code>,
198 where·<code·class="inline">State</code>·is·the·internal·state·of·the·event·handler.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="6041019452-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="6041019452-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
199 ····</span><span·class="p"·data-group-id="6041019452-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6041019452-3">[</span><span·class="p"·data-group-id="6041019452-3">]</span><span·class=[·...·truncated·by·diffoscope;·len:·180,·SHA:·2d57ee90a5e36ce8de4bc0f29a748748da13939cc4d5cc3f36e506a1abeb4e56·...·]198 where·<code·class="inline">State</code>·is·the·internal·state·of·the·event·handler.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="3417607983-1">(</span><span·class="p">_</span><span·class="n">[·...·truncated·by·diffoscope;·len:·132,·SHA:·db3c65ea896e749e8ff147b28483e5f487d07e259771a33612533875b793440f·...·]
 199 ····</span><span·class="p"·data-group-id="3417607983-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3417607983-3">[</span><span·class="p"·data-group-id="3417607983-3">]</span><span·class="p"·data-group-id="3417607983-2">}</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">init/1</code>·does·not·need·any·input·data·and·ignores·its·argument.·For
200 <code·class="inline">terminal_logger</code>,·the·internal·state·is·not·used.·For·<code·class="inline">file_logger</code>,·the200 <code·class="inline">terminal_logger</code>,·the·internal·state·is·not·used.·For·<code·class="inline">file_logger</code>,·the
201 internal·state·is·used·to·save·the·open·file·descriptor.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="0636183619-1">(</span><span·class="n">File</span><span·class="p"·data-group-id="0636183619-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">201 internal·state·is·used·to·save·the·open·file·descriptor.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="3301974433-1">(</span><span·class="n">File</span><span·class="p"·data-group-id="3301974433-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
202 ····</span><span·class="p"·data-group-id="0636183619-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="0636183619-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·267,·SHA:·6c30f8ad878a544781df4847348cee0b7b2450eb0d272ca0f6f5d2a911a406a7·...·]-3">)</span><span·class="p">,</span><span·class="w">202 ····</span><span·class="p"·data-group-id="3301974433-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="3301974433-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·267,·SHA:·f9c8b805c910ed20b9b861a90caeb98e564f02ff953fb21525e4bbe258966156·...·]-3">)</span><span·class="p">,</span><span·class="w">
203 ····</span><span·class="p"·data-group-id="0636183619-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="0636183619-4">}</span><span·class="p">.</span></code></pre><h2·id="notifying-about-events"·class="section-heading">203 ····</span><span·class="p"·data-group-id="3301974433-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="3301974433-4">}</span><span·class="p">.</span></code></pre><h2·id="notifying-about-events"·class="section-heading">
204 ··<a·href="#notifying-about-events"·class="hover-link">204 ··<a·href="#notifying-about-events"·class="hover-link">
205 ····<i·class="ri-link-m"·aria-hidden="true"></i>205 ····<i·class="ri-link-m"·aria-hidden="true"></i>
206 ··</a>206 ··</a>
207 ··<span·class="text">Notifying·about·Events</span>207 ··<span·class="text">Notifying·about·Events</span>
208 </h2>208 </h2>
209 <pre><code·class="text">3&gt;·gen_event:notify(error_man,·no_reply).209 <pre><code·class="text">3&gt;·gen_event:notify(error_man,·no_reply).
210 ***Error***·no_reply210 ***Error***·no_reply
211 ok</code></pre><p><code·class="inline">error_man</code>·is·the·name·of·the·event·manager·and·<code·class="inline">no_reply</code>·is·the·event.</p><p>The·event·is·made·into·a·message·and·sent·to·the·event·manager.·When·the·event211 ok</code></pre><p><code·class="inline">error_man</code>·is·the·name·of·the·event·manager·and·<code·class="inline">no_reply</code>·is·the·event.</p><p>The·event·is·made·into·a·message·and·sent·to·the·event·manager.·When·the·event
212 is·received,·the·event·manager·calls·<code·class="inline">handle_event(Event,·State)</code>·for·each212 is·received,·the·event·manager·calls·<code·class="inline">handle_event(Event,·State)</code>·for·each
213 installed·event·handler,·in·the·same·order·as·they·were·added.·The·function·is213 installed·event·handler,·in·the·same·order·as·they·were·added.·The·function·is
214 expected·to·return·a·tuple·<code·class="inline">{ok,State1}</code>,·where·<code·class="inline">State1</code>·is·a·new·value·for·the214 expected·to·return·a·tuple·<code·class="inline">{ok,State1}</code>,·where·<code·class="inline">State1</code>·is·a·new·value·for·the
215 state·of·the·event·handler.</p><p>In·<code·class="inline">terminal_logger</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_event</span><span·class="p"·data-group-id="1030713820-1">(</span><span·class="n">ErrorMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1030713820-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
216 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1030713820-2">(</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1030713820-3">[</span><span·class="n">ErrorMsg</span><span·class="p"·data-group-id="1030713820-3">]</span><span·class="p"·data-group-id="1030713820-2">)</span><span·class="p">,</span><span·class="w"> 
217 ····</span><span·class="p"·data-group-id="1030713820-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1030713820-4">}</span><span·class="p">.</span></code></pre>[·...·truncated·by·diffoscope;·len:·332,·SHA:·622963756eefcd0ab28d4b33ec3ef75da2cce7f8ec2b835d7d8c32f40915132e·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">215 state·of·the·event·handler.</p><p>In·<code·class="inline">terminal_logger</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_event</span><span·class="p"·data-group-id="0891757981-1">(</span><span·class="n">ErrorMsg</span><sp[·...·truncated·by·diffoscope;·len:·114,·SHA:·9fbc48a07512ebba086462bca86e7687ac9d01ba269371d689b604e56cb5c580·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
 216 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0891757981-2">(</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0891757981-3">[</span><span·class="n">ErrorMsg</span><span·class="p"·data-group-id="0891757981-3">]</span><span·class="p"·data-group-id="0891757981-2">)</span><span·class="p">,</span><span·class="w">
 217 ····</span><span·class="p"·data-group-id="0891757981-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="0891757981-4">}</span><span·class="p">.</span></code></pre><p>In·<code·class="inline">file_logger</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_event</span><span·class="p"·data-group-id="4225809851-1">(</span><span·class="n">ErrorMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4225809851-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
218 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1323664767-2">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·187,·SHA:·ce02ab3a0644afed0d00ef3816255e1df9801d38adf3fce02fbe76f4be340b50·...·]-2">)</span><span·class="p">,</span><span·class="w">218 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4225809851-2">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;***Error***·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·187,·SHA:·4a0714544d46b323d858c9e10f528a91addc946163f74eaf4019a7dd26b6215c·...·]-2">)</span><span·class="p">,</span><span·class="w">
219 ····</span><span·class="p"·data-group-id="1323664767-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1323664767-4">}</span><span·class="p">.</span></code></pre><h2·id="deleting-an-event-handler"·class="section-heading">219 ····</span><span·class="p"·data-group-id="4225809851-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4225809851-4">}</span><span·class="p">.</span></code></pre><h2·id="deleting-an-event-handler"·class="section-heading">
220 ··<a·href="#deleting-an-event-handler"·class="hover-link">220 ··<a·href="#deleting-an-event-handler"·class="hover-link">
221 ····<i·class="ri-link-m"·aria-hidden="true"></i>221 ····<i·class="ri-link-m"·aria-hidden="true"></i>
222 ··</a>222 ··</a>
223 ··<span·class="text">Deleting·an·Event·Handler</span>223 ··<span·class="text">Deleting·an·Event·Handler</span>
224 </h2>224 </h2>
225 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">delete_handler</span><span·class="p"·data-group-id="4640372104-1">(</span><span·class="ss">error_man</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminal_logger</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4640372104-2">[</span><span·class="[·...·truncated·by·diffoscope;·len:·81,·SHA:·9cb2beb3db07398e299f7f9228cdba64c95a5b46a436d9c48ef5f2faf240b8b8·...·]-1">)</span><span·class="p">.</span><span·class="w">225 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">delete_handler</span><span·class="p"·data-group-id="0381645200-1">(</span><span·class="ss">error_man</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminal_logger</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0381645200-2">[</span><span·class="[·...·truncated·by·diffoscope;·len:·81,·SHA:·fe1fdeaaf851d818c846393002e4cc2f61c6c76ecfc63d42bd9e54034ab89fba·...·]-1">)</span><span·class="p">.</span><span·class="w">
226 </span><span·class="ss">ok</span></code></pre><p>This·function·sends·a·message·to·the·event·manager·registered·as·<code·class="inline">error_man</code>,226 </span><span·class="ss">ok</span></code></pre><p>This·function·sends·a·message·to·the·event·manager·registered·as·<code·class="inline">error_man</code>,
227 telling·it·to·delete·the·event·handler·<code·class="inline">terminal_logger</code>.·The·event·manager227 telling·it·to·delete·the·event·handler·<code·class="inline">terminal_logger</code>.·The·event·manager
228 calls·the·callback·function·<code·class="inline">terminal_logger:terminate([],·State)</code>,·where·the228 calls·the·callback·function·<code·class="inline">terminal_logger:terminate([],·State)</code>,·where·the
229 argument·<code·class="inline">[]</code>·is·the·third·argument·to·<code·class="inline">delete_handler</code>.·<code·class="inline">terminate/2</code>·is·to·be229 argument·<code·class="inline">[]</code>·is·the·third·argument·to·<code·class="inline">delete_handler</code>.·<code·class="inline">terminate/2</code>·is·to·be
230 the·opposite·of·<code·class="inline">init/1</code>·and·do·any·necessary·cleaning·up.·Its·return·value·is230 the·opposite·of·<code·class="inline">init/1</code>·and·do·any·necessary·cleaning·up.·Its·return·value·is
231 ignored.</p><p>For·<code·class="inline">terminal_logger</code>,·no·cleaning·up·is·necessary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">terminate</span><span·class="p"·data-group-id="3303181944-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">State</span><span·class="p"·data-group-id="3303181944-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
232 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>For·<code·class="inline">file_logger</code>,·the·file·descriptor·opened·in·<code·class="inline">init</code>·must·be·closed:</p><pre><code·class="makeup·erlang"·translate="no"><spa[·...·truncated·by·diffoscope;·len:·247,·SHA:·274c8261c84e8b7deeb1d167e85e4d8c66cba0e81f8597f3c825cfafbfe6c93a·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 ignored.</p><p>For·<code·class="inline">terminal_logger</code>,·no·cleaning·up·is·necessary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">terminate</span><span·class="p"·data-group-id="4018483044-1">(</span><span·class="p">_</span><s[·...·truncated·by·diffoscope;·len:·166,·SHA:·f4d068b347c0663375949f429448b6f5e1770d41ceebc44d6a783540847bcddb·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
 232 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>For·<code·class="inline">file_logger</code>,·the·file·descriptor·opened·in·<code·class="inline">init</code>·must·be·closed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">terminate</span><span·class="p"·data-group-id="2038777355-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="2038777355-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
233 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="4500734070-2">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="4500734070-2">)</span><span·class="p">.</span></code></pre><h2·id="stopping"·class="section-heading">233 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="2038777355-2">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="2038777355-2">)</span><span·class="p">.</span></code></pre><h2·id="stopping"·class="section-heading">
234 ··<a·href="#stopping"·class="hover-link">234 ··<a·href="#stopping"·class="hover-link">
235 ····<i·class="ri-link-m"·aria-hidden="true"></i>235 ····<i·class="ri-link-m"·aria-hidden="true"></i>
236 ··</a>236 ··</a>
237 ··<span·class="text">Stopping</span>237 ··<span·class="text">Stopping</span>
238 </h2>238 </h2>
239 <p>When·an·event·manager·is·stopped,·it·gives·each·of·the·installed·event·handlers239 <p>When·an·event·manager·is·stopped,·it·gives·each·of·the·installed·event·handlers
240 the·chance·to·clean·up·by·calling·<code·class="inline">terminate/2</code>,·the·same·way·as·when·deleting·a240 the·chance·to·clean·up·by·calling·<code·class="inline">terminate/2</code>,·the·same·way·as·when·deleting·a
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249 this·is·done·is·defined·by·a·<a·href="sup_princ.html#shutdown">shutdown·strategy</a>·set·in249 this·is·done·is·defined·by·a·<a·href="sup_princ.html#shutdown">shutdown·strategy</a>·set·in
250 the·supervisor.</p><h3·id="standalone-event-managers"·class="section-heading">250 the·supervisor.</p><h3·id="standalone-event-managers"·class="section-heading">
251 ··<a·href="#standalone-event-managers"·class="hover-link">251 ··<a·href="#standalone-event-managers"·class="hover-link">
252 ····<i·class="ri-link-m"·aria-hidden="true"></i>252 ····<i·class="ri-link-m"·aria-hidden="true"></i>
253 ··</a>253 ··</a>
254 ··<span·class="text">Standalone·Event·Managers</span>254 ··<span·class="text">Standalone·Event·Managers</span>
255 </h3>255 </h3>
256 <p>An·event·manager·can·also·be·stopped·by·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9583532969-1">(</span><span·class="ss">error_man</span><span·class="p"·data-group-id="9583532969-1">)</span><span·class="p">.</span><span·class="w">256 <p>An·event·manager·can·also·be·stopped·by·calling:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="2829479125-1">(</span><span·class="ss">error_man</span><span·class="p"·data-group-id="2829479125-1">)</span><span·class="p">.</span><span·class="w">
257 </span><span·class="ss">ok</span></code></pre><h2·id="handling-other-messages"·class="section-heading">257 </span><span·class="ss">ok</span></code></pre><h2·id="handling-other-messages"·class="section-heading">
258 ··<a·href="#handling-other-messages"·class="hover-link">258 ··<a·href="#handling-other-messages"·class="hover-link">
259 ····<i·class="ri-link-m"·aria-hidden="true"></i>259 ····<i·class="ri-link-m"·aria-hidden="true"></i>
260 ··</a>260 ··</a>
261 ··<span·class="text">Handling·Other·Messages</span>261 ··<span·class="text">Handling·Other·Messages</span>
262 </h2>262 </h2>
263 <p>If·the·<code·class="inline">gen_event</code>·process·is·to·be·able·to·receive·other·messages263 <p>If·the·<code·class="inline">gen_event</code>·process·is·to·be·able·to·receive·other·messages
264 than·events,·the·callback·function·<code·class="inline">handle_info(Info,·State)</code>·must·be264 than·events,·the·callback·function·<code·class="inline">handle_info(Info,·State)</code>·must·be
265 implemented·to·handle·them.·Examples·of·other·messages·are·exit265 implemented·to·handle·them.·Examples·of·other·messages·are·exit
266 messages·if·the·event·manager·is·linked·to·other·processes·than·the266 messages·if·the·event·manager·is·linked·to·other·processes·than·the
267 supervisor·(for·example·via·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_event.html#add_sup_handler/3"><code·class="inline">gen_event:add_sup_handler/3</code></a>)·and·is267 supervisor·(for·example·via·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_event.html#add_sup_handler/3"><code·class="inline">gen_event:add_sup_handler/3</code></a>)·and·is
268 trapping·exit·signals.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_info</span><span·class="p"·data-group-id="3022386676-1">(</span><span·class="p"·data-group-id="3022386676-2">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason[·...·truncated·by·diffoscope;·len:·177,·SHA:·ff4b2147837db6ef0be8f44dbc7b755878fad74e1d8f9aa0241b318ed89a720f·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">268 trapping·exit·signals.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_info</span><span·class="p"·data-group-id="3566870149-1">(</span><span·class="p"·data-group-id="3566870149-2">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason[·...·truncated·by·diffoscope;·len:·177,·SHA:·a264f0081a85ece5d1e14982bc401b1b0ba5246f062a3322f1e56af6bba57405·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
269 ····</span><span·class="c1">%%·Code·to·handle·exits·here.</span><span·class="w">269 ····</span><span·class="c1">%%·Code·to·handle·exits·here.</span><span·class="w">
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131 int·bar(int·y)·{131 int·bar(int·y)·{
132 ··return·y*2;132 ··return·y*2;
133 }</code></pre><p>The·functions·are·deliberately·kept·as·simple·as·possible,·for·readability133 }</code></pre><p>The·functions·are·deliberately·kept·as·simple·as·possible,·for·readability
134 reasons.</p><p>From·an·Erlang·perspective,·it·is·preferable·to·be·able·to·call·<code·class="inline">foo</code>·and·<code·class="inline">bar</code>134 reasons.</p><p>From·an·Erlang·perspective,·it·is·preferable·to·be·able·to·call·<code·class="inline">foo</code>·and·<code·class="inline">bar</code>
135 without·having·to·bother·about·that·they·are·C·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·Erlang·code</span><span·class="w">135 without·having·to·bother·about·that·they·are·C·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·Erlang·code</span><span·class="w">
136 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">136 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
137 </span><span·class="n">Res</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">complex</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="5172538592-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="5172538592-1">)</span><span·class="p">,</span><span·class="w">137 </span><span·class="n">Res</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">complex</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="5980398830-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="5980398830-1">)</span><span·class="p">,</span><span·class="w">
138 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Here,·the·communication·with·C·is·hidden·in·the·implementation·of·<code·class="inline">complex.erl</code>.138 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Here,·the·communication·with·C·is·hidden·in·the·implementation·of·<code·class="inline">complex.erl</code>.
139 In·the·following·sections,·it·is·shown·how·this·module·can·be·implemented·using139 In·the·following·sections,·it·is·shown·how·this·module·can·be·implemented·using
140 the·different·interoperability·mechanisms.</p>140 the·different·interoperability·mechanisms.</p>
141 </div>141 </div>
  
142 <div·class="bottom-actions"·id="bottom-actions">142 <div·class="bottom-actions"·id="bottom-actions">
143 ··<div·class="bottom-actions-item">143 ··<div·class="bottom-actions-item">
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185 ······<p·class="built-using">185 ······<p·class="built-using">
186 ········Built·using186 ········Built·using
187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
189 ······</p>189 ······</p>
190 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>190 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
191 ····</footer>191 ····</footer>
192 ··</div>192 ··</div>
193 </main>193 </main>
194 </div>194 </div>
195 <script>195 <script>
196 ··function·mermaidLoaded()·{196 ··function·mermaidLoaded()·{
197 ····mermaid.initialize({197 ····mermaid.initialize({
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235 ······<p·class="built-using">235 ······<p·class="built-using">
236 ········Built·using236 ········Built·using
237 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the237 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
238 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>238 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
239 ······</p>239 ······</p>
240 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>240 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
241 ····</footer>241 ····</footer>
242 ··</div>242 ··</div>
243 </main>243 </main>
244 </div>244 </div>
245 <script>245 <script>
246 ··function·mermaidLoaded()·{246 ··function·mermaidLoaded()·{
247 ····mermaid.initialize({247 ····mermaid.initialize({
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157 ··<a·href="#example"·class="hover-link">157 ··<a·href="#example"·class="hover-link">
158 ····<i·class="ri-link-m"·aria-hidden="true"></i>158 ····<i·class="ri-link-m"·aria-hidden="true"></i>
159 ··</a>159 ··</a>
160 ··<span·class="text">Example</span>160 ··<span·class="text">Example</span>
161 </h2>161 </h2>
162 <p>An·example·of·a·simple·server·written·in·plain·Erlang·is·provided·in162 <p>An·example·of·a·simple·server·written·in·plain·Erlang·is·provided·in
163 <a·href="design_principles.html#ch1">Overview</a>.·The·server·can·be·reimplemented·using163 <a·href="design_principles.html#ch1">Overview</a>.·The·server·can·be·reimplemented·using
164 <code·class="inline">gen_server</code>,·resulting·in·this·callback·module:</p><p><a·href=""·id="ex"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3810252063-1">(</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3810252063-1">)</span><span·class="p">.</span><span·class="w">164 <code·class="inline">gen_server</code>,·resulting·in·this·callback·module:</p><p><a·href=""·id="ex"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2267012627-1">(</span><span·class="ss">ch3</span><span·class="p"·data-group-id="2267012627-1">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="3810252063-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="3810252063-2">)</span><span·class="p">.</span><span·class="w">165 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="2267012627-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="2267012627-2">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="w">166 </span><span·class="w">
167 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3810252063-3">(</span><span·class="p"·data-group-id="3810252063-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3810252063-4">]</span><span·class="p"·data-group-id="3810252063-3">)</span><span·class="p">.</span><span·class="w">167 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2267012627-3">(</span><span·class="p"·data-group-id="2267012627-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2267012627-4">]</span><span·class="p"·data-group-id="2267012627-3">)</span><span·class="p">.</span><span·class="w">
168 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3810252063-5">(</span><span·class="p"·data-group-id="3810252063-6">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·8443fbe56d66f5e46023877cfc64b518d5195adb69e399d52f92ddeda7f9cc5d·...·]-5">)</span><span·class="p">.</span><span·class="w">168 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2267012627-5">(</span><span·class="p"·data-group-id="2267012627-6">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·b21f1eae8f2d9f3e51828c49985e894eb7da8135f8bfa1fbc880f654a210098a·...·]-5">)</span><span·class="p">.</span><span·class="w">
169 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3810252063-7">(</span><span·class="p"·data-group-id="3810252063-8">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</sp[·...·truncated·by·diffoscope;·len:·254,·SHA:·5af63f5e63dad1047fd0fadd5bb26e39cfd90bbf83157d129fd39c0772d1ed87·...·]-7">)</span><span·class="p">.</span><span·class="w">169 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2267012627-7">(</span><span·class="p"·data-group-id="2267012627-8">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</sp[·...·truncated·by·diffoscope;·len:·254,·SHA:·d6575a343ce24aaeb04918edf72f526388a33c649bb59885643764aa5a68f9c5·...·]-7">)</span><span·class="p">.</span><span·class="w">
  
170 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="3810252063-9">(</span><span·class="p"·data-group-id="3810252063-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">170 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="2267012627-9">(</span><span·class="p"·data-group-id="2267012627-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
171 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="3810252063-10">(</span><span·class="p"·data-group-id="3810252063-11">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3810252063-11">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·407,·SHA:·527600b8a017e1e0a55a355ebd988e990f9d571196ea866988d1569e88c99aa6·...·]-10">)</span><span·class="p">.</span><span·class="w">171 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="2267012627-10">(</span><span·class="p"·data-group-id="2267012627-11">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="2267012627-11">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·407,·SHA:·861fa00ac50d5fa312bf854b41163f4f29198a865b6e1eae6f697ca284af7e48·...·]-10">)</span><span·class="p">.</span><span·class="w">
  
172 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="3810252063-14">(</span><span·class="p"·data-group-id="3810252063-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="2267012627-14">(</span><span·class="p"·data-group-id="2267012627-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3810252063-15">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="3810252063-15">)</span><span·class="p">.</span><span·class="w">173 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="2267012627-15">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="2267012627-15">)</span><span·class="p">.</span><span·class="w">
  
174 </span><span·class="nf">free</span><span·class="p"·data-group-id="3810252063-16">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="3810252063-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">174 </span><span·class="nf">free</span><span·class="p"·data-group-id="2267012627-16">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="2267012627-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
175 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="3810252063-17">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3810252063-18">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><sp[·...·truncated·by·diffoscope;·len:·92,·SHA:·21cd866fb92a62910111f52cffbd2fde77dece1ed03e864bb1d912fe2c1085b2·...·]-17">)</span><span·class="p">.</span><span·class="w">175 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="2267012627-17">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2267012627-18">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><sp[·...·truncated·by·diffoscope;·len:·92,·SHA:·47b009f6895382f8ceaeee3a310876bf183b8918231f67886f83856a879e0621·...·]-17">)</span><span·class="p">.</span><span·class="w">
  
176 </span><span·class="nf">init</span><span·class="p"·data-group-id="3810252063-19">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="3810252063-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 </span><span·class="nf">init</span><span·class="p"·data-group-id="2267012627-19">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="2267012627-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ····</span><span·class="p"·data-group-id="3810252063-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="3810252063-21">(</span><span·class="p"·data-group-id="3810252063-21">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·a94e14f0bc71089b21e69345e3cebb93de4be44bf6488bf3ae7e7f98033b99d9·...·]-20">}</span><span·class="p">.</span><span·class="w">177 ····</span><span·class="p"·data-group-id="2267012627-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="2267012627-21">(</span><span·class="p"·data-group-id="2267012627-21">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·c24b3ba010528d33bd2b6d0d1d1d657c5e7a8c64ea187c6e553205b5e1b9fa25·...·]-20">}</span><span·class="p">.</span><span·class="w">
  
178 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3810252063-22">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·2f0b8278a835eb6a9c6fc33d0e2682665a722143c637805798fc3cccd31aee11·...·]-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="2267012627-22">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·96a418f042616248ee483dc82699b79e6dd3e50482937bb6aae2c8222309f88d·...·]-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ····</span><span·class="p"·data-group-id="3810252063-23">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3810252063-23">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·143,·SHA:·5d4a0a5474f805781415a13aa3dae943a91d128ab67755111c47a4efda5872be·...·]-24">)</span><span·class="p">,</span><span·class="w">179 ····</span><span·class="p"·data-group-id="2267012627-23">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="2267012627-23">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·143,·SHA:·b721bba4a9a52d22510bdd4f626fdd5aa1f392ab7f251059a5ff057b08a305b9·...·]-24">)</span><span·class="p">,</span><span·class="w">
180 ····</span><span·class="p"·data-group-id="3810252063-25">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3810252063-25">}</span><span·class="p">.</span><span·class="w">180 ····</span><span·class="p"·data-group-id="2267012627-25">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="2267012627-25">}</span><span·class="p">.</span><span·class="w">
  
181 </span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="3810252063-26">(</span><span·class="p"·data-group-id="3810252063-27">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="3810252063-27">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·e9635c205be6ec6a1e89a9d6b52aefb00abcbac404308578d8606d6dbefe01c7·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">181 </span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="2267012627-26">(</span><span·class="p"·data-group-id="2267012627-27">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="2267012627-27">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·a1ea884494559593e9a372408b3a0f5bf2b55deaf727701fbc3f519fb0c9b743·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
182 ····</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="3810252063-28">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="3810252063-28">)</span><span·class="p">,</span><span·class="w">182 ····</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="2267012627-28">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="2267012627-28">)</span><span·class="p">,</span><span·class="w">
183 ····</span><span·class="p"·data-group-id="3810252063-29">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3810252063-29">}</span><span·class="p">.</span></code></pre><p>The·code·is·explained·in·the·next·sections.</p><h2·id="starting-a-gen_server"·class="section-heading">183 ····</span><span·class="p"·data-group-id="2267012627-29">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="2267012627-29">}</span><span·class="p">.</span></code></pre><p>The·code·is·explained·in·the·next·sections.</p><h2·id="starting-a-gen_server"·class="section-heading">
184 ··<a·href="#starting-a-gen_server"·class="hover-link">184 ··<a·href="#starting-a-gen_server"·class="hover-link">
185 ····<i·class="ri-link-m"·aria-hidden="true"></i>185 ····<i·class="ri-link-m"·aria-hidden="true"></i>
186 ··</a>186 ··</a>
187 ··<span·class="text">Starting·a·Gen_Server</span>187 ··<span·class="text">Starting·a·Gen_Server</span>
188 </h2>188 </h2>
189 <p>In·the·example·in·the·previous·section,·<code·class="inline">gen_server</code>·is·started·by·calling189 <p>In·the·example·in·the·previous·section,·<code·class="inline">gen_server</code>·is·started·by·calling
190 <code·class="inline">ch3:start_link()</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start_link</span><span·class="p"·data-group-id="5795780719-1">(</span><span·class="p"·data-group-id="5795780719-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">190 <code·class="inline">ch3:start_link()</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start_link</span><span·class="p"·data-group-id="1981349979-1">(</span><span·class="p"·data-group-id="1981349979-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
191 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="5795780719-2">(</span><span·class="p"·data-group-id="5795780719-3">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="5795780719-3">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·681,·SHA:·5f8810516423932533289f92c925569bf2f369cf574ba7e0e1494b3f51deb68d·...·]9-6">}</span></code></pre><p><code·class="inline">start_link/0</code>·calls·function·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/4</code></a>.··This·function191 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="1981349979-2">(</span><span·class="p"·data-group-id="1981349979-3">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="1981349979-3">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·681,·SHA:·9b60b433e6cacd8f8aa735665f2d61c43e89d8526c396844df9197eba22678f6·...·]9-6">}</span></code></pre><p><code·class="inline">start_link/0</code>·calls·function·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/4</code></a>.··This·function
192 spawns·and·links·to·a·new·process,·a·<code·class="inline">gen_server</code>.</p><ul><li><p>The·first·argument,·<code·class="inline">{local,·ch3}</code>,·specifies·the·name.192 spawns·and·links·to·a·new·process,·a·<code·class="inline">gen_server</code>.</p><ul><li><p>The·first·argument,·<code·class="inline">{local,·ch3}</code>,·specifies·the·name.
193 The·gen_server·is·then·locally·registered·as·<code·class="inline">ch3</code>.</p><p>If·the·name·is·omitted,·the·<code·class="inline">gen_server</code>·is·not·registered.·Instead·its·pid193 The·gen_server·is·then·locally·registered·as·<code·class="inline">ch3</code>.</p><p>If·the·name·is·omitted,·the·<code·class="inline">gen_server</code>·is·not·registered.·Instead·its·pid
194 must·be·used.·The·name·can·also·be·given·as·<code·class="inline">{global,·Name}</code>,·in·which·case194 must·be·used.·The·name·can·also·be·given·as·<code·class="inline">{global,·Name}</code>,·in·which·case
195 the·<code·class="inline">gen_server</code>·is·registered·using·<a·href="../../lib/kernel-10.2.6/doc/html/global.html#register_name/2"><code·class="inline">global:register_name/2</code></a>.</p></li><li><p>The·second·argument,·<code·class="inline">ch3</code>,·is·the·name·of·the·callback·module,·which·is195 the·<code·class="inline">gen_server</code>·is·registered·using·<a·href="../../lib/kernel-10.2.6/doc/html/global.html#register_name/2"><code·class="inline">global:register_name/2</code></a>.</p></li><li><p>The·second·argument,·<code·class="inline">ch3</code>,·is·the·name·of·the·callback·module,·which·is
196 the·module·where·the·callback·functions·are·located.</p><p>The·interface·functions·(<code·class="inline">start_link/0</code>,·<code·class="inline">alloc/0</code>,·and·<code·class="inline">free/1</code>)·are·located196 the·module·where·the·callback·functions·are·located.</p><p>The·interface·functions·(<code·class="inline">start_link/0</code>,·<code·class="inline">alloc/0</code>,·and·<code·class="inline">free/1</code>)·are·located
197 in·the·same·module·as·the·callback·functions·(<code·class="inline">init/1</code>,·<code·class="inline">handle_call/3</code>,·and197 in·the·same·module·as·the·callback·functions·(<code·class="inline">init/1</code>,·<code·class="inline">handle_call/3</code>,·and
198 <code·class="inline">handle_cast/2</code>).·It·is·usually·good·programming·practice·to·have·the·code198 <code·class="inline">handle_cast/2</code>).·It·is·usually·good·programming·practice·to·have·the·code
199 corresponding·to·one·process·contained·in·a·single·module.</p></li><li><p>The·third·argument,·<code·class="inline">[]</code>,·is·a·term·that·is·passed·as·is·to·the·callback199 corresponding·to·one·process·contained·in·a·single·module.</p></li><li><p>The·third·argument,·<code·class="inline">[]</code>,·is·a·term·that·is·passed·as·is·to·the·callback
200 function·<code·class="inline">init</code>.·Here,·<code·class="inline">init</code>·does·not·need·any·indata·and·ignores·the200 function·<code·class="inline">init</code>.·Here,·<code·class="inline">init</code>·does·not·need·any·indata·and·ignores·the
201 argument.</p></li><li><p>The·fourth·argument,·<code·class="inline">[]</code>,·is·a·list·of·options.·See·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>201 argument.</p></li><li><p>The·fourth·argument,·<code·class="inline">[]</code>,·is·a·list·of·options.·See·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>
202 for·the·available·options.</p></li></ul><p>If·name·registration·succeeds,·the·new·<code·class="inline">gen_server</code>·process·calls·the·callback202 for·the·available·options.</p></li></ul><p>If·name·registration·succeeds,·the·new·<code·class="inline">gen_server</code>·process·calls·the·callback
203 function·<code·class="inline">ch3:init([])</code>.·<code·class="inline">init</code>·is·expected·to·return·<code·class="inline">{ok,·State}</code>,·where203 function·<code·class="inline">ch3:init([])</code>.·<code·class="inline">init</code>·is·expected·to·return·<code·class="inline">{ok,·State}</code>,·where
204 <code·class="inline">State</code>·is·the·internal·state·of·the·<code·class="inline">gen_server</code>.·In·this·case,·the·state·is204 <code·class="inline">State</code>·is·the·internal·state·of·the·<code·class="inline">gen_server</code>.·In·this·case,·the·state·is
205 the·available·channels.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="3672299631-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="3672299631-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 the·available·channels.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="5172714567-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="5172714567-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 ····</span><span·class="p"·data-group-id="3672299631-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="3672299631-3">(</span><span·class="p"·data-group-id="3672299631-3">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·f39e359c61a58549929a6edbc7efaf6caa8de57e57d9228da23e4578854593ca·...·]-2">}</span><span·class="p">.</span></code></pre><p><a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/4</code></a>·is·synchronous.·It·does·not·return·until·the206 ····</span><span·class="p"·data-group-id="5172714567-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="5172714567-3">(</span><span·class="p"·data-group-id="5172714567-3">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·199c121daf69421b5683bc0297bc66544554b873603c5cb67272a8c178382729·...·]-2">}</span><span·class="p">.</span></code></pre><p><a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/4</code></a>·is·synchronous.·It·does·not·return·until·the
207 <code·class="inline">gen_server</code>·has·been·initialized·and·is·ready·to·receive·requests.</p><p><a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/4</code></a>·must·be·used·if·the·<code·class="inline">gen_server</code>·is·part·of207 <code·class="inline">gen_server</code>·has·been·initialized·and·is·ready·to·receive·requests.</p><p><a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/4</code></a>·must·be·used·if·the·<code·class="inline">gen_server</code>·is·part·of
208 a·supervision·tree,·meaning·that·it·was·started·by·a·supervisor.·There208 a·supervision·tree,·meaning·that·it·was·started·by·a·supervisor.·There
209 is·another·function,·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start/4"><code·class="inline">gen_server:start/4</code></a>,·to·start·a·standalone209 is·another·function,·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start/4"><code·class="inline">gen_server:start/4</code></a>,·to·start·a·standalone
210 <code·class="inline">gen_server</code>·that·is·not·part·of·a·supervision·tree.</p><h2·id="synchronous-requests-call"·class="section-heading">210 <code·class="inline">gen_server</code>·that·is·not·part·of·a·supervision·tree.</p><h2·id="synchronous-requests-call"·class="section-heading">
211 ··<a·href="#synchronous-requests-call"·class="hover-link">211 ··<a·href="#synchronous-requests-call"·class="hover-link">
212 ····<i·class="ri-link-m"·aria-hidden="true"></i>212 ····<i·class="ri-link-m"·aria-hidden="true"></i>
213 ··</a>213 ··</a>
Offset 221, 32 lines modifiedOffset 221, 32 lines modified
221 </h2>221 </h2>
222 <p>The·synchronous·request·<code·class="inline">alloc()</code>·is·implemented·using·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#call/2"><code·class="inline">gen_server:call/2</code></a>:</p><pre><code·class="text">alloc()·-&gt;222 <p>The·synchronous·request·<code·class="inline">alloc()</code>·is·implemented·using·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#call/2"><code·class="inline">gen_server:call/2</code></a>:</p><pre><code·class="text">alloc()·-&gt;
223 ····gen_server:call(ch3,·alloc).</code></pre><p><code·class="inline">ch3</code>·is·the·name·of·the·<code·class="inline">gen_server</code>·and·must·agree·with·the·name223 ····gen_server:call(ch3,·alloc).</code></pre><p><code·class="inline">ch3</code>·is·the·name·of·the·<code·class="inline">gen_server</code>·and·must·agree·with·the·name
224 used·to·start·it.·<code·class="inline">alloc</code>·is·the·actual·request.</p><p>The·request·is·made·into·a·message·and·sent·to·the·<code·class="inline">gen_server</code>.224 used·to·start·it.·<code·class="inline">alloc</code>·is·the·actual·request.</p><p>The·request·is·made·into·a·message·and·sent·to·the·<code·class="inline">gen_server</code>.
225 When·the·request·is·received,·the·<code·class="inline">gen_server</code>·calls225 When·the·request·is·received,·the·<code·class="inline">gen_server</code>·calls
226 <code·class="inline">handle_call(Request,·From,·State)</code>,·which·is·expected·to·return226 <code·class="inline">handle_call(Request,·From,·State)</code>,·which·is·expected·to·return
227 a·tuple·<code·class="inline">{reply,Reply,State1}</code>.·<code·class="inline">Reply</code>·is·the·reply·that·is·to·be·sent·back227 a·tuple·<code·class="inline">{reply,Reply,State1}</code>.·<code·class="inline">Reply</code>·is·the·reply·that·is·to·be·sent·back
228 to·the·client,·and·<code·class="inline">State1</code>·is·a·new·value·for·the·state·of·the·<code·class="inline">gen_server</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_call</span><span·class="p"·data-group-id="7067371812-1">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="7[·...·truncated·by·diffoscope;·len:·9,·SHA:·2b7c6be421cc4a2ab15a983fe2c30838c606c107a582890321b67925639fac0b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">228 to·the·client,·and·<code·class="inline">State1</code>·is·a·new·value·for·the·state·of·the·<code·class="inline">gen_server</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_call</span><span·class="p"·data-group-id="9053945135-1">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="9[·...·truncated·by·diffoscope;·len:·9,·SHA:·1bb5a4fdf28b0b233930433d5a87de4885e724ba4222b0c6bf1902b59bdcb9af·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
229 ····</span><span·class="p"·data-group-id="7067371812-2">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="7067371812-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·140,·SHA:·f44e3adedd1e8a64289bdea3b8fd16bd600a5b06e7b17a40134f58681d037dbe·...·]-3">)</span><span·class="p">,</span><span·class="w">229 ····</span><span·class="p"·data-group-id="9053945135-2">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="9053945135-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·140,·SHA:·0c32bf6a94f9c5ba1bcc3bc9ba988a1de2f568b2432d4ffc1f1bf774d3046846·...·]-3">)</span><span·class="p">,</span><span·class="w">
230 ····</span><span·class="p"·data-group-id="7067371812-4">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="7067371812-4">}</span><span·class="p">.</span></code></pre><p>In·this·case,·the·reply·is·the·allocated·channel·<code·class="inline">Ch</code>·and·the·new·state·is·the230 ····</span><span·class="p"·data-group-id="9053945135-4">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="9053945135-4">}</span><span·class="p">.</span></code></pre><p>In·this·case,·the·reply·is·the·allocated·channel·<code·class="inline">Ch</code>·and·the·new·state·is·the
231 set·of·remaining·available·channels·<code·class="inline">Chs2</code>.</p><p>Thus,·the·call·<code·class="inline">ch3:alloc()</code>·returns·the·allocated·channel·<code·class="inline">Ch</code>·and·the231 set·of·remaining·available·channels·<code·class="inline">Chs2</code>.</p><p>Thus,·the·call·<code·class="inline">ch3:alloc()</code>·returns·the·allocated·channel·<code·class="inline">Ch</code>·and·the
232 <code·class="inline">gen_server</code>·then·waits·for·new·requests,·now·with·an·updated·list·of232 <code·class="inline">gen_server</code>·then·waits·for·new·requests,·now·with·an·updated·list·of
233 available·channels.</p><h2·id="asynchronous-requests-cast"·class="section-heading">233 available·channels.</p><h2·id="asynchronous-requests-cast"·class="section-heading">
234 ··<a·href="#asynchronous-requests-cast"·class="hover-link">234 ··<a·href="#asynchronous-requests-cast"·class="hover-link">
235 ····<i·class="ri-link-m"·aria-hidden="true"></i>235 ····<i·class="ri-link-m"·aria-hidden="true"></i>
236 ··</a>236 ··</a>
237 ··<span·class="text">Asynchronous·Requests·-·Cast</span>237 ··<span·class="text">Asynchronous·Requests·-·Cast</span>
238 </h2>238 </h2>
239 <p>The·asynchronous·request·<code·class="inline">free(Ch)</code>·is·implemented·using·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#cast/2"><code·class="inline">gen_server:cast/2</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">free</span><span·class="p"·data-group-id="8020750345-1">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="8020750345-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">239 <p>The·asynchronous·request·<code·class="inline">free(Ch)</code>·is·implemented·using·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#cast/2"><code·class="inline">gen_server:cast/2</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">free</span><span·class="p"·data-group-id="4826694327-1">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="4826694327-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
240 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="8020750345-2">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8020750345-3">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span[·...·truncated·by·diffoscope;·len:·89,·SHA:·481b1cc77c75256e602ff44c40e2f53a2bf8944de0025b44ab3fa3d7ba271f65·...·]-2">)</span><span·class="p">.</span></code></pre><p><code·class="inline">ch3</code>·is·the·name·of·the·<code·class="inline">gen_server</code>.·<code·class="inline">{free,·Ch}</code>·is·the·actual·request.</p><p>The·request·is·made·into·a·message·and·sent·to·the·<code·class="inline">gen_server</code>.240 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="4826694327-2">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4826694327-3">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span[·...·truncated·by·diffoscope;·len:·89,·SHA:·812b4b42a2fcacbd5dd88edb1c7dead9ba30ad799a35054dbc4ce05e7f993842·...·]-2">)</span><span·class="p">.</span></code></pre><p><code·class="inline">ch3</code>·is·the·name·of·the·<code·class="inline">gen_server</code>.·<code·class="inline">{free,·Ch}</code>·is·the·actual·request.</p><p>The·request·is·made·into·a·message·and·sent·to·the·<code·class="inline">gen_server</code>.
241 <code·class="inline">cast</code>,·and·thus·<code·class="inline">free</code>,·then·returns·<code·class="inline">ok</code>.</p><p>When·the·request·is·received,·the·<code·class="inline">gen_server</code>·calls241 <code·class="inline">cast</code>,·and·thus·<code·class="inline">free</code>,·then·returns·<code·class="inline">ok</code>.</p><p>When·the·request·is·received,·the·<code·class="inline">gen_server</code>·calls
242 <code·class="inline">handle_cast(Request,·State)</code>,·which·is·expected·to·return·a·tuple242 <code·class="inline">handle_cast(Request,·State)</code>,·which·is·expected·to·return·a·tuple
243 <code·class="inline">{noreply,State1}</code>.·<code·class="inline">State1</code>·is·a·new·value·for·the·state·of·the·<code·class="inline">gen_server</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_cast</span><span·class="p"·data-group-id="0095722174-1">(</span><span·class="p"·data-group-id="0095722174-2">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="0095722174-2">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·6ecb9f093a161f6d54c4a13f7dff2663b562aa54f27d6cb87d81c8811ebf7b9c·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">243 <code·class="inline">{noreply,State1}</code>.·<code·class="inline">State1</code>·is·a·new·value·for·the·state·of·the·<code·class="inline">gen_server</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_cast</span><span·class="p"·data-group-id="3070514192-1">(</span><span·class="p"·data-group-id="3070514192-2">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="3070514192-2">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·4af64f276baa2b1f97557ef703d6fa571eb72c45cc42a834fa9a9d42b56c0a9e·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
244 ····</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="0095722174-3">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="0095722174-3">)</span><span·class="p">,</span><span·class="w">244 ····</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="3070514192-3">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="3070514192-3">)</span><span·class="p">,</span><span·class="w">
245 ····</span><span·class="p"·data-group-id="0095722174-4">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="0095722174-4">}</span><span·class="p">.</span></code></pre><p>In·this·case,·the·new·state·is·the·updated·list·of·available·channels·<code·class="inline">Chs2</code>.245 ····</span><span·class="p"·data-group-id="3070514192-4">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3070514192-4">}</span><span·class="p">.</span></code></pre><p>In·this·case,·the·new·state·is·the·updated·list·of·available·channels·<code·class="inline">Chs2</code>.
246 The·<code·class="inline">gen_server</code>·is·now·ready·for·new·requests.</p><h2·id="stopping"·class="section-heading">246 The·<code·class="inline">gen_server</code>·is·now·ready·for·new·requests.</p><h2·id="stopping"·class="section-heading">
247 ··<a·href="#stopping"·class="hover-link">247 ··<a·href="#stopping"·class="hover-link">
248 ····<i·class="ri-link-m"·aria-hidden="true"></i>248 ····<i·class="ri-link-m"·aria-hidden="true"></i>
249 ··</a>249 ··</a>
250 ··<span·class="text">Stopping</span>250 ··<span·class="text">Stopping</span>
251 </h2>251 </h2>
252 <h3·id="in-a-supervision-tree"·class="section-heading">252 <h3·id="in-a-supervision-tree"·class="section-heading">
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257 </h3>257 </h3>
258 <p>If·the·<code·class="inline">gen_server</code>·is·part·of·a·supervision·tree,·no·stop·function·is·needed.258 <p>If·the·<code·class="inline">gen_server</code>·is·part·of·a·supervision·tree,·no·stop·function·is·needed.
259 The·<code·class="inline">gen_server</code>·is·automatically·terminated·by·its·supervisor.··Exactly·how259 The·<code·class="inline">gen_server</code>·is·automatically·terminated·by·its·supervisor.··Exactly·how
260 this·is·done·is·defined·by·a·<a·href="sup_princ.html#shutdown">shutdown·strategy</a>260 this·is·done·is·defined·by·a·<a·href="sup_princ.html#shutdown">shutdown·strategy</a>
261 set·in·the·supervisor.</p><p>If·it·is·necessary·to·clean·up·before·termination,·the·shutdown·strategy261 set·in·the·supervisor.</p><p>If·it·is·necessary·to·clean·up·before·termination,·the·shutdown·strategy
262 must·be·a·time-out·value·and·the·<code·class="inline">gen_server</code>·must·be·set·to·trap·exit·signals262 must·be·a·time-out·value·and·the·<code·class="inline">gen_server</code>·must·be·set·to·trap·exit·signals
263 in·function·<code·class="inline">init</code>.·When·ordered·to·shutdown,·the·<code·class="inline">gen_server</code>·then·calls263 in·function·<code·class="inline">init</code>.·When·ordered·to·shutdown,·the·<code·class="inline">gen_server</code>·then·calls
264 the·callback·function·<code·class="inline">terminate(shutdown,·State)</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="5858296521-1">(</span><span·class="n">Args</span><span·class="p"·data-group-id="5858296521-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">264 the·callback·function·<code·class="inline">terminate(shutdown,·State)</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="8605567300-1">(</span><span·class="n">Args</span><span·class="p"·data-group-id="8605567300-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
265 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">265 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">
266 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="5858296521-2">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="5858296521-2">)</span><span·class="p">,</span><span·class="w">266 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="8605567300-2">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="8605567300-2">)</span><span·class="p">,</span><span·class="w">
267 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">267 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">
268 ····</span><span·class="p"·data-group-id="5858296521-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="5858296521-3">}</span><span·class="p">.</span><span·class="w">268 ····</span><span·class="p"·data-group-id="8605567300-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8605567300-3">}</span><span·class="p">.</span><span·class="w">
  
269 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">269 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
270 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="5858296521-4">(</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="5858296521-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">270 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="8605567300-4">(</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8605567300-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
271 ····</span><span·class="c1">%%·Code·for·cleaning·up·here</span><span·class="w">271 ····</span><span·class="c1">%%·Code·for·cleaning·up·here</span><span·class="w">
272 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">272 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
273 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><h3·id="standalone-gen_servers"·class="section-heading">273 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><h3·id="standalone-gen_servers"·class="section-heading">
274 ··<a·href="#standalone-gen_servers"·class="hover-link">274 ··<a·href="#standalone-gen_servers"·class="hover-link">
275 ····<i·class="ri-link-m"·aria-hidden="true"></i>275 ····<i·class="ri-link-m"·aria-hidden="true"></i>
276 ··</a>276 ··</a>
277 ··<span·class="text">Standalone·Gen_Servers</span>277 ··<span·class="text">Standalone·Gen_Servers</span>
278 </h3>278 </h3>
279 <p>If·the·<code·class="inline">gen_server</code>·is·not·part·of·a·supervision·tree,·a·stop·function279 <p>If·the·<code·class="inline">gen_server</code>·is·not·part·of·a·supervision·tree,·a·stop·function
280 can·be·useful,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">280 can·be·useful,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
281 </span><span·class="nf">export</span><span·class="p"·data-group-id="2429108959-1">(</span><span·class="p"·data-group-id="2429108959-2">[</span><span·class="ss">stop</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2429108959-2">]</span><span·class="p"·data-group-id="2429108959-1">)</span><span·class="p">.</span><span·class="w">281 </span><span·class="nf">export</span><span·class="p"·data-group-id="9389959241-1">(</span><span·class="p"·data-group-id="9389959241-2">[</span><span·class="ss">stop</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="9389959241-2">]</span><span·class="p"·data-group-id="9389959241-1">)</span><span·class="p">.</span><span·class="w">
282 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">282 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
283 </span><span·class="nf">stop</span><span·class="p"·data-group-id="2429108959-3">(</span><span·class="p"·data-group-id="2429108959-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">283 </span><span·class="nf">stop</span><span·class="p"·data-group-id="9389959241-3">(</span><span·class="p"·data-group-id="9389959241-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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181 ······<p·class="built-using">181 ······<p·class="built-using">
182 ········Built·using182 ········Built·using
183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
185 ······</p>185 ······</p>
186 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>186 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
190 </div>190 </div>
191 <script>191 <script>
192 ··function·mermaidLoaded()·{192 ··function·mermaidLoaded()·{
193 ····mermaid.initialize({193 ····mermaid.initialize({
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161 belonging·to·the·primary·application.</p><h2·id="specifying-included-applications"·class="section-heading">161 belonging·to·the·primary·application.</p><h2·id="specifying-included-applications"·class="section-heading">
162 ··<a·href="#specifying-included-applications"·class="hover-link">162 ··<a·href="#specifying-included-applications"·class="hover-link">
163 ····<i·class="ri-link-m"·aria-hidden="true"></i>163 ····<i·class="ri-link-m"·aria-hidden="true"></i>
164 ··</a>164 ··</a>
165 ··<span·class="text">Specifying·Included·Applications</span>165 ··<span·class="text">Specifying·Included·Applications</span>
166 </h2>166 </h2>
167 <p>Which·applications·to·include·is·defined·by·the·<code·class="inline">included_applications</code>·key·in167 <p>Which·applications·to·include·is·defined·by·the·<code·class="inline">included_applications</code>·key·in
168 the·<code·class="inline">.app</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7235995318-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prim_app</span><span·class="p">,</span><span·class="w">168 the·<code·class="inline">.app</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8927663432-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prim_app</span><span·class="p">,</span><span·class="w">
169 ·</span><span·class="p"·data-group-id="7235995318-2">[</span><span·class="p"·data-group-id="7235995318-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Tree·application&quot;</span><span·class="p"·data-group-id="7235995318-3">}</span><span·class="p">,</span><span·class="w">169 ·</span><span·class="p"·data-group-id="8927663432-2">[</span><span·class="p"·data-group-id="8927663432-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Tree·application&quot;</span><span·class="p"·data-group-id="8927663432-3">}</span><span·class="p">,</span><span·class="w">
170 ··</span><span·class="p"·data-group-id="7235995318-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="7235995318-4">}</span><span·class="p">,</span><span·class="w">170 ··</span><span·class="p"·data-group-id="8927663432-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="8927663432-4">}</span><span·class="p">,</span><span·class="w">
171 ··</span><span·class="p"·data-group-id="7235995318-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7235995318-6">[</span><span·class="ss">prim_app_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pr[·...·truncated·by·diffoscope;·len:·198,·SHA:·a48888e89d40847508363f76d3ab618313aaaa53e5a40abe4b47c4e00923aba6·...·]-5">}</span><span·class="p">,</span><span·class="w">171 ··</span><span·class="p"·data-group-id="8927663432-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8927663432-6">[</span><span·class="ss">prim_app_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pr[·...·truncated·by·diffoscope;·len:·198,·SHA:·36eee0284692a484f50793d7a3eace2eac18993c68335edbc705d014d3414f77·...·]-5">}</span><span·class="p">,</span><span·class="w">
172 ··</span><span·class="p"·data-group-id="7235995318-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7235995318-8">[</span><span·class="ss">prim_app_server</span><span·class="p"·data-group-id="7235995318-8">]</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·fc5f614d78402c4000f7ac579bf13943382ce819e292ded9f4a5d7f1783a45d1·...·]-7">}</span><span·class="p">,</span><span·class="w">172 ··</span><span·class="p"·data-group-id="8927663432-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8927663432-8">[</span><span·class="ss">prim_app_server</span><span·class="p"·data-group-id="8927663432-8">]</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·c18b3f001096c4bd6ac2ad128abe3fd9b4afd7c6cfeffba57a542c0f217e3a2c·...·]-7">}</span><span·class="p">,</span><span·class="w">
173 ··</span><span·class="p"·data-group-id="7235995318-9">{</span><span·class="ss">included_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7235995318-10">[</span><span·class="ss">incl_app</span><span·class="p"·data-group-id="7235995318-10">]</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·665747c708c1197f4e3aa24d72988b8fc285001c7a7d36f2189b84a3aee08ce1·...·]-9">}</span><span·class="p">,</span><span·class="w">173 ··</span><span·class="p"·data-group-id="8927663432-9">{</span><span·class="ss">included_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8927663432-10">[</span><span·class="ss">incl_app</span><span·class="p"·data-group-id="8927663432-10">]</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·b67e9d5fe44eebd669195ced70f919a3dd12f298f7453889c926e1271966fa12·...·]-9">}</span><span·class="p">,</span><span·class="w">
174 ··</span><span·class="p"·data-group-id="7235995318-11">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7235995318-12">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·184,·SHA:·49e368f5d70b29ff30ec168d3c3aba9ea24936663d074613f911c46f8826c3be·...·]-11">}</span><span·class="p">,</span><span·class="w">174 ··</span><span·class="p"·data-group-id="8927663432-11">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8927663432-12">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·184,·SHA:·20de3fad799cef570f47b8834b82fd610974f96e7f1856079c89073b02487baa·...·]-11">}</span><span·class="p">,</span><span·class="w">
175 ··</span><span·class="p"·data-group-id="7235995318-13">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7235995318-14">{</span><span·class="ss">prim_app_cb</span><span·class="p">,</span><span·class="p"·data-group-id="7235995318-15">[</span><span·class="p"·data-group-id="7235995318-15">]</span><span·class="p"·data-group-id="7235995318-14">}</span><span·class="p"·data-group-id="7235995318-13">}</span><span·class="p">,</span><span·class="w"> 
176 ··</span><span·class="p"·data-group-id="7235995318-16">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7235995318-17">[</span><span·class="p"·data-group-id="7235995318-18">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/usr/local/log&quot;</span><span·class="p"·data-group-id="7235995318-18">}</span><span·class="p"·data-group-id="7235995318-17">]</span><span·class="p"·data-group-id="7235995318-16">}</span><span·class="w"> 
177 ·</span><span·class="p"·data-group-id="7235995318-2">]</span><span·class="p"·data-group-id="7235995318-1">}</span><span·class="p">.</span></code></pre><h2·id="synchronizing-processes-during-startup"·class="section-heading">175 ··</span><span·class="p"·data-group-id="8927663432-13">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8927663432-14">{</span><span·class="ss">prim_app_cb</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·248,·SHA:·a120b1155c2a4738075e81432254aca7c2672c94cb0583210d0458aa0d00f08b·...·]">
 176 ··</span><span·class="p"·data-group-id="8927663432-16">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8927663432-17">[</span><span·class="p"·data-group-id="8927663432-18">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/usr/local/log&quot;</span><span·class="p"·data-group-id="8927663432-18">}</span><span·class="p"·data-group-id="8927663432-17">]</span><span·class="p"·data-group-id="8927663432-16">}</span><span·class="w">
 177 ·</span><span·class="p"·data-group-id="8927663432-2">]</span><span·class="p"·data-group-id="8927663432-1">}</span><span·class="p">.</span></code></pre><h2·id="synchronizing-processes-during-startup"·class="section-heading">
178 ··<a·href="#synchronizing-processes-during-startup"·class="hover-link">178 ··<a·href="#synchronizing-processes-during-startup"·class="hover-link">
179 ····<i·class="ri-link-m"·aria-hidden="true"></i>179 ····<i·class="ri-link-m"·aria-hidden="true"></i>
180 ··</a>180 ··</a>
181 ··<span·class="text">Synchronizing·Processes·during·Startup</span>181 ··<span·class="text">Synchronizing·Processes·during·Startup</span>
182 </h2>182 </h2>
183 <p>The·supervisor·tree·of·an·included·application·is·started·as·part·of·the183 <p>The·supervisor·tree·of·an·included·application·is·started·as·part·of·the
184 supervisor·tree·of·the·including·application.·If·there·is·a·need·for184 supervisor·tree·of·the·including·application.·If·there·is·a·need·for
185 synchronization·between·processes·in·the·including·and·included·applications,185 synchronization·between·processes·in·the·including·and·included·applications,
186 this·can·be·achieved·by·using·<em>start·phases</em>.</p><p>Start·phases·are·defined·by·the·<code·class="inline">start_phases</code>·key·in·the·<code·class="inline">.app</code>·file·as·a·list186 this·can·be·achieved·by·using·<em>start·phases</em>.</p><p>Start·phases·are·defined·by·the·<code·class="inline">start_phases</code>·key·in·the·<code·class="inline">.app</code>·file·as·a·list
187 of·tuples·<code·class="inline">{Phase,PhaseArgs}</code>,·where·<code·class="inline">Phase</code>·is·an·atom·and·<code·class="inline">PhaseArgs</code>·is·a187 of·tuples·<code·class="inline">{Phase,PhaseArgs}</code>,·where·<code·class="inline">Phase</code>·is·an·atom·and·<code·class="inline">PhaseArgs</code>·is·a
188 term.</p><p>The·value·of·the·<code·class="inline">mod</code>·key·of·the·including·application·must·be·set·to188 term.</p><p>The·value·of·the·<code·class="inline">mod</code>·key·of·the·including·application·must·be·set·to
189 <code·class="inline">{application_starter,[Module,StartArgs]}</code>,·where·<code·class="inline">Module</code>·as·usual·is·the189 <code·class="inline">{application_starter,[Module,StartArgs]}</code>,·where·<code·class="inline">Module</code>·as·usual·is·the
190 application·callback·module.·<code·class="inline">StartArgs</code>·is·a·term·provided·as·argument·to·the190 application·callback·module.·<code·class="inline">StartArgs</code>·is·a·term·provided·as·argument·to·the
191 callback·function·<code·class="inline">Module:start/2</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9919297664-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prim_app</span><span·class="p">,</span><span·class="w">191 callback·function·<code·class="inline">Module:start/2</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7372487030-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prim_app</span><span·class="p">,</span><span·class="w">
192 ·</span><span·class="p"·data-group-id="9919297664-2">[</span><span·class="p"·data-group-id="9919297664-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Tree·application&quot;</span><span·class="p"·data-group-id="9919297664-3">}</span><span·class="p">,</span><span·class="w">192 ·</span><span·class="p"·data-group-id="7372487030-2">[</span><span·class="p"·data-group-id="7372487030-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Tree·application&quot;</span><span·class="p"·data-group-id="7372487030-3">}</span><span·class="p">,</span><span·class="w">
193 ··</span><span·class="p"·data-group-id="9919297664-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="9919297664-4">}</span><span·class="p">,</span><span·class="w">193 ··</span><span·class="p"·data-group-id="7372487030-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="7372487030-4">}</span><span·class="p">,</span><span·class="w">
194 ··</span><span·class="p"·data-group-id="9919297664-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-6">[</span><span·class="ss">prim_app_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pr[·...·truncated·by·diffoscope;·len:·198,·SHA:·2feb92a2d7a439974c28c989384e6bb8593dbfa1f3e52751ad82fb1d6e2b9bd9·...·]-5">}</span><span·class="p">,</span><span·class="w">194 ··</span><span·class="p"·data-group-id="7372487030-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-6">[</span><span·class="ss">prim_app_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pr[·...·truncated·by·diffoscope;·len:·198,·SHA:·f747c755c96f816a1198babc557be6000023ab4e15329b9b1e9e66ce894a8619·...·]-5">}</span><span·class="p">,</span><span·class="w">
195 ··</span><span·class="p"·data-group-id="9919297664-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-8">[</span><span·class="ss">prim_app_server</span><span·class="p"·data-group-id="9919297664-8">]</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·08c507dcaaa1c6fee825f0d605508658967b24dfe05e6273f8831c56abbaf4c6·...·]-7">}</span><span·class="p">,</span><span·class="w">195 ··</span><span·class="p"·data-group-id="7372487030-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-8">[</span><span·class="ss">prim_app_server</span><span·class="p"·data-group-id="7372487030-8">]</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·d6f59115f5d5eead1030fb15cd68e6fd7ffd61e087f36688890ddd680b4e5ea8·...·]-7">}</span><span·class="p">,</span><span·class="w">
196 ··</span><span·class="p"·data-group-id="9919297664-9">{</span><span·class="ss">included_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-10">[</span><span·class="ss">incl_app</span><span·class="p"·data-group-id="9919297664-10">]</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·2d90b350eb4f4547816a35f12af464434982c5b6868cb6a931b1154b7fe72ec9·...·]-9">}</span><span·class="p">,</span><span·class="w">196 ··</span><span·class="p"·data-group-id="7372487030-9">{</span><span·class="ss">included_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-10">[</span><span·class="ss">incl_app</span><span·class="p"·data-group-id="7372487030-10">]</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·b6294b74cf97fe491bfd5f272dd844d7b9fba6789b81e6fb2065cada6b147c91·...·]-9">}</span><span·class="p">,</span><span·class="w">
197 ··</span><span·class="p"·data-group-id="9919297664-11">{</span><span·class="ss">start_phases</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-12">[</span><span·class="p"·data-group-id="9919297664-13">{</span><span·class="ss">init</span><span·class="[·...·truncated·by·diffoscope;·len:·582,·SHA:·55e7b517d77f6182ec9c4d3a517a11df5042d9a1302ad0d2d9a9b87f903a16f6·...·]-11">}</span><span·class="p">,</span><span·class="w">197 ··</span><span·class="p"·data-group-id="7372487030-11">{</span><span·class="ss">start_phases</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-12">[</span><span·class="p"·data-group-id="7372487030-13">{</span><span·class="ss">init</span><span·class="[·...·truncated·by·diffoscope;·len:·582,·SHA:·9a045083f92e99ad4d19fff5d6853aaec04d5388b19c9c2bcfce0ec6340da95a·...·]-11">}</span><span·class="p">,</span><span·class="w">
198 ··</span><span·class="p"·data-group-id="9919297664-17">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-18">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·184,·SHA:·99db5a452ba2a9e72df8053e4ccddfbd6dbebb18c61474310f94cca1abbe17fa·...·]-17">}</span><span·class="p">,</span><span·class="w">198 ··</span><span·class="p"·data-group-id="7372487030-17">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-18">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·184,·SHA:·b4558955a11807b081e3449f6e39fb9f086b8ecccf68e7bfed54081f114e0c40·...·]-17">}</span><span·class="p">,</span><span·class="w">
199 ··</span><span·class="p"·data-group-id="9919297664-19">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-20">{</span><span·class="ss">application_starter</span><span·class="p">,</span><span·class="p"·data-group-id="991929[·...·truncated·by·diffoscope;·len:·333,·SHA:·6cb07deb7605b38c97067008663c87fc83fb046057d41410b9cbaf73775f722a·...·]-19">}</span><span·class="p">,</span><span·class="w">199 ··</span><span·class="p"·data-group-id="7372487030-19">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-20">{</span><span·class="ss">application_starter</span><span·class="p">,</span><span·class="p"·data-group-id="737248[·...·truncated·by·diffoscope;·len:·333,·SHA:·70456d133c4a3785ad4723b73623d7c4abe52289d10fefc7b9138e865d8e5d0e·...·]-19">}</span><span·class="p">,</span><span·class="w">
200 ··</span><span·class="p"·data-group-id="9919297664-23">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-24">[</span><span·class="p"·data-group-id="9919297664-25">{</span><span·class="ss">file</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·224,·SHA:·ce41f4057297c81d4bcb7c329ff0e52a5093c39a2d5de1792dc7251df0cc0d10·...·]-23">}</span><span·class="w">200 ··</span><span·class="p"·data-group-id="7372487030-23">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-24">[</span><span·class="p"·data-group-id="7372487030-25">{</span><span·class="ss">file</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·224,·SHA:·8d2527d49daca531f6f80c4342e3179aef664ee29a20592d404519af886c1376·...·]-23">}</span><span·class="w">
201 ·</span><span·class="p"·data-group-id="9919297664-2">]</span><span·class="p"·data-group-id="9919297664-1">}</span><span·class="p">.</span><span·class="w">201 ·</span><span·class="p"·data-group-id="7372487030-2">]</span><span·class="p"·data-group-id="7372487030-1">}</span><span·class="p">.</span><span·class="w">
  
202 </span><span·class="p"·data-group-id="9919297664-26">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">incl_app</span><span·class="p">,</span><span·class="w">202 </span><span·class="p"·data-group-id="7372487030-26">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">incl_app</span><span·class="p">,</span><span·class="w">
203 ·</span><span·class="p"·data-group-id="9919297664-27">[</span><span·class="p"·data-group-id="9919297664-28">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Included·application&quot;</span><span·class="p"·data-group-id="9919297664-28">}</span><span·class="p">,</span><span·class="w">203 ·</span><span·class="p"·data-group-id="7372487030-27">[</span><span·class="p"·data-group-id="7372487030-28">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Included·application&quot;</span><span·class="p"·data-group-id="7372487030-28">}</span><span·class="p">,</span><span·class="w">
204 ··</span><span·class="p"·data-group-id="9919297664-29">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="9919297664-29">}</span><span·class="p">,</span><span·class="w">204 ··</span><span·class="p"·data-group-id="7372487030-29">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="7372487030-29">}</span><span·class="p">,</span><span·class="w">
205 ··</span><span·class="p"·data-group-id="9919297664-30">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-31">[</span><span·class="ss">incl_app_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·201,·SHA:·9669e792f8f8d2a4e6a4a1ff01d4a43aac2ca891d036eb3ebeca8c123ddff41f·...·]-30">}</span><span·class="p">,</span><span·class="w">205 ··</span><span·class="p"·data-group-id="7372487030-30">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-31">[</span><span·class="ss">incl_app_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·201,·SHA:·4e4f7a7701037f444634d7e843ce595510cb7d4970b3dd0df5cea03431751807·...·]-30">}</span><span·class="p">,</span><span·class="w">
206 ··</span><span·class="p"·data-group-id="9919297664-32">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-33">[</span><span·class="p"·data-group-id="9919297664-33">]</span><span·class="p"·data-group-id="9919297664-32">}</span><span·class="p">,</span><span·class="w">206 ··</span><span·class="p"·data-group-id="7372487030-32">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-33">[</span><span·class="p"·data-group-id="7372487030-33">]</span><span·class="p"·data-group-id="7372487030-32">}</span><span·class="p">,</span><span·class="w">
207 ··</span><span·class="p"·data-group-id="9919297664-34">{</span><span·class="ss">start_phases</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-35">[</span><span·class="p"·data-group-id="9919297664-36">{</span><span·class="ss">go</span><span·class="p"[·...·truncated·by·diffoscope;·len:·266,·SHA:·7a9fbb712423ad6abad8be1e37c8399c69241939514378ee29e3ac195d3cc59b·...·]-34">}</span><span·class="p">,</span><span·class="w">207 ··</span><span·class="p"·data-group-id="7372487030-34">{</span><span·class="ss">start_phases</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-35">[</span><span·class="p"·data-group-id="7372487030-36">{</span><span·class="ss">go</span><span·class="p"[·...·truncated·by·diffoscope;·len:·266,·SHA:·e714318dfd68b783b13b717fa7f425b5fdd4dd0e89d7968d3f5deebe6cf9bf2a·...·]-34">}</span><span·class="p">,</span><span·class="w">
208 ··</span><span·class="p"·data-group-id="9919297664-38">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-39">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·184,·SHA:·d693d4e9c595f5d0d24131f378e3a946250a49e47e89151e9331bf78e9390ed7·...·]-38">}</span><span·class="p">,</span><span·class="w">208 ··</span><span·class="p"·data-group-id="7372487030-38">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-39">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·184,·SHA:·467da3e1bc8f30d8ce45bd4d765c362c90573cc9552ad41cd95e4d39878cb9c0·...·]-38">}</span><span·class="p">,</span><span·class="w">
209 ··</span><span·class="p"·data-group-id="9919297664-40">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9919297664-41">{</span><span·class="ss">incl_app_cb</span><span·class="p">,</span><span·class="p"·data-group-id="9919297664-42"[·...·truncated·by·diffoscope;·len:·158,·SHA:·68a120879141721c36435d41a7b4781185a66a1e883c3dba32153bfd96617c84·...·]-40">}</span><span·class="w">209 ··</span><span·class="p"·data-group-id="7372487030-40">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7372487030-41">{</span><span·class="ss">incl_app_cb</span><span·class="p">,</span><span·class="p"·data-group-id="7372487030-42"[·...·truncated·by·diffoscope;·len:·158,·SHA:·a465fb5a874841793c36a8b0669f9b16c616ab26fdf42a5df99b62f4df2b1b84·...·]-40">}</span><span·class="w">
210 ·</span><span·class="p"·data-group-id="9919297664-27">]</span><span·class="p"·data-group-id="9919297664-26">}</span><span·class="p">.</span></code></pre><p>When·starting·a·primary·application·with·included·applications,·the·primary210 ·</span><span·class="p"·data-group-id="7372487030-27">]</span><span·class="p"·data-group-id="7372487030-26">}</span><span·class="p">.</span></code></pre><p>When·starting·a·primary·application·with·included·applications,·the·primary
211 application·is·started·the·normal·way,·that·is:</p><ul><li>The·application·controller·creates·an·application·master·for·the·application</li><li>The·application·master·calls·<code·class="inline">Module:start(normal,·StartArgs)</code>·to·start·the211 application·is·started·the·normal·way,·that·is:</p><ul><li>The·application·controller·creates·an·application·master·for·the·application</li><li>The·application·master·calls·<code·class="inline">Module:start(normal,·StartArgs)</code>·to·start·the
212 top·supervisor.</li></ul><p>Then,·for·the·primary·application·and·each·included·application·in·top-down,212 top·supervisor.</li></ul><p>Then,·for·the·primary·application·and·each·included·application·in·top-down,
213 left-to-right·order,·the·application·master·calls213 left-to-right·order,·the·application·master·calls
214 <code·class="inline">Module:start_phase(Phase,·Type,·PhaseArgs)</code>·for·each·phase·defined·for·the214 <code·class="inline">Module:start_phase(Phase,·Type,·PhaseArgs)</code>·for·each·phase·defined·for·the
215 primary·application,·in·that·order.·If·a·phase·is·not·defined·for·an·included215 primary·application,·in·that·order.·If·a·phase·is·not·defined·for·an·included
216 application,·the·function·is·not·called·for·this·phase·and·application.</p><p>The·following·requirements·apply·to·the·<code·class="inline">.app</code>·file·for·an·included·application:</p><ul><li>The·<code·class="inline">{mod,·{Module,StartArgs}}</code>·option·must·be·included.·This·option·is·used216 application,·the·function·is·not·called·for·this·phase·and·application.</p><p>The·following·requirements·apply·to·the·<code·class="inline">.app</code>·file·for·an·included·application:</p><ul><li>The·<code·class="inline">{mod,·{Module,StartArgs}}</code>·option·must·be·included.·This·option·is·used
217 to·find·the·callback·module·<code·class="inline">Module</code>·of·the·application.·<code·class="inline">StartArgs</code>·is217 to·find·the·callback·module·<code·class="inline">Module</code>·of·the·application.·<code·class="inline">StartArgs</code>·is
218 ignored,·as·<code·class="inline">Module:start/2</code>·is·called·only·for·the·primary·application.</li><li>If·the·included·application·itself·contains·included·applications,·instead·the218 ignored,·as·<code·class="inline">Module:start/2</code>·is·called·only·for·the·primary·application.</li><li>If·the·included·application·itself·contains·included·applications,·instead·the
219 <code·class="inline">{mod,·{application_starter,·[Module,StartArgs]}}</code>·option·must·be·included.</li><li>The·<code·class="inline">{start_phases,·[{Phase,PhaseArgs}]}</code>·option·must·be·included,·and·the·set219 <code·class="inline">{mod,·{application_starter,·[Module,StartArgs]}}</code>·option·must·be·included.</li><li>The·<code·class="inline">{start_phases,·[{Phase,PhaseArgs}]}</code>·option·must·be·included,·and·the·set
220 of·specified·phases·must·be·a·subset·of·the·set·of·phases·specified·for·the220 of·specified·phases·must·be·a·subset·of·the·set·of·phases·specified·for·the
221 primary·application.</li></ul><p>When·starting·<code·class="inline">prim_app</code>·as·defined·above,·the·application·controller·calls·the221 primary·application.</li></ul><p>When·starting·<code·class="inline">prim_app</code>·as·defined·above,·the·application·controller·calls·the
222 following·callback·functions·before·<code·class="inline">application:start(prim_app)</code>·returns·a222 following·callback·functions·before·<code·class="inline">application:start(prim_app)</code>·returns·a
223 value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6882052942-1">(</span><span·class="ss">prim_app</span><span·class="p"·data-group-id="6882052942-1">)</span><span·class="w">223 value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5483698481-1">(</span><span·class="ss">prim_app</span><span·class="p"·data-group-id="5483698481-1">)</span><span·class="w">
224 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">prim_app_cb</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6882052942-2">(</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6882052942-3">[</span><span·class="p"·data-group-id="6882052942-3">]</span><span·class="p"·data-group-id="6882052942-2">)</span><span·class="w">224 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">prim_app_cb</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5483698481-2">(</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5483698481-3">[</span><span·class="p"·data-group-id="5483698481-3">]</span><span·class="p"·data-group-id="5483698481-2">)</span><span·class="w">
225 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">prim_app_cb</span><span·class="p">:</span><span·class="nf">start_phase</span><span·class="p"·data-group-id="6882052942-4">(</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6882052942-5">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·67,·SHA:·8050a2255f6c5af28d3922575541091e2f45bc4da7beb71a034978a519df30ab·...·]-4">)</span><span·class="w">225 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">prim_app_cb</span><span·class="p">:</span><span·class="nf">start_phase</span><span·class="p"·data-group-id="5483698481-4">(</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5483698481-5">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·67,·SHA:·c829523edea077c786afcb2dc8d4186ce111fc069c1d1e17bbfe894fd3ebd6b2·...·]-4">)</span><span·class="w">
226 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">prim_app_cb</span><span·class="p">:</span><span·class="nf">start_phase</span><span·class="p"·data-group-id="6882052942-6">(</span><span·class="ss">go</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6882052942-7">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·9c5e6b149bac4a914ece66d6284fd565f5fa121607afcde317a793a9d3ff579b·...·]-6">)</span><span·class="w">226 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">prim_app_cb</span><span·class="p">:</span><span·class="nf">start_phase</span><span·class="p"·data-group-id="5483698481-6">(</span><span·class="ss">go</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5483698481-7">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·ab2d0f555527fd383f8c47efdf3a232fbbd737f51a797c84b282b7fb93eb59ac·...·]-6">)</span><span·class="w">
227 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">incl_app_cb</span><span·class="p">:</span><span·class="nf">start_phase</span><span·class="p"·data-group-id="6882052942-8">(</span><span·class="ss">go</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6882052942-9">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·d7d95ec60e120af862832b569940271c8ac6be314ae12b084d90c056587ea5ae·...·]-8">)</span><span·class="w">227 ·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">incl_app_cb</span><span·class="p">:</span><span·class="nf">start_phase</span><span·class="p"·data-group-id="5483698481-8">(</span><span·class="ss">go</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5483698481-9">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·35fe9f81df08806a16aaa6d389eb08cff992d2a4281f876dc14faf94ed34d358·...·]-8">)</span><span·class="w">
228 </span><span·class="ss">ok</span></code></pre>228 </span><span·class="ss">ok</span></code></pre>
229 </div>229 </div>
  
230 <div·class="bottom-actions"·id="bottom-actions">230 <div·class="bottom-actions"·id="bottom-actions">
231 ··<div·class="bottom-actions-item">231 ··<div·class="bottom-actions-item">
  
232 ······<a·href="applications.html"·class="bottom-actions-button"·rel="prev">232 ······<a·href="applications.html"·class="bottom-actions-button"·rel="prev">
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273 ······<p·class="built-using">273 ······<p·class="built-using">
274 ········Built·using274 ········Built·using
275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
277 ······</p>277 ······</p>
278 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>278 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
279 ····</footer>279 ····</footer>
280 ··</div>280 ··</div>
281 </main>281 </main>
282 </div>282 </div>
283 <script>283 <script>
284 ··function·mermaidLoaded()·{284 ··function·mermaidLoaded()·{
285 ····mermaid.initialize({285 ····mermaid.initialize({
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484 ······<p·class="built-using">484 ······<p·class="built-using">
485 ········Built·using485 ········Built·using
486 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the486 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
487 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>487 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
488 ······</p>488 ······</p>
489 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>489 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
490 ····</footer>490 ····</footer>
491 ··</div>491 ··</div>
492 </main>492 </main>
493 </div>493 </div>
494 <script>494 <script>
495 ··function·mermaidLoaded()·{495 ··function·mermaidLoaded()·{
496 ····mermaid.initialize({496 ····mermaid.initialize({
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295 </span><span·class="gp·unselectable">$·</span><span·class="">cd·erts/emulator295 </span><span·class="gp·unselectable">$·</span><span·class="">cd·erts/emulator
296 </span><span·class="gp·unselectable">$·</span><span·class="">make·debug296 </span><span·class="gp·unselectable">$·</span><span·class="">make·debug
297 </span><span·class="gp·unselectable">$·</span><span·class="">cd·../etc297 </span><span·class="gp·unselectable">$·</span><span·class="">cd·../etc
298 </span><span·class="gp·unselectable">$·</span><span·class="">make·debug298 </span><span·class="gp·unselectable">$·</span><span·class="">make·debug
299 </span></code></pre><p>and·sometimes</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP299 </span></code></pre><p>and·sometimes</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP
300 </span><span·class="gp·unselectable">$·</span><span·class="">make·local_setup300 </span><span·class="gp·unselectable">$·</span><span·class="">make·local_setup
301 </span></code></pre><p>So·now·when·you·run·<code·class="inline">$ERL_TOP/erl.exe</code>,·you·should·have·a·debug·compiled301 </span></code></pre><p>So·now·when·you·run·<code·class="inline">$ERL_TOP/erl.exe</code>,·you·should·have·a·debug·compiled
302 emulator,·which·you·will·see·if·you·do·a:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="5553757848-1">(</span><span·class="ss">system_version</span><span·class="p"·data-group-id="5553757848-1">)</span><span·class="p">.</span></code></pre><p>in·the·erlang·shell.·If·the·returned·string·contains·<code·class="inline">[debug]</code>,·you302 emulator,·which·you·will·see·if·you·do·a:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="6104904512-1">(</span><span·class="ss">system_version</span><span·class="p"·data-group-id="6104904512-1">)</span><span·class="p">.</span></code></pre><p>in·the·erlang·shell.·If·the·returned·string·contains·<code·class="inline">[debug]</code>,·you
303 got·a·debug·compiled·emulator.</p><p>To·hack·the·erlang·libraries,·you·simply·do·a·<code·class="inline">make·opt</code>·in·the303 got·a·debug·compiled·emulator.</p><p>To·hack·the·erlang·libraries,·you·simply·do·a·<code·class="inline">make·opt</code>·in·the
304 specific·&quot;applications&quot;·directory,·like:</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP/lib/stdlib304 specific·&quot;applications&quot;·directory,·like:</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP/lib/stdlib
305 </span><span·class="gp·unselectable">$·</span><span·class="">make·opt305 </span><span·class="gp·unselectable">$·</span><span·class="">make·opt
306 </span></code></pre><p>or·even·in·the·source·directory...</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP/lib/stdlib/src306 </span></code></pre><p>or·even·in·the·source·directory...</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP/lib/stdlib/src
307 </span><span·class="gp·unselectable">$·</span><span·class="">make·opt307 </span><span·class="gp·unselectable">$·</span><span·class="">make·opt
308 </span></code></pre><p>Note·that·you're·expected·to·have·a·fresh·Erlang·in·your·path·when308 </span></code></pre><p>Note·that·you're·expected·to·have·a·fresh·Erlang·in·your·path·when
309 doing·this,·preferably·the·plain·27·you·have·built·in·the·previous309 doing·this,·preferably·the·plain·27·you·have·built·in·the·previous
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318 </span><span·class="">:$ERL_TOP/erts/etc/win32/wsl_tools:$ERL_TOP/bootstrap/bin:$PATH318 </span><span·class="">:$ERL_TOP/erts/etc/win32/wsl_tools:$ERL_TOP/bootstrap/bin:$PATH
319 </span></code></pre><p>That·should·make·it·possible·to·rebuild·any·library·without·hassle...</p><p>If·you·want·to·copy·a·library·(an·application)·newly·built,·to·a319 </span></code></pre><p>That·should·make·it·possible·to·rebuild·any·library·without·hassle...</p><p>If·you·want·to·copy·a·library·(an·application)·newly·built,·to·a
320 release·area,·you·do·like·with·the·emulator:</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP/lib/stdlib320 release·area,·you·do·like·with·the·emulator:</p><pre><code·class="makeup·shell"·translate="no"><span·class="gp·unselectable">$·</span><span·class="">cd·$ERL_TOP/lib/stdlib
321 </span><span·class="gp·unselectable">$·</span><span·class="">make·TESTROOT=/tmp/erlang_release·release321 </span><span·class="gp·unselectable">$·</span><span·class="">make·TESTROOT=/tmp/erlang_release·release
322 </span></code></pre><p>Remember·that:</p><ul><li><p>··Windows·specific·C-code·goes·in·the·<code·class="inline">$ERL_TOP/erts/emulator/sys/win32</code>,322 </span></code></pre><p>Remember·that:</p><ul><li><p>··Windows·specific·C-code·goes·in·the·<code·class="inline">$ERL_TOP/erts/emulator/sys/win32</code>,
323 <code·class="inline">$ERL_TOP/erts/emulator/drivers/win32</code>·or·<code·class="inline">$ERL_TOP/erts/etc/win32</code>.</p></li><li><p>··Windows·specific·erlang·code·should·be·used·conditionally·and·the323 <code·class="inline">$ERL_TOP/erts/emulator/drivers/win32</code>·or·<code·class="inline">$ERL_TOP/erts/etc/win32</code>.</p></li><li><p>··Windows·specific·erlang·code·should·be·used·conditionally·and·the
324 host·OS·tested·in·<em>runtime</em>,·the·exactly·same·beam·files·should·be324 host·OS·tested·in·<em>runtime</em>,·the·exactly·same·beam·files·should·be
325 distributed·for·every·platform!·So·write·code·like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">type</span><span·class="p"·data-group-id="9104061707-1">(</span><span·class="p"·data-group-id="9104061707-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">325 distributed·for·every·platform!·So·write·code·like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">type</span><span·class="p"·data-group-id="5654921358-1">(</span><span·class="p"·data-group-id="5654921358-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
326 ····</span><span·class="p"·data-group-id="9104061707-2">{</span><span·class="ss">win32</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="9104061707-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">326 ····</span><span·class="p"·data-group-id="5654921358-2">{</span><span·class="ss">win32</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="5654921358-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
327 ········</span><span·class="nf">do_windows_specific</span><span·class="p"·data-group-id="9104061707-3">(</span><span·class="p"·data-group-id="9104061707-3">)</span><span·class="p">;</span><span·class="w">327 ········</span><span·class="nf">do_windows_specific</span><span·class="p"·data-group-id="5654921358-3">(</span><span·class="p"·data-group-id="5654921358-3">)</span><span·class="p">;</span><span·class="w">
328 ····</span><span·class="n">Other</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">328 ····</span><span·class="n">Other</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
329 ········</span><span·class="nf">do_fallback_or_exit</span><span·class="p"·data-group-id="9104061707-4">(</span><span·class="p"·data-group-id="9104061707-4">)</span><span·class="w">329 ········</span><span·class="nf">do_fallback_or_exit</span><span·class="p"·data-group-id="5654921358-4">(</span><span·class="p"·data-group-id="5654921358-4">)</span><span·class="w">
330 </span><span·class="k">end</span><span·class="p">,</span></code></pre></li></ul><p>That's·basically·all·you·need·to·get·going.</p><h2·id="frequently-asked-questions"·class="section-heading">330 </span><span·class="k">end</span><span·class="p">,</span></code></pre></li></ul><p>That's·basically·all·you·need·to·get·going.</p><h2·id="frequently-asked-questions"·class="section-heading">
331 ··<a·href="#frequently-asked-questions"·class="hover-link">331 ··<a·href="#frequently-asked-questions"·class="hover-link">
332 ····<i·class="ri-link-m"·aria-hidden="true"></i>332 ····<i·class="ri-link-m"·aria-hidden="true"></i>
333 ··</a>333 ··</a>
334 ··<span·class="text">Frequently·Asked·Questions</span>334 ··<span·class="text">Frequently·Asked·Questions</span>
335 </h2>335 </h2>
336 <ul><li><p>··Q:·So,·now·I·can·build·Erlang·using·GCC·on·Windows?</p><p>A:·No,·unfortunately·not.·You'll·need·Microsoft's·Visual·C++336 <ul><li><p>··Q:·So,·now·I·can·build·Erlang·using·GCC·on·Windows?</p><p>A:·No,·unfortunately·not.·You'll·need·Microsoft's·Visual·C++
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431 ······<p·class="built-using">431 ······<p·class="built-using">
432 ········Built·using432 ········Built·using
433 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the433 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
434 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>434 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
435 ······</p>435 ······</p>
436 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>436 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
437 ····</footer>437 ····</footer>
438 ··</div>438 ··</div>
439 </main>439 </main>
440 </div>440 </div>
441 <script>441 <script>
442 ··function·mermaidLoaded()·{442 ··function·mermaidLoaded()·{
443 ····mermaid.initialize({443 ····mermaid.initialize({
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659 ········Built·using659 ········Built·using
660 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the660 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
661 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>661 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
662 ······</p>662 ······</p>
663 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>663 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
664 ····</footer>664 ····</footer>
665 ··</div>665 ··</div>
666 </main>666 </main>
667 </div>667 </div>
668 <script>668 <script>
669 ··function·mermaidLoaded()·{669 ··function·mermaidLoaded()·{
670 ····mermaid.initialize({670 ····mermaid.initialize({
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171 ······<p·class="built-using">171 ······<p·class="built-using">
172 ········Built·using172 ········Built·using
173 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the173 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
174 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>174 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
175 ······</p>175 ······</p>
176 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>176 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
177 ····</footer>177 ····</footer>
178 ··</div>178 ··</div>
179 </main>179 </main>
180 </div>180 </div>
181 <script>181 <script>
182 ··function·mermaidLoaded()·{182 ··function·mermaidLoaded()·{
183 ····mermaid.initialize({183 ····mermaid.initialize({
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117 <h2·id="simple-examples"·class="section-heading">117 <h2·id="simple-examples"·class="section-heading">
118 ··<a·href="#simple-examples"·class="hover-link">118 ··<a·href="#simple-examples"·class="hover-link">
119 ····<i·class="ri-link-m"·aria-hidden="true"></i>119 ····<i·class="ri-link-m"·aria-hidden="true"></i>
120 ··</a>120 ··</a>
121 ··<span·class="text">Simple·Examples</span>121 ··<span·class="text">Simple·Examples</span>
122 </h2>122 </h2>
123 <p>This·section·starts·with·a·simple·example,·showing·a·generator·and·a·filter:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="8019684297-1">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="801968[·...·truncated·by·diffoscope;·len:·650,·SHA:·0ed8d0092daba7cb8b6c5aa4de36573b0cf62ad3af80be494cd015af3d27648b·...·]-1">]</span><span·class="p">.</span><span·class="w">123 <p>This·section·starts·with·a·simple·example,·showing·a·generator·and·a·filter:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="4665989502-1">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="466598[·...·truncated·by·diffoscope;·len:·650,·SHA:·b5ceb7407078642ba1ccdca48d318da35cd7aea4a07384a1bec046c3c3718253·...·]-1">]</span><span·class="p">.</span><span·class="w">
124 </span><span·class="p"·data-group-id="8019684297-3">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·3671843a7e917c7274d767e11bfa5f63034bf0a24c371c3ba229d23cc45b13fb·...·]-3">]</span></code></pre><p>This·is·read·as·follows:·The·list·of·X·such·that·X·is·taken·from·the·list124 </span><span·class="p"·data-group-id="4665989502-3">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·de87c9a84f778e4890ad026a3298de11fb12a57b6c6666640b9ea6d6d4479f78·...·]-3">]</span></code></pre><p>This·is·read·as·follows:·The·list·of·X·such·that·X·is·taken·from·the·list
125 <code·class="inline">[1,2,a,...]</code>·and·X·is·greater·than·3.</p><p>The·notation·<code·class="inline">X·&lt;-·[1,2,a,...]</code>·is·a·generator·and·the·expression·<code·class="inline">X·&gt;·3</code>·is·a125 <code·class="inline">[1,2,a,...]</code>·and·X·is·greater·than·3.</p><p>The·notation·<code·class="inline">X·&lt;-·[1,2,a,...]</code>·is·a·generator·and·the·expression·<code·class="inline">X·&gt;·3</code>·is·a
126 filter.</p><p>An·additional·filter,·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_integer/1"><code·class="inline">is_integer(X)</code></a>,·can·be·added·to126 filter.</p><p>An·additional·filter,·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_integer/1"><code·class="inline">is_integer(X)</code></a>,·can·be·added·to
127 restrict·the·result·to·integers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="7418418580-1">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="741841[·...·truncated·by·diffoscope;·len:·862,·SHA:·9e4cbca459626afa69a4fccc4957bb8b84bee2f377d979fac9cc289ce0e41426·...·]-1">]</span><span·class="p">.</span><span·class="w">127 restrict·the·result·to·integers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="2219170112-1">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="221917[·...·truncated·by·diffoscope;·len:·862,·SHA:·820c6970aaa81e959a6e65e349a835a1901854b33712485329e3a0e1350142ab·...·]-1">]</span><span·class="p">.</span><span·class="w">
128 </span><span·class="p"·data-group-id="7418418580-4">[</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="7418418580-4">]</span></code></pre><p>Generators·can·be·combined.·For·example,·the·Cartesian·product·of·two·lists·can128 </span><span·class="p"·data-group-id="2219170112-4">[</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="2219170112-4">]</span></code></pre><p>Generators·can·be·combined.·For·example,·the·Cartesian·product·of·two·lists·can
129 be·written·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="2407116028-1">[</span><span·class="p"·data-group-id="2407116028-2">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="2407116028-2">}</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·738,·SHA:·4d46ce48b23ec6746fee09dcc00846c388af9a897e16847fe7d52d0e650306b0·...·]-1">]</span><span·class="p">.</span><span·class="w">129 be·written·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="2890370252-1">[</span><span·class="p"·data-group-id="2890370252-2">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="2890370252-2">}</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·738,·SHA:·74bf216ef89ba57a631e77690b593355404733b0904cd705a1379fbad255d25a·...·]-1">]</span><span·class="p">.</span><span·class="w">
130 </span><span·class="p"·data-group-id="2407116028-5">[</span><span·class="p"·data-group-id="2407116028-6">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="2407116028-6">}</span><span·class="p">,</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·1010,·SHA:·f3c3db8d2440a9d0c1f6a85529fe739a2efe451b43739a6239d739129539b780·...·]-5">]</span></code></pre><h2·id="quick-sort"·class="section-heading">130 </span><span·class="p"·data-group-id="2890370252-5">[</span><span·class="p"·data-group-id="2890370252-6">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="2890370252-6">}</span><span·class="p">,</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·1010,·SHA:·1243e37e5eb7637f08520f64e16137f794920dbe962106ac1aa8573bd475e71e·...·]-5">]</span></code></pre><h2·id="quick-sort"·class="section-heading">
131 ··<a·href="#quick-sort"·class="hover-link">131 ··<a·href="#quick-sort"·class="hover-link">
132 ····<i·class="ri-link-m"·aria-hidden="true"></i>132 ····<i·class="ri-link-m"·aria-hidden="true"></i>
133 ··</a>133 ··</a>
134 ··<span·class="text">Quick·Sort</span>134 ··<span·class="text">Quick·Sort</span>
135 </h2>135 </h2>
136 <p>The·well-known·quick·sort·routine·can·be·written·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sort</span><span·class="p"·data-group-id="7810862739-1">(</span><span·class="p"·data-group-id="7810862739-2">[</span><span·class="p"·data-group-id="7810862739-2">]</span><span·class="p"·data-group-id="7810862739-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·53523402ac04b6576a7bb196dcc7dda6e9241cef5626203490d8d2b40195d983·...·]-3">]</span><span·class="p">;</span><span·class="w">136 <p>The·well-known·quick·sort·routine·can·be·written·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sort</span><span·class="p"·data-group-id="1894232452-1">(</span><span·class="p"·data-group-id="1894232452-2">[</span><span·class="p"·data-group-id="1894232452-2">]</span><span·class="p"·data-group-id="1894232452-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·195a644b3df00e0a3c181b983ef4a445d4e46e42cb0789a15be8b09f57d80fc6·...·]-3">]</span><span·class="p">;</span><span·class="w">
137 </span><span·class="nf">sort</span><span·class="p"·data-group-id="7810862739-4">(</span><span·class="p"·data-group-id="7810862739-5">[</span><span·class="p">_</span><span·class="p"·data-group-id="7810862739-5">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·cl[·...·truncated·by·diffoscope;·len:·33,·SHA:·40b4876c227ba4ed4dcee233004501edac61d38196fb56425669edc78e0ed0f8·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">L</span><span·class="p">;</span><span·class="w">137 </span><span·class="nf">sort</span><span·class="p"·data-group-id="1894232452-4">(</span><span·class="p"·data-group-id="1894232452-5">[</span><span·class="p">_</span><span·class="p"·data-group-id="1894232452-5">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·cl[·...·truncated·by·diffoscope;·len:·33,·SHA:·4d239bb3b3c02731cd3b1b956e1dcd49d22282741c5be327c6a117f4a849be5a·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">L</span><span·class="p">;</span><span·class="w">
138 </span><span·class="nf">sort</span><span·class="p"·data-group-id="7810862739-6">(</span><span·class="p"·data-group-id="7810862739-7">[</span><span·class="n">Pivot</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7810862739-7">]</span><span·class="p"·data-group-id="7810862739-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 </span><span·class="nf">sort</span><span·class="p"·data-group-id="1894232452-6">(</span><span·class="p"·data-group-id="1894232452-7">[</span><span·class="n">Pivot</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="1894232452-7">]</span><span·class="p"·data-group-id="1894232452-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ····</span><span·class="nf">sort</span><span·class="p"·data-group-id="7810862739-8">(</span><span·class="p"·data-group-id="7810862739-9">[</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·333,·SHA:·80b7abd11c32dcac8562b5ca775b08f9d8f594d49f36d8bfc6a0974fe798ca60·...·]-8">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">139 ····</span><span·class="nf">sort</span><span·class="p"·data-group-id="1894232452-8">(</span><span·class="p"·data-group-id="1894232452-9">[</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·333,·SHA:·a83194363b8e779366a3fc62e9853c9e2f9578fc2ef858506e25496e159d4362·...·]-8">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">
140 ····</span><span·class="p"·data-group-id="7810862739-10">[</span><span·class="n">Pivot</span><span·class="p"·data-group-id="7810862739-10">]</span><span·class="w">·</span><span·class="o">++</span><span·class="w">140 ····</span><span·class="p"·data-group-id="1894232452-10">[</span><span·class="n">Pivot</span><span·class="p"·data-group-id="1894232452-10">]</span><span·class="w">·</span><span·class="o">++</span><span·class="w">
141 ····</span><span·class="nf">sort</span><span·class="p"·data-group-id="7810862739-11">(</span><span·class="p"·data-group-id="7810862739-12">[</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·337,·SHA:·0313f7ae5100474fd58fdc745a7e89367a7399ec6b87d9b8f2ddb62b3bac1ffd·...·]-11">)</span><span·class="p">.</span></code></pre><p>The·expression·<code·class="inline">[X·||·X·&lt;-·T,·X·&lt;·Pivot]</code>·is·the·list·of·all·elements·in·<code·class="inline">T</code>141 ····</span><span·class="nf">sort</span><span·class="p"·data-group-id="1894232452-11">(</span><span·class="p"·data-group-id="1894232452-12">[</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·337,·SHA:·2e47a724a77f6acc1befc3df37795bc1acfc3b9a7138dcc67a8f132b2a3ecd77·...·]-11">)</span><span·class="p">.</span></code></pre><p>The·expression·<code·class="inline">[X·||·X·&lt;-·T,·X·&lt;·Pivot]</code>·is·the·list·of·all·elements·in·<code·class="inline">T</code>
142 that·are·less·than·<code·class="inline">Pivot</code>.</p><p><code·class="inline">[X·||·X·&lt;-·T,·X·&gt;=·Pivot]</code>·is·the·list·of·all·elements·in·<code·class="inline">T</code>·that·are·greater142 that·are·less·than·<code·class="inline">Pivot</code>.</p><p><code·class="inline">[X·||·X·&lt;-·T,·X·&gt;=·Pivot]</code>·is·the·list·of·all·elements·in·<code·class="inline">T</code>·that·are·greater
143 than·or·equal·to·<code·class="inline">Pivot</code>.</p><p>With·the·algorithm·above,·a·list·is·sorted·as·follows:</p><ul><li>A·list·with·zero·or·one·element·is·trivially·sorted.</li><li>For·lists·with·more·than·one·element:<ol><li>The·first·element·in·the·list·is·isolated·as·the·pivot·element.</li><li>The·remaining·list·is·partitioned·into·two·sublists,·such·that:</li></ol><ul><li>The·first·sublist·contains·all·elements·that·are·smaller·than·the·pivot143 than·or·equal·to·<code·class="inline">Pivot</code>.</p><p>With·the·algorithm·above,·a·list·is·sorted·as·follows:</p><ul><li>A·list·with·zero·or·one·element·is·trivially·sorted.</li><li>For·lists·with·more·than·one·element:<ol><li>The·first·element·in·the·list·is·isolated·as·the·pivot·element.</li><li>The·remaining·list·is·partitioned·into·two·sublists,·such·that:</li></ol><ul><li>The·first·sublist·contains·all·elements·that·are·smaller·than·the·pivot
144 element.</li><li>The·second·sublist·contains·all·elements·that·are·greater·than·or·equal·to144 element.</li><li>The·second·sublist·contains·all·elements·that·are·greater·than·or·equal·to
145 the·pivot·element.</li></ul><ol><li>The·sublists·are·recursively·sorted·by·the·same·algorithm·and·the·results145 the·pivot·element.</li></ul><ol><li>The·sublists·are·recursively·sorted·by·the·same·algorithm·and·the·results
146 are·combined,·resulting·in·a·list·consisting·of:</li></ol><ul><li>All·elements·from·the·first·sublist,·that·is·all·elements·smaller·than·the146 are·combined,·resulting·in·a·list·consisting·of:</li></ol><ul><li>All·elements·from·the·first·sublist,·that·is·all·elements·smaller·than·the
147 pivot·element,·in·sorted·order.</li><li>The·pivot·element.</li><li>All·elements·from·the·second·sublist,·that·is·all·elements·greater·than·or147 pivot·element,·in·sorted·order.</li><li>The·pivot·element.</li><li>All·elements·from·the·second·sublist,·that·is·all·elements·greater·than·or
148 equal·to·the·pivot·element,·in·sorted·order.</li></ul></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>While·the·sorting·algorithm·as·shown·above·serves·as·a·nice·example·to148 equal·to·the·pivot·element,·in·sorted·order.</li></ul></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>While·the·sorting·algorithm·as·shown·above·serves·as·a·nice·example·to
Offset 151, 93 lines modifiedOffset 151, 93 lines modified
151 <a·href="../../lib/stdlib-6.2.2/doc/html/lists.html"><code·class="inline">lists</code></a>·module·contains·sorting·functions·that·are·implemented·in·a·more151 <a·href="../../lib/stdlib-6.2.2/doc/html/lists.html"><code·class="inline">lists</code></a>·module·contains·sorting·functions·that·are·implemented·in·a·more
152 efficient·way.</p></section><h2·id="permutations"·class="section-heading">152 efficient·way.</p></section><h2·id="permutations"·class="section-heading">
153 ··<a·href="#permutations"·class="hover-link">153 ··<a·href="#permutations"·class="hover-link">
154 ····<i·class="ri-link-m"·aria-hidden="true"></i>154 ····<i·class="ri-link-m"·aria-hidden="true"></i>
155 ··</a>155 ··</a>
156 ··<span·class="text">Permutations</span>156 ··<span·class="text">Permutations</span>
157 </h2>157 </h2>
158 <p>The·following·example·generates·all·permutations·of·the·elements·in·a·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">perms</span><span·class="p"·data-group-id="7720239343-1">(</span><span·class="p"·data-group-id="7720239343-2">[</span><span·class="p"·data-group-id="7720239343-2">]</span><span·class="p"·data-group-id="7720239343-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7720239343-3">[</span><span·class="p"·data-group-id="7720239343-4">[</span><span·class="p"·data-group-id="7720239343-4">]</span><span·class="p"·data-group-id="7720239343-3">]</span><span·class="p">;</span><span·class="w"> 
159 </span><span·class="nf">perms</span><span·class="p"·data-group-id="7720239343-5">(</span><span·class="n">L</span><span·class="p"·data-group-id="7720239343-5">)</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·1101,·SHA:·5699d76de402776de2f481a5021331ec50b5932126b3fb5d69fd2a658bcc662a·...·]158 <p>The·following·example·generates·all·permutations·of·the·elements·in·a·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">perms</span><span·class="p"·data-group-id="7662751558-1">(</span><span·class="p"·data-group-id="7662751558-2">[·...·truncated·by·diffoscope;·len:·442,·SHA:·583fc4f39ab8208ad1140346fb7f8f08eacbac89996c6c4ef762a295414a6a02·...·]
 159 </span><span·class="nf">perms</span><span·class="p"·data-group-id="7662751558-5">(</span><span·class="n">L</span><span·class="p"·data-group-id="7662751558-5">)</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7662751558-6">[</span><span·class="p"·data-group-id="7662751558-7">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7662751558-7">]</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">H</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">perms</span><span·class="p"·data-group-id="7662751558-8">(</span><span·class="n">L</span><span·class="o">--</span><span·class="p"·data-group-id="7662751558-9">[</span><span·class="n">H</span><span·class="p"·data-group-id="7662751558-9">]</span><span·class="p"·data-group-id="7662751558-8">)</span><span·class="p"·data-group-id="7662751558-6">]</span><span·class="p">.</span></code></pre><p>This·takes·<code·class="inline">H</code>·from·<code·class="inline">L</code>·in·all·possible·ways.·The·result·is·the·set·of·all·lists
160 <code·class="inline">[H|T]</code>,·where·<code·class="inline">T</code>·is·the·set·of·all·possible·permutations·of·<code·class="inline">L</code>,·with·<code·class="inline">H</code>160 <code·class="inline">[H|T]</code>,·where·<code·class="inline">T</code>·is·the·set·of·all·possible·permutations·of·<code·class="inline">L</code>,·with·<code·class="inline">H</code>
161 removed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">perms</span><span·class="p"·data-group-id="9372277243-1">(</span><span·class="p"·data-group-id="9372277243-2">[</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">u</span><span·class="p">,</span><span·class="ss">g</span><span·class="p"·data-group-id="9372277243-2">]</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·ce30846054e9d9f5b15ab2f397b94f1532ea91a797191124ac93fa12295eed78·...·]-1">)</span><span·class="p">.</span><span·class="w">161 removed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">perms</span><span·class="p"·data-group-id="3614999899-1">(</span><span·class="p"·data-group-id="3614999899-2">[</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">u</span><span·class="p">,</span><span·class="ss">g</span><span·class="p"·data-group-id="3614999899-2">]</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·aedd2d66c9f7f2b77a0566415da76a7f639565204653b7eacf96c7154561ac1b·...·]-1">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="p"·data-group-id="9372277243-3">[</span><span·class="p"·data-group-id="9372277243-4">[</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">u</span><span·class="p">,</span><span·class="ss">g</span><span·class="p"·data-group-id="9372277243-4">]</span><span[·...·truncated·by·diffoscope;·len:·1301,·SHA:·529a155c5a7cd724054962ce56653248e6fe22d4ea8d54ee55b621406e3076ab·...·]-3">]</span></code></pre><h2·id="pythagorean-triplets"·class="section-heading">162 </span><span·class="p"·data-group-id="3614999899-3">[</span><span·class="p"·data-group-id="3614999899-4">[</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">u</span><span·class="p">,</span><span·class="ss">g</span><span·class="p"·data-group-id="3614999899-4">]</span><span[·...·truncated·by·diffoscope;·len:·1301,·SHA:·eba84347a84118d6524bcac64f90764dcec0fdb1797f50f769040f734f6c892e·...·]-3">]</span></code></pre><h2·id="pythagorean-triplets"·class="section-heading">
163 ··<a·href="#pythagorean-triplets"·class="hover-link">163 ··<a·href="#pythagorean-triplets"·class="hover-link">
164 ····<i·class="ri-link-m"·aria-hidden="true"></i>164 ····<i·class="ri-link-m"·aria-hidden="true"></i>
165 ··</a>165 ··</a>
166 ··<span·class="text">Pythagorean·Triplets</span>166 ··<span·class="text">Pythagorean·Triplets</span>
167 </h2>167 </h2>
168 <p>Pythagorean·triplets·are·sets·of·integers·<code·class="inline">{A,B,C}</code>·such·that168 <p>Pythagorean·triplets·are·sets·of·integers·<code·class="inline">{A,B,C}</code>·such·that
169 <code·class="inline">A**2·+·B**2·=·C**2</code>.</p><p>The·function·<code·class="inline">pyth(N)</code>·generates·a·list·of·all·integers·<code·class="inline">{A,B,C}</code>·such·that169 <code·class="inline">A**2·+·B**2·=·C**2</code>.</p><p>The·function·<code·class="inline">pyth(N)</code>·generates·a·list·of·all·integers·<code·class="inline">{A,B,C}</code>·such·that
170 <code·class="inline">A**2·+·B**2·=·C**2</code>·and·where·the·sum·of·the·sides·is·equal·to,·or·less·than,170 <code·class="inline">A**2·+·B**2·=·C**2</code>·and·where·the·sum·of·the·sides·is·equal·to,·or·less·than,
171 <code·class="inline">N</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">pyth</span><span·class="p"·data-group-id="2856317792-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="2856317792-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 <code·class="inline">N</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">pyth</span><span·class="p"·data-group-id="6134968220-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="6134968220-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ····</span><span·class="p"·data-group-id="2856317792-2">[</span><span·class="w">·</span><span·class="p"·data-group-id="2856317792-3">{</span><span·class="n">A</span><span·class="p">,</span><span·class="n">B</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="285631[·...·truncated·by·diffoscope;·len:·4,·SHA:·1be1c6f083ce2c0ec0a52f12fed482e6af2e43ea9654612369a8b88dbb56602b·...·]-3">}</span><span·class="w">·</span><span·class="p">||</span><span·class="w">172 ····</span><span·class="p"·data-group-id="6134968220-2">[</span><span·class="w">·</span><span·class="p"·data-group-id="6134968220-3">{</span><span·class="n">A</span><span·class="p">,</span><span·class="n">B</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="613496[·...·truncated·by·diffoscope;·len:·4,·SHA:·f223bccd09b2dbe3f74e556d6147e964a013ea96404e3c90a9af88fcdf67ec3b·...·]-3">}</span><span·class="w">·</span><span·class="p">||</span><span·class="w">
173 ········</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="2856317792-4">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="2856317792-4">)</span><span·class="p">,</span><span·class="w">173 ········</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="6134968220-4">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="6134968220-4">)</span><span·class="p">,</span><span·class="w">
174 ········</span><span·class="n">B</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="2856317792-5">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="2856317792-5">)</span><span·class="p">,</span><span·class="w">174 ········</span><span·class="n">B</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="6134968220-5">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="6134968220-5">)</span><span·class="p">,</span><span·class="w">
175 ········</span><span·class="n">C</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="2856317792-6">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="2856317792-6">)</span><span·class="p">,</span><span·class="w">175 ········</span><span·class="n">C</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="6134968220-6">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="6134968220-6">)</span><span·class="p">,</span><span·class="w">
176 ········</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">+</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">176 ········</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">+</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">
177 ········</span><span·class="n">A</span><span·class="o">*</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">*</span><span·class="n">B</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">C</span><span·class="o">*</span><span·class="n">C</span><span·class="w">177 ········</span><span·class="n">A</span><span·class="o">*</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">*</span><span·class="n">B</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">C</span><span·class="o">*</span><span·class="n">C</span><span·class="w">
178 ····</span><span·class="p"·data-group-id="2856317792-2">]</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="1406526383-1">(</span><span·class="mi">3</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·8b866b8f983c3ef37bbffee80cd68fc32a028dc084efac8d5bd46f3448f82dc0·...·]-1">)</span><span·class="p">.</span><span·class="w">178 ····</span><span·class="p"·data-group-id="6134968220-2">]</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="9900406061-1">(</span><span·class="mi">3</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·40fed3af4414135afb53a42b1cfc22d606b58196307cf2a44cedf5ff94d7c6ea·...·]-1">)</span><span·class="p">.</span><span·class="w">
179 </span><span·class="p"·data-group-id="1406526383-2">[</span><span·class="p"·data-group-id="1406526383-2">]</span><span·class="p">.</span><span·class="gp·unselectable">179 </span><span·class="p"·data-group-id="9900406061-2">[</span><span·class="p"·data-group-id="9900406061-2">]</span><span·class="p">.</span><span·class="gp·unselectable">
180 &gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="1406526383-3">(</span><span·class="mi">11</span><span·class="p"·data-group-id="1406526383-3">)</span><span·class="p">.</span><span·class="w">180 &gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="9900406061-3">(</span><span·class="mi">11</span><span·class="p"·data-group-id="9900406061-3">)</span><span·class="p">.</span><span·class="w">
181 </span><span·class="p"·data-group-id="1406526383-4">[</span><span·class="p"·data-group-id="1406526383-4">]</span><span·class="p">.</span><span·class="gp·unselectable">181 </span><span·class="p"·data-group-id="9900406061-4">[</span><span·class="p"·data-group-id="9900406061-4">]</span><span·class="p">.</span><span·class="gp·unselectable">
182 &gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="1406526383-5">(</span><span·class="mi">12</span><span·class="p"·data-group-id="1406526383-5">)</span><span·class="p">.</span><span·class="w">182 &gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="9900406061-5">(</span><span·class="mi">12</span><span·class="p"·data-group-id="9900406061-5">)</span><span·class="p">.</span><span·class="w">
183 </span><span·class="p"·data-group-id="1406526383-6">[</span><span·class="p"·data-group-id="1406526383-7">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="1406526383-7">}</span><span[·...·truncated·by·diffoscope;·len:·289,·SHA:·98c7c0516196a5b0826f2fcda569d80902a83f2ecc1d9b665f8cd695c67ab139·...·]-6">]</span><span·class="gp·unselectable">183 </span><span·class="p"·data-group-id="9900406061-6">[</span><span·class="p"·data-group-id="9900406061-7">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9900406061-7">}</span><span[·...·truncated·by·diffoscope;·len:·289,·SHA:·f2b5fb8843a5176dd55bf15b63ec6b7685a29eb2e9c93c2bfff9d5b1e0c894b0·...·]-6">]</span><span·class="gp·unselectable">
184 &gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="1406526383-9">(</span><span·class="mi">50</span><span·class="p"·data-group-id="1406526383-9">)</span><span·class="p">.</span><span·class="w">184 &gt;·</span><span·class="nf">pyth</span><span·class="p"·data-group-id="9900406061-9">(</span><span·class="mi">50</span><span·class="p"·data-group-id="9900406061-9">)</span><span·class="p">.</span><span·class="w">
185 </span><span·class="p"·data-group-id="1406526383-10">[</span><span·class="p"·data-group-id="1406526383-11">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="1406526383-11">}</span><span·class="p">,</span><span·class="w">185 </span><span·class="p"·data-group-id="9900406061-10">[</span><span·class="p"·data-group-id="9900406061-11">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9900406061-11">}</span><span·class="p">,</span><span·class="w">
186 ·</span><span·class="p"·data-group-id="1406526383-12">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="1406526383-12">}</span><span·class="p">,</span><span·class="w">186 ·</span><span·class="p"·data-group-id="9900406061-12">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9900406061-12">}</span><span·class="p">,</span><span·class="w">
187 ·</span><span·class="p"·data-group-id="1406526383-13">{</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">13</span><span·class="p"·data-group-id="1406526383-13">}</span><span·class="p">,</span><span·class="w">187 ·</span><span·class="p"·data-group-id="9900406061-13">{</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">13</span><span·class="p"·data-group-id="9900406061-13">}</span><span·class="p">,</span><span·class="w">
188 ·</span><span·class="p"·data-group-id="1406526383-14">{</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="1406526383-14">}</span><span·class="p">,</span><span·class="w">188 ·</span><span·class="p"·data-group-id="9900406061-14">{</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="9900406061-14">}</span><span·class="p">,</span><span·class="w">
189 ·</span><span·class="p"·data-group-id="1406526383-15">{</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="1406526383-15">}</span><span·class="p">,</span><span·class="w">189 ·</span><span·class="p"·data-group-id="9900406061-15">{</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="9900406061-15">}</span><span·class="p">,</span><span·class="w">
190 ·</span><span·class="p"·data-group-id="1406526383-16">{</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="1406526383-16">}</span><span·class="p">,</span><span·class="w">190 ·</span><span·class="p"·data-group-id="9900406061-16">{</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="9900406061-16">}</span><span·class="p">,</span><span·class="w">
191 ·</span><span·class="p"·data-group-id="1406526383-17">{</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">15</span><span·class="p"·data-group-id="1406526383-17">}</span><span·class="p">,</span><span·class="w">191 ·</span><span·class="p"·data-group-id="9900406061-17">{</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">15</span><span·class="p"·data-group-id="9900406061-17">}</span><span·class="p">,</span><span·class="w">
192 ·</span><span·class="p"·data-group-id="1406526383-18">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">13</span><span·class="p"·data-group-id="1406526383-18">}</span><span·class="p">,</span><span·class="w">192 ·</span><span·class="p"·data-group-id="9900406061-18">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">13</span><span·class="p"·data-group-id="9900406061-18">}</span><span·class="p">,</span><span·class="w">
193 ·</span><span·class="p"·data-group-id="1406526383-19">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">15</span><span·class="p"·data-group-id="1406526383-19">}</span><span·class="p">,</span><span·class="w">193 ·</span><span·class="p"·data-group-id="9900406061-19">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">15</span><span·class="p"·data-group-id="9900406061-19">}</span><span·class="p">,</span><span·class="w">
194 ·</span><span·class="p"·data-group-id="1406526383-20">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">20</span><span·class="p"·data-group-id="1406526383-20">}</span><span·class="p">,</span><span·class="w">194 ·</span><span·class="p"·data-group-id="9900406061-20">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">20</span><span·class="p"·data-group-id="9900406061-20">}</span><span·class="p">,</span><span·class="w">
195 ·</span><span·class="p"·data-group-id="1406526383-21">{</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="1406526383-21">}</span><span·class="p">,</span><span·class="w">195 ·</span><span·class="p"·data-group-id="9900406061-21">{</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="9900406061-21">}</span><span·class="p">,</span><span·class="w">
196 ·</span><span·class="p"·data-group-id="1406526383-22">{</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">20</span><span·class="p"·data-group-id="1406526383-22">}</span><span·class="p"·data-group-id="1406526383-10">]</span[·...·truncated·by·diffoscope;·len:·282,·SHA:·0c98ee75353a3d9c236fec51cb794d170ed37e6950654c40da3c5d34251889f6·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">196 ·</span><span·class="p"·data-group-id="9900406061-22">{</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="mi">20</span><span·class="p"·data-group-id="9900406061-22">}</span><span·class="p"·data-group-id="9900406061-10">]</span[·...·truncated·by·diffoscope;·len:·282,·SHA:·fadba4abca291d3a5a8208786c4b989f132ce9d26b6afd59c667d90c09139a67·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
197 ···</span><span·class="p"·data-group-id="0983878240-2">[</span><span·class="p"·data-group-id="0983878240-3">{</span><span·class="n">A</span><span·class="p">,</span><span·class="n">B</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="0983878240-3">}</span><span·class="w">·</span><span·class="p">||</span><span·class="w">197 ···</span><span·class="p"·data-group-id="0713391947-2">[</span><span·class="p"·data-group-id="0713391947-3">{</span><span·class="n">A</span><span·class="p">,</span><span·class="n">B</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="0713391947-3">}</span><span·class="w">·</span><span·class="p">||</span><span·class="w">
198 ·······</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0983878240-4">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">2</span><span·class="p"·data-group-id="0983878240-4">)</span><span·class="p">,</span><span·class="w">198 ·······</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0713391947-4">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">2</span><span·class="p"·data-group-id="0713391947-4">)</span><span·class="p">,</span><span·class="w">
199 ·······</span><span·class="n">B</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0983878240-5">(</span><span·class="n">A</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="0983878240-5">)</span><span·class="p">,</span><span·class="w">199 ·······</span><span·class="n">B</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0713391947-5">(</span><span·class="n">A</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="0713391947-5">)</span><span·class="p">,</span><span·class="w">
200 ·······</span><span·class="n">C</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0983878240-6">(</span><span·class="n">B</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="0983878240-6">)</span><span·class="p">,</span><span·class="w">200 ·······</span><span·class="n">C</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0713391947-6">(</span><span·class="n">B</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="0713391947-6">)</span><span·class="p">,</span><span·class="w">
201 ·······</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">+</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">201 ·······</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">+</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">
202 ·······</span><span·class="n">A</span><span·class="o">*</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">*</span><span·class="n">B</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">C</span><span·class="o">*</span><span·class="n">C</span><span·class="w">·</span><span·class="p"·data-group-id="0983878240-2">]</span><span·class="p">.</span></code></pre><h2·id="simplifications-with-list-comprehensions"·class="section-heading">202 ·······</span><span·class="n">A</span><span·class="o">*</span><span·class="n">A</span><span·class="o">+</span><span·class="n">B</span><span·class="o">*</span><span·class="n">B</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">C</span><span·class="o">*</span><span·class="n">C</span><span·class="w">·</span><span·class="p"·data-group-id="0713391947-2">]</span><span·class="p">.</span></code></pre><h2·id="simplifications-with-list-comprehensions"·class="section-heading">
203 ··<a·href="#simplifications-with-list-comprehensions"·class="hover-link">203 ··<a·href="#simplifications-with-list-comprehensions"·class="hover-link">
204 ····<i·class="ri-link-m"·aria-hidden="true"></i>204 ····<i·class="ri-link-m"·aria-hidden="true"></i>
205 ··</a>205 ··</a>
206 ··<span·class="text">Simplifications·With·List·Comprehensions</span>206 ··<span·class="text">Simplifications·With·List·Comprehensions</span>
207 </h2>207 </h2>
208 <p>As·an·example,·list·comprehensions·can·be·used·to·simplify·some·of·the·functions208 <p>As·an·example,·list·comprehensions·can·be·used·to·simplify·some·of·the·functions
209 in·<code·class="inline">lists.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append</span><span·class="p"·data-group-id="5163086269-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="5163086269-1">)</span><span·class="w">···</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="p"·data-group-id="5163086269-2">[</span><span·class="n">X</span><s[·...·truncated·by·diffoscope;·len:·410,·SHA:·2f82bf75cb70c33e33c51dcebd93165d66fd485ea2d3a86cf425b1a291fc8521·...·]-2">]</span><span·class="p">.</span><span·class="w">209 in·<code·class="inline">lists.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append</span><span·class="p"·data-group-id="5983317653-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="5983317653-1">)</span><span·class="w">···</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="p"·data-group-id="5983317653-2">[</span><span·class="n">X</span><s[·...·truncated·by·diffoscope;·len:·410,·SHA:·9f0f83279311cfbd9defb6986fc76086aa2dbc8060169eb5a19c918dee77721a·...·]-2">]</span><span·class="p">.</span><span·class="w">
210 </span><span·class="nf">map</span><span·class="p"·data-group-id="5163086269-3">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="5163086269-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·439,·SHA:·6a7558b28219cf3db188948768a6710333def95b9c066aaec429c8566dc207d3·...·]-4">]</span><span·class="p">.</span><span·class="w">210 </span><span·class="nf">map</span><span·class="p"·data-group-id="5983317653-3">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="5983317653-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·439,·SHA:·5fbc5cbefbdb4ea94517e34bfbf663ece3a595e2674e94ad46f31679bc8e3017·...·]-4">]</span><span·class="p">.</span><span·class="w">
211 </span><span·class="nf">filter</span><span·class="p"·data-group-id="5163086269-6">(</span><span·class="n">Pred</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="5163086269-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·513,·SHA:·d7a7341c78752d9a1f5459d50cbb95b06818247a9d4da2ab18ca6227770f4f01·...·]-7">]</span><span·class="p">.</span></code></pre><h2·id="variable-bindings-in-list-comprehensions"·class="section-heading">211 </span><span·class="nf">filter</span><span·class="p"·data-group-id="5983317653-6">(</span><span·class="n">Pred</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="5983317653-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·513,·SHA:·fdb9a2b37d24a33c6a81125c6002cacc1fb8f75aa5d903e1acfaec6807293ff8·...·]-7">]</span><span·class="p">.</span></code></pre><h2·id="variable-bindings-in-list-comprehensions"·class="section-heading">
212 ··<a·href="#variable-bindings-in-list-comprehensions"·class="hover-link">212 ··<a·href="#variable-bindings-in-list-comprehensions"·class="hover-link">
213 ····<i·class="ri-link-m"·aria-hidden="true"></i>213 ····<i·class="ri-link-m"·aria-hidden="true"></i>
214 ··</a>214 ··</a>
215 ··<span·class="text">Variable·Bindings·in·List·Comprehensions</span>215 ··<span·class="text">Variable·Bindings·in·List·Comprehensions</span>
216 </h2>216 </h2>
217 <p>The·scope·rules·for·variables·that·occur·in·list·comprehensions·are·as·follows:</p><ul><li>All·variables·that·occur·in·a·generator·pattern·are·assumed·to·be·&quot;fresh&quot;217 <p>The·scope·rules·for·variables·that·occur·in·list·comprehensions·are·as·follows:</p><ul><li>All·variables·that·occur·in·a·generator·pattern·are·assumed·to·be·&quot;fresh&quot;
218 variables.</li><li>Any·variables·that·are·defined·before·the·list·comprehension,·and·that·are218 variables.</li><li>Any·variables·that·are·defined·before·the·list·comprehension,·and·that·are
219 used·in·filters,·have·the·values·they·had·before·the·list·comprehension.</li><li>Variables·cannot·be·exported·from·a·list·comprehension.</li></ul><p>As·an·example·of·these·rules,·suppose·you·want·to·write·the·function·<code·class="inline">select</code>,219 used·in·filters,·have·the·values·they·had·before·the·list·comprehension.</li><li>Variables·cannot·be·exported·from·a·list·comprehension.</li></ul><p>As·an·example·of·these·rules,·suppose·you·want·to·write·the·function·<code·class="inline">select</code>,
220 which·selects·certain·elements·from·a·list·of·tuples.·Suppose·you·write220 which·selects·certain·elements·from·a·list·of·tuples.·Suppose·you·write
221 <code·class="inline">select(X,·L)·-&gt;·[Y·||·{X,·Y}·&lt;-·L].</code>·with·the·intention·of·extracting·all221 <code·class="inline">select(X,·L)·-&gt;·[Y·||·{X,·Y}·&lt;-·L].</code>·with·the·intention·of·extracting·all
222 tuples·from·<code·class="inline">L</code>,·where·the·first·item·is·<code·class="inline">X</code>.</p><p>Compiling·this·gives·the·following·diagnostic:</p><pre><code·class="text">./FileName.erl:Line:·Warning:·variable·'X'·shadowed·in·generate</code></pre><p>This·diagnostic·warns·that·the·variable·<code·class="inline">X</code>·in·the·pattern·is·not·the·same·as222 tuples·from·<code·class="inline">L</code>,·where·the·first·item·is·<code·class="inline">X</code>.</p><p>Compiling·this·gives·the·following·diagnostic:</p><pre><code·class="text">./FileName.erl:Line:·Warning:·variable·'X'·shadowed·in·generate</code></pre><p>This·diagnostic·warns·that·the·variable·<code·class="inline">X</code>·in·the·pattern·is·not·the·same·as
223 the·variable·<code·class="inline">X</code>·that·occurs·in·the·function·head.</p><p>Evaluating·<code·class="inline">select</code>·gives·the·following·result:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">select</span><span·class="p"·data-group-id="1860419178-1">(</span><span·class="ss">b</span><span·class="p">,</span><span·class="p"·data-group-id="1860419178-2">[</span><span·class="p"·data-group-id="1860419178-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span[·...·truncated·by·diffoscope;·len:·754,·SHA:·fc11cf2d91a02e34dae461f0562153175bac74311285b5268edeada0757becce·...·]-1">)</span><span·class="p">.</span><span·class="w">223 the·variable·<code·class="inline">X</code>·that·occurs·in·the·function·head.</p><p>Evaluating·<code·class="inline">select</code>·gives·the·following·result:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">select</span><span·class="p"·data-group-id="9666303025-1">(</span><span·class="ss">b</span><span·class="p">,</span><span·class="p"·data-group-id="9666303025-2">[</span><span·class="p"·data-group-id="9666303025-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span[·...·truncated·by·diffoscope;·len:·754,·SHA:·7296c586f31ab2b9d124054a58e64255979dbde40e50bd56bc2ca5b2a4adea9b·...·]-1">)</span><span·class="p">.</span><span·class="w">
224 </span><span·class="p"·data-group-id="1860419178-7">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="1860419178-7">]</span></code></pre><p>This·is·not·the·wanted·result.·To·achieve·the·desired·effect,·<code·class="inline">select</code>·must·be224 </span><span·class="p"·data-group-id="9666303025-7">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="9666303025-7">]</span></code></pre><p>This·is·not·the·wanted·result.·To·achieve·the·desired·effect,·<code·class="inline">select</code>·must·be
225 written·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">select</span><span·class="p"·data-group-id="2440443571-1">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="2440443571-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="p"·data-group-id="2440443571-2">[</span><span·class="n">Y</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="p"·data-group-id="2440443571-3">{</span><span·class="n">X1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="2440443571-3">}</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">X1</span><span·class="p"·data-group-id="2440443571-2">]</span><span·class="p">.</span></code></pre><p>The·generator·now·contains·unbound·variables·and·the·test·has·been·moved·into 
226 the·filter.</p><p>This·now·works·as·expected:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">select</span><span·class="p"·data-group-id="6855979471-1">(</span><span·class="ss">b</span><span·cla[·...·truncated·by·diffoscope;·len:·1006,·SHA:·b6e43b8a0e6b8e2a027b97e35bf0d689bf9c051c68389cccfe0696e17a2846d4·...·]225 written·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">select</span><span·class="p"·data-group-id="3716406301-1">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·[·...·truncated·by·diffoscope;·len:·917,·SHA:·ac1e5aadd2b05e91f568d57dfa812d064934157bd05323439474c5654d5ec216·...·]
 226 the·filter.</p><p>This·now·works·as·expected:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">select</span><span·class="p"·data-group-id="5171547248-1">(</span><span·class="ss">b</span><span·class="p">,</span><span·class="p"·data-group-id="5171547248-2">[</span><span·class="p"·data-group-id="5171547248-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5171547248-3">}</span><span·class="p">,</span><span·class="p"·data-group-id="5171547248-4">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5171547248-4">}</span><span·class="p">,</span><span·class="p"·data-group-id="5171547248-5">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="5171547248-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="5171547248-6">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="5171547248-6">}</span><span·class="p"·data-group-id="5171547248-2">]</span><span·class="p"·data-group-id="5171547248-1">)</span><span·class="p">.</span><span·class="w">
227 </span><span·class="p"·data-group-id="6855979471-7">[</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="6855979471-7">]</span></code></pre><p>Also·note·that·a·variable·in·a·generator·pattern·will·shadow·a·variable·with·the227 </span><span·class="p"·data-group-id="5171547248-7">[</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="5171547248-7">]</span></code></pre><p>Also·note·that·a·variable·in·a·generator·pattern·will·shadow·a·variable·with·the
228 same·name·bound·in·a·previous·generator·pattern.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="9244762247-1">[</span><span·class="p"·data-group-id="9244762247-2">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p"·data-group-id="9244762247-2">}</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="9244762247-3">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9244762247-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="o">=</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="9244762247-4">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="9244762247-4">]</span><span·class="p"·data-group-id="9244762247-1">]</span><span·class="p">.</span><span·class="w"> 
229 </span><span·class="p"·data-group-id="9244762247-5">[</span><span·class="p"·data-group-id="9244762247-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="9244762247-6">}</span><span·class="p">[·...·truncated·by·diffoscope;·len:·1775,·SHA:·11ce8ab9a1273def7efb1bb3a4be42c57e003e5651753b9b5ff851b9c996f4df·...·]228 same·name·bound·in·a·previous·generator·pattern.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="6265133359-1">[</span><span·class="p"·data-group-id="6265133359-2">{</[·...·truncated·by·diffoscope;·len:·1050,·SHA:·5b6a0dce5b357ba5c8091aa92cc3a7f15d2b0824812b8a80602a52cab4e1f627·...·]
 229 </span><span·class="p"·data-group-id="6265133359-5">[</span><span·class="p"·data-group-id="6265133359-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="6265133359-6">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-7">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="6265133359-7">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-8">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="6265133359-8">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-9">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="6265133359-9">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-10">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="6265133359-10">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-11">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="6265133359-11">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-12">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="6265133359-12">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-13">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="6265133359-13">}</span><span·class="p">,</span><span·class="p"·data-group-id="6265133359-14">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="6265133359-14">}</span><span·class="p"·data-group-id="6265133359-5">]</span></code></pre><p>A·consequence·of·the·rules·for·importing·variables·into·a·list·comprehensions·is
230 that·certain·pattern·matching·operations·must·be·moved·into·the·filters·and230 that·certain·pattern·matching·operations·must·be·moved·into·the·filters·and
231 cannot·be·written·directly·in·the·generators.</p><p>To·illustrate·this,·do·<em>not</em>·write·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="5735830392-1">(</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5735830392-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 cannot·be·written·directly·in·the·generators.</p><p>To·illustrate·this,·do·<em>not</em>·write·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="3572377215-1">(</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3572377215-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ····</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">232 ····</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
233 ····</span><span·class="p"·data-group-id="5735830392-2">[</span><span·class="w">·</span><span·class="n">Expression</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">PatternInvolving</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·248,·SHA:·a1061b7b414b2d49ce90902bbf43295b3aa6918f5b13ebcb936bdbe88a43d387·...·]-2">]</span><span·class="w">233 ····</span><span·class="p"·data-group-id="3572377215-2">[</span><span·class="w">·</span><span·class="n">Expression</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">PatternInvolving</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·248,·SHA:·44ace7af26cf389161d955948b2360d5763f57a2aec6a7a72110b973f3b7e634·...·]-2">]</span><span·class="w">
234 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Instead,·write·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="3710550281-1">(</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3710550281-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">234 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Instead,·write·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="3886801353-1">(</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3886801353-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
235 ····</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">235 ····</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
236 ····</span><span·class="p"·data-group-id="3710550281-2">[</span><span·class="w">·</span><span·class="n">Expression</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">PatternInvolving</span><span·class="w">·</span><span·class="n">Y1</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·418,·SHA:·9dee5736ebd8ddc52835d42a884a6c2a8bb214ec2e67da269ef53ed6450ed4d8·...·]-2">]</span><span·class="w">236 ····</span><span·class="p"·data-group-id="3886801353-2">[</span><span·class="w">·</span><span·class="n">Expression</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">PatternInvolving</span><span·class="w">·</span><span·class="n">Y1</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·418,·SHA:·4bf3b8290f9cac224000923dd31ca028911d55a976e361621554a63793f9eb28·...·]-2">]</span><span·class="w">
237 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>237 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>
238 </div>238 </div>
  
239 <div·class="bottom-actions"·id="bottom-actions">239 <div·class="bottom-actions"·id="bottom-actions">
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120 ····<i·class="ri-link-m"·aria-hidden="true"></i>120 ····<i·class="ri-link-m"·aria-hidden="true"></i>
121 ··</a>121 ··</a>
122 ··<span·class="text">Creating·a·List</span>122 ··<span·class="text">Creating·a·List</span>
123 </h2>123 </h2>
124 <p>Lists·can·only·be·built·starting·from·the·end·and·attaching·list·elements·at·the124 <p>Lists·can·only·be·built·starting·from·the·end·and·attaching·list·elements·at·the
125 beginning.·If·you·use·the·<code·class="inline">++</code>·operator·as·follows,·a·new·list·is·created·that125 beginning.·If·you·use·the·<code·class="inline">++</code>·operator·as·follows,·a·new·list·is·created·that
126 is·a·copy·of·the·elements·in·<code·class="inline">List1</code>,·followed·by·<code·class="inline">List2</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">List1</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">List2</span></code></pre><p>Looking·at·how·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#append/2"><code·class="inline">lists:append/2</code></a>·or·<code·class="inline">++</code>·would·be·implemented·in·plain·Erlang,126 is·a·copy·of·the·elements·in·<code·class="inline">List1</code>,·followed·by·<code·class="inline">List2</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">List1</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">List2</span></code></pre><p>Looking·at·how·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#append/2"><code·class="inline">lists:append/2</code></a>·or·<code·class="inline">++</code>·would·be·implemented·in·plain·Erlang,
127 clearly·the·first·list·is·copied:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append</span><span·class="p"·data-group-id="1273284323-1">(</span><span·class="p"·data-group-id="1273284323-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="1273284323-2">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·60,·SHA:·d562873a1c7d6fd69ad1f2b854e014b7cf9407256d52fac0e0dffa65bdb66bd3·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">127 clearly·the·first·list·is·copied:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append</span><span·class="p"·data-group-id="6902630146-1">(</span><span·class="p"·data-group-id="6902630146-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="6902630146-2">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·60,·SHA:·ccce13183bf4fe7693cbcb4aa25faebc23792d3ea4f6f5d687d3b0f39d8e1b4c·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
128 ····</span><span·class="p"·data-group-id="1273284323-3">[</span><span·class="n">H</span><span·class="p">|</span><span·class="nf">append</span><span·class="p"·data-group-id="1273284323-4">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·3a8968e7c3db9fd5f3f410dbd65d8b5b182b29e89289d22f18ef6763582044e4·...·]-3">]</span><span·class="p">;</span><span·class="w">128 ····</span><span·class="p"·data-group-id="6902630146-3">[</span><span·class="n">H</span><span·class="p">|</span><span·class="nf">append</span><span·class="p"·data-group-id="6902630146-4">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·8884366e33cbda0633c34ca05a660fd1483a305b3a9f61f9b0efef7ce509fb5c·...·]-3">]</span><span·class="p">;</span><span·class="w">
129 </span><span·class="nf">append</span><span·class="p"·data-group-id="1273284323-5">(</span><span·class="p"·data-group-id="1273284323-6">[</span><span·class="p"·data-group-id="1273284323-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</span><span·class="p"·data-group-id="1273284323-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">129 </span><span·class="nf">append</span><span·class="p"·data-group-id="6902630146-5">(</span><span·class="p"·data-group-id="6902630146-6">[</span><span·class="p"·data-group-id="6902630146-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tail</span><span·class="p"·data-group-id="6902630146-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
130 ····</span><span·class="n">Tail</span><span·class="p">.</span></code></pre><p>When·recursing·and·building·a·list,·it·is·important·to·ensure·that·you·attach130 ····</span><span·class="n">Tail</span><span·class="p">.</span></code></pre><p>When·recursing·and·building·a·list,·it·is·important·to·ensure·that·you·attach
131 the·new·elements·to·the·beginning·of·the·list.·In·this·way,·you·will·build·<em>one</em>131 the·new·elements·to·the·beginning·of·the·list.·In·this·way,·you·will·build·<em>one</em>
132 list,·not·hundreds·or·thousands·of·copies·of·the·growing·result·list.</p><p>Let·us·first·see·how·it·is·not·to·be·done:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bad_fib</span><span·class="p"·data-group-id="6847281133-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="6847281133-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">132 list,·not·hundreds·or·thousands·of·copies·of·the·growing·result·list.</p><p>Let·us·first·see·how·it·is·not·to·be·done:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bad_fib</span><span·class="p"·data-group-id="9362940323-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="9362940323-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
133 ····</span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="6847281133-2">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·130,·SHA:·44228cf70b63641b0c6163ce9dc4c189bf93b91a67b6defa549dc6c4ca6f6dd1·...·]3-2">)</span><span·class="p">.</span><span·class="w">133 ····</span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="9362940323-2">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·130,·SHA:·ed6c341b76f19eed035d6c90b5612dedc51eca4f03c2db19d28da25273af827d·...·]3-2">)</span><span·class="p">.</span><span·class="w">
  
134 </span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="6847281133-4">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Next</span><span·cl[·...·truncated·by·diffoscope;·len:·107,·SHA:·2fcd53b2db879ecdac22c2431895fc97310d3dba20ba0bf08c32dfd61517af29·...·]3-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">134 </span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="9362940323-4">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Next</span><span·cl[·...·truncated·by·diffoscope;·len:·107,·SHA:·0aeb8135bdf305ce4acec176f7f8fec4cb125e2847bca0953167998db0ac58f4·...·]3-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
135 ····</span><span·class="n">Fibs</span><span·class="p">;</span><span·class="w">135 ····</span><span·class="n">Fibs</span><span·class="p">;</span><span·class="w">
136 </span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="6847281133-5">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·58,·SHA:·a5a76a7f136a238f82856093709dfae7794e8eab3b6a78aa57cf5cb74bc0d48f·...·]3-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">136 </span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="9362940323-5">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·58,·SHA:·1c0c7799a7bd96fecc76e3adf4033c759d1346e3de5712befd5b1eb87408f85a·...·]3-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
137 ····</span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="6847281133-6">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·463,·SHA:·16a86f0214522d0863c052eced0a09287f320d0822daf8e4166bde4f4ced5b80·...·]3-6">)</span><span·class="p">.</span></code></pre><p>Here·more·than·one·list·is·built.·In·each·iteration·step·a·new·list·is·created137 ····</span><span·class="nf">bad_fib</span><span·class="p"·data-group-id="9362940323-6">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·463,·SHA:·5b42dee59b46323f60bdb500911e7af65ac90122dc02c0efcc4676ce9446956e·...·]3-6">)</span><span·class="p">.</span></code></pre><p>Here·more·than·one·list·is·built.·In·each·iteration·step·a·new·list·is·created
138 that·is·one·element·longer·than·the·new·previous·list.</p><p>To·avoid·copying·the·result·in·each·iteration,·build·the·list·in·reverse·order138 that·is·one·element·longer·than·the·new·previous·list.</p><p>To·avoid·copying·the·result·in·each·iteration,·build·the·list·in·reverse·order
139 and·reverse·the·list·when·you·are·done:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="9020301847-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="9020301847-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">139 and·reverse·the·list·when·you·are·done:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="5362064536-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="5362064536-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
140 ····</span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="9020301847-2">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·131,·SHA:·144aaacc615369d0477426a6827517f0ac8a2ffe4221eac98ea8f2e98c946d43·...·]-2">)</span><span·class="p">.</span><span·class="w">140 ····</span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="5362064536-2">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·131,·SHA:·d1e977c78fa7a0cdade941d2eafc65a48377b9f83d01606febe448f35a136666·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
141 </span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="9020301847-4">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Next</span><span·cl[·...·truncated·by·diffoscope;·len:·108,·SHA:·aa6cc90422b4251e062f9fe15b4dfd638890a967f4414dbf17828d2fc38ed7fb·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">141 </span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="5362064536-4">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Next</span><span·cl[·...·truncated·by·diffoscope;·len:·108,·SHA:·a46ad6396c5eeed71374f8ad830ce52ef7b231452ae76c672329442db0617349·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
142 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="9020301847-5">(</span><span·class="n">Fibs</span><span·class="p"·data-group-id="9020301847-5">)</span><span·class="p">;</span><span·class="w">142 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="5362064536-5">(</span><span·class="n">Fibs</span><span·class="p"·data-group-id="5362064536-5">)</span><span·class="p">;</span><span·class="w">
143 </span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="9020301847-6">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·59,·SHA:·713c33c582793cac875559880374d36e35104fd5eb3531ac361bed36bae2a744·...·]-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">143 </span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="5362064536-6">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Current</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·59,·SHA:·f5134f983fabb8c46dbb66608d05ac6985cb1a1c690d536f2b82bb66560766f3·...·]-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
144 ····</span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="9020301847-7">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·415,·SHA:·32457fdcc34512ef19663c93de0fc57c088feb28df36f6a26014d9ad9754708f·...·]-7">)</span><span·class="p">.</span></code></pre><h2·id="list-comprehensions"·class="section-heading">144 ····</span><span·class="nf">tail_recursive_fib</span><span·class="p"·data-group-id="5362064536-7">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Next</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·415,·SHA:·fa1a813b58401342973dff8720899b83f7e255477ce1cb6812d438f2f926cbe4·...·]-7">)</span><span·class="p">.</span></code></pre><h2·id="list-comprehensions"·class="section-heading">
145 ··<a·href="#list-comprehensions"·class="hover-link">145 ··<a·href="#list-comprehensions"·class="hover-link">
146 ····<i·class="ri-link-m"·aria-hidden="true"></i>146 ····<i·class="ri-link-m"·aria-hidden="true"></i>
147 ··</a>147 ··</a>
148 ··<span·class="text">List·Comprehensions</span>148 ··<span·class="text">List·Comprehensions</span>
149 </h2>149 </h2>
150 <p>A·list·comprehension:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5299507465-1">[</span><span·class="n">Expr</span><span·class="p"·data-group-id="5299507465-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="5299507465-2">)</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·675,·SHA:·5c66340cdcf86c6a174fb4b33a701b310009ea98d9543c1394df5156db822993·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">150 <p>A·list·comprehension:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5145987451-1">[</span><span·class="n">Expr</span><span·class="p"·data-group-id="5145987451-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="5145987451-2">)</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·675,·SHA:·b30775fd0c3d1d0291e51be40debf8468d2b5e0ef540ff16e1a7c63208ac4608·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
151 ····</span><span·class="p"·data-group-id="3518222001-3">[</span><span·class="n">Expr</span><span·class="p"·data-group-id="3518222001-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="3518222001-4">)</span><span·class="p">|</span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"[·...·truncated·by·diffoscope;·len:·234,·SHA:·49919cc1d618a6602127ac0b55608810f62a4744b7e03c1346b710139f42ac0e·...·]-3">]</span><span·class="p">;</span><span·class="w">151 ····</span><span·class="p"·data-group-id="9548146880-3">[</span><span·class="n">Expr</span><span·class="p"·data-group-id="9548146880-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="9548146880-4">)</span><span·class="p">|</span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"[·...·truncated·by·diffoscope;·len:·234,·SHA:·a3c8926ccc8dd5c4d9b8a18ff8c9e9137aabbdd1d7fdb76a9ba62ba65be8ded1·...·]-3">]</span><span·class="p">;</span><span·class="w">
152 </span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="3518222001-6">(</span><span·class="p"·data-group-id="3518222001-7">[</span><span·class="p"·data-group-id="3518222001-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Expr</span><span·class="p"·data-group-id="3518222001-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3518222001-8">[</span><span·class="p"·data-group-id="3518222001-8">]</span><span·class="p">.</span></code></pre><p>If·the·result·of·the·list·comprehension·will·<em>obviously</em>·not·be·used,·a·list 
153 will·not·be·constructed.·For·example,·in·this·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0541238475-1">[</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·406,·SHA:·af57ffb3222b1d21f3ce1fd3e2802d50803af9b6697aba7d4b7d79368a9bc5b0·...·]152 </span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="9548146880-6">(</span><span·class="p"·data-group-id="9548146880-7">[</span><span·class="p"·data-group-id="9548146880-7">]</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·405,·SHA:·5c1e7f95efc5400505297848493e966ee57ae72163ae8beab0e5067e6e09bab9·...·]
 153 will·not·be·constructed.·For·example,·in·this·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3063875539-1">[</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="3063875539-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="3063875539-2">)</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="n">E</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="n">List</span><span·class="p"·data-group-id="3063875539-1">]</span><span·class="p">,</span><span·class="w">
154 </span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>or·in·this·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">Var</span><span·class="w">·</span><span·class="k">of</span><span·class="w">154 </span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>or·in·this·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">Var</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
155 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">155 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
156 ········</span><span·class="p"·data-group-id="6283469204-1">[</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="6283469204-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="6283469204-2">)</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·220,·SHA:·3cba69e96586d522534afc52c5bac27079dc0bac661890f29dacd609edcbc0ec·...·]-1">]</span><span·class="p">;</span><span·class="w">156 ········</span><span·class="p"·data-group-id="3668278966-1">[</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="3668278966-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="3668278966-2">)</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·220,·SHA:·7c3df19bacc53aafd7f4f9844a9fb40f0e341e0b9743298863c5f50bdcedd292·...·]-1">]</span><span·class="p">;</span><span·class="w">
157 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 </span><span·class="k">end</span><span·class="p">,</span><span·class="w">158 </span><span·class="k">end</span><span·class="p">,</span><span·class="w">
159 </span><span·class="nf">some_function</span><span·class="p"·data-group-id="6283469204-3">(</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="6283469204-3">)</span><span·class="p">,</span></code></pre><p>the·value·is·not·assigned·to·a·variable,·not·passed·to·another·function,·and·not159 </span><span·class="nf">some_function</span><span·class="p"·data-group-id="3668278966-3">(</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3668278966-3">)</span><span·class="p">,</span></code></pre><p>the·value·is·not·assigned·to·a·variable,·not·passed·to·another·function,·and·not
160 returned.·This·means·that·there·is·no·need·to·construct·a·list·and·the·compiler160 returned.·This·means·that·there·is·no·need·to·construct·a·list·and·the·compiler
161 will·simplify·the·code·for·the·list·comprehension·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="9897232411-1">(</span><span·class="p"·data-group-id="9897232411-2">[</span><span·class="n">E</span><span·class="p">|</span><span·class="n">Tail</span><span·class="p"·data-group-id="9897232411-2">]</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·63,·SHA:·47edc3c6de67f3885cce1be091ebe5e74beac9beb4e1e6e8f84a5046b4387319·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">161 will·simplify·the·code·for·the·list·comprehension·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="1259527923-1">(</span><span·class="p"·data-group-id="1259527923-2">[</span><span·class="n">E</span><span·class="p">|</span><span·class="n">Tail</span><span·class="p"·data-group-id="1259527923-2">]</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·63,·SHA:·ff9dc9624d4f5b6bc127f00869923a4e10994f7e4936edc27537ac5e40e340d9·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
162 ····</span><span·class="n">Expr</span><span·class="p"·data-group-id="9897232411-3">(</span><span·class="n">E</span><span·class="p"·data-group-id="9897232411-3">)</span><span·class="p">,</span><span·class="w">162 ····</span><span·class="n">Expr</span><span·class="p"·data-group-id="1259527923-3">(</span><span·class="n">E</span><span·class="p"·data-group-id="1259527923-3">)</span><span·class="p">,</span><span·class="w">
163 ····</span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="9897232411-4">(</span><span·class="n">Tail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Expr</span><span·class="p"·data-group-id="9897232411-4">)</span><span·class="p">;</span><span·class="w">163 ····</span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="1259527923-4">(</span><span·class="n">Tail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Expr</span><span·class="p"·data-group-id="1259527923-4">)</span><span·class="p">;</span><span·class="w">
164 </span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="9897232411-5">(</span><span·class="p"·data-group-id="9897232411-6">[</span><span·class="p"·data-group-id="9897232411-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Expr</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·194,·SHA:·fff18c219df61d727e3c71344fe77491247e1e698eb65b087c9912ad5b4a854d·...·]-7">]</span><span·class="p">.</span></code></pre><p>The·compiler·also·understands·that·assigning·to·<code·class="inline">_</code>·means·that·the·value·will164 </span><span·class="nf">&#39;lc^0&#39;</span><span·class="p"·data-group-id="1259527923-5">(</span><span·class="p"·data-group-id="1259527923-6">[</span><span·class="p"·data-group-id="1259527923-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Expr</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·194,·SHA:·4844ac758091d03d71bdb59047f827e92254407de1c5d3113111b91b235aeaf5·...·]-7">]</span><span·class="p">.</span></code></pre><p>The·compiler·also·understands·that·assigning·to·<code·class="inline">_</code>·means·that·the·value·will
165 not·be·used.·Therefore,·the·code·in·the·following·example·will·also·be·optimized:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7006469514-1">[</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="7006469514-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="7006469514-2">)</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·220,·SHA:·e8c745deb623a574be5d060838e255ab685114d9e9ae12129a56a5543239dbc0·...·]-1">]</span><span·class="p">,</span><span·class="w">165 not·be·used.·Therefore,·the·code·in·the·following·example·will·also·be·optimized:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8814266377-1">[</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="8814266377-2">(</span><span·class="n">E</span><span·class="p"·data-group-id="8814266377-2">)</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·220,·SHA:·009fb2ecb86a7a27246d1b5aca9d69c934003a4b262b97fe93bd3547f4af0e0b·...·]-1">]</span><span·class="p">,</span><span·class="w">
166 </span><span·class="ss">ok</span><span·class="p">.</span></code></pre><h2·id="deep-and-flat-lists"·class="section-heading">166 </span><span·class="ss">ok</span><span·class="p">.</span></code></pre><h2·id="deep-and-flat-lists"·class="section-heading">
167 ··<a·href="#deep-and-flat-lists"·class="hover-link">167 ··<a·href="#deep-and-flat-lists"·class="hover-link">
168 ····<i·class="ri-link-m"·aria-hidden="true"></i>168 ····<i·class="ri-link-m"·aria-hidden="true"></i>
169 ··</a>169 ··</a>
170 ··<span·class="text">Deep·and·Flat·Lists</span>170 ··<span·class="text">Deep·and·Flat·Lists</span>
171 </h2>171 </h2>
172 <p><a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#flatten/1"><code·class="inline">lists:flatten/1</code></a>·builds·an·entirely·new·list.·It·is·therefore·expensive,·and172 <p><a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#flatten/1"><code·class="inline">lists:flatten/1</code></a>·builds·an·entirely·new·list.·It·is·therefore·expensive,·and
173 even·<em>more</em>·expensive·than·the·<code·class="inline">++</code>·operator·(which·copies·its·left·argument,173 even·<em>more</em>·expensive·than·the·<code·class="inline">++</code>·operator·(which·copies·its·left·argument,
174 but·not·its·right·argument).</p><p>In·the·following·situations·it·is·unnecessary·to·call·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#flatten/1"><code·class="inline">lists:flatten/1</code></a>:</p><ul><li>When·sending·data·to·a·port.·Ports·understand·deep·lists·so·there·is·no·reason174 but·not·its·right·argument).</p><p>In·the·following·situations·it·is·unnecessary·to·call·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#flatten/1"><code·class="inline">lists:flatten/1</code></a>:</p><ul><li>When·sending·data·to·a·port.·Ports·understand·deep·lists·so·there·is·no·reason
175 to·flatten·the·list·before·sending·it·to·the·port.</li><li>When·calling·BIFs·that·accept·deep·lists,·such·as175 to·flatten·the·list·before·sending·it·to·the·port.</li><li>When·calling·BIFs·that·accept·deep·lists,·such·as
176 <a·href="../../erts-15.2.6/doc/html/erlang.html#list_to_binary/1"><code·class="inline">list_to_binary/1</code></a>·or176 <a·href="../../erts-15.2.6/doc/html/erlang.html#list_to_binary/1"><code·class="inline">list_to_binary/1</code></a>·or
177 <a·href="../../erts-15.2.6/doc/html/erlang.html#iolist_to_binary/1"><code·class="inline">iolist_to_binary/1</code></a>.</li><li>When·you·know·that·your·list·is·only·one·level·deep.·Use·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#append/1"><code·class="inline">lists:append/1</code></a>177 <a·href="../../erts-15.2.6/doc/html/erlang.html#iolist_to_binary/1"><code·class="inline">iolist_to_binary/1</code></a>.</li><li>When·you·know·that·your·list·is·only·one·level·deep.·Use·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#append/1"><code·class="inline">lists:append/1</code></a>
178 instead.</li></ul><p><em>Examples:</em></p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">port_command</span><span·class="p"·data-group-id="3567541174-1">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DeepList</span><span·class="p"·data-group-id="3567541174-1">)</span></code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"[·...·truncated·by·diffoscope;·len:·954,·SHA:·bb5d7602846fe91c5d08f9b12e439e585e43c9571aecc476bb0076c5f88fd1bd·...·]-1">]</span><span·class="p">,</span><span·class="w">178 instead.</li></ul><p><em>Examples:</em></p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">port_command</span><span·class="p"·data-group-id="4240233835-1">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DeepList</span><span·class="p"·data-group-id="4240233835-1">)</span></code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"[·...·truncated·by·diffoscope;·len:·954,·SHA:·fd5c405f66f25d9adfe83f3c7bb958eaf1b27c43c9ff241c7021c07b481eec03·...·]-1">]</span><span·class="p">,</span><span·class="w">
179 </span><span·class="nf">port_command</span><span·class="p"·data-group-id="9146391778-2">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TerminatedStr</span><span·class="p"·data-group-id="9146391778-2">)</span></code></pre><p>Instead:</p><p><strong>DO</strong></p><pre><code·class[·...·truncated·by·diffoscope;·len:·335,·SHA:·5fbec416a8b9ebe754bb05d2ea1a8202ece90711fcdcfce2845959f196f9ed23·...·]0-1">]</span><span·class="p">,</span><span·class="w">179 </span><span·class="nf">port_command</span><span·class="p"·data-group-id="2667244031-2">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TerminatedStr</span><span·class="p"·data-group-id="2667244031-2">)</span></code></pre><p>Instead:</p><p><strong>DO</strong></p><pre><code·class[·...·truncated·by·diffoscope;·len:·335,·SHA:·bdfe89331e29b6b5b9156b96a441beb7a668b132df5fe8f6cc8e16d63cb0ad8a·...·]0-1">]</span><span·class="p">,</span><span·class="w">
180 </span><span·class="nf">port_command</span><span·class="p"·data-group-id="9642832480-2">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TerminatedStr</span><span·class="p"·data-group-id="9642832480-2">)</span></code></pre><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="0420386479-1">(</span><span·class="p"·data-group-id="0420386479-2">[</span><span·class="p"·data-group-id="0420386479-3">[</span><span·class="mi">1</span><span·class="p"·data-group-id="0420386479-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0420386479-4">[</span><span·class="mi">2</span><span·class="p"·data-group-id="0420386479-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0420386479-5">[</span><span·class="mi">3</span><span·class="p"·data-group-id="0420386479-5">]</span><span·class="p"·data-group-id="0420386479-2">]</span><span·class="p"·data-group-id="0420386479-1">)</span><span·class="p">.</span><span·class="w"> 
181 </span><span·class="p"·data-group-id="0420386479-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="0420386479-6">]</span></code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="1569440703-1">(</span><span·class="p"·data-group-id="1569440703-2">[</span><span·class="p"·data-group-id="1569440703-3">[</span><span·class="mi">1</span><span·class="p"·data-group-id="1569440703-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1569440703-4">[</span><span·class="mi">2</span><span·class="p"·data-group-id="1569440703-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1569440703-5">[</span><span·class="mi">3</span><span·class="p"·data-group-id="1569440703-5">]</span><span·class="p"·data-group-id="1569440703-2">]</span><span·class="p"·data-group-id="1569440703-1">)</span><span·class="p">.</span><span·class="w"> 
182 </span><span·class="p"·data-group-id="1569440703-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="1569440703-6">]</span></code></pre><h2·id="recursive-list-func[·...·truncated·by·diffoscope;·len:·29,·SHA:·4a97f155337d912116f87b534666017ee54bb6a09ff913e0b6272dafbe3ba7c0·...·]">180 </span><span·class="nf">port_command</span><span·class="p"·data-group-id="7219958370-2">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TerminatedStr</span><span·class="p"·data-group-id="7219958370-2">)</span></code></pre><p>[·...·truncated·by·diffoscope;·len:·936,·SHA:·3299754a2c6104c82e149677eae798d4192090c3f4a51ddc669100442f0c1789·...·]">
 181 </span><span·class="p"·data-group-id="8320731273-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="8320731273-6">]</span></code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="3059444971-1">(</span><span·class="p"·data-group-id="3059444971-2">[</span><span·class="p"·data-group-id="3059444971-3">[</span><span·class="mi">1</span><span·class="p"·data-group-id="3059444971-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3059444971-4">[</span><span·class="mi">2</span><span·class="p"·data-group-id="3059444971-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3059444971-5">[</span><span·class="mi">3</span><span·class="p"·data-group-id="3059444971-5">]</span><span·class="p"·data-group-id="3059444971-2">]</span><span·class="p"·data-group-id="3059444971-1">)</span><span·class="p">.</span><span·class="w">
 182 </span><span·class="p"·data-group-id="3059444971-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="3059444971-6">]</span></code></pre><h2·id="recursive-list-functions"·class="section-heading">
183 ··<a·href="#recursive-list-functions"·class="hover-link">183 ··<a·href="#recursive-list-functions"·class="hover-link">
184 ····<i·class="ri-link-m"·aria-hidden="true"></i>184 ····<i·class="ri-link-m"·aria-hidden="true"></i>
185 ··</a>185 ··</a>
186 ··<span·class="text">Recursive·List·Functions</span>186 ··<span·class="text">Recursive·List·Functions</span>
187 </h2>187 </h2>
188 <p>There·are·two·basic·ways·to·write·a·function·that·traverses·a·list·and188 <p>There·are·two·basic·ways·to·write·a·function·that·traverses·a·list·and
189 produces·a·new·list.</p><p>The·first·way·is·writing·a·<em>body-recursive</em>·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Add·42·to·each·integer·in·the·list.</span><span·class="w">189 produces·a·new·list.</p><p>The·first·way·is·writing·a·<em>body-recursive</em>·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Add·42·to·each·integer·in·the·list.</span><span·class="w">
190 </span><span·class="nf">add_42_body</span><span·class="p"·data-group-id="3856085024-1">(</span><span·class="p"·data-group-id="3856085024-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="3856085024-2">]</span><span·class="p"·data-group-id="3856085024-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">190 </span><span·class="nf">add_42_body</span><span·class="p"·data-group-id="5564775548-1">(</span><span·class="p"·data-group-id="5564775548-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="5564775548-2">]</span><span·class="p"·data-group-id="5564775548-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
191 ····</span><span·class="p"·data-group-id="3856085024-3">[</span><span·class="n">H</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">add_42_body</span><span[·...·truncated·by·diffoscope;·len:·166,·SHA:·4431743dea38208fd7f524ce2694d83112018a94490b9398ab1763ed4df9bcee·...·]-3">]</span><span·class="p">;</span><span·class="w">191 ····</span><span·class="p"·data-group-id="5564775548-3">[</span><span·class="n">H</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">add_42_body</span><span[·...·truncated·by·diffoscope;·len:·166,·SHA:·d3daea4f307984f273dca501fbc2e0300aa62b4216a0fb40b1ec2027b6b39a53·...·]-3">]</span><span·class="p">;</span><span·class="w">
192 </span><span·class="nf">add_42_body</span><span·class="p"·data-group-id="3856085024-5">(</span><span·class="p"·data-group-id="3856085024-6">[</span><span·class="p"·data-group-id="3856085024-6">]</span><span·class="p"·data-group-id="3856085024-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 </span><span·class="nf">add_42_body</span><span·class="p"·data-group-id="5564775548-5">(</span><span·class="p"·data-group-id="5564775548-6">[</span><span·class="p"·data-group-id="5564775548-6">]</span><span·class="p"·data-group-id="5564775548-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="p"·data-group-id="3856085024-7">[</span><span·class="p"·data-group-id="3856085024-7">]</span><span·class="p">.</span></code></pre><p>The·second·way·is·writing·a·<em>tail-recursive</em>·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Add·42·to·each·integer·in·the·list.</span><span·class="w">193 ····</span><span·class="p"·data-group-id="5564775548-7">[</span><span·class="p"·data-group-id="5564775548-7">]</span><span·class="p">.</span></code></pre><p>The·second·way·is·writing·a·<em>tail-recursive</em>·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Add·42·to·each·integer·in·the·list.</span><span·class="w">
194 </span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="0893121952-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="0893121952-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 </span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="2674133689-1">(</span><span·class="n">List</span><span·class="p"·data-group-id="2674133689-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ····</span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="0893121952-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0893121952-3">[</span><span·class="p"·data-group-id="0893121952-3">]</span><span·class="p"·data-group-id="0893121952-2">)</span><span·class="p">.</span><span·class="w">195 ····</span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="2674133689-2">(</span><span·class="n">List</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2674133689-3">[</span><span·class="p"·data-group-id="2674133689-3">]</span><span·class="p"·data-group-id="2674133689-2">)</span><span·class="p">.</span><span·class="w">
  
196 </span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="0893121952-4">(</span><span·class="p"·data-group-id="0893121952-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="0893121952-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·3deae565b586aa796cd52c7b005b943d6e210f9e0fe9ae8504c22b6f4b6ead63·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">196 </span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="2674133689-4">(</span><span·class="p"·data-group-id="2674133689-5">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="2674133689-5">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·59,·SHA:·f1b29096bded293c9b662ef615abb0ecd15540ca387f4f0aca74170ca3a7f407·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
197 ····</span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="0893121952-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0893121952-7">[</span><span·class="n">H</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·205,·SHA:·1aad139b265fe0a0986b7c4eaba1b5232411b5c74cae4bce04c0c421216769ed·...·]-6">)</span><span·class="p">;</span><span·class="w">197 ····</span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="2674133689-6">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2674133689-7">[</span><span·class="n">H</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·205,·SHA:·fea0cf4cb5d2b9dc79c8c29027bae24a18aabf5e08a11fe85b0f286410a7a242·...·]-6">)</span><span·class="p">;</span><span·class="w">
198 </span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="0893121952-8">(</span><span·class="p"·data-group-id="0893121952-9">[</span><span·class="p"·data-group-id="0893121952-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="0893121952-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 </span><span·class="nf">add_42_tail</span><span·class="p"·data-group-id="2674133689-8">(</span><span·class="p"·data-group-id="2674133689-9">[</span><span·class="p"·data-group-id="2674133689-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="2674133689-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="0893121952-10">(</span><span·class="n">Acc</span><span·class="p"·data-group-id="0893121952-10">)</span><span·class="p">.</span></code></pre><p>In·early·version·of·Erlang·the·tail-recursive·function·would·typically199 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="2674133689-10">(</span><span·class="n">Acc</span><span·class="p"·data-group-id="2674133689-10">)</span><span·class="p">.</span></code></pre><p>In·early·version·of·Erlang·the·tail-recursive·function·would·typically
200 be·more·efficient.·In·modern·versions·of·Erlang,·there·is·usually·not200 be·more·efficient.·In·modern·versions·of·Erlang,·there·is·usually·not
201 much·difference·in·performance·between·a·body-recursive·list·function·and201 much·difference·in·performance·between·a·body-recursive·list·function·and
202 tail-recursive·function·that·reverses·the·list·at·the·end.·Therefore,202 tail-recursive·function·that·reverses·the·list·at·the·end.·Therefore,
203 concentrate·on·writing·beautiful·code·and·forget·about·the·performance203 concentrate·on·writing·beautiful·code·and·forget·about·the·performance
204 of·your·list·functions.·In·the·time-critical·parts·of·your·code,204 of·your·list·functions.·In·the·time-critical·parts·of·your·code,
205 <em>measure</em>·before·rewriting·your·code.</p><p>For·a·thorough·discussion·about·tail·and·body·recursion,·see205 <em>measure</em>·before·rewriting·your·code.</p><p>For·a·thorough·discussion·about·tail·and·body·recursion,·see
206 <a·href="http://ferd.ca/erlang-s-tail-recursion-is-not-a-silver-bullet.html">Erlang's·Tail·Recursion·is·Not·a·Silver·Bullet</a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·section·is·about·list·functions·that·<em>construct</em>·lists.·A·tail-recursive206 <a·href="http://ferd.ca/erlang-s-tail-recursion-is-not-a-silver-bullet.html">Erlang's·Tail·Recursion·is·Not·a·Silver·Bullet</a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·section·is·about·list·functions·that·<em>construct</em>·lists.·A·tail-recursive
207 function·that·does·not·construct·a·list·runs·in·constant·space,·while·the207 function·that·does·not·construct·a·list·runs·in·constant·space,·while·the
208 corresponding·body-recursive·function·uses·stack·space·proportional·to·the208 corresponding·body-recursive·function·uses·stack·space·proportional·to·the
209 length·of·the·list.</p></section><p>For·example,·a·function·that·sums·a·list·of·integers,·is·<em>not</em>·to·be·written·as209 length·of·the·list.</p></section><p>For·example,·a·function·that·sums·a·list·of·integers,·is·<em>not</em>·to·be·written·as
210 follows:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">recursive_sum</span><span·class="p"·data-group-id="4379891855-1">(</span><span·class="p"·data-group-id="4379891855-2">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="4379891855-2">]</span><span·class="p"·data-group-id="4379891855-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">H</span><span·class="o">+</span><span·class="nf">recursive_sum</span><span·class="p"·data-group-id="4379891855-3">(</span><span·class="n">T</span><span·class="p"·data-group-id="4379891855-3">)</span><span·class="p">;</span><span·class="w"> 
211 </span><span·class="nf">recursive_sum</span><span·class="p"·data-group-id="4379891855-4">(</span><span·class="p"·data-group-id="4379891855-5">[</span><span·class="p"·data-group-id="4379891855-5">]</span><span·class="p"·data-group-id="4379891855-4">)</span>[·...·truncated·by·diffoscope;·len:·710,·SHA:·d40505cbde019ad762d7a7b22eb3eb3fafa54a6a5292a0c61fbb2e14029b7506·...·]</span><span·class="w">210 follows:</p><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">recursive_sum</span><span·class="p"·data-group-id="1671534876-1">(</span><span·class="p"·data-group-id="1671534876-2">[</span><span·class="n">H</span[·...·truncated·by·diffoscope;·len:·463,·SHA:·ef9d65bf8ffd8e805cfb6dfeabc1b5329a172a83d17b5dc51822386cc9f24bcd·...·]</span><span·class="w">
 211 </span><span·class="nf">recursive_sum</span><span·class="p"·data-group-id="1671534876-4">(</span><span·class="p"·data-group-id="1671534876-5">[</span><span·class="p"·data-group-id="1671534876-5">]</span><span·class="p"·data-group-id="1671534876-4">)</span><span·class="w">····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span></code></pre><p>Instead:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sum</span><span·class="p"·data-group-id="0918197322-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="0918197322-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">sum</span><span·class="p"·data-group-id="0918197322-2">(</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="0918197322-2">)</span><span·class="p">.</span><span·class="w">
  
212 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0391739906-3">(</span><span·class="p"·data-group-id="0391739906-4">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="0391739906-4">]</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·461,·SHA:·baf5bee8ca1dcc8e2793caf9933513811652a945e2ceecc16cc6ebb26d1f1b99·...·]-5">)</span><span·class="p">;</span><span·class="w">212 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0918197322-3">(</span><span·class="p"·data-group-id="0918197322-4">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="0918197322-4">]</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·461,·SHA:·db988ee9c89095c2d5efcf1b217b96e37a7fafaf4903dd75d20bd041d8b3aaf9·...·]-5">)</span><span·class="p">;</span><span·class="w">
213 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0391739906-6">(</span><span·class="p"·data-group-id="0391739906-7">[</span><span·class="p"·data-group-id="0391739906-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="0391739906-6">)</span><span·class="w">····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p">.</span></code></pre>213 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0918197322-6">(</span><span·class="p"·data-group-id="0918197322-7">[</span><span·class="p"·data-group-id="0918197322-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="0918197322-6">)</span><span·class="w">····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p">.</span></code></pre>
214 </div>214 </div>
  
215 <div·class="bottom-actions"·id="bottom-actions">215 <div·class="bottom-actions"·id="bottom-actions">
216 ··<div·class="bottom-actions-item">216 ··<div·class="bottom-actions-item">
  
217 ······<a·href="maps.html"·class="bottom-actions-button"·rel="prev">217 ······<a·href="maps.html"·class="bottom-actions-button"·rel="prev">
218 ········<span·class="subheader">218 ········<span·class="subheader">
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261 ······<p·class="built-using">261 ······<p·class="built-using">
262 ········Built·using262 ········Built·using
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264 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>264 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
265 ······</p>265 ······</p>
266 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>266 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
267 ····</footer>267 ····</footer>
268 ··</div>268 ··</div>
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117 <h2·id="file-inclusion"·class="section-heading">117 <h2·id="file-inclusion"·class="section-heading">
118 ··<a·href="#file-inclusion"·class="hover-link">118 ··<a·href="#file-inclusion"·class="hover-link">
119 ····<i·class="ri-link-m"·aria-hidden="true"></i>119 ····<i·class="ri-link-m"·aria-hidden="true"></i>
120 ··</a>120 ··</a>
121 ··<span·class="text">File·Inclusion</span>121 ··<span·class="text">File·Inclusion</span>
122 </h2>122 </h2>
123 <p>A·file·can·be·included·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="9409250056-1">(</span><span·class="n">File</span><span·class="p"·data-group-id="9409250056-1">)</span><span·class="p">.</span><span·class="w">123 <p>A·file·can·be·included·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="5793530515-1">(</span><span·class="n">File</span><span·class="p"·data-group-id="5793530515-1">)</span><span·class="p">.</span><span·class="w">
124 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9409250056-2">(</span><span·class="n">File</span><span·class="p"·data-group-id="9409250056-2">)</span><span·class="p">.</span></code></pre><p><code·class="inline">File</code>,·a·string,·is·to·point·out·a·file.·The·contents·of·this·file·are·included124 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="5793530515-2">(</span><span·class="n">File</span><span·class="p"·data-group-id="5793530515-2">)</span><span·class="p">.</span></code></pre><p><code·class="inline">File</code>,·a·string,·is·to·point·out·a·file.·The·contents·of·this·file·are·included
125 as·is,·at·the·position·of·the·directive.</p><p>Include·files·are·typically·used·for·record·and·macro·definitions·that·are125 as·is,·at·the·position·of·the·directive.</p><p>Include·files·are·typically·used·for·record·and·macro·definitions·that·are
126 shared·by·several·modules.·It·is·recommended·to·use·the·file·name·extension126 shared·by·several·modules.·It·is·recommended·to·use·the·file·name·extension
127 <code·class="inline">.hrl</code>·for·include·files.</p><p><code·class="inline">File</code>·can·start·with·a·path·component·<code·class="inline">$VAR</code>,·for·some·string·<code·class="inline">VAR</code>.·If·that·is127 <code·class="inline">.hrl</code>·for·include·files.</p><p><code·class="inline">File</code>·can·start·with·a·path·component·<code·class="inline">$VAR</code>,·for·some·string·<code·class="inline">VAR</code>.·If·that·is
128 the·case,·the·value·of·the·environment·variable·<code·class="inline">VAR</code>·as·returned·by128 the·case,·the·value·of·the·environment·variable·<code·class="inline">VAR</code>·as·returned·by
129 <code·class="inline">os:getenv(VAR)</code>·is·substituted·for·<code·class="inline">$VAR</code>.·If·<code·class="inline">os:getenv(VAR)</code>·returns·<code·class="inline">false</code>,129 <code·class="inline">os:getenv(VAR)</code>·is·substituted·for·<code·class="inline">$VAR</code>.·If·<code·class="inline">os:getenv(VAR)</code>·returns·<code·class="inline">false</code>,
130 <code·class="inline">$VAR</code>·is·left·as·is.</p><p>If·the·filename·<code·class="inline">File</code>·is·absolute·(possibly·after·variable·substitution),·the130 <code·class="inline">$VAR</code>·is·left·as·is.</p><p>If·the·filename·<code·class="inline">File</code>·is·absolute·(possibly·after·variable·substitution),·the
131 include·file·with·that·name·is·included.·Otherwise,·the·specified·file·is131 include·file·with·that·name·is·included.·Otherwise,·the·specified·file·is
132 searched·for·in·the·following·directories,·and·in·this·order:</p><ol><li>The·current·working·directory</li><li>The·directory·where·the·module·is·being·compiled</li><li>The·directories·given·by·the·<code·class="inline">include</code>·option</li></ol><p>For·details,·see·<a·href="../../erts-15.2.6/doc/html/erlc_cmd.html">erlc</a>·in·ERTS·and132 searched·for·in·the·following·directories,·and·in·this·order:</p><ol><li>The·current·working·directory</li><li>The·directory·where·the·module·is·being·compiled</li><li>The·directories·given·by·the·<code·class="inline">include</code>·option</li></ol><p>For·details,·see·<a·href="../../erts-15.2.6/doc/html/erlc_cmd.html">erlc</a>·in·ERTS·and
133 <a·href="../../lib/compiler-8.6.1/doc/html/compile.html"><code·class="inline">compile</code></a>·in·Compiler.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="0622171084-1">(</span><span·class="s">&quot;my_records.hrl&quot;</span><span·class="p"·data-group-id="0622171084-1">)</span><span·class="p">.</span><span·class="w">133 <a·href="../../lib/compiler-8.6.1/doc/html/compile.html"><code·class="inline">compile</code></a>·in·Compiler.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="1015554869-1">(</span><span·class="s">&quot;my_records.hrl&quot;</span><span·class="p"·data-group-id="1015554869-1">)</span><span·class="p">.</span><span·class="w">
134 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="0622171084-2">(</span><span·class="s">&quot;incdir/my_records.hrl&quot;</span><span·class="p"·data-group-id="0622171084-2">)</span><span·class="p">.</span><span·class="w">134 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="1015554869-2">(</span><span·class="s">&quot;incdir/my_records.hrl&quot;</span><span·class="p"·data-group-id="1015554869-2">)</span><span·class="p">.</span><span·class="w">
135 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="0622171084-3">(</span><span·class="s">&quot;/home/user/proj/my_records.hrl&quot;</span><span·class="p"·data-group-id="0622171084-3">)</span><span·class="p">.</span><span·class="w">135 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="1015554869-3">(</span><span·class="s">&quot;/home/user/proj/my_records.hrl&quot;</span><span·class="p"·data-group-id="1015554869-3">)</span><span·class="p">.</span><span·class="w">
136 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="0622171084-4">(</span><span·class="s">&quot;$PROJ_ROOT/my_records.hrl&quot;</span><span·class="p"·data-group-id="0622171084-4">)</span><span·class="p">.</span></code></pre><p><code·class="inline">include_lib</code>·is·similar·to·<code·class="inline">include</code>,·but·is·not·to·point·out·an·absolute·file.136 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="1015554869-4">(</span><span·class="s">&quot;$PROJ_ROOT/my_records.hrl&quot;</span><span·class="p"·data-group-id="1015554869-4">)</span><span·class="p">.</span></code></pre><p><code·class="inline">include_lib</code>·is·similar·to·<code·class="inline">include</code>,·but·is·not·to·point·out·an·absolute·file.
137 Instead,·the·first·path·component·(possibly·after·variable·substitution)·is137 Instead,·the·first·path·component·(possibly·after·variable·substitution)·is
138 assumed·to·be·the·name·of·an·application.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8501542035-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="8501542035-1">)</span><span·class="p">.</span></code></pre><p>The·code·server·uses·<code·class="inline">code:lib_dir(kernel)</code>·to·find·the·directory·of·the·current138 assumed·to·be·the·name·of·an·application.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3870701607-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="3870701607-1">)</span><span·class="p">.</span></code></pre><p>The·code·server·uses·<code·class="inline">code:lib_dir(kernel)</code>·to·find·the·directory·of·the·current
139 (latest)·version·of·Kernel,·and·then·the·subdirectory·<code·class="inline">include</code>·is·searched·for139 (latest)·version·of·Kernel,·and·then·the·subdirectory·<code·class="inline">include</code>·is·searched·for
140 the·file·<code·class="inline">file.hrl</code>.</p><h2·id="defining-and-using-macros"·class="section-heading">140 the·file·<code·class="inline">file.hrl</code>.</p><h2·id="defining-and-using-macros"·class="section-heading">
141 ··<a·href="#defining-and-using-macros"·class="hover-link">141 ··<a·href="#defining-and-using-macros"·class="hover-link">
142 ····<i·class="ri-link-m"·aria-hidden="true"></i>142 ····<i·class="ri-link-m"·aria-hidden="true"></i>
143 ··</a>143 ··</a>
144 ··<span·class="text">Defining·and·Using·Macros</span>144 ··<span·class="text">Defining·and·Using·Macros</span>
145 </h2>145 </h2>
146 <p>A·macro·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="0853226014-1">(</span><span·class="n">Const</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Replacement</span><span·class="p"·data-group-id="0853226014-1">)</span><span·class="p">.</span><span·class="w"> 
147 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="0853226014-2">(</span><span·class="n">Func</span><span·class="p"·data-group-id="0853226014-3">(</span><span·class="n">Var1</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·414,·SHA:·7ebb33545ec5d3eb6b75c6c886e32cafef99df1b25b67a17b660f7c1ce97c571·...·]146 <p>A·macro·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5042228831-1">(</span><span·class="n">Const</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·138,·SHA:·608f55c76b4a50428349832938ceada53de942281906bb23c001fe4a493de69f·...·]
 147 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5042228831-2">(</span><span·class="n">Func</span><span·class="p"·data-group-id="5042228831-3">(</span><span·class="n">Var1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">VarN</span><span·class="p"·data-group-id="5042228831-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Replacement</span><span·class="p"·data-group-id="5042228831-2">)</span><span·class="p">.</span></code></pre><p>A·macro·definition·can·be·placed·anywhere·among·the·attributes·and·function
148 declarations·of·a·module,·but·the·definition·must·come·before·any·usage·of·the148 declarations·of·a·module,·but·the·definition·must·come·before·any·usage·of·the
149 macro.</p><p>If·a·macro·is·used·in·several·modules,·it·is·recommended·that·the·macro149 macro.</p><p>If·a·macro·is·used·in·several·modules,·it·is·recommended·that·the·macro
150 definition·is·placed·in·an·include·file.</p><p>A·macro·is·used·as·follows:</p><pre><code·class="text">?Const150 definition·is·placed·in·an·include·file.</p><p>A·macro·is·used·as·follows:</p><pre><code·class="text">?Const
151 ?Func(Arg1,...,ArgN)</code></pre><p>Macros·are·expanded·during·compilation.·A·simple·macro·<code·class="inline">?Const</code>·is·replaced·with151 ?Func(Arg1,...,ArgN)</code></pre><p>Macros·are·expanded·during·compilation.·A·simple·macro·<code·class="inline">?Const</code>·is·replaced·with
152 <code·class="inline">Replacement</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="6721178615-1">(</span><span·class="n">TIMEOUT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p"·data-group-id="6721178615-1">)</span><span·class="p">.</span><span·class="w">152 <code·class="inline">Replacement</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5420173341-1">(</span><span·class="n">TIMEOUT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p"·data-group-id="5420173341-1">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">153 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
154 </span><span·class="nf">call</span><span·class="p"·data-group-id="6721178615-2">(</span><span·class="n">Request</span><span·class="p"·data-group-id="6721178615-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">154 </span><span·class="nf">call</span><span·class="p"·data-group-id="5420173341-2">(</span><span·class="n">Request</span><span·class="p"·data-group-id="5420173341-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
155 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="6721178615-3">(</span><span·class="ss">refserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">TIMEOUT</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·296,·SHA:·ab7ed839d5414e0b7ec4e53f2a0d921d73b67c6fffdad690931c771ee964818f·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">155 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="5420173341-3">(</span><span·class="ss">refserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">TIMEOUT</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·296,·SHA:·d4794788b8b19d1c5dab15104bef69acc37fb0c4984794febeca33b445cd0e5b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
156 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3801917314-2">(</span><span·class="ss">refserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p"·data-group-id="3801917314-2">)</span><span·class="p">.</span></code></pre><p>A·macro·<code·class="inline">?Func(Arg1,...,ArgN)</code>·is·replaced·with·<code·class="inline">Replacement</code>,·where·all156 ····</span><span·class="nc">server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3577830427-2">(</span><span·class="ss">refserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p"·data-group-id="3577830427-2">)</span><span·class="p">.</span></code></pre><p>A·macro·<code·class="inline">?Func(Arg1,...,ArgN)</code>·is·replaced·with·<code·class="inline">Replacement</code>,·where·all
157 occurrences·of·a·variable·<code·class="inline">Var</code>·from·the·macro·definition·are·replaced·with·the157 occurrences·of·a·variable·<code·class="inline">Var</code>·from·the·macro·definition·are·replaced·with·the
158 corresponding·argument·<code·class="inline">Arg</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7932174202-1">(</span><span·class="n">MACRO1</span><span·class="p"·data-group-id="7932174202-2">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="7932174202-2">)</span><sp[·...·truncated·by·diffoscope;·len:·434,·SHA:·815ea01f1cfbb5e9715df2f759c31f4e5ca1de01de6241e8b4391968aa742a9d·...·]-1">)</span><span·class="p">.</span><span·class="w">158 corresponding·argument·<code·class="inline">Arg</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="6879445350-1">(</span><span·class="n">MACRO1</span><span·class="p"·data-group-id="6879445350-2">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6879445350-2">)</span><sp[·...·truncated·by·diffoscope;·len:·434,·SHA:·da10148d7dce5bb7836f6a0ba78b5d338dfd8352674dcfae9dfb686bf7698255·...·]-1">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">159 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
160 </span><span·class="nf">bar</span><span·class="p"·data-group-id="7932174202-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="7932174202-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">160 </span><span·class="nf">bar</span><span·class="p"·data-group-id="6879445350-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="6879445350-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
161 ····</span><span·class="o">?</span><span·class="n">MACRO1</span><span·class="p"·data-group-id="7932174202-5">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="7932174202-5">)</span><span·class="p">,</span><span·class="w">161 ····</span><span·class="o">?</span><span·class="n">MACRO1</span><span·class="p"·data-group-id="6879445350-5">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="6879445350-5">)</span><span·class="p">,</span><span·class="w">
162 ····</span><span·class="o">?</span><span·class="n">MACRO1</span><span·class="p"·data-group-id="7932174202-6">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">123</span><span·class="p"·data-group-id="7932174202-6">)</span></code></pre><p>This·is·expanded·to:</p><pre><code·class="makeup·erlang"·translate[·...·truncated·by·diffoscope;·len:·150,·SHA:·12fbb6065dbc419f72e0ea6a0aac2631b83e7fc91162048f49ffab7d1a9e73bf·...·]3-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">162 ····</span><span·class="o">?</span><span·class="n">MACRO1</span><span·class="p"·data-group-id="6879445350-6">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">123</span><span·class="p"·data-group-id="6879445350-6">)</span></code></pre><p>This·is·expanded·to:</p><pre><code·class="makeup·erlang"·translate[·...·truncated·by·diffoscope;·len:·150,·SHA:·8054d7de3e5df67144daa74f401b4c0704136fbc225693997d1bb2f2c1009b5f·...·]3-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
163 ····</span><span·class="p"·data-group-id="3381076903-2">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="3381076903-2">}</span><span·class="p">,</span><span·class="w">163 ····</span><span·class="p"·data-group-id="2288124633-2">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="2288124633-2">}</span><span·class="p">,</span><span·class="w">
164 ····</span><span·class="p"·data-group-id="3381076903-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="n">X</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">123</span><span·class="p"·data-group-id="3381076903-3">}</span><span·class="p">.</span></code></pre><p>It·is·good·programming·practice,·but·not·mandatory,·to·ensure·that·a·macro164 ····</span><span·class="p"·data-group-id="2288124633-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="n">X</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">123</span><span·class="p"·data-group-id="2288124633-3">}</span><span·class="p">.</span></code></pre><p>It·is·good·programming·practice,·but·not·mandatory,·to·ensure·that·a·macro
165 definition·is·a·valid·Erlang·syntactic·form.</p><p>To·view·the·result·of·macro·expansion,·a·module·can·be·compiled·with·the·<code·class="inline">'P'</code>165 definition·is·a·valid·Erlang·syntactic·form.</p><p>To·view·the·result·of·macro·expansion,·a·module·can·be·compiled·with·the·<code·class="inline">'P'</code>
166 option.·<code·class="inline">compile:file(File,·['P'])</code>.·This·produces·a·listing·of·the·parsed·code166 option.·<code·class="inline">compile:file(File,·['P'])</code>.·This·produces·a·listing·of·the·parsed·code
167 after·preprocessing·and·parse·transforms,·in·the·file·<code·class="inline">File.P</code>.</p><h2·id="predefined-macros"·class="section-heading">167 after·preprocessing·and·parse·transforms,·in·the·file·<code·class="inline">File.P</code>.</p><h2·id="predefined-macros"·class="section-heading">
168 ··<a·href="#predefined-macros"·class="hover-link">168 ··<a·href="#predefined-macros"·class="hover-link">
169 ····<i·class="ri-link-m"·aria-hidden="true"></i>169 ····<i·class="ri-link-m"·aria-hidden="true"></i>
170 ··</a>170 ··</a>
171 ··<span·class="text">Predefined·Macros</span>171 ··<span·class="text">Predefined·Macros</span>
Offset 185, 29 lines modifiedOffset 185, 29 lines modified
185 ····<i·class="ri-link-m"·aria-hidden="true"></i>185 ····<i·class="ri-link-m"·aria-hidden="true"></i>
186 ··</a>186 ··</a>
187 ··<span·class="text">Macros·Overloading</span>187 ··<span·class="text">Macros·Overloading</span>
188 </h2>188 </h2>
189 <p>It·is·possible·to·overload·macros,·except·for·predefined·macros.·An·overloaded189 <p>It·is·possible·to·overload·macros,·except·for·predefined·macros.·An·overloaded
190 macro·has·more·than·one·definition,·each·with·a·different·number·of·arguments.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Support·for·overloading·of·macros·was·added·in·Erlang·5.7.5/OTP·R13B04.</p></section><p>A·macro·<code·class="inline">?Func(Arg1,...,ArgN)</code>·with·a·(possibly·empty)·list·of·arguments·results190 macro·has·more·than·one·definition,·each·with·a·different·number·of·arguments.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Support·for·overloading·of·macros·was·added·in·Erlang·5.7.5/OTP·R13B04.</p></section><p>A·macro·<code·class="inline">?Func(Arg1,...,ArgN)</code>·with·a·(possibly·empty)·list·of·arguments·results
191 in·an·error·message·if·there·is·at·least·one·definition·of·<code·class="inline">Func</code>·with191 in·an·error·message·if·there·is·at·least·one·definition·of·<code·class="inline">Func</code>·with
192 arguments,·but·none·with·N·arguments.</p><p>Assuming·these·definitions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7597355924-1">(</span><span·class="n">F0</span><span·class="p"·data-group-id="7597355924-2">(</span><span·class="p"·data-group-id="7597355924-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·c093deeb80227a282fc3aeffb97cb3dd83b2340ac63c3941928d37138b72c44c·...·]-1">)</span><span·class="p">.</span><span·class="w">192 arguments,·but·none·with·N·arguments.</p><p>Assuming·these·definitions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="1043811723-1">(</span><span·class="n">F0</span><span·class="p"·data-group-id="1043811723-2">(</span><span·class="p"·data-group-id="1043811723-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·336a42ba15970248d5f240c70fcd0ec5787a7798e3f69f7da23c69b92e2e4cad·...·]-1">)</span><span·class="p">.</span><span·class="w">
193 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7597355924-3">(</span><span·class="n">F1</span><span·class="p"·data-group-id="7597355924-4">(</span><span·class="n">A</span><span·class="p"·data-group-id="7597355924-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·e58c74ee68dfc790fb8973911b8916e6fd4ee70d95aba288b4dbb32b083b5d3b·...·]-3">)</span><span·class="p">.</span><span·class="w">193 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="1043811723-3">(</span><span·class="n">F1</span><span·class="p"·data-group-id="1043811723-4">(</span><span·class="n">A</span><span·class="p"·data-group-id="1043811723-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·15ced0a2eb1a3e07d677381c5d2659a6625ed768d71a31053bc0e7f4e3f486ae·...·]-3">)</span><span·class="p">.</span><span·class="w">
194 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7597355924-5">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">m</span><span·class="p">:</span><span·class="ss">f</span><span·class="p"·data-group-id="7597355924-5">)</span><span·class="p">.</span></code></pr[·...·truncated·by·diffoscope;·len:·205,·SHA:·255cec9ff94cb8fdb23600e24defa6851640bcda17090c353310156ee7460557·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="1043811723-5">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">m</span><span·class="p">:</span><span·class="ss">f</span><span·class="p"·data-group-id="1043811723-5">)</span><span·class="p">.</span></code></pr[·...·truncated·by·diffoscope;·len:·205,·SHA:·20baebb803b7c9294de2d2b6e1f06177726191169c1ce55b7abd97d8d547ed2f·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ····</span><span·class="o">?</span><span·class="n">F0</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·No,·an·empty·list·of·arguments·expected.</span><span·class="w">195 ····</span><span·class="o">?</span><span·class="n">F0</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·No,·an·empty·list·of·arguments·expected.</span><span·class="w">
  
196 </span><span·class="nf">f1</span><span·class="p"·data-group-id="2875420370-2">(</span><span·class="n">A</span><span·class="p"·data-group-id="2875420370-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">196 </span><span·class="nf">f1</span><span·class="p"·data-group-id="8871933977-2">(</span><span·class="n">A</span><span·class="p"·data-group-id="8871933977-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
197 ····</span><span·class="o">?</span><span·class="n">F1</span><span·class="p"·data-group-id="2875420370-3">(</span><span·class="n">A</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="2875420370-3">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·No,·exactly·one·argument·expected.</span></code></pre><p>On·the·other·hand,</p><pre><code·class="text">f()·-&gt;197 ····</span><span·class="o">?</span><span·class="n">F1</span><span·class="p"·data-group-id="8871933977-3">(</span><span·class="n">A</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="8871933977-3">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·No,·exactly·one·argument·expected.</span></code></pre><p>On·the·other·hand,</p><pre><code·class="text">f()·-&gt;
198 ····?C().</code></pre><p>is·expanded·to</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="2377830899-1">(</span><span·class="p"·data-group-id="2377830899-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 ····?C().</code></pre><p>is·expanded·to</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="8291434338-1">(</span><span·class="p"·data-group-id="8291434338-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ····</span><span·class="nc">m</span><span·class="p">:</span><span·class="nf">f</span><span·class="p"·data-group-id="2377830899-2">(</span><span·class="p"·data-group-id="2377830899-2">)</span><span·class="p">.</span></code></pre><h2·id="removing-a-macro-definition"·class="section-heading">199 ····</span><span·class="nc">m</span><span·class="p">:</span><span·class="nf">f</span><span·class="p"·data-group-id="8291434338-2">(</span><span·class="p"·data-group-id="8291434338-2">)</span><span·class="p">.</span></code></pre><h2·id="removing-a-macro-definition"·class="section-heading">
200 ··<a·href="#removing-a-macro-definition"·class="hover-link">200 ··<a·href="#removing-a-macro-definition"·class="hover-link">
201 ····<i·class="ri-link-m"·aria-hidden="true"></i>201 ····<i·class="ri-link-m"·aria-hidden="true"></i>
202 ··</a>202 ··</a>
203 ··<span·class="text">Removing·a·macro·definition</span>203 ··<span·class="text">Removing·a·macro·definition</span>
204 </h2>204 </h2>
205 <p>A·definition·of·macro·can·be·removed·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">undef</span><span·class="p"·data-group-id="0205007623-1">(</span><span·class="n">Macro</span><span·class="p"·data-group-id="0205007623-1">)</span><span·class="p">.</span></code></pre><h2·id="conditional-compilation"·class="section-heading">205 <p>A·definition·of·macro·can·be·removed·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">undef</span><span·class="p"·data-group-id="3107114943-1">(</span><span·class="n">Macro</span><span·class="p"·data-group-id="3107114943-1">)</span><span·class="p">.</span></code></pre><h2·id="conditional-compilation"·class="section-heading">
206 ··<a·href="#conditional-compilation"·class="hover-link">206 ··<a·href="#conditional-compilation"·class="hover-link">
207 ····<i·class="ri-link-m"·aria-hidden="true"></i>207 ····<i·class="ri-link-m"·aria-hidden="true"></i>
208 ··</a>208 ··</a>
209 ··<span·class="text">Conditional·Compilation</span>209 ··<span·class="text">Conditional·Compilation</span>
210 </h2>210 </h2>
211 <p>The·following·macro·directives·support·conditional·compilation:</p><ul><li><p><strong><code·class="inline">-ifdef(Macro).</code></strong>·-·Evaluate·the·following·lines·only·if·<code·class="inline">Macro</code>·is211 <p>The·following·macro·directives·support·conditional·compilation:</p><ul><li><p><strong><code·class="inline">-ifdef(Macro).</code></strong>·-·Evaluate·the·following·lines·only·if·<code·class="inline">Macro</code>·is
212 defined.</p></li><li><p><strong><code·class="inline">-ifndef(Macro).</code></strong>·-·Evaluate·the·following·lines·only·if·<code·class="inline">Macro</code>·is·not212 defined.</p></li><li><p><strong><code·class="inline">-ifndef(Macro).</code></strong>·-·Evaluate·the·following·lines·only·if·<code·class="inline">Macro</code>·is·not
Offset 219, 43 lines modifiedOffset 219, 43 lines modified
219 true,·and·the·<code·class="inline">Condition</code>·evaluates·to·true,·the·lines·following·the·<code·class="inline">elif</code>219 true,·and·the·<code·class="inline">Condition</code>·evaluates·to·true,·the·lines·following·the·<code·class="inline">elif</code>
220 are·evaluated·instead.</p></li><li><p><strong><code·class="inline">-endif.</code></strong>·-·Specifies·the·end·of·a·series·of·control·flow·directives.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Macro·directives·cannot·be·used·inside·functions.</p></section><p>Syntactically,·the·<code·class="inline">Condition</code>·in·<code·class="inline">if</code>·and·<code·class="inline">elif</code>·must·be·a220 are·evaluated·instead.</p></li><li><p><strong><code·class="inline">-endif.</code></strong>·-·Specifies·the·end·of·a·series·of·control·flow·directives.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Macro·directives·cannot·be·used·inside·functions.</p></section><p>Syntactically,·the·<code·class="inline">Condition</code>·in·<code·class="inline">if</code>·and·<code·class="inline">elif</code>·must·be·a
221 <a·href="expressions.html#guard-expressions">guard·expression</a>.·Other·constructs·(such·as221 <a·href="expressions.html#guard-expressions">guard·expression</a>.·Other·constructs·(such·as
222 a·<code·class="inline">case</code>·expression)·result·in·a·compilation·error.</p><p>As·opposed·to·the·standard·guard·expressions,·an·expression·in·an·<code·class="inline">if</code>·and222 a·<code·class="inline">case</code>·expression)·result·in·a·compilation·error.</p><p>As·opposed·to·the·standard·guard·expressions,·an·expression·in·an·<code·class="inline">if</code>·and
223 <code·class="inline">elif</code>·also·supports·calling·the·psuedo-function·<code·class="inline">defined(Name)</code>,·which·tests223 <code·class="inline">elif</code>·also·supports·calling·the·psuedo-function·<code·class="inline">defined(Name)</code>,·which·tests
224 whether·the·<code·class="inline">Name</code>·argument·is·the·name·of·a·previously·defined·macro.224 whether·the·<code·class="inline">Name</code>·argument·is·the·name·of·a·previously·defined·macro.
225 <code·class="inline">defined(Name)</code>·evaluates·to·<code·class="inline">true</code>·if·the·macro·is·defined·and·<code·class="inline">false</code>225 <code·class="inline">defined(Name)</code>·evaluates·to·<code·class="inline">true</code>·if·the·macro·is·defined·and·<code·class="inline">false</code>
226 otherwise.·An·attempt·to·call·other·functions·results·in·a·compilation·error.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7896845883-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="7896845883-1">)</span><span·class="p">.</span><span·class="w">226 otherwise.·An·attempt·to·call·other·functions·results·in·a·compilation·error.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2664725347-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="2664725347-1">)</span><span·class="p">.</span><span·class="w">
227 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">227 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
228 </span><span·class="w">228 </span><span·class="w">
229 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="7896845883-2">(</span><span·class="ss">debug</span><span·class="p"·data-group-id="7896845883-2">)</span><span·class="p">.</span><span·class="w">229 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="2664725347-2">(</span><span·class="ss">debug</span><span·class="p"·data-group-id="2664725347-2">)</span><span·class="p">.</span><span·class="w">
230 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7896845883-3">(</span><span·class="n">LOG</span><span·class="p"·data-group-id="7896845883-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="7896845883-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">io</span><spa[·...·truncated·by·diffoscope;·len:·740,·SHA:·715a7719f88e3545098a5ac1d054e679dc208239975a79c70bcca195210435d7·...·]-3">)</span><span·class="p">.</span><span·class="w">230 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2664725347-3">(</span><span·class="n">LOG</span><span·class="p"·data-group-id="2664725347-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="2664725347-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">io</span><spa[·...·truncated·by·diffoscope;·len:·740,·SHA:·fcc9b50be20af9c55345f8b19b005862c4bdc068b2343f772c59e427fc4aa982·...·]-3">)</span><span·class="p">.</span><span·class="w">
231 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">231 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
232 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7896845883-7">(</span><span·class="n">LOG</span><span·class="p"·data-group-id="7896845883-8">(</span><span·class="n">X</span><span·class="p"·data-group-id="7896845883-8">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·1fdd07f314b30dfaf810e1a5469b4083aad25521176c487cabdffdd0f1ad489c·...·]-7">)</span><span·class="p">.</span><span·class="w">232 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2664725347-7">(</span><span·class="n">LOG</span><span·class="p"·data-group-id="2664725347-8">(</span><span·class="n">X</span><span·class="p"·data-group-id="2664725347-8">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·aa39ea6bec28b9b531326f8630972a6de3dbef4369f2cbae43f8b457815a1f5e·...·]-7">)</span><span·class="p">.</span><span·class="w">
233 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">233 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
  
234 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>When·trace·output·is·desired,·<code·class="inline">debug</code>·is·to·be·defined·when·the·module·<code·class="inline">m</code>·is234 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>When·trace·output·is·desired,·<code·class="inline">debug</code>·is·to·be·defined·when·the·module·<code·class="inline">m</code>·is
235 compiled:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erlc·-Ddebug·m.erl</span><span·class="w">235 compiled:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erlc·-Ddebug·m.erl</span><span·class="w">
  
236 </span><span·class="ow">or</span><span·class="w">236 </span><span·class="ow">or</span><span·class="w">
  
237 </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">c</span><span·class="p"·data-group-id="9267723582-1">(</span><span·class="ss">m</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9267723582-2">{</span><span·class="ss">d</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug</span><span·[·...·truncated·by·diffoscope;·len:·88,·SHA:·0fd96808462d0905611930233fc5c9ef4eb03ac7cfb7f1e97d51a33518973a49·...·]-1">)</span><span·class="p">.</span><span·class="w">237 </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">c</span><span·class="p"·data-group-id="4110085150-1">(</span><span·class="ss">m</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4110085150-2">{</span><span·class="ss">d</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug</span><span·[·...·truncated·by·diffoscope;·len:·88,·SHA:·ff11504ed58643e947d10e694176a11418806d347dc3add9f7d50456ca7151d3·...·]-1">)</span><span·class="p">.</span><span·class="w">
238 </span><span·class="p"·data-group-id="9267723582-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">m</span><span·class="p"·data-group-id="9267723582-3">}</span></code></pre><p><code·class="inline">?LOG(Arg)</code>·is·then·expanded·to·a·call·to·<a·href="../../lib/stdlib-6.2.2/doc/html/io.html#format/2"><code·class="inline">io:format/2</code></a>·and·provide·the·user 
239 with·some·simple·trace·output.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8850862678-1">(</span><span·class="ss">m</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·51,·SHA:·4f6c5aa68c6b3aec7244b56bd31b1a7ce83329e74e8f75e28109f9555bfc9869·...·]238 </span><span·class="p"·data-group-id="4110085150-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">m</span><span·class="p"·data-group-id="4110085150-3">}</span></code></pre><p><code·class="inline">?LOG(Arg)</code>·is·then·expand[·...·truncated·by·diffoscope;·len:·139,·SHA:·ccde24393d2291c3df2989f7e1a83c4178d0237fc21fc7999575bf9375a21423·...·]
 239 with·some·simple·trace·output.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2161021846-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="2161021846-1">)</span><span·class="w">
240 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">240 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
241 </span><span·class="p">-</span><span·class="na">if</span><span·class="p"·data-group-id="8850862678-2">(</span><span·class="o">?</span><span·class="n">OTP_RELEASE</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">25</span><span·class="p"·data-group-id="8850862678-2">)</span><span·class="p">.</span><span·class="w">241 </span><span·class="p">-</span><span·class="na">if</span><span·class="p"·data-group-id="2161021846-2">(</span><span·class="o">?</span><span·class="n">OTP_RELEASE</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">25</span><span·class="p"·data-group-id="2161021846-2">)</span><span·class="p">.</span><span·class="w">
242 </span><span·class="c1">%%·Code·that·will·work·in·OTP·25·or·higher</span><span·class="w">242 </span><span·class="c1">%%·Code·that·will·work·in·OTP·25·or·higher</span><span·class="w">
243 </span><span·class="p">-</span><span·class="na">elif</span><span·class="p"·data-group-id="8850862678-3">(</span><span·class="o">?</span><span·class="n">OTP_RELEASE</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">26</span><span·class="p"·data-group-id="8850862678-3">)</span><span·class="p">.</span><span·class="w">243 </span><span·class="p">-</span><span·class="na">elif</span><span·class="p"·data-group-id="2161021846-3">(</span><span·class="o">?</span><span·class="n">OTP_RELEASE</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">26</span><span·class="p"·data-group-id="2161021846-3">)</span><span·class="p">.</span><span·class="w">
244 </span><span·class="c1">%%·Code·that·will·work·in·OTP·26·or·higher</span><span·class="w">244 </span><span·class="c1">%%·Code·that·will·work·in·OTP·26·or·higher</span><span·class="w">
245 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">245 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
246 </span><span·class="c1">%%·Code·that·will·work·in·OTP·24·or·lower.</span><span·class="w">246 </span><span·class="c1">%%·Code·that·will·work·in·OTP·24·or·lower.</span><span·class="w">
247 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">247 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
248 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>This·code·uses·the·<code·class="inline">OTP_RELEASE</code>·macro·to·conditionally·select·code·depending·on248 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>This·code·uses·the·<code·class="inline">OTP_RELEASE</code>·macro·to·conditionally·select·code·depending·on
249 release.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5846173674-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="5846173674-1">)</span><span·class="w">249 release.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2345654672-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="2345654672-1">)</span><span·class="w">
250 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">250 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
251 </span><span·class="p">-</span><span·class="na">if</span><span·class="p"·data-group-id="5846173674-2">(</span><span·class="o">?</span><span·class="n">OTP_RELEASE</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="ow">andalso</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·212,·SHA:·a7e83b1690f3b2296ddcbdb91e5f5a482513f0ebd9f69c1d9e3892a5ab63812d·...·]-2">)</span><span·class="p">.</span><span·class="w">251 </span><span·class="p">-</span><span·class="na">if</span><span·class="p"·data-group-id="2345654672-2">(</span><span·class="o">?</span><span·class="n">OTP_RELEASE</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="ow">andalso</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·212,·SHA:·2409d5524fb37064c1b9f485f2dc03632e38460c3b4d35fd8f02a4ec8d71ed9e·...·]-2">)</span><span·class="p">.</span><span·class="w">
252 </span><span·class="c1">%%·Debugging·code·that·requires·OTP·26·or·later.</span><span·class="w">252 </span><span·class="c1">%%·Debugging·code·that·requires·OTP·26·or·later.</span><span·class="w">
253 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">253 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
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148 single·function·that·constructs·the·map·using·the·map·syntax·and·always·use148 single·function·that·constructs·the·map·using·the·map·syntax·and·always·use
149 it.</p></li><li><p>Always·update·the·map·using·the·<code·class="inline">:=</code>·operator·(that·is,·requiring·that·an149 it.</p></li><li><p>Always·update·the·map·using·the·<code·class="inline">:=</code>·operator·(that·is,·requiring·that·an
150 element·with·that·key·already·exists).·The·<code·class="inline">:=</code>·operator·is·slightly·more150 element·with·that·key·already·exists).·The·<code·class="inline">:=</code>·operator·is·slightly·more
151 efficient,·and·it·helps·catching·mispellings·of·keys.</p></li><li><p>Whenever·possible,·match·multiple·map·elements·at·once.</p></li><li><p>Whenever·possible,·update·multiple·map·elements·at·once.</p></li><li><p>Avoid·default·values·and·the·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·function.·If·there·are·default151 efficient,·and·it·helps·catching·mispellings·of·keys.</p></li><li><p>Whenever·possible,·match·multiple·map·elements·at·once.</p></li><li><p>Whenever·possible,·update·multiple·map·elements·at·once.</p></li><li><p>Avoid·default·values·and·the·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·function.·If·there·are·default
152 values,·sharing·of·keys·between·different·instances·of·the·map·will·be·less152 values,·sharing·of·keys·between·different·instances·of·the·map·will·be·less
153 effective,·and·it·is·not·possible·to·match·multiple·elements·having·default153 effective,·and·it·is·not·possible·to·match·multiple·elements·having·default
154 values·in·one·go.</p></li><li><p>To·avoid·having·to·deal·with·a·map·that·may·lack·some·keys,·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#merge/2"><code·class="inline">maps:merge/2</code></a>·can154 values·in·one·go.</p></li><li><p>To·avoid·having·to·deal·with·a·map·that·may·lack·some·keys,·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#merge/2"><code·class="inline">maps:merge/2</code></a>·can
155 efficiently·add·multiple·default·values.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">DefaultMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5434957673-1">#{</span><span·class="ss">shoe_size</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">editor</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·126,·SHA:·4db6843b740924b45a1160925ecc21b1cfe80746ab54121e20f73fb00f137267·...·]-1">}</span><span·class="p">,</span><span·class="w">155 efficiently·add·multiple·default·values.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">DefaultMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9751607767-1">#{</span><span·class="ss">shoe_size</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">editor</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·126,·SHA:·30e894db799065e1183b3614e146be57dd3358cd18f1599dab473903654739f6·...·]-1">}</span><span·class="p">,</span><span·class="w">
156 </span><span·class="n">MapWithDefaultsApplied</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">merge</span><span·class="p"·data-group-id="5434957673-2">(</span><span·class="n">DefaultMap</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherMap</span><span·class="p"·data-group-id="5434957673-2">)</span></code></pre></li></ul><h2·id="using-maps-as-dictionaries"·class="section-heading">156 </span><span·class="n">MapWithDefaultsApplied</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">merge</span><span·class="p"·data-group-id="9751607767-2">(</span><span·class="n">DefaultMap</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherMap</span><span·class="p"·data-group-id="9751607767-2">)</span></code></pre></li></ul><h2·id="using-maps-as-dictionaries"·class="section-heading">
157 ··<a·href="#using-maps-as-dictionaries"·class="hover-link">157 ··<a·href="#using-maps-as-dictionaries"·class="hover-link">
158 ····<i·class="ri-link-m"·aria-hidden="true"></i>158 ····<i·class="ri-link-m"·aria-hidden="true"></i>
159 ··</a>159 ··</a>
160 ··<span·class="text">Using·Maps·as·Dictionaries</span>160 ··<span·class="text">Using·Maps·as·Dictionaries</span>
161 </h2>161 </h2>
162 <p>Using·a·map·as·a·dictionary·implies·the·following·usage·pattern:</p><ul><li>Keys·are·usually·variables·not·known·at·compile-time.</li><li>There·can·be·any·number·of·elements·in·the·map.</li><li>Usually,·no·more·than·one·element·is·looked·up·or·updated·at·once.</li></ul><p>Given·that·usage·pattern,·the·difference·in·performance·between·using·the·map162 <p>Using·a·map·as·a·dictionary·implies·the·following·usage·pattern:</p><ul><li>Keys·are·usually·variables·not·known·at·compile-time.</li><li>There·can·be·any·number·of·elements·in·the·map.</li><li>Usually,·no·more·than·one·element·is·looked·up·or·updated·at·once.</li></ul><p>Given·that·usage·pattern,·the·difference·in·performance·between·using·the·map
163 syntax·and·the·maps·module·is·usually·small.·Therefore,·which·one·to·use·is163 syntax·and·the·maps·module·is·usually·small.·Therefore,·which·one·to·use·is
Offset 167, 18 lines modifiedOffset 167, 18 lines modified
167 choice.</li></ul><h2·id="using-maps-as-sets"·class="section-heading">167 choice.</li></ul><h2·id="using-maps-as-sets"·class="section-heading">
168 ··<a·href="#using-maps-as-sets"·class="hover-link">168 ··<a·href="#using-maps-as-sets"·class="hover-link">
169 ····<i·class="ri-link-m"·aria-hidden="true"></i>169 ····<i·class="ri-link-m"·aria-hidden="true"></i>
170 ··</a>170 ··</a>
171 ··<span·class="text">Using·Maps·as·Sets</span>171 ··<span·class="text">Using·Maps·as·Sets</span>
172 </h2>172 </h2>
173 <p>Starting·in·OTP·24,·the·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html"><code·class="inline">sets</code></a>·module·has·an·option·to·represent·sets·as·maps.173 <p>Starting·in·OTP·24,·the·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html"><code·class="inline">sets</code></a>·module·has·an·option·to·represent·sets·as·maps.
174 Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="6294715693-1">(</span><span·class="p"·data-group-id="6294715693-2">[</span><span·class="p"·data-group-id="6294715693-3">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6294715693-3">}</[·...·truncated·by·diffoscope;·len:·99,·SHA:·0292a67349185172a86c5d46ce7bf9f8516bcb91107a5d421a39e320c38b4e9e·...·]-1">)</span><span·class="p">.</span><span·class="w">174 Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="0287673712-1">(</span><span·class="p"·data-group-id="0287673712-2">[</span><span·class="p"·data-group-id="0287673712-3">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="0287673712-3">}</[·...·truncated·by·diffoscope;·len:·99,·SHA:·947155a62dc63dcd70be78bca2353270e2104413f65df574aef0db664c0ce8bb·...·]-1">)</span><span·class="p">.</span><span·class="w">
175 </span><span·class="p"·data-group-id="6294715693-4">#{</span><span·class="p"·data-group-id="6294715693-4">}</span><span·class="gp·unselectable">175 </span><span·class="p"·data-group-id="0287673712-4">#{</span><span·class="p"·data-group-id="0287673712-4">}</span><span·class="gp·unselectable">
176 2&gt;·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="6294715693-5">(</span><span·class="p"·data-group-id="6294715693-6">[</span><span·class="ss">x</span><span·class="p">,</span><span·class="ss">y</span><span·class="p">,</span><span·class="ss">z</span><span·class="p"·data-group-id="6294715693-6">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6294715693-7">[</span><span·class="p"·data-group-id="6294715693-8">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6294715693-8">}</span><span·class="p"·data-group-id="6294715693-7">]</span><span·class="p"·data-group-id="6294715693-5">)</span><span·class="p">.</span><span·class="w"> 
177 </span><span·class="p"·data-group-id="6294715693-9">#{</span><span·class="ss">x</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6294715693-10">[</span><span·class="p"·data-group-id="629471569[·...·truncated·by·diffoscope;·len:·655,·SHA:·5327032ee8671626dd48f16e6edfbc4838cc5902103e3498fdb95b4c83499bc7·...·]176 2&gt;·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="0287673712-5">(</span><span·class="p"·data-group-id="0287673712-6">[</span><span·class="ss">x</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·557,·SHA:·8576a66d00ccc78379570720c5a7f39f667731c233836b56992c5886cd555779·...·]
 177 </span><span·class="p"·data-group-id="0287673712-9">#{</span><span·class="ss">x</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0287673712-10">[</span><span·class="p"·data-group-id="0287673712-10">]</span><span·class="p">,</span><span·class="ss">y</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0287673712-11">[</span><span·class="p"·data-group-id="0287673712-11">]</span><span·class="p">,</span><span·class="ss">z</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0287673712-12">[</span><span·class="p"·data-group-id="0287673712-12">]</span><span·class="p"·data-group-id="0287673712-9">}</span></code></pre><p><code·class="inline">sets</code>·backed·by·maps·is·generally·the·most·efficient·set·representation,·with·a
178 few·possible·exceptions:</p><ul><li><a·href="../../lib/stdlib-6.2.2/doc/html/ordsets.html#intersection/2"><code·class="inline">ordsets:intersection/2</code></a>·can·be·more·efficient·than·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#intersection/2"><code·class="inline">sets:intersection/2</code></a>.·If178 few·possible·exceptions:</p><ul><li><a·href="../../lib/stdlib-6.2.2/doc/html/ordsets.html#intersection/2"><code·class="inline">ordsets:intersection/2</code></a>·can·be·more·efficient·than·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#intersection/2"><code·class="inline">sets:intersection/2</code></a>.·If
179 the·intersection·operation·is·frequently·used·and·operations·that·operate·on·a179 the·intersection·operation·is·frequently·used·and·operations·that·operate·on·a
180 single·element·in·a·set·(such·as·<code·class="inline">is_element/2</code>)·are·avoided,·<a·href="../../lib/stdlib-6.2.2/doc/html/ordsets.html"><code·class="inline">ordsets</code></a>·can180 single·element·in·a·set·(such·as·<code·class="inline">is_element/2</code>)·are·avoided,·<a·href="../../lib/stdlib-6.2.2/doc/html/ordsets.html"><code·class="inline">ordsets</code></a>·can
181 be·a·better·choice·than·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html"><code·class="inline">sets</code></a>.</li><li>If·the·intersection·operation·is·frequently·used·and·operations·that·operate181 be·a·better·choice·than·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html"><code·class="inline">sets</code></a>.</li><li>If·the·intersection·operation·is·frequently·used·and·operations·that·operate
182 on·a·single·element·in·a·set·(such·as·<code·class="inline">is_element/2</code>)·must·also·be·efficient,182 on·a·single·element·in·a·set·(such·as·<code·class="inline">is_element/2</code>)·must·also·be·efficient,
183 <a·href="../../lib/stdlib-6.2.2/doc/html/gb_sets.html"><code·class="inline">gb_sets</code></a>·can·potentially·be·a·better·choice·than·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html"><code·class="inline">sets</code></a>.</li><li>If·the·elements·of·the·set·are·integers·in·a·fairly·compact·range,·the·set·can183 <a·href="../../lib/stdlib-6.2.2/doc/html/gb_sets.html"><code·class="inline">gb_sets</code></a>·can·potentially·be·a·better·choice·than·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html"><code·class="inline">sets</code></a>.</li><li>If·the·elements·of·the·set·are·integers·in·a·fairly·compact·range,·the·set·can
184 be·represented·as·an·integer·where·each·bit·represents·an·element·in·the·set.184 be·represented·as·an·integer·where·each·bit·represents·an·element·in·the·set.
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203 for·the·runtime·system).</p></li><li><p><strong>N</strong>·-·The·number·of·elements·in·the·map.</p></li><li><p><strong>Keys</strong>·-·A·tuple·with·keys·of·the·map:·<code·class="inline">{Key1,...,KeyN}</code>.·The·keys·are203 for·the·runtime·system).</p></li><li><p><strong>N</strong>·-·The·number·of·elements·in·the·map.</p></li><li><p><strong>Keys</strong>·-·A·tuple·with·keys·of·the·map:·<code·class="inline">{Key1,...,KeyN}</code>.·The·keys·are
204 sorted.</p></li><li><p><strong>Value1</strong>·-·The·value·corresponding·to·the·first·key·in·the·key·tuple.</p></li><li><p><strong>ValueN</strong>·-·The·value·corresponding·to·the·last·key·in·the·key·tuple.</p></li></ul><p>As·an·example,·let·us·look·at·how·the·map·<code·class="inline">#{a·=&gt;·foo,·z·=&gt;·bar}</code>·is204 sorted.</p></li><li><p><strong>Value1</strong>·-·The·value·corresponding·to·the·first·key·in·the·key·tuple.</p></li><li><p><strong>ValueN</strong>·-·The·value·corresponding·to·the·last·key·in·the·key·tuple.</p></li></ul><p>As·an·example,·let·us·look·at·how·the·map·<code·class="inline">#{a·=&gt;·foo,·z·=&gt;·bar}</code>·is
205 represented:</p><table><thead><tr><th·style="text-align:·center;">0</th><th·style="text-align:·left;">1</th><th·style="text-align:·center;">2</th><th·style="text-align:·center;">3</th><th·style="text-align:·left;">4</th></tr></thead><tbody><tr><td·style="text-align:·center;"><strong>FLATMAP</strong></td><td·style="text-align:·left;"><em>2</em></td><td·style="text-align:·center;"><code·class="inline">{a,z}</code></td><td·style="text-align:·center;"><code·class="inline">foo</code></td><td·style="text-align:·left;"><code·class="inline">bar</code></td></tr></tbody></table><p><em>Table:·#{a·=&gt;·foo,·z·=&gt;·bar}</em></p><p>Let·us·update·the·map:·<code·class="inline">M#{q·=&gt;·baz}</code>.·The·map·now·looks·like·this:</p><table><thead><tr><th·style="text-align:·center;">0</th><th·style="text-align:·left;">1</th><th·style="text-align:·center;">2</th><th·style="text-align:·center;">3</th><th·style="text-align:·center;">4</th><th·style="text-align:·center;">5</th></tr></thead><tbody><tr><td·style="text-align:·center;"><strong>FLATMAP</strong></td><td·style="text-align:·left;"><em>3</em></td><td·style="text-align:·center;"><code·class="inline">{a,q,z}</code></td><td·style="text-align:·center;"><code·class="inline">foo</code></td><td·style="text-align:·center;"><code·class="inline">baz</code></td><td·style="text-align:·center;"><code·class="inline">bar</code></td></tr></tbody></table><p><em>Table:·#{a·=&gt;·foo,·q·=&gt;·baz,·z·=&gt;·bar}</em></p><p>Finally,·change·the·value·of·one·element:·<code·class="inline">M#{z·:=·bird}</code>.·The·map·now·looks205 represented:</p><table><thead><tr><th·style="text-align:·center;">0</th><th·style="text-align:·left;">1</th><th·style="text-align:·center;">2</th><th·style="text-align:·center;">3</th><th·style="text-align:·left;">4</th></tr></thead><tbody><tr><td·style="text-align:·center;"><strong>FLATMAP</strong></td><td·style="text-align:·left;"><em>2</em></td><td·style="text-align:·center;"><code·class="inline">{a,z}</code></td><td·style="text-align:·center;"><code·class="inline">foo</code></td><td·style="text-align:·left;"><code·class="inline">bar</code></td></tr></tbody></table><p><em>Table:·#{a·=&gt;·foo,·z·=&gt;·bar}</em></p><p>Let·us·update·the·map:·<code·class="inline">M#{q·=&gt;·baz}</code>.·The·map·now·looks·like·this:</p><table><thead><tr><th·style="text-align:·center;">0</th><th·style="text-align:·left;">1</th><th·style="text-align:·center;">2</th><th·style="text-align:·center;">3</th><th·style="text-align:·center;">4</th><th·style="text-align:·center;">5</th></tr></thead><tbody><tr><td·style="text-align:·center;"><strong>FLATMAP</strong></td><td·style="text-align:·left;"><em>3</em></td><td·style="text-align:·center;"><code·class="inline">{a,q,z}</code></td><td·style="text-align:·center;"><code·class="inline">foo</code></td><td·style="text-align:·center;"><code·class="inline">baz</code></td><td·style="text-align:·center;"><code·class="inline">bar</code></td></tr></tbody></table><p><em>Table:·#{a·=&gt;·foo,·q·=&gt;·baz,·z·=&gt;·bar}</em></p><p>Finally,·change·the·value·of·one·element:·<code·class="inline">M#{z·:=·bird}</code>.·The·map·now·looks
206 like·this:</p><table><thead><tr><th·style="text-align:·center;">0</th><th·style="text-align:·left;">1</th><th·style="text-align:·center;">2</th><th·style="text-align:·center;">3</th><th·style="text-align:·center;">4</th><th·style="text-align:·center;">5</th></tr></thead><tbody><tr><td·style="text-align:·center;"><strong>FLATMAP</strong></td><td·style="text-align:·left;"><em>3</em></td><td·style="text-align:·center;"><code·class="inline">{a,q,z}</code></td><td·style="text-align:·center;"><code·class="inline">foo</code></td><td·style="text-align:·center;"><code·class="inline">baz</code></td><td·style="text-align:·center;"><code·class="inline">bird</code></td></tr></tbody></table><p><em>Table:·#{a·=&gt;·foo,·q·=&gt;·baz,·z·=&gt;·bird}</em></p><p>When·the·value·for·an·existing·key·is·updated,·the·key·tuple·is·not·updated,206 like·this:</p><table><thead><tr><th·style="text-align:·center;">0</th><th·style="text-align:·left;">1</th><th·style="text-align:·center;">2</th><th·style="text-align:·center;">3</th><th·style="text-align:·center;">4</th><th·style="text-align:·center;">5</th></tr></thead><tbody><tr><td·style="text-align:·center;"><strong>FLATMAP</strong></td><td·style="text-align:·left;"><em>3</em></td><td·style="text-align:·center;"><code·class="inline">{a,q,z}</code></td><td·style="text-align:·center;"><code·class="inline">foo</code></td><td·style="text-align:·center;"><code·class="inline">baz</code></td><td·style="text-align:·center;"><code·class="inline">bird</code></td></tr></tbody></table><p><em>Table:·#{a·=&gt;·foo,·q·=&gt;·baz,·z·=&gt;·bird}</em></p><p>When·the·value·for·an·existing·key·is·updated,·the·key·tuple·is·not·updated,
207 allowing·the·key·tuple·to·be·shared·with·other·instances·of·the·map·that·have207 allowing·the·key·tuple·to·be·shared·with·other·instances·of·the·map·that·have
208 the·same·keys.·In·fact,·the·key·tuple·can·be·shared·between·all·maps·with·the208 the·same·keys.·In·fact,·the·key·tuple·can·be·shared·between·all·maps·with·the
209 same·keys·with·some·care.·To·arrange·that,·define·a·function·that·returns·a·map.209 same·keys·with·some·care.·To·arrange·that,·define·a·function·that·returns·a·map.
210 For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">new</span><span·class="p"·data-group-id="9276585565-1">(</span><span·class="p"·data-group-id="9276585565-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">new</span><span·class="p"·data-group-id="7461772537-1">(</span><span·class="p"·data-group-id="7461772537-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ····</span><span·class="p"·data-group-id="9276585565-2">#{</span><span·class="ss">a</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·300,·SHA:·4384e1aabe008433608eb7311ae13690d72f0d06a41a9c3eeff75caa44410e8a·...·]-2">}</span><span·class="p">.</span></code></pre><p>Defined·like·this,·the·key·tuple·<code·class="inline">{a,b,c}</code>·will·be·a·global·literal.·To·ensure211 ····</span><span·class="p"·data-group-id="7461772537-2">#{</span><span·class="ss">a</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·300,·SHA:·777b58823ce3fc10c65b582e05c6e29da190776d15511347c9ca63de1d58f1e1·...·]-2">}</span><span·class="p">.</span></code></pre><p>Defined·like·this,·the·key·tuple·<code·class="inline">{a,b,c}</code>·will·be·a·global·literal.·To·ensure
212 that·the·key·tuple·is·shared·when·creating·an·instance·of·the·map,·always·call212 that·the·key·tuple·is·shared·when·creating·an·instance·of·the·map,·always·call
213 <code·class="inline">new()</code>·and·modify·the·returned·map:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p"·data-group-id="3226966575-1">(</span><span·class="n">SOME_MODULE</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="3226966575-2">(</span><span·class="p"·data-group-id="3226966575-2">)</span><span·class="p"·data-group-id="3226966575-1"[·...·truncated·by·diffoscope;·len:·228,·SHA:·7de07b653282b4186e908c9537890afdf502295a047d1b05fd80d7d2c03b01c0·...·]-3">}</span><span·class="p">.</span></code></pre><p>Using·the·map·syntax·with·small·maps·is·particularly·efficient.·As·long·as·the213 <code·class="inline">new()</code>·and·modify·the·returned·map:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p"·data-group-id="3592371199-1">(</span><span·class="n">SOME_MODULE</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="3592371199-2">(</span><span·class="p"·data-group-id="3592371199-2">)</span><span·class="p"·data-group-id="3592371199-1"[·...·truncated·by·diffoscope;·len:·228,·SHA:·9ba0861cec64d9b8ebb03e90b1a7da2bb2320d4b8ff58a31c37852eef7cadb8c·...·]-3">}</span><span·class="p">.</span></code></pre><p>Using·the·map·syntax·with·small·maps·is·particularly·efficient.·As·long·as·the
214 keys·are·known·at·compile-time,·the·map·is·updated·in·one·go,·making·the·time·to214 keys·are·known·at·compile-time,·the·map·is·updated·in·one·go,·making·the·time·to
215 update·a·map·essentially·constant·regardless·of·the·number·of·keys·updated.·The215 update·a·map·essentially·constant·regardless·of·the·number·of·keys·updated.·The
216 same·goes·for·matching.·(When·the·keys·are·variables,·one·or·more·of·the·keys216 same·goes·for·matching.·(When·the·keys·are·variables,·one·or·more·of·the·keys
217 could·be·identical,·so·the·operations·need·to·be·performed·sequentially·from217 could·be·identical,·so·the·operations·need·to·be·performed·sequentially·from
218 left·to·right.)</p><p>The·memory·size·for·a·small·map·is·the·size·of·all·keys·and·values·plus·5·words.218 left·to·right.)</p><p>The·memory·size·for·a·small·map·is·the·size·of·all·keys·and·values·plus·5·words.
219 See·<a·href="memory.html">Memory</a>·for·more·information·about·memory·sizes.</p><h3·id="how-large-maps-are-implemented"·class="section-heading">219 See·<a·href="memory.html">Memory</a>·for·more·information·about·memory·sizes.</p><h3·id="how-large-maps-are-implemented"·class="section-heading">
220 ··<a·href="#how-large-maps-are-implemented"·class="hover-link">220 ··<a·href="#how-large-maps-are-implemented"·class="hover-link">
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241 ··<a·href="#using-the-map-syntax"·class="hover-link">241 ··<a·href="#using-the-map-syntax"·class="hover-link">
242 ····<i·class="ri-link-m"·aria-hidden="true"></i>242 ····<i·class="ri-link-m"·aria-hidden="true"></i>
243 ··</a>243 ··</a>
244 ··<span·class="text">Using·the·Map·Syntax</span>244 ··<span·class="text">Using·the·Map·Syntax</span>
245 </h2>245 </h2>
246 <p>Using·the·map·syntax·is·usually·slightly·more·efficient·than·using·the246 <p>Using·the·map·syntax·is·usually·slightly·more·efficient·than·using·the
247 corresponding·function·in·the·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html"><code·class="inline">maps</code></a>·module.</p><p>The·gain·in·efficiency·for·the·map·syntax·is·more·noticeable·for·the·following247 corresponding·function·in·the·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html"><code·class="inline">maps</code></a>·module.</p><p>The·gain·in·efficiency·for·the·map·syntax·is·more·noticeable·for·the·following
248 operations·that·can·only·be·achieved·using·the·map·syntax:</p><ul><li>Matching·multiple·literal·keys</li><li>Updating·multiple·literal·keys</li><li>Adding·multiple·literal·keys·to·a·map</li></ul><p>For·example:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map1</span><span·class="p"·data-group-id="0990437182-1">#{</span><span·class="ss">x</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">y</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·820,·SHA:·c4495137a2af441d73bcd4daf8189db624fe0bab2f95f2ab858b02d7a50e7620·...·]-1">)</span><span·class="p">,</span><span·class="w">248 operations·that·can·only·be·achieved·using·the·map·syntax:</p><ul><li>Matching·multiple·literal·keys</li><li>Updating·multiple·literal·keys</li><li>Adding·multiple·literal·keys·to·a·map</li></ul><p>For·example:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map1</span><span·class="p"·data-group-id="8723619498-1">#{</span><span·class="ss">x</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">y</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·820,·SHA:·2a866b66fb86a43e378f2931eb416a93be00c3a7a9d941bf46248783d704933f·...·]-1">)</span><span·class="p">,</span><span·class="w">
249 </span><span·class="n">Map3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">update</span><span·class="p"·data-group-id="6129530182-2">(</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Map2</span><span·class="p"·data-group-id="6129530182-2">)</span><span·class="p">,</span><span·class="w">249 </span><span·class="n">Map3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">update</span><span·class="p"·data-group-id="6618672310-2">(</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Map2</span><span·class="p"·data-group-id="6618672310-2">)</span><span·class="p">,</span><span·class="w">
250 </span><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">update</span><span·class="p"·data-group-id="6129530182-3">(</span><span·class="ss">z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Map3</span><span·class="p"·data-group-id="6129530182-3">)</span></code></pre><p>If·the·map·is·a·small·map,·the·first·example·runs·roughly·three·times·as·fast.</p><p>Note·that·for·variable·keys,·the·elements·are·updated·sequentially·from·left·to250 </span><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">update</span><span·class="p"·data-group-id="6618672310-3">(</span><span·class="ss">z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Map3</span><span·class="p"·data-group-id="6618672310-3">)</span></code></pre><p>If·the·map·is·a·small·map,·the·first·example·runs·roughly·three·times·as·fast.</p><p>Note·that·for·variable·keys,·the·elements·are·updated·sequentially·from·left·to
251 right.·For·example,·given·the·following·update·with·variable·keys:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map1</span><span·class="p"·data-group-id="0054838326-1">#{</span><span·class="n">Key1</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key2</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·276,·SHA:·0b6805bbc15c3d9fa140db1cbb4b5a200642826dc394291cac8d8781931ecf3c·...·]-1">}</span></code></pre><p>the·compiler·rewrites·it·like·this·to·ensure·that·the·updates·are·applied·from251 right.·For·example,·given·the·following·update·with·variable·keys:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map1</span><span·class="p"·data-group-id="8757877331-1">#{</span><span·class="n">Key1</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key2</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·276,·SHA:·2e5953fdfea2d04918a4c6d5fb89417e16b9fdb3f2738a3be9670d207336e51d·...·]-1">}</span></code></pre><p>the·compiler·rewrites·it·like·this·to·ensure·that·the·updates·are·applied·from
252 left·to·right:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Map2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map1</span><span·class="p"·data-group-id="1118594063-1">#{</span><span·class="n">Key1</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="1118594063-1">}</span><span·class="p">,</span><span·class="w">252 left·to·right:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Map2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map1</span><span·class="p"·data-group-id="6461472532-1">#{</span><span·class="n">Key1</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="6461472532-1">}</span><span·class="p">,</span><span·class="w">
253 </span><span·class="n">Map3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map2</span><span·class="p"·data-group-id="1118594063-2">#{</span><span·class="n">Key2</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="1118594063-2">}</span><span·class="p">,</span><span·class="w">253 </span><span·class="n">Map3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map2</span><span·class="p"·data-group-id="6461472532-2">#{</span><span·class="n">Key2</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6461472532-2">}</span><span·class="p">,</span><span·class="w">
254 </span><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map3</span><span·class="p"·data-group-id="1118594063-3">#{</span><span·class="n">Key3</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Z</span><span·class="p"·data-group-id="1118594063-3">}</span></code></pre><p>If·a·key·is·known·to·exist·in·a·map,·using·the·<code·class="inline">:=</code>·operator·is·slightly·more254 </span><span·class="n">Map</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Map3</span><span·class="p"·data-group-id="6461472532-3">#{</span><span·class="n">Key3</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Z</span><span·class="p"·data-group-id="6461472532-3">}</span></code></pre><p>If·a·key·is·known·to·exist·in·a·map,·using·the·<code·class="inline">:=</code>·operator·is·slightly·more
255 efficient·than·using·the·<code·class="inline">=&gt;</code>·operator·for·a·small·map.</p><h2·id="using-the-functions-in-the-maps-module"·class="section-heading">255 efficient·than·using·the·<code·class="inline">=&gt;</code>·operator·for·a·small·map.</p><h2·id="using-the-functions-in-the-maps-module"·class="section-heading">
256 ··<a·href="#using-the-functions-in-the-maps-module"·class="hover-link">256 ··<a·href="#using-the-functions-in-the-maps-module"·class="hover-link">
257 ····<i·class="ri-link-m"·aria-hidden="true"></i>257 ····<i·class="ri-link-m"·aria-hidden="true"></i>
258 ··</a>258 ··</a>
259 ··<span·class="text">Using·the·Functions·in·the·maps·Module</span>259 ··<span·class="text">Using·the·Functions·in·the·maps·Module</span>
260 </h2>260 </h2>
261 <p>Here·follows·some·notes·about·most·of·the·functions·in·the·<code·class="inline">maps</code>·module.·For261 <p>Here·follows·some·notes·about·most·of·the·functions·in·the·<code·class="inline">maps</code>·module.·For
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306 ··<a·href="#maps-get-3"·class="hover-link">306 ··<a·href="#maps-get-3"·class="hover-link">
307 ····<i·class="ri-link-m"·aria-hidden="true"></i>307 ····<i·class="ri-link-m"·aria-hidden="true"></i>
308 ··</a>308 ··</a>
309 ··<span·class="text">maps:get/3</span>309 ··<span·class="text">maps:get/3</span>
310 </h3>310 </h3>
311 <p>As·an·optimization,·the·compiler·will·rewrite·a·call·to·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·to·Erlang311 <p>As·an·optimization,·the·compiler·will·rewrite·a·call·to·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·to·Erlang
312 code·similar·to·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Result</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Map</span><span·class="w">·</span><span·class="k">of</span><span·class="w">312 code·similar·to·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Result</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Map</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
313 ·············</span><span·class="p"·data-group-id="3174705371-1">#{</span><span·class="n">Key</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Value</span><span·class="p"·data-group-id="3174705371-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="p">;</span><span·class="w">313 ·············</span><span·class="p"·data-group-id="7784342191-1">#{</span><span·class="n">Key</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Value</span><span·class="p"·data-group-id="7784342191-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="p">;</span><span·class="w">
314 ·············</span><span·class="p"·data-group-id="3174705371-2">#{</span><span·class="p"·data-group-id="3174705371-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Default</span><span·class="w">314 ·············</span><span·class="p"·data-group-id="7784342191-2">#{</span><span·class="p"·data-group-id="7784342191-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Default</span><span·class="w">
315 ·········</span><span·class="k">end</span></code></pre><p>This·is·reasonably·efficient,·but·if·a·small·map·is·used·as·an·alternative·to315 ·········</span><span·class="k">end</span></code></pre><p>This·is·reasonably·efficient,·but·if·a·small·map·is·used·as·an·alternative·to
316 using·a·record·it·is·often·better·not·to·rely·on·default·values·as·it·prevents316 using·a·record·it·is·often·better·not·to·rely·on·default·values·as·it·prevents
317 sharing·of·keys,·which·may·in·the·end·use·more·memory·than·what·you·save·from317 sharing·of·keys,·which·may·in·the·end·use·more·memory·than·what·you·save·from
318 not·storing·default·values·in·the·map.</p><p>If·default·values·are·nevertheless·required,·instead·of·calling·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>318 not·storing·default·values·in·the·map.</p><p>If·default·values·are·nevertheless·required,·instead·of·calling·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>
319 multiple·times,·consider·putting·the·default·values·in·a·map·and·merging·that319 multiple·times,·consider·putting·the·default·values·in·a·map·and·merging·that
320 map·with·the·other·map:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">DefaultMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4018412129-1">#{</span><span·class="n">Key1</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Value2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key2</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·420,·SHA:·cc9aba6062e3724a201dbef5bfb5c6daa4f54fce026ff1e3037829241748fb38·...·]-1">}</span><span·class="p">,</span><span·class="w">320 map·with·the·other·map:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">DefaultMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3874526742-1">#{</span><span·class="n">Key1</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Value2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key2</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·420,·SHA:·c314282771c37a6d7dbb57b0a2b1d1a7da7fddbe4b14102d20412d457b4d6924·...·]-1">}</span><span·class="p">,</span><span·class="w">
321 </span><span·class="n">MapWithDefaultsApplied</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">merge</span><span·class="p"·data-group-id="4018412129-2">(</span><span·class="n">DefaultMap</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherMap</span><span·class="p"·data-group-id="4018412129-2">)</span></code></pre><p>This·helps·share·keys·between·the·default·map·and·the·one·you·applied·defaults321 </span><span·class="n">MapWithDefaultsApplied</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">merge</span><span·class="p"·data-group-id="3874526742-2">(</span><span·class="n">DefaultMap</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherMap</span><span·class="p"·data-group-id="3874526742-2">)</span></code></pre><p>This·helps·share·keys·between·the·default·map·and·the·one·you·applied·defaults
322 to,·as·long·as·the·default·map·contains·<em>all</em>·the·keys·that·will·ever·be·used322 to,·as·long·as·the·default·map·contains·<em>all</em>·the·keys·that·will·ever·be·used
323 and·not·just·the·ones·with·default·values.·Whether·this·is·faster·than·calling323 and·not·just·the·ones·with·default·values.·Whether·this·is·faster·than·calling
324 <a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·multiple·times·depends·on·the·size·of·the·map·and·the·number·of324 <a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·multiple·times·depends·on·the·size·of·the·map·and·the·number·of
325 default·values.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·OTP·26.0·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·was·implemented·by·calling·the·function·instead325 default·values.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·OTP·26.0·<a·href="../../lib/stdlib-6.2.2/doc/html/maps.html#get/3"><code·class="inline">maps:get/3</code></a>·was·implemented·by·calling·the·function·instead
326 of·rewriting·it·as·an·Erlang·expression.·It·is·now·slightly·faster·but·can·no326 of·rewriting·it·as·an·Erlang·expression.·It·is·now·slightly·faster·but·can·no
327 longer·be·traced.</p></section><h3·id="maps-intersect-2-maps-intersect_with-3"·class="section-heading">327 longer·be·traced.</p></section><h3·id="maps-intersect-2-maps-intersect_with-3"·class="section-heading">
328 ··<a·href="#maps-intersect-2-maps-intersect_with-3"·class="hover-link">328 ··<a·href="#maps-intersect-2-maps-intersect_with-3"·class="hover-link">
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519 ······<p·class="built-using">519 ······<p·class="built-using">
520 ········Built·using520 ········Built·using
521 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the521 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
522 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>522 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
523 ······</p>523 ······</p>
524 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>524 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
525 ····</footer>525 ····</footer>
526 ··</div>526 ··</div>
527 </main>527 </main>
528 </div>528 </div>
529 <script>529 <script>
530 ··function·mermaidLoaded()·{530 ··function·mermaidLoaded()·{
531 ····mermaid.initialize({531 ····mermaid.initialize({
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218 ······<p·class="built-using">218 ······<p·class="built-using">
219 ········Built·using219 ········Built·using
220 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the220 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
221 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>221 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
222 ······</p>222 ······</p>
223 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>223 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
224 ····</footer>224 ····</footer>
225 ··</div>225 ··</div>
226 </main>226 </main>
227 </div>227 </div>
228 <script>228 <script>
229 ··function·mermaidLoaded()·{229 ··function·mermaidLoaded()·{
230 ····mermaid.initialize({230 ····mermaid.initialize({
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238 ········Built·using238 ········Built·using
239 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the239 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
240 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>240 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
241 ······</p>241 ······</p>
242 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>242 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
243 ····</footer>243 ····</footer>
244 ··</div>244 ··</div>
245 </main>245 </main>
246 </div>246 </div>
247 <script>247 <script>
248 ··function·mermaidLoaded()·{248 ··function·mermaidLoaded()·{
249 ····mermaid.initialize({249 ····mermaid.initialize({
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118 <h2·id="module-syntax"·class="section-heading">118 <h2·id="module-syntax"·class="section-heading">
119 ··<a·href="#module-syntax"·class="hover-link">119 ··<a·href="#module-syntax"·class="hover-link">
120 ····<i·class="ri-link-m"·aria-hidden="true"></i>120 ····<i·class="ri-link-m"·aria-hidden="true"></i>
121 ··</a>121 ··</a>
122 ··<span·class="text">Module·Syntax</span>122 ··<span·class="text">Module·Syntax</span>
123 </h2>123 </h2>
124 <p>Erlang·code·is·divided·into·<em>modules</em>.·A·module·consists·of·a·sequence·of124 <p>Erlang·code·is·divided·into·<em>modules</em>.·A·module·consists·of·a·sequence·of
125 attributes·and·function·declarations,·each·terminated·by·a·period·(<code·class="inline">.</code>).</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9744187702-1">(</span><span·class="ss">m</span><span·class="p"·data-group-id="9744187702-1">)</span><span·class="p">.</span><span·class="w">··········</span><span·class="c1">%·module·attribute</span><span·class="w"> 
126 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9744187702-2">(</span><span·class="p"·data-group-id="9744187702-3">[</span><span·class="ss">fact</span><span·class="p">/</span><span·class="mi">1</span><span·class=[·...·truncated·by·diffoscope;·len:·134,·SHA:·0dd30b0d62033ddb8d31feeb3385c4cc49bf281cf02604f56f34da5296f64512·...·]···</span><span·class="c1">%·module·attribute</span><span·class="w">125 attributes·and·function·declarations,·each·terminated·by·a·period·(<code·class="inline">.</code>).</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·150,·SHA:·0a5fbca9f511bd58f40d50875a3ced499a1bf8d91ca40c31333cf198d0da5269·...·]···</span><span·class="c1">%·module·attribute</span><span·class="w">
 126 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0224572805-2">(</span><span·class="p"·data-group-id="0224572805-3">[</span><span·class="ss">fact</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="0224572805-3">]</span><span·class="p"·data-group-id="0224572805-2">)</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·module·attribute</span><span·class="w">
  
127 </span><span·class="nf">fact</span><span·class="p"·data-group-id="9744187702-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="9744187702-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="o">&gt;</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="c1">%·beginning·of·function·declaration</span><span·class="w">127 </span><span·class="nf">fact</span><span·class="p"·data-group-id="0224572805-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="0224572805-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="o">&gt;</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="c1">%·beginning·of·function·declaration</span><span·class="w">
128 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="9744187702-5">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="9744187702-5">)</span><span·class="p">;</span><span·class="w">···</span><span·class="c1">%··|</span><span·class="w">128 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="0224572805-5">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="0224572805-5">)</span><span·class="p">;</span><span·class="w">···</span><span·class="c1">%··|</span><span·class="w">
129 </span><span·class="nf">fact</span><span·class="p"·data-group-id="9744187702-6">(</span><span·class="mi">0</span><span·class="p"·data-group-id="9744187702-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···········</span><span·class="c1">%··|</span><span·class="w">129 </span><span·class="nf">fact</span><span·class="p"·data-group-id="0224572805-6">(</span><span·class="mi">0</span><span·class="p"·data-group-id="0224572805-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···········</span><span·class="c1">%··|</span><span·class="w">
130 ····</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">···············</span><span·class="c1">%·end·of·function·declaration</span></code></pre><p>For·a·description·of·function·declarations,·see130 ····</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">···············</span><span·class="c1">%·end·of·function·declaration</span></code></pre><p>For·a·description·of·function·declarations,·see
131 <a·href="ref_man_functions.html">Function·Declaration·Syntax</a>.</p><h2·id="module-attributes"·class="section-heading">131 <a·href="ref_man_functions.html">Function·Declaration·Syntax</a>.</p><h2·id="module-attributes"·class="section-heading">
132 ··<a·href="#module-attributes"·class="hover-link">132 ··<a·href="#module-attributes"·class="hover-link">
133 ····<i·class="ri-link-m"·aria-hidden="true"></i>133 ····<i·class="ri-link-m"·aria-hidden="true"></i>
134 ··</a>134 ··</a>
135 ··<span·class="text">Module·Attributes</span>135 ··<span·class="text">Module·Attributes</span>
136 </h2>136 </h2>
Offset 176, 71 lines modifiedOffset 176, 71 lines modified
176 meaning.</p></section></li></ul><h3·id="behaviour-module-attribute"·class="section-heading">176 meaning.</p></section></li></ul><h3·id="behaviour-module-attribute"·class="section-heading">
177 ··<a·href="#behaviour-module-attribute"·class="hover-link">177 ··<a·href="#behaviour-module-attribute"·class="hover-link">
178 ····<i·class="ri-link-m"·aria-hidden="true"></i>178 ····<i·class="ri-link-m"·aria-hidden="true"></i>
179 ··</a>179 ··</a>
180 ··<span·class="text">Behaviour·Module·Attribute</span>180 ··<span·class="text">Behaviour·Module·Attribute</span>
181 </h3>181 </h3>
182 <p>It·is·possible·to·specify·that·the·module·is·the·callback·module·for·a182 <p>It·is·possible·to·specify·that·the·module·is·the·callback·module·for·a
183 <em>behaviour</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="5994176960-1">(</span><span·class="n">Behaviour</span><span·class="p"·data-group-id="5994176960-1">)</span><span·class="p">.</span></code></pre><p>The·atom·<code·class="inline">Behaviour</code>·gives·the·name·of·the·behaviour,·which·can·be·a183 <em>behaviour</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="0522471765-1">(</span><span·class="n">Behaviour</span><span·class="p"·data-group-id="0522471765-1">)</span><span·class="p">.</span></code></pre><p>The·atom·<code·class="inline">Behaviour</code>·gives·the·name·of·the·behaviour,·which·can·be·a
184 user-defined·behaviour·or·one·of·the·following·OTP·standard·behaviours:</p><ul><li><code·class="inline">gen_server</code></li><li><code·class="inline">gen_statem</code></li><li><code·class="inline">gen_event</code></li><li><code·class="inline">supervisor</code></li></ul><p>The·spelling·<code·class="inline">behavior</code>·is·also·accepted.</p><p>The·callback·functions·of·the·module·can·be·specified·either·directly·by·the184 user-defined·behaviour·or·one·of·the·following·OTP·standard·behaviours:</p><ul><li><code·class="inline">gen_server</code></li><li><code·class="inline">gen_statem</code></li><li><code·class="inline">gen_event</code></li><li><code·class="inline">supervisor</code></li></ul><p>The·spelling·<code·class="inline">behavior</code>·is·also·accepted.</p><p>The·callback·functions·of·the·module·can·be·specified·either·directly·by·the
185 exported·function·<code·class="inline">behaviour_info/1</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">behaviour_info</span><span·class="p"·data-group-id="7890506432-1">(</span><span·class="ss">callbacks</span><span·class="p"·data-group-id="7890506432-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Callbacks</span><span·class="p">.</span></code></pre><p>[·...·truncated·by·diffoscope;·len:·368,·SHA:·234c20ec1a9b7cd3fdb4e6ff9ee0576e33b32684d3690034c891528bc5732820·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Result</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">Arguments</code>·is·a·list·of·zero·or·more·arguments.·The·<code·class="inline">-callback</code>·attribute185 exported·function·<code·class="inline">behaviour_info/1</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">behaviour_info</span><span·class="p"·data-group-id="6863775039-1">(</span><span·class="ss">callbacks</span><span·class="p"·data-group-id="6863775039-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Callbacks</span><span·class="p">.</span></code></pre><p>[·...·truncated·by·diffoscope;·len:·368,·SHA:·89f1518398ed43a0a21ed8e00bbe58fb7f43a29e5059d0d70a645db365925916·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Result</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">Arguments</code>·is·a·list·of·zero·or·more·arguments.·The·<code·class="inline">-callback</code>·attribute
186 is·to·be·preferred·since·the·extra·type·information·can·be·used·by·tools·to186 is·to·be·preferred·since·the·extra·type·information·can·be·used·by·tools·to
187 produce·documentation·or·find·discrepancies.</p><p>Read·more·about·behaviours·and·callback·modules·in187 produce·documentation·or·find·discrepancies.</p><p>Read·more·about·behaviours·and·callback·modules·in
188 <a·href="../../doc/system/spec_proc.html#behaviours">OTP·Design·Principles</a>.</p><h3·id="record-definitions"·class="section-heading">188 <a·href="../../doc/system/spec_proc.html#behaviours">OTP·Design·Principles</a>.</p><h3·id="record-definitions"·class="section-heading">
189 ··<a·href="#record-definitions"·class="hover-link">189 ··<a·href="#record-definitions"·class="hover-link">
190 ····<i·class="ri-link-m"·aria-hidden="true"></i>190 ····<i·class="ri-link-m"·aria-hidden="true"></i>
191 ··</a>191 ··</a>
192 ··<span·class="text">Record·Definitions</span>192 ··<span·class="text">Record·Definitions</span>
193 </h3>193 </h3>
194 <p>The·same·syntax·as·for·module·attributes·is·used·for·record·definitions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="6117004451-1">(</span><span·class="n">Record</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fields</span><span·class="p"·data-group-id="6117004451-1">)</span><span·class="p">.</span></code></pre><p>Record·definitions·are·allowed·anywhere·in·a·module,·also·among·the·function194 <p>The·same·syntax·as·for·module·attributes·is·used·for·record·definitions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7579181328-1">(</span><span·class="n">Record</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fields</span><span·class="p"·data-group-id="7579181328-1">)</span><span·class="p">.</span></code></pre><p>Record·definitions·are·allowed·anywhere·in·a·module,·also·among·the·function
195 declarations.·Read·more·in·<a·href="ref_man_records.html">Records</a>.</p><h3·id="preprocessor"·class="section-heading">195 declarations.·Read·more·in·<a·href="ref_man_records.html">Records</a>.</p><h3·id="preprocessor"·class="section-heading">
196 ··<a·href="#preprocessor"·class="hover-link">196 ··<a·href="#preprocessor"·class="hover-link">
197 ····<i·class="ri-link-m"·aria-hidden="true"></i>197 ····<i·class="ri-link-m"·aria-hidden="true"></i>
198 ··</a>198 ··</a>
199 ··<span·class="text">Preprocessor</span>199 ··<span·class="text">Preprocessor</span>
200 </h3>200 </h3>
201 <p>The·same·syntax·as·for·module·attributes·is·used·by·the·preprocessor,·which201 <p>The·same·syntax·as·for·module·attributes·is·used·by·the·preprocessor,·which
202 supports·file·inclusion,·macros,·and·conditional·compilation:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="7094288474-1">(</span><span·class="s">&quot;SomeFile.hrl&quot;</span><span·class="p"·data-group-id="7094288474-1">)</span><span·class="p">.</span><span·class="w">202 supports·file·inclusion,·macros,·and·conditional·compilation:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="2530039364-1">(</span><span·class="s">&quot;SomeFile.hrl&quot;</span><span·class="p"·data-group-id="2530039364-1">)</span><span·class="p">.</span><span·class="w">
203 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7094288474-2">(</span><span·class="n">Macro</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Replacement</span><span·class="p"·data-group-id="7094288474-2">)</span><span·class="p">.</span></code></pre><p>Read·more·in·<a·href="macros.html">Preprocessor</a>.</p><h3·id="setting-file-and-line"·class="section-heading">203 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2530039364-2">(</span><span·class="n">Macro</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Replacement</span><span·class="p"·data-group-id="2530039364-2">)</span><span·class="p">.</span></code></pre><p>Read·more·in·<a·href="macros.html">Preprocessor</a>.</p><h3·id="setting-file-and-line"·class="section-heading">
204 ··<a·href="#setting-file-and-line"·class="hover-link">204 ··<a·href="#setting-file-and-line"·class="hover-link">
205 ····<i·class="ri-link-m"·aria-hidden="true"></i>205 ····<i·class="ri-link-m"·aria-hidden="true"></i>
206 ··</a>206 ··</a>
207 ··<span·class="text">Setting·File·and·Line</span>207 ··<span·class="text">Setting·File·and·Line</span>
208 </h3>208 </h3>
209 <p>The·same·syntax·as·for·module·attributes·is·used·for·changing·the·pre-defined209 <p>The·same·syntax·as·for·module·attributes·is·used·for·changing·the·pre-defined
210 macros·<code·class="inline">?FILE</code>·and·<code·class="inline">?LINE</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">file</span><span·class="p"·data-group-id="8032326645-1">(</span><span·class="n">File</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Line</span><span·class="p"·data-group-id="8032326645-1">)</span><span·class="p">.</span></code></pre><p>This·attribute·is·used·by·tools,·such·as·Yecc,·to·inform·the·compiler·that·the210 macros·<code·class="inline">?FILE</code>·and·<code·class="inline">?LINE</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">file</span><span·class="p"·data-group-id="3745195162-1">(</span><span·class="n">File</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Line</span><span·class="p"·data-group-id="3745195162-1">)</span><span·class="p">.</span></code></pre><p>This·attribute·is·used·by·tools,·such·as·Yecc,·to·inform·the·compiler·that·the
211 source·program·is·generated·by·another·tool.·It·also·indicates·the211 source·program·is·generated·by·another·tool.·It·also·indicates·the
212 correspondence·of·source·files·to·lines·of·the·original·user-written·file,·from212 correspondence·of·source·files·to·lines·of·the·original·user-written·file,·from
213 which·the·source·program·is·produced.</p><h3·id="types-and-function-specifications"·class="section-heading">213 which·the·source·program·is·produced.</p><h3·id="types-and-function-specifications"·class="section-heading">
214 ··<a·href="#types-and-function-specifications"·class="hover-link">214 ··<a·href="#types-and-function-specifications"·class="hover-link">
215 ····<i·class="ri-link-m"·aria-hidden="true"></i>215 ····<i·class="ri-link-m"·aria-hidden="true"></i>
216 ··</a>216 ··</a>
217 ··<span·class="text">Types·and·function·specifications</span>217 ··<span·class="text">Types·and·function·specifications</span>
218 </h3>218 </h3>
219 <p>A·similar·syntax·as·for·module·attributes·is·used·for·specifying·types·and219 <p>A·similar·syntax·as·for·module·attributes·is·used·for·specifying·types·and
220 function·specifications:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">my_type</span><span·class="p"·data-group-id="4391776378-1">(</span><span·class="p"·data-group-id="4391776378-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="4391776378-2">(</span><span·class="p"·data-group-id="4391776378-2">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4391776378-3">(</span><span·class="p"·data-group-id="4391776378-3">)</span><span·class="p">.</span><span·class="w"> 
221 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">my_function</span><span·class="p"·data-group-id="4391776378-4">(</span><span·class="nf">integer</span><span·class="p"·data-group-id="4391776378-5">(</span><[·...·truncated·by·diffoscope;·len:·467,·SHA:·12e2ff4fb3ca869d7b1fa63896591569ddd2077c4f3edb23513efc1f1964641e·...·]220 function·specifications:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">my_type</span><span·class="p"·data-group-id="9605194551-1">(</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·512,·SHA:·c597b80b3768472f996de55430dc49479863cc8112bf3a470a6e90e438094ee8·...·]
 221 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">my_function</span><span·class="p"·data-group-id="9605194551-4">(</span><span·class="nf">integer</span><span·class="p"·data-group-id="9605194551-5">(</span><span·class="p"·data-group-id="9605194551-5">)</span><span·class="p"·data-group-id="9605194551-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9605194551-6">(</span><span·class="p"·data-group-id="9605194551-6">)</span><span·class="p">.</span></code></pre><p>Read·more·in·<a·href="typespec.html">Types·and·Function·specifications</a>.</p><p>The·description·is·based·on
222 <a·href="http://www.erlang.org/eeps/eep-0008.html">EEP8·-·Types·and·function·specifications</a>,222 <a·href="http://www.erlang.org/eeps/eep-0008.html">EEP8·-·Types·and·function·specifications</a>,
223 which·is·not·to·be·further·updated.</p><h3·id="documentation-attributes"·class="section-heading">223 which·is·not·to·be·further·updated.</p><h3·id="documentation-attributes"·class="section-heading">
224 ··<a·href="#documentation-attributes"·class="hover-link">224 ··<a·href="#documentation-attributes"·class="hover-link">
225 ····<i·class="ri-link-m"·aria-hidden="true"></i>225 ····<i·class="ri-link-m"·aria-hidden="true"></i>
226 ··</a>226 ··</a>
227 ··<span·class="text">Documentation·attributes</span>227 ··<span·class="text">Documentation·attributes</span>
228 </h3>228 </h3>
229 <p>The·module·attribute·<code·class="inline">-doc(Documentation)</code>·is·used·to·provide·user·documentation229 <p>The·module·attribute·<code·class="inline">-doc(Documentation)</code>·is·used·to·provide·user·documentation
230 for·a·function/type/callback:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="0812720159-1">(</span><span·class="s">&quot;Example·documentation&quot;</span><span·class="p"·data-group-id="0812720159-1">)</span><span·class="p">.</span><span·class="w">230 for·a·function/type/callback:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="7758290750-1">(</span><span·class="s">&quot;Example·documentation&quot;</span><span·class="p"·data-group-id="7758290750-1">)</span><span·class="p">.</span><span·class="w">
231 </span><span·class="nf">example</span><span·class="p"·data-group-id="0812720159-2">(</span><span·class="p"·data-group-id="0812720159-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>The·attribute·should·be·placed·just·before·the·entity·it·documents.The231 </span><span·class="nf">example</span><span·class="p"·data-group-id="7758290750-2">(</span><span·class="p"·data-group-id="7758290750-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>The·attribute·should·be·placed·just·before·the·entity·it·documents.The
232 parenthesis·are·optional·around·<code·class="inline">Documentation</code>.·The·allowed·values·for232 parenthesis·are·optional·around·<code·class="inline">Documentation</code>.·The·allowed·values·for
233 <code·class="inline">Documentation</code>·are:</p><ul><li><p><strong><a·href="data_types.html#string">literal·string</a>·or233 <code·class="inline">Documentation</code>·are:</p><ul><li><p><strong><a·href="data_types.html#string">literal·string</a>·or
234 <a·href="expressions.html#unicode-segments">utf-8·encoded·binary·string</a></strong>·-·The·string234 <a·href="expressions.html#unicode-segments">utf-8·encoded·binary·string</a></strong>·-·The·string
235 documenting·the·entity.·Any·literal·string·is·allowed,·so·both235 documenting·the·entity.·Any·literal·string·is·allowed,·so·both
236 <a·href="data_types.html#tqstring">triple·quoted·strings</a>·and236 <a·href="data_types.html#tqstring">triple·quoted·strings</a>·and
237 <a·href="data_types.html#sigil">sigils</a>·that·translate·to·literal·strings·can·be·used.237 <a·href="data_types.html#sigil">sigils</a>·that·translate·to·literal·strings·can·be·used.
238 The·following·examples·are·equivalent:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="1122548823-1">(</span><span·class="s">&quot;Example·\&quot;docs\&quot;&quot;</span><span·class="p"·data-group-id="1122548823-1">)</span><span·class="p">.</span><span·class="w">238 The·following·examples·are·equivalent:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="5141513853-1">(</span><span·class="s">&quot;Example·\&quot;docs\&quot;&quot;</span><span·class="p"·data-group-id="5141513853-1">)</span><span·class="p">.</span><span·class="w">
239 </span><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="1122548823-2">(</span><span·class="p"·data-group-id="1122548823-3">&lt;&lt;</span><span·class="s">&quot;Example·\&quot;docs\&quot;&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="1122548823-3">&gt;&gt;</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·d269f25d820eefcbd1411879327fd01d3187c04cba33749a0ba69bd4bc1cd016·...·]3-2">)</span><span·class="p">.</span><span·class="w">239 </span><span·class="p">-</span><span·class="na">doc</span><span·class="p"·data-group-id="5141513853-2">(</span><span·class="p"·data-group-id="5141513853-3">&lt;&lt;</span><span·class="s">&quot;Example·\&quot;docs\&quot;&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="5141513853-3">&gt;&gt;</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·2e01107f78e1f00eb300fc562c238831414060f9e837a6437e7732983afb35cc·...·]3-2">)</span><span·class="p">.</span><span·class="w">
240 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">~S/Example·&quot;docs&quot;/</span><span·class="p">.</span><span·class="w">240 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">~S/Example·&quot;docs&quot;/</span><span·class="p">.</span><span·class="w">
241 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;241 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;
242 ···Example·&quot;</span><span·class="ss">docs</span><span·class="s">&quot;242 ···Example·&quot;</span><span·class="ss">docs</span><span·class="s">&quot;
243 ···&quot;</span><span·class="s">&quot;&quot;</span><span·class="w">243 ···&quot;</span><span·class="s">&quot;&quot;</span><span·class="w">
244 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">~B|Example·&quot;docs&quot;|</span><span·class="p">.</span></code></pre><p>For·clarity·it·is·recommended·to·use·either·normal·<code·class="inline">&quot;strings&quot;</code>·or·triple244 </span><span·class="p">-</span><span·class="na">doc</span><span·class="w">·</span><span·class="s">~B|Example·&quot;docs&quot;|</span><span·class="p">.</span></code></pre><p>For·clarity·it·is·recommended·to·use·either·normal·<code·class="inline">&quot;strings&quot;</code>·or·triple
245 quoted·strings·for·documentation·attributes.</p></li><li><p><strong><code·class="inline">{file,</code>·<a·href="../../lib/kernel-10.2.6/doc/html/file.html#t:name/0"><code·class="inline">file:name/0</code></a>·<code·class="inline">}</code></strong>·-·Read·the·contents·of·filename·and·use245 quoted·strings·for·documentation·attributes.</p></li><li><p><strong><code·class="inline">{file,</code>·<a·href="../../lib/kernel-10.2.6/doc/html/file.html#t:name/0"><code·class="inline">file:name/0</code></a>·<code·class="inline">}</code></strong>·-·Read·the·contents·of·filename·and·use
246 that·as·the·documentation·string.</p></li><li><p><strong><code·class="inline">false</code></strong>·-·Set·the·current·entity·as·hidden,·that·is,·it·should·not·be246 that·as·the·documentation·string.</p></li><li><p><strong><code·class="inline">false</code></strong>·-·Set·the·current·entity·as·hidden,·that·is,·it·should·not·be
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253 ··<a·href="#the-feature-directive"·class="hover-link">253 ··<a·href="#the-feature-directive"·class="hover-link">
254 ····<i·class="ri-link-m"·aria-hidden="true"></i>254 ····<i·class="ri-link-m"·aria-hidden="true"></i>
255 ··</a>255 ··</a>
256 ··<span·class="text">The·feature·directive</span>256 ··<span·class="text">The·feature·directive</span>
257 </h2>257 </h2>
258 <p>While·not·a·module·attribute,·but·rather·a·directive·(since·it·might·affect258 <p>While·not·a·module·attribute,·but·rather·a·directive·(since·it·might·affect
259 syntax),·there·is·the·<code·class="inline">-feature(..)</code>·directive·used·for·enabling·and·disabling259 syntax),·there·is·the·<code·class="inline">-feature(..)</code>·directive·used·for·enabling·and·disabling
260 <a·href="../../doc/system/features.html#features">features</a>.</p><p>The·syntax·is·similar·to·that·of·an·attribute,·but·has·two·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">feature</span><span·class="p"·data-group-id="1437204206-1">(</span><span·class="n">FeatureName</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">enable</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">disable</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·21,·SHA:·32c873a75e37902cf240a4cff7e4acfee9a29db6f2d8576c4d0bfd57e8ac21b6·...·]6-1">)</span><span·class="p">.</span></code></pre><p>Note·that·the·<a·href="macros.html#feature-directive">feature·directive</a>·can·only·appear260 <a·href="../../doc/system/features.html#features">features</a>.</p><p>The·syntax·is·similar·to·that·of·an·attribute,·but·has·two·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">feature</span><span·class="p"·data-group-id="3329149146-1">(</span><span·class="n">FeatureName</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">enable</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">disable</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·21,·SHA:·c6e2128755cf7057f58fdfc8fe8dcf4610795529373504d9b375872e2e428b79·...·]6-1">)</span><span·class="p">.</span></code></pre><p>Note·that·the·<a·href="macros.html#feature-directive">feature·directive</a>·can·only·appear
261 in·a·prefix·of·the·module.</p><h2·id="comments"·class="section-heading">261 in·a·prefix·of·the·module.</p><h2·id="comments"·class="section-heading">
262 ··<a·href="#comments"·class="hover-link">262 ··<a·href="#comments"·class="hover-link">
263 ····<i·class="ri-link-m"·aria-hidden="true"></i>263 ····<i·class="ri-link-m"·aria-hidden="true"></i>
264 ··</a>264 ··</a>
265 ··<span·class="text">Comments</span>265 ··<span·class="text">Comments</span>
266 </h2>266 </h2>
267 <p>Comments·can·be·placed·anywhere·in·a·module·except·within·strings·and267 <p>Comments·can·be·placed·anywhere·in·a·module·except·within·strings·and
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347 ······<p·class="built-using">347 ······<p·class="built-using">
348 ········Built·using348 ········Built·using
349 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the349 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
350 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>350 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
351 ······</p>351 ······</p>
352 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>352 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
353 ····</footer>353 ····</footer>
354 ··</div>354 ··</div>
355 </main>355 </main>
356 </div>356 </div>
357 <script>357 <script>
358 ··function·mermaidLoaded()·{358 ··function·mermaidLoaded()·{
359 ····mermaid.initialize({359 ····mermaid.initialize({
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133 ··<span·class="text">Erlang·Program</span>133 ··<span·class="text">Erlang·Program</span>
134 </h2>134 </h2>
135 <p>Even·if·all·functions·of·a·module·are·NIFs,·an·Erlang·module·is·still·needed·for135 <p>Even·if·all·functions·of·a·module·are·NIFs,·an·Erlang·module·is·still·needed·for
136 two·reasons:</p><ul><li>The·NIF·library·must·be·explicitly·loaded·by·Erlang·code·in·the·same·module.</li><li>All·NIFs·of·a·module·must·have·an·Erlang·implementation·as·well.</li></ul><p>Normally·these·are·minimal·stub·implementations·that·throw·an·exception.·But136 two·reasons:</p><ul><li>The·NIF·library·must·be·explicitly·loaded·by·Erlang·code·in·the·same·module.</li><li>All·NIFs·of·a·module·must·have·an·Erlang·implementation·as·well.</li></ul><p>Normally·these·are·minimal·stub·implementations·that·throw·an·exception.·But
137 they·can·also·be·used·as·fallback·implementations·for·functions·that·do·not·have137 they·can·also·be·used·as·fallback·implementations·for·functions·that·do·not·have
138 native·implementations·on·some·architectures.</p><p>NIF·libraries·are·loaded·by·calling·<a·href="../../erts-15.2.6/doc/html/erlang.html#load_nif/2"><code·class="inline">erlang:load_nif/2</code></a>,·with·the·name·of·the138 native·implementations·on·some·architectures.</p><p>NIF·libraries·are·loaded·by·calling·<a·href="../../erts-15.2.6/doc/html/erlang.html#load_nif/2"><code·class="inline">erlang:load_nif/2</code></a>,·with·the·name·of·the
139 shared·library·as·argument.·The·second·argument·can·be·any·term·that·will·be139 shared·library·as·argument.·The·second·argument·can·be·any·term·that·will·be
140 passed·on·to·the·library·and·used·for·initialization:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3555427349-1">(</span><span·class="ss">complex6</span><span·class="p"·data-group-id="3555427349-1">)</span><span·class="p">.</span><span·class="w">140 passed·on·to·the·library·and·used·for·initialization:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3498517056-1">(</span><span·class="ss">complex6</span><span·class="p"·data-group-id="3498517056-1">)</span><span·class="p">.</span><span·class="w">
141 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3555427349-2">(</span><span·class="p"·data-group-id="3555427349-3">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·c[·...·truncated·by·diffoscope;·len:·112,·SHA:·74381b77afcf6d047b9cb4917f1b3385c0580c9493e300649a039447d648ad54·...·]-2">)</span><span·class="p">.</span><span·class="w">141 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3498517056-2">(</span><span·class="p"·data-group-id="3498517056-3">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·c[·...·truncated·by·diffoscope;·len:·112,·SHA:·5d6564baf6feba0929d9bd8879ffce1b3b9094cc15611b6e489ffce7d5e7413f·...·]-2">)</span><span·class="p">.</span><span·class="w">
142 </span><span·class="p">-</span><span·class="na">nifs</span><span·class="p"·data-group-id="3555427349-4">(</span><span·class="p"·data-group-id="3555427349-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·c[·...·truncated·by·diffoscope;·len:·112,·SHA:·648fd66f2374d85937842d6bf9c2bc675e3c57127a4db985be5bcae5fa65998c·...·]-4">)</span><span·class="p">.</span><span·class="w">142 </span><span·class="p">-</span><span·class="na">nifs</span><span·class="p"·data-group-id="3498517056-4">(</span><span·class="p"·data-group-id="3498517056-5">[</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">/</span><span·c[·...·truncated·by·diffoscope;·len:·112,·SHA:·84da7834c0c3f8a47b6a72bcd7cd2a789696b78ed8fad40edb38406a075c1dad·...·]-4">)</span><span·class="p">.</span><span·class="w">
143 </span><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="3555427349-6">(</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3555427349-6">)</span><span·class="p">.</span><span·class="w">143 </span><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="3498517056-6">(</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3498517056-6">)</span><span·class="p">.</span><span·class="w">
  
144 </span><span·class="nf">init</span><span·class="p"·data-group-id="3555427349-7">(</span><span·class="p"·data-group-id="3555427349-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">144 </span><span·class="nf">init</span><span·class="p"·data-group-id="3498517056-7">(</span><span·class="p"·data-group-id="3498517056-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
145 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="3555427349-8">(</span><span·class="s">&quot;./complex6_nif&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="3555427349-8">)</span><span·class="p">.</span><span·class="w">145 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="3498517056-8">(</span><span·class="s">&quot;./complex6_nif&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="3498517056-8">)</span><span·class="p">.</span><span·class="w">
  
146 </span><span·class="nf">foo</span><span·class="p"·data-group-id="3555427349-9">(</span><span·class="p">_</span><span·class="n">X</span><span·class="p"·data-group-id="3555427349-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">146 </span><span·class="nf">foo</span><span·class="p"·data-group-id="3498517056-9">(</span><span·class="p">_</span><span·class="n">X</span><span·class="p"·data-group-id="3498517056-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
147 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">nif_error</span><span·class="p"·data-group-id="3555427349-10">(</span><span·class="ss">nif_library_not_loaded</span><span·class="p"·data-group-id="3555427349-10">)</span><span·class="p">.</span><span·class="w">147 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">nif_error</span><span·class="p"·data-group-id="3498517056-10">(</span><span·class="ss">nif_library_not_loaded</span><span·class="p"·data-group-id="3498517056-10">)</span><span·class="p">.</span><span·class="w">
148 </span><span·class="nf">bar</span><span·class="p"·data-group-id="3555427349-11">(</span><span·class="p">_</span><span·class="n">Y</span><span·class="p"·data-group-id="3555427349-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">148 </span><span·class="nf">bar</span><span·class="p"·data-group-id="3498517056-11">(</span><span·class="p">_</span><span·class="n">Y</span><span·class="p"·data-group-id="3498517056-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
149 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">nif_error</span><span·class="p"·data-group-id="3555427349-12">(</span><span·class="ss">nif_library_not_loaded</span><span·class="p"·data-group-id="3555427349-12">)</span><span·class="p">.</span></code></pre><p>Here,·the·directive·<code·class="inline">on_load</code>·is·used·to·get·function·<code·class="inline">init</code>·to·be·automatically149 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">nif_error</span><span·class="p"·data-group-id="3498517056-12">(</span><span·class="ss">nif_library_not_loaded</span><span·class="p"·data-group-id="3498517056-12">)</span><span·class="p">.</span></code></pre><p>Here,·the·directive·<code·class="inline">on_load</code>·is·used·to·get·function·<code·class="inline">init</code>·to·be·automatically
150 called·when·the·module·is·loaded.·If·<code·class="inline">init</code>·returns·anything·other·than·<code·class="inline">ok</code>,150 called·when·the·module·is·loaded.·If·<code·class="inline">init</code>·returns·anything·other·than·<code·class="inline">ok</code>,
151 such·when·the·loading·of·the·NIF·library·fails·in·this·example,·the·module·is151 such·when·the·loading·of·the·NIF·library·fails·in·this·example,·the·module·is
152 unloaded·and·calls·to·functions·within·it,·fail.</p><p>Loading·the·NIF·library·overrides·the·stub·implementations·and·cause·calls·to152 unloaded·and·calls·to·functions·within·it,·fail.</p><p>Loading·the·NIF·library·overrides·the·stub·implementations·and·cause·calls·to
153 <code·class="inline">foo</code>·and·<code·class="inline">bar</code>·to·be·dispatched·to·the·NIF·implementations·instead.</p><h2·id="nif-library-code"·class="section-heading">153 <code·class="inline">foo</code>·and·<code·class="inline">bar</code>·to·be·dispatched·to·the·NIF·implementations·instead.</p><h2·id="nif-library-code"·class="section-heading">
154 ··<a·href="#nif-library-code"·class="hover-link">154 ··<a·href="#nif-library-code"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
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209 ··<a·href="#running-the-example"·class="hover-link">209 ··<a·href="#running-the-example"·class="hover-link">
210 ····<i·class="ri-link-m"·aria-hidden="true"></i>210 ····<i·class="ri-link-m"·aria-hidden="true"></i>
211 ··</a>211 ··</a>
212 ··<span·class="text">Running·the·Example</span>212 ··<span·class="text">Running·the·Example</span>
213 </h2>213 </h2>
214 <p><em>Step·1.</em>·Compile·the·C·code:</p><pre><code·class="text">unix&gt;·gcc·-o·complex6_nif.so·-fpic·-shared·complex.c·complex6_nif.c214 <p><em>Step·1.</em>·Compile·the·C·code:</p><pre><code·class="text">unix&gt;·gcc·-o·complex6_nif.so·-fpic·-shared·complex.c·complex6_nif.c
215 windows&gt;·cl·-LD·-MD·-Fe·complex6_nif.dll·complex.c·complex6_nif.c</code></pre><p><em>Step·2:</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="ss">erl</span><span·class="w">215 windows&gt;·cl·-LD·-MD·-Fe·complex6_nif.dll·complex.c·complex6_nif.c</code></pre><p><em>Step·2:</em>·Start·Erlang·and·compile·the·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="ss">erl</span><span·class="w">
216 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R13B04</span><span·class="w">·</span><span·class="p"·data-group-id="9623376931-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.7</span><span·class="p">.</span><span·class="mi">5</span><span·class="p"·data-group-id="9623376931-1">)</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1130,·SHA:·b297e334b4b7ccc1fe3cdd4c213d6a54994d6afdb152c153d6dcb42a36154cc2·...·]-6">]</span><span·class="w">216 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R13B04</span><span·class="w">·</span><span·class="p"·data-group-id="8118917412-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.7</span><span·class="p">.</span><span·class="mi">5</span><span·class="p"·data-group-id="8118917412-1">)</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1130,·SHA:·0cf16417da0090433500ca2f0488d39f46f66d0ccdc66c8841585f26dae88bd3·...·]-6">]</span><span·class="w">
  
217 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">7.5</span><span·class="w">··</span><span·class="p"·data-group-id="9623376931-7">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="9623376931-7">)</span><span·class="gp·unselectable">217 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">7.5</span><span·class="w">··</span><span·class="p"·data-group-id="8118917412-7">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="8118917412-7">)</span><span·class="gp·unselectable">
218 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="9623376931-8">(</span><span·class="ss">complex6</span><span·class="p"·data-group-id="9623376931-8">)</span><span·class="p">.</span><span·class="w">218 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="8118917412-8">(</span><span·class="ss">complex6</span><span·class="p"·data-group-id="8118917412-8">)</span><span·class="p">.</span><span·class="w">
219 </span><span·class="p"·data-group-id="9623376931-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">complex6</span><span·class="p"·data-group-id="9623376931-9">}</span></code></pre><p><em>Step·3:</em>·Run·the·example:</p><pre><code·class="makeup·erlang"·translate="no[·...·truncated·by·diffoscope;·len:·247,·SHA:·26871cc8778f1a6823295d6f7344eef73f8c9412c87781b5838067b42d11e47c·...·]-1">)</span><span·class="p">.</span><span·class="w">219 </span><span·class="p"·data-group-id="8118917412-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">complex6</span><span·class="p"·data-group-id="8118917412-9">}</span></code></pre><p><em>Step·3:</em>·Run·the·example:</p><pre><code·class="makeup·erlang"·translate="no[·...·truncated·by·diffoscope;·len:·247,·SHA:·0197754bdaf53774671670c4b4733c1511aba9f7a4cac16451c85759eafc8a84·...·]-1">)</span><span·class="p">.</span><span·class="w">
220 </span><span·class="mi">4</span><span·class="gp·unselectable">220 </span><span·class="mi">4</span><span·class="gp·unselectable">
221 4&gt;·</span><span·class="nc">complex6</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="7224544341-2">(</span><span·class="mi">5</span><span·class="p"·data-group-id="7224544341-2">)</span><span·class="p">.</span><span·class="w">221 4&gt;·</span><span·class="nc">complex6</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="3273130532-2">(</span><span·class="mi">5</span><span·class="p"·data-group-id="3273130532-2">)</span><span·class="p">.</span><span·class="w">
222 </span><span·class="mi">10</span><span·class="gp·unselectable">222 </span><span·class="mi">10</span><span·class="gp·unselectable">
223 5&gt;·</span><span·class="nc">complex6</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="7224544341-3">(</span><span·class="s">&quot;not·an·integer&quot;</span><span·class="p"·data-group-id="7224544341-3">)</span><span·class="p">.</span><span·class="w">223 5&gt;·</span><span·class="nc">complex6</span><span·class="p">:</span><span·class="nf">foo</span><span·class="p"·data-group-id="3273130532-3">(</span><span·class="s">&quot;not·an·integer&quot;</span><span·class="p"·data-group-id="3273130532-3">)</span><span·class="p">.</span><span·class="w">
224 </span><span·class="gt">**·exception·error:·bad·argument224 </span><span·class="gt">**·exception·error:·bad·argument
225 ·····in·function··complex6:foo/1225 ·····in·function··complex6:foo/1
226 ········called·as·comlpex6:foo(&quot;not·an·integer&quot;)</span></code></pre>226 ········called·as·comlpex6:foo(&quot;not·an·integer&quot;)</span></code></pre>
227 </div>227 </div>
  
228 <div·class="bottom-actions"·id="bottom-actions">228 <div·class="bottom-actions"·id="bottom-actions">
229 ··<div·class="bottom-actions-item">229 ··<div·class="bottom-actions-item">
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271 ······<p·class="built-using">271 ······<p·class="built-using">
272 ········Built·using272 ········Built·using
273 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the273 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
274 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>274 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
275 ······</p>275 ······</p>
276 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>276 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
277 ····</footer>277 ····</footer>
278 ··</div>278 ··</div>
279 </main>279 </main>
280 </div>280 </div>
281 <script>281 <script>
282 ··function·mermaidLoaded()·{282 ··function·mermaidLoaded()·{
283 ····mermaid.initialize({283 ····mermaid.initialize({
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122 ··<span·class="text">Opaque·Type·Aliases</span>122 ··<span·class="text">Opaque·Type·Aliases</span>
123 </h2>123 </h2>
124 <p>The·main·use·case·for·opacity·in·Erlang·is·to·hide·the·implementation·of·a·data124 <p>The·main·use·case·for·opacity·in·Erlang·is·to·hide·the·implementation·of·a·data
125 type,·enabling·evolving·the·API·while·minimizing·the·risk·of·breaking·consumers.125 type,·enabling·evolving·the·API·while·minimizing·the·risk·of·breaking·consumers.
126 The·runtime·does·not·check·opacity.·Dialyzer·provides·some·opacity-checking,·but126 The·runtime·does·not·check·opacity.·Dialyzer·provides·some·opacity-checking,·but
127 the·rest·is·up·to·convention.</p><p>This·document·explains·what·Erlang·opacity·is·(and·the·trade-offs·involved)·via127 the·rest·is·up·to·convention.</p><p>This·document·explains·what·Erlang·opacity·is·(and·the·trade-offs·involved)·via
128 the·example·of·the·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#t:set/0"><code·class="inline">sets:set()</code></a>·data·type.·This·type·<em>was</em>128 the·example·of·the·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#t:set/0"><code·class="inline">sets:set()</code></a>·data·type.·This·type·<em>was</em>
129 defined·in·the·<code·class="inline">sets</code>·module·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">set</span><span·class="p"·data-group-id="7017533679-1">(</span><span·class="n">Element</span><span·class="p"·data-group-id="7017533679-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">set</span><span·class="p"·data-group-id="7017533679-2">{</span><span·class="ss">segs</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">segs</span><span·class="p"·data-group-id="7017533679-3">(</span><span·class="n">Element</span><span·class="p"·data-group-id="7017533679-3">)</span><span·class="p"·data-group-id="7017533679-2">}</span><span·class="p">.</span></code></pre><p>OTP·24·changed·the·definition·to·the·following·in 
130 <a·href="https://github.com/erlang/otp/commit/e66941e8d7c47b973dff94c0308ea85a6be1958e">this·commit</a>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">set</[·...·truncated·by·diffoscope;·len:·1135,·SHA:·dcf1c273c3c910336a2cafd66fb2b255303c4d7ecf8226b810a82d23bc40e822·...·]129 defined·in·the·<code·class="inline">sets</code>·module·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">set</span><span·class="p"·data-group-id="424[·...·truncated·by·diffoscope;·len:·732,·SHA:·c2be601b665ad62ad305aa4cbff243893542f43453722ecaa910fdc7539c687a·...·]
 130 <a·href="https://github.com/erlang/otp/commit/e66941e8d7c47b973dff94c0308ea85a6be1958e">this·commit</a>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">set</span><span·class="p"·data-group-id="0419471483-1">(</span><span·class="n">Element</span><span·class="p"·data-group-id="0419471483-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">set</span><span·class="p"·data-group-id="0419471483-2">{</span><span·class="ss">segs</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">segs</span><span·class="p"·data-group-id="0419471483-3">(</span><span·class="n">Element</span><span·class="p"·data-group-id="0419471483-3">)</span><span·class="p"·data-group-id="0419471483-2">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="0419471483-4">#{</span><span·class="n">Element</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="o">?</span><span·class="n">VALUE</span><span·class="p"·data-group-id="0419471483-4">}</span><span·class="p">.</span></code></pre><p>And·this·change·was·safer·and·more·backwards-compatible·than·if·the·type·had
131 been·defined·with·<code·class="inline">-type</code>·instead·of·<code·class="inline">-opaque</code>.·Here·is·why:·when·a·module131 been·defined·with·<code·class="inline">-type</code>·instead·of·<code·class="inline">-opaque</code>.·Here·is·why:·when·a·module
132 defines·an·<code·class="inline">-opaque</code>,·the·contract·is·that·only·the·defining·module·should·rely132 defines·an·<code·class="inline">-opaque</code>,·the·contract·is·that·only·the·defining·module·should·rely
133 on·the·definition·of·the·type:·no·other·modules·should·rely·on·the·definition.</p><p>This·means·that·code·that·pattern-matched·on·<code·class="inline">set</code>·as·a·record/tuple·technically133 on·the·definition·of·the·type:·no·other·modules·should·rely·on·the·definition.</p><p>This·means·that·code·that·pattern-matched·on·<code·class="inline">set</code>·as·a·record/tuple·technically
134 broke·the·contract,·and·opted·in·to·being·potentially·broken·when·the·definition134 broke·the·contract,·and·opted·in·to·being·potentially·broken·when·the·definition
135 of·<code·class="inline">set()</code>·changed.·Before·OTP·24,·this·code·printed·<code·class="inline">ok</code>.·In·OTP·24·it·may135 of·<code·class="inline">set()</code>·changed.·Before·OTP·24,·this·code·printed·<code·class="inline">ok</code>.·In·OTP·24·it·may
136 error:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="3590947082-1">(</span><span·class="p"·data-group-id="3590947082-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">136 error:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="5951929520-1">(</span><span·class="p"·data-group-id="5951929520-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
137 ····</span><span·class="n">Set</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="3590947082-2">(</span><span·class="n">Set</span><span·class="p"·data-group-id="3590947082-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">137 ····</span><span·class="n">Set</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="5951929520-2">(</span><span·class="n">Set</span><span·class="p"·data-group-id="5951929520-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
138 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3590947082-3">(</span><span·class="s">&quot;ok&quot;</span><span·class="p"·data-group-id="3590947082-3">)</span><span·class="w">138 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5951929520-3">(</span><span·class="s">&quot;ok&quot;</span><span·class="p"·data-group-id="5951929520-3">)</span><span·class="w">
139 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p><strong>When·working·with·an·opaque·defined·in·another·module,·here·are·some139 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p><strong>When·working·with·an·opaque·defined·in·another·module,·here·are·some
140 recommendations:</strong></p><ul><li>Don't·examine·the·underlying·type·using·pattern-matching,·guards,·or·functions140 recommendations:</strong></p><ul><li>Don't·examine·the·underlying·type·using·pattern-matching,·guards,·or·functions
141 that·reveal·the·type,·such·as·<a·href="../../erts-15.2.6/doc/html/erlang.html#tuple_size/1"><code·class="inline">tuple_size/1</code></a>·.</li><li>Instead,·use·functions·provided·by·the·module·for·working·with·the·type.·For141 that·reveal·the·type,·such·as·<a·href="../../erts-15.2.6/doc/html/erlang.html#tuple_size/1"><code·class="inline">tuple_size/1</code></a>·.</li><li>Instead,·use·functions·provided·by·the·module·for·working·with·the·type.·For
142 example,·<code·class="inline">sets</code>·module·provides·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#new/0"><code·class="inline">sets:new/0</code></a>,·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#add_element/2"><code·class="inline">sets:add_element/2</code></a>,142 example,·<code·class="inline">sets</code>·module·provides·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#new/0"><code·class="inline">sets:new/0</code></a>,·<a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#add_element/2"><code·class="inline">sets:add_element/2</code></a>,
143 <a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#is_element/2"><code·class="inline">sets:is_element/2</code></a>,·and·so·on.</li><li><p><a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#t:set/1"><code·class="inline">sets:set(a)</code></a>·is·a·subtype·of·<code·class="inline">sets:set(a·|·b)</code>·and·not·the143 <a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#is_element/2"><code·class="inline">sets:is_element/2</code></a>,·and·so·on.</li><li><p><a·href="../../lib/stdlib-6.2.2/doc/html/sets.html#t:set/1"><code·class="inline">sets:set(a)</code></a>·is·a·subtype·of·<code·class="inline">sets:set(a·|·b)</code>·and·not·the
144 other·way·around.·Generally,·you·can·rely·on·the·property·that·<code·class="inline">the_opaque(T)</code>144 other·way·around.·Generally,·you·can·rely·on·the·property·that·<code·class="inline">the_opaque(T)</code>
145 is·a·subtype·of·<code·class="inline">the_opaque(U)</code>·when·T·is·a·subtype·of·U.</p></li></ul><p><strong>When·defining·your·own·opaques,·here·are·some·recommendations:</strong></p><ul><li>Since·consumers·are·expected·to·not·rely·on·the·definition·of·the·opaque·type,145 is·a·subtype·of·<code·class="inline">the_opaque(U)</code>·when·T·is·a·subtype·of·U.</p></li></ul><p><strong>When·defining·your·own·opaques,·here·are·some·recommendations:</strong></p><ul><li>Since·consumers·are·expected·to·not·rely·on·the·definition·of·the·opaque·type,
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205 ······<p·class="built-using">205 ······<p·class="built-using">
206 ········Built·using206 ········Built·using
207 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the207 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
208 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>208 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
209 ······</p>209 ······</p>
210 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>210 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
211 ····</footer>211 ····</footer>
212 ··</div>212 ··</div>
213 </main>213 </main>
214 </div>214 </div>
215 <script>215 <script>
216 ··function·mermaidLoaded()·{216 ··function·mermaidLoaded()·{
217 ····mermaid.initialize({217 ····mermaid.initialize({
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201 ··</a>201 ··</a>
202 ··<span·class="text">Sanity·check</span>202 ··<span·class="text">Sanity·check</span>
203 </h2>203 </h2>
204 <p>The·application·dependencies·can·be·checked·using·the·Erlang·shell.204 <p>The·application·dependencies·can·be·checked·using·the·Erlang·shell.
205 Application·dependencies·are·verified·among·installed·applications·by205 Application·dependencies·are·verified·among·installed·applications·by
206 <code·class="inline">otp_patch_apply</code>,·but·these·are·not·necessarily·those·actually·loaded.206 <code·class="inline">otp_patch_apply</code>,·but·these·are·not·necessarily·those·actually·loaded.
207 By·calling·<code·class="inline">system_information:sanity_check()</code>·one·can·validate207 By·calling·<code·class="inline">system_information:sanity_check()</code>·one·can·validate
208 dependencies·among·applications·actually·loaded.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">system_information</span><span·class="p">:</span><span·class="nf">sanity_check</span><span·class="p"·data-group-id="5063447613-1">(</span><span·class="p"·data-group-id="5063447613-1">)</span><span·class="p">.</span><span·class="w">208 dependencies·among·applications·actually·loaded.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">system_information</span><span·class="p">:</span><span·class="nf">sanity_check</span><span·class="p"·data-group-id="3152977914-1">(</span><span·class="p"·data-group-id="3152977914-1">)</span><span·class="p">.</span><span·class="w">
209 </span><span·class="ss">ok</span></code></pre><p>Please·take·a·look·at·the·reference·of·<a·href="../../lib/runtime_tools-2.1.1/doc/html/system_information.html#sanity_check/0"·title="">sanity_check()</a>·for·more209 </span><span·class="ss">ok</span></code></pre><p>Please·take·a·look·at·the·reference·of·<a·href="../../lib/runtime_tools-2.1.1/doc/html/system_information.html#sanity_check/0"·title="">sanity_check()</a>·for·more
210 information.</p>210 information.</p>
211 </div>211 </div>
  
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257 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>257 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
258 ······</p>258 ······</p>
259 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>259 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
260 ····</footer>260 ····</footer>
261 ··</div>261 ··</div>
262 </main>262 </main>
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264 <script>264 <script>
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311 ······</p>311 ······</p>
312 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>312 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
313 ····</footer>313 ····</footer>
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128 succeeds,·any·unbound·variables·in·the·pattern·become·bound.·If·the·matching128 succeeds,·any·unbound·variables·in·the·pattern·become·bound.·If·the·matching
129 fails,·an·exception·is·raised.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">X</span><span·class="p">.</span><span·class="w">129 fails,·an·exception·is·raised.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">X</span><span·class="p">.</span><span·class="w">
130 </span><span·class="gt">**·1:1:·variable·&#39;X&#39;·is·unbound·**</span><span·class="gp·unselectable">130 </span><span·class="gt">**·1:1:·variable·&#39;X&#39;·is·unbound·**</span><span·class="gp·unselectable">
131 2&gt;·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">.</span><span·class="w">131 2&gt;·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">.</span><span·class="w">
132 </span><span·class="mi">2</span><span·class="gp·unselectable">132 </span><span·class="mi">2</span><span·class="gp·unselectable">
133 3&gt;·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">133 3&gt;·</span><span·class="n">X</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
134 </span><span·class="mi">3</span><span·class="gp·unselectable">134 </span><span·class="mi">3</span><span·class="gp·unselectable">
135 4&gt;·</span><span·class="p"·data-group-id="1334552023-1">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="1334552023-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·179,·SHA:·7a4a88f8e3090fdeaf7f8ef96afeb43489ccd34d066bb46084a7ccbd37a1323c·...·]-2">}</span><span·class="p">.</span><span·class="w">135 4&gt;·</span><span·class="p"·data-group-id="8989928287-1">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8989928287-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·179,·SHA:·39340d895ec92cefe51e4612399286583dcc2045f6c4a5a5bc5bc04217a70c9a·...·]-2">}</span><span·class="p">.</span><span·class="w">
136 </span><span·class="gt">**·exception·error:·no·match·of·right·hand·side·value·{1,2}</span><span·class="gp·unselectable">136 </span><span·class="gt">**·exception·error:·no·match·of·right·hand·side·value·{1,2}</span><span·class="gp·unselectable">
137 5&gt;·</span><span·class="p"·data-group-id="1334552023-3">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="1334552023-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·179,·SHA:·df4233e32289087bee7a93d45ea9ac077c48d9d04779a21095b9a7bc1a7f61c0·...·]-4">}</span><span·class="p">.</span><span·class="w">137 5&gt;·</span><span·class="p"·data-group-id="8989928287-3">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="8989928287-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·179,·SHA:·ac3435cf344dd65eb01d971eecfd3ececaa9a7908bd688f83dc5d80646bef305·...·]-4">}</span><span·class="p">.</span><span·class="w">
138 </span><span·class="p"·data-group-id="1334552023-5">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="1334552023-5">}</span><span·class="gp·unselectable">138 </span><span·class="p"·data-group-id="8989928287-5">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="8989928287-5">}</span><span·class="gp·unselectable">
139 6&gt;·</span><span·class="n">Y</span><span·class="p">.</span><span·class="w">139 6&gt;·</span><span·class="n">Y</span><span·class="p">.</span><span·class="w">
140 </span><span·class="mi">3</span></code></pre>140 </span><span·class="mi">3</span></code></pre>
141 </div>141 </div>
  
142 <div·class="bottom-actions"·id="bottom-actions">142 <div·class="bottom-actions"·id="bottom-actions">
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187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
188 ······</p>188 ······</p>
189 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>189 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
190 ····</footer>190 ····</footer>
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192 </main>192 </main>
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228 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>228 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
229 ······</p>229 ······</p>
230 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>230 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
231 ····</footer>231 ····</footer>
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233 </main>233 </main>
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315 ······</p>315 ······</p>
316 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>316 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
317 ····</footer>317 ····</footer>
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122 ··<span·class="text">Records·and·Tuples</span>122 ··<span·class="text">Records·and·Tuples</span>
123 </h2>123 </h2>
124 <p>The·main·advantage·of·using·records·rather·than·tuples·is·that·fields·in·a124 <p>The·main·advantage·of·using·records·rather·than·tuples·is·that·fields·in·a
125 record·are·accessed·by·name,·whereas·fields·in·a·tuple·are·accessed·by·position.125 record·are·accessed·by·name,·whereas·fields·in·a·tuple·are·accessed·by·position.
126 To·illustrate·these·differences,·suppose·that·you·want·to·represent·a·person126 To·illustrate·these·differences,·suppose·that·you·want·to·represent·a·person
127 with·the·tuple·<code·class="inline">{Name,·Address,·Phone}</code>.</p><p>To·write·functions·that·manipulate·this·data,·remember·the·following:</p><ul><li>The·<code·class="inline">Name</code>·field·is·the·first·element·of·the·tuple.</li><li>The·<code·class="inline">Address</code>·field·is·the·second·element.</li><li>The·<code·class="inline">Phone</code>·field·is·the·third·element.</li></ul><p>For·example,·to·extract·data·from·a·variable·<code·class="inline">P</code>·that·contains·such·a·tuple,·you127 with·the·tuple·<code·class="inline">{Name,·Address,·Phone}</code>.</p><p>To·write·functions·that·manipulate·this·data,·remember·the·following:</p><ul><li>The·<code·class="inline">Name</code>·field·is·the·first·element·of·the·tuple.</li><li>The·<code·class="inline">Address</code>·field·is·the·second·element.</li><li>The·<code·class="inline">Phone</code>·field·is·the·third·element.</li></ul><p>For·example,·to·extract·data·from·a·variable·<code·class="inline">P</code>·that·contains·such·a·tuple,·you
128 can·write·the·following·code·and·then·use·pattern·matching·to·extract·the128 can·write·the·following·code·and·then·use·pattern·matching·to·extract·the
129 relevant·fields:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="6386899699-1">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><span·class="p"·data-group-id="6386899699-1">)</span><span·class="p">,</span><span·class="w">129 relevant·fields:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="0569369880-1">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><span·class="p"·data-group-id="0569369880-1">)</span><span·class="p">,</span><span·class="w">
130 </span><span·class="n">Address</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="6386899699-2">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><span·class="p"·data-group-id="6386899699-2">)</span><span·class="p">,</span><span·class="w">130 </span><span·class="n">Address</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="0569369880-2">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><span·class="p"·data-group-id="0569369880-2">)</span><span·class="p">,</span><span·class="w">
131 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Such·code·is·difficult·to·read·and·understand,·and·errors·occur·if·the·numbering131 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Such·code·is·difficult·to·read·and·understand,·and·errors·occur·if·the·numbering
132 of·the·elements·in·the·tuple·is·wrong.·If·the·data·representation·of·the·fields132 of·the·elements·in·the·tuple·is·wrong.·If·the·data·representation·of·the·fields
133 is·changed,·by·re-ordering,·adding,·or·removing·fields,·all·references·to·the133 is·changed,·by·re-ordering,·adding,·or·removing·fields,·all·references·to·the
134 person·tuple·must·be·checked·and·possibly·modified.</p><p>Records·allow·references·to·the·fields·by·name,·instead·of·by·position.·In·the134 person·tuple·must·be·checked·and·possibly·modified.</p><p>Records·allow·references·to·the·fields·by·name,·instead·of·by·position.·In·the
135 following·example,·a·record·instead·of·a·tuple·is·used·to·store·the·data:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="2771930329-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2771930329-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·3546fac620ea89ff302c5b90b5dd6f02694f84665e85c9200094ff7a22e574eb·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·enables·references·to·the·fields·of·the·record·by·name.·For·example,·if·<code·class="inline">P</code>135 following·example,·a·record·instead·of·a·tuple·is·used·to·store·the·data:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="4474741662-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4474741662-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·5648757eb8d8ea72bcdf11ac2e7ef7480ff2045cdb564a100ac14a524a71da06·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·enables·references·to·the·fields·of·the·record·by·name.·For·example,·if·<code·class="inline">P</code>
136 is·a·variable·whose·value·is·a·<code·class="inline">person</code>·record,·the·following·code·access·the136 is·a·variable·whose·value·is·a·<code·class="inline">person</code>·record,·the·following·code·access·the
137 name·and·address·fields·of·the·records:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">137 name·and·address·fields·of·the·records:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">
138 </span><span·class="n">Address</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">address</span><span·class="p">,</span><span·class="w">138 </span><span·class="n">Address</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">address</span><span·class="p">,</span><span·class="w">
139 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Internally,·records·are·represented·using·tagged·tuples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0131065541-1">{</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Phone</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·66,·SHA:·347470756f73572f56b6432e48ac85e2887ca7edf3dfc29965041146229e3fe2·...·]-1">}</span></code></pre><h2·id="defining-a-record"·class="section-heading">139 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Internally,·records·are·represented·using·tagged·tuples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5259165329-1">{</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Phone</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·66,·SHA:·48bc59bbae284d6265838de4d56228376b427ab4cef2c11d865cffeb7dbaceed·...·]-1">}</span></code></pre><h2·id="defining-a-record"·class="section-heading">
140 ··<a·href="#defining-a-record"·class="hover-link">140 ··<a·href="#defining-a-record"·class="hover-link">
141 ····<i·class="ri-link-m"·aria-hidden="true"></i>141 ····<i·class="ri-link-m"·aria-hidden="true"></i>
142 ··</a>142 ··</a>
143 ··<span·class="text">Defining·a·Record</span>143 ··<span·class="text">Defining·a·Record</span>
144 </h2>144 </h2>
145 <p>This·following·definition·of·a·<code·class="inline">person</code>·is·used·in·several·examples·in·this145 <p>This·following·definition·of·a·<code·class="inline">person</code>·is·used·in·several·examples·in·this
146 section.·Three·fields·are·included,·<code·class="inline">name</code>,·<code·class="inline">phone</code>,·and·<code·class="inline">address</code>.·The·default146 section.·Three·fields·are·included,·<code·class="inline">name</code>,·<code·class="inline">phone</code>,·and·<code·class="inline">address</code>.·The·default
147 values·for·<code·class="inline">name</code>·and·<code·class="inline">phone</code>·is·&quot;&quot;·and·[],·respectively.·The·default·value·for147 values·for·<code·class="inline">name</code>·and·<code·class="inline">phone</code>·is·&quot;&quot;·and·[],·respectively.·The·default·value·for
148 <code·class="inline">address</code>·is·the·atom·<code·class="inline">undefined</code>,·since·no·default·value·is·supplied·for·this148 <code·class="inline">address</code>·is·the·atom·<code·class="inline">undefined</code>,·since·no·default·value·is·supplied·for·this
149 field:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="2970532751-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2970532751-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2970532751-3">[</span><span·class="p"·data-group-id="2970532751-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">address</span><span·class="p"·data-group-id="2970532751-2">}</span><span·class="p"·data-group-id="2970532751-1">)</span><span·class="p">.</span></code></pre><p>The·record·must·be·defined·in·the·shell·to·enable·use·of·the·record·syntax·in 
150 the·examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">rd</span><span·class="p"·data-group-id="1257269321-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·676,·SHA:·a9ca6277425c7ea90542d1b993ee51002167345888fe8e95cde27ef7683a438c·...·]149 field:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="9240606728-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·732,·SHA:·604a97331c61a0f153745f224e286d641bf3e02b1cd662f7849ee3701d5056c4·...·]
 150 the·examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">rd</span><span·class="p"·data-group-id="5779640099-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5779640099-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5779640099-3">[</span><span·class="p"·data-group-id="5779640099-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">address</span><span·class="p"·data-group-id="5779640099-2">}</span><span·class="p"·data-group-id="5779640099-1">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="ss">person</span></code></pre><p>This·is·because·record·definitions·are·only·available·at·compile·time,·not·at151 </span><span·class="ss">person</span></code></pre><p>This·is·because·record·definitions·are·only·available·at·compile·time,·not·at
152 runtime.·For·details·on·records·in·the·shell,·see·the·<a·href="../../lib/stdlib-6.2.2/doc/html/shell.html"><code·class="inline">shell</code></a>·manual·page·in152 runtime.·For·details·on·records·in·the·shell,·see·the·<a·href="../../lib/stdlib-6.2.2/doc/html/shell.html"><code·class="inline">shell</code></a>·manual·page·in
153 STDLIB.</p><h2·id="creating-a-record"·class="section-heading">153 STDLIB.</p><h2·id="creating-a-record"·class="section-heading">
154 ··<a·href="#creating-a-record"·class="hover-link">154 ··<a·href="#creating-a-record"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">Creating·a·Record</span>157 ··<span·class="text">Creating·a·Record</span>
158 </h2>158 </h2>
159 <p>A·new·<code·class="inline">person</code>·record·is·created·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8987649711-1">{</span><span·class="ss">phone</span><span·class="o">=</span><span·class="p"·data-group-id="8987649711-2">[</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">2</span><span·[·...·truncated·by·diffoscope;·len:·474,·SHA:·7ddc4dc41cce22dc8df94a1b41c84cf52d228cc702c7cc171e7f7aedf83795de·...·]-1">}</span><span·class="p">.</span><span·class="w">159 <p>A·new·<code·class="inline">person</code>·record·is·created·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8613891164-1">{</span><span·class="ss">phone</span><span·class="o">=</span><span·class="p"·data-group-id="8613891164-2">[</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">2</span><span·[·...·truncated·by·diffoscope;·len:·474,·SHA:·0c6608e3f49a012bf455ed90023a39fa787739afb25abcc2b519a2248a55de8e·...·]-1">}</span><span·class="p">.</span><span·class="w">
160 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8987649711-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Robert&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=[·...·truncated·by·diffoscope;·len:·706,·SHA:·43b85e6a111b2422525da469244183dd20bc7ddf74d1b604097d7694b7754578·...·]-3">}</span></code></pre><p>As·the·<code·class="inline">address</code>·field·was·omitted,·its·default·value·is·used.</p><p>From·Erlang·5.1/OTP·R8B,·a·value·to·all·fields·in·a·record·can·be·set·with·the160 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8613891164-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Robert&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=[·...·truncated·by·diffoscope;·len:·706,·SHA:·a2ed0faea52d22d954f0c2b0bed446c3f8a82d57e0c8d9214e11a759c12ca576·...·]-3">}</span></code></pre><p>As·the·<code·class="inline">address</code>·field·was·omitted,·its·default·value·is·used.</p><p>From·Erlang·5.1/OTP·R8B,·a·value·to·all·fields·in·a·record·can·be·set·with·the
161 special·field·<code·class="inline">_</code>.·<code·class="inline">_</code>·means·&quot;all·fields·not·explicitly·specified&quot;.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="7368345531-1">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Jakob&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·126,·SHA:·1c88006393167aca1ab319e6d73ffcd14a1a1cc431e50f8cb356ef4e8aa0e838·...·]-1">}</span><span·class="p">.</span><span·class="w">161 special·field·<code·class="inline">_</code>.·<code·class="inline">_</code>·means·&quot;all·fields·not·explicitly·specified&quot;.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8798249533-1">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Jakob&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·126,·SHA:·4ecddf77b25dd418f9df2e46facb0eca8e65280c4c7ad869c50266ed5f77fa4b·...·]-1">}</span><span·class="p">.</span><span·class="w">
162 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="7368345531-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Jakob&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=[·...·truncated·by·diffoscope;·len:·269,·SHA:·3820c4f47cc352d9b93f2ac37cc207e34c6f4f346f5dfc0a79b17c0e91cd31c2·...·]-2">}</span></code></pre><p>It·is·primarily·intended·to·be·used·in·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#match/2"><code·class="inline">ets:match/2</code></a>·and162 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8798249533-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Jakob&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=[·...·truncated·by·diffoscope;·len:·269,·SHA:·e47bc3b0eb79920450766a8414da73db78d9dcbd1e99d5774e0f52b54d199d06·...·]-2">}</span></code></pre><p>It·is·primarily·intended·to·be·used·in·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#match/2"><code·class="inline">ets:match/2</code></a>·and
163 <a·href="../../lib/mnesia-4.23.5/doc/html/mnesia.html#match_object/3"><code·class="inline">mnesia:match_object/3</code></a>,·to·set·record·fields·to·the·atom·<code·class="inline">'_'</code>.·(This·is·a163 <a·href="../../lib/mnesia-4.23.5/doc/html/mnesia.html#match_object/3"><code·class="inline">mnesia:match_object/3</code></a>,·to·set·record·fields·to·the·atom·<code·class="inline">'_'</code>.·(This·is·a
164 wildcard·in·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#match/2"><code·class="inline">ets:match/2</code></a>.)</p><h2·id="accessing-a-record-field"·class="section-heading">164 wildcard·in·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#match/2"><code·class="inline">ets:match/2</code></a>.)</p><h2·id="accessing-a-record-field"·class="section-heading">
165 ··<a·href="#accessing-a-record-field"·class="hover-link">165 ··<a·href="#accessing-a-record-field"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">Accessing·a·Record·Field</span>168 ··<span·class="text">Accessing·a·Record·Field</span>
169 </h2>169 </h2>
170 <p>The·following·example·shows·how·to·access·a·record·field:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="7548863353-1">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·568,·SHA:·55151557ec1471642d2fd454f4ecdb5438694a0654a77fcd210a1eec44e0d81e·...·]-1">}</span><span·class="p">.</span><span·class="w">170 <p>The·following·example·shows·how·to·access·a·record·field:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="9754371572-1">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·568,·SHA:·52fe6b04c16e502ad09c677ff8758d186402cf3b4433f3cf13a8c5918d73d797·...·]-1">}</span><span·class="p">.</span><span·class="w">
171 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="7548863353-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</[·...·truncated·by·diffoscope;·len:·704,·SHA:·59935b4714884c34744ad583bdf4dae6bee865cb61e9e948c65c8192b2bca44e·...·]-3">}</span><span·class="gp·unselectable">171 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="9754371572-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</[·...·truncated·by·diffoscope;·len:·704,·SHA:·c91dd4e40d99c6eab375f545ed02a0b6ad3daab8af8569885822ca6daa869a60·...·]-3">}</span><span·class="gp·unselectable">
172 &gt;·</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">.</span><span·class="w">172 &gt;·</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">.</span><span·class="w">
173 </span><span·class="s">&quot;Joe&quot;</span></code></pre><h2·id="updating-a-record"·class="section-heading">173 </span><span·class="s">&quot;Joe&quot;</span></code></pre><h2·id="updating-a-record"·class="section-heading">
174 ··<a·href="#updating-a-record"·class="hover-link">174 ··<a·href="#updating-a-record"·class="hover-link">
175 ····<i·class="ri-link-m"·aria-hidden="true"></i>175 ····<i·class="ri-link-m"·aria-hidden="true"></i>
176 ··</a>176 ··</a>
177 ··<span·class="text">Updating·a·Record</span>177 ··<span·class="text">Updating·a·Record</span>
178 </h2>178 </h2>
179 <p>The·following·example·shows·how·to·update·a·record:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">P1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6997246159-1">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="o">=</span><span·class="p"·data-group-id="6997246159-2">[·...·truncated·by·diffoscope;·len:·371,·SHA:·0aed1ad21791656d1988c9e75d76ba31ef5b8d4f209454c249f84e0e91d8c641·...·]-1">}</span><span·class="p">.</span><span·class="w">179 <p>The·following·example·shows·how·to·update·a·record:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">P1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6979138018-1">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="o">=</span><span·class="p"·data-group-id="6979138018-2">[·...·truncated·by·diffoscope;·len:·371,·SHA:·054f3e1a1d878645c38e510a171cd90891aef300c62b02fd18b9134cc40e622c·...·]-1">}</span><span·class="p">.</span><span·class="w">
180 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6997246159-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</sp[·...·truncated·by·diffoscope;·len:·467,·SHA:·5cea566a24df2d828dde7ba639106e2c9c9f34df145cb84ebb086406391be950·...·]-3">}</span><span·class="gp·unselectable">180 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6979138018-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</sp[·...·truncated·by·diffoscope;·len:·467,·SHA:·b6532074f8905927b001b413285cd31689bdb4b18e74ec9f01678fbff38f8391·...·]-3">}</span><span·class="gp·unselectable">
181 &gt;·</span><span·class="n">P2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P1</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6997246159-5">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Robert&quot;</span><span·class="p"·data-group-id="6997246159-5">}</span><span·class="p">.</span><span·class="w">181 &gt;·</span><span·class="n">P2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P1</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6979138018-5">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Robert&quot;</span><span·class="p"·data-group-id="6979138018-5">}</span><span·class="p">.</span><span·class="w">
182 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6997246159-6">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Robert&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=<[·...·truncated·by·diffoscope;·len:·470,·SHA:·6d25b47511c4371beaa598db116aaeafd4f810d028721121222c9602fc2e3348·...·]-6">}</span></code></pre><h2·id="type-testing"·class="section-heading">182 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6979138018-6">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Robert&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=<[·...·truncated·by·diffoscope;·len:·470,·SHA:·30d4221bace5081bd12944df37e59e24b18cbf5b9297ef1a383791a08b8bff3a·...·]-6">}</span></code></pre><h2·id="type-testing"·class="section-heading">
183 ··<a·href="#type-testing"·class="hover-link">183 ··<a·href="#type-testing"·class="hover-link">
184 ····<i·class="ri-link-m"·aria-hidden="true"></i>184 ····<i·class="ri-link-m"·aria-hidden="true"></i>
185 ··</a>185 ··</a>
186 ··<span·class="text">Type·Testing</span>186 ··<span·class="text">Type·Testing</span>
187 </h2>187 </h2>
188 <p>The·following·example·shows·that·the·guard·succeeds·if·<code·class="inline">P</code>·is·record·of·type188 <p>The·following·example·shows·that·the·guard·succeeds·if·<code·class="inline">P</code>·is·record·of·type
189 <code·class="inline">person</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="0920562777-1">(</span><span·class="n">P</span><span·class="p"·data-group-id="0920562777-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="0920562777-2">(</s[·...·truncated·by·diffoscope;·len:·147,·SHA:·070b2a6d03f5fb33c756e226766d396881913774eb47fd86b3ceb909d31aefeb·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">a_person</span><span·class="p">;</span><span·class="w">189 <code·class="inline">person</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="1340080676-1">(</span><span·class="n">P</span><span·class="p"·data-group-id="1340080676-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="1340080676-2">(</s[·...·truncated·by·diffoscope;·len:·147,·SHA:·2c38198c8fe412989bdcc370226af6f380b81f4c946648829160de5cc2ba16f9·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">a_person</span><span·class="p">;</span><span·class="w">
190 </span><span·class="nf">foo</span><span·class="p"·data-group-id="0920562777-3">(</span><span·class="p">_</span><span·class="p"·data-group-id="0920562777-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">not_a_person</span><span·class="p">.</span></code></pre><h2·id="pattern-matching"·class="section-heading">190 </span><span·class="nf">foo</span><span·class="p"·data-group-id="1340080676-3">(</span><span·class="p">_</span><span·class="p"·data-group-id="1340080676-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">not_a_person</span><span·class="p">.</span></code></pre><h2·id="pattern-matching"·class="section-heading">
191 ··<a·href="#pattern-matching"·class="hover-link">191 ··<a·href="#pattern-matching"·class="hover-link">
192 ····<i·class="ri-link-m"·aria-hidden="true"></i>192 ····<i·class="ri-link-m"·aria-hidden="true"></i>
193 ··</a>193 ··</a>
194 ··<span·class="text">Pattern·Matching</span>194 ··<span·class="text">Pattern·Matching</span>
195 </h2>195 </h2>
196 <p>Matching·can·be·used·in·combination·with·records,·as·shown·in·the·following196 <p>Matching·can·be·used·in·combination·with·records,·as·shown·in·the·following
197 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">P3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="2007281842-1">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="o">=</span><span·class="p"·data-group-id="2007281842-2[·...·truncated·by·diffoscope;·len:·372,·SHA:·76a5b52e7332882b5a748ba3177f59464eb5f3f1ee91c80d47345abaf9e6fd47·...·]2-1">}</span><span·class="p">.</span><span·class="w">197 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">P3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="3140888502-1">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span><span·class="o">=</span><span·class="p"·data-group-id="3140888502-2[·...·truncated·by·diffoscope;·len:·372,·SHA:·4b583b188a8be2b7d8210221b3cf742cd630d7359de82151eeddccf50465d0c3·...·]2-1">}</span><span·class="p">.</span><span·class="w">
198 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="2007281842-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</[·...·truncated·by·diffoscope;·len:·468,·SHA:·df1f4d60bacdf0f5dcc736573face03033ff85057250777358b8a8e0423bb284·...·]2-3">}</span><span·class="gp·unselectable">198 </span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="3140888502-3">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Joe&quot;</span><span·class="p">,</span><span·class="ss">phone</span><span·class="w">·</span><span·class="o">=</[·...·truncated·by·diffoscope;·len:·468,·SHA:·c95e7f37e87bbe27ea071bdfd8a3fa229a1ee9e507f1ff941d2895527dda2c1d·...·]2-3">}</span><span·class="gp·unselectable">
199 &gt;·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="2007281842-5">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="2007281842-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">.</span><span·class="w">199 &gt;·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="3140888502-5">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="3140888502-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">.</span><span·class="w">
200 </span><span·class="s">&quot;Joe&quot;</span></code></pre><p>The·following·function·takes·a·list·of·<code·class="inline">person</code>·records·and·searches·for·the200 </span><span·class="s">&quot;Joe&quot;</span></code></pre><p>The·following·function·takes·a·list·of·<code·class="inline">person</code>·records·and·searches·for·the
201 phone·number·of·a·person·with·a·particular·name:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">find_phone</span><span·class="p"·data-group-id="6386627707-1">(</span><span·class="p"·data-group-id="6386627707-2">[</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6386627707-3">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="n">Name</[·...·truncated·by·diffoscope;·len:·452,·SHA:·6fb5d847519772e643a22cc082701d19353e09f889274749b45a47919264db74·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">201 phone·number·of·a·person·with·a·particular·name:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">find_phone</span><span·class="p"·data-group-id="2976765472-1">(</span><span·class="p"·data-group-id="2976765472-2">[</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="2976765472-3">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="n">Name</[·...·truncated·by·diffoscope;·len:·452,·SHA:·e0d8d3c5f7cf5821471da8956e9e0640c210c9b9262690139e8d361bd1f40ab2·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
202 ····</span><span·class="p"·data-group-id="6386627707-4">{</span><span·class="ss">found</span><span·class="p">,</span><span·class="w">··</span><span·class="n">Phone</span><span·class="p"·data-group-id="6386627707-4">}</span><span·class="p">;</span><span·class="w">202 ····</span><span·class="p"·data-group-id="2976765472-4">{</span><span·class="ss">found</span><span·class="p">,</span><span·class="w">··</span><span·class="n">Phone</span><span·class="p"·data-group-id="2976765472-4">}</span><span·class="p">;</span><span·class="w">
203 </span><span·class="nf">find_phone</span><span·class="p"·data-group-id="6386627707-5">(</span><span·class="p"·data-group-id="6386627707-6">[</span><span·class="p">_</span><span·class="p">|</span><span·class="w">·</span><span·class="n">T</span><span·class="p"·data-group-id="6386627707-6">]</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·84,·SHA:·882134734198c9dfca5a97ca6ec5ff0611b496a3fac1f5b1d11f11410d05a86b·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">203 </span><span·class="nf">find_phone</span><span·class="p"·data-group-id="2976765472-5">(</span><span·class="p"·data-group-id="2976765472-6">[</span><span·class="p">_</span><span·class="p">|</span><span·class="w">·</span><span·class="n">T</span><span·class="p"·data-group-id="2976765472-6">]</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·84,·SHA:·945bfa75512172cc2b54704d6bb6b0e2bd6d08935b43e1db9a4d242cf9c71234·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
204 ····</span><span·class="nf">find_phone</span><span·class="p"·data-group-id="6386627707-7">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="6386627707-7">)</span><span·class="p">;</span><span·class="w">204 ····</span><span·class="nf">find_phone</span><span·class="p"·data-group-id="2976765472-7">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="2976765472-7">)</span><span·class="p">;</span><span·class="w">
205 </span><span·class="nf">find_phone</span><span·class="p"·data-group-id="6386627707-8">(</span><span·class="p"·data-group-id="6386627707-9">[</span><span·class="p"·data-group-id="6386627707-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="6386627707-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 </span><span·class="nf">find_phone</span><span·class="p"·data-group-id="2976765472-8">(</span><span·class="p"·data-group-id="2976765472-9">[</span><span·class="p"·data-group-id="2976765472-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="2976765472-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 ····</span><span·class="ss">not_found</span><span·class="p">.</span></code></pre><p>The·fields·referred·to·in·the·pattern·can·be·given·in·any·order.</p><h2·id="nested-records"·class="section-heading">206 ····</span><span·class="ss">not_found</span><span·class="p">.</span></code></pre><p>The·fields·referred·to·in·the·pattern·can·be·given·in·any·order.</p><h2·id="nested-records"·class="section-heading">
207 ··<a·href="#nested-records"·class="hover-link">207 ··<a·href="#nested-records"·class="hover-link">
208 ····<i·class="ri-link-m"·aria-hidden="true"></i>208 ····<i·class="ri-link-m"·aria-hidden="true"></i>
209 ··</a>209 ··</a>
210 ··<span·class="text">Nested·Records</span>210 ··<span·class="text">Nested·Records</span>
211 </h2>211 </h2>
212 <p>The·value·of·a·field·in·a·record·can·be·an·instance·of·a·record.·Retrieval·of212 <p>The·value·of·a·field·in·a·record·can·be·an·instance·of·a·record.·Retrieval·of
213 nested·data·can·be·done·stepwise,·or·in·a·single·step,·as·shown·in·the·following213 nested·data·can·be·done·stepwise,·or·in·a·single·step,·as·shown·in·the·following
214 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5926860907-1">(</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5926860907-2">{</span><span·class="ss">first</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·321,·SHA:·ab0fd24afe89daf833646130032fd6d14d1723b60248826431a0357cb76f30ab·...·]-1">)</span><span·class="p">.</span><span·class="w">214 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5805576834-1">(</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5805576834-2">{</span><span·class="ss">first</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·321,·SHA:·f7f0c8581dd74670b0919eca82583c6a8877d8dee9c59fb38137d6be419c7d23·...·]-1">)</span><span·class="p">.</span><span·class="w">
215 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5926860907-3">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5926860907-4">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·325,·SHA:·7130f2aac73a05fc169aee3a6bbc2a61b79350d0ceed2f8f5211a226c53af352·...·]-3">)</span><span·class="p">.</span><span·class="w">215 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5805576834-3">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5805576834-4">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·325,·SHA:·e1018a067c5341c7517ea9b68ccae47538af6c8b748bf3cd0fcf28a64241c483·...·]-3">)</span><span·class="p">.</span><span·class="w">
  
216 </span><span·class="nf">demo</span><span·class="p"·data-group-id="5926860907-6">(</span><span·class="p"·data-group-id="5926860907-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">216 </span><span·class="nf">demo</span><span·class="p"·data-group-id="5805576834-6">(</span><span·class="p"·data-group-id="5805576834-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
217 ··</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="5926860907-7">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">name</span><span·class="p"·data-group-id="5926860907-8">{</span><span·class="ss">first</span><span·class="o">=</span><[·...·truncated·by·diffoscope;·len:·380,·SHA:·da7c29ce529caf14905528867989590f1edf57421370d1cfef0ccd125e8eee64·...·]-7">}</span><span·class="p">,</span><span·class="w">217 ··</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="5805576834-7">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">name</span><span·class="p"·data-group-id="5805576834-8">{</span><span·class="ss">first</span><span·class="o">=</span><[·...·truncated·by·diffoscope;·len:·380,·SHA:·aa165f317967439bf5a7e21ff04ec0344d6c2d1d5e3c046727d26013f4be5036·...·]-7">}</span><span·class="p">,</span><span·class="w">
218 ··</span><span·class="n">First</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5926860907-9">(</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p"·data-group-id="5926860907-9">)</span><span·class="o">#</span><span·class="ss">name</span><span·class="p">.</span><span·class="ss">first</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">demo()</code>·evaluates·to·<code·class="inline">&quot;Robert&quot;</code>.</p><h2·id="a-longer-example"·class="section-heading">218 ··</span><span·class="n">First</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5805576834-9">(</span><span·class="n">P</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p"·data-group-id="5805576834-9">)</span><span·class="o">#</span><span·class="ss">name</span><span·class="p">.</span><span·class="ss">first</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">demo()</code>·evaluates·to·<code·class="inline">&quot;Robert&quot;</code>.</p><h2·id="a-longer-example"·class="section-heading">
219 ··<a·href="#a-longer-example"·class="hover-link">219 ··<a·href="#a-longer-example"·class="hover-link">
220 ····<i·class="ri-link-m"·aria-hidden="true"></i>220 ····<i·class="ri-link-m"·aria-hidden="true"></i>
221 ··</a>221 ··</a>
222 ··<span·class="text">A·Longer·Example</span>222 ··<span·class="text">A·Longer·Example</span>
223 </h2>223 </h2>
224 <p>Comments·are·embedded·in·the·following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·File:·person.hrl</span><span·class="w">224 <p>Comments·are·embedded·in·the·following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·File:·person.hrl</span><span·class="w">
  
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230 </span><span·class="c1">%%····name:··A·string·(default·is·undefined).</span><span·class="w">230 </span><span·class="c1">%%····name:··A·string·(default·is·undefined).</span><span·class="w">
231 </span><span·class="c1">%%····age:···An·integer·(default·is·undefined).</span><span·class="w">231 </span><span·class="c1">%%····age:···An·integer·(default·is·undefined).</span><span·class="w">
232 </span><span·class="c1">%%····phone:·A·list·of·integers·(default·is·[]).</span><span·class="w">232 </span><span·class="c1">%%····phone:·A·list·of·integers·(default·is·[]).</span><span·class="w">
233 </span><span·class="c1">%%····dict:··A·dictionary·containing·various·information</span><span·class="w">233 </span><span·class="c1">%%····dict:··A·dictionary·containing·various·information</span><span·class="w">
234 </span><span·class="c1">%%···········about·the·person.</span><span·class="w">234 </span><span·class="c1">%%···········about·the·person.</span><span·class="w">
235 </span><span·class="c1">%%···········A·{Key,·Value}·list·(default·is·the·empty·list).</span><span·class="w">235 </span><span·class="c1">%%···········A·{Key,·Value}·list·(default·is·the·empty·list).</span><span·class="w">
236 </span><span·class="c1">%%------------------------------------------------------------</span><span·class="w">236 </span><span·class="c1">%%------------------------------------------------------------</span><span·class="w">
237 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0013897020-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0013897020-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">age</span>[·...·truncated·by·diffoscope;·len:·878,·SHA:·5ad5d90df293325b85850e8718f35a13a54b93453fe5579658173cb9ea78bca1·...·]-1">)</span><span·class="p">.</span><span·class="w">237 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8525967923-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8525967923-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">age</span>[·...·truncated·by·diffoscope;·len:·878,·SHA:·78ce2e87a332c129a854613b53535eb1ffcfbb68812742d2d971b0871b62bf31·...·]-1">)</span><span·class="p">.</span><span·class="w">
238 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="9408891542-2">(</span><span·class="s">&quot;person.hrl&quot;</span><span·class="p"·data-group-id="9408891542-2">)</span><span·class="p">.</span><span·class="w">238 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="4839720686-2">(</span><span·class="s">&quot;person.hrl&quot;</span><span·class="p"·data-group-id="4839720686-2">)</span><span·class="p">.</span><span·class="w">
239 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="9408891542-3">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="9408891542-3">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·For·test·purposes·only.</span><span·class="w">239 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="4839720686-3">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="4839720686-3">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·For·test·purposes·only.</span><span·class="w">
  
240 </span><span·class="c1">%%·This·creates·an·instance·of·a·person.</span><span·class="w">240 </span><span·class="c1">%%·This·creates·an·instance·of·a·person.</span><span·class="w">
241 </span><span·class="c1">%%···Note:·The·phone·number·is·not·supplied·so·the</span><span·class="w">241 </span><span·class="c1">%%···Note:·The·phone·number·is·not·supplied·so·the</span><span·class="w">
242 </span><span·class="c1">%%·········default·value·[]·will·be·used.</span><span·class="w">242 </span><span·class="c1">%%·········default·value·[]·will·be·used.</span><span·class="w">
  
243 </span><span·class="nf">make_hacker_without_phone</span><span·class="p"·data-group-id="9408891542-4">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Age</span><span·class="p"·data-group-id="9408891542-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">243 </span><span·class="nf">make_hacker_without_phone</span><span·class="p"·data-group-id="4839720686-4">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Age</span><span·class="p"·data-group-id="4839720686-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
244 ···</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="9408891542-5">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">age</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Age</span><span·class="p">,</span><span·class="w">244 ···</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="4839720686-5">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">age</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Age</span><span·class="p">,</span><span·class="w">
245 ···········</span><span·class="ss">dict</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9408891542-6">[</span><span·class="p"·data-group-id="9408891542-7">{</span><span·class="ss">computer_knowledge</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">excellent</span><span·class="p"·data-group-id="9408891542-7">}</span><span·class="p">,</span><span·class="w">245 ···········</span><span·class="ss">dict</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4839720686-6">[</span><span·class="p"·data-group-id="4839720686-7">{</span><span·class="ss">computer_knowledge</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">excellent</span><span·class="p"·data-group-id="4839720686-7">}</span><span·class="p">,</span><span·class="w">
246 ···················</span><span·class="p"·data-group-id="9408891542-8">{</span><span·class="ss">drinks</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coke</span><span·class="p"·data-group-id="9408891542-8">}</span><span·class="p"·data-group-id="9408891542-6">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·60adfa3616dd3aabf9f8de83318aee77e1daab4f4c3f57ebb62bba6faff0c0fc·...·]-5">}</span><span·class="p">.</span><span·class="w">246 ···················</span><span·class="p"·data-group-id="4839720686-8">{</span><span·class="ss">drinks</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coke</span><span·class="p"·data-group-id="4839720686-8">}</span><span·class="p"·data-group-id="4839720686-6">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·4a21afbd01506d9763218ec1deb21bda8700ca83326f4f78e325708e57172f28·...·]-5">}</span><span·class="p">.</span><span·class="w">
  
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163 ······<p·class="built-using">163 ······<p·class="built-using">
164 ········Built·using164 ········Built·using
165 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the165 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
166 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>166 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
167 ······</p>167 ······</p>
168 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>168 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
169 ····</footer>169 ····</footer>
170 ··</div>170 ··</div>
171 </main>171 </main>
172 </div>172 </div>
173 <script>173 <script>
174 ··function·mermaidLoaded()·{174 ··function·mermaidLoaded()·{
175 ····mermaid.initialize({175 ····mermaid.initialize({
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165 ······<p·class="built-using">165 ······<p·class="built-using">
166 ········Built·using166 ········Built·using
167 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the167 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
168 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>168 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
169 ······</p>169 ······</p>
170 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>170 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
171 ····</footer>171 ····</footer>
172 ··</div>172 ··</div>
173 </main>173 </main>
174 </div>174 </div>
175 <script>175 <script>
176 ··function·mermaidLoaded()·{176 ··function·mermaidLoaded()·{
177 ····mermaid.initialize({177 ····mermaid.initialize({
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124 </h2>124 </h2>
125 <p>To·illustrate·this,·the·messenger·example·from·the·previous·section·is·divided125 <p>To·illustrate·this,·the·messenger·example·from·the·previous·section·is·divided
126 into·the·following·five·files:</p><ul><li><p><code·class="inline">mess_config.hrl</code></p><p>Header·file·for·configuration·data</p></li><li><p><code·class="inline">mess_interface.hrl</code></p><p>Interface·definitions·between·the·client·and·the·messenger</p></li><li><p><code·class="inline">user_interface.erl</code></p><p>Functions·for·the·user·interface</p></li><li><p><code·class="inline">mess_client.erl</code></p><p>Functions·for·the·client·side·of·the·messenger</p></li><li><p><code·class="inline">mess_server.erl</code></p><p>Functions·for·the·server·side·of·the·messenger</p></li></ul><p>While·doing·this,·the·message·passing·interface·between·the·shell,·the·client,126 into·the·following·five·files:</p><ul><li><p><code·class="inline">mess_config.hrl</code></p><p>Header·file·for·configuration·data</p></li><li><p><code·class="inline">mess_interface.hrl</code></p><p>Interface·definitions·between·the·client·and·the·messenger</p></li><li><p><code·class="inline">user_interface.erl</code></p><p>Functions·for·the·user·interface</p></li><li><p><code·class="inline">mess_client.erl</code></p><p>Functions·for·the·client·side·of·the·messenger</p></li><li><p><code·class="inline">mess_server.erl</code></p><p>Functions·for·the·server·side·of·the·messenger</p></li></ul><p>While·doing·this,·the·message·passing·interface·between·the·shell,·the·client,
127 and·the·server·is·cleaned·up·and·is·defined·using·<em>records</em>.·Also,·<em>macros</em>·are127 and·the·server·is·cleaned·up·and·is·defined·using·<em>records</em>.·Also,·<em>macros</em>·are
128 introduced:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_config.hrl----</span><span·class="w">128 introduced:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_config.hrl----</span><span·class="w">
  
129 </span><span·class="c1">%%%·Configure·the·location·of·the·server·node,</span><span·class="w">129 </span><span·class="c1">%%%·Configure·the·location·of·the·server·node,</span><span·class="w">
130 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4265889304-1">(</span><span·class="ss">server_node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">messenger@super</span><span·class="p"·data-group-id="4265889304-1">)</span><span·class="p">.</span><span·class="w">130 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5853683621-1">(</span><span·class="ss">server_node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">messenger@super</span><span·class="p"·data-group-id="5853683621-1">)</span><span·class="p">.</span><span·class="w">
  
131 </span><span·class="c1">%%%----END·FILE----</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_interface.hrl----</span><span·class="w">131 </span><span·class="c1">%%%----END·FILE----</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_interface.hrl----</span><span·class="w">
  
132 </span><span·class="c1">%%%·Message·interface·between·client·and·server·and·client·shell·for</span><span·class="w">132 </span><span·class="c1">%%%·Message·interface·between·client·and·server·and·client·shell·for</span><span·class="w">
133 </span><span·class="c1">%%%·messenger·program</span><span·class="w">133 </span><span·class="c1">%%%·messenger·program</span><span·class="w">
  
134 </span><span·class="c1">%%%Messages·from·Client·to·server·received·in·server/1·function.</span><span·class="w">134 </span><span·class="c1">%%%Messages·from·Client·to·server·received·in·server/1·function.</span><span·class="w">
135 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546639905-1">(</span><span·class="ss">logon</span><span·class="p">,</span><span·class="p"·data-group-id="8546639905-2">{</span><span·class="ss">client_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">username</span><span·class="p[·...·truncated·by·diffoscope;·len:·78,·SHA:·48690a7be38603df53d243ef2160ac86683a3b79e4da54c02678524feac28b65·...·]05-1">)</span><span·class="p">.</span><span·class="w">135 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0989777705-1">(</span><span·class="ss">logon</span><span·class="p">,</span><span·class="p"·data-group-id="0989777705-2">{</span><span·class="ss">client_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">username</span><span·class="p[·...·truncated·by·diffoscope;·len:·78,·SHA:·b3e024e337929ff984b68c045e6d8103d1cbba1da4b51cec837a1a9bad323e6f·...·]05-1">)</span><span·class="p">.</span><span·class="w">
136 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546639905-3">(</span><span·class="ss">message</span><span·class="p">,</span><span·class="p"·data-group-id="8546639905-4">{</span><span·class="ss">client_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">to_name</span><span·class="[·...·truncated·by·diffoscope;·len:·158,·SHA:·df2caee1a25f66b8d259de98ef4b314c5f9d4911eb81bb2eaebf1eaa9605eece·...·]05-3">)</span><span·class="p">.</span><span·class="w">136 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0989777705-3">(</span><span·class="ss">message</span><span·class="p">,</span><span·class="p"·data-group-id="0989777705-4">{</span><span·class="ss">client_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">to_name</span><span·class="[·...·truncated·by·diffoscope;·len:·158,·SHA:·99f81a5c6cc2cf746590a97e3e424f4f48849d2c1343ea3eddf39aec1bfcbd00·...·]05-3">)</span><span·class="p">.</span><span·class="w">
137 </span><span·class="c1">%%%·{&#39;EXIT&#39;,·ClientPid,·Reason}··(client·terminated·or·unreachable.</span><span·class="w">137 </span><span·class="c1">%%%·{&#39;EXIT&#39;,·ClientPid,·Reason}··(client·terminated·or·unreachable.</span><span·class="w">
  
138 </span><span·class="c1">%%%·Messages·from·Server·to·Client,·received·in·await_result/0·function</span><span·class="w">138 </span><span·class="c1">%%%·Messages·from·Server·to·Client,·received·in·await_result/0·function</span><span·class="w">
139 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546639905-5">(</span><span·class="ss">abort_client</span><span·class="p">,</span><span·class="p"·data-group-id="8546639905-6">{</span><span·class="ss">message</span><span·class="p"·data-group-id="8546639905-6">}</span><span·class="p"·data-group-id="854663[·...·truncated·by·diffoscope;·len:·2,·SHA:·8c1f1046219ddd216a023f792356ddf127fce372a72ec9b4cdac989ee5b0b455·...·]05-5">)</span><span·class="p">.</span><span·class="w">139 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0989777705-5">(</span><span·class="ss">abort_client</span><span·class="p">,</span><span·class="p"·data-group-id="0989777705-6">{</span><span·class="ss">message</span><span·class="p"·data-group-id="0989777705-6">}</span><span·class="p"·data-group-id="098977[·...·truncated·by·diffoscope;·len:·2,·SHA:·a88a7902cb4ef697ba0b6759c50e8c10297ff58f942243de19b984841bfe1f73·...·]05-5">)</span><span·class="p">.</span><span·class="w">
140 </span><span·class="c1">%%%·Messages·are:·user_exists_at_other_node,</span><span·class="w">140 </span><span·class="c1">%%%·Messages·are:·user_exists_at_other_node,</span><span·class="w">
141 </span><span·class="c1">%%%···············you_are_not_logged_on</span><span·class="w">141 </span><span·class="c1">%%%···············you_are_not_logged_on</span><span·class="w">
142 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546639905-7">(</span><span·class="ss">server_reply</span><span·class="p">,</span><span·class="p"·data-group-id="8546639905-8">{</span><span·class="ss">message</span><span·class="p"·data-group-id="8546639905-8">}</span><span·class="p"·data-group-id="854663[·...·truncated·by·diffoscope;·len:·2,·SHA:·8c1f1046219ddd216a023f792356ddf127fce372a72ec9b4cdac989ee5b0b455·...·]05-7">)</span><span·class="p">.</span><span·class="w">142 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0989777705-7">(</span><span·class="ss">server_reply</span><span·class="p">,</span><span·class="p"·data-group-id="0989777705-8">{</span><span·class="ss">message</span><span·class="p"·data-group-id="0989777705-8">}</span><span·class="p"·data-group-id="098977[·...·truncated·by·diffoscope;·len:·2,·SHA:·a88a7902cb4ef697ba0b6759c50e8c10297ff58f942243de19b984841bfe1f73·...·]05-7">)</span><span·class="p">.</span><span·class="w">
143 </span><span·class="c1">%%%·Messages·are:·logged_on</span><span·class="w">143 </span><span·class="c1">%%%·Messages·are:·logged_on</span><span·class="w">
144 </span><span·class="c1">%%%···············receiver_not_found</span><span·class="w">144 </span><span·class="c1">%%%···············receiver_not_found</span><span·class="w">
145 </span><span·class="c1">%%%···············sent··(Message·has·been·sent·(no·guarantee)</span><span·class="w">145 </span><span·class="c1">%%%···············sent··(Message·has·been·sent·(no·guarantee)</span><span·class="w">
146 </span><span·class="c1">%%%·Messages·from·Server·to·Client·received·in·client/1·function</span><span·class="w">146 </span><span·class="c1">%%%·Messages·from·Server·to·Client·received·in·client/1·function</span><span·class="w">
147 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546639905-9">(</span><span·class="ss">message_from</span><span·class="p">,</span><span·class="p"·data-group-id="8546639905-10">{</span><span·class="ss">from_name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·cl[·...·truncated·by·diffoscope;·len:·85,·SHA:·a55ca88160efefd5848cf2ea273b3e4fef11004729b9f8fe19335d63350c70b5·...·]05-9">)</span><span·class="p">.</span><span·class="w">147 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0989777705-9">(</span><span·class="ss">message_from</span><span·class="p">,</span><span·class="p"·data-group-id="0989777705-10">{</span><span·class="ss">from_name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·cl[·...·truncated·by·diffoscope;·len:·85,·SHA:·42dc6d03ad0d9deb8315314353bd97814490a994171eb693d24cc0e579058c3a·...·]05-9">)</span><span·class="p">.</span><span·class="w">
  
148 </span><span·class="c1">%%%·Messages·from·shell·to·Client·received·in·client/1·function</span><span·class="w">148 </span><span·class="c1">%%%·Messages·from·shell·to·Client·received·in·client/1·function</span><span·class="w">
149 </span><span·class="c1">%%%·spawn(mess_client,·client,·[server_node(),·Name])</span><span·class="w">149 </span><span·class="c1">%%%·spawn(mess_client,·client,·[server_node(),·Name])</span><span·class="w">
150 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546639905-11">(</span><span·class="ss">message_to</span><span·class="p">,</span><span·class="p"·data-group-id="8546639905-12">{</span><span·class="ss">to_name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·class[·...·truncated·by·diffoscope;·len:·82,·SHA:·f20be844d6c8b867d6b30b33eade3da13f8407de0889aa1ffa7dc897c4c3bbb6·...·]05-11">)</span><span·class="p">.</span><span·class="w">150 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0989777705-11">(</span><span·class="ss">message_to</span><span·class="p">,</span><span·class="p"·data-group-id="0989777705-12">{</span><span·class="ss">to_name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·class[·...·truncated·by·diffoscope;·len:·82,·SHA:·e5d14939ec1a8dc14b92727a3e164ab1f9be0b0352d975fed0c66996fc4162c2·...·]05-11">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="c1">%%%·logoff</span><span·class="w">151 </span><span·class="c1">%%%·logoff</span><span·class="w">
  
152 </span><span·class="c1">%%%----END·FILE----</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·user_interface.erl----</span><span·class="w">152 </span><span·class="c1">%%%----END·FILE----</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·user_interface.erl----</span><span·class="w">
  
153 </span><span·class="c1">%%%·User·interface·to·the·messenger·program</span><span·class="w">153 </span><span·class="c1">%%%·User·interface·to·the·messenger·program</span><span·class="w">
154 </span><span·class="c1">%%%·login(Name)</span><span·class="w">154 </span><span·class="c1">%%%·login(Name)</span><span·class="w">
155 </span><span·class="c1">%%%·····One·user·at·a·time·can·log·in·from·each·Erlang·node·in·the</span><span·class="w">155 </span><span·class="c1">%%%·····One·user·at·a·time·can·log·in·from·each·Erlang·node·in·the</span><span·class="w">
Offset 170, 177 lines modifiedOffset 170, 177 lines modified
170 </span><span·class="c1">%%%·····Logs·off·anybody·at·that·node</span><span·class="w">170 </span><span·class="c1">%%%·····Logs·off·anybody·at·that·node</span><span·class="w">
  
171 </span><span·class="c1">%%%·message(ToName,·Message)</span><span·class="w">171 </span><span·class="c1">%%%·message(ToName,·Message)</span><span·class="w">
172 </span><span·class="c1">%%%·····sends·Message·to·ToName.·Error·messages·if·the·user·of·this</span><span·class="w">172 </span><span·class="c1">%%%·····sends·Message·to·ToName.·Error·messages·if·the·user·of·this</span><span·class="w">
173 </span><span·class="c1">%%%·····function·is·not·logged·on·or·if·ToName·is·not·logged·on·at</span><span·class="w">173 </span><span·class="c1">%%%·····function·is·not·logged·on·or·if·ToName·is·not·logged·on·at</span><span·class="w">
174 </span><span·class="c1">%%%·····any·node.</span><span·class="w">174 </span><span·class="c1">%%%·····any·node.</span><span·class="w">
175 </span><span·class="w">175 </span><span·class="w">
176 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7790901491-1">(</span><span·class="ss">user_interface</span><span·class="p"·data-group-id="7790901491-1">)</span><span·class="p">.</span><span·class="w">176 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2523181857-1">(</span><span·class="ss">user_interface</span><span·class="p"·data-group-id="2523181857-1">)</span><span·class="p">.</span><span·class="w">
177 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7790901491-2">(</span><span·class="p"·data-group-id="7790901491-3">[</span><span·class="ss">logon</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logoff</span><span·class="p">/</span><[·...·truncated·by·diffoscope;·len:·246,·SHA:·adda8b9d43321de97b6e69b725be5f37cd6c82bc2dd6784b946edfcfc7651d19·...·]-2">)</span><span·class="p">.</span><span·class="w">177 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2523181857-2">(</span><span·class="p"·data-group-id="2523181857-3">[</span><span·class="ss">logon</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logoff</span><span·class="p">/</span><[·...·truncated·by·diffoscope;·len:·246,·SHA:·0912464b06c2b74a2074f54cc01b854d85029baf46ff6c0c46d8a2c32f68bf57·...·]-2">)</span><span·class="p">.</span><span·class="w">
178 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="7790901491-4">(</span><span·class="s">&quot;mess_interface.hrl&quot;</span><span·class="p"·data-group-id="7790901491-4">)</span><span·class="p">.</span><span·class="w">178 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="2523181857-4">(</span><span·class="s">&quot;mess_interface.hrl&quot;</span><span·class="p"·data-group-id="2523181857-4">)</span><span·class="p">.</span><span·class="w">
179 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="7790901491-5">(</span><span·class="s">&quot;mess_config.hrl&quot;</span><span·class="p"·data-group-id="7790901491-5">)</span><span·class="p">.</span><span·class="w">179 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="2523181857-5">(</span><span·class="s">&quot;mess_config.hrl&quot;</span><span·class="p"·data-group-id="2523181857-5">)</span><span·class="p">.</span><span·class="w">
  
180 </span><span·class="nf">logon</span><span·class="p"·data-group-id="7790901491-6">(</span><span·class="n">Name</span><span·class="p"·data-group-id="7790901491-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 </span><span·class="nf">logon</span><span·class="p"·data-group-id="2523181857-6">(</span><span·class="n">Name</span><span·class="p"·data-group-id="2523181857-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">whereis</span><span·class="p"·data-group-id="7790901491-7">(</span><span·class="ss">mess_client</span><span·class="p"·data-group-id="7790901491-7">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">181 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">whereis</span><span·class="p"·data-group-id="2523181857-7">(</span><span·class="ss">mess_client</span><span·class="p"·data-group-id="2523181857-7">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
182 ········</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 ········</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ············</span><span·class="nf">register</span><span·class="p"·data-group-id="7790901491-8">(</span><span·class="ss">mess_client</span><span·class="p">,</span><span·class="w">183 ············</span><span·class="nf">register</span><span·class="p"·data-group-id="2523181857-8">(</span><span·class="ss">mess_client</span><span·class="p">,</span><span·class="w">
184 ·····················</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7790901491-9">(</span><span·class="ss">mess_client</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">client</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7790901491-10">[</span><span·class="o">?</[·...·truncated·by·diffoscope;·len:·263,·SHA:·e8b66acbb4e1ca28ca68284dce6ec25557dc98ec7ab3683baed8c2c0d30001c1·...·]-8">)</span><span·class="p">;</span><span·class="w">184 ·····················</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2523181857-9">(</span><span·class="ss">mess_client</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">client</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2523181857-10">[</span><span·class="o">?</[·...·truncated·by·diffoscope;·len:·263,·SHA:·b24c1fc3e5b4a48801d0413a39a42ccfa6420ef0dd8939e8951ed713156e4428·...·]-8">)</span><span·class="p">;</span><span·class="w">
185 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">already_logged_on</span><span·class="w">185 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">already_logged_on</span><span·class="w">
186 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">186 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
187 </span><span·class="nf">logoff</span><span·class="p"·data-group-id="7790901491-11">(</span><span·class="p"·data-group-id="7790901491-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">187 </span><span·class="nf">logoff</span><span·class="p"·data-group-id="2523181857-11">(</span><span·class="p"·data-group-id="2523181857-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
188 ····</span><span·class="ss">mess_client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">logoff</span><span·class="p">.</span><span·class="w">188 ····</span><span·class="ss">mess_client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">logoff</span><span·class="p">.</span><span·class="w">
  
189 </span><span·class="nf">message</span><span·class="p"·data-group-id="7790901491-12">(</span><span·class="n">ToName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="7790901491-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">189 </span><span·class="nf">message</span><span·class="p"·data-group-id="2523181857-12">(</span><span·class="n">ToName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="2523181857-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
190 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">whereis</span><span·class="p"·data-group-id="7790901491-13">(</span><span·class="ss">mess_client</span><span·class="p"·data-group-id="7790901491-13">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="c1">%·Test·if·the·client·is·running</span><span·class="w">190 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">whereis</span><span·class="p"·data-group-id="2523181857-13">(</span><span·class="ss">mess_client</span><span·class="p"·data-group-id="2523181857-13">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="c1">%·Test·if·the·client·is·running</span><span·class="w">
191 ········</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 ········</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ············</span><span·class="ss">not_logged_on</span><span·class="p">;</span><span·class="w">192 ············</span><span·class="ss">not_logged_on</span><span·class="p">;</span><span·class="w">
193 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">mess_client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">message_to</span><span·class="p"·data-group-id="7790901491-14">{</span><span·class="ss">to_name</span><span·class="o">=</span><span·class="n">ToName</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">Message</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·93c472f93ab15a2a225fd2836d17ba5247b51f5b3a9e1f5959653d4c1d403b92·...·]-14">}</span><span·class="p">,</span><span·class="w">193 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">mess_client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">message_to</span><span·class="p"·data-group-id="2523181857-14">{</span><span·class="ss">to_name</span><span·class="o">=</span><span·class="n">ToName</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">Message</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·4840b0965e6c39b7cc154ff7757822d82c7b069f8019e0cfbcb088495bf5a6f5·...·]-14">}</span><span·class="p">,</span><span·class="w">
194 ·············</span><span·class="ss">ok</span><span·class="w">194 ·············</span><span·class="ss">ok</span><span·class="w">
195 </span><span·class="k">end</span><span·class="p">.</span><span·class="w">195 </span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
196 </span><span·class="c1">%%%----END·FILE----</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_client.erl----</span><span·class="w">196 </span><span·class="c1">%%%----END·FILE----</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_client.erl----</span><span·class="w">
  
197 </span><span·class="c1">%%%·The·client·process·which·runs·on·each·user·node</span><span·class="w">197 </span><span·class="c1">%%%·The·client·process·which·runs·on·each·user·node</span><span·class="w">
198 </span><span·class="w">198 </span><span·class="w">
199 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8373044616-1">(</span><span·class="ss">mess_client</span><span·class="p"·data-group-id="8373044616-1">)</span><span·class="p">.</span><span·class="w">199 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5350514232-1">(</span><span·class="ss">mess_client</span><span·class="p"·data-group-id="5350514232-1">)</span><span·class="p">.</span><span·class="w">
200 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8373044616-2">(</span><span·class="p"·data-group-id="8373044616-3">[</span><span·class="ss">client</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="8373044616-3">]</span><span·class="p"·data-group-id="8373044616-2">)</span><span·class="p">.</span><span·class="w">200 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5350514232-2">(</span><span·class="p"·data-group-id="5350514232-3">[</span><span·class="ss">client</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="5350514232-3">]</span><span·class="p"·data-group-id="5350514232-2">)</span><span·class="p">.</span><span·class="w">
201 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="8373044616-4">(</span><span·class="s">&quot;mess_interface.hrl&quot;</span><span·class="p"·data-group-id="8373044616-4">)</span><span·class="p">.</span><span·class="w">201 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="5350514232-4">(</span><span·class="s">&quot;mess_interface.hrl&quot;</span><span·class="p"·data-group-id="5350514232-4">)</span><span·class="p">.</span><span·class="w">
  
202 </span><span·class="nf">client</span><span·class="p"·data-group-id="8373044616-5">(</span><span·class="n">Server_Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="8373044616-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">202 </span><span·class="nf">client</span><span·class="p"·data-group-id="5350514232-5">(</span><span·class="n">Server_Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="5350514232-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
203 ····</span><span·class="p"·data-group-id="8373044616-6">{</span><span·class="ss">messenger</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="8373044616-6">}</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·476,·SHA:·f4a37dac73875738df2f8ec2fe8ca50abe2f0cefba40b6ffe57e7e2e1bcb62ef·...·]-7">}</span><span·class="p">,</span><span·class="w">203 ····</span><span·class="p"·data-group-id="5350514232-6">{</span><span·class="ss">messenger</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="5350514232-6">}</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·476,·SHA:·da5f2683568d039353a55552596240b7244e1cbeb5dbc1270f475bb337b77cae·...·]-7">}</span><span·class="p">,</span><span·class="w">
204 ····</span><span·class="nf">await_result</span><span·class="p"·data-group-id="8373044616-9">(</span><span·class="p"·data-group-id="8373044616-9">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="nf">await_result</span><span·class="p"·data-group-id="5350514232-9">(</span><span·class="p"·data-group-id="5350514232-9">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="8373044616-10">(</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="8373044616-10">)</span><span·class="p">.</span><span·class="w">205 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="5350514232-10">(</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="5350514232-10">)</span><span·class="p">.</span><span·class="w">
  
206 </span><span·class="nf">client</span><span·class="p"·data-group-id="8373044616-11">(</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="8373044616-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 </span><span·class="nf">client</span><span·class="p"·data-group-id="5350514232-11">(</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="5350514232-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ····</span><span·class="k">receive</span><span·class="w">207 ····</span><span·class="k">receive</span><span·class="w">
208 ········</span><span·class="ss">logoff</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 ········</span><span·class="ss">logoff</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="8373044616-12">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="8373044616-12">)</span><span·class="p">;</span><span·class="w">209 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="5350514232-12">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="5350514232-12">)</span><span·class="p">;</span><span·class="w">
210 ········</span><span·class="o">#</span><span·class="ss">message_to</span><span·class="p"·data-group-id="8373044616-13">{</span><span·class="ss">to_name</span><span·class="o">=</span><span·class="n">ToName</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">Message</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·5721239ff45ae99cedf0424ff38709df7de90d2d89e505999abdd6ee0e816d7e·...·]-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 ········</span><span·class="o">#</span><span·class="ss">message_to</span><span·class="p"·data-group-id="5350514232-13">{</span><span·class="ss">to_name</span><span·class="o">=</span><span·class="n">ToName</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">Message</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·79b432d11791ccfd94800e92107349f5ef989e10679d463cda9b699d0e96518d·...·]-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ············</span><span·class="p"·data-group-id="8373044616-14">{</span><span·class="ss">messenger</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="8373044616-14">}</span><span·class="w">·</span><span·class="o">!</span><span·class="w">211 ············</span><span·class="p"·data-group-id="5350514232-14">{</span><span·class="ss">messenger</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="5350514232-14">}</span><span·class="w">·</span><span·class="o">!</span><span·class="w">
212 ················</span><span·class="o">#</span><span·class="ss">message</span><span·class="p"·data-group-id="8373044616-15">{</span><span·class="ss">client_pid</span><span·class="o">=</span><span·class="nf">self</span><span·class="p"·data-group-id="8373044616-16">(</span><span·class="p"·data-group-id="8373044616-16">)</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·267,·SHA:·6048f6316d8181e84d1d6caa1467d2ab2a203d0ef4f97688cb6b860d2a7da3db·...·]-15">}</span><span·class="p">,</span><span·class="w">212 ················</span><span·class="o">#</span><span·class="ss">message</span><span·class="p"·data-group-id="5350514232-15">{</span><span·class="ss">client_pid</span><span·class="o">=</span><span·class="nf">self</span><span·class="p"·data-group-id="5350514232-16">(</span><span·class="p"·data-group-id="5350514232-16">)</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·267,·SHA:·462a3de6aacd6a3a064d5b7e31436cd711230c543db0d46ccb79f883333291f7·...·]-15">}</span><span·class="p">,</span><span·class="w">
213 ············</span><span·class="nf">await_result</span><span·class="p"·data-group-id="8373044616-17">(</span><span·class="p"·data-group-id="8373044616-17">)</span><span·class="p">;</span><span·class="w">213 ············</span><span·class="nf">await_result</span><span·class="p"·data-group-id="5350514232-17">(</span><span·class="p"·data-group-id="5350514232-17">)</span><span·class="p">;</span><span·class="w">
214 ········</span><span·class="p"·data-group-id="8373044616-18">{</span><span·class="ss">message_from</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FromName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="837304461[·...·truncated·by·diffoscope;·len:·1,·SHA:·e7f6c011776e8db7cd330b54174fd76f7d0216b612387a5ffcfb81e6f0919683·...·]-18">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 ········</span><span·class="p"·data-group-id="5350514232-18">{</span><span·class="ss">message_from</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FromName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="535051423[·...·truncated·by·diffoscope;·len:·1,·SHA:·d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35·...·]-18">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8373044616-19">(</span><span·class="s">&quot;Message·from·</span><span·class="si">~p</span><span·class="s">:·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·247,·SHA:·786420d14f876ba36f11058bc30bea1322834804fc8911aa87852858fd044a69·...·]-19">)</span><span·class="w">215 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5350514232-19">(</span><span·class="s">&quot;Message·from·</span><span·class="si">~p</span><span·class="s">:·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·247,·SHA:·d18735fc2dc0470692e40fb086e7bddb471054d8eb8659d61cea0f20707fbea0·...·]-19">)</span><span·class="w">
216 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">216 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
217 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="8373044616-21">(</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="8373044616-21">)</span><span·class="p">.</span><span·class="w">217 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="5350514232-21">(</span><span·class="n">Server_Node</span><span·class="p"·data-group-id="5350514232-21">)</span><span·class="p">.</span><span·class="w">
  
218 </span><span·class="c1">%%%·wait·for·a·response·from·the·server</span><span·class="w">218 </span><span·class="c1">%%%·wait·for·a·response·from·the·server</span><span·class="w">
219 </span><span·class="nf">await_result</span><span·class="p"·data-group-id="8373044616-22">(</span><span·class="p"·data-group-id="8373044616-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 </span><span·class="nf">await_result</span><span·class="p"·data-group-id="5350514232-22">(</span><span·class="p"·data-group-id="5350514232-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ····</span><span·class="k">receive</span><span·class="w">220 ····</span><span·class="k">receive</span><span·class="w">
221 ········</span><span·class="o">#</span><span·class="ss">abort_client</span><span·class="p"·data-group-id="8373044616-23">{</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">Why</span><span·class="p"·data-group-id="8373044616-23">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">221 ········</span><span·class="o">#</span><span·class="ss">abort_client</span><span·class="p"·data-group-id="5350514232-23">{</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">Why</span><span·class="p"·data-group-id="5350514232-23">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
222 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8373044616-24">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8373044616-25">[</span><span·class="n">Why</[·...·truncated·by·diffoscope;·len:·100,·SHA:·74b18f35f25f7c2aee825bced7a69c8bc8044f99bc37f24bfdad017f9fcd3ced·...·]-24">)</span><span·class="p">,</span><span·class="w">222 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5350514232-24">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5350514232-25">[</span><span·class="n">Why</[·...·truncated·by·diffoscope;·len:·100,·SHA:·269ecd03df9b5bd4fe3cc6184826b3dc376fd4f4f002db77595ed004513f6329·...·]-24">)</span><span·class="p">,</span><span·class="w">
223 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="8373044616-26">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="8373044616-26">)</span><span·class="p">;</span><span·class="w">223 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="5350514232-26">(</span><span·class="ss">normal</span><span·class="p"·data-group-id="5350514232-26">)</span><span·class="p">;</span><span·class="w">
224 ········</span><span·class="o">#</span><span·class="ss">server_reply</span><span·class="p"·data-group-id="8373044616-27">{</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">What</span><span·class="p"·data-group-id="8373044616-27">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 ········</span><span·class="o">#</span><span·class="ss">server_reply</span><span·class="p"·data-group-id="5350514232-27">{</span><span·class="ss">message</span><span·class="o">=</span><span·class="n">What</span><span·class="p"·data-group-id="5350514232-27">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8373044616-28">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8373044616-29">[</span><span·class="n">What<[·...·truncated·by·diffoscope;·len:·101,·SHA:·8798b10d6c2b373a6269cb1167f83e65a2455b6eb489656b32dba3ecf9acd0d7·...·]-28">)</span><span·class="w">225 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5350514232-28">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5350514232-29">[</span><span·class="n">What<[·...·truncated·by·diffoscope;·len:·101,·SHA:·a8f04c0d9d86a7b25058c5e0cc0ec75e57c48e93aee7efba026ff1e2fc652aef·...·]-28">)</span><span·class="w">
226 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">226 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
227 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8373044616-30">(</span><span·class="s">&quot;No·response·from·server</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8373044616-31">[</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·71,·SHA:·a7446e521aa6b1d2c820696370a3ebba6e3168ec412ff46d9578e319e9a840ad·...·]-30">)</span><span·class="p">,</span><span·class="w">227 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5350514232-30">(</span><span·class="s">&quot;No·response·from·server</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5350514232-31">[</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·71,·SHA:·c033c8ca9a3e7e71775a37956b59faf6b2c31d34bc4fc4d5649d63f837dbf8e0·...·]-30">)</span><span·class="p">,</span><span·class="w">
228 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="8373044616-32">(</span><span·class="ss">timeout</span><span·class="p"·data-group-id="8373044616-32">)</span><span·class="w">228 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="5350514232-32">(</span><span·class="ss">timeout</span><span·class="p"·data-group-id="5350514232-32">)</span><span·class="w">
229 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">229 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
230 </span><span·class="c1">%%%----END·FILE---</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_server.erl----</span><span·class="w">230 </span><span·class="c1">%%%----END·FILE---</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%----FILE·mess_server.erl----</span><span·class="w">
  
231 </span><span·class="c1">%%%·This·is·the·server·process·of·the·messenger·service</span><span·class="w">231 </span><span·class="c1">%%%·This·is·the·server·process·of·the·messenger·service</span><span·class="w">
232 </span><span·class="w">232 </span><span·class="w">
233 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7482021283-1">(</span><span·class="ss">mess_server</span><span·class="p"·data-group-id="7482021283-1">)</span><span·class="p">.</span><span·class="w">233 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5056656474-1">(</span><span·class="ss">mess_server</span><span·class="p"·data-group-id="5056656474-1">)</span><span·class="p">.</span><span·class="w">
234 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7482021283-2">(</span><span·class="p"·data-group-id="7482021283-3">[</span><span·class="ss">start_server</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">server</span><span·class="p">/<[·...·truncated·by·diffoscope;·len:·125,·SHA:·61d6d49aa5ac4abdbcaad5b1ddbc71f6fc55040acc87b206d137925f9a3b8890·...·]-2">)</span><span·class="p">.</span><span·class="w">234 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5056656474-2">(</span><span·class="p"·data-group-id="5056656474-3">[</span><span·class="ss">start_server</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">server</span><span·class="p">/<[·...·truncated·by·diffoscope;·len:·125,·SHA:·7feda3c0f45373156505b9819d0a2883849ebe30e6071fd9944788b9530b31dd·...·]-2">)</span><span·class="p">.</span><span·class="w">
235 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="7482021283-4">(</span><span·class="s">&quot;mess_interface.hrl&quot;</span><span·class="p"·data-group-id="7482021283-4">)</span><span·class="p">.</span><span·class="w">235 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="5056656474-4">(</span><span·class="s">&quot;mess_interface.hrl&quot;</span><span·class="p"·data-group-id="5056656474-4">)</span><span·class="p">.</span><span·class="w">
  
236 </span><span·class="nf">server</span><span·class="p"·data-group-id="7482021283-5">(</span><span·class="p"·data-group-id="7482021283-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">236 </span><span·class="nf">server</span><span·class="p"·data-group-id="5056656474-5">(</span><span·class="p"·data-group-id="5056656474-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
237 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="7482021283-6">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="7482021283-6">)</span><span·class="p">,</span><span·class="w">237 ····</span><span·class="nf">process_flag</span><span·class="p"·data-group-id="5056656474-6">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="5056656474-6">)</span><span·class="p">,</span><span·class="w">
238 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="7482021283-7">(</span><span·class="p"·data-group-id="7482021283-8">[</span><span·class="p"·data-group-id="7482021283-8">]</span><span·class="p"·data-group-id="7482021283-7">)</span><span·class="p">.</span><span·class="w">238 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="5056656474-7">(</span><span·class="p"·data-group-id="5056656474-8">[</span><span·class="p"·data-group-id="5056656474-8">]</span><span·class="p"·data-group-id="5056656474-7">)</span><span·class="p">.</span><span·class="w">
  
239 </span><span·class="c1">%%%·the·user·list·has·the·format·[{ClientPid1,·Name1},{ClientPid22,·Name2},...]</span><span·class="w">239 </span><span·class="c1">%%%·the·user·list·has·the·format·[{ClientPid1,·Name1},{ClientPid22,·Name2},...]</span><span·class="w">
240 </span><span·class="nf">server</span><span·class="p"·data-group-id="7482021283-9">(</span><span·class="n">User_List</span><span·class="p"·data-group-id="7482021283-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">240 </span><span·class="nf">server</span><span·class="p"·data-group-id="5056656474-9">(</span><span·class="n">User_List</span><span·class="p"·data-group-id="5056656474-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
241 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7482021283-10">(</span><span·class="s">&quot;User·list·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7482021283-11">[</span><span·cla[·...·truncated·by·diffoscope;·len:·118,·SHA:·1c2580f221cfd1f5a8dda80fe43f2fb431e89b3d7079012106637810f678200b·...·]-10">)</span><span·class="p">,</span><span·class="w">241 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5056656474-10">(</span><span·class="s">&quot;User·list·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5056656474-11">[</span><span·cla[·...·truncated·by·diffoscope;·len:·118,·SHA:·00bb879964eecda878d809400075c8c854c75c81429f35ad607ff2b21c9a368b·...·]-10">)</span><span·class="p">,</span><span·class="w">
242 ····</span><span·class="k">receive</span><span·class="w">242 ····</span><span·class="k">receive</span><span·class="w">
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120 ····<i·class="ri-link-m"·aria-hidden="true"></i>120 ····<i·class="ri-link-m"·aria-hidden="true"></i>
121 ··</a>121 ··</a>
122 ··<span·class="text">Function·Declaration·Syntax</span>122 ··<span·class="text">Function·Declaration·Syntax</span>
123 </h2>123 </h2>
124 <p>A·<em>function·declaration</em>·is·a·sequence·of·function·clauses·separated·by124 <p>A·<em>function·declaration</em>·is·a·sequence·of·function·clauses·separated·by
125 semicolons,·and·terminated·by·a·period·(<code·class="inline">.</code>).</p><p>A·<em>function·clause</em>·consists·of·a·<em>clause·head</em>·and·a·<em>clause·body</em>,·separated·by125 semicolons,·and·terminated·by·a·period·(<code·class="inline">.</code>).</p><p>A·<em>function·clause</em>·consists·of·a·<em>clause·head</em>·and·a·<em>clause·body</em>,·separated·by
126 <code·class="inline">-&gt;</code>.</p><p>A·clause·<em>head</em>·consists·of·the·function·name,·an·argument·list,·and·an·optional126 <code·class="inline">-&gt;</code>.</p><p>A·clause·<em>head</em>·consists·of·the·function·name,·an·argument·list,·and·an·optional
127 guard·sequence·beginning·with·the·keyword·<code·class="inline">when</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Name</span><span·class="p"·data-group-id="2549363294-1">(</span><span·class="n">Pattern11</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">Pattern1N</span><span·class="p"·data-group-id="2549363294-1">)</sp[·...·truncated·by·diffoscope;·len:·204,·SHA:·813db843ff47e8eb59f94535e100989eebd46f3b6953255ec3ae0309fa5f1656·...·]-2">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">127 guard·sequence·beginning·with·the·keyword·<code·class="inline">when</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Name</span><span·class="p"·data-group-id="3684412950-1">(</span><span·class="n">Pattern11</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">Pattern1N</span><span·class="p"·data-group-id="3684412950-1">)</sp[·...·truncated·by·diffoscope;·len:·204,·SHA:·c19e1b00f707e2f8b2262b5c03625c4e4b14b1a41699e90223a7d25e4178aa12·...·]-2">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
128 ····</span><span·class="n">Body1</span><span·class="p">;</span><span·class="w">128 ····</span><span·class="n">Body1</span><span·class="p">;</span><span·class="w">
129 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">;</span><span·class="w">129 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">;</span><span·class="w">
130 </span><span·class="n">Name</span><span·class="p"·data-group-id="2549363294-3">(</span><span·class="n">PatternK1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">PatternKN</span><span·class="p"·data-group-id="2549363294-3">)</sp[·...·truncated·by·diffoscope;·len:·204,·SHA:·afb1a3fdcc24f86d33511386e71c09f53509ddb073b3b05a339bdb674a31c8aa·...·]-4">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">130 </span><span·class="n">Name</span><span·class="p"·data-group-id="3684412950-3">(</span><span·class="n">PatternK1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">PatternKN</span><span·class="p"·data-group-id="3684412950-3">)</sp[·...·truncated·by·diffoscope;·len:·204,·SHA:·208d900376a987ca05ac19ebb8bb0775d6a1b9d0b260bbd5f4721cda413b19a3·...·]-4">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
131 ····</span><span·class="n">BodyK</span><span·class="p">.</span></code></pre><p>The·function·name·is·an·atom.·Each·argument·is·a·pattern.</p><p>The·number·of·arguments·<code·class="inline">N</code>·is·the·<em>arity</em>·of·the·function.·A·function·is131 ····</span><span·class="n">BodyK</span><span·class="p">.</span></code></pre><p>The·function·name·is·an·atom.·Each·argument·is·a·pattern.</p><p>The·number·of·arguments·<code·class="inline">N</code>·is·the·<em>arity</em>·of·the·function.·A·function·is
132 uniquely·defined·by·the·module·name,·function·name,·and·arity.·That·is,·two132 uniquely·defined·by·the·module·name,·function·name,·and·arity.·That·is,·two
133 functions·with·the·same·name·and·in·the·same·module,·but·with·different·arities133 functions·with·the·same·name·and·in·the·same·module,·but·with·different·arities
134 are·two·different·functions.</p><p>A·function·named·<code·class="inline">f</code>·in·module·<code·class="inline">mod</code>·and·with·arity·<code·class="inline">N</code>·is·often·denoted·as134 are·two·different·functions.</p><p>A·function·named·<code·class="inline">f</code>·in·module·<code·class="inline">mod</code>·and·with·arity·<code·class="inline">N</code>·is·often·denoted·as
135 <code·class="inline">mod:f/N</code>.</p><p>A·clause·<em>body</em>·consists·of·a·sequence·of·expressions·separated·by·comma·(<code·class="inline">,</code>):</p><pre><code·class="text">Expr1,135 <code·class="inline">mod:f/N</code>.</p><p>A·clause·<em>body</em>·consists·of·a·sequence·of·expressions·separated·by·comma·(<code·class="inline">,</code>):</p><pre><code·class="text">Expr1,
136 ...,136 ...,
137 ExprN</code></pre><p>Valid·Erlang·expressions·and·guard·sequences·are·described·in137 ExprN</code></pre><p>Valid·Erlang·expressions·and·guard·sequences·are·described·in
138 <a·href="expressions.html">Expressions</a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fact</span><span·class="p"·data-group-id="0504113115-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="0504113115-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="c1">%·first·clause·head</span><span·class="w">138 <a·href="expressions.html">Expressions</a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fact</span><span·class="p"·data-group-id="5787261826-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="5787261826-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">··</span><span·class="c1">%·first·clause·head</span><span·class="w">
139 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="0504113115-2">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="0504113115-2">)</span><span·class="p">;</span><span·class="w">·····</span><span·class="c1">%·first·clause·body</span><span·class="w">139 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="5787261826-2">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="5787261826-2">)</span><span·class="p">;</span><span·class="w">·····</span><span·class="c1">%·first·clause·body</span><span·class="w">
  
140 </span><span·class="nf">fact</span><span·class="p"·data-group-id="0504113115-3">(</span><span·class="mi">0</span><span·class="p"·data-group-id="0504113115-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·············</span><span·class="c1">%·second·clause·head</span><span·class="w">140 </span><span·class="nf">fact</span><span·class="p"·data-group-id="5787261826-3">(</span><span·class="mi">0</span><span·class="p"·data-group-id="5787261826-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·············</span><span·class="c1">%·second·clause·head</span><span·class="w">
141 ····</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">·················</span><span·class="c1">%·second·clause·body</span></code></pre><p><a·href=""·id="eval"></a></p><h2·id="function-evaluation"·class="section-heading">141 ····</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">·················</span><span·class="c1">%·second·clause·body</span></code></pre><p><a·href=""·id="eval"></a></p><h2·id="function-evaluation"·class="section-heading">
142 ··<a·href="#function-evaluation"·class="hover-link">142 ··<a·href="#function-evaluation"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
144 ··</a>144 ··</a>
145 ··<span·class="text">Function·Evaluation</span>145 ··<span·class="text">Function·Evaluation</span>
146 </h2>146 </h2>
147 <p>When·a·function·<code·class="inline">M:F/N</code>·is·called,·first·the·code·for·the·function·is·located.147 <p>When·a·function·<code·class="inline">M:F/N</code>·is·called,·first·the·code·for·the·function·is·located.
148 If·the·function·cannot·be·found,·an·<code·class="inline">undef</code>·runtime·error·occurs.·Notice·that148 If·the·function·cannot·be·found,·an·<code·class="inline">undef</code>·runtime·error·occurs.·Notice·that
149 the·function·must·be·exported·to·be·visible·outside·the·module·it·is·defined·in.</p><p>If·the·function·is·found,·the·function·clauses·are·scanned·sequentially·until·a149 the·function·must·be·exported·to·be·visible·outside·the·module·it·is·defined·in.</p><p>If·the·function·is·found,·the·function·clauses·are·scanned·sequentially·until·a
150 clause·is·found·that·fulfills·both·of·the·following·two·conditions:</p><ol><li>The·patterns·in·the·clause·head·can·be·successfully·matched·against·the·given150 clause·is·found·that·fulfills·both·of·the·following·two·conditions:</p><ol><li>The·patterns·in·the·clause·head·can·be·successfully·matched·against·the·given
151 arguments.</li><li>The·guard·sequence,·if·any,·is·true.</li></ol><p>If·such·a·clause·cannot·be·found,·a·<code·class="inline">function_clause</code>·runtime·error·occurs.</p><p>If·such·a·clause·is·found,·the·corresponding·clause·body·is·evaluated.·That·is,151 arguments.</li><li>The·guard·sequence,·if·any,·is·true.</li></ol><p>If·such·a·clause·cannot·be·found,·a·<code·class="inline">function_clause</code>·runtime·error·occurs.</p><p>If·such·a·clause·is·found,·the·corresponding·clause·body·is·evaluated.·That·is,
152 the·expressions·in·the·body·are·evaluated·sequentially·and·the·value·of·the·last152 the·expressions·in·the·body·are·evaluated·sequentially·and·the·value·of·the·last
153 expression·is·returned.</p><p>Consider·the·function·<code·class="inline">fact</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0930352144-1">(</span><span·class="ss">mod</span><span·class="p"·data-group-id="0930352144-1">)</span><span·class="p">.</span><span·class="w">153 expression·is·returned.</p><p>Consider·the·function·<code·class="inline">fact</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6651803374-1">(</span><span·class="ss">mod</span><span·class="p"·data-group-id="6651803374-1">)</span><span·class="p">.</span><span·class="w">
154 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0930352144-2">(</span><span·class="p"·data-group-id="0930352144-3">[</span><span·class="ss">fact</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="0930352144-3">]</span><span·class="p"·data-group-id="0930352144-2">)</span><span·class="p">.</span><span·class="w">154 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6651803374-2">(</span><span·class="p"·data-group-id="6651803374-3">[</span><span·class="ss">fact</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6651803374-3">]</span><span·class="p"·data-group-id="6651803374-2">)</span><span·class="p">.</span><span·class="w">
  
155 </span><span·class="nf">fact</span><span·class="p"·data-group-id="0930352144-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="0930352144-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">155 </span><span·class="nf">fact</span><span·class="p"·data-group-id="6651803374-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="6651803374-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
156 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="0930352144-5">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0930352144-5">)</span><span·class="p">;</span><span·class="w">156 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="6651803374-5">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="6651803374-5">)</span><span·class="p">;</span><span·class="w">
157 </span><span·class="nf">fact</span><span·class="p"·data-group-id="0930352144-6">(</span><span·class="mi">0</span><span·class="p"·data-group-id="0930352144-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">fact</span><span·class="p"·data-group-id="6651803374-6">(</span><span·class="mi">0</span><span·class="p"·data-group-id="6651803374-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="mi">1</span><span·class="p">.</span></code></pre><p>Assume·that·you·want·to·calculate·the·factorial·for·1:</p><pre><code·class="text">1&gt;·mod:fact(1).</code></pre><p>Evaluation·starts·at·the·first·clause.·The·pattern·<code·class="inline">N</code>·is·matched·against158 ····</span><span·class="mi">1</span><span·class="p">.</span></code></pre><p>Assume·that·you·want·to·calculate·the·factorial·for·1:</p><pre><code·class="text">1&gt;·mod:fact(1).</code></pre><p>Evaluation·starts·at·the·first·clause.·The·pattern·<code·class="inline">N</code>·is·matched·against
159 argument·1.·The·matching·succeeds·and·the·guard·(<code·class="inline">N·&gt;·0</code>)·is·true,·thus·<code·class="inline">N</code>·is159 argument·1.·The·matching·succeeds·and·the·guard·(<code·class="inline">N·&gt;·0</code>)·is·true,·thus·<code·class="inline">N</code>·is
160 bound·to·1,·and·the·corresponding·body·is·evaluated:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="1203998818-1">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="1203998818-1">)</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1[·...·truncated·by·diffoscope;·len:·288,·SHA:·55db3e7731f8b851c73e2dc71df5369bb2e8208dc7c110ee434e69f0e53e3791·...·]-2">)</span><span·class="w">160 bound·to·1,·and·the·corresponding·body·is·evaluated:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="5507285981-1">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="5507285981-1">)</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5[·...·truncated·by·diffoscope;·len:·288,·SHA:·0b943ce37d360a3c27f92e8f51e54900712534092a0db30e38b449ed7b87da8a·...·]-2">)</span><span·class="w">
161 </span><span·class="mi">1</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="1203998818-3">(</span><span·class="mi">0</span><span·class="p"·data-group-id="1203998818-3">)</span></code></pre><p>Now,·<code·class="inline">fact(0)</code>·is·called,·and·the·function·clauses·are·scanned161 </span><span·class="mi">1</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nf">fact</span><span·class="p"·data-group-id="5507285981-3">(</span><span·class="mi">0</span><span·class="p"·data-group-id="5507285981-3">)</span></code></pre><p>Now,·<code·class="inline">fact(0)</code>·is·called,·and·the·function·clauses·are·scanned
162 sequentially·again.·First,·the·pattern·<code·class="inline">N</code>·is·matched·against·0.·The162 sequentially·again.·First,·the·pattern·<code·class="inline">N</code>·is·matched·against·0.·The
163 matching·succeeds,·but·the·guard·(<code·class="inline">N·&gt;·0</code>)·is·false.·Second,·the163 matching·succeeds,·but·the·guard·(<code·class="inline">N·&gt;·0</code>)·is·false.·Second,·the
164 pattern·<code·class="inline">0</code>·is·matched·against·the·argument·<code·class="inline">0</code>.·The·matching·succeeds164 pattern·<code·class="inline">0</code>·is·matched·against·the·argument·<code·class="inline">0</code>.·The·matching·succeeds
165 and·the·body·is·evaluated:</p><pre><code·class="text">1·*·fact(0)·=&gt;165 and·the·body·is·evaluated:</p><pre><code·class="text">1·*·fact(0)·=&gt;
166 1·*·1·=&gt;166 1·*·1·=&gt;
167 1</code></pre><p>Evaluation·has·succeed·and·<code·class="inline">mod:fact(1)</code>·returns·1.</p><p>If·<code·class="inline">mod:fact/1</code>·is·called·with·a·negative·number·as·argument,·no·clause·head167 1</code></pre><p>Evaluation·has·succeed·and·<code·class="inline">mod:fact(1)</code>·returns·1.</p><p>If·<code·class="inline">mod:fact/1</code>·is·called·with·a·negative·number·as·argument,·no·clause·head
168 matches.·A·<code·class="inline">function_clause</code>·runtime·error·occurs.</p><h2·id="tail-recursion"·class="section-heading">168 matches.·A·<code·class="inline">function_clause</code>·runtime·error·occurs.</p><h2·id="tail-recursion"·class="section-heading">
Offset 173, 17 lines modifiedOffset 173, 17 lines modified
173 ··</a>173 ··</a>
174 ··<span·class="text">Tail·recursion</span>174 ··<span·class="text">Tail·recursion</span>
175 </h2>175 </h2>
176 <p>If·the·last·expression·of·a·function·body·is·a·function·call,·a176 <p>If·the·last·expression·of·a·function·body·is·a·function·call,·a
177 <em>tail-recursive·call</em>·is·done.·This·is·to·ensure·that·no·system177 <em>tail-recursive·call</em>·is·done.·This·is·to·ensure·that·no·system
178 resources,·for·example,·call·stack,·are·consumed.·This·means·that·an178 resources,·for·example,·call·stack,·are·consumed.·This·means·that·an
179 infinite·loop·using·tail-recursive·calls·will·not·exhaust·the·call179 infinite·loop·using·tail-recursive·calls·will·not·exhaust·the·call
180 stack·and·can·(in·principle)·run·forever.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="5724942605-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="5724942605-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 stack·and·can·(in·principle)·run·forever.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="4839846761-1">(</span><span·class="n">N</span><span·class="p"·data-group-id="4839846761-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5724942605-2">(</span><span·class="s">&quot;</span><span·class="si">~w</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5724942605-3">[</span><span·class="n">N</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·9125c6fd919491f29c307c8e656292e525814eedfcc05b7170d37128390902e1·...·]-2">)</span><span·class="p">,</span><span·class="w">181 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4839846761-2">(</span><span·class="s">&quot;</span><span·class="si">~w</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4839846761-3">[</span><span·class="n">N</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·86b975cc8616ce6e13e09b044b3196ed15e2403c7dfa761c7ae596745f26574a·...·]-2">)</span><span·class="p">,</span><span·class="w">
182 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="5724942605-4">(</span><span·class="n">N</span><span·class="o">+</span><span·class="mi">1</span><span·class="p"·data-group-id="5724942605-4">)</span><span·class="p">.</span></code></pre><p>The·earlier·factorial·example·is·a·counter-example.·It·is·not182 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="4839846761-4">(</span><span·class="n">N</span><span·class="o">+</span><span·class="mi">1</span><span·class="p"·data-group-id="4839846761-4">)</span><span·class="p">.</span></code></pre><p>The·earlier·factorial·example·is·a·counter-example.·It·is·not
183 tail-recursive,·since·a·multiplication·is·done·on·the·result·of·the·recursive183 tail-recursive,·since·a·multiplication·is·done·on·the·result·of·the·recursive
184 call·to·<code·class="inline">fact(N-1)</code>.</p><h2·id="built-in-functions-bifs"·class="section-heading">184 call·to·<code·class="inline">fact(N-1)</code>.</p><h2·id="built-in-functions-bifs"·class="section-heading">
185 ··<a·href="#built-in-functions-bifs"·class="hover-link">185 ··<a·href="#built-in-functions-bifs"·class="hover-link">
186 ····<i·class="ri-link-m"·aria-hidden="true"></i>186 ····<i·class="ri-link-m"·aria-hidden="true"></i>
187 ··</a>187 ··</a>
188 ··<span·class="text">Built-In·Functions·(BIFs)</span>188 ··<span·class="text">Built-In·Functions·(BIFs)</span>
189 </h2>189 </h2>
Offset 191, 17 lines modifiedOffset 191, 17 lines modified
191 system.·BIFs·do·things·that·are·difficult·or·impossible·to·implement191 system.·BIFs·do·things·that·are·difficult·or·impossible·to·implement
192 in·Erlang.·Most·of·the·BIFs·belong·to·module·<a·href="../../erts-15.2.6/doc/html/erlang.html"><code·class="inline">erlang</code></a>,·but·there192 in·Erlang.·Most·of·the·BIFs·belong·to·module·<a·href="../../erts-15.2.6/doc/html/erlang.html"><code·class="inline">erlang</code></a>,·but·there
193 are·also·BIFs·belonging·to·a·few·other·modules,·for·example·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html"><code·class="inline">lists</code></a>193 are·also·BIFs·belonging·to·a·few·other·modules,·for·example·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html"><code·class="inline">lists</code></a>
194 and·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html"><code·class="inline">ets</code></a>.</p><p>The·most·commonly·used·BIFs·belonging·to·<a·href="../../erts-15.2.6/doc/html/erlang.html"><code·class="inline">erlang</code></a>·are·<em>auto-imported</em>.·They·do194 and·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html"><code·class="inline">ets</code></a>.</p><p>The·most·commonly·used·BIFs·belonging·to·<a·href="../../erts-15.2.6/doc/html/erlang.html"><code·class="inline">erlang</code></a>·are·<em>auto-imported</em>.·They·do
195 not·need·to·be·prefixed·with·the·module·name.·Which·BIFs·that·are·auto-imported195 not·need·to·be·prefixed·with·the·module·name.·Which·BIFs·that·are·auto-imported
196 is·specified·in·the·<a·href="../../erts-15.2.6/doc/html/erlang.html"><code·class="inline">erlang</code></a>·module·in·ERTS.·For·example,·standard-type196 is·specified·in·the·<a·href="../../erts-15.2.6/doc/html/erlang.html"><code·class="inline">erlang</code></a>·module·in·ERTS.·For·example,·standard-type
197 conversion·BIFs·like·<code·class="inline">atom_to_list</code>·and·BIFs·allowed·in·guards·can·be·called197 conversion·BIFs·like·<code·class="inline">atom_to_list</code>·and·BIFs·allowed·in·guards·can·be·called
198 without·specifying·the·module·name.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="6000921510-1">(</span><span·class="p"·data-group-id="6000921510-2">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="6000921510-2">}</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·e3c49f09960db0c340778bcea696aacd27c2ce749360b0bd672c9b8ef29425ff·...·]-1">)</span><span·class="p">.</span><span·class="w">198 without·specifying·the·module·name.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">tuple_size</span><span·class="p"·data-group-id="2134944788-1">(</span><span·class="p"·data-group-id="2134944788-2">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="2134944788-2">}</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·ddcdb8505e112a57f241ed7f116679f9be80b0581d8b0f1d3ca18c0748136f41·...·]-1">)</span><span·class="p">.</span><span·class="w">
199 </span><span·class="mi">3</span><span·class="gp·unselectable">199 </span><span·class="mi">3</span><span·class="gp·unselectable">
200 2&gt;·</span><span·class="nf">atom_to_list</span><span·class="p"·data-group-id="6000921510-3">(</span><span·class="ss">&#39;Erlang&#39;</span><span·class="p"·data-group-id="6000921510-3">)</span><span·class="p">.</span><span·class="w">200 2&gt;·</span><span·class="nf">atom_to_list</span><span·class="p"·data-group-id="2134944788-3">(</span><span·class="ss">&#39;Erlang&#39;</span><span·class="p"·data-group-id="2134944788-3">)</span><span·class="p">.</span><span·class="w">
201 </span><span·class="s">&quot;Erlang&quot;</span></code></pre>201 </span><span·class="s">&quot;Erlang&quot;</span></code></pre>
202 </div>202 </div>
  
203 <div·class="bottom-actions"·id="bottom-actions">203 <div·class="bottom-actions"·id="bottom-actions">
204 ··<div·class="bottom-actions-item">204 ··<div·class="bottom-actions-item">
  
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246 ········Built·using246 ········Built·using
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248 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>248 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
249 ······</p>249 ······</p>
250 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>250 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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125 (grow·and·shrink·dynamically)·with·small·memory·footprint,·fast·to·create·and125 (grow·and·shrink·dynamically)·with·small·memory·footprint,·fast·to·create·and
126 terminate,·and·the·scheduling·overhead·is·low.</p><h2·id="process-creation"·class="section-heading">126 terminate,·and·the·scheduling·overhead·is·low.</p><h2·id="process-creation"·class="section-heading">
127 ··<a·href="#process-creation"·class="hover-link">127 ··<a·href="#process-creation"·class="hover-link">
128 ····<i·class="ri-link-m"·aria-hidden="true"></i>128 ····<i·class="ri-link-m"·aria-hidden="true"></i>
129 ··</a>129 ··</a>
130 ··<span·class="text">Process·Creation</span>130 ··<span·class="text">Process·Creation</span>
131 </h2>131 </h2>
132 <p>A·process·is·created·by·calling·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/3"><code·class="inline">spawn()</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">spawn</span><span·class="p"·data-group-id="3960700683-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><span·class="p"·data-group-id="3960700683-1">)</span><s[·...·truncated·by·diffoscope;·len:·195,·SHA:·8efc5ada3c1285edd6d4f34d9242d5aa3ccf8c1918c05359e3f12c4b18a14201·...·]-2">)</span><span·class="w">132 <p>A·process·is·created·by·calling·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/3"><code·class="inline">spawn()</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">spawn</span><span·class="p"·data-group-id="9799675422-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><span·class="p"·data-group-id="9799675422-1">)</span><s[·...·truncated·by·diffoscope;·len:·195,·SHA:·2dce3c51dbbed1582b9655e8aded0487c630f10687096992b4ca5331a0f3f630·...·]-2">)</span><span·class="w">
133 ··</span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="3960700683-3">(</span><span·class="p"·data-group-id="3960700683-3">)</span><span·class="w">133 ··</span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="9799675422-3">(</span><span·class="p"·data-group-id="9799675422-3">)</span><span·class="w">
134 ··</span><span·class="n">Args</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3960700683-4">[</span><span·class="n">Arg1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">ArgN</span><span·class="p"·data-group-id="3960700683-4">]</span><span·class="w">134 ··</span><span·class="n">Args</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9799675422-4">[</span><span·class="n">Arg1</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="n">ArgN</span><span·class="p"·data-group-id="9799675422-4">]</span><span·class="w">
135 ····</span><span·class="n">ArgI</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="3960700683-5">(</span><span·class="p"·data-group-id="3960700683-5">)</span></code></pre><p><code·class="inline">spawn()</code>·creates·a·new·process·and·returns·the·pid.</p><p>The·new·process·starts·executing·in·<code·class="inline">Module:Name(Arg1,...,ArgN)</code>·where·the135 ····</span><span·class="n">ArgI</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="9799675422-5">(</span><span·class="p"·data-group-id="9799675422-5">)</span></code></pre><p><code·class="inline">spawn()</code>·creates·a·new·process·and·returns·the·pid.</p><p>The·new·process·starts·executing·in·<code·class="inline">Module:Name(Arg1,...,ArgN)</code>·where·the
136 arguments·are·the·elements·of·the·(possible·empty)·<code·class="inline">Args</code>·argument·list.</p><p>There·exist·a·number·of·different·<code·class="inline">spawn</code>·BIFs:</p><ul><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/4"><code·class="inline">spawn/1,2,3,4</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_link/4"><code·class="inline">spawn_link/1,2,3,4</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_monitor/4"><code·class="inline">spawn_monitor/1,2,3,4</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_opt/5"><code·class="inline">spawn_opt/2,3,4,5</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_request/5"><code·class="inline">spawn_request/1,2,3,4,5</code></a></li></ul><h2·id="registered-processes"·class="section-heading">136 arguments·are·the·elements·of·the·(possible·empty)·<code·class="inline">Args</code>·argument·list.</p><p>There·exist·a·number·of·different·<code·class="inline">spawn</code>·BIFs:</p><ul><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn/4"><code·class="inline">spawn/1,2,3,4</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_link/4"><code·class="inline">spawn_link/1,2,3,4</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_monitor/4"><code·class="inline">spawn_monitor/1,2,3,4</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_opt/5"><code·class="inline">spawn_opt/2,3,4,5</code></a></li><li><a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_request/5"><code·class="inline">spawn_request/1,2,3,4,5</code></a></li></ul><h2·id="registered-processes"·class="section-heading">
137 ··<a·href="#registered-processes"·class="hover-link">137 ··<a·href="#registered-processes"·class="hover-link">
138 ····<i·class="ri-link-m"·aria-hidden="true"></i>138 ····<i·class="ri-link-m"·aria-hidden="true"></i>
139 ··</a>139 ··</a>
140 ··<span·class="text">Registered·Processes</span>140 ··<span·class="text">Registered·Processes</span>
141 </h2>141 </h2>
142 <p>Besides·addressing·a·process·by·using·its·pid,·there·are·also·BIFs·for142 <p>Besides·addressing·a·process·by·using·its·pid,·there·are·also·BIFs·for
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583 ······<p·class="built-using">583 ······<p·class="built-using">
584 ········Built·using584 ········Built·using
585 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the585 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
586 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>586 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
587 ······</p>587 ······</p>
588 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>588 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
589 ····</footer>589 ····</footer>
590 ··</div>590 ··</div>
591 </main>591 </main>
592 </div>592 </div>
593 <script>593 <script>
594 ··function·mermaidLoaded()·{594 ··function·mermaidLoaded()·{
595 ····mermaid.initialize({595 ····mermaid.initialize({
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123 ····<i·class="ri-link-m"·aria-hidden="true"></i>123 ····<i·class="ri-link-m"·aria-hidden="true"></i>
124 ··</a>124 ··</a>
125 ··<span·class="text">Defining·Records</span>125 ··<span·class="text">Defining·Records</span>
126 </h2>126 </h2>
127 <p>A·record·definition·consists·of·the·name·of·the·record,·followed·by·the·field127 <p>A·record·definition·consists·of·the·name·of·the·record,·followed·by·the·field
128 names·of·the·record.·Record·and·field·names·must·be·atoms.·Each·field·can·be128 names·of·the·record.·Record·and·field·names·must·be·atoms.·Each·field·can·be
129 given·an·optional·default·value.·If·no·default·value·is·supplied,·<code·class="inline">undefined</code>·is129 given·an·optional·default·value.·If·no·default·value·is·supplied,·<code·class="inline">undefined</code>·is
130 used.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1372814598-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1372814598-2">{</span><span·class="n">Field1</span><span·class="w">·</span><span·class="p"·data-group-id="1372814598-3">[</span><[·...·truncated·by·diffoscope;·len:·116,·SHA:·7d1b6a907b4db3b952f371210c40cb3bd78bf67053f6cf4e2a2553e77b1e4981·...·]-3">]</span><span·class="p">,</span><span·class="w">130 used.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1576275830-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1576275830-2">{</span><span·class="n">Field1</span><span·class="w">·</span><span·class="p"·data-group-id="1576275830-3">[</span><[·...·truncated·by·diffoscope;·len:·116,·SHA:·415b2c69607432c0ff2e3feaf31f4436b4280aecee33718287c56461107f09a4·...·]-3">]</span><span·class="p">,</span><span·class="w">
131 ···············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">131 ···············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
132 ···············</span><span·class="n">FieldN</span><span·class="w">·</span><span·class="p"·data-group-id="1372814598-4">[</span><span·class="o">=</span><span·class="w">·</span><span·class="n">ExprN</span><span·class="p"·data-group-id="1372814598-4">]</span><span·class="p"·data-group-id="1372814598-2">}</span><span·class="p"·data-group-id="1372814598-1">)</span><span·class="p">.</span></code></pre><p>The·default·value·for·a·field·is·an·arbitrary·expression,·except·that·it·must132 ···············</span><span·class="n">FieldN</span><span·class="w">·</span><span·class="p"·data-group-id="1576275830-4">[</span><span·class="o">=</span><span·class="w">·</span><span·class="n">ExprN</span><span·class="p"·data-group-id="1576275830-4">]</span><span·class="p"·data-group-id="1576275830-2">}</span><span·class="p"·data-group-id="1576275830-1">)</span><span·class="p">.</span></code></pre><p>The·default·value·for·a·field·is·an·arbitrary·expression,·except·that·it·must
133 not·use·any·variables.</p><p>A·record·definition·can·be·placed·anywhere·among·the·attributes·and·function133 not·use·any·variables.</p><p>A·record·definition·can·be·placed·anywhere·among·the·attributes·and·function
134 declarations·of·a·module,·but·the·definition·must·come·before·any·usage·of·the134 declarations·of·a·module,·but·the·definition·must·come·before·any·usage·of·the
135 record.</p><p>If·a·record·is·used·in·several·modules,·it·is·recommended·that·the·record135 record.</p><p>If·a·record·is·used·in·several·modules,·it·is·recommended·that·the·record
136 definition·is·placed·in·an·include·file.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Starting·from·Erlang/OTP·26,·records·can·be·defined·in·the·Erlang·shell136 definition·is·placed·in·an·include·file.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Starting·from·Erlang/OTP·26,·records·can·be·defined·in·the·Erlang·shell
137 using·the·syntax·described·in·this·section.·In·earlier·releases,·it·was137 using·the·syntax·described·in·this·section.·In·earlier·releases,·it·was
138 necessary·to·use·the·<a·href="../../lib/stdlib-6.2.2/doc/html/shell.html"><code·class="inline">shell</code></a>·built-in·function·<code·class="inline">rd/2</code>.</p></section><h2·id="creating-records"·class="section-heading">138 necessary·to·use·the·<a·href="../../lib/stdlib-6.2.2/doc/html/shell.html"><code·class="inline">shell</code></a>·built-in·function·<code·class="inline">rd/2</code>.</p></section><h2·id="creating-records"·class="section-heading">
139 ··<a·href="#creating-records"·class="hover-link">139 ··<a·href="#creating-records"·class="hover-link">
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143 </h2>143 </h2>
144 <p>The·following·expression·creates·a·new·<code·class="inline">Name</code>·record·where·the·value·of·each144 <p>The·following·expression·creates·a·new·<code·class="inline">Name</code>·record·where·the·value·of·each
145 field·<code·class="inline">FieldI</code>·is·the·value·of·evaluating·the·corresponding·expression·<code·class="inline">ExprI</code>:</p><pre><code·class="text">#Name{Field1=Expr1,·...,·FieldK=ExprK}</code></pre><p>The·fields·can·be·in·any·order,·not·necessarily·the·same·order·as·in·the·record145 field·<code·class="inline">FieldI</code>·is·the·value·of·evaluating·the·corresponding·expression·<code·class="inline">ExprI</code>:</p><pre><code·class="text">#Name{Field1=Expr1,·...,·FieldK=ExprK}</code></pre><p>The·fields·can·be·in·any·order,·not·necessarily·the·same·order·as·in·the·record
146 definition,·and·fields·can·be·omitted.·Omitted·fields·get·their·respective146 definition,·and·fields·can·be·omitted.·Omitted·fields·get·their·respective
147 default·value·instead.</p><p>If·several·fields·are·to·be·assigned·the·same·value,·the·following·construction147 default·value·instead.</p><p>If·several·fields·are·to·be·assigned·the·same·value,·the·following·construction
148 can·be·used:</p><pre><code·class="text">#Name{Field1=Expr1,·...,·FieldK=ExprK,·_=ExprL}</code></pre><p>Omitted·fields·then·get·the·value·of·evaluating·<code·class="inline">ExprL</code>·instead·of·their·default148 can·be·used:</p><pre><code·class="text">#Name{Field1=Expr1,·...,·FieldK=ExprK,·_=ExprL}</code></pre><p>Omitted·fields·then·get·the·value·of·evaluating·<code·class="inline">ExprL</code>·instead·of·their·default
149 values.·This·feature·is·primarily·intended·to·be·used·to·create·patterns·for·ETS149 values.·This·feature·is·primarily·intended·to·be·used·to·create·patterns·for·ETS
150 and·Mnesia·match·functions.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5024807337-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5024807337-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span[·...·truncated·by·diffoscope;·len:·174,·SHA:·e9a6486a9991daa663f0ccdc07a4ca41123b9eb627a13f24eeb339ffa7856157·...·]-1">)</span><span·class="p">.</span><span·class="w">150 and·Mnesia·match·functions.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5963210643-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5963210643-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</span[·...·truncated·by·diffoscope;·len:·174,·SHA:·1b330fd18e163abec978579d6d8c28b6dfc22d61fd77cd1281e5a20eae701fb2·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
151 </span><span·class="nf">lookup</span><span·class="p"·data-group-id="5024807337-3">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p"·data-group-id="5024807337-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">151 </span><span·class="nf">lookup</span><span·class="p"·data-group-id="5963210643-3">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p"·data-group-id="5963210643-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
152 ····</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_object</span><span·class="p"·data-group-id="5024807337-4">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="5024807337-5">{</span><span·class="ss">name</span><span·class="o">=</span><s[·...·truncated·by·diffoscope;·len:·250,·SHA:·3c522c20c0957d07aaa2d82926359f0e7a97662b8ec2794df2c07a12afbe4599·...·]-4">)</span><span·class="p">.</span></code></pre><h2·id="accessing-record-fields"·class="section-heading">152 ····</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_object</span><span·class="p"·data-group-id="5963210643-4">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="5963210643-5">{</span><span·class="ss">name</span><span·class="o">=</span><s[·...·truncated·by·diffoscope;·len:·250,·SHA:·147c271f3e84d22d2aadd8778b26bfbdebe7ccf646b28ba7f5c6bf9473fd7966·...·]-4">)</span><span·class="p">.</span></code></pre><h2·id="accessing-record-fields"·class="section-heading">
153 ··<a·href="#accessing-record-fields"·class="hover-link">153 ··<a·href="#accessing-record-fields"·class="hover-link">
154 ····<i·class="ri-link-m"·aria-hidden="true"></i>154 ····<i·class="ri-link-m"·aria-hidden="true"></i>
155 ··</a>155 ··</a>
156 ··<span·class="text">Accessing·Record·Fields</span>156 ··<span·class="text">Accessing·Record·Fields</span>
157 </h2>157 </h2>
158 <pre><code·class="text">Expr#Name.Field</code></pre><p>Returns·the·value·of·the·specified·field.·<code·class="inline">Expr</code>·is·to·evaluate·to·a·<code·class="inline">Name</code>158 <pre><code·class="text">Expr#Name.Field</code></pre><p>Returns·the·value·of·the·specified·field.·<code·class="inline">Expr</code>·is·to·evaluate·to·a·<code·class="inline">Name</code>
159 record.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7401414732-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7401414732-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·7e56a03242738d1ae7d7541037dd148bf222097b2dbde913d1694311f6c8444d·...·]-1">)</span><span·class="p">.</span><span·class="w">159 record.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0027729671-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0027729671-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·9c26283cda151019dc453c359e364ad458248ad4cbb01b3d41dda24668c87acf·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
160 </span><span·class="nf">get_person_name</span><span·class="p"·data-group-id="7401414732-3">(</span><span·class="n">Person</span><span·class="p"·data-group-id="7401414732-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">160 </span><span·class="nf">get_person_name</span><span·class="p"·data-group-id="0027729671-3">(</span><span·class="n">Person</span><span·class="p"·data-group-id="0027729671-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
161 ····</span><span·class="n">Person</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">.</span></code></pre><p>The·following·expression·returns·the·position·of·the·specified·field·in·the161 ····</span><span·class="n">Person</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">.</span></code></pre><p>The·following·expression·returns·the·position·of·the·specified·field·in·the
162 tuple·representation·of·the·record:</p><pre><code·class="text">#Name.Field</code></pre><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0886567652-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0886567652-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·d2a44a7df9e4b23658e0d929722425501cc348f94e673781ae53f1ffc6ce017a·...·]-1">)</span><span·class="p">.</span><span·class="w">162 tuple·representation·of·the·record:</p><pre><code·class="text">#Name.Field</code></pre><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5030456128-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5030456128-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">phone</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·a72902ba3d4b6d11539319759c628458217b61092f1e41088da0f0f0cc8feabd·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
163 </span><span·class="nf">lookup</span><span·class="p"·data-group-id="0886567652-3">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List</span><span·class="p"·data-group-id="0886567652-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">163 </span><span·class="nf">lookup</span><span·class="p"·data-group-id="5030456128-3">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List</span><span·class="p"·data-group-id="5030456128-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
164 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keyfind</span><span·class="p"·data-group-id="0886567652-4">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·63,·SHA:·b5bdc898c358398e34badd63e1cda0eb56c590b2040f28cb4140b6cf4a57a4ee·...·]-4">)</span><span·class="p">.</span></code></pre><h2·id="updating-records"·class="section-heading">164 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keyfind</span><span·class="p"·data-group-id="5030456128-4">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·63,·SHA:·cdedc92c6fc877fd1d8e2f9efab74a6d7411bf1fec4ded05c9b589142cde2100·...·]-4">)</span><span·class="p">.</span></code></pre><h2·id="updating-records"·class="section-heading">
165 ··<a·href="#updating-records"·class="hover-link">165 ··<a·href="#updating-records"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">Updating·Records</span>168 ··<span·class="text">Updating·Records</span>
169 </h2>169 </h2>
170 <pre><code·class="text">Expr#Name{Field1=Expr1,·...,·FieldK=ExprK}</code></pre><p><code·class="inline">Expr</code>·is·to·evaluate·to·a·<code·class="inline">Name</code>·record.·A·copy·of·this·record·is·returned,170 <pre><code·class="text">Expr#Name{Field1=Expr1,·...,·FieldK=ExprK}</code></pre><p><code·class="inline">Expr</code>·is·to·evaluate·to·a·<code·class="inline">Name</code>·record.·A·copy·of·this·record·is·returned,
171 with·the·value·of·each·specified·field·<code·class="inline">FieldI</code>·changed·to·the·value·of171 with·the·value·of·each·specified·field·<code·class="inline">FieldI</code>·changed·to·the·value·of
Offset 178, 51 lines modifiedOffset 178, 51 lines modified
178 ····<i·class="ri-link-m"·aria-hidden="true"></i>178 ····<i·class="ri-link-m"·aria-hidden="true"></i>
179 ··</a>179 ··</a>
180 ··<span·class="text">Records·in·Guards</span>180 ··<span·class="text">Records·in·Guards</span>
181 </h2>181 </h2>
182 <p>Since·record·expressions·are·expanded·to·tuple·expressions,·creating182 <p>Since·record·expressions·are·expanded·to·tuple·expressions,·creating
183 records·and·accessing·record·fields·are·allowed·in·guards.·However,183 records·and·accessing·record·fields·are·allowed·in·guards.·However,
184 all·subexpressions·(for·initializing·fields),·must·be·valid·guard184 all·subexpressions·(for·initializing·fields),·must·be·valid·guard
185 expressions·as·well.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle</span><span·class="p"·data-group-id="8625324785-1">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8625324785-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·442,·SHA:·ac34e1db28eada72f1fd84f206e8e7faa2c79a3bbfa2de9825793e49765e3d13·...·]-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">185 expressions·as·well.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle</span><span·class="p"·data-group-id="9627874176-1">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="9627874176-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·442,·SHA:·87c53e11bc680ea832f4dbcf3ba5882479d30a3a7f238d17eb0b1efca672db67·...·]-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
186 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">186 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
187 </span><span·class="nf">handle</span><span·class="p"·data-group-id="8625324785-3">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8625324785-3">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">running</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">187 </span><span·class="nf">handle</span><span·class="p"·data-group-id="9627874176-3">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="9627874176-3">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">running</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
188 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>There·is·also·a·type·test·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_record/2"><code·class="inline">is_record(Term,·RecordTag)</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">is_person</span><span·class="p"·data-group-id="5312408848-1">(</span><span·class="n">P</span><span·class="p"·data-group-id="5312408848-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="5312408848-2">(</s[·...·truncated·by·diffoscope;·len:·147,·SHA:·562c48fa7ca275b604530b1f7f672ea9ddffd4266f2e6c7dec88a04aa8f97489·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">188 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>There·is·also·a·type·test·BIF·<a·href="../../erts-15.2.6/doc/html/erlang.html#is_record/2"><code·class="inline">is_record(Term,·RecordTag)</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">is_person</span><span·class="p"·data-group-id="6183620895-1">(</span><span·class="n">P</span><span·class="p"·data-group-id="6183620895-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="6183620895-2">(</s[·...·truncated·by·diffoscope;·len:·147,·SHA:·7828a69358991212283c72ddf105f63bc66cebef2cc9ed10974099d78367220d·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
189 ····</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">189 ····</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
190 </span><span·class="nf">is_person</span><span·class="p"·data-group-id="5312408848-3">(</span><span·class="p">_</span><span·class="n">P</span><span·class="p"·data-group-id="5312408848-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">190 </span><span·class="nf">is_person</span><span·class="p"·data-group-id="6183620895-3">(</span><span·class="p">_</span><span·class="n">P</span><span·class="p"·data-group-id="6183620895-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
191 ····</span><span·class="ss">false</span><span·class="p">.</span></code></pre><h2·id="records-in-patterns"·class="section-heading">191 ····</span><span·class="ss">false</span><span·class="p">.</span></code></pre><h2·id="records-in-patterns"·class="section-heading">
192 ··<a·href="#records-in-patterns"·class="hover-link">192 ··<a·href="#records-in-patterns"·class="hover-link">
193 ····<i·class="ri-link-m"·aria-hidden="true"></i>193 ····<i·class="ri-link-m"·aria-hidden="true"></i>
194 ··</a>194 ··</a>
195 ··<span·class="text">Records·in·Patterns</span>195 ··<span·class="text">Records·in·Patterns</span>
196 </h2>196 </h2>
197 <p>A·pattern·that·matches·a·certain·record·is·created·in·the·same·way·as·a·record197 <p>A·pattern·that·matches·a·certain·record·is·created·in·the·same·way·as·a·record
198 is·created:</p><pre><code·class="text">#Name{Field1=Expr1,·...,·FieldK=ExprK}</code></pre><p>In·this·case,·one·or·more·of·<code·class="inline">Expr1</code>·...·<code·class="inline">ExprK</code>·can·be·unbound·variables.</p><h2·id="nested-records"·class="section-heading">198 is·created:</p><pre><code·class="text">#Name{Field1=Expr1,·...,·FieldK=ExprK}</code></pre><p>In·this·case,·one·or·more·of·<code·class="inline">Expr1</code>·...·<code·class="inline">ExprK</code>·can·be·unbound·variables.</p><h2·id="nested-records"·class="section-heading">
199 ··<a·href="#nested-records"·class="hover-link">199 ··<a·href="#nested-records"·class="hover-link">
200 ····<i·class="ri-link-m"·aria-hidden="true"></i>200 ····<i·class="ri-link-m"·aria-hidden="true"></i>
201 ··</a>201 ··</a>
202 ··<span·class="text">Nested·Records</span>202 ··<span·class="text">Nested·Records</span>
203 </h2>203 </h2>
204 <p>Assume·the·following·record·definitions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5820484270-1">(</span><span·class="ss">nrec0</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5820484270-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·132,·SHA:·8da11336f58dbe84fe65a47143c661b3b0168f2ea920a177f93d8468088acedf·...·]-1">)</span><span·class="p">.</span><span·class="w">204 <p>Assume·the·following·record·definitions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="9839855139-1">(</span><span·class="ss">nrec0</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9839855139-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·132,·SHA:·4da719bb37648a721565dfc4d714bc39d6b9fa4f55cc56e83bc7b8689e1efe1e·...·]-1">)</span><span·class="p">.</span><span·class="w">
205 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5820484270-3">(</span><span·class="ss">nrec1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5820484270-4">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·392,·SHA:·c1406a442a753e14f8675e4bd622bdd17b1f9503b69bbdb9413cfda60cdc39f0·...·]-3">)</span><span·class="p">.</span><span·class="w">205 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="9839855139-3">(</span><span·class="ss">nrec1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9839855139-4">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·392,·SHA:·ca85cbff6ab8485a8bcd1462a566967560076231248b3689186dbad30f3991f1·...·]-3">)</span><span·class="p">.</span><span·class="w">
206 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5820484270-6">(</span><span·class="ss">nrec2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5820484270-7">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·392,·SHA:·844493cd46ee894ad1eb81fba4e932b78564801d910553867306b7ef6d598671·...·]-6">)</span><span·class="p">.</span><span·class="w">206 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="9839855139-6">(</span><span·class="ss">nrec2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9839855139-7">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·392,·SHA:·2c29ce307cd80bc5c8940b1ebf15cc724e58e25f075a79a28d8f8a8d462f18ca·...·]-6">)</span><span·class="p">.</span><span·class="w">
  
207 </span><span·class="n">N2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">nrec2</span><span·class="p"·data-group-id="5820484270-9">{</span><span·class="p"·data-group-id="5820484270-9">}</span><span·class="p">,</span></code></pre><p>Accessing·or·updating·nested·records·can·be·written·without·parentheses:</p><pre><code·class="text">&quot;nested0&quot;·=·N2#nrec2.nrec1#nrec1.nrec0#nrec0.name,207 </span><span·class="n">N2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">nrec2</span><span·class="p"·data-group-id="9839855139-9">{</span><span·class="p"·data-group-id="9839855139-9">}</span><span·class="p">,</span></code></pre><p>Accessing·or·updating·nested·records·can·be·written·without·parentheses:</p><pre><code·class="text">&quot;nested0&quot;·=·N2#nrec2.nrec1#nrec1.nrec0#nrec0.name,
208 ····N0n·=·N2#nrec2.nrec1#nrec1.nrec0#nrec0{name·=·&quot;nested0a&quot;},</code></pre><p>which·is·equivalent·to:</p><pre><code·class="text">&quot;nested0&quot;·=·((N2#nrec2.nrec1)#nrec1.nrec0)#nrec0.name,208 ····N0n·=·N2#nrec2.nrec1#nrec1.nrec0#nrec0{name·=·&quot;nested0a&quot;},</code></pre><p>which·is·equivalent·to:</p><pre><code·class="text">&quot;nested0&quot;·=·((N2#nrec2.nrec1)#nrec1.nrec0)#nrec0.name,
209 N0n·=·((N2#nrec2.nrec1)#nrec1.nrec0)#nrec0{name·=·&quot;nested0a&quot;},</code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·R14,·parentheses·were·necessary·when·accessing·or·updating209 N0n·=·((N2#nrec2.nrec1)#nrec1.nrec0)#nrec0{name·=·&quot;nested0a&quot;},</code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·R14,·parentheses·were·necessary·when·accessing·or·updating
210 nested·records.</p></section><h2·id="internal-representation-of-records"·class="section-heading">210 nested·records.</p></section><h2·id="internal-representation-of-records"·class="section-heading">
211 ··<a·href="#internal-representation-of-records"·class="hover-link">211 ··<a·href="#internal-representation-of-records"·class="hover-link">
212 ····<i·class="ri-link-m"·aria-hidden="true"></i>212 ····<i·class="ri-link-m"·aria-hidden="true"></i>
213 ··</a>213 ··</a>
214 ··<span·class="text">Internal·Representation·of·Records</span>214 ··<span·class="text">Internal·Representation·of·Records</span>
215 </h2>215 </h2>
216 <p>Record·expressions·are·translated·to·tuple·expressions·during·compilation.·A216 <p>Record·expressions·are·translated·to·tuple·expressions·during·compilation.·A
217 record·defined·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5659479381-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5659479381-2">{</span><span·class="n">Field1</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span[·...·truncated·by·diffoscope;·len:·214,·SHA:·dc6d0e7dde5919c2b382214b9eac7e218a2002da0b04f48db198316f0cd926ac·...·]-1">)</span><span·class="p">.</span></code></pre><p>is·internally·represented·by·the·tuple:</p><pre><code·class="text">{Name,·Value1,·...,·ValueN}</code></pre><p>Here·each·<code·class="inline">ValueI</code>·is·the·default·value·for·<code·class="inline">FieldI</code>.</p><p>To·each·module·using·records,·a·pseudo·function·is·added·during·compilation·to217 record·defined·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="6652078582-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6652078582-2">{</span><span·class="n">Field1</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span[·...·truncated·by·diffoscope;·len:·214,·SHA:·31adef60efe5c9d9fda3cbac93be162c49cf1a8cd04d80b5f7a2e126cef26baf·...·]-1">)</span><span·class="p">.</span></code></pre><p>is·internally·represented·by·the·tuple:</p><pre><code·class="text">{Name,·Value1,·...,·ValueN}</code></pre><p>Here·each·<code·class="inline">ValueI</code>·is·the·default·value·for·<code·class="inline">FieldI</code>.</p><p>To·each·module·using·records,·a·pseudo·function·is·added·during·compilation·to
218 obtain·information·about·records:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">record_info</span><span·class="p"·data-group-id="8027724175-1">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="8027724175-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8027724175-2">[</span><span·class="n">Field</span><span·class="p"·data-group-id="8027724175-2">]</span><span·class="w"> 
219 </span><span·class="nf">record_info</span><span·class="p"·data-group-id="8027724175-3">(</span><span·class="nb">size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="8027724175-3">)</span><sp[·...·truncated·by·diffoscope;·len:·216,·SHA:·dbe5cd2b032485dac7384e2d3ff22e1357da302e3c3e9f59d7f5b684c3d56890·...·]218 obtain·information·about·records:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">record_info</span><span·class="p"·data-group-id="7983270517-1">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·303,·SHA:·fda7e58dc37aee0cbd7498be07004792955a5661de2242feec7ee37a5184a9e4·...·]
 219 </span><span·class="nf">record_info</span><span·class="p"·data-group-id="7983270517-3">(</span><span·class="nb">size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="7983270517-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Size</span></code></pre><p><code·class="inline">Size</code>·is·the·size·of·the·tuple·representation,·that·is,·one·more·than·the
220 number·of·fields.</p>220 number·of·fields.</p>
221 </div>221 </div>
  
222 <div·class="bottom-actions"·id="bottom-actions">222 <div·class="bottom-actions"·id="bottom-actions">
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271 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>271 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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223 ··<span·class="text">update</span>223 ··<span·class="text">update</span>
224 </h3>224 </h3>
225 <p>If·a·more·complex·change·has·been·made,·for·example,·a·change·to·the·format·of225 <p>If·a·more·complex·change·has·been·made,·for·example,·a·change·to·the·format·of
226 the·internal·state·of·a·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>,·simple·code·replacement·is·not·sufficient.226 the·internal·state·of·a·<a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html"><code·class="inline">gen_server</code></a>,·simple·code·replacement·is·not·sufficient.
227 Instead,·it·is·necessary·to:</p><ul><li>Suspend·the·processes·using·the·module·(to·avoid·that·they·try·to·handle·any227 Instead,·it·is·necessary·to:</p><ul><li>Suspend·the·processes·using·the·module·(to·avoid·that·they·try·to·handle·any
228 requests·before·the·code·replacement·is·completed).</li><li>Ask·them·to·transform·the·internal·state·format·and·switch·to·the·new·version228 requests·before·the·code·replacement·is·completed).</li><li>Ask·them·to·transform·the·internal·state·format·and·switch·to·the·new·version
229 of·the·module.</li><li>Remove·the·old·version.</li><li>Resume·the·processes.</li></ul><p>This·is·called·<em>synchronized·code·replacement</em>·and·for·this·the·following229 of·the·module.</li><li>Remove·the·old·version.</li><li>Resume·the·processes.</li></ul><p>This·is·called·<em>synchronized·code·replacement</em>·and·for·this·the·following
230 instructions·are·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5631091538-1">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5631091538-2">{</span><span·class="ss">advanced<[·...·truncated·by·diffoscope;·len:·176,·SHA:·2c1f1a013af7e361829043dccff3d53c542491a6a748231fb816046d8adf8a29·...·]-1">}</span><span·class="w">230 instructions·are·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3727503555-1">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3727503555-2">{</span><span·class="ss">advanced<[·...·truncated·by·diffoscope;·len:·176,·SHA:·c2945cea9269e8cfd599326425daa8141cf4ac357b2bf01a94a367cd4268bf19·...·]-1">}</span><span·class="w">
231 </span><span·class="p"·data-group-id="5631091538-3">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="5631091538-3">}</span></code></pre><p><code·class="inline">update</code>·with·argument·<code·class="inline">{advanced,Extra}</code>·is·used·when·changing·the·internal231 </span><span·class="p"·data-group-id="3727503555-3">{</span><span·class="ss">update</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="3727503555-3">}</span></code></pre><p><code·class="inline">update</code>·with·argument·<code·class="inline">{advanced,Extra}</code>·is·used·when·changing·the·internal
232 state·of·a·behaviour·as·described·above.·It·causes·behaviour·processes·to·call232 state·of·a·behaviour·as·described·above.·It·causes·behaviour·processes·to·call
233 the·callback·function·<code·class="inline">code_change/3</code>,·passing·the·term·<code·class="inline">Extra</code>·and·some·other233 the·callback·function·<code·class="inline">code_change/3</code>,·passing·the·term·<code·class="inline">Extra</code>·and·some·other
234 information·as·arguments.·See·the·manual·pages·for·the·respective·behaviours·and234 information·as·arguments.·See·the·manual·pages·for·the·respective·behaviours·and
235 <a·href="appup_cookbook.html#int_state">Appup·Cookbook</a>.</p><p><code·class="inline">update</code>·with·argument·<code·class="inline">supervisor</code>·is·used·when·changing·the·start235 <a·href="appup_cookbook.html#int_state">Appup·Cookbook</a>.</p><p><code·class="inline">update</code>·with·argument·<code·class="inline">supervisor</code>·is·used·when·changing·the·start
236 specification·of·a·supervisor.·See·<a·href="appup_cookbook.html#sup">Appup·Cookbook</a>.</p><p>When·a·module·is·to·be·updated,·the·release·handler·finds·which·processes·that236 specification·of·a·supervisor.·See·<a·href="appup_cookbook.html#sup">Appup·Cookbook</a>.</p><p>When·a·module·is·to·be·updated,·the·release·handler·finds·which·processes·that
237 are·<em>using</em>·the·module·by·traversing·the·supervision·tree·of·each·running237 are·<em>using</em>·the·module·by·traversing·the·supervision·tree·of·each·running
238 application·and·checking·all·the·child·specifications:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0683124151-1">{</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartFunc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Restart</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·222,·SHA:·ab0a4151a3aed8d51fb1821f7039434299c1c953ffb175e1334e2f4a452455e4·...·]-1">}</span></code></pre><p>A·process·uses·a·module·if·the·name·is·listed·in·<code·class="inline">Modules</code>·in·the·child238 application·and·checking·all·the·child·specifications:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8424904162-1">{</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StartFunc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Restart</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·222,·SHA:·d73907738f27e49d4dd6b6d0745e3f9144ad3ea053272b9775e483faec9def3c·...·]-1">}</span></code></pre><p>A·process·uses·a·module·if·the·name·is·listed·in·<code·class="inline">Modules</code>·in·the·child
239 specification·for·the·process.</p><p>If·<code·class="inline">Modules=dynamic</code>,·which·is·the·case·for·event·managers,·the·event·manager239 specification·for·the·process.</p><p>If·<code·class="inline">Modules=dynamic</code>,·which·is·the·case·for·event·managers,·the·event·manager
240 process·informs·the·release·handler·about·the·list·of·currently·installed·event240 process·informs·the·release·handler·about·the·list·of·currently·installed·event
241 handlers·(<code·class="inline">gen_event</code>),·and·it·is·checked·if·the·module·name·is·in·this·list241 handlers·(<code·class="inline">gen_event</code>),·and·it·is·checked·if·the·module·name·is·in·this·list
242 instead.</p><p>The·release·handler·suspends,·asks·for·code·change,·and·resumes·processes·by242 instead.</p><p>The·release·handler·suspends,·asks·for·code·change,·and·resumes·processes·by
243 calling·the·functions·<code·class="inline">sys:suspend/1,2</code>,·<code·class="inline">sys:change_code/4,5</code>,·and243 calling·the·functions·<code·class="inline">sys:suspend/1,2</code>,·<code·class="inline">sys:change_code/4,5</code>,·and
244 <code·class="inline">sys:resume/1,2</code>,·respectively.</p><h3·id="add_module-and-delete_module"·class="section-heading">244 <code·class="inline">sys:resume/1,2</code>,·respectively.</p><h3·id="add_module-and-delete_module"·class="section-heading">
245 ··<a·href="#add_module-and-delete_module"·class="hover-link">245 ··<a·href="#add_module-and-delete_module"·class="hover-link">
246 ····<i·class="ri-link-m"·aria-hidden="true"></i>246 ····<i·class="ri-link-m"·aria-hidden="true"></i>
247 ··</a>247 ··</a>
248 ··<span·class="text">add_module·and·delete_module</span>248 ··<span·class="text">add_module·and·delete_module</span>
249 </h3>249 </h3>
250 <p>If·a·new·module·is·introduced,·the·following·instruction·is·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3309419173-1">{</span><span·class="ss">add_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data-group-id="3309419173-1">}</span></code></pre><p>This·instruction·loads·module·<code·class="inline">Module</code>.·When·running·Erlang·in250 <p>If·a·new·module·is·introduced,·the·following·instruction·is·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6103929308-1">{</span><span·class="ss">add_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data-group-id="6103929308-1">}</span></code></pre><p>This·instruction·loads·module·<code·class="inline">Module</code>.·When·running·Erlang·in
251 embedded·mode·it·is·necessary·to·use·this·this·instruction.·It·is·not251 embedded·mode·it·is·necessary·to·use·this·this·instruction.·It·is·not
252 strictly·required·when·running·Erlang·in·interactive·mode,·since·the252 strictly·required·when·running·Erlang·in·interactive·mode,·since·the
253 code·server·automatically·searches·for·and·loads·unloaded·modules.</p><p>The·opposite·of·<code·class="inline">add_module</code>·is·<code·class="inline">delete_module</code>,·which·unloads·a·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3250600504-1">{</span><span·class="nb">delete_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data-group-id="3250600504-1">}</span></code></pre><p>Any·process,·in·any·application,·with·<code·class="inline">Module</code>·as·residence·module,·is253 code·server·automatically·searches·for·and·loads·unloaded·modules.</p><p>The·opposite·of·<code·class="inline">add_module</code>·is·<code·class="inline">delete_module</code>,·which·unloads·a·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7152530690-1">{</span><span·class="nb">delete_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data-group-id="7152530690-1">}</span></code></pre><p>Any·process,·in·any·application,·with·<code·class="inline">Module</code>·as·residence·module,·is
254 killed·when·the·instruction·is·evaluated.·Therefore,·the·user·must254 killed·when·the·instruction·is·evaluated.·Therefore,·the·user·must
255 ensure·that·all·such·processes·are·terminated·before·deleting·module255 ensure·that·all·such·processes·are·terminated·before·deleting·module
256 <code·class="inline">Module</code>·to·avoid·a·situation·with·failing·supervisor·restarts.</p><h3·id="application-instructions"·class="section-heading">256 <code·class="inline">Module</code>·to·avoid·a·situation·with·failing·supervisor·restarts.</p><h3·id="application-instructions"·class="section-heading">
257 ··<a·href="#application-instructions"·class="hover-link">257 ··<a·href="#application-instructions"·class="hover-link">
258 ····<i·class="ri-link-m"·aria-hidden="true"></i>258 ····<i·class="ri-link-m"·aria-hidden="true"></i>
259 ··</a>259 ··</a>
260 ··<span·class="text">Application·Instructions</span>260 ··<span·class="text">Application·Instructions</span>
Offset 341, 60 lines modifiedOffset 341, 60 lines modified
341 <code·class="inline">.app</code>·file.</li><li>Each·<code·class="inline">UpFromVsn</code>·is·a·previous·version·of·the·application·to·upgrade·from.</li><li>Each·<code·class="inline">DownToVsn</code>·is·a·previous·version·of·the·application·to·downgrade·to.</li><li>Each·<code·class="inline">Instructions</code>·is·a·list·of·release·handling·instructions.</li></ul><p><code·class="inline">UpFromVsn</code>·and·<code·class="inline">DownToVsn</code>·can·also·be·specified·as·regular·expressions.·For341 <code·class="inline">.app</code>·file.</li><li>Each·<code·class="inline">UpFromVsn</code>·is·a·previous·version·of·the·application·to·upgrade·from.</li><li>Each·<code·class="inline">DownToVsn</code>·is·a·previous·version·of·the·application·to·downgrade·to.</li><li>Each·<code·class="inline">Instructions</code>·is·a·list·of·release·handling·instructions.</li></ul><p><code·class="inline">UpFromVsn</code>·and·<code·class="inline">DownToVsn</code>·can·also·be·specified·as·regular·expressions.·For
342 more·information·about·the·syntax·and·contents·of·the·<code·class="inline">.appup</code>·file,·see342 more·information·about·the·syntax·and·contents·of·the·<code·class="inline">.appup</code>·file,·see
343 <a·href="../../lib/sasl-4.2.2/doc/html/appup.html"><code·class="inline">appup</code></a>·in·SASL.</p><p><a·href="appup_cookbook.html">Appup·Cookbook</a>·includes·examples·of·<code·class="inline">.appup</code>·files·for343 <a·href="../../lib/sasl-4.2.2/doc/html/appup.html"><code·class="inline">appup</code></a>·in·SASL.</p><p><a·href="appup_cookbook.html">Appup·Cookbook</a>·includes·examples·of·<code·class="inline">.appup</code>·files·for
344 typical·upgrade/downgrade·cases.</p><p><em>Example:</em>·Consider·the·release·<code·class="inline">ch_rel-1</code>·from344 typical·upgrade/downgrade·cases.</p><p><em>Example:</em>·Consider·the·release·<code·class="inline">ch_rel-1</code>·from
345 <a·href="release_structure.html#ch_rel">Releases</a>.·Assume·you·want·to·add·a·function345 <a·href="release_structure.html#ch_rel">Releases</a>.·Assume·you·want·to·add·a·function
346 <code·class="inline">available/0</code>·to·server·<code·class="inline">ch3</code>,·which·returns·the·number·of·available·channels346 <code·class="inline">available/0</code>·to·server·<code·class="inline">ch3</code>,·which·returns·the·number·of·available·channels
347 (when·trying·out·the·example,·make·the·change·in·a·copy·of·the·original347 (when·trying·out·the·example,·make·the·change·in·a·copy·of·the·original
348 directory,·to·ensure·that·the·first·version·is·still·available):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3741257045-1">(</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3741257045-1">)</span><span·class="p">.</span><span·class="w">348 directory,·to·ensure·that·the·first·version·is·still·available):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4602779313-1">(</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4602779313-1">)</span><span·class="p">.</span><span·class="w">
349 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="3741257045-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="3741257045-2">)</span><span·class="p">.</span><span·class="w">349 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="4602779313-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="4602779313-2">)</span><span·class="p">.</span><span·class="w">
350 </span><span·class="w">350 </span><span·class="w">
351 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3741257045-3">(</span><span·class="p"·data-group-id="3741257045-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3741257045-4">]</span><span·class="p"·data-group-id="3741257045-3">)</span><span·class="p">.</span><span·class="w">351 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4602779313-3">(</span><span·class="p"·data-group-id="4602779313-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4602779313-4">]</span><span·class="p"·data-group-id="4602779313-3">)</span><span·class="p">.</span><span·class="w">
352 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3741257045-5">(</span><span·class="p"·data-group-id="3741257045-6">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·a1745b7bc8e31d7be203548265d70b06dcdf76d6483d0897f00af34c68883aea·...·]-5">)</span><span·class="p">.</span><span·class="w">352 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4602779313-5">(</span><span·class="p"·data-group-id="4602779313-6">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">free</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·7c2ad0308cdff92824f1904abf484f1e932228695c297ea05b68f2b2adc0657e·...·]-5">)</span><span·class="p">.</span><span·class="w">
353 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3741257045-7">(</span><span·class="p"·data-group-id="3741257045-8">[</span><span·class="ss">available</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="3741257045-8">]</span><span·class="p"·data-group-id="3741257045-7">)</span><span·class="p">.</span><span·class="w">353 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4602779313-7">(</span><span·class="p"·data-group-id="4602779313-8">[</span><span·class="ss">available</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4602779313-8">]</span><span·class="p"·data-group-id="4602779313-7">)</span><span·class="p">.</span><span·class="w">
354 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3741257045-9">(</span><span·class="p"·data-group-id="3741257045-10">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</s[·...·truncated·by·diffoscope;·len:·256,·SHA:·eba0bbf4bc88a02fa88d2a5ba1478ba278faeb8a4d62c918f890e5ffe66ddf3a·...·]-9">)</span><span·class="p">.</span><span·class="w">354 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4602779313-9">(</span><span·class="p"·data-group-id="4602779313-10">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</s[·...·truncated·by·diffoscope;·len:·256,·SHA:·7496b23b59ce84af7d1acb0b7138e62cbb604c5a49576c376d0aa54318ed7053·...·]-9">)</span><span·class="p">.</span><span·class="w">
  
355 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="3741257045-11">(</span><span·class="p"·data-group-id="3741257045-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">355 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="4602779313-11">(</span><span·class="p"·data-group-id="4602779313-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
356 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="3741257045-12">(</span><span·class="p"·data-group-id="3741257045-13">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3741257045-13">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·407,·SHA:·18b8ec43fc85ce35f99901a05910275e3e8455548489f11da995fb7a8b19bd00·...·]-12">)</span><span·class="p">.</span><span·class="w">356 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="4602779313-12">(</span><span·class="p"·data-group-id="4602779313-13">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4602779313-13">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·407,·SHA:·36f18054e9813e7e5402152d637ff45c01d9506b19d26dc31e82cab0607070e2·...·]-12">)</span><span·class="p">.</span><span·class="w">
  
357 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="3741257045-16">(</span><span·class="p"·data-group-id="3741257045-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">357 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="4602779313-16">(</span><span·class="p"·data-group-id="4602779313-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
358 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3741257045-17">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="3741257045-17">)</span><span·class="p">.</span><span·class="w">358 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="4602779313-17">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="4602779313-17">)</span><span·class="p">.</span><span·class="w">
  
359 </span><span·class="nf">free</span><span·class="p"·data-group-id="3741257045-18">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="3741257045-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">359 </span><span·class="nf">free</span><span·class="p"·data-group-id="4602779313-18">(</span><span·class="n">Ch</span><span·class="p"·data-group-id="4602779313-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
360 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="3741257045-19">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3741257045-20">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><sp[·...·truncated·by·diffoscope;·len:·92,·SHA:·b84c831770d176e3ae51eb93856eee5bb19fe732130a302e78214072e26fada1·...·]-19">)</span><span·class="p">.</span><span·class="w">360 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="4602779313-19">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4602779313-20">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><sp[·...·truncated·by·diffoscope;·len:·92,·SHA:·3da7cd4567ecb1a00cea88f2bd728dc7730e346d2a92171e00766343c6c8c53e·...·]-19">)</span><span·class="p">.</span><span·class="w">
  
361 </span><span·class="nf">available</span><span·class="p"·data-group-id="3741257045-21">(</span><span·class="p"·data-group-id="3741257045-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">361 </span><span·class="nf">available</span><span·class="p"·data-group-id="4602779313-21">(</span><span·class="p"·data-group-id="4602779313-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
362 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3741257045-22">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">available</span><span·class="p"·data-group-id="3741257045-22">)</span><span·class="p">.</span><span·class="w">362 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="4602779313-22">(</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">available</span><span·class="p"·data-group-id="4602779313-22">)</span><span·class="p">.</span><span·class="w">
  
363 </span><span·class="nf">init</span><span·class="p"·data-group-id="3741257045-23">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="3741257045-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">363 </span><span·class="nf">init</span><span·class="p"·data-group-id="4602779313-23">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="4602779313-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
364 ····</span><span·class="p"·data-group-id="3741257045-24">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="3741257045-25">(</span><span·class="p"·data-group-id="3741257045-25">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·5db81252d1a4fe2b42390f37b9e19f36e6ac9fae67c4c9075fd2fda3dcea3bc8·...·]-24">}</span><span·class="p">.</span><span·class="w">364 ····</span><span·class="p"·data-group-id="4602779313-24">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">channels</span><span·class="p"·data-group-id="4602779313-25">(</span><span·class="p"·data-group-id="4602779313-25">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·7627079074392d7f10588c9baa91654d62c7856d899d50e1941745a382975258·...·]-24">}</span><span·class="p">.</span><span·class="w">
  
365 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3741257045-26">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·a0d42f787c9ec6679e7bccb875bb218978ea13b591c9b82cb7da2c946ee2d9ab·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">365 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="4602779313-26">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·983ed3a6e966704927c024265dc2837a5625b8f668a69fc684329333fbc9e904·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
366 ····</span><span·class="p"·data-group-id="3741257045-27">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3741257045-27">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·143,·SHA:·ef9917ad39d15e88d2c4ffb76796069d39304c3636373684937c12c46238fe53·...·]-28">)</span><span·class="p">,</span><span·class="w">366 ····</span><span·class="p"·data-group-id="4602779313-27">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="4602779313-27">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·143,·SHA:·6c4577e91b588debbbd0f5a8f8ba686f2505153b41a5c32fd0ef5c6be0a75e84·...·]-28">)</span><span·class="p">,</span><span·class="w">
367 ····</span><span·class="p"·data-group-id="3741257045-29">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3741257045-29">}</span><span·class="p">;</span><span·class="w">367 ····</span><span·class="p"·data-group-id="4602779313-29">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="4602779313-29">}</span><span·class="p">;</span><span·class="w">
368 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3741257045-30">(</span><span·class="ss">available</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·14,·SHA:·5028be5572a1b0bf1336129564ac09935849d320678486577c5a74723de1098d·...·]-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">368 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="4602779313-30">(</span><span·class="ss">available</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·14,·SHA:·5f1a635d20351016c69e5eaa3aaa6fb828316fe7533f1d64ab0b11aff0a5c165·...·]-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
369 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">available</span><span·class="p"·data-group-id="3741257045-31">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="3741257045-31">)</span><span·class="p">,</span><span·class="w">369 ····</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">available</span><span·class="p"·data-group-id="4602779313-31">(</span><span·class="n">Chs</span><span·class="p"·data-group-id="4602779313-31">)</span><span·class="p">,</span><span·class="w">
370 ····</span><span·class="p"·data-group-id="3741257045-32">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="3741257045-32">}</span><span·class="p">.</span><span·class="w">370 ····</span><span·class="p"·data-group-id="4602779313-32">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="4602779313-32">}</span><span·class="p">.</span><span·class="w">
  
371 </span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="3741257045-33">(</span><span·class="p"·data-group-id="3741257045-34">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="3741257045-34">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·996c7948b256fafcbb5449771aa9cd0d50da5923309cbbc49c691a04dc872ff2·...·]-33">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">371 </span><span·class="nf">handle_cast</span><span·class="p"·data-group-id="4602779313-33">(</span><span·class="p"·data-group-id="4602779313-34">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ch</span><span·class="p"·data-group-id="4602779313-34">}</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·91,·SHA:·bad955fa0e8f531450670c022b6c932281bf84550d00c88fd8c055b9f01b4fde·...·]-33">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
372 ····</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="3741257045-35">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="3741257045-35">)</span><span·class="p">,</span><span·class="w">372 ····</span><span·class="n">Chs2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="4602779313-35">(</span><span·class="n">Ch</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs</span><span·class="p"·data-group-id="4602779313-35">)</span><span·class="p">,</span><span·class="w">
373 ····</span><span·class="p"·data-group-id="3741257045-36">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="3741257045-36">}</span><span·class="p">.</span></code></pre><p>A·new·version·of·the·<code·class="inline">ch_app.app</code>·file·must·now·be·created,·where·the·version·is373 ····</span><span·class="p"·data-group-id="4602779313-36">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Chs2</span><span·class="p"·data-group-id="4602779313-36">}</span><span·class="p">.</span></code></pre><p>A·new·version·of·the·<code·class="inline">ch_app.app</code>·file·must·now·be·created,·where·the·version·is
374 updated:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3531988104-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">374 updated:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4908187706-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">
375 ·</span><span·class="p"·data-group-id="3531988104-2">[</span><span·class="p"·data-group-id="3531988104-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="3531988104-3">}</span><span·class="p">,</span><span·class="w">375 ·</span><span·class="p"·data-group-id="4908187706-2">[</span><span·class="p"·data-group-id="4908187706-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="4908187706-3">}</span><span·class="p">,</span><span·class="w">
376 ··</span><span·class="p"·data-group-id="3531988104-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2&quot;</span><span·class="p"·data-group-id="3531988104-4">}</span><span·class="p">,</span><span·class="w">376 ··</span><span·class="p"·data-group-id="4908187706-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2&quot;</span><span·class="p"·data-group-id="4908187706-4">}</span><span·class="p">,</span><span·class="w">
377 ··</span><span·class="p"·data-group-id="3531988104-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3531988104-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·175,·SHA:·7a5c8804006fad9bce7efc20bc43497121270bceb1e583f604212aa5cc8f368a·...·]-5">}</span><span·class="p">,</span><span·class="w">377 ··</span><span·class="p"·data-group-id="4908187706-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4908187706-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·175,·SHA:·a1016e27ba69a2d2d28d38b10969683f8b1f3235b35b2158b2111e47080c958e·...·]-5">}</span><span·class="p">,</span><span·class="w">
378 ··</span><span·class="p"·data-group-id="3531988104-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3531988104-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3531988104-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·acdc49857b4129987f97050585e035ba2f22eddc612218273ab203d56bf7c353·...·]-7">}</span><span·class="p">,</span><span·class="w">378 ··</span><span·class="p"·data-group-id="4908187706-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4908187706-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4908187706-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·f4d5c3bf04e6de22d1007d5925657388efbfc67e85bf1de2bb50e3e44c8a5c06·...·]-7">}</span><span·class="p">,</span><span·class="w">
379 ··</span><span·class="p"·data-group-id="3531988104-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3531988104-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·183,·SHA:·9c4501ef1de6282234b7b3c8c5366897a05264073024024a4b621b955a9072b7·...·]-9">}</span><span·class="p">,</span><span·class="w">379 ··</span><span·class="p"·data-group-id="4908187706-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4908187706-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·183,·SHA:·0c5b7925899fd61b9b573d4451a4fc6f59631c73d76f6f32d2ef1afb4f8a4294·...·]-9">}</span><span·class="p">,</span><span·class="w">
380 ··</span><span·class="p"·data-group-id="3531988104-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3531988104-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="3531988104-13">[</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·b0ba08992245be421cdec4129f3fbf59b8fbaee425e588cd30dbb3c1c8689033·...·]-11">}</span><span·class="w">380 ··</span><span·class="p"·data-group-id="4908187706-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4908187706-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="4908187706-13">[</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·10dd443946e06b07947015a9886e66e23191cdcee9ad66f1894c1f4c4739053d·...·]-11">}</span><span·class="w">
381 ·</span><span·class="p"·data-group-id="3531988104-2">]</span><span·class="p"·data-group-id="3531988104-1">}</span><span·class="p">.</span></code></pre><p>To·upgrade·<code·class="inline">ch_app</code>·from·<code·class="inline">&quot;1&quot;</code>·to·<code·class="inline">&quot;2&quot;</code>·(and·to·downgrade·from·<code·class="inline">&quot;2&quot;</code>·to·<code·class="inline">&quot;1&quot;</code>),381 ·</span><span·class="p"·data-group-id="4908187706-2">]</span><span·class="p"·data-group-id="4908187706-1">}</span><span·class="p">.</span></code></pre><p>To·upgrade·<code·class="inline">ch_app</code>·from·<code·class="inline">&quot;1&quot;</code>·to·<code·class="inline">&quot;2&quot;</code>·(and·to·downgrade·from·<code·class="inline">&quot;2&quot;</code>·to·<code·class="inline">&quot;1&quot;</code>),
382 you·only·need·to·load·the·new·(old)·version·of·the·<code·class="inline">ch3</code>·callback·module.·Create382 you·only·need·to·load·the·new·(old)·version·of·the·<code·class="inline">ch3</code>·callback·module.·Create
383 the·application·upgrade·file·<code·class="inline">ch_app.appup</code>·in·the·<code·class="inline">ebin</code>·directory:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7485263008-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">383 the·application·upgrade·file·<code·class="inline">ch_app.appup</code>·in·the·<code·class="inline">ebin</code>·directory:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6067876551-1">{</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">
384 ·</span><span·class="p"·data-group-id="7485263008-2">[</span><span·class="p"·data-group-id="7485263008-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7485263008-4">[</span><span·class="p"·data-group-id="7485263008-5"[·...·truncated·by·diffoscope;·len:·319,·SHA:·01c6b01123f3bb551a62e131275f0b721bcfd58d49890d0f7b676419608383db·...·]-2">]</span><span·class="p">,</span><span·class="w">384 ·</span><span·class="p"·data-group-id="6067876551-2">[</span><span·class="p"·data-group-id="6067876551-3">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6067876551-4">[</span><span·class="p"·data-group-id="6067876551-5"[·...·truncated·by·diffoscope;·len:·319,·SHA:·dc2a4827225b1a49a37589fb3b64e1dd4dee49faccda8aa6e58bcd611ba56a5f·...·]-2">]</span><span·class="p">,</span><span·class="w">
385 ·</span><span·class="p"·data-group-id="7485263008-6">[</span><span·class="p"·data-group-id="7485263008-7">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7485263008-8">[</span><span·class="p"·data-group-id="7485263008-9"[·...·truncated·by·diffoscope;·len:·319,·SHA:·926a4fe1c7c1b69b487948bb99cfbee7df1fe22bb573ce1a71811e13eaf50256·...·]-6">]</span><span·class="w">385 ·</span><span·class="p"·data-group-id="6067876551-6">[</span><span·class="p"·data-group-id="6067876551-7">{</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6067876551-8">[</span><span·class="p"·data-group-id="6067876551-9"[·...·truncated·by·diffoscope;·len:·319,·SHA:·d0853ae17574105a41cacfae78728a0dbb17c434b06c76cb572f07e848b95e4f·...·]-6">]</span><span·class="w">
386 </span><span·class="p"·data-group-id="7485263008-1">}</span><span·class="p">.</span></code></pre><p><a·href=""·id="relup"></a></p><h2·id="release-upgrade-file"·class="section-heading">386 </span><span·class="p"·data-group-id="6067876551-1">}</span><span·class="p">.</span></code></pre><p><a·href=""·id="relup"></a></p><h2·id="release-upgrade-file"·class="section-heading">
387 ··<a·href="#release-upgrade-file"·class="hover-link">387 ··<a·href="#release-upgrade-file"·class="hover-link">
388 ····<i·class="ri-link-m"·aria-hidden="true"></i>388 ····<i·class="ri-link-m"·aria-hidden="true"></i>
389 ··</a>389 ··</a>
390 ··<span·class="text">Release·Upgrade·File</span>390 ··<span·class="text">Release·Upgrade·File</span>
391 </h2>391 </h2>
392 <p>To·define·how·to·upgrade/downgrade·between·the·new·version·and·previous·versions392 <p>To·define·how·to·upgrade/downgrade·between·the·new·version·and·previous·versions
393 of·a·release,·a·<em>release·upgrade·file</em>,·or·in·short·<code·class="inline">.relup</code>·file,·is·to·be393 of·a·release,·a·<em>release·upgrade·file</em>,·or·in·short·<code·class="inline">.relup</code>·file,·is·to·be
Offset 405, 22 lines modifiedOffset 405, 22 lines modified
405 are·to·be·added·and·deleted,·and·which·applications·that·must·be·upgraded·and/or405 are·to·be·added·and·deleted,·and·which·applications·that·must·be·upgraded·and/or
406 downgraded.·The·instructions·for·this·are·fetched·from·the·<code·class="inline">.appup</code>·files·and406 downgraded.·The·instructions·for·this·are·fetched·from·the·<code·class="inline">.appup</code>·files·and
407 transformed·into·a·single·list·of·low-level·instructions·in·the·right·order.</p><p>If·the·<code·class="inline">relup</code>·file·is·relatively·simple,·it·can·be·created·manually.·It·is·only407 transformed·into·a·single·list·of·low-level·instructions·in·the·right·order.</p><p>If·the·<code·class="inline">relup</code>·file·is·relatively·simple,·it·can·be·created·manually.·It·is·only
408 to·contain·low-level·instructions.</p><p>For·details·about·the·syntax·and·contents·of·the·release·upgrade·file,·see408 to·contain·low-level·instructions.</p><p>For·details·about·the·syntax·and·contents·of·the·release·upgrade·file,·see
409 <a·href="../../lib/sasl-4.2.2/doc/html/relup.html"><code·class="inline">relup</code></a>·in·SASL.</p><p><em>Example,·continued·from·the·previous·section:</em>·You·have·a·new·version·&quot;2&quot;·of409 <a·href="../../lib/sasl-4.2.2/doc/html/relup.html"><code·class="inline">relup</code></a>·in·SASL.</p><p><em>Example,·continued·from·the·previous·section:</em>·You·have·a·new·version·&quot;2&quot;·of
410 <code·class="inline">ch_app</code>·and·an·<code·class="inline">.appup</code>·file.·A·new·version·of·the·<code·class="inline">.rel</code>·file·is·also·needed.410 <code·class="inline">ch_app</code>·and·an·<code·class="inline">.appup</code>·file.·A·new·version·of·the·<code·class="inline">.rel</code>·file·is·also·needed.
411 This·time·the·file·is·called·<code·class="inline">ch_rel-2.rel</code>·and·the·release·version·string·is411 This·time·the·file·is·called·<code·class="inline">ch_rel-2.rel</code>·and·the·release·version·string·is
412 changed·from·&quot;A&quot;·to·&quot;B&quot;:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7908009305-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">412 changed·from·&quot;A&quot;·to·&quot;B&quot;:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9025536621-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">
413 ·</span><span·class="p"·data-group-id="7908009305-2">{</span><span·class="s">&quot;ch_rel&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;B&quot;</span><span·class="p"·data-group-id="7908009305-2">}</span><span·class="p">,</span><span·class="w">413 ·</span><span·class="p"·data-group-id="9025536621-2">{</span><span·class="s">&quot;ch_rel&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;B&quot;</span><span·class="p"·data-group-id="9025536621-2">}</span><span·class="p">,</span><span·class="w">
414 ·</span><span·class="p"·data-group-id="7908009305-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;14.2.5&quot;</span><span·class="p"·data-group-id="7908009305-3">}</span><span·class="p">,</span><span·class="w">414 ·</span><span·class="p"·data-group-id="9025536621-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;14.2.5&quot;</span><span·class="p"·data-group-id="9025536621-3">}</span><span·class="p">,</span><span·class="w">
415 ·</span><span·class="p"·data-group-id="7908009305-4">[</span><span·class="p"·data-group-id="7908009305-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;9.2.4&quot;</span><span·class="p"·data-group-id="7908009305-5">}</span><span·class="p">,</span><span·class="w">415 ·</span><span·class="p"·data-group-id="9025536621-4">[</span><span·class="p"·data-group-id="9025536621-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;9.2.4&quot;</span><span·class="p"·data-group-id="9025536621-5">}</span><span·class="p">,</span><span·class="w">
416 ··</span><span·class="p"·data-group-id="7908009305-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.2.3&quot;</span><span·class="p"·data-group-id="7908009305-6">}</span><span·class="p">,</span><span·class="w">416 ··</span><span·class="p"·data-group-id="9025536621-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.2.3&quot;</span><span·class="p"·data-group-id="9025536621-6">}</span><span·class="p">,</span><span·class="w">
417 ··</span><span·class="p"·data-group-id="7908009305-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.2.1&quot;</span><span·class="p"·data-group-id="7908009305-7">}</span><span·class="p">,</span><span·class="w">417 ··</span><span·class="p"·data-group-id="9025536621-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.2.1&quot;</span><span·class="p"·data-group-id="9025536621-7">}</span><span·class="p">,</span><span·class="w">
418 ··</span><span·class="p"·data-group-id="7908009305-8">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2&quot;</span><span·class="p"·data-group-id="7908009305-8">}</span><span·class="p"·data-group-id="7908009305-4">]</span><span·class="w">418 ··</span><span·class="p"·data-group-id="9025536621-8">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2&quot;</span><span·class="p"·data-group-id="9025536621-8">}</span><span·class="p"·data-group-id="9025536621-4">]</span><span·class="w">
419 </span><span·class="p"·data-group-id="7908009305-1">}</span><span·class="p">.</span></code></pre><p>Now·the·<code·class="inline">relup</code>·file·can·be·generated:</p><pre><code·class="text">1&gt;·systools:make_relup(&quot;ch_rel-2&quot;,·[&quot;ch_rel-1&quot;],·[&quot;ch_rel-1&quot;]).419 </span><span·class="p"·data-group-id="9025536621-1">}</span><span·class="p">.</span></code></pre><p>Now·the·<code·class="inline">relup</code>·file·can·be·generated:</p><pre><code·class="text">1&gt;·systools:make_relup(&quot;ch_rel-2&quot;,·[&quot;ch_rel-1&quot;],·[&quot;ch_rel-1&quot;]).
420 ok</code></pre><p>This·generates·a·<code·class="inline">relup</code>·file·with·instructions·for·how·to·upgrade·from·version420 ok</code></pre><p>This·generates·a·<code·class="inline">relup</code>·file·with·instructions·for·how·to·upgrade·from·version
421 &quot;A&quot;·(&quot;ch_rel-1&quot;)·to·version·&quot;B&quot;·(&quot;ch_rel-2&quot;)·and·how·to·downgrade·from·version421 &quot;A&quot;·(&quot;ch_rel-1&quot;)·to·version·&quot;B&quot;·(&quot;ch_rel-2&quot;)·and·how·to·downgrade·from·version
422 &quot;B&quot;·to·version·&quot;A&quot;.</p><p>Both·the·old·and·new·versions·of·the·<code·class="inline">.app</code>·and·<code·class="inline">.rel</code>·files·must·be·in·the·code422 &quot;B&quot;·to·version·&quot;A&quot;.</p><p>Both·the·old·and·new·versions·of·the·<code·class="inline">.app</code>·and·<code·class="inline">.rel</code>·files·must·be·in·the·code
423 path,·as·well·as·the·<code·class="inline">.appup</code>·and·(new)·<code·class="inline">.beam</code>·files.·The·code·path·can·be423 path,·as·well·as·the·<code·class="inline">.appup</code>·and·(new)·<code·class="inline">.beam</code>·files.·The·code·path·can·be
424 extended·by·using·the·option·<code·class="inline">path</code>:</p><pre><code·class="text">1&gt;·systools:make_relup(&quot;ch_rel-2&quot;,·[&quot;ch_rel-1&quot;],·[&quot;ch_rel-1&quot;],424 extended·by·using·the·option·<code·class="inline">path</code>:</p><pre><code·class="text">1&gt;·systools:make_relup(&quot;ch_rel-2&quot;,·[&quot;ch_rel-1&quot;],·[&quot;ch_rel-1&quot;],
425 [{path,[&quot;../ch_rel-1&quot;,425 [{path,[&quot;../ch_rel-1&quot;,
426 &quot;../ch_rel-1/lib/ch_app-1/ebin&quot;]}]).426 &quot;../ch_rel-1/lib/ch_app-1/ebin&quot;]}]).
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433 <p>When·you·have·made·a·new·version·of·a·release,·a·release·package·can·be·created433 <p>When·you·have·made·a·new·version·of·a·release,·a·release·package·can·be·created
434 with·this·new·version·and·transferred·to·the·target·environment.</p><p>To·install·the·new·version·of·the·release·in·runtime,·the·<em>release434 with·this·new·version·and·transferred·to·the·target·environment.</p><p>To·install·the·new·version·of·the·release·in·runtime,·the·<em>release
435 handler</em>·is·used.·This·is·a·process·belonging·to·the·SASL·application,435 handler</em>·is·used.·This·is·a·process·belonging·to·the·SASL·application,
436 which·handles·unpacking,·installation,·and·removal·of·release436 which·handles·unpacking,·installation,·and·removal·of·release
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136 ··<a·href="#release-resource-file"·class="hover-link">136 ··<a·href="#release-resource-file"·class="hover-link">
137 ····<i·class="ri-link-m"·aria-hidden="true"></i>137 ····<i·class="ri-link-m"·aria-hidden="true"></i>
138 ··</a>138 ··</a>
139 ··<span·class="text">Release·Resource·File</span>139 ··<span·class="text">Release·Resource·File</span>
140 </h2>140 </h2>
141 <p>To·define·a·release,·create·a·<em>release·resource·file</em>,·or·in·short·a·<code·class="inline">.rel</code>141 <p>To·define·a·release,·create·a·<em>release·resource·file</em>,·or·in·short·a·<code·class="inline">.rel</code>
142 file.·In·the·file,·specify·the·name·and·version·of·the·release,·which·ERTS142 file.·In·the·file,·specify·the·name·and·version·of·the·release,·which·ERTS
143 version·it·is·based·on,·and·which·applications·it·consists·of:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1927873518-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1927873518-2">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="n">Vsn</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·273,·SHA:·ac6768fd8b832e0d0c00c26252e37d0050ff404b7e925af0d1d71993af689541·...·]-3">}</span><span·class="p">,</span><span·class="w">143 version·it·is·based·on,·and·which·applications·it·consists·of:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8324099857-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8324099857-2">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="n">Vsn</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·273,·SHA:·352b53d209052bd1265b6794cd3a436f37c7ac9af261fc782914ab4290608bbc·...·]-3">}</span><span·class="p">,</span><span·class="w">
144 ·</span><span·class="p"·data-group-id="1927873518-4">[</span><span·class="p"·data-group-id="1927873518-5">{</span><span·class="n">Application1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn1</span><span·class="p"·data-group-id="1927873518-5">}</span><span·class="p">,</span><span·class="w">144 ·</span><span·class="p"·data-group-id="8324099857-4">[</span><span·class="p"·data-group-id="8324099857-5">{</span><span·class="n">Application1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn1</span><span·class="p"·data-group-id="8324099857-5">}</span><span·class="p">,</span><span·class="w">
145 ···</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">145 ···</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
146 ··</span><span·class="p"·data-group-id="1927873518-6">{</span><span·class="n">ApplicationN</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsnN</span><span·class="p"·data-group-id="1927873518-6">}</span><span·class="p"·data-group-id="1927873518-4">]</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·b0bcce365c6207bb798fc545bd27cd679e847251e9010801bda2337638bebcba·...·]-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">Name</code>,·<code·class="inline">Vsn</code>,·<code·class="inline">EVsn</code>,·and·<code·class="inline">AppVsn</code>·are·strings.</p><p>The·file·must·be·named·<code·class="inline">Rel.rel</code>,·where·<code·class="inline">Rel</code>·is·a·unique·name.</p><p>Each·<code·class="inline">Application</code>·(atom)·and·<code·class="inline">AppVsn</code>·is·the·name·and·version·of·an·application146 ··</span><span·class="p"·data-group-id="8324099857-6">{</span><span·class="n">ApplicationN</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsnN</span><span·class="p"·data-group-id="8324099857-6">}</span><span·class="p"·data-group-id="8324099857-4">]</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·13001be757ffa755ddcc199b71742807c7fd732ce9b551aeaa884ea8c534f00f·...·]-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">Name</code>,·<code·class="inline">Vsn</code>,·<code·class="inline">EVsn</code>,·and·<code·class="inline">AppVsn</code>·are·strings.</p><p>The·file·must·be·named·<code·class="inline">Rel.rel</code>,·where·<code·class="inline">Rel</code>·is·a·unique·name.</p><p>Each·<code·class="inline">Application</code>·(atom)·and·<code·class="inline">AppVsn</code>·is·the·name·and·version·of·an·application
147 included·in·the·release.·The·minimal·release·based·on·Erlang/OTP·consists·of·the147 included·in·the·release.·The·minimal·release·based·on·Erlang/OTP·consists·of·the
148 Kernel·and·STDLIB·applications,·so·these·applications·must·be·included·in·the148 Kernel·and·STDLIB·applications,·so·these·applications·must·be·included·in·the
149 list.</p><p>If·the·release·is·to·be·upgraded,·it·must·also·include·the·SASL·application.</p><p><a·href=""·id="ch_rel"></a></p><p>Here·is·an·example·showing·the·<code·class="inline">.app</code>·file·for·a·release·of·<code·class="inline">ch_app</code>·from149 list.</p><p>If·the·release·is·to·be·upgraded,·it·must·also·include·the·SASL·application.</p><p><a·href=""·id="ch_rel"></a></p><p>Here·is·an·example·showing·the·<code·class="inline">.app</code>·file·for·a·release·of·<code·class="inline">ch_app</code>·from
150 the·<a·href="applications.html#ch_app">Applications</a>·section:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7390691747-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">150 the·<a·href="applications.html#ch_app">Applications</a>·section:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4737000761-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">
151 ·</span><span·class="p"·data-group-id="7390691747-2">[</span><span·class="p"·data-group-id="7390691747-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="7390691747-3">}</span><span·class="p">,</span><span·class="w">151 ·</span><span·class="p"·data-group-id="4737000761-2">[</span><span·class="p"·data-group-id="4737000761-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Channel·allocator&quot;</span><span·class="p"·data-group-id="4737000761-3">}</span><span·class="p">,</span><span·class="w">
152 ··</span><span·class="p"·data-group-id="7390691747-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="7390691747-4">}</span><span·class="p">,</span><span·class="w">152 ··</span><span·class="p"·data-group-id="4737000761-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="4737000761-4">}</span><span·class="p">,</span><span·class="w">
153 ··</span><span·class="p"·data-group-id="7390691747-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7390691747-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·175,·SHA:·4dc3b160e4302ffb4d9db7a01b0e09e4e3924e4c786f2b32698e0ad8910262c8·...·]-5">}</span><span·class="p">,</span><span·class="w">153 ··</span><span·class="p"·data-group-id="4737000761-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4737000761-6">[</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ch_sup<[·...·truncated·by·diffoscope;·len:·175,·SHA:·4372c1d1b08e5d04b489965f947238f6e14425557a1d612d20d16c2e149154e1·...·]-5">}</span><span·class="p">,</span><span·class="w">
154 ··</span><span·class="p"·data-group-id="7390691747-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7390691747-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="7390691747-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·b560f545301b14832a9604deb79eb0094e867317c50d7f7ff42cff6379b8d422·...·]-7">}</span><span·class="p">,</span><span·class="w">154 ··</span><span·class="p"·data-group-id="4737000761-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4737000761-8">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="4737000761-8">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·46beb5e8ccd6224b27081fd9b52771af655affb56f64bd27902f7ce3744842ed·...·]-7">}</span><span·class="p">,</span><span·class="w">
155 ··</span><span·class="p"·data-group-id="7390691747-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7390691747-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·183,·SHA:·fe087629dd5bf2df768970209c82306a4e7ba90e97dd8ea55656a8177bd67c95·...·]-9">}</span><span·class="p">,</span><span·class="w">155 ··</span><span·class="p"·data-group-id="4737000761-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4737000761-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·183,·SHA:·6f02a2ca8a42acadb935292f80f719172d761614743710e66ade37ba758d5cef·...·]-9">}</span><span·class="p">,</span><span·class="w">
156 ··</span><span·class="p"·data-group-id="7390691747-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7390691747-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="7390691747-13">[</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·d32cd9b00b8f6798f5cd5bf27a307055b93fe55a30cfb508aed1eec5d5032d48·...·]-11">}</span><span·class="w">156 ··</span><span·class="p"·data-group-id="4737000761-11">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4737000761-12">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="p"·data-group-id="4737000761-13">[</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·f33f9cf9a2127edae9e62749c8d992ed214227fd853b11b3c20338bfea44b0df·...·]-11">}</span><span·class="w">
157 ·</span><span·class="p"·data-group-id="7390691747-2">]</span><span·class="p"·data-group-id="7390691747-1">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">.rel</code>·file·must·also·contain·<code·class="inline">kernel</code>,·<code·class="inline">stdlib</code>,·and·<code·class="inline">sasl</code>,·as·these157 ·</span><span·class="p"·data-group-id="4737000761-2">]</span><span·class="p"·data-group-id="4737000761-1">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">.rel</code>·file·must·also·contain·<code·class="inline">kernel</code>,·<code·class="inline">stdlib</code>,·and·<code·class="inline">sasl</code>,·as·these
158 applications·are·required·by·<code·class="inline">ch_app</code>.·The·file·is·called·<code·class="inline">ch_rel-1.rel</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3077204630-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">158 applications·are·required·by·<code·class="inline">ch_app</code>.·The·file·is·called·<code·class="inline">ch_rel-1.rel</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0703291559-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">
159 ·</span><span·class="p"·data-group-id="3077204630-2">{</span><span·class="s">&quot;ch_rel&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id="3077204630-2">}</span><span·class="p">,</span><span·class="w">159 ·</span><span·class="p"·data-group-id="0703291559-2">{</span><span·class="s">&quot;ch_rel&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id="0703291559-2">}</span><span·class="p">,</span><span·class="w">
160 ·</span><span·class="p"·data-group-id="3077204630-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;14.2.5&quot;</span><span·class="p"·data-group-id="3077204630-3">}</span><span·class="p">,</span><span·class="w">160 ·</span><span·class="p"·data-group-id="0703291559-3">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;14.2.5&quot;</span><span·class="p"·data-group-id="0703291559-3">}</span><span·class="p">,</span><span·class="w">
161 ·</span><span·class="p"·data-group-id="3077204630-4">[</span><span·class="p"·data-group-id="3077204630-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;9.2.4&quot;</span><span·class="p"·data-group-id="3077204630-5">}</span><span·class="p">,</span><span·class="w">161 ·</span><span·class="p"·data-group-id="0703291559-4">[</span><span·class="p"·data-group-id="0703291559-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;9.2.4&quot;</span><span·class="p"·data-group-id="0703291559-5">}</span><span·class="p">,</span><span·class="w">
162 ··</span><span·class="p"·data-group-id="3077204630-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.2.3&quot;</span><span·class="p"·data-group-id="3077204630-6">}</span><span·class="p">,</span><span·class="w">162 ··</span><span·class="p"·data-group-id="0703291559-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.2.3&quot;</span><span·class="p"·data-group-id="0703291559-6">}</span><span·class="p">,</span><span·class="w">
163 ··</span><span·class="p"·data-group-id="3077204630-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.2.1&quot;</span><span·class="p"·data-group-id="3077204630-7">}</span><span·class="p">,</span><span·class="w">163 ··</span><span·class="p"·data-group-id="0703291559-7">{</span><span·class="ss">sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.2.1&quot;</span><span·class="p"·data-group-id="0703291559-7">}</span><span·class="p">,</span><span·class="w">
164 ··</span><span·class="p"·data-group-id="3077204630-8">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="3077204630-8">}</span><span·class="p"·data-group-id="3077204630-4">]</span><span·class="w">164 ··</span><span·class="p"·data-group-id="0703291559-8">{</span><span·class="ss">ch_app</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="0703291559-8">}</span><span·class="p"·data-group-id="0703291559-4">]</span><span·class="w">
165 </span><span·class="p"·data-group-id="3077204630-1">}</span><span·class="p">.</span></code></pre><p><a·href=""·id="boot"></a></p><h2·id="generating-boot-scripts"·class="section-heading">165 </span><span·class="p"·data-group-id="0703291559-1">}</span><span·class="p">.</span></code></pre><p><a·href=""·id="boot"></a></p><h2·id="generating-boot-scripts"·class="section-heading">
166 ··<a·href="#generating-boot-scripts"·class="hover-link">166 ··<a·href="#generating-boot-scripts"·class="hover-link">
167 ····<i·class="ri-link-m"·aria-hidden="true"></i>167 ····<i·class="ri-link-m"·aria-hidden="true"></i>
168 ··</a>168 ··</a>
169 ··<span·class="text">Generating·Boot·Scripts</span>169 ··<span·class="text">Generating·Boot·Scripts</span>
170 </h2>170 </h2>
171 <p><a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·in·the·SASL·application·includes·tools·to·build·and·check171 <p><a·href="../../lib/sasl-4.2.2/doc/html/systools.html"><code·class="inline">systools</code></a>·in·the·SASL·application·includes·tools·to·build·and·check
172 releases.·The·functions·read·the·<code·class="inline">.rel</code>·and·<code·class="inline">.app</code>·files·and·perform172 releases.·The·functions·read·the·<code·class="inline">.rel</code>·and·<code·class="inline">.app</code>·files·and·perform
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190 ··<a·href="#creating-a-release-package"·class="hover-link">190 ··<a·href="#creating-a-release-package"·class="hover-link">
191 ····<i·class="ri-link-m"·aria-hidden="true"></i>191 ····<i·class="ri-link-m"·aria-hidden="true"></i>
192 ··</a>192 ··</a>
193 ··<span·class="text">Creating·a·Release·Package</span>193 ··<span·class="text">Creating·a·Release·Package</span>
194 </h2>194 </h2>
195 <p>The·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html#make_tar/2"><code·class="inline">systools:make_tar/1,2</code></a>·function·takes·a195 <p>The·<a·href="../../lib/sasl-4.2.2/doc/html/systools.html#make_tar/2"><code·class="inline">systools:make_tar/1,2</code></a>·function·takes·a
196 <code·class="inline">.rel</code>·file·as·input·and·creates·a·zipped·tar·file·with·the·code·for196 <code·class="inline">.rel</code>·file·as·input·and·creates·a·zipped·tar·file·with·the·code·for
197 the·specified·applications,·a·<em>release·package</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">systools</span><span·class="p">:</span><span·class="nf">make_script</span><span·class="p"·data-group-id="2959446229-1">(</span><span·class="s">&quot;ch_rel-1&quot;</span><span·class="p"·data-group-id="2959446229-1">)</span><span·class="p">.</span><span·class="w">197 the·specified·applications,·a·<em>release·package</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">systools</span><span·class="p">:</span><span·class="nf">make_script</span><span·class="p"·data-group-id="2660679799-1">(</span><span·class="s">&quot;ch_rel-1&quot;</span><span·class="p"·data-group-id="2660679799-1">)</span><span·class="p">.</span><span·class="w">
198 </span><span·class="ss">ok</span><span·class="gp·unselectable">198 </span><span·class="ss">ok</span><span·class="gp·unselectable">
199 2&gt;·</span><span·class="nc">systools</span><span·class="p">:</span><span·class="nf">make_tar</span><span·class="p"·data-group-id="2959446229-2">(</span><span·class="s">&quot;ch_rel-1&quot;</span><span·class="p"·data-group-id="2959446229-2">)</span><span·class="p">.</span><span·class="w">199 2&gt;·</span><span·class="nc">systools</span><span·class="p">:</span><span·class="nf">make_tar</span><span·class="p"·data-group-id="2660679799-2">(</span><span·class="s">&quot;ch_rel-1&quot;</span><span·class="p"·data-group-id="2660679799-2">)</span><span·class="p">.</span><span·class="w">
200 </span><span·class="ss">ok</span></code></pre><p>The·release·package·by·default·contains:</p><ul><li>The·<code·class="inline">.app</code>·files</li><li>The·<code·class="inline">.rel</code>·file</li><li>The·object·code·for·all·applications,·structured·according·to·the200 </span><span·class="ss">ok</span></code></pre><p>The·release·package·by·default·contains:</p><ul><li>The·<code·class="inline">.app</code>·files</li><li>The·<code·class="inline">.rel</code>·file</li><li>The·object·code·for·all·applications,·structured·according·to·the
201 <a·href="applications.html#app_dir">application·directory·structure</a></li><li>The·binary·boot·script·renamed·to·<code·class="inline">start.boot</code></li></ul><pre><code·class="text">%·tar·tf·ch_rel-1.tar201 <a·href="applications.html#app_dir">application·directory·structure</a></li><li>The·binary·boot·script·renamed·to·<code·class="inline">start.boot</code></li></ul><pre><code·class="text">%·tar·tf·ch_rel-1.tar
202 lib/kernel-9.2.4/ebin/kernel.app202 lib/kernel-9.2.4/ebin/kernel.app
203 lib/kernel-9.2.4/ebin/application.beam203 lib/kernel-9.2.4/ebin/application.beam
204 ...204 ...
205 lib/stdlib-5.2.3/ebin/stdlib.app205 lib/stdlib-5.2.3/ebin/stdlib.app
206 lib/stdlib-5.2.3/ebin/argparse.beam206 lib/stdlib-5.2.3/ebin/argparse.beam
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351 ······<p·class="built-using">351 ······<p·class="built-using">
352 ········Built·using352 ········Built·using
353 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the353 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
354 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>354 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
355 ······</p>355 ······</p>
356 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>356 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
357 ····</footer>357 ····</footer>
358 ··</div>358 ··</div>
359 </main>359 </main>
360 </div>360 </div>
361 <script>361 <script>
362 ··function·mermaidLoaded()·{362 ··function·mermaidLoaded()·{
363 ····mermaid.initialize({363 ····mermaid.initialize({
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128 </h2>128 </h2>
129 <p>Before·improving·the·messenger·program,·let·us·look·at·some·general·principles,129 <p>Before·improving·the·messenger·program,·let·us·look·at·some·general·principles,
130 using·the·ping·pong·program·as·an·example.·Recall·that·when·&quot;ping&quot;·finishes,·it130 using·the·ping·pong·program·as·an·example.·Recall·that·when·&quot;ping&quot;·finishes,·it
131 tells·&quot;pong&quot;·that·it·has·done·so·by·sending·the·atom·<code·class="inline">finished</code>·as·a·message·to131 tells·&quot;pong&quot;·that·it·has·done·so·by·sending·the·atom·<code·class="inline">finished</code>·as·a·message·to
132 &quot;pong&quot;·so·that·&quot;pong&quot;·can·also·finish.·Another·way·to·let·&quot;pong&quot;·finish·is·to132 &quot;pong&quot;·so·that·&quot;pong&quot;·can·also·finish.·Another·way·to·let·&quot;pong&quot;·finish·is·to
133 make·&quot;pong&quot;·exit·if·it·does·not·receive·a·message·from·ping·within·a·certain133 make·&quot;pong&quot;·exit·if·it·does·not·receive·a·message·from·ping·within·a·certain
134 time.·This·can·be·done·by·adding·a·<em>time-out</em>·to·<code·class="inline">pong</code>·as·shown·in·the134 time.·This·can·be·done·by·adding·a·<em>time-out</em>·to·<code·class="inline">pong</code>·as·shown·in·the
135 following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4035040941-1">(</span><span·class="ss">tut19</span><span·class="p"·data-group-id="4035040941-1">)</span><span·class="p">.</span><span·class="w">135 following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7327828381-1">(</span><span·class="ss">tut19</span><span·class="p"·data-group-id="7327828381-1">)</span><span·class="p">.</span><span·class="w">
136 </span><span·class="w">136 </span><span·class="w">
137 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4035040941-2">(</span><span·class="p"·data-group-id="4035040941-3">[</span><span·class="ss">start_ping</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_pong</span><span·class="p">[·...·truncated·by·diffoscope;·len:·377,·SHA:·255dd594c23a102447ad756b2b9ca14a034a665fc8b3564c293b609f2dc98b72·...·]1-2">)</span><span·class="p">.</span><span·class="w">137 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7327828381-2">(</span><span·class="p"·data-group-id="7327828381-3">[</span><span·class="ss">start_ping</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_pong</span><span·class="p">[·...·truncated·by·diffoscope;·len:·377,·SHA:·714d3dd536f7ec4a08390455d1944634cf11144a0a72c82c282a8b0a44adf6cb·...·]1-2">)</span><span·class="p">.</span><span·class="w">
  
138 </span><span·class="nf">ping</span><span·class="p"·data-group-id="4035040941-4">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="4035040941-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 </span><span·class="nf">ping</span><span·class="p"·data-group-id="7327828381-4">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="7327828381-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4035040941-5">(</span><span·class="s">&quot;ping·finished</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4035040941-6">[</span><span·class="p"·data-group-id="40350[·...·truncated·by·diffoscope;·len:·57,·SHA:·bbd7378700e25566b609a3261e5f316c514be72709203030e4f6264c532eec83·...·]1-5">)</span><span·class="p">;</span><span·class="w">139 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7327828381-5">(</span><span·class="s">&quot;ping·finished</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7327828381-6">[</span><span·class="p"·data-group-id="73278[·...·truncated·by·diffoscope;·len:·57,·SHA:·6cb62157aeb41bee36ce1b567444f6c74218f36b5d88e0cf2acc00c3cb1c63a4·...·]1-5">)</span><span·class="p">;</span><span·class="w">
  
140 </span><span·class="nf">ping</span><span·class="p"·data-group-id="4035040941-7">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="4035040941-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">140 </span><span·class="nf">ping</span><span·class="p"·data-group-id="7327828381-7">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="7327828381-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
141 ····</span><span·class="p"·data-group-id="4035040941-8">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="4035040941-8">}</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·304,·SHA:·75bc4dc126398ea5a467bd5d35839d82569913864abda3cbb9314bb96ffb4c5b·...·]1-9">}</span><span·class="p">,</span><span·class="w">141 ····</span><span·class="p"·data-group-id="7327828381-8">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="7327828381-8">}</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·304,·SHA:·53d8f279f36a26a5cea80c0527903974b598dc60b064bf08b4b827940af7ac8f·...·]1-9">}</span><span·class="p">,</span><span·class="w">
142 ····</span><span·class="k">receive</span><span·class="w">142 ····</span><span·class="k">receive</span><span·class="w">
143 ········</span><span·class="ss">pong</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">143 ········</span><span·class="ss">pong</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
144 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4035040941-11">(</span><span·class="s">&quot;Ping·received·pong</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4035040941-12">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·490bd533939f7bf44e10deb65e3b5a0e0cfb5d3a6d8348dace588c9350353bc5·...·]1-11">)</span><span·class="w">144 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7327828381-11">(</span><span·class="s">&quot;Ping·received·pong</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7327828381-12">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·69bb9a8e8e833ea7a9bcf3c64740a23f1096c1a104105d1b64112e4c8a15592f·...·]1-11">)</span><span·class="w">
145 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">145 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
146 ····</span><span·class="nf">ping</span><span·class="p"·data-group-id="4035040941-13">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="4[·...·truncated·by·diffoscope;·len:·8,·SHA:·e897171a9897868288a9db38704748c38602555a09ce48d0b55337507b07a89b·...·]1-13">)</span><span·class="p">.</span><span·class="w">146 ····</span><span·class="nf">ping</span><span·class="p"·data-group-id="7327828381-13">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="7[·...·truncated·by·diffoscope;·len:·8,·SHA:·337810d6e6085c14a63cb90b65a0b7b7313b8e251cbe264b7ffc8874e90f127c·...·]1-13">)</span><span·class="p">.</span><span·class="w">
  
147 </span><span·class="nf">pong</span><span·class="p"·data-group-id="4035040941-14">(</span><span·class="p"·data-group-id="4035040941-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">147 </span><span·class="nf">pong</span><span·class="p"·data-group-id="7327828381-14">(</span><span·class="p"·data-group-id="7327828381-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
148 ····</span><span·class="k">receive</span><span·class="w">148 ····</span><span·class="k">receive</span><span·class="w">
149 ········</span><span·class="p"·data-group-id="4035040941-15">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ping_PID</span><span·class="p"·data-group-id="4035040941-15">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">149 ········</span><span·class="p"·data-group-id="7327828381-15">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ping_PID</span><span·class="p"·data-group-id="7327828381-15">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
150 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4035040941-16">(</span><span·class="s">&quot;Pong·received·ping</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4035040941-17">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·72a87dbab6b9d4b8776d448d3ac4b0c7e0fb3d1188ec109fe57e3b6d97b04942·...·]1-16">)</span><span·class="p">,</span><span·class="w">150 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7327828381-16">(</span><span·class="s">&quot;Pong·received·ping</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7327828381-17">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·ba8d6915acbed176512f55cc6e5581cbb543d7fa76e5b8cfce7868cc5c06c7b1·...·]1-16">)</span><span·class="p">,</span><span·class="w">
151 ············</span><span·class="n">Ping_PID</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">151 ············</span><span·class="n">Ping_PID</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">
152 ············</span><span·class="nf">pong</span><span·class="p"·data-group-id="4035040941-18">(</span><span·class="p"·data-group-id="4035040941-18">)</span><span·class="w">152 ············</span><span·class="nf">pong</span><span·class="p"·data-group-id="7327828381-18">(</span><span·class="p"·data-group-id="7327828381-18">)</span><span·class="w">
153 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">153 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
154 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4035040941-19">(</span><span·class="s">&quot;Pong·timed·out</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4035040941-20">[</span><span·class="p"·data-group-id="40[·...·truncated·by·diffoscope;·len:·61,·SHA:·509f04babbced0ac640d447c2cec40358da724a4b4ed8ac02e187951e649f700·...·]1-19">)</span><span·class="w">154 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7327828381-19">(</span><span·class="s">&quot;Pong·timed·out</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7327828381-20">[</span><span·class="p"·data-group-id="73[·...·truncated·by·diffoscope;·len:·61,·SHA:·dec55ac8f0ce0ffac026f937cf0dd48bf62815b186eae40c2900436574500a0f·...·]1-19">)</span><span·class="w">
155 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">155 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
156 </span><span·class="nf">start_pong</span><span·class="p"·data-group-id="4035040941-21">(</span><span·class="p"·data-group-id="4035040941-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 </span><span·class="nf">start_pong</span><span·class="p"·data-group-id="7327828381-21">(</span><span·class="p"·data-group-id="7327828381-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="4035040941-22">(</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4035040941-23">(</span><span·class="ss">tut19</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·281,·SHA:·98098de56235bbac3210d4237a78d17935361b4631c72a5b3aec3bc608dbd40c·...·]1-22">)</span><span·class="p">.</span><span·class="w">157 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="7327828381-22">(</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7327828381-23">(</span><span·class="ss">tut19</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·281,·SHA:·b1c35c4627b9f0ea4f09d550f4987d113c6e9f07f903e5fe84796f196c4cecd8·...·]1-22">)</span><span·class="p">.</span><span·class="w">
  
158 </span><span·class="nf">start_ping</span><span·class="p"·data-group-id="4035040941-25">(</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="4035040941-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">158 </span><span·class="nf">start_ping</span><span·class="p"·data-group-id="7327828381-25">(</span><span·class="n">Pong_Node</span><span·class="p"·data-group-id="7327828381-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
159 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4035040941-26">(</span><span·class="ss">tut19</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4035040941-27">[</span><span·class="mi">3</span><[·...·truncated·by·diffoscope;·len:·173,·SHA:·7a9c64b8f5a832a23b69325cfc1eafeb852359074c531318982654ef78205646·...·]1-26">)</span><span·class="p">.</span></code></pre><p>After·this·is·compiled·and·the·file·<code·class="inline">tut19.beam</code>·is·copied·to·the·necessary159 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7327828381-26">(</span><span·class="ss">tut19</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7327828381-27">[</span><span·class="mi">3</span><[·...·truncated·by·diffoscope;·len:·173,·SHA:·522c473186d7102088381b825f6b08651e404c2b07678a4cfab928868d319b79·...·]1-26">)</span><span·class="p">.</span></code></pre><p>After·this·is·compiled·and·the·file·<code·class="inline">tut19.beam</code>·is·copied·to·the·necessary
160 directories,·the·following·is·seen·on·(pong@kosken):</p><pre><code·class="text">(pong@kosken)1&gt;·tut19:start_pong().160 directories,·the·following·is·seen·on·(pong@kosken):</p><pre><code·class="text">(pong@kosken)1&gt;·tut19:start_pong().
161 true161 true
162 Pong·received·ping162 Pong·received·ping
163 Pong·received·ping163 Pong·received·ping
164 Pong·received·ping164 Pong·received·ping
165 Pong·timed·out</code></pre><p>And·the·following·is·seen·on·(ping@gollum):</p><pre><code·class="text">(ping@gollum)1&gt;·tut19:start_ping(pong@kosken).165 Pong·timed·out</code></pre><p>And·the·following·is·seen·on·(ping@gollum):</p><pre><code·class="text">(ping@gollum)1&gt;·tut19:start_ping(pong@kosken).
166 &lt;0.36.0&gt;166 &lt;0.36.0&gt;
167 Ping·received·pong167 Ping·received·pong
168 Ping·received·pong168 Ping·received·pong
169 Ping·received·pong169 Ping·received·pong
170 ping·finished</code></pre><p>The·time-out·is·set·in:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">pong</span><span·class="p"·data-group-id="1333757580-1">(</span><span·class="p"·data-group-id="1333757580-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">170 ping·finished</code></pre><p>The·time-out·is·set·in:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">pong</span><span·class="p"·data-group-id="6854800522-1">(</span><span·class="p"·data-group-id="6854800522-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
171 ····</span><span·class="k">receive</span><span·class="w">171 ····</span><span·class="k">receive</span><span·class="w">
172 ········</span><span·class="p"·data-group-id="1333757580-2">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ping_PID</span><span·class="p"·data-group-id="1333757580-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 ········</span><span·class="p"·data-group-id="6854800522-2">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ping_PID</span><span·class="p"·data-group-id="6854800522-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1333757580-3">(</span><span·class="s">&quot;Pong·received·ping</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1333757580-4">[</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·63,·SHA:·da7dcde0c004ca81e7091a4d8d832a31b551e8f3f055a6553ab6f9bb6294dddb·...·]-3">)</span><span·class="p">,</span><span·class="w">173 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6854800522-3">(</span><span·class="s">&quot;Pong·received·ping</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6854800522-4">[</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·63,·SHA:·49bbadec6e18d3c0b3c9ef76702d9720893d2532108ca9e32175525060930efc·...·]-3">)</span><span·class="p">,</span><span·class="w">
174 ············</span><span·class="n">Ping_PID</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">174 ············</span><span·class="n">Ping_PID</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">
175 ············</span><span·class="nf">pong</span><span·class="p"·data-group-id="1333757580-5">(</span><span·class="p"·data-group-id="1333757580-5">)</span><span·class="w">175 ············</span><span·class="nf">pong</span><span·class="p"·data-group-id="6854800522-5">(</span><span·class="p"·data-group-id="6854800522-5">)</span><span·class="w">
176 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1333757580-6">(</span><span·class="s">&quot;Pong·timed·out</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1333757580-7">[</span><span·class="p"·data-group-id="1333[·...·truncated·by·diffoscope;·len:·59,·SHA:·a252ad692fc2d3c210d1ae061d6e51b8c67e50878f8aaba22af5bf1f80df0275·...·]-6">)</span><span·class="w">177 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6854800522-6">(</span><span·class="s">&quot;Pong·timed·out</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6854800522-7">[</span><span·class="p"·data-group-id="6854[·...·truncated·by·diffoscope;·len:·59,·SHA:·be93fd74814903f13705c20130159f9d7394018d1400e472a3270a09479b92a0·...·]-6">)</span><span·class="w">
178 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·time-out·(<code·class="inline">after·5000</code>)·is·started·when·<code·class="inline">receive</code>·is·entered.·The·time-out178 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·time-out·(<code·class="inline">after·5000</code>)·is·started·when·<code·class="inline">receive</code>·is·entered.·The·time-out
179 is·canceled·if·<code·class="inline">{ping,Ping_PID}</code>·is·received.·If·<code·class="inline">{ping,Ping_PID}</code>·is·not179 is·canceled·if·<code·class="inline">{ping,Ping_PID}</code>·is·received.·If·<code·class="inline">{ping,Ping_PID}</code>·is·not
180 received,·the·actions·following·the·time-out·are·done·after·5000·milliseconds.180 received,·the·actions·following·the·time-out·are·done·after·5000·milliseconds.
181 <code·class="inline">after</code>·must·be·last·in·the·<code·class="inline">receive</code>,·that·is,·preceded·by·all·other·message181 <code·class="inline">after</code>·must·be·last·in·the·<code·class="inline">receive</code>,·that·is,·preceded·by·all·other·message
182 reception·specifications·in·the·<code·class="inline">receive</code>.·It·is·also·possible·to·call·a182 reception·specifications·in·the·<code·class="inline">receive</code>.·It·is·also·possible·to·call·a
183 function·that·returned·an·integer·for·the·time-out:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">after</span><span·class="w">·</span><span·class="nf">pong_timeout</span><span·class="p"·data-group-id="6774427568-1">(</span><span·class="p"·data-group-id="6774427568-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span></code></pre><p>In·general,·there·are·better·ways·than·using·time-outs·to·supervise·parts·of·a183 function·that·returned·an·integer·for·the·time-out:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">after</span><span·class="w">·</span><span·class="nf">pong_timeout</span><span·class="p"·data-group-id="0612140014-1">(</span><span·class="p"·data-group-id="0612140014-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span></code></pre><p>In·general,·there·are·better·ways·than·using·time-outs·to·supervise·parts·of·a
184 distributed·Erlang·system.·Time-outs·are·usually·appropriate·to·supervise184 distributed·Erlang·system.·Time-outs·are·usually·appropriate·to·supervise
185 external·events,·for·example,·if·you·have·expected·a·message·from·some·external185 external·events,·for·example,·if·you·have·expected·a·message·from·some·external
186 system·within·a·specified·time.·For·example,·a·time-out·can·be·used·to·log·a186 system·within·a·specified·time.·For·example,·a·time-out·can·be·used·to·log·a
187 user·out·of·the·messenger·system·if·they·have·not·accessed·it·for,·say,·ten187 user·out·of·the·messenger·system·if·they·have·not·accessed·it·for,·say,·ten
188 minutes.</p><h2·id="error-handling"·class="section-heading">188 minutes.</p><h2·id="error-handling"·class="section-heading">
189 ··<a·href="#error-handling"·class="hover-link">189 ··<a·href="#error-handling"·class="hover-link">
190 ····<i·class="ri-link-m"·aria-hidden="true"></i>190 ····<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 209, 96 lines modifiedOffset 209, 96 lines modified
209 something·called·a·<em>signal</em>·to·all·the·processes·it·has·links·to.</p><p>The·signal·carries·information·about·the·pid·it·was·sent·from·and·the·exit209 something·called·a·<em>signal</em>·to·all·the·processes·it·has·links·to.</p><p>The·signal·carries·information·about·the·pid·it·was·sent·from·and·the·exit
210 reason.</p><p>The·default·behaviour·of·a·process·that·receives·a·normal·exit·is·to·ignore·the210 reason.</p><p>The·default·behaviour·of·a·process·that·receives·a·normal·exit·is·to·ignore·the
211 signal.</p><p>The·default·behaviour·in·the·two·other·cases·(that·is,·abnormal·exit)·above·is211 signal.</p><p>The·default·behaviour·in·the·two·other·cases·(that·is,·abnormal·exit)·above·is
212 to:</p><ul><li>Bypass·all·messages·to·the·receiving·process.</li><li>Kill·the·receiving·process.</li><li>Propagate·the·same·error·signal·to·the·links·of·the·killed·process.</li></ul><p>In·this·way·you·can·connect·all·processes·in·a·transaction·together·using·links.212 to:</p><ul><li>Bypass·all·messages·to·the·receiving·process.</li><li>Kill·the·receiving·process.</li><li>Propagate·the·same·error·signal·to·the·links·of·the·killed·process.</li></ul><p>In·this·way·you·can·connect·all·processes·in·a·transaction·together·using·links.
213 If·one·of·the·processes·exits·abnormally,·all·the·processes·in·the·transaction213 If·one·of·the·processes·exits·abnormally,·all·the·processes·in·the·transaction
214 are·killed.·As·it·is·often·wanted·to·create·a·process·and·link·to·it·at·the·same214 are·killed.·As·it·is·often·wanted·to·create·a·process·and·link·to·it·at·the·same
215 time,·there·is·a·special·BIF,·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_link/1">spawn_link</a>·that·does·the215 time,·there·is·a·special·BIF,·<a·href="../../erts-15.2.6/doc/html/erlang.html#spawn_link/1">spawn_link</a>·that·does·the
216 same·as·<code·class="inline">spawn</code>,·but·also·creates·a·link·to·the·spawned·process.</p><p>Now·an·example·of·the·ping·pong·example·using·links·to·terminate·&quot;pong&quot;:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6091815159-1">(</span><span·class="ss">tut20</span><span·class="p"·data-group-id="6091815159-1">)</span><span·class="p">.</span><span·class="w">216 same·as·<code·class="inline">spawn</code>,·but·also·creates·a·link·to·the·spawned·process.</p><p>Now·an·example·of·the·ping·pong·example·using·links·to·terminate·&quot;pong&quot;:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1366354336-1">(</span><span·class="ss">tut20</span><span·class="p"·data-group-id="1366354336-1">)</span><span·class="p">.</span><span·class="w">
217 </span><span·class="w">217 </span><span·class="w">
218 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6091815159-2">(</span><span·class="p"·data-group-id="6091815159-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">··</span><span·class="ss">ping</span><span·class="p">/</span><s[·...·truncated·by·diffoscope;·len:·242,·SHA:·b4b62a5b26d9a5a992e7e433f2d0f0ae456041a30ccf31a55e711620d0d19063·...·]-2">)</span><span·class="p">.</span><span·class="w">218 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1366354336-2">(</span><span·class="p"·data-group-id="1366354336-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">··</span><span·class="ss">ping</span><span·class="p">/</span><s[·...·truncated·by·diffoscope;·len:·242,·SHA:·7625284a2d0b706832e31cf420bf7af3c8ffdf044074e97c66884f65fa1bf607·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
219 </span><span·class="nf">ping</span><span·class="p"·data-group-id="6091815159-4">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="6091815159-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 </span><span·class="nf">ping</span><span·class="p"·data-group-id="1366354336-4">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="1366354336-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ····</span><span·class="nf">link</span><span·class="p"·data-group-id="6091815159-5">(</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="6091815159-5">)</span><span·class="p">,</span><span·class="w">220 ····</span><span·class="nf">link</span><span·class="p"·data-group-id="1366354336-5">(</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="1366354336-5">)</span><span·class="p">,</span><span·class="w">
221 ····</span><span·class="nf">ping1</span><span·class="p"·data-group-id="6091815159-6">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="6091815159-6">)</span><span·class="p">.</span><span·class="w">221 ····</span><span·class="nf">ping1</span><span·class="p"·data-group-id="1366354336-6">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="1366354336-6">)</span><span·class="p">.</span><span·class="w">
  
222 </span><span·class="nf">ping1</span><span·class="p"·data-group-id="6091815159-7">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="6091815159-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 </span><span·class="nf">ping1</span><span·class="p"·data-group-id="1366354336-7">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="1366354336-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="6091815159-8">(</span><span·class="ss">ping</span><span·class="p"·data-group-id="6091815159-8">)</span><span·class="p">;</span><span·class="w">223 ····</span><span·class="nf">exit</span><span·class="p"·data-group-id="1366354336-8">(</span><span·class="ss">ping</span><span·class="p"·data-group-id="1366354336-8">)</span><span·class="p">;</span><span·class="w">
  
224 </span><span·class="nf">ping1</span><span·class="p"·data-group-id="6091815159-9">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="6091815159-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 </span><span·class="nf">ping1</span><span·class="p"·data-group-id="1366354336-9">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="1366354336-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 ····</span><span·class="n">Pong_Pid</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6091815159-10">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6091815159-11">(</span><span·class="p"·data-group-id="6091815159-11">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·47cb76ec1eab1b4df234e591fca133bd51e79c838bcc3605578a6ec84805dedc·...·]-10">}</span><span·class="p">,</span><span·class="w">225 ····</span><span·class="n">Pong_Pid</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1366354336-10">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="1366354336-11">(</span><span·class="p"·data-group-id="1366354336-11">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·7a2595ea953a53c15fc9dfe859d7965c2a4aa78dbad5d016ecc5103104e5eb13·...·]-10">}</span><span·class="p">,</span><span·class="w">
226 ····</span><span·class="k">receive</span><span·class="w">226 ····</span><span·class="k">receive</span><span·class="w">
227 ········</span><span·class="ss">pong</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 ········</span><span·class="ss">pong</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6091815159-12">(</span><span·class="s">&quot;Ping·received·pong</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6091815159-13">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·c1687cbb5276e04622ad0bcdfa7d1953b44fddb0bafbe36ede34387a46bcfb97·...·]-12">)</span><span·class="w">228 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1366354336-12">(</span><span·class="s">&quot;Ping·received·pong</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1366354336-13">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·afc86487d9292597192d6e33202f59f5582bee7047226902a5f496c8545af46b·...·]-12">)</span><span·class="w">
229 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">229 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
230 ····</span><span·class="nf">ping1</span><span·class="p"·data-group-id="6091815159-14">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="60[·...·truncated·by·diffoscope;·len:·8,·SHA:·349485dbfa9da5676735460f1c69ca33f704171be22ffd055ac85c5c70ee28c7·...·]-14">)</span><span·class="p">.</span><span·class="w">230 ····</span><span·class="nf">ping1</span><span·class="p"·data-group-id="1366354336-14">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="13[·...·truncated·by·diffoscope;·len:·8,·SHA:·03bba836134d61164b8b47720dc3d08afb87481cf0ed51c4324855c895063999·...·]-14">)</span><span·class="p">.</span><span·class="w">
  
231 </span><span·class="nf">pong</span><span·class="p"·data-group-id="6091815159-15">(</span><span·class="p"·data-group-id="6091815159-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 </span><span·class="nf">pong</span><span·class="p"·data-group-id="1366354336-15">(</span><span·class="p"·data-group-id="1366354336-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ····</span><span·class="k">receive</span><span·class="w">232 ····</span><span·class="k">receive</span><span·class="w">
233 ········</span><span·class="p"·data-group-id="6091815159-16">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ping_PID</span><span·class="p"·data-group-id="6091815159-16">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">233 ········</span><span·class="p"·data-group-id="1366354336-16">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ping_PID</span><span·class="p"·data-group-id="1366354336-16">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
234 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6091815159-17">(</span><span·class="s">&quot;Pong·received·ping</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6091815159-18">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·51c4835a70e741033f6c7f9115e9a5b333c7bbaa0e2d18058eff38f1a0f6eee9·...·]-17">)</span><span·class="p">,</span><span·class="w">234 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1366354336-17">(</span><span·class="s">&quot;Pong·received·ping</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1366354336-18">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·446b1ab228e15ffa8dd070a0946a2e8a6f9deab9b052e37517c352d29ae92ef9·...·]-17">)</span><span·class="p">,</span><span·class="w">
235 ············</span><span·class="n">Ping_PID</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">235 ············</span><span·class="n">Ping_PID</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">
236 ············</span><span·class="nf">pong</span><span·class="p"·data-group-id="6091815159-19">(</span><span·class="p"·data-group-id="6091815159-19">)</span><span·class="w">236 ············</span><span·class="nf">pong</span><span·class="p"·data-group-id="1366354336-19">(</span><span·class="p"·data-group-id="1366354336-19">)</span><span·class="w">
237 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">237 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
238 </span><span·class="nf">start</span><span·class="p"·data-group-id="6091815159-20">(</span><span·class="n">Ping_Node</span><span·class="p"·data-group-id="6091815159-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">238 </span><span·class="nf">start</span><span·class="p"·data-group-id="1366354336-20">(</span><span·class="n">Ping_Node</span><span·class="p"·data-group-id="1366354336-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
239 ····</span><span·class="n">PongPID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="6091815159-21">(</span><span·class="ss">tut20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6091815159-22">[</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·69,·SHA:·0ec95034cdb1c132c533b20432c805bc10f955e2683989460c3d07acfdd48ad9·...·]-21">)</span><span·class="p">,</span><span·class="w">239 ····</span><span·class="n">PongPID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1366354336-21">(</span><span·class="ss">tut20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1366354336-22">[</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·69,·SHA:·dce4a63b8b56e70d140b40b0875c0fef9abba8d8ce38309e6aea5c7ba62c0907·...·]-21">)</span><span·class="p">,</span><span·class="w">
240 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="6091815159-23">(</span><span·class="n">Ping_Node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tut20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·252,·SHA:·34969ba703b7b419630634acc6d6557c7234a48a21374a0a649ef94050eacd77·...·]-23">)</span><span·class="p">.</span></code></pre><pre><code·class="text">(s1@bill)3&gt;·tut20:start(s2@kosken).240 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1366354336-23">(</span><span·class="n">Ping_Node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tut20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·252,·SHA:·f4204abedcb0b3d5524c0d164d45440d3f12e615e5833ee1433b0bf24f219b3c·...·]-23">)</span><span·class="p">.</span></code></pre><pre><code·class="text">(s1@bill)3&gt;·tut20:start(s2@kosken).
241 Pong·received·ping241 Pong·received·ping
242 &lt;3820.41.0&gt;242 &lt;3820.41.0&gt;
243 Ping·received·pong243 Ping·received·pong
244 Pong·received·ping244 Pong·received·ping
245 Ping·received·pong245 Ping·received·pong
246 Pong·received·ping246 Pong·received·ping
247 Ping·received·pong</code></pre><p>This·is·a·slight·modification·of·the·ping·pong·program·where·both·processes·are247 Ping·received·pong</code></pre><p>This·is·a·slight·modification·of·the·ping·pong·program·where·both·processes·are
248 spawned·from·the·same·<code·class="inline">start/1</code>·function,·and·the·&quot;ping&quot;·process·can·be·spawned248 spawned·from·the·same·<code·class="inline">start/1</code>·function,·and·the·&quot;ping&quot;·process·can·be·spawned
249 on·a·separate·node.·Notice·the·use·of·the·<code·class="inline">link</code>·BIF.·&quot;Ping&quot;·calls249 on·a·separate·node.·Notice·the·use·of·the·<code·class="inline">link</code>·BIF.·&quot;Ping&quot;·calls
250 <a·href="../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit(ping)</code></a>·when·it·finishes·and·this·causes·an·exit·signal·to·be250 <a·href="../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit(ping)</code></a>·when·it·finishes·and·this·causes·an·exit·signal·to·be
251 sent·to·&quot;pong&quot;,·which·also·terminates.</p><p>It·is·possible·to·modify·the·default·behaviour·of·a·process·so·that·it·does·not251 sent·to·&quot;pong&quot;,·which·also·terminates.</p><p>It·is·possible·to·modify·the·default·behaviour·of·a·process·so·that·it·does·not
252 get·killed·when·it·receives·abnormal·exit·signals.·Instead,·all·signals·are252 get·killed·when·it·receives·abnormal·exit·signals.·Instead,·all·signals·are
253 turned·into·normal·messages·on·the·format·<code·class="inline">{'EXIT',FromPID,Reason}</code>·and·added·to253 turned·into·normal·messages·on·the·format·<code·class="inline">{'EXIT',FromPID,Reason}</code>·and·added·to
254 the·end·of·the·receiving·process'·message·queue.·This·behaviour·is·set·by:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">process_flag</span><span·class="p"·data-group-id="2882346531-1">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="2882346531-1">)</span></code></pre><p>There·are·several·other·process·flags,·see·<a·href="../../erts-15.2.6/doc/html/erlang.html#process_flag/2">erlang(3)</a>.254 the·end·of·the·receiving·process'·message·queue.·This·behaviour·is·set·by:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">process_flag</span><span·class="p"·data-group-id="1953556680-1">(</span><span·class="ss">trap_exit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="1953556680-1">)</span></code></pre><p>There·are·several·other·process·flags,·see·<a·href="../../erts-15.2.6/doc/html/erlang.html#process_flag/2">erlang(3)</a>.
255 Changing·the·default·behaviour·of·a·process·in·this·way·is·usually·not·done·in255 Changing·the·default·behaviour·of·a·process·in·this·way·is·usually·not·done·in
256 standard·user·programs,·but·is·left·to·the·supervisory·programs·in·OTP.·However,256 standard·user·programs,·but·is·left·to·the·supervisory·programs·in·OTP.·However,
257 the·ping·pong·program·is·modified·to·illustrate·exit·trapping.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4675529020-1">(</span><span·class="ss">tut21</span><span·class="p"·data-group-id="4675529020-1">)</span><span·class="p">.</span><span·class="w">257 the·ping·pong·program·is·modified·to·illustrate·exit·trapping.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6676836589-1">(</span><span·class="ss">tut21</span><span·class="p"·data-group-id="6676836589-1">)</span><span·class="p">.</span><span·class="w">
258 </span><span·class="w">258 </span><span·class="w">
259 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4675529020-2">(</span><span·class="p"·data-group-id="4675529020-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">··</span><span·class="ss">ping</span><span·class="p">/</span><s[·...·truncated·by·diffoscope;·len:·242,·SHA:·45a971808523efd413fa1a936872f97c2608110fba59c104765aa639a4599b57·...·]-2">)</span><span·class="p">.</span><span·class="w">259 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6676836589-2">(</span><span·class="p"·data-group-id="6676836589-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">··</span><span·class="ss">ping</span><span·class="p">/</span><s[·...·truncated·by·diffoscope;·len:·242,·SHA:·429851bf43111204dd88363faaf972f614b87906107ad0178b3fb07931ec941b·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
260 </span><span·class="nf">ping</span><span·class="p"·data-group-id="4675529020-4">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="4675529020-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">260 </span><span·class="nf">ping</span><span·class="p"·data-group-id="6676836589-4">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pong_Pid</span><span·class="p"·data-group-id="6676836589-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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131 ······<p·class="built-using">131 ······<p·class="built-using">
132 ········Built·using132 ········Built·using
133 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the133 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
134 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>134 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
135 ······</p>135 ······</p>
136 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>136 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
137 ····</footer>137 ····</footer>
138 ··</div>138 ··</div>
139 </main>139 </main>
140 </div>140 </div>
141 <script>141 <script>
142 ··function·mermaidLoaded()·{142 ··function·mermaidLoaded()·{
143 ····mermaid.initialize({143 ····mermaid.initialize({
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128 the·order·specified·by·this·list,·and·are·terminated·in·the·reverse·order.</p><h2·id="example"·class="section-heading">128 the·order·specified·by·this·list,·and·are·terminated·in·the·reverse·order.</p><h2·id="example"·class="section-heading">
129 ··<a·href="#example"·class="hover-link">129 ··<a·href="#example"·class="hover-link">
130 ····<i·class="ri-link-m"·aria-hidden="true"></i>130 ····<i·class="ri-link-m"·aria-hidden="true"></i>
131 ··</a>131 ··</a>
132 ··<span·class="text">Example</span>132 ··<span·class="text">Example</span>
133 </h2>133 </h2>
134 <p>The·callback·module·for·a·supervisor·starting·the·server·from134 <p>The·callback·module·for·a·supervisor·starting·the·server·from
135 <a·href="gen_server_concepts.html#ex">gen_server·Behaviour</a>·can·look·as·follows:</p><p><a·href=""·id="ex"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7428972408-1">(</span><span·class="ss">ch_sup</span><span·class="p"·data-group-id="7428972408-1">)</span><span·class="p">.</span><span·class="w">135 <a·href="gen_server_concepts.html#ex">gen_server·Behaviour</a>·can·look·as·follows:</p><p><a·href=""·id="ex"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9798996117-1">(</span><span·class="ss">ch_sup</span><span·class="p"·data-group-id="9798996117-1">)</span><span·class="p">.</span><span·class="w">
136 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="7428972408-2">(</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="7428972408-2">)</span><span·class="p">.</span><span·class="w">136 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="9798996117-2">(</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="9798996117-2">)</span><span·class="p">.</span><span·class="w">
137 </span><span·class="w">137 </span><span·class="w">
138 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7428972408-3">(</span><span·class="p"·data-group-id="7428972408-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="7428972408-4">]</span><span·class="p"·data-group-id="7428972408-3">)</span><span·class="p">.</span><span·class="w"> 
139 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7428972408-5">(</span><span·class="p"·data-group-id="7428972408-6">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="7428972408-6">]</span><span·class="p"·data-group-id="7428972408-5">)</span><span·class="p">.</span><span·class="w">138 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9798996117-3">(</span><span·class="p"·data-group-id="9798996117-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="9798996117-4">]</span><span·class="p"·data-group-id="9798996117-3">)</span><span·class="p">.</span><span·class="w">
 139 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9798996117-5">(</span><span·class="p"·data-group-id="9798996117-6">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="9798996117-6">]</span><span·class="p"·data-group-id="9798996117-5">)</span><span·class="p">.</span><span·class="w">
  
140 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="7428972408-7">(</span><span·class="p"·data-group-id="7428972408-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">140 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="9798996117-7">(</span><span·class="p"·data-group-id="9798996117-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
141 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="7428972408-8">(</span><span·class="ss">ch_sup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-9">[</span><span·class="p"·data-group-id="7428972408-9">]</span><span·class="p"·data-group-id="7428972408-8">)</span><span·class="p">.</span><span·class="w">141 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="9798996117-8">(</span><span·class="ss">ch_sup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-9">[</span><span·class="p"·data-group-id="9798996117-9">]</span><span·class="p"·data-group-id="9798996117-8">)</span><span·class="p">.</span><span·class="w">
  
142 </span><span·class="nf">init</span><span·class="p"·data-group-id="7428972408-10">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="7428972408-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">142 </span><span·class="nf">init</span><span·class="p"·data-group-id="9798996117-10">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="9798996117-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
143 ····</span><span·class="n">SupFlags</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-11">#{</span><span·class="ss">strategy</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">one_for_one</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">intensity</span><span·cl[·...·truncated·by·diffoscope;·len:·313,·SHA:·abc542c6a968288a48538f5296b3c2c4ca517a2a27631275a030885136c1ce95·...·]-11">}</span><span·class="p">,</span><span·class="w">143 ····</span><span·class="n">SupFlags</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-11">#{</span><span·class="ss">strategy</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">one_for_one</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">intensity</span><span·cl[·...·truncated·by·diffoscope;·len:·313,·SHA:·73463a660248a9009e15e6aae0821b924418a887ffd5396911476c331e0af9a5·...·]-11">}</span><span·class="p">,</span><span·class="w">
144 ····</span><span·class="n">ChildSpecs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-12">[</span><span·class="p"·data-group-id="7428972408-13">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">144 ····</span><span·class="n">ChildSpecs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-12">[</span><span·class="p"·data-group-id="9798996117-13">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">
145 ····················</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-14">{</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-15">[</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·73,·SHA:·85d348f22a304c99f5c79036582cadd6e3f604eea75a28887b3096cb98ddc757·...·]-14">}</span><span·class="p">,</span><span·class="w">145 ····················</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-14">{</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-15">[</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·73,·SHA:·0a2e62bb873bafc7b7b6c0bf5f98a1388463817d28fa8e4f265f858785bae526·...·]-14">}</span><span·class="p">,</span><span·class="w">
146 ····················</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">permanent</span><span·class="p">,</span><span·class="w">146 ····················</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">permanent</span><span·class="p">,</span><span·class="w">
147 ····················</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="p">,</span><span·class="w">147 ····················</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="p">,</span><span·class="w">
148 ····················</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">worker</span><span·class="p">,</span><span·class="w">148 ····················</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">worker</span><span·class="p">,</span><span·class="w">
149 ····················</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-16">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="7428972408-16">]</span><span·class="p"·data-group-id="7428972408-13">}</span><span·class="p"·data-group-id="7428972408-12">]</span><span·class="p">,</span><span·class="w">149 ····················</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-16">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="9798996117-16">]</span><span·class="p"·data-group-id="9798996117-13">}</span><span·class="p"·data-group-id="9798996117-12">]</span><span·class="p">,</span><span·class="w">
150 ····</span><span·class="p"·data-group-id="7428972408-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7428972408-18">{</span><span·class="n">SupFlags</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ChildSpecs[·...·truncated·by·diffoscope;·len:·102,·SHA:·342c1f267d607468849a2de1af0bdcf56f8f87ccb54d660ddc61c7cdaeef2641·...·]-17">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">SupFlags</code>·variable·in·the·return·value·from·<code·class="inline">init/1</code>·represents·the150 ····</span><span·class="p"·data-group-id="9798996117-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9798996117-18">{</span><span·class="n">SupFlags</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ChildSpecs[·...·truncated·by·diffoscope;·len:·102,·SHA:·a7df721de494bccb3c22599a6c792eb1531b68ee62650470401008dc577b097f·...·]-17">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">SupFlags</code>·variable·in·the·return·value·from·<code·class="inline">init/1</code>·represents·the
151 <a·href="sup_princ.html#flags">supervisor·flags</a>.</p><p>The·<code·class="inline">ChildSpecs</code>·variable·in·the·return·value·from·<code·class="inline">init/1</code>·is·a·list·of151 <a·href="sup_princ.html#flags">supervisor·flags</a>.</p><p>The·<code·class="inline">ChildSpecs</code>·variable·in·the·return·value·from·<code·class="inline">init/1</code>·is·a·list·of
152 <a·href="sup_princ.html#spec">child·specifications</a>.</p><p><a·href=""·id="flags"></a></p><h2·id="supervisor-flags"·class="section-heading">152 <a·href="sup_princ.html#spec">child·specifications</a>.</p><p><a·href=""·id="flags"></a></p><h2·id="supervisor-flags"·class="section-heading">
153 ··<a·href="#supervisor-flags"·class="hover-link">153 ··<a·href="#supervisor-flags"·class="hover-link">
154 ····<i·class="ri-link-m"·aria-hidden="true"></i>154 ····<i·class="ri-link-m"·aria-hidden="true"></i>
155 ··</a>155 ··</a>
156 ··<span·class="text">Supervisor·Flags</span>156 ··<span·class="text">Supervisor·Flags</span>
157 </h2>157 </h2>
158 <p>This·is·the·type·definition·for·the·supervisor·flags:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sup_flags</span><span·class="p"·data-group-id="1123239805-1">(</span><span·class="p"·data-group-id="1123239805-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1123239805-2">#{</span><span·class="ss">strategy</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">strategy</span><span·class="p"·data-group-id="1123239805-3">(</span><span·class="p"·data-group-id="1123239805-3">)</span><span·class="p">,</span><span·class="w">···········</span><span·class="c1">%·optional</span><span·class="w"> 
159 ················</span><span·class="ss">intensity</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="1123239805-4">(</span><span·class="p"·data-group-id="1123239805-4">)</span><span·class="p">,</span><span·class="w">···</span><span·class="c1">%·optional</span><span·class="w"> 
160 ················</span><span·class="ss">period</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="1123239805-5">(</span><span·class="p"·data-group-id="11232398[·...·truncated·by·diffoscope;·len:·54,·SHA:·dc56e1a0ff0a9d46bedc9812c12aeed9c24bf32853bf2b4de3876f59b3ccbba6·...·]··········</span><span·class="c1">%·optional</span><span·class="w">158 <p>This·is·the·type·definition·for·the·supervisor·flags:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sup_flags</span><span·class="p"·data-group-id="4847348152-1">(</span><span·class="p"·data-group-id="4847348152-1">)</span><span·cla[·...·truncated·by·diffoscope;·len:·404,·SHA:·824935f483767000de23902d0d23c088e16d715b1dc1f4673daa75111c9c94f1·...·]··········</span><span·class="c1">%·optional</span><span·class="w">
 159 ················</span><span·class="ss">intensity</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="4847348152-4">(</span><span·class="p"·data-group-id="4847348152-4">)</span><span·class="p">,</span><span·class="w">···</span><span·class="c1">%·optional</span><span·class="w">
 160 ················</span><span·class="ss">period</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="4847348152-5">(</span><span·class="p"·data-group-id="4847348152-5">)</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·optional</span><span·class="w">
161 ················</span><span·class="ss">auto_shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">auto_shutdown</span><span·class="p"·data-group-id="1123239805-6">(</span><span·class="p"·data-group-id="1123239805-6">)</span><span·class="p"·data-group-id="1123239805-2">}</span><span·class="w">·</span><span·class="c1">%·optional</span><span·class="w">161 ················</span><span·class="ss">auto_shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">auto_shutdown</span><span·class="p"·data-group-id="4847348152-6">(</span><span·class="p"·data-group-id="4847348152-6">)</span><span·class="p"·data-group-id="4847348152-2">}</span><span·class="w">·</span><span·class="c1">%·optional</span><span·class="w">
162 ····</span><span·class="nf">strategy</span><span·class="p"·data-group-id="1123239805-7">(</span><span·class="p"·data-group-id="1123239805-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">one_for_all</span><span·class="w">162 ····</span><span·class="nf">strategy</span><span·class="p"·data-group-id="4847348152-7">(</span><span·class="p"·data-group-id="4847348152-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">one_for_all</span><span·class="w">
163 ···············</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">one_for_one</span><span·class="w">163 ···············</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">one_for_one</span><span·class="w">
164 ···············</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">rest_for_one</span><span·class="w">164 ···············</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">rest_for_one</span><span·class="w">
165 ···············</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">simple_one_for_one</span><span·class="w">165 ···············</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">simple_one_for_one</span><span·class="w">
166 ····</span><span·class="nf">auto_shutdown</span><span·class="p"·data-group-id="1123239805-8">(</span><span·class="p"·data-group-id="1123239805-8">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">never</span><span·class="w">166 ····</span><span·class="nf">auto_shutdown</span><span·class="p"·data-group-id="4847348152-8">(</span><span·class="p"·data-group-id="4847348152-8">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">never</span><span·class="w">
167 ····················</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">any_significant</span><span·class="w">167 ····················</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">any_significant</span><span·class="w">
168 ····················</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">all_significant</span></code></pre><ul><li><code·class="inline">strategy</code>·specifies·the·<a·href="sup_princ.html#strategy">restart·strategy</a>.</li><li><code·class="inline">intensity</code>·and·<code·class="inline">period</code>·specify·the168 ····················</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">all_significant</span></code></pre><ul><li><code·class="inline">strategy</code>·specifies·the·<a·href="sup_princ.html#strategy">restart·strategy</a>.</li><li><code·class="inline">intensity</code>·and·<code·class="inline">period</code>·specify·the
169 <a·href="sup_princ.html#max_intensity">maximum·restart·intensity</a>.</li><li><code·class="inline">auto_shutdown</code>·specifies·whether·and·when·a·supervisor·should169 <a·href="sup_princ.html#max_intensity">maximum·restart·intensity</a>.</li><li><code·class="inline">auto_shutdown</code>·specifies·whether·and·when·a·supervisor·should
170 <a·href="sup_princ.html#automatic-shutdown">automatically·shut·itself·down</a>.</li></ul><p><a·href=""·id="strategy"></a></p><h2·id="restart-strategy"·class="section-heading">170 <a·href="sup_princ.html#automatic-shutdown">automatically·shut·itself·down</a>.</li></ul><p><a·href=""·id="strategy"></a></p><h2·id="restart-strategy"·class="section-heading">
171 ··<a·href="#restart-strategy"·class="hover-link">171 ··<a·href="#restart-strategy"·class="hover-link">
172 ····<i·class="ri-link-m"·aria-hidden="true"></i>172 ····<i·class="ri-link-m"·aria-hidden="true"></i>
173 ··</a>173 ··</a>
Offset 408, 28 lines modifiedOffset 408, 28 lines modified
408 exhaust·the·<a·href="sup_princ.html#max_intensity">Maximum·Restart·Intensity</a>·of·the408 exhaust·the·<a·href="sup_princ.html#max_intensity">Maximum·Restart·Intensity</a>·of·the
409 parent·supervisor.</p></section><p><a·href=""·id="spec"></a></p><h2·id="child-specification"·class="section-heading">409 parent·supervisor.</p></section><p><a·href=""·id="spec"></a></p><h2·id="child-specification"·class="section-heading">
410 ··<a·href="#child-specification"·class="hover-link">410 ··<a·href="#child-specification"·class="hover-link">
411 ····<i·class="ri-link-m"·aria-hidden="true"></i>411 ····<i·class="ri-link-m"·aria-hidden="true"></i>
412 ··</a>412 ··</a>
413 ··<span·class="text">Child·Specification</span>413 ··<span·class="text">Child·Specification</span>
414 </h2>414 </h2>
415 <p>The·type·definition·for·a·child·specification·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">child_spec</span><span·class="p"·data-group-id="1820753680-1">(</span><span·class="p"·data-group-id="1820753680-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1820753680-2">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">child_id</span><span·class="p"·data-group-id="1820753680-3">(</span><span·class="p"·data-group-id="1820753680-3">)</span><span·class="p">,</span><span·class="w">·············</span><span·class="c1">%·mandatory</span><span·class="w"> 
416 ·················</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">mfargs</span><span·class="p"·data-group-id="1820753680-4">(</span><span·class="p"·data-group-id="1820753680-4"[·...·truncated·by·diffoscope;·len:·49,·SHA:·c1348d10958a20c35f38d142a04c14e1c06497b5a79bf818fd20ae814b33f142·...·]············</span><span·class="c1">%·mandatory</span><span·class="w">415 <p>The·type·definition·for·a·child·specification·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">child_spec</span><span·class="p"·data-group-id="2206392623-1">(</span><span·class="p"·data-group-id="2206392623-1">)</span><[·...·truncated·by·diffoscope;·len:·406,·SHA:·662f763a130144f2ae77c781c173695d7b872c3b08a0f849754b862324029dac·...·]············</span><span·class="c1">%·mandatory</span><span·class="w">
 416 ·················</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">mfargs</span><span·class="p"·data-group-id="2206392623-4">(</span><span·class="p"·data-group-id="2206392623-4">)</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·mandatory</span><span·class="w">
417 ·················</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">restart</span><span·class="p"·data-group-id="1820753680-5">(</span><span·class="p"·data-group-id="1820753680-5">)</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·optional</span><span·class="w">417 ·················</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">restart</span><span·class="p"·data-group-id="2206392623-5">(</span><span·class="p"·data-group-id="2206392623-5">)</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·optional</span><span·class="w">
418 ·················</span><span·class="ss">significant</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">significant</span><span·class="p"·data-group-id="1820753680-6">(</span><span·class="p"·data-group-id="1820753680-6">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·optional</span><span·class="w"> 
419 ·················</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="1820753680-7">(</span><span·class="p"·data-group-id="1820753680-7">)</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·optional</span><span·class="w"> 
420 ·················</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">worker</span><span·class="p"·data-group-id="1820753680-8">(</span><span·class="p"·data-group-id="1820753680-8">)</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·19,·SHA:·cdc41c3b86f778a70c395180e042b4243a73269f3386d415d4b2c2ecbdfd1fa7·...·]·</span><span·class="c1">%·optional</span><span·class="w">418 ·················</span><span·class="ss">significant</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">significant</span><span·class="p"·data-group-id="2206392623-6">(</span><span·class="p"·data-group-id="2206392623-6">)</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·19,·SHA:·887e09d9f57385f2929afb80f23f02203796ca6431e1f51107d90a29beb84747·...·]·</span><span·class="c1">%·optional</span><span·class="w">
 419 ·················</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="2206392623-7">(</span><span·class="p"·data-group-id="2206392623-7">)</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·optional</span><span·class="w">
 420 ·················</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">worker</span><span·class="p"·data-group-id="2206392623-8">(</span><span·class="p"·data-group-id="2206392623-8">)</span><span·class="p">,</span><span·class="w">·············</span><span·class="c1">%·optional</span><span·class="w">
421 ·················</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="1820753680-9">(</span><span·class="p"·data-group-id="1820753680-9">)</span><span·class="p"·data-group-id="1820753680-2">}</span><span·class="w">·········</span><span·class="c1">%·optional</span><span·class="w">421 ·················</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="2206392623-9">(</span><span·class="p"·data-group-id="2206392623-9">)</span><span·class="p"·data-group-id="2206392623-2">}</span><span·class="w">·········</span><span·class="c1">%·optional</span><span·class="w">
422 ····</span><span·class="nf">child_id</span><span·class="p"·data-group-id="1820753680-10">(</span><span·class="p"·data-group-id="1820753680-10">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="1820753680-11">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·f8daca53c3614c2e5a201551900bce5dfd3137285ddcc3f3f457322e85d6dc2a·...·]-11">)</span><span·class="w">422 ····</span><span·class="nf">child_id</span><span·class="p"·data-group-id="2206392623-10">(</span><span·class="p"·data-group-id="2206392623-10">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="2206392623-11">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·bfe2fa9c6a637947502b146b3aef2830f0cb651e002d6ceb8ec6eae2561ec66f·...·]-11">)</span><span·class="w">
423 ····</span><span·class="nf">mfargs</span><span·class="p"·data-group-id="1820753680-12">(</span><span·class="p"·data-group-id="1820753680-12">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1820753680-13">{</span><span·class="n">M</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·962,·SHA:·55c20fec86dbe04e7de6358b199e771f6c200bfbb83463c41994d9e77b50c039·...·]-13">}</span><span·class="w">423 ····</span><span·class="nf">mfargs</span><span·class="p"·data-group-id="2206392623-12">(</span><span·class="p"·data-group-id="2206392623-12">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2206392623-13">{</span><span·class="n">M</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·962,·SHA:·5b79ffce1701696733bb725108351fc2de1aaebbbad4f6dfa37bea73a58b61aa·...·]-13">}</span><span·class="w">
424 ····</span><span·class="nf">modules</span><span·class="p"·data-group-id="1820753680-18">(</span><span·class="p"·data-group-id="1820753680-18">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1820753680-19">[</span><span·class="nf">module</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·126,·SHA:·1b86e8986423f3efae6a86d03d96b9424cf6e142c8e30cbab1916a8c94595b8f·...·]-19">]</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">dynamic</span><span·class="w">424 ····</span><span·class="nf">modules</span><span·class="p"·data-group-id="2206392623-18">(</span><span·class="p"·data-group-id="2206392623-18">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2206392623-19">[</span><span·class="nf">module</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·126,·SHA:·69e82ffa76cfb412fbe156877441ecc36931be1b1dbd7595c9e63db75f908218·...·]-19">]</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">dynamic</span><span·class="w">
425 ····</span><span·class="nf">restart</span><span·class="p"·data-group-id="1820753680-21">(</span><span·class="p"·data-group-id="1820753680-21">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">permanent</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">transient</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">temporary</span><span·class="w">425 ····</span><span·class="nf">restart</span><span·class="p"·data-group-id="2206392623-21">(</span><span·class="p"·data-group-id="2206392623-21">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">permanent</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">transient</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">temporary</span><span·class="w">
426 ····</span><span·class="nf">significant</span><span·class="p"·data-group-id="1820753680-22">(</span><span·class="p"·data-group-id="1820753680-22">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="1820753680-23">(</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·75efec23691c6d1f4f565e283edcb67c6ca8177bad485ede63457bb09431870f·...·]-23">)</span><span·class="w">426 ····</span><span·class="nf">significant</span><span·class="p"·data-group-id="2206392623-22">(</span><span·class="p"·data-group-id="2206392623-22">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="2206392623-23">(</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·58fcd68e9581682df7940557e56064daae5dabc9497fd013c6019a1554b746b0·...·]-23">)</span><span·class="w">
427 ····</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="1820753680-24">(</span><span·class="p"·data-group-id="1820753680-24">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·126,·SHA:·6b87f6a9950cfcbf24befa61b7d98b250a79f172ac45865fa4050f38c5888850·...·]-25">)</span><span·class="w">427 ····</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="2206392623-24">(</span><span·class="p"·data-group-id="2206392623-24">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·126,·SHA:·167abf4920e62f0720011b9d9b1208eaadffa31de5c69f8d265508ebdf503e55·...·]-25">)</span><span·class="w">
428 ····</span><span·class="nf">worker</span><span·class="p"·data-group-id="1820753680-26">(</span><span·class="p"·data-group-id="1820753680-26">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">worker</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">supervisor</span></code></pre><ul><li><p><code·class="inline">id</code>·is·used·to·identify·the·child·specification·internally·by·the·supervisor.</p><p>The·<code·class="inline">id</code>·key·is·mandatory.</p><p>Note·that·this·identifier·occasionally·has·been·called·&quot;name&quot;.·As·far·as428 ····</span><span·class="nf">worker</span><span·class="p"·data-group-id="2206392623-26">(</span><span·class="p"·data-group-id="2206392623-26">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">worker</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">supervisor</span></code></pre><ul><li><p><code·class="inline">id</code>·is·used·to·identify·the·child·specification·internally·by·the·supervisor.</p><p>The·<code·class="inline">id</code>·key·is·mandatory.</p><p>Note·that·this·identifier·occasionally·has·been·called·&quot;name&quot;.·As·far·as
429 possible,·the·terms·&quot;identifier&quot;·or·&quot;id&quot;·are·now·used·but·in·order·to·keep429 possible,·the·terms·&quot;identifier&quot;·or·&quot;id&quot;·are·now·used·but·in·order·to·keep
430 backwards·compatibility,·some·occurrences·of·&quot;name&quot;·can·still·be·found,·for430 backwards·compatibility,·some·occurrences·of·&quot;name&quot;·can·still·be·found,·for
431 example·in·error·messages.</p></li><li><p><code·class="inline">start</code>·defines·the·function·call·used·to·start·the·child·process.·It·is·a431 example·in·error·messages.</p></li><li><p><code·class="inline">start</code>·defines·the·function·call·used·to·start·the·child·process.·It·is·a
432 module-function-arguments·tuple·used·as·<a·href="../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,·F,·A)</code></a>.</p><p>It·is·to·be·(or·result·in)·a·call·to·any·of·the·following:</p><ul><li><a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/3"><code·class="inline">supervisor:start_link/2,3</code></a></li><li><a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/3,4</code></a></li><li><a·href="../../lib/stdlib-6.2.2/doc/html/gen_statem.html#start_link/4"><code·class="inline">gen_statem:start_link/3,4</code></a></li><li><a·href="../../lib/stdlib-6.2.2/doc/html/gen_event.html#start_link/2"><code·class="inline">gen_event:start_link/0,1,2</code></a></li><li>A·function·compliant·with·these·functions.·For·details,·see432 module-function-arguments·tuple·used·as·<a·href="../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,·F,·A)</code></a>.</p><p>It·is·to·be·(or·result·in)·a·call·to·any·of·the·following:</p><ul><li><a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/3"><code·class="inline">supervisor:start_link/2,3</code></a></li><li><a·href="../../lib/stdlib-6.2.2/doc/html/gen_server.html#start_link/4"><code·class="inline">gen_server:start_link/3,4</code></a></li><li><a·href="../../lib/stdlib-6.2.2/doc/html/gen_statem.html#start_link/4"><code·class="inline">gen_statem:start_link/3,4</code></a></li><li><a·href="../../lib/stdlib-6.2.2/doc/html/gen_event.html#start_link/2"><code·class="inline">gen_event:start_link/0,1,2</code></a></li><li>A·function·compliant·with·these·functions.·For·details,·see
433 <a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html"><code·class="inline">supervisor</code></a>.</li></ul><p>The·<code·class="inline">start</code>·key·is·mandatory.</p></li><li><p><a·href=""·id="restart"></a>·<code·class="inline">restart</code>·defines·when·a·terminated·child·process·is·to·be433 <a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html"><code·class="inline">supervisor</code></a>.</li></ul><p>The·<code·class="inline">start</code>·key·is·mandatory.</p></li><li><p><a·href=""·id="restart"></a>·<code·class="inline">restart</code>·defines·when·a·terminated·child·process·is·to·be
434 restarted.</p><ul><li>A·<code·class="inline">permanent</code>·child·process·is·always·restarted.</li><li>A·<code·class="inline">temporary</code>·child·process·is·never·restarted·(not·even·when·the·supervisor434 restarted.</p><ul><li>A·<code·class="inline">permanent</code>·child·process·is·always·restarted.</li><li>A·<code·class="inline">temporary</code>·child·process·is·never·restarted·(not·even·when·the·supervisor
435 restart·strategy·is·<code·class="inline">rest_for_one</code>·or·<code·class="inline">one_for_all</code>·and·a·sibling·death435 restart·strategy·is·<code·class="inline">rest_for_one</code>·or·<code·class="inline">one_for_all</code>·and·a·sibling·death
Offset 457, 53 lines modifiedOffset 457, 53 lines modified
457 <code·class="inline">supervisor</code>,·the·default·value·<code·class="inline">infinity</code>·will·be·used.</p></li><li><p><code·class="inline">type</code>·specifies·whether·the·child·process·is·a·supervisor·or·a·worker.</p><p>The·<code·class="inline">type</code>·key·is·optional.·If·it·is·not·given,·the·default·value·<code·class="inline">worker</code>457 <code·class="inline">supervisor</code>,·the·default·value·<code·class="inline">infinity</code>·will·be·used.</p></li><li><p><code·class="inline">type</code>·specifies·whether·the·child·process·is·a·supervisor·or·a·worker.</p><p>The·<code·class="inline">type</code>·key·is·optional.·If·it·is·not·given,·the·default·value·<code·class="inline">worker</code>
458 will·be·used.</p></li><li><p><code·class="inline">modules</code>·has·to·be·a·list·consisting·of·a·single·element.·The·value458 will·be·used.</p></li><li><p><code·class="inline">modules</code>·has·to·be·a·list·consisting·of·a·single·element.·The·value
459 of·that·element·depends·on·the·behaviour·of·the·process:</p><ul><li>If·the·child·process·is·a·<code·class="inline">gen_event</code>,·the·element·has·to·be·the·atom459 of·that·element·depends·on·the·behaviour·of·the·process:</p><ul><li>If·the·child·process·is·a·<code·class="inline">gen_event</code>,·the·element·has·to·be·the·atom
460 <code·class="inline">dynamic</code>.</li><li>Otherwise,·the·element·should·be·<code·class="inline">Module</code>,·where·<code·class="inline">Module</code>·is·the460 <code·class="inline">dynamic</code>.</li><li>Otherwise,·the·element·should·be·<code·class="inline">Module</code>,·where·<code·class="inline">Module</code>·is·the
461 name·of·the·callback·module.</li></ul><p>This·information·is·used·by·the·release·handler·during·upgrades·and461 name·of·the·callback·module.</li></ul><p>This·information·is·used·by·the·release·handler·during·upgrades·and
462 downgrades;·see·<a·href="release_handling.html">Release·Handling</a>.</p><p>The·<code·class="inline">modules</code>·key·is·optional.·If·it·is·not·given,·it·defaults·to·<code·class="inline">[M]</code>,·where462 downgrades;·see·<a·href="release_handling.html">Release·Handling</a>.</p><p>The·<code·class="inline">modules</code>·key·is·optional.·If·it·is·not·given,·it·defaults·to·<code·class="inline">[M]</code>,·where
463 <code·class="inline">M</code>·comes·from·the·child's·start·<code·class="inline">{M,F,A}</code>.</p></li></ul><p><em>Example:</em>·The·child·specification·to·start·the·server·<code·class="inline">ch3</code>·in·the·previous463 <code·class="inline">M</code>·comes·from·the·child's·start·<code·class="inline">{M,F,A}</code>.</p></li></ul><p><em>Example:</em>·The·child·specification·to·start·the·server·<code·class="inline">ch3</code>·in·the·previous
464 example·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0117804277-1">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">464 example·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1656059868-1">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">
465 ··</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0117804277-2">{</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0117804277-3">[</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·e38e0b74c71a1e8a39164cd515f52bcb94722cbf2e138710be0d56f3f63f12ad·...·]-2">}</span><span·class="p">,</span><span·class="w">465 ··</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1656059868-2">{</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1656059868-3">[</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·5590a792fc5f3c8daaf6b9512cbb2fb33cddb41587facc264f0ca841ff49dc37·...·]-2">}</span><span·class="p">,</span><span·class="w">
466 ··</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">permanent</span><span·class="p">,</span><span·class="w">466 ··</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">permanent</span><span·class="p">,</span><span·class="w">
467 ··</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="p">,</span><span·class="w">467 ··</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">brutal_kill</span><span·class="p">,</span><span·class="w">
468 ··</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">worker</span><span·class="p">,</span><span·class="w">468 ··</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">worker</span><span·class="p">,</span><span·class="w">
469 ··</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0117804277-4">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="0117804277-4">]</span><span·class="p"·data-group-id="0117804277-1">}</span></code></pre><p>or·simplified,·relying·on·the·default·values:</p><pre><code·class="text">#{id·=&gt;·ch3,469 ··</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1656059868-4">[</span><span·class="ss">ch3</span><span·class="p"·data-group-id="1656059868-4">]</span><span·class="p"·data-group-id="1656059868-1">}</span></code></pre><p>or·simplified,·relying·on·the·default·values:</p><pre><code·class="text">#{id·=&gt;·ch3,
470 ··start·=&gt;·{ch3,·start_link,·[]},470 ··start·=&gt;·{ch3,·start_link,·[]},
471 ··shutdown·=&gt;·brutal_kill}</code></pre><p>Example:·A·child·specification·to·start·the·event·manager·from·the·chapter·about471 ··shutdown·=&gt;·brutal_kill}</code></pre><p>Example:·A·child·specification·to·start·the·event·manager·from·the·chapter·about
472 <a·href="events.html#mgr">gen_event</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5184843311-1">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">error_man</span><span·class="p">,</span><span·class="w">472 <a·href="events.html#mgr">gen_event</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5640732254-1">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">error_man</span><span·class="p">,</span><span·class="w">
473 ··</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5184843311-2">{</span><span·class="ss">gen_event</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5184843311-3">[</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·291,·SHA:·cadda724634d4ca03bd3f2b6d38c6faa46a4465ace629a9dc828b5fe0e7ff317·...·]-2">}</span><span·class="p">,</span><span·class="w">473 ··</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5640732254-2">{</span><span·class="ss">gen_event</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5640732254-3">[</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·291,·SHA:·6da3fa80c2a7d06322b1dc262f76578d8987e7c6bcefbb6e217e3b99e699e91a·...·]-2">}</span><span·class="p">,</span><span·class="w">
474 ··</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">dynamic</span><span·class="p"·data-group-id="5184843311-1">}</span></code></pre><p>Both·server·and·event·manager·are·registered·processes·which·can·be·expected·to474 ··</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">dynamic</span><span·class="p"·data-group-id="5640732254-1">}</span></code></pre><p>Both·server·and·event·manager·are·registered·processes·which·can·be·expected·to
475 be·always·accessible.·Thus·they·are·specified·to·be·<code·class="inline">permanent</code>.</p><p><code·class="inline">ch3</code>·does·not·need·to·do·any·cleaning·up·before·termination.·Thus,·no·shutdown475 be·always·accessible.·Thus·they·are·specified·to·be·<code·class="inline">permanent</code>.</p><p><code·class="inline">ch3</code>·does·not·need·to·do·any·cleaning·up·before·termination.·Thus,·no·shutdown
476 time·is·needed,·but·<code·class="inline">brutal_kill</code>·is·sufficient.·<code·class="inline">error_man</code>·can·need·some·time476 time·is·needed,·but·<code·class="inline">brutal_kill</code>·is·sufficient.·<code·class="inline">error_man</code>·can·need·some·time
477 for·the·event·handlers·to·clean·up,·thus·the·shutdown·time·is·set·to·5000·ms477 for·the·event·handlers·to·clean·up,·thus·the·shutdown·time·is·set·to·5000·ms
478 (which·is·the·default·value).</p><p>Example:·A·child·specification·to·start·another·supervisor:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9969859374-1">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">sup</span><span·class="p">,</span><span·class="w">478 (which·is·the·default·value).</p><p>Example:·A·child·specification·to·start·another·supervisor:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3476866432-1">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">sup</span><span·class="p">,</span><span·class="w">
479 ··</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9969859374-2">{</span><span·class="ss">sup</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9969859374-3">[</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·23fb3ba2bd5b1b75e4560c6497da4f283673a4b88260be6aa8beb141e95ecd1c·...·]-2">}</span><span·class="p">,</span><span·class="w">479 ··</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3476866432-2">{</span><span·class="ss">sup</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_link</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3476866432-3">[</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·189c89887d428acad517c1f70511e26f9bfc988718b93c87eb47b6061cbde703·...·]-2">}</span><span·class="p">,</span><span·class="w">
480 ··</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">transient</span><span·class="p">,</span><span·class="w">480 ··</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">transient</span><span·class="p">,</span><span·class="w">
481 ··</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="9969859374-1">}</span><span·class="w">·</span><span·class="c1">%·will·cause·default·shutdown=&gt;infinity</span></code></pre><p><a·href=""·id="super_tree"></a></p><h2·id="starting-a-supervisor"·class="section-heading">481 ··</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">supervisor</span><span·class="p"·data-group-id="3476866432-1">}</span><span·class="w">·</span><span·class="c1">%·will·cause·default·shutdown=&gt;infinity</span></code></pre><p><a·href=""·id="super_tree"></a></p><h2·id="starting-a-supervisor"·class="section-heading">
482 ··<a·href="#starting-a-supervisor"·class="hover-link">482 ··<a·href="#starting-a-supervisor"·class="hover-link">
483 ····<i·class="ri-link-m"·aria-hidden="true"></i>483 ····<i·class="ri-link-m"·aria-hidden="true"></i>
484 ··</a>484 ··</a>
485 ··<span·class="text">Starting·a·Supervisor</span>485 ··<span·class="text">Starting·a·Supervisor</span>
486 </h2>486 </h2>
487 <p>In·the·previous·example,·the·supervisor·is·started·by·calling487 <p>In·the·previous·example,·the·supervisor·is·started·by·calling
488 <code·class="inline">ch_sup:start_link()</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start_link</span><span·class="p"·data-group-id="1389567200-1">(</span><span·class="p"·data-group-id="1389567200-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">488 <code·class="inline">ch_sup:start_link()</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start_link</span><span·class="p"·data-group-id="8017131001-1">(</span><span·class="p"·data-group-id="8017131001-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
489 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="1389567200-2">(</span><span·class="ss">ch_sup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1389567200-3">[</span><span·class="p"·data-group-id="1389567200-3">]</span><span·class="p"·data-group-id="1389567200-2">)</span><span·class="p">.</span></code></pre><p><code·class="inline">ch_sup:start_link</code>·calls·function·<a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/2"><code·class="inline">supervisor:start_link/2</code></a>,·which·spawns·and489 ····</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="8017131001-2">(</span><span·class="ss">ch_sup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8017131001-3">[</span><span·class="p"·data-group-id="8017131001-3">]</span><span·class="p"·data-group-id="8017131001-2">)</span><span·class="p">.</span></code></pre><p><code·class="inline">ch_sup:start_link</code>·calls·function·<a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/2"><code·class="inline">supervisor:start_link/2</code></a>,·which·spawns·and
490 links·to·a·new·process,·a·supervisor.</p><ul><li>The·first·argument,·<code·class="inline">ch_sup</code>,·is·the·name·of·the·callback·module,·that·is,·the490 links·to·a·new·process,·a·supervisor.</p><ul><li>The·first·argument,·<code·class="inline">ch_sup</code>,·is·the·name·of·the·callback·module,·that·is,·the
491 module·where·the·<code·class="inline">init</code>·callback·function·is·located.</li><li>The·second·argument,·<code·class="inline">[]</code>,·is·a·term·that·is·passed·as·is·to·the·callback491 module·where·the·<code·class="inline">init</code>·callback·function·is·located.</li><li>The·second·argument,·<code·class="inline">[]</code>,·is·a·term·that·is·passed·as·is·to·the·callback
492 function·<code·class="inline">init</code>.·Here,·<code·class="inline">init</code>·does·not·need·any·data·and·ignores·the·argument.</li></ul><p>In·this·case,·the·supervisor·is·not·registered.·Instead·its·pid·must·be·used.·A492 function·<code·class="inline">init</code>.·Here,·<code·class="inline">init</code>·does·not·need·any·data·and·ignores·the·argument.</li></ul><p>In·this·case,·the·supervisor·is·not·registered.·Instead·its·pid·must·be·used.·A
493 name·can·be·specified·by·calling493 name·can·be·specified·by·calling
494 <a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/3"><code·class="inline">supervisor:start_link({local,·Name},·Module,·Args)</code></a>494 <a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/3"><code·class="inline">supervisor:start_link({local,·Name},·Module,·Args)</code></a>
495 or495 or
496 <a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/3"><code·class="inline">supervisor:start_link({global,·Name},·Module,·Args)</code></a>.</p><p>The·new·supervisor·process·calls·the·callback·function·<code·class="inline">ch_sup:init([])</code>.·<code·class="inline">init</code>496 <a·href="../../lib/stdlib-6.2.2/doc/html/supervisor.html#start_link/3"><code·class="inline">supervisor:start_link({global,·Name},·Module,·Args)</code></a>.</p><p>The·new·supervisor·process·calls·the·callback·function·<code·class="inline">ch_sup:init([])</code>.·<code·class="inline">init</code>
497 has·to·return·<code·class="inline">{ok,·{SupFlags,·ChildSpecs}}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="0305874957-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="0305874957-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">497 has·to·return·<code·class="inline">{ok,·{SupFlags,·ChildSpecs}}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init</span><span·class="p"·data-group-id="8815667364-1">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="8815667364-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
498 ····</span><span·class="n">SupFlags</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0305874957-2">#{</span><span·class="p"·data-group-id="0305874957-2">}</span><span·class="p">,</span><span·class="w">498 ····</span><span·class="n">SupFlags</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8815667364-2">#{</span><span·class="p"·data-group-id="8815667364-2">}</span><span·class="p">,</span><span·class="w">
499 ····</span><span·class="n">ChildSpecs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0305874957-3">[</span><span·class="p"·data-group-id="0305874957-4">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">499 ····</span><span·class="n">ChildSpecs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8815667364-3">[</span><span·class="p"·data-group-id="8815667364-4">#{</span><span·class="ss">id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">ch3</span><span·class="p">,</span><span·class="w">
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216 ······<p·class="built-using">216 ······<p·class="built-using">
217 ········Built·using217 ········Built·using
218 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the218 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
219 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>219 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
220 ······</p>220 ······</p>
221 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>221 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
222 ····</footer>222 ····</footer>
223 ··</div>223 ··</div>
224 </main>224 </main>
225 </div>225 </div>
226 <script>226 <script>
227 ··function·mermaidLoaded()·{227 ··function·mermaidLoaded()·{
228 ····mermaid.initialize({228 ····mermaid.initialize({
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269 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>269 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
270 ······</p>270 ······</p>
271 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>271 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
272 ····</footer>272 ····</footer>
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274 </main>274 </main>
275 </div>275 </div>
276 <script>276 <script>
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278 ····mermaid.initialize({278 ····mermaid.initialize({
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146 ····<i·class="ri-link-m"·aria-hidden="true"></i>146 ····<i·class="ri-link-m"·aria-hidden="true"></i>
147 ··</a>147 ··</a>
148 ··<span·class="text">Deleting·an·Element</span>148 ··<span·class="text">Deleting·an·Element</span>
149 </h3>149 </h3>
150 <p>The·<code·class="inline">delete</code>·operation·is·considered·successful·if·the·element·was·not·present150 <p>The·<code·class="inline">delete</code>·operation·is·considered·successful·if·the·element·was·not·present
151 in·the·table.·Hence·all·attempts·to·check·that·the·element·is·present·in·the151 in·the·table.·Hence·all·attempts·to·check·that·the·element·is·present·in·the
152 Ets/Mnesia·table·before·deletion·are·unnecessary.·Here·follows·an·example·for152 Ets/Mnesia·table·before·deletion·are·unnecessary.·Here·follows·an·example·for
153 Ets·tables:</p><p><strong>DO</strong></p><pre><code·class="text">ets:delete(Tab,·Key),</code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="3645195689-1">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="3645195689-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">153 Ets·tables:</p><p><strong>DO</strong></p><pre><code·class="text">ets:delete(Tab,·Key),</code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="9263357084-1">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="9263357084-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
154 ····</span><span·class="p"·data-group-id="3645195689-2">[</span><span·class="p"·data-group-id="3645195689-2">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">154 ····</span><span·class="p"·data-group-id="9263357084-2">[</span><span·class="p"·data-group-id="9263357084-2">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
155 ········</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">155 ········</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
156 ····</span><span·class="p"·data-group-id="3645195689-3">[</span><span·class="p">_</span><span·class="p">|</span><span·class="p">_</span><span·class="p"·data-group-id="3645195689-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 ····</span><span·class="p"·data-group-id="9263357084-3">[</span><span·class="p">_</span><span·class="p">|</span><span·class="p">_</span><span·class="p"·data-group-id="9263357084-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ········</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="3645195689-4">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="3645195689-4">)</span><span·class="w">157 ········</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="9263357084-4">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="9263357084-4">)</span><span·class="w">
158 </span><span·class="k">end</span><span·class="p">,</span></code></pre><h3·id="fetching-data"·class="section-heading">158 </span><span·class="k">end</span><span·class="p">,</span></code></pre><h3·id="fetching-data"·class="section-heading">
159 ··<a·href="#fetching-data"·class="hover-link">159 ··<a·href="#fetching-data"·class="hover-link">
160 ····<i·class="ri-link-m"·aria-hidden="true"></i>160 ····<i·class="ri-link-m"·aria-hidden="true"></i>
161 ··</a>161 ··</a>
162 ··<span·class="text">Fetching·Data</span>162 ··<span·class="text">Fetching·Data</span>
163 </h3>163 </h3>
164 <p>Do·not·fetch·data·that·you·already·have.</p><p>Consider·that·you·have·a·module·that·handles·the·abstract·data·type·<code·class="inline">Person</code>.164 <p>Do·not·fetch·data·that·you·already·have.</p><p>Consider·that·you·have·a·module·that·handles·the·abstract·data·type·<code·class="inline">Person</code>.
165 You·export·the·interface·function·<code·class="inline">print_person/1</code>,·which·uses·the·internal165 You·export·the·interface·function·<code·class="inline">print_person/1</code>,·which·uses·the·internal
166 functions·<code·class="inline">print_name/1</code>,·<code·class="inline">print_age/1</code>,·and·<code·class="inline">print_occupation/1</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·the·function·<code·class="inline">print_name/1</code>,·and·so·on,·had·been·interface·functions,·the166 functions·<code·class="inline">print_name/1</code>,·<code·class="inline">print_age/1</code>,·and·<code·class="inline">print_occupation/1</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·the·function·<code·class="inline">print_name/1</code>,·and·so·on,·had·been·interface·functions,·the
167 situation·would·have·been·different,·as·you·do·not·want·the·user·of·the167 situation·would·have·been·different,·as·you·do·not·want·the·user·of·the
168 interface·to·know·about·the·internal·data·representation.</p></section><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%·Interface·function</span><span·class="w">168 interface·to·know·about·the·internal·data·representation.</p></section><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%·Interface·function</span><span·class="w">
169 </span><span·class="nf">print_person</span><span·class="p"·data-group-id="2855937063-1">(</span><span·class="n">PersonId</span><span·class="p"·data-group-id="2855937063-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 </span><span·class="nf">print_person</span><span·class="p"·data-group-id="9200850047-1">(</span><span·class="n">PersonId</span><span·class="p"·data-group-id="9200850047-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 ····</span><span·class="c1">%%·Look·up·the·person·in·the·named·table·person,</span><span·class="w">170 ····</span><span·class="c1">%%·Look·up·the·person·in·the·named·table·person,</span><span·class="w">
171 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="2855937063-2">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PersonId</span><span·class="p"·data-group-id="2855937063-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">171 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="9200850047-2">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PersonId</span><span·class="p"·data-group-id="9200850047-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
172 ········</span><span·class="p"·data-group-id="2855937063-3">[</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 ········</span><span·class="p"·data-group-id="9200850047-3">[</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ············</span><span·class="nf">print_name</span><span·class="p"·data-group-id="2855937063-4">(</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-4">)</span><span·class="p">,</span><span·class="w">173 ············</span><span·class="nf">print_name</span><span·class="p"·data-group-id="9200850047-4">(</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-4">)</span><span·class="p">,</span><span·class="w">
174 ············</span><span·class="nf">print_age</span><span·class="p"·data-group-id="2855937063-5">(</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-5">)</span><span·class="p">,</span><span·class="w">174 ············</span><span·class="nf">print_age</span><span·class="p"·data-group-id="9200850047-5">(</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-5">)</span><span·class="p">,</span><span·class="w">
175 ············</span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="2855937063-6">(</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-6">)</span><span·class="p">;</span><span·class="w">175 ············</span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="9200850047-6">(</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-6">)</span><span·class="p">;</span><span·class="w">
176 ········</span><span·class="p"·data-group-id="2855937063-7">[</span><span·class="p"·data-group-id="2855937063-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 ········</span><span·class="p"·data-group-id="9200850047-7">[</span><span·class="p"·data-group-id="9200850047-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2855937063-8">(</span><span·class="s">&quot;No·person·with·ID·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2855937063-9">[</span><sp[·...·truncated·by·diffoscope;·len:·122,·SHA:·b6cd9b43632219d6126ad32b500e7be6b21a76d5b43e6d505e3d995cbfeb6e8c·...·]-8">)</span><span·class="w">177 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9200850047-8">(</span><span·class="s">&quot;No·person·with·ID·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9200850047-9">[</span><sp[·...·truncated·by·diffoscope;·len:·122,·SHA:·7d792f0a6acc7f8d1eda7c786037fbdbcbeb2d28b36280f85a49bf28a8f5fe5d·...·]-8">)</span><span·class="w">
178 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">178 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
179 </span><span·class="c1">%%%·Internal·functions</span><span·class="w">179 </span><span·class="c1">%%%·Internal·functions</span><span·class="w">
180 </span><span·class="nf">print_name</span><span·class="p"·data-group-id="2855937063-10">(</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 </span><span·class="nf">print_name</span><span·class="p"·data-group-id="9200850047-10">(</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2855937063-11">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2855937063-12">[</span><span·class[·...·truncated·by·diffoscope;·len:·219,·SHA:·1035c6fc75939f1ba0612d9119ab2b30602e51b5475588d00a243331d29ace75·...·]-11">)</span><span·class="p">.</span><span·class="w">181 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9200850047-11">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9200850047-12">[</span><span·class[·...·truncated·by·diffoscope;·len:·219,·SHA:·4960c18b32198f8c4e20192c932275e2f6ffc0fd5caf82a0a4390982281cd74d·...·]-11">)</span><span·class="p">.</span><span·class="w">
  
182 </span><span·class="nf">print_age</span><span·class="p"·data-group-id="2855937063-13">(</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 </span><span·class="nf">print_age</span><span·class="p"·data-group-id="9200850047-13">(</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2855937063-14">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2855937063-15">[</span><span·class[·...·truncated·by·diffoscope;·len:·218,·SHA:·c1706df54461c9c90c0b47c6570d6a7c016f57bcd492e90acdf73ca26e31d794·...·]-14">)</span><span·class="p">.</span><span·class="w">183 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9200850047-14">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9200850047-15">[</span><span·class[·...·truncated·by·diffoscope;·len:·218,·SHA:·b0e64eb2377b534886e0b7d20c1028206e1587cd126531dfd944a07d6da5123f·...·]-14">)</span><span·class="p">.</span><span·class="w">
  
184 </span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="2855937063-16">(</span><span·class="n">Person</span><span·class="p"·data-group-id="2855937063-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 </span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="9200850047-16">(</span><span·class="n">Person</span><span·class="p"·data-group-id="9200850047-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2855937063-17">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2855937063-18">[</span><span·class[·...·truncated·by·diffoscope;·len:·225,·SHA:·45e0a4da0fc55ce07ffc8446754d196a9a94f7a11ecd8735245b1cd59c919ed6·...·]-17">)</span><span·class="p">.</span></code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%·Interface·function</span><span·class="w">185 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9200850047-17">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9200850047-18">[</span><span·class[·...·truncated·by·diffoscope;·len:·225,·SHA:·fc7663c77c8a5d00c2bb4c021eec48c8f01240796523cf0c103ac1fbc37b819b·...·]-17">)</span><span·class="p">.</span></code></pre><p><strong>DO·NOT</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%·Interface·function</span><span·class="w">
186 </span><span·class="nf">print_person</span><span·class="p"·data-group-id="1951305787-1">(</span><span·class="n">PersonId</span><span·class="p"·data-group-id="1951305787-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">186 </span><span·class="nf">print_person</span><span·class="p"·data-group-id="0951214264-1">(</span><span·class="n">PersonId</span><span·class="p"·data-group-id="0951214264-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
187 ····</span><span·class="c1">%%·Look·up·the·person·in·the·named·table·person,</span><span·class="w">187 ····</span><span·class="c1">%%·Look·up·the·person·in·the·named·table·person,</span><span·class="w">
188 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="1951305787-2">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PersonId</span><span·class="p"·data-group-id="1951305787-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">188 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="0951214264-2">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PersonId</span><span·class="p"·data-group-id="0951214264-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
189 ········</span><span·class="p"·data-group-id="1951305787-3">[</span><span·class="n">Person</span><span·class="p"·data-group-id="1951305787-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">189 ········</span><span·class="p"·data-group-id="0951214264-3">[</span><span·class="n">Person</span><span·class="p"·data-group-id="0951214264-3">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
190 ············</span><span·class="nf">print_name</span><span·class="p"·data-group-id="1951305787-4">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="1951305787-4">)</span><span·class="p">,</span><span·class="w">190 ············</span><span·class="nf">print_name</span><span·class="p"·data-group-id="0951214264-4">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="0951214264-4">)</span><span·class="p">,</span><span·class="w">
191 ············</span><span·class="nf">print_age</span><span·class="p"·data-group-id="1951305787-5">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="1951305787-5">)</span><span·class="p">,</span><span·class="w">191 ············</span><span·class="nf">print_age</span><span·class="p"·data-group-id="0951214264-5">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="0951214264-5">)</span><span·class="p">,</span><span·class="w">
192 ············</span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="1951305787-6">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="1951305787-6">)</span><span·class="p">;</span><span·class="w">192 ············</span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="0951214264-6">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="0951214264-6">)</span><span·class="p">;</span><span·class="w">
193 ········</span><span·class="p"·data-group-id="1951305787-7">[</span><span·class="p"·data-group-id="1951305787-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 ········</span><span·class="p"·data-group-id="0951214264-7">[</span><span·class="p"·data-group-id="0951214264-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1951305787-8">(</span><span·class="s">&quot;No·person·with·ID·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1951305787-9">[</span><sp[·...·truncated·by·diffoscope;·len:·122,·SHA:·76ab91c841e93d89a422ae6722893789d6e10e6ab9e3f97a4f540af0724c8619·...·]-8">)</span><span·class="w">194 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0951214264-8">(</span><span·class="s">&quot;No·person·with·ID·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0951214264-9">[</span><sp[·...·truncated·by·diffoscope;·len:·122,·SHA:·cd0e5396083dd8fdd9ec6aaf18f202e6b9cba70e1c17d63416b56bd2478d574e·...·]-8">)</span><span·class="w">
195 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">195 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
196 </span><span·class="c1">%%%·Internal·functions</span><span·class="w">196 </span><span·class="c1">%%%·Internal·functions</span><span·class="w">
197 </span><span·class="nf">print_name</span><span·class="p"·data-group-id="1951305787-10">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="1951305787-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">197 </span><span·class="nf">print_name</span><span·class="p"·data-group-id="0951214264-10">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="0951214264-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
198 ····</span><span·class="p"·data-group-id="1951305787-11">[</span><span·class="n">Person</span><span·class="p"·data-group-id="1951305787-11">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</sp[·...·truncated·by·diffoscope;·len:·207,·SHA:·946ba3eb3dc0aa919a5c9f3f554402640c905b0bcc58a3d802b40fdecd8c8c7d·...·]-12">)</span><span·class="p">,</span><span·class="w">198 ····</span><span·class="p"·data-group-id="0951214264-11">[</span><span·class="n">Person</span><span·class="p"·data-group-id="0951214264-11">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</sp[·...·truncated·by·diffoscope;·len:·207,·SHA:·1b26d6adea783c1db1d7d4c855214f76801d657b19ac1866a39947516348fc36·...·]-12">)</span><span·class="p">,</span><span·class="w">
199 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1951305787-13">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1951305787-14">[</span><span·class[·...·truncated·by·diffoscope;·len:·219,·SHA:·417300414d0a843bfc02c21d0717169bb99a956357c03c92ecf6da3e7b151080·...·]-13">)</span><span·class="p">.</span><span·class="w">199 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0951214264-13">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0951214264-14">[</span><span·class[·...·truncated·by·diffoscope;·len:·219,·SHA:·257100ae8decf92b082a78fe616fcd195efc29228f76e6cfa59ff1b84c02e8a6·...·]-13">)</span><span·class="p">.</span><span·class="w">
  
200 </span><span·class="nf">print_age</span><span·class="p"·data-group-id="1951305787-15">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="1951305787-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">200 </span><span·class="nf">print_age</span><span·class="p"·data-group-id="0951214264-15">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="0951214264-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
201 ····</span><span·class="p"·data-group-id="1951305787-16">[</span><span·class="n">Person</span><span·class="p"·data-group-id="1951305787-16">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</sp[·...·truncated·by·diffoscope;·len:·207,·SHA:·690f6505ed9a0c45c190c0c865f9f0df45ebd0521ab083c3f8b7126174f6b321·...·]-17">)</span><span·class="p">,</span><span·class="w">201 ····</span><span·class="p"·data-group-id="0951214264-16">[</span><span·class="n">Person</span><span·class="p"·data-group-id="0951214264-16">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</sp[·...·truncated·by·diffoscope;·len:·207,·SHA:·0462689189d421e2b29162ac24f8439c8a5c1576b197bb411a8688f1e9298ac8·...·]-17">)</span><span·class="p">,</span><span·class="w">
202 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1951305787-18">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1951305787-19">[</span><span·class[·...·truncated·by·diffoscope;·len:·218,·SHA:·63725a74986623c01529a3b02b5a3c8216cb791422f552d3dd67fe0304de18c9·...·]-18">)</span><span·class="p">.</span><span·class="w">202 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0951214264-18">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0951214264-19">[</span><span·class[·...·truncated·by·diffoscope;·len:·218,·SHA:·411c5260691daafdbf0d064b14304b1ca7d8987bf5c0e83101f2bf4fb255be1b·...·]-18">)</span><span·class="p">.</span><span·class="w">
  
203 </span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="1951305787-20">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="1951305787-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">203 </span><span·class="nf">print_occupation</span><span·class="p"·data-group-id="0951214264-20">(</span><span·class="n">PersonID</span><span·class="p"·data-group-id="0951214264-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
204 ····</span><span·class="p"·data-group-id="1951305787-21">[</span><span·class="n">Person</span><span·class="p"·data-group-id="1951305787-21">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</sp[·...·truncated·by·diffoscope;·len:·207,·SHA:·58cb26fefc151fdfdd812f8bd32fa830ad42c45a08c2cb8b2a6cc49dab668441·...·]-22">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="p"·data-group-id="0951214264-21">[</span><span·class="n">Person</span><span·class="p"·data-group-id="0951214264-21">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</sp[·...·truncated·by·diffoscope;·len:·207,·SHA:·7a3eb9b326ac6b2d2f770ec501b89857b60f456feaa36d0e8cb2fcd123209e11·...·]-22">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1951305787-23">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1951305787-24">[</span><span·class[·...·truncated·by·diffoscope;·len:·225,·SHA:·ec63cb981fcd4c2b89c74b8254a1f5c63861af285306165396ee88774e5b6814·...·]-23">)</span><span·class="p">.</span></code></pre><h3·id="non-persistent-database-storage"·class="section-heading">205 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0951214264-23">(</span><span·class="s">&quot;No·person·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0951214264-24">[</span><span·class[·...·truncated·by·diffoscope;·len:·225,·SHA:·5b43795dd08dfc8277a143ea977d31072d4956442b3c2682e4e1129b4a8b8f07·...·]-23">)</span><span·class="p">.</span></code></pre><h3·id="non-persistent-database-storage"·class="section-heading">
206 ··<a·href="#non-persistent-database-storage"·class="hover-link">206 ··<a·href="#non-persistent-database-storage"·class="hover-link">
207 ····<i·class="ri-link-m"·aria-hidden="true"></i>207 ····<i·class="ri-link-m"·aria-hidden="true"></i>
208 ··</a>208 ··</a>
209 ··<span·class="text">Non-Persistent·Database·Storage</span>209 ··<span·class="text">Non-Persistent·Database·Storage</span>
210 </h3>210 </h3>
211 <p>For·non-persistent·database·storage,·prefer·Ets·tables·over·Mnesia211 <p>For·non-persistent·database·storage,·prefer·Ets·tables·over·Mnesia
212 <code·class="inline">local_content</code>·tables.·Even·the·Mnesia·<code·class="inline">dirty_write</code>·operations·carry·a·fixed212 <code·class="inline">local_content</code>·tables.·Even·the·Mnesia·<code·class="inline">dirty_write</code>·operations·carry·a·fixed
Offset 226, 38 lines modifiedOffset 226, 38 lines modified
226 </h3>226 </h3>
227 <p>Assuming·an·Ets·table·that·uses·<code·class="inline">idno</code>·as·key·and·contains·the·following:</p><pre><code·class="text">[#person{idno·=·1,·name·=·&quot;Adam&quot;,··age·=·31,·occupation·=·&quot;mailman&quot;},227 <p>Assuming·an·Ets·table·that·uses·<code·class="inline">idno</code>·as·key·and·contains·the·following:</p><pre><code·class="text">[#person{idno·=·1,·name·=·&quot;Adam&quot;,··age·=·31,·occupation·=·&quot;mailman&quot;},
228 ·#person{idno·=·2,·name·=·&quot;Bryan&quot;,·age·=·31,·occupation·=·&quot;cashier&quot;},228 ·#person{idno·=·2,·name·=·&quot;Bryan&quot;,·age·=·31,·occupation·=·&quot;cashier&quot;},
229 ·#person{idno·=·3,·name·=·&quot;Bryan&quot;,·age·=·35,·occupation·=·&quot;banker&quot;},229 ·#person{idno·=·3,·name·=·&quot;Bryan&quot;,·age·=·35,·occupation·=·&quot;banker&quot;},
230 ·#person{idno·=·4,·name·=·&quot;Carl&quot;,··age·=·25,·occupation·=·&quot;mailman&quot;}]</code></pre><p>If·you·<em>must</em>·return·all·data·stored·in·the·Ets·table,·you·can·use230 ·#person{idno·=·4,·name·=·&quot;Carl&quot;,··age·=·25,·occupation·=·&quot;mailman&quot;}]</code></pre><p>If·you·<em>must</em>·return·all·data·stored·in·the·Ets·table,·you·can·use
231 <a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#tab2list/1"><code·class="inline">ets:tab2list/1</code></a>.·However,·usually·you·are·only·interested·in·a·subset·of·the231 <a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#tab2list/1"><code·class="inline">ets:tab2list/1</code></a>.·However,·usually·you·are·only·interested·in·a·subset·of·the
232 information·in·which·case·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#tab2list/1"><code·class="inline">ets:tab2list/1</code></a>·is·expensive.·If·you·only·want·to232 information·in·which·case·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#tab2list/1"><code·class="inline">ets:tab2list/1</code></a>·is·expensive.·If·you·only·want·to
233 extract·one·field·from·each·record,·for·example,·the·age·of·every·person,·then:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="1074676234-1">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1074676234-2">[</span><span·class="p"·data-group-id="1074676234-3">{</span><span·class="o">#</span><span·class="ss">person</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·06539e4754216ff3b16656966fbac64c7c629d4b1d43af0dc3a51b6f9c9d0f75·...·]-4">{</span><span·class="ss">idno</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">233 extract·one·field·from·each·record,·for·example,·the·age·of·every·person,·then:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="7053094540-1">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7053094540-2">[</span><span·class="p"·data-group-id="7053094540-3">{</span><span·class="o">#</span><span·class="ss">person</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·4fb122b31c8cacb2fd490f00b9fb7e38fd1f5117377bd21fe5684830c09b9c2d·...·]-4">{</span><span·class="ss">idno</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
234 ··························</span><span·class="ss">name</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">234 ··························</span><span·class="ss">name</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
235 ··························</span><span·class="ss">age</span><span·class="o">=</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">235 ··························</span><span·class="ss">age</span><span·class="o">=</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
236 ··························</span><span·class="ss">occupation</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="1074676234-4">}</span><span·class="p">,</span><span·class="w">236 ··························</span><span·class="ss">occupation</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="7053094540-4">}</span><span·class="p">,</span><span·class="w">
237 ················</span><span·class="p"·data-group-id="1074676234-5">[</span><span·class="p"·data-group-id="1074676234-5">]</span><span·class="p">,</span><span·class="w">237 ················</span><span·class="p"·data-group-id="7053094540-5">[</span><span·class="p"·data-group-id="7053094540-5">]</span><span·class="p">,</span><span·class="w">
238 ················</span><span·class="p"·data-group-id="1074676234-6">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="1074676234-6">]</span><span·class="p"·data-group-id="1074676234-3">}</span><span·class="p"·data-group-id="1074676234-2">]</span><span·class="p"·data-group-id="10746762[·...·truncated·by·diffoscope;·len:·433,·SHA:·0ba9d51ddc697096329790b418290710ccecd605edac1c78cac5eff4e6ee3d31·...·]3-1">)</span><span·class="p">,</span><span·class="w">238 ················</span><span·class="p"·data-group-id="7053094540-6">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="7053094540-6">]</span><span·class="p"·data-group-id="7053094540-3">}</span><span·class="p"·data-group-id="7053094540-2">]</span><span·class="p"·data-group-id="70530945[·...·truncated·by·diffoscope;·len:·433,·SHA:·b9a79d5deb26c1a0fb68dbd48fe82c3995b5ce3a760689104fe1f477a37eceb4·...·]3-1">)</span><span·class="p">,</span><span·class="w">
239 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="3475718743-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3475718743-3">(</span><span·class="n">X</span><span·class="p"·data-group-id="3475718743-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·919,·SHA:·c7bbec3f849f75cd271df45eabdfb67dfbc4d9a16659d0453f1dbc1b34f777ae·...·]-4">{</span><span·class="ss">idno</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">239 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="5953427283-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="5953427283-3">(</span><span·class="n">X</span><span·class="p"·data-group-id="5953427283-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·919,·SHA:·6e37e18923c0232e044a0480a8523eeacb5858dc82d8857e68f89d69b0d73e52·...·]-4">{</span><span·class="ss">idno</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
240 ··························</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Bryan&quot;</span><span·class="p">,</span><span·class="w">240 ··························</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Bryan&quot;</span><span·class="p">,</span><span·class="w">
241 ··························</span><span·class="ss">age</span><span·class="o">=</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">241 ··························</span><span·class="ss">age</span><span·class="o">=</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
242 ··························</span><span·class="ss">occupation</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="4541011670-4">}</span><span·class="p">,</span><span·class="w">242 ··························</span><span·class="ss">occupation</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="2210147746-4">}</span><span·class="p">,</span><span·class="w">
243 ················</span><span·class="p"·data-group-id="4541011670-5">[</span><span·class="p"·data-group-id="4541011670-5">]</span><span·class="p">,</span><span·class="w">243 ················</span><span·class="p"·data-group-id="2210147746-5">[</span><span·class="p"·data-group-id="2210147746-5">]</span><span·class="p">,</span><span·class="w">
244 ················</span><span·class="p"·data-group-id="4541011670-6">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4541011670-6">]</span><span·class="p"·data-group-id="4541011670-3">}</span><span·class="p"·data-group-id="4541011670-2">]</span><span·class="p"·data-group-id="45410116[·...·truncated·by·diffoscope;·len:·410,·SHA:·50c15f02fc238233466be03ff4a2ca5c10c0b9d4ce8fd8c9de1316a94009d9d4·...·]-1">)</span><span·class="p">,</span><span·class="w">244 ················</span><span·class="p"·data-group-id="2210147746-6">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="2210147746-6">]</span><span·class="p"·data-group-id="2210147746-3">}</span><span·class="p"·data-group-id="2210147746-2">]</span><span·class="p"·data-group-id="22101477[·...·truncated·by·diffoscope;·len:·410,·SHA:·597dbd2026a24661da50425b8cbe54ebdc4ef3cc3779615c000042274332449f·...·]-1">)</span><span·class="p">,</span><span·class="w">
245 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="0418206179-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0418206179-3">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="0418206179-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="k">case</span><span·class="w">·</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="w">·</span><span·class="k">of</span><span·class="w">245 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7724711918-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7724711918-3">(</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="7724711918-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="k">case</span><span·class="w">·</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">name</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
246 ································</span><span·class="s">&quot;Bryan&quot;</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">246 ································</span><span·class="s">&quot;Bryan&quot;</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
247 ····································</span><span·class="p"·data-group-id="0418206179-4">[</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">age</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="0418206179-4">]</span><span·class="p">;</span><span·class="w">247 ····································</span><span·class="p"·data-group-id="7724711918-4">[</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">person</span><span·class="p">.</span><span·class="ss">age</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="7724711918-4">]</span><span·class="p">;</span><span·class="w">
248 ·································</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">248 ·································</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
249 ·····································</span><span·class="n">Acc</span><span·class="w">249 ·····································</span><span·class="n">Acc</span><span·class="w">
250 ···························</span><span·class="k">end</span><span·class="w">250 ···························</span><span·class="k">end</span><span·class="w">
251 ·············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0418206179-5">[</span><span·class="p"·data-group-id="0418206179-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabList</span><span·class="p"·data-group-id="0418206179-2">)</span></code></pre><p>If·you·need·all·information·stored·in·the·Ets·table·about·persons·named·&quot;Bryan&quot;,251 ·············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7724711918-5">[</span><span·class="p"·data-group-id="7724711918-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabList</span><span·class="p"·data-group-id="7724711918-2">)</span></code></pre><p>If·you·need·all·information·stored·in·the·Ets·table·about·persons·named·&quot;Bryan&quot;,
252 then:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="5482399805-1">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5482399805-2">[</span><span·class="p"·data-group-id="5482399805-3">{</span><span·class="o">#</span><span·class="ss">person</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·db3bd5e25f8332f70ad890010e95c7e77960156ad10523442065f964c40dbe26·...·]-4">{</span><span·class="ss">idno</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">252 then:</p><p><strong>DO</strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="1382550607-1">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1382550607-2">[</span><span·class="p"·data-group-id="1382550607-3">{</span><span·class="o">#</span><span·class="ss">person</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·bfb07578b4fc0972b7970e8839dc374874d4d0a8ec4392675079102b50133430·...·]-4">{</span><span·class="ss">idno</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
253 ··························</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Bryan&quot;</span><span·class="p">,</span><span·class="w">253 ··························</span><span·class="ss">name</span><span·class="o">=</span><span·class="s">&quot;Bryan&quot;</span><span·class="p">,</span><span·class="w">
254 ··························</span><span·class="ss">age</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">254 ··························</span><span·class="ss">age</span><span·class="o">=</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
255 ··························</span><span·class="ss">occupation</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="5482399805-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5482399805-5">[</span><span·class="p"·data-group-id="5482399805-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5[·...·truncated·by·diffoscope;·len:·689,·SHA:·c74bf8fd53c1e65eac4194a39bcc121bbe68e7a1696f2bc5da35cdd625cfa46e·...·]-1">)</span><span·class="p">,</span><span·class="w">255 ··························</span><span·class="ss">occupation</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="1382550607-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1382550607-5">[</span><span·class="p"·data-group-id="1382550607-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1[·...·truncated·by·diffoscope;·len:·689,·SHA:·57cc41bc121179f5bf2078ab0339595d4f398c7254999625814cf2ef549360b2·...·]-1">)</span><span·class="p">,</span><span·class="w">
256 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">filter</span><span·class="p"·data-group-id="9612442655-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="9612442655-3">(</span><span·class="n">X</span><span·class="p"·data-group-id="9612442655-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·411,·SHA:·1e4419bb4bd08f498a4af548dd42f724a7a05230f2ce035255cb0111bee3ae26·...·]-2">)</span><span·class="p">,</span></code></pre><h3·id="ordered_set-tables"·class="section-heading">256 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">filter</span><span·class="p"·data-group-id="7295974083-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7295974083-3">(</span><span·class="n">X</span><span·class="p"·data-group-id="7295974083-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·411,·SHA:·32e37e5e83180cf2bf0dc4300fb7d774e96912c7d977d369a0eba9ac572f2a4d·...·]-2">)</span><span·class="p">,</span></code></pre><h3·id="ordered_set-tables"·class="section-heading">
257 ··<a·href="#ordered_set-tables"·class="hover-link">257 ··<a·href="#ordered_set-tables"·class="hover-link">
258 ····<i·class="ri-link-m"·aria-hidden="true"></i>258 ····<i·class="ri-link-m"·aria-hidden="true"></i>
259 ··</a>259 ··</a>
260 ··<span·class="text"><code·class="inline">ordered_set</code>·Tables</span>260 ··<span·class="text"><code·class="inline">ordered_set</code>·Tables</span>
261 </h3>261 </h3>
262 <p>If·the·data·in·the·table·is·to·be·accessed·so·that·the·order·of·the·keys·in·the262 <p>If·the·data·in·the·table·is·to·be·accessed·so·that·the·order·of·the·keys·in·the
263 table·is·significant,·the·table·type·<code·class="inline">ordered_set</code>·can·be·used·instead·of·the263 table·is·significant,·the·table·type·<code·class="inline">ordered_set</code>·can·be·used·instead·of·the
Offset 293, 20 lines modifiedOffset 293, 20 lines modified
293 Clearly,·the·second·table·would·have·to·be·kept·consistent·with·the·master293 Clearly,·the·second·table·would·have·to·be·kept·consistent·with·the·master
294 table.·Mnesia·can·do·this·for·you,·but·a·home-brew·index·table·can·be·very294 table.·Mnesia·can·do·this·for·you,·but·a·home-brew·index·table·can·be·very
295 efficient·compared·to·the·overhead·involved·in·using·Mnesia.</p><p>An·index·table·for·the·table·in·the·previous·examples·would·have·to·be·a·bag·(as295 efficient·compared·to·the·overhead·involved·in·using·Mnesia.</p><p>An·index·table·for·the·table·in·the·previous·examples·would·have·to·be·a·bag·(as
296 keys·would·appear·more·than·once)·and·can·have·the·following·contents:</p><pre><code·class="text">[#index_entry{name=&quot;Adam&quot;,·idno=1},296 keys·would·appear·more·than·once)·and·can·have·the·following·contents:</p><pre><code·class="text">[#index_entry{name=&quot;Adam&quot;,·idno=1},
297 ·#index_entry{name=&quot;Bryan&quot;,·idno=2},297 ·#index_entry{name=&quot;Bryan&quot;,·idno=2},
298 ·#index_entry{name=&quot;Bryan&quot;,·idno=3},298 ·#index_entry{name=&quot;Bryan&quot;,·idno=3},
299 ·#index_entry{name=&quot;Carl&quot;,·idno=4}]</code></pre><p>Given·this·index·table,·a·lookup·of·the·<code·class="inline">age</code>·fields·for·all·persons·named299 ·#index_entry{name=&quot;Carl&quot;,·idno=4}]</code></pre><p>Given·this·index·table,·a·lookup·of·the·<code·class="inline">age</code>·fields·for·all·persons·named
300 &quot;Bryan&quot;·can·be·done·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">MatchingIDs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="7093191092-1">(</span><span·class="n">IndexTable</span><span·class="p">,</span><span·class="s">&quot;Bryan&quot;</span><span·class="p"·data-group-id="7093191092-1">)</span><span·class="p">,</span><span·class="w">300 &quot;Bryan&quot;·can·be·done·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">MatchingIDs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="6184243840-1">(</span><span·class="n">IndexTable</span><span·class="p">,</span><span·class="s">&quot;Bryan&quot;</span><span·class="p"·data-group-id="6184243840-1">)</span><span·class="p">,</span><span·class="w">
301 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="7093191092-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7093191092-3">(</span><span·class="o">#</span><span·class="ss">index_entry</span><span·class="p"·data-group-id="7093191092-4">{</span><span·class="ss">idno</span><span·class="w[·...·truncated·by·diffoscope;·len:·177,·SHA:·139f6920048ae5a47ee3289d8185eab96869a6b26dec41097c01f01834b5303d·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">301 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="6184243840-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="6184243840-3">(</span><span·class="o">#</span><span·class="ss">index_entry</span><span·class="p"·data-group-id="6184243840-4">{</span><span·class="ss">idno</span><span·class="w[·...·truncated·by·diffoscope;·len:·177,·SHA:·8351b9b744482c37accd681d7f6e47b022b2a34d800fc1b78e4d61fae9aea9e7·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
302 ·················</span><span·class="p"·data-group-id="7093191092-5">[</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="7093191092-6">{</span><span·class="ss">age</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Age</span><s[·...·truncated·by·diffoscope;·len:·458,·SHA:·a3e6b7333602c884e829038e817c754a532d5d67e05289035c25d38efebe05d1·...·]-7">)</span><span·class="p">,</span><span·class="w">302 ·················</span><span·class="p"·data-group-id="6184243840-5">[</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6184243840-6">{</span><span·class="ss">age</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Age</span><s[·...·truncated·by·diffoscope;·len:·458,·SHA:·88d1e3edd651c4cf0d3c3c73e30178db332eb3cbc799d4f58fd44a4c9cdc49fb·...·]-7">)</span><span·class="p">,</span><span·class="w">
303 ·················</span><span·class="n">Age</span><span·class="w">303 ·················</span><span·class="n">Age</span><span·class="w">
304 ··········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">304 ··········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
305 ··········</span><span·class="n">MatchingIDs</span><span·class="p"·data-group-id="7093191092-2">)</span><span·class="p">,</span></code></pre><p>Notice·that·this·code·does·not·use·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#match/2"><code·class="inline">ets:match/2</code></a>,·but·instead·uses·the305 ··········</span><span·class="n">MatchingIDs</span><span·class="p"·data-group-id="6184243840-2">)</span><span·class="p">,</span></code></pre><p>Notice·that·this·code·does·not·use·<a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#match/2"><code·class="inline">ets:match/2</code></a>,·but·instead·uses·the
306 <a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#lookup/2"><code·class="inline">ets:lookup/2</code></a>·call.·The·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#map/2"><code·class="inline">lists:map/2</code></a>·call·is·only·used·to·traverse·the·<code·class="inline">idno</code>s306 <a·href="../../lib/stdlib-6.2.2/doc/html/ets.html#lookup/2"><code·class="inline">ets:lookup/2</code></a>·call.·The·<a·href="../../lib/stdlib-6.2.2/doc/html/lists.html#map/2"><code·class="inline">lists:map/2</code></a>·call·is·only·used·to·traverse·the·<code·class="inline">idno</code>s
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184 ······<p·class="built-using">184 ······<p·class="built-using">
185 ········Built·using185 ········Built·using
186 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the186 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
188 ······</p>188 ······</p>
189 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>189 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
190 ····</footer>190 ····</footer>
191 ··</div>191 ··</div>
192 </main>192 </main>
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238 and·optional·<code·class="inline">(=&gt;)</code>·association·types.·If·an·association·type·is·mandatory,·an238 and·optional·<code·class="inline">(=&gt;)</code>·association·types.·If·an·association·type·is·mandatory,·an
239 association·with·that·type·needs·to·be·present.·In·the·case·of·an·optional239 association·with·that·type·needs·to·be·present.·In·the·case·of·an·optional
240 association·type·it·is·not·required·for·the·key·type·to·be·present.</p><p>The·notation·<code·class="inline">#{}</code>·specifies·the·singleton·type·for·the·empty·map.·Note·that240 association·type·it·is·not·required·for·the·key·type·to·be·present.</p><p>The·notation·<code·class="inline">#{}</code>·specifies·the·singleton·type·for·the·empty·map.·Note·that
241 this·notation·is·not·a·shorthand·for·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:map/0"><code·class="inline">map/0</code></a>·type.</p><p>For·convenience,·the·following·types·are·also·built-in.·They·can·be·thought·as241 this·notation·is·not·a·shorthand·for·the·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:map/0"><code·class="inline">map/0</code></a>·type.</p><p>For·convenience,·the·following·types·are·also·built-in.·They·can·be·thought·as
242 predefined·aliases·for·the·type·unions·also·shown·in·the·table.</p><p><a·href=""·id="builtin_types"></a></p><table><thead><tr><th·style="text-align:·left;"><em>Built-in·type</em></th><th·style="text-align:·left;"><em>Defined·as</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:term/0"><code·class="inline">term/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:any/0"><code·class="inline">any/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:binary/0"><code·class="inline">binary/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:_*8&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_binary/0"><code·class="inline">nonempty_binary/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:8,·_:_*8&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:bitstring/0"><code·class="inline">bitstring/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:_*1&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_bitstring/0"><code·class="inline">nonempty_bitstring/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:1,·_:_*1&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:boolean/0"><code·class="inline">boolean/0</code></a></td><td·style="text-align:·left;"><code·class="inline">'false'</code>·|·<code·class="inline">'true'</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..255</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:char/0"><code·class="inline">char/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..16#10ffff</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nil/0"><code·class="inline">nil/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:number/0"><code·class="inline">number/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>·|·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:float/0"><code·class="inline">float/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:list/0"><code·class="inline">list/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[any()]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:maybe_improper_list/0"><code·class="inline">maybe_improper_list/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:maybe_improper_list/2"><code·class="inline">maybe_improper_list(any(),·any())</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_list/0"><code·class="inline">nonempty_list/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_list/1"><code·class="inline">nonempty_list(any())</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:string/0"><code·class="inline">string/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[char()]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_string/0"><code·class="inline">nonempty_string/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[char(),...]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:iodata/0"><code·class="inline">iodata/0</code></a></td><td·style="text-align:·left;"><code·class="inline">iolist()</code>·|·<code·class="inline">binary()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:iolist/0"><code·class="inline">iolist/0</code></a></td><td·style="text-align:·left;"><code·class="inline">maybe_improper_list(byte()</code>·|·<code·class="inline">binary()</code>·|·<code·class="inline">iolist(),·binary()</code>·|·<code·class="inline">[])</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:map/0"><code·class="inline">map/0</code></a></td><td·style="text-align:·left;"><code·class="inline">#{any()·=&gt;·any()}</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:function/0"><code·class="inline">function/0</code></a></td><td·style="text-align:·left;"><code·class="inline">fun()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:module/0"><code·class="inline">module/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:atom/0"><code·class="inline">atom/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:mfa/0"><code·class="inline">mfa/0</code></a></td><td·style="text-align:·left;"><code·class="inline">{module(),atom(),arity()}</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:arity/0"><code·class="inline">arity/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..255</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:identifier/0"><code·class="inline">identifier/0</code></a></td><td·style="text-align:·left;"><code·class="inline">pid()</code>·|·<code·class="inline">port()</code>·|·<code·class="inline">reference()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#node/0"><code·class="inline">node/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:atom/0"><code·class="inline">atom/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:timeout/0"><code·class="inline">timeout/0</code></a></td><td·style="text-align:·left;"><code·class="inline">'infinity'</code>·|·<code·class="inline">non_neg_integer()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:no_return/0"><code·class="inline">no_return/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:none/0"><code·class="inline">none/0</code></a></td></tr></tbody></table><p><em>Table:·Built-in·types,·predefined·aliases</em></p><p>In·addition,·the·following·three·built-in·types·exist·and·can·be·thought·as242 predefined·aliases·for·the·type·unions·also·shown·in·the·table.</p><p><a·href=""·id="builtin_types"></a></p><table><thead><tr><th·style="text-align:·left;"><em>Built-in·type</em></th><th·style="text-align:·left;"><em>Defined·as</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:term/0"><code·class="inline">term/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:any/0"><code·class="inline">any/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:binary/0"><code·class="inline">binary/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:_*8&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_binary/0"><code·class="inline">nonempty_binary/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:8,·_:_*8&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:bitstring/0"><code·class="inline">bitstring/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:_*1&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_bitstring/0"><code·class="inline">nonempty_bitstring/0</code></a></td><td·style="text-align:·left;"><code·class="inline">&lt;&lt;_:1,·_:_*1&gt;&gt;</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:boolean/0"><code·class="inline">boolean/0</code></a></td><td·style="text-align:·left;"><code·class="inline">'false'</code>·|·<code·class="inline">'true'</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..255</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:char/0"><code·class="inline">char/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..16#10ffff</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nil/0"><code·class="inline">nil/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:number/0"><code·class="inline">number/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>·|·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:float/0"><code·class="inline">float/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:list/0"><code·class="inline">list/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[any()]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:maybe_improper_list/0"><code·class="inline">maybe_improper_list/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:maybe_improper_list/2"><code·class="inline">maybe_improper_list(any(),·any())</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_list/0"><code·class="inline">nonempty_list/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_list/1"><code·class="inline">nonempty_list(any())</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:string/0"><code·class="inline">string/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[char()]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:nonempty_string/0"><code·class="inline">nonempty_string/0</code></a></td><td·style="text-align:·left;"><code·class="inline">[char(),...]</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:iodata/0"><code·class="inline">iodata/0</code></a></td><td·style="text-align:·left;"><code·class="inline">iolist()</code>·|·<code·class="inline">binary()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:iolist/0"><code·class="inline">iolist/0</code></a></td><td·style="text-align:·left;"><code·class="inline">maybe_improper_list(byte()</code>·|·<code·class="inline">binary()</code>·|·<code·class="inline">iolist(),·binary()</code>·|·<code·class="inline">[])</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:map/0"><code·class="inline">map/0</code></a></td><td·style="text-align:·left;"><code·class="inline">#{any()·=&gt;·any()}</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:function/0"><code·class="inline">function/0</code></a></td><td·style="text-align:·left;"><code·class="inline">fun()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:module/0"><code·class="inline">module/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:atom/0"><code·class="inline">atom/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:mfa/0"><code·class="inline">mfa/0</code></a></td><td·style="text-align:·left;"><code·class="inline">{module(),atom(),arity()}</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:arity/0"><code·class="inline">arity/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..255</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:identifier/0"><code·class="inline">identifier/0</code></a></td><td·style="text-align:·left;"><code·class="inline">pid()</code>·|·<code·class="inline">port()</code>·|·<code·class="inline">reference()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#node/0"><code·class="inline">node/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:atom/0"><code·class="inline">atom/0</code></a></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:timeout/0"><code·class="inline">timeout/0</code></a></td><td·style="text-align:·left;"><code·class="inline">'infinity'</code>·|·<code·class="inline">non_neg_integer()</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:no_return/0"><code·class="inline">no_return/0</code></a></td><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:none/0"><code·class="inline">none/0</code></a></td></tr></tbody></table><p><em>Table:·Built-in·types,·predefined·aliases</em></p><p>In·addition,·the·following·three·built-in·types·exist·and·can·be·thought·as
243 defined·below,·though·strictly·their·&quot;type·definition&quot;·is·not·valid·syntax243 defined·below,·though·strictly·their·&quot;type·definition&quot;·is·not·valid·syntax
244 according·to·the·type·language·defined·above.</p><table><thead><tr><th·style="text-align:·left;"><em>Built-in·type</em></th><th·style="text-align:·left;"><em>Can·be·thought·defined·by·the·syntax</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:pos_integer/0"><code·class="inline">pos_integer/0</code></a></td><td·style="text-align:·left;"><code·class="inline">1..</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:neg_integer/0"><code·class="inline">neg_integer/0</code></a></td><td·style="text-align:·left;"><code·class="inline">..-1</code></td></tr></tbody></table><p><em>Table:·Additional·built-in·types</em></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·following·built-in·list·types·also·exist,·but·they·are·expected·to·be244 according·to·the·type·language·defined·above.</p><table><thead><tr><th·style="text-align:·left;"><em>Built-in·type</em></th><th·style="text-align:·left;"><em>Can·be·thought·defined·by·the·syntax</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></td><td·style="text-align:·left;"><code·class="inline">0..</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:pos_integer/0"><code·class="inline">pos_integer/0</code></a></td><td·style="text-align:·left;"><code·class="inline">1..</code></td></tr><tr><td·style="text-align:·left;"><a·href="../../erts-15.2.6/doc/html/erlang.html#t:neg_integer/0"><code·class="inline">neg_integer/0</code></a></td><td·style="text-align:·left;"><code·class="inline">..-1</code></td></tr></tbody></table><p><em>Table:·Additional·built-in·types</em></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·following·built-in·list·types·also·exist,·but·they·are·expected·to·be
245 rarely·used.·Hence,·they·have·long·names:</p></section><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">nonempty_maybe_improper_list</span><span·class="p"·data-group-id="8700463170-1">(</span><span·class="p"·data-group-id="8700463170-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">nonempty_maybe_improper_list</span><span·class="p"·data-group-id="87[·...·truncated·by·diffoscope;·len:·375,·SHA:·2b219e3ebbd820daa327f912eda194d03e9f984af3f76e674a1accbed56d77a6·...·]-2">)</span><span·class="w">245 rarely·used.·Hence,·they·have·long·names:</p></section><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">nonempty_maybe_improper_list</span><span·class="p"·data-group-id="1734006539-1">(</span><span·class="p"·data-group-id="1734006539-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">nonempty_maybe_improper_list</span><span·class="p"·data-group-id="17[·...·truncated·by·diffoscope;·len:·375,·SHA:·686c0d9034d21a1b708795d68ef5a97e033f4ebb2238ec04bfbe6a9fafe55cb6·...·]-2">)</span><span·class="w">
246 </span><span·class="nf">nonempty_improper_list</span><span·class="p"·data-group-id="8700463170-5">(</span><span·class="n">Type1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type2</span><span·class="p"·data-group-id="8700463170-5">)</span><span·class="w">246 </span><span·class="nf">nonempty_improper_list</span><span·class="p"·data-group-id="1734006539-5">(</span><span·class="n">Type1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type2</span><span·class="p"·data-group-id="1734006539-5">)</span><span·class="w">
247 </span><span·class="nf">nonempty_maybe_improper_list</span><span·class="p"·data-group-id="8700463170-6">(</span><span·class="n">Type1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type2</span><span·class="p"·data-group-id="8700463170-6">)</span></code></pre><p>where·the·last·two·types·define·the·set·of·Erlang·terms·one·would·expect.</p><p>Also·for·convenience,·record·notation·is·allowed·to·be·used.·Records·are247 </span><span·class="nf">nonempty_maybe_improper_list</span><span·class="p"·data-group-id="1734006539-6">(</span><span·class="n">Type1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type2</span><span·class="p"·data-group-id="1734006539-6">)</span></code></pre><p>where·the·last·two·types·define·the·set·of·Erlang·terms·one·would·expect.</p><p>Also·for·convenience,·record·notation·is·allowed·to·be·used.·Records·are
248 shorthands·for·the·corresponding·tuples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Record</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Erlang_Atom</span><span·class="p"·data-group-id="3633897064-1">{</span><span·class="p"·data-group-id="3633897064-1">}</span><span·class="w">248 shorthands·for·the·corresponding·tuples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Record</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Erlang_Atom</span><span·class="p"·data-group-id="0655985804-1">{</span><span·class="p"·data-group-id="0655985804-1">}</span><span·class="w">
249 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Erlang_Atom</span><span·class="p"·data-group-id="3633897064-2">{</span><span·class="n">Fields</span><span·class="p"·data-group-id="3633897064-2">}</span></code></pre><p>Records·are·extended·to·possibly·contain·type·information.·This·is·described·in249 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Erlang_Atom</span><span·class="p"·data-group-id="0655985804-2">{</span><span·class="n">Fields</span><span·class="p"·data-group-id="0655985804-2">}</span></code></pre><p>Records·are·extended·to·possibly·contain·type·information.·This·is·described·in
250 <a·href="typespec.html#typeinrecords">Type·Information·in·Record·Declarations</a>.</p><h3·id="redefining-built-in-types"·class="section-heading">250 <a·href="typespec.html#typeinrecords">Type·Information·in·Record·Declarations</a>.</p><h3·id="redefining-built-in-types"·class="section-heading">
251 ··<a·href="#redefining-built-in-types"·class="hover-link">251 ··<a·href="#redefining-built-in-types"·class="hover-link">
252 ····<i·class="ri-link-m"·aria-hidden="true"></i>252 ····<i·class="ri-link-m"·aria-hidden="true"></i>
253 ··</a>253 ··</a>
254 ··<span·class="text">Redefining·built-in·types</span>254 ··<span·class="text">Redefining·built-in·types</span>
255 </h3>255 </h3>
256 <section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Starting·from·Erlang/OTP·26,·it·is·permitted·to·define·a·type·having·the·same256 <section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Starting·from·Erlang/OTP·26,·it·is·permitted·to·define·a·type·having·the·same
257 name·as·a·built-in·type.</p></section><p>It·is·recommended·to·avoid·deliberately·reusing·built-in·names·because·it·can·be257 name·as·a·built-in·type.</p></section><p>It·is·recommended·to·avoid·deliberately·reusing·built-in·names·because·it·can·be
258 confusing.·However,·when·an·Erlang/OTP·release·introduces·a·new·type,·code·that258 confusing.·However,·when·an·Erlang/OTP·release·introduces·a·new·type,·code·that
259 happened·to·define·its·own·type·having·the·same·name·will·continue·to·work.</p><p>As·an·example,·imagine·that·the·Erlang/OTP·42·release·introduces·a·new·type259 happened·to·define·its·own·type·having·the·same·name·will·continue·to·work.</p><p>As·an·example,·imagine·that·the·Erlang/OTP·42·release·introduces·a·new·type
260 <code·class="inline">gadget()</code>·defined·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">gadget</span><span·class="p"·data-group-id="8091092478-1">(</span><span·class="p"·data-group-id="8091092478-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8091092478-2">{</span><span·class="ss">&#39;gadget&#39[·...·truncated·by·diffoscope;·len:·236,·SHA:·f1eacde3a91d5f05c096ab889a67f24da75ea8b0c0e9a21357e926801df8edee·...·]-2">}</span><span·class="p">.</span></code></pre><p>Further·imagine·that·some·code·has·its·own·(different)·definition·of·<code·class="inline">gadget()</code>,260 <code·class="inline">gadget()</code>·defined·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">gadget</span><span·class="p"·data-group-id="5525925147-1">(</span><span·class="p"·data-group-id="5525925147-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="5525925147-2">{</span><span·class="ss">&#39;gadget&#39[·...·truncated·by·diffoscope;·len:·236,·SHA:·e4afcb66a27578ea4998a1c9757cd72d92ac8b730df803e1fe66ac569e8d6496·...·]-2">}</span><span·class="p">.</span></code></pre><p>Further·imagine·that·some·code·has·its·own·(different)·definition·of·<code·class="inline">gadget()</code>,
261 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">gadget</span><span·class="p"·data-group-id="7922469635-1">(</span><span·class="p"·data-group-id="7922469635-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="7922469635-2">#{</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·e9a884b6a3031a06918cbece2724c9a4b64bbbda750299f1707eca1d646db23b·...·]-2">}</span><span·class="p">.</span></code></pre><p>Since·redefinitions·are·allowed,·the·code·will·still·compile·(but·with·a261 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">gadget</span><span·class="p"·data-group-id="1499906740-1">(</span><span·class="p"·data-group-id="1499906740-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1499906740-2">#{</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·252e6caad005df2bf29082f2ef686da1d697458e628688c89d85ca86ad4e0ab8·...·]-2">}</span><span·class="p">.</span></code></pre><p>Since·redefinitions·are·allowed,·the·code·will·still·compile·(but·with·a
262 warning),·and·Dialyzer·will·not·emit·any·additional·warnings.</p><h2·id="type-declarations-of-user-defined-types"·class="section-heading">262 warning),·and·Dialyzer·will·not·emit·any·additional·warnings.</p><h2·id="type-declarations-of-user-defined-types"·class="section-heading">
263 ··<a·href="#type-declarations-of-user-defined-types"·class="hover-link">263 ··<a·href="#type-declarations-of-user-defined-types"·class="hover-link">
264 ····<i·class="ri-link-m"·aria-hidden="true"></i>264 ····<i·class="ri-link-m"·aria-hidden="true"></i>
265 ··</a>265 ··</a>
266 ··<span·class="text">Type·Declarations·of·User-Defined·Types</span>266 ··<span·class="text">Type·Declarations·of·User-Defined·Types</span>
267 </h2>267 </h2>
268 <p>As·seen,·the·basic·syntax·of·a·type·is·an·atom·followed·by·closed·parentheses.268 <p>As·seen,·the·basic·syntax·of·a·type·is·an·atom·followed·by·closed·parentheses.
269 New·types·are·declared·using·<code·class="inline">-type</code>·and·<code·class="inline">-opaque</code>·attributes·as·in·the269 New·types·are·declared·using·<code·class="inline">-type</code>·and·<code·class="inline">-opaque</code>·attributes·as·in·the
270 following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">my_struct_type</span><span·class="p"·data-group-id="3513140514-1">(</span><span·class="p"·data-group-id="3513140514-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">.</span><span·class="w">270 following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">my_struct_type</span><span·class="p"·data-group-id="6434279758-1">(</span><span·class="p"·data-group-id="6434279758-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">.</span><span·class="w">
271 </span><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">my_opaq_type</span><span·class="p"·data-group-id="3513140514-2">(</span><span·class="p"·data-group-id="3513140514-2">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">.</span></code></pre><p>The·type·name·is·the·atom·<code·class="inline">my_struct_type</code>,·followed·by·parentheses.·<code·class="inline">Type</code>·is·a271 </span><span·class="p">-</span><span·class="na">opaque</span><span·class="w">·</span><span·class="nf">my_opaq_type</span><span·class="p"·data-group-id="6434279758-2">(</span><span·class="p"·data-group-id="6434279758-2">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">.</span></code></pre><p>The·type·name·is·the·atom·<code·class="inline">my_struct_type</code>,·followed·by·parentheses.·<code·class="inline">Type</code>·is·a
272 type·as·defined·in·the·previous·section.·A·current·restriction·is·that·<code·class="inline">Type</code>272 type·as·defined·in·the·previous·section.·A·current·restriction·is·that·<code·class="inline">Type</code>
273 can·contain·only·predefined·types,·or·user-defined·types·which·are·either·of·the273 can·contain·only·predefined·types,·or·user-defined·types·which·are·either·of·the
274 following:</p><ul><li>Module-local·type,·that·is,·with·a·definition·that·is·present·in·the·code·of274 following:</p><ul><li>Module-local·type,·that·is,·with·a·definition·that·is·present·in·the·code·of
275 the·module</li><li>Remote·type,·that·is,·type·defined·in,·and·exported·by,·other·modules;·more275 the·module</li><li>Remote·type,·that·is,·type·defined·in,·and·exported·by,·other·modules;·more
276 about·this·soon.</li></ul><p>For·module-local·types,·the·restriction·that·their·definition·exists·in·the276 about·this·soon.</li></ul><p>For·module-local·types,·the·restriction·that·their·definition·exists·in·the
277 module·is·enforced·by·the·compiler·and·results·in·a·compilation·error.·(A277 module·is·enforced·by·the·compiler·and·results·in·a·compilation·error.·(A
278 similar·restriction·currently·exists·for·records.)</p><p>Type·declarations·can·also·be·parameterized·by·including·type·variables·between278 similar·restriction·currently·exists·for·records.)</p><p>Type·declarations·can·also·be·parameterized·by·including·type·variables·between
279 the·parentheses.·The·syntax·of·type·variables·is·the·same·as·Erlang·variables,279 the·parentheses.·The·syntax·of·type·variables·is·the·same·as·Erlang·variables,
280 that·is,·starts·with·an·upper-case·letter.·These·variables·is·to280 that·is,·starts·with·an·upper-case·letter.·These·variables·is·to
281 appear·on·the·RHS·of·the·definition.·A·concrete·example·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">orddict</span><span·class="p"·data-group-id="9280268251-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="9280268251-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9280268251-2">[</span><span·class="p"·data-group-id="9280268251-3">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="9280268251-3">}</span><span·class="p"·data-group-id="9280268251-2">]</span><span·class="p">.</span></code></pre><p>A·module·can·export·some·types·to·declare·that·other·modules·are·allowed·to 
282 refer·to·them·as·<em>remote·types</em>.·This·declaration·has·the·following·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">export_type</span><span·class="p"·data-group-id="0330860509-1">(</span><span·class=[·...·truncated·by·diffoscope;·len:·1338,·SHA:·d68ed4d2189a3aeeec4a1a2ab70160cb4480535bc6f0b9ddd0cd18edc3d4b34e·...·]·to281 appear·on·the·RHS·of·the·definition.·A·concrete·example·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">orddict</span><span·class="p"·data-group-id="11[·...·truncated·by·diffoscope;·len:·693,·SHA:·48477f059bbf8259be15f379a39fde06b99b1d0f9efda8961c9178ab096049cd·...·]·to
 282 refer·to·them·as·<em>remote·types</em>.·This·declaration·has·the·following·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">export_type</span><span·class="p"·data-group-id="1056095888-1">(</span><span·class="p"·data-group-id="1056095888-2">[</span><span·class="n">T1</span><span·class="o">/</span><span·class="n">A1</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tk</span><span·class="o">/</span><span·class="n">Ak</span><span·class="p"·data-group-id="1056095888-2">]</span><span·class="p"·data-group-id="1056095888-1">)</span><span·class="p">.</span></code></pre><p>Here·the·<code·class="inline">Ti</code>s·are·atoms·(the·name·of·the·type)·and·the·<code·class="inline">Ai</code>s·are·their·arguments.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">export_type</span><span·class="p"·data-group-id="1861355798-1">(</span><span·class="p"·data-group-id="1861355798-2">[</span><span·class="ss">my_struct_type</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">orddict</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="1861355798-2">]</span><span·class="p"·data-group-id="1861355798-1">)</span><span·class="p">.</span></code></pre><p>Assuming·that·these·types·are·exported·from·module·<code·class="inline">'mod'</code>,·you·can·refer·to
283 them·from·other·modules·using·remote·type·expressions·like·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mod</span><span·class="p">:</span><span·class="nf">my_struct_type</span><span·class="p"·data-group-id="8982944190-1">(</span><span·class="p"·data-group-id="8982944190-1">)</span><span·class="w">283 them·from·other·modules·using·remote·type·expressions·like·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mod</span><span·class="p">:</span><span·class="nf">my_struct_type</span><span·class="p"·data-group-id="5009090906-1">(</span><span·class="p"·data-group-id="5009090906-1">)</span><span·class="w">
284 </span><span·class="nc">mod</span><span·class="p">:</span><span·class="nf">orddict</span><span·class="p"·data-group-id="8982944190-2">(</span><span·class="nf">atom</span><span·class="p"·data-group-id="8982944190-3">(</span><span·class="p"·data-group-id="8982944190-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·123,·SHA:·9aba0007002f3ccb649a13cfcd29e5bfb905635d37e8ad675976448ab9cfe8e7·...·]-2">)</span></code></pre><p>It·is·not·allowed·to·refer·to·types·that·are·not·declared·as·exported.</p><p>Types·declared·as·<code·class="inline">opaque</code>·represent·sets·of·terms·whose·structure·is·not284 </span><span·class="nc">mod</span><span·class="p">:</span><span·class="nf">orddict</span><span·class="p"·data-group-id="5009090906-2">(</span><span·class="nf">atom</span><span·class="p"·data-group-id="5009090906-3">(</span><span·class="p"·data-group-id="5009090906-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·123,·SHA:·7f6997e7cdd13cc40462dc04eb883296a4e6b7e445ca90622eebc6b1ead6ccad·...·]-2">)</span></code></pre><p>It·is·not·allowed·to·refer·to·types·that·are·not·declared·as·exported.</p><p>Types·declared·as·<code·class="inline">opaque</code>·represent·sets·of·terms·whose·structure·is·not
285 supposed·to·be·visible·from·outside·of·their·defining·module.·That·is,·only·the285 supposed·to·be·visible·from·outside·of·their·defining·module.·That·is,·only·the
286 module·defining·them·is·allowed·to·depend·on·their·term·structure.·Consequently,286 module·defining·them·is·allowed·to·depend·on·their·term·structure.·Consequently,
287 such·types·do·not·make·much·sense·as·module·local·-·module·local·types·are·not287 such·types·do·not·make·much·sense·as·module·local·-·module·local·types·are·not
288 accessible·by·other·modules·anyway·-·and·is·always·to·be·exported.</p><p>Read·more·on·<a·href="opaques.html">Opaques</a></p><p><a·href=""·id="typeinrecords"></a></p><h2·id="type-information-in-record-declarations"·class="section-heading">288 accessible·by·other·modules·anyway·-·and·is·always·to·be·exported.</p><p>Read·more·on·<a·href="opaques.html">Opaques</a></p><p><a·href=""·id="typeinrecords"></a></p><h2·id="type-information-in-record-declarations"·class="section-heading">
289 ··<a·href="#type-information-in-record-declarations"·class="hover-link">289 ··<a·href="#type-information-in-record-declarations"·class="hover-link">
290 ····<i·class="ri-link-m"·aria-hidden="true"></i>290 ····<i·class="ri-link-m"·aria-hidden="true"></i>
291 ··</a>291 ··</a>
292 ··<span·class="text">Type·Information·in·Record·Declarations</span>292 ··<span·class="text">Type·Information·in·Record·Declarations</span>
293 </h2>293 </h2>
294 <p>The·types·of·record·fields·can·be·specified·in·the·declaration·of·the·record.294 <p>The·types·of·record·fields·can·be·specified·in·the·declaration·of·the·record.
295 The·syntax·for·this·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="2959177998-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2959177998-2">{</span><span·class="ss">field1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><spa[·...·truncated·by·diffoscope;·len:·422,·SHA:·85751aa17570ff27f681994328772d82a6be29cb3574a1b44f9fb4fc93faf923·...·]-1">)</span><span·class="p">.</span></code></pre><p>For·fields·without·type·annotations,·their·type·defaults·to·<code·class="inline">any()</code>.·That·is,·the295 The·syntax·for·this·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8546242859-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8546242859-2">{</span><span·class="ss">field1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><spa[·...·truncated·by·diffoscope;·len:·422,·SHA:·7ef884f656be22002af58bf4601512a93a8de0d1a47d3b2a92d0a4f00c097b22·...·]-1">)</span><span·class="p">.</span></code></pre><p>For·fields·without·type·annotations,·their·type·defaults·to·<code·class="inline">any()</code>.·That·is,·the
296 previous·example·is·a·shorthand·for·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="3467281870-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3467281870-2">{</span><span·class="ss">field1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><spa[·...·truncated·by·diffoscope;·len:·651,·SHA:·639dc5b89afbc02df6c4fafa9fe8d46510224c44a36e21e0b6caa7852e09733c·...·]-1">)</span><span·class="p">.</span></code></pre><p>In·the·presence·of·initial·values·for·fields,·the·type·must·be·declared·after296 previous·example·is·a·shorthand·for·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5942005938-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5942005938-2">{</span><span·class="ss">field1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><spa[·...·truncated·by·diffoscope;·len:·651,·SHA:·67f37f689a619e9bbee458a9dff37d47a8098a5d56a72e09578381873cf4fe15·...·]-1">)</span><span·class="p">.</span></code></pre><p>In·the·presence·of·initial·values·for·fields,·the·type·must·be·declared·after
297 the·initialization,·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8661529248-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8661529248-2">{</span><span·class="ss">field1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·698,·SHA:·cc3f841ad6264a15d4076971161967ea549a805f824ad993dd43fe30841de642·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·initial·values·for·fields·are·to·be·compatible·with·(that·is,·a·member·of)297 the·initialization,·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5211893882-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5211893882-2">{</span><span·class="ss">field1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·698,·SHA:·bba7d5d533821865b5db5d407826e8c39a989ab29fe9111fbc30010ef0b470b9·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·initial·values·for·fields·are·to·be·compatible·with·(that·is,·a·member·of)
298 the·corresponding·types.·This·is·checked·by·the·compiler·and·results·in·a298 the·corresponding·types.·This·is·checked·by·the·compiler·and·results·in·a
299 compilation·error·if·a·violation·is·detected.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·19,·for·fields·without·initial·values,·the·singleton·type299 compilation·error·if·a·violation·is·detected.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·19,·for·fields·without·initial·values,·the·singleton·type
300 <code·class="inline">'undefined'</code>·was·added·to·all·declared·types.·In·other·words,·the·following300 <code·class="inline">'undefined'</code>·was·added·to·all·declared·types.·In·other·words,·the·following
301 two·record·declarations·had·identical·effects:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1532442191-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1532442191-2">{</span><span·class="ss">f1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·239,·SHA:·2afafeea691f1f34ce2636dbca058d2920162fea6d347b8004b820548f7b5753·...·]-3">)</span><span·class="p">,</span><span·class="w">301 two·record·declarations·had·identical·effects:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7887683688-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7887683688-2">{</span><span·class="ss">f1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·239,·SHA:·5df674f70922fe6e306204cbdc507b81969e02ac5b83a877a79f6aee63450618·...·]-3">)</span><span·class="p">,</span><span·class="w">
302 ·············</span><span·class="ss">f2</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">float</span><span·class="p"·data-group-id="1532442191-4">(</span><span·class="p"·data-group-id="1532442191-4">)</span><span·class="p">,</span><span·class="w">302 ·············</span><span·class="ss">f2</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">float</span><span·class="p"·data-group-id="7887683688-4">(</span><span·class="p"·data-group-id="7887683688-4">)</span><span·class="p">,</span><span·class="w">
303 ·············</span><span·class="ss">f3</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="1532442191-2">}</span><span·class="p"·data-group-id="1532442191-1">)</span><span·class="p">.</span><span·class="w">303 ·············</span><span·class="ss">f3</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="7887683688-2">}</span><span·class="p"·data-group-id="7887683688-1">)</span><span·class="p">.</span><span·class="w">
304 </span><span·class="w">304 </span><span·class="w">
305 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1532442191-5">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1532442191-6">{</span><span·class="ss">f1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·239,·SHA:·0fd75d668bf2e4b410d6b5d26a8bcc16419b5259b0b80e769151d75042ed6f52·...·]-7">)</span><span·class="p">,</span><span·class="w">305 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7887683688-5">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7887683688-6">{</span><span·class="ss">f1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·239,·SHA:·578fae8d463b9c3f4be81553cdc51a8e4b8ae9d406a0340b45652b4926357502·...·]-7">)</span><span·class="p">,</span><span·class="w">
306 ··············</span><span·class="ss">f2</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;undefined&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">float</span><span·class="p"·data-group-id="1532442191-8">(</span><span·class="p"·data-group-id="1532442191-8">)</span><span·class="p">,</span><span·class="w">306 ··············</span><span·class="ss">f2</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;undefined&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">float</span><span·class="p"·data-group-id="7887683688-8">(</span><span·class="p"·data-group-id="7887683688-8">)</span><span·class="p">,</span><span·class="w">
307 ··············</span><span·class="ss">f3</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;undefined&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="1532442191-6">}</span><span·class="p"·data-group-id="1532442191-5">)</span><span·class="p">.</span></code></pre><p>This·is·no·longer·the·case.·If·you·require·<code·class="inline">'undefined'</code>·in·your·record·field307 ··············</span><span·class="ss">f3</span><span·class="w">······</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;undefined&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="7887683688-6">}</span><span·class="p"·data-group-id="7887683688-5">)</span><span·class="p">.</span></code></pre><p>This·is·no·longer·the·case.·If·you·require·<code·class="inline">'undefined'</code>·in·your·record·field
308 type,·you·must·explicitly·add·it·to·the·typespec,·as·in·the·2nd·example.</p></section><p>Any·record,·containing·type·information·or·not,·once·defined,·can·be·used·as·a308 type,·you·must·explicitly·add·it·to·the·typespec,·as·in·the·2nd·example.</p></section><p>Any·record,·containing·type·information·or·not,·once·defined,·can·be·used·as·a
309 type·using·the·following·syntax:</p><pre><code·class="text">#rec{}</code></pre><p>In·addition,·the·record·fields·can·be·further·specified·when·using·a·record·type309 type·using·the·following·syntax:</p><pre><code·class="text">#rec{}</code></pre><p>In·addition,·the·record·fields·can·be·further·specified·when·using·a·record·type
310 by·adding·type·information·about·the·field·as·follows:</p><pre><code·class="text">#rec{some_field·::·Type}</code></pre><p>Any·unspecified·fields·are·assumed·to·have·the·type·in·the·original·record310 by·adding·type·information·about·the·field·as·follows:</p><pre><code·class="text">#rec{some_field·::·Type}</code></pre><p>Any·unspecified·fields·are·assumed·to·have·the·type·in·the·original·record
311 declaration.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>When·records·are·used·to·create·patterns·for·ETS·and·Mnesia·match·functions,311 declaration.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>When·records·are·used·to·create·patterns·for·ETS·and·Mnesia·match·functions,
312 Dialyzer·may·need·some·help·not·to·emit·bad·warnings.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">height</span><span·class="p"·data-group-id="0004811583-1">(</span><span·class="p"·data-group-id="0004811583-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="0004811583-2">(</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·5a09d98cb4ef55367b44b104c20ead3e8ace8e09c68825a8e879c21541d0821e·...·]-2">)</span><span·class="p">.</span><span·class="w">312 Dialyzer·may·need·some·help·not·to·emit·bad·warnings.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">height</span><span·class="p"·data-group-id="6605577206-1">(</span><span·class="p"·data-group-id="6605577206-1">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="6605577206-2">(</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·96f2cdaceb43be72e26f9e182bb417704288e1cfe39c47eee67047e4fcc33e76·...·]-2">)</span><span·class="p">.</span><span·class="w">
313 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0004811583-3">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0004811583-4">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><sp[·...·truncated·by·diffoscope;·len:·561,·SHA:·dd2303dd9d6390a6f06c3a2720fc31ac9b1ed8fae3f904eb7a197503575e5e71·...·]-3">)</span><span·class="p">.</span><span·class="w">313 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="6605577206-3">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6605577206-4">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><sp[·...·truncated·by·diffoscope;·len:·561,·SHA:·0bc2c01d09e293741b451fffea652596cb5edd43d221356e60829946e4cb3b08·...·]-3">)</span><span·class="p">.</span><span·class="w">
  
314 </span><span·class="nf">lookup</span><span·class="p"·data-group-id="0004811583-7">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p"·data-group-id="0004811583-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">314 </span><span·class="nf">lookup</span><span·class="p"·data-group-id="6605577206-7">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p"·data-group-id="6605577206-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
315 ····</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_object</span><span·class="p"·data-group-id="0004811583-8">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="0004811583-9">{</span><span·class="ss">name</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·347,·SHA:·297c827eee64c9d0620326c9e1100642fb25c4f70cc0a85bc3ee581db41b2858·...·]-8">)</span><span·class="p">.</span></code></pre><p>Dialyzer·will·emit·a·warning·since·<code·class="inline">'_'</code>·is·not·in·the·type·of·record·field315 ····</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_object</span><span·class="p"·data-group-id="6605577206-8">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6605577206-9">{</span><span·class="ss">name</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·347,·SHA:·bd1abe30351435291d2feae83ec60234928f6e23a1d7240a5808dfeed153c8c1·...·]-8">)</span><span·class="p">.</span></code></pre><p>Dialyzer·will·emit·a·warning·since·<code·class="inline">'_'</code>·is·not·in·the·type·of·record·field
316 <code·class="inline">height</code>.</p><p>The·recommended·way·of·dealing·with·this·is·to·declare·the·smallest·record316 <code·class="inline">height</code>.</p><p>The·recommended·way·of·dealing·with·this·is·to·declare·the·smallest·record
317 field·types·to·accommodate·all·your·needs,·and·then·create·refinements·as317 field·types·to·accommodate·all·your·needs,·and·then·create·refinements·as
318 needed.·The·modified·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="9242015680-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9242015680-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><sp[·...·truncated·by·diffoscope;·len:·668,·SHA:·dc6d864a4ef550ad9592196af832bcab19e90bb2f5e4f705c5f966fb498e277d·...·]-1">)</span><span·class="p">.</span><span·class="w">318 needed.·The·modified·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1769423686-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1769423686-2">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><sp[·...·truncated·by·diffoscope;·len:·668,·SHA:·316ee3df12593a8d442acffda8592572e1cb54e5e50c03e2b9708c5282536865·...·]-1">)</span><span·class="p">.</span><span·class="w">
319 </span><span·class="w">319 </span><span·class="w">
320 </span><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">person</span><span·class="p"·data-group-id="9242015680-5">(</span><span·class="p"·data-group-id="9242015680-5">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·325,·SHA:·c02f28cb86b1f5a1495a0736941cbc287e044d73a91a3b1254048f0e3b290b92·...·]-6">}</span><span·class="p">.</span></code></pre><p>In·specifications·and·type·declarations·the·type·<code·class="inline">person()</code>·is·to·be·preferred320 </span><span·class="p">-</span><span·class="na">type</span><span·class="w">·</span><span·class="nf">person</span><span·class="p"·data-group-id="1769423686-5">(</span><span·class="p"·data-group-id="1769423686-5">)</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·325,·SHA:·460ddb87f9ff45829065c7068bbab2671dce85841483ebb7b39aeb1779b58107·...·]-6">}</span><span·class="p">.</span></code></pre><p>In·specifications·and·type·declarations·the·type·<code·class="inline">person()</code>·is·to·be·preferred
321 before·<code·class="inline">#person{}</code>.</p></section><h2·id="specifications-for-functions"·class="section-heading">321 before·<code·class="inline">#person{}</code>.</p></section><h2·id="specifications-for-functions"·class="section-heading">
322 ··<a·href="#specifications-for-functions"·class="hover-link">322 ··<a·href="#specifications-for-functions"·class="hover-link">
323 ····<i·class="ri-link-m"·aria-hidden="true"></i>323 ····<i·class="ri-link-m"·aria-hidden="true"></i>
324 ··</a>324 ··</a>
325 ··<span·class="text">Specifications·for·Functions</span>325 ··<span·class="text">Specifications·for·Functions</span>
326 </h2>326 </h2>
327 <p>A·specification·(or·contract)·for·a·function·is·given·using·the·<code·class="inline">-spec</code>327 <p>A·specification·(or·contract)·for·a·function·is·given·using·the·<code·class="inline">-spec</code>
328 attribute.·The·general·format·is·as·follows:</p><pre><code·class="text">-spec·Function(ArgType1,·...,·ArgTypeN)·-&gt;·ReturnType.</code></pre><p>An·implementation·of·the·function·with·the·same·name·<code·class="inline">Function</code>·must·exist·in328 attribute.·The·general·format·is·as·follows:</p><pre><code·class="text">-spec·Function(ArgType1,·...,·ArgTypeN)·-&gt;·ReturnType.</code></pre><p>An·implementation·of·the·function·with·the·same·name·<code·class="inline">Function</code>·must·exist·in
329 the·current·module,·and·the·arity·of·the·function·must·match·the·number·of329 the·current·module,·and·the·arity·of·the·function·must·match·the·number·of
330 arguments,·otherwise·the·compilation·fails.</p><p>The·following·longer·format·with·module·name·is·also·valid·as·long·as·<code·class="inline">Module</code>330 arguments,·otherwise·the·compilation·fails.</p><p>The·following·longer·format·with·module·name·is·also·valid·as·long·as·<code·class="inline">Module</code>
331 is·the·name·of·the·current·module.·This·can·be·useful·for·documentation331 is·the·name·of·the·current·module.·This·can·be·useful·for·documentation
332 purposes.</p><pre><code·class="text">-spec·Module:Function(ArgType1,·...,·ArgTypeN)·-&gt;·ReturnType.</code></pre><p>Also,·for·documentation·purposes,·argument·names·can·be·given:</p><pre><code·class="text">-spec·Function(ArgName1·::·Type1,·...,·ArgNameN·::·TypeN)·-&gt;·RT.</code></pre><p>A·function·specification·can·be·overloaded.·That·is,·it·can·have·several·types,332 purposes.</p><pre><code·class="text">-spec·Module:Function(ArgType1,·...,·ArgTypeN)·-&gt;·ReturnType.</code></pre><p>Also,·for·documentation·purposes,·argument·names·can·be·given:</p><pre><code·class="text">-spec·Function(ArgName1·::·Type1,·...,·ArgNameN·::·TypeN)·-&gt;·RT.</code></pre><p>A·function·specification·can·be·overloaded.·That·is,·it·can·have·several·types,
333 separated·by·a·semicolon·(<code·class="inline">;</code>).·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="6339393899-1">(</span><span·class="n">T1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T2</span><span·class="p"·data-group-id="6339393899-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">T3</span><span·class="p">;</span><span·class="w"> 
334 ·········</span><span·class="p"·data-group-id="6339393899-2">(</span><span·class="n">T4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T5</span><span·class="p"·data-group-id="6339393899-2">)</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·185,·SHA:·db62f06a41a994a4ffd0d90a808acf546ac537c8c16c44bdba324e44c8428ab3·...·]333 separated·by·a·semicolon·(<code·class="inline">;</code>).·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·314,·SHA:·36aa2927902345e51ec62b6d349fb237b89ab7a916c08f6a243bff428b872a49·...·]
 334 ·········</span><span·class="p"·data-group-id="2763839080-2">(</span><span·class="n">T4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T5</span><span·class="p"·data-group-id="2763839080-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">T6</span><span·class="p">.</span></code></pre><p>A·current·restriction,·which·currently·results·in·a·warning·by·Dialyzer,·is·that
335 the·domains·of·the·argument·types·cannot·overlap.·For·example,·the·following335 the·domains·of·the·argument·types·cannot·overlap.·For·example,·the·following
336 specification·results·in·a·warning:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="9426216987-1">(</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="9426216987-2">(</span><span·class="p"·data-group-id="9426216987-2">)</span><span·class="p"·data-group-id="9426216987-1">)</span><span·class="w">·</span><span·class="p">[·...·truncated·by·diffoscope;·len:·165,·SHA:·65b27716eb2e61e87bc11d4ba02ad2bb368adb6f5801839f0ef05971670748cf·...·]-3">)</span><span·class="p">;</span><span·class="w">336 specification·results·in·a·warning:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="6145742200-1">(</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="6145742200-2">(</span><span·class="p"·data-group-id="6145742200-2">)</span><span·class="p"·data-group-id="6145742200-1">)</span><span·class="w">·</span><span·class="p">[·...·truncated·by·diffoscope;·len:·165,·SHA:·223982fda9616887ce6fa8ce707596af600b9ce50bbe01af0b13338c28a80edc·...·]-3">)</span><span·class="p">;</span><span·class="w">
337 ·········</span><span·class="p"·data-group-id="9426216987-4">(</span><span·class="nf">integer</span><span·class="p"·data-group-id="9426216987-5">(</span><span·class="p"·data-group-id="9426216987-5">)</span><span·class="p"·data-group-id="9426216987-4">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·157,·SHA:·eaeab5b15f24f0c9a0c5ab99b7e85246e343735c12398d43ee419f383b2d306d·...·]-6">)</span><span·class="p">.</span></code></pre><p>Type·variables·can·be·used·in·specifications·to·specify·relations·for·the·input337 ·········</span><span·class="p"·data-group-id="6145742200-4">(</span><span·class="nf">integer</span><span·class="p"·data-group-id="6145742200-5">(</span><span·class="p"·data-group-id="6145742200-5">)</span><span·class="p"·data-group-id="6145742200-4">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·157,·SHA:·0f775c6b1f22ee0c17884972fe23dd78696ee4d41af7cbd9c306f6d1bddaeeef·...·]-6">)</span><span·class="p">.</span></code></pre><p>Type·variables·can·be·used·in·specifications·to·specify·relations·for·the·input
338 and·output·arguments·of·a·function.·For·example,·the·following·specification338 and·output·arguments·of·a·function.·For·example,·the·following·specification
339 defines·the·type·of·a·polymorphic·identity·function:</p><pre><code·class="text">-spec·id(X)·-&gt;·X.</code></pre><p>Notice·that·the·above·specification·does·not·restrict·the·input·and·output·type339 defines·the·type·of·a·polymorphic·identity·function:</p><pre><code·class="text">-spec·id(X)·-&gt;·X.</code></pre><p>Notice·that·the·above·specification·does·not·restrict·the·input·and·output·type
340 in·any·way.·These·types·can·be·constrained·by·guard-like·subtype·constraints·and340 in·any·way.·These·types·can·be·constrained·by·guard-like·subtype·constraints·and
341 provide·bounded·quantification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">id</span><span·class="p"·data-group-id="0394656900-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="0394656900-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="k">when</span><span·[·...·truncated·by·diffoscope;·len:·261,·SHA:·dac7dc7ca084140381f79c7c7f71dfabf6cab4dc1f18403793f54812606f9e22·...·]-2">)</span><span·class="p">.</span></code></pre><p>Currently,·the·<code·class="inline">::</code>·constraint·(read·as·&quot;is·a·subtype·of&quot;)·is·the·only·guard341 provide·bounded·quantification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">id</span><span·class="p"·data-group-id="3039356612-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="3039356612-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="k">when</span><span·[·...·truncated·by·diffoscope;·len:·261,·SHA:·d8c72ccb21d7714e812a1388fa8d56f1a21b6169948ee48346a6c123cbd45a32·...·]-2">)</span><span·class="p">.</span></code></pre><p>Currently,·the·<code·class="inline">::</code>·constraint·(read·as·&quot;is·a·subtype·of&quot;)·is·the·only·guard
342 constraint·that·can·be·used·in·the·<code·class="inline">when</code>·part·of·a·<code·class="inline">-spec</code>·attribute.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·above·function·specification·uses·multiple·occurrences·of·the·same·type342 constraint·that·can·be·used·in·the·<code·class="inline">when</code>·part·of·a·<code·class="inline">-spec</code>·attribute.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·above·function·specification·uses·multiple·occurrences·of·the·same·type
343 variable.·That·provides·more·type·information·than·the·following·function343 variable.·That·provides·more·type·information·than·the·following·function
344 specification,·where·the·type·variables·are·missing:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">id</span><span·class="p"·data-group-id="3989112665-1">(</span><span·class="nf">tuple</span><span·class="p"·data-group-id="3989112665-2">(</span><span·class="p"·data-group-id="3989112665-2">)</span><span·class="p"·data-group-id="3989112665-1">)</span><span·class="w">·</span><span·class="p">-&gt;<[·...·truncated·by·diffoscope;·len:·153,·SHA:·21ae22b15227c08183999761438465dd3af4b225545d63ebbf861eea4b354f99·...·]-3">)</span><span·class="p">.</span></code></pre><p>The·latter·specification·says·that·the·function·takes·some·tuple·and·returns344 specification,·where·the·type·variables·are·missing:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">id</span><span·class="p"·data-group-id="6906319210-1">(</span><span·class="nf">tuple</span><span·class="p"·data-group-id="6906319210-2">(</span><span·class="p"·data-group-id="6906319210-2">)</span><span·class="p"·data-group-id="6906319210-1">)</span><span·class="w">·</span><span·class="p">-&gt;<[·...·truncated·by·diffoscope;·len:·153,·SHA:·6a75a9b5b2ae4dcf44a1b7b0ca79645d126c59bebcd25a16ac0fa0857ca028ad·...·]-3">)</span><span·class="p">.</span></code></pre><p>The·latter·specification·says·that·the·function·takes·some·tuple·and·returns
345 some·tuple.·The·specification·with·the·<code·class="inline">X</code>·type·variable·specifies·that·the345 some·tuple.·The·specification·with·the·<code·class="inline">X</code>·type·variable·specifies·that·the
346 function·takes·a·tuple·and·returns·<em>the·same</em>·tuple.</p><p>However,·it·is·up·to·the·tools·that·process·the·specifications·to·choose346 function·takes·a·tuple·and·returns·<em>the·same</em>·tuple.</p><p>However,·it·is·up·to·the·tools·that·process·the·specifications·to·choose
347 whether·to·take·this·extra·information·into·account·or·not.</p></section><p>The·scope·of·a·<code·class="inline">::</code>·constraint·is·the·<code·class="inline">(...)·-&gt;·RetType</code>·specification·after347 whether·to·take·this·extra·information·into·account·or·not.</p></section><p>The·scope·of·a·<code·class="inline">::</code>·constraint·is·the·<code·class="inline">(...)·-&gt;·RetType</code>·specification·after
348 which·it·appears.·To·avoid·confusion,·it·is·suggested·that·different·variables348 which·it·appears.·To·avoid·confusion,·it·is·suggested·that·different·variables
349 are·used·in·different·constituents·of·an·overloaded·contract,·as·shown·in·the349 are·used·in·different·constituents·of·an·overloaded·contract,·as·shown·in·the
350 following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="2127694007-1">(</span><span·class="p"·data-group-id="2127694007-2">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="2127694007-3">(</span><span·class="p"·data-group-id="2127694007-3">)</span><span·class="p"·data-group-id="2127694007-2">}</span><span·class="p"·data-group-id="2127694007-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="2127694007-4">(</span><span·class="p"·data-group-id="2127694007-4">)</span><span·class="p">;</span><span·class="w"> 
351 ·········</span><span·class="p"·data-group-id="2127694007-5">(</span><span·class="p"·data-group-id="2127694007-6">[</span><span·class="n">Y</span><span·class="p"·data-group-id="2127694007-6">]</span><span·class="p"·data-group-id="2127694007-5">)</span><spa[·...·truncated·by·diffoscope;·len:·543,·SHA:·048e641bf0d2680131376e46427c6b31c43b09d54c44e72da5a47c98f158570b·...·]350 following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="1710190045-1">(</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·807,·SHA:·2ece54b3e741c3ced3f59cd08274cd185b4c742f9a5d77ab8171e6cc37fc219f·...·]
 351 ·········</span><span·class="p"·data-group-id="1710190045-5">(</span><span·class="p"·data-group-id="1710190045-6">[</span><span·class="n">Y</span><span·class="p"·data-group-id="1710190045-6">]</span><span·class="p"·data-group-id="1710190045-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">number</span><span·class="p"·data-group-id="1710190045-7">(</span><span·class="p"·data-group-id="1710190045-7">)</span><span·class="p">.</span></code></pre><p>Some·functions·in·Erlang·are·not·meant·to·return;·either·because·they·define
352 servers·or·because·they·are·used·to·throw·exceptions,·as·in·the·following352 servers·or·because·they·are·used·to·throw·exceptions,·as·in·the·following
353 function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_error</span><span·class="p"·data-group-id="6014772492-1">(</span><span·class="n">Err</span><span·class="p"·data-group-id="6014772492-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">throw</span><span·class="p"·data-group-id="6014772492-2">(</spa[·...·truncated·by·diffoscope;·len:·252,·SHA:·b0c5c8111730473dbb510b202e53ba6c7efcebd4ebe8a5379e053c3d88c32275·...·]-2">)</span><span·class="p">.</span></code></pre><p>For·such·functions,·it·is·recommended·to·use·the·special·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:no_return/0"><code·class="inline">no_return/0</code></a>·type353 function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_error</span><span·class="p"·data-group-id="6846974056-1">(</span><span·class="n">Err</span><span·class="p"·data-group-id="6846974056-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">throw</span><span·class="p"·data-group-id="6846974056-2">(</spa[·...·truncated·by·diffoscope;·len:·252,·SHA:·b0c10bac57b0dbf9f3738799afa985639ef58cf8737a98f52bba8be14d19ed84·...·]-2">)</span><span·class="p">.</span></code></pre><p>For·such·functions,·it·is·recommended·to·use·the·special·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:no_return/0"><code·class="inline">no_return/0</code></a>·type
354 for·their·&quot;return&quot;,·through·a·contract·of·the·following·form:</p><pre><code·class="text">-spec·my_error(term())·-&gt;·no_return().</code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Erlang·uses·the·shorthand·version·<code·class="inline">_</code>·as·an·anonymous·type·variable·equivalent354 for·their·&quot;return&quot;,·through·a·contract·of·the·following·form:</p><pre><code·class="text">-spec·my_error(term())·-&gt;·no_return().</code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Erlang·uses·the·shorthand·version·<code·class="inline">_</code>·as·an·anonymous·type·variable·equivalent
355 to·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:term/0"><code·class="inline">term/0</code></a>·or·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:any/0"><code·class="inline">any/0</code></a>.·For·example,·the·following·function</p><pre><code·class="text">-spec·Function(string(),·_)·-&gt;·string().</code></pre><p>is·equivalent·to:</p><pre><code·class="text">-spec·Function(string(),·any())·-&gt;·string().</code></pre></section>355 to·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:term/0"><code·class="inline">term/0</code></a>·or·<a·href="../../erts-15.2.6/doc/html/erlang.html#t:any/0"><code·class="inline">any/0</code></a>.·For·example,·the·following·function</p><pre><code·class="text">-spec·Function(string(),·_)·-&gt;·string().</code></pre><p>is·equivalent·to:</p><pre><code·class="text">-spec·Function(string(),·any())·-&gt;·string().</code></pre></section>
356 </div>356 </div>
  
357 <div·class="bottom-actions"·id="bottom-actions">357 <div·class="bottom-actions"·id="bottom-actions">
358 ··<div·class="bottom-actions-item">358 ··<div·class="bottom-actions-item">
  
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215 ······<p·class="built-using">215 ······<p·class="built-using">
216 ········Built·using216 ········Built·using
217 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the217 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
218 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>218 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
219 ······</p>219 ······</p>
220 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>220 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
221 ····</footer>221 ····</footer>
222 ··</div>222 ··</div>
223 </main>223 </main>
224 </div>224 </div>
225 <script>225 <script>
226 ··function·mermaidLoaded()·{226 ··function·mermaidLoaded()·{
227 ····mermaid.initialize({227 ····mermaid.initialize({
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332 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>332 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
333 ······</p>333 ······</p>
334 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>334 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
335 ····</footer>335 ····</footer>
336 ··</div>336 ··</div>
337 </main>337 </main>
338 </div>338 </div>
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340 ··function·mermaidLoaded()·{340 ··function·mermaidLoaded()·{
341 ····mermaid.initialize({341 ····mermaid.initialize({
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149 occurrences·of·<code·class="inline">maybe</code>·without·quotes.</p><p><a·href=""·id="float_matching"></a></p><h3·id="0-0-and-0-0-will-no-longer-be-exactly-equal"·class="section-heading">149 occurrences·of·<code·class="inline">maybe</code>·without·quotes.</p><p><a·href=""·id="float_matching"></a></p><h3·id="0-0-and-0-0-will-no-longer-be-exactly-equal"·class="section-heading">
150 ··<a·href="#0-0-and-0-0-will-no-longer-be-exactly-equal"·class="hover-link">150 ··<a·href="#0-0-and-0-0-will-no-longer-be-exactly-equal"·class="hover-link">
151 ····<i·class="ri-link-m"·aria-hidden="true"></i>151 ····<i·class="ri-link-m"·aria-hidden="true"></i>
152 ··</a>152 ··</a>
153 ··<span·class="text">0.0·and·-0.0·will·no·longer·be·exactly·equal</span>153 ··<span·class="text">0.0·and·-0.0·will·no·longer·be·exactly·equal</span>
154 </h3>154 </h3>
155 <p>Currently,·the·floating·point·numbers·<code·class="inline">0.0</code>·and·<code·class="inline">-0.0</code>·have·distinct·internal155 <p>Currently,·the·floating·point·numbers·<code·class="inline">0.0</code>·and·<code·class="inline">-0.0</code>·have·distinct·internal
156 representations.·That·can·be·seen·if·they·are·converted·to·binaries:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="2569507386-1">&lt;&lt;</span><span·class="mf">0.0</span><span·class="o">/</span><span·class="nb">float</span><span·class="p"·data-group-id="2569507386-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">156 representations.·That·can·be·seen·if·they·are·converted·to·binaries:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="0693865008-1">&lt;&lt;</span><span·class="mf">0.0</span><span·class="o">/</span><span·class="nb">float</span><span·class="p"·data-group-id="0693865008-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">
157 </span><span·class="p"·data-group-id="2569507386-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·182,·SHA:·936932311eb2f8374d2680271942dc2ccad8a9aca8ddbdd914794d6b73a8eb4c·...·]-2">&gt;&gt;</span><span·class="gp·unselectable">157 </span><span·class="p"·data-group-id="0693865008-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·182,·SHA:·b29668d4d233ff3efb5e81b69de78ef3b71d3609ae7e3d816de8d8dcd50858e7·...·]-2">&gt;&gt;</span><span·class="gp·unselectable">
158 2&gt;·</span><span·class="p"·data-group-id="2569507386-3">&lt;&lt;</span><span·class="o">-</span><span·class="mf">0.0</span><span·class="o">/</span><span·class="nb">float</span><span·class="p"·data-group-id="2569507386-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">158 2&gt;·</span><span·class="p"·data-group-id="0693865008-3">&lt;&lt;</span><span·class="o">-</span><span·class="mf">0.0</span><span·class="o">/</span><span·class="nb">float</span><span·class="p"·data-group-id="0693865008-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">
159 </span><span·class="p"·data-group-id="2569507386-4">&lt;&lt;</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><spa[·...·truncated·by·diffoscope;·len:·184,·SHA:·67a9ac086bc34494320f96ffa238edc07410c4f6ecd578754aaadb4483c55924·...·]-4">&gt;&gt;</span></code></pre><p>However,·when·they·are·matched·against·each·other·or·compared·using·the·<code·class="inline">=:=</code>159 </span><span·class="p"·data-group-id="0693865008-4">&lt;&lt;</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><spa[·...·truncated·by·diffoscope;·len:·184,·SHA:·2951e320a8a94635bb62407a9bddd0f099b7737bac1cc426aa80618d03832372·...·]-4">&gt;&gt;</span></code></pre><p>However,·when·they·are·matched·against·each·other·or·compared·using·the·<code·class="inline">=:=</code>
160 operator,·they·are·considered·to·be·equal.·Thus,·<code·class="inline">0.0·=:=·-0.0</code>·currently160 operator,·they·are·considered·to·be·equal.·Thus,·<code·class="inline">0.0·=:=·-0.0</code>·currently
161 returns·<code·class="inline">true</code>.</p><p>In·Erlang/OTP·27,·<code·class="inline">0.0·=:=·-0.0</code>·will·return·<code·class="inline">false</code>,·and·matching·<code·class="inline">0.0</code>·against161 returns·<code·class="inline">true</code>.</p><p>In·Erlang/OTP·27,·<code·class="inline">0.0·=:=·-0.0</code>·will·return·<code·class="inline">false</code>,·and·matching·<code·class="inline">0.0</code>·against
162 <code·class="inline">-0.0</code>·will·fail.·When·used·as·map·keys,·<code·class="inline">0.0</code>·and·<code·class="inline">-0.0</code>·will·be·considered·to162 <code·class="inline">-0.0</code>·will·fail.·When·used·as·map·keys,·<code·class="inline">0.0</code>·and·<code·class="inline">-0.0</code>·will·be·considered·to
163 be·distinct.</p><p>The·<code·class="inline">==</code>·operator·will·continue·to·return·<code·class="inline">true</code>·for·<code·class="inline">0.0·==·-0.0</code>.</p><p>To·help·to·find·code·that·might·need·to·be·revised,·in·OTP·27·there·will·be·a163 be·distinct.</p><p>The·<code·class="inline">==</code>·operator·will·continue·to·return·<code·class="inline">true</code>·for·<code·class="inline">0.0·==·-0.0</code>.</p><p>To·help·to·find·code·that·might·need·to·be·revised,·in·OTP·27·there·will·be·a
164 new·compiler·warning·when·matching·against·<code·class="inline">0.0</code>·or·comparing·to·that·value164 new·compiler·warning·when·matching·against·<code·class="inline">0.0</code>·or·comparing·to·that·value
165 using·the·<code·class="inline">=:=</code>·operator.·The·warning·can·be·suppressed·by·matching·against165 using·the·<code·class="inline">=:=</code>·operator.·The·warning·can·be·suppressed·by·matching·against
166 <code·class="inline">+0.0</code>·instead·of·<code·class="inline">0.0</code>.</p><p>We·plan·to·introduce·the·same·warning·in·OTP·26.1,·but·by·default·it·will·be166 <code·class="inline">+0.0</code>·instead·of·<code·class="inline">0.0</code>.</p><p>We·plan·to·introduce·the·same·warning·in·OTP·26.1,·but·by·default·it·will·be
167 disabled.</p><p><a·href=""·id="singleton_typevars"></a></p><h3·id="singleton-type-variables-will-become-a-compile-time-error"·class="section-heading">167 disabled.</p><p><a·href=""·id="singleton_typevars"></a></p><h3·id="singleton-type-variables-will-become-a-compile-time-error"·class="section-heading">
168 ··<a·href="#singleton-type-variables-will-become-a-compile-time-error"·class="hover-link">168 ··<a·href="#singleton-type-variables-will-become-a-compile-time-error"·class="hover-link">
169 ····<i·class="ri-link-m"·aria-hidden="true"></i>169 ····<i·class="ri-link-m"·aria-hidden="true"></i>
170 ··</a>170 ··</a>
171 ··<span·class="text">Singleton·type·variables·will·become·a·compile-time·error</span>171 ··<span·class="text">Singleton·type·variables·will·become·a·compile-time·error</span>
172 </h3>172 </h3>
173 <p>Before·Erlang/OTP·26,·the·compiler·would·silenty·accept·the·following·spec:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">f</span><span·class="p"·data-group-id="2139301913-1">(</span><span·class="n">Opts</span><span·class="p"·data-group-id="2139301913-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="2139301913-2">(</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·702707680920c8a9bd39fc5279d669f0f0b7acf27d6616ec411b6f799a9096f5·...·]-2">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">173 <p>Before·Erlang/OTP·26,·the·compiler·would·silenty·accept·the·following·spec:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">f</span><span·class="p"·data-group-id="1961533421-1">(</span><span·class="n">Opts</span><span·class="p"·data-group-id="1961533421-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="1961533421-2">(</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·93c5ffa51824271722d10afd27f1778d0f357fb9daf88494cee2546867e7c3c5·...·]-2">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">
174 ····</span><span·class="n">Opts</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="2139301913-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Unknown</span><span·class="p"·data-group-id="2139301913-3">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·196,·SHA:·2ad6fccb0a6abe9d4549589799acd05bc43d7c2e4dcca571988e1b3ac4d18286·...·]-4">}</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="n">Opts</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1961533421-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Unknown</span><span·class="p"·data-group-id="1961533421-3">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·196,·SHA:·0903a1f7d7094323426fe720e83c8ecbba8d98701acc44ff65683820319408aa·...·]-4">}</span><span·class="p">.</span><span·class="w">
175 </span><span·class="nf">f</span><span·class="p"·data-group-id="2139301913-5">(</span><span·class="p">_</span><span·class="p"·data-group-id="2139301913-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p>In·OTP·26,·the·compiler·emits·a·warning·pointing·out·that·the·type·variable175 </span><span·class="nf">f</span><span·class="p"·data-group-id="1961533421-5">(</span><span·class="p">_</span><span·class="p"·data-group-id="1961533421-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p>In·OTP·26,·the·compiler·emits·a·warning·pointing·out·that·the·type·variable
176 <code·class="inline">Unknown</code>·is·unbound:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">t</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">6</span><span·class="p">:</span><span·class="mi">18</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><span·class="ss">variable</span><span·class="w">·</span><span·class="ss">&#39;Unknown&#39;</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">only</span><span·class="w">·</span><span·class="ss">used</span><span·class="w">·</span><span·class="nf">once</span><span·class="w">·</span><span·class="p"·data-group-id="8404458643-1">(</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">unbound</span><span·class="p"·data-group-id="8404458643-1">)</span><span·class="w">176 <code·class="inline">Unknown</code>·is·unbound:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">t</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">6</span><span·class="p">:</span><span·class="mi">18</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><span·class="ss">variable</span><span·class="w">·</span><span·class="ss">&#39;Unknown&#39;</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">only</span><span·class="w">·</span><span·class="ss">used</span><span·class="w">·</span><span·class="nf">once</span><span·class="w">·</span><span·class="p"·data-group-id="6409773161-1">(</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">unbound</span><span·class="p"·data-group-id="6409773161-1">)</span><span·class="w">
177 </span><span·class="c1">%····6|·····Opts·::·{ok,·Unknown}·|·{error,·Unknown}.</span><span·class="w">177 </span><span·class="c1">%····6|·····Opts·::·{ok,·Unknown}·|·{error,·Unknown}.</span><span·class="w">
178 </span><span·class="c1">%·····|··················^</span></code></pre><p>In·OTP·27,·that·warning·will·become·an·error.</p><p><a·href=""·id="escripts_will_be_compiled"></a></p><h3·id="escripts-will-be-compiled-by-default"·class="section-heading">178 </span><span·class="c1">%·····|··················^</span></code></pre><p>In·OTP·27,·that·warning·will·become·an·error.</p><p><a·href=""·id="escripts_will_be_compiled"></a></p><h3·id="escripts-will-be-compiled-by-default"·class="section-heading">
179 ··<a·href="#escripts-will-be-compiled-by-default"·class="hover-link">179 ··<a·href="#escripts-will-be-compiled-by-default"·class="hover-link">
180 ····<i·class="ri-link-m"·aria-hidden="true"></i>180 ····<i·class="ri-link-m"·aria-hidden="true"></i>
181 ··</a>181 ··</a>
182 ··<span·class="text">Escripts·will·be·compiled·by·default</span>182 ··<span·class="text">Escripts·will·be·compiled·by·default</span>
183 </h3>183 </h3>
184 <p>Escripts·will·be·compiled·by·default·instead·of·interpreted.·That·means·that·the184 <p>Escripts·will·be·compiled·by·default·instead·of·interpreted.·That·means·that·the
185 <code·class="inline">compiler</code>·application·must·be·available.</p><p>The·old·behavior·of·interpreting·escripts·can·be·restored·by·adding·the185 <code·class="inline">compiler</code>·application·must·be·available.</p><p>The·old·behavior·of·interpreting·escripts·can·be·restored·by·adding·the
186 following·line·to·the·script·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">mode</span><span·class="p"·data-group-id="1873949146-1">(</span><span·class="ss">interpret</span><span·class="p"·data-group-id="1873949146-1">)</span><span·class="p">.</span></code></pre><p>In·OTP·28,·support·for·interpreting·an·escript·will·be·removed.</p><h3·id="code_path_choice-will-default-to-strict"·class="section-heading">186 following·line·to·the·script·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">mode</span><span·class="p"·data-group-id="9551506610-1">(</span><span·class="ss">interpret</span><span·class="p"·data-group-id="9551506610-1">)</span><span·class="p">.</span></code></pre><p>In·OTP·28,·support·for·interpreting·an·escript·will·be·removed.</p><h3·id="code_path_choice-will-default-to-strict"·class="section-heading">
187 ··<a·href="#code_path_choice-will-default-to-strict"·class="hover-link">187 ··<a·href="#code_path_choice-will-default-to-strict"·class="hover-link">
188 ····<i·class="ri-link-m"·aria-hidden="true"></i>188 ····<i·class="ri-link-m"·aria-hidden="true"></i>
189 ··</a>189 ··</a>
190 ··<span·class="text">-code_path_choice·will·default·to·strict</span>190 ··<span·class="text">-code_path_choice·will·default·to·strict</span>
191 </h3>191 </h3>
192 <p>This·command·line·option·controls·if·paths·given·in·the·command·line,·boot192 <p>This·command·line·option·controls·if·paths·given·in·the·command·line,·boot
193 scripts,·and·the·code·server·should·be·interpreted·as·is·strict·or·relaxed.</p><p>OTP·26·and·earlier·defaults·to·<code·class="inline">relaxed</code>,·which·means·<code·class="inline">-pa·myapp/ebin</code>·would193 scripts,·and·the·code·server·should·be·interpreted·as·is·strict·or·relaxed.</p><p>OTP·26·and·earlier·defaults·to·<code·class="inline">relaxed</code>,·which·means·<code·class="inline">-pa·myapp/ebin</code>·would
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231 &quot;231 &quot;
232 String·Content232 String·Content
233 &quot;233 &quot;
234 %%234 %%
235 %%·In·OTP·27·it·is·instead·interpreted·as·a235 %%·In·OTP·27·it·is·instead·interpreted·as·a
236 %%·Triple-Quoted·String·equivalent·to236 %%·Triple-Quoted·String·equivalent·to
237 &quot;String·Content&quot;</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="s">&quot;&quot;</span><span·class="s">&quot;&quot;</span><span·class="w">237 &quot;String·Content&quot;</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="s">&quot;&quot;</span><span·class="s">&quot;&quot;</span><span·class="w">
238 </span><span·class="o">++</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="0231846130-1">(</span><span·class="p"·data-group-id="0231846130-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">238 </span><span·class="o">++</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="6899691717-1">(</span><span·class="p"·data-group-id="6899691717-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">
239 </span><span·class="s">&quot;&quot;</span><span·class="s">&quot;&quot;</span><span·class="w">239 </span><span·class="s">&quot;&quot;</span><span·class="s">&quot;&quot;</span><span·class="w">
240 </span><span·class="c1">%%·Became</span><span·class="w">240 </span><span·class="c1">%%·Became</span><span·class="w">
241 </span><span·class="s">&quot;&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="0231846130-2">(</span><span·class="p"·data-group-id="0231846130-2">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="w">241 </span><span·class="s">&quot;&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="6899691717-2">(</span><span·class="p"·data-group-id="6899691717-2">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="w">
242 </span><span·class="c1">%%</span><span·class="w">242 </span><span·class="c1">%%</span><span·class="w">
243 </span><span·class="c1">%%·In·OTP·27·it·is·instead·interpreted·as·a</span><span·class="w">243 </span><span·class="c1">%%·In·OTP·27·it·is·instead·interpreted·as·a</span><span·class="w">
244 </span><span·class="c1">%%·Triple-Quoted·String·(triple-or-more)·equivalent·to</span><span·class="w">244 </span><span·class="c1">%%·Triple-Quoted·String·(triple-or-more)·equivalent·to</span><span·class="w">
245 </span><span·class="s">&quot;++·foo()·++&quot;</span></code></pre><p>From·Erlang/OTP·26.1·up·to·27.0·the·compiler·issues·a·warning·for·a·sequence·of245 </span><span·class="s">&quot;++·foo()·++&quot;</span></code></pre><p>From·Erlang/OTP·26.1·up·to·27.0·the·compiler·issues·a·warning·for·a·sequence·of
246 3·or·more·double-quote·characters·since·that·is·almost·certainly·a·mistake·or246 3·or·more·double-quote·characters·since·that·is·almost·certainly·a·mistake·or
247 something·like·a·result·of·bad·automatic·code·generation.·If·a·users·gets·that247 something·like·a·result·of·bad·automatic·code·generation.·If·a·users·gets·that
248 warning,·the·code·should·be·corrected·for·example·by·inserting·appropriate248 warning,·the·code·should·be·corrected·for·example·by·inserting·appropriate
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358 ······<p·class="built-using">358 ······<p·class="built-using">
359 ········Built·using359 ········Built·using
360 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the360 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
361 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>361 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
362 ······</p>362 ······</p>
363 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>363 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
364 ····</footer>364 ····</footer>
365 ··</div>365 ··</div>
366 </main>366 </main>
367 </div>367 </div>
368 <script>368 <script>
369 ··function·mermaidLoaded()·{369 ··function·mermaidLoaded()·{
370 ····mermaid.initialize({370 ····mermaid.initialize({
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140 ········Built·using140 ········Built·using
141 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the141 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
142 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>142 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
143 ······</p>143 ······</p>
144 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>144 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
145 ····</footer>145 ····</footer>
146 ··</div>146 ··</div>
147 </main>147 </main>
148 </div>148 </div>
149 <script>149 <script>
150 ··function·mermaidLoaded()·{150 ··function·mermaidLoaded()·{
151 ····mermaid.initialize({151 ····mermaid.initialize({
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513 ········Built·using513 ········Built·using
514 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the514 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
515 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>515 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
516 ······</p>516 ······</p>
517 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>517 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
518 ····</footer>518 ····</footer>
519 ··</div>519 ··</div>
520 </main>520 </main>
521 </div>521 </div>
522 <script>522 <script>
523 ··function·mermaidLoaded()·{523 ··function·mermaidLoaded()·{
524 ····mermaid.initialize({524 ····mermaid.initialize({
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203 ········Built·using203 ········Built·using
204 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the204 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
205 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>205 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
206 ······</p>206 ······</p>
207 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>207 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
208 ····</footer>208 ····</footer>
209 ··</div>209 ··</div>
210 </main>210 </main>
211 </div>211 </div>
212 <script>212 <script>
213 ··function·mermaidLoaded()·{213 ··function·mermaidLoaded()·{
214 ····mermaid.initialize({214 ····mermaid.initialize({
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237 <code·class="inline">uds_dist</code>·example·using·a·port·driver·written·in·C,·<code·class="inline">erl_uds_dist</code>·is·written237 <code·class="inline">uds_dist</code>·example·using·a·port·driver·written·in·C,·<code·class="inline">erl_uds_dist</code>·is·written
238 entirely·in·Erlang.</p><h3·id="exported-callback-functions"·class="section-heading">238 entirely·in·Erlang.</p><h3·id="exported-callback-functions"·class="section-heading">
239 ··<a·href="#exported-callback-functions"·class="hover-link">239 ··<a·href="#exported-callback-functions"·class="hover-link">
240 ····<i·class="ri-link-m"·aria-hidden="true"></i>240 ····<i·class="ri-link-m"·aria-hidden="true"></i>
241 ··</a>241 ··</a>
242 ··<span·class="text">Exported·Callback·Functions</span>242 ··<span·class="text">Exported·Callback·Functions</span>
243 </h3>243 </h3>
244 <p>The·following·functions·are·mandatory:</p><ul><li><pre·id="listen"><code·class="makeup·erlang"·translate="no"><span·class="nf">listen</span><span·class="p"·data-group-id="7413265898-1">(</span><span·class="n">Name</span><span·class="p"·data-group-id="7413265898-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">244 <p>The·following·functions·are·mandatory:</p><ul><li><pre·id="listen"><code·class="makeup·erlang"·translate="no"><span·class="nf">listen</span><span·class="p"·data-group-id="5560077280-1">(</span><span·class="n">Name</span><span·class="p"·data-group-id="5560077280-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
245 </span><span·class="err"> </span><span·class="err"> </span><span·class="p"·data-group-id="7413265898-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7413265898-3">{</span><span·class="n">Listen</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Address</span>[·...·truncated·by·diffoscope;·len:·456,·SHA:·ddf81d43854096631077ae241da76ad67e73ca8f667e490f96046a1a3cb99217·...·]-4">}</span><span·class="w">245 </span><span·class="err"> </span><span·class="err"> </span><span·class="p"·data-group-id="5560077280-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5560077280-3">{</span><span·class="n">Listen</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Address</span>[·...·truncated·by·diffoscope;·len:·456,·SHA:·033e680fbce5182480d88f8482310da9d5f660411c5a950598109f22b42dd15c·...·]-4">}</span><span·class="w">
246 </span><span·class="nf">listen</span><span·class="p"·data-group-id="7413265898-5">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="n">Host</span><span·class="p"·data-group-id="7413265898-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">246 </span><span·class="nf">listen</span><span·class="p"·data-group-id="5560077280-5">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="n">Host</span><span·class="p"·data-group-id="5560077280-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
247 </span><span·class="err"> </span><span·class="err"> </span><span·class="p"·data-group-id="7413265898-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7413265898-7">{</span><span·class="n">Listen</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Address</span>[·...·truncated·by·diffoscope;·len:·456,·SHA:·65d509558405effdbde474f62e7c1387635c40fe2a6f9d43998483ad5036bde3·...·]-8">}</span></code></pre><p><code·class="inline">listen/2</code>·is·called·once·in·order·to·listen·for·incoming·connection·requests.247 </span><span·class="err"> </span><span·class="err"> </span><span·class="p"·data-group-id="5560077280-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5560077280-7">{</span><span·class="n">Listen</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Address</span>[·...·truncated·by·diffoscope;·len:·456,·SHA:·3c62420d3851d39cab645374f3966412938644baa4cb76cbdd59b60bc61b5a21·...·]-8">}</span></code></pre><p><code·class="inline">listen/2</code>·is·called·once·in·order·to·listen·for·incoming·connection·requests.
248 The·call·is·made·when·the·distribution·is·brought·up.·The·argument·<code·class="inline">Name</code>·is248 The·call·is·made·when·the·distribution·is·brought·up.·The·argument·<code·class="inline">Name</code>·is
249 the·part·of·the·node·name·before·the·<code·class="inline">@</code>·sign·in·the·full·node·name.·It·can·be249 the·part·of·the·node·name·before·the·<code·class="inline">@</code>·sign·in·the·full·node·name.·It·can·be
250 either·an·atom·or·a·string.·The·argument·<code·class="inline">Host</code>·is·the·part·of·the·node·name250 either·an·atom·or·a·string.·The·argument·<code·class="inline">Host</code>·is·the·part·of·the·node·name
251 after·the·<code·class="inline">@</code>·sign·in·the·full·node·name.·It·is·always·a·string.</p><p>The·return·value·consists·of·a·<code·class="inline">Listen</code>·handle·(which·is·later·passed·to·the251 after·the·<code·class="inline">@</code>·sign·in·the·full·node·name.·It·is·always·a·string.</p><p>The·return·value·consists·of·a·<code·class="inline">Listen</code>·handle·(which·is·later·passed·to·the
252 <a·href="alt_dist.html#accept"><code·class="inline">accept/1</code></a>·callback),·<code·class="inline">Address</code>·which·is·a252 <a·href="alt_dist.html#accept"><code·class="inline">accept/1</code></a>·callback),·<code·class="inline">Address</code>·which·is·a
253 <code·class="inline">#net_address{}</code>·record·with·information·about·the·address·for·the·node·(the253 <code·class="inline">#net_address{}</code>·record·with·information·about·the·address·for·the·node·(the
254 <code·class="inline">#net_address{}</code>·record·is·defined·in·<code·class="inline">kernel/include/net_address.hrl</code>),·and254 <code·class="inline">#net_address{}</code>·record·is·defined·in·<code·class="inline">kernel/include/net_address.hrl</code>),·and
255 <code·class="inline">Creation</code>·which·(currently)·is·an·integer·<code·class="inline">1</code>,·<code·class="inline">2</code>,·or·<code·class="inline">3</code>.</p><p>If·<a·href="epmd_cmd.html"><code·class="inline">epmd</code></a>·is·to·be·used·for·node·discovery,·you·typically·want255 <code·class="inline">Creation</code>·which·(currently)·is·an·integer·<code·class="inline">1</code>,·<code·class="inline">2</code>,·or·<code·class="inline">3</code>.</p><p>If·<a·href="epmd_cmd.html"><code·class="inline">epmd</code></a>·is·to·be·used·for·node·discovery,·you·typically·want
256 to·use·the·<code·class="inline">erl_epmd</code>·module·(part·of·the·<code·class="inline">kernel</code>·application)·in·order·to256 to·use·the·<code·class="inline">erl_epmd</code>·module·(part·of·the·<code·class="inline">kernel</code>·application)·in·order·to
257 register·the·listen·port·with·<code·class="inline">epmd</code>·and·retrieve·<code·class="inline">Creation</code>·to·use.</p></li><li><pre·id="address"><code·class="makeup·erlang"·translate="no"><span·class="nf">address</span><span·class="p"·data-group-id="1424259393-1">(</span><span·class="p"·data-group-id="1424259393-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">257 register·the·listen·port·with·<code·class="inline">epmd</code>·and·retrieve·<code·class="inline">Creation</code>·to·use.</p></li><li><pre·id="address"><code·class="makeup·erlang"·translate="no"><span·class="nf">address</span><span·class="p"·data-group-id="1953343814-1">(</span><span·class="p"·data-group-id="1953343814-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
258 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">Address</span></code></pre><p><code·class="inline">address/0</code>·is·called·in·order·to·get·the·<code·class="inline">Address</code>·part·of·the258 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">Address</span></code></pre><p><code·class="inline">address/0</code>·is·called·in·order·to·get·the·<code·class="inline">Address</code>·part·of·the
259 <a·href="alt_dist.html#listen"><code·class="inline">listen/2</code></a>·function·without·creating·a·listen·socket.259 <a·href="alt_dist.html#listen"><code·class="inline">listen/2</code></a>·function·without·creating·a·listen·socket.
260 All·fields·except·<code·class="inline">address</code>·have·to·be·set·in·the·returned·record</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">address</span><span·class="p"·data-group-id="1359639353-1">(</span><span·class="p"·data-group-id="1359639353-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">260 All·fields·except·<code·class="inline">address</code>·have·to·be·set·in·the·returned·record</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">address</span><span·class="p"·data-group-id="3442430967-1">(</span><span·class="p"·data-group-id="3442430967-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
261 ····</span><span·class="p"·data-group-id="1359639353-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Host</span><span·class="p"·data-group-id="1359639353-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·173,·SHA:·6d682872f272e605d322dc81054aadda2f69e073426dd2e8106a4106fc0e5fc8·...·]-3">)</span><span·class="p">,</span><span·class="w">261 ····</span><span·class="p"·data-group-id="3442430967-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Host</span><span·class="p"·data-group-id="3442430967-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·173,·SHA:·76602cf46b2724036b17fa74dd25f557c4385f6db79dad92f92d55e987906e07·...·]-3">)</span><span·class="p">,</span><span·class="w">
262 ····</span><span·class="o">#</span><span·class="ss">net_address</span><span·class="p"·data-group-id="1359639353-4">{</span><span·class="w">·</span><span·class="ss">host</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Host</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">protocol</span><sp[·...·truncated·by·diffoscope;·len:·611,·SHA:·fcbd59a8f3b478fdfce66e112b3143d98c0dba530aa937e5a76b883eea395ecb·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">262 ····</span><span·class="o">#</span><span·class="ss">net_address</span><span·class="p"·data-group-id="3442430967-4">{</span><span·class="w">·</span><span·class="ss">host</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Host</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">protocol</span><sp[·...·truncated·by·diffoscope;·len:·611,·SHA:·3c6572bc0e7ef3f0b25d1a8283dd2a85b821699d76854ce5e8fb3c7cf73ecdeb·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
263 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">AcceptorPid</span></code></pre><p><code·class="inline">accept/1</code>·should·spawn·a·process·that·accepts·connections.·This·process263 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">AcceptorPid</span></code></pre><p><code·class="inline">accept/1</code>·should·spawn·a·process·that·accepts·connections.·This·process
264 should·preferably·execute·on·<code·class="inline">max</code>·priority.·The·process·identifier·of·this264 should·preferably·execute·on·<code·class="inline">max</code>·priority.·The·process·identifier·of·this
265 process·should·be·returned.</p><p>The·<code·class="inline">Listen</code>·argument·will·be·the·same·as·the·<code·class="inline">Listen</code>·handle·part·of·the265 process·should·be·returned.</p><p>The·<code·class="inline">Listen</code>·argument·will·be·the·same·as·the·<code·class="inline">Listen</code>·handle·part·of·the
266 return·value·of·the·<a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback·above.266 return·value·of·the·<a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback·above.
267 <code·class="inline">accept/1</code>·is·called·only·once·when·the·distribution·protocol·is·started.</p><p>The·caller·of·this·function·is·a·representative·for·<code·class="inline">net_kernel</code>·(this·may·or267 <code·class="inline">accept/1</code>·is·called·only·once·when·the·distribution·protocol·is·started.</p><p>The·caller·of·this·function·is·a·representative·for·<code·class="inline">net_kernel</code>·(this·may·or
268 may·not·be·the·process·registered·as·<code·class="inline">net_kernel</code>)·and·is·in·this·document268 may·not·be·the·process·registered·as·<code·class="inline">net_kernel</code>)·and·is·in·this·document
269 identified·as·<code·class="inline">Kernel</code>.·When·a·connection·has·been·accepted·by·the·acceptor269 identified·as·<code·class="inline">Kernel</code>.·When·a·connection·has·been·accepted·by·the·acceptor
270 process,·it·needs·to·inform·<code·class="inline">Kernel</code>·about·the·accepted·connection.·This·is270 process,·it·needs·to·inform·<code·class="inline">Kernel</code>·about·the·accepted·connection.·This·is
271 done·by·passing·a·message·on·the·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Kernel</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3584302561-1">{</span><span·class="ss">accept</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AcceptorPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DistController</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·157,·SHA:·dcf5d1b1863587e293d70b8fde4eb0dfe2104d98c61bd88d0dddc200874032c1·...·]-1">}</span></code></pre><p><code·class="inline">DistController</code>·is·either·the·process·or·port·identifier·of·the·distribution271 done·by·passing·a·message·on·the·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Kernel</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7320206459-1">{</span><span·class="ss">accept</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AcceptorPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DistController</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·157,·SHA:·44a25561a04202ac865c7fbf77b50e9cb2da236d591a9d93dbd2715d47b05717·...·]-1">}</span></code></pre><p><code·class="inline">DistController</code>·is·either·the·process·or·port·identifier·of·the·distribution
272 controller·for·the·connection.·The·distribution·controller·should·be·created272 controller·for·the·connection.·The·distribution·controller·should·be·created
273 by·the·acceptor·processes·when·a·new·connection·is·accepted.·Its·job·is·to273 by·the·acceptor·processes·when·a·new·connection·is·accepted.·Its·job·is·to
274 dispatch·traffic·on·the·connection.</p><p><code·class="inline">Kernel</code>·responds·with·one·of·the·following·messages:</p><ul><li><p><strong><code·class="inline">{Kernel,·controller,·SupervisorPid}</code></strong>·-·The·request·was·accepted·and274 dispatch·traffic·on·the·connection.</p><p><code·class="inline">Kernel</code>·responds·with·one·of·the·following·messages:</p><ul><li><p><strong><code·class="inline">{Kernel,·controller,·SupervisorPid}</code></strong>·-·The·request·was·accepted·and
275 <code·class="inline">SupervisorPid</code>·is·the·process·identifier·of·the·connection·supervisor275 <code·class="inline">SupervisorPid</code>·is·the·process·identifier·of·the·connection·supervisor
276 process·(which·is·created·in·the276 process·(which·is·created·in·the
277 <a·href="alt_dist.html#accept_connection"><code·class="inline">accept_connection/5</code></a>·callback).</p></li><li><p><strong><code·class="inline">{Kernel,·unsupported_protocol}</code></strong>·-·The·request·was·rejected.·This·is·a277 <a·href="alt_dist.html#accept_connection"><code·class="inline">accept_connection/5</code></a>·callback).</p></li><li><p><strong><code·class="inline">{Kernel,·unsupported_protocol}</code></strong>·-·The·request·was·rejected.·This·is·a
278 fatal·error.·The·acceptor·process·should·terminate.</p></li></ul><p>When·an·accept·sequence·has·been·completed·the·acceptor·process·is·expected·to278 fatal·error.·The·acceptor·process·should·terminate.</p></li></ul><p>When·an·accept·sequence·has·been·completed·the·acceptor·process·is·expected·to
279 continue·accepting·further·requests.</p></li><li><pre·id="accept_connection"><code·class="makeup·erlang"·translate="no"><span·class="nf">accept_connection</span><span·class="p"·data-group-id="3058708666-1">(</span><span·class="n">AcceptorPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DistCtrl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyNode</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·155,·SHA:·b1ab06ef375b9cc564a0cb0f2fc45dd9775c1d79fc85a697cdea9884a1f544f7·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">279 continue·accepting·further·requests.</p></li><li><pre·id="accept_connection"><code·class="makeup·erlang"·translate="no"><span·class="nf">accept_connection</span><span·class="p"·data-group-id="8094193705-1">(</span><span·class="n">AcceptorPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DistCtrl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyNode</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·155,·SHA:·9b3c675acc50bc5a335ce55c1bc8c091c4f8686afbec61df2428602cfb86ba5b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
280 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">ConnectionSupervisorPid</span></code></pre><p><code·class="inline">accept_connection/5</code>·should·spawn·a·process·that·will·perform·the·Erlang280 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">ConnectionSupervisorPid</span></code></pre><p><code·class="inline">accept_connection/5</code>·should·spawn·a·process·that·will·perform·the·Erlang
281 distribution·handshake·for·the·connection.·If·the·handshake·successfully281 distribution·handshake·for·the·connection.·If·the·handshake·successfully
282 completes·it·should·continue·to·function·as·a·connection·supervisor.·This282 completes·it·should·continue·to·function·as·a·connection·supervisor.·This
283 process·should·preferably·execute·on·<code·class="inline">max</code>·priority·and·should·be·linked·to283 process·should·preferably·execute·on·<code·class="inline">max</code>·priority·and·should·be·linked·to
284 the·caller.·The·<code·class="inline">dist_util:net_ticker_spawn_options()</code>·function·can·be·called284 the·caller.·The·<code·class="inline">dist_util:net_ticker_spawn_options()</code>·function·can·be·called
285 to·get·spawn·options·suitable·for·this·process·which·can·be·passed·directly·to285 to·get·spawn·options·suitable·for·this·process·which·can·be·passed·directly·to
286 <a·href="erlang.html#spawn_opt/4"><code·class="inline">erlang:spawn_opt/4</code></a>.·<code·class="inline">dist_util:net_ticker_spawn_options()</code>·will·by·default286 <a·href="erlang.html#spawn_opt/4"><code·class="inline">erlang:spawn_opt/4</code></a>.·<code·class="inline">dist_util:net_ticker_spawn_options()</code>·will·by·default
Offset 294, 15 lines modifiedOffset 294, 15 lines modified
294 <code·class="inline">dist_util:handshake_other_started(HsData)</code>.</p></li><li><p><strong><code·class="inline">Allowed</code></strong>·-·To·be·passed·along·to294 <code·class="inline">dist_util:handshake_other_started(HsData)</code>.</p></li><li><p><strong><code·class="inline">Allowed</code></strong>·-·To·be·passed·along·to
295 <code·class="inline">dist_util:handshake_other_started(HsData)</code>.</p></li><li><p><strong><code·class="inline">SetupTime</code></strong>·-·Time·used·for·creating·a·setup·timer·by·a·call·to295 <code·class="inline">dist_util:handshake_other_started(HsData)</code>.</p></li><li><p><strong><code·class="inline">SetupTime</code></strong>·-·Time·used·for·creating·a·setup·timer·by·a·call·to
296 <code·class="inline">dist_util:start_timer(SetupTime)</code>.·The·timer·should·be·passed·along·to296 <code·class="inline">dist_util:start_timer(SetupTime)</code>.·The·timer·should·be·passed·along·to
297 <code·class="inline">dist_util:handshake_other_started(HsData)</code>.</p></li></ul><p>The·created·process·should·provide·callbacks·and·other·information·needed·for297 <code·class="inline">dist_util:handshake_other_started(HsData)</code>.</p></li></ul><p>The·created·process·should·provide·callbacks·and·other·information·needed·for
298 the·handshake·in·a·<a·href="alt_dist.html#hs_data_record"><code·class="inline">#hs_data{}</code></a>·record·and·call298 the·handshake·in·a·<a·href="alt_dist.html#hs_data_record"><code·class="inline">#hs_data{}</code></a>·record·and·call
299 <code·class="inline">dist_util:handshake_other_started(HsData)</code>·with·this·record.</p><p><code·class="inline">dist_util:handshake_other_started(HsData)</code>·will·perform·the·handshake·and·if299 <code·class="inline">dist_util:handshake_other_started(HsData)</code>·with·this·record.</p><p><code·class="inline">dist_util:handshake_other_started(HsData)</code>·will·perform·the·handshake·and·if
300 the·handshake·successfully·completes·this·process·will·then·continue·in·a300 the·handshake·successfully·completes·this·process·will·then·continue·in·a
301 connection·supervisor·loop·as·long·as·the·connection·is·up.</p></li><li><pre·id="setup"><code·class="makeup·erlang"·translate="no"><span·class="nf">setup</span><span·class="p"·data-group-id="5431183662-1">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyNode</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·150,·SHA:·5c08127f056a74a70f9da97ccbd8586758f6337a7f1e637a21f5eb853e298b51·...·]662-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">301 connection·supervisor·loop·as·long·as·the·connection·is·up.</p></li><li><pre·id="setup"><code·class="makeup·erlang"·translate="no"><span·class="nf">setup</span><span·class="p"·data-group-id="6428329662-1">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyNode</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·150,·SHA:·61c4c2738fecc2495f4af72f41160c1ff3f23487c568064fa879ea5d773e9be2·...·]662-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
302 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">ConnectionSupervisorPid</span></code></pre><p><code·class="inline">setup/5</code>·should·spawn·a·process·that·connects·to·<code·class="inline">Node</code>.·When·connection·has302 </span><span·class="err"> </span><span·class="err"> </span><span·class="n">ConnectionSupervisorPid</span></code></pre><p><code·class="inline">setup/5</code>·should·spawn·a·process·that·connects·to·<code·class="inline">Node</code>.·When·connection·has
303 been·established·it·should·perform·the·Erlang·distribution·handshake·for·the303 been·established·it·should·perform·the·Erlang·distribution·handshake·for·the
304 connection.·If·the·handshake·successfully·completes·it·should·continue·to304 connection.·If·the·handshake·successfully·completes·it·should·continue·to
305 function·as·a·connection·supervisor.·This·process·should·preferably·execute·on305 function·as·a·connection·supervisor.·This·process·should·preferably·execute·on
306 <code·class="inline">max</code>·priority·and·should·be·linked·to·the·caller.·The306 <code·class="inline">max</code>·priority·and·should·be·linked·to·the·caller.·The
307 <code·class="inline">dist_util:net_ticker_spawn_options()</code>·function·can·be·called·to·get·spawn307 <code·class="inline">dist_util:net_ticker_spawn_options()</code>·function·can·be·called·to·get·spawn
308 options·suitable·for·this·process·which·can·be·passed·directly·to308 options·suitable·for·this·process·which·can·be·passed·directly·to
Offset 320, 23 lines modifiedOffset 320, 23 lines modified
320 may·not·be·the·process·registered·as·<code·class="inline">net_kernel</code>)·and·is·in·this·document320 may·not·be·the·process·registered·as·<code·class="inline">net_kernel</code>)·and·is·in·this·document
321 identified·as·<code·class="inline">Kernel</code>.</p><p>This·function·should,·besides·spawning·the·connection·supervisor,·also·create321 identified·as·<code·class="inline">Kernel</code>.</p><p>This·function·should,·besides·spawning·the·connection·supervisor,·also·create
322 a·distribution·controller.·The·distribution·controller·is·either·a·process·or322 a·distribution·controller.·The·distribution·controller·is·either·a·process·or
323 a·port·which·is·responsible·for·dispatching·traffic.</p><p>The·created·process·should·provide·callbacks·and·other·information·needed·for323 a·port·which·is·responsible·for·dispatching·traffic.</p><p>The·created·process·should·provide·callbacks·and·other·information·needed·for
324 the·handshake·in·a·<a·href="alt_dist.html#hs_data_record"><code·class="inline">#hs_data{}</code></a>·record·and·call324 the·handshake·in·a·<a·href="alt_dist.html#hs_data_record"><code·class="inline">#hs_data{}</code></a>·record·and·call
325 <code·class="inline">dist_util:handshake_we_started(HsData)</code>·with·this·record.</p><p><code·class="inline">dist_util:handshake_we_started(HsData)</code>·will·perform·the·handshake·and·the325 <code·class="inline">dist_util:handshake_we_started(HsData)</code>·with·this·record.</p><p><code·class="inline">dist_util:handshake_we_started(HsData)</code>·will·perform·the·handshake·and·the
326 handshake·successfully·completes·this·process·will·then·continue·in·a326 handshake·successfully·completes·this·process·will·then·continue·in·a
327 connection·supervisor·loop·as·long·as·the·connection·is·up.</p></li><li><pre·id="close"><code·class="makeup·erlang"·translate="no"><span·class="nf">close</span><span·class="p"·data-group-id="2507674723-1">(</span><span·class="n">Listen</span><span·class="p"·data-group-id="2507674723-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">327 connection·supervisor·loop·as·long·as·the·connection·is·up.</p></li><li><pre·id="close"><code·class="makeup·erlang"·translate="no"><span·class="nf">close</span><span·class="p"·data-group-id="6677765052-1">(</span><span·class="n">Listen</span><span·class="p"·data-group-id="6677765052-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
328 </span><span·class="err"> </span><span·class="err"> </span><span·class="nf">void</span><span·class="p"·data-group-id="2507674723-2">(</span><span·class="p"·data-group-id="2507674723-2">)</span></code></pre><p>Called·in·order·to·close·the·<code·class="inline">Listen</code>·handle·that·originally·was·passed·from328 </span><span·class="err"> </span><span·class="err"> </span><span·class="nf">void</span><span·class="p"·data-group-id="6677765052-2">(</span><span·class="p"·data-group-id="6677765052-2">)</span></code></pre><p>Called·in·order·to·close·the·<code·class="inline">Listen</code>·handle·that·originally·was·passed·from
329 the·<a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback.</p></li><li><pre·id="select"><code·class="makeup·erlang"·translate="no"><span·class="nf">select</span><span·class="p"·data-group-id="9027382073-1">(</span><span·class="n">NodeName</span><span·class="p"·data-group-id="9027382073-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">329 the·<a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback.</p></li><li><pre·id="select"><code·class="makeup·erlang"·translate="no"><span·class="nf">select</span><span·class="p"·data-group-id="3176716474-1">(</span><span·class="n">NodeName</span><span·class="p"·data-group-id="3176716474-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
330 </span><span·class="err"> </span><span·class="err"> </span><span·class="nf">boolean</span><span·class="p"·data-group-id="9027382073-2">(</span><span·class="p"·data-group-id="9027382073-2">)</span></code></pre><p>Return·<code·class="inline">true</code>·if·the·host·name·part·of·the·<code·class="inline">NodeName</code>·is·valid·for·use·with330 </span><span·class="err"> </span><span·class="err"> </span><span·class="nf">boolean</span><span·class="p"·data-group-id="3176716474-2">(</span><span·class="p"·data-group-id="3176716474-2">)</span></code></pre><p>Return·<code·class="inline">true</code>·if·the·host·name·part·of·the·<code·class="inline">NodeName</code>·is·valid·for·use·with
331 this·protocol;·otherwise,·<code·class="inline">false</code>.</p></li></ul><p>There·are·also·two·optional·functions·that·may·be·exported:</p><ul><li><pre·id="setopts"><code·class="makeup·erlang"·translate="no"><span·class="nf">setopts</span><span·class="p"·data-group-id="4811792378-1">(</span><span·class="n">Listen</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opts</span><span·class="p"·data-group-id="4811792378-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
332 </span><span·class="err"> </span><span·class="err"> </span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="4811792378-2">{</span><span·class="ss">error</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·216,·SHA:·1f5c1ca8ae82aded4d582ae54760360f19db87d874625b20475485f387459d68·...·]331 this·protocol;·otherwise,·<code·class="inline">false</code>.</p></li></ul><p>There·are·also·two·optional·functions·that·may·be·exported:</p><ul><li><pre·id="setopts"><code·class="makeup·erlang"·translate="no"><span·class="nf">setopts</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·262,·SHA:·14f66e58544732ae712272be18663a2d42bfd05cbdc714f5d06370dc8b439d00·...·]
 332 </span><span·class="err"> </span><span·class="err"> </span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="8968404664-2">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error</span><span·class="p"·data-group-id="8968404664-2">}</span></code></pre><p>The·argument·<code·class="inline">Listen</code>·is·the·handle·originally·passed·from·the
333 <a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback.·The·argument·<code·class="inline">Opts</code>·is·a·list·of333 <a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback.·The·argument·<code·class="inline">Opts</code>·is·a·list·of
334 options·to·set·on·future·connections.</p></li><li><pre·id="getopts"><code·class="makeup·erlang"·translate="no"><span·class="nf">getopts</span><span·class="p"·data-group-id="7289547617-1">(</span><span·class="n">Listen</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opts</span><span·class="p"·data-group-id="7289547617-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
335 </span><span·class="err"> </span><span·class="err"> </span><span·class="p"·data-group-id="7289547617-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OptionValues</span><span·class="p"·data-group-id="7289[·...·truncated·by·diffoscope;·len:·405,·SHA:·84f53b97c9379077be4730f3f7fecdfed6fe9c4eccd84d1ea24c6da8f16c3032·...·]334 options·to·set·on·future·connections.</p></li><li><pre·id="getopts"><code·class="makeup·erlang"·translate="no"><span·class="nf">getopts</span><span·class="p"·data-group-id="3215474145-1">(</span><span·class="n">Listen</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·164,·SHA:·a39e3e45001b1f15720a9ee689b6d32d2bc3fb259a38478a19bb41b93978aac2·...·]
 335 </span><span·class="err"> </span><span·class="err"> </span><span·class="p"·data-group-id="3215474145-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OptionValues</span><span·class="p"·data-group-id="3215474145-2">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3215474145-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error</span><span·class="p"·data-group-id="3215474145-3">}</span></code></pre><p>The·argument·<code·class="inline">Listen</code>·is·the·handle·originally·passed·from·the
336 <a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback.·The·argument·<code·class="inline">Opts</code>·is·a·list·of336 <a·href="alt_dist.html#listen"><code·class="inline">listen/1</code></a>·callback.·The·argument·<code·class="inline">Opts</code>·is·a·list·of
337 options·to·read·for·future·connections.</p></li></ul><p><a·href=""·id="hs_data_record"></a></p><h3·id="the-hs_data-record"·class="section-heading">337 options·to·read·for·future·connections.</p></li></ul><p><a·href=""·id="hs_data_record"></a></p><h3·id="the-hs_data-record"·class="section-heading">
338 ··<a·href="#the-hs_data-record"·class="hover-link">338 ··<a·href="#the-hs_data-record"·class="hover-link">
339 ····<i·class="ri-link-m"·aria-hidden="true"></i>339 ····<i·class="ri-link-m"·aria-hidden="true"></i>
340 ··</a>340 ··</a>
341 ··<span·class="text">The·#hs_data{}·Record</span>341 ··<span·class="text">The·#hs_data{}·Record</span>
342 </h3>342 </h3>
Offset 350, 44 lines modifiedOffset 350, 44 lines modified
350 <a·href="alt_dist.html#accept_connection"><code·class="inline">accept_connection/5</code></a>.</p></li><li><p><strong><code·class="inline"·id="hs_data_other_node">other_node</code></strong>·-·Name·of·the·other·node.·This·field350 <a·href="alt_dist.html#accept_connection"><code·class="inline">accept_connection/5</code></a>.</p></li><li><p><strong><code·class="inline"·id="hs_data_other_node">other_node</code></strong>·-·Name·of·the·other·node.·This·field
351 is·only·mandatory·when·this·node·initiates·the·connection.·That·is,·when351 is·only·mandatory·when·this·node·initiates·the·connection.·That·is,·when
352 connection·is·set·up·via·<a·href="alt_dist.html#setup"><code·class="inline">setup/5</code></a>.</p></li><li><p><strong><code·class="inline"·id="hs_data_this_node">this_node</code></strong>·-·The·node·name·of·this·node.</p></li><li><p><strong><code·class="inline"·id="hs_data_socket">socket</code></strong>·-·The·identifier·of·the·distribution352 connection·is·set·up·via·<a·href="alt_dist.html#setup"><code·class="inline">setup/5</code></a>.</p></li><li><p><strong><code·class="inline"·id="hs_data_this_node">this_node</code></strong>·-·The·node·name·of·this·node.</p></li><li><p><strong><code·class="inline"·id="hs_data_socket">socket</code></strong>·-·The·identifier·of·the·distribution
353 controller.</p></li><li><p><strong><code·class="inline"·id="hs_data_timer">timer</code></strong>·-·The·timer·created·using353 controller.</p></li><li><p><strong><code·class="inline"·id="hs_data_timer">timer</code></strong>·-·The·timer·created·using
354 <code·class="inline">dist_util:start_timer/1</code>.</p></li><li><p><strong><code·class="inline"·id="hs_data_allowed">allowed</code></strong>·-·Information·passed·as·<code·class="inline">Allowed</code>·to354 <code·class="inline">dist_util:start_timer/1</code>.</p></li><li><p><strong><code·class="inline"·id="hs_data_allowed">allowed</code></strong>·-·Information·passed·as·<code·class="inline">Allowed</code>·to
355 <code·class="inline">accept_connection/5</code>.·This·field·is·only·mandatory·when·the·remote·node355 <code·class="inline">accept_connection/5</code>.·This·field·is·only·mandatory·when·the·remote·node
356 initiated·the·connection.·That·is,·when·the·connection·is·set·up·via356 initiated·the·connection.·That·is,·when·the·connection·is·set·up·via
357 <a·href="alt_dist.html#accept_connection"><code·class="inline">accept_connection/5</code></a>.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_send">f_send</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7787173703-1">(</span><span·class="n">DistCtrlr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="7787173703-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·295,·SHA:·50763c8a76e16cbb4e09a0e5f9be27126f666c0c5459f91ef644676081bafb4a·...·]03-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller·and·<code·class="inline">Data</code>357 <a·href="alt_dist.html#accept_connection"><code·class="inline">accept_connection/5</code></a>.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_send">f_send</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7702054903-1">(</span><span·class="n">DistCtrlr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="7702054903-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·295,·SHA:·8e8b56fd55df3ce5c2cbeb1f6f5aacff8a1546fe0fef8591ef37f7a623395152·...·]03-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller·and·<code·class="inline">Data</code>
358 is·io·data·to·pass·to·the·other·side.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_recv">f_recv</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7042625232-1">(</span><span·class="n">DistCtrlr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Length</span><span·class="p"·data-group-id="7042625232-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·485,·SHA:·bd1fbc65ab26a40850275c9455f6943afa1722ece7f49e97af5cd59138c92ea2·...·]-3">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·If358 is·io·data·to·pass·to·the·other·side.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_recv">f_recv</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="8096585131-1">(</span><span·class="n">DistCtrlr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Length</span><span·class="p"·data-group-id="8096585131-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·485,·SHA:·1b91e5b5938ed6b24213b7b419e0fb5799f4d739a5750a0edc03f7ef69d6c55b·...·]-3">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·If
359 <code·class="inline">Length</code>·is·<code·class="inline">0</code>,·all·available·bytes·should·be·returned.·If·<code·class="inline">Length·&gt;·0</code>,359 <code·class="inline">Length</code>·is·<code·class="inline">0</code>,·all·available·bytes·should·be·returned.·If·<code·class="inline">Length·&gt;·0</code>,
360 exactly·<code·class="inline">Length</code>·bytes·should·be·returned,·or·an·error;·possibly·discarding360 exactly·<code·class="inline">Length</code>·bytes·should·be·returned,·or·an·error;·possibly·discarding
361 less·than·<code·class="inline">Length</code>·bytes·of·data·when·the·connection·is·closed·from·the·other361 less·than·<code·class="inline">Length</code>·bytes·of·data·when·the·connection·is·closed·from·the·other
362 side.·It·is·used·for·passive·receive·of·data·from·the·other·end.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_setopts_pre_nodeup">f_setopts_pre_nodeup</code></strong>·-·A·fun·with·the362 side.·It·is·used·for·passive·receive·of·data·from·the·other·end.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_setopts_pre_nodeup">f_setopts_pre_nodeup</code></strong>·-·A·fun·with·the
363 following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="8145029995-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="8145029995-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span>[·...·truncated·by·diffoscope;·len:·223,·SHA:·c070580b421d2f6e319c70a3889331949ce341cbba213f7f93419a3d250281ef·...·]-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·Called363 following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="8698292372-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="8698292372-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span>[·...·truncated·by·diffoscope;·len:·223,·SHA:·0e67f4a08295335ac25559775bf6cb97b671c1cedf24b668a30e5e0610059027·...·]-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·Called
364 just·before·the·distribution·channel·is·taken·up·for·normal·traffic.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_setopts_post_nodeup">f_setopts_post_nodeup</code></strong>·-·A·fun·with364 just·before·the·distribution·channel·is·taken·up·for·normal·traffic.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_setopts_post_nodeup">f_setopts_post_nodeup</code></strong>·-·A·fun·with
365 the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5833771597-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="5833771597-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span>[·...·truncated·by·diffoscope;·len:·223,·SHA:·38163dc53fe8243be665ae1ca53ad14559e820d07c051986ab8922e1445c6388·...·]-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·Called365 the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5645741798-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="5645741798-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span>[·...·truncated·by·diffoscope;·len:·223,·SHA:·cd3f011cc2b4f79385aaa1d7059f90aea9367dd7b376e209ec8a7d80f1d3982f·...·]-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·Called
366 just·after·distribution·channel·has·been·taken·up·for·normal·traffic.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_getll">f_getll</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1918170207-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="1918170207-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">ID</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller·and·<code·class="inline">ID</code>·is366 just·after·distribution·channel·has·been·taken·up·for·normal·traffic.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_getll">f_getll</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="0596482360-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="0596482360-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">ID</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller·and·<code·class="inline">ID</code>·is
367 the·identifier·of·the·low·level·entity·that·handles·the·connection·(often367 the·identifier·of·the·low·level·entity·that·handles·the·connection·(often
368 <code·class="inline">DistCtrlr</code>·itself).</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_address">f_address</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="3225225107-1">(</span><span·class="n">DistCtrlr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="3225225107-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">NetAddress</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller,·<code·class="inline">Node</code>·is368 <code·class="inline">DistCtrlr</code>·itself).</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_f_address">f_address</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5916718315-1">(</span><span·class="n">DistCtrlr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="5916718315-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">NetAddress</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller,·<code·class="inline">Node</code>·is
369 the·node·name·of·the·node·on·the·other·end,·and·<code·class="inline">NetAddress</code>·is·a369 the·node·name·of·the·node·on·the·other·end,·and·<code·class="inline">NetAddress</code>·is·a
370 <code·class="inline">#net_address{}</code>·record·with·information·about·the·address·for·the·<code·class="inline">Node</code>·on370 <code·class="inline">#net_address{}</code>·record·with·information·about·the·address·for·the·<code·class="inline">Node</code>·on
371 the·other·end·of·the·connection.·The·<code·class="inline">#net_address{}</code>·record·is·defined·in371 the·other·end·of·the·connection.·The·<code·class="inline">#net_address{}</code>·record·is·defined·in
372 <code·class="inline">kernel/include/net_address.hrl</code>.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_mf_tick">mf_tick</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="3178305032-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="3178305032-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">void</span><span·class="p"·data-group-id="3178305032-2">[·...·truncated·by·diffoscope;·len:·49,·SHA:·a12a183c6e522ed74ab2ef4f53496f2a1d9a31e7fd5cf41c23f437b9485b80e0·...·]-2">)</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·This372 <code·class="inline">kernel/include/net_address.hrl</code>.</p><p>Only·used·during·handshake·phase.</p></li><li><p><strong><code·class="inline"·id="hs_data_mf_tick">mf_tick</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6021058198-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="6021058198-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">void</span><span·class="p"·data-group-id="6021058198-2">[·...·truncated·by·diffoscope;·len:·49,·SHA:·4774b6a2baacde9bde04ad15b6b41a5c16c585b449dccab14d05a741c66be6ca·...·]-2">)</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller.·This
373 function·should·send·information·over·the·connection·that·is·not·interpreted373 function·should·send·information·over·the·connection·that·is·not·interpreted
374 by·the·other·end·while·increasing·the·statistics·of·received·packets·on·the374 by·the·other·end·while·increasing·the·statistics·of·received·packets·on·the
375 other·end.·This·is·usually·implemented·by·sending·an·empty·packet.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>It·is·of·vital·importance·that·this·operation·does·not·block·the·caller·for375 other·end.·This·is·usually·implemented·by·sending·an·empty·packet.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>It·is·of·vital·importance·that·this·operation·does·not·block·the·caller·for
376 a·long·time.·This·since·it·is·called·from·the·connection·supervisor.</p></section><p>Used·when·connection·is·up.</p></li><li><p><strong><code·class="inline"·id="hs_data_mf_getstat">mf_getstat</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9847316010-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="9847316010-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9847316010-2">{</span><span·class="ss">ok<[·...·truncated·by·diffoscope;·len:·280,·SHA:·c1be0d5d11610db4ea2ff2ccf4b19f7ab3b93411cbed5aa257b1158dd5234404·...·]-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller,·<code·class="inline">Received</code>376 a·long·time.·This·since·it·is·called·from·the·connection·supervisor.</p></section><p>Used·when·connection·is·up.</p></li><li><p><strong><code·class="inline"·id="hs_data_mf_getstat">mf_getstat</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7106919554-1">(</span><span·class="n">DistCtrlr</span><span·class="p"·data-group-id="7106919554-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7106919554-2">{</span><span·class="ss">ok<[·...·truncated·by·diffoscope;·len:·280,·SHA:·347cf64c29c43a65ad287bced5475b4e3a63989340f4417eae90dce5c3162660·...·]-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller,·<code·class="inline">Received</code>
377 is·received·packets,·<code·class="inline">Sent</code>·is·sent·packets,·and·<code·class="inline">PendSend</code>·is·amount·of·data377 is·received·packets,·<code·class="inline">Sent</code>·is·sent·packets,·and·<code·class="inline">PendSend</code>·is·amount·of·data
378 in·queue·to·be·sent·(typically·in·bytes,·but·<code·class="inline">dist_util</code>·only·checks·whether378 in·queue·to·be·sent·(typically·in·bytes,·but·<code·class="inline">dist_util</code>·only·checks·whether
379 the·value·is·non-zero·to·know·there·is·data·in·queue)·or·a·<a·href="erlang.html#t:boolean/0"><code·class="inline">boolean/0</code></a>379 the·value·is·non-zero·to·know·there·is·data·in·queue)·or·a·<a·href="erlang.html#t:boolean/0"><code·class="inline">boolean/0</code></a>
380 indicating·whether·there·are·packets·in·queue·to·be·sent.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>It·is·of·vital·importance·that·this·operation·does·not·block·the·caller·for380 indicating·whether·there·are·packets·in·queue·to·be·sent.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>It·is·of·vital·importance·that·this·operation·does·not·block·the·caller·for
381 a·long·time.·This·since·it·is·called·from·the·connection·supervisor.</p></section><p>Used·when·connection·is·up.</p></li><li><p><strong><code·class="inline"·id="hs_data_request_type">request_type</code></strong>·-·The·request·<code·class="inline">Type</code>·as·passed·to381 a·long·time.·This·since·it·is·called·from·the·connection·supervisor.</p></section><p>Used·when·connection·is·up.</p></li><li><p><strong><code·class="inline"·id="hs_data_request_type">request_type</code></strong>·-·The·request·<code·class="inline">Type</code>·as·passed·to
382 <a·href="alt_dist.html#setup"><code·class="inline">setup/5</code></a>.·This·is·only·mandatory·when·the·connection·has382 <a·href="alt_dist.html#setup"><code·class="inline">setup/5</code></a>.·This·is·only·mandatory·when·the·connection·has
383 been·initiated·by·this·node.·That·is,·the·connection·is·set·up·via·<code·class="inline">setup/5</code>.</p></li><li><p><strong><code·class="inline"·id="hs_data_mf_setopts">mf_setopts</code></strong>·-·A·fun·with·the·following·signature:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5131632536-1">(</span><span·class="n">DistCtrl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opts</span><span·class="p"·data-group-id="5131632536-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="5131632536-2">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error</span><span·class="p"·data-group-id="5131632536-2">}</span></code></pre><p>where·<code·class="inline">DistCtrlr</code>·is·the·identifier·of·the·distribution·controller·and·<code·class="inline">Opts</code> 
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241 ······<p·class="built-using">241 ······<p·class="built-using">
242 ········Built·using242 ········Built·using
243 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the243 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
244 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>244 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
245 ······</p>245 ······</p>
246 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>246 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
247 ····</footer>247 ····</footer>
248 ··</div>248 ··</div>
249 </main>249 </main>
250 </div>250 </div>
251 <script>251 <script>
252 ··function·mermaidLoaded()·{252 ··function·mermaidLoaded()·{
253 ····mermaid.initialize({253 ····mermaid.initialize({
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642 ········Built·using642 ········Built·using
643 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the643 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
644 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>644 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
645 ······</p>645 ······</p>
646 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>646 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
647 ····</footer>647 ····</footer>
648 ··</div>648 ··</div>
649 </main>649 </main>
650 </div>650 </div>
651 <script>651 <script>
652 ··function·mermaidLoaded()·{652 ··function·mermaidLoaded()·{
653 ····mermaid.initialize({653 ····mermaid.initialize({
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209 they·have·to·follow·certain·restrictions.·The·convention·for·making209 they·have·to·follow·certain·restrictions.·The·convention·for·making
210 this·clear·is·to·have·a·comment·above·the·function·that·explains·that210 this·clear·is·to·have·a·comment·above·the·function·that·explains·that
211 the·function·is·transformed·by·YCF·(see·<code·class="inline">maps_values_1_helper</code>·in211 the·function·is·transformed·by·YCF·(see·<code·class="inline">maps_values_1_helper</code>·in
212 <code·class="inline">erl_map.c</code>·for·an·example).·If·only·the·transformed·version·of·the212 <code·class="inline">erl_map.c</code>·for·an·example).·If·only·the·transformed·version·of·the
213 function·is·used,·the·convention·is·to·&quot;comment·out&quot;·the·source·for·the213 function·is·used,·the·convention·is·to·&quot;comment·out&quot;·the·source·for·the
214 function·by·surrounding·it·with·the·following·<code·class="inline">#ifdef</code>·(this·way,·one214 function·by·surrounding·it·with·the·following·<code·class="inline">#ifdef</code>·(this·way,·one
215 will·not·get·warnings·about·unused·functions):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">#</span><span·class="ss">ifdef</span><span·class="w">·</span><span·class="n">INCLUDE_YCF_TRANSFORMED_ONLY_FUNCTIONS</span><span·class="w">215 will·not·get·warnings·about·unused·functions):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">#</span><span·class="ss">ifdef</span><span·class="w">·</span><span·class="n">INCLUDE_YCF_TRANSFORMED_ONLY_FUNCTIONS</span><span·class="w">
216 </span><span·class="ss">void</span><span·class="w">·</span><span·class="nf">my_fun</span><span·class="p"·data-group-id="4957351293-1">(</span><span·class="p"·data-group-id="4957351293-1">)</span><span·class="w">·</span><span·class="p"·data-group-id="4957351293-2">{</span><span·class="w">216 </span><span·class="ss">void</span><span·class="w">·</span><span·class="nf">my_fun</span><span·class="p"·data-group-id="5382319964-1">(</span><span·class="p"·data-group-id="5382319964-1">)</span><span·class="w">·</span><span·class="p"·data-group-id="5382319964-2">{</span><span·class="w">
217 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">217 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
218 </span><span·class="p"·data-group-id="4957351293-2">}</span><span·class="w">218 </span><span·class="p"·data-group-id="5382319964-2">}</span><span·class="w">
219 </span><span·class="p">#</span><span·class="ss">endif</span><span·class="w">·</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">INCLUDE_YCF_TRANSFORMED_ONLY_FUNCTIONS</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span></code></pre><p>While·editing·the·function·one·can·define219 </span><span·class="p">#</span><span·class="ss">endif</span><span·class="w">·</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">INCLUDE_YCF_TRANSFORMED_ONLY_FUNCTIONS</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span></code></pre><p>While·editing·the·function·one·can·define
220 <code·class="inline">INCLUDE_YCF_TRANSFORMED_ONLY_FUNCTIONS</code>·so·that·one·can·see·errors220 <code·class="inline">INCLUDE_YCF_TRANSFORMED_ONLY_FUNCTIONS</code>·so·that·one·can·see·errors
221 and·warnings·in·the·non-transformed·source.</p><h3·id="where-to-place-ycf-transformed-functions"·class="section-heading">221 and·warnings·in·the·non-transformed·source.</p><h3·id="where-to-place-ycf-transformed-functions"·class="section-heading">
222 ··<a·href="#where-to-place-ycf-transformed-functions"·class="hover-link">222 ··<a·href="#where-to-place-ycf-transformed-functions"·class="hover-link">
223 ····<i·class="ri-link-m"·aria-hidden="true"></i>223 ····<i·class="ri-link-m"·aria-hidden="true"></i>
224 ··</a>224 ··</a>
225 ··<span·class="text">Where·to·Place·YCF·Transformed·Functions</span>225 ··<span·class="text">Where·to·Place·YCF·Transformed·Functions</span>
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365 ······<p·class="built-using">365 ······<p·class="built-using">
366 ········Built·using366 ········Built·using
367 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the367 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
368 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>368 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
369 ······</p>369 ······</p>
370 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>370 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
371 ····</footer>371 ····</footer>
372 ··</div>372 ··</div>
373 </main>373 </main>
374 </div>374 </div>
375 <script>375 <script>
376 ··function·mermaidLoaded()·{376 ··function·mermaidLoaded()·{
377 ····mermaid.initialize({377 ····mermaid.initialize({
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145 </h2>145 </h2>
146 <p>The·code·is·loaded·very·similarly·to·how·it·is·loaded·for·the·interpreter.·Each·beam146 <p>The·code·is·loaded·very·similarly·to·how·it·is·loaded·for·the·interpreter.·Each·beam
147 file·is·parsed·and·then·optimized·through·the·transformations·described·in147 file·is·parsed·and·then·optimized·through·the·transformations·described·in
148 <a·href="beam_makeops.html#defining-transformation-rules">beam_makeops</a>.·The·transformations148 <a·href="beam_makeops.html#defining-transformation-rules">beam_makeops</a>.·The·transformations
149 used·in·BeamAsm·are·much·simpler·than·the·interpreter's,·as·most·of·the149 used·in·BeamAsm·are·much·simpler·than·the·interpreter's,·as·most·of·the
150 transformations·for·the·interpreter·are·done·only·to·eliminate·the·instruction150 transformations·for·the·interpreter·are·done·only·to·eliminate·the·instruction
151 dispatch·overhead.</p><p>Then·each·instruction·is·encoded·using·the·C++·functions·in·the151 dispatch·overhead.</p><p>Then·each·instruction·is·encoded·using·the·C++·functions·in·the
152 <code·class="inline">jit/$ARCH/instr_*.cpp</code>·files.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">void</span><span·class="w">·</span><span·class="n">BeamModuleAssembler</span><span·class="p">:</span><span·class="p">:</span><span·class="nf">emit_is_nonempty_list</span><span·class="p"·data-group-id="0733055711-1">(</span><span·class="ss">const</span><span·class="w">·</span><span·class="n">ArgVal</span><span·class="w">·</span><span·class="err">&amp;</span><span·class="n">Fail</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">const<[·...·truncated·by·diffoscope;·len:·257,·SHA:·86f512eca1e1121a3138049f3623cd714249c5e40e374a7807093a5a479ad4b5·...·]-2">{</span><span·class="w">152 <code·class="inline">jit/$ARCH/instr_*.cpp</code>·files.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">void</span><span·class="w">·</span><span·class="n">BeamModuleAssembler</span><span·class="p">:</span><span·class="p">:</span><span·class="nf">emit_is_nonempty_list</span><span·class="p"·data-group-id="4793012193-1">(</span><span·class="ss">const</span><span·class="w">·</span><span·class="n">ArgVal</span><span·class="w">·</span><span·class="err">&amp;</span><span·class="n">Fail</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">const<[·...·truncated·by·diffoscope;·len:·257,·SHA:·f4942f5ed242a816d859ad54d860100af30cdee16f66e3b7105aa1ee48704107·...·]-2">{</span><span·class="w">
153 ··</span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">test</span><span·class="p"·data-group-id="0733055711-3">(</span><span·class="nf">getArgRef</span><span·class="p"·data-group-id="0733055711-4">(</span><span·class="n">Src</span><span·class="p"·data-group-id="0733055711-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">imm<[·...·truncated·by·diffoscope;·len:·327,·SHA:·ef788e4159bf7038771953611a5c0615a204b3627c220768e35163ad6cd248b4·...·]-3">)</span><span·class="p">;</span><span·class="w">153 ··</span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">test</span><span·class="p"·data-group-id="4793012193-3">(</span><span·class="nf">getArgRef</span><span·class="p"·data-group-id="4793012193-4">(</span><span·class="n">Src</span><span·class="p"·data-group-id="4793012193-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">imm<[·...·truncated·by·diffoscope;·len:·327,·SHA:·dc2e4acdb8867300a180c6a5c4ea66a3cdfc2acc3024ba6dab0083e39b6475f6·...·]-3">)</span><span·class="p">;</span><span·class="w">
154 ··</span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">jne</span><span·class="p"·data-group-id="0733055711-6">(</span><span·class="ss">labels</span><span·class="p"·data-group-id="0733055711-7">[</span><span·class="n">Fail</span><span·class="p">.</span><span·class="nf">getLabel</span><span·class="p"·data-group-id="0733055711-8">(</span><span·class="p"[·...·truncated·by·diffoscope;·len:·132,·SHA:·365f855d406790e7df953f7e834c8a3258dcb0bfb4de540a4b1504c28fa91062·...·]-6">)</span><span·class="p">;</span><span·class="w">154 ··</span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">jne</span><span·class="p"·data-group-id="4793012193-6">(</span><span·class="ss">labels</span><span·class="p"·data-group-id="4793012193-7">[</span><span·class="n">Fail</span><span·class="p">.</span><span·class="nf">getLabel</span><span·class="p"·data-group-id="4793012193-8">(</span><span·class="p"[·...·truncated·by·diffoscope;·len:·132,·SHA:·d02e18167cfc7aeae483ce04c1ca0653a72c75694c4ad4b7bb78c54b05a85540·...·]-6">)</span><span·class="p">;</span><span·class="w">
155 </span><span·class="p"·data-group-id="0733055711-2">}</span></code></pre><p><a·href="https://github.com/asmjit/asmjit">asmjit</a>·provides·a·fairly·straightforward155 </span><span·class="p"·data-group-id="4793012193-2">}</span></code></pre><p><a·href="https://github.com/asmjit/asmjit">asmjit</a>·provides·a·fairly·straightforward
156 mapping·from·a·C++·function·call·to·the·x86·assembly·instruction.·The·above156 mapping·from·a·C++·function·call·to·the·x86·assembly·instruction.·The·above
157 instruction·tests·if·the·value·in·the·<code·class="inline">Src</code>·register·is·a·non-empty·list·and·if157 instruction·tests·if·the·value·in·the·<code·class="inline">Src</code>·register·is·a·non-empty·list·and·if
158 it·is·not·then·it·jumps·to·the·fail·label.</p><p>For·comparison,·the·interpreter·has·8·combinations·and·specializations·of158 it·is·not·then·it·jumps·to·the·fail·label.</p><p>For·comparison,·the·interpreter·has·8·combinations·and·specializations·of
159 this·implementation·to·minimize·the·instruction·dispatch·overhead·for159 this·implementation·to·minimize·the·instruction·dispatch·overhead·for
160 common·patterns.</p><p>The·original·register·allocation·done·by·the·Erlang·compiler·is·used·to·manage·the160 common·patterns.</p><p>The·original·register·allocation·done·by·the·Erlang·compiler·is·used·to·manage·the
161 liveness·of·values·and·the·physical·registers·are·statically·allocated·to·keep161 liveness·of·values·and·the·physical·registers·are·statically·allocated·to·keep
162 the·necessary·process·state.·At·the·moment·this·is·the·static·register162 the·necessary·process·state.·At·the·moment·this·is·the·static·register
163 allocation·on·x86-64:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">rbx</span><span·class="p">:</span><span·class="w">·</span><span·class="n">ErtsSchedulerRegisters</span><span·class="w">·</span><span·class="nf">struct</span><span·class="w">·</span><span·class="p"·data-group-id="7227499186-1">(</span><span·class="ss">contains</span><span·class="w">·</span><span·class="ss">x</span><span·class="o">/</span><span·class="nb">float</span><span·class="w">·</span><span·class="ss">registers</span><span·class="w">·</span><span·class="ow">an[·...·truncated·by·diffoscope;·len:·157,·SHA:·1676480e8827f1ed2e7a0da455e5755e9e0c0b9ce1e9075c642a445c1e092b2e·...·]-1">)</span><span·class="w">163 allocation·on·x86-64:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">rbx</span><span·class="p">:</span><span·class="w">·</span><span·class="n">ErtsSchedulerRegisters</span><span·class="w">·</span><span·class="nf">struct</span><span·class="w">·</span><span·class="p"·data-group-id="5684220024-1">(</span><span·class="ss">contains</span><span·class="w">·</span><span·class="ss">x</span><span·class="o">/</span><span·class="nb">float</span><span·class="w">·</span><span·class="ss">registers</span><span·class="w">·</span><span·class="ow">an[·...·truncated·by·diffoscope;·len:·157,·SHA:·6dcb8e8621ca46f62b94653502aa95588f4ef73e5f9a38867527bff0623c6a74·...·]-1">)</span><span·class="w">
164 </span><span·class="nc">rbp</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Current</span><span·class="w">·</span><span·class="ss">frame</span><span·class="w">·</span><span·class="ss">pointer</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="err">`</span><span·class="ss">perf</span><span·class="err">`</span><span·class="w">·</span><span·class="ss">support</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">enabled</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">otherwise</span><span·class="w">·</span><span·class="ss">this</span><span·class="w">164 </span><span·class="nc">rbp</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Current</span><span·class="w">·</span><span·class="ss">frame</span><span·class="w">·</span><span·class="ss">pointer</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="err">`</span><span·class="ss">perf</span><span·class="err">`</span><span·class="w">·</span><span·class="ss">support</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">enabled</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">otherwise</span><span·class="w">·</span><span·class="ss">this</span><span·class="w">
165 ·····</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">an</span><span·class="w">·</span><span·class="ss">optional</span><span·class="w">·</span><span·class="ss">save</span><span·class="w">·</span><span·class="ss">slot</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">stack</span><span·class="w">·</span><span·class="ss">pointer</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="ss">executing</span><span·class="w">·</span><span·class="n">C</span><span·class="w">165 ·····</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">an</span><span·class="w">·</span><span·class="ss">optional</span><span·class="w">·</span><span·class="ss">save</span><span·class="w">·</span><span·class="ss">slot</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">stack</span><span·class="w">·</span><span·class="ss">pointer</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="ss">executing</span><span·class="w">·</span><span·class="n">C</span><span·class="w">
166 ·····</span><span·class="ss">code</span><span·class="p">.</span><span·class="w">166 ·····</span><span·class="ss">code</span><span·class="p">.</span><span·class="w">
167 </span><span·class="nc">r12</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Active</span><span·class="w">·</span><span·class="ss">code</span><span·class="w">·</span><span·class="ss">index</span><span·class="w">167 </span><span·class="nc">r12</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Active</span><span·class="w">·</span><span·class="ss">code</span><span·class="w">·</span><span·class="ss">index</span><span·class="w">
168 </span><span·class="nc">r13</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Current</span><span·class="w">·</span><span·class="ss">running</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">168 </span><span·class="nc">r13</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Current</span><span·class="w">·</span><span·class="ss">running</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">
169 </span><span·class="nc">r14</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Remaining</span><span·class="w">·</span><span·class="ss">reductions</span><span·class="w">169 </span><span·class="nc">r14</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Remaining</span><span·class="w">·</span><span·class="ss">reductions</span><span·class="w">
170 </span><span·class="nc">r15</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">heap</span><span·class="w">·</span><span·class="ss">pointer</span></code></pre><p>Note·that·all·of·these·are·callee·save·registers·under·the·System·V·and·Windows170 </span><span·class="nc">r15</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">heap</span><span·class="w">·</span><span·class="ss">pointer</span></code></pre><p>Note·that·all·of·these·are·callee·save·registers·under·the·System·V·and·Windows
Offset 183, 21 lines modifiedOffset 183, 21 lines modified
183 shared·and·only·the·arguments·to·the·instructions·vary.·Using·as·little·memory·as183 shared·and·only·the·arguments·to·the·instructions·vary.·Using·as·little·memory·as
184 possible·has·many·advantages;·less·memory·is·used,·loading·time·decreases,184 possible·has·many·advantages;·less·memory·is·used,·loading·time·decreases,
185 higher·cache·hit-rate.</p><p>In·BeamAsm·we·need·to·achieve·something·similar·since·the·load-time·of·a·module185 higher·cache·hit-rate.</p><p>In·BeamAsm·we·need·to·achieve·something·similar·since·the·load-time·of·a·module
186 scales·almost·linearly·with·the·amount·of·memory·it·uses.·Early·BeamAsm·prototypes186 scales·almost·linearly·with·the·amount·of·memory·it·uses.·Early·BeamAsm·prototypes
187 used·about·double·the·amount·of·memory·for·code·as·the·interpreter,·while·current187 used·about·double·the·amount·of·memory·for·code·as·the·interpreter,·while·current
188 versions·use·about·10%·more.·How·was·this·achieved?</p><p>In·BeamAsm·we·heavily·use·shared·code·fragments·to·try·to·emit·as·much·code·as188 versions·use·about·10%·more.·How·was·this·achieved?</p><p>In·BeamAsm·we·heavily·use·shared·code·fragments·to·try·to·emit·as·much·code·as
189 possible·as·global·shared·fragments·instead·of·duplicating·the·code·unnecessarily.189 possible·as·global·shared·fragments·instead·of·duplicating·the·code·unnecessarily.
190 For·instance,·the·return·instruction·looks·something·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Label</span><span·class="w">·</span><span·class="ss">yield</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">newLabel</span><span·class="p"·data-group-id="6349904627-1">(</span><span·class="p"·data-group-id="6349904627-1">)</span><span·class="p">;</span><span·class="w">190 For·instance,·the·return·instruction·looks·something·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Label</span><span·class="w">·</span><span·class="ss">yield</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">newLabel</span><span·class="p"·data-group-id="1056583188-1">(</span><span·class="p"·data-group-id="1056583188-1">)</span><span·class="p">;</span><span·class="w">
  
191 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Decrement</span><span·class="w">·</span><span·class="ss">reduction</span><span·class="w">·</span><span·class="ss">counter</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">191 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Decrement</span><span·class="w">·</span><span·class="ss">reduction</span><span·class="w">·</span><span·class="ss">counter</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
192 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">dec</span><span·class="p"·data-group-id="6349904627-2">(</span><span·class="n">FCALLS</span><span·class="p"·data-group-id="6349904627-2">)</span><span·class="p">;</span><span·class="w">192 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">dec</span><span·class="p"·data-group-id="1056583188-2">(</span><span·class="n">FCALLS</span><span·class="p"·data-group-id="1056583188-2">)</span><span·class="p">;</span><span·class="w">
193 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">If</span><span·class="w">·</span><span·class="n">FCALLS</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">jump</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">yield</span><span·class="o">-</span><span·class="ss">on</span><span·class="o">-</span><span·class="ss">return</span><span·class="w">·</span><span·class="ss">fragment</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">193 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">If</span><span·class="w">·</span><span·class="n">FCALLS</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">jump</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">yield</span><span·class="o">-</span><span·class="ss">on</span><span·class="o">-</span><span·class="ss">return</span><span·class="w">·</span><span·class="ss">fragment</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
194 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">jl</span><span·class="p"·data-group-id="6349904627-3">(</span><span·class="nf">resolve_fragment</span><span·class="p"·data-group-id="6349904627-4">(</span><span·class="ss">ga</span><span·class="p">-&gt;</span><span·class="nf">get_dispatch_return</span><span·class="p"·data-group-id="6349904627-5"[·...·truncated·by·diffoscope;·len:·156,·SHA:·6271cb751d43c848db94c6fc41c73a2147c32d92dede9df9786e5b059e06c594·...·]-3">)</span><span·class="p">;</span><span·class="w">194 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">jl</span><span·class="p"·data-group-id="1056583188-3">(</span><span·class="nf">resolve_fragment</span><span·class="p"·data-group-id="1056583188-4">(</span><span·class="ss">ga</span><span·class="p">-&gt;</span><span·class="nf">get_dispatch_return</span><span·class="p"·data-group-id="1056583188-5"[·...·truncated·by·diffoscope;·len:·156,·SHA:·35366134fa744078f382df918cb7c4a07cfaaec181adca0055364107cf1c56bb·...·]-3">)</span><span·class="p">;</span><span·class="w">
195 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">ret</span><span·class="p"·data-group-id="6349904627-6">(</span><span·class="p"·data-group-id="6349904627-6">)</span><span·class="p">;</span></code></pre><p>The·code·above·is·not·exactly·what·is·emitted,·but·close·enough.·The·thing·to·note195 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">ret</span><span·class="p"·data-group-id="1056583188-6">(</span><span·class="p"·data-group-id="1056583188-6">)</span><span·class="p">;</span></code></pre><p>The·code·above·is·not·exactly·what·is·emitted,·but·close·enough.·The·thing·to·note
196 is·that·the·code·for·doing·the·context·switch·is·never·emitted.·Instead,·we·jump196 is·that·the·code·for·doing·the·context·switch·is·never·emitted.·Instead,·we·jump
197 to·a·global·fragment·that·all·return·instructions·share.·This·greatly·reduces197 to·a·global·fragment·that·all·return·instructions·share.·This·greatly·reduces
198 the·amount·of·code·that·has·to·be·emitted·for·each·module.</p><h2·id="running-erlang-code"·class="section-heading">198 the·amount·of·code·that·has·to·be·emitted·for·each·module.</p><h2·id="running-erlang-code"·class="section-heading">
199 ··<a·href="#running-erlang-code"·class="hover-link">199 ··<a·href="#running-erlang-code"·class="hover-link">
200 ····<i·class="ri-link-m"·aria-hidden="true"></i>200 ····<i·class="ri-link-m"·aria-hidden="true"></i>
201 ··</a>201 ··</a>
202 ··<span·class="text">Running·Erlang·code</span>202 ··<span·class="text">Running·Erlang·code</span>
Offset 239, 43 lines modifiedOffset 239, 43 lines modified
239 ··<a·href="#running-c-code"·class="hover-link">239 ··<a·href="#running-c-code"·class="hover-link">
240 ····<i·class="ri-link-m"·aria-hidden="true"></i>240 ····<i·class="ri-link-m"·aria-hidden="true"></i>
241 ··</a>241 ··</a>
242 ··<span·class="text">Running·C·code</span>242 ··<span·class="text">Running·C·code</span>
243 </h2>243 </h2>
244 <p>As·Erlang·stacks·can·be·very·small,·we·have·to·switch·over·to·a·different·stack244 <p>As·Erlang·stacks·can·be·very·small,·we·have·to·switch·over·to·a·different·stack
245 when·we·need·to·execute·C·code·(which·may·expect·a·much·larger·stack).·This·is245 when·we·need·to·execute·C·code·(which·may·expect·a·much·larger·stack).·This·is
246 done·through·<code·class="inline">emit_enter_runtime</code>·and·<code·class="inline">emit_leave_runtime</code>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">mov_arg</span><span·class="p"·data-group-id="2491416635-1">(</span><span·class="n">ARG4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NumFree</span><span·class="p"·data-group-id="2491416635-1">)</span><span·class="p">;</span><span·class="w">246 done·through·<code·class="inline">emit_enter_runtime</code>·and·<code·class="inline">emit_leave_runtime</code>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">mov_arg</span><span·class="p"·data-group-id="0910838121-1">(</span><span·class="n">ARG4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NumFree</span><span·class="p"·data-group-id="0910838121-1">)</span><span·class="p">;</span><span·class="w">
  
247 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Move</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="ss">stack</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="ss">swap</span><span·class="w">·</span><span·class="ss">out</span><span·class="w">·</span><span·class="ss">our</span><span·class="w">·</span><span·class="ss">current</span><span·class="w">·</span><span·class="ss">reductions</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stack</span><span·class="o">-</span><span·class="p">,</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">247 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Move</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="ss">stack</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="ss">swap</span><span·class="w">·</span><span·class="ss">out</span><span·class="w">·</span><span·class="ss">our</span><span·class="w">·</span><span·class="ss">current</span><span·class="w">·</span><span·class="ss">reductions</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stack</span><span·class="o">-</span><span·class="p">,</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">
248 ·</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">heap</span><span·class="w">·</span><span·class="ss">pointer</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">·</span><span·class="ss">structure</span><span·class="p">.</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">248 ·</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">heap</span><span·class="w">·</span><span·class="ss">pointer</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">·</span><span·class="ss">structure</span><span·class="p">.</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
249 </span><span·class="ss">emit_enter_runtime</span><span·class="o">&lt;</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eReductions</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eStack</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eHeap</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2491416635-2">(</span><span·class="p"·data-group-id="2491416635-2">)</span><span·class="p">;</span><span·class="w">249 </span><span·class="ss">emit_enter_runtime</span><span·class="o">&lt;</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eReductions</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eStack</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eHeap</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0910838121-2">(</span><span·class="p"·data-group-id="0910838121-2">)</span><span·class="p">;</span><span·class="w">
  
250 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">mov</span><span·class="p"·data-group-id="2491416635-3">(</span><span·class="n">ARG1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c_p</span><span·class="p"·data-group-id="2491416635-3">)</span><span·class="p">;</span><span·class="w">250 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">mov</span><span·class="p"·data-group-id="0910838121-3">(</span><span·class="n">ARG1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c_p</span><span·class="p"·data-group-id="0910838121-3">)</span><span·class="p">;</span><span·class="w">
251 </span><span·class="nf">load_x_reg_array</span><span·class="p"·data-group-id="2491416635-4">(</span><span·class="n">ARG2</span><span·class="p"·data-group-id="2491416635-4">)</span><span·class="p">;</span><span·class="w">251 </span><span·class="nf">load_x_reg_array</span><span·class="p"·data-group-id="0910838121-4">(</span><span·class="n">ARG2</span><span·class="p"·data-group-id="0910838121-4">)</span><span·class="p">;</span><span·class="w">
252 </span><span·class="nf">make_move_patch</span><span·class="p"·data-group-id="2491416635-5">(</span><span·class="n">ARG3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">lambdas</span><span·class="p"·data-group-id="2491416635-6">[</span><span·class="n">Fun</span><span·class="p">.</span><span·class="nf">getValue[·...·truncated·by·diffoscope;·len:·262,·SHA:·36023e493653c34131c907b0f5b7b531b95ab687446c37f0a99d0aac05fa906f·...·]-5">)</span><span·class="p">;</span><span·class="w">252 </span><span·class="nf">make_move_patch</span><span·class="p"·data-group-id="0910838121-5">(</span><span·class="n">ARG3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">lambdas</span><span·class="p"·data-group-id="0910838121-6">[</span><span·class="n">Fun</span><span·class="p">.</span><span·class="nf">getValue[·...·truncated·by·diffoscope;·len:·262,·SHA:·6a0a5e1cc7a723afdbfda216cbfb485e480d9be5b3ef6a10b79a723dfc446b89·...·]-5">)</span><span·class="p">;</span><span·class="w">
  
253 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Call</span><span·class="w">·</span><span·class="err">`</span><span·class="ss">new_fun</span><span·class="err">`</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">asserting</span><span·class="w">·</span><span·class="ss">that</span><span·class="w">·</span><span·class="ss">we</span><span·class="err">&#39;</span><span·class="ss">re</span><span·class="w">·</span><span·class="ss">on</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="ss">stack</span><span·class="p">.</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">253 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Call</span><span·class="w">·</span><span·class="err">`</span><span·class="ss">new_fun</span><span·class="err">`</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">asserting</span><span·class="w">·</span><span·class="ss">that</span><span·class="w">·</span><span·class="ss">we</span><span·class="err">&#39;</span><span·class="ss">re</span><span·class="w">·</span><span·class="ss">on</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="ss">stack</span><span·class="p">.</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
254 </span><span·class="ss">runtime_call</span><span·class="o">&lt;</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2491416635-8">(</span><span·class="ss">new_fun</span><span·class="p"·data-group-id="2491416635-8">)</span><span·class="p">;</span><span·class="w">254 </span><span·class="ss">runtime_call</span><span·class="o">&lt;</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0910838121-8">(</span><span·class="ss">new_fun</span><span·class="p"·data-group-id="0910838121-8">)</span><span·class="p">;</span><span·class="w">
  
255 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Move</span><span·class="w">·</span><span·class="ss">back</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="ss">stack</span><span·class="p">,</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="ss">read</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">updated</span><span·class="w">·</span><span·class="ss">values</span><span·class="w">·</span><span·class="ss">from</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">255 </span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Move</span><span·class="w">·</span><span·class="ss">back</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">C</span><span·class="w">·</span><span·class="ss">stack</span><span·class="p">,</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="ss">read</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">updated</span><span·class="w">·</span><span·class="ss">values</span><span·class="w">·</span><span·class="ss">from</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">
256 ·</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">structure</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">256 ·</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">structure</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
257 </span><span·class="ss">emit_leave_runtime</span><span·class="o">&lt;</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eReductions</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eStack</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eHeap</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2491416635-9">(</span><span·class="p"·data-group-id="2491416635-9">)</span><span·class="p">;</span><span·class="w">257 </span><span·class="ss">emit_leave_runtime</span><span·class="o">&lt;</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eReductions</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eStack</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Update</span><span·class="p">:</span><span·class="p">:</span><span·class="ss">eHeap</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0910838121-9">(</span><span·class="p"·data-group-id="0910838121-9">)</span><span·class="p">;</span><span·class="w">
  
258 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">mov</span><span·class="p"·data-group-id="2491416635-10">(</span><span·class="nf">getXRef</span><span·class="p"·data-group-id="2491416635-11">(</span><span·class="mi">0</span><span·class="p"·data-group-id="2491416635-11">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RET</[·...·truncated·by·diffoscope;·len:·46,·SHA:·4d4987c0f744c9fed67cb52145d0a9ca7bf42af02a2a4c7c45d6e7d8e0bc11b4·...·]-10">)</span><span·class="p">;</span></code></pre><p>All·combinations·of·the·<code·class="inline">Update</code>·constants·are·legal,·but·the·ones·given·to258 </span><span·class="ss">a</span><span·class="p">.</span><span·class="nf">mov</span><span·class="p"·data-group-id="0910838121-10">(</span><span·class="nf">getXRef</span><span·class="p"·data-group-id="0910838121-11">(</span><span·class="mi">0</span><span·class="p"·data-group-id="0910838121-11">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RET</[·...·truncated·by·diffoscope;·len:·46,·SHA:·bdeedc1413ed677910794b2d89ee9b9dc1079cbded7367b3f3ecf7f96c06f42a·...·]-10">)</span><span·class="p">;</span></code></pre><p>All·combinations·of·the·<code·class="inline">Update</code>·constants·are·legal,·but·the·ones·given·to
259 <code·class="inline">emit_leave_runtime</code>·<em>must</em>·be·the·same·as·those·given·to·<code·class="inline">emit_enter_runtime</code>.</p><h2·id="tracing-and-nif-loading"·class="section-heading">259 <code·class="inline">emit_leave_runtime</code>·<em>must</em>·be·the·same·as·those·given·to·<code·class="inline">emit_enter_runtime</code>.</p><h2·id="tracing-and-nif-loading"·class="section-heading">
260 ··<a·href="#tracing-and-nif-loading"·class="hover-link">260 ··<a·href="#tracing-and-nif-loading"·class="hover-link">
261 ····<i·class="ri-link-m"·aria-hidden="true"></i>261 ····<i·class="ri-link-m"·aria-hidden="true"></i>
262 ··</a>262 ··</a>
263 ··<span·class="text">Tracing·and·NIF·Loading</span>263 ··<span·class="text">Tracing·and·NIF·Loading</span>
264 </h2>264 </h2>
265 <p>To·make·tracing·and·NIF·loading·work·there·needs·to·be·a·way·to·intercept265 <p>To·make·tracing·and·NIF·loading·work·there·needs·to·be·a·way·to·intercept
266 any·function·call.·In·the·interpreter,·this·is·done·by·rewriting·the·loaded266 any·function·call.·In·the·interpreter,·this·is·done·by·rewriting·the·loaded
267 BEAM·code,·but·this·is·more·complicated·in·BeamAsm·as·we·want·to·have·a·fast267 BEAM·code,·but·this·is·more·complicated·in·BeamAsm·as·we·want·to·have·a·fast
268 and·compact·way·to·do·this.·This·is·solved·by·emitting·the·code·below·at·the268 and·compact·way·to·do·this.·This·is·solved·by·emitting·the·code·below·at·the
269 start·of·each·function·(x86·variant·below):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">0</span><span·class="nc">x0</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">short</span><span·class="w">·</span><span·class="ss">jmp</span><span·class="w">·</span><span·class="mi">6</span><span·class="w">·</span><span·class="p"·data-group-id="4927302609-1">(</span><span·class="ss">address</span><span·class="w">·</span><span·class="mi">0</span><span·class="ss">x8</span><span·class="p"·data-group-id="4927302609-1">)</span><span·class="w">269 start·of·each·function·(x86·variant·below):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">0</span><span·class="nc">x0</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">short</span><span·class="w">·</span><span·class="ss">jmp</span><span·class="w">·</span><span·class="mi">6</span><span·class="w">·</span><span·class="p"·data-group-id="6569904485-1">(</span><span·class="ss">address</span><span·class="w">·</span><span·class="mi">0</span><span·class="ss">x8</span><span·class="p"·data-group-id="6569904485-1">)</span><span·class="w">
270 ··</span><span·class="mi">0</span><span·class="nc">x2</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nop</span><span·class="w">270 ··</span><span·class="mi">0</span><span·class="nc">x2</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nop</span><span·class="w">
271 ··</span><span·class="mi">0</span><span·class="nc">x3</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">relative</span><span·class="w">·</span><span·class="ss">near</span><span·class="w">·</span><span·class="ss">call</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">shared</span><span·class="w">·</span><span·class="ss">breakpoint</span><span·class="w">·</span><span·class="ss">fragment</span><span·class="w">271 ··</span><span·class="mi">0</span><span·class="nc">x3</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">relative</span><span·class="w">·</span><span·class="ss">near</span><span·class="w">·</span><span·class="ss">call</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">shared</span><span·class="w">·</span><span·class="ss">breakpoint</span><span·class="w">·</span><span·class="ss">fragment</span><span·class="w">
272 ··</span><span·class="mi">0</span><span·class="nc">x8</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">actual</span><span·class="w">·</span><span·class="ss">code</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">function</span></code></pre><p>When·code·starts·to·execute·it·will·simply·see·the·<code·class="inline">short·jmp·6</code>·instruction272 ··</span><span·class="mi">0</span><span·class="nc">x8</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">actual</span><span·class="w">·</span><span·class="ss">code</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">function</span></code></pre><p>When·code·starts·to·execute·it·will·simply·see·the·<code·class="inline">short·jmp·6</code>·instruction
273 which·skips·the·prologue·and·starts·to·execute·the·code·directly.</p><p>When·we·want·to·enable·a·certain·breakpoint·we·set·the·jmp·target·to·be·1,273 which·skips·the·prologue·and·starts·to·execute·the·code·directly.</p><p>When·we·want·to·enable·a·certain·breakpoint·we·set·the·jmp·target·to·be·1,
274 which·means·it·will·land·on·the·call·to·the·shared·breakpoint·fragment.·This274 which·means·it·will·land·on·the·call·to·the·shared·breakpoint·fragment.·This
275 fragment·checks·the·current·<code·class="inline">breakpoint_flag</code>·stored·in·the·ErtsCodeInfo·of275 fragment·checks·the·current·<code·class="inline">breakpoint_flag</code>·stored·in·the·ErtsCodeInfo·of
276 this·function,·and·then·calls·<code·class="inline">erts_call_nif_early</code>·and276 this·function,·and·then·calls·<code·class="inline">erts_call_nif_early</code>·and
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289 ··<span·class="text">Updating·code</span>289 ··<span·class="text">Updating·code</span>
290 </h3>290 </h3>
291 <p>Because·many·environments·enforce·<a·href="https://en.wikipedia.org/wiki/W%5EX"·title="">W^X</a>·it's·not·always·possible·to·write291 <p>Because·many·environments·enforce·<a·href="https://en.wikipedia.org/wiki/W%5EX"·title="">W^X</a>·it's·not·always·possible·to·write
292 directly·to·the·code·pages.·Because·of·this·we·map·code·twice:·once·with·an292 directly·to·the·code·pages.·Because·of·this·we·map·code·twice:·once·with·an
293 executable·page·and·once·with·a·writable·page.·Since·they're·backed·by·the293 executable·page·and·once·with·a·writable·page.·Since·they're·backed·by·the
294 same·memory,·writes·to·the·writable·page·appear·magically·in·the·executable294 same·memory,·writes·to·the·writable·page·appear·magically·in·the·executable
295 one.</p><p>The·<code·class="inline">erts_writable_code_ptr</code>·function·can·be·used·to·get·writable·pointers295 one.</p><p>The·<code·class="inline">erts_writable_code_ptr</code>·function·can·be·used·to·get·writable·pointers
296 given·a·module·instance,·provided·that·it·has·been·unsealed·first:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">for</span><span·class="w">·</span><span·class="p"·data-group-id="1290344518-1">(</span><span·class="ss">i</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">;</span><span·class="w">·</span><span·class="ss">i</span><span·class="w">·</span><span·class="o"[·...·truncated·by·diffoscope;·len:·277,·SHA:·322e067487b6394b5349967b1c0df554c85a3a004945495d39b8741ee5250787·...·]-2">{</span><span·class="w">296 given·a·module·instance,·provided·that·it·has·been·unsealed·first:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">for</span><span·class="w">·</span><span·class="p"·data-group-id="5384925245-1">(</span><span·class="ss">i</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">;</span><span·class="w">·</span><span·class="ss">i</span><span·class="w">·</span><span·class="o"[·...·truncated·by·diffoscope;·len:·277,·SHA:·56419ed940c3b3e065a5adb370c872cad268e3c514507a7a3b94802a1f1f5c6c·...·]-2">{</span><span·class="w">
297 ····</span><span·class="ss">const</span><span·class="w">·</span><span·class="n">ErtsCodeInfo</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">ci_exec</span><span·class="p">;</span><span·class="w">297 ····</span><span·class="ss">const</span><span·class="w">·</span><span·class="n">ErtsCodeInfo</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">ci_exec</span><span·class="p">;</span><span·class="w">
298 ····</span><span·class="n">ErtsCodeInfo</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">ci_rw</span><span·class="p">;</span><span·class="w">298 ····</span><span·class="n">ErtsCodeInfo</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">ci_rw</span><span·class="p">;</span><span·class="w">
299 ····</span><span·class="ss">void</span><span·class="w">·</span><span·class="o">*</span><span·class="ss">w_ptr</span><span·class="p">;</span><span·class="w">299 ····</span><span·class="ss">void</span><span·class="w">·</span><span·class="o">*</span><span·class="ss">w_ptr</span><span·class="p">;</span><span·class="w">
  
300 ····</span><span·class="nf">erts_unseal_module</span><span·class="p"·data-group-id="1290344518-3">(</span><span·class="err">&amp;</span><span·class="ss">modp</span><span·class="p">-&gt;</span><span·class="ss">curr</span><span·class="p"·data-group-id="1290344518-3">)</span><span·class="p">;</span><span·class="w">300 ····</span><span·class="nf">erts_unseal_module</span><span·class="p"·data-group-id="5384925245-3">(</span><span·class="err">&amp;</span><span·class="ss">modp</span><span·class="p">-&gt;</span><span·class="ss">curr</span><span·class="p"·data-group-id="5384925245-3">)</span><span·class="p">;</span><span·class="w">
  
301 ····</span><span·class="ss">ci_exec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">code_hdr</span><span·class="p">-&gt;</span><span·class="ss">functions</span><span·class="p"·data-group-id="1290344518-4">[</span><span·class="ss">i</span><span·class="p"·data-group-id="1290344518-4">]</span><span·class="p">;</span><span·class="w">301 ····</span><span·class="ss">ci_exec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">code_hdr</span><span·class="p">-&gt;</span><span·class="ss">functions</span><span·class="p"·data-group-id="5384925245-4">[</span><span·class="ss">i</span><span·class="p"·data-group-id="5384925245-4">]</span><span·class="p">;</span><span·class="w">
302 ····</span><span·class="ss">w_ptr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">erts_writable_code_ptr</span><span·class="p"·data-group-id="1290344518-5">(</span><span·class="err">&amp;</span><span·class="ss">modp</span><span·class="p">-&gt;</span><span·class="ss">curr</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ci_exec</span><span·class="p"·data-group-id="1290344518-5">)</span><span·class="p">;</span><span·class="w">302 ····</span><span·class="ss">w_ptr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">erts_writable_code_ptr</span><span·class="p"·data-group-id="5384925245-5">(</span><span·class="err">&amp;</span><span·class="ss">modp</span><span·class="p">-&gt;</span><span·class="ss">curr</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ci_exec</span><span·class="p"·data-group-id="5384925245-5">)</span><span·class="p">;</span><span·class="w">
303 ····</span><span·class="ss">ci_rw</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1290344518-6">(</span><span·class="n">ErtsCodeInfo</span><span·class="o">*</span><span·class="p"·data-group-id="1290344518-6">)</span><span·class="ss">w_ptr</span><span·class="p">;</span><span·class="w">303 ····</span><span·class="ss">ci_rw</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5384925245-6">(</span><span·class="n">ErtsCodeInfo</span><span·class="o">*</span><span·class="p"·data-group-id="5384925245-6">)</span><span·class="ss">w_ptr</span><span·class="p">;</span><span·class="w">
  
304 ····</span><span·class="nf">uninstall_breakpoint</span><span·class="p"·data-group-id="1290344518-7">(</span><span·class="ss">ci_rw</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ci_exec</span><span·class="p"·data-group-id="1290344518-7">)</span><span·class="p">;</span><span·class="w">304 ····</span><span·class="nf">uninstall_breakpoint</span><span·class="p"·data-group-id="5384925245-7">(</span><span·class="ss">ci_rw</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ci_exec</span><span·class="p"·data-group-id="5384925245-7">)</span><span·class="p">;</span><span·class="w">
305 ····</span><span·class="nf">consolidate_bp_data</span><span·class="p"·data-group-id="1290344518-8">(</span><span·class="ss">modp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ci_rw</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="1290344518-8">)</span><span·class="p">;</span><span·class="w">305 ····</span><span·class="nf">consolidate_bp_data</span><span·class="p"·data-group-id="5384925245-8">(</span><span·class="ss">modp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ci_rw</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5384925245-8">)</span><span·class="p">;</span><span·class="w">
306 ····</span><span·class="n">ASSERT</span><span·class="p"·data-group-id="1290344518-9">(</span><span·class="ss">ci_rw</span><span·class="p">-&gt;</span><span·class="ss">gen_bp</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">NULL</span><span·class="p"·data-group-id="1290344518-9">)</span><span·class="p">;</span><span·class="w">306 ····</span><span·class="n">ASSERT</span><span·class="p"·data-group-id="5384925245-9">(</span><span·class="ss">ci_rw</span><span·class="p">-&gt;</span><span·class="ss">gen_bp</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">NULL</span><span·class="p"·data-group-id="5384925245-9">)</span><span·class="p">;</span><span·class="w">
  
307 ····</span><span·class="nf">erts_seal_module</span><span·class="p"·data-group-id="1290344518-10">(</span><span·class="err">&amp;</span><span·class="ss">modp</span><span·class="p">-&gt;</span><span·class="ss">curr</span><span·class="p"·data-group-id="1290344518-10">)</span><span·class="p">;</span><span·class="w">307 ····</span><span·class="nf">erts_seal_module</span><span·class="p"·data-group-id="5384925245-10">(</span><span·class="err">&amp;</span><span·class="ss">modp</span><span·class="p">-&gt;</span><span·class="ss">curr</span><span·class="p"·data-group-id="5384925245-10">)</span><span·class="p">;</span><span·class="w">
308 </span><span·class="p"·data-group-id="1290344518-2">}</span></code></pre><p>Without·the·module·instance·there's·no·reliable·way·to·figure·out·the·writable308 </span><span·class="p"·data-group-id="5384925245-2">}</span></code></pre><p>Without·the·module·instance·there's·no·reliable·way·to·figure·out·the·writable
309 address·of·a·code·page,·and·we·rely·on·<em>address·space·layout·randomization</em>309 address·of·a·code·page,·and·we·rely·on·<em>address·space·layout·randomization</em>
310 (ASLR)·to·make·it·difficult·to·guess.·On·some·platforms,·security·is·further310 (ASLR)·to·make·it·difficult·to·guess.·On·some·platforms,·security·is·further
311 enhanced·by·protecting·the·writable·area·from·writes·until·the·module·has·been311 enhanced·by·protecting·the·writable·area·from·writes·until·the·module·has·been
312 unsealed·by·<code·class="inline">erts_unseal_module</code>.</p><h3·id="export-tracing"·class="section-heading">312 unsealed·by·<code·class="inline">erts_unseal_module</code>.</p><h3·id="export-tracing"·class="section-heading">
313 ··<a·href="#export-tracing"·class="hover-link">313 ··<a·href="#export-tracing"·class="hover-link">
314 ····<i·class="ri-link-m"·aria-hidden="true"></i>314 ····<i·class="ri-link-m"·aria-hidden="true"></i>
315 ··</a>315 ··</a>
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393 </span><span·class="ss">perf</span><span·class="w">·</span><span·class="ss">script</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">out</span><span·class="p">.</span><span·class="ss">perf</span><span·class="w">393 </span><span·class="ss">perf</span><span·class="w">·</span><span·class="ss">script</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">out</span><span·class="p">.</span><span·class="ss">perf</span><span·class="w">
394 </span><span·class="p">#</span><span·class="p">#</span><span·class="w">·</span><span·class="ss">run</span><span·class="w">·</span><span·class="ss">stackcollapse</span><span·class="w">394 </span><span·class="p">#</span><span·class="p">#</span><span·class="w">·</span><span·class="ss">run</span><span·class="w">·</span><span·class="ss">stackcollapse</span><span·class="w">
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408 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>408 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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163 only·be·done·by·one·loader·process·at·a·time.·A·second·loader·process163 only·be·done·by·one·loader·process·at·a·time.·A·second·loader·process
164 trying·to·enter·finishing·phase·will·be·suspended·until·the·first164 trying·to·enter·finishing·phase·will·be·suspended·until·the·first
165 loader·is·done.·This·will·only·block·the·process,·the·scheduler·is165 loader·is·done.·This·will·only·block·the·process,·the·scheduler·is
166 free·to·schedule·other·work·while·the·second·loader·is·waiting.·(See166 free·to·schedule·other·work·while·the·second·loader·is·waiting.·(See
167 <code·class="inline">erts_try_seize_code_load_permission</code>·and167 <code·class="inline">erts_try_seize_code_load_permission</code>·and
168 <code·class="inline">erts_release_code_load_permission</code>).</p><p>The·ability·to·prepare·several·modules·in·parallel·is·not·currently168 <code·class="inline">erts_release_code_load_permission</code>).</p><p>The·ability·to·prepare·several·modules·in·parallel·is·not·currently
169 used·as·almost·all·code·loading·is·serialized·by·the·code_server169 used·as·almost·all·code·loading·is·serialized·by·the·code_server
170 process.·The·BIF·interface·is·however·prepared·for·this.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">prepare_loading</span><span·class="p"·data-group-id="9516715454-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Code</span><span·class="p"·data-group-id="9516715454-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">LoaderState</span><span·class="w"> 
171 ··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">finish_loading</span><span·class="p"·data-group-id="9516715454-2">(</span><span·class="p"·data-group-id="9516715454-3">[</span><span·class="n">LoaderState</span><span·class="p"[·...·truncated·by·diffoscope;·len:·199,·SHA:·10d57cc8c9b2c7252d2373611ed55fae19403366ec33a58f64f28cfb54c781c8·...·]170 process.·The·BIF·interface·is·however·prepared·for·this.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">prepare_loading</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·306,·SHA:·e922d14161a7e50f5f3118d3efec75f64a29b0590ead1ae21b6bd650a7ecae62·...·]
 171 ··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">finish_loading</span><span·class="p"·data-group-id="4366307959-2">(</span><span·class="p"·data-group-id="4366307959-3">[</span><span·class="n">LoaderState</span><span·class="p"·data-group-id="4366307959-3">]</span><span·class="p"·data-group-id="4366307959-2">)</span></code></pre><p>The·idea·is·that·<code·class="inline">prepare_loading</code>·could·be·called·in·parallel·for
172 different·modules·and·returns·a·&quot;magic·binary&quot;·containing·the·internal172 different·modules·and·returns·a·&quot;magic·binary&quot;·containing·the·internal
173 state·of·each·prepared·module.·Function·<code·class="inline">finish_loading</code>·could·take·a173 state·of·each·prepared·module.·Function·<code·class="inline">finish_loading</code>·could·take·a
174 list·of·such·states·and·do·the·finishing·of·all·of·them·in·one·go.</p><p>Currently·we·use·the·legacy·BIF·<code·class="inline">erlang:load_module</code>·which·is·now174 list·of·such·states·and·do·the·finishing·of·all·of·them·in·one·go.</p><p>Currently·we·use·the·legacy·BIF·<code·class="inline">erlang:load_module</code>·which·is·now
175 implemented·in·Erlang·by·calling·the·above·two·functions·in175 implemented·in·Erlang·by·calling·the·above·two·functions·in
176 sequence.·Function·<code·class="inline">finish_loading</code>·is·limited·to·only·accepts·a·list176 sequence.·Function·<code·class="inline">finish_loading</code>·is·limited·to·only·accepts·a·list
177 with·one·module·state·as·we·do·not·yet·use·the·multi·module·loading177 with·one·module·state·as·we·do·not·yet·use·the·multi·module·loading
178 feature.</p><h2·id="the-finishing-sequence"·class="section-heading">178 feature.</p><h2·id="the-finishing-sequence"·class="section-heading">
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319 ······</p>319 ······</p>
320 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>320 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
321 ····</footer>321 ····</footer>
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323 </main>323 </main>
324 </div>324 </div>
325 <script>325 <script>
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203 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>203 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
204 ····</footer>204 ····</footer>
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208 <script>208 <script>
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500 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>500 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
501 ····</footer>501 ····</footer>
502 ··</div>502 ··</div>
503 </main>503 </main>
504 </div>504 </div>
505 <script>505 <script>
506 ··function·mermaidLoaded()·{506 ··function·mermaidLoaded()·{
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221 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>221 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
222 ····</footer>222 ····</footer>
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224 </main>224 </main>
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226 <script>226 <script>
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401 <a·href="erlang.html#put/2"><code·class="inline">put/2</code></a>·and·<a·href="erlang.html#get/1"><code·class="inline">get/1</code></a>·thing)·is·non-empty.</p><p>The·raw·memory·information·can·be·decoded·by·the·Crashdump·Viewer·tool.·You·can401 <a·href="erlang.html#put/2"><code·class="inline">put/2</code></a>·and·<a·href="erlang.html#get/1"><code·class="inline">get/1</code></a>·thing)·is·non-empty.</p><p>The·raw·memory·information·can·be·decoded·by·the·Crashdump·Viewer·tool.·You·can
402 then·see·the·stack·dump,·the·message·queue·(if·any),·and·the·dictionary·(if402 then·see·the·stack·dump,·the·message·queue·(if·any),·and·the·dictionary·(if
403 any).</p><p>The·stack·dump·is·a·dump·of·the·Erlang·process·stack.·Most·of·the·live·data403 any).</p><p>The·stack·dump·is·a·dump·of·the·Erlang·process·stack.·Most·of·the·live·data
404 (that·is,·variables·currently·in·use)·are·placed·on·the·stack;·thus·this·can·be404 (that·is,·variables·currently·in·use)·are·placed·on·the·stack;·thus·this·can·be
405 interesting.·One·has·to·&quot;guess&quot;·what·is·what,·but·as·the·information·is405 interesting.·One·has·to·&quot;guess&quot;·what·is·what,·but·as·the·information·is
406 symbolic,·thorough·reading·of·this·information·can·be·useful.·As·an·example,·we406 symbolic,·thorough·reading·of·this·information·can·be·useful.·As·an·example,·we
407 can·find·the·state·variable·of·the·Erlang·primitive·loader·online·<code·class="inline">(5)</code>·and407 can·find·the·state·variable·of·the·Erlang·primitive·loader·online·<code·class="inline">(5)</code>·and
408 <code·class="inline">(6)</code>·in·the·following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7472716737-1">(</span><span·class="mi">1</span><span·class="p"·data-group-id="7472716737-1">)</span><span·class="w">··</span><span·class="mi">3</span><span·class="ss">cac44</span><span·class="w">···</span><span·class="n">Return</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·426,·SHA:·9b8e5602b9b9e875aea93f73dddcedb18766c1f6d00ea52ae979c4a5631e0e8f·...·]-2">)</span><span·class="w">408 <code·class="inline">(6)</code>·in·the·following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8300663893-1">(</span><span·class="mi">1</span><span·class="p"·data-group-id="8300663893-1">)</span><span·class="w">··</span><span·class="mi">3</span><span·class="ss">cac44</span><span·class="w">···</span><span·class="n">Return</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·426,·SHA:·733ae55fb375a32bb53e7cbfbb96e25a47eb70a14517715261edd35ae143f3ac·...·]-2">)</span><span·class="w">
409 </span><span·class="p"·data-group-id="7472716737-3">(</span><span·class="mi">2</span><span·class="p"·data-group-id="7472716737-3">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="7472716737-4">(</span><span·class="mi">0</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·94,·SHA:·9616e0e15311dd44fc8f806f87365901e637406dcdc4da03bbf3a1a3ed2ae1da·...·]-5">[</span><span·class="s">&quot;/view/siri_r10_dev/clearcase/otp/erts/lib/kernel/ebin&quot;</span><span·class="p">,</span><span·class="w">409 </span><span·class="p"·data-group-id="8300663893-3">(</span><span·class="mi">2</span><span·class="p"·data-group-id="8300663893-3">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="8300663893-4">(</span><span·class="mi">0</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·94,·SHA:·373346e1d384b92000cc8ca968929bf28cbeec1808dc69a01d23a983a58dc481·...·]-5">[</span><span·class="s">&quot;/view/siri_r10_dev/clearcase/otp/erts/lib/kernel/ebin&quot;</span><span·class="p">,</span><span·class="w">
410 </span><span·class="p"·data-group-id="7472716737-6">(</span><span·class="mi">3</span><span·class="p"·data-group-id="7472716737-6">)</span><span·class="w">············</span><span·class="s">&quot;/view/siri_r10_dev/clearcase/otp/erts/lib/stdlib/ebin&quot;</span><span·class="p"·data-group-id="74[·...·truncated·by·diffoscope;·len:·8,·SHA:·f6130d0fb3ede80feb92a20bcffb3bacedc0599f572de6b759c1190576c45e0d·...·]-5">]</span><span·class="w">410 </span><span·class="p"·data-group-id="8300663893-6">(</span><span·class="mi">3</span><span·class="p"·data-group-id="8300663893-6">)</span><span·class="w">············</span><span·class="s">&quot;/view/siri_r10_dev/clearcase/otp/erts/lib/stdlib/ebin&quot;</span><span·class="p"·data-group-id="83[·...·truncated·by·diffoscope;·len:·8,·SHA:·a8e8e208518687db5617ca27ae5e2ddf6fe275f62528c1f7898487f6068a31c5·...·]-5">]</span><span·class="w">
411 </span><span·class="p"·data-group-id="7472716737-7">(</span><span·class="mi">4</span><span·class="p"·data-group-id="7472716737-7">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="7472716737-8">(</span><span·class="mi">1</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·3aea511195b8db5c2d3a799ccbd5b5eabc7d6be751a60fea489119cf731cba56·...·]-8">)</span><span·class="w">·····</span><span·class="o">&lt;</span><span·class="mf">0.1</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">411 </span><span·class="p"·data-group-id="8300663893-7">(</span><span·class="mi">4</span><span·class="p"·data-group-id="8300663893-7">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="8300663893-8">(</span><span·class="mi">1</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·ebb8b93cdd6942e47b126c9230422630f642ac99c5aafbf3cf9a8c0d30f3d903·...·]-8">)</span><span·class="w">·····</span><span·class="o">&lt;</span><span·class="mf">0.1</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">
412 </span><span·class="p"·data-group-id="7472716737-9">(</span><span·class="mi">5</span><span·class="p"·data-group-id="7472716737-9">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="7472716737-10">(</span><span·class="mi">2</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·257,·SHA:·7bbc5a54d21178a7fef0db23d5765a06d8ab326fe5e4e39829c0d8738001b0a7·...·]-12">]</span><span·class="p">,</span><span·class="ss">none</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_prim_loader</span><span·class="p">.</span><span·class="mf">6.7085890</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_prim_loader</span><span·class="p">.</span><span·class="mf">7.9000327</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">412 </span><span·class="p"·data-group-id="8300663893-9">(</span><span·class="mi">5</span><span·class="p"·data-group-id="8300663893-9">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="8300663893-10">(</span><span·class="mi">2</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·257,·SHA:·b1d59131121e386feeedb5db5c1d735a9642bd1a75971a7f7d6b78956a2501a4·...·]-12">]</span><span·class="p">,</span><span·class="ss">none</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_prim_loader</span><span·class="p">.</span><span·class="mf">6.7085890</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_prim_loader</span><span·class="p">.</span><span·class="mf">7.9000327</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">
413 </span><span·class="p"·data-group-id="7472716737-13">(</span><span·class="mi">6</span><span·class="p"·data-group-id="7472716737-13">)</span><span·class="w">············</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_prim_loader</span><sp[·...·truncated·by·diffoscope;·len:·561,·SHA:·411fd2d299623516b042cde32a809d8bd4ded252fb8c143d41925f476247f9e5·...·]-11">}</span><span·class="w">413 </span><span·class="p"·data-group-id="8300663893-13">(</span><span·class="mi">6</span><span·class="p"·data-group-id="8300663893-13">)</span><span·class="w">············</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_prim_loader</span><sp[·...·truncated·by·diffoscope;·len:·561,·SHA:·a6d8a44c4756d647eba2d01b51c3d5911047793a00fd577a2f59abece5a53108·...·]-11">}</span><span·class="w">
414 </span><span·class="p"·data-group-id="7472716737-14">(</span><span·class="mi">7</span><span·class="p"·data-group-id="7472716737-14">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="7472716737-15">(</span><span·class="mi">3</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·b17d6d474d7f2d695a9ceef1af05d07aca1e3844bb3f9894261c8c08aa8f5efc·...·]-15">)</span><span·class="w">·····</span><span·class="ss">infinity</span></code></pre><p>When·interpreting·the·data·for·a·process,·it·is·helpful·to·know·that·anonymous414 </span><span·class="p"·data-group-id="8300663893-14">(</span><span·class="mi">7</span><span·class="p"·data-group-id="8300663893-14">)</span><span·class="w">··</span><span·class="nf">y</span><span·class="p"·data-group-id="8300663893-15">(</span><span·class="mi">3</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·33673f47c2cd9ad4576a099d2ab18ec4fd7cb478ab18a7c6dac579b6c8a5b3ce·...·]-15">)</span><span·class="w">·····</span><span·class="ss">infinity</span></code></pre><p>When·interpreting·the·data·for·a·process,·it·is·helpful·to·know·that·anonymous
415 function·objects·(funs)·are·given·the·following:</p><ul><li>A·name·constructed·from·the·name·of·the·function·in·which·they·are·created</li><li>A·number·(starting·with·0)·indicating·the·number·of·that·fun·within·that415 function·objects·(funs)·are·given·the·following:</p><ul><li>A·name·constructed·from·the·name·of·the·function·in·which·they·are·created</li><li>A·number·(starting·with·0)·indicating·the·number·of·that·fun·within·that
416 function</li></ul><h2·id="atoms"·class="section-heading">416 function</li></ul><h2·id="atoms"·class="section-heading">
417 ··<a·href="#atoms"·class="hover-link">417 ··<a·href="#atoms"·class="hover-link">
418 ····<i·class="ri-link-m"·aria-hidden="true"></i>418 ····<i·class="ri-link-m"·aria-hidden="true"></i>
419 ··</a>419 ··</a>
420 ··<span·class="text">Atoms</span>420 ··<span·class="text">Atoms</span>
421 </h2>421 </h2>
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473 ······<p·class="built-using">473 ······<p·class="built-using">
474 ········Built·using474 ········Built·using
475 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the475 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
476 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>476 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
477 ······</p>477 ······</p>
478 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>478 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
479 ····</footer>479 ····</footer>
480 ··</div>480 ··</div>
481 </main>481 </main>
482 </div>482 </div>
483 <script>483 <script>
484 ··function·mermaidLoaded()·{484 ··function·mermaidLoaded()·{
485 ····mermaid.initialize({485 ····mermaid.initialize({
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338 ······<p·class="built-using">338 ······<p·class="built-using">
339 ········Built·using339 ········Built·using
340 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the340 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
341 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>341 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
342 ······</p>342 ······</p>
343 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>343 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
344 ····</footer>344 ····</footer>
345 ··</div>345 ··</div>
346 </main>346 </main>
347 </div>347 </div>
348 <script>348 <script>
349 ··function·mermaidLoaded()·{349 ··function·mermaidLoaded()·{
350 ····mermaid.initialize({350 ····mermaid.initialize({
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364 <p>Before·a·driver·can·be·called·from·Erlang,·it·must·be·loaded·and·opened.·Loading364 <p>Before·a·driver·can·be·called·from·Erlang,·it·must·be·loaded·and·opened.·Loading
365 is·done·using·the·<a·href="../../../lib/kernel-10.2.6/doc/html/erl_ddll.html"><code·class="inline">erl_ddll</code></a>·module·(the·<a·href="../../../lib/kernel-10.2.6/doc/html/erl_ddll.html"><code·class="inline">erl_ddll</code></a>·driver·that·loads·dynamic365 is·done·using·the·<a·href="../../../lib/kernel-10.2.6/doc/html/erl_ddll.html"><code·class="inline">erl_ddll</code></a>·module·(the·<a·href="../../../lib/kernel-10.2.6/doc/html/erl_ddll.html"><code·class="inline">erl_ddll</code></a>·driver·that·loads·dynamic
366 driver·is·actually·a·driver·itself).·If·loading·is·successful,·the·port·can·be366 driver·is·actually·a·driver·itself).·If·loading·is·successful,·the·port·can·be
367 opened·with·<a·href="erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>.·The·port·name·must·match·the·name·of367 opened·with·<a·href="erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>.·The·port·name·must·match·the·name·of
368 the·shared·library·and·the·name·in·the·driver·entry·structure.</p><p>When·the·port·has·been·opened,·the·driver·can·be·called.·In·the·<code·class="inline">pg_sync</code>368 the·shared·library·and·the·name·in·the·driver·entry·structure.</p><p>When·the·port·has·been·opened,·the·driver·can·be·called.·In·the·<code·class="inline">pg_sync</code>
369 example,·we·do·not·have·any·data·from·the·port,·only·the·return·value·from·the369 example,·we·do·not·have·any·data·from·the·port,·only·the·return·value·from·the
370 <a·href="erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>.</p><p>The·following·code·is·the·Erlang·part·of·the·synchronous·postgres·driver,370 <a·href="erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>.</p><p>The·following·code·is·the·Erlang·part·of·the·synchronous·postgres·driver,
371 <code·class="inline">pg_sync.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2531759311-1">(</span><span·class="ss">pg_sync</span><span·class="p"·data-group-id="2531759311-1">)</span><span·class="p">.</span><span·class="w">371 <code·class="inline">pg_sync.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5318220630-1">(</span><span·class="ss">pg_sync</span><span·class="p"·data-group-id="5318220630-1">)</span><span·class="p">.</span><span·class="w">
372 </span><span·class="w">372 </span><span·class="w">
373 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2531759311-2">(</span><span·class="n">DRV_CONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="2531759311-2">)</span><span·class="p">.</span><span·class="w">373 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5318220630-2">(</span><span·class="n">DRV_CONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5318220630-2">)</span><span·class="p">.</span><span·class="w">
374 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2531759311-3">(</span><span·class="n">DRV_DISCONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="2531759311-3">)</span><span·class="p">.</span><span·class="w">374 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5318220630-3">(</span><span·class="n">DRV_DISCONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="5318220630-3">)</span><span·class="p">.</span><span·class="w">
375 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2531759311-4">(</span><span·class="n">DRV_SELECT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="2531759311-4">)</span><span·class="p">.</span><span·class="w">375 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="5318220630-4">(</span><span·class="n">DRV_SELECT</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="5318220630-4">)</span><span·class="p">.</span><span·class="w">
376 </span><span·class="w">376 </span><span·class="w">
377 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2531759311-5">(</span><span·class="p"·data-group-id="2531759311-6">[</span><span·class="ss">connect</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disconnect</span><span·class="p">/</[·...·truncated·by·diffoscope;·len:·251,·SHA:·8e8a5817aa43d1d8d7c1218817dd451616820aec0d5c93f73892fc9c202ce0d0·...·]-5">)</span><span·class="p">.</span><span·class="w">377 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5318220630-5">(</span><span·class="p"·data-group-id="5318220630-6">[</span><span·class="ss">connect</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disconnect</span><span·class="p">/</[·...·truncated·by·diffoscope;·len:·251,·SHA:·7d23d3febd7415c3cdcd37ed6901b7fe72d1230dd8a7fff6bf7bc909c24e1d87·...·]-5">)</span><span·class="p">.</span><span·class="w">
  
378 </span><span·class="nf">connect</span><span·class="p"·data-group-id="2531759311-7">(</span><span·class="n">ConnectStr</span><span·class="p"·data-group-id="2531759311-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">378 </span><span·class="nf">connect</span><span·class="p"·data-group-id="5318220630-7">(</span><span·class="n">ConnectStr</span><span·class="p"·data-group-id="5318220630-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
379 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="2531759311-8">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;pg_sync&quot;</span><span·class="p"·data-group-id="2531759311-8">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">379 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="5318220630-8">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;pg_sync&quot;</span><span·class="p"·data-group-id="5318220630-8">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
380 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">380 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
381 ········</span><span·class="p"·data-group-id="2531759311-9">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="2531759311-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">381 ········</span><span·class="p"·data-group-id="5318220630-9">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="5318220630-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
382 ········</span><span·class="n">E</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="2531759311-10">(</span><span·class="p"·data-group-id="2531759311-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p"·data-group-id="2531759311-11">}</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·77413a18c0468aa803a81ff2feaf6f155bd252a155685c6a96448bc38d59d06d·...·]-10">)</span><span·class="w">382 ········</span><span·class="n">E</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="5318220630-10">(</span><span·class="p"·data-group-id="5318220630-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p"·data-group-id="5318220630-11">}</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·c26141ff7cc35c57328ee2fd11926f7624a20938005ccb003e51461b14aadd17·...·]-10">)</span><span·class="w">
383 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">383 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
384 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="2531759311-12">(</span><span·class="p"·data-group-id="2531759311-13">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p"·data-group-id="2531759311-13">}</[·...·truncated·by·diffoscope;·len:·202,·SHA:·baaab8a7c032b52df10af632cff31b58d4db1a1f79b3e6b3847b854075a4ee9b·...·]-12">)</span><span·class="p">,</span><span·class="w">384 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="5318220630-12">(</span><span·class="p"·data-group-id="5318220630-13">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p"·data-group-id="5318220630-13">}</[·...·truncated·by·diffoscope;·len:·202,·SHA:·c4b186c6ddb341b9e6485511d7794cc6a05f80eb913cf3c0c20d3ead552cbfae·...·]-12">)</span><span·class="p">,</span><span·class="w">
385 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="2531759311-15">(</span><span·class="nf">port_control</span><span·class="p"·data-group-id="2531759311-16">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_CONNECT</span><span·clas[·...·truncated·by·diffoscope;·len:·166,·SHA:·5a78bc9f2f2731dfac3436409b824c243d9a20e093532d5b6946993e2c2d1d51·...·]-15">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">385 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="5318220630-15">(</span><span·class="nf">port_control</span><span·class="p"·data-group-id="5318220630-16">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_CONNECT</span><span·clas[·...·truncated·by·diffoscope;·len:·166,·SHA:·e3b94ba45c3f10a29b645015bded86407d585cea7e22bf0b8cd7776b91df692f·...·]-15">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
386 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2531759311-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="2531759311-17">}</span><span·class="p">;</span><span·class="w">386 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5318220630-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="5318220630-17">}</span><span·class="p">;</span><span·class="w">
387 ········</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Error</span><span·class="w">387 ········</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Error</span><span·class="w">
388 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">388 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
389 </span><span·class="nf">disconnect</span><span·class="p"·data-group-id="2531759311-18">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2531759311-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">389 </span><span·class="nf">disconnect</span><span·class="p"·data-group-id="5318220630-18">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5318220630-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
390 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="2531759311-19">(</span><span·class="nf">port_control</span><span·class="p"·data-group-id="2531759311-20">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_DISCONNECT</span><span·c[·...·truncated·by·diffoscope;·len:·171,·SHA:·3bf2416895e148d249eae89f0dd2eaabffc7ad004f70f6b1c378bf552257986d·...·]-19">)</span><span·class="p">,</span><span·class="w">390 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="5318220630-19">(</span><span·class="nf">port_control</span><span·class="p"·data-group-id="5318220630-20">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_DISCONNECT</span><span·c[·...·truncated·by·diffoscope;·len:·171,·SHA:·62f1d7891e44afdc3e8fb361631afff932bd705f48cc3a9ed5b8f0e40d464902·...·]-19">)</span><span·class="p">,</span><span·class="w">
391 ····</span><span·class="nf">port_close</span><span·class="p"·data-group-id="2531759311-21">(</span><span·class="n">Port</span><span·class="p"·data-group-id="2531759311-21">)</span><span·class="p">,</span><span·class="w">391 ····</span><span·class="nf">port_close</span><span·class="p"·data-group-id="5318220630-21">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5318220630-21">)</span><span·class="p">,</span><span·class="w">
392 ····</span><span·class="n">R</span><span·class="p">.</span><span·class="w">392 ····</span><span·class="n">R</span><span·class="p">.</span><span·class="w">
  
393 </span><span·class="nf">select</span><span·class="p"·data-group-id="2531759311-22">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Query</span><span·class="p"·data-group-id="2531759311-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">393 </span><span·class="nf">select</span><span·class="p"·data-group-id="5318220630-22">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Query</span><span·class="p"·data-group-id="5318220630-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
394 ····</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="2531759311-23">(</span><span·class="nf">port_control</span><span·class="p"·data-group-id="2531759311-24">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_SELECT</span><span·class[·...·truncated·by·diffoscope;·len:·160,·SHA:·238a2cc72aa034febd04ac97a10d635496c6f7fd0a92b0b6525282b61f159655·...·]-23">)</span><span·class="p">.</span></code></pre><p>The·API·is·simple:</p><ul><li><code·class="inline">connect/1</code>·loads·the·driver,·opens·it,·and·logs·on·to·the·database,·returning394 ····</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="5318220630-23">(</span><span·class="nf">port_control</span><span·class="p"·data-group-id="5318220630-24">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_SELECT</span><span·class[·...·truncated·by·diffoscope;·len:·160,·SHA:·0460f0e32baf7303d52a3ac6228b15685709e7b6e6ced326e7f5b6a44d8048e2·...·]-23">)</span><span·class="p">.</span></code></pre><p>The·API·is·simple:</p><ul><li><code·class="inline">connect/1</code>·loads·the·driver,·opens·it,·and·logs·on·to·the·database,·returning
395 the·Erlang·port·if·successful.</li><li><code·class="inline">select/2</code>·sends·a·query·to·the·driver·and·returns·the·result.</li><li><code·class="inline">disconnect/1</code>·closes·the·database·connection·and·the·driver.·(However,·it395 the·Erlang·port·if·successful.</li><li><code·class="inline">select/2</code>·sends·a·query·to·the·driver·and·returns·the·result.</li><li><code·class="inline">disconnect/1</code>·closes·the·database·connection·and·the·driver.·(However,·it
396 does·not·unload·it.)</li></ul><p>The·connection·string·is·to·be·a·connection·string·for·postgres.</p><p>The·driver·is·loaded·with·<a·href="../../../lib/kernel-10.2.6/doc/html/erl_ddll.html#load_driver/2"><code·class="inline">erl_ddll:load_driver/2</code></a>.·If·this·is·successful,·or·if396 does·not·unload·it.)</li></ul><p>The·connection·string·is·to·be·a·connection·string·for·postgres.</p><p>The·driver·is·loaded·with·<a·href="../../../lib/kernel-10.2.6/doc/html/erl_ddll.html#load_driver/2"><code·class="inline">erl_ddll:load_driver/2</code></a>.·If·this·is·successful,·or·if
397 it·is·already·loaded,·it·is·opened.·This·will·call·the·<code·class="inline">start</code>·function·in·the397 it·is·already·loaded,·it·is·opened.·This·will·call·the·<code·class="inline">start</code>·function·in·the
398 driver.</p><p>We·use·the·<a·href="erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>·function·for·all·calls·into·the398 driver.</p><p>We·use·the·<a·href="erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>·function·for·all·calls·into·the
399 driver.·The·result·from·the·driver·is·returned·immediately·and·converted·to399 driver.·The·result·from·the·driver·is·returned·immediately·and·converted·to
400 terms·by·calling·<a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>.·(We·trust·that·the400 terms·by·calling·<a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>.·(We·trust·that·the
401 terms·returned·from·the·driver·are·well-formed,·otherwise·the·<a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>401 terms·returned·from·the·driver·are·well-formed,·otherwise·the·<a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>
Offset 536, 51 lines modifiedOffset 536, 51 lines modified
536 successful,·or·error·if·it·is·not.·If·the·connection·is·not·yet·established,·we536 successful,·or·error·if·it·is·not.·If·the·connection·is·not·yet·established,·we
537 simply·return;·<code·class="inline">ready_io</code>·is·called·again.</p><p>If·we·have·a·result·from·a·connect,·indicated·by·having·data·in·the·<code·class="inline">x</code>·buffer,537 simply·return;·<code·class="inline">ready_io</code>·is·called·again.</p><p>If·we·have·a·result·from·a·connect,·indicated·by·having·data·in·the·<code·class="inline">x</code>·buffer,
538 we·no·longer·need·to·select·on·output·(<a·href="../../../erts-15.2.6/doc/html/driver_entry.html#ready_output"·title=""><code·class="inline">ready_output</code></a>),·so·we·remove·this·by538 we·no·longer·need·to·select·on·output·(<a·href="../../../erts-15.2.6/doc/html/driver_entry.html#ready_output"·title=""><code·class="inline">ready_output</code></a>),·so·we·remove·this·by
539 calling·<a·href="../../../erts-15.2.6/doc/html/erl_driver.html#driver_select"·title=""><code·class="inline">driver_select</code></a>.</p><p>If·we·are·not·connecting,·we·wait·for·results·from·a·<code·class="inline">PQsendQuery</code>,·so·we·get539 calling·<a·href="../../../erts-15.2.6/doc/html/erl_driver.html#driver_select"·title=""><code·class="inline">driver_select</code></a>.</p><p>If·we·are·not·connecting,·we·wait·for·results·from·a·<code·class="inline">PQsendQuery</code>,·so·we·get
540 the·result·and·return·it.·The·encoding·is·done·with·the·same·functions·as·in·the540 the·result·and·return·it.·The·encoding·is·done·with·the·same·functions·as·in·the
541 earlier·example.</p><p>Error·handling·is·to·be·added·here,·for·example,·checking·that·the·socket·is541 earlier·example.</p><p>Error·handling·is·to·be·added·here,·for·example,·checking·that·the·socket·is
542 still·open,·but·this·is·only·a·simple·example.</p><p>The·Erlang·part·of·the·asynchronous·driver·consists·of·the·sample·file542 still·open,·but·this·is·only·a·simple·example.</p><p>The·Erlang·part·of·the·asynchronous·driver·consists·of·the·sample·file
543 <code·class="inline">pg_async.erl</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3624515505-1">(</span><span·class="ss">pg_async</span><span·class="p"·data-group-id="3624515505-1">)</span><span·class="p">.</span><span·class="w">543 <code·class="inline">pg_async.erl</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9575312410-1">(</span><span·class="ss">pg_async</span><span·class="p"·data-group-id="9575312410-1">)</span><span·class="p">.</span><span·class="w">
544 </span><span·class="w">544 </span><span·class="w">
545 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="3624515505-2">(</span><span·class="n">DRV_CONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$C</span><span·class="p"·data-group-id="3624515505-2">)</span><span·class="p">.</span><span·class="w">545 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="9575312410-2">(</span><span·class="n">DRV_CONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$C</span><span·class="p"·data-group-id="9575312410-2">)</span><span·class="p">.</span><span·class="w">
546 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="3624515505-3">(</span><span·class="n">DRV_DISCONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$D</span><span·class="p"·data-group-id="3624515505-3">)</span><span·class="p">.</span><span·class="w">546 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="9575312410-3">(</span><span·class="n">DRV_DISCONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$D</span><span·class="p"·data-group-id="9575312410-3">)</span><span·class="p">.</span><span·class="w">
547 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="3624515505-4">(</span><span·class="n">DRV_SELECT</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$S</span><span·class="p"·data-group-id="3624515505-4">)</span><span·class="p">.</span><span·class="w">547 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="9575312410-4">(</span><span·class="n">DRV_SELECT</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$S</span><span·class="p"·data-group-id="9575312410-4">)</span><span·class="p">.</span><span·class="w">
548 </span><span·class="w">548 </span><span·class="w">
549 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3624515505-5">(</span><span·class="p"·data-group-id="3624515505-6">[</span><span·class="ss">connect</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disconnect</span><span·class="p">/</[·...·truncated·by·diffoscope;·len:·251,·SHA:·67d3cea8577ac5957b005cbdee74d4934f48fd8f00f9a43e20c3bb2f3c30f56f·...·]-5">)</span><span·class="p">.</span><span·class="w">549 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9575312410-5">(</span><span·class="p"·data-group-id="9575312410-6">[</span><span·class="ss">connect</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disconnect</span><span·class="p">/</[·...·truncated·by·diffoscope;·len:·251,·SHA:·e0b59f2725b43ddab7c628afa41c70fe7b85fd5be6fd9bc679bdb5e1e0379920·...·]-5">)</span><span·class="p">.</span><span·class="w">
  
550 </span><span·class="nf">connect</span><span·class="p"·data-group-id="3624515505-7">(</span><span·class="n">ConnectStr</span><span·class="p"·data-group-id="3624515505-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">550 </span><span·class="nf">connect</span><span·class="p"·data-group-id="9575312410-7">(</span><span·class="n">ConnectStr</span><span·class="p"·data-group-id="9575312410-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
551 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="3624515505-8">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;pg_async&quot;</span><span·class="p"·data-group-id="3624515505-8">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">551 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="9575312410-8">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;pg_async&quot;</span><span·class="p"·data-group-id="9575312410-8">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
552 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">552 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
553 ········</span><span·class="p"·data-group-id="3624515505-9">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="3624515505-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">553 ········</span><span·class="p"·data-group-id="9575312410-9">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="9575312410-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
554 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="3624515505-10">(</span><span·class="p"·data-group-id="3624515505-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">could_not_load_driver</span><span·class="p"·data-group-id="3624515505-11">}</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·b61e7dbb564d7118c6c5f12e9ac00c92c137a35e9df287ffb49eda1895239071·...·]-10">)</span><span·class="w">554 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="9575312410-10">(</span><span·class="p"·data-group-id="9575312410-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">could_not_load_driver</span><span·class="p"·data-group-id="9575312410-11">}</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·f1981a5873e99cf6c0a98209f92817934cf4f2752576962836ec37ffff27645a·...·]-10">)</span><span·class="w">
555 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">555 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
556 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="3624515505-12">(</span><span·class="p"·data-group-id="3624515505-13">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p"·data-group-id="3624515505-13">}</[·...·truncated·by·diffoscope;·len:·232,·SHA:·681988921366b9719e48123654b3b8199b9e93ef6dd9aa4fdf16f8207db97976·...·]-12">)</span><span·class="p">,</span><span·class="w">556 ····</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="9575312410-12">(</span><span·class="p"·data-group-id="9575312410-13">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p"·data-group-id="9575312410-13">}</[·...·truncated·by·diffoscope;·len:·232,·SHA:·65934f3e4a991c82330c00063dc6a7048fe73c0c089dc2f661605a1b6b11dcb5·...·]-12">)</span><span·class="p">,</span><span·class="w">
557 ····</span><span·class="nf">port_control</span><span·class="p"·data-group-id="3624515505-15">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_CONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ConnectStr</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·20ddf81b47952a61e88cdff851b1dd10ff11c359b5ca730d99d9a59b6d74a3ef·...·]-15">)</span><span·class="p">,</span><span·class="w">557 ····</span><span·class="nf">port_control</span><span·class="p"·data-group-id="9575312410-15">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_CONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ConnectStr</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·d9904155ec27a61054dfe27fe6d3523f4025c7f174511eb3769021c29cedca18·...·]-15">)</span><span·class="p">,</span><span·class="w">
558 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="3624515505-16">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-16">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">558 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="9575312410-16">(</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-16">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
559 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">559 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
560 ············</span><span·class="p"·data-group-id="3624515505-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-17">}</span><span·class="p">;</span><span·class="w">560 ············</span><span·class="p"·data-group-id="9575312410-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-17">}</span><span·class="p">;</span><span·class="w">
561 ········</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">561 ········</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
562 ············</span><span·class="n">Error</span><span·class="w">562 ············</span><span·class="n">Error</span><span·class="w">
563 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">563 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
564 </span><span·class="nf">disconnect</span><span·class="p"·data-group-id="3624515505-18">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">564 </span><span·class="nf">disconnect</span><span·class="p"·data-group-id="9575312410-18">(</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
565 ····</span><span·class="nf">port_control</span><span·class="p"·data-group-id="3624515505-19">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_DISCONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·457d12a1e6a78d72a21b9f48b4d56aeea592725e184da9a21c897399a2693d0f·...·]-19">)</span><span·class="p">,</span><span·class="w">565 ····</span><span·class="nf">port_control</span><span·class="p"·data-group-id="9575312410-19">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_DISCONNECT</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·a018accdc24d61660ad78b976ace5cf39e68e9c9f1476aa56458e5fe24377989·...·]-19">)</span><span·class="p">,</span><span·class="w">
566 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="3624515505-20">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-20">)</span><span·class="p">,</span><span·class="w">566 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="9575312410-20">(</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-20">)</span><span·class="p">,</span><span·class="w">
567 ····</span><span·class="nf">port_close</span><span·class="p"·data-group-id="3624515505-21">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-21">)</span><span·class="p">,</span><span·class="w">567 ····</span><span·class="nf">port_close</span><span·class="p"·data-group-id="9575312410-21">(</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-21">)</span><span·class="p">,</span><span·class="w">
568 ····</span><span·class="n">R</span><span·class="p">.</span><span·class="w">568 ····</span><span·class="n">R</span><span·class="p">.</span><span·class="w">
  
569 </span><span·class="nf">select</span><span·class="p"·data-group-id="3624515505-22">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Query</span><span·class="p"·data-group-id="3624515505-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">569 </span><span·class="nf">select</span><span·class="p"·data-group-id="9575312410-22">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Query</span><span·class="p"·data-group-id="9575312410-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
570 ····</span><span·class="nf">port_control</span><span·class="p"·data-group-id="3624515505-23">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_SELECT</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Query</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·3f0bbae0652b58307da602c725cf383789f83ee0796877bee5e3adc98989a799·...·]-23">)</span><span·class="p">,</span><span·class="w">570 ····</span><span·class="nf">port_control</span><span·class="p"·data-group-id="9575312410-23">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">DRV_SELECT</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Query</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·1ae2c4ab7acbec0454f1742742cdc4c15ee9c585ef20fded3683c230f49551f8·...·]-23">)</span><span·class="p">,</span><span·class="w">
571 ····</span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="3624515505-24">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-24">)</span><span·class="p">.</span><span·class="w">571 ····</span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="9575312410-24">(</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-24">)</span><span·class="p">.</span><span·class="w">
  
572 </span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="3624515505-25">(</span><span·class="n">Port</span><span·class="p"·data-group-id="3624515505-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">572 </span><span·class="nf">return_port_data</span><span·class="p"·data-group-id="9575312410-25">(</span><span·class="n">Port</span><span·class="p"·data-group-id="9575312410-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
573 ····</span><span·class="k">receive</span><span·class="w">573 ····</span><span·class="k">receive</span><span·class="w">
574 ········</span><span·class="p"·data-group-id="3624515505-26">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3624515505-27">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·b39c7d868498ee4f16eca7fa8d2d8db4091e5d45cf5ab548bb99acc620630619·...·]-26">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">574 ········</span><span·class="p"·data-group-id="9575312410-26">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9575312410-27">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><[·...·truncated·by·diffoscope;·len:·94,·SHA:·12e23afd092ae44f046ad300ca655e670fbc2ea602ee772a71acae22a50f71aa·...·]-26">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
575 ············</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="3624515505-28">(</span><span·class="n">Data</span><span·class="p"·data-group-id="3624515505-28">)</span><span·class="w">575 ············</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="9575312410-28">(</span><span·class="n">Data</span><span·class="p"·data-group-id="9575312410-28">)</span><span·class="w">
576 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·Erlang·code·is·slightly·different,·as·we·do·not·return·the·result576 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·Erlang·code·is·slightly·different,·as·we·do·not·return·the·result
577 synchronously·from·<a·href="erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>,·instead·we·get·it·from·<a·href="../../../erts-15.2.6/doc/html/erl_driver.html#driver_output"·title=""><code·class="inline">driver_output</code></a>·as577 synchronously·from·<a·href="erlang.html#port_control/3"><code·class="inline">port_control/3</code></a>,·instead·we·get·it·from·<a·href="../../../erts-15.2.6/doc/html/erl_driver.html#driver_output"·title=""><code·class="inline">driver_output</code></a>·as
578 data·in·the·message·queue.·The·function·<code·class="inline">return_port_data</code>·above·receives·data578 data·in·the·message·queue.·The·function·<code·class="inline">return_port_data</code>·above·receives·data
579 from·the·port.·As·the·data·is·in·binary·format,·we·use579 from·the·port.·As·the·data·is·in·binary·format,·we·use
580 <a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>·to·convert·it·to·an·Erlang·term.·Notice580 <a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>·to·convert·it·to·an·Erlang·term.·Notice
581 that·the·driver·is·opened·in·binary·mode·(<a·href="erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>·is581 that·the·driver·is·opened·in·binary·mode·(<a·href="erlang.html#open_port/2"><code·class="inline">open_port/2</code></a>·is
582 called·with·option·<code·class="inline">[binary]</code>).·This·means·that·data·sent·from·the·driver·to·the582 called·with·option·<code·class="inline">[binary]</code>).·This·means·that·data·sent·from·the·driver·to·the
Offset 677, 59 lines modifiedOffset 677, 59 lines modified
677 ····*rp++·=·ERL_DRV_LIST;677 ····*rp++·=·ERL_DRV_LIST;
678 ····*rp++·=·n+1;678 ····*rp++·=·n+1;
679 ····driver_output_term(port,·result,·result_n);679 ····driver_output_term(port,·result,·result_n);
680 ····delete[]·result;680 ····delete[]·result;
681 ····delete·d;681 ····delete·d;
682 }</code></pre><p>This·driver·is·called·like·the·others·from·Erlang.·However,·as·we·use682 }</code></pre><p>This·driver·is·called·like·the·others·from·Erlang.·However,·as·we·use
683 <a·href="../../../erts-15.2.6/doc/html/erl_driver.html#driver_output_term"·title=""><code·class="inline">driver_output_term</code></a>,·there·is·no·need·to·call·<a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>.·The·Erlang·code683 <a·href="../../../erts-15.2.6/doc/html/erl_driver.html#driver_output_term"·title=""><code·class="inline">driver_output_term</code></a>,·there·is·no·need·to·call·<a·href="erlang.html#binary_to_term/1"><code·class="inline">binary_to_term/1</code></a>.·The·Erlang·code
684 is·in·the·sample·file·<code·class="inline">next_perm.erl</code>.</p><p>The·input·is·changed·into·a·list·of·integers·and·sent·to·the·driver.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7395976226-1">(</span><span·class="ss">next_perm</span><span·class="p"·data-group-id="7395976226-1">)</span><span·class="p">.</span><span·class="w">684 is·in·the·sample·file·<code·class="inline">next_perm.erl</code>.</p><p>The·input·is·changed·into·a·list·of·integers·and·sent·to·the·driver.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2933681702-1">(</span><span·class="ss">next_perm</span><span·class="p"·data-group-id="2933681702-1">)</span><span·class="p">.</span><span·class="w">
685 </span><span·class="w">685 </span><span·class="w">
686 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7395976226-2">(</span><span·class="p"·data-group-id="7395976226-3">[</span><span·class="ss">next_perm</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prev_perm</span><span·class="p">/<[·...·truncated·by·diffoscope;·len:·379,·SHA:·f092e0787fb113b749b48c6ce2d756b66bc3a7f6f6bdf958d762230a5eb66b1c·...·]-2">)</span><span·class="p">.</span><span·class="w">686 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2933681702-2">(</span><span·class="p"·data-group-id="2933681702-3">[</span><span·class="ss">next_perm</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prev_perm</span><span·class="p">/<[·...·truncated·by·diffoscope;·len:·379,·SHA:·0f5054575c02ec8063c0a72409ca9d060fa0d2679b0b39050cc9071d21337b9e·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
687 </span><span·class="nf">load</span><span·class="p"·data-group-id="7395976226-4">(</span><span·class="p"·data-group-id="7395976226-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">687 </span><span·class="nf">load</span><span·class="p"·data-group-id="2933681702-4">(</span><span·class="p"·data-group-id="2933681702-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
688 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">whereis</span><span·class="p"·data-group-id="7395976226-5">(</span><span·class="ss">next_perm</span><span·class="p"·data-group-id="7395976226-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">688 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">whereis</span><span·class="p"·data-group-id="2933681702-5">(</span><span·class="ss">next_perm</span><span·class="p"·data-group-id="2933681702-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
689 ········</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">689 ········</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
690 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="7395976226-6">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;next_perm&quot;</span><span·class="p"·data-group-id="7395976226-6">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">690 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">erl_ddll</span><span·class="p">:</span><span·class="nf">load_driver</span><span·class="p"·data-group-id="2933681702-6">(</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;next_perm&quot;</span><span·class="p"·data-group-id="2933681702-6">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
691 ················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">691 ················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
692 ················</span><span·class="p"·data-group-id="7395976226-7">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="7395976226-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">692 ················</span><span·class="p"·data-group-id="2933681702-7">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">already_loaded</span><span·class="p"·data-group-id="2933681702-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
693 ················</span><span·class="n">E</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="7395976226-8">(</span><span·class="n">E</span><span·class="p"·data-group-id="7395976226-8">)</span><span·class="w">693 ················</span><span·class="n">E</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">exit</span><span·class="p"·data-group-id="2933681702-8">(</span><span·class="n">E</span><span·class="p"·data-group-id="2933681702-8">)</span><span·class="w">
694 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">694 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
695 ············</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="7395976226-9">(</span><span·class="p"·data-group-id="7395976226-10">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;next_perm&quot;</span><span·class="p"·data-group-id="7395976226-10">}</span><span[·...·truncated·by·diffoscope;·len:·192,·SHA:·f1a3ab136d9e145f34c0a738e0a07f5dd76affd0ebd88504e1b5e3c4c999d584·...·]-9">)</span><span·class="p">,</span><span·class="w">695 ············</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">open_port</span><span·class="p"·data-group-id="2933681702-9">(</span><span·class="p"·data-group-id="2933681702-10">{</span><span·class="nb">spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;next_perm&quot;</span><span·class="p"·data-group-id="2933681702-10">}</span><span[·...·truncated·by·diffoscope;·len:·192,·SHA:·ea68b369b0aaf21be3758cd60ee3bda5c2dbc03e9dde3e8c5a30681ff02d239c·...·]-9">)</span><span·class="p">,</span><span·class="w">
696 ············</span><span·class="nf">register</span><span·class="p"·data-group-id="7395976226-12">(</span><span·class="ss">next_perm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="7395976226-12">)</span><span·class="p">;</span><span·class="w">696 ············</span><span·class="nf">register</span><span·class="p"·data-group-id="2933681702-12">(</span><span·class="ss">next_perm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="2933681702-12">)</span><span·class="p">;</span><span·class="w">
697 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">697 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
698 ············</span><span·class="ss">ok</span><span·class="w">698 ············</span><span·class="ss">ok</span><span·class="w">
699 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">699 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
700 </span><span·class="nf">list_to_integer_binaries</span><span·class="p"·data-group-id="7395976226-13">(</span><span·class="n">L</span><span·class="p"·data-group-id="7395976226-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">700 </span><span·class="nf">list_to_integer_binaries</span><span·class="p"·data-group-id="2933681702-13">(</span><span·class="n">L</span><span·class="p"·data-group-id="2933681702-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
701 ····</span><span·class="p"·data-group-id="7395976226-14">[</span><span·class="p"·data-group-id="7395976226-15">&lt;&lt;</span><span·class="n">I</span><span·class="p">:</span><span·class="mi">32</span><span·class="o">/</span><span·class="ss">integer</span><span·class="o">-</span><span·class="ss">na[·...·truncated·by·diffoscope;·len:·310,·SHA:·e050aef0de751d67cc9926b09c5d009725a5537997e80029a0e78b701d7ead7d·...·]-14">]</span><span·class="p">.</span><span·class="w">701 ····</span><span·class="p"·data-group-id="2933681702-14">[</span><span·class="p"·data-group-id="2933681702-15">&lt;&lt;</span><span·class="n">I</span><span·class="p">:</span><span·class="mi">32</span><span·class="o">/</span><span·class="ss">integer</span><span·class="o">-</span><span·class="ss">na[·...·truncated·by·diffoscope;·len:·310,·SHA:·71d6563378434bf182d0156a7f734540b53e74631c54011b932557698cbe1169·...·]-14">]</span><span·class="p">.</span><span·class="w">
  
702 </span><span·class="nf">next_perm</span><span·class="p"·data-group-id="7395976226-16">(</span><span·class="n">L</span><span·class="p"·data-group-id="7395976226-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">702 </span><span·class="nf">next_perm</span><span·class="p"·data-group-id="2933681702-16">(</span><span·class="n">L</span><span·class="p"·data-group-id="2933681702-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
703 ····</span><span·class="nf">next_perm</span><span·class="p"·data-group-id="7395976226-17">(</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7395976226-17">)</span><span·class="p">.</span><span·class="w">703 ····</span><span·class="nf">next_perm</span><span·class="p"·data-group-id="2933681702-17">(</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="2933681702-17">)</span><span·class="p">.</span><span·class="w">
  
704 </span><span·class="nf">prev_perm</span><span·class="p"·data-group-id="7395976226-18">(</span><span·class="n">L</span><span·class="p"·data-group-id="7395976226-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">704 </span><span·class="nf">prev_perm</span><span·class="p"·data-group-id="2933681702-18">(</span><span·class="n">L</span><span·class="p"·data-group-id="2933681702-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
705 ····</span><span·class="nf">next_perm</span><span·class="p"·data-group-id="7395976226-19">(</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="7395976226-19">)</span><span·class="p">.</span><span·class="w">705 ····</span><span·class="nf">next_perm</span><span·class="p"·data-group-id="2933681702-19">(</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="2933681702-19">)</span><span·class="p">.</span><span·class="w">
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417 ······<p·class="built-using">417 ······<p·class="built-using">
418 ········Built·using418 ········Built·using
419 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the419 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
420 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>420 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
421 ······</p>421 ······</p>
422 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>422 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
423 ····</footer>423 ····</footer>
424 ··</div>424 ··</div>
425 </main>425 </main>
426 </div>426 </div>
427 <script>427 <script>
428 ··function·mermaidLoaded()·{428 ··function·mermaidLoaded()·{
429 ····mermaid.initialize({429 ····mermaid.initialize({
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304 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>304 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
305 ······</p>305 ······</p>
306 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>306 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
307 ····</footer>307 ····</footer>
308 ··</div>308 ··</div>
309 </main>309 </main>
310 </div>310 </div>
311 <script>311 <script>
312 ··function·mermaidLoaded()·{312 ··function·mermaidLoaded()·{
313 ····mermaid.initialize({313 ····mermaid.initialize({
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149 runtime·system,·more·specifically·to·the·<code·class="inline">init</code>·system·process,·see·<a·href="init.html"><code·class="inline">init</code></a>.</p><p>The·<code·class="inline">init</code>·process·itself·interprets·some·of·these·flags,·the·<em>init·flags</em>.·It149 runtime·system,·more·specifically·to·the·<code·class="inline">init</code>·system·process,·see·<a·href="init.html"><code·class="inline">init</code></a>.</p><p>The·<code·class="inline">init</code>·process·itself·interprets·some·of·these·flags,·the·<em>init·flags</em>.·It
150 also·stores·any·remaining·flags,·the·<em>user·flags</em>.·The·latter·can·be·retrieved150 also·stores·any·remaining·flags,·the·<em>user·flags</em>.·The·latter·can·be·retrieved
151 by·calling·<a·href="init.html#get_argument/1"><code·class="inline">init:get_argument/1</code></a>.</p><p>A·small·number·of·&quot;-&quot;·flags·exist,·which·now·actually·are·emulator·flags,·see151 by·calling·<a·href="init.html#get_argument/1"><code·class="inline">init:get_argument/1</code></a>.</p><p>A·small·number·of·&quot;-&quot;·flags·exist,·which·now·actually·are·emulator·flags,·see
152 the·description·below.</p></li><li><p>Plain·arguments·are·not·interpreted·in·any·way.·They·are·also·stored·by·the152 the·description·below.</p></li><li><p>Plain·arguments·are·not·interpreted·in·any·way.·They·are·also·stored·by·the
153 <code·class="inline">init</code>·process·and·can·be·retrieved·by·calling·<a·href="init.html#get_plain_arguments/0"><code·class="inline">init:get_plain_arguments/0</code></a>.153 <code·class="inline">init</code>·process·and·can·be·retrieved·by·calling·<a·href="init.html#get_plain_arguments/0"><code·class="inline">init:get_plain_arguments/0</code></a>.
154 Plain·arguments·can·occur·before·the·first·flag,·or·after·a·<code·class="inline">--</code>·flag.·Also,154 Plain·arguments·can·occur·before·the·first·flag,·or·after·a·<code·class="inline">--</code>·flag.·Also,
155 the·<code·class="inline">-extra</code>·flag·causes·everything·that·follows·to·become·plain·arguments.</p></li></ul><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·+W·w·-sname·arnie·+R·9·-s·my_init·-extra·+bertie</span><span·class="gp·unselectable">155 the·<code·class="inline">-extra</code>·flag·causes·everything·that·follows·to·become·plain·arguments.</p></li></ul><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·+W·w·-sname·arnie·+R·9·-s·my_init·-extra·+bertie</span><span·class="gp·unselectable">
156 (arnie@host)1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="6208183872-1">(</span><span·class="ss">sname</span><span·class="p"·data-group-id="6208183872-1">)</span><span·class="p">.</span><span·class="w">156 (arnie@host)1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8880421598-1">(</span><span·class="ss">sname</span><span·class="p"·data-group-id="8880421598-1">)</span><span·class="p">.</span><span·class="w">
157 </span><span·class="p"·data-group-id="6208183872-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6208183872-3">[</span><span·class="p"·data-group-id="6208183872-4">[</span><span·class="s">&quot;arnie&quot;</span><span·class="p"·data-group-id="6208183[·...·truncated·by·diffoscope;·len:·109,·SHA:·3ebd792e3e9b9d047baa9881961dc857765b0805e2a6a595f45667bb6c422f5c·...·]-2">}</span><span·class="gp·unselectable">157 </span><span·class="p"·data-group-id="8880421598-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8880421598-3">[</span><span·class="p"·data-group-id="8880421598-4">[</span><span·class="s">&quot;arnie&quot;</span><span·class="p"·data-group-id="8880421[·...·truncated·by·diffoscope;·len:·109,·SHA:·0c072f06a1b80c8483211eb42c0865741885998b3739feaca9f5f10975df216a·...·]-2">}</span><span·class="gp·unselectable">
158 (arnie@host)2&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="6208183872-5">(</span><span·class="p"·data-group-id="6208183872-5">)</span><span·class="p">.</span><span·class="w">158 (arnie@host)2&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="8880421598-5">(</span><span·class="p"·data-group-id="8880421598-5">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="p"·data-group-id="6208183872-6">[</span><span·class="s">&quot;+bertie&quot;</span><span·class="p"·data-group-id="6208183872-6">]</span></code></pre><p>Here·<code·class="inline">+W·w</code>·and·<code·class="inline">+R·9</code>·are·emulator·flags.·<code·class="inline">-s·my_init</code>·is·an·init·flag,159 </span><span·class="p"·data-group-id="8880421598-6">[</span><span·class="s">&quot;+bertie&quot;</span><span·class="p"·data-group-id="8880421598-6">]</span></code></pre><p>Here·<code·class="inline">+W·w</code>·and·<code·class="inline">+R·9</code>·are·emulator·flags.·<code·class="inline">-s·my_init</code>·is·an·init·flag,
160 interpreted·by·<code·class="inline">init</code>.·<code·class="inline">-sname·arnie</code>·is·a·user·flag,·stored·by·<code·class="inline">init</code>.·It·is160 interpreted·by·<code·class="inline">init</code>.·<code·class="inline">-sname·arnie</code>·is·a·user·flag,·stored·by·<code·class="inline">init</code>.·It·is
161 read·by·Kernel·and·causes·the·Erlang·runtime·system·to·become·distributed.161 read·by·Kernel·and·causes·the·Erlang·runtime·system·to·become·distributed.
162 Finally,·everything·after·<code·class="inline">-extra</code>·(that·is,·<code·class="inline">+bertie</code>)·is·considered·as·plain162 Finally,·everything·after·<code·class="inline">-extra</code>·(that·is,·<code·class="inline">+bertie</code>)·is·considered·as·plain
163 arguments.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-myflag·1</span><span·class="gp·unselectable">163 arguments.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-myflag·1</span><span·class="gp·unselectable">
164 1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="9730687476-1">(</span><span·class="ss">myflag</span><span·class="p"·data-group-id="9730687476-1">)</span><span·class="p">.</span><span·class="w">164 1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="1516922384-1">(</span><span·class="ss">myflag</span><span·class="p"·data-group-id="1516922384-1">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p"·data-group-id="9730687476-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="9730687476-3">[</span><span·class="p"·data-group-id="9730687476-4">[</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="9730687476-[·...·truncated·by·diffoscope;·len:·105,·SHA:·6b19bef270c225fe532896ff158e761fcb59c2e0bf5c65eacc8306ef0f0d17fe·...·]-2">}</span><span·class="gp·unselectable">165 </span><span·class="p"·data-group-id="1516922384-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1516922384-3">[</span><span·class="p"·data-group-id="1516922384-4">[</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="1516922384-[·...·truncated·by·diffoscope;·len:·105,·SHA:·4baa120713c73856614bbd47b8b8104b8e13b877be4d877aef88111023973c93·...·]-2">}</span><span·class="gp·unselectable">
166 2&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="9730687476-5">(</span><span·class="p"·data-group-id="9730687476-5">)</span><span·class="p">.</span><span·class="w">166 2&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="1516922384-5">(</span><span·class="p"·data-group-id="1516922384-5">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="p"·data-group-id="9730687476-6">[</span><span·class="p"·data-group-id="9730687476-6">]</span></code></pre><p>Here·the·user·flag·<code·class="inline">-myflag·1</code>·is·passed·to·and·stored·by·the·<code·class="inline">init</code>·process.·It167 </span><span·class="p"·data-group-id="1516922384-6">[</span><span·class="p"·data-group-id="1516922384-6">]</span></code></pre><p>Here·the·user·flag·<code·class="inline">-myflag·1</code>·is·passed·to·and·stored·by·the·<code·class="inline">init</code>·process.·It
168 is·a·user-defined·flag,·presumably·used·by·some·user-defined·application.</p><h2·id="flags"·class="section-heading">168 is·a·user-defined·flag,·presumably·used·by·some·user-defined·application.</p><h2·id="flags"·class="section-heading">
169 ··<a·href="#flags"·class="hover-link">169 ··<a·href="#flags"·class="hover-link">
170 ····<i·class="ri-link-m"·aria-hidden="true"></i>170 ····<i·class="ri-link-m"·aria-hidden="true"></i>
171 ··</a>171 ··</a>
172 ··<span·class="text">Flags</span>172 ··<span·class="text">Flags</span>
173 </h2>173 </h2>
174 <p>In·the·following·list,·init·flags·are·marked·&quot;(init·flag)&quot;.·Unless·otherwise174 <p>In·the·following·list,·init·flags·are·marked·&quot;(init·flag)&quot;.·Unless·otherwise
Offset 700, 15 lines modifiedOffset 700, 15 lines modified
700 processes)·into·a·smaller·set·of·schedulers·when·schedulers·frequently·run700 processes)·into·a·smaller·set·of·schedulers·when·schedulers·frequently·run
701 out·of·work.·When·disabled,·the·frequency·with·which·schedulers·run·out·of701 out·of·work.·When·disabled,·the·frequency·with·which·schedulers·run·out·of
702 work·is·not·taken·into·account·by·the·load·balancing·logic.</p><p><code·class="inline">+scl·false</code>·is·similar·to·<a·href="#%2Bsub"><code·class="inline">+sub·true</code></a>,·but·<code·class="inline">+sub·true</code>702 work·is·not·taken·into·account·by·the·load·balancing·logic.</p><p><code·class="inline">+scl·false</code>·is·similar·to·<a·href="#%2Bsub"><code·class="inline">+sub·true</code></a>,·but·<code·class="inline">+sub·true</code>
703 also·balances·scheduler·utilization·between·schedulers.</p></li><li><p><strong><code·class="inline"·id="+sct">+sct·CpuTopology</code></strong>·-·Sets·a·user-defined·CPU·topology.703 also·balances·scheduler·utilization·between·schedulers.</p></li><li><p><strong><code·class="inline"·id="+sct">+sct·CpuTopology</code></strong>·-·Sets·a·user-defined·CPU·topology.
704 The·user-defined·CPU·topology·overrides704 The·user-defined·CPU·topology·overrides
705 any·automatically·detected·CPU·topology.·The·CPU·topology·is·used·when705 any·automatically·detected·CPU·topology.·The·CPU·topology·is·used·when
706 <a·href="#%2Bsbt">binding·schedulers·to·logical·processors</a>.·This·option·must·be·before706 <a·href="#%2Bsbt">binding·schedulers·to·logical·processors</a>.·This·option·must·be·before
707 <a·href="#%2Bsbt"><code·class="inline">+sbt</code></a>·on·the·command-line.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7896963937-1">(</span><span·class="p"·data-group-id="7896963937-1">)</span><span·class="p">;</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="mi">65535</span><span·class="w">707 <a·href="#%2Bsbt"><code·class="inline">+sbt</code></a>·on·the·command-line.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0107856557-1">(</span><span·class="p"·data-group-id="0107856557-1">)</span><span·class="p">;</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="mi">65535</span><span·class="w">
708 </span><span·class="o">&lt;</span><span·class="n">IdRange</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="o">-</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">708 </span><span·class="o">&lt;</span><span·class="n">IdRange</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="o">-</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">
709 </span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">IdRange</span><span·class="o">&gt;</span><span·class="w">709 </span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Id</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">IdRange</span><span·class="o">&gt;</span><span·class="w">
710 </span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="w">710 </span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">IdOrIdRange</span><span·class="o">&gt;</span><span·class="w">
711 </span><span·class="o">&lt;</span><span·class="n">LogicalIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">711 </span><span·class="o">&lt;</span><span·class="n">LogicalIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">
712 </span><span·class="o">&lt;</span><span·class="n">ThreadIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">T</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">t</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">712 </span><span·class="o">&lt;</span><span·class="n">ThreadIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">T</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">t</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">
713 </span><span·class="o">&lt;</span><span·class="n">CoreIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">C</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">c</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">713 </span><span·class="o">&lt;</span><span·class="n">CoreIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">C</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">c</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">
714 </span><span·class="o">&lt;</span><span·class="n">ProcessorIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">p</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">714 </span><span·class="o">&lt;</span><span·class="n">ProcessorIds</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">p</span><span·class="o">&lt;</span><span·class="n">IdList</span><span·class="o">&gt;</span><span·class="w">
Offset 733, 30 lines modifiedOffset 733, 30 lines modified
733 node.</li><li><code·class="inline">&lt;LogicalIds&gt;&lt;ThreadIds&gt;&lt;CoreIds&gt;&lt;NodeIds&gt;&lt;ProcessorIds&gt;</code>,·that·is,·thread733 node.</li><li><code·class="inline">&lt;LogicalIds&gt;&lt;ThreadIds&gt;&lt;CoreIds&gt;&lt;NodeIds&gt;&lt;ProcessorIds&gt;</code>,·that·is,·thread
734 is·part·of·a·core·that·is·part·of·a·NUMA·node,·which·is·part·of·a734 is·part·of·a·core·that·is·part·of·a·NUMA·node,·which·is·part·of·a
735 processor.</li></ul><p>A·CPU·topology·can·consist·of·both·processor·external,·and·processor735 processor.</li></ul><p>A·CPU·topology·can·consist·of·both·processor·external,·and·processor
736 internal·NUMA·nodes·as·long·as·each·logical·processor·belongs·to·only·one736 internal·NUMA·nodes·as·long·as·each·logical·processor·belongs·to·only·one
737 NUMA·node.·If·<code·class="inline">&lt;ProcessorIds&gt;</code>·is·omitted,·its·default·position·is·before737 NUMA·node.·If·<code·class="inline">&lt;ProcessorIds&gt;</code>·is·omitted,·its·default·position·is·before
738 <code·class="inline">&lt;NodeIds&gt;</code>.·That·is,·the·default·is·processor·external·NUMA·nodes.</p><p>If·a·list·of·identifiers·is·used·in·an·<code·class="inline">&lt;IdDefs&gt;</code>:</p><ul><li><code·class="inline">&lt;LogicalIds&gt;</code>·must·be·a·list·of·identifiers.</li><li>At·least·one·other·identifier·type·besides·<code·class="inline">&lt;LogicalIds&gt;</code>·must·also·have·a738 <code·class="inline">&lt;NodeIds&gt;</code>.·That·is,·the·default·is·processor·external·NUMA·nodes.</p><p>If·a·list·of·identifiers·is·used·in·an·<code·class="inline">&lt;IdDefs&gt;</code>:</p><ul><li><code·class="inline">&lt;LogicalIds&gt;</code>·must·be·a·list·of·identifiers.</li><li>At·least·one·other·identifier·type·besides·<code·class="inline">&lt;LogicalIds&gt;</code>·must·also·have·a
739 list·of·identifiers.</li><li>All·lists·of·identifiers·must·produce·the·same·number·of·identifiers.</li></ul><p>A·simple·example.·A·single·quad·core·processor·can·be·described·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·+sct·L0-3c0-3</span><span·class="gp·unselectable">739 list·of·identifiers.</li><li>All·lists·of·identifiers·must·produce·the·same·number·of·identifiers.</li></ul><p>A·simple·example.·A·single·quad·core·processor·can·be·described·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·+sct·L0-3c0-3</span><span·class="gp·unselectable">
740 1&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="8874549801-1">(</span><span·class="ss">cpu_topology</span><span·class="p"·data-group-id="8874549801-1">)</span><span·class="p">.</span><span·class="w">740 1&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="9459203340-1">(</span><span·class="ss">cpu_topology</span><span·class="p"·data-group-id="9459203340-1">)</span><span·class="p">.</span><span·class="w">
741 </span><span·class="p"·data-group-id="8874549801-2">[</span><span·class="p"·data-group-id="8874549801-3">{</span><span·class="ss">processor</span><span·class="p">,</span><span·class="p"·data-group-id="8874549801-4">[</span><span·class="p"·data-group-id="8874549801-5">{</span><span·class="ss">c[·...·truncated·by·diffoscope;·len:·261,·SHA:·86bf80b2825a59b73b6c2d502831d628d5d99f9117eb459ca679f1c3843241c7·...·]-5">}</span><span·class="p">,</span><span·class="w">741 </span><span·class="p"·data-group-id="9459203340-2">[</span><span·class="p"·data-group-id="9459203340-3">{</span><span·class="ss">processor</span><span·class="p">,</span><span·class="p"·data-group-id="9459203340-4">[</span><span·class="p"·data-group-id="9459203340-5">{</span><span·class="ss">c[·...·truncated·by·diffoscope;·len:·261,·SHA:·0b0e686ae5cac806d62b4b9ea7590194cb1cda3e00cbeb6b5d1656282186b241·...·]-5">}</span><span·class="p">,</span><span·class="w">
742 ·············</span><span·class="p"·data-group-id="8874549801-7">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="8874549801-8">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="8874549801-8">}</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·37ac15ac6bb6e4d86be323ff1d2f3a4a1c04972703ae1e20482135456974cdcd·...·]-7">}</span><span·class="p">,</span><span·class="w">742 ·············</span><span·class="p"·data-group-id="9459203340-7">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9459203340-8">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="9459203340-8">}</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·4ddb7b00c82498ba29273a91c71f08cefb56b0cb1042bdacf6a8ffdbd17809f3·...·]-7">}</span><span·class="p">,</span><span·class="w">
743 ·············</span><span·class="p"·data-group-id="8874549801-9">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="8874549801-10">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="8874549801-10">}<[·...·truncated·by·diffoscope;·len:·47,·SHA:·ee79c4ff5efa315ec34630f980ec0d6eaeb0f59cbd6c0c2da196b2f6b3209114·...·]-9">}</span><span·class="p">,</span><span·class="w">743 ·············</span><span·class="p"·data-group-id="9459203340-9">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9459203340-10">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="9459203340-10">}<[·...·truncated·by·diffoscope;·len:·47,·SHA:·7d1ac625c4cb923f3567ea5e52b4234ad3ad27b0a6c4e00255ba4de3c9cf9a76·...·]-9">}</span><span·class="p">,</span><span·class="w">
744 ·············</span><span·class="p"·data-group-id="8874549801-11">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="8874549801-12">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="8874549801-12">}[·...·truncated·by·diffoscope;·len:·208,·SHA:·51ff9a45087ed0189669403095a75022d07a59c31e7b67d5ecef3842a10d9e5f·...·]-2">]</span></code></pre><p>A·more·complicated·example·with·two·quad·core·processors,·each·processor·in744 ·············</span><span·class="p"·data-group-id="9459203340-11">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9459203340-12">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9459203340-12">}[·...·truncated·by·diffoscope;·len:·208,·SHA:·0dbd2bb24f6362ea9fa2327a34844da5cbf271d1522bdfad844af4e7c2c9914b·...·]-2">]</span></code></pre><p>A·more·complicated·example·with·two·quad·core·processors,·each·processor·in
745 its·own·NUMA·node.·The·ordering·of·logical·processors·is·a·bit·weird.·This745 its·own·NUMA·node.·The·ordering·of·logical·processors·is·a·bit·weird.·This
746 to·give·a·better·example·of·identifier·lists:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·+sct·L0-1,3-2c0-3p0N0:L7,4,6-5c0-3p1N1</span><span·class="gp·unselectable">746 to·give·a·better·example·of·identifier·lists:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·+sct·L0-1,3-2c0-3p0N0:L7,4,6-5c0-3p1N1</span><span·class="gp·unselectable">
747 1&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="2156032362-1">(</span><span·class="ss">cpu_topology</span><span·class="p"·data-group-id="2156032362-1">)</span><span·class="p">.</span><span·class="w">747 1&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="9487161875-1">(</span><span·class="ss">cpu_topology</span><span·class="p"·data-group-id="9487161875-1">)</span><span·class="p">.</span><span·class="w">
748 </span><span·class="p"·data-group-id="2156032362-2">[</span><span·class="p"·data-group-id="2156032362-3">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-4">[</span><span·class="p"·data-group-id="2156032362-5">{</span><span·class="ss">proces[·...·truncated·by·diffoscope;·len:·419,·SHA:·9cf2b81ede2fe2276be3a445de4ebda9f5cf045cb473e265d6d5bc5c354f484c·...·]-7">}</span><span·class="p">,</span><span·class="w">748 </span><span·class="p"·data-group-id="9487161875-2">[</span><span·class="p"·data-group-id="9487161875-3">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-4">[</span><span·class="p"·data-group-id="9487161875-5">{</span><span·class="ss">proces[·...·truncated·by·diffoscope;·len:·419,·SHA:·704f69e58c94367a1f52eed2121d7f17dc9b9ce03bb5f0858c27025947c4fd73·...·]-7">}</span><span·class="p">,</span><span·class="w">
749 ····················</span><span·class="p"·data-group-id="2156032362-9">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-10">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="2156032362-10">}<[·...·truncated·by·diffoscope;·len:·47,·SHA:·9cba9532aceb9b697cb6361981c560e7d8df75df59d0cca966c5c23152e3d019·...·]-9">}</span><span·class="p">,</span><span·class="w">749 ····················</span><span·class="p"·data-group-id="9487161875-9">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-10">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="9487161875-10">}<[·...·truncated·by·diffoscope;·len:·47,·SHA:·2d76fcf5bf85e051f89cf44e01891b1d858791000c48499771c7cd861be3973b·...·]-9">}</span><span·class="p">,</span><span·class="w">
750 ····················</span><span·class="p"·data-group-id="2156032362-11">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-12">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="2156032362-12">}[·...·truncated·by·diffoscope;·len:·48,·SHA:·ba65f59db4eaeb8b05e65f1025d676105be2f719224ca09bc0846f6221162571·...·]-11">}</span><span·class="p">,</span><span·class="w">750 ····················</span><span·class="p"·data-group-id="9487161875-11">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-12">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9487161875-12">}[·...·truncated·by·diffoscope;·len:·48,·SHA:·27be28bb7b15ffb00ac4539c030fc57982740a147d1f9d6ea0c5bf7878dfab33·...·]-11">}</span><span·class="p">,</span><span·class="w">
751 ····················</span><span·class="p"·data-group-id="2156032362-13">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-14">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="2156032362-14">}[·...·truncated·by·diffoscope;·len:·261,·SHA:·702e11b2e1189562d4f89985a6881c7afd608b8e7c32d7319e0e4df9811c22d7·...·]-3">}</span><span·class="p">,</span><span·class="w">751 ····················</span><span·class="p"·data-group-id="9487161875-13">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-14">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="9487161875-14">}[·...·truncated·by·diffoscope;·len:·261,·SHA:·d4e085236cc70412f3d33be1ed423f4dd396c29161e67c734247ff4358240eeb·...·]-3">}</span><span·class="p">,</span><span·class="w">
752 ·</span><span·class="p"·data-group-id="2156032362-15">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-16">[</span><span·class="p"·data-group-id="2156032362-17">{</span><span·class="ss">processor</span><span·class="p">,</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·373,·SHA:·156b8d926fe301a8cfa6a12e46f41ccd887ec588a582700ad3d729354d547af2·...·]-19">}</span><span·class="p">,</span><span·class="w">752 ·</span><span·class="p"·data-group-id="9487161875-15">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-16">[</span><span·class="p"·data-group-id="9487161875-17">{</span><span·class="ss">processor</span><span·class="p">,</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·373,·SHA:·c6a30647db200685b4f4f844c3848c7ea2be47060ba059af22e43d814c38548c·...·]-19">}</span><span·class="p">,</span><span·class="w">
753 ····················</span><span·class="p"·data-group-id="2156032362-21">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-22">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="2156032362-22">}[·...·truncated·by·diffoscope;·len:·48,·SHA:·ba65f59db4eaeb8b05e65f1025d676105be2f719224ca09bc0846f6221162571·...·]-21">}</span><span·class="p">,</span><span·class="w">753 ····················</span><span·class="p"·data-group-id="9487161875-21">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-22">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="9487161875-22">}[·...·truncated·by·diffoscope;·len:·48,·SHA:·27be28bb7b15ffb00ac4539c030fc57982740a147d1f9d6ea0c5bf7878dfab33·...·]-21">}</span><span·class="p">,</span><span·class="w">
754 ····················</span><span·class="p"·data-group-id="2156032362-23">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-24">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="2156032362-24">}</span><span·class="p"·data-group-id="2156032362-23">}</span><span·class="p">,</span><span·class="w"> 
755 ····················</span><span·class="p"·data-group-id="2156032362-25">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="2156032362-26">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="2156032362-26">}[·...·truncated·by·diffoscope;·len:·418,·SHA:·7a985f9586ed5d0a420771f12024ae08a82be48c7336edace2337a6d493cd671·...·]754 ····················</span><span·class="p"·data-group-id="9487161875-23">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-24">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="9487161875-24">}[·...·truncated·by·diffoscope;·len:·101,·SHA:·73c85e758781cf3ca1c0dd40e2ddc9b78cfadbf98342b74c01c4f7fc5884d224·...·]
 755 ····················</span><span·class="p"·data-group-id="9487161875-25">{</span><span·class="ss">core</span><span·class="p">,</span><span·class="p"·data-group-id="9487161875-26">{</span><span·class="ss">logical</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9487161875-26">}</span><span·class="p"·data-group-id="9487161875-25">}</span><span·class="p"·data-group-id="9487161875-18">]</span><span·class="p"·data-group-id="9487161875-17">}</span><span·class="p"·data-group-id="9487161875-16">]</span><span·class="p"·data-group-id="9487161875-15">}</span><span·class="p"·data-group-id="9487161875-2">]</span></code></pre><p>As·long·as·real·identifiers·are·correct,·it·is·OK·to·pass·a·CPU·topology
756 that·is·not·a·correct·description·of·the·CPU·topology.·When·used·with·care756 that·is·not·a·correct·description·of·the·CPU·topology.·When·used·with·care
757 this·can·be·very·useful.·This·to·trick·the·emulator·to·bind·its·schedulers757 this·can·be·very·useful.·This·to·trick·the·emulator·to·bind·its·schedulers
758 as·you·want.·For·example,·if·you·want·to·run·multiple·Erlang·runtime·systems758 as·you·want.·For·example,·if·you·want·to·run·multiple·Erlang·runtime·systems
759 on·the·same·machine,·you·want·to·reduce·the·number·of·schedulers·used·and759 on·the·same·machine,·you·want·to·reduce·the·number·of·schedulers·used·and
760 manipulate·the·CPU·topology·so·that·they·bind·to·different·logical·CPUs.·An760 manipulate·the·CPU·topology·so·that·they·bind·to·different·logical·CPUs.·An
761 example,·with·two·Erlang·runtime·systems·on·a·quad·core·machine:</p><pre><code·class="text">%·erl·+sct·L0-3c0-3·+sbt·db·+S3:2·-detached·-noinput·-noshell·-sname·one761 example,·with·two·Erlang·runtime·systems·on·a·quad·core·machine:</p><pre><code·class="text">%·erl·+sct·L0-3c0-3·+sbt·db·+S3:2·-detached·-noinput·-noshell·-sname·one
762 %·erl·+sct·L3-0c0-3·+sbt·db·+S3:2·-detached·-noinput·-noshell·-sname·two</code></pre><p>In·this·example,·each·runtime·system·have·two·schedulers·each·online,·and762 %·erl·+sct·L3-0c0-3·+sbt·db·+S3:2·-detached·-noinput·-noshell·-sname·two</code></pre><p>In·this·example,·each·runtime·system·have·two·schedulers·each·online,·and
Offset 923, 18 lines modifiedOffset 923, 18 lines modified
923 </h2>923 </h2>
924 <p>The·standard·Erlang/OTP·system·can·be·reconfigured·to·change·the·default924 <p>The·standard·Erlang/OTP·system·can·be·reconfigured·to·change·the·default
925 behavior·on·startup.</p><ul><li><p><strong>The·<code·class="inline">.erlang</code>·startup·file</strong>·-·When·Erlang/OTP·is·started,·the·system925 behavior·on·startup.</p><ul><li><p><strong>The·<code·class="inline">.erlang</code>·startup·file</strong>·-·When·Erlang/OTP·is·started,·the·system
926 searches·for·a·file·named·<code·class="inline">.erlang</code>·in·the926 searches·for·a·file·named·<code·class="inline">.erlang</code>·in·the
927 <a·href="init.html#home">user's·home·directory</a>·and·then927 <a·href="init.html#home">user's·home·directory</a>·and·then
928 <a·href="../../../lib/stdlib-6.2.2/doc/html/filename.html#user_config"><code·class="inline">filename:basedir(user_config,·&quot;erlang&quot;)</code></a>.</p><p>If·an·<code·class="inline">.erlang</code>·file·is·found,·it·is·assumed·to·contain·valid·Erlang928 <a·href="../../../lib/stdlib-6.2.2/doc/html/filename.html#user_config"><code·class="inline">filename:basedir(user_config,·&quot;erlang&quot;)</code></a>.</p><p>If·an·<code·class="inline">.erlang</code>·file·is·found,·it·is·assumed·to·contain·valid·Erlang
929 expressions.·These·expressions·are·evaluated·as·if·they·were·input·to·the929 expressions.·These·expressions·are·evaluated·as·if·they·were·input·to·the
930 shell.</p><p>A·typical·<code·class="inline">.erlang</code>·file·contains·a·set·of·search·paths,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6481086880-1">(</span><span·class="s">&quot;executing·user·profile·in·$HOME/.erlang\n&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="6481086880-2">[</span><span·class="p"·data-group-id="6481086880-2">]</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·4055c9ed5ac20580a950ff4e5b07a88d4fc2d8c60bcb9dd3d58cdacfa35a6d14·...·]-1">)</span><span·class="p">.</span><span·class="w">930 shell.</p><p>A·typical·<code·class="inline">.erlang</code>·file·contains·a·set·of·search·paths,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3290631532-1">(</span><span·class="s">&quot;executing·user·profile·in·$HOME/.erlang\n&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="3290631532-2">[</span><span·class="p"·data-group-id="3290631532-2">]</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·deed9cc4fc902b449d963c5f33c4c8c825b300bae0bd3ecca58c37a50ff479d1·...·]-1">)</span><span·class="p">.</span><span·class="w">
931 </span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">add_path</span><span·class="p"·data-group-id="6481086880-3">(</span><span·class="s">&quot;/home/calvin/test/ebin&quot;</span><span·class="p"·data-group-id="6481086880-3">)</span><span·class="p">.</span><span·class="w">931 </span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">add_path</span><span·class="p"·data-group-id="3290631532-3">(</span><span·class="s">&quot;/home/calvin/test/ebin&quot;</span><span·class="p"·data-group-id="3290631532-3">)</span><span·class="p">.</span><span·class="w">
932 </span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">add_path</span><span·class="p"·data-group-id="6481086880-4">(</span><span·class="s">&quot;/home/hobbes/bigappl-1.2/ebin&quot;</span><span·class="p"·data-group-id="6481086880-4">)</span><span·class="p">.</span><span·class="w">932 </span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">add_path</span><span·class="p"·data-group-id="3290631532-4">(</span><span·class="s">&quot;/home/hobbes/bigappl-1.2/ebin&quot;</span><span·class="p"·data-group-id="3290631532-4">)</span><span·class="p">.</span><span·class="w">
933 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6481086880-5">(</span><span·class="s">&quot;.erlang·rc·finished\n&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="6481086880-6">[</span><span·class="p"·data-group-id="6481086880-6">]</span><span·class="p"·data-group-id="6481086880-5">)</span><span·class="p">.</span></code></pre></li><li><p><strong>user_default</strong>·and·<strong>shell_default</strong>·-·Functions·in·the·shell·that·are·not933 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3290631532-5">(</span><span·class="s">&quot;.erlang·rc·finished\n&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="3290631532-6">[</span><span·class="p"·data-group-id="3290631532-6">]</span><span·class="p"·data-group-id="3290631532-5">)</span><span·class="p">.</span></code></pre></li><li><p><strong>user_default</strong>·and·<strong>shell_default</strong>·-·Functions·in·the·shell·that·are·not
934 prefixed·by·a·module·name·are·assumed·to·be·functional·objects·(funs),934 prefixed·by·a·module·name·are·assumed·to·be·functional·objects·(funs),
935 built-in·functions·(BIFs),·or·belong·to·the·module·<code·class="inline">user_default</code>·or935 built-in·functions·(BIFs),·or·belong·to·the·module·<code·class="inline">user_default</code>·or
936 <code·class="inline">shell_default</code>.</p><p>To·include·private·shell·commands,·define·them·in·a·module·<code·class="inline">user_default</code>·and936 <code·class="inline">shell_default</code>.</p><p>To·include·private·shell·commands,·define·them·in·a·module·<code·class="inline">user_default</code>·and
937 add·the·following·argument·as·the·first·line·in·the·<code·class="inline">.erlang</code>·file:</p><pre><code·class="text">code:load_abs(&quot;..../user_default&quot;).</code></pre></li><li><p><strong>erl</strong>·-·If·the·contents·of·<code·class="inline">.erlang</code>·are·changed·and·a·private·version·of937 add·the·following·argument·as·the·first·line·in·the·<code·class="inline">.erlang</code>·file:</p><pre><code·class="text">code:load_abs(&quot;..../user_default&quot;).</code></pre></li><li><p><strong>erl</strong>·-·If·the·contents·of·<code·class="inline">.erlang</code>·are·changed·and·a·private·version·of
938 <code·class="inline">user_default</code>·is·defined,·the·Erlang/OTP·environment·can·be·customized.·More938 <code·class="inline">user_default</code>·is·defined,·the·Erlang/OTP·environment·can·be·customized.·More
939 powerful·changes·can·be·made·by·supplying·command-line·arguments·in·the939 powerful·changes·can·be·made·by·supplying·command-line·arguments·in·the
940 startup·script·<code·class="inline">erl</code>.·For·more·information,·see·<a·href="init.html"><code·class="inline">init</code></a>.</p></li></ul><h2·id="see-also"·class="section-heading">940 startup·script·<code·class="inline">erl</code>.·For·more·information,·see·<a·href="init.html"><code·class="inline">init</code></a>.</p></li></ul><h2·id="see-also"·class="section-heading">
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988 ······<p·class="built-using">988 ······<p·class="built-using">
989 ········Built·using989 ········Built·using
990 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the990 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
991 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>991 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
992 ······</p>992 ······</p>
993 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>993 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
994 ····</footer>994 ····</footer>
995 ··</div>995 ··</div>
996 </main>996 </main>
997 </div>997 </div>
998 <script>998 <script>
999 ··function·mermaidLoaded()·{999 ··function·mermaidLoaded()·{
1000 ····mermaid.initialize({1000 ····mermaid.initialize({
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Offset 252, 32 lines modifiedOffset 252, 32 lines modified
252 ---252 ---
253 sequenceDiagram253 sequenceDiagram
254 ····participant·client·as·Client·(or·Node)254 ····participant·client·as·Client·(or·Node)
255 ····participant·EPMD255 ····participant·EPMD
256 ····256 ····
257 ····client·-&gt;&gt;·EPMD:·NAMES_REQ257 ····client·-&gt;&gt;·EPMD:·NAMES_REQ
258 ····EPMD·--&gt;&gt;·client:·NAMES_RESP</code></pre><table><thead><tr><th·style="text-align:·left;">1</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">110</code></td></tr></tbody></table><p><em>Table:·NAMES_REQ·(110)</em></p><p>The·response·for·a·<code·class="inline">NAMES_REQ</code>·is·as·follows:</p><table><thead><tr><th·style="text-align:·left;">4</th><th·style="text-align:·left;"></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">EPMDPortNo</code></td><td·style="text-align:·left;"><code·class="inline">NodeInfo*</code></td></tr></tbody></table><p><em>Table:·NAMES_RESP</em></p><p><code·class="inline">NodeInfo</code>·is·a·string·written·for·each·active·node.·When·all·<code·class="inline">NodeInfo</code>·has258 ····EPMD·--&gt;&gt;·client:·NAMES_RESP</code></pre><table><thead><tr><th·style="text-align:·left;">1</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">110</code></td></tr></tbody></table><p><em>Table:·NAMES_REQ·(110)</em></p><p>The·response·for·a·<code·class="inline">NAMES_REQ</code>·is·as·follows:</p><table><thead><tr><th·style="text-align:·left;">4</th><th·style="text-align:·left;"></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">EPMDPortNo</code></td><td·style="text-align:·left;"><code·class="inline">NodeInfo*</code></td></tr></tbody></table><p><em>Table:·NAMES_RESP</em></p><p><code·class="inline">NodeInfo</code>·is·a·string·written·for·each·active·node.·When·all·<code·class="inline">NodeInfo</code>·has
259 been·written·the·connection·is·closed·by·the·EPMD.</p><p><code·class="inline">NodeInfo</code>·is,·as·expressed·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9843554239-1">(</span><span·class="s">&quot;name·~ts·at·port·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9843554239-2">[</span><span·[·...·truncated·by·diffoscope;·len:·194,·SHA:·e31fe317a9c073d8f888649f9341d7bb549a7365a22bae5f75742598b4d68207·...·]-1">)</span><span·class="p">.</span></code></pre><h3·id="dump-all-data-from-epmd"·class="section-heading">259 been·written·the·connection·is·closed·by·the·EPMD.</p><p><code·class="inline">NodeInfo</code>·is,·as·expressed·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6352161617-1">(</span><span·class="s">&quot;name·~ts·at·port·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6352161617-2">[</span><span·[·...·truncated·by·diffoscope;·len:·194,·SHA:·7ed294f1727246f4e11a1e63c1bc5eb5ccb565ef3cbdaf58fee987081528f6df·...·]-1">)</span><span·class="p">.</span></code></pre><h3·id="dump-all-data-from-epmd"·class="section-heading">
260 ··<a·href="#dump-all-data-from-epmd"·class="hover-link">260 ··<a·href="#dump-all-data-from-epmd"·class="hover-link">
261 ····<i·class="ri-link-m"·aria-hidden="true"></i>261 ····<i·class="ri-link-m"·aria-hidden="true"></i>
262 ··</a>262 ··</a>
263 ··<span·class="text">Dump·All·Data·from·EPMD</span>263 ··<span·class="text">Dump·All·Data·from·EPMD</span>
264 </h3>264 </h3>
265 <p>This·request·is·not·really·used,·it·is·to·be·regarded·as·a·debug·feature.</p><pre><code·class="mermaid">---265 <p>This·request·is·not·really·used,·it·is·to·be·regarded·as·a·debug·feature.</p><pre><code·class="mermaid">---
266 title:·Dump·All·Data·from·EPMD266 title:·Dump·All·Data·from·EPMD
267 ---267 ---
268 sequenceDiagram268 sequenceDiagram
269 ····participant·client·as·Client·(or·Node)269 ····participant·client·as·Client·(or·Node)
270 ····participant·EPMD270 ····participant·EPMD
271 ····271 ····
272 ····client·-&gt;&gt;·EPMD:·DUMP_REQ272 ····client·-&gt;&gt;·EPMD:·DUMP_REQ
273 ····EPMD·--&gt;&gt;·client:·DUMP_RESP</code></pre><table><thead><tr><th·style="text-align:·left;">1</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">100</code></td></tr></tbody></table><p><em>Table:·DUMP_REQ</em></p><p>The·response·for·a·<code·class="inline">DUMP_REQ</code>·is·as·follows:</p><table><thead><tr><th·style="text-align:·left;">4</th><th·style="text-align:·left;"></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">EPMDPortNo</code></td><td·style="text-align:·left;"><code·class="inline">NodeInfo*</code></td></tr></tbody></table><p><em>Table:·DUMP_RESP</em></p><p><code·class="inline">NodeInfo</code>·is·a·string·written·for·each·node·kept·in·the·EPMD.·When·all273 ····EPMD·--&gt;&gt;·client:·DUMP_RESP</code></pre><table><thead><tr><th·style="text-align:·left;">1</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">100</code></td></tr></tbody></table><p><em>Table:·DUMP_REQ</em></p><p>The·response·for·a·<code·class="inline">DUMP_REQ</code>·is·as·follows:</p><table><thead><tr><th·style="text-align:·left;">4</th><th·style="text-align:·left;"></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">EPMDPortNo</code></td><td·style="text-align:·left;"><code·class="inline">NodeInfo*</code></td></tr></tbody></table><p><em>Table:·DUMP_RESP</em></p><p><code·class="inline">NodeInfo</code>·is·a·string·written·for·each·node·kept·in·the·EPMD.·When·all
274 <code·class="inline">NodeInfo</code>·has·been·written·the·connection·is·closed·by·the·EPMD.</p><p><code·class="inline">NodeInfo</code>·is,·as·expressed·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4360697538-1">(</span><span·class="s">&quot;active·name·····~ts·at·port·</span><span·class="si">~p</span><span·class="s">,·fd·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">274 <code·class="inline">NodeInfo</code>·has·been·written·the·connection·is·closed·by·the·EPMD.</p><p><code·class="inline">NodeInfo</code>·is,·as·expressed·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1160135473-1">(</span><span·class="s">&quot;active·name·····~ts·at·port·</span><span·class="si">~p</span><span·class="s">,·fd·=·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
275 ··········</span><span·class="p"·data-group-id="4360697538-2">[</span><span·class="n">NodeName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4360697538-2">]</span><s[·...·truncated·by·diffoscope;·len:·266,·SHA:·603a8124984131ab667c648b78db829b2782f7dd94269e4a3e016341e0e9b23c·...·]-1">(</span><span·class="s">&quot;old/unused·name·~ts·at·port·</span><span·class="si">~p</span><span·class="s">,·fd·=·</span><span·class="si">~p</span><span·class="s">·</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">275 ··········</span><span·class="p"·data-group-id="1160135473-2">[</span><span·class="n">NodeName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="1160135473-2">]</span><s[·...·truncated·by·diffoscope;·len:·266,·SHA:·a44909df28ae2207033d68bad8fa1760d4535ec4b2dfb520297239d24178a92e·...·]-1">(</span><span·class="s">&quot;old/unused·name·~ts·at·port·</span><span·class="si">~p</span><span·class="s">,·fd·=·</span><span·class="si">~p</span><span·class="s">·</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
276 ··········</span><span·class="p"·data-group-id="4657374634-2">[</span><span·class="n">NodeName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4657374634-2">]</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·9209180802be8dad7a720da308b9e2e8821c0ec78b8c113c5a44aace9773e1e4·...·]-1">)</span><span·class="p">.</span></code></pre><h3·id="kill-epmd"·class="section-heading">276 ··········</span><span·class="p"·data-group-id="6448273732-2">[</span><span·class="n">NodeName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="6448273732-2">]</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·aafb9b1e23fe54b0a05e6818936bfa09a7e4533f1c44403b02aeea3f9d46f17d·...·]-1">)</span><span·class="p">.</span></code></pre><h3·id="kill-epmd"·class="section-heading">
277 ··<a·href="#kill-epmd"·class="hover-link">277 ··<a·href="#kill-epmd"·class="hover-link">
278 ····<i·class="ri-link-m"·aria-hidden="true"></i>278 ····<i·class="ri-link-m"·aria-hidden="true"></i>
279 ··</a>279 ··</a>
280 ··<span·class="text">Kill·EPMD</span>280 ··<span·class="text">Kill·EPMD</span>
281 </h3>281 </h3>
282 <p>This·request·kills·the·running·EPMD.·It·is·almost·never·used.</p><pre><code·class="mermaid">---282 <p>This·request·kills·the·running·EPMD.·It·is·almost·never·used.</p><pre><code·class="mermaid">---
283 title:·Kill·EPMD283 title:·Kill·EPMD
Offset 407, 54 lines modifiedOffset 407, 54 lines modified
407 received·from·<code·class="inline">A</code>·is·correct·and·generates·a·digest·from·the·challenge407 received·from·<code·class="inline">A</code>·is·correct·and·generates·a·digest·from·the·challenge
408 received·from·<code·class="inline">A</code>.·The·digest·is·then·sent·to·<code·class="inline">A</code>.·The·message·is·as·follows:</p><table><thead><tr><th·style="text-align:·left;">1</th><th·style="text-align:·left;">16</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">'a'</code></td><td·style="text-align:·left;"><code·class="inline">Digest</code></td></tr></tbody></table><p><em>Table:·The·challenge_ack·message</em></p><p><code·class="inline">Digest</code>·is·the·digest·calculated·by·<code·class="inline">B</code>·for·<code·class="inline">A</code>'s·challenge.</p></li><li><p><strong>7)·check</strong>·-·<code·class="inline">A</code>·checks·the·digest·from·<code·class="inline">B</code>·and·the·connection·is·up.</p></li></ul><h3·id="semigraphic-view"·class="section-heading">408 received·from·<code·class="inline">A</code>.·The·digest·is·then·sent·to·<code·class="inline">A</code>.·The·message·is·as·follows:</p><table><thead><tr><th·style="text-align:·left;">1</th><th·style="text-align:·left;">16</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">'a'</code></td><td·style="text-align:·left;"><code·class="inline">Digest</code></td></tr></tbody></table><p><em>Table:·The·challenge_ack·message</em></p><p><code·class="inline">Digest</code>·is·the·digest·calculated·by·<code·class="inline">B</code>·for·<code·class="inline">A</code>'s·challenge.</p></li><li><p><strong>7)·check</strong>·-·<code·class="inline">A</code>·checks·the·digest·from·<code·class="inline">B</code>·and·the·connection·is·up.</p></li></ul><h3·id="semigraphic-view"·class="section-heading">
409 ··<a·href="#semigraphic-view"·class="hover-link">409 ··<a·href="#semigraphic-view"·class="hover-link">
410 ····<i·class="ri-link-m"·aria-hidden="true"></i>410 ····<i·class="ri-link-m"·aria-hidden="true"></i>
411 ··</a>411 ··</a>
412 ··<span·class="text">Semigraphic·View</span>412 ··<span·class="text">Semigraphic·View</span>
413 </h3>413 </h3>
414 <pre><code·class="makeup·erlang"·translate="no"><span·class="n">A</span><span·class="w">·</span><span·class="p"·data-group-id="1627905383-1">(</span><span·class="ss">initiator</span><span·class="p"·data-group-id="1627905383-1">)</span><span·class="w">······································</span><span·class="n">B</span><span·class="w">·</span><span·class="p"·data-group-id="16279053[·...·truncated·by·diffoscope;·len:·87,·SHA:·6dcd860e656b8b1ae66972835772dc2a49787c9d19e03c8214940e9240880278·...·]-2">)</span><span·class="w">414 <pre><code·class="makeup·erlang"·translate="no"><span·class="n">A</span><span·class="w">·</span><span·class="p"·data-group-id="6409951137-1">(</span><span·class="ss">initiator</span><span·class="p"·data-group-id="6409951137-1">)</span><span·class="w">······································</span><span·class="n">B</span><span·class="w">·</span><span·class="p"·data-group-id="64099511[·...·truncated·by·diffoscope;·len:·87,·SHA:·8bbec2120830690dd2d7ef9940a4b164cd9c88a33a250a3111372b0b7c288d2c·...·]-2">)</span><span·class="w">
  
415 </span><span·class="n">TCP</span><span·class="w">·</span><span·class="ss">connect</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">&gt;</span><span·class="w">415 </span><span·class="n">TCP</span><span·class="w">·</span><span·class="ss">connect</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">&gt;</span><span·class="w">
416 ···················································</span><span·class="n">TCP</span><span·class="w">·</span><span·class="ss">accept</span><span·class="w">416 ···················································</span><span·class="n">TCP</span><span·class="w">·</span><span·class="ss">accept</span><span·class="w">
  
417 </span><span·class="ss">send_name</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">&gt;</span><span·class="w">417 </span><span·class="ss">send_name</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">&gt;</span><span·class="w">
418 ···················································</span><span·class="ss">recv_name</span><span·class="w">418 ···················································</span><span·class="ss">recv_name</span><span·class="w">
  
419 ··</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">·</span><span·class="ss">send_status</span><span·class="w">419 ··</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">·</span><span·class="ss">send_status</span><span·class="w">
420 </span><span·class="nf">recv_status</span><span·class="w">420 </span><span·class="nf">recv_status</span><span·class="w">
421 </span><span·class="p"·data-group-id="1627905383-3">(</span><span·class="k">if</span><span·class="w">·</span><span·class="ss">status</span><span·class="w">·</span><span·class="ss">was</span><span·class="w">·</span><span·class="ss">&#39;alive&#39;</span><span·class="w">421 </span><span·class="p"·data-group-id="6409951137-3">(</span><span·class="k">if</span><span·class="w">·</span><span·class="ss">status</span><span·class="w">·</span><span·class="ss">was</span><span·class="w">·</span><span·class="ss">&#39;alive&#39;</span><span·class="w">
422 ·</span><span·class="ss">send_status</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">422 ·</span><span·class="ss">send_status</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
423 ···················································</span><span·class="ss">recv_status</span><span·class="p"·data-group-id="1627905383-3">)</span><span·class="w">423 ···················································</span><span·class="ss">recv_status</span><span·class="p"·data-group-id="6409951137-3">)</span><span·class="w">
  
424 ··························</span><span·class="p"·data-group-id="1627905383-4">(</span><span·class="n">ChB</span><span·class="p"·data-group-id="1627905383-4">)</span><span·class="w">······················</span><span·class="n">ChB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·119,·SHA:·fbb65b75340392ad5e9fd4a17fd4a530a7792f39703412528f975dc5a3f0b81e·...·]-5">)</span><span·class="w">424 ··························</span><span·class="p"·data-group-id="6409951137-4">(</span><span·class="n">ChB</span><span·class="p"·data-group-id="6409951137-4">)</span><span·class="w">······················</span><span·class="n">ChB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·119,·SHA:·e4c18d11a7eb743b003a987d3019a904838f54a6e8f0257de0677eb1430177fe·...·]-5">)</span><span·class="w">
425 ··</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">·</span><span·class="ss">send_challenge</span><span·class="w">425 ··</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">·</span><span·class="ss">send_challenge</span><span·class="w">
426 </span><span·class="nf">recv_challenge</span><span·class="w">426 </span><span·class="nf">recv_challenge</span><span·class="w">
  
427 </span><span·class="p"·data-group-id="1627905383-6">(</span><span·class="k">if</span><span·class="w">·</span><span·class="ss">old</span><span·class="w">·</span><span·class="ss">send_name</span><span·class="w">427 </span><span·class="p"·data-group-id="6409951137-6">(</span><span·class="k">if</span><span·class="w">·</span><span·class="ss">old</span><span·class="w">·</span><span·class="ss">send_name</span><span·class="w">
428 ·</span><span·class="ss">send_complement</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">428 ·</span><span·class="ss">send_complement</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
429 ···················································</span><span·class="ss">recv_complement</span><span·class="p"·data-group-id="1627905383-6">)</span><span·class="w">429 ···················································</span><span·class="ss">recv_complement</span><span·class="p"·data-group-id="6409951137-6">)</span><span·class="w">
  
430 </span><span·class="n">ChA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">gen_challenge</span><span·class="p"·data-group-id="1627905383-7">(</span><span·class="p"·data-group-id="1627905383-7">)</span><span·class="p">,</span><span·class="w">430 </span><span·class="n">ChA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">gen_challenge</span><span·class="p"·data-group-id="6409951137-7">(</span><span·class="p"·data-group-id="6409951137-7">)</span><span·class="p">,</span><span·class="w">
431 </span><span·class="n">OCA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">out_cookie</span><span·class="p"·data-group-id="1627905383-8">(</span><span·class="n">B</span><span·class="p"·data-group-id="1627905383-8">)</span><span·class="p">,</span><span·class="w">431 </span><span·class="n">OCA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">out_cookie</span><span·class="p"·data-group-id="6409951137-8">(</span><span·class="n">B</span><span·class="p"·data-group-id="6409951137-8">)</span><span·class="p">,</span><span·class="w">
432 </span><span·class="n">DiA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="p"·data-group-id="1627905383-9">(</span><span·class="n">ChB</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OCA</span><span·class="p"·data-group-id="1627905383-9">)</span><span·class="w">432 </span><span·class="n">DiA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="p"·data-group-id="6409951137-9">(</span><span·class="n">ChB</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OCA</span><span·class="p"·data-group-id="6409951137-9">)</span><span·class="w">
433 ··························</span><span·class="p"·data-group-id="1627905383-10">(</span><span·class="n">ChA</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DiA</span><span·class="p"·data-group-id="1627905383-10">)</span><span·class="w">433 ··························</span><span·class="p"·data-group-id="6409951137-10">(</span><span·class="n">ChA</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DiA</span><span·class="p"·data-group-id="6409951137-10">)</span><span·class="w">
434 </span><span·class="ss">send_challenge_reply</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">434 </span><span·class="ss">send_challenge_reply</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">
435 ···················································</span><span·class="ss">recv_challenge_reply</span><span·class="w">435 ···················································</span><span·class="ss">recv_challenge_reply</span><span·class="w">
436 ···················································</span><span·class="n">ICB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">in_cookie</span><span·class="p"·data-group-id="1627905383-11">(</span><span·class="n">A</span><span·class="p"·data-group-id="1627905383-11">)</span><span·class="p">,</span><span·class="w">436 ···················································</span><span·class="n">ICB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">in_cookie</span><span·class="p"·data-group-id="6409951137-11">(</span><span·class="n">A</span><span·class="p"·data-group-id="6409951137-11">)</span><span·class="p">,</span><span·class="w">
437 ···················································</span><span·class="nc">check</span><span·class="p">:</span><span·class="w">437 ···················································</span><span·class="nc">check</span><span·class="p">:</span><span·class="w">
438 ···················································</span><span·class="n">DiA</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="w">·</span><span·class="p"·data-group-id="1627905383-12">(</span><span·class="n">ChB</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ICB</span><span·class="p"·data-group-id="1627905383-12">)</span><span·class="o">?</span><span·class="w">438 ···················································</span><span·class="n">DiA</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="w">·</span><span·class="p"·data-group-id="6409951137-12">(</span><span·class="n">ChB</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ICB</span><span·class="p"·data-group-id="6409951137-12">)</span><span·class="o">?</span><span·class="w">
439 </span><span·class="w">···················································</span><span·class="p">-</span><span·class="w">·</span><span·class="na">if</span><span·class="w">·</span><span·class="n">OK</span><span·class="p">:</span><span·class="w">439 </span><span·class="w">···················································</span><span·class="p">-</span><span·class="w">·</span><span·class="na">if</span><span·class="w">·</span><span·class="n">OK</span><span·class="p">:</span><span·class="w">
440 ····················································</span><span·class="n">OCB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">out_cookie</span><span·class="p"·data-group-id="1627905383-13">(</span><span·class="n">A</span><span·class="p"·data-group-id="1627905383-13">)</span><span·class="p">,</span><span·class="w">440 ····················································</span><span·class="n">OCB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">out_cookie</span><span·class="p"·data-group-id="6409951137-13">(</span><span·class="n">A</span><span·class="p"·data-group-id="6409951137-13">)</span><span·class="p">,</span><span·class="w">
441 ····················································</span><span·class="n">DiB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="w">·</span><span·class="p"·data-group-id="1627905383-14">(</span><span·class="n">ChA</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OCB</span><span·class="p"·data-group-id="1627905383-14">)</span><span·class="w">441 ····················································</span><span·class="n">DiB</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="w">·</span><span·class="p"·data-group-id="6409951137-14">(</span><span·class="n">ChA</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OCB</span><span·class="p"·data-group-id="6409951137-14">)</span><span·class="w">
442 ··························</span><span·class="p"·data-group-id="1627905383-15">(</span><span·class="n">DiB</span><span·class="p"·data-group-id="1627905383-15">)</span><span·class="w">442 ··························</span><span·class="p"·data-group-id="6409951137-15">(</span><span·class="n">DiB</span><span·class="p"·data-group-id="6409951137-15">)</span><span·class="w">
443 ··</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="w">·</span><span·class="ss">send_challenge_ack</span><span·class="w">443 ··</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="w">·</span><span·class="ss">send_challenge_ack</span><span·class="w">
444 </span><span·class="ss">recv_challenge_ack</span><span·class="w">··································</span><span·class="n">DONE</span><span·class="w">444 </span><span·class="ss">recv_challenge_ack</span><span·class="w">··································</span><span·class="n">DONE</span><span·class="w">
445 </span><span·class="n">ICA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">in_cookie</span><span·class="p"·data-group-id="1627905383-16">(</span><span·class="n">B</span><span·class="p"·data-group-id="1627905383-16">)</span><span·class="p">,</span><span·class="w">································</span><span·class="o">-</span><span·class="w">·</span><span·class="nc">else</span><span·class="p">:</span><span·class="w">445 </span><span·class="n">ICA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">in_cookie</span><span·class="p"·data-group-id="6409951137-16">(</span><span·class="n">B</span><span·class="p"·data-group-id="6409951137-16">)</span><span·class="p">,</span><span·class="w">································</span><span·class="o">-</span><span·class="w">·</span><span·class="nc">else</span><span·class="p">:</span><span·class="w">
446 </span><span·class="nc">check</span><span·class="p">:</span><span·class="w">··············································</span><span·class="n">CLOSE</span><span·class="w">446 </span><span·class="nc">check</span><span·class="p">:</span><span·class="w">··············································</span><span·class="n">CLOSE</span><span·class="w">
447 </span><span·class="n">DiB</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="p"·data-group-id="1627905383-17">(</span><span·class="n">ChA</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ICA</span><span·class="p"·data-group-id="1627905383-17">)</span><span·class="o">?</span><span·class="w">447 </span><span·class="n">DiB</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="nf">gen_digest</span><span·class="p"·data-group-id="6409951137-17">(</span><span·class="n">ChA</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ICA</span><span·class="p"·data-group-id="6409951137-17">)</span><span·class="o">?</span><span·class="w">
448 </span><span·class="p">-</span><span·class="w">·</span><span·class="na">if</span><span·class="w">·</span><span·class="n">OK</span><span·class="p">:</span><span·class="w">448 </span><span·class="p">-</span><span·class="w">·</span><span·class="na">if</span><span·class="w">·</span><span·class="n">OK</span><span·class="p">:</span><span·class="w">
449 ·</span><span·class="n">DONE</span><span·class="w">449 ·</span><span·class="n">DONE</span><span·class="w">
450 </span><span·class="p">-</span><span·class="w">·</span><span·class="na">else</span><span·class="p">:</span><span·class="w">450 </span><span·class="p">-</span><span·class="w">·</span><span·class="na">else</span><span·class="p">:</span><span·class="w">
451 ·</span><span·class="n">CLOSE</span></code></pre><p><a·href=""·id="dflags"></a></p><h3·id="distribution-flags"·class="section-heading">451 ·</span><span·class="n">CLOSE</span></code></pre><p><a·href=""·id="dflags"></a></p><h3·id="distribution-flags"·class="section-heading">
452 ··<a·href="#distribution-flags"·class="hover-link">452 ··<a·href="#distribution-flags"·class="hover-link">
453 ····<i·class="ri-link-m"·aria-hidden="true"></i>453 ····<i·class="ri-link-m"·aria-hidden="true"></i>
454 ··</a>454 ··</a>
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762 ······<p·class="built-using">762 ······<p·class="built-using">
763 ········Built·using763 ········Built·using
764 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the764 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
765 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>765 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
766 ······</p>766 ······</p>
767 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>767 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
768 ····</footer>768 ····</footer>
769 ··</div>769 ··</div>
770 </main>770 </main>
771 </div>771 </div>
772 <script>772 <script>
773 ··function·mermaidLoaded()·{773 ··function·mermaidLoaded()·{
774 ····mermaid.initialize({774 ····mermaid.initialize({
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1773 ······<p·class="built-using">1773 ······<p·class="built-using">
1774 ········Built·using1774 ········Built·using
1775 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1775 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1776 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1776 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1777 ······</p>1777 ······</p>
1778 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1778 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1779 ····</footer>1779 ····</footer>
1780 ··</div>1780 ··</div>
1781 </main>1781 </main>
1782 </div>1782 </div>
1783 <script>1783 <script>
1784 ··function·mermaidLoaded()·{1784 ··function·mermaidLoaded()·{
1785 ····mermaid.initialize({1785 ····mermaid.initialize({
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436 ··</a>436 ··</a>
437 ··<span·class="text">SMALL_BIG_EXT</span>437 ··<span·class="text">SMALL_BIG_EXT</span>
438 </h2>438 </h2>
439 <table><thead><tr><th·style="text-align:·left;">1</th><th·style="text-align:·left;">1</th><th·style="text-align:·left;">1</th><th·style="text-align:·left;">n</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">110</code></td><td·style="text-align:·left;"><code·class="inline">n</code></td><td·style="text-align:·left;"><code·class="inline">Sign</code></td><td·style="text-align:·left;"><code·class="inline">d(0)</code>·...·<code·class="inline">d(n-1)</code></td></tr></tbody></table><p>Bignums·are·stored·in·unary·form·with·a·<code·class="inline">Sign</code>·byte,·that·is,·0·if·the·bignum·is439 <table><thead><tr><th·style="text-align:·left;">1</th><th·style="text-align:·left;">1</th><th·style="text-align:·left;">1</th><th·style="text-align:·left;">n</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">110</code></td><td·style="text-align:·left;"><code·class="inline">n</code></td><td·style="text-align:·left;"><code·class="inline">Sign</code></td><td·style="text-align:·left;"><code·class="inline">d(0)</code>·...·<code·class="inline">d(n-1)</code></td></tr></tbody></table><p>Bignums·are·stored·in·unary·form·with·a·<code·class="inline">Sign</code>·byte,·that·is,·0·if·the·bignum·is
440 positive·and·1·if·it·is·negative.·The·digits·are·stored·with·the·least440 positive·and·1·if·it·is·negative.·The·digits·are·stored·with·the·least
441 significant·byte·stored·first.·To·calculate·the·integer,·the·following·formula441 significant·byte·stored·first.·To·calculate·the·integer,·the·following·formula
442 can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">256</span><span·class="w">442 can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">256</span><span·class="w">
443 </span><span·class="p"·data-group-id="1574751371-1">(</span><span·class="ss">d0</span><span·class="o">*</span><span·class="n">B</span><span·class="err">^</span><span·class="mi">0</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="ss">d1</span><span·class[·...·truncated·by·diffoscope;·len:·952,·SHA:·539e4b3c145efe92eb5a5c494fc5e91270fce8ff6f9920909ac1123123e5fc7b·...·]-1">)</span></code></pre><h2·id="large_big_ext"·class="section-heading">443 </span><span·class="p"·data-group-id="2809065400-1">(</span><span·class="ss">d0</span><span·class="o">*</span><span·class="n">B</span><span·class="err">^</span><span·class="mi">0</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="ss">d1</span><span·class[·...·truncated·by·diffoscope;·len:·952,·SHA:·f6fb483c42ea5ea18e8f6c4204d64b3ddd6a947a24160bd06940bc19fe049bc9·...·]-1">)</span></code></pre><h2·id="large_big_ext"·class="section-heading">
444 ··<a·href="#large_big_ext"·class="hover-link">444 ··<a·href="#large_big_ext"·class="hover-link">
445 ····<i·class="ri-link-m"·aria-hidden="true"></i>445 ····<i·class="ri-link-m"·aria-hidden="true"></i>
446 ··</a>446 ··</a>
447 ··<span·class="text">LARGE_BIG_EXT</span>447 ··<span·class="text">LARGE_BIG_EXT</span>
448 </h2>448 </h2>
449 <table><thead><tr><th·style="text-align:·left;">1</th><th·style="text-align:·left;">4</th><th·style="text-align:·left;">1</th><th·style="text-align:·left;">n</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">111</code></td><td·style="text-align:·left;"><code·class="inline">n</code></td><td·style="text-align:·left;"><code·class="inline">Sign</code></td><td·style="text-align:·left;"><code·class="inline">d(0)</code>·...·<code·class="inline">d(n-1)</code></td></tr></tbody></table><p>Same·as·<a·href="erl_ext_dist.html#small_big_ext"><code·class="inline">SMALL_BIG_EXT</code></a>·except·that·the·length449 <table><thead><tr><th·style="text-align:·left;">1</th><th·style="text-align:·left;">4</th><th·style="text-align:·left;">1</th><th·style="text-align:·left;">n</th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">111</code></td><td·style="text-align:·left;"><code·class="inline">n</code></td><td·style="text-align:·left;"><code·class="inline">Sign</code></td><td·style="text-align:·left;"><code·class="inline">d(0)</code>·...·<code·class="inline">d(n-1)</code></td></tr></tbody></table><p>Same·as·<a·href="erl_ext_dist.html#small_big_ext"><code·class="inline">SMALL_BIG_EXT</code></a>·except·that·the·length
450 field·is·an·unsigned·4·byte·integer.</p><h2·id="reference_ext-deprecated"·class="section-heading">450 field·is·an·unsigned·4·byte·integer.</p><h2·id="reference_ext-deprecated"·class="section-heading">
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621 ······<p·class="built-using">621 ······<p·class="built-using">
622 ········Built·using622 ········Built·using
623 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the623 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
624 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>624 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
625 ······</p>625 ······</p>
626 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>626 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
627 ····</footer>627 ····</footer>
628 ··</div>628 ··</div>
629 </main>629 </main>
630 </div>630 </div>
631 <script>631 <script>
632 ··function·mermaidLoaded()·{632 ··function·mermaidLoaded()·{
633 ····mermaid.initialize({633 ····mermaid.initialize({
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161 }161 }
  
162 static·ErlNifFunc·nif_funcs[]·=162 static·ErlNifFunc·nif_funcs[]·=
163 {163 {
164 ····{&quot;hello&quot;,·0,·hello}164 ····{&quot;hello&quot;,·0,·hello}
165 };165 };
  
166 ERL_NIF_INIT(niftest,nif_funcs,NULL,NULL,NULL,NULL)</code></pre><p>The·Erlang·module·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2889749654-1">(</span><span·class="ss">niftest</span><span·class="p"·data-group-id="2889749654-1">)</span><span·class="p">.</span><span·class="w">166 ERL_NIF_INIT(niftest,nif_funcs,NULL,NULL,NULL,NULL)</code></pre><p>The·Erlang·module·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6112270807-1">(</span><span·class="ss">niftest</span><span·class="p"·data-group-id="6112270807-1">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="w">167 </span><span·class="w">
168 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2889749654-2">(</span><span·class="p"·data-group-id="2889749654-3">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hello</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·b396249dd3c576f05484e2cde5e3c362dcd645779fe84390f6847e3539a7cc97·...·]-2">)</span><span·class="p">.</span><span·class="w">168 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6112270807-2">(</span><span·class="p"·data-group-id="6112270807-3">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hello</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·3b4eb50dfdb7f88a56dd7d7c6f3ac897dad0956b5d12165545aa0c8e435039a6·...·]-2">)</span><span·class="p">.</span><span·class="w">
169 </span><span·class="w">169 </span><span·class="w">
170 </span><span·class="p">-</span><span·class="na">nifs</span><span·class="p"·data-group-id="2889749654-4">(</span><span·class="p"·data-group-id="2889749654-5">[</span><span·class="ss">hello</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2889749654-5">]</span><span·class="p"·data-group-id="2889749654-4">)</span><span·class="p">.</span><span·class="w">170 </span><span·class="p">-</span><span·class="na">nifs</span><span·class="p"·data-group-id="6112270807-4">(</span><span·class="p"·data-group-id="6112270807-5">[</span><span·class="ss">hello</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6112270807-5">]</span><span·class="p"·data-group-id="6112270807-4">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="w">171 </span><span·class="w">
172 </span><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="2889749654-6">(</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2889749654-6">)</span><span·class="p">.</span><span·class="w">172 </span><span·class="p">-</span><span·class="na">on_load</span><span·class="p"·data-group-id="6112270807-6">(</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6112270807-6">)</span><span·class="p">.</span><span·class="w">
  
173 </span><span·class="nf">init</span><span·class="p"·data-group-id="2889749654-7">(</span><span·class="p"·data-group-id="2889749654-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="nf">init</span><span·class="p"·data-group-id="6112270807-7">(</span><span·class="p"·data-group-id="6112270807-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ······</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="2889749654-8">(</span><span·class="s">&quot;./niftest&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="2889749654-8">)</span><span·class="p">.</span><span·class="w">174 ······</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="6112270807-8">(</span><span·class="s">&quot;./niftest&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="6112270807-8">)</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="nf">hello</span><span·class="p"·data-group-id="2889749654-9">(</span><span·class="p"·data-group-id="2889749654-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 </span><span·class="nf">hello</span><span·class="p"·data-group-id="6112270807-9">(</span><span·class="p"·data-group-id="6112270807-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ······</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">nif_error</span><span·class="p"·data-group-id="2889749654-10">(</span><span·class="s">&quot;NIF·library·not·loaded&quot;</span><span·class="p"·data-group-id="2889749654-10">)</span><span·class="p">.</span></code></pre><p>Compile·and·test·can·look·as·follows·(on·Linux):</p><pre><code·class="text">$&gt;·gcc·-fPIC·-shared·-o·niftest.so·niftest.c·-I·$ERL_ROOT/usr/include/176 ······</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">nif_error</span><span·class="p"·data-group-id="6112270807-10">(</span><span·class="s">&quot;NIF·library·not·loaded&quot;</span><span·class="p"·data-group-id="6112270807-10">)</span><span·class="p">.</span></code></pre><p>Compile·and·test·can·look·as·follows·(on·Linux):</p><pre><code·class="text">$&gt;·gcc·-fPIC·-shared·-o·niftest.so·niftest.c·-I·$ERL_ROOT/usr/include/
177 $&gt;·erl177 $&gt;·erl
  
178 1&gt;·c(niftest).178 1&gt;·c(niftest).
179 {ok,niftest}179 {ok,niftest}
180 2&gt;·niftest:hello().180 2&gt;·niftest:hello().
181 &quot;Hello·world!&quot;</code></pre><p>In·the·example·above·the·<a·href="../../../doc/system/code_loading.html#on_load"><em><code·class="inline">on_load</code></em></a>181 &quot;Hello·world!&quot;</code></pre><p>In·the·example·above·the·<a·href="../../../doc/system/code_loading.html#on_load"><em><code·class="inline">on_load</code></em></a>
182 directive·is·used·get·function·<code·class="inline">init</code>·called·automatically·when·the·module·is182 directive·is·used·get·function·<code·class="inline">init</code>·called·automatically·when·the·module·is
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2873 ······<p·class="built-using">2873 ······<p·class="built-using">
2874 ········Built·using2874 ········Built·using
2875 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2875 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2876 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2876 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2877 ······</p>2877 ······</p>
2878 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2878 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2879 ····</footer>2879 ····</footer>
2880 ··</div>2880 ··</div>
2881 </main>2881 </main>
2882 </div>2882 </div>
2883 <script>2883 <script>
2884 ··function·mermaidLoaded()·{2884 ··function·mermaidLoaded()·{
2885 ····mermaid.initialize({2885 ····mermaid.initialize({
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398 ························when·Filename·::·<a·href="erlang.html#t:string/0">string</a>(),·FileInfo·::·<a·href="../../../lib/kernel-10.2.6/doc/html/file.html#t:file_info/0">file:file_info</a>().</pre>398 ························when·Filename·::·<a·href="erlang.html#t:string/0">string</a>(),·FileInfo·::·<a·href="../../../lib/kernel-10.2.6/doc/html/file.html#t:file_info/0">file:file_info</a>().</pre>
  
399 ······</div>399 ······</div>
  
400 <p>Retrieves·information·about·a·file.</p><p>Returns·<code·class="inline">{ok,·FileInfo}</code>·if·successful,·otherwise·<code·class="inline">error</code>.·<code·class="inline">FileInfo</code>·is·a400 <p>Retrieves·information·about·a·file.</p><p>Returns·<code·class="inline">{ok,·FileInfo}</code>·if·successful,·otherwise·<code·class="inline">error</code>.·<code·class="inline">FileInfo</code>·is·a
401 record·<a·href="../../../lib/kernel-10.2.6/doc/html/file.html#t:file_info/0"><code·class="inline">file_info</code></a>,·defined·in·the·Kernel·include·file401 record·<a·href="../../../lib/kernel-10.2.6/doc/html/file.html#t:file_info/0"><code·class="inline">file_info</code></a>,·defined·in·the·Kernel·include·file
402 ·<code·class="inline">file.hrl</code>.·Include·the·following·directive·in·the·module·from·which·the402 ·<code·class="inline">file.hrl</code>.·Include·the·following·directive·in·the·module·from·which·the
403 function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2051366568-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="2051366568-1">)</span><span·class="p">.</span></code></pre><p>For·more·information·about·the·record·see·<a·href="../../../lib/kernel-10.2.6/doc/html/file.html#read_file_info/2"><code·class="inline">file:read_file_info/2</code></a>.</p><p><code·class="inline">Filename</code>·can·also·be·a·file·in·an·archive,·for·example,403 function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2134725581-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="2134725581-1">)</span><span·class="p">.</span></code></pre><p>For·more·information·about·the·record·see·<a·href="../../../lib/kernel-10.2.6/doc/html/file.html#read_file_info/2"><code·class="inline">file:read_file_info/2</code></a>.</p><p><code·class="inline">Filename</code>·can·also·be·a·file·in·an·archive,·for·example,
404 <code·class="inline">$OTPROOT/lib/mnesia-4.4.7.ez/mnesia-4.4.7/ebin/mnesia</code>.·For·information404 <code·class="inline">$OTPROOT/lib/mnesia-4.4.7.ez/mnesia-4.4.7/ebin/mnesia</code>.·For·information
405 about·archive·files,·see·<a·href="../../../lib/kernel-10.2.6/doc/html/code.html"><code·class="inline">code</code></a>.</p>405 about·archive·files,·see·<a·href="../../../lib/kernel-10.2.6/doc/html/code.html"><code·class="inline">code</code></a>.</p>
406 ··</section>406 ··</section>
407 </section>407 </section>
408 <section·class="detail"·id="read_link_info/1">408 <section·class="detail"·id="read_link_info/1">
  
409 ··<div·class="detail-header">409 ··<div·class="detail-header">
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486 ······<p·class="built-using">486 ······<p·class="built-using">
487 ········Built·using487 ········Built·using
488 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the488 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
489 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>489 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
490 ······</p>490 ······</p>
491 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>491 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
492 ····</footer>492 ····</footer>
493 ··</div>493 ··</div>
494 </main>494 </main>
495 </div>495 </div>
496 <script>496 <script>
497 ··function·mermaidLoaded()·{497 ··function·mermaidLoaded()·{
498 ····mermaid.initialize({498 ····mermaid.initialize({
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145 ··<span·class="text">Erl·Tracer·Module·Example</span>145 ··<span·class="text">Erl·Tracer·Module·Example</span>
146 </h2>146 </h2>
147 <p>In·this·example,·a·tracer·module·with·a·NIF·back·end·sends·a·message·for·each147 <p>In·this·example,·a·tracer·module·with·a·NIF·back·end·sends·a·message·for·each
148 <code·class="inline">send</code>·trace·tag·containing·only·the·sender·and·receiver.·Using·this·tracer148 <code·class="inline">send</code>·trace·tag·containing·only·the·sender·and·receiver.·Using·this·tracer
149 module,·a·much·more·lightweight·message·tracer·is·used,·which·only·records·who149 module,·a·much·more·lightweight·message·tracer·is·used,·which·only·records·who
150 sent·messages·to·who.</p><p>The·following·is·an·example·session·using·it·on·Linux:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">gcc</span><span·class="w">·</span><span·class="o">-</span><span·class="n">I</span><span·class="w">·</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">8.0</span><span·class="o">/</span><span·class="ss">include</span><span·class="o">/</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">fPIC</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">shared</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">o</span><span·class="w">·</span><span·class="ss">erl_msg_tracer</span><span·class="p">.</span><span·class="ss">so</span><span·class="w">·</span><span·class="ss">erl_msg_tracer</span><span·class="p">.</span><span·class="ss">c</span><span·class="w">150 sent·messages·to·who.</p><p>The·following·is·an·example·session·using·it·on·Linux:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">gcc</span><span·class="w">·</span><span·class="o">-</span><span·class="n">I</span><span·class="w">·</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">8.0</span><span·class="o">/</span><span·class="ss">include</span><span·class="o">/</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">fPIC</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">shared</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">o</span><span·class="w">·</span><span·class="ss">erl_msg_tracer</span><span·class="p">.</span><span·class="ss">so</span><span·class="w">·</span><span·class="ss">erl_msg_tracer</span><span·class="p">.</span><span·class="ss">c</span><span·class="w">
151 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">151 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">
152 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">19</span><span·class="w">·</span><span·class="p"·data-group-id="9260341501-1">[</span><span·class="n">DEVELOPMENT</span><span·class="p"·data-group-id="9260341501-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="9260341501-2">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">8[·...·truncated·by·diffoscope;·len:·1413,·SHA:·31b8806a7d2b6fbf01c8c9d06b9613cef26fc58bfdaf7e2044d7feac8b727d5e·...·]1-8">]</span><span·class="w">152 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">19</span><span·class="w">·</span><span·class="p"·data-group-id="0103408721-1">[</span><span·class="n">DEVELOPMENT</span><span·class="p"·data-group-id="0103408721-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="0103408721-2">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">8[·...·truncated·by·diffoscope;·len:·1413,·SHA:·91b50ca906c17424c863f59ec68dc32dd0f7721cf3b5badd5bd30cf0dcc8ed4f·...·]1-8">]</span><span·class="w">
  
153 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V8</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">··</span><span·class="p"·data-group-id="9260341501-9">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="9260341501-9">)</span><span·class="gp·unselectable">153 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V8</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">··</span><span·class="p"·data-group-id="0103408721-9">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0103408721-9">)</span><span·class="gp·unselectable">
154 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="9260341501-10">(</span><span·class="ss">erl_msg_tracer</span><span·class="p"·data-group-id="9260341501-10">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">erl_msg_tracer</span><span·class="p">:</span><span·class="nf">load</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·8398ddc2ac98bf379ce5e28dfd6602fad746572091ec80c90c9668acfce652ac·...·]1-11">)</span><span·class="p">.</span><span·class="w">154 1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="0103408721-10">(</span><span·class="ss">erl_msg_tracer</span><span·class="p"·data-group-id="0103408721-10">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">erl_msg_tracer</span><span·class="p">:</span><span·class="nf">load</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·5d91387d273690de1b129ee91b25420bcf09acf72b5e535cfc2ee7cd357c7296·...·]1-11">)</span><span·class="p">.</span><span·class="w">
155 </span><span·class="ss">ok</span><span·class="gp·unselectable">155 </span><span·class="ss">ok</span><span·class="gp·unselectable">
156 2&gt;·</span><span·class="n">Tracer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="9260341501-12">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="9260341501-13">(</span><span·class="p"·data-group-id="9260341501-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span[·...·truncated·by·diffoscope;·len:·953,·SHA:·b8d94c2c7599c402a27581286c12fd0efbeeb546a9d8a5585818c072c0184d7e·...·]1-12">)</span><span·class="p">.</span><span·class="w">156 2&gt;·</span><span·class="n">Tracer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="0103408721-12">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="0103408721-13">(</span><span·class="p"·data-group-id="0103408721-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span[·...·truncated·by·diffoscope;·len:·953,·SHA:·1a0750dda251aa7a761d4aed66592a3fffcefb759bd6ea61b80bfc207af4bae6·...·]1-12">)</span><span·class="p">.</span><span·class="w">
157 </span><span·class="o">&lt;</span><span·class="mf">0.37</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">157 </span><span·class="o">&lt;</span><span·class="mf">0.37</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
158 3&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="9260341501-17">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9260341501-18">[</span><span·class="nb">send</span>[·...·truncated·by·diffoscope;·len:·419,·SHA:·00b0098c50ea06ef8d9a54b8caa300f73812ff82d5badefb9c9591d94b19ce08·...·]1-17">)</span><span·class="p">.</span><span·class="w">158 3&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="0103408721-17">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0103408721-18">[</span><span·class="nb">send</span>[·...·truncated·by·diffoscope;·len:·419,·SHA:·15e9a43378bb00f53ac914c81a15d89fb672522a042491f23bdfeb86933f56f6·...·]1-17">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="mi">0</span><span·class="w">159 </span><span·class="mi">0</span><span·class="w">
160 </span><span·class="p"·data-group-id="9260341501-20">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.39</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</spa[·...·truncated·by·diffoscope;·len:·146,·SHA:·d66c62f6c2b6d1c3e6ed5452286eb7e6fd8861cf07dae484e42e87929c1243ed·...·]1-20">}</span><span·class="gp·unselectable">160 </span><span·class="p"·data-group-id="0103408721-20">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.39</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</spa[·...·truncated·by·diffoscope;·len:·146,·SHA:·4ed229c41016bbc396b5a07d4ceb1506b8e2fe97cfba2e820958fb69179803e3·...·]1-20">}</span><span·class="gp·unselectable">
161 4&gt;·</span><span·class="p"·data-group-id="9260341501-21">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D</span><span·class="p"·data-group-id="9260341501-21">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·374,·SHA:·9fd113d4f390d428aaa32e2c536d98243e3d9b4d710b40b820ef3005d5f88403·...·]1-22">)</span><span·class="p">.</span><span·class="w">161 4&gt;·</span><span·class="p"·data-group-id="0103408721-21">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D</span><span·class="p"·data-group-id="0103408721-21">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·374,·SHA:·5d8de03505b3aaad30faeaf70e605f452d356f70df77f8827d44e59a23fef522·...·]1-22">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="p"·data-group-id="9260341501-24">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.486</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·149,·SHA:·d9d51d828bc0d0f08fd370dfe2c607d1954dd2d45119ee0b95c2bf42b0b5b348·...·]1-24">}</span><span·class="w">162 </span><span·class="p"·data-group-id="0103408721-24">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.486</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·149,·SHA:·dbf856160ab439d3ca1feb87e9ddaf34fbe3f6341f5c4d19e54f9ab3e08235b0·...·]1-24">}</span><span·class="w">
163 </span><span·class="p"·data-group-id="9260341501-25">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</spa[·...·truncated·by·diffoscope;·len:·146,·SHA:·f15b672a8b00675dfa44320dcd5b72ac153adca782897210b24c1be423a540be·...·]1-25">}</span><span·class="w">163 </span><span·class="p"·data-group-id="0103408721-25">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</spa[·...·truncated·by·diffoscope;·len:·146,·SHA:·d1f94c5be11e571ee18b611349110a4e69458d8c48670c5fc1ca7266dd2dfd5d·...·]1-25">}</span><span·class="w">
164 </span><span·class="p"·data-group-id="9260341501-26">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.487</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·0b1d43644c24f638153cdfe63d5d08ed43cca10d254ffa03af4f90862717a27b·...·]1-26">}</span><span·class="w">164 </span><span·class="p"·data-group-id="0103408721-26">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.487</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·c02ead4c1a631a273991509f4ccf6edf1e4d58df2062e245018347460b1aa2fe·...·]1-26">}</span><span·class="w">
165 </span><span·class="p"·data-group-id="9260341501-27">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.488</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·0b1d43644c24f638153cdfe63d5d08ed43cca10d254ffa03af4f90862717a27b·...·]1-27">}</span><span·class="w">165 </span><span·class="p"·data-group-id="0103408721-27">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.488</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·c02ead4c1a631a273991509f4ccf6edf1e4d58df2062e245018347460b1aa2fe·...·]1-27">}</span><span·class="w">
166 </span><span·class="p"·data-group-id="9260341501-28">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.489</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·0b1d43644c24f638153cdfe63d5d08ed43cca10d254ffa03af4f90862717a27b·...·]1-28">}</span><span·class="w">166 </span><span·class="p"·data-group-id="0103408721-28">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.489</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·c02ead4c1a631a273991509f4ccf6edf1e4d58df2062e245018347460b1aa2fe·...·]1-28">}</span><span·class="w">
167 </span><span·class="p"·data-group-id="9260341501-29">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.490</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·0b1d43644c24f638153cdfe63d5d08ed43cca10d254ffa03af4f90862717a27b·...·]1-29">}</span><span·class="w">167 </span><span·class="p"·data-group-id="0103408721-29">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Port</span><span·class="o">&lt;</span><span·class="mf">0.490</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</[·...·truncated·by·diffoscope;·len:·148,·SHA:·c02ead4c1a631a273991509f4ccf6edf1e4d58df2062e245018347460b1aa2fe·...·]1-29">}</span><span·class="w">
168 </span><span·class="p"·data-group-id="9260341501-30">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="9260341501-30">}</span><span·class="w">168 </span><span·class="p"·data-group-id="0103408721-30">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0103408721-30">}</span><span·class="w">
169 </span><span·class="p"·data-group-id="9260341501-31">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.41</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</spa[·...·truncated·by·diffoscope;·len:·146,·SHA:·d66c62f6c2b6d1c3e6ed5452286eb7e6fd8861cf07dae484e42e87929c1243ed·...·]1-31">}</span><span·class="w">169 </span><span·class="p"·data-group-id="0103408721-31">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.41</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</spa[·...·truncated·by·diffoscope;·len:·146,·SHA:·4ed229c41016bbc396b5a07d4ceb1506b8e2fe97cfba2e820958fb69179803e3·...·]1-31">}</span><span·class="w">
170 </span><span·class="mi">5</span><span·class="o">&gt;</span></code></pre><p><code·class="inline">erl_msg_tracer.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9923963868-1">(</span><span·class="ss">erl_msg_tracer</span><span·class="p"·data-group-id="9923963868-1">)</span><span·class="p">.</span><span·class="w">170 </span><span·class="mi">5</span><span·class="o">&gt;</span></code></pre><p><code·class="inline">erl_msg_tracer.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6874345128-1">(</span><span·class="ss">erl_msg_tracer</span><span·class="p"·data-group-id="6874345128-1">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="w">171 </span><span·class="w">
172 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9923963868-2">(</span><span·class="p"·data-group-id="9923963868-3">[</span><span·class="ss">enabled</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="nb">trace</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·243,·SHA:·1770a904f1d4cc50de5e1b1d80cf015d15062a603dc36afded1eb2dfd97d123d·...·]8-2">)</span><span·class="p">.</span><span·class="w">172 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6874345128-2">(</span><span·class="p"·data-group-id="6874345128-3">[</span><span·class="ss">enabled</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="nb">trace</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·243,·SHA:·3f9d591b7339c3bff0aa31ad7a3f21a08d48269536dd5faedd0c0791c57b8dbf·...·]8-2">)</span><span·class="p">.</span><span·class="w">
  
173 </span><span·class="nf">load</span><span·class="p"·data-group-id="9923963868-4">(</span><span·class="p"·data-group-id="9923963868-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="nf">load</span><span·class="p"·data-group-id="6874345128-4">(</span><span·class="p"·data-group-id="6874345128-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="9923963868-5">(</span><span·class="s">&quot;erl_msg_tracer&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9923963868-6">[</span><span·class="p"·data-group-id="9923963868-6">]</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·9,·SHA:·668c90df8979d97f2c86cd405309494ecff346d1e20993bd0d6eb9b9a266a455·...·]8-5">)</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">load_nif</span><span·class="p"·data-group-id="6874345128-5">(</span><span·class="s">&quot;erl_msg_tracer&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6874345128-6">[</span><span·class="p"·data-group-id="6874345128-6">]</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·9,·SHA:·1a29b862027c14ebfb6662994a20626e7658879a07ca3f307e5989aa8f663076·...·]8-5">)</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="nf">enabled</span><span·class="p"·data-group-id="9923963868-7">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="9923963868-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 </span><span·class="nf">enabled</span><span·class="p"·data-group-id="6874345128-7">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="6874345128-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ····</span><span·class="ss">error</span><span·class="p">.</span><span·class="w">176 ····</span><span·class="ss">error</span><span·class="p">.</span><span·class="w">
  
177 </span><span·class="nf">trace</span><span·class="p"·data-group-id="9923963868-8">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_<[·...·truncated·by·diffoscope;·len:·118,·SHA:·1b6f1a0da66741ad5700442a3515ab35a87db570800b928de884e4a9175a32e2·...·]8-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">177 </span><span·class="nf">trace</span><span·class="p"·data-group-id="6874345128-8">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_<[·...·truncated·by·diffoscope;·len:·118,·SHA:·c0a8cceaa583358f757edb2a7c94657527c646c4f8fb0c727283f5f2844fa21d·...·]8-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
178 ····</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p><code·class="inline">erl_msg_tracer.c</code>:</p><pre><code·class="c">#include·&lt;erl_nif.h&gt;178 ····</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p><code·class="inline">erl_msg_tracer.c</code>:</p><pre><code·class="c">#include·&lt;erl_nif.h&gt;
  
179 /*·NIF·interface·declarations·*/179 /*·NIF·interface·declarations·*/
180 static·int·load(ErlNifEnv*·env,·void**·priv_data,·ERL_NIF_TERM·load_info);180 static·int·load(ErlNifEnv*·env,·void**·priv_data,·ERL_NIF_TERM·load_info);
181 static·int·upgrade(ErlNifEnv*·env,·void**·priv_data,·void**·old_priv_data,·ERL_NIF_TERM·load_info);181 static·int·upgrade(ErlNifEnv*·env,·void**·priv_data,·void**·old_priv_data,·ERL_NIF_TERM·load_info);
182 static·void·unload(ErlNifEnv*·env,·void*·priv_data);182 static·void·unload(ErlNifEnv*·env,·void*·priv_data);
  
Offset 1657, 15 lines modifiedOffset 1657, 15 lines modified
1657 ······<p·class="built-using">1657 ······<p·class="built-using">
1658 ········Built·using1658 ········Built·using
1659 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1659 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1660 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1660 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1661 ······</p>1661 ······</p>
1662 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1662 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1663 ····</footer>1663 ····</footer>
1664 ··</div>1664 ··</div>
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299 ······</p>299 ······</p>
300 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>300 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
301 ····</footer>301 ····</footer>
302 ··</div>302 ··</div>
303 </main>303 </main>
304 </div>304 </div>
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407 ····</footer>407 ····</footer>
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409 </main>409 </main>
410 </div>410 </div>
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127 <p>Run·a·script·written·in·Erlang.</p><h2·id="synopsis"·class="section-heading">127 <p>Run·a·script·written·in·Erlang.</p><h2·id="synopsis"·class="section-heading">
128 ··<a·href="#synopsis"·class="hover-link">128 ··<a·href="#synopsis"·class="hover-link">
129 ····<i·class="ri-link-m"·aria-hidden="true"></i>129 ····<i·class="ri-link-m"·aria-hidden="true"></i>
130 ··</a>130 ··</a>
131 ··<span·class="text">Synopsis</span>131 ··<span·class="text">Synopsis</span>
132 </h2>132 </h2>
133 <pre><code·class="makeup·erlang"·translate="no"><span·class="ss">script</span><span·class="o">-</span><span·class="ss">name</span><span·class="w">·</span><span·class="p"·data-group-id="5788065061-1">[</span><span·class="ss">arg1</span><span·class="w">·</span><span·class="ss">arg2</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5788065061-1">]</span></code></pre><h2·id="description"·class="section-heading">133 <pre><code·class="makeup·erlang"·translate="no"><span·class="ss">script</span><span·class="o">-</span><span·class="ss">name</span><span·class="w">·</span><span·class="p"·data-group-id="0867068748-1">[</span><span·class="ss">arg1</span><span·class="w">·</span><span·class="ss">arg2</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0867068748-1">]</span></code></pre><h2·id="description"·class="section-heading">
134 ··<a·href="#description"·class="hover-link">134 ··<a·href="#description"·class="hover-link">
135 ····<i·class="ri-link-m"·aria-hidden="true"></i>135 ····<i·class="ri-link-m"·aria-hidden="true"></i>
136 ··</a>136 ··</a>
137 ··<span·class="text">Description</span>137 ··<span·class="text">Description</span>
138 </h2>138 </h2>
139 <p><code·class="inline">escript</code>·provides·support·for·running·short·Erlang·programs·without·having·to139 <p><code·class="inline">escript</code>·provides·support·for·running·short·Erlang·programs·without·having·to
140 compile·them·first,·and·an·easy·way·to·retrieve·the·command-line·arguments.140 compile·them·first,·and·an·easy·way·to·retrieve·the·command-line·arguments.
141 <code·class="inline">escript</code>s·are·created·by·either·writing·them·by·hand·or·using·<a·href="../../../lib/stdlib-6.2.2/doc/html/escript.html#create/2"><code·class="inline">escript:create/2</code></a>.</p><p>escripts·are·run·by·directly·invoking·them·(does·not·work·on·Windows):</p><pre><code·class="text">script-name·[arg1·arg2...]</code></pre><p>or·by·calling·the·<code·class="inline">escript</code>·program·(works·on·all·platforms):</p><pre><code·class="text">escript·[escript-flags]·script-name.escript·[arg1·arg2...]</code></pre><p>For·example:</p><pre><code·class="text">$·chmod·u+x·factorial141 <code·class="inline">escript</code>s·are·created·by·either·writing·them·by·hand·or·using·<a·href="../../../lib/stdlib-6.2.2/doc/html/escript.html#create/2"><code·class="inline">escript:create/2</code></a>.</p><p>escripts·are·run·by·directly·invoking·them·(does·not·work·on·Windows):</p><pre><code·class="text">script-name·[arg1·arg2...]</code></pre><p>or·by·calling·the·<code·class="inline">escript</code>·program·(works·on·all·platforms):</p><pre><code·class="text">escript·[escript-flags]·script-name.escript·[arg1·arg2...]</code></pre><p>For·example:</p><pre><code·class="text">$·chmod·u+x·factorial
142 $·cat·factorial</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="ch">#!/usr/bin/env·escript142 $·cat·factorial</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="ch">#!/usr/bin/env·escript
143 </span><span·class="c1">%%·-*-·erlang·-*-</span><span·class="w">143 </span><span·class="c1">%%·-*-·erlang·-*-</span><span·class="w">
144 </span><span·class="c1">%%!·-sname·factorial·-mnesia·debug·verbose</span><span·class="w">144 </span><span·class="c1">%%!·-sname·factorial·-mnesia·debug·verbose</span><span·class="w">
145 </span><span·class="nf">main</span><span·class="p"·data-group-id="8444781084-1">(</span><span·class="p"·data-group-id="8444781084-2">[</span><span·class="n">String</span><span·class="p"·data-group-id="8444781084-2">]</span><span·class="p"·data-group-id="8444781084-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">145 </span><span·class="nf">main</span><span·class="p"·data-group-id="3304611788-1">(</span><span·class="p"·data-group-id="3304611788-2">[</span><span·class="n">String</span><span·class="p"·data-group-id="3304611788-2">]</span><span·class="p"·data-group-id="3304611788-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
146 ····</span><span·class="k">try</span><span·class="w">146 ····</span><span·class="k">try</span><span·class="w">
147 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">list_to_integer</span><span·class="p"·data-group-id="8444781084-3">(</span><span·class="n">String</span><span·class="p"·data-group-id="8444781084-3">)</span><span·class="p">,</span><span·class="w">147 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">list_to_integer</span><span·class="p"·data-group-id="3304611788-3">(</span><span·class="n">String</span><span·class="p"·data-group-id="3304611788-3">)</span><span·class="p">,</span><span·class="w">
148 ········</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fac</span><span·class="p"·data-group-id="8444781084-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="8444781084-4">)</span><span·class="p">,</span><span·class="w">148 ········</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fac</span><span·class="p"·data-group-id="3304611788-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="3304611788-4">)</span><span·class="p">,</span><span·class="w">
149 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8444781084-5">(</span><span·class="s">&quot;factorial·</span><span·class="si">~w</span><span·class="s">·=·</span><span·class="si">~w</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8444781[·...·truncated·by·diffoscope;·len:·181,·SHA:·13332237d520e23a89e5a6d080e7a7e7a617473e72a1b2fc96e4ee5f96288424·...·]-5">)</span><span·class="w">149 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3304611788-5">(</span><span·class="s">&quot;factorial·</span><span·class="si">~w</span><span·class="s">·=·</span><span·class="si">~w</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3304611[·...·truncated·by·diffoscope;·len:·181,·SHA:·22fff78673cbc24cc9e5a10a867178c0c3599a9a3e64d76786d444f569cff02d·...·]-5">)</span><span·class="w">
150 ····</span><span·class="k">catch</span><span·class="w">150 ····</span><span·class="k">catch</span><span·class="w">
151 ········</span><span·class="p">_</span><span·class="p">:</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">151 ········</span><span·class="p">_</span><span·class="p">:</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
152 ············</span><span·class="nf">usage</span><span·class="p"·data-group-id="8444781084-7">(</span><span·class="p"·data-group-id="8444781084-7">)</span><span·class="w">152 ············</span><span·class="nf">usage</span><span·class="p"·data-group-id="3304611788-7">(</span><span·class="p"·data-group-id="3304611788-7">)</span><span·class="w">
153 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">153 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
154 </span><span·class="nf">main</span><span·class="p"·data-group-id="8444781084-8">(</span><span·class="p">_</span><span·class="p"·data-group-id="8444781084-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">154 </span><span·class="nf">main</span><span·class="p"·data-group-id="3304611788-8">(</span><span·class="p">_</span><span·class="p"·data-group-id="3304611788-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
155 ····</span><span·class="nf">usage</span><span·class="p"·data-group-id="8444781084-9">(</span><span·class="p"·data-group-id="8444781084-9">)</span><span·class="p">.</span><span·class="w">155 ····</span><span·class="nf">usage</span><span·class="p"·data-group-id="3304611788-9">(</span><span·class="p"·data-group-id="3304611788-9">)</span><span·class="p">.</span><span·class="w">
  
156 </span><span·class="nf">usage</span><span·class="p"·data-group-id="8444781084-10">(</span><span·class="p"·data-group-id="8444781084-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 </span><span·class="nf">usage</span><span·class="p"·data-group-id="3304611788-10">(</span><span·class="p"·data-group-id="3304611788-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8444781084-11">(</span><span·class="s">&quot;usage:·factorial·integer\n&quot;</span><span·class="p"·data-group-id="8444781084-11">)</span><span·class="p">,</span><span·class="w">157 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3304611788-11">(</span><span·class="s">&quot;usage:·factorial·integer\n&quot;</span><span·class="p"·data-group-id="3304611788-11">)</span><span·class="p">,</span><span·class="w">
158 ····</span><span·class="nf">halt</span><span·class="p"·data-group-id="8444781084-12">(</span><span·class="mi">1</span><span·class="p"·data-group-id="8444781084-12">)</span><span·class="p">.</span><span·class="w">158 ····</span><span·class="nf">halt</span><span·class="p"·data-group-id="3304611788-12">(</span><span·class="mi">1</span><span·class="p"·data-group-id="3304611788-12">)</span><span·class="p">.</span><span·class="w">
  
159 </span><span·class="nf">fac</span><span·class="p"·data-group-id="8444781084-13">(</span><span·class="mi">0</span><span·class="p"·data-group-id="8444781084-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">159 </span><span·class="nf">fac</span><span·class="p"·data-group-id="3304611788-13">(</span><span·class="mi">0</span><span·class="p"·data-group-id="3304611788-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">
160 </span><span·class="nf">fac</span><span·class="p"·data-group-id="8444781084-14">(</span><span·class="n">N</span><span·class="p"·data-group-id="8444781084-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·c[·...·truncated·by·diffoscope;·len:·212,·SHA:·a9bbce989eb85fd48dfe5b1c20f672ffd8704f853adff13ea40e5684da8f9059·...·]-15">)</span><span·class="p">.</span></code></pre><pre><code·class="text">$·./factorial·5160 </span><span·class="nf">fac</span><span·class="p"·data-group-id="3304611788-14">(</span><span·class="n">N</span><span·class="p"·data-group-id="3304611788-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">*</span><span·c[·...·truncated·by·diffoscope;·len:·212,·SHA:·be356bf530b950532d508856f8d619af317629f77ad64e72817c868c5754f418·...·]-15">)</span><span·class="p">.</span></code></pre><pre><code·class="text">$·./factorial·5
161 factorial·5·=·120161 factorial·5·=·120
162 $·./factorial162 $·./factorial
163 usage:·factorial·integer163 usage:·factorial·integer
164 $·./factorial·five164 $·./factorial·five
165 usage:·factorial·integer</code></pre><p>The·header·of·the·Erlang·script·in·the·example·differs·from·a·normal·Erlang165 usage:·factorial·integer</code></pre><p>The·header·of·the·Erlang·script·in·the·example·differs·from·a·normal·Erlang
166 module.·The·first·line·is·intended·to·be·the·interpreter·line,·which·invokes166 module.·The·first·line·is·intended·to·be·the·interpreter·line,·which·invokes
167 <code·class="inline">escript</code>.</p><p>However,·if·you·invoke·the·<code·class="inline">escript</code>·as·follows,·the·contents·of·the·first·line167 <code·class="inline">escript</code>.</p><p>However,·if·you·invoke·the·<code·class="inline">escript</code>·as·follows,·the·contents·of·the·first·line
168 do·not·matter,·but·it·cannot·contain·Erlang·code·as·it·will·be·ignored:</p><pre><code·class="text">$·escript·factorial·5</code></pre><p>The·second·line·in·the·example·contains·an·optional·directive·to·the·<code·class="inline">Emacs</code>168 do·not·matter,·but·it·cannot·contain·Erlang·code·as·it·will·be·ignored:</p><pre><code·class="text">$·escript·factorial·5</code></pre><p>The·second·line·in·the·example·contains·an·optional·directive·to·the·<code·class="inline">Emacs</code>
169 editor,·which·causes·it·to·enter·the·major·mode·for·editing·Erlang·source·files.169 editor,·which·causes·it·to·enter·the·major·mode·for·editing·Erlang·source·files.
170 If·the·directive·is·present,·it·must·be·located·on·the·second·line.</p><p>If·a·comment·selecting·the·<a·href="../../../lib/stdlib-6.2.2/doc/html/epp.html#encoding">encoding</a>·exists,·it·can·be170 If·the·directive·is·present,·it·must·be·located·on·the·second·line.</p><p>If·a·comment·selecting·the·<a·href="../../../lib/stdlib-6.2.2/doc/html/epp.html#encoding">encoding</a>·exists,·it·can·be
171 located·on·the·second·line.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·encoding·specified·by·the·above·mentioned·comment·applies·to·the·script171 located·on·the·second·line.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·encoding·specified·by·the·above·mentioned·comment·applies·to·the·script
172 itself.·The·encoding·of·the·I/O-server,·however,·must·be·set·explicitly·as172 itself.·The·encoding·of·the·I/O-server,·however,·must·be·set·explicitly·as
173 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">setopts</span><span·class="p"·data-group-id="0010811333-1">(</span><span·class="p"·data-group-id="0010811333-2">[</span><span·class="p"·data-group-id="0010811333-3">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·128,·SHA:·8e036e6c09a1534938e9ee747604400aff9b143ce4dd7a56d4e4ed380c8d4b11·...·]-1">)</span></code></pre><p>The·default·encoding·of·the·I/O-server·for173 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">setopts</span><span·class="p"·data-group-id="0653583416-1">(</span><span·class="p"·data-group-id="0653583416-2">[</span><span·class="p"·data-group-id="0653583416-3">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·128,·SHA:·67317f3be2c85c485e013ddab0e34a2d444a6f6361cffb3763038ff6436bd46b·...·]-1">)</span></code></pre><p>The·default·encoding·of·the·I/O-server·for
174 <a·href="../../../lib/stdlib-6.2.2/doc/html/io.html#t:standard_io/0"><code·class="inline">standard_io</code></a>·is·<code·class="inline">unicode</code>·if·its·supported.·(see174 <a·href="../../../lib/stdlib-6.2.2/doc/html/io.html#t:standard_io/0"><code·class="inline">standard_io</code></a>·is·<code·class="inline">unicode</code>·if·its·supported.·(see
175 section175 section
176 <a·href="../../../lib/stdlib-6.2.2/doc/html/unicode_usage.html#unicode_options_summary">Summary·of·Options</a>)·in176 <a·href="../../../lib/stdlib-6.2.2/doc/html/unicode_usage.html#unicode_options_summary">Summary·of·Options</a>)·in
177 the·STDLIB·User's·Guide.</p></section><p>On·the·third·line·(or·second·line·depending·on·the·presence·of·the·Emacs177 the·STDLIB·User's·Guide.</p></section><p>On·the·third·line·(or·second·line·depending·on·the·presence·of·the·Emacs
178 directive),·arguments·can·be·specified·to·the·emulator,·for·example:</p><pre><code·class="text">%%!·-sname·factorial·-mnesia·debug·verbose</code></pre><p>Such·an·argument·line·must·start·with·<code·class="inline">%%!</code>·and·the·remaining·line·is178 directive),·arguments·can·be·specified·to·the·emulator,·for·example:</p><pre><code·class="text">%%!·-sname·factorial·-mnesia·debug·verbose</code></pre><p>Such·an·argument·line·must·start·with·<code·class="inline">%%!</code>·and·the·remaining·line·is
179 interpreted·as·arguments·to·the·emulator.</p><p>If·you·know·the·location·of·the·<code·class="inline">escript</code>·executable,·the·first·line·can179 interpreted·as·arguments·to·the·emulator.</p><p>If·you·know·the·location·of·the·<code·class="inline">escript</code>·executable,·the·first·line·can
180 directly·give·the·path·to·<code·class="inline">escript</code>,·for·example:</p><pre><code·class="text">#!/usr/local/bin/escript</code></pre><p>As·any·other·type·of·scripts,·Erlang·scripts·do·not·work·on·Unix·platforms·if180 directly·give·the·path·to·<code·class="inline">escript</code>,·for·example:</p><pre><code·class="text">#!/usr/local/bin/escript</code></pre><p>As·any·other·type·of·scripts,·Erlang·scripts·do·not·work·on·Unix·platforms·if
Offset 188, 23 lines modifiedOffset 188, 23 lines modified
188 arguments·specified·to·the·script·(not·changed·or·interpreted·in·any·way).</p><p>If·the·<code·class="inline">main/1</code>·function·in·the·script·returns·successfully,·the·exit·status·for188 arguments·specified·to·the·script·(not·changed·or·interpreted·in·any·way).</p><p>If·the·<code·class="inline">main/1</code>·function·in·the·script·returns·successfully,·the·exit·status·for
189 the·script·is·<code·class="inline">0</code>.·If·an·exception·is·generated·during·execution,·a·short189 the·script·is·<code·class="inline">0</code>.·If·an·exception·is·generated·during·execution,·a·short
190 message·is·printed·and·the·script·terminates·with·exit·status·<code·class="inline">127</code>.</p><p>To·return·your·own·non-zero·exit·code,·call·<a·href="erlang.html#halt/1"><code·class="inline">halt(ExitCode)</code></a>,·for190 message·is·printed·and·the·script·terminates·with·exit·status·<code·class="inline">127</code>.</p><p>To·return·your·own·non-zero·exit·code,·call·<a·href="erlang.html#halt/1"><code·class="inline">halt(ExitCode)</code></a>,·for
191 example:</p><pre><code·class="text">halt(1).</code></pre><p>To·retrieve·the·pathname·of·the·script,·call·<a·href="../../../lib/stdlib-6.2.2/doc/html/escript.html#script_name/0"><code·class="inline">escript:script_name/0</code></a>·from·your191 example:</p><pre><code·class="text">halt(1).</code></pre><p>To·retrieve·the·pathname·of·the·script,·call·<a·href="../../../lib/stdlib-6.2.2/doc/html/escript.html#script_name/0"><code·class="inline">escript:script_name/0</code></a>·from·your
192 script·(the·pathname·is·usually,·but·not·always,·absolute).</p><p>If·the·file·contains·source·code·(as·in·the·example·above),·it·is·processed·by192 script·(the·pathname·is·usually,·but·not·always,·absolute).</p><p>If·the·file·contains·source·code·(as·in·the·example·above),·it·is·processed·by
193 the·<a·href="../../../lib/stdlib-6.2.2/doc/html/epp.html"><code·class="inline">epp</code></a>·preprocessor.·This·means·that·you,·for·example,·can·use·predefined193 the·<a·href="../../../lib/stdlib-6.2.2/doc/html/epp.html"><code·class="inline">epp</code></a>·preprocessor.·This·means·that·you,·for·example,·can·use·predefined
194 macros·(such·as·<code·class="inline">?MODULE</code>)·and·include·directives·like·the·<code·class="inline">-include_lib</code>194 macros·(such·as·<code·class="inline">?MODULE</code>)·and·include·directives·like·the·<code·class="inline">-include_lib</code>
195 directive.·For·example,·use</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3439461994-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="3439461994-1">)</span><span·class="p">.</span></code></pre><p>to·include·the·record·definitions·for·the·records·used·by·function195 directive.·For·example,·use</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3034613610-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="3034613610-1">)</span><span·class="p">.</span></code></pre><p>to·include·the·record·definitions·for·the·records·used·by·function
196 <a·href="../../../lib/kernel-10.2.6/doc/html/file.html#read_link_info/1"><code·class="inline">file:read_link_info/1</code></a>.·You·can·also·select·encoding·by·including·an·encoding196 <a·href="../../../lib/kernel-10.2.6/doc/html/file.html#read_link_info/1"><code·class="inline">file:read_link_info/1</code></a>.·You·can·also·select·encoding·by·including·an·encoding
197 comment·here,·but·if·a·valid·encoding·comment·exists·on·the·second·line,·it197 comment·here,·but·if·a·valid·encoding·comment·exists·on·the·second·line,·it
198 takes·precedence.</p><p>The·script·is·checked·for·syntactic·and·semantic·correctness·before·it·is·run.198 takes·precedence.</p><p>The·script·is·checked·for·syntactic·and·semantic·correctness·before·it·is·run.
199 If·there·are·warnings·(such·as·unused·variables),·they·are·printed·and·the199 If·there·are·warnings·(such·as·unused·variables),·they·are·printed·and·the
200 script·will·still·be·run.·If·there·are·errors,·they·are·printed·and·the·script200 script·will·still·be·run.·If·there·are·errors,·they·are·printed·and·the·script
201 will·not·be·run·and·its·exit·status·is·<code·class="inline">127</code>.</p><p>Both·the·module·declaration·and·the·export·declaration·of·the·<code·class="inline">main/1</code>·function201 will·not·be·run·and·its·exit·status·is·<code·class="inline">127</code>.</p><p>Both·the·module·declaration·and·the·export·declaration·of·the·<code·class="inline">main/1</code>·function
202 are·optional.</p><p>By·default,·the·script·will·be·compiled·by·the·Erlang·compiler.</p><p>It·is·possible·to·force·it·to·be·interpreted·by·including·the·following·line202 are·optional.</p><p>By·default,·the·script·will·be·compiled·by·the·Erlang·compiler.</p><p>It·is·possible·to·force·it·to·be·interpreted·by·including·the·following·line
203 somewhere·in·the·script·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">mode</span><span·class="p"·data-group-id="6544411485-1">(</span><span·class="ss">interpret</span><span·class="p"·data-group-id="6544411485-1">)</span><span·class="p">.</span></code></pre><p>Execution·of·interpreted·code·is·slower·than·compiled·code,·and·some·language203 somewhere·in·the·script·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">mode</span><span·class="p"·data-group-id="9538737324-1">(</span><span·class="ss">interpret</span><span·class="p"·data-group-id="9538737324-1">)</span><span·class="p">.</span></code></pre><p>Execution·of·interpreted·code·is·slower·than·compiled·code,·and·some·language
204 constructs·will·not·work,·but·there·is·no·requirement·for·the·Erlang·compiler204 constructs·will·not·work,·but·there·is·no·requirement·for·the·Erlang·compiler
205 application·to·be·available.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·27·the·script·would·be·interpreted·by·default.</p></section><h2·id="precompiled-escripts"·class="section-heading">205 application·to·be·available.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>Before·Erlang/OTP·27·the·script·would·be·interpreted·by·default.</p></section><h2·id="precompiled-escripts"·class="section-heading">
206 ··<a·href="#precompiled-escripts"·class="hover-link">206 ··<a·href="#precompiled-escripts"·class="hover-link">
207 ····<i·class="ri-link-m"·aria-hidden="true"></i>207 ····<i·class="ri-link-m"·aria-hidden="true"></i>
208 ··</a>208 ··</a>
209 ··<span·class="text">Precompiled·escripts</span>209 ··<span·class="text">Precompiled·escripts</span>
210 </h2>210 </h2>
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309 ······<p·class="built-using">309 ······<p·class="built-using">
310 ········Built·using310 ········Built·using
311 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the311 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
312 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>312 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
313 ······</p>313 ······</p>
314 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>314 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
315 ····</footer>315 ····</footer>
316 ··</div>316 ··</div>
317 </main>317 </main>
318 </div>318 </div>
319 <script>319 <script>
320 ··function·mermaidLoaded()·{320 ··function·mermaidLoaded()·{
321 ····mermaid.initialize({321 ····mermaid.initialize({
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133 </h2>133 </h2>
134 <p>Each·Erlang·process·has·its·own·stack·and·heap·which·are·allocated·in·the·same·memory·block·and·grow·towards·each·other.·When·the·stack·and·the·heap·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/beam_emu.c#L387">meet</a>,·the·garbage·collector·is·triggered·and·memory·is·reclaimed.·If·not·enough·memory·was·reclaimed,·the·heap·will·grow.</p><h3·id="creating-data"·class="section-heading">134 <p>Each·Erlang·process·has·its·own·stack·and·heap·which·are·allocated·in·the·same·memory·block·and·grow·towards·each·other.·When·the·stack·and·the·heap·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/beam_emu.c#L387">meet</a>,·the·garbage·collector·is·triggered·and·memory·is·reclaimed.·If·not·enough·memory·was·reclaimed,·the·heap·will·grow.</p><h3·id="creating-data"·class="section-heading">
135 ··<a·href="#creating-data"·class="hover-link">135 ··<a·href="#creating-data"·class="hover-link">
136 ····<i·class="ri-link-m"·aria-hidden="true"></i>136 ····<i·class="ri-link-m"·aria-hidden="true"></i>
137 ··</a>137 ··</a>
138 ··<span·class="text">Creating·Data</span>138 ··<span·class="text">Creating·Data</span>
139 </h3>139 </h3>
140 <p>Terms·are·created·on·the·heap·by·evaluating·expressions.·There·are·two·major·types·of·terms:·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_term.h#L88-L97">immediate·terms</a>·which·require·no·heap·space·(small·integers,·atoms,·pids,·port·ids·etc)·and·cons·or·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_term.h#L106-L120">boxed·terms</a>·(tuple,·big·num,·binaries·etc)·that·do·require·heap·space.·Immediate·terms·do·not·need·any·heap·space·because·they·are·embedded·into·the·containing·structure.</p><p>Let's·look·at·an·example·that·returns·a·tuple·with·the·newly·created·data.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">data</span><span·class="p"·data-group-id="2941145864-1">(</span><span·class="n">Foo</span><span·class="p"·data-group-id="2941145864-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">140 <p>Terms·are·created·on·the·heap·by·evaluating·expressions.·There·are·two·major·types·of·terms:·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_term.h#L88-L97">immediate·terms</a>·which·require·no·heap·space·(small·integers,·atoms,·pids,·port·ids·etc)·and·cons·or·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_term.h#L106-L120">boxed·terms</a>·(tuple,·big·num,·binaries·etc)·that·do·require·heap·space.·Immediate·terms·do·not·need·any·heap·space·because·they·are·embedded·into·the·containing·structure.</p><p>Let's·look·at·an·example·that·returns·a·tuple·with·the·newly·created·data.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">data</span><span·class="p"·data-group-id="0463566806-1">(</span><span·class="n">Foo</span><span·class="p"·data-group-id="0463566806-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
141 ···</span><span·class="n">Cons</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2941145864-2">[</span><span·class="mi">42</span><span·class="p">|</span><span·class="n">Foo</span><span·class="p"·data-group-id="2941145864-2">]</span><span·class="p">,</span><span·class="w">141 ···</span><span·class="n">Cons</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0463566806-2">[</span><span·class="mi">42</span><span·class="p">|</span><span·class="n">Foo</span><span·class="p"·data-group-id="0463566806-2">]</span><span·class="p">,</span><span·class="w">
142 ···</span><span·class="n">Literal</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2941145864-3">{</span><span·class="ss">text</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;hello·world!&quot;</span><span·class="p"·data-group-id="2941145864-3">}</span><span·class="p">,</span><span·class="w">142 ···</span><span·class="n">Literal</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0463566806-3">{</span><span·class="ss">text</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;hello·world!&quot;</span><span·class="p"·data-group-id="0463566806-3">}</span><span·class="p">,</span><span·class="w">
143 ···</span><span·class="p"·data-group-id="2941145864-4">{</span><span·class="ss">tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cons</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Literal</span><span·class="p"·data-group-id="2941145864-4">}</span><span·class="p">.</span></code></pre><p>In·this·example·we·first·create·a·new·cons·cell·with·an·integer·and·a·tuple·with·some·text.·Then·a·tuple·of·size·three·wrapping·the·other·values·with·an·atom·tag·is·created·and·returned.</p><p>On·the·heap·tuples·require·a·word·size·for·each·of·its·elements·as·well·as·for·the·header.·Cons·cells·always·require·two·words.·Adding·these·things·together,·we·get·seven·words·for·the·tuples·and·26·words·for·the·cons·cells.·The·string·<code·class="inline">&quot;hello·world!&quot;</code>·is·a·list·of·cons·cells·and·thus·requires·24·words.·The·atom·<code·class="inline">tag</code>·and·the·integer·<code·class="inline">42</code>·do·not·require·any·additional·heap·memory·since·it·is·an·<em>immediate</em>.·Adding·all·the·terms·together,·the·heap·space·required·in·this·example·should·be·33·words.</p><p>Compiling·this·code·to·beam·assembly·(<code·class="inline">erlc·-S</code>)·shows·exactly·what·is·happening.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">143 ···</span><span·class="p"·data-group-id="0463566806-4">{</span><span·class="ss">tag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cons</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Literal</span><span·class="p"·data-group-id="0463566806-4">}</span><span·class="p">.</span></code></pre><p>In·this·example·we·first·create·a·new·cons·cell·with·an·integer·and·a·tuple·with·some·text.·Then·a·tuple·of·size·three·wrapping·the·other·values·with·an·atom·tag·is·created·and·returned.</p><p>On·the·heap·tuples·require·a·word·size·for·each·of·its·elements·as·well·as·for·the·header.·Cons·cells·always·require·two·words.·Adding·these·things·together,·we·get·seven·words·for·the·tuples·and·26·words·for·the·cons·cells.·The·string·<code·class="inline">&quot;hello·world!&quot;</code>·is·a·list·of·cons·cells·and·thus·requires·24·words.·The·atom·<code·class="inline">tag</code>·and·the·integer·<code·class="inline">42</code>·do·not·require·any·additional·heap·memory·since·it·is·an·<em>immediate</em>.·Adding·all·the·terms·together,·the·heap·space·required·in·this·example·should·be·33·words.</p><p>Compiling·this·code·to·beam·assembly·(<code·class="inline">erlc·-S</code>)·shows·exactly·what·is·happening.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
144 </span><span·class="p"·data-group-id="5330163388-1">{</span><span·class="ss">test_heap</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5330163388-1">}</span><span·class="p">.</span><span·class="w">144 </span><span·class="p"·data-group-id="5375175436-1">{</span><span·class="ss">test_heap</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5375175436-1">}</span><span·class="p">.</span><span·class="w">
145 </span><span·class="p"·data-group-id="5330163388-2">{</span><span·class="ss">put_list</span><span·class="p">,</span><span·class="p"·data-group-id="5330163388-3">{</span><span·class="ss">integer</span><span·class="p">,</span><span·class="mi">42</span><span·class="p"·data-group-id="5330163388-3">}[·...·truncated·by·diffoscope;·len:·456,·SHA:·ba0c6a19dc843a9bbf412b40b3f74deffb5237dd778131bb0cf4e81541d111ba·...·]-2">}</span><span·class="p">.</span><span·class="w">145 </span><span·class="p"·data-group-id="5375175436-2">{</span><span·class="ss">put_list</span><span·class="p">,</span><span·class="p"·data-group-id="5375175436-3">{</span><span·class="ss">integer</span><span·class="p">,</span><span·class="mi">42</span><span·class="p"·data-group-id="5375175436-3">}[·...·truncated·by·diffoscope;·len:·456,·SHA:·719a48a71810fbac366498b2f830baffc66277f298d7fe47de6c14abcda61720·...·]-2">}</span><span·class="p">.</span><span·class="w">
146 </span><span·class="p"·data-group-id="5330163388-6">{</span><span·class="ss">put_tuple</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-group-id="5330163388-7">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="mi">0</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·45948bc6ca61ae9f49f0452701e6404948f8947d188a381d4050144360740691·...·]-6">}</span><span·class="p">.</span><span·class="w">146 </span><span·class="p"·data-group-id="5375175436-6">{</span><span·class="ss">put_tuple</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-group-id="5375175436-7">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="mi">0</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·276931aed9a33a21a6bee7cd051c5d3636b519fc5f39b1effd80b25c0eb0662b·...·]-6">}</span><span·class="p">.</span><span·class="w">
147 </span><span·class="p"·data-group-id="5330163388-8">{</span><span·class="nb">put</span><span·class="p">,</span><span·class="p"·data-group-id="5330163388-9">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="ss">tag</span><span·class="p"·data-group-id="5330163388-9">}</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·4d802808a42e8695ed9745f1fb1c8119b98c126ff2bbb84b87930fac24e492a6·...·]-8">}</span><span·class="p">.</span><span·class="w">147 </span><span·class="p"·data-group-id="5375175436-8">{</span><span·class="nb">put</span><span·class="p">,</span><span·class="p"·data-group-id="5375175436-9">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="ss">tag</span><span·class="p"·data-group-id="5375175436-9">}</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·2fb2fc07fbfda6d117d1d84853b9f5f8b5151505b54f76e863b4c9a1562af72f·...·]-8">}</span><span·class="p">.</span><span·class="w">
148 </span><span·class="p"·data-group-id="5330163388-10">{</span><span·class="nb">put</span><span·class="p">,</span><span·class="p"·data-group-id="5330163388-11">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5330163388-11">}</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·b560c4315e0e723285a3613bb3fc2b2781888aa169267a52aa23a850eb6cbcae·...·]-10">}</span><span·class="p">.</span><span·class="w">148 </span><span·class="p"·data-group-id="5375175436-10">{</span><span·class="nb">put</span><span·class="p">,</span><span·class="p"·data-group-id="5375175436-11">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5375175436-11">}</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·71679bf99c88fe480739c0488e4a0ed76e759619b01e43a6687921232c575a4e·...·]-10">}</span><span·class="p">.</span><span·class="w">
149 </span><span·class="p"·data-group-id="5330163388-12">{</span><span·class="nb">put</span><span·class="p">,</span><span·class="p"·data-group-id="5330163388-13">{</span><span·class="ss">literal</span><span·class="p">,</span><span·class="p"·data-group-id="5330163388-14">{</span><span·class="ss">text[·...·truncated·by·diffoscope;·len:·227,·SHA:·56b3d52688e4781896ea79060f3c7acfbb4cab3d90843e3390aa59ca446e0aac·...·]-12">}</span><span·class="p">.</span><span·class="w">149 </span><span·class="p"·data-group-id="5375175436-12">{</span><span·class="nb">put</span><span·class="p">,</span><span·class="p"·data-group-id="5375175436-13">{</span><span·class="ss">literal</span><span·class="p">,</span><span·class="p"·data-group-id="5375175436-14">{</span><span·class="ss">text[·...·truncated·by·diffoscope;·len:·227,·SHA:·52d60ac606f7194ed8ee60ebd123c818d85b5b20f691dd612ae370183ca099a6·...·]-12">}</span><span·class="p">.</span><span·class="w">
150 </span><span·class="ss">return</span><span·class="p">.</span></code></pre><p>Looking·at·the·assembler·code·we·can·see·three·things:·The·heap·requirement·in·this·function·turns·out·to·be·only·six·words,·as·seen·by·the·<code·class="inline">{test_heap,6,1}</code>·instruction.·All·the·allocations·are·combined·to·a·single·instruction.·The·bulk·of·the·data·<code·class="inline">{text,·&quot;hello·world!&quot;}</code>·is·a·<em>literal</em>.·Literals,·sometimes·referred·to·as·constants,·are·not·allocated·in·the·function·since·they·are·a·part·of·the·module·and·allocated·at·load·time.</p><p>If·there·is·not·enough·space·available·on·the·heap·to·satisfy·the·<code·class="inline">test_heap</code>·instructions·request·for·memory,·then·a·garbage·collection·is·initiated.·It·may·happen·immediately·in·the·<code·class="inline">test_heap</code>·instruction,·or·it·can·be·delayed·until·a·later·time·depending·on·what·state·the·process·is·in.·If·the·garbage·collection·is·delayed,·any·memory·needed·will·be·allocated·in·heap·fragments.·Heap·fragments·are·extra·memory·blocks·that·are·a·part·of·the·young·heap,·but·are·not·allocated·in·the·contiguous·area·where·terms·normally·reside.·See·<a·href="#the-young-heap">The·young·heap</a>·for·more·details.</p><h3·id="the-collector"·class="section-heading">150 </span><span·class="ss">return</span><span·class="p">.</span></code></pre><p>Looking·at·the·assembler·code·we·can·see·three·things:·The·heap·requirement·in·this·function·turns·out·to·be·only·six·words,·as·seen·by·the·<code·class="inline">{test_heap,6,1}</code>·instruction.·All·the·allocations·are·combined·to·a·single·instruction.·The·bulk·of·the·data·<code·class="inline">{text,·&quot;hello·world!&quot;}</code>·is·a·<em>literal</em>.·Literals,·sometimes·referred·to·as·constants,·are·not·allocated·in·the·function·since·they·are·a·part·of·the·module·and·allocated·at·load·time.</p><p>If·there·is·not·enough·space·available·on·the·heap·to·satisfy·the·<code·class="inline">test_heap</code>·instructions·request·for·memory,·then·a·garbage·collection·is·initiated.·It·may·happen·immediately·in·the·<code·class="inline">test_heap</code>·instruction,·or·it·can·be·delayed·until·a·later·time·depending·on·what·state·the·process·is·in.·If·the·garbage·collection·is·delayed,·any·memory·needed·will·be·allocated·in·heap·fragments.·Heap·fragments·are·extra·memory·blocks·that·are·a·part·of·the·young·heap,·but·are·not·allocated·in·the·contiguous·area·where·terms·normally·reside.·See·<a·href="#the-young-heap">The·young·heap</a>·for·more·details.</p><h3·id="the-collector"·class="section-heading">
151 ··<a·href="#the-collector"·class="hover-link">151 ··<a·href="#the-collector"·class="hover-link">
152 ····<i·class="ri-link-m"·aria-hidden="true"></i>152 ····<i·class="ri-link-m"·aria-hidden="true"></i>
153 ··</a>153 ··</a>
154 ··<span·class="text">The·collector</span>154 ··<span·class="text">The·collector</span>
155 </h3>155 </h3>
156 <p>Erlang·has·a·copying·semi-space·garbage·collector.·This·means·that·when·doing·a·garbage·collection,·the·terms·are·copied·from·one·distinct·area,·called·the·<em>from·space</em>,·to·a·new·clean·area,·called·the·<em>to·space</em>.·The·collector·starts·by·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1980">scanning·the·root-set</a>·(stack,·registers,·etc).</p><p><img·src="assets/gc-start.png"·alt="Garbage·collection:·initial·values"/></p><p>It·follows·all·the·pointers·from·the·root-set·to·the·heap·and·copies·each·term·word·by·word·to·the·<em>to·space</em>.</p><p>After·the·header·word·has·been·copied·a·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.h#L45-L46"><em>move·marker</em></a>·is·destructively·placed·in·it·pointing·to·the·term·in·the·<em>to·space</em>.·Any·other·term·that·points·to·the·already·moved·term·will·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1125">see·this·move·marker</a>·and·copy·the·referring·pointer·instead.·For·example,·if·the·have·the·following·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="5491062410-1">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="5491062410-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 <p>Erlang·has·a·copying·semi-space·garbage·collector.·This·means·that·when·doing·a·garbage·collection,·the·terms·are·copied·from·one·distinct·area,·called·the·<em>from·space</em>,·to·a·new·clean·area,·called·the·<em>to·space</em>.·The·collector·starts·by·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1980">scanning·the·root-set</a>·(stack,·registers,·etc).</p><p><img·src="assets/gc-start.png"·alt="Garbage·collection:·initial·values"/></p><p>It·follows·all·the·pointers·from·the·root-set·to·the·heap·and·copies·each·term·word·by·word·to·the·<em>to·space</em>.</p><p>After·the·header·word·has·been·copied·a·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.h#L45-L46"><em>move·marker</em></a>·is·destructively·placed·in·it·pointing·to·the·term·in·the·<em>to·space</em>.·Any·other·term·that·points·to·the·already·moved·term·will·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1125">see·this·move·marker</a>·and·copy·the·referring·pointer·instead.·For·example,·if·the·have·the·following·Erlang·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="6007162038-1">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="6007162038-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ····</span><span·class="n">T</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5491062410-2">{</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arg</span><span·class="p"·data-group-id="5491062410-2">}</span><span·class="p">,</span><span·class="w">157 ····</span><span·class="n">T</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6007162038-2">{</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arg</span><span·class="p"·data-group-id="6007162038-2">}</span><span·class="p">,</span><span·class="w">
158 ····</span><span·class="p"·data-group-id="5491062410-3">{</span><span·class="ss">wrapper</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·54,·SHA:·e8dfd3e59135d6091defcd5baaefaee229d1c3d9bbcba63d7a4089ba534f9acf·...·]-3">}</span><span·class="p">.</span></code></pre><p>Only·one·copy·of·T·exists·on·the·heap·and·during·the·garbage·collection·only·the·first·time·T·is·encountered·will·it·be·copied.</p><p><img·src="assets/gc-rootset-scan.png"·alt="Garbage·collection:·root·set·scan"/></p><p>After·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1089">all·terms</a>·referenced·by·the·root-set·have·been·copied,·the·collector·scans·the·<em>to·space</em>·and·copies·all·terms·that·these·terms·reference.·When·scanning,·the·collector·steps·through·each·term·on·the·<em>to·space</em>·and·any·term·still·referencing·the·<em>from·space</em>·is·copied·over·to·the·<em>to·space</em>.·Some·terms·contain·non-term·data·(the·payload·of·a·on·heap·binary·for·instance).·When·encountered·by·the·collector,·these·values·are·simply·skipped.</p><p><img·src="assets/gc-heap-scan1.png"·alt="Garbage·collection:·heap·scan"/></p><p>Every·term·object·we·can·reach·is·copied·to·the·<em>to·space</em>·and·stored·on·top·off·the·<em>scan·stop</em>·line,·and·then·the·scan·stop·is·moved·to·the·end·of·the·last·object.</p><p><img·src="assets/gc-heap-stop.png"·alt="Garbage·collection:·heap·scan"/></p><p>When·<em>scan·stop</em>·marker·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1103">catches·up</a>·to·the·<em>scan·start</em>·marker,·the·garbage·collection·is·done.·At·this·point·we·can·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1206">deallocate</a>·the·entire·<em>from·space</em>·and·therefore·reclaim·the·entire·young·heap.</p><h2·id="generational-garbage-collection"·class="section-heading">158 ····</span><span·class="p"·data-group-id="6007162038-3">{</span><span·class="ss">wrapper</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·54,·SHA:·e95d8053091965b0599c13a811d8d902c655d3b0a84f4b54c42f0f7d599495c0·...·]-3">}</span><span·class="p">.</span></code></pre><p>Only·one·copy·of·T·exists·on·the·heap·and·during·the·garbage·collection·only·the·first·time·T·is·encountered·will·it·be·copied.</p><p><img·src="assets/gc-rootset-scan.png"·alt="Garbage·collection:·root·set·scan"/></p><p>After·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1089">all·terms</a>·referenced·by·the·root-set·have·been·copied,·the·collector·scans·the·<em>to·space</em>·and·copies·all·terms·that·these·terms·reference.·When·scanning,·the·collector·steps·through·each·term·on·the·<em>to·space</em>·and·any·term·still·referencing·the·<em>from·space</em>·is·copied·over·to·the·<em>to·space</em>.·Some·terms·contain·non-term·data·(the·payload·of·a·on·heap·binary·for·instance).·When·encountered·by·the·collector,·these·values·are·simply·skipped.</p><p><img·src="assets/gc-heap-scan1.png"·alt="Garbage·collection:·heap·scan"/></p><p>Every·term·object·we·can·reach·is·copied·to·the·<em>to·space</em>·and·stored·on·top·off·the·<em>scan·stop</em>·line,·and·then·the·scan·stop·is·moved·to·the·end·of·the·last·object.</p><p><img·src="assets/gc-heap-stop.png"·alt="Garbage·collection:·heap·scan"/></p><p>When·<em>scan·stop</em>·marker·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1103">catches·up</a>·to·the·<em>scan·start</em>·marker,·the·garbage·collection·is·done.·At·this·point·we·can·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1206">deallocate</a>·the·entire·<em>from·space</em>·and·therefore·reclaim·the·entire·young·heap.</p><h2·id="generational-garbage-collection"·class="section-heading">
159 ··<a·href="#generational-garbage-collection"·class="hover-link">159 ··<a·href="#generational-garbage-collection"·class="hover-link">
160 ····<i·class="ri-link-m"·aria-hidden="true"></i>160 ····<i·class="ri-link-m"·aria-hidden="true"></i>
161 ··</a>161 ··</a>
162 ··<span·class="text">Generational·Garbage·Collection</span>162 ··<span·class="text">Generational·Garbage·Collection</span>
163 </h2>163 </h2>
164 <p>In·addition·to·the·collection·algorithm·described·above,·the·Erlang·garbage·collector·also·provides·generational·garbage·collection.·An·additional·heap,·called·the·old·heap,·is·used·where·the·long·lived·data·is·stored.·The·original·heap·is·called·the·young·heap,·or·sometimes·the·allocation·heap.</p><p>With·this·in·mind·we·can·look·at·the·Erlang's·garbage·collection·again.·During·the·copy·stage·anything·that·should·be·copied·to·the·young·<em>to·space</em>·is·instead·copied·to·the·old·<em>to·space</em>·<em>if</em>·it·is·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1127">below·the·<em>high-watermark</em></a>.</p><p><img·src="assets/gc-watermark.png"·alt="Garbage·collection:·heap·scan"/></p><p>The·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_process.h#L1021"><em>high-watermark</em></a>·is·placed·where·the·previous·garbage·collection·(described·in·<a·href="#overview">Overview</a>)·ended·and·we·have·introduced·a·new·area·called·the·old·heap.·When·doing·the·normal·garbage·collection·pass,·any·term·that·is·located·below·the·high-watermark·is·copied·to·the·old·<em>to·space</em>·instead·of·the·young.</p><p><img·src="assets/gc-watermark-2.png"·alt="Garbage·collection:·heap·scan"/></p><p>In·the·next·garbage·collection,·any·pointers·to·the·old·heap·will·be·ignored·and·not·scanned.·This·way·the·garbage·collector·does·not·have·to·scan·the·long-lived·terms.</p><p>Generational·garbage·collection·aims·to·increase·performance·at·the·expense·of·memory.·This·is·achieved·because·only·the·young,·smaller,·heap·is·considered·in·most·garbage·collections.</p><p>The·generational·hypothesis·predicts·that·most·terms·tend·to·die·young·(see·D.·Ungar·in·<a·href="#references">References</a>),·and·for·an·immutable·language·such·as·Erlang,·young·terms·die·even·faster·than·in·other·languages.·So·for·most·usage·patterns·the·data·in·the·new·heap·will·die·very·soon·after·it·is·allocated.·This·is·good·because·it·limits·the·amount·of·data·copied·to·the·old·heap·and·also·because·the·garbage·collection·algorithm·used·is·proportional·to·the·amount·of·live·data·on·the·heap.</p><p>One·critical·issue·to·note·here·is·that·any·term·on·the·young·heap·can·reference·terms·on·the·old·heap·but·<em>no</em>·term·on·the·old·heap·may·refer·to·a·term·on·the·young·heap.·This·is·due·to·the·nature·of·the·copy·algorithm.·Anything·referenced·by·an·old·heap·term·is·not·included·in·the·reference·tree,·root-set·and·its·followers,·and·hence·is·not·copied.·If·it·was,·the·data·would·be·lost,·fire·and·brimstone·would·rise·to·cover·the·earth.·Fortunately,·this·comes·naturally·for·Erlang·because·the·terms·are·immutable·and·thus·there·can·be·no·pointers·modified·on·the·old·heap·to·point·to·the·young·heap.</p><p>To·reclaim·data·from·the·old·heap,·both·young·and·old·heaps·are·included·during·the·collection·and·copied·to·a·common·<em>to·space</em>.·Both·the·<em>from·space</em>·of·the·young·and·old·heap·are·then·deallocated·and·the·procedure·will·start·over·from·the·beginning.·This·type·of·garbage·collection·is·called·a·full·sweep·and·is·triggered·when·the·size·of·the·area·under·the·high-watermark·is·larger·than·the·size·of·the·free·area·of·the·old·heap.·It·can·also·be·triggered·by·doing·a·manual·call·to·<a·href="http://erlang.org/doc/man/erlang.html#garbage_collect-0">erlang:garbage_collect()</a>,·or·by·running·into·the·young·garbage·collection·limit·set·by·[spawn_opt(fun(),<a·href="http://erlang.org/doc/man/erlang.html#spawn_opt-4">{fullsweep_after,·N}])</a>·where·N·is·the·number·of·young·garbage·collections·to·do·before·forcing·a·garbage·collection·of·both·young·and·old·heap.</p><h2·id="the-young-heap"·class="section-heading">164 <p>In·addition·to·the·collection·algorithm·described·above,·the·Erlang·garbage·collector·also·provides·generational·garbage·collection.·An·additional·heap,·called·the·old·heap,·is·used·where·the·long·lived·data·is·stored.·The·original·heap·is·called·the·young·heap,·or·sometimes·the·allocation·heap.</p><p>With·this·in·mind·we·can·look·at·the·Erlang's·garbage·collection·again.·During·the·copy·stage·anything·that·should·be·copied·to·the·young·<em>to·space</em>·is·instead·copied·to·the·old·<em>to·space</em>·<em>if</em>·it·is·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L1127">below·the·<em>high-watermark</em></a>.</p><p><img·src="assets/gc-watermark.png"·alt="Garbage·collection:·heap·scan"/></p><p>The·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_process.h#L1021"><em>high-watermark</em></a>·is·placed·where·the·previous·garbage·collection·(described·in·<a·href="#overview">Overview</a>)·ended·and·we·have·introduced·a·new·area·called·the·old·heap.·When·doing·the·normal·garbage·collection·pass,·any·term·that·is·located·below·the·high-watermark·is·copied·to·the·old·<em>to·space</em>·instead·of·the·young.</p><p><img·src="assets/gc-watermark-2.png"·alt="Garbage·collection:·heap·scan"/></p><p>In·the·next·garbage·collection,·any·pointers·to·the·old·heap·will·be·ignored·and·not·scanned.·This·way·the·garbage·collector·does·not·have·to·scan·the·long-lived·terms.</p><p>Generational·garbage·collection·aims·to·increase·performance·at·the·expense·of·memory.·This·is·achieved·because·only·the·young,·smaller,·heap·is·considered·in·most·garbage·collections.</p><p>The·generational·hypothesis·predicts·that·most·terms·tend·to·die·young·(see·D.·Ungar·in·<a·href="#references">References</a>),·and·for·an·immutable·language·such·as·Erlang,·young·terms·die·even·faster·than·in·other·languages.·So·for·most·usage·patterns·the·data·in·the·new·heap·will·die·very·soon·after·it·is·allocated.·This·is·good·because·it·limits·the·amount·of·data·copied·to·the·old·heap·and·also·because·the·garbage·collection·algorithm·used·is·proportional·to·the·amount·of·live·data·on·the·heap.</p><p>One·critical·issue·to·note·here·is·that·any·term·on·the·young·heap·can·reference·terms·on·the·old·heap·but·<em>no</em>·term·on·the·old·heap·may·refer·to·a·term·on·the·young·heap.·This·is·due·to·the·nature·of·the·copy·algorithm.·Anything·referenced·by·an·old·heap·term·is·not·included·in·the·reference·tree,·root-set·and·its·followers,·and·hence·is·not·copied.·If·it·was,·the·data·would·be·lost,·fire·and·brimstone·would·rise·to·cover·the·earth.·Fortunately,·this·comes·naturally·for·Erlang·because·the·terms·are·immutable·and·thus·there·can·be·no·pointers·modified·on·the·old·heap·to·point·to·the·young·heap.</p><p>To·reclaim·data·from·the·old·heap,·both·young·and·old·heaps·are·included·during·the·collection·and·copied·to·a·common·<em>to·space</em>.·Both·the·<em>from·space</em>·of·the·young·and·old·heap·are·then·deallocated·and·the·procedure·will·start·over·from·the·beginning.·This·type·of·garbage·collection·is·called·a·full·sweep·and·is·triggered·when·the·size·of·the·area·under·the·high-watermark·is·larger·than·the·size·of·the·free·area·of·the·old·heap.·It·can·also·be·triggered·by·doing·a·manual·call·to·<a·href="http://erlang.org/doc/man/erlang.html#garbage_collect-0">erlang:garbage_collect()</a>,·or·by·running·into·the·young·garbage·collection·limit·set·by·[spawn_opt(fun(),<a·href="http://erlang.org/doc/man/erlang.html#spawn_opt-4">{fullsweep_after,·N}])</a>·where·N·is·the·number·of·young·garbage·collections·to·do·before·forcing·a·garbage·collection·of·both·young·and·old·heap.</p><h2·id="the-young-heap"·class="section-heading">
165 ··<a·href="#the-young-heap"·class="hover-link">165 ··<a·href="#the-young-heap"·class="hover-link">
Offset 175, 19 lines modifiedOffset 175, 19 lines modified
175 </h2>175 </h2>
176 <p>As·mentioned·in·the·Overview·the·size·of·the·heap·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L247">grows</a>·to·accommodate·more·data.·Heaps·grow·in·two·stages,·first·a·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L199-L208">variation·of·the·Fibonacci·sequence</a>·is·used·starting·at·233·words.·Then·at·about·1·mega·words·the·heap·only·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L215-L227">grows·in·20%·increments</a>.</p><p>There·are·two·occasions·when·the·young·heap·grows:</p><ul><li>if·the·total·size·of·the·heap·+·message·and·heap·fragments·exceeds·the·current·heap·size.</li><li>if·after·a·fullsweep,·the·total·amount·of·live·objects·is·greater·than·75%.</li></ul><p>There·are·two·occasions·when·the·young·heap·is·shrunk:</p><ul><li>if·after·a·young·collection,·the·total·amount·of·live·objects·is·less·than·25%·of·the·heap·and·the·young·heap·is·&quot;big&quot;</li><li>if·after·a·fullsweep,·the·total·amount·of·live·objects·is·less·than·25%·of·the·heap.</li></ul><p>The·old·heap·is·always·one·step·ahead·in·the·heap·growth·stages·than·the·young·heap.</p><h2·id="literals"·class="section-heading">176 <p>As·mentioned·in·the·Overview·the·size·of·the·heap·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L247">grows</a>·to·accommodate·more·data.·Heaps·grow·in·two·stages,·first·a·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L199-L208">variation·of·the·Fibonacci·sequence</a>·is·used·starting·at·233·words.·Then·at·about·1·mega·words·the·heap·only·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L215-L227">grows·in·20%·increments</a>.</p><p>There·are·two·occasions·when·the·young·heap·grows:</p><ul><li>if·the·total·size·of·the·heap·+·message·and·heap·fragments·exceeds·the·current·heap·size.</li><li>if·after·a·fullsweep,·the·total·amount·of·live·objects·is·greater·than·75%.</li></ul><p>There·are·two·occasions·when·the·young·heap·is·shrunk:</p><ul><li>if·after·a·young·collection,·the·total·amount·of·live·objects·is·less·than·25%·of·the·heap·and·the·young·heap·is·&quot;big&quot;</li><li>if·after·a·fullsweep,·the·total·amount·of·live·objects·is·less·than·25%·of·the·heap.</li></ul><p>The·old·heap·is·always·one·step·ahead·in·the·heap·growth·stages·than·the·young·heap.</p><h2·id="literals"·class="section-heading">
177 ··<a·href="#literals"·class="hover-link">177 ··<a·href="#literals"·class="hover-link">
178 ····<i·class="ri-link-m"·aria-hidden="true"></i>178 ····<i·class="ri-link-m"·aria-hidden="true"></i>
179 ··</a>179 ··</a>
180 ··<span·class="text">Literals</span>180 ··<span·class="text">Literals</span>
181 </h2>181 </h2>
182 <p>When·garbage·collecting·a·heap·(young·or·old)·all·literals·are·left·in·place·and·not·copied.·To·figure·out·if·a·term·should·be·copied·or·not·when·doing·a·garbage·collection·the·following·pseudo·code·is·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">if</span><span·class="w">·</span><span·class="p"·data-group-id="0223188464-1">(</span><span·class="nf">erts_is_literal</span><span·class="p"·data-group-id="0223188464-2">(</span><span·class="ss">ptr</span><span·class="p"·data-group-id="0223188464-2">)</span><span·class="w">·</span><span·class="p">||</span><span·class="[·...·truncated·by·diffoscope;·len:·541,·SHA:·9663885420adeabf0b9e193f4e6f9781a2515084a7e74c70208d8788d8c36ff8·...·]-5">{</span><span·class="w">182 <p>When·garbage·collecting·a·heap·(young·or·old)·all·literals·are·left·in·place·and·not·copied.·To·figure·out·if·a·term·should·be·copied·or·not·when·doing·a·garbage·collection·the·following·pseudo·code·is·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">if</span><span·class="w">·</span><span·class="p"·data-group-id="4355222061-1">(</span><span·class="nf">erts_is_literal</span><span·class="p"·data-group-id="4355222061-2">(</span><span·class="ss">ptr</span><span·class="p"·data-group-id="4355222061-2">)</span><span·class="w">·</span><span·class="p">||</span><span·class="[·...·truncated·by·diffoscope;·len:·541,·SHA:·fb8263f1f45e3866bebf8fc410cc1ce3dd61199bce814232d5b8b9545da6ed93·...·]-5">{</span><span·class="w">
183 ··</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">literal</span><span·class="w">·</span><span·class="ow">or</span><span·class="w">·</span><span·class="ss">non</span><span·class="w">·</span><span·class="ss">fullsweep</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">copy</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">183 ··</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">literal</span><span·class="w">·</span><span·class="ow">or</span><span·class="w">·</span><span·class="ss">non</span><span·class="w">·</span><span·class="ss">fullsweep</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">copy</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
184 </span><span·class="p"·data-group-id="0223188464-5">}</span><span·class="w">·</span><span·class="k">else</span><span·class="w">·</span><span·class="p"·data-group-id="0223188464-6">{</span><span·class="w">184 </span><span·class="p"·data-group-id="4355222061-5">}</span><span·class="w">·</span><span·class="k">else</span><span·class="w">·</span><span·class="p"·data-group-id="4355222061-6">{</span><span·class="w">
185 ··</span><span·class="nf">copy</span><span·class="p"·data-group-id="0223188464-7">(</span><span·class="ss">ptr</span><span·class="p"·data-group-id="0223188464-7">)</span><span·class="p">;</span><span·class="w">185 ··</span><span·class="nf">copy</span><span·class="p"·data-group-id="4355222061-7">(</span><span·class="ss">ptr</span><span·class="p"·data-group-id="4355222061-7">)</span><span·class="p">;</span><span·class="w">
186 </span><span·class="p"·data-group-id="0223188464-6">}</span></code></pre><p>The·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/global.h#L1452-L1465"><code·class="inline">erts_is_literal</code></a>·check·works·differently·on·different·architectures·and·operating·systems.</p><p>On·64·bit·systems·that·allow·mapping·of·unreserved·virtual·memory·areas·(most·operating·systems·except·Windows),·an·area·of·size·1·GB·(by·default)·is·mapped·and·then·all·literals·are·placed·within·that·area.·Then·all·that·has·to·be·done·to·determine·if·something·is·a·literal·or·not·is·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_alloc.h#L322-L324">two·quick·pointer·checks</a>.·This·system·relies·on·the·fact·that·a·memory·page·that·has·not·been·touched·yet·does·not·take·any·actual·space.·So·even·if·1·GB·of·virtual·memory·is·mapped,·only·the·memory·which·is·actually·needed·for·literals·is·allocated·in·ram.·The·size·of·the·literal·area·is·configurable·through·the·+MIscs·erts_alloc·option.</p><p>On·32·bit·systems,·there·is·not·enough·virtual·memory·space·to·allocate·1·GB·for·just·literals,·so·instead·small·256·KB·sized·literal·regions·are·created·on·demand·and·a·card·mark·bit-array·of·the·entire·32·bit·memory·space·is·then·used·to·determine·if·a·term·is·a·literal·or·not.·Since·the·total·memory·space·is·only·32·bits,·the·card·mark·bit-array·is·only·256·words·large.·On·a·64·bit·system·the·same·bit-array·would·have·to·be·1·tera·words·large,·so·this·technique·is·only·viable·on·32·bit·systems.·Doing·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_alloc.h#L316-L319">lookups·in·the·array</a>·is·a·little·more·expensive·then·just·doing·the·pointer·checks·that·can·be·done·in·64·bit·systems,·but·not·extremely·so.</p><p>On·64·bit·windows,·on·which·erts_alloc·cannot·do·unreserved·virtual·memory·mappings,·a·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_term.h#L59">special·tag</a>·within·the·Erlang·term·object·is·used·to·determine·if·something·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_term.h#L248-L252">is·a·literal·or·not</a>.·This·is·very·cheap,·however,·the·tag·is·only·available·on·64·bit·machines,·and·it·is·possible·to·do·a·great·deal·of·other·nice·optimizations·with·this·tag·in·the·future·(like·for·instance·a·more·compact·list·implementation)·so·it·is·not·used·on·operating·systems·where·it·is·not·needed.</p><p>This·behaviour·is·different·from·how·it·worked·prior·to·Erlang/OTP·19.0.·Before·19.0·the·literal·check·was·done·by·checking·if·the·pointer·pointed·to·the·young·or·old·heap·block.·If·it·did·not,·then·it·was·considered·a·literal.·This·lead·to·considerable·overhead·and·strange·memory·usage·scenarios,·so·it·was·removed·in·19.0.</p><h2·id="binary-heap"·class="section-heading">186 </span><span·class="p"·data-group-id="4355222061-6">}</span></code></pre><p>The·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/global.h#L1452-L1465"><code·class="inline">erts_is_literal</code></a>·check·works·differently·on·different·architectures·and·operating·systems.</p><p>On·64·bit·systems·that·allow·mapping·of·unreserved·virtual·memory·areas·(most·operating·systems·except·Windows),·an·area·of·size·1·GB·(by·default)·is·mapped·and·then·all·literals·are·placed·within·that·area.·Then·all·that·has·to·be·done·to·determine·if·something·is·a·literal·or·not·is·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_alloc.h#L322-L324">two·quick·pointer·checks</a>.·This·system·relies·on·the·fact·that·a·memory·page·that·has·not·been·touched·yet·does·not·take·any·actual·space.·So·even·if·1·GB·of·virtual·memory·is·mapped,·only·the·memory·which·is·actually·needed·for·literals·is·allocated·in·ram.·The·size·of·the·literal·area·is·configurable·through·the·+MIscs·erts_alloc·option.</p><p>On·32·bit·systems,·there·is·not·enough·virtual·memory·space·to·allocate·1·GB·for·just·literals,·so·instead·small·256·KB·sized·literal·regions·are·created·on·demand·and·a·card·mark·bit-array·of·the·entire·32·bit·memory·space·is·then·used·to·determine·if·a·term·is·a·literal·or·not.·Since·the·total·memory·space·is·only·32·bits,·the·card·mark·bit-array·is·only·256·words·large.·On·a·64·bit·system·the·same·bit-array·would·have·to·be·1·tera·words·large,·so·this·technique·is·only·viable·on·32·bit·systems.·Doing·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_alloc.h#L316-L319">lookups·in·the·array</a>·is·a·little·more·expensive·then·just·doing·the·pointer·checks·that·can·be·done·in·64·bit·systems,·but·not·extremely·so.</p><p>On·64·bit·windows,·on·which·erts_alloc·cannot·do·unreserved·virtual·memory·mappings,·a·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_term.h#L59">special·tag</a>·within·the·Erlang·term·object·is·used·to·determine·if·something·<a·href="https://github.com/erlang/otp/blob/OTP-19.0/erts/emulator/beam/erl_term.h#L248-L252">is·a·literal·or·not</a>.·This·is·very·cheap,·however,·the·tag·is·only·available·on·64·bit·machines,·and·it·is·possible·to·do·a·great·deal·of·other·nice·optimizations·with·this·tag·in·the·future·(like·for·instance·a·more·compact·list·implementation)·so·it·is·not·used·on·operating·systems·where·it·is·not·needed.</p><p>This·behaviour·is·different·from·how·it·worked·prior·to·Erlang/OTP·19.0.·Before·19.0·the·literal·check·was·done·by·checking·if·the·pointer·pointed·to·the·young·or·old·heap·block.·If·it·did·not,·then·it·was·considered·a·literal.·This·lead·to·considerable·overhead·and·strange·memory·usage·scenarios,·so·it·was·removed·in·19.0.</p><h2·id="binary-heap"·class="section-heading">
187 ··<a·href="#binary-heap"·class="hover-link">187 ··<a·href="#binary-heap"·class="hover-link">
188 ····<i·class="ri-link-m"·aria-hidden="true"></i>188 ····<i·class="ri-link-m"·aria-hidden="true"></i>
189 ··</a>189 ··</a>
190 ··<span·class="text">Binary·heap</span>190 ··<span·class="text">Binary·heap</span>
191 </h2>191 </h2>
192 <p>The·binary·heap·works·as·a·large·object·space·for·binary·terms·that·are·greater·than·64·bytes·(from·now·on·called·off-heap·binaries).·The·binary·heap·is·<a·href="https://en.wikipedia.org/wiki/Reference_counting">reference·counted</a>·and·a·pointer·to·the·off-heap·binary·is·stored·on·the·process·heap.·To·keep·track·of·when·to·decrement·the·reference·counter·of·the·off-heap·binary,·a·linked·list·(the·MSO·-·mark·and·sweep·object·list)·containing·funs·and·externals·as·well·as·off-heap·binaries·is·woven·through·the·heap.·After·a·garbage·collection·is·done,·the·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2299">MSO·list·is·swept</a>·and·any·off-heap·binary·that·does·not·have·a·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2325">move·marker</a>·written·into·the·header·words·has·its·reference·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2344-L2367">decremented·and·is·potentially·freed</a>.</p><p>All·items·in·the·MSO·list·are·ordered·by·the·time·they·were·added·to·the·process·heap,·so·when·doing·a·minor·garbage·collection,·the·MSO·sweeper·only·has·to·sweep·until·it·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2369">encounters·an·off-heap·binary·that·is·on·the·old·heap</a>.</p><h3·id="virtual-binary-heap"·class="section-heading">192 <p>The·binary·heap·works·as·a·large·object·space·for·binary·terms·that·are·greater·than·64·bytes·(from·now·on·called·off-heap·binaries).·The·binary·heap·is·<a·href="https://en.wikipedia.org/wiki/Reference_counting">reference·counted</a>·and·a·pointer·to·the·off-heap·binary·is·stored·on·the·process·heap.·To·keep·track·of·when·to·decrement·the·reference·counter·of·the·off-heap·binary,·a·linked·list·(the·MSO·-·mark·and·sweep·object·list)·containing·funs·and·externals·as·well·as·off-heap·binaries·is·woven·through·the·heap.·After·a·garbage·collection·is·done,·the·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2299">MSO·list·is·swept</a>·and·any·off-heap·binary·that·does·not·have·a·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2325">move·marker</a>·written·into·the·header·words·has·its·reference·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2344-L2367">decremented·and·is·potentially·freed</a>.</p><p>All·items·in·the·MSO·list·are·ordered·by·the·time·they·were·added·to·the·process·heap,·so·when·doing·a·minor·garbage·collection,·the·MSO·sweeper·only·has·to·sweep·until·it·<a·href="https://github.com/erlang/otp/blob/OTP-18.0/erts/emulator/beam/erl_gc.c#L2369">encounters·an·off-heap·binary·that·is·on·the·old·heap</a>.</p><h3·id="virtual-binary-heap"·class="section-heading">
193 ··<a·href="#virtual-binary-heap"·class="hover-link">193 ··<a·href="#virtual-binary-heap"·class="hover-link">
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262 ······<p·class="built-using">262 ······<p·class="built-using">
263 ········Built·using263 ········Built·using
264 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the264 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
265 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>265 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
266 ······</p>266 ······</p>
267 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>267 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
268 ····</footer>268 ····</footer>
269 ··</div>269 ··</div>
270 </main>270 </main>
271 </div>271 </div>
272 <script>272 <script>
273 ··function·mermaidLoaded()·{273 ··function·mermaidLoaded()·{
274 ····mermaid.initialize({274 ····mermaid.initialize({
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161 configuration·files·(or·system·registry):</p><ul><li>Hostnames·and·host·addresses</li><li>Domain·name</li><li>Nameservers</li><li>Search·domains</li><li>Lookup·method</li></ul><p>This·data·can·also·be·specified·explicitly·in·the·user·configuration·file.·This161 configuration·files·(or·system·registry):</p><ul><li>Hostnames·and·host·addresses</li><li>Domain·name</li><li>Nameservers</li><li>Search·domains</li><li>Lookup·method</li></ul><p>This·data·can·also·be·specified·explicitly·in·the·user·configuration·file.·This
162 file·is·to·contain·lines·of·configuration·parameters·(each·terminated·with·a162 file·is·to·contain·lines·of·configuration·parameters·(each·terminated·with·a
163 full·stop).·Some·parameters·add·data·to·the·configuration·(such·as·host·and163 full·stop).·Some·parameters·add·data·to·the·configuration·(such·as·host·and
164 nameserver),·others·overwrite·any·previous·settings·(such·as·domain·and·lookup).164 nameserver),·others·overwrite·any·previous·settings·(such·as·domain·and·lookup).
165 The·user·configuration·file·is·always·examined·last·in·the·configuration165 The·user·configuration·file·is·always·examined·last·in·the·configuration
166 process,·making·it·possible·for·the·user·to·override·any·default·values·or166 process,·making·it·possible·for·the·user·to·override·any·default·values·or
167 previously·made·settings.·Call·<code·class="inline">inet:get_rc()</code>·to·view·the·state·of·the·<code·class="inline">inet</code>167 previously·made·settings.·Call·<code·class="inline">inet:get_rc()</code>·to·view·the·state·of·the·<code·class="inline">inet</code>
168 configuration·database.</p><p>The·valid·configuration·parameters·are·as·follows:</p><ul><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3865674424-1">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Format</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="3865674424-1">}</span><span·class="p">.</span><span·class="w">168 configuration·database.</p><p>The·valid·configuration·parameters·are·as·follows:</p><ul><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6363289261-1">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Format</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="6363289261-1">}</span><span·class="p">.</span><span·class="w">
169 ··</span><span·class="n">Format</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="3865674424-2">(</span><span·class="p"·data-group-id="3865674424-2">)</span><span·class="w">169 ··</span><span·class="n">Format</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6363289261-2">(</span><span·class="p"·data-group-id="6363289261-2">)</span><span·class="w">
170 ··</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="3865674424-3">(</span><span·class="p"·data-group-id="3865674424-3">)</span></code></pre><p>Specify·a·system·file·that·Erlang·is·to·read·configuration·data·from.·<code·class="inline">Format</code>170 ··</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="6363289261-3">(</span><span·class="p"·data-group-id="6363289261-3">)</span></code></pre><p>Specify·a·system·file·that·Erlang·is·to·read·configuration·data·from.·<code·class="inline">Format</code>
171 tells·the·parser·how·the·file·is·to·be·interpreted:</p><ul><li><code·class="inline">resolv</code>·(Unix·resolv.conf)</li><li><code·class="inline">host_conf_freebsd</code>·(FreeBSD·host.conf)</li><li><code·class="inline">host_conf_bsdos</code>·(BSDOS·host.conf)</li><li><code·class="inline">host_conf_linux</code>·(Linux·host.conf)</li><li><code·class="inline">nsswitch_conf</code>·(Unix·nsswitch.conf)</li><li><code·class="inline">hosts</code>·(Unix·hosts)</li></ul><p><code·class="inline">File</code>·is·to·specify·the·filename·with·full·path.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1445316229-1">{</span><span·class="ss">resolv_conf</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="1445316229-1">}</span><span·class="p">.</span><span·class="w">171 tells·the·parser·how·the·file·is·to·be·interpreted:</p><ul><li><code·class="inline">resolv</code>·(Unix·resolv.conf)</li><li><code·class="inline">host_conf_freebsd</code>·(FreeBSD·host.conf)</li><li><code·class="inline">host_conf_bsdos</code>·(BSDOS·host.conf)</li><li><code·class="inline">host_conf_linux</code>·(Linux·host.conf)</li><li><code·class="inline">nsswitch_conf</code>·(Unix·nsswitch.conf)</li><li><code·class="inline">hosts</code>·(Unix·hosts)</li></ul><p><code·class="inline">File</code>·is·to·specify·the·filename·with·full·path.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1481615517-1">{</span><span·class="ss">resolv_conf</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="1481615517-1">}</span><span·class="p">.</span><span·class="w">
172 ··</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="1445316229-2">(</span><span·class="p"·data-group-id="1445316229-2">)</span></code></pre><p>Specify·a·system·file·that·Erlang·is·to·read·resolver·configuration·from·for172 ··</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="1481615517-2">(</span><span·class="p"·data-group-id="1481615517-2">)</span></code></pre><p>Specify·a·system·file·that·Erlang·is·to·read·resolver·configuration·from·for
173 the·internal·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>,·and·monitor·for·changes,·even·if·it·does173 the·internal·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>,·and·monitor·for·changes,·even·if·it·does
174 not·exist.·The·path·must·be·absolute.</p><p>This·can·override·the·configuration·parameters·<code·class="inline">nameserver</code>·and·<code·class="inline">search</code>174 not·exist.·The·path·must·be·absolute.</p><p>This·can·override·the·configuration·parameters·<code·class="inline">nameserver</code>·and·<code·class="inline">search</code>
175 depending·on·the·contents·of·the·specified·file.·They·can·also·change·any·time175 depending·on·the·contents·of·the·specified·file.·They·can·also·change·any·time
176 in·the·future·reflecting·the·file·contents.</p><p>If·the·file·is·specified·as·an·empty·string·<code·class="inline">&quot;&quot;</code>,·no·file·is·read·or·monitored176 in·the·future·reflecting·the·file·contents.</p><p>If·the·file·is·specified·as·an·empty·string·<code·class="inline">&quot;&quot;</code>,·no·file·is·read·or·monitored
177 in·the·future.·This·emulates·the·old·behavior·of·not·configuring·the·DNS177 in·the·future.·This·emulates·the·old·behavior·of·not·configuring·the·DNS
178 client·when·the·node·is·started·in·short·name·distributed·mode.</p><p>If·this·parameter·is·not·specified,·it·defaults·to·<code·class="inline">/etc/resolv.conf</code>·unless178 client·when·the·node·is·started·in·short·name·distributed·mode.</p><p>If·this·parameter·is·not·specified,·it·defaults·to·<code·class="inline">/etc/resolv.conf</code>·unless
179 environment·variable·<code·class="inline">ERL_INET_ETC_DIR</code>·is·set,·which·defines·the·directory179 environment·variable·<code·class="inline">ERL_INET_ETC_DIR</code>·is·set,·which·defines·the·directory
180 for·this·file·to·some·maybe·other·than·<code·class="inline">/etc</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7974736420-1">{</span><span·class="ss">hosts_file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="7974736420-1">}</span><span·class="p">.</span><span·class="w">180 for·this·file·to·some·maybe·other·than·<code·class="inline">/etc</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3112385873-1">{</span><span·class="ss">hosts_file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="3112385873-1">}</span><span·class="p">.</span><span·class="w">
181 ··</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="7974736420-2">(</span><span·class="p"·data-group-id="7974736420-2">)</span></code></pre><p>Specify·a·system·file·that·Erlang·is·to·read·resolver·configuration·from·for181 ··</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="3112385873-2">(</span><span·class="p"·data-group-id="3112385873-2">)</span></code></pre><p>Specify·a·system·file·that·Erlang·is·to·read·resolver·configuration·from·for
182 the·internal·hosts·file·resolver,·and·monitor·for·changes,·even·if·it·does·not182 the·internal·hosts·file·resolver,·and·monitor·for·changes,·even·if·it·does·not
183 exist.·The·path·must·be·absolute.</p><p>These·host·entries·are·searched·after·all·added·with·<code·class="inline">{file,·hosts,·File}</code>183 exist.·The·path·must·be·absolute.</p><p>These·host·entries·are·searched·after·all·added·with·<code·class="inline">{file,·hosts,·File}</code>
184 above·or·<code·class="inline">{host,·IP,·Aliases}</code>·below·when·lookup·option·<code·class="inline">file</code>·is·used.</p><p>If·the·file·is·specified·as·an·empty·string·<code·class="inline">&quot;&quot;</code>,·no·file·is·read·or·monitored184 above·or·<code·class="inline">{host,·IP,·Aliases}</code>·below·when·lookup·option·<code·class="inline">file</code>·is·used.</p><p>If·the·file·is·specified·as·an·empty·string·<code·class="inline">&quot;&quot;</code>,·no·file·is·read·or·monitored
185 in·the·future.·This·emulates·the·old·behavior·of·not·configuring·the·DNS185 in·the·future.·This·emulates·the·old·behavior·of·not·configuring·the·DNS
186 client·when·the·node·is·started·in·short·name·distributed·mode.</p><p>If·this·parameter·is·not·specified,·it·defaults·to·<code·class="inline">/etc/hosts</code>·unless186 client·when·the·node·is·started·in·short·name·distributed·mode.</p><p>If·this·parameter·is·not·specified,·it·defaults·to·<code·class="inline">/etc/hosts</code>·unless
187 environment·variable·<code·class="inline">ERL_INET_ETC_DIR</code>·is·set,·which·defines·the·directory187 environment·variable·<code·class="inline">ERL_INET_ETC_DIR</code>·is·set,·which·defines·the·directory
188 for·this·file·to·some·maybe·other·than·<code·class="inline">/etc</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8079336509-1">{</span><span·class="ss">registry</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="8079336509-1">}</span><span·class="p">.</span><span·class="w">188 for·this·file·to·some·maybe·other·than·<code·class="inline">/etc</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7487071428-1">{</span><span·class="ss">registry</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="7487071428-1">}</span><span·class="p">.</span><span·class="w">
189 ··</span><span·class="n">Type</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="8079336509-2">(</span><span·class="p"·data-group-id="8079336509-2">)</span></code></pre><p>Specify·a·system·registry·that·Erlang·is·to·read·configuration·data·from.189 ··</span><span·class="n">Type</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="7487071428-2">(</span><span·class="p"·data-group-id="7487071428-2">)</span></code></pre><p>Specify·a·system·registry·that·Erlang·is·to·read·configuration·data·from.
190 <code·class="inline">win32</code>·is·the·only·valid·option.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1460681212-1">{</span><span·class="ss">host</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Aliases</span><span·class="p"·data-group-id="1460681212-1">}</span><span·class="p">.</span><span·class="w">190 <code·class="inline">win32</code>·is·the·only·valid·option.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9413238000-1">{</span><span·class="ss">host</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Aliases</span><span·class="p"·data-group-id="9413238000-1">}</span><span·class="p">.</span><span·class="w">
 191 ··</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tuple</span><span·class="p"·data-group-id="9413238000-2">(</span><span·class="p"·data-group-id="9413238000-2">)</span></code></pre><p><code·class="inline">Aliases·=·[string()]</code></p><p>Add·host·entry·to·the·hosts·table.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4069443856-1">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Domain</span><span·class="p"·data-group-id="4069443856-1">}</span><span·class="p">.</span><span·class="w">
 192 ··</span><span·class="n">Domain</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="4069443856-2">(</span><span·class="p"·data-group-id="4069443856-2">)</span></code></pre><p>Set·domain·name.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6217041344-1">{</span><span·class="ss">nameserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IP</span><span·class="w">·</span><span·class="p"·data-group-id="6217041344-2">[</span><span·class="p">,</span><span·class="n">Port</span><span·class="p"·data-group-id="6217041344-2">]</span><span·class="p"·data-group-id="6217041344-1">}</span><span·class="p">.</span><span·class="w">
191 ··</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tuple</span><span·class="p"·data-group-id="1460681212-2">(</span><span·class="p"·data-group-id="1460681212-2">)</span></code></pre><p><code·class="inline">Aliases·=·[string()]</code></p><p>Add·host·entry·to·the·hosts·table.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6854199355-1">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Domain</span><span·class="p"·data-group-id="6854199355-1">}</span><span·class="p">.</span><span·class="w"> 
192 ··</span><span·class="n">Domain</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="6854199355-2">(</span><span·class="p"·data-group-id="6854199355-2">)</span></code></pre><p>Set·domain·name.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3418535546-1">{</span><span·class="ss">nameserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IP</span><span·class="w">·</span><span·class="p"·data-group-id="3418535546-2">[</span><span·class="p">,</span><span·class="n">Port</span><span·class="p"·data-group-id="3418535546-2">]</span><span·class="p"·data-group-id="3418535546-1">}</span><span·class="p">.</span><span·class="w"> 
193 ··</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tuple</span><span·class="p"·data-group-id="3418535546-3">(</span><span·class="p"·data-group-id="3418535546-3">)</span><span·class="w"> 
194 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3418535546-4">(</span><span·class="p"·data-group-id="3418535546-4">)</span></code></pre><p>Add·address·(and·port,·if·other·than·default)·of·the·primary·nameserver·to·use 
195 for·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4622086337-1">{</span><span·class="ss">alt_nameserver</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IP</span><span·class="w">·</span><span·class="p"·data-group-id="4622086337-2">[</span><span·class="p">,</span><span·class="n">Port</span><span·class="p"·data-group-id="4622086337-2">]</span><span·class="p"·data-group-id="4622086337-1">}</span><span·class="p">.</span><span·class="w"> 
196 ··</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tuple</span><span·class="p"·data-group-id="4622086337-3">(</span><span·class="p"·data-group-id="4622086337-3">)</span><span·class="w">193 ··</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tuple</span><span·class="p"·data-group-id="6217041344-3">(</span><span·class="p"·data-group-id="6217041344-3">)</span><span·class="w">
197 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4622086337-4">(</span><span·class="p"·data-group-id="4622086337-4">)</span></code></pre><p>Add·address·(and·port,·if·other·than·default)·of·the·secondary·nameserver·for194 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6217041344-4">(</span><span·class="p"·data-group-id="6217041344-4">)</span></code></pre><p>Add·address·(and·port,·if·other·than·default)·of·the·primary·nameserver·to·use
198 <a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4496172619-1">{</span><span·class="ss">search</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Domains</span><span·class="p"·data-group-id="4496172619-1">}</span><span·class="p">.</span><span·class="w"> 
199 ··</span><span·class="n">Domains</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4496172619-2">[</span><span·class="nf">string</span><span·class="p"·data-group-id="4496172619-3">(</span><span·cla[·...·truncated·by·diffoscope;·len:·500,·SHA:·26f0041ea130eb11def8ac36b240ebf43dbfa8c523c79ad95b8d4b7f0b78e082·...·]-1">}</span><span·class="p">.</span><span·class="w">195 for·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4359868103-1">{</span><span·class="ss">alt_nameserver</span[·...·truncated·by·diffoscope;·len:·296,·SHA:·0d80f8978007ac33b9e762c3aa4b6146542859d9c6ed18f482c024c99a639283·...·]-1">}</span><span·class="p">.</span><span·class="w">
 196 ··</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tuple</span><span·class="p"·data-group-id="4359868103-3">(</span><span·class="p"·data-group-id="4359868103-3">)</span><span·class="w">
 197 ··</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4359868103-4">(</span><span·class="p"·data-group-id="4359868103-4">)</span></code></pre><p>Add·address·(and·port,·if·other·than·default)·of·the·secondary·nameserver·for
 198 <a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1552350065-1">{</span><span·class="ss">search</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Domains</span><span·class="p"·data-group-id="1552350065-1">}</span><span·class="p">.</span><span·class="w">
 199 ··</span><span·class="n">Domains</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1552350065-2">[</span><span·class="nf">string</span><span·class="p"·data-group-id="1552350065-3">(</span><span·class="p"·data-group-id="1552350065-3">)</span><span·class="p"·data-group-id="1552350065-2">]</span></code></pre><p>Add·search·domains·for·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1972800836-1">{</span><span·class="ss">lookup</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Methods</span><span·class="p"·data-group-id="1972800836-1">}</span><span·class="p">.</span><span·class="w">
200 ··</span><span·class="n">Methods</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1901891256-2">[</span><span·class="nf">atom</span><span·class="p"·data-group-id="1901891256-3">(</span><span·class="p"·data-group-id="1901891256-3">)</span><span·class="p"·data-group-id="1901891256-2">]</span></code></pre><p>Specify·lookup·methods·and·in·which·order·to·try·them.·The·valid·methods·are200 ··</span><span·class="n">Methods</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1972800836-2">[</span><span·class="nf">atom</span><span·class="p"·data-group-id="1972800836-3">(</span><span·class="p"·data-group-id="1972800836-3">)</span><span·class="p"·data-group-id="1972800836-2">]</span></code></pre><p>Specify·lookup·methods·and·in·which·order·to·try·them.·The·valid·methods·are
201 as·follows:</p><ul><li><code·class="inline">native</code>·(use·system·calls)</li><li><code·class="inline">file</code>·(use·host·data·retrieved·from·system·configuration·files·and/or·the201 as·follows:</p><ul><li><code·class="inline">native</code>·(use·system·calls)</li><li><code·class="inline">file</code>·(use·host·data·retrieved·from·system·configuration·files·and/or·the
202 user·configuration·file)</li><li><code·class="inline">dns</code>·(use·the·Erlang·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·for·nameserver·queries)</li></ul><p>The·lookup·method·<code·class="inline">string</code>·tries·to·parse·the·hostname·as·an·IPv4·or·IPv6202 user·configuration·file)</li><li><code·class="inline">dns</code>·(use·the·Erlang·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·for·nameserver·queries)</li></ul><p>The·lookup·method·<code·class="inline">string</code>·tries·to·parse·the·hostname·as·an·IPv4·or·IPv6
203 string·and·return·the·resulting·IP·address.·It·is·automatically·tried·first203 string·and·return·the·resulting·IP·address.·It·is·automatically·tried·first
204 when·<code·class="inline">native</code>·is·<em>not</em>·in·the·<code·class="inline">Methods</code>·list.·To·skip·it·in·this·case,·the204 when·<code·class="inline">native</code>·is·<em>not</em>·in·the·<code·class="inline">Methods</code>·list.·To·skip·it·in·this·case,·the
205 pseudo·lookup·method·<code·class="inline">nostring</code>·can·be·inserted·anywhere·in·the·<code·class="inline">Methods</code>205 pseudo·lookup·method·<code·class="inline">nostring</code>·can·be·inserted·anywhere·in·the·<code·class="inline">Methods</code>
206 list.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8329396248-1">{</span><span·class="ss">cache_size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="8329396248-1">}</span><span·class="p">.</span><span·class="w">206 list.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9457217058-1">{</span><span·class="ss">cache_size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="9457217058-1">}</span><span·class="p">.</span><span·class="w">
207 ··</span><span·class="n">Size</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8329396248-2">(</span><span·class="p"·data-group-id="8329396248-2">)</span></code></pre><p>Set·the·resolver·cache·size·for·<code·class="inline">dns</code>·lookups.·<code·class="inline">native</code>·lookups·are·not207 ··</span><span·class="n">Size</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9457217058-2">(</span><span·class="p"·data-group-id="9457217058-2">)</span></code></pre><p>Set·the·resolver·cache·size·for·<code·class="inline">dns</code>·lookups.·<code·class="inline">native</code>·lookups·are·not
208 cached.·Defaults·to·100·DNS·records.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7442106511-1">{</span><span·class="ss">cache_refresh</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Time</span><span·class="p"·data-group-id="7442106511-1">}</span><span·class="p">.</span><span·class="w">208 cached.·Defaults·to·100·DNS·records.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7054461098-1">{</span><span·class="ss">cache_refresh</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Time</span><span·class="p"·data-group-id="7054461098-1">}</span><span·class="p">.</span><span·class="w">
209 ··</span><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442106511-2">(</span><span·class="p"·data-group-id="7442106511-2">)</span></code></pre><p>Set·how·often·(in·milliseconds)·the·resolver·cache·for·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·is209 ··</span><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7054461098-2">(</span><span·class="p"·data-group-id="7054461098-2">)</span></code></pre><p>Set·how·often·(in·milliseconds)·the·resolver·cache·for·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·is
210 refreshed·(that·is,·expired·DNS·records·are·deleted).·Defaults·to·1·hour.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6100504304-1">{</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Time</span><span·class="p"·data-group-id="6100504304-1">}</span><span·class="p">.</span><span·class="w">210 refreshed·(that·is,·expired·DNS·records·are·deleted).·Defaults·to·1·hour.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8010067215-1">{</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Time</span><span·class="p"·data-group-id="8010067215-1">}</span><span·class="p">.</span><span·class="w">
211 ··</span><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6100504304-2">(</span><span·class="p"·data-group-id="6100504304-2">)</span></code></pre><p>Set·the·time·to·wait·until·retry·(in·milliseconds)·for·DNS·queries·made·by211 ··</span><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8010067215-2">(</span><span·class="p"·data-group-id="8010067215-2">)</span></code></pre><p>Set·the·time·to·wait·until·retry·(in·milliseconds)·for·DNS·queries·made·by
212 <a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.·Defaults·to·2·seconds.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3692308085-1">{</span><span·class="ss">retry</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="3692308085-1">}</span><span·class="p">.</span><span·class="w">212 <a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>.·Defaults·to·2·seconds.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2467038166-1">{</span><span·class="ss">retry</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="2467038166-1">}</span><span·class="p">.</span><span·class="w">
213 ··</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3692308085-2">(</span><span·class="p"·data-group-id="3692308085-2">)</span></code></pre><p>Set·the·number·of·DNS·queries·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·will·try·before·giving·up.·Defaults213 ··</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="2467038166-2">(</span><span·class="p"·data-group-id="2467038166-2">)</span></code></pre><p>Set·the·number·of·DNS·queries·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·will·try·before·giving·up.·Defaults
214 to·3.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9204271039-1">{</span><span·class="ss">servfail_retry_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Time</span><span·class="p"·data-group-id="9204271039-1">}</span><span·class="p">.</span><span·class="w">214 to·3.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5394442614-1">{</span><span·class="ss">servfail_retry_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Time</span><span·class="p"·data-group-id="5394442614-1">}</span><span·class="p">.</span><span·class="w">
215 ··</span><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="9204271039-2">(</span><span·class="p"·data-group-id="9204271039-2">)</span></code></pre><p>After·all·name·servers·have·been·tried,·there·is·a·timeout·before·the·name215 ··</span><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="5394442614-2">(</span><span·class="p"·data-group-id="5394442614-2">)</span></code></pre><p>After·all·name·servers·have·been·tried,·there·is·a·timeout·before·the·name
216 servers·are·tried·again.·This·is·to·prevent·the·server·from·answering·the216 servers·are·tried·again.·This·is·to·prevent·the·server·from·answering·the
217 query·with·what's·in·the·servfail·cache,217 query·with·what's·in·the·servfail·cache,
218 <a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html#servfail_retry_timeout"><code·class="inline">inet_res</code></a>.·Defaults·to·1500·milli218 <a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html#servfail_retry_timeout"><code·class="inline">inet_res</code></a>.·Defaults·to·1500·milli
219 seconds·.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7236342838-1">{</span><span·class="ss">inet6</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bool</span><span·class="p"·data-group-id="7236342838-1">}</span><span·class="p">.</span><span·class="w">219 seconds·.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4182301291-1">{</span><span·class="ss">inet6</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bool</span><span·class="p"·data-group-id="4182301291-1">}</span><span·class="p">.</span><span·class="w">
220 ··</span><span·class="n">Bool</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span></code></pre><p>Tells·the·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·to·look·up·IPv6·addresses.·Defaults·to220 ··</span><span·class="n">Bool</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span></code></pre><p>Tells·the·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·to·look·up·IPv6·addresses.·Defaults·to
221 <code·class="inline">false</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4337216862-1">{</span><span·class="ss">usevc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bool</span><span·class="p"·data-group-id="4337216862-1">}</span><span·class="p">.</span><span·class="w">221 <code·class="inline">false</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9289048365-1">{</span><span·class="ss">usevc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bool</span><span·class="p"·data-group-id="9289048365-1">}</span><span·class="p">.</span><span·class="w">
222 ··</span><span·class="n">Bool</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span></code></pre><p>Tells·the·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·to·use·TCP·(Virtual·Circuit)·instead·of·UDP.222 ··</span><span·class="n">Bool</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span></code></pre><p>Tells·the·DNS·client·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·to·use·TCP·(Virtual·Circuit)·instead·of·UDP.
223 Defaults·to·<code·class="inline">false</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8564146570-1">{</span><span·class="ss">edns</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version</span><span·class="p"·data-group-id="8564146570-1">}</span><span·class="p">.</span><span·class="w">223 Defaults·to·<code·class="inline">false</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9313710417-1">{</span><span·class="ss">edns</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version</span><span·class="p"·data-group-id="9313710417-1">}</span><span·class="p">.</span><span·class="w">
224 ··</span><span·class="n">Version</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="mi">0</span></code></pre><p>Sets·the·EDNS·version·that·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·will·use.·The·only·allowed·version·is224 ··</span><span·class="n">Version</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="mi">0</span></code></pre><p>Sets·the·EDNS·version·that·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·will·use.·The·only·allowed·version·is
225 zero.·Defaults·to·<code·class="inline">false</code>,·which·means·not·to·use·EDNS.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6400087609-1">{</span><span·class="ss">udp_payload_size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="6400087609-1">}</span><span·class="p">.</span><span·class="w">225 zero.·Defaults·to·<code·class="inline">false</code>,·which·means·not·to·use·EDNS.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6079582734-1">{</span><span·class="ss">udp_payload_size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="6079582734-1">}</span><span·class="p">.</span><span·class="w">
226 ··</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6400087609-2">(</span><span·class="p"·data-group-id="6400087609-2">)</span></code></pre><p>Sets·the·allowed·UDP·payload·size·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·will·advertise·in·EDNS·queries.226 ··</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6079582734-2">(</span><span·class="p"·data-group-id="6079582734-2">)</span></code></pre><p>Sets·the·allowed·UDP·payload·size·<a·href="../../../lib/kernel-10.2.6/doc/html/inet_res.html"><code·class="inline">inet_res</code></a>·will·advertise·in·EDNS·queries.
227 Also·sets·the·limit·when·the·DNS·query·will·be·deemed·too·large·for·UDP227 Also·sets·the·limit·when·the·DNS·query·will·be·deemed·too·large·for·UDP
228 forcing·a·TCP·query·instead;·this·is·not·entirely·correct,·as·the·advertised228 forcing·a·TCP·query·instead;·this·is·not·entirely·correct,·as·the·advertised
229 UDP·payload·size·of·the·individual·nameserver·is·what·is·to·be·used,·but·this229 UDP·payload·size·of·the·individual·nameserver·is·what·is·to·be·used,·but·this
230 simple·strategy·will·do·until·a·more·intelligent·(probing,·caching)·algorithm230 simple·strategy·will·do·until·a·more·intelligent·(probing,·caching)·algorithm
231 needs·to·be·implemented.·Default·to·1280,·which·stems·from·the·standard231 needs·to·be·implemented.·Default·to·1280,·which·stems·from·the·standard
232 Ethernet·MTU·size.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0186675344-1">{</span><span·class="ss">udp</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data-group-id="0186675344-1">}</span><span·class="p">.</span><span·class="w"> 
233 ··</span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0186675344-2">(</span><span·class="p"·data-group-id="0186675344-2">)</span></code></pre[·...·truncated·by·diffoscope;·len:·353,·SHA:·d9a740609ab3d044e3a3fa9fe9cfe84396ffcb173181911d2ef7f05d903cafc9·...·]-1">}</span><span·class="p">.</span><span·class="w">232 Ethernet·MTU·size.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8782706127-1">{</span><span·class="ss">udp</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·c1b19e2261ad6601f5e9ad0769aaae8ba5b1d4544cb09aa67cbcb6ddce0463ca·...·]-1">}</span><span·class="p">.</span><span·class="w">
 233 ··</span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="8782706127-2">(</span><span·class="p"·data-group-id="8782706127-2">)</span></code></pre><p>Tell·Erlang·to·use·another·primitive·UDP·module·than·<code·class="inline">inet_udp</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1569302088-1">{</span><span·class="ss">tcp</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p"·data-group-id="1569302088-1">}</span><span·class="p">.</span><span·class="w">
234 ··</span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="7424000870-2">(</span><span·class="p"·data-group-id="7424000870-2">)</span></code></pre><p>Tell·Erlang·to·use·another·primitive·TCP·module·than·<code·class="inline">inet_tcp</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">clear_hosts</span><span·class="p">.</span></code></pre><p>Clear·the·hosts·table.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">clear_ns</span><span·class="p">.</span></code></pre><p>Clear·the·list·of·recorded·nameservers·(primary·and·secondary).</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">clear_search</span><span·class="p">.</span></code></pre><p>Clear·the·list·of·search·domains.</p></li></ul><h2·id="user-configuration-example"·class="section-heading">234 ··</span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="1569302088-2">(</span><span·class="p"·data-group-id="1569302088-2">)</span></code></pre><p>Tell·Erlang·to·use·another·primitive·TCP·module·than·<code·class="inline">inet_tcp</code>.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">clear_hosts</span><span·class="p">.</span></code></pre><p>Clear·the·hosts·table.</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">clear_ns</span><span·class="p">.</span></code></pre><p>Clear·the·list·of·recorded·nameservers·(primary·and·secondary).</p></li><li><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">clear_search</span><span·class="p">.</span></code></pre><p>Clear·the·list·of·search·domains.</p></li></ul><h2·id="user-configuration-example"·class="section-heading">
235 ··<a·href="#user-configuration-example"·class="hover-link">235 ··<a·href="#user-configuration-example"·class="hover-link">
236 ····<i·class="ri-link-m"·aria-hidden="true"></i>236 ····<i·class="ri-link-m"·aria-hidden="true"></i>
237 ··</a>237 ··</a>
238 ··<span·class="text">User·Configuration·Example</span>238 ··<span·class="text">User·Configuration·Example</span>
239 </h2>239 </h2>
240 <p>Assume·that·a·user·does·not·want·Erlang·to·use·the·native·lookup·method,·but240 <p>Assume·that·a·user·does·not·want·Erlang·to·use·the·native·lookup·method,·but
241 wants·Erlang·to·read·all·information·necessary·from·start·and·use·that·for241 wants·Erlang·to·read·all·information·necessary·from·start·and·use·that·for
242 resolving·names·and·addresses.·If·lookup·fails,·Erlang·is·to·request·the·data242 resolving·names·and·addresses.·If·lookup·fails,·Erlang·is·to·request·the·data
243 from·a·nameserver·(using·the·Erlang·DNS·client,·set·to·use·EDNS·allowing·larger243 from·a·nameserver·(using·the·Erlang·DNS·client,·set·to·use·EDNS·allowing·larger
244 responses).·The·resolver·configuration·is·updated·when·its·configuration·file244 responses).·The·resolver·configuration·is·updated·when·its·configuration·file
245 changes.·Also,·DNS·records·are·never·to·be·cached.·The·user·configuration·file245 changes.·Also,·DNS·records·are·never·to·be·cached.·The·user·configuration·file
246 (in·this·example·named·<code·class="inline">erl_inetrc</code>,·stored·in·directory·<code·class="inline">./cfg_files</code>)·can·then246 (in·this·example·named·<code·class="inline">erl_inetrc</code>,·stored·in·directory·<code·class="inline">./cfg_files</code>)·can·then
247 look·as·follows·(Unix):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·--·ERLANG·INET·CONFIGURATION·FILE·--</span><span·class="w">247 look·as·follows·(Unix):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·--·ERLANG·INET·CONFIGURATION·FILE·--</span><span·class="w">
248 </span><span·class="c1">%%·read·the·hosts·file</span><span·class="w">248 </span><span·class="c1">%%·read·the·hosts·file</span><span·class="w">
249 </span><span·class="p"·data-group-id="8206598672-1">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/etc/hosts&quot;</span><span·class="p"·data-group-id="820659[·...·truncated·by·diffoscope;·len:·4,·SHA:·6058ce19ef73825a28584928a0a82ba45b01f6bbdd87c891c55ae2ba3e8f086b·...·]-1">}</span><span·class="p">.</span><span·class="w">249 </span><span·class="p"·data-group-id="8084550336-1">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/etc/hosts&quot;</span><span·class="p"·data-group-id="808455[·...·truncated·by·diffoscope;·len:·4,·SHA:·30fbbf29b70df63950b536c701293c67f9cb85f12a43652b1771f7249c7b3186·...·]-1">}</span><span·class="p">.</span><span·class="w">
250 </span><span·class="c1">%%·add·a·particular·host</span><span·class="w">250 </span><span·class="c1">%%·add·a·particular·host</span><span·class="w">
251 </span><span·class="p"·data-group-id="8206598672-2">{</span><span·class="ss">host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8206598672-3">{</span><span·class="mi">134</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·362,·SHA:·47d87c3a865c31b585d84feb30169f335d277c4cbf558a7f63ee398b167efacf·...·]-2">}</span><span·class="p">.</span><span·class="w">251 </span><span·class="p"·data-group-id="8084550336-2">{</span><span·class="ss">host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8084550336-3">{</span><span·class="mi">134</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·362,·SHA:·07e407c262207d1d2e33df22bf3679d0021ab1b5ff484dbda0fa8c3dfec187a8·...·]-2">}</span><span·class="p">.</span><span·class="w">
252 </span><span·class="c1">%%·do·not·monitor·the·hosts·file</span><span·class="w">252 </span><span·class="c1">%%·do·not·monitor·the·hosts·file</span><span·class="w">
253 </span><span·class="p"·data-group-id="8206598672-5">{</span><span·class="ss">hosts_file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p"·data-group-id="8206598672-5">}</span><span·class="p">.</span><span·class="w">253 </span><span·class="p"·data-group-id="8084550336-5">{</span><span·class="ss">hosts_file</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p"·data-group-id="8084550336-5">}</span><span·class="p">.</span><span·class="w">
254 </span><span·class="c1">%%·read·and·monitor·nameserver·config·from·here</span><span·class="w">254 </span><span·class="c1">%%·read·and·monitor·nameserver·config·from·here</span><span·class="w">
255 </span><span·class="p"·data-group-id="8206598672-6">{</span><span·class="ss">resolv_conf</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/usr/local/etc/resolv.conf&quot;</span><span·class="p"·data-group-id="8206598672-6">}</span><span·class="p">.</span><span·class="w">255 </span><span·class="p"·data-group-id="8084550336-6">{</span><span·class="ss">resolv_conf</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/usr/local/etc/resolv.conf&quot;</span><span·class="p"·data-group-id="8084550336-6">}</span><span·class="p">.</span><span·class="w">
256 </span><span·class="c1">%%·enable·EDNS</span><span·class="w">256 </span><span·class="c1">%%·enable·EDNS</span><span·class="w">
257 </span><span·class="p"·data-group-id="8206598672-7">{</span><span·class="ss">edns</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="8206598672-7">}</span><span·class="p">.</span><span·class="w">257 </span><span·class="p"·data-group-id="8084550336-7">{</span><span·class="ss">edns</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="8084550336-7">}</span><span·class="p">.</span><span·class="w">
258 </span><span·class="c1">%%·disable·caching</span><span·class="w">258 </span><span·class="c1">%%·disable·caching</span><span·class="w">
259 </span><span·class="p"·data-group-id="8206598672-8">{</span><span·class="ss">cache_size</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="8206598672-8">}</span><span·class="p">.</span><span·class="w">259 </span><span·class="p"·data-group-id="8084550336-8">{</span><span·class="ss">cache_size</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="8084550336-8">}</span><span·class="p">.</span><span·class="w">
260 </span><span·class="c1">%%·specify·lookup·method</span><span·class="w">260 </span><span·class="c1">%%·specify·lookup·method</span><span·class="w">
261 </span><span·class="p"·data-group-id="8206598672-9">{</span><span·class="ss">lookup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8206598672-10">[</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">dns</span>[·...·truncated·by·diffoscope;·len:·95,·SHA:·75a71af730d965990f1a1f74fee462b73099d47f006b54f9adff5f2ea560c913·...·]-9">}</span><span·class="p">.</span></code></pre><p>And·Erlang·can,·for·example,·be·started·as·follows:</p><pre><code·class="text">%·erl·-sname·my_node·-kernel·inetrc·'&quot;./cfg_files/erl_inetrc&quot;'</code></pre>261 </span><span·class="p"·data-group-id="8084550336-9">{</span><span·class="ss">lookup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8084550336-10">[</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">dns</span>[·...·truncated·by·diffoscope;·len:·95,·SHA:·d7fd99ff88633b6770d8eb217b2e37f25291ed2eb9fe06bf7cc6f13783877d79·...·]-9">}</span><span·class="p">.</span></code></pre><p>And·Erlang·can,·for·example,·be·started·as·follows:</p><pre><code·class="text">%·erl·-sname·my_node·-kernel·inetrc·'&quot;./cfg_files/erl_inetrc&quot;'</code></pre>
262 </div>262 </div>
  
263 <div·class="bottom-actions"·id="bottom-actions">263 <div·class="bottom-actions"·id="bottom-actions">
264 ··<div·class="bottom-actions-item">264 ··<div·class="bottom-actions-item">
  
265 ······<a·href="driver.html"·class="bottom-actions-button"·rel="prev">265 ······<a·href="driver.html"·class="bottom-actions-button"·rel="prev">
266 ········<span·class="subheader">266 ········<span·class="subheader">
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301 ······<p·class="built-using">301 ······<p·class="built-using">
302 ········Built·using302 ········Built·using
303 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the303 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
304 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>304 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
305 ······</p>305 ······</p>
306 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>306 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
307 ····</footer>307 ····</footer>
308 ··</div>308 ··</div>
309 </main>309 </main>
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157 BF</code></pre><p>If·multiple·<code·class="inline">-eval</code>·expressions·are·specified,·they·are·evaluated·sequentially157 BF</code></pre><p>If·multiple·<code·class="inline">-eval</code>·expressions·are·specified,·they·are·evaluated·sequentially
158 in·the·order·specified.·<code·class="inline">-eval</code>·expressions·are·evaluated·sequentially·with158 in·the·order·specified.·<code·class="inline">-eval</code>·expressions·are·evaluated·sequentially·with
159 <code·class="inline">-s</code>·and·<code·class="inline">-run</code>·function·calls·(this·also·in·the·order·specified).·As·with159 <code·class="inline">-s</code>·and·<code·class="inline">-run</code>·function·calls·(this·also·in·the·order·specified).·As·with
160 <code·class="inline">-s</code>·and·<code·class="inline">-run</code>,·an·evaluation·that·does·not·terminate·blocks·the·system160 <code·class="inline">-s</code>·and·<code·class="inline">-run</code>,·an·evaluation·that·does·not·terminate·blocks·the·system
161 initialization·process.</p></li><li><p><strong><code·class="inline">-extra</code></strong>·-·Everything·following·<code·class="inline">-extra</code>·is·considered·plain·arguments·and161 initialization·process.</p></li><li><p><strong><code·class="inline">-extra</code></strong>·-·Everything·following·<code·class="inline">-extra</code>·is·considered·plain·arguments·and
162 can·be·retrieved·using·<a·href="#get_plain_arguments/0"><code·class="inline">get_plain_arguments/0</code></a>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-extra·+A·1·--</span><span·class="w">162 can·be·retrieved·using·<a·href="#get_plain_arguments/0"><code·class="inline">get_plain_arguments/0</code></a>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-extra·+A·1·--</span><span·class="w">
163 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">163 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
164 1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="3484519122-1">(</span><span·class="p"·data-group-id="3484519122-1">)</span><span·class="p">.</span><span·class="w">164 1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="2179928305-1">(</span><span·class="p"·data-group-id="2179928305-1">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p"·data-group-id="3484519122-2">[</span><span·class="s">&quot;+A&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="s">&quot;--&quot;</span><span·class="p"·data-group-id="3484519122-2">]</span></code></pre><p>The·<code·class="inline">-extra</code>·flag·can·be·passed·on·the·command·line,·through·<code·class="inline">ERL_*FLAGS</code>·or165 </span><span·class="p"·data-group-id="2179928305-2">[</span><span·class="s">&quot;+A&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="s">&quot;--&quot;</span><span·class="p"·data-group-id="2179928305-2">]</span></code></pre><p>The·<code·class="inline">-extra</code>·flag·can·be·passed·on·the·command·line,·through·<code·class="inline">ERL_*FLAGS</code>·or
166 <code·class="inline">-args_file</code>.·It·only·effects·the·remaining·command-line·flags·in·the·entity166 <code·class="inline">-args_file</code>.·It·only·effects·the·remaining·command-line·flags·in·the·entity
167 in·which·it·is·passed.·If·multiple·<code·class="inline">-extra</code>·flags·are·passed·they·are167 in·which·it·is·passed.·If·multiple·<code·class="inline">-extra</code>·flags·are·passed·they·are
168 concatenated·using·the·same·order·rules·as·<code·class="inline">ERL_*FLAGS</code>·or·<code·class="inline">-args_file</code>·in168 concatenated·using·the·same·order·rules·as·<code·class="inline">ERL_*FLAGS</code>·or·<code·class="inline">-args_file</code>·in
169 which·they·are·given.</p><p>Example:</p><pre><code·class="text">%·ERL_AFLAGS=&quot;-extra·a&quot;·ERL_ZFLAGS=&quot;-extra·d&quot;·erl·-extra·b·-extra·c169 which·they·are·given.</p><p>Example:</p><pre><code·class="text">%·ERL_AFLAGS=&quot;-extra·a&quot;·ERL_ZFLAGS=&quot;-extra·d&quot;·erl·-extra·b·-extra·c
170 ...170 ...
171 1&gt;·init:get_plain_arguments().171 1&gt;·init:get_plain_arguments().
172 [&quot;a&quot;,&quot;b&quot;,&quot;-extra&quot;,&quot;c&quot;,&quot;d&quot;]</code></pre></li><li><p><strong><code·class="inline">-S·Mod·[Func·[Arg1,·Arg2,·...]]</code></strong>·-·Evaluates·the·specified·function·call172 [&quot;a&quot;,&quot;b&quot;,&quot;-extra&quot;,&quot;c&quot;,&quot;d&quot;]</code></pre></li><li><p><strong><code·class="inline">-S·Mod·[Func·[Arg1,·Arg2,·...]]</code></strong>·-·Evaluates·the·specified·function·call
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212 ····<i·class="ri-link-m"·aria-hidden="true"></i>212 ····<i·class="ri-link-m"·aria-hidden="true"></i>
213 ··</a>213 ··</a>
214 ··<span·class="text">Example</span>214 ··<span·class="text">Example</span>
215 </h2>215 </h2>
216 <pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·--·a·b·-children·thomas·claire·-ages·7·3·--·x·y</span><span·class="w">216 <pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·--·a·b·-children·thomas·claire·-ages·7·3·--·x·y</span><span·class="w">
217 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">217 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
218 </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="8733460069-1">(</span><span·class="p"·data-group-id="8733460069-1">)</span><span·class="p">.</span><span·class="w">218 </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_plain_arguments</span><span·class="p"·data-group-id="8778532937-1">(</span><span·class="p"·data-group-id="8778532937-1">)</span><span·class="p">.</span><span·class="w">
219 </span><span·class="p"·data-group-id="8733460069-2">[</span><span·class="s">&quot;a&quot;</span><span·class="p">,</span><span·class="s">&quot;b&quot;</span><span·class="p">,</span><span·class="s">&quot;x&quot;</span><span·class="p">,</span><span·class="s">&quot;y&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·148bf5ca66b5c591238e304a4f0b5f686f391b91a1b598a528251f4e5354cf98·...·]-2">]</span><span·class="gp·unselectable">219 </span><span·class="p"·data-group-id="8778532937-2">[</span><span·class="s">&quot;a&quot;</span><span·class="p">,</span><span·class="s">&quot;b&quot;</span><span·class="p">,</span><span·class="s">&quot;x&quot;</span><span·class="p">,</span><span·class="s">&quot;y&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·9ec504259bc858333e047f0ac4e1c030d18ad75668eb3fc065ca9510b9061c4b·...·]-2">]</span><span·class="gp·unselectable">
220 2&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8733460069-3">(</span><span·class="ss">children</span><span·class="p"·data-group-id="8733460069-3">)</span><span·class="p">.</span><span·class="w">220 2&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8778532937-3">(</span><span·class="ss">children</span><span·class="p"·data-group-id="8778532937-3">)</span><span·class="p">.</span><span·class="w">
221 </span><span·class="p"·data-group-id="8733460069-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8733460069-5">[</span><span·class="p"·data-group-id="8733460069-6">[</span><span·class="s">&quot;thomas&quot;</span><span·class="p">,</span><span·class="s"[·...·truncated·by·diffoscope;·len:·173,·SHA:·49afcf1906e35a0e37fb296987d6a63da80a198ec1b3d3d52729c18bc2f5278f·...·]-4">}</span><span·class="gp·unselectable">221 </span><span·class="p"·data-group-id="8778532937-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8778532937-5">[</span><span·class="p"·data-group-id="8778532937-6">[</span><span·class="s">&quot;thomas&quot;</span><span·class="p">,</span><span·class="s"[·...·truncated·by·diffoscope;·len:·173,·SHA:·5e029c121405122fdec6581a08376542e13f74363a524df5136dfded991bbc16·...·]-4">}</span><span·class="gp·unselectable">
222 3&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8733460069-7">(</span><span·class="ss">ages</span><span·class="p"·data-group-id="8733460069-7">)</span><span·class="p">.</span><span·class="w">222 3&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8778532937-7">(</span><span·class="ss">ages</span><span·class="p"·data-group-id="8778532937-7">)</span><span·class="p">.</span><span·class="w">
223 </span><span·class="p"·data-group-id="8733460069-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8733460069-9">[</span><span·class="p"·data-group-id="8733460069-10">[</span><span·class="s">&quot;7&quot;</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·189,·SHA:·dd67625587d65286c6cda2d4b9b37e6377c385de4f00f3aedb256ce2aaf18ccb·...·]-8">}</span><span·class="gp·unselectable">223 </span><span·class="p"·data-group-id="8778532937-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8778532937-9">[</span><span·class="p"·data-group-id="8778532937-10">[</span><span·class="s">&quot;7&quot;</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·189,·SHA:·3c0a9e1e718eed53d4fe1af6df7f39ca984c5684c45f35a7b6870eb63a955fea·...·]-8">}</span><span·class="gp·unselectable">
224 4&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8733460069-11">(</span><span·class="ss">silly</span><span·class="p"·data-group-id="8733460069-11">)</span><span·class="p">.</span><span·class="w">224 4&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="8778532937-11">(</span><span·class="ss">silly</span><span·class="p"·data-group-id="8778532937-11">)</span><span·class="p">.</span><span·class="w">
225 </span><span·class="ss">error</span></code></pre><h2·id="module-see-also"·class="section-heading">225 </span><span·class="ss">error</span></code></pre><h2·id="module-see-also"·class="section-heading">
226 ··<a·href="#module-see-also"·class="hover-link">226 ··<a·href="#module-see-also"·class="hover-link">
227 ····<i·class="ri-link-m"·aria-hidden="true"></i>227 ····<i·class="ri-link-m"·aria-hidden="true"></i>
228 ··</a>228 ··</a>
229 ··<span·class="text">See·Also</span>229 ··<span·class="text">See·Also</span>
230 </h2>230 </h2>
231 <p><a·href="erl_prim_loader.html"><code·class="inline">erl_prim_loader</code></a>,·<a·href="../../../lib/kernel-10.2.6/doc/html/heart.html"><code·class="inline">heart</code></a></p>231 <p><a·href="erl_prim_loader.html"><code·class="inline">erl_prim_loader</code></a>,·<a·href="../../../lib/kernel-10.2.6/doc/html/heart.html"><code·class="inline">heart</code></a></p>
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512 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_argument(Flag)·->·{ok,·Arg}·|·error·when·Flag·::·<a·href="erlang.html#t:atom/0">atom</a>(),·Arg·::·[Values·::·[<a·href="erlang.html#t:string/0">string</a>()]].</pre>512 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_argument(Flag)·->·{ok,·Arg}·|·error·when·Flag·::·<a·href="erlang.html#t:atom/0">atom</a>(),·Arg·::·[Values·::·[<a·href="erlang.html#t:string/0">string</a>()]].</pre>
  
513 ······</div>513 ······</div>
  
514 <p>Returns·all·values·associated·with·the·command-line·user·flag·<code·class="inline">Flag</code>.</p><p>If·<code·class="inline">Flag</code>·is·provided·several·times,·each·<code·class="inline">Values</code>·is·returned·in·preserved·order.514 <p>Returns·all·values·associated·with·the·command-line·user·flag·<code·class="inline">Flag</code>.</p><p>If·<code·class="inline">Flag</code>·is·provided·several·times,·each·<code·class="inline">Values</code>·is·returned·in·preserved·order.
515 Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-a·b·c·-a·d</span><span·class="w">515 Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-a·b·c·-a·d</span><span·class="w">
516 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">516 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
517 1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="3797869513-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="3797869513-1">)</span><span·class="p">.</span><span·class="w">517 1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="3274837791-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="3274837791-1">)</span><span·class="p">.</span><span·class="w">
518 </span><span·class="p"·data-group-id="3797869513-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3797869513-3">[</span><span·class="p"·data-group-id="3797869513-4">[</span><span·class="s">&quot;b&quot;</span><span·class="p">,</span><span·class="s">&qu[·...·truncated·by·diffoscope;·len:·330,·SHA:·12cd20e6acfc7a55f24757de8d3d91f19c51ebce6c6559fd45e35ebd966c30f3·...·]-2">}</span></code></pre><p>The·following·flags·are·defined·automatically·and·can·be·retrieved·using·this518 </span><span·class="p"·data-group-id="3274837791-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3274837791-3">[</span><span·class="p"·data-group-id="3274837791-4">[</span><span·class="s">&quot;b&quot;</span><span·class="p">,</span><span·class="s">&qu[·...·truncated·by·diffoscope;·len:·330,·SHA:·aac6769e7372852d525c98ffee603cb731b64855bc0aeb2246107957935daa2f·...·]-2">}</span></code></pre><p>The·following·flags·are·defined·automatically·and·can·be·retrieved·using·this
519 function:</p><ul><li><p><strong><code·class="inline">root</code></strong>·-·The·installation·directory·of·Erlang/OTP,·<code·class="inline">$ROOT</code>:</p><pre><code·class="text">2&gt;·init:get_argument(root).519 function:</p><ul><li><p><strong><code·class="inline">root</code></strong>·-·The·installation·directory·of·Erlang/OTP,·<code·class="inline">$ROOT</code>:</p><pre><code·class="text">2&gt;·init:get_argument(root).
520 {ok,[[&quot;/usr/local/otp/releases/otp_beam_solaris8_r10b_patched&quot;]]}</code></pre></li><li><p><strong><code·class="inline">progname</code></strong>·-·The·name·of·the·program·which·started·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="2546964405-1">(</span><span·class="ss">progname</span><span·class="p"·data-group-id="2546964405-1">)</span><span·class="p">.</span><span·class="w">520 {ok,[[&quot;/usr/local/otp/releases/otp_beam_solaris8_r10b_patched&quot;]]}</code></pre></li><li><p><strong><code·class="inline">progname</code></strong>·-·The·name·of·the·program·which·started·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="3827852787-1">(</span><span·class="ss">progname</span><span·class="p"·data-group-id="3827852787-1">)</span><span·class="p">.</span><span·class="w">
521 </span><span·class="p"·data-group-id="2546964405-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2546964405-3">[</span><span·class="p"·data-group-id="2546964405-4">[</span><span·class="s">&quot;erl&quot;</span><span·class="p"·data-group-id="2546964405-4">]</span><span·class="p"·data-group-id="2546964405-3">]</span><span·class="p"·data-group-id="2546964405-2">}</span></code></pre></li><li><p><strong><code·class="inline"·id="home">home</code></strong>·-·The·home·directory·(on·Unix,·the·value·of·$HOME):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_argument</span><span·class="p"·data-group-id="1362264512-1">(</span><span·class="ss">home</span><span·class="p"·data-group-id="1362264512-1">)</span><span·class="p">.</span><span·class="w"> 
522 </span><span·class="p"·data-group-id="1362264512-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1362264512-3">[</span><span·class="p"·data-group-id="1362264512-4">[</span><span·class="s">&quot;/home/harry&quot;</span><span·class="p"·data-group-id="1[·...·truncated·by·diffoscope;·len:·262,·SHA:·91540d51e780503990725927f3477e90292b9f64effc0a2e3458f9c4634a622f·...·]>521 </span><span·class="p"·data-group-id="3827852787-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3827852787-3">[</span><span·class="p"·data-group-id="3827852787-4">[</span><span·class="s">&quot;erl&quot;</span><span·class="p"·data-group-id="382785278[·...·truncated·by·diffoscope;·len:·611,·SHA:·90ec9391acb30a8b745cbeeab690a8f983273e1b814b135fefeb29c654860d68·...·]>
 522 </span><span·class="p"·data-group-id="6914336108-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6914336108-3">[</span><span·class="p"·data-group-id="6914336108-4">[</span><span·class="s">&quot;/home/harry&quot;</span><span·class="p"·data-group-id="6914336108-4">]</span><span·class="p"·data-group-id="6914336108-3">]</span><span·class="p"·data-group-id="6914336108-2">}</span></code></pre></li></ul><p>Returns·<code·class="inline">error</code>·if·no·value·is·associated·with·<code·class="inline">Flag</code>.</p>
523 ··</section>523 ··</section>
524 </section>524 </section>
525 <section·class="detail"·id="get_arguments/0">525 <section·class="detail"·id="get_arguments/0">
  
526 ··<div·class="detail-header">526 ··<div·class="detail-header">
527 ····<a·href="#get_arguments/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">527 ····<a·href="#get_arguments/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
528 ······<i·class="ri-link-m"·aria-hidden="true"></i>528 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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797 ······<p·class="built-using">797 ······<p·class="built-using">
798 ········Built·using798 ········Built·using
799 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the799 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
800 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>800 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
801 ······</p>801 ······</p>
802 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>802 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
803 ····</footer>803 ····</footer>
804 ··</div>804 ··</div>
805 </main>805 </main>
806 </div>806 </div>
807 <script>807 <script>
808 ··function·mermaidLoaded()·{808 ··function·mermaidLoaded()·{
809 ····mermaid.initialize({809 ····mermaid.initialize({
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184 ······<p·class="built-using">184 ······<p·class="built-using">
185 ········Built·using185 ········Built·using
186 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the186 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
188 ······</p>188 ······</p>
189 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>189 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
190 ····</footer>190 ····</footer>
191 ··</div>191 ··</div>
192 </main>192 </main>
193 </div>193 </div>
194 <script>194 <script>
195 ··function·mermaidLoaded()·{195 ··function·mermaidLoaded()·{
196 ····mermaid.initialize({196 ····mermaid.initialize({
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367 language,·that·is,·for·their·side·effects.·Functions·with·side·effects·are·also367 language,·that·is,·for·their·side·effects.·Functions·with·side·effects·are·also
368 allowed·when·tracing.</p><h2·id="tracing-examples"·class="section-heading">368 allowed·when·tracing.</p><h2·id="tracing-examples"·class="section-heading">
369 ··<a·href="#tracing-examples"·class="hover-link">369 ··<a·href="#tracing-examples"·class="hover-link">
370 ····<i·class="ri-link-m"·aria-hidden="true"></i>370 ····<i·class="ri-link-m"·aria-hidden="true"></i>
371 ··</a>371 ··</a>
372 ··<span·class="text">Tracing·Examples</span>372 ··<span·class="text">Tracing·Examples</span>
373 </h2>373 </h2>
374 <p>Match·an·argument·list·of·three,·where·the·first·and·third·arguments·are·equal:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9839695437-1">[</span><span·class="p"·data-group-id="9839695437-2">{</span><span·class="p"·data-group-id="9839695437-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·cla[·...·truncated·by·diffoscope;·len:·116,·SHA:·6d0d7d258dc3bdfaff7125e06956403824fe7abfb7c018704e37720d8fe0095c·...·]-3">]</span><span·class="p">,</span><span·class="w">374 <p>Match·an·argument·list·of·three,·where·the·first·and·third·arguments·are·equal:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1239212383-1">[</span><span·class="p"·data-group-id="1239212383-2">{</span><span·class="p"·data-group-id="1239212383-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·cla[·...·truncated·by·diffoscope;·len:·116,·SHA:·76e6989156e066a33fb1d0fe96a5a4e1c5a71b89a1e40570303a4286f021aec5·...·]-3">]</span><span·class="p">,</span><span·class="w">
375 ··</span><span·class="p"·data-group-id="9839695437-4">[</span><span·class="p"·data-group-id="9839695437-4">]</span><span·class="p">,</span><span·class="w">375 ··</span><span·class="p"·data-group-id="1239212383-4">[</span><span·class="p"·data-group-id="1239212383-4">]</span><span·class="p">,</span><span·class="w">
376 ··</span><span·class="p"·data-group-id="9839695437-5">[</span><span·class="p"·data-group-id="9839695437-5">]</span><span·class="p"·data-group-id="9839695437-2">}</span><span·class="p"·data-group-id="9839695437-1">]</span></code></pre><p>Match·an·argument·list·of·three,·where·the·second·argument·[·...·truncated·by·diffoscope;·len:·473,·SHA:·f08c924d054c2f16951a2a6b9d88fa7529d2ee83e5e4c37a663eaf000ff2bcb8·...·]-3">]</span><span·class="p">,</span><span·class="w">376 ··</span><span·class="p"·data-group-id="1239212383-5">[</span><span·class="p"·data-group-id="1239212383-5">]</span><span·class="p"·data-group-id="1239212383-2">}</span><span·class="p"·data-group-id="1239212383-1">]</span></code></pre><p>Match·an·argument·list·of·three,·where·the·second·argument·[·...·truncated·by·diffoscope;·len:·473,·SHA:·4b12a01354a4ba692f2d99267d2b7ddb21769eaa80b545196e2366b64556dff1·...·]-3">]</span><span·class="p">,</span><span·class="w">
377 ··</span><span·class="p"·data-group-id="6971132500-4">[</span><span·class="p"·data-group-id="6971132500-5">{</span><span·class="w">·</span><span·class="ss">&#39;&gt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·131,·SHA:·d5e67d765f6c25d2d0452ea0fad1676bddbb63037a48cb1355a5449a73c578ff·...·]-4">]</span><span·class="p">,</span><span·class="w">377 ··</span><span·class="p"·data-group-id="6572916388-4">[</span><span·class="p"·data-group-id="6572916388-5">{</span><span·class="w">·</span><span·class="ss">&#39;&gt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·131,·SHA:·d519b89a86d783c50c1df2d677a395223f387ea3888e7a5ed17f269974a7cde1·...·]-4">]</span><span·class="p">,</span><span·class="w">
378 ··</span><span·class="p"·data-group-id="6971132500-6">[</span><span·class="p"·data-group-id="6971132500-6">]</span><span·class="p"·data-group-id="6971132500-2">}</span><span·class="p"·data-group-id="6971132500-1">]</span></code></pre><p>Match·an·argument·list·of·three,·where·the·third·argument·is·either·a·tuple378 ··</span><span·class="p"·data-group-id="6572916388-6">[</span><span·class="p"·data-group-id="6572916388-6">]</span><span·class="p"·data-group-id="6572916388-2">}</span><span·class="p"·data-group-id="6572916388-1">]</span></code></pre><p>Match·an·argument·list·of·three,·where·the·third·argument·is·either·a·tuple
379 containing·argument·one·and·two,·<em>or</em>·a·list·beginning·with·argument·one·and·two379 containing·argument·one·and·two,·<em>or</em>·a·list·beginning·with·argument·one·and·two
380 (that·is,·<code·class="inline">[a,b,[a,b,c]]</code>·or·<code·class="inline">[a,b,{a,b}]</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7983877296-1">[</span><span·class="p"·data-group-id="7983877296-2">{</span><span·class="p"·data-group-id="7983877296-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·cl[·...·truncated·by·diffoscope;·len:·117,·SHA:·db29909d9686112f89b96afaa5bc82a97b2d2a08d7cc150577bd7b563d9aacbd·...·]-3">]</span><span·class="p">,</span><span·class="w">380 (that·is,·<code·class="inline">[a,b,[a,b,c]]</code>·or·<code·class="inline">[a,b,{a,b}]</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0450261675-1">[</span><span·class="p"·data-group-id="0450261675-2">{</span><span·class="p"·data-group-id="0450261675-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·cl[·...·truncated·by·diffoscope;·len:·117,·SHA:·80ab13184db506ef6a370aefa9599b84f095a2480e69300a8d5c604bc315b6bf·...·]-3">]</span><span·class="p">,</span><span·class="w">
381 ··</span><span·class="p"·data-group-id="7983877296-4">[</span><span·class="p"·data-group-id="7983877296-5">{</span><span·class="ss">&#39;orelse&#39;</span><span·class="p">,</span><span·class="w">381 ··</span><span·class="p"·data-group-id="0450261675-4">[</span><span·class="p"·data-group-id="0450261675-5">{</span><span·class="ss">&#39;orelse&#39;</span><span·class="p">,</span><span·class="w">
382 ······</span><span·class="p"·data-group-id="7983877296-6">{</span><span·class="ss">&#39;=:=&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$3&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7983877296-7">{</span><span·class=[·...·truncated·by·diffoscope;·len:·284,·SHA:·4953af96224e9b9409d6217fb875fff3692c21cd1b48ad6465826dfe7746e816·...·]-6">}</span><span·class="p">,</span><span·class="w">382 ······</span><span·class="p"·data-group-id="0450261675-6">{</span><span·class="ss">&#39;=:=&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$3&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0450261675-7">{</span><span·class=[·...·truncated·by·diffoscope;·len:·284,·SHA:·eccc657002c7bf52b7d091e2e2374ac3c9ea8e3514caab7d71740e57b6c8a784·...·]-6">}</span><span·class="p">,</span><span·class="w">
383 ······</span><span·class="p"·data-group-id="7983877296-9">{</span><span·class="ss">&#39;and&#39;</span><span·class="p">,</span><span·class="w">383 ······</span><span·class="p"·data-group-id="0450261675-9">{</span><span·class="ss">&#39;and&#39;</span><span·class="p">,</span><span·class="w">
384 ········</span><span·class="p"·data-group-id="7983877296-10">{</span><span·class="ss">&#39;=:=&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7983877296-11">{</span><span·clas[·...·truncated·by·diffoscope;·len:·195,·SHA:·94f000850118b6ed99228eb1dc875b752cc643401fcbfe5fedae3211affc8ed4·...·]-10">}</span><span·class="p">,</span><span·class="w">384 ········</span><span·class="p"·data-group-id="0450261675-10">{</span><span·class="ss">&#39;=:=&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0450261675-11">{</span><span·clas[·...·truncated·by·diffoscope;·len:·195,·SHA:·9d51630437df58be1f6782f22d875acb531a90d189ad3d79e65fc0cc676de821·...·]-10">}</span><span·class="p">,</span><span·class="w">
385 ········</span><span·class="p"·data-group-id="7983877296-12">{</span><span·class="ss">&#39;=:=&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7983877296-13">{</span><span·clas[·...·truncated·by·diffoscope;·len:·537,·SHA:·a8e67aba13bc59713512c9da827d9d630d7612fee8042a1e4d3fedc92ef6a21b·...·]-4">]</span><span·class="p">,</span><span·class="w">385 ········</span><span·class="p"·data-group-id="0450261675-12">{</span><span·class="ss">&#39;=:=&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0450261675-13">{</span><span·clas[·...·truncated·by·diffoscope;·len:·537,·SHA:·1b16e92b421ee6efd3eddb9cd91245e35051820adfe72c11eda202194300d065·...·]-4">]</span><span·class="p">,</span><span·class="w">
386 ··</span><span·class="p"·data-group-id="7983877296-15">[</span><span·class="p"·data-group-id="7983877296-15">]</span><span·class="p"·data-group-id="7983877296-2">}</span><span·class="p"·data-group-id="7983877296-1">]</span></code></pre><p>The·above·problem·can·also·be·solved·as·follows:</p><pre>[·...·truncated·by·diffoscope;·len:·411,·SHA:·dd3a5286bc95631bc44e45ae7db42c2247f31fef7c00cacab33569d2e8194dc3·...·]-4">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2}],·[],·[]},386 ··</span><span·class="p"·data-group-id="0450261675-15">[</span><span·class="p"·data-group-id="0450261675-15">]</span><span·class="p"·data-group-id="0450261675-2">}</span><span·class="p"·data-group-id="0450261675-1">]</span></code></pre><p>The·above·problem·can·also·be·solved·as·follows:</p><pre>[·...·truncated·by·diffoscope;·len:·411,·SHA:·e14b61f34c6ddc1b0a8d23919cb23de8a72c90985bc88e9ef807eb00d5341213·...·]-4">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2}],·[],·[]},
387 ·{[&#39;</span><span·class="sc">$1</span><span·class="ss">&#39;,·&#39;</span><span·class="sc">$2</span><span·class="ss">&#39;,·[&#39;</span><span·class="sc">$1</span><span·class="ss">&#39;,·&#39;</span><span·class="sc">$2</span><span·class="ss">&#39;·|·&#39;</span><span·class="p">_</span><span·class="err">&#39;</span><span·class="p">]</span><span·class="p">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9733352826-5">[</span><span·class="p"·data-group-id="9733352826-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9733352826-6">[</span><span·class="p"·data-group-id="9733352826-6">]</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·67,·SHA:·8d4f243d9b4321b97a4b775868b7d3ee55a30f5dbd7732b6760b0ff416d2f1d3·...·]-3">]</span></code></pre><p>Match·two·arguments,·where·the·first·is·a·tuple·beginning·with·a·list·that·in387 ·{[&#39;</span><span·class="sc">$1</span><span·class="ss">&#39;,·&#39;</span><span·class="sc">$2</span><span·class="ss">&#39;,·[&#39;</span><span·class="sc">$1</span><span·class="ss">&#39;,·&#39;</span><span·class="sc">$2</span><span·class="ss">&#39;·|·&#39;</span><span·class="p">_</span><span·class="err">&#39;</span><span·class="p">]</span><span·class="p">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7404889203-5">[</span><span·class="p"·data-group-id="7404889203-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7404889203-6">[</span><span·class="p"·data-group-id="7404889203-6">]</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·67,·SHA:·780ab12e65a28e716bab1b2902610a46510ce3453acdc8071ea604908273e503·...·]-3">]</span></code></pre><p>Match·two·arguments,·where·the·first·is·a·tuple·beginning·with·a·list·that·in
388 turn·begins·with·the·second·argument·times·two·(that·is,·<code·class="inline">[{[4,x],y},2]</code>·or388 turn·begins·with·the·second·argument·times·two·(that·is,·<code·class="inline">[{[4,x],y},2]</code>·or
389 <code·class="inline">[{[8],·y,·z},4])</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5503363867-1">[</span><span·class="p"·data-group-id="5503363867-2">{</span><span·class="p"·data-group-id="5503363867-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·cl[·...·truncated·by·diffoscope;·len:·1174,·SHA:·a26302af059411401c0c7b058873ad0495b2e19c8751ed751c893b0f3287d63a·...·]-4">]</span><span·class="p">,</span><span·class="w">389 <code·class="inline">[{[8],·y,·z},4])</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3105436754-1">[</span><span·class="p"·data-group-id="3105436754-2">{</span><span·class="p"·data-group-id="3105436754-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·cl[·...·truncated·by·diffoscope;·len:·1174,·SHA:·179ab0ba639c469625d9078cc4dacbb9f3e819016729ebb76d0abc36c136b78d·...·]-4">]</span><span·class="p">,</span><span·class="w">
390 ··</span><span·class="p"·data-group-id="5503363867-9">[</span><span·class="p"·data-group-id="5503363867-9">]</span><span·class="p"·data-group-id="5503363867-2">}</span><span·class="p"·data-group-id="5503363867-1">]</span></code></pre><p>Match·three·arguments.·When·all·three·are·equal·and·are·numbers,·append·the390 ··</span><span·class="p"·data-group-id="3105436754-9">[</span><span·class="p"·data-group-id="3105436754-9">]</span><span·class="p"·data-group-id="3105436754-2">}</span><span·class="p"·data-group-id="3105436754-1">]</span></code></pre><p>Match·three·arguments.·When·all·three·are·equal·and·are·numbers,·append·the
391 process·dump·to·the·trace·message,·otherwise·let·the·trace·message·be·&quot;as·is&quot;,391 process·dump·to·the·trace·message,·otherwise·let·the·trace·message·be·&quot;as·is&quot;,
392 but·set·the·sequential·trace·token·label·to·4711:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8363834201-1">[</span><span·class="p"·data-group-id="8363834201-2">{</span><span·class="p"·data-group-id="8363834201-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·cl[·...·truncated·by·diffoscope;·len:·117,·SHA:·ff965d8d812c3950a3b460079327a7c160d9f2d9b05d635f5f08e77f82afa3f6·...·]-3">]</span><span·class="p">,</span><span·class="w">392 but·set·the·sequential·trace·token·label·to·4711:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2181639142-1">[</span><span·class="p"·data-group-id="2181639142-2">{</span><span·class="p"·data-group-id="2181639142-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·cl[·...·truncated·by·diffoscope;·len:·117,·SHA:·b11ba49ae151d3bba12625f7e017d0813d42b84862773580f0bbe1c8a05f19ad·...·]-3">]</span><span·class="p">,</span><span·class="w">
393 ··</span><span·class="p"·data-group-id="8363834201-4">[</span><span·class="p"·data-group-id="8363834201-5">{</span><span·class="nb">is_number</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="8363834201-5">}</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·9fa390dc7f0be416d720f8073c05e00faa090cee1325a9cbde3f22d7a31a62d3·...·]-4">]</span><span·class="p">,</span><span·class="w">393 ··</span><span·class="p"·data-group-id="2181639142-4">[</span><span·class="p"·data-group-id="2181639142-5">{</span><span·class="nb">is_number</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="2181639142-5">}</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·53f1c242a8a3bc5024947bf6152b5d59611adcf268b17957cd37b163e685c257·...·]-4">]</span><span·class="p">,</span><span·class="w">
394 ··</span><span·class="p"·data-group-id="8363834201-6">[</span><span·class="p"·data-group-id="8363834201-7">{</span><span·class="ss">message</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8363834201-8">{</span><span·class="ss">process_dump</span><span·class="[·...·truncated·by·diffoscope;·len:·187,·SHA:·a4375897d7a0daab625f917c0d2846001bbfbb0b6f2eaa3bdedb2a683e494e79·...·]-2">}</span><span·class="p">,</span><span·class="w">394 ··</span><span·class="p"·data-group-id="2181639142-6">[</span><span·class="p"·data-group-id="2181639142-7">{</span><span·class="ss">message</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2181639142-8">{</span><span·class="ss">process_dump</span><span·class="[·...·truncated·by·diffoscope;·len:·187,·SHA:·b97b2ac3c44e2110bbfaabe1fa7620c524aeae1cc3d50b41cc553522c40bfa2e·...·]-2">}</span><span·class="p">,</span><span·class="w">
395 ·</span><span·class="p"·data-group-id="8363834201-9">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8363834201-10">[</span><span·class="p"·data-group-id="8363834201-10">]</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·505,·SHA:·b4d6532a78b6d3f4fc587d1243e33285d8be99a23d49d6f37f15de938a4926c0·...·]-1">]</span></code></pre><p>As·can·be·noted·above,·the·parameter·list·can·be·matched·against·a·single395 ·</span><span·class="p"·data-group-id="2181639142-9">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2181639142-10">[</span><span·class="p"·data-group-id="2181639142-10">]</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·505,·SHA:·3f2f5a7803b0177c9ea724c7e6f32942754acb82003ba16f4000153875f865d8·...·]-1">]</span></code></pre><p>As·can·be·noted·above,·the·parameter·list·can·be·matched·against·a·single
396 <code·class="inline">MatchVariable</code>·or·an·<code·class="inline">'_'</code>.·To·replace·the·whole·parameter·list·with·a·single396 <code·class="inline">MatchVariable</code>·or·an·<code·class="inline">'_'</code>.·To·replace·the·whole·parameter·list·with·a·single
397 variable·is·a·special·case.·In·all·other·cases·the·<code·class="inline">MatchHead</code>·must·be·a397 variable·is·a·special·case.·In·all·other·cases·the·<code·class="inline">MatchHead</code>·must·be·a
398 <em>proper</em>·list.</p><p>Generate·a·trace·message·only·if·the·trace·control·word·is·set·to·1:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9877247047-1">[</span><span·class="p"·data-group-id="9877247047-2">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">398 <em>proper</em>·list.</p><p>Generate·a·trace·message·only·if·the·trace·control·word·is·set·to·1:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4645469276-1">[</span><span·class="p"·data-group-id="4645469276-2">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
399 ··</span><span·class="p"·data-group-id="9877247047-3">[</span><span·class="p"·data-group-id="9877247047-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="9877247047-5">{</span><span·class="ss">get_tcw</span><span·class="p"·data-group-id="987724[·...·truncated·by·diffoscope;·len:·342,·SHA:·655dd2d2db7a727a0f5d8d3524a3454b507c1caf0f4552e0534dfe8f46980463·...·]-3">]</span><span·class="p">,</span><span·class="w">399 ··</span><span·class="p"·data-group-id="4645469276-3">[</span><span·class="p"·data-group-id="4645469276-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4645469276-5">{</span><span·class="ss">get_tcw</span><span·class="p"·data-group-id="464546[·...·truncated·by·diffoscope;·len:·342,·SHA:·9cf779b6b57ebb93a528db0602ae82027296754e381e095c985a92f9861fa090·...·]-3">]</span><span·class="p">,</span><span·class="w">
400 ··</span><span·class="p"·data-group-id="9877247047-7">[</span><span·class="p"·data-group-id="9877247047-7">]</span><span·class="p"·data-group-id="9877247047-2">}</span><span·class="p"·data-group-id="9877247047-1">]</span></code></pre><p>Generate·a·trace·message·only·if·there·is·a·<code·class="in[·...·truncated·by·diffoscope;·len:·175,·SHA:·294672a0664061d77a4229e20acc9b244f4d24c5f8f6c995e90207cf8ecda76d·...·]-2">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">400 ··</span><span·class="p"·data-group-id="4645469276-7">[</span><span·class="p"·data-group-id="4645469276-7">]</span><span·class="p"·data-group-id="4645469276-2">}</span><span·class="p"·data-group-id="4645469276-1">]</span></code></pre><p>Generate·a·trace·message·only·if·there·is·a·<code·class="in[·...·truncated·by·diffoscope;·len:·175,·SHA:·64ae2586fd5b7932e30e1e27a9b89cc57638e023a5aa3d984ab20a256ee6cb57·...·]-2">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">
401 ··</span><span·class="p"·data-group-id="8998506915-3">[</span><span·class="p"·data-group-id="8998506915-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="8998506915-5">{</span><span·class="ss">is_seq_trace</span><span·class="p"·data-group-id="8998506915-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="8998506915-6">{</span><span·class="ss">const</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="8998506915-6">}</span><span·class="p"·data-group-id="8998506915-4">}</span><span·class="p"·data-group-id="8998506915-3">]</span><span·class="p">,</span><span·class="w"> 
402 ··</span><span·class="p"·data-group-id="8998506915-7">[</span><span·class="p"·data-group-id="8998506915-7">]</span><span·class="p"·data-group-id="8998506915-2">}</span><span·class="p"·data-group-id="8998506915-1">]</span></code></pre><p>Remove·the·<code·class="inline">'silent'</code>·trace·flag·[·...·truncated·by·diffoscope;·len:·73,·SHA:·1d0ce4d7e6c1157d0f96d007d7ffcfbdaad817ac5d1db9e129886d5c923c76a7·...·]401 ··</span><span·class="p"·data-group-id="3363794423-3">[</span><span·class="p"·data-group-id="3363794423-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3363794423-5">{</span><span·class="ss">is_seq_trace</span><span·class="p"·data-group-id="3[·...·truncated·by·diffoscope;·len:·399,·SHA:·46e308e814cc63a7e43dc75c7acd573a2db866000534bae3c079da6b1b138021·...·]
 402 ··</span><span·class="p"·data-group-id="3363794423-7">[</span><span·class="p"·data-group-id="3363794423-7">]</span><span·class="p"·data-group-id="3363794423-2">}</span><span·class="p"·data-group-id="3363794423-1">]</span></code></pre><p>Remove·the·<code·class="inline">'silent'</code>·trace·flag·when·the·first·argument·is·<code·class="inline">'verbose'</code>,·and·add
403 it·when·it·is·<code·class="inline">'silent':</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6557854818-1">[</span><span·class="p"·data-group-id="6557854818-2">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">403 it·when·it·is·<code·class="inline">'silent':</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3352311443-1">[</span><span·class="p"·data-group-id="3352311443-2">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
404 ··</span><span·class="p"·data-group-id="6557854818-3">[</span><span·class="p"·data-group-id="6557854818-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="6557854818-5">{</span><span·class="nb">hd</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·244,·SHA:·57bb305528cae4bf063cc555e0d8f2a30abace55438901092068050430dbebbc·...·]-3">]</span><span·class="p">,</span><span·class="w">404 ··</span><span·class="p"·data-group-id="3352311443-3">[</span><span·class="p"·data-group-id="3352311443-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3352311443-5">{</span><span·class="nb">hd</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·244,·SHA:·2f023ffde288f0b5c0f036ed36edd2f013d11d077a3aebd4e0f3bc90e82e85eb·...·]-3">]</span><span·class="p">,</span><span·class="w">
405 ··</span><span·class="p"·data-group-id="6557854818-6">[</span><span·class="p"·data-group-id="6557854818-7">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6557854818-8">[</span><span·class="ss">silent</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·309,·SHA:·1564d4b4ad609a00cd63e8ca412ec668a14606e9fe21c1a377908e0f204dee4e·...·]-2">}</span><span·class="p">,</span><span·class="w">405 ··</span><span·class="p"·data-group-id="3352311443-6">[</span><span·class="p"·data-group-id="3352311443-7">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3352311443-8">[</span><span·class="ss">silent</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·309,·SHA:·c301e897c79d69ce3583b581e8811f88b433c07af0a66de0c50f7a51dfde6971·...·]-2">}</span><span·class="p">,</span><span·class="w">
406 ·</span><span·class="p"·data-group-id="6557854818-10">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">406 ·</span><span·class="p"·data-group-id="3352311443-10">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
407 ··</span><span·class="p"·data-group-id="6557854818-11">[</span><span·class="p"·data-group-id="6557854818-12">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="6557854818-13">{</span><span·class="nb">hd</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·248,·SHA:·8c475ba0954e371290d5e016ed9aa043d4fdb07a793d81eb3d6e658a05c47fb3·...·]-11">]</span><span·class="p">,</span><span·class="w">407 ··</span><span·class="p"·data-group-id="3352311443-11">[</span><span·class="p"·data-group-id="3352311443-12">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3352311443-13">{</span><span·class="nb">hd</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·248,·SHA:·82ca4b2d1c396cd5dd2f5f3297e324ec1917779c04c9e055214aced9517aeb6c·...·]-11">]</span><span·class="p">,</span><span·class="w">
408 ··</span><span·class="p"·data-group-id="6557854818-14">[</span><span·class="p"·data-group-id="6557854818-15">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6557854818-16">[</span><span·class="p"·data-group-id="6557854818-16">]<[·...·truncated·by·diffoscope;·len:·630,·SHA:·715d2e5eea2b6f7800afdbd9cc644bc677e7e053a53188de36be799b395b0763·...·]-2">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">408 ··</span><span·class="p"·data-group-id="3352311443-14">[</span><span·class="p"·data-group-id="3352311443-15">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3352311443-16">[</span><span·class="p"·data-group-id="3352311443-16">]<[·...·truncated·by·diffoscope;·len:·630,·SHA:·20d48837b3b09701d4b1aea0441eb1ea00e794ddf1500351340dd58fa7898bf7·...·]-2">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
409 ··</span><span·class="p"·data-group-id="4563288660-3">[</span><span·class="p"·data-group-id="4563288660-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4563288660-5">{</span><span·class="nb">length</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·242,·SHA:·ce996daa5b39c8957523c205cd96654958a853d618fcb6b3efc663d1bdf4d99c·...·]-3">]</span><span·class="p">,</span><span·class="w">409 ··</span><span·class="p"·data-group-id="3780303027-3">[</span><span·class="p"·data-group-id="3780303027-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3780303027-5">{</span><span·class="nb">length</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·242,·SHA:·80a88cbd7402050e19d36185789eed817b2be96b6e144551c805e616fe0e8aeb·...·]-3">]</span><span·class="p">,</span><span·class="w">
410 ··</span><span·class="p"·data-group-id="4563288660-6">[</span><span·class="p"·data-group-id="4563288660-7">{</span><span·class="ss">return_trace</span><span·class="p"·data-group-id="4563288660-7">}</span><span·class="p"·data-group-id="4563288660-6">]</span><span·class="p"·data-group-id="45632886[·...·truncated·by·diffoscope;·len:·2,·SHA:·39fa9ec190eee7b6f4dff1100d6343e10918d044c75eac8f9e9a2596173f80c9·...·]-2">}</span><span·class="p">,</span><span·class="w">410 ··</span><span·class="p"·data-group-id="3780303027-6">[</span><span·class="p"·data-group-id="3780303027-7">{</span><span·class="ss">return_trace</span><span·class="p"·data-group-id="3780303027-7">}</span><span·class="p"·data-group-id="3780303027-6">]</span><span·class="p"·data-group-id="37803030[·...·truncated·by·diffoscope;·len:·2,·SHA:·670671cd97404156226e507973f2ab8330d3022ca96e0c93bdbdb320c41adcaf·...·]-2">}</span><span·class="p">,</span><span·class="w">
411 ·</span><span·class="p"·data-group-id="4563288660-8">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4563288660-9">[</span><span·class="p"·data-group-id="4563288660-9">]</span><span·class="p">,</span><span·class="p"·data-group-id="4563288660-10"[·...·truncated·by·diffoscope;·len:·157,·SHA:·49eef159b966e029874044e1de57be2f82a63978349325f90d587dde613472d0·...·]-1">]</span></code></pre><p>Generate·a·trace·message·only·if·the·function·is·of·arity·3·and·the·first411 ·</span><span·class="p"·data-group-id="3780303027-8">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3780303027-9">[</span><span·class="p"·data-group-id="3780303027-9">]</span><span·class="p">,</span><span·class="p"·data-group-id="3780303027-10"[·...·truncated·by·diffoscope;·len:·157,·SHA:·be0bd9391a466f5846e423af403a0417163567ae976526fd2a765b7d58dccf09·...·]-1">]</span></code></pre><p>Generate·a·trace·message·only·if·the·function·is·of·arity·3·and·the·first
412 argument·is·<code·class="inline">'trace'</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5864123843-1">[</span><span·class="p"·data-group-id="5864123843-2">{</span><span·class="p"·data-group-id="5864123843-3">[</span><span·class="ss">&#39;trace&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·72,·SHA:·349b7ad88ffeafc60581f0f51e4e62d4754ecb90329b49469a7758e3e7e3cd0d·...·]-3">]</span><span·class="p">,</span><span·class="w">412 argument·is·<code·class="inline">'trace'</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1326400494-1">[</span><span·class="p"·data-group-id="1326400494-2">{</span><span·class="p"·data-group-id="1326400494-3">[</span><span·class="ss">&#39;trace&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·72,·SHA:·f07f0b7cbf08ca478a1d21da428cc7540b3505790d0e44a427f5244eaa9a3a9a·...·]-3">]</span><span·class="p">,</span><span·class="w">
413 ··</span><span·class="p"·data-group-id="5864123843-4">[</span><span·class="p"·data-group-id="5864123843-4">]</span><span·class="p">,</span><span·class="w">413 ··</span><span·class="p"·data-group-id="1326400494-4">[</span><span·class="p"·data-group-id="1326400494-4">]</span><span·class="p">,</span><span·class="w">
414 ··</span><span·class="p"·data-group-id="5864123843-5">[</span><span·class="p"·data-group-id="5864123843-5">]</span><span·class="p"·data-group-id="5864123843-2">}</span><span·class="p">,</span><span·class="w">414 ··</span><span·class="p"·data-group-id="1326400494-5">[</span><span·class="p"·data-group-id="1326400494-5">]</span><span·class="p"·data-group-id="1326400494-2">}</span><span·class="p">,</span><span·class="w">
415 ·</span><span·class="p"·data-group-id="5864123843-6">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="5864123843-7">[</span><span·class="p"·data-group-id="5864123843-7">]</span><span·class="p">,</span><span·class="p"·data-group-id="5864123843-8">[·...·truncated·by·diffoscope;·len:·155,·SHA:·079fc02d55073dfbdd6947dca71bde1705e39c0f4526b59643c116818c982dcf·...·]-1">]</span></code></pre><h2·id="ets-examples"·class="section-heading">415 ·</span><span·class="p"·data-group-id="1326400494-6">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="1326400494-7">[</span><span·class="p"·data-group-id="1326400494-7">]</span><span·class="p">,</span><span·class="p"·data-group-id="1326400494-8">[·...·truncated·by·diffoscope;·len:·155,·SHA:·95aa3f191d827e6a8fe10d5e3887026e3787cca63742e6699630b7a1a947a63d·...·]-1">]</span></code></pre><h2·id="ets-examples"·class="section-heading">
416 ··<a·href="#ets-examples"·class="hover-link">416 ··<a·href="#ets-examples"·class="hover-link">
417 ····<i·class="ri-link-m"·aria-hidden="true"></i>417 ····<i·class="ri-link-m"·aria-hidden="true"></i>
418 ··</a>418 ··</a>
419 ··<span·class="text">ETS·Examples</span>419 ··<span·class="text">ETS·Examples</span>
420 </h2>420 </h2>
421 <p>Match·all·objects·in·an·ETS·table,·where·the·first·element·is·the·atom421 <p>Match·all·objects·in·an·ETS·table,·where·the·first·element·is·the·atom
422 <code·class="inline">'strider'</code>·and·the·tuple·arity·is·3,·and·return·the·whole·object:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7882615234-1">[</span><span·class="p"·data-group-id="7882615234-2">{</span><span·class="p"·data-group-id="7882615234-3">{</span><span·class="ss">strider</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="s[·...·truncated·by·diffoscope;·len:·61,·SHA:·2973ffbc4d96c8e30708addcdd12012765f30da75d5389aa9463ec8b27d62d05·...·]4-3">}</span><span·class="p">,</span><span·class="w">422 <code·class="inline">'strider'</code>·and·the·tuple·arity·is·3,·and·return·the·whole·object:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5278736644-1">[</span><span·class="p"·data-group-id="5278736644-2">{</span><span·class="p"·data-group-id="5278736644-3">{</span><span·class="ss">strider</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="s[·...·truncated·by·diffoscope;·len:·61,·SHA:·2657458c8688739eddf010c51d5ba09357533b22d5bc06744d840e085681b1ea·...·]4-3">}</span><span·class="p">,</span><span·class="w">
423 ··</span><span·class="p"·data-group-id="7882615234-4">[</span><span·class="p"·data-group-id="7882615234-4">]</span><span·class="p">,</span><span·class="w">423 ··</span><span·class="p"·data-group-id="5278736644-4">[</span><span·class="p"·data-group-id="5278736644-4">]</span><span·class="p">,</span><span·class="w">
424 ··</span><span·class="p"·data-group-id="7882615234-5">[</span><span·class="ss">&#39;$_&#39;</span><span·class="p"·data-group-id="7882615234-5">]</span><span·class="p"·data-group-id="7882615234-2">}</span><span·class="p"·data-group-id="7882615234-1">]</span></code></pre><p>Match·all·objects·in·an·ETS·table·with·arity·&gt;·1·and·the·first·element·is424 ··</span><span·class="p"·data-group-id="5278736644-5">[</span><span·class="ss">&#39;$_&#39;</span><span·class="p"·data-group-id="5278736644-5">]</span><span·class="p"·data-group-id="5278736644-2">}</span><span·class="p"·data-group-id="5278736644-1">]</span></code></pre><p>Match·all·objects·in·an·ETS·table·with·arity·&gt;·1·and·the·first·element·is
425 'gandalf',·and·return·element·2:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5498315706-1">[</span><span·class="p"·data-group-id="5498315706-2">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">425 'gandalf',·and·return·element·2:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2675303856-1">[</span><span·class="p"·data-group-id="2675303856-2">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
426 ··</span><span·class="p"·data-group-id="5498315706-3">[</span><span·class="p"·data-group-id="5498315706-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">gandalf</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·829,·SHA:·520975d890e65b16f919229c0a9ba93497f7389861edf9d833047dfeae5ca3ef·...·]6-3">]</span><span·class="p">,</span><span·class="w">426 ··</span><span·class="p"·data-group-id="2675303856-3">[</span><span·class="p"·data-group-id="2675303856-4">{</span><span·class="ss">&#39;==&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">gandalf</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·829,·SHA:·09210bbdaf3d457145b51368f66b4597d2d29c408f20dd8c7c4863e3bbb67e1a·...·]6-3">]</span><span·class="p">,</span><span·class="w">
427 ··</span><span·class="p"·data-group-id="5498315706-8">[</span><span·class="p"·data-group-id="5498315706-9">{</span><span·class="nb">element</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="5498315706[·...·truncated·by·diffoscope;·len:·158,·SHA:·489d2ac948712ca2456a9704a8ad560f804aef9e40af11eb43f64cd9e9457de5·...·]6-1">]</span></code></pre><p>In·this·example,·if·the·first·element·had·been·the·key,·it·is·much·more427 ··</span><span·class="p"·data-group-id="2675303856-8">[</span><span·class="p"·data-group-id="2675303856-9">{</span><span·class="nb">element</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="2675303856[·...·truncated·by·diffoscope;·len:·158,·SHA:·954699c99a77a208e157b4878f8ea28b672969a3c6b6c2b8d8d361991b363054·...·]6-1">]</span></code></pre><p>In·this·example,·if·the·first·element·had·been·the·key,·it·is·much·more
428 efficient·to·match·that·key·in·the·<code·class="inline">MatchHead</code>·part·than·in·the428 efficient·to·match·that·key·in·the·<code·class="inline">MatchHead</code>·part·than·in·the
429 <code·class="inline">MatchConditions</code>·part.·The·search·space·of·the·tables·is·restricted·with429 <code·class="inline">MatchConditions</code>·part.·The·search·space·of·the·tables·is·restricted·with
430 regards·to·the·<code·class="inline">MatchHead</code>·so·that·only·objects·with·the·matching·key·are430 regards·to·the·<code·class="inline">MatchHead</code>·so·that·only·objects·with·the·matching·key·are
431 searched.</p><p>Match·tuples·of·three·elements,·where·the·second·element·is·either·<code·class="inline">'merry'</code>·or431 searched.</p><p>Match·tuples·of·three·elements,·where·the·second·element·is·either·<code·class="inline">'merry'</code>·or
432 <code·class="inline">'pippin'</code>,·and·return·the·whole·objects:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7811129347-1">[</span><span·class="p"·data-group-id="7811129347-2">{</span><span·class="p"·data-group-id="7811129347-3">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">merry</span><span·class="p">,</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·60,·SHA:·e421aa8557c7f13f2306fce5803189e0209600e876c9ef712dc3e75fa7f91a26·...·]-3">}</span><span·class="p">,</span><span·class="w">432 <code·class="inline">'pippin'</code>,·and·return·the·whole·objects:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9859579136-1">[</span><span·class="p"·data-group-id="9859579136-2">{</span><span·class="p"·data-group-id="9859579136-3">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">merry</span><span·class="p">,</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·60,·SHA:·5421c4d413852b9959158ccd33325fd3be59f38bf74a53ad6375f771ed228339·...·]-3">}</span><span·class="p">,</span><span·class="w">
433 ··</span><span·class="p"·data-group-id="7811129347-4">[</span><span·class="p"·data-group-id="7811129347-4">]</span><span·class="p">,</span><span·class="w">433 ··</span><span·class="p"·data-group-id="9859579136-4">[</span><span·class="p"·data-group-id="9859579136-4">]</span><span·class="p">,</span><span·class="w">
434 ··</span><span·class="p"·data-group-id="7811129347-5">[</span><span·class="ss">&#39;$_&#39;</span><span·class="p"·data-group-id="7811129347-5">]</span><span·class="p"·data-group-id="7811129347-2">}</span><span·class="p">,</span><span·class="w">434 ··</span><span·class="p"·data-group-id="9859579136-5">[</span><span·class="ss">&#39;$_&#39;</span><span·class="p"·data-group-id="9859579136-5">]</span><span·class="p"·data-group-id="9859579136-2">}</span><span·class="p">,</span><span·class="w">
435 ·</span><span·class="p"·data-group-id="7811129347-6">{</span><span·class="p"·data-group-id="7811129347-7">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">pippin</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="78[·...·truncated·by·diffoscope;·len:·8,·SHA:·7bcfeca5923d95a3f186cf0e0024a3d6690f8aa7dcc531dc04275390e40255b2·...·]-7">}</span><span·class="p">,</span><span·class="w">435 ·</span><span·class="p"·data-group-id="9859579136-6">{</span><span·class="p"·data-group-id="9859579136-7">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">pippin</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="98[·...·truncated·by·diffoscope;·len:·8,·SHA:·6739119f22162183fd1e137661eb66947a60f2f71fe08f5e0aae4c3d760a6a02·...·]-7">}</span><span·class="p">,</span><span·class="w">
436 ··</span><span·class="p"·data-group-id="7811129347-8">[</span><span·class="p"·data-group-id="7811129347-8">]</span><span·class="p">,</span><span·class="w">436 ··</span><span·class="p"·data-group-id="9859579136-8">[</span><span·class="p"·data-group-id="9859579136-8">]</span><span·class="p">,</span><span·class="w">
437 ··</span><span·class="p"·data-group-id="7811129347-9">[</span><span·class="ss">&#39;$_&#39;</span><span·class="p"·data-group-id="7811129347-9">]</span><span·class="p"·data-group-id="7811129347-6">}</span><span·class="p"·data-group-id="7811129347-1">]</span></code></pre><p>Function·<a·href="../../../lib/stdlib-6.2.2/doc/html/ets.html#test_ms/2"><code·class="inline">ets:test_ms/2</code></a>·can·be·useful·for·testing·complicated·ETS·matches.</p>437 ··</span><span·class="p"·data-group-id="9859579136-9">[</span><span·class="ss">&#39;$_&#39;</span><span·class="p"·data-group-id="9859579136-9">]</span><span·class="p"·data-group-id="9859579136-6">}</span><span·class="p"·data-group-id="9859579136-1">]</span></code></pre><p>Function·<a·href="../../../lib/stdlib-6.2.2/doc/html/ets.html#test_ms/2"><code·class="inline">ets:test_ms/2</code></a>·can·be·useful·for·testing·complicated·ETS·matches.</p>
438 </div>438 </div>
  
439 <div·class="bottom-actions"·id="bottom-actions">439 <div·class="bottom-actions"·id="bottom-actions">
440 ··<div·class="bottom-actions-item">440 ··<div·class="bottom-actions-item">
  
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442 ········<span·class="subheader">442 ········<span·class="subheader">
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478 ········Built·using478 ········Built·using
479 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the479 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
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481 ······</p>481 ······</p>
482 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>482 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
483 ····</footer>483 ····</footer>
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485 </main>485 </main>
486 </div>486 </div>
487 <script>487 <script>
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489 ····mermaid.initialize({489 ····mermaid.initialize({
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212 <ul><li><p><a·href="../../../lib/kernel-10.2.6/doc/html/gen_sctp.html#peeloff/2"><code·class="inline">gen_sctp:peeloff/2</code></a>·has·been·fixed·to·inherit·socket·options·to·the·peeled·off·socket·more·like·<a·href="../../../lib/kernel-10.2.6/doc/html/gen_tcp.html#accept/1"><code·class="inline">gen_tcp:accept/1</code></a>,·for·example·the·options·<code·class="inline">tos</code>·or·<code·class="inline">tclass</code>.</p><p>When·setting·SCTP·options·that·are·unsupported·on·the·platform,·some·should·be·silently·ignored,·but·a·bug·caused·the·option·parsing·to·derail·so·the·options·after·could·bail·out·and·cause·an·error·instead.··This·has·been·fixed.</p><p>Own·Id:·OTP-19225·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8789"·title="">PR-8789</a></p></li><li><p>Fixed·a·bug·where·Erlang·would·corrupt·the·terminal·settings·if·stdin·was·a·TTY·but·stdout·was·not.</p><p>Own·Id:·OTP-19232·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8794"·title="">PR-8794</a>,·<a·href="https://github.com/erlang/otp/issues/8487"·title="">GH-8487</a></p></li><li><p>Fixed·a·bug·in·the·non-JIT·VM·when·loading·a·NIF·over·a·function·that·is·already·traced·by·more·than·one·session.·This·caused·a·VM·crash.·This·bug·has·existed·since·OTP-27.0,·where·multiple·trace·sessions·were·introduced.</p><p>Own·Id:·OTP-19248·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8856"·title="">PR-8856</a></p></li><li><p>Fixed·a·bug·where·the·loading·of·modules·with·extremely·large·binary·construction·instructions·crashed·the·emulator·on·AArch64.</p><p>Own·Id:·OTP-19261·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8815"·title="">GH-8815</a>,·<a·href="https://github.com/erlang/otp/pull/8816"·title="">PR-8816</a></p></li><li><p><a·href="../../../lib/kernel-10.2.6/doc/html/inet.html#getifaddrs/1"><code·class="inline">inet:getifaddrs/0,1</code></a>·is·improved·when·using212 <ul><li><p><a·href="../../../lib/kernel-10.2.6/doc/html/gen_sctp.html#peeloff/2"><code·class="inline">gen_sctp:peeloff/2</code></a>·has·been·fixed·to·inherit·socket·options·to·the·peeled·off·socket·more·like·<a·href="../../../lib/kernel-10.2.6/doc/html/gen_tcp.html#accept/1"><code·class="inline">gen_tcp:accept/1</code></a>,·for·example·the·options·<code·class="inline">tos</code>·or·<code·class="inline">tclass</code>.</p><p>When·setting·SCTP·options·that·are·unsupported·on·the·platform,·some·should·be·silently·ignored,·but·a·bug·caused·the·option·parsing·to·derail·so·the·options·after·could·bail·out·and·cause·an·error·instead.··This·has·been·fixed.</p><p>Own·Id:·OTP-19225·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8789"·title="">PR-8789</a></p></li><li><p>Fixed·a·bug·where·Erlang·would·corrupt·the·terminal·settings·if·stdin·was·a·TTY·but·stdout·was·not.</p><p>Own·Id:·OTP-19232·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8794"·title="">PR-8794</a>,·<a·href="https://github.com/erlang/otp/issues/8487"·title="">GH-8487</a></p></li><li><p>Fixed·a·bug·in·the·non-JIT·VM·when·loading·a·NIF·over·a·function·that·is·already·traced·by·more·than·one·session.·This·caused·a·VM·crash.·This·bug·has·existed·since·OTP-27.0,·where·multiple·trace·sessions·were·introduced.</p><p>Own·Id:·OTP-19248·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8856"·title="">PR-8856</a></p></li><li><p>Fixed·a·bug·where·the·loading·of·modules·with·extremely·large·binary·construction·instructions·crashed·the·emulator·on·AArch64.</p><p>Own·Id:·OTP-19261·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8815"·title="">GH-8815</a>,·<a·href="https://github.com/erlang/otp/pull/8816"·title="">PR-8816</a></p></li><li><p><a·href="../../../lib/kernel-10.2.6/doc/html/inet.html#getifaddrs/1"><code·class="inline">inet:getifaddrs/0,1</code></a>·is·improved·when·using
213 inet_backend·=·socket.</p><p>Own·Id:·OTP-19264</p></li><li><p><a·href="../../../lib/stdlib-6.2.2/doc/html/win32reg.html#value/2"><code·class="inline">win32reg:value/2</code></a>·will·no·longer·crash·the·emulator·when·the·value·is·an·unterminated·REG_SZ·of·size·0.</p><p>Own·Id:·OTP-19283·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8903"·title="">GH-8903</a>,·<a·href="https://github.com/erlang/otp/pull/8912"·title="">PR-8912</a></p></li><li><p><code·class="inline">Makefile</code>·dependency·generation·on·Windows·in·WSL·2·has·been·corrected.</p><p>Own·Id:·OTP-19300·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8955"·title="">PR-8955</a></p></li><li><p>Fix·lock·order·violation·if·a·NIF·monitor·<code·class="inline">down</code>·callback·calls·<code·class="inline">enif_whereis_pid</code>.·Would·cause·debug·emulator·to·crash·but·could·potentially·lead·to·deadlocks·in·optimized·emulator.</p><p>Own·Id:·OTP-19330·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8983"·title="">GH-8983</a>,·<a·href="https://github.com/erlang/otp/pull/9008"·title="">PR-9008</a></p></li><li><p>Fixed·compilation·faults·when·compiling·using·<code·class="inline">--enable-vm-probes</code>.</p><p>Own·Id:·OTP-19333</p></li><li><p>Fixed·<code·class="inline">erl_nif.h</code>·on·Windows·to·compile·when·gcc·or·clang·is·used.</p><p>Own·Id:·OTP-19341·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9016"·title="">PR-9016</a></p></li><li><p>Fixed·a·minor·issue·in·the·JIT·debug·information·that·confused·tools·like·GDB·and·perf.</p><p>Own·Id:·OTP-19362·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9003"·title="">PR-9003</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">213 inet_backend·=·socket.</p><p>Own·Id:·OTP-19264</p></li><li><p><a·href="../../../lib/stdlib-6.2.2/doc/html/win32reg.html#value/2"><code·class="inline">win32reg:value/2</code></a>·will·no·longer·crash·the·emulator·when·the·value·is·an·unterminated·REG_SZ·of·size·0.</p><p>Own·Id:·OTP-19283·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8903"·title="">GH-8903</a>,·<a·href="https://github.com/erlang/otp/pull/8912"·title="">PR-8912</a></p></li><li><p><code·class="inline">Makefile</code>·dependency·generation·on·Windows·in·WSL·2·has·been·corrected.</p><p>Own·Id:·OTP-19300·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8955"·title="">PR-8955</a></p></li><li><p>Fix·lock·order·violation·if·a·NIF·monitor·<code·class="inline">down</code>·callback·calls·<code·class="inline">enif_whereis_pid</code>.·Would·cause·debug·emulator·to·crash·but·could·potentially·lead·to·deadlocks·in·optimized·emulator.</p><p>Own·Id:·OTP-19330·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8983"·title="">GH-8983</a>,·<a·href="https://github.com/erlang/otp/pull/9008"·title="">PR-9008</a></p></li><li><p>Fixed·compilation·faults·when·compiling·using·<code·class="inline">--enable-vm-probes</code>.</p><p>Own·Id:·OTP-19333</p></li><li><p>Fixed·<code·class="inline">erl_nif.h</code>·on·Windows·to·compile·when·gcc·or·clang·is·used.</p><p>Own·Id:·OTP-19341·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9016"·title="">PR-9016</a></p></li><li><p>Fixed·a·minor·issue·in·the·JIT·debug·information·that·confused·tools·like·GDB·and·perf.</p><p>Own·Id:·OTP-19362·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9003"·title="">PR-9003</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">
214 ··<a·href="#improvements-and-new-features"·class="hover-link">214 ··<a·href="#improvements-and-new-features"·class="hover-link">
215 ····<i·class="ri-link-m"·aria-hidden="true"></i>215 ····<i·class="ri-link-m"·aria-hidden="true"></i>
216 ··</a>216 ··</a>
217 ··<span·class="text">Improvements·and·New·Features</span>217 ··<span·class="text">Improvements·and·New·Features</span>
218 </h3>218 </h3>
219 <ul><li><p>Improved·documentation·of·<a·href="time_correction.html#timers">timers</a>.</p><p>Own·Id:·OTP-19360·Aux·Id:·ERIERL-1149,·<a·href="https://github.com/erlang/otp/pull/9062"·title="">PR-9062</a></p></li><li><p>The·label·for·a·process·can·now·be·retrieved·also·using·<code·class="inline">process_info(Pid,·label)</code>·in·addition·to·<a·href="../../../lib/stdlib-6.2.2/doc/html/proc_lib.html#get_label/1"><code·class="inline">proc_lib:get_label/1</code></a>.</p><p>This·new·option·is·useful·when·one·wants·to·retrieve·more·than·one·process·info·item.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">process_info</span><span·class="p"·data-group-id="8632054442-1">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8632054442-2">[</span><span·class="ss">label</span><span·class="p">,</span><span·class="ss">registered_name</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·78,·SHA:·740e1dfddbdb7fe53dd2aae90ad4c4c85796ea2d8a655555781d1a98eb8943eb·...·]-1">)</span></code></pre><p>Own·Id:·OTP-19373·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9108"·title="">PR-9108</a></p></li></ul><h2·id="erts-15-1-3"·class="section-heading">219 <ul><li><p>Improved·documentation·of·<a·href="time_correction.html#timers">timers</a>.</p><p>Own·Id:·OTP-19360·Aux·Id:·ERIERL-1149,·<a·href="https://github.com/erlang/otp/pull/9062"·title="">PR-9062</a></p></li><li><p>The·label·for·a·process·can·now·be·retrieved·also·using·<code·class="inline">process_info(Pid,·label)</code>·in·addition·to·<a·href="../../../lib/stdlib-6.2.2/doc/html/proc_lib.html#get_label/1"><code·class="inline">proc_lib:get_label/1</code></a>.</p><p>This·new·option·is·useful·when·one·wants·to·retrieve·more·than·one·process·info·item.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">process_info</span><span·class="p"·data-group-id="8564367014-1">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8564367014-2">[</span><span·class="ss">label</span><span·class="p">,</span><span·class="ss">registered_name</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·78,·SHA:·ade694803de60312dcedab2bce8c837b1508f40d0af373cf0809ef157ed0eb5a·...·]-1">)</span></code></pre><p>Own·Id:·OTP-19373·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9108"·title="">PR-9108</a></p></li></ul><h2·id="erts-15-1-3"·class="section-heading">
220 ··<a·href="#erts-15-1-3"·class="hover-link">220 ··<a·href="#erts-15-1-3"·class="hover-link">
221 ····<i·class="ri-link-m"·aria-hidden="true"></i>221 ····<i·class="ri-link-m"·aria-hidden="true"></i>
222 ··</a>222 ··</a>
223 ··<span·class="text">Erts·15.1.3</span>223 ··<span·class="text">Erts·15.1.3</span>
224 </h2>224 </h2>
225 <h3·id="fixed-bugs-and-malfunctions-7"·class="section-heading">225 <h3·id="fixed-bugs-and-malfunctions-7"·class="section-heading">
226 ··<a·href="#fixed-bugs-and-malfunctions-7"·class="hover-link">226 ··<a·href="#fixed-bugs-and-malfunctions-7"·class="hover-link">
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261 <h3·id="fixed-bugs-and-malfunctions-10"·class="section-heading">261 <h3·id="fixed-bugs-and-malfunctions-10"·class="section-heading">
262 ··<a·href="#fixed-bugs-and-malfunctions-10"·class="hover-link">262 ··<a·href="#fixed-bugs-and-malfunctions-10"·class="hover-link">
263 ····<i·class="ri-link-m"·aria-hidden="true"></i>263 ····<i·class="ri-link-m"·aria-hidden="true"></i>
264 ··</a>264 ··</a>
265 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>265 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>
266 </h3>266 </h3>
267 <ul><li><p>The·<code·class="inline">erl·-man·example</code>·has·been·corrected·to·not·consider·values·set·in·<code·class="inline">ERL_ZFLAGS</code>·and·stop·parsing·arguments·when·a·<code·class="inline">--</code>·is·encountered.</p><p>Own·Id:·OTP-19098·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8478"·title="">PR-8478</a>,·<a·href="https://github.com/erlang/otp/issues/8477"·title="">GH-8477</a></p></li><li><p>Compiler·warnings·for··Windows·I/O·back-end·have·been·silenced.</p><p>Own·Id:·OTP-19113</p></li><li><p>Bugs·related·to·<code·class="inline">return_to</code>·trace·have·been·fixed.·It·did·not·work·for·more·than·once·trace·session·and·it·did·sometimes·not·trigger·for·exceptions.</p><p>Own·Id:·OTP-19122</p></li><li><p>Potential·deadlocks·while·writing·a·crash·dump·have·been·eliminated.</p><p>Own·Id:·OTP-19133·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8521"·title="">PR-8521</a>,·<a·href="https://github.com/erlang/otp/issues/8498"·title="">GH-8498</a></p></li><li><p>When·loading·a·damaged·or·too·old·BEAM·file,·the·runtime·system·could·crash.</p><p>Own·Id:·OTP-19153·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8623"·title="">PR-8623</a></p></li><li><p>A·scheduler·thread·could·get·stuck·when·deleting·a·memory·allocator·carrier·when·adjacent·carriers·were·deleted·and/or·inserted·simultaneously·by·other·schedulers.·This·in·turn·could·cause·the·other·schedulers·to·get·stuck·as·well.</p><p>Own·Id:·OTP-19154·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8613"·title="">GH-8613</a>,·<a·href="https://github.com/erlang/otp/pull/8627"·title="">PR-8627</a></p></li><li><p>Statistics·for·number·of·carriers·in·a·shared·pool·after·calling·<code·class="inline">instrument:allocations</code>·or·<code·class="inline">instrument:carriers</code>·are·now·correct.·Also,·a·potential·bug·in·carrier·block·scanning·was·eliminated.</p><p>Own·Id:·OTP-19166·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8636"·title="">PR-8636</a></p></li><li><p>A·race·in·the·kTLS·flavour·of·SSL·distribution·has·been·fixed·so·that·<code·class="inline">inet_drv.c</code>·doesn't·read·ahead·too·much·data,·which·could·cause·the·kTLS·encryption·to·be·activated·too·late·when·some·encrypted·data·had·already·been·read·into·the·<code·class="inline">inet_drv.c</code>·buffer·as·unencrypted.</p><p>Own·Id:·OTP-19175·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8561"·title="">GH-8561</a>,·<a·href="https://github.com/erlang/otp/pull/8690"·title="">PR-8690</a></p></li><li><p>Fixed·an·emulator·crash·relating·to·compressed·ETS·tables.</p><p>Own·Id:·OTP-19176·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8683"·title="">PR-8683</a></p></li><li><p>A·function·(encode_sockaddr)·was·called·with·superfluous·argument,·on·Windows,·in·the·net·nif.</p><p>Own·Id:·OTP-19181</p></li><li><p>Fixed·a·crash·that·could·happen·on·reallocation·failure.</p><p>Own·Id:·OTP-19192</p></li><li><p>Man·pages·are·now·available·for·<code·class="inline">erl</code>,·<code·class="inline">erlc</code>,·<code·class="inline">dialyzer</code>,·and·all·other·programs·that·are·included·in·Erlang/OTP.</p><p>Own·Id:·OTP-19201·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8740"·title="">PR-8740</a></p></li><li><p>A·previous·correction·in·the·Erlang/OTP·27.0.1·emergency·patch·had·the·unfortunate·side·effect·of·sometimes·causing·an·unnecessary·fullsweep·(major)·garbage·collection·instead·of·a··generation·(minor)·garbage·collection.·This·has·been·corrected.</p><p>Own·Id:·OTP-19209·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8751"·title="">PR-8751</a>,·<a·href="https://github.com/erlang/otp/pull/8539"·title="">PR-8539</a></p></li><li><p>Fixed·trace·matchspec·functions·<code·class="inline">trace</code>·and·<code·class="inline">enable_trace</code>·to·use·the·session·tracer·when·enabling·trace·flags·on·untraced·processes.</p><p>Own·Id:·OTP-19211·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8657"·title="">GH-8657</a></p></li><li><p>Fixed·a·typo·in·the·type·spec·for·<a·href="erlang.html#t:garbage_collection_defaults/0"><code·class="inline">erlang:garbage_collection_defaults/0</code></a>.</p><p>Own·Id:·OTP-19215·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8757"·title="">PR-8757</a></p></li><li><p>Corrected·socket:ioctl·for·genaddr·(SIOCGENADDR).</p><p>Own·Id:·OTP-19216</p></li><li><p>The·support·for·Transparent·Huge·Pages·has·been·disabled·on·non-amd64·Linux·systems.</p><p>Own·Id:·OTP-19219·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8702"·title="">PR-8702</a></p></li><li><p>Fixed·a·race·condition·on·Windows·when·upgrading·from·<code·class="inline">-noshell</code>·to·a·shell·that·would·cause·Erlang·to·crash·with·the·error:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6674219233-1">{</span><span·class="ss">&#39;GetOverlappedResult&#39;</span><span·class="p">,</span><span·class="w">267 <ul><li><p>The·<code·class="inline">erl·-man·example</code>·has·been·corrected·to·not·consider·values·set·in·<code·class="inline">ERL_ZFLAGS</code>·and·stop·parsing·arguments·when·a·<code·class="inline">--</code>·is·encountered.</p><p>Own·Id:·OTP-19098·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8478"·title="">PR-8478</a>,·<a·href="https://github.com/erlang/otp/issues/8477"·title="">GH-8477</a></p></li><li><p>Compiler·warnings·for··Windows·I/O·back-end·have·been·silenced.</p><p>Own·Id:·OTP-19113</p></li><li><p>Bugs·related·to·<code·class="inline">return_to</code>·trace·have·been·fixed.·It·did·not·work·for·more·than·once·trace·session·and·it·did·sometimes·not·trigger·for·exceptions.</p><p>Own·Id:·OTP-19122</p></li><li><p>Potential·deadlocks·while·writing·a·crash·dump·have·been·eliminated.</p><p>Own·Id:·OTP-19133·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8521"·title="">PR-8521</a>,·<a·href="https://github.com/erlang/otp/issues/8498"·title="">GH-8498</a></p></li><li><p>When·loading·a·damaged·or·too·old·BEAM·file,·the·runtime·system·could·crash.</p><p>Own·Id:·OTP-19153·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8623"·title="">PR-8623</a></p></li><li><p>A·scheduler·thread·could·get·stuck·when·deleting·a·memory·allocator·carrier·when·adjacent·carriers·were·deleted·and/or·inserted·simultaneously·by·other·schedulers.·This·in·turn·could·cause·the·other·schedulers·to·get·stuck·as·well.</p><p>Own·Id:·OTP-19154·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8613"·title="">GH-8613</a>,·<a·href="https://github.com/erlang/otp/pull/8627"·title="">PR-8627</a></p></li><li><p>Statistics·for·number·of·carriers·in·a·shared·pool·after·calling·<code·class="inline">instrument:allocations</code>·or·<code·class="inline">instrument:carriers</code>·are·now·correct.·Also,·a·potential·bug·in·carrier·block·scanning·was·eliminated.</p><p>Own·Id:·OTP-19166·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8636"·title="">PR-8636</a></p></li><li><p>A·race·in·the·kTLS·flavour·of·SSL·distribution·has·been·fixed·so·that·<code·class="inline">inet_drv.c</code>·doesn't·read·ahead·too·much·data,·which·could·cause·the·kTLS·encryption·to·be·activated·too·late·when·some·encrypted·data·had·already·been·read·into·the·<code·class="inline">inet_drv.c</code>·buffer·as·unencrypted.</p><p>Own·Id:·OTP-19175·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8561"·title="">GH-8561</a>,·<a·href="https://github.com/erlang/otp/pull/8690"·title="">PR-8690</a></p></li><li><p>Fixed·an·emulator·crash·relating·to·compressed·ETS·tables.</p><p>Own·Id:·OTP-19176·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8683"·title="">PR-8683</a></p></li><li><p>A·function·(encode_sockaddr)·was·called·with·superfluous·argument,·on·Windows,·in·the·net·nif.</p><p>Own·Id:·OTP-19181</p></li><li><p>Fixed·a·crash·that·could·happen·on·reallocation·failure.</p><p>Own·Id:·OTP-19192</p></li><li><p>Man·pages·are·now·available·for·<code·class="inline">erl</code>,·<code·class="inline">erlc</code>,·<code·class="inline">dialyzer</code>,·and·all·other·programs·that·are·included·in·Erlang/OTP.</p><p>Own·Id:·OTP-19201·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8740"·title="">PR-8740</a></p></li><li><p>A·previous·correction·in·the·Erlang/OTP·27.0.1·emergency·patch·had·the·unfortunate·side·effect·of·sometimes·causing·an·unnecessary·fullsweep·(major)·garbage·collection·instead·of·a··generation·(minor)·garbage·collection.·This·has·been·corrected.</p><p>Own·Id:·OTP-19209·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8751"·title="">PR-8751</a>,·<a·href="https://github.com/erlang/otp/pull/8539"·title="">PR-8539</a></p></li><li><p>Fixed·trace·matchspec·functions·<code·class="inline">trace</code>·and·<code·class="inline">enable_trace</code>·to·use·the·session·tracer·when·enabling·trace·flags·on·untraced·processes.</p><p>Own·Id:·OTP-19211·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8657"·title="">GH-8657</a></p></li><li><p>Fixed·a·typo·in·the·type·spec·for·<a·href="erlang.html#t:garbage_collection_defaults/0"><code·class="inline">erlang:garbage_collection_defaults/0</code></a>.</p><p>Own·Id:·OTP-19215·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8757"·title="">PR-8757</a></p></li><li><p>Corrected·socket:ioctl·for·genaddr·(SIOCGENADDR).</p><p>Own·Id:·OTP-19216</p></li><li><p>The·support·for·Transparent·Huge·Pages·has·been·disabled·on·non-amd64·Linux·systems.</p><p>Own·Id:·OTP-19219·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8702"·title="">PR-8702</a></p></li><li><p>Fixed·a·race·condition·on·Windows·when·upgrading·from·<code·class="inline">-noshell</code>·to·a·shell·that·would·cause·Erlang·to·crash·with·the·error:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2474942923-1">{</span><span·class="ss">&#39;GetOverlappedResult&#39;</span><span·class="p">,</span><span·class="w">
268 ··</span><span·class="ss">&#39;The·I/O·operation·has·been·aborted·because·of·either·a·thread·exit·or·an·application·request.&#39;</span><span·class="p"·data-group-id="6674219233-1">}</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-19220·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8774"·title="">PR-8774</a>,·<a·href="https://github.com/erlang/otp/issues/7621"·title="">GH-7621</a></p></li></ul><h3·id="improvements-and-new-features-1"·class="section-heading">268 ··</span><span·class="ss">&#39;The·I/O·operation·has·been·aborted·because·of·either·a·thread·exit·or·an·application·request.&#39;</span><span·class="p"·data-group-id="2474942923-1">}</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-19220·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8774"·title="">PR-8774</a>,·<a·href="https://github.com/erlang/otp/issues/7621"·title="">GH-7621</a></p></li></ul><h3·id="improvements-and-new-features-1"·class="section-heading">
269 ··<a·href="#improvements-and-new-features-1"·class="hover-link">269 ··<a·href="#improvements-and-new-features-1"·class="hover-link">
270 ····<i·class="ri-link-m"·aria-hidden="true"></i>270 ····<i·class="ri-link-m"·aria-hidden="true"></i>
271 ··</a>271 ··</a>
272 ··<span·class="text">Improvements·and·New·Features</span>272 ··<span·class="text">Improvements·and·New·Features</span>
273 </h3>273 </h3>
274 <ul><li><p>Added·functions·<code·class="inline">getservbyname</code>·and·<code·class="inline">getservbyport</code>·to·the·<code·class="inline">net</code>·module.</p><p>Own·Id:·OTP-19101·Aux·Id:·OTP-18835</p></li><li><p>Introduced·enet·|·esock·variants·of·<a·href="../../../lib/kernel-10.2.6/doc/html/inet.html"><code·class="inline">inet</code></a>·functions,·either·when·called·with·sockets,274 <ul><li><p>Added·functions·<code·class="inline">getservbyname</code>·and·<code·class="inline">getservbyport</code>·to·the·<code·class="inline">net</code>·module.</p><p>Own·Id:·OTP-19101·Aux·Id:·OTP-18835</p></li><li><p>Introduced·enet·|·esock·variants·of·<a·href="../../../lib/kernel-10.2.6/doc/html/inet.html"><code·class="inline">inet</code></a>·functions,·either·when·called·with·sockets,
275 with·explicit·inet_backend·config·or·with·the·e·inet_backend·kernel·config·option.</p><p>Own·Id:·OTP-19132·Aux·Id:·OTP-19101</p></li><li><p>Optimize·process·and·port·creation·when·such·tracing·is·not·enabled·by·any·trace·session.</p><p>Own·Id:·OTP-19167·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8655"·title="">PR-8655</a></p></li><li><p>Compiler·warnings·for·some·removed·functions·have·been·corrected·to·point·out·the·correct·replacement·functions.</p><p>Own·Id:·OTP-19186·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8709"·title="">PR-8709</a></p></li><li><p>A·boolean·option·<code·class="inline">read_ahead</code>·has·been·implemented·for·<code·class="inline">gen_tcp</code>,·default·<code·class="inline">true</code>,·to·facilitate·not·reading·past·(caching·data)·the·end·of·a·packet.··In·particular,·for·kTLS,·caching·data·could·read·in·data·that·was·supposed·to·be·decrypted·by·the·platform's·network·stack,·before·crypto·parameters·could·be·activated.</p><p>Own·Id:·OTP-19199·Aux·Id:·OTP-19175,·<a·href="https://github.com/erlang/otp/issues/8561"·title="">GH-8561</a>,·<a·href="https://github.com/erlang/otp/issues/8690"·title="">GH-8690</a>,·<a·href="https://github.com/erlang/otp/issues/8785"·title="">GH-8785</a></p></li><li><p>The·<a·href="../../../lib/stdlib-6.2.2/doc/html/zip.html"><code·class="inline">zip</code></a>·module·has·been·updated·with·support·for:</p><ul><li>zip64·archives·-·Archives·larger·than·4GB·or·with·more·than·2^32·entries.</li><li>extended·timestamps·-·Higher·resolution·and·in·UTC.</li><li>UID/GID·-·Save·and·extract·the·original·UID/GID.</li><li>Fixes·so·that·permission·mode·attributes·are·correctly·read·and·set·for·files·in·archives.</li><li><a·href="../../../lib/stdlib-6.2.2/doc/html/zip.html#list_dir/2"><code·class="inline">zip:list_dir/2</code></a>·now·also·returns·directories,·not·only·files.·(You·can·disable·this·behaviour·by·using·the·option·<code·class="inline">skip_directories</code>).</li></ul><p>Various·bugs·in·the·original·implementation·have·also·been·fixed,·such·as:</p><ul><li>Correctly·encode·and·decode·the·DOS·timestamps·for·entries·within·an·archive·(that·is·the·non-extended·timestamp).</li><li>Fix·DOS·timestamps·to·be·set·to·localtime·instead·of·UTC·(use·extended·timestamps·for·UTC·timestamps).</li><li>Use·the·unix·file·attributes·read·from·disk·when·creating·archives·instead·of·setting·everything·to·644.</li></ul><p>Own·Id:·OTP-19214·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8765"·title="">PR-8765</a></p></li></ul><h2·id="erts-15-0-1"·class="section-heading">275 with·explicit·inet_backend·config·or·with·the·e·inet_backend·kernel·config·option.</p><p>Own·Id:·OTP-19132·Aux·Id:·OTP-19101</p></li><li><p>Optimize·process·and·port·creation·when·such·tracing·is·not·enabled·by·any·trace·session.</p><p>Own·Id:·OTP-19167·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8655"·title="">PR-8655</a></p></li><li><p>Compiler·warnings·for·some·removed·functions·have·been·corrected·to·point·out·the·correct·replacement·functions.</p><p>Own·Id:·OTP-19186·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8709"·title="">PR-8709</a></p></li><li><p>A·boolean·option·<code·class="inline">read_ahead</code>·has·been·implemented·for·<code·class="inline">gen_tcp</code>,·default·<code·class="inline">true</code>,·to·facilitate·not·reading·past·(caching·data)·the·end·of·a·packet.··In·particular,·for·kTLS,·caching·data·could·read·in·data·that·was·supposed·to·be·decrypted·by·the·platform's·network·stack,·before·crypto·parameters·could·be·activated.</p><p>Own·Id:·OTP-19199·Aux·Id:·OTP-19175,·<a·href="https://github.com/erlang/otp/issues/8561"·title="">GH-8561</a>,·<a·href="https://github.com/erlang/otp/issues/8690"·title="">GH-8690</a>,·<a·href="https://github.com/erlang/otp/issues/8785"·title="">GH-8785</a></p></li><li><p>The·<a·href="../../../lib/stdlib-6.2.2/doc/html/zip.html"><code·class="inline">zip</code></a>·module·has·been·updated·with·support·for:</p><ul><li>zip64·archives·-·Archives·larger·than·4GB·or·with·more·than·2^32·entries.</li><li>extended·timestamps·-·Higher·resolution·and·in·UTC.</li><li>UID/GID·-·Save·and·extract·the·original·UID/GID.</li><li>Fixes·so·that·permission·mode·attributes·are·correctly·read·and·set·for·files·in·archives.</li><li><a·href="../../../lib/stdlib-6.2.2/doc/html/zip.html#list_dir/2"><code·class="inline">zip:list_dir/2</code></a>·now·also·returns·directories,·not·only·files.·(You·can·disable·this·behaviour·by·using·the·option·<code·class="inline">skip_directories</code>).</li></ul><p>Various·bugs·in·the·original·implementation·have·also·been·fixed,·such·as:</p><ul><li>Correctly·encode·and·decode·the·DOS·timestamps·for·entries·within·an·archive·(that·is·the·non-extended·timestamp).</li><li>Fix·DOS·timestamps·to·be·set·to·localtime·instead·of·UTC·(use·extended·timestamps·for·UTC·timestamps).</li><li>Use·the·unix·file·attributes·read·from·disk·when·creating·archives·instead·of·setting·everything·to·644.</li></ul><p>Own·Id:·OTP-19214·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8765"·title="">PR-8765</a></p></li></ul><h2·id="erts-15-0-1"·class="section-heading">
Offset 298, 25 lines modifiedOffset 298, 25 lines modified
298 </h3>298 </h3>
299 <ul><li><p>Bugs·in·how·<code·class="inline">erl·-extra</code>·interacts·with·passing·flags·via·ERL_*FLAGS·or·<code·class="inline">-args_file</code>·have·been·fixed.</p><p>Own·Id:·OTP-18766·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7639"·title="">PR-7639</a></p></li><li><p>Fixed·a·bug·that·prevented·the·emulator·from·building·on·recent·versions·of·Yocto·Linux.</p><p>Own·Id:·OTP-18918·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7952"·title="">PR-7952</a></p></li><li><p>Fixed·spectre·mitigation·configure·test·to·work·with·GCC·patches·to·always·add·<code·class="inline">-fcf-protection=full</code>.</p><p>Own·Id:·OTP-18928·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8006"·title="">PR-8006</a></p></li><li><p>A··call·to·<code·class="inline">socket:[recv|recvfrom|recvmsg]/*</code>·with·Timeout·=·0·on·Windows·could·cause·a·(case·clause)·crash·if·data·is·immediately·available.</p><p>Own·Id:·OTP-19063·Aux·Id:·OTP-18835</p></li><li><p>Fix·bug·on·Windows·where·<code·class="inline">exit_status</code>·would·not·be·sent·when·a·port·exits·after·the·stdin/stdout·handles·have·been·closed.</p><p>Own·Id:·OTP-19077·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8324"·title="">PR-8324</a></p></li></ul><h3·id="improvements-and-new-features-2"·class="section-heading">299 <ul><li><p>Bugs·in·how·<code·class="inline">erl·-extra</code>·interacts·with·passing·flags·via·ERL_*FLAGS·or·<code·class="inline">-args_file</code>·have·been·fixed.</p><p>Own·Id:·OTP-18766·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7639"·title="">PR-7639</a></p></li><li><p>Fixed·a·bug·that·prevented·the·emulator·from·building·on·recent·versions·of·Yocto·Linux.</p><p>Own·Id:·OTP-18918·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7952"·title="">PR-7952</a></p></li><li><p>Fixed·spectre·mitigation·configure·test·to·work·with·GCC·patches·to·always·add·<code·class="inline">-fcf-protection=full</code>.</p><p>Own·Id:·OTP-18928·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8006"·title="">PR-8006</a></p></li><li><p>A··call·to·<code·class="inline">socket:[recv|recvfrom|recvmsg]/*</code>·with·Timeout·=·0·on·Windows·could·cause·a·(case·clause)·crash·if·data·is·immediately·available.</p><p>Own·Id:·OTP-19063·Aux·Id:·OTP-18835</p></li><li><p>Fix·bug·on·Windows·where·<code·class="inline">exit_status</code>·would·not·be·sent·when·a·port·exits·after·the·stdin/stdout·handles·have·been·closed.</p><p>Own·Id:·OTP-19077·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8324"·title="">PR-8324</a></p></li></ul><h3·id="improvements-and-new-features-2"·class="section-heading">
300 ··<a·href="#improvements-and-new-features-2"·class="hover-link">300 ··<a·href="#improvements-and-new-features-2"·class="hover-link">
301 ····<i·class="ri-link-m"·aria-hidden="true"></i>301 ····<i·class="ri-link-m"·aria-hidden="true"></i>
302 ··</a>302 ··</a>
303 ··<span·class="text">Improvements·and·New·Features</span>303 ··<span·class="text">Improvements·and·New·Features</span>
304 </h3>304 </h3>
305 <ul><li><p>Refactored·how·the·JIT·handles·POSIX·signals·and·how·they·affect·thread·stacks,·allowing·us·to·use·the·native·stack·register·for·Erlang·stacks·on·more·platforms.</p><p>Notably,·containers·built·on·64-bit·x86·Alpine·Linux·images·will·now·perform·much·better·in·sequential·code.·As·an·example,·running·<code·class="inline">dialyzer</code>·over·the·OTP·code·base·finishes·about·15%·quicker.</p><p>Own·Id:·OTP-18568·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7174"·title="">PR-7174</a></p></li><li><p>The·<a·href="../../../lib/runtime_tools-2.1.1/doc/html/instrument.html"><code·class="inline">instrument</code></a>·module·can·now·track·allocations·on·a·per-process·or·per-port·basis.</p><p>Own·Id:·OTP-18577·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7236"·title="">PR-7236</a></p></li><li><p>The·<code·class="inline">pid</code>·field·returned·from·<a·href="erlang.html#fun_info/2"><code·class="inline">erlang:fun_info/1,2</code></a>·is·now·always·the·pid·for·the·<code·class="inline">init</code>·process·of·the·local·node,·not·the·pid·for·the·actual·process·that·created·the·fun.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18594·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7274"·title="">PR-7274</a></p></li><li><p>By·default,·escripts·will·now·be·compiled·instead·of·interpreted.·That·means·that·the·<code·class="inline">compiler</code>·application·must·be·installed.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18639·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7348"·title="">PR-7348</a></p></li><li><p>A·binary·returned·from·the·<a·href="../../../lib/kernel-10.2.6/doc/html/socket.html"><code·class="inline">socket</code></a>·receive·functions·is·no·longer·created·as·a·sub·binary·of·an·often·large·receive·buffer·binary·(socket·option·<code·class="inline">{otp,rcvbuf}</code>).··This·avoids·space·waste,·trusting·the·allocators·to·implement·reallocation·efficiently.</p><p>Own·Id:·OTP-18642·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/6152"·title="">GH-6152</a>,·<a·href="https://github.com/erlang/otp/pull/7465"·title="">PR-7465</a></p></li><li><p>The·default·process·limit·has·been·raised·to·<code·class="inline">1048576</code>·processes.</p><p>Own·Id:·OTP-18699·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7388"·title="">PR-7388</a></p></li><li><p>The·<a·href="erlang.html#system_monitor/2"><code·class="inline">erlang:system_monitor/2</code></a>·functionality·is·now·able·to·monitor·long·message·queues·in·the·system.</p><p>Own·Id:·OTP-18709·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7651"·title="">PR-7651</a></p></li><li><p>The·<code·class="inline">erl</code>·command·now·supports·the·<code·class="inline">-S</code>·flag,·which·is·similar·to·the·<code·class="inline">-run</code>·flag,·except·that·it·will·pass·all·arguments·up·to·end·of·the·command·line·to·the·called·function.·(The·<code·class="inline">-run</code>·flag·will·not·pass·arguments·beginning·with·a·hyphen.)·Another·difference·is·that·<code·class="inline">-S</code>·will·always·call·a·function·with·one·argument,·passing·an·empty·list·if·no·arguments·were·given.</p><p>Own·Id:·OTP-18744·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7470"·title="">PR-7470</a></p></li><li><p>When·implementing·an·alternative·carrier·for·the·Erlang·distribution,·a·separate·input·handler·process·may·now·be·registered,·using·<a·href="erlang.html#dist_ctrl_input_handler/2"><code·class="inline">erlang:dist_ctrl_input_handler/2</code></a>,·also·in·the·case·when·the·distribution·controller·is·a·port.</p><p>Own·Id:·OTP-18774·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7110"·title="">PR-7110</a></p></li><li><p>The·call·stack·trace·has·now·been·added·to·the·error·reported·by·<a·href="erlang.html#process_flag/2"><code·class="inline">erlang:process_flag/2</code></a>·when·<code·class="inline">max_heap_size</code>·limit·has·been·exceeded.</p><p>Own·Id:·OTP-18779·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7592"·title="">PR-7592</a></p></li><li><p><code·class="inline">-callback</code>·attributes·have·been·added·to·<a·href="erl_tracer.html"><code·class="inline">erl_tracer</code></a>.</p><p>Own·Id:·OTP-18794·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7703"·title="">PR-7703</a></p></li><li><p>For·<code·class="inline">inet_backend·=·socket</code>,·setting·the·<code·class="inline">active</code>·socket·option·alone,·to·<code·class="inline">once</code>,·<code·class="inline">true</code>·or·<code·class="inline">N</code>·has·been·optimized,·as·well·as·the·corresponding·data·delivery.</p><p>Own·Id:·OTP-18835</p></li><li><p>New·functions·<code·class="inline">socket:sendv/*</code>·for·sending·I/O·vectors·have·been·added.</p><p>Own·Id:·OTP-18845</p></li><li><p>Socket·options·that·take·string·now·also·accept·binaries.</p><p>Own·Id:·OTP-18849·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/6510"·title="">PR-6510</a></p></li><li><p>Native·coverage·support·has·been·implemented·in·the·JIT.·It·will··automatically·be·used·by·the·<a·href="../../../lib/tools-4.1.1/doc/html/cover.html"><code·class="inline">cover</code></a>·tool·to·reduce·the·execution·overhead·when·running·cover-compiled·code.</p><p>There·are·also·new·APIs·to·support·native·coverage·without·using·the·<code·class="inline">cover</code>·tool.</p><p>To·instrument·code·for·native·coverage·it·must·be·compiled·with·the·<a·href="../../../lib/compiler-8.6.1/doc/html/compile.html#line_coverage"><code·class="inline">line_coverage</code></a>·option.</p><p>To·enable·native·coverage·in·the·runtime·system,·start·it·like·so:</p><pre><code·class="text">$·erl·+JPcover·true</code></pre><p>There·are·also·the·following·new·functions·for·supporting·native·coverage:</p><ul><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#coverage_support/0"><code·class="inline">code:coverage_support/0</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage/2"><code·class="inline">code:get_coverage/2</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#reset_coverage/1"><code·class="inline">code:reset_coverage/1</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/0"><code·class="inline">code:get_coverage_mode/0</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/1"><code·class="inline">code:get_coverage_mode/1</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#set_coverage_mode/1"><code·class="inline">code:set_coverage_mode/1</code></a></li></ul><p>Own·Id:·OTP-18856·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7856"·title="">PR-7856</a></p></li><li><p>Changed·the·default·value·of·the·command·line·flag·<code·class="inline">-code_path_choice</code>·to·<code·class="inline">strict</code>.·</p><p>Note·that·for·application·systems·using·archives,·it·is·necessary·to·add·the·<code·class="inline">code_path_choice·relaxed</code>·to·the·command·line·that·invokes·<code·class="inline">erl</code>.</p><p>Own·Id:·OTP-18894·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7243"·title="">PR-7243</a></p></li><li><p>Added·module·loading·to·<code·class="inline">erl·-init_debug</code>·printouts.</p><p>Own·Id:·OTP-18929·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8004"·title="">PR-8004</a></p></li><li><p>When·the·runtime·system·halts,·it·performs·various·flush·operations·before·terminating.·By·default·there·is·no·limit·on·how·much·time·the·flush·operations·are·allowed·to·take.·A·new·<em>halt·flush·timeout</em>·functionality·has·been·introduced·which·can·be·used·for·limiting·the·amount·of·time·that·the·flushing·operations·are·allowed·to·take.·For·more·information·see·the·documentation·of·the·<a·href="erlang.html#halt_flush_timeout"><code·class="inline">flush_timeout</code></a>·option·of·the·<a·href="erlang.html#halt/2"><code·class="inline">erlang:halt/2</code></a>·BIF·and·the·documentation·of·the·<code·class="inline">erl</code>·<a·href="erl_cmd.html#+zhft"><code·class="inline">+zhft·&lt;Timeout&gt;</code></a>·command·line·flag.</p><p>Own·Id:·OTP-18938·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8035"·title="">PR-8035</a>,·<a·href="https://github.com/erlang/otp/issues/7438"·title="">GH-7438</a></p></li><li><p>Optimized·code·loading·by·moving·certain·operations·from·the·code·server·to·the·caller.</p><p>Own·Id:·OTP-18941·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7981"·title="">PR-7981</a></p></li><li><p>Updated·asmjit·to·version·a465fe71ab3d0e224b2b4bd0fac69ae68ab9239d</p><p>Own·Id:·OTP-18942</p></li><li><p>The·deprecated·functions·in·<a·href="zlib.html"><code·class="inline">zlib</code></a>·have·been·removed.·That·includes·<code·class="inline">inflateChunk/{1,2}</code>,·<code·class="inline">getBufSize/1</code>,·<code·class="inline">setBufSize/2</code>,·the·CRC32·functions,·and·the·Adler·checksum·functions.</p><p>Own·Id:·OTP-18950</p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>Safe·destructive·update·of·tuples·has·been·implemented·in·the·compiler·and·runtime·system.·This·allows·the·VM·to·update·tuples·in-place·when·it·is·safe·to·do·so,·thus·improving·performance·by·doing·less·copying·but·also·by·producing·less·garbage.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5445955656-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5445955656-2">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·111,·SHA:·dac9b52911ee09e2c59bd188e70e5f06b08a9dc86f67a0ad4ff3d0622ca30518·...·]-1">)</span><span·class="p">.</span><span·class="w">305 <ul><li><p>Refactored·how·the·JIT·handles·POSIX·signals·and·how·they·affect·thread·stacks,·allowing·us·to·use·the·native·stack·register·for·Erlang·stacks·on·more·platforms.</p><p>Notably,·containers·built·on·64-bit·x86·Alpine·Linux·images·will·now·perform·much·better·in·sequential·code.·As·an·example,·running·<code·class="inline">dialyzer</code>·over·the·OTP·code·base·finishes·about·15%·quicker.</p><p>Own·Id:·OTP-18568·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7174"·title="">PR-7174</a></p></li><li><p>The·<a·href="../../../lib/runtime_tools-2.1.1/doc/html/instrument.html"><code·class="inline">instrument</code></a>·module·can·now·track·allocations·on·a·per-process·or·per-port·basis.</p><p>Own·Id:·OTP-18577·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7236"·title="">PR-7236</a></p></li><li><p>The·<code·class="inline">pid</code>·field·returned·from·<a·href="erlang.html#fun_info/2"><code·class="inline">erlang:fun_info/1,2</code></a>·is·now·always·the·pid·for·the·<code·class="inline">init</code>·process·of·the·local·node,·not·the·pid·for·the·actual·process·that·created·the·fun.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18594·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7274"·title="">PR-7274</a></p></li><li><p>By·default,·escripts·will·now·be·compiled·instead·of·interpreted.·That·means·that·the·<code·class="inline">compiler</code>·application·must·be·installed.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18639·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7348"·title="">PR-7348</a></p></li><li><p>A·binary·returned·from·the·<a·href="../../../lib/kernel-10.2.6/doc/html/socket.html"><code·class="inline">socket</code></a>·receive·functions·is·no·longer·created·as·a·sub·binary·of·an·often·large·receive·buffer·binary·(socket·option·<code·class="inline">{otp,rcvbuf}</code>).··This·avoids·space·waste,·trusting·the·allocators·to·implement·reallocation·efficiently.</p><p>Own·Id:·OTP-18642·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/6152"·title="">GH-6152</a>,·<a·href="https://github.com/erlang/otp/pull/7465"·title="">PR-7465</a></p></li><li><p>The·default·process·limit·has·been·raised·to·<code·class="inline">1048576</code>·processes.</p><p>Own·Id:·OTP-18699·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7388"·title="">PR-7388</a></p></li><li><p>The·<a·href="erlang.html#system_monitor/2"><code·class="inline">erlang:system_monitor/2</code></a>·functionality·is·now·able·to·monitor·long·message·queues·in·the·system.</p><p>Own·Id:·OTP-18709·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7651"·title="">PR-7651</a></p></li><li><p>The·<code·class="inline">erl</code>·command·now·supports·the·<code·class="inline">-S</code>·flag,·which·is·similar·to·the·<code·class="inline">-run</code>·flag,·except·that·it·will·pass·all·arguments·up·to·end·of·the·command·line·to·the·called·function.·(The·<code·class="inline">-run</code>·flag·will·not·pass·arguments·beginning·with·a·hyphen.)·Another·difference·is·that·<code·class="inline">-S</code>·will·always·call·a·function·with·one·argument,·passing·an·empty·list·if·no·arguments·were·given.</p><p>Own·Id:·OTP-18744·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7470"·title="">PR-7470</a></p></li><li><p>When·implementing·an·alternative·carrier·for·the·Erlang·distribution,·a·separate·input·handler·process·may·now·be·registered,·using·<a·href="erlang.html#dist_ctrl_input_handler/2"><code·class="inline">erlang:dist_ctrl_input_handler/2</code></a>,·also·in·the·case·when·the·distribution·controller·is·a·port.</p><p>Own·Id:·OTP-18774·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7110"·title="">PR-7110</a></p></li><li><p>The·call·stack·trace·has·now·been·added·to·the·error·reported·by·<a·href="erlang.html#process_flag/2"><code·class="inline">erlang:process_flag/2</code></a>·when·<code·class="inline">max_heap_size</code>·limit·has·been·exceeded.</p><p>Own·Id:·OTP-18779·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7592"·title="">PR-7592</a></p></li><li><p><code·class="inline">-callback</code>·attributes·have·been·added·to·<a·href="erl_tracer.html"><code·class="inline">erl_tracer</code></a>.</p><p>Own·Id:·OTP-18794·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7703"·title="">PR-7703</a></p></li><li><p>For·<code·class="inline">inet_backend·=·socket</code>,·setting·the·<code·class="inline">active</code>·socket·option·alone,·to·<code·class="inline">once</code>,·<code·class="inline">true</code>·or·<code·class="inline">N</code>·has·been·optimized,·as·well·as·the·corresponding·data·delivery.</p><p>Own·Id:·OTP-18835</p></li><li><p>New·functions·<code·class="inline">socket:sendv/*</code>·for·sending·I/O·vectors·have·been·added.</p><p>Own·Id:·OTP-18845</p></li><li><p>Socket·options·that·take·string·now·also·accept·binaries.</p><p>Own·Id:·OTP-18849·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/6510"·title="">PR-6510</a></p></li><li><p>Native·coverage·support·has·been·implemented·in·the·JIT.·It·will··automatically·be·used·by·the·<a·href="../../../lib/tools-4.1.1/doc/html/cover.html"><code·class="inline">cover</code></a>·tool·to·reduce·the·execution·overhead·when·running·cover-compiled·code.</p><p>There·are·also·new·APIs·to·support·native·coverage·without·using·the·<code·class="inline">cover</code>·tool.</p><p>To·instrument·code·for·native·coverage·it·must·be·compiled·with·the·<a·href="../../../lib/compiler-8.6.1/doc/html/compile.html#line_coverage"><code·class="inline">line_coverage</code></a>·option.</p><p>To·enable·native·coverage·in·the·runtime·system,·start·it·like·so:</p><pre><code·class="text">$·erl·+JPcover·true</code></pre><p>There·are·also·the·following·new·functions·for·supporting·native·coverage:</p><ul><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#coverage_support/0"><code·class="inline">code:coverage_support/0</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage/2"><code·class="inline">code:get_coverage/2</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#reset_coverage/1"><code·class="inline">code:reset_coverage/1</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/0"><code·class="inline">code:get_coverage_mode/0</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/1"><code·class="inline">code:get_coverage_mode/1</code></a></li><li><a·href="../../../lib/kernel-10.2.6/doc/html/code.html#set_coverage_mode/1"><code·class="inline">code:set_coverage_mode/1</code></a></li></ul><p>Own·Id:·OTP-18856·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7856"·title="">PR-7856</a></p></li><li><p>Changed·the·default·value·of·the·command·line·flag·<code·class="inline">-code_path_choice</code>·to·<code·class="inline">strict</code>.·</p><p>Note·that·for·application·systems·using·archives,·it·is·necessary·to·add·the·<code·class="inline">code_path_choice·relaxed</code>·to·the·command·line·that·invokes·<code·class="inline">erl</code>.</p><p>Own·Id:·OTP-18894·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7243"·title="">PR-7243</a></p></li><li><p>Added·module·loading·to·<code·class="inline">erl·-init_debug</code>·printouts.</p><p>Own·Id:·OTP-18929·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8004"·title="">PR-8004</a></p></li><li><p>When·the·runtime·system·halts,·it·performs·various·flush·operations·before·terminating.·By·default·there·is·no·limit·on·how·much·time·the·flush·operations·are·allowed·to·take.·A·new·<em>halt·flush·timeout</em>·functionality·has·been·introduced·which·can·be·used·for·limiting·the·amount·of·time·that·the·flushing·operations·are·allowed·to·take.·For·more·information·see·the·documentation·of·the·<a·href="erlang.html#halt_flush_timeout"><code·class="inline">flush_timeout</code></a>·option·of·the·<a·href="erlang.html#halt/2"><code·class="inline">erlang:halt/2</code></a>·BIF·and·the·documentation·of·the·<code·class="inline">erl</code>·<a·href="erl_cmd.html#+zhft"><code·class="inline">+zhft·&lt;Timeout&gt;</code></a>·command·line·flag.</p><p>Own·Id:·OTP-18938·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8035"·title="">PR-8035</a>,·<a·href="https://github.com/erlang/otp/issues/7438"·title="">GH-7438</a></p></li><li><p>Optimized·code·loading·by·moving·certain·operations·from·the·code·server·to·the·caller.</p><p>Own·Id:·OTP-18941·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7981"·title="">PR-7981</a></p></li><li><p>Updated·asmjit·to·version·a465fe71ab3d0e224b2b4bd0fac69ae68ab9239d</p><p>Own·Id:·OTP-18942</p></li><li><p>The·deprecated·functions·in·<a·href="zlib.html"><code·class="inline">zlib</code></a>·have·been·removed.·That·includes·<code·class="inline">inflateChunk/{1,2}</code>,·<code·class="inline">getBufSize/1</code>,·<code·class="inline">setBufSize/2</code>,·the·CRC32·functions,·and·the·Adler·checksum·functions.</p><p>Own·Id:·OTP-18950</p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>Safe·destructive·update·of·tuples·has·been·implemented·in·the·compiler·and·runtime·system.·This·allows·the·VM·to·update·tuples·in-place·when·it·is·safe·to·do·so,·thus·improving·performance·by·doing·less·copying·but·also·by·producing·less·garbage.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="3931276528-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3931276528-2">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·111,·SHA:·bee419b3e0dd3400371919877747b009290d26c8863f4ee5d99039c3c8d26302·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
306 </span><span·class="nf">update</span><span·class="p"·data-group-id="5445955656-3">(</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5445955656-4">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">needs_update</span><span·class="p">,</span><span·class="ss">b</s[·...·truncated·by·diffoscope;·len:·195,·SHA:·5d32d1ee69438d89804a09c62353fdcd436d6eec93ba1fdca21a86d6fadf1ea2·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">306 </span><span·class="nf">update</span><span·class="p"·data-group-id="3931276528-3">(</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="3931276528-4">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">needs_update</span><span·class="p">,</span><span·class="ss">b</s[·...·truncated·by·diffoscope;·len:·195,·SHA:·d9b2a1d992329854da4ff410876ed460adf47e299a7e86ce28f5e435f9228c60·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
307 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R0</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5445955656-5">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">up_to_date</span><span·class="p"·data-group-id="5445955656-5">}</span><span·class="p">,</span><span·class="w">307 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R0</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="3931276528-5">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">up_to_date</span><span·class="p"·data-group-id="3931276528-5">}</span><span·class="p">,</span><span·class="w">
308 ····</span><span·class="k">if</span><span·class="w">308 ····</span><span·class="k">if</span><span·class="w">
309 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">309 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
310 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5445955656-6">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">negative</span><span·class="p"·data-group-id="5445955656-6">}</span><span·class="p">;</span><span·class="w">310 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="3931276528-6">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">negative</span><span·class="p"·data-group-id="3931276528-6">}</span><span·class="p">;</span><span·class="w">
311 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">311 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
312 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5445955656-7">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">zero</span><span·class="p"·data-group-id="5445955656-7">}</span><span·class="p">;</span><span·class="w">312 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="3931276528-7">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">zero</span><span·class="p"·data-group-id="3931276528-7">}</span><span·class="p">;</span><span·class="w">
313 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">313 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
314 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5445955656-8">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">positive</span><span·class="p"·data-group-id="5445955656-8">}</span><span·class="w">314 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="3931276528-8">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">positive</span><span·class="p"·data-group-id="3931276528-8">}</span><span·class="w">
315 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·record·updates·in·each·of·the·three·clauses·of·the·<code·class="inline">if</code>·can·safely·be·done·in-place,·because·variable·<code·class="inline">R</code>·is·not·used·again.</p><p>Own·Id:·OTP-18972·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8090"·title="">PR-8090</a></p></li><li><p>The·obsolete·and·undocumented·support·for·opening·a·port·to·an·external315 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·record·updates·in·each·of·the·three·clauses·of·the·<code·class="inline">if</code>·can·safely·be·done·in-place,·because·variable·<code·class="inline">R</code>·is·not·used·again.</p><p>Own·Id:·OTP-18972·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8090"·title="">PR-8090</a></p></li><li><p>The·obsolete·and·undocumented·support·for·opening·a·port·to·an·external
316 resource·by·passing·an·atom·(or·a·string)·as·first·argument·to316 resource·by·passing·an·atom·(or·a·string)·as·first·argument·to
317 <a·href="erlang.html#open_port/2"><code·class="inline">open_port()</code></a>,·implemented·by·the·vanilla·driver,317 <a·href="erlang.html#open_port/2"><code·class="inline">open_port()</code></a>,·implemented·by·the·vanilla·driver,
318 has·been·removed.·This·feature·has·been·scheduled·for·removal·in·OTP·27318 has·been·removed.·This·feature·has·been·scheduled·for·removal·in·OTP·27
319 since·the·release·of·OTP·26.</p><p>Own·Id:·OTP-18976·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7125"·title="">PR-7125</a></p></li><li><p>An·optional·NIF·callback·<code·class="inline">ERL_NIF_OPT_ON_UNLOAD_THREAD</code>·to·be·called·by·all·scheduler·threads·when·a·NIF·library·is·unloaded.·Used·for·releasing·thread·specific·data.·Can·be·set·with·function·<code·class="inline">enif_set_option</code>.</p><p>Own·Id:·OTP-18977·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7809"·title="">PR-7809</a></p></li><li><p>There·is·a·new·module·<a·href="../../../lib/kernel-10.2.6/doc/html/trace.html"><code·class="inline">trace</code></a>·in·Kernel·providing·the·same·trace·functionality·as·<a·href="erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·and·<a·href="erlang.html#trace_pattern/3"><code·class="inline">erlang:trace_pattern/3</code></a>,·but·with·the·addition·of·<strong>dynamic·isolated·trace·sessions</strong>.</p><p>Own·Id:·OTP-18980</p></li><li><p>Added·the·<code·class="inline">+MMlp·on|off</code>·emulator·option·to·let·the·<code·class="inline">mseg</code>·allocator·use·&quot;large·pages&quot;·(sometimes·known·as·&quot;huge·pages&quot;·or·&quot;super·pages&quot;).·This·currently·only·affects·super-carrier·allocations,·but·may·be·extended·in·the·future.</p><p>Own·Id:·OTP-18984·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7977"·title="">PR-7977</a></p></li><li><p><code·class="inline">inet_backend·=·socket</code>·has·been·optimized·and·reworked·to·be·more·compatible·with·the·original·<code·class="inline">inet_backend·=·inet</code>.</p><p>Own·Id:·OTP-19004·Aux·Id:·OTP-18835</p></li><li><p>The·<code·class="inline">socket</code>·documentation·has·been·reworked,·and·due·to319 since·the·release·of·OTP·26.</p><p>Own·Id:·OTP-18976·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7125"·title="">PR-7125</a></p></li><li><p>An·optional·NIF·callback·<code·class="inline">ERL_NIF_OPT_ON_UNLOAD_THREAD</code>·to·be·called·by·all·scheduler·threads·when·a·NIF·library·is·unloaded.·Used·for·releasing·thread·specific·data.·Can·be·set·with·function·<code·class="inline">enif_set_option</code>.</p><p>Own·Id:·OTP-18977·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7809"·title="">PR-7809</a></p></li><li><p>There·is·a·new·module·<a·href="../../../lib/kernel-10.2.6/doc/html/trace.html"><code·class="inline">trace</code></a>·in·Kernel·providing·the·same·trace·functionality·as·<a·href="erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·and·<a·href="erlang.html#trace_pattern/3"><code·class="inline">erlang:trace_pattern/3</code></a>,·but·with·the·addition·of·<strong>dynamic·isolated·trace·sessions</strong>.</p><p>Own·Id:·OTP-18980</p></li><li><p>Added·the·<code·class="inline">+MMlp·on|off</code>·emulator·option·to·let·the·<code·class="inline">mseg</code>·allocator·use·&quot;large·pages&quot;·(sometimes·known·as·&quot;huge·pages&quot;·or·&quot;super·pages&quot;).·This·currently·only·affects·super-carrier·allocations,·but·may·be·extended·in·the·future.</p><p>Own·Id:·OTP-18984·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7977"·title="">PR-7977</a></p></li><li><p><code·class="inline">inet_backend·=·socket</code>·has·been·optimized·and·reworked·to·be·more·compatible·with·the·original·<code·class="inline">inet_backend·=·inet</code>.</p><p>Own·Id:·OTP-19004·Aux·Id:·OTP-18835</p></li><li><p>The·<code·class="inline">socket</code>·documentation·has·been·reworked,·and·due·to
320 that·a·few·details·were·fixed:</p><ul><li><a·href="../../../lib/kernel-10.2.6/doc/html/socket.html#is_supported/1"><code·class="inline">socket:is_supported/1</code></a>·now·returns·<code·class="inline">true</code>·for·example·for·<code·class="inline">protocols</code>320 that·a·few·details·were·fixed:</p><ul><li><a·href="../../../lib/kernel-10.2.6/doc/html/socket.html#is_supported/1"><code·class="inline">socket:is_supported/1</code></a>·now·returns·<code·class="inline">true</code>·for·example·for·<code·class="inline">protocols</code>
321 that·is·a·&quot;category&quot;,·not·an·item.</li><li><a·href="../../../lib/kernel-10.2.6/doc/html/socket.html#cancel_monitor/1"><code·class="inline">socket:cancel_monitor/1</code></a>·no·longer·badargs·for·a·monitor·that·was·set·by321 that·is·a·&quot;category&quot;,·not·an·item.</li><li><a·href="../../../lib/kernel-10.2.6/doc/html/socket.html#cancel_monitor/1"><code·class="inline">socket:cancel_monitor/1</code></a>·no·longer·badargs·for·a·monitor·that·was·set·by
Offset 3254, 17 lines modifiedOffset 3254, 17 lines modified
3254 markedly·so·when·the·maximum·number·of·file·descriptors·has·been·tuned·to·a3254 markedly·so·when·the·maximum·number·of·file·descriptors·has·been·tuned·to·a
3255 large·number.</p><p>Instead,·in·erl_child_setup,·walk·the·open·descriptors·under·<code·class="inline">/dev/fd</code>·and3255 large·number.</p><p>Instead,·in·erl_child_setup,·walk·the·open·descriptors·under·<code·class="inline">/dev/fd</code>·and
3256 close·only·those·which·are·open.</p><p>This·optimization·affects·the·CPU·usage·of·starting·a·new·Erlang·instance.</p><p>Own·Id:·OTP-16270</p></li><li><p>Optimized·<a·href="../../../lib/stdlib-6.2.2/doc/html/maps.html#merge/2"><code·class="inline">maps:merge/2</code></a>·for·trivial·cases·of·an·empty·map(s)·or·same·map.</p><p>Own·Id:·OTP-16283·Aux·Id:·PR-2441</p></li><li><p>The·new·experimental·<code·class="inline">socket</code>·module·has·been·moved·to·the·Kernel·application.</p><p>Own·Id:·OTP-16312</p></li><li><p>Improved·the·presentation·of·allocations·and·carriers·in·the·<code·class="inline">instrument</code>3256 close·only·those·which·are·open.</p><p>This·optimization·affects·the·CPU·usage·of·starting·a·new·Erlang·instance.</p><p>Own·Id:·OTP-16270</p></li><li><p>Optimized·<a·href="../../../lib/stdlib-6.2.2/doc/html/maps.html#merge/2"><code·class="inline">maps:merge/2</code></a>·for·trivial·cases·of·an·empty·map(s)·or·same·map.</p><p>Own·Id:·OTP-16283·Aux·Id:·PR-2441</p></li><li><p>The·new·experimental·<code·class="inline">socket</code>·module·has·been·moved·to·the·Kernel·application.</p><p>Own·Id:·OTP-16312</p></li><li><p>Improved·the·presentation·of·allocations·and·carriers·in·the·<code·class="inline">instrument</code>
3257 module.</p><p>Own·Id:·OTP-16327</p></li><li><p>As·announced·in·OTP·22.0,·the·previously·existing·limited·support·for·VxWorks3257 module.</p><p>Own·Id:·OTP-16327</p></li><li><p>As·announced·in·OTP·22.0,·the·previously·existing·limited·support·for·VxWorks
3258 has·now·been·removed.</p><p>*<strong>·POTENTIAL·INCOMPATIBILITY·*</strong></p><p>Own·Id:·OTP-16329·Aux·Id:·OTP-15621</p></li><li><p>The·return·value·when·using·the·<code·class="inline">httph</code>·and·<code·class="inline">httph_bin</code>·option·to3258 has·now·been·removed.</p><p>*<strong>·POTENTIAL·INCOMPATIBILITY·*</strong></p><p>Own·Id:·OTP-16329·Aux·Id:·OTP-15621</p></li><li><p>The·return·value·when·using·the·<code·class="inline">httph</code>·and·<code·class="inline">httph_bin</code>·option·to
3259 <a·href="erlang.html#decode_packet/3"><code·class="inline">erlang:decode_packet/3</code></a>·and·<a·href="../../../lib/kernel-10.2.6/doc/html/inet.html#setopts/2"><code·class="inline">inet:setopts/2</code></a>·has·been·changed·to·also·include3259 <a·href="erlang.html#decode_packet/3"><code·class="inline">erlang:decode_packet/3</code></a>·and·<a·href="../../../lib/kernel-10.2.6/doc/html/inet.html#setopts/2"><code·class="inline">inet:setopts/2</code></a>·has·been·changed·to·also·include
3260 the·original·header·unmodified.·See·<a·href="erlang.html#decode_packet/3"><code·class="inline">erlang:decode_packet/3</code></a>.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">3260 the·original·header·unmodified.·See·<a·href="erlang.html#decode_packet/3"><code·class="inline">erlang:decode_packet/3</code></a>.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">
3261 ······</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">decode_packet</span><span·class="p"·data-group-id="1006441152-1">(</span><span·class="ss">httph_bin</span><span·class="p">,</span><span·class="p"·data-group-id="1006441152-2">&lt;&lt;</span><span·class="s">&quot;HELLO:3261 ······</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">decode_packet</span><span·class="p"·data-group-id="7864878648-1">(</span><span·class="ss">httph_bin</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-2">&lt;&lt;</span><span·class="s">&quot;HELLO:
3262 ······hi\r\n\r\n&quot;</span><span·class="p"·data-group-id="1006441152-2">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="1006441152-3">[</span><span·class="p"·data-group-id="1006441152-3">]</span><span·class="p"·data-group-id="1006441152-1">)</span><span·class="p">.</span><span·class="w"> 
3263 ······</span><span·class="p"·data-group-id="1006441152-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1006441152-5">{</span><span·class="ss">http_header</span><span·class="p">,</span><span·class="mi">0</span><span·cla[·...·truncated·by·diffoscope;·len:·1101,·SHA:·c644e29d3699b2b12efdcf63d253d6bfb4162df6d5662afaf1aa7a6e2f165a43·...·]3262 ······hi\r\n\r\n&quot;</span><span·class="p"·data-group-id="7864878648-2">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-3">[</span><span·class="p"·data-group-id="7864878648-3">]</span><span·class="p"·data-group-id="7864878648-1[·...·truncated·by·diffoscope;·len:·50,·SHA:·7c76ffcbdd2b9b0809992215d4bc03869c03819d4f2872424fd7856db727c221·...·]
 3263 ······</span><span·class="p"·data-group-id="7864878648-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-5">{</span><span·class="ss">http_header</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-6">&lt;&lt;</span><span·class="s">&quot;Hello&quot;</span><span·class="p"·data-group-id="7864878648-6">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-7">&lt;&lt;</span><span·class="s">&quot;HELLO&quot;</span><span·class="p"·data-group-id="7864878648-7">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-8">&lt;&lt;</span><span·class="s">&quot;hi&quot;</span><span·class="p"·data-group-id="7864878648-8">&gt;&gt;</span><span·class="p"·data-group-id="7864878648-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="7864878648-9">&lt;&lt;</span><span·class="s">&quot;\r\n&quot;</span><span·class="p"·data-group-id="7864878648-9">&gt;&gt;</span><span·class="p"·data-group-id="7864878648-4">}</span></code></pre><p>Own·Id:·OTP-16347·Aux·Id:·PR-2466</p></li><li><p>Ensure·<a·href="../../../lib/kernel-10.2.6/doc/html/net_kernel.html#monitor_nodes/1"><code·class="inline">net_kernel:monitor_nodes/1</code></a>·sends·<code·class="inline">nodedown</code>·messages·of·a·failed
3264 connection·before·<code·class="inline">nodeup</code>·messages·of·a·reestablished·connection·toward·the3264 connection·before·<code·class="inline">nodeup</code>·messages·of·a·reestablished·connection·toward·the
3265 same·node.</p><p>Own·Id:·OTP-16362</p></li><li><p>Update·of·<a·href="../../../lib/kernel-10.2.6/doc/html/seq_trace.html#whatis">sequential·tracing</a>·to·also·support·other3265 same·node.</p><p>Own·Id:·OTP-16362</p></li><li><p>Update·of·<a·href="../../../lib/kernel-10.2.6/doc/html/seq_trace.html#whatis">sequential·tracing</a>·to·also·support·other
3266 information·transfers·than·message·passing.</p><p>Own·Id:·OTP-16370·Aux·Id:·OTP-15251,·OTP-15232</p></li><li><p>socket:·It·is·now·possible·to·create·a·socket·from·an·already·existing·file3266 information·transfers·than·message·passing.</p><p>Own·Id:·OTP-16370·Aux·Id:·OTP-15251,·OTP-15232</p></li><li><p>socket:·It·is·now·possible·to·create·a·socket·from·an·already·existing·file
3267 descriptor.</p><p>Own·Id:·OTP-16398·Aux·Id:·ERL-1154</p></li><li><p>socket:·The·socket:supports/1·function·now·also·report·if·netns·is·supported3267 descriptor.</p><p>Own·Id:·OTP-16398·Aux·Id:·ERL-1154</p></li><li><p>socket:·The·socket:supports/1·function·now·also·report·if·netns·is·supported
3268 or·not.</p><p>Own·Id:·OTP-16432</p></li><li><p><code·class="inline">=:=</code>·has·been·optimized·to·return·<code·class="inline">false</code>·immediately·when·comparing·two·maps3268 or·not.</p><p>Own·Id:·OTP-16432</p></li><li><p><code·class="inline">=:=</code>·has·been·optimized·to·return·<code·class="inline">false</code>·immediately·when·comparing·two·maps
3269 of·different·sizes.</p><p>Own·Id:·OTP-16454</p></li><li><p>Changed·the·behaviour·of·passing·the·<code·class="inline">erl</code>·command·line·argument3269 of·different·sizes.</p><p>Own·Id:·OTP-16454</p></li><li><p>Changed·the·behaviour·of·passing·the·<code·class="inline">erl</code>·command·line·argument
3270 <a·href="erl_cmd.html#async_thread_pool_size"><code·class="inline">+A·0</code></a>·to·silently·imply·<code·class="inline">+A·1</code>.·That·is,3270 <a·href="erl_cmd.html#async_thread_pool_size"><code·class="inline">+A·0</code></a>·to·silently·imply·<code·class="inline">+A·1</code>.·That·is,
Offset 10971, 20 lines modifiedOffset 10971, 20 lines modified
10971 <ul><li><p>Previously·<a·href="erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·behaved10971 <ul><li><p>Previously·<a·href="erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·behaved
10972 completely·asynchronous.·This·had·one·undesirable·effect,·though.·You·could10972 completely·asynchronous.·This·had·one·undesirable·effect,·though.·You·could
10973 never·know·when·you·were·guaranteed·<em>not</em>·to·be·affected·by·a·link·that·you10973 never·know·when·you·were·guaranteed·<em>not</em>·to·be·affected·by·a·link·that·you
10974 had·unlinked·or·a·monitor·that·you·had·demonitored.</p><p>The·new·behavior·of·<a·href="erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·can·be10974 had·unlinked·or·a·monitor·that·you·had·demonitored.</p><p>The·new·behavior·of·<a·href="erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·can·be
10975 viewed·as·two·operations·performed·atomically.·Asynchronously·send·an·unlink10975 viewed·as·two·operations·performed·atomically.·Asynchronously·send·an·unlink
10976 signal·or·a·demonitor·signal,·and·ignore·any·future·results·of·the·link·or10976 signal·or·a·demonitor·signal,·and·ignore·any·future·results·of·the·link·or
10977 monitor.</p><p><em>NOTE</em>:·This·change·can·cause·some·obscure·code·to·fail·which·previously·did10977 monitor.</p><p><em>NOTE</em>:·This·change·can·cause·some·obscure·code·to·fail·which·previously·did
10978 not.·For·example,·the·following·code·might·hang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">············</span><span·class="n">Mon</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monitor</span><span·class="p"·data-group-id="3364227019-1">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="3364227019-1">)</span><span·class="p">,</span><span·class="w">10978 not.·For·example,·the·following·code·might·hang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">············</span><span·class="n">Mon</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monitor</span><span·class="p"·data-group-id="3603193906-1">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="3603193906-1">)</span><span·class="p">,</span><span·class="w">
10979 ············</span><span·class="c1">%%·...</span><span·class="w">10979 ············</span><span·class="c1">%%·...</span><span·class="w">
10980 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="3364227019-2">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bang</span><span·class="p"·data-group-id="3364227019-2">)</span><span·class="p">,</span><span·class="w">10980 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="3603193906-2">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bang</span><span·class="p"·data-group-id="3603193906-2">)</span><span·class="p">,</span><span·class="w">
10981 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="3364227019-3">(</span><span·class="n">Mon</span><span·class="p"·data-group-id="3364227019-3">)</span><span·class="p">,</span><span·class="w">10981 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="3603193906-3">(</span><span·class="n">Mon</span><span·class="p"·data-group-id="3603193906-3">)</span><span·class="p">,</span><span·class="w">
10982 ············</span><span·class="k">receive</span><span·class="w">10982 ············</span><span·class="k">receive</span><span·class="w">
10983 ················</span><span·class="p"·data-group-id="3364227019-4">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mon</span><span·class="w">·</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·167,·SHA:·b777c48847510a5485ac13cb47fbc8e0a486607f8108a861c2595797c4c0a6cc·...·]-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">10983 ················</span><span·class="p"·data-group-id="3603193906-4">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mon</span><span·class="w">·</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·167,·SHA:·370dd41c44e09d655e6f9c0ff4e169ecf4ee622b693e13fa371ebd49661a9ddb·...·]-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">
10984 ············</span><span·class="c1">%%·We·were·previously·guaranteed·to·get·a·down·message</span><span·class="w">10984 ············</span><span·class="c1">%%·We·were·previously·guaranteed·to·get·a·down·message</span><span·class="w">
10985 ············</span><span·class="c1">%%·(since·we·exited·the·process·ourself),·so·we·could</span><span·class="w">10985 ············</span><span·class="c1">%%·(since·we·exited·the·process·ourself),·so·we·could</span><span·class="w">
10986 ············</span><span·class="c1">%%·in·this·case·leave·out:</span><span·class="w">10986 ············</span><span·class="c1">%%·in·this·case·leave·out:</span><span·class="w">
10987 ············</span><span·class="c1">%%·after·0·-&gt;·ok</span><span·class="w">10987 ············</span><span·class="c1">%%·after·0·-&gt;·ok</span><span·class="w">
10988 ············</span><span·class="k">end</span><span·class="p">,</span></code></pre><p>*<strong>·POTENTIAL·INCOMPATIBILITY·*</strong></p><p>Own·Id:·OTP-5772</p></li><li><p>Two·bugs·fixed:·If·the·environment·variable·<code·class="inline">ERL_FLAGS</code>·was·set,·its·contents10988 ············</span><span·class="k">end</span><span·class="p">,</span></code></pre><p>*<strong>·POTENTIAL·INCOMPATIBILITY·*</strong></p><p>Own·Id:·OTP-5772</p></li><li><p>Two·bugs·fixed:·If·the·environment·variable·<code·class="inline">ERL_FLAGS</code>·was·set,·its·contents
10989 would·be·appended·to·the·end·of·the·command·line·even·if·the·command·line·had10989 would·be·appended·to·the·end·of·the·command·line·even·if·the·command·line·had
10990 an·<code·class="inline">-extra</code>·options.·Changed·to·place·the·options·from·<code·class="inline">ERL_FLAGS</code>·just·before10990 an·<code·class="inline">-extra</code>·options.·Changed·to·place·the·options·from·<code·class="inline">ERL_FLAGS</code>·just·before
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11534 ······</p>11534 ······</p>
11535 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>11535 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
11536 ····</footer>11536 ····</footer>
11537 ··</div>11537 ··</div>
11538 </main>11538 </main>
11539 </div>11539 </div>
11540 <script>11540 <script>
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196 ····<i·class="ri-link-m"·aria-hidden="true"></i>196 ····<i·class="ri-link-m"·aria-hidden="true"></i>
197 ··</a>197 ··</a>
198 ··<span·class="text">Example</span>198 ··<span·class="text">Example</span>
199 </h2>199 </h2>
200 <p>The·following·example·shows·how·lock·contention·for·ETS·tables·can·be·minimized200 <p>The·following·example·shows·how·lock·contention·for·ETS·tables·can·be·minimized
201 by·having·one·ETS·table·for·each·scheduler.·The·table·identifiers·for·the·ETS201 by·having·one·ETS·table·for·each·scheduler.·The·table·identifiers·for·the·ETS
202 tables·are·stored·as·a·single·persistent·term:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="c1">%%·There·is·one·ETS·table·for·each·scheduler.</span><span·class="w">202 tables·are·stored·as·a·single·persistent·term:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="c1">%%·There·is·one·ETS·table·for·each·scheduler.</span><span·class="w">
203 ····</span><span·class="n">Sid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="4801993281-1">(</span><span·class="ss">scheduler_id</span><span·class="p"·data-group-id="4801993281-1">)</span><span·class="p">,</span><span·class="w">203 ····</span><span·class="n">Sid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="6060460395-1">(</span><span·class="ss">scheduler_id</span><span·class="p"·data-group-id="6060460395-1">)</span><span·class="p">,</span><span·class="w">
204 ····</span><span·class="n">Tid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="4801993281-2">(</span><span·class="n">Sid</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">persistent_term</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="4801993281-3">(</span><span·class="o">?[·...·truncated·by·diffoscope;·len:·130,·SHA:·2648cd6eca10f51965d5ea889a791bf267dd1a1f07d7485f996bbef5c54e1b1c·...·]-2">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="n">Tid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="6060460395-2">(</span><span·class="n">Sid</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">persistent_term</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="6060460395-3">(</span><span·class="o">?[·...·truncated·by·diffoscope;·len:·130,·SHA:·f39577dc6deadbba674b53c3ffc9b9d82da9d6b4b8efa97c432e1f63ab3177a0·...·]-2">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">update_counter</span><span·class="p"·data-group-id="4801993281-4">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4801993281-4">)</span><span·class="p">.</span></code></pre>205 ····</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">update_counter</span><span·class="p"·data-group-id="6060460395-4">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="6060460395-4">)</span><span·class="p">.</span></code></pre>
206 ····</section>206 ····</section>
  
207 </div>207 </div>
  
208 ··<section·id="summary"·class="details-list">208 ··<section·id="summary"·class="details-list">
209 ····<h1·class="section-heading">209 ····<h1·class="section-heading">
210 ······<a·class="hover-link"·href="#summary">210 ······<a·class="hover-link"·href="#summary">
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597 ······</p>597 ······</p>
598 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>598 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
599 ····</footer>599 ····</footer>
600 ··</div>600 ··</div>
601 </main>601 </main>
602 </div>602 </div>
603 <script>603 <script>
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404 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>404 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
405 ····</footer>405 ····</footer>
406 ··</div>406 ··</div>
407 </main>407 </main>
408 </div>408 </div>
409 <script>409 <script>
410 ··function·mermaidLoaded()·{410 ··function·mermaidLoaded()·{
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324 ······</p>324 ······</p>
325 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>325 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
326 ····</footer>326 ····</footer>
327 ··</div>327 ··</div>
328 </main>328 </main>
329 </div>329 </div>
330 <script>330 <script>
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460 ······</p>460 ······</p>
461 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>461 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
462 ····</footer>462 ····</footer>
463 ··</div>463 ··</div>
464 </main>464 </main>
465 </div>465 </div>
466 <script>466 <script>
467 ··function·mermaidLoaded()·{467 ··function·mermaidLoaded()·{
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251 ······</p>251 ······</p>
252 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>252 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
253 ····</footer>253 ····</footer>
254 ··</div>254 ··</div>
255 </main>255 </main>
256 </div>256 </div>
257 <script>257 <script>
258 ··function·mermaidLoaded()·{258 ··function·mermaidLoaded()·{
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140 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>140 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
141 ······</p>141 ······</p>
142 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>142 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
143 ····</footer>143 ····</footer>
144 ··</div>144 ··</div>
145 </main>145 </main>
146 </div>146 </div>
147 <script>147 <script>
148 ··function·mermaidLoaded()·{148 ··function·mermaidLoaded()·{
149 ····mermaid.initialize({149 ····mermaid.initialize({
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187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>187 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
188 ······</p>188 ······</p>
189 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>189 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
190 ····</footer>190 ····</footer>
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192 </main>192 </main>
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194 <script>194 <script>
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233 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>233 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
234 ······</p>234 ······</p>
235 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>235 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
236 ····</footer>236 ····</footer>
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238 </main>238 </main>
239 </div>239 </div>
240 <script>240 <script>
241 ··function·mermaidLoaded()·{241 ··function·mermaidLoaded()·{
242 ····mermaid.initialize({242 ····mermaid.initialize({
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225 (alloc_util·and·the·different·strategies).·However,·that·would·not·be225 (alloc_util·and·the·different·strategies).·However,·that·would·not·be
226 as·straight·forward·as·one·can·think·and·can·also·waste·quite·a·lot·of226 as·straight·forward·as·one·can·think·and·can·also·waste·quite·a·lot·of
227 memory·as·it·uses·prepended·block·headers.·The·granularity·of·the227 memory·as·it·uses·prepended·block·headers.·The·granularity·of·the
228 super·carrier·is·one·memory·page·(usually·4kb).·We·want·to·allocate228 super·carrier·is·one·memory·page·(usually·4kb).·We·want·to·allocate
229 and·free·entire·pages·and·we·don't·want·to·waste·an·entire·page·just229 and·free·entire·pages·and·we·don't·want·to·waste·an·entire·page·just
230 to·hold·the·block·header·of·the·following·pages.</p><p>Instead·we·store·the·meta·information·about·all·the·free·segments·in·a230 to·hold·the·block·header·of·the·following·pages.</p><p>Instead·we·store·the·meta·information·about·all·the·free·segments·in·a
231 dedicated·area·apart·from·the·<code·class="inline">sa</code>·and·<code·class="inline">sua</code>·areas.·Every·free·segment·is231 dedicated·area·apart·from·the·<code·class="inline">sa</code>·and·<code·class="inline">sua</code>·areas.·Every·free·segment·is
232 represented·by·a·descriptor·struct·(<code·class="inline">ErtsFreeSegDesc</code>).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">typedef</span><span·class="w">·</span><span·class="ss">struct</span><span·class="w">·</span><span·class="p"·data-group-id="1162066711-1">{</span><span·class="w">232 represented·by·a·descriptor·struct·(<code·class="inline">ErtsFreeSegDesc</code>).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">typedef</span><span·class="w">·</span><span·class="ss">struct</span><span·class="w">·</span><span·class="p"·data-group-id="0059687626-1">{</span><span·class="w">
233 ····</span><span·class="n">RBTNode</span><span·class="w">·</span><span·class="ss">snode</span><span·class="p">;</span><span·class="w">······</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="nb">node</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">&#39;stree&#39;</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">233 ····</span><span·class="n">RBTNode</span><span·class="w">·</span><span·class="ss">snode</span><span·class="p">;</span><span·class="w">······</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="nb">node</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">&#39;stree&#39;</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
234 ····</span><span·class="n">RBTNode</span><span·class="w">·</span><span·class="ss">anode</span><span·class="p">;</span><span·class="w">······</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="nb">node</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">&#39;atree&#39;</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">234 ····</span><span·class="n">RBTNode</span><span·class="w">·</span><span·class="ss">anode</span><span·class="p">;</span><span·class="w">······</span><span·class="o">/</span><span·class="o">*</span><span·class="w">·</span><span·class="nb">node</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">&#39;atree&#39;</span><span·class="w">·</span><span·class="o">*</span><span·class="o">/</span><span·class="w">
235 ····</span><span·class="ss">char</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">start</span><span·class="p">;</span><span·class="w">235 ····</span><span·class="ss">char</span><span·class="o">*</span><span·class="w">·</span><span·class="ss">start</span><span·class="p">;</span><span·class="w">
236 ····</span><span·class="ss">char</span><span·class="o">*</span><span·class="w">·</span><span·class="k">end</span><span·class="p">;</span><span·class="w">236 ····</span><span·class="ss">char</span><span·class="o">*</span><span·class="w">·</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
237 </span><span·class="p"·data-group-id="1162066711-1">}</span><span·class="n">ErtsFreeSegDesc</span><span·class="p">;</span></code></pre><p>To·find·the·smallest·free·segment·that·will·satisfy·a·carrier·allocation237 </span><span·class="p"·data-group-id="0059687626-1">}</span><span·class="n">ErtsFreeSegDesc</span><span·class="p">;</span></code></pre><p>To·find·the·smallest·free·segment·that·will·satisfy·a·carrier·allocation
238 (best·fit),·the·free·segments·are·organized·in·a·tree·sorted·by238 (best·fit),·the·free·segments·are·organized·in·a·tree·sorted·by
239 size·(<code·class="inline">stree</code>).·We·search·in·this·tree·at·allocation.·If·no·free·segment·of239 size·(<code·class="inline">stree</code>).·We·search·in·this·tree·at·allocation.·If·no·free·segment·of
240 sufficient·size·was·found,·the·area·(<code·class="inline">sa</code>·or·<code·class="inline">sua</code>)·is·instead·expanded.240 sufficient·size·was·found,·the·area·(<code·class="inline">sa</code>·or·<code·class="inline">sua</code>)·is·instead·expanded.
241 If·two·or·more·free·segments·with·equal·size·exist,·the·one·at·lowest241 If·two·or·more·free·segments·with·equal·size·exist,·the·one·at·lowest
242 address·is·chosen·for·<code·class="inline">sa</code>·and·highest·address·for·<code·class="inline">sua</code>.</p><p>At·carrier·deallocation,·we·want·to·coalesce·with·any·adjacent·free242 address·is·chosen·for·<code·class="inline">sa</code>·and·highest·address·for·<code·class="inline">sua</code>.</p><p>At·carrier·deallocation,·we·want·to·coalesce·with·any·adjacent·free
243 segments,·to·form·one·large·free·segment.·To·do·that,·all·free243 segments,·to·form·one·large·free·segment.·To·do·that,·all·free
244 segments·are·also·organized·in·a·tree·sorted·in·address·order·(<code·class="inline">atree</code>).</p><p>So,·in·total·we·keep·four·trees·of·free·descriptors·for·the·super244 segments·are·also·organized·in·a·tree·sorted·in·address·order·(<code·class="inline">atree</code>).</p><p>So,·in·total·we·keep·four·trees·of·free·descriptors·for·the·super
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317 ······<p·class="built-using">317 ······<p·class="built-using">
318 ········Built·using318 ········Built·using
319 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the319 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
320 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>320 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
321 ······</p>321 ······</p>
322 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>322 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
323 ····</footer>323 ····</footer>
324 ··</div>324 ··</div>
325 </main>325 </main>
326 </div>326 </div>
327 <script>327 <script>
328 ··function·mermaidLoaded()·{328 ··function·mermaidLoaded()·{
329 ····mermaid.initialize({329 ····mermaid.initialize({
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423 ········Built·using423 ········Built·using
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425 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>425 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
426 ······</p>426 ······</p>
427 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>427 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
428 ····</footer>428 ····</footer>
429 ··</div>429 ··</div>
430 </main>430 </main>
431 </div>431 </div>
432 <script>432 <script>
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560 the·event·occurs.</p></section><section·role="note"·class="admonition·tip"><h4·class="admonition-title·tip">Do</h4><p>Determine·the·order·of·events·by·saving·the·integer·returned·by560 the·event·occurs.</p></section><section·role="note"·class="admonition·tip"><h4·class="admonition-title·tip">Do</h4><p>Determine·the·order·of·events·by·saving·the·integer·returned·by
561 <a·href="erlang.html#unique_integer/1"><code·class="inline">erlang:unique_integer([monotonic])</code></a>·when·the561 <a·href="erlang.html#unique_integer/1"><code·class="inline">erlang:unique_integer([monotonic])</code></a>·when·the
562 event·occurs.·These·integers·are·strictly·monotonically·ordered·on·current562 event·occurs.·These·integers·are·strictly·monotonically·ordered·on·current
563 runtime·system·instance·corresponding·to·creation·time.</p></section><h4>Determine·Order·of·Events·with·Time·of·the·Event</h4><section·role="note"·class="admonition·error"><h4·class="admonition-title·error">Dont</h4><p>Determine·the·order·of·events·by·saving·a·time·stamp·with·<a·href="erlang.html#now/0"><code·class="inline">erlang:now/0</code></a>·when563 runtime·system·instance·corresponding·to·creation·time.</p></section><h4>Determine·Order·of·Events·with·Time·of·the·Event</h4><section·role="note"·class="admonition·error"><h4·class="admonition-title·error">Dont</h4><p>Determine·the·order·of·events·by·saving·a·time·stamp·with·<a·href="erlang.html#now/0"><code·class="inline">erlang:now/0</code></a>·when
564 the·event·occurs.</p></section><section·role="note"·class="admonition·tip"><h4·class="admonition-title·tip">Do</h4><p>Determine·the·order·of·events·by·saving·a·tuple·containing564 the·event·occurs.</p></section><section·role="note"·class="admonition·tip"><h4·class="admonition-title·tip">Do</h4><p>Determine·the·order·of·events·by·saving·a·tuple·containing
565 <a·href="erlang.html#monotonic_time/0">monotonic·time</a>·and·a565 <a·href="erlang.html#monotonic_time/0">monotonic·time</a>·and·a
566 <a·href="erlang.html#unique_integer/1">strictly·monotonically·increasing·integer</a>·as566 <a·href="erlang.html#unique_integer/1">strictly·monotonically·increasing·integer</a>·as
567 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="7943085987-1">(</span><span·class="p"·data-group-id="7943085987-1">)</span><span·class="p">,</span><span·class="w">567 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Time</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="2159800465-1">(</span><span·class="p"·data-group-id="2159800465-1">)</span><span·class="p">,</span><span·class="w">
568 </span><span·class="n">UMI</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">unique_integer</span><span·class="p"·data-group-id="7943085987-2">(</span><span·class="p"·data-group-id="7943085987-3">[</span><span·class="ss">monotonic</span><span·class="p"·data-group-id="7943085987-3">]</span><span·class="p"·data-group-id="7943085987-2">)</span><span·class="p">,</span><span·class="w">568 </span><span·class="n">UMI</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">unique_integer</span><span·class="p"·data-group-id="2159800465-2">(</span><span·class="p"·data-group-id="2159800465-3">[</span><span·class="ss">monotonic</span><span·class="p"·data-group-id="2159800465-3">]</span><span·class="p"·data-group-id="2159800465-2">)</span><span·class="p">,</span><span·class="w">
569 </span><span·class="n">EventTag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7943085987-4">{</span><span·class="n">Time</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UMI</span><span·class="p"·data-group-id="7943085987-4">}</span></code></pre><p>These·tuples·are·strictly·monotonically·ordered·on·the·current·runtime·system569 </span><span·class="n">EventTag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2159800465-4">{</span><span·class="n">Time</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UMI</span><span·class="p"·data-group-id="2159800465-4">}</span></code></pre><p>These·tuples·are·strictly·monotonically·ordered·on·the·current·runtime·system
570 instance·according·to·creation·time.·It·is·important·that·the·monotonic·time570 instance·according·to·creation·time.·It·is·important·that·the·monotonic·time
571 is·in·the·first·element·(the·most·significant·element·when·comparing571 is·in·the·first·element·(the·most·significant·element·when·comparing
572 two-tuples).·Using·the·monotonic·time·in·the·tuples,·you·can·calculate·time572 two-tuples).·Using·the·monotonic·time·in·the·tuples,·you·can·calculate·time
573 between·events.</p><p>If·you·are·interested·in·Erlang·system·time·at·the·time·when·the·event573 between·events.</p><p>If·you·are·interested·in·Erlang·system·time·at·the·time·when·the·event
574 occurred,·you·can·also·save·the·time·offset·before·or·after·saving·the·events574 occurred,·you·can·also·save·the·time·offset·before·or·after·saving·the·events
575 using·<a·href="erlang.html#time_offset/0"><code·class="inline">erlang:time_offset/0</code></a>.·Erlang·monotonic·time·added·with·the·time·offset575 using·<a·href="erlang.html#time_offset/0"><code·class="inline">erlang:time_offset/0</code></a>.·Erlang·monotonic·time·added·with·the·time·offset
576 corresponds·to·Erlang·system·time.</p><p>If·you·are·executing·in·a·mode·where·time·offset·can·change,·and·you·want·to576 corresponds·to·Erlang·system·time.</p><p>If·you·are·executing·in·a·mode·where·time·offset·can·change,·and·you·want·to
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642 ········Built·using642 ········Built·using
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644 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>644 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
645 ······</p>645 ······</p>
646 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>646 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
647 ····</footer>647 ····</footer>
648 ··</div>648 ··</div>
649 </main>649 </main>
650 </div>650 </div>
651 <script>651 <script>
652 ··function·mermaidLoaded()·{652 ··function·mermaidLoaded()·{
653 ····mermaid.initialize({653 ····mermaid.initialize({
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145 on·functions·that·never·return,·as·each·call·pushes·a·frame·that·will145 on·functions·that·never·return,·as·each·call·pushes·a·frame·that·will
146 never·be·removed.</p><p>Another·limitation·is·that·since·the·breakpoint·is·in·the·<em>callee</em>·and·not146 never·be·removed.</p><p>Another·limitation·is·that·since·the·breakpoint·is·in·the·<em>callee</em>·and·not
147 the·<em>caller</em>,·we're·limited·to·the·information·we·have·on·function·ingress.147 the·<em>caller</em>,·we're·limited·to·the·information·we·have·on·function·ingress.
148 This·means·that·we·can't·actually·tell·who·called·us:·since·we're·limited148 This·means·that·we·can't·actually·tell·who·called·us:·since·we're·limited
149 to·inspecting·the·stack·we·can·only·say·where·we're·<em>going·to·return·to</em>,149 to·inspecting·the·stack·we·can·only·say·where·we're·<em>going·to·return·to</em>,
150 which·is·not·quite·the·same·thing.</p><p>As·an·illustration,·when·the·<code·class="inline">caller</code>·option·is·enabled·all·trace·messages150 which·is·not·quite·the·same·thing.</p><p>As·an·illustration,·when·the·<code·class="inline">caller</code>·option·is·enabled·all·trace·messages
151 from·<code·class="inline">bar/1</code>··will·say·that·they·were·called·from·<code·class="inline">foo/0</code>,·even·though·it151 from·<code·class="inline">bar/1</code>··will·say·that·they·were·called·from·<code·class="inline">foo/0</code>,·even·though·it
152 went·through·a·bunch·of·other·functions·on·the·way:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="4782748359-1">(</span><span·class="p"·data-group-id="4782748359-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">152 went·through·a·bunch·of·other·functions·on·the·way:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="5103943622-1">(</span><span·class="p"·data-group-id="5103943622-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
153 ····</span><span·class="nf">lots</span><span·class="p"·data-group-id="4782748359-2">(</span><span·class="p"·data-group-id="4782748359-2">)</span><span·class="p">,</span><span·class="w">153 ····</span><span·class="nf">lots</span><span·class="p"·data-group-id="5103943622-2">(</span><span·class="p"·data-group-id="5103943622-2">)</span><span·class="p">,</span><span·class="w">
154 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">154 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
155 </span><span·class="nf">lots</span><span·class="p"·data-group-id="4782748359-3">(</span><span·class="p"·data-group-id="4782748359-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">155 </span><span·class="nf">lots</span><span·class="p"·data-group-id="5103943622-3">(</span><span·class="p"·data-group-id="5103943622-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
156 ····</span><span·class="nf">&#39;of&#39;</span><span·class="p"·data-group-id="4782748359-4">(</span><span·class="p"·data-group-id="4782748359-4">)</span><span·class="p">.</span><span·class="w">156 ····</span><span·class="nf">&#39;of&#39;</span><span·class="p"·data-group-id="5103943622-4">(</span><span·class="p"·data-group-id="5103943622-4">)</span><span·class="p">.</span><span·class="w">
  
157 </span><span·class="nf">&#39;of&#39;</span><span·class="p"·data-group-id="4782748359-5">(</span><span·class="p"·data-group-id="4782748359-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">&#39;of&#39;</span><span·class="p"·data-group-id="5103943622-5">(</span><span·class="p"·data-group-id="5103943622-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="nf">indirections</span><span·class="p"·data-group-id="4782748359-6">(</span><span·class="p"·data-group-id="4782748359-6">)</span><span·class="p">.</span><span·class="w">158 ····</span><span·class="nf">indirections</span><span·class="p"·data-group-id="5103943622-6">(</span><span·class="p"·data-group-id="5103943622-6">)</span><span·class="p">.</span><span·class="w">
  
159 </span><span·class="nf">indirections</span><span·class="p"·data-group-id="4782748359-7">(</span><span·class="p"·data-group-id="4782748359-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 </span><span·class="nf">indirections</span><span·class="p"·data-group-id="5103943622-7">(</span><span·class="p"·data-group-id="5103943622-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ····</span><span·class="nf">bar</span><span·class="p"·data-group-id="4782748359-8">(</span><span·class="mi">10</span><span·class="p"·data-group-id="4782748359-8">)</span><span·class="p">.</span><span·class="w">160 ····</span><span·class="nf">bar</span><span·class="p"·data-group-id="5103943622-8">(</span><span·class="mi">10</span><span·class="p"·data-group-id="5103943622-8">)</span><span·class="p">.</span><span·class="w">
  
161 </span><span·class="nf">bar</span><span·class="p"·data-group-id="4782748359-9">(</span><span·class="mi">0</span><span·class="p"·data-group-id="4782748359-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">161 </span><span·class="nf">bar</span><span·class="p"·data-group-id="5103943622-9">(</span><span·class="mi">0</span><span·class="p"·data-group-id="5103943622-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
162 ····</span><span·class="ss">done</span><span·class="p">;</span><span·class="w">162 ····</span><span·class="ss">done</span><span·class="p">;</span><span·class="w">
163 </span><span·class="nf">bar</span><span·class="p"·data-group-id="4782748359-10">(</span><span·class="n">N</span><span·class="p"·data-group-id="4782748359-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">163 </span><span·class="nf">bar</span><span·class="p"·data-group-id="5103943622-10">(</span><span·class="n">N</span><span·class="p"·data-group-id="5103943622-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
164 ····</span><span·class="nf">bar</span><span·class="p"·data-group-id="4782748359-11">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4782748359-11">)</span><span·class="p">.</span></code></pre><h3·id="export-tracing"·class="section-heading">164 ····</span><span·class="nf">bar</span><span·class="p"·data-group-id="5103943622-11">(</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5103943622-11">)</span><span·class="p">.</span></code></pre><h3·id="export-tracing"·class="section-heading">
165 ··<a·href="#export-tracing"·class="hover-link">165 ··<a·href="#export-tracing"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">Export·tracing</span>168 ··<span·class="text">Export·tracing</span>
169 </h3>169 </h3>
170 <p>In·the·interpreter,·breakpoints·are·set·inside·the·code·trampoline·for170 <p>In·the·interpreter,·breakpoints·are·set·inside·the·code·trampoline·for
171 export·entries,·and·their·address·vector·is·updated·to·point·to·them.171 export·entries,·and·their·address·vector·is·updated·to·point·to·them.
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386 ······<p·class="built-using">386 ······<p·class="built-using">
387 ········Built·using387 ········Built·using
388 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the388 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
389 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>389 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
390 ······</p>390 ······</p>
391 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>391 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
392 ····</footer>392 ····</footer>
393 ··</div>393 ··</div>
394 </main>394 </main>
395 </div>395 </div>
396 <script>396 <script>
397 ··function·mermaidLoaded()·{397 ··function·mermaidLoaded()·{
398 ····mermaid.initialize({398 ····mermaid.initialize({
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192 ········Built·using192 ········Built·using
193 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the193 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
194 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>194 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
195 ······</p>195 ······</p>
196 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>196 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
197 ····</footer>197 ····</footer>
198 ··</div>198 ··</div>
199 </main>199 </main>
200 </div>200 </div>
201 <script>201 <script>
202 ··function·mermaidLoaded()·{202 ··function·mermaidLoaded()·{
203 ····mermaid.initialize({203 ····mermaid.initialize({
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197 ········Built·using197 ········Built·using
198 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the198 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
199 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>199 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
200 ······</p>200 ······</p>
201 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>201 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
202 ····</footer>202 ····</footer>
203 ··</div>203 ··</div>
204 </main>204 </main>
205 </div>205 </div>
206 <script>206 <script>
207 ··function·mermaidLoaded()·{207 ··function·mermaidLoaded()·{
208 ····mermaid.initialize({208 ····mermaid.initialize({
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129 ····<section·id="moduledoc">129 ····<section·id="moduledoc">
130 <p>zlib·compression·interface.</p><p>This·module·provides·an·API·for·the·zlib·library130 <p>zlib·compression·interface.</p><p>This·module·provides·an·API·for·the·zlib·library
131 (<a·href="http://www.zlib.net">www.zlib.net</a>).·It·is·used·to·compress·and·decompress131 (<a·href="http://www.zlib.net">www.zlib.net</a>).·It·is·used·to·compress·and·decompress
132 data.·The·data·format·is·described·by132 data.·The·data·format·is·described·by
133 <a·href="https://www.ietf.org/rfc/rfc1950.txt">RFC·1950</a>,133 <a·href="https://www.ietf.org/rfc/rfc1950.txt">RFC·1950</a>,
134 <a·href="https://www.ietf.org/rfc/rfc1951.txt">RFC·1951</a>,·and134 <a·href="https://www.ietf.org/rfc/rfc1951.txt">RFC·1951</a>,·and
135 <a·href="https://www.ietf.org/rfc/rfc1952.txt">RFC·1952</a>.</p><p>A·typical·(compress)·usage·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Z</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="1756503889-1">(</span><span·class="p"·data-group-id="1756503889-1">)</span><span·class="p">,</span><span·class="w">135 <a·href="https://www.ietf.org/rfc/rfc1952.txt">RFC·1952</a>.</p><p>A·typical·(compress)·usage·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Z</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="2927800750-1">(</span><span·class="p"·data-group-id="2927800750-1">)</span><span·class="p">,</span><span·class="w">
136 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateInit</span><span·class="p"·data-group-id="1756503889-2">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="ss">default</span><span·class="p"·data-group-id="1756503889-2">)</span><span·class="p">,</span><span·class="w">136 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateInit</span><span·class="p"·data-group-id="2927800750-2">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="ss">default</span><span·class="p"·data-group-id="2927800750-2">)</span><span·class="p">,</span><span·class="w">
  
137 </span><span·class="n">Compress</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1756503889-3">(</span><span·class="ss">end_of_data</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Cont</span><span·class="p"·data-group-id="1756503889-3">)</span><span·class="w">·</span><span·class="p">-&gt;</[·...·truncated·by·diffoscope;·len:·123,·SHA:·7420a37b7a42642b05cff455320662e46402a23ead35b0b67af4b695a72ee059·...·]-4">]</span><span·class="p">;</span><span·class="w">137 </span><span·class="n">Compress</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="2927800750-3">(</span><span·class="ss">end_of_data</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Cont</span><span·class="p"·data-group-id="2927800750-3">)</span><span·class="w">·</span><span·class="p">-&gt;</[·...·truncated·by·diffoscope;·len:·123,·SHA:·1d4117379e48b83fbbf46aa4da6bf354f399e2ccdd14dfc68ab204ab65b4eb28·...·]-4">]</span><span·class="p">;</span><span·class="w">
138 ··············</span><span·class="p"·data-group-id="1756503889-5">(</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cont</span><span·class="p"·data-group-id="1756503889-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 ··············</span><span·class="p"·data-group-id="2927800750-5">(</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cont</span><span·class="p"·data-group-id="2927800750-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ·················</span><span·class="p"·data-group-id="1756503889-6">[</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="1756503889-7">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span[·...·truncated·by·diffoscope;·len:·436,·SHA:·787d36506e2de1c44e9758ee90584cc61d6ca1d774da67d562acad02ef1e0c29·...·]-6">]</span><span·class="w">139 ·················</span><span·class="p"·data-group-id="2927800750-6">[</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="2927800750-7">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span[·...·truncated·by·diffoscope;·len:·436,·SHA:·ecdf8fb5d69826ac0e88f6ade14930ee1789f8d57bfae3de37308a110d2a5986·...·]-6">]</span><span·class="w">
140 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">140 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
141 </span><span·class="n">Compressed</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Compress</span><span·class="p"·data-group-id="1756503889-10">(</span><span·class="n">Read</span><span·class="p"·data-group-id="1756503889-11">(</span><span·class="p"·data-group-id="1756503889-11">)</span><span·class="p">,</span><span·class="n">Compress</span><span·class="p"·data-group-id="1756503889-10">)</span><span·class="p">,</span><span·class="w">141 </span><span·class="n">Compressed</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Compress</span><span·class="p"·data-group-id="2927800750-10">(</span><span·class="n">Read</span><span·class="p"·data-group-id="2927800750-11">(</span><span·class="p"·data-group-id="2927800750-11">)</span><span·class="p">,</span><span·class="n">Compress</span><span·class="p"·data-group-id="2927800750-10">)</span><span·class="p">,</span><span·class="w">
142 </span><span·class="n">Last</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="1756503889-12">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1756503889-13">[</span><span·class="p"·data-group-id="1756503889-13">]</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·66,·SHA:·0aa4fbf6fe229b7965ef259ad2d85a66aba19a9d2b3cf8823db1729a3138eecc·...·]-12">)</span><span·class="p">,</span><span·class="w">142 </span><span·class="n">Last</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="2927800750-12">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2927800750-13">[</span><span·class="p"·data-group-id="2927800750-13">]</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·66,·SHA:·e87aadc5f65a5a9a867f63d77ab05ad84dec6a54b92ce16b5b012a0eb72b0b13·...·]-12">)</span><span·class="p">,</span><span·class="w">
143 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateEnd</span><span·class="p"·data-group-id="1756503889-14">(</span><span·class="n">Z</span><span·class="p"·data-group-id="1756503889-14">)</span><span·class="p">,</span><span·class="w">143 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateEnd</span><span·class="p"·data-group-id="2927800750-14">(</span><span·class="n">Z</span><span·class="p"·data-group-id="2927800750-14">)</span><span·class="p">,</span><span·class="w">
144 </span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1756503889-15">(</span><span·class="n">Z</span><span·class="p"·data-group-id="1756503889-15">)</span><span·class="p">,</span><span·class="w">144 </span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="2927800750-15">(</span><span·class="n">Z</span><span·class="p"·data-group-id="2927800750-15">)</span><span·class="p">,</span><span·class="w">
145 </span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="1756503889-16">(</span><span·class="p"·data-group-id="1756503889-17">[</span><span·class="n">Compressed</span><span·class="p">|</span><span·class="n">Last</span><span·class="p"·data-group-id="1756503889-17">]</span><span·class="p"·data-group-id="1756503889-16">)</span></code></pre><p>In·all·functions·errors,·<code·class="inline">{'EXIT',{Reason,Backtrace}}</code>,·can·be·thrown,·where145 </span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="2927800750-16">(</span><span·class="p"·data-group-id="2927800750-17">[</span><span·class="n">Compressed</span><span·class="p">|</span><span·class="n">Last</span><span·class="p"·data-group-id="2927800750-17">]</span><span·class="p"·data-group-id="2927800750-16">)</span></code></pre><p>In·all·functions·errors,·<code·class="inline">{'EXIT',{Reason,Backtrace}}</code>,·can·be·thrown,·where
146 <code·class="inline">Reason</code>·describes·the·error.</p><p>Typical·<code·class="inline">Reason</code>s:</p><ul><li><p><strong><code·class="inline">badarg</code></strong>·-·Bad·argument.</p></li><li><p><strong><code·class="inline">not_initialized</code></strong>·-·The·stream·hasn't·been·initialized,·eg.·if146 <code·class="inline">Reason</code>·describes·the·error.</p><p>Typical·<code·class="inline">Reason</code>s:</p><ul><li><p><strong><code·class="inline">badarg</code></strong>·-·Bad·argument.</p></li><li><p><strong><code·class="inline">not_initialized</code></strong>·-·The·stream·hasn't·been·initialized,·eg.·if
147 <a·href="#inflateInit/1"><code·class="inline">inflateInit/1</code></a>·wasn't·called·prior·to·a·call·to·<a·href="#inflate/2"><code·class="inline">inflate/2</code></a>.</p></li><li><p><strong><code·class="inline">not_on_controlling_process</code></strong>·-·The·stream·was·used·by·a·process·that147 <a·href="#inflateInit/1"><code·class="inline">inflateInit/1</code></a>·wasn't·called·prior·to·a·call·to·<a·href="#inflate/2"><code·class="inline">inflate/2</code></a>.</p></li><li><p><strong><code·class="inline">not_on_controlling_process</code></strong>·-·The·stream·was·used·by·a·process·that
148 doesn't·control·it.·Use·<a·href="#set_controlling_process/2"><code·class="inline">set_controlling_process/2</code></a>·if·you·need·to·transfer·a148 doesn't·control·it.·Use·<a·href="#set_controlling_process/2"><code·class="inline">set_controlling_process/2</code></a>·if·you·need·to·transfer·a
149 stream·to·a·different·process.</p></li><li><p><strong><code·class="inline">data_error</code></strong>·-·The·data·contains·errors.</p></li><li><p><strong><code·class="inline">stream_error</code></strong>·-·Inconsistent·stream·state.</p></li><li><p><strong><code·class="inline">{need_dictionary,Adler32}</code></strong>·-·See·<a·href="#inflate/2"><code·class="inline">inflate/2</code></a>.</p></li></ul>149 stream·to·a·different·process.</p></li><li><p><strong><code·class="inline">data_error</code></strong>·-·The·data·contains·errors.</p></li><li><p><strong><code·class="inline">stream_error</code></strong>·-·Inconsistent·stream·state.</p></li><li><p><strong><code·class="inline">{need_dictionary,Adler32}</code></strong>·-·See·<a·href="#inflate/2"><code·class="inline">inflate/2</code></a>.</p></li></ul>
150 ····</section>150 ····</section>
  
151 </div>151 </div>
Offset 827, 19 lines modifiedOffset 827, 19 lines modified
827 all·input·data·available·so·far.·Flushing·can·degrade·compression·for·some827 all·input·data·available·so·far.·Flushing·can·degrade·compression·for·some
828 compression·algorithms;·thus,·use·it·only·when·necessary.</p><p>If·<code·class="inline">Flush</code>·is·set·to·<code·class="inline">full</code>,·all·output·is·flushed·as·with·<code·class="inline">sync</code>,·and·the828 compression·algorithms;·thus,·use·it·only·when·necessary.</p><p>If·<code·class="inline">Flush</code>·is·set·to·<code·class="inline">full</code>,·all·output·is·flushed·as·with·<code·class="inline">sync</code>,·and·the
829 compression·state·is·reset·so·that·decompression·can·restart·from·this·point·if829 compression·state·is·reset·so·that·decompression·can·restart·from·this·point·if
830 previous·compressed·data·has·been·damaged·or·if·random·access·is·desired.·Using830 previous·compressed·data·has·been·damaged·or·if·random·access·is·desired.·Using
831 <code·class="inline">full</code>·too·often·can·seriously·degrade·the·compression.</p><p>If·<code·class="inline">Flush</code>·is·set·to·<code·class="inline">finish</code>,·pending·input·is·processed,·pending·output·is831 <code·class="inline">full</code>·too·often·can·seriously·degrade·the·compression.</p><p>If·<code·class="inline">Flush</code>·is·set·to·<code·class="inline">finish</code>,·pending·input·is·processed,·pending·output·is
832 flushed,·and·<a·href="#deflate/3"><code·class="inline">deflate/3</code></a>·returns.·Afterwards·the·only·possible832 flushed,·and·<a·href="#deflate/3"><code·class="inline">deflate/3</code></a>·returns.·Afterwards·the·only·possible
833 operations·on·the·stream·are·<a·href="#deflateReset/1"><code·class="inline">deflateReset/1</code></a>·or·<a·href="#deflateEnd/1"><code·class="inline">deflateEnd/1</code></a>.</p><p><code·class="inline">Flush</code>·can·be·set·to·<code·class="inline">finish</code>·immediately·after833 operations·on·the·stream·are·<a·href="#deflateReset/1"><code·class="inline">deflateReset/1</code></a>·or·<a·href="#deflateEnd/1"><code·class="inline">deflateEnd/1</code></a>.</p><p><code·class="inline">Flush</code>·can·be·set·to·<code·class="inline">finish</code>·immediately·after
834 <a·href="#deflateInit/1"><code·class="inline">deflateInit</code></a>·if·all·compression·is·to·be·done·in·one·step.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateInit</span><span·class="p"·data-group-id="4654073267-1">(</span><span·class="n">Z</span><span·class="p"·data-group-id="4654073267-1">)</span><span·class="p">,</span><span·class="w">834 <a·href="#deflateInit/1"><code·class="inline">deflateInit</code></a>·if·all·compression·is·to·be·done·in·one·step.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateInit</span><span·class="p"·data-group-id="6426852942-1">(</span><span·class="n">Z</span><span·class="p"·data-group-id="6426852942-1">)</span><span·class="p">,</span><span·class="w">
835 </span><span·class="n">B1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="4654073267-2">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="4654073267-2">)</span><span·class="p">,</span><span·class="w">835 </span><span·class="n">B1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="6426852942-2">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="6426852942-2">)</span><span·class="p">,</span><span·class="w">
836 </span><span·class="n">B2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="4654073267-3">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="p"·data-group-id="4654073267-4">&lt;&lt;</span><span·class="w">·</span><span·class="p"·data-group-id="4654073267-4">&gt;&gt;</span><span·class="p">,</span><span·class="ss">f[·...·truncated·by·diffoscope;·len:·53,·SHA:·1734926867054a763ee7875f0b8c7e69ee25026b1634e580dd0191cc5becf09c·...·]-3">)</span><span·class="p">,</span><span·class="w">836 </span><span·class="n">B2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflate</span><span·class="p"·data-group-id="6426852942-3">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="p"·data-group-id="6426852942-4">&lt;&lt;</span><span·class="w">·</span><span·class="p"·data-group-id="6426852942-4">&gt;&gt;</span><span·class="p">,</span><span·class="ss">f[·...·truncated·by·diffoscope;·len:·53,·SHA:·946fc6d9ce9ac8d3633a5242b8d97cbe6d18f211fd92b39b37ae8c4e193fcbd5·...·]-3">)</span><span·class="p">,</span><span·class="w">
837 </span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateEnd</span><span·class="p"·data-group-id="4654073267-5">(</span><span·class="n">Z</span><span·class="p"·data-group-id="4654073267-5">)</span><span·class="p">,</span><span·class="w">837 </span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">deflateEnd</span><span·class="p"·data-group-id="6426852942-5">(</span><span·class="n">Z</span><span·class="p"·data-group-id="6426852942-5">)</span><span·class="p">,</span><span·class="w">
838 </span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="4654073267-6">(</span><span·class="p"·data-group-id="4654073267-7">[</span><span·class="n">B1</span><span·class="p">,</span><span·class="n">B2</span><span·class="p"·data-group-id="4654073267-7">]</span><span·class="p"·data-group-id="4654073267-6">)</span></code></pre>838 </span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="6426852942-6">(</span><span·class="p"·data-group-id="6426852942-7">[</span><span·class="n">B1</span><span·class="p">,</span><span·class="n">B2</span><span·class="p"·data-group-id="6426852942-7">]</span><span·class="p"·data-group-id="6426852942-6">)</span></code></pre>
839 ··</section>839 ··</section>
840 </section>840 </section>
841 <section·class="detail"·id="deflateEnd/1">841 <section·class="detail"·id="deflateEnd/1">
  
842 ··<div·class="detail-header">842 ··<div·class="detail-header">
843 ····<a·href="#deflateEnd/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">843 ····<a·href="#deflateEnd/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
844 ······<i·class="ri-link-m"·aria-hidden="true"></i>844 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1349, 28 lines modifiedOffset 1349, 28 lines modified
1349 <p>Initializes·the·decompression·dictionary·from·the·specified·uncompressed·byte1349 <p>Initializes·the·decompression·dictionary·from·the·specified·uncompressed·byte
1350 sequence.</p><p>This·function·must·be·called·as·a·response·to·an·inflate·operation1350 sequence.</p><p>This·function·must·be·called·as·a·response·to·an·inflate·operation
1351 (eg.·<a·href="#safeInflate/2"><code·class="inline">safeInflate/2</code></a>)·returning·<code·class="inline">{need_dictionary,Adler,Output}</code>·or·in·the·case1351 (eg.·<a·href="#safeInflate/2"><code·class="inline">safeInflate/2</code></a>)·returning·<code·class="inline">{need_dictionary,Adler,Output}</code>·or·in·the·case
1352 of·deprecated·functions,·throwing·an1352 of·deprecated·functions,·throwing·an
1353 <code·class="inline">{'EXIT',{{need_dictionary,Adler},_StackTrace}}</code>·exception.</p><p>The·dictionary·chosen·by·the·compressor·can·be·determined·from·the·Adler·value1353 <code·class="inline">{'EXIT',{{need_dictionary,Adler},_StackTrace}}</code>·exception.</p><p>The·dictionary·chosen·by·the·compressor·can·be·determined·from·the·Adler·value
1354 returned·or·thrown·by·the·call·to·the·inflate·function.·The·compressor·and1354 returned·or·thrown·by·the·call·to·the·inflate·function.·The·compressor·and
1355 decompressor·must·use·the·same·dictionary·(See·<a·href="#deflateSetDictionary/2"><code·class="inline">deflateSetDictionary/2</code></a>).</p><p>After·setting·the·dictionary·the·inflate·operation·should·be·retried·without·new1355 decompressor·must·use·the·same·dictionary·(See·<a·href="#deflateSetDictionary/2"><code·class="inline">deflateSetDictionary/2</code></a>).</p><p>After·setting·the·dictionary·the·inflate·operation·should·be·retried·without·new
1356 input.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">deprecated_unpack</span><span·class="p"·data-group-id="4300824021-1">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4300824021-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1356 input.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">deprecated_unpack</span><span·class="p"·data-group-id="4203203585-1">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4203203585-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1357 ·····</span><span·class="k">case</span><span·class="w">·</span><span·class="k">catch</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4300824021-2">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p"·data-group-id="4300824021-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">1357 ·····</span><span·class="k">case</span><span·class="w">·</span><span·class="k">catch</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4203203585-2">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p"·data-group-id="4203203585-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
1358 ··········</span><span·class="p"·data-group-id="4300824021-3">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4300824021-4">{</span><span·class="p"·data-group-id="4300824021-5">{</span><span·class="ss">need_dictionary</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·244,·SHA:·340543cd5d736d6285f59b113f7499587b66908bf4b8ba89442b6ce6dc37ccf1·...·]-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1358 ··········</span><span·class="p"·data-group-id="4203203585-3">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4203203585-4">{</span><span·class="p"·data-group-id="4203203585-5">{</span><span·class="ss">need_dictionary</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·244,·SHA:·e577aaa4de09ce6172c61e1eb14b7667dd06e6ddcaa6256e6eb7c2b8c50e47f2·...·]-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1359 ·················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateSetDictionary</span><span·class="p"·data-group-id="4300824021-6">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4300824021-6">)</span><span·class="p">,</span><span·class="w">1359 ·················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateSetDictionary</span><span·class="p"·data-group-id="4203203585-6">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4203203585-6">)</span><span·class="p">,</span><span·class="w">
1360 ·················</span><span·class="n">Uncompressed</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4300824021-7">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4300824021-8">[</span><span·class="p"·data-group-id="4300824021-8">]</span><span·class="p"·data-group-id="4300824021-7">)</span><span·class="p">;</span><span·class="w">1360 ·················</span><span·class="n">Uncompressed</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4203203585-7">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4203203585-8">[</span><span·class="p"·data-group-id="4203203585-8">]</span><span·class="p"·data-group-id="4203203585-7">)</span><span·class="p">;</span><span·class="w">
1361 ··········</span><span·class="n">Uncompressed</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1361 ··········</span><span·class="n">Uncompressed</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1362 ·················</span><span·class="n">Uncompressed</span><span·class="w">1362 ·················</span><span·class="n">Uncompressed</span><span·class="w">
1363 ·····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">1363 ·····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
1364 </span><span·class="nf">new_unpack</span><span·class="p"·data-group-id="4300824021-9">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4300824021-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1364 </span><span·class="nf">new_unpack</span><span·class="p"·data-group-id="4203203585-9">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4203203585-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1365 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4300824021-10">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4300824021-11">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·299,·SHA:·c5db6ed8f6a3fb23a49292a20d0a2c9a969d6f77ad8a22e82b2aa474981c19ce·...·]-10">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">1365 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4203203585-10">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4203203585-11">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·299,·SHA:·7f46ed14ce54ba34fba5812349401dbce98a249a58b8b32a47929f5a809da660·...·]-10">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
1366 ········</span><span·class="p"·data-group-id="4300824021-13">{</span><span·class="ss">need_dictionary</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">DictId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Output</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·295d0366915e2617f29d193804091fb36547942807fd411a97dbfb61c49afe50·...·]-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1366 ········</span><span·class="p"·data-group-id="4203203585-13">{</span><span·class="ss">need_dictionary</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">DictId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Output</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·e3bdf3cd3897413b920a77aaf46a8dd17e9c28d50a27f07204d6360678a47583·...·]-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1367 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateSetDictionary</span><span·class="p"·data-group-id="4300824021-14">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4300824021-14">)</span><span·class="p">,</span><span·class="w">1367 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateSetDictionary</span><span·class="p"·data-group-id="4203203585-14">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dict</span><span·class="p"·data-group-id="4203203585-14">)</span><span·class="p">,</span><span·class="w">
1368 ············</span><span·class="p"·data-group-id="4300824021-15">[</span><span·class="n">Output</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4300824021-16">(</s[·...·truncated·by·diffoscope;·len:·279,·SHA:·8abb0977256ad75a1ec5b7baeb6868030fac7c721666ceb9eab8f356b8bb3618·...·]-15">]</span><span·class="p">;</span><span·class="w">1368 ············</span><span·class="p"·data-group-id="4203203585-15">[</span><span·class="n">Output</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflate</span><span·class="p"·data-group-id="4203203585-16">(</s[·...·truncated·by·diffoscope;·len:·279,·SHA:·5eb14ddda5e18e5bc543b380be0166f3b853d5598cb34fda639939511c250695·...·]-15">]</span><span·class="p">;</span><span·class="w">
1369 ········</span><span·class="n">Uncompressed</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1369 ········</span><span·class="n">Uncompressed</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1370 ············</span><span·class="n">Uncompressed</span><span·class="w">1370 ············</span><span·class="n">Uncompressed</span><span·class="w">
1371 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre>1371 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre>
1372 ··</section>1372 ··</section>
1373 </section>1373 </section>
1374 <section·class="detail"·id="open/0">1374 <section·class="detail"·id="open/0">
  
Offset 1434, 26 lines modifiedOffset 1434, 26 lines modified
1434 implementation-defined·threshold.·It's·useful·when·decompressing·untrusted·input1434 implementation-defined·threshold.·It's·useful·when·decompressing·untrusted·input
1435 which·could·have·been·maliciously·crafted·to·expand·until·the·system·runs·out·of1435 which·could·have·been·maliciously·crafted·to·expand·until·the·system·runs·out·of
1436 memory.</p><p>This·function·returns·<code·class="inline">{continue·|·finished,·Output}</code>,·where·Output·is·the·data1436 memory.</p><p>This·function·returns·<code·class="inline">{continue·|·finished,·Output}</code>,·where·Output·is·the·data
1437 that·was·decompressed·in·this·call.·New·input·can·be·queued·up·on·each·call·if1437 that·was·decompressed·in·this·call.·New·input·can·be·queued·up·on·each·call·if
1438 desired,·and·the·function·will·return·<code·class="inline">{finished,·Output}</code>·once·all·queued·data1438 desired,·and·the·function·will·return·<code·class="inline">{finished,·Output}</code>·once·all·queued·data
1439 has·been·decompressed.</p><p>This·function·can·introduce·some·output·latency·(reading·input·without·producing1439 has·been·decompressed.</p><p>This·function·can·introduce·some·output·latency·(reading·input·without·producing
1440 any·output).</p><p>If·a·preset·dictionary·is·required·for·further·decompression,·this·function1440 any·output).</p><p>If·a·preset·dictionary·is·required·for·further·decompression,·this·function
1441 returns·a·<code·class="inline">need_dictionary</code>·tuple.·See·<a·href="#inflateSetDictionary/2"><code·class="inline">inflateSetDictionary/2</code></a>)·for·details.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">walk</span><span·class="p"·data-group-id="2923996605-1">(</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p"·data-group-id="2923996605-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1441 returns·a·<code·class="inline">need_dictionary</code>·tuple.·See·<a·href="#inflateSetDictionary/2"><code·class="inline">inflateSetDictionary/2</code></a>)·for·details.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">walk</span><span·class="p"·data-group-id="6623900811-1">(</span><span·class="n">Compressed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p"·data-group-id="6623900811-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1442 ····</span><span·class="n">Z</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="2923996605-2">(</span><span·class="p"·data-group-id="2923996605-2">)</span><span·class="p">,</span><span·class="w">1442 ····</span><span·class="n">Z</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="6623900811-2">(</span><span·class="p"·data-group-id="6623900811-2">)</span><span·class="p">,</span><span·class="w">
1443 ····</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateInit</span><span·class="p"·data-group-id="2923996605-3">(</span><span·class="n">Z</span><span·class="p"·data-group-id="2923996605-3">)</span><span·class="p">,</span><span·class="w">1443 ····</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateInit</span><span·class="p"·data-group-id="6623900811-3">(</span><span·class="n">Z</span><span·class="p"·data-group-id="6623900811-3">)</span><span·class="p">,</span><span·class="w">
1444 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="2923996605-4">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">safeInflate</sp[·...·truncated·by·diffoscope;·len:·255,·SHA:·59bceb35ed6cf3d84177b86fb6a12893cb37f5a97f8555e3fb8eed43eb7f2f8b·...·]-4">)</span><span·class="p">,</span><span·class="w">1444 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="6623900811-4">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">safeInflate</sp[·...·truncated·by·diffoscope;·len:·255,·SHA:·f0ad35896d908c96e5550da7413c6a077a2086f75b76286f9927867dfacdc6cb·...·]-4">)</span><span·class="p">,</span><span·class="w">
1445 ····</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateEnd</span><span·class="p"·data-group-id="2923996605-6">(</span><span·class="n">Z</span><span·class="p"·data-group-id="2923996605-6">)</span><span·class="p">,</span><span·class="w">1445 ····</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">inflateEnd</span><span·class="p"·data-group-id="6623900811-6">(</span><span·class="n">Z</span><span·class="p"·data-group-id="6623900811-6">)</span><span·class="p">,</span><span·class="w">
1446 ····</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="2923996605-7">(</span><span·class="n">Z</span><span·class="p"·data-group-id="2923996605-7">)</span><span·class="p">.</span><span·class="w">1446 ····</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="6623900811-7">(</span><span·class="n">Z</span><span·class="p"·data-group-id="6623900811-7">)</span><span·class="p">.</span><span·class="w">
  
1447 </span><span·class="nf">loop</span><span·class="p"·data-group-id="2923996605-8">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2923996605-9">{</span><span·class="ss">continue</span[·...·truncated·by·diffoscope;·len:·172,·SHA:·e7c6882d641e23dfe48aeb889725f1bd9f232b9f40acf4e28034971ad7627a08·...·]-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1447 </span><span·class="nf">loop</span><span·class="p"·data-group-id="6623900811-8">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6623900811-9">{</span><span·class="ss">continue</span[·...·truncated·by·diffoscope;·len:·172,·SHA:·08f70b0e2a3e902a1522d3a51dd67dd6322eaa371e789655de4bf95f317fcf20·...·]-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1448 ····</span><span·class="n">Handler</span><span·class="p"·data-group-id="2923996605-10">(</span><span·class="n">Output</span><span·class="p"·data-group-id="2923996605-10">)</span><span·class="p">,</span><span·class="w">1448 ····</span><span·class="n">Handler</span><span·class="p"·data-group-id="6623900811-10">(</span><span·class="n">Output</span><span·class="p"·data-group-id="6623900811-10">)</span><span·class="p">,</span><span·class="w">
1449 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="2923996605-11">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">safeInflate</s[·...·truncated·by·diffoscope;·len:·333,·SHA:·c010bd7c27ec51c053cb747dfda6aaac1fa5c63c8c15c9bae9088b673f9004a9·...·]-11">)</span><span·class="p">;</span><span·class="w">1449 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="6623900811-11">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">zlib</span><span·class="p">:</span><span·class="nf">safeInflate</s[·...·truncated·by·diffoscope;·len:·333,·SHA:·0b1d80bdaf871e5775e78890afab392f674885f7e7ad8b9ae6b9f9005089fc4c·...·]-11">)</span><span·class="p">;</span><span·class="w">
1450 </span><span·class="nf">loop</span><span·class="p"·data-group-id="2923996605-14">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2923996605-15">{</span><span·class="ss">finished</sp[·...·truncated·by·diffoscope;·len:·175,·SHA:·16b8b14d2a318271b83bc23854b87ad147ca0e2769b6599402fc488a73c838b6·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1450 </span><span·class="nf">loop</span><span·class="p"·data-group-id="6623900811-14">(</span><span·class="n">Z</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handler</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6623900811-15">{</span><span·class="ss">finished</sp[·...·truncated·by·diffoscope;·len:·175,·SHA:·48cd19e3f12dfd2033d00336b1b5743ddce09576379a4232147a4af9b1644fc5·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1451 ····</span><span·class="n">Handler</span><span·class="p"·data-group-id="2923996605-16">(</span><span·class="n">Output</span><span·class="p"·data-group-id="2923996605-16">)</span><span·class="p">.</span></code></pre>1451 ····</span><span·class="n">Handler</span><span·class="p"·data-group-id="6623900811-16">(</span><span·class="n">Output</span><span·class="p"·data-group-id="6623900811-16">)</span><span·class="p">.</span></code></pre>
1452 ··</section>1452 ··</section>
1453 </section>1453 </section>
1454 <section·class="detail"·id="set_controlling_process/2">1454 <section·class="detail"·id="set_controlling_process/2">
  
1455 ··<div·class="detail-header">1455 ··<div·class="detail-header">
1456 ····<a·href="#set_controlling_process/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1456 ····<a·href="#set_controlling_process/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1457 ······<i·class="ri-link-m"·aria-hidden="true"></i>1457 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1576 ······<p·class="built-using">1576 ······<p·class="built-using">
1577 ········Built·using1577 ········Built·using
1578 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1578 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1579 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1579 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1580 ······</p>1580 ······</p>
1581 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1581 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1582 ····</footer>1582 ····</footer>
1583 ··</div>1583 ··</div>
1584 </main>1584 </main>
1585 </div>1585 </div>
1586 <script>1586 <script>
1587 ··function·mermaidLoaded()·{1587 ··function·mermaidLoaded()·{
1588 ····mermaid.initialize({1588 ····mermaid.initialize({
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143 ······<p·class="built-using">143 ······<p·class="built-using">
144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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181 ······<p·class="built-using">181 ······<p·class="built-using">
182 ········Built·using182 ········Built·using
183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
185 ······</p>185 ······</p>
186 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>186 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
190 </div>190 </div>
191 <script>191 <script>
192 ··function·mermaidLoaded()·{192 ··function·mermaidLoaded()·{
193 ····mermaid.initialize({193 ····mermaid.initialize({
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139 ····location·INTEGER·{home(0),field(1),roving(2)},139 ····location·INTEGER·{home(0),field(1),roving(2)},
140 ····age·INTEGER·OPTIONAL140 ····age·INTEGER·OPTIONAL
141 ··}141 ··}
142 END</code></pre><p>This·file·must·be·compiled·before·it·can·be·used.·The·ASN.1·compiler·checks·that142 END</code></pre><p>This·file·must·be·compiled·before·it·can·be·used.·The·ASN.1·compiler·checks·that
143 the·syntax·is·correct·and·that·the·text·represents·proper·ASN.1·code·before143 the·syntax·is·correct·and·that·the·text·represents·proper·ASN.1·code·before
144 generating·an·abstract·syntax·tree.·The·code·generator·then·uses·the·abstract144 generating·an·abstract·syntax·tree.·The·code·generator·then·uses·the·abstract
145 syntax·tree·to·generate·code.</p><p>The·generated·Erlang·files·are·placed·in·the·current·directory·or·in·the145 syntax·tree·to·generate·code.</p><p>The·generated·Erlang·files·are·placed·in·the·current·directory·or·in·the
146 directory·specified·with·option·<code·class="inline">{outdir,Dir}</code>.</p><p>The·compiler·can·be·called·from·the·Erlang·shell·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">asn1ct</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="7130721995-1">(</span><span·class="s">&quot;People&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7130721995-2">[</span><span·class="ss">ber</span><span·class="p"·data-group-id="7130721995-2">]</span><span·class=[·...·truncated·by·diffoscope;·len:·29,·SHA:·da840b2fa3a0e3b393142a1a82dd1403743536268b26fef06b81c807d1788931·...·]-1">)</span><span·class="p">.</span><span·class="w">146 directory·specified·with·option·<code·class="inline">{outdir,Dir}</code>.</p><p>The·compiler·can·be·called·from·the·Erlang·shell·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">asn1ct</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="1745706310-1">(</span><span·class="s">&quot;People&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1745706310-2">[</span><span·class="ss">ber</span><span·class="p"·data-group-id="1745706310-2">]</span><span·class=[·...·truncated·by·diffoscope;·len:·29,·SHA:·8f6f9880cb08a208e610c3a12c2e8b2438106996903694e1fc5a88559ece9a19·...·]-1">)</span><span·class="p">.</span><span·class="w">
147 </span><span·class="ss">ok</span></code></pre><p>Option·<code·class="inline">verbose</code>·can·be·added·to·get·information·about·the·generated·files:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">asn1ct</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="6115674076-1">(</span><span·class="s">&quot;People&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6115674076-2">[</span><span·class="ss">ber</span><span·class="p">,</span><span·class="ss">verbose</span><span·clas[·...·truncated·by·diffoscope;·len:·84,·SHA:·7eea42c2794ac16483dc95d45b306b171773903fc9834dc8b224891179189148·...·]-1">)</span><span·class="p">.</span><span·class="w">147 </span><span·class="ss">ok</span></code></pre><p>Option·<code·class="inline">verbose</code>·can·be·added·to·get·information·about·the·generated·files:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">asn1ct</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="4847456304-1">(</span><span·class="s">&quot;People&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4847456304-2">[</span><span·class="ss">ber</span><span·class="p">,</span><span·class="ss">verbose</span><span·clas[·...·truncated·by·diffoscope;·len:·84,·SHA:·ffbf208ce1851cd9d44ce18570ac03a53efda32b186be482ef9d407ee1d7b8e4·...·]-1">)</span><span·class="p">.</span><span·class="w">
148 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">ASN</span><span·class="p">.</span><span·class="mi">1</span><span·class="w">·</span><span·class="ss">compiling</span><span·class="w">·</span><span·class="s">&quot;People.asn&quot;</span><span·class="w">148 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">ASN</span><span·class="p">.</span><span·class="mi">1</span><span·class="w">·</span><span·class="ss">compiling</span><span·class="w">·</span><span·class="s">&quot;People.asn&quot;</span><span·class="w">
149 </span><span·class="o">--</span><span·class="p"·data-group-id="6115674076-3">{</span><span·class="ss">generated</span><span·class="p">,</span><span·class="s">&quot;People.asn1db&quot;</span><span·class="p"·data-group-id="6115674076-3">}</span><span·class="o">--</span><span·class="w">149 </span><span·class="o">--</span><span·class="p"·data-group-id="4847456304-3">{</span><span·class="ss">generated</span><span·class="p">,</span><span·class="s">&quot;People.asn1db&quot;</span><span·class="p"·data-group-id="4847456304-3">}</span><span·class="o">--</span><span·class="w">
150 </span><span·class="o">--</span><span·class="p"·data-group-id="6115674076-4">{</span><span·class="ss">generated</span><span·class="p">,</span><span·class="s">&quot;People.hrl&quot;</span><span·class="p"·data-group-id="6115674076-4">}</span><span·class="o">--</span><span·class="w">150 </span><span·class="o">--</span><span·class="p"·data-group-id="4847456304-4">{</span><span·class="ss">generated</span><span·class="p">,</span><span·class="s">&quot;People.hrl&quot;</span><span·class="p"·data-group-id="4847456304-4">}</span><span·class="o">--</span><span·class="w">
151 </span><span·class="o">--</span><span·class="p"·data-group-id="6115674076-5">{</span><span·class="ss">generated</span><span·class="p">,</span><span·class="s">&quot;People.erl&quot;</span><span·class="p"·data-group-id="6115674076-5">}</span><span·class="o">--</span><span·class="w">151 </span><span·class="o">--</span><span·class="p"·data-group-id="4847456304-5">{</span><span·class="ss">generated</span><span·class="p">,</span><span·class="s">&quot;People.erl&quot;</span><span·class="p"·data-group-id="4847456304-5">}</span><span·class="o">--</span><span·class="w">
152 </span><span·class="ss">ok</span></code></pre><p>ASN.1·module·<code·class="inline">People</code>·is·now·accepted·and·the·abstract·syntax·tree·is·saved·in152 </span><span·class="ss">ok</span></code></pre><p>ASN.1·module·<code·class="inline">People</code>·is·now·accepted·and·the·abstract·syntax·tree·is·saved·in
153 file·<code·class="inline">People.asn1db</code>.·The·generated·Erlang·code·is·compiled·using·the·Erlang153 file·<code·class="inline">People.asn1db</code>.·The·generated·Erlang·code·is·compiled·using·the·Erlang
154 compiler·and·loaded·into·the·Erlang·runtime·system.·There·is·now·an·API·for154 compiler·and·loaded·into·the·Erlang·runtime·system.·There·is·now·an·API·for
155 <code·class="inline">encode/2</code>·and·<code·class="inline">decode/2</code>·in·module·<code·class="inline">People</code>,·which·is·called·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="7567077942-1">(</span><span·class="o">&lt;</span><span·class="n">Type</span><span·class="w">·</span><span·class="ss">name</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Value</spa[·...·truncated·by·diffoscope;·len:·604,·SHA:·f1ff5e904d91b465842d0b16c4e5c9d4c127eef6ccc38c2b1be1de875d9dff3e·...·]-1">)</span></code></pre><p>Assume·that·there·is·a·network·application·that·receives·instances·of·the·ASN.1155 <code·class="inline">encode/2</code>·and·<code·class="inline">decode/2</code>·in·module·<code·class="inline">People</code>,·which·is·called·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="5127526907-1">(</span><span·class="o">&lt;</span><span·class="n">Type</span><span·class="w">·</span><span·class="ss">name</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="n">Value</spa[·...·truncated·by·diffoscope;·len:·604,·SHA:·812e6391ee0ec98d6ff2c279c63e621812192ea1367166212e5b870ca5317df8·...·]-1">)</span></code></pre><p>Assume·that·there·is·a·network·application·that·receives·instances·of·the·ASN.1
156 defined·type·<code·class="inline">Person</code>,·modifies,·and·sends·them·back·again:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">receive</span><span·class="w">156 defined·type·<code·class="inline">Person</code>,·modifies,·and·sends·them·back·again:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">receive</span><span·class="w">
157 ···</span><span·class="p"·data-group-id="7676152129-1">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="p"·data-group-id="7676152129-2">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="7676152129-2">}</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·d28a0930915171f7a890c5099566df61fae5636ee9d66116c8201d667407cf7c·...·]-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 ···</span><span·class="p"·data-group-id="1715497276-1">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="p"·data-group-id="1715497276-2">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="1715497276-2">}</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·f79ab05b18c4149b7bdb67b3c8f3e21c73f6de32aa3f68550cc6e0bb101a406c·...·]-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ·······</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="7676152129-3">(</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="7676152129-3">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">158 ·······</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="1715497276-3">(</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="1715497276-3">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
159 ···········</span><span·class="p"·data-group-id="7676152129-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">P</span><span·class="p"·data-group-id="7676152129-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 ···········</span><span·class="p"·data-group-id="1715497276-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">P</span><span·class="p"·data-group-id="1715497276-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ···············</span><span·class="p"·data-group-id="7676152129-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Answer</span><span·class="p"·data-group-id="7676152129-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#[·...·truncated·by·diffoscope;·len:·385,·SHA:·590dff433cf77649892d0d12d64efc671c05e20d664c50da3c80ca984af4702c·...·]-6">)</span><span·class="p">,</span><span·class="w">160 ···············</span><span·class="p"·data-group-id="1715497276-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Answer</span><span·class="p"·data-group-id="1715497276-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#[·...·truncated·by·diffoscope;·len:·385,·SHA:·e99e2685b66f8d38d863dcddba7c742dbb037b689f2bc3ce216dd6b980440f32·...·]-6">)</span><span·class="p">,</span><span·class="w">
161 ···············</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7676152129-8">{</span><span·class="nf">self</span><span·class="p"·data-group-id="7676152129-9">(</span><span·class="p"·data-group-id="7676152129-9">)</span><span·class="p">,</span><span·class="p"·data-group-id="7676152129-10">{</span><span·class="ss">comma[·...·truncated·by·diffoscope;·len:·157,·SHA:·cd8ac2bd1cbf221bc438c5c9aa9dd66270acd59557eb291b09f49a78d6408186·...·]-8">}</span><span·class="p">;</span><span·class="w">161 ···············</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1715497276-8">{</span><span·class="nf">self</span><span·class="p"·data-group-id="1715497276-9">(</span><span·class="p"·data-group-id="1715497276-9">)</span><span·class="p">,</span><span·class="p"·data-group-id="1715497276-10">{</span><span·class="ss">comma[·...·truncated·by·diffoscope;·len:·157,·SHA:·5266e19b8e3d55754a6ddf2cb8ebf2dcbac6d8e2bf7f0751e7908b3d863a3748·...·]-8">}</span><span·class="p">;</span><span·class="w">
162 ···········</span><span·class="p"·data-group-id="7676152129-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="7676152129-11">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">162 ···········</span><span·class="p"·data-group-id="1715497276-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="1715497276-11">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
163 ···············</span><span·class="nf">exit</span><span·class="p"·data-group-id="7676152129-12">(</span><span·class="p"·data-group-id="7676152129-13">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="7676152129-13">}</span><span·class="p"·data-group-id="7676152129-12">)</span><span·class="w">163 ···············</span><span·class="nf">exit</span><span·class="p"·data-group-id="1715497276-12">(</span><span·class="p"·data-group-id="1715497276-13">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="1715497276-13">}</span><span·class="p"·data-group-id="1715497276-12">)</span><span·class="w">
164 ·······</span><span·class="k">end</span><span·class="w">164 ·······</span><span·class="k">end</span><span·class="w">
165 ····</span><span·class="k">end</span><span·class="p">,</span></code></pre><p>In·this·example,·a·series·of·bytes·is·received·from·an·external·source·and·the165 ····</span><span·class="k">end</span><span·class="p">,</span></code></pre><p>In·this·example,·a·series·of·bytes·is·received·from·an·external·source·and·the
166 bytes·are·then·decoded·into·a·valid·Erlang·term.·This·was·achieved·with·the·call166 bytes·are·then·decoded·into·a·valid·Erlang·term.·This·was·achieved·with·the·call
167 <code·class="inline">'People':decode('Person',Bytes)</code>,·which·returned·an·Erlang·value·of·the·ASN.1167 <code·class="inline">'People':decode('Person',Bytes)</code>,·which·returned·an·Erlang·value·of·the·ASN.1
168 type·<code·class="inline">Person</code>.·Then·an·answer·was·constructed·and·encoded·using168 type·<code·class="inline">Person</code>.·Then·an·answer·was·constructed·and·encoded·using
169 <code·class="inline">'People':encode('Person',Answer)</code>,·which·takes·an·instance·of·a·defined·ASN.1169 <code·class="inline">'People':encode('Person',Answer)</code>,·which·takes·an·instance·of·a·defined·ASN.1
170 type·and·transforms·it·to·a·binary·according·to·the·BER·or·PER·encoding·rules.</p><p>The·encoder·and·decoder·can·also·be·run·from·the·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">Rockstar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2887101944-1">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Some·Name&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·18,·SHA:·08594cdde5c88c6aba61f71268f3c28bd7c85589ff1f823de09c49beb7962b46·...·]4-1">}</span><span·class="p">.</span><span·class="w">170 type·and·transforms·it·to·a·binary·according·to·the·BER·or·PER·encoding·rules.</p><p>The·encoder·and·decoder·can·also·be·run·from·the·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">Rockstar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0494983424-1">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Some·Name&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·18,·SHA:·86d7e73fc3d9d071153821ce3dce91d52d4e4f710e48f49b5dfe2911122f6d0c·...·]4-1">}</span><span·class="p">.</span><span·class="w">
171 </span><span·class="p"·data-group-id="2887101944-2">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Some·Name&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·18,·SHA:·08594cdde5c88c6aba61f71268f3c28bd7c85589ff1f823de09c49beb7962b46·...·]4-2">}</span><span·class="gp·unselectable">171 </span><span·class="p"·data-group-id="0494983424-2">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Some·Name&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·18,·SHA:·86d7e73fc3d9d071153821ce3dce91d52d4e4f710e48f49b5dfe2911122f6d0c·...·]4-2">}</span><span·class="gp·unselectable">
172 3&gt;·</span><span·class="p"·data-group-id="2887101944-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Bin</span><span·class="p"·data-group-id="2887101944-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#39;[·...·truncated·by·diffoscope;·len:·249,·SHA:·763790db0bcc67d0007bcc8bb68a61bb9b1b4629c1c2b52d2414bf4cac10bbae·...·]4-4">)</span><span·class="p">.</span><span·class="w">172 3&gt;·</span><span·class="p"·data-group-id="0494983424-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Bin</span><span·class="p"·data-group-id="0494983424-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#39;[·...·truncated·by·diffoscope;·len:·249,·SHA:·de38d0fcaa11d177b8d0a3e75d8cf39c6ce359f9a25845b3abf991ff9fc1bbcf·...·]4-4">)</span><span·class="p">.</span><span·class="w">
173 </span><span·class="p"·data-group-id="2887101944-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2887101944-6">&lt;&lt;</span><span·class="mi">243</span><span·class="p">,</span><span·class="mi">17</span><span·class="p">,</span><span·class="mi">19</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">101</span><span·class="p">,</span><span·class="mi">32</span><span·class="p">,</span><span·class="mi">78</span><span·class="p">,</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">101</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">173 </span><span·class="p"·data-group-id="0494983424-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0494983424-6">&lt;&lt;</span><span·class="mi">243</span><span·class="p">,</span><span·class="mi">17</span><span·class="p">,</span><span·class="mi">19</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">101</span><span·class="p">,</span><span·class="mi">32</span><span·class="p">,</span><span·class="mi">78</span><span·class="p">,</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">101</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
174 ······</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·data-group-id="2887101944-6">&gt;&gt;</span><span·class="p"·data-group-id="2887101944-5">}</span><span·class="gp·unselectable">174 ······</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·data-group-id="0494983424-6">&gt;&gt;</span><span·class="p"·data-group-id="0494983424-5">}</span><span·class="gp·unselectable">
175 4&gt;·</span><span·class="p"·data-group-id="2887101944-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Person</span><span·class="p"·data-group-id="2887101944-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#[·...·truncated·by·diffoscope;·len:·247,·SHA:·d61c3a747f7a05a7996ccd2b44d433bce6a1e1307869e11e659075cc63a5e449·...·]4-8">)</span><span·class="p">.</span><span·class="w">175 4&gt;·</span><span·class="p"·data-group-id="0494983424-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Person</span><span·class="p"·data-group-id="0494983424-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#[·...·truncated·by·diffoscope;·len:·247,·SHA:·99cf10cd5ff41e26003a0ab6896daeba7b5a58fb86c6f55326e5bf878ac7cb82·...·]4-8">)</span><span·class="p">.</span><span·class="w">
176 </span><span·class="p"·data-group-id="2887101944-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2887101944-10">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Some·Name&quot;</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·176,·SHA:·584faaa1a55b73ef2de70807999fc699099b54bdf2f12ead01866219fece22b3·...·]4-9">}</span></code></pre><h3·id="module-dependencies"·class="section-heading">176 </span><span·class="p"·data-group-id="0494983424-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0494983424-10">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Some·Name&quot;</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·176,·SHA:·42cbacbbd9034796dae0298953e655e2875c0c1dd5df0b4729e78b7ab7585803·...·]4-9">}</span></code></pre><h3·id="module-dependencies"·class="section-heading">
177 ··<a·href="#module-dependencies"·class="hover-link">177 ··<a·href="#module-dependencies"·class="hover-link">
178 ····<i·class="ri-link-m"·aria-hidden="true"></i>178 ····<i·class="ri-link-m"·aria-hidden="true"></i>
179 ··</a>179 ··</a>
180 ··<span·class="text">Module·Dependencies</span>180 ··<span·class="text">Module·Dependencies</span>
181 </h3>181 </h3>
182 <p>It·is·common·that·ASN.1·modules·import·defined·types,·values,·and·other·entities182 <p>It·is·common·that·ASN.1·modules·import·defined·types,·values,·and·other·entities
183 from·another·ASN.1·module.</p><p>Earlier·versions·of·the·ASN.1·compiler·required·that·modules·that·were·imported183 from·another·ASN.1·module.</p><p>Earlier·versions·of·the·ASN.1·compiler·required·that·modules·that·were·imported
Offset 240, 24 lines modifiedOffset 240, 24 lines modified
240 ··<a·href="#special-decode-functionality-for-json-encoding-rules-jer"·class="hover-link">240 ··<a·href="#special-decode-functionality-for-json-encoding-rules-jer"·class="hover-link">
241 ····<i·class="ri-link-m"·aria-hidden="true"></i>241 ····<i·class="ri-link-m"·aria-hidden="true"></i>
242 ··</a>242 ··</a>
243 ··<span·class="text">Special·Decode·Functionality·for·JSON·Encoding·Rules·(JER)</span>243 ··<span·class="text">Special·Decode·Functionality·for·JSON·Encoding·Rules·(JER)</span>
244 </h3>244 </h3>
245 <p>When·using·the·JSON·encoding·rules,·it·is·possible·to·call·the245 <p>When·using·the·JSON·encoding·rules,·it·is·possible·to·call·the
246 <code·class="inline">decode/2</code>·function·in·the·following·way·with·data·that·has·already246 <code·class="inline">decode/2</code>·function·in·the·following·way·with·data·that·has·already
247 been·decoded·by·<a·href="../../../../lib/stdlib-6.2.2/doc/html/json.html#decode/1"><code·class="inline">json:decode/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">SomeModule</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="1765190375-1">(</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1765190375-2">{</span><span·class="ss">json_decoded</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Decode[·...·truncated·by·diffoscope;·len:·658,·SHA:·8b8983e03f5fa5e2be06329991bfb8f63154c3b6870ac7dfb24c7e162d49ed3a·...·]-1">)</span><span·class="p">.</span><span·class="w">247 been·decoded·by·<a·href="../../../../lib/stdlib-6.2.2/doc/html/json.html#decode/1"><code·class="inline">json:decode/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">SomeModule</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="9541842431-1">(</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9541842431-2">{</span><span·class="ss">json_decoded</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Decode[·...·truncated·by·diffoscope;·len:·658,·SHA:·9769c9a93ccb2a82d5ca82a3b56a7514d21c6b2f82bf37f9838b6f881b88c296·...·]-1">)</span><span·class="p">.</span><span·class="w">
248 </span><span·class="ss">ok</span><span·class="gp·unselectable">248 </span><span·class="ss">ok</span><span·class="gp·unselectable">
249 2&gt;·</span><span·class="n">Rockstar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4506108693-3">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·b94b1fe95dfd698a5a6285960d989cbe5f1133949dadcea2c3e266b6aae6bbcf·...·]-3">}</span><span·class="p">.</span><span·class="w">249 2&gt;·</span><span·class="n">Rockstar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2273701400-3">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·acb3d71fa4286cd06d7c3eca33e7cf30a3388f92b75d27feda79b87a681558b6·...·]-3">}</span><span·class="p">.</span><span·class="w">
250 </span><span·class="p"·data-group-id="4506108693-4">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·b94b1fe95dfd698a5a6285960d989cbe5f1133949dadcea2c3e266b6aae6bbcf·...·]-4">}</span><span·class="gp·unselectable">250 </span><span·class="p"·data-group-id="2273701400-4">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,</span><span·class="ss">roving</span><span·class="p">,</span><span·class="mi">50</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·acb3d71fa4286cd06d7c3eca33e7cf30a3388f92b75d27feda79b87a681558b6·...·]-4">}</span><span·class="gp·unselectable">
251 3&gt;·</span><span·class="p"·data-group-id="4506108693-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Bin</span><span·class="p"·data-group-id="4506108693-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#39;[·...·truncated·by·diffoscope;·len:·274,·SHA:·e0012c52ef56c50a3650a2e5f2fc989e383dc1b6c473d8936b3c423bf4f709e2·...·]-6">)</span><span·class="p">.</span><span·class="w">251 3&gt;·</span><span·class="p"·data-group-id="2273701400-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Bin</span><span·class="p"·data-group-id="2273701400-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;People&#39;[·...·truncated·by·diffoscope;·len:·274,·SHA:·354bc4e68fef1c4ef01d4e97f2902aeea2022b7a0c11e4230245cd97a7043d96·...·]-6">)</span><span·class="p">.</span><span·class="w">
252 </span><span·class="p"·data-group-id="4506108693-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4506108693-8">&lt;&lt;</span><span·class="s">&quot;{\&quot;name\&quot;:\&quot;Vince·Eclipse\&quot;,\&quot;location\&quot;:2,\&quot;age\&quot;:50}&quot;</[·...·truncated·by·diffoscope;·len:·106,·SHA:·5d86cbc1d7fb8a321ca23eeb2d9514f5eb57a17e965f74ab86dba6aab0f5442c·...·]-7">}</span><span·class="gp·unselectable">252 </span><span·class="p"·data-group-id="2273701400-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2273701400-8">&lt;&lt;</span><span·class="s">&quot;{\&quot;name\&quot;:\&quot;Vince·Eclipse\&quot;,\&quot;location\&quot;:2,\&quot;age\&quot;:50}&quot;</[·...·truncated·by·diffoscope;·len:·106,·SHA:·95ebd06ed553d1a83839bf924328b589774306ef98aeb602aefc9cd44921bba2·...·]-7">}</span><span·class="gp·unselectable">
253 4&gt;·</span><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="4506108693-9">(</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="4506108693-9">)</span><span·class="p">.</span><span·class="w">253 4&gt;·</span><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="2273701400-9">(</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="2273701400-9">)</span><span·class="p">.</span><span·class="w">
254 </span><span·class="p"·data-group-id="4506108693-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4506108693-11">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·182,·SHA:·a1ad1d8f350a4052703eeeb5b9f90b509232d484342af9605e8e71c7377d5fc9·...·]-10">}</span><span·class="gp·unselectable">254 </span><span·class="p"·data-group-id="2273701400-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2273701400-11">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·182,·SHA:·23cfe6ce180412a7932b41a7479710166d0b7796372dfec151229db5e2a34934·...·]-10">}</span><span·class="gp·unselectable">
255 5&gt;·</span><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="4506108693-12">(</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4506108693-13">{</span><span·class="ss">json_decoded</span><span·class="p">,</span><span·class="nc">json</span><sp[·...·truncated·by·diffoscope;·len:·280,·SHA:·775a65f8f5cf093f17e0cf1ebdc7521d5248bee77b55337500328b401a62d843·...·]-12">)</span><span·class="p">.</span><span·class="w">255 5&gt;·</span><span·class="nc">&#39;People&#39;</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="2273701400-12">(</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2273701400-13">{</span><span·class="ss">json_decoded</span><span·class="p">,</span><span·class="nc">json</span><sp[·...·truncated·by·diffoscope;·len:·280,·SHA:·817e7680793aaa2ec3eec9a5afdf5087fdfaf4d09ee2fc99a3367aec7caf20c4·...·]-12">)</span><span·class="p">.</span><span·class="w">
256 </span><span·class="p"·data-group-id="4506108693-15">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4506108693-16">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·182,·SHA:·93f6291ee5db4a426a4ed88434ddb4257fbdaffc000d54a439fa41ee28266875·...·]-15">}</span><span·class="w">256 </span><span·class="p"·data-group-id="2273701400-15">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2273701400-16">{</span><span·class="ss">&#39;Person&#39;</span><span·class="p">,</span><span·class="s">&quot;Vince·Eclipse&quot;</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·182,·SHA:·00e3d3dfa7b04615e22970466206ed55b2c4a2452c97b73b55efc8485d485877·...·]-15">}</span><span·class="w">
257 </span></code></pre><h3·id="errors"·class="section-heading">257 </span></code></pre><h3·id="errors"·class="section-heading">
258 ··<a·href="#errors"·class="hover-link">258 ··<a·href="#errors"·class="hover-link">
259 ····<i·class="ri-link-m"·aria-hidden="true"></i>259 ····<i·class="ri-link-m"·aria-hidden="true"></i>
260 ··</a>260 ··</a>
261 ··<span·class="text">Errors</span>261 ··<span·class="text">Errors</span>
262 </h3>262 </h3>
263 <p>Errors·detected·at·compile-time·are·displayed·on·the·screen·together·with·line263 <p>Errors·detected·at·compile-time·are·displayed·on·the·screen·together·with·line
Offset 285, 35 lines modifiedOffset 285, 35 lines modified
285 ··</a>285 ··</a>
286 ··<span·class="text">Note·about·tags</span>286 ··<span·class="text">Note·about·tags</span>
287 </h2>287 </h2>
288 <p>Tags·used·to·be·important·for·all·users·of·ASN.1,·because·it·was·necessary·to288 <p>Tags·used·to·be·important·for·all·users·of·ASN.1,·because·it·was·necessary·to
289 to·manually·add·tags·to·certain·constructs·in·order·for·the·ASN.1·specification·to289 to·manually·add·tags·to·certain·constructs·in·order·for·the·ASN.1·specification·to
290 be·valid.·Example·of·an·old-style·specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tags</span><span·class="w">·</span><span·class="n">DEFINITIONS</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">290 be·valid.·Example·of·an·old-style·specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tags</span><span·class="w">·</span><span·class="n">DEFINITIONS</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">
291 </span><span·class="n">BEGIN</span><span·class="w">291 </span><span·class="n">BEGIN</span><span·class="w">
292 ··</span><span·class="n">Afters</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">CHOICE</span><span·class="w">·</span><span·class="p"·data-group-id="6681895048-1">{</span><span·class="w">·</span><span·class="ss">cheese</span><span·class="w">·</span><span·class="p"·data-group-id="6681895048-2">[</span><span·class="mi">0</span><span·class="p"·data-group-id="6681895048-2">]</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="p">,</span><span·class="w">292 ··</span><span·class="n">Afters</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">CHOICE</span><span·class="w">·</span><span·class="p"·data-group-id="5333447674-1">{</span><span·class="w">·</span><span·class="ss">cheese</span><span·class="w">·</span><span·class="p"·data-group-id="5333447674-2">[</span><span·class="mi">0</span><span·class="p"·data-group-id="5333447674-2">]</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="p">,</span><span·class="w">
293 ······················</span><span·class="ss">dessert</span><span·class="w">·</span><span·class="p"·data-group-id="6681895048-3">[</span><span·class="mi">1</span><span·class="p"·data-group-id="6681895048-3">]</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="w">·</span><span·class="p"·data-group-id="6681895048-1">}</span><span·class="w">293 ······················</span><span·class="ss">dessert</span><span·class="w">·</span><span·class="p"·data-group-id="5333447674-3">[</span><span·class="mi">1</span><span·class="p"·data-group-id="5333447674-3">]</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="w">·</span><span·class="p"·data-group-id="5333447674-1">}</span><span·class="w">
294 </span><span·class="n">END</span></code></pre><p>Without·the·tags·(the·numbers·in·square·brackets)·the·ASN.1·compiler·refused·to294 </span><span·class="n">END</span></code></pre><p>Without·the·tags·(the·numbers·in·square·brackets)·the·ASN.1·compiler·refused·to
295 compile·the·file.</p><p>In·1994·the·global·tagging·mode·<code·class="inline">AUTOMATIC·TAGS</code>·was·introduced.·By·putting295 compile·the·file.</p><p>In·1994·the·global·tagging·mode·<code·class="inline">AUTOMATIC·TAGS</code>·was·introduced.·By·putting
296 <code·class="inline">AUTOMATIC·TAGS</code>·in·the·module·header,·the·ASN.1·compiler·automatically·adds296 <code·class="inline">AUTOMATIC·TAGS</code>·in·the·module·header,·the·ASN.1·compiler·automatically·adds
297 tags·when·needed.·The·following·is·the·same·specification·in·<code·class="inline">AUTOMATIC·TAGS</code>297 tags·when·needed.·The·following·is·the·same·specification·in·<code·class="inline">AUTOMATIC·TAGS</code>
298 mode:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tags</span><span·class="w">·</span><span·class="n">DEFINITIONS</span><span·class="w">·</span><span·class="n">AUTOMATIC</span><span·class="w">·</span><span·class="n">TAGS</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">298 mode:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tags</span><span·class="w">·</span><span·class="n">DEFINITIONS</span><span·class="w">·</span><span·class="n">AUTOMATIC</span><span·class="w">·</span><span·class="n">TAGS</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">
299 </span><span·class="n">BEGIN</span><span·class="w">299 </span><span·class="n">BEGIN</span><span·class="w">
300 ··</span><span·class="n">Afters</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">CHOICE</span><span·class="w">·</span><span·class="p"·data-group-id="1645149468-1">{</span><span·class="w">·</span><span·class="ss">cheese</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="p">,</span><span·class="w">300 ··</span><span·class="n">Afters</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">CHOICE</span><span·class="w">·</span><span·class="p"·data-group-id="0847914615-1">{</span><span·class="w">·</span><span·class="ss">cheese</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="p">,</span><span·class="w">
301 ······················</span><span·class="ss">dessert</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="w">·</span><span·class="p"·data-group-id="1645149468-1">}</span><span·class="w">301 ······················</span><span·class="ss">dessert</span><span·class="w">·</span><span·class="n">IA5String</span><span·class="w">·</span><span·class="p"·data-group-id="0847914615-1">}</span><span·class="w">
302 </span><span·class="n">END</span></code></pre><p><a·href=""·id="ASN1Types"></a></p><h2·id="asn-1-types"·class="section-heading">302 </span><span·class="n">END</span></code></pre><p><a·href=""·id="ASN1Types"></a></p><h2·id="asn-1-types"·class="section-heading">
303 ··<a·href="#asn-1-types"·class="hover-link">303 ··<a·href="#asn-1-types"·class="hover-link">
304 ····<i·class="ri-link-m"·aria-hidden="true"></i>304 ····<i·class="ri-link-m"·aria-hidden="true"></i>
305 ··</a>305 ··</a>
306 ··<span·class="text">ASN.1·Types</span>306 ··<span·class="text">ASN.1·Types</span>
307 </h2>307 </h2>
308 <p>This·section·describes·the·ASN.1·types·including·their·functionality,·purpose,308 <p>This·section·describes·the·ASN.1·types·including·their·functionality,·purpose,
309 and·how·values·are·assigned·in·Erlang.</p><p>ASN.1·has·both·primitive·and·constructed·types:</p><table><thead><tr><th·style="text-align:·left;"><em>Primitive·Types</em></th><th·style="text-align:·left;"><em>Constructed·Types</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#boolean">BOOLEAN</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#sequence">SEQUENCE</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#integer">INTEGER</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#set">SET</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#real">REAL</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#choice">CHOICE</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#null">NULL</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#SOF">SET·OF·and·SEQUENCE·OF</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#enumerated">ENUMERATED</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#ANY">ANY</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#bit-string">BIT·STRING</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#ANY">ANY·DEFINED·BY</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#octet-string">OCTET·STRING</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#NegotiationTypes">EXTERNAL</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#character-strings">Character·Strings</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#NegotiationTypes">EMBEDDED·PDV</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#object-identifier">OBJECT·IDENTIFIER</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#NegotiationTypes">CHARACTER·STRING</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#object-descriptor">Object·Descriptor</a></td><td·style="text-align:·left;"></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#The-TIME-types">TIME·Types</a></td><td·style="text-align:·left;"></td></tr></tbody></table><p><em>Table:·Supported·ASN.1·Types</em></p><p><a·href=""·id="TypeNameValue"></a></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·values·of·each·ASN.1·type·have·their·own·representation·in·Erlang,·as309 and·how·values·are·assigned·in·Erlang.</p><p>ASN.1·has·both·primitive·and·constructed·types:</p><table><thead><tr><th·style="text-align:·left;"><em>Primitive·Types</em></th><th·style="text-align:·left;"><em>Constructed·Types</em></th></tr></thead><tbody><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#boolean">BOOLEAN</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#sequence">SEQUENCE</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#integer">INTEGER</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#set">SET</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#real">REAL</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#choice">CHOICE</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#null">NULL</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#SOF">SET·OF·and·SEQUENCE·OF</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#enumerated">ENUMERATED</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#ANY">ANY</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#bit-string">BIT·STRING</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#ANY">ANY·DEFINED·BY</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#octet-string">OCTET·STRING</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#NegotiationTypes">EXTERNAL</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#character-strings">Character·Strings</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#NegotiationTypes">EMBEDDED·PDV</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#object-identifier">OBJECT·IDENTIFIER</a></td><td·style="text-align:·left;"><a·href="asn1_getting_started.html#NegotiationTypes">CHARACTER·STRING</a></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#object-descriptor">Object·Descriptor</a></td><td·style="text-align:·left;"></td></tr><tr><td·style="text-align:·left;"><a·href="asn1_getting_started.html#The-TIME-types">TIME·Types</a></td><td·style="text-align:·left;"></td></tr></tbody></table><p><em>Table:·Supported·ASN.1·Types</em></p><p><a·href=""·id="TypeNameValue"></a></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·values·of·each·ASN.1·type·have·their·own·representation·in·Erlang,·as
310 described·in·the·following·sections.·Users·must·provide·these·values·for310 described·in·the·following·sections.·Users·must·provide·these·values·for
311 encoding·according·to·the·representation,·as·shown·in·the·following·example:</p></section><pre><code·class="text">Operational·::=·BOOLEAN·--ASN.1·definition</code></pre><p>In·Erlang·code·it·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">311 encoding·according·to·the·representation,·as·shown·in·the·following·example:</p></section><pre><code·class="text">Operational·::=·BOOLEAN·--ASN.1·definition</code></pre><p>In·Erlang·code·it·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">
312 </span><span·class="p"·data-group-id="5607790489-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="5607790489-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">MyModule</span><[·...·truncated·by·diffoscope;·len:·266,·SHA:·63ed12d73172c4d5d61b2578936c93eeb4b08593fa9a8d1373291fb45b5a8aea·...·]-2">)</span><span·class="p">,</span></code></pre><h3·id="boolean"·class="section-heading">312 </span><span·class="p"·data-group-id="5559339924-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Bytes</span><span·class="p"·data-group-id="5559339924-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">MyModule</span><[·...·truncated·by·diffoscope;·len:·266,·SHA:·b38419c7264e3bc01372bae5d4ec7cc9779da41b9636a025702510e26cb48208·...·]-2">)</span><span·class="p">,</span></code></pre><h3·id="boolean"·class="section-heading">
313 ··<a·href="#boolean"·class="hover-link">313 ··<a·href="#boolean"·class="hover-link">
314 ····<i·class="ri-link-m"·aria-hidden="true"></i>314 ····<i·class="ri-link-m"·aria-hidden="true"></i>
315 ··</a>315 ··</a>
316 ··<span·class="text">BOOLEAN</span>316 ··<span·class="text">BOOLEAN</span>
317 </h3>317 </h3>
318 <p>Booleans·in·ASN.1·express·values·that·can·be·either·<code·class="inline">TRUE</code>·or·<code·class="inline">FALSE</code>.·The318 <p>Booleans·in·ASN.1·express·values·that·can·be·either·<code·class="inline">TRUE</code>·or·<code·class="inline">FALSE</code>.·The
319 meanings·assigned·to·<code·class="inline">TRUE</code>·and·<code·class="inline">FALSE</code>·are·outside·the·scope·of·this·text.</p><p>In·ASN.1·it·is·possible·to·have:</p><pre><code·class="text">Operational·::=·BOOLEAN</code></pre><p>Assigning·a·value·to·type·<code·class="inline">Operational</code>·in·Erlang·is·possible·by·using·the319 meanings·assigned·to·<code·class="inline">TRUE</code>·and·<code·class="inline">FALSE</code>·are·outside·the·scope·of·this·text.</p><p>In·ASN.1·it·is·possible·to·have:</p><pre><code·class="text">Operational·::=·BOOLEAN</code></pre><p>Assigning·a·value·to·type·<code·class="inline">Operational</code>·in·Erlang·is·possible·by·using·the
Offset 322, 19 lines modifiedOffset 322, 19 lines modified
322 ····<i·class="ri-link-m"·aria-hidden="true"></i>322 ····<i·class="ri-link-m"·aria-hidden="true"></i>
323 ··</a>323 ··</a>
324 ··<span·class="text">INTEGER</span>324 ··<span·class="text">INTEGER</span>
325 </h3>325 </h3>
326 <p>An·ASN.1·INTEGER·is·represented·by·an·integer·in·Erlang.</p><p>The·concept·of·subtyping·can·be·applied·to·integers·and·to·other·ASN.1·types.326 <p>An·ASN.1·INTEGER·is·represented·by·an·integer·in·Erlang.</p><p>The·concept·of·subtyping·can·be·applied·to·integers·and·to·other·ASN.1·types.
327 The·details·of·subtyping·are·not·explained·here;·for·more·information,·see327 The·details·of·subtyping·are·not·explained·here;·for·more·information,·see
328 X.680.·Various·syntaxes·are·allowed·when·defining·a·type·as·an·integer:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">328 X.680.·Various·syntaxes·are·allowed·when·defining·a·type·as·an·integer:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">
329 </span><span·class="n">T2</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="5897110825-1">(</span><span·class="o">-</span><span·class="mi">2</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">7</span><span·class="p"·data-group-id="5897110825-1">)</span><span·class="w">329 </span><span·class="n">T2</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="8285738625-1">(</span><span·class="o">-</span><span·class="mi">2</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">7</span><span·class="p"·data-group-id="8285738625-1">)</span><span·class="w">
330 </span><span·class="n">T3</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="5897110825-2">(</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="n">MAX</span><span·class="p"·data-group-id="5897110825-2">)</span><span·class="w">330 </span><span·class="n">T3</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="8285738625-2">(</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="n">MAX</span><span·class="p"·data-group-id="8285738625-2">)</span><span·class="w">
331 </span><span·class="n">T4</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="5897110825-3">(</span><span·class="mi">0</span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="n">MAX</span><span·class="p"·data-group-id="5897110825-3">)</span><span·class="w">331 </span><span·class="n">T4</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="8285738625-3">(</span><span·class="mi">0</span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="n">MAX</span><span·class="p"·data-group-id="8285738625-3">)</span><span·class="w">
332 </span><span·class="n">T5</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="5897110825-4">(</span><span·class="n">MIN</span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="o">-</span><span·class="mi">99</span><span·class="p"·data-group-id="5897110825-4">)</span><span·class="w">332 </span><span·class="n">T5</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="8285738625-4">(</span><span·class="n">MIN</span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="o">-</span><span·class="mi">99</span><span·class="p"·data-group-id="8285738625-4">)</span><span·class="w">
333 </span><span·class="n">T6</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="5897110825-5">{</span><span·class="nf">red</span><span·class="p"·data-group-id="5897110825-6">(</span><span·class="mi">0</span><span·class="p"·data-group-id="5897110825-6">)</span><span·class="p">,</span><span·class="nf">blue</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·330,·SHA:·c4c89a524971f3a89e9cc6ec946efafde17fe488e24e6af240c477e3e6e12081·...·]25-5">}</span></code></pre><p>The·Erlang·representation·of·an·ASN.1·<code·class="inline">INTEGER</code>·is·an·integer·or·an·atom·if·a333 </span><span·class="n">T6</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">INTEGER</span><span·class="w">·</span><span·class="p"·data-group-id="8285738625-5">{</span><span·class="nf">red</span><span·class="p"·data-group-id="8285738625-6">(</span><span·class="mi">0</span><span·class="p"·data-group-id="8285738625-6">)</span><span·class="p">,</span><span·class="nf">blue</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·330,·SHA:·5e62b6ab87a4e3b6272cc2e7361b4ee71487e4fcb990267441cd0553ca962f41·...·]25-5">}</span></code></pre><p>The·Erlang·representation·of·an·ASN.1·<code·class="inline">INTEGER</code>·is·an·integer·or·an·atom·if·a
334 <code·class="inline">Named·Number·List</code>·(see·<code·class="inline">T6</code>·in·the·previous·list)·is·specified.</p><p>The·following·is·an·example·of·Erlang·code·that·assigns·values·for·the·types·in334 <code·class="inline">Named·Number·List</code>·(see·<code·class="inline">T6</code>·in·the·previous·list)·is·specified.</p><p>The·following·is·an·example·of·Erlang·code·that·assigns·values·for·the·types·in
335 the·previous·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T1value</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">335 the·previous·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T1value</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
336 </span><span·class="n">T2value</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">336 </span><span·class="n">T2value</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">
337 </span><span·class="n">T6value1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">blue</span><span·class="p">,</span><span·class="w">337 </span><span·class="n">T6value1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">blue</span><span·class="p">,</span><span·class="w">
338 </span><span·class="n">T6value2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">338 </span><span·class="n">T6value2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
339 </span><span·class="n">T6value3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">white</span></code></pre><p>These·Erlang·variables·are·now·bound·to·valid·instances·of·ASN.1·defined·types.339 </span><span·class="n">T6value3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">white</span></code></pre><p>These·Erlang·variables·are·now·bound·to·valid·instances·of·ASN.1·defined·types.
340 This·style·of·value·can·be·passed·directly·to·the·encoder·for·transformation340 This·style·of·value·can·be·passed·directly·to·the·encoder·for·transformation
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199 ······<p·class="built-using">199 ······<p·class="built-using">
200 ········Built·using200 ········Built·using
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202 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>202 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
203 ······</p>203 ······</p>
204 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>204 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
190 ······</p>190 ······</p>
191 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>191 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
192 ····</footer>192 ····</footer>
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161 </h3>161 </h3>
162 <p>The·runtime·user·interface·for·exclusive·decode·comprises·the·following·two162 <p>The·runtime·user·interface·for·exclusive·decode·comprises·the·following·two
163 functions:</p><ul><li>A·function·for·an·exclusive·decode,·whose·name·the·user·decides·in·the163 functions:</p><ul><li>A·function·for·an·exclusive·decode,·whose·name·the·user·decides·in·the
164 configuration·file</li><li>A·<code·class="inline">decode_part/2</code>·function·generated·by·the·ASN.1·compiler·when164 configuration·file</li><li>A·<code·class="inline">decode_part/2</code>·function·generated·by·the·ASN.1·compiler·when
165 exclusive·decode·is·enabled.·This·function·decodes·the·parts·that165 exclusive·decode·is·enabled.·This·function·decodes·the·parts·that
166 were·left·undecoded·during·the·exclusive·decode.</li></ul><p>Both·functions·are·described·in·the·following.</p><p>If·the·exclusive·decode·function·has,·for·example,·the·name·<code·class="inline">decode_exclusive</code>166 were·left·undecoded·during·the·exclusive·decode.</li></ul><p>Both·functions·are·described·in·the·following.</p><p>If·the·exclusive·decode·function·has,·for·example,·the·name·<code·class="inline">decode_exclusive</code>
167 and·an·ASN.1·encoded·message·<code·class="inline">Bin</code>·is·to·be·exclusive·decoded,·the·call·is·as167 and·an·ASN.1·encoded·message·<code·class="inline">Bin</code>·is·to·be·exclusive·decoded,·the·call·is·as
168 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7784826053-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">ExclMessage</span><span·class="p"·data-group-id="7784826053-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;MyMo[·...·truncated·by·diffoscope;·len:·200,·SHA:·19927c57777c3014cbfaf9a3867b389d33939008bb82fda2d82f51244577f35c·...·]-2">)</span></code></pre><p><a·href=""·id="UndecodedPart"></a>·The·result·<code·class="inline">ExclMessage</code>·has·the·same·structure·as·a168 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7320389011-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">ExclMessage</span><span·class="p"·data-group-id="7320389011-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;MyMo[·...·truncated·by·diffoscope;·len:·200,·SHA:·f3bff6ac05ba5557f7504eb5baa99bf21b99abf99bdc935599565d3ad475aec6·...·]-2">)</span></code></pre><p><a·href=""·id="UndecodedPart"></a>·The·result·<code·class="inline">ExclMessage</code>·has·the·same·structure·as·a
169 complete·decode·would·have,·except·for·the·parts·of·the·top·type·that·were·not169 complete·decode·would·have,·except·for·the·parts·of·the·top·type·that·were·not
170 decoded.·The·undecoded·parts·are·on·their·places·in·the·structure·on·format170 decoded.·The·undecoded·parts·are·on·their·places·in·the·structure·on·format
171 <code·class="inline">{TypeKey,UndecodedValue}</code>.</p><p>Each·undecoded·part·that·is·to·be·decoded·must·be·fed·into·function171 <code·class="inline">{TypeKey,UndecodedValue}</code>.</p><p>Each·undecoded·part·that·is·to·be·decoded·must·be·fed·into·function
172 <code·class="inline">decode_part/2</code>·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3830571529-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">PartMessage</span><span·class="p"·data-group-id="3830571529-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;MyM[·...·truncated·by·diffoscope;·len:·285,·SHA:·1737cc00950778295a3185b0a21155de026cd67e260f604f97a4838d2de90a05·...·]-2">)</span></code></pre><p><a·href=""·id="Exclusive-Instruction"></a></p><h3·id="writing-an-exclusive-decode-instruction"·class="section-heading">172 <code·class="inline">decode_part/2</code>·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6680330667-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">PartMessage</span><span·class="p"·data-group-id="6680330667-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;MyM[·...·truncated·by·diffoscope;·len:·285,·SHA:·115818b4db89919e09da4bd14f9d7cf03a13c4e2a582d1c3dece30c51e445126·...·]-2">)</span></code></pre><p><a·href=""·id="Exclusive-Instruction"></a></p><h3·id="writing-an-exclusive-decode-instruction"·class="section-heading">
173 ··<a·href="#writing-an-exclusive-decode-instruction"·class="hover-link">173 ··<a·href="#writing-an-exclusive-decode-instruction"·class="hover-link">
174 ····<i·class="ri-link-m"·aria-hidden="true"></i>174 ····<i·class="ri-link-m"·aria-hidden="true"></i>
175 ··</a>175 ··</a>
176 ··<span·class="text">Writing·an·Exclusive·Decode·Instruction</span>176 ··<span·class="text">Writing·an·Exclusive·Decode·Instruction</span>
177 </h3>177 </h3>
178 <p>This·instruction·is·written·in·the·configuration·file·in·the·following·format:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ExclusiveDecodeInstruction</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0590819752-1">{</span><span·class="ss">exclusive_decode</span><span·class="p">,</span><span·class="p"·data-group-id="0590819752-2">{</span><span·class="n">ModuleName</span><span·class="p">,</span><span·class="n">DecodeInstructions</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·75,·SHA:·1f6377b7875c723920fb014f6031fe0196dc26b8a1b39ab560a8bb1cc9368b8b·...·]-1">}</span><span·class="p">.</span><span·class="w">178 <p>This·instruction·is·written·in·the·configuration·file·in·the·following·format:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ExclusiveDecodeInstruction</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6640584778-1">{</span><span·class="ss">exclusive_decode</span><span·class="p">,</span><span·class="p"·data-group-id="6640584778-2">{</span><span·class="n">ModuleName</span><span·class="p">,</span><span·class="n">DecodeInstructions</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·75,·SHA:·cdde2ef1c305d734397493b68cf9effd0a859451e34d8ad53e94af795e04723e·...·]-1">}</span><span·class="p">.</span><span·class="w">
  
179 </span><span·class="n">ModuleName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0590819752-3">(</span><span·class="p"·data-group-id="0590819752-3">)</span><span·class="w">179 </span><span·class="n">ModuleName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6640584778-3">(</span><span·class="p"·data-group-id="6640584778-3">)</span><span·class="w">
  
180 </span><span·class="n">DecodeInstructions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0590819752-4">[</span><span·class="n">DecodeInstruction</span><span·class="p"·data-group-id="0590819752-4">]</span><span·class="o">+</span><span·class="w">180 </span><span·class="n">DecodeInstructions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6640584778-4">[</span><span·class="n">DecodeInstruction</span><span·class="p"·data-group-id="6640584778-4">]</span><span·class="o">+</span><span·class="w">
  
181 </span><span·class="n">DecodeInstruction</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0590819752-5">{</span><span·class="n">ExclusiveDecodeFunctionName</span><span·class="p">,</span><span·class="n">TypeList</span><span·class="p"·data-group-id="0590819752-5">}</span><span·class="w">181 </span><span·class="n">DecodeInstruction</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6640584778-5">{</span><span·class="n">ExclusiveDecodeFunctionName</span><span·class="p">,</span><span·class="n">TypeList</span><span·class="p"·data-group-id="6640584778-5">}</span><span·class="w">
  
182 </span><span·class="n">ExclusiveDecodeFunctionName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0590819752-6">(</span><span·class="p"·data-group-id="0590819752-6">)</span><span·class="w">182 </span><span·class="n">ExclusiveDecodeFunctionName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6640584778-6">(</span><span·class="p"·data-group-id="6640584778-6">)</span><span·class="w">
  
183 </span><span·class="n">TypeList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0590819752-7">[</span><span·class="n">TopType</span><span·class="p">,</span><span·class="n">ElementList</span><span·class="p"·data-group-id="0590819752-7">]</span><span·class="w">183 </span><span·class="n">TypeList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6640584778-7">[</span><span·class="n">TopType</span><span·class="p">,</span><span·class="n">ElementList</span><span·class="p"·data-group-id="6640584778-7">]</span><span·class="w">
  
184 </span><span·class="n">ElementList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0590819752-8">[</span><span·class="n">Element</span><span·class="p"·data-group-id="0590819752-8">]</span><span·class="o">+</span><span·class="w">184 </span><span·class="n">ElementList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6640584778-8">[</span><span·class="n">Element</span><span·class="p"·data-group-id="6640584778-8">]</span><span·class="o">+</span><span·class="w">
  
185 </span><span·class="n">Element</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0590819752-9">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="ss">parts</span><span·class="p"·data-group-id="0590819752-9">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">185 </span><span·class="n">Element</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6640584778-9">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="ss">parts</span><span·class="p"·data-group-id="6640584778-9">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
186 ··········</span><span·class="p"·data-group-id="0590819752-10">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="ss">undecoded</span><span·class="p"·data-group-id="0590819752-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">186 ··········</span><span·class="p"·data-group-id="6640584778-10">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="ss">undecoded</span><span·class="p"·data-group-id="6640584778-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
187 ··········</span><span·class="p"·data-group-id="0590819752-11">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="n">ElementList</span><span·class="p"·data-group-id="0590819752-11">}</span><span·class="w">187 ··········</span><span·class="p"·data-group-id="6640584778-11">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="n">ElementList</span><span·class="p"·data-group-id="6640584778-11">}</span><span·class="w">
  
188 </span><span·class="n">TopType</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0590819752-12">(</span><span·class="p"·data-group-id="0590819752-12">)</span><span·class="w">188 </span><span·class="n">TopType</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6640584778-12">(</span><span·class="p"·data-group-id="6640584778-12">)</span><span·class="w">
  
189 </span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0590819752-13">(</span><span·class="p"·data-group-id="0590819752-13">)</span></code></pre><p>The·instruction·must·be·a·valid·Erlang·term·terminated·by·a·dot.</p><p>In·<code·class="inline">TypeList</code>·the·path·from·the·top·type·to·each·undecoded·subcomponent·is189 </span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6640584778-13">(</span><span·class="p"·data-group-id="6640584778-13">)</span></code></pre><p>The·instruction·must·be·a·valid·Erlang·term·terminated·by·a·dot.</p><p>In·<code·class="inline">TypeList</code>·the·path·from·the·top·type·to·each·undecoded·subcomponent·is
190 described.·<code·class="inline">TopType</code>·is·the·name·of·a·top-level·type·in·the·ASN.1·specification.190 described.·<code·class="inline">TopType</code>·is·the·name·of·a·top-level·type·in·the·ASN.1·specification.
191 The·action·for·each·component·in·<code·class="inline">ElementList</code>·is·described·by·one·of:</p><ul><li><code·class="inline">{Name,parts}</code></li><li><code·class="inline">{Name,undecoded}</code></li><li><code·class="inline">{Name,ElementList}</code></li></ul><p>The·use·and·effect·of·the·actions·are·as·follows:</p><ul><li><p><strong><code·class="inline">{Name,undecoded}</code></strong>·-·Leaves·the·element·undecoded.·The·type·of·<code·class="inline">Name</code>·can191 The·action·for·each·component·in·<code·class="inline">ElementList</code>·is·described·by·one·of:</p><ul><li><code·class="inline">{Name,parts}</code></li><li><code·class="inline">{Name,undecoded}</code></li><li><code·class="inline">{Name,ElementList}</code></li></ul><p>The·use·and·effect·of·the·actions·are·as·follows:</p><ul><li><p><strong><code·class="inline">{Name,undecoded}</code></strong>·-·Leaves·the·element·undecoded.·The·type·of·<code·class="inline">Name</code>·can
192 be·any·ASN.1·type.·The·value·of·element·<code·class="inline">Name</code>·is·returned·as·a·tuple·(as192 be·any·ASN.1·type.·The·value·of·element·<code·class="inline">Name</code>·is·returned·as·a·tuple·(as
193 mentioned·in·the·previous·section)·in·the·value·structure·of·the·top·type.</p></li><li><p><strong><code·class="inline">{Name,parts}</code></strong>·-·The·type·of·<code·class="inline">Name</code>·must·be·either·<code·class="inline">SEQUENCE·OF</code>·or193 mentioned·in·the·previous·section)·in·the·value·structure·of·the·top·type.</p></li><li><p><strong><code·class="inline">{Name,parts}</code></strong>·-·The·type·of·<code·class="inline">Name</code>·must·be·either·<code·class="inline">SEQUENCE·OF</code>·or
194 <code·class="inline">SET·OF</code>.·The·action·implies·that·the·different·components·of·<code·class="inline">Name</code>·are·left194 <code·class="inline">SET·OF</code>.·The·action·implies·that·the·different·components·of·<code·class="inline">Name</code>·are·left
195 undecoded.·The·value·of·<code·class="inline">Name</code>·is·returned·as·a·tuple·(as·mentioned·in·the195 undecoded.·The·value·of·<code·class="inline">Name</code>·is·returned·as·a·tuple·(as·mentioned·in·the
196 previous·section)·where·the·second·element·is·a·list·of·binaries.·This·is196 previous·section)·where·the·second·element·is·a·list·of·binaries.·This·is
Offset 257, 86 lines modifiedOffset 257, 86 lines modified
257 ·{'GUI',257 ·{'GUI',
258 ··[{decode_Window_exclusive,258 ··[{decode_Window_exclusive,
259 ····['Window',[{status,[{buttonList,parts},{actions,undecoded}]}]]},259 ····['Window',[{status,[{buttonList,parts},{actions,undecoded}]}]]},
260 ···{decode_Button_exclusive,260 ···{decode_Button_exclusive,
261 ····['Button',[{number,undecoded}]]}]}}.</code></pre><p>The·following·figure·shows·the·bytes·of·a·<code·class="inline">Window:status</code>·message.·The261 ····['Button',[{number,undecoded}]]}]}}.</code></pre><p>The·following·figure·shows·the·bytes·of·a·<code·class="inline">Window:status</code>·message.·The
262 components·<code·class="inline">buttonList</code>·and·<code·class="inline">actions</code>·are·excluded·from·decode.·Only·<code·class="inline">state</code>·and262 components·<code·class="inline">buttonList</code>·and·<code·class="inline">actions</code>·are·excluded·from·decode.·Only·<code·class="inline">state</code>·and
263 <code·class="inline">enabled</code>·are·decoded·when·<code·class="inline">decode__Window_exclusive</code>·is·called.</p><p><img·src="assets/exclusive_Win_But.gif"·alt="Bytes·of·a·Window:status·Message"·title="Bytes·of·a·Window:status·Message"/></p><p>Here·follows·an·example·of·how·the·module.·Note·that·option·<code·class="inline">no_ok_wrapper</code>·is263 <code·class="inline">enabled</code>·are·decoded·when·<code·class="inline">decode__Window_exclusive</code>·is·called.</p><p><img·src="assets/exclusive_Win_But.gif"·alt="Bytes·of·a·Window:status·Message"·title="Bytes·of·a·Window:status·Message"/></p><p>Here·follows·an·example·of·how·the·module.·Note·that·option·<code·class="inline">no_ok_wrapper</code>·is
264 used·to·make·the·example·more·concise.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">asn1ct</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="2246114954-1">(</span><span·class="ss">&#39;GUI&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-2">[</span><span·class="ss">ber</span><span·class="p">,</span><span·class="ss">asn1config</span><span·class[·...·truncated·by·diffoscope;·len:·142,·SHA:·1d28d65b4e5f41b5c14cbd30e885a80e7699d7cb58a4467c4f24bc612372a051·...·]54-1">)</span><span·class="p">.</span><span·class="w">264 used·to·make·the·example·more·concise.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">asn1ct</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="4523991054-1">(</span><span·class="ss">&#39;GUI&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-2">[</span><span·class="ss">ber</span><span·class="p">,</span><span·class="ss">asn1config</span><span·class[·...·truncated·by·diffoscope;·len:·142,·SHA:·2084ad64f6e2d192e04458f803916d4b9599d7d5ca4bc177e68a91ea716b7e30·...·]54-1">)</span><span·class="p">.</span><span·class="w">
265 </span><span·class="ss">ok</span><span·class="gp·unselectable">265 </span><span·class="ss">ok</span><span·class="gp·unselectable">
266 2&gt;·</span><span·class="nf">rr</span><span·class="p"·data-group-id="2246114954-3">(</span><span·class="ss">&#39;GUI&#39;</span><span·class="p"·data-group-id="2246114954-3">)</span><span·class="p">.</span><span·class="w">266 2&gt;·</span><span·class="nf">rr</span><span·class="p"·data-group-id="4523991054-3">(</span><span·class="ss">&#39;GUI&#39;</span><span·class="p"·data-group-id="4523991054-3">)</span><span·class="p">.</span><span·class="w">
267 </span><span·class="p"·data-group-id="2246114954-4">[</span><span·class="ss">&#39;Action&#39;</span><span·class="p">,</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="2246114954-4">]</span><span·class="gp·unselectable">267 </span><span·class="p"·data-group-id="4523991054-4">[</span><span·class="ss">&#39;Action&#39;</span><span·class="p">,</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="4523991054-4">]</span><span·class="gp·unselectable">
268 3&gt;·</span><span·class="n">ButtonMsg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-5">{</span><span·class="ss">number</span><span·class="o">=</span><span·class="mi">123</span><span·class="p">,</span><span·class="ss">on</span><span·class="o">=</span><span·class="ss">true</span><span·class="p"·data-group-id="2246114954-5">}</span><span·class="p">.</span><span·class="w">268 3&gt;·</span><span·class="n">ButtonMsg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-5">{</span><span·class="ss">number</span><span·class="o">=</span><span·class="mi">123</span><span·class="p">,</span><span·class="ss">on</span><span·class="o">=</span><span·class="ss">true</span><span·class="p"·data-group-id="4523991054-5">}</span><span·class="p">.</span><span·class="w">
269 </span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-6">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">123</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·84,·SHA:·66c880237bc001d7980ed154c852fd5b3734c612f2c312617aad92f705c72f33·...·]54-6">}</span><span·class="gp·unselectable">269 </span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-6">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">123</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·84,·SHA:·565920f7beb3e70d856fbbb31d59ed9d9e674b9186400f2e0a5b443eb30aaf8b·...·]54-6">}</span><span·class="gp·unselectable">
270 4&gt;·</span><span·class="n">ButtonBytes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="2246114954-7">(</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ButtonMsg</span><span·class="p"·data-group-id="2246114954-7">)</span><span·class="p">.</span><span·class="w">270 4&gt;·</span><span·class="n">ButtonBytes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="4523991054-7">(</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ButtonMsg</span><span·class="p"·data-group-id="4523991054-7">)</span><span·class="p">.</span><span·class="w">
271 </span><span·class="p"·data-group-id="2246114954-8">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">123</span><[·...·truncated·by·diffoscope;·len:·189,·SHA:·3b2f95dab8cdd30e95c801f9172c71c9d25926f2c9ff4026272d09ad08ca903d·...·]54-8">&gt;&gt;</span><span·class="gp·unselectable">271 </span><span·class="p"·data-group-id="4523991054-8">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">123</span><[·...·truncated·by·diffoscope;·len:·189,·SHA:·6eda30fc07571fa526d0a35caf09812f91770297a0771badbe1ba433c5083d59·...·]54-8">&gt;&gt;</span><span·class="gp·unselectable">
272 5&gt;·</span><span·class="n">ExclusiveMsgButton</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_Button_exclusive</span><span·class="p"·data-group-id="2246114954-9">(</span><span·class="n">ButtonBytes</span><span·class="p"·data-group-id="2246114954-9">)</span><span·class="p">.</span><span·class="w">272 5&gt;·</span><span·class="n">ExclusiveMsgButton</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_Button_exclusive</span><span·class="p"·data-group-id="4523991054-9">(</span><span·class="n">ButtonBytes</span><span·class="p"·data-group-id="4523991054-9">)</span><span·class="p">.</span><span·class="w">
273 </span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-10">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-11">{</span><span·class="ss">&#39;Button_number&#39;</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·282,·SHA:·59b147da0909e6fd0b3787376666eb4a3c2432784a39be0b0ea58466105c9013·...·]54-11">}</span><span·class="p">,</span><span·class="w">273 </span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-10">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-11">{</span><span·class="ss">&#39;Button_number&#39;</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·282,·SHA:·9ac5519ab0c171de1c5a229ec5ed42a714220185f3b3fb2ac32c0e7884d25adf·...·]54-11">}</span><span·class="p">,</span><span·class="w">
274 ··········</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="2246114954-10">}</span><span·class="gp·unselectable">274 ··········</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="4523991054-10">}</span><span·class="gp·unselectable">
275 6&gt;·</span><span·class="p"·data-group-id="2246114954-13">{</span><span·class="n">UndecKey</span><span·class="p">,</span><span·class="n">UndecBytes</span><span·class="p"·data-group-id="2246114954-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">ExclusiveMsgButton</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p">.</span><span·class="ss">number</span><span·class="p">.</span><span·class="w">275 6&gt;·</span><span·class="p"·data-group-id="4523991054-13">{</span><span·class="n">UndecKey</span><span·class="p">,</span><span·class="n">UndecBytes</span><span·class="p"·data-group-id="4523991054-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">ExclusiveMsgButton</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p">.</span><span·class="ss">number</span><span·class="p">.</span><span·class="w">
276 </span><span·class="p"·data-group-id="2246114954-14">{</span><span·class="ss">&#39;Button_number&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-15">&lt;&lt;</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·126,·SHA:·1dd49a88deb74fbf378240a254b62b603bdfc9da26bc605509c08a9aab38a484·...·]54-14">}</span><span·class="gp·unselectable">276 </span><span·class="p"·data-group-id="4523991054-14">{</span><span·class="ss">&#39;Button_number&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-15">&lt;&lt;</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·126,·SHA:·ac11bada8539bfaf26245af9329e3b597032876d6ea1541bdda1c2aa2b91dd92·...·]54-14">}</span><span·class="gp·unselectable">
277 7&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="2246114954-16">(</span><span·class="n">UndecKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UndecBytes</span><span·class="p"·data-group-id="2246114954-16">)</span><span·class="p">.</span><span·class="w">277 7&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="4523991054-16">(</span><span·class="n">UndecKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UndecBytes</span><span·class="p"·data-group-id="4523991054-16">)</span><span·class="p">.</span><span·class="w">
278 </span><span·class="mi">123</span><span·class="gp·unselectable">278 </span><span·class="mi">123</span><span·class="gp·unselectable">
279 8&gt;·</span><span·class="n">WindowMsg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">279 8&gt;·</span><span·class="n">WindowMsg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
280 </span><span·class="p"·data-group-id="2246114954-17">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-18">{</span><span·class="ss">&#39;Status&#39;</span><span·class="p">,</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">280 </span><span·class="p"·data-group-id="4523991054-17">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-18">{</span><span·class="ss">&#39;Status&#39;</span><span·class="p">,</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">
281 ···</span><span·class="p"·data-group-id="2246114954-19">[</span><span·class="p"·data-group-id="2246114954-20">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="2246114[·...·truncated·by·diffoscope;·len:·1,·SHA:·19581e27de7ced00ff1ce50b2047e7a567c76b1cbaebabe5ef03f7c3017bb5b7·...·]54-20">}</span><span·class="p">,</span><span·class="w">281 ···</span><span·class="p"·data-group-id="4523991054-19">[</span><span·class="p"·data-group-id="4523991054-20">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="4523991[·...·truncated·by·diffoscope;·len:·1,·SHA:·5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9·...·]54-20">}</span><span·class="p">,</span><span·class="w">
282 ····</span><span·class="p"·data-group-id="2246114954-21">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="2246114954-21">}</span><span·class="p">,</span><span·class="w">282 ····</span><span·class="p"·data-group-id="4523991054-21">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="4523991054-21">}</span><span·class="p">,</span><span·class="w">
283 ····</span><span·class="p"·data-group-id="2246114954-22">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="2246114954-22">}</span><span·class="p">,</span><span·class="w">283 ····</span><span·class="p"·data-group-id="4523991054-22">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="4523991054-22">}</span><span·class="p">,</span><span·class="w">
284 ····</span><span·class="p"·data-group-id="2246114954-23">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="2246114954-23">}</span><span·class="p">,</span><span·class="w">284 ····</span><span·class="p"·data-group-id="4523991054-23">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="4523991054-23">}</span><span·class="p">,</span><span·class="w">
285 ····</span><span·class="p"·data-group-id="2246114954-24">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="2246114954-24">}</span><span·class="p"·data-group-id="224611[·...·truncated·by·diffoscope;·len:·2,·SHA:·0e17daca5f3e175f448bacace3bc0da47d0655a74c8dd0dc497a3afbdad95f1f·...·]54-19">]</span><span·class="p">,</span><span·class="w">285 ····</span><span·class="p"·data-group-id="4523991054-24">{</span><span·class="ss">&#39;Button&#39;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="4523991054-24">}</span><span·class="p"·data-group-id="452399[·...·truncated·by·diffoscope;·len:·2,·SHA:·4a44dc15364204a80fe80e9039455cc1608281820fe2b24f1e5233ade6af1dd5·...·]54-19">]</span><span·class="p">,</span><span·class="w">
286 ···</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">286 ···</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
287 ···</span><span·class="p"·data-group-id="2246114954-25">{</span><span·class="ss">possibleActions</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-26">[</span><span·class="p"·data-group-id="2246114954-27">{</span><span·class="ss">&#39;Action&#39;</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·557,·SHA:·09e43fd87d154417183c011fe57cff000fcc7d6eb438544eebe0f6860fe8e52d·...·]54-17">}</span><span·class="p">.</span><span·class="w">287 ···</span><span·class="p"·data-group-id="4523991054-25">{</span><span·class="ss">possibleActions</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-26">[</span><span·class="p"·data-group-id="4523991054-27">{</span><span·class="ss">&#39;Action&#39;</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·557,·SHA:·74231553bd6e4fa31be978260eac060c592e8d41d25f0a5cc326acf0a7203ed3·...·]54-17">}</span><span·class="p">.</span><span·class="w">
288 </span><span·class="p"·data-group-id="2246114954-29">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="2246114954-30">{</span><span·class="ss">state</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">288 </span><span·class="p"·data-group-id="4523991054-29">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="4523991054-30">{</span><span·class="ss">state</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">
289 ········</span><span·class="ss">buttonList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-31">[</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-32">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·201,·SHA:·32ee58202003ee4d298490ac4eae9c6ee302908b596773e20d4bd5cc64db8b19·...·]54-32">}</span><span·class="p">,</span><span·class="w">289 ········</span><span·class="ss">buttonList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-31">[</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-32">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·201,·SHA:·c99964d62ed159135937e40a6ea6135926a17f34f2eaabed8d167a45f8ed2c36·...·]54-32">}</span><span·class="p">,</span><span·class="w">
290 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-33">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·84,·SHA:·511e668bff3d25e5125f07543c145c977a5922c50517d9b6555078179cb546c3·...·]54-33">}</span><span·class="p">,</span><span·class="w">290 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-33">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·84,·SHA:·a5bee9c3b5e34cc3281452b98f7429713cfa2635518ed0a14d05cba5bf99300b·...·]54-33">}</span><span·class="p">,</span><span·class="w">
291 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-34">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·0e52411052ea9a492e615b3958cb777b4ffa1ac9a7bb1a6228651750b18b6917·...·]54-34">}</span><span·class="p">,</span><span·class="w">291 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-34">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·bf7601e3e53805c1cc1ba8d2db6f973c1e6d8b81f60ced46bacb03a58d777790·...·]54-34">}</span><span·class="p">,</span><span·class="w">
292 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-35">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·0e52411052ea9a492e615b3958cb777b4ffa1ac9a7bb1a6228651750b18b6917·...·]54-35">}</span><span·class="p">,</span><span·class="w">292 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-35">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·bf7601e3e53805c1cc1ba8d2db6f973c1e6d8b81f60ced46bacb03a58d777790·...·]54-35">}</span><span·class="p">,</span><span·class="w">
293 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-36">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">7</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·138,·SHA:·754e3e2f9f837d2b69ccab8092ed51226a6c5c11f794b8b6a6466c4d90bb1aba·...·]54-31">]</span><span·class="p">,</span><span·class="w">293 ······················</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-36">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">7</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·138,·SHA:·54fe4a79ddaaff2cff38f56e4ae18acd7e130f43713b5370668694ac942b667c·...·]54-31">]</span><span·class="p">,</span><span·class="w">
294 ········</span><span·class="ss">enabled</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">294 ········</span><span·class="ss">enabled</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
295 ········</span><span·class="ss">actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-37">{</span><span·class="ss">possibleActions</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-38">[</span><span·class="o">#</span><span·class="ss">&#39;Action&#39;</span><span·class="p"·data-group-id="2246114954-39">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">295 ········</span><span·class="ss">actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-37">{</span><span·class="ss">possibleActions</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-38">[</span><span·class="o">#</span><span·class="ss">&#39;Action&#39;</span><span·class="p"·data-group-id="4523991054-39">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">
296 ··············································</span><span·class="ss">handle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-40">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·354,·SHA:·f558959c72f59c69b1138ce4826e2cbe4828a865541385d524e5fd2539c79a67·...·]54-29">}</span><span·class="gp·unselectable">296 ··············································</span><span·class="ss">handle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-40">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·354,·SHA:·e1d51e62f0eb8c8417ca185bde0de7b03fc86dea71da442ed4714ed31cbb5359·...·]54-29">}</span><span·class="gp·unselectable">
297 9&gt;·</span><span·class="n">WindowBytes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="2246114954-41">(</span><span·class="ss">&#39;Window&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">WindowMsg</span><span·class="p"·data-group-id="2246114954-41">)</span><span·class="p">.</span><span·class="w">297 9&gt;·</span><span·class="n">WindowBytes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="4523991054-41">(</span><span·class="ss">&#39;Window&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">WindowMsg</span><span·class="p"·data-group-id="4523991054-41">)</span><span·class="p">.</span><span·class="w">
298 </span><span·class="p"·data-group-id="2246114954-42">&lt;&lt;</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">35</span><span·class="p">,</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">40</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">298 </span><span·class="p"·data-group-id="4523991054-42">&lt;&lt;</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">35</span><span·class="p">,</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">40</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">
299 ··</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2246114954-42">&gt;&gt;</span><span·class="gp·unselectable">299 ··</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="4523991054-42">&gt;&gt;</span><span·class="gp·unselectable">
300 10&gt;·</span><span·class="p"·data-group-id="2246114954-43">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="2246114954-44">{</span><span·class="ss">buttonList</span><span·class="o">=</span><sp[·...·truncated·by·diffoscope;·len:·298,·SHA:·edb92b1b283f54b75345b8d434cb885550709c2aad98e1576cdf349bcf40c3b2·...·]54-43">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">300 10&gt;·</span><span·class="p"·data-group-id="4523991054-43">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="4523991054-44">{</span><span·class="ss">buttonList</span><span·class="o">=</span><sp[·...·truncated·by·diffoscope;·len:·298,·SHA:·bc48dbcacd5314389f8aec6dd307c302aca894c1a94f701def68f7e1a7af8572·...·]54-43">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
301 </span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_Window_exclusive</span><span·class="p"·data-group-id="2246114954-46">(</span><span·class="n">WindowBytes</span><span·class="p"·data-group-id="2246114954-46">)</span><span·class="p">.</span><span·class="w">301 </span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_Window_exclusive</span><span·class="p"·data-group-id="4523991054-46">(</span><span·class="n">WindowBytes</span><span·class="p"·data-group-id="4523991054-46">)</span><span·class="p">.</span><span·class="w">
302 </span><span·class="p"·data-group-id="2246114954-47">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="2246114954-48">{</span><span·class="ss">state</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">302 </span><span·class="p"·data-group-id="4523991054-47">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="4523991054-48">{</span><span·class="ss">state</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">
303 ··················</span><span·class="ss">buttonList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-49">{</span><span·class="ss">&#39;Status_buttonList&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-50">[</span><span·class="p"·data-group-id="2246114954-51">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">303 ··················</span><span·class="ss">buttonList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-49">{</span><span·class="ss">&#39;Status_buttonList&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-50">[</span><span·class="p"·data-group-id="4523991054-51">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
304 ·······················································</span><span·class="mi">255</span><span·class="p"·data-group-id="2246114954-51">&gt;&gt;</span><span·class="p">,</span><span·class="w">304 ·······················································</span><span·class="mi">255</span><span·class="p"·data-group-id="4523991054-51">&gt;&gt;</span><span·class="p">,</span><span·class="w">
305 ·····················································</span><span·class="p"·data-group-id="2246114954-52">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">4</span><s[·...·truncated·by·diffoscope;·len:·186,·SHA:·19f114ce77fd634babd53929c2993f5be6d03ca14d4d4b60da585e297aac56ae·...·]54-52">&gt;&gt;</span><span·class="p">,</span><span·class="w">305 ·····················································</span><span·class="p"·data-group-id="4523991054-52">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">4</span><s[·...·truncated·by·diffoscope;·len:·186,·SHA:·412efac8b85ade77a5be9af1d5c7f500d738ce098741f94b1f1bb203373ff905·...·]54-52">&gt;&gt;</span><span·class="p">,</span><span·class="w">
306 ·····················································</span><span·class="p"·data-group-id="2246114954-53">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">5</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·d15f4bc68299f49bad24096bd9b482cb012542be7a4af3ff9412eb9de6d3c88d·...·]54-53">&gt;&gt;</span><span·class="p">,</span><span·class="w">306 ·····················································</span><span·class="p"·data-group-id="4523991054-53">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">5</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·84753e537925eeb3d1420440a82a3dc972400e15ddaa106254cfadb880f27d67·...·]54-53">&gt;&gt;</span><span·class="p">,</span><span·class="w">
307 ·····················································</span><span·class="p"·data-group-id="2246114954-54">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">6</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·d15f4bc68299f49bad24096bd9b482cb012542be7a4af3ff9412eb9de6d3c88d·...·]54-54">&gt;&gt;</span><span·class="p">,</span><span·class="w">307 ·····················································</span><span·class="p"·data-group-id="4523991054-54">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">6</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·84753e537925eeb3d1420440a82a3dc972400e15ddaa106254cfadb880f27d67·...·]54-54">&gt;&gt;</span><span·class="p">,</span><span·class="w">
308 ·····················································</span><span·class="p"·data-group-id="2246114954-55">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">7</span><s[·...·truncated·by·diffoscope;·len:·301,·SHA:·47b9793c74c5563b1176f8083ac1f802149e2a72c1f3ce0666bf666e22fe83b5·...·]54-49">}</span><span·class="p">,</span><span·class="w">308 ·····················································</span><span·class="p"·data-group-id="4523991054-55">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">7</span><s[·...·truncated·by·diffoscope;·len:·301,·SHA:·d61cb335c59478b500b9292ddee270ea90c50bf5f284b631b31d96a94bb4b16b·...·]54-49">}</span><span·class="p">,</span><span·class="w">
309 ··················</span><span·class="ss">enabled</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">309 ··················</span><span·class="ss">enabled</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
310 ··················</span><span·class="ss">actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-56">{</span><span·class="ss">&#39;Status_actions&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-57">&lt;&lt;</span><span·class="mi">163</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">13</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">310 ··················</span><span·class="ss">actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-56">{</span><span·class="ss">&#39;Status_actions&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-57">&lt;&lt;</span><span·class="mi">163</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">13</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">
311 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">17</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="w">311 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">17</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="w">
312 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">255</span><span·class="p"·data-group-id="2246114954-57">&gt;&gt;</span><span·class="p"·data-group-id="2246114954-56">}</span><span·class="p"·data-group-id="2246114954-48">}</span><span·class="p"·data-group-id="2246114954-47">}</span><span·class="gp·unselectable">312 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">255</span><span·class="p"·data-group-id="4523991054-57">&gt;&gt;</span><span·class="p"·data-group-id="4523991054-56">}</span><span·class="p"·data-group-id="4523991054-48">}</span><span·class="p"·data-group-id="4523991054-47">}</span><span·class="gp·unselectable">
313 11&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="2246114954-58">(</span><span·class="n">UndecWindowKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UndecWindowParts</span><span·class="p"·data-group-id="2246114954-58">)</span><span·class="p">.</span><span·class="w">313 11&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="4523991054-58">(</span><span·class="n">UndecWindowKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UndecWindowParts</span><span·class="p"·data-group-id="4523991054-58">)</span><span·class="p">.</span><span·class="w">
314 </span><span·class="p"·data-group-id="2246114954-59">[</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-60">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·201,·SHA:·32ee58202003ee4d298490ac4eae9c6ee302908b596773e20d4bd5cc64db8b19·...·]54-60">}</span><span·class="p">,</span><span·class="w">314 </span><span·class="p"·data-group-id="4523991054-59">[</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-60">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·201,·SHA:·c99964d62ed159135937e40a6ea6135926a17f34f2eaabed8d167a45f8ed2c36·...·]54-60">}</span><span·class="p">,</span><span·class="w">
315 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-61">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·84,·SHA:·511e668bff3d25e5125f07543c145c977a5922c50517d9b6555078179cb546c3·...·]54-61">}</span><span·class="p">,</span><span·class="w">315 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-61">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·84,·SHA:·a5bee9c3b5e34cc3281452b98f7429713cfa2635518ed0a14d05cba5bf99300b·...·]54-61">}</span><span·class="p">,</span><span·class="w">
316 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-62">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·0e52411052ea9a492e615b3958cb777b4ffa1ac9a7bb1a6228651750b18b6917·...·]54-62">}</span><span·class="p">,</span><span·class="w">316 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-62">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·bf7601e3e53805c1cc1ba8d2db6f973c1e6d8b81f60ced46bacb03a58d777790·...·]54-62">}</span><span·class="p">,</span><span·class="w">
317 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-63">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·0e52411052ea9a492e615b3958cb777b4ffa1ac9a7bb1a6228651750b18b6917·...·]54-63">}</span><span·class="p">,</span><span·class="w">317 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-63">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">6</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·bf7601e3e53805c1cc1ba8d2db6f973c1e6d8b81f60ced46bacb03a58d777790·...·]54-63">}</span><span·class="p">,</span><span·class="w">
318 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-64">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">7</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·138,·SHA:·8394660286a874fe15bbcbca949b7bfb8bbd18e4b85f38b20fb3fe23b295fdf1·...·]54-59">]</span><span·class="gp·unselectable">318 ·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-64">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">7</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·138,·SHA:·0f594fb098a290b29f772328804d0ac692e6c08ff3b04632ed2acc20ebdca56b·...·]54-59">]</span><span·class="gp·unselectable">
319 12&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="2246114954-65">(</span><span·class="n">UndecWindowKey</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">hd</span><span·class="p"·data-group-id="2246114954-66">(</span><span·class="n">UndecWindowParts</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·64,·SHA:·f6f8151f5aa73234e61bc37e4b1c52fb648362f8ca33729f6a15d3615c561e65·...·]54-65">)</span><span·class="p">.</span><span·class="w">319 12&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="4523991054-65">(</span><span·class="n">UndecWindowKey</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">hd</span><span·class="p"·data-group-id="4523991054-66">(</span><span·class="n">UndecWindowParts</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·64,·SHA:·c5ab1f62b56c90deb6d8342a49706a56e8a727d1cf975fc930ef392e7b3b7205·...·]54-65">)</span><span·class="p">.</span><span·class="w">
320 </span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-67">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·0e52411052ea9a492e615b3958cb777b4ffa1ac9a7bb1a6228651750b18b6917·...·]54-67">}</span><span·class="gp·unselectable">320 </span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-67">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·83,·SHA:·bf7601e3e53805c1cc1ba8d2db6f973c1e6d8b81f60ced46bacb03a58d777790·...·]54-67">}</span><span·class="gp·unselectable">
321 13&gt;·</span><span·class="p"·data-group-id="2246114954-68">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="2246114954-69">{</span><span·class="ss">actions</span><span·class="o">=</span><span·[·...·truncated·by·diffoscope;·len:·516,·SHA:·f44b6dc506d71f168c450a140330b94bc4125113349382ea864cfadf879b0701·...·]54-71">)</span><span·class="p">.</span><span·class="w">321 13&gt;·</span><span·class="p"·data-group-id="4523991054-68">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="4523991054-69">{</span><span·class="ss">actions</span><span·class="o">=</span><span·[·...·truncated·by·diffoscope;·len:·516,·SHA:·e36382636ea4a3d464cbf55532e1061a6b96211aeabc58d46db77e06175b2e51·...·]54-71">)</span><span·class="p">.</span><span·class="w">
322 </span><span·class="p"·data-group-id="2246114954-72">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="2246114954-73">{</span><span·class="ss">state</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">322 </span><span·class="p"·data-group-id="4523991054-72">{</span><span·class="ss">status</span><span·class="p">,</span><span·class="o">#</span><span·class="ss">&#39;Status&#39;</span><span·class="p"·data-group-id="4523991054-73">{</span><span·class="ss">state</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">35</span><span·class="p">,</span><span·class="w">
323 ··················</span><span·class="ss">buttonList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-74">{</span><span·class="ss">&#39;Status_buttonList&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-75">[</span><span·class="p"·data-group-id="2246114954-76">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">323 ··················</span><span·class="ss">buttonList</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-74">{</span><span·class="ss">&#39;Status_buttonList&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-75">[</span><span·class="p"·data-group-id="4523991054-76">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
324 ·······················································</span><span·class="mi">255</span><span·class="p"·data-group-id="2246114954-76">&gt;&gt;</span><span·class="p">,</span><span·class="w">324 ·······················································</span><span·class="mi">255</span><span·class="p"·data-group-id="4523991054-76">&gt;&gt;</span><span·class="p">,</span><span·class="w">
325 ·····················································</span><span·class="p"·data-group-id="2246114954-77">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">4</span><s[·...·truncated·by·diffoscope;·len:·186,·SHA:·19f114ce77fd634babd53929c2993f5be6d03ca14d4d4b60da585e297aac56ae·...·]54-77">&gt;&gt;</span><span·class="p">,</span><span·class="w">325 ·····················································</span><span·class="p"·data-group-id="4523991054-77">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">4</span><s[·...·truncated·by·diffoscope;·len:·186,·SHA:·412efac8b85ade77a5be9af1d5c7f500d738ce098741f94b1f1bb203373ff905·...·]54-77">&gt;&gt;</span><span·class="p">,</span><span·class="w">
326 ·····················································</span><span·class="p"·data-group-id="2246114954-78">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">5</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·d15f4bc68299f49bad24096bd9b482cb012542be7a4af3ff9412eb9de6d3c88d·...·]54-78">&gt;&gt;</span><span·class="p">,</span><span·class="w">326 ·····················································</span><span·class="p"·data-group-id="4523991054-78">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">5</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·84753e537925eeb3d1420440a82a3dc972400e15ddaa106254cfadb880f27d67·...·]54-78">&gt;&gt;</span><span·class="p">,</span><span·class="w">
327 ·····················································</span><span·class="p"·data-group-id="2246114954-79">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">6</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·d15f4bc68299f49bad24096bd9b482cb012542be7a4af3ff9412eb9de6d3c88d·...·]54-79">&gt;&gt;</span><span·class="p">,</span><span·class="w">327 ·····················································</span><span·class="p"·data-group-id="4523991054-79">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">6</span><s[·...·truncated·by·diffoscope;·len:·188,·SHA:·84753e537925eeb3d1420440a82a3dc972400e15ddaa106254cfadb880f27d67·...·]54-79">&gt;&gt;</span><span·class="p">,</span><span·class="w">
328 ·····················································</span><span·class="p"·data-group-id="2246114954-80">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">7</span><s[·...·truncated·by·diffoscope;·len:·301,·SHA:·ee4f15795c1cf82c7f1d41fec9f4d5eb05c21cefa21063eaab2f4574af9c8626·...·]54-74">}</span><span·class="p">,</span><span·class="w">328 ·····················································</span><span·class="p"·data-group-id="4523991054-80">&lt;&lt;</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">7</span><s[·...·truncated·by·diffoscope;·len:·301,·SHA:·ca97d17432b39b33e4c2b2b2120513bf50e5bcaf6096e5d131ff8d2bbb8cd258·...·]54-74">}</span><span·class="p">,</span><span·class="w">
329 ··················</span><span·class="ss">enabled</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">329 ··················</span><span·class="ss">enabled</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
330 ··················</span><span·class="ss">actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2246114954-81">{</span><span·class="ss">&#39;Status_actions&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-82">&lt;&lt;</span><span·class="mi">163</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">13</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">330 ··················</span><span·class="ss">actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4523991054-81">{</span><span·class="ss">&#39;Status_actions&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-82">&lt;&lt;</span><span·class="mi">163</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">13</span><span·class="p">,</span><span·class="mi">48</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">
331 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">17</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="w">331 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">161</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">17</span><span·class="p">,</span><span·class="mi">129</span><span·class="p">,</span><span·class="w">
332 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">255</span><span·class="p"·data-group-id="2246114954-82">&gt;&gt;</span><span·class="p"·data-group-id="2246114954-81">}</span><span·class="p"·data-group-id="2246114954-73">}</span><span·class="p"·data-group-id="2246114954-72">}</span><span·class="gp·unselectable">332 ················································</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">255</span><span·class="p"·data-group-id="4523991054-82">&gt;&gt;</span><span·class="p"·data-group-id="4523991054-81">}</span><span·class="p"·data-group-id="4523991054-73">}</span><span·class="p"·data-group-id="4523991054-72">}</span><span·class="gp·unselectable">
333 14&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="2246114954-83">(</span><span·class="n">ChoiceKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ChoiceUndec</span><span·class="p"·data-group-id="2246114954-83">)</span><span·class="p">.</span><span·class="w">333 14&gt;·</span><span·class="nc">&#39;GUI&#39;</span><span·class="p">:</span><span·class="nf">decode_part</span><span·class="p"·data-group-id="4523991054-83">(</span><span·class="n">ChoiceKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ChoiceUndec</span><span·class="p"·data-group-id="4523991054-83">)</span><span·class="p">.</span><span·class="w">
334 </span><span·class="p"·data-group-id="2246114954-84">{</span><span·class="ss">possibleActions</span><span·class="p">,</span><span·class="p"·data-group-id="2246114954-85">[</span><span·class="o">#</span><span·class="ss">&#39;Action&#39;</span><span·class="p"·data-group-id="2246114954-86">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">334 </span><span·class="p"·data-group-id="4523991054-84">{</span><span·class="ss">possibleActions</span><span·class="p">,</span><span·class="p"·data-group-id="4523991054-85">[</span><span·class="o">#</span><span·class="ss">&#39;Action&#39;</span><span·class="p"·data-group-id="4523991054-86">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">,</span><span·class="w">
335 ····························</span><span·class="ss">handle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="2246114954-87">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·246,·SHA:·4d483645ee111be50a0be8896b4c20b6408334939386af3f16b5689fd2850452·...·]54-84">}</span></code></pre><h2·id="selective-decode"·class="section-heading">335 ····························</span><span·class="ss">handle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Button&#39;</span><span·class="p"·data-group-id="4523991054-87">{</span><span·class="ss">number</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">17</span><span·class="p">,</span><span·class="ss">on</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·246,·SHA:·c8ce9c11d78139f62e164458d701067417047e3793e451a1b9e7a5abe04aae2a·...·]54-84">}</span></code></pre><h2·id="selective-decode"·class="section-heading">
336 ··<a·href="#selective-decode"·class="hover-link">336 ··<a·href="#selective-decode"·class="hover-link">
337 ····<i·class="ri-link-m"·aria-hidden="true"></i>337 ····<i·class="ri-link-m"·aria-hidden="true"></i>
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481 <p>Performs·a·test·of·encode·and·decode·of·types·in·<code·class="inline">Module</code>.</p><p>The·generated·functions·are·called·by·this·function.·This·function·is481 <p>Performs·a·test·of·encode·and·decode·of·types·in·<code·class="inline">Module</code>.</p><p>The·generated·functions·are·called·by·this·function.·This·function·is
482 useful·for·testing·to·ensure·that·the·generated·encode·and·decode482 useful·for·testing·to·ensure·that·the·generated·encode·and·decode
483 functions·as·well·as·the·general·runtime·support·work·as·expected.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Currently,·the·<code·class="inline">test</code>·functions·have·many·limitations.·Essentially,·they·will483 functions·as·well·as·the·general·runtime·support·work·as·expected.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Currently,·the·<code·class="inline">test</code>·functions·have·many·limitations.·Essentially,·they·will
484 mostly·work·for·old·specifications·based·on·the·1997·standard·for·ASN.1,·but484 mostly·work·for·old·specifications·based·on·the·1997·standard·for·ASN.1,·but
485 not·for·most·modern-style·applications.·Another·limitation·is·that·the·<code·class="inline">test</code>485 not·for·most·modern-style·applications.·Another·limitation·is·that·the·<code·class="inline">test</code>
486 functions·may·not·work·if·options·that·change·code·generations·strategies·such486 functions·may·not·work·if·options·that·change·code·generations·strategies·such
487 as·the·options·<code·class="inline">macro_name_prefix</code>·and·<code·class="inline">record_name_prefix</code>·have·been·used.</p></section><ul><li><a·href="#test/1"><code·class="inline">test/1</code></a>·iterates·over·all·types·in·<code·class="inline">Module</code>.</li><li><a·href="#test/2"><code·class="inline">test/2</code></a>·tests·type·<code·class="inline">Type</code>·with·a·random·value.</li><li><a·href="#test/3"><code·class="inline">test/3</code></a>·tests·type·<code·class="inline">Type</code>·with·<code·class="inline">Value</code>.</li></ul><p>Schematically,·the·following·occurs·for·each·type·in·the·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6903211258-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p"·data-group-id="6903211258-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·274,·SHA:·36d5a6316beec64da456e002f3f9817337c0cecc6713e3aa76f3c1af819e1b49·...·]-2">)</span><span·class="p">,</span><span·class="w">487 as·the·options·<code·class="inline">macro_name_prefix</code>·and·<code·class="inline">record_name_prefix</code>·have·been·used.</p></section><ul><li><a·href="#test/1"><code·class="inline">test/1</code></a>·iterates·over·all·types·in·<code·class="inline">Module</code>.</li><li><a·href="#test/2"><code·class="inline">test/2</code></a>·tests·type·<code·class="inline">Type</code>·with·a·random·value.</li><li><a·href="#test/3"><code·class="inline">test/3</code></a>·tests·type·<code·class="inline">Type</code>·with·<code·class="inline">Value</code>.</li></ul><p>Schematically,·the·following·occurs·for·each·type·in·the·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4710822191-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p"·data-group-id="4710822191-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·274,·SHA:·9948236a9216c68d0598a59453aa4388a10826a8b37989f8cfa013bc69e1f8d3·...·]-2">)</span><span·class="p">,</span><span·class="w">
488 </span><span·class="p"·data-group-id="6903211258-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bytes</span><span·class="p"·data-group-id="6903211258-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·273,·SHA:·6ac2e2de9fcdfeb2aaee7188df31d0afa6fb90eaa67d3a0f571c17218e8f34f8·...·]-4">)</span><span·class="p">,</span><span·class="w">488 </span><span·class="p"·data-group-id="4710822191-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bytes</span><span·class="p"·data-group-id="4710822191-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·273,·SHA:·ec22b4dd1ea5bd626e0365ceeb0c4bda09a64e1e455783f58bc35c7422b3e322·...·]-4">)</span><span·class="p">,</span><span·class="w">
489 </span><span·class="p"·data-group-id="6903211258-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p"·data-group-id="6903211258-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·273,·SHA:·d0fc4e2f267dfe08aaf08f53c163e3964a0611e78d68c5fed9adb37ea721c09d·...·]-6">)</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">test</code>·functions·use·the·<code·class="inline">*.asn1db</code>·files·for·all·included·modules.·If·they489 </span><span·class="p"·data-group-id="4710822191-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p"·data-group-id="4710822191-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·273,·SHA:·bb231f1055085c39d6e91b959a0549c3603ad807efbf7246897c06b2512f2b54·...·]-6">)</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">test</code>·functions·use·the·<code·class="inline">*.asn1db</code>·files·for·all·included·modules.·If·they
490 are·located·in·a·different·directory·than·the·current·working·directory,·use·the490 are·located·in·a·different·directory·than·the·current·working·directory,·use·the
491 <code·class="inline">include</code>·option·to·add·paths.·This·is·only·needed·when·automatically·generating491 <code·class="inline">include</code>·option·to·add·paths.·This·is·only·needed·when·automatically·generating
492 values.·For·static·values·using·<code·class="inline">Value</code>·no·options·are·needed.</p>492 values.·For·static·values·using·<code·class="inline">Value</code>·no·options·are·needed.</p>
493 ··</section>493 ··</section>
494 </section>494 </section>
495 <section·class="detail"·id="value/2">495 <section·class="detail"·id="value/2">
  
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548 ······<p·class="built-using">548 ······<p·class="built-using">
549 ········Built·using549 ········Built·using
550 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the550 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
551 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>551 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
552 ······</p>552 ······</p>
553 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>553 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
554 ····</footer>554 ····</footer>
555 ··</div>555 ··</div>
556 </main>556 </main>
557 </div>557 </div>
558 <script>558 <script>
559 ··function·mermaidLoaded()·{559 ··function·mermaidLoaded()·{
560 ····mermaid.initialize({560 ····mermaid.initialize({
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151 </h3>151 </h3>
152 <ul><li><p>The·JER·backend·will·now·include·the·SIZE·constraint·in·the·type·info·for·OCTET·STRINGs,·and·a·SIZE·constraint·with·a·range·will·now·be·included·for·BIT·STRINGs.·This·does·not·change·the·actual·encoding·or·decoding·of·JER,·but·can·be·useful·for·tools.</p><p>Own·Id:·OTP-19542·Aux·Id:·ERIERL-1204,·<a·href="https://github.com/erlang/otp/pull/9588"·title="">PR-9588</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">152 <ul><li><p>The·JER·backend·will·now·include·the·SIZE·constraint·in·the·type·info·for·OCTET·STRINGs,·and·a·SIZE·constraint·with·a·range·will·now·be·included·for·BIT·STRINGs.·This·does·not·change·the·actual·encoding·or·decoding·of·JER,·but·can·be·useful·for·tools.</p><p>Own·Id:·OTP-19542·Aux·Id:·ERIERL-1204,·<a·href="https://github.com/erlang/otp/pull/9588"·title="">PR-9588</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">
153 ··<a·href="#improvements-and-new-features"·class="hover-link">153 ··<a·href="#improvements-and-new-features"·class="hover-link">
154 ····<i·class="ri-link-m"·aria-hidden="true"></i>154 ····<i·class="ri-link-m"·aria-hidden="true"></i>
155 ··</a>155 ··</a>
156 ··<span·class="text">Improvements·and·New·Features</span>156 ··<span·class="text">Improvements·and·New·Features</span>
157 </h3>157 </h3>
158 <ul><li><p>When·using·the·JSON·encoding·rules,·it·is·now·possible·to·call·the·decode/2·function·in·the·following·way·with·data·that·has·already·been·decoded·by·json:decode/1:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">SomeModule</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="5440560996-1">(</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5440560996-2">{</span><span·class="ss">json_decoded</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Decode[·...·truncated·by·diffoscope;·len:·102,·SHA:·f861691d44f789baea7f4c059ad70f9500252f5feda3ffcbbb7351e2d5f465a7·...·]-1">)</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-19547·Aux·Id:·ERIERL-1206,·<a·href="https://github.com/erlang/otp/pull/9611"·title="">PR-9611</a></p></li></ul><h2·id="asn1-5-3-2"·class="section-heading">158 <ul><li><p>When·using·the·JSON·encoding·rules,·it·is·now·possible·to·call·the·decode/2·function·in·the·following·way·with·data·that·has·already·been·decoded·by·json:decode/1:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">SomeModule</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="0882670935-1">(</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0882670935-2">{</span><span·class="ss">json_decoded</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Decode[·...·truncated·by·diffoscope;·len:·102,·SHA:·ef8129b46ca68211468e7ef2d6719de9a212d1d5920284c2b1cb99edd9c9c4de·...·]-1">)</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-19547·Aux·Id:·ERIERL-1206,·<a·href="https://github.com/erlang/otp/pull/9611"·title="">PR-9611</a></p></li></ul><h2·id="asn1-5-3-2"·class="section-heading">
159 ··<a·href="#asn1-5-3-2"·class="hover-link">159 ··<a·href="#asn1-5-3-2"·class="hover-link">
160 ····<i·class="ri-link-m"·aria-hidden="true"></i>160 ····<i·class="ri-link-m"·aria-hidden="true"></i>
161 ··</a>161 ··</a>
162 ··<span·class="text">Asn1·5.3.2</span>162 ··<span·class="text">Asn1·5.3.2</span>
163 </h2>163 </h2>
164 <h3·id="fixed-bugs-and-malfunctions-2"·class="section-heading">164 <h3·id="fixed-bugs-and-malfunctions-2"·class="section-heading">
165 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">165 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">
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149 </main>149 </main>
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211 <a·href="write_test_chapter.html#intro">Writing·Test·Suites</a>.</p><p>A·test·case·is·considered·successful·if·it·returns·to·the·caller,·no·matter·what211 <a·href="write_test_chapter.html#intro">Writing·Test·Suites</a>.</p><p>A·test·case·is·considered·successful·if·it·returns·to·the·caller,·no·matter·what
212 the·returned·value·is.·However,·a·few·return·values·have·special·meaning·as212 the·returned·value·is.·However,·a·few·return·values·have·special·meaning·as
213 follows:</p><ul><li><code·class="inline">{skip,Reason}</code>·indicates·that·the·test·case·is·skipped.</li><li><code·class="inline">{comment,Comment}</code>·prints·a·comment·in·the·log·for·the·test·case.</li><li><code·class="inline">{save_config,Config}</code>·makes·the·<code·class="inline">Common·Test</code>·test·server·pass·<code·class="inline">Config</code>·to213 follows:</p><ul><li><code·class="inline">{skip,Reason}</code>·indicates·that·the·test·case·is·skipped.</li><li><code·class="inline">{comment,Comment}</code>·prints·a·comment·in·the·log·for·the·test·case.</li><li><code·class="inline">{save_config,Config}</code>·makes·the·<code·class="inline">Common·Test</code>·test·server·pass·<code·class="inline">Config</code>·to
214 the·next·test·case.</li></ul><p>A·test·case·failure·is·specified·as·a·runtime·error·(a·crash),·no·matter·what214 the·next·test·case.</li></ul><p>A·test·case·failure·is·specified·as·a·runtime·error·(a·crash),·no·matter·what
215 the·reason·for·termination·is.·If·you·use·Erlang·pattern·matching·effectively,215 the·reason·for·termination·is.·If·you·use·Erlang·pattern·matching·effectively,
216 you·can·take·advantage·of·this·property.·The·result·is·concise·and·readable·test216 you·can·take·advantage·of·this·property.·The·result·is·concise·and·readable·test
217 case·functions·that·look·much·more·like·scripts·than·actual·programs.·A·simple217 case·functions·that·look·much·more·like·scripts·than·actual·programs.·A·simple
218 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">session</span><span·class="p"·data-group-id="6993429874-1">(</span><span·class="p">_</span><span·class="n">Config</span><span·class="p"·data-group-id="6993429874-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">218 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">session</span><span·class="p"·data-group-id="9842780209-1">(</span><span·class="p">_</span><span·class="n">Config</span><span·class="p"·data-group-id="9842780209-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
219 ····</span><span·class="p"·data-group-id="6993429874-2">{</span><span·class="ss">started</span><span·class="p">,</span><span·class="n">ServerId</span><span·class="p"·data-group-id="6993429874-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_ser[·...·truncated·by·diffoscope;·len:·157,·SHA:·c8ade8da72c9d51bd536fa809e33e4d586e889a034cc03d9e51cae46985c0f5f·...·]-3">)</span><span·class="p">,</span><span·class="w">219 ····</span><span·class="p"·data-group-id="9842780209-2">{</span><span·class="ss">started</span><span·class="p">,</span><span·class="n">ServerId</span><span·class="p"·data-group-id="9842780209-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_ser[·...·truncated·by·diffoscope;·len:·157,·SHA:·6402b69dfb6f1f4d005694d0c35069fc2e06f2630af8541ea7e9c48ef1fda285·...·]-3">)</span><span·class="p">,</span><span·class="w">
220 ····</span><span·class="p"·data-group-id="6993429874-4">{</span><span·class="ss">clients</span><span·class="p">,</span><span·class="p"·data-group-id="6993429874-5">[</span><span·class="p"·data-group-id="6993429874-5">]</span><span·class="p"·data-group-id="6993429874-4">}</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·269,·SHA:·73daa94b3fe941a37e8cf987e04c463cc8ac98a28ef0c49568214a0e23f027ea·...·]-6">)</span><span·class="p">,</span><span·class="w">220 ····</span><span·class="p"·data-group-id="9842780209-4">{</span><span·class="ss">clients</span><span·class="p">,</span><span·class="p"·data-group-id="9842780209-5">[</span><span·class="p"·data-group-id="9842780209-5">]</span><span·class="p"·data-group-id="9842780209-4">}</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·269,·SHA:·2efca1eaec7f775584a95a5e80d50c5aa8d38772f78892c6483e16ef30a30717·...·]-6">)</span><span·class="p">,</span><span·class="w">
221 ····</span><span·class="n">MyId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6993429874-7">(</span><span·class="p"·data-group-id="6993429874-7">)</span><span·class="p">,</span><span·class="w">221 ····</span><span·class="n">MyId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="9842780209-7">(</span><span·class="p"·data-group-id="9842780209-7">)</span><span·class="p">,</span><span·class="w">
222 ····</span><span·class="ss">connected</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="6993429874-8">(</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyId</span><span·class="p"·data-group-id="6993429874-8">)</span><span·class="p">,</span><span·class="w">222 ····</span><span·class="ss">connected</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="9842780209-8">(</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyId</span><span·class="p"·data-group-id="9842780209-8">)</span><span·class="p">,</span><span·class="w">
223 ····</span><span·class="p"·data-group-id="6993429874-9">{</span><span·class="ss">clients</span><span·class="p">,</span><span·class="p"·data-group-id="6993429874-10">[</span><span·class="n">MyId</span><span·class="p"·data-group-id="6993429874-10">]</span><span·class="p"·data-group-id="6993429874-9"[·...·truncated·by·diffoscope;·len:·299,·SHA:·d10ad0bcbc9fef4df9546d037f8ab21f15f9b41e8b4e200c7e601e7e00a615d3·...·]-11">)</span><span·class="p">,</span><span·class="w">223 ····</span><span·class="p"·data-group-id="9842780209-9">{</span><span·class="ss">clients</span><span·class="p">,</span><span·class="p"·data-group-id="9842780209-10">[</span><span·class="n">MyId</span><span·class="p"·data-group-id="9842780209-10">]</span><span·class="p"·data-group-id="9842780209-9"[·...·truncated·by·diffoscope;·len:·299,·SHA:·c0e85317d6a836d1c6f5e17a18a848794b8bd929008119f204c025db37612229·...·]-11">)</span><span·class="p">,</span><span·class="w">
224 ····</span><span·class="ss">disconnected</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="6993429874-12">(</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyId</span><span·class="p"·data-group-id="6993429874-12">)</span><span·class="p">,</span><span·class="w">224 ····</span><span·class="ss">disconnected</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="9842780209-12">(</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyId</span><span·class="p"·data-group-id="9842780209-12">)</span><span·class="p">,</span><span·class="w">
225 ····</span><span·class="p"·data-group-id="6993429874-13">{</span><span·class="ss">clients</span><span·class="p">,</span><span·class="p"·data-group-id="6993429874-14">[</span><span·class="p"·data-group-id="6993429874-14">]</span><span·class="p"·data-group-id="6993429874-13">}</span><span·class="w">[·...·truncated·by·diffoscope;·len:·274,·SHA:·0383472ea53781f371a172dc1c27a664da10bf6b97d569d815a40d4aed1dc2ff·...·]-15">)</span><span·class="p">,</span><span·class="w">225 ····</span><span·class="p"·data-group-id="9842780209-13">{</span><span·class="ss">clients</span><span·class="p">,</span><span·class="p"·data-group-id="9842780209-14">[</span><span·class="p"·data-group-id="9842780209-14">]</span><span·class="p"·data-group-id="9842780209-13">}</span><span·class="w">[·...·truncated·by·diffoscope;·len:·274,·SHA:·5acabc19e85e432fd72b126564215cdb6a0345ecfc8916a545f47e06443dfd31·...·]-15">)</span><span·class="p">,</span><span·class="w">
226 ····</span><span·class="ss">stopped</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="6993429874-16">(</span><span·class="n">ServerId</span><span·class="p"·data-group-id="6993429874-16">)</span><span·class="p">.</span></code></pre><p>As·a·test·suite·runs,·all·information·(including·output·to·<code·class="inline">stdout</code>)·is·recorded226 ····</span><span·class="ss">stopped</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9842780209-16">(</span><span·class="n">ServerId</span><span·class="p"·data-group-id="9842780209-16">)</span><span·class="p">.</span></code></pre><p>As·a·test·suite·runs,·all·information·(including·output·to·<code·class="inline">stdout</code>)·is·recorded
227 in·many·different·log·files.·A·minimum·of·information·is·displayed·in·the·user227 in·many·different·log·files.·A·minimum·of·information·is·displayed·in·the·user
228 console·(only·start·and·stop·information,·plus·a·note·for·each·failed·test228 console·(only·start·and·stop·information,·plus·a·note·for·each·failed·test
229 case).</p><p>The·result·from·each·test·case·is·recorded·in·a·dedicated·HTML·log·file,·created229 case).</p><p>The·result·from·each·test·case·is·recorded·in·a·dedicated·HTML·log·file,·created
230 for·the·particular·test·run.·An·overview·page·displays·each·test·case230 for·the·particular·test·run.·An·overview·page·displays·each·test·case
231 represented·by·a·table·row·showing·total·execution·time,·if·the·case·was231 represented·by·a·table·row·showing·total·execution·time,·if·the·case·was
232 successful,·failed,·or·skipped,·plus·an·optional·user·comment.·For·a·failed·test232 successful,·failed,·or·skipped,·plus·an·optional·user·comment.·For·a·failed·test
233 case,·the·reason·for·termination·is·also·printed·in·the·comment·field.·The233 case,·the·reason·for·termination·is·also·printed·in·the·comment·field.·The
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300 ········Built·using300 ········Built·using
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302 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>302 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
303 ······</p>303 ······</p>
304 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>304 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
305 ····</footer>305 ····</footer>
306 ··</div>306 ··</div>
307 </main>307 </main>
308 </div>308 </div>
309 <script>309 <script>
310 ··function·mermaidLoaded()·{310 ··function·mermaidLoaded()·{
311 ····mermaid.initialize({311 ····mermaid.initialize({
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179 ······<p·class="built-using">179 ······<p·class="built-using">
180 ········Built·using180 ········Built·using
181 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the181 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
182 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>182 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
183 ······</p>183 ······</p>
184 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>184 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
185 ····</footer>185 ····</footer>
186 ··</div>186 ··</div>
187 </main>187 </main>
188 </div>188 </div>
189 <script>189 <script>
190 ··function·mermaidLoaded()·{190 ··function·mermaidLoaded()·{
191 ····mermaid.initialize({191 ····mermaid.initialize({
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138 properties·without·modifying·the·test·suites·using·the·data.·Examples·of138 properties·without·modifying·the·test·suites·using·the·data.·Examples·of
139 configuration·data·follows:</p><ul><li>Addresses·to·the·test·plant·or·other·instruments</li><li>User·login·information</li><li>Names·of·files·needed·by·the·test</li><li>Names·of·programs·to·be·executed·during·the·test</li><li>Any·other·variable·needed·by·the·test</li></ul><h2·id="syntax"·class="section-heading">139 configuration·data·follows:</p><ul><li>Addresses·to·the·test·plant·or·other·instruments</li><li>User·login·information</li><li>Names·of·files·needed·by·the·test</li><li>Names·of·programs·to·be·executed·during·the·test</li><li>Any·other·variable·needed·by·the·test</li></ul><h2·id="syntax"·class="section-heading">
140 ··<a·href="#syntax"·class="hover-link">140 ··<a·href="#syntax"·class="hover-link">
141 ····<i·class="ri-link-m"·aria-hidden="true"></i>141 ····<i·class="ri-link-m"·aria-hidden="true"></i>
142 ··</a>142 ··</a>
143 ··<span·class="text">Syntax</span>143 ··<span·class="text">Syntax</span>
144 </h2>144 </h2>
145 <p>A·configuration·file·can·contain·any·number·of·elements·of·the·type:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4102385010-1">{</span><span·class="n">CfgVarName</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="4102385010-1">}</span><span·class="p">.</span></code></pre><p>where</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">CfgVarName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0383409245-1">(</span><span·class="p"·data-group-id="0383409245-1">)</span><span·class="w"> 
146 </span><span·class="n">Value</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="0383409245-2">(</span><span·class="p"·data-group-id="0383409245-2">)</span><span·class="w">[·...·truncated·by·diffoscope;·len:·438,·SHA:·1da1ded761ed2726d8b3007c332cc32bc56657f34627db19f91c1ee3b98665d2·...·]">145 <p>A·configuration·file·can·contain·any·number·of·elements·of·the·type:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4093219795-1">{</span><span·class="n">CfgVarName</span><span·class="p">,</span><span·class="n">Value</s[·...·truncated·by·diffoscope;·len:·407,·SHA:·20d4cd95d0083cb886f8c9d4b495769421834a4c10bd21166ef0f87436359b44·...·]">
 146 </span><span·class="n">Value</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="5446157212-2">(</span><span·class="p"·data-group-id="5446157212-2">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="5446157212-3">[</span><span·class="p"·data-group-id="5446157212-4">{</span><span·class="n">CfgVarName</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="5446157212-4">}</span><span·class="p"·data-group-id="5446157212-3">]</span></code></pre><h2·id="requiring-and-reading-configuration-data"·class="section-heading">
147 ··<a·href="#requiring-and-reading-configuration-data"·class="hover-link">147 ··<a·href="#requiring-and-reading-configuration-data"·class="hover-link">
148 ····<i·class="ri-link-m"·aria-hidden="true"></i>148 ····<i·class="ri-link-m"·aria-hidden="true"></i>
149 ··</a>149 ··</a>
150 ··<span·class="text">Requiring·and·Reading·Configuration·Data</span>150 ··<span·class="text">Requiring·and·Reading·Configuration·Data</span>
151 </h2>151 </h2>
152 <p><a·href=""·id="require_config_data"></a></p><p>In·a·test·suite,·one·must·<em>require</em>·that·a·configuration·variable·(<code·class="inline">CfgVarName</code>152 <p><a·href=""·id="require_config_data"></a></p><p>In·a·test·suite,·one·must·<em>require</em>·that·a·configuration·variable·(<code·class="inline">CfgVarName</code>
153 in·the·previous·definition)·exists·before·attempting·to·read·the·associated153 in·the·previous·definition)·exists·before·attempting·to·read·the·associated
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166 <code·class="inline">{require,AliasName,CfgVarName}</code>.·The·arguments·<code·class="inline">AliasName</code>·and·<code·class="inline">CfgVarName</code>·are166 <code·class="inline">{require,AliasName,CfgVarName}</code>.·The·arguments·<code·class="inline">AliasName</code>·and·<code·class="inline">CfgVarName</code>·are
167 the·same·as·the·arguments·to·<a·href="ct.html#require/1"><code·class="inline">ct:require/1,2</code></a>.·<code·class="inline">AliasName</code>167 the·same·as·the·arguments·to·<a·href="ct.html#require/1"><code·class="inline">ct:require/1,2</code></a>.·<code·class="inline">AliasName</code>
168 becomes·an·alias·for·the·configuration·variable,·and·can·be·used·as·reference·to168 becomes·an·alias·for·the·configuration·variable,·and·can·be·used·as·reference·to
169 the·configuration·data·value.·The·configuration·variable·can·be·associated·with169 the·configuration·data·value.·The·configuration·variable·can·be·associated·with
170 any·number·of·alias·names,·but·each·name·must·be·unique·within·the·same·test170 any·number·of·alias·names,·but·each·name·must·be·unique·within·the·same·test
171 suite.·The·two·main·uses·for·alias·names·follows:</p><ul><li>To·identify·connections·(described·later).</li><li>To·help·adapt·configuration·data·to·a·test·suite·(or·test·case)·and·improve171 suite.·The·two·main·uses·for·alias·names·follows:</p><ul><li>To·identify·connections·(described·later).</li><li>To·help·adapt·configuration·data·to·a·test·suite·(or·test·case)·and·improve
172 readability.</li></ul><p>To·read·the·value·of·a·configuration·variable,·use·function172 readability.</li></ul><p>To·read·the·value·of·a·configuration·variable,·use·function
173 <a·href="ct.html#get_config/1"><code·class="inline">get_config/1,2,3</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="3691083245-1">(</span><span·class="p"·data-group-id="3691083245-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 <a·href="ct.html#get_config/1"><code·class="inline">get_config/1,2,3</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="6107873414-1">(</span><span·class="p"·data-group-id="6107873414-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ····</span><span·class="p"·data-group-id="3691083245-2">[</span><span·class="p"·data-group-id="3691083245-3">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;CO[·...·truncated·by·diffoscope;·len:·124,·SHA:·51802755a057b2d1725fd2d9d4e7afab512de3126d98f5c9bd47a4cf005a140d·...·]-2">]</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="p"·data-group-id="6107873414-2">[</span><span·class="p"·data-group-id="6107873414-3">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;CO[·...·truncated·by·diffoscope;·len:·124,·SHA:·f365d7cb1632cabd06330d0f91a2af1541a1b81c70c7321923c6ee7511181f9b·...·]-2">]</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">175 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
  
176 </span><span·class="nf">testcase</span><span·class="p"·data-group-id="3691083245-4">(</span><span·class="n">Config</span><span·class="p"·data-group-id="3691083245-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 </span><span·class="nf">testcase</span><span·class="p"·data-group-id="6107873414-4">(</span><span·class="n">Config</span><span·class="p"·data-group-id="6107873414-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ····</span><span·class="n">Domain</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="3691083245-5">(</span><span·class="ss">domain</span><span·class="p"·data-group-id="3691083245-5">)</span><span·class="p">,</span><span·class="w">177 ····</span><span·class="n">Domain</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="6107873414-5">(</span><span·class="ss">domain</span><span·class="p"·data-group-id="6107873414-5">)</span><span·class="p">,</span><span·class="w">
178 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="using-configuration-variables-defined-in-multiple-files"·class="section-heading">178 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="using-configuration-variables-defined-in-multiple-files"·class="section-heading">
179 ··<a·href="#using-configuration-variables-defined-in-multiple-files"·class="hover-link">179 ··<a·href="#using-configuration-variables-defined-in-multiple-files"·class="hover-link">
180 ····<i·class="ri-link-m"·aria-hidden="true"></i>180 ····<i·class="ri-link-m"·aria-hidden="true"></i>
181 ··</a>181 ··</a>
182 ··<span·class="text">Using·Configuration·Variables·Defined·in·Multiple·Files</span>182 ··<span·class="text">Using·Configuration·Variables·Defined·in·Multiple·Files</span>
183 </h2>183 </h2>
184 <p>If·a·configuration·variable·is·defined·in·multiple·files·and·you·want·to·access184 <p>If·a·configuration·variable·is·defined·in·multiple·files·and·you·want·to·access
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257 ···&lt;ftp_host&gt;257 ···&lt;ftp_host&gt;
258 ·······&lt;ftp&gt;&quot;targethost&quot;&lt;/ftp&gt;258 ·······&lt;ftp&gt;&quot;targethost&quot;&lt;/ftp&gt;
259 ·······&lt;username&gt;&quot;tester&quot;&lt;/username&gt;259 ·······&lt;username&gt;&quot;tester&quot;&lt;/username&gt;
260 ·······&lt;password&gt;&quot;letmein&quot;&lt;/password&gt;260 ·······&lt;password&gt;&quot;letmein&quot;&lt;/password&gt;
261 ···&lt;/ftp_host&gt;261 ···&lt;/ftp_host&gt;
262 ···&lt;lm_directory&gt;&quot;/test/loadmodules&quot;&lt;/lm_directory&gt;262 ···&lt;lm_directory&gt;&quot;/test/loadmodules&quot;&lt;/lm_directory&gt;
263 &lt;/config&gt;</code></pre><p>Once·read,·this·file·produces·the·same·configuration·variables·as·the·following263 &lt;/config&gt;</code></pre><p>Once·read,·this·file·produces·the·same·configuration·variables·as·the·following
264 text·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9487796392-1">{</span><span·class="ss">ftp_host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9487796392-2">[</span><span·class="p"·data-group-id="9487796392-3">{</span><span·class="ss">ftp</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·89,·SHA:·47f68838db4dcb21a0d60a697a035d0c6d263b240b5d8df28e3b44734de4b07a·...·]-3">}</span><span·class="p">,</span><span·class="w">264 text·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1351401470-1">{</span><span·class="ss">ftp_host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1351401470-2">[</span><span·class="p"·data-group-id="1351401470-3">{</span><span·class="ss">ftp</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·89,·SHA:·6ee3d177937955ee68f9ce492bed14752db708c33e5f99e8fff0c0e982cc7803·...·]-3">}</span><span·class="p">,</span><span·class="w">
265 ············</span><span·class="p"·data-group-id="9487796392-4">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="s">&quot;tester&quot;</span><span·class="p"·data-group-id="9487796392-4">}</span><span·class="p">,</span><span·class="w">265 ············</span><span·class="p"·data-group-id="1351401470-4">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="s">&quot;tester&quot;</span><span·class="p"·data-group-id="1351401470-4">}</span><span·class="p">,</span><span·class="w">
266 ············</span><span·class="p"·data-group-id="9487796392-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="s">&quot;letmein&quot;</span><span·class="p"·data-group-id="9487796392-5">}</span><span·class="p"·data-group-id="9487796392-2">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·0163bf47a4d66b47f37eafeec5f590af100b96753f84fa2fd7b72e830f22163e·...·]-1">}</span><span·class="p">.</span><span·class="w">266 ············</span><span·class="p"·data-group-id="1351401470-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="s">&quot;letmein&quot;</span><span·class="p"·data-group-id="1351401470-5">}</span><span·class="p"·data-group-id="1351401470-2">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·8181c36dcd448389fb3e264de45f3fb939fc4fd07ab30f77389c95db661c4927·...·]-1">}</span><span·class="p">.</span><span·class="w">
  
267 </span><span·class="p"·data-group-id="9487796392-6">{</span><span·class="ss">lm_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/test/loadmodules&quot;</span><span·class="p"·data-group-id="9487796392-6">}</span><span·class="p">.</span></code></pre><h3·id="implement-a-user-specific-handler"·class="section-heading">267 </span><span·class="p"·data-group-id="1351401470-6">{</span><span·class="ss">lm_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/test/loadmodules&quot;</span><span·class="p"·data-group-id="1351401470-6">}</span><span·class="p">.</span></code></pre><h3·id="implement-a-user-specific-handler"·class="section-heading">
268 ··<a·href="#implement-a-user-specific-handler"·class="hover-link">268 ··<a·href="#implement-a-user-specific-handler"·class="hover-link">
269 ····<i·class="ri-link-m"·aria-hidden="true"></i>269 ····<i·class="ri-link-m"·aria-hidden="true"></i>
270 ··</a>270 ··</a>
271 ··<span·class="text">Implement·a·User-Specific·Handler</span>271 ··<span·class="text">Implement·a·User-Specific·Handler</span>
272 </h3>272 </h3>
273 <p>The·user-specific·handler·can·be·written·to·handle·special·configuration·file273 <p>The·user-specific·handler·can·be·written·to·handle·special·configuration·file
274 formats.·The·parameter·can·be·either·file·names·or·configuration·strings·(the274 formats.·The·parameter·can·be·either·file·names·or·configuration·strings·(the
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280 specified·configuration·parameter·is·valid:</p><ul><li><code·class="inline">{ok,·{file,·FileName}}</code>·-·the·parameter·is·a·file·name·and·the·file·exists.</li><li><code·class="inline">{ok,·{config,·ConfigString}}</code>·-·the·parameter·is·a·configuration·string·and280 specified·configuration·parameter·is·valid:</p><ul><li><code·class="inline">{ok,·{file,·FileName}}</code>·-·the·parameter·is·a·file·name·and·the·file·exists.</li><li><code·class="inline">{ok,·{config,·ConfigString}}</code>·-·the·parameter·is·a·configuration·string·and
281 it·is·correct.</li><li><code·class="inline">{error,·{nofile,·FileName}}</code>·-·there·is·no·file·with·the·specified·name·in281 it·is·correct.</li><li><code·class="inline">{error,·{nofile,·FileName}}</code>·-·there·is·no·file·with·the·specified·name·in
282 the·current·directory.</li><li><code·class="inline">{error,·{wrong_config,·ConfigString}}</code>·-·the·configuration·string·is·wrong.</li></ul><p>The·function·<code·class="inline">Callback:read_config/1</code>·is·to·be·exported·from·the·callback·module282 the·current·directory.</li><li><code·class="inline">{error,·{wrong_config,·ConfigString}}</code>·-·the·configuration·string·is·wrong.</li></ul><p>The·function·<code·class="inline">Callback:read_config/1</code>·is·to·be·exported·from·the·callback·module
283 to·read·configuration·data,·initially·before·the·tests·start,·or·as·a·result·of283 to·read·configuration·data,·initially·before·the·tests·start,·or·as·a·result·of
284 data·being·reloaded·during·test·execution.·The·input·argument·is·the·same·as·for284 data·being·reloaded·during·test·execution.·The·input·argument·is·the·same·as·for
285 function·<code·class="inline">check_parameter/1</code>.</p><p>The·return·value·is·to·be·either·of·the·following:</p><ul><li><code·class="inline">{ok,·Config}</code>·-·if·the·configuration·variables·are·read·successfully.</li><li><code·class="inline">{error,·{Error,·ErrorDetails}}</code>·-·if·the·callback·module·fails·to·proceed285 function·<code·class="inline">check_parameter/1</code>.</p><p>The·return·value·is·to·be·either·of·the·following:</p><ul><li><code·class="inline">{ok,·Config}</code>·-·if·the·configuration·variables·are·read·successfully.</li><li><code·class="inline">{error,·{Error,·ErrorDetails}}</code>·-·if·the·callback·module·fails·to·proceed
286 with·the·specified·configuration·parameters.</li></ul><p><code·class="inline">Config</code>·is·the·proper·Erlang·key-value·list,·with·possible·key-value·sublists286 with·the·specified·configuration·parameters.</li></ul><p><code·class="inline">Config</code>·is·the·proper·Erlang·key-value·list,·with·possible·key-value·sublists
287 as·values,·like·the·earlier·configuration·file·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1993477862-1">[</span><span·class="p"·data-group-id="1993477862-2">{</span><span·class="ss">ftp_host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1993477862-3">[</span><span·class="p"·data-group-id="1993477862-4">{</[·...·truncated·by·diffoscope;·len:·823,·SHA:·4eed4ea56929650242f6fe0f37d55435be02d5774ff62d7584929e9709a29e84·...·]-2">}</span><span·class="p">,</span><span·class="w">287 as·values,·like·the·earlier·configuration·file·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2456862861-1">[</span><span·class="p"·data-group-id="2456862861-2">{</span><span·class="ss">ftp_host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2456862861-3">[</span><span·class="p"·data-group-id="2456862861-4">{</[·...·truncated·by·diffoscope;·len:·823,·SHA:·5f95da7b86882c3e4266fb013ffa730dd864beeb0306da883bd1044a7a5baa9d·...·]-2">}</span><span·class="p">,</span><span·class="w">
288 ·</span><span·class="p"·data-group-id="1993477862-7">{</span><span·class="ss">lm_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/test/loadmodules&quot;</span><span·class="p"·data-group-id="1993477862-7">}</span><span·class="p"·data-group-id="1993477862-1">]</span></code></pre><h2·id="examples-of-configuration-data-handling"·class="section-heading">288 ·</span><span·class="p"·data-group-id="2456862861-7">{</span><span·class="ss">lm_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/test/loadmodules&quot;</span><span·class="p"·data-group-id="2456862861-7">}</span><span·class="p"·data-group-id="2456862861-1">]</span></code></pre><h2·id="examples-of-configuration-data-handling"·class="section-heading">
289 ··<a·href="#examples-of-configuration-data-handling"·class="hover-link">289 ··<a·href="#examples-of-configuration-data-handling"·class="hover-link">
290 ····<i·class="ri-link-m"·aria-hidden="true"></i>290 ····<i·class="ri-link-m"·aria-hidden="true"></i>
291 ··</a>291 ··</a>
292 ··<span·class="text">Examples·of·Configuration·Data·Handling</span>292 ··<span·class="text">Examples·of·Configuration·Data·Handling</span>
293 </h2>293 </h2>
294 <p>A·configuration·file·for·using·the·FTP·client·to·access·files·on·a·remote·host294 <p>A·configuration·file·for·using·the·FTP·client·to·access·files·on·a·remote·host
295 can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7861269933-1">{</span><span·class="ss">ftp_host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7861269933-2">[</span><span·class="p"·data-group-id="7861269933-3">{</span><span·class="ss">ftp</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·2de2850934a21167221c944359b024fa4a6a026b3bbf1ec168eeb1d8c7579754·...·]3-3">}</span><span·class="p">,</span><span·class="w">295 can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8855952043-1">{</span><span·class="ss">ftp_host</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8855952043-2">[</span><span·class="p"·data-group-id="8855952043-3">{</span><span·class="ss">ftp</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·b831f6af75b140a4a110c2877876b31eb78198ee9c22cec123c6898a5a81df90·...·]3-3">}</span><span·class="p">,</span><span·class="w">
296 ············</span><span·class="p"·data-group-id="7861269933-4">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="s">&quot;tester&quot;</span><span·class="p"·data-group-id="7861269933-4">}</span><span·class="p">,</span><span·class="w">296 ············</span><span·class="p"·data-group-id="8855952043-4">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="s">&quot;tester&quot;</span><span·class="p"·data-group-id="8855952043-4">}</span><span·class="p">,</span><span·class="w">
297 ············</span><span·class="p"·data-group-id="7861269933-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="s">&quot;letmein&quot;</span><span·class="p"·data-group-id="7861269933-5">}</span><span·class="p"·data-group-id="7861269933-2">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·10,·SHA:·571188d7767c57c2259fd1dc78b9d3bdf44eb1e7743b5078966107248c61b0b6·...·]3-1">}</span><span·class="p">.</span><span·class="w">297 ············</span><span·class="p"·data-group-id="8855952043-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="s">&quot;letmein&quot;</span><span·class="p"·data-group-id="8855952043-5">}</span><span·class="p"·data-group-id="8855952043-2">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·10,·SHA:·a36c0cabe808331c675c24c853716b616d594c0f84d22bd48fb5ceb10d2d5c02·...·]3-1">}</span><span·class="p">.</span><span·class="w">
  
298 </span><span·class="p"·data-group-id="7861269933-6">{</span><span·class="ss">lm_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/test/loadmodules&quot;</span><span·class="p"·data-group-id="7861269933-6">}</span><span·class="p">.</span></code></pre><p>The·XML·version·shown·earlier·can·also·be·used,·but·it·is·to·be·explicitly298 </span><span·class="p"·data-group-id="8855952043-6">{</span><span·class="ss">lm_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/test/loadmodules&quot;</span><span·class="p"·data-group-id="8855952043-6">}</span><span·class="p">.</span></code></pre><p>The·XML·version·shown·earlier·can·also·be·used,·but·it·is·to·be·explicitly
299 specified·that·the·<code·class="inline">ct_config_xml</code>·callback·module·is·to·be·used·by299 specified·that·the·<code·class="inline">ct_config_xml</code>·callback·module·is·to·be·used·by
300 <code·class="inline">Common·Test</code>.</p><p>The·following·is·an·example·of·how·to·assert·that·the·configuration·data·is300 <code·class="inline">Common·Test</code>.</p><p>The·following·is·an·example·of·how·to·assert·that·the·configuration·data·is
301 available·and·can·be·used·for·an·FTP·session:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="1674281648-1">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="1674281648-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">301 available·and·can·be·used·for·an·FTP·session:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="3033336064-1">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="3033336064-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
302 ····</span><span·class="p"·data-group-id="1674281648-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="1674281648-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span><span[·...·truncated·by·diffoscope;·len:·168,·SHA:·4c6ca8338c915a51f55b14dbf307c2e432f3a4d2be72b96538ef1f0d86587ab4·...·]-3">)</span><span·class="p">,</span><span·class="w">302 ····</span><span·class="p"·data-group-id="3033336064-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="3033336064-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span><span[·...·truncated·by·diffoscope;·len:·168,·SHA:·571debe9b0a7358e66368e843b3dcd814dc979895521c37d4479f92381448a36·...·]-3">)</span><span·class="p">,</span><span·class="w">
303 ····</span><span·class="n">Config</span><span·class="p">.</span><span·class="w">303 ····</span><span·class="n">Config</span><span·class="p">.</span><span·class="w">
  
304 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="1674281648-4">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Config</span><span·class="p"·data-group-id="1674281648-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">304 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="3033336064-4">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Config</span><span·class="p"·data-group-id="3033336064-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
305 ····</span><span·class="nc">ct_ftp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1674281648-5">(</span><span·class="ss">ftp</span><span·class="p"·data-group-id="1674281648-5">)</span><span·class="p">.</span><span·class="w">305 ····</span><span·class="nc">ct_ftp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3033336064-5">(</span><span·class="ss">ftp</span><span·class="p"·data-group-id="3033336064-5">)</span><span·class="p">.</span><span·class="w">
  
306 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="1674281648-6">(</span><span·class="p"·data-group-id="1674281648-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">306 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="3033336064-6">(</span><span·class="p"·data-group-id="3033336064-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
307 ····</span><span·class="p"·data-group-id="1674281648-7">[</span><span·class="p"·data-group-id="1674281648-8">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="ss">ftp_host</span><span·class="p"·data-group-id="1674281648-8">}</span><span·class="p">,</span><span·class="w">307 ····</span><span·class="p"·data-group-id="3033336064-7">[</span><span·class="p"·data-group-id="3033336064-8">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="ss">ftp_host</span><span·class="p"·data-group-id="3033336064-8">}</span><span·class="p">,</span><span·class="w">
308 ·····</span><span·class="p"·data-group-id="1674281648-9">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="1674281648-9">}</span><span·class="p"·data-group-id="1674281648-7">]</span><span·class="p">.</span><span·class="w">308 ·····</span><span·class="p"·data-group-id="3033336064-9">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="3033336064-9">}</span><span·class="p"·data-group-id="3033336064-7">]</span><span·class="p">.</span><span·class="w">
  
309 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="1674281648-10">(</span><span·class="n">Config</span><span·class="p"·data-group-id="1674281648-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">309 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="3033336064-10">(</span><span·class="n">Config</span><span·class="p"·data-group-id="3033336064-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
310 ····</span><span·class="n">Remote</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="1674281648-11">(</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="1674281648-12">(</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="1674281648-12">)</span><span[·...·truncated·by·diffoscope;·len:·127,·SHA:·3dca4d0077ac72c3124616da9ae32e09dfa4af3b4bfd556d72befa930e6b9e4a·...·]-11">)</span><span·class="p">,</span><span·class="w">310 ····</span><span·class="n">Remote</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="3033336064-11">(</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="3033336064-12">(</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="3033336064-12">)</span><span[·...·truncated·by·diffoscope;·len:·127,·SHA:·7e6700e78569c7442b808f670393a6b1df2bf4a810729782bd1fac09a0b5196a·...·]-11">)</span><span·class="p">,</span><span·class="w">
311 ····</span><span·class="n">Local</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="1674281648-13">(</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="1674281648-14">(</span><span·class="ss">priv_dir</span><span·class="p">,</span><span·class="n">Config</span><spa[·...·truncated·by·diffoscope;·len:·184,·SHA:·96bc0fec4af385bdf11edf0ff2b26625e888b34c38e87bd15d4f8cece2dacc4c·...·]-13">)</span><span·class="p">,</span><span·class="w">311 ····</span><span·class="n">Local</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="3033336064-13">(</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="3033336064-14">(</span><span·class="ss">priv_dir</span><span·class="p">,</span><span·class="n">Config</span><spa[·...·truncated·by·diffoscope;·len:·184,·SHA:·080226aab6340829552c416481d78459a7af91dc7cf01a0f1aa1cb0906df5099·...·]-13">)</span><span·class="p">,</span><span·class="w">
312 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="1674281648-15">(</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Remote</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Local</span><span·class="p"·data-group-id="1674281648-15">)</span><span·class="p">,</span><span·class="w">312 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="3033336064-15">(</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Remote</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Local</span><span·class="p"·data-group-id="3033336064-15">)</span><span·class="p">,</span><span·class="w">
313 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>The·following·is·an·example·of·how·the·functions·in·the·previous·example·can·be313 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>The·following·is·an·example·of·how·the·functions·in·the·previous·example·can·be
314 rewritten·if·it·is·necessary·to·open·multiple·connections·to·the·FTP·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="0832116182-1">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="0832116182-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">314 rewritten·if·it·is·necessary·to·open·multiple·connections·to·the·FTP·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="0119903995-1">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="0119903995-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
315 ····</span><span·class="p"·data-group-id="0832116182-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Handle1</span><span·class="p"·data-group-id="0832116182-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span>[·...·truncated·by·diffoscope;·len:·178,·SHA:·cc1d8448084c303a4b17fa3158e5049171cb5fe34ce578804e55c886cbf27f6d·...·]-3">)</span><span·class="p">,</span><span·class="w">315 ····</span><span·class="p"·data-group-id="0119903995-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Handle1</span><span·class="p"·data-group-id="0119903995-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span>[·...·truncated·by·diffoscope;·len:·178,·SHA:·4f82c1e7251df59bc2b66cf1216233f0ac81035a704543eaa9758ab67727aeb6·...·]-3">)</span><span·class="p">,</span><span·class="w">
316 ····</span><span·class="p"·data-group-id="0832116182-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Handle2</span><span·class="p"·data-group-id="0832116182-4">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span>[·...·truncated·by·diffoscope;·len:·178,·SHA:·790c17f77b9156a083591190ee24ac5d1c1421de7cb8891c0d3fcacd02f11bcf·...·]-5">)</span><span·class="p">,</span><span·class="w">316 ····</span><span·class="p"·data-group-id="0119903995-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Handle2</span><span·class="p"·data-group-id="0119903995-4">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span>[·...·truncated·by·diffoscope;·len:·178,·SHA:·d40ac8efb4168806819a404eb575696fc47e274aba5f31cb258ca8d5b272cfda·...·]-5">)</span><span·class="p">,</span><span·class="w">
317 ····</span><span·class="p"·data-group-id="0832116182-6">[</span><span·class="p"·data-group-id="0832116182-7">{</span><span·class="ss">ftp_handles</span><span·class="p">,</span><span·class="p"·data-group-id="0832116182-8">[</span><span·class="n">Handle1</span><span·class="p">,</span><span·class="n">[·...·truncated·by·diffoscope;·len:·262,·SHA:·68ccb7f1c7487ce11de44a3d224659dd8bd521774f83243dbd5870501fb97822·...·]-6">]</span><span·class="p">.</span><span·class="w">317 ····</span><span·class="p"·data-group-id="0119903995-6">[</span><span·class="p"·data-group-id="0119903995-7">{</span><span·class="ss">ftp_handles</span><span·class="p">,</span><span·class="p"·data-group-id="0119903995-8">[</span><span·class="n">Handle1</span><span·class="p">,</span><span·class="n">[·...·truncated·by·diffoscope;·len:·262,·SHA:·d86b1dbdfe1dec667b31e9e6c523909fcf4ff095a9562b25a4ba17fb3c5045d2·...·]-6">]</span><span·class="p">.</span><span·class="w">
  
318 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="0832116182-9">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="0832116182-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">318 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="0119903995-9">(</span><span·class="ss">ftptest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="0119903995-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
319 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foreach</span><span·class="p"·data-group-id="0832116182-10">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0832116182-11">(</span><span·class="n">Handle</span><span·class="p"·data-group-id="0832116182-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·213,·SHA:·005c378b71492705427f5645d398d5109f6a6c9f2b0a0a89ef7f0c6b3b9f5671·...·]-12">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">319 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foreach</span><span·class="p"·data-group-id="0119903995-10">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0119903995-11">(</span><span·class="n">Handle</span><span·class="p"·data-group-id="0119903995-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·213,·SHA:·f9d1fa7ef36ee2f468eae108568032678c45bb87a554ffa1908ab81d94ebdccb·...·]-12">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
320 ··················</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="0832116182-13">(</span><span·class="ss">ftp_handles</span><span·class="p">,</span><span·class="n">Config</span><span·class="p"·data-group-id="0832116182-13">)</span><span·class="p"·data-group-id="0832116182-10">)</span><span·class="p">.</span><span·class="w">320 ··················</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="0119903995-13">(</span><span·class="ss">ftp_handles</span><span·class="p">,</span><span·class="n">Config</span><span·class="p"·data-group-id="0119903995-13">)</span><span·class="p"·data-group-id="0119903995-10">)</span><span·class="p">.</span><span·class="w">
  
321 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="0832116182-14">(</span><span·class="p"·data-group-id="0832116182-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">321 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="0119903995-14">(</span><span·class="p"·data-group-id="0119903995-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
322 ····</span><span·class="p"·data-group-id="0832116182-15">[</span><span·class="p"·data-group-id="0832116182-16">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">ftp_host</span><span·class="p"·data-group-id="0832116182-16">}</span><span·class="p">,</span><span·class="w">322 ····</span><span·class="p"·data-group-id="0119903995-15">[</span><span·class="p"·data-group-id="0119903995-16">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">ftp_host</span><span·class="p"·data-group-id="0119903995-16">}</span><span·class="p">,</span><span·class="w">
323 ·····</span><span·class="p"·data-group-id="0832116182-17">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="0832116182-17">}</span><span·class="p"·data-group-id="0832116182-15">]</span><span·class="p">.</span><span·class="w">323 ·····</span><span·class="p"·data-group-id="0119903995-17">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="0119903995-17">}</span><span·class="p"·data-group-id="0119903995-15">]</span><span·class="p">.</span><span·class="w">
  
324 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="0832116182-18">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0832116182-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">324 </span><span·class="nf">ftptest</span><span·class="p"·data-group-id="0119903995-18">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0119903995-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
325 ····</span><span·class="n">Remote</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="0832116182-19">(</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="0832116182-20">(</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="0832116182-20">)</span><span·[·...·truncated·by·diffoscope;·len:·126,·SHA:·04e9e5dc0713d633126a63f7898b853891010e6c41a7e633bd90b4d7e53cc133·...·]-19">)</span><span·class="p">,</span><span·class="w">325 ····</span><span·class="n">Remote</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="0119903995-19">(</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="0119903995-20">(</span><span·class="ss">lm_directory</span><span·class="p"·data-group-id="0119903995-20">)</span><span·[·...·truncated·by·diffoscope;·len:·126,·SHA:·99f49d60a48c4b87f67840b0dbbefefb12965f9f5950727c4f3b8c8bd34a5423·...·]-19">)</span><span·class="p">,</span><span·class="w">
326 ····</span><span·class="n">Local</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="0832116182-21">(</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="0832116182-22">(</span><span·class="ss">priv_dir</span><span·class="p">,</span><span·class="n">Config</span><span[·...·truncated·by·diffoscope;·len:·183,·SHA:·4734033f474595a14d50e184bf957e211bf91163861c9b0b139518c05dda8561·...·]-21">)</span><span·class="p">,</span><span·class="w">326 ····</span><span·class="n">Local</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="0119903995-21">(</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="0119903995-22">(</span><span·class="ss">priv_dir</span><span·class="p">,</span><span·class="n">Config</span><span[·...·truncated·by·diffoscope;·len:·183,·SHA:·af5b905c0724e89a2bdab8f061ddd20fcba19bbd179f80a5ff7f4f05aa9bb2dd·...·]-21">)</span><span·class="p">,</span><span·class="w">
327 ····</span><span·class="p"·data-group-id="0832116182-23">[</span><span·class="n">Handle</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">MoreHandles</span><span·class="p"·data-group-id="0832116182-23">]</span><span·class="w">·</span><span·class="o">=</sp[·...·truncated·by·diffoscope;·len:·300,·SHA:·261cd547353bfe595a216e824131afd0bde2a7ea0818afcf3402abaace75cb05·...·]-24">)</span><span·class="p">,</span><span·class="w">327 ····</span><span·class="p"·data-group-id="0119903995-23">[</span><span·class="n">Handle</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">MoreHandles</span><span·class="p"·data-group-id="0119903995-23">]</span><span·class="w">·</span><span·class="o">=</sp[·...·truncated·by·diffoscope;·len:·300,·SHA:·f569bfaaf34329b373a71fd3eb77acf49fd8464fefd07884dbe7f123695523ca·...·]-24">)</span><span·class="p">,</span><span·class="w">
328 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="0832116182-25">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Remote</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Local</span><span·class="p"·data-group-id="0832116182-25">)</span><span·class="p">,</span><span·class="w">328 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct_ftp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="0119903995-25">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Remote</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Local</span><span·class="p"·data-group-id="0119903995-25">)</span><span·class="p">,</span><span·class="w">
329 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="example-of-user-specific-configuration-handler"·class="section-heading">329 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="example-of-user-specific-configuration-handler"·class="section-heading">
330 ··<a·href="#example-of-user-specific-configuration-handler"·class="hover-link">330 ··<a·href="#example-of-user-specific-configuration-handler"·class="hover-link">
331 ····<i·class="ri-link-m"·aria-hidden="true"></i>331 ····<i·class="ri-link-m"·aria-hidden="true"></i>
332 ··</a>332 ··</a>
333 ··<span·class="text">Example·of·User-Specific·Configuration·Handler</span>333 ··<span·class="text">Example·of·User-Specific·Configuration·Handler</span>
334 </h2>334 </h2>
335 <p>A·simple·configuration·handling·driver,·asking·an·external·server·for335 <p>A·simple·configuration·handling·driver,·asking·an·external·server·for
336 configuration·data,·can·be·implemented·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3202338380-1">(</span><span·class="ss">config_driver</span><span·class="p"·data-group-id="3202338380-1">)</span><span·class="p">.</span><span·class="w">336 configuration·data,·can·be·implemented·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1658006427-1">(</span><span·class="ss">config_driver</span><span·class="p"·data-group-id="1658006427-1">)</span><span·class="p">.</span><span·class="w">
337 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3202338380-2">(</span><span·class="p"·data-group-id="3202338380-3">[</span><span·class="ss">read_config</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">check_parameter</span><span·clas[·...·truncated·by·diffoscope;·len:·133,·SHA:·9d217c80dbeb2a235c812ff071fd3f4d882f7501fa116d643039b0fc3bfad3db·...·]-2">)</span><span·class="p">.</span><span·class="w">337 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1658006427-2">(</span><span·class="p"·data-group-id="1658006427-3">[</span><span·class="ss">read_config</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">check_parameter</span><span·clas[·...·truncated·by·diffoscope;·len:·133,·SHA:·a929ebf1b71f97670aa58b98f6599770c213eb99a50aeede668680058728f92c·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
338 </span><span·class="nf">read_config</span><span·class="p"·data-group-id="3202338380-4">(</span><span·class="n">ServerName</span><span·class="p"·data-group-id="3202338380-4">)</span><span·class="p">-&gt;</span><span·class="w">338 </span><span·class="nf">read_config</span><span·class="p"·data-group-id="1658006427-4">(</span><span·class="n">ServerName</span><span·class="p"·data-group-id="1658006427-4">)</span><span·class="p">-&gt;</span><span·class="w">
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197 ····<i·class="ri-link-m"·aria-hidden="true"></i>197 ····<i·class="ri-link-m"·aria-hidden="true"></i>
198 ··</a>198 ··</a>
199 ··<span·class="text">General·Config</span>199 ··<span·class="text">General·Config</span>
200 </h3>200 </h3>
201 <p>Here·follows·the·general·configuration·terms·that·are·allowed·in·a·cover201 <p>Here·follows·the·general·configuration·terms·that·are·allowed·in·a·cover
202 specification·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·List·of·Nodes·on·which·cover·will·be·active·during·test.</span><span·class="w">202 specification·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·List·of·Nodes·on·which·cover·will·be·active·during·test.</span><span·class="w">
203 </span><span·class="c1">%%·Nodes·=·[atom()]</span><span·class="w">203 </span><span·class="c1">%%·Nodes·=·[atom()]</span><span·class="w">
204 </span><span·class="p"·data-group-id="2802332972-1">{</span><span·class="nb">nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Nodes</span><span·class="p"·data-group-id="2802332972-1">}</span><span·class="p">.</span><span·class="w">204 </span><span·class="p"·data-group-id="8172376525-1">{</span><span·class="nb">nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Nodes</span><span·class="p"·data-group-id="8172376525-1">}</span><span·class="p">.</span><span·class="w">
  
205 </span><span·class="c1">%%·Files·with·previously·exported·cover·data·to·include·in·analysis.</span><span·class="w">205 </span><span·class="c1">%%·Files·with·previously·exported·cover·data·to·include·in·analysis.</span><span·class="w">
206 </span><span·class="c1">%%·CoverDataFiles·=·[string()]</span><span·class="w">206 </span><span·class="c1">%%·CoverDataFiles·=·[string()]</span><span·class="w">
207 </span><span·class="p"·data-group-id="2802332972-2">{</span><span·class="ss">import</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CoverDataFiles</span><span·class="p"·data-group-id="2802332972-2">}</span><span·class="p">.</span><span·class="w">207 </span><span·class="p"·data-group-id="8172376525-2">{</span><span·class="ss">import</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CoverDataFiles</span><span·class="p"·data-group-id="8172376525-2">}</span><span·class="p">.</span><span·class="w">
  
208 </span><span·class="c1">%%·Cover·data·file·to·export·from·this·session.</span><span·class="w">208 </span><span·class="c1">%%·Cover·data·file·to·export·from·this·session.</span><span·class="w">
209 </span><span·class="c1">%%·CoverDataFile·=·string()</span><span·class="w">209 </span><span·class="c1">%%·CoverDataFile·=·string()</span><span·class="w">
210 </span><span·class="p"·data-group-id="2802332972-3">{</span><span·class="ss">export</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CoverDataFile</span><span·class="p"·data-group-id="2802332972-3">}</span><span·class="p">.</span><span·class="w">210 </span><span·class="p"·data-group-id="8172376525-3">{</span><span·class="ss">export</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CoverDataFile</span><span·class="p"·data-group-id="8172376525-3">}</span><span·class="p">.</span><span·class="w">
  
211 </span><span·class="c1">%%·Cover·analysis·level.</span><span·class="w">211 </span><span·class="c1">%%·Cover·analysis·level.</span><span·class="w">
212 </span><span·class="c1">%%·Level·=·details·|·overview</span><span·class="w">212 </span><span·class="c1">%%·Level·=·details·|·overview</span><span·class="w">
213 </span><span·class="p"·data-group-id="2802332972-4">{</span><span·class="ss">level</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Level</span><span·class="p"·data-group-id="2802332972-4">}</span><span·class="p">.</span><span·class="w">213 </span><span·class="p"·data-group-id="8172376525-4">{</span><span·class="ss">level</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Level</span><span·class="p"·data-group-id="8172376525-4">}</span><span·class="p">.</span><span·class="w">
  
214 </span><span·class="c1">%%·Directories·to·include·in·cover.</span><span·class="w">214 </span><span·class="c1">%%·Directories·to·include·in·cover.</span><span·class="w">
215 </span><span·class="c1">%%·Dirs·=·[string()]</span><span·class="w">215 </span><span·class="c1">%%·Dirs·=·[string()]</span><span·class="w">
216 </span><span·class="p"·data-group-id="2802332972-5">{</span><span·class="ss">incl_dirs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="2802332972-5">}</span><span·class="p">.</span><span·class="w">216 </span><span·class="p"·data-group-id="8172376525-5">{</span><span·class="ss">incl_dirs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="8172376525-5">}</span><span·class="p">.</span><span·class="w">
  
217 </span><span·class="c1">%%·Directories,·including·subdirectories,·to·include.</span><span·class="w">217 </span><span·class="c1">%%·Directories,·including·subdirectories,·to·include.</span><span·class="w">
218 </span><span·class="p"·data-group-id="2802332972-6">{</span><span·class="ss">incl_dirs_r</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="2802332972-6">}</span><span·class="p">.</span><span·class="w">218 </span><span·class="p"·data-group-id="8172376525-6">{</span><span·class="ss">incl_dirs_r</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="8172376525-6">}</span><span·class="p">.</span><span·class="w">
  
219 </span><span·class="c1">%%·Specific·modules·to·include·in·cover.</span><span·class="w">219 </span><span·class="c1">%%·Specific·modules·to·include·in·cover.</span><span·class="w">
220 </span><span·class="c1">%%·Mods·=·[atom()]</span><span·class="w">220 </span><span·class="c1">%%·Mods·=·[atom()]</span><span·class="w">
221 </span><span·class="p"·data-group-id="2802332972-7">{</span><span·class="ss">incl_mods</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mods</span><span·class="p"·data-group-id="2802332972-7">}</span><span·class="p">.</span><span·class="w">221 </span><span·class="p"·data-group-id="8172376525-7">{</span><span·class="ss">incl_mods</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mods</span><span·class="p"·data-group-id="8172376525-7">}</span><span·class="p">.</span><span·class="w">
  
222 </span><span·class="c1">%%·Directories·to·exclude·in·cover.</span><span·class="w">222 </span><span·class="c1">%%·Directories·to·exclude·in·cover.</span><span·class="w">
223 </span><span·class="p"·data-group-id="2802332972-8">{</span><span·class="ss">excl_dirs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="2802332972-8">}</span><span·class="p">.</span><span·class="w">223 </span><span·class="p"·data-group-id="8172376525-8">{</span><span·class="ss">excl_dirs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="8172376525-8">}</span><span·class="p">.</span><span·class="w">
  
224 </span><span·class="c1">%%·Directories,·including·subdirectories,·to·exclude.</span><span·class="w">224 </span><span·class="c1">%%·Directories,·including·subdirectories,·to·exclude.</span><span·class="w">
225 </span><span·class="p"·data-group-id="2802332972-9">{</span><span·class="ss">excl_dirs_r</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="2802332972-9">}</span><span·class="p">.</span><span·class="w">225 </span><span·class="p"·data-group-id="8172376525-9">{</span><span·class="ss">excl_dirs_r</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dirs</span><span·class="p"·data-group-id="8172376525-9">}</span><span·class="p">.</span><span·class="w">
  
226 </span><span·class="c1">%%·Specific·modules·to·exclude·in·cover.</span><span·class="w">226 </span><span·class="c1">%%·Specific·modules·to·exclude·in·cover.</span><span·class="w">
227 </span><span·class="p"·data-group-id="2802332972-10">{</span><span·class="ss">excl_mods</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mods</span><span·class="p"·data-group-id="2802332972-10">}</span><span·class="p">.</span><span·class="w">227 </span><span·class="p"·data-group-id="8172376525-10">{</span><span·class="ss">excl_mods</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mods</span><span·class="p"·data-group-id="8172376525-10">}</span><span·class="p">.</span><span·class="w">
  
228 </span><span·class="c1">%%·Cross·cover·compilation</span><span·class="w">228 </span><span·class="c1">%%·Cross·cover·compilation</span><span·class="w">
229 </span><span·class="c1">%%·Tag·=·atom(),·an·identifier·for·a·test·run</span><span·class="w">229 </span><span·class="c1">%%·Tag·=·atom(),·an·identifier·for·a·test·run</span><span·class="w">
230 </span><span·class="c1">%%·Mod·=·[atom()],·modules·to·compile·for·accumulated·analysis</span><span·class="w">230 </span><span·class="c1">%%·Mod·=·[atom()],·modules·to·compile·for·accumulated·analysis</span><span·class="w">
231 </span><span·class="p"·data-group-id="2802332972-11">{</span><span·class="ss">cross</span><span·class="p">,</span><span·class="p"·data-group-id="2802332972-12">[</span><span·class="p"·data-group-id="2802332972-13">{</span><span·class="n">Tag</span><span·class="p">,</span><span·class="n">Mods</[·...·truncated·by·diffoscope;·len:·154,·SHA:·bb3e49d790338b7e0d43d68aef4d4a0189907f2fafb369a481bfff3c85cf7da1·...·]-11">}</span><span·class="p">.</span></code></pre><p>The·terms·<code·class="inline">incl_dirs_r</code>·and·<code·class="inline">excl_dirs_r</code>·tell·<code·class="inline">Common·Test</code>·to·search·the231 </span><span·class="p"·data-group-id="8172376525-11">{</span><span·class="ss">cross</span><span·class="p">,</span><span·class="p"·data-group-id="8172376525-12">[</span><span·class="p"·data-group-id="8172376525-13">{</span><span·class="n">Tag</span><span·class="p">,</span><span·class="n">Mods</[·...·truncated·by·diffoscope;·len:·154,·SHA:·e80caa1a410a2e994b5631d326a04bd6a32f4df9f27f7d8db0c611b68b6a524b·...·]-11">}</span><span·class="p">.</span></code></pre><p>The·terms·<code·class="inline">incl_dirs_r</code>·and·<code·class="inline">excl_dirs_r</code>·tell·<code·class="inline">Common·Test</code>·to·search·the
232 specified·directories·recursively·and·include·or·exclude·any·module·found·during232 specified·directories·recursively·and·include·or·exclude·any·module·found·during
233 the·search.·The·terms·<code·class="inline">incl_dirs</code>·and·<code·class="inline">excl_dirs</code>·result·in·a·non-recursive233 the·search.·The·terms·<code·class="inline">incl_dirs</code>·and·<code·class="inline">excl_dirs</code>·result·in·a·non-recursive
234 search·for·modules·(that·is,·only·modules·found·in·the·specified·directories·are234 search·for·modules·(that·is,·only·modules·found·in·the·specified·directories·are
235 included·or·excluded).</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Directories·containing·Erlang·modules·to·be·included·in·a·code·coverage·test235 included·or·excluded).</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Directories·containing·Erlang·modules·to·be·included·in·a·code·coverage·test
236 must·exist·in·the·code·server·path.·Otherwise,·the·Cover·tool·fails·to236 must·exist·in·the·code·server·path.·Otherwise,·the·Cover·tool·fails·to
237 recompile·the·modules.·It·is·not·sufficient·to·specify·these·directories·in237 recompile·the·modules.·It·is·not·sufficient·to·specify·these·directories·in
238 the·cover·specification·file·for·<code·class="inline">Common·Test</code>.</p></section><h3·id="otp-application-config"·class="section-heading">238 the·cover·specification·file·for·<code·class="inline">Common·Test</code>.</p></section><h3·id="otp-application-config"·class="section-heading">
239 ··<a·href="#otp-application-config"·class="hover-link">239 ··<a·href="#otp-application-config"·class="hover-link">
240 ····<i·class="ri-link-m"·aria-hidden="true"></i>240 ····<i·class="ri-link-m"·aria-hidden="true"></i>
241 ··</a>241 ··</a>
242 ··<span·class="text">OTP·application·Config</span>242 ··<span·class="text">OTP·application·Config</span>
243 </h3>243 </h3>
244 <p>When·using·a·cover·specification·in·the·testing·of·an·OTP·application·itself,244 <p>When·using·a·cover·specification·in·the·testing·of·an·OTP·application·itself,
245 there·is·a·special·incl_app·directive·that·includes·the·applications·modules·for245 there·is·a·special·incl_app·directive·that·includes·the·applications·modules·for
246 the·cover·compilation.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6777140355-1">{</span><span·class="ss">incl_app</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cover</span><span·class="w">·</span><span·class="p">:</span>[·...·truncated·by·diffoscope;·len:·224,·SHA:·7183166ac5310781c6ba6dbe5757c35cef3b33432aae4a0febb0c0004e2e4893·...·]-1">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·you·desire·to·also·use·some·other·general·cover·configuration·together·with246 the·cover·compilation.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2644406784-1">{</span><span·class="ss">incl_app</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cover</span><span·class="w">·</span><span·class="p">:</span>[·...·truncated·by·diffoscope;·len:·224,·SHA:·8d8ae45c56713356daf1c390a58e64400ec27852a89ec6d824262e09ce127169·...·]-1">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·you·desire·to·also·use·some·other·general·cover·configuration·together·with
247 this·option·you·should·insert·the·AppName·in·between·the·option·and·its·value247 this·option·you·should·insert·the·AppName·in·between·the·option·and·its·value
248 creating·a·three·tuple.</p></section><p><a·href=""·id="cross_cover"></a></p><h2·id="cross-cover-analysis"·class="section-heading">248 creating·a·three·tuple.</p></section><p><a·href=""·id="cross_cover"></a></p><h2·id="cross-cover-analysis"·class="section-heading">
249 ··<a·href="#cross-cover-analysis"·class="hover-link">249 ··<a·href="#cross-cover-analysis"·class="hover-link">
250 ····<i·class="ri-link-m"·aria-hidden="true"></i>250 ····<i·class="ri-link-m"·aria-hidden="true"></i>
251 ··</a>251 ··</a>
252 ··<span·class="text">Cross·Cover·Analysis</span>252 ··<span·class="text">Cross·Cover·Analysis</span>
253 </h2>253 </h2>
Offset 276, 15 lines modifiedOffset 276, 15 lines modified
276 ··{incl_mods,[m1]}.</code></pre><p>This·gives·an·entry·for·<code·class="inline">m1</code>·also·in·the·cover·log·for·test·run·<code·class="inline">s2</code>.·The276 ··{incl_mods,[m1]}.</code></pre><p>This·gives·an·entry·for·<code·class="inline">m1</code>·also·in·the·cover·log·for·test·run·<code·class="inline">s2</code>.·The
277 problem·is·that·this·only·reflects·the·coverage·by·<code·class="inline">s2</code>·tests,·not·the277 problem·is·that·this·only·reflects·the·coverage·by·<code·class="inline">s2</code>·tests,·not·the
278 accumulated·result·over·<code·class="inline">s1</code>·and·<code·class="inline">s2</code>.·This·is·where·the·cross·cover·mechanism278 accumulated·result·over·<code·class="inline">s1</code>·and·<code·class="inline">s2</code>.·This·is·where·the·cross·cover·mechanism
279 comes·in·handy.</p><p>If·instead·the·cover·specification·for·<code·class="inline">s2</code>·is·like·the·following:</p><pre><code·class="text">s2.cover:279 comes·in·handy.</p><p>If·instead·the·cover·specification·for·<code·class="inline">s2</code>·is·like·the·following:</p><pre><code·class="text">s2.cover:
280 ··{cross,[{s1,[m1]}]}.</code></pre><p>Then·<code·class="inline">m1</code>·is·cover·compiled·in·test·run·<code·class="inline">s2</code>,·but·not·shown·in·the·coverage·log.280 ··{cross,[{s1,[m1]}]}.</code></pre><p>Then·<code·class="inline">m1</code>·is·cover·compiled·in·test·run·<code·class="inline">s2</code>,·but·not·shown·in·the·coverage·log.
281 Instead,·if·<a·href="ct_cover.html#cross_cover_analyse/2"><code·class="inline">ct_cover:cross_cover_analyse/2</code></a>·is·called·after·both·<code·class="inline">s1</code>·and·<code·class="inline">s2</code>281 Instead,·if·<a·href="ct_cover.html#cross_cover_analyse/2"><code·class="inline">ct_cover:cross_cover_analyse/2</code></a>·is·called·after·both·<code·class="inline">s1</code>·and·<code·class="inline">s2</code>
282 test·runs·are·completed,·the·accumulated·result·for·<code·class="inline">m1</code>·is·available·in·the282 test·runs·are·completed,·the·accumulated·result·for·<code·class="inline">m1</code>·is·available·in·the
283 cross·cover·log·for·test·run·<code·class="inline">s1</code>.</p><p>The·call·to·the·analyze·function·must·be·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct_cover</span><span·class="p">:</span><span·class="nf">cross_cover_analyse</span><span·class="p"·data-group-id="9397212101-1">(</span><span·class="n">Level</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9397212101-2">[</span><span·class="p"·data-group-id="9397212101-3">{</span><span·class="ss">s1</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·385,·SHA:·b59e70cfcd87ce068f9a1037e3eaf81a9933d521106aea30e8ad92b86d15091c·...·]1-1">)</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">S1LogDir</code>·and·<code·class="inline">S2LogDir</code>·are·the·directories·named·<code·class="inline">&lt;TestName&gt;.logs</code>·for283 cross·cover·log·for·test·run·<code·class="inline">s1</code>.</p><p>The·call·to·the·analyze·function·must·be·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct_cover</span><span·class="p">:</span><span·class="nf">cross_cover_analyse</span><span·class="p"·data-group-id="9716144911-1">(</span><span·class="n">Level</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9716144911-2">[</span><span·class="p"·data-group-id="9716144911-3">{</span><span·class="ss">s1</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·385,·SHA:·2acfd3a62098960c5cbbbf23912a6a7e06772ec84e4516fd40d66d6421b41abf·...·]1-1">)</span><span·class="p">.</span></code></pre><p>Here,·<code·class="inline">S1LogDir</code>·and·<code·class="inline">S2LogDir</code>·are·the·directories·named·<code·class="inline">&lt;TestName&gt;.logs</code>·for
284 each·test·respectively.</p><p>Notice·the·tags·<code·class="inline">s1</code>·and·<code·class="inline">s2</code>,·which·are·used·in·the·cover·specification·file284 each·test·respectively.</p><p>Notice·the·tags·<code·class="inline">s1</code>·and·<code·class="inline">s2</code>,·which·are·used·in·the·cover·specification·file
285 and·in·the·call·to·<a·href="ct_cover.html#cross_cover_analyse/2"><code·class="inline">ct_cover:cross_cover_analyse/2</code></a>.·The·purpose·of·these·is285 and·in·the·call·to·<a·href="ct_cover.html#cross_cover_analyse/2"><code·class="inline">ct_cover:cross_cover_analyse/2</code></a>.·The·purpose·of·these·is
286 only·to·map·the·modules·specified·in·the·cover·specification·to·the·log286 only·to·map·the·modules·specified·in·the·cover·specification·to·the·log
287 directory·specified·in·the·call·to·the·analyze·function.·The·tag·name·has·no287 directory·specified·in·the·call·to·the·analyze·function.·The·tag·name·has·no
288 meaning·beyond·this.</p><h2·id="logging"·class="section-heading">288 meaning·beyond·this.</p><h2·id="logging"·class="section-heading">
289 ··<a·href="#logging"·class="hover-link">289 ··<a·href="#logging"·class="hover-link">
290 ····<i·class="ri-link-m"·aria-hidden="true"></i>290 ····<i·class="ri-link-m"·aria-hidden="true"></i>
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349 ······<p·class="built-using">349 ······<p·class="built-using">
350 ········Built·using350 ········Built·using
351 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the351 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
352 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>352 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
353 ······</p>353 ······</p>
354 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>354 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
355 ····</footer>355 ····</footer>
356 ··</div>356 ··</div>
357 </main>357 </main>
358 </div>358 </div>
359 <script>359 <script>
360 ··function·mermaidLoaded()·{360 ··function·mermaidLoaded()·{
361 ····mermaid.initialize({361 ····mermaid.initialize({
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1916 ························Opt·::·element·|·all,1916 ························Opt·::·element·|·all,
1917 ························ValueOrElement·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()·|·Default.</pre>1917 ························ValueOrElement·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()·|·Default.</pre>
  
1918 ······</div>1918 ······</div>
  
1919 <p>Reads·configuration·data·values.</p><p>Returns·the·matching·values·or·configuration·elements,·given·a·configuration1919 <p>Reads·configuration·data·values.</p><p>Returns·the·matching·values·or·configuration·elements,·given·a·configuration
1920 variable·key·or·its·associated·name·(if·one·has·been·specified·with1920 variable·key·or·its·associated·name·(if·one·has·been·specified·with
1921 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>·or·a·<code·class="inline">require</code>·statement).</p><p><em>Example:</em></p><p>Given·the·following·configuration·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9295713890-1">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="p"·data-group-id="9295713890-2">[</span><span·class="p"·data-group-id="9295713890-3">{</span><span·class="ss">telnet</span><span·class="p">,</span><span·class="n">IpAddr</span><span·class="p"·data-group-id="9295713890-3">}</span><span·class="p">,</span><span·class="w"> 
1922 ·······</span><span·class="p"·data-group-id="9295713890-4">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="p"·data-group-id="9295713890-5">[</span><span·class="p"·data-group-id="9295713890-6">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="n">Username</span><span·class="p"·data-group-id="9295713890-6">}</span><span·class="p">,</span><span·class="w"> 
1923 ··············</span><span·class="p"·data-group-id="9295713890-7">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="9295713890-7">}</span><span·class="p"·data-group-id="9295713890-[·...·truncated·by·diffoscope;·len:·845,·SHA:·d142f1ba366ed5e8d4791928ac5d306ba5542de11b61980c526a2947b1924b2e·...·]-3">}</span><span·class="p">,</span><span·class="w">1921 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>·or·a·<code·class="inline">require</code>·statement).</p><p><em>Example:</em></p><p>Given·the·following·configuration·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·[·...·truncated·by·diffoscope;·len:·319,·SHA:·8b6f900fc988538df0e3eb1e0214e27742c5a66959eccfbefe48035f5459a8ac·...·]-3">}</span><span·class="p">,</span><span·class="w">
 1922 ·······</span><span·class="p"·data-group-id="7668511079-4">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="p"·data-group-id="7668511079-5">[</span><span·class="p"·data-group-id="7668511079-6">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="n">Username</span><span·class="p"·data-group-id="7668511079-6">}</span><span·class="p">,</span><span·class="w">
 1923 ··············</span><span·class="p"·data-group-id="7668511079-7">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="7668511079-7">}</span><span·class="p"·data-group-id="7668511079-5">]</span><span·class="p"·data-group-id="7668511079-4">}</span><span·class="p"·data-group-id="7668511079-2">]</span><span·class="p"·data-group-id="7668511079-1">}</span><span·class="p">.</span></code></pre><p>Then:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="5711543459-1">(</span><span·class="ss">unix</span><span·class="p">,</span><span·class="n">Default</span><span·class="p"·data-group-id="5711543459-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5711543459-2">[</span><span·class="p"·data-group-id="5711543459-3">{</span><span·class="ss">telnet</span><span·class="p">,</span><span·class="n">IpAddr</span><span·class="p"·data-group-id="5711543459-3">}</span><span·class="p">,</span><span·class="w">
1924 ·</span><span·class="p"·data-group-id="9058880464-4">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9058880464-5">[</span><span·class="p"·data-group-id="9058880464-6">{</span><span·class="ss">username</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·476,·SHA:·e96827bcbf12eb3558217c30d95d15211b62ed8616e6932b5ef0a4002ee121ff·...·]-2">]</span><span·class="w">1924 ·</span><span·class="p"·data-group-id="5711543459-4">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5711543459-5">[</span><span·class="p"·data-group-id="5711543459-6">{</span><span·class="ss">username</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·476,·SHA:·33289a8ca1670984366878620c1f52856c694a7873894d3783a40381767b201a·...·]-2">]</span><span·class="w">
1925 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="9058880464-8">(</span><span·class="p"·data-group-id="9058880464-9">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">telnet</span><span·class="p"·data-group-id="9058880464-9">}</span><span·class="p">,</span><span·class="n">Defaul[·...·truncated·by·diffoscope;·len:·49,·SHA:·ebb472a12acd07055c39d4544de934e0227576febfee4d6feaae46fcc51e185b·...·]-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">IpAddr</span><span·class="w">1925 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="5711543459-8">(</span><span·class="p"·data-group-id="5711543459-9">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">telnet</span><span·class="p"·data-group-id="5711543459-9">}</span><span·class="p">,</span><span·class="n">Defaul[·...·truncated·by·diffoscope;·len:·49,·SHA:·a2da77da5b1bb8ac7d29dfa32044b7df6d912b169b31a6d3d451f71be5155ae9·...·]-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">IpAddr</span><span·class="w">
1926 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="9058880464-10">(</span><span·class="p"·data-group-id="9058880464-11">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">user</span><span·class="p">,</span><span·class="ss">username</span><span·class="p"·data-group-id="9058880464-1[·...·truncated·by·diffoscope;·len:·106,·SHA:·73da6dd26611bb516a944f16fba350e704c8057557a9908b1964f1bf40fb85ad·...·]-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Username</span><span·class="w">1926 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="5711543459-10">(</span><span·class="p"·data-group-id="5711543459-11">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">user</span><span·class="p">,</span><span·class="ss">username</span><span·class="p"·data-group-id="5711543459-1[·...·truncated·by·diffoscope;·len:·106,·SHA:·4199f99c7c0ee294e530b3d1c0fa3857140ae0fe717b2eab26bfda50d0abcf2b·...·]-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Username</span><span·class="w">
1927 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="9058880464-12">(</span><span·class="p"·data-group-id="9058880464-13">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">ftp</span><span·class="p"·data-group-id="9058880464-13">}</span><span·class="p">,</span><span·class="n">Defaul[·...·truncated·by·diffoscope;·len:·49,·SHA:·ebb472a12acd07055c39d4544de934e0227576febfee4d6feaae46fcc51e185b·...·]-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Default</span><span·class="w">1927 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="5711543459-12">(</span><span·class="p"·data-group-id="5711543459-13">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">ftp</span><span·class="p"·data-group-id="5711543459-13">}</span><span·class="p">,</span><span·class="n">Defaul[·...·truncated·by·diffoscope;·len:·49,·SHA:·a2da77da5b1bb8ac7d29dfa32044b7df6d912b169b31a6d3d451f71be5155ae9·...·]-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Default</span><span·class="w">
1928 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="9058880464-14">(</span><span·class="ss">unknownkey</span><span·class="p">,</span><span·class="n">Default</span><span·class="p"·data-group-id="9058880464-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Default</span></code></pre><p>If·a·configuration·variable·key·has·been·associated·with·a·name·(by1928 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="5711543459-14">(</span><span·class="ss">unknownkey</span><span·class="p">,</span><span·class="n">Default</span><span·class="p"·data-group-id="5711543459-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Default</span></code></pre><p>If·a·configuration·variable·key·has·been·associated·with·a·name·(by
1929 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>·or·a·<code·class="inline">require</code>·statement),·the·name·can·be·used1929 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>·or·a·<code·class="inline">require</code>·statement),·the·name·can·be·used
1930 instead·of·the·key·to·read·the·value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="1217705138-1">(</span><span·class="ss">myuser</span><span·class="p">,</span><span·class="p"·data-group-id="1217705138-2">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">user</span><span·class="p"·data-group-id="1217705138-2">}<[·...·truncated·by·diffoscope;·len:·46,·SHA:·10dedb154af4289f24a8c95f7098d4da61903e7fb0571a2afd8a949207c788f8·...·]8-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">1930 instead·of·the·key·to·read·the·value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="5860270128-1">(</span><span·class="ss">myuser</span><span·class="p">,</span><span·class="p"·data-group-id="5860270128-2">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="ss">user</span><span·class="p"·data-group-id="5860270128-2">}<[·...·truncated·by·diffoscope;·len:·46,·SHA:·a58ca22497b029190de0d82877b890c01299e23cec7d9eedf7126375f9dd6083·...·]8-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
1931 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="1217705138-3">(</span><span·class="ss">myuser</span><span·class="p">,</span><span·class="n">Default</span><span·class="p"·data-group-id="1217705138-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·506,·SHA:·5b98854a1070f3b3259be339cbc52617843fde79e9381e5d50c7f0426c7a2706·...·]8-4">]</span></code></pre><p>If·a·configuration·variable·is·defined·in·multiple·files,·use·option·<code·class="inline">all</code>·to1931 </span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="5860270128-3">(</span><span·class="ss">myuser</span><span·class="p">,</span><span·class="n">Default</span><span·class="p"·data-group-id="5860270128-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·506,·SHA:·fcfabe58358d2fc2c3629e69fb1ae852c0a30b42b30b0d0faa6ec926749879fd·...·]8-4">]</span></code></pre><p>If·a·configuration·variable·is·defined·in·multiple·files,·use·option·<code·class="inline">all</code>·to
1932 access·all·possible·values.·The·values·are·returned·in·a·list.·The·order·of·the1932 access·all·possible·values.·The·values·are·returned·in·a·list.·The·order·of·the
1933 elements·corresponds·to·the·order·that·the·configuration·files·were·specified·at1933 elements·corresponds·to·the·order·that·the·configuration·files·were·specified·at
1934 startup.</p><p>If·configuration·elements·(key-value·tuples)·are·to·be·returned·as·result1934 startup.</p><p>If·configuration·elements·(key-value·tuples)·are·to·be·returned·as·result
1935 instead·of·values,·use·option·<code·class="inline">element</code>.·The·returned·elements·are·then·on·the1935 instead·of·values,·use·option·<code·class="inline">element</code>.·The·returned·elements·are·then·on·the
1936 form·<code·class="inline">{Required,Value}</code>.</p><p>See·also·<a·href="#get_config/1"><code·class="inline">ct:get_config/1</code></a>,1936 form·<code·class="inline">{Required,Value}</code>.</p><p>See·also·<a·href="#get_config/1"><code·class="inline">ct:get_config/1</code></a>,
1937 <a·href="#get_config/2"><code·class="inline">ct:get_config/2</code></a>,·<a·href="#require/1"><code·class="inline">ct:require/1</code></a>,1937 <a·href="#get_config/2"><code·class="inline">ct:get_config/2</code></a>,·<a·href="#require/1"><code·class="inline">ct:require/1</code></a>,
1938 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>.</p>1938 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>.</p>
Offset 1962, 15 lines modifiedOffset 1962, 15 lines modified
1962 ······<div·class="specs">1962 ······<div·class="specs">
  
1963 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_event_mgr_ref()·->·EvMgrRef·when·EvMgrRef·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>().</pre>1963 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_event_mgr_ref()·->·EvMgrRef·when·EvMgrRef·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>().</pre>
  
1964 ······</div>1964 ······</div>
  
1965 <p>Gets·a·reference·to·the·<code·class="inline">Common·Test</code>·event·manager.·The·reference·can·be·used1965 <p>Gets·a·reference·to·the·<code·class="inline">Common·Test</code>·event·manager.·The·reference·can·be·used
1966 to,·for·example,·add·a·user-specific·event·handler·while·tests·are·running.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="9186744525-1">(</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_event_mgr_ref</span><span·class="p"·data-group-id="9186744525-2">(</span><span·class="p"·data-group-id="9186744525-2">)</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·237,·SHA:·059773950bed3d02869a76cd3b155c7f0f4a744639606b37b4ccaf6cce596986·...·]-1">)</span></code></pre>1966 to,·for·example,·add·a·user-specific·event·handler·while·tests·are·running.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="5915568954-1">(</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_event_mgr_ref</span><span·class="p"·data-group-id="5915568954-2">(</span><span·class="p"·data-group-id="5915568954-2">)</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·237,·SHA:·bc3a5ad2c592ed71499dbc8356f3d70be2ed25fa6f6c34dad8e361e664eacf5c·...·]-1">)</span></code></pre>
1967 ··</section>1967 ··</section>
1968 </section>1968 </section>
1969 <section·class="detail"·id="get_progname/0">1969 <section·class="detail"·id="get_progname/0">
  
1970 ··<div·class="detail-header">1970 ··<div·class="detail-header">
1971 ····<a·href="#get_progname/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1971 ····<a·href="#get_progname/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1972 ······<i·class="ri-link-m"·aria-hidden="true"></i>1972 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 2235, 15 lines modifiedOffset 2235, 15 lines modified
2235 ·····················KeyOrFile·::·{key,·Key}·|·{file,·KeyFile},2235 ·····················KeyOrFile·::·{key,·Key}·|·{file,·KeyFile},
2236 ·····················Key·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),2236 ·····················Key·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
2237 ·····················KeyFile·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),2237 ·····················KeyFile·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
2238 ·····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>2238 ·····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
2239 ······</div>2239 ······</div>
  
2240 <p>Installs·configuration·files·and·event·handlers.</p><p>Run·this·function·once·before·the·first·test.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">install</span><span·class="p"·data-group-id="9410044512-1">(</span><span·class="p"·data-group-id="9410044512-2">[</span><span·class="p"·data-group-id="9410044512-3">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="p"·data-group-id="9410044512-4">[</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·303,·SHA:·fb77a69813c3ee131f44e586248ea36ae427c61de838344bf8d0af9b3e8e0cba·...·]-1">)</span></code></pre><p>This·function·is·automatically·run·by·program·<code·class="inline">ct_run</code>.</p>2240 <p>Installs·configuration·files·and·event·handlers.</p><p>Run·this·function·once·before·the·first·test.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">install</span><span·class="p"·data-group-id="6275631123-1">(</span><span·class="p"·data-group-id="6275631123-2">[</span><span·class="p"·data-group-id="6275631123-3">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="p"·data-group-id="6275631123-4">[</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·303,·SHA:·5cf1783bc25cd1b2f5c592d4f527c759fb7c1aa206810ed99728f17ad8e483d8·...·]-1">)</span></code></pre><p>This·function·is·automatically·run·by·program·<code·class="inline">ct_run</code>.</p>
2241 ··</section>2241 ··</section>
2242 </section>2242 </section>
2243 <section·class="detail"·id="listenv/1">2243 <section·class="detail"·id="listenv/1">
  
2244 ··<div·class="detail-header">2244 ··<div·class="detail-header">
2245 ····<a·href="#listenv/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2245 ····<a·href="#listenv/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
2246 ······<i·class="ri-link-m"·aria-hidden="true"></i>2246 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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3026 ·····················SubKey·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),3026 ·····················SubKey·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),
3027 ·····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>3027 ·····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
3028 ······</div>3028 ······</div>
  
3029 <p>Checks·if·the·required·configuration·is·available.·Arbitrarily·deep·tuples·can3029 <p>Checks·if·the·required·configuration·is·available.·Arbitrarily·deep·tuples·can
3030 be·specified·as·<code·class="inline">Required</code>.·Only·the·last·element·of·the·tuple·can·be·a·list·of3030 be·specified·as·<code·class="inline">Required</code>.·Only·the·last·element·of·the·tuple·can·be·a·list·of
3031 <code·class="inline">SubKey</code>s.</p><p><em>Example·1.</em>·Require·the·variable·<code·class="inline">myvar</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="7750737522-1">(</span><span·class="ss">myvar</span><span·class="p"·data-group-id="7750737522-1">)</span><span·class="p">.</span></code></pre><p>In·this·case·the·configuration·file·must·at·least·contain:</p><pre><code·class="makeup·erlang"·translate="no"><s[·...·truncated·by·diffoscope;·len:·3488,·SHA:·a85f87959820980885a7c87c59cd34216acbe20323bcf1388e3438a80c1ac854·...·]-1">}</span><span·class="p">.</span></code></pre><p>See·also·<a·href="#get_config/1"><code·class="inline">ct:get_config/1</code></a>,3031 <code·class="inline">SubKey</code>s.</p><p><em>Example·1.</em>·Require·the·variable·<code·class="inline">myvar</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="1151252668-1">(</span><span·class="ss">myvar</span><span·class="p"·data-group-id="1151252668-1">)</span><span·class="p">.</span></code></pre><p>In·this·case·the·configuration·file·must·at·least·contain:</p><pre><code·class="makeup·erlang"·translate="no"><s[·...·truncated·by·diffoscope;·len:·3488,·SHA:·93af4a51cbd458b4db2b7d608e3fe36aff577e8a7068aba9194c47886ce5960d·...·]-1">}</span><span·class="p">.</span></code></pre><p>See·also·<a·href="#get_config/1"><code·class="inline">ct:get_config/1</code></a>,
3032 <a·href="#get_config/2"><code·class="inline">ct:get_config/2</code></a>,·<a·href="#get_config/3"><code·class="inline">ct:get_config/3</code></a>,3032 <a·href="#get_config/2"><code·class="inline">ct:get_config/2</code></a>,·<a·href="#get_config/3"><code·class="inline">ct:get_config/3</code></a>,
3033 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>.</p>3033 <a·href="#require/2"><code·class="inline">ct:require/2</code></a>.</p>
3034 ··</section>3034 ··</section>
3035 </section>3035 </section>
3036 <section·class="detail"·id="require/2">3036 <section·class="detail"·id="require/2">
  
3037 ··<div·class="detail-header">3037 ··<div·class="detail-header">
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3066 <p>Checks·if·the·required·configuration·is·available·and·gives·it·a·name.·The3066 <p>Checks·if·the·required·configuration·is·available·and·gives·it·a·name.·The
3067 semantics·for·<code·class="inline">Required</code>·is·the·same·as·in·<a·href="#require/1"><code·class="inline">ct:require/1</code></a>·except3067 semantics·for·<code·class="inline">Required</code>·is·the·same·as·in·<a·href="#require/1"><code·class="inline">ct:require/1</code></a>·except
3068 that·a·list·of·<code·class="inline">SubKey</code>s·cannot·be·specified.</p><p>If·the·requested·data·is·available,·the·subentry·is·associated·with·<code·class="inline">Name</code>·so3068 that·a·list·of·<code·class="inline">SubKey</code>s·cannot·be·specified.</p><p>If·the·requested·data·is·available,·the·subentry·is·associated·with·<code·class="inline">Name</code>·so
3069 that·the·value·of·the·element·can·be·read·with3069 that·the·value·of·the·element·can·be·read·with
3070 <a·href="#get_config/1"><code·class="inline">ct:get_config/1,2</code></a>·provided·<code·class="inline">Name</code>·is·used·instead·of·the3070 <a·href="#get_config/1"><code·class="inline">ct:get_config/1,2</code></a>·provided·<code·class="inline">Name</code>·is·used·instead·of·the
3071 whole·<code·class="inline">Required</code>·term.</p><p><em>Example:</em></p><p>Require·one·node·with·a·Telnet·connection·and·an·FTP·connection.·Name·the·node3071 whole·<code·class="inline">Required</code>·term.</p><p><em>Example:</em></p><p>Require·one·node·with·a·Telnet·connection·and·an·FTP·connection.·Name·the·node
3072 <code·class="inline">a</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="1299915321-1">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="p"·data-group-id="1299915321-2">{</span><span·class="ss">machine</span><span·class="p">,</span><span·class="nb">node</span><span·class="p"·data-group-id="1299915321-2">}</span><span·class="p"·data-group-id="1299915321-1">)</span><span·class="p">.</span></code></pre><p>All·references·to·this·node·can·then·use·the·node·name.·For·example,·a·file·over 
3073 FTP·is·fetched·like·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">ftp_get</sp[·...·truncated·by·diffoscope;·len:·1560,·SHA:·863b35a4816ac8c5dac32f819131672b907e9631ce2a1b847d3461009cb70f03·...·]3072 <code·class="inline">a</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</[·...·truncated·by·diffoscope;·len:·469,·SHA:·4960798e48f70f0f5a71e00c285c954d1f90d4fe611230007b808fa43eda3bfb·...·]
 3073 FTP·is·fetched·like·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">ftp_get</span><span·class="p"·data-group-id="2154271070-1">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="n">RemoteFile</span><span·class="p">,</span><span·class="n">LocalFile</span><span·class="p"·data-group-id="2154271070-1">)</span><span·class="p">.</span></code></pre><p>For·this·to·work,·the·configuration·file·must·at·least·contain:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5292490427-1">{</span><span·class="ss">machine</span><span·class="p">,</span><span·class="p"·data-group-id="5292490427-2">[</span><span·class="p"·data-group-id="5292490427-3">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="5292490427-4">[</span><span·class="p"·data-group-id="5292490427-5">{</span><span·class="ss">telnet</span><span·class="p">,</span><span·class="n">IpAddr</span><span·class="p"·data-group-id="5292490427-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="5292490427-6">{</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="n">IpAddr</span><span·class="p"·data-group-id="5292490427-6">}</span><span·class="p"·data-group-id="5292490427-4">]</span><span·class="p"·data-group-id="5292490427-3">}</span><span·class="p"·data-group-id="5292490427-2">]</span><span·class="p"·data-group-id="5292490427-1">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·behavior·of·this·function·changed·radically·in·<code·class="inline">Common·Test</code>·1.6.2.·To
3074 keep·some·backwards·compatibility,·it·is·still·possible·to·do:3074 keep·some·backwards·compatibility,·it·is·still·possible·to·do:
3075 <code·class="inline">ct:require(a,{node,[telnet,ftp]}).</code>·This·associates·the·name·<code·class="inline">a</code>·with·the3075 <code·class="inline">ct:require(a,{node,[telnet,ftp]}).</code>·This·associates·the·name·<code·class="inline">a</code>·with·the
3076 top-level·<code·class="inline">node</code>·entry.·For·this·to·work,·the·configuration·file·must·at·least3076 top-level·<code·class="inline">node</code>·entry.·For·this·to·work,·the·configuration·file·must·at·least
3077 contain:·<code·class="inline">{node,[{telnet,IpAddr},{ftp,IpAddr}]}.</code></p></section><p>See·also·<a·href="#get_config/1"><code·class="inline">ct:get_config/1</code></a>,3077 contain:·<code·class="inline">{node,[{telnet,IpAddr},{ftp,IpAddr}]}.</code></p></section><p>See·also·<a·href="#get_config/1"><code·class="inline">ct:get_config/1</code></a>,
3078 <a·href="#get_config/2"><code·class="inline">ct:get_config/2</code></a>,·<a·href="#get_config/3"><code·class="inline">ct:get_config/3</code></a>,3078 <a·href="#get_config/2"><code·class="inline">ct:get_config/2</code></a>,·<a·href="#get_config/3"><code·class="inline">ct:get_config/3</code></a>,
3079 <a·href="#require/1"><code·class="inline">ct:require/1</code></a>.</p>3079 <a·href="#require/1"><code·class="inline">ct:require/1</code></a>.</p>
3080 ··</section>3080 ··</section>
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3426 ······</div>3426 ······</div>
  
3427 <p>Starts·<code·class="inline">Common·Test</code>·in·interactive·mode.</p><p>From·this·mode,·all·test·case·support·functions·can·be·executed·directly·from3427 <p>Starts·<code·class="inline">Common·Test</code>·in·interactive·mode.</p><p>From·this·mode,·all·test·case·support·functions·can·be·executed·directly·from
3428 the·Erlang·shell.·The·interactive·mode·can·also·be·started·from·the·OS·command3428 the·Erlang·shell.·The·interactive·mode·can·also·be·started·from·the·OS·command
3429 line·with·<code·class="inline">ct_run·-shell·[-config·File...]</code>.</p><p>If·any·functions·(for·example,·Telnet·or·FTP)·using·&quot;required·configuration3429 line·with·<code·class="inline">ct_run·-shell·[-config·File...]</code>.</p><p>If·any·functions·(for·example,·Telnet·or·FTP)·using·&quot;required·configuration
3430 data&quot;·are·to·be·called·from·the·Erlang·shell,·configuration·data·must·first·be3430 data&quot;·are·to·be·called·from·the·Erlang·shell,·configuration·data·must·first·be
3431 required·with·<a·href="#require/2"><code·class="inline">ct:require/2</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="8159349436-1">(</span><span·class="ss">unix_telnet</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">unix</span><span·class="p"·data-group-id="8159349436-1">)</span><span·class="p">.</span><span·class="w">3431 required·with·<a·href="#require/2"><code·class="inline">ct:require/2</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">require</span><span·class="p"·data-group-id="4942000232-1">(</span><span·class="ss">unix_telnet</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">unix</span><span·class="p"·data-group-id="4942000232-1">)</span><span·class="p">.</span><span·class="w">
3432 </span><span·class="ss">ok</span><span·class="gp·unselectable">3432 </span><span·class="ss">ok</span><span·class="gp·unselectable">
3433 &gt;·</span><span·class="nc">ct_telnet</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="8159349436-2">(</span><span·class="ss">unix_telnet</span><span·class="p"·data-group-id="8159349436-2">)</span><span·class="p">.</span><span·class="w">3433 &gt;·</span><span·class="nc">ct_telnet</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="4942000232-2">(</span><span·class="ss">unix_telnet</span><span·class="p"·data-group-id="4942000232-2">)</span><span·class="p">.</span><span·class="w">
3434 </span><span·class="p"·data-group-id="8159349436-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.105</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="8159349436-3">}</span><span·class="gp·unselectable">3434 </span><span·class="p"·data-group-id="4942000232-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.105</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="4942000232-3">}</span><span·class="gp·unselectable">
3435 &gt;·</span><span·class="nc">ct_telnet</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="8159349436-4">(</span><span·class="ss">unix_telnet</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;ls·.&quot;</span><span·class="p"·data-group-id="8159349436-4">)</span><span·class="p">.</span><span·class="w">3435 &gt;·</span><span·class="nc">ct_telnet</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="4942000232-4">(</span><span·class="ss">unix_telnet</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;ls·.&quot;</span><span·class="p"·data-group-id="4942000232-4">)</span><span·class="p">.</span><span·class="w">
3436 </span><span·class="p"·data-group-id="8159349436-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8159349436-6">[</span><span·class="s">&quot;ls&quot;</span><span·class="p">,</span><span·class="s">&quot;file1··...&quot;</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·165,·SHA:·cbf9cfa2f0f00b906084c6b36e0a504f95ec4054a64096b09da8ee5b2ad43e61·...·]-5">}</span></code></pre>3436 </span><span·class="p"·data-group-id="4942000232-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4942000232-6">[</span><span·class="s">&quot;ls&quot;</span><span·class="p">,</span><span·class="s">&quot;file1··...&quot;</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·165,·SHA:·9d6bc4f21c940034b1b0253d95949ca154e0a12ed350815a1de640d0bb60423a·...·]-5">}</span></code></pre>
3437 ··</section>3437 ··</section>
3438 </section>3438 </section>
3439 <section·class="detail"·id="step/3">3439 <section·class="detail"·id="step/3">
  
3440 ··<div·class="detail-header">3440 ··<div·class="detail-header">
3441 ····<a·href="#step/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3441 ····<a·href="#step/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3442 ······<i·class="ri-link-m"·aria-hidden="true"></i>3442 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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3709 ······<p·class="built-using">3709 ······<p·class="built-using">
3710 ········Built·using3710 ········Built·using
3711 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3711 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3712 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3712 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3713 ······</p>3713 ······</p>
3714 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3714 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3715 ····</footer>3715 ····</footer>
3716 ··</div>3716 ··</div>
3717 </main>3717 </main>
3718 </div>3718 </div>
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308 ········Built·using308 ········Built·using
309 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the309 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
310 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>310 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
311 ······</p>311 ······</p>
312 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>312 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
313 ····</footer>313 ····</footer>
314 ··</div>314 ··</div>
315 </main>315 </main>
316 </div>316 </div>
317 <script>317 <script>
318 ··function·mermaidLoaded()·{318 ··function·mermaidLoaded()·{
319 ····mermaid.initialize({319 ····mermaid.initialize({
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567 ·················LocalFile·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename/0">file:filename</a>(),567 ·················LocalFile·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename/0">file:filename</a>(),
568 ·················RemoteFile·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename/0">file:filename</a>(),568 ·················RemoteFile·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename/0">file:filename</a>(),
569 ·················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>569 ·················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
570 ······</div>570 ······</div>
  
571 <p>Opens·an·FTP·connection·and·sends·a·file·to·the·remote·host.</p><p><code·class="inline">LocalFile</code>·and·<code·class="inline">RemoteFile</code>·must·be·absolute·paths.</p><p>If·the·target·host·is·a·&quot;special&quot;·node,·the·FTP·address·must·be·specified·in·the571 <p>Opens·an·FTP·connection·and·sends·a·file·to·the·remote·host.</p><p><code·class="inline">LocalFile</code>·and·<code·class="inline">RemoteFile</code>·must·be·absolute·paths.</p><p>If·the·target·host·is·a·&quot;special&quot;·node,·the·FTP·address·must·be·specified·in·the
572 configuration·file·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7537651911-1">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="7537651911-2">[</span><span·class="p"·data-group-id="7537651911-3">{</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="n">IpAddr</span><span·class="p"·data-group-id="7537651911-3">}</span><span·class="p"·data-group-id="7537651911-2">]</span><span·class="p"·data-group-id="7537651911-1">}</span><span·class="p">.</span></code></pre><p>If·the·target·host·is·something·else,·for·example,·a·UNIX·host,·the 
573 configuration·file·must·also·include·the·username·and·password·(both·strings):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8773182684-1">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="p"·data-group-id="877318268[·...·truncated·by·diffoscope;·len:·239,·SHA:·f0a7b677b9401de6e8ec500236195777e73c48873096e5366abf4776f3599aa7·...·]572 configuration·file·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6202172535-1">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="p"·data-group-id="6202172535-2">[</span><span·class="p"·data-group-id="6202[·...·truncated·by·diffoscope;·len:·364,·SHA:·8cf39beea0c978e50e3cf5769b5ad9e642a94f2b72f629cdb98170d3fe4653a2·...·]
 573 configuration·file·must·also·include·the·username·and·password·(both·strings):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5806776088-1">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="p"·data-group-id="5806776088-2">[</span><span·class="p"·data-group-id="5806776088-3">{</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="n">IpAddr</span><span·class="p"·data-group-id="5806776088-3">}</span><span·class="p">,</span><span·class="w">
574 ·······</span><span·class="p"·data-group-id="8773182684-4">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="n">Username</span><span·class="p"·data-group-id="8773182684-4">}</span><span·class="p">,</span><span·class="w">574 ·······</span><span·class="p"·data-group-id="5806776088-4">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="n">Username</span><span·class="p"·data-group-id="5806776088-4">}</span><span·class="p">,</span><span·class="w">
575 ·······</span><span·class="p"·data-group-id="8773182684-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="8773182684-5">}</span><span·class="p"·data-group-id="8773182684-2">]</span><span·class="p"·data-group-id="8773182684-1">}</span><span·class="p">.</span></code></pre><p>See·also·<a·href="ct.html#require/2"><code·class="inline">ct:require/2</code></a>.</p>575 ·······</span><span·class="p"·data-group-id="5806776088-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="5806776088-5">}</span><span·class="p"·data-group-id="5806776088-2">]</span><span·class="p"·data-group-id="5806776088-1">}</span><span·class="p">.</span></code></pre><p>See·also·<a·href="ct.html#require/2"><code·class="inline">ct:require/2</code></a>.</p>
576 ··</section>576 ··</section>
577 </section>577 </section>
578 <section·class="detail"·id="recv/2">578 <section·class="detail"·id="recv/2">
  
579 ··<div·class="detail-header">579 ··<div·class="detail-header">
580 ····<a·href="#recv/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">580 ····<a·href="#recv/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
581 ······<i·class="ri-link-m"·aria-hidden="true"></i>581 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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743 ········Built·using743 ········Built·using
744 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the744 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
745 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>745 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
746 ······</p>746 ······</p>
747 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>747 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
748 ····</footer>748 ····</footer>
749 ··</div>749 ··</div>
750 </main>750 </main>
751 </div>751 </div>
752 <script>752 <script>
753 ··function·mermaidLoaded()·{753 ··function·mermaidLoaded()·{
754 ····mermaid.initialize({754 ····mermaid.initialize({
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1362 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1362 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1363 ······</p>1363 ······</p>
1364 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1364 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1365 ····</footer>1365 ····</footer>
1366 ··</div>1366 ··</div>
1367 </main>1367 </main>
1368 </div>1368 </div>
1369 <script>1369 <script>
1370 ··function·mermaidLoaded()·{1370 ··function·mermaidLoaded()·{
1371 ····mermaid.initialize({1371 ····mermaid.initialize({
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249 </h3>249 </h3>
250 <p>In·a·CTH,·the·behavior·can·be·hooked·in·before·the·following·functions:</p><ul><li><a·href="ct_suite.html#c:init_per_suite/1"><code·class="inline">init_per_suite</code></a></li><li><a·href="ct_suite.html#c:init_per_group/2"><code·class="inline">init_per_group</code></a></li><li><a·href="ct_suite.html#c:init_per_testcase/2"><code·class="inline">init_per_testcase</code></a></li><li><a·href="ct_suite.html#c:end_per_testcase/2"><code·class="inline">end_per_testcase</code></a></li><li><a·href="ct_suite.html#c:end_per_group/2"><code·class="inline">end_per_group</code></a></li><li><a·href="ct_suite.html#c:end_per_suite/1"><code·class="inline">end_per_suite</code></a></li></ul><p>This·is·done·in·the·CTH·functions·called·<code·class="inline">pre_&lt;name·of·function&gt;</code>.·These250 <p>In·a·CTH,·the·behavior·can·be·hooked·in·before·the·following·functions:</p><ul><li><a·href="ct_suite.html#c:init_per_suite/1"><code·class="inline">init_per_suite</code></a></li><li><a·href="ct_suite.html#c:init_per_group/2"><code·class="inline">init_per_group</code></a></li><li><a·href="ct_suite.html#c:init_per_testcase/2"><code·class="inline">init_per_testcase</code></a></li><li><a·href="ct_suite.html#c:end_per_testcase/2"><code·class="inline">end_per_testcase</code></a></li><li><a·href="ct_suite.html#c:end_per_group/2"><code·class="inline">end_per_group</code></a></li><li><a·href="ct_suite.html#c:end_per_suite/1"><code·class="inline">end_per_suite</code></a></li></ul><p>This·is·done·in·the·CTH·functions·called·<code·class="inline">pre_&lt;name·of·function&gt;</code>.·These
251 functions·take·the·arguments·<code·class="inline">SuiteName</code>,·<code·class="inline">Name</code>·(group·or·test·case·name,·if251 functions·take·the·arguments·<code·class="inline">SuiteName</code>,·<code·class="inline">Name</code>·(group·or·test·case·name,·if
252 applicable),·<code·class="inline">Config</code>,·and·<code·class="inline">CTHState</code>.·The·return·value·of·the·CTH·function·is252 applicable),·<code·class="inline">Config</code>,·and·<code·class="inline">CTHState</code>.·The·return·value·of·the·CTH·function·is
253 always·a·combination·of·a·result·for·the·suite/group/test·and·an·updated253 always·a·combination·of·a·result·for·the·suite/group/test·and·an·updated
254 <code·class="inline">CTHState</code>.</p><p>To·let·the·test·suite·continue·on·executing,·return·the·configuration·list·that254 <code·class="inline">CTHState</code>.</p><p>To·let·the·test·suite·continue·on·executing,·return·the·configuration·list·that
255 you·want·the·test·to·use·as·the·result.</p><p>All·pre·hooks,·except·<code·class="inline">pre_end_per_testcase/4</code>,·can·skip·or·fail·the·test·by255 you·want·the·test·to·use·as·the·result.</p><p>All·pre·hooks,·except·<code·class="inline">pre_end_per_testcase/4</code>,·can·skip·or·fail·the·test·by
256 returning·a·tuple·with·<code·class="inline">skip</code>·or·<code·class="inline">fail</code>,·and·a·reason·as·the·result.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">pre_init_per_suite</span><span·class="p"·data-group-id="6400466790-1">(</span><span·class="n">SuiteName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CTHState</span><span·class="p"·data-group-id="6400466790-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">256 returning·a·tuple·with·<code·class="inline">skip</code>·or·<code·class="inline">fail</code>,·and·a·reason·as·the·result.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">pre_init_per_suite</span><span·class="p"·data-group-id="5421457930-1">(</span><span·class="n">SuiteName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CTHState</span><span·class="p"·data-group-id="5421457930-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
257 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="6400466790-2">(</span><span·class="p"·data-group-id="6400466790-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">257 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="5421457930-2">(</span><span·class="p"·data-group-id="5421457930-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
258 ····</span><span·class="p"·data-group-id="6400466790-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Reason</span><span·class="p"·data-group-id="6400466790-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">258 ····</span><span·class="p"·data-group-id="5421457930-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Reason</span><span·class="p"·data-group-id="5421457930-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
259 ······</span><span·class="p"·data-group-id="6400466790-4">{</span><span·class="p"·data-group-id="6400466790-5">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Could·not·connect·to·DB&quot;</span><span·class="p"·data-group-id="6400466790-5">}<[·...·truncated·by·diffoscope;·len:·125,·SHA:·169dfd86c61fa8d6e0ab6cb41096a3044aba7ef042666034a22009e9878916a0·...·]0-4">}</span><span·class="p">;</span><span·class="w">259 ······</span><span·class="p"·data-group-id="5421457930-4">{</span><span·class="p"·data-group-id="5421457930-5">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Could·not·connect·to·DB&quot;</span><span·class="p"·data-group-id="5421457930-5">}<[·...·truncated·by·diffoscope;·len:·125,·SHA:·45c8c1c2736ec9e3bfb54af3cc8607ee043c0471fad6dc3c75a8cf2c455c0bd8·...·]0-4">}</span><span·class="p">;</span><span·class="w">
260 ····</span><span·class="p"·data-group-id="6400466790-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handle</span><span·class="p"·data-group-id="6400466790-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">260 ····</span><span·class="p"·data-group-id="5421457930-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handle</span><span·class="p"·data-group-id="5421457930-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
261 ······</span><span·class="p"·data-group-id="6400466790-7">{</span><span·class="p"·data-group-id="6400466790-8">[</span><span·class="p"·data-group-id="6400466790-9">{</span><span·class="ss">db_handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handle</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·648,·SHA:·bb4fc60625e58697732b1af9b37690ad38961a1a6dabc52eff1caca6c82d3e03·...·]0-7">}</span><span·class="w">261 ······</span><span·class="p"·data-group-id="5421457930-7">{</span><span·class="p"·data-group-id="5421457930-8">[</span><span·class="p"·data-group-id="5421457930-9">{</span><span·class="ss">db_handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handle</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·648,·SHA:·940b6d663c1a7beece328b4bd3243c63358e138d4b79c7bd302ccab566797aec·...·]0-7">}</span><span·class="w">
262 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·you·use·multiple·CTHs,·the·first·part·of·the·return·tuple·is·used·as·input262 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·you·use·multiple·CTHs,·the·first·part·of·the·return·tuple·is·used·as·input
263 for·the·next·CTH.·So·in·the·previous·example·the·next·CTH·can·get263 for·the·next·CTH.·So·in·the·previous·example·the·next·CTH·can·get
264 <code·class="inline">{fail,Reason}</code>·as·the·second·parameter.·If·you·have·many·CTHs·interacting,·do264 <code·class="inline">{fail,Reason}</code>·as·the·second·parameter.·If·you·have·many·CTHs·interacting,·do
265 not·let·each·CTH·return·<code·class="inline">fail</code>·or·<code·class="inline">skip</code>.·Instead,·return·that·an·action·is·to265 not·let·each·CTH·return·<code·class="inline">fail</code>·or·<code·class="inline">skip</code>.·Instead,·return·that·an·action·is·to
266 be·taken·through·the·<code·class="inline">Config</code>·list·and·implement·a·CTH·that,·at·the·end,·takes266 be·taken·through·the·<code·class="inline">Config</code>·list·and·implement·a·CTH·that,·at·the·end,·takes
267 the·correct·action.</p></section><p><a·href=""·id="post"></a></p><h3·id="post-hooks"·class="section-heading">267 the·correct·action.</p></section><p><a·href=""·id="post"></a></p><h3·id="post-hooks"·class="section-heading">
268 ··<a·href="#post-hooks"·class="hover-link">268 ··<a·href="#post-hooks"·class="hover-link">
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276 same·<code·class="inline">Config</code>·as·the·testcase·is·called·with.·<code·class="inline">Return</code>·is·the·value·returned·by276 same·<code·class="inline">Config</code>·as·the·testcase·is·called·with.·<code·class="inline">Return</code>·is·the·value·returned·by
277 the·testcase.·If·the·testcase·fails·by·crashing,·<code·class="inline">Return</code>·is277 the·testcase.·If·the·testcase·fails·by·crashing,·<code·class="inline">Return</code>·is
278 <code·class="inline">{'EXIT',{{Error,Reason},Stacktrace}}</code>.</p><p>The·return·value·of·the·CTH·function·is·always·a·combination·of·a·result·for·the278 <code·class="inline">{'EXIT',{{Error,Reason},Stacktrace}}</code>.</p><p>The·return·value·of·the·CTH·function·is·always·a·combination·of·a·result·for·the
279 suite/group/test·and·an·updated·<code·class="inline">CTHState</code>.·If·you·do·not·want·the·callback·to279 suite/group/test·and·an·updated·<code·class="inline">CTHState</code>.·If·you·do·not·want·the·callback·to
280 affect·the·outcome·of·the·test,·return·the·<code·class="inline">Return</code>·data·as·it·is·given·to·the280 affect·the·outcome·of·the·test,·return·the·<code·class="inline">Return</code>·data·as·it·is·given·to·the
281 CTH.·You·can·also·modify·the·test·result.·By·returning·the·<code·class="inline">Config</code>·list·with281 CTH.·You·can·also·modify·the·test·result.·By·returning·the·<code·class="inline">Config</code>·list·with
282 element·<code·class="inline">tc_status</code>·removed,·you·can·recover·from·a·test·failure.·As·in·all·the282 element·<code·class="inline">tc_status</code>·removed,·you·can·recover·from·a·test·failure.·As·in·all·the
283 pre·hooks,·it·is·also·possible·to·fail/skip·the·test·case·in·the·post·hook.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">post_end_per_testcase</span><span·class="p"·data-group-id="6385623581-1">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·cl[·...·truncated·by·diffoscope;·len:·506,·SHA:·d3c17038eb62304f70c7c26f62332a056bfecc876b10dda7c1fc99d2b70e9c35·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">283 pre·hooks,·it·is·also·possible·to·fail/skip·the·test·case·in·the·post·hook.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">post_end_per_testcase</span><span·class="p"·data-group-id="1160242930-1">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·cl[·...·truncated·by·diffoscope;·len:·506,·SHA:·cb3739301bbeee99c973971c0b652b1c97077b51e25ba7fae1516b1d7be82c0a·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
284 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">check_consistency</span><span·class="p"·data-group-id="6385623581-4">(</span><span·class="p"·data-group-id="6385623581-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">284 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">check_consistency</span><span·class="p"·data-group-id="1160242930-4">(</span><span·class="p"·data-group-id="1160242930-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
285 ····</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">285 ····</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
286 ······</span><span·class="c1">%%·DB·is·good,·pass·the·test.</span><span·class="w">286 ······</span><span·class="c1">%%·DB·is·good,·pass·the·test.</span><span·class="w">
287 ······</span><span·class="p"·data-group-id="6385623581-5">{</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="6385623581-6">(</span><span·class="ss">tc_status</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·189,·SHA:·6e03214cecd21c9c714e4e8c00bb017ad471e00bcb478830fbe535d3fb8c685f·...·]-5">}</span><span·class="p">;</span><span·class="w">287 ······</span><span·class="p"·data-group-id="1160242930-5">{</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="1160242930-6">(</span><span·class="ss">tc_status</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·189,·SHA:·da61201c16249491d2acb54296c0c01d857fc2b270f4b953af7d20817aa0a38c·...·]-5">}</span><span·class="p">;</span><span·class="w">
288 ····</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">288 ····</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
289 ······</span><span·class="c1">%%·DB·is·not·good,·mark·as·skipped·instead·of·failing</span><span·class="w">289 ······</span><span·class="c1">%%·DB·is·not·good,·mark·as·skipped·instead·of·failing</span><span·class="w">
290 ······</span><span·class="p"·data-group-id="6385623581-7">{</span><span·class="p"·data-group-id="6385623581-8">{</span><span·class="ss">skip</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;DB·is·inconsistent!&quot;</span><span·class="p"·data-group-id="6385623581-8">}</spa[·...·truncated·by·diffoscope;·len:·122,·SHA:·b66efae7bb797203a8b25c6910141002db024be3ce8e9dc4a91a0e659ac9844e·...·]-7">}</span><span·class="w">290 ······</span><span·class="p"·data-group-id="1160242930-7">{</span><span·class="p"·data-group-id="1160242930-8">{</span><span·class="ss">skip</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;DB·is·inconsistent!&quot;</span><span·class="p"·data-group-id="1160242930-8">}</spa[·...·truncated·by·diffoscope;·len:·122,·SHA:·a41c7b4bfab6ce07e283cee1c9dc9f0bc2ea145445127d6d8b0d212c6bf31e9f·...·]-7">}</span><span·class="w">
291 ··</span><span·class="k">end</span><span·class="p">;</span><span·class="w">291 ··</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
292 </span><span·class="nf">post_end_per_testcase</span><span·class="p"·data-group-id="6385623581-9">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·cl[·...·truncated·by·diffoscope;·len:·189,·SHA:·e202f3667ca2eb46474d74237ff7bf0f734c556c2c474a8be2f442ec94acf305·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">292 </span><span·class="nf">post_end_per_testcase</span><span·class="p"·data-group-id="1160242930-9">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·cl[·...·truncated·by·diffoscope;·len:·189,·SHA:·0d96e79d6e036cb57827353f6707b368b7481760272f5a1c16fd4656dffb6995·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
293 ··</span><span·class="c1">%%·Do·nothing·if·tc·does·not·crash.</span><span·class="w">293 ··</span><span·class="c1">%%·Do·nothing·if·tc·does·not·crash.</span><span·class="w">
294 ··</span><span·class="p"·data-group-id="6385623581-10">{</span><span·class="n">Return</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CTHState</span><span·class="p"·data-group-id="6385623581-10">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Do·recover·from·a·testcase·failure·using·CTHs·only·a·last·resort.·If·used294 ··</span><span·class="p"·data-group-id="1160242930-10">{</span><span·class="n">Return</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CTHState</span><span·class="p"·data-group-id="1160242930-10">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Do·recover·from·a·testcase·failure·using·CTHs·only·a·last·resort.·If·used
295 wrongly,·it·can·be·very·difficult·to·determine·which·tests·that·pass·or·fail295 wrongly,·it·can·be·very·difficult·to·determine·which·tests·that·pass·or·fail
296 in·a·test·run.</p></section><h3·id="skip-and-fail-hooks"·class="section-heading">296 in·a·test·run.</p></section><h3·id="skip-and-fail-hooks"·class="section-heading">
297 ··<a·href="#skip-and-fail-hooks"·class="hover-link">297 ··<a·href="#skip-and-fail-hooks"·class="hover-link">
298 ····<i·class="ri-link-m"·aria-hidden="true"></i>298 ····<i·class="ri-link-m"·aria-hidden="true"></i>
299 ··</a>299 ··</a>
300 ··<span·class="text">Skip·and·Fail·Hooks</span>300 ··<span·class="text">Skip·and·Fail·Hooks</span>
301 </h3>301 </h3>
Offset 336, 88 lines modifiedOffset 336, 88 lines modified
336 <p>The·following·CTH·logs·information·about·a·test·run·into·a·format·parseable·by336 <p>The·following·CTH·logs·information·about·a·test·run·into·a·format·parseable·by
337 <a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#consult/1"><code·class="inline">file:consult/1</code></a>·(in·Kernel):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%·Common·Test·Example·Common·Test·Hook·module.</span><span·class="w">337 <a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#consult/1"><code·class="inline">file:consult/1</code></a>·(in·Kernel):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%%·Common·Test·Example·Common·Test·Hook·module.</span><span·class="w">
338 </span><span·class="c1">%%%</span><span·class="w">338 </span><span·class="c1">%%%</span><span·class="w">
339 </span><span·class="c1">%%%·To·use·this·hook,·on·the·command·line:</span><span·class="w">339 </span><span·class="c1">%%%·To·use·this·hook,·on·the·command·line:</span><span·class="w">
340 </span><span·class="c1">%%%·····ct_run·-suite·example_SUITE·-pa·.·-ct_hooks·example_cth</span><span·class="w">340 </span><span·class="c1">%%%·····ct_run·-suite·example_SUITE·-pa·.·-ct_hooks·example_cth</span><span·class="w">
341 </span><span·class="c1">%%%</span><span·class="w">341 </span><span·class="c1">%%%</span><span·class="w">
342 </span><span·class="c1">%%%·Note·`-pa·.`:·the·hook·beam·file·must·be·in·the·code·path·when·installing.</span><span·class="w">342 </span><span·class="c1">%%%·Note·`-pa·.`:·the·hook·beam·file·must·be·in·the·code·path·when·installing.</span><span·class="w">
343 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3325276113-1">(</span><span·class="ss">example_cth</span><span·class="p"·data-group-id="3325276113-1">)</span><span·class="p">.</span><span·class="w">343 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1309239626-1">(</span><span·class="ss">example_cth</span><span·class="p"·data-group-id="1309239626-1">)</span><span·class="p">.</span><span·class="w">
  
344 </span><span·class="c1">%%·Mandatory·Callbacks</span><span·class="w">344 </span><span·class="c1">%%·Mandatory·Callbacks</span><span·class="w">
345 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-2">(</span><span·class="p"·data-group-id="3325276113-3">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="3325276113-3">]</span><span·class="p"·data-group-id="3325276113-2">)</span><span·class="p">.</span><span·class="w">345 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-2">(</span><span·class="p"·data-group-id="1309239626-3">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="1309239626-3">]</span><span·class="p"·data-group-id="1309239626-2">)</span><span·class="p">.</span><span·class="w">
  
346 </span><span·class="c1">%%·Optional·Callbacks</span><span·class="w">346 </span><span·class="c1">%%·Optional·Callbacks</span><span·class="w">
347 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-4">(</span><span·class="p"·data-group-id="3325276113-5">[</span><span·class="ss">id</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3325276113-5">]</span><span·class="p"·data-group-id="3325276113-4">)</span><span·class="p">.</span><span·class="w">347 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-4">(</span><span·class="p"·data-group-id="1309239626-5">[</span><span·class="ss">id</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="1309239626-5">]</span><span·class="p"·data-group-id="1309239626-4">)</span><span·class="p">.</span><span·class="w">
348 </span><span·class="w">348 </span><span·class="w">
349 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-6">(</span><span·class="p"·data-group-id="3325276113-7">[</span><span·class="ss">pre_init_per_suite</span><span·class="p">/</span><span·class="mi">3</span><span·class="p"·data-group-id="3325276113-7">]</span><span·class="p"·data-group-id="332527[·...·truncated·by·diffoscope;·len:·4,·SHA:·105b1d1853beed43cae5dfcea80d162fae4596e09da9b8679e58f34cee13ca46·...·]-6">)</span><span·class="p">.</span><span·class="w">349 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-6">(</span><span·class="p"·data-group-id="1309239626-7">[</span><span·class="ss">pre_init_per_suite</span><span·class="p">/</span><span·class="mi">3</span><span·class="p"·data-group-id="1309239626-7">]</span><span·class="p"·data-group-id="130923[·...·truncated·by·diffoscope;·len:·4,·SHA:·6399e0405c8d608f7d927e2f48ec8df76b51710ec65dadade31e73e03d604704·...·]-6">)</span><span·class="p">.</span><span·class="w">
350 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-8">(</span><span·class="p"·data-group-id="3325276113-9">[</span><span·class="ss">post_end_per_suite</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="3325276113-9">]</span><span·class="p"·data-group-id="332527[·...·truncated·by·diffoscope;·len:·4,·SHA:·105b1d1853beed43cae5dfcea80d162fae4596e09da9b8679e58f34cee13ca46·...·]-8">)</span><span·class="p">.</span><span·class="w">350 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-8">(</span><span·class="p"·data-group-id="1309239626-9">[</span><span·class="ss">post_end_per_suite</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="1309239626-9">]</span><span·class="p"·data-group-id="130923[·...·truncated·by·diffoscope;·len:·4,·SHA:·6399e0405c8d608f7d927e2f48ec8df76b51710ec65dadade31e73e03d604704·...·]-8">)</span><span·class="p">.</span><span·class="w">
351 </span><span·class="w">351 </span><span·class="w">
352 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-10">(</span><span·class="p"·data-group-id="3325276113-11">[</span><span·class="ss">pre_init_per_testcase</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="3325276113-11">]</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·73265689c414bdf921a9361c576c87273bf71dcf09b7aa9edcae5e091e4fc915·...·]-10">)</span><span·class="p">.</span><span·class="w">352 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-10">(</span><span·class="p"·data-group-id="1309239626-11">[</span><span·class="ss">pre_init_per_testcase</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="1309239626-11">]</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·c268f0612df523c055d636335eb907b7f5d8dd6034423b2b0f236549ba4b8179·...·]-10">)</span><span·class="p">.</span><span·class="w">
353 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-12">(</span><span·class="p"·data-group-id="3325276113-13">[</span><span·class="ss">post_end_per_testcase</span><span·class="p">/</span><span·class="mi">5</span><span·class="p"·data-group-id="3325276113-13">]</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·73265689c414bdf921a9361c576c87273bf71dcf09b7aa9edcae5e091e4fc915·...·]-12">)</span><span·class="p">.</span><span·class="w">353 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-12">(</span><span·class="p"·data-group-id="1309239626-13">[</span><span·class="ss">post_end_per_testcase</span><span·class="p">/</span><span·class="mi">5</span><span·class="p"·data-group-id="1309239626-13">]</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·c268f0612df523c055d636335eb907b7f5d8dd6034423b2b0f236549ba4b8179·...·]-12">)</span><span·class="p">.</span><span·class="w">
354 </span><span·class="w">354 </span><span·class="w">
355 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-14">(</span><span·class="p"·data-group-id="3325276113-15">[</span><span·class="ss">on_tc_skip</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="3325276113-15">]</span><span·class="p"·data-group-id="3325276113-14">)</span><span·class="p">.</span><span·class="w">355 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-14">(</span><span·class="p"·data-group-id="1309239626-15">[</span><span·class="ss">on_tc_skip</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="1309239626-15">]</span><span·class="p"·data-group-id="1309239626-14">)</span><span·class="p">.</span><span·class="w">
356 </span><span·class="w">356 </span><span·class="w">
357 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3325276113-16">(</span><span·class="p"·data-group-id="3325276113-17">[</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3325276113-17">]</span><span·class="p"·data-group-id="3325276113-16">)</span><span·class="p">.</span><span·class="w">357 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1309239626-16">(</span><span·class="p"·data-group-id="1309239626-17">[</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="1309239626-17">]</span><span·class="p"·data-group-id="1309239626-16">)</span><span·class="p">.</span><span·class="w">
  
358 </span><span·class="c1">%%·This·hook·state·is·threaded·through·all·the·callbacks.</span><span·class="w">358 </span><span·class="c1">%%·This·hook·state·is·threaded·through·all·the·callbacks.</span><span·class="w">
359 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="3325276113-18">(</span><span·class="ss">state</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3325276113-19">{</span><span·class="ss">filename</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">total[·...·truncated·by·diffoscope;·len:·489,·SHA:·5eb2778d14551c9dc512ae172a1d43e9f673f48c0686cf106fd759cf1c8315f1·...·]-18">)</span><span·class="p">.</span><span·class="w">359 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1309239626-18">(</span><span·class="ss">state</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1309239626-19">{</span><span·class="ss">filename</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">total[·...·truncated·by·diffoscope;·len:·489,·SHA:·d48e31bdfa11472e1e876d4df56151b9d3148afd9c9d799b05d924b68f7360c3·...·]-18">)</span><span·class="p">.</span><span·class="w">
360 </span><span·class="c1">%%·This·example·hook·prints·its·results·to·a·file,·see·terminate/1.</span><span·class="w">360 </span><span·class="c1">%%·This·example·hook·prints·its·results·to·a·file,·see·terminate/1.</span><span·class="w">
361 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="3325276113-20">(</span><span·class="ss">test_run</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3325276113-21">{</span><span·class="ss">total</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">skipp[·...·truncated·by·diffoscope;·len:·182,·SHA:·d7f4d97219811db82d23b98c78b88a4d83fa64ee3067a595c100dc2f1ba36afe·...·]-20">)</span><span·class="p">.</span><span·class="w">361 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1309239626-20">(</span><span·class="ss">test_run</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1309239626-21">{</span><span·class="ss">total</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">skipp[·...·truncated·by·diffoscope;·len:·182,·SHA:·4e6cb6bb6bd16b4040392e17385322ecbb7b6857f843cf274566358e07c5c9c7·...·]-20">)</span><span·class="p">.</span><span·class="w">
  
362 </span><span·class="c1">%%·Return·a·unique·id·for·this·CTH.</span><span·class="w">362 </span><span·class="c1">%%·Return·a·unique·id·for·this·CTH.</span><span·class="w">
363 </span><span·class="c1">%%·Using·the·filename·means·the·hook·can·be·used·with·different</span><span·class="w">363 </span><span·class="c1">%%·Using·the·filename·means·the·hook·can·be·used·with·different</span><span·class="w">
364 </span><span·class="c1">%%·log·files·to·separate·timing·data·within·the·same·test·run.</span><span·class="w">364 </span><span·class="c1">%%·log·files·to·separate·timing·data·within·the·same·test·run.</span><span·class="w">
365 </span><span·class="c1">%%·See·Installing·a·CTH·for·more·information.</span><span·class="w">365 </span><span·class="c1">%%·See·Installing·a·CTH·for·more·information.</span><span·class="w">
366 </span><span·class="nf">id</span><span·class="p"·data-group-id="3325276113-22">(</span><span·class="n">Opts</span><span·class="p"·data-group-id="3325276113-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">366 </span><span·class="nf">id</span><span·class="p"·data-group-id="1309239626-22">(</span><span·class="n">Opts</span><span·class="p"·data-group-id="1309239626-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
367 ····</span><span·class="c1">%%·the·path·is·relative·to·the·test·run·directory</span><span·class="w">367 ····</span><span·class="c1">%%·the·path·is·relative·to·the·test·run·directory</span><span·class="w">
368 ····</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="3325276113-23">(</span><span·class="ss">filename</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;example_cth.log&quot;</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·102d8944ba8718d67af7d86a3910aa37e10b2bf01dab56d80ebcbb3edc77d48a·...·]-23">)</span><span·class="p">.</span><span·class="w">368 ····</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="1309239626-23">(</span><span·class="ss">filename</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opts</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;example_cth.log&quot;</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·49a30c9d8bb4170d403ee1ae243b14f213bbf5436ab22bd2103b1e076eb2a65d·...·]-23">)</span><span·class="p">.</span><span·class="w">
  
369 </span><span·class="c1">%%·Always·called·before·any·other·callback·function.·Use·this·to·initiate</span><span·class="w">369 </span><span·class="c1">%%·Always·called·before·any·other·callback·function.·Use·this·to·initiate</span><span·class="w">
370 </span><span·class="c1">%%·any·common·state.</span><span·class="w">370 </span><span·class="c1">%%·any·common·state.</span><span·class="w">
371 </span><span·class="nf">init</span><span·class="p"·data-group-id="3325276113-24">(</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Opts</span><span·class="p"·data-group-id="3325276113-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">371 </span><span·class="nf">init</span><span·class="p"·data-group-id="1309239626-24">(</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Opts</span><span·class="p"·data-group-id="1309239626-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
372 ····</span><span·class="p"·data-group-id="3325276113-25">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="3325276113-26">{</span><span·class="ss">filename</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·602,·SHA:·d0c5c09172ae19848f6bf0cccb45ea7e1f1f2925e23818fb4f0b5b6742443070·...·]-25">}</span><span·class="p">.</span><span·class="w">372 ····</span><span·class="p"·data-group-id="1309239626-25">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="1309239626-26">{</span><span·class="ss">filename</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·602,·SHA:·34f07aced1495af0d2357ac28f03cd0355f76523f6d9fc1e518282a442787c38·...·]-25">}</span><span·class="p">.</span><span·class="w">
  
373 </span><span·class="c1">%%·Called·before·init_per_suite·is·called.</span><span·class="w">373 </span><span·class="c1">%%·Called·before·init_per_suite·is·called.</span><span·class="w">
374 </span><span·class="nf">pre_init_per_suite</span><span·class="p"·data-group-id="3325276113-28">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-group-id="3325276113-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">374 </span><span·class="nf">pre_init_per_suite</span><span·class="p"·data-group-id="1309239626-28">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-group-id="1309239626-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
375 ····</span><span·class="p"·data-group-id="3325276113-29">{</span><span·class="n">Config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="3325276113-30">{</span><span·class="ss">suit[·...·truncated·by·diffoscope;·len:·461,·SHA:·79e63dc789de7ae1ce5e216d5746f2f67eb9bb73842ee22eba612874268182d0·...·]-29">}</span><span·class="p">.</span><span·class="w">375 ····</span><span·class="p"·data-group-id="1309239626-29">{</span><span·class="n">Config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="1309239626-30">{</span><span·class="ss">suit[·...·truncated·by·diffoscope;·len:·461,·SHA:·a4d82c02da507e746efb0b58230780a68a72edc7248ceadfe000afd42b18205c·...·]-29">}</span><span·class="p">.</span><span·class="w">
  
376 </span><span·class="c1">%%·Called·after·end_per_suite.</span><span·class="w">376 </span><span·class="c1">%%·Called·after·end_per_suite.</span><span·class="w">
377 </span><span·class="nf">post_end_per_suite</span><span·class="p"·data-group-id="3325276113-32">(</span><span·class="n">Suite</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">Return</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·62729b0414105c31babb9b122b2ac5b685557e4d38f4fb09579d88a30336c174·...·]-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">377 </span><span·class="nf">post_end_per_suite</span><span·class="p"·data-group-id="1309239626-32">(</span><span·class="n">Suite</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">Return</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·9a56a113698713450bda10edf4d9c7f6a751042fbbcc02a2daa0e107b046a97e·...·]-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
378 ····</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3325276113-33">{</span><span·class="ss">suites</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">suite_total</span><span·class="p">,</span><span·class="w">378 ····</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1309239626-33">{</span><span·class="ss">suites</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">suite_total</span><span·class="p">,</span><span·class="w">
379 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="3325276113-34">(</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">tcs</span><span·class="p"·data-group-id="3325276113-34">)</span><span·class="p"·data-group-id="3325276113-33">}</span><span·class="p">,</span><span·class="w">379 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="1309239626-34">(</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">tcs</span><span·class="p"·data-group-id="1309239626-34">)</span><span·class="p"·data-group-id="1309239626-33">}</span><span·class="p">,</span><span·class="w">
380 ····</span><span·class="p"·data-group-id="3325276113-35">{</span><span·class="n">Return</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="3325276113-36">{</span><span·class="ss">data[·...·truncated·by·diffoscope;·len:·406,·SHA:·f7df8c0228d2f51e7f8c857f134f704fd24d01e6db84f23bd8f51f3041234596·...·]-37">]</span><span·class="p">,</span><span·class="w">380 ····</span><span·class="p"·data-group-id="1309239626-35">{</span><span·class="n">Return</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="1309239626-36">{</span><span·class="ss">data[·...·truncated·by·diffoscope;·len:·406,·SHA:·5431abb7c701697d9d385b6adeb392b3fd583b58caf0abcc7abafc7a07cfb58b·...·]-37">]</span><span·class="p">,</span><span·class="w">
381 ·························</span><span·class="ss">total</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">total</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">suite_total</span><span·class="p"·data-group-id="3325276113-36">}</span><span·class="p"·data-group-id="3325276113-35">}</span><span·class="p">.</span><span·class="w">381 ·························</span><span·class="ss">total</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">total</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">suite_total</span><span·class="p"·data-group-id="1309239626-36">}</span><span·class="p"·data-group-id="1309239626-35">}</span><span·class="p">.</span><span·class="w">
  
382 </span><span·class="c1">%%·Called·before·each·init_per_testcase.</span><span·class="w">382 </span><span·class="c1">%%·Called·before·each·init_per_testcase.</span><span·class="w">
383 </span><span·class="nf">pre_init_per_testcase</span><span·class="p"·data-group-id="3325276113-38">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">State</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·2ce271543a4aa00c5f619955d88a69810ab965f9f550647b43d25e034f9b8a94·...·]-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">383 </span><span·class="nf">pre_init_per_testcase</span><span·class="p"·data-group-id="1309239626-38">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">State</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·fb9a5b62db09f652ce7a0e9c1ea479ff2076c9e56da2ce62c52a079d00b14323·...·]-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
384 ····</span><span·class="n">Now</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="3325276113-39">(</span><span·class="ss">microsecond</span><span·class="p"·data-group-id="3325276113-39">)</span><span·class="p">,</span><span·class="w">384 ····</span><span·class="n">Now</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="1309239626-39">(</span><span·class="ss">microsecond</span><span·class="p"·data-group-id="1309239626-39">)</span><span·class="p">,</span><span·class="w">
385 ····</span><span·class="p"·data-group-id="3325276113-40">{</span><span·class="n">Config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="3325276113-41">{</span><span·class="ss">ts</[·...·truncated·by·diffoscope;·len:·590,·SHA:·d7debb8b93d0fcd258c442ce1c29a79f8a5e250b1558c4037f0c369a00eb65ec·...·]-40">}</span><span·class="p">.</span><span·class="w">385 ····</span><span·class="p"·data-group-id="1309239626-40">{</span><span·class="n">Config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="1309239626-41">{</span><span·class="ss">ts</[·...·truncated·by·diffoscope;·len:·590,·SHA:·44b0e6801c351b9dea90fbc479b7d61909557b9e99dbbcadf2de5b93e7e3991f·...·]-40">}</span><span·class="p">.</span><span·class="w">
  
386 </span><span·class="c1">%%·Called·after·each·end_per_testcase.</span><span·class="w">386 </span><span·class="c1">%%·Called·after·each·end_per_testcase.</span><span·class="w">
387 </span><span·class="nf">post_end_per_testcase</span><span·class="p"·data-group-id="3325276113-42">(</span><span·class="n">Suite</span><span·class="p">,</span><span·class="n">TC</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">Return</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·67,·SHA:·55ebb3537aece23c8b8492aca007a730e5cf2891e84660db4c03b71d75ac7b45·...·]-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">387 </span><span·class="nf">post_end_per_testcase</span><span·class="p"·data-group-id="1309239626-42">(</span><span·class="n">Suite</span><span·class="p">,</span><span·class="n">TC</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Config</span><span·class="p">,</span><span·class="n">Return</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·67,·SHA:·adcec89d190b903014fd6ec03e0c3aadaeb00a96da67e74a20440a511ccc9788·...·]-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
388 ····</span><span·class="n">Now</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="3325276113-43">(</span><span·class="ss">microsecond</span><span·class="p"·data-group-id="3325276113-43">)</span><span·class="p">,</span><span·class="w">388 ····</span><span·class="n">Now</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="1309239626-43">(</span><span·class="ss">microsecond</span><span·class="p"·data-group-id="1309239626-43">)</span><span·class="p">,</span><span·class="w">
389 ····</span><span·class="n">TCInfo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3325276113-44">{</span><span·class="ss">testcase</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·343,·SHA:·be1f43118733360d7fcc0afbd99c899f3fc18e0801d572e3dfca6cdf71764918·...·]-44">}</span><span·class="p">,</span><span·class="w">389 ····</span><span·class="n">TCInfo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1309239626-44">{</span><span·class="ss">testcase</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·343,·SHA:·bd1dd478db62e4bd8ca39449a2e9c6638682407b3dddcf7d05556a769eeb7d46·...·]-44">}</span><span·class="p">,</span><span·class="w">
390 ····</span><span·class="p"·data-group-id="3325276113-45">{</span><span·class="n">Return</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="3325276113-46">{</span><span·class="ss">ts</[·...·truncated·by·diffoscope;·len:·693,·SHA:·ca0125f0c985f844b87b4fd96ea33c3e2010dafff650b95d26b05015d300a7f3·...·]-45">}</span><span·class="p">.</span><span·class="w">390 ····</span><span·class="p"·data-group-id="1309239626-45">{</span><span·class="n">Return</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="1309239626-46">{</span><span·class="ss">ts</[·...·truncated·by·diffoscope;·len:·693,·SHA:·f1a25a3022aa00259fb20a7accbe5d36c21c2a0030aa001160294223f37e09f9·...·]-45">}</span><span·class="p">.</span><span·class="w">
  
391 </span><span·class="c1">%%·Called·when·a·test·case·is·skipped·by·either·user·action</span><span·class="w">391 </span><span·class="c1">%%·Called·when·a·test·case·is·skipped·by·either·user·action</span><span·class="w">
392 </span><span·class="c1">%%·or·due·to·an·init·function·failing.</span><span·class="w">392 </span><span·class="c1">%%·or·due·to·an·init·function·failing.</span><span·class="w">
393 </span><span·class="nf">on_tc_skip</span><span·class="p"·data-group-id="3325276113-48">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class=[·...·truncated·by·diffoscope;·len:·134,·SHA:·2d17ac1e495df0f20da79814c1594ca3f2874dc2e71f327b67b5b4fcd58cfd9f·...·]-48">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">393 </span><span·class="nf">on_tc_skip</span><span·class="p"·data-group-id="1309239626-48">(</span><span·class="p">_</span><span·class="n">Suite</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">TC</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class=[·...·truncated·by·diffoscope;·len:·134,·SHA:·ca5eddccbba705331307cd465da2f938868d4e6a5bfdce601a76e69de615bf02·...·]-48">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
394 ····</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="3325276113-49">{</span><span·class="ss">skipped</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">skipped<[·...·truncated·by·diffoscope;·len:·144,·SHA:·2a43f91edd784a6c1a13e3c380c51c7dab5e965f3867dba3c8c3eb1b2e4a0f14·...·]-49">}</span><span·class="p">.</span><span·class="w">394 ····</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p"·data-group-id="1309239626-49">{</span><span·class="ss">skipped</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">skipped<[·...·truncated·by·diffoscope;·len:·144,·SHA:·a8604314ea06d9d8e48ba42330c50ae5c86ed089dc7d40474fe6917311b7aaee·...·]-49">}</span><span·class="p">.</span><span·class="w">
  
395 </span><span·class="c1">%%·Called·when·the·scope·of·the·CTH·is·done.</span><span·class="w">395 </span><span·class="c1">%%·Called·when·the·scope·of·the·CTH·is·done.</span><span·class="w">
396 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="3325276113-50">(</span><span·class="n">State</span><span·class="p"·data-group-id="3325276113-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">396 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="1309239626-50">(</span><span·class="n">State</span><span·class="p"·data-group-id="1309239626-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
397 ····</span><span·class="c1">%%·use·append·to·avoid·data·loss·if·the·path·is·reused</span><span·class="w">397 ····</span><span·class="c1">%%·use·append·to·avoid·data·loss·if·the·path·is·reused</span><span·class="w">
398 ····</span><span·class="p"·data-group-id="3325276113-51">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="3325276113-51">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·569,·SHA:·f5512ee64954b47abe8f58dbb6006216c7d91f0f28cbcba702d0a0aab5a1f816·...·]-52">)</span><span·class="p">,</span><span·class="w">398 ····</span><span·class="p"·data-group-id="1309239626-51">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="1309239626-51">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·569,·SHA:·5024b42faeccb3451a90890afa59967246776eb723242ab1b8b8c04d69d9a52f·...·]-52">)</span><span·class="p">,</span><span·class="w">
399 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3325276113-54">(</span><span·class="n">File</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">.</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·340,·SHA:·d5ff628070149e956fdf2d47219c900380c92d777ca04761976e518e83faf075·...·]-54">)</span><span·class="p">,</span><span·class="w">399 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1309239626-54">(</span><span·class="n">File</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">.</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·340,·SHA:·6ef308a6ce4403c28cdb6e79a0143d35ed431987a119c54109795a0fd4e67347·...·]-54">)</span><span·class="p">,</span><span·class="w">
400 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3325276113-57">(</span><span·class="n">File</span><span·class="p"·data-group-id="3325276113-57">)</span><span·class="p">,</span><span·class="w">400 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1309239626-57">(</span><span·class="n">File</span><span·class="p"·data-group-id="1309239626-57">)</span><span·class="p">,</span><span·class="w">
401 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">401 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
402 </span><span·class="nf">results</span><span·class="p"·data-group-id="3325276113-58">(</span><span·class="n">State</span><span·class="p"·data-group-id="3325276113-58">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">402 </span><span·class="nf">results</span><span·class="p"·data-group-id="1309239626-58">(</span><span·class="n">State</span><span·class="p"·data-group-id="1309239626-58">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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434 ······<div·class="specs">434 ······<div·class="specs">
  
435 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_event_mgr_ref()·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>().</pre>435 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_event_mgr_ref()·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>().</pre>
  
436 ······</div>436 ······</div>
  
437 <p>Gets·a·reference·to·the·<code·class="inline">Common·Test</code>·master·event·manager.·The·reference·can·be437 <p>Gets·a·reference·to·the·<code·class="inline">Common·Test</code>·master·event·manager.·The·reference·can·be
438 used·to,·for·example,·add·a·user-specific·event·handler·while·tests·are·running.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="6782192619-1">(</span><span·class="nc">ct_master</span><span·class="p">:</span><span·class="nf">get_event_mgr_ref</span><span·class="p"·data-group-id="6782192619-2">(</span><span·class="p"·data-group-id="6782192619-2">)</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·244,·SHA:·420e4edffd07c066ef38a86579c2837a7e2abc9d0a80bb244340f721c3cc8260·...·]-1">)</span></code></pre>438 used·to,·for·example,·add·a·user-specific·event·handler·while·tests·are·running.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gen_event</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="9107047490-1">(</span><span·class="nc">ct_master</span><span·class="p">:</span><span·class="nf">get_event_mgr_ref</span><span·class="p"·data-group-id="9107047490-2">(</span><span·class="p"·data-group-id="9107047490-2">)</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·244,·SHA:·6b51e0573b8e6828eac13185d8c41c8703a8b8fd8863733be7e03a883ea18ad4·...·]-1">)</span></code></pre>
439 ··</section>439 ··</section>
440 </section>440 </section>
441 <section·class="detail"·id="progress/0">441 <section·class="detail"·id="progress/0">
  
442 ··<div·class="detail-header">442 ··<div·class="detail-header">
443 ····<a·href="#progress/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">443 ····<a·href="#progress/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
444 ······<i·class="ri-link-m"·aria-hidden="true"></i>444 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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770 ······<p·class="built-using">770 ······<p·class="built-using">
771 ········Built·using771 ········Built·using
772 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the772 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
773 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>773 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
774 ······</p>774 ······</p>
775 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>775 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
776 ····</footer>776 ····</footer>
777 ··</div>777 ··</div>
778 </main>778 </main>
779 </div>779 </div>
780 <script>780 <script>
781 ··function·mermaidLoaded()·{781 ··function·mermaidLoaded()·{
782 ····mermaid.initialize({782 ····mermaid.initialize({
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152 a·common·file·system.·<code·class="inline">Common·Test</code>·Master·cannot·start·test·nodes152 a·common·file·system.·<code·class="inline">Common·Test</code>·Master·cannot·start·test·nodes
153 automatically.·The·nodes·must·be·started·in·advance·for·<code·class="inline">Common·Test</code>·Master·to153 automatically.·The·nodes·must·be·started·in·advance·for·<code·class="inline">Common·Test</code>·Master·to
154 be·able·to·start·test·sessions·on·them.</p><p>Tests·are·started·by·calling·<a·href="ct_master.html#run/1"><code·class="inline">ct_master:run(TestSpecs)</code></a>·or154 be·able·to·start·test·sessions·on·them.</p><p>Tests·are·started·by·calling·<a·href="ct_master.html#run/1"><code·class="inline">ct_master:run(TestSpecs)</code></a>·or
155 <a·href="ct_master.html#run/3"><code·class="inline">ct_master:run(TestSpecs,·InclNodes,·ExclNodes)</code></a></p><p><code·class="inline">TestSpecs</code>·is·either·the·name·of·a·test·specification·file·(string)·or·a·list155 <a·href="ct_master.html#run/3"><code·class="inline">ct_master:run(TestSpecs,·InclNodes,·ExclNodes)</code></a></p><p><code·class="inline">TestSpecs</code>·is·either·the·name·of·a·test·specification·file·(string)·or·a·list
156 of·test·specifications.·If·it·is·a·list,·the·specifications·are·handled·(and·the156 of·test·specifications.·If·it·is·a·list,·the·specifications·are·handled·(and·the
157 corresponding·tests·executed)·in·sequence.·An·element·in·a·<code·class="inline">TestSpecs</code>·list·can157 corresponding·tests·executed)·in·sequence.·An·element·in·a·<code·class="inline">TestSpecs</code>·list·can
158 also·be·list·of·test·specifications.·The·specifications·in·such·a·list·are158 also·be·list·of·test·specifications.·The·specifications·in·such·a·list·are
159 merged·into·one·combined·specification·before·test·execution.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct_master</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="1212052573-1">(</span><span·class="p"·data-group-id="1212052573-2">[</span><span·class="s">&quot;ts1&quot;</span><span·class="p">,</span><span·class="s">&quot;ts2&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1212052573-3">[</span><spa[·...·truncated·by·diffoscope;·len:·243,·SHA:·0889af62a4409496973798d24c69fe4545362810d5c63027bc7da75db87167fa·...·]-1">)</span></code></pre><p>Here,·the·tests·specified·by·&quot;ts1&quot;·run·first,·then·the·tests·specified·by·&quot;ts2&quot;,159 merged·into·one·combined·specification·before·test·execution.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ct_master</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="9737567492-1">(</span><span·class="p"·data-group-id="9737567492-2">[</span><span·class="s">&quot;ts1&quot;</span><span·class="p">,</span><span·class="s">&quot;ts2&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="9737567492-3">[</span><spa[·...·truncated·by·diffoscope;·len:·243,·SHA:·a2ce4bbcf496cb00041c8f85edb0501c9b7ff18b54afdf45fcdb84a32c122df2·...·]-1">)</span></code></pre><p>Here,·the·tests·specified·by·&quot;ts1&quot;·run·first,·then·the·tests·specified·by·&quot;ts2&quot;,
160 and·finally·the·tests·specified·by·both·&quot;ts3&quot;·and·&quot;ts4&quot;.</p><p>The·<code·class="inline">InclNodes</code>·argument·to·<code·class="inline">run/3</code>·is·a·list·of·node·names.·Function·<code·class="inline">run/3</code>160 and·finally·the·tests·specified·by·both·&quot;ts3&quot;·and·&quot;ts4&quot;.</p><p>The·<code·class="inline">InclNodes</code>·argument·to·<code·class="inline">run/3</code>·is·a·list·of·node·names.·Function·<code·class="inline">run/3</code>
161 runs·the·tests·in·<code·class="inline">TestSpecs</code>·just·like·<code·class="inline">run/1</code>,·but·also·takes·any·test·in161 runs·the·tests·in·<code·class="inline">TestSpecs</code>·just·like·<code·class="inline">run/1</code>,·but·also·takes·any·test·in
162 <code·class="inline">TestSpecs</code>,·which·is·not·explicitly·tagged·with·a·particular·node·name,·and162 <code·class="inline">TestSpecs</code>,·which·is·not·explicitly·tagged·with·a·particular·node·name,·and
163 execute·it·on·the·nodes·listed·in·<code·class="inline">InclNodes</code>.·By·using·<code·class="inline">run/3</code>·this·way,·any163 execute·it·on·the·nodes·listed·in·<code·class="inline">InclNodes</code>.·By·using·<code·class="inline">run/3</code>·this·way,·any
164 test·specification·can·be·used,·with·or·without·node·information,·in·a164 test·specification·can·be·used,·with·or·without·node·information,·in·a
165 large-scale·test·environment.</p><p><code·class="inline">ExclNodes</code>·is·a·list·of·nodes·to·be·excluded·from·the·test.·That·is,·tests·that165 large-scale·test·environment.</p><p><code·class="inline">ExclNodes</code>·is·a·list·of·nodes·to·be·excluded·from·the·test.·That·is,·tests·that
166 are·specified·in·the·test·specification·to·run·on·a·particular·node·are·not166 are·specified·in·the·test·specification·to·run·on·a·particular·node·are·not
Offset 192, 40 lines modifiedOffset 192, 40 lines modified
192 achieved·using·constants).·The·alias·is·declared·with·a·<code·class="inline">node</code>·term·as·follows:</p><p><code·class="inline">{node,·NodeAlias,·NodeName}</code></p><p>If·<code·class="inline">NodeRefs</code>·has·the·value·<code·class="inline">all_nodes</code>,·the·operation·or·test·is·performed·on192 achieved·using·constants).·The·alias·is·declared·with·a·<code·class="inline">node</code>·term·as·follows:</p><p><code·class="inline">{node,·NodeAlias,·NodeName}</code></p><p>If·<code·class="inline">NodeRefs</code>·has·the·value·<code·class="inline">all_nodes</code>,·the·operation·or·test·is·performed·on
193 all·specified·test·nodes.·(Declaring·a·term·without·a·<code·class="inline">NodeRefs</code>·element·has·the193 all·specified·test·nodes.·(Declaring·a·term·without·a·<code·class="inline">NodeRefs</code>·element·has·the
194 same·effect).·If·<code·class="inline">NodeRefs</code>·has·the·value·<code·class="inline">master</code>,·the·operation·is·only194 same·effect).·If·<code·class="inline">NodeRefs</code>·has·the·value·<code·class="inline">master</code>,·the·operation·is·only
195 performed·on·the·<code·class="inline">Common·Test</code>·Master·node·(namely·set·the·log·directory·or195 performed·on·the·<code·class="inline">Common·Test</code>·Master·node·(namely·set·the·log·directory·or
196 install·an·event·handler).</p><p>Consider·the·example·in·section196 install·an·event·handler).</p><p>Consider·the·example·in·section
197 <a·href="run_test_chapter.html#test_specifications">Test·Specifications</a>·in·section197 <a·href="run_test_chapter.html#test_specifications">Test·Specifications</a>·in·section
198 Running·Tests·and·Analysing·Results,·now·extended·with·node·information·and198 Running·Tests·and·Analysing·Results,·now·extended·with·node·information·and
199 intended·to·be·executed·by·<code·class="inline">Common·Test</code>·Master:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7872775324-1">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Top&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/test&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·14,·SHA:·bc5f77a27476fbc7ee77c2f7b702e721712adab458bf3c4d8c1ac10613580d64·...·]4-1">}</span><span·class="p">.</span><span·class="w">199 intended·to·be·executed·by·<code·class="inline">Common·Test</code>·Master:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0697969544-1">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Top&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/test&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·14,·SHA:·aead794c7496b25bef354053edde7c507fc10a0ab368480f23931e723865e738·...·]4-1">}</span><span·class="p">.</span><span·class="w">
200 </span><span·class="p"·data-group-id="7872775324-2">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/t1&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·7633d443c2702bb09d49135c3f956644d87043c8f7b8a78da975760504dc078a·...·]4-2">}</span><span·class="p">.</span><span·class="w">200 </span><span·class="p"·data-group-id="0697969544-2">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/t1&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·c55adb53954a2502d35ee58822b594ae601423fb11f2b6227069ce9c4b2669d5·...·]4-2">}</span><span·class="p">.</span><span·class="w">
201 </span><span·class="p"·data-group-id="7872775324-3">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/t2&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·7633d443c2702bb09d49135c3f956644d87043c8f7b8a78da975760504dc078a·...·]4-3">}</span><span·class="p">.</span><span·class="w">201 </span><span·class="p"·data-group-id="0697969544-3">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/t2&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·c55adb53954a2502d35ee58822b594ae601423fb11f2b6227069ce9c4b2669d5·...·]4-3">}</span><span·class="p">.</span><span·class="w">
202 </span><span·class="p"·data-group-id="7872775324-4">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T3&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/t3&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·7633d443c2702bb09d49135c3f956644d87043c8f7b8a78da975760504dc078a·...·]4-4">}</span><span·class="p">.</span><span·class="w">202 </span><span·class="p"·data-group-id="0697969544-4">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T3&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/t3&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·19,·SHA:·c55adb53954a2502d35ee58822b594ae601423fb11f2b6227069ce9c4b2669d5·...·]4-4">}</span><span·class="p">.</span><span·class="w">
203 </span><span·class="p"·data-group-id="7872775324-5">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;CfgFile&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;config.cfg&quot;</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·18,·SHA:·e989dfd84acad26b910b8eef47508b2f272f5257c17fe4a09c64a29692850348·...·]4-5">}</span><span·class="p">.</span><span·class="w">203 </span><span·class="p"·data-group-id="0697969544-5">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;CfgFile&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;config.cfg&quot;</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·18,·SHA:·d4bb1ed50fba72035d3f70ffa1779d7389faba8aa0bdebf94fcb8ae79187e9ae·...·]4-5">}</span><span·class="p">.</span><span·class="w">
204 </span><span·class="p"·data-group-id="7872775324-6">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Node&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ct_node</span><span·class="p"·data-group-id="78727753[·...·truncated·by·diffoscope;·len:·1,·SHA:·d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35·...·]4-6">}</span><span·class="p">.</span><span·class="w">204 </span><span·class="p"·data-group-id="0697969544-6">{</span><span·class="ss">define</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Node&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ct_node</span><span·class="p"·data-group-id="06979695[·...·truncated·by·diffoscope;·len:·1,·SHA:·4b227777d4dd1fc61c6f884f48641d02b4d121d3fd328cb08b5531fcacdabf8a·...·]4-6">}</span><span·class="p">.</span><span·class="w">
  
205 </span><span·class="p"·data-group-id="7872775324-7">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Node@host_x&#39;</span><span·class="p"·data-group-id="78727[·...·truncated·by·diffoscope;·len:·4,·SHA:·38d0f423e4089ea4202f1c1ba576f033f05a88dab38c8d527e8699a2aad5e80a·...·]4-7">}</span><span·class="p">.</span><span·class="w">205 </span><span·class="p"·data-group-id="0697969544-7">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Node@host_x&#39;</span><span·class="p"·data-group-id="06979[·...·truncated·by·diffoscope;·len:·4,·SHA:·da6a103cafcf90f7aa01c49cbf858937b313fae062c8827ea7b519bdaa16c88e·...·]4-7">}</span><span·class="p">.</span><span·class="w">
206 </span><span·class="p"·data-group-id="7872775324-8">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Node@host_y&#39;</span><span·class="p"·data-group-id="78727[·...·truncated·by·diffoscope;·len:·4,·SHA:·38d0f423e4089ea4202f1c1ba576f033f05a88dab38c8d527e8699a2aad5e80a·...·]4-8">}</span><span·class="p">.</span><span·class="w">206 </span><span·class="p"·data-group-id="0697969544-8">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Node@host_y&#39;</span><span·class="p"·data-group-id="06979[·...·truncated·by·diffoscope;·len:·4,·SHA:·da6a103cafcf90f7aa01c49cbf858937b313fae062c8827ea7b519bdaa16c88e·...·]4-8">}</span><span·class="p">.</span><span·class="w">
  
207 </span><span·class="p"·data-group-id="7872775324-9">{</span><span·class="ss">logdir</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">master</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/master_logs&quot;</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·22,·SHA:·1a25a6ffadbd7e64ec6a039d0aae9099f3ba8d6a34b5fa6ed45b7d7bfc65fa9e·...·]4-9">}</span><span·class="p">.</span><span·class="w">207 </span><span·class="p"·data-group-id="0697969544-9">{</span><span·class="ss">logdir</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">master</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/master_logs&quot;</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·22,·SHA:·f5382871abe3339f3956aefadf74ab3bc4d8197e79874bb4cc67b6f17a97f9bf·...·]4-9">}</span><span·class="p">.</span><span·class="w">
208 </span><span·class="p"·data-group-id="7872775324-10">{</span><span·class="ss">logdir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/logs&quot;</span><span·class="p"·data-group-id="7872775324-10">}</span><span·class="p">.</span><span·class="w">208 </span><span·class="p"·data-group-id="0697969544-10">{</span><span·class="ss">logdir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;Top&#39;/logs&quot;</span><span·class="p"·data-group-id="0697969544-10">}</span><span·class="p">.</span><span·class="w">
  
209 </span><span·class="p"·data-group-id="7872775324-11">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;T1&#39;/&#39;CfgFile&#39;&quot;</span><span·class="[·...·truncated·by·diffoscope;·len:·27,·SHA:·8342ceb3b99731f865b9df19b8a9ee3b0330df1b13b309f4b43ad0a52d622189·...·]4-11">}</span><span·class="p">.</span><span·class="w">209 </span><span·class="p"·data-group-id="0697969544-11">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;T1&#39;/&#39;CfgFile&#39;&quot;</span><span·class="[·...·truncated·by·diffoscope;·len:·27,·SHA:·654ca358d5bdf495fec214db82acb18561c482d70cc95418bf473cbd0ae2055d·...·]4-11">}</span><span·class="p">.</span><span·class="w">
210 </span><span·class="p"·data-group-id="7872775324-12">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;T2&#39;/&#39;CfgFile&#39;&quot;</span><span·class="[·...·truncated·by·diffoscope;·len:·27,·SHA:·8342ceb3b99731f865b9df19b8a9ee3b0330df1b13b309f4b43ad0a52d622189·...·]4-12">}</span><span·class="p">.</span><span·class="w">210 </span><span·class="p"·data-group-id="0697969544-12">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;T2&#39;/&#39;CfgFile&#39;&quot;</span><span·class="[·...·truncated·by·diffoscope;·len:·27,·SHA:·654ca358d5bdf495fec214db82acb18561c482d70cc95418bf473cbd0ae2055d·...·]4-12">}</span><span·class="p">.</span><span·class="w">
211 </span><span·class="p"·data-group-id="7872775324-13">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;T3&#39;/&#39;CfgFile&#39;&quot;</span><span·class="p"·data-group-id="7872775324-13">}</span><span·class="p">.</span><span·class="w">211 </span><span·class="p"·data-group-id="0697969544-13">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&#39;T3&#39;/&#39;CfgFile&#39;&quot;</span><span·class="p"·data-group-id="0697969544-13">}</span><span·class="p">.</span><span·class="w">
  
212 </span><span·class="p"·data-group-id="7872775324-14">{</span><span·class="ss">suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·73,·SHA:·eb0286204040dcd95b6ec36ce65dcbc0a89f21c3e35f6ce2d8742308ee9e0478·...·]4-14">}</span><span·class="p">.</span><span·class="w">212 </span><span·class="p"·data-group-id="0697969544-14">{</span><span·class="ss">suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·73,·SHA:·c336256582644efb952076ccfebb8be4b49259786ec95957de101c64679cf394·...·]4-14">}</span><span·class="p">.</span><span·class="w">
213 </span><span·class="p"·data-group-id="7872775324-15">{</span><span·class="ss">skip_suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·347,·SHA:·2ef9f3684f224a462439f89e6cae18499e2297f199ba069f372618eee1ed7bf9·...·]4-15">}</span><span·class="p">.</span><span·class="w">213 </span><span·class="p"·data-group-id="0697969544-15">{</span><span·class="ss">skip_suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·347,·SHA:·0ff48d7e0812e15051abc16374884213da7d125b52466284718a7fab146dfb1c·...·]4-15">}</span><span·class="p">.</span><span·class="w">
214 </span><span·class="p"·data-group-id="7872775324-17">{</span><span·class="ss">skip_cases</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·414,·SHA:·bf28d1afd2ba0bec5ef58957cc4e6dea45a979d8fb7738423f8e94823efa97e8·...·]4-17">}</span><span·class="p">.</span><span·class="w">214 </span><span·class="p"·data-group-id="0697969544-17">{</span><span·class="ss">skip_cases</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·414,·SHA:·b7c65a7dfabb9628e893db84455e19699523bf6242eb42dafe7bbb446c552fa9·...·]4-17">}</span><span·class="p">.</span><span·class="w">
215 </span><span·class="p"·data-group-id="7872775324-19">{</span><span·class="ss">skip_cases</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·357,·SHA:·1d2d5d216a49df41bdc487635c927dedcc84c0a24d0b2351e1434cc72cda4e2e·...·]4-19">}</span><span·class="p">.</span><span·class="w">215 </span><span·class="p"·data-group-id="0697969544-19">{</span><span·class="ss">skip_cases</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T1&#39;</span><span·class="p">,</span><span·class="w[·...·truncated·by·diffoscope;·len:·357,·SHA:·aa67a6cbd99ecb56228dbe02d5f7d4dda90ab15a5e113a211b25ffe78c8aea9d·...·]4-19">}</span><span·class="p">.</span><span·class="w">
  
216 </span><span·class="p"·data-group-id="7872775324-21">{</span><span·class="ss">suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T2&#39;</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·244,·SHA:·b100ab503b63b61e47d98956f7b7ab1fc2a03ed25e0d1cc2aaf5817d454ea87b·...·]4-21">}</span><span·class="p">.</span><span·class="w">216 </span><span·class="p"·data-group-id="0697969544-21">{</span><span·class="ss">suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T2&#39;</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·244,·SHA:·82d7713eeea770c6c86c7fe150224a2389b46e853aca26e4a6732dc2718bc828·...·]4-21">}</span><span·class="p">.</span><span·class="w">
217 </span><span·class="p"·data-group-id="7872775324-23">{</span><span·class="ss">cases</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T2&#39;</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·369,·SHA:·f5f42945920454fc82355c3b873d16103d8922fa57bbbe3c333440fb7a35ccd9·...·]4-23">}</span><span·class="p">.</span><span·class="w">217 </span><span·class="p"·data-group-id="0697969544-23">{</span><span·class="ss">cases</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T2&#39;</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·369,·SHA:·fc13aad13654b1cfb9a643d9655da9a37de43ef35d189b647fad3e3903cb3823·...·]4-23">}</span><span·class="p">.</span><span·class="w">
  
218 </span><span·class="p"·data-group-id="7872775324-25">{</span><span·class="ss">skip_suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T3&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·99,·SHA:·d2f7565aaa38e686b78c90c8ecb16164c9d2ddd24d31a249a1c05c9ea65df030·...·]4-25">}</span><span·class="p">.</span></code></pre><p>This·example·specifies·the·same·tests·as·the·original·example.·But·now·if218 </span><span·class="p"·data-group-id="0697969544-25">{</span><span·class="ss">skip_suites</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;T3&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·99,·SHA:·be1042605c74a7a5e75b2759d1f45a5fa8f42aa5cadf1c9b94ec105c277d6de6·...·]4-25">}</span><span·class="p">.</span></code></pre><p>This·example·specifies·the·same·tests·as·the·original·example.·But·now·if
219 started·with·a·call·to·<code·class="inline">ct_master:run(TestSpecName)</code>,·test·<code·class="inline">t1</code>·is·executed·on219 started·with·a·call·to·<code·class="inline">ct_master:run(TestSpecName)</code>,·test·<code·class="inline">t1</code>·is·executed·on
220 node·<code·class="inline">ct_node@host_x</code>·(<code·class="inline">node1</code>),·test·<code·class="inline">t2</code>·on·<code·class="inline">ct_node@host_y</code>·(<code·class="inline">node2</code>)·and220 node·<code·class="inline">ct_node@host_x</code>·(<code·class="inline">node1</code>),·test·<code·class="inline">t2</code>·on·<code·class="inline">ct_node@host_y</code>·(<code·class="inline">node2</code>)·and
221 test·<code·class="inline">t3</code>·on·both·<code·class="inline">node1</code>·and·<code·class="inline">node2</code>.·Configuration·file·<code·class="inline">t1</code>·is·only·read·on221 test·<code·class="inline">t3</code>·on·both·<code·class="inline">node1</code>·and·<code·class="inline">node2</code>.·Configuration·file·<code·class="inline">t1</code>·is·only·read·on
222 <code·class="inline">node1</code>·and·configuration·file·<code·class="inline">t2</code>·only·on·<code·class="inline">node2</code>,·while·the·configuration222 <code·class="inline">node1</code>·and·configuration·file·<code·class="inline">t2</code>·only·on·<code·class="inline">node2</code>,·while·the·configuration
223 file·<code·class="inline">t3</code>·is·read·on·both·<code·class="inline">node1</code>·and·<code·class="inline">node2</code>.·Both·test·nodes·write·log·files223 file·<code·class="inline">t3</code>·is·read·on·both·<code·class="inline">node1</code>·and·<code·class="inline">node2</code>.·Both·test·nodes·write·log·files
224 to·the·same·directory.·(However,·the·<code·class="inline">Common·Test</code>·Master·node·uses·a·different224 to·the·same·directory.·(However,·the·<code·class="inline">Common·Test</code>·Master·node·uses·a·different
225 log·directory·than·the·test·nodes.)</p><p>If·the·test·session·is·instead·started·with·a·call·to225 log·directory·than·the·test·nodes.)</p><p>If·the·test·session·is·instead·started·with·a·call·to
Offset 240, 21 lines modifiedOffset 240, 21 lines modified
240 always·performed·too,·of·course.</p><h2·id="automatic-startup-of-test-target-nodes"·class="section-heading">240 always·performed·too,·of·course.</p><h2·id="automatic-startup-of-test-target-nodes"·class="section-heading">
241 ··<a·href="#automatic-startup-of-test-target-nodes"·class="hover-link">241 ··<a·href="#automatic-startup-of-test-target-nodes"·class="hover-link">
242 ····<i·class="ri-link-m"·aria-hidden="true"></i>242 ····<i·class="ri-link-m"·aria-hidden="true"></i>
243 ··</a>243 ··</a>
244 ··<span·class="text">Automatic·Startup·of·Test·Target·Nodes</span>244 ··<span·class="text">Automatic·Startup·of·Test·Target·Nodes</span>
245 </h2>245 </h2>
246 <p><a·href=""·id="ct_slave"></a></p><p>Initial·actions·can·be·started·and·performed·automatically·on·test·target·nodes246 <p><a·href=""·id="ct_slave"></a></p><p>Initial·actions·can·be·started·and·performed·automatically·on·test·target·nodes
247 using·test·specification·term·<code·class="inline">init</code>.</p><p>Two·subterms·are·supported,·<code·class="inline">node_start</code>·and·<code·class="inline">eval</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3571485953-1">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1@host1</span><span·class="p"·data-group-id="3571485953-1">}</span><span·class="p">.</span><span·class="w">247 using·test·specification·term·<code·class="inline">init</code>.</p><p>Two·subterms·are·supported,·<code·class="inline">node_start</code>·and·<code·class="inline">eval</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8556681816-1">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1@host1</span><span·class="p"·data-group-id="8556681816-1">}</span><span·class="p">.</span><span·class="w">
248 </span><span·class="p"·data-group-id="3571485953-2">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1@host2</span><span·class="p"·data-group-id="3571485953-2">}</span><span·class="p">.</span><span·class="w">248 </span><span·class="p"·data-group-id="8556681816-2">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1@host2</span><span·class="p"·data-group-id="8556681816-2">}</span><span·class="p">.</span><span·class="w">
249 </span><span·class="p"·data-group-id="3571485953-3">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2@host2</span><span·class="p"·data-group-id="3571485953-3">}</span><span·class="p">.</span><span·class="w">249 </span><span·class="p"·data-group-id="8556681816-3">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node2@host2</span><span·class="p"·data-group-id="8556681816-3">}</span><span·class="p">.</span><span·class="w">
250 </span><span·class="p"·data-group-id="3571485953-4">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1@host3</span><span·class="p"·data-group-id="3571485953-4">}</span><span·class="p">.</span><span·class="w">250 </span><span·class="p"·data-group-id="8556681816-4">{</span><span·class="nb">node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1@host3</span><span·class="p"·data-group-id="8556681816-4">}</span><span·class="p">.</span><span·class="w">
251 </span><span·class="p"·data-group-id="3571485953-5">{</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3571485953-6">[</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·594,·SHA:·8a6de47b959851e4104df2096fae8026f46e325afbb19c4dc4ed0ce385d479ce·...·]-5">}</span><span·class="p">.</span><span·class="w">251 </span><span·class="p"·data-group-id="8556681816-5">{</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8556681816-6">[</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·594,·SHA:·4f9a32d438d627f37b760ca9f2d967380b52f5f7ebdf26a21a580e2abdfef20f·...·]-5">}</span><span·class="p">.</span><span·class="w">
252 </span><span·class="p"·data-group-id="3571485953-10">{</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3571485953-11">[</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node3</sp[·...·truncated·by·diffoscope;·len:·956,·SHA:·7a4446be1f7eb057f2e83e33e353f62c9ef907ade89687dbf5087b60e7bdadb3·...·]-10">}</span><span·class="p">.</span><span·class="w">252 </span><span·class="p"·data-group-id="8556681816-10">{</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8556681816-11">[</span><span·class="ss">node2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node3</sp[·...·truncated·by·diffoscope;·len:·956,·SHA:·200598da3fe75aa3779738dd4aad8733d4c403cd2cdfa8f1a0f1bf88cb624dd8·...·]-10">}</span><span·class="p">.</span><span·class="w">
253 </span><span·class="p"·data-group-id="3571485953-16">{</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3571485953-17">{</span><span·class="ss">eval</spa[·...·truncated·by·diffoscope;·len:·519,·SHA:·ba45077889dbcce2b6c7e2912587d3522e5c23a35964ad81ac2f925c7d92c88d·...·]-16">}</span><span·class="p">.</span></code></pre><p>This·test·specification·declares·that·<code·class="inline">node1@host1</code>·is·to·be·started·using·the253 </span><span·class="p"·data-group-id="8556681816-16">{</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8556681816-17">{</span><span·class="ss">eval</spa[·...·truncated·by·diffoscope;·len:·519,·SHA:·443b4018eaebeb4f54a8637824024a6662337ee774e75e8628da64bcd5ad22c7·...·]-16">}</span><span·class="p">.</span></code></pre><p>This·test·specification·declares·that·<code·class="inline">node1@host1</code>·is·to·be·started·using·the
254 user·callback·function·<code·class="inline">callback_module:my_slave_callback/0</code>,·and·nodes254 user·callback·function·<code·class="inline">callback_module:my_slave_callback/0</code>,·and·nodes
255 <code·class="inline">node1@host2</code>·and·<code·class="inline">node2@host2</code>·are·to·be·started·with·the·default·callback255 <code·class="inline">node1@host2</code>·and·<code·class="inline">node2@host2</code>·are·to·be·started·with·the·default·callback
256 module·<code·class="inline">ct_slave</code>.·The·specified·username·and·password·are·used·to·log·on·to256 module·<code·class="inline">ct_slave</code>.·The·specified·username·and·password·are·used·to·log·on·to
257 remote·host·<code·class="inline">host2</code>.·Also,·function·<code·class="inline">module:function/0</code>·is·evaluated·on257 remote·host·<code·class="inline">host2</code>.·Also,·function·<code·class="inline">module:function/0</code>·is·evaluated·on
258 <code·class="inline">node1@host3</code>,·and·the·result·of·this·call·is·printed·to·the·log.</p><p>The·default·callback·module·<a·href="ct_slave.html"><code·class="inline">ct_slave</code></a>,·has·the·following·features:</p><ul><li>Starting·Erlang·target·nodes·on·local·or·remote·hosts·(application·<code·class="inline">SSH</code>·is258 <code·class="inline">node1@host3</code>,·and·the·result·of·this·call·is·printed·to·the·log.</p><p>The·default·callback·module·<a·href="ct_slave.html"><code·class="inline">ct_slave</code></a>,·has·the·following·features:</p><ul><li>Starting·Erlang·target·nodes·on·local·or·remote·hosts·(application·<code·class="inline">SSH</code>·is
259 used·for·communication).</li><li>Ability·to·start·an·Erlang·emulator·with·more·flags·(any·flags·supported·by259 used·for·communication).</li><li>Ability·to·start·an·Erlang·emulator·with·more·flags·(any·flags·supported·by
260 <code·class="inline">erl</code>·are·supported).</li><li>Supervision·of·a·node·being·started·using·internal·callback·functions.·Used·to260 <code·class="inline">erl</code>·are·supported).</li><li>Supervision·of·a·node·being·started·using·internal·callback·functions.·Used·to
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310 ······<p·class="built-using">310 ······<p·class="built-using">
311 ········Built·using311 ········Built·using
312 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the312 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
313 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>313 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
314 ······</p>314 ······</p>
315 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>315 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
316 ····</footer>316 ····</footer>
317 ··</div>317 ··</div>
318 </main>318 </main>
319 </div>319 </div>
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133 and·with·support·for·RFC·5277,·NETCONF·Event·Notifications.</p><p><a·href=""·id="Connecting"></a></p><p><em>Connecting·to·a·NETCONF·server</em></p><p>Call·<a·href="#connect/1"><code·class="inline">connect/1,2</code></a>·to·establish·a·connection·to·a·server,·then133 and·with·support·for·RFC·5277,·NETCONF·Event·Notifications.</p><p><a·href=""·id="Connecting"></a></p><p><em>Connecting·to·a·NETCONF·server</em></p><p>Call·<a·href="#connect/1"><code·class="inline">connect/1,2</code></a>·to·establish·a·connection·to·a·server,·then
134 pass·the·returned·handle·to·<a·href="#session/1"><code·class="inline">session/1-3</code></a>·to·establish·a·NETCONF134 pass·the·returned·handle·to·<a·href="#session/1"><code·class="inline">session/1-3</code></a>·to·establish·a·NETCONF
135 session·on·a·new·SSH·channel.·Each·call·to·<a·href="#session/1"><code·class="inline">session/1-3</code></a>135 session·on·a·new·SSH·channel.·Each·call·to·<a·href="#session/1"><code·class="inline">session/1-3</code></a>
136 establishes·a·new·session·on·the·same·connection,·and·results·in·a·hello·message136 establishes·a·new·session·on·the·same·connection,·and·results·in·a·hello·message
137 to·the·server.</p><p>Alternately,·<a·href="#open/1"><code·class="inline">open/1,2</code></a>·can·be·used·to·establish·a·single·session·on137 to·the·server.</p><p>Alternately,·<a·href="#open/1"><code·class="inline">open/1,2</code></a>·can·be·used·to·establish·a·single·session·on
138 a·dedicated·connection.·(Or,·equivalently,·<a·href="#only_open/1"><code·class="inline">only_open/1,2</code></a>138 a·dedicated·connection.·(Or,·equivalently,·<a·href="#only_open/1"><code·class="inline">only_open/1,2</code></a>
139 followed·by·<a·href="#hello/1"><code·class="inline">hello/1-3</code></a>.)</p><p>Connect/session·options·can·be·specified·in·a·configuration·file·with·entries139 followed·by·<a·href="#hello/1"><code·class="inline">hello/1-3</code></a>.)</p><p>Connect/session·options·can·be·specified·in·a·configuration·file·with·entries
140 like·the·following.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8416273763-1">{</span><span·class="nf">server_id</span><span·class="p"·data-group-id="8416273763-2">(</span><span·class="p"·data-group-id="8416273763-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8416273763-3">[<[·...·truncated·by·diffoscope;·len:·236,·SHA:·be0e71fa9763b0aa0be15ea164a8a71a34bc7ce031324fd8054d51ca2f5bef21·...·]-1">}</span><span·class="p">.</span></code></pre><p>The·<a·href="#t:server_id/0"><code·class="inline">server_id/0</code></a>·or·an·associated·<a·href="ct.html#t:target_name/0"><code·class="inline">ct:target_name/0</code></a>·can·then·be·passed·to140 like·the·following.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0336484617-1">{</span><span·class="nf">server_id</span><span·class="p"·data-group-id="0336484617-2">(</span><span·class="p"·data-group-id="0336484617-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0336484617-3">[<[·...·truncated·by·diffoscope;·len:·236,·SHA:·5902339acce4c37a23771ff98157168f11eaddb0f5204e8ebf66680737f86d8a·...·]-1">}</span><span·class="p">.</span></code></pre><p>The·<a·href="#t:server_id/0"><code·class="inline">server_id/0</code></a>·or·an·associated·<a·href="ct.html#t:target_name/0"><code·class="inline">ct:target_name/0</code></a>·can·then·be·passed·to
141 the·aforementioned·functions·to·use·the·referenced·configuration.</p><p><a·href=""·id="Signaling"></a></p><p><em>Signaling</em></p><p>Protocol·operations·in·the·NETCONF·protocol·are·realized·as·remote·procedure141 the·aforementioned·functions·to·use·the·referenced·configuration.</p><p><a·href=""·id="Signaling"></a></p><p><em>Signaling</em></p><p>Protocol·operations·in·the·NETCONF·protocol·are·realized·as·remote·procedure
142 calls·(RPCs)·from·client·to·server·and·a·corresponding·reply·from·server·to142 calls·(RPCs)·from·client·to·server·and·a·corresponding·reply·from·server·to
143 client.·RPCs·are·sent·using·like-named·functions·(eg.143 client.·RPCs·are·sent·using·like-named·functions·(eg.
144 <a·href="#edit_config/3"><code·class="inline">edit_config/3-5</code></a>·to·send·an·edit-config·RPC),·with·the144 <a·href="#edit_config/3"><code·class="inline">edit_config/3-5</code></a>·to·send·an·edit-config·RPC),·with·the
145 server·reply·as·return·value.·There·are·functions·for·each·RPC·defined·in·RFC145 server·reply·as·return·value.·There·are·functions·for·each·RPC·defined·in·RFC
146 6241·and·the·create-subscription·RPC·from·RFC·5277,·all·of·which·are·wrappers·on146 6241·and·the·create-subscription·RPC·from·RFC·5277,·all·of·which·are·wrappers·on
147 <a·href="#send_rpc/2"><code·class="inline">send_rpc/2,3</code></a>,·that·can·be·used·to·send·an·arbitrary·RPC·not147 <a·href="#send_rpc/2"><code·class="inline">send_rpc/2,3</code></a>,·that·can·be·used·to·send·an·arbitrary·RPC·not
148 defined·in·RFC·6241·or·RFC·5277.</p><p>All·of·the·signaling·functions·have·one·variant·with·a·<code·class="inline">Timeout</code>·argument·and148 defined·in·RFC·6241·or·RFC·5277.</p><p>All·of·the·signaling·functions·have·one·variant·with·a·<code·class="inline">Timeout</code>·argument·and
149 one·without,·corresponding·to·an·infinite·timeout.·The·latter·is·inappropriate149 one·without,·corresponding·to·an·infinite·timeout.·The·latter·is·inappropriate
150 in·most·cases·since·a·non-response·by·the·server·or·a·missing·message-id·causes150 in·most·cases·since·a·non-response·by·the·server·or·a·missing·message-id·causes
151 the·call·to·hang·indefinitely.</p><p><a·href=""·id="Logging"></a></p><p><em>Logging</em></p><p>The·NETCONF·server·uses·<code·class="inline">error_logger</code>·for·logging·of·NETCONF·traffic.·A·special151 the·call·to·hang·indefinitely.</p><p><a·href=""·id="Logging"></a></p><p><em>Logging</em></p><p>The·NETCONF·server·uses·<code·class="inline">error_logger</code>·for·logging·of·NETCONF·traffic.·A·special
152 purpose·error·handler·is·implemented·in·<code·class="inline">ct_conn_log_h</code>.·To·use·this·error152 purpose·error·handler·is·implemented·in·<code·class="inline">ct_conn_log_h</code>.·To·use·this·error
153 handler,·add·the·<code·class="inline">cth_conn_log</code>·hook·in·the·test·suite,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="6777249772-1">(</span><span·class="p"·data-group-id="6777249772-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">153 handler,·add·the·<code·class="inline">cth_conn_log</code>·hook·in·the·test·suite,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="5715119002-1">(</span><span·class="p"·data-group-id="5715119002-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
154 ····</span><span·class="p"·data-group-id="6777249772-2">[</span><span·class="p"·data-group-id="6777249772-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6777249772-4">[</span><span·class="p"·data-group-id="6777249772-5">{</[·...·truncated·by·diffoscope;·len:·936,·SHA:·697928ec3e8c9720845419686b7ce704da72ce4beaed5a9226dabf0e591d2455·...·]2-2">]</span><span·class="p">.</span></code></pre><p><code·class="inline">conn_log_mod()</code>·is·the·name·of·the·<code·class="inline">Common·Test</code>·module·implementing·the154 ····</span><span·class="p"·data-group-id="5715119002-2">[</span><span·class="p"·data-group-id="5715119002-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5715119002-4">[</span><span·class="p"·data-group-id="5715119002-5">{</[·...·truncated·by·diffoscope;·len:·936,·SHA:·e5ee0790e9721b0946bbe5a36918797b470c61c6100c8f5a1161bb9c6cf586e2·...·]2-2">]</span><span·class="p">.</span></code></pre><p><code·class="inline">conn_log_mod()</code>·is·the·name·of·the·<code·class="inline">Common·Test</code>·module·implementing·the
155 connection·protocol,·for·example,·<code·class="inline">ct_netconfc</code>.</p><p>Hook·option·<code·class="inline">log_type</code>·specifies·the·type·of·logging:</p><ul><li><p><strong><code·class="inline">raw</code></strong>·-·The·sent·and·received·NETCONF·data·is·logged·to·a·separate·text155 connection·protocol,·for·example,·<code·class="inline">ct_netconfc</code>.</p><p>Hook·option·<code·class="inline">log_type</code>·specifies·the·type·of·logging:</p><ul><li><p><strong><code·class="inline">raw</code></strong>·-·The·sent·and·received·NETCONF·data·is·logged·to·a·separate·text
156 file·&quot;as·is&quot;·without·any·formatting.·A·link·to·the·file·is·added·to·the·test156 file·&quot;as·is&quot;·without·any·formatting.·A·link·to·the·file·is·added·to·the·test
157 case·HTML·log.</p></li><li><p><strong><code·class="inline">pretty</code></strong>·-·The·sent·and·received·NETCONF·data·is·logged·to·a·separate·text157 case·HTML·log.</p></li><li><p><strong><code·class="inline">pretty</code></strong>·-·The·sent·and·received·NETCONF·data·is·logged·to·a·separate·text
158 file·with·XML·data·nicely·indented.·A·link·to·the·file·is·added·to·the·test158 file·with·XML·data·nicely·indented.·A·link·to·the·file·is·added·to·the·test
159 case·HTML·log.</p></li><li><p><strong><code·class="inline">html·(default)</code></strong>·-·The·sent·and·received·NETCONF·traffic·is·pretty·printed159 case·HTML·log.</p></li><li><p><strong><code·class="inline">html·(default)</code></strong>·-·The·sent·and·received·NETCONF·traffic·is·pretty·printed
160 directly·in·the·test·case·HTML·log.</p></li><li><p><strong><code·class="inline">silent</code></strong>·-·NETCONF·traffic·is·not·logged.</p></li></ul><p>By·default,·all·NETCONF·traffic·is·logged·in·one·single·log·file.·However,160 directly·in·the·test·case·HTML·log.</p></li><li><p><strong><code·class="inline">silent</code></strong>·-·NETCONF·traffic·is·not·logged.</p></li></ul><p>By·default,·all·NETCONF·traffic·is·logged·in·one·single·log·file.·However,
161 different·connections·can·be·logged·in·separate·files.·To·do·this,·use·hook161 different·connections·can·be·logged·in·separate·files.·To·do·this,·use·hook
162 option·<code·class="inline">hosts</code>·and·list·the·names·of·the·servers/connections·to·be·used·in·the162 option·<code·class="inline">hosts</code>·and·list·the·names·of·the·servers/connections·to·be·used·in·the
163 suite.·The·connections·must·be·named·for·this·to·work,·that·is,·they·must·be163 suite.·The·connections·must·be·named·for·this·to·work,·that·is,·they·must·be
164 opened·with·<a·href="#open/2"><code·class="inline">open/2</code></a>.</p><p>Option·<code·class="inline">hosts</code>·has·no·effect·if·<code·class="inline">log_type</code>·is·set·to·<code·class="inline">html</code>·or·<code·class="inline">silent</code>.</p><p>The·hook·options·can·also·be·specified·in·a·configuration·file·with164 opened·with·<a·href="#open/2"><code·class="inline">open/2</code></a>.</p><p>Option·<code·class="inline">hosts</code>·has·no·effect·if·<code·class="inline">log_type</code>·is·set·to·<code·class="inline">html</code>·or·<code·class="inline">silent</code>.</p><p>The·hook·options·can·also·be·specified·in·a·configuration·file·with
165 configuration·variable·<code·class="inline">ct_conn_log</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8955925160-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="p"·data-group-id="8955925160-2">[</span><span·class="p"·data-group-id="8955925160-3">{</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">conn_log_mod</span><span·class="p"·data-group-id="8955925160-4">(</span><span·class="p"·data-group-id="8955925160-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">conn_log_options</span><span·class="p"·data-group-id="8955925160-5">(</span><span·class="p"·data-group-id="8955925160-5">)</span><span·class="p"·data-group-id="8955925160-3">}</span><span·class="p"·data-group-id="8955925160-2">]</span><span·class="p"·data-group-id="8955925160-1">}</span><span·class="p">.</span></code></pre><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8896235984-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="p"·data-group-id="8896235984-2">[</span><span·class="p"·data-group-id="8896235984-3">{</span><span·class="ss">ct_netconfc</span><span·class="p">,</span><span·class="p"·data-group-id="8896235984-4">[</span><span·class="p"·data-group-id="8896235984-5">{</span><span·class="ss">log_type</span><span·class="p">,</span><span·class="ss">pretty</span><span·class="p"·data-group-id="8896235984-5">}</span><span·class="p">,</span><span·class="w"> 
166 ····························</span><span·class="p"·data-group-id="8896235984-6">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="8896235984-7">[</span><span·class="nc">ct</span><span·class="p">:</span><span·class=[·...·truncated·by·diffoscope;·len:·627,·SHA:·749b3928b1dd59cfe6b8783b47e578881bd1b0d3c42a2caaef6d5ef9386712f7·...·]165 configuration·variable·<code·class="inline">ct_conn_log</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5247934449-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1338,·SHA:·f5edf946e02980fefbb632abdafb7d051f520e60475099980c963e137620a658·...·]
 166 ····························</span><span·class="p"·data-group-id="6823376868-6">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="6823376868-7">[</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">key_or_name</span><span·class="p"·data-group-id="6823376868-8">(</span><span·class="p"·data-group-id="6823376868-8">)</span><span·class="p"·data-group-id="6823376868-7">]</span><span·class="p"·data-group-id="6823376868-6">}</span><span·class="p"·data-group-id="6823376868-4">]</span><span·class="p"·data-group-id="6823376868-3">}</span><span·class="p"·data-group-id="6823376868-2">]</span><span·class="p"·data-group-id="6823376868-1">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Hook·options·specified·in·a·configuration·file·overwrite·the·hard-coded·hook
167 options·in·the·test·suite.</p></section><p><em>Logging·Example·1:</em></p><p><a·href=""·id="Logging_example_1"></a></p><p>The·following·<code·class="inline">ct_hooks</code>·statement·causes·pretty·printing·of·NETCONF·traffic·to167 options·in·the·test·suite.</p></section><p><em>Logging·Example·1:</em></p><p><a·href=""·id="Logging_example_1"></a></p><p>The·following·<code·class="inline">ct_hooks</code>·statement·causes·pretty·printing·of·NETCONF·traffic·to
168 separate·logs·for·the·connections·named·<code·class="inline">nc_server1</code>·and·<code·class="inline">nc_server2</code>.·Any·other168 separate·logs·for·the·connections·named·<code·class="inline">nc_server1</code>·and·<code·class="inline">nc_server2</code>.·Any·other
169 connections·are·logged·to·default·NETCONF·log.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="9384308079-1">(</span><span·class="p"·data-group-id="9384308079-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 connections·are·logged·to·default·NETCONF·log.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="6871724761-1">(</span><span·class="p"·data-group-id="6871724761-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 ···</span><span·class="p"·data-group-id="9384308079-2">[</span><span·class="p"·data-group-id="9384308079-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9384308079-4">[</span><span·class="p"·data-group-id="9384308079-5">{</span><span·class="ss">cth_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9384308079-6">[</span><span·class="p"·data-group-id="9384308079-7">{</span><span·class="ss">ct_netconfc</span><span·class="p">,</span><span·class="p"·data-group-id="9384308079-8">[</span><span·class="p"·data-group-id="9384308079-9">{</span><span·class="ss">log_type</span><span·class="p">,</span><span·class="ss">pretty</span><span·class="p"·data-group-id="9384308079-9">}</span><span·class="p">}</span><span·class="p">,</span><span·class="w"> 
171 ··············································</span><span·class="p"·data-group-id="9384308079-10">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="9384308079-11">[</span><span·class="ss">nc_server1</span><span·class="p">,</span><span·class="ss">nc_server2</span><span·class="p"·data-group-id="9384308079-11">]</span><span·class="p"·data-group-id="9384308079-10">}</span><span·class="p"·data-group-id="9384308079-8">]</span><span·class="p"·data-group-id="9384308079-7">}</span><span·class="w"> 
172 ·······························</span><span·class="p"·data-group-id="9384308079-6">]</span><span·class="p"·data-group-id="9384308079-5">}</span><span·class="p"·data-group-id="9384308079-4">]</span><span·class="p"·data-group-id="9384308079-3">}</span><span·class="p"·data-group-id="9384308079-2">]</span><span·class="p">.</span></code></pre><p>Connections·must·be·opened·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">open</span><span·class="p"·data-group-id="5946032229-1">(</span><span·class="ss">nc_server1</span><span·class="p">,</span><span·class="p"·data-group-id="5946032229-2">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5946032229-2">]</span><span·class="p"·data-group-id="5946032229-1">)</span><span·class="p">,</span><span·class="w"> 
173 </span><span·class="nf">open</span><span·class="p"·data-group-id="5946032229-3">(</span><span·class="ss">nc_server2</span><span·class="p">,</span><span·class="p"·data-group-id="5946032229-4">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5946032229-4">]</span><span·class="p"·data-group-id="5946032229-3">)</span><span·class="p">.</span></code></pre><p><em>Logging·Example·2:</em></p><p><a·href=""·id="Logging_example_2"></a></p><p>The·following·configuration·file·causes·raw·logging·of·all·NETCONF·traffic·in·to 
174 one·single·text·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8423046824-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="p"·data-group-id="8423046824-2">[</span><span·class="p"·data-group-id="8423046824-3">{</span><span·class="ss">ct_netconfc</span><span·class="p">,</span><span·class="p"·data-group-id="8423046824-4">[</span><span·class="p"·data-group-id="8423046824-5">{</span><span·class="ss">log_type</span><span·class="p">,</span><span·class="ss">raw</span><span·class="p"·data-group-id="8423046824-5">}</span><span·class="p"·data-group-id="8423046824-4">]</span><span·class="p"·data-group-id="8423046824-3">}</span><span·class="p"·data-group-id="8423046824-2">]</span><span·class="p"·data-group-id="8423046824-1">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">ct_hooks</code>·statement·must·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="7120980675-1">(</span><span·class="p"·data-group-id="7120980675-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
175 ····</span><span·class="p"·data-group-id="7120980675-2">[</span><span·class="p"·data-group-id="7120980675-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7120980675-4">[</span><span·cla[·...·truncated·by·diffoscope;·len:·589,·SHA:·0987789851382db6763932c0ce88916259b09ea6b1a53dc725d769d949f990f3·...·]170 ···</span><span·class="p"·data-group-id="6871724761-2">[</span><span·class="p"·data-group-id="6871724761-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6871724761-4">[</span><span·clas[·...·truncated·by·diffoscope;·len:·601,·SHA:·677f6567114f66757ec46d8b06490c0606e69e31decaf356ee724f03ba6c6f51·...·]
 171 ··············································</span><span·class="p"·data-group-id="6871724761-10">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="6871724761-11">[</span><span·class="ss">nc_server1</span><span·class="p">,</span><span·class="ss">nc_server2</span><span·class="p"·data-group-id="6871724761-11">]</span><span·class="p"·data-group-id="6871724761-10">}</span><span·class="p"·data-group-id="6871724761-8">]</span><span·class="p"·data-group-id="6871724761-7">}</span><span·class="w">
 172 ·······························</span><span·class="p"·data-group-id="6871724761-6">]</span><span·class="p"·data-group-id="6871724761-5">}</span><span·class="p"·data-group-id="6871724761-4">]</span><span·class="p"·data-group-id="6871724761-3">}</span><span·class="p"·data-group-id="6871724761-2">]</span><span·class="p">.</span></code></pre><p>Connections·must·be·opened·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">open</span><span·class="p"·data-group-id="5223278011-1">(</span><span·class="ss">nc_server1</span><span·class="p">,</span><span·class="p"·data-group-id="5223278011-2">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5223278011-2">]</span><span·class="p"·data-group-id="5223278011-1">)</span><span·class="p">,</span><span·class="w">
 173 </span><span·class="nf">open</span><span·class="p"·data-group-id="5223278011-3">(</span><span·class="ss">nc_server2</span><span·class="p">,</span><span·class="p"·data-group-id="5223278011-4">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5223278011-4">]</span><span·class="p"·data-group-id="5223278011-3">)</span><span·class="p">.</span></code></pre><p><em>Logging·Example·2:</em></p><p><a·href=""·id="Logging_example_2"></a></p><p>The·following·configuration·file·causes·raw·logging·of·all·NETCONF·traffic·in·to
 174 one·single·text·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0996684861-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="p"·data-group-id="0996684861-2">[</span><span·class="p"·data-group-id="0996684861-3">{</span><span·class="ss">ct_netconfc</span><span·class="p">,</span><span·class="p"·data-group-id="0996684861-4">[</span><span·class="p"·data-group-id="0996684861-5">{</span><span·class="ss">log_type</span><span·class="p">,</span><span·class="ss">raw</span><span·class="p"·data-group-id="0996684861-5">}</span><span·class="p"·data-group-id="0996684861-4">]</span><span·class="p"·data-group-id="0996684861-3">}</span><span·class="p"·data-group-id="0996684861-2">]</span><span·class="p"·data-group-id="0996684861-1">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">ct_hooks</code>·statement·must·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="2963248330-1">(</span><span·class="p"·data-group-id="2963248330-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
 175 ····</span><span·class="p"·data-group-id="2963248330-2">[</span><span·class="p"·data-group-id="2963248330-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2963248330-4">[</span><span·class="p"·data-group-id="2963248330-5">{</span><span·class="ss">cth_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2963248330-6">[</span><span·class="p"·data-group-id="2963248330-6">]</span><span·class="p"·data-group-id="2963248330-5">}</span><span·class="p"·data-group-id="2963248330-4">]</span><span·class="p"·data-group-id="2963248330-3">}</span><span·class="p"·data-group-id="2963248330-2">]</span><span·class="p">.</span></code></pre><p>The·same·<code·class="inline">ct_hooks</code>·statement·without·the·configuration·file·would·cause·HTML
176 logging·of·all·NETCONF·connections·in·to·the·test·case·HTML·log.</p>176 logging·of·all·NETCONF·connections·in·to·the·test·case·HTML·log.</p>
177 ····</section>177 ····</section>
  
178 </div>178 </div>
  
179 ··<section·id="summary"·class="details-list">179 ··<section·id="summary"·class="details-list">
180 ····<h1·class="section-heading">180 ····<h1·class="section-heading">
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2097 ·························Result·::·ok·|·{error,·<a·href="#t:error_reason/0">error_reason</a>()}.</pre>2097 ·························Result·::·ok·|·{error,·<a·href="#t:error_reason/0">error_reason</a>()}.</pre>
  
2098 ······</div>2098 ······</div>
  
2099 <p>Edits·configuration·data.</p><p>By·default·only·the·running·target·is·available,·unless·the·server·includes2099 <p>Edits·configuration·data.</p><p>By·default·only·the·running·target·is·available,·unless·the·server·includes
2100 <code·class="inline">:candidate</code>·or·<code·class="inline">:startup</code>·in·its·list·of·capabilities.</p><p><code·class="inline">OptParams</code>·can·be·used·for·specifying·optional·parameters·(<code·class="inline">default-operation</code>,2100 <code·class="inline">:candidate</code>·or·<code·class="inline">:startup</code>·in·its·list·of·capabilities.</p><p><code·class="inline">OptParams</code>·can·be·used·for·specifying·optional·parameters·(<code·class="inline">default-operation</code>,
2101 <code·class="inline">test-option</code>,·or·<code·class="inline">error-option</code>)·to·be·added·to·the·<code·class="inline">edit-config</code>·request.·The2101 <code·class="inline">test-option</code>,·or·<code·class="inline">error-option</code>)·to·be·added·to·the·<code·class="inline">edit-config</code>·request.·The
2102 value·must·be·a·list·containing·valid·simple·XML,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7265219961-1">[</span><span·class="p"·data-group-id="7265219961-2">{</span><span·class="ss">&#39;default-operation&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7265219961-3">[</span><span·class="s">&quot;none&qu[·...·truncated·by·diffoscope;·len:·104,·SHA:·e25e7b6cb7b178047b56e090069fd0a5f899f8dca7f9d20eb47283c0477f9828·...·]-2">}</span><span·class="p">,</span><span·class="w">2102 value·must·be·a·list·containing·valid·simple·XML,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2875178015-1">[</span><span·class="p"·data-group-id="2875178015-2">{</span><span·class="ss">&#39;default-operation&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2875178015-3">[</span><span·class="s">&quot;none&qu[·...·truncated·by·diffoscope;·len:·104,·SHA:·52c24ee817abe3689ba2484c106e6a50fad595fdababe6709e521e2159a65ecd·...·]-2">}</span><span·class="p">,</span><span·class="w">
2103 ·</span><span·class="p"·data-group-id="7265219961-4">{</span><span·class="ss">&#39;error-option&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7265219961-5">[</span><span·class="s">&quot;rollback-on-error&quot;</span><span·class="p"·data-group-id="7265[·...·truncated·by·diffoscope;·len:·112,·SHA:·4a8f7c1fc1f672ae0b8389bd963b803e730669d824956e68b82abc47c0118491·...·]-1">]</span></code></pre><p>If·<code·class="inline">OptParams</code>·is·not·given,·the·default·value·<code·class="inline">[]</code>·is·used.</p>2103 ·</span><span·class="p"·data-group-id="2875178015-4">{</span><span·class="ss">&#39;error-option&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2875178015-5">[</span><span·class="s">&quot;rollback-on-error&quot;</span><span·class="p"·data-group-id="2875[·...·truncated·by·diffoscope;·len:·112,·SHA:·3ac25e176ef8dfb5796c482ec26f2b8686ab66ce0bcd3df1156f00689e65129e·...·]-1">]</span></code></pre><p>If·<code·class="inline">OptParams</code>·is·not·given,·the·default·value·<code·class="inline">[]</code>·is·used.</p>
2104 ··</section>2104 ··</section>
2105 </section>2105 </section>
2106 <section·class="detail"·id="get/2">2106 <section·class="detail"·id="get/2">
  
2107 ··<div·class="detail-header">2107 ··<div·class="detail-header">
2108 ····<a·href="#get/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2108 ····<a·href="#get/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
2109 ······<i·class="ri-link-m"·aria-hidden="true"></i>2109 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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3158 ······<p·class="built-using">3158 ······<p·class="built-using">
3159 ········Built·using3159 ········Built·using
3160 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3160 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3161 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3161 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3162 ······</p>3162 ······</p>
3163 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3163 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3164 ····</footer>3164 ····</footer>
3165 ··</div>3165 ··</div>
3166 </main>3166 </main>
3167 </div>3167 </div>
3168 <script>3168 <script>
3169 ··function·mermaidLoaded()·{3169 ··function·mermaidLoaded()·{
3170 ····mermaid.initialize({3170 ····mermaid.initialize({
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131 <p>Support·in·Common·Test·for·running·property-based·tests.</p><p>This·module·helps·running·property-based·tests·in·the·<code·class="inline">Common·Test</code>·framework.131 <p>Support·in·Common·Test·for·running·property-based·tests.</p><p>This·module·helps·running·property-based·tests·in·the·<code·class="inline">Common·Test</code>·framework.
132 One·(or·more)·of·the·property·testing·tools</p><ul><li><a·href="http://www.quviq.com">QuickCheck</a>,</li><li><a·href="https://proper-testing.github.io">PropEr</a>·or</li><li><a·href="https://github.com/krestenkrab/triq">Triq</a></li></ul><p>is·assumed·to·be·installed.</p><p>The·idea·with·this·module·is·to·have·a·<code·class="inline">Common·Test</code>·test·suite·calling·a132 One·(or·more)·of·the·property·testing·tools</p><ul><li><a·href="http://www.quviq.com">QuickCheck</a>,</li><li><a·href="https://proper-testing.github.io">PropEr</a>·or</li><li><a·href="https://github.com/krestenkrab/triq">Triq</a></li></ul><p>is·assumed·to·be·installed.</p><p>The·idea·with·this·module·is·to·have·a·<code·class="inline">Common·Test</code>·test·suite·calling·a
133 property·testing·tool·with·special·property·test·suites·as·defined·by·that·tool.133 property·testing·tool·with·special·property·test·suites·as·defined·by·that·tool.
134 The·tests·are·collected·in·the·<code·class="inline">test</code>·directory·of·the·application.·The·<code·class="inline">test</code>134 The·tests·are·collected·in·the·<code·class="inline">test</code>·directory·of·the·application.·The·<code·class="inline">test</code>
135 directory·has·a·subdirectory·<code·class="inline">property_test</code>,·where·everything·needed·for·the135 directory·has·a·subdirectory·<code·class="inline">property_test</code>,·where·everything·needed·for·the
136 property·tests·are·collected.·The·usual·Erlang·application·directory·structure136 property·tests·are·collected.·The·usual·Erlang·application·directory·structure
137 is·assumed.</p><p>A·typical·<code·class="inline">Common·Test</code>·test·suite·using·<code·class="inline">ct_property_test</code>·is·organized·as137 is·assumed.</p><p>A·typical·<code·class="inline">Common·Test</code>·test·suite·using·<code·class="inline">ct_property_test</code>·is·organized·as
138 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1432238480-1">(</span><span·class="ss">my_prop_test_SUITE</span><span·class="p"·data-group-id="1432238480-1">)</span><span·class="p">.</span><span·class="w">138 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7902864168-1">(</span><span·class="ss">my_prop_test_SUITE</span><span·class="p"·data-group-id="7902864168-1">)</span><span·class="p">.</span><span·class="w">
139 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="1432238480-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="1432238480-2">)</span><span·class="p">.</span><span·class="w">139 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="7902864168-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="7902864168-2">)</span><span·class="p">.</span><span·class="w">
140 </span><span·class="w">140 </span><span·class="w">
141 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="1432238480-3">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="1432238480-3">)</span><span·class="p">.</span><span·class="w">141 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7902864168-3">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="7902864168-3">)</span><span·class="p">.</span><span·class="w">
  
142 </span><span·class="nf">all</span><span·class="p"·data-group-id="1432238480-4">(</span><span·class="p"·data-group-id="1432238480-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1432238480-5">[</span><span·class="ss">prop_ftp_case</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·501eb2ec8af1aed053e82aff03dc7dee58fb453a5656ba29096474201773b86f·...·]-5">]</span><span·class="p">.</span><span·class="w">142 </span><span·class="nf">all</span><span·class="p"·data-group-id="7902864168-4">(</span><span·class="p"·data-group-id="7902864168-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7902864168-5">[</span><span·class="ss">prop_ftp_case</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·a0e441b812d7ddc6ae1f50c320f139320f8df8b6f59d149042150aead3018074·...·]-5">]</span><span·class="p">.</span><span·class="w">
  
143 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="1432238480-6">(</span><span·class="n">Config</span><span·class="p"·data-group-id="1432238480-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">143 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7902864168-6">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7902864168-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
144 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="1432238480-7">(</span><span·class="n">Config</span><span·class="p"·data-group-id="1432238480-7">)</span><span·class="p">.</span><span·class="w">144 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7902864168-7">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7902864168-7">)</span><span·class="p">.</span><span·class="w">
  
145 </span><span·class="c1">%%%----·test·case</span><span·class="w">145 </span><span·class="c1">%%%----·test·case</span><span·class="w">
146 </span><span·class="nf">prop_ftp_case</span><span·class="p"·data-group-id="1432238480-8">(</span><span·class="n">Config</span><span·class="p"·data-group-id="1432238480-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">146 </span><span·class="nf">prop_ftp_case</span><span·class="p"·data-group-id="7902864168-8">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7902864168-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
147 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">quickcheck</span><span·class="p"·data-group-id="1432238480-9">(</span><span·class="w">147 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">quickcheck</span><span·class="p"·data-group-id="7902864168-9">(</span><span·class="w">
148 ······</span><span·class="nc">ftp_simple_client_server</span><span·class="p">:</span><span·class="nf">prop_ftp</span><span·class="p"·data-group-id="1432238480-10">(</span><span·class="p"·data-group-id="1432238480-10">)</span><span·class="p">,</span><span·class="w">148 ······</span><span·class="nc">ftp_simple_client_server</span><span·class="p">:</span><span·class="nf">prop_ftp</span><span·class="p"·data-group-id="7902864168-10">(</span><span·class="p"·data-group-id="7902864168-10">)</span><span·class="p">,</span><span·class="w">
149 ······</span><span·class="n">Config</span><span·class="w">149 ······</span><span·class="n">Config</span><span·class="w">
150 ·····</span><span·class="p"·data-group-id="1432238480-9">)</span><span·class="p">.</span></code></pre><p>and·the·the·property·test·module·(in·this·example150 ·····</span><span·class="p"·data-group-id="7902864168-9">)</span><span·class="p">.</span></code></pre><p>and·the·the·property·test·module·(in·this·example
151 <code·class="inline">ftp_simple_client_server.erl</code>)·as·almost·a·usual·property·testing·module·(More151 <code·class="inline">ftp_simple_client_server.erl</code>)·as·almost·a·usual·property·testing·module·(More
152 examples·are·in·<a·href="ct_property_test_chapter.html">the·User's·Guide</a>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2650119932-1">(</span><span·class="ss">ftp_simple_client_server</span><span·class="p"·data-group-id="2650119932-1">)</span><span·class="p">.</span><span·class="w">152 examples·are·in·<a·href="ct_property_test_chapter.html">the·User's·Guide</a>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0305153262-1">(</span><span·class="ss">ftp_simple_client_server</span><span·class="p"·data-group-id="0305153262-1">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2650119932-2">(</span><span·class="p"·data-group-id="2650119932-3">[</span><span·class="ss">prop_ftp</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·65,·SHA:·adfaa20a215108b975d395cb944d63aa353b645e003c9256c84e1cc71b2f2027·...·]2-2">)</span><span·class="p">.</span><span·class="w">153 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0305153262-2">(</span><span·class="p"·data-group-id="0305153262-3">[</span><span·class="ss">prop_ftp</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·65,·SHA:·d978f742c488a4113d709a73e7eb536369a18e5202e6e218a7d9dc502e6f7fd6·...·]2-2">)</span><span·class="p">.</span><span·class="w">
154 </span><span·class="w">154 </span><span·class="w">
155 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2650119932-4">(</span><span·class="s">&quot;common_test/include/ct_property_test.hrl&quot;</span><span·class="p"·data-group-id="2650119932-4">)</span><span·class="p">.</span><span·class="w">155 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="0305153262-4">(</span><span·class="s">&quot;common_test/include/ct_property_test.hrl&quot;</span><span·class="p"·data-group-id="0305153262-4">)</span><span·class="p">.</span><span·class="w">
  
156 </span><span·class="nf">prop_ftp</span><span·class="p"·data-group-id="2650119932-5">(</span><span·class="p"·data-group-id="2650119932-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 </span><span·class="nf">prop_ftp</span><span·class="p"·data-group-id="0305153262-5">(</span><span·class="p"·data-group-id="0305153262-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ····</span><span·class="o">?</span><span·class="n">FORALL</span><span·class="p"·data-group-id="2650119932-6">(</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>157 ····</span><span·class="o">?</span><span·class="n">FORALL</span><span·class="p"·data-group-id="0305153262-6">(</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>
158 ····</section>158 ····</section>
  
159 </div>159 </div>
  
160 ··<section·id="summary"·class="details-list">160 ··<section·id="summary"·class="details-list">
161 ····<h1·class="section-heading">161 ····<h1·class="section-heading">
162 ······<a·class="hover-link"·href="#summary">162 ······<a·class="hover-link"·href="#summary">
Offset 842, 15 lines modifiedOffset 842, 15 lines modified
842 <code·class="inline">{fail,·Explanation}</code>.</p><p>If·support·is·found,·the·option·<code·class="inline">{property_test_tool,ToolModule}</code>·with·the842 <code·class="inline">{fail,·Explanation}</code>.</p><p>If·support·is·found,·the·option·<code·class="inline">{property_test_tool,ToolModule}</code>·with·the
843 selected·tool·main·module·name·(<code·class="inline">eqc</code>,·<code·class="inline">proper</code>·or·<code·class="inline">triq</code>)·is·added·to·the·list843 selected·tool·main·module·name·(<code·class="inline">eqc</code>,·<code·class="inline">proper</code>·or·<code·class="inline">triq</code>)·is·added·to·the·list
844 <code·class="inline">Config</code>·which·then·is·returned.</p><p>The·property·tests·are·assumed·to·be·in·a·subdirectory·named·<code·class="inline">property_test</code>.844 <code·class="inline">Config</code>·which·then·is·returned.</p><p>The·property·tests·are·assumed·to·be·in·a·subdirectory·named·<code·class="inline">property_test</code>.
845 All·found·Erlang·files·in·that·directory·are·compiled·with·one·of·the·macros845 All·found·Erlang·files·in·that·directory·are·compiled·with·one·of·the·macros
846 <code·class="inline">'EQC'</code>,·<code·class="inline">'PROPER'</code>·or·<code·class="inline">'TRIQ'</code>·set,·depending·on·which·tool·that·is·first846 <code·class="inline">'EQC'</code>,·<code·class="inline">'PROPER'</code>·or·<code·class="inline">'TRIQ'</code>·set,·depending·on·which·tool·that·is·first
847 found.·This·could·make·parts·of·the·Erlang·property·tests·code·to·be·included·or847 found.·This·could·make·parts·of·the·Erlang·property·tests·code·to·be·included·or
848 excluded·with·the·macro·directives·<code·class="inline">-ifdef(Macro).</code>·or·<code·class="inline">-ifndef(Macro).</code>.</p><p>The·file(s)·in·the·<code·class="inline">property_test</code>·subdirectory·could,·or·should,·include·the848 excluded·with·the·macro·directives·<code·class="inline">-ifdef(Macro).</code>·or·<code·class="inline">-ifndef(Macro).</code>.</p><p>The·file(s)·in·the·<code·class="inline">property_test</code>·subdirectory·could,·or·should,·include·the
849 ct_property_test·include·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3199528290-1">(</span><span·class="s">&quot;common_test/include/ct_property_test.hrl&quot;</span><span·class="p"·data-group-id="3199528290-1">)</span><span·class="p">.</span></code></pre><p>This·included·file·will:</p><ul><li>Include·the·correct·tool's·include·file</li><li>Set·the·macro·<code·class="inline">'MOD_eqc'</code>·to·the·correct·module·name·for·the·selected·tool.849 ct_property_test·include·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8897557677-1">(</span><span·class="s">&quot;common_test/include/ct_property_test.hrl&quot;</span><span·class="p"·data-group-id="8897557677-1">)</span><span·class="p">.</span></code></pre><p>This·included·file·will:</p><ul><li>Include·the·correct·tool's·include·file</li><li>Set·the·macro·<code·class="inline">'MOD_eqc'</code>·to·the·correct·module·name·for·the·selected·tool.
850 That·is,·the·macro·<code·class="inline">'MOD_eqc'</code>·is·set·to·either·<code·class="inline">eqc</code>,·<code·class="inline">proper</code>·or·<code·class="inline">triq</code>.</li></ul>850 That·is,·the·macro·<code·class="inline">'MOD_eqc'</code>·is·set·to·either·<code·class="inline">eqc</code>,·<code·class="inline">proper</code>·or·<code·class="inline">triq</code>.</li></ul>
851 ··</section>851 ··</section>
852 </section>852 </section>
853 <section·class="detail"·id="num_calls/1">853 <section·class="detail"·id="num_calls/1">
  
854 ··<div·class="detail-header">854 ··<div·class="detail-header">
855 ····<a·href="#num_calls/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">855 ····<a·href="#num_calls/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 947, 34 lines modifiedOffset 947, 34 lines modified
947 ····························Config·::·<a·href="../../../../lib/stdlib-6.2.2/doc/html/proplists.html#t:proplist/0">proplists:proplist</a>(),947 ····························Config·::·<a·href="../../../../lib/stdlib-6.2.2/doc/html/proplists.html#t:proplist/0">proplists:proplist</a>(),
948 ····························Options0·::·<a·href="../../../../lib/stdlib-6.2.2/doc/html/proplists.html#t:proplist/0">proplists:proplist</a>().</pre>948 ····························Options0·::·<a·href="../../../../lib/stdlib-6.2.2/doc/html/proplists.html#t:proplist/0">proplists:proplist</a>().</pre>
  
949 ······</div>949 ······</div>
  
950 <p>Presents·the·result·of·<em>stateful·(statem)·property·testing</em>·using·the·aggregate950 <p>Presents·the·result·of·<em>stateful·(statem)·property·testing</em>·using·the·aggregate
951 function·in·PropEr,·QuickCheck·or·other·similar·property·testing·tool.</p><p>It·is·assumed·to·be·called·inside·the·property·called·by·<a·href="#quickcheck/2"><code·class="inline">quickcheck/2</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">951 function·in·PropEr,·QuickCheck·or·other·similar·property·testing·tool.</p><p>It·is·assumed·to·be·called·inside·the·property·called·by·<a·href="#quickcheck/2"><code·class="inline">quickcheck/2</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
952 </span><span·class="n">RunResult</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">run_parallel_commands</span><span·class="p"·data-group-id="3405963623-1">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p"·data-group-id="3405963623-1">)</span><span·class="p">,</span><span·class="w">952 </span><span·class="n">RunResult</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">run_parallel_commands</span><span·class="p"·data-group-id="5528773087-1">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p"·data-group-id="5528773087-1">)</span><span·class="p">,</span><span·class="w">
953 </span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">present_result</span><span·class="p"·data-group-id="3405963623-2">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RunResult</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·92,·SHA:·ed85d6697243d32b36c048b48c7c5f158933046b843151f9a21677d0cc23c548·...·]-2">)</span><span·class="w">953 </span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">present_result</span><span·class="p"·data-group-id="5528773087-2">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RunResult</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·92,·SHA:·e31ddba0c7a32f1cdba44f6f50ea665d932007e1afced5b4a0da9e60590ac928·...·]-2">)</span><span·class="w">
954 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>See·the·<a·href="ct_property_test_chapter.html#stateful1">User's·Guide</a>·for·an·example·of954 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>See·the·<a·href="ct_property_test_chapter.html#stateful1">User's·Guide</a>·for·an·example·of
955 the·usage·and·of·the·default·printout.</p><p>The·<code·class="inline">StatisticsSpec</code>·is·a·list·of·the·tuples:</p><ul><li><code·class="inline">{Title::string(),·CollectFun::fun/1}</code></li><li><code·class="inline">{Title::string(),·FrequencyFun::/0,·CollectFun::fun/1}</code></li></ul><p>Each·tuple·will·produce·one·table·in·the·order·of·their·places·in·the·list.</p><ul><li><p><code·class="inline">Title</code>·will·be·the·title·of·one·result·table</p></li><li><p><code·class="inline">CollectFun</code>·is·called·with·one·argument:·the·<code·class="inline">Cmds</code>.·It·should·return·a·list955 the·usage·and·of·the·default·printout.</p><p>The·<code·class="inline">StatisticsSpec</code>·is·a·list·of·the·tuples:</p><ul><li><code·class="inline">{Title::string(),·CollectFun::fun/1}</code></li><li><code·class="inline">{Title::string(),·FrequencyFun::/0,·CollectFun::fun/1}</code></li></ul><p>Each·tuple·will·produce·one·table·in·the·order·of·their·places·in·the·list.</p><ul><li><p><code·class="inline">Title</code>·will·be·the·title·of·one·result·table</p></li><li><p><code·class="inline">CollectFun</code>·is·called·with·one·argument:·the·<code·class="inline">Cmds</code>.·It·should·return·a·list
956 of·the·values·to·be·counted.·The·following·pre-defined·functions·exist:</p><ul><li><a·href="#cmnd_names/1"><code·class="inline">ct_property_test:cmnd_names/1</code></a>·returns·a·list·of·commands·(function·calls)956 of·the·values·to·be·counted.·The·following·pre-defined·functions·exist:</p><ul><li><a·href="#cmnd_names/1"><code·class="inline">ct_property_test:cmnd_names/1</code></a>·returns·a·list·of·commands·(function·calls)
957 generated·in·the·<code·class="inline">Cmnd</code>·sequence,·without·Module,·Arguments·and·other957 generated·in·the·<code·class="inline">Cmnd</code>·sequence,·without·Module,·Arguments·and·other
958 details.</li><li><a·href="#num_calls/1"><code·class="inline">ct_property_test:num_calls/1</code></a>·returns·a·list·of·the·length·of·commands958 details.</li><li><a·href="#num_calls/1"><code·class="inline">ct_property_test:num_calls/1</code></a>·returns·a·list·of·the·length·of·commands
959 lists</li><li><a·href="#sequential_parallel/1"><code·class="inline">ct_property_test:sequential_parallel/1</code></a>·returns·a·list·with·information959 lists</li><li><a·href="#sequential_parallel/1"><code·class="inline">ct_property_test:sequential_parallel/1</code></a>·returns·a·list·with·information
960 about·sequential·and·parallel·parts·from·<code·class="inline">Tool:parallel_commands/1,2</code></li></ul></li><li><p><code·class="inline">FrequencyFun/0</code>·returns·a·fun/1·which·is·supposed·to·take·a·list·of·items·as960 about·sequential·and·parallel·parts·from·<code·class="inline">Tool:parallel_commands/1,2</code></li></ul></li><li><p><code·class="inline">FrequencyFun/0</code>·returns·a·fun/1·which·is·supposed·to·take·a·list·of·items·as
961 input,·and·return·an·iolist·which·will·be·printed·as·the·table.·Per·default,961 input,·and·return·an·iolist·which·will·be·printed·as·the·table.·Per·default,
962 the·number·of·each·item·is·counted·and·the·percentage·is·printed·for·each.·The962 the·number·of·each·item·is·counted·and·the·percentage·is·printed·for·each.·The
963 list·[a,b,a,a,c]·could·for·example·return</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2728329001-1">[</span><span·class="s">&quot;a·60%\n&quot;</span><span·class="p">,</span><span·class="s">&quot;b·20%\n&quot;</span><span·class="p">,</span><span·class="s">&quot;c·20%\n&quot;</span><span·class="p"·data-group-id="2728329001-1">]</span></code></pre><p>which·will·be·printed·by·the·<code·class="inline">print_fun</code>.·The·default·<code·class="inline">print_fun</code>·will·print963 list·[a,b,a,a,c]·could·for·example·return</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7630217480-1">[</span><span·class="s">&quot;a·60%\n&quot;</span><span·class="p">,</span><span·class="s">&quot;b·20%\n&quot;</span><span·class="p">,</span><span·class="s">&quot;c·20%\n&quot;</span><span·class="p"·data-group-id="7630217480-1">]</span></code></pre><p>which·will·be·printed·by·the·<code·class="inline">print_fun</code>.·The·default·<code·class="inline">print_fun</code>·will·print
964 it·as:</p><pre><code·class="text">a·60%964 it·as:</p><pre><code·class="text">a·60%
965 b·20%965 b·20%
966 c·20%</code></pre></li></ul><p>The·default·<code·class="inline">StatisticsSpec</code>·is:</p><ul><li><p>For·sequential·commands:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6953976556-1">[</span><span·class="p"·data-group-id="6953976556-2">{</span><span·class="s">&quot;Function·calls&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">cmnd_names</span>[·...·truncated·by·diffoscope;·len:·90,·SHA:·3d056aa0e6e3f5ccf76b638435743891bf3ded4185f48800c7c69a8d552dfb64·...·]-2">}</span><span·class="p">,</span><span·class="w">966 c·20%</code></pre></li></ul><p>The·default·<code·class="inline">StatisticsSpec</code>·is:</p><ul><li><p>For·sequential·commands:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2684582893-1">[</span><span·class="p"·data-group-id="2684582893-2">{</span><span·class="s">&quot;Function·calls&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">cmnd_names</span>[·...·truncated·by·diffoscope;·len:·90,·SHA:·2f379d996bca61c80c546138536c548081274225b11847365d4738b9c72bd009·...·]-2">}</span><span·class="p">,</span><span·class="w">
967 ·</span><span·class="p"·data-group-id="6953976556-3">{</span><span·class="s">&quot;Length·of·command·sequences&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">print_frequency_ranges</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">967 ·</span><span·class="p"·data-group-id="2684582893-3">{</span><span·class="s">&quot;Length·of·command·sequences&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">print_frequency_ranges</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
968 ··················································</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">num_calls</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6953976556-3">}</span><span·class="p"·data-group-id="6953976556-1">]</span></code></pre></li><li><p>For·parallel·commands:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3748007513-1">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·322,·SHA:·c5ad71f3c9bc45ef8a168fa3988dc14d5b2f3b14587a5fdc6054524b2ce86d6d·...·]-2">}</span><span·class="p">,</span><span·class="w">968 ··················································</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">num_calls</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="2684582893-3">}</span><span·class="p"·data-group-id="2684582893-1">]</span></code></pre></li><li><p>For·parallel·commands:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7906624091-1">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·322,·SHA:·bcb858215d83c41a1df96e3b3696fce13cf4a3de9576fc2b841869019ce545f8·...·]-2">}</span><span·class="p">,</span><span·class="w">
969 ·</span><span·class="p"·data-group-id="3748007513-3">{</span><span·class="s">&quot;Function·calls&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">cmnd_names</span><span·class="p">/</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·cbca864235b6782cad598358b1ce60629f3d995d4fc646283a3e6df81172d506·...·]-3">}</span><span·class="p">,</span><span·class="w">969 ·</span><span·class="p"·data-group-id="7906624091-3">{</span><span·class="s">&quot;Function·calls&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">cmnd_names</span><span·class="p">/</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·04267f288e81099ce3677d02fbb09130b9d76f979758ec6e89b1590e15018f05·...·]-3">}</span><span·class="p">,</span><span·class="w">
970 ·</span><span·class="p"·data-group-id="3748007513-4">{</span><span·class="s">&quot;Length·of·command·sequences&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">print_frequency_ranges</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">970 ·</span><span·class="p"·data-group-id="7906624091-4">{</span><span·class="s">&quot;Length·of·command·sequences&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">print_frequency_ranges</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
971 ··················································</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">num_calls</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3748007513-4">}</span><span·class="p"·data-group-id="3748007513-1">]</span></code></pre></li></ul>971 ··················································</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">num_calls</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="7906624091-4">}</span><span·class="p"·data-group-id="7906624091-1">]</span></code></pre></li></ul>
972 ··</section>972 ··</section>
973 </section>973 </section>
974 <section·class="detail"·id="quickcheck/2">974 <section·class="detail"·id="quickcheck/2">
  
975 ··<div·class="detail-header">975 ··<div·class="detail-header">
976 ····<a·href="#quickcheck/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">976 ····<a·href="#quickcheck/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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1060 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1060 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1061 ····</footer>1061 ····</footer>
1062 ··</div>1062 ··</div>
1063 </main>1063 </main>
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143 <p>The·<a·href="ct_property_test.html#">ct_property_test</a>·module·does·the·following:</p><ul><li>Compiles·the·files·with·property·tests·in·the·subdirectory·<code·class="inline">property_test</code></li><li>Tests·properties·in·those·files·using·the·first·found·Property·Testing·Tool.</li><li>Saves·the·results·-·that·is·the·printouts·-·in·the·usual·Common·Test·Log</li></ul><h2·id="introductory-example"·class="section-heading">143 <p>The·<a·href="ct_property_test.html#">ct_property_test</a>·module·does·the·following:</p><ul><li>Compiles·the·files·with·property·tests·in·the·subdirectory·<code·class="inline">property_test</code></li><li>Tests·properties·in·those·files·using·the·first·found·Property·Testing·Tool.</li><li>Saves·the·results·-·that·is·the·printouts·-·in·the·usual·Common·Test·Log</li></ul><h2·id="introductory-example"·class="section-heading">
144 ··<a·href="#introductory-example"·class="hover-link">144 ··<a·href="#introductory-example"·class="hover-link">
145 ····<i·class="ri-link-m"·aria-hidden="true"></i>145 ····<i·class="ri-link-m"·aria-hidden="true"></i>
146 ··</a>146 ··</a>
147 ··<span·class="text">Introductory·Example</span>147 ··<span·class="text">Introductory·Example</span>
148 </h2>148 </h2>
149 <p>Assume·that·we·want·to·test·the·lists:sort/1·function.</p><p>We·need·a·property·to·test·the·function.·In·normal·way,·we·create149 <p>Assume·that·we·want·to·test·the·lists:sort/1·function.</p><p>We·need·a·property·to·test·the·function.·In·normal·way,·we·create
150 <code·class="inline">property_test/ct_prop.erl</code>·module·in·the·<code·class="inline">test</code>·directory·in·our·application:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6431360625-1">(</span><span·class="ss">ct_prop</span><span·class="p"·data-group-id="6431360625-1">)</span><span·class="p">.</span><span·class="w">150 <code·class="inline">property_test/ct_prop.erl</code>·module·in·the·<code·class="inline">test</code>·directory·in·our·application:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4222311410-1">(</span><span·class="ss">ct_prop</span><span·class="p"·data-group-id="4222311410-1">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6431360625-2">(</span><span·class="p"·data-group-id="6431360625-3">[</span><span·class="ss">prop_sort</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6431360625-3">]</span><span·class="p"·data-group-id="6431360625-2">)</span><span·class="p">.</span><span·class="w">151 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4222311410-2">(</span><span·class="p"·data-group-id="4222311410-3">[</span><span·class="ss">prop_sort</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4222311410-3">]</span><span·class="p"·data-group-id="4222311410-2">)</span><span·class="p">.</span><span·class="w">
  
152 </span><span·class="c1">%%%·This·will·include·the·.hrl·file·for·the·installed·testing·tool:</span><span·class="w">152 </span><span·class="c1">%%%·This·will·include·the·.hrl·file·for·the·installed·testing·tool:</span><span·class="w">
153 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6431360625-4">(</span><span·class="s">&quot;common_test/include/ct_property_test.hrl&quot;</span><span·class="p"·data-group-id="6431360625-4">)</span><span·class="p">.</span><span·class="w">153 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="4222311410-4">(</span><span·class="s">&quot;common_test/include/ct_property_test.hrl&quot;</span><span·class="p"·data-group-id="4222311410-4">)</span><span·class="p">.</span><span·class="w">
  
154 </span><span·class="c1">%%%·The·property·we·want·to·check:</span><span·class="w">154 </span><span·class="c1">%%%·The·property·we·want·to·check:</span><span·class="w">
155 </span><span·class="c1">%%%···For·all·possibly·unsorted·lists,</span><span·class="w">155 </span><span·class="c1">%%%···For·all·possibly·unsorted·lists,</span><span·class="w">
156 </span><span·class="c1">%%%···the·result·of·lists:sort/1·is·sorted.</span><span·class="w">156 </span><span·class="c1">%%%···the·result·of·lists:sort/1·is·sorted.</span><span·class="w">
157 </span><span·class="nf">prop_sort</span><span·class="p"·data-group-id="6431360625-5">(</span><span·class="p"·data-group-id="6431360625-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">prop_sort</span><span·class="p"·data-group-id="4222311410-5">(</span><span·class="p"·data-group-id="4222311410-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="o">?</span><span·class="n">FORALL</span><span·class="p"·data-group-id="6431360625-6">(</span><span·class="n">UnSorted</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list</span><span·class="p"·data-group-id="6431360625-7">(</span><span·class="p"·data-group-id="6431360625-7">)</span><span·class="p">,</span><span·class="w">158 ····</span><span·class="o">?</span><span·class="n">FORALL</span><span·class="p"·data-group-id="4222311410-6">(</span><span·class="n">UnSorted</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list</span><span·class="p"·data-group-id="4222311410-7">(</span><span·class="p"·data-group-id="4222311410-7">)</span><span·class="p">,</span><span·class="w">
159 ············</span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="6431360625-8">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">sort</span><span·class="p"·data-group-id="6431360625-9">(</span><span·class="n">UnSorted</span><span·class="p"·data-group-id="6431360625-9">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·09dd254369f0286dde74057527251f11b60408d87faa0e4b739394a40466e738·...·]-8">)</span><span·class="w">159 ············</span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="4222311410-8">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">sort</span><span·class="p"·data-group-id="4222311410-9">(</span><span·class="n">UnSorted</span><span·class="p"·data-group-id="4222311410-9">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·1ebb9abc018ade9d2eb085b499e8168d9df282c9ed9b159580b07c4d66f1e09e·...·]-8">)</span><span·class="w">
160 ···········</span><span·class="p"·data-group-id="6431360625-6">)</span><span·class="p">.</span><span·class="w">160 ···········</span><span·class="p"·data-group-id="4222311410-6">)</span><span·class="p">.</span><span·class="w">
  
161 </span><span·class="c1">%%%·Function·to·check·that·a·list·is·sorted:</span><span·class="w">161 </span><span·class="c1">%%%·Function·to·check·that·a·list·is·sorted:</span><span·class="w">
162 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="6431360625-10">(</span><span·class="p"·data-group-id="6431360625-11">[</span><span·class="p"·data-group-id="6431360625-11">]</span><span·class="p"·data-group-id="6431360625-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">162 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="4222311410-10">(</span><span·class="p"·data-group-id="4222311410-11">[</span><span·class="p"·data-group-id="4222311410-11">]</span><span·class="p"·data-group-id="4222311410-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
163 ····</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">163 ····</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
164 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="6431360625-12">(</span><span·class="p"·data-group-id="6431360625-13">[</span><span·class="p">_</span><span·class="p"·data-group-id="6431360625-13">]</span><span·class="p"·data-group-id="6431360625-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">164 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="4222311410-12">(</span><span·class="p"·data-group-id="4222311410-13">[</span><span·class="p">_</span><span·class="p"·data-group-id="4222311410-13">]</span><span·class="p"·data-group-id="4222311410-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
165 ····</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">165 ····</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
166 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="6431360625-14">(</span><span·class="p"·data-group-id="6431360625-15">[</span><span·class="n">H1</span><span·class="p">,</span><span·class="n">H2</span><span·class="p">|</span><span·class="n">SortedTail</span><span·class="p"·data-group-id="6431360625-15">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·2a65b3594b3599c623a41a4619add7f94f7aa1d600e3f6355478529ecd6ac822·...·]-14">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">H1</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="n">H2</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">166 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="4222311410-14">(</span><span·class="p"·data-group-id="4222311410-15">[</span><span·class="n">H1</span><span·class="p">,</span><span·class="n">H2</span><span·class="p">|</span><span·class="n">SortedTail</span><span·class="p"·data-group-id="4222311410-15">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·f84829e93509fa1f04e5258d5d6cd69ff9f7d66085686a1d8a4240930cbb0e98·...·]-14">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">H1</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="n">H2</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
167 ····</span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="6431360625-16">(</span><span·class="p"·data-group-id="6431360625-17">[</span><span·class="n">H2</span><span·class="p">|</span><span·class="n">SortedTail</span><span·class="p"·data-group-id="6431360625-17">]</span><span·class="p"·data-group-id="6431360625-16">)</span><span·class="p">;</span><span·class="w">167 ····</span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="4222311410-16">(</span><span·class="p"·data-group-id="4222311410-17">[</span><span·class="n">H2</span><span·class="p">|</span><span·class="n">SortedTail</span><span·class="p"·data-group-id="4222311410-17">]</span><span·class="p"·data-group-id="4222311410-16">)</span><span·class="p">;</span><span·class="w">
168 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="6431360625-18">(</span><span·class="p">_</span><span·class="p"·data-group-id="6431360625-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">168 </span><span·class="nf">is_sorted</span><span·class="p"·data-group-id="4222311410-18">(</span><span·class="p">_</span><span·class="p"·data-group-id="4222311410-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
169 ····</span><span·class="ss">false</span><span·class="p">.</span></code></pre><p>We·also·need·a·CommonTest·test·suite:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7249965798-1">(</span><span·class="ss">ct_property_test_SUITE</span><span·class="p"·data-group-id="7249965798-1">)</span><span·class="p">.</span><span·class="w">169 ····</span><span·class="ss">false</span><span·class="p">.</span></code></pre><p>We·also·need·a·CommonTest·test·suite:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9030927306-1">(</span><span·class="ss">ct_property_test_SUITE</span><span·class="p"·data-group-id="9030927306-1">)</span><span·class="p">.</span><span·class="w">
170 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="7249965798-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="7249965798-2">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Only·in·tests!</span><span·class="w">170 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="9030927306-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="9030927306-2">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Only·in·tests!</span><span·class="w">
171 </span><span·class="w">171 </span><span·class="w">
172 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7249965798-3">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="7249965798-3">)</span><span·class="p">.</span><span·class="w">172 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9030927306-3">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="9030927306-3">)</span><span·class="p">.</span><span·class="w">
  
173 </span><span·class="nf">all</span><span·class="p"·data-group-id="7249965798-4">(</span><span·class="p"·data-group-id="7249965798-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7249965798-5">[</span><span·class="ss">prop_sort</span><span·class="w">173 </span><span·class="nf">all</span><span·class="p"·data-group-id="9030927306-4">(</span><span·class="p"·data-group-id="9030927306-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9030927306-5">[</span><span·class="ss">prop_sort</span><span·class="w">
174 ·········</span><span·class="p"·data-group-id="7249965798-5">]</span><span·class="p">.</span><span·class="w">174 ·········</span><span·class="p"·data-group-id="9030927306-5">]</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="c1">%%%·First·prepare·Config·and·compile·the·property·tests·for·the·found·tool:</span><span·class="w">175 </span><span·class="c1">%%%·First·prepare·Config·and·compile·the·property·tests·for·the·found·tool:</span><span·class="w">
176 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7249965798-6">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7249965798-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="9030927306-6">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9030927306-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7249965798-7">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7249965798-7">)</span><span·class="p">.</span><span·class="w">177 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="9030927306-7">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9030927306-7">)</span><span·class="p">.</span><span·class="w">
  
178 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="7249965798-8">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7249965798-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="9030927306-8">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9030927306-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ····</span><span·class="n">Config</span><span·class="p">.</span><span·class="w">179 ····</span><span·class="n">Config</span><span·class="p">.</span><span·class="w">
  
180 </span><span·class="c1">%%%================================================================</span><span·class="w">180 </span><span·class="c1">%%%================================================================</span><span·class="w">
181 </span><span·class="c1">%%%·Test·suites</span><span·class="w">181 </span><span·class="c1">%%%·Test·suites</span><span·class="w">
182 </span><span·class="c1">%%%</span><span·class="w">182 </span><span·class="c1">%%%</span><span·class="w">
183 </span><span·class="nf">prop_sort</span><span·class="p"·data-group-id="7249965798-9">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7249965798-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">183 </span><span·class="nf">prop_sort</span><span·class="p"·data-group-id="9030927306-9">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9030927306-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
184 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">quickcheck</span><span·class="p"·data-group-id="7249965798-10">(</span><span·class="w">184 ····</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">quickcheck</span><span·class="p"·data-group-id="9030927306-10">(</span><span·class="w">
185 ······</span><span·class="nc">ct_prop</span><span·class="p">:</span><span·class="nf">prop_sort</span><span·class="p"·data-group-id="7249965798-11">(</span><span·class="p"·data-group-id="7249965798-11">)</span><span·class="p">,</span><span·class="w">185 ······</span><span·class="nc">ct_prop</span><span·class="p">:</span><span·class="nf">prop_sort</span><span·class="p"·data-group-id="9030927306-11">(</span><span·class="p"·data-group-id="9030927306-11">)</span><span·class="p">,</span><span·class="w">
186 ······</span><span·class="n">Config</span><span·class="w">186 ······</span><span·class="n">Config</span><span·class="w">
187 ·····</span><span·class="p"·data-group-id="7249965798-10">)</span><span·class="p">.</span></code></pre><p>We·run·it·as·usual,·for·example·with·ct_run·in·the·OS·shell:</p><pre><code·class="text">..../test$·ct_run·-suite·ct_property_test_SUITE187 ·····</span><span·class="p"·data-group-id="9030927306-10">)</span><span·class="p">.</span></code></pre><p>We·run·it·as·usual,·for·example·with·ct_run·in·the·OS·shell:</p><pre><code·class="text">..../test$·ct_run·-suite·ct_property_test_SUITE
188 .....188 .....
189 Common·Test:·Running·make·in·test·directories...189 Common·Test:·Running·make·in·test·directories...
  
190 TEST·INFO:·1·test(s),·1·case(s)·in·1·suite(s)190 TEST·INFO:·1·test(s),·1·case(s)·in·1·suite(s)
  
191 Testing·lib.common_test.ct_property_test_SUITE:·Starting·test,·1·test·cases191 Testing·lib.common_test.ct_property_test_SUITE:·Starting·test,·1·test·cases
  
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217 ....</code></pre><p><a·href=""·id="stateful1"></a></p><h2·id="a-stateful-testing-example"·class="section-heading">217 ....</code></pre><p><a·href=""·id="stateful1"></a></p><h2·id="a-stateful-testing-example"·class="section-heading">
218 ··<a·href="#a-stateful-testing-example"·class="hover-link">218 ··<a·href="#a-stateful-testing-example"·class="hover-link">
219 ····<i·class="ri-link-m"·aria-hidden="true"></i>219 ····<i·class="ri-link-m"·aria-hidden="true"></i>
220 ··</a>220 ··</a>
221 ··<span·class="text">A·stateful·testing·example</span>221 ··<span·class="text">A·stateful·testing·example</span>
222 </h2>222 </h2>
223 <p>Assume·a·test·that·generates·some·parallel·stateful·commands,·and·runs·300223 <p>Assume·a·test·that·generates·some·parallel·stateful·commands,·and·runs·300
224 tests:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">prop_parallel</span><span·class="p"·data-group-id="0927573804-1">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0927573804-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 tests:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">prop_parallel</span><span·class="p"·data-group-id="0846270629-1">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0846270629-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 ····</span><span·class="nf">numtests</span><span·class="p"·data-group-id="0927573804-2">(</span><span·class="mi">300</span><span·class="p">,</span><span·class="w">225 ····</span><span·class="nf">numtests</span><span·class="p"·data-group-id="0846270629-2">(</span><span·class="mi">300</span><span·class="p">,</span><span·class="w">
226 ·············</span><span·class="o">?</span><span·class="n">FORALL</span><span·class="p"·data-group-id="0927573804-3">(</span><span·class="n">Cmds</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">parallel_commands</span><span·class="p"·data-group-id="0927573804-4">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·8ba51499b2cb9e05c5139ed832e66f1634709c0eb2b0e87eaceebbc94bf2ef89·...·]-4">)</span><span·class="p">,</span><span·class="w">226 ·············</span><span·class="o">?</span><span·class="n">FORALL</span><span·class="p"·data-group-id="0846270629-3">(</span><span·class="n">Cmds</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">parallel_commands</span><span·class="p"·data-group-id="0846270629-4">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·39488ff56ddc30ac5dd22ae03706743e0fd394329f7f873eb22438281326f947·...·]-4">)</span><span·class="p">,</span><span·class="w">
227 ·····················</span><span·class="k">begin</span><span·class="w">227 ·····················</span><span·class="k">begin</span><span·class="w">
228 ·························</span><span·class="n">RunResult</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">run_parallel_commands</span><span·class="p"·data-group-id="0927573804-5">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p"·data-group-id="0927573804-5">)</span><span·class="p">,</span><span·class="w">228 ·························</span><span·class="n">RunResult</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">run_parallel_commands</span><span·class="p"·data-group-id="0846270629-5">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p"·data-group-id="0846270629-5">)</span><span·class="p">,</span><span·class="w">
229 ·························</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">present_result</span><span·class="p"·data-group-id="0927573804-6">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RunResult</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·ad100021b20b91b2e686aca7be594e2502b898ecf249e83a7fd43f0c110e3d2a·...·]-6">)</span><span·class="w">229 ·························</span><span·class="nc">ct_property_test</span><span·class="p">:</span><span·class="nf">present_result</span><span·class="p"·data-group-id="0846270629-6">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cmds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RunResult</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·658c46253d96d6c44fc42bd3dd05250d7210521e5afbb0c1fee7e32823ea5431·...·]-6">)</span><span·class="w">
230 ·····················</span><span·class="k">end</span><span·class="p"·data-group-id="0927573804-3">)</span><span·class="p"·data-group-id="0927573804-2">)</span><span·class="p">.</span></code></pre><p>The·<a·href="ct_property_test.html#present_result/4"><code·class="inline">ct_property_test:present_result/4</code></a>·is·a·help·function·for·printing·some230 ·····················</span><span·class="k">end</span><span·class="p"·data-group-id="0846270629-3">)</span><span·class="p"·data-group-id="0846270629-2">)</span><span·class="p">.</span></code></pre><p>The·<a·href="ct_property_test.html#present_result/4"><code·class="inline">ct_property_test:present_result/4</code></a>·is·a·help·function·for·printing·some
231 statistics·in·the·CommonTest·log·file.</p><p>Our·example·test·could·for·example·be·a·simple·test·of·an·ftp·server,·where·we231 statistics·in·the·CommonTest·log·file.</p><p>Our·example·test·could·for·example·be·a·simple·test·of·an·ftp·server,·where·we
232 perform·get,·put·and·delete·requests,·some·of·them·in·parallel.·Per·default,·the232 perform·get,·put·and·delete·requests,·some·of·them·in·parallel.·Per·default,·the
233 result·has·three·sections:</p><pre><code·class="text">***·User·2019-12-11·13:28:17.504·***233 result·has·three·sections:</p><pre><code·class="text">***·User·2019-12-11·13:28:17.504·***
  
234 Distribution·sequential/parallel234 Distribution·sequential/parallel
  
235 ·57.7%·sequential235 ·57.7%·sequential
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326 ······<p·class="built-using">326 ······<p·class="built-using">
327 ········Built·using327 ········Built·using
328 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the328 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
329 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>329 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
330 ······</p>330 ······</p>
331 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>331 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
332 ····</footer>332 ····</footer>
333 ··</div>333 ··</div>
334 </main>334 </main>
335 </div>335 </div>
336 <script>336 <script>
337 ··function·mermaidLoaded()·{337 ··function·mermaidLoaded()·{
338 ····mermaid.initialize({338 ····mermaid.initialize({
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553 ······<p·class="built-using">553 ······<p·class="built-using">
554 ········Built·using554 ········Built·using
555 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the555 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
556 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>556 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
557 ······</p>557 ······</p>
558 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>558 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
559 ····</footer>559 ····</footer>
560 ··</div>560 ··</div>
561 </main>561 </main>
562 </div>562 </div>
563 <script>563 <script>
564 ··function·mermaidLoaded()·{564 ··function·mermaidLoaded()·{
565 ····mermaid.initialize({565 ····mermaid.initialize({
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247 ··[-keep_logs·all·|·NLogs]</code></pre><h2·id="run-common-test-in-interactive-mode"·class="section-heading">247 ··[-keep_logs·all·|·NLogs]</code></pre><h2·id="run-common-test-in-interactive-mode"·class="section-heading">
248 ··<a·href="#run-common-test-in-interactive-mode"·class="hover-link">248 ··<a·href="#run-common-test-in-interactive-mode"·class="hover-link">
249 ····<i·class="ri-link-m"·aria-hidden="true"></i>249 ····<i·class="ri-link-m"·aria-hidden="true"></i>
250 ··</a>250 ··</a>
251 ··<span·class="text">Run·Common·Test·in·Interactive·Mode</span>251 ··<span·class="text">Run·Common·Test·in·Interactive·Mode</span>
252 </h2>252 </h2>
253 <pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="ss">ct_run</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">shell</span><span·class="w">253 <pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="ss">ct_run</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">shell</span><span·class="w">
254 ··</span><span·class="p"·data-group-id="6831686763-1">[</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="n">ConfigFile1</span><span·class="w">·</span><span·class="n">ConfigFile2</span><span·class="w">·</span><span·class="p">.</span><span·class="p">[·...·truncated·by·diffoscope;·len:·131,·SHA:·6b07de7d898052f565e1e51fda98e1d67707adc1209edd78e64bee7bdb2e06e3·...·]-1">]</span><span·class="w">254 ··</span><span·class="p"·data-group-id="1295345387-1">[</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="n">ConfigFile1</span><span·class="w">·</span><span·class="n">ConfigFile2</span><span·class="w">·</span><span·class="p">.</span><span·class="p">[·...·truncated·by·diffoscope;·len:·131,·SHA:·3fd43e4a2e416c4c659fa33179e755d0200c9ad30b498cc6e2da51754f30b9f0·...·]-1">]</span><span·class="w">
255 ··</span><span·class="p"·data-group-id="6831686763-2">[</span><span·class="o">-</span><span·class="ss">userconfig</span><span·class="w">·</span><span·class="n">CallbackModule1</span><span·class="w">·</span><span·class="n">ConfigString1</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">CallbackModule2</span><span·class="w">255 ··</span><span·class="p"·data-group-id="1295345387-2">[</span><span·class="o">-</span><span·class="ss">userconfig</span><span·class="w">·</span><span·class="n">CallbackModule1</span><span·class="w">·</span><span·class="n">ConfigString1</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">CallbackModule2</span><span·class="w">
256 ···</span><span·class="n">ConfigString2</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">CallbackModuleN</span><span·class="w">·</span><span·class="n">ConfigStringN</span><span·class="p"·data-group-id="6831686763-2">]</span><span·class="w">256 ···</span><span·class="n">ConfigString2</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">CallbackModuleN</span><span·class="w">·</span><span·class="n">ConfigStringN</span><span·class="p"·data-group-id="1295345387-2">]</span><span·class="w">
257 ··</span><span·class="p"·data-group-id="6831686763-3">[</span><span·class="o">-</span><span·class="ss">decrypt_key</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="6831686763-3">]</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·208,·SHA:·7c83ce9b9f97cd63221aa11a68170d3f58240454efdf7dd1f9a91709b4c74bb7·...·]-4">]</span></code></pre><h2·id="start-a-common-test-master-node"·class="section-heading">257 ··</span><span·class="p"·data-group-id="1295345387-3">[</span><span·class="o">-</span><span·class="ss">decrypt_key</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="1295345387-3">]</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·208,·SHA:·b35940e415276eb0bf7261ae5ad27f25144f39658fd7005b58fdeff72776765c·...·]-4">]</span></code></pre><h2·id="start-a-common-test-master-node"·class="section-heading">
258 ··<a·href="#start-a-common-test-master-node"·class="hover-link">258 ··<a·href="#start-a-common-test-master-node"·class="hover-link">
259 ····<i·class="ri-link-m"·aria-hidden="true"></i>259 ····<i·class="ri-link-m"·aria-hidden="true"></i>
260 ··</a>260 ··</a>
261 ··<span·class="text">Start·a·Common·Test·Master·Node</span>261 ··<span·class="text">Start·a·Common·Test·Master·Node</span>
262 </h2>262 </h2>
263 <pre><code·class="text">·ct_run·-ctmaster</code></pre><h2·id="see-also"·class="section-heading">263 <pre><code·class="text">·ct_run·-ctmaster</code></pre><h2·id="see-also"·class="section-heading">
264 ··<a·href="#see-also"·class="hover-link">264 ··<a·href="#see-also"·class="hover-link">
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306 ········Built·using306 ········Built·using
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308 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>308 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
309 ······</p>309 ······</p>
310 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>310 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
311 ····</footer>311 ····</footer>
312 ··</div>312 ··</div>
313 </main>313 </main>
314 </div>314 </div>
315 <script>315 <script>
316 ··function·mermaidLoaded()·{316 ··function·mermaidLoaded()·{
317 ····mermaid.initialize({317 ····mermaid.initialize({
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552 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>552 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
553 ······</p>553 ······</p>
554 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>554 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
555 ····</footer>555 ····</footer>
556 ··</div>556 ··</div>
557 </main>557 </main>
558 </div>558 </div>
559 <script>559 <script>
560 ··function·mermaidLoaded()·{560 ··function·mermaidLoaded()·{
561 ····mermaid.initialize({561 ····mermaid.initialize({
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146 configuration·files·have·default·values·set·by·the·<code·class="inline">SNMP</code>·application.·These146 configuration·files·have·default·values·set·by·the·<code·class="inline">SNMP</code>·application.·These
147 values·can·be·overridden·by·suppling·a·list·of·valid·configuration·values·or·a147 values·can·be·overridden·by·suppling·a·list·of·valid·configuration·values·or·a
148 file·located·in·the·test·suites·data·directory,·which·can·produce·a·list·of148 file·located·in·the·test·suites·data·directory,·which·can·produce·a·list·of
149 valid·configuration·values·if·you·apply·function·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#consult/1"><code·class="inline">file:consult/1</code></a>·to·the·file.</p><ul><li><p><strong><code·class="inline">{agent_contexts,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_community,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_sysinfo,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_vacm,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_usm,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_notify_def,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_target_address_def,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-149 valid·configuration·values·if·you·apply·function·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#consult/1"><code·class="inline">file:consult/1</code></a>·to·the·file.</p><ul><li><p><strong><code·class="inline">{agent_contexts,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_community,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_sysinfo,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_vacm,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_usm,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_notify_def,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-·Optional.</p></li><li><p><strong><code·class="inline">{agent_target_address_def,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-
150 Optional.</p></li><li><p><strong><code·class="inline">{agent_target_param_def,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-150 Optional.</p></li><li><p><strong><code·class="inline">{agent_target_param_def,·[term()]·|·{data_dir_file,·rel_path()}}</code></strong>·-
151 Optional.</p></li></ul><p>Parameter·<code·class="inline">MgrAgentConfName</code>·in·the·functions·is·to·be·a·name·you·allocate·in151 Optional.</p></li></ul><p>Parameter·<code·class="inline">MgrAgentConfName</code>·in·the·functions·is·to·be·a·name·you·allocate·in
152 your·test·suite·using·a·<code·class="inline">require</code>·statement.·Example·(where152 your·test·suite·using·a·<code·class="inline">require</code>·statement.·Example·(where
153 <code·class="inline">MgrAgentConfName·=·snmp_mgr_agent</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="8215838247-1">(</span><span·class="p"·data-group-id="8215838247-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8215838247-2">[</span><span·class="p"·data-group-id="8215838247-3">{</span[·...·truncated·by·diffoscope;·len:·683,·SHA:·0f5d8f1195007cc55c1e11a619a1b57c293aa11619b197dea699119d48a17ebf·...·]-1">)</span><span·class="p">.</span></code></pre><p>Notice·that·USM·users·are·needed·for·SNMPv3·configuration·and·are·not·to·be153 <code·class="inline">MgrAgentConfName·=·snmp_mgr_agent</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="2718563571-1">(</span><span·class="p"·data-group-id="2718563571-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2718563571-2">[</span><span·class="p"·data-group-id="2718563571-3">{</span[·...·truncated·by·diffoscope;·len:·683,·SHA:·6e3ea3e0c67dd16514587ad9fc1fbfbdc1f0e73e192de32b9a0e0501ec1a4ae2·...·]-1">)</span><span·class="p">.</span></code></pre><p>Notice·that·USM·users·are·needed·for·SNMPv3·configuration·and·are·not·to·be
154 confused·with·users.</p><p>SNMP·traps,·inform,·and·report·messages·are·handled·by·the·user·callback·module.154 confused·with·users.</p><p>SNMP·traps,·inform,·and·report·messages·are·handled·by·the·user·callback·module.
155 For·details,·see·the·<a·href="../../../../lib/snmp-5.18.2/doc/html/index.html"><code·class="inline">SNMP</code></a>·application.</p><p>It·is·recommended·to·use·the·<code·class="inline">.hrl</code>·files·created·by·the·Erlang/OTP·MIB·compiler155 For·details,·see·the·<a·href="../../../../lib/snmp-5.18.2/doc/html/index.html"><code·class="inline">SNMP</code></a>·application.</p><p>It·is·recommended·to·use·the·<code·class="inline">.hrl</code>·files·created·by·the·Erlang/OTP·MIB·compiler
156 to·define·the·Object·Identifiers·(OIDs).·For·example,·to·get·the·Erlang·node156 to·define·the·Object·Identifiers·(OIDs).·For·example,·to·get·the·Erlang·node
157 name·from·<code·class="inline">erlNodeTable</code>·in·the·OTP-MIB:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Oid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">erlNodeEntry</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="2617441190-1">[</span><span·class="o">?</span><span·class="ss">erlNodeName</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="2617441190-1">]</span></code></pre><p>Furthermore,·values·can·be·set·for·<code·class="inline">SNMP</code>·application·configuration·parameters,157 name·from·<code·class="inline">erlNodeTable</code>·in·the·OTP-MIB:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Oid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">erlNodeEntry</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="1460961474-1">[</span><span·class="o">?</span><span·class="ss">erlNodeName</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="1460961474-1">]</span></code></pre><p>Furthermore,·values·can·be·set·for·<code·class="inline">SNMP</code>·application·configuration·parameters,
158 <code·class="inline">config</code>,·<code·class="inline">server</code>,·<code·class="inline">net_if</code>,·and·so·on·(for·a·list·of·valid·parameters·and158 <code·class="inline">config</code>,·<code·class="inline">server</code>,·<code·class="inline">net_if</code>,·and·so·on·(for·a·list·of·valid·parameters·and
159 types,·see·the·<a·href="../../../../lib/snmp-5.18.2/doc/html/index.html"><code·class="inline">User's·Guide·for·the·SNMP·application</code></a>).159 types,·see·the·<a·href="../../../../lib/snmp-5.18.2/doc/html/index.html"><code·class="inline">User's·Guide·for·the·SNMP·application</code></a>).
160 This·is·done·by·defining·a·configuration·data·variable·on·the·following·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9309698160-1">{</span><span·class="ss">snmp_app</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9309698160-2">[</span><span·class="p"·data-group-id="9309698160-3">{</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9309698160-4">[</span><span·class="nf">snmp_app_manager_params</span><span·class="p"·data-group-id="9309698160-5">(</span><span·class="p"·data-group-id="9309698160-5">)</span><span·class="p"·data-group-id="9309698160-4">]</span><span·class="p"·data-group-id="9309698160-3">}</span><span·class="p">,</span><span·class="w"> 
161 ············</span><span·class="p"·data-group-id="9309698160-6">{</span><span·class="ss">agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9309698160-7">[</span><span·class="nf">snmp_app_agent_params</span><span·cla[·...·truncated·by·diffoscope;·len:·450,·SHA:·65dcf1b0343085f968b86a92ee12e8bbb687dfc976e8e3bc40f6019384b7dcdb·...·]160 This·is·done·by·defining·a·configuration·data·variable·on·the·following·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0964107659-1">{</span><span·class="ss">snmp_app</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·543,·SHA:·4d7737bdb931ee30d44cc86a6a11400838c6093117857bc1e6d05008b6952fae·...·]
 161 ············</span><span·class="p"·data-group-id="0964107659-6">{</span><span·class="ss">agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0964107659-7">[</span><span·class="nf">snmp_app_agent_params</span><span·class="p"·data-group-id="0964107659-8">(</span><span·class="p"·data-group-id="0964107659-8">)</span><span·class="p"·data-group-id="0964107659-7">]</span><span·class="p"·data-group-id="0964107659-6">}</span><span·class="p"·data-group-id="0964107659-2">]</span><span·class="p"·data-group-id="0964107659-1">}</span><span·class="p">.</span></code></pre><p>A·name·for·the·data·must·be·allocated·in·the·suite·using·<code·class="inline">require</code>·(see·the
162 example·above).·Pass·this·name·as·argument·<code·class="inline">SnmpAppConfName</code>·to162 example·above).·Pass·this·name·as·argument·<code·class="inline">SnmpAppConfName</code>·to
163 <a·href="#start/3"><code·class="inline">ct_snmp:start/3</code></a>.·<code·class="inline">ct_snmp</code>·specifies·default·values·for·some163 <a·href="#start/3"><code·class="inline">ct_snmp:start/3</code></a>.·<code·class="inline">ct_snmp</code>·specifies·default·values·for·some
164 <code·class="inline">SNMP</code>·application·configuration·parameters·(such·as·<code·class="inline">{verbosity,trace}</code>·for164 <code·class="inline">SNMP</code>·application·configuration·parameters·(such·as·<code·class="inline">{verbosity,trace}</code>·for
165 parameter·<code·class="inline">config</code>).·This·set·of·defaults·is·merged·with·the·parameters165 parameter·<code·class="inline">config</code>).·This·set·of·defaults·is·merged·with·the·parameters
166 specified·by·the·user.·The·user·values·override·<code·class="inline">ct_snmp</code>·defaults.</p>166 specified·by·the·user.·The·user·values·override·<code·class="inline">ct_snmp</code>·defaults.</p>
167 ····</section>167 ····</section>
  
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1840 ······<p·class="built-using">1840 ······<p·class="built-using">
1841 ········Built·using1841 ········Built·using
1842 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1842 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1843 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1843 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1844 ······</p>1844 ······</p>
1845 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1845 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1846 ····</footer>1846 ····</footer>
1847 ··</div>1847 ··</div>
1848 </main>1848 </main>
1849 </div>1849 </div>
1850 <script>1850 <script>
1851 ··function·mermaidLoaded()·{1851 ··function·mermaidLoaded()·{
1852 ····mermaid.initialize({1852 ····mermaid.initialize({
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129 ····<section·id="moduledoc">129 ····<section·id="moduledoc">
130 <p>SSH/SFTP·client·module.</p><p>This·module·uses·application·<code·class="inline">SSH</code>,·which·provides·detailed·information·about,130 <p>SSH/SFTP·client·module.</p><p>This·module·uses·application·<code·class="inline">SSH</code>,·which·provides·detailed·information·about,
131 for·example,·functions,·types,·and·options.</p><p>Argument·<code·class="inline">Server</code>·in·the·SFTP·functions·is·only·to·be·used·for·SFTP·sessions131 for·example,·functions,·types,·and·options.</p><p>Argument·<code·class="inline">Server</code>·in·the·SFTP·functions·is·only·to·be·used·for·SFTP·sessions
132 that·have·been·started·on·existing·SSH·connections·(that·is,·when·the·original132 that·have·been·started·on·existing·SSH·connections·(that·is,·when·the·original
133 connection·type·is·<code·class="inline">ssh</code>).·Whenever·the·connection·type·is·<code·class="inline">sftp</code>,·use·the·SSH133 connection·type·is·<code·class="inline">ssh</code>).·Whenever·the·connection·type·is·<code·class="inline">sftp</code>,·use·the·SSH
134 connection·reference·only.</p><p>The·following·options·are·valid·for·specifying·an·SSH/SFTP·connection·(that·is,134 connection·reference·only.</p><p>The·following·options·are·valid·for·specifying·an·SSH/SFTP·connection·(that·is,
135 can·be·used·as·configuration·elements):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7564835582-1">[</span><span·class="p"·data-group-id="7564835582-2">{</span><span·class="n">ConnType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p"·data-group-id="7564835582-2">}</span><span·class="p">,</span><span·class="w">135 can·be·used·as·configuration·elements):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7427539791-1">[</span><span·class="p"·data-group-id="7427539791-2">{</span><span·class="n">ConnType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p"·data-group-id="7427539791-2">}</span><span·class="p">,</span><span·class="w">
136 ·</span><span·class="p"·data-group-id="7564835582-3">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="7564835582-3">}</span><span·class="p">,</span><span·class="w">136 ·</span><span·class="p"·data-group-id="7427539791-3">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="7427539791-3">}</span><span·class="p">,</span><span·class="w">
137 ·</span><span·class="p"·data-group-id="7564835582-4">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserName</span><span·class="p"·data-group-id="7564835582-4">}</span><span·class="w">137 ·</span><span·class="p"·data-group-id="7427539791-4">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserName</span><span·class="p"·data-group-id="7427539791-4">}</span><span·class="w">
138 ·</span><span·class="p"·data-group-id="7564835582-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pwd</span><span·class="p"·data-group-id="7564835582-5">}</span><span·class="w">138 ·</span><span·class="p"·data-group-id="7427539791-5">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pwd</span><span·class="p"·data-group-id="7427539791-5">}</span><span·class="w">
139 ·</span><span·class="p"·data-group-id="7564835582-6">{</span><span·class="ss">user_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">String</span><span·class="p"·data-group-id="7564835582-6">}</span><span·class="w">139 ·</span><span·class="p"·data-group-id="7427539791-6">{</span><span·class="ss">user_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">String</span><span·class="p"·data-group-id="7427539791-6">}</span><span·class="w">
140 ·</span><span·class="p"·data-group-id="7564835582-7">{</span><span·class="ss">public_key_alg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PubKeyAlg</span><span·class="p"·data-group-id="7564835582-7">}</span><span·class="w">140 ·</span><span·class="p"·data-group-id="7427539791-7">{</span><span·class="ss">public_key_alg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PubKeyAlg</span><span·class="p"·data-group-id="7427539791-7">}</span><span·class="w">
141 ·</span><span·class="p"·data-group-id="7564835582-8">{</span><span·class="ss">connect_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="p"·data-group-id="7564835582-8">}</span><span·class="w">141 ·</span><span·class="p"·data-group-id="7427539791-8">{</span><span·class="ss">connect_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="p"·data-group-id="7427539791-8">}</span><span·class="w">
142 ·</span><span·class="p"·data-group-id="7564835582-9">{</span><span·class="ss">key_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="n">KeyCallbackMod</span><span·class="p"·data-group-id="7564835582-9">}</span><span·class="p"·data-group-id="7564835582-1">]</span></code></pre><p><code·class="inline">ConnType·=·ssh·|·sftp</code>.</p><p>For·other·types,·see·<a·href="../../../../lib/ssh-5.2.10/doc/html/ssh.html"><code·class="inline">ssh</code></a>.</p><p>All·time-out·parameters·in·<code·class="inline">ct_ssh</code>·functions·are·values·in·milliseconds.</p>142 ·</span><span·class="p"·data-group-id="7427539791-9">{</span><span·class="ss">key_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="n">KeyCallbackMod</span><span·class="p"·data-group-id="7427539791-9">}</span><span·class="p"·data-group-id="7427539791-1">]</span></code></pre><p><code·class="inline">ConnType·=·ssh·|·sftp</code>.</p><p>For·other·types,·see·<a·href="../../../../lib/ssh-5.2.10/doc/html/ssh.html"><code·class="inline">ssh</code></a>.</p><p>All·time-out·parameters·in·<code·class="inline">ct_ssh</code>·functions·are·values·in·milliseconds.</p>
143 ····</section>143 ····</section>
  
144 </div>144 </div>
  
145 ··<section·id="summary"·class="details-list">145 ··<section·id="summary"·class="details-list">
146 ····<h1·class="section-heading">146 ····<h1·class="section-heading">
147 ······<a·class="hover-link"·href="#summary">147 ······<a·class="hover-link"·href="#summary">
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3708 ······<p·class="built-using">3708 ······<p·class="built-using">
3709 ········Built·using3709 ········Built·using
3710 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3710 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3711 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3711 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3712 ······</p>3712 ······</p>
3713 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3713 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3714 ····</footer>3714 ····</footer>
3715 ··</div>3715 ··</div>
3716 </main>3716 </main>
3717 </div>3717 </div>
3718 <script>3718 <script>
3719 ··function·mermaidLoaded()·{3719 ··function·mermaidLoaded()·{
3720 ····mermaid.initialize({3720 ····mermaid.initialize({
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1586 ········Built·using1586 ········Built·using
1587 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1587 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1588 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1588 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1589 ······</p>1589 ······</p>
1590 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1590 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1591 ····</footer>1591 ····</footer>
1592 ··</div>1592 ··</div>
1593 </main>1593 </main>
1594 </div>1594 </div>
1595 <script>1595 <script>
1596 ··function·mermaidLoaded()·{1596 ··function·mermaidLoaded()·{
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132 matching·on·the·result.·For·information·about·how·to·use·<code·class="inline">ct_telnet</code>·and132 matching·on·the·result.·For·information·about·how·to·use·<code·class="inline">ct_telnet</code>·and
133 configure·connections,·specifically·for·UNIX·hosts,·see·the·<a·href="unix_telnet.html"><code·class="inline">unix_telnet</code></a>133 configure·connections,·specifically·for·UNIX·hosts,·see·the·<a·href="unix_telnet.html"><code·class="inline">unix_telnet</code></a>
134 manual·page.</p><p>Default·values·defined·in·<code·class="inline">ct_telnet</code>:</p><p><a·href=""·id="Default_values"></a></p><ul><li>Connection·timeout·(time·to·wait·for·connection)·=·10·seconds</li><li>Command·timeout·(time·to·wait·for·a·command·to·return)·=·10·seconds</li><li>Max·number·of·reconnection·attempts·=·3</li><li>Reconnection·interval·(time·to·wait·in·between·reconnection·attempts)·=·5134 manual·page.</p><p>Default·values·defined·in·<code·class="inline">ct_telnet</code>:</p><p><a·href=""·id="Default_values"></a></p><ul><li>Connection·timeout·(time·to·wait·for·connection)·=·10·seconds</li><li>Command·timeout·(time·to·wait·for·a·command·to·return)·=·10·seconds</li><li>Max·number·of·reconnection·attempts·=·3</li><li>Reconnection·interval·(time·to·wait·in·between·reconnection·attempts)·=·5
135 seconds</li><li>Keep·alive·(sends·NOP·to·the·server·every·8·sec·if·connection·is·idle)·=135 seconds</li><li>Keep·alive·(sends·NOP·to·the·server·every·8·sec·if·connection·is·idle)·=
136 <code·class="inline">true</code></li><li>Polling·limit·(max·number·of·times·to·poll·to·get·a·remaining·string136 <code·class="inline">true</code></li><li>Polling·limit·(max·number·of·times·to·poll·to·get·a·remaining·string
137 terminated)·=·0</li><li>Polling·interval·(sleep·time·between·polls)·=·1·second</li><li>The·TCP_NODELAY·option·for·the·telnet·socket·is·disabled·(set·to·<code·class="inline">false</code>)·per137 terminated)·=·0</li><li>Polling·interval·(sleep·time·between·polls)·=·1·second</li><li>The·TCP_NODELAY·option·for·the·telnet·socket·is·disabled·(set·to·<code·class="inline">false</code>)·per
138 default</li></ul><p>These·parameters·can·be·modified·by·the·user·with·the·following·configuration138 default</li></ul><p>These·parameters·can·be·modified·by·the·user·with·the·following·configuration
139 term:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2750754006-1">{</span><span·class="ss">telnet_settings</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2750754006-2">[</span><span·class="p"·data-group-id="2750754006-3">{</span><span·class="ss">connect_timeout</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="2750754006-3">}</span><span·class="p">,</span><span·class="w"> 
140 ···················</span><span·class="p"·data-group-id="2750754006-4">{</span><span·class="ss">command_timeout</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="2750754006-4">}</span><span·class="p">,</span><span·class="w">139 term:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6662103752-1">{</span><span·class="ss">telnet_settings</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6662103752-2">[</span><span·[·...·truncated·by·diffoscope;·len:·184,·SHA:·fd8b233f727dd1a0abb56fc129c797cb8c554c14015af0be2b401771f0d0eb4e·...·]">}</span><span·class="p">,</span><span·class="w">
 140 ···················</span><span·class="p"·data-group-id="6662103752-4">{</span><span·class="ss">command_timeout</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="6662103752-4">}</span><span·class="p">,</span><span·class="w">
141 ···················</span><span·class="p"·data-group-id="2750754006-5">{</span><span·class="ss">reconnection_attempts</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="2750754006-5">}</span><span·class="p">,</span><span·class="w">141 ···················</span><span·class="p"·data-group-id="6662103752-5">{</span><span·class="ss">reconnection_attempts</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="6662103752-5">}</span><span·class="p">,</span><span·class="w">
142 ···················</span><span·class="p"·data-group-id="2750754006-6">{</span><span·class="ss">reconnection_interval</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="2750754006-6">}</span><span·class="p">,</span><span·class="w">142 ···················</span><span·class="p"·data-group-id="6662103752-6">{</span><span·class="ss">reconnection_interval</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="6662103752-6">}</span><span·class="p">,</span><span·class="w">
143 ···················</span><span·class="p"·data-group-id="2750754006-7">{</span><span·class="ss">keep_alive</span><span·class="p">,</span><span·class="n">Bool</span><span·class="p"·data-group-id="2750754006-7">}</span><span·class="p">,</span><span·class="w">143 ···················</span><span·class="p"·data-group-id="6662103752-7">{</span><span·class="ss">keep_alive</span><span·class="p">,</span><span·class="n">Bool</span><span·class="p"·data-group-id="6662103752-7">}</span><span·class="p">,</span><span·class="w">
144 ···················</span><span·class="p"·data-group-id="2750754006-8">{</span><span·class="ss">poll_limit</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="2750754006-8">}</span><span·class="p">,</span><span·class="w">144 ···················</span><span·class="p"·data-group-id="6662103752-8">{</span><span·class="ss">poll_limit</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id="6662103752-8">}</span><span·class="p">,</span><span·class="w">
145 ···················</span><span·class="p"·data-group-id="2750754006-9">{</span><span·class="ss">poll_interval</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="2750754006-9">}</span><span·class="p">,</span><span·class="w">145 ···················</span><span·class="p"·data-group-id="6662103752-9">{</span><span·class="ss">poll_interval</span><span·class="p">,</span><span·class="n">Millisec</span><span·class="p"·data-group-id="6662103752-9">}</span><span·class="p">,</span><span·class="w">
146 ···················</span><span·class="p"·data-group-id="2750754006-10">{</span><span·class="ss">tcp_nodelay</span><span·class="p">,</span><span·class="n">Bool</span><span·class="p"·data-group-id="2750754006-10">}</span><span·class="p"·data-group-id="2750754006-2">]</span><span·class="p"·data-group-id="275075400[·...·truncated·by·diffoscope;·len:·1,·SHA:·e7f6c011776e8db7cd330b54174fd76f7d0216b612387a5ffcfb81e6f0919683·...·]-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">Millisec·=·integer(),·N·=·integer()</code></p><p>Enter·the·<code·class="inline">telnet_settings</code>·term·in·a·configuration·file·included·in·the·test146 ···················</span><span·class="p"·data-group-id="6662103752-10">{</span><span·class="ss">tcp_nodelay</span><span·class="p">,</span><span·class="n">Bool</span><span·class="p"·data-group-id="6662103752-10">}</span><span·class="p"·data-group-id="6662103752-2">]</span><span·class="p"·data-group-id="666210375[·...·truncated·by·diffoscope;·len:·1,·SHA:·d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35·...·]-1">}</span><span·class="p">.</span></code></pre><p><code·class="inline">Millisec·=·integer(),·N·=·integer()</code></p><p>Enter·the·<code·class="inline">telnet_settings</code>·term·in·a·configuration·file·included·in·the·test
147 and·<code·class="inline">ct_telnet</code>·retrieves·the·information·automatically.</p><p><code·class="inline">keep_alive</code>·can·be·specified·per·connection,·if·necessary.·For·details,·see147 and·<code·class="inline">ct_telnet</code>·retrieves·the·information·automatically.</p><p><code·class="inline">keep_alive</code>·can·be·specified·per·connection,·if·necessary.·For·details,·see
148 <a·href="unix_telnet.html"><code·class="inline">unix_telnet</code></a>.</p><h2·id="module-logging"·class="section-heading">148 <a·href="unix_telnet.html"><code·class="inline">unix_telnet</code></a>.</p><h2·id="module-logging"·class="section-heading">
149 ··<a·href="#module-logging"·class="hover-link">149 ··<a·href="#module-logging"·class="hover-link">
150 ····<i·class="ri-link-m"·aria-hidden="true"></i>150 ····<i·class="ri-link-m"·aria-hidden="true"></i>
151 ··</a>151 ··</a>
152 ··<span·class="text">Logging</span>152 ··<span·class="text">Logging</span>
153 </h2>153 </h2>
154 <p><a·href=""·id="Logging"></a></p><p>The·default·logging·behavior·of·<code·class="inline">ct_telnet</code>·is·to·print·information·about154 <p><a·href=""·id="Logging"></a></p><p>The·default·logging·behavior·of·<code·class="inline">ct_telnet</code>·is·to·print·information·about
155 performed·operations,·commands,·and·their·corresponding·results·to·the·test·case155 performed·operations,·commands,·and·their·corresponding·results·to·the·test·case
156 HTML·log.·The·following·is·not·printed·to·the·HTML·log:·text·strings·sent·from156 HTML·log.·The·following·is·not·printed·to·the·HTML·log:·text·strings·sent·from
157 the·Telnet·server·that·are·not·explicitly·received·by·a·<code·class="inline">ct_telnet</code>·function,157 the·Telnet·server·that·are·not·explicitly·received·by·a·<code·class="inline">ct_telnet</code>·function,
158 such·as·<a·href="#expect/3"><code·class="inline">expect/3</code></a>.·However,·<code·class="inline">ct_telnet</code>·can·be·configured·to·use158 such·as·<a·href="#expect/3"><code·class="inline">expect/3</code></a>.·However,·<code·class="inline">ct_telnet</code>·can·be·configured·to·use
159 a·special·purpose·event·handler,·implemented·in·<code·class="inline">ct_conn_log_h</code>,·for·logging159 a·special·purpose·event·handler,·implemented·in·<code·class="inline">ct_conn_log_h</code>,·for·logging
160 <em>all</em>·Telnet·traffic.·To·use·this·handler,·install·a·<code·class="inline">Common·Test</code>·hook·named160 <em>all</em>·Telnet·traffic.·To·use·this·handler,·install·a·<code·class="inline">Common·Test</code>·hook·named
161 <code·class="inline">cth_conn_log</code>.·Example·(using·the·test·suite·information·function):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="7853192225-1">(</span><span·class="p"·data-group-id="7853192225-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">161 <code·class="inline">cth_conn_log</code>.·Example·(using·the·test·suite·information·function):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="8757631942-1">(</span><span·class="p"·data-group-id="8757631942-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
162 ····</span><span·class="p"·data-group-id="7853192225-2">[</span><span·class="p"·data-group-id="7853192225-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7853192225-4">[</span><span·class="p"·data-group-id="7853192225-5">{</[·...·truncated·by·diffoscope;·len:·805,·SHA:·b36a860b7a914920d8a9188b3774deb9448978ab3a8035a0f3767bfd99ab6e7a·...·]-2">]</span><span·class="p">.</span></code></pre><p><code·class="inline">conn_mod()</code>·is·the·name·of·the·<code·class="inline">Common·Test</code>·module·implementing·the·connection162 ····</span><span·class="p"·data-group-id="8757631942-2">[</span><span·class="p"·data-group-id="8757631942-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8757631942-4">[</span><span·class="p"·data-group-id="8757631942-5">{</[·...·truncated·by·diffoscope;·len:·805,·SHA:·361debffa77d18115f735f2338a4a2521411ae2927f23810baee5d4c8d1bca80·...·]-2">]</span><span·class="p">.</span></code></pre><p><code·class="inline">conn_mod()</code>·is·the·name·of·the·<code·class="inline">Common·Test</code>·module·implementing·the·connection
163 protocol,·that·is,·<code·class="inline">ct_telnet</code>.</p><p>The·<code·class="inline">cth_conn_log</code>·hook·performs·unformatted·logging·of·Telnet·data·to·a163 protocol,·that·is,·<code·class="inline">ct_telnet</code>.</p><p>The·<code·class="inline">cth_conn_log</code>·hook·performs·unformatted·logging·of·Telnet·data·to·a
164 separate·text·file.·All·Telnet·communication·is·captured·and·printed,·including164 separate·text·file.·All·Telnet·communication·is·captured·and·printed,·including
165 any·data·sent·from·the·server.·The·link·to·this·text·file·is·located·at·the·top165 any·data·sent·from·the·server.·The·link·to·this·text·file·is·located·at·the·top
166 of·the·test·case·HTML·log.</p><p>By·default,·data·for·all·Telnet·connections·is·logged·in·one·common·file·(named166 of·the·test·case·HTML·log.</p><p>By·default,·data·for·all·Telnet·connections·is·logged·in·one·common·file·(named
167 <code·class="inline">default</code>),·which·can·get·messy,·for·example,·if·multiple·Telnet·sessions·are167 <code·class="inline">default</code>),·which·can·get·messy,·for·example,·if·multiple·Telnet·sessions·are
168 running·in·parallel.·Therefore·a·separate·log·file·can·be·created·for·each168 running·in·parallel.·Therefore·a·separate·log·file·can·be·created·for·each
169 connection.·To·configure·this,·use·hook·option·<code·class="inline">hosts</code>·and·list·the·names·of·the169 connection.·To·configure·this,·use·hook·option·<code·class="inline">hosts</code>·and·list·the·names·of·the
Offset 172, 23 lines modifiedOffset 172, 23 lines modified
172 default·value·of·this·option·is·<code·class="inline">raw</code>,·which·results·in·the·behavior·described172 default·value·of·this·option·is·<code·class="inline">raw</code>,·which·results·in·the·behavior·described
173 above.·If·the·value·is·set·to·<code·class="inline">html</code>,·all·Telnet·communication·is·printed·to·the173 above.·If·the·value·is·set·to·<code·class="inline">html</code>,·all·Telnet·communication·is·printed·to·the
174 test·case·HTML·log·instead.</p><p>For·raw·logs,·<code·class="inline">prefix</code>·option·can·be·used·for·adjusting·prefix·data174 test·case·HTML·log·instead.</p><p>For·raw·logs,·<code·class="inline">prefix</code>·option·can·be·used·for·adjusting·prefix·data
175 added·to·connection·log.·The·default·value·of·this·option·is175 added·to·connection·log.·The·default·value·of·this·option·is
176 <code·class="inline">disabled</code>,·which·results·with·no·prefix·data.·If·the·value·is·set·to176 <code·class="inline">disabled</code>,·which·results·with·no·prefix·data.·If·the·value·is·set·to
177 <code·class="inline">full</code>·prefix·contains·timestamp·and·additonal·information.·If·the177 <code·class="inline">full</code>·prefix·contains·timestamp·and·additonal·information.·If·the
178 value·is·set·to·<code·class="inline">short</code>·prefix·includes·only·human·readable·timestamp.</p><p>All·<code·class="inline">cth_conn_log</code>·hook·options·described·can·also·be·specified·in·a178 value·is·set·to·<code·class="inline">short</code>·prefix·includes·only·human·readable·timestamp.</p><p>All·<code·class="inline">cth_conn_log</code>·hook·options·described·can·also·be·specified·in·a
179 configuration·file·with·configuration·variable·<code·class="inline">ct_conn_log</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9714454327-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9714454327-2">[</span><span·class="p"·data-group-id="9714454327-3">{</span><span·class="ss">ct_telnet</span><span·class=[·...·truncated·by·diffoscope;·len:·242,·SHA:·a2da8e6e5eeb53b74035d5242882f9e202474dbc6bacadfa01e3673a843a16a7·...·]-5">}</span><span·class="p">,</span><span·class="w">179 configuration·file·with·configuration·variable·<code·class="inline">ct_conn_log</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0853209854-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0853209854-2">[</span><span·class="p"·data-group-id="0853209854-3">{</span><span·class="ss">ct_telnet</span><span·class=[·...·truncated·by·diffoscope;·len:·242,·SHA:·87d8c01d967d252f73a7f04f05c8af8af9c46ca85e14ffc4d9620a74f239b722·...·]-5">}</span><span·class="p">,</span><span·class="w">
180 ···························</span><span·class="p"·data-group-id="9714454327-6">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="9714454327-7">[</span><span·class="nf">key_or_name</span><span·class="p"·data-group-id="9714454327-8">(</span><span·class="p"·data-group-id="971445432[·...·truncated·by·diffoscope;·len:·319,·SHA:·3cf8cc6a1823ee9b5a8f8819977327c9d31afc096f3f261081767f21222c7433·...·]-1">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Hook·options·specified·in·a·configuration·file·overwrite·any·hard-coded·hook180 ···························</span><span·class="p"·data-group-id="0853209854-6">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="0853209854-7">[</span><span·class="nf">key_or_name</span><span·class="p"·data-group-id="0853209854-8">(</span><span·class="p"·data-group-id="085320985[·...·truncated·by·diffoscope;·len:·319,·SHA:·2d68988c922e2d27e23f3f53949da6971dadfc1baaf864f8de39c956209cffd5·...·]-1">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Hook·options·specified·in·a·configuration·file·overwrite·any·hard-coded·hook
181 options·in·the·test·suite.</p></section><p><a·href=""·id="Logging_example"></a></p><p><em>Logging·Example:</em></p><p>The·following·<code·class="inline">ct_hooks</code>·statement·causes·printing·of·Telnet·traffic·to·separate181 options·in·the·test·suite.</p></section><p><a·href=""·id="Logging_example"></a></p><p><em>Logging·Example:</em></p><p>The·following·<code·class="inline">ct_hooks</code>·statement·causes·printing·of·Telnet·traffic·to·separate
182 logs·for·the·connections·<code·class="inline">server1</code>·and·<code·class="inline">server2</code>.·Traffic·for·any·other182 logs·for·the·connections·<code·class="inline">server1</code>·and·<code·class="inline">server2</code>.·Traffic·for·any·other
183 connections·is·logged·in·the·default·Telnet·log.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="2271798117-1">(</span><span·class="p"·data-group-id="2271798117-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">183 connections·is·logged·in·the·default·Telnet·log.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="5043613870-1">(</span><span·class="p"·data-group-id="5043613870-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
184 ····</span><span·class="p"·data-group-id="2271798117-2">[</span><span·class="p"·data-group-id="2271798117-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">184 ····</span><span·class="p"·data-group-id="5043613870-2">[</span><span·class="p"·data-group-id="5043613870-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">
185 ······</span><span·class="p"·data-group-id="2271798117-4">[</span><span·class="p"·data-group-id="2271798117-5">{</span><span·class="ss">cth_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2271798117-6">[</span><span·class="p"·data-group-id="2271798117-7">{</span><span·class="ss">ct_telnet</span><span·class="p">,</span><span·class="p"·data-group-id="2271798117-8">[</span><span·class="p"·data-group-id="2271798117-9">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="2271798117-10">[</span><span·class="ss">server1</span><span·class="p">,</span><span·class="ss">server2</span><span·class="p"·data-group-id="2271798117-10">]</span><span·class="p"·data-group-id="2271798117-9">}</span><span·class="p"·data-group-id="2271798117-8">]</span><span·class="p"·data-group-id="2271798117-7">}</span><span·class="p"·data-group-id="2271798117-6">]</span><span·class="p"·data-group-id="2271798117-5">}</span><span·class="p"·data-group-id="2271798117-4">]</span><span·class="p"·data-group-id="2271798117-3">}</span><span·class="p"·data-group-id="2271798117-2">]</span><span·class="p">.</span></code></pre><p>As·previously·explained,·this·specification·can·also·be·provided·by·an·entry 
186 like·the·following·in·a·configuration·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0303686535-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·1151,·SHA:·3c06295844995020cf5e63f8f1f0103127775bbdc48e43a51a055ff328ed0b08·...·]185 ······</span><span·class="p"·data-group-id="5043613870-4">[</span><span·class="p"·data-group-id="5043613870-5">{</span><span·class="ss">cth_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5043613870-6">[</span>[·...·truncated·by·diffoscope;·len:·1003,·SHA:·7dcbde029c05237ced4b478a16765b26f9873f6f83a61c1aae22a415b4a8c09e·...·]
 186 like·the·following·in·a·configuration·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7670008167-1">{</span><span·class="ss">ct_conn_log</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7670008167-2">[</span><span·class="p"·data-group-id="7670008167-3">{</span><span·class="ss">ct_telnet</span><span·class="p">,</span><span·class="p"·data-group-id="7670008167-4">[</span><span·class="p"·data-group-id="7670008167-5">{</span><span·class="ss">hosts</span><span·class="p">,</span><span·class="p"·data-group-id="7670008167-6">[</span><span·class="ss">server1</span><span·class="p">,</span><span·class="ss">server2</span><span·class="p"·data-group-id="7670008167-6">]</span><span·class="p"·data-group-id="7670008167-5">}</span><span·class="p"·data-group-id="7670008167-4">]</span><span·class="p"·data-group-id="7670008167-3">}</span><span·class="p"·data-group-id="7670008167-2">]</span><span·class="p"·data-group-id="7670008167-1">}</span><span·class="p">.</span></code></pre><p>In·this·case·the·<code·class="inline">ct_hooks</code>·statement·in·the·test·suite·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="2685844022-1">(</span><span·class="p"·data-group-id="2685844022-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
187 ····</span><span·class="p"·data-group-id="6050969286-2">[</span><span·class="p"·data-group-id="6050969286-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6050969286-4">[</span><span·class="p"·data-group-id="6050969286-5">{</[·...·truncated·by·diffoscope;·len:·395,·SHA:·60571bcbe47a73c35b403767874eb7c0f095161ed5b6aba4ccb67a3ad495579b·...·]-2">]</span><span·class="p">.</span></code></pre><h2·id="module-see-also"·class="section-heading">187 ····</span><span·class="p"·data-group-id="2685844022-2">[</span><span·class="p"·data-group-id="2685844022-3">{</span><span·class="ss">ct_hooks</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2685844022-4">[</span><span·class="p"·data-group-id="2685844022-5">{</[·...·truncated·by·diffoscope;·len:·395,·SHA:·1e9c8083a7f745788a6df9fe5126b08b8e76aec06829929a0ceb596d581be0c5·...·]-2">]</span><span·class="p">.</span></code></pre><h2·id="module-see-also"·class="section-heading">
188 ··<a·href="#module-see-also"·class="hover-link">188 ··<a·href="#module-see-also"·class="hover-link">
189 ····<i·class="ri-link-m"·aria-hidden="true"></i>189 ····<i·class="ri-link-m"·aria-hidden="true"></i>
190 ··</a>190 ··</a>
191 ··<span·class="text">See·Also</span>191 ··<span·class="text">See·Also</span>
192 </h2>192 </h2>
193 <p><a·href="unix_telnet.html"><code·class="inline">unix_telnet</code></a></p>193 <p><a·href="unix_telnet.html"><code·class="inline">unix_telnet</code></a></p>
194 ····</section>194 ····</section>
Offset 865, 17 lines modifiedOffset 865, 17 lines modified
865 of·waiting·for·prompt.</p></li><li><p><strong><code·class="inline">repeat·|·repeat,·N</code></strong>·-·The·pattern(s)·must·be·matched·multiple·times.·If865 of·waiting·for·prompt.</p></li><li><p><strong><code·class="inline">repeat·|·repeat,·N</code></strong>·-·The·pattern(s)·must·be·matched·multiple·times.·If
866 <code·class="inline">N</code>·is·specified,·the·pattern(s)·are·matched·<code·class="inline">N</code>·times,·and·the·function866 <code·class="inline">N</code>·is·specified,·the·pattern(s)·are·matched·<code·class="inline">N</code>·times,·and·the·function
867 returns·<code·class="inline">HaltReason·=·done</code>.·This·option·can·be·interrupted·by·one·or·more867 returns·<code·class="inline">HaltReason·=·done</code>.·This·option·can·be·interrupted·by·one·or·more
868 <code·class="inline">HaltPatterns</code>.·<code·class="inline">MatchList</code>·is·always·returned,·that·is,·a·list·of·<code·class="inline">Match</code>868 <code·class="inline">HaltPatterns</code>.·<code·class="inline">MatchList</code>·is·always·returned,·that·is,·a·list·of·<code·class="inline">Match</code>
869 instead·of·only·one·<code·class="inline">Match</code>.·Also·<code·class="inline">HaltReason</code>·is·returned.</p></li><li><p><strong><code·class="inline">sequence</code></strong>·-·All·patterns·must·be·matched·in·a·sequence.·A·match·is·not869 instead·of·only·one·<code·class="inline">Match</code>.·Also·<code·class="inline">HaltReason</code>·is·returned.</p></li><li><p><strong><code·class="inline">sequence</code></strong>·-·All·patterns·must·be·matched·in·a·sequence.·A·match·is·not
870 concluded·until·all·patterns·are·matched.·This·option·can·be·interrupted·by870 concluded·until·all·patterns·are·matched.·This·option·can·be·interrupted·by
871 one·or·more·<code·class="inline">HaltPatterns</code>.·<code·class="inline">MatchList</code>·is·always·returned,·that·is,·a·list·of871 one·or·more·<code·class="inline">HaltPatterns</code>.·<code·class="inline">MatchList</code>·is·always·returned,·that·is,·a·list·of
872 <code·class="inline">Match</code>·instead·of·only·one·<code·class="inline">Match</code>.·Also·<code·class="inline">HaltReason</code>·is·returned.</p></li></ul><p><em>Example·1:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expect</span><span·class="p"·data-group-id="5173473022-1">(</span><span·class="n">Connection</span><span·class="p">,</span><span·class="p"·data-group-id="5173473022-2">[</span><span·class="p"·data-group-id="5173473022-3">{</span><span·class="ss">abc</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·1029,·SHA:·7e57d42cb3121d4fde8ec228a6201e052419ce5e388b42c32b399b16f747d580·...·]-1">)</span></code></pre><p>First·this·tries·to·match·<code·class="inline">&quot;ABC&quot;</code>,·and·then·<code·class="inline">&quot;XYZ&quot;</code>,·but·if·<code·class="inline">&quot;NNN&quot;</code>·appears,·the872 <code·class="inline">Match</code>·instead·of·only·one·<code·class="inline">Match</code>.·Also·<code·class="inline">HaltReason</code>·is·returned.</p></li></ul><p><em>Example·1:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expect</span><span·class="p"·data-group-id="4169263646-1">(</span><span·class="n">Connection</span><span·class="p">,</span><span·class="p"·data-group-id="4169263646-2">[</span><span·class="p"·data-group-id="4169263646-3">{</span><span·class="ss">abc</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·1029,·SHA:·8713e57c56426a4685af99367dab24c2bd66f2a63b5fa7f470051305711b7686·...·]-1">)</span></code></pre><p>First·this·tries·to·match·<code·class="inline">&quot;ABC&quot;</code>,·and·then·<code·class="inline">&quot;XYZ&quot;</code>,·but·if·<code·class="inline">&quot;NNN&quot;</code>·appears,·the
873 function·returns·<code·class="inline">{error,{nnn,[&quot;NNN&quot;]}}</code>.·If·both·<code·class="inline">&quot;ABC&quot;</code>·and·<code·class="inline">&quot;XYZ&quot;</code>·are873 function·returns·<code·class="inline">{error,{nnn,[&quot;NNN&quot;]}}</code>.·If·both·<code·class="inline">&quot;ABC&quot;</code>·and·<code·class="inline">&quot;XYZ&quot;</code>·are
874 matched,·the·function·returns·<code·class="inline">{ok,[AbcMatch,XyzMatch]}</code>.</p><p><em>Example·2:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expect</span><span·class="p"·data-group-id="8276350711-1">(</span><span·class="n">Connection</span><span·class="p">,</span><span·class="p"·data-group-id="8276350711-2">[</span><span·class="p"·data-group-id="8276350711-3">{</span><span·class="ss">abc</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·1182,·SHA:·7b49a72674150c903fdccb88092753ba3227f99e2c3f0ace55b2d3a43f83aba9·...·]-1">)</span></code></pre><p>This·tries·to·match·<code·class="inline">&quot;ABC&quot;</code>·or·<code·class="inline">&quot;XYZ&quot;</code>·twice.·If·<code·class="inline">&quot;NNN&quot;</code>·appears,·the·function874 matched,·the·function·returns·<code·class="inline">{ok,[AbcMatch,XyzMatch]}</code>.</p><p><em>Example·2:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expect</span><span·class="p"·data-group-id="2737587086-1">(</span><span·class="n">Connection</span><span·class="p">,</span><span·class="p"·data-group-id="2737587086-2">[</span><span·class="p"·data-group-id="2737587086-3">{</span><span·class="ss">abc</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·1182,·SHA:·c4860659ffd618504e245b24b7bf208703951af7e219dfe48ae97a737898fafa·...·]-1">)</span></code></pre><p>This·tries·to·match·<code·class="inline">&quot;ABC&quot;</code>·or·<code·class="inline">&quot;XYZ&quot;</code>·twice.·If·<code·class="inline">&quot;NNN&quot;</code>·appears,·the·function
875 returns·<code·class="inline">HaltReason·=·{nnn,[&quot;NNN&quot;]}</code>.</p><p>Options·<code·class="inline">repeat</code>·and·<code·class="inline">sequence</code>·can·be·combined·to·match·a·sequence·multiple875 returns·<code·class="inline">HaltReason·=·{nnn,[&quot;NNN&quot;]}</code>.</p><p>Options·<code·class="inline">repeat</code>·and·<code·class="inline">sequence</code>·can·be·combined·to·match·a·sequence·multiple
876 times.</p>876 times.</p>
877 ··</section>877 ··</section>
878 </section>878 </section>
879 <section·class="detail"·id="get_data/1">879 <section·class="detail"·id="get_data/1">
  
880 ··<div·class="detail-header">880 ··<div·class="detail-header">
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1189 ······<p·class="built-using">1189 ······<p·class="built-using">
1190 ········Built·using1190 ········Built·using
1191 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1191 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1192 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1192 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1193 ······</p>1193 ······</p>
1194 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1194 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1195 ····</footer>1195 ····</footer>
1196 ··</div>1196 ··</div>
1197 </main>1197 </main>
1198 </div>1198 </div>
1199 <script>1199 <script>
1200 ··function·mermaidLoaded()·{1200 ··function·mermaidLoaded()·{
1201 ····mermaid.initialize({1201 ····mermaid.initialize({
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234 ········Built·using234 ········Built·using
235 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the235 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
236 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>236 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
237 ······</p>237 ······</p>
238 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>238 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
239 ····</footer>239 ····</footer>
240 ··</div>240 ··</div>
241 </main>241 </main>
242 </div>242 </div>
243 <script>243 <script>
244 ··function·mermaidLoaded()·{244 ··function·mermaidLoaded()·{
245 ····mermaid.initialize({245 ····mermaid.initialize({
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157 between·the·cases·and·therefore·introduce·dependencies·between·them.</p><p>To·avoid·this,·we·can·consider·starting·and·stopping·the·server·for·every·test.157 between·the·cases·and·therefore·introduce·dependencies·between·them.</p><p>To·avoid·this,·we·can·consider·starting·and·stopping·the·server·for·every·test.
158 We·can·thus·implement·the·start·and·stop·action·as·common·functions·to·be·called158 We·can·thus·implement·the·start·and·stop·action·as·common·functions·to·be·called
159 from·<a·href="ct_suite.html#c:init_per_testcase/2"><code·class="inline">init_per_testcase</code></a>·and159 from·<a·href="ct_suite.html#c:init_per_testcase/2"><code·class="inline">init_per_testcase</code></a>·and
160 <a·href="ct_suite.html#c:end_per_testcase/2"><code·class="inline">end_per_testcase</code></a>.·(Remember·to·test·the160 <a·href="ct_suite.html#c:end_per_testcase/2"><code·class="inline">end_per_testcase</code></a>.·(Remember·to·test·the
161 start·and·stop·functionality·separately.)·The·configuration·can·also·be161 start·and·stop·functionality·separately.)·The·configuration·can·also·be
162 implemented·as·a·common·function,·maybe·grouped·with·the·start·function.162 implemented·as·a·common·function,·maybe·grouped·with·the·start·function.
163 Finally,·the·testing·of·connecting·and·disconnecting·a·client·can·be·grouped163 Finally,·the·testing·of·connecting·and·disconnecting·a·client·can·be·grouped
164 into·one·test·case.·The·resulting·suite·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2226904586-1">(</span><span·class="ss">my_server_SUITE</span><span·class="p"·data-group-id="2226904586-1">)</span><span·class="p">.</span><span·class="w">164 into·one·test·case.·The·resulting·suite·can·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2858374176-1">(</span><span·class="ss">my_server_SUITE</span><span·class="p"·data-group-id="2858374176-1">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="2226904586-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="2226904586-2">)</span><span·class="p">.</span><span·class="w">165 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="2858374176-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="2858374176-2">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2226904586-3">(</span><span·class="s">&quot;ct.hrl&quot;</span><span·class="p"·data-group-id="2226904586-3">)</span><span·class="p">.</span><span·class="w">166 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2858374176-3">(</span><span·class="s">&quot;ct.hrl&quot;</span><span·class="p"·data-group-id="2858374176-3">)</span><span·class="p">.</span><span·class="w">
  
167 </span><span·class="c1">%%%·init·and·end·functions...</span><span·class="w">167 </span><span·class="c1">%%%·init·and·end·functions...</span><span·class="w">
  
168 </span><span·class="nf">suite</span><span·class="p"·data-group-id="2226904586-4">(</span><span·class="p"·data-group-id="2226904586-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2226904586-5">[</span><span·class="p"·data-group-id="2226904586-6">{</span>[·...·truncated·by·diffoscope;·len:·185,·SHA:·02bd3b9c433acd6f123e9f59e54acc84aa244e4accb46e0e7d4f8740f4f1ef3b·...·]6-5">]</span><span·class="p">.</span><span·class="w">168 </span><span·class="nf">suite</span><span·class="p"·data-group-id="2858374176-4">(</span><span·class="p"·data-group-id="2858374176-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2858374176-5">[</span><span·class="p"·data-group-id="2858374176-6">{</span>[·...·truncated·by·diffoscope;·len:·185,·SHA:·a0a690b1bbb2c6e17068e263ce0ce70a3b7cf7fc135b15aa82e66fca2a71bae1·...·]6-5">]</span><span·class="p">.</span><span·class="w">
  
169 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="2226904586-7">(</span><span·class="ss">start_and_stop</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="2858374176-7">(</span><span·class="ss">start_and_stop</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 ····</span><span·class="n">Config</span><span·class="p">;</span><span·class="w">170 ····</span><span·class="n">Config</span><span·class="p">;</span><span·class="w">
  
171 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="2226904586-8">(</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="2858374176-8">(</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ····</span><span·class="p"·data-group-id="2226904586-9">[</span><span·class="p"·data-group-id="2226904586-10">{</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="nf">start_server</span><span·class="p"·data-group-id="2226904586-11">(</span><span·class="p"·data-group-id="22[·...·truncated·by·diffoscope;·len:·216,·SHA:·579553b5775f8a3555b4f44bfc2de8a78d543355ecbf6e384f0f00c7e63c0595·...·]6-9">]</span><span·class="p">;</span><span·class="w">172 ····</span><span·class="p"·data-group-id="2858374176-9">[</span><span·class="p"·data-group-id="2858374176-10">{</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="nf">start_server</span><span·class="p"·data-group-id="2858374176-11">(</span><span·class="p"·data-group-id="28[·...·truncated·by·diffoscope;·len:·216,·SHA:·2681c72f3f9ea840f196212f148436f059574dd8b5b463555b334bc15bbac2a2·...·]6-9">]</span><span·class="p">;</span><span·class="w">
  
173 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="2226904586-12">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="2858374176-12">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_server</span><span·class="p"·data-group-id="2226904586-13">(</span><span·class="p"·data-group-id="2226904586-13">)</span><span·class="p">,</span><span·class="w">174 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_server</span><span·class="p"·data-group-id="2858374176-13">(</span><span·class="p"·data-group-id="2858374176-13">)</span><span·class="p">,</span><span·class="w">
175 ····</span><span·class="nf">configure_server</span><span·class="p"·data-group-id="2226904586-14">(</span><span·class="p"·data-group-id="2226904586-14">)</span><span·class="p">,</span><span·class="w">175 ····</span><span·class="nf">configure_server</span><span·class="p"·data-group-id="2858374176-14">(</span><span·class="p"·data-group-id="2858374176-14">)</span><span·class="p">,</span><span·class="w">
176 ····</span><span·class="p"·data-group-id="2226904586-15">[</span><span·class="p"·data-group-id="2226904586-16">{</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-16">}</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·105,·SHA:·662e946c54eadc028353b38c1ecb13f8bf72d41b9b4e19539fb009975f404614·...·]6-15">]</span><span·class="p">.</span><span·class="w">176 ····</span><span·class="p"·data-group-id="2858374176-15">[</span><span·class="p"·data-group-id="2858374176-16">{</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-16">}</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·105,·SHA:·f56f4230a019f6fea09680e57bb743127d411eab1624ac7955419fdef69943bd·...·]6-15">]</span><span·class="p">.</span><span·class="w">
  
177 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="2226904586-17">(</span><span·class="ss">start_and_stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="2226904586-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">177 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="2858374176-17">(</span><span·class="ss">start_and_stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="2858374176-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
178 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">178 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
  
179 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="2226904586-18">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">179 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="2858374176-18">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
180 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2226904586-19">(</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-19">)</span><span·class="p">,</span><span·class="w">180 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2858374176-19">(</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-19">)</span><span·class="p">,</span><span·class="w">
181 ····</span><span·class="nf">stop_server</span><span·class="p"·data-group-id="2226904586-20">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-20">)</span><span·class="p">.</span><span·class="w">181 ····</span><span·class="nf">stop_server</span><span·class="p"·data-group-id="2858374176-20">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-20">)</span><span·class="p">.</span><span·class="w">
  
182 </span><span·class="c1">%%%·test·cases...</span><span·class="w">182 </span><span·class="c1">%%%·test·cases...</span><span·class="w">
  
183 </span><span·class="nf">all</span><span·class="p"·data-group-id="2226904586-21">(</span><span·class="p"·data-group-id="2226904586-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2226904586-22">[</span><span·class="ss">start_and_stop</span><span·class=[·...·truncated·by·diffoscope;·len:·200,·SHA:·e6753837413ed97bf7277fe0074a6d4dc8f13b79d0d2835b36754ea71864f50a·...·]6-22">]</span><span·class="p">.</span><span·class="w">183 </span><span·class="nf">all</span><span·class="p"·data-group-id="2858374176-21">(</span><span·class="p"·data-group-id="2858374176-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2858374176-22">[</span><span·class="ss">start_and_stop</span><span·class=[·...·truncated·by·diffoscope;·len:·200,·SHA:·04d912c63e4b3c6145e1d1e5466a44ea8e16622b5894e9e53d73f29e766a3d97·...·]6-22">]</span><span·class="p">.</span><span·class="w">
  
184 </span><span·class="c1">%%·test·that·starting·and·stopping·works</span><span·class="w">184 </span><span·class="c1">%%·test·that·starting·and·stopping·works</span><span·class="w">
185 </span><span·class="nf">start_and_stop</span><span·class="p"·data-group-id="2226904586-23">(</span><span·class="p">_</span><span·class="p"·data-group-id="2226904586-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">185 </span><span·class="nf">start_and_stop</span><span·class="p"·data-group-id="2858374176-23">(</span><span·class="p">_</span><span·class="p"·data-group-id="2858374176-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
186 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_server</span><span·class="p"·data-group-id="2226904586-24">(</span><span·class="p"·data-group-id="2226904586-24">)</span><span·class="p">,</span><span·class="w">186 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_server</span><span·class="p"·data-group-id="2858374176-24">(</span><span·class="p"·data-group-id="2858374176-24">)</span><span·class="p">,</span><span·class="w">
187 ····</span><span·class="nf">stop_server</span><span·class="p"·data-group-id="2226904586-25">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-25">)</span><span·class="p">.</span><span·class="w">187 ····</span><span·class="nf">stop_server</span><span·class="p"·data-group-id="2858374176-25">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-25">)</span><span·class="p">.</span><span·class="w">
  
188 </span><span·class="c1">%%·configuration·test</span><span·class="w">188 </span><span·class="c1">%%·configuration·test</span><span·class="w">
189 </span><span·class="nf">config</span><span·class="p"·data-group-id="2226904586-26">(</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">189 </span><span·class="nf">config</span><span·class="p"·data-group-id="2858374176-26">(</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
190 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2226904586-27">(</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-27">)</span><span·class="p">,</span><span·class="w">190 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2858374176-27">(</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-27">)</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="nf">configure_server</span><span·class="p"·data-group-id="2226904586-28">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-28">)</span><span·class="p">.</span><span·class="w">191 ····</span><span·class="nf">configure_server</span><span·class="p"·data-group-id="2858374176-28">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-28">)</span><span·class="p">.</span><span·class="w">
  
192 </span><span·class="c1">%%·test·connecting·and·disconnecting·client</span><span·class="w">192 </span><span·class="c1">%%·test·connecting·and·disconnecting·client</span><span·class="w">
193 </span><span·class="nf">connect_and_disconnect</span><span·class="p"·data-group-id="2226904586-29">(</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 </span><span·class="nf">connect_and_disconnect</span><span·class="p"·data-group-id="2858374176-29">(</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2226904586-30">(</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2226904586-30">)</span><span·class="p">,</span><span·class="w">194 ····</span><span·class="n">ServerPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2858374176-30">(</span><span·class="ss">server_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="2858374176-30">)</span><span·class="p">,</span><span·class="w">
195 ····</span><span·class="p"·data-group-id="2226904586-31">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="2226904586-31">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server[·...·truncated·by·diffoscope;·len:·188,·SHA:·2944c038aebc4f4033b8dcd625548046b812cc4101fdc9328c313f24ea6c6302·...·]6-32">)</span><span·class="p">,</span><span·class="w">195 ····</span><span·class="p"·data-group-id="2858374176-31">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="2858374176-31">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server[·...·truncated·by·diffoscope;·len:·188,·SHA:·bc0248f8b83b175acce77bac45ea6c848344d66c4dfe808781605b7556d6c7fd·...·]6-32">)</span><span·class="p">,</span><span·class="w">
196 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="2226904586-33">(</span><span·class="n">ServerPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SessionId</span><span·class="p"·data-group-id="2226904586-33">)</span><span·class="p">.</span><span·class="w">196 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="2858374176-33">(</span><span·class="n">ServerPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SessionId</span><span·class="p"·data-group-id="2858374176-33">)</span><span·class="p">.</span><span·class="w">
  
197 </span><span·class="c1">%%%·common·functions...</span><span·class="w">197 </span><span·class="c1">%%%·common·functions...</span><span·class="w">
  
198 </span><span·class="nf">start_server</span><span·class="p"·data-group-id="2226904586-34">(</span><span·class="p"·data-group-id="2226904586-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 </span><span·class="nf">start_server</span><span·class="p"·data-group-id="2858374176-34">(</span><span·class="p"·data-group-id="2858374176-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ····</span><span·class="p"·data-group-id="2226904586-35">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-35">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server[·...·truncated·by·diffoscope;·len:·154,·SHA:·b597208f68be7782fef872142891f5a495709ebda66f463e4eac56d448c28689·...·]6-36">)</span><span·class="p">,</span><span·class="w">199 ····</span><span·class="p"·data-group-id="2858374176-35">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-35">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server[·...·truncated·by·diffoscope;·len:·154,·SHA:·25121aa9f54714cb97c210fe492c6c05452a4f3c3dc6edb258ab3481f9726f25·...·]6-36">)</span><span·class="p">,</span><span·class="w">
200 ····</span><span·class="n">ServerPid</span><span·class="p">.</span><span·class="w">200 ····</span><span·class="n">ServerPid</span><span·class="p">.</span><span·class="w">
  
201 </span><span·class="nf">stop_server</span><span·class="p"·data-group-id="2226904586-37">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">201 </span><span·class="nf">stop_server</span><span·class="p"·data-group-id="2858374176-37">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
202 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="2226904586-38">(</span><span·class="p"·data-group-id="2226904586-38">)</span><span·class="p">,</span><span·class="w">202 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="2858374176-38">(</span><span·class="p"·data-group-id="2858374176-38">)</span><span·class="p">,</span><span·class="w">
203 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">203 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
204 </span><span·class="nf">configure_server</span><span·class="p"·data-group-id="2226904586-39">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2226904586-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">204 </span><span·class="nf">configure_server</span><span·class="p"·data-group-id="2858374176-39">(</span><span·class="n">ServerPid</span><span·class="p"·data-group-id="2858374176-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
205 ····</span><span·class="n">ServerCfgData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="2226904586-40">(</span><span·class="ss">my_server_cfg</span><span·class="p"·data-group-id="2226904586-40">)</span><span·class="p">,</span><span·class="w">205 ····</span><span·class="n">ServerCfgData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">get_config</span><span·class="p"·data-group-id="2858374176-40">(</span><span·class="ss">my_server_cfg</span><span·class="p"·data-group-id="2858374176-40">)</span><span·class="p">,</span><span·class="w">
206 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">configure</span><span·class="p"·data-group-id="2226904586-41">(</span><span·class="n">ServerPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ServerCfgData</span><span·class="p"·data-group-id="2226904586-41">)</span><span·class="p">,</span><span·class="w">206 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">my_server</span><span·class="p">:</span><span·class="nf">configure</span><span·class="p"·data-group-id="2858374176-41">(</span><span·class="n">ServerPid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ServerCfgData</span><span·class="p"·data-group-id="2858374176-41">)</span><span·class="p">,</span><span·class="w">
207 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p><a·href=""·id="save_config"></a></p><h2·id="saving-configuration-data"·class="section-heading">207 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p><a·href=""·id="save_config"></a></p><h2·id="saving-configuration-data"·class="section-heading">
208 ··<a·href="#saving-configuration-data"·class="hover-link">208 ··<a·href="#saving-configuration-data"·class="hover-link">
209 ····<i·class="ri-link-m"·aria-hidden="true"></i>209 ····<i·class="ri-link-m"·aria-hidden="true"></i>
210 ··</a>210 ··</a>
211 ··<span·class="text">Saving·Configuration·Data</span>211 ··<span·class="text">Saving·Configuration·Data</span>
212 </h2>212 </h2>
213 <p>Sometimes·it·is·impossible,·or·infeasible,·to·implement·independent·test·cases.213 <p>Sometimes·it·is·impossible,·or·infeasible,·to·implement·independent·test·cases.
Offset 243, 48 lines modifiedOffset 243, 48 lines modified
243 <code·class="inline">Saver</code>·is·always·matched·to·the·expected·name·of·the·saving·test·case.·This243 <code·class="inline">Saver</code>·is·always·matched·to·the·expected·name·of·the·saving·test·case.·This
244 way,·problems·because·of·restructuring·of·the·test·suite·can·be·avoided.·Also,244 way,·problems·because·of·restructuring·of·the·test·suite·can·be·avoided.·Also,
245 it·makes·the·dependency·more·explicit·and·the·test·suite·easier·to·read·and245 it·makes·the·dependency·more·explicit·and·the·test·suite·easier·to·read·and
246 maintain.</p><p>To·pass·data·from·one·test·suite·to·another,·the·same·mechanism·is·used.·The246 maintain.</p><p>To·pass·data·from·one·test·suite·to·another,·the·same·mechanism·is·used.·The
247 data·is·to·be·saved·by·finction·<a·href="ct_suite.html#c:end_per_suite/1"><code·class="inline">end_per_suite</code></a>247 data·is·to·be·saved·by·finction·<a·href="ct_suite.html#c:end_per_suite/1"><code·class="inline">end_per_suite</code></a>
248 and·read·by·function·<a·href="ct_suite.html#c:init_per_suite/1"><code·class="inline">init_per_suite</code></a>·in·the248 and·read·by·function·<a·href="ct_suite.html#c:init_per_suite/1"><code·class="inline">init_per_suite</code></a>·in·the
249 suite·that·follows.·When·passing·data·between·suites,·<code·class="inline">Saver</code>·carries·the·name249 suite·that·follows.·When·passing·data·between·suites,·<code·class="inline">Saver</code>·carries·the·name
250 of·the·test·suite.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7859050100-1">(</span><span·class="ss">server_b_SUITE</span><span·class="p"·data-group-id="7859050100-1">)</span><span·class="p">.</span><span·class="w">250 of·the·test·suite.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5296110918-1">(</span><span·class="ss">server_b_SUITE</span><span·class="p"·data-group-id="5296110918-1">)</span><span·class="p">.</span><span·class="w">
251 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="7859050100-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="7859050100-2">)</span><span·class="p">.</span><span·class="w">251 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="5296110918-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="5296110918-2">)</span><span·class="p">.</span><span·class="w">
252 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7859050100-3">(</span><span·class="s">&quot;ct.hrl&quot;</span><span·class="p"·data-group-id="7859050100-3">)</span><span·class="p">.</span><span·class="w">252 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="5296110918-3">(</span><span·class="s">&quot;ct.hrl&quot;</span><span·class="p"·data-group-id="5296110918-3">)</span><span·class="p">.</span><span·class="w">
  
253 </span><span·class="c1">%%%·init·and·end·functions...</span><span·class="w">253 </span><span·class="c1">%%%·init·and·end·functions...</span><span·class="w">
  
254 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7859050100-4">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7859050100-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">254 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="5296110918-4">(</span><span·class="n">Config</span><span·class="p"·data-group-id="5296110918-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
255 ····</span><span·class="c1">%%·read·config·saved·by·previous·test·suite</span><span·class="w">255 ····</span><span·class="c1">%%·read·config·saved·by·previous·test·suite</span><span·class="w">
256 ····</span><span·class="p"·data-group-id="7859050100-5">{</span><span·class="ss">server_a_SUITE</span><span·class="p">,</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="7859050100-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc[·...·truncated·by·diffoscope;·len:·282,·SHA:·f7f492f35265843f6ad808045518bbbdf2709bd3aa5328f55384b4f9fc6275d8·...·]-6">)</span><span·class="p">,</span><span·class="w">256 ····</span><span·class="p"·data-group-id="5296110918-5">{</span><span·class="ss">server_a_SUITE</span><span·class="p">,</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="5296110918-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc[·...·truncated·by·diffoscope;·len:·282,·SHA:·602559c16e4ef275df920623021b8bcddbcb6bdc573eaeb557892b0e4e4da618·...·]-6">)</span><span·class="p">,</span><span·class="w">
257 ····</span><span·class="c1">%%·extract·server·identity·(comes·from·server_a_SUITE)</span><span·class="w">257 ····</span><span·class="c1">%%·extract·server·identity·(comes·from·server_a_SUITE)</span><span·class="w">
258 ····</span><span·class="n">ServerId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7859050100-7">(</span><span·class="ss">server_id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="7859050100-7">)</span><span·class="p">,</span><span·class="w">258 ····</span><span·class="n">ServerId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="5296110918-7">(</span><span·class="ss">server_id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="5296110918-7">)</span><span·class="p">,</span><span·class="w">
259 ····</span><span·class="n">SessionId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">connect_to_server</span><span·class="p"·data-group-id="7859050100-8">(</span><span·class="n">ServerId</span><span·class="p"·data-group-id="7859050100-8">)</span><span·class="p">,</span><span·class="w"> 
260 ····</span><span·class="p"·data-group-id="7859050100-9">[</span><span·class="p"·data-group-id="7859050100-10">{</span><span·class="ss">ids</span><span·class="p">,</span><span·class="p"·data-group-id="7859050100-11">{</span><span·class="n">ServerId</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·309,·SHA:·d3f93f853ab22cb191b7f401ad2137ba9b36fc67c131bb0a067f53692bc331b9·...·]</span><span·class="w">259 ····</span><span·class="n">SessionId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">connect_to_server</span><span·class="p"·data-group-id="5296110918-8">(</span><span·class="n">ServerId</span><span·class="p"·data-group-id="529611091[·...·truncated·by·diffoscope;·len:·30,·SHA:·8a5f5dea25305ae4681663623f63d4297bc09d25170a67e657231fd3dd7a3c3b·...·]</span><span·class="w">
 260 ····</span><span·class="p"·data-group-id="5296110918-9">[</span><span·class="p"·data-group-id="5296110918-10">{</span><span·class="ss">ids</span><span·class="p">,</span><span·class="p"·data-group-id="5296110918-11">{</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="5296110918-11">}</span><span·class="p"·data-group-id="5296110918-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="5296110918-9">]</span><span·class="p">.</span><span·class="w">
  
261 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="7859050100-12">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7859050100-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">261 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="5296110918-12">(</span><span·class="n">Config</span><span·class="p"·data-group-id="5296110918-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
262 ····</span><span·class="c1">%%·save·config·for·server_c_SUITE·(session_id·and·server_id)</span><span·class="w">262 ····</span><span·class="c1">%%·save·config·for·server_c_SUITE·(session_id·and·server_id)</span><span·class="w">
263 ····</span><span·class="p"·data-group-id="7859050100-13">{</span><span·class="ss">save_config</span><span·class="p">,</span><span·class="n">Config</span><span·class="p"·data-group-id="7859050100-13">}</span><span·class="w">263 ····</span><span·class="p"·data-group-id="5296110918-13">{</span><span·class="ss">save_config</span><span·class="p">,</span><span·class="n">Config</span><span·class="p"·data-group-id="5296110918-13">}</span><span·class="w">
  
264 </span><span·class="c1">%%%·test·cases...</span><span·class="w">264 </span><span·class="c1">%%%·test·cases...</span><span·class="w">
  
265 </span><span·class="nf">all</span><span·class="p"·data-group-id="7859050100-14">(</span><span·class="p"·data-group-id="7859050100-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7859050100-15">[</span><span·class="ss">allocate</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·106,·SHA:·2d0dc6b445691997f0bc656ae965f14253ca8217921ec48ca0ccf08dd1bb5bd9·...·]-15">]</span><span·class="p">.</span><span·class="w">265 </span><span·class="nf">all</span><span·class="p"·data-group-id="5296110918-14">(</span><span·class="p"·data-group-id="5296110918-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5296110918-15">[</span><span·class="ss">allocate</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·106,·SHA:·16ad11e15537109c534320359ce91cedb2eaca0197220d52f72b76b35d721b87·...·]-15">]</span><span·class="p">.</span><span·class="w">
  
266 </span><span·class="nf">allocate</span><span·class="p"·data-group-id="7859050100-16">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7859050100-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">266 </span><span·class="nf">allocate</span><span·class="p"·data-group-id="5296110918-16">(</span><span·class="n">Config</span><span·class="p"·data-group-id="5296110918-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
267 ····</span><span·class="p"·data-group-id="7859050100-17">{</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="7859050100-17">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">pro[·...·truncated·by·diffoscope;·len:·269,·SHA:·ee1f633da0be18b1b448545ff91b6ae9416fc6c5fe3b0edf6ac32b986a622785·...·]-18">)</span><span·class="p">,</span><span·class="w">267 ····</span><span·class="p"·data-group-id="5296110918-17">{</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="5296110918-17">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">pro[·...·truncated·by·diffoscope;·len:·269,·SHA:·d5dde8ee3427f8536b511c8aa5bbe30c71264c2766b5e88c60f96b1495b555fd·...·]-18">)</span><span·class="p">,</span><span·class="w">
268 ····</span><span·class="p"·data-group-id="7859050100-19">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Handle</span><span·class="p"·data-group-id="7859050100-19">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">allocate_re[·...·truncated·by·diffoscope;·len:·219,·SHA:·2111807474b848171f31f6691fcb5a13ac28032b7514594de52aced713b6e371·...·]-20">)</span><span·class="p">,</span><span·class="w">268 ····</span><span·class="p"·data-group-id="5296110918-19">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Handle</span><span·class="p"·data-group-id="5296110918-19">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">allocate_re[·...·truncated·by·diffoscope;·len:·219,·SHA:·b06e221c9c3de464d55ae79fcb906c19d126c5d13f9b39ff2578b20c9016dfd4·...·]-20">)</span><span·class="p">,</span><span·class="w">
269 ····</span><span·class="c1">%%·save·handle·for·deallocation·test</span><span·class="w">269 ····</span><span·class="c1">%%·save·handle·for·deallocation·test</span><span·class="w">
270 ····</span><span·class="n">NewConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7859050100-21">[</span><span·class="p"·data-group-id="7859050100-22">{</span><span·class="ss">handle</span><span·class="p">,</span><span·class="n">Handle</span><span·class="p"·data-group-id="7859050100-22">}</span><span·class="p"·data-group-id="7859050100-21">]</span><span·class="p">,</span><span·class="w">270 ····</span><span·class="n">NewConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5296110918-21">[</span><span·class="p"·data-group-id="5296110918-22">{</span><span·class="ss">handle</span><span·class="p">,</span><span·class="n">Handle</span><span·class="p"·data-group-id="5296110918-22">}</span><span·class="p"·data-group-id="5296110918-21">]</span><span·class="p">,</span><span·class="w">
271 ····</span><span·class="p"·data-group-id="7859050100-23">{</span><span·class="ss">save_config</span><span·class="p">,</span><span·class="n">NewConfig</span><span·class="p"·data-group-id="7859050100-23">}</span><span·class="p">.</span><span·class="w">271 ····</span><span·class="p"·data-group-id="5296110918-23">{</span><span·class="ss">save_config</span><span·class="p">,</span><span·class="n">NewConfig</span><span·class="p"·data-group-id="5296110918-23">}</span><span·class="p">.</span><span·class="w">
  
272 </span><span·class="nf">deallocate</span><span·class="p"·data-group-id="7859050100-24">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7859050100-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">272 </span><span·class="nf">deallocate</span><span·class="p"·data-group-id="5296110918-24">(</span><span·class="n">Config</span><span·class="p"·data-group-id="5296110918-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
273 ····</span><span·class="p"·data-group-id="7859050100-25">{</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="7859050100-25">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">pro[·...·truncated·by·diffoscope;·len:·269,·SHA:·970644d8abe4507a6f44532b80e636f530155daf45d03eda240c868be6ed0057·...·]-26">)</span><span·class="p">,</span><span·class="w">273 ····</span><span·class="p"·data-group-id="5296110918-25">{</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="n">SessionId</span><span·class="p"·data-group-id="5296110918-25">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">pro[·...·truncated·by·diffoscope;·len:·269,·SHA:·b8cab771229553a0c130e5d7fd27e62d8ed95fcbb56e231148c765466d602648·...·]-26">)</span><span·class="p">,</span><span·class="w">
274 ····</span><span·class="p"·data-group-id="7859050100-27">{</span><span·class="ss">allocate</span><span·class="p">,</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="7859050100-27">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">pr[·...·truncated·by·diffoscope;·len:·279,·SHA:·5a40533bb44fcb97888c0ac9d902e2648ab6e5e3cb8c2c064c2ae4bf676604e1·...·]-28">)</span><span·class="p">,</span><span·class="w">274 ····</span><span·class="p"·data-group-id="5296110918-27">{</span><span·class="ss">allocate</span><span·class="p">,</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="5296110918-27">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">pr[·...·truncated·by·diffoscope;·len:·279,·SHA:·f1ff5dede6f4e67ba726868f0bd6c902ad216a905a574b6818a4ab6f08c4ab2d·...·]-28">)</span><span·class="p">,</span><span·class="w">
275 ····</span><span·class="n">Handle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7859050100-29">(</span><span·class="ss">handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="7859050100-29">)</span><span·class="p">,</span><span·class="w">275 ····</span><span·class="n">Handle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="5296110918-29">(</span><span·class="ss">handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OldConfig</span><span·class="p"·data-group-id="5296110918-29">)</span><span·class="p">,</span><span·class="w">
276 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">deallocate_resource</span><span·class="p"·data-group-id="7859050100-30">(</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SessionId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handle</span><span·class="p"·data-group-id="7859050100-30">)</span><span·class="p">.</span></code></pre><p>To·save·<code·class="inline">Config</code>·data·from·a·test·case·that·is·to·be·skipped,·return·tuple276 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">deallocate_resource</span><span·class="p"·data-group-id="5296110918-30">(</span><span·class="n">ServerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SessionId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Handle</span><span·class="p"·data-group-id="5296110918-30">)</span><span·class="p">.</span></code></pre><p>To·save·<code·class="inline">Config</code>·data·from·a·test·case·that·is·to·be·skipped,·return·tuple
277 <code·class="inline">{skip_and_save,Reason,ConfigList}</code>.</p><p>The·result·is·that·the·test·case·is·skipped·with·<code·class="inline">Reason</code>·printed·to·the·log277 <code·class="inline">{skip_and_save,Reason,ConfigList}</code>.</p><p>The·result·is·that·the·test·case·is·skipped·with·<code·class="inline">Reason</code>·printed·to·the·log
278 file·(as·described·earlier)·and·<code·class="inline">ConfigList</code>·is·saved·for·the·next·test·case.278 file·(as·described·earlier)·and·<code·class="inline">ConfigList</code>·is·saved·for·the·next·test·case.
279 <code·class="inline">ConfigList</code>·can·be·read·using·<code·class="inline">proplists:get_value(saved_config,·Config)</code>,·as279 <code·class="inline">ConfigList</code>·can·be·read·using·<code·class="inline">proplists:get_value(saved_config,·Config)</code>,·as
280 described·earlier.·<code·class="inline">skip_and_save</code>·can·also·be·returned·from·<code·class="inline">init_per_suite</code>.280 described·earlier.·<code·class="inline">skip_and_save</code>·can·also·be·returned·from·<code·class="inline">init_per_suite</code>.
281 In·this·case,·the·saved·data·can·be·read·by·<code·class="inline">init_per_suite</code>·in·the·suite·that281 In·this·case,·the·saved·data·can·be·read·by·<code·class="inline">init_per_suite</code>·in·the·suite·that
282 follows.</p><h2·id="sequences"·class="section-heading">282 follows.</p><h2·id="sequences"·class="section-heading">
283 ··<a·href="#sequences"·class="hover-link">283 ··<a·href="#sequences"·class="hover-link">
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296 following·tests·are·not·to·be·executed.·Typically,·if·the·<code·class="inline">save_config</code>·facility296 following·tests·are·not·to·be·executed.·Typically,·if·the·<code·class="inline">save_config</code>·facility
297 is·used·and·a·test·case·that·is·expected·to·save·data·crashes,·the·following297 is·used·and·a·test·case·that·is·expected·to·save·data·crashes,·the·following
298 case·cannot·run.·<code·class="inline">Common·Test</code>·offers·a·way·to·declare·such·dependencies,·called298 case·cannot·run.·<code·class="inline">Common·Test</code>·offers·a·way·to·declare·such·dependencies,·called
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164 </h2>164 </h2>
165 <p>Event·handlers·can·be·installed·by·an·<code·class="inline">event_handler</code>·start·flag165 <p>Event·handlers·can·be·installed·by·an·<code·class="inline">event_handler</code>·start·flag
166 (<a·href="ct_run_cmd.html"><code·class="inline">ct_run</code></a>)·or·option·<a·href="ct.html#run_test/1"><code·class="inline">ct:run_test/1</code></a>,·where·the·argument166 (<a·href="ct_run_cmd.html"><code·class="inline">ct_run</code></a>)·or·option·<a·href="ct.html#run_test/1"><code·class="inline">ct:run_test/1</code></a>,·where·the·argument
167 specifies·the·names·of·one·or·more·event·handler·modules.</p><p><em>Example:</em></p><p><code·class="inline">$·ct_run·-suite·test/my_SUITE·-event_handler·handlers/my_evh1·handlers/my_evh2·-pa·$PWD/handlers</code></p><p>To·pass·start·arguments·to·the·event·handler·init·function,·use·option167 specifies·the·names·of·one·or·more·event·handler·modules.</p><p><em>Example:</em></p><p><code·class="inline">$·ct_run·-suite·test/my_SUITE·-event_handler·handlers/my_evh1·handlers/my_evh2·-pa·$PWD/handlers</code></p><p>To·pass·start·arguments·to·the·event·handler·init·function,·use·option
168 <code·class="inline">ct_run·-event_handler_init</code>·instead·of·<code·class="inline">-event_handler</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>All·event·handler·modules·must·have·<code·class="inline">gen_event</code>·behavior.·These·modules·must168 <code·class="inline">ct_run·-event_handler_init</code>·instead·of·<code·class="inline">-event_handler</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>All·event·handler·modules·must·have·<code·class="inline">gen_event</code>·behavior.·These·modules·must
169 be·precompiled·and·their·locations·must·be·added·explicitly·to·the·Erlang·code169 be·precompiled·and·their·locations·must·be·added·explicitly·to·the·Erlang·code
170 server·search·path·(as·in·the·previous·example).</p></section><p>An·event_handler·tuple·in·argument·<code·class="inline">Opts</code>·has·the·following·definition·(see170 server·search·path·(as·in·the·previous·example).</p></section><p>An·event_handler·tuple·in·argument·<code·class="inline">Opts</code>·has·the·following·definition·(see
171 <a·href="ct.html#run_test/1"><code·class="inline">ct:run_test/1</code></a>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9265788110-1">{</span><span·class="ss">event_handler</span><span·class="p">,</span><span·class="n">EventHandlers</span><span·class="p"·data-group-id="9265788110-1">}</span><span·class="w">171 <a·href="ct.html#run_test/1"><code·class="inline">ct:run_test/1</code></a>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4649885124-1">{</span><span·class="ss">event_handler</span><span·class="p">,</span><span·class="n">EventHandlers</span><span·class="p"·data-group-id="4649885124-1">}</span><span·class="w">
  
172 </span><span·class="n">EventHandlers</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">EH</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="9265788110-2">[</span><span·class="n">EH</span><span·class="p"·data-group-id="9265788110-2">]</span><span·class="w">172 </span><span·class="n">EventHandlers</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">EH</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="4649885124-2">[</span><span·class="n">EH</span><span·class="p"·data-group-id="4649885124-2">]</span><span·class="w">
173 </span><span·class="n">EH</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="9265788110-3">(</span><span·class="p"·data-group-id="9265788110-3">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="9265788110-4">{</span><span·class="nf">atom</span><span·class="p"·data-group-id="9265788110-5">(</span><span·class="p"·data-group-id="9265788110-5">)</span><span·class="p">,</span><span·class="n">InitArgs</span><span·class="p"·data-group-id="9265788110-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="9265788110-6">{</span><span·class="p"·data-group-id="9265788110-7">[</span><span·class="nf">atom</span><span·class="p"·data-group-id="9265788110-8">(</span><span·class="p"·data-group-id="9265788110-8">)</span><span·class="p"·data-group-id="9265788110-7">]</span><span·class="p">,</span><span·class="n">InitArgs</span><span·class="p"·data-group-id="9265788110-6">}</span><span·class="w"> 
174 </span><span·class="n">InitArgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9265788110-9">[</span><span·class="nf">term</span><span·class="p"·data-group-id="9265788110-10">(</span><span·class="p"·data-group-id="9265788110-10">)</span><span·class="p"·data-group-id="9265788110-9">]</span></code></pre><p>In·the·following·example,·two·event·handlers·for·the·<code·class="inline">my_SUITE</code>·test·are 
175 installed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">run_test</span><span·class="p"·data-group-id="2277246101-1">(</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·1273,·SHA:·170f911f2a316497df9434ea1e8a2d87c4efaf232bdb6d13f0c20f8a663a66be·...·]173 </span><span·class="n">EH</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="4649885124-3">(</span><span·class="p"·data-group-id="4649885124-3">)</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·838,·SHA:·5c1c440b26de3b1649e365ecc4d1e8ed17c68a3cc753446c472edf9635629bd2·...·]
 174 </span><span·class="n">InitArgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4649885124-9">[</span><span·class="nf">term</span><span·class="p"·data-group-id="4649885124-10">(</span><span·class="p"·data-group-id="4649885124-10">)</span><span·class="p"·data-group-id="4649885124-9">]</span></code></pre><p>In·the·following·example,·two·event·handlers·for·the·<code·class="inline">my_SUITE</code>·test·are
 175 installed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">run_test</span><span·class="p"·data-group-id="7080667012-1">(</span><span·class="p"·data-group-id="7080667012-2">[</span><span·class="p"·data-group-id="7080667012-3">{</span><span·class="ss">suite</span><span·class="p">,</span><span·class="s">&quot;test/my_SUITE&quot;</span><span·class="p"·data-group-id="7080667012-3">}</span><span·class="p">,</span><span·class="p"·data-group-id="7080667012-4">{</span><span·class="ss">event_handler</span><span·class="p">,</span><span·class="p"·data-group-id="7080667012-5">[</span><span·class="ss">my_evh1</span><span·class="p">,</span><span·class="p"·data-group-id="7080667012-6">{</span><span·class="ss">my_evh2</span><span·class="p">,</span><span·class="p"·data-group-id="7080667012-7">[</span><span·class="nf">node</span><span·class="p"·data-group-id="7080667012-8">(</span><span·class="p"·data-group-id="7080667012-8">)</span><span·class="p"·data-group-id="7080667012-7">]</span><span·class="p"·data-group-id="7080667012-6">}</span><span·class="p"·data-group-id="7080667012-5">]</span><span·class="p"·data-group-id="7080667012-4">}</span><span·class="p"·data-group-id="7080667012-2">]</span><span·class="p"·data-group-id="7080667012-1">)</span><span·class="p">.</span></code></pre><p>Event·handler·<code·class="inline">my_evh1</code>·is·started·with·<code·class="inline">[]</code>·as·argument·to·the·init·function.
176 Event·handler·<code·class="inline">my_evh2</code>·is·started·with·the·name·of·the·current·node·in·the·init176 Event·handler·<code·class="inline">my_evh2</code>·is·started·with·the·name·of·the·current·node·in·the·init
177 argument·list.</p><p>Event·handlers·can·also·be·plugged·in·using·one·of·the·following177 argument·list.</p><p>Event·handlers·can·also·be·plugged·in·using·one·of·the·following
178 <a·href="run_test_chapter.html#test_specifications">test·specification</a>·terms:</p><ul><li><code·class="inline">{event_handler,·EventHandlers}</code></li><li><code·class="inline">{event_handler,·EventHandlers,·InitArgs}</code></li><li><code·class="inline">{event_handler,·NodeRefs,·EventHandlers}</code></li><li><code·class="inline">{event_handler,·NodeRefs,·EventHandlers,·InitArgs}</code></li></ul><p><code·class="inline">EventHandlers</code>·is·a·list·of·module·names.·Before·a·test·session·starts,·the178 <a·href="run_test_chapter.html#test_specifications">test·specification</a>·terms:</p><ul><li><code·class="inline">{event_handler,·EventHandlers}</code></li><li><code·class="inline">{event_handler,·EventHandlers,·InitArgs}</code></li><li><code·class="inline">{event_handler,·NodeRefs,·EventHandlers}</code></li><li><code·class="inline">{event_handler,·NodeRefs,·EventHandlers,·InitArgs}</code></li></ul><p><code·class="inline">EventHandlers</code>·is·a·list·of·module·names.·Before·a·test·session·starts,·the
179 init·function·of·each·plugged·in·event·handler·is·called·(with·the·<code·class="inline">InitArgs</code>179 init·function·of·each·plugged·in·event·handler·is·called·(with·the·<code·class="inline">InitArgs</code>
180 list·as·argument·or·<code·class="inline">[]</code>·if·no·start·arguments·are·specified).</p><p>To·plug·in·a·handler·to·the·<code·class="inline">Common·Test</code>·Master·event·manager,·specify·<code·class="inline">master</code>180 list·as·argument·or·<code·class="inline">[]</code>·if·no·start·arguments·are·specified).</p><p>To·plug·in·a·handler·to·the·<code·class="inline">Common·Test</code>·Master·event·manager,·specify·<code·class="inline">master</code>
181 as·the·node·in·<code·class="inline">NodeRefs</code>.</p><p>To·be·able·to·match·on·events,·the·event·handler·module·must·include·the·header181 as·the·node·in·<code·class="inline">NodeRefs</code>.</p><p>To·be·able·to·match·on·events,·the·event·handler·module·must·include·the·header
182 file·<code·class="inline">ct_event.hrl</code>.·An·event·is·a·record·with·the·following·definition:</p><p><code·class="inline">#event{name,·node,·data}</code></p><ul><li><p><strong><code·class="inline">name</code></strong>·-·Label·(type)·of·the·event.</p></li><li><p><strong><code·class="inline">node</code></strong>·-·Name·of·the·node·that·the·event·originated·from·(only·relevant182 file·<code·class="inline">ct_event.hrl</code>.·An·event·is·a·record·with·the·following·definition:</p><p><code·class="inline">#event{name,·node,·data}</code></p><ul><li><p><strong><code·class="inline">name</code></strong>·-·Label·(type)·of·the·event.</p></li><li><p><strong><code·class="inline">node</code></strong>·-·Name·of·the·node·that·the·event·originated·from·(only·relevant
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320 ······<p·class="built-using">320 ······<p·class="built-using">
321 ········Built·using321 ········Built·using
322 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the322 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
323 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>323 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
324 ······</p>324 ······</p>
325 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>325 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
326 ····</footer>326 ····</footer>
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328 </main>328 </main>
329 </div>329 </div>
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127 <p><a·href=""·id="top"></a></p><h2·id="test-suite-example"·class="section-heading">127 <p><a·href=""·id="top"></a></p><h2·id="test-suite-example"·class="section-heading">
128 ··<a·href="#test-suite-example"·class="hover-link">128 ··<a·href="#test-suite-example"·class="hover-link">
129 ····<i·class="ri-link-m"·aria-hidden="true"></i>129 ····<i·class="ri-link-m"·aria-hidden="true"></i>
130 ··</a>130 ··</a>
131 ··<span·class="text">Test·Suite·Example</span>131 ··<span·class="text">Test·Suite·Example</span>
132 </h2>132 </h2>
133 <p>The·following·example·test·suite·shows·some·tests·of·a·database·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7683955196-1">(</span><span·class="ss">db_data_type_SUITE</span><span·class="p"·data-group-id="7683955196-1">)</span><span·class="p">.</span><span·class="w">133 <p>The·following·example·test·suite·shows·some·tests·of·a·database·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9977326408-1">(</span><span·class="ss">db_data_type_SUITE</span><span·class="p"·data-group-id="9977326408-1">)</span><span·class="p">.</span><span·class="w">
134 </span><span·class="w">134 </span><span·class="w">
135 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7683955196-2">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="7683955196-2">)</span><span·class="p">.</span><span·class="w">135 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9977326408-2">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="9977326408-2">)</span><span·class="p">.</span><span·class="w">
  
136 </span><span·class="c1">%%·Test·server·callbacks</span><span·class="w">136 </span><span·class="c1">%%·Test·server·callbacks</span><span·class="w">
137 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7683955196-3">(</span><span·class="p"·data-group-id="7683955196-4">[</span><span·class="ss">suite</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">137 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9977326408-3">(</span><span·class="p"·data-group-id="9977326408-4">[</span><span·class="ss">suite</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
138 ·········</span><span·class="ss">init_per_suite</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_per_suite</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">138 ·········</span><span·class="ss">init_per_suite</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_per_suite</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
139 ·········</span><span·class="ss">init_per_testcase</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_per_testcase</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="7683955196-4">]</span><span·class="p"·data-group-id="7683955196-3">)</span><span·class="p">.</span><span·class="w">139 ·········</span><span·class="ss">init_per_testcase</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_per_testcase</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="9977326408-4">]</span><span·class="p"·data-group-id="9977326408-3">)</span><span·class="p">.</span><span·class="w">
  
140 </span><span·class="c1">%%·Test·cases</span><span·class="w">140 </span><span·class="c1">%%·Test·cases</span><span·class="w">
141 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7683955196-5">(</span><span·class="p"·data-group-id="7683955196-6">[</span><span·class="ss">string</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">integer</span><span·class="p">/</span[·...·truncated·by·diffoscope;·len:·120,·SHA:·c505328d47dee446c37c5e84977cb0b163745ec0a101ebb177d2ac220e34c339·...·]-5">)</span><span·class="p">.</span><span·class="w">141 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9977326408-5">(</span><span·class="p"·data-group-id="9977326408-6">[</span><span·class="ss">string</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">integer</span><span·class="p">/</span[·...·truncated·by·diffoscope;·len:·120,·SHA:·acf4839890f331f75134ff18e893157e0582f15c1c0dbbd366fb1d37aec5df0a·...·]-5">)</span><span·class="p">.</span><span·class="w">
142 </span><span·class="w">142 </span><span·class="w">
143 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7683955196-7">(</span><span·class="n">CONNECT_STR</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;DSN=sqlserver;UID=alladin;PWD=sesame&quot;</span><span·class="p"·data-group-id="7683955196-7">)</span><span·class="p">.</span><span·class="w">143 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="9977326408-7">(</span><span·class="n">CONNECT_STR</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;DSN=sqlserver;UID=alladin;PWD=sesame&quot;</span><span·class="p"·data-group-id="9977326408-7">)</span><span·class="p">.</span><span·class="w">
  
144 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">144 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
145 </span><span·class="c1">%%·COMMON·TEST·CALLBACK·FUNCTIONS</span><span·class="w">145 </span><span·class="c1">%%·COMMON·TEST·CALLBACK·FUNCTIONS</span><span·class="w">
146 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">146 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
  
147 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">147 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
148 </span><span·class="c1">%%·Function:·suite()·-&gt;·Info</span><span·class="w">148 </span><span·class="c1">%%·Function:·suite()·-&gt;·Info</span><span·class="w">
149 </span><span·class="c1">%%</span><span·class="w">149 </span><span·class="c1">%%</span><span·class="w">
150 </span><span·class="c1">%%·Info·=·[tuple()]</span><span·class="w">150 </span><span·class="c1">%%·Info·=·[tuple()]</span><span·class="w">
151 </span><span·class="c1">%%···List·of·key/value·pairs.</span><span·class="w">151 </span><span·class="c1">%%···List·of·key/value·pairs.</span><span·class="w">
152 </span><span·class="c1">%%</span><span·class="w">152 </span><span·class="c1">%%</span><span·class="w">
153 </span><span·class="c1">%%·Description:·Returns·list·of·tuples·to·set·default·properties</span><span·class="w">153 </span><span·class="c1">%%·Description:·Returns·list·of·tuples·to·set·default·properties</span><span·class="w">
154 </span><span·class="c1">%%··············for·the·suite.</span><span·class="w">154 </span><span·class="c1">%%··············for·the·suite.</span><span·class="w">
155 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">155 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
156 </span><span·class="nf">suite</span><span·class="p"·data-group-id="7683955196-8">(</span><span·class="p"·data-group-id="7683955196-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">156 </span><span·class="nf">suite</span><span·class="p"·data-group-id="9977326408-8">(</span><span·class="p"·data-group-id="9977326408-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
157 ····</span><span·class="p"·data-group-id="7683955196-9">[</span><span·class="p"·data-group-id="7683955196-10">{</span><span·class="ss">timetrap</span><span·class="p">,</span><span·class="p"·data-group-id="7683955196-11">{</span><span·class="ss">minutes</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·159,·SHA:·3e085578b7b6a6bcbcd28f83c65701b104c36b4db134aa19716d2c3fd34ad42b·...·]-9">]</span><span·class="p">.</span><span·class="w">157 ····</span><span·class="p"·data-group-id="9977326408-9">[</span><span·class="p"·data-group-id="9977326408-10">{</span><span·class="ss">timetrap</span><span·class="p">,</span><span·class="p"·data-group-id="9977326408-11">{</span><span·class="ss">minutes</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·159,·SHA:·2d5f71e284e468d8e0db44d458313dbee28fb71caf924ea4325323c1bf4018ab·...·]-9">]</span><span·class="p">.</span><span·class="w">
  
158 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">158 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
159 </span><span·class="c1">%%·Function:·init_per_suite(Config0)·-&gt;·Config1</span><span·class="w">159 </span><span·class="c1">%%·Function:·init_per_suite(Config0)·-&gt;·Config1</span><span·class="w">
160 </span><span·class="c1">%%</span><span·class="w">160 </span><span·class="c1">%%</span><span·class="w">
161 </span><span·class="c1">%%·Config0·=·Config1·=·[tuple()]</span><span·class="w">161 </span><span·class="c1">%%·Config0·=·Config1·=·[tuple()]</span><span·class="w">
162 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">162 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">
163 </span><span·class="c1">%%</span><span·class="w">163 </span><span·class="c1">%%</span><span·class="w">
164 </span><span·class="c1">%%·Description:·Initialization·before·the·suite.</span><span·class="w">164 </span><span·class="c1">%%·Description:·Initialization·before·the·suite.</span><span·class="w">
165 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">165 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
166 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7683955196-12">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">166 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="9977326408-12">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
167 ····</span><span·class="p"·data-group-id="7683955196-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ref</span><span·class="p"·data-group-id="7683955196-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·383,·SHA:·67da6c4d46983ee00b9c7769083b2ae0448693c6df2de4c14a08c4ee71268ecc·...·]-14">)</span><span·class="p">,</span><span·class="w">167 ····</span><span·class="p"·data-group-id="9977326408-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ref</span><span·class="p"·data-group-id="9977326408-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·383,·SHA:·74744e767cb69e84a65d0b9a60f54d2fe7b277c68d09cad253728d30afe07247·...·]-14">)</span><span·class="p">,</span><span·class="w">
168 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db_lib</span><span·class="p">:</span><span·class="nf">unique_table_name</span><span·class="p"·data-group-id="7683955196-16">(</span><span·class="p"·data-group-id="7683955196-16">)</span><span·class="p">,</span><span·class="w">168 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db_lib</span><span·class="p">:</span><span·class="nf">unique_table_name</span><span·class="p"·data-group-id="9977326408-16">(</span><span·class="p"·data-group-id="9977326408-16">)</span><span·class="p">,</span><span·class="w">
169 ····</span><span·class="p"·data-group-id="7683955196-17">[</span><span·class="p"·data-group-id="7683955196-18">{</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ref</span><span·class="w">·</span><span·class="p"·data-group-id="7683955196-18">}</s[·...·truncated·by·diffoscope;·len:·368,·SHA:·7c283f5ebdab32bfaed172408ec3c6e75bb7d01e74ef64cf9a73afd441128827·...·]-17">]</span><span·class="p">.</span><span·class="w">169 ····</span><span·class="p"·data-group-id="9977326408-17">[</span><span·class="p"·data-group-id="9977326408-18">{</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ref</span><span·class="w">·</span><span·class="p"·data-group-id="9977326408-18">}</s[·...·truncated·by·diffoscope;·len:·368,·SHA:·d8b77f80a576130c3fbd67797be77796a1274952dabb05d3ab0a1364765caa75·...·]-17">]</span><span·class="p">.</span><span·class="w">
  
170 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">170 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
171 </span><span·class="c1">%%·Function:·end_per_suite(Config)·-&gt;·term()</span><span·class="w">171 </span><span·class="c1">%%·Function:·end_per_suite(Config)·-&gt;·term()</span><span·class="w">
172 </span><span·class="c1">%%</span><span·class="w">172 </span><span·class="c1">%%</span><span·class="w">
173 </span><span·class="c1">%%·Config·=·[tuple()]</span><span·class="w">173 </span><span·class="c1">%%·Config·=·[tuple()]</span><span·class="w">
174 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">174 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">
175 </span><span·class="c1">%%</span><span·class="w">175 </span><span·class="c1">%%</span><span·class="w">
176 </span><span·class="c1">%%·Description:·Cleanup·after·the·suite.</span><span·class="w">176 </span><span·class="c1">%%·Description:·Cleanup·after·the·suite.</span><span·class="w">
177 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">177 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
178 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="7683955196-20">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="9977326408-20">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-21">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-21">)</span><span·class="p">,</span><span·class="w">179 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-21">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-21">)</span><span·class="p">,</span><span·class="w">
180 ····</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="7683955196-22">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="7683955196-22">)</span><span·class="p">,</span><span·class="w">180 ····</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="9977326408-22">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="9977326408-22">)</span><span·class="p">,</span><span·class="w">
181 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">181 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
182 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">182 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
183 </span><span·class="c1">%%·Function:·init_per_testcase(TestCase,·Config0)·-&gt;·Config1</span><span·class="w">183 </span><span·class="c1">%%·Function:·init_per_testcase(TestCase,·Config0)·-&gt;·Config1</span><span·class="w">
184 </span><span·class="c1">%%</span><span·class="w">184 </span><span·class="c1">%%</span><span·class="w">
185 </span><span·class="c1">%%·TestCase·=·atom()</span><span·class="w">185 </span><span·class="c1">%%·TestCase·=·atom()</span><span·class="w">
186 </span><span·class="c1">%%···Name·of·the·test·case·that·is·about·to·run.</span><span·class="w">186 </span><span·class="c1">%%···Name·of·the·test·case·that·is·about·to·run.</span><span·class="w">
187 </span><span·class="c1">%%·Config0·=·Config1·=·[tuple()]</span><span·class="w">187 </span><span·class="c1">%%·Config0·=·Config1·=·[tuple()]</span><span·class="w">
188 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">188 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">
189 </span><span·class="c1">%%</span><span·class="w">189 </span><span·class="c1">%%</span><span·class="w">
190 </span><span·class="c1">%%·Description:·Initialization·before·each·test·case.</span><span·class="w">190 </span><span·class="c1">%%·Description:·Initialization·before·each·test·case.</span><span·class="w">
191 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">191 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
192 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="7683955196-23">(</span><span·class="n">Case</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 </span><span·class="nf">init_per_testcase</span><span·class="p"·data-group-id="9977326408-23">(</span><span·class="n">Case</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-24">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-24">)</span><span·class="p">,</span><span·class="w">193 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-24">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-24">)</span><span·class="p">,</span><span·class="w">
194 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-25">(</span><span·class="ss">table_name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-25">)</span><span·class="p">,</span><span·class="w">194 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-25">(</span><span·class="ss">table_name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-25">)</span><span·class="p">,</span><span·class="w">
195 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7683955196-26">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TableName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">table_type</span><span·class="p"·data-group-id="7683955196-27"[·...·truncated·by·diffoscope;·len:·131,·SHA:·a6900ad8b41e56e428613ee3ae3e1004e62786d08520863471f93c7a76c6fd37·...·]-26">)</span><span·class="p">,</span><span·class="w">195 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="9977326408-26">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TableName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">table_type</span><span·class="p"·data-group-id="9977326408-27"[·...·truncated·by·diffoscope;·len:·131,·SHA:·d11a18485cf9852a1d97e13e36535c4dd2e602b7e0074e48314ccfa8d47f02fe·...·]-26">)</span><span·class="p">,</span><span·class="w">
196 ····</span><span·class="n">Config</span><span·class="p">.</span><span·class="w">196 ····</span><span·class="n">Config</span><span·class="p">.</span><span·class="w">
  
197 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">197 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
198 </span><span·class="c1">%%·Function:·end_per_testcase(TestCase,·Config)·-&gt;·term()</span><span·class="w">198 </span><span·class="c1">%%·Function:·end_per_testcase(TestCase,·Config)·-&gt;·term()</span><span·class="w">
199 </span><span·class="c1">%%</span><span·class="w">199 </span><span·class="c1">%%</span><span·class="w">
200 </span><span·class="c1">%%·TestCase·=·atom()</span><span·class="w">200 </span><span·class="c1">%%·TestCase·=·atom()</span><span·class="w">
201 </span><span·class="c1">%%···Name·of·the·test·case·that·is·finished.</span><span·class="w">201 </span><span·class="c1">%%···Name·of·the·test·case·that·is·finished.</span><span·class="w">
202 </span><span·class="c1">%%·Config·=·[tuple()]</span><span·class="w">202 </span><span·class="c1">%%·Config·=·[tuple()]</span><span·class="w">
203 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">203 </span><span·class="c1">%%···A·list·of·key/value·pairs,·holding·the·test·case·configuration.</span><span·class="w">
204 </span><span·class="c1">%%</span><span·class="w">204 </span><span·class="c1">%%</span><span·class="w">
205 </span><span·class="c1">%%·Description:·Cleanup·after·each·test·case.</span><span·class="w">205 </span><span·class="c1">%%·Description:·Cleanup·after·each·test·case.</span><span·class="w">
206 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">206 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
207 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="7683955196-28">(</span><span·class="p">_</span><span·class="n">Case</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">207 </span><span·class="nf">end_per_testcase</span><span·class="p"·data-group-id="9977326408-28">(</span><span·class="p">_</span><span·class="n">Case</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
208 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-29">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-29">)</span><span·class="p">,</span><span·class="w">208 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-29">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-29">)</span><span·class="p">,</span><span·class="w">
209 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-30">(</span><span·class="ss">table_name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-30">)</span><span·class="p">,</span><span·class="w">209 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-30">(</span><span·class="ss">table_name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-30">)</span><span·class="p">,</span><span·class="w">
210 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">delete_table</span><span·class="p"·data-group-id="7683955196-31">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TableName</span><span·class="p"·data-group-id="7683955196-31">)</span><span·class="p">,</span><span·class="w">210 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">delete_table</span><span·class="p"·data-group-id="9977326408-31">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TableName</span><span·class="p"·data-group-id="9977326408-31">)</span><span·class="p">,</span><span·class="w">
211 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">211 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
212 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">212 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
213 </span><span·class="c1">%%·Function:·all()·-&gt;·GroupsAndTestCases</span><span·class="w">213 </span><span·class="c1">%%·Function:·all()·-&gt;·GroupsAndTestCases</span><span·class="w">
214 </span><span·class="c1">%%</span><span·class="w">214 </span><span·class="c1">%%</span><span·class="w">
215 </span><span·class="c1">%%·GroupsAndTestCases·=·[{group,GroupName}·|·TestCase]</span><span·class="w">215 </span><span·class="c1">%%·GroupsAndTestCases·=·[{group,GroupName}·|·TestCase]</span><span·class="w">
216 </span><span·class="c1">%%·GroupName·=·atom()</span><span·class="w">216 </span><span·class="c1">%%·GroupName·=·atom()</span><span·class="w">
217 </span><span·class="c1">%%···Name·of·a·test·case·group.</span><span·class="w">217 </span><span·class="c1">%%···Name·of·a·test·case·group.</span><span·class="w">
218 </span><span·class="c1">%%·TestCase·=·atom()</span><span·class="w">218 </span><span·class="c1">%%·TestCase·=·atom()</span><span·class="w">
219 </span><span·class="c1">%%···Name·of·a·test·case.</span><span·class="w">219 </span><span·class="c1">%%···Name·of·a·test·case.</span><span·class="w">
220 </span><span·class="c1">%%</span><span·class="w">220 </span><span·class="c1">%%</span><span·class="w">
221 </span><span·class="c1">%%·Description:·Returns·the·list·of·groups·and·test·cases·that</span><span·class="w">221 </span><span·class="c1">%%·Description:·Returns·the·list·of·groups·and·test·cases·that</span><span·class="w">
222 </span><span·class="c1">%%··············are·to·be·executed.</span><span·class="w">222 </span><span·class="c1">%%··············are·to·be·executed.</span><span·class="w">
223 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">223 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
224 </span><span·class="nf">all</span><span·class="p"·data-group-id="7683955196-32">(</span><span·class="p"·data-group-id="7683955196-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 </span><span·class="nf">all</span><span·class="p"·data-group-id="9977326408-32">(</span><span·class="p"·data-group-id="9977326408-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 ····</span><span·class="p"·data-group-id="7683955196-33">[</span><span·class="ss">string</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">integer</span><span·class="p"·data-group-id="7683955196-33">]</span><span·class="p">.</span><span·class="w">225 ····</span><span·class="p"·data-group-id="9977326408-33">[</span><span·class="ss">string</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">integer</span><span·class="p"·data-group-id="9977326408-33">]</span><span·class="p">.</span><span·class="w">
  
  
226 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">226 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
227 </span><span·class="c1">%%·TEST·CASES</span><span·class="w">227 </span><span·class="c1">%%·TEST·CASES</span><span·class="w">
228 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">228 </span><span·class="c1">%%--------------------------------------------------------------------</span><span·class="w">
  
229 </span><span·class="nf">string</span><span·class="p"·data-group-id="7683955196-34">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">229 </span><span·class="nf">string</span><span·class="p"·data-group-id="9977326408-34">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
230 ····</span><span·class="nf">insert_and_lookup</span><span·class="p"·data-group-id="7683955196-35">(</span><span·class="ss">dummy_key</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Dummy·string&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·d411ced0acc47025ef69062e11d9df049cbb2f1efbd3939b865a6e3e00cfd010·...·]-35">)</span><span·class="p">.</span><span·class="w">230 ····</span><span·class="nf">insert_and_lookup</span><span·class="p"·data-group-id="9977326408-35">(</span><span·class="ss">dummy_key</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Dummy·string&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·d3f0b0b8509fcdca7d51da9845074b3ce56a6835558fd804d2b2f358734960ea·...·]-35">)</span><span·class="p">.</span><span·class="w">
  
231 </span><span·class="nf">integer</span><span·class="p"·data-group-id="7683955196-36">(</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-36">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 </span><span·class="nf">integer</span><span·class="p"·data-group-id="9977326408-36">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-36">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ····</span><span·class="nf">insert_and_lookup</span><span·class="p"·data-group-id="7683955196-37">(</span><span·class="ss">dummy_key</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-37">)</span><span·class="p">.</span><span·class="w">232 ····</span><span·class="nf">insert_and_lookup</span><span·class="p"·data-group-id="9977326408-37">(</span><span·class="ss">dummy_key</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-37">)</span><span·class="p">.</span><span·class="w">
  
  
233 </span><span·class="nf">insert_and_lookup</span><span·class="p"·data-group-id="7683955196-38">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">233 </span><span·class="nf">insert_and_lookup</span><span·class="p"·data-group-id="9977326408-38">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
234 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-39">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-39">)</span><span·class="p">,</span><span·class="w">234 ····</span><span·class="n">Ref</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-39">(</span><span·class="ss">con_ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-39">)</span><span·class="p">,</span><span·class="w">
235 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="7683955196-40">(</span><span·class="ss">table_name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="7683955196-40">)</span><span·class="p">,</span><span·class="w">235 ····</span><span·class="n">TableName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9977326408-40">(</span><span·class="ss">table_name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9977326408-40">)</span><span·class="p">,</span><span·class="w">
236 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="7683955196-41">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TableName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·64,·SHA:·016d155ed72f448b568a9c771fcaafa71c45c722b9cff1e6c130e70fff708ccc·...·]-41">)</span><span·class="p">,</span><span·class="w">236 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="9977326408-41">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TableName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·64,·SHA:·28a0a531a1fb3ba20d37e63731dd16b7f29df49fc2a82cd19a8b16dad071ea4b·...·]-41">)</span><span·class="p">,</span><span·class="w">
237 ····</span><span·class="p"·data-group-id="7683955196-42">[</span><span·class="n">Value</span><span·class="p"·data-group-id="7683955196-42">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">lookup</span[·...·truncated·by·diffoscope;·len:·276,·SHA:·cb8f2435230edbd5155c254bd01e5257c9c7131e8b36aca4c16e720c14e59e4e·...·]-43">)</span><span·class="p">,</span><span·class="w">237 ····</span><span·class="p"·data-group-id="9977326408-42">[</span><span·class="n">Value</span><span·class="p"·data-group-id="9977326408-42">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">db</span><span·class="p">:</span><span·class="nf">lookup</span[·...·truncated·by·diffoscope;·len:·276,·SHA:·0eedb2fc01d63a56f8e9dcd8a945ca990ac2181cadd52e7ce7f50a21b86e88a7·...·]-43">)</span><span·class="p">,</span><span·class="w">
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165 ··</a>165 ··</a>
166 ··<span·class="text">A·Simple·Test·Suite</span>166 ··<span·class="text">A·Simple·Test·Suite</span>
167 </h2>167 </h2>
168 <p>As·shown·in·section·<a·href="basics_chapter.html#External_Interfaces">Common·Test·Basics</a>,168 <p>As·shown·in·section·<a·href="basics_chapter.html#External_Interfaces">Common·Test·Basics</a>,
169 the·test·suite·module·implements·<a·href="ct_suite.html">callback·functions</a>·(mandatory169 the·test·suite·module·implements·<a·href="ct_suite.html">callback·functions</a>·(mandatory
170 or·optional)·for·various·purposes,·for·example:</p><ul><li>Init/end·configuration·function·for·the·test·suite</li><li>Init/end·configuration·function·for·a·test·case</li><li>Init/end·configuration·function·for·a·test·case·group</li><li>Test·cases</li></ul><p>The·configuration·functions·are·optional.·The·following·example·is·a·test·suite170 or·optional)·for·various·purposes,·for·example:</p><ul><li>Init/end·configuration·function·for·the·test·suite</li><li>Init/end·configuration·function·for·a·test·case</li><li>Init/end·configuration·function·for·a·test·case·group</li><li>Test·cases</li></ul><p>The·configuration·functions·are·optional.·The·following·example·is·a·test·suite
171 without·configuration·functions,·including·one·simple·test·case,·to·check·that171 without·configuration·functions,·including·one·simple·test·case,·to·check·that
172 module·<code·class="inline">mymod</code>·exists·(that·is,·can·be·successfully·loaded·by·the·code·server):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6932172603-1">(</span><span·class="ss">my1st_SUITE</span><span·class="p"·data-group-id="6932172603-1">)</span><span·class="p">.</span><span·class="w">172 module·<code·class="inline">mymod</code>·exists·(that·is,·can·be·successfully·loaded·by·the·code·server):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2472509732-1">(</span><span·class="ss">my1st_SUITE</span><span·class="p"·data-group-id="2472509732-1">)</span><span·class="p">.</span><span·class="w">
173 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="6932172603-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="6932172603-2">)</span><span·class="p">.</span><span·class="w">173 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="2472509732-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="2472509732-2">)</span><span·class="p">.</span><span·class="w">
  
174 </span><span·class="nf">all</span><span·class="p"·data-group-id="6932172603-3">(</span><span·class="p"·data-group-id="6932172603-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">174 </span><span·class="nf">all</span><span·class="p"·data-group-id="2472509732-3">(</span><span·class="p"·data-group-id="2472509732-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
175 ····</span><span·class="p"·data-group-id="6932172603-4">[</span><span·class="ss">mod_exists</span><span·class="p"·data-group-id="6932172603-4">]</span><span·class="p">.</span><span·class="w">175 ····</span><span·class="p"·data-group-id="2472509732-4">[</span><span·class="ss">mod_exists</span><span·class="p"·data-group-id="2472509732-4">]</span><span·class="p">.</span><span·class="w">
  
176 </span><span·class="nf">mod_exists</span><span·class="p"·data-group-id="6932172603-5">(</span><span·class="p">_</span><span·class="p"·data-group-id="6932172603-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 </span><span·class="nf">mod_exists</span><span·class="p"·data-group-id="2472509732-5">(</span><span·class="p">_</span><span·class="p"·data-group-id="2472509732-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ····</span><span·class="p"·data-group-id="6932172603-6">{</span><span·class="ss">module</span><span·class="p">,</span><span·class="ss">mymod</span><span·class="p"·data-group-id="6932172603-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</spa[·...·truncated·by·diffoscope;·len:·182,·SHA:·13ac5446509a6efcb027b03a70eb489627cba80fb479b59ff44eb9f61c4469b1·...·]-7">)</span><span·class="p">.</span></code></pre><p>If·the·operation·fails,·a·bad·match·error·occurs·that·terminates·the·test·case.</p><h2·id="a-test-suite-with-configuration-functions"·class="section-heading">177 ····</span><span·class="p"·data-group-id="2472509732-6">{</span><span·class="ss">module</span><span·class="p">,</span><span·class="ss">mymod</span><span·class="p"·data-group-id="2472509732-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</spa[·...·truncated·by·diffoscope;·len:·182,·SHA:·214f8c3da9307e2df9016320b4defe85893e48d8ff551b8692ae8bfba7af3997·...·]-7">)</span><span·class="p">.</span></code></pre><p>If·the·operation·fails,·a·bad·match·error·occurs·that·terminates·the·test·case.</p><h2·id="a-test-suite-with-configuration-functions"·class="section-heading">
178 ··<a·href="#a-test-suite-with-configuration-functions"·class="hover-link">178 ··<a·href="#a-test-suite-with-configuration-functions"·class="hover-link">
179 ····<i·class="ri-link-m"·aria-hidden="true"></i>179 ····<i·class="ri-link-m"·aria-hidden="true"></i>
180 ··</a>180 ··</a>
181 ··<span·class="text">A·Test·Suite·with·Configuration·Functions</span>181 ··<span·class="text">A·Test·Suite·with·Configuration·Functions</span>
182 </h2>182 </h2>
183 <p>If·you·need·to·perform·configuration·operations·to·run·your·test,·you·can183 <p>If·you·need·to·perform·configuration·operations·to·run·your·test,·you·can
184 implement·configuration·functions·in·your·suite.·The·result·from·a·configuration184 implement·configuration·functions·in·your·suite.·The·result·from·a·configuration
185 function·is·configuration·data,·or·<code·class="inline">Config</code>.·This·is·a·list·of·key-value·tuples185 function·is·configuration·data,·or·<code·class="inline">Config</code>.·This·is·a·list·of·key-value·tuples
186 that·get·passed·from·the·configuration·function·to·the·test·cases·(possibly186 that·get·passed·from·the·configuration·function·to·the·test·cases·(possibly
187 through·configuration·functions·on·&quot;lower·level&quot;).·The·data·flow·looks·as187 through·configuration·functions·on·&quot;lower·level&quot;).·The·data·flow·looks·as
188 follows:</p><p><img·src="assets/config.gif"·alt="Configuration·Data·Flow·in·a·Suite"·title="Configuration·Data·Flow·in·a·Suite"/></p><p>The·following·example·shows·a·test·suite·that·uses·configuration·functions·to188 follows:</p><p><img·src="assets/config.gif"·alt="Configuration·Data·Flow·in·a·Suite"·title="Configuration·Data·Flow·in·a·Suite"/></p><p>The·following·example·shows·a·test·suite·that·uses·configuration·functions·to
189 open·and·close·a·log·file·for·the·test·cases·(an·operation·that·is·unnecessary189 open·and·close·a·log·file·for·the·test·cases·(an·operation·that·is·unnecessary
190 and·irrelevant·to·perform·by·each·test·case):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1896395583-1">(</span><span·class="ss">check_log_SUITE</span><span·class="p"·data-group-id="1896395583-1">)</span><span·class="p">.</span><span·class="w">190 and·irrelevant·to·perform·by·each·test·case):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7334350102-1">(</span><span·class="ss">check_log_SUITE</span><span·class="p"·data-group-id="7334350102-1">)</span><span·class="p">.</span><span·class="w">
191 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1896395583-2">(</span><span·class="p"·data-group-id="1896395583-3">[</span><span·class="ss">all</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init_per_suite</span><span·class="p">/</[·...·truncated·by·diffoscope;·len:·258,·SHA:·425916cff45b607ef3e0ef36d75cfe42aa87ccfe401b23cbf343bf51702f3c65·...·]-2">)</span><span·class="p">.</span><span·class="w">191 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7334350102-2">(</span><span·class="p"·data-group-id="7334350102-3">[</span><span·class="ss">all</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init_per_suite</span><span·class="p">/</[·...·truncated·by·diffoscope;·len:·258,·SHA:·6964963adbf2c9629df68262e42d0eeacdb85291d2893c1d9faa6da4e830e4eb·...·]-2">)</span><span·class="p">.</span><span·class="w">
192 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1896395583-4">(</span><span·class="p"·data-group-id="1896395583-5">[</span><span·class="ss">check_restart_result</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">check_no_errors</span><[·...·truncated·by·diffoscope;·len:·142,·SHA:·219fe6b61a9dc39bd52a24e8b85d055c6cc18fcd9ed930cac0a6391129686e4b·...·]-4">)</span><span·class="p">.</span><span·class="w">192 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7334350102-4">(</span><span·class="p"·data-group-id="7334350102-5">[</span><span·class="ss">check_restart_result</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">check_no_errors</span><[·...·truncated·by·diffoscope;·len:·142,·SHA:·be51a39d80afdecdf0a53292a90b13fc8d041123a2eebfd474641a50123345a1·...·]-4">)</span><span·class="p">.</span><span·class="w">
193 </span><span·class="w">193 </span><span·class="w">
194 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="1896395583-6">(</span><span·class="nf">value</span><span·class="p"·data-group-id="1896395583-7">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="n">Config</span><span·class="p"·data-group-id="1896395583-7">)</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·344,·SHA:·a2fd7479b71868b82693f0facd4eb4182a570066044dc934bdbc2ca8a12586e8·...·]-6">)</span><span·class="p">.</span><span·class="w">194 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7334350102-6">(</span><span·class="nf">value</span><span·class="p"·data-group-id="7334350102-7">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="n">Config</span><span·class="p"·data-group-id="7334350102-7">)</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·344,·SHA:·f2e5b4e8bf7f460f9a97398d6932479db57cb219f0d4733ba5017c825dbb1747·...·]-6">)</span><span·class="p">.</span><span·class="w">
  
195 </span><span·class="nf">all</span><span·class="p"·data-group-id="1896395583-9">(</span><span·class="p"·data-group-id="1896395583-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1896395583-10">[</span><span·class="ss">check_restart_result</span><span·c[·...·truncated·by·diffoscope;·len:·121,·SHA:·54be1abfb43664bfa4c41975be28012b42207a0ed8c9b8905a8e919fcbff8536·...·]-10">]</span><span·class="p">.</span><span·class="w">195 </span><span·class="nf">all</span><span·class="p"·data-group-id="7334350102-9">(</span><span·class="p"·data-group-id="7334350102-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7334350102-10">[</span><span·class="ss">check_restart_result</span><span·c[·...·truncated·by·diffoscope;·len:·121,·SHA:·23dcfabbe793a44d553292866c9d4f519bac00c770900c94f85b9d10d244c026·...·]-10">]</span><span·class="p">.</span><span·class="w">
  
196 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="1896395583-11">(</span><span·class="n">InitConfigData</span><span·class="p"·data-group-id="1896395583-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">196 </span><span·class="nf">init_per_suite</span><span·class="p"·data-group-id="7334350102-11">(</span><span·class="n">InitConfigData</span><span·class="p"·data-group-id="7334350102-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
197 ····</span><span·class="p"·data-group-id="1896395583-12">[</span><span·class="p"·data-group-id="1896395583-13">{</span><span·class="ss">logref</span><span·class="p">,</span><span·class="nf">open_log</span><span·class="p"·data-group-id="1896395583-14">(</span><span·class="p"·data-group-id="18963955[·...·truncated·by·diffoscope;·len:·219,·SHA:·be941d816aa3cbd5e26af0c535f0ec2af580c1155f59bccf6519013b558d4bff·...·]-12">]</span><span·class="p">.</span><span·class="w">197 ····</span><span·class="p"·data-group-id="7334350102-12">[</span><span·class="p"·data-group-id="7334350102-13">{</span><span·class="ss">logref</span><span·class="p">,</span><span·class="nf">open_log</span><span·class="p"·data-group-id="7334350102-14">(</span><span·class="p"·data-group-id="73343501[·...·truncated·by·diffoscope;·len:·219,·SHA:·3d4b37cc8c36fd4758db998e8dec05e3d1d3452fd4c0e35471d9c1bc6f9e82ef·...·]-12">]</span><span·class="p">.</span><span·class="w">
  
198 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="1896395583-15">(</span><span·class="n">ConfigData</span><span·class="p"·data-group-id="1896395583-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 </span><span·class="nf">end_per_suite</span><span·class="p"·data-group-id="7334350102-15">(</span><span·class="n">ConfigData</span><span·class="p"·data-group-id="7334350102-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ····</span><span·class="nf">close_log</span><span·class="p"·data-group-id="1896395583-16">(</span><span·class="o">?</span><span·class="nf">value</span><span·class="p"·data-group-id="1896395583-17">(</span><span·class="ss">logref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ConfigData</span><span·class="p"[·...·truncated·by·diffoscope;·len:·80,·SHA:·40bbcfb8487bd9d7e2b94a7f1c90bab10a95294790d589d92ca8cceae7e55617·...·]-16">)</span><span·class="p">.</span><span·class="w">199 ····</span><span·class="nf">close_log</span><span·class="p"·data-group-id="7334350102-16">(</span><span·class="o">?</span><span·class="nf">value</span><span·class="p"·data-group-id="7334350102-17">(</span><span·class="ss">logref</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ConfigData</span><span·class="p"[·...·truncated·by·diffoscope;·len:·80,·SHA:·e19d2ba612b95dbce78f1543119265f84bc786e300f75e7ce8a3d61dc1922d59·...·]-16">)</span><span·class="p">.</span><span·class="w">
  
200 </span><span·class="nf">check_restart_result</span><span·class="p"·data-group-id="1896395583-18">(</span><span·class="n">ConfigData</span><span·class="p"·data-group-id="1896395583-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">200 </span><span·class="nf">check_restart_result</span><span·class="p"·data-group-id="7334350102-18">(</span><span·class="n">ConfigData</span><span·class="p"·data-group-id="7334350102-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
201 ····</span><span·class="n">TestData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">read_log</span><span·class="p"·data-group-id="1896395583-19">(</span><span·class="ss">restart</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="nf">value</span><span·class="p"·data-group-id="1896395583-20">(</span><span·class="ss">logref</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·159,·SHA:·54dfba5b0133569496ecc87ca24cfe993228a92020b3786b8c847c48979232f0·...·]-19">)</span><span·class="p">,</span><span·class="w">201 ····</span><span·class="n">TestData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">read_log</span><span·class="p"·data-group-id="7334350102-19">(</span><span·class="ss">restart</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="nf">value</span><span·class="p"·data-group-id="7334350102-20">(</span><span·class="ss">logref</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·159,·SHA:·bbf09911b0ece10f1086ececf5f5c7bc3921e14d249404515ec04cf755d105fc·...·]-19">)</span><span·class="p">,</span><span·class="w">
202 ····</span><span·class="p"·data-group-id="1896395583-21">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Line</span><span·class="p"·data-group-id="1896395583-21">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·258,·SHA:·bc61ea35878db1e2952081ef0055920b13db29fb0778d96064d267dc91fcbf63·...·]-22">)</span><span·class="p">.</span><span·class="w">202 ····</span><span·class="p"·data-group-id="7334350102-21">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p">_</span><span·class="n">Line</span><span·class="p"·data-group-id="7334350102-21">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·258,·SHA:·ab3ac21d2ae8b961d36713482d07c838453b643677d7b83d92c358ea5b17f90e·...·]-22">)</span><span·class="p">.</span><span·class="w">
  
203 </span><span·class="nf">check_no_errors</span><span·class="p"·data-group-id="1896395583-23">(</span><span·class="n">ConfigData</span><span·class="p"·data-group-id="1896395583-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">203 </span><span·class="nf">check_no_errors</span><span·class="p"·data-group-id="7334350102-23">(</span><span·class="n">ConfigData</span><span·class="p"·data-group-id="7334350102-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
204 ····</span><span·class="n">TestData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">read_log</span><span·class="p"·data-group-id="1896395583-24">(</span><span·class="ss">all</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="nf">value</span><span·class="p"·data-group-id="1896395583-25">(</span><span·class="ss">logref</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·155,·SHA:·9c39c7bfc833cf76814636409fcd87bb93652038914018154bdcf04b0853b49c·...·]-24">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="n">TestData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">read_log</span><span·class="p"·data-group-id="7334350102-24">(</span><span·class="ss">all</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="nf">value</span><span·class="p"·data-group-id="7334350102-25">(</span><span·class="ss">logref</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·155,·SHA:·d7224714fecd8eabd325526967d322a48e66a8bcf5c05f38e9bcc86cfd0fcc16·...·]-24">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">search_for</span><span·class="p"·data-group-id="1896395583-26">(</span><span·class="s">&quot;error&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TestData</span><span·class="p"·data-group-id="1896395583-26">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">205 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">search_for</span><span·class="p"·data-group-id="7334350102-26">(</span><span·class="s">&quot;error&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TestData</span><span·class="p"·data-group-id="7334350102-26">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
206 ········</span><span·class="p"·data-group-id="1896395583-27">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="n">Line</span><span·class="p"·data-group-id="1896395583-27">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">ct</sp[·...·truncated·by·diffoscope;·len:·351,·SHA:·209bdca3b40e1b6882a5cad88ba4e0d4c83878e439e16fe3bb090076ee39f85b·...·]-28">)</span><span·class="p">;</span><span·class="w">206 ········</span><span·class="p"·data-group-id="7334350102-27">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="n">Line</span><span·class="p"·data-group-id="7334350102-27">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">ct</sp[·...·truncated·by·diffoscope;·len:·351,·SHA:·9a466fb46691957f2720c7c1ab4e72f4c5ffa8ef15a13b40c31f130f6f651a3e·...·]-28">)</span><span·class="p">;</span><span·class="w">
207 ········</span><span·class="ss">nomatch</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">207 ········</span><span·class="ss">nomatch</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">
208 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·test·cases·verify,·by·parsing·a·log·file,·that·our·SUT·has·performed·a208 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·test·cases·verify,·by·parsing·a·log·file,·that·our·SUT·has·performed·a
209 successful·restart·and·that·no·unexpected·errors·are·printed.</p><p>To·execute·the·test·cases·in·the·recent·test·suite,·type·the·following·on·the209 successful·restart·and·that·no·unexpected·errors·are·printed.</p><p>To·execute·the·test·cases·in·the·recent·test·suite,·type·the·following·on·the
210 UNIX/Linux·command·line·(assuming·that·the·suite·module·is·in·the·current210 UNIX/Linux·command·line·(assuming·that·the·suite·module·is·in·the·current
211 working·directory):</p><pre><code·class="text">$·ct_run·-dir·.</code></pre><p>or:</p><pre><code·class="text">$·ct_run·-suite·check_log_SUITE</code></pre><p>To·use·the·Erlang·shell·to·run·our·test,·you·can·evaluate·the·following·call:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">run_test</span><span·class="p"·data-group-id="9311390625-1">(</span><span·class="p"·data-group-id="9311390625-2">[</span><span·class="p"·data-group-id="9311390625-3">{</span><span·class="ss">dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.&quot;</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·795,·SHA:·0c4debe4420a6bdd4156065afc4b44ee41eff05e4f690363da57c7b5ddc6bec1·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·result·from·running·the·test·is·printed·in·log·files·in·HTML·format·(stored211 working·directory):</p><pre><code·class="text">$·ct_run·-dir·.</code></pre><p>or:</p><pre><code·class="text">$·ct_run·-suite·check_log_SUITE</code></pre><p>To·use·the·Erlang·shell·to·run·our·test,·you·can·evaluate·the·following·call:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ct</span><span·class="p">:</span><span·class="nf">run_test</span><span·class="p"·data-group-id="6022298692-1">(</span><span·class="p"·data-group-id="6022298692-2">[</span><span·class="p"·data-group-id="6022298692-3">{</span><span·class="ss">dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.&quot;</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·795,·SHA:·e9841fce7eb3519e5f318b0502471853b5cf40c3a33b7ae00fa6f407858a7b9c·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·result·from·running·the·test·is·printed·in·log·files·in·HTML·format·(stored
212 in·unique·log·directories·on·a·different·level).·The·following·illustration212 in·unique·log·directories·on·a·different·level).·The·following·illustration
213 shows·the·log·file·structure:</p><p><img·src="assets/html_logs.gif"·alt="HTML·Log·File·Structure"·title="HTML·Log·File·Structure"/></p><h2·id="questions-and-answers"·class="section-heading">213 shows·the·log·file·structure:</p><p><img·src="assets/html_logs.gif"·alt="HTML·Log·File·Structure"·title="HTML·Log·File·Structure"/></p><h2·id="questions-and-answers"·class="section-heading">
214 ··<a·href="#questions-and-answers"·class="hover-link">214 ··<a·href="#questions-and-answers"·class="hover-link">
215 ····<i·class="ri-link-m"·aria-hidden="true"></i>215 ····<i·class="ri-link-m"·aria-hidden="true"></i>
216 ··</a>216 ··</a>
217 ··<span·class="text">Questions·and·Answers</span>217 ··<span·class="text">Questions·and·Answers</span>
218 </h2>218 </h2>
Offset 293, 15 lines modifiedOffset 293, 15 lines modified
293 ······<p·class="built-using">293 ······<p·class="built-using">
294 ········Built·using294 ········Built·using
295 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the295 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
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149 </main>149 </main>
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238 ····</footer>238 ····</footer>
239 ··</div>239 ··</div>
240 </main>240 </main>
241 </div>241 </div>
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125 ····<small·class="app-vsn"·translate="no">(common_test·v1.27.7)</small>125 ····<small·class="app-vsn"·translate="no">(common_test·v1.27.7)</small>
  
126 ··</h1>126 ··</h1>
  
  
127 ····<section·id="moduledoc">127 ····<section·id="moduledoc">
128 <p>Callback·module·for·<a·href="ct_telnet.html"><code·class="inline">ct_telnet</code></a>,·for·connecting·to·a·Telnet·server·on·a·UNIX128 <p>Callback·module·for·<a·href="ct_telnet.html"><code·class="inline">ct_telnet</code></a>,·for·connecting·to·a·Telnet·server·on·a·UNIX
129 host.</p><p>It·requires·the·following·entry·in·the·configuration·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2657306524-1">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="p"·data-group-id="2657306524-2">[</span><span·class="p"·data-group-id="2657306524-3">{</span><span·class="ss">telnet</span><span·class="p">,</span><span·class="n">HostNam[·...·truncated·by·diffoscope;·len:·60,·SHA:·9ec1f28435f6764b3b8d9aef6d94fd8cdbfdc46281657294b90f2948be34613b·...·]-3">}</span><span·class="p">,</span><span·class="w">129 host.</p><p>It·requires·the·following·entry·in·the·configuration·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2272952822-1">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="p"·data-group-id="2272952822-2">[</span><span·class="p"·data-group-id="2272952822-3">{</span><span·class="ss">telnet</span><span·class="p">,</span><span·class="n">HostNam[·...·truncated·by·diffoscope;·len:·60,·SHA:·266f94fca109189f3975f296ffe3d5d52fa2837783317262a731eaf067e9ed21·...·]-3">}</span><span·class="p">,</span><span·class="w">
130 ·······</span><span·class="p"·data-group-id="2657306524-4">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="n">PortNum</span><span·class="p"·data-group-id="2657306524-4">}</span><span·class="p">,</span><span·class="w">·················</span><span·class="c1">%·optional</span><span·class="w">130 ·······</span><span·class="p"·data-group-id="2272952822-4">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="n">PortNum</span><span·class="p"·data-group-id="2272952822-4">}</span><span·class="p">,</span><span·class="w">·················</span><span·class="c1">%·optional</span><span·class="w">
131 ·······</span><span·class="p"·data-group-id="2657306524-5">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="n">UserName</span><span·class="p"·data-group-id="2657306524-5">}</span><span·class="p">,</span><span·class="w">131 ·······</span><span·class="p"·data-group-id="2272952822-5">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="n">UserName</span><span·class="p"·data-group-id="2272952822-5">}</span><span·class="p">,</span><span·class="w">
132 ·······</span><span·class="p"·data-group-id="2657306524-6">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="2657306524-6">}</span><span·class="p">,</span><span·class="w"> 
133 ·······</span><span·class="p"·data-group-id="2657306524-7">{</span><span·class="ss">keep_alive</span><span·class="p">,</span><span·class="n">Bool</span><span·class="p"·data-group-id="2657306524-7">}</span><span·class="p"·data-group-id="2657306524-2">]</span><span·class="p"·data-group-id="2657306524-1"[·...·truncated·by·diffoscope;·len:·221,·SHA:·ddbe67da320d8da3704da6f4a01f7147fe06f5560a55f68ebbdc39c82ce2f96f·...·]132 ·······</span><span·class="p"·data-group-id="2272952822-6">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="2272952822-6">}</span><span·class="p">,</span><span·class="w">
 133 ·······</span><span·class="p"·data-group-id="2272952822-7">{</span><span·class="ss">keep_alive</span><span·class="p">,</span><span·class="n">Bool</span><span·class="p"·data-group-id="2272952822-7">}</span><span·class="p"·data-group-id="2272952822-2">]</span><span·class="p"·data-group-id="2272952822-1">}</span><span·class="p">.</span><span·class="w">············</span><span·class="c1">%·optional</span></code></pre><p>To·communicate·through·Telnet·to·the·host·specified·by·<code·class="inline">HostNameOrIpAddress</code>,
134 use·the·interface·functions·in·<a·href="ct_telnet.html"><code·class="inline">ct_telnet</code></a>,·for·example,·<code·class="inline">open(Name)</code>·and134 use·the·interface·functions·in·<a·href="ct_telnet.html"><code·class="inline">ct_telnet</code></a>,·for·example,·<code·class="inline">open(Name)</code>·and
135 <code·class="inline">cmd(Name,Cmd)</code>.</p><p><code·class="inline">Name</code>·is·the·name·you·allocated·to·the·Unix·host·in·your·<code·class="inline">require</code>·statement,135 <code·class="inline">cmd(Name,Cmd)</code>.</p><p><code·class="inline">Name</code>·is·the·name·you·allocated·to·the·Unix·host·in·your·<code·class="inline">require</code>·statement,
136 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="8226830790-1">(</span><span·class="p"·data-group-id="8226830790-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8226830790-2">[</span><span·class="p"·data-group-id="8226830790-3">{</span>[·...·truncated·by·diffoscope;·len:·1120,·SHA:·28103cb0fa0d6a1f9f56742c4a3acafa90245a1036f22d7bb41b98f0b7060bcf·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·&quot;keep·alive&quot;·activity·(that·is,·that·<code·class="inline">Common·Test</code>·sends·NOP·to·the·server136 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="8937249773-1">(</span><span·class="p"·data-group-id="8937249773-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8937249773-2">[</span><span·class="p"·data-group-id="8937249773-3">{</span>[·...·truncated·by·diffoscope;·len:·1120,·SHA:·add77d3d8ac66c2d2bf566758e5c9c5087fceb5bca1c0dccdb62cfe4dbde0fc2·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·&quot;keep·alive&quot;·activity·(that·is,·that·<code·class="inline">Common·Test</code>·sends·NOP·to·the·server
137 every·10·seconds·if·the·connection·is·idle)·can·be·enabled·or·disabled·for·one137 every·10·seconds·if·the·connection·is·idle)·can·be·enabled·or·disabled·for·one
138 particular·connection·as·described·here.·It·can·be·disabled·for·all·connections138 particular·connection·as·described·here.·It·can·be·disabled·for·all·connections
139 using·<code·class="inline">telnet_settings</code>·(see·<a·href="ct_telnet.html"><code·class="inline">ct_telnet</code></a>).</p><p>The·<code·class="inline">{port,PortNum}</code>·tuple·is·optional·and·if·omitted,·default·Telnet·port·23·is139 using·<code·class="inline">telnet_settings</code>·(see·<a·href="ct_telnet.html"><code·class="inline">ct_telnet</code></a>).</p><p>The·<code·class="inline">{port,PortNum}</code>·tuple·is·optional·and·if·omitted,·default·Telnet·port·23·is
140 used.·Also·the·<code·class="inline">keep_alive</code>·tuple·is·optional,·and·the·value·default·to·<code·class="inline">true</code>140 used.·Also·the·<code·class="inline">keep_alive</code>·tuple·is·optional,·and·the·value·default·to·<code·class="inline">true</code>
141 (enabled).</p><h2·id="module-see-also"·class="section-heading">141 (enabled).</p><h2·id="module-see-also"·class="section-heading">
142 ··<a·href="#module-see-also"·class="hover-link">142 ··<a·href="#module-see-also"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
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292 ······</p>292 ······</p>
293 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>293 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
294 ····</footer>294 ····</footer>
295 ··</div>295 ··</div>
296 </main>296 </main>
297 </div>297 </div>
298 <script>298 <script>
299 ··function·mermaidLoaded()·{299 ··function·mermaidLoaded()·{
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210 ······</p>210 ······</p>
211 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>211 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
212 ····</footer>212 ····</footer>
213 ··</div>213 ··</div>
214 </main>214 </main>
215 </div>215 </div>
216 <script>216 <script>
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262 <a·href="write_test_chapter.html#timetraps">Timetrap·Time-Outs</a>.</p></li><li><p><strong><code·class="inline">userdata</code></strong>·-·Specifies·any·data·related·to·the·test·case.·This·data·can·be262 <a·href="write_test_chapter.html#timetraps">Timetrap·Time-Outs</a>.</p></li><li><p><strong><code·class="inline">userdata</code></strong>·-·Specifies·any·data·related·to·the·test·case.·This·data·can·be
263 retrieved·at·any·time·using·the·<a·href="ct.html#userdata/3"><code·class="inline">ct:userdata/3</code></a>·utility·function.</p></li><li><p><strong><code·class="inline">silent_connections</code></strong>·-·For·details,·see·section263 retrieved·at·any·time·using·the·<a·href="ct.html#userdata/3"><code·class="inline">ct:userdata/3</code></a>·utility·function.</p></li><li><p><strong><code·class="inline">silent_connections</code></strong>·-·For·details,·see·section
264 <a·href="run_test_chapter.html#silent_connections">Silent·Connections</a>.</p></li><li><p><strong><code·class="inline">require</code></strong>·-·Specifies·configuration·variables·required·by·the·test·case.264 <a·href="run_test_chapter.html#silent_connections">Silent·Connections</a>.</p></li><li><p><strong><code·class="inline">require</code></strong>·-·Specifies·configuration·variables·required·by·the·test·case.
265 If·the·required·configuration·variables·are·not·found·in·any·of·the·test265 If·the·required·configuration·variables·are·not·found·in·any·of·the·test
266 system·configuration·files,·the·test·case·is·skipped.</p><p>A·required·variable·can·also·be·given·a·default·value·to·be·used·if·the266 system·configuration·files,·the·test·case·is·skipped.</p><p>A·required·variable·can·also·be·given·a·default·value·to·be·used·if·the
267 variable·is·not·found·in·any·configuration·file.·To·specify·a·default·value,267 variable·is·not·found·in·any·configuration·file.·To·specify·a·default·value,
268 add·a·tuple·on·the·form·<code·class="inline">{default_config,ConfigVariableName,Value}</code>·to·the268 add·a·tuple·on·the·form·<code·class="inline">{default_config,ConfigVariableName,Value}</code>·to·the
269 test·case·information·list·(the·position·in·the·list·is·irrelevant).</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">testcase1</span><span·class="p"·data-group-id="0571266834-1">(</span><span·class="p"·data-group-id="0571266834-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">269 test·case·information·list·(the·position·in·the·list·is·irrelevant).</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">testcase1</span><span·class="p"·data-group-id="7758296942-1">(</span><span·class="p"·data-group-id="7758296942-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
270 ····</span><span·class="p"·data-group-id="0571266834-2">[</span><span·class="p"·data-group-id="0571266834-3">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ftp</span><span·class="p"·data-group-id="0571266834-3">}</span><span·class="p">,</span><span·class="w">270 ····</span><span·class="p"·data-group-id="7758296942-2">[</span><span·class="p"·data-group-id="7758296942-3">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ftp</span><span·class="p"·data-group-id="7758296942-3">}</span><span·class="p">,</span><span·class="w">
271 ·····</span><span·class="p"·data-group-id="0571266834-4">{</span><span·class="ss">default_config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0571266834-5">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·195,·SHA:·c01a4e8da45965f73e445de7ef1fcb63daddc84ecf2a4df8ba8f170fbfad7dd0·...·]-6">}</span><span·class="p">,</span><span·class="w">271 ·····</span><span·class="p"·data-group-id="7758296942-4">{</span><span·class="ss">default_config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ftp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7758296942-5">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·195,·SHA:·6eb02e29ac20e25cd97bb0aecfca5db88adb1d6ebfe72208e204467a4c864160·...·]-6">}</span><span·class="p">,</span><span·class="w">
272 ····························</span><span·class="p"·data-group-id="0571266834-7">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;aladdin&quot;</span><span·class="p"·data-group-id="0571266834-7">}</span><span·class="p">,</span><span·class="w">272 ····························</span><span·class="p"·data-group-id="7758296942-7">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;aladdin&quot;</span><span·class="p"·data-group-id="7758296942-7">}</span><span·class="p">,</span><span·class="w">
273 ····························</span><span·class="p"·data-group-id="0571266834-8">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sesame&quot;</span><span·class="p"·data-group-id="0571266834-8">}</span><span·class="p"·data-group-id="0571266834-5">]</span><span·c[·...·truncated·by·diffoscope;·len:·335,·SHA:·f130b3c28d611a7c42251640e4607d69ddb81a0cd096e2a3105c9e5707350890·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">273 ····························</span><span·class="p"·data-group-id="7758296942-8">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sesame&quot;</span><span·class="p"·data-group-id="7758296942-8">}</span><span·class="p"·data-group-id="7758296942-5">]</span><span·c[·...·truncated·by·diffoscope;·len:·335,·SHA:·e2d4c1e6afe369729d6a50144e1389ca9de3a6bfe43e86cbf8b4533814a7022b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
274 ····</span><span·class="p"·data-group-id="3545137740-2">[</span><span·class="p"·data-group-id="3545137740-3">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">unix_telnet</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">un[·...·truncated·by·diffoscope;·len:·50,·SHA:·4cab33d77b3716d25bc31fe2a4db0c86d57d9a8bf4a8f332afede19893d44943·...·]-3">}</span><span·class="p">,</span><span·class="w">274 ····</span><span·class="p"·data-group-id="0449524001-2">[</span><span·class="p"·data-group-id="0449524001-3">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">unix_telnet</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">un[·...·truncated·by·diffoscope;·len:·50,·SHA:·7f69cfbd96cd991f7e556f379ac2a4d0503e365abb41e2c1ef1c5ed9477b5c00·...·]-3">}</span><span·class="p">,</span><span·class="w">
275 ·····</span><span·class="p"·data-group-id="3545137740-4">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3545137740-5">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·364,·SHA:·c081714b0c9d48353746a404150108b4e80fa2806d788f92db3cfa88c6320308·...·]-4">}</span><span·class="p">,</span><span·class="w">275 ·····</span><span·class="p"·data-group-id="0449524001-4">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0449524001-5">{</span><span·class="ss">unix</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·364,·SHA:·abe98beab7e274ac6b721ad76d21799402c107bdc1e01c4a2a20789a2b38623b·...·]-4">}</span><span·class="p">,</span><span·class="w">
276 ·····</span><span·class="p"·data-group-id="3545137740-7">{</span><span·class="ss">default_config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">unix</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3545137740-8">[</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·202,·SHA:·4b69a081940545c4a6b33f3bc6980b4f4dfbaad015386c17809754e621c72662·...·]-9">}</span><span·class="p">,</span><span·class="w">276 ·····</span><span·class="p"·data-group-id="0449524001-7">{</span><span·class="ss">default_config</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">unix</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0449524001-8">[</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·202,·SHA:·c5a9af8fb08e2335f1af1102d2820f1a439a8f0435de388e27617f75b6fba36e·...·]-9">}</span><span·class="p">,</span><span·class="w">
277 ·····························</span><span·class="p"·data-group-id="3545137740-10">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;aladdin&quot;</span><span·class="p"·data-group-id="3545137740-10">}</span><span·class="p">,</span><span·class="w">277 ·····························</span><span·class="p"·data-group-id="0449524001-10">{</span><span·class="ss">username</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;aladdin&quot;</span><span·class="p"·data-group-id="0449524001-10">}</span><span·class="p">,</span><span·class="w">
278 ·····························</span><span·class="p"·data-group-id="3545137740-11">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sesame&quot;</span><span·class="p"·data-group-id="3545137740-11">}</span><span·class="p"·data-group-id="3545137740-8">]</span><span[·...·truncated·by·diffoscope;·len:·113,·SHA:·163c93495ae8099a8bb472d11371e0bb91b11c09c9820c4a0a130223eab83930·...·]-2">]</span><span·class="p">.</span></code></pre></li></ul><p>For·more·information·about·<code·class="inline">require</code>,·see·section278 ·····························</span><span·class="p"·data-group-id="0449524001-11">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sesame&quot;</span><span·class="p"·data-group-id="0449524001-11">}</span><span·class="p"·data-group-id="0449524001-8">]</span><span[·...·truncated·by·diffoscope;·len:·113,·SHA:·d819848672bbce37f6bddf491255d856e3fdeb67e53e08d587779ab50994cc7d·...·]-2">]</span><span·class="p">.</span></code></pre></li></ul><p>For·more·information·about·<code·class="inline">require</code>,·see·section
279 <a·href="config_file_chapter.html#require_config_data">Requiring·and·Reading·Configuration·Data</a>279 <a·href="config_file_chapter.html#require_config_data">Requiring·and·Reading·Configuration·Data</a>
280 in·section·External·Configuration·Data·and·function280 in·section·External·Configuration·Data·and·function
281 <a·href="ct.html#require/1"><code·class="inline">ct:require/1/2</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Specifying·a·default·value·for·a·required·variable·can·result·in·a·test·case281 <a·href="ct.html#require/1"><code·class="inline">ct:require/1/2</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Specifying·a·default·value·for·a·required·variable·can·result·in·a·test·case
282 always·getting·executed.·This·might·not·be·a·desired·behavior.</p></section><p>If·<code·class="inline">timetrap</code>·or·<code·class="inline">require</code>,·or·both,·is·not·set·specifically·for·a·particular282 always·getting·executed.·This·might·not·be·a·desired·behavior.</p></section><p>If·<code·class="inline">timetrap</code>·or·<code·class="inline">require</code>,·or·both,·is·not·set·specifically·for·a·particular
283 test·case,·default·values·specified·by·function283 test·case,·default·values·specified·by·function
284 <a·href="ct_suite.html#c:suite/0"><code·class="inline">suite/0</code></a>·are·used.</p><p>Tags·other·than·the·earlier·mentioned·are·ignored·by·the·test·server.</p><p>An·example·of·a·test·case·information·function·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">reboot_node</span><span·class="p"·data-group-id="8768511034-1">(</span><span·class="p"·data-group-id="8768511034-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">284 <a·href="ct_suite.html#c:suite/0"><code·class="inline">suite/0</code></a>·are·used.</p><p>Tags·other·than·the·earlier·mentioned·are·ignored·by·the·test·server.</p><p>An·example·of·a·test·case·information·function·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">reboot_node</span><span·class="p"·data-group-id="9978048515-1">(</span><span·class="p"·data-group-id="9978048515-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
285 ····</span><span·class="p"·data-group-id="8768511034-2">[</span><span·class="w">285 ····</span><span·class="p"·data-group-id="9978048515-2">[</span><span·class="w">
286 ·····</span><span·class="p"·data-group-id="8768511034-3">{</span><span·class="ss">timetrap</span><span·class="p">,</span><span·class="p"·data-group-id="8768511034-4">{</span><span·class="ss">seconds</span><span·class="p">,</span><span·class="mi">60</span><span·class="p"·data-group-id="8768511034-4"[·...·truncated·by·diffoscope;·len:·50,·SHA:·2e8c2c5d3a5d54e4140b41b219ea66b5df8817a4ff38505ff1b341273758b6af·...·]-3">}</span><span·class="p">,</span><span·class="w">286 ·····</span><span·class="p"·data-group-id="9978048515-3">{</span><span·class="ss">timetrap</span><span·class="p">,</span><span·class="p"·data-group-id="9978048515-4">{</span><span·class="ss">seconds</span><span·class="p">,</span><span·class="mi">60</span><span·class="p"·data-group-id="9978048515-4"[·...·truncated·by·diffoscope;·len:·50,·SHA:·2b0c893f33961e4ddca1806a2fae0a816c9469928b8ed6ebf2e95858ac96f4eb·...·]-3">}</span><span·class="p">,</span><span·class="w">
287 ·····</span><span·class="p"·data-group-id="8768511034-5">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">interfaces</span><span·class="p"·data-group-id="8768511034-5">}</span><span·class="p">,</span><span·class="w">287 ·····</span><span·class="p"·data-group-id="9978048515-5">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">interfaces</span><span·class="p"·data-group-id="9978048515-5">}</span><span·class="p">,</span><span·class="w">
288 ·····</span><span·class="p"·data-group-id="8768511034-6">{</span><span·class="ss">userdata</span><span·class="p">,</span><span·class="w">288 ·····</span><span·class="p"·data-group-id="9978048515-6">{</span><span·class="ss">userdata</span><span·class="p">,</span><span·class="w">
289 ·········</span><span·class="p"·data-group-id="8768511034-7">[</span><span·class="p"·data-group-id="8768511034-8">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="s">&quot;System·Upgrade:·RpuAddition·Normal·RebootNode&quot;</span><span·class="p"·data-group-id="8768511034-8">}</span><span·class="p">,</span><span·class="w">289 ·········</span><span·class="p"·data-group-id="9978048515-7">[</span><span·class="p"·data-group-id="9978048515-8">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="s">&quot;System·Upgrade:·RpuAddition·Normal·RebootNode&quot;</span><span·class="p"·data-group-id="9978048515-8">}</span><span·class="p">,</span><span·class="w">
290 ··········</span><span·class="p"·data-group-id="8768511034-9">{</span><span·class="ss">fts</span><span·class="p">,</span><span·class="s">&quot;http://someserver.ericsson.se/test_doc4711.pdf&quot;</span><span·class="p"·data-group-id="8768511034-9">}</span><span·class="p"·data-group-id="8768511034-7">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·a868ec4760e8504b0e5479e79638e63cb92189f83f4cceb3bfb4c4cba9622a0e·...·]-6">}</span><span·class="w">290 ··········</span><span·class="p"·data-group-id="9978048515-9">{</span><span·class="ss">fts</span><span·class="p">,</span><span·class="s">&quot;http://someserver.ericsson.se/test_doc4711.pdf&quot;</span><span·class="p"·data-group-id="9978048515-9">}</span><span·class="p"·data-group-id="9978048515-7">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·ce8a7425ec8594ddc6788bbc25e3af306302ddf984ef806bdfcf43af3c0d0520·...·]-6">}</span><span·class="w">
291 ····</span><span·class="p"·data-group-id="8768511034-2">]</span><span·class="p">.</span></code></pre><p><a·href=""·id="suite"></a></p><h2·id="test-suite-information-function"·class="section-heading">291 ····</span><span·class="p"·data-group-id="9978048515-2">]</span><span·class="p">.</span></code></pre><p><a·href=""·id="suite"></a></p><h2·id="test-suite-information-function"·class="section-heading">
292 ··<a·href="#test-suite-information-function"·class="hover-link">292 ··<a·href="#test-suite-information-function"·class="hover-link">
293 ····<i·class="ri-link-m"·aria-hidden="true"></i>293 ····<i·class="ri-link-m"·aria-hidden="true"></i>
294 ··</a>294 ··</a>
295 ··<span·class="text">Test·Suite·Information·Function</span>295 ··<span·class="text">Test·Suite·Information·Function</span>
296 </h2>296 </h2>
297 <p>Function·<a·href="ct_suite.html#c:suite/0"><code·class="inline">suite/0</code></a>·can,·for·example,·be·used·in·a·test297 <p>Function·<a·href="ct_suite.html#c:suite/0"><code·class="inline">suite/0</code></a>·can,·for·example,·be·used·in·a·test
298 suite·module·to·set·a·default·<code·class="inline">timetrap</code>·value·and·to·<code·class="inline">require</code>·external298 suite·module·to·set·a·default·<code·class="inline">timetrap</code>·value·and·to·<code·class="inline">require</code>·external
299 configuration·data.·If·a·test·case,·or·a·group·information·function·also299 configuration·data.·If·a·test·case,·or·a·group·information·function·also
300 specifies·any·of·the·information·tags,·it·overrides·the·default·values·set·by300 specifies·any·of·the·information·tags,·it·overrides·the·default·values·set·by
301 <code·class="inline">suite/0</code>.·For·details,·see301 <code·class="inline">suite/0</code>.·For·details,·see
302 <a·href="write_test_chapter.html#info_function">Test·Case·Information·Function</a>·and302 <a·href="write_test_chapter.html#info_function">Test·Case·Information·Function</a>·and
303 <a·href="write_test_chapter.html#test_case_groups">Test·Case·Groups</a>.</p><p>The·following·options·can·also·be·specified·with·the·suite·information·list:</p><ul><li><code·class="inline">stylesheet</code>,·see·<a·href="run_test_chapter.html#html_stylesheet">HTML·Style·Sheets</a></li><li><code·class="inline">userdata</code>,·see303 <a·href="write_test_chapter.html#test_case_groups">Test·Case·Groups</a>.</p><p>The·following·options·can·also·be·specified·with·the·suite·information·list:</p><ul><li><code·class="inline">stylesheet</code>,·see·<a·href="run_test_chapter.html#html_stylesheet">HTML·Style·Sheets</a></li><li><code·class="inline">userdata</code>,·see
304 <a·href="write_test_chapter.html#info_function">Test·Case·Information·Function</a></li><li><code·class="inline">silent_connections</code>,·see304 <a·href="write_test_chapter.html#info_function">Test·Case·Information·Function</a></li><li><code·class="inline">silent_connections</code>,·see
305 <a·href="run_test_chapter.html#silent_connections">Silent·Connections</a></li></ul><p>An·example·of·the·suite·information·function·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="5881536353-1">(</span><span·class="p"·data-group-id="5881536353-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">305 <a·href="run_test_chapter.html#silent_connections">Silent·Connections</a></li></ul><p>An·example·of·the·suite·information·function·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">suite</span><span·class="p"·data-group-id="9085836376-1">(</span><span·class="p"·data-group-id="9085836376-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
306 ····</span><span·class="p"·data-group-id="5881536353-2">[</span><span·class="w">306 ····</span><span·class="p"·data-group-id="9085836376-2">[</span><span·class="w">
307 ·····</span><span·class="p"·data-group-id="5881536353-3">{</span><span·class="ss">timetrap</span><span·class="p">,</span><span·class="p"·data-group-id="5881536353-4">{</span><span·class="ss">minutes</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="5881536353-4"[·...·truncated·by·diffoscope;·len:·50,·SHA:·d146c3141ba4296ac67685f7e2922054718a2e65fcfe9aa1a33bf657feffec78·...·]-3">}</span><span·class="p">,</span><span·class="w">307 ·····</span><span·class="p"·data-group-id="9085836376-3">{</span><span·class="ss">timetrap</span><span·class="p">,</span><span·class="p"·data-group-id="9085836376-4">{</span><span·class="ss">minutes</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="9085836376-4"[·...·truncated·by·diffoscope;·len:·50,·SHA:·c26ffe0f1d17043fdcc5741a44270629973725e694e2fb1384de81c412cb9cbe·...·]-3">}</span><span·class="p">,</span><span·class="w">
308 ·····</span><span·class="p"·data-group-id="5881536353-5">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">global_names</span><span·class="p"·data-group-id="5881536353-5">}</span><span·class="p">,</span><span·class="w">308 ·····</span><span·class="p"·data-group-id="9085836376-5">{</span><span·class="ss">require</span><span·class="p">,</span><span·class="ss">global_names</span><span·class="p"·data-group-id="9085836376-5">}</span><span·class="p">,</span><span·class="w">
309 ·····</span><span·class="p"·data-group-id="5881536353-6">{</span><span·class="ss">userdata</span><span·class="p">,</span><span·class="p"·data-group-id="5881536353-7">[</span><span·class="p"·data-group-id="5881536353-8">{</span><span·class="ss">info</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·201,·SHA:·57d0b9c1c3d20130cbb900ad6ab010dcd0a71eec2aab4e91b8e6ffcae9041ab6·...·]-6">}</span><span·class="p">,</span><span·class="w">309 ·····</span><span·class="p"·data-group-id="9085836376-6">{</span><span·class="ss">userdata</span><span·class="p">,</span><span·class="p"·data-group-id="9085836376-7">[</span><span·class="p"·data-group-id="9085836376-8">{</span><span·class="ss">info</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·201,·SHA:·d27681a27c7665d33b3bd61da39dc8ae989883c6c5a6f74a9acf81e12c718bb2·...·]-6">}</span><span·class="p">,</span><span·class="w">
310 ·····</span><span·class="p"·data-group-id="5881536353-9">{</span><span·class="ss">silent_connections</span><span·class="p">,</span><span·class="p"·data-group-id="5881536353-10">[</span><span·class="ss">telnet</span><span·class="p"·data-group-id="5881536353-10">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·8502e1649c6a2e9e050aca9e47082ff3efc3d9da255009bafb54692f4eee8822·...·]-9">}</span><span·class="p">,</span><span·class="w">310 ·····</span><span·class="p"·data-group-id="9085836376-9">{</span><span·class="ss">silent_connections</span><span·class="p">,</span><span·class="p"·data-group-id="9085836376-10">[</span><span·class="ss">telnet</span><span·class="p"·data-group-id="9085836376-10">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·552dc48ff49170490a19929f6180ba185497f8618aed649c49026223c277ae92·...·]-9">}</span><span·class="p">,</span><span·class="w">
311 ·····</span><span·class="p"·data-group-id="5881536353-11">{</span><span·class="ss">stylesheet</span><span·class="p">,</span><span·class="s">&quot;db_testing.css&quot;</span><span·class="p"·data-group-id="5881536353-11">}</span><span·class="w">311 ·····</span><span·class="p"·data-group-id="9085836376-11">{</span><span·class="ss">stylesheet</span><span·class="p">,</span><span·class="s">&quot;db_testing.css&quot;</span><span·class="p"·data-group-id="9085836376-11">}</span><span·class="w">
312 ····</span><span·class="p"·data-group-id="5881536353-2">]</span><span·class="p">.</span></code></pre><p><a·href=""·id="test_case_groups"></a></p><h2·id="test-case-groups"·class="section-heading">312 ····</span><span·class="p"·data-group-id="9085836376-2">]</span><span·class="p">.</span></code></pre><p><a·href=""·id="test_case_groups"></a></p><h2·id="test-case-groups"·class="section-heading">
313 ··<a·href="#test-case-groups"·class="hover-link">313 ··<a·href="#test-case-groups"·class="hover-link">
314 ····<i·class="ri-link-m"·aria-hidden="true"></i>314 ····<i·class="ri-link-m"·aria-hidden="true"></i>
315 ··</a>315 ··</a>
316 ··<span·class="text">Test·Case·Groups</span>316 ··<span·class="text">Test·Case·Groups</span>
317 </h2>317 </h2>
318 <p>A·test·case·group·is·a·set·of·test·cases·sharing·configuration·functions·and318 <p>A·test·case·group·is·a·set·of·test·cases·sharing·configuration·functions·and
319 execution·properties.·Test·case·groups·are·defined·by·function319 execution·properties.·Test·case·groups·are·defined·by·function
Offset 327, 63 lines modifiedOffset 327, 63 lines modified
327 GroupName·=·atom()327 GroupName·=·atom()
328 GroupsAndTestCases·=·[GroupDef·|·{group,GroupName}·|·TestCase·|328 GroupsAndTestCases·=·[GroupDef·|·{group,GroupName}·|·TestCase·|
329 ·····················{testcase,TestCase,TCRepeatProps}]329 ·····················{testcase,TestCase,TCRepeatProps}]
330 TestCase·=·atom()330 TestCase·=·atom()
331 TCRepeatProps·=·[{repeat,N}·|·{repeat_until_ok,N}·|·{repeat_until_fail,N}]</code></pre><p><code·class="inline">GroupName</code>·is·the·name·of·the·group·and·must·be·unique·within·the·test·suite331 TCRepeatProps·=·[{repeat,N}·|·{repeat_until_ok,N}·|·{repeat_until_fail,N}]</code></pre><p><code·class="inline">GroupName</code>·is·the·name·of·the·group·and·must·be·unique·within·the·test·suite
332 module.·Groups·can·be·nested,·by·including·a·group·definition·within·the332 module.·Groups·can·be·nested,·by·including·a·group·definition·within·the
333 <code·class="inline">GroupsAndTestCases</code>·list·of·another·group.·<code·class="inline">Properties</code>·is·the·list·of333 <code·class="inline">GroupsAndTestCases</code>·list·of·another·group.·<code·class="inline">Properties</code>·is·the·list·of
334 execution·properties·for·the·group.·The·possible·values·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Properties</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3704534420-1">[</span><span·class="ss">parallel</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">sequence</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Shuffle</s[·...·truncated·by·diffoscope;·len:·309,·SHA:·181b5abc5dc3df9ff7d972b942f2bed82c6254254c31b4fd4baed590894b7d00·...·]-1">]</span><span·class="w">334 execution·properties·for·the·group.·The·possible·values·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Properties</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4399448658-1">[</span><span·class="ss">parallel</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">sequence</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Shuffle</s[·...·truncated·by·diffoscope;·len:·309,·SHA:·65e3e3ab50f38636e0da250a26220a335b48a8eb9dd0d91062add2a3c5726e43·...·]-1">]</span><span·class="w">
335 </span><span·class="n">Shuffle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">shuffle</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3704534420-3">{</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="n">Seed</span><span·class="p"·data-group-id="3704534420-3">}</span><span·class="w">335 </span><span·class="n">Shuffle</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">shuffle</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="4399448658-3">{</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="n">Seed</span><span·class="p"·data-group-id="4399448658-3">}</span><span·class="w">
336 </span><span·class="n">Seed</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3704534420-4">{</span><span·class="nf">integer</span><span·class="p"·data-group-id="3704534420-5">(</span><span·class="p"·data-group-id="3704534420-5">)</span><span·class="p">,</span><span·class="nf">integer</span><span·class="p"·data-group-id="3704534420-[·...·truncated·by·diffoscope;·len:·266,·SHA:·ae62a611b4d64637a5013aec6a8121f29467349d05de37cbfcf475895319e92b·...·]-4">}</span><span·class="w">336 </span><span·class="n">Seed</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4399448658-4">{</span><span·class="nf">integer</span><span·class="p"·data-group-id="4399448658-5">(</span><span·class="p"·data-group-id="4399448658-5">)</span><span·class="p">,</span><span·class="nf">integer</span><span·class="p"·data-group-id="4399448658-[·...·truncated·by·diffoscope;·len:·266,·SHA:·e5ff1211b5d3db5036e2e6e25d59fd9bedcf27f2812f9efcf385e0b485c0847f·...·]-4">}</span><span·class="w">
337 </span><span·class="n">GroupRepeatType</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">repeat</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">repeat_until_all_ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">repeat_until_all_fail</span><span·class="w">·</span><span·class="p">|</span><span·class="w">337 </span><span·class="n">GroupRepeatType</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">repeat</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">repeat_until_all_ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">repeat_until_all_fail</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
338 ··················</span><span·class="ss">repeat_until_any_ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">repeat_until_any_fail</span><span·class="w">338 ··················</span><span·class="ss">repeat_until_any_ok</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">repeat_until_any_fail</span><span·class="w">
339 </span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3704534420-8">(</span><span·class="p"·data-group-id="3704534420-8">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">forever</span></code></pre><p><em>Explanations:</em></p><ul><li><p><strong><code·class="inline">parallel</code></strong>·-·<code·class="inline">Common·Test</code>·executes·all·test·cases·in·the·group·in339 </span><span·class="n">N</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4399448658-8">(</span><span·class="p"·data-group-id="4399448658-8">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">forever</span></code></pre><p><em>Explanations:</em></p><ul><li><p><strong><code·class="inline">parallel</code></strong>·-·<code·class="inline">Common·Test</code>·executes·all·test·cases·in·the·group·in
340 parallel.</p></li><li><p><strong><code·class="inline">sequence</code></strong>·-·The·cases·are·executed·in·a·sequence·as·described·in·section340 parallel.</p></li><li><p><strong><code·class="inline">sequence</code></strong>·-·The·cases·are·executed·in·a·sequence·as·described·in·section
341 <a·href="dependencies_chapter.html#sequences">Sequences</a>·in·section·Dependencies·Between341 <a·href="dependencies_chapter.html#sequences">Sequences</a>·in·section·Dependencies·Between
342 Test·Cases·and·Suites.</p></li><li><p><strong><code·class="inline">shuffle</code></strong>·-·The·cases·in·the·group·are·executed·in·random·order.</p></li><li><p><strong><code·class="inline">repeat,·repeat_until_*</code></strong>·-·Orders·<code·class="inline">Common·Test</code>·to·repeat·execution·of·all342 Test·Cases·and·Suites.</p></li><li><p><strong><code·class="inline">shuffle</code></strong>·-·The·cases·in·the·group·are·executed·in·random·order.</p></li><li><p><strong><code·class="inline">repeat,·repeat_until_*</code></strong>·-·Orders·<code·class="inline">Common·Test</code>·to·repeat·execution·of·all
343 the·cases·in·the·group·a·given·number·of·times,·or·until·any,·or·all,·cases343 the·cases·in·the·group·a·given·number·of·times,·or·until·any,·or·all,·cases
344 fail·or·succeed.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">groups</span><span·class="p"·data-group-id="2146755268-1">(</span><span·class="p"·data-group-id="2146755268-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2146755268-2">[</span><span·class="p"·data-group-id="2146755268-3">{</span><span·class="ss">group1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2146755268-4">[</span><span·class="ss">parallel</span><span·class="p"·data-group-id="2146755268-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2146755268-5">[</span><span·class="ss">test1a</span><span·class="p">,</span><span·class="ss">test1b</span><span·class="p"·data-group-id="2146755268-5">]</span><span·class="p"·data-group-id="2146755268-3">}</span><span·class="p">,</span><span·class="w"> 
345 ·············</span><span·class="p"·data-group-id="2146755268-6">{</span><span·class="ss">group2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2146755268-7">[</span><span·class="ss">shuffle</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·604,·SHA:·bad05a418db2e5580061a038cdfc6550487d6b64ef448ba2dd6eec65fbbce6b2·...·]344 fail·or·succeed.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">groups</span><span·class="p"·data-group-id="1381279887-1">(</span><span·class="p"·data-group-id="1381279887-1">)</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·711,·SHA:·37ff35743b9a9c1295f3a615394c859b7ed1a9a1bfcfd702049cdb7e3578be08·...·]
 345 ·············</span><span·class="p"·data-group-id="1381279887-6">{</span><span·class="ss">group2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1381279887-7">[</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="ss">sequence</span><span·class="p"·data-group-id="1381279887-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1381279887-8">[</span><span·class="ss">test2a</span><span·class="p">,</span><span·class="ss">test2b</span><span·class="p">,</span><span·class="ss">test2c</span><span·class="p"·data-group-id="1381279887-8">]</span><span·class="p"·data-group-id="1381279887-6">}</span><span·class="p"·data-group-id="1381279887-2">]</span><span·class="p">.</span></code></pre><p>To·specify·in·which·order·groups·are·to·be·executed·(also·with·respect·to·test
346 cases·that·are·not·part·of·any·group),·add·tuples·on·the·form346 cases·that·are·not·part·of·any·group),·add·tuples·on·the·form
347 <code·class="inline">{group,GroupName}</code>·to·the·<code·class="inline">all/0</code>·list.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="1200607063-1">(</span><span·class="p"·data-group-id="1200607063-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1200607063-2">[</span><span·class="ss">testcase1</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·1055,·SHA:·f9a21d378023ca67b3e32f921ac1cb24802d9db6339697e9c5358df50b6e6b81·...·]-2">]</span><span·class="p">.</span></code></pre><p>Execution·properties·with·a·group·tuple·in·<code·class="inline">all/0</code>:347 <code·class="inline">{group,GroupName}</code>·to·the·<code·class="inline">all/0</code>·list.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="9002950760-1">(</span><span·class="p"·data-group-id="9002950760-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9002950760-2">[</span><span·class="ss">testcase1</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·1055,·SHA:·fa346b2b43d5a9644182098d2c2382d843cde3a112cd5107aca82fca4b0be9c0·...·]-2">]</span><span·class="p">.</span></code></pre><p>Execution·properties·with·a·group·tuple·in·<code·class="inline">all/0</code>:
348 <code·class="inline">{group,GroupName,Properties}</code>·can·also·be·specified.·These·properties·override348 <code·class="inline">{group,GroupName,Properties}</code>·can·also·be·specified.·These·properties·override
349 those·specified·in·the·group·definition·(see·<code·class="inline">groups/0</code>·earlier).·This·way,·the349 those·specified·in·the·group·definition·(see·<code·class="inline">groups/0</code>·earlier).·This·way,·the
350 same·set·of·tests·can·be·run,·but·with·different·properties,·without·having·to350 same·set·of·tests·can·be·run,·but·with·different·properties,·without·having·to
351 make·copies·of·the·group·definition·in·question.</p><p>If·a·group·contains·subgroups,·the·execution·properties·for·these·can·also·be351 make·copies·of·the·group·definition·in·question.</p><p>If·a·group·contains·subgroups,·the·execution·properties·for·these·can·also·be
352 specified·in·the·group·tuple:·<code·class="inline">{group,GroupName,Properties,SubGroups}</code>·Where,352 specified·in·the·group·tuple:·<code·class="inline">{group,GroupName,Properties,SubGroups}</code>·Where,
353 <code·class="inline">SubGroups</code>·is·a·list·of·tuples,·<code·class="inline">{GroupName,Properties}</code>·or353 <code·class="inline">SubGroups</code>·is·a·list·of·tuples,·<code·class="inline">{GroupName,Properties}</code>·or
354 <code·class="inline">{GroupName,Properties,SubGroups}</code>·representing·the·subgroups.·Any·subgroups354 <code·class="inline">{GroupName,Properties,SubGroups}</code>·representing·the·subgroups.·Any·subgroups
355 defined·in·<code·class="inline">groups/0</code>·for·a·group,·that·are·not·specified·in·the·<code·class="inline">SubGroups</code>355 defined·in·<code·class="inline">groups/0</code>·for·a·group,·that·are·not·specified·in·the·<code·class="inline">SubGroups</code>
356 list,·executes·with·their·predefined·properties.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">groups</span><span·class="p"·data-group-id="7179191979-1">(</span><span·class="p"·data-group-id="7179191979-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7179191979-2">[</span><span·class="p"·data-group-id="7179191979-3">{</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7179191979-4">[</span><span·class="p"·data-group-id="7179191979-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7179191979-5">[</span><span·class="p"·data-group-id="7179191979-6">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7179191979-7">[</span><span·class="p"·data-group-id="7179191979-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7179191979-8">[</span><span·class="ss">t2a</span><span·class="p">,</span><span·class="ss">t2b</span><span·class="p"·data-group-id="7179191979-8">]</span><span·class="p"·data-group-id="7179191979-6">}</span><span·class="p">,</span><span·class="w"> 
357 ··························</span><span·class="p"·data-group-id="7179191979-9">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7179191979-10">[</span><span·class="p"·data-group-id="7179191[·...·truncated·by·diffoscope;·len:·629,·SHA:·9b31a0910908a693ed8ce8d462a5949e1045adc48856fd5792d9b637b8fdd44c·...·]356 list,·executes·with·their·predefined·properties.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">groups</span><span·class="p"·data-group-id="2528039993-1">(</span><span·class="p"·data-group-id="2528039993-1">)</s[·...·truncated·by·diffoscope;·len:·1033,·SHA:·dbac11d9977f0b35eb4870f25655ed3e776a30368482836e960ace7c0e680a5a·...·]
 357 ··························</span><span·class="p"·data-group-id="2528039993-9">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2528039993-10">[</span><span·class="p"·data-group-id="2528039993-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2528039993-11">[</span><span·class="ss">t31</span><span·class="p">,</span><span·class="ss">t3b</span><span·class="p"·data-group-id="2528039993-11">]</span><span·class="p"·data-group-id="2528039993-9">}</span><span·class="p"·data-group-id="2528039993-5">]</span><span·class="p"·data-group-id="2528039993-3">}</span><span·class="p"·data-group-id="2528039993-2">]</span><span·class="p">.</span></code></pre><p>To·execute·group·<code·class="inline">tests1</code>·twice·with·different·properties·for·<code·class="inline">tests2</code>·each
358 time:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="6648806955-1">(</span><span·class="p"·data-group-id="6648806955-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">358 time:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="9845321696-1">(</span><span·class="p"·data-group-id="9845321696-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
359 ···</span><span·class="p"·data-group-id="6648806955-2">[</span><span·class="p"·data-group-id="6648806955-3">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6648806955-4">[</span><span·class="p"·data-group-id="6648806955-5">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6648806955-6">[</span><span·class="ss">parallel</span><span·class="p"·data-group-id="6648806955-6">]</span><span·class="p"·data-group-id="6648806955-5">}</span><span·class="p"·data-group-id="6648806955-4">]</span><span·class="p"·data-group-id="6648806955-3">}</span><span·class="p">,</span><span·class="w"> 
360 ····</span><span·class="p"·data-group-id="6648806955-7">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6648806955-8">[</span><span·class="p"·data-group-id="6648806955-9">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6648806955-10">[</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="p"·data-group-id="6648806955-11">{</span><span·class="ss">repeat</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="6648806955-11">}</span><span·class="p"·data-group-id="6648806955-10">]</span><span·class="p"·data-group-id="6648806955-9">}</span><span·class="p"·data-group-id="6648806955-8">]</span><span·class="p"·data-group-id="6648806955-7">}</span><span·class="p"·data-group-id="6648806955-2">]</span><span·class="p">.</span></code></pre><p>This·is·equivalent·to·the·following·specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="8248311853-1">(</span><span·class="p"·data-group-id="8248311853-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
361 ···</span><span·class="p"·data-group-id="8248311853-2">[</span><span·class="p"·data-group-id="8248311853-3">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</[·...·truncated·by·diffoscope;·len:·418,·SHA:·4fbda02c78cdefe9bb3d54a378a109b772341ef4eb9c99e8026787bb3db8e88b·...·]">}</span><span·class="p">,</span><span·class="w">359 ···</span><span·class="p"·data-group-id="9845321696-2">[</span><span·class="p"·data-group-id="9845321696-3">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</[·...·truncated·by·diffoscope;·len:·524,·SHA:·2b8ecf4e6fbdc1cab70bb4e1a70d5a3719a9ccf4a52a0bd149c1e1ec83baadc1·...·]">}</span><span·class="p">,</span><span·class="w">
 360 ····</span><span·class="p"·data-group-id="9845321696-7">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9845321696-8">[</span><span·class="p"·data-group-id="9845321696-9">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9845321696-10">[</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="p"·data-group-id="9845321696-11">{</span><span·class="ss">repeat</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="9845321696-11">}</span><span·class="p"·data-group-id="9845321696-10">]</span><span·class="p"·data-group-id="9845321696-9">}</span><span·class="p"·data-group-id="9845321696-8">]</span><span·class="p"·data-group-id="9845321696-7">}</span><span·class="p"·data-group-id="9845321696-2">]</span><span·class="p">.</span></code></pre><p>This·is·equivalent·to·the·following·specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="4201550722-1">(</span><span·class="p"·data-group-id="4201550722-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
 361 ···</span><span·class="p"·data-group-id="4201550722-2">[</span><span·class="p"·data-group-id="4201550722-3">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4201550722-4">[</span><span·class="p"·data-group-id="4201550722-5">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4201550722-6">[</span><span·class="ss">parallel</span><span·class="p"·data-group-id="4201550722-6">]</span><span·class="p"·data-group-id="4201550722-5">}</span><span·class="p">,</span><span·class="w">
362 ······························</span><span·class="p"·data-group-id="8248311853-7">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p"·data-group-id="8248311853-7">}</span><span·class="p"·data-group-id="8248311853-4">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·09c3b3a70cb642c6d2005b4a349161a3dd8db27c99fe116c96924ab63cb4696f·...·]-3">}</span><span·class="p">,</span><span·class="w">362 ······························</span><span·class="p"·data-group-id="4201550722-7">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p"·data-group-id="4201550722-7">}</span><span·class="p"·data-group-id="4201550722-4">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·235333afcb8aaccdc3cf9e6be93ac0044707dce29c93b5fb3abfc3b52c5415e0·...·]-3">}</span><span·class="p">,</span><span·class="w">
363 ····</span><span·class="p"·data-group-id="8248311853-8">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·577,·SHA:·03d66010acdf20bed68a303082c2f43ce3ef869ba611c6438a1258de3e3194f8·...·]-10">}</span><span·class="p">,</span><span·class="w">363 ····</span><span·class="p"·data-group-id="4201550722-8">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·577,·SHA:·7c0e406f1c71cdcf8a99b66ddbdbca4367f1f5b2e4b9f2db5de87ebca9f4d704·...·]-10">}</span><span·class="p">,</span><span·class="w">
364 ······························</span><span·class="p"·data-group-id="8248311853-13">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p"·data-group-id="8248311853-13">}</span><span·class="p"·data-group-id="8248311853-9">]</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·77,·SHA:·f13c6227308708340757e2a7552b9810bc5f67715b80901ce0a49b9bffea4e9e·...·]-2">]</span><span·class="p">.</span></code></pre><p>Value·<code·class="inline">default</code>·states·that·the·predefined·properties·are·to·be·used.</p><p>The·following·example·shows·how·to·override·properties·in·a·scenario·with·deeply364 ······························</span><span·class="p"·data-group-id="4201550722-13">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p"·data-group-id="4201550722-13">}</span><span·class="p"·data-group-id="4201550722-9">]</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·77,·SHA:·9cb4cd75aa8e166f447185673d11a4045d9bb8fc2bd638f6e3e1bffb5f06fe8c·...·]-2">]</span><span·class="p">.</span></code></pre><p>Value·<code·class="inline">default</code>·states·that·the·predefined·properties·are·to·be·used.</p><p>The·following·example·shows·how·to·override·properties·in·a·scenario·with·deeply
365 nested·groups:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">groups</span><span·class="p"·data-group-id="6285077975-1">(</span><span·class="p"·data-group-id="6285077975-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">365 nested·groups:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">groups</span><span·class="p"·data-group-id="2281227777-1">(</span><span·class="p"·data-group-id="2281227777-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
366 ···</span><span·class="p"·data-group-id="6285077975-2">[</span><span·class="p"·data-group-id="6285077975-3">{</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6285077975-4">[</span><span·class="p"·data-group-id="6285077975-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6285077975-5">[</span><span·class="p"·data-group-id="6285077975-6">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests2</span><span·class="p"·data-group-id="6285077975-6">}</span><span·class="p"·data-group-id="6285077975-5">]</span><span·class="p"·data-group-id="6285077975-3">}</span><span·class="p">,</span><span·class="w"> 
367 ····</span><span·class="p"·data-group-id="6285077975-7">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6285077975-8">[</span><span·class="p"·data-group-id="6285077975-8">]</span><span·class[·...·truncated·by·diffoscope;·len:·401,·SHA:·b04fc5dae665949fc668b11ed10ec4dbac77453f974e2ccca762ed77fe9739de·...·]">}</span><span·class="p">,</span><span·class="w">366 ···</span><span·class="p"·data-group-id="2281227777-2">[</span><span·class="p"·data-group-id="2281227777-3">{</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2281227777-4">[</span><span·class=[·...·truncated·by·diffoscope;·len:·451,·SHA:·0776e8c43a5464bc164ff7c80c7e21e627406417512de08244ca625c9b670aea·...·]">}</span><span·class="p">,</span><span·class="w">
 367 ····</span><span·class="p"·data-group-id="2281227777-7">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2281227777-8">[</span><span·class="p"·data-group-id="2281227777-8">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2281227777-9">[</span><span·class="p"·data-group-id="2281227777-10">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests3</span><span·class="p"·data-group-id="2281227777-10">}</span><span·class="p"·data-group-id="2281227777-9">]</span><span·class="p"·data-group-id="2281227777-7">}</span><span·class="p">,</span><span·class="w">
368 ····</span><span·class="p"·data-group-id="6285077975-11">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6285077975-12">[</span><span·class="p"·data-group-id="6285077975-13">{</span><span·class="ss">repeat</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·520,·SHA:·928a3b83c92d6766f7d03fb011f3e45b1c51d97454e2bb900518dc1528033543·...·]-2">]</span><span·class="p">.</span><span·class="w">368 ····</span><span·class="p"·data-group-id="2281227777-11">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2281227777-12">[</span><span·class="p"·data-group-id="2281227777-13">{</span><span·class="ss">repeat</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·520,·SHA:·1e9416915e04d3459401699886c5e4c74a02b98aabad1564c92a67e421eabcd9·...·]-2">]</span><span·class="p">.</span><span·class="w">
  
369 </span><span·class="nf">all</span><span·class="p"·data-group-id="6285077975-15">(</span><span·class="p"·data-group-id="6285077975-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">369 </span><span·class="nf">all</span><span·class="p"·data-group-id="2281227777-15">(</span><span·class="p"·data-group-id="2281227777-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
370 ···</span><span·class="p"·data-group-id="6285077975-16">[</span><span·class="p"·data-group-id="6285077975-17">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">370 ···</span><span·class="p"·data-group-id="2281227777-16">[</span><span·class="p"·data-group-id="2281227777-17">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">
371 ·····</span><span·class="p"·data-group-id="6285077975-18">[</span><span·class="p"·data-group-id="6285077975-19">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">371 ·····</span><span·class="p"·data-group-id="2281227777-18">[</span><span·class="p"·data-group-id="2281227777-19">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">
372 ·······</span><span·class="p"·data-group-id="6285077975-20">[</span><span·class="p"·data-group-id="6285077975-21">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6285077975-22">[</span><span·class="ss">parallel</span><span·class="p"[·...·truncated·by·diffoscope;·len:·563,·SHA:·20ba194934f2eb783be6cda6179957591625d74c908ec6f5eae67fcceaa8590f·...·]-16">]</span><span·class="p">.</span></code></pre><p>For·ease·of·readability,·all·syntax·definitions·can·be·replaced·by·a·function372 ·······</span><span·class="p"·data-group-id="2281227777-20">[</span><span·class="p"·data-group-id="2281227777-21">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2281227777-22">[</span><span·class="ss">parallel</span><span·class="p"[·...·truncated·by·diffoscope;·len:·563,·SHA:·388643345d3ac9efb22877525c615c5440e209fbd55f86f51951ca3af2d2e598·...·]-16">]</span><span·class="p">.</span></code></pre><p>For·ease·of·readability,·all·syntax·definitions·can·be·replaced·by·a·function
373 call·whose·return·value·should·match·the·expected·syntax·case.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="6791434350-1">(</span><span·class="p"·data-group-id="6791434350-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">373 call·whose·return·value·should·match·the·expected·syntax·case.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">all</span><span·class="p"·data-group-id="2280384024-1">(</span><span·class="p"·data-group-id="2280384024-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
374 ···</span><span·class="p"·data-group-id="6791434350-2">[</span><span·class="p"·data-group-id="6791434350-3">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</[·...·truncated·by·diffoscope;·len:·234,·SHA:·c6cf056531710d869ee784088e50a04982e7f0cdefd408817db2e10e93ac8e1f·...·]-3">}</span><span·class="p">,</span><span·class="w">374 ···</span><span·class="p"·data-group-id="2280384024-2">[</span><span·class="p"·data-group-id="2280384024-3">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</[·...·truncated·by·diffoscope;·len:·234,·SHA:·6b0029ee3fa46febc2cac6d93f748f2e200903234e01c248f2bb71394624619a·...·]-3">}</span><span·class="p">,</span><span·class="w">
375 ····</span><span·class="p"·data-group-id="6791434350-5">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·183,·SHA:·ad3eff7ec13d38241b4d5592047d541ce657e8a99f8ea8d3ed5506ccc71fd2f6·...·]-7">)</span><span·class="p">,</span><span·class="w">375 ····</span><span·class="p"·data-group-id="2280384024-5">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tests1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·183,·SHA:·71e2a5b44ad20ec0855a10812cb3c05ab7e9da2b07282594502c135f9e0ced15·...·]-7">)</span><span·class="p">,</span><span·class="w">
376 ······························</span><span·class="p"·data-group-id="6791434350-8">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p"·data-group-id="6791434350-8">}</span><span·class="p"·data-group-id="6791434350-6">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·75,·SHA:·6f5cfdc39fe2421105059def254ccd22bd3ecc40f07fe0b84c0e4c4a7bfd74b1·...·]-2">]</span><span·class="p">.</span><span·class="w">376 ······························</span><span·class="p"·data-group-id="2280384024-8">{</span><span·class="ss">tests3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p"·data-group-id="2280384024-8">}</span><span·class="p"·data-group-id="2280384024-6">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·75,·SHA:·8ce0c89d80e28d816932ea1c8a81a083310e983f6469db1b739bb9aae2060ac8·...·]-2">]</span><span·class="p">.</span><span·class="w">
377 </span><span·class="nf">test_cases</span><span·class="p"·data-group-id="6791434350-9">(</span><span·class="p"·data-group-id="6791434350-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">377 </span><span·class="nf">test_cases</span><span·class="p"·data-group-id="2280384024-9">(</span><span·class="p"·data-group-id="2280384024-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
378 ···</span><span·class="p"·data-group-id="6791434350-10">[</span><span·class="p"·data-group-id="6791434350-11">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6791434350-12">[</span><span·class="ss">parallel</span><span·class="p"[·...·truncated·by·diffoscope;·len:·399,·SHA:·2d2dbbfd97265a3f64b2e3d2dbe03c44b38bc5c3f7fd76fc93247315fc58c824·...·]-10">]</span><span·class="p">.</span><span·class="w">378 ···</span><span·class="p"·data-group-id="2280384024-10">[</span><span·class="p"·data-group-id="2280384024-11">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2280384024-12">[</span><span·class="ss">parallel</span><span·class="p"[·...·truncated·by·diffoscope;·len:·399,·SHA:·ccdc418405e32995a746dbdca98289ffb64f9bd8e6a470779813ea8c4c6ce151·...·]-10">]</span><span·class="p">.</span><span·class="w">
  
379 </span><span·class="nf">shuffle_test</span><span·class="p"·data-group-id="6791434350-14">(</span><span·class="p"·data-group-id="6791434350-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">379 </span><span·class="nf">shuffle_test</span><span·class="p"·data-group-id="2280384024-14">(</span><span·class="p"·data-group-id="2280384024-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
380 ···</span><span·class="p"·data-group-id="6791434350-15">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6791434350-16">[</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="p"·data-group-id="6791434350-17">[·...·truncated·by·diffoscope;·len:·237,·SHA:·a1757e807bcc6df39c4e8e8733c64eea5ad1cb4ca92222e019abfe0a049cd6d8·...·]-15">}</span><span·class="p">.</span></code></pre><p>The·described·syntax·can·also·be·used·in·test·specifications·to·change·group380 ···</span><span·class="p"·data-group-id="2280384024-15">{</span><span·class="ss">tests2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2280384024-16">[</span><span·class="ss">shuffle</span><span·class="p">,</span><span·class="p"·data-group-id="2280384024-17">[·...·truncated·by·diffoscope;·len:·237,·SHA:·e53cf8794e9d3d99a97f363f4a2a0567e109695df4dc36573c859543edc004df·...·]-15">}</span><span·class="p">.</span></code></pre><p>The·described·syntax·can·also·be·used·in·test·specifications·to·change·group
381 properties·at·the·time·of·execution,·without·having·to·edit·the·test·suite.·For381 properties·at·the·time·of·execution,·without·having·to·edit·the·test·suite.·For
382 more·information,·see·section382 more·information,·see·section
383 <a·href="run_test_chapter.html#test_specifications">Test·Specifications</a>·in·section383 <a·href="run_test_chapter.html#test_specifications">Test·Specifications</a>·in·section
384 Running·Tests·and·Analyzing·Results.</p><p>As·illustrated,·properties·can·be·combined.·If,·for·example,·<code·class="inline">shuffle</code>,384 Running·Tests·and·Analyzing·Results.</p><p>As·illustrated,·properties·can·be·combined.·If,·for·example,·<code·class="inline">shuffle</code>,
385 <code·class="inline">repeat_until_any_fail</code>,·and·<code·class="inline">sequence</code>·are·all·specified,·the·test·cases·in·the385 <code·class="inline">repeat_until_any_fail</code>,·and·<code·class="inline">sequence</code>·are·all·specified,·the·test·cases·in·the
386 group·are·executed·repeatedly,·and·in·random·order,·until·a·test·case·fails.386 group·are·executed·repeatedly,·and·in·random·order,·until·a·test·case·fails.
387 Then·execution·is·immediately·stopped·and·the·remaining·cases·are·skipped.</p><p>Before·execution·of·a·group·begins,·the·configuration·function387 Then·execution·is·immediately·stopped·and·the·remaining·cases·are·skipped.</p><p>Before·execution·of·a·group·begins,·the·configuration·function
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143 ······<p·class="built-using">143 ······<p·class="built-using">
144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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209 ········Built·using209 ········Built·using
210 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the210 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
211 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>211 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
212 ······</p>212 ······</p>
213 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>213 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
214 ····</footer>214 ····</footer>
215 ··</div>215 ··</div>
216 </main>216 </main>
217 </div>217 </div>
218 <script>218 <script>
219 ··function·mermaidLoaded()·{219 ··function·mermaidLoaded()·{
220 ····mermaid.initialize({220 ····mermaid.initialize({
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184 </span><span·class="nc">landing_pad_block</span><span·class="p">:</span><span·class="w">184 </span><span·class="nc">landing_pad_block</span><span·class="p">:</span><span·class="w">
185 ···</span><span·class="p">@</span><span·class="ss">aggregate</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">landingpad</span><span·class="w">·</span><span·class="k">catch</span><span·class="p">,</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">tag</span><span·class="w">185 ···</span><span·class="p">@</span><span·class="ss">aggregate</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">landingpad</span><span·class="w">·</span><span·class="k">catch</span><span·class="p">,</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">tag</span><span·class="w">
186 ···</span><span·class="p">@</span><span·class="ss">catched_val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">extract</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">ssa_agg</span><span·class="p">,</span><span·class="w">·</span><span·class="err">`</span><span·class="mi">0</span><span·class="err">`</span><span·class="w">186 ···</span><span·class="p">@</span><span·class="ss">catched_val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">extract</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">ssa_agg</span><span·class="p">,</span><span·class="w">·</span><span·class="err">`</span><span·class="mi">0</span><span·class="err">`</span><span·class="w">
187 ···</span><span·class="ss">br</span><span·class="w">·</span><span·class="err">^</span><span·class="ss">common_end_of_catch</span><span·class="w">187 ···</span><span·class="ss">br</span><span·class="w">·</span><span·class="err">^</span><span·class="ss">common_end_of_catch</span><span·class="w">
  
188 </span><span·class="nc">common_end_of_catch</span><span·class="p">:</span><span·class="w">188 </span><span·class="nc">common_end_of_catch</span><span·class="p">:</span><span·class="w">
189 ··</span><span·class="p">@</span><span·class="ss">tmp</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">phi</span><span·class="w">·</span><span·class="p"·data-group-id="2120879816-1">{</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">catched_val</span><span·class="p">,</span><span·class="w">·</span><span·class="err">^</span><span·class="ss">landing_pad_block</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·5f58a4596d7a5f668b02a48fcc3841dbb486030d5e844178b1ee72f2128896d0·...·]-1">}</span><span·class="p">,</span><span·class="w">189 ··</span><span·class="p">@</span><span·class="ss">tmp</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">phi</span><span·class="w">·</span><span·class="p"·data-group-id="2143523603-1">{</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">catched_val</span><span·class="p">,</span><span·class="w">·</span><span·class="err">^</span><span·class="ss">landing_pad_block</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·8008613b446aab428fd66a8f19d4f0d3fa664a6adeed52b227d6804ff2f5e4f0·...·]-1">}</span><span·class="p">,</span><span·class="w">
190 ·············</span><span·class="p"·data-group-id="2120879816-2">{</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">successful_result</span><span·class="p">,</span><span·class="w">·</span><span·class="err">^</span><span·class="ss">protected_blockN</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·32,·SHA:·4024ef4543fe78744890322fa30da2e791e6517ead74e2a62f5a6ab89dcdf21c·...·]-2">}</span><span·class="w">190 ·············</span><span·class="p"·data-group-id="2143523603-2">{</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">successful_result</span><span·class="p">,</span><span·class="w">·</span><span·class="err">^</span><span·class="ss">protected_blockN</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·32,·SHA:·c995e835f00e749681e5ad858bb35e1cf64b6d6b56a878408225e872902bbe44·...·]-2">}</span><span·class="w">
191 ··</span><span·class="p">@</span><span·class="ss">result_of_catch_expr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">catch_end</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">tag</span><span·class="p">,</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">tmp</span></code></pre><p>Just·as·for·a·<code·class="inline">try</code>-<code·class="inline">catch</code>·expression·all·code·that·can·cause·an191 ··</span><span·class="p">@</span><span·class="ss">result_of_catch_expr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">catch_end</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">tag</span><span·class="p">,</span><span·class="w">·</span><span·class="p">@</span><span·class="ss">tmp</span></code></pre><p>Just·as·for·a·<code·class="inline">try</code>-<code·class="inline">catch</code>·expression·all·code·that·can·cause·an
192 exception·in·one·of·the·protected·blocks·must·have·explicit·control192 exception·in·one·of·the·protected·blocks·must·have·explicit·control
193 flow·edges·to·the·landing·pad·block.</p><h2·id="exception-re-issuing"·class="section-heading">193 flow·edges·to·the·landing·pad·block.</p><h2·id="exception-re-issuing"·class="section-heading">
194 ··<a·href="#exception-re-issuing"·class="hover-link">194 ··<a·href="#exception-re-issuing"·class="hover-link">
195 ····<i·class="ri-link-m"·aria-hidden="true"></i>195 ····<i·class="ri-link-m"·aria-hidden="true"></i>
196 ··</a>196 ··</a>
197 ··<span·class="text">Exception·Re-issuing</span>197 ··<span·class="text">Exception·Re-issuing</span>
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230 proven·to·always·succeed·or·fail.</p></li></ul><h2·id="variable-naming"·class="section-heading">230 proven·to·always·succeed·or·fail.</p></li></ul><h2·id="variable-naming"·class="section-heading">
231 ··<a·href="#variable-naming"·class="hover-link">231 ··<a·href="#variable-naming"·class="hover-link">
232 ····<i·class="ri-link-m"·aria-hidden="true"></i>232 ····<i·class="ri-link-m"·aria-hidden="true"></i>
233 ··</a>233 ··</a>
234 ··<span·class="text">Variable·Naming</span>234 ··<span·class="text">Variable·Naming</span>
235 </h2>235 </h2>
236 <p>A·variable·name·in·BEAM·SSA·is·either·an·atom·or·a·non-negative236 <p>A·variable·name·in·BEAM·SSA·is·either·an·atom·or·a·non-negative
237 integer:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">atom</span><span·class="p"·data-group-id="0039631009-1">(</span><span·class="p"·data-group-id="0039631009-1">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="0039631009-2">(</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·44cf720fcbe3279ab3a33d4cd32f6d478b86c8f924b174e5013547788311a64f·...·]-2">)</span></code></pre><p>In·order·to·generate·fresh·unused·variable·names,·all·compiler237 integer:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">atom</span><span·class="p"·data-group-id="2064951731-1">(</span><span·class="p"·data-group-id="2064951731-1">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="2064951731-2">(</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·b64d9ee33a09b4c50998e52315314d365c12c31cd5e1edffa4c21b55b8b21b2b·...·]-2">)</span></code></pre><p>In·order·to·generate·fresh·unused·variable·names,·all·compiler
238 transforms·maintain·a·counter,·the·<code·class="inline">cnt</code>-field·in·the·<code·class="inline">b_function</code>·and238 transforms·maintain·a·counter,·the·<code·class="inline">cnt</code>-field·in·the·<code·class="inline">b_function</code>·and
239 <code·class="inline">opt_st</code>·records,·which·is·incremented·each·time·a·new·variable·or239 <code·class="inline">opt_st</code>·records,·which·is·incremented·each·time·a·new·variable·or
240 label·is·created.·In·the·following·description·the·value·of·the240 label·is·created.·In·the·following·description·the·value·of·the
241 <code·class="inline">cnt</code>-field·is·called·<code·class="inline">Cnt</code>.·The·<code·class="inline">Cnt</code>·value·is·guaranteed·to·never241 <code·class="inline">cnt</code>-field·is·called·<code·class="inline">Cnt</code>.·The·<code·class="inline">Cnt</code>·value·is·guaranteed·to·never
242 clash·with·a·previously·defined·variable·name.·Therefore,·value·of242 clash·with·a·previously·defined·variable·name.·Therefore,·value·of
243 <code·class="inline">Cnt</code>·can·directly·be·used·as·a·variable·name·in·the·SSA·passes.</p><p>Note·that·the·rules·were·more·complicated·before·Erlang/OTP·27,·because243 <code·class="inline">Cnt</code>·can·directly·be·used·as·a·variable·name·in·the·SSA·passes.</p><p>Note·that·the·rules·were·more·complicated·before·Erlang/OTP·27,·because
244 the·<code·class="inline">Cnt</code>·value·could·clash·with·other·variables.</p>244 the·<code·class="inline">Cnt</code>·value·could·clash·with·other·variables.</p>
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288 ······<p·class="built-using">288 ······<p·class="built-using">
289 ········Built·using289 ········Built·using
290 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the290 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
291 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>291 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
292 ······</p>292 ······</p>
293 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>293 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
294 ····</footer>294 ····</footer>
295 ··</div>295 ··</div>
296 </main>296 </main>
297 </div>297 </div>
298 <script>298 <script>
299 ··function·mermaidLoaded()·{299 ··function·mermaidLoaded()·{
300 ····mermaid.initialize({300 ····mermaid.initialize({
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10984 ······</p>10984 ······</p>
10985 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>10985 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
10986 ····</footer>10986 ····</footer>
10987 ··</div>10987 ··</div>
10988 </main>10988 </main>
10989 </div>10989 </div>
10990 <script>10990 <script>
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651 ········Built·using651 ········Built·using
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653 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>653 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
654 ······</p>654 ······</p>
655 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>655 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
656 ····</footer>656 ····</footer>
657 ··</div>657 ··</div>
658 </main>658 </main>
659 </div>659 </div>
660 <script>660 <script>
661 ··function·mermaidLoaded()·{661 ··function·mermaidLoaded()·{
662 ····mermaid.initialize({662 ····mermaid.initialize({
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706 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>706 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
707 ······</p>707 ······</p>
708 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>708 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
709 ····</footer>709 ····</footer>
710 ··</div>710 ··</div>
711 </main>711 </main>
712 </div>712 </div>
713 <script>713 <script>
714 ··function·mermaidLoaded()·{714 ··function·mermaidLoaded()·{
715 ····mermaid.initialize({715 ····mermaid.initialize({
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149 ····<i·class="ri-link-m"·aria-hidden="true"></i>149 ····<i·class="ri-link-m"·aria-hidden="true"></i>
150 ··</a>150 ··</a>
151 ··<span·class="text">Order·of·Compiler·Options</span>151 ··<span·class="text">Order·of·Compiler·Options</span>
152 </h2>152 </h2>
153 <p>Options·given·in·the·<code·class="inline">compile()</code>·attribute·in·the·source·code·take153 <p>Options·given·in·the·<code·class="inline">compile()</code>·attribute·in·the·source·code·take
154 precedence·over·options·given·to·the·compiler,·which·in·turn·take154 precedence·over·options·given·to·the·compiler,·which·in·turn·take
155 precedence·over·options·given·in·the·environment.</p><p>A·later·compiler·option·takes·precedence·over·an·earlier·one·in·the155 precedence·over·options·given·in·the·environment.</p><p>A·later·compiler·option·takes·precedence·over·an·earlier·one·in·the
156 option·list.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="0747203740-1">(</span><span·class="ss">something</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0747203740-2">[</span><span·class="ss">nowarn_missing_spec</span><span·class="p">,</span><span·class="ss">warn_missing_spe[·...·truncated·by·diffoscope;·len:·102,·SHA:·074a0ab2a3b26a34e4009a9daa63e2d9d99408f5b7bd139be9c70b8ba680b97f·...·]-1">)</span><span·class="p">.</span></code></pre><p>Warnings·will·be·emitted·for·functions·without·specifications,·unless156 option·list.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="4512922927-1">(</span><span·class="ss">something</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4512922927-2">[</span><span·class="ss">nowarn_missing_spec</span><span·class="p">,</span><span·class="ss">warn_missing_spe[·...·truncated·by·diffoscope;·len:·102,·SHA:·1fec1569c72ebd3187c8cc6969ddba9835c4aca40a94def152311e5f2fe92d8f·...·]-1">)</span><span·class="p">.</span></code></pre><p>Warnings·will·be·emitted·for·functions·without·specifications,·unless
157 the·source·code·for·module·<code·class="inline">something</code>·contains·a·<code·class="inline">compile(nowarn_missing_spec)</code>157 the·source·code·for·module·<code·class="inline">something</code>·contains·a·<code·class="inline">compile(nowarn_missing_spec)</code>
158 attribute.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>In·Erlang/OTP·26·and·earlier,·the·option·order·was·the·opposite·of·what158 attribute.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>In·Erlang/OTP·26·and·earlier,·the·option·order·was·the·opposite·of·what
159 is·described·here.</p></section><h2·id="module-inlining"·class="section-heading">159 is·described·here.</p></section><h2·id="module-inlining"·class="section-heading">
160 ··<a·href="#module-inlining"·class="hover-link">160 ··<a·href="#module-inlining"·class="hover-link">
161 ····<i·class="ri-link-m"·aria-hidden="true"></i>161 ····<i·class="ri-link-m"·aria-hidden="true"></i>
162 ··</a>162 ··</a>
163 ··<span·class="text">Inlining</span>163 ··<span·class="text">Inlining</span>
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173 all·calls·to·the·function·are·inlined.</p><p>Inlining·does·not·necessarily·improve·running·time.·For·example,·inlining·can173 all·calls·to·the·function·are·inlined.</p><p>Inlining·does·not·necessarily·improve·running·time.·For·example,·inlining·can
174 increase·Beam·stack·use,·which·probably·is·detrimental·to·performance·for174 increase·Beam·stack·use,·which·probably·is·detrimental·to·performance·for
175 recursive·functions.</p><p>Inlining·is·never·default.·It·must·be·explicitly·enabled·with·a·compiler·option175 recursive·functions.</p><p>Inlining·is·never·default.·It·must·be·explicitly·enabled·with·a·compiler·option
176 or·a·<code·class="inline">-compile()</code>·attribute·in·the·source·module.</p><p>To·enable·inlining,·either·use·the·option·<code·class="inline">inline</code>·to·let·the·compiler·decide176 or·a·<code·class="inline">-compile()</code>·attribute·in·the·source·module.</p><p>To·enable·inlining,·either·use·the·option·<code·class="inline">inline</code>·to·let·the·compiler·decide
177 which·functions·to·inline,·or·<code·class="inline">{inline,[{Name,Arity},...]}</code>·to·have·the·compiler177 which·functions·to·inline,·or·<code·class="inline">{inline,[{Name,Arity},...]}</code>·to·have·the·compiler
178 inline·all·calls·to·the·given·functions.·If·the·option·is·given·inside·a178 inline·all·calls·to·the·given·functions.·If·the·option·is·given·inside·a
179 <code·class="inline">compile</code>·directive·in·an·Erlang·module,·<code·class="inline">{Name,Arity}</code>·can·be·written·as179 <code·class="inline">compile</code>·directive·in·an·Erlang·module,·<code·class="inline">{Name,Arity}</code>·can·be·written·as
180 <code·class="inline">Name/Arity</code>.</p><p>Example·of·explicit·inlining:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="3050414779-1">(</span><span·class="p"·data-group-id="3050414779-2">{</span><span·class="ss">inline</span><span·class="p">,</span><span·class="p"·data-group-id="3050414779-3">[</span><span·class="ss">pi</span><span·class="p">/</span><span·class="mi">0</span[·...·truncated·by·diffoscope;·len:·148,·SHA:·ebe4eaf64adc3ee15119993fae8ddaa33564d05c90b7033ab5641127663d0c29·...·]-1">)</span><span·class="p">.</span><span·class="w">180 <code·class="inline">Name/Arity</code>.</p><p>Example·of·explicit·inlining:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="0003898624-1">(</span><span·class="p"·data-group-id="0003898624-2">{</span><span·class="ss">inline</span><span·class="p">,</span><span·class="p"·data-group-id="0003898624-3">[</span><span·class="ss">pi</span><span·class="p">/</span><span·class="mi">0</span[·...·truncated·by·diffoscope;·len:·148,·SHA:·b74130604f099e02cd33e9ebdc6325e273ac3d8af6daf7fbb88d3ed02e1d8a0b·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
181 </span><span·class="nf">pi</span><span·class="p"·data-group-id="3050414779-4">(</span><span·class="p"·data-group-id="3050414779-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mf">3.1416</span><span·class="p">.</span></code></pre><p>Example·of·implicit·inlining:</p><pre><code·class="text">-compile(inline).</code></pre><p>The·option·<code·class="inline">{inline_size,Size}</code>·controls·how·large·functions·that·are·allowed·to181 </span><span·class="nf">pi</span><span·class="p"·data-group-id="0003898624-4">(</span><span·class="p"·data-group-id="0003898624-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mf">3.1416</span><span·class="p">.</span></code></pre><p>Example·of·implicit·inlining:</p><pre><code·class="text">-compile(inline).</code></pre><p>The·option·<code·class="inline">{inline_size,Size}</code>·controls·how·large·functions·that·are·allowed·to
182 be·inlined.·Default·is·<code·class="inline">24</code>,·which·keeps·the·size·of·the·inlined·code·roughly182 be·inlined.·Default·is·<code·class="inline">24</code>,·which·keeps·the·size·of·the·inlined·code·roughly
183 the·same·as·the·un-inlined·version·(only·relatively·small·functions·are183 the·same·as·the·un-inlined·version·(only·relatively·small·functions·are
184 inlined).</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Aggressive·inlining·-·will·increase·code·size.</span><span·class="w">184 inlined).</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Aggressive·inlining·-·will·increase·code·size.</span><span·class="w">
185 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="5039746406-1">(</span><span·class="ss">inline</span><span·class="p"·data-group-id="5039746406-1">)</span><span·class="p">.</span><span·class="w">185 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="1244343410-1">(</span><span·class="ss">inline</span><span·class="p"·data-group-id="1244343410-1">)</span><span·class="p">.</span><span·class="w">
186 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="5039746406-2">(</span><span·class="p"·data-group-id="5039746406-3">{</span><span·class="ss">inline_size</span><span·class="p">,</span><span·class="mi">100</span><span·class="p"·data-group-id="5039746406-3">}</span><span·class="p"·data-group-id="5039746406-2">)</span><span·class="p">.</span></code></pre><h2·id="module-inlining-of-list-functions"·class="section-heading">186 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="1244343410-2">(</span><span·class="p"·data-group-id="1244343410-3">{</span><span·class="ss">inline_size</span><span·class="p">,</span><span·class="mi">100</span><span·class="p"·data-group-id="1244343410-3">}</span><span·class="p"·data-group-id="1244343410-2">)</span><span·class="p">.</span></code></pre><h2·id="module-inlining-of-list-functions"·class="section-heading">
187 ··<a·href="#module-inlining-of-list-functions"·class="hover-link">187 ··<a·href="#module-inlining-of-list-functions"·class="hover-link">
188 ····<i·class="ri-link-m"·aria-hidden="true"></i>188 ····<i·class="ri-link-m"·aria-hidden="true"></i>
189 ··</a>189 ··</a>
190 ··<span·class="text">Inlining·of·List·Functions</span>190 ··<span·class="text">Inlining·of·List·Functions</span>
191 </h2>191 </h2>
192 <p>The·compiler·can·also·inline·various·list·manipulation·functions·from·the·module192 <p>The·compiler·can·also·inline·various·list·manipulation·functions·from·the·module
193 <code·class="inline">list</code>·in·STDLIB.</p><p>This·feature·must·be·explicitly·enabled·with·a·compiler·option·or·a·<code·class="inline">-compile()</code>193 <code·class="inline">list</code>·in·STDLIB.</p><p>This·feature·must·be·explicitly·enabled·with·a·compiler·option·or·a·<code·class="inline">-compile()</code>
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900 features.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·option·has·no·effect·when·used·in·a·<code·class="inline">-compile(..)</code>·attribute.·Instead,900 features.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·option·has·no·effect·when·used·in·a·<code·class="inline">-compile(..)</code>·attribute.·Instead,
901 the·<code·class="inline">-feature(..)</code>·directive·(described·next)·should·be·used.</p><p><a·href=""·id="feature-directive"></a>·A·feature·can·also·be·enabled·(disabled)·using901 the·<code·class="inline">-feature(..)</code>·directive·(described·next)·should·be·used.</p><p><a·href=""·id="feature-directive"></a>·A·feature·can·also·be·enabled·(disabled)·using
902 the·<code·class="inline">-feature(Feature,·enable·|·disable).</code>·module·directive.·Note·that·this902 the·<code·class="inline">-feature(Feature,·enable·|·disable).</code>·module·directive.·Note·that·this
903 directive·can·only·be·present·in·a·prefix·of·the·file,·before·exports·and903 directive·can·only·be·present·in·a·prefix·of·the·file,·before·exports·and
904 function·definitions.·This·is·the·preferred·method·of·enabling·and·disabling904 function·definitions.·This·is·the·preferred·method·of·enabling·and·disabling
905 features,·since·it·is·a·local·property·of·a·module.</p></section></li><li><p><strong><code·class="inline">makedep</code></strong>·-·Produces·a·Makefile·rule·to·track·headers·dependencies.·No905 features,·since·it·is·a·local·property·of·a·module.</p></section></li><li><p><strong><code·class="inline">makedep</code></strong>·-·Produces·a·Makefile·rule·to·track·headers·dependencies.·No
906 object·file·is·produced.</p><p>By·default,·this·rule·is·written·to·<code·class="inline">&lt;File&gt;.Pbeam</code>.·However,·if·option906 object·file·is·produced.</p><p>By·default,·this·rule·is·written·to·<code·class="inline">&lt;File&gt;.Pbeam</code>.·However,·if·option
907 <code·class="inline">binary</code>·is·set,·nothing·is·written·and·the·rule·is·returned·in·<code·class="inline">Binary</code>.</p><p>The·output·will·be·encoded·in·UTF-8.</p><p>For·example,·if·you·have·the·following·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1368981177-1">(</span><span·class="ss">module</span><span·class="p"·data-group-id="1368981177-1">)</span><span·class="p">.</span><span·class="w">907 <code·class="inline">binary</code>·is·set,·nothing·is·written·and·the·rule·is·returned·in·<code·class="inline">Binary</code>.</p><p>The·output·will·be·encoded·in·UTF-8.</p><p>For·example,·if·you·have·the·following·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8609149407-1">(</span><span·class="ss">module</span><span·class="p"·data-group-id="8609149407-1">)</span><span·class="p">.</span><span·class="w">
908 </span><span·class="w">908 </span><span·class="w">
909 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="1368981177-2">(</span><span·class="s">&quot;eunit/include/eunit.hrl&quot;</span><span·class="p"·data-group-id="1368981177-2">)</span><span·class="p">.</span><span·class="w">909 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8609149407-2">(</span><span·class="s">&quot;eunit/include/eunit.hrl&quot;</span><span·class="p"·data-group-id="8609149407-2">)</span><span·class="p">.</span><span·class="w">
910 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="1368981177-3">(</span><span·class="s">&quot;header.hrl&quot;</span><span·class="p"·data-group-id="1368981177-3">)</span><span·class="p">.</span></code></pre><p>The·Makefile·rule·generated·by·this·option·looks·as·follows:</p><pre><code·class="text">module.beam:·module.erl·\910 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="8609149407-3">(</span><span·class="s">&quot;header.hrl&quot;</span><span·class="p"·data-group-id="8609149407-3">)</span><span·class="p">.</span></code></pre><p>The·Makefile·rule·generated·by·this·option·looks·as·follows:</p><pre><code·class="text">module.beam:·module.erl·\
911 ··/usr/local/lib/erlang/lib/eunit/include/eunit.hrl·\911 ··/usr/local/lib/erlang/lib/eunit/include/eunit.hrl·\
912 ··header.hrl</code></pre></li><li><p><strong><code·class="inline">makedep_side_effect</code></strong>·-·The·dependencies·are·created·as·a·side·effect·to912 ··header.hrl</code></pre></li><li><p><strong><code·class="inline">makedep_side_effect</code></strong>·-·The·dependencies·are·created·as·a·side·effect·to
913 the·normal·compilation·process.·This·means·that·the·object·file·will·also·be913 the·normal·compilation·process.·This·means·that·the·object·file·will·also·be
914 produced.·This·option·override·the·<code·class="inline">makedep</code>·option.</p></li><li><p><strong><code·class="inline">{makedep_output,·Output}</code></strong>·-·Writes·generated·rules·to·<code·class="inline">Output</code>·instead·of914 produced.·This·option·override·the·<code·class="inline">makedep</code>·option.</p></li><li><p><strong><code·class="inline">{makedep_output,·Output}</code></strong>·-·Writes·generated·rules·to·<code·class="inline">Output</code>·instead·of
915 the·default·<code·class="inline">&lt;File&gt;.Pbeam</code>.·<code·class="inline">Output</code>·can·be·a·filename·or·an·<code·class="inline">io_device()</code>.·To915 the·default·<code·class="inline">&lt;File&gt;.Pbeam</code>.·<code·class="inline">Output</code>·can·be·a·filename·or·an·<code·class="inline">io_device()</code>.·To
916 write·to·stdout,·use·<code·class="inline">standard_io</code>.·However,·if·<code·class="inline">binary</code>·is·set,·nothing·is916 write·to·stdout,·use·<code·class="inline">standard_io</code>.·However,·if·<code·class="inline">binary</code>·is·set,·nothing·is
917 written·to·<code·class="inline">Output</code>·and·the·result·is·returned·to·the·caller·with917 written·to·<code·class="inline">Output</code>·and·the·result·is·returned·to·the·caller·with
Offset 969, 15 lines modifiedOffset 969, 15 lines modified
969 that·verification·(there·will·not·even·be·a·warning·if·there·is·a969 that·verification·(there·will·not·even·be·a·warning·if·there·is·a
970 mismatch).</p></li><li><p><strong><code·class="inline">{no_auto_import,[{F,A},·...]}</code></strong>·-·Makes·the·function·<code·class="inline">F/A</code>·no·longer·being970 mismatch).</p></li><li><p><strong><code·class="inline">{no_auto_import,[{F,A},·...]}</code></strong>·-·Makes·the·function·<code·class="inline">F/A</code>·no·longer·being
971 auto-imported·from·the·<code·class="inline">erlang</code>·module,·which·resolves·BIF·name·clashes.·This971 auto-imported·from·the·<code·class="inline">erlang</code>·module,·which·resolves·BIF·name·clashes.·This
972 option·must·be·used·to·resolve·name·clashes·with·auto-imported·BIFs·that·existed972 option·must·be·used·to·resolve·name·clashes·with·auto-imported·BIFs·that·existed
973 before·Erlang/OTP·R14A··when·calling·a·local·function·with·the·same·name973 before·Erlang/OTP·R14A··when·calling·a·local·function·with·the·same·name
974 as·an·auto-imported·BIF·without·module·prefix.</p><p>If·the·BIF·is·to·be·called,·use·the·<code·class="inline">erlang</code>·module·prefix974 as·an·auto-imported·BIF·without·module·prefix.</p><p>If·the·BIF·is·to·be·called,·use·the·<code·class="inline">erlang</code>·module·prefix
975 in·the·call,·not·<code·class="inline">{no_auto_import,[{F,A},·...]}</code>.</p><p>If·this·option·is·written·in·the·source·code,·as·a·<code·class="inline">-compile</code>·directive,·the975 in·the·call,·not·<code·class="inline">{no_auto_import,[{F,A},·...]}</code>.</p><p>If·this·option·is·written·in·the·source·code,·as·a·<code·class="inline">-compile</code>·directive,·the
976 syntax·<code·class="inline">F/A</code>·can·be·used·instead·of·<code·class="inline">{F,A}</code>.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="7466011372-1">(</span><span·class="p"·data-group-id="7466011372-2">{</span><span·class="ss">no_auto_import</span><span·class="p">,</span><span·class="p"·data-group-id="7466011372-3">[</span><span·class="ss">error</span><span·class="p">/</span><span·class="[·...·truncated·by·diffoscope;·len:·159,·SHA:·18260d183235b9d65f101c2f086ac58407471d754fc1e39eb48bae1b986f3cfc·...·]-1">)</span><span·class="p">.</span></code></pre></li><li><p><strong><code·class="inline">no_auto_import</code></strong>·-·Do·not·auto-import·any·functions·from·<code·class="inline">erlang</code>·module.</p></li><li><p><strong><code·class="inline">no_line_info</code></strong>·-·Omits·line·number·information·to·produce·a·slightly976 syntax·<code·class="inline">F/A</code>·can·be·used·instead·of·<code·class="inline">{F,A}</code>.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="9537775300-1">(</span><span·class="p"·data-group-id="9537775300-2">{</span><span·class="ss">no_auto_import</span><span·class="p">,</span><span·class="p"·data-group-id="9537775300-3">[</span><span·class="ss">error</span><span·class="p">/</span><span·class="[·...·truncated·by·diffoscope;·len:·159,·SHA:·01a9f15385fb6b667c241306490e4ea08cf449ae1008a0c1f00de227ecea0d39·...·]-1">)</span><span·class="p">.</span></code></pre></li><li><p><strong><code·class="inline">no_auto_import</code></strong>·-·Do·not·auto-import·any·functions·from·<code·class="inline">erlang</code>·module.</p></li><li><p><strong><code·class="inline">no_line_info</code></strong>·-·Omits·line·number·information·to·produce·a·slightly
977 smaller·output·file.</p></li><li><p><strong><code·class="inline">no_lint</code></strong>·-·Skips·the·pass·that·checks·for·errors·and·warnings.·Only977 smaller·output·file.</p></li><li><p><strong><code·class="inline">no_lint</code></strong>·-·Skips·the·pass·that·checks·for·errors·and·warnings.·Only
978 applicable·together·with·the·<code·class="inline">from_abstr</code>·option.·This·is·mainly·for978 applicable·together·with·the·<code·class="inline">from_abstr</code>·option.·This·is·mainly·for
979 implementations·of·other·languages·on·top·of·Erlang,·which·have·already·done979 implementations·of·other·languages·on·top·of·Erlang,·which·have·already·done
980 their·own·checks·to·guarantee·correctness·of·the·code.</p><p>Caveat:·When·this·option·is·used,·there·are·no·guarantees·that·the·code·output980 their·own·checks·to·guarantee·correctness·of·the·code.</p><p>Caveat:·When·this·option·is·used,·there·are·no·guarantees·that·the·code·output
981 by·the·compiler·is·correct·and·safe·to·use.·The·responsibility·for·correctness981 by·the·compiler·is·correct·and·safe·to·use.·The·responsibility·for·correctness
982 lies·on·the·code·or·person·generating·the·abstract·format.·If·the·code982 lies·on·the·code·or·person·generating·the·abstract·format.·If·the·code
983 contains·errors,·the·compiler·may·crash·or·produce·unsafe·code.</p></li><li><p><strong><code·class="inline">{extra_chunks,·[{binary(),·binary()}]}</code></strong>·-·Pass·extra·chunks·to·be·stored983 contains·errors,·the·compiler·may·crash·or·produce·unsafe·code.</p></li><li><p><strong><code·class="inline">{extra_chunks,·[{binary(),·binary()}]}</code></strong>·-·Pass·extra·chunks·to·be·stored
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1325 ······<p·class="built-using">1325 ······<p·class="built-using">
1326 ········Built·using1326 ········Built·using
1327 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1327 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1328 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1328 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1329 ······</p>1329 ······</p>
1330 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1330 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1331 ····</footer>1331 ····</footer>
1332 ··</div>1332 ··</div>
1333 </main>1333 </main>
1334 </div>1334 </div>
1335 <script>1335 <script>
1336 ··function·mermaidLoaded()·{1336 ··function·mermaidLoaded()·{
1337 ····mermaid.initialize({1337 ····mermaid.initialize({
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169 </h2>169 </h2>
170 <h3·id="fixed-bugs-and-malfunctions-2"·class="section-heading">170 <h3·id="fixed-bugs-and-malfunctions-2"·class="section-heading">
171 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">171 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">
172 ····<i·class="ri-link-m"·aria-hidden="true"></i>172 ····<i·class="ri-link-m"·aria-hidden="true"></i>
173 ··</a>173 ··</a>
174 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>174 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>
175 </h3>175 </h3>
176 <ul><li><p>Fixed·a·crash·in·the·common·sub-expression·elimination·pass.</p><p>Own·Id:·OTP-19243·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8818"·title="">GH-8818</a>,·<a·href="https://github.com/erlang/otp/pull/8838"·title="">PR-8838</a></p></li><li><p>Fixed·a·bug·where·bogus·code·was·generated·for·consecutive·calls·to·<code·class="inline">erlang:setelement/2</code>,·potentially·crashing·the·runtime·system.</p><p>Own·Id:·OTP-19270·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8783"·title="">GH-8783</a>,·<a·href="https://github.com/erlang/otp/pull/8898"·title="">PR-8898</a></p></li><li><p>When·the·<code·class="inline">line_coverage</code>·option·was·used,·exceptions·could·show·the·wrong·line·for·where·the·exception·was·raised.</p><p>Own·Id:·OTP-19282·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8907"·title="">PR-8907</a></p></li><li><p>The·<code·class="inline">line_coverage</code>·option·would·be·ignored·if·given·in·a·<code·class="inline">compile()</code>·attribute·within·a·module.</p><p>Own·Id:·OTP-19309·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8942"·title="">GH-8942</a>,·<a·href="https://github.com/erlang/otp/pull/8970"·title="">PR-8970</a></p></li><li><p>A·segment·matching·a·float·in·a·binary·generator·will·now·skip·any·invalid·float·(such·as·a·NaN)·and·continue·matching·the·rest·of·the·binary.·Before·this·correction,·the·comprehension·would·stop·as·soon·as·an·invalid·float·was·encountered.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">BadFloat</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2315251233-1">&lt;&lt;</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">64</span><span·class="p"·data-group-id="2315251233-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">176 <ul><li><p>Fixed·a·crash·in·the·common·sub-expression·elimination·pass.</p><p>Own·Id:·OTP-19243·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8818"·title="">GH-8818</a>,·<a·href="https://github.com/erlang/otp/pull/8838"·title="">PR-8838</a></p></li><li><p>Fixed·a·bug·where·bogus·code·was·generated·for·consecutive·calls·to·<code·class="inline">erlang:setelement/2</code>,·potentially·crashing·the·runtime·system.</p><p>Own·Id:·OTP-19270·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8783"·title="">GH-8783</a>,·<a·href="https://github.com/erlang/otp/pull/8898"·title="">PR-8898</a></p></li><li><p>When·the·<code·class="inline">line_coverage</code>·option·was·used,·exceptions·could·show·the·wrong·line·for·where·the·exception·was·raised.</p><p>Own·Id:·OTP-19282·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8907"·title="">PR-8907</a></p></li><li><p>The·<code·class="inline">line_coverage</code>·option·would·be·ignored·if·given·in·a·<code·class="inline">compile()</code>·attribute·within·a·module.</p><p>Own·Id:·OTP-19309·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8942"·title="">GH-8942</a>,·<a·href="https://github.com/erlang/otp/pull/8970"·title="">PR-8970</a></p></li><li><p>A·segment·matching·a·float·in·a·binary·generator·will·now·skip·any·invalid·float·(such·as·a·NaN)·and·continue·matching·the·rest·of·the·binary.·Before·this·correction,·the·comprehension·would·stop·as·soon·as·an·invalid·float·was·encountered.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">BadFloat</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5670282956-1">&lt;&lt;</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">64</span><span·class="p"·data-group-id="5670282956-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">
177 </span><span·class="p"·data-group-id="2315251233-2">&lt;&lt;</span><span·class="s">&quot;ÿÿÿÿÿÿÿÿ&quot;</span><span·class="p"·data-group-id="2315251233-2">&gt;&gt;</span><span·class="gp·unselectable">177 </span><span·class="p"·data-group-id="5670282956-2">&lt;&lt;</span><span·class="s">&quot;ÿÿÿÿÿÿÿÿ&quot;</span><span·class="p"·data-group-id="5670282956-2">&gt;&gt;</span><span·class="gp·unselectable">
178 2&gt;·</span><span·class="p"·data-group-id="2315251233-3">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="p"·data-group-id="2315251233-4">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="mi">64</span><sp[·...·truncated·by·diffoscope;·len:·641,·SHA:·625f29a2d81854d25b775bf780c9271e1814eaa57a3b292db33b240d1101b3f5·...·]-3">]</span><span·class="p">.</span><span·class="w">178 2&gt;·</span><span·class="p"·data-group-id="5670282956-3">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="p"·data-group-id="5670282956-4">&lt;&lt;</span><span·class="n">X</span><span·class="p">:</span><span·class="mi">64</span><sp[·...·truncated·by·diffoscope;·len:·641,·SHA:·410c98112477d861cc816f094e52d759bb7980c4aaafceb81c9df414d22173d3·...·]-3">]</span><span·class="p">.</span><span·class="w">
179 </span><span·class="p"·data-group-id="2315251233-6">[</span><span·class="mf">0.0</span><span·class="p">,</span><span·class="mf">42.0</span><span·class="p"·data-group-id="2315251233-6">]</span></code></pre><p>Own·Id:·OTP-19331·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8978"·title="">PR-8978</a></p></li></ul><h2·id="compiler-8-5-3"·class="section-heading">179 </span><span·class="p"·data-group-id="5670282956-6">[</span><span·class="mf">0.0</span><span·class="p">,</span><span·class="mf">42.0</span><span·class="p"·data-group-id="5670282956-6">]</span></code></pre><p>Own·Id:·OTP-19331·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8978"·title="">PR-8978</a></p></li></ul><h2·id="compiler-8-5-3"·class="section-heading">
180 ··<a·href="#compiler-8-5-3"·class="hover-link">180 ··<a·href="#compiler-8-5-3"·class="hover-link">
181 ····<i·class="ri-link-m"·aria-hidden="true"></i>181 ····<i·class="ri-link-m"·aria-hidden="true"></i>
182 ··</a>182 ··</a>
183 ··<span·class="text">Compiler·8.5.3</span>183 ··<span·class="text">Compiler·8.5.3</span>
184 </h2>184 </h2>
185 <h3·id="fixed-bugs-and-malfunctions-3"·class="section-heading">185 <h3·id="fixed-bugs-and-malfunctions-3"·class="section-heading">
186 ··<a·href="#fixed-bugs-and-malfunctions-3"·class="hover-link">186 ··<a·href="#fixed-bugs-and-malfunctions-3"·class="hover-link">
Offset 220, 61 lines modifiedOffset 220, 61 lines modified
220 </h2>220 </h2>
221 <h3·id="fixed-bugs-and-malfunctions-6"·class="section-heading">221 <h3·id="fixed-bugs-and-malfunctions-6"·class="section-heading">
222 ··<a·href="#fixed-bugs-and-malfunctions-6"·class="hover-link">222 ··<a·href="#fixed-bugs-and-malfunctions-6"·class="hover-link">
223 ····<i·class="ri-link-m"·aria-hidden="true"></i>223 ····<i·class="ri-link-m"·aria-hidden="true"></i>
224 ··</a>224 ··</a>
225 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>225 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>
226 </h3>226 </h3>
227 <ul><li><p>Generators·for·binary·comprehensions·could·be·evaluated·before·it·was·known·that·they·would·be·needed.·That·could·result·in·a·binary·comprehensions·failing·if·a·generator·that·should·not·be·evaluated·until·later·failed.</p><p>As·an·example,·consider·this·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0449453815-1">(</span><span·class="ss">t</span><span·class="p"·data-group-id="0449453815-1">)</span><span·class="p">.</span><span·class="w">227 <ul><li><p>Generators·for·binary·comprehensions·could·be·evaluated·before·it·was·known·that·they·would·be·needed.·That·could·result·in·a·binary·comprehensions·failing·if·a·generator·that·should·not·be·evaluated·until·later·failed.</p><p>As·an·example,·consider·this·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8131165685-1">(</span><span·class="ss">t</span><span·class="p"·data-group-id="8131165685-1">)</span><span·class="p">.</span><span·class="w">
228 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0449453815-2">(</span><span·class="p"·data-group-id="0449453815-3">[</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="0449453815-3">]</span><span·class="p"·data-group-id="0449453815-2">)</span><span·class="p">.</span><span·class="w">228 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8131165685-2">(</span><span·class="p"·data-group-id="8131165685-3">[</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="8131165685-3">]</span><span·class="p"·data-group-id="8131165685-2">)</span><span·class="p">.</span><span·class="w">
  
229 </span><span·class="nf">f</span><span·class="p"·data-group-id="0449453815-4">(</span><span·class="p"·data-group-id="0449453815-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">229 </span><span·class="nf">f</span><span·class="p"·data-group-id="8131165685-4">(</span><span·class="p"·data-group-id="8131165685-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
230 ····</span><span·class="p"·data-group-id="0449453815-5">&lt;&lt;</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·730,·SHA:·8b86b07331dfa4e43585d641de3833c74e9c1c85c9003ebadef5e682d68c2bb2·...·]-1">)</span><span·class="p">.</span><span·class="w">230 ····</span><span·class="p"·data-group-id="8131165685-5">&lt;&lt;</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">||</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·730,·SHA:·2df56eca356800210b987ee85fd350927f6ec29112452d04c5be347fbc85295d·...·]-1">)</span><span·class="p">.</span><span·class="w">
231 </span><span·class="gt">**·exception·error:·bad·generator·ok231 </span><span·class="gt">**·exception·error:·bad·generator·ok
232 ·····in·function··t:f/0·(t.erl,·line·6)</span></code></pre><p>In·Erlang/OTP·27·it·returns·an·empty·binary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">t</span><span·class="p">:</span><span·class="nf">f</span><span·class="p"·data-group-id="3635864676-1">(</span><span·class="p"·data-group-id="3635864676-1">)</span><span·class="p">.</span><span·class="w">232 ·····in·function··t:f/0·(t.erl,·line·6)</span></code></pre><p>In·Erlang/OTP·27·it·returns·an·empty·binary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">t</span><span·class="p">:</span><span·class="nf">f</span><span·class="p"·data-group-id="4796746316-1">(</span><span·class="p"·data-group-id="4796746316-1">)</span><span·class="p">.</span><span·class="w">
233 </span><span·class="p"·data-group-id="3635864676-2">&lt;&lt;</span><span·class="p"·data-group-id="3635864676-2">&gt;&gt;</span></code></pre><p>Own·Id:·OTP-18703·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/7494"·title="">GH-7494</a>,·<a·href="https://github.com/erlang/otp/pull/7538"·title="">PR-7538</a></p></li><li><p>The·documentation·for·the·preprocessor·now·mentions·that·<code·class="inline">defined(Name)</code>·can·be·called·in·the·condition·for·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·directive·to·test·whether·<code·class="inline">Name</code>·is·the·name·of·a·defined·macro.·(This·feature·was·implemented·in·OTP·21.)</p><p>If·a·function·call·in·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·with·a·name·that·is·not·the·name·of·a·guard·BIF,·there·would·not·be·a·compilation·error,·but·would·instead·cause·the·lines·following·the·directive·to·be·skipped.·This·has·now·been·changed·to·be·a·compilation·error.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18784·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/7706"·title="">GH-7706</a>,·<a·href="https://github.com/erlang/otp/pull/7726"·title="">PR-7726</a></p></li></ul><h3·id="improvements-and-new-features-1"·class="section-heading">233 </span><span·class="p"·data-group-id="4796746316-2">&lt;&lt;</span><span·class="p"·data-group-id="4796746316-2">&gt;&gt;</span></code></pre><p>Own·Id:·OTP-18703·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/7494"·title="">GH-7494</a>,·<a·href="https://github.com/erlang/otp/pull/7538"·title="">PR-7538</a></p></li><li><p>The·documentation·for·the·preprocessor·now·mentions·that·<code·class="inline">defined(Name)</code>·can·be·called·in·the·condition·for·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·directive·to·test·whether·<code·class="inline">Name</code>·is·the·name·of·a·defined·macro.·(This·feature·was·implemented·in·OTP·21.)</p><p>If·a·function·call·in·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·with·a·name·that·is·not·the·name·of·a·guard·BIF,·there·would·not·be·a·compilation·error,·but·would·instead·cause·the·lines·following·the·directive·to·be·skipped.·This·has·now·been·changed·to·be·a·compilation·error.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18784·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/7706"·title="">GH-7706</a>,·<a·href="https://github.com/erlang/otp/pull/7726"·title="">PR-7726</a></p></li></ul><h3·id="improvements-and-new-features-1"·class="section-heading">
234 ··<a·href="#improvements-and-new-features-1"·class="hover-link">234 ··<a·href="#improvements-and-new-features-1"·class="hover-link">
235 ····<i·class="ri-link-m"·aria-hidden="true"></i>235 ····<i·class="ri-link-m"·aria-hidden="true"></i>
236 ··</a>236 ··</a>
237 ··<span·class="text">Improvements·and·New·Features</span>237 ··<span·class="text">Improvements·and·New·Features</span>
238 </h3>238 </h3>
239 <ul><li><p>The·compiler·now·emits·nicer·error·message·for·function·head·mismatches.239 <ul><li><p>The·compiler·now·emits·nicer·error·message·for·function·head·mismatches.
240 For·example,·given:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">a</span><span·class="p"·data-group-id="4196800623-1">(</span><span·class="p"·data-group-id="4196800623-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">240 For·example,·given:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">a</span><span·class="p"·data-group-id="7505626256-1">(</span><span·class="p"·data-group-id="7505626256-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
241 </span><span·class="nf">a</span><span·class="p"·data-group-id="4196800623-2">(</span><span·class="p">_</span><span·class="p"·data-group-id="4196800623-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p>Erlang/OTP·26·and·earlier·would·emit·a·diagnostic·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch241 </span><span·class="nf">a</span><span·class="p"·data-group-id="7505626256-2">(</span><span·class="p">_</span><span·class="p"·data-group-id="7505626256-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p>Erlang/OTP·26·and·earlier·would·emit·a·diagnostic·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch
242 %····6|·a(_)·-&gt;·error.242 %····6|·a(_)·-&gt;·error.
243 %·····|·^</code></pre><p>while·in·Erlang/OTP·27·the·diagnostic·is·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch:·function·a·with·arities·0·and·1·is·regarded·as·two·distinct·functions.·Is·the·number·of·arguments·incorrect·or·is·the·semicolon·in·a/0·unwanted?243 %·····|·^</code></pre><p>while·in·Erlang/OTP·27·the·diagnostic·is·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch:·function·a·with·arities·0·and·1·is·regarded·as·two·distinct·functions.·Is·the·number·of·arguments·incorrect·or·is·the·semicolon·in·a/0·unwanted?
244 %····6|·a(_)·-&gt;·error.244 %····6|·a(_)·-&gt;·error.
245 %·····|·^</code></pre><p>Own·Id:·OTP-18648·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7383"·title="">PR-7383</a></p></li><li><p>The·compiler·now·optimizes·creation·of·binaries·that·are·known·to·be·constant.</p><p>Consider·this·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bin</span><span·class="p"·data-group-id="5562139625-1">(</span><span·class="p"·data-group-id="5562139625-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">245 %·····|·^</code></pre><p>Own·Id:·OTP-18648·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7383"·title="">PR-7383</a></p></li><li><p>The·compiler·now·optimizes·creation·of·binaries·that·are·known·to·be·constant.</p><p>Consider·this·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bin</span><span·class="p"·data-group-id="5790549428-1">(</span><span·class="p"·data-group-id="5790549428-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
246 ····</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">char</span><span·class="p"·data-group-id="5562139625-2">(</span><span·class="p"·data-group-id="5562139625-2">)</span><span·class="p">,</span><span·class="w">246 ····</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">char</span><span·class="p"·data-group-id="5790549428-2">(</span><span·class="p"·data-group-id="5790549428-2">)</span><span·class="p">,</span><span·class="w">
247 ····</span><span·class="p"·data-group-id="5562139625-3">&lt;&lt;</span><span·class="n">C</span><span·class="p"·data-group-id="5562139625-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">247 ····</span><span·class="p"·data-group-id="5790549428-3">&lt;&lt;</span><span·class="n">C</span><span·class="p"·data-group-id="5790549428-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">
  
248 </span><span·class="nf">char</span><span·class="p"·data-group-id="5562139625-4">(</span><span·class="p"·data-group-id="5562139625-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="sc">$*</span><span·class="p">.</span></code></pre><p>Essentially,·the·compiler·rewrites·the·e[·...·truncated·by·diffoscope;·len:·211,·SHA:·85a78cd84c4316ba62d5adaf84d17bdac9e0316ee51120e3792a8887c832c86f·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">248 </span><span·class="nf">char</span><span·class="p"·data-group-id="5790549428-4">(</span><span·class="p"·data-group-id="5790549428-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="sc">$*</span><span·class="p">.</span></code></pre><p>Essentially,·the·compiler·rewrites·the·e[·...·truncated·by·diffoscope;·len:·211,·SHA:·46cc336f3570a7612c2073838f3f75cb0c875b823ed274af380475f65a0e056e·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
249 ····</span><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">char</span><span·class="p"·data-group-id="8868193584-2">(</span><span·class="p"·data-group-id="8868193584-2">)</span><span·class="p">,</span><span·class="w">249 ····</span><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">char</span><span·class="p"·data-group-id="9997405185-2">(</span><span·class="p"·data-group-id="9997405185-2">)</span><span·class="p">,</span><span·class="w">
250 ····</span><span·class="p"·data-group-id="8868193584-3">&lt;&lt;</span><span·class="sc">$*</span><span·class="p"·data-group-id="8868193584-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">250 ····</span><span·class="p"·data-group-id="9997405185-3">&lt;&lt;</span><span·class="sc">$*</span><span·class="p"·data-group-id="9997405185-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">
  
251 </span><span·class="nf">char</span><span·class="p"·data-group-id="8868193584-4">(</span><span·class="p"·data-group-id="8868193584-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="sc">$*</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-18673·Aux·Id:·<a·href="http[·...·truncated·by·diffoscope;·len:·818,·SHA:·a42cd83faff262d2bbac7c47409a6b1ee2f110867510a98421ada418360f159f·...·]-1">)</span><span·class="p">.</span><span·class="w">251 </span><span·class="nf">char</span><span·class="p"·data-group-id="9997405185-4">(</span><span·class="p"·data-group-id="9997405185-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="sc">$*</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-18673·Aux·Id:·<a·href="http[·...·truncated·by·diffoscope;·len:·818,·SHA:·64a66749fb33340e3ca6134de96f06923b0c6113dbd5cb68466432dec1a46a12·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
252 </span><span·class="nf">update</span><span·class="p"·data-group-id="6483012726-3">(</span><span·class="n">Value</span><span·class="p"·data-group-id="6483012726-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">252 </span><span·class="nf">update</span><span·class="p"·data-group-id="8422532388-3">(</span><span·class="n">Value</span><span·class="p"·data-group-id="8422532388-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
253 ····</span><span·class="n">R0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="6483012726-4">{</span><span·class="p"·data-group-id="6483012726-4">}</span><span·class="p">,</span><span·class="w">253 ····</span><span·class="n">R0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="8422532388-4">{</span><span·class="p"·data-group-id="8422532388-4">}</span><span·class="p">,</span><span·class="w">
254 ····</span><span·class="n">R1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R0</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="6483012726-5">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="n">Value</span><span·class="p"·data-group-id="6483012726-5">}</span><span·class="p">,</span><span·class="w">254 ····</span><span·class="n">R1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R0</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="8422532388-5">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="n">Value</span><span·class="p"·data-group-id="8422532388-5">}</span><span·class="p">,</span><span·class="w">
255 ····</span><span·class="n">R2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R1</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="6483012726-6">{</span><span·class="ss">b</span><span·class="o">=</span><span·class="mi">2</span><span·class="p"·data-group-id="6483012726-6">}</span><span·class="p">,</span><span·class="w">255 ····</span><span·class="n">R2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R1</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="8422532388-6">{</span><span·class="ss">b</span><span·class="o">=</span><span·class="mi">2</span><span·class="p"·data-group-id="8422532388-6">}</span><span·class="p">,</span><span·class="w">
256 ····</span><span·class="n">R2</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="6483012726-7">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="mi">3</span><span·class="p"·data-group-id="6483012726-7">}</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-18680·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7491"·title="">PR-7491</a>,·<a·href="https://github.com/erlang/otp/pull/8086"·title="">PR-8086</a>,·ERIERL-967</p></li><li><p>Improved·the·performance·of·the·alias·analysis·pass.</p><p>Own·Id:·OTP-18714·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7528"·title="">PR-7528</a>,·<a·href="https://github.com/erlang/otp/issues/7432"·title="">GH-7432</a></p></li><li><p><code·class="inline">-spec</code>·attributes·are·now·used·for·documentation.</p><p>Own·Id:·OTP-18801·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7739"·title="">PR-7739</a></p></li><li><p>Native·coverage·support·has·been·implemented·in·the·JIT.·It·will··automatically·be·used·by·the·<a·href="../../../../lib/tools-4.1.1/doc/html/cover.html"><code·class="inline">cover</code></a>·tool·to·reduce·the·execution·overhead·when·running·cover-compiled·code.</p><p>There·are·also·new·APIs·to·support·native·coverage·without·using·the·<code·class="inline">cover</code>·tool.</p><p>To·instrument·code·for·native·coverage·it·must·be·compiled·with·the·<a·href="compile.html#line_coverage"><code·class="inline">line_coverage</code></a>·option.</p><p>To·enable·native·coverage·in·the·runtime·system,·start·it·like·so:</p><pre><code·class="text">$·erl·+JPcover·true</code></pre><p>There·are·also·the·following·new·functions·for·supporting·native·coverage:</p><ul><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#coverage_support/0"><code·class="inline">code:coverage_support/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage/2"><code·class="inline">code:get_coverage/2</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#reset_coverage/1"><code·class="inline">code:reset_coverage/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/0"><code·class="inline">code:get_coverage_mode/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/1"><code·class="inline">code:get_coverage_mode/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#set_coverage_mode/1"><code·class="inline">code:set_coverage_mode/1</code></a></li></ul><p>Own·Id:·OTP-18856·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7856"·title="">PR-7856</a></p></li><li><p><a·href="https://www.erlang.org/eeps/eep-0059">EEP-59·-·Documentation·Attributes</a>·has·been·implemented.</p><p>Documentation·attributes·can·be·used·to·document·functions,·types,·callbacks,·and·modules.256 ····</span><span·class="n">R2</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="8422532388-7">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="mi">3</span><span·class="p"·data-group-id="8422532388-7">}</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-18680·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7491"·title="">PR-7491</a>,·<a·href="https://github.com/erlang/otp/pull/8086"·title="">PR-8086</a>,·ERIERL-967</p></li><li><p>Improved·the·performance·of·the·alias·analysis·pass.</p><p>Own·Id:·OTP-18714·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7528"·title="">PR-7528</a>,·<a·href="https://github.com/erlang/otp/issues/7432"·title="">GH-7432</a></p></li><li><p><code·class="inline">-spec</code>·attributes·are·now·used·for·documentation.</p><p>Own·Id:·OTP-18801·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7739"·title="">PR-7739</a></p></li><li><p>Native·coverage·support·has·been·implemented·in·the·JIT.·It·will··automatically·be·used·by·the·<a·href="../../../../lib/tools-4.1.1/doc/html/cover.html"><code·class="inline">cover</code></a>·tool·to·reduce·the·execution·overhead·when·running·cover-compiled·code.</p><p>There·are·also·new·APIs·to·support·native·coverage·without·using·the·<code·class="inline">cover</code>·tool.</p><p>To·instrument·code·for·native·coverage·it·must·be·compiled·with·the·<a·href="compile.html#line_coverage"><code·class="inline">line_coverage</code></a>·option.</p><p>To·enable·native·coverage·in·the·runtime·system,·start·it·like·so:</p><pre><code·class="text">$·erl·+JPcover·true</code></pre><p>There·are·also·the·following·new·functions·for·supporting·native·coverage:</p><ul><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#coverage_support/0"><code·class="inline">code:coverage_support/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage/2"><code·class="inline">code:get_coverage/2</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#reset_coverage/1"><code·class="inline">code:reset_coverage/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/0"><code·class="inline">code:get_coverage_mode/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/1"><code·class="inline">code:get_coverage_mode/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#set_coverage_mode/1"><code·class="inline">code:set_coverage_mode/1</code></a></li></ul><p>Own·Id:·OTP-18856·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7856"·title="">PR-7856</a></p></li><li><p><a·href="https://www.erlang.org/eeps/eep-0059">EEP-59·-·Documentation·Attributes</a>·has·been·implemented.</p><p>Documentation·attributes·can·be·used·to·document·functions,·types,·callbacks,·and·modules.
257 The·keyword·<code·class="inline">-moduledoc·&quot;Documentation·here&quot;.</code>·is·used·to·document·modules,·while·<code·class="inline">-doc·&quot;Documentation·here&quot;.</code>·can·be·used·on·top·of·functions,·types,·and·callbacks·to·document·them,·respectively.</p><ul><li><p>Types,·callbacks,·and·function·documentation·can·be·set·to·<code·class="inline">hidden</code>·either·via·<code·class="inline">-doc·false</code>·or·<code·class="inline">-doc·hidden</code>.·When·documentation·attributes·mark·a·type·as·hidden,·they·will·not·be·part·of·the·documentation.</p></li><li><p>The·documentation·from·<code·class="inline">moduledoc</code>·and·<code·class="inline">doc</code>·gets·added·by·default·to·the·binary·beam·file,·following·the·format·of·<a·href="https://www.erlang.org/eeps/eep-0048">EEP-48</a>.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_doc</code>·will·raise·a·warning·when257 The·keyword·<code·class="inline">-moduledoc·&quot;Documentation·here&quot;.</code>·is·used·to·document·modules,·while·<code·class="inline">-doc·&quot;Documentation·here&quot;.</code>·can·be·used·on·top·of·functions,·types,·and·callbacks·to·document·them,·respectively.</p><ul><li><p>Types,·callbacks,·and·function·documentation·can·be·set·to·<code·class="inline">hidden</code>·either·via·<code·class="inline">-doc·false</code>·or·<code·class="inline">-doc·hidden</code>.·When·documentation·attributes·mark·a·type·as·hidden,·they·will·not·be·part·of·the·documentation.</p></li><li><p>The·documentation·from·<code·class="inline">moduledoc</code>·and·<code·class="inline">doc</code>·gets·added·by·default·to·the·binary·beam·file,·following·the·format·of·<a·href="https://www.erlang.org/eeps/eep-0048">EEP-48</a>.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_doc</code>·will·raise·a·warning·when
258 <code·class="inline">-doc</code>·attributes·are·missing·in·exported·functions,·types,·and·callbacks.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_spec_documented</code>·will·raise·a·warning·when258 <code·class="inline">-doc</code>·attributes·are·missing·in·exported·functions,·types,·and·callbacks.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_spec_documented</code>·will·raise·a·warning·when
259 spec·attributes·are·missing·in·documented·functions,·types,·and·callbacks.</p></li><li><p><code·class="inline">moduledoc</code>s·and·<code·class="inline">doc</code>s·may·refer·to·external·files·to·be·embedded,·such·as·<code·class="inline">-doc·{file,·&quot;README.md&quot;}.</code>,·which·refers·to·the·file·<code·class="inline">README.md</code>·found·in·the·current·working·directory.</p></li><li><p>The·compiler·warns·about·exported·functions·whose·specs·refer·to·hidden·types.·Thus,·there·will·be·warnings·when·a·hidden·type·(meaning,·the·type·is·not·part·of·the·documentation)·gets·used·in·an·exported·function.</p></li></ul><p>Own·Id:·OTP-18916·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7936"·title="">PR-7936</a></p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>The·order·in·which·the·compiler·looks·up·options·has·changed.</p><p>When·there·is·a·conflict·in·the·compiler·options·given·in·the·<code·class="inline">-compile()</code>·attribute·and·options·given·to·the·compiler,·the·options·given·in·the·<code·class="inline">-compile()</code>·attribute·overrides·the·option·given·to·the·compiler,·which·in·turn·overrides·options·given·in·the·<code·class="inline">ERL_COMPILER_OPTIONS</code>·environment·variable.</p><p>Example:</p><p>If··<code·class="inline">some_module.erl</code>·has·the·following·attribute:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="6448238342-1">(</span><span·class="p"·data-group-id="6448238342-2">[</span><span·class="ss">nowarn_missing_spec</span><span·class="p"·data-group-id="6448238342-2">]</span><span·class="p"·data-group-id="6448238342-1">)</span><span·class="p">.</span></code><[·...·truncated·by·diffoscope;·len:·1215,·SHA:·8988fa58c2d38757c7a8cf817f51fdf476e473fbedf8db742814611a72daa89f·...·]-1">)</span><span·class="p">.</span><span·class="w">259 spec·attributes·are·missing·in·documented·functions,·types,·and·callbacks.</p></li><li><p><code·class="inline">moduledoc</code>s·and·<code·class="inline">doc</code>s·may·refer·to·external·files·to·be·embedded,·such·as·<code·class="inline">-doc·{file,·&quot;README.md&quot;}.</code>,·which·refers·to·the·file·<code·class="inline">README.md</code>·found·in·the·current·working·directory.</p></li><li><p>The·compiler·warns·about·exported·functions·whose·specs·refer·to·hidden·types.·Thus,·there·will·be·warnings·when·a·hidden·type·(meaning,·the·type·is·not·part·of·the·documentation)·gets·used·in·an·exported·function.</p></li></ul><p>Own·Id:·OTP-18916·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7936"·title="">PR-7936</a></p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>The·order·in·which·the·compiler·looks·up·options·has·changed.</p><p>When·there·is·a·conflict·in·the·compiler·options·given·in·the·<code·class="inline">-compile()</code>·attribute·and·options·given·to·the·compiler,·the·options·given·in·the·<code·class="inline">-compile()</code>·attribute·overrides·the·option·given·to·the·compiler,·which·in·turn·overrides·options·given·in·the·<code·class="inline">ERL_COMPILER_OPTIONS</code>·environment·variable.</p><p>Example:</p><p>If··<code·class="inline">some_module.erl</code>·has·the·following·attribute:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="8157670643-1">(</span><span·class="p"·data-group-id="8157670643-2">[</span><span·class="ss">nowarn_missing_spec</span><span·class="p"·data-group-id="8157670643-2">]</span><span·class="p"·data-group-id="8157670643-1">)</span><span·class="p">.</span></code><[·...·truncated·by·diffoscope;·len:·1215,·SHA:·f61c15d364b797e725b236648ffdc64b7039756b274e0d9cc6cbf6440597dc68·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
260 </span><span·class="nf">update</span><span·class="p"·data-group-id="5747809297-3">(</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5747809297-4">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">needs_update</span><span·class="p">,</span><span·class="ss">b</s[·...·truncated·by·diffoscope;·len:·195,·SHA:·bc0bddbd50fd6964405a67ad66816c1b02b7163bec506874288faabd2b236b8b·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">260 </span><span·class="nf">update</span><span·class="p"·data-group-id="9475587179-3">(</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="9475587179-4">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">needs_update</span><span·class="p">,</span><span·class="ss">b</s[·...·truncated·by·diffoscope;·len:·195,·SHA:·be8591f6c7449813b6145750ea76c25005657b7f2dfaa67fbb63d9bcf89351a6·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
261 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R0</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5747809297-5">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">up_to_date</span><span·class="p"·data-group-id="5747809297-5">}</span><span·class="p">,</span><span·class="w">261 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">R0</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="9475587179-5">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="ss">up_to_date</span><span·class="p"·data-group-id="9475587179-5">}</span><span·class="p">,</span><span·class="w">
262 ····</span><span·class="k">if</span><span·class="w">262 ····</span><span·class="k">if</span><span·class="w">
263 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">263 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
264 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5747809297-6">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">negative</span><span·class="p"·data-group-id="5747809297-6">}</span><span·class="p">;</span><span·class="w">264 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="9475587179-6">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">negative</span><span·class="p"·data-group-id="9475587179-6">}</span><span·class="p">;</span><span·class="w">
265 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">265 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
266 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5747809297-7">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">zero</span><span·class="p"·data-group-id="5747809297-7">}</span><span·class="p">;</span><span·class="w">266 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="9475587179-7">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">zero</span><span·class="p"·data-group-id="9475587179-7">}</span><span·class="p">;</span><span·class="w">
267 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">267 ········</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
268 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5747809297-8">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">positive</span><span·class="p"·data-group-id="5747809297-8">}</span><span·class="w">268 ············</span><span·class="n">R</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="9475587179-8">{</span><span·class="ss">c</span><span·class="o">=</span><span·class="ss">positive</span><span·class="p"·data-group-id="9475587179-8">}</span><span·class="w">
269 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·record·updates·in·each·of·the·three·clauses·of·the·<code·class="inline">if</code>·can·safely·be·done·in-place,·because·variable·<code·class="inline">R</code>·is·not·used·again.</p><p>Own·Id:·OTP-18972·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8090"·title="">PR-8090</a></p></li><li><p>Improved·the·match·context·reuse·optimization·slightly,·allowing·match·contexts·to·be·passed·as-is·to·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#bit_size/1"><code·class="inline">bit_size/1</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#byte_size/1"><code·class="inline">byte_size/1</code></a>.</p><p>Own·Id:·OTP-18987</p></li><li><p><a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_lint.html"><code·class="inline">erl_lint</code></a>·(and·by·extension·the·<a·href="compile.html"><code·class="inline">compiler</code></a>)·will·now·warn·for·code·using·deprecated·callbacks.</p><p>The·only·callback·currenly·deprecated·is·<code·class="inline">format_status/2</code>·in·<a·href="../../../../lib/stdlib-6.2.2/doc/html/gen_server.html#c:format_status/2"><code·class="inline">gen_server</code></a>,·<a·href="../../../../lib/stdlib-6.2.2/doc/html/gen_event.html#c:format_status/2"><code·class="inline">gen_event</code></a>·and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/gen_server.html#c:format_status/2"><code·class="inline">gen_statem</code></a>.</p><p>You·can·use·<code·class="inline">nowarn_deprecated_callback</code>·to·silence·the·warning.</p><p>Own·Id:·OTP-19010·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8205"·title="">PR-8205</a></p></li></ul><h2·id="compiler-8-4-3-2"·class="section-heading">269 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·record·updates·in·each·of·the·three·clauses·of·the·<code·class="inline">if</code>·can·safely·be·done·in-place,·because·variable·<code·class="inline">R</code>·is·not·used·again.</p><p>Own·Id:·OTP-18972·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8090"·title="">PR-8090</a></p></li><li><p>Improved·the·match·context·reuse·optimization·slightly,·allowing·match·contexts·to·be·passed·as-is·to·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#bit_size/1"><code·class="inline">bit_size/1</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#byte_size/1"><code·class="inline">byte_size/1</code></a>.</p><p>Own·Id:·OTP-18987</p></li><li><p><a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_lint.html"><code·class="inline">erl_lint</code></a>·(and·by·extension·the·<a·href="compile.html"><code·class="inline">compiler</code></a>)·will·now·warn·for·code·using·deprecated·callbacks.</p><p>The·only·callback·currenly·deprecated·is·<code·class="inline">format_status/2</code>·in·<a·href="../../../../lib/stdlib-6.2.2/doc/html/gen_server.html#c:format_status/2"><code·class="inline">gen_server</code></a>,·<a·href="../../../../lib/stdlib-6.2.2/doc/html/gen_event.html#c:format_status/2"><code·class="inline">gen_event</code></a>·and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/gen_server.html#c:format_status/2"><code·class="inline">gen_statem</code></a>.</p><p>You·can·use·<code·class="inline">nowarn_deprecated_callback</code>·to·silence·the·warning.</p><p>Own·Id:·OTP-19010·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8205"·title="">PR-8205</a></p></li></ul><h2·id="compiler-8-4-3-2"·class="section-heading">
270 ··<a·href="#compiler-8-4-3-2"·class="hover-link">270 ··<a·href="#compiler-8-4-3-2"·class="hover-link">
271 ····<i·class="ri-link-m"·aria-hidden="true"></i>271 ····<i·class="ri-link-m"·aria-hidden="true"></i>
272 ··</a>272 ··</a>
273 ··<span·class="text">Compiler·8.4.3.2</span>273 ··<span·class="text">Compiler·8.4.3.2</span>
274 </h2>274 </h2>
275 <h3·id="fixed-bugs-and-malfunctions-7"·class="section-heading">275 <h3·id="fixed-bugs-and-malfunctions-7"·class="section-heading">
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3195 ········Built·using3195 ········Built·using
3196 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3196 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3197 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3197 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3198 ······</p>3198 ······</p>
3199 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3199 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3200 ····</footer>3200 ····</footer>
3201 ··</div>3201 ··</div>
3202 </main>3202 </main>
3203 </div>3203 </div>
3204 <script>3204 <script>
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3206 ····mermaid.initialize({3206 ····mermaid.initialize({
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144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
153 ····mermaid.initialize({153 ····mermaid.initialize({
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138 ····<i·class="ri-link-m"·aria-hidden="true"></i>138 ····<i·class="ri-link-m"·aria-hidden="true"></i>
139 ··</a>139 ··</a>
140 ··<span·class="text">Syntax</span>140 ··<span·class="text">Syntax</span>
141 </h2>141 </h2>
142 <p>SSA·checks·are·embedded·in·the·source·code·as·comments·starting·with142 <p>SSA·checks·are·embedded·in·the·source·code·as·comments·starting·with
143 with·one·of·<code·class="inline">%ssa%</code>,·<code·class="inline">%%ssa%</code>·or·<code·class="inline">%%%ssa%</code>.·This·is·a·short143 with·one·of·<code·class="inline">%ssa%</code>,·<code·class="inline">%%ssa%</code>·or·<code·class="inline">%%%ssa%</code>.·This·is·a·short
144 introduction·the·syntax,·for·the·full·syntax·please·refer·to·the144 introduction·the·syntax,·for·the·full·syntax·please·refer·to·the
145 <code·class="inline">ssa_check_when_clause</code>·production·in·<code·class="inline">erl_parse.yrl</code>.</p><p>SSA·checks·can·be·placed·inside·any·Erlang·function,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t0</span><span·class="p"·data-group-id="5232821424-1">(</span><span·class="p"·data-group-id="5232821424-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">145 <code·class="inline">ssa_check_when_clause</code>·production·in·<code·class="inline">erl_parse.yrl</code>.</p><p>SSA·checks·can·be·placed·inside·any·Erlang·function,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t0</span><span·class="p"·data-group-id="3919985794-1">(</span><span·class="p"·data-group-id="3919985794-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
146 </span><span·class="c1">%ssa%·()·when·post_ssa_opt·-&gt;</span><span·class="w">146 </span><span·class="c1">%ssa%·()·when·post_ssa_opt·-&gt;</span><span·class="w">
147 </span><span·class="c1">%ssa%···ret(#{}).</span><span·class="w">147 </span><span·class="c1">%ssa%···ret(#{}).</span><span·class="w">
148 ··</span><span·class="p"·data-group-id="5232821424-2">#{</span><span·class="p"·data-group-id="5232821424-2">}</span><span·class="p">.</span></code></pre><p>will·check·that·<code·class="inline">t0/0</code>·returns·the·literal·<code·class="inline">#{}</code>.·If·we·want·to·check148 ··</span><span·class="p"·data-group-id="3919985794-2">#{</span><span·class="p"·data-group-id="3919985794-2">}</span><span·class="p">.</span></code></pre><p>will·check·that·<code·class="inline">t0/0</code>·returns·the·literal·<code·class="inline">#{}</code>.·If·we·want·to·check
149 that·a·function·returns·its·first·formal·parameter,·we·can·write:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t1</span><span·class="p"·data-group-id="0209551589-1">(</span><span·class="n">A</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">B</span><span·class="p"·data-group-id="0209551589-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">149 that·a·function·returns·its·first·formal·parameter,·we·can·write:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t1</span><span·class="p"·data-group-id="2341738991-1">(</span><span·class="n">A</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">B</span><span·class="p"·data-group-id="2341738991-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
150 </span><span·class="c1">%ssa%·(X,·_)·when·post_ssa_opt·-&gt;</span><span·class="w">150 </span><span·class="c1">%ssa%·(X,·_)·when·post_ssa_opt·-&gt;</span><span·class="w">
151 </span><span·class="c1">%ssa%···ret(X).</span><span·class="w">151 </span><span·class="c1">%ssa%···ret(X).</span><span·class="w">
152 ··</span><span·class="n">A</span><span·class="p">.</span></code></pre><p>Note·how·we·match·the·first·formal·parameter·using·<code·class="inline">X</code>.·The·reason·for152 ··</span><span·class="n">A</span><span·class="p">.</span></code></pre><p>Note·how·we·match·the·first·formal·parameter·using·<code·class="inline">X</code>.·The·reason·for
153 having·our·own·formal·parameters·for·the·SSA·check,·is·that·we·don't153 having·our·own·formal·parameters·for·the·SSA·check,·is·that·we·don't
154 want·to·introduce·new·identifiers·at·the·Erlang·level·to·support154 want·to·introduce·new·identifiers·at·the·Erlang·level·to·support
155 SSA-level·checks.·Consider·if·<code·class="inline">t1/2</code>·had·been·defined·as·<code·class="inline">t1([A|As],·B)</code>·we·would·have·had·to·introduce·a·new·identifier·for·the·aggregate155 SSA-level·checks.·Consider·if·<code·class="inline">t1/2</code>·had·been·defined·as·<code·class="inline">t1([A|As],·B)</code>·we·would·have·had·to·introduce·a·new·identifier·for·the·aggregate
156 value·<code·class="inline">[A|As]</code>.</p><p>The·full·syntax·for·a·SSA·check·clause·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="ss">expected</span><span·class="o">-</span><span·class="ss">result</span><span·class="o">&gt;</span><span·class="o">?</span><span·class="w">·</span><span·class="p"·data-group-id="0746723784-1">(</span><span·class="o">&lt;</span><span·class="ss">formals</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0746723784-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">pipeline</span><span·class="o">-</span><span·class="ss">location</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">checks</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">&#39;.&#39;</span></code></pre><p>where·<code·class="inline">&lt;expected-result&gt;</code>·can·be·one·of·<code·class="inline">pass</code>·(the·check·must156 value·<code·class="inline">[A|As]</code>.</p><p>The·full·syntax·for·a·SSA·check·clause·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="ss">expected</span><span·class="o">-</span><span·class="ss">result</span><span·class="o">&gt;</span><span·class="o">?</span><span·class="w">·</span><span·class="p"·data-group-id="3761382546-1">(</span><span·class="o">&lt;</span><span·class="ss">formals</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3761382546-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">pipeline</span><span·class="o">-</span><span·class="ss">location</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">checks</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">&#39;.&#39;</span></code></pre><p>where·<code·class="inline">&lt;expected-result&gt;</code>·can·be·one·of·<code·class="inline">pass</code>·(the·check·must
157 succeed),·<code·class="inline">fail</code>·and·<code·class="inline">xfail</code>·(the·check·must·fail).·Omitting157 succeed),·<code·class="inline">fail</code>·and·<code·class="inline">xfail</code>·(the·check·must·fail).·Omitting
158 <code·class="inline">&lt;expected-result&gt;</code>·is·parsed·as·an·implicit·<code·class="inline">pass</code>.</p><p><code·class="inline">&lt;formals&gt;</code>·is·a·comma-separated·list·of·variables.</p><p><code·class="inline">&lt;pipeline-location&gt;</code>·specifies·when·in·the·compiler·pipeline·to·run158 <code·class="inline">&lt;expected-result&gt;</code>·is·parsed·as·an·implicit·<code·class="inline">pass</code>.</p><p><code·class="inline">&lt;formals&gt;</code>·is·a·comma-separated·list·of·variables.</p><p><code·class="inline">&lt;pipeline-location&gt;</code>·specifies·when·in·the·compiler·pipeline·to·run
159 the·checks.·For·now·the·only·supported·value·for·<code·class="inline">&lt;pipeline-location&gt;</code>159 the·checks.·For·now·the·only·supported·value·for·<code·class="inline">&lt;pipeline-location&gt;</code>
160 is·<code·class="inline">post_ssa_opt</code>·which·runs·the·checks·after·the·<code·class="inline">ssa_opt</code>·pass.</p><p><code·class="inline">&lt;checks&gt;</code>·is·a·comma-separated·list·of·matches·against·the·BEAM·SSA160 is·<code·class="inline">post_ssa_opt</code>·which·runs·the·checks·after·the·<code·class="inline">ssa_opt</code>·pass.</p><p><code·class="inline">&lt;checks&gt;</code>·is·a·comma-separated·list·of·matches·against·the·BEAM·SSA
161 code.·For·non-flow-control·operations·the·syntax·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="ss">variable</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">operation</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8274213076-1">(</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">arguments</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8274213076-1">)</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">annotation</span><span·class="o">&gt;</span><span·class="o">?</span></code></pre><p>where·<code·class="inline">&lt;operation&gt;</code>·is·the·<code·class="inline">#b_set.op</code>·field·from·the·internal·SSA161 code.·For·non-flow-control·operations·the·syntax·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="ss">variable</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">operation</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9090259648-1">(</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">arguments</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9090259648-1">)</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">annotation</span><span·class="o">&gt;</span><span·class="o">?</span></code></pre><p>where·<code·class="inline">&lt;operation&gt;</code>·is·the·<code·class="inline">#b_set.op</code>·field·from·the·internal·SSA
162 representation.·BIFs·are·written·as·<code·class="inline">bif:&lt;atom&gt;</code>.</p><p><code·class="inline">&lt;arguments&gt;</code>·is·a·comma-separated·list·of·variables·or·literals.</p><p>For·flow·control·operations·and·labels,·the·syntax·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">br</span><span·class="p"·data-group-id="4785812970-1">(</span><span·class="o">&lt;</span><span·class="ss">bool</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">true</span><span·class="o">-</span><span·class="ss">label</s[·...·truncated·by·diffoscope;·len:·256,·SHA:·532ec3c6dbd06f5b46eda4238a366b5759ade3690341015efbb2c44b05a926bf·...·]-1">)</span><span·class="w">162 representation.·BIFs·are·written·as·<code·class="inline">bif:&lt;atom&gt;</code>.</p><p><code·class="inline">&lt;arguments&gt;</code>·is·a·comma-separated·list·of·variables·or·literals.</p><p>For·flow·control·operations·and·labels,·the·syntax·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">br</span><span·class="p"·data-group-id="5796805531-1">(</span><span·class="o">&lt;</span><span·class="ss">bool</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">true</span><span·class="o">-</span><span·class="ss">label</s[·...·truncated·by·diffoscope;·len:·256,·SHA:·6ab380d46b51fe44b844982c94bc2141878601099d82b95471100840458eaf2f·...·]-1">)</span><span·class="w">
  
163 </span><span·class="nf">switch</span><span·class="p"·data-group-id="4785812970-2">(</span><span·class="o">&lt;</span><span·class="ss">value</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">fail</span><span·class="o">-</span><span·class="ss">label</[·...·truncated·by·diffoscope;·len:·619,·SHA:·c8b430210901bd498cf028a12b54faa2e388f0b374a9fe0436a03b4165decb1b·...·]-2">)</span><span·class="w">163 </span><span·class="nf">switch</span><span·class="p"·data-group-id="5796805531-2">(</span><span·class="o">&lt;</span><span·class="ss">value</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">fail</span><span·class="o">-</span><span·class="ss">label</[·...·truncated·by·diffoscope;·len:·619,·SHA:·e13d288df2fa1e9eb85ed6ed04af1fdbf3521e85a4aab8a3147a7a31c05f1232·...·]-2">)</span><span·class="w">
  
164 </span><span·class="nf">ret</span><span·class="p"·data-group-id="4785812970-5">(</span><span·class="o">&lt;</span><span·class="ss">value</span><span·class="o">&gt;</span><span·class="p"·data-group-id="4785812970-5">)</span><span·class="w">164 </span><span·class="nf">ret</span><span·class="p"·data-group-id="5796805531-5">(</span><span·class="o">&lt;</span><span·class="ss">value</span><span·class="o">&gt;</span><span·class="p"·data-group-id="5796805531-5">)</span><span·class="w">
  
165 </span><span·class="ss">label</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">value</span><span·class="o">&gt;</span></code></pre><p>where·<code·class="inline">&lt;value&gt;</code>·is·a·literal·or·a·variable.</p><p>A·check·can·also·include·an·assertion·on·operation·annotations.·The165 </span><span·class="ss">label</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="ss">value</span><span·class="o">&gt;</span></code></pre><p>where·<code·class="inline">&lt;value&gt;</code>·is·a·literal·or·a·variable.</p><p>A·check·can·also·include·an·assertion·on·operation·annotations.·The
166 assertion·is·written·as·a·map-like·pattern·following·the·argument166 assertion·is·written·as·a·map-like·pattern·following·the·argument
167 list,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t0</span><span·class="p"·data-group-id="6096371785-1">(</span><span·class="p"·data-group-id="6096371785-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 list,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t0</span><span·class="p"·data-group-id="9172485682-1">(</span><span·class="p"·data-group-id="9172485682-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 </span><span·class="c1">%ssa%·()·when·post_ssa_opt·-&gt;</span><span·class="w">168 </span><span·class="c1">%ssa%·()·when·post_ssa_opt·-&gt;</span><span·class="w">
169 </span><span·class="c1">%ssa%·_·=·call(fun·return_int/0)·{·result_type·=&gt;·{t_integer,{17,17}},</span><span·class="w">169 </span><span·class="c1">%ssa%·_·=·call(fun·return_int/0)·{·result_type·=&gt;·{t_integer,{17,17}},</span><span·class="w">
170 </span><span·class="c1">%ssa%······························location·=&gt;·{_,32}·},</span><span·class="w">170 </span><span·class="c1">%ssa%······························location·=&gt;·{_,32}·},</span><span·class="w">
171 </span><span·class="c1">%ssa%·_·=·call(fun·return_tuple/0)·{</span><span·class="w">171 </span><span·class="c1">%ssa%·_·=·call(fun·return_tuple/0)·{</span><span·class="w">
172 </span><span·class="c1">%ssa%····result_type·=&gt;·{t_tuple,2,true,#{1·=&gt;·{t_integer,{1,1}},</span><span·class="w">172 </span><span·class="c1">%ssa%····result_type·=&gt;·{t_tuple,2,true,#{1·=&gt;·{t_integer,{1,1}},</span><span·class="w">
173 </span><span·class="c1">%ssa%·····································2·=&gt;·{t_integer,{2,2}}}}</span><span·class="w">173 </span><span·class="c1">%ssa%·····································2·=&gt;·{t_integer,{2,2}}}}</span><span·class="w">
174 </span><span·class="c1">%ssa%·}.</span><span·class="w">174 </span><span·class="c1">%ssa%·}.</span><span·class="w">
175 ····</span><span·class="n">X</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">return_int</span><span·class="p"·data-group-id="6096371785-2">(</span><span·class="p"·data-group-id="6096371785-2">)</span><span·class="p">,</span><span·class="w">175 ····</span><span·class="n">X</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">return_int</span><span·class="p"·data-group-id="9172485682-2">(</span><span·class="p"·data-group-id="9172485682-2">)</span><span·class="p">,</span><span·class="w">
176 ····</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">return_tuple</span><span·class="p"·data-group-id="6096371785-3">(</span><span·class="p"·data-group-id="6096371785-3">)</span><span·class="p">,</span><span·class="w">176 ····</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">return_tuple</span><span·class="p"·data-group-id="9172485682-3">(</span><span·class="p"·data-group-id="9172485682-3">)</span><span·class="p">,</span><span·class="w">
177 ····</span><span·class="p"·data-group-id="6096371785-4">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="6096371785-4">}</span><span·class="p">.</span></code></pre><h2·id="semantics"·class="section-heading">177 ····</span><span·class="p"·data-group-id="9172485682-4">{</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="9172485682-4">}</span><span·class="p">.</span></code></pre><h2·id="semantics"·class="section-heading">
178 ··<a·href="#semantics"·class="hover-link">178 ··<a·href="#semantics"·class="hover-link">
179 ····<i·class="ri-link-m"·aria-hidden="true"></i>179 ····<i·class="ri-link-m"·aria-hidden="true"></i>
180 ··</a>180 ··</a>
181 ··<span·class="text">Semantics</span>181 ··<span·class="text">Semantics</span>
182 </h2>182 </h2>
183 <p>When·an·SSA·assertion·is·matched·against·the·BEAM·SSA·for·a·function,183 <p>When·an·SSA·assertion·is·matched·against·the·BEAM·SSA·for·a·function,
184 patterns·are·applied·sequentially.·If·the·current·pattern·doesn't184 patterns·are·applied·sequentially.·If·the·current·pattern·doesn't
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246 ······<p·class="built-using">246 ······<p·class="built-using">
247 ········Built·using247 ········Built·using
248 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the248 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
249 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>249 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
250 ······</p>250 ······</p>
251 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>251 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
252 ····</footer>252 ····</footer>
253 ··</div>253 ··</div>
254 </main>254 </main>
255 </div>255 </div>
256 <script>256 <script>
257 ··function·mermaidLoaded()·{257 ··function·mermaidLoaded()·{
258 ····mermaid.initialize({258 ····mermaid.initialize({
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143 ······<p·class="built-using">143 ······<p·class="built-using">
144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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315 ······<p·class="built-using">315 ······<p·class="built-using">
316 ········Built·using316 ········Built·using
317 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the317 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
318 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>318 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
319 ······</p>319 ······</p>
320 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>320 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
321 ····</footer>321 ····</footer>
322 ··</div>322 ··</div>
323 </main>323 </main>
324 </div>324 </div>
325 <script>325 <script>
326 ··function·mermaidLoaded()·{326 ··function·mermaidLoaded()·{
327 ····mermaid.initialize({327 ····mermaid.initialize({
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182 ········Built·using182 ········Built·using
183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
185 ······</p>185 ······</p>
186 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>186 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
190 </div>190 </div>
191 <script>191 <script>
192 ··function·mermaidLoaded()·{192 ··function·mermaidLoaded()·{
193 ····mermaid.initialize({193 ····mermaid.initialize({
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591 ····<div·class="summary-row">591 ····<div·class="summary-row">
592 ······<div·class="summary-signature">592 ······<div·class="summary-signature">
593 ········<a·href="#t:rsa_params/0"·data-no-tooltip·translate="no">rsa_params()</a>593 ········<a·href="#t:rsa_params/0"·data-no-tooltip·translate="no">rsa_params()</a>
  
594 ······</div>594 ······</div>
  
595 ········<div·class="summary-synopsis"><pre><code·class="text">rsa_public()·=·[E,·N]</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rsa_private</span><span·class="p"·data-group-id="2089852715-1">(</span><span·class="p"·data-group-id="2089852715-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2089852715-2">[</span><span·class="n">E</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·863,·SHA:·96c6d2c7ab1099c8d130bcf599a7eade8c0facd2dcf45ea0c07b33b228cab1d0·...·]-3">]</span></code></pre><p>Where·E·is·the·public·exponent,·N·is·public·modulus·and·D·is·the·private595 ········<div·class="summary-synopsis"><pre><code·class="text">rsa_public()·=·[E,·N]</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rsa_private</span><span·class="p"·data-group-id="4727653533-1">(</span><span·class="p"·data-group-id="4727653533-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4727653533-2">[</span><span·class="n">E</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·863,·SHA:·55f0415426e5001087e483564ad6266eba52f5e9ea6ba3e2f8a228820e7e805a·...·]-3">]</span></code></pre><p>Where·E·is·the·public·exponent,·N·is·public·modulus·and·D·is·the·private
596 exponent.·The·longer·key·format·contains·redundant·information·that·will·make596 exponent.·The·longer·key·format·contains·redundant·information·that·will·make
597 the·calculation·faster.·P1·and·P2·are·first·and·second·prime·factors.·E1·and·E2597 the·calculation·faster.·P1·and·P2·are·first·and·second·prime·factors.·E1·and·E2
598 are·first·and·second·exponents.·C·is·the·CRT·coefficient.·The·terminology·is598 are·first·and·second·exponents.·C·is·the·CRT·coefficient.·The·terminology·is
599 taken·from·<a·href="http://www.ietf.org/rfc/rfc3447.txt">RFC·3447</a>.</p></div>599 taken·from·<a·href="http://www.ietf.org/rfc/rfc3447.txt">RFC·3447</a>.</p></div>
  
600 ····</div>600 ····</div>
  
Offset 3033, 15 lines modifiedOffset 3033, 15 lines modified
  
3033 ······<div·class="specs">3033 ······<div·class="specs">
  
3034 ··········<pre·translate="no"><span·class="attribute">-type</span>·rsa_params()·::·{ModulusSizeInBits·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·PublicExponent·::·<a·href="#t:key_integer/0">key_integer</a>()}.</pre>3034 ··········<pre·translate="no"><span·class="attribute">-type</span>·rsa_params()·::·{ModulusSizeInBits·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·PublicExponent·::·<a·href="#t:key_integer/0">key_integer</a>()}.</pre>
  
3035 ······</div>3035 ······</div>
  
3036 <pre><code·class="text">rsa_public()·=·[E,·N]</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rsa_private</span><span·class="p"·data-group-id="2089852715-1">(</span><span·class="p"·data-group-id="2089852715-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2089852715-2">[</span><span·class="n">E</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·863,·SHA:·96c6d2c7ab1099c8d130bcf599a7eade8c0facd2dcf45ea0c07b33b228cab1d0·...·]-3">]</span></code></pre><p>Where·E·is·the·public·exponent,·N·is·public·modulus·and·D·is·the·private3036 <pre><code·class="text">rsa_public()·=·[E,·N]</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">rsa_private</span><span·class="p"·data-group-id="4727653533-1">(</span><span·class="p"·data-group-id="4727653533-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4727653533-2">[</span><span·class="n">E</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·863,·SHA:·55f0415426e5001087e483564ad6266eba52f5e9ea6ba3e2f8a228820e7e805a·...·]-3">]</span></code></pre><p>Where·E·is·the·public·exponent,·N·is·public·modulus·and·D·is·the·private
3037 exponent.·The·longer·key·format·contains·redundant·information·that·will·make3037 exponent.·The·longer·key·format·contains·redundant·information·that·will·make
3038 the·calculation·faster.·P1·and·P2·are·first·and·second·prime·factors.·E1·and·E23038 the·calculation·faster.·P1·and·P2·are·first·and·second·prime·factors.·E1·and·E2
3039 are·first·and·second·exponents.·C·is·the·CRT·coefficient.·The·terminology·is3039 are·first·and·second·exponents.·C·is·the·CRT·coefficient.·The·terminology·is
3040 taken·from·<a·href="http://www.ietf.org/rfc/rfc3447.txt">RFC·3447</a>.</p>3040 taken·from·<a·href="http://www.ietf.org/rfc/rfc3447.txt">RFC·3447</a>.</p>
3041 ··</section>3041 ··</section>
3042 </section>3042 </section>
3043 <section·class="detail"·id="t:rsa_private/0">3043 <section·class="detail"·id="t:rsa_private/0">
Offset 5316, 17 lines modifiedOffset 5316, 17 lines modified
5316 ······</div>5316 ······</div>
  
5317 <p>Create·a·state·object·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html">random·number·generation</a>,·in·order·to5317 <p>Create·a·state·object·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html">random·number·generation</a>,·in·order·to
5318 generate·cryptographically·strong·random·numbers·(based·on·OpenSSL's5318 generate·cryptographically·strong·random·numbers·(based·on·OpenSSL's
5319 <code·class="inline">BN_rand_range</code>).</p><p>Saves·the·state·in·the·process·dictionary·before·returning·it·as5319 <code·class="inline">BN_rand_range</code>).</p><p>Saves·the·state·in·the·process·dictionary·before·returning·it·as
5320 well.·See·also·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html#seed/1"><code·class="inline">rand:seed/1</code></a>·and·<a·href="#rand_seed_s/0"><code·class="inline">rand_seed_s/0</code></a>.</p><p>When·using·the·state·object·from·this·function·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html"><code·class="inline">rand</code></a>·functions·using·it5320 well.·See·also·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html#seed/1"><code·class="inline">rand:seed/1</code></a>·and·<a·href="#rand_seed_s/0"><code·class="inline">rand_seed_s/0</code></a>.</p><p>When·using·the·state·object·from·this·function·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html"><code·class="inline">rand</code></a>·functions·using·it
5321 may·raise·exception·<code·class="inline">error:low_entropy</code>·in·case·the·random·generator·failed·due5321 may·raise·exception·<code·class="inline">error:low_entropy</code>·in·case·the·random·generator·failed·due
5322 to·lack·of·secure·&quot;randomness&quot;.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed</span><span·class="p"·data-group-id="5890847567-1">(</span><span·class="p"·data-group-id="5890847567-1">)</span><span·class="p">,</span><span·class="w">5322 to·lack·of·secure·&quot;randomness&quot;.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed</span><span·class="p"·data-group-id="5870028532-1">(</span><span·class="p"·data-group-id="5870028532-1">)</span><span·class="p">,</span><span·class="w">
5323 </span><span·class="p">_</span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5890847567-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="5890847567-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·[1;·42]</span><span·class="w">5323 </span><span·class="p">_</span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5870028532-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="5870028532-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·[1;·42]</span><span·class="w">
5324 </span><span·class="p">_</span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5890847567-3">(</span><span·class="p"·data-group-id="5890847567-3">)</span><span·class="p">.</span><span·class="w">·····</span><span·class="c1">%·[0.0;·1.0[</span></code></pre>5324 </span><span·class="p">_</span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5870028532-3">(</span><span·class="p"·data-group-id="5870028532-3">)</span><span·class="p">.</span><span·class="w">·····</span><span·class="c1">%·[0.0;·1.0[</span></code></pre>
5325 ··</section>5325 ··</section>
5326 </section>5326 </section>
5327 <section·class="detail"·id="rand_seed/1">5327 <section·class="detail"·id="rand_seed/1">
  
5328 ··<div·class="detail-header">5328 ··<div·class="detail-header">
5329 ····<a·href="#rand_seed/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">5329 ····<a·href="#rand_seed/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
5330 ······<i·class="ri-link-m"·aria-hidden="true"></i>5330 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 5380, 17 lines modifiedOffset 5380, 17 lines modified
  
5380 ······</div>5380 ······</div>
  
5381 <p>Create·a·state·object·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html">random·number·generation</a>,·in·order·to5381 <p>Create·a·state·object·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html">random·number·generation</a>,·in·order·to
5382 generate·cryptographically·strong·random·numbers.</p><p>Saves·the·state·in·the·process·dictionary·before·returning·it·as·well.·See·also5382 generate·cryptographically·strong·random·numbers.</p><p>Saves·the·state·in·the·process·dictionary·before·returning·it·as·well.·See·also
5383 <a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html#seed/1"><code·class="inline">rand:seed/1</code></a>·and·<a·href="#rand_seed_alg_s/1"><code·class="inline">rand_seed_alg_s/1</code></a>.</p><p>When·using·the·state·object·from·this·function·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html"><code·class="inline">rand</code></a>·functions·using·it5383 <a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html#seed/1"><code·class="inline">rand:seed/1</code></a>·and·<a·href="#rand_seed_alg_s/1"><code·class="inline">rand_seed_alg_s/1</code></a>.</p><p>When·using·the·state·object·from·this·function·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html"><code·class="inline">rand</code></a>·functions·using·it
5384 may·raise·exception·<code·class="inline">error:low_entropy</code>·in·case·the·random·generator·failed·due5384 may·raise·exception·<code·class="inline">error:low_entropy</code>·in·case·the·random·generator·failed·due
5385 to·lack·of·secure·&quot;randomness&quot;.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed_alg</span><span·class="p"·data-group-id="1112499214-1">(</span><span·class="ss">crypto_cache</span><span·class="p"·data-group-id="1112499214-1">)</span><span·class="p">,</span><span·class="w">5385 to·lack·of·secure·&quot;randomness&quot;.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed_alg</span><span·class="p"·data-group-id="6940467259-1">(</span><span·class="ss">crypto_cache</span><span·class="p"·data-group-id="6940467259-1">)</span><span·class="p">,</span><span·class="w">
5386 </span><span·class="p">_</span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="1112499214-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="1112499214-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·[1;·42]</span><span·class="w">5386 </span><span·class="p">_</span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="6940467259-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="6940467259-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·[1;·42]</span><span·class="w">
5387 </span><span·class="p">_</span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="1112499214-3">(</span><span·class="p"·data-group-id="1112499214-3">)</span><span·class="p">.</span><span·class="w">·····</span><span·class="c1">%·[0.0;·1.0[</span></code></pre>5387 </span><span·class="p">_</span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="6940467259-3">(</span><span·class="p"·data-group-id="6940467259-3">)</span><span·class="p">.</span><span·class="w">·····</span><span·class="c1">%·[0.0;·1.0[</span></code></pre>
5388 ··</section>5388 ··</section>
5389 </section>5389 </section>
5390 <section·class="detail"·id="rand_seed_alg/2">5390 <section·class="detail"·id="rand_seed_alg/2">
  
5391 ··<div·class="detail-header">5391 ··<div·class="detail-header">
5392 ····<a·href="#rand_seed_alg/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">5392 ····<a·href="#rand_seed_alg/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
5393 ······<i·class="ri-link-m"·aria-hidden="true"></i>5393 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 5412, 20 lines modifiedOffset 5412, 20 lines modified
  
5412 ··········<pre·translate="no"><span·class="attribute">-spec</span>·rand_seed_alg(Alg·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),·Seed·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·{<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html#t:alg_handler/0">rand:alg_handler</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>()·|·<a·href="#t:rand_cache_seed/0">rand_cache_seed</a>()}.</pre>5412 ··········<pre·translate="no"><span·class="attribute">-spec</span>·rand_seed_alg(Alg·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),·Seed·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·{<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html#t:alg_handler/0">rand:alg_handler</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>()·|·<a·href="#t:rand_cache_seed/0">rand_cache_seed</a>()}.</pre>
  
5413 ······</div>5413 ······</div>
  
5414 <p>Creates·a·state·object·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html">random·number·generation</a>,·in·order·to5414 <p>Creates·a·state·object·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/rand.html">random·number·generation</a>,·in·order·to
5415 generate·cryptographically·unpredictable·random·numbers.</p><p>Saves·the·state·in·the·process·dictionary·before·returning·it·as·well.·See·also5415 generate·cryptographically·unpredictable·random·numbers.</p><p>Saves·the·state·in·the·process·dictionary·before·returning·it·as·well.·See·also
5416 <a·href="#rand_seed_alg_s/2"><code·class="inline">rand_seed_alg_s/2</code></a>.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed_alg</span><span·class="p"·data-group-id="2625695291-1">(</span><span·class="ss">crypto_aes</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my·seed&quot;</span><span·class="p"·data-group-id="2625695291-1">)</span><span·class="p">,</span><span·class="w">5416 <a·href="#rand_seed_alg_s/2"><code·class="inline">rand_seed_alg_s/2</code></a>.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed_alg</span><span·class="p"·data-group-id="5887836430-1">(</span><span·class="ss">crypto_aes</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my·seed&quot;</span><span·class="p"·data-group-id="5887836430-1">)</span><span·class="p">,</span><span·class="w">
5417 </span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="2625695291-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="2625695291-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·[1;·42]</span><span·class="w">5417 </span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5887836430-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="5887836430-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·[1;·42]</span><span·class="w">
5418 </span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="2625695291-3">(</span><span·class="p"·data-group-id="2625695291-3">)</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%·[0.0;·1.0[</span><span·class="w">5418 </span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5887836430-3">(</span><span·class="p"·data-group-id="5887836430-3">)</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%·[0.0;·1.0[</span><span·class="w">
5419 </span><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed_alg</span><span·class="p"·data-group-id="2625695291-4">(</span><span·class="ss">crypto_aes</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my·seed&quot;</span><span·class="p"·data-group-id="2625695291-4">)</span><span·class="p">,</span><span·class="w">5419 </span><span·class="p">_</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">rand_seed_alg</span><span·class="p"·data-group-id="5887836430-4">(</span><span·class="ss">crypto_aes</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my·seed&quot;</span><span·class="p"·data-group-id="5887836430-4">)</span><span·class="p">,</span><span·class="w">
5420 </span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="2625695291-5">(</span><span·class="mi">42</span><span·class="p"·data-group-id="2625695291-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Same·values</span><span·class="w">5420 </span><span·class="n">IntegerValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5887836430-5">(</span><span·class="mi">42</span><span·class="p"·data-group-id="5887836430-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Same·values</span><span·class="w">
5421 </span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="2625695291-6">(</span><span·class="p"·data-group-id="2625695291-6">)</span><span·class="p">.</span><span·class="w">·····</span><span·class="c1">%·again</span></code></pre>5421 </span><span·class="n">FloatValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="5887836430-6">(</span><span·class="p"·data-group-id="5887836430-6">)</span><span·class="p">.</span><span·class="w">·····</span><span·class="c1">%·again</span></code></pre>
5422 ··</section>5422 ··</section>
5423 </section>5423 </section>
5424 <section·class="detail"·id="rand_seed_alg_s/1">5424 <section·class="detail"·id="rand_seed_alg_s/1">
  
5425 ··<div·class="detail-header">5425 ··<div·class="detail-header">
5426 ····<a·href="#rand_seed_alg_s/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">5426 ····<a·href="#rand_seed_alg_s/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
5427 ······<i·class="ri-link-m"·aria-hidden="true"></i>5427 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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5886 ················cryptolib_version_compiled·=>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·undefined,5886 ················cryptolib_version_compiled·=>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·undefined,
5887 ················cryptolib_version_linked·:=·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),5887 ················cryptolib_version_linked·:=·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
5888 ················link_type·:=·dynamic·|·static,5888 ················link_type·:=·dynamic·|·static,
5889 ················otp_crypto_version·:=·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()}.</pre>5889 ················otp_crypto_version·:=·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()}.</pre>
  
5890 ······</div>5890 ······</div>
  
5891 <p>Get·information·about·crypto·and·the·OpenSSL·backend.</p><p>Returns·a·map·with·information·about·the·compilation·and·linking·of·crypto.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="3562296655-1">(</span><span·class="p"·data-group-id="3562296655-1">)</span><span·class="p">.</span><span·class="w">5891 <p>Get·information·about·crypto·and·the·OpenSSL·backend.</p><p>Returns·a·map·with·information·about·the·compilation·and·linking·of·crypto.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="6883405657-1">(</span><span·class="p"·data-group-id="6883405657-1">)</span><span·class="p">.</span><span·class="w">
5892 </span><span·class="p"·data-group-id="3562296655-2">#{</span><span·class="ss">compile_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">5892 </span><span·class="p"·data-group-id="6883405657-2">#{</span><span·class="ss">compile_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">
5893 ··</span><span·class="ss">cryptolib_version_compiled</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;OpenSSL·3.0.0·7·sep·2021&quot;</span><span·class="p">,</span><span·class="w">5893 ··</span><span·class="ss">cryptolib_version_compiled</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;OpenSSL·3.0.0·7·sep·2021&quot;</span><span·class="p">,</span><span·class="w">
5894 ··</span><span·class="ss">cryptolib_version_linked</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;OpenSSL·3.0.0·7·sep·2021&quot;</span><span·class="p">,</span><span·class="w">5894 ··</span><span·class="ss">cryptolib_version_linked</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;OpenSSL·3.0.0·7·sep·2021&quot;</span><span·class="p">,</span><span·class="w">
5895 ··</span><span·class="ss">link_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">dynamic</span><span·class="p">,</span><span·class="w">5895 ··</span><span·class="ss">link_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">dynamic</span><span·class="p">,</span><span·class="w">
5896 ··</span><span·class="ss">otp_crypto_version</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;5.0.2&quot;</span><span·class="p"·data-group-id="3562296655-2">}</span><span·class="w">5896 ··</span><span·class="ss">otp_crypto_version</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;5.0.2&quot;</span><span·class="p"·data-group-id="6883405657-2">}</span><span·class="w">
5897 </span><span·class="mi">2</span><span·class="o">&gt;</span></code></pre><p>More·association·types·than·documented·may·be·present·in·the·map.</p>5897 </span><span·class="mi">2</span><span·class="o">&gt;</span></code></pre><p>More·association·types·than·documented·may·be·present·in·the·map.</p>
5898 ··</section>5898 ··</section>
5899 </section>5899 </section>
5900 <section·class="detail"·id="info_fips/0">5900 <section·class="detail"·id="info_fips/0">
  
5901 ··<div·class="detail-header">5901 ··<div·class="detail-header">
5902 ····<a·href="#info_fips/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">5902 ····<a·href="#info_fips/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 5954, 16 lines modifiedOffset 5954, 16 lines modified
5954 ··········<pre·translate="no"><span·class="attribute">-spec</span>·info_lib()·->·[{Name,·VerNum,·VerStr}]5954 ··········<pre·translate="no"><span·class="attribute">-spec</span>·info_lib()·->·[{Name,·VerNum,·VerStr}]
5955 ··················when·Name·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·VerNum·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·VerStr·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>5955 ··················when·Name·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·VerNum·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·VerStr·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>
  
5956 ······</div>5956 ······</div>
  
5957 <p>Get·the·name·and·version·of·the·libraries·used·by·crypto.</p><p><code·class="inline">Name</code>·is·the·name·of·the·library.·<code·class="inline">VerNum</code>·is·the·numeric·version·according·to5957 <p>Get·the·name·and·version·of·the·libraries·used·by·crypto.</p><p><code·class="inline">Name</code>·is·the·name·of·the·library.·<code·class="inline">VerNum</code>·is·the·numeric·version·according·to
5958 the·library's·own·versioning·scheme.·<code·class="inline">VerStr</code>·contains·a·text·variant·of·the5958 the·library's·own·versioning·scheme.·<code·class="inline">VerStr</code>·contains·a·text·variant·of·the
5959 version.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">info_lib</span><span·class="p"·data-group-id="6806992479-1">(</span><span·class="p"·data-group-id="6806992479-1">)</span><span·class="p">.</span><span·class="w">5959 version.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">info_lib</span><span·class="p"·data-group-id="2380721835-1">(</span><span·class="p"·data-group-id="2380721835-1">)</span><span·class="p">.</span><span·class="w">
5960 </span><span·class="p"·data-group-id="6806992479-2">[</span><span·class="p"·data-group-id="6806992479-3">{</span><span·class="p"·data-group-id="6806992479-4">&lt;&lt;</span><span·class="s">&quot;OpenSSL&quot;</span><span·class="p"·data-group-id="6806992479-4">&gt;&gt;</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·367,·SHA:·f1c67c5fc41831818921a157f9b58167c112a0d403916099b55202cdeb87d987·...·]-2">]</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>From·OTP·R16·the·<em>numeric·version</em>·represents·the·version·of·the·OpenSSL5960 </span><span·class="p"·data-group-id="2380721835-2">[</span><span·class="p"·data-group-id="2380721835-3">{</span><span·class="p"·data-group-id="2380721835-4">&lt;&lt;</span><span·class="s">&quot;OpenSSL&quot;</span><span·class="p"·data-group-id="2380721835-4">&gt;&gt;</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·367,·SHA:·1f7b47ac64bb37cc7333f3c10ddb882611912db2f1a977ee0f8ac89a6679813a·...·]-2">]</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>From·OTP·R16·the·<em>numeric·version</em>·represents·the·version·of·the·OpenSSL
5961 <em>header·files</em>·(<code·class="inline">openssl/opensslv.h</code>)·used·when·crypto·was·compiled.·The·text5961 <em>header·files</em>·(<code·class="inline">openssl/opensslv.h</code>)·used·when·crypto·was·compiled.·The·text
5962 variant·represents·the·libcrypto·library·used·at·runtime.·In·earlier·OTP5962 variant·represents·the·libcrypto·library·used·at·runtime.·In·earlier·OTP
5963 versions·both·numeric·and·text·was·taken·from·the·library.</p></section>5963 versions·both·numeric·and·text·was·taken·from·the·library.</p></section>
5964 ··</section>5964 ··</section>
5965 </section>5965 </section>
5966 <section·class="detail"·id="mod_pow/3">5966 <section·class="detail"·id="mod_pow/3">
  
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221 ······<p·class="built-using">221 ······<p·class="built-using">
222 ········Built·using222 ········Built·using
223 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the223 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
224 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>224 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
225 ······</p>225 ······</p>
226 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>226 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
227 ····</footer>227 ····</footer>
228 ··</div>228 ··</div>
229 </main>229 </main>
230 </div>230 </div>
231 <script>231 <script>
232 ··function·mermaidLoaded()·{232 ··function·mermaidLoaded()·{
233 ····mermaid.initialize({233 ····mermaid.initialize({
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157 <h3·id="sign-with-an-engine-stored-private-key"·class="section-heading">157 <h3·id="sign-with-an-engine-stored-private-key"·class="section-heading">
158 ··<a·href="#sign-with-an-engine-stored-private-key"·class="hover-link">158 ··<a·href="#sign-with-an-engine-stored-private-key"·class="hover-link">
159 ····<i·class="ri-link-m"·aria-hidden="true"></i>159 ····<i·class="ri-link-m"·aria-hidden="true"></i>
160 ··</a>160 ··</a>
161 ··<span·class="text">Sign·with·an·engine·stored·private·key</span>161 ··<span·class="text">Sign·with·an·engine·stored·private·key</span>
162 </h3>162 </h3>
163 <p>This·example·shows·how·to·construct·a·key·reference·that·is·used·in·a·sign163 <p>This·example·shows·how·to·construct·a·key·reference·that·is·used·in·a·sign
164 operation.·The·actual·key·is·stored·in·the·engine·that·is·loaded·at·prompt·1.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="9647504435-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p"·data-group-id="9647504435-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·276,·SHA:·c960db2a0c6ae17b2f01967690de4467044e7f53e10be78baa135a76425e22b7·...·]-2">)</span><span·class="p">.</span><span·class="w">164 operation.·The·actual·key·is·stored·in·the·engine·that·is·loaded·at·prompt·1.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="6624219759-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p"·data-group-id="6624219759-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·276,·SHA:·35356d11ab4b80e434d6105b692c4e901a018d8c81946555b67d829d06366c02·...·]-2">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">165 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
166 </span><span·class="p"·data-group-id="9647504435-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2399045421</span><span·class="p">.</span><span·class="mf">3028942852.173962</span><span·[·...·truncated·by·diffoscope;·len:·62,·SHA:·7fbba77b9303f0b1e15244d7b2e8326cfc5706956cbea07347c8051968de6b6f·...·]-3">}</span><span·class="gp·unselectable">166 </span><span·class="p"·data-group-id="6624219759-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2399045421</span><span·class="p">.</span><span·class="mf">3028942852.173962</span><span·[·...·truncated·by·diffoscope;·len:·62,·SHA:·151c47d07082a80a1f188cdd36e6c78ebfef95837d17979b2764dff307fd110e·...·]-3">}</span><span·class="gp·unselectable">
167 2&gt;·</span><span·class="n">PrivKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9647504435-4">#{</span><span·class="ss">engine</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p">,</span><span·class="w">167 2&gt;·</span><span·class="n">PrivKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6624219759-4">#{</span><span·class="ss">engine</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p">,</span><span·class="w">
168 ···············</span><span·class="ss">key_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;id·of·the·private·key·in·Engine&quot;</span><span·class="p"·data-group-id="9647504435-4">}</span><span·class="p">.</span><span·class="w">168 ···············</span><span·class="ss">key_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;id·of·the·private·key·in·Engine&quot;</span><span·class="p"·data-group-id="6624219759-4">}</span><span·class="p">.</span><span·class="w">
169 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">169 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
170 3&gt;·</span><span·class="n">Signature</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">sign</span><span·class="p"·data-group-id="9647504435-5">(</span><span·class="ss">rsa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9647504435-6">&lt;&lt;</span><span·class="s">&quot;Th[·...·truncated·by·diffoscope;·len:·201,·SHA:·dd1c5ab0f2f2d1287f4369d85e955a1d64fd35b4862db01dab8b37431f5cfc06·...·]-5">)</span><span·class="p">.</span><span·class="w">170 3&gt;·</span><span·class="n">Signature</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">sign</span><span·class="p"·data-group-id="6624219759-5">(</span><span·class="ss">rsa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6624219759-6">&lt;&lt;</span><span·class="s">&quot;Th[·...·truncated·by·diffoscope;·len:·201,·SHA:·705385b0f78ca85e647dcb39d7ef014299faa77615dbea5d006997962d009d0b·...·]-5">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="p"·data-group-id="9647504435-7">&lt;&lt;</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">125</span><span·class="p">,</span><span·class="mi">254</span><span·class="p">,</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">233</span><span·class="p">,</span><span·class="mi">84</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">63</span><span·class="p">,</span><span·class="mi">168</span><span·class="p">,</span><span·class="mi">28</span><span·class="p">,</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">214</span><span·class="p">,</span><span·class="mi">121</span><span·class="p">,</span><span·class="mi">76</span><span·class="p">,</span><span·class="w">171 </span><span·class="p"·data-group-id="6624219759-7">&lt;&lt;</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">125</span><span·class="p">,</span><span·class="mi">254</span><span·class="p">,</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">233</span><span·class="p">,</span><span·class="mi">84</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">63</span><span·class="p">,</span><span·class="mi">168</span><span·class="p">,</span><span·class="mi">28</span><span·class="p">,</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">214</span><span·class="p">,</span><span·class="mi">121</span><span·class="p">,</span><span·class="mi">76</span><span·class="p">,</span><span·class="w">
172 ··</span><span·class="mi">207</span><span·class="p">,</span><span·class="mi">177</span><span·class="p">,</span><span·class="mi">124</span><span·class="p">,</span><span·class="mi">183</span><span·class="p">,</span><span·class="mi">156</span><span·class="p">,</span><span·class="mi">185</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">243</span><span·class="p">,</span><span·class="mi">36</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">125</span><span·class="p">,</span><span·class="mi">230</span><span·class="p">,</span><span·class="mi">231</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9647504435-7">&gt;&gt;</span></code></pre><h3·id="verify-with-an-engine-stored-public-key"·class="section-heading">172 ··</span><span·class="mi">207</span><span·class="p">,</span><span·class="mi">177</span><span·class="p">,</span><span·class="mi">124</span><span·class="p">,</span><span·class="mi">183</span><span·class="p">,</span><span·class="mi">156</span><span·class="p">,</span><span·class="mi">185</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">243</span><span·class="p">,</span><span·class="mi">36</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">125</span><span·class="p">,</span><span·class="mi">230</span><span·class="p">,</span><span·class="mi">231</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="6624219759-7">&gt;&gt;</span></code></pre><h3·id="verify-with-an-engine-stored-public-key"·class="section-heading">
173 ··<a·href="#verify-with-an-engine-stored-public-key"·class="hover-link">173 ··<a·href="#verify-with-an-engine-stored-public-key"·class="hover-link">
174 ····<i·class="ri-link-m"·aria-hidden="true"></i>174 ····<i·class="ri-link-m"·aria-hidden="true"></i>
175 ··</a>175 ··</a>
176 ··<span·class="text">Verify·with·an·engine·stored·public·key</span>176 ··<span·class="text">Verify·with·an·engine·stored·public·key</span>
177 </h3>177 </h3>
178 <p>Here·the·signature·and·message·in·the·last·example·is·verifyed·using·the·public178 <p>Here·the·signature·and·message·in·the·last·example·is·verifyed·using·the·public
179 key.·The·public·key·is·stored·in·an·engine,·only·to·exemplify·that·it·is179 key.·The·public·key·is·stored·in·an·engine,·only·to·exemplify·that·it·is
180 possible.·The·public·key·could·of·course·be·handled·openly·as·usual.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="n">PublicKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2391956997-1">#{</span><span·class="ss">engine</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p">,</span><span·class="w">180 possible.·The·public·key·could·of·course·be·handled·openly·as·usual.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="n">PublicKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2418151467-1">#{</span><span·class="ss">engine</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p">,</span><span·class="w">
181 ·················</span><span·class="ss">key_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;id·of·the·public·key·in·Engine&quot;</span><span·class="p"·data-group-id="2391956997-1">}</span><span·class="p">.</span><span·class="w">181 ·················</span><span·class="ss">key_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;id·of·the·public·key·in·Engine&quot;</span><span·class="p"·data-group-id="2418151467-1">}</span><span·class="p">.</span><span·class="w">
182 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">182 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
183 5&gt;·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">verify</span><span·class="p"·data-group-id="2391956997-2">(</span><span·class="ss">rsa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2391956997-3">&lt;&lt;</span><span·class="s">&quot;The[·...·truncated·by·diffoscope;·len:·281,·SHA:·9c7cba4b7625d72376c13df256fe11797d680b654b22d9f5bd311ee6bfc629ea·...·]7-2">)</span><span·class="p">.</span><span·class="w">183 5&gt;·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">verify</span><span·class="p"·data-group-id="2418151467-2">(</span><span·class="ss">rsa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2418151467-3">&lt;&lt;</span><span·class="s">&quot;The[·...·truncated·by·diffoscope;·len:·281,·SHA:·afa1b575f4fe4add25589ef7e39f8e96a731bfd234edfde4cafba676f238e23a·...·]7-2">)</span><span·class="p">.</span><span·class="w">
184 </span><span·class="ss">true</span><span·class="w">184 </span><span·class="ss">true</span><span·class="w">
185 </span><span·class="mi">6</span><span·class="o">&gt;</span></code></pre><h3·id="using-a-password-protected-private-key"·class="section-heading">185 </span><span·class="mi">6</span><span·class="o">&gt;</span></code></pre><h3·id="using-a-password-protected-private-key"·class="section-heading">
186 ··<a·href="#using-a-password-protected-private-key"·class="hover-link">186 ··<a·href="#using-a-password-protected-private-key"·class="hover-link">
187 ····<i·class="ri-link-m"·aria-hidden="true"></i>187 ····<i·class="ri-link-m"·aria-hidden="true"></i>
188 ··</a>188 ··</a>
189 ··<span·class="text">Using·a·password·protected·private·key</span>189 ··<span·class="text">Using·a·password·protected·private·key</span>
190 </h3>190 </h3>
191 <p>The·same·example·as·the·first·sign·example,·except·that·a·password·protects·the191 <p>The·same·example·as·the·first·sign·example,·except·that·a·password·protects·the
192 key·down·in·the·Engine.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="n">PrivKeyPwd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3344336645-1">#{</span><span·class="ss">engine</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p">,</span><span·class="w">192 key·down·in·the·Engine.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="n">PrivKeyPwd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0734772053-1">#{</span><span·class="ss">engine</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">EngineRef</span><span·class="p">,</span><span·class="w">
193 ··················</span><span·class="ss">key_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;id·of·the·pwd·protected·private·key·in·Engine&quot;</span><span·class="p">,</span><span·class="w">193 ··················</span><span·class="ss">key_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;id·of·the·pwd·protected·private·key·in·Engine&quot;</span><span·class="p">,</span><span·class="w">
194 »       »       ··</span><span·class="ss">password</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;password&quot;</span><span·class="p"·data-group-id="3344336645-1">}</span><span·class="p">.</span><span·class="w">194 »       »       ··</span><span·class="ss">password</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;password&quot;</span><span·class="p"·data-group-id="0734772053-1">}</span><span·class="p">.</span><span·class="w">
195 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">195 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
196 7&gt;·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">sign</span><span·class="p"·data-group-id="3344336645-2">(</span><span·class="ss">rsa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3344336645-3">&lt;&lt;</span><span·class="s">&quot;Th[·...·truncated·by·diffoscope;·len:·204,·SHA:·299deb320284d2e0d675444fcff9ffebc713d6f460a9a3c7c275106f69ec304c·...·]-2">)</span><span·class="p">.</span><span·class="w">196 7&gt;·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">sign</span><span·class="p"·data-group-id="0734772053-2">(</span><span·class="ss">rsa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0734772053-3">&lt;&lt;</span><span·class="s">&quot;Th[·...·truncated·by·diffoscope;·len:·204,·SHA:·da85aedae06569060e2e63c293a2d11c83bd46c3413a6045c96588496f9a6180·...·]-2">)</span><span·class="p">.</span><span·class="w">
197 </span><span·class="p"·data-group-id="3344336645-4">&lt;&lt;</span><span·class="mi">140</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">168</span><span·class="p">,</span><span·class="mi">101</span><span·class="p">,</span><span·class="mi">234</span><span·class="p">,</span><span·class="mi">211</span><span·class="p">,</span><span·class="mi">146</span><span·class="p">,</span><span·class="mi">183</span><span·class="p">,</span><span·class="mi">231</span><span·class="p">,</span><span·class="mi">190</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">85</span><span·class="p">,</span><span·class="mi">163</span><span·class="p">,</span><span·class="w">197 </span><span·class="p"·data-group-id="0734772053-4">&lt;&lt;</span><span·class="mi">140</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">168</span><span·class="p">,</span><span·class="mi">101</span><span·class="p">,</span><span·class="mi">234</span><span·class="p">,</span><span·class="mi">211</span><span·class="p">,</span><span·class="mi">146</span><span·class="p">,</span><span·class="mi">183</span><span·class="p">,</span><span·class="mi">231</span><span·class="p">,</span><span·class="mi">190</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">85</span><span·class="p">,</span><span·class="mi">163</span><span·class="p">,</span><span·class="w">
198 ··</span><span·class="mi">175</span><span·class="p">,</span><span·class="mi">106</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">241</span><span·class="p">,</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">120</span><span·class="p">,</span><span·class="mi">72</span><span·class="p">,</span><span·class="mi">149</span><span·class="p">,</span><span·class="mi">181</span><span·class="p">,</span><span·class="mi">181</span><span·class="p">,</span><span·class="mi">194</span><span·class="p">,</span><span·class="mi">154</span><span·class="p">,</span><span·class="mi">175</span><span·class="p">,</span><span·class="mi">76</span><span·class="p">,</span><span·class="w">198 ··</span><span·class="mi">175</span><span·class="p">,</span><span·class="mi">106</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">241</span><span·class="p">,</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">120</span><span·class="p">,</span><span·class="mi">72</span><span·class="p">,</span><span·class="mi">149</span><span·class="p">,</span><span·class="mi">181</span><span·class="p">,</span><span·class="mi">181</span><span·class="p">,</span><span·class="mi">194</span><span·class="p">,</span><span·class="mi">154</span><span·class="p">,</span><span·class="mi">175</span><span·class="p">,</span><span·class="mi">76</span><span·class="p">,</span><span·class="w">
199 ··</span><span·class="mi">223</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3344336645-4">&gt;&gt;</span><span·class="w">199 ··</span><span·class="mi">223</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0734772053-4">&gt;&gt;</span><span·class="w">
200 </span><span·class="mi">8</span><span·class="o">&gt;</span></code></pre>200 </span><span·class="mi">8</span><span·class="o">&gt;</span></code></pre>
201 </div>201 </div>
  
202 <div·class="bottom-actions"·id="bottom-actions">202 <div·class="bottom-actions"·id="bottom-actions">
203 ··<div·class="bottom-actions-item">203 ··<div·class="bottom-actions-item">
  
204 ······<a·href="engine_load.html"·class="bottom-actions-button"·rel="prev">204 ······<a·href="engine_load.html"·class="bottom-actions-button"·rel="prev">
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244 ······<p·class="built-using">244 ······<p·class="built-using">
245 ········Built·using245 ········Built·using
246 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the246 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
247 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>247 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
248 ······</p>248 ······</p>
249 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>249 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
250 ····</footer>250 ····</footer>
251 ··</div>251 ··</div>
252 </main>252 </main>
253 </div>253 </div>
254 <script>254 <script>
255 ··function·mermaidLoaded()·{255 ··function·mermaidLoaded()·{
256 ····mermaid.initialize({256 ····mermaid.initialize({
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148 <h3·id="dynamically-load-an-engine-from-default-directory"·class="section-heading">148 <h3·id="dynamically-load-an-engine-from-default-directory"·class="section-heading">
149 ··<a·href="#dynamically-load-an-engine-from-default-directory"·class="hover-link">149 ··<a·href="#dynamically-load-an-engine-from-default-directory"·class="hover-link">
150 ····<i·class="ri-link-m"·aria-hidden="true"></i>150 ····<i·class="ri-link-m"·aria-hidden="true"></i>
151 ··</a>151 ··</a>
152 ··<span·class="text">Dynamically·load·an·engine·from·default·directory</span>152 ··<span·class="text">Dynamically·load·an·engine·from·default·directory</span>
153 </h3>153 </h3>
154 <p>If·the·engine·is·located·in·the·OpenSSL/LibreSSL·installation·<code·class="inline">engines</code>154 <p>If·the·engine·is·located·in·the·OpenSSL/LibreSSL·installation·<code·class="inline">engines</code>
155 directory.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="7609661911-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</span><span·class="p"·data-group-id="7609661911-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_load</span><span·class="p"·data-group-id="7609661911-2">(</span><span·class="p"·data-group-id="7609661911-3">&lt;&lt;</span><span·class="s">&quot;otp_test_engine&quot;</span><span·class="p"·data-group-id="7609661911-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7609661911-4">[</span><span·class="p"·data-group-id="7609661911-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7609661911-5">[</span><span·class="p"·data-group-id="7609661911-5">]</span><span·class="p"·data-group-id="7609661911-2">)</span><span·class="p">.</span><span·class="w"> 
156 ·</span><span·class="p"·data-group-id="7609661911-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="7609661911-6">}</span></code></pre><h3·i[·...·truncated·by·diffoscope;·len:·65,·SHA:·6843b29c2536b654e20e52263252797b98ab356d5b1d426f542309cac7f8a9e7·...·]">155 directory.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="6731719672-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</[·...·truncated·by·diffoscope;·len:·841,·SHA:·5eb6f3a999880d22bede07c64dfb5a55f28302dd4de6fdd70c6377a1d8af03ab·...·]">
 156 ·</span><span·class="p"·data-group-id="6731719672-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="6731719672-6">}</span></code></pre><h3·id="load-an-engine-with-the-dynamic-engine"·class="section-heading">
157 ··<a·href="#load-an-engine-with-the-dynamic-engine"·class="hover-link">157 ··<a·href="#load-an-engine-with-the-dynamic-engine"·class="hover-link">
158 ····<i·class="ri-link-m"·aria-hidden="true"></i>158 ····<i·class="ri-link-m"·aria-hidden="true"></i>
159 ··</a>159 ··</a>
160 ··<span·class="text">Load·an·engine·with·the·dynamic·engine</span>160 ··<span·class="text">Load·an·engine·with·the·dynamic·engine</span>
161 </h3>161 </h3>
162 <p>Load·an·engine·with·the·help·of·the·dynamic·engine·by·giving·the·path·to·the162 <p>Load·an·engine·with·the·help·of·the·dynamic·engine·by·giving·the·path·to·the
163 library.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6829970844-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</span><span·class="p"·data-group-id="6829970844-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·279,·SHA:·98240444933fe996ef9d5c175a633f5fbfbab2caf989395346597ccad62d9b9b·...·]-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">163 library.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4964022889-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</span><span·class="p"·data-group-id="4964022889-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·279,·SHA:·8a592b657c82ab563dbc40626fb47a8e4ac67be3ee6606698bfaaee06b8d1622·...·]-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">
164 ······································</span><span·class="p"·data-group-id="6829970844-4">[</span><span·class="p"·data-group-id="6829970844-5">{</span><span·class="p"·data-group-id="6829970844-6">&lt;&lt;</span><span·class="s">&quot;SO_PATH&quot;</span><span·class="p"·data-group-id="6829970844-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">164 ······································</span><span·class="p"·data-group-id="4964022889-4">[</span><span·class="p"·data-group-id="4964022889-5">{</span><span·class="p"·data-group-id="4964022889-6">&lt;&lt;</span><span·class="s">&quot;SO_PATH&quot;</span><span·class="p"·data-group-id="4964022889-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">
165 ········································</span><span·class="p"·data-group-id="6829970844-7">&lt;&lt;</span><span·class="s">&quot;/some/path/otp_test_engine.so&quot;</span><span·class="p"·data-group-id="6829970844-7">&gt;&gt;</span><span·class="p"·data-group-id="6829970844-5">}</span><span·class="p">,</span><span·class="w">165 ········································</span><span·class="p"·data-group-id="4964022889-7">&lt;&lt;</span><span·class="s">&quot;/some/path/otp_test_engine.so&quot;</span><span·class="p"·data-group-id="4964022889-7">&gt;&gt;</span><span·class="p"·data-group-id="4964022889-5">}</span><span·class="p">,</span><span·class="w">
166 ·······································</span><span·class="p"·data-group-id="6829970844-8">{</span><span·class="p"·data-group-id="6829970844-9">&lt;&lt;</span><span·class="s">&quot;ID&quot;</span><span·class="p"·data-group-id="6829970844-9">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·172,·SHA:·e81da14af41d11c2fe1cae46bc88b167357af9cecf6ed24764ed4577e50937ef·...·]-8">}</span><span·class="p">,</span><span·class="w">166 ·······································</span><span·class="p"·data-group-id="4964022889-8">{</span><span·class="p"·data-group-id="4964022889-9">&lt;&lt;</span><span·class="s">&quot;ID&quot;</span><span·class="p"·data-group-id="4964022889-9">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·172,·SHA:·4f5067493452e035bb23139e02c66d9e0db4af534676ff3750726d4327e361d2·...·]-8">}</span><span·class="p">,</span><span·class="w">
167 ·······································</span><span·class="p"·data-group-id="6829970844-11">&lt;&lt;</span><span·class="s">&quot;LOAD&quot;</span><span·class="p"·data-group-id="6829970844-11">&gt;&gt;</span><span·class="p"·data-group-id="6829970844-4">]</span><span·class="p">,</span><span·class="w">167 ·······································</span><span·class="p"·data-group-id="4964022889-11">&lt;&lt;</span><span·class="s">&quot;LOAD&quot;</span><span·class="p"·data-group-id="4964022889-11">&gt;&gt;</span><span·class="p"·data-group-id="4964022889-4">]</span><span·class="p">,</span><span·class="w">
168 ······································</span><span·class="p"·data-group-id="6829970844-12">[</span><span·class="p"·data-group-id="6829970844-12">]</span><span·class="p"·data-group-id="6829970844-2">)</span><span·class="p">.</span><span·class="w">168 ······································</span><span·class="p"·data-group-id="4964022889-12">[</span><span·class="p"·data-group-id="4964022889-12">]</span><span·class="p"·data-group-id="4964022889-2">)</span><span·class="p">.</span><span·class="w">
169 ·</span><span·class="p"·data-group-id="6829970844-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="6829970844-13">}</span></code></pre><h3·id="load-an-engine-and-replace-some-methods"·class="section-heading">169 ·</span><span·class="p"·data-group-id="4964022889-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="4964022889-13">}</span></code></pre><h3·id="load-an-engine-and-replace-some-methods"·class="section-heading">
170 ··<a·href="#load-an-engine-and-replace-some-methods"·class="hover-link">170 ··<a·href="#load-an-engine-and-replace-some-methods"·class="hover-link">
171 ····<i·class="ri-link-m"·aria-hidden="true"></i>171 ····<i·class="ri-link-m"·aria-hidden="true"></i>
172 ··</a>172 ··</a>
173 ··<span·class="text">Load·an·engine·and·replace·some·methods</span>173 ··<span·class="text">Load·an·engine·and·replace·some·methods</span>
174 </h3>174 </h3>
175 <p>Load·an·engine·with·the·help·of·the·dynamic·engine·and·just·replace·some·engine175 <p>Load·an·engine·with·the·help·of·the·dynamic·engine·and·just·replace·some·engine
176 methods.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5138296509-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</span><span·class="p"·data-group-id="5138296509-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_load</span><span·class="p"·data-group-id="5138296509-2">(</span><span·class="p"·data-group-id="5138296509-3">&lt;&lt;</span><span·class="s">&quot;dynamic&quot;</span><span·class="p"·data-group-id="5138296509-3">&gt;&gt;</span><span·class="p">,</span><span·class="w"> 
177 ······································</span><span·class="p"·data-group-id="5138296509-4">[</span><span·class="p"·data-group-id="5138296509-5">{</span><span·class="p"·data-group-id="5138296509-6">&lt;&lt;</span><span·class="s">&quot;SO_PATH&quot;</span><sp[·...·truncated·by·diffoscope;·len:·40,·SHA:·dd911421296f2a56e1b2d48ab3155eea745292760561a09c5839d05f052a3331·...·]">&gt;&gt;</span><span·class="p">,</span><span·class="w">176 methods.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2618474200-1">{</span><span·class="ss">ok</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·472,·SHA:·2d199cdb6601039007f90ee7540376179afbcb88e98bdea13ec647ca8ba80836·...·]">&gt;&gt;</span><span·class="p">,</span><span·class="w">
 177 ······································</span><span·class="p"·data-group-id="2618474200-4">[</span><span·class="p"·data-group-id="2618474200-5">{</span><span·class="p"·data-group-id="2618474200-6">&lt;&lt;</span><span·class="s">&quot;SO_PATH&quot;</span><span·class="p"·data-group-id="2618474200-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">
178 ········································</span><span·class="p"·data-group-id="5138296509-7">&lt;&lt;</span><span·class="s">&quot;/some/path/otp_test_engine.so&quot;</span><span·class="p"·data-group-id="5138296509-7">&gt;&gt;</span><span·class="p"·data-group-id="5138296509-5">}</span><span·class="p">,</span><span·class="w">178 ········································</span><span·class="p"·data-group-id="2618474200-7">&lt;&lt;</span><span·class="s">&quot;/some/path/otp_test_engine.so&quot;</span><span·class="p"·data-group-id="2618474200-7">&gt;&gt;</span><span·class="p"·data-group-id="2618474200-5">}</span><span·class="p">,</span><span·class="w">
179 ·······································</span><span·class="p"·data-group-id="5138296509-8">{</span><span·class="p"·data-group-id="5138296509-9">&lt;&lt;</span><span·class="s">&quot;ID&quot;</span><span·class="p"·data-group-id="5138296509-9">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5138296509-10">&lt;&lt;</span><span·class="s">&quot;MD5&quot;</span><span·class="p"·data-group-id="5138296509-10">&gt;&gt;</span><span·class="p"·data-group-id="5138296509-8">}</span><span·class="p">,</span><span·class="w"> 
180 ·······································</span><span·class="p"·data-group-id="5138296509-11">&lt;&lt;</span><span·class="s">&quot;LOAD&quot;</span><span·class="p"·data-group-id="5138296509-11">&gt;&gt;</span><span·class="p"·data-group-id="5138296509-4">]</span><span·class="p">,</span><span·class="w">179 ·······································</span><span·class="p"·data-group-id="2618474200-8">{</span><span·class="p"·data-group-id="2618474200-9">&lt;&lt;</span><span·class="s">&quot;ID&quot;</span><span·class="p"·data-group-id="2618474200-9">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·177,·SHA:·0fbb45f1a26cf9eede992f243b9c0aff16e78315b91161a85c90ff643d2b5646·...·]</span><span·class="p">,</span><span·class="w">
 180 ·······································</span><span·class="p"·data-group-id="2618474200-11">&lt;&lt;</span><span·class="s">&quot;LOAD&quot;</span><span·class="p"·data-group-id="2618474200-11">&gt;&gt;</span><span·class="p"·data-group-id="2618474200-4">]</span><span·class="p">,</span><span·class="w">
181 ······································</span><span·class="p"·data-group-id="5138296509-12">[</span><span·class="p"·data-group-id="5138296509-12">]</span><span·class="p"·data-group-id="5138296509-2">)</span><span·class="p">.</span><span·class="w">181 ······································</span><span·class="p"·data-group-id="2618474200-12">[</span><span·class="p"·data-group-id="2618474200-12">]</span><span·class="p"·data-group-id="2618474200-2">)</span><span·class="p">.</span><span·class="w">
182 </span><span·class="p"·data-group-id="5138296509-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="5138296509-13">}</span><span·class="gp·unselectable">182 </span><span·class="p"·data-group-id="2618474200-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="2618474200-13">}</span><span·class="gp·unselectable">
183 4&gt;·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_register</span><span·class="p"·data-group-id="5138296509-14">(</span><span·class="n">Engine</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5138296509-15">[</span><span·class="ss">engine_method_digests</span><span·class="p"·data-group-id="5138296509-15">]</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·cee5079c16a826e4156e1672217c8887b447be99d93ee2ce40848bc9f2fddc46·...·]-14">)</span><span·class="p">.</span><span·class="w">183 4&gt;·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_register</span><span·class="p"·data-group-id="2618474200-14">(</span><span·class="n">Engine</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2618474200-15">[</span><span·class="ss">engine_method_digests</span><span·class="p"·data-group-id="2618474200-15">]</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·e8a5f9678e459707907e5e9f42e5d1d21425c43d61f6e7d5a048d5ce75b4a315·...·]-14">)</span><span·class="p">.</span><span·class="w">
184 </span><span·class="ss">ok</span></code></pre><h3·id="load-with-the-ensure-loaded-function"·class="section-heading">184 </span><span·class="ss">ok</span></code></pre><h3·id="load-with-the-ensure-loaded-function"·class="section-heading">
185 ··<a·href="#load-with-the-ensure-loaded-function"·class="hover-link">185 ··<a·href="#load-with-the-ensure-loaded-function"·class="hover-link">
186 ····<i·class="ri-link-m"·aria-hidden="true"></i>186 ····<i·class="ri-link-m"·aria-hidden="true"></i>
187 ··</a>187 ··</a>
188 ··<span·class="text">Load·with·the·ensure·loaded·function</span>188 ··<span·class="text">Load·with·the·ensure·loaded·function</span>
189 </h3>189 </h3>
190 <p>This·function·makes·sure·the·engine·is·loaded·just·once·and·the·ID·is·added·to190 <p>This·function·makes·sure·the·engine·is·loaded·just·once·and·the·ID·is·added·to
191 the·internal·engine·list·of·OpenSSL.·The·following·calls·to·the·function·will191 the·internal·engine·list·of·OpenSSL.·The·following·calls·to·the·function·will
192 check·if·the·ID·is·loaded·and·then·just·get·a·new·reference·to·the·engine.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5827833548-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</span><span·class="p"·data-group-id="5827833548-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·284,·SHA:·20ab6f2e7bacb373ba5950e8ee9182a1cf20682083dc96f219e323555ea8a40a·...·]-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">192 check·if·the·ID·is·loaded·and·then·just·get·a·new·reference·to·the·engine.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8350142532-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Engine</span><span·class="p"·data-group-id="8350142532-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·284,·SHA:·bf9314e97d1ff4446697f32702366fc3d645ab719fcd0f1be31b139c3c069ac5·...·]-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">
193 ···············································</span><span·class="p"·data-group-id="5827833548-4">&lt;&lt;</span><span·class="s">&quot;/some/path/otp_test_engine.so&quot;</span><span·class="p"·data-group-id="5827833548-4">&gt;&gt;</span><span·class="p"·data-group-id="5827833548-2">)</span><span·class="p">.</span><span·class="w">193 ···············································</span><span·class="p"·data-group-id="8350142532-4">&lt;&lt;</span><span·class="s">&quot;/some/path/otp_test_engine.so&quot;</span><span·class="p"·data-group-id="8350142532-4">&gt;&gt;</span><span·class="p"·data-group-id="8350142532-2">)</span><span·class="p">.</span><span·class="w">
194 ·</span><span·class="p"·data-group-id="5827833548-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="5827833548-5">}</span></code></pre><p>To·remove·the·tag·from·the·OpenSSL·engine[·...·truncated·by·diffoscope;·len:·469,·SHA:·48e837446653523c9037b803645d634c249b7990b5eade75a158af814645106f·...·]-1">)</span><span·class="p">.</span><span·class="w">194 ·</span><span·class="p"·data-group-id="8350142532-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">#</span><span·class="n">Ref</span><span·class="p"·data-group-id="8350142532-5">}</span></code></pre><p>To·remove·the·tag·from·the·OpenSSL·engine[·...·truncated·by·diffoscope;·len:·469,·SHA:·6407bdbbb3e2d8aa89954bffc886028dbd73ce1f71c22fa5d7e9cfd3799bdc35·...·]-1">)</span><span·class="p">.</span><span·class="w">
195 ·</span><span·class="ss">ok</span></code></pre><p>To·unload·it·use·<a·href="crypto.html#engine_unload/1"><code·class="inline">crypto:engine_unload/1</code></a>·which·removes·the·references·to·the195 ·</span><span·class="ss">ok</span></code></pre><p>To·unload·it·use·<a·href="crypto.html#engine_unload/1"><code·class="inline">crypto:engine_unload/1</code></a>·which·removes·the·references·to·the
196 engine.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_unload</span><span·class="p"·data-group-id="2223594926-1">(</span><span·class="n">Engine</span><span·class="p"·data-group-id="2223594926-1">)</span><span·class="p">.</span><span·class="w">196 engine.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_unload</span><span·class="p"·data-group-id="6294797693-1">(</span><span·class="n">Engine</span><span·class="p"·data-group-id="6294797693-1">)</span><span·class="p">.</span><span·class="w">
197 ·</span><span·class="ss">ok</span></code></pre><h3·id="list-all-engines-currently-loaded"·class="section-heading">197 ·</span><span·class="ss">ok</span></code></pre><h3·id="list-all-engines-currently-loaded"·class="section-heading">
198 ··<a·href="#list-all-engines-currently-loaded"·class="hover-link">198 ··<a·href="#list-all-engines-currently-loaded"·class="hover-link">
199 ····<i·class="ri-link-m"·aria-hidden="true"></i>199 ····<i·class="ri-link-m"·aria-hidden="true"></i>
200 ··</a>200 ··</a>
201 ··<span·class="text">List·all·engines·currently·loaded</span>201 ··<span·class="text">List·all·engines·currently·loaded</span>
202 </h3>202 </h3>
203 <pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_list</span><span·class="p"·data-group-id="0304065381-1">(</span><span·class="p"·data-group-id="0304065381-1">)</span><span·class="p">.</span><span·class="w">203 <pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">engine_list</span><span·class="p"·data-group-id="5261177446-1">(</span><span·class="p"·data-group-id="5261177446-1">)</span><span·class="p">.</span><span·class="w">
204 </span><span·class="p"·data-group-id="0304065381-2">[</span><span·class="p"·data-group-id="0304065381-3">&lt;&lt;</span><span·class="s">&quot;dynamic&quot;</span><span·class="p"·data-group-id="0304065381-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·175,·SHA:·8a1d2adaccc43819db84eb4d435d8816c1a3db9e094f385d31193774799d298f·...·]-2">]</span></code></pre>204 </span><span·class="p"·data-group-id="5261177446-2">[</span><span·class="p"·data-group-id="5261177446-3">&lt;&lt;</span><span·class="s">&quot;dynamic&quot;</span><span·class="p"·data-group-id="5261177446-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·175,·SHA:·3f98419d3a971ba10a5125e06c7353e7aefd672a04246a986590843c98dea6ea·...·]-2">]</span></code></pre>
205 </div>205 </div>
  
206 <div·class="bottom-actions"·id="bottom-actions">206 <div·class="bottom-actions"·id="bottom-actions">
207 ··<div·class="bottom-actions-item">207 ··<div·class="bottom-actions-item">
  
208 ······<a·href="fips.html"·class="bottom-actions-button"·rel="prev">208 ······<a·href="fips.html"·class="bottom-actions-button"·rel="prev">
209 ········<span·class="subheader">209 ········<span·class="subheader">
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248 ······<p·class="built-using">248 ······<p·class="built-using">
249 ········Built·using249 ········Built·using
250 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the250 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
251 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>251 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
252 ······</p>252 ······</p>
253 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>253 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
254 ····</footer>254 ····</footer>
255 ··</div>255 ··</div>
256 </main>256 </main>
257 </div>257 </div>
258 <script>258 <script>
259 ··function·mermaidLoaded()·{259 ··function·mermaidLoaded()·{
260 ····mermaid.initialize({260 ····mermaid.initialize({
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290 ········Built·using290 ········Built·using
291 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the291 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
292 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>292 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
293 ······</p>293 ······</p>
294 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>294 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
295 ····</footer>295 ····</footer>
296 ··</div>296 ··</div>
297 </main>297 </main>
298 </div>298 </div>
299 <script>299 <script>
300 ··function·mermaidLoaded()·{300 ··function·mermaidLoaded()·{
301 ····mermaid.initialize({301 ····mermaid.initialize({
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293 ········Built·using293 ········Built·using
294 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the294 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
295 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>295 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
296 ······</p>296 ······</p>
297 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>297 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
298 ····</footer>298 ····</footer>
299 ··</div>299 ··</div>
300 </main>300 </main>
301 </div>301 </div>
302 <script>302 <script>
303 ··function·mermaidLoaded()·{303 ··function·mermaidLoaded()·{
304 ····mermaid.initialize({304 ····mermaid.initialize({
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188 </h3>188 </h3>
189 <p>The·functions·<a·href="crypto.html#crypto_init/4">crypto_init/4</a>·and189 <p>The·functions·<a·href="crypto.html#crypto_init/4">crypto_init/4</a>·and
190 <a·href="crypto.html#crypto_update/2">crypto_update/2</a>·are·intended·to·be·used·for190 <a·href="crypto.html#crypto_update/2">crypto_update/2</a>·are·intended·to·be·used·for
191 encrypting·or·decrypting·a·sequence·of·blocks.·First·one·call·of·<code·class="inline">crypto_init/4</code>191 encrypting·or·decrypting·a·sequence·of·blocks.·First·one·call·of·<code·class="inline">crypto_init/4</code>
192 initialises·the·crypto·context.·One·or·more·calls·<code·class="inline">crypto_update/2</code>·does·the192 initialises·the·crypto·context.·One·or·more·calls·<code·class="inline">crypto_update/2</code>·does·the
193 actual·encryption·or·decryption·for·each·block.</p><p>This·example·shows·first·the·encryption·of·two·blocks·and·then·decryptions·of193 actual·encryption·or·decryption·for·each·block.</p><p>This·example·shows·first·the·encryption·of·two·blocks·and·then·decryptions·of
194 the·cipher·text,·but·divided·into·three·blocks·just·to·show·that·it·is·possible194 the·cipher·text,·but·divided·into·three·blocks·just·to·show·that·it·is·possible
195 to·divide·the·plain·text·and·cipher·text·differently·for·some·ciphers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»    </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1065829486-1">(</span><span·class="p"·data-group-id="1065829486-1">)</span><span·class="p">.</span><span·class="w">195 to·divide·the·plain·text·and·cipher·text·differently·for·some·ciphers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»    </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8194287065-1">(</span><span·class="p"·data-group-id="8194287065-1">)</span><span·class="p">.</span><span·class="w">
196 »       </span><span·class="ss">ok</span><span·class="w">196 »       </span><span·class="ss">ok</span><span·class="w">
197 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="1065829486-2">&gt;&gt;</span><span·class="p">.</span><span·class="w">197 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="8194287065-2">&gt;&gt;</span><span·class="p">.</span><span·class="w">
198 »       </span><span·class="p"·data-group-id="1065829486-3">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·ee02f17daf45043c3d19ebdc792faa1d4be23e5c0fd0153b4389a0806a4234eb·...·]-3">&gt;&gt;</span><span·class="w">198 »       </span><span·class="p"·data-group-id="8194287065-3">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·bbdb4fcfdcb8bee2b5dbdf11e1c9a356fd9f308cb3697272b543676d95876c43·...·]-3">&gt;&gt;</span><span·class="w">
199 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">IV</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-4">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="1065829486-4">&gt;&gt;</span><span·class="p">.</span><span·class="w">199 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">IV</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-4">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="8194287065-4">&gt;&gt;</span><span·class="p">.</span><span·class="w">
200 »       </span><span·class="p"·data-group-id="1065829486-5">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·f5512c3663427aa3c8092d5afc5e0887ba52f6891df074f2a4c62bf740af0280·...·]-5">&gt;&gt;</span><span·class="w">200 »       </span><span·class="p"·data-group-id="8194287065-5">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·94a1bafefc1058669669f6c71d3bf372fd9080f856c8c507fbd60c75c3518bd9·...·]-5">&gt;&gt;</span><span·class="w">
201 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">StateEnc</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_init</span><span·class="p"·data-group-id="1065829486-6">(</span><span·class="ss">aes_128_ctr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·65,·SHA:·650b64b5b8994eb09acaa12ce9eac548fcd4b6ef1a3034b43c3c66a90b36179f·...·]-6">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·encrypt·-&gt;·true</span><span·class="w">201 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">StateEnc</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_init</span><span·class="p"·data-group-id="8194287065-6">(</span><span·class="ss">aes_128_ctr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·65,·SHA:·5f3fc56d1c8e604fa4736861f746a045ea0e788d04217c2d1c70be06a7ef5427·...·]-6">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·encrypt·-&gt;·true</span><span·class="w">
202 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.3768901617</span><span·class="p">.</span><span·class="mf">1128660993.124047</span><span·class="o">&gt;</span><span·class="w">202 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.3768901617</span><span·class="p">.</span><span·class="mf">1128660993.124047</span><span·class="o">&gt;</span><span·class="w">
203 »       </span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="1065829486-7">(</span><span·class="n">StateEnc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-8">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="1065829486-8">&gt;[·...·truncated·by·diffoscope;·len:·52,·SHA:·b6beb95681f611b6c409ec95cebb52ec81ffc1e636f25bb347d0cc224e6c7438·...·]-7">)</span><span·class="p">.</span><span·class="w">203 »       </span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="8194287065-7">(</span><span·class="n">StateEnc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-8">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="8194287065-8">&gt;[·...·truncated·by·diffoscope;·len:·52,·SHA:·84fefbb829ca33bb0fed4861737ea32c19d23518415a4123ead4eb915cf0f3e3·...·]-7">)</span><span·class="p">.</span><span·class="w">
204 »       </span><span·class="p"·data-group-id="1065829486-9">&lt;&lt;</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">44</span><span·class="p">,</span><span·class="mi">216</span><span·class="p">,</span><span·class="mi">166</span><span·class="p">,</span><span·class="mi">25</span[·...·truncated·by·diffoscope;·len:·343,·SHA:·8f7443e4e4f8068e4d98da19cca74f4558e5fd9599a2641d54569366bca52e4b·...·]-9">&gt;&gt;</span><span·class="w">204 »       </span><span·class="p"·data-group-id="8194287065-9">&lt;&lt;</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">44</span><span·class="p">,</span><span·class="mi">216</span><span·class="p">,</span><span·class="mi">166</span><span·class="p">,</span><span·class="mi">25</span[·...·truncated·by·diffoscope;·len:·343,·SHA:·47312a283e590a9029ecc6f87c7249663e8022afe927319f72bb292b12b036e7·...·]-9">&gt;&gt;</span><span·class="w">
205 »       </span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="1065829486-10">(</span><span·class="n">StateEnc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-11">&lt;&lt;</span><span·class="s">&quot;Second·bytes&quot;</span><span·class="p"·data-group-id="1065829486-11">[·...·truncated·by·diffoscope;·len:·56,·SHA:·7b8ae784d912aaa5eb0aff957c3e9103b68c318f3fa006d06ab3bbdf220dbdca·...·]-10">)</span><span·class="p">.</span><span·class="w">205 »       </span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="8194287065-10">(</span><span·class="n">StateEnc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-11">&lt;&lt;</span><span·class="s">&quot;Second·bytes&quot;</span><span·class="p"·data-group-id="8194287065-11">[·...·truncated·by·diffoscope;·len:·56,·SHA:·94a1aadf74ad223c0dc3746918535ecb7a147efd718c1956a9af202f103c31e0·...·]-10">)</span><span·class="p">.</span><span·class="w">
206 »       </span><span·class="p"·data-group-id="1065829486-12">&lt;&lt;</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">115</span><span·class="p">,</span><span·class="mi">234</spa[·...·truncated·by·diffoscope;·len:·397,·SHA:·c29f42ae8d0df80b44dcf91e6107a2a3e42fce3673971b783aa10902690b2fd4·...·]-12">&gt;&gt;</span><span·class="w">206 »       </span><span·class="p"·data-group-id="8194287065-12">&lt;&lt;</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">115</span><span·class="p">,</span><span·class="mi">234</spa[·...·truncated·by·diffoscope;·len:·397,·SHA:·e1711ed16e105ddc4bf49d30f10b6df8a4542ead71370dec55c3a43b6996ee00·...·]-12">&gt;&gt;</span><span·class="w">
207 »       </span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">207 »       </span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">
208 »       </span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">StateDec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_init</span><span·class="p"·data-group-id="1065829486-13">(</span><span·class="ss">aes_128_ctr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·67,·SHA:·7293746e27b7f6437f46b93c9392ade91eb9221a1154985cfa39336e2fee8992·...·]-13">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·decrypt·-&gt;·false</span><span·class="w">208 »       </span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">StateDec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_init</span><span·class="p"·data-group-id="8194287065-13">(</span><span·class="ss">aes_128_ctr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·67,·SHA:·ed1498f46483c2662b3528d160f3aa7079c763a5ceb1918be76dc19304089767·...·]-13">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·decrypt·-&gt;·false</span><span·class="w">
209 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.3768901617</span><span·class="p">.</span><span·class="mf">1128660994.124255</span><span·class="o">&gt;</span><span·class="w">209 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.3768901617</span><span·class="p">.</span><span·class="mf">1128660994.124255</span><span·class="o">&gt;</span><span·class="w">
210 »       </span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="1065829486-14">(</span><span·class="n">StateDec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-15">&lt;&lt;</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">44</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·339,·SHA:·cfca72ee7f396bd482e2ce1259636ca0cbd0a475b9005562b41b32fca359877a·...·]-14">)</span><span·class="p">.</span><span·class="w">210 »       </span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="8194287065-14">(</span><span·class="n">StateDec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-15">&lt;&lt;</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">44</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·339,·SHA:·e5a86c99ef49e7d989a757595eee538206a9be7339f0cb439103f34629b66578·...·]-14">)</span><span·class="p">.</span><span·class="w">
211 »       </span><span·class="p"·data-group-id="1065829486-16">&lt;&lt;</span><span·class="s">&quot;First·b&quot;</span><span·class="p"·data-group-id="1065829486-16">&gt;&gt;</span><span·class="w">211 »       </span><span·class="p"·data-group-id="8194287065-16">&lt;&lt;</span><span·class="s">&quot;First·b&quot;</span><span·class="p"·data-group-id="8194287065-16">&gt;&gt;</span><span·class="w">
212 »       </span><span·class="mi">9</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="1065829486-17">(</span><span·class="n">StateDec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-18">&lt;&lt;</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">162</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">115</span><span·class="p">,</span><span·class="mi">234</span><span·class="p">,</span><span·class="mi">197</span><span·class="p">,</span><span·class="w">212 »       </span><span·class="mi">9</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="8194287065-17">(</span><span·class="n">StateDec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-18">&lt;&lt;</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">162</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">115</span><span·class="p">,</span><span·class="mi">234</span><span·class="p">,</span><span·class="mi">197</span><span·class="p">,</span><span·class="w">
213 ········</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">253</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">144</span><span·class="p">,</span><span·class="mi">151</span><span·class="p"·data-group-id="1065829486-18">&gt;&gt;</span><span·class="p"·data-group-id="1065829486-17">)</span><span·class="p">.</span><span·class="w">213 ········</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">253</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">144</span><span·class="p">,</span><span·class="mi">151</span><span·class="p"·data-group-id="8194287065-18">&gt;&gt;</span><span·class="p"·data-group-id="8194287065-17">)</span><span·class="p">.</span><span·class="w">
214 »       </span><span·class="p"·data-group-id="1065829486-19">&lt;&lt;</span><span·class="s">&quot;ytesSecond·byte&quot;</span><span·class="p"·data-group-id="1065829486-19">&gt;&gt;</span><span·class="w">214 »       </span><span·class="p"·data-group-id="8194287065-19">&lt;&lt;</span><span·class="s">&quot;ytesSecond·byte&quot;</span><span·class="p"·data-group-id="8194287065-19">&gt;&gt;</span><span·class="w">
215 »       </span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="1065829486-20">(</span><span·class="n">StateDec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1065829486-21">&lt;&lt;</span><span·class="mi">41</span><span·class="p"·data-group-id="1065829486-21">&gt;&gt;</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·81938df548b26924664b6f3d39d49df8fcc2ee195dc349c1f558093c80a7edbd·...·]-20">)</span><span·class="p">.</span><span·class="w">215 »       </span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="8194287065-20">(</span><span·class="n">StateDec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8194287065-21">&lt;&lt;</span><span·class="mi">41</span><span·class="p"·data-group-id="8194287065-21">&gt;&gt;</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·5f1c884d43b3e77f8e1b0c39160bc3e0e2f1f46bcce33327e53dfc2a7ca39706·...·]-20">)</span><span·class="p">.</span><span·class="w">
216 »       </span><span·class="p"·data-group-id="1065829486-22">&lt;&lt;</span><span·class="s">&quot;s&quot;</span><span·class="p"·data-group-id="1065829486-22">&gt;&gt;</span><span·class="w">216 »       </span><span·class="p"·data-group-id="8194287065-22">&lt;&lt;</span><span·class="s">&quot;s&quot;</span><span·class="p"·data-group-id="8194287065-22">&gt;&gt;</span><span·class="w">
217 »       </span><span·class="mi">11</span><span·class="o">&gt;</span></code></pre><p>Note·that·the·internal·data·that·the·<code·class="inline">StateEnc</code>·and·<code·class="inline">StateDec</code>·references·are217 »       </span><span·class="mi">11</span><span·class="o">&gt;</span></code></pre><p>Note·that·the·internal·data·that·the·<code·class="inline">StateEnc</code>·and·<code·class="inline">StateDec</code>·references·are
218 destructivly·updated·by·the·calls·to218 destructivly·updated·by·the·calls·to
219 <a·href="crypto.html#crypto_update/2">crypto_update/2</a>.·This·is·to·gain·time·in·the·calls219 <a·href="crypto.html#crypto_update/2">crypto_update/2</a>.·This·is·to·gain·time·in·the·calls
220 of·the·nifs·interfacing·the·cryptolib.·In·a·loop·where·the·state·is·saved·in·the220 of·the·nifs·interfacing·the·cryptolib.·In·a·loop·where·the·state·is·saved·in·the
221 loop's·state,·it·also·saves·one·update·of·the·loop·state·per·crypto·operation.</p><p>For·example,·a·simple·server·receiving·text·parts·to·encrypt·and·send·the·result221 loop's·state,·it·also·saves·one·update·of·the·loop·state·per·crypto·operation.</p><p>For·example,·a·simple·server·receiving·text·parts·to·encrypt·and·send·the·result
222 back·to·the·one·who·sent·them·(the·<code·class="inline">Requester</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»      </span><span·class="nf">encode</span><span·class="p"·data-group-id="0133594721-1">(</span><span·class="n">Crypto</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p"·data-group-id="0133594721-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 back·to·the·one·who·sent·them·(the·<code·class="inline">Requester</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»      </span><span·class="nf">encode</span><span·class="p"·data-group-id="1194008136-1">(</span><span·class="n">Crypto</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p"·data-group-id="1194008136-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 »       </span><span·class="nf">crypto_loop</span><span·class="p"·data-group-id="0133594721-2">(</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_init</span><span·class="p"·data-group-id="0133594721-3">(</span><span·class="n">Crypto</span><span·class="p">,</span><span·class="w">·</span><span·class="n"[·...·truncated·by·diffoscope;·len:·254,·SHA:·6752ea254cfcd0d1de4691bf1cad7b8338567b01aa52664af273610d70f4eb4d·...·]-2">)</span><span·class="p">.</span><span·class="w">223 »       </span><span·class="nf">crypto_loop</span><span·class="p"·data-group-id="1194008136-2">(</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_init</span><span·class="p"·data-group-id="1194008136-3">(</span><span·class="n">Crypto</span><span·class="p">,</span><span·class="w">·</span><span·class="n"[·...·truncated·by·diffoscope;·len:·254,·SHA:·e89f236b56baaf625ce5278f4a63f2a8577b03f984a1120e904e03d21e53ef9f·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
224 »       </span><span·class="nf">crypto_loop</span><span·class="p"·data-group-id="0133594721-4">(</span><span·class="n">State</span><span·class="p"·data-group-id="0133594721-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 »       </span><span·class="nf">crypto_loop</span><span·class="p"·data-group-id="1194008136-4">(</span><span·class="n">State</span><span·class="p"·data-group-id="1194008136-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 »       </span><span·class="k">receive</span><span·class="w">225 »       </span><span·class="k">receive</span><span·class="w">
226 ········</span><span·class="p"·data-group-id="0133594721-5">{</span><span·class="n">Text</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Requester</span><span·class="p"·data-group-id="0133594721-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">226 ········</span><span·class="p"·data-group-id="1194008136-5">{</span><span·class="n">Text</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Requester</span><span·class="p"·data-group-id="1194008136-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
227 ········</span><span·class="n">Requester</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="0133594721-6">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Text</span><span·class="p"·data-group-id="0133594721-6">)</span><span·class="p">,</span><span·class="w">227 ········</span><span·class="n">Requester</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_update</span><span·class="p"·data-group-id="1194008136-6">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Text</span><span·class="p"·data-group-id="1194008136-6">)</span><span·class="p">,</span><span·class="w">
228 »       </span><span·class="nf">loop</span><span·class="p"·data-group-id="0133594721-7">(</span><span·class="n">State</span><span·class="p"·data-group-id="0133594721-7">)</span><span·class="w">228 »       </span><span·class="nf">loop</span><span·class="p"·data-group-id="1194008136-7">(</span><span·class="n">State</span><span·class="p"·data-group-id="1194008136-7">)</span><span·class="w">
229 »       </span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="example-of-crypto_one_time-5"·class="section-heading">229 »       </span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="example-of-crypto_one_time-5"·class="section-heading">
230 ··<a·href="#example-of-crypto_one_time-5"·class="hover-link">230 ··<a·href="#example-of-crypto_one_time-5"·class="hover-link">
231 ····<i·class="ri-link-m"·aria-hidden="true"></i>231 ····<i·class="ri-link-m"·aria-hidden="true"></i>
232 ··</a>232 ··</a>
233 ··<span·class="text">Example·of·crypto_one_time/5</span>233 ··<span·class="text">Example·of·crypto_one_time/5</span>
234 </h3>234 </h3>
235 <p>The·same·example·as·in·the235 <p>The·same·example·as·in·the
236 <a·href="new_api.html#examples-of-crypto_init-4-and-crypto_update-2">previous·section</a>,236 <a·href="new_api.html#examples-of-crypto_init-4-and-crypto_update-2">previous·section</a>,
237 but·now·with·one·call·to·<a·href="crypto.html#crypto_one_time/5">crypto_one_time/5</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»       </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5765424219-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="5765424219-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">237 but·now·with·one·call·to·<a·href="crypto.html#crypto_one_time/5">crypto_one_time/5</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»       </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4256512264-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="4256512264-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">
238 »       </span><span·class="p"·data-group-id="5765424219-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·386e0977f305d46337420b471045982792ed87746df1d5ad20082b564d93f8aa·...·]-2">&gt;&gt;</span><span·class="w">238 »       </span><span·class="p"·data-group-id="4256512264-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·feb8542f34c8b21f1bb8855485a124e869a8d5ea7ed6a082a09b9800c0c28f6b·...·]-2">&gt;&gt;</span><span·class="w">
239 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">IV</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5765424219-3">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="5765424219-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">239 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">IV</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4256512264-3">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="4256512264-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">
240 »       </span><span·class="p"·data-group-id="5765424219-4">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·6f7475912f3a5387ddd1ea1f1cd5352157c1e88aed5f32a41a208fde24370c31·...·]-4">&gt;&gt;</span><span·class="w">240 »       </span><span·class="p"·data-group-id="4256512264-4">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·b16435c5b91aaf3d5474026fff4a8cf6eb485d8927f7e7632b9ba4935b50a5bf·...·]-4">&gt;&gt;</span><span·class="w">
241 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Txt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5765424219-5">[</span><span·class="p"·data-group-id="5765424219-6">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="5765424219-6">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="5765424219-7"[·...·truncated·by·diffoscope;·len:·164,·SHA:·d4a9ce8178f43409a284317524c7f05cc80a4fca23deb3e30c99abb12f22ba83·...·]-5">]</span><span·class="p">.</span><span·class="w">241 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Txt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4256512264-5">[</span><span·class="p"·data-group-id="4256512264-6">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="4256512264-6">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="4256512264-7"[·...·truncated·by·diffoscope;·len:·164,·SHA:·e6ae10aa505e99b1e13d829ce46894f26c13a782641bbc2b8b83cc0e97b517f9·...·]-5">]</span><span·class="p">.</span><span·class="w">
242 »       </span><span·class="p"·data-group-id="5765424219-8">[</span><span·class="p"·data-group-id="5765424219-9">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="5765424219-9">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="5765424219-10[·...·truncated·by·diffoscope;·len:·166,·SHA:·b7dc62aa05cbfa280ce0de5ddf642e44ffae954101fc3cac16a3e06885408c11·...·]-8">]</span><span·class="w">242 »       </span><span·class="p"·data-group-id="4256512264-8">[</span><span·class="p"·data-group-id="4256512264-9">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="4256512264-9">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="4256512264-10[·...·truncated·by·diffoscope;·len:·166,·SHA:·1cdf87db7e5fd6910b0d66f53896be1ae9c5168063b15d29fd4af0291afbcdf8·...·]-8">]</span><span·class="w">
243 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_one_time</span><span·class="p"·data-group-id="5765424219-11">(</span><span·class="ss">aes_128_ctr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·140,·SHA:·0d8789c9abfcd0f09d91024d1bc2cbbe56d5454187971663220f49b8d88f0a5a·...·]-11">)</span><span·class="p">.</span><span·class="w">243 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_one_time</span><span·class="p"·data-group-id="4256512264-11">(</span><span·class="ss">aes_128_ctr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·140,·SHA:·b7252443eddba18f07eda823f616ad9f2f9c9689896284e308ba93a9173f299e·...·]-11">)</span><span·class="p">.</span><span·class="w">
244 »       </span><span·class="p"·data-group-id="5765424219-12">&lt;&lt;</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">44</span><span·class="p">,</span><span·class="mi">216</span><span·class="p">,</span><span·class="mi">166</span><span·class="p">,</span><span·class="mi">25</span><span·class="p">,</span><span·class="mi">130</span><span·class="p">,</span><span·class="mi">203</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">162</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">115</span><span·class="p">,</span><span·class="mi">234</span><span·class="p">,</span><span·class="w">244 »       </span><span·class="p"·data-group-id="4256512264-12">&lt;&lt;</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">44</span><span·class="p">,</span><span·class="mi">216</span><span·class="p">,</span><span·class="mi">166</span><span·class="p">,</span><span·class="mi">25</span><span·class="p">,</span><span·class="mi">130</span><span·class="p">,</span><span·class="mi">203</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">162</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">115</span><span·class="p">,</span><span·class="mi">234</span><span·class="p">,</span><span·class="w">
245 »       </span><span·class="mi">197</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">253</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">144</span><span·class="p">,</span><span·class="mi">151</span><span·class="p">,</span><span·class="mi">41</span><span·class="p"·data-group-id="5765424219-12">&gt;&gt;</span><span·class="w">245 »       </span><span·class="mi">197</span><span·class="p">,</span><span·class="mi">94</span><span·class="p">,</span><span·class="mi">253</span><span·class="p">,</span><span·class="mi">16</span><span·class="p">,</span><span·class="mi">144</span><span·class="p">,</span><span·class="mi">151</span><span·class="p">,</span><span·class="mi">41</span><span·class="p"·data-group-id="4256512264-12">&gt;&gt;</span><span·class="w">
246 »       </span><span·class="mi">5</span><span·class="o">&gt;</span></code></pre><p>The·<code·class="inline">[&lt;&lt;&quot;First·bytes&quot;&gt;&gt;,&lt;&lt;&quot;Second·bytes&quot;&gt;&gt;]</code>·could·of·course·have·been·one246 »       </span><span·class="mi">5</span><span·class="o">&gt;</span></code></pre><p>The·<code·class="inline">[&lt;&lt;&quot;First·bytes&quot;&gt;&gt;,&lt;&lt;&quot;Second·bytes&quot;&gt;&gt;]</code>·could·of·course·have·been·one
247 single·binary:·<code·class="inline">&lt;&lt;&quot;First·bytesSecond·bytes&quot;&gt;&gt;</code>.</p><h3·id="example-of-crypto_one_time_aead-6"·class="section-heading">247 single·binary:·<code·class="inline">&lt;&lt;&quot;First·bytesSecond·bytes&quot;&gt;&gt;</code>.</p><h3·id="example-of-crypto_one_time_aead-6"·class="section-heading">
248 ··<a·href="#example-of-crypto_one_time_aead-6"·class="hover-link">248 ··<a·href="#example-of-crypto_one_time_aead-6"·class="hover-link">
249 ····<i·class="ri-link-m"·aria-hidden="true"></i>249 ····<i·class="ri-link-m"·aria-hidden="true"></i>
250 ··</a>250 ··</a>
251 ··<span·class="text">Example·of·crypto_one_time_aead/6</span>251 ··<span·class="text">Example·of·crypto_one_time_aead/6</span>
252 </h3>252 </h3>
253 <p>The·same·example·as·in·the253 <p>The·same·example·as·in·the
254 <a·href="new_api.html#example-of-crypto_one_time-5">previous·section</a>,·but·now·with·one254 <a·href="new_api.html#example-of-crypto_one_time-5">previous·section</a>,·but·now·with·one
255 call·to·<a·href="crypto.html#crypto_one_time_aead/6">crypto_one_time_aead/6</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»  </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9722484580-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="9722484580-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">255 call·to·<a·href="crypto.html#crypto_one_time_aead/6">crypto_one_time_aead/6</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»  </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1407323371-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="1407323371-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">
256 »       </span><span·class="p"·data-group-id="9722484580-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·f9a083e95da439ba2ba3f3617e98bf9807132689d308719d870b79e1e234d6a7·...·]-2">&gt;&gt;</span><span·class="w">256 »       </span><span·class="p"·data-group-id="1407323371-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·f58bf0bc371db46f67438a91b7d2cac708df652bf0ee3d66be724c5d86562954·...·]-2">&gt;&gt;</span><span·class="w">
257 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">IV</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9722484580-3">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="9722484580-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">257 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">IV</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1407323371-3">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="1407323371-3">&gt;&gt;</span><span·class="p">.</span><span·class="w">
258 »       </span><span·class="p"·data-group-id="9722484580-4">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·f737d0a516869c05d3583fe3241454dabe9a612280bcc9bab1a66d35502a35ca·...·]-4">&gt;&gt;</span><span·class="w">258 »       </span><span·class="p"·data-group-id="1407323371-4">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·d9f2af70738881c8f4a5bc2ef9b15772c4e18758da5d34200e36de4589b9b94d·...·]-4">&gt;&gt;</span><span·class="w">
259 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Txt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9722484580-5">[</span><span·class="p"·data-group-id="9722484580-6">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="9722484580-6">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="9722484580-7"[·...·truncated·by·diffoscope;·len:·164,·SHA:·f3d77ab051edb17d84f364fcf6aed8ba9760ae3bf7285a13a5fa052708787b70·...·]-5">]</span><span·class="p">.</span><span·class="w">259 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Txt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1407323371-5">[</span><span·class="p"·data-group-id="1407323371-6">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="1407323371-6">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="1407323371-7"[·...·truncated·by·diffoscope;·len:·164,·SHA:·38e7c5680726db951d980d108d73d51f636a454aae7428d6bf5027de405a72af·...·]-5">]</span><span·class="p">.</span><span·class="w">
260 »       </span><span·class="p"·data-group-id="9722484580-8">[</span><span·class="p"·data-group-id="9722484580-9">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="9722484580-9">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="9722484580-10[·...·truncated·by·diffoscope;·len:·166,·SHA:·8f16c3426a1aba85ccff057095a6a53b95303d4b9c6344c7b5e55685f3fe2df3·...·]-8">]</span><span·class="w">260 »       </span><span·class="p"·data-group-id="1407323371-8">[</span><span·class="p"·data-group-id="1407323371-9">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="1407323371-9">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="1407323371-10[·...·truncated·by·diffoscope;·len:·166,·SHA:·d1a8559fb92da7f790728b29c8528dd05ad3250ca664ed0bab5bc3e0fd7a14a9·...·]-8">]</span><span·class="w">
261 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">AAD</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9722484580-11">&lt;&lt;</span><span·class="s">&quot;Some·additional·auth·data&quot;</span><span·class="p"·data-group-id="9722484580-11">&gt;&gt;</span><span·class="p">.</span><span·class="w">261 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">AAD</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1407323371-11">&lt;&lt;</span><span·class="s">&quot;Some·additional·auth·data&quot;</span><span·class="p"·data-group-id="1407323371-11">&gt;&gt;</span><span·class="p">.</span><span·class="w">
262 »       </span><span·class="p"·data-group-id="9722484580-12">&lt;&lt;</span><span·class="s">&quot;Some·additional·auth·data&quot;</span><span·class="p"·data-group-id="9722484580-12">&gt;&gt;</span><span·class="w">262 »       </span><span·class="p"·data-group-id="1407323371-12">&lt;&lt;</span><span·class="s">&quot;Some·additional·auth·data&quot;</span><span·class="p"·data-group-id="1407323371-12">&gt;&gt;</span><span·class="w">
263 »       </span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_one_time_aead</span><span·class="p"·data-group-id="9722484580-13">(</span><span·class="ss">aes_128_gcm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·214,·SHA:·6f026e62fd935e7ecb8d132f4d026c6e88e20db63162314ce9a102d1d2b9db6a·...·]-13">)</span><span·class="p">.</span><span·class="w">263 »       </span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">crypto_one_time_aead</span><span·class="p"·data-group-id="1407323371-13">(</span><span·class="ss">aes_128_gcm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IV</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·214,·SHA:·9a58d30ce0d14ef2497b6a79b640197dd04882fa07c906345b13862782f1c6df·...·]-13">)</span><span·class="p">.</span><span·class="w">
264 »       </span><span·class="p"·data-group-id="9722484580-14">{</span><span·class="p"·data-group-id="9722484580-15">&lt;&lt;</span><span·class="mi">240</span><span·class="p">,</span><span·class="mi">130</span><span·class="p">,</span><span·class="mi">38</span><span·class="p">,</span><span·class="mi">96</span><span·class="p">,</span><span·class="mi">130</span><span·class="p">,</span><span·class="mi">241</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">52</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">190</span><span·class="p">,</span><span·class="mi">179</span><span·class="p">,</span><span·class="mi">213</span><span·class="p">,</span><span·class="mi">132</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">72</span><span·class="p">,</span><span·class="w">264 »       </span><span·class="p"·data-group-id="1407323371-14">{</span><span·class="p"·data-group-id="1407323371-15">&lt;&lt;</span><span·class="mi">240</span><span·class="p">,</span><span·class="mi">130</span><span·class="p">,</span><span·class="mi">38</span><span·class="p">,</span><span·class="mi">96</span><span·class="p">,</span><span·class="mi">130</span><span·class="p">,</span><span·class="mi">241</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">52</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">190</span><span·class="p">,</span><span·class="mi">179</span><span·class="p">,</span><span·class="mi">213</span><span·class="p">,</span><span·class="mi">132</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">72</span><span·class="p">,</span><span·class="w">
265 »       </span><span·class="mi">192</span><span·class="p">,</span><span·class="mi">103</span><span·class="p">,</span><span·class="mi">176</span><span·class="p">,</span><span·class="mi">90</span><span·class="p">,</span><span·class="mi">104</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">71</span><span·class="p">,</span><span·class="mi">158</span><span·class="p"·data-group-id="9722484580-15">&gt;&gt;</span><span·class="p">,</span><span·class="w">265 »       </span><span·class="mi">192</span><span·class="p">,</span><span·class="mi">103</span><span·class="p">,</span><span·class="mi">176</span><span·class="p">,</span><span·class="mi">90</span><span·class="p">,</span><span·class="mi">104</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">71</span><span·class="p">,</span><span·class="mi">158</span><span·class="p"·data-group-id="1407323371-15">&gt;&gt;</span><span·class="p">,</span><span·class="w">
266 »       </span><span·class="p"·data-group-id="9722484580-16">&lt;&lt;</span><span·class="mi">131</span><span·class="p">,</span><span·class="mi">47</span><span·class="p">,</span><span·class="mi">45</span><span·class="p">,</span><span·class="mi">91</span><span·class="p">,</span><span·class="mi">142</spa[·...·truncated·by·diffoscope;·len:·657,·SHA:·2f404e163fdf8877e3bacb9cfffdb58571fbc9cf6a0a914baeb7de54824db10f·...·]-14">}</span><span·class="w">266 »       </span><span·class="p"·data-group-id="1407323371-16">&lt;&lt;</span><span·class="mi">131</span><span·class="p">,</span><span·class="mi">47</span><span·class="p">,</span><span·class="mi">45</span><span·class="p">,</span><span·class="mi">91</span><span·class="p">,</span><span·class="mi">142</spa[·...·truncated·by·diffoscope;·len:·657,·SHA:·4b0a42820b65c6172b791d082f9ec9760f47cf76283c84a5ca15526b6b3a4621·...·]-14">}</span><span·class="w">
267 »       </span><span·class="mi">6</span><span·class="o">&gt;</span></code></pre><p>The·<code·class="inline">[&lt;&lt;&quot;First·bytes&quot;&gt;&gt;,&lt;&lt;&quot;Second·bytes&quot;&gt;&gt;]</code>·could·of·course·have·been·one267 »       </span><span·class="mi">6</span><span·class="o">&gt;</span></code></pre><p>The·<code·class="inline">[&lt;&lt;&quot;First·bytes&quot;&gt;&gt;,&lt;&lt;&quot;Second·bytes&quot;&gt;&gt;]</code>·could·of·course·have·been·one
268 single·binary:·<code·class="inline">&lt;&lt;&quot;First·bytesSecond·bytes&quot;&gt;&gt;</code>.</p><h3·id="example-of-mac_init-mac_update-and-mac_final"·class="section-heading">268 single·binary:·<code·class="inline">&lt;&lt;&quot;First·bytesSecond·bytes&quot;&gt;&gt;</code>.</p><h3·id="example-of-mac_init-mac_update-and-mac_final"·class="section-heading">
269 ··<a·href="#example-of-mac_init-mac_update-and-mac_final"·class="hover-link">269 ··<a·href="#example-of-mac_init-mac_update-and-mac_final"·class="hover-link">
270 ····<i·class="ri-link-m"·aria-hidden="true"></i>270 ····<i·class="ri-link-m"·aria-hidden="true"></i>
271 ··</a>271 ··</a>
272 ··<span·class="text">Example·of·mac_init·mac_update·and·mac_final</span>272 ··<span·class="text">Example·of·mac_init·mac_update·and·mac_final</span>
273 </h3>273 </h3>
274 <pre><code·class="makeup·erlang"·translate="no"><span·class="w">»   </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2070182279-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="2070182279-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">274 <pre><code·class="makeup·erlang"·translate="no"><span·class="w">»   </span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4185921155-1">&lt;&lt;</span><span·class="mi">1</span><span·class="p">:</span><span·class="mi">128</span><span·class="p"·data-group-id="4185921155-1">&gt;&gt;</span><span·class="p">.</span><span·class="w">
275 »       </span><span·class="p"·data-group-id="2070182279-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·8d14dbe665b41c5feaf5e55c2b65c351213a5bd46da4c2d73d6ae1d3578484c3·...·]-2">&gt;&gt;</span><span·class="w">275 »       </span><span·class="p"·data-group-id="4185921155-2">&lt;&lt;</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·[·...·truncated·by·diffoscope;·len:·574,·SHA:·fb9ff5191aeb94729e1f2b84fb0c125db84f48271654aed9b4efbef2cef69c81·...·]-2">&gt;&gt;</span><span·class="w">
276 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">StateMac</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_init</span><span·class="p"·data-group-id="2070182279-3">(</span><span·class="ss">cmac</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">aes_128_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="2070182279-3">)</span><span·class="p">.</span><span·class="w">276 »       </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">StateMac</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_init</span><span·class="p"·data-group-id="4185921155-3">(</span><span·class="ss">cmac</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">aes_128_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4185921155-3">)</span><span·class="p">.</span><span·class="w">
277 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">277 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">
278 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_update</span><span·class="p"·data-group-id="2070182279-4">(</span><span·class="n">StateMac</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2070182279-5">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="2070182279-5">&gt;[·...·truncated·by·diffoscope;·len:·52,·SHA:·c6f2e322f16c5f924aec38b7803882fc7e19b7f727673094e3073c2b31e6ceb8·...·]-4">)</span><span·class="p">.</span><span·class="w">278 »       </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_update</span><span·class="p"·data-group-id="4185921155-4">(</span><span·class="n">StateMac</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4185921155-5">&lt;&lt;</span><span·class="s">&quot;First·bytes&quot;</span><span·class="p"·data-group-id="4185921155-5">&gt;[·...·truncated·by·diffoscope;·len:·52,·SHA:·1e78c6c7e21cfdad6c15684fe613e8236bb9d8f042b4dc6b1d74f956c334bf99·...·]-4">)</span><span·class="p">.</span><span·class="w">
279 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">279 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">
280 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_update</span><span·class="p"·data-group-id="2070182279-6">(</span><span·class="n">StateMac</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;·&quot;</span><span·class="p"·data-group-id="2070182279-6">)</span><span·class="p">.</span><span·class="w">280 »       </span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_update</span><span·class="p"·data-group-id="4185921155-6">(</span><span·class="n">StateMac</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;·&quot;</span><span·class="p"·data-group-id="4185921155-6">)</span><span·class="p">.</span><span·class="w">
281 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">281 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">
282 »       </span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_update</span><span·class="p"·data-group-id="2070182279-7">(</span><span·class="n">StateMac</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2070182279-8">&lt;&lt;</span><span·class="s">&quot;last·bytes&quot;</span><span·class="p"·data-group-id="2070182279-8">&gt;&[·...·truncated·by·diffoscope;·len:·51,·SHA:·a27093db3f1e424de906ec7dc0cec634661cb21691943c505160b2a7acb5e998·...·]-7">)</span><span·class="p">.</span><span·class="w">282 »       </span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_update</span><span·class="p"·data-group-id="4185921155-7">(</span><span·class="n">StateMac</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4185921155-8">&lt;&lt;</span><span·class="s">&quot;last·bytes&quot;</span><span·class="p"·data-group-id="4185921155-8">&gt;&[·...·truncated·by·diffoscope;·len:·51,·SHA:·1064733a4144bd10cb948c0903eadba334f999d40ba25ea6a611dc97efecbeb2·...·]-7">)</span><span·class="p">.</span><span·class="w">
283 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">283 »       </span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.2424664121</span><span·class="p">.</span><span·class="mf">2781478916.232610</span><span·class="o">&gt;</span><span·class="w">
284 »       </span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_final</span><span·class="p"·data-group-id="2070182279-9">(</span><span·class="n">StateMac</span><span·class="p"·data-group-id="2070182279-9">)</span><span·class="p">.</span><span·class="w">284 »       </span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac_final</span><span·class="p"·data-group-id="4185921155-9">(</span><span·class="n">StateMac</span><span·class="p"·data-group-id="4185921155-9">)</span><span·class="p">.</span><span·class="w">
285 »       </span><span·class="p"·data-group-id="2070182279-10">&lt;&lt;</span><span·class="mi">68</span><span·class="p">,</span><span·class="mi">191</span><span·class="p">,</span><span·class="mi">219</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">84</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">193</span><span·class="p">,</span><span·class="mi">197</span><span·class="p">,</span><span·class="mi">238</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">214</span><span·class="p">,</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="w">285 »       </span><span·class="p"·data-group-id="4185921155-10">&lt;&lt;</span><span·class="mi">68</span><span·class="p">,</span><span·class="mi">191</span><span·class="p">,</span><span·class="mi">219</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">84</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">193</span><span·class="p">,</span><span·class="mi">197</span><span·class="p">,</span><span·class="mi">238</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">214</span><span·class="p">,</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="w">
286 »       </span><span·class="mi">249</span><span·class="p"·data-group-id="2070182279-10">&gt;&gt;</span><span·class="w">286 »       </span><span·class="mi">249</span><span·class="p"·data-group-id="4185921155-10">&gt;&gt;</span><span·class="w">
287 »       </span><span·class="mi">7</span><span·class="o">&gt;</span></code></pre><p>and·compare·the·result·with·a·single·calculation·just·for·this·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»  </span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac</span><span·class="p"·data-group-id="0541179670-1">(</span><span·class="ss">cmac</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">aes_128_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·96,·SHA:·c191deba73915ba541558eb9553399aacabdaa2da1202e5498bd3f8520eb07d9·...·]0-1">)</span><span·class="p">.</span><span·class="w">287 »       </span><span·class="mi">7</span><span·class="o">&gt;</span></code></pre><p>and·compare·the·result·with·a·single·calculation·just·for·this·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»  </span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">crypto</span><span·class="p">:</span><span·class="nf">mac</span><span·class="p"·data-group-id="2013089090-1">(</span><span·class="ss">cmac</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">aes_128_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·96,·SHA:·2cb53e720847c8e1de4b2eeca55d5bb96298388c44d02005bf7f5a7eff217b4a·...·]0-1">)</span><span·class="p">.</span><span·class="w">
288 »       </span><span·class="p"·data-group-id="0541179670-2">&lt;&lt;</span><span·class="mi">68</span><span·class="p">,</span><span·class="mi">191</span><span·class="p">,</span><span·class="mi">219</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">84</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">193</span><span·class="p">,</span><span·class="mi">197</span><span·class="p">,</span><span·class="mi">238</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">214</span><span·class="p">,</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="w">288 »       </span><span·class="p"·data-group-id="2013089090-2">&lt;&lt;</span><span·class="mi">68</span><span·class="p">,</span><span·class="mi">191</span><span·class="p">,</span><span·class="mi">219</span><span·class="p">,</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">84</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">193</span><span·class="p">,</span><span·class="mi">197</span><span·class="p">,</span><span·class="mi">238</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">214</span><span·class="p">,</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">160</span><span·class="p">,</span><span·class="w">
289 »       </span><span·class="mi">249</span><span·class="p"·data-group-id="0541179670-2">&gt;&gt;</span><span·class="w">289 »       </span><span·class="mi">249</span><span·class="p"·data-group-id="2013089090-2">&gt;&gt;</span><span·class="w">
290 »       </span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">v</span><span·class="p"·data-group-id="0541179670-3">(</span><span·class="mi">7</span><span·class="p"·data-group-id="0541179670-3">)</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="nf">v</span><span·class="p"·data-group-id="0541179670-4">(</span><span[·...·truncated·by·diffoscope;·len:·60,·SHA:·26c933443f0c09037d721f02c3590f6288f404c539783e5df93216eb3c39eb29·...·]0-4">)</span><span·class="p">.</span><span·class="w">290 »       </span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">v</span><span·class="p"·data-group-id="2013089090-3">(</span><span·class="mi">7</span><span·class="p"·data-group-id="2013089090-3">)</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="nf">v</span><span·class="p"·data-group-id="2013089090-4">(</span><span[·...·truncated·by·diffoscope;·len:·60,·SHA:·b8f3da032eae869a2f9af91aca638ba7edc0d43b1f1306336dc6d41d3f212da7·...·]0-4">)</span><span·class="p">.</span><span·class="w">
291 »       </span><span·class="ss">true</span><span·class="w">291 »       </span><span·class="ss">true</span><span·class="w">
292 »       </span><span·class="mi">9</span><span·class="o">&gt;</span></code></pre><h2·id="retired-cipher-names"·class="section-heading">292 »       </span><span·class="mi">9</span><span·class="o">&gt;</span></code></pre><h2·id="retired-cipher-names"·class="section-heading">
293 ··<a·href="#retired-cipher-names"·class="hover-link">293 ··<a·href="#retired-cipher-names"·class="hover-link">
294 ····<i·class="ri-link-m"·aria-hidden="true"></i>294 ····<i·class="ri-link-m"·aria-hidden="true"></i>
295 ··</a>295 ··</a>
296 ··<span·class="text">Retired·cipher·names</span>296 ··<span·class="text">Retired·cipher·names</span>
297 </h2>297 </h2>
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147 ····</footer>147 ····</footer>
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335 ······<p·class="built-using">335 ······<p·class="built-using">
336 ········Built·using336 ········Built·using
337 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the337 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
338 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>338 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
339 ······</p>339 ······</p>
340 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>340 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
341 ····</footer>341 ····</footer>
342 ··</div>342 ··</div>
343 </main>343 </main>
344 </div>344 </div>
345 <script>345 <script>
346 ··function·mermaidLoaded()·{346 ··function·mermaidLoaded()·{
347 ····mermaid.initialize({347 ····mermaid.initialize({
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160 ····<i·class="ri-link-m"·aria-hidden="true"></i>160 ····<i·class="ri-link-m"·aria-hidden="true"></i>
161 ··</a>161 ··</a>
162 ··<span·class="text">Executable·Lines</span>162 ··<span·class="text">Executable·Lines</span>
163 </h3>163 </h3>
164 <p>To·have·an·effect,·a·breakpoint·must·be·set·at·an·<em>executable·line</em>,·which·is·a164 <p>To·have·an·effect,·a·breakpoint·must·be·set·at·an·<em>executable·line</em>,·which·is·a
165 line·of·code·containing·an·executable·expression·such·as·a·matching·or·a165 line·of·code·containing·an·executable·expression·such·as·a·matching·or·a
166 function·call.·A·blank·line·or·a·line·containing·a·comment,·function·head,·or166 function·call.·A·blank·line·or·a·line·containing·a·comment,·function·head,·or
167 pattern·in·a·<code·class="inline">case</code>·statement·or·<code·class="inline">receive</code>·statement·is·not·executable.</p><p>In·the·following·example,·lines·2,·4,·6,·8,·and·11·are·executable·lines:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">1</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">is_loaded</span><span·class="p"·data-group-id="7174855561-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="n">Compiled</span><span·class="p"·data-group-id="7174855561-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 pattern·in·a·<code·class="inline">case</code>·statement·or·<code·class="inline">receive</code>·statement·is·not·executable.</p><p>In·the·following·example,·lines·2,·4,·6,·8,·and·11·are·executable·lines:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">1</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">is_loaded</span><span·class="p"·data-group-id="1547210706-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="n">Compiled</span><span·class="p"·data-group-id="1547210706-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 </span><span·class="mi">2</span><span·class="p">:</span><span·class="w">···</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_file</span><span·class="p"·data-group-id="7174855561-2">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="n">Compiled</span><span·class="p"·data-group-id="7174855561-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">168 </span><span·class="mi">2</span><span·class="p">:</span><span·class="w">···</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_file</span><span·class="p"·data-group-id="1547210706-2">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="n">Compiled</span><span·class="p"·data-group-id="1547210706-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
169 </span><span·class="mi">3</span><span·class="p">:</span><span·class="w">·····</span><span·class="p"·data-group-id="7174855561-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">File</span><span·class="p"·data-group-id="7174855561-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 </span><span·class="mi">3</span><span·class="p">:</span><span·class="w">·····</span><span·class="p"·data-group-id="1547210706-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">File</span><span·class="p"·data-group-id="1547210706-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 </span><span·class="mi">4</span><span·class="p">:</span><span·class="w">·······</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">which</span><span·class="p"·data-group-id="7174855561-4">(</span><span·class="n">Module</span><span·class="p"·data-group-id="7174855561-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">170 </span><span·class="mi">4</span><span·class="p">:</span><span·class="w">·······</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">which</span><span·class="p"·data-group-id="1547210706-4">(</span><span·class="n">Module</span><span·class="p"·data-group-id="1547210706-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
171 </span><span·class="mi">5</span><span·class="p">:</span><span·class="w">·········</span><span·class="o">?</span><span·class="n">TAG</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 </span><span·class="mi">5</span><span·class="p">:</span><span·class="w">·········</span><span·class="o">?</span><span·class="n">TAG</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 </span><span·class="mi">6</span><span·class="p">:</span><span·class="w">···········</span><span·class="p"·data-group-id="7174855561-5">{</span><span·class="ss">loaded</span><span·class="p">,</span><span·class="n">File</span><span·class="p"·data-group-id="7174855561-5">}</span><span·class="p">;</span><span·class="w">172 </span><span·class="mi">6</span><span·class="p">:</span><span·class="w">···········</span><span·class="p"·data-group-id="1547210706-5">{</span><span·class="ss">loaded</span><span·class="p">,</span><span·class="n">File</span><span·class="p"·data-group-id="1547210706-5">}</span><span·class="p">;</span><span·class="w">
173 </span><span·class="mi">7</span><span·class="p">:</span><span·class="w">·········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="mi">7</span><span·class="p">:</span><span·class="w">·········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 </span><span·class="mi">8</span><span·class="p">:</span><span·class="w">···········</span><span·class="ss">unloaded</span><span·class="w">174 </span><span·class="mi">8</span><span·class="p">:</span><span·class="w">···········</span><span·class="ss">unloaded</span><span·class="w">
175 </span><span·class="mi">9</span><span·class="p">:</span><span·class="w">·······</span><span·class="k">end</span><span·class="p">;</span><span·class="w">175 </span><span·class="mi">9</span><span·class="p">:</span><span·class="w">·······</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
176 </span><span·class="mi">10</span><span·class="p">:</span><span·class="w">····</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 </span><span·class="mi">10</span><span·class="p">:</span><span·class="w">····</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 </span><span·class="mi">11</span><span·class="p">:</span><span·class="w">······</span><span·class="ss">false</span><span·class="w">177 </span><span·class="mi">11</span><span·class="p">:</span><span·class="w">······</span><span·class="ss">false</span><span·class="w">
178 </span><span·class="mi">12</span><span·class="p">:</span><span·class="w">··</span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="status-and-trigger-action"·class="section-heading">178 </span><span·class="mi">12</span><span·class="p">:</span><span·class="w">··</span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="status-and-trigger-action"·class="section-heading">
179 ··<a·href="#status-and-trigger-action"·class="hover-link">179 ··<a·href="#status-and-trigger-action"·class="hover-link">
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204 returns·<code·class="inline">true</code>,·the·process·stops.·If·the·function·call·returns·<code·class="inline">false</code>,·the204 returns·<code·class="inline">true</code>,·the·process·stops.·If·the·function·call·returns·<code·class="inline">false</code>,·the
205 breakpoint·is·silently·ignored.</p><p><code·class="inline">Bindings</code>·is·a·list·of·variable·bindings.·To·retrieve·the·value·of·<code·class="inline">Variable</code>205 breakpoint·is·silently·ignored.</p><p><code·class="inline">Bindings</code>·is·a·list·of·variable·bindings.·To·retrieve·the·value·of·<code·class="inline">Variable</code>
206 (given·as·an·atom),·use·function206 (given·as·an·atom),·use·function
207 <a·href="int.html#get_binding/2"><code·class="inline">int:get_binding(Variable,·Bindings)</code></a>.·The·function207 <a·href="int.html#get_binding/2"><code·class="inline">int:get_binding(Variable,·Bindings)</code></a>.·The·function
208 returns·<code·class="inline">unbound</code>·or·<code·class="inline">{value,Value}</code>.</p><p><img·src="assets/cond_break_dialog.jpg"·alt="Conditional·Break·Dialog·Window"·title="Conditional·Break·Dialog·Window"/></p><p>Right-click·the·<em>Module</em>·entry·to·open·a·popup·menu·from·which·the·appropriate208 returns·<code·class="inline">unbound</code>·or·<code·class="inline">{value,Value}</code>.</p><p><img·src="assets/cond_break_dialog.jpg"·alt="Conditional·Break·Dialog·Window"·title="Conditional·Break·Dialog·Window"/></p><p>Right-click·the·<em>Module</em>·entry·to·open·a·popup·menu·from·which·the·appropriate
209 module·can·be·selected.</p><p><em>Example:</em></p><p>A·conditional·breakpoint·calling·<code·class="inline">c_test:c_break/1</code>·is·added·at·line·6·in·module209 module·can·be·selected.</p><p><em>Example:</em></p><p>A·conditional·breakpoint·calling·<code·class="inline">c_test:c_break/1</code>·is·added·at·line·6·in·module
210 <code·class="inline">fact</code>.·Each·time·the·breakpoint·is·reached,·the·function·is·called.·When·<code·class="inline">N</code>·is210 <code·class="inline">fact</code>.·Each·time·the·breakpoint·is·reached,·the·function·is·called.·When·<code·class="inline">N</code>·is
211 equal·to·3,·the·function·returns·<code·class="inline">true</code>·and·the·process·stops.</p><p>Extract·from·<code·class="inline">fact.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">5</span><span·class="p">.</span><span·class="w">·</span><span·class="nf">fac</span><span·class="p"·data-group-id="7190740380-1">(</span><span·class="mi">0</span><span·class="p"·data-group-id="7190740380-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">211 equal·to·3,·the·function·returns·<code·class="inline">true</code>·and·the·process·stops.</p><p>Extract·from·<code·class="inline">fact.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">5</span><span·class="p">.</span><span·class="w">·</span><span·class="nf">fac</span><span·class="p"·data-group-id="4534008957-1">(</span><span·class="mi">0</span><span·class="p"·data-group-id="4534008957-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">
212 </span><span·class="mi">6</span><span·class="p">.</span><span·class="w">·</span><span·class="nf">fac</span><span·class="p"·data-group-id="7190740380-2">(</span><span·class="n">N</span><span·class="p"·data-group-id="7190740380-2">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·c[·...·truncated·by·diffoscope;·len:·961,·SHA:·c48c337bc6fb4a2670cd5228441e299c6a3708c20a25584745f7ede4d0a1aeee·...·]-1">)</span><span·class="p">.</span><span·class="w">212 </span><span·class="mi">6</span><span·class="p">.</span><span·class="w">·</span><span·class="nf">fac</span><span·class="p"·data-group-id="4534008957-2">(</span><span·class="n">N</span><span·class="p"·data-group-id="4534008957-2">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·c[·...·truncated·by·diffoscope;·len:·961,·SHA:·2d38abd782d642ce8624a812bcffb4edb6da11100cd6d8c2307d8647c51de473·...·]-1">)</span><span·class="p">.</span><span·class="w">
213 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8723204888-2">(</span><span·class="p"·data-group-id="8723204888-3">[</span><span·class="ss">c_break</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="8723204888-3">]</span><span·class="p"·data-group-id="8723204888-2">)</span><span·class="p">.</span><span·class="w">213 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0608692317-2">(</span><span·class="p"·data-group-id="0608692317-3">[</span><span·class="ss">c_break</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="0608692317-3">]</span><span·class="p"·data-group-id="0608692317-2">)</span><span·class="p">.</span><span·class="w">
  
214 </span><span·class="nf">c_break</span><span·class="p"·data-group-id="8723204888-4">(</span><span·class="n">Bindings</span><span·class="p"·data-group-id="8723204888-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 </span><span·class="nf">c_break</span><span·class="p"·data-group-id="0608692317-4">(</span><span·class="n">Bindings</span><span·class="p"·data-group-id="0608692317-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">int</span><span·class="p">:</span><span·class="nf">get_binding</span><span·class="p"·data-group-id="8723204888-5">(</span><span·class="ss">&#39;N&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bindings</span><span·class="p"·data-group-id="8723204888-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">215 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">int</span><span·class="p">:</span><span·class="nf">get_binding</span><span·class="p"·data-group-id="0608692317-5">(</span><span·class="ss">&#39;N&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bindings</span><span·class="p"·data-group-id="0608692317-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
216 ········</span><span·class="p"·data-group-id="8723204888-6">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="8723204888-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">216 ········</span><span·class="p"·data-group-id="0608692317-6">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="0608692317-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
217 ············</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">217 ············</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
218 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">218 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
219 ············</span><span·class="ss">false</span><span·class="w">219 ············</span><span·class="ss">false</span><span·class="w">
220 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="function-breakpoints"·class="section-heading">220 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><h3·id="function-breakpoints"·class="section-heading">
221 ··<a·href="#function-breakpoints"·class="hover-link">221 ··<a·href="#function-breakpoints"·class="hover-link">
222 ····<i·class="ri-link-m"·aria-hidden="true"></i>222 ····<i·class="ri-link-m"·aria-hidden="true"></i>
223 ··</a>223 ··</a>
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231 ··<a·href="#stack-trace"·class="hover-link">231 ··<a·href="#stack-trace"·class="hover-link">
232 ····<i·class="ri-link-m"·aria-hidden="true"></i>232 ····<i·class="ri-link-m"·aria-hidden="true"></i>
233 ··</a>233 ··</a>
234 ··<span·class="text">Stack·Trace</span>234 ··<span·class="text">Stack·Trace</span>
235 </h2>235 </h2>
236 <p>The·Erlang·emulator·keeps·track·of·a·<em>stack·trace</em>,·information·about·recent236 <p>The·Erlang·emulator·keeps·track·of·a·<em>stack·trace</em>,·information·about·recent
237 function·calls.·This·information·is·used·if·an·error·occurs,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="k">catch</span><span·class="w">·</span><span·class="ss">a</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">237 function·calls.·This·information·is·used·if·an·error·occurs,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="k">catch</span><span·class="w">·</span><span·class="ss">a</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
238 </span><span·class="p"·data-group-id="4466894227-1">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-2">{</span><span·class="ss">badarith</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-3">[</span><span·clas[·...·truncated·by·diffoscope;·len:·507,·SHA:·5f6187502ac14d1bb068c38b0eed5cd93f44bd6afba1bfe75d674fa3639a20b9·...·]-4">}</span><span·class="p">,</span><span·class="w">238 </span><span·class="p"·data-group-id="2339177390-1">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-2">{</span><span·class="ss">badarith</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-3">[</span><span·clas[·...·truncated·by·diffoscope;·len:·507,·SHA:·72d18c9c9d7f7a3e16a08cb437734669ff0be9d87ac366ea1a72062bc4ca33db·...·]-4">}</span><span·class="p">,</span><span·class="w">
239 ···················</span><span·class="p"·data-group-id="4466894227-7">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">do_apply</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-8">[</span><span·class="p"·data-group-id="4466894227-9">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;erl_eval.erl&quot;</span><span·class="p"·data-group-id="4466894227-9">}</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-10">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">573</span><span·class="p"·data-group-id="4466894227-10">}</span><span·class="p"·data-group-id="4466894227-8">]</span><span·class="p"·data-group-id="4466894227-7">}</span><span·class="p">,</span><span·class="w"> 
240 ···················</span><span·class="p"·data-group-id="4466894227-11">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">expr</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-12">[</span><span·class="p"·data-group-id="4466894227-13">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;erl_eval.erl&quot;</span><span·class="p"·data-group-id="4466894227-13">}</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-14">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">357</span><span·class="p"·data-group-id="4466894227-14">}</span><span·class="p"·data-group-id="4466894227-12">]</span><span·class="p"·data-group-id="4466894227-11">}</span><span·class="p">,</span><span·class="w"> 
241 ···················</span><span·class="p"·data-group-id="4466894227-15">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">exprs</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-16">[</span><span·class="p"·data-group-id="4466894227-17">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;shell.erl&quot;</span><span·class="p"·data-group-id="4466894227-17">}</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-18">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">674</span><span·class="p"·data-group-id="4466894227-18">}</span><span·class="p"·data-group-id="4466894227-16">]</span><span·class="p"·data-group-id="4466894227-15">}</span><span·class="p">,</span><span·class="w"> 
242 ···················</span><span·class="p"·data-group-id="4466894227-19">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">eval_exprs</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-20">[</span><span·class="p"·data-group-id="4466894227-21">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;shell.erl&quot;</span><span·class="p"·data-group-id="4466894227-21">}</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-22">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">629</span><span·class="p"·data-group-id="4466894227-22">}</span><span·class="p"·data-group-id="4466894227-20">]</span><span·class="p"·data-group-id="4466894227-19">}</span><span·class="p">,</span><span·class="w"> 
243 ···················</span><span·class="p"·data-group-id="4466894227-23">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">eval_loop</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-group-id="4466894227-24">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·724,·SHA:·9c5bfc19491e7859ccac3f101d78fb311b7a275d3e27da68e2ec5f5572f82821·...·]239 ···················</span><span·class="p"·data-group-id="2339177390-7">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">do_apply</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-8">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·542,·SHA:·ed8d66ddc5fc2a4e0b1ce08ba42863ad0d08411b3eff192a9185fd2eb48f68c9·...·]
 240 ···················</span><span·class="p"·data-group-id="2339177390-11">{</span><span·class="ss">erl_eval</span><span·class="p">,</span><span·class="ss">expr</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-12">[</span><span·class="p"·data-group-id="2339177390-13">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;erl_eval.erl&quot;</span><span·class="p"·data-group-id="2339177390-13">}</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-14">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">357</span><span·class="p"·data-group-id="2339177390-14">}</span><span·class="p"·data-group-id="2339177390-12">]</span><span·class="p"·data-group-id="2339177390-11">}</span><span·class="p">,</span><span·class="w">
 241 ···················</span><span·class="p"·data-group-id="2339177390-15">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">exprs</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-16">[</span><span·class="p"·data-group-id="2339177390-17">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;shell.erl&quot;</span><span·class="p"·data-group-id="2339177390-17">}</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-18">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">674</span><span·class="p"·data-group-id="2339177390-18">}</span><span·class="p"·data-group-id="2339177390-16">]</span><span·class="p"·data-group-id="2339177390-15">}</span><span·class="p">,</span><span·class="w">
 242 ···················</span><span·class="p"·data-group-id="2339177390-19">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">eval_exprs</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-20">[</span><span·class="p"·data-group-id="2339177390-21">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;shell.erl&quot;</span><span·class="p"·data-group-id="2339177390-21">}</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-22">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">629</span><span·class="p"·data-group-id="2339177390-22">}</span><span·class="p"·data-group-id="2339177390-20">]</span><span·class="p"·data-group-id="2339177390-19">}</span><span·class="p">,</span><span·class="w">
 243 ···················</span><span·class="p"·data-group-id="2339177390-23">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">eval_loop</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-24">[</span><span·class="p"·data-group-id="2339177390-25">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="s">&quot;shell.erl&quot;</span><span·class="p"·data-group-id="2339177390-25">}</span><span·class="p">,</span><span·class="p"·data-group-id="2339177390-26">{</span><span·class="ss">line</span><span·class="p">,</span><span·class="mi">614</span><span·class="p"·data-group-id="2339177390-26">}</span><span·class="p"·data-group-id="2339177390-24">]</span><span·class="p"·data-group-id="2339177390-23">}</span><span·class="p"·data-group-id="2339177390-3">]</span><span·class="p"·data-group-id="2339177390-2">}</span><span·class="p"·data-group-id="2339177390-1">}</span></code></pre><p>For·details·about·the·stack·trace,·see·section
244 <a·href="../../../../doc/system/errors.html">Errors·and·Error·Handling</a>·in·the·Erlang·Reference244 <a·href="../../../../doc/system/errors.html">Errors·and·Error·Handling</a>·in·the·Erlang·Reference
245 Manual.</p><p>Debugger·emulates·the·stack·trace·by·keeping·track·of·recently·called245 Manual.</p><p>Debugger·emulates·the·stack·trace·by·keeping·track·of·recently·called
246 interpreted·functions.·(The·real·stack·trace·cannot·be·used,·as·it·shows·which246 interpreted·functions.·(The·real·stack·trace·cannot·be·used,·as·it·shows·which
247 functions·of·Debugger·have·been·called,·rather·than·which·interpreted247 functions·of·Debugger·have·been·called,·rather·than·which·interpreted
248 functions.)</p><p>This·information·can·be·used·to·traverse·the·chain·of·function·calls,·using·the248 functions.)</p><p>This·information·can·be·used·to·traverse·the·chain·of·function·calls,·using·the
249 <em>Up</em>·and·<em>Down</em>·buttons·in·the249 <em>Up</em>·and·<em>Down</em>·buttons·in·the
250 <a·href="debugger_chapter.html#attach">Attach·Process·window</a>.</p><p>By·default,·Debugger·only·saves·information·about·recursive·function·calls,·that250 <a·href="debugger_chapter.html#attach">Attach·Process·window</a>.</p><p>By·default,·Debugger·only·saves·information·about·recursive·function·calls,·that
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543 ······<p·class="built-using">543 ······<p·class="built-using">
544 ········Built·using544 ········Built·using
545 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the545 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
546 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>546 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
547 ······</p>547 ······</p>
548 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>548 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
549 ····</footer>549 ····</footer>
550 ··</div>550 ··</div>
551 </main>551 </main>
552 </div>552 </div>
553 <script>553 <script>
554 ··function·mermaidLoaded()·{554 ··function·mermaidLoaded()·{
555 ····mermaid.initialize({555 ····mermaid.initialize({
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130 ····<section·id="moduledoc">130 ····<section·id="moduledoc">
131 <p>Debugger/Interpreter·Interface.</p><p>The·<code·class="inline">i</code>·module·provides·short·forms·for·some·of·the·functions·used·by·the131 <p>Debugger/Interpreter·Interface.</p><p>The·<code·class="inline">i</code>·module·provides·short·forms·for·some·of·the·functions·used·by·the
132 graphical·Debugger·and·some·of·the·functions·in·module·<a·href="int.html"><code·class="inline">int</code></a>,·the·Erlang132 graphical·Debugger·and·some·of·the·functions·in·module·<a·href="int.html"><code·class="inline">int</code></a>,·the·Erlang
133 interpreter.</p><p>This·module·also·provides·facilities·for·displaying·status·information·about133 interpreter.</p><p>This·module·also·provides·facilities·for·displaying·status·information·about
134 interpreted·processes·and·break·points.</p><p>It·is·possible·to·attach·to·interpreted·processes·by·only·giving·the·corresponding134 interpreted·processes·and·break·points.</p><p>It·is·possible·to·attach·to·interpreted·processes·by·only·giving·the·corresponding
135 process·identity.·By·default,·an·attachment·window·is·displayed.·Processes135 process·identity.·By·default,·an·attachment·window·is·displayed.·Processes
136 at·other·Erlang·nodes·can·be·attached·manually·or·automatically.</p><p>The·functions·in·this·module·are·defined·in·the·Erlang·shell.·That·is,136 at·other·Erlang·nodes·can·be·attached·manually·or·automatically.</p><p>The·functions·in·this·module·are·defined·in·the·Erlang·shell.·That·is,
137 they·can·be·called·without·the·<code·class="inline">i:</code>·prefix.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">ii</span><span·class="p"·data-group-id="3430493843-1">(</span><span·class="ss">t</span><span·class="p"·data-group-id="3430493843-1">)</span><span·class="p">.</span><span·class="w">137 they·can·be·called·without·the·<code·class="inline">i:</code>·prefix.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">ii</span><span·class="p"·data-group-id="0507334083-1">(</span><span·class="ss">t</span><span·class="p"·data-group-id="0507334083-1">)</span><span·class="p">.</span><span·class="w">
138 </span><span·class="p"·data-group-id="3430493843-2">{</span><span·class="ss">module</span><span·class="p">,</span><span·class="ss">t</span><span·class="p"·data-group-id="3430493843-2">}</span><span·class="gp·unselectable">138 </span><span·class="p"·data-group-id="0507334083-2">{</span><span·class="ss">module</span><span·class="p">,</span><span·class="ss">t</span><span·class="p"·data-group-id="0507334083-2">}</span><span·class="gp·unselectable">
139 2&gt;·</span><span·class="nf">iaa</span><span·class="p"·data-group-id="3430493843-3">(</span><span·class="p"·data-group-id="3430493843-4">[</span><span·class="ss">init</span><span·class="p"·data-group-id="3430493843-4">]</span><span·class="p"·data-group-id="3430493843-3">)</span><span·class="p">.</span><span·class="w">139 2&gt;·</span><span·class="nf">iaa</span><span·class="p"·data-group-id="0507334083-3">(</span><span·class="p"·data-group-id="0507334083-4">[</span><span·class="ss">init</span><span·class="p"·data-group-id="0507334083-4">]</span><span·class="p"·data-group-id="0507334083-3">)</span><span·class="p">.</span><span·class="w">
140 </span><span·class="ss">true</span></code></pre>140 </span><span·class="ss">true</span></code></pre>
141 ····</section>141 ····</section>
  
142 </div>142 </div>
  
143 ··<section·id="summary"·class="details-list">143 ··<section·id="summary"·class="details-list">
144 ····<h1·class="section-heading">144 ····<h1·class="section-heading">
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1289 ········Built·using1289 ········Built·using
1290 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1290 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1291 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1291 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1292 ······</p>1292 ······</p>
1293 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1293 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1294 ····</footer>1294 ····</footer>
1295 ··</div>1295 ··</div>
1296 </main>1296 </main>
1297 </div>1297 </div>
1298 <script>1298 <script>
1299 ··function·mermaidLoaded()·{1299 ··function·mermaidLoaded()·{
1300 ····mermaid.initialize({1300 ····mermaid.initialize({
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670 ·························Args·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>670 ·························Args·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>
  
671 ······</div>671 ······</div>
  
672 <p>Sets·when·and·how·to·attach·automatically·to·a·process·executing·code672 <p>Sets·when·and·how·to·attach·automatically·to·a·process·executing·code
673 in·interpreted·modules.</p><p>By·default·when·the·interpreter·is·started,·automatic·attach·is·disabled.</p><p>If·<code·class="inline">Flags</code>·is·an·empty·list,·automatic·attach·is·disabled.</p><p>Otherwise·<code·class="inline">Flags</code>·should·be·a·list·containing··at·least·one·of·the·following673 in·interpreted·modules.</p><p>By·default·when·the·interpreter·is·started,·automatic·attach·is·disabled.</p><p>If·<code·class="inline">Flags</code>·is·an·empty·list,·automatic·attach·is·disabled.</p><p>Otherwise·<code·class="inline">Flags</code>·should·be·a·list·containing··at·least·one·of·the·following
674 flags:</p><ul><li><code·class="inline">init</code>·-·Attach·when·a·process·for·the·first·time·calls·an·interpreted674 flags:</p><ul><li><code·class="inline">init</code>·-·Attach·when·a·process·for·the·first·time·calls·an·interpreted
675 function.</li><li><code·class="inline">break</code>·-·Attach·whenever·a·process·reaches·a·breakpoint.</li><li><code·class="inline">exit</code>·-·Attach·when·a·process·terminates.</li></ul><p>When·the·specified·event·occurs,·the·function·<code·class="inline">Function</code>·is·called·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">spawn</span><span·class="p"·data-group-id="0000480525-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0000480525-2">[</span><span·class="n">Pid</span><sp[·...·truncated·by·diffoscope;·len:·190,·SHA:·b494d700f4dda5a16bf09c3edeb7bb0722286e556a1b682883e7edfbb8d72b9e·...·]-1">)</span></code></pre><p><code·class="inline">Pid</code>·is·the·pid·of·the·process·executing·interpreted·code.</p>675 function.</li><li><code·class="inline">break</code>·-·Attach·whenever·a·process·reaches·a·breakpoint.</li><li><code·class="inline">exit</code>·-·Attach·when·a·process·terminates.</li></ul><p>When·the·specified·event·occurs,·the·function·<code·class="inline">Function</code>·is·called·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">spawn</span><span·class="p"·data-group-id="7924764357-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7924764357-2">[</span><span·class="n">Pid</span><sp[·...·truncated·by·diffoscope;·len:·190,·SHA:·70e68436137e23655d42f101c8a11f4c1140b1564f9e5aaf4f4bce58f109e785·...·]-1">)</span></code></pre><p><code·class="inline">Pid</code>·is·the·pid·of·the·process·executing·interpreted·code.</p>
676 ··</section>676 ··</section>
677 </section>677 </section>
678 <section·class="detail"·id="break/2">678 <section·class="detail"·id="break/2">
  
679 ··<div·class="detail-header">679 ··<div·class="detail-header">
680 ····<a·href="#break/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">680 ····<a·href="#break/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
681 ······<i·class="ri-link-m"·aria-hidden="true"></i>681 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1403 ······</p>1403 ······</p>
1404 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1404 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1405 ····</footer>1405 ····</footer>
1406 ··</div>1406 ··</div>
1407 </main>1407 </main>
1408 </div>1408 </div>
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191 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>191 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
192 ······</p>192 ······</p>
193 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>193 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
194 ····</footer>194 ····</footer>
195 ··</div>195 ··</div>
196 </main>196 </main>
197 </div>197 </div>
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135 ··<a·href="#fixed-bugs-and-malfunctions"·class="hover-link">135 ··<a·href="#fixed-bugs-and-malfunctions"·class="hover-link">
136 ····<i·class="ri-link-m"·aria-hidden="true"></i>136 ····<i·class="ri-link-m"·aria-hidden="true"></i>
137 ··</a>137 ··</a>
138 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>138 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>
139 </h3>139 </h3>
140 <ul><li><p>Defining·a·fun·in·the·shell·using·the·syntax·<code·class="inline">fun·Name/Arity</code>·would·fail.·This·has·been·corrected·so·that·the·following·now·works:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nb">is_atom</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">140 <ul><li><p>Defining·a·fun·in·the·shell·using·the·syntax·<code·class="inline">fun·Name/Arity</code>·would·fail.·This·has·been·corrected·so·that·the·following·now·works:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nb">is_atom</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
141 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">141 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">
142 &gt;·</span><span·class="n">F</span><span·class="p"·data-group-id="1948155556-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="1948155556-1">)</span><span·class="p">.</span><span·class="w">142 &gt;·</span><span·class="n">F</span><span·class="p"·data-group-id="3410908559-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="3410908559-1">)</span><span·class="p">.</span><span·class="w">
143 </span><span·class="ss">true</span><span·class="gp·unselectable">143 </span><span·class="ss">true</span><span·class="gp·unselectable">
144 3&gt;·</span><span·class="n">Id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">id</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">144 3&gt;·</span><span·class="n">Id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">id</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
145 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">145 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">
146 4&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="1948155556-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="1948155556-2">)</span><span·class="p">.</span><span·class="w">146 4&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="3410908559-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="3410908559-2">)</span><span·class="p">.</span><span·class="w">
147 </span><span·class="gt">**·exception·error:·undefined·shell·command·id/1</span><span·class="gp·unselectable">147 </span><span·class="gt">**·exception·error:·undefined·shell·command·id/1</span><span·class="gp·unselectable">
148 5&gt;·</span><span·class="nf">id</span><span·class="p"·data-group-id="1948155556-3">(</span><span·class="n">I</span><span·class="p"·data-group-id="1948155556-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">I</span><span·class="p">.</span><span·class="w">148 5&gt;·</span><span·class="nf">id</span><span·class="p"·data-group-id="3410908559-3">(</span><span·class="n">I</span><span·class="p"·data-group-id="3410908559-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">I</span><span·class="p">.</span><span·class="w">
149 </span><span·class="ss">ok</span><span·class="gp·unselectable">149 </span><span·class="ss">ok</span><span·class="gp·unselectable">
150 6&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="1948155556-4">(</span><span·class="mi">42</span><span·class="p"·data-group-id="1948155556-4">)</span><span·class="p">.</span><span·class="w">150 6&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="3410908559-4">(</span><span·class="mi">42</span><span·class="p"·data-group-id="3410908559-4">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="mi">42</span></code></pre><p>The·Debugger·has·also·been·corrected·to·correctly·handle·this·syntax·for·a·BIF.</p><p>Own·Id:·OTP-19322·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8963"·title="">GH-8963</a>,·<a·href="https://github.com/erlang/otp/pull/8987"·title="">PR-8987</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">151 </span><span·class="mi">42</span></code></pre><p>The·Debugger·has·also·been·corrected·to·correctly·handle·this·syntax·for·a·BIF.</p><p>Own·Id:·OTP-19322·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8963"·title="">GH-8963</a>,·<a·href="https://github.com/erlang/otp/pull/8987"·title="">PR-8987</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">
152 ··<a·href="#improvements-and-new-features"·class="hover-link">152 ··<a·href="#improvements-and-new-features"·class="hover-link">
153 ····<i·class="ri-link-m"·aria-hidden="true"></i>153 ····<i·class="ri-link-m"·aria-hidden="true"></i>
154 ··</a>154 ··</a>
155 ··<span·class="text">Improvements·and·New·Features</span>155 ··<span·class="text">Improvements·and·New·Features</span>
156 </h3>156 </h3>
157 <ul><li><p>Erlang/OTP·type·specifications·has·been·updated·to·eliminate·overlapping·domains.</p><p>Own·Id:·OTP-19310·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8810"·title="">GH-8810</a>,·<a·href="https://github.com/erlang/otp/issues/8821"·title="">GH-8821</a>,·<a·href="https://github.com/erlang/otp/pull/8986"·title="">PR-8986</a></p></li></ul><h2·id="debugger-5-4"·class="section-heading">157 <ul><li><p>Erlang/OTP·type·specifications·has·been·updated·to·eliminate·overlapping·domains.</p><p>Own·Id:·OTP-19310·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8810"·title="">GH-8810</a>,·<a·href="https://github.com/erlang/otp/issues/8821"·title="">GH-8821</a>,·<a·href="https://github.com/erlang/otp/pull/8986"·title="">PR-8986</a></p></li></ul><h2·id="debugger-5-4"·class="section-heading">
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992 ······</p>992 ······</p>
993 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>993 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
994 ····</footer>994 ····</footer>
995 ··</div>995 ··</div>
996 </main>996 </main>
997 </div>997 </div>
998 <script>998 <script>
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146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
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149 </main>149 </main>
150 </div>150 </div>
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149 ····</footer>149 ····</footer>
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187 ····</footer>187 ····</footer>
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190 </div>190 </div>
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266 the·value·is·a·list,·it·is·used·as·is.·If·it·is·not·a·list,·it·is·put·into·a266 the·value·is·a·list,·it·is·used·as·is.·If·it·is·not·a·list,·it·is·put·into·a
267 list.</p><p>The·list·is·appended·to·any·options·given·to·<a·href="#run/1"><code·class="inline">run/1</code></a>·or·on·the·command·line.</p><p>The·list·can·be·retrieved·with·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html#env_compiler_options/0"><code·class="inline">compile:env_compiler_options/0</code></a>.</p><p>Currently·the·only·option·used·is·the267 list.</p><p>The·list·is·appended·to·any·options·given·to·<a·href="#run/1"><code·class="inline">run/1</code></a>·or·on·the·command·line.</p><p>The·list·can·be·retrieved·with·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html#env_compiler_options/0"><code·class="inline">compile:env_compiler_options/0</code></a>.</p><p>Currently·the·only·option·used·is·the
268 <a·href="dialyzer.html#error_location"><code·class="inline">error_location</code></a>·option.</p><p><em>Dialyzer·configuration·file:</em></p><p>Dialyzer's·configuration·file·may·also·be·used·to·augment·the·default·options268 <a·href="dialyzer.html#error_location"><code·class="inline">error_location</code></a>·option.</p><p><em>Dialyzer·configuration·file:</em></p><p>Dialyzer's·configuration·file·may·also·be·used·to·augment·the·default·options
269 and·those·given·directly·to·the·Dialyzer·command.·It·is·commonly·used·to·avoid269 and·those·given·directly·to·the·Dialyzer·command.·It·is·commonly·used·to·avoid
270 repeating·options·which·would·otherwise·need·to·be·given·explicitly·to·Dialyzer270 repeating·options·which·would·otherwise·need·to·be·given·explicitly·to·Dialyzer
271 on·every·invocation.</p><p>The·location·of·the·configuration·file·can·be·set·via·the·<code·class="inline">DIALYZER_CONFIG</code>271 on·every·invocation.</p><p>The·location·of·the·configuration·file·can·be·set·via·the·<code·class="inline">DIALYZER_CONFIG</code>
272 environment·variable,·and·defaults·to·within·the·<code·class="inline">user_config</code>·from272 environment·variable,·and·defaults·to·within·the·<code·class="inline">user_config</code>·from
273 <a·href="../../../../lib/stdlib-6.2.2/doc/html/filename.html#basedir/3"><code·class="inline">filename:basedir/3</code></a>.</p><p>An·example·configuration·file's·contents·might·be:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="0012543939-1">{</span><span·class="ss">incremental</span><span·class="p">,</span><span·class="w">273 <a·href="../../../../lib/stdlib-6.2.2/doc/html/filename.html#basedir/3"><code·class="inline">filename:basedir/3</code></a>.</p><p>An·example·configuration·file's·contents·might·be:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="1357424611-1">{</span><span·class="ss">incremental</span><span·class="p">,</span><span·class="w">
274 ········</span><span·class="p"·data-group-id="0012543939-2">{</span><span·class="ss">default_apps</span><span·class="p">,</span><span·class="p"·data-group-id="0012543939-3">[</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·109,·SHA:·f317e08f32a2aa1b9c29a4bf1dabbea0d8fc4596bbbf65ea4f1597e9759e28df·...·]-2">}</span><span·class="p">,</span><span·class="w">274 ········</span><span·class="p"·data-group-id="1357424611-2">{</span><span·class="ss">default_apps</span><span·class="p">,</span><span·class="p"·data-group-id="1357424611-3">[</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·109,·SHA:·6ebcaf8eada03e6564647a526f812a66aacf7ac5fe955bd885b068b2cf548d13·...·]-2">}</span><span·class="p">,</span><span·class="w">
275 ········</span><span·class="p"·data-group-id="0012543939-4">{</span><span·class="ss">default_warning_apps</span><span·class="p">,</span><span·class="p"·data-group-id="0012543939-5">[</span><span·class="ss">stdlib</span><span·class="p"·data-group-id="0012543939-5">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·f87cd2cf9c84f14cc89ff61fc05e869d4d73542f0b95addcf30d736e92ece010·...·]-4">}</span><span·class="w">275 ········</span><span·class="p"·data-group-id="1357424611-4">{</span><span·class="ss">default_warning_apps</span><span·class="p">,</span><span·class="p"·data-group-id="1357424611-5">[</span><span·class="ss">stdlib</span><span·class="p"·data-group-id="1357424611-5">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·8196113d849180967ac830904220db41cbfb9cab5e8cb84a8ead522129bb4297·...·]-4">}</span><span·class="w">
276 ······</span><span·class="p"·data-group-id="0012543939-1">}</span><span·class="p">.</span><span·class="w">276 ······</span><span·class="p"·data-group-id="1357424611-1">}</span><span·class="p">.</span><span·class="w">
277 ······</span><span·class="p"·data-group-id="0012543939-6">{</span><span·class="ss">warnings</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0012543939-7">[</span><span·class="ss">no_improper_lists</span><span·class="p"·data-group-id="0012543939-7">]</span><span·class="p"·data-group-id="0012543939-6">}</span><span·class="p">.</span><span·class="w"> 
278 ······</span><span·class="p"·data-group-id="0012543939-8">{</span><span·class="ss">add_pathsa</span><span·class="p">,</span><span·class="p"·data-group-id="0012543939-9">[</span><span·class="s">&quot;/users/samwise/potatoes/ebin&quot;</span><span·class="p"·data-group-id="0012543939-9">]</span><span·class="p"·data-group-id="0012543939-8">}</span><span·class="p">.</span><span·class="w"> 
279 ······</span><span·class="p"·data-group-id="0012543939-10">{</span><span·class="ss">add_pathsz</span><span·class="p">,</span><span·class="p"·data-group-id="0012543939-11">[</span><span·class="s">&quot;/users/smeagol/fish/ebin&quot;</span><span·class="p"·data-group-id="0012543939-11">]</span><span·cl[·...·truncated·by·diffoscope;·len:·211,·SHA:·5491246a69168b9be4a03dc5d83a124d942d863458d64648f4b5b139dc285c93·...·]">277 ······</span><span·class="p"·data-group-id="1357424611-6">{</span><span·class="ss">warnings</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1357424611-7">[</span><span·class="ss">no_improper_lists</span><span·class="p"·data-group-id="1357424611-7">]</span><span·c[·...·truncated·by·diffoscope;·len:·84,·SHA:·3e9c40d3f0acf2bec2d1eea9e724d5a5e51298c2aa127341127cd60ec21eb572·...·]">
 278 ······</span><span·class="p"·data-group-id="1357424611-8">{</span><span·class="ss">add_pathsa</span><span·class="p">,</span><span·class="p"·data-group-id="1357424611-9">[</span><span·class="s">&quot;/users/samwise/potatoes/ebin&quot;</span><span·class="p"·data-group-id="1357424611-9">]</span><span·class="p"·data-group-id="1357424611-8">}</span><span·class="p">.</span><span·class="w">
 279 ······</span><span·class="p"·data-group-id="1357424611-10">{</span><span·class="ss">add_pathsz</span><span·class="p">,</span><span·class="p"·data-group-id="1357424611-11">[</span><span·class="s">&quot;/users/smeagol/fish/ebin&quot;</span><span·class="p"·data-group-id="1357424611-11">]</span><span·class="p"·data-group-id="1357424611-10">}</span><span·class="p">.</span></code></pre><p><a·href=""·id="suppression"></a></p><h2·id="module-requesting-or-suppressing-warnings-in-source-files"·class="section-heading">
280 ··<a·href="#module-requesting-or-suppressing-warnings-in-source-files"·class="hover-link">280 ··<a·href="#module-requesting-or-suppressing-warnings-in-source-files"·class="hover-link">
281 ····<i·class="ri-link-m"·aria-hidden="true"></i>281 ····<i·class="ri-link-m"·aria-hidden="true"></i>
282 ··</a>282 ··</a>
283 ··<span·class="text">Requesting·or·Suppressing·Warnings·in·Source·Files</span>283 ··<span·class="text">Requesting·or·Suppressing·Warnings·in·Source·Files</span>
284 </h2>284 </h2>
285 <p>Attribute·<code·class="inline">-dialyzer()</code>·can·be·used·for·turning·off·warnings·in·a·module·by285 <p>Attribute·<code·class="inline">-dialyzer()</code>·can·be·used·for·turning·off·warnings·in·a·module·by
286 specifying·functions·or·warning·options.·For·example,·to·turn·off·all·warnings286 specifying·functions·or·warning·options.·For·example,·to·turn·off·all·warnings
287 for·the·function·<code·class="inline">f/0</code>,·include·the·following·line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">dialyzer</span><span·class="p"·data-group-id="8830482911-1">(</span><span·class="p"·data-group-id="8830482911-2">{</span><span·class="ss">nowarn_function</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·73,·SHA:·a75899cd08c348c1534bb6ed3d78ff3653fe8f6f0d02a553dbdeb1b3c1125660·...·]-1">)</span><span·class="p">.</span></code></pre><p>To·turn·off·warnings·for·improper·lists,·add·the·following·line·to·the·source287 for·the·function·<code·class="inline">f/0</code>,·include·the·following·line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">dialyzer</span><span·class="p"·data-group-id="8648901534-1">(</span><span·class="p"·data-group-id="8648901534-2">{</span><span·class="ss">nowarn_function</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·73,·SHA:·4e576788974dd881cf73548a2ad1501fa8fa9644aeae3b579d8127c1c66573bf·...·]-1">)</span><span·class="p">.</span></code></pre><p>To·turn·off·warnings·for·improper·lists,·add·the·following·line·to·the·source
288 file:</p><pre><code·class="text">-dialyzer(no_improper_lists).</code></pre><p>Attribute·<code·class="inline">-dialyzer()</code>·is·allowed·after·function·declarations.·Lists·of·warning288 file:</p><pre><code·class="text">-dialyzer(no_improper_lists).</code></pre><p>Attribute·<code·class="inline">-dialyzer()</code>·is·allowed·after·function·declarations.·Lists·of·warning
289 options·or·functions·are·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">dialyzer</span><span·class="p"·data-group-id="8928840800-1">(</span><span·class="p"·data-group-id="8928840800-2">[</span><span·class="p"·data-group-id="8928840800-3">{</span><span·class="ss">nowarn_function</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8928840800[·...·truncated·by·diffoscope;·len:·1866,·SHA:·ccd7b9d015dcfaf51892cd670d561f83e9d616bb8e0240e22a3839f18baa89c3·...·]7-1">)</span><span·class="p">.</span></code></pre><p>The·warning·option·for·underspecified·functions,·<code·class="inline">-Wunderspecs</code>,·can·result·in289 options·or·functions·are·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">dialyzer</span><span·class="p"·data-group-id="1002900027-1">(</span><span·class="p"·data-group-id="1002900027-2">[</span><span·class="p"·data-group-id="1002900027-3">{</span><span·class="ss">nowarn_function</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1002900027[·...·truncated·by·diffoscope;·len:·1866,·SHA:·3ea1de5dddcbde5da953da7c2bee11605c471ef4208bd2bde7c90d1ccae2ff00·...·]7-1">)</span><span·class="p">.</span></code></pre><p>The·warning·option·for·underspecified·functions,·<code·class="inline">-Wunderspecs</code>,·can·result·in
290 useful·warnings,·but·often·functions·with·specifications·that·are·strictly·more290 useful·warnings,·but·often·functions·with·specifications·that·are·strictly·more
291 allowing·than·the·success·typing·cannot·easily·be·modified·to·be·less·allowing.291 allowing·than·the·success·typing·cannot·easily·be·modified·to·be·less·allowing.
292 To·turn·off·the·warning·for·underspecified·function·<code·class="inline">f/0</code>,·include·the·following292 To·turn·off·the·warning·for·underspecified·function·<code·class="inline">f/0</code>,·include·the·following
293 line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">dialyzer</span><span·class="p"·data-group-id="4629965104-1">(</span><span·class="p"·data-group-id="4629965104-2">{</span><span·class="ss">no_underspecs</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·72,·SHA:·b8b48c8216bf9bbc1e630f74f8a28f0f47af794597d5a9c0bec7c42b1e8cc573·...·]-1">)</span><span·class="p">.</span></code></pre><p>For·help·on·the·warning·options,·use·<code·class="inline">dialyzer·-Whelp</code>.·The·options·are·also293 line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">dialyzer</span><span·class="p"·data-group-id="6009965330-1">(</span><span·class="p"·data-group-id="6009965330-2">{</span><span·class="ss">no_underspecs</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·72,·SHA:·59e1c890f73a227de8fb2b1ebb4473228456a91cdb1dcfad451ea163b0b3ee07·...·]-1">)</span><span·class="p">.</span></code></pre><p>For·help·on·the·warning·options,·use·<code·class="inline">dialyzer·-Whelp</code>.·The·options·are·also
294 enumerated,·see·type·<a·href="#t:warn_option/0"><code·class="inline">warn_option/0</code></a>.</p><p>Attribute·<code·class="inline">-dialyzer()</code>·can·also·be·used·for·turning·on·warnings.·For·example,294 enumerated,·see·type·<a·href="#t:warn_option/0"><code·class="inline">warn_option/0</code></a>.</p><p>Attribute·<code·class="inline">-dialyzer()</code>·can·also·be·used·for·turning·on·warnings.·For·example,
295 if·a·module·has·been·fixed·regarding·unmatched·returns,·adding·the·following295 if·a·module·has·been·fixed·regarding·unmatched·returns,·adding·the·following
296 line·can·help·in·assuring·that·no·new·unmatched·return·warnings·are·introduced:</p><pre><code·class="text">-dialyzer(unmatched_returns).</code></pre>296 line·can·help·in·assuring·that·no·new·unmatched·return·warnings·are·introduced:</p><pre><code·class="text">-dialyzer(unmatched_returns).</code></pre>
297 ····</section>297 ····</section>
  
298 </div>298 </div>
  
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854 ······<p·class="built-using">854 ······<p·class="built-using">
855 ········Built·using855 ········Built·using
856 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the856 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
857 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>857 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
858 ······</p>858 ······</p>
859 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>859 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
860 ····</footer>860 ····</footer>
861 ··</div>861 ··</div>
862 </main>862 </main>
863 </div>863 </div>
864 <script>864 <script>
865 ··function·mermaidLoaded()·{865 ··function·mermaidLoaded()·{
866 ····mermaid.initialize({866 ····mermaid.initialize({
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205 spec·is·invalid·with·respect·to·the·implementation.·However,·if·they·do·overlap,205 spec·is·invalid·with·respect·to·the·implementation.·However,·if·they·do·overlap,
206 Dialyzer·will·proceed·under·the·assumption·that·the·correct·type·for·the·given206 Dialyzer·will·proceed·under·the·assumption·that·the·correct·type·for·the·given
207 function·is·the·intersection·of·the·inferred·type·and·the·specified·type·(the207 function·is·the·intersection·of·the·inferred·type·and·the·specified·type·(the
208 rationale·being·that·the·user·may·know·something·that·Dialyzer·itself·cannot208 rationale·being·that·the·user·may·know·something·that·Dialyzer·itself·cannot
209 deduce).·One·implication·of·this·is·that·if·the·user·gives·a·spec·for·a·function209 deduce).·One·implication·of·this·is·that·if·the·user·gives·a·spec·for·a·function
210 which·overlaps·with·Dialyzer's·inferred·type,·but·is·more·restrictive,·Dialyzer210 which·overlaps·with·Dialyzer's·inferred·type,·but·is·more·restrictive,·Dialyzer
211 will·trust·those·restrictions.·This·may·then·generate·an·error·elsewhere·that211 will·trust·those·restrictions.·This·may·then·generate·an·error·elsewhere·that
212 follows·from·the·erroneously·restricted·spec.</p><p><em>Examples:</em></p><p>Non-overlapping·argument:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="4497397332-1">(</span><span·class="nf">boolean</span><span·class="p"·data-group-id="4497397332-2">(</span><span·class="p"·data-group-id="4497397332-2">)</span><span·class="p"·data-group-id="4497397332-1">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·156,·SHA:·043bd94d46fffa488fb586132c57c52a9d4b2756d1d67b22f5028a3ebd9d74f9·...·]-3">)</span><span·class="p">.</span><span·class="w">212 follows·from·the·erroneously·restricted·spec.</p><p><em>Examples:</em></p><p>Non-overlapping·argument:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="7338583140-1">(</span><span·class="nf">boolean</span><span·class="p"·data-group-id="7338583140-2">(</span><span·class="p"·data-group-id="7338583140-2">)</span><span·class="p"·data-group-id="7338583140-1">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·156,·SHA:·fb2ba26e7010d044fcac70510b9f6ec6a9dafe4a194ff0a9c321cd490c7ed710·...·]-3">)</span><span·class="p">.</span><span·class="w">
213 </span><span·class="c1">%%·Dialyzer·will·infer:·foo(integer())·-&gt;·string().</span><span·class="w">213 </span><span·class="c1">%%·Dialyzer·will·infer:·foo(integer())·-&gt;·string().</span><span·class="w">
214 </span><span·class="nf">foo</span><span·class="p"·data-group-id="4497397332-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="4497397332-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 </span><span·class="nf">foo</span><span·class="p"·data-group-id="7338583140-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="7338583140-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ····</span><span·class="nf">integer_to_list</span><span·class="p"·data-group-id="4497397332-5">(</span><span·class="n">N</span><span·class="p"·data-group-id="4497397332-5">)</span><span·class="p">.</span></code></pre><p>Since·the·type·of·the·argument·in·the·spec·is·different·from·the·type·that215 ····</span><span·class="nf">integer_to_list</span><span·class="p"·data-group-id="7338583140-5">(</span><span·class="n">N</span><span·class="p"·data-group-id="7338583140-5">)</span><span·class="p">.</span></code></pre><p>Since·the·type·of·the·argument·in·the·spec·is·different·from·the·type·that
216 Dialyzer·inferred,·Dialyzer·will·generate·the·following·warning:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">some_module</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">7</span><span·class="p">:</span><span·class="mi">2</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Invalid</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><span·class="ss">specification</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">216 Dialyzer·inferred,·Dialyzer·will·generate·the·following·warning:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">some_module</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">7</span><span·class="p">:</span><span·class="mi">2</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Invalid</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><span·class="ss">specification</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="ss">foo</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
217 ·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">success</span><span·class="w">·</span><span·class="ss">typing</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">foo</span><span·class="w">217 ·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">success</span><span·class="w">·</span><span·class="ss">typing</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">foo</span><span·class="w">
218 ··········</span><span·class="p"·data-group-id="7122719378-1">(</span><span·class="nf">integer</span><span·class="p"·data-group-id="7122719378-2">(</span><span·class="p"·data-group-id="7122719378-2">)</span><span·class="p"·data-group-id="7122719378-1">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·156,·SHA:·8686c231286317af91ceff3869969b3c6ca9c9c5a8b3daad967dd8c26acc5e01·...·]-3">)</span><span·class="w">218 ··········</span><span·class="p"·data-group-id="5848609786-1">(</span><span·class="nf">integer</span><span·class="p"·data-group-id="5848609786-2">(</span><span·class="p"·data-group-id="5848609786-2">)</span><span·class="p"·data-group-id="5848609786-1">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·156,·SHA:·ab09bc93b603d0dbea64a8ab2fbd111dcddeb21673b099c82b65bd8170bbf29c·...·]-3">)</span><span·class="w">
219 ·</span><span·class="n">But</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">spec</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">foo</span><span·class="w">219 ·</span><span·class="n">But</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">spec</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">foo</span><span·class="w">
220 ··········</span><span·class="p"·data-group-id="7122719378-4">(</span><span·class="nf">boolean</span><span·class="p"·data-group-id="7122719378-5">(</span><span·class="p"·data-group-id="7122719378-5">)</span><span·class="p"·data-group-id="7122719378-4">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·156,·SHA:·2fafddf16cc838d5d815b61a6bf5dbc84e48506d4394647b7a85f0b9f4e89edb·...·]-6">)</span><span·class="w">220 ··········</span><span·class="p"·data-group-id="5848609786-4">(</span><span·class="nf">boolean</span><span·class="p"·data-group-id="5848609786-5">(</span><span·class="p"·data-group-id="5848609786-5">)</span><span·class="p"·data-group-id="5848609786-4">)</span><span·class="w">·</span><span·class="p">-&gt[·...·truncated·by·diffoscope;·len:·156,·SHA:·259d706684586276ede239715db774cceb606042c2b221b187e212653d85d393·...·]-6">)</span><span·class="w">
221 ·</span><span·class="n">They</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">overlap</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="mi">1</span><span·class="ss">st</span><span·class="w">·</span><span·class="ss">argument</span></code></pre><p>Non-overlapping·return:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">bar</span><span·class="p"·data-group-id="7266282314-1">(</span><span·class="ss">a</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="7266282314-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·cl[·...·truncated·by·diffoscope;·len:·138,·SHA:·c4443d8dc424ec23b1fc14dd046e2fc65aeb352a89199a7df72889f32b563e17·...·]-2">)</span><span·class="p">.</span><span·class="w">221 ·</span><span·class="n">They</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">overlap</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="mi">1</span><span·class="ss">st</span><span·class="w">·</span><span·class="ss">argument</span></code></pre><p>Non-overlapping·return:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">bar</span><span·class="p"·data-group-id="7605282305-1">(</span><span·class="ss">a</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="7605282305-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·cl[·...·truncated·by·diffoscope;·len:·138,·SHA:·5edb045325c756fdf188856147404a33bca464f6fcc26fd502e07c7d905ba359·...·]-2">)</span><span·class="p">.</span><span·class="w">
222 </span><span·class="c1">%%·Dialyzer·will·infer:·bar(a·|·b)·-&gt;·binary().</span><span·class="w">222 </span><span·class="c1">%%·Dialyzer·will·infer:·bar(a·|·b)·-&gt;·binary().</span><span·class="w">
223 </span><span·class="nf">bar</span><span·class="p"·data-group-id="7266282314-3">(</span><span·class="ss">a</span><span·class="p"·data-group-id="7266282314-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7266282314-4">&lt;&lt;</span><span·class="s">&quot;a&quot;</span><span·class="p"·data-group-id="7266282314-4">&gt;&gt;</span><span·class="p">;</span><span·class="w"> 
224 </span><span·class="nf">bar</span><span·class="p"·data-group-id="7266282314-5">(</span><span·class="ss">b</span><span·class="p"·data-group-id="7266282314-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7266282314-6">&lt;&lt;</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·195,·SHA:·2fd9171b5813cc418eb4b22611909dab6ec978a13a6af8cd1f8ff2c4726330a6·...·]223 </span><span·class="nf">bar</span><span·class="p"·data-group-id="7605282305-3">(</span><span·class="ss">a</span><span·class="p"·data-group-id="7605282305-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7605282305-4">&lt;&lt;</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·115,·SHA:·85cfc384c1050edc21b03300d73a9305b2e83b566c6836bd73df9e3e8fb378f2·...·]
 224 </span><span·class="nf">bar</span><span·class="p"·data-group-id="7605282305-5">(</span><span·class="ss">b</span><span·class="p"·data-group-id="7605282305-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7605282305-6">&lt;&lt;</span><span·class="s">&quot;b&quot;</span><span·class="p"·data-group-id="7605282305-6">&gt;&gt;</span><span·class="p">.</span></code></pre><p>Since·the·return·value·in·the·spec·and·the·return·value·inferred·by·Dialyzer·are
225 different,·Dialyzer·will·generate·the·following·warning:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">some_module</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">11</span><span·class="p">:</span><span·class="mi">2</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Invalid</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><span·class="ss">specification</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="ss">bar</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">225 different,·Dialyzer·will·generate·the·following·warning:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">some_module</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">11</span><span·class="p">:</span><span·class="mi">2</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Invalid</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><span·class="ss">specification</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="ss">bar</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
226 ·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">success</span><span·class="w">·</span><span·class="ss">typing</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">bar</span><span·class="w">226 ·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">success</span><span·class="w">·</span><span·class="ss">typing</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">bar</span><span·class="w">
227 ··········</span><span·class="p"·data-group-id="8370004139-1">(</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="8370004139-1">)</span><span·class="w">·</span><span·class="p"[·...·truncated·by·diffoscope;·len:·211,·SHA:·450eca85b177a93e91b60b7ef33554ddb2e779c206790799decc54b0c07b6ba6·...·]-2">&gt;&gt;</span><span·class="w">227 ··········</span><span·class="p"·data-group-id="0873827686-1">(</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="0873827686-1">)</span><span·class="w">·</span><span·class="p"[·...·truncated·by·diffoscope;·len:·211,·SHA:·9c58648dadf7c32a6c5d877afa8808ee27efaf08af8b8a8b989eb388515454ee·...·]-2">&gt;&gt;</span><span·class="w">
228 ·</span><span·class="n">But</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">spec</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">bar</span><span·class="w">228 ·</span><span·class="n">But</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">spec</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="nc">some_module</span><span·class="p">:</span><span·class="nf">bar</span><span·class="w">
229 ··········</span><span·class="p"·data-group-id="8370004139-3">(</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="8370004139-3">)</span><span·class="w">·</span><span·class="p"[·...·truncated·by·diffoscope;·len:·159,·SHA:·55761a10901c19b5d66b849ec8255595ff2584b823dce3915e1dbbd602ed74b5·...·]-4">)</span><span·class="w">229 ··········</span><span·class="p"·data-group-id="0873827686-3">(</span><span·class="ss">&#39;a&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;b&#39;</span><span·class="p"·data-group-id="0873827686-3">)</span><span·class="w">·</span><span·class="p"[·...·truncated·by·diffoscope;·len:·159,·SHA:·a8b0780ee0992b184958d6cf8dd591e1499aedbf05e73715a0bcc492482c6c12·...·]-4">)</span><span·class="w">
230 ·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">return</span><span·class="w">·</span><span·class="ss">types</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">overlap</span></code></pre><p>Overlapping·spec·and·inferred·type:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">baz</span><span·class="p"·data-group-id="7360274722-1">(</span><span·class="ss">a</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="7360274722-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·c[·...·truncated·by·diffoscope;·len:·150,·SHA:·221653e612223654d5913513c601b6c45efe653481bf59994fda3f2741151159·...·]-2">)</span><span·class="p">.</span><span·class="w">230 ·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">return</span><span·class="w">·</span><span·class="ss">types</span><span·class="w">·</span><span·class="ss">do</span><span·class="w">·</span><span·class="ow">not</span><span·class="w">·</span><span·class="ss">overlap</span></code></pre><p>Overlapping·spec·and·inferred·type:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">baz</span><span·class="p"·data-group-id="1506124087-1">(</span><span·class="ss">a</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="1506124087-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·c[·...·truncated·by·diffoscope;·len:·150,·SHA:·4b4e8a6635d49d744577ad9d83472a75f46fea20fa0fe3fa1010c49d042e823e·...·]-2">)</span><span·class="p">.</span><span·class="w">
231 </span><span·class="c1">%%·Dialyzer·will·infer:·baz(b·|·c·|·d)·-&gt;·-1·|·0·|·1.</span><span·class="w">231 </span><span·class="c1">%%·Dialyzer·will·infer:·baz(b·|·c·|·d)·-&gt;·-1·|·0·|·1.</span><span·class="w">
232 </span><span·class="nf">baz</span><span·class="p"·data-group-id="7360274722-3">(</span><span·class="ss">b</span><span·class="p"·data-group-id="7360274722-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">232 </span><span·class="nf">baz</span><span·class="p"·data-group-id="1506124087-3">(</span><span·class="ss">b</span><span·class="p"·data-group-id="1506124087-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">;</span><span·class="w">
233 </span><span·class="nf">baz</span><span·class="p"·data-group-id="7360274722-4">(</span><span·class="ss">c</span><span·class="p"·data-group-id="7360274722-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">;</span><span·class="w">233 </span><span·class="nf">baz</span><span·class="p"·data-group-id="1506124087-4">(</span><span·class="ss">c</span><span·class="p"·data-group-id="1506124087-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">;</span><span·class="w">
234 </span><span·class="nf">baz</span><span·class="p"·data-group-id="7360274722-5">(</span><span·class="ss">d</span><span·class="p"·data-group-id="7360274722-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span></code></pre><p>Dialyzer·will·&quot;trust&quot;·the·spec·and·using·the·intersection·of·the·spec·and234 </span><span·class="nf">baz</span><span·class="p"·data-group-id="1506124087-5">(</span><span·class="ss">d</span><span·class="p"·data-group-id="1506124087-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span></code></pre><p>Dialyzer·will·&quot;trust&quot;·the·spec·and·using·the·intersection·of·the·spec·and
235 inferred·type:</p><pre><code·class="text">baz(b)·-&gt;·0·|·1.</code></pre><p>Notice·how·the·<code·class="inline">c</code>·and·<code·class="inline">d</code>·from·the·argument·to·<code·class="inline">baz/1</code>·and·the·<code·class="inline">-1</code>·in·the235 inferred·type:</p><pre><code·class="text">baz(b)·-&gt;·0·|·1.</code></pre><p>Notice·how·the·<code·class="inline">c</code>·and·<code·class="inline">d</code>·from·the·argument·to·<code·class="inline">baz/1</code>·and·the·<code·class="inline">-1</code>·in·the
236 return·from·the·inferred·type·were·dropped·once·the·spec·and·inferred·type·were236 return·from·the·inferred·type·were·dropped·once·the·spec·and·inferred·type·were
237 intersected.·This·could·result·in·warnings·being·emitted·for·later·functions.</p><p>For·example,·if·<code·class="inline">baz/1</code>·is·called·like·this:</p><pre><code·class="text">call_baz1(A)·-&gt;237 intersected.·This·could·result·in·warnings·being·emitted·for·later·functions.</p><p>For·example,·if·<code·class="inline">baz/1</code>·is·called·like·this:</p><pre><code·class="text">call_baz1(A)·-&gt;
238 ····case·baz(A)·of238 ····case·baz(A)·of
239 ········-1·-&gt;·negative;239 ········-1·-&gt;·negative;
240 ········0·-&gt;·zero;240 ········0·-&gt;·zero;
241 ········1·-&gt;·positive241 ········1·-&gt;·positive
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308 ····</footer>308 ····</footer>
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1892 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1892 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1893 ····</footer>1893 ····</footer>
1894 ··</div>1894 ··</div>
1895 </main>1895 </main>
1896 </div>1896 </div>
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149 </main>149 </main>
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201 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>201 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
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248 ····</footer>248 ····</footer>
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250 </main>250 </main>
251 </div>251 </div>
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698 <p>Invoked·when·a·request·message·is·received·from·a·peer.·The·application·in·which698 <p>Invoked·when·a·request·message·is·received·from·a·peer.·The·application·in·which
699 the·callback·takes·place·(that·is,·the·callback·module·as·configured·with699 the·callback·takes·place·(that·is,·the·callback·module·as·configured·with
700 <a·href="diameter.html#start_service/2"><code·class="inline">diameter:start_service/2</code></a>)·is·determined·by·the·Application·Identifier·in·the700 <a·href="diameter.html#start_service/2"><code·class="inline">diameter:start_service/2</code></a>)·is·determined·by·the·Application·Identifier·in·the
701 header·of·the·incoming·request·message,·the·selected·module·being·the·one·whose701 header·of·the·incoming·request·message,·the·selected·module·being·the·one·whose
702 corresponding·dictionary·declares·itself·as·defining·either·the·application·in702 corresponding·dictionary·declares·itself·as·defining·either·the·application·in
703 question·or·the·Relay·application.</p><p>The·argument·<a·href="#t:packet/0">packet()</a>·has·the·following·signature.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">diameter_packet</span><span·class="p"·data-group-id="1857586991-1">{</span><span·class="ss">header</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">diameter_header</span><span·class="p"·data-group-id="1857586991-2">{</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·f7c09cf5d8286a2f6ff653c3488fcef6347240d3fc02ca15dfe45c90a616ce3c·...·]-2">}</span><span·class="p">,</span><span·class="w">703 question·or·the·Relay·application.</p><p>The·argument·<a·href="#t:packet/0">packet()</a>·has·the·following·signature.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">diameter_packet</span><span·class="p"·data-group-id="7391218209-1">{</span><span·class="ss">header</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">diameter_header</span><span·class="p"·data-group-id="7391218209-2">{</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·46faec13c0b08c6f40b534e9f59fb9a93b86456a67f64b0d1c1837c8c6357242·...·]-2">}</span><span·class="p">,</span><span·class="w">
704 ·················</span><span·class="ss">avps</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1857586991-3">[</span><span·class="o">#</span><span·class="ss">diameter_avp</span><span·class="p"·data-group-id="1857586991-4">{</span><span·class="p"·data-group-id="1857586991-4">}</span><span·class="p"·data-group-id="1857586991-3">]</span><span·class="p">,</span><span·class="w">704 ·················</span><span·class="ss">avps</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7391218209-3">[</span><span·class="o">#</span><span·class="ss">diameter_avp</span><span·class="p"·data-group-id="7391218209-4">{</span><span·class="p"·data-group-id="7391218209-4">}</span><span·class="p"·data-group-id="7391218209-3">]</span><span·class="p">,</span><span·class="w">
705 ·················</span><span·class="ss">msg</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record</span><span·class="p"·data-group-id="1857586991-5">(</span><span·class="p"·data-group-id="1857586991-5">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="w">705 ·················</span><span·class="ss">msg</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record</span><span·class="p"·data-group-id="7391218209-5">(</span><span·class="p"·data-group-id="7391218209-5">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="w">
706 ·················</span><span·class="ss">errors</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1857586991-6">[</span><span·class="n">Unsigned32</span><span·class="p"·data-group-id="1857586991-7">(</span><span·class="p"·data-group-id="1857586991-7">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·479,·SHA:·696a0be7037d4c0512bf7d6539fee465c1e6d32f323f8de8c223e9487ee6474a·...·]-6">]</span><span·class="p">,</span><span·class="w">706 ·················</span><span·class="ss">errors</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7391218209-6">[</span><span·class="n">Unsigned32</span><span·class="p"·data-group-id="7391218209-7">(</span><span·class="p"·data-group-id="7391218209-7">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·479,·SHA:·beccab6293efc8b8bcbcc3a2e4473a5ea5e612c425d3428e67b3c5ae74ccd75c·...·]-6">]</span><span·class="p">,</span><span·class="w">
707 ·················</span><span·class="ss">bin</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="1857586991-11">(</span><span·class="p"·data-group-id="1857586991-11">)</span><span·class="p">,</span><span·class="w">707 ·················</span><span·class="ss">bin</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="7391218209-11">(</span><span·class="p"·data-group-id="7391218209-11">)</span><span·class="p">,</span><span·class="w">
708 ·················</span><span·class="ss">transport_data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="1857586991-12">(</span><span·class="p"·data-group-id="1857586991-12">)</span><span·class="p"·data-group-id="1857586991-1">}</span></code></pre><p>The·<code·class="inline">msg</code>·field·will·be·<code·class="inline">undefined</code>·in·case·the·request·has·been·received·in·the708 ·················</span><span·class="ss">transport_data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="7391218209-12">(</span><span·class="p"·data-group-id="7391218209-12">)</span><span·class="p"·data-group-id="7391218209-1">}</span></code></pre><p>The·<code·class="inline">msg</code>·field·will·be·<code·class="inline">undefined</code>·in·case·the·request·has·been·received·in·the
709 relay·application.·Otherwise·it·contains·the·record·representing·the·request·as709 relay·application.·Otherwise·it·contains·the·record·representing·the·request·as
710 outlined·in·<a·href="diameter_dict.html#MESSAGE_RECORDS">diameter_dict(4)</a>.</p><p>The·<code·class="inline">errors</code>·field·specifies·any·results·codes·identifying·errors·found·while710 outlined·in·<a·href="diameter_dict.html#MESSAGE_RECORDS">diameter_dict(4)</a>.</p><p>The·<code·class="inline">errors</code>·field·specifies·any·results·codes·identifying·errors·found·while
711 decoding·the·request.·This·is·used·to·set·Result-Code·and/or·Failed-AVP·in·a711 decoding·the·request.·This·is·used·to·set·Result-Code·and/or·Failed-AVP·in·a
712 returned·answer·unless·the·callback·returns·a·<code·class="inline">#diameter_packet{}</code>·whose712 returned·answer·unless·the·callback·returns·a·<code·class="inline">#diameter_packet{}</code>·whose
713 <code·class="inline">errors</code>·field·is·set·to·either·a·non-empty·list·of·its·own,·in·which·case·this713 <code·class="inline">errors</code>·field·is·set·to·either·a·non-empty·list·of·its·own,·in·which·case·this
714 list·is·used·instead,·or·the·atom·<code·class="inline">false</code>·to·disable·any·setting·of·Result-Code714 list·is·used·instead,·or·the·atom·<code·class="inline">false</code>·to·disable·any·setting·of·Result-Code
715 and·Failed-AVP.·Note·that·the·errors·detected·by·diameter·are·of·the·3xxx·and715 and·Failed-AVP.·Note·that·the·errors·detected·by·diameter·are·of·the·3xxx·and
Offset 1010, 15 lines modifiedOffset 1010, 15 lines modified
1010 ······<p·class="built-using">1010 ······<p·class="built-using">
1011 ········Built·using1011 ········Built·using
1012 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1012 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1013 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1013 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1014 ······</p>1014 ······</p>
1015 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1015 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1016 ····</footer>1016 ····</footer>
1017 ··</div>1017 ··</div>
1018 </main>1018 </main>
1019 </div>1019 </div>
1020 <script>1020 <script>
1021 ··function·mermaidLoaded()·{1021 ··function·mermaidLoaded()·{
1022 ····mermaid.initialize({1022 ····mermaid.initialize({
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135 encode/decode.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>The·diameter·user·does·not·need·to·call·functions·here·explicitly·when·sending135 encode/decode.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>The·diameter·user·does·not·need·to·call·functions·here·explicitly·when·sending
136 and·receiving·messages·using·<a·href="diameter.html#call/4"><code·class="inline">diameter:call/4</code></a>·and·the·callback·interface136 and·receiving·messages·using·<a·href="diameter.html#call/4"><code·class="inline">diameter:call/4</code></a>·and·the·callback·interface
137 documented·in·<a·href="diameter_app.html"><code·class="inline">diameter_app</code></a>:·diameter·itself·provides·encode/decode·as·a137 documented·in·<a·href="diameter_app.html"><code·class="inline">diameter_app</code></a>:·diameter·itself·provides·encode/decode·as·a
138 consequence·of·configuration·passed·to·<a·href="diameter.html#start_service/2"><code·class="inline">diameter:start_service/2</code></a>,·and·the138 consequence·of·configuration·passed·to·<a·href="diameter.html#start_service/2"><code·class="inline">diameter:start_service/2</code></a>,·and·the
139 results·may·differ·from·those·returned·by·the·functions·documented·here,139 results·may·differ·from·those·returned·by·the·functions·documented·here,
140 depending·on·configuration.</p></section><p>The·<a·href="diameter_codec.html#header">header()</a>·and140 depending·on·configuration.</p></section><p>The·<a·href="diameter_codec.html#header">header()</a>·and
141 <a·href="diameter_codec.html#packet">packet()</a>·records·below·are·defined·in·diameter.hrl,141 <a·href="diameter_codec.html#packet">packet()</a>·records·below·are·defined·in·diameter.hrl,
142 which·can·be·included·as·follows.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3299968878-1">(</span><span·class="s">&quot;diameter/include/diameter.hrl&quot;</span><span·class="p"·data-group-id="3299968878-1">)</span><span·class="p">.</span></code></pre><p>Application-specific·records·are·defined·in·the·hrl·files·resulting·from142 which·can·be·included·as·follows.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3424872180-1">(</span><span·class="s">&quot;diameter/include/diameter.hrl&quot;</span><span·class="p"·data-group-id="3424872180-1">)</span><span·class="p">.</span></code></pre><p>Application-specific·records·are·defined·in·the·hrl·files·resulting·from
143 dictionary·file·compilation.</p><h2·id="module-data-types"·class="section-heading">143 dictionary·file·compilation.</p><h2·id="module-data-types"·class="section-heading">
144 ··<a·href="#module-data-types"·class="hover-link">144 ··<a·href="#module-data-types"·class="hover-link">
145 ····<i·class="ri-link-m"·aria-hidden="true"></i>145 ····<i·class="ri-link-m"·aria-hidden="true"></i>
146 ··</a>146 ··</a>
147 ··<span·class="text">DATA·TYPES</span>147 ··<span·class="text">DATA·TYPES</span>
148 </h2>148 </h2>
149 <ul><li><p><strong><code·class="inline"·id="integers">uint8() ·=·0..255</code></strong></p></li><li><p><strong><code·class="inline">uint24()·=·0..16777215</code></strong></p></li><li><p><strong><code·class="inline">uint32()·=·0..4294967295</code></strong>·-·8-bit,·24-bit·and·32-bit·integers·occurring149 <ul><li><p><strong><code·class="inline"·id="integers">uint8() ·=·0..255</code></strong></p></li><li><p><strong><code·class="inline">uint24()·=·0..16777215</code></strong></p></li><li><p><strong><code·class="inline">uint32()·=·0..4294967295</code></strong>·-·8-bit,·24-bit·and·32-bit·integers·occurring
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545 ······<p·class="built-using">545 ······<p·class="built-using">
546 ········Built·using546 ········Built·using
547 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the547 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
548 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>548 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
549 ······</p>549 ······</p>
550 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>550 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
551 ····</footer>551 ····</footer>
552 ··</div>552 ··</div>
553 </main>553 </main>
554 </div>554 </div>
555 <script>555 <script>
556 ··function·mermaidLoaded()·{556 ··function·mermaidLoaded()·{
557 ····mermaid.initialize({557 ····mermaid.initialize({
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305 (&quot;Derived·AVP·Data·Formats&quot;)·of·RFC·6733·are·encoded·as·values·of·the·types305 (&quot;Derived·AVP·Data·Formats&quot;)·of·RFC·6733·are·encoded·as·values·of·the·types
306 defined·here.·Values·are·passed·to·<a·href="diameter.html#call/4"><code·class="inline">diameter:call/4</code></a>·in·a·request·record·when306 defined·here.·Values·are·passed·to·<a·href="diameter.html#call/4"><code·class="inline">diameter:call/4</code></a>·in·a·request·record·when
307 sending·a·request,·returned·in·a·resulting·answer·record·and·passed·to·a307 sending·a·request,·returned·in·a·resulting·answer·record·and·passed·to·a
308 <a·href="diameter_app.html#c:handle_request/3">handle_request/3</a>·callback·upon·reception·of308 <a·href="diameter_app.html#c:handle_request/3">handle_request/3</a>·callback·upon·reception·of
309 an·incoming·request.</p><p>In·cases·in·which·there·is·a·choice·between·string()·and·binary()·types·for309 an·incoming·request.</p><p>In·cases·in·which·there·is·a·choice·between·string()·and·binary()·types·for
310 OctetString()·and·derived·types,·the·representation·is·determined·by·the·value310 OctetString()·and·derived·types,·the·representation·is·determined·by·the·value
311 of·<a·href="diameter.html#service_opt">diameter:service_opt()</a>311 of·<a·href="diameter.html#service_opt">diameter:service_opt()</a>
312 <a·href="diameter.html#string_decode">string_decode</a>.</p><p><em>Basic·AVP·Data·Formats</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">OctetString</span><span·class="p"·data-group-id="4848656468-1">(</span><span·class="p"·data-group-id="4848656468-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="4848656468-2">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·223,·SHA:·3bf5baa633f76f5c58ac3ba457d86558c44cb110add438815716717192d74d57·...·]-3">)</span><span·class="w">312 <a·href="diameter.html#string_decode">string_decode</a>.</p><p><em>Basic·AVP·Data·Formats</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">OctetString</span><span·class="p"·data-group-id="2308941689-1">(</span><span·class="p"·data-group-id="2308941689-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="2308941689-2">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·223,·SHA:·40f950d4d7ad9d53d816bda2a566fcc06c0013339fbc663df6b49297c9035978·...·]-3">)</span><span·class="w">
313 </span><span·class="n">Integer32</span><span·class="p"·data-group-id="4848656468-4">(</span><span·class="p"·data-group-id="4848656468-4">)</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">2147483647</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">2147483647</span><span·class="w">313 </span><span·class="n">Integer32</span><span·class="p"·data-group-id="2308941689-4">(</span><span·class="p"·data-group-id="2308941689-4">)</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">2147483647</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">2147483647</span><span·class="w">
314 </span><span·class="n">Integer64</span><span·class="p"·data-group-id="4848656468-5">(</span><span·class="p"·data-group-id="4848656468-5">)</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">9223372036854775807</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">9223372036854775807</span><span·class="w">314 </span><span·class="n">Integer64</span><span·class="p"·data-group-id="2308941689-5">(</span><span·class="p"·data-group-id="2308941689-5">)</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">9223372036854775807</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">9223372036854775807</span><span·class="w">
315 </span><span·class="n">Unsigned32</span><span·class="p"·data-group-id="4848656468-6">(</span><span·class="p"·data-group-id="4848656468-6">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">4294967295</span><span·class="w">315 </span><span·class="n">Unsigned32</span><span·class="p"·data-group-id="2308941689-6">(</span><span·class="p"·data-group-id="2308941689-6">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">4294967295</span><span·class="w">
316 </span><span·class="n">Unsigned64</span><span·class="p"·data-group-id="4848656468-7">(</span><span·class="p"·data-group-id="4848656468-7">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">18446744073709551615</span><span·class="w">316 </span><span·class="n">Unsigned64</span><span·class="p"·data-group-id="2308941689-7">(</span><span·class="p"·data-group-id="2308941689-7">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">18446744073709551615</span><span·class="w">
317 </span><span·class="n">Float32</span><span·class="p"·data-group-id="4848656468-8">(</span><span·class="p"·data-group-id="4848656468-8">)</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;-infinity&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w[·...·truncated·by·diffoscope;·len:·133,·SHA:·0d19fcffecef4320b19012097005ddcf3ae080b3587ac6d8976087827e4c10d5·...·]-9">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="w">317 </span><span·class="n">Float32</span><span·class="p"·data-group-id="2308941689-8">(</span><span·class="p"·data-group-id="2308941689-8">)</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;-infinity&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w[·...·truncated·by·diffoscope;·len:·133,·SHA:·f8995050b84acac93079e54e4319a2f87d5e59745a75f6abaead4bf82a19e20b·...·]-9">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="w">
318 </span><span·class="n">Float64</span><span·class="p"·data-group-id="4848656468-10">(</span><span·class="p"·data-group-id="4848656468-10">)</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;-infinity&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class=[·...·truncated·by·diffoscope;·len:·136,·SHA:·5597a2983af5b2170830ff5a036c05d6da7b6512c8254df55906e25453ffa25a·...·]-11">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="w">318 </span><span·class="n">Float64</span><span·class="p"·data-group-id="2308941689-10">(</span><span·class="p"·data-group-id="2308941689-10">)</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;-infinity&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class=[·...·truncated·by·diffoscope;·len:·136,·SHA:·4a2dc61f4189d9d4d5dd8bd6f7c45aa33f5c6138ccfc26073d444d151b8bc012·...·]-11">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="w">
319 </span><span·class="n">Grouped</span><span·class="p"·data-group-id="4848656468-12">(</span><span·class="p"·data-group-id="4848656468-12">)</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record</span><span·class="p"·data-group-id="4848656468-13">(</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·5028e624d42ff781827deda68fcdbba45de853b368a7830cb931a36ca36dbd2b·...·]-13">)</span></code></pre><p>On·encode,·an·OctetString()·can·be·specified·as·an·iolist(),·excessively·large319 </span><span·class="n">Grouped</span><span·class="p"·data-group-id="2308941689-12">(</span><span·class="p"·data-group-id="2308941689-12">)</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record</span><span·class="p"·data-group-id="2308941689-13">(</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·514e22262ccd79eb9ecf8a53ec2c768a9aa7c994a199f1780d479543de880f33·...·]-13">)</span></code></pre><p>On·encode,·an·OctetString()·can·be·specified·as·an·iolist(),·excessively·large
320 floats·(in·absolute·value)·are·equivalent·to·<code·class="inline">infinity</code>·or·<code·class="inline">'-infinity'</code>·and320 floats·(in·absolute·value)·are·equivalent·to·<code·class="inline">infinity</code>·or·<code·class="inline">'-infinity'</code>·and
321 excessively·large·integers·result·in·encode·failure.·The·records·for·grouped321 excessively·large·integers·result·in·encode·failure.·The·records·for·grouped
322 AVPs·are·as·discussed·in·the·previous·section.</p><p><em>Derived·AVP·Data·Formats</em></p><p><a·href=""·id="Address"></a></p><pre><code·class="text">Address()·=·OctetString()322 AVPs·are·as·discussed·in·the·previous·section.</p><p><em>Derived·AVP·Data·Formats</em></p><p><a·href=""·id="Address"></a></p><pre><code·class="text">Address()·=·OctetString()
323 ··········|·tuple()</code></pre><p>On·encode,·an·OctetString()·IPv4·address·is·parsed·in·the·usual·x.x.x.x·format323 ··········|·tuple()</code></pre><p>On·encode,·an·OctetString()·IPv4·address·is·parsed·in·the·usual·x.x.x.x·format
324 while·an·IPv6·address·is·parsed·in·any·of·the·formats·specified·by·section·2.2324 while·an·IPv6·address·is·parsed·in·any·of·the·formats·specified·by·section·2.2
325 of·RFC·2373,·&quot;Text·Representation·of·Addresses&quot;.·An·IPv4·tuple()·has·length·4325 of·RFC·2373,·&quot;Text·Representation·of·Addresses&quot;.·An·IPv4·tuple()·has·length·4
326 and·contains·values·of·type·0..255.·An·IPv6·tuple()·has·length·8·and·contains326 and·contains·values·of·type·0..255.·An·IPv6·tuple()·has·length·8·and·contains
327 values·of·type·0..65535.·The·tuple·representation·is·used·on·decode.</p><p><a·href=""·id="Time"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Time</span><span·class="p"·data-group-id="2100513846-1">(</span><span·class="p"·data-group-id="2100513846-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2100513846-2">{</span><span·class="nf">date</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·301,·SHA:·b24d00736c54091cda2833a70568dc6504d482c0321819768b4eab643ad045cd·...·]-2">}</span><span·class="w">327 values·of·type·0..65535.·The·tuple·representation·is·used·on·decode.</p><p><a·href=""·id="Time"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Time</span><span·class="p"·data-group-id="3814872850-1">(</span><span·class="p"·data-group-id="3814872850-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3814872850-2">{</span><span·class="nf">date</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·301,·SHA:·81fa35184935953e6603e90f6cd44e400966e8a1084224bdf6f8d5042d417cd9·...·]-2">}</span><span·class="w">
  
328 </span><span·class="ss">where</span><span·class="w">328 </span><span·class="ss">where</span><span·class="w">
  
329 ··</span><span·class="nf">date</span><span·class="p"·data-group-id="2100513846-5">(</span><span·class="p"·data-group-id="2100513846-5">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2100513846-6">{</span><span·class="n">Year</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·162,·SHA:·1ac9aace1384f3e8c37de389d61bfcbeec8004e439ab1c1d92beebac98c7be66·...·]-6">}</span><span·class="w">329 ··</span><span·class="nf">date</span><span·class="p"·data-group-id="3814872850-5">(</span><span·class="p"·data-group-id="3814872850-5">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3814872850-6">{</span><span·class="n">Year</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·162,·SHA:·b9b38b9eb8a337a52486b15aa671f598a12e39083d1ac5d09ae171d8164a6a35·...·]-6">}</span><span·class="w">
330 ··</span><span·class="nf">time</span><span·class="p"·data-group-id="2100513846-7">(</span><span·class="p"·data-group-id="2100513846-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2100513846-8">{</span><span·class="n">Hour</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·166,·SHA:·58628ef2d68510cc8abbe5bb9e039b78e493aee70cf686b33791648953167edf·...·]-8">}</span><span·class="w">330 ··</span><span·class="nf">time</span><span·class="p"·data-group-id="3814872850-7">(</span><span·class="p"·data-group-id="3814872850-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3814872850-8">{</span><span·class="n">Hour</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·166,·SHA:·b5517fe1231b5fcc7bdee725887d71b9ab2ca835de55eef61b05c366079f7676·...·]-8">}</span><span·class="w">
  
331 ··</span><span·class="n">Year</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="2100513846-9">(</span><span·class="p"·data-group-id="2100513846-9">)</span><span·class="w">331 ··</span><span·class="n">Year</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3814872850-9">(</span><span·class="p"·data-group-id="3814872850-9">)</span><span·class="w">
332 ··</span><span·class="n">Month</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">12</span><span·class="w">332 ··</span><span·class="n">Month</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">12</span><span·class="w">
333 ··</span><span·class="n">Day</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">31</span><span·class="w">333 ··</span><span·class="n">Day</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">31</span><span·class="w">
334 ··</span><span·class="n">Hour</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">23</span><span·class="w">334 ··</span><span·class="n">Hour</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">23</span><span·class="w">
335 ··</span><span·class="n">Minute</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">59</span><span·class="w">335 ··</span><span·class="n">Minute</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">59</span><span·class="w">
336 ··</span><span·class="n">Second</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">59</span></code></pre><p>Additionally,·values·that·can·be·encoded·are·limited·by·way·of·their·encoding·as336 ··</span><span·class="n">Second</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span><span·class="mi">59</span></code></pre><p>Additionally,·values·that·can·be·encoded·are·limited·by·way·of·their·encoding·as
337 four·octets·as·required·by·RFC·6733·with·the·required·extension·from·RFC·2030.337 four·octets·as·required·by·RFC·6733·with·the·required·extension·from·RFC·2030.
338 In·particular,·only·values·between·<code·class="inline">{{1968,1,20},{3,14,8}}</code>·and338 In·particular,·only·values·between·<code·class="inline">{{1968,1,20},{3,14,8}}</code>·and
Offset 355, 16 lines modifiedOffset 355, 16 lines modified
355 ··FQDN·=·OctetString()355 ··FQDN·=·OctetString()
356 ··Port·=·integer()356 ··Port·=·integer()
357 ··Transport·=·sctp·|·tcp357 ··Transport·=·sctp·|·tcp
358 ··Protocol··=·diameter·|·radius·|·'tacacs+'</code></pre><p>On·encode,·fields·port,·transport·and·protocol·default·to·3868,·sctp·and358 ··Protocol··=·diameter·|·radius·|·'tacacs+'</code></pre><p>On·encode,·fields·port,·transport·and·protocol·default·to·3868,·sctp·and
359 diameter·respectively.·The·grammar·of·an·OctetString-valued·DiameterURI()·is·as359 diameter·respectively.·The·grammar·of·an·OctetString-valued·DiameterURI()·is·as
360 specified·in·section·4.3·of·RFC·6733.·The·record·representation·is·used·on360 specified·in·section·4.3·of·RFC·6733.·The·record·representation·is·used·on
361 decode.</p><p><a·href=""·id="Enumerated"></a></p><pre><code·class="text">Enumerated()·=·Integer32()</code></pre><p>On·encode,·values·can·be·specified·using·the·macros·defined·in·a·dictionary's361 decode.</p><p><a·href=""·id="Enumerated"></a></p><pre><code·class="text">Enumerated()·=·Integer32()</code></pre><p>On·encode,·values·can·be·specified·using·the·macros·defined·in·a·dictionary's
362 hrl·file.</p><p><a·href=""·id="IPFilterRule"></a>·<a·href=""·id="QoSFilterRule"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">IPFilterRule</span><span·class="p"·data-group-id="7568491518-1">(</span><span·class="p"·data-group-id="7568491518-1">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OctetString</span><span·class="p"·data-group-id="7568491518-2">(</span><span·class="p"·data-group-id="7568491518-2">)</span><span·class="w"> 
363 </span><span·class="n">QoSFilterRule</span><span·class="p"·data-group-id="7568491518-3">(</span><span·class="p"·data-group-id="7568491518-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OctetString</span><[·...·truncated·by·diffoscope;·len:·224,·SHA:·d015307905f2b127bcc47bda849d3ee5daecfd1bc8f3261aae2ecb0f82f8fce4·...·]">362 hrl·file.</p><p><a·href=""·id="IPFilterRule"></a>·<a·href=""·id="QoSFilterRule"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">IPFilterRule</span><span·class="p"·data-group-id="9641249656-1">(</span><span·class="p"·data-group-id="9[·...·truncated·by·diffoscope;·len:·248,·SHA:·3e5fbf72eb3522ba6b784206d91956ee174db0d7f64be1af6840d5cf88f97935·...·]">
 363 </span><span·class="n">QoSFilterRule</span><span·class="p"·data-group-id="9641249656-3">(</span><span·class="p"·data-group-id="9641249656-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OctetString</span><span·class="p"·data-group-id="9641249656-4">(</span><span·class="p"·data-group-id="9641249656-4">)</span></code></pre><p>Values·of·these·types·are·not·currently·parsed·by·diameter.</p><h2·id="see-also"·class="section-heading">
364 ··<a·href="#see-also"·class="hover-link">364 ··<a·href="#see-also"·class="hover-link">
365 ····<i·class="ri-link-m"·aria-hidden="true"></i>365 ····<i·class="ri-link-m"·aria-hidden="true"></i>
366 ··</a>366 ··</a>
367 ··<span·class="text">SEE·ALSO</span>367 ··<span·class="text">SEE·ALSO</span>
368 </h2>368 </h2>
369 <p><a·href="diameterc_cmd.html">diameterc(1)</a>,·<a·href="diameter.html"><code·class="inline">diameter</code></a>,·<a·href="diameter_app.html"><code·class="inline">diameter_app</code></a>,369 <p><a·href="diameterc_cmd.html">diameterc(1)</a>,·<a·href="diameter.html"><code·class="inline">diameter</code></a>,·<a·href="diameter_app.html"><code·class="inline">diameter_app</code></a>,
370 <a·href="diameter_codec.html"><code·class="inline">diameter_codec</code></a>,·<a·href="diameter_make.html"><code·class="inline">diameter_make</code></a></p>370 <a·href="diameter_codec.html"><code·class="inline">diameter_codec</code></a>,·<a·href="diameter_make.html"><code·class="inline">diameter_make</code></a></p>
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405 ······<p·class="built-using">405 ······<p·class="built-using">
406 ········Built·using406 ········Built·using
407 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the407 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
408 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>408 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
409 ······</p>409 ······</p>
410 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>410 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
411 ····</footer>411 ····</footer>
412 ··</div>412 ··</div>
413 </main>413 </main>
414 </div>414 </div>
415 <script>415 <script>
416 ··function·mermaidLoaded()·{416 ··function·mermaidLoaded()·{
417 ····mermaid.initialize({417 ····mermaid.initialize({
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173 ········Built·using173 ········Built·using
174 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the174 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
175 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>175 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
176 ······</p>176 ······</p>
177 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>177 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
178 ····</footer>178 ····</footer>
179 ··</div>179 ··</div>
180 </main>180 </main>
181 </div>181 </div>
182 <script>182 <script>
183 ··function·mermaidLoaded()·{183 ··function·mermaidLoaded()·{
184 ····mermaid.initialize({184 ····mermaid.initialize({
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201 ········Built·using201 ········Built·using
202 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the202 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
203 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>203 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
204 ······</p>204 ······</p>
205 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>205 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
206 ····</footer>206 ····</footer>
207 ··</div>207 ··</div>
208 </main>208 </main>
209 </div>209 </div>
210 <script>210 <script>
211 ··function·mermaidLoaded()·{211 ··function·mermaidLoaded()·{
212 ····mermaid.initialize({212 ····mermaid.initialize({
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519 ······<p·class="built-using">519 ······<p·class="built-using">
520 ········Built·using520 ········Built·using
521 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the521 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
522 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>522 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
523 ······</p>523 ······</p>
524 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>524 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
525 ····</footer>525 ····</footer>
526 ··</div>526 ··</div>
527 </main>527 </main>
528 </div>528 </div>
529 <script>529 <script>
530 ··function·mermaidLoaded()·{530 ··function·mermaidLoaded()·{
531 ····mermaid.initialize({531 ····mermaid.initialize({
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438 ········Built·using438 ········Built·using
439 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the439 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
440 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>440 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
441 ······</p>441 ······</p>
442 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>442 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
443 ····</footer>443 ····</footer>
444 ··</div>444 ··</div>
445 </main>445 </main>
446 </div>446 </div>
447 <script>447 <script>
448 ··function·mermaidLoaded()·{448 ··function·mermaidLoaded()·{
449 ····mermaid.initialize({449 ····mermaid.initialize({
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215 ········Built·using215 ········Built·using
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217 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>217 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
218 ······</p>218 ······</p>
219 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>219 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
220 ····</footer>220 ····</footer>
221 ··</div>221 ··</div>
222 </main>222 </main>
223 </div>223 </div>
224 <script>224 <script>
225 ··function·mermaidLoaded()·{225 ··function·mermaidLoaded()·{
226 ····mermaid.initialize({226 ····mermaid.initialize({
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128 <p>Doclet·converting·an·edoc·application·to·use·<a·href="https://www.erlang.org/eeps/eep-0059">EEP-59</a>·and·Markdown.</p><p>This·doclet·has·to·be·used·together·with·<a·href="edoc_layout_chunks.html"><code>edoc_layout_chunks</code></a>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">edoc</span><span·class="p">:</span><span·class="nf">application</span><span·class="p"·data-group-id="9238454023-1">(</span><span·class="ss">example</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9238454023-2">[</span><span·class="p"·data-group-id="9238454023-3">{</span><span·class="ss">preprocess</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="9238454023-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9238454023-4">{</span><span·class="ss">doclet</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">edoc_doclet_markdown</span><span·class="p"·data-group-id="9238454023-4">}</span><span·class="p">,</span><span·class="w"> 
129 ·······</span><span·class="p"·data-group-id="9238454023-5">{</span><span·class="ss">layout</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">edoc_layout_chunks</span><span·class="p"·data-group-id="9238454023-5">}</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·603,·SHA:·d715f91947c639e3c265478b0b12d30ce4c04919fd60624cfd02392b1f017e0c·...·]>128 <p>Doclet·converting·an·edoc·application·to·use·<a·href="https://www.erlang.org/eeps/eep-0059">EEP-59</a>·and·Markdown.</p><p>This·doclet·has·to·be·used·together·with·<a·href="edoc_layout_chunks.html"><code>edoc_layout_chunks</code></a>.</p><p>Example:</p>[·...·truncated·by·diffoscope;·len:·951,·SHA:·732f1eb0f524d34ef75fac475797c6bc178281860142b05341a9e1f4ed7e007d·...·]>
 129 ·······</span><span·class="p"·data-group-id="5988936668-5">{</span><span·class="ss">layout</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">edoc_layout_chunks</span><span·class="p"·data-group-id="5988936668-5">}</span><span·class="p"·data-group-id="5988936668-2">]</span><span·class="p"·data-group-id="5988936668-1">)</span><span·class="p">.</span></code></pre><p>It·will·convert·the·overview·to·Markdown·and·any·module·documentation·to·use·<code>-doc</code>·attributes·and·Markdown.·Any·XHTML·tags·in·the·edoc·documentation·that·are·not·part·of·the·tags·supported·by·<a·href="doc_storage.html#erlang-documentation-format">Erlang·Documentation·Format</a>·will·be·added·as·HTML·tags·in·the·Markdown.</p><p>It·does·not·delete·the·old·edoc·documentation.</p><p><em>See·also:·</em><a·href="edoc_layout_chunks.html">edoc_layout_chunks</a>.</p>
130 ····</section>130 ····</section>
  
131 </div>131 </div>
  
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181 ······<p·class="built-using">181 ······<p·class="built-using">
182 ········Built·using182 ········Built·using
183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the183 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>184 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
185 ······</p>185 ······</p>
186 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>186 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
190 </div>190 </div>
191 <script>191 <script>
192 ··function·mermaidLoaded()·{192 ··function·mermaidLoaded()·{
193 ····mermaid.initialize({193 ····mermaid.initialize({
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Offset 951, 21 lines modifiedOffset 951, 21 lines modified
951 ·················Dn·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),951 ·················Dn·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
952 ·················Attributes·::·[<a·href="#t:attribute/0">attribute</a>()],952 ·················Attributes·::·[<a·href="#t:attribute/0">attribute</a>()],
953 ·················Refs·::·{referral,·<a·href="#t:referrals/0">referrals</a>()},953 ·················Refs·::·{referral,·<a·href="#t:referrals/0">referrals</a>()},
954 ·················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>954 ·················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
955 ······</div>955 ······</div>
  
956 <p>Add·an·entry.·The·entry·must·not·exist.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nf">add</span><span·class="p"·data-group-id="3643671037-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">956 <p>Add·an·entry.·The·entry·must·not·exist.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nf">add</span><span·class="p"·data-group-id="1730567229-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">
957 ······</span><span·class="s">&quot;cn=Bill·Valentine,·ou=people,·o=Example·Org,·dc=example,·dc=com&quot;</span><span·class="p">,</span><span·class="w">957 ······</span><span·class="s">&quot;cn=Bill·Valentine,·ou=people,·o=Example·Org,·dc=example,·dc=com&quot;</span><span·class="p">,</span><span·class="w">
958 ·······</span><span·class="p"·data-group-id="3643671037-2">[</span><span·class="p"·data-group-id="3643671037-3">{</span><span·class="s">&quot;objectclass&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3643671037-4">[</span><span·class="s">&quot;person&quot;[·...·truncated·by·diffoscope;·len:·101,·SHA:·a64d7dfc225ba2d8018b9758f1f38954ddc0c44b811a43362d4409bb9813ca97·...·]-3">}</span><span·class="p">,</span><span·class="w">958 ·······</span><span·class="p"·data-group-id="1730567229-2">[</span><span·class="p"·data-group-id="1730567229-3">{</span><span·class="s">&quot;objectclass&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730567229-4">[</span><span·class="s">&quot;person&quot;[·...·truncated·by·diffoscope;·len:·101,·SHA:·ffa4604d4076fb0766ff394352821acb0445928a6f286f972f3316a27c352173·...·]-3">}</span><span·class="p">,</span><span·class="w">
959 ········</span><span·class="p"·data-group-id="3643671037-5">{</span><span·class="s">&quot;cn&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3643671037-6">[</span><span·class="s">&quot;Bill·Valentine&quot;</span><span·class="p"·data-group-id="3643671037-6">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·51954116391f0c26d7ceb915bcf9e3910e81eb98a5fd4fde37fce59c8a6e0c56·...·]-5">}</span><span·class="p">,</span><span·class="w">959 ········</span><span·class="p"·data-group-id="1730567229-5">{</span><span·class="s">&quot;cn&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730567229-6">[</span><span·class="s">&quot;Bill·Valentine&quot;</span><span·class="p"·data-group-id="1730567229-6">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·e09ea8b414b4c31e9bd162458d921b779d8fc5a8c7ce7f27ab66e597117c6257·...·]-5">}</span><span·class="p">,</span><span·class="w">
960 ········</span><span·class="p"·data-group-id="3643671037-7">{</span><span·class="s">&quot;sn&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3643671037-8">[</span><span·class="s">&quot;Valentine&quot;</span><span·class="p"·data-group-id="3643671037-8">]</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·f08f96509c2c6522732f8396869ba8bea0b999d3bf42cff00264e57e7f0e7d24·...·]-7">}</span><span·class="p">,</span><span·class="w">960 ········</span><span·class="p"·data-group-id="1730567229-7">{</span><span·class="s">&quot;sn&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730567229-8">[</span><span·class="s">&quot;Valentine&quot;</span><span·class="p"·data-group-id="1730567229-8">]</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·e86123cec2f4e3082580b9e6b2b90ff1d0d0c171a6f5ce3d59e8c91e7e026864·...·]-7">}</span><span·class="p">,</span><span·class="w">
961 ········</span><span·class="p"·data-group-id="3643671037-9">{</span><span·class="s">&quot;telephoneNumber&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3643671037-10">[</span><span·class="s">&quot;545·555·00&quot;</span><span·class="p"·data-group-id="364367[·...·truncated·by·diffoscope;·len:·111,·SHA:·d6381ef3dda7381ae98054f87c0738bbd037b2fef543304ff405d86cfb18cb97·...·]-2">]</span><span·class="w">961 ········</span><span·class="p"·data-group-id="1730567229-9">{</span><span·class="s">&quot;telephoneNumber&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1730567229-10">[</span><span·class="s">&quot;545·555·00&quot;</span><span·class="p"·data-group-id="173056[·...·truncated·by·diffoscope;·len:·111,·SHA:·fef59b6ce3e305054bdb34e646f3d013b024fbfc00805679b79d84ec2ab41404·...·]-2">]</span><span·class="w">
962 ·····</span><span·class="p"·data-group-id="3643671037-1">)</span></code></pre>962 ·····</span><span·class="p"·data-group-id="1730567229-1">)</span></code></pre>
963 ··</section>963 ··</section>
964 </section>964 </section>
965 <section·class="detail"·id="and/1">965 <section·class="detail"·id="and/1">
  
966 ··<div·class="detail-header">966 ··<div·class="detail-header">
967 ····<a·href="#and/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">967 ····<a·href="#and/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
968 ······<i·class="ri-link-m"·aria-hidden="true"></i>968 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1249, 15 lines modifiedOffset 1249, 15 lines modified
1249 ·····························OptionalAttrs·::1249 ·····························OptionalAttrs·::
1250 ·································[{matchingRule,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()}·|1250 ·································[{matchingRule,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()}·|
1251 ··································{type,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()}·|1251 ··································{type,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()}·|
1252 ··································{dnAttributes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()}].</pre>1252 ··································{dnAttributes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()}].</pre>
  
1253 ······</div>1253 ······</div>
  
1254 <p>Creates·an·extensible·match·filter.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">extensibleMatch</span><span·class="p"·data-group-id="8898182649-1">(</span><span·class="s">&quot;Bar&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8898182649-2">[</span><span·class="p"·data-group-id="8898182649-3">{</span><span·class="ss">type</span><span·class="p[·...·truncated·by·diffoscope;·len:·457,·SHA:·09786855fa33f4a86c78803d039da103716567234f44185dfc763d61000672be·...·]-1">)</span><span·class="p">)</span></code></pre><p>creates·a·filter·which·performs·a·<code·class="inline">caseExactMatch</code>·on·the·attribute·<code·class="inline">sn</code>·and1254 <p>Creates·an·extensible·match·filter.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">extensibleMatch</span><span·class="p"·data-group-id="5315256995-1">(</span><span·class="s">&quot;Bar&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5315256995-2">[</span><span·class="p"·data-group-id="5315256995-3">{</span><span·class="ss">type</span><span·class="p[·...·truncated·by·diffoscope;·len:·457,·SHA:·5d286e68ed14b0c0061bed4ea6da7806c00c8c73ee81512c1607f1ee772b65c3·...·]-1">)</span><span·class="p">)</span></code></pre><p>creates·a·filter·which·performs·a·<code·class="inline">caseExactMatch</code>·on·the·attribute·<code·class="inline">sn</code>·and
1255 matches·with·the·value·<code·class="inline">&quot;Bar&quot;</code>.·The·default·value·of·<code·class="inline">dnAttributes</code>·is·<code·class="inline">false</code>.</p>1255 matches·with·the·value·<code·class="inline">&quot;Bar&quot;</code>.·The·default·value·of·<code·class="inline">dnAttributes</code>·is·<code·class="inline">false</code>.</p>
1256 ··</section>1256 ··</section>
1257 </section>1257 </section>
1258 <section·class="detail"·id="greaterOrEqual/2">1258 <section·class="detail"·id="greaterOrEqual/2">
  
1259 ··<div·class="detail-header">1259 ··<div·class="detail-header">
1260 ····<a·href="#greaterOrEqual/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1260 ····<a·href="#greaterOrEqual/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1453, 17 lines modifiedOffset 1453, 17 lines modified
1453 ····················Dn·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),1453 ····················Dn·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
1454 ····················ModifyOps·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],1454 ····················ModifyOps·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],
1455 ····················Refs·::·{referral,·<a·href="#t:referrals/0">referrals</a>()},1455 ····················Refs·::·{referral,·<a·href="#t:referrals/0">referrals</a>()},
1456 ····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1456 ····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1457 ······</div>1457 ······</div>
  
1458 <p>Modify·an·entry.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nf">modify</span><span·class="p"·data-group-id="1157174073-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;cn=Bill·Valentine,·ou=people,·o=Example·Org,·dc=example,·dc=com&quot;</span><span·class="p">,</span><span·class="w">1458 <p>Modify·an·entry.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nf">modify</span><span·class="p"·data-group-id="3705349766-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;cn=Bill·Valentine,·ou=people,·o=Example·Org,·dc=example,·dc=com&quot;</span><span·class="p">,</span><span·class="w">
1459 ·········</span><span·class="p"·data-group-id="1157174073-2">[</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">mod_replace</span><span·class="p"·data-group-id="1157174073-3">(</span><span·class="s">&quot;telephoneNumber&quot;</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·197,·SHA:·29ce9a4f6f954778f4d6bc411e8848187c6cd14d42a8aa44d652ff592355cd5c·...·]-3">)</span><span·class="p">,</span><span·class="w">1459 ·········</span><span·class="p"·data-group-id="3705349766-2">[</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">mod_replace</span><span·class="p"·data-group-id="3705349766-3">(</span><span·class="s">&quot;telephoneNumber&quot;</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·197,·SHA:·1320f1521a2ba29f9fa765367f3c0ceead710fa3f28a764521ae275df159290b·...·]-3">)</span><span·class="p">,</span><span·class="w">
1460 »       ··</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">mod_add</span><span·class="p"·data-group-id="1157174073-5">(</span><span·class="s">&quot;description&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1157174073-6">[</span><span·class="s">&quot;LDAP·Hacker&quot;</span><span·class="p"·data-group-id="1157174073[·...·truncated·by·diffoscope;·len:·183,·SHA:·f37976ead3c98bf6c743b21b8849e9b01b736bb86666bbab71246cd358e53758·...·]-1">)</span></code></pre>1460 »       ··</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">mod_add</span><span·class="p"·data-group-id="3705349766-5">(</span><span·class="s">&quot;description&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3705349766-6">[</span><span·class="s">&quot;LDAP·Hacker&quot;</span><span·class="p"·data-group-id="3705349766[·...·truncated·by·diffoscope;·len:·183,·SHA:·43e9c9eccf29ba95ab9d1d9db501b80c3ba8fe78a95a62a15600d876f7e31055·...·]-1">)</span></code></pre>
1461 ··</section>1461 ··</section>
1462 </section>1462 </section>
1463 <section·class="detail"·id="modify_dn/5">1463 <section·class="detail"·id="modify_dn/5">
  
1464 ··<div·class="detail-header">1464 ··<div·class="detail-header">
1465 ····<a·href="#modify_dn/5"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1465 ····<a·href="#modify_dn/5"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1466 ······<i·class="ri-link-m"·aria-hidden="true"></i>1466 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1757, 16 lines modifiedOffset 1757, 16 lines modified
  
1757 ··········<pre·translate="no"><span·class="attribute">-spec</span>·paged_result_control(PageSize)·->·{control,·ControlOID,·true,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}1757 ··········<pre·translate="no"><span·class="attribute">-spec</span>·paged_result_control(PageSize)·->·{control,·ControlOID,·true,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}
1758 ······························when·PageSize·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·ControlOID·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>().</pre>1758 ······························when·PageSize·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·ControlOID·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>().</pre>
  
1759 ······</div>1759 ······</div>
  
1760 <p>Paged·results·is·an·extension·to·the·LDAP·protocol·specified·by·RFC2696</p><p>This·function·creates·a·control·with·the·specified·page·size·for·use·in1760 <p>Paged·results·is·an·extension·to·the·LDAP·protocol·specified·by·RFC2696</p><p>This·function·creates·a·control·with·the·specified·page·size·for·use·in
1761 <code·class="inline">search/3</code>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Control</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">paged_result_control</span><span·class="p"·data-group-id="4549607882-1">(</span><span·class="mi">50</span><span·class="p"·data-group-id="4549607882-1">)</span><span·class="p">,</span><span·class="w">1761 <code·class="inline">search/3</code>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Control</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">paged_result_control</span><span·class="p"·data-group-id="4893676952-1">(</span><span·class="mi">50</span><span·class="p"·data-group-id="4893676952-1">)</span><span·class="p">,</span><span·class="w">
1762 </span><span·class="p"·data-group-id="4549607882-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SearchResults</span><span·class="p"·data-group-id="4549607882-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·725,·SHA:·47a8aa351ba6bb3f9a526bf0509b1cb66a82033e792147fceaa9ee8801bd914a·...·]2-3">)</span><span·class="p">,</span></code></pre>1762 </span><span·class="p"·data-group-id="4893676952-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SearchResults</span><span·class="p"·data-group-id="4893676952-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·725,·SHA:·480c5ab836964a531e5dcd4a660adb163d4bfe1b28fdc46e68992361669b72b4·...·]2-3">)</span><span·class="p">,</span></code></pre>
1763 ··</section>1763 ··</section>
1764 </section>1764 </section>
1765 <section·class="detail"·id="paged_result_control/2">1765 <section·class="detail"·id="paged_result_control/2">
  
1766 ··<div·class="detail-header">1766 ··<div·class="detail-header">
1767 ····<a·href="#paged_result_control/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1767 ····<a·href="#paged_result_control/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1768 ······<i·class="ri-link-m"·aria-hidden="true"></i>1768 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1789, 20 lines modifiedOffset 1789, 20 lines modified
1789 ··········<pre·translate="no"><span·class="attribute">-spec</span>·paged_result_control(PageSize,·Cookie)·->·{control,·ControlOID,·true,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}1789 ··········<pre·translate="no"><span·class="attribute">-spec</span>·paged_result_control(PageSize,·Cookie)·->·{control,·ControlOID,·true,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}
1790 ······························when·PageSize·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·Cookie·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),·ControlOID·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>().</pre>1790 ······························when·PageSize·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·Cookie·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),·ControlOID·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>().</pre>
  
1791 ······</div>1791 ······</div>
  
1792 <p>Paged·results·is·an·extension·to·the·LDAP·protocol·specified·by·RFC2696</p><p>This·function·creates·a·control·with·the·specified·page·size·and·cookie·for·use1792 <p>Paged·results·is·an·extension·to·the·LDAP·protocol·specified·by·RFC2696</p><p>This·function·creates·a·control·with·the·specified·page·size·and·cookie·for·use
1793 in·<code·class="inline">search/3</code>·to·retrieve·the·next·results·page.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">PageSize</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">50</span><span·class="p">,</span><span·class="w">1793 in·<code·class="inline">search/3</code>·to·retrieve·the·next·results·page.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">PageSize</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">50</span><span·class="p">,</span><span·class="w">
1794 </span><span·class="n">Control1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">paged_result_control</span><span·class="p"·data-group-id="6069068879-1">(</span><span·class="n">PageSize</span><span·class="p"·data-group-id="6069068879-1">)</span><span·class="p">,</span><span·class="w">1794 </span><span·class="n">Control1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">paged_result_control</span><span·class="p"·data-group-id="7588888722-1">(</span><span·class="n">PageSize</span><span·class="p"·data-group-id="7588888722-1">)</span><span·class="p">,</span><span·class="w">
1795 </span><span·class="p"·data-group-id="6069068879-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SearchResults1</span><span·class="p"·data-group-id="6069068879-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·729,·SHA:·99f5a5f08b002dfc3a6fb73303f0894e747ae0e7a47828803882eea631640c1b·...·]-3">)</span><span·class="p">,</span><span·class="w">1795 </span><span·class="p"·data-group-id="7588888722-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SearchResults1</span><span·class="p"·data-group-id="7588888722-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·729,·SHA:·15b21e250bc1d854f33f72bf4af9739063a1aedbcd95ba2215a222de772934d1·...·]-3">)</span><span·class="p">,</span><span·class="w">
1796 </span><span·class="c1">%%·retrieve·the·returned·cookie·from·the·search·results</span><span·class="w">1796 </span><span·class="c1">%%·retrieve·the·returned·cookie·from·the·search·results</span><span·class="w">
1797 </span><span·class="p"·data-group-id="6069068879-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cookie1</span><span·class="p"·data-group-id="6069068879-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·222,·SHA:·ab22f98cbe01d3a2ac88ed7868bfe2ac50a2ba87ba1c9a5098a86d2052fdbda8·...·]-8">)</span><span·class="p">,</span><span·class="w">1797 </span><span·class="p"·data-group-id="7588888722-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cookie1</span><span·class="p"·data-group-id="7588888722-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·222,·SHA:·22702df67e597b148c81b37aa93f303aa82ef5c0d8e799f8a7eb3baa922db27b·...·]-8">)</span><span·class="p">,</span><span·class="w">
1798 </span><span·class="n">Control2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">paged_result_control</span><span·class="p"·data-group-id="6069068879-9">(</span><span·class="n">PageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cookie1</span><span·class="p"·data-group-id="6069068879-9">)</span><span·class="p">,</span><span·class="w">1798 </span><span·class="n">Control2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">paged_result_control</span><span·class="p"·data-group-id="7588888722-9">(</span><span·class="n">PageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cookie1</span><span·class="p"·data-group-id="7588888722-9">)</span><span·class="p">,</span><span·class="w">
1799 </span><span·class="p"·data-group-id="6069068879-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SearchResults2</span><span·class="p"·data-group-id="6069068879-10">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·790,·SHA:·21988267772a9b9bc44878542877e4d06242767ee32a92a64d16958aeca7f8f6·...·]-11">)</span><span·class="p">,</span><span·class="w">1799 </span><span·class="p"·data-group-id="7588888722-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SearchResults2</span><span·class="p"·data-group-id="7588888722-10">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·790,·SHA:·c63e69ab48e3a21d018b044ff66cfda22afd0d952af40c2a5aa8db6d51e24a74·...·]-11">)</span><span·class="p">,</span><span·class="w">
1800 </span><span·class="c1">%%·etc</span></code></pre>1800 </span><span·class="c1">%%·etc</span></code></pre>
1801 ··</section>1801 ··</section>
1802 </section>1802 </section>
1803 <section·class="detail"·id="paged_result_cookie/1">1803 <section·class="detail"·id="paged_result_cookie/1">
  
1804 ··<div·class="detail-header">1804 ··<div·class="detail-header">
1805 ····<a·href="#paged_result_cookie/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1805 ····<a·href="#paged_result_cookie/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1908, 16 lines modifiedOffset 1908, 16 lines modified
1908 ····················Refs·::·{referral,·<a·href="#t:referrals/0">referrals</a>()},1908 ····················Refs·::·{referral,·<a·href="#t:referrals/0">referrals</a>()},
1909 ····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1909 ····················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1910 ······</div>1910 ······</div>
  
1911 <p>Search·the·directory·with·the·supplied·the·SearchOptions.</p><p>The·base·and·filter1911 <p>Search·the·directory·with·the·supplied·the·SearchOptions.</p><p>The·base·and·filter
1912 options·must·be·supplied.·Default·values:·scope·is·<a·href="#wholeSubtree/0"><code·class="inline">wholeSubtree/0</code></a>,·deref·is1912 options·must·be·supplied.·Default·values:·scope·is·<a·href="#wholeSubtree/0"><code·class="inline">wholeSubtree/0</code></a>,·deref·is
1913 <a·href="#derefAlways/0"><code·class="inline">derefAlways/0</code></a>,·types_only·is·<code·class="inline">false</code>·and·timeout·is·<code·class="inline">0</code>·(meaning·infinity).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="n">Filter</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">substrings</span><span·class="p"·data-group-id="7190000003-1">(</span><span·class="s">&quot;cn&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7190000003-2">[</span><span·class="p"·data-group-id="7190000003-3">{</span><span·class="ss">any</span><span·class="p">[·...·truncated·by·diffoscope;·len:·191,·SHA:·1a625413634586fcd6fe7ed5ee5ae9fb2ec689984a42212f21fe56fb29bea536·...·]-1">)</span><span·class="p">,</span><span·class="w">1913 <a·href="#derefAlways/0"><code·class="inline">derefAlways/0</code></a>,·types_only·is·<code·class="inline">false</code>·and·timeout·is·<code·class="inline">0</code>·(meaning·infinity).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="n">Filter</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">eldap</span><span·class="p">:</span><span·class="nf">substrings</span><span·class="p"·data-group-id="6278211291-1">(</span><span·class="s">&quot;cn&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6278211291-2">[</span><span·class="p"·data-group-id="6278211291-3">{</span><span·class="ss">any</span><span·class="p">[·...·truncated·by·diffoscope;·len:·191,·SHA:·8557c2c4db0328c1e65580bbc4d721ad94e5aac8677dcb9951369f385c4e24fb·...·]-1">)</span><span·class="p">,</span><span·class="w">
1914 ··</span><span·class="nf">search</span><span·class="p"·data-group-id="7190000003-4">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7190000003-5">[</span><span·class="p"·data-group-id="7190000003-6">{</span><span·class="ss">base</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·865,·SHA:·bb21028cdd793338c65a23271e4a93fb2210f628f143f282a1eb01718fb343db·...·]-4">)</span><span·class="p">,</span></code></pre><p>The·<code·class="inline">timeout</code>·option·in·the·<code·class="inline">SearchOptions</code>·is·for·the·ldap·server,·while·the1914 ··</span><span·class="nf">search</span><span·class="p"·data-group-id="6278211291-4">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6278211291-5">[</span><span·class="p"·data-group-id="6278211291-6">{</span><span·class="ss">base</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·865,·SHA:·cde2854bd504a4419a5d365417fc52e0d64e98e6938503148b00e95657767d0c·...·]-4">)</span><span·class="p">,</span></code></pre><p>The·<code·class="inline">timeout</code>·option·in·the·<code·class="inline">SearchOptions</code>·is·for·the·ldap·server,·while·the
1915 timeout·in·<a·href="#open/2">eldap:open/2</a>·is·used·for·each·individual·request·in·the1915 timeout·in·<a·href="#open/2">eldap:open/2</a>·is·used·for·each·individual·request·in·the
1916 search·operation.</p>1916 search·operation.</p>
1917 ··</section>1917 ··</section>
1918 </section>1918 </section>
1919 <section·class="detail"·id="simple_bind/3">1919 <section·class="detail"·id="simple_bind/3">
  
1920 ··<div·class="detail-header">1920 ··<div·class="detail-header">
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2137 ······<p·class="built-using">2137 ······<p·class="built-using">
2138 ········Built·using2138 ········Built·using
2139 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2139 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2140 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2140 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2141 ······</p>2141 ······</p>
2142 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2142 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2143 ····</footer>2143 ····</footer>
2144 ··</div>2144 ··</div>
2145 </main>2145 </main>
2146 </div>2146 </div>
2147 <script>2147 <script>
2148 ··function·mermaidLoaded()·{2148 ··function·mermaidLoaded()·{
2149 ····mermaid.initialize({2149 ····mermaid.initialize({
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515 ······</p>515 ······</p>
516 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>516 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
517 ····</footer>517 ····</footer>
518 ··</div>518 ··</div>
519 </main>519 </main>
520 </div>520 </div>
521 <script>521 <script>
522 ··function·mermaidLoaded()·{522 ··function·mermaidLoaded()·{
523 ····mermaid.initialize({523 ····mermaid.initialize({
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142 ········Built·using142 ········Built·using
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145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
153 ····mermaid.initialize({153 ····mermaid.initialize({
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134 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>134 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
135 ······</p>135 ······</p>
136 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>136 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
137 ····</footer>137 ····</footer>
138 ··</div>138 ··</div>
139 </main>139 </main>
140 </div>140 </div>
141 <script>141 <script>
142 ··function·mermaidLoaded()·{142 ··function·mermaidLoaded()·{
143 ····mermaid.initialize({143 ····mermaid.initialize({
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1026 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1026 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1027 ······</p>1027 ······</p>
1028 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1028 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1029 ····</footer>1029 ····</footer>
1030 ··</div>1030 ··</div>
1031 </main>1031 </main>
1032 </div>1032 </div>
1033 <script>1033 <script>
1034 ··function·mermaidLoaded()·{1034 ··function·mermaidLoaded()·{
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247 ·{&lt;madonna@chivas.du.etx.ericsson.se,17,0&gt;,247 ·{&lt;madonna@chivas.du.etx.ericsson.se,17,0&gt;,
248 ··················{registered_name,code_server}},248 ··················{registered_name,code_server}},
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252 ··················[]}]</code></pre><p>To·forward·standard·output·without·printing·the·result·term·(<em>again,·the·input252 ··················[]}]</code></pre><p>To·forward·standard·output·without·printing·the·result·term·(<em>again,·the·input
253 ends·with·EOF·(Control-D)</em>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">erl_call</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">s</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">e</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">sname</span><span·class="w">·</span><span·class="ss">madonna</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">fetch_stdout</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">no_result_term</span><span·class="w">253 ends·with·EOF·(Control-D)</em>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">erl_call</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">s</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">e</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">sname</span><span·class="w">·</span><span·class="ss">madonna</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">fetch_stdout</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">no_result_term</span><span·class="w">
254 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1706931052-1">(</span><span·class="s">&quot;Number·of·schedulers:·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1706931052-2">[</span><[·...·truncated·by·diffoscope;·len:·322,·SHA:·8794cb1035dfaec26154092f211d99ec9630d7a74cb2c82889c8fbc9a3654241·...·]-1">)</span><span·class="p">,</span><span·class="w">254 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4124302768-1">(</span><span·class="s">&quot;Number·of·schedulers:·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4124302768-2">[</span><[·...·truncated·by·diffoscope;·len:·322,·SHA:·6ce46f2b16c0ac444271f3ab54916886295d32024f4983ac1ba2c46b2f7cf62b·...·]-1">)</span><span·class="p">,</span><span·class="w">
255 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1706931052-4">(</span><span·class="s">&quot;Number·of·logical·cores:·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1706931052-5">[</spa[·...·truncated·by·diffoscope;·len:·343,·SHA:·abfd81ff902f094e8e70297ed4cd14ee95496ec26d9c6688c4ffaaa9abd3d481·...·]-4">)</span><span·class="p">.</span><span·class="w">255 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4124302768-4">(</span><span·class="s">&quot;Number·of·logical·cores:·</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4124302768-5">[</spa[·...·truncated·by·diffoscope;·len:·343,·SHA:·56b86f3f53978a26e2da312979262c5c275b600aaddd19cb19e6146f6f73cd00·...·]-4">)</span><span·class="p">.</span><span·class="w">
256 </span><span·class="err">^</span><span·class="n">D</span><span·class="w">256 </span><span·class="err">^</span><span·class="n">D</span><span·class="w">
257 </span><span·class="n">Number</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="nc">schedulers</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">8</span><span·class="w">257 </span><span·class="n">Number</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="nc">schedulers</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">8</span><span·class="w">
258 </span><span·class="n">Number</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">logical</span><span·class="w">·</span><span·class="nc">cores</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">8</span></code></pre>258 </span><span·class="n">Number</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">logical</span><span·class="w">·</span><span·class="nc">cores</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">8</span></code></pre>
259 </div>259 </div>
  
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134 <p>The·two·major·components·of·the·<code·class="inline">Event·Tracer·(ET)</code>·tool·is·a·graphical·sequence134 <p>The·two·major·components·of·the·<code·class="inline">Event·Tracer·(ET)</code>·tool·is·a·graphical·sequence
135 chart·viewer·(<code·class="inline">et_viewer</code>)·and·its·backing·storage·(<code·class="inline">et_collector</code>).·One135 chart·viewer·(<code·class="inline">et_viewer</code>)·and·its·backing·storage·(<code·class="inline">et_collector</code>).·One
136 <code·class="inline">Collector</code>·may·be·used·as·backing·storage·for·several·simultaneous·<code·class="inline">Viewers</code>136 <code·class="inline">Collector</code>·may·be·used·as·backing·storage·for·several·simultaneous·<code·class="inline">Viewers</code>
137 where·each·one·may·display·a·different·view·of·the·same·trace·data.</p><p>The·interface·between·the·<code·class="inline">Collector</code>·and·its·<code·class="inline">Viewers</code>·is·public·in·order·to137 where·each·one·may·display·a·different·view·of·the·same·trace·data.</p><p>The·interface·between·the·<code·class="inline">Collector</code>·and·its·<code·class="inline">Viewers</code>·is·public·in·order·to
138 enable·other·types·of·<code·class="inline">Viewers</code>.·However·in·the·following·text·we·will·focus·on138 enable·other·types·of·<code·class="inline">Viewers</code>.·However·in·the·following·text·we·will·focus·on
139 usage·of·the·<code·class="inline">et_viewer</code>.</p><p>The·main·start·function·is·<a·href="et_viewer.html#start/1"><code·class="inline">et_viewer:start/1</code></a>.·By·default·it·will·start·both·an139 usage·of·the·<code·class="inline">et_viewer</code>.</p><p>The·main·start·function·is·<a·href="et_viewer.html#start/1"><code·class="inline">et_viewer:start/1</code></a>.·By·default·it·will·start·both·an
140 <code·class="inline">et_collector</code>·and·an·<code·class="inline">et_viewer</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-pa·et/examples</span><span·class="w">140 <code·class="inline">et_collector</code>·and·an·<code·class="inline">et_viewer</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-pa·et/examples</span><span·class="w">
141 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R13B03</span><span·class="w">·</span><span·class="p"·data-group-id="5717838800-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.7</span><span·class="p">.</span><span·class="mi">4</span><span·class="p"·data-group-id="5717838800-1">)</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1130,·SHA:·6736d1a313016560434bfce29ad4921d26e71457ba93c3d3e068dc8be707b24f·...·]-6">]</span><span·class="w">141 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R13B03</span><span·class="w">·</span><span·class="p"·data-group-id="0309921801-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.7</span><span·class="p">.</span><span·class="mi">4</span><span·class="p"·data-group-id="0309921801-1">)</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1130,·SHA:·2f71ba2900ac7c91676f313859cd9942a6a734d827a0293c6019c50518e1abda·...·]-6">]</span><span·class="w">
  
142 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">7.4</span><span·class="w">··</span><span·class="p"·data-group-id="5717838800-7">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="5717838800-7">)</span><span·class="gp·unselectable">142 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">7.4</span><span·class="w">··</span><span·class="p"·data-group-id="0309921801-7">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0309921801-7">)</span><span·class="gp·unselectable">
143 1&gt;·</span><span·class="p"·data-group-id="5717838800-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="5717838800-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·282,·SHA:·2ca146447b42e3a282bbdf0781a17175d3310c17248ff85728c31756d25430f8·...·]-9">)</span><span·class="p">.</span><span·class="w">143 1&gt;·</span><span·class="p"·data-group-id="0309921801-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="0309921801-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·282,·SHA:·2d285dbf8aec8aa644e56d3ad3027f51cd97472430188a32c9e862a97846c34b·...·]-9">)</span><span·class="p">.</span><span·class="w">
144 </span><span·class="p"·data-group-id="5717838800-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="5717838800-11">}</span></code></pre><p>A·<code·class="inline">Viewer</code>·gets·trace·<code·class="inline">Events</code>·from·its·<code·class="inline">Collector</code>·by·polling·it·regularly·for144 </span><span·class="p"·data-group-id="0309921801-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0309921801-11">}</span></code></pre><p>A·<code·class="inline">Viewer</code>·gets·trace·<code·class="inline">Events</code>·from·its·<code·class="inline">Collector</code>·by·polling·it·regularly·for
145 more·<code·class="inline">Events</code>·to·display.·<code·class="inline">Events</code>·are·for·example·reported·to·the·<code·class="inline">Collector</code>145 more·<code·class="inline">Events</code>·to·display.·<code·class="inline">Events</code>·are·for·example·reported·to·the·<code·class="inline">Collector</code>
146 with·<a·href="et_collector.html#report_event/6"><code·class="inline">et_collector:report_event/6</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">Collector</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="9751452480-1">(</span><span·class="n">Viewer</span><span·class="p"·data-group-id="9751452480-1">)</span><span·class="p">.</span><span·class="w">146 with·<a·href="et_collector.html#report_event/6"><code·class="inline">et_collector:report_event/6</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">Collector</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="1198653325-1">(</span><span·class="n">Viewer</span><span·class="p"·data-group-id="1198653325-1">)</span><span·class="p">.</span><span·class="w">
147 </span><span·class="o">&lt;</span><span·class="mf">0.39</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">147 </span><span·class="o">&lt;</span><span·class="mf">0.39</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
148 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-2">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_outer</span><span·class="p">,</span><span·class="gp·unselectable">148 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-2">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_outer</span><span·class="p">,</span><span·class="gp·unselectable">
149 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Start·outer·transaction&quot;</span><span·class="p"·data-group-id="9751452480-2">)</span><span·class="p">,</span><span·class="gp·unselectable">149 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Start·outer·transaction&quot;</span><span·class="p"·data-group-id="1198653325-2">)</span><span·class="p">,</span><span·class="gp·unselectable">
150 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-3">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new_tid</span><span·class="p">,</span><span·class="gp·unselectable">150 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-3">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new_tid</span><span·class="p">,</span><span·class="gp·unselectable">
151 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;New·transaction·id·is·4711&quot;</span><span·class="p"·data-group-id="9751452480-3">)</span><span·class="p">,</span><span·class="gp·unselectable">151 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;New·transaction·id·is·4711&quot;</span><span·class="p"·data-group-id="1198653325-3">)</span><span·class="p">,</span><span·class="gp·unselectable">
152 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-4">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">try_write_lock</span><span·class="p">,</span><span·class="gp·unselectable">152 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-4">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">try_write_lock</span><span·class="p">,</span><span·class="gp·unselectable">
153 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Acquire·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="9751452480-4">)</span><span·class="p">,</span><span·class="gp·unselectable">153 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Acquire·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="1198653325-4">)</span><span·class="p">,</span><span·class="gp·unselectable">
154 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-5">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">granted</span><span·class="p">,</span><span·class="gp·unselectable">154 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-5">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">granted</span><span·class="p">,</span><span·class="gp·unselectable">
155 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;You·got·the·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="9751452480-5">)</span><span·class="p">,</span><span·class="gp·unselectable">155 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;You·got·the·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="1198653325-5">)</span><span·class="p">,</span><span·class="gp·unselectable">
156 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-6">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">do_commit</span><span·class="p">,</span><span·class="gp·unselectable">156 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-6">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">do_commit</span><span·class="p">,</span><span·class="gp·unselectable">
157 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Perform··transaction·commit&quot;</span><span·class="p"·data-group-id="9751452480-6">)</span><span·class="p">,</span><span·class="gp·unselectable">157 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Perform··transaction·commit&quot;</span><span·class="p"·data-group-id="1198653325-6">)</span><span·class="p">,</span><span·class="gp·unselectable">
158 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-7">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">release_tid</span><span·class="p">,</span><span·class="gp·unselectable">158 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-7">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">release_tid</span><span·class="p">,</span><span·class="gp·unselectable">
159 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Release·all·locks·for·transaction·4711&quot;</span><span·class="p"·data-group-id="9751452480-7">)</span><span·class="p">,</span><span·class="gp·unselectable">159 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Release·all·locks·for·transaction·4711&quot;</span><span·class="p"·data-group-id="1198653325-7">)</span><span·class="p">,</span><span·class="gp·unselectable">
160 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-8">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete_transaction</span><span·class="p">,</span><span·class="gp·unselectable">160 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-8">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete_transaction</span><span·class="p">,</span><span·class="gp·unselectable">
161 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;End·of·outer·transaction&quot;</span><span·class="p"·data-group-id="9751452480-8">)</span><span·class="p">,</span><span·class="gp·unselectable">161 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;End·of·outer·transaction&quot;</span><span·class="p"·data-group-id="1198653325-8">)</span><span·class="p">,</span><span·class="gp·unselectable">
162 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9751452480-9">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_outer</span><span·class="p">,</span><span·class="gp·unselectable">162 3&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1198653325-9">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_outer</span><span·class="p">,</span><span·class="gp·unselectable">
163 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Transaction·returned·{atomic,·ok}&quot;</span><span·class="p"·data-group-id="9751452480-9">)</span><span·class="p">.</span><span·class="w">163 3&gt;·</span><span·class="w">··························</span><span·class="s">&quot;Transaction·returned·{atomic,·ok}&quot;</span><span·class="p"·data-group-id="1198653325-9">)</span><span·class="p">.</span><span·class="w">
164 </span><span·class="p"·data-group-id="9751452480-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="9751452480-11">{</span><span·class="ss">table_handle</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.39</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="mi">16402</span><span·class="p">,</span><span·class="ss">trace_ts</span><span·class="p">,</span><span·class="w">164 </span><span·class="p"·data-group-id="1198653325-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1198653325-11">{</span><span·class="ss">table_handle</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.39</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="mi">16402</span><span·class="p">,</span><span·class="ss">trace_ts</span><span·class="p">,</span><span·class="w">
165 ·····</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">et_collector</span><span·class="p">.</span><span·class="mf">0.62831470</span><span·class="o">&gt;</span><span·class="p"·data-group-id="9751452480-11">}</span><span·class="p"·data-group-id="9751452480-10">}</span></code></pre><p>This·actually·is·a·simulation·of·the·process·<code·class="inline">Events</code>·caused·by·a·<code·class="inline">Mnesia</code>165 ·····</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">et_collector</span><span·class="p">.</span><span·class="mf">0.62831470</span><span·class="o">&gt;</span><span·class="p"·data-group-id="1198653325-11">}</span><span·class="p"·data-group-id="1198653325-10">}</span></code></pre><p>This·actually·is·a·simulation·of·the·process·<code·class="inline">Events</code>·caused·by·a·<code·class="inline">Mnesia</code>
166 transaction·that·writes·a·record·in·a·local·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="5490523569-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="5490523569-2">(</span><span·class="p"·data-group-id="5490523569-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</sp[·...·truncated·by·diffoscope;·len:·539,·SHA:·483fe13901763288d3d64e87e2b2301ca68c1271541fc67e5196da49f6c7c3a3·...·]-1">)</span><span·class="p">.</span></code></pre><p>At·this·stage·when·we·have·a·couple·of·<code·class="inline">Events</code>,·it·is·time·to·show·how·it·looks166 transaction·that·writes·a·record·in·a·local·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="5432858636-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="5432858636-2">(</span><span·class="p"·data-group-id="5432858636-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</sp[·...·truncated·by·diffoscope;·len:·539,·SHA:·916025c85279cd710d96666a9a2a69f7e9be00d933ba45be66b1f7205bb35475·...·]-1">)</span><span·class="p">.</span></code></pre><p>At·this·stage·when·we·have·a·couple·of·<code·class="inline">Events</code>,·it·is·time·to·show·how·it·looks
167 like·in·the·graphical·interface·of·<code·class="inline">et_viewer</code>:</p><p><img·src="assets/sim_trans.png"·alt="A·simulated·Mnesia·transaction·which·writes·one·record"·title="A·simulated·Mnesia·transaction·which·writes·one·record"/></p><p>In·the·sequence·chart,·the·actors·(which·symbolically·has·performed·the·<code·class="inline">Event</code>)167 like·in·the·graphical·interface·of·<code·class="inline">et_viewer</code>:</p><p><img·src="assets/sim_trans.png"·alt="A·simulated·Mnesia·transaction·which·writes·one·record"·title="A·simulated·Mnesia·transaction·which·writes·one·record"/></p><p>In·the·sequence·chart,·the·actors·(which·symbolically·has·performed·the·<code·class="inline">Event</code>)
168 are·shown·as·named·vertical·bars.·The·order·of·the·actors·may·be·altered·by168 are·shown·as·named·vertical·bars.·The·order·of·the·actors·may·be·altered·by
169 dragging·(hold·mouse·button·1·pressed·during·the·operation)·the·name·tag·of·an169 dragging·(hold·mouse·button·1·pressed·during·the·operation)·the·name·tag·of·an
170 actor·and·drop·it·elsewhere:</p><p><img·src="assets/sim_trans_move_actor.png"·alt="Two·actors·has·switched·places"·title="Two·actors·has·switched·places"/></p><p>An·<code·class="inline">Event</code>·may·be·an·action·performed·by·one·single·actor·(blue·text·label)·or170 actor·and·drop·it·elsewhere:</p><p><img·src="assets/sim_trans_move_actor.png"·alt="Two·actors·has·switched·places"·title="Two·actors·has·switched·places"/></p><p>An·<code·class="inline">Event</code>·may·be·an·action·performed·by·one·single·actor·(blue·text·label)·or
171 it·may·involve·two·actors·and·is·then·depicted·as·an·arrow·directed·from·one171 it·may·involve·two·actors·and·is·then·depicted·as·an·arrow·directed·from·one
172 actor·to·another·(red·text·label).·Details·of·an·<code·class="inline">Event</code>·can·be·shown·by172 actor·to·another·(red·text·label).·Details·of·an·<code·class="inline">Event</code>·can·be·shown·by
173 clicking·(press·and·release·the·mouse·button·1)·on·the·event·label·text·or·on173 clicking·(press·and·release·the·mouse·button·1)·on·the·event·label·text·or·on
Offset 177, 19 lines modifiedOffset 177, 19 lines modified
177 ··<a·href="#filters-and-dictionary"·class="hover-link">177 ··<a·href="#filters-and-dictionary"·class="hover-link">
178 ····<i·class="ri-link-m"·aria-hidden="true"></i>178 ····<i·class="ri-link-m"·aria-hidden="true"></i>
179 ··</a>179 ··</a>
180 ··<span·class="text">Filters·and·dictionary</span>180 ··<span·class="text">Filters·and·dictionary</span>
181 </h2>181 </h2>
182 <p>The·<code·class="inline">Event·Tracer·(ET)</code>·uses·named·filters·in·various·contexts.·An·Event·Trace182 <p>The·<code·class="inline">Event·Tracer·(ET)</code>·uses·named·filters·in·various·contexts.·An·Event·Trace
183 filter·is·an·<code·class="inline">Erlang·fun</code>·that·takes·some·trace·data·as·input·and·returns·a183 filter·is·an·<code·class="inline">Erlang·fun</code>·that·takes·some·trace·data·as·input·and·returns·a
184 possibly·modified·version·of·it:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">filter</span><span·class="p"·data-group-id="4971998314-1">(</span><span·class="n">TraceData</span><span·class="p"·data-group-id="4971998314-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">|</s[·...·truncated·by·diffoscope;·len:·329,·SHA:·fa25ce3d2dd33e89715de89158dad0f03a83579b96493bc9ecf930018172180d·...·]-2">}</span><span·class="w">184 possibly·modified·version·of·it:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">filter</span><span·class="p"·data-group-id="0065903813-1">(</span><span·class="n">TraceData</span><span·class="p"·data-group-id="0065903813-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">|</s[·...·truncated·by·diffoscope;·len:·329,·SHA:·c2fc4c01fc4efdb77584c0854e88a4e2eb0c30715904fefc29f15ec82d835eba·...·]-2">}</span><span·class="w">
  
185 </span><span·class="n">TraceData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Event</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">erlang_trace_data</span><span·class="p"·data-group-id="4971998314-3">(</span><span·class="p"·data-group-id="4971998314-3">)</span><span·class="w">185 </span><span·class="n">TraceData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Event</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">erlang_trace_data</span><span·class="p"·data-group-id="0065903813-3">(</span><span·class="p"·data-group-id="0065903813-3">)</span><span·class="w">
186 </span><span·class="n">Event</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="4971998314-4">{</span><span·class="p"·data-group-id="4971998314-4">}</span><span·class="w">186 </span><span·class="n">Event</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="0065903813-4">{</span><span·class="p"·data-group-id="0065903813-4">}</span><span·class="w">
187 </span><span·class="n">NewEvent</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="4971998314-5">{</span><span·class="p"·data-group-id="4971998314-5">}</span></code></pre><p>The·interface·of·the·filter·function·is·the·same·as·the·the·filter·functions·for187 </span><span·class="n">NewEvent</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="0065903813-5">{</span><span·class="p"·data-group-id="0065903813-5">}</span></code></pre><p>The·interface·of·the·filter·function·is·the·same·as·the·the·filter·functions·for
188 the·good·old·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#filtermap/2"><code·class="inline">lists:filtermap/2</code></a>.·If·the·filter·returns·<code·class="inline">false</code>·it·means·that188 the·good·old·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#filtermap/2"><code·class="inline">lists:filtermap/2</code></a>.·If·the·filter·returns·<code·class="inline">false</code>·it·means·that
189 the·trace·data·should·silently·be·dropped.·<code·class="inline">true</code>·means·that·the·trace·data·data189 the·trace·data·should·silently·be·dropped.·<code·class="inline">true</code>·means·that·the·trace·data·data
190 already·is·an·<code·class="inline">Event·Record</code>·and·that·it·should·be·kept·as·it·is.·<code·class="inline">true</code>·means190 already·is·an·<code·class="inline">Event·Record</code>·and·that·it·should·be·kept·as·it·is.·<code·class="inline">true</code>·means
191 that·the·<code·class="inline">TraceData</code>·already·is·an·<code·class="inline">Event·Record</code>·and·that·it·should·be·kept·as191 that·the·<code·class="inline">TraceData</code>·already·is·an·<code·class="inline">Event·Record</code>·and·that·it·should·be·kept·as
192 it·is.·<code·class="inline">{true,·NewEvent}</code>·means·that·the·original·trace·data·should·be·replaced192 it·is.·<code·class="inline">{true,·NewEvent}</code>·means·that·the·original·trace·data·should·be·replaced
193 with·<code·class="inline">Event</code>.·This·provides·means·to·get·rid·of·unwanted·<code·class="inline">Events</code>·as·well·as193 with·<code·class="inline">Event</code>.·This·provides·means·to·get·rid·of·unwanted·<code·class="inline">Events</code>·as·well·as
194 enabling·alternate·views·of·an·<code·class="inline">Event</code>.</p><p>The·first·filter·that·the·trace·data·is·exposed·for·is·the·<code·class="inline">Collector·Filter</code>.194 enabling·alternate·views·of·an·<code·class="inline">Event</code>.</p><p>The·first·filter·that·the·trace·data·is·exposed·for·is·the·<code·class="inline">Collector·Filter</code>.
Offset 208, 29 lines modifiedOffset 208, 29 lines modified
208 When·a·<code·class="inline">Viewer</code>·is·started·it·is·registered·as·a·subscriber·of·dictionary208 When·a·<code·class="inline">Viewer</code>·is·started·it·is·registered·as·a·subscriber·of·dictionary
209 updates.</p><p>In·each·<code·class="inline">Viewer</code>·there·is·only·one·filter·that·is·active·and·all·trace·<code·class="inline">Events</code>209 updates.</p><p>In·each·<code·class="inline">Viewer</code>·there·is·only·one·filter·that·is·active·and·all·trace·<code·class="inline">Events</code>
210 that·the·<code·class="inline">Viewer</code>·gets·from·the·<code·class="inline">Collector</code>·will·pass·thru·that·filter.·By210 that·the·<code·class="inline">Viewer</code>·gets·from·the·<code·class="inline">Collector</code>·will·pass·thru·that·filter.·By
211 writing·clever·filters·it·is·possible·to·customize·how·the·<code·class="inline">Events</code>·looks·like211 writing·clever·filters·it·is·possible·to·customize·how·the·<code·class="inline">Events</code>·looks·like
212 in·the·viewer.·The·following·filter·in·<code·class="inline">et/examples/et_demo.erl</code>·replaces·the212 in·the·viewer.·The·following·filter·in·<code·class="inline">et/examples/et_demo.erl</code>·replaces·the
213 actor·names·<code·class="inline">mnesia_tm</code>·and·<code·class="inline">mnesia_locker</code>·and·leaves·everything·else·in·the213 actor·names·<code·class="inline">mnesia_tm</code>·and·<code·class="inline">mnesia_locker</code>·and·leaves·everything·else·in·the
214 record·as·it·was:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">214 record·as·it·was:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
215 </span><span·class="nf">mgr_actors</span><span·class="p"·data-group-id="5846829263-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="5846829263-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="5846829263-2">(</s[·...·truncated·by·diffoscope;·len:·145,·SHA:·8a05e1557a71a9c981e012b44581d930adc9581162172f4611d319a23fcdf874·...·]3-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">215 </span><span·class="nf">mgr_actors</span><span·class="p"·data-group-id="3994600993-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="3994600993-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="3994600993-2">(</s[·...·truncated·by·diffoscope;·len:·145,·SHA:·cda5153b48343246525cbfefa942614ed6657b4a48e72ab9f7e31b27c44f3b39·...·]3-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
216 ····</span><span·class="n">Actor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="5846829263-3">(</span><span·class="n">A</span><span·class="p"·data-group-id="5846829263-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">216 ····</span><span·class="n">Actor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="3994600993-3">(</span><span·class="n">A</span><span·class="p"·data-group-id="3994600993-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
217 ···············</span><span·class="k">case</span><span·class="w">·</span><span·class="n">A</span><span·class="w">·</span><span·class="k">of</span><span·class="w">217 ···············</span><span·class="k">case</span><span·class="w">·</span><span·class="n">A</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
218 ···················</span><span·class="ss">mnesia_tm</span><span·class="w">·····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">trans_mgr</span><span·class="p">;</span><span·class="w">218 ···················</span><span·class="ss">mnesia_tm</span><span·class="w">·····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">trans_mgr</span><span·class="p">;</span><span·class="w">
219 ···················</span><span·class="ss">mnesia_locker</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">lock_mgr</span><span·class="p">;</span><span·class="w">219 ···················</span><span·class="ss">mnesia_locker</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">lock_mgr</span><span·class="p">;</span><span·class="w">
220 ···················</span><span·class="p">_</span><span·class="w">·············</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">A</span><span·class="w">220 ···················</span><span·class="p">_</span><span·class="w">·············</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">A</span><span·class="w">
221 ···············</span><span·class="k">end</span><span·class="w">221 ···············</span><span·class="k">end</span><span·class="w">
222 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">222 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
223 ····</span><span·class="p"·data-group-id="5846829263-4">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="5846829263-5">{</span><span·class="ss">from</span>[·...·truncated·by·diffoscope;·len:·322,·SHA:·331a742123bb80bbd3d23158a3fe59f8911619c6c247f6a6eeaaa65c0245b07c·...·]3-6">)</span><span·class="p">,</span><span·class="w">223 ····</span><span·class="p"·data-group-id="3994600993-4">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="3994600993-5">{</span><span·class="ss">from</span>[·...·truncated·by·diffoscope;·len:·322,·SHA:·63757ae13a5cce03a6a0ed580bc7ec2010d1b2e9db81454c5b44bc5f72b23a26·...·]3-6">)</span><span·class="p">,</span><span·class="w">
224 ···················</span><span·class="ss">to</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Actor</span><span·class="p"·data-group-id="5846829263-7">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-group-id="5846829263-7">)</span><span·class="p">,</span><span·class="w">224 ···················</span><span·class="ss">to</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Actor</span><span·class="p"·data-group-id="3994600993-7">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-group-id="3994600993-7">)</span><span·class="p">,</span><span·class="w">
225 ···················</span><span·class="ss">contents</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5846829263-8">[</span><span·class="p"·data-group-id="5846829263-9">{</span><span·class="ss">orig_from</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·69,·SHA:·0b4a0f836dab71b5d52a86e78495068cedb8f3eb6a62875284547d6053943b96·...·]3-9">}</span><span·class="p">,</span><span·class="w">225 ···················</span><span·class="ss">contents</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3994600993-8">[</span><span·class="p"·data-group-id="3994600993-9">{</span><span·class="ss">orig_from</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·69,·SHA:·ece706c7740435eea93f496d43ffdf6fcc2034bf8651dec07cad28663f390a7b·...·]3-9">}</span><span·class="p">,</span><span·class="w">
226 ·······························</span><span·class="p"·data-group-id="5846829263-10">{</span><span·class="ss">orig_to</span><span·class="p">,</span><span·class="w">···</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·263a103e6df0998a9af0d80aa1f3c63d43a1d05f57f5a49fe5df02ae80ab4797·...·]3-10">}</span><span·class="p">,</span><span·class="w">226 ·······························</span><span·class="p"·data-group-id="3994600993-10">{</span><span·class="ss">orig_to</span><span·class="p">,</span><span·class="w">···</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·58e8332343a20a9fe8235986cf155a3558e4c66f85672f9f84a4e7875fd19265·...·]3-10">}</span><span·class="p">,</span><span·class="w">
227 ·······························</span><span·class="p"·data-group-id="5846829263-11">{</span><span·class="ss">orig_contents</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">contents</span><span·class="p"[·...·truncated·by·diffoscope;·len:·949,·SHA:·1f8a57f53fff938e2fe7960f2ed5b621dba64505921db9b7141f887007e6906c·...·]-2">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">227 ·······························</span><span·class="p"·data-group-id="3994600993-11">{</span><span·class="ss">orig_contents</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">contents</span><span·class="p"[·...·truncated·by·diffoscope;·len:·949,·SHA:·4b598305c7544de3f81174d7f80b8244df3a83cdbd844e875dadc83656d869b6·...·]-2">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
228 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">6.13229925</span><span·class="o">&gt;</span><span·class="gp·unselectable">228 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="p">.</span><span·class="mf">6.13229925</span><span·class="o">&gt;</span><span·class="gp·unselectable">
229 5&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">dict_insert</span><span·class="p"·data-group-id="4059117851-3">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4059117851-4">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mgr_ac[·...·truncated·by·diffoscope;·len:·179,·SHA:·b69f286c6a7aa9ac3548b516bd8a528c0ac2c6478d476c42eb289201cf28d8c1·...·]-3">)</span><span·class="p">.</span><span·class="w">229 5&gt;·</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">dict_insert</span><span·class="p"·data-group-id="6133556183-3">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6133556183-4">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mgr_ac[·...·truncated·by·diffoscope;·len:·179,·SHA:·2653428be6485a32abb22ebf9ac492c3ddcbe3dbd7f936ac16203ef39270ef38·...·]-3">)</span><span·class="p">.</span><span·class="w">
230 </span><span·class="ss">ok</span></code></pre><p>you·will·see·that·the·<code·class="inline">Filter</code>·menu·in·all·viewers·have·got·a·new·entry·called230 </span><span·class="ss">ok</span></code></pre><p>you·will·see·that·the·<code·class="inline">Filter</code>·menu·in·all·viewers·have·got·a·new·entry·called
231 <code·class="inline">mgr_actors</code>.·Select·it,·and·a·new·<code·class="inline">Viewer</code>·window·will·pop·up:</p><p><img·src="assets/sim_trans_mgr_actors.png"·alt="The·same·trace·data·in·a·different·view"·title="The·same·trace·data·in·a·different·view"/></p><p>In·order·to·see·the·nitty·gritty·details·of·an·<code·class="inline">Event</code>·you·may·click·on·the231 <code·class="inline">mgr_actors</code>.·Select·it,·and·a·new·<code·class="inline">Viewer</code>·window·will·pop·up:</p><p><img·src="assets/sim_trans_mgr_actors.png"·alt="The·same·trace·data·in·a·different·view"·title="The·same·trace·data·in·a·different·view"/></p><p>In·order·to·see·the·nitty·gritty·details·of·an·<code·class="inline">Event</code>·you·may·click·on·the
232 <code·class="inline">Event</code>·in·order·to·start·a·<code·class="inline">Contents·Viewer</code>·for·that·<code·class="inline">Event</code>.·In·the232 <code·class="inline">Event</code>·in·order·to·start·a·<code·class="inline">Contents·Viewer</code>·for·that·<code·class="inline">Event</code>.·In·the
233 <code·class="inline">Contents·Viewer</code>·there·also·is·a·filter·menu·that·enables·inspection·of·the233 <code·class="inline">Contents·Viewer</code>·there·also·is·a·filter·menu·that·enables·inspection·of·the
234 <code·class="inline">Event</code>·from·other·views·than·the·one·selected·in·the·viewer.·A·click·on·the234 <code·class="inline">Event</code>·from·other·views·than·the·one·selected·in·the·viewer.·A·click·on·the
235 <code·class="inline">new_tid</code>·<code·class="inline">Event</code>·will·cause·a·<code·class="inline">Contents·Viewer</code>·window·to·pop·up,·showing·the235 <code·class="inline">new_tid</code>·<code·class="inline">Event</code>·will·cause·a·<code·class="inline">Contents·Viewer</code>·window·to·pop·up,·showing·the
236 <code·class="inline">Event</code>·in·the·<code·class="inline">mgr_actors</code>·view:</p><p><img·src="assets/sim_trans_contents_viewer_mgr_actors.png"·alt="The·trace·Event·in·the·mgr_actors·view"·title="The·trace·Event·in·the·mgr_actors·view"/></p><p>Select·the·<code·class="inline">all</code>·entry·in·the·<code·class="inline">Filters</code>·menu·and·a·new·<code·class="inline">Contents·Viewer·window</code>236 <code·class="inline">Event</code>·in·the·<code·class="inline">mgr_actors</code>·view:</p><p><img·src="assets/sim_trans_contents_viewer_mgr_actors.png"·alt="The·trace·Event·in·the·mgr_actors·view"·title="The·trace·Event·in·the·mgr_actors·view"/></p><p>Select·the·<code·class="inline">all</code>·entry·in·the·<code·class="inline">Filters</code>·menu·and·a·new·<code·class="inline">Contents·Viewer·window</code>
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419 ······<p·class="built-using">419 ······<p·class="built-using">
420 ········Built·using420 ········Built·using
421 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the421 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
422 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>422 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
423 ······</p>423 ······</p>
424 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>424 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
425 ····</footer>425 ····</footer>
426 ··</div>426 ··</div>
427 </main>427 </main>
428 </div>428 </div>
429 <script>429 <script>
430 ··function·mermaidLoaded()·{430 ··function·mermaidLoaded()·{
431 ····mermaid.initialize({431 ····mermaid.initialize({
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129 ··<a·href="#a-simulated-mnesia-transaction"·class="hover-link">129 ··<a·href="#a-simulated-mnesia-transaction"·class="hover-link">
130 ····<i·class="ri-link-m"·aria-hidden="true"></i>130 ····<i·class="ri-link-m"·aria-hidden="true"></i>
131 ··</a>131 ··</a>
132 ··<span·class="text">A·simulated·Mnesia·transaction</span>132 ··<span·class="text">A·simulated·Mnesia·transaction</span>
133 </h2>133 </h2>
134 <p>The·Erlang·code·for·running·the·simulated·<code·class="inline">Mnesia</code>·transaction·example·in·the134 <p>The·Erlang·code·for·running·the·simulated·<code·class="inline">Mnesia</code>·transaction·example·in·the
135 previous·chapter·is·included·in·the·<code·class="inline">et/examples/et_demo.erl</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">135 previous·chapter·is·included·in·the·<code·class="inline">et/examples/et_demo.erl</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
136 </span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="5783102829-1">(</span><span·class="p"·data-group-id="5783102829-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">136 </span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="0715626281-1">(</span><span·class="p"·data-group-id="0715626281-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
137 ····</span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="5783102829-2">(</span><span·class="p"·data-group-id="5783102829-3">[</span><span·class="p"·data-group-id="5783102829-3">]</span><span·class="p"·data-group-id="5783102829-2">)</span><span·class="p">.</span><span·class="w">137 ····</span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="0715626281-2">(</span><span·class="p"·data-group-id="0715626281-3">[</span><span·class="p"·data-group-id="0715626281-3">]</span><span·class="p"·data-group-id="0715626281-2">)</span><span·class="p">.</span><span·class="w">
  
138 </span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="5783102829-4">(</span><span·class="n">ExtraOptions</span><span·class="p"·data-group-id="5783102829-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 </span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="0715626281-4">(</span><span·class="n">ExtraOptions</span><span·class="p"·data-group-id="0715626281-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ····</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5783102829-5">[</span><span·class="p"·data-group-id="5783102829-6">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5783102829-7">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mgr_actors</span><span·class="p"·data-group-id="5783102829-7">}</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">mgr_actors</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="5783102829-6">}</span><span·class="p"·data-group-id="5783102829-5">]</span><span·class="p">,</span><span·class="w"> 
140 ····</span><span·class="p"·data-group-id="5783102829-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="5783102829-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class=[·...·truncated·by·diffoscope;·len:·340,·SHA:·80b416ee8979c40a12bdb6af0a84f6234be44dd9271dce4f30ad02a5752d89a4·...·]</span><span·class="p">,</span><span·class="w">139 ····</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0715626281-5">[</span><span·class="p"·data-group-id="0715626281-6">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·520,·SHA:·0c9a4eedad660e81615a8fac3a484f77ee44f440b3b04677bce8ab39a27e26d9·...·]</span><span·class="p">,</span><span·class="w">
 140 ····</span><span·class="p"·data-group-id="0715626281-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="0715626281-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="0715626281-9">(</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">ExtraOptions</span><span·class="p"·data-group-id="0715626281-9">)</span><span·class="p">,</span><span·class="w">
141 ····</span><span·class="n">Collector</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="5783102829-10">(</span><span·class="n">Viewer</span><span·class="p"·data-group-id="5783102829-10">)</span><span·class="p">,</span><span·class="w">141 ····</span><span·class="n">Collector</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="0715626281-10">(</span><span·class="n">Viewer</span><span·class="p"·data-group-id="0715626281-10">)</span><span·class="p">,</span><span·class="w">
142 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-11">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_outer</span><span·class="p">,</span><span·class="w">142 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-11">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start_outer</span><span·class="p">,</span><span·class="w">
143 ······························</span><span·class="s">&quot;Start·outer·transaction&quot;</span><span·class="p"·data-group-id="5783102829-11">)</span><span·class="p">,</span><span·class="w">143 ······························</span><span·class="s">&quot;Start·outer·transaction&quot;</span><span·class="p"·data-group-id="0715626281-11">)</span><span·class="p">,</span><span·class="w">
144 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-12">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new_tid</span><span·class="p">,</span><span·class="w">144 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-12">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new_tid</span><span·class="p">,</span><span·class="w">
145 ······························</span><span·class="s">&quot;New·transaction·id·is·4711&quot;</span><span·class="p"·data-group-id="5783102829-12">)</span><span·class="p">,</span><span·class="w">145 ······························</span><span·class="s">&quot;New·transaction·id·is·4711&quot;</span><span·class="p"·data-group-id="0715626281-12">)</span><span·class="p">,</span><span·class="w">
146 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-13">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">try_write_lock</span><span·class="p">,</span><span·class="w">146 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-13">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">try_write_lock</span><span·class="p">,</span><span·class="w">
147 ······························</span><span·class="s">&quot;Acquire·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="5783102829-13">)</span><span·class="p">,</span><span·class="w">147 ······························</span><span·class="s">&quot;Acquire·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="0715626281-13">)</span><span·class="p">,</span><span·class="w">
148 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-14">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">granted</span><span·class="p">,</span><span·class="w">148 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-14">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">granted</span><span·class="p">,</span><span·class="w">
149 ······························</span><span·class="s">&quot;You·got·the·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="5783102829-14">)</span><span·class="p">,</span><span·class="w">149 ······························</span><span·class="s">&quot;You·got·the·write·lock·for·{my_tab,·key}&quot;</span><span·class="p"·data-group-id="0715626281-14">)</span><span·class="p">,</span><span·class="w">
150 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-15">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">do_commit</span><span·class="p">,</span><span·class="w">150 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-15">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">do_commit</span><span·class="p">,</span><span·class="w">
151 ······························</span><span·class="s">&quot;Perform··transaction·commit&quot;</span><span·class="p"·data-group-id="5783102829-15">)</span><span·class="p">,</span><span·class="w">151 ······························</span><span·class="s">&quot;Perform··transaction·commit&quot;</span><span·class="p"·data-group-id="0715626281-15">)</span><span·class="p">,</span><span·class="w">
152 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-16">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">release_tid</span><span·class="p">,</span><span·class="w">152 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-16">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">40</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_locker</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">release_tid</span><span·class="p">,</span><span·class="w">
153 ······························</span><span·class="s">&quot;Release·all·locks·for·transaction·4711&quot;</span><span·class="p"·data-group-id="5783102829-16">)</span><span·class="p">,</span><span·class="w">153 ······························</span><span·class="s">&quot;Release·all·locks·for·transaction·4711&quot;</span><span·class="p"·data-group-id="0715626281-16">)</span><span·class="p">,</span><span·class="w">
154 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-17">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete_transaction</span><span·class="p">,</span><span·class="w">154 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-17">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">60</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_tm</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete_transaction</span><span·class="p">,</span><span·class="w">
155 ······························</span><span·class="s">&quot;End·of·outer·transaction&quot;</span><span·class="p"·data-group-id="5783102829-17">)</span><span·class="p">,</span><span·class="w">155 ······························</span><span·class="s">&quot;End·of·outer·transaction&quot;</span><span·class="p"·data-group-id="0715626281-17">)</span><span·class="p">,</span><span·class="w">
156 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="5783102829-18">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_outer</span><span·class="p">,</span><span·class="w">156 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="0715626281-18">(</span><span·class="n">Collector</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_shell</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">end_outer</span><span·class="p">,</span><span·class="w">
157 ······························</span><span·class="s">&quot;Transaction·returned·{atomic,·ok}&quot;</span><span·class="p"·data-group-id="5783102829-18">)</span><span·class="p">,</span><span·class="w">157 ······························</span><span·class="s">&quot;Transaction·returned·{atomic,·ok}&quot;</span><span·class="p"·data-group-id="0715626281-18">)</span><span·class="p">,</span><span·class="w">
158 ····</span><span·class="p"·data-group-id="5783102829-19">{</span><span·class="ss">collector</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Collector</span><span·class="p"·data-group-id="5783102829-19">}</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="w">158 ····</span><span·class="p"·data-group-id="0715626281-19">{</span><span·class="ss">collector</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Collector</span><span·class="p"·data-group-id="0715626281-19">}</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
159 </span><span·class="nf">mgr_actors</span><span·class="p"·data-group-id="9062644096-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="9062644096-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="9062644096-2">(</s[·...·truncated·by·diffoscope;·len:·146,·SHA:·282b5f9b2efdc4d57566e2dc2bab98aa91fd9a2d30e35541a434eb5120daaf80·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 </span><span·class="nf">mgr_actors</span><span·class="p"·data-group-id="0910331484-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="0910331484-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="0910331484-2">(</s[·...·truncated·by·diffoscope;·len:·146,·SHA:·162c7c64b7e7d609e395f6c584000ade4b2e93357299178059a47ef384c316ee·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ····</span><span·class="n">Actor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="9062644096-3">(</span><span·class="n">A</span><span·class="p"·data-group-id="9062644096-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">160 ····</span><span·class="n">Actor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0910331484-3">(</span><span·class="n">A</span><span·class="p"·data-group-id="0910331484-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
161 ···············</span><span·class="k">case</span><span·class="w">·</span><span·class="n">A</span><span·class="w">·</span><span·class="k">of</span><span·class="w">161 ···············</span><span·class="k">case</span><span·class="w">·</span><span·class="n">A</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
162 ···················</span><span·class="ss">mnesia_tm</span><span·class="w">·····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">trans_mgr</span><span·class="p">;</span><span·class="w">162 ···················</span><span·class="ss">mnesia_tm</span><span·class="w">·····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">trans_mgr</span><span·class="p">;</span><span·class="w">
163 ···················</span><span·class="ss">mnesia_locker</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">lock_mgr</span><span·class="p">;</span><span·class="w">163 ···················</span><span·class="ss">mnesia_locker</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">lock_mgr</span><span·class="p">;</span><span·class="w">
164 ···················</span><span·class="p">_</span><span·class="w">·············</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">A</span><span·class="w">164 ···················</span><span·class="p">_</span><span·class="w">·············</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">A</span><span·class="w">
165 ···············</span><span·class="k">end</span><span·class="w">165 ···············</span><span·class="k">end</span><span·class="w">
166 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">166 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
167 ····</span><span·class="p"·data-group-id="9062644096-4">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="9062644096-5">{</span><span·class="ss">from</span>[·...·truncated·by·diffoscope;·len:·323,·SHA:·00950bfdc5f1abc82516eb414ad5a1a63a8cb880d467a5fc57882b23c3d85e3b·...·]-6">)</span><span·class="p">,</span><span·class="w">167 ····</span><span·class="p"·data-group-id="0910331484-4">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="0910331484-5">{</span><span·class="ss">from</span>[·...·truncated·by·diffoscope;·len:·323,·SHA:·f861d32b1730629ce1799897045674552d2c360490fd82bab8ebd025b32fb5b5·...·]-6">)</span><span·class="p">,</span><span·class="w">
168 ···················</span><span·class="ss">to</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Actor</span><span·class="p"·data-group-id="9062644096-7">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-group-id="9062644096-7">)</span><span·class="p">,</span><span·class="w">168 ···················</span><span·class="ss">to</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Actor</span><span·class="p"·data-group-id="0910331484-7">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-group-id="0910331484-7">)</span><span·class="p">,</span><span·class="w">
169 ···················</span><span·class="ss">contents</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9062644096-8">[</span><span·class="p"·data-group-id="9062644096-9">{</span><span·class="ss">orig_from</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·70,·SHA:·78d3f587a4eafda1a715ce4d3db49f8831750ba455dd08dbbd8a23058c7d02d6·...·]-9">}</span><span·class="p">,</span><span·class="w">169 ···················</span><span·class="ss">contents</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0910331484-8">[</span><span·class="p"·data-group-id="0910331484-9">{</span><span·class="ss">orig_from</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·70,·SHA:·bfad5ca2907620ec0b7e43d3da6a9c10354c74c2b5056d1e74c3821b97222b50·...·]-9">}</span><span·class="p">,</span><span·class="w">
170 ·······························</span><span·class="p"·data-group-id="9062644096-10">{</span><span·class="ss">orig_to</span><span·class="p">,</span><span·class="w">···</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·8eb5fb5a5cf7b4a3421507eae8ba2a23b53222d0801d22ee765af306327658d4·...·]-10">}</span><span·class="p">,</span><span·class="w">170 ·······························</span><span·class="p"·data-group-id="0910331484-10">{</span><span·class="ss">orig_to</span><span·class="p">,</span><span·class="w">···</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">to</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·34d6d420fe006ce96829f525ca6a590e8cfca71a5891d4b269b9d68f154dd109·...·]-10">}</span><span·class="p">,</span><span·class="w">
171 ·······························</span><span·class="p"·data-group-id="9062644096-11">{</span><span·class="ss">orig_contents</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">contents</span><span·class="p"[·...·truncated·by·diffoscope;·len:·186,·SHA:·2ec7653c0b95cb6825cedfe73ae8322fc87599818fb1cfd8084518b78fcfae4f·...·]-4">}</span><span·class="p">.</span></code></pre><p>If·you·invoke·the·<code·class="inline">et_demo:sim_trans()</code>·function,·a·<code·class="inline">Viewer</code>·window·will·pop·up171 ·······························</span><span·class="p"·data-group-id="0910331484-11">{</span><span·class="ss">orig_contents</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">contents</span><span·class="p"[·...·truncated·by·diffoscope;·len:·186,·SHA:·a9f1e0b31175b69f6ce00c127c4bc1bafeb775216dbc096f918272be7cdf96f4·...·]-4">}</span><span·class="p">.</span></code></pre><p>If·you·invoke·the·<code·class="inline">et_demo:sim_trans()</code>·function,·a·<code·class="inline">Viewer</code>·window·will·pop·up
172 and·the·sequence·trace·will·be·almost·the·same·as·if·the·following·<code·class="inline">Mnesia</code>172 and·the·sequence·trace·will·be·almost·the·same·as·if·the·following·<code·class="inline">Mnesia</code>
173 transaction·would·have·been·run:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="3967481971-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3967481971-2">(</span><span·class="p"·data-group-id="3967481971-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</[·...·truncated·by·diffoscope;·len:·2205,·SHA:·68578f7ec521b53ea4d317191ec8d97acfffd06acecc64550aabafd4527ca148·...·]-6">]</span><span·class="w">173 transaction·would·have·been·run:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="6894884345-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="6894884345-2">(</span><span·class="p"·data-group-id="6894884345-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</[·...·truncated·by·diffoscope;·len:·2205,·SHA:·4f07882844712d56e2d7da61f328007f823058f728a217c7e350b38aa37b1d33·...·]-6">]</span><span·class="w">
  
174 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">7.4</span><span·class="w">··</span><span·class="p"·data-group-id="8968552213-7">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="8968552213-7">)</span><span·class="gp·unselectable">174 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">7.4</span><span·class="w">··</span><span·class="p"·data-group-id="5293461012-7">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="5293461012-7">)</span><span·class="gp·unselectable">
175 1&gt;·</span><span·class="p"·data-group-id="8968552213-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="8968552213-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·282,·SHA:·f2e101e14945afe042b4e4f7b37ba3ca4d8fb671316f16464ac32eb9423657b8·...·]-9">)</span><span·class="p">.</span><span·class="w">175 1&gt;·</span><span·class="p"·data-group-id="5293461012-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="5293461012-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·282,·SHA:·07e9cb72e9f7949c97d09e56cc6538d87de65851bf68ee74b0825438389604e8·...·]-9">)</span><span·class="p">.</span><span·class="w">
176 </span><span·class="p"·data-group-id="8968552213-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">;</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·1303d0e238ff87d6181e349c6875b33955f3846ad11bdb69c07eed89cfda5cd6·...·]-11">}</span><span·class="gp·unselectable">176 </span><span·class="p"·data-group-id="5293461012-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.40</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">;</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·2711f047232d8b6360e3b333ed8fedea4ebcfa0b4217699a3856600f8123600e·...·]-11">}</span><span·class="gp·unselectable">
177 2&gt;·</span><span·class="nc">et_demo</span><span·class="p">:</span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="8968552213-12">(</span><span·class="p"·data-group-id="8968552213-12">)</span><span·class="p">.</span><span·class="w">177 2&gt;·</span><span·class="nc">et_demo</span><span·class="p">:</span><span·class="nf">sim_trans</span><span·class="p"·data-group-id="5293461012-12">(</span><span·class="p"·data-group-id="5293461012-12">)</span><span·class="p">.</span><span·class="w">
178 </span><span·class="p"·data-group-id="8968552213-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8968552213-14">{</span><span·class="ss">table_handle</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.45</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="mi">24596</span><span·class="p">,</span><span·class="ss">trace_ts</span><span·class="p">,</span><span·class="w">178 </span><span·class="p"·data-group-id="5293461012-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5293461012-14">{</span><span·class="ss">table_handle</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.45</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="mi">24596</span><span·class="p">,</span><span·class="ss">trace_ts</span><span·class="p">,</span><span·class="w">
179 ·····</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">et_collector</span><span·class="p">.</span><span·class="mf">0.62831470</span><span·class="o">&gt;</span><span·class="p"·data-group-id="8968552213-14">}</span><span·class="p"·data-group-id="8968552213-13">}</span></code></pre><p><img·src="assets/sim_trans.png"·alt="A·simulated·Mnesia·transaction·which·writes·one·record"·title="A·simulated·Mnesia·transaction·which·writes·one·record"/></p><h2·id="some-convenient-functions-used-in-the-mnesia-transaction-example"·class="section-heading">179 ·····</span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">et_collector</span><span·class="p">.</span><span·class="mf">0.62831470</span><span·class="o">&gt;</span><span·class="p"·data-group-id="5293461012-14">}</span><span·class="p"·data-group-id="5293461012-13">}</span></code></pre><p><img·src="assets/sim_trans.png"·alt="A·simulated·Mnesia·transaction·which·writes·one·record"·title="A·simulated·Mnesia·transaction·which·writes·one·record"/></p><h2·id="some-convenient-functions-used-in-the-mnesia-transaction-example"·class="section-heading">
180 ··<a·href="#some-convenient-functions-used-in-the-mnesia-transaction-example"·class="hover-link">180 ··<a·href="#some-convenient-functions-used-in-the-mnesia-transaction-example"·class="hover-link">
181 ····<i·class="ri-link-m"·aria-hidden="true"></i>181 ····<i·class="ri-link-m"·aria-hidden="true"></i>
182 ··</a>182 ··</a>
183 ··<span·class="text">Some·convenient·functions·used·in·the·Mnesia·transaction·example</span>183 ··<span·class="text">Some·convenient·functions·used·in·the·Mnesia·transaction·example</span>
184 </h2>184 </h2>
185 <p>The·<code·class="inline">module_as_actor</code>·filter·converts·the·<code·class="inline">Event·Records</code>·so·the·module·names185 <p>The·<code·class="inline">module_as_actor</code>·filter·converts·the·<code·class="inline">Event·Records</code>·so·the·module·names
186 becomes·actors·and·the·invoked·functions·becomes·labels.·If·the·information186 becomes·actors·and·the·invoked·functions·becomes·labels.·If·the·information
187 about·who·the·caller·was·it·will·be·displayed·as·an·arrow·directed·from·the187 about·who·the·caller·was·it·will·be·displayed·as·an·arrow·directed·from·the
188 caller·to·the·callee.·The·<code·class="inline">[{message,·{caller}},·{return_trace}]</code>·options·to188 caller·to·the·callee.·The·<code·class="inline">[{message,·{caller}},·{return_trace}]</code>·options·to
189 <a·href="../../../../lib/runtime_tools-2.1.1/doc/html/dbg.html#tpl/2"><code·class="inline">dbg:tpl/2</code></a>·function·will·imply·the·necessary·information·in·the·Erlang·traces.189 <a·href="../../../../lib/runtime_tools-2.1.1/doc/html/dbg.html#tpl/2"><code·class="inline">dbg:tpl/2</code></a>·function·will·imply·the·necessary·information·in·the·Erlang·traces.
190 Here·follows·the·<code·class="inline">module_as_actor</code>·filter:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">190 Here·follows·the·<code·class="inline">module_as_actor</code>·filter:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
191 </span><span·class="nf">module_as_actor</span><span·class="p"·data-group-id="4289958802-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="4289958802-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="4289958802-2">(</s[·...·truncated·by·diffoscope;·len:·146,·SHA:·fbd03b13543d1ebbe3412ab4da8afeebdb423802ff08e96d915de73102a0992f·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 </span><span·class="nf">module_as_actor</span><span·class="p"·data-group-id="7224557007-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="7224557007-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="7224557007-2">(</s[·...·truncated·by·diffoscope;·len:·146,·SHA:·703106c0253378b488f47878b05d59cbec963e39cb9e68dff2702ec126224b38·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keysearch</span><span·class="p"·data-group-id="4289958802-3">(</span><span·class="ss">mfa</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·cla[·...·truncated·by·diffoscope;·len:·88,·SHA:·fcc261503666a7536dbb92f2ace981e784e131dd7b157b220ffabe51073aaba7·...·]-3">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">192 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keysearch</span><span·class="p"·data-group-id="7224557007-3">(</span><span·class="ss">mfa</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·cla[·...·truncated·by·diffoscope;·len:·88,·SHA:·0f00ac5a7dee5692bd395e88c1ac3343a9e838e024dcf2c5f5e6bc16dc8d95c6·...·]-3">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
193 ········</span><span·class="p"·data-group-id="4289958802-4">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4289958802-5">{</span><span·class="ss">mfa</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·363,·SHA:·48b7bc0a9ca12aeaad75c77f4118c7002b7186df3402d44b51f1a22ad0f3550e·...·]-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 ········</span><span·class="p"·data-group-id="7224557007-4">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7224557007-5">{</span><span·class="ss">mfa</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·363,·SHA:·fdc3f74958778619cc9d29105a0800612e051e8e0df40712d65848aec38b13c2·...·]-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keysearch</span><span·class="p"·data-group-id="4289958802-7">(</span><span·class="ss">pam_result</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><s[·...·truncated·by·diffoscope;·len:·95,·SHA:·cc8ffa61275c185f1bcd4124fdded71aa302c6f0523d6f54d1b80d63c53dafbb·...·]-7">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">194 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keysearch</span><span·class="p"·data-group-id="7224557007-7">(</span><span·class="ss">pam_result</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><s[·...·truncated·by·diffoscope;·len:·95,·SHA:·c05908573af78ae5b05bb69d365b92ff3232873cfa7e80ecd705dc45603b5b1c·...·]-7">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
195 ················</span><span·class="p"·data-group-id="4289958802-8">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4289958802-9">{</span><span·class="ss">pam_result</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·399,·SHA:·47bc4e2954f763723d31c63da0c4c353919bb860715be6ec1e771d8a3607449a·...·]-8">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">195 ················</span><span·class="p"·data-group-id="7224557007-8">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7224557007-9">{</span><span·class="ss">pam_result</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·399,·SHA:·262d1527947a632461f82f8e6beeb7644abf030073ee26c18c7c3a37260567f3·...·]-8">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
196 ····················</span><span·class="p"·data-group-id="4289958802-11">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="4289958802-12">{</span><span·class="ss">label</sp[·...·truncated·by·diffoscope;·len:·537,·SHA:·9b2fabea858334a4d9f19d1f8ef540cf6e891363371133afc63b359b44b2effb·...·]-11">}</span><span·class="p">;</span><span·class="w">196 ····················</span><span·class="p"·data-group-id="7224557007-11">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="7224557007-12">{</span><span·class="ss">label</sp[·...·truncated·by·diffoscope;·len:·537,·SHA:·6cf5531722e2ad71a0af29a0e8aedac28ad13d14a54079f990a9903ccbb518c1·...·]-11">}</span><span·class="p">;</span><span·class="w">
197 ················</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">197 ················</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
198 ····················</span><span·class="p"·data-group-id="4289958802-13">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="4289958802-14">{</span><span·class="ss">label</sp[·...·truncated·by·diffoscope;·len:·536,·SHA:·15ea0573e352ff4d35564b79bcd7f08eb64e0c0ea25d8843bb41667fb8dc606c·...·]-13">}</span><span·class="w">198 ····················</span><span·class="p"·data-group-id="7224557007-13">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p"·data-group-id="7224557007-14">{</span><span·class="ss">label</sp[·...·truncated·by·diffoscope;·len:·536,·SHA:·be516ad3b7028fa36b772a343d23fc240edf1d44a48e5b7f2e863d7f4d8b88ed·...·]-13">}</span><span·class="w">
199 ············</span><span·class="k">end</span><span·class="p">;</span><span·class="w">199 ············</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
200 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">200 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
201 ············</span><span·class="ss">false</span><span·class="w">201 ············</span><span·class="ss">false</span><span·class="w">
202 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">plain_process_info</code>·filter·does·not·alter·the·<code·class="inline">Event·Records</code>.·It·merely202 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">plain_process_info</code>·filter·does·not·alter·the·<code·class="inline">Event·Records</code>.·It·merely
203 ensures·that·the·event·not·related·to·processes·are·skipped:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">203 ensures·that·the·event·not·related·to·processes·are·skipped:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
204 </span><span·class="nf">plain_process_info</span><span·class="p"·data-group-id="7305071042-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="7305071042-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="7305071042-2">(</s[·...·truncated·by·diffoscope;·len:·146,·SHA:·41e0fd8e5d8470b35c20a195965362193c9b4ff3a68940d33e815a77ca4f8dcb·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">204 </span><span·class="nf">plain_process_info</span><span·class="p"·data-group-id="1704934211-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="1704934211-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="1704934211-2">(</s[·...·truncated·by·diffoscope;·len:·146,·SHA:·ba35a3254b87ac55f21ce93130e3d3e9eb1428e47344ad494f6e16f7a80a1452·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
205 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="k">of</span><span·class="w">205 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
206 ········</span><span·class="nb">send</span><span·class="w">··························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">206 ········</span><span·class="nb">send</span><span·class="w">··························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
207 ········</span><span·class="ss">send_to_non_existing_process</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">207 ········</span><span·class="ss">send_to_non_existing_process</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
208 ········</span><span·class="ss">&#39;receive&#39;</span><span·class="w">·····················</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">208 ········</span><span·class="ss">&#39;receive&#39;</span><span·class="w">·····················</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
209 ········</span><span·class="nb">spawn</span><span·class="w">·························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">209 ········</span><span·class="nb">spawn</span><span·class="w">·························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
210 ········</span><span·class="nb">exit</span><span·class="w">··························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">210 ········</span><span·class="nb">exit</span><span·class="w">··························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
211 ········</span><span·class="nb">link</span><span·class="w">··························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">211 ········</span><span·class="nb">link</span><span·class="w">··························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
212 ········</span><span·class="nb">unlink</span><span·class="w">························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">212 ········</span><span·class="nb">unlink</span><span·class="w">························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
213 ········</span><span·class="ss">getting_linked</span><span·class="w">················</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">213 ········</span><span·class="ss">getting_linked</span><span·class="w">················</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
214 ········</span><span·class="p"·data-group-id="7305071042-3">{</span><span·class="ss">seq_send</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Label</span><span·class="p"·data-group-id="7305071042-3">}</span><span·class="w">············</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">214 ········</span><span·class="p"·data-group-id="1704934211-3">{</span><span·class="ss">seq_send</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Label</span><span·class="p"·data-group-id="1704934211-3">}</span><span·class="w">············</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
215 ········</span><span·class="p"·data-group-id="7305071042-4">{</span><span·class="ss">seq_receive</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Label</span><span·class="p"·data-group-id="7305071042-4">}</span><span·class="w">·········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">215 ········</span><span·class="p"·data-group-id="1704934211-4">{</span><span·class="ss">seq_receive</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Label</span><span·class="p"·data-group-id="1704934211-4">}</span><span·class="w">·········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
216 ········</span><span·class="p"·data-group-id="7305071042-5">{</span><span·class="ss">seq_print</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Label</span><span·class="p"·data-group-id="7305071042-5">}</span><span·class="w">···········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">216 ········</span><span·class="p"·data-group-id="1704934211-5">{</span><span·class="ss">seq_print</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Label</span><span·class="p"·data-group-id="1704934211-5">}</span><span·class="w">···········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
217 ········</span><span·class="p"·data-group-id="7305071042-6">{</span><span·class="ss">drop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">N</span><span·class="p"·data-group-id="7305071042-6">}</span><span·class="w">····················</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">217 ········</span><span·class="p"·data-group-id="1704934211-6">{</span><span·class="ss">drop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">N</span><span·class="p"·data-group-id="1704934211-6">}</span><span·class="w">····················</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
218 ········</span><span·class="p">_</span><span·class="w">·····························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">218 ········</span><span·class="p">_</span><span·class="w">·····························</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">
219 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">plain_process_info_nolink</code>·filter·does·not·alter·the·<code·class="inline">Event·Records</code>.·It·do219 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">plain_process_info_nolink</code>·filter·does·not·alter·the·<code·class="inline">Event·Records</code>.·It·do
220 makes·use·of·the·<code·class="inline">plain_process_info</code>·,·but·do·also·ensure·that·the·process·info220 makes·use·of·the·<code·class="inline">plain_process_info</code>·,·but·do·also·ensure·that·the·process·info
221 related·to·linking·and·unlinking·is·skipped:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">221 related·to·linking·and·unlinking·is·skipped:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
222 </span><span·class="nf">plain_process_info_nolink</span><span·class="p"·data-group-id="7722886460-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="7722886460-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="7722886460-2">(</sp[·...·truncated·by·diffoscope;·len:·145,·SHA:·33afcd287d18dd5ed79667c7a998e9ca97f87725d90034b01b12606729ee3b01·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 </span><span·class="nf">plain_process_info_nolink</span><span·class="p"·data-group-id="7494832253-1">(</span><span·class="n">E</span><span·class="p"·data-group-id="7494832253-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_record</span><span·class="p"·data-group-id="7494832253-2">(</sp[·...·truncated·by·diffoscope;·len:·145,·SHA:·185aa13e0c7e330a53917ff56e47afa7e2d7c6cd078f59fdb771cf8f10411919·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 ····</span><span·class="p"·data-group-id="7722886460-3">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="o">/=</span><span·class="w">·</span><span·class="nb">link</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·4bba9e132f2323d68d075495c576404a2b0a0118e4ca786462e4f475c9932d4e·...·]-3">)</span><span·class="w">·</span><span·class="nf">and</span><span·class="w">223 ····</span><span·class="p"·data-group-id="7494832253-3">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="o">/=</span><span·class="w">·</span><span·class="nb">link</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·2accf35271891b33a7463b243569bca4235dca3c9b08ba52735c2d230bac18e2·...·]-3">)</span><span·class="w">·</span><span·class="nf">and</span><span·class="w">
224 ····</span><span·class="p"·data-group-id="7722886460-4">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="o">/=</span><span·class="w">·</span><span·class="nb">unlink</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·d751491cc118c00c874d2246e0feacc666b4327c3bf44c2fdc8ea7a1d9ac2293·...·]-4">)</span><span·class="w">·</span><span·class="nf">and</span><span·class="w">224 ····</span><span·class="p"·data-group-id="7494832253-4">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="o">/=</span><span·class="w">·</span><span·class="nb">unlink</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·60371e55b0c7bdb5553430515dc5478626699f8a223412e13deb2cdf449f071f·...·]-4">)</span><span·class="w">·</span><span·class="nf">and</span><span·class="w">
225 ····</span><span·class="p"·data-group-id="7722886460-5">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="o">/=</span><span·class="w">·</span><span·class="ss">getting_linked<[·...·truncated·by·diffoscope;·len:·47,·SHA:·53ac0270ab0b919cc91aed53694280b8d176c717f5b0c2b435e3b46b5a02d5e5·...·]-5">)</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">225 ····</span><span·class="p"·data-group-id="7494832253-5">(</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">event</span><span·class="p">.</span><span·class="ss">label</span><span·class="w">·</span><span·class="o">/=</span><span·class="w">·</span><span·class="ss">getting_linked<[·...·truncated·by·diffoscope;·len:·47,·SHA:·6c8d157431c1bd063fff750220a03f633f36b20ace4f69ab936f6d39959ad26b·...·]-5">)</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">
226 ····</span><span·class="nf">plain_process_info</span><span·class="p"·data-group-id="7722886460-6">(</span><span·class="n">E</span><span·class="p"·data-group-id="7722886460-6">)</span><span·class="p">.</span></code></pre><p>In·order·to·simplify·the·startup·of·an·<code·class="inline">et_viewer</code>·process·with·the·filters226 ····</span><span·class="nf">plain_process_info</span><span·class="p"·data-group-id="7494832253-6">(</span><span·class="n">E</span><span·class="p"·data-group-id="7494832253-6">)</span><span·class="p">.</span></code></pre><p>In·order·to·simplify·the·startup·of·an·<code·class="inline">et_viewer</code>·process·with·the·filters
227 mentioned·above,·plus·some·others·(that·also·are·found·in227 mentioned·above,·plus·some·others·(that·also·are·found·in
228 <code·class="inline">et/examples/et_demo.erl</code>·src/et_collector.erl·the·<code·class="inline">et_demo:start/0,1</code>·functions228 <code·class="inline">et/examples/et_demo.erl</code>·src/et_collector.erl·the·<code·class="inline">et_demo:start/0,1</code>·functions
229 can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">229 can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
230 </span><span·class="nf">start</span><span·class="p"·data-group-id="1079418767-1">(</span><span·class="p"·data-group-id="1079418767-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">230 </span><span·class="nf">start</span><span·class="p"·data-group-id="0782403435-1">(</span><span·class="p"·data-group-id="0782403435-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
231 ····</span><span·class="nf">start</span><span·class="p"·data-group-id="1079418767-2">(</span><span·class="p"·data-group-id="1079418767-3">[</span><span·class="p"·data-group-id="1079418767-3">]</span><span·class="p"·data-group-id="1079418767-2">)</span><span·class="p">.</span><span·class="w">231 ····</span><span·class="nf">start</span><span·class="p"·data-group-id="0782403435-2">(</span><span·class="p"·data-group-id="0782403435-3">[</span><span·class="p"·data-group-id="0782403435-3">]</span><span·class="p"·data-group-id="0782403435-2">)</span><span·class="p">.</span><span·class="w">
  
232 </span><span·class="nf">start</span><span·class="p"·data-group-id="1079418767-4">(</span><span·class="n">ExtraOptions</span><span·class="p"·data-group-id="1079418767-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">232 </span><span·class="nf">start</span><span·class="p"·data-group-id="0782403435-4">(</span><span·class="n">ExtraOptions</span><span·class="p"·data-group-id="0782403435-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
233 ····</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1079418767-5">[</span><span·class="p"·data-group-id="1079418767-6">{</span><span·class="ss">trace_global</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="1079418767-6">}</span><span·class="p">,</span><span·class="w">233 ····</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0782403435-5">[</span><span·class="p"·data-group-id="0782403435-6">{</span><span·class="ss">trace_global</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="0782403435-6">}</span><span·class="p">,</span><span·class="w">
234 ···············</span><span·class="p"·data-group-id="1079418767-7">{</span><span·class="ss">parent_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="1079418767-7">}</span><span·class="p">,</span><span·class="w">234 ···············</span><span·class="p"·data-group-id="0782403435-7">{</span><span·class="ss">parent_pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="0782403435-7">}</span><span·class="p">,</span><span·class="w">
235 ···············</span><span·class="p"·data-group-id="1079418767-8">{</span><span·class="ss">max_actors</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="p"·data-group-id="1079418767-8">}</span><span·class="p">,</span><span·class="w">235 ···············</span><span·class="p"·data-group-id="0782403435-8">{</span><span·class="ss">max_actors</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="p"·data-group-id="0782403435-8">}</span><span·class="p">,</span><span·class="w">
236 ···············</span><span·class="p"·data-group-id="1079418767-9">{</span><span·class="ss">max_events</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1000</span><span·class="p"·data-group-id="1079418767-9">}</span><span·class="p">,</span><span·class="w">236 ···············</span><span·class="p"·data-group-id="0782403435-9">{</span><span·class="ss">max_events</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1000</span><span·class="p"·data-group-id="0782403435-9">}</span><span·class="p">,</span><span·class="w">
237 ···············</span><span·class="p"·data-group-id="1079418767-10">{</span><span·class="ss">active_filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">module_as_actor</span><span·class="p"·data-group-id="1079418767-10">}</span><span·class="p"·data-group-id="1079418767-5">]</span><span·class="p">,</span><span·class="w">237 ···············</span><span·class="p"·data-group-id="0782403435-10">{</span><span·class="ss">active_filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">module_as_actor</span><span·class="p"·data-group-id="0782403435-10">}</span><span·class="p"·data-group-id="0782403435-5">]</span><span·class="p">,</span><span·class="w">
238 ····</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="1079418767-11">(</span><span·class="nf">filters</span><span·class="p"·data-group-id="1079418767-12">(</span><span·class="p"·data-group-id="1079418767-12">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">Optio[·...·truncated·by·diffoscope;·len:·158,·SHA:·b6a74785dcce1364ef69898ac5bed4fccc0ea7ccd6899ef753d0c0f542e65575·...·]-11">)</span><span·class="p">.</span></code></pre><p>A·simple·one-liner·starts·the·tool:</p><pre><code·class="text">··········erl·-pa·../examples·-s·et_demo</code></pre><p>The·filters·are·included·by·the·following·parameters:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">238 ····</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="0782403435-11">(</span><span·class="nf">filters</span><span·class="p"·data-group-id="0782403435-12">(</span><span·class="p"·data-group-id="0782403435-12">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">Optio[·...·truncated·by·diffoscope;·len:·158,·SHA:·572b294ad751ef11d573e10d1d73a8970a8ee14269ec494a1f0838a5badaaa85·...·]-11">)</span><span·class="p">.</span></code></pre><p>A·simple·one-liner·starts·the·tool:</p><pre><code·class="text">··········erl·-pa·../examples·-s·et_demo</code></pre><p>The·filters·are·included·by·the·following·parameters:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
239 </span><span·class="nf">filters</span><span·class="p"·data-group-id="6383110219-1">(</span><span·class="p"·data-group-id="6383110219-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">239 </span><span·class="nf">filters</span><span·class="p"·data-group-id="3835232652-1">(</span><span·class="p"·data-group-id="3835232652-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
240 ····</span><span·class="p"·data-group-id="6383110219-2">[</span><span·class="p"·data-group-id="6383110219-3">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6383110219-4">{</span><span·class="ss">filter</span><span·class="p"[·...·truncated·by·diffoscope;·len:·113,·SHA:·8dfdc75a974db139f91b0b17f9df40e96f6bd1de26e5a82289c52cea855c8079·...·]-4">}</span><span·class="p">,</span><span·class="w">240 ····</span><span·class="p"·data-group-id="3835232652-2">[</span><span·class="p"·data-group-id="3835232652-3">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3835232652-4">{</span><span·class="ss">filter</span><span·class="p"[·...·truncated·by·diffoscope;·len:·113,·SHA:·292c7b4ce3110bf395cb6bdbd7af7d955aef22c0b35f408b85f58bd0ffb94675·...·]-4">}</span><span·class="p">,</span><span·class="w">
241 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">module_as_actor</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6383110219-3">}</span><span·class="p">,</span><span·class="w">241 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">module_as_actor</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3835232652-3">}</span><span·class="p">,</span><span·class="w">
242 ·····</span><span·class="p"·data-group-id="6383110219-5">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6383110219-6">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pla[·...·truncated·by·diffoscope;·len:·63,·SHA:·2fad08c5ad433dec3c21f60d107be889509a0a4736b823587674d70808d6611b·...·]-6">}</span><span·class="p">,</span><span·class="w">242 ·····</span><span·class="p"·data-group-id="3835232652-5">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3835232652-6">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pla[·...·truncated·by·diffoscope;·len:·63,·SHA:·47641524f5cafd73adbf6de15cd4ac66795455bb42cc4e8cb69cfe4e80595f8d·...·]-6">}</span><span·class="p">,</span><span·class="w">
243 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">plain_process_info</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6383110219-5">}</span><span·class="p">,</span><span·class="w">243 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">plain_process_info</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3835232652-5">}</span><span·class="p">,</span><span·class="w">
244 ·····</span><span·class="p"·data-group-id="6383110219-7">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6383110219-8">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pla[·...·truncated·by·diffoscope;·len:·70,·SHA:·bee3a932936614bcb24483030853a67a50a4560cd584430c6144cfcaff14db4b·...·]-8">}</span><span·class="p">,</span><span·class="w">244 ·····</span><span·class="p"·data-group-id="3835232652-7">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3835232652-8">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pla[·...·truncated·by·diffoscope;·len:·70,·SHA:·98bc104c33a52a216225374128f7b59cc2da8b15d1fa2d716e7a7f3946d9338b·...·]-8">}</span><span·class="p">,</span><span·class="w">
245 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">plain_process_info_nolink</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6383110219-7">}</span><span·class="p">,</span><span·class="w">245 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">plain_process_info_nolink</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3835232652-7">}</span><span·class="p">,</span><span·class="w">
246 ·····</span><span·class="p"·data-group-id="6383110219-9">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6383110219-10">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">na[·...·truncated·by·diffoscope;·len:·64,·SHA:·284d8d4fd7a4385fde365c9de8167ed2bcae66086018789aea0ec25f282817fd·...·]-10">}</span><span·class="p">,</span><span·class="w">246 ·····</span><span·class="p"·data-group-id="3835232652-9">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3835232652-10">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">na[·...·truncated·by·diffoscope;·len:·64,·SHA:·8cd6931f520b0c58d80805602b5f4661e68d08daaa6e4b74d57c686cd2ad3949·...·]-10">}</span><span·class="p">,</span><span·class="w">
247 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">named_process_info</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6383110219-9">}</span><span·class="p">,</span><span·class="w">247 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">named_process_info</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3835232652-9">}</span><span·class="p">,</span><span·class="w">
248 ·····</span><span·class="p"·data-group-id="6383110219-11">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6383110219-12">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">n[·...·truncated·by·diffoscope;·len:·72,·SHA:·026143b1f7eadd028ceef00ab5b5885e8332d65616f1d6ea06f275849348c523·...·]-12">}</span><span·class="p">,</span><span·class="w">248 ·····</span><span·class="p"·data-group-id="3835232652-11">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3835232652-12">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">n[·...·truncated·by·diffoscope;·len:·72,·SHA:·cee668cef97bb62f2e1f0cf0768909b3842895f13da515bd5f4459d4882da3f7·...·]-12">}</span><span·class="p">,</span><span·class="w">
249 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">named_process_info_nolink</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6383110219-11">}</span><span·class="p">,</span><span·class="w">249 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">named_process_info_nolink</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3835232652-11">}</span><span·class="p">,</span><span·class="w">
250 ·····</span><span·class="p"·data-group-id="6383110219-13">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6383110219-14">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">n[·...·truncated·by·diffoscope;·len:·64,·SHA:·9203725cec654a97332c6316e55be58240158f1d0f5c8eb6164a9e56dfd6a2f6·...·]-14">}</span><span·class="p">,</span><span·class="w">250 ·····</span><span·class="p"·data-group-id="3835232652-13">{</span><span·class="ss">dict_insert</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3835232652-14">{</span><span·class="ss">filter</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">n[·...·truncated·by·diffoscope;·len:·64,·SHA:·c3e5dfcf8461f47e6ec77bbb6363d66e302f132fdba129289b546951387959b7·...·]-14">}</span><span·class="p">,</span><span·class="w">
251 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">node_process_info</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6383110219-13">}</span><span·class="p">,</span><span·class="w">251 ···················</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">node_process_info</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3835232652-13">}</span><span·class="p">,</span><span·class="w">
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213 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the213 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
214 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>214 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
215 ······</p>215 ······</p>
216 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>216 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
217 ····</footer>217 ····</footer>
218 ··</div>218 ··</div>
219 </main>219 </main>
220 </div>220 </div>
221 <script>221 <script>
222 ··function·mermaidLoaded()·{222 ··function·mermaidLoaded()·{
223 ····mermaid.initialize({223 ····mermaid.initialize({
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415 ······<p·class="built-using">415 ······<p·class="built-using">
416 ········Built·using416 ········Built·using
417 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the417 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
418 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>418 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
419 ······</p>419 ······</p>
420 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>420 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
421 ····</footer>421 ····</footer>
422 ··</div>422 ··</div>
423 </main>423 </main>
424 </div>424 </div>
425 <script>425 <script>
426 ··function·mermaidLoaded()·{426 ··function·mermaidLoaded()·{
427 ····mermaid.initialize({427 ····mermaid.initialize({
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129 ··<a·href="#visualizing-message-sequence-charts"·class="hover-link">129 ··<a·href="#visualizing-message-sequence-charts"·class="hover-link">
130 ····<i·class="ri-link-m"·aria-hidden="true"></i>130 ····<i·class="ri-link-m"·aria-hidden="true"></i>
131 ··</a>131 ··</a>
132 ··<span·class="text">Visualizing·Message·Sequence·Charts</span>132 ··<span·class="text">Visualizing·Message·Sequence·Charts</span>
133 </h2>133 </h2>
134 <p>The·easiest·way·of·using·<code·class="inline">ET</code>,·is·to·just·use·it·as·a·graphical·tool·for134 <p>The·easiest·way·of·using·<code·class="inline">ET</code>,·is·to·just·use·it·as·a·graphical·tool·for
135 displaying·message·sequence·charts.·In·order·to·do·that·you·need·to·first·start135 displaying·message·sequence·charts.·In·order·to·do·that·you·need·to·first·start
136 a·<code·class="inline">Viewer</code>·(which·by·default·starts·a·<code·class="inline">Collector</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="3453587432-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ViewerPid</span><span·class="p"·data-group-id="3453587432-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·488,·SHA:·56c6be2c4620743757b5f13ab345853222f803df914b764b6eb3fce0520bf85d·...·]-2">)</span><span·class="p">,</span><span·class="w">136 a·<code·class="inline">Viewer</code>·(which·by·default·starts·a·<code·class="inline">Collector</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="3958296421-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ViewerPid</span><span·class="p"·data-group-id="3958296421-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·488,·SHA:·d2cb21fcffae3321b481aea5490bcb0c22f8fcd046625be4b8dacbf09d95c364·...·]-2">)</span><span·class="p">,</span><span·class="w">
137 ······</span><span·class="n">CollectorPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="3453587432-5">(</span><span·class="n">ViewerPid</span><span·class="p"·data-group-id="3453587432-5">)</span><span·class="p">.</span></code></pre><p><a·href=""·id="report_event"></a></p><p>Then·you·send·events·to·the·<code·class="inline">Collector</code>·with·the·function137 ······</span><span·class="n">CollectorPid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="3958296421-5">(</span><span·class="n">ViewerPid</span><span·class="p"·data-group-id="3958296421-5">)</span><span·class="p">.</span></code></pre><p><a·href=""·id="report_event"></a></p><p>Then·you·send·events·to·the·<code·class="inline">Collector</code>·with·the·function
138 <a·href="et_collector.html#report_event/6"><code·class="inline">et_collector:report_event/6</code></a>·like·this:</p><pre><code·class="text">······et_collector:report_event(CollectorPid,85,from,to,message,extra_stuff).</code></pre><p>The·<code·class="inline">Viewer</code>·will·automatically·pull·events·from·the·<code·class="inline">Collector</code>·and·display138 <a·href="et_collector.html#report_event/6"><code·class="inline">et_collector:report_event/6</code></a>·like·this:</p><pre><code·class="text">······et_collector:report_event(CollectorPid,85,from,to,message,extra_stuff).</code></pre><p>The·<code·class="inline">Viewer</code>·will·automatically·pull·events·from·the·<code·class="inline">Collector</code>·and·display
139 them·on·the·screen.</p><p>The·number·(in·this·case·85)·is·an·integer·from·1·to·100·that·specifies·the139 them·on·the·screen.</p><p>The·number·(in·this·case·85)·is·an·integer·from·1·to·100·that·specifies·the
140 &quot;detail·level&quot;·of·the·message.·The·higher·the·number,·the·more·important·it·is.140 &quot;detail·level&quot;·of·the·message.·The·higher·the·number,·the·more·important·it·is.
141 This·provides·a·crude·form·of·priority·filtering.</p><p>The·<code·class="inline">from</code>,·<code·class="inline">to</code>,·and·<code·class="inline">message</code>·parameters·are·exactly·what·they·sound·like.141 This·provides·a·crude·form·of·priority·filtering.</p><p>The·<code·class="inline">from</code>,·<code·class="inline">to</code>,·and·<code·class="inline">message</code>·parameters·are·exactly·what·they·sound·like.
142 <code·class="inline">from</code>·and·<code·class="inline">to</code>·are·visualized·in·the·<code·class="inline">Viewer</code>·as·&quot;lifelines&quot;,·with·the·message142 <code·class="inline">from</code>·and·<code·class="inline">to</code>·are·visualized·in·the·<code·class="inline">Viewer</code>·as·&quot;lifelines&quot;,·with·the·message
143 passing·from·one·to·the·other.·If·<code·class="inline">from</code>·and·<code·class="inline">to</code>·are·the·same·value,·then·it·is143 passing·from·one·to·the·other.·If·<code·class="inline">from</code>·and·<code·class="inline">to</code>·are·the·same·value,·then·it·is
144 displayed·next·to·the·lifeline·as·an·&quot;action&quot;.·The·<code·class="inline">extra_stuff</code>value·is·simply144 displayed·next·to·the·lifeline·as·an·&quot;action&quot;.·The·<code·class="inline">extra_stuff</code>value·is·simply
145 data·that·you·can·attach·that·will·be·displayed·when·someone·actually·clicks·on145 data·that·you·can·attach·that·will·be·displayed·when·someone·actually·clicks·on
146 the·action·or·message·in·the·<code·class="inline">Viewer</code>·window.</p><p>The·module·<code·class="inline">et/examples/et_display_demo.erl</code>·illustrates·how·it·can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">146 the·action·or·message·in·the·<code·class="inline">Viewer</code>·window.</p><p>The·module·<code·class="inline">et/examples/et_display_demo.erl</code>·illustrates·how·it·can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
147 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9139792919-1">(</span><span·class="ss">et_display_demo</span><span·class="p"·data-group-id="9139792919-1">)</span><span·class="p">.</span><span·class="w">147 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1012952399-1">(</span><span·class="ss">et_display_demo</span><span·class="p"·data-group-id="1012952399-1">)</span><span·class="p">.</span><span·class="w">
148 </span><span·class="w">148 </span><span·class="w">
149 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9139792919-2">(</span><span·class="p"·data-group-id="9139792919-3">[</span><span·class="ss">test</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="9139792919-3">]</span><span·class="p"·data-group-id="9139792919-2">)</span><span·class="p">.</span><span·class="w">149 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1012952399-2">(</span><span·class="p"·data-group-id="1012952399-3">[</span><span·class="ss">test</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="1012952399-3">]</span><span·class="p"·data-group-id="1012952399-2">)</span><span·class="p">.</span><span·class="w">
  
150 </span><span·class="nf">test</span><span·class="p"·data-group-id="9139792919-4">(</span><span·class="p"·data-group-id="9139792919-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">150 </span><span·class="nf">test</span><span·class="p"·data-group-id="1012952399-4">(</span><span·class="p"·data-group-id="1012952399-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
151 ····</span><span·class="p"·data-group-id="9139792919-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="9139792919-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·723,·SHA:·6fd96993a78b6da9da68289bbb3ea3acc72d00fdc1aa0025db4b21100be68001·...·]9-6">)</span><span·class="p">,</span><span·class="w">151 ····</span><span·class="p"·data-group-id="1012952399-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Viewer</span><span·class="p"·data-group-id="1012952399-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·723,·SHA:·7ff0b4e22d5a54fae5c10d5c8bf2cad4e8085dda6152ca5661831a280aeaa3ab·...·]9-6">)</span><span·class="p">,</span><span·class="w">
152 ····</span><span·class="n">Drink</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9139792919-10">{</span><span·class="ss">drink</span><span·class="p">,</span><span·class="ss">iced_chai_latte</span><span·class="p"·data-group-id="9139792919-10">}</span><span·class="p">,</span><span·class="w">152 ····</span><span·class="n">Drink</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1012952399-10">{</span><span·class="ss">drink</span><span·class="p">,</span><span·class="ss">iced_chai_latte</span><span·class="p"·data-group-id="1012952399-10">}</span><span·class="p">,</span><span·class="w">
153 ····</span><span·class="n">Size</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9139792919-11">{</span><span·class="nb">size</span><span·class="p">,</span><span·class="ss">grande</span><span·class="p"·data-group-id="9139792919-11">}</span><span·class="p">,</span><span·class="w">153 ····</span><span·class="n">Size</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1012952399-11">{</span><span·class="nb">size</span><span·class="p">,</span><span·class="ss">grande</span><span·class="p"·data-group-id="1012952399-11">}</span><span·class="p">,</span><span·class="w">
154 ····</span><span·class="n">Milk</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9139792919-12">{</span><span·class="ss">milk</span><span·class="p">,</span><span·class="ss">whole</span><span·class="p"·data-group-id="9139792919-12">}</span><span·class="p">,</span><span·class="w">154 ····</span><span·class="n">Milk</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1012952399-12">{</span><span·class="ss">milk</span><span·class="p">,</span><span·class="ss">whole</span><span·class="p"·data-group-id="1012952399-12">}</span><span·class="p">,</span><span·class="w">
155 ····</span><span·class="n">Flavor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9139792919-13">{</span><span·class="ss">flavor</span><span·class="p">,</span><span·class="ss">vanilla</span><span·class="p"·data-group-id="9139792919-13">}</span><span·class="p">,</span><span·class="w">155 ····</span><span·class="n">Flavor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1012952399-13">{</span><span·class="ss">flavor</span><span·class="p">,</span><span·class="ss">vanilla</span><span·class="p"·data-group-id="1012952399-13">}</span><span·class="p">,</span><span·class="w">
156 ····</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="9139792919-14">(</span><span·class="n">Viewer</span><span·class="p"·data-group-id="9139792919-14">)</span><span·class="p">,</span><span·class="w">156 ····</span><span·class="n">C</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">get_collector_pid</span><span·class="p"·data-group-id="1012952399-14">(</span><span·class="n">Viewer</span><span·class="p"·data-group-id="1012952399-14">)</span><span·class="p">,</span><span·class="w">
157 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-15">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">99</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">place[·...·truncated·by·diffoscope;·len:·368,·SHA:·862d3937e4c62ae0210ff1ec8d860a4101bf4eb741fe916f329c1296a5c9ae21·...·]9-15">)</span><span·class="p">,</span><span·class="w">157 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-15">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">99</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">place[·...·truncated·by·diffoscope;·len:·368,·SHA:·52de90a9545652931419911c16b3d3bc61778edaae1991214a430a7ccfa7aa6f·...·]9-15">)</span><span·class="p">,</span><span·class="w">
158 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-17">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">enter[·...·truncated·by·diffoscope;·len:·317,·SHA:·2bc3813518d6cfef07f2bd7e275b9d63aa598fa1e3961c5a371f9c8c4167d486·...·]9-17">)</span><span·class="p">,</span><span·class="w">158 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-17">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">enter[·...·truncated·by·diffoscope;·len:·317,·SHA:·7f5a8fd29f038e8e1aa8695f99d533e6baa62f763b57766315c11b039647f568·...·]9-17">)</span><span·class="p">,</span><span·class="w">
159 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-19">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">give_[·...·truncated·by·diffoscope;·len:·113,·SHA:·acc9ef05c791b0bda6f7c5c1c197e2c1cf5cfd755bad375ee1b737b7e5cb1846·...·]9-19">)</span><span·class="p">,</span><span·class="w">159 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-19">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">give_[·...·truncated·by·diffoscope;·len:·113,·SHA:·a1ad32acb12714d1040e09521dab60e20fee6efca58d45953d51075e8e63a29c·...·]9-19">)</span><span·class="p">,</span><span·class="w">
160 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-20">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">get_[·...·truncated·by·diffoscope;·len:·261,·SHA:·b2132903741d26eaca7dce375a1e6a3f3c623862e1605c70a200a26004411db7·...·]9-20">)</span><span·class="p">,</span><span·class="w">160 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-20">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">get_[·...·truncated·by·diffoscope;·len:·261,·SHA:·6d1d3289a6f566f24b727b3c7390e0c9779d5bcdb075be2a4828794be91173c4·...·]9-20">)</span><span·class="p">,</span><span·class="w">
161 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-22">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">give[·...·truncated·by·diffoscope;·len:·183,·SHA:·3b6481492af81c4c3f2a63ae6cf3133a970ed26e56d462bbe5c2370587eda490·...·]9-22">)</span><span·class="p">,</span><span·class="w">161 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-22">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">give[·...·truncated·by·diffoscope;·len:·183,·SHA:·026cf12bd07fd559c67cbd1472d113388d27f083399b2bda606b089a715c2b3e·...·]9-22">)</span><span·class="p">,</span><span·class="w">
162 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-24">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">reque[·...·truncated·by·diffoscope;·len:·116,·SHA:·1d4a57fd1895a635f45add553794dc58fc6f9c488b4395889e5b3c980a66fcfb·...·]9-24">)</span><span·class="p">,</span><span·class="w">162 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-24">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">reque[·...·truncated·by·diffoscope;·len:·116,·SHA:·7b2e23d6d2adeb3bb3cc9e3708eaf31f5c67db8cc51f0b1b2618487746a90eea·...·]9-24">)</span><span·class="p">,</span><span·class="w">
163 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-25">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">pay_m[·...·truncated·by·diffoscope;·len:·112,·SHA:·eb29f9d2f4b1cc378f0a354deca31a0cd3ae1c06fa0a6cab76e84ba5201a06be·...·]9-25">)</span><span·class="p">,</span><span·class="w">163 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-25">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">pay_m[·...·truncated·by·diffoscope;·len:·112,·SHA:·70398ffc9d90c48b7b14b95576fe108ae9fd478dcf67803ba0213aea8c3ff8ce·...·]9-25">)</span><span·class="p">,</span><span·class="w">
164 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-26">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">get_[·...·truncated·by·diffoscope;·len:·187,·SHA:·9d88c0877873e29b1d5a546e08ca4eb6d81b6379ab24a8762d710c59ba57f540·...·]9-26">)</span><span·class="p">,</span><span·class="w">164 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-26">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">get_[·...·truncated·by·diffoscope;·len:·187,·SHA:·5aa1ab1b9c6531532622610f3ded6bdee4cf72ad6da34c2fc9b622895d404ccc·...·]9-26">)</span><span·class="p">,</span><span·class="w">
165 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-28">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_[·...·truncated·by·diffoscope;·len:·214,·SHA:·480644960571f90e6b05af7109cc269bff54c9e5a595acc08a99d0b9355d8fbe·...·]9-28">)</span><span·class="p">,</span><span·class="w">165 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-28">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_[·...·truncated·by·diffoscope;·len:·214,·SHA:·b48665972b55ad6af8e43e316fdd4825a309a3ceff8a8f48f2a4b6cdb38c8c1c·...·]9-28">)</span><span·class="p">,</span><span·class="w">
166 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-30">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_[·...·truncated·by·diffoscope;·len:·210,·SHA:·90d0503b9c5bef66003ecbf80f3852264a9c46582e57b206f8e06598d7171305·...·]9-30">)</span><span·class="p">,</span><span·class="w">166 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-30">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_[·...·truncated·by·diffoscope;·len:·210,·SHA:·982d914f838f627c5a2efa2b9c0b1e3eea1cbf2174ebd8137c5c764fa51bf5b5·...·]9-30">)</span><span·class="p">,</span><span·class="w">
167 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-32">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_[·...·truncated·by·diffoscope;·len:·182,·SHA:·ffb8d02d6a77a0bdefba1e59611b85404825d510041cc0d157c2f4f71eea6bb4·...·]9-32">)</span><span·class="p">,</span><span·class="w">167 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-32">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_[·...·truncated·by·diffoscope;·len:·182,·SHA:·3038fbc83a2290d5d8c88744a8c66fd9c36258c13b27d07685c026405f45cbf7·...·]9-32">)</span><span·class="p">,</span><span·class="w">
168 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-34">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">swir[·...·truncated·by·diffoscope;·len:·180,·SHA:·43d2e783e480643a8cd34e8ef4044acfc6e4dfab26de438060ee44d69fb0858f·...·]9-34">)</span><span·class="p">,</span><span·class="w">168 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-34">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">swir[·...·truncated·by·diffoscope;·len:·180,·SHA:·144919ad20ee2c5ddfca368351c4ce1e35c367caae34cf72ee0d6fc01090b8e9·...·]9-34">)</span><span·class="p">,</span><span·class="w">
169 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="9139792919-36">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">give_[·...·truncated·by·diffoscope;·len:·272,·SHA:·89f616a38f0868cccdc63b3f11a9299602f97f8b528fea906b657663f84af4eb·...·]9-36">)</span><span·class="p">,</span><span·class="w">169 ····</span><span·class="nc">et_collector</span><span·class="p">:</span><span·class="nf">report_event</span><span·class="p"·data-group-id="1012952399-36">(</span><span·class="n">C</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">give_[·...·truncated·by·diffoscope;·len:·272,·SHA:·e394d4892608551f34f77e4464f7302ff14f84bc7a10b6766918df03cc17bc10·...·]9-36">)</span><span·class="p">,</span><span·class="w">
170 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>When·you·run·the·<code·class="inline">et_display_demo:test().</code>·function·in·the·example·above,·the170 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>When·you·run·the·<code·class="inline">et_display_demo:test().</code>·function·in·the·example·above,·the
171 <code·class="inline">Viewer</code>·window·will·look·like·this:</p><p><img·src="assets/coffee_order.png"·alt="Screenshot·of·the·Viewer·window"·title="Screenshot·of·the·Viewer·window"/></p><h2·id="four-modules"·class="section-heading">171 <code·class="inline">Viewer</code>·window·will·look·like·this:</p><p><img·src="assets/coffee_order.png"·alt="Screenshot·of·the·Viewer·window"·title="Screenshot·of·the·Viewer·window"/></p><h2·id="four-modules"·class="section-heading">
172 ··<a·href="#four-modules"·class="hover-link">172 ··<a·href="#four-modules"·class="hover-link">
173 ····<i·class="ri-link-m"·aria-hidden="true"></i>173 ····<i·class="ri-link-m"·aria-hidden="true"></i>
174 ··</a>174 ··</a>
175 ··<span·class="text">Four·Modules</span>175 ··<span·class="text">Four·Modules</span>
176 </h2>176 </h2>
Offset 195, 15 lines modifiedOffset 195, 15 lines modified
195 <code·class="inline">Tracer</code>·of·the·<code·class="inline">Raw·Trace·Data</code>.</p><p>Erlang·tracing·is·a·seething·pile·of·pain·that·involves·reasonably·complex195 <code·class="inline">Tracer</code>·of·the·<code·class="inline">Raw·Trace·Data</code>.</p><p>Erlang·tracing·is·a·seething·pile·of·pain·that·involves·reasonably·complex
196 knowledge·of·clever·ports,·tracing·return·formats,·and·specialized·tracing196 knowledge·of·clever·ports,·tracing·return·formats,·and·specialized·tracing
197 <code·class="inline">MatchSpecs</code>·(which·are·really·their·own·special·kind·of·hell).·The·tracing197 <code·class="inline">MatchSpecs</code>·(which·are·really·their·own·special·kind·of·hell).·The·tracing
198 mechanism·is·very·powerful·indeed,·but·it·can·be·hard·to·grasp.</p><p>Luckily·there·is·a·simplified·way·to·start·tracing·of·<a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·function198 mechanism·is·very·powerful·indeed,·but·it·can·be·hard·to·grasp.</p><p>Luckily·there·is·a·simplified·way·to·start·tracing·of·<a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·function
199 calls.·The·idea·is·that·you·should·instrument·your·code·with·calls·to199 calls.·The·idea·is·that·you·should·instrument·your·code·with·calls·to
200 <a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·in·strategic·places·where·you·have·interesting·information200 <a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·in·strategic·places·where·you·have·interesting·information
201 available·in·your·program.·Then·you·just·start·the·<code·class="inline">Collector</code>·with·global201 available·in·your·program.·Then·you·just·start·the·<code·class="inline">Collector</code>·with·global
202 tracing·enabled:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9734331983-1">(</span><span·class="p"·data-group-id="9734331983-2">[</span><span·class="p"·data-group-id="9734331983-3">{</span><span·class="ss">trace_global</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·553,·SHA:·f103e0a901842c329ec80217f6faaada35860e1ea0adad2373b2417cea1bf4a0·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·will·start·a·<code·class="inline">Collector</code>,·a·<code·class="inline">Viewer</code>·and·also·start·the·tracing·of202 tracing·enabled:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="0083944521-1">(</span><span·class="p"·data-group-id="0083944521-2">[</span><span·class="p"·data-group-id="0083944521-3">{</span><span·class="ss">trace_global</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·553,·SHA:·9c5ad7d661abeb02d2e6e3e96dca0b2d29d807dc32350a931600af41d5d2e27b·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·will·start·a·<code·class="inline">Collector</code>,·a·<code·class="inline">Viewer</code>·and·also·start·the·tracing·of
203 <a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·function·calls.·The·<code·class="inline">Raw·Trace·Data</code>·is·collected·by·the203 <a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·function·calls.·The·<code·class="inline">Raw·Trace·Data</code>·is·collected·by·the
204 <code·class="inline">Collector</code>·and·a·view·of·it·is·displayed·on·the·screen·by·the·<code·class="inline">Viewer</code>.·You·can204 <code·class="inline">Collector</code>·and·a·view·of·it·is·displayed·on·the·screen·by·the·<code·class="inline">Viewer</code>.·You·can
205 define·your·own·&quot;views&quot;·of·the·data·by·implementing·your·own·<code·class="inline">Filter</code>·functions205 define·your·own·&quot;views&quot;·of·the·data·by·implementing·your·own·<code·class="inline">Filter</code>·functions
206 and·register·them·in·the·<code·class="inline">Viewer</code>.</p><h2·id="the-collector-and-viewer"·class="section-heading">206 and·register·them·in·the·<code·class="inline">Viewer</code>.</p><h2·id="the-collector-and-viewer"·class="section-heading">
207 ··<a·href="#the-collector-and-viewer"·class="hover-link">207 ··<a·href="#the-collector-and-viewer"·class="hover-link">
208 ····<i·class="ri-link-m"·aria-hidden="true"></i>208 ····<i·class="ri-link-m"·aria-hidden="true"></i>
209 ··</a>209 ··</a>
Offset 251, 44 lines modifiedOffset 251, 44 lines modified
251 ··</a>251 ··</a>
252 ··<span·class="text">How·To·Put·It·Together</span>252 ··<span·class="text">How·To·Put·It·Together</span>
253 </h2>253 </h2>
254 <p>The·<code·class="inline">Collector</code>·automatically·registers·itself·to·listen·for·trace·<code·class="inline">Events</code>,·so254 <p>The·<code·class="inline">Collector</code>·automatically·registers·itself·to·listen·for·trace·<code·class="inline">Events</code>,·so
255 all·you·have·to·do·is·enable·them.</p><p>For·those·people·who·want·to·do·general·tracing,·consult·the·<code·class="inline">dbg</code>·module·on·how255 all·you·have·to·do·is·enable·them.</p><p>For·those·people·who·want·to·do·general·tracing,·consult·the·<code·class="inline">dbg</code>·module·on·how
256 to·trace·whatever·you're·interested·in·and·let·it·work·its·magic.·If·you·just256 to·trace·whatever·you're·interested·in·and·let·it·work·its·magic.·If·you·just
257 want·<a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·to·work,·do·the·following:</p><ol><li>Create·a·<code·class="inline">Collector</code></li><li>Create·a·<code·class="inline">Viewer</code>·(this·can·do·step·#1·for·you)</li><li>Turn·on·and·pare·down·debugging</li></ol><p>The·module·<code·class="inline">et/examples/et_trace_demo.erl</code>·achieves·this.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">257 want·<a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·to·work,·do·the·following:</p><ol><li>Create·a·<code·class="inline">Collector</code></li><li>Create·a·<code·class="inline">Viewer</code>·(this·can·do·step·#1·for·you)</li><li>Turn·on·and·pare·down·debugging</li></ol><p>The·module·<code·class="inline">et/examples/et_trace_demo.erl</code>·achieves·this.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">
258 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7406334676-1">(</span><span·class="ss">et_trace_demo</span><span·class="p"·data-group-id="7406334676-1">)</span><span·class="p">.</span><span·class="w">258 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2267588838-1">(</span><span·class="ss">et_trace_demo</span><span·class="p"·data-group-id="2267588838-1">)</span><span·class="p">.</span><span·class="w">
259 </span><span·class="w">259 </span><span·class="w">
260 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7406334676-2">(</span><span·class="p"·data-group-id="7406334676-3">[</span><span·class="ss">test</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="7406334676-3">]</span><span·class="p"·data-group-id="7406334676-2">)</span><span·class="p">.</span><span·class="w">260 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2267588838-2">(</span><span·class="p"·data-group-id="2267588838-3">[</span><span·class="ss">test</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2267588838-3">]</span><span·class="p"·data-group-id="2267588838-2">)</span><span·class="p">.</span><span·class="w">
  
261 </span><span·class="nf">test</span><span·class="p"·data-group-id="7406334676-4">(</span><span·class="p"·data-group-id="7406334676-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">261 </span><span·class="nf">test</span><span·class="p"·data-group-id="2267588838-4">(</span><span·class="p"·data-group-id="2267588838-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
262 ····</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="7406334676-5">(</span><span·class="p"·data-group-id="7406334676-6">[</span><span·class="w">262 ····</span><span·class="nc">et_viewer</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2267588838-5">(</span><span·class="p"·data-group-id="2267588838-6">[</span><span·class="w">
263 ········</span><span·class="p"·data-group-id="7406334676-7">{</span><span·class="ss">title</span><span·class="p">,</span><span·class="s">&quot;Coffee·Order&quot;</span><span·class="p"·data-group-id="7406334676-7">}</span><span·class="p">,</span><span·class="w">263 ········</span><span·class="p"·data-group-id="2267588838-7">{</span><span·class="ss">title</span><span·class="p">,</span><span·class="s">&quot;Coffee·Order&quot;</span><span·class="p"·data-group-id="2267588838-7">}</span><span·class="p">,</span><span·class="w">
264 ········</span><span·class="p"·data-group-id="7406334676-8">{</span><span·class="ss">trace_global</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="7406334676-8">}</span><span·class="p">,</span><span·class="w">264 ········</span><span·class="p"·data-group-id="2267588838-8">{</span><span·class="ss">trace_global</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="2267588838-8">}</span><span·class="p">,</span><span·class="w">
265 ········</span><span·class="p"·data-group-id="7406334676-9">{</span><span·class="nb">trace_pattern</span><span·class="p">,</span><span·class="p"·data-group-id="7406334676-10">{</span><span·class="ss">et</span><span·class="p">,</span><span·class="ss">max</span><span·class="p"·data-group-id="7406334676-[·...·truncated·by·diffoscope;·len:·53,·SHA:·cb778b2c686ac4ea287b0c15574e0760cd30b0c9243eadfce9b0d907f76c5e2e·...·]-9">}</span><span·class="p">,</span><span·class="w">265 ········</span><span·class="p"·data-group-id="2267588838-9">{</span><span·class="nb">trace_pattern</span><span·class="p">,</span><span·class="p"·data-group-id="2267588838-10">{</span><span·class="ss">et</span><span·class="p">,</span><span·class="ss">max</span><span·class="p"·data-group-id="2267588838-[·...·truncated·by·diffoscope;·len:·53,·SHA:·a238816c4d32ab100fbe1b409755785997826a1790fbf685c60416b2ec38e75c·...·]-9">}</span><span·class="p">,</span><span·class="w">
266 ········</span><span·class="p"·data-group-id="7406334676-11">{</span><span·class="ss">max_actors</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="7406334676-11">}</span><span·class="w">266 ········</span><span·class="p"·data-group-id="2267588838-11">{</span><span·class="ss">max_actors</span><span·class="p">,</span><span·class="mi">10</span><span·class="p"·data-group-id="2267588838-11">}</span><span·class="w">
267 ······</span><span·class="p"·data-group-id="7406334676-6">]</span><span·class="p"·data-group-id="7406334676-5">)</span><span·class="p">,</span><span·class="w">267 ······</span><span·class="p"·data-group-id="2267588838-6">]</span><span·class="p"·data-group-id="2267588838-5">)</span><span·class="p">,</span><span·class="w">
268 ······</span><span·class="c1">%%·dbg:p(all,call),</span><span·class="w">268 ······</span><span·class="c1">%%·dbg:p(all,call),</span><span·class="w">
269 ······</span><span·class="c1">%%·dbg:tpl(et,·trace_me,·5,·[]),</span><span·class="w">269 ······</span><span·class="c1">%%·dbg:tpl(et,·trace_me,·5,·[]),</span><span·class="w">
270 ······</span><span·class="n">Drink</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7406334676-12">{</span><span·class="ss">drink</span><span·class="p">,</span><span·class="ss">iced_chai_latte</span><span·class="p"·data-group-id="7406334676-12">}</span><span·class="p">,</span><span·class="w">270 ······</span><span·class="n">Drink</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2267588838-12">{</span><span·class="ss">drink</span><span·class="p">,</span><span·class="ss">iced_chai_latte</span><span·class="p"·data-group-id="2267588838-12">}</span><span·class="p">,</span><span·class="w">
271 ······</span><span·class="n">Size</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7406334676-13">{</span><span·class="nb">size</span><span·class="p">,</span><span·class="ss">grande</span><span·class="p"·data-group-id="7406334676-13">}</span><span·class="p">,</span><span·class="w">271 ······</span><span·class="n">Size</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2267588838-13">{</span><span·class="nb">size</span><span·class="p">,</span><span·class="ss">grande</span><span·class="p"·data-group-id="2267588838-13">}</span><span·class="p">,</span><span·class="w">
272 ······</span><span·class="n">Milk</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7406334676-14">{</span><span·class="ss">milk</span><span·class="p">,</span><span·class="ss">whole</span><span·class="p"·data-group-id="7406334676-14">}</span><span·class="p">,</span><span·class="w">272 ······</span><span·class="n">Milk</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2267588838-14">{</span><span·class="ss">milk</span><span·class="p">,</span><span·class="ss">whole</span><span·class="p"·data-group-id="2267588838-14">}</span><span·class="p">,</span><span·class="w">
273 ······</span><span·class="n">Flavor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7406334676-15">{</span><span·class="ss">flavor</span><span·class="p">,</span><span·class="ss">vanilla</span><span·class="p"·data-group-id="7406334676-15">}</span><span·class="p">,</span><span·class="w">273 ······</span><span·class="n">Flavor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2267588838-15">{</span><span·class="ss">flavor</span><span·class="p">,</span><span·class="ss">vanilla</span><span·class="p"·data-group-id="2267588838-15">}</span><span·class="p">,</span><span·class="w">
274 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-16">(</span><span·class="mi">99</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">place_order</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·321,·SHA:·488b3b85ca3e398be1db7e5843e84dfae916f60ca6dda761f444961b6b245a5a·...·]-16">)</span><span·class="p">,</span><span·class="w">274 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-16">(</span><span·class="mi">99</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">place_order</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·321,·SHA:·fa073898824dd4aeee22c0954d74e2cf540444a654e0b324e2bb6d60ff8f949b·...·]-16">)</span><span·class="p">,</span><span·class="w">
275 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-18">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">enter_order</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·270,·SHA:·5255e440b2c81cd3d6aa3bd5c0b5717ca8fbdec4ea565c633d585b94975f2fbe·...·]-18">)</span><span·class="p">,</span><span·class="w">275 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-18">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">enter_order</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·270,·SHA:·8ae236a06c8f6f054eaf88801952cf8fe5cf9c38e11365e263452398adc8e669·...·]-18">)</span><span·class="p">,</span><span·class="w">
276 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-20">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">give_total</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·66,·SHA:·7fa4fb963336bff4e9c6298805a2b95ad099a5b2b18c68f8ea4a70c7a5ab0779·...·]-20">)</span><span·class="p">,</span><span·class="w">276 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-20">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="nb">register</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">give_total</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·66,·SHA:·6c9d7bcee676f05098be086aa965ecb9e05e426884fcd2228ff2f4096dad3d68·...·]-20">)</span><span·class="p">,</span><span·class="w">
277 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-21">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">get_cup</span><span·class="p">,</span><span·class="p[·...·truncated·by·diffoscope;·len:·214,·SHA:·c0cac912a97703dfd84fa9a6a3a293f3c272ea9bd90df533840c97f52c4415eb·...·]-21">)</span><span·class="p">,</span><span·class="w">277 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-21">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">get_cup</span><span·class="p">,</span><span·class="p[·...·truncated·by·diffoscope;·len:·214,·SHA:·cb02a52ab4bd893fe1ac0ed84f5aebfccd8305fbecbfdebb9b8415f68f14fcb9·...·]-21">)</span><span·class="p">,</span><span·class="w">
278 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-23">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">give_cup</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·136,·SHA:·125602c922fda80a7e7ba5abb3d2b7f6dab2cc463938835b76f209aaf0413f2f·...·]-23">)</span><span·class="p">,</span><span·class="w">278 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-23">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">give_cup</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·136,·SHA:·2b52bf79a653da8c637774cbe49446015be6a85539c2998fe06ff74ed2277ee9·...·]-23">)</span><span·class="p">,</span><span·class="w">
279 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-25">(</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">request_money</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·69,·SHA:·b096a3c8bd3c13e717b65dc567bcbe34aaffcc6dafc8fd496e863a556da4b170·...·]-25">)</span><span·class="p">,</span><span·class="w">279 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-25">(</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">request_money</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·69,·SHA:·b1395e9268d0a994727c4b4391232c9d0b4f3444ab61170f71861948a9fbde72·...·]-25">)</span><span·class="p">,</span><span·class="w">
280 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-26">(</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">pay_money</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·65,·SHA:·42a49bd48092d7296cf7ece95e521c86547c2e7ffbbb1206621a41968ecc263f·...·]-26">)</span><span·class="p">,</span><span·class="w">280 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-26">(</span><span·class="mi">90</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">barrista1</span><span·class="p">,</span><span·class="ss">pay_money</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·65,·SHA:·781b5c5593a1628b04869bf5c2577acfcfaa372fd8f5c6bbf7db7a6858b06483·...·]-26">)</span><span·class="p">,</span><span·class="w">
281 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-27">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">get_chai_mix</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·140,·SHA:·e763b3a90d60c407e3607f31f2f7301634c09a8480daad36dfac8cd9684df07d·...·]-27">)</span><span·class="p">,</span><span·class="w">281 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-27">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">get_chai_mix</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·140,·SHA:·298c2a525325e810ac3a6f35553539fe530d0cc16e7241ca7c0c6d802bdb746c·...·]-27">)</span><span·class="p">,</span><span·class="w">
282 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-29">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_flavor</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·167,·SHA:·e081646b311416e50f6dab0d974291086d3262640863eb27a55f545b53d63341·...·]-29">)</span><span·class="p">,</span><span·class="w">282 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-29">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_flavor</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·167,·SHA:·eab11f992887ba812c352240960015e5699188aa96785adbe25f6cec50f1b800·...·]-29">)</span><span·class="p">,</span><span·class="w">
283 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-31">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_milk</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·163,·SHA:·11db015d85cd4fa5bdded07ba0fa04b741a1fec84cf092c06fecf4bd07734431·...·]-31">)</span><span·class="p">,</span><span·class="w">283 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-31">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_milk</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·163,·SHA:·712b673ed4a90329db3dd3c54be2b4268c848a0b5eaa40428d1694f82416e139·...·]-31">)</span><span·class="p">,</span><span·class="w">
284 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-33">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_ice</span><span·class="p">,</span><span·class="p[·...·truncated·by·diffoscope;·len:·135,·SHA:·c90b46437d294d128f9f08f55a0781cf945cb8f62fff6b5c909498db42cb63a0·...·]-33">)</span><span·class="p">,</span><span·class="w">284 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-33">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">add_ice</span><span·class="p">,</span><span·class="p[·...·truncated·by·diffoscope;·len:·135,·SHA:·a421c373e635ef94a2f9481649dc51745f95ffb0f3422f4dd2eb4096ff2520ca·...·]-33">)</span><span·class="p">,</span><span·class="w">
285 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-35">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">swirl</span><span·class="p">,</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·133,·SHA:·8d0ad18f589892461b47be26e2cf3f040554c04f2a6fd907252d26291762a8c7·...·]-35">)</span><span·class="p">,</span><span·class="w">285 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-35">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">swirl</span><span·class="p">,</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·133,·SHA:·62fab7993bdf9a4e8572ed27b94081277cf28b3d8a3c91becadc0a5ec13136f5·...·]-35">)</span><span·class="p">,</span><span·class="w">
286 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="7406334676-37">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">give_tasty_beverage</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·225,·SHA:·cb402e51f83ce6bcac7bc64e3d7503280bf869d0043c0841660393181d0d1ca0·...·]-37">)</span><span·class="p">,</span><span·class="w">286 ······</span><span·class="nc">et</span><span·class="p">:</span><span·class="nf">trace_me</span><span·class="p"·data-group-id="2267588838-37">(</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">barrista2</span><span·class="p">,</span><span·class="ss">customer</span><span·class="p">,</span><span·class="ss">give_tasty_beverage</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·225,·SHA:·9b4a4f73c0c9e0f0eb4780d05e2596dabf0f00e6e38ca95860b7b0016b0ff7e2·...·]-37">)</span><span·class="p">,</span><span·class="w">
287 ······</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>Running·through·the·above,·the·most·important·points·are:</p><ul><li>Turn·on·global·tracing</li><li>Set·a·<code·class="inline">Trace·Pattern</code></li><li>Tell·<code·class="inline">dbg</code>·to·trace·function·Calls</li><li>Tell·it·specifically·to·trace·the·<a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·function</li></ul><p>When·you·run·the·<code·class="inline">et_trace_demo:test()</code>·function·above,·the·<code·class="inline">Viewer</code>·window·will287 ······</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>Running·through·the·above,·the·most·important·points·are:</p><ul><li>Turn·on·global·tracing</li><li>Set·a·<code·class="inline">Trace·Pattern</code></li><li>Tell·<code·class="inline">dbg</code>·to·trace·function·Calls</li><li>Tell·it·specifically·to·trace·the·<a·href="et.html#trace_me/5"><code·class="inline">et:trace_me/5</code></a>·function</li></ul><p>When·you·run·the·<code·class="inline">et_trace_demo:test()</code>·function·above,·the·<code·class="inline">Viewer</code>·window·will
288 look·like·this·screenshot:</p><p><img·src="assets/coffee_order.png"·alt="Screenshot·of·the·Viewer·window"·title="Screenshot·of·the·Viewer·window"/></p>288 look·like·this·screenshot:</p><p><img·src="assets/coffee_order.png"·alt="Screenshot·of·the·Viewer·window"·title="Screenshot·of·the·Viewer·window"/></p>
289 </div>289 </div>
  
290 <div·class="bottom-actions"·id="bottom-actions">290 <div·class="bottom-actions"·id="bottom-actions">
291 ··<div·class="bottom-actions-item">291 ··<div·class="bottom-actions-item">
  
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337 ······</p>337 ······</p>
338 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>338 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
339 ····</footer>339 ····</footer>
340 ··</div>340 ··</div>
341 </main>341 </main>
342 </div>342 </div>
343 <script>343 <script>
344 ··function·mermaidLoaded()·{344 ··function·mermaidLoaded()·{
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553 ······</p>553 ······</p>
554 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>554 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
555 ····</footer>555 ····</footer>
556 ··</div>556 ··</div>
557 </main>557 </main>
558 </div>558 </div>
559 <script>559 <script>
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549 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>549 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
550 ······</p>550 ······</p>
551 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>551 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
552 ····</footer>552 ····</footer>
553 ··</div>553 ··</div>
554 </main>554 </main>
555 </div>555 </div>
556 <script>556 <script>
557 ··function·mermaidLoaded()·{557 ··function·mermaidLoaded()·{
558 ····mermaid.initialize({558 ····mermaid.initialize({
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144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
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146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
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195 ······</p>195 ······</p>
196 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>196 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
197 ····</footer>197 ····</footer>
198 ··</div>198 ··</div>
199 </main>199 </main>
200 </div>200 </div>
201 <script>201 <script>
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795 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>795 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
796 ····</footer>796 ····</footer>
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798 </main>798 </main>
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124 ··</h1>124 ··</h1>
  
125 <p>The·following·is·a·simple·example·of·an·FTP·session,·where·the·user·<code·class="inline">guest</code>·with125 <p>The·following·is·a·simple·example·of·an·FTP·session,·where·the·user·<code·class="inline">guest</code>·with
126 password·<code·class="inline">password</code>·logs·on·to·the·remote·host·<code·class="inline">erlang.org</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1105972835-1">(</span><span·class="p"·data-group-id="1105972835-1">)</span><span·class="p">.</span><span·class="w">126 password·<code·class="inline">password</code>·logs·on·to·the·remote·host·<code·class="inline">erlang.org</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8473337520-1">(</span><span·class="p"·data-group-id="8473337520-1">)</span><span·class="p">.</span><span·class="w">
127 ······</span><span·class="ss">ok</span><span·class="w">127 ······</span><span·class="ss">ok</span><span·class="w">
128 ······</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1105972835-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="1105972835-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·497,·SHA:·144cff4d334145217a6f21790db4936892cc3953d39be5c4245b9a82ee74a15d·...·]-3">)</span><span·class="p">.</span><span·class="w">128 ······</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8473337520-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="8473337520-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·497,·SHA:·fa7709887bf89a42790c669e82bf884bec8a8a5e0ca39a075b9659b10e184ac6·...·]-3">)</span><span·class="p">.</span><span·class="w">
129 ······</span><span·class="p"·data-group-id="1105972835-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.22</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="1105972835-6">}</span><span·class="w">129 ······</span><span·class="p"·data-group-id="8473337520-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.22</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="8473337520-6">}</span><span·class="w">
130 ······</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">user</span><span·class="p"·data-group-id="1105972835-7">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;guest&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;password&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·611b12f92ec5ac7cc0f86e352010ae4a2f5ca17e159ef3f5e11541d917e9baf4·...·]-7">)</span><span·class="p">.</span><span·class="w">130 ······</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">user</span><span·class="p"·data-group-id="8473337520-7">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;guest&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;password&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·20ebbefb92ac8c7eb8b5b018f0b119b8d492176e71f63433e2146a8d084d2f54·...·]-7">)</span><span·class="p">.</span><span·class="w">
131 ······</span><span·class="ss">ok</span><span·class="w">131 ······</span><span·class="ss">ok</span><span·class="w">
132 ······</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">pwd</span><span·class="p"·data-group-id="1105972835-8">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="1105972835-8">)</span><span·class="p">.</span><span·class="w">132 ······</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">pwd</span><span·class="p"·data-group-id="8473337520-8">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="8473337520-8">)</span><span·class="p">.</span><span·class="w">
133 ······</span><span·class="p"·data-group-id="1105972835-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/guest&quot;</span><span·class="p"·data-group-id="1105972835-9">}</span><span·class="w">133 ······</span><span·class="p"·data-group-id="8473337520-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/guest&quot;</span><span·class="p"·data-group-id="8473337520-9">}</span><span·class="w">
134 ······</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">cd</span><span·class="p"·data-group-id="1105972835-10">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;appl/examples&quot;</span><span·class="p"·data-group-id="1105972835-10">)</span><span·class="p">.</span><span·class="w">134 ······</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">cd</span><span·class="p"·data-group-id="8473337520-10">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;appl/examples&quot;</span><span·class="p"·data-group-id="8473337520-10">)</span><span·class="p">.</span><span·class="w">
135 ······</span><span·class="ss">ok</span><span·class="w">135 ······</span><span·class="ss">ok</span><span·class="w">
136 ······</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">lpwd</span><span·class="p"·data-group-id="1105972835-11">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="1105972835-11">)</span><span·class="p">.</span><span·class="w">136 ······</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">lpwd</span><span·class="p"·data-group-id="8473337520-11">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="8473337520-11">)</span><span·class="p">.</span><span·class="w">
137 ······</span><span·class="p"·data-group-id="1105972835-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/fred&quot;</span><span·class="p"·data-group-id="1105972835-12">}</span><span·class="p">.</span><span·class="w">137 ······</span><span·class="p"·data-group-id="8473337520-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/fred&quot;</span><span·class="p"·data-group-id="8473337520-12">}</span><span·class="p">.</span><span·class="w">
138 ······</span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">lcd</span><span·class="p"·data-group-id="1105972835-13">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/eproj/examples&quot;</span><span·class="p"·data-group-id="1105972835-13">)</span><span·class="p">.</span><span·class="w">138 ······</span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">lcd</span><span·class="p"·data-group-id="8473337520-13">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/eproj/examples&quot;</span><span·class="p"·data-group-id="8473337520-13">)</span><span·class="p">.</span><span·class="w">
139 ······</span><span·class="ss">ok</span><span·class="w">139 ······</span><span·class="ss">ok</span><span·class="w">
140 ······</span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="1105972835-14">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;appl.erl&quot;</span><span·class="p"·data-group-id="1105972835-14">)</span><span·class="p">.</span><span·class="w">140 ······</span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="8473337520-14">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;appl.erl&quot;</span><span·class="p"·data-group-id="8473337520-14">)</span><span·class="p">.</span><span·class="w">
141 ······</span><span·class="ss">ok</span><span·class="w">141 ······</span><span·class="ss">ok</span><span·class="w">
142 ······</span><span·class="mi">9</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1105972835-15">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="1105972835-15">)</span><span·class="p">.</span><span·class="w">142 ······</span><span·class="mi">9</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="8473337520-15">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="8473337520-15">)</span><span·class="p">.</span><span·class="w">
143 ······</span><span·class="ss">ok</span><span·class="w">143 ······</span><span·class="ss">ok</span><span·class="w">
144 ······</span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="1105972835-16">(</span><span·class="p"·data-group-id="1105972835-16">)</span><span·class="p">.</span><span·class="w">144 ······</span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ftp</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="8473337520-16">(</span><span·class="p"·data-group-id="8473337520-16">)</span><span·class="p">.</span><span·class="w">
145 ······</span><span·class="ss">ok</span></code></pre><p>The·file·<code·class="inline">appl.erl</code>·is·transferred·from·the·remote·to·the·local·host.·When·the145 ······</span><span·class="ss">ok</span></code></pre><p>The·file·<code·class="inline">appl.erl</code>·is·transferred·from·the·remote·to·the·local·host.·When·the
146 session·is·opened,·the·current·directory·at·the·remote·host·is·<code·class="inline">/home/guest</code>,146 session·is·opened,·the·current·directory·at·the·remote·host·is·<code·class="inline">/home/guest</code>,
147 and·<code·class="inline">/home/fred</code>·at·the·local·host.·Before·transferring·the·file,·the·current147 and·<code·class="inline">/home/fred</code>·at·the·local·host.·Before·transferring·the·file,·the·current
148 local·directory·is·changed·to·<code·class="inline">/home/eproj/examples</code>,·and·the·remote·directory148 local·directory·is·changed·to·<code·class="inline">/home/eproj/examples</code>,·and·the·remote·directory
149 is·set·to·<code·class="inline">/home/guest/appl/examples</code>.</p>149 is·set·to·<code·class="inline">/home/guest/appl/examples</code>.</p>
150 </div>150 </div>
  
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188 ········Built·using188 ········Built·using
189 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the189 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
190 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>190 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
191 ······</p>191 ······</p>
192 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>192 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
193 ····</footer>193 ····</footer>
194 ··</div>194 ··</div>
195 </main>195 </main>
196 </div>196 </div>
197 <script>197 <script>
198 ··function·mermaidLoaded()·{198 ··function·mermaidLoaded()·{
199 ····mermaid.initialize({199 ····mermaid.initialize({
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178 ········Built·using178 ········Built·using
179 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the179 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
180 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>180 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
181 ······</p>181 ······</p>
182 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>182 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
183 ····</footer>183 ····</footer>
184 ··</div>184 ··</div>
185 </main>185 </main>
186 </div>186 </div>
187 <script>187 <script>
188 ··function·mermaidLoaded()·{188 ··function·mermaidLoaded()·{
189 ····mermaid.initialize({189 ····mermaid.initialize({
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452 ······<p·class="built-using">452 ······<p·class="built-using">
453 ········Built·using453 ········Built·using
454 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the454 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
455 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>455 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
456 ······</p>456 ······</p>
457 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>457 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
458 ····</footer>458 ····</footer>
459 ··</div>459 ··</div>
460 </main>460 </main>
461 </div>461 </div>
462 <script>462 <script>
463 ··function·mermaidLoaded()·{463 ··function·mermaidLoaded()·{
464 ····mermaid.initialize({464 ····mermaid.initialize({
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141 ······<p·class="built-using">141 ······<p·class="built-using">
142 ········Built·using142 ········Built·using
143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
153 ····mermaid.initialize({153 ····mermaid.initialize({
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144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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274 ········Built·using274 ········Built·using
275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
277 ······</p>277 ······</p>
278 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>278 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
279 ····</footer>279 ····</footer>
280 ··</div>280 ··</div>
281 </main>281 </main>
282 </div>282 </div>
283 <script>283 <script>
284 ··function·mermaidLoaded()·{284 ··function·mermaidLoaded()·{
285 ····mermaid.initialize({285 ····mermaid.initialize({
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134 <p>The·HTTP·client·default·profile·is·started·when·the·<code·class="inline">Inets</code>·application·is134 <p>The·HTTP·client·default·profile·is·started·when·the·<code·class="inline">Inets</code>·application·is
135 started·and·is·then·available·to·all·processes·on·that·Erlang·node.·Other135 started·and·is·then·available·to·all·processes·on·that·Erlang·node.·Other
136 profiles·can·also·be·started·at·application·startup,·or·profiles·can·be·started136 profiles·can·also·be·started·at·application·startup,·or·profiles·can·be·started
137 and·stopped·dynamically·in·runtime.·Each·client·profile·spawns·a·new·process·to137 and·stopped·dynamically·in·runtime.·Each·client·profile·spawns·a·new·process·to
138 handle·each·request,·unless·a·persistent·connection·can·be·used·with·or·without138 handle·each·request,·unless·a·persistent·connection·can·be·used·with·or·without
139 pipelining.·The·client·adds·a·<code·class="inline">host</code>·header·and·an·empty·<code·class="inline">te</code>·header·if·there139 pipelining.·The·client·adds·a·<code·class="inline">host</code>·header·and·an·empty·<code·class="inline">te</code>·header·if·there
140 are·no·such·headers·present·in·the·request.</p><p>The·client·supports·IPv6·as·long·as·the·underlying·mechanisms·also·do·so.</p><p>The·following·is·to·be·put·in·the·Erlang·node·application·configuration·file·to140 are·no·such·headers·present·in·the·request.</p><p>The·client·supports·IPv6·as·long·as·the·underlying·mechanisms·also·do·so.</p><p>The·following·is·to·be·put·in·the·Erlang·node·application·configuration·file·to
141 start·a·profile·at·application·startup:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7168852683-1">[</span><span·class="p"·data-group-id="7168852683-2">{</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7168852683-3">[</span><span·class="p"·data-group-id="7168852683-4">{</spa[·...·truncated·by·diffoscope;·len:·606,·SHA:·644d1cae838158138061c01c93adeea4566503672ea3375ef86259e9edb4e849·...·]-1">]</span></code></pre><p>For·valid·properties,·see·<a·href="httpc.html"><code·class="inline">httpc</code></a>.</p><h2·id="getting-started"·class="section-heading">141 start·a·profile·at·application·startup:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0416123826-1">[</span><span·class="p"·data-group-id="0416123826-2">{</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0416123826-3">[</span><span·class="p"·data-group-id="0416123826-4">{</spa[·...·truncated·by·diffoscope;·len:·606,·SHA:·fe0481d1c9b568575cd8666e0ac504c42a2e8f9fdaef0a6fe45f14fca8d4a0f8·...·]-1">]</span></code></pre><p>For·valid·properties,·see·<a·href="httpc.html"><code·class="inline">httpc</code></a>.</p><h2·id="getting-started"·class="section-heading">
142 ··<a·href="#getting-started"·class="hover-link">142 ··<a·href="#getting-started"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
144 ··</a>144 ··</a>
145 ··<span·class="text">Getting·Started</span>145 ··<span·class="text">Getting·Started</span>
146 </h2>146 </h2>
147 <p>Start·<code·class="inline">Inets</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">inets</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9954953596-1">(</span><span·class="p"·data-group-id="9954953596-1">)</span><span·class="p">.</span><span·class="w">147 <p>Start·<code·class="inline">Inets</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">inets</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3225912784-1">(</span><span·class="p"·data-group-id="3225912784-1">)</span><span·class="p">.</span><span·class="w">
148 </span><span·class="ss">ok</span></code></pre><p>The·following·calls·use·the·default·client·profile.·Use·the·proxy148 </span><span·class="ss">ok</span></code></pre><p>The·following·calls·use·the·default·client·profile.·Use·the·proxy
149 <code·class="inline">&quot;www-proxy.mycompany.com:8000&quot;</code>,·except·from·requests·to·localhost.·This149 <code·class="inline">&quot;www-proxy.mycompany.com:8000&quot;</code>,·except·from·requests·to·localhost.·This
150 applies·to·all·the·following·requests.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">set_options</span><span·class="p"·data-group-id="8180013236-1">(</span><span·class="p"·data-group-id="8180013236-2">[</span><span·class="p"·data-group-id="8180013236-3">{</span><span·class="ss">proxy</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8180013236-4">{</spa[·...·truncated·by·diffoscope;·len:·230,·SHA:·1b44d1d05049150dcbd21345a14459383f0442dc5dc963b75f24e84752c4a4aa·...·]-5">}</span><span·class="p">,</span><span·class="w">150 applies·to·all·the·following·requests.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">set_options</span><span·class="p"·data-group-id="5307612284-1">(</span><span·class="p"·data-group-id="5307612284-2">[</span><span·class="p"·data-group-id="5307612284-3">{</span><span·class="ss">proxy</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5307612284-4">{</spa[·...·truncated·by·diffoscope;·len:·230,·SHA:·bea1ff444cd950a72602babbe1d326bc327a6b3e68a00eba070ef9291fd0f52d·...·]-5">}</span><span·class="p">,</span><span·class="w">
151 </span><span·class="p"·data-group-id="8180013236-6">[</span><span·class="s">&quot;localhost&quot;</span><span·class="p"·data-group-id="8180013236-6">]</span><span·class="p"·data-group-id="8180013236-4">}</span><span·class="p"·data-group-id="8180013236-3">}</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·63,·SHA:·0898ee5ab51961f92e7f00d26a87d933663411265d092d9dd9edde48bb0f8453·...·]-1">)</span><span·class="p">.</span><span·class="w">151 </span><span·class="p"·data-group-id="5307612284-6">[</span><span·class="s">&quot;localhost&quot;</span><span·class="p"·data-group-id="5307612284-6">]</span><span·class="p"·data-group-id="5307612284-4">}</span><span·class="p"·data-group-id="5307612284-3">}</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·63,·SHA:·f1679f8f9da8edd19adc7756cbac566057f988630b9918811e4ad07874273fdb·...·]-1">)</span><span·class="p">.</span><span·class="w">
152 </span><span·class="ss">ok</span></code></pre><p>The·following·is·an·ordinary·synchronous·request:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="p"·data-group-id="3299984375-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3299984375-2">{</span><span·class="p"·data-group-id="3299984375-3">{</span><span·class="n">Version</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·432,·SHA:·6f88e1ccc0edd6ceed04967071bd56c975edabad654b2e7b04a975051f79ea9d·...·]-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">152 </span><span·class="ss">ok</span></code></pre><p>The·following·is·an·ordinary·synchronous·request:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="p"·data-group-id="3246408037-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3246408037-2">{</span><span·class="p"·data-group-id="3246408037-3">{</span><span·class="n">Version</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·432,·SHA:·aeb15c41fb7557c6ce3103c696551f1078fd3ae3179e02ce0ae2c7f0f85c79f5·...·]-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
153 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="3299984375-4">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3299984375-5">{</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3299984375-6">[</span><span·class="p"·data-group-id="3299984375-6">]</span><span·class="p"·data-group-id="3299984375-5">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3299984375-7">[</span><span·class="p"·data-group-id="3299984375-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3299984375-8">[</span><span·class="p"·data-group-id="3299984375-8">]</span><span·class="p"·data-group-id="3299984375-4">)</span><span·class="p">.</span></code></pre><p>With·all·the·default·values·presented,·a·get·request·can·also·be·written·as 
154 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="p"·data-group-id="5014762477-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5014762477-2">{</span><span·class="p"·data-group-id="5014762477-3">{</span><span·class="n">Version</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReasonPhrase</span><span·class="p"·data-group-id="5014762477-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Body</span><span·class="p"·data-group-id="5014762477-2">}</span><span·class="p"·data-group-id="5014762477-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w"> 
155 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="5014762477-4">(</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p"·data-group-id="5014762477-4">)</span><span·class="p">.</span></code></pre><p>The·following·is·a·https·request·and·with·verification·of·the·host:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="p"·data-group-id="4606824891-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4606824891-2">{</span><span·class="p"·data-group-id="4606824891-3">{</span><span·class="n">Version</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReasonPhrase</span><span·class="p"·data-group-id="4606824891-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Body</span><span·class="p"·data-group-id="4606824891-2">}</span><span·class="p"·data-group-id="4606824891-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w"> 
156 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="4606824891-4">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4606824891-5">{</span><span·class="s">&quot;https://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·1397,·SHA:·09e4f2e249eee3a9613b0e9f9d383ea224b0e7d7ff222effc49dbf2ece3a5f5d·...·]153 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="3246408037-4">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3246408037-5">{</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·633,·SHA:·2d9a37ff061de6a45e9d8638dc20a08728e40b062c452464a6f95ea00965483f·...·]
 154 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="p"·data-group-id="1835176487-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1835176487-2">{</span><span·class="p"·data-group-id="1835176487-3">{</span><span·class="n">Version</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReasonPhrase</span><span·class="p"·data-group-id="1835176487-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Body</span><span·class="p"·data-group-id="1835176487-2">}</span><span·class="p"·data-group-id="1835176487-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
 155 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="1835176487-4">(</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p"·data-group-id="1835176487-4">)</span><span·class="p">.</span></code></pre><p>The·following·is·a·https·request·and·with·verification·of·the·host:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="p"·data-group-id="5960734210-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5960734210-2">{</span><span·class="p"·data-group-id="5960734210-3">{</span><span·class="n">Version</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReasonPhrase</span><span·class="p"·data-group-id="5960734210-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Body</span><span·class="p"·data-group-id="5960734210-2">}</span><span·class="p"·data-group-id="5960734210-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
 156 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="5960734210-4">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5960734210-5">{</span><span·class="s">&quot;https://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5960734210-6">[</span><span·class="p"·data-group-id="5960734210-6">]</span><span·class="p"·data-group-id="5960734210-5">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5960734210-7">[</span><span·class="p"·data-group-id="5960734210-8">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">ssl_verify_host_options</span><span·class="p"·data-group-id="5960734210-9">(</span><span·class="ss">true</span><span·class="p"·data-group-id="5960734210-9">)</span><span·class="p"·data-group-id="5960734210-8">}</span><span·class="p"·data-group-id="5960734210-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5960734210-10">[</span><span·class="p"·data-group-id="5960734210-10">]</span><span·class="p"·data-group-id="5960734210-4">)</span><span·class="p">.</span></code></pre><p>The·following·is·an·ordinary·asynchronous·request:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="p"·data-group-id="6486196627-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RequestId</span><span·class="p"·data-group-id="6486196627-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
157 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="8374611929-2">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8374611929-3">{</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·717,·SHA:·ced30f4f0e34e6ee90c6a9ce599fe9d35bcbaa65b66b280c733fc9ca07a628e4·...·]-2">)</span><span·class="p">.</span></code></pre><p>The·result·is·sent·to·the·calling·process·as·<code·class="inline">{http,·{ReqestId,·Result}}</code>.</p><p>In·this·case,·the·calling·process·is·the·shell,·so·the·following·result·is157 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="6486196627-2">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6486196627-3">{</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·717,·SHA:·48bd07766153fd327e3fcf0a0cf372bd94f860ee693d711b3f23a93cea2c5edb·...·]-2">)</span><span·class="p">.</span></code></pre><p>The·result·is·sent·to·the·calling·process·as·<code·class="inline">{http,·{ReqestId,·Result}}</code>.</p><p>In·this·case,·the·calling·process·is·the·shell,·so·the·following·result·is
158 received:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="6149661786-1">{</span><span·class="ss">http</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6149661786-2">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</sp[·...·truncated·by·diffoscope;·len:·97,·SHA:·8bc2abfdfc520428dbd9f7061598ca5bee1adb9a655b12bca776d82752a3d072·...·]-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">500</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">158 received:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="6489447882-1">{</span><span·class="ss">http</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6489447882-2">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</sp[·...·truncated·by·diffoscope;·len:·97,·SHA:·3fc1018957fb64c1f19bc02ee6bb9582cb0fd81855eee9735502b5880663af02·...·]-1">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">500</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
159 </span><span·class="ss">ok</span></code></pre><p>This·sends·a·request·with·a·specified·connection·header:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="p"·data-group-id="4407195753-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4407195753-2">{</span><span·class="p"·data-group-id="4407195753-3">{</span><span·class="n">NewVersion</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">200</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewReasonPhrase</span><span·class="p"·data-group-id="4407195753-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewHeaders</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewBody</span><span·class="p"·data-group-id="4407195753-2">}</span><span·class="p"·data-group-id="4407195753-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w"> 
160 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="4407195753-4">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4407195753-5">{</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4407195753-6">[</span><span·class="p"·data-group-id="4407195753-7">{</span><span·class="s">&quot;connection&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;close&quot;</span><span·class="p"·data-group-id="4407195753-7">}</span><span·class="p"·data-group-id="4407195753-6">]</span><span·class="p"·data-group-id="4407195753-5">}</span><span·class="p">,</span><span·class="w"> 
161 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="4407195753-8">[</span><span·class="p"·data-group-id="4407195753-8">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4407195753-9[·...·truncated·by·diffoscope;·len:·1167,·SHA:·0621946495ba22e93fe96fb3633cb75fb02699a1eb958227967926a7d1f1ad1e·...·]">159 </span><span·class="ss">ok</span></code></pre><p>This·sends·a·request·with·a·specified·connection·header:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="p"·data-group-id="6500975810-1">{</span><span·class="ss">ok</sp[·...·truncated·by·diffoscope;·len:·731,·SHA:·85a3abd451b3712bde72c05e0339555de6bb7e2046a93aa37aa193d924972b91·...·]">
 160 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="6500975810-4">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6500975810-5">{</span><span·class="s">&quot;http://www.erlang.org&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6500975810-6">[</span><span·class="p"·data-group-id="6500975810-7">{</span><span·class="s">&quot;connection&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;close&quot;</span><span·class="p"·data-group-id="6500975810-7">}</span><span·class="p"·data-group-id="6500975810-6">]</span><span·class="p"·data-group-id="6500975810-5">}</span><span·class="p">,</span><span·class="w">
 161 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="6500975810-8">[</span><span·class="p"·data-group-id="6500975810-8">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6500975810-9">[</span><span·class="p"·data-group-id="6500975810-9">]</span><span·class="p"·data-group-id="6500975810-4">)</span><span·class="p">.</span></code></pre><p>This·sends·an·HTTP·request·over·a·unix·domain·socket·(experimental):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">9&gt;·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">set_options</span><span·class="p"·data-group-id="2666420773-1">(</span><span·class="p"·data-group-id="2666420773-2">[</span><span·class="p"·data-group-id="2666420773-3">{</span><span·class="ss">ipfamily</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">local</span><span·class="p"·data-group-id="2666420773-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2666420773-4">{</span><span·class="ss">unix_socket</span><span·class="p">,</span><span·class="s">&quot;/tmp/unix_socket/consul_http.sock&quot;</span><span·class="p"·data-group-id="2666420773-4">}</span><span·class="p"·data-group-id="2666420773-2">]</span><span·class="p"·data-group-id="2666420773-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
162 10&gt;·</span><span·class="p"·data-group-id="9314629268-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9314629268-6">{</span><span·class="p"·data-group-id="9314629268-7">{</span><span·class="n">NewVersion</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·446,·SHA:·d9f829707eafb1eb5368fe09f8e103d99c397907439860d00e5fcab96e820250·...·]-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">162 10&gt;·</span><span·class="p"·data-group-id="2666420773-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2666420773-6">{</span><span·class="p"·data-group-id="2666420773-7">{</span><span·class="n">NewVersion</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·446,·SHA:·048125909858e489914db7c9efd584b31ab1099cc5ab56f146683b384ae19eac·...·]-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
163 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="9314629268-8">(</span><span·class="nb">put</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9314629268-9">{</span><span·class="s">&quot;http:///v1/kv/foo&quot;</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·1778,·SHA:·9e1265d8dbeac1b1eecfffb4d65233e1f2b19a9166808dbb06cb60f5641a60bc·...·]-2">)</span><span·class="p">.</span><span·class="w">163 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="nc">httpc</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="2666420773-8">(</span><span·class="nb">put</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2666420773-9">{</span><span·class="s">&quot;http:///v1/kv/foo&quot;</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·1778,·SHA:·795df9e90a765be7e19f11931252685e3c4076377858389421e6dfd2563ec606·...·]-2">)</span><span·class="p">.</span><span·class="w">
164 </span><span·class="p"·data-group-id="5872887153-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.45</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·513,·SHA:·05a9ad0118459bbe8347a9d1a7c4773943528f4d6516622efddf6abef2de63d6·...·]-1">)</span><span·class="p">.</span><span·class="w">164 </span><span·class="p"·data-group-id="7311306280-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.45</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·513,·SHA:·1557454eabaa1b7fb42ecd9695bc524340558b367cdbef7608571d0755e9a9e4·...·]-1">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p"·data-group-id="0391988532-2">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">econnrefused</span><span·class="p"·data-group-id="0391988532-2">}</span></code></pre><p>Stop·the·HTTP·client·profile:</p><pre><code·class="m[·...·truncated·by·diffoscope;·len:·352,·SHA:·a26a04d78c99d47df7174481c662a79c8f6170a77677fe5e2682ef4d40b46cf1·...·]-1">)</span><span·class="p">.</span><span·class="w">165 </span><span·class="p"·data-group-id="5111183667-2">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">econnrefused</span><span·class="p"·data-group-id="5111183667-2">}</span></code></pre><p>Stop·the·HTTP·client·profile:</p><pre><code·class="m[·...·truncated·by·diffoscope;·len:·352,·SHA:·c4281ff0f821b047a08f8fe00f1ce4d63ad2293cc9e2396e127c11ab59b4b082·...·]-1">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="ss">ok</span></code></pre><p>Alternative·way·to·stop·the·HTTP·client·profile:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">13&gt;·</span><span·class="nc">inets</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="8591440105-1">(</span><span·class="ss">httpc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="8591440105-1">)</span><span·class="p">.</span><span·class="w">166 </span><span·class="ss">ok</span></code></pre><p>Alternative·way·to·stop·the·HTTP·client·profile:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">13&gt;·</span><span·class="nc">inets</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9547938086-1">(</span><span·class="ss">httpc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="9547938086-1">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="ss">ok</span></code></pre>167 </span><span·class="ss">ok</span></code></pre>
168 </div>168 </div>
  
169 <div·class="bottom-actions"·id="bottom-actions">169 <div·class="bottom-actions"·id="bottom-actions">
170 ··<div·class="bottom-actions-item">170 ··<div·class="bottom-actions-item">
  
171 ······<a·href="inets_services.html"·class="bottom-actions-button"·rel="prev">171 ······<a·href="inets_services.html"·class="bottom-actions-button"·rel="prev">
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211 ······<p·class="built-using">211 ······<p·class="built-using">
212 ········Built·using212 ········Built·using
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214 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>214 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
215 ······</p>215 ······</p>
216 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>216 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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223 ····mermaid.initialize({223 ····mermaid.initialize({
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137 underlying·mechanisms·also·do·so.</p><p>The·server·implements·numerous·features,·such·as:</p><ul><li>Secure·Sockets·Layer·(SSL)</li><li>Erlang·Scripting·Interface·(ESI)</li><li>Common·Gateway·Interface·(CGI)</li><li>User·Authentication·(using·Mnesia,·Dets·or·plain·text·database)</li><li>Common·Logfile·Format·(with·or·without·disk_log(3)·support)</li><li>URL·Aliasing</li><li>Action·Mappings</li><li>Directory·Listings</li></ul><p>The·configuration·of·the·server·is·provided·as·an·Erlang·property·list.</p><p>As·of·<code·class="inline">Inets</code>·5.0·the·HTTP·server·is·an·easy·to·start/stop·and·customize·web137 underlying·mechanisms·also·do·so.</p><p>The·server·implements·numerous·features,·such·as:</p><ul><li>Secure·Sockets·Layer·(SSL)</li><li>Erlang·Scripting·Interface·(ESI)</li><li>Common·Gateway·Interface·(CGI)</li><li>User·Authentication·(using·Mnesia,·Dets·or·plain·text·database)</li><li>Common·Logfile·Format·(with·or·without·disk_log(3)·support)</li><li>URL·Aliasing</li><li>Action·Mappings</li><li>Directory·Listings</li></ul><p>The·configuration·of·the·server·is·provided·as·an·Erlang·property·list.</p><p>As·of·<code·class="inline">Inets</code>·5.0·the·HTTP·server·is·an·easy·to·start/stop·and·customize·web
138 server·providing·the·most·basic·web·server·functionality.·Inets·is·designed·for138 server·providing·the·most·basic·web·server·functionality.·Inets·is·designed·for
139 embedded·systems·and·if·you·want·a·full-fledged·web·server·there·are·other139 embedded·systems·and·if·you·want·a·full-fledged·web·server·there·are·other
140 erlang·open·source·alternatives.</p><p>Almost·all·server·functionality·has·been·implemented·using·an·especially·crafted140 erlang·open·source·alternatives.</p><p>Almost·all·server·functionality·has·been·implemented·using·an·especially·crafted
141 server·API,·which·is·described·in·the·Erlang·Web·Server·API.·This·API·can·be141 server·API,·which·is·described·in·the·Erlang·Web·Server·API.·This·API·can·be
142 used·to·enhance·the·core·server·functionality,·for·example·with·custom·logging142 used·to·enhance·the·core·server·functionality,·for·example·with·custom·logging
143 and·authentication.</p><p>The·following·is·to·be·put·in·the·Erlang·node·application·configuration·file·to143 and·authentication.</p><p>The·following·is·to·be·put·in·the·Erlang·node·application·configuration·file·to
144 start·an·HTTP·server·at·application·startup:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6337963699-1">[</span><span·class="p"·data-group-id="6337963699-2">{</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6337963699-3">[</span><span·class="p"·data-group-id="6337963699-4">{</span><span·class="ss">services</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6337963699-5">[</span><span·class="p"·data-group-id="6337963699-6">{</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6337963699-7">[</span><span·class="p"·data-group-id="6337963699-8">{</span><span·class="ss">proplist_file</span><span·class="p">,</span><span·class="w"> 
145 ···········</span><span·class="s">&quot;/var/tmp/server_root/conf/8888_props.conf&quot;</span><span·class="p"·data-group-id="6337963699-8">}</span><span·class="p"·data-group-id="6337963699-7">]</span><span·class="p"·data-group-id="6337963699-6">}</span><span·class="p">,</span><span·class="w">144 start·an·HTTP·server·at·application·startup:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0230409695-1">[</span><span·class="p"·data-group-id="0230409695-2">{</span><span·class="ss">inets</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·528,·SHA:·ad03b44a4890246af0f0662216a6d5b7aa4877a545b4c5c3d07f397dcdaf0ec5·...·]</span><span·class="p">,</span><span·class="w">
 145 ···········</span><span·class="s">&quot;/var/tmp/server_root/conf/8888_props.conf&quot;</span><span·class="p"·data-group-id="0230409695-8">}</span><span·class="p"·data-group-id="0230409695-7">]</span><span·class="p"·data-group-id="0230409695-6">}</span><span·class="p">,</span><span·class="w">
146 ··········</span><span·class="p"·data-group-id="6337963699-9">{</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6337963699-10">[</span><span·class="p"·data-group-id="6337963699-11">{</span><span·class="ss">proplist_file</span><span·class="p">,</span><span·class="w">146 ··········</span><span·class="p"·data-group-id="0230409695-9">{</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0230409695-10">[</span><span·class="p"·data-group-id="0230409695-11">{</span><span·class="ss">proplist_file</span><span·class="p">,</span><span·class="w">
147 ···········</span><span·class="s">&quot;/var/tmp/server_root/conf/8080_props.conf&quot;</span><span·class="p"·data-group-id="6337963699-11">}</span><span·class="p"·data-group-id="6337963699-10">]</span><span·class="p"·data-group-id="6337963699-9">}</span><span·class="p"·data-group-id="6337963699-5">]</span><span·class="p"·data-group-id="6337963699-4">}</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·127,·SHA:·fc8b90fbe03109ff6c608527b8d860d79773c887c99973e8810df3fe4246c2c6·...·]-1">]</span><span·class="p">.</span></code></pre><p>The·server·is·configured·using·an·Erlang·property·list.·For·the·available147 ···········</span><span·class="s">&quot;/var/tmp/server_root/conf/8080_props.conf&quot;</span><span·class="p"·data-group-id="0230409695-11">}</span><span·class="p"·data-group-id="0230409695-10">]</span><span·class="p"·data-group-id="0230409695-9">}</span><span·class="p"·data-group-id="0230409695-5">]</span><span·class="p"·data-group-id="0230409695-4">}</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·127,·SHA:·63477c45959f5bf6bef6eac4503ac34712de26a68c62d989cff1da4714f2ae5b·...·]-1">]</span><span·class="p">.</span></code></pre><p>The·server·is·configured·using·an·Erlang·property·list.·For·the·available
148 properties,·see·<a·href="httpd.html"><code·class="inline">httpd</code></a>.</p><p>The·available·configuration·properties·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">httpd_service</span><span·class="p"·data-group-id="9811798972-1">(</span><span·class="p"·data-group-id="9811798972-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9811798972-2">{</span><span·class="ss">httpd</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·201,·SHA:·a360763c8beaf02006efc9992e2508487b741feeb63a8a73ddbb023609653052·...·]-2">}</span><span·class="w">148 properties,·see·<a·href="httpd.html"><code·class="inline">httpd</code></a>.</p><p>The·available·configuration·properties·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">httpd_service</span><span·class="p"·data-group-id="4912869311-1">(</span><span·class="p"·data-group-id="4912869311-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4912869311-2">{</span><span·class="ss">httpd</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·201,·SHA:·421a80c73a552b380a2af73a4f951dcfea1e7b7d21a983dd4e9cef1bd721f292·...·]-2">}</span><span·class="w">
149 </span><span·class="nf">httpd</span><span·class="p"·data-group-id="9811798972-4">(</span><span·class="p"·data-group-id="9811798972-4">)</span><span·class="w">·········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9811798972-5">[</span><span·class="nf">httpd_config</span><span·cl[·...·truncated·by·diffoscope;·len:·139,·SHA:·424c1757040ef4ce65b0b642a4a73ca212e317cce4e24d69fb716e6b3dd4bf5f·...·]-5">]</span><span·class="w">149 </span><span·class="nf">httpd</span><span·class="p"·data-group-id="4912869311-4">(</span><span·class="p"·data-group-id="4912869311-4">)</span><span·class="w">·········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4912869311-5">[</span><span·class="nf">httpd_config</span><span·cl[·...·truncated·by·diffoscope;·len:·139,·SHA:·0c2fab714894f462341cb0ac402b5fa87082f3b5d7f0635ff0304dfc71ff2a18·...·]-5">]</span><span·class="w">
150 </span><span·class="nf">httpd_config</span><span·class="p"·data-group-id="9811798972-7">(</span><span·class="p"·data-group-id="9811798972-7">)</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9811798972-8">{</span><span·class="ss">proplist_file</span><span·class="p[·...·truncated·by·diffoscope;·len:·209,·SHA:·96039448f36e04406dc92b6cdac7a035cc5ab5ffee72fa5eaaa8682bc8c84836·...·]-8">}</span><span·class="w">150 </span><span·class="nf">httpd_config</span><span·class="p"·data-group-id="4912869311-7">(</span><span·class="p"·data-group-id="4912869311-7">)</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4912869311-8">{</span><span·class="ss">proplist_file</span><span·class="p[·...·truncated·by·diffoscope;·len:·209,·SHA:·6e8300a3b64ba973093074619b9c92f87868d3ee9fcd4b1c95f8fb757b5d78d3·...·]-8">}</span><span·class="w">
151 ···················</span><span·class="p"·data-group-id="9811798972-10">{</span><span·class="ss">debug</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">debug</span><span·class="p"·data-group-id="9811798972-11">(</span><span·class="p"·data-group-id="9811798972-11">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·6a7a7a3cba51a6eb6fcbc33abf6d1b2d7d4f03bf2455d0f6d6ecd57bd4644542·...·]-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">151 ···················</span><span·class="p"·data-group-id="4912869311-10">{</span><span·class="ss">debug</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">debug</span><span·class="p"·data-group-id="4912869311-11">(</span><span·class="p"·data-group-id="4912869311-11">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·0ca14dfe47ce072101c19e279c03751090698e2b24739ba464d5c911a2807994·...·]-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
152 ···················</span><span·class="p"·data-group-id="9811798972-12">{</span><span·class="ss">accept_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9811798972-13">(</span><span·class="p"·data-group-id="9811798972-13">)</span><span·class="p"·data-group-id="9811798972-12">}</span><span·class="w"> 
153 </span><span·class="nf">debug</span><span·class="p"·data-group-id="9811798972-14">(</span><span·class="p"·data-group-id="9811798972-14">)</span><span·class="w">·········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">disable</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="9811798972-15">[</span><span·class="nf">debug_options</span><span·class="p"·data-group-id="9811798972-16">(</span><span·class="p"·data-group-id="9811798972-16">)</span><span·class="p"·data-group-id="9811798972-15">]</span><span·class="w"> 
154 </span><span·class="nf">debug_options</span><span·class="p"·data-group-id="9811798972-17">(</span><span·class="p"·data-group-id="9811798972-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·345,·SHA:·9a8f9356d73ee81b5b7cf3b6b0157be56a9c53da8e3bd821f319fcfdfec1065a·...·]</span><span·class="w">152 ···················</span><span·class="p"·data-group-id="4912869311-12">{</span><span·class="ss">accept_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4912869311-13">(</span><span[·...·truncated·by·diffoscope;·len:·96,·SHA:·266170926ec7ddcd8cbbe69eb14a40dc24b5c371bb05a979f0ddd6cc2759ef89·...·]</span><span·class="w">
 153 </span><span·class="nf">debug</span><span·class="p"·data-group-id="4912869311-14">(</span><span·class="p"·data-group-id="4912869311-14">)</span><span·class="w">·········</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">disable</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="4912869311-15">[</span><span·class="nf">debug_options</span><span·class="p"·data-group-id="4912869311-16">(</span><span·class="p"·data-group-id="4912869311-16">)</span><span·class="p"·data-group-id="4912869311-15">]</span><span·class="w">
 154 </span><span·class="nf">debug_options</span><span·class="p"·data-group-id="4912869311-17">(</span><span·class="p"·data-group-id="4912869311-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4912869311-18">{</span><span·class="ss">all_functions</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="4912869311-19">(</span><span·class="p"·data-group-id="4912869311-19">)</span><span·class="p"·data-group-id="4912869311-18">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
155 ···················</span><span·class="p"·data-group-id="9811798972-20">{</span><span·class="ss">exported_functions</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="9811798972-21">(</span><span·class="p"·data-group-id="9811798972-21">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·3fbe5261c6fceba18a1939375ddd46dace1ef78dbc6c24d5db8e0046945a781a·...·]-20">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">155 ···················</span><span·class="p"·data-group-id="4912869311-20">{</span><span·class="ss">exported_functions</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="4912869311-21">(</span><span·class="p"·data-group-id="4912869311-21">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·fd0dc035c04a4f7ec6973c475bba2513af9220506ba0b41c9b0b170e4a88d993·...·]-20">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
156 ···················</span><span·class="p"·data-group-id="9811798972-22">{</span><span·class="ss">disable</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="9811798972-23">(</span><span·class="p"·data-group-id="9811798972-23">)</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·6a5c9458db0fc1ec09f0a9e477633d0405dd227097249e0bcdb329593dea057d·...·]-22">}</span><span·class="w">156 ···················</span><span·class="p"·data-group-id="4912869311-22">{</span><span·class="ss">disable</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="4912869311-23">(</span><span·class="p"·data-group-id="4912869311-23">)</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·2a31fdd6422fd4fe2f685f070b2e6160d35cc12ea99d3e6618e9fbd5283c15e0·...·]-22">}</span><span·class="w">
157 </span><span·class="nf">modules</span><span·class="p"·data-group-id="9811798972-24">(</span><span·class="p"·data-group-id="9811798972-24">)</span><span·class="w">·······</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9811798972-25">[</span><span·class="nf">atom</span><span·class="p"[·...·truncated·by·diffoscope;·len:·134,·SHA:·b98c6e9b18fbfffa48a48fe731462252fd37dbb53b08092bd3802d3443a9ce65·...·]-25">]</span></code></pre><p>Here:</p><ul><li><p><strong><code·class="inline">{proplist_file,·file()}</code></strong>·-·File·containing·an·Erlang·property·list,157 </span><span·class="nf">modules</span><span·class="p"·data-group-id="4912869311-24">(</span><span·class="p"·data-group-id="4912869311-24">)</span><span·class="w">·······</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4912869311-25">[</span><span·class="nf">atom</span><span·class="p"[·...·truncated·by·diffoscope;·len:·134,·SHA:·3c3b4e44ec1643b37c09faed62990939933dd1dd03cf3e77580863414deac780·...·]-25">]</span></code></pre><p>Here:</p><ul><li><p><strong><code·class="inline">{proplist_file,·file()}</code></strong>·-·File·containing·an·Erlang·property·list,
158 followed·by·a·full·stop,·describing·the·HTTP·server·configuration.</p></li><li><p><strong><code·class="inline">{debug,·debug()}</code></strong>·-·Can·enable·trace·on·all·functions·or·only·exported158 followed·by·a·full·stop,·describing·the·HTTP·server·configuration.</p></li><li><p><strong><code·class="inline">{debug,·debug()}</code></strong>·-·Can·enable·trace·on·all·functions·or·only·exported
159 functions·on·chosen·modules.</p></li><li><p><strong><code·class="inline">{accept_timeout,·integer()}</code></strong>·-·Sets·the·wanted·time-out·value·for·the159 functions·on·chosen·modules.</p></li><li><p><strong><code·class="inline">{accept_timeout,·integer()}</code></strong>·-·Sets·the·wanted·time-out·value·for·the
160 server·to·set·up·a·request·connection.</p></li></ul><h2·id="getting-started"·class="section-heading">160 server·to·set·up·a·request·connection.</p></li></ul><h2·id="getting-started"·class="section-heading">
161 ··<a·href="#getting-started"·class="hover-link">161 ··<a·href="#getting-started"·class="hover-link">
162 ····<i·class="ri-link-m"·aria-hidden="true"></i>162 ····<i·class="ri-link-m"·aria-hidden="true"></i>
163 ··</a>163 ··</a>
164 ··<span·class="text">Getting·Started</span>164 ··<span·class="text">Getting·Started</span>
165 </h2>165 </h2>
166 <p><a·href=""·id="using_http_server_api"></a></p><p>Start·<code·class="inline">Inets</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">inets</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4422514788-1">(</span><span·class="p"·data-group-id="4422514788-1">)</span><span·class="p">.</span><span·class="w">166 <p><a·href=""·id="using_http_server_api"></a></p><p>Start·<code·class="inline">Inets</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">inets</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3023738354-1">(</span><span·class="p"·data-group-id="3023738354-1">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="ss">ok</span></code></pre><p>Start·an·HTTP·server·with·minimal·required·configuration.·If·you·specify·port167 </span><span·class="ss">ok</span></code></pre><p>Start·an·HTTP·server·with·minimal·required·configuration.·If·you·specify·port
168 <code·class="inline">0</code>,·an·arbitrary·available·port·is·used,·and·you·can·use·function·<code·class="inline">info</code>·to168 <code·class="inline">0</code>,·an·arbitrary·available·port·is·used,·and·you·can·use·function·<code·class="inline">info</code>·to
169 find·which·port·number·that·was·picked:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="p"·data-group-id="0738916305-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="0738916305-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·703,·SHA:·cceb51b55237b627f8ec985c7342a3989bbe28f9aafd1eff418d8f9d34387998·...·]-5">}</span><span·class="p">,</span><span·class="w">169 find·which·port·number·that·was·picked:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="p"·data-group-id="1556353486-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="1556353486-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·703,·SHA:·e6efbc617b76dac5fa5026b7aca880ee61bf639b7d263f89bf13a0e78cd212d7·...·]-5">}</span><span·class="p">,</span><span·class="w">
170 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="0738916305-6">{</span><span·class="ss">document_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/htdocs&quot;</span><span·class="p"·data-group-id="0738916305-6">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·302,·SHA:·8a326dd3c17e8a33bb78c9060a70d78c6f30663ec84f98b11f0f9e140b115863·...·]-2">)</span><span·class="p">.</span><span·class="w">170 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="1556353486-6">{</span><span·class="ss">document_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/htdocs&quot;</span><span·class="p"·data-group-id="1556353486-6">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·302,·SHA:·bf5bf68ad72ed0a7e3286f960077f85be4fbc15ebf71ef317eb2540580d93d5d·...·]-2">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="p"·data-group-id="0738916305-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="mf">0.79</span><span·class="p">.</span><span·class="mi">0</span><span·class="p"·data-group-id="0738916305-8">}</span></code></pre><p>Call·<code·cla[·...·truncated·by·diffoscope;·len:·319,·SHA:·643e3c802b62c9a9c95e987400aa51d06d36d71873a22949f27c19fe6f3e37d8·...·]3-1">)</span><span·class="p">.</span><span·class="w">171 </span><span·class="p"·data-group-id="1556353486-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="mf">0.79</span><span·class="p">.</span><span·class="mi">0</span><span·class="p"·data-group-id="1556353486-8">}</span></code></pre><p>Call·<code·cla[·...·truncated·by·diffoscope;·len:·319,·SHA:·5f07b3683494feec442e07e58842b2f4d27abde5e7b2f17c59690fd6ee93a13e·...·]3-1">)</span><span·class="p">.</span><span·class="w">
172 </span><span·class="p"·data-group-id="4537473483-2">[</span><span·class="p"·data-group-id="4537473483-3">{</span><span·class="ss">mime_types</span><span·class="p">,</span><span·class="p"·data-group-id="4537473483-4">[</span><span·class="p"·data-group-id="4537473483-5">{</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·472,·SHA:·e8d0bb4f60d00501defc62e178cd0bd178ed364145c55a213d1fd3663eb889e1·...·]3-3">}</span><span·class="p">,</span><span·class="w">172 </span><span·class="p"·data-group-id="9252047313-2">[</span><span·class="p"·data-group-id="9252047313-3">{</span><span·class="ss">mime_types</span><span·class="p">,</span><span·class="p"·data-group-id="9252047313-4">[</span><span·class="p"·data-group-id="9252047313-5">{</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·472,·SHA:·34496c79cedd9fed8e408ebb3267da421b3316ac1f86d85636f01ecdeaf77ead·...·]3-3">}</span><span·class="p">,</span><span·class="w">
173 ·</span><span·class="p"·data-group-id="4537473483-7">{</span><span·class="ss">server_name</span><span·class="p">,</span><span·class="s">&quot;machine.local&quot;</span><span·class="p"·data-group-id="4537473483-7">}</span><span·class="p">,</span><span·class="w">173 ·</span><span·class="p"·data-group-id="9252047313-7">{</span><span·class="ss">server_name</span><span·class="p">,</span><span·class="s">&quot;machine.local&quot;</span><span·class="p"·data-group-id="9252047313-7">}</span><span·class="p">,</span><span·class="w">
174 ·</span><span·class="p"·data-group-id="4537473483-8">{</span><span·class="ss">bind_address</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4537473483-9">{</span><span·class="mi">127</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·170,·SHA:·c066bf32c8d81a047a0b0a2f4bb9d801f59ebc04d4ca630d7b2d7eab495c72d7·...·]3-8">}</span><span·class="p">,</span><span·class="w">174 ·</span><span·class="p"·data-group-id="9252047313-8">{</span><span·class="ss">bind_address</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9252047313-9">{</span><span·class="mi">127</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·170,·SHA:·9ea9308b5283a73aa49ee9af7da571a5ae5cca282e243564ce567c41c16fa8e7·...·]3-8">}</span><span·class="p">,</span><span·class="w">
175 ·</span><span·class="p"·data-group-id="4537473483-10">{</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="s">&quot;/tmp&quot;</span><span·class="p"·data-group-id="4537473483-10">}</span><span·class="p">,</span><span·class="w">175 ·</span><span·class="p"·data-group-id="9252047313-10">{</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="s">&quot;/tmp&quot;</span><span·class="p"·data-group-id="9252047313-10">}</span><span·class="p">,</span><span·class="w">
176 ·</span><span·class="p"·data-group-id="4537473483-11">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="mi">59408</span><span·class="p"·data-group-id="4537473483-11">}</span><span·class="p">,</span><span·class="w">176 ·</span><span·class="p"·data-group-id="9252047313-11">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="mi">59408</span><span·class="p"·data-group-id="9252047313-11">}</span><span·class="p">,</span><span·class="w">
177 ·</span><span·class="p"·data-group-id="4537473483-12">{</span><span·class="ss">document_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/htdocs&quot;</span><span·class="p"·data-group-id="4537473483-12">}</span><span·class="p">,</span><span·class="w">177 ·</span><span·class="p"·data-group-id="9252047313-12">{</span><span·class="ss">document_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/htdocs&quot;</span><span·class="p"·data-group-id="9252047313-12">}</span><span·class="p">,</span><span·class="w">
178 ·</span><span·class="p"·data-group-id="4537473483-13">{</span><span·class="ss">ipfamily</span><span·class="p">,</span><span·class="ss">inet</span><span·class="p"·data-group-id="4537473483-13">}</span><span·class="p"·data-group-id="4537473483-2">]</span></code></pre><p>Reload·the·configuration·w[·...·truncated·by·diffoscope;·len:·518,·SHA:·a51faf750bf7d7769f7cb3f94c92bfd0a3a8bb8f6fe89ea12bbfc403969bed1a·...·]2-3">}</span><span·class="p">,</span><span·class="w">178 ·</span><span·class="p"·data-group-id="9252047313-13">{</span><span·class="ss">ipfamily</span><span·class="p">,</span><span·class="ss">inet</span><span·class="p"·data-group-id="9252047313-13">}</span><span·class="p"·data-group-id="9252047313-2">]</span></code></pre><p>Reload·the·configuration·w[·...·truncated·by·diffoscope;·len:·518,·SHA:·1f8cedd7ba34e3a85dc61409f9d775953e54a9ea0e58c510803fa6f2e4f4acba·...·]2-3">}</span><span·class="p">,</span><span·class="w">
179 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="6946460352-4">{</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/www_test&quot;</span><span·class="p"·data-group-id="6946460352-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·183,·SHA:·31d3644df4e579e729a2a863bc132ebf69778aafd46f4be71a0b028f1079d2d2·...·]2-5">}</span><span·class="p">,</span><span·class="w">179 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="4851576032-4">{</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/www_test&quot;</span><span·class="p"·data-group-id="4851576032-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·183,·SHA:·08df248152012b708250ec9844677f4508cbbf550750fe0d04893b145fce3ff8·...·]2-5">}</span><span·class="p">,</span><span·class="w">
180 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="6946460352-6">{</span><span·class="ss">bind_address</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;localhost&quot;</span><span·class="p"·data-group-id="6946460352-6">}</span><span·class="p"·data-group-id="6946460352-2">]</span>[·...·truncated·by·diffoscope;·len:·126,·SHA:·b5e1dbeb9bec4bccb1d5f00f8e11908556e69615def2ecdad0f64c2e6f6568e4·...·]2-1">)</span><span·class="p">.</span><span·class="w">180 </span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="4851576032-6">{</span><span·class="ss">bind_address</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;localhost&quot;</span><span·class="p"·data-group-id="4851576032-6">}</span><span·class="p"·data-group-id="4851576032-2">]</span>[·...·truncated·by·diffoscope;·len:·126,·SHA:·fbc9231832c973a4ee6b367c3a51fa70e1e711cb723165c374806828205c0bd7·...·]2-1">)</span><span·class="p">.</span><span·class="w">
181 </span><span·class="ss">ok</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p><code·class="inline">port</code>·and·<code·class="inline">bind_address</code>·cannot·be·changed.·Clients·trying·to·access·the181 </span><span·class="ss">ok</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p><code·class="inline">port</code>·and·<code·class="inline">bind_address</code>·cannot·be·changed.·Clients·trying·to·access·the
182 server·during·the·reload·get·a·service·temporary·unavailable·answer.</p></section><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">httpd</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="2151198997-1">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2151198997-2">[</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">documen[·...·truncated·by·diffoscope;·len:·107,·SHA:·d50824b0f81ee28ca8b0f0e085e49f92094d64045f027b53ddebef22109cb4b1·...·]-1">)</span><span·class="p">.</span><span·class="w">182 server·during·the·reload·get·a·service·temporary·unavailable·answer.</p></section><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">httpd</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="8353604502-1">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8353604502-2">[</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">documen[·...·truncated·by·diffoscope;·len:·107,·SHA:·cbe15586e24a03024cc9107e50c12a132503cc64d60d05ff278366214046cfbc·...·]-1">)</span><span·class="p">.</span><span·class="w">
183 </span><span·class="p"·data-group-id="2151198997-3">[</span><span·class="p"·data-group-id="2151198997-4">{</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/www_test&quot;</span><span·class="p"·data-group-id="2151198997-4">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·1730,·SHA:·c63b73b230b9cc86764cef2ccef7c1f7d4f9a686c7b2a9e002cc9c5a24050fd6·...·]-1">)</span><span·class="p">.</span></code></pre><p>Notice·that·<code·class="inline">bind_address</code>·must·be·the·IP·address·reported·by·function·<code·class="inline">info</code>183 </span><span·class="p"·data-group-id="8353604502-3">[</span><span·class="p"·data-group-id="8353604502-4">{</span><span·class="ss">server_root</span><span·class="p">,</span><span·class="s">&quot;/tmp/www_test&quot;</span><span·class="p"·data-group-id="8353604502-4">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·1730,·SHA:·7072aae3a22a10ace99918003fa1c074724e910fa9fa6831652cd3aae26c12f0·...·]-1">)</span><span·class="p">.</span></code></pre><p>Notice·that·<code·class="inline">bind_address</code>·must·be·the·IP·address·reported·by·function·<code·class="inline">info</code>
184 and·cannot·be·the·hostname·that·is·allowed·when·putting·in·<code·class="inline">bind_address</code>.</p><h2·id="dynamic-web-pages"·class="section-heading">184 and·cannot·be·the·hostname·that·is·allowed·when·putting·in·<code·class="inline">bind_address</code>.</p><h2·id="dynamic-web-pages"·class="section-heading">
185 ··<a·href="#dynamic-web-pages"·class="hover-link">185 ··<a·href="#dynamic-web-pages"·class="hover-link">
186 ····<i·class="ri-link-m"·aria-hidden="true"></i>186 ····<i·class="ri-link-m"·aria-hidden="true"></i>
187 ··</a>187 ··</a>
188 ··<span·class="text">Dynamic·Web·Pages</span>188 ··<span·class="text">Dynamic·Web·Pages</span>
189 </h2>189 </h2>
190 <p><a·href=""·id="dynamic_we_pages"></a></p><p><code·class="inline">Inets</code>·HTTP·server·provides·two·ways·of·creating·dynamic·web·pages,·each·with190 <p><a·href=""·id="dynamic_we_pages"></a></p><p><code·class="inline">Inets</code>·HTTP·server·provides·two·ways·of·creating·dynamic·web·pages,·each·with
Offset 301, 36 lines modifiedOffset 301, 36 lines modified
301 files,·Dets·databases·as·well·as·Mnesia·databases.</p><p>Uses·the·following·Erlang·Web·Server·API·interaction·data:</p><ul><li><code·class="inline">real_name</code>·-·from·<a·href="mod_alias.html"><code·class="inline">mod_alias</code></a></li></ul><p>Exports·the·following·Erlang·Web·Server·API·interaction·data:</p><ul><li><strong><code·class="inline">{remote_user,·User}</code></strong>·-·The·username·used·for·authentication.</li></ul><h4>Mnesia·As·Authentication·Database</h4><p>If·Mnesia·is·used·as·storage·method,·Mnesia·must·be·started·before·the·HTTP301 files,·Dets·databases·as·well·as·Mnesia·databases.</p><p>Uses·the·following·Erlang·Web·Server·API·interaction·data:</p><ul><li><code·class="inline">real_name</code>·-·from·<a·href="mod_alias.html"><code·class="inline">mod_alias</code></a></li></ul><p>Exports·the·following·Erlang·Web·Server·API·interaction·data:</p><ul><li><strong><code·class="inline">{remote_user,·User}</code></strong>·-·The·username·used·for·authentication.</li></ul><h4>Mnesia·As·Authentication·Database</h4><p>If·Mnesia·is·used·as·storage·method,·Mnesia·must·be·started·before·the·HTTP
302 server.·The·first·time·Mnesia·is·started,·the·schema·and·the·tables·must·be302 server.·The·first·time·Mnesia·is·started,·the·schema·and·the·tables·must·be
303 created·before·Mnesia·is·started.·A·simple·example·of·a·module·with·two303 created·before·Mnesia·is·started.·A·simple·example·of·a·module·with·two
304 functions·that·creates·and·start·Mnesia·is·provided·here.·Function304 functions·that·creates·and·start·Mnesia·is·provided·here.·Function
305 <code·class="inline">first_start/0</code>·is·to·be·used·the·first·time.·It·creates·the·schema·and·the305 <code·class="inline">first_start/0</code>·is·to·be·used·the·first·time.·It·creates·the·schema·and·the
306 tables.·<code·class="inline">start/0</code>·is·to·be·used·in·consecutive·startups.·<code·class="inline">start/0</code>·starts·Mnesia306 tables.·<code·class="inline">start/0</code>·is·to·be·used·in·consecutive·startups.·<code·class="inline">start/0</code>·starts·Mnesia
307 and·waits·for·the·tables·to·be·initiated.·This·function·must·only·be·used·when307 and·waits·for·the·tables·to·be·initiated.·This·function·must·only·be·used·when
308 the·schema·and·the·tables·are·already·created.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9680050181-1">(</span><span·class="ss">mnesia_test</span><span·class="p"·data-group-id="9680050181-1">)</span><span·class="p">.</span><span·class="w"> 
309 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9680050181-2">(</span><span·class="p"·data-group-id="9680050181-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class[·...·truncated·by·diffoscope;·len:·191,·SHA:·a031669c4421ee51c02d660233f8c252fe97351cd1baaf0b5da5fcf0237b88c9·...·]">)</span><span·class="p">.</span><span·class="w">308 the·schema·and·the·tables·are·already·created.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6955678993-1">(</span><span·class="ss">mnesia_test</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·27,·SHA:·66eee9ec2678de380e0ec441d8a4d75271e72cd5743b466a1f33eda95d94bd96·...·]">)</span><span·class="p">.</span><span·class="w">
 309 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6955678993-2">(</span><span·class="p"·data-group-id="6955678993-3">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">load_data</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6955678993-3">]</span><span·class="p"·data-group-id="6955678993-2">)</span><span·class="p">.</span><span·class="w">
310 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9680050181-4">(</span><span·class="s">&quot;mod_auth.hrl&quot;</span><span·class="p"·data-group-id="9680050181-4">)</span><span·class="p">.</span><span·class="w">310 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6955678993-4">(</span><span·class="s">&quot;mod_auth.hrl&quot;</span><span·class="p"·data-group-id="6955678993-4">)</span><span·class="p">.</span><span·class="w">
  
311 </span><span·class="nf">first_start</span><span·class="p"·data-group-id="9680050181-5">(</span><span·class="p"·data-group-id="9680050181-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">311 </span><span·class="nf">first_start</span><span·class="p"·data-group-id="6955678993-5">(</span><span·class="p"·data-group-id="6955678993-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
312 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="9680050181-6">(</span><span·class="p"·data-group-id="9680050181-7">[</span><span·class="nf">node</span><span·class="p"·data-group-id="9680050181-8">(</span><span·class="p"·data-group-id="9680050181-8">)</span><span·class="p"·data-group-id="9680050181-7">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·b3617f663acd2fb809da63444995d84640983c7534043b009a9c4cb31e4ed67a·...·]-6">)</span><span·class="p">,</span><span·class="w">312 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="6955678993-6">(</span><span·class="p"·data-group-id="6955678993-7">[</span><span·class="nf">node</span><span·class="p"·data-group-id="6955678993-8">(</span><span·class="p"·data-group-id="6955678993-8">)</span><span·class="p"·data-group-id="6955678993-7">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·0d0a136ccd937755dbbf4ce0074cfcff6bbd0403865a5c635a1427640a321cc4·...·]-6">)</span><span·class="p">,</span><span·class="w">
313 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9680050181-9">(</span><span·class="p"·data-group-id="9680050181-9">)</span><span·class="p">,</span><span·class="w">313 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6955678993-9">(</span><span·class="p"·data-group-id="6955678993-9">)</span><span·class="p">,</span><span·class="w">
314 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="9680050181-10">(</span><span·class="ss">httpd_user</span><span·class="p">,</span><span·class="w">314 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="6955678993-10">(</span><span·class="ss">httpd_user</span><span·class="p">,</span><span·class="w">
315 ························</span><span·class="p"·data-group-id="9680050181-11">[</span><span·class="p"·data-group-id="9680050181-12">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bag</span><span·class="p"·data-group-id="9680050181-12">}</span><span·class="p">,</span><span·class="w">315 ························</span><span·class="p"·data-group-id="6955678993-11">[</span><span·class="p"·data-group-id="6955678993-12">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bag</span><span·class="p"·data-group-id="6955678993-12">}</span><span·class="p">,</span><span·class="w">
316 ·························</span><span·class="p"·data-group-id="9680050181-13">{</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9680050181-14">[</span><span·class="nf">node</span><span·class="p"·data-group-id="9680050181-15">(</span><span·class="p[·...·truncated·by·diffoscope;·len:·135,·SHA:·b8e457d368d84a8d50239c75adce6e54d174ab28d0fad28e24996bb4b13a5c5f·...·]-13">}</span><span·class="p">,</span><span·class="w">316 ·························</span><span·class="p"·data-group-id="6955678993-13">{</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6955678993-14">[</span><span·class="nf">node</span><span·class="p"·data-group-id="6955678993-15">(</span><span·class="p[·...·truncated·by·diffoscope;·len:·135,·SHA:·a15c3852d65c8865a501107806513612008108404860ae43e42760b7c8171f0d·...·]-13">}</span><span·class="p">,</span><span·class="w">
317 ·························</span><span·class="p"·data-group-id="9680050181-16">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="9680050181-17">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">317 ·························</span><span·class="p"·data-group-id="6955678993-16">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="6955678993-17">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">
318 ··················································</span><span·class="ss">httpd_user</span><span·class="p"·data-group-id="9680050181-17">)</span><span·class="p"·data-group-id="9680050181-16">}</span><span·class="p"·data-group-id="9680050181-11">]</span><span·class="p"·data-group-id="9680050181-10">)</span><span·class="p">,</span><span·class="w">318 ··················································</span><span·class="ss">httpd_user</span><span·class="p"·data-group-id="6955678993-17">)</span><span·class="p"·data-group-id="6955678993-16">}</span><span·class="p"·data-group-id="6955678993-11">]</span><span·class="p"·data-group-id="6955678993-10">)</span><span·class="p">,</span><span·class="w">
319 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="9680050181-18">(</span><span·class="ss">httpd_group</span><span·class="p">,</span><span·class="w">319 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="6955678993-18">(</span><span·class="ss">httpd_group</span><span·class="p">,</span><span·class="w">
320 ························</span><span·class="p"·data-group-id="9680050181-19">[</span><span·class="p"·data-group-id="9680050181-20">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bag</span><span·class="p"·data-group-id="9680050181-20">}</span><span·class="p">,</span><span·class="w">320 ························</span><span·class="p"·data-group-id="6955678993-19">[</span><span·class="p"·data-group-id="6955678993-20">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bag</span><span·class="p"·data-group-id="6955678993-20">}</span><span·class="p">,</span><span·class="w">
321 ·························</span><span·class="p"·data-group-id="9680050181-21">{</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9680050181-22">[</span><span·class="nf">node</span><span·class="p"·data-group-id="9680050181-23">(</span><span·class="p[·...·truncated·by·diffoscope;·len:·135,·SHA:·35be1a796bfe8b4c7c16f2fc128d9a15af1b4a84d5e96f49934615a05222a1ef·...·]-21">}</span><span·class="p">,</span><span·class="w">321 ·························</span><span·class="p"·data-group-id="6955678993-21">{</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6955678993-22">[</span><span·class="nf">node</span><span·class="p"·data-group-id="6955678993-23">(</span><span·class="p[·...·truncated·by·diffoscope;·len:·135,·SHA:·a134f55e3a99cac05eeceb4e3a6b28f1cf82dfd659d16e7538f323df7abd0327·...·]-21">}</span><span·class="p">,</span><span·class="w">
322 ·························</span><span·class="p"·data-group-id="9680050181-24">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="9680050181-25">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">322 ·························</span><span·class="p"·data-group-id="6955678993-24">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="6955678993-25">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">
323 ··················································</span><span·class="ss">httpd_group</span><span·class="p"·data-group-id="9680050181-25">)</span><span·class="p"·data-group-id="9680050181-24">}</span><span·class="p"·data-group-id="9680050181-19">]</span><span·class="p"·data-group-id="9680050181-18">)</span><span·class="p">,</span><span·class="w">323 ··················································</span><span·class="ss">httpd_group</span><span·class="p"·data-group-id="6955678993-25">)</span><span·class="p"·data-group-id="6955678993-24">}</span><span·class="p"·data-group-id="6955678993-19">]</span><span·class="p"·data-group-id="6955678993-18">)</span><span·class="p">,</span><span·class="w">
324 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">wait_for_tables</span><span·class="p"·data-group-id="9680050181-26">(</span><span·class="p"·data-group-id="9680050181-27">[</span><span·class="ss">httpd_user</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd_group</span><span·class="p"·data-group-id="9680050181-27">]</span><span·cl[·...·truncated·by·diffoscope;·len:·110,·SHA:·6946ba7b814de7583a7b732404e689610672b844e8854f2d73166757689433a6·...·]-26">)</span><span·class="p">.</span><span·class="w">324 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">wait_for_tables</span><span·class="p"·data-group-id="6955678993-26">(</span><span·class="p"·data-group-id="6955678993-27">[</span><span·class="ss">httpd_user</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd_group</span><span·class="p"·data-group-id="6955678993-27">]</span><span·cl[·...·truncated·by·diffoscope;·len:·110,·SHA:·b0ef861733ec1795381f2b1dd55a5397b5cefb72e6172deb70c7f711dacd712a·...·]-26">)</span><span·class="p">.</span><span·class="w">
  
325 </span><span·class="nf">start</span><span·class="p"·data-group-id="9680050181-28">(</span><span·class="p"·data-group-id="9680050181-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">325 </span><span·class="nf">start</span><span·class="p"·data-group-id="6955678993-28">(</span><span·class="p"·data-group-id="6955678993-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
326 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9680050181-29">(</span><span·class="p"·data-group-id="9680050181-29">)</span><span·class="p">,</span><span·class="w">326 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6955678993-29">(</span><span·class="p"·data-group-id="6955678993-29">)</span><span·class="p">,</span><span·class="w">
327 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">wait_for_tables</span><span·class="p"·data-group-id="9680050181-30">(</span><span·class="p"·data-group-id="9680050181-31">[</span><span·class="ss">httpd_user</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd_group</span><span·class="p"·data-group-id="9680050181-31">]</span><span·cl[·...·truncated·by·diffoscope;·len:·110,·SHA:·6946ba7b814de7583a7b732404e689610672b844e8854f2d73166757689433a6·...·]-30">)</span><span·class="p">.</span></code></pre><p>To·create·the·Mnesia·tables,·we·use·two·records·defined·in·<code·class="inline">mod_auth.hrl</code>,·so327 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">wait_for_tables</span><span·class="p"·data-group-id="6955678993-30">(</span><span·class="p"·data-group-id="6955678993-31">[</span><span·class="ss">httpd_user</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd_group</span><span·class="p"·data-group-id="6955678993-31">]</span><span·cl[·...·truncated·by·diffoscope;·len:·110,·SHA:·b0ef861733ec1795381f2b1dd55a5397b5cefb72e6172deb70c7f711dacd712a·...·]-30">)</span><span·class="p">.</span></code></pre><p>To·create·the·Mnesia·tables,·we·use·two·records·defined·in·<code·class="inline">mod_auth.hrl</code>,·so
328 that·file·must·be·included.·<code·class="inline">first_start/0</code>·creates·a·schema·that·specifies·on328 that·file·must·be·included.·<code·class="inline">first_start/0</code>·creates·a·schema·that·specifies·on
329 which·nodes·the·database·is·to·reside.·Then·it·starts·Mnesia·and·creates·the329 which·nodes·the·database·is·to·reside.·Then·it·starts·Mnesia·and·creates·the
330 tables.·The·first·argument·is·the·name·of·the·tables,·the·second·argument·is·a330 tables.·The·first·argument·is·the·name·of·the·tables,·the·second·argument·is·a
331 list·of·options·of·how·to·create·the·table,·see·<a·href="../../../../lib/mnesia-4.23.5/doc/html/mnesia.html"><code·class="inline">mnesia</code></a>,·documentation·for331 list·of·options·of·how·to·create·the·table,·see·<a·href="../../../../lib/mnesia-4.23.5/doc/html/mnesia.html"><code·class="inline">mnesia</code></a>,·documentation·for
332 more·information.·As·the·implementation·of·the·<code·class="inline">mod_auth_mnesia</code>·saves·one·row332 more·information.·As·the·implementation·of·the·<code·class="inline">mod_auth_mnesia</code>·saves·one·row
333 for·each·user,·the·type·must·be·<code·class="inline">bag</code>.·When·the·schema·and·the·tables·are333 for·each·user,·the·type·must·be·<code·class="inline">bag</code>.·When·the·schema·and·the·tables·are
334 created,·function·<a·href="../../../../lib/mnesia-4.23.5/doc/html/mnesia.html#start/0"><code·class="inline">mnesia:start/0</code></a>·is·used·to·start·Mnesia·and·waits·for·the334 created,·function·<a·href="../../../../lib/mnesia-4.23.5/doc/html/mnesia.html#start/0"><code·class="inline">mnesia:start/0</code></a>·is·used·to·start·Mnesia·and·waits·for·the
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481 ······<p·class="built-using">481 ······<p·class="built-using">
482 ········Built·using482 ········Built·using
483 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the483 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
484 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>484 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
485 ······</p>485 ······</p>
486 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>486 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
487 ····</footer>487 ····</footer>
488 ··</div>488 ··</div>
489 </main>489 </main>
490 </div>490 </div>
491 <script>491 <script>
492 ··function·mermaidLoaded()·{492 ··function·mermaidLoaded()·{
493 ····mermaid.initialize({493 ····mermaid.initialize({
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277 ······<p·class="built-using">277 ······<p·class="built-using">
278 ········Built·using278 ········Built·using
279 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the279 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
280 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>280 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
281 ······</p>281 ······</p>
282 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>282 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
283 ····</footer>283 ····</footer>
284 ··</div>284 ··</div>
285 </main>285 </main>
286 </div>286 </div>
287 <script>287 <script>
288 ··function·mermaidLoaded()·{288 ··function·mermaidLoaded()·{
289 ····mermaid.initialize({289 ····mermaid.initialize({
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1037 options.</p></section><p>By·default·the·socket·options·set·by·function1037 options.</p></section><p>By·default·the·socket·options·set·by·function
1038 <a·href="#set_options/1">set_options/1,2</a>·are·used·when·establishing·a·connection.</p></li><li><p><strong><code·class="inline">receiver</code></strong>·-·Defines·how·the·client·delivers·the·result·of·an·asynchronous1038 <a·href="#set_options/1">set_options/1,2</a>·are·used·when·establishing·a·connection.</p></li><li><p><strong><code·class="inline">receiver</code></strong>·-·Defines·how·the·client·delivers·the·result·of·an·asynchronous
1039 request·(<code·class="inline">sync</code>·has·the·value·<code·class="inline">false</code>).</p><ul><li><p><strong><a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pid/0"><code·class="inline">pid/0</code></a></strong>·-·Messages·are·sent·to·this·process·in·the·format1039 request·(<code·class="inline">sync</code>·has·the·value·<code·class="inline">false</code>).</p><ul><li><p><strong><a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pid/0"><code·class="inline">pid/0</code></a></strong>·-·Messages·are·sent·to·this·process·in·the·format
1040 <code·class="inline">{http,·ReplyInfo}</code>.</p></li><li><p><strong><a·href="../../../../erts-15.2.6/doc/html/erlang.html#alias/0"><code·class="inline">alias/0</code></a></strong>·-·Messages·are·sent·to·this·special·reference·in·the·format1040 <code·class="inline">{http,·ReplyInfo}</code>.</p></li><li><p><strong><a·href="../../../../erts-15.2.6/doc/html/erlang.html#alias/0"><code·class="inline">alias/0</code></a></strong>·-·Messages·are·sent·to·this·special·reference·in·the·format
1041 <code·class="inline">{http,·ReplyInfo}</code>.</p></li><li><p><strong><code·class="inline">function/1</code></strong>·-·Information·is·delivered·to·the·receiver·through·calls·to1041 <code·class="inline">{http,·ReplyInfo}</code>.</p></li><li><p><strong><code·class="inline">function/1</code></strong>·-·Information·is·delivered·to·the·receiver·through·calls·to
1042 the·provided·fun·<code·class="inline">Receiver(ReplyInfo)</code>.</p></li><li><p><strong><code·class="inline">{Module,·Function,·Args}</code></strong>·-·Information·is·delivered·to·the·receiver1042 the·provided·fun·<code·class="inline">Receiver(ReplyInfo)</code>.</p></li><li><p><strong><code·class="inline">{Module,·Function,·Args}</code></strong>·-·Information·is·delivered·to·the·receiver
1043 through·calls·to·the·callback·function1043 through·calls·to·the·callback·function
1044 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(Module,·Function,·[ReplyInfo·|·Args])</code></a>.</p></li></ul><p>In·all·of·these·cases,·<code·class="inline">ReplyInfo</code>·has·the·following·structure:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="p"·data-group-id="8018446260-1">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">saved_to_file</span><span·class="p"·data-group-id="8018446260-1">}</span><span·class="w">1044 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(Module,·Function,·[ReplyInfo·|·Args])</code></a>.</p></li></ul><p>In·all·of·these·cases,·<code·class="inline">ReplyInfo</code>·has·the·following·structure:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="p"·data-group-id="7853110322-1">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">saved_to_file</span><span·class="p"·data-group-id="7853110322-1">}</span><span·class="w">
1045 ·</span><span·class="p"·data-group-id="8018446260-2">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8018446260-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</[·...·truncated·by·diffoscope;·len:·99,·SHA:·25a926c12dd57eb7811b762fb05097b31c0dbf494517bde7d8021f1b13dddeb7·...·]-2">}</span><span·class="w">1045 ·</span><span·class="p"·data-group-id="7853110322-2">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7853110322-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</[·...·truncated·by·diffoscope;·len:·99,·SHA:·a98c2f06a9bc9225bc4b857a0ae14c3a2627609b160793170d61fe7c4f7fda88·...·]-2">}</span><span·class="w">
1046 ·</span><span·class="p"·data-group-id="8018446260-4">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="8018446260-4">}</span><span·class="w">1046 ·</span><span·class="p"·data-group-id="7853110322-4">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Result</span><span·class="p"·data-group-id="7853110322-4">}</span><span·class="w">
1047 ·</span><span·class="p"·data-group-id="8018446260-5">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream_start</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p"·data-group-id="801844626[·...·truncated·by·diffoscope;·len:·1,·SHA:·5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9·...·]-5">}</span><span·class="w">1047 ·</span><span·class="p"·data-group-id="7853110322-5">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream_start</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p"·data-group-id="785311032[·...·truncated·by·diffoscope;·len:·1,·SHA:·d4735e3a265e16eee03f59718b9b5d03019c07d8b6c51f90da3a666eec13ab35·...·]-5">}</span><span·class="w">
1048 ·</span><span·class="p"·data-group-id="8018446260-6">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream_start</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·82,·SHA:·8a3190b35cb6c5114ba4232330800ef07b67bbec2b95531c46cd1c0a65f4fc51·...·]-6">}</span><span·class="w">1048 ·</span><span·class="p"·data-group-id="7853110322-6">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream_start</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·82,·SHA:·9bec50f27854ef08101d4556a8dc591711d6be40e8b5ffc800297dbcb6c45a34·...·]-6">}</span><span·class="w">
1049 ·</span><span·class="p"·data-group-id="8018446260-7">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BinBodyPart</span><span·class="p"·data-group-id="8018446260-7">}</span><span·class="w">1049 ·</span><span·class="p"·data-group-id="7853110322-7">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BinBodyPart</span><span·class="p"·data-group-id="7853110322-7">}</span><span·class="w">
1050 ·</span><span·class="p"·data-group-id="8018446260-8">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream_end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p"·data-group-id="8018446260-8">}</span></code></pre><p>Default·is·the·<code·class="inline">pid</code>·of·the·process·calling·the·request·function·(<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>).</p><p><a·href=""·id="ipv6_host_with_brackets"></a></p></li><li><p><strong><code·class="inline">ipv6_host_with_brackets</code></strong>·-·Defines·when·parsing·the·Host-Port·part·of·an1050 ·</span><span·class="p"·data-group-id="7853110322-8">{</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stream_end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Headers</span><span·class="p"·data-group-id="7853110322-8">}</span></code></pre><p>Default·is·the·<code·class="inline">pid</code>·of·the·process·calling·the·request·function·(<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>).</p><p><a·href=""·id="ipv6_host_with_brackets"></a></p></li><li><p><strong><code·class="inline">ipv6_host_with_brackets</code></strong>·-·Defines·when·parsing·the·Host-Port·part·of·an
1051 URI·with·an·IPv6·address·with·brackets,·if·those·brackets·are·to·be·retained1051 URI·with·an·IPv6·address·with·brackets,·if·those·brackets·are·to·be·retained
1052 (<code·class="inline">true</code>)·or·stripped·(<code·class="inline">false</code>).</p><p>Default·is·<code·class="inline">false</code>.</p></li></ul>1052 (<code·class="inline">true</code>)·or·stripped·(<code·class="inline">false</code>).</p><p>Default·is·<code·class="inline">false</code>.</p></li></ul>
1053 ··</section>1053 ··</section>
1054 </section>1054 </section>
1055 <section·class="detail"·id="reset_cookies/0">1055 <section·class="detail"·id="reset_cookies/0">
  
1056 ··<div·class="detail-header">1056 ··<div·class="detail-header">
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1561 ······<p·class="built-using">1561 ······<p·class="built-using">
1562 ········Built·using1562 ········Built·using
1563 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1563 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1564 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1564 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1565 ······</p>1565 ······</p>
1566 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1566 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1567 ····</footer>1567 ····</footer>
1568 ··</div>1568 ··</div>
1569 </main>1569 </main>
1570 </div>1570 </div>
1571 <script>1571 <script>
1572 ··function·mermaidLoaded()·{1572 ··function·mermaidLoaded()·{
1573 ····mermaid.initialize({1573 ····mermaid.initialize({
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246 }</code></pre><p>An·example·of·a·log·entry·with·only·default·settings·of·logger</p><pre><code·class="text">=ERROR·REPORT====·9-Oct-2019::09:33:27.350235·===246 }</code></pre><p>An·example·of·a·log·entry·with·only·default·settings·of·logger</p><pre><code·class="text">=ERROR·REPORT====·9-Oct-2019::09:33:27.350235·===
247 ···Server:·My·Server247 ···Server:·My·Server
248 ·Protocol:·HTTP248 ·Protocol:·HTTP
249 Transport:·TLS249 Transport:·TLS
250 ······URI:·/not_there250 ······URI:·/not_there
251 ·····Host:·127.0.1.1:80251 ·····Host:·127.0.1.1:80
252 ·····Peer:·127.0.0.1:45253252 ·····Peer:·127.0.0.1:45253
253 ···Reason:·[{statuscode,404},{description,&quot;Object·Not·Found&quot;}]</code></pre><p>Using·this·option·makes·mod_log·and·mod_disk_log·error·logs·redundant.</p><p>Add·the·filter</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2720131067-1">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">253 ···Reason:·[{statuscode,404},{description,&quot;Object·Not·Found&quot;}]</code></pre><p>Using·this·option·makes·mod_log·and·mod_disk_log·error·logs·redundant.</p><p>Add·the·filter</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0548574484-1">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
254 ····</span><span·class="p"·data-group-id="2720131067-2">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="ss">equal</span><span·class="p">,</span><span·class="p"·data-group-id="2720131067-3">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="ss">inets</sp[·...·truncated·by·diffoscope;·len:·330,·SHA:·2cbdc436ac515e345f11636c34f5f822da797525f4c3bfcd1a6a599fcd38125f·...·]-2">}</span></code></pre><p>to·appropriate·logger·handler·to·handle·the·events.·For·example·to·write·the254 ····</span><span·class="p"·data-group-id="0548574484-2">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="ss">equal</span><span·class="p">,</span><span·class="p"·data-group-id="0548574484-3">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="ss">inets</sp[·...·truncated·by·diffoscope;·len:·330,·SHA:·8f1b46d9473e29640f8e4a57de3c5e53f4168ec21256e70757774def957dfd7e·...·]-2">}</span></code></pre><p>to·appropriate·logger·handler·to·handle·the·events.·For·example·to·write·the
255 error·log·from·an·httpd·server·with·a·<code·class="inline">ServerID</code>·of·<code·class="inline">my_server</code>·to·a·file255 error·log·from·an·httpd·server·with·a·<code·class="inline">ServerID</code>·of·<code·class="inline">my_server</code>·to·a·file
256 you·can·use·the·following·sys.config:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6792654946-1">[</span><span·class="p"·data-group-id="6792654946-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">256 you·can·use·the·following·sys.config:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5175466995-1">[</span><span·class="p"·data-group-id="5175466995-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
257 ·</span><span·class="p"·data-group-id="6792654946-3">[</span><span·class="p"·data-group-id="6792654946-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">257 ·</span><span·class="p"·data-group-id="5175466995-3">[</span><span·class="p"·data-group-id="5175466995-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
258 ··</span><span·class="p"·data-group-id="6792654946-5">[</span><span·class="p"·data-group-id="6792654946-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">http_error_test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">258 ··</span><span·class="p"·data-group-id="5175466995-5">[</span><span·class="p"·data-group-id="5175466995-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">http_error_test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
259 ····</span><span·class="p"·data-group-id="6792654946-7">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6792654946-8">#{</span><span·class="w">·</span><span·class="ss">file</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·173,·SHA:·80cae8660ee02abc1ba425cc50c1d225cc2b82098add21acca1c5528fd6ee543·...·]-8">}</span><span·class="p">,</span><span·class="w">259 ····</span><span·class="p"·data-group-id="5175466995-7">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5175466995-8">#{</span><span·class="w">·</span><span·class="ss">file</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·173,·SHA:·484756ed91eb1fb95f4f6d317c18c33e17884b2e535295b7b3fa1fac2aebcd2b·...·]-8">}</span><span·class="p">,</span><span·class="w">
260 ······</span><span·class="ss">filters</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6792654946-9">[</span><span·class="p"·data-group-id="6792654946-10">{</span><span·class="ss">inets_httpd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6792654946-11">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">260 ······</span><span·class="ss">filters</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5175466995-9">[</span><span·class="p"·data-group-id="5175466995-10">{</span><span·class="ss">inets_httpd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5175466995-11">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
261 ·································</span><span·class="p"·data-group-id="6792654946-12">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">equal</span><span·class="p">,</span><span·class="w">261 ·································</span><span·class="p"·data-group-id="5175466995-12">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">equal</span><span·class="p">,</span><span·class="w">
262 ··································</span><span·class="p"·data-group-id="6792654946-13">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·147,·SHA:·13afebd348f895a75e8db61d254112b8885131db5d73d11e45142fdd70aecb05·...·]-13">]</span><span·class="w">262 ··································</span><span·class="p"·data-group-id="5175466995-13">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·147,·SHA:·af585f98acdbd7060ecaa232a2b57e361c0a97680bd012bb4fcdffcb7dba9de1·...·]-13">]</span><span·class="w">
263 ·································</span><span·class="p"·data-group-id="6792654946-12">}</span><span·class="p"·data-group-id="6792654946-11">}</span><span·class="p"·data-group-id="6792654946-10">}</span><span·class="p"·data-group-id="6792654946-9">]</span><span·class="p">,</span><span·class="w">263 ·································</span><span·class="p"·data-group-id="5175466995-12">}</span><span·class="p"·data-group-id="5175466995-11">}</span><span·class="p"·data-group-id="5175466995-10">}</span><span·class="p"·data-group-id="5175466995-9">]</span><span·class="p">,</span><span·class="w">
264 ······</span><span·class="ss">filter_default</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">stop</span><span·class="w">·</span><span·class="p"·data-group-id="6792654946-7">}</span><span·class="p"·data-group-id="6792654946-6">}</span><span·class="p"·data-group-id="6792654946-5">]</span><span·class="p"·data-group-id="6792654946-4">}</span><span·class="p"·data-group-id="6792654946-3">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·369,·SHA:·a80d4f61bc6d615e54a38a2bdc63aa9fccfcf8d8e2ae6277c292ca03f872db94·...·]84-1">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">264 ······</span><span·class="ss">filter_default</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">stop</span><span·class="w">·</span><span·class="p"·data-group-id="5175466995-7">}</span><span·class="p"·data-group-id="5175466995-6">}</span><span·class="p"·data-group-id="5175466995-5">]</span><span·class="p"·data-group-id="5175466995-4">}</span><span·class="p"·data-group-id="5175466995-3">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·369,·SHA:·ea569a15111834ef7a067036f9c20b5564c2ad2ad1fbf2c83ca8f28fff2f7de7·...·]84-1">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">
265 ··························</span><span·class="ss">inets_httpd</span><span·class="p">,</span><span·class="w">265 ··························</span><span·class="ss">inets_httpd</span><span·class="p">,</span><span·class="w">
266 ··························</span><span·class="p"·data-group-id="7271759984-2">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">266 ··························</span><span·class="p"·data-group-id="9464304684-2">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
267 ···························</span><span·class="p"·data-group-id="7271759984-3">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">equal</span><span·class="p">,</span><span·class="w">267 ···························</span><span·class="p"·data-group-id="9464304684-3">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">equal</span><span·class="p">,</span><span·class="w">
268 ····························</span><span·class="p"·data-group-id="7271759984-4">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·303,·SHA:·b73951792090af589b3282f5f4ca0e76a92a035343bb37b355ff4f921d160cad·...·]84-1">)</span><span·class="p">.</span></code></pre></li></ul></li><li><p><a·href=""·id="prop_log_format"></a>·<strong><code·class="inline">{log_format,·common·|·combined}</code></strong><br/>Defines·if·access·logs·are·to·be·written·according·to·the·<code·class="inline">common</code>·log·format268 ····························</span><span·class="p"·data-group-id="9464304684-4">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">httpd</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·303,·SHA:·70da0f69db719917663c175084669501254f7a41852f36abe72886f9dfe6e961·...·]84-1">)</span><span·class="p">.</span></code></pre></li></ul></li><li><p><a·href=""·id="prop_log_format"></a>·<strong><code·class="inline">{log_format,·common·|·combined}</code></strong><br/>Defines·if·access·logs·are·to·be·written·according·to·the·<code·class="inline">common</code>·log·format
269 or·the·extended·common·log·format.·The·<code·class="inline">common</code>·format·is·one·line·looking269 or·the·extended·common·log·format.·The·<code·class="inline">common</code>·format·is·one·line·looking
270 like·this:·<code·class="inline">remotehost·rfc931·authuser·[date]·&quot;request&quot;·status·bytes</code>.</p><p>Here:</p><ul><li><p><strong><code·class="inline">remotehost</code></strong>·-·Remote.</p></li><li><p><strong><code·class="inline">rfc931</code></strong>·-·The·remote·username·of·the·client270 like·this:·<code·class="inline">remotehost·rfc931·authuser·[date]·&quot;request&quot;·status·bytes</code>.</p><p>Here:</p><ul><li><p><strong><code·class="inline">remotehost</code></strong>·-·Remote.</p></li><li><p><strong><code·class="inline">rfc931</code></strong>·-·The·remote·username·of·the·client
271 (<a·href="http://www.ietf.org/rfc/rfc931.txt">RFC·931</a>).</p></li><li><p><strong><code·class="inline">authuser</code></strong>·-·The·username·used·for·authentication.</p></li><li><p><strong><code·class="inline">[date]</code></strong>·-·Date·and·time·of·the·request271 (<a·href="http://www.ietf.org/rfc/rfc931.txt">RFC·931</a>).</p></li><li><p><strong><code·class="inline">authuser</code></strong>·-·The·username·used·for·authentication.</p></li><li><p><strong><code·class="inline">[date]</code></strong>·-·Date·and·time·of·the·request
272 (<a·href="http://www.ietf.org/rfc/rfc1123.txt">RFC·1123</a>).</p></li><li><p><strong><code·class="inline">&quot;request&quot;</code></strong>·-·The·request·line·as·it·came·from·the·client272 (<a·href="http://www.ietf.org/rfc/rfc1123.txt">RFC·1123</a>).</p></li><li><p><strong><code·class="inline">&quot;request&quot;</code></strong>·-·The·request·line·as·it·came·from·the·client
273 (<a·href="http://www.ietf.org/rfc/rfc1945.txt">RFC·1945</a>).</p></li><li><p><strong><code·class="inline">status</code></strong>·-·The·HTTP·status·code·returned·to·the·client273 (<a·href="http://www.ietf.org/rfc/rfc1945.txt">RFC·1945</a>).</p></li><li><p><strong><code·class="inline">status</code></strong>·-·The·HTTP·status·code·returned·to·the·client
274 (<a·href="http://www.ietf.org/rfc/rfc1945.txt">RFC·1945</a>).</p></li><li><p><strong><code·class="inline">bytes</code></strong>·-·The·content-length·of·the·document·transferred.</p></li></ul><p>The·<code·class="inline">combined</code>·format·is·one·line·looking·like·this:274 (<a·href="http://www.ietf.org/rfc/rfc1945.txt">RFC·1945</a>).</p></li><li><p><strong><code·class="inline">bytes</code></strong>·-·The·content-length·of·the·document·transferred.</p></li></ul><p>The·<code·class="inline">combined</code>·format·is·one·line·looking·like·this:
275 <code·class="inline">remotehost·rfc931·authuser·[date]·&quot;request&quot;·status·bytes·&quot;referer&quot;·&quot;user_agent&quot;</code></p><p>In·addition·to·the·earlier:</p><ul><li><p><strong><code·class="inline">&quot;referer&quot;</code></strong>·-·The·URL·the·client·was·on·before·requesting·the·URL·(if·it275 <code·class="inline">remotehost·rfc931·authuser·[date]·&quot;request&quot;·status·bytes·&quot;referer&quot;·&quot;user_agent&quot;</code></p><p>In·addition·to·the·earlier:</p><ul><li><p><strong><code·class="inline">&quot;referer&quot;</code></strong>·-·The·URL·the·client·was·on·before·requesting·the·URL·(if·it
276 could·not·be·determined,·a·minus·sign·is·placed·in·this·field).</p></li><li><p><strong><code·class="inline">&quot;user_agent&quot;</code></strong>·-·The·software·the·client·claims·to·be·using·(if·it·could276 could·not·be·determined,·a·minus·sign·is·placed·in·this·field).</p></li><li><p><strong><code·class="inline">&quot;user_agent&quot;</code></strong>·-·The·software·the·client·claims·to·be·using·(if·it·could
277 not·be·determined,·a·minus·sign·is·placed·in·this·field).</p></li></ul><p>This·affects·the·access·logs·written·by·<code·class="inline">mod_log</code>·and·<code·class="inline">mod_disk_log</code>.</p></li><li><p><a·href=""·id="prop_elog_format"></a>·<strong><code·class="inline">{error_log_format,·pretty·|·compact}</code></strong><br/>Default·is·<code·class="inline">pretty</code>.·If·the·error·log·is·meant·to·be·read·directly·by·a·human,277 not·be·determined,·a·minus·sign·is·placed·in·this·field).</p></li></ul><p>This·affects·the·access·logs·written·by·<code·class="inline">mod_log</code>·and·<code·class="inline">mod_disk_log</code>.</p></li><li><p><a·href=""·id="prop_elog_format"></a>·<strong><code·class="inline">{error_log_format,·pretty·|·compact}</code></strong><br/>Default·is·<code·class="inline">pretty</code>.·If·the·error·log·is·meant·to·be·read·directly·by·a·human,
278 <code·class="inline">pretty</code>·is·the·best·option.</p><p><code·class="inline">pretty</code>·has·a·format·corresponding·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6058560532-1">(</span><span·class="s">&quot;[</span><span·class="si">~s</span><span·class="s">]·</span><span·class="si">~s</span><span·class="s">,·reason:·</span><span·class="si">~n</span><span·class="s">·</span><span·class="si">~p</span><span·class="s">·</s[·...·truncated·by·diffoscope;·len:·1379,·SHA:·479dee38b0015995f3028e93f22e4a7176de50078941da46d2320fde9e90256c·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·affects·the·error·logs·written·by·<code·class="inline">mod_log</code>·and·<code·class="inline">mod_disk_log</code>.</p></li></ul><p><a·href=""·id="props_alias"></a></p><h3·id="module-url-aliasing-properties-requires-mod_alias"·class="section-heading">278 <code·class="inline">pretty</code>·is·the·best·option.</p><p><code·class="inline">pretty</code>·has·a·format·corresponding·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6019812390-1">(</span><span·class="s">&quot;[</span><span·class="si">~s</span><span·class="s">]·</span><span·class="si">~s</span><span·class="s">,·reason:·</span><span·class="si">~n</span><span·class="s">·</span><span·class="si">~p</span><span·class="s">·</s[·...·truncated·by·diffoscope;·len:·1379,·SHA:·6f9033f8b12aa8e208d3c3288ad1fcbfa48dee4e8c9d086e3bb0649e0543517f·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·affects·the·error·logs·written·by·<code·class="inline">mod_log</code>·and·<code·class="inline">mod_disk_log</code>.</p></li></ul><p><a·href=""·id="props_alias"></a></p><h3·id="module-url-aliasing-properties-requires-mod_alias"·class="section-heading">
279 ··<a·href="#module-url-aliasing-properties-requires-mod_alias"·class="hover-link">279 ··<a·href="#module-url-aliasing-properties-requires-mod_alias"·class="hover-link">
280 ····<i·class="ri-link-m"·aria-hidden="true"></i>280 ····<i·class="ri-link-m"·aria-hidden="true"></i>
281 ··</a>281 ··</a>
282 ··<span·class="text">URL·Aliasing·Properties·-·Requires·mod_alias</span>282 ··<span·class="text">URL·Aliasing·Properties·-·Requires·mod_alias</span>
283 </h3>283 </h3>
284 <ul><li><p><a·href=""·id="prop_alias"></a>·<strong><code·class="inline">{alias,·{Alias,·RealName}}</code></strong><br/><code·class="inline">Alias·=·string()</code>·and·<code·class="inline">RealName·=·string()</code>.·<code·class="inline">alias</code>·allows·documents·to·be284 <ul><li><p><a·href=""·id="prop_alias"></a>·<strong><code·class="inline">{alias,·{Alias,·RealName}}</code></strong><br/><code·class="inline">Alias·=·string()</code>·and·<code·class="inline">RealName·=·string()</code>.·<code·class="inline">alias</code>·allows·documents·to·be
285 stored·in·the·local·file·system·instead·of·the·<code·class="inline">document_root</code>·location.·URLs285 stored·in·the·local·file·system·instead·of·the·<code·class="inline">document_root</code>·location.·URLs
286 with·a·path·beginning·with·url-path·is·mapped·to·local·files·beginning·with286 with·a·path·beginning·with·url-path·is·mapped·to·local·files·beginning·with
287 directory-filename,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2122009117-1">{</span><span·class="ss">alias</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2122009117-2">{</span><span·class="s">&quot;/image&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s"[·...·truncated·by·diffoscope;·len:·128,·SHA:·8d2b65105dc32a0e052bd2e105815750948566abd7311faad91cc2169488827d·...·]-1">}</span></code></pre><p>Access·to·<a·href="http://your.server.org/image/foo.gif">http://your.server.org/image/foo.gif</a>·would·refer·to·the·file287 directory-filename,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4473562211-1">{</span><span·class="ss">alias</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4473562211-2">{</span><span·class="s">&quot;/image&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s"[·...·truncated·by·diffoscope;·len:·128,·SHA:·77c2088b5c423badb789a03e456a269d1935828e1fb4162e5e85a1371c466575·...·]-1">}</span></code></pre><p>Access·to·<a·href="http://your.server.org/image/foo.gif">http://your.server.org/image/foo.gif</a>·would·refer·to·the·file
288 /ftp/pub/image/foo.gif.</p></li><li><p><a·href=""·id="prop_re_write"></a>·<strong><code·class="inline">{re_write,·{Re,·Replacement}}</code></strong><br/><code·class="inline">Re·=·string()</code>·and·<code·class="inline">Replacement·=·string()</code>.·<code·class="inline">re_write</code>·allows·documents·to288 /ftp/pub/image/foo.gif.</p></li><li><p><a·href=""·id="prop_re_write"></a>·<strong><code·class="inline">{re_write,·{Re,·Replacement}}</code></strong><br/><code·class="inline">Re·=·string()</code>·and·<code·class="inline">Replacement·=·string()</code>.·<code·class="inline">re_write</code>·allows·documents·to
289 be·stored·in·the·local·file·system·instead·of·the·<code·class="inline">document_root</code>·location.289 be·stored·in·the·local·file·system·instead·of·the·<code·class="inline">document_root</code>·location.
290 URLs·are·rewritten·by·<a·href="../../../../lib/stdlib-6.2.2/doc/html/re.html#replace/3"><code·class="inline">re:replace/3</code></a>·to·produce·a·path·in·the·local290 URLs·are·rewritten·by·<a·href="../../../../lib/stdlib-6.2.2/doc/html/re.html#replace/3"><code·class="inline">re:replace/3</code></a>·to·produce·a·path·in·the·local
291 file-system,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2415003948-1">{</span><span·class="ss">re_write</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2415003948-2">{</span><span·class="s">&quot;^/[~]([^/]+)(.*)$&quot;</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·147,·SHA:·82f9c999ebbaa9114052b4904b05786874a8207c17c53b528aba53d11662043e·...·]-1">}</span></code></pre><p>Access·to·<a·href="http://your.server.org/~bob/foo.gif">http://your.server.org/~bob/foo.gif</a>·would·refer·to·the·file291 file-system,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8121146319-1">{</span><span·class="ss">re_write</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8121146319-2">{</span><span·class="s">&quot;^/[~]([^/]+)(.*)$&quot;</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·147,·SHA:·65565a19b2f757129a0345e8cba2348aef3e05f87e672c4e7ecc697bb8729e50·...·]-1">}</span></code></pre><p>Access·to·<a·href="http://your.server.org/~bob/foo.gif">http://your.server.org/~bob/foo.gif</a>·would·refer·to·the·file
292 /home/bob/public/foo.gif.</p></li><li><p><a·href=""·id="prop_dir_idx"></a>·<strong><code·class="inline">{directory_index,·[string()]}</code></strong><br/><code·class="inline">directory_index</code>·specifies·a·list·of·resources·to·look·for·if·a·client292 /home/bob/public/foo.gif.</p></li><li><p><a·href=""·id="prop_dir_idx"></a>·<strong><code·class="inline">{directory_index,·[string()]}</code></strong><br/><code·class="inline">directory_index</code>·specifies·a·list·of·resources·to·look·for·if·a·client
293 requests·a·directory·using·a·<code·class="inline">/</code>·at·the·end·of·the·directory·name.·<code·class="inline">file</code>293 requests·a·directory·using·a·<code·class="inline">/</code>·at·the·end·of·the·directory·name.·<code·class="inline">file</code>
294 depicts·the·name·of·a·file·in·the·directory.·Several·files·can·be·given,·in294 depicts·the·name·of·a·file·in·the·directory.·Several·files·can·be·given,·in
295 which·case·the·server·returns·the·first·it·finds,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0990373662-1">{</span><span·class="ss">directory_index</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0990373662-2">[</span><span·class="s">&quot;index.html&quot;</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·140,·SHA:·9bbdbbfa7b6c7432f951f1ce8a155c5d7b0c7da9fc91145b81337c0af2e29604·...·]-1">}</span></code></pre><p>Access·to·<a·href="http://your.server.org/docs/">http://your.server.org/docs/</a>·would·return295 which·case·the·server·returns·the·first·it·finds,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6163481349-1">{</span><span·class="ss">directory_index</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6163481349-2">[</span><span·class="s">&quot;index.html&quot;</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·140,·SHA:·714074d6c9ca57fc0de61677bf52c53356374c3405542daec30b5ae3fa4ff7fb·...·]-1">}</span></code></pre><p>Access·to·<a·href="http://your.server.org/docs/">http://your.server.org/docs/</a>·would·return
296 <a·href="http://your.server.org/docs/index.html">http://your.server.org/docs/index.html</a>·or296 <a·href="http://your.server.org/docs/index.html">http://your.server.org/docs/index.html</a>·or
297 <a·href="http://your.server.org/docs/welcome.html">http://your.server.org/docs/welcome.html</a>·if·index.html·does·not·exist.</p></li></ul><p><a·href=""·id="props_cgi"></a></p><h3·id="module-cgi-properties-requires-mod_cgi"·class="section-heading">297 <a·href="http://your.server.org/docs/welcome.html">http://your.server.org/docs/welcome.html</a>·if·index.html·does·not·exist.</p></li></ul><p><a·href=""·id="props_cgi"></a></p><h3·id="module-cgi-properties-requires-mod_cgi"·class="section-heading">
298 ··<a·href="#module-cgi-properties-requires-mod_cgi"·class="hover-link">298 ··<a·href="#module-cgi-properties-requires-mod_cgi"·class="hover-link">
299 ····<i·class="ri-link-m"·aria-hidden="true"></i>299 ····<i·class="ri-link-m"·aria-hidden="true"></i>
300 ··</a>300 ··</a>
301 ··<span·class="text">CGI·Properties·-·Requires·mod_cgi</span>301 ··<span·class="text">CGI·Properties·-·Requires·mod_cgi</span>
302 </h3>302 </h3>
Offset 316, 23 lines modifiedOffset 316, 23 lines modified
316 activating·a·CGI·script·whenever·a·file·of·a·certain·MIME·type·is·requested.316 activating·a·CGI·script·whenever·a·file·of·a·certain·MIME·type·is·requested.
317 It·propagates·the·URL·and·file·path·of·the·requested·document·using·the317 It·propagates·the·URL·and·file·path·of·the·requested·document·using·the
318 standard·CGI·PATH_INFO·and·PATH_TRANSLATED·environment·variables.</p><p>Example:</p><pre><code·class="text">{action,·{&quot;text/plain&quot;,·&quot;/cgi-bin/log_and_deliver_text&quot;}}</code></pre></li><li><p><a·href=""·id="prop_script"></a>·<strong><code·class="inline">{script,·{Method,·CgiScript}}</code></strong>·-·requires·<code·class="inline">mod_actions</code><br/><code·class="inline">Method·=·string()</code>·and·<code·class="inline">CgiScript·=·string()</code>.·<code·class="inline">script</code>·adds·an·action318 standard·CGI·PATH_INFO·and·PATH_TRANSLATED·environment·variables.</p><p>Example:</p><pre><code·class="text">{action,·{&quot;text/plain&quot;,·&quot;/cgi-bin/log_and_deliver_text&quot;}}</code></pre></li><li><p><a·href=""·id="prop_script"></a>·<strong><code·class="inline">{script,·{Method,·CgiScript}}</code></strong>·-·requires·<code·class="inline">mod_actions</code><br/><code·class="inline">Method·=·string()</code>·and·<code·class="inline">CgiScript·=·string()</code>.·<code·class="inline">script</code>·adds·an·action
319 activating·a·CGI·script·whenever·a·file·is·requested·using·a·certain·HTTP319 activating·a·CGI·script·whenever·a·file·is·requested·using·a·certain·HTTP
320 method.·The·method·is·either·GET·or·POST,·as·defined·in320 method.·The·method·is·either·GET·or·POST,·as·defined·in
321 <a·href="http://www.ietf.org/rfc/rfc1945.txt">RFC·1945</a>.·It·propagates·the·URL·and321 <a·href="http://www.ietf.org/rfc/rfc1945.txt">RFC·1945</a>.·It·propagates·the·URL·and
322 file·path·of·the·requested·document·using·the·standard·CGI·PATH_INFO·and322 file·path·of·the·requested·document·using·the·standard·CGI·PATH_INFO·and
323 PATH_TRANSLATED·environment·variables.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0899529694-1">{</span><span·class="ss">script</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0899529694-2">{</span><span·class="s">&quot;PUT&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·124,·SHA:·802ac90832f6720c7f9072846f8b2c9c9e5fc76fcf5936e9247bae9c0c42b8d1·...·]-1">}</span></code></pre></li></ul><p><a·href=""·id="props_esi"></a></p><h3·id="module-esi-properties-requires-mod_esi"·class="section-heading">323 PATH_TRANSLATED·environment·variables.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8099827636-1">{</span><span·class="ss">script</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8099827636-2">{</span><span·class="s">&quot;PUT&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·124,·SHA:·f43fabe91be3e4b8e36cf5ea917bba4038eeeb9c610d30ac371a89c1bf8bfa0b·...·]-1">}</span></code></pre></li></ul><p><a·href=""·id="props_esi"></a></p><h3·id="module-esi-properties-requires-mod_esi"·class="section-heading">
324 ··<a·href="#module-esi-properties-requires-mod_esi"·class="hover-link">324 ··<a·href="#module-esi-properties-requires-mod_esi"·class="hover-link">
325 ····<i·class="ri-link-m"·aria-hidden="true"></i>325 ····<i·class="ri-link-m"·aria-hidden="true"></i>
326 ··</a>326 ··</a>
327 ··<span·class="text">ESI·Properties·-·Requires·mod_esi</span>327 ··<span·class="text">ESI·Properties·-·Requires·mod_esi</span>
328 </h3>328 </h3>
329 <ul><li><p><a·href=""·id="prop_esi_alias"></a>·<strong><code·class="inline">{erl_script_alias,·{URLPath,·[AllowedModule]}}</code></strong><br/><code·class="inline">URLPath·=·string()</code>·and·<code·class="inline">AllowedModule·=·atom()</code>.·<code·class="inline">erl_script_alias</code>·marks329 <ul><li><p><a·href=""·id="prop_esi_alias"></a>·<strong><code·class="inline">{erl_script_alias,·{URLPath,·[AllowedModule]}}</code></strong><br/><code·class="inline">URLPath·=·string()</code>·and·<code·class="inline">AllowedModule·=·atom()</code>.·<code·class="inline">erl_script_alias</code>·marks
330 all·URLs·matching·url-path·as·erl·scheme·scripts.·A·matching·URL·is·mapped330 all·URLs·matching·url-path·as·erl·scheme·scripts.·A·matching·URL·is·mapped
331 into·a·specific·module·and·function,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4492119329-1">{</span><span·class="ss">erl_script_alias</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4492119329-2">{</span><span·class="s">&quot;/cgi-bin/example&quot;</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·243,·SHA:·46a43cb73fdfd433dc52e158804b0b899e605ff08e9f627cd84c191de3ce12fc·...·]-1">}</span></code></pre><p>A·request·to·<a·href="http://your.server.org/cgi-bin/example/httpd_example:yahoo">http://your.server.org/cgi-bin/example/httpd_example:yahoo</a>·would331 into·a·specific·module·and·function,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1490953156-1">{</span><span·class="ss">erl_script_alias</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1490953156-2">{</span><span·class="s">&quot;/cgi-bin/example&quot;</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·243,·SHA:·d275fbce6344e5d6e3dd20345a7d36360363909285a4fb8fa6618c7ac084b829·...·]-1">}</span></code></pre><p>A·request·to·<a·href="http://your.server.org/cgi-bin/example/httpd_example:yahoo">http://your.server.org/cgi-bin/example/httpd_example:yahoo</a>·would
332 refer·to·httpd_example:yahoo/3·or,·if·that·does·not·exist,332 refer·to·httpd_example:yahoo/3·or,·if·that·does·not·exist,
333 httpd_example:yahoo/2·and·<a·href="http://your.server.org/cgi-bin/example/other:yahoo">http://your.server.org/cgi-bin/example/other:yahoo</a>333 httpd_example:yahoo/2·and·<a·href="http://your.server.org/cgi-bin/example/other:yahoo">http://your.server.org/cgi-bin/example/other:yahoo</a>
334 would·not·be·allowed·to·execute.</p></li><li><p><a·href=""·id="prop_esi_nocache"></a>·<strong><code·class="inline">{erl_script_nocache,·boolean()}</code></strong><br/>If·<code·class="inline">erl_script_nocache</code>·is·set·to·<code·class="inline">true</code>,·the·server·adds·HTTP·header·fields334 would·not·be·allowed·to·execute.</p></li><li><p><a·href=""·id="prop_esi_nocache"></a>·<strong><code·class="inline">{erl_script_nocache,·boolean()}</code></strong><br/>If·<code·class="inline">erl_script_nocache</code>·is·set·to·<code·class="inline">true</code>,·the·server·adds·HTTP·header·fields
335 preventing·proxies·from·caching·the·page.·This·is·generally·a·good·idea·for335 preventing·proxies·from·caching·the·page.·This·is·generally·a·good·idea·for
336 dynamic·content,·as·the·content·often·varies·between·each·request.·Default·is336 dynamic·content,·as·the·content·often·varies·between·each·request.·Default·is
337 <code·class="inline">false</code>.</p></li><li><p><a·href=""·id="prop_esi_timeout"></a>·<strong><code·class="inline">{erl_script_timeout,·integer()}</code></strong><br/>If·<code·class="inline">erl_script_timeout</code>·sets·the·time·in·seconds·the·server·waits·between·each337 <code·class="inline">false</code>.</p></li><li><p><a·href=""·id="prop_esi_timeout"></a>·<strong><code·class="inline">{erl_script_timeout,·integer()}</code></strong><br/>If·<code·class="inline">erl_script_timeout</code>·sets·the·time·in·seconds·the·server·waits·between·each
338 chunk·of·data·to·be·delivered·through·<a·href="mod_esi.html#deliver/2"><code·class="inline">mod_esi:deliver/2</code></a>.·Default·is·<code·class="inline">15</code>.338 chunk·of·data·to·be·delivered·through·<a·href="mod_esi.html#deliver/2"><code·class="inline">mod_esi:deliver/2</code></a>.·Default·is·<code·class="inline">15</code>.
Offset 374, 15 lines modifiedOffset 374, 15 lines modified
374 is·written·to·each·file·and·max·files·is·used·before·the·first·file·is374 is·written·to·each·file·and·max·files·is·used·before·the·first·file·is
375 truncated·and·reused.</p></li></ul><p><a·href=""·id="props_auth"></a></p><h3·id="module-authentication-properties-requires-mod_auth"·class="section-heading">375 truncated·and·reused.</p></li></ul><p><a·href=""·id="props_auth"></a></p><h3·id="module-authentication-properties-requires-mod_auth"·class="section-heading">
376 ··<a·href="#module-authentication-properties-requires-mod_auth"·class="hover-link">376 ··<a·href="#module-authentication-properties-requires-mod_auth"·class="hover-link">
377 ····<i·class="ri-link-m"·aria-hidden="true"></i>377 ····<i·class="ri-link-m"·aria-hidden="true"></i>
378 ··</a>378 ··</a>
379 ··<span·class="text">Authentication·Properties·-·Requires·mod_auth</span>379 ··<span·class="text">Authentication·Properties·-·Requires·mod_auth</span>
380 </h3>380 </h3>
381 <p><a·href=""·id="prop_dri"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3716233594-1">{</span><span·class="ss">directory</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3716233594-2">{</span><span·class="nf">path</span><span·class="p"·data-group-id="3716233594-3">(</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·1510,·SHA:·8fcdba6a2e061e92ba181dcea820c37b4fed94820bbb8fc55d97fe339ff7c38c·...·]-1">}</span></code></pre><p>The·host·<code·class="inline">123.34.56.11</code>·and·all·machines·on·the·<code·class="inline">150.100.23</code>·subnet·are381 <p><a·href=""·id="prop_dri"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8690487728-1">{</span><span·class="ss">directory</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8690487728-2">{</span><span·class="nf">path</span><span·class="p"·data-group-id="8690487728-3">(</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·1510,·SHA:·dbf0a757656f599672e717fd0934aaf1157ebc2bcc8f9a993d4ac6471d94ffea·...·]-1">}</span></code></pre><p>The·host·<code·class="inline">123.34.56.11</code>·and·all·machines·on·the·<code·class="inline">150.100.23</code>·subnet·are
382 allowed·access.</p></li><li><p><a·href=""·id="prop_deny_from"></a>·<strong><code·class="inline">{deny_from,·all·|·[RegxpHostString]}</code></strong><br/>Defines·a·set·of·hosts·to·be·denied·access·to·a·given·directory,·for·example:</p><pre><code·class="text">{deny_from,·[&quot;123.34.56.11&quot;,·&quot;150.100.23&quot;]}</code></pre><p>The·host·<code·class="inline">123.34.56.11</code>·and·all·machines·on·the·<code·class="inline">150.100.23</code>·subnet·are·not382 allowed·access.</p></li><li><p><a·href=""·id="prop_deny_from"></a>·<strong><code·class="inline">{deny_from,·all·|·[RegxpHostString]}</code></strong><br/>Defines·a·set·of·hosts·to·be·denied·access·to·a·given·directory,·for·example:</p><pre><code·class="text">{deny_from,·[&quot;123.34.56.11&quot;,·&quot;150.100.23&quot;]}</code></pre><p>The·host·<code·class="inline">123.34.56.11</code>·and·all·machines·on·the·<code·class="inline">150.100.23</code>·subnet·are·not
383 allowed·access.</p></li><li><p><a·href=""·id="prop_auth_type"></a>·<strong><code·class="inline">{auth_type,·plain·|·dets·|·mnesia}</code></strong><br/>Sets·the·type·of·authentication·database·that·is·used·for·the·directory.·The383 allowed·access.</p></li><li><p><a·href=""·id="prop_auth_type"></a>·<strong><code·class="inline">{auth_type,·plain·|·dets·|·mnesia}</code></strong><br/>Sets·the·type·of·authentication·database·that·is·used·for·the·directory.·The
384 key·difference·between·the·different·methods·is·that·dynamic·data·can·be·saved384 key·difference·between·the·different·methods·is·that·dynamic·data·can·be·saved
385 when·Mnesia·and·Dets·are·used.</p></li><li><p><a·href=""·id="prop_auth_user_file"></a>·<strong><code·class="inline">{auth_user_file,·path()}</code></strong><br/>Sets·the·name·of·a·file·containing·the·list·of·users·and·passwords·for·user385 when·Mnesia·and·Dets·are·used.</p></li><li><p><a·href=""·id="prop_auth_user_file"></a>·<strong><code·class="inline">{auth_user_file,·path()}</code></strong><br/>Sets·the·name·of·a·file·containing·the·list·of·users·and·passwords·for·user
386 authentication.·The·filename·can·be·either·absolute·or·relative·to·the386 authentication.·The·filename·can·be·either·absolute·or·relative·to·the
387 <code·class="inline">server_root</code>.·If·using·the·plain·storage·method,·this·file·is·a·plain·text387 <code·class="inline">server_root</code>.·If·using·the·plain·storage·method,·this·file·is·a·plain·text
388 file·where·each·line·contains·a·username·followed·by·a·colon,·followed·by·the388 file·where·each·line·contains·a·username·followed·by·a·colon,·followed·by·the
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409 changed·after·the·web·server·is·started.·Otherwise·it·is·written·in·clear·text409 changed·after·the·web·server·is·started.·Otherwise·it·is·written·in·clear·text
410 in·the·configuration·file.</p></li><li><p><a·href=""·id="prop_req_user"></a>·<strong><code·class="inline">{require_user,·[string()]}</code></strong><br/>Defines·users·to·grant·access·to·a·given·directory·using·a·secret·password.</p></li><li><p><a·href=""·id="prop_req_grp"></a>·<strong><code·class="inline">{require_group,·[string()]}</code></strong><br/>Defines·users·to·grant·access·to·a·given·directory·using·a·secret·password.</p></li></ul><p><a·href=""·id="props_sec"></a></p><h3·id="module-security-properties-requires-mod_security"·class="section-heading">410 in·the·configuration·file.</p></li><li><p><a·href=""·id="prop_req_user"></a>·<strong><code·class="inline">{require_user,·[string()]}</code></strong><br/>Defines·users·to·grant·access·to·a·given·directory·using·a·secret·password.</p></li><li><p><a·href=""·id="prop_req_grp"></a>·<strong><code·class="inline">{require_group,·[string()]}</code></strong><br/>Defines·users·to·grant·access·to·a·given·directory·using·a·secret·password.</p></li></ul><p><a·href=""·id="props_sec"></a></p><h3·id="module-security-properties-requires-mod_security"·class="section-heading">
411 ··<a·href="#module-security-properties-requires-mod_security"·class="hover-link">411 ··<a·href="#module-security-properties-requires-mod_security"·class="hover-link">
412 ····<i·class="ri-link-m"·aria-hidden="true"></i>412 ····<i·class="ri-link-m"·aria-hidden="true"></i>
413 ··</a>413 ··</a>
414 ··<span·class="text">Security·Properties·-·Requires·mod_security</span>414 ··<span·class="text">Security·Properties·-·Requires·mod_security</span>
415 </h3>415 </h3>
416 <p><a·href=""·id="prop_sec_dir"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9116559002-1">{</span><span·class="ss">security_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9116559002-2">{</span><span·class="nf">path</span><span·class="p"·data-group-id="9116559002-3">(</span><span·clas[·...·truncated·by·diffoscope;·len:·717,·SHA:·02498ec1ac3e3a0d8083653ef6454ef542c299dea77ef19e6a406a79c50fbe57·...·]-1">}</span></code></pre><p><a·href=""·id="props_sdir"></a></p><p>The·properties·for·the·security·directories·are·as·follows:</p><ul><li><p><a·href=""·id="prop_data_file"></a>·<strong><code·class="inline">{data_file,·path()}</code></strong><br/>Name·of·the·security·data·file.·The·filename·can·either·be·absolute·or416 <p><a·href=""·id="prop_sec_dir"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3869163941-1">{</span><span·class="ss">security_directory</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3869163941-2">{</span><span·class="nf">path</span><span·class="p"·data-group-id="3869163941-3">(</span><span·clas[·...·truncated·by·diffoscope;·len:·717,·SHA:·775e7f6438c7fa357797e28f770ea06086d242967dcea52f9fd9c250e125da68·...·]-1">}</span></code></pre><p><a·href=""·id="props_sdir"></a></p><p>The·properties·for·the·security·directories·are·as·follows:</p><ul><li><p><a·href=""·id="prop_data_file"></a>·<strong><code·class="inline">{data_file,·path()}</code></strong><br/>Name·of·the·security·data·file.·The·filename·can·either·be·absolute·or
417 relative·to·the·<code·class="inline">server_root</code>.·This·file·is·used·to·store·persistent·data·for417 relative·to·the·<code·class="inline">server_root</code>.·This·file·is·used·to·store·persistent·data·for
418 module·<code·class="inline">mod_security</code>.</p></li><li><p><a·href=""·id="prop_max_retries"></a>·<strong><code·class="inline">{max_retries,·integer()}</code></strong><br/>Specifies·the·maximum·number·of·attempts·to·authenticate·a·user·before·the418 module·<code·class="inline">mod_security</code>.</p></li><li><p><a·href=""·id="prop_max_retries"></a>·<strong><code·class="inline">{max_retries,·integer()}</code></strong><br/>Specifies·the·maximum·number·of·attempts·to·authenticate·a·user·before·the
419 user·is·blocked·out.·If·a·user·successfully·authenticates·while·blocked,·the419 user·is·blocked·out.·If·a·user·successfully·authenticates·while·blocked,·the
420 user·receives·a·403·(Forbidden)·response·from·the·server.·If·the·user·makes·a420 user·receives·a·403·(Forbidden)·response·from·the·server.·If·the·user·makes·a
421 failed·attempt·while·blocked,·the·server·returns·401·(Unauthorized),·for421 failed·attempt·while·blocked,·the·server·returns·401·(Unauthorized),·for
422 security·reasons.·Default·is·<code·class="inline">3</code>.·Can·be·set·to·infinity.</p></li><li><p><a·href=""·id="prop_block_time"></a>·<strong><code·class="inline">{block_time,·integer()}</code></strong><br/>Specifies·the·number·of·minutes·a·user·is·blocked.·After·this·time·has·passed,422 security·reasons.·Default·is·<code·class="inline">3</code>.·Can·be·set·to·infinity.</p></li><li><p><a·href=""·id="prop_block_time"></a>·<strong><code·class="inline">{block_time,·integer()}</code></strong><br/>Specifies·the·number·of·minutes·a·user·is·blocked.·After·this·time·has·passed,
423 the·user·automatically·regains·access.·Default·is·<code·class="inline">60</code>.</p></li><li><p><a·href=""·id="prop_fail_exp_time"></a>·<strong><code·class="inline">{fail_expire_time,·integer()}</code></strong><br/>Specifies·the·number·of·minutes·a·failed·user·authentication·is·remembered.·If423 the·user·automatically·regains·access.·Default·is·<code·class="inline">60</code>.</p></li><li><p><a·href=""·id="prop_fail_exp_time"></a>·<strong><code·class="inline">{fail_expire_time,·integer()}</code></strong><br/>Specifies·the·number·of·minutes·a·failed·user·authentication·is·remembered.·If
Offset 426, 30 lines modifiedOffset 426, 30 lines modified
426 remembered.·After·this·time·has·passed,·the·authentication·is·no·longer426 remembered.·After·this·time·has·passed,·the·authentication·is·no·longer
427 reported.·Default·is·<code·class="inline">30</code>.</p></li></ul><h2·id="module-web-server-api-data-types"·class="section-heading">427 reported.·Default·is·<code·class="inline">30</code>.</p></li></ul><h2·id="module-web-server-api-data-types"·class="section-heading">
428 ··<a·href="#module-web-server-api-data-types"·class="hover-link">428 ··<a·href="#module-web-server-api-data-types"·class="hover-link">
429 ····<i·class="ri-link-m"·aria-hidden="true"></i>429 ····<i·class="ri-link-m"·aria-hidden="true"></i>
430 ··</a>430 ··</a>
431 ··<span·class="text">Web·server·API·data·types</span>431 ··<span·class="text">Web·server·API·data·types</span>
432 </h2>432 </h2>
433 <p>The·Erlang·web·server·API·data·types·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ModData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">mod</span><span·class="p"·data-group-id="8522718184-1">{</span><span·class="p"·data-group-id="8522718184-1">}</span><span·class="w">433 <p>The·Erlang·web·server·API·data·types·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ModData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">mod</span><span·class="p"·data-group-id="5421829216-1">{</span><span·class="p"·data-group-id="5421829216-1">}</span><span·class="w">
434 </span><span·class="w">434 </span><span·class="w">
435 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8522718184-2">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8522718184-3">{</span><span·class="w">435 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5421829216-2">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5421829216-3">{</span><span·class="w">
436 ····</span><span·class="ss">data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8522718184-4">[</span><span·class="p"·data-group-id="8522718184-4">]</span><span·class="p">,</span><span·class="w">436 ····</span><span·class="ss">data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5421829216-4">[</span><span·class="p"·data-group-id="5421829216-4">]</span><span·class="p">,</span><span·class="w">
437 ····</span><span·class="ss">socket_type</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">ip_comm</span><span·class="p">,</span><span·class="w">437 ····</span><span·class="ss">socket_type</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">ip_comm</span><span·class="p">,</span><span·class="w">
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137 takeover,·configure·the·services·to·be·started·at·application·startup.·When137 takeover,·configure·the·services·to·be·started·at·application·startup.·When
138 starting·the·<code·class="inline">Inets</code>·application,·the·<code·class="inline">Inets</code>·top·supervisor·starts·a·number·of138 starting·the·<code·class="inline">Inets</code>·application,·the·<code·class="inline">Inets</code>·top·supervisor·starts·a·number·of
139 subsupervisors·and·worker·processes·for·handling·the·provided·services.·When139 subsupervisors·and·worker·processes·for·handling·the·provided·services.·When
140 starting·services·dynamically,·new·children·are·added·to·the·supervision·tree,140 starting·services·dynamically,·new·children·are·added·to·the·supervision·tree,
141 unless·the·service·is·started·with·the·standalone·option.·In·this·case·the141 unless·the·service·is·started·with·the·standalone·option.·In·this·case·the
142 service·is·linked·to·the·calling·process·and·all·OTP·application·features,·such142 service·is·linked·to·the·calling·process·and·all·OTP·application·features,·such
143 as·soft·upgrade,·are·lost.</p><p>Services·to·be·configured·for·startup·at·application·startup·are·to·be·put·into143 as·soft·upgrade,·are·lost.</p><p>Services·to·be·configured·for·startup·at·application·startup·are·to·be·put·into
144 the·Erlang·node·configuration·file·on·the·following·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7429178886-1">[</span><span·class="p"·data-group-id="7429178886-2">{</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7429178886-3">[</span><span·class="p"·data-group-id="7429178886-4">{</spa[·...·truncated·by·diffoscope;·len:·329,·SHA:·072e9e3d0f914a9610d64ebfecacd0f18eeebfae0b92fe6f3d5a1155b08338a5·...·]-1">]</span><span·class="p">.</span></code></pre><p>For·details·of·what·to·put·in·the·list·of·configured·services,·see·the144 the·Erlang·node·configuration·file·on·the·following·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3925068039-1">[</span><span·class="p"·data-group-id="3925068039-2">{</span><span·class="ss">inets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3925068039-3">[</span><span·class="p"·data-group-id="3925068039-4">{</spa[·...·truncated·by·diffoscope;·len:·329,·SHA:·e135c9a05312b3ef2847fea911a59d80dcf21add68fb6e124c7805ab3e13f887·...·]-1">]</span><span·class="p">.</span></code></pre><p>For·details·of·what·to·put·in·the·list·of·configured·services,·see·the
145 documentation·for·the·services·to·be·configured.</p>145 documentation·for·the·services·to·be·configured.</p>
146 </div>146 </div>
  
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130 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>130 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
131 ······</p>131 ······</p>
132 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>132 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
133 ····</footer>133 ····</footer>
134 ··</div>134 ··</div>
135 </main>135 </main>
136 </div>136 </div>
137 <script>137 <script>
138 ··function·mermaidLoaded()·{138 ··function·mermaidLoaded()·{
139 ····mermaid.initialize({139 ····mermaid.initialize({
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144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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493 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>493 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
494 ······</p>494 ······</p>
495 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>495 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
496 ····</footer>496 ····</footer>
497 ··</div>497 ··</div>
498 </main>498 </main>
499 </div>499 </div>
500 <script>500 <script>
501 ··function·mermaidLoaded()·{501 ··function·mermaidLoaded()·{
502 ····mermaid.initialize({502 ····mermaid.initialize({
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140 ····<i·class="ri-link-m"·aria-hidden="true"></i>140 ····<i·class="ri-link-m"·aria-hidden="true"></i>
141 ··</a>141 ··</a>
142 ··<span·class="text">File·Syntax</span>142 ··<span·class="text">File·Syntax</span>
143 </h2>143 </h2>
144 <p>The·application·resource·file·is·to·be·called·<code·class="inline">Application.app</code>,·where144 <p>The·application·resource·file·is·to·be·called·<code·class="inline">Application.app</code>,·where
145 <code·class="inline">Application</code>·is·the·application·name.·The·file·is·to·be·located·in·directory145 <code·class="inline">Application</code>·is·the·application·name.·The·file·is·to·be·located·in·directory
146 <code·class="inline">ebin</code>·for·the·application.</p><p>The·file·must·contain·a·single·Erlang·term,·which·is·called·an·<em>application146 <code·class="inline">ebin</code>·for·the·application.</p><p>The·file·must·contain·a·single·Erlang·term,·which·is·called·an·<em>application
147 specification</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6549868691-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">147 specification</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2018011242-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">
148 ··</span><span·class="p"·data-group-id="6549868691-2">[</span><span·class="p"·data-group-id="6549868691-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">··</span><span·class="n">Description</span><span·class="p"·data-group-id="6549868691-3">}</span><span·class="p">,</span><span·class="w">148 ··</span><span·class="p"·data-group-id="2018011242-2">[</span><span·class="p"·data-group-id="2018011242-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">··</span><span·class="n">Description</span><span·class="p"·data-group-id="2018011242-3">}</span><span·class="p">,</span><span·class="w">
149 ···</span><span·class="p"·data-group-id="6549868691-4">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="w">···········</span><span·class="n">Id</span><span·class="p"·data-group-id="6549868691-4">}</span><span·class="p">,</span><span·class="w">149 ···</span><span·class="p"·data-group-id="2018011242-4">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="w">···········</span><span·class="n">Id</span><span·class="p"·data-group-id="2018011242-4">}</span><span·class="p">,</span><span·class="w">
150 ···</span><span·class="p"·data-group-id="6549868691-5">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">··········</span><span·class="n">Vsn</span><span·class="p"·data-group-id="6549868691-5">}</span><span·class="p">,</span><span·class="w">150 ···</span><span·class="p"·data-group-id="2018011242-5">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">··········</span><span·class="n">Vsn</span><span·class="p"·data-group-id="2018011242-5">}</span><span·class="p">,</span><span·class="w">
151 ···</span><span·class="p"·data-group-id="6549868691-6">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">······</span><span·class="n">Modules</span><span·class="p"·data-group-id="6549868691-6">}</span><span·class="p">,</span><span·class="w">151 ···</span><span·class="p"·data-group-id="2018011242-6">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">······</span><span·class="n">Modules</span><span·class="p"·data-group-id="2018011242-6">}</span><span·class="p">,</span><span·class="w">
152 ···</span><span·class="p"·data-group-id="6549868691-7">{</span><span·class="ss">maxP</span><span·class="p">,</span><span·class="w">·········</span><span·class="n">MaxP</span><span·class="p"·data-group-id="6549868691-7">}</span><span·class="p">,</span><span·class="w">152 ···</span><span·class="p"·data-group-id="2018011242-7">{</span><span·class="ss">maxP</span><span·class="p">,</span><span·class="w">·········</span><span·class="n">MaxP</span><span·class="p"·data-group-id="2018011242-7">}</span><span·class="p">,</span><span·class="w">
153 ···</span><span·class="p"·data-group-id="6549868691-8">{</span><span·class="ss">maxT</span><span·class="p">,</span><span·class="w">·········</span><span·class="n">MaxT</span><span·class="p"·data-group-id="6549868691-8">}</span><span·class="p">,</span><span·class="w">153 ···</span><span·class="p"·data-group-id="2018011242-8">{</span><span·class="ss">maxT</span><span·class="p">,</span><span·class="w">·········</span><span·class="n">MaxT</span><span·class="p"·data-group-id="2018011242-8">}</span><span·class="p">,</span><span·class="w">
154 ···</span><span·class="p"·data-group-id="6549868691-9">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">···</span><span·class="n">Names</span><span·class="p"·data-group-id="6549868691-9">}</span><span·class="p">,</span><span·class="w">154 ···</span><span·class="p"·data-group-id="2018011242-9">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">···</span><span·class="n">Names</span><span·class="p"·data-group-id="2018011242-9">}</span><span·class="p">,</span><span·class="w">
155 ···</span><span·class="p"·data-group-id="6549868691-10">{</span><span·class="ss">included_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Apps</span><span·class="p"·data-group-id="6549868691-10">}</span><span·class="p">,</span><span·class="w">155 ···</span><span·class="p"·data-group-id="2018011242-10">{</span><span·class="ss">included_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Apps</span><span·class="p"·data-group-id="2018011242-10">}</span><span·class="p">,</span><span·class="w">
156 ···</span><span·class="p"·data-group-id="6549868691-11">{</span><span·class="ss">optional_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Apps</span><span·class="p"·data-group-id="6549868691-11">}</span><span·class="p">,</span><span·class="w">156 ···</span><span·class="p"·data-group-id="2018011242-11">{</span><span·class="ss">optional_applications</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Apps</span><span·class="p"·data-group-id="2018011242-11">}</span><span·class="p">,</span><span·class="w">
157 ···</span><span·class="p"·data-group-id="6549868691-12">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Apps</span><span·class="p"·data-group-id="6549868691-12">}</span><span·class="p">,</span><span·class="w">157 ···</span><span·class="p"·data-group-id="2018011242-12">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Apps</span><span·class="p"·data-group-id="2018011242-12">}</span><span·class="p">,</span><span·class="w">
158 ···</span><span·class="p"·data-group-id="6549868691-13">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">··········</span><span·class="n">Env</span><span·class="p"·data-group-id="6549868691-13">}</span><span·class="p">,</span><span·class="w">158 ···</span><span·class="p"·data-group-id="2018011242-13">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">··········</span><span·class="n">Env</span><span·class="p"·data-group-id="2018011242-13">}</span><span·class="p">,</span><span·class="w">
159 ···</span><span·class="p"·data-group-id="6549868691-14">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">··········</span><span·class="n">Start</span><span·class="p"·data-group-id="6549868691-14">}</span><span·class="p">,</span><span·class="w">159 ···</span><span·class="p"·data-group-id="2018011242-14">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">··········</span><span·class="n">Start</span><span·class="p"·data-group-id="2018011242-14">}</span><span·class="p">,</span><span·class="w">
160 ···</span><span·class="p"·data-group-id="6549868691-15">{</span><span·class="ss">start_phases</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Phases</span><span·class="p"·data-group-id="6549868691-15">}</span><span·class="p">,</span><span·class="w">160 ···</span><span·class="p"·data-group-id="2018011242-15">{</span><span·class="ss">start_phases</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Phases</span><span·class="p"·data-group-id="2018011242-15">}</span><span·class="p">,</span><span·class="w">
161 ···</span><span·class="p"·data-group-id="6549868691-16">{</span><span·class="ss">runtime_dependencies</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RTDeps</span><span·class="p"·data-group-id="6549868691-16">}</span><span·class="p"·data-group-id="6549868691-2">]</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·427021df0c7c8a73787e0fdc77222b03e05e2a98f8b2624490b94ff650f96ea6·...·]-1">}</span><span·class="p">.</span><span·class="w">161 ···</span><span·class="p"·data-group-id="2018011242-16">{</span><span·class="ss">runtime_dependencies</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RTDeps</span><span·class="p"·data-group-id="2018011242-16">}</span><span·class="p"·data-group-id="2018011242-2">]</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·f614652d8671dd4600cdb7b6e7e1aeec380772a97b65a0d5eff30bb5e29e8ff4·...·]-1">}</span><span·class="p">.</span><span·class="w">
  
162 ·············</span><span·class="n">Value</span><span·class="w">················</span><span·class="n">Default</span><span·class="w">162 ·············</span><span·class="n">Value</span><span·class="w">················</span><span·class="n">Default</span><span·class="w">
163 ·············</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">················</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">163 ·············</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">················</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">
164 </span><span·class="n">Application</span><span·class="w">··</span><span·class="nf">atom</span><span·class="p"·data-group-id="6549868691-17">(</span><span·class="p"·data-group-id="6549868691-17">)</span><span·class="w">···············</span><span·class="o">-</span><span·class="w">164 </span><span·class="n">Application</span><span·class="w">··</span><span·class="nf">atom</span><span·class="p"·data-group-id="2018011242-17">(</span><span·class="p"·data-group-id="2018011242-17">)</span><span·class="w">···············</span><span·class="o">-</span><span·class="w">
165 </span><span·class="n">Description</span><span·class="w">··</span><span·class="nf">string</span><span·class="p"·data-group-id="6549868691-18">(</span><span·class="p"·data-group-id="6549868691-18">)</span><span·class="w">·············</span><span·class="s">&quot;&quot;</span><span·class="w">165 </span><span·class="n">Description</span><span·class="w">··</span><span·class="nf">string</span><span·class="p"·data-group-id="2018011242-18">(</span><span·class="p"·data-group-id="2018011242-18">)</span><span·class="w">·············</span><span·class="s">&quot;&quot;</span><span·class="w">
166 </span><span·class="n">Id</span><span·class="w">···········</span><span·class="nf">string</span><span·class="p"·data-group-id="6549868691-19">(</span><span·class="p"·data-group-id="6549868691-19">)</span><span·class="w">·············</span><span·class="s">&quot;&quot;</span><span·class="w">166 </span><span·class="n">Id</span><span·class="w">···········</span><span·class="nf">string</span><span·class="p"·data-group-id="2018011242-19">(</span><span·class="p"·data-group-id="2018011242-19">)</span><span·class="w">·············</span><span·class="s">&quot;&quot;</span><span·class="w">
167 </span><span·class="n">Vsn</span><span·class="w">··········</span><span·class="nf">string</span><span·class="p"·data-group-id="6549868691-20">(</span><span·class="p"·data-group-id="6549868691-20">)</span><span·class="w">·············</span><span·class="s">&quot;&quot;</span><span·class="w">167 </span><span·class="n">Vsn</span><span·class="w">··········</span><span·class="nf">string</span><span·class="p"·data-group-id="2018011242-20">(</span><span·class="p"·data-group-id="2018011242-20">)</span><span·class="w">·············</span><span·class="s">&quot;&quot;</span><span·class="w">
168 </span><span·class="n">Modules</span><span·class="w">······</span><span·class="p"·data-group-id="6549868691-21">[</span><span·class="n">Module</span><span·class="p"·data-group-id="6549868691-21">]</span><span·class="w">·············</span><span·class="p"·data-group-id="6549868691-22">[</span><span·class="p"·data-group-id="6549868691-22">]</span><span·class="w">168 </span><span·class="n">Modules</span><span·class="w">······</span><span·class="p"·data-group-id="2018011242-21">[</span><span·class="n">Module</span><span·class="p"·data-group-id="2018011242-21">]</span><span·class="w">·············</span><span·class="p"·data-group-id="2018011242-22">[</span><span·class="p"·data-group-id="2018011242-22">]</span><span·class="w">
169 </span><span·class="n">MaxP</span><span·class="w">·········</span><span·class="nf">int</span><span·class="p"·data-group-id="6549868691-23">(</span><span·class="p"·data-group-id="6549868691-23">)</span><span·class="w">················</span><span·class="ss">infinity</span><span·class="w">169 </span><span·class="n">MaxP</span><span·class="w">·········</span><span·class="nf">int</span><span·class="p"·data-group-id="2018011242-23">(</span><span·class="p"·data-group-id="2018011242-23">)</span><span·class="w">················</span><span·class="ss">infinity</span><span·class="w">
170 </span><span·class="n">MaxT</span><span·class="w">·········</span><span·class="nf">int</span><span·class="p"·data-group-id="6549868691-24">(</span><span·class="p"·data-group-id="6549868691-24">)</span><span·class="w">················</span><span·class="ss">infinity</span><span·class="w">170 </span><span·class="n">MaxT</span><span·class="w">·········</span><span·class="nf">int</span><span·class="p"·data-group-id="2018011242-24">(</span><span·class="p"·data-group-id="2018011242-24">)</span><span·class="w">················</span><span·class="ss">infinity</span><span·class="w">
171 </span><span·class="n">Names</span><span·class="w">········</span><span·class="p"·data-group-id="6549868691-25">[</span><span·class="n">Name</span><span·class="p"·data-group-id="6549868691-25">]</span><span·class="w">···············</span><span·class="p"·data-group-id="6549868691-26">[</span><span·class="p"·data-group-id="6549868691-26">]</span><span·class="w">171 </span><span·class="n">Names</span><span·class="w">········</span><span·class="p"·data-group-id="2018011242-25">[</span><span·class="n">Name</span><span·class="p"·data-group-id="2018011242-25">]</span><span·class="w">···············</span><span·class="p"·data-group-id="2018011242-26">[</span><span·class="p"·data-group-id="2018011242-26">]</span><span·class="w">
172 </span><span·class="n">Apps</span><span·class="w">·········</span><span·class="p"·data-group-id="6549868691-27">[</span><span·class="n">App</span><span·class="p"·data-group-id="6549868691-27">]</span><span·class="w">················</span><span·class="p"·data-group-id="6549868691-28">[</span><span·class="p"·data-group-id="6549868691-28">]</span><span·class="w">172 </span><span·class="n">Apps</span><span·class="w">·········</span><span·class="p"·data-group-id="2018011242-27">[</span><span·class="n">App</span><span·class="p"·data-group-id="2018011242-27">]</span><span·class="w">················</span><span·class="p"·data-group-id="2018011242-28">[</span><span·class="p"·data-group-id="2018011242-28">]</span><span·class="w">
173 </span><span·class="n">Env</span><span·class="w">··········</span><span·class="p"·data-group-id="6549868691-29">[</span><span·class="p"·data-group-id="6549868691-30">{</span><span·class="n">Par</span><span·class="p">,</span><span·class="n">Val</span><span·class="p"·data-group-id="6549868691-30">}</span><span·class="p"·data-group-id="6549868691-29">]</[·...·truncated·by·diffoscope;·len:·133,·SHA:·ea762d0134c7931eed6ded16b4151a81ad986883e5d4e7827a91f0dc2b3555c8·...·]-31">]</span><span·class="w">173 </span><span·class="n">Env</span><span·class="w">··········</span><span·class="p"·data-group-id="2018011242-29">[</span><span·class="p"·data-group-id="2018011242-30">{</span><span·class="n">Par</span><span·class="p">,</span><span·class="n">Val</span><span·class="p"·data-group-id="2018011242-30">}</span><span·class="p"·data-group-id="2018011242-29">]</[·...·truncated·by·diffoscope;·len:·133,·SHA:·a1c43555b417ec801b181e547790966e28d64fa67d4bb1677320bef065828bd2·...·]-31">]</span><span·class="w">
174 </span><span·class="n">Start</span><span·class="w">········</span><span·class="p"·data-group-id="6549868691-32">{</span><span·class="n">Module</span><span·class="p">,</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="6549868691-32">}</span><span·class="w">···</span><span·class="p"·data-group-id="6549868691-33">[</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·22b1cb6159f53a87e33d68238056d378c76f9a778210d69074d3b69eb2fd058c·...·]-33">]</span><span·class="w">174 </span><span·class="n">Start</span><span·class="w">········</span><span·class="p"·data-group-id="2018011242-32">{</span><span·class="n">Module</span><span·class="p">,</span><span·class="n">StartArgs</span><span·class="p"·data-group-id="2018011242-32">}</span><span·class="w">···</span><span·class="p"·data-group-id="2018011242-33">[</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·6790c2673ee03b2306d0439b8e884554baf66ffbf7b666b4795db3172cdbade9·...·]-33">]</span><span·class="w">
175 </span><span·class="n">Phases</span><span·class="w">·······</span><span·class="p"·data-group-id="6549868691-34">[</span><span·class="p"·data-group-id="6549868691-35">{</span><span·class="n">Phase</span><span·class="p">,</span><span·class="n">PhaseArgs</span><span·class="p"·data-group-id="6549868691-35">}</span><span·class="p"·data-group-id="6549868691-34">]</span><span·class="w">··</span><span·class="ss">undefined</span><span·class="w">175 </span><span·class="n">Phases</span><span·class="w">·······</span><span·class="p"·data-group-id="2018011242-34">[</span><span·class="p"·data-group-id="2018011242-35">{</span><span·class="n">Phase</span><span·class="p">,</span><span·class="n">PhaseArgs</span><span·class="p"·data-group-id="2018011242-35">}</span><span·class="p"·data-group-id="2018011242-34">]</span><span·class="w">··</span><span·class="ss">undefined</span><span·class="w">
176 </span><span·class="n">RTDeps</span><span·class="w">·······</span><span·class="p"·data-group-id="6549868691-36">[</span><span·class="n">ApplicationVersion</span><span·class="p"·data-group-id="6549868691-36">]</span><span·class="w">·</span><span·class="p"·data-group-id="6549868691-37">[</span><span·class="p"·data-group-id="6549868691-37">]</span><span·class="w">176 </span><span·class="n">RTDeps</span><span·class="w">·······</span><span·class="p"·data-group-id="2018011242-36">[</span><span·class="n">ApplicationVersion</span><span·class="p"·data-group-id="2018011242-36">]</span><span·class="w">·</span><span·class="p"·data-group-id="2018011242-37">[</span><span·class="p"·data-group-id="2018011242-37">]</span><span·class="w">
  
177 </span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">App</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Par</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Phase</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6549868691-38">(</span><span·class="p"·data-group-id="6549868691-38">)</span><span·class="w">177 </span><span·class="n">Module</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">App</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Par</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Phase</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="2018011242-38">(</span><span·class="p"·data-group-id="2018011242-38">)</span><span·class="w">
178 </span><span·class="n">Val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">PhaseArgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="6549868691-39">(</span><span·class="p"·data-group-id="6549868691-39">)</span><span·class="w">178 </span><span·class="n">Val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">StartArgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">PhaseArgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="2018011242-39">(</span><span·class="p"·data-group-id="2018011242-39">)</span><span·class="w">
179 </span><span·class="n">ApplicationVersion</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="6549868691-40">(</span><span·class="p"·data-group-id="6549868691-40">)</span></code></pre><ul><li><strong><code·class="inline">Application</code></strong>·-·Application·name.</li></ul><p>For·the·application·controller,·all·keys·are·optional.·The·respective·default179 </span><span·class="n">ApplicationVersion</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="2018011242-40">(</span><span·class="p"·data-group-id="2018011242-40">)</span></code></pre><ul><li><strong><code·class="inline">Application</code></strong>·-·Application·name.</li></ul><p>For·the·application·controller,·all·keys·are·optional.·The·respective·default
180 values·are·used·for·any·omitted·keys.</p><p>The·functions·in·<code·class="inline">systools</code>·require·more·information.·If·they·are·used,·the180 values·are·used·for·any·omitted·keys.</p><p>The·functions·in·<code·class="inline">systools</code>·require·more·information.·If·they·are·used,·the
181 following·keys·are·mandatory:</p><ul><li><code·class="inline">description</code></li><li><code·class="inline">vsn</code></li><li><code·class="inline">modules</code></li><li><code·class="inline">registered</code></li><li><code·class="inline">applications</code></li></ul><p>The·other·keys·are·ignored·by·<code·class="inline">systools</code>.</p><ul><li><p><strong><code·class="inline">description</code></strong>·-·A·one-line·description·of·the·application.</p></li><li><p><strong><code·class="inline">id</code></strong>·-·Product·identification,·or·similar.</p></li><li><p><strong><code·class="inline">vsn</code></strong>·-·Version·of·the·application.</p></li><li><p><strong><code·class="inline">modules</code></strong>·-·All·modules·introduced·by·this·application.·<code·class="inline">systools</code>·uses181 following·keys·are·mandatory:</p><ul><li><code·class="inline">description</code></li><li><code·class="inline">vsn</code></li><li><code·class="inline">modules</code></li><li><code·class="inline">registered</code></li><li><code·class="inline">applications</code></li></ul><p>The·other·keys·are·ignored·by·<code·class="inline">systools</code>.</p><ul><li><p><strong><code·class="inline">description</code></strong>·-·A·one-line·description·of·the·application.</p></li><li><p><strong><code·class="inline">id</code></strong>·-·Product·identification,·or·similar.</p></li><li><p><strong><code·class="inline">vsn</code></strong>·-·Version·of·the·application.</p></li><li><p><strong><code·class="inline">modules</code></strong>·-·All·modules·introduced·by·this·application.·<code·class="inline">systools</code>·uses
182 this·list·when·generating·start·scripts·and·tar·files.·A·module·can·only·be182 this·list·when·generating·start·scripts·and·tar·files.·A·module·can·only·be
183 defined·in·one·application.</p></li><li><p><strong><code·class="inline">maxP</code></strong>·-·<em>Deprecated·-·is·ignored</em></p><p>Maximum·number·of·processes·allowed·in·the·application.</p></li><li><p><strong><code·class="inline">maxT</code></strong>·-·Maximum·time,·in·milliseconds,·that·the·application·is·allowed·to183 defined·in·one·application.</p></li><li><p><strong><code·class="inline">maxP</code></strong>·-·<em>Deprecated·-·is·ignored</em></p><p>Maximum·number·of·processes·allowed·in·the·application.</p></li><li><p><strong><code·class="inline">maxT</code></strong>·-·Maximum·time,·in·milliseconds,·that·the·application·is·allowed·to
184 run.·After·the·specified·time,·the·application·terminates·automatically.</p></li><li><p><strong><code·class="inline">registered</code></strong>·-·All·names·of·registered·processes·started·in·this184 run.·After·the·specified·time,·the·application·terminates·automatically.</p></li><li><p><strong><code·class="inline">registered</code></strong>·-·All·names·of·registered·processes·started·in·this
185 application.·<code·class="inline">systools</code>·uses·this·list·to·detect·name·clashes·between185 application.·<code·class="inline">systools</code>·uses·this·list·to·detect·name·clashes·between
186 different·applications.</p></li><li><p><strong><code·class="inline">included_applications</code></strong>·-·All·applications·included·by·this·application.186 different·applications.</p></li><li><p><strong><code·class="inline">included_applications</code></strong>·-·All·applications·included·by·this·application.
Offset 207, 15 lines modifiedOffset 207, 15 lines modified
207 be·omitted·for·applications·without·processes,·typically·code·libraries,·for207 be·omitted·for·applications·without·processes,·typically·code·libraries,·for
208 example,·STDLIB.</p></li><li><p><strong><code·class="inline">start_phases</code></strong>·-·A·list·of·start·phases·and·corresponding·start·arguments208 example,·STDLIB.</p></li><li><p><strong><code·class="inline">start_phases</code></strong>·-·A·list·of·start·phases·and·corresponding·start·arguments
209 for·the·application.·If·this·key·is·present,·the·application·master,·in209 for·the·application.·If·this·key·is·present,·the·application·master,·in
210 addition·to·the·usual·call·to·<code·class="inline">Module:start/2</code>,·also·calls210 addition·to·the·usual·call·to·<code·class="inline">Module:start/2</code>,·also·calls
211 <code·class="inline">Module:start_phase(Phase,Type,PhaseArgs)</code>·for·each·start·phase·defined·by·key211 <code·class="inline">Module:start_phase(Phase,Type,PhaseArgs)</code>·for·each·start·phase·defined·by·key
212 <code·class="inline">start_phases</code>.·Only·after·this·extended·start·procedure,212 <code·class="inline">start_phases</code>.·Only·after·this·extended·start·procedure,
213 <code·class="inline">application:start(Application)</code>·returns.</p><p>Start·phases·can·be·used·to·synchronize·startup·of·an·application·and·its213 <code·class="inline">application:start(Application)</code>·returns.</p><p>Start·phases·can·be·used·to·synchronize·startup·of·an·application·and·its
214 included·applications.·In·this·case,·key·<code·class="inline">mod</code>·must·be·specified·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4999246286-1">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4999246286-2">{</span><span·class="ss">application_starter</span><span·class="p">,</span><span·class="p"·data-group-id="49992462[·...·truncated·by·diffoscope;·len:·246,·SHA:·b21d516504255f0339c5b647595344f74e0f12833efd3d75791ddd28d2fb4f70·...·]-1">}</span></code></pre><p>The·application·master·then·calls·<code·class="inline">Module:start/2</code>·for·the·primary214 included·applications.·In·this·case,·key·<code·class="inline">mod</code>·must·be·specified·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3947851472-1">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3947851472-2">{</span><span·class="ss">application_starter</span><span·class="p">,</span><span·class="p"·data-group-id="39478514[·...·truncated·by·diffoscope;·len:·246,·SHA:·3b0d2c4975b2dfc688109fa234fe799fd4a3b46be07b17595985dc7738b56a3d·...·]-1">}</span></code></pre><p>The·application·master·then·calls·<code·class="inline">Module:start/2</code>·for·the·primary
215 application,·followed·by·calls·to·<code·class="inline">Module:start_phase/3</code>·for·each·start·phase215 application,·followed·by·calls·to·<code·class="inline">Module:start_phase/3</code>·for·each·start·phase
216 (as·defined·for·the·primary·application),·both·for·the·primary·application·and216 (as·defined·for·the·primary·application),·both·for·the·primary·application·and
217 for·each·of·its·included·applications,·for·which·the·start·phase·is·defined.</p><p>This·implies·that·for·an·included·application,·the·set·of·start·phases·must·be217 for·each·of·its·included·applications,·for·which·the·start·phase·is·defined.</p><p>This·implies·that·for·an·included·application,·the·set·of·start·phases·must·be
218 a·subset·of·the·set·of·phases·defined·for·the·primary·application.·For·more218 a·subset·of·the·set·of·phases·defined·for·the·primary·application.·For·more
219 information,·see·<a·href="../../../../doc/system/applications.html">OTP·Design·Principles</a>.</p></li><li><p><strong><code·class="inline"·id="runtime_dependencies">runtime_dependencies</code></strong>·-·A·list·of·application219 information,·see·<a·href="../../../../doc/system/applications.html">OTP·Design·Principles</a>.</p></li><li><p><strong><code·class="inline"·id="runtime_dependencies">runtime_dependencies</code></strong>·-·A·list·of·application
220 versions·that·the·application·depends·on.·An·example·of·such·an·application220 versions·that·the·application·depends·on.·An·example·of·such·an·application
221 version·is·<code·class="inline">&quot;kernel-3.0&quot;</code>.·Application·versions·specified·as·runtime221 version·is·<code·class="inline">&quot;kernel-3.0&quot;</code>.·Application·versions·specified·as·runtime
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280 ······<p·class="built-using">280 ······<p·class="built-using">
281 ········Built·using281 ········Built·using
282 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the282 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
283 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>283 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
284 ······</p>284 ······</p>
285 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>285 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
286 ····</footer>286 ····</footer>
287 ··</div>287 ··</div>
288 </main>288 </main>
289 </div>289 </div>
290 <script>290 <script>
291 ··function·mermaidLoaded()·{291 ··function·mermaidLoaded()·{
292 ····mermaid.initialize({292 ····mermaid.initialize({
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1591 distributed.·The·argument·overrides·the·value·for·the·application·in·the·Kernel1591 distributed.·The·argument·overrides·the·value·for·the·application·in·the·Kernel
1592 configuration·parameter·<code·class="inline">distributed</code>.·<code·class="inline">Application</code>·must·be·the·application1592 configuration·parameter·<code·class="inline">distributed</code>.·<code·class="inline">Application</code>·must·be·the·application
1593 name·(same·as·in·the·first·argument).·If·a·node·crashes·and·<code·class="inline">Time</code>·is·specified,1593 name·(same·as·in·the·first·argument).·If·a·node·crashes·and·<code·class="inline">Time</code>·is·specified,
1594 the·application·controller·waits·for·<code·class="inline">Time</code>·milliseconds·before·attempting·to1594 the·application·controller·waits·for·<code·class="inline">Time</code>·milliseconds·before·attempting·to
1595 restart·the·application·on·another·node.·If·<code·class="inline">Time</code>·is·not·specified,·it·defaults1595 restart·the·application·on·another·node.·If·<code·class="inline">Time</code>·is·not·specified,·it·defaults
1596 to·<code·class="inline">0</code>·and·the·application·is·restarted·immediately.</p><p><code·class="inline">Nodes</code>·is·a·list·of·node·names·where·the·application·can·run,·in·priority·from1596 to·<code·class="inline">0</code>·and·the·application·is·restarted·immediately.</p><p><code·class="inline">Nodes</code>·is·a·list·of·node·names·where·the·application·can·run,·in·priority·from
1597 left·to·right.·Node·names·can·be·grouped·using·tuples·to·indicate·that·they·have1597 left·to·right.·Node·names·can·be·grouped·using·tuples·to·indicate·that·they·have
1598 the·same·priority.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Nodes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9836243418-1">[</span><span·class="ss">cp1@cave</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9836243418-2">{</span><span·class="ss">cp2@cave</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cp3@c[·...·truncated·by·diffoscope;·len:·104,·SHA:·cdb517efbc3c96e52a93ff3b9a7e46245762156ddd1010a2d3f100e0a17c7064·...·]-1">]</span></code></pre><p>This·means·that·the·application·is·preferably·to·be·started·at·<code·class="inline">cp1@cave</code>.·If1598 the·same·priority.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Nodes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9311530246-1">[</span><span·class="ss">cp1@cave</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9311530246-2">{</span><span·class="ss">cp2@cave</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cp3@c[·...·truncated·by·diffoscope;·len:·104,·SHA:·811966f9b9448c9f911028470f08bf93a7d8899a81752011484284a70bf07ecd·...·]-1">]</span></code></pre><p>This·means·that·the·application·is·preferably·to·be·started·at·<code·class="inline">cp1@cave</code>.·If
1599 <code·class="inline">cp1@cave</code>·is·down,·the·application·is·to·be·started·at·<code·class="inline">cp2@cave</code>·or1599 <code·class="inline">cp1@cave</code>·is·down,·the·application·is·to·be·started·at·<code·class="inline">cp2@cave</code>·or
1600 <code·class="inline">cp3@cave</code>.</p><p>If·<code·class="inline">Distributed·==·default</code>,·the·value·for·the·application·in·the·Kernel1600 <code·class="inline">cp3@cave</code>.</p><p>If·<code·class="inline">Distributed·==·default</code>,·the·value·for·the·application·in·the·Kernel
1601 configuration·parameter·<code·class="inline">distributed</code>·is·used.</p>1601 configuration·parameter·<code·class="inline">distributed</code>·is·used.</p>
1602 ··</section>1602 ··</section>
1603 </section>1603 </section>
1604 <section·class="detail"·id="loaded_applications/0">1604 <section·class="detail"·id="loaded_applications/0">
  
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2177 ······<p·class="built-using">2177 ······<p·class="built-using">
2178 ········Built·using2178 ········Built·using
2179 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2179 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2180 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2180 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2181 ······</p>2181 ······</p>
2182 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2182 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2183 ····</footer>2183 ····</footer>
2184 ··</div>2184 ··</div>
2185 </main>2185 </main>
2186 </div>2186 </div>
2187 <script>2187 <script>
2188 ··function·mermaidLoaded()·{2188 ··function·mermaidLoaded()·{
2189 ····mermaid.initialize({2189 ····mermaid.initialize({
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457 ······<p·class="built-using">457 ······<p·class="built-using">
458 ········Built·using458 ········Built·using
459 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the459 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
460 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>460 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
461 ······</p>461 ······</p>
462 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>462 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
463 ····</footer>463 ····</footer>
464 ··</div>464 ··</div>
465 </main>465 </main>
466 </div>466 </div>
467 <script>467 <script>
468 ··function·mermaidLoaded()·{468 ··function·mermaidLoaded()·{
469 ····mermaid.initialize({469 ····mermaid.initialize({
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Offset 189, 19 lines modifiedOffset 189, 19 lines modified
189 <a·href="#lib_dir/2"><code·class="inline">code:lib_dir/2</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erl_prim_loader.html"><code·class="inline">erl_prim_loader</code></a>.</p></section><p>The·Erlang·archives·are·<code·class="inline">ZIP</code>·files·with·extension·<code·class="inline">.ez</code>.·Erlang·archives·can189 <a·href="#lib_dir/2"><code·class="inline">code:lib_dir/2</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erl_prim_loader.html"><code·class="inline">erl_prim_loader</code></a>.</p></section><p>The·Erlang·archives·are·<code·class="inline">ZIP</code>·files·with·extension·<code·class="inline">.ez</code>.·Erlang·archives·can
190 also·be·<a·href="../../../../lib/stdlib-6.2.2/doc/html/escript.html">enclosed·in·<code·class="inline">escript</code></a>·files·whose·file·extension·is·arbitrary.</p><p>Erlang·archive·files·can·contain·entire·Erlang·applications·or·parts·of190 also·be·<a·href="../../../../lib/stdlib-6.2.2/doc/html/escript.html">enclosed·in·<code·class="inline">escript</code></a>·files·whose·file·extension·is·arbitrary.</p><p>Erlang·archive·files·can·contain·entire·Erlang·applications·or·parts·of
191 applications.·The·structure·in·an·archive·file·is·the·same·as·the·directory191 applications.·The·structure·in·an·archive·file·is·the·same·as·the·directory
192 structure·for·an·application.·If·you,·for·example,·create·an·archive·of192 structure·for·an·application.·If·you,·for·example,·create·an·archive·of
193 <code·class="inline">mnesia-4.4.7</code>,·the·archive·file·must·be·named·<code·class="inline">mnesia-4.4.7.ez</code>·and·it·must193 <code·class="inline">mnesia-4.4.7</code>,·the·archive·file·must·be·named·<code·class="inline">mnesia-4.4.7.ez</code>·and·it·must
194 contain·a·top·directory·named·<code·class="inline">mnesia-4.4.7</code>.·If·the·version·part·of·the·name·is194 contain·a·top·directory·named·<code·class="inline">mnesia-4.4.7</code>.·If·the·version·part·of·the·name·is
195 omitted,·it·must·also·be·omitted·in·the·archive.·That·is,·a·<code·class="inline">mnesia.ez</code>·archive195 omitted,·it·must·also·be·omitted·in·the·archive.·That·is,·a·<code·class="inline">mnesia.ez</code>·archive
196 must·contain·a·<code·class="inline">mnesia</code>·top·directory.</p><p>An·archive·file·for·an·application·can,·for·example,·be·created·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">zip</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="9825727324-1">(</span><span·class="s">&quot;mnesia-4.4.7.ez&quot;</span><span·class="p">,</span><span·class="w">196 must·contain·a·<code·class="inline">mnesia</code>·top·directory.</p><p>An·archive·file·for·an·application·can,·for·example,·be·created·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">zip</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="8137246279-1">(</span><span·class="s">&quot;mnesia-4.4.7.ez&quot;</span><span·class="p">,</span><span·class="w">
197 »       </span><span·class="p"·data-group-id="9825727324-2">[</span><span·class="s">&quot;mnesia-4.4.7&quot;</span><span·class="p"·data-group-id="9825727324-2">]</span><span·class="p">,</span><span·class="w">197 »       </span><span·class="p"·data-group-id="8137246279-2">[</span><span·class="s">&quot;mnesia-4.4.7&quot;</span><span·class="p"·data-group-id="8137246279-2">]</span><span·class="p">,</span><span·class="w">
198 »       </span><span·class="p"·data-group-id="9825727324-3">[</span><span·class="p"·data-group-id="9825727324-4">{</span><span·class="ss">cwd</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·124,·SHA:·856ac33efcca21d13ab784718971b29eeb97ef90a2844f1b4014483345a6cbd4·...·]-4">}</span><span·class="p">,</span><span·class="w">198 »       </span><span·class="p"·data-group-id="8137246279-3">[</span><span·class="p"·data-group-id="8137246279-4">{</span><span·class="ss">cwd</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·124,·SHA:·e35c1ce6039bfdf19fc5869bead5681595e53ae400af8578608673f1ec00965e·...·]-4">}</span><span·class="p">,</span><span·class="w">
199 »       ·</span><span·class="p"·data-group-id="9825727324-6">{</span><span·class="ss">compress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all</span><span·class="p"·data-group-id="9825727324-6">}</span><span·class="p">,</span><span·class="w">199 »       ·</span><span·class="p"·data-group-id="8137246279-6">{</span><span·class="ss">compress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all</span><span·class="p"·data-group-id="8137246279-6">}</span><span·class="p">,</span><span·class="w">
200 »       ·</span><span·class="p"·data-group-id="9825727324-7">{</span><span·class="ss">uncompress</span><span·class="p">,</span><span·class="p"·data-group-id="9825727324-8">[</span><span·class="s">&quot;.beam&quot;</span><span·class="p">,</span><span·class="s">&quot;.app&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·180,·SHA:·e55cabcde8c7142e73369069eaa288607718da8ddfb2c5cc05defb9594822137·...·]-1">)</span><span·class="p">.</span></code></pre><p>Any·file·in·the·archive·can·be·compressed,·but·to·speed·up·the·access·of200 »       ·</span><span·class="p"·data-group-id="8137246279-7">{</span><span·class="ss">uncompress</span><span·class="p">,</span><span·class="p"·data-group-id="8137246279-8">[</span><span·class="s">&quot;.beam&quot;</span><span·class="p">,</span><span·class="s">&quot;.app&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·180,·SHA:·fd0a7c9b9377f5f4a4143d17fcf41beb920dced30d29fcf13a89ed9aeee7a68f·...·]-1">)</span><span·class="p">.</span></code></pre><p>Any·file·in·the·archive·can·be·compressed,·but·to·speed·up·the·access·of
201 frequently·read·files,·it·can·be·a·good·idea·to·store·<code·class="inline">beam</code>·and·<code·class="inline">app</code>·files201 frequently·read·files,·it·can·be·a·good·idea·to·store·<code·class="inline">beam</code>·and·<code·class="inline">app</code>·files
202 uncompressed·in·the·archive.</p><p>Normally·the·top·directory·of·an·application·is·located·in·library·directory202 uncompressed·in·the·archive.</p><p>Normally·the·top·directory·of·an·application·is·located·in·library·directory
203 <code·class="inline">$OTPROOT/lib</code>·or·in·a·directory·referred·to·by·environment·variable·<code·class="inline">ERL_LIBS</code>.203 <code·class="inline">$OTPROOT/lib</code>·or·in·a·directory·referred·to·by·environment·variable·<code·class="inline">ERL_LIBS</code>.
204 At·startup,·when·the·initial·code·path·is·computed,·the·code·server·also·looks204 At·startup,·when·the·initial·code·path·is·computed,·the·code·server·also·looks
205 for·archive·files·in·these·directories·and·possibly·adds·<code·class="inline">ebin</code>·directories·in205 for·archive·files·in·these·directories·and·possibly·adds·<code·class="inline">ebin</code>·directories·in
206 archives·to·the·code·path.·The·code·path·then·contains·paths·to·directories·that206 archives·to·the·code·path.·The·code·path·then·contains·paths·to·directories·that
207 look·like·<code·class="inline">$OTPROOT/lib/mnesia.ez/mnesia/ebin</code>·or207 look·like·<code·class="inline">$OTPROOT/lib/mnesia.ez/mnesia/ebin</code>·or
Offset 1819, 18 lines modifiedOffset 1819, 18 lines modified
1819 none·of·the·modules·are·loaded·if·there·is·a·problem·with·any·of·the1819 none·of·the·modules·are·loaded·if·there·is·a·problem·with·any·of·the
1820 modules.</p><p>Loading·can·fail·for·one·the·following·reasons:</p><ul><li><p><strong><code·class="inline">badfile</code></strong>·-·The·object·code·has·an·incorrect·format·or·the·module·name·in1820 modules.</p><p>Loading·can·fail·for·one·the·following·reasons:</p><ul><li><p><strong><code·class="inline">badfile</code></strong>·-·The·object·code·has·an·incorrect·format·or·the·module·name·in
1821 the·object·code·is·not·the·expected·module·name.</p></li><li><p><strong><code·class="inline">nofile</code></strong>·-·No·file·with·object·code·exists.</p></li><li><p><strong><code·class="inline">on_load_not_allowed</code></strong>·-·A·module·contains·an1821 the·object·code·is·not·the·expected·module·name.</p></li><li><p><strong><code·class="inline">nofile</code></strong>·-·No·file·with·object·code·exists.</p></li><li><p><strong><code·class="inline">on_load_not_allowed</code></strong>·-·A·module·contains·an
1822 <a·href="../../../../doc/system/code_loading.html#on_load">-on_load·function</a>.</p></li><li><p><strong><code·class="inline">duplicated</code></strong>·-·A·module·is·included·more·than·once·in·<code·class="inline">Modules</code>.</p></li><li><p><strong><code·class="inline">not_purged</code></strong>·-·The·object·code·cannot·be·loaded·because·an·old·version·of1822 <a·href="../../../../doc/system/code_loading.html#on_load">-on_load·function</a>.</p></li><li><p><strong><code·class="inline">duplicated</code></strong>·-·A·module·is·included·more·than·once·in·<code·class="inline">Modules</code>.</p></li><li><p><strong><code·class="inline">not_purged</code></strong>·-·The·object·code·cannot·be·loaded·because·an·old·version·of
1823 the·code·already·exists.</p></li><li><p><strong><code·class="inline">sticky_directory</code></strong>·-·The·object·code·resides·in·a·sticky·directory.</p></li><li><p><strong><code·class="inline">pending_on_load</code></strong>·-·A·previously·loaded·module·contains·an·<code·class="inline">-on_load</code>1823 the·code·already·exists.</p></li><li><p><strong><code·class="inline">sticky_directory</code></strong>·-·The·object·code·resides·in·a·sticky·directory.</p></li><li><p><strong><code·class="inline">pending_on_load</code></strong>·-·A·previously·loaded·module·contains·an·<code·class="inline">-on_load</code>
1824 function·that·never·finished.</p></li></ul><p>If·it·is·important·to·minimize·the·time·that·an·application·is·inactive·while1824 function·that·never·finished.</p></li></ul><p>If·it·is·important·to·minimize·the·time·that·an·application·is·inactive·while
1825 changing·code,·use·<a·href="#prepare_loading/1"><code·class="inline">prepare_loading/1</code></a>·and·<a·href="#finish_loading/1"><code·class="inline">finish_loading/1</code></a>·instead·of1825 changing·code,·use·<a·href="#prepare_loading/1"><code·class="inline">prepare_loading/1</code></a>·and·<a·href="#finish_loading/1"><code·class="inline">finish_loading/1</code></a>·instead·of
1826 <a·href="#atomic_load/1"><code·class="inline">atomic_load/1</code></a>.·Here·is·an·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0454361986-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Prepared</span><span·class="p"·data-group-id="0454361986-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span>[·...·truncated·by·diffoscope;·len:·187,·SHA:·04c5a314861ba5f59fc53d1ad91e8361a861b144606ab220b9b1210a6f9e52f1·...·]-2">)</span><span·class="p">,</span><span·class="w">1826 <a·href="#atomic_load/1"><code·class="inline">atomic_load/1</code></a>.·Here·is·an·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6652721839-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Prepared</span><span·class="p"·data-group-id="6652721839-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span>[·...·truncated·by·diffoscope;·len:·187,·SHA:·b67f957bbd9e799e30c49d091439a1f3933d6219f1286f318a4bb27339b0efd8·...·]-2">)</span><span·class="p">,</span><span·class="w">
1827 </span><span·class="c1">%%·Put·the·application·into·an·inactive·state·or·do·any</span><span·class="w">1827 </span><span·class="c1">%%·Put·the·application·into·an·inactive·state·or·do·any</span><span·class="w">
1828 </span><span·class="c1">%%·other·preparation·needed·before·changing·the·code.</span><span·class="w">1828 </span><span·class="c1">%%·other·preparation·needed·before·changing·the·code.</span><span·class="w">
1829 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">finish_loading</span><span·class="p"·data-group-id="0454361986-3">(</span><span·class="n">Prepared</span><span·class="p"·data-group-id="0454361986-3">)</span><span·class="p">,</span><span·class="w">1829 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">finish_loading</span><span·class="p"·data-group-id="6652721839-3">(</span><span·class="n">Prepared</span><span·class="p"·data-group-id="6652721839-3">)</span><span·class="p">,</span><span·class="w">
1830 </span><span·class="c1">%%·Resume·the·application.</span></code></pre>1830 </span><span·class="c1">%%·Resume·the·application.</span></code></pre>
1831 ··</section>1831 ··</section>
1832 </section>1832 </section>
1833 <section·class="detail"·id="clash/0">1833 <section·class="detail"·id="clash/0">
  
1834 ··<div·class="detail-header">1834 ··<div·class="detail-header">
1835 ····<a·href="#clash/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1835 ····<a·href="#clash/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2343, 16 lines modifiedOffset 2343, 16 lines modified
2343 ······</div>2343 ······</div>
  
2344 <p>Returns·the·object·code·for·module·<code·class="inline">Module</code>·if·found·in·the·code·path.</p><p>Returns·<code·class="inline">{Module,·Binary,·Filename}</code>·if·successful,·otherwise2344 <p>Returns·the·object·code·for·module·<code·class="inline">Module</code>·if·found·in·the·code·path.</p><p>Returns·<code·class="inline">{Module,·Binary,·Filename}</code>·if·successful,·otherwise
2345 <code·class="inline">error</code>.·<code·class="inline">Binary</code>·is·a·binary·data·object,·which·contains·the·object2345 <code·class="inline">error</code>.·<code·class="inline">Binary</code>·is·a·binary·data·object,·which·contains·the·object
2346 code·for·the·module.·This·is·useful·if·code·is·to·be·loaded·on·a2346 code·for·the·module.·This·is·useful·if·code·is·to·be·loaded·on·a
2347 remote·node·in·a·distributed·system.·For·example,·loading·module2347 remote·node·in·a·distributed·system.·For·example,·loading·module
2348 <code·class="inline">Module</code>·on·a·node·<code·class="inline">Node</code>·is·done·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">2348 <code·class="inline">Module</code>·on·a·node·<code·class="inline">Node</code>·is·done·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
2349 </span><span·class="p"·data-group-id="1267958662-1">{</span><span·class="p">_</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Binary</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filename</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·314,·SHA:·878e3f3668005f3fcebfe853309c46e296768911525482f5c5a0e662060a092a·...·]-2">)</span><span·class="p">,</span><span·class="w">2349 </span><span·class="p"·data-group-id="7524244127-1">{</span><span·class="p">_</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Binary</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filename</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·314,·SHA:·afca5c8d8af1d97acaaedc395a1510de4ba3b33447dcd48a04747cc5c60231b3·...·]-2">)</span><span·class="p">,</span><span·class="w">
2350 </span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="1267958662-3">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">load_binary</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·332,·SHA:·64c8cd9a7626e27f9c4edef5306d4d3578e8d91313ef4c447725dc3f41064363·...·]-3">)</span><span·class="p">,</span><span·class="w">2350 </span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="7524244127-3">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">load_binary</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·332,·SHA:·5c0a0b46a2d4c94396dc723669e085a9e0b3bd659da389d78f9e526e976bb5b0·...·]-3">)</span><span·class="p">,</span><span·class="w">
2351 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>2351 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>
2352 ··</section>2352 ··</section>
2353 </section>2353 </section>
2354 <section·class="detail"·id="get_path/0">2354 <section·class="detail"·id="get_path/0">
  
2355 ··<div·class="detail-header">2355 ··<div·class="detail-header">
2356 ····<a·href="#get_path/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2356 ····<a·href="#get_path/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2455, 15 lines modifiedOffset 2455, 15 lines modified
2455 ······<div·class="specs">2455 ······<div·class="specs">
  
2456 ··········<pre·translate="no"><span·class="attribute">-spec</span>·lib_dir()·->·<a·href="file.html#t:filename/0">file:filename</a>().</pre>2456 ··········<pre·translate="no"><span·class="attribute">-spec</span>·lib_dir()·->·<a·href="file.html#t:filename/0">file:filename</a>().</pre>
  
2457 ······</div>2457 ······</div>
  
2458 <p>Returns·the·library·directory,·<code·class="inline">$OTPROOT/lib</code>,·where·<code·class="inline">$OTPROOT</code>·is·the·root2458 <p>Returns·the·library·directory,·<code·class="inline">$OTPROOT/lib</code>,·where·<code·class="inline">$OTPROOT</code>·is·the·root
2459 directory·of·Erlang/OTP.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="6205086969-1">(</span><span·class="p"·data-group-id="6205086969-1">)</span><span·class="p">.</span><span·class="w">2459 directory·of·Erlang/OTP.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="6171055551-1">(</span><span·class="p"·data-group-id="6171055551-1">)</span><span·class="p">.</span><span·class="w">
2460 </span><span·class="s">&quot;/usr/local/otp/lib&quot;</span></code></pre>2460 </span><span·class="s">&quot;/usr/local/otp/lib&quot;</span></code></pre>
2461 ··</section>2461 ··</section>
2462 </section>2462 </section>
2463 <section·class="detail"·id="lib_dir/1">2463 <section·class="detail"·id="lib_dir/1">
  
2464 ··<div·class="detail-header">2464 ··<div·class="detail-header">
2465 ····<a·href="#lib_dir/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2465 ····<a·href="#lib_dir/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2492, 15 lines modifiedOffset 2492, 15 lines modified
2492 an·<code·class="inline">ebin</code>·subdirectory,·the·path·to·this·directory·is·returned·(not·the·<code·class="inline">ebin</code>2492 an·<code·class="inline">ebin</code>·subdirectory,·the·path·to·this·directory·is·returned·(not·the·<code·class="inline">ebin</code>
2493 directory).</p><p>If·the·directory·refers·to·a·directory·in·an·archive,·the·archive·name·is2493 directory).</p><p>If·the·directory·refers·to·a·directory·in·an·archive,·the·archive·name·is
2494 stripped·away·before·the·path·is·returned.·For·example,·if·directory2494 stripped·away·before·the·path·is·returned.·For·example,·if·directory
2495 <code·class="inline">/usr/local/otp/lib/mnesia-4.2.2.ez/mnesia-4.2.2/ebin</code>·is·in·the·path,2495 <code·class="inline">/usr/local/otp/lib/mnesia-4.2.2.ez/mnesia-4.2.2/ebin</code>·is·in·the·path,
2496 <code·class="inline">/usr/local/otp/lib/mnesia-4.2.2/ebin</code>·is·returned.·This·means·that·the·library2496 <code·class="inline">/usr/local/otp/lib/mnesia-4.2.2/ebin</code>·is·returned.·This·means·that·the·library
2497 directory·for·an·application·is·the·same,·regardless·if·the·application·resides2497 directory·for·an·application·is·the·same,·regardless·if·the·application·resides
2498 in·an·archive·or·not.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Warning</h4><p>Archives·are·experimental.·In·a·future·release,·they·can·be·removed·or2498 in·an·archive·or·not.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Warning</h4><p>Archives·are·experimental.·In·a·future·release,·they·can·be·removed·or
2499 their·behavior·can·change.</p></section><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="8212994192-1">(</span><span·class="ss">mnesia</span><span·class="p"·data-group-id="8212994192-1">)</span><span·class="p">.</span><span·class="w">2499 their·behavior·can·change.</p></section><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="5159836822-1">(</span><span·class="ss">mnesia</span><span·class="p"·data-group-id="5159836822-1">)</span><span·class="p">.</span><span·class="w">
2500 </span><span·class="s">&quot;/usr/local/otp/lib/mnesia-4.23&quot;</span></code></pre><p>Returns·<code·class="inline">{error,·bad_name}</code>·if·<code·class="inline">Name</code>·is·not·the·name·of·an·application·under2500 </span><span·class="s">&quot;/usr/local/otp/lib/mnesia-4.23&quot;</span></code></pre><p>Returns·<code·class="inline">{error,·bad_name}</code>·if·<code·class="inline">Name</code>·is·not·the·name·of·an·application·under
2501 <code·class="inline">$OTPROOT/lib</code>·or·on·a·directory·referred·to·through·environment·variable2501 <code·class="inline">$OTPROOT/lib</code>·or·on·a·directory·referred·to·through·environment·variable
2502 <code·class="inline">ERL_LIBS</code>.·Fails·with·an·exception·if·<code·class="inline">Name</code>·has·the·wrong·type.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>For·backward·compatibility,·<code·class="inline">Name</code>·is·also·allowed·to·be·a·string.·That·will2502 <code·class="inline">ERL_LIBS</code>.·Fails·with·an·exception·if·<code·class="inline">Name</code>·has·the·wrong·type.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>For·backward·compatibility,·<code·class="inline">Name</code>·is·also·allowed·to·be·a·string.·That·will
2503 probably·change·in·a·future·release.</p></section>2503 probably·change·in·a·future·release.</p></section>
2504 ··</section>2504 ··</section>
2505 </section>2505 </section>
2506 <section·class="detail"·id="lib_dir/2">2506 <section·class="detail"·id="lib_dir/2">
Offset 2533, 15 lines modifiedOffset 2533, 15 lines modified
2533 <p>Returns·the·path·to·a·subdirectory·directly·under·the·top·directory·of·an2533 <p>Returns·the·path·to·a·subdirectory·directly·under·the·top·directory·of·an
2534 application.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>This·function·is·part·of·the·archive·support,·which·is·an·experimental2534 application.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><p>This·function·is·part·of·the·archive·support,·which·is·an·experimental
2535 feature·that·will·be·changed·or·removed·in·a·future·release.</p></section><p>Normally·the·subdirectories·reside·under·the·top·directory·for·the2535 feature·that·will·be·changed·or·removed·in·a·future·release.</p></section><p>Normally·the·subdirectories·reside·under·the·top·directory·for·the
2536 application,·but·when·applications·at·least·partly·reside·in·an·archive,·the2536 application,·but·when·applications·at·least·partly·reside·in·an·archive,·the
2537 situation·is·different.·Some·of·the·subdirectories·can·reside·as·regular2537 situation·is·different.·Some·of·the·subdirectories·can·reside·as·regular
2538 directories·while·others·reside·in·an·archive·file.·It·is·not·checked·whether2538 directories·while·others·reside·in·an·archive·file.·It·is·not·checked·whether
2539 this·directory·exists.</p><p>Instead·of·using·this·function,·use·<a·href="#lib_dir/1"><code·class="inline">code:lib_dir/1</code></a>2539 this·directory·exists.</p><p>Instead·of·using·this·function,·use·<a·href="#lib_dir/1"><code·class="inline">code:lib_dir/1</code></a>
2540 and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/filename.html#join/2"><code·class="inline">filename:join/2</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="5101625451-1">(</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="5101625451-2">(</span><span·class="ss">megaco</span><span·class="p"·data-group-id="5101625451-2">)</span><span·class="p"[·...·truncated·by·diffoscope;·len:·113,·SHA:·5699e6d7484e406bee90f270cd0e904f3616ba37103692584357a067504530b0·...·]-1">)</span><span·class="p">.</span><span·class="w">2540 and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/filename.html#join/2"><code·class="inline">filename:join/2</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="2978071273-1">(</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="2978071273-2">(</span><span·class="ss">megaco</span><span·class="p"·data-group-id="2978071273-2">)</span><span·class="p"[·...·truncated·by·diffoscope;·len:·113,·SHA:·23563b0a0b572d1cfe9fdcdde050e8498fcd73e759bd335dce928cc62f977074·...·]-1">)</span><span·class="p">.</span><span·class="w">
2541 </span><span·class="s">&quot;/usr/local/otp/lib/megaco-3.9.1.1/priv&quot;</span></code></pre><p>Fails·with·an·exception·if·<code·class="inline">Name</code>·or·<code·class="inline">SubDir</code>·has·the·wrong·type.</p>2541 </span><span·class="s">&quot;/usr/local/otp/lib/megaco-3.9.1.1/priv&quot;</span></code></pre><p>Fails·with·an·exception·if·<code·class="inline">Name</code>·or·<code·class="inline">SubDir</code>·has·the·wrong·type.</p>
2542 ··</section>2542 ··</section>
2543 </section>2543 </section>
2544 <section·class="detail"·id="load_abs/1">2544 <section·class="detail"·id="load_abs/1">
  
2545 ··<div·class="detail-header">2545 ··<div·class="detail-header">
2546 ····<a·href="#load_abs/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2546 ····<a·href="#load_abs/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2964, 15 lines modifiedOffset 2964, 15 lines modified
2964 ······<div·class="specs">2964 ······<div·class="specs">
  
2965 ··········<pre·translate="no"><span·class="attribute">-spec</span>·root_dir()·->·<a·href="file.html#t:filename/0">file:filename</a>().</pre>2965 ··········<pre·translate="no"><span·class="attribute">-spec</span>·root_dir()·->·<a·href="file.html#t:filename/0">file:filename</a>().</pre>
  
2966 ······</div>2966 ······</div>
  
2967 <p>Returns·the·root·directory·of·Erlang/OTP,·which·is·the·directory·where·it·is2967 <p>Returns·the·root·directory·of·Erlang/OTP,·which·is·the·directory·where·it·is
2968 installed.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">root_dir</span><span·class="p"·data-group-id="4129044825-1">(</span><span·class="p"·data-group-id="4129044825-1">)</span><span·class="p">.</span><span·class="w">2968 installed.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">root_dir</span><span·class="p"·data-group-id="4185534898-1">(</span><span·class="p"·data-group-id="4185534898-1">)</span><span·class="p">.</span><span·class="w">
2969 </span><span·class="s">&quot;/usr/local/otp&quot;</span></code></pre>2969 </span><span·class="s">&quot;/usr/local/otp&quot;</span></code></pre>
2970 ··</section>2970 ··</section>
2971 </section>2971 </section>
2972 <section·class="detail"·id="set_coverage_mode/1">2972 <section·class="detail"·id="set_coverage_mode/1">
  
2973 ··<div·class="detail-header">2973 ··<div·class="detail-header">
2974 ····<a·href="#set_coverage_mode/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2974 ····<a·href="#set_coverage_mode/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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3240 ······<p·class="built-using">3240 ······<p·class="built-using">
3241 ········Built·using3241 ········Built·using
3242 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3242 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3243 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3243 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3244 ······</p>3244 ······</p>
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148 (see·<a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html"><code·class="inline">erts:erl(1)</code></a>).</p><p>The·value·of·a·configuration·parameter·is·retrieved·by·calling148 (see·<a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html"><code·class="inline">erts:erl(1)</code></a>).</p><p>The·value·of·a·configuration·parameter·is·retrieved·by·calling
149 <code·class="inline">application:get_env/1,2</code>.</p><h2·id="file-syntax"·class="section-heading">149 <code·class="inline">application:get_env/1,2</code>.</p><h2·id="file-syntax"·class="section-heading">
150 ··<a·href="#file-syntax"·class="hover-link">150 ··<a·href="#file-syntax"·class="hover-link">
151 ····<i·class="ri-link-m"·aria-hidden="true"></i>151 ····<i·class="ri-link-m"·aria-hidden="true"></i>
152 ··</a>152 ··</a>
153 ··<span·class="text">File·Syntax</span>153 ··<span·class="text">File·Syntax</span>
154 </h2>154 </h2>
155 <p>The·configuration·file·is·to·be·called·<code·class="inline">Name.config</code>,·where·<code·class="inline">Name</code>·is·any·name.</p><p>File·<code·class="inline">.config</code>·contains·a·single·Erlang·term·and·has·the·following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0346765839-1">[</span><span·class="p"·data-group-id="0346765839-2">{</span><span·class="n">Application1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0346765839-3">[</span><span·class="p"·data-group-id="0346765839-4">[·...·truncated·by·diffoscope;·len:·379,·SHA:·e297178288783d08526b3f3b98b4dfb8973513f36fdd3c26726d815aaec2d394·...·]-2">}</span><span·class="p">,</span><span·class="w">155 <p>The·configuration·file·is·to·be·called·<code·class="inline">Name.config</code>,·where·<code·class="inline">Name</code>·is·any·name.</p><p>File·<code·class="inline">.config</code>·contains·a·single·Erlang·term·and·has·the·following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8593440497-1">[</span><span·class="p"·data-group-id="8593440497-2">{</span><span·class="n">Application1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8593440497-3">[</span><span·class="p"·data-group-id="8593440497-4">[·...·truncated·by·diffoscope;·len:·379,·SHA:·bab439e5abf66c4460f429395fd240ad5f5aa8a73e4a1a852c80f60fe802da46·...·]-2">}</span><span·class="p">,</span><span·class="w">
156 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">156 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
157 ·</span><span·class="p"·data-group-id="0346765839-5">{</span><span·class="n">ApplicationN</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0346765839-6">[</span><span·class="p"·data-group-id="0346765839-7">{</span><span·class="n">ParN1</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·379,·SHA:·c5aa7450ca84a988edefaa515c6802ab00a12a16c29a22ea78b65f12cf201029·...·]-1">]</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">Application·=·atom()</code></strong>·-·Application·name.</p></li><li><p><strong><code·class="inline">Par·=·atom()</code></strong>·-·Name·of·a·configuration·parameter.</p></li><li><p><strong><code·class="inline">Val·=·term()</code></strong>·-·Value·of·a·configuration·parameter.</p></li></ul><h2·id="sys-config"·class="section-heading">157 ·</span><span·class="p"·data-group-id="8593440497-5">{</span><span·class="n">ApplicationN</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8593440497-6">[</span><span·class="p"·data-group-id="8593440497-7">{</span><span·class="n">ParN1</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·379,·SHA:·301d60bbbeef83d92716dd4ba0952732afe3910770f5918b7286d9593cb29777·...·]-1">]</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">Application·=·atom()</code></strong>·-·Application·name.</p></li><li><p><strong><code·class="inline">Par·=·atom()</code></strong>·-·Name·of·a·configuration·parameter.</p></li><li><p><strong><code·class="inline">Val·=·term()</code></strong>·-·Value·of·a·configuration·parameter.</p></li></ul><h2·id="sys-config"·class="section-heading">
158 ··<a·href="#sys-config"·class="hover-link">158 ··<a·href="#sys-config"·class="hover-link">
159 ····<i·class="ri-link-m"·aria-hidden="true"></i>159 ····<i·class="ri-link-m"·aria-hidden="true"></i>
160 ··</a>160 ··</a>
161 ··<span·class="text">sys.config</span>161 ··<span·class="text">sys.config</span>
162 </h2>162 </h2>
163 <p>When·starting·Erlang·in·embedded·mode,·it·is·assumed·that·exactly·one·system163 <p>When·starting·Erlang·in·embedded·mode,·it·is·assumed·that·exactly·one·system
164 configuration·file·is·used,·named·<code·class="inline">sys.config</code>.·This·file·is·to·be·located·in164 configuration·file·is·used,·named·<code·class="inline">sys.config</code>.·This·file·is·to·be·located·in
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253 ······<p·class="built-using">253 ······<p·class="built-using">
254 ········Built·using254 ········Built·using
255 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the255 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
256 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>256 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
257 ······</p>257 ······</p>
258 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>258 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
259 ····</footer>259 ····</footer>
260 ··</div>260 ··</div>
261 </main>261 </main>
262 </div>262 </div>
263 <script>263 <script>
264 ··function·mermaidLoaded()·{264 ··function·mermaidLoaded()·{
265 ····mermaid.initialize({265 ····mermaid.initialize({
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2951 ········Built·using2951 ········Built·using
2952 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2952 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2953 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2953 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2954 ······</p>2954 ······</p>
2955 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2955 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2956 ····</footer>2956 ····</footer>
2957 ··</div>2957 ··</div>
2958 </main>2958 </main>
2959 </div>2959 </div>
2960 <script>2960 <script>
2961 ··function·mermaidLoaded()·{2961 ··function·mermaidLoaded()·{
2962 ····mermaid.initialize({2962 ····mermaid.initialize({
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150 ····<i·class="ri-link-m"·aria-hidden="true"></i>150 ····<i·class="ri-link-m"·aria-hidden="true"></i>
151 ··</a>151 ··</a>
152 ··<span·class="text">The·&quot;Docs&quot;·format</span>152 ··<span·class="text">The·&quot;Docs&quot;·format</span>
153 </h2>153 </h2>
154 <p>In·both·storages,·the·documentation·is·written·in·the·exactly·same·format:·an154 <p>In·both·storages,·the·documentation·is·written·in·the·exactly·same·format:·an
155 Erlang·term·serialized·to·binary·via155 Erlang·term·serialized·to·binary·via
156 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#term_to_binary/1"><code·class="inline">term_to_binary/1</code></a>.·The·term·can·be·optionally156 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#term_to_binary/1"><code·class="inline">term_to_binary/1</code></a>.·The·term·can·be·optionally
157 compressed·when·serialized.·It·must·follow·the·type·specification·below:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8660389186-1">{</span><span·class="ss">docs_v1</span><span·class="p">,</span><span·class="w">157 compressed·when·serialized.·It·must·follow·the·type·specification·below:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9631761190-1">{</span><span·class="ss">docs_v1</span><span·class="p">,</span><span·class="w">
158 ·</span><span·class="n">Anno</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nc">erl_anno</span><span·class="p">:</span><span·class="nf">anno</span><span·class="p"·data-group-id="8660389186-2">(</span><span·class="p"·data-group-id="8660389186-2">)</span><span·class="p">,</span><span·class="w">158 ·</span><span·class="n">Anno</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nc">erl_anno</span><span·class="p">:</span><span·class="nf">anno</span><span·class="p"·data-group-id="9631761190-2">(</span><span·class="p"·data-group-id="9631761190-2">)</span><span·class="p">,</span><span·class="w">
159 ·</span><span·class="n">BeamLanguage</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="8660389186-3">(</span><span·class="p"·data-group-id="8660389186-3">)</span><span·class="p">,</span><span·class="w">159 ·</span><span·class="n">BeamLanguage</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="9631761190-3">(</span><span·class="p"·data-group-id="9631761190-3">)</span><span·class="p">,</span><span·class="w">
160 ·</span><span·class="n">Format</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="8660389186-4">(</span><span·class="p"·data-group-id="8660389186-4">)</span><span·class="p">,</span><span·class="w">160 ·</span><span·class="n">Format</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="9631761190-4">(</span><span·class="p"·data-group-id="9631761190-4">)</span><span·class="p">,</span><span·class="w">
161 ·</span><span·class="n">ModuleDoc</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8660389186-5">#{</span><span·class="n">DocLanguage</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">DocValue</span><span·class="p"·data-group-id="8660389186-5">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">none</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">hidden</span><span·class="p">,</span><span·class="w">161 ·</span><span·class="n">ModuleDoc</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9631761190-5">#{</span><span·class="n">DocLanguage</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">DocValue</span><span·class="p"·data-group-id="9631761190-5">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">none</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">hidden</span><span·class="p">,</span><span·class="w">
162 ·</span><span·class="n">Metadata</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">map</span><span·class="p"·data-group-id="8660389186-6">(</span><span·class="p"·data-group-id="8660389186-6">)</span><span·class="p">,</span><span·class="w">162 ·</span><span·class="n">Metadata</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">map</span><span·class="p"·data-group-id="9631761190-6">(</span><span·class="p"·data-group-id="9631761190-6">)</span><span·class="p">,</span><span·class="w">
163 ·</span><span·class="n">Docs</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">163 ·</span><span·class="n">Docs</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">
164 ···</span><span·class="p"·data-group-id="8660389186-7">[</span><span·class="p"·data-group-id="8660389186-8">{</span><span·class="p"·data-group-id="8660389186-9">{</span><span·class="n">Kind</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·91,·SHA:·bca45339be18d235bfcde8db99d1633cfd4087e43c3484d09805b89762017161·...·]-9">}</span><span·class="p">,</span><span·class="w">164 ···</span><span·class="p"·data-group-id="9631761190-7">[</span><span·class="p"·data-group-id="9631761190-8">{</span><span·class="p"·data-group-id="9631761190-9">{</span><span·class="n">Kind</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·91,·SHA:·4f34622761b6e7263130d32097ecee606bfb009dddad8e742649a7b038eaa924·...·]-9">}</span><span·class="p">,</span><span·class="w">
165 ·····</span><span·class="n">Anno</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nc">erl_anno</span><span·class="p">:</span><span·class="nf">anno</span><span·class="p"·data-group-id="8660389186-10">(</span><span·class="p"·data-group-id="8660389186-10">)</span><span·class="p">,</span><span·class="w">165 ·····</span><span·class="n">Anno</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nc">erl_anno</span><span·class="p">:</span><span·class="nf">anno</span><span·class="p"·data-group-id="9631761190-10">(</span><span·class="p"·data-group-id="9631761190-10">)</span><span·class="p">,</span><span·class="w">
166 ·····</span><span·class="n">Signature</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8660389186-11">[</span><span·class="nf">binary</span><span·class="p"·data-group-id="8660389186-12">(</span><span·class="p"·data-group-id="8660389186-12">)</span><span·class="p"·data-group-id="8660389186-11">]</span><span·class="p">,</span><span·class="w">166 ·····</span><span·class="n">Signature</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9631761190-11">[</span><span·class="nf">binary</span><span·class="p"·data-group-id="9631761190-12">(</span><span·class="p"·data-group-id="9631761190-12">)</span><span·class="p"·data-group-id="9631761190-11">]</span><span·class="p">,</span><span·class="w">
167 ·····</span><span·class="n">Doc</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8660389186-13">#{</span><span·class="n">DocLanguage</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">DocValue</span><span·class="p"·data-group-id="8660389186-13">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">none</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">hidden</span><span·class="p">,</span><span·class="w">167 ·····</span><span·class="n">Doc</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9631761190-13">#{</span><span·class="n">DocLanguage</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">DocValue</span><span·class="p"·data-group-id="9631761190-13">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">none</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">hidden</span><span·class="p">,</span><span·class="w">
168 ·····</span><span·class="n">Metadata</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">map</span><span·class="p"·data-group-id="8660389186-14">(</span><span·class="p"·data-group-id="8660389186-14">)</span><span·class="w">168 ·····</span><span·class="n">Metadata</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">map</span><span·class="p"·data-group-id="9631761190-14">(</span><span·class="p"·data-group-id="9631761190-14">)</span><span·class="w">
169 ····</span><span·class="p"·data-group-id="8660389186-8">}</span><span·class="p"·data-group-id="8660389186-7">]</span><span·class="p"·data-group-id="8660389186-1">}</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">DocLanguage</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·202,·SHA:·66513397773fa9682555563f5ad4866fb465ab5c3b06fa8afedf7e4c3f381a8a·...·]-15">)</span><span·class="p">,</span><span·class="w">169 ····</span><span·class="p"·data-group-id="9631761190-8">}</span><span·class="p"·data-group-id="9631761190-7">]</span><span·class="p"·data-group-id="9631761190-1">}</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">DocLanguage</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·202,·SHA:·65dd7cbe9e04e57d7819087a1ac6af197d2a007d4bebe812446403aa864e6c36·...·]-15">)</span><span·class="p">,</span><span·class="w">
170 ·············</span><span·class="n">DocValue</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="8660389186-16">(</span><span·class="p"·data-group-id="8660389186-16">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="8660389186-17">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·c7130a069051473654b59b88746036c1cc524422458e3436661af815d4c5bea4·...·]-17">)</span></code></pre><p>where·in·the·root·tuple·we·have:</p><ul><li><p><strong><code·class="inline">Anno</code></strong>·-·annotation·(line,·column,·file)·of·the·definition·itself·(see170 ·············</span><span·class="n">DocValue</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="9631761190-16">(</span><span·class="p"·data-group-id="9631761190-16">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="9631761190-17">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·bcad4f50579a8a25a6b6fa806d9f2213321720e744c051452d957049ca5f21e7·...·]-17">)</span></code></pre><p>where·in·the·root·tuple·we·have:</p><ul><li><p><strong><code·class="inline">Anno</code></strong>·-·annotation·(line,·column,·file)·of·the·definition·itself·(see
171 <a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_anno.html"><code·class="inline">erl_anno</code></a>)</p></li><li><p><strong><code·class="inline">BeamLanguage</code></strong>·-·an·atom·representing·the·language,·for·example:·<code·class="inline">erlang</code>,171 <a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_anno.html"><code·class="inline">erl_anno</code></a>)</p></li><li><p><strong><code·class="inline">BeamLanguage</code></strong>·-·an·atom·representing·the·language,·for·example:·<code·class="inline">erlang</code>,
172 <code·class="inline">elixir</code>,·<code·class="inline">lfe</code>,·<code·class="inline">alpaca</code>,·and·so·on</p></li><li><p><strong><code·class="inline">Format</code></strong>·-·the·mime·type·of·the·documentation,·such·as·<code·class="inline">&lt;&lt;&quot;text/markdown&quot;&gt;&gt;</code>172 <code·class="inline">elixir</code>,·<code·class="inline">lfe</code>,·<code·class="inline">alpaca</code>,·and·so·on</p></li><li><p><strong><code·class="inline">Format</code></strong>·-·the·mime·type·of·the·documentation,·such·as·<code·class="inline">&lt;&lt;&quot;text/markdown&quot;&gt;&gt;</code>
173 or·<code·class="inline">&lt;&lt;&quot;application/erlang+html&quot;&gt;&gt;</code>.·For·details·of·the·format·used·by·Erlang173 or·<code·class="inline">&lt;&lt;&quot;application/erlang+html&quot;&gt;&gt;</code>.·For·details·of·the·format·used·by·Erlang
174 see·the·<a·href="../../../../lib/edoc-1.3.2/doc/html/doc_storage.html"><code·class="inline">EEP-48·Chapter</code></a>·in·EDoc's·User's174 see·the·<a·href="../../../../lib/edoc-1.3.2/doc/html/doc_storage.html"><code·class="inline">EEP-48·Chapter</code></a>·in·EDoc's·User's
175 Guide.</p></li><li><p><strong><code·class="inline">ModuleDoc</code></strong>·-·a·map·with·the·documentation·language·as·key,·such·as175 Guide.</p></li><li><p><strong><code·class="inline">ModuleDoc</code></strong>·-·a·map·with·the·documentation·language·as·key,·such·as
176 <code·class="inline">&lt;&lt;&quot;en&quot;&gt;&gt;</code>·or·<code·class="inline">&lt;&lt;&quot;pt_BR&quot;&gt;&gt;</code>,·and·the·documentation·as·a·binary·value.·It·can176 <code·class="inline">&lt;&lt;&quot;en&quot;&gt;&gt;</code>·or·<code·class="inline">&lt;&lt;&quot;pt_BR&quot;&gt;&gt;</code>,·and·the·documentation·as·a·binary·value.·It·can
177 be·atom·<code·class="inline">none</code>·if·no·documentation·exists·or·the·atom·<code·class="inline">hidden</code>·if177 be·atom·<code·class="inline">none</code>·if·no·documentation·exists·or·the·atom·<code·class="inline">hidden</code>·if
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258 ······<p·class="built-using">258 ······<p·class="built-using">
259 ········Built·using259 ········Built·using
260 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the260 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
261 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>261 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
262 ······</p>262 ······</p>
263 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>263 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
264 ····</footer>264 ····</footer>
265 ··</div>265 ··</div>
266 </main>266 </main>
267 </div>267 </div>
268 <script>268 <script>
269 ··function·mermaidLoaded()·{269 ··function·mermaidLoaded()·{
270 ····mermaid.initialize({270 ····mermaid.initialize({
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399 ······<p·class="built-using">399 ······<p·class="built-using">
400 ········Built·using400 ········Built·using
401 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the401 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
402 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>402 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
403 ······</p>403 ······</p>
404 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>404 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
405 ····</footer>405 ····</footer>
406 ··</div>406 ··</div>
407 </main>407 </main>
408 </div>408 </div>
409 <script>409 <script>
410 ··function·mermaidLoaded()·{410 ··function·mermaidLoaded()·{
411 ····mermaid.initialize({411 ····mermaid.initialize({
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1311 ······<p·class="built-using">1311 ······<p·class="built-using">
1312 ········Built·using1312 ········Built·using
1313 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1313 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1314 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1314 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1315 ······</p>1315 ······</p>
1316 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1316 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1317 ····</footer>1317 ····</footer>
1318 ··</div>1318 ··</div>
1319 </main>1319 </main>
1320 </div>1320 </div>
1321 <script>1321 <script>
1322 ··function·mermaidLoaded()·{1322 ··function·mermaidLoaded()·{
1323 ····mermaid.initialize({1323 ····mermaid.initialize({
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351 ···················Reason·::·address·|·<a·href="file.html#t:posix/0">file:posix</a>().</pre>351 ···················Reason·::·address·|·<a·href="file.html#t:posix/0">file:posix</a>().</pre>
  
352 ······</div>352 ······</div>
  
353 <p>Called·by·<a·href="net_adm.html"><code·class="inline">net_adm:names/0</code></a>.·<code·class="inline">Host</code>·defaults·to·the·localhost.353 <p>Called·by·<a·href="net_adm.html"><code·class="inline">net_adm:names/0</code></a>.·<code·class="inline">Host</code>·defaults·to·the·localhost.
354 Returns·the·names·and·associated·port·numbers·of·the·Erlang·nodes·that·<code·class="inline">epmd</code>354 Returns·the·names·and·associated·port·numbers·of·the·Erlang·nodes·that·<code·class="inline">epmd</code>
355 registered·at·the·specified·host.·Returns·<code·class="inline">{error,·address}</code>·if·<code·class="inline">epmd</code>·is·not355 registered·at·the·specified·host.·Returns·<code·class="inline">{error,·address}</code>·if·<code·class="inline">epmd</code>·is·not
356 operational.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(arne@dunn)1&gt;·</span><span·class="nc">erl_epmd</span><span·class="p">:</span><span·class="nf">names</span><span·class="p"·data-group-id="2636423267-1">(</span><span·class="ss">localhost</span><span·class="p"·data-group-id="2636423267-1">)</span><span·class="p">.</span><span·class="w">356 operational.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(arne@dunn)1&gt;·</span><span·class="nc">erl_epmd</span><span·class="p">:</span><span·class="nf">names</span><span·class="p"·data-group-id="2019370119-1">(</span><span·class="ss">localhost</span><span·class="p"·data-group-id="2019370119-1">)</span><span·class="p">.</span><span·class="w">
357 </span><span·class="p"·data-group-id="2636423267-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2636423267-3">[</span><span·class="p"·data-group-id="2636423267-4">{</span><span·class="s">&quot;arne&quot;</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·160,·SHA:·a6461c992bdcb87ca139cce77b49e28d03f000e0b0489fd927db0e8b82fc3da9·...·]-2">}</span></code></pre>357 </span><span·class="p"·data-group-id="2019370119-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2019370119-3">[</span><span·class="p"·data-group-id="2019370119-4">{</span><span·class="s">&quot;arne&quot;</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·160,·SHA:·43b0f084025b2c7c94a39a4f45b19833993b8dce17b8de6a26319f92544efe07·...·]-2">}</span></code></pre>
358 ··</section>358 ··</section>
359 </section>359 </section>
360 <section·class="detail"·id="port_please/2">360 <section·class="detail"·id="port_please/2">
  
361 ··<div·class="detail-header">361 ··<div·class="detail-header">
362 ····<a·href="#port_please/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">362 ····<a·href="#port_please/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
363 ······<i·class="ri-link-m"·aria-hidden="true"></i>363 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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550 ······<p·class="built-using">550 ······<p·class="built-using">
551 ········Built·using551 ········Built·using
552 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the552 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
553 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>553 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
554 ······</p>554 ······</p>
555 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>555 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
556 ····</footer>556 ····</footer>
557 ··</div>557 ··</div>
558 </main>558 </main>
559 </div>559 </div>
560 <script>560 <script>
561 ··function·mermaidLoaded()·{561 ··function·mermaidLoaded()·{
562 ····mermaid.initialize({562 ····mermaid.initialize({
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1183 at·the·client·side.</li></ul><p>The·call·<code·class="inline">erpc:multicall(Nodes,·Module,·Function,·Args)</code>·is·equivalent·to·the1183 at·the·client·side.</li></ul><p>The·call·<code·class="inline">erpc:multicall(Nodes,·Module,·Function,·Args)</code>·is·equivalent·to·the
1184 call·<code·class="inline">erpc:multicall(Nodes,·Module,·Function,·Args,·infinity)</code>.·These·calls·are1184 call·<code·class="inline">erpc:multicall(Nodes,·Module,·Function,·Args,·infinity)</code>.·These·calls·are
1185 also·equivalent·to·calling·<code·class="inline">my_multicall(Nodes,·Module,·Function,·Args)</code>·below1185 also·equivalent·to·calling·<code·class="inline">my_multicall(Nodes,·Module,·Function,·Args)</code>·below
1186 if·one·disregard·performance·and·failure·behavior.·<code·class="inline">multicall()</code>·can·utilize·a1186 if·one·disregard·performance·and·failure·behavior.·<code·class="inline">multicall()</code>·can·utilize·a
1187 selective·receive·optimization·which·removes·the·need·to·scan·the·message·queue1187 selective·receive·optimization·which·removes·the·need·to·scan·the·message·queue
1188 from·the·beginning·in·order·to·find·a·matching·message.·The1188 from·the·beginning·in·order·to·find·a·matching·message.·The
1189 <code·class="inline">send_request()/receive_response()</code>·combination·can,·however,·not·utilize·this1189 <code·class="inline">send_request()/receive_response()</code>·combination·can,·however,·not·utilize·this
1190 optimization.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_multicall</span><span·class="p"·data-group-id="1733179286-1">(</span><span·class="n">Nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·65,·SHA:·4caf171c37ef4517b37983c5356b4c13ebbbd08656aba0f5b32ee4f0b54851f9·...·]6-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1190 optimization.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_multicall</span><span·class="p"·data-group-id="7339929316-1">(</span><span·class="n">Nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·65,·SHA:·86f8ff44479f4b3409c622309edabb3ee554b98593b9a0303fc905672d2f56ff·...·]6-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1191 ··</span><span·class="n">ReqIds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="1733179286-2">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1733179286-3">(</span><span·class="n">Node</span><span·class="p"·data-group-id="1733179286-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1191 ··</span><span·class="n">ReqIds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="7339929316-2">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7339929316-3">(</span><span·class="n">Node</span><span·class="p"·data-group-id="7339929316-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1192 ·······················</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">send_request</span><span·class="p"·data-group-id="1733179286-4">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·64,·SHA:·d76a349a8e022cbf2bd1f516b39c1adf504f0059db743eda9cded3a902489768·...·]6-4">)</span><span·class="w">1192 ·······················</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">send_request</span><span·class="p"·data-group-id="7339929316-4">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·64,·SHA:·4407038baafed375ee9f366ce1567ba343b5b836e294e2180e378ca5712fecf4·...·]6-4">)</span><span·class="w">
1193 ·····················</span><span·class="k">end</span><span·class="p">,</span><span·class="w">1193 ·····················</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
1194 ·····················</span><span·class="n">Nodes</span><span·class="p"·data-group-id="1733179286-2">)</span><span·class="p">,</span><span·class="w">1194 ·····················</span><span·class="n">Nodes</span><span·class="p"·data-group-id="7339929316-2">)</span><span·class="p">,</span><span·class="w">
1195 ··</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="1733179286-5">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1733179286-6">(</span><span·class="n">ReqId</span><span·class="p"·data-group-id="1733179286-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1195 ··</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="7339929316-5">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7339929316-6">(</span><span·class="n">ReqId</span><span·class="p"·data-group-id="7339929316-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1196 ··············</span><span·class="k">try</span><span·class="w">1196 ··············</span><span·class="k">try</span><span·class="w">
1197 ················</span><span·class="p"·data-group-id="1733179286-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">receive_response</span><span·class="p"·data-group-id="1733179286-8">(</span><span·class="n"[·...·truncated·by·diffoscope;·len:·186,·SHA:·747ebc257c40ad9e1d7417d2d442f3ad2ab770faea6957ba98ad3fb84c42e478·...·]6-7">}</span><span·class="w">1197 ················</span><span·class="p"·data-group-id="7339929316-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">receive_response</span><span·class="p"·data-group-id="7339929316-8">(</span><span·class="n"[·...·truncated·by·diffoscope;·len:·186,·SHA:·7ca5c3a17301443905f8c50dd2d65c18f7b98911d4771e0fd836378dd22fb001·...·]6-7">}</span><span·class="w">
1198 ··············</span><span·class="k">catch</span><span·class="w">1198 ··············</span><span·class="k">catch</span><span·class="w">
1199 ················</span><span·class="n">Class</span><span·class="p">:</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1199 ················</span><span·class="n">Class</span><span·class="p">:</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1200 ··················</span><span·class="p"·data-group-id="1733179286-9">{</span><span·class="n">Class</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="1733179286-9">}</span><span·class="w">1200 ··················</span><span·class="p"·data-group-id="7339929316-9">{</span><span·class="n">Class</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="7339929316-9">}</span><span·class="w">
1201 ··············</span><span·class="k">end</span><span·class="w">1201 ··············</span><span·class="k">end</span><span·class="w">
1202 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">1202 ············</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
1203 ············</span><span·class="n">ReqIds</span><span·class="p"·data-group-id="1733179286-5">)</span><span·class="p">.</span></code></pre><p>If·an·<code·class="inline">erpc</code>·operation·fails,·but·it·is·unknown·if·the·function·is/will·be1203 ············</span><span·class="n">ReqIds</span><span·class="p"·data-group-id="7339929316-5">)</span><span·class="p">.</span></code></pre><p>If·an·<code·class="inline">erpc</code>·operation·fails,·but·it·is·unknown·if·the·function·is/will·be
1204 applied·(that·is,·a·timeout,·connection·loss,·or·an·improper·<code·class="inline">Nodes</code>·list),·the1204 applied·(that·is,·a·timeout,·connection·loss,·or·an·improper·<code·class="inline">Nodes</code>·list),·the
1205 caller·will·not·receive·any·further·information·about·the·result·if/when·the1205 caller·will·not·receive·any·further·information·about·the·result·if/when·the
1206 applied·function·completes.·If·the·applied·function·communicates·with·the1206 applied·function·completes.·If·the·applied·function·communicates·with·the
1207 calling·process,·such·communication·may,·of·course,·reach·the·calling·process.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the1207 calling·process,·such·communication·may,·of·course,·reach·the·calling·process.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the
1208 <code·class="inline">apply()</code>.·It·may·be·the·calling·process·itself,·a·server,·or·a·freshly1208 <code·class="inline">apply()</code>.·It·may·be·the·calling·process·itself,·a·server,·or·a·freshly
1209 spawned·process.</p></section>1209 spawned·process.</p></section>
1210 ··</section>1210 ··</section>
Offset 1346, 17 lines modifiedOffset 1346, 17 lines modified
1346 exception·if/when·an·invalid·<code·class="inline">RequestId</code>·is·detected·or·if·an·invalid·<code·class="inline">Timeout</code>1346 exception·if/when·an·invalid·<code·class="inline">RequestId</code>·is·detected·or·if·an·invalid·<code·class="inline">Timeout</code>
1347 is·passed.</p><p>A·call·to·the·function·<code·class="inline">my_call(Node,·Module,·Function,·Args,·Timeout)</code>·below·is1347 is·passed.</p><p>A·call·to·the·function·<code·class="inline">my_call(Node,·Module,·Function,·Args,·Timeout)</code>·below·is
1348 equivalent·to·the·call1348 equivalent·to·the·call
1349 <a·href="#call/5"><code·class="inline">erpc:call(Node,·Module,·Function,·Args,·Timeout)</code></a>·if·one·disregards1349 <a·href="#call/5"><code·class="inline">erpc:call(Node,·Module,·Function,·Args,·Timeout)</code></a>·if·one·disregards
1350 performance.·<code·class="inline">call()</code>·can·utilize·a·selective·receive·optimization·which·removes1350 performance.·<code·class="inline">call()</code>·can·utilize·a·selective·receive·optimization·which·removes
1351 the·need·to·scan·the·message·queue·from·the·beginning·in·order·to·find·a1351 the·need·to·scan·the·message·queue·from·the·beginning·in·order·to·find·a
1352 matching·message.·The·<code·class="inline">send_request()/receive_response()</code>·combination·can,1352 matching·message.·The·<code·class="inline">send_request()/receive_response()</code>·combination·can,
1353 however,·not·utilize·this·optimization.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_call</span><span·class="p"·data-group-id="8653000797-1">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·143,·SHA:·d697d36d663dbf7a971d77a20ca80bf1a714e8e570a8b9ec1104d1d16c3582f4·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1353 however,·not·utilize·this·optimization.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_call</span><span·class="p"·data-group-id="1907182845-1">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·143,·SHA:·60b3562838a98f316bdac93a480bf626551b3f819121eb91c06af564f36a9725·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1354 ··</span><span·class="n">RequestId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">send_request</span><span·class="p"·data-group-id="8653000797-2">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·65,·SHA:·3b6faff47617ed78001b3d40ccfe2ac531f6749392fb38142af13c87357f70f4·...·]-2">)</span><span·class="p">,</span><span·class="w">1354 ··</span><span·class="n">RequestId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">send_request</span><span·class="p"·data-group-id="1907182845-2">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·65,·SHA:·92b95ba88bac67d426b02521ebb56c562f18c18c1c2b6334d6f356fe22ce7c2d·...·]-2">)</span><span·class="p">,</span><span·class="w">
1355 ··</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">receive_response</span><span·class="p"·data-group-id="8653000797-3">(</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="p"·data-group-id="8653000797-3">)</span><span·class="p">.</span></code></pre><p>If·the·<code·class="inline">erpc</code>·operation·fails,·but·it·is·unknown·if·the·function·is/will·be1355 ··</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">receive_response</span><span·class="p"·data-group-id="1907182845-3">(</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="p"·data-group-id="1907182845-3">)</span><span·class="p">.</span></code></pre><p>If·the·<code·class="inline">erpc</code>·operation·fails,·but·it·is·unknown·if·the·function·is/will·be
1356 applied·(that·is,·a·timeout,·or·a·connection·loss),·the·caller·will·not·receive1356 applied·(that·is,·a·timeout,·or·a·connection·loss),·the·caller·will·not·receive
1357 any·further·information·about·the·result·if/when·the·applied·function·completes.1357 any·further·information·about·the·result·if/when·the·applied·function·completes.
1358 If·the·applied·function·explicitly·communicates·with·the·calling·process,·such1358 If·the·applied·function·explicitly·communicates·with·the·calling·process,·such
1359 communication·may,·of·course,·reach·the·calling·process.</p>1359 communication·may,·of·course,·reach·the·calling·process.</p>
1360 ··</section>1360 ··</section>
1361 </section>1361 </section>
1362 <section·class="detail"·id="receive_response/3">1362 <section·class="detail"·id="receive_response/3">
Offset 1637, 17 lines modifiedOffset 1637, 17 lines modified
1637 about·to·save·the·request·identifier·in·a·request·identifier·collection,·you·may1637 about·to·save·the·request·identifier·in·a·request·identifier·collection,·you·may
1638 want·to·consider·using·<a·href="#send_request/6"><code·class="inline">send_request/6</code></a>·instead.</p><p>A·call·to·the·function·<code·class="inline">my_call(Node,·Module,·Function,·Args,·Timeout)</code>·below·is1638 want·to·consider·using·<a·href="#send_request/6"><code·class="inline">send_request/6</code></a>·instead.</p><p>A·call·to·the·function·<code·class="inline">my_call(Node,·Module,·Function,·Args,·Timeout)</code>·below·is
1639 equivalent·to·the·call1639 equivalent·to·the·call
1640 <a·href="#call/5"><code·class="inline">erpc:call(Node,·Module,·Function,·Args,·Timeout)</code></a>·if·one·disregards1640 <a·href="#call/5"><code·class="inline">erpc:call(Node,·Module,·Function,·Args,·Timeout)</code></a>·if·one·disregards
1641 performance.·<code·class="inline">call()</code>·can·utilize·a·selective·receive·optimization·which·removes1641 performance.·<code·class="inline">call()</code>·can·utilize·a·selective·receive·optimization·which·removes
1642 the·need·to·scan·the·message·queue·from·the·beginning·in·order·to·find·a1642 the·need·to·scan·the·message·queue·from·the·beginning·in·order·to·find·a
1643 matching·message.·The·<code·class="inline">send_request()/receive_response()</code>·combination·can,1643 matching·message.·The·<code·class="inline">send_request()/receive_response()</code>·combination·can,
1644 however,·not·utilize·this·optimization.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_call</span><span·class="p"·data-group-id="9460864908-1">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·86ce9aa85d5e0cfd6ddd77644515b3b5721d9d83990f1fd5a25667c8b7650390·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1644 however,·not·utilize·this·optimization.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_call</span><span·class="p"·data-group-id="9670128003-1">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·14275ac02a31b06f8b42574e77b7d66557e5a8262be64dc3d7c571e4618d9051·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1645 ··</span><span·class="n">RequestId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">send_request</span><span·class="p"·data-group-id="9460864908-2">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·64,·SHA:·90d5cbd6b0ad3e9883884da1743735af3a1789d72d8dfaa49d94598e6867f5fd·...·]-2">)</span><span·class="p">,</span><span·class="w">1645 ··</span><span·class="n">RequestId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">send_request</span><span·class="p"·data-group-id="9670128003-2">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·64,·SHA:·af5fe64dde8a0807a10ef296115a3ce7e2c56e6077e888e360634d5c449eb30c·...·]-2">)</span><span·class="p">,</span><span·class="w">
1646 ··</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">receive_response</span><span·class="p"·data-group-id="9460864908-3">(</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="p"·data-group-id="9460864908-3">)</span><span·class="p">.</span></code></pre><p>Fails·with·an·<code·class="inline">{erpc,·badarg}</code>·<code·class="inline">error</code>·exception·if:</p><ul><li><code·class="inline">Node</code>·is·not·an·atom.</li><li><code·class="inline">Module</code>·is·not·an·atom.</li><li><code·class="inline">Function</code>·is·not·an·atom.</li><li><code·class="inline">Args</code>·is·not·a·list.·Note·that·the·list·is·not·verified·to·be·a·proper·list1646 ··</span><span·class="nc">erpc</span><span·class="p">:</span><span·class="nf">receive_response</span><span·class="p"·data-group-id="9670128003-3">(</span><span·class="n">RequestId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="p"·data-group-id="9670128003-3">)</span><span·class="p">.</span></code></pre><p>Fails·with·an·<code·class="inline">{erpc,·badarg}</code>·<code·class="inline">error</code>·exception·if:</p><ul><li><code·class="inline">Node</code>·is·not·an·atom.</li><li><code·class="inline">Module</code>·is·not·an·atom.</li><li><code·class="inline">Function</code>·is·not·an·atom.</li><li><code·class="inline">Args</code>·is·not·a·list.·Note·that·the·list·is·not·verified·to·be·a·proper·list
1647 at·the·client·side.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the1647 at·the·client·side.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the
1648 <code·class="inline">apply()</code>.·It·may·be·a·server,·or·a·freshly·spawned·process.</p></section><p>Equivalent·to1648 <code·class="inline">apply()</code>.·It·may·be·a·server,·or·a·freshly·spawned·process.</p></section><p>Equivalent·to
1649 <a·href="#send_request/6"><code·class="inline">erpc:send_request(Node,·erlang,·apply,·[Fun,[]]),·Label,·RequestIdCollection)</code></a>.</p><p>Fails·with·an·<code·class="inline">{erpc,·badarg}</code>·<code·class="inline">error</code>·exception·if:</p><ul><li><code·class="inline">Node</code>·is·not·an·atom.</li><li><code·class="inline">Fun</code>·is·not·a·fun·of·zero·arity.</li><li><code·class="inline">RequestIdCollection</code>·is·detected·not·to·be·request·identifier·collection.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the1649 <a·href="#send_request/6"><code·class="inline">erpc:send_request(Node,·erlang,·apply,·[Fun,[]]),·Label,·RequestIdCollection)</code></a>.</p><p>Fails·with·an·<code·class="inline">{erpc,·badarg}</code>·<code·class="inline">error</code>·exception·if:</p><ul><li><code·class="inline">Node</code>·is·not·an·atom.</li><li><code·class="inline">Fun</code>·is·not·a·fun·of·zero·arity.</li><li><code·class="inline">RequestIdCollection</code>·is·detected·not·to·be·request·identifier·collection.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the
1650 <code·class="inline">apply()</code>.·It·may·be·a·server,·or·a·freshly·spawned·process.</p></section>1650 <code·class="inline">apply()</code>.·It·may·be·a·server,·or·a·freshly·spawned·process.</p></section>
1651 ··</section>1651 ··</section>
1652 </section>1652 </section>
1653 <section·class="detail"·id="send_request/6">1653 <section·class="detail"·id="send_request/6">
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1869 ······<p·class="built-using">1869 ······<p·class="built-using">
1870 ········Built·using1870 ········Built·using
1871 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1871 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1872 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1872 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1873 ······</p>1873 ······</p>
1874 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1874 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1875 ····</footer>1875 ····</footer>
1876 ··</div>1876 ··</div>
1877 </main>1877 </main>
1878 </div>1878 </div>
1879 <script>1879 <script>
1880 ··function·mermaidLoaded()·{1880 ··function·mermaidLoaded()·{
1881 ····mermaid.initialize({1881 ····mermaid.initialize({
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326 ········Built·using326 ········Built·using
327 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the327 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
328 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>328 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
329 ······</p>329 ······</p>
330 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>330 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
331 ····</footer>331 ····</footer>
332 ··</div>332 ··</div>
333 </main>333 </main>
334 </div>334 </div>
335 <script>335 <script>
336 ··function·mermaidLoaded()·{336 ··function·mermaidLoaded()·{
337 ····mermaid.initialize({337 ····mermaid.initialize({
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1207 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1207 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1208 ······</p>1208 ······</p>
1209 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1209 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1210 ····</footer>1210 ····</footer>
1211 ··</div>1211 ··</div>
1212 </main>1212 </main>
1213 </div>1213 </div>
1214 <script>1214 <script>
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176 running·its·file·server·as·slave·to·the·file·server·of·another·node,·and·the176 running·its·file·server·as·slave·to·the·file·server·of·another·node,·and·the
177 other·node·runs·on·some·other·host·machine,·they·can·have·different·file177 other·node·runs·on·some·other·host·machine,·they·can·have·different·file
178 systems.·However,·this·is·seldom·a·problem.</p></section><p><a·href="#open/2"><code·class="inline">open/2</code></a>·can·be·given·the·options·<code·class="inline">delayed_write</code>·and·<code·class="inline">read_ahead</code>·to·turn·on178 systems.·However,·this·is·seldom·a·problem.</p></section><p><a·href="#open/2"><code·class="inline">open/2</code></a>·can·be·given·the·options·<code·class="inline">delayed_write</code>·and·<code·class="inline">read_ahead</code>·to·turn·on
179 caching,·which·will·reduce·the·number·of·operating·system·calls·and·greatly179 caching,·which·will·reduce·the·number·of·operating·system·calls·and·greatly
180 improve·performance·for·small·reads·and·writes.·However,·the·overhead·won't180 improve·performance·for·small·reads·and·writes.·However,·the·overhead·won't
181 disappear·completely·and·it's·best·to·keep·the·number·of·file·operations·to·a181 disappear·completely·and·it's·best·to·keep·the·number·of·file·operations·to·a
182 minimum.·As·a·contrived·example,·the·following·function·writes·4MB·in·2.5182 minimum.·As·a·contrived·example,·the·following·function·writes·4MB·in·2.5
183 seconds·when·tested:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="3278884477-1">(</span><span·class="n">Name</span><span·class="p"·data-group-id="3278884477-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">183 seconds·when·tested:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="7176848003-1">(</span><span·class="n">Name</span><span·class="p"·data-group-id="7176848003-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
184 ····</span><span·class="p"·data-group-id="3278884477-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="3278884477-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·612,·SHA:·d135e455420a5c3d2f34662d1c8770b3513ef9b703063696872913c362207fbd·...·]-3">)</span><span·class="p">,</span><span·class="w">184 ····</span><span·class="p"·data-group-id="7176848003-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="7176848003-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·612,·SHA:·c396816983190a1308da4ff81c350f7c567649fb4c5e17c59ca1c0e61c14a601·...·]-3">)</span><span·class="p">,</span><span·class="w">
185 ····</span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="3278884477-5">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">·</span><span·class="ow">bsl</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="3278[·...·truncated·by·diffoscope;·len:·6,·SHA:·d6adcbdef2a17e3293554c464984a79ddec0a575a474824cfaf557fc7b800de2·...·]-5">)</span><span·class="p">,</span><span·class="w">185 ····</span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="7176848003-5">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">·</span><span·class="ow">bsl</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="7176[·...·truncated·by·diffoscope;·len:·6,·SHA:·04ec5c365375d55af6e1dd51e2761886b879f3a45b11e2d317227b11218259d1·...·]-5">)</span><span·class="p">,</span><span·class="w">
186 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3278884477-6">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="3278884477-6">)</span><span·class="p">.</span><span·class="w">186 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="7176848003-6">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="7176848003-6">)</span><span·class="p">.</span><span·class="w">
  
187 </span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="3278884477-7">(</span><span·class="p">_</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="3278884477-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">187 </span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="7176848003-7">(</span><span·class="p">_</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="7176848003-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
188 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">188 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
189 </span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="3278884477-8">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="3278884477-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">189 </span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="7176848003-8">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="7176848003-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
190 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="3278884477-9">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3278884477-10">&lt;&lt;</span><span·class="mi">0</span><span·class="p"·data-group-id="3278884477-10">&gt;&gt;</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·030f229383fe6c1607ff2c36d081bbcf0017e85ed83b040cf8b83dcfd070bb09·...·]-9">)</span><span·class="p">,</span><span·class="w">190 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7176848003-9">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7176848003-10">&lt;&lt;</span><span·class="mi">0</span><span·class="p"·data-group-id="7176848003-10">&gt;&gt;</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·9799eecc50fc95dad39568063a59d2fdcc11de9644f93e3f36ddeb108c482b74·...·]-9">)</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="3278884477-11">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="32788844[·...·truncated·by·diffoscope;·len:·2,·SHA:·a88a7902cb4ef697ba0b6759c50e8c10297ff58f942243de19b984841bfe1f73·...·]-11">)</span><span·class="p">.</span></code></pre><p>The·following·functionally·equivalent·code·writes·128·bytes·per·call·to191 ····</span><span·class="nf">create_file_slow_1</span><span·class="p"·data-group-id="7176848003-11">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="71768480[·...·truncated·by·diffoscope;·len:·2,·SHA:·0b8efa5a3bf104413a725c6ff0459a6be12b1fd33314cbb138745baf39504ae5·...·]-11">)</span><span·class="p">.</span></code></pre><p>The·following·functionally·equivalent·code·writes·128·bytes·per·call·to
192 <a·href="#write/2"><code·class="inline">write/2</code></a>·and·so·does·the·same·work·in·0.08·seconds,·which·is·roughly·30·times192 <a·href="#write/2"><code·class="inline">write/2</code></a>·and·so·does·the·same·work·in·0.08·seconds,·which·is·roughly·30·times
193 faster:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">create_file</span><span·class="p"·data-group-id="0566280443-1">(</span><span·class="n">Name</span><span·class="p"·data-group-id="0566280443-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 faster:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">create_file</span><span·class="p"·data-group-id="3489908363-1">(</span><span·class="n">Name</span><span·class="p"·data-group-id="3489908363-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ····</span><span·class="p"·data-group-id="0566280443-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="0566280443-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·611,·SHA:·a27ccb7a5bf37ded477ff24e93337fd1ed18132274dbb30bdcec1a3eeb007c26·...·]3-3">)</span><span·class="p">,</span><span·class="w">194 ····</span><span·class="p"·data-group-id="3489908363-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="3489908363-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·611,·SHA:·c20cb9c16de09b658365915b428fb066b08cfaf6078e0ac70b50296a2db41b0e·...·]3-3">)</span><span·class="p">,</span><span·class="w">
195 ····</span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="0566280443-5">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">·</span><span·class="ow">bsl</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="0566[·...·truncated·by·diffoscope;·len:·5,·SHA:·debdb4478191240cd9b11de0f97a1072597a8d72bee4ab8eae7e2ffb9d440337·...·]3-5">)</span><span·class="p">,</span><span·class="w">195 ····</span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="3489908363-5">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">·</span><span·class="ow">bsl</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="3489[·...·truncated·by·diffoscope;·len:·5,·SHA:·5c967d51d4eee45c6d59802a59747b4087cea67058dc408c78a9c5cc318a5562·...·]3-5">)</span><span·class="p">,</span><span·class="w">
196 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="0566280443-6">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="0566280443-6">)</span><span·class="p">,</span><span·class="w">196 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3489908363-6">(</span><span·class="n">Fd</span><span·class="p"·data-group-id="3489908363-6">)</span><span·class="p">,</span><span·class="w">
197 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">197 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
198 </span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="0566280443-7">(</span><span·class="p">_</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="0566280443-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 </span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="3489908363-7">(</span><span·class="p">_</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="3489908363-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">199 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
200 </span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="0566280443-8">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="0566280443-8">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">128</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">200 </span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="3489908363-8">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="3489908363-8">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">128</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
201 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="0566280443-9">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0566280443-10">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="p"·data-group-id="0566280443-11">(</sp[·...·truncated·by·diffoscope;·len:·286,·SHA:·4800693ed6ab388cffa1f8773f7fc344afe82b7742e978434130589e48db06f2·...·]3-9">)</span><span·class="p">,</span><span·class="w">201 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="3489908363-9">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3489908363-10">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="p"·data-group-id="3489908363-11">(</sp[·...·truncated·by·diffoscope;·len:·286,·SHA:·7d64a29c2dbba9723578b0907afc0062d3397686a14c224fb4b7142b1cc7e2c4·...·]3-9">)</span><span·class="p">,</span><span·class="w">
202 ····</span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="0566280443-12">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">128</span><span·class="p"·data-group-id="056628[·...·truncated·by·diffoscope;·len:·3,·SHA:·2ba3f4781ce765d0169aad8447a77f6bc36b04e158292483b1756ad0fa36e93a·...·]3-12">)</span><span·class="p">;</span><span·class="w">202 ····</span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="3489908363-12">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">128</span><span·class="p"·data-group-id="348990[·...·truncated·by·diffoscope;·len:·3,·SHA:·33eb7e4ae43f9873d9c84c0f07b055946b24a71ca27daa60acbbf95b44c7c5e0·...·]3-12">)</span><span·class="p">;</span><span·class="w">
203 </span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="0566280443-13">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="0566280443-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">203 </span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="3489908363-13">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="3489908363-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
204 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="0566280443-14">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0566280443-15">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="p"·data-group-id="0566280443-16">(</s[·...·truncated·by·diffoscope;·len:·284,·SHA:·67d01f1bf36b83a318aadbc79b76efcf8c1ac396a88380616c4a9bcb85102b8c·...·]3-14">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="3489908363-14">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3489908363-15">&lt;&lt;</span><span·class="mi">0</span><span·class="p">:</span><span·class="p"·data-group-id="3489908363-16">(</s[·...·truncated·by·diffoscope;·len:·284,·SHA:·70da3f8ed3fda9d4b6824631682615273e3195e8d1b44ff38f96a75083d5397f·...·]3-14">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="0566280443-17">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="05662804[·...·truncated·by·diffoscope;·len:·1,·SHA:·4b227777d4dd1fc61c6f884f48641d02b4d121d3fd328cb08b5531fcacdabf8a·...·]3-17">)</span><span·class="p">.</span></code></pre><p>When·writing·data·it's·generally·more·efficient·to·write·a·list·of·binaries205 ····</span><span·class="nf">create_file_1</span><span·class="p"·data-group-id="3489908363-17">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="34899083[·...·truncated·by·diffoscope;·len:·1,·SHA:·e7f6c011776e8db7cd330b54174fd76f7d0216b612387a5ffcfb81e6f0919683·...·]3-17">)</span><span·class="p">.</span></code></pre><p>When·writing·data·it's·generally·more·efficient·to·write·a·list·of·binaries
206 rather·than·a·list·of·integers.·It·is·not·needed·to·flatten·a·deep·list·before206 rather·than·a·list·of·integers.·It·is·not·needed·to·flatten·a·deep·list·before
207 writing.·On·Unix·hosts,·scatter·output,·which·writes·a·set·of·buffers·in·one207 writing.·On·Unix·hosts,·scatter·output,·which·writes·a·set·of·buffers·in·one
208 operation,·is·used·when·possible.·In·this·way208 operation,·is·used·when·possible.·In·this·way
209 <a·href="#write/2"><code·class="inline">write(FD,·[Bin1,·Bin2·|·Bin3])</code></a>·writes·the·contents·of·the209 <a·href="#write/2"><code·class="inline">write(FD,·[Bin1,·Bin2·|·Bin3])</code></a>·writes·the·contents·of·the
210 binaries·without·copying·the·data·at·all,·except·for·perhaps·deep·down·in·the210 binaries·without·copying·the·data·at·all,·except·for·perhaps·deep·down·in·the
211 operating·system·kernel.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>If·an·error·occurs·when·accessing·an·open·file·with·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html"><code·class="inline">io</code></a>,·the·process211 operating·system·kernel.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>If·an·error·occurs·when·accessing·an·open·file·with·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html"><code·class="inline">io</code></a>,·the·process
212 handling·the·file·exits.·The·dead·file·process·can·hang·if·a·process·tries·to212 handling·the·file·exits.·The·dead·file·process·can·hang·if·a·process·tries·to
Offset 1956, 16 lines modifiedOffset 1956, 16 lines modified
1956 ······</div>1956 ······</div>
  
1957 <p>Reads·Erlang·terms,·separated·by·<code·class="inline">.</code>,·from·<code·class="inline">Filename</code>.·Returns·one·of·the1957 <p>Reads·Erlang·terms,·separated·by·<code·class="inline">.</code>,·from·<code·class="inline">Filename</code>.·Returns·one·of·the
1958 following:</p><ul><li><p><strong><code·class="inline">{ok,·Terms}</code></strong>·-·The·file·was·successfully·read.</p></li><li><p><strong><code·class="inline">{error,·atom()}</code></strong>·-·An·error·occurred·when·opening·the·file·or·reading·it.1958 following:</p><ul><li><p><strong><code·class="inline">{ok,·Terms}</code></strong>·-·The·file·was·successfully·read.</p></li><li><p><strong><code·class="inline">{error,·atom()}</code></strong>·-·An·error·occurred·when·opening·the·file·or·reading·it.
1959 For·a·list·of·typical·error·codes,·see·<a·href="#open/2"><code·class="inline">open/2</code></a>.</p></li><li><p><strong><code·class="inline">{error,·{Line,·Mod,·Term}}</code></strong>·-·An·error·occurred·when·interpreting·the1959 For·a·list·of·typical·error·codes,·see·<a·href="#open/2"><code·class="inline">open/2</code></a>.</p></li><li><p><strong><code·class="inline">{error,·{Line,·Mod,·Term}}</code></strong>·-·An·error·occurred·when·interpreting·the
1960 Erlang·terms·in·the·file.·To·convert·the·three-element·tuple·to·an·English1960 Erlang·terms·in·the·file.·To·convert·the·three-element·tuple·to·an·English
1961 description·of·the·error,·use·<a·href="#format_error/1"><code·class="inline">format_error/1</code></a>.</p></li></ul><p><em>Example:</em></p><pre><code·class="text">f.txt:··{person,·&quot;kalle&quot;,·25}.1961 description·of·the·error,·use·<a·href="#format_error/1"><code·class="inline">format_error/1</code></a>.</p></li></ul><p><em>Example:</em></p><pre><code·class="text">f.txt:··{person,·&quot;kalle&quot;,·25}.
1962 ········{person,·&quot;pelle&quot;,·30}.</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">consult</span><span·class="p"·data-group-id="0177196535-1">(</span><span·class="s">&quot;f.txt&quot;</span><span·class="p"·data-group-id="0177196535-1">)</span><span·class="p">.</span><span·class="w">1962 ········{person,·&quot;pelle&quot;,·30}.</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">consult</span><span·class="p"·data-group-id="3760229836-1">(</span><span·class="s">&quot;f.txt&quot;</span><span·class="p"·data-group-id="3760229836-1">)</span><span·class="p">.</span><span·class="w">
1963 </span><span·class="p"·data-group-id="0177196535-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0177196535-3">[</span><span·class="p"·data-group-id="0177196535-4">{</span><span·class="ss">person</span><span·class="p">,</span><span·class="s">&quot;ka[·...·truncated·by·diffoscope;·len:·487,·SHA:·72187bacc70acb49d8b52dcb53d52c7de4fa20f8bf00f775bb7740a0f6dbf3b3·...·]-2">}</span></code></pre><p>The·encoding·of·<code·class="inline">Filename</code>·can·be·set·by·a·comment,·as·described·in1963 </span><span·class="p"·data-group-id="3760229836-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3760229836-3">[</span><span·class="p"·data-group-id="3760229836-4">{</span><span·class="ss">person</span><span·class="p">,</span><span·class="s">&quot;ka[·...·truncated·by·diffoscope;·len:·487,·SHA:·e83f8ba5ed4b4a2ed68cb1e79f3a53eb8650124259cb0da9f662931ef9e26e2d·...·]-2">}</span></code></pre><p>The·encoding·of·<code·class="inline">Filename</code>·can·be·set·by·a·comment,·as·described·in
1964 <a·href="../../../../lib/stdlib-6.2.2/doc/html/epp.html#encoding"><code·class="inline">epp</code></a>.</p>1964 <a·href="../../../../lib/stdlib-6.2.2/doc/html/epp.html#encoding"><code·class="inline">epp</code></a>.</p>
1965 ··</section>1965 ··</section>
1966 </section>1966 </section>
1967 <section·class="detail"·id="copy/2">1967 <section·class="detail"·id="copy/2">
  
1968 ··<div·class="detail-header">1968 ··<div·class="detail-header">
1969 ····<a·href="#copy/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1969 ····<a·href="#copy/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 3246, 15 lines modifiedOffset 3246, 15 lines modified
3246 ····························FileInfo·::·<a·href="#t:file_info/0">file_info</a>(),3246 ····························FileInfo·::·<a·href="#t:file_info/0">file_info</a>(),
3247 ····························Reason·::·<a·href="#t:posix/0">posix</a>()·|·badarg.</pre>3247 ····························Reason·::·<a·href="#t:posix/0">posix</a>()·|·badarg.</pre>
  
3248 ······</div>3248 ······</div>
  
3249 <p>Retrieves·information·about·a·file.·Returns·<code·class="inline">{ok,·FileInfo}</code>·if·successful,3249 <p>Retrieves·information·about·a·file.·Returns·<code·class="inline">{ok,·FileInfo}</code>·if·successful,
3250 otherwise·<code·class="inline">{error,·Reason}</code>.</p><p><code·class="inline">FileInfo</code>·is·a·record·<code·class="inline">file_info</code>,·defined·in·the·Kernel·include·file·<code·class="inline">file.hrl</code>.3250 otherwise·<code·class="inline">{error,·Reason}</code>.</p><p><code·class="inline">FileInfo</code>·is·a·record·<code·class="inline">file_info</code>,·defined·in·the·Kernel·include·file·<code·class="inline">file.hrl</code>.
3251 Include·the·following·directive·in·the·module·from·which·the·function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="0621249671-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="0621249671-1">)</span><span·class="p">.</span></code></pre><p>The·time·type·returned·in·<code·class="inline">atime</code>,·<code·class="inline">mtime</code>,·and·<code·class="inline">ctime</code>·is·dependent·on·the·time3251 Include·the·following·directive·in·the·module·from·which·the·function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2781206499-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="2781206499-1">)</span><span·class="p">.</span></code></pre><p>The·time·type·returned·in·<code·class="inline">atime</code>,·<code·class="inline">mtime</code>,·and·<code·class="inline">ctime</code>·is·dependent·on·the·time
3252 type·set·in·<code·class="inline">Opts·::·{time,·Type}</code>·as·follows:</p><ul><li><p><strong><code·class="inline">local</code></strong>·-·Returns·local·time.</p></li><li><p><strong><code·class="inline">universal</code></strong>·-·Returns·universal·time.</p></li><li><p><strong><code·class="inline">posix</code></strong>·-·Returns·seconds·since·or·before·Unix·time·epoch,·which·is3252 type·set·in·<code·class="inline">Opts·::·{time,·Type}</code>·as·follows:</p><ul><li><p><strong><code·class="inline">local</code></strong>·-·Returns·local·time.</p></li><li><p><strong><code·class="inline">universal</code></strong>·-·Returns·universal·time.</p></li><li><p><strong><code·class="inline">posix</code></strong>·-·Returns·seconds·since·or·before·Unix·time·epoch,·which·is
3253 1970-01-01·00:00·UTC.</p></li></ul><p>Default·is·<code·class="inline">{time,·local}</code>.</p><p>If·the·option·<code·class="inline">raw</code>·is·set,·the·file·server·is·not·called·and·only·information3253 1970-01-01·00:00·UTC.</p></li></ul><p>Default·is·<code·class="inline">{time,·local}</code>.</p><p>If·the·option·<code·class="inline">raw</code>·is·set,·the·file·server·is·not·called·and·only·information
3254 about·local·files·is·returned.·Note·that·this·will·break·this·module's·atomicity3254 about·local·files·is·returned.·Note·that·this·will·break·this·module's·atomicity
3255 guarantees·as·it·can·race·with·a·concurrent·call·to3255 guarantees·as·it·can·race·with·a·concurrent·call·to
3256 <a·href="#write_file_info/2"><code·class="inline">write_file_info/1,2</code>·</a>.</p><p>This·option·has·no·effect·when·the·function·is·given·an·I/O·device·instead·of·a3256 <a·href="#write_file_info/2"><code·class="inline">write_file_info/1,2</code>·</a>.</p><p>This·option·has·no·effect·when·the·function·is·given·an·I/O·device·instead·of·a
3257 file·name.·Use·<a·href="#open/2"><code·class="inline">open/2</code></a>·with·the·<code·class="inline">raw</code>·mode·to·obtain·a·file·descriptor·first.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>As·file·times·are·stored·in·POSIX·time·on·most·OS,·it·is·faster·to·query·file3257 file·name.·Use·<a·href="#open/2"><code·class="inline">open/2</code></a>·with·the·<code·class="inline">raw</code>·mode·to·obtain·a·file·descriptor·first.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>As·file·times·are·stored·in·POSIX·time·on·most·OS,·it·is·faster·to·query·file
3258 information·with·option·<code·class="inline">posix</code>.</p></section><p>The·record·<code·class="inline">file_info</code>·contains·the·following·fields:</p><ul><li><p><strong><code·class="inline">size·=</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·Size·of·file·in·bytes.</p></li><li><p><strong><code·class="inline">type·=·device·|·directory·|·other·|·regular</code></strong>·-·The·type·of·the·file.·Can3258 information·with·option·<code·class="inline">posix</code>.</p></section><p>The·record·<code·class="inline">file_info</code>·contains·the·following·fields:</p><ul><li><p><strong><code·class="inline">size·=</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·Size·of·file·in·bytes.</p></li><li><p><strong><code·class="inline">type·=·device·|·directory·|·other·|·regular</code></strong>·-·The·type·of·the·file.·Can
Offset 3900, 15 lines modifiedOffset 3900, 15 lines modified
3900 ·····························Reason·::·<a·href="#t:posix/0">posix</a>()·|·badarg.</pre>3900 ·····························Reason·::·<a·href="#t:posix/0">posix</a>()·|·badarg.</pre>
  
3901 ······</div>3901 ······</div>
  
3902 <p>Changes·file·information.·Returns·<code·class="inline">ok</code>·if·successful,·otherwise3902 <p>Changes·file·information.·Returns·<code·class="inline">ok</code>·if·successful,·otherwise
3903 <code·class="inline">{error,·Reason}</code>.</p><p><code·class="inline">FileInfo</code>·is·a·record·<code·class="inline">file_info</code>,·defined·in·the·Kernel3903 <code·class="inline">{error,·Reason}</code>.</p><p><code·class="inline">FileInfo</code>·is·a·record·<code·class="inline">file_info</code>,·defined·in·the·Kernel
3904 include·file·<code·class="inline">file.hrl</code>.·Include·the·following·directive·in·the·module·from3904 include·file·<code·class="inline">file.hrl</code>.·Include·the·following·directive·in·the·module·from
3905 which·the·function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3816056021-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="3816056021-1">)</span><span·class="p">.</span></code></pre><p>The·time·type·set·in·<code·class="inline">atime</code>,·<code·class="inline">mtime</code>,·and·<code·class="inline">ctime</code>·depends·on·the·time·type·set3905 which·the·function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6663500747-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="6663500747-1">)</span><span·class="p">.</span></code></pre><p>The·time·type·set·in·<code·class="inline">atime</code>,·<code·class="inline">mtime</code>,·and·<code·class="inline">ctime</code>·depends·on·the·time·type·set
3906 in·<code·class="inline">Opts·::·{time,·Type}</code>·as·follows:</p><ul><li><p><strong><code·class="inline">local</code></strong>·-·Interprets·the·time·set·as·local.</p></li><li><p><strong><code·class="inline">universal</code></strong>·-·Interprets·it·as·universal·time.</p></li><li><p><strong><code·class="inline">posix</code></strong>·-·Must·be·seconds·since·or·before·Unix·time·epoch,·which·is3906 in·<code·class="inline">Opts·::·{time,·Type}</code>·as·follows:</p><ul><li><p><strong><code·class="inline">local</code></strong>·-·Interprets·the·time·set·as·local.</p></li><li><p><strong><code·class="inline">universal</code></strong>·-·Interprets·it·as·universal·time.</p></li><li><p><strong><code·class="inline">posix</code></strong>·-·Must·be·seconds·since·or·before·Unix·time·epoch,·which·is
3907 1970-01-01·00:00·UTC.</p></li></ul><p>Default·is·<code·class="inline">{time,·local}</code>.</p><p>If·the·option·<code·class="inline">raw</code>·is·set,·the·file·server·is·not·called·and·only·information3907 1970-01-01·00:00·UTC.</p></li></ul><p>Default·is·<code·class="inline">{time,·local}</code>.</p><p>If·the·option·<code·class="inline">raw</code>·is·set,·the·file·server·is·not·called·and·only·information
3908 about·local·files·is·returned.</p><p>The·following·fields·are·used·from·the·record,·if·they·are·specified:</p><ul><li><p><strong><code·class="inline">atime·=</code>·<a·href="#t:date_time/0"><code·class="inline">date_time/0</code></a>·<code·class="inline">|</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·The·last·time·the·file·was3908 about·local·files·is·returned.</p><p>The·following·fields·are·used·from·the·record,·if·they·are·specified:</p><ul><li><p><strong><code·class="inline">atime·=</code>·<a·href="#t:date_time/0"><code·class="inline">date_time/0</code></a>·<code·class="inline">|</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·The·last·time·the·file·was
3909 read.</p></li><li><p><strong><code·class="inline">mtime·=</code>·<a·href="#t:date_time/0"><code·class="inline">date_time/0</code></a>·<code·class="inline">|</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·The·last·time·the·file·was3909 read.</p></li><li><p><strong><code·class="inline">mtime·=</code>·<a·href="#t:date_time/0"><code·class="inline">date_time/0</code></a>·<code·class="inline">|</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·The·last·time·the·file·was
3910 written.</p></li><li><p><strong><code·class="inline">ctime·=</code>·<a·href="#t:date_time/0"><code·class="inline">date_time/0</code></a>·<code·class="inline">|</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·On·Unix,·any·value3910 written.</p></li><li><p><strong><code·class="inline">ctime·=</code>·<a·href="#t:date_time/0"><code·class="inline">date_time/0</code></a>·<code·class="inline">|</code>·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0"><code·class="inline">non_neg_integer/0</code></a></strong>·-·On·Unix,·any·value
3911 specified·for·this·field·is·ignored·(the·&quot;ctime&quot;·for·the·file·is·set·to·the3911 specified·for·this·field·is·ignored·(the·&quot;ctime&quot;·for·the·file·is·set·to·the
3912 current·time).·On·Windows,·this·field·is·the·new·creation·time·to·set·for·the3912 current·time).·On·Windows,·this·field·is·the·new·creation·time·to·set·for·the
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3942 ······<p·class="built-using">3942 ······<p·class="built-using">
3943 ········Built·using3943 ········Built·using
3944 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3944 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3945 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3945 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3946 ······</p>3946 ······</p>
3947 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3947 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3948 ····</footer>3948 ····</footer>
3949 ··</div>3949 ··</div>
3950 </main>3950 </main>
3951 </div>3951 </div>
3952 <script>3952 <script>
3953 ··function·mermaidLoaded()·{3953 ··function·mermaidLoaded()·{
3954 ····mermaid.initialize({3954 ····mermaid.initialize({
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132 The·implementation·assumes·that·the·OS·kernel·supports·SCTP132 The·implementation·assumes·that·the·OS·kernel·supports·SCTP
133 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">(RFC·2960)</a>133 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">(RFC·2960)</a>
134 through·the·user-level134 through·the·user-level
135 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions</a>.</p><p>During·development,·this·implementation·was·tested·on:</p><ul><li>Linux·Fedora·Core·5.0·(kernel·2.6.15-2054·or·later·is·needed)</li><li>Solaris·10,·11</li></ul><p>During·OTP·adaptation·it·was·tested·on:</p><ul><li>SUSE·Linux·Enterprise·Server·10·(x86_64)·kernel·2.6.16.27-0.6-smp,·with135 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions</a>.</p><p>During·development,·this·implementation·was·tested·on:</p><ul><li>Linux·Fedora·Core·5.0·(kernel·2.6.15-2054·or·later·is·needed)</li><li>Solaris·10,·11</li></ul><p>During·OTP·adaptation·it·was·tested·on:</p><ul><li>SUSE·Linux·Enterprise·Server·10·(x86_64)·kernel·2.6.16.27-0.6-smp,·with
136 lksctp-tools-1.0.6</li><li>Briefly·on·Solaris·10</li><li>SUSE·Linux·Enterprise·Server·10·Service·Pack·1·(x86_64)·kernel136 lksctp-tools-1.0.6</li><li>Briefly·on·Solaris·10</li><li>SUSE·Linux·Enterprise·Server·10·Service·Pack·1·(x86_64)·kernel
137 2.6.16.54-0.2.3-smp·with·lksctp-tools-1.0.7</li><li>FreeBSD·8.2</li></ul><p>This·module·was·written·for·one-to-many·style·sockets·(type·<code·class="inline">seqpacket</code>).137 2.6.16.54-0.2.3-smp·with·lksctp-tools-1.0.7</li><li>FreeBSD·8.2</li></ul><p>This·module·was·written·for·one-to-many·style·sockets·(type·<code·class="inline">seqpacket</code>).
138 With·the·addition·of·<a·href="#peeloff/2"><code·class="inline">peeloff/2</code></a>,·one-to-one·style·sockets·(type·<code·class="inline">stream</code>)138 With·the·addition·of·<a·href="#peeloff/2"><code·class="inline">peeloff/2</code></a>,·one-to-one·style·sockets·(type·<code·class="inline">stream</code>)
139 were·introduced.</p><p>Record·definitions·for·this·module·can·be·found·using:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8166765212-1">(</span><span·class="s">&quot;kernel/include/inet_sctp.hrl&quot;</span><span·class="p"·data-group-id="8166765212-1">)</span><span·class="p">.</span></code></pre><p>These·record·definitions·use·the·&quot;new&quot;·spelling·'adaptation',139 were·introduced.</p><p>Record·definitions·for·this·module·can·be·found·using:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6591480756-1">(</span><span·class="s">&quot;kernel/include/inet_sctp.hrl&quot;</span><span·class="p"·data-group-id="6591480756-1">)</span><span·class="p">.</span></code></pre><p>These·record·definitions·use·the·&quot;new&quot;·spelling·'adaptation',
140 not·the·deprecated·'adaption',·regardless·of·which·spelling140 not·the·deprecated·'adaption',·regardless·of·which·spelling
141 the·underlying·C·API·uses.</p><h2·id="module-sctp-socket-options"·class="section-heading">141 the·underlying·C·API·uses.</p><h2·id="module-sctp-socket-options"·class="section-heading">
142 ··<a·href="#module-sctp-socket-options"·class="hover-link">142 ··<a·href="#module-sctp-socket-options"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
144 ··</a>144 ··</a>
145 ··<span·class="text"><a·href=""·id="options"></a>·SCTP·Socket·Options</span>145 ··<span·class="text"><a·href=""·id="options"></a>·SCTP·Socket·Options</span>
146 </h2>146 </h2>
Offset 180, 39 lines modifiedOffset 180, 39 lines modified
180 the·driver·buffer·(see·<code·class="inline">buffer</code>·above).</p></li><li><p><strong><code·class="inline">{recbuf, integer()}</code></strong>·-·The·size,·in·bytes,·of·the·OS·kernel·receive180 the·driver·buffer·(see·<code·class="inline">buffer</code>·above).</p></li><li><p><strong><code·class="inline">{recbuf, integer()}</code></strong>·-·The·size,·in·bytes,·of·the·OS·kernel·receive
181 buffer·for·this·socket.·Sending·errors·would·occur·for·datagrams181 buffer·for·this·socket.·Sending·errors·would·occur·for·datagrams
182 larger·than·<code·class="inline">val(recbuf)</code>.·Setting·this·option·also·adjusts·the·size182 larger·than·<code·class="inline">val(recbuf)</code>.·Setting·this·option·also·adjusts·the·size
183 of·the·driver·buffer·(see·<code·class="inline">buffer</code>·above).</p></li></ul><h3·id="option_non_block_send"><a·href=""></a></h3><ul><li><p><strong><code·class="inline">{non_block_send, boolean()}</code></strong>·-·A·send·call·that·would·otherwise·block·(hang),183 of·the·driver·buffer·(see·<code·class="inline">buffer</code>·above).</p></li></ul><h3·id="option_non_block_send"><a·href=""></a></h3><ul><li><p><strong><code·class="inline">{non_block_send, boolean()}</code></strong>·-·A·send·call·that·would·otherwise·block·(hang),
184 will·instead·immediately·return·with·e.g.·<code·class="inline">{error,·eagain}</code>184 will·instead·immediately·return·with·e.g.·<code·class="inline">{error,·eagain}</code>
185 <em>if</em>·this·option·has·been·set·to·<code·class="inline">true</code>.185 <em>if</em>·this·option·has·been·set·to·<code·class="inline">true</code>.
186 Defaults·to·<code·class="inline">false</code>.</p></li><li><p><strong><code·class="inline">{sctp_module, module()}</code></strong>·-·Overrides·which·callback·module·is·used.186 Defaults·to·<code·class="inline">false</code>.</p></li><li><p><strong><code·class="inline">{sctp_module, module()}</code></strong>·-·Overrides·which·callback·module·is·used.
187 Defaults·to·<code·class="inline">inet_sctp</code>·for·IPv4·and·<code·class="inline">inet6_sctp</code>·for·IPv6.</p></li><li><p><strong><code·class="inline">{sctp_rtoinfo, #sctp_rtoinfo{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_rtoinfo</span><span·class="p"·data-group-id="0012590113-1">{</span><span·class="w">187 Defaults·to·<code·class="inline">inet_sctp</code>·for·IPv4·and·<code·class="inline">inet6_sctp</code>·for·IPv6.</p></li><li><p><strong><code·class="inline">{sctp_rtoinfo, #sctp_rtoinfo{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_rtoinfo</span><span·class="p"·data-group-id="6342321270-1">{</span><span·class="w">
188 ······</span><span·class="ss">assoc_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="0012590113-2">(</span><span·class="p"·data-group-id="0012590113-2">)</span><span·class="p">,</span><span·class="w">188 ······</span><span·class="ss">assoc_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="6342321270-2">(</span><span·class="p"·data-group-id="6342321270-2">)</span><span·class="p">,</span><span·class="w">
189 ······</span><span·class="ss">initial</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0012590113-3">(</span><span·class="p"·data-group-id="0012590113-3">)</span><span·class="p">,</span><span·class="w">189 ······</span><span·class="ss">initial</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6342321270-3">(</span><span·class="p"·data-group-id="6342321270-3">)</span><span·class="p">,</span><span·class="w">
190 ······</span><span·class="ss">max</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0012590113-4">(</span><span·class="p"·data-group-id="0012590113-4">)</span><span·class="p">,</span><span·class="w">190 ······</span><span·class="ss">max</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6342321270-4">(</span><span·class="p"·data-group-id="6342321270-4">)</span><span·class="p">,</span><span·class="w">
191 ······</span><span·class="ss">min</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0012590113-5">(</span><span·class="p"·data-group-id="0012590113-5">)</span><span·class="w">191 ······</span><span·class="ss">min</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6342321270-5">(</span><span·class="p"·data-group-id="6342321270-5">)</span><span·class="w">
192 </span><span·class="p"·data-group-id="0012590113-1">}</span></code></pre><p>Determines·retransmission·time-out·parameters,·in·milliseconds,·for·the192 </span><span·class="p"·data-group-id="6342321270-1">}</span></code></pre><p>Determines·retransmission·time-out·parameters,·in·milliseconds,·for·the
193 association(s)·specified·by·<code·class="inline">assoc_id</code>.</p><p><code·class="inline">assoc_id = 0</code>·(default)·indicates·the·whole·endpoint.·See193 association(s)·specified·by·<code·class="inline">assoc_id</code>.</p><p><code·class="inline">assoc_id = 0</code>·(default)·indicates·the·whole·endpoint.·See
194 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">RFC·2960</a>·and194 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">RFC·2960</a>·and
195 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>195 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>
196 for·the·exact·semantics·of·the·field·values.</p></li><li><p><strong><code·class="inline">{sctp_associnfo, #sctp_assocparams{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_assocparams</span><span·class="p"·data-group-id="8839104246-1">{</span><span·class="w">196 for·the·exact·semantics·of·the·field·values.</p></li><li><p><strong><code·class="inline">{sctp_associnfo, #sctp_assocparams{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_assocparams</span><span·class="p"·data-group-id="7892124222-1">{</span><span·class="w">
197 ······</span><span·class="ss">assoc_id</span><span·class="w">·················</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="8839104246-2">(</span><span·class="p"·data-group-id="8839104246-2">)</span><span·class="p">,</span><span·class="w">197 ······</span><span·class="ss">assoc_id</span><span·class="w">·················</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="7892124222-2">(</span><span·class="p"·data-group-id="7892124222-2">)</span><span·class="p">,</span><span·class="w">
198 ······</span><span·class="ss">asocmaxrxt</span><span·class="w">···············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8839104246-3">(</span><span·class="p"·data-group-id="8839104246-3">)</span><span·class="p">,</span><span·class="w">198 ······</span><span·class="ss">asocmaxrxt</span><span·class="w">···············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7892124222-3">(</span><span·class="p"·data-group-id="7892124222-3">)</span><span·class="p">,</span><span·class="w">
199 ······</span><span·class="ss">number_peer_destinations</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8839104246-4">(</span><span·class="p"·data-group-id="8839104246-4">)</span><span·class="p">,</span><span·class="w">199 ······</span><span·class="ss">number_peer_destinations</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7892124222-4">(</span><span·class="p"·data-group-id="7892124222-4">)</span><span·class="p">,</span><span·class="w">
200 ······</span><span·class="ss">peer_rwnd</span><span·class="w">················</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8839104246-5">(</span><span·class="p"·data-group-id="8839104246-5">)</span><span·class="p">,</span><span·class="w">200 ······</span><span·class="ss">peer_rwnd</span><span·class="w">················</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7892124222-5">(</span><span·class="p"·data-group-id="7892124222-5">)</span><span·class="p">,</span><span·class="w">
201 ······</span><span·class="ss">local_rwnd</span><span·class="w">···············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8839104246-6">(</span><span·class="p"·data-group-id="8839104246-6">)</span><span·class="p">,</span><span·class="w">201 ······</span><span·class="ss">local_rwnd</span><span·class="w">···············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7892124222-6">(</span><span·class="p"·data-group-id="7892124222-6">)</span><span·class="p">,</span><span·class="w">
202 ······</span><span·class="ss">cookie_life</span><span·class="w">··············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="8839104246-7">(</span><span·class="p"·data-group-id="8839104246-7">)</span><span·class="w">202 ······</span><span·class="ss">cookie_life</span><span·class="w">··············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7892124222-7">(</span><span·class="p"·data-group-id="7892124222-7">)</span><span·class="w">
203 </span><span·class="p"·data-group-id="8839104246-1">}</span></code></pre><p>Determines·association·parameters·for·the·association(s)·specified·by203 </span><span·class="p"·data-group-id="7892124222-1">}</span></code></pre><p>Determines·association·parameters·for·the·association(s)·specified·by
204 <code·class="inline">assoc_id</code>.</p><p><code·class="inline">assoc_id = 0</code>·(default)·indicates·the·whole·endpoint.·See204 <code·class="inline">assoc_id</code>.</p><p><code·class="inline">assoc_id = 0</code>·(default)·indicates·the·whole·endpoint.·See
205 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>205 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>
206 for·the·discussion·of·their·semantics.·Rarely·used.</p></li><li><p><strong><code·class="inline">{sctp_initmsg, #sctp_initmsg{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_initmsg</span><span·class="p"·data-group-id="9708520803-1">{</span><span·class="w">206 for·the·discussion·of·their·semantics.·Rarely·used.</p></li><li><p><strong><code·class="inline">{sctp_initmsg, #sctp_initmsg{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_initmsg</span><span·class="p"·data-group-id="9637808342-1">{</span><span·class="w">
207 ·····</span><span·class="ss">num_ostreams</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9708520803-2">(</span><span·class="p"·data-group-id="9708520803-2">)</span><span·class="p">,</span><span·class="w">207 ·····</span><span·class="ss">num_ostreams</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9637808342-2">(</span><span·class="p"·data-group-id="9637808342-2">)</span><span·class="p">,</span><span·class="w">
208 ·····</span><span·class="ss">max_instreams</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9708520803-3">(</span><span·class="p"·data-group-id="9708520803-3">)</span><span·class="p">,</span><span·class="w">208 ·····</span><span·class="ss">max_instreams</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9637808342-3">(</span><span·class="p"·data-group-id="9637808342-3">)</span><span·class="p">,</span><span·class="w">
209 ·····</span><span·class="ss">max_attempts</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9708520803-4">(</span><span·class="p"·data-group-id="9708520803-4">)</span><span·class="p">,</span><span·class="w">209 ·····</span><span·class="ss">max_attempts</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9637808342-4">(</span><span·class="p"·data-group-id="9637808342-4">)</span><span·class="p">,</span><span·class="w">
210 ·····</span><span·class="ss">max_init_timeo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9708520803-5">(</span><span·class="p"·data-group-id="9708520803-5">)</span><span·class="w">210 ·····</span><span·class="ss">max_init_timeo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9637808342-5">(</span><span·class="p"·data-group-id="9637808342-5">)</span><span·class="w">
211 </span><span·class="p"·data-group-id="9708520803-1">}</span></code></pre><p>Determines·the·default·parameters·that·this·socket·tries·to·negotiate211 </span><span·class="p"·data-group-id="9637808342-1">}</span></code></pre><p>Determines·the·default·parameters·that·this·socket·tries·to·negotiate
212 with·its·peer·while·establishing·an·association·with·it.·Is·to·be·set·after212 with·its·peer·while·establishing·an·association·with·it.·Is·to·be·set·after
213 <a·href="#open/1"><code·class="inline">open/*</code></a>·but·before·the·first·<a·href="#connect/4"><code·class="inline">connect/*</code></a>.213 <a·href="#open/1"><code·class="inline">open/*</code></a>·but·before·the·first·<a·href="#connect/4"><code·class="inline">connect/*</code></a>.
214 <code·class="inline">#sctp_initmsg{}</code>·can·also·be·used·as·ancillary·data·with·the·first·call·of214 <code·class="inline">#sctp_initmsg{}</code>·can·also·be·used·as·ancillary·data·with·the·first·call·of
215 <a·href="#send/3"><code·class="inline">send/*</code></a>·to·a·new·peer·(when·a·new·association·is·created).</p><ul><li><p><strong><code·class="inline">num_ostreams</code></strong>·-·Number·of·outbound·streams</p></li><li><p><strong><code·class="inline">max_instreams</code></strong>·-·Maximum·number·of·inbound·streams</p></li><li><p><strong><code·class="inline">max_attempts</code></strong>·-·Maximum·retransmissions·while·establishing·an215 <a·href="#send/3"><code·class="inline">send/*</code></a>·to·a·new·peer·(when·a·new·association·is·created).</p><ul><li><p><strong><code·class="inline">num_ostreams</code></strong>·-·Number·of·outbound·streams</p></li><li><p><strong><code·class="inline">max_instreams</code></strong>·-·Maximum·number·of·inbound·streams</p></li><li><p><strong><code·class="inline">max_attempts</code></strong>·-·Maximum·retransmissions·while·establishing·an
216 association</p></li><li><p><strong><code·class="inline">max_init_timeo</code></strong>·-·Time-out,·in·milliseconds,·for·establishing·an216 association</p></li><li><p><strong><code·class="inline">max_init_timeo</code></strong>·-·Time-out,·in·milliseconds,·for·establishing·an
217 association</p></li></ul></li><li><p><strong><code·class="inline">{sctp_autoclose, integer()·&gt;=·0}</code></strong>·-·Determines·the·time,·in·seconds,217 association</p></li></ul></li><li><p><strong><code·class="inline">{sctp_autoclose, integer()·&gt;=·0}</code></strong>·-·Determines·the·time,·in·seconds,
218 after·which·an·idle·association·is·automatically·closed.·<code·class="inline">0</code>·means·that·the218 after·which·an·idle·association·is·automatically·closed.·<code·class="inline">0</code>·means·that·the
Offset 221, 239 lines modifiedOffset 221, 239 lines modified
221 expense·of·latency.</p></li><li><p><strong><code·class="inline">{sctp_disable_fragments,·true|false}</code></strong>·-·If·<code·class="inline">true</code>,·induces·an·error·on·an221 expense·of·latency.</p></li><li><p><strong><code·class="inline">{sctp_disable_fragments,·true|false}</code></strong>·-·If·<code·class="inline">true</code>,·induces·an·error·on·an
222 attempt·to·send·a·message·larger·than·the·current·PMTU·size·(which·would222 attempt·to·send·a·message·larger·than·the·current·PMTU·size·(which·would
223 require·fragmentation/reassembling).·Notice·that·message·fragmentation·does223 require·fragmentation/reassembling).·Notice·that·message·fragmentation·does
224 not·affect·the·logical·atomicity·of·its·delivery;·this·option·is·provided·for224 not·affect·the·logical·atomicity·of·its·delivery;·this·option·is·provided·for
225 performance·reasons·only.</p></li><li><p><strong><code·class="inline">{sctp_i_want_mapped_v4_addr, true|false}</code></strong>·-·Turns·on|off·automatic225 performance·reasons·only.</p></li><li><p><strong><code·class="inline">{sctp_i_want_mapped_v4_addr, true|false}</code></strong>·-·Turns·on|off·automatic
226 mapping·of·IPv4·addresses·into·IPv6·ones·(if·the·socket·address·family·is226 mapping·of·IPv4·addresses·into·IPv6·ones·(if·the·socket·address·family·is
227 <code·class="inline">AF_INET6</code>).</p></li><li><p><strong><code·class="inline">{sctp_maxseg, integer()}</code></strong>·-·Determines·the·maximum·chunk·size·if·message227 <code·class="inline">AF_INET6</code>).</p></li><li><p><strong><code·class="inline">{sctp_maxseg, integer()}</code></strong>·-·Determines·the·maximum·chunk·size·if·message
228 fragmentation·is·used.·If·<code·class="inline">0</code>,·the·chunk·size·is·limited·by·the·Path·MTU·only.</p></li><li><p><strong><code·class="inline">{sctp_primary_addr, #sctp_prim{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_prim</span><span·class="p"·data-group-id="2692409063-1">{</span><span·class="w">228 fragmentation·is·used.·If·<code·class="inline">0</code>,·the·chunk·size·is·limited·by·the·Path·MTU·only.</p></li><li><p><strong><code·class="inline">{sctp_primary_addr, #sctp_prim{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_prim</span><span·class="p"·data-group-id="2464415044-1">{</span><span·class="w">
229 ······</span><span·class="ss">assoc_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="2692409063-2">(</span><span·class="p"·data-group-id="2692409063-2">)</span><span·class="p">,</span><span·class="w">229 ······</span><span·class="ss">assoc_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="2464415044-2">(</span><span·class="p"·data-group-id="2464415044-2">)</span><span·class="p">,</span><span·class="w">
230 ······</span><span·class="ss">addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2692409063-3">{</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="2692409063-3">}</span><span·class="w">230 ······</span><span·class="ss">addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2464415044-3">{</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="2464415044-3">}</span><span·class="w">
231 </span><span·class="p"·data-group-id="2692409063-1">}</span><span·class="w">231 </span><span·class="p"·data-group-id="2464415044-1">}</span><span·class="w">
232 ·</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="2692409063-4">(</span><span·class="p"·data-group-id="2692409063-4">)</span><span·class="w">232 ·</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="2464415044-4">(</span><span·class="p"·data-group-id="2464415044-4">)</span><span·class="w">
233 ·</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">port_number</span><span·class="p"·data-group-id="2692409063-5">(</span><span·class="p"·data-group-id="2692409063-5">)</span></code></pre><p>For·the·association·specified·by·<code·class="inline">assoc_id</code>,·<code·class="inline">{IP,Port}</code>·must·be·one·of·the233 ·</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">port_number</span><span·class="p"·data-group-id="2464415044-5">(</span><span·class="p"·data-group-id="2464415044-5">)</span></code></pre><p>For·the·association·specified·by·<code·class="inline">assoc_id</code>,·<code·class="inline">{IP,Port}</code>·must·be·one·of·the
234 peer·addresses.·This·option·determines·that·the·specified·address·is·treated234 peer·addresses.·This·option·determines·that·the·specified·address·is·treated
235 by·the·local·SCTP·stack·as·the·primary·address·of·the·peer.</p></li><li><p><strong><code·class="inline">{sctp_set_peer_primary_addr, #sctp_setpeerprim{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_setpeerprim</span><span·class="p"·data-group-id="5100503839-1">{</span><span·class="w">235 by·the·local·SCTP·stack·as·the·primary·address·of·the·peer.</p></li><li><p><strong><code·class="inline">{sctp_set_peer_primary_addr, #sctp_setpeerprim{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_setpeerprim</span><span·class="p"·data-group-id="8282073071-1">{</span><span·class="w">
236 ······</span><span·class="ss">assoc_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="5100503839-2">(</span><span·class="p"·data-group-id="5100503839-2">)</span><span·class="p">,</span><span·class="w">236 ······</span><span·class="ss">assoc_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="8282073071-2">(</span><span·class="p"·data-group-id="8282073071-2">)</span><span·class="p">,</span><span·class="w">
237 ······</span><span·class="ss">addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5100503839-3">{</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="5100503839-3">}</span><span·class="w">237 ······</span><span·class="ss">addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8282073071-3">{</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="8282073071-3">}</span><span·class="w">
238 </span><span·class="p"·data-group-id="5100503839-1">}</span><span·class="w">238 </span><span·class="p"·data-group-id="8282073071-1">}</span><span·class="w">
239 ·</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="5100503839-4">(</span><span·class="p"·data-group-id="5100503839-4">)</span><span·class="w">239 ·</span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="8282073071-4">(</span><span·class="p"·data-group-id="8282073071-4">)</span><span·class="w">
240 ·</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">port_number</span><span·class="p"·data-group-id="5100503839-5">(</span><span·class="p"·data-group-id="5100503839-5">)</span></code></pre><p>When·set,·informs·the·peer·to·use·<code·class="inline">{IP, Port}</code>·as·the·primary·address·of·the240 ·</span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">port_number</span><span·class="p"·data-group-id="8282073071-5">(</span><span·class="p"·data-group-id="8282073071-5">)</span></code></pre><p>When·set,·informs·the·peer·to·use·<code·class="inline">{IP, Port}</code>·as·the·primary·address·of·the
241 local·endpoint·for·the·association·specified·by·<code·class="inline">assoc_id</code>.</p></li><li><p><strong><code·class="inline">{sctp_adaptation_layer, #sctp_setadaptation{}}</code></strong>·<a·href=""·id="option-sctp_adaptation_layer"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_setadaptation</span><span·class="p"·data-group-id="9192490412-1">{</span><span·class="w">241 local·endpoint·for·the·association·specified·by·<code·class="inline">assoc_id</code>.</p></li><li><p><strong><code·class="inline">{sctp_adaptation_layer, #sctp_setadaptation{}}</code></strong>·<a·href=""·id="option-sctp_adaptation_layer"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_setadaptation</span><span·class="p"·data-group-id="0526915812-1">{</span><span·class="w">
242 ······</span><span·class="ss">adaptation_ind</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9192490412-2">(</span><span·class="p"·data-group-id="9192490412-2">)</span><span·class="w">242 ······</span><span·class="ss">adaptation_ind</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0526915812-2">(</span><span·class="p"·data-group-id="0526915812-2">)</span><span·class="w">
243 </span><span·class="p"·data-group-id="9192490412-1">}</span></code></pre><p>When·set,·requests·that·the·local·endpoint·uses·the·value·specified·by243 </span><span·class="p"·data-group-id="0526915812-1">}</span></code></pre><p>When·set,·requests·that·the·local·endpoint·uses·the·value·specified·by
244 <code·class="inline">adaptation_ind</code>·as·the·Adaptation·Indication·parameter·for·establishing244 <code·class="inline">adaptation_ind</code>·as·the·Adaptation·Indication·parameter·for·establishing
245 new·associations.·For·details,·see245 new·associations.·For·details,·see
246 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">RFC·2960</a>·and246 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">RFC·2960</a>·and
247 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>.</p></li><li><p><strong><code·class="inline">{sctp_peer_addr_params, #sctp_paddrparams{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_paddrparams</span><span·class="p"·data-group-id="0248682964-1">{</span><span·class="w">247 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>.</p></li><li><p><strong><code·class="inline">{sctp_peer_addr_params, #sctp_paddrparams{}}</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_paddrparams</span><span·class="p"·data-group-id="6075970835-1">{</span><span·class="w">
248 ······</span><span·class="ss">assoc_id</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="0248682964-2">(</span><span·class="p"·data-group-id="0248682964-2">)</span><span·class="p">,</span><span·class="w">248 ······</span><span·class="ss">assoc_id</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="6075970835-2">(</span><span·class="p"·data-group-id="6075970835-2">)</span><span·class="p">,</span><span·class="w">
249 ······</span><span·class="ss">address</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0248682964-3">{</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="0248682964-3">}</span><span·class="p">,</span><span·class="w">249 ······</span><span·class="ss">address</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6075970835-3">{</span><span·class="n">IP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="6075970835-3">}</span><span·class="p">,</span><span·class="w">
250 ······</span><span·class="ss">hbinterval</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0248682964-4">(</span><span·class="p"·data-group-id="0248682964-4">)</span><span·class="p">,</span><span·class="w">250 ······</span><span·class="ss">hbinterval</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6075970835-4">(</span><span·class="p"·data-group-id="6075970835-4">)</span><span·class="p">,</span><span·class="w">
251 ······</span><span·class="ss">pathmaxrxt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0248682964-5">(</span><span·class="p"·data-group-id="0248682964-5">)</span><span·class="p">,</span><span·class="w">251 ······</span><span·class="ss">pathmaxrxt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6075970835-5">(</span><span·class="p"·data-group-id="6075970835-5">)</span><span·class="p">,</span><span·class="w">
252 ······</span><span·class="ss">pathmtu</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0248682964-6">(</span><span·class="p"·data-group-id="0248682964-6">)</span><span·class="p">,</span><span·class="w">252 ······</span><span·class="ss">pathmtu</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6075970835-6">(</span><span·class="p"·data-group-id="6075970835-6">)</span><span·class="p">,</span><span·class="w">
253 ······</span><span·class="ss">sackdelay</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="0248682964-7">(</span><span·class="p"·data-group-id="0248682964-7">)</span><span·class="p">,</span><span·class="w">253 ······</span><span·class="ss">sackdelay</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6075970835-7">(</span><span·class="p"·data-group-id="6075970835-7">)</span><span·class="p">,</span><span·class="w">
254 ······</span><span·class="ss">flags</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">list</span><span·class="p"·data-group-id="0248682964-8">(</span><span·class="p"·data-group-id="0248682964-8">)</span><span·class="w">254 ······</span><span·class="ss">flags</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">list</span><span·class="p"·data-group-id="6075970835-8">(</span><span·class="p"·data-group-id="6075970835-8">)</span><span·class="w">
255 </span><span·class="p"·data-group-id="0248682964-1">}</span><span·class="w">255 </span><span·class="p"·data-group-id="6075970835-1">}</span><span·class="w">
256 </span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="0248682964-9">(</span><span·class="p"·data-group-id="0248682964-9">)</span><span·class="w">256 </span><span·class="n">IP</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="6075970835-9">(</span><span·class="p"·data-group-id="6075970835-9">)</span><span·class="w">
257 </span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">port_number</span><span·class="p"·data-group-id="0248682964-10">(</span><span·class="p"·data-group-id="0248682964-10">)</span></code></pre><p>Determines·various·per-address·parameters·for·the·association·specified·by257 </span><span·class="n">Port</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">port_number</span><span·class="p"·data-group-id="6075970835-10">(</span><span·class="p"·data-group-id="6075970835-10">)</span></code></pre><p>Determines·various·per-address·parameters·for·the·association·specified·by
258 <code·class="inline">assoc_id</code>·and·the·peer·address·<code·class="inline">address</code>·(the·SCTP·protocol·supports258 <code·class="inline">assoc_id</code>·and·the·peer·address·<code·class="inline">address</code>·(the·SCTP·protocol·supports
259 multi-homing,·so·more·than·one·address·can·correspond·to·a·specified259 multi-homing,·so·more·than·one·address·can·correspond·to·a·specified
260 association).</p><ul><li><p><strong><code·class="inline">hbinterval</code></strong>·-·Heartbeat·interval,·in·milliseconds</p></li><li><p><strong><code·class="inline">pathmaxrxt</code></strong>·-·Maximum·number·of·retransmissions·before·this·address·is260 association).</p><ul><li><p><strong><code·class="inline">hbinterval</code></strong>·-·Heartbeat·interval,·in·milliseconds</p></li><li><p><strong><code·class="inline">pathmaxrxt</code></strong>·-·Maximum·number·of·retransmissions·before·this·address·is
261 considered·unreachable·(and·an·alternative·address·is·selected)</p></li><li><p><strong><code·class="inline">pathmtu</code></strong>·-·Fixed·Path·MTU,·if·automatic·discovery·is·disabled·(see261 considered·unreachable·(and·an·alternative·address·is·selected)</p></li><li><p><strong><code·class="inline">pathmtu</code></strong>·-·Fixed·Path·MTU,·if·automatic·discovery·is·disabled·(see
262 <code·class="inline">flags</code>·below)</p></li><li><p><strong><code·class="inline">sackdelay</code></strong>·-·Delay,·in·milliseconds,·for·SAC·messages·(if·the·delay·is262 <code·class="inline">flags</code>·below)</p></li><li><p><strong><code·class="inline">sackdelay</code></strong>·-·Delay,·in·milliseconds,·for·SAC·messages·(if·the·delay·is
263 enabled,·see·<code·class="inline">flags</code>·below)</p></li><li><p><strong><code·class="inline">flags</code></strong>·-·The·following·flags·are·available:</p><ul><li><p><strong><code·class="inline">hb_enable</code></strong>·-·Enables·heartbeat</p></li><li><p><strong><code·class="inline">hb_disable</code></strong>·-·Disables·heartbeat</p></li><li><p><strong><code·class="inline">hb_demand</code></strong>·-·Initiates·heartbeat·immediately</p></li><li><p><strong><code·class="inline">pmtud_enable</code></strong>·-·Enables·automatic·Path·MTU·discovery</p></li><li><p><strong><code·class="inline">pmtud_disable</code></strong>·-·Disables·automatic·Path·MTU·discovery</p></li><li><p><strong><code·class="inline">sackdelay_enable</code></strong>·-·Enables·SAC·delay</p></li><li><p><strong><code·class="inline">sackdelay_disable</code></strong>·-·Disables·SAC·delay</p></li></ul></li></ul></li><li><p><strong><code·class="inline">{sctp_default_send_param, #sctp_sndrcvinfo{}}</code></strong></p><p><a·href=""·id="record-sctp_sndrcvinfo"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_sndrcvinfo</span><span·class="p"·data-group-id="5478513608-1">{</span><span·class="w">263 enabled,·see·<code·class="inline">flags</code>·below)</p></li><li><p><strong><code·class="inline">flags</code></strong>·-·The·following·flags·are·available:</p><ul><li><p><strong><code·class="inline">hb_enable</code></strong>·-·Enables·heartbeat</p></li><li><p><strong><code·class="inline">hb_disable</code></strong>·-·Disables·heartbeat</p></li><li><p><strong><code·class="inline">hb_demand</code></strong>·-·Initiates·heartbeat·immediately</p></li><li><p><strong><code·class="inline">pmtud_enable</code></strong>·-·Enables·automatic·Path·MTU·discovery</p></li><li><p><strong><code·class="inline">pmtud_disable</code></strong>·-·Disables·automatic·Path·MTU·discovery</p></li><li><p><strong><code·class="inline">sackdelay_enable</code></strong>·-·Enables·SAC·delay</p></li><li><p><strong><code·class="inline">sackdelay_disable</code></strong>·-·Disables·SAC·delay</p></li></ul></li></ul></li><li><p><strong><code·class="inline">{sctp_default_send_param, #sctp_sndrcvinfo{}}</code></strong></p><p><a·href=""·id="record-sctp_sndrcvinfo"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_sndrcvinfo</span><span·class="p"·data-group-id="7442871272-1">{</span><span·class="w">
264 ······</span><span·class="ss">stream</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-2">(</span><span·class="p"·data-group-id="5478513608-2">)</span><span·class="p">,</span><span·class="w">264 ······</span><span·class="ss">stream</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-2">(</span><span·class="p"·data-group-id="7442871272-2">)</span><span·class="p">,</span><span·class="w">
265 ······</span><span·class="ss">ssn</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-3">(</span><span·class="p"·data-group-id="5478513608-3">)</span><span·class="p">,</span><span·class="w">265 ······</span><span·class="ss">ssn</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-3">(</span><span·class="p"·data-group-id="7442871272-3">)</span><span·class="p">,</span><span·class="w">
266 ······</span><span·class="ss">flags</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">list</span><span·class="p"·data-group-id="5478513608-4">(</span><span·class="p"·data-group-id="5478513608-4">)</span><span·class="p">,</span><span·class="w">266 ······</span><span·class="ss">flags</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">list</span><span·class="p"·data-group-id="7442871272-4">(</span><span·class="p"·data-group-id="7442871272-4">)</span><span·class="p">,</span><span·class="w">
267 ······</span><span·class="ss">ppid</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-5">(</span><span·class="p"·data-group-id="5478513608-5">)</span><span·class="p">,</span><span·class="w">267 ······</span><span·class="ss">ppid</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-5">(</span><span·class="p"·data-group-id="7442871272-5">)</span><span·class="p">,</span><span·class="w">
268 ······</span><span·class="ss">context</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-6">(</span><span·class="p"·data-group-id="5478513608-6">)</span><span·class="p">,</span><span·class="w">268 ······</span><span·class="ss">context</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-6">(</span><span·class="p"·data-group-id="7442871272-6">)</span><span·class="p">,</span><span·class="w">
269 ······</span><span·class="ss">timetolive</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-7">(</span><span·class="p"·data-group-id="5478513608-7">)</span><span·class="p">,</span><span·class="w">269 ······</span><span·class="ss">timetolive</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-7">(</span><span·class="p"·data-group-id="7442871272-7">)</span><span·class="p">,</span><span·class="w">
270 ······</span><span·class="ss">tsn</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-8">(</span><span·class="p"·data-group-id="5478513608-8">)</span><span·class="p">,</span><span·class="w">270 ······</span><span·class="ss">tsn</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-8">(</span><span·class="p"·data-group-id="7442871272-8">)</span><span·class="p">,</span><span·class="w">
271 ······</span><span·class="ss">cumtsn</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="5478513608-9">(</span><span·class="p"·data-group-id="5478513608-9">)</span><span·class="p">,</span><span·class="w">271 ······</span><span·class="ss">cumtsn</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="7442871272-9">(</span><span·class="p"·data-group-id="7442871272-9">)</span><span·class="p">,</span><span·class="w">
272 ······</span><span·class="ss">assoc_id</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="5478513608-10">(</span><span·class="p"·data-group-id="5478513608-10">)</span><span·class="w">272 ······</span><span·class="ss">assoc_id</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">assoc_id</span><span·class="p"·data-group-id="7442871272-10">(</span><span·class="p"·data-group-id="7442871272-10">)</span><span·class="w">
273 </span><span·class="p"·data-group-id="5478513608-1">}</span></code></pre><p><code·class="inline">#sctp_sndrcvinfo{}</code>·is·used·both·in·this·socket·option,·and·as273 </span><span·class="p"·data-group-id="7442871272-1">}</span></code></pre><p><code·class="inline">#sctp_sndrcvinfo{}</code>·is·used·both·in·this·socket·option,·and·as
274 ancillary·data·while·sending·or·receiving·SCTP·messages.·When·set274 ancillary·data·while·sending·or·receiving·SCTP·messages.·When·set
275 as·an·option,·it·provides·default·values·for·subsequent275 as·an·option,·it·provides·default·values·for·subsequent
276 <a·href="#send/3"><code·class="inline">send</code></a>·calls·on·the·association·specified·by·<code·class="inline">assoc_id</code>.</p><p><code·class="inline">assoc_id = 0</code>·(default)·indicates·the·whole·endpoint.</p><p>The·following·fields·typically·must·be·specified·by·the·sender:</p><ul><li><p><strong><code·class="inline">sinfo_stream</code></strong>·-·Stream·number·(0-base)·within·the·association·to·send276 <a·href="#send/3"><code·class="inline">send</code></a>·calls·on·the·association·specified·by·<code·class="inline">assoc_id</code>.</p><p><code·class="inline">assoc_id = 0</code>·(default)·indicates·the·whole·endpoint.</p><p>The·following·fields·typically·must·be·specified·by·the·sender:</p><ul><li><p><strong><code·class="inline">sinfo_stream</code></strong>·-·Stream·number·(0-base)·within·the·association·to·send
277 the·messages·through;</p></li><li><p><strong><code·class="inline">sinfo_flags</code></strong>·-·The·following·flags·are·recognised:</p><ul><li><p><strong><code·class="inline">unordered</code></strong>·-·The·message·is·to·be·sent·unordered</p></li><li><p><strong><code·class="inline">addr_over</code></strong>·-·The·address·specified·in·<a·href="#send/3"><code·class="inline">send</code></a>·overwrites277 the·messages·through;</p></li><li><p><strong><code·class="inline">sinfo_flags</code></strong>·-·The·following·flags·are·recognised:</p><ul><li><p><strong><code·class="inline">unordered</code></strong>·-·The·message·is·to·be·sent·unordered</p></li><li><p><strong><code·class="inline">addr_over</code></strong>·-·The·address·specified·in·<a·href="#send/3"><code·class="inline">send</code></a>·overwrites
278 the·primary·peer·address</p></li><li><p><strong><code·class="inline">abort</code></strong>·-·Aborts·the·current·association·without·flushing·any·unsent278 the·primary·peer·address</p></li><li><p><strong><code·class="inline">abort</code></strong>·-·Aborts·the·current·association·without·flushing·any·unsent
279 data</p></li><li><p><strong><code·class="inline">eof</code></strong>·-·Gracefully·shuts·down·the·current·association,·with·flushing279 data</p></li><li><p><strong><code·class="inline">eof</code></strong>·-·Gracefully·shuts·down·the·current·association,·with·flushing
280 of·unsent·data</p></li></ul><p>Other·fields·are·rarely·used.·For·complete·information,·see280 of·unsent·data</p></li></ul><p>Other·fields·are·rarely·used.·For·complete·information,·see
281 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">RFC·2960</a>·and281 <a·href="http://www.rfc-archive.org/getrfc.php?rfc=2960">RFC·2960</a>·and
282 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>.</p></li></ul></li><li><p><strong><code·class="inline">{sctp_events, #sctp_event_subscribe{}}</code></strong>·<a·href=""·id="option-sctp_events"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_event_subscribe</span><span·class="p"·data-group-id="1979777601-1">{</span><span·class="w">282 <a·href="http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13">Sockets·API·Extensions·for·SCTP</a>.</p></li></ul></li><li><p><strong><code·class="inline">{sctp_events, #sctp_event_subscribe{}}</code></strong>·<a·href=""·id="option-sctp_events"></a></p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">sctp_event_subscribe</span><span·class="p"·data-group-id="4492770108-1">{</span><span·class="w">
283 ········</span><span·class="ss">data_io_event</span><span·class="w">··········</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">283 ········</span><span·class="ss">data_io_event</span><span·class="w">··········</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
284 ········</span><span·class="ss">association_event</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">284 ········</span><span·class="ss">association_event</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
285 ········</span><span·class="ss">address_event</span><span·class="w">··········</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">285 ········</span><span·class="ss">address_event</span><span·class="w">··········</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
286 ········</span><span·class="ss">send_failure_event</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">286 ········</span><span·class="ss">send_failure_event</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
287 ········</span><span·class="ss">peer_error_event</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">287 ········</span><span·class="ss">peer_error_event</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
288 ········</span><span·class="ss">shutdown_event</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">288 ········</span><span·class="ss">shutdown_event</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
289 ········</span><span·class="ss">partial_delivery_event</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">289 ········</span><span·class="ss">partial_delivery_event</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">
290 ········</span><span·class="ss">adaptation_layer_event</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">290 ········</span><span·class="ss">adaptation_layer_event</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">
291 </span><span·class="p"·data-group-id="1979777601-1">}</span></code></pre><p>This·option·determines·which·<a·href="#sctp-events">SCTP Events</a>·that·are·to·be291 </span><span·class="p"·data-group-id="4492770108-1">}</span></code></pre><p>This·option·determines·which·<a·href="#sctp-events">SCTP Events</a>·that·are·to·be
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126 ··</h1>126 ··</h1>
  
  
127 ····<section·id="moduledoc">127 ····<section·id="moduledoc">
128 <p>Interface·to·TCP/IP·sockets.</p><p>This·module·provides·functions·for·communicating·over·TCP/IP128 <p>Interface·to·TCP/IP·sockets.</p><p>This·module·provides·functions·for·communicating·over·TCP/IP
129 protocol·sockets.</p><p>The·following·code·fragment·is·a·simple·example·of·a·client·connecting·to·a129 protocol·sockets.</p><p>The·following·code·fragment·is·a·simple·example·of·a·client·connecting·to·a
130 server·at·port·5678,·transferring·a·binary,·and·closing·the·connection:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">client</span><span·class="p"·data-group-id="3308326837-1">(</span><span·class="p"·data-group-id="3308326837-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">130 server·at·port·5678,·transferring·a·binary,·and·closing·the·connection:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">client</span><span·class="p"·data-group-id="5689918714-1">(</span><span·class="p"·data-group-id="5689918714-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
131 ····</span><span·class="n">SomeHostInNet</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;localhost&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·to·make·it·runnable·on·one·machine</span><span·class="w">131 ····</span><span·class="n">SomeHostInNet</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;localhost&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·to·make·it·runnable·on·one·machine</span><span·class="w">
132 ····</span><span·class="p"·data-group-id="3308326837-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="3308326837-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·119,·SHA:·564793de76b531131d2f567f90b86db94021899a84d63ba55571bedd21608246·...·]-3">(</span><span·class="n">SomeHostInNet</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5678</span><span·class="p">,</span><span·class="w">132 ····</span><span·class="p"·data-group-id="5689918714-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="5689918714-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·119,·SHA:·f030999bc96b4ceb7585bdc9226e4d629c65a3620356224188e89bba59f9b73d·...·]-3">(</span><span·class="n">SomeHostInNet</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5678</span><span·class="p">,</span><span·class="w">
133 ·································</span><span·class="p"·data-group-id="3308326837-4">[</span><span·class="ss">binary</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3308326837-5">{</span><span·class="ss">packet</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span>[·...·truncated·by·diffoscope;·len:·147,·SHA:·59efec67277985e47e14cfc269ad31c06669e5fb5db5a672122b34004e502c2a·...·]-3">)</span><span·class="p">,</span><span·class="w">133 ·································</span><span·class="p"·data-group-id="5689918714-4">[</span><span·class="ss">binary</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5689918714-5">{</span><span·class="ss">packet</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span>[·...·truncated·by·diffoscope;·len:·147,·SHA:·6561b13117c297fd216d02942f05f91b56dbb727683e8e839c2edc758853abfc·...·]-3">)</span><span·class="p">,</span><span·class="w">
134 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="3308326837-6">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Some·Data&quot;</span><span·class="p"·data-group-id="3308326837-6">)</span><span·class="p">,</span><span·class="w">134 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="5689918714-6">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Some·Data&quot;</span><span·class="p"·data-group-id="5689918714-6">)</span><span·class="p">,</span><span·class="w">
135 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3308326837-7">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="3308326837-7">)</span><span·class="p">.</span></code></pre><p>At·the·other·end,·a·server·is·listening·on·port·5678,·accepts·the·connection,135 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5689918714-7">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="5689918714-7">)</span><span·class="p">.</span></code></pre><p>At·the·other·end,·a·server·is·listening·on·port·5678,·accepts·the·connection,
136 and·receives·the·binary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">server</span><span·class="p"·data-group-id="5539392148-1">(</span><span·class="p"·data-group-id="5539392148-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">136 and·receives·the·binary:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">server</span><span·class="p"·data-group-id="8153074724-1">(</span><span·class="p"·data-group-id="8153074724-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
137 ····</span><span·class="p"·data-group-id="5539392148-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LSock</span><span·class="p"·data-group-id="5539392148-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·535,·SHA:·db6a84b99d1e2160a0cf41084993b1eebae1c3b10db99dc321b3cd5b044f4323·...·]-5">}</span><span·class="p">,</span><span·class="w">137 ····</span><span·class="p"·data-group-id="8153074724-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LSock</span><span·class="p"·data-group-id="8153074724-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·535,·SHA:·8eefc005e8ac75f5fdf4cf435a2435687aec68aa50d5264066087c7eed19730c·...·]-5">}</span><span·class="p">,</span><span·class="w">
138 ········································</span><span·class="p"·data-group-id="5539392148-6">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="5539392148-6">}</span><span·class="p"·data-group-id="5539392148-4">]</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·63379da437f5d3d3c4945a47f3d34f6b1aee9269d223e04aa46f81dc0cd4fa28·...·]-3">)</span><span·class="p">,</span><span·class="w">138 ········································</span><span·class="p"·data-group-id="8153074724-6">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="8153074724-6">}</span><span·class="p"·data-group-id="8153074724-4">]</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·ba92ec0dff3a67322d9344ae2ca1b8909f186148c71b01d3cbb95c5126a8a822·...·]-3">)</span><span·class="p">,</span><span·class="w">
139 ····</span><span·class="p"·data-group-id="5539392148-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="5539392148-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·199,·SHA:·a3461ff3c4a7311d69422f5c4b9e0725c1e8f656dadafe37df41a2b8d9eeb480·...·]-8">)</span><span·class="p">,</span><span·class="w">139 ····</span><span·class="p"·data-group-id="8153074724-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="8153074724-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·199,·SHA:·e750b53b26db8c687f2389c340d5edd91cff4da86265c31becf1523ce2d2535d·...·]-8">)</span><span·class="p">,</span><span·class="w">
140 ····</span><span·class="p"·data-group-id="5539392148-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="5539392148-9">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·300,·SHA:·e1f8c35867c4d1aaa1479aca415f23085b9adfcfc2dc4fa87fcabe6efa84d725·...·]-10">)</span><span·class="p">,</span><span·class="w">140 ····</span><span·class="p"·data-group-id="8153074724-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="8153074724-9">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·300,·SHA:·5ffffeda4912ff315f138d9496396066e46d07d79f6cf89bf62d7728b198dbb8·...·]-10">)</span><span·class="p">,</span><span·class="w">
141 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5539392148-12">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="5539392148-12">)</span><span·class="p">,</span><span·class="w">141 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="8153074724-12">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="8153074724-12">)</span><span·class="p">,</span><span·class="w">
142 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5539392148-13">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="5539392148-13">)</span><span·class="p">,</span><span·class="w">142 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="8153074724-13">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="8153074724-13">)</span><span·class="p">,</span><span·class="w">
143 ····</span><span·class="n">Bin</span><span·class="p">.</span><span·class="w">143 ····</span><span·class="n">Bin</span><span·class="p">.</span><span·class="w">
  
144 </span><span·class="nf">do_recv</span><span·class="p"·data-group-id="5539392148-14">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bs</span><span·class="p"·data-group-id="5539392148-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">144 </span><span·class="nf">do_recv</span><span·class="p"·data-group-id="8153074724-14">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bs</span><span·class="p"·data-group-id="8153074724-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
145 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="5539392148-15">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="5539392148-15">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">145 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="8153074724-15">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="8153074724-15">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
146 ········</span><span·class="p"·data-group-id="5539392148-16">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="p"·data-group-id="5539392148-16">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">146 ········</span><span·class="p"·data-group-id="8153074724-16">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="p"·data-group-id="8153074724-16">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
147 ············</span><span·class="nf">do_recv</span><span·class="p"·data-group-id="5539392148-17">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5539392148-18">[</span><span·class="n">Bs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·c[·...·truncated·by·diffoscope;·len:·88,·SHA:·e0b4dcfdfe72a17f81abcc351be9e7a999f40b027c1258d3f7096ea02c5eafc4·...·]-17">)</span><span·class="p">;</span><span·class="w">147 ············</span><span·class="nf">do_recv</span><span·class="p"·data-group-id="8153074724-17">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8153074724-18">[</span><span·class="n">Bs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·c[·...·truncated·by·diffoscope;·len:·88,·SHA:·9c82bd1e3366501fd56213559d42465c1349c8100ddd30e5a69c00e21eab6d8f·...·]-17">)</span><span·class="p">;</span><span·class="w">
148 ········</span><span·class="p"·data-group-id="5539392148-19">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="5539392148-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
149 ············</span><span·class="p"·data-group-id="5539392148-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="5539392148-21">(</span><span·class="n">Bs</span>[·...·truncated·by·diffoscope;·len:·101,·SHA:·b1b1c9d662b69258849eea742a79b5edc098d23af43c0369e47cca3ef7d1c1ee·...·]</span><span·class="w">148 ········</span><span·class="p"·data-group-id="8153074724-19">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">closed</span><span·class="p"·data-group-id="8153074724-19">}</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·11,·SHA:·729ec6a90153422f6d3e5f23f801dfde120453a477458b8201046ba74dbb1028·...·]</span><span·class="w">
 149 ············</span><span·class="p"·data-group-id="8153074724-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="8153074724-21">(</span><span·class="n">Bs</span><span·class="p"·data-group-id="8153074724-21">)</span><span·class="p"·data-group-id="8153074724-20">}</span><span·class="w">
150 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>For·more·examples,·see·section·<a·href="#module-examples">Examples</a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Functions·that·create·sockets·can·take·an·optional·option;150 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>For·more·examples,·see·section·<a·href="#module-examples">Examples</a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Functions·that·create·sockets·can·take·an·optional·option;
151 <code·class="inline">{inet_backend, Backend}</code>·that,·if·specified,·has·to·be·the·first·option.·This151 <code·class="inline">{inet_backend, Backend}</code>·that,·if·specified,·has·to·be·the·first·option.·This
152 selects·the·implementation·backend·towards·the·platform's·socket·API.</p><p>This·is·a·<em>temporary</em>·option·that·will·be·ignored·in·a·future·release.</p><p>The·default·is·<code·class="inline">Backend = inet</code>·that·selects·the·traditional·<code·class="inline">inet_drv.c</code>152 selects·the·implementation·backend·towards·the·platform's·socket·API.</p><p>This·is·a·<em>temporary</em>·option·that·will·be·ignored·in·a·future·release.</p><p>The·default·is·<code·class="inline">Backend = inet</code>·that·selects·the·traditional·<code·class="inline">inet_drv.c</code>
153 driver.·The·other·choice·is·<code·class="inline">Backend = socket</code>·that·selects·the·new·<a·href="socket.html"><code·class="inline">socket</code></a>153 driver.·The·other·choice·is·<code·class="inline">Backend = socket</code>·that·selects·the·new·<a·href="socket.html"><code·class="inline">socket</code></a>
154 module·and·its·NIF·implementation.</p><p>The·system·default·can·be·changed·when·the·node·is·started·with·the154 module·and·its·NIF·implementation.</p><p>The·system·default·can·be·changed·when·the·node·is·started·with·the
155 application·<code·class="inline">kernel</code>'s·configuration·variable·<code·class="inline">inet_backend</code>.</p><p>For·<code·class="inline">gen_tcp</code>·with·<code·class="inline">inet_backend·=·socket</code>·we·have·tried·to·be·as·&quot;compatible&quot;155 application·<code·class="inline">kernel</code>'s·configuration·variable·<code·class="inline">inet_backend</code>.</p><p>For·<code·class="inline">gen_tcp</code>·with·<code·class="inline">inet_backend·=·socket</code>·we·have·tried·to·be·as·&quot;compatible&quot;
156 as·possible·which·has·sometimes·been·impossible.·Here·is·a·list·of·cases·when156 as·possible·which·has·sometimes·been·impossible.·Here·is·a·list·of·cases·when
Offset 185, 91 lines modifiedOffset 185, 91 lines modified
185 ··<span·class="text">Examples</span>185 ··<span·class="text">Examples</span>
186 </h2>186 </h2>
187 <p>The·following·example·illustrates·use·of·option·<code·class="inline">{active,once}</code>·and·multiple187 <p>The·following·example·illustrates·use·of·option·<code·class="inline">{active,once}</code>·and·multiple
188 accepts·by·implementing·a·server·as·a·number·of·worker·processes·doing·accept·on188 accepts·by·implementing·a·server·as·a·number·of·worker·processes·doing·accept·on
189 a·single·listening·socket.·Function·<code·class="inline">start/2</code>·takes·the·number·of·worker189 a·single·listening·socket.·Function·<code·class="inline">start/2</code>·takes·the·number·of·worker
190 processes·and·the·port·number·on·which·to·listen·for·incoming·connections.·If190 processes·and·the·port·number·on·which·to·listen·for·incoming·connections.·If
191 <code·class="inline">LPort</code>·is·specified·as·<code·class="inline">0</code>,·an·ephemeral·port·number·is·used,·which·is·why·the191 <code·class="inline">LPort</code>·is·specified·as·<code·class="inline">0</code>,·an·ephemeral·port·number·is·used,·which·is·why·the
192 start·function·returns·the·actual·port·number·allocated:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start</span><span·class="p"·data-group-id="5615038118-1">(</span><span·class="n">Num</span><span·class="p">,</span><span·class="n">LPort</span><span·class="p"·data-group-id="5615038118-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 start·function·returns·the·actual·port·number·allocated:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start</span><span·class="p"·data-group-id="8002488102-1">(</span><span·class="n">Num</span><span·class="p">,</span><span·class="n">LPort</span><span·class="p"·data-group-id="8002488102-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">listen</span><span·class="p"·data-group-id="5615038118-2">(</span><span·class="n">LPort</span><span·class="p">,</span><span·class="p"·data-group-id="5615038118-3">[</span><span·class="p"·data-group-id="5615038118-4">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·387,·SHA:·fa14f64e6287b16cfd7b4f7e88e00ce830fc0200ee3a0a14c1a1dd48456ddebd·...·]-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">193 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">listen</span><span·class="p"·data-group-id="8002488102-2">(</span><span·class="n">LPort</span><span·class="p">,</span><span·class="p"·data-group-id="8002488102-3">[</span><span·class="p"·data-group-id="8002488102-4">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·387,·SHA:·4466c3c71d2037edb1e4b414063e0a98c72e1770e757347b040baa25ceae96a7·...·]-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
194 ········</span><span·class="p"·data-group-id="5615038118-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ListenSock</span><span·class="p"·data-group-id="5615038118-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 ········</span><span·class="p"·data-group-id="8002488102-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ListenSock</span><span·class="p"·data-group-id="8002488102-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ············</span><span·class="nf">start_servers</span><span·class="p"·data-group-id="5615038118-7">(</span><span·class="n">Num</span><span·class="p">,</span><span·class="n">ListenSock</span><span·class="p"·data-group-id="5615038118-7">)</span><span·class="p">,</span><span·class="w">195 ············</span><span·class="nf">start_servers</span><span·class="p"·data-group-id="8002488102-7">(</span><span·class="n">Num</span><span·class="p">,</span><span·class="n">ListenSock</span><span·class="p"·data-group-id="8002488102-7">)</span><span·class="p">,</span><span·class="w">
196 ············</span><span·class="p"·data-group-id="5615038118-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="5615038118-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·199,·SHA:·15c57d6ead6727ca370b17376b366d0ca3a7dbc67b982501d68dad2eab9de268·...·]-9">)</span><span·class="p">,</span><span·class="w">196 ············</span><span·class="p"·data-group-id="8002488102-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="8002488102-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·199,·SHA:·09788e827a058b424d38e293a31931d9b7c1e75250a40754120bc1aa9747eeeb·...·]-9">)</span><span·class="p">,</span><span·class="w">
197 ············</span><span·class="n">Port</span><span·class="p">;</span><span·class="w">197 ············</span><span·class="n">Port</span><span·class="p">;</span><span·class="w">
198 ········</span><span·class="p"·data-group-id="5615038118-10">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="5615038118-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">198 ········</span><span·class="p"·data-group-id="8002488102-10">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="8002488102-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
199 ············</span><span·class="p"·data-group-id="5615038118-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="5615038118-11">}</span><span·class="w">199 ············</span><span·class="p"·data-group-id="8002488102-11">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Reason</span><span·class="p"·data-group-id="8002488102-11">}</span><span·class="w">
200 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">200 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
201 </span><span·class="nf">start_servers</span><span·class="p"·data-group-id="5615038118-12">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="5615038118-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">201 </span><span·class="nf">start_servers</span><span·class="p"·data-group-id="8002488102-12">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="8002488102-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
202 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">202 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
203 </span><span·class="nf">start_servers</span><span·class="p"·data-group-id="5615038118-13">(</span><span·class="n">Num</span><span·class="p">,</span><span·class="n">LS</span><span·class="p"·data-group-id="5615038118-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">203 </span><span·class="nf">start_servers</span><span·class="p"·data-group-id="8002488102-13">(</span><span·class="n">Num</span><span·class="p">,</span><span·class="n">LS</span><span·class="p"·data-group-id="8002488102-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
204 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="5615038118-14">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="ss">server</span><span·class="p">,</span><span·class="p"·data-group-id="5615038118-15">[</span><span·class="n">LS</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·72,·SHA:·14be4483a9bc7a161dc41cbd85dc0438b7390741134abf5fe4855dd5a0e30101·...·]-14">)</span><span·class="p">,</span><span·class="w">204 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="8002488102-14">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="ss">server</span><span·class="p">,</span><span·class="p"·data-group-id="8002488102-15">[</span><span·class="n">LS</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·72,·SHA:·e43656626762ebe5da50679f234a114617419be31dc6ed19921ac3ecea46e722·...·]-14">)</span><span·class="p">,</span><span·class="w">
205 ····</span><span·class="nf">start_servers</span><span·class="p"·data-group-id="5615038118-16">(</span><span·class="n">Num</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">LS</span><span·class="p"·data-group-id="5615038118-16">)</span><span·class="p">.</span><span·class="w">205 ····</span><span·class="nf">start_servers</span><span·class="p"·data-group-id="8002488102-16">(</span><span·class="n">Num</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">,</span><span·class="n">LS</span><span·class="p"·data-group-id="8002488102-16">)</span><span·class="p">.</span><span·class="w">
  
206 </span><span·class="nf">server</span><span·class="p"·data-group-id="5615038118-17">(</span><span·class="n">LS</span><span·class="p"·data-group-id="5615038118-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 </span><span·class="nf">server</span><span·class="p"·data-group-id="8002488102-17">(</span><span·class="n">LS</span><span·class="p"·data-group-id="8002488102-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">accept</span><span·class="p"·data-group-id="5615038118-18">(</span><span·class="n">LS</span><span·class="p"·data-group-id="5615038118-18">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">207 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">accept</span><span·class="p"·data-group-id="8002488102-18">(</span><span·class="n">LS</span><span·class="p"·data-group-id="8002488102-18">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
208 ········</span><span·class="p"·data-group-id="5615038118-19">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">S</span><span·class="p"·data-group-id="5615038118-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 ········</span><span·class="p"·data-group-id="8002488102-19">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">S</span><span·class="p"·data-group-id="8002488102-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="5615038118-20">(</span><span·class="n">S</span><span·class="p"·data-group-id="5615038118-20">)</span><span·class="p">,</span><span·class="w">209 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8002488102-20">(</span><span·class="n">S</span><span·class="p"·data-group-id="8002488102-20">)</span><span·class="p">,</span><span·class="w">
210 ············</span><span·class="nf">server</span><span·class="p"·data-group-id="5615038118-21">(</span><span·class="n">LS</span><span·class="p"·data-group-id="5615038118-21">)</span><span·class="p">;</span><span·class="w">210 ············</span><span·class="nf">server</span><span·class="p"·data-group-id="8002488102-21">(</span><span·class="n">LS</span><span·class="p"·data-group-id="8002488102-21">)</span><span·class="p">;</span><span·class="w">
211 ········</span><span·class="n">Other</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">211 ········</span><span·class="n">Other</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
212 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5615038118-22">(</span><span·class="s">&quot;accept·returned·</span><span·class="si">~w</span><span·class="s">·-·goodbye!</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="5615038118-23">[</[·...·truncated·by·diffoscope;·len:·128,·SHA:·af4049c692da32c13f67a164cb7ab993a8a3d163d63b3fe956e9643c18ae84da·...·]-22">)</span><span·class="p">,</span><span·class="w">212 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8002488102-22">(</span><span·class="s">&quot;accept·returned·</span><span·class="si">~w</span><span·class="s">·-·goodbye!</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8002488102-23">[</[·...·truncated·by·diffoscope;·len:·128,·SHA:·2b1a197b602774f68868eb852b458b59d50c61eeee75674078c8451659d54ca1·...·]-22">)</span><span·class="p">,</span><span·class="w">
213 ············</span><span·class="ss">ok</span><span·class="w">213 ············</span><span·class="ss">ok</span><span·class="w">
214 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">214 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
215 </span><span·class="nf">loop</span><span·class="p"·data-group-id="5615038118-24">(</span><span·class="n">S</span><span·class="p"·data-group-id="5615038118-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">215 </span><span·class="nf">loop</span><span·class="p"·data-group-id="8002488102-24">(</span><span·class="n">S</span><span·class="p"·data-group-id="8002488102-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
216 ····</span><span·class="nc">inet</span><span·class="p">:</span><span·class="nf">setopts</span><span·class="p"·data-group-id="5615038118-25">(</span><span·class="n">S</span><span·class="p">,</span><span·class="p"·data-group-id="5615038118-26">[</span><span·class="p"·data-group-id="5615038118-27">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="ss">once</[·...·truncated·by·diffoscope;·len:·154,·SHA:·85ad6fe8c51210b2336759ce6e813d3cb3d3e3ea8f0f736cdf92aa089bafd08e·...·]-25">)</span><span·class="p">,</span><span·class="w">216 ····</span><span·class="nc">inet</span><span·class="p">:</span><span·class="nf">setopts</span><span·class="p"·data-group-id="8002488102-25">(</span><span·class="n">S</span><span·class="p">,</span><span·class="p"·data-group-id="8002488102-26">[</span><span·class="p"·data-group-id="8002488102-27">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="ss">once</[·...·truncated·by·diffoscope;·len:·154,·SHA:·62a211470427b59b56427a933c2c74f4b7e6f7fbfde17c252cad5170578282fc·...·]-25">)</span><span·class="p">,</span><span·class="w">
217 ····</span><span·class="k">receive</span><span·class="w">217 ····</span><span·class="k">receive</span><span·class="w">
218 ········</span><span·class="p"·data-group-id="5615038118-28">{</span><span·class="ss">tcp</span><span·class="p">,</span><span·class="n">S</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="5615038118-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">218 ········</span><span·class="p"·data-group-id="8002488102-28">{</span><span·class="ss">tcp</span><span·class="p">,</span><span·class="n">S</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="8002488102-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
219 ············</span><span·class="n">Answer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">process</span><span·class="p"·data-group-id="5615038118-29">(</span><span·class="n">Data</span><span·class="p"·data-group-id="5615038118-29">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Not·implemented·in·this·example</span><span·class="w">219 ············</span><span·class="n">Answer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">process</span><span·class="p"·data-group-id="8002488102-29">(</span><span·class="n">Data</span><span·class="p"·data-group-id="8002488102-29">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Not·implemented·in·this·example</span><span·class="w">
220 ············</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="5615038118-30">(</span><span·class="n">S</span><span·class="p">,</span><span·class="n">Answer</span><span·class="p"·data-group-id="5615038118-30">)</span><span·class="p">,</span><span·class="w">220 ············</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="8002488102-30">(</span><span·class="n">S</span><span·class="p">,</span><span·class="n">Answer</span><span·class="p"·data-group-id="8002488102-30">)</span><span·class="p">,</span><span·class="w">
221 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="5615038118-31">(</span><span·class="n">S</span><span·class="p"·data-group-id="5615038118-31">)</span><span·class="p">;</span><span·class="w">221 ············</span><span·class="nf">loop</span><span·class="p"·data-group-id="8002488102-31">(</span><span·class="n">S</span><span·class="p"·data-group-id="8002488102-31">)</span><span·class="p">;</span><span·class="w">
222 ········</span><span·class="p"·data-group-id="5615038118-32">{</span><span·class="ss">tcp_closed</span><span·class="p">,</span><span·class="n">S</span><span·class="p"·data-group-id="5615038118-32">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 ········</span><span·class="p"·data-group-id="8002488102-32">{</span><span·class="ss">tcp_closed</span><span·class="p">,</span><span·class="n">S</span><span·class="p"·data-group-id="8002488102-32">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5615038118-33">(</span><span·class="s">&quot;Socket·</span><span·class="si">~w</span><span·class="s">·closed·[</span><span·class="si">~w</span><span·class="s">]</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·323,·SHA:·bcf818262181e7b7f2797e9339aa41c71d481dbeb4cec835fc57a1bc5868ac13·...·]-33">)</span><span·class="p">,</span><span·class="w">223 ············</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8002488102-33">(</span><span·class="s">&quot;Socket·</span><span·class="si">~w</span><span·class="s">·closed·[</span><span·class="si">~w</span><span·class="s">]</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·323,·SHA:·3a3c48632712587857480fb67fb3bca15570040613e58648e2db3d504c8e674c·...·]-33">)</span><span·class="p">,</span><span·class="w">
224 ············</span><span·class="ss">ok</span><span·class="w">224 ············</span><span·class="ss">ok</span><span·class="w">
225 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Example·of·a·simple·client:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">client</span><span·class="p"·data-group-id="5619243802-1">(</span><span·class="n">PortNo</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="5619243802-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">225 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Example·of·a·simple·client:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">client</span><span·class="p"·data-group-id="7614780531-1">(</span><span·class="n">PortNo</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="7614780531-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
226 ····</span><span·class="p"·data-group-id="5619243802-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Sock</span><span·class="p"·data-group-id="5619243802-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><[·...·truncated·by·diffoscope;·len:·458,·SHA:·b951eba27b87665bc0e2b276e4d7714872fc9e438d5527c3d9cba4c0c4993d53·...·]-5">}</span><span·class="p">,</span><span·class="w">226 ····</span><span·class="p"·data-group-id="7614780531-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Sock</span><span·class="p"·data-group-id="7614780531-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><[·...·truncated·by·diffoscope;·len:·458,·SHA:·e5493ea18c79643c088eabf87c5d66182ebc8876bc75a0f93f4ab610b520944c·...·]-5">}</span><span·class="p">,</span><span·class="w">
227 ····················································</span><span·class="p"·data-group-id="5619243802-6">{</span><span·class="ss">packet</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5619243802-6">}</span><span·class="p"·data-group-id="5619243802-4">]</span><span·class="p"·data-group-id="5619243802-3">)</span><span·class="p">,</span><span·class="w">227 ····················································</span><span·class="p"·data-group-id="7614780531-6">{</span><span·class="ss">packet</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="7614780531-6">}</span><span·class="p"·data-group-id="7614780531-4">]</span><span·class="p"·data-group-id="7614780531-3">)</span><span·class="p">,</span><span·class="w">
228 ····</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="5619243802-7">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="5619243802-7">)</span><span·class="p">,</span><span·class="w">228 ····</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="7614780531-7">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="7614780531-7">)</span><span·class="p">,</span><span·class="w">
229 ····</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="5619243802-8">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5619243802-8">)</span><span·class="p">,</span><span·class="w">229 ····</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="7614780531-8">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="7614780531-8">)</span><span·class="p">,</span><span·class="w">
230 ····</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5619243802-9">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="5619243802-9">)</span><span·class="p">,</span><span·class="w">230 ····</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="7614780531-9">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7614780531-9">)</span><span·class="p">,</span><span·class="w">
231 ····</span><span·class="n">A</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">send</code>·call·does·not·accept·a·time-out·option·because·time-outs·on·send·is231 ····</span><span·class="n">A</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">send</code>·call·does·not·accept·a·time-out·option·because·time-outs·on·send·is
232 handled·through·socket·option·<code·class="inline">send_timeout</code>.·The·behavior·of·a·send·operation232 handled·through·socket·option·<code·class="inline">send_timeout</code>.·The·behavior·of·a·send·operation
233 with·no·receiver·is·mainly·defined·by·the·underlying·TCP·stack·and·the·network233 with·no·receiver·is·mainly·defined·by·the·underlying·TCP·stack·and·the·network
234 infrastructure.·To·write·code·that·handles·a·hanging·receiver·that·can234 infrastructure.·To·write·code·that·handles·a·hanging·receiver·that·can
235 eventually·cause·the·sender·to·hang·on·a·<code·class="inline">send</code>·do·like·the·following.</p><p>Consider·a·process·that·receives·data·from·a·client·process·to·be·forwarded·to·a235 eventually·cause·the·sender·to·hang·on·a·<code·class="inline">send</code>·do·like·the·following.</p><p>Consider·a·process·that·receives·data·from·a·client·process·to·be·forwarded·to·a
236 server·on·the·network.·The·process·is·connected·to·the·server·through·TCP/IP·and236 server·on·the·network.·The·process·is·connected·to·the·server·through·TCP/IP·and
237 does·not·get·any·acknowledge·for·each·message·it·sends,·but·has·to·rely·on·the237 does·not·get·any·acknowledge·for·each·message·it·sends,·but·has·to·rely·on·the
238 send·time-out·option·to·detect·that·the·other·end·is·unresponsive.·Option238 send·time-out·option·to·detect·that·the·other·end·is·unresponsive.·Option
239 <code·class="inline">send_timeout</code>·can·be·used·when·connecting:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">239 <code·class="inline">send_timeout</code>·can·be·used·when·connecting:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
240 </span><span·class="p"·data-group-id="0613587779-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Sock</span><span·class="p"·data-group-id="0613587779-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><[·...·truncated·by·diffoscope;·len:·95,·SHA:·7def263b415b64016acb4ee5c9bd8cc248c93f0d100f1ee635d2e4cc7fb9afe1·...·]-2">(</span><span·class="n">HostAddress</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">240 </span><span·class="p"·data-group-id="2177884657-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Sock</span><span·class="p"·data-group-id="2177884657-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">gen_tcp</span><[·...·truncated·by·diffoscope;·len:·95,·SHA:·df9a4c0bdff1c35e7c46e58c2643bec89e464f46fca32284734f842886445199·...·]-2">(</span><span·class="n">HostAddress</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">
241 ····························</span><span·class="p"·data-group-id="0613587779-3">[</span><span·class="p"·data-group-id="0613587779-4">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="0613587779-4">}</span><span·class="p">,</span><span·class="w">241 ····························</span><span·class="p"·data-group-id="2177884657-3">[</span><span·class="p"·data-group-id="2177884657-4">{</span><span·class="ss">active</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="2177884657-4">}</span><span·class="p">,</span><span·class="w">
242 ·····························</span><span·class="p"·data-group-id="0613587779-5">{</span><span·class="ss">send_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p"·data-group-id="0613587779-5">}</span><span·class="p">,</span><span·class="w">242 ·····························</span><span·class="p"·data-group-id="2177884657-5">{</span><span·class="ss">send_timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p"·data-group-id="2177884657-5">}</span><span·class="p">,</span><span·class="w">
243 ·····························</span><span·class="p"·data-group-id="0613587779-6">{</span><span·class="ss">packet</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="0613587779-6">}</span><span·class="p"·data-group-id="0613587779-3">]</span><span·class="p"·data-group-id="0613587779-2">)</span><span·class="p">,</span><span·class="w">243 ·····························</span><span·class="p"·data-group-id="2177884657-6">{</span><span·class="ss">packet</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="2177884657-6">}</span><span·class="p"·data-group-id="2177884657-3">]</span><span·class="p"·data-group-id="2177884657-2">)</span><span·class="p">,</span><span·class="w">
244 ················</span><span·class="nf">loop</span><span·class="p"·data-group-id="0613587779-7">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="0613587779-7">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·See·below</span><span·class="w">244 ················</span><span·class="nf">loop</span><span·class="p"·data-group-id="2177884657-7">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="2177884657-7">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·See·below</span><span·class="w">
245 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>In·the·loop·where·requests·are·handled,·send·time-outs·can·now·be·detected:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="3474163981-1">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="3474163981-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">245 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>In·the·loop·where·requests·are·handled,·send·time-outs·can·now·be·detected:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">loop</span><span·class="p"·data-group-id="1190188832-1">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="1190188832-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
246 ····</span><span·class="k">receive</span><span·class="w">246 ····</span><span·class="k">receive</span><span·class="w">
247 ········</span><span·class="p"·data-group-id="3474163981-2">{</span><span·class="n">Client</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">send_data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Binary</span><span·class="p"·data-group-id="3474163981-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">247 ········</span><span·class="p"·data-group-id="1190188832-2">{</span><span·class="n">Client</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">send_data</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Binary</span><span·class="p"·data-group-id="1190188832-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
248 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="3474163981-3">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="p"·data-group-id="3474163981-4">[</span><span·class="n">Binary</span><span·class="p"·data-group-id="3474163981-4">]</span><span·class="p"·data-group-id="3474163981-3">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">248 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="1190188832-3">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="p"·data-group-id="1190188832-4">[</span><span·class="n">Binary</span><span·class="p"·data-group-id="1190188832-4">]</span><span·class="p"·data-group-id="1190188832-3">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
249 ················</span><span·class="p"·data-group-id="3474163981-5">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="p"·data-group-id="3474163981-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">249 ················</span><span·class="p"·data-group-id="1190188832-5">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="p"·data-group-id="1190188832-5">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
250 ····················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3474163981-6">(</span><span·class="s">&quot;Send·timeout,·closing!</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">250 ····················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1190188832-6">(</span><span·class="s">&quot;Send·timeout,·closing!</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
251 ······························</span><span·class="p"·data-group-id="3474163981-7">[</span><span·class="p"·data-group-id="3474163981-7">]</span><span·class="p"·data-group-id="3474163981-6">)</span><span·class="p">,</span><span·class="w">251 ······························</span><span·class="p"·data-group-id="1190188832-7">[</span><span·class="p"·data-group-id="1190188832-7">]</span><span·class="p"·data-group-id="1190188832-6">)</span><span·class="p">,</span><span·class="w">
252 ····················</span><span·class="nf">handle_send_timeout</span><span·class="p"·data-group-id="3474163981-8">(</span><span·class="p"·data-group-id="3474163981-8">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Not·implemented·here</span><span·class="w">252 ····················</span><span·class="nf">handle_send_timeout</span><span·class="p"·data-group-id="1190188832-8">(</span><span·class="p"·data-group-id="1190188832-8">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Not·implemented·here</span><span·class="w">
253 ····················</span><span·class="n">Client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3474163981-9">{</span><span·class="nf">self</span><span·class="p"·data-group-id="3474163981-10">(</span><span·class="p"·data-group-id="3474163981-10">)</span><span·class="p">,</span><span·class="p"·data-group-id="3474163981-11">{</span><span·class="ss">err[·...·truncated·by·diffoscope;·len:·191,·SHA:·03950d413a5228a2a83800b15692325ddbd1a7094a9a2fc46602ca45c9b96817·...·]-9">}</span><span·class="p">,</span><span·class="w">253 ····················</span><span·class="n">Client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1190188832-9">{</span><span·class="nf">self</span><span·class="p"·data-group-id="1190188832-10">(</span><span·class="p"·data-group-id="1190188832-10">)</span><span·class="p">,</span><span·class="p"·data-group-id="1190188832-11">{</span><span·class="ss">err[·...·truncated·by·diffoscope;·len:·191,·SHA:·e3394ec498532a7080dcde45e378f97412de2d71d0c1239f410852a8d89f8d16·...·]-9">}</span><span·class="p">,</span><span·class="w">
254 ····················</span><span·class="c1">%%·Usually,·it&#39;s·a·good·idea·to·give·up·in·case·of·a</span><span·class="w">254 ····················</span><span·class="c1">%%·Usually,·it&#39;s·a·good·idea·to·give·up·in·case·of·a</span><span·class="w">
255 ····················</span><span·class="c1">%%·send·timeout,·as·you·never·know·how·much·actually</span><span·class="w">255 ····················</span><span·class="c1">%%·send·timeout,·as·you·never·know·how·much·actually</span><span·class="w">
256 ····················</span><span·class="c1">%%·reached·the·server,·maybe·only·a·packet·header?!</span><span·class="w">256 ····················</span><span·class="c1">%%·reached·the·server,·maybe·only·a·packet·header?!</span><span·class="w">
257 ····················</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3474163981-12">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="3474163981-12">)</span><span·class="p">;</span><span·class="w">257 ····················</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1190188832-12">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="1190188832-12">)</span><span·class="p">;</span><span·class="w">
258 ················</span><span·class="p"·data-group-id="3474163981-13">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherSendError</span><span·class="p"·data-group-id="3474163981-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">258 ················</span><span·class="p"·data-group-id="1190188832-13">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherSendError</span><span·class="p"·data-group-id="1190188832-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
259 ····················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3474163981-14">(</span><span·class="s">&quot;Some·other·error·on·socket·(</span><span·class="si">~p</span><span·class="s">),·closing&quot;</span><span·class="p">,</span><span·class="w">259 ····················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1190188832-14">(</span><span·class="s">&quot;Some·other·error·on·socket·(</span><span·class="si">~p</span><span·class="s">),·closing&quot;</span><span·class="p">,</span><span·class="w">
260 ······························</span><span·class="p"·data-group-id="3474163981-15">[</span><span·class="n">OtherSendError</span><span·class="p"·data-group-id="3474163981-15">]</span><span·class="p"·data-group-id="3474163981-14">)</span><span·class="p">,</span><span·class="w"> 
261 ····················</span><span·class="n">Client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3474163981-16">{</span><span·class="nf">self</span><span·class="p"·data-group-id="3474163981-17">(</span><span·class=[·...·truncated·by·diffoscope;·len:·343,·SHA:·65f07ff58022185f0cd21f314223d954ac903d5e3f2454821c5ef9da2710edfa·...·]</span><span·class="p">,</span><span·class="w">260 ······························</span><span·class="p"·data-group-id="1190188832-15">[</span><span·class="n">OtherSendError</span><span·class="p"·data-group-id="1190188832-15">]</span><span·class="p"·data-group-id="1190188832-14">)</span><span·class="p">,</span><span·class="w">
 261 ····················</span><span·class="n">Client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1190188832-16">{</span><span·class="nf">self</span><span·class="p"·data-group-id="1190188832-17">(</span><span·class="p"·data-group-id="1190188832-17">)</span><span·class="p">,</span><span·class="p"·data-group-id="1190188832-18">{</span><span·class="ss">error_sending</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherSendError</span><span·class="p"·data-group-id="1190188832-18">}</span><span·class="p"·data-group-id="1190188832-16">}</span><span·class="p">,</span><span·class="w">
262 ····················</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="3474163981-19">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="3474163981-19">)</span><span·class="p">;</span><span·class="w">262 ····················</span><span·class="nc">gen_tcp</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1190188832-19">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="1190188832-19">)</span><span·class="p">;</span><span·class="w">
263 ················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">263 ················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
264 ····················</span><span·class="n">Client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="3474163981-20">{</span><span·class="nf">self</span><span·class="p"·data-group-id="3474163981-21">(</span><span·class="p"·data-group-id="3474163981-21">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">data_sent</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·32c91b326d06287fadfa7107d5bc70f53bd2702c87d4900d0ca69d8115d40c17·...·]-20">}</span><span·class="p">,</span><span·class="w">264 ····················</span><span·class="n">Client</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1190188832-20">{</span><span·class="nf">self</span><span·class="p"·data-group-id="1190188832-21">(</span><span·class="p"·data-group-id="1190188832-21">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">data_sent</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·19cb0cd482c9e60fa0a07fd113a0eb2afe2a0445fa80a0d94a7fde7d574eb80d·...·]-20">}</span><span·class="p">,</span><span·class="w">
265 ····················</span><span·class="nf">loop</span><span·class="p"·data-group-id="3474163981-22">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="3474163981-22">)</span><span·class="w">265 ····················</span><span·class="nf">loop</span><span·class="p"·data-group-id="1190188832-22">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="1190188832-22">)</span><span·class="w">
266 ············</span><span·class="k">end</span><span·class="w">266 ············</span><span·class="k">end</span><span·class="w">
267 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Usually·it·suffices·to·detect·time-outs·on·receive,·as·most·protocols·include267 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>Usually·it·suffices·to·detect·time-outs·on·receive,·as·most·protocols·include
268 some·sort·of·acknowledgment·from·the·server,·but·if·the·protocol·is·strictly·one268 some·sort·of·acknowledgment·from·the·server,·but·if·the·protocol·is·strictly·one
269 way,·option·<code·class="inline">send_timeout</code>·comes·in·handy.</p>269 way,·option·<code·class="inline">send_timeout</code>·comes·in·handy.</p>
270 ····</section>270 ····</section>
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924 time-to-live·(TTL)·for·outgoing·multicast·datagrams·to·control·the·scope·of924 time-to-live·(TTL)·for·outgoing·multicast·datagrams·to·control·the·scope·of
925 the·multicasts.</p><p>Datagrams·with·a·TTL·of·1·are·not·forwarded·beyond·the·local·network.925 the·multicasts.</p><p>Datagrams·with·a·TTL·of·1·are·not·forwarded·beyond·the·local·network.
926 Defaults·to·<code·class="inline">1</code>.</p></li><li><p><strong><code·class="inline">{add_membership, {MultiAddress, InterfaceAddress}}</code></strong>·-926 Defaults·to·<code·class="inline">1</code>.</p></li><li><p><strong><code·class="inline">{add_membership, {MultiAddress, InterfaceAddress}}</code></strong>·-
927 Joins·a·multicast·group.</p></li><li><p><strong><code·class="inline">{drop_membership, {MultiAddress, InterfaceAddress}}</code></strong>·-927 Joins·a·multicast·group.</p></li><li><p><strong><code·class="inline">{drop_membership, {MultiAddress, InterfaceAddress}}</code></strong>·-
928 Leaves·a·multicast·group.</p></li><li><p><strong><a·href="#t:option/0"><code·class="inline">option/0</code></a></strong>·-·See·<a·href="inet.html#setopts/2"><code·class="inline">inet:setopts/2</code></a>.</p></li></ul><p>UDP·packets·are·sent·with·this·socket·using·<a·href="#send/3"><code·class="inline">send(Socket, ...)</code></a>.928 Leaves·a·multicast·group.</p></li><li><p><strong><a·href="#t:option/0"><code·class="inline">option/0</code></a></strong>·-·See·<a·href="inet.html#setopts/2"><code·class="inline">inet:setopts/2</code></a>.</p></li></ul><p>UDP·packets·are·sent·with·this·socket·using·<a·href="#send/3"><code·class="inline">send(Socket, ...)</code></a>.
929 When·UDP·packets·arrive·to·the·<code·class="inline">Socket</code>'s·UDP·port,·and·the·socket·is·in929 When·UDP·packets·arrive·to·the·<code·class="inline">Socket</code>'s·UDP·port,·and·the·socket·is·in
930 an·<em>active·mode</em>,·the·packets·are·delivered·as·messages·to·the930 an·<em>active·mode</em>,·the·packets·are·delivered·as·messages·to·the
931 controlling·process·(socket·owner):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1008212434-1">{</span><span·class="ss">udp</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</span><span·class="p">,</span><span·class="err"> </span><span·class="n">PeerIP</span><span·class="p">,</span><span·class="err"> </span[·...·truncated·by·diffoscope;·len:·152,·SHA:·7ecc1217c5d8ff292b662beb26718b038c746b44fa05a6ab5f423899437ac183·...·]-1">}</span><span·class="w">·</span><span·class="c1">%·Without·ancillary·data</span><span·class="w">931 controlling·process·(socket·owner):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8834873889-1">{</span><span·class="ss">udp</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</span><span·class="p">,</span><span·class="err"> </span><span·class="n">PeerIP</span><span·class="p">,</span><span·class="err"> </span[·...·truncated·by·diffoscope;·len:·152,·SHA:·404e57a7bd6d5c480afb80a74762d776094b993a4e36cd412bdcc7451d2a4e1e·...·]-1">}</span><span·class="w">·</span><span·class="c1">%·Without·ancillary·data</span><span·class="w">
932 </span><span·class="p"·data-group-id="1008212434-2">{</span><span·class="ss">udp</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</span><span·class="p">,</span><span·class="err"> </span><span·class="n">PeerIP</span><span·class="p">,</span><span·class="err"> </span[·...·truncated·by·diffoscope;·len:·232,·SHA:·cdb174bd6751e6abc9adda65ce10613569ad3dd371569421edc90c7dbf234816·...·]-2">}</span><span·class="w">·</span><span·class="c1">%·With·ancillary·data</span></code></pre><p><code·class="inline">PeerIP</code>·and·<code·class="inline">PeerPort</code>·are·the·address·from·which·<code·class="inline">Packet</code>·was·sent.932 </span><span·class="p"·data-group-id="8834873889-2">{</span><span·class="ss">udp</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</span><span·class="p">,</span><span·class="err"> </span><span·class="n">PeerIP</span><span·class="p">,</span><span·class="err"> </span[·...·truncated·by·diffoscope;·len:·232,·SHA:·8c7b638718481bd3bf794b3fa805c7025debffda1d7105cb331cb9a4c3e1c187·...·]-2">}</span><span·class="w">·</span><span·class="c1">%·With·ancillary·data</span></code></pre><p><code·class="inline">PeerIP</code>·and·<code·class="inline">PeerPort</code>·are·the·address·from·which·<code·class="inline">Packet</code>·was·sent.
933 <code·class="inline">Packet</code>·is·a·list·of·bytes·(<code·class="inline">[</code><a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a><code·class="inline">]</code>·if·option·<code·class="inline">list</code>933 <code·class="inline">Packet</code>·is·a·list·of·bytes·(<code·class="inline">[</code><a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a><code·class="inline">]</code>·if·option·<code·class="inline">list</code>
934 is·active·and·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0"><code·class="inline">binary/0</code></a>·if·option·<code·class="inline">binary</code>is·active934 is·active·and·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0"><code·class="inline">binary/0</code></a>·if·option·<code·class="inline">binary</code>is·active
935 (they·are·mutually·exclusive).</p><p>The·message·contains·an·<code·class="inline">AncData</code>·field·only·if·any·of·the·socket935 (they·are·mutually·exclusive).</p><p>The·message·contains·an·<code·class="inline">AncData</code>·field·only·if·any·of·the·socket
936 <a·href="#t:option/0">options</a>·<a·href="inet.html#option-recvtos"><code·class="inline">recvtos</code></a>,936 <a·href="#t:option/0">options</a>·<a·href="inet.html#option-recvtos"><code·class="inline">recvtos</code></a>,
937 <a·href="inet.html#option-recvtclass"><code·class="inline">recvtclass</code></a>·or937 <a·href="inet.html#option-recvtclass"><code·class="inline">recvtclass</code></a>·or
938 <a·href="inet.html#option-recvttl"><code·class="inline">recvttl</code></a>·are·active.</p><p>When·a·socket·in·<code·class="inline">{active, N}</code>·mode·(see·<a·href="inet.html#setopts/2"><code·class="inline">inet:setopts/2</code></a>·for·details),938 <a·href="inet.html#option-recvttl"><code·class="inline">recvttl</code></a>·are·active.</p><p>When·a·socket·in·<code·class="inline">{active, N}</code>·mode·(see·<a·href="inet.html#setopts/2"><code·class="inline">inet:setopts/2</code></a>·for·details),
939 transitions·to·passive·(<code·class="inline">{active, false}</code>)·mode·(<code·class="inline">N</code>·counts·down·to·<code·class="inline">0</code>),939 transitions·to·passive·(<code·class="inline">{active, false}</code>)·mode·(<code·class="inline">N</code>·counts·down·to·<code·class="inline">0</code>),
940 the·controlling·process·is·notified·by·a·message·on·this·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2053958470-1">{</span><span·class="ss">udp_passive</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</span><span·class="p"·data-group-id="2053958470-1">}</span></code></pre><p>If·the·OS·protocol·stack·reports·an·error·for·the·socket,·the·following 
941 message·is·sent·to·the·controlling·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0922009101-1">{</span><span·class="ss">udp_error</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</s[·...·truncated·by·diffoscope;·len:·354,·SHA:·0f0d608500c79cb474bf7fdad99d32128f03a43296451b660219b2c21918dec1·...·]940 the·controlling·process·is·notified·by·a·message·on·this·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6564321885-1">{</span><span·class="ss">udp_passive</span><span·class="p">,</span><span·class="err"> </span><spa[·...·truncated·by·diffoscope;·len:·165,·SHA:·d40e7e324b05b791da8bc84ab3648caa02f7ab2f92443d9f327b23207704337d·...·]
 941 message·is·sent·to·the·controlling·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4830634465-1">{</span><span·class="ss">udp_error</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Socket</span><span·class="p">,</span><span·class="err"> </span><span·class="n">Reason</span><span·class="p"·data-group-id="4830634465-1">}</span></code></pre><p><code·class="inline">Reason</code>·is·mostly·a·<a·href="inet.html#posix-error-codes">POSIX·Error·Code</a>.</p><p>If·the·socket·is·in·<em>passive·mode</em>·(not·in·an·<em>active·mode</em>),·received·data
942 can·be·retrieved·with·the<code·class="inline">recv/2,3</code>](<a·href="#recv/2"><code·class="inline">recv/2</code></a>)·calls.·Note·that·incoming942 can·be·retrieved·with·the<code·class="inline">recv/2,3</code>](<a·href="#recv/2"><code·class="inline">recv/2</code></a>)·calls.·Note·that·incoming
943 UDP·packets·that·are·longer·than·the·receive·buffer·option·specifies943 UDP·packets·that·are·longer·than·the·receive·buffer·option·specifies
944 can·be·truncated·without·warning.</p><p>The·default·value·for·the·receive·buffer·option·is·<code·class="inline">{recbuf, 8192}</code>.</p>944 can·be·truncated·without·warning.</p><p>The·default·value·for·the·receive·buffer·option·is·<code·class="inline">{recbuf, 8192}</code>.</p>
945 ··</section>945 ··</section>
946 </section>946 </section>
947 <section·class="detail"·id="recv/2">947 <section·class="detail"·id="recv/2">
  
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1229 ······</p>1229 ······</p>
1230 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1230 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1231 ····</footer>1231 ····</footer>
1232 ··</div>1232 ··</div>
1233 </main>1233 </main>
1234 </div>1234 </div>
1235 <script>1235 <script>
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1247 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1247 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1248 ······</p>1248 ······</p>
1249 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1249 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1250 ····</footer>1250 ····</footer>
1251 ··</div>1251 ··</div>
1252 </main>1252 </main>
1253 </div>1253 </div>
1254 <script>1254 <script>
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128 ····<section·id="moduledoc">128 ····<section·id="moduledoc">
129 <p>Grouping·nodes·to·global·name·registration·groups.</p><p>This·module·makes·it·possible·to·partition·the·nodes·of·a·system·into·<em>global129 <p>Grouping·nodes·to·global·name·registration·groups.</p><p>This·module·makes·it·possible·to·partition·the·nodes·of·a·system·into·<em>global
130 groups</em>.·Each·global·group·has·its·own·global·namespace,·see·<a·href="global.html"><code·class="inline">global</code></a>.</p><p>The·main·advantage·of·dividing·systems·into·global·groups·is·that·the·background130 groups</em>.·Each·global·group·has·its·own·global·namespace,·see·<a·href="global.html"><code·class="inline">global</code></a>.</p><p>The·main·advantage·of·dividing·systems·into·global·groups·is·that·the·background
131 load·decreases·while·the·number·of·nodes·to·be·updated·is·reduced·when131 load·decreases·while·the·number·of·nodes·to·be·updated·is·reduced·when
132 manipulating·globally·registered·names.</p><p>The·Kernel·configuration·parameter·<a·href="kernel_app.html#global_groups"><code·class="inline">global_groups</code></a>132 manipulating·globally·registered·names.</p><p>The·Kernel·configuration·parameter·<a·href="kernel_app.html#global_groups"><code·class="inline">global_groups</code></a>
133 defines·the·global·groups:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8268894752-1">{</span><span·class="ss">global_groups</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8268894752-2">[</span><span·class="n">GroupTuple</span><span·class="w">·</span><span·class="p">:</span><span·class="p"[·...·truncated·by·diffoscope;·len:·267,·SHA:·9ab8f11d0e17124405833119df0c445e03cc0494b7358d6d20ed884ff6635019·...·]2-1">}</span></code></pre><p>For·the·processes·and·nodes·to·run·smoothly·using·the·global·group133 defines·the·global·groups:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3403580342-1">{</span><span·class="ss">global_groups</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3403580342-2">[</span><span·class="n">GroupTuple</span><span·class="w">·</span><span·class="p">:</span><span·class="p"[·...·truncated·by·diffoscope;·len:·267,·SHA:·a4c702cffa7824d1c60f8e34b533c044dac92c44541e54aded6093962bf39f09·...·]2-1">}</span></code></pre><p>For·the·processes·and·nodes·to·run·smoothly·using·the·global·group
134 functionality,·the·following·criteria·must·be·met:</p><ul><li>An·instance·of·the·global·group·server,·<code·class="inline">global_group</code>,·must·be·running·on134 functionality,·the·following·criteria·must·be·met:</p><ul><li>An·instance·of·the·global·group·server,·<code·class="inline">global_group</code>,·must·be·running·on
135 each·node.·The·processes·are·automatically·started·and·synchronized·when·a135 each·node.·The·processes·are·automatically·started·and·synchronized·when·a
136 node·is·started.</li><li>All·involved·nodes·must·agree·on·the·global·group·definition,·otherwise·the136 node·is·started.</li><li>All·involved·nodes·must·agree·on·the·global·group·definition,·otherwise·the
137 behavior·of·the·system·is·undefined.</li><li><em>All</em>·nodes·in·the·system·must·belong·to·exactly·one·global·group.</li></ul><p>In·the·following·descriptions,·a·<em>group·node</em>·is·a·node·belonging·to·the·same137 behavior·of·the·system·is·undefined.</li><li><em>All</em>·nodes·in·the·system·must·belong·to·exactly·one·global·group.</li></ul><p>In·the·following·descriptions,·a·<em>group·node</em>·is·a·node·belonging·to·the·same
138 global·group·as·the·local·node.</p><h2·id="module-notes"·class="section-heading">138 global·group·as·the·local·node.</p><h2·id="module-notes"·class="section-heading">
139 ··<a·href="#module-notes"·class="hover-link">139 ··<a·href="#module-notes"·class="hover-link">
140 ····<i·class="ri-link-m"·aria-hidden="true"></i>140 ····<i·class="ri-link-m"·aria-hidden="true"></i>
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906 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>906 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
907 ····</footer>907 ····</footer>
908 ··</div>908 ··</div>
909 </main>909 </main>
910 </div>910 </div>
911 <script>911 <script>
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593 ······</p>593 ······</p>
594 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>594 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
595 ····</footer>595 ····</footer>
596 ··</div>596 ··</div>
597 </main>597 </main>
598 </div>598 </div>
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147 inet_default_listen_options·'[{delay_send,true}]'</code></pre><p><strong>Please·note</strong>·that·the·default·option·<code·class="inline">{active,·true}</code>·cannot·be·changed,147 inet_default_listen_options·'[{delay_send,true}]'</code></pre><p><strong>Please·note</strong>·that·the·default·option·<code·class="inline">{active,·true}</code>·cannot·be·changed,
148 for·internal·implementation·reasons.</p><p>Addresses·as·inputs·to·functions·can·be·either·a·string·or·a·tuple.148 for·internal·implementation·reasons.</p><p>Addresses·as·inputs·to·functions·can·be·either·a·string·or·a·tuple.
149 For·example,·the·IP·address·150.236.20.73·can·be·passed·to149 For·example,·the·IP·address·150.236.20.73·can·be·passed·to
150 <a·href="#gethostbyaddr/1"><code·class="inline">gethostbyaddr/1</code></a>,·either·as·a·string·<code·class="inline">&quot;150.236.20.73&quot;</code>150 <a·href="#gethostbyaddr/1"><code·class="inline">gethostbyaddr/1</code></a>,·either·as·a·string·<code·class="inline">&quot;150.236.20.73&quot;</code>
151 or·as·a·tuple·<code·class="inline">{150, 236, 20, 73}</code>.</p><p><em>IPv4·address·examples:</em></p><pre><code·class="text">Address··········ip_address()151 or·as·a·tuple·<code·class="inline">{150, 236, 20, 73}</code>.</p><p><em>IPv4·address·examples:</em></p><pre><code·class="text">Address··········ip_address()
152 -------··········------------152 -------··········------------
153 127.0.0.1········{127,0,0,1}153 127.0.0.1········{127,0,0,1}
154 192.168.42.2·····{192,168,42,2}</code></pre><p><em>IPv6·address·examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Address</span><span·class="w">··········</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="9037614606-1">(</span><span·class="p"·data-group-id="9037614606-1">)</span><span·class="w">154 192.168.42.2·····{192,168,42,2}</code></pre><p><em>IPv6·address·examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Address</span><span·class="w">··········</span><span·class="nf">ip_address</span><span·class="p"·data-group-id="3388450705-1">(</span><span·class="p"·data-group-id="3388450705-1">)</span><span·class="w">
155 </span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">··········</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="w">155 </span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">-</span><span·class="w">··········</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="o">--</span><span·class="w">
156 </span><span·class="p">:</span><span·class="p">:</span><span·class="mi">1</span><span·class="w">·············</span><span·class="p"·data-group-id="9037614606-2">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·175,·SHA:·a14fc9d286dcabbc8bb62d8909185bcf96d3446f5ae4c7b2faa0602b0b4ff941·...·]-2">}</span><span·class="w">156 </span><span·class="p">:</span><span·class="p">:</span><span·class="mi">1</span><span·class="w">·············</span><span·class="p"·data-group-id="3388450705-2">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·175,·SHA:·a881538a02f2d6611a434aca84f39ddf85d3e3ed7cd99b5ea4099c315b167f91·...·]-2">}</span><span·class="w">
157 </span><span·class="p">:</span><span·class="p">:</span><span·class="mf">192.168</span><span·class="p">.</span><span·class="mf">42.2</span><span·class="w">··</span><span·class="p"·data-group-id="9037614606-3">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·792,·SHA:·6697a06a91de94bc4d4b4644971567f1009b2f45a5318e8a265c896b36734324·...·]-3">}</span><span·class="w">157 </span><span·class="p">:</span><span·class="p">:</span><span·class="mf">192.168</span><span·class="p">.</span><span·class="mf">42.2</span><span·class="w">··</span><span·class="p"·data-group-id="3388450705-3">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·792,·SHA:·b4b70ecc5ac4c89967f529ad01e24630575fce137ef518fc79689e2c6c023aaa·...·]-3">}</span><span·class="w">
158 </span><span·class="p">:</span><span·class="p">:</span><span·class="n">FFFF</span><span·class="p">:</span><span·class="mf">192.168</span><span·class="p">.</span><span·class="mf">42.2</span><span·class="w">158 </span><span·class="p">:</span><span·class="p">:</span><span·class="n">FFFF</span><span·class="p">:</span><span·class="mf">192.168</span><span·class="p">.</span><span·class="mf">42.2</span><span·class="w">
159 ················</span><span·class="p"·data-group-id="9037614606-6">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·798,·SHA:·5339077ccbc4c2afc0eab10ac0bca4a4a4bc35bd8b095ee2f9654ab29e3b9fc2·...·]-6">}</span><span·class="w">159 ················</span><span·class="p"·data-group-id="3388450705-6">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·798,·SHA:·2525dc6cf8c50e61ed2b01b61fa6dcc80f43bbbce069d5f26b5642399e2169a8·...·]-6">}</span><span·class="w">
160 </span><span·class="mi">3</span><span·class="nc">ffe</span><span·class="p">:</span><span·class="nc">b80</span><span·class="p">:</span><span·class="mi">1</span><span·class="nc">f8d</span><span·class="p">:</span><span·class="mi">2</span><span·class="p">:</span><span·class="mi">204</span><span·class="p">:</span><span·class="nc">acff</span><span·class="p">:</span><span·class="nc">fe17</span><span·class="p">:</span><span·class="ss">bf38</span><span·class="w">160 </span><span·class="mi">3</span><span·class="nc">ffe</span><span·class="p">:</span><span·class="nc">b80</span><span·class="p">:</span><span·class="mi">1</span><span·class="nc">f8d</span><span·class="p">:</span><span·class="mi">2</span><span·class="p">:</span><span·class="mi">204</span><span·class="p">:</span><span·class="nc">acff</span><span·class="p">:</span><span·class="nc">fe17</span><span·class="p">:</span><span·class="ss">bf38</span><span·class="w">
161 ················</span><span·class="p"·data-group-id="9037614606-9">{</span><span·class="mi">16#3ffe</span><span·class="p">,</span><span·class="mi">16#b80</span><span·class="p">,</span><span·class="mi">16#1f8d</span><span·class="p">,</span><span·class="mi">16#2</span><span·class="p">,</span><span·class="mi">1[·...·truncated·by·diffoscope;·len:·218,·SHA:·a472ff7e5eaedafa5951eb38afa4f0dd2831a906dd722dd18d9312c71ab175c0·...·]-9">}</span><span·class="w">161 ················</span><span·class="p"·data-group-id="3388450705-9">{</span><span·class="mi">16#3ffe</span><span·class="p">,</span><span·class="mi">16#b80</span><span·class="p">,</span><span·class="mi">16#1f8d</span><span·class="p">,</span><span·class="mi">16#2</span><span·class="p">,</span><span·class="mi">1[·...·truncated·by·diffoscope;·len:·218,·SHA:·2737f4bc5aa4b1d4fcb8287a7d5351d9d089cdcc8211f1448edb5bb8d1c5f82a·...·]-9">}</span><span·class="w">
162 </span><span·class="nc">fe80</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">204</span><span·class="p">:</span><span·class="nc">acff</span><span·class="p">:</span><span·class="nc">fe17</span><span·class="p">:</span><span·class="ss">bf38</span><span·class="w">162 </span><span·class="nc">fe80</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">204</span><span·class="p">:</span><span·class="nc">acff</span><span·class="p">:</span><span·class="nc">fe17</span><span·class="p">:</span><span·class="ss">bf38</span><span·class="w">
163 ················</span><span·class="p"·data-group-id="9037614606-10">{</span><span·class="mi">16#fe80</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">16#204</span><[·...·truncated·by·diffoscope;·len:·657,·SHA:·54a9687cf0eeb832f0a04caabb5df1a9774e48752093433bb668f99e4e45ea96·...·]-1">)</span><span·class="p">.</span><span·class="w">163 ················</span><span·class="p"·data-group-id="3388450705-10">{</span><span·class="mi">16#fe80</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">16#204</span><[·...·truncated·by·diffoscope;·len:·657,·SHA:·903aedbab02eb812e2b0b6a369b50b6a0a295e85aea95a4d35cba74892c1fc50·...·]-1">)</span><span·class="p">.</span><span·class="w">
164 </span><span·class="p"·data-group-id="6006594431-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6006594431-3">{</span><span·class="mi">192</span><span·class="p">,</span><span·class="mi">168</span><span·class="p">,</span><span·class="mi">42</span><spa[·...·truncated·by·diffoscope;·len:·139,·SHA:·649a29dc0417cd9f2e76aa3a472af0e71464e605c1c997399e26cde9a22dbaf5·...·]-2">}</span><span·class="gp·unselectable">164 </span><span·class="p"·data-group-id="6928944826-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6928944826-3">{</span><span·class="mi">192</span><span·class="p">,</span><span·class="mi">168</span><span·class="p">,</span><span·class="mi">42</span><spa[·...·truncated·by·diffoscope;·len:·139,·SHA:·0bea5c4d2027260fbf96c47863b0ebbbb4da915ba168393531aec1a78f607b8d·...·]-2">}</span><span·class="gp·unselectable">
165 2&gt;·</span><span·class="nc">inet</span><span·class="p">:</span><span·class="nf">parse_address</span><span·class="p"·data-group-id="6006594431-4">(</span><span·class="s">&quot;::FFFF:192.168.42.2&quot;</span><span·class="p"·data-group-id="6006594431-4">)</span><span·class="p">.</span><span·class="w">165 2&gt;·</span><span·class="nc">inet</span><span·class="p">:</span><span·class="nf">parse_address</span><span·class="p"·data-group-id="6928944826-4">(</span><span·class="s">&quot;::FFFF:192.168.42.2&quot;</span><span·class="p"·data-group-id="6928944826-4">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="p"·data-group-id="6006594431-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6006594431-6">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·cla[·...·truncated·by·diffoscope;·len:·342,·SHA:·e449b46c049a00d9a09a5fc3219e02af90f1e2a21b95a1ba32dd68d98798bde2·...·]-5">}</span></code></pre><h2·id="module-posix-error-codes"·class="section-heading">166 </span><span·class="p"·data-group-id="6928944826-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6928944826-6">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·cla[·...·truncated·by·diffoscope;·len:·342,·SHA:·032168bf4ae55a43ffae201c558460c22706dd4cbff4ae8c5e992b4a5a9d761b·...·]-5">}</span></code></pre><h2·id="module-posix-error-codes"·class="section-heading">
167 ··<a·href="#module-posix-error-codes"·class="hover-link">167 ··<a·href="#module-posix-error-codes"·class="hover-link">
168 ····<i·class="ri-link-m"·aria-hidden="true"></i>168 ····<i·class="ri-link-m"·aria-hidden="true"></i>
169 ··</a>169 ··</a>
170 ··<span·class="text"><a·href=""·id="posix-error-codes"></a>·POSIX·Error·Codes</span>170 ··<span·class="text"><a·href=""·id="posix-error-codes"></a>·POSIX·Error·Codes</span>
171 </h2>171 </h2>
172 <ul><li><code·class="inline">e2big</code>·-·Too·long·argument·list</li><li><code·class="inline">eacces</code>·-·Permission·denied</li><li><code·class="inline">eaddrinuse</code>·-·Address·already·in·use</li><li><code·class="inline">eaddrnotavail</code>·-·Cannot·assign·requested·address</li><li><code·class="inline">eadv</code>·-·Advertise·error</li><li><code·class="inline">eafnosupport</code>·-·Address·family·not·supported·by·protocol·family</li><li><code·class="inline">eagain</code>·-·Resource·temporarily·unavailable</li><li><code·class="inline">ealign</code>·-·EALIGN</li><li><code·class="inline">ealready</code>·-·Operation·already·in·progress</li><li><code·class="inline">ebade</code>·-·Bad·exchange·descriptor</li><li><code·class="inline">ebadf</code>·-·Bad·file·number</li><li><code·class="inline">ebadfd</code>·-·File·descriptor·in·bad·state</li><li><code·class="inline">ebadmsg</code>·-·Not·a·data·message</li><li><code·class="inline">ebadr</code>·-·Bad·request·descriptor</li><li><code·class="inline">ebadrpc</code>·-·Bad·RPC·structure</li><li><code·class="inline">ebadrqc</code>·-·Bad·request·code</li><li><code·class="inline">ebadslt</code>·-·Invalid·slot</li><li><code·class="inline">ebfont</code>·-·Bad·font·file·format</li><li><code·class="inline">ebusy</code>·-·File·busy</li><li><code·class="inline">echild</code>·-·No·children</li><li><code·class="inline">echrng</code>·-·Channel·number·out·of·range</li><li><code·class="inline">ecomm</code>·-·Communication·error·on·send</li><li><code·class="inline">econnaborted</code>·-·Software·caused·connection·abort</li><li><code·class="inline">econnrefused</code>·-·Connection·refused</li><li><code·class="inline">econnreset</code>·-·Connection·reset·by·peer</li><li><code·class="inline">edeadlk</code>·-·Resource·deadlock·avoided</li><li><code·class="inline">edeadlock</code>·-·Resource·deadlock·avoided</li><li><code·class="inline">edestaddrreq</code>·-·Destination·address·required</li><li><code·class="inline">edirty</code>·-·Mounting·a·dirty·fs·without·force</li><li><code·class="inline">edom</code>·-·Math·argument·out·of·range</li><li><code·class="inline">edotdot</code>·-·Cross·mount·point</li><li><code·class="inline">edquot</code>·-·Disk·quota·exceeded</li><li><code·class="inline">eduppkg</code>·-·Duplicate·package·name</li><li><code·class="inline">eexist</code>·-·File·already·exists</li><li><code·class="inline">efault</code>·-·Bad·address·in·system·call·argument</li><li><code·class="inline">efbig</code>·-·File·too·large</li><li><code·class="inline">ehostdown</code>·-·Host·is·down</li><li><code·class="inline">ehostunreach</code>·-·Host·is·unreachable</li><li><code·class="inline">eidrm</code>·-·Identifier·removed</li><li><code·class="inline">einit</code>·-·Initialization·error</li><li><code·class="inline">einprogress</code>·-·Operation·now·in·progress</li><li><code·class="inline">eintr</code>·-·Interrupted·system·call</li><li><code·class="inline">einval</code>·-·Invalid·argument</li><li><code·class="inline">eio</code>·-·I/O·error</li><li><code·class="inline">eisconn</code>·-·Socket·is·already·connected</li><li><code·class="inline">eisdir</code>·-·Illegal·operation·on·a·directory</li><li><code·class="inline">eisnam</code>·-·Is·a·named·file</li><li><code·class="inline">el2hlt</code>·-·Level·2·halted</li><li><code·class="inline">el2nsync</code>·-·Level·2·not·synchronized</li><li><code·class="inline">el3hlt</code>·-·Level·3·halted</li><li><code·class="inline">el3rst</code>·-·Level·3·reset</li><li><code·class="inline">elbin</code>·-·ELBIN</li><li><code·class="inline">elibacc</code>·-·Cannot·access·a·needed·shared·library</li><li><code·class="inline">elibbad</code>·-·Accessing·a·corrupted·shared·library</li><li><code·class="inline">elibexec</code>·-·Cannot·exec·a·shared·library·directly</li><li><code·class="inline">elibmax</code>·-·Attempting·to·link·in·more·shared·libraries·than·system·limit</li><li><code·class="inline">elibscn</code>·-·<code·class="inline">.lib</code>·section·in·<code·class="inline">a.out</code>·corrupted</li><li><code·class="inline">elnrng</code>·-·Link·number·out·of·range</li><li><code·class="inline">eloop</code>·-·Too·many·levels·of·symbolic·links</li><li><code·class="inline">emfile</code>·-·Too·many·open·files</li><li><code·class="inline">emlink</code>·-·Too·many·links</li><li><code·class="inline">emsgsize</code>·-·Message·too·long</li><li><code·class="inline">emultihop</code>·-·Multihop·attempted</li><li><code·class="inline">enametoolong</code>·-·Filename·too·long</li><li><code·class="inline">enavail</code>·-·Unavailable</li><li><code·class="inline">enet</code>·-·ENET</li><li><code·class="inline">enetdown</code>·-·Network·is·down</li><li><code·class="inline">enetreset</code>·-·Network·dropped·connection·on·reset</li><li><code·class="inline">enetunreach</code>·-·Network·is·unreachable</li><li><code·class="inline">enfile</code>·-·File·table·overflow</li><li><code·class="inline">enoano</code>·-·Anode·table·overflow</li><li><code·class="inline">enobufs</code>·-·No·buffer·space·available</li><li><code·class="inline">enocsi</code>·-·No·CSI·structure·available</li><li><code·class="inline">enodata</code>·-·No·data·available</li><li><code·class="inline">enodev</code>·-·No·such·device</li><li><code·class="inline">enoent</code>·-·No·such·file·or·directory</li><li><code·class="inline">enoexec</code>·-·Exec·format·error</li><li><code·class="inline">enolck</code>·-·No·locks·available</li><li><code·class="inline">enolink</code>·-·Link·has·been·severed</li><li><code·class="inline">enomem</code>·-·Not·enough·memory</li><li><code·class="inline">enomsg</code>·-·No·message·of·desired·type</li><li><code·class="inline">enonet</code>·-·Machine·is·not·on·the·network</li><li><code·class="inline">enopkg</code>·-·Package·not·installed</li><li><code·class="inline">enoprotoopt</code>·-·Bad·protocol·option</li><li><code·class="inline">enospc</code>·-·No·space·left·on·device</li><li><code·class="inline">enosr</code>·-·Out·of·stream·resources·or·not·a·stream·device</li><li><code·class="inline">enosym</code>·-·Unresolved·symbol·name</li><li><code·class="inline">enosys</code>·-·Function·not·implemented</li><li><code·class="inline">enotblk</code>·-·Block·device·required</li><li><code·class="inline">enotconn</code>·-·Socket·is·not·connected</li><li><code·class="inline">enotdir</code>·-·Not·a·directory</li><li><code·class="inline">enotempty</code>·-·Directory·not·empty</li><li><code·class="inline">enotnam</code>·-·Not·a·named·file</li><li><code·class="inline">enotsock</code>·-·Socket·operation·on·non-socket</li><li><code·class="inline">enotsup</code>·-·Operation·not·supported</li><li><code·class="inline">enotty</code>·-·Inappropriate·device·for·<code·class="inline">ioctl</code></li><li><code·class="inline">enotuniq</code>·-·Name·not·unique·on·network</li><li><code·class="inline">enxio</code>·-·No·such·device·or·address</li><li><code·class="inline">eopnotsupp</code>·-·Operation·not·supported·on·socket</li><li><code·class="inline">eperm</code>·-·Not·owner</li><li><code·class="inline">epfnosupport</code>·-·Protocol·family·not·supported</li><li><code·class="inline">epipe</code>·-·Broken·pipe</li><li><code·class="inline">eproclim</code>·-·Too·many·processes</li><li><code·class="inline">eprocunavail</code>·-·Bad·procedure·for·program</li><li><code·class="inline">eprogmismatch</code>·-·Wrong·program·version</li><li><code·class="inline">eprogunavail</code>·-·RPC·program·unavailable</li><li><code·class="inline">eproto</code>·-·Protocol·error</li><li><code·class="inline">eprotonosupport</code>·-·Protocol·not·supported</li><li><code·class="inline">eprototype</code>·-·Wrong·protocol·type·for·socket</li><li><code·class="inline">erange</code>·-·Math·result·unrepresentable</li><li><code·class="inline">erefused</code>·-·EREFUSED</li><li><code·class="inline">eremchg</code>·-·Remote·address·changed</li><li><code·class="inline">eremdev</code>·-·Remote·device</li><li><code·class="inline">eremote</code>·-·Pathname·hit·remote·filesystem</li><li><code·class="inline">eremoteio</code>·-·Remote·I/O·error</li><li><code·class="inline">eremoterelease</code>·-·EREMOTERELEASE</li><li><code·class="inline">erofs</code>·-·Read-only·filesystem</li><li><code·class="inline">erpcmismatch</code>·-·Wrong·RPC·version</li><li><code·class="inline">erremote</code>·-·Object·is·remote</li><li><code·class="inline">eshutdown</code>·-·Cannot·send·after·socket·shutdown</li><li><code·class="inline">esocktnosupport</code>·-·Socket·type·not·supported</li><li><code·class="inline">espipe</code>·-·Invalid·seek</li><li><code·class="inline">esrch</code>·-·No·such·process</li><li><code·class="inline">esrmnt</code>·-·Srmount·error</li><li><code·class="inline">estale</code>·-·Stale·remote·file·handle</li><li><code·class="inline">esuccess</code>·-·Error·0</li><li><code·class="inline">etime</code>·-·Timer·expired</li><li><code·class="inline">etimedout</code>·-·Connection·timed·out</li><li><code·class="inline">etoomanyrefs</code>·-·Too·many·references</li><li><code·class="inline">etxtbsy</code>·-·Text·file·or·pseudo-device·busy</li><li><code·class="inline">euclean</code>·-·Structure·needs·cleaning</li><li><code·class="inline">eunatch</code>·-·Protocol·driver·not·attached</li><li><code·class="inline">eusers</code>·-·Too·many·users</li><li><code·class="inline">eversion</code>·-·Version·mismatch</li><li><code·class="inline">ewouldblock</code>·-·Operation·would·block</li><li><code·class="inline">exdev</code>·-·Cross-device·link</li><li><code·class="inline">exfull</code>·-·Message·tables·full</li><li><code·class="inline">nxdomain</code>·-·Hostname·or·domain·name·cannot·be·found</li></ul>172 <ul><li><code·class="inline">e2big</code>·-·Too·long·argument·list</li><li><code·class="inline">eacces</code>·-·Permission·denied</li><li><code·class="inline">eaddrinuse</code>·-·Address·already·in·use</li><li><code·class="inline">eaddrnotavail</code>·-·Cannot·assign·requested·address</li><li><code·class="inline">eadv</code>·-·Advertise·error</li><li><code·class="inline">eafnosupport</code>·-·Address·family·not·supported·by·protocol·family</li><li><code·class="inline">eagain</code>·-·Resource·temporarily·unavailable</li><li><code·class="inline">ealign</code>·-·EALIGN</li><li><code·class="inline">ealready</code>·-·Operation·already·in·progress</li><li><code·class="inline">ebade</code>·-·Bad·exchange·descriptor</li><li><code·class="inline">ebadf</code>·-·Bad·file·number</li><li><code·class="inline">ebadfd</code>·-·File·descriptor·in·bad·state</li><li><code·class="inline">ebadmsg</code>·-·Not·a·data·message</li><li><code·class="inline">ebadr</code>·-·Bad·request·descriptor</li><li><code·class="inline">ebadrpc</code>·-·Bad·RPC·structure</li><li><code·class="inline">ebadrqc</code>·-·Bad·request·code</li><li><code·class="inline">ebadslt</code>·-·Invalid·slot</li><li><code·class="inline">ebfont</code>·-·Bad·font·file·format</li><li><code·class="inline">ebusy</code>·-·File·busy</li><li><code·class="inline">echild</code>·-·No·children</li><li><code·class="inline">echrng</code>·-·Channel·number·out·of·range</li><li><code·class="inline">ecomm</code>·-·Communication·error·on·send</li><li><code·class="inline">econnaborted</code>·-·Software·caused·connection·abort</li><li><code·class="inline">econnrefused</code>·-·Connection·refused</li><li><code·class="inline">econnreset</code>·-·Connection·reset·by·peer</li><li><code·class="inline">edeadlk</code>·-·Resource·deadlock·avoided</li><li><code·class="inline">edeadlock</code>·-·Resource·deadlock·avoided</li><li><code·class="inline">edestaddrreq</code>·-·Destination·address·required</li><li><code·class="inline">edirty</code>·-·Mounting·a·dirty·fs·without·force</li><li><code·class="inline">edom</code>·-·Math·argument·out·of·range</li><li><code·class="inline">edotdot</code>·-·Cross·mount·point</li><li><code·class="inline">edquot</code>·-·Disk·quota·exceeded</li><li><code·class="inline">eduppkg</code>·-·Duplicate·package·name</li><li><code·class="inline">eexist</code>·-·File·already·exists</li><li><code·class="inline">efault</code>·-·Bad·address·in·system·call·argument</li><li><code·class="inline">efbig</code>·-·File·too·large</li><li><code·class="inline">ehostdown</code>·-·Host·is·down</li><li><code·class="inline">ehostunreach</code>·-·Host·is·unreachable</li><li><code·class="inline">eidrm</code>·-·Identifier·removed</li><li><code·class="inline">einit</code>·-·Initialization·error</li><li><code·class="inline">einprogress</code>·-·Operation·now·in·progress</li><li><code·class="inline">eintr</code>·-·Interrupted·system·call</li><li><code·class="inline">einval</code>·-·Invalid·argument</li><li><code·class="inline">eio</code>·-·I/O·error</li><li><code·class="inline">eisconn</code>·-·Socket·is·already·connected</li><li><code·class="inline">eisdir</code>·-·Illegal·operation·on·a·directory</li><li><code·class="inline">eisnam</code>·-·Is·a·named·file</li><li><code·class="inline">el2hlt</code>·-·Level·2·halted</li><li><code·class="inline">el2nsync</code>·-·Level·2·not·synchronized</li><li><code·class="inline">el3hlt</code>·-·Level·3·halted</li><li><code·class="inline">el3rst</code>·-·Level·3·reset</li><li><code·class="inline">elbin</code>·-·ELBIN</li><li><code·class="inline">elibacc</code>·-·Cannot·access·a·needed·shared·library</li><li><code·class="inline">elibbad</code>·-·Accessing·a·corrupted·shared·library</li><li><code·class="inline">elibexec</code>·-·Cannot·exec·a·shared·library·directly</li><li><code·class="inline">elibmax</code>·-·Attempting·to·link·in·more·shared·libraries·than·system·limit</li><li><code·class="inline">elibscn</code>·-·<code·class="inline">.lib</code>·section·in·<code·class="inline">a.out</code>·corrupted</li><li><code·class="inline">elnrng</code>·-·Link·number·out·of·range</li><li><code·class="inline">eloop</code>·-·Too·many·levels·of·symbolic·links</li><li><code·class="inline">emfile</code>·-·Too·many·open·files</li><li><code·class="inline">emlink</code>·-·Too·many·links</li><li><code·class="inline">emsgsize</code>·-·Message·too·long</li><li><code·class="inline">emultihop</code>·-·Multihop·attempted</li><li><code·class="inline">enametoolong</code>·-·Filename·too·long</li><li><code·class="inline">enavail</code>·-·Unavailable</li><li><code·class="inline">enet</code>·-·ENET</li><li><code·class="inline">enetdown</code>·-·Network·is·down</li><li><code·class="inline">enetreset</code>·-·Network·dropped·connection·on·reset</li><li><code·class="inline">enetunreach</code>·-·Network·is·unreachable</li><li><code·class="inline">enfile</code>·-·File·table·overflow</li><li><code·class="inline">enoano</code>·-·Anode·table·overflow</li><li><code·class="inline">enobufs</code>·-·No·buffer·space·available</li><li><code·class="inline">enocsi</code>·-·No·CSI·structure·available</li><li><code·class="inline">enodata</code>·-·No·data·available</li><li><code·class="inline">enodev</code>·-·No·such·device</li><li><code·class="inline">enoent</code>·-·No·such·file·or·directory</li><li><code·class="inline">enoexec</code>·-·Exec·format·error</li><li><code·class="inline">enolck</code>·-·No·locks·available</li><li><code·class="inline">enolink</code>·-·Link·has·been·severed</li><li><code·class="inline">enomem</code>·-·Not·enough·memory</li><li><code·class="inline">enomsg</code>·-·No·message·of·desired·type</li><li><code·class="inline">enonet</code>·-·Machine·is·not·on·the·network</li><li><code·class="inline">enopkg</code>·-·Package·not·installed</li><li><code·class="inline">enoprotoopt</code>·-·Bad·protocol·option</li><li><code·class="inline">enospc</code>·-·No·space·left·on·device</li><li><code·class="inline">enosr</code>·-·Out·of·stream·resources·or·not·a·stream·device</li><li><code·class="inline">enosym</code>·-·Unresolved·symbol·name</li><li><code·class="inline">enosys</code>·-·Function·not·implemented</li><li><code·class="inline">enotblk</code>·-·Block·device·required</li><li><code·class="inline">enotconn</code>·-·Socket·is·not·connected</li><li><code·class="inline">enotdir</code>·-·Not·a·directory</li><li><code·class="inline">enotempty</code>·-·Directory·not·empty</li><li><code·class="inline">enotnam</code>·-·Not·a·named·file</li><li><code·class="inline">enotsock</code>·-·Socket·operation·on·non-socket</li><li><code·class="inline">enotsup</code>·-·Operation·not·supported</li><li><code·class="inline">enotty</code>·-·Inappropriate·device·for·<code·class="inline">ioctl</code></li><li><code·class="inline">enotuniq</code>·-·Name·not·unique·on·network</li><li><code·class="inline">enxio</code>·-·No·such·device·or·address</li><li><code·class="inline">eopnotsupp</code>·-·Operation·not·supported·on·socket</li><li><code·class="inline">eperm</code>·-·Not·owner</li><li><code·class="inline">epfnosupport</code>·-·Protocol·family·not·supported</li><li><code·class="inline">epipe</code>·-·Broken·pipe</li><li><code·class="inline">eproclim</code>·-·Too·many·processes</li><li><code·class="inline">eprocunavail</code>·-·Bad·procedure·for·program</li><li><code·class="inline">eprogmismatch</code>·-·Wrong·program·version</li><li><code·class="inline">eprogunavail</code>·-·RPC·program·unavailable</li><li><code·class="inline">eproto</code>·-·Protocol·error</li><li><code·class="inline">eprotonosupport</code>·-·Protocol·not·supported</li><li><code·class="inline">eprototype</code>·-·Wrong·protocol·type·for·socket</li><li><code·class="inline">erange</code>·-·Math·result·unrepresentable</li><li><code·class="inline">erefused</code>·-·EREFUSED</li><li><code·class="inline">eremchg</code>·-·Remote·address·changed</li><li><code·class="inline">eremdev</code>·-·Remote·device</li><li><code·class="inline">eremote</code>·-·Pathname·hit·remote·filesystem</li><li><code·class="inline">eremoteio</code>·-·Remote·I/O·error</li><li><code·class="inline">eremoterelease</code>·-·EREMOTERELEASE</li><li><code·class="inline">erofs</code>·-·Read-only·filesystem</li><li><code·class="inline">erpcmismatch</code>·-·Wrong·RPC·version</li><li><code·class="inline">erremote</code>·-·Object·is·remote</li><li><code·class="inline">eshutdown</code>·-·Cannot·send·after·socket·shutdown</li><li><code·class="inline">esocktnosupport</code>·-·Socket·type·not·supported</li><li><code·class="inline">espipe</code>·-·Invalid·seek</li><li><code·class="inline">esrch</code>·-·No·such·process</li><li><code·class="inline">esrmnt</code>·-·Srmount·error</li><li><code·class="inline">estale</code>·-·Stale·remote·file·handle</li><li><code·class="inline">esuccess</code>·-·Error·0</li><li><code·class="inline">etime</code>·-·Timer·expired</li><li><code·class="inline">etimedout</code>·-·Connection·timed·out</li><li><code·class="inline">etoomanyrefs</code>·-·Too·many·references</li><li><code·class="inline">etxtbsy</code>·-·Text·file·or·pseudo-device·busy</li><li><code·class="inline">euclean</code>·-·Structure·needs·cleaning</li><li><code·class="inline">eunatch</code>·-·Protocol·driver·not·attached</li><li><code·class="inline">eusers</code>·-·Too·many·users</li><li><code·class="inline">eversion</code>·-·Version·mismatch</li><li><code·class="inline">ewouldblock</code>·-·Operation·would·block</li><li><code·class="inline">exdev</code>·-·Cross-device·link</li><li><code·class="inline">exfull</code>·-·Message·tables·full</li><li><code·class="inline">nxdomain</code>·-·Hostname·or·domain·name·cannot·be·found</li></ul>
173 ····</section>173 ····</section>
Offset 953, 15 lines modifiedOffset 953, 15 lines modified
953 ···················h_addrtype·::·inet·|·inet6,953 ···················h_addrtype·::·inet·|·inet6,
954 ···················h_length·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),954 ···················h_length·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),
955 ···················h_addr_list·::·[<a·href="inet.html#t:ip_address/0">inet:ip_address</a>()]}.</pre>955 ···················h_addr_list·::·[<a·href="inet.html#t:ip_address/0">inet:ip_address</a>()]}.</pre>
  
956 ······</div>956 ······</div>
  
957 <p>A·record·describing·a·host;·name·and·address.</p><p>Corresponds·to·the·<code·class="inline">C</code>:·<code·class="inline">struct hostent</code>·as·returned·by·for·example957 <p>A·record·describing·a·host;·name·and·address.</p><p>Corresponds·to·the·<code·class="inline">C</code>:·<code·class="inline">struct hostent</code>·as·returned·by·for·example
958 <code·class="inline">gethostbyname(3)</code>.</p><p>The·record·is·defined·in·the·Kernel·include·file·<code·class="inline">&quot;inet.hrl&quot;</code>.</p><p>Add·the·following·directive·to·the·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6551954746-1">(</span><span·class="s">&quot;kernel/include/inet.hrl&quot;</span><span·class="p"·data-group-id="6551954746-1">)</span><span·class="p">.</span></code></pre>958 <code·class="inline">gethostbyname(3)</code>.</p><p>The·record·is·defined·in·the·Kernel·include·file·<code·class="inline">&quot;inet.hrl&quot;</code>.</p><p>Add·the·following·directive·to·the·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8070536533-1">(</span><span·class="s">&quot;kernel/include/inet.hrl&quot;</span><span·class="p"·data-group-id="8070536533-1">)</span><span·class="p">.</span></code></pre>
959 ··</section>959 ··</section>
960 </section>960 </section>
961 <section·class="detail"·id="t:hostname/0">961 <section·class="detail"·id="t:hostname/0">
  
962 ··<div·class="detail-header">962 ··<div·class="detail-header">
963 ····<a·href="#t:hostname/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">963 ····<a·href="#t:hostname/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">
964 ······<i·class="ri-link-m"·aria-hidden="true"></i>964 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 2050, 17 lines modifiedOffset 2050, 17 lines modified
2050 coded·in·native·endianness.</p><p>Asking·for·and·inspecting·raw·socket·options·require·low-level·information·about2050 coded·in·native·endianness.</p><p>Asking·for·and·inspecting·raw·socket·options·require·low-level·information·about
2051 the·current·operating·system·and·TCP·stack.</p><p><em>Example:</em></p><p>Consider·a·Linux·machine·where·option·<code·class="inline">TCP_INFO</code>·can·be·used·to·collect·TCP2051 the·current·operating·system·and·TCP·stack.</p><p><em>Example:</em></p><p>Consider·a·Linux·machine·where·option·<code·class="inline">TCP_INFO</code>·can·be·used·to·collect·TCP
2052 statistics·for·a·socket.·Assume·you·are·interested·in·field·<code·class="inline">tcpi_sacked</code>·of2052 statistics·for·a·socket.·Assume·you·are·interested·in·field·<code·class="inline">tcpi_sacked</code>·of
2053 <code·class="inline">struct·tcp_info</code>·filled·in·when·asking·for·<code·class="inline">TCP_INFO</code>.·To·be·able·to·access2053 <code·class="inline">struct·tcp_info</code>·filled·in·when·asking·for·<code·class="inline">TCP_INFO</code>.·To·be·able·to·access
2054 this·information,·you·need·to·know·the·following:</p><ul><li>The·numeric·value·of·protocol·level·<code·class="inline">IPPROTO_TCP</code></li><li>The·numeric·value·of·option·<code·class="inline">TCP_INFO</code></li><li>The·size·of·<code·class="inline">struct·tcp_info</code></li><li>The·size·and·offset·of·the·specific·field</li></ul><p>By·inspecting·the·headers·or·writing·a·small·C·program,·it·is·found·that2054 this·information,·you·need·to·know·the·following:</p><ul><li>The·numeric·value·of·protocol·level·<code·class="inline">IPPROTO_TCP</code></li><li>The·numeric·value·of·option·<code·class="inline">TCP_INFO</code></li><li>The·size·of·<code·class="inline">struct·tcp_info</code></li><li>The·size·and·offset·of·the·specific·field</li></ul><p>By·inspecting·the·headers·or·writing·a·small·C·program,·it·is·found·that
2055 <code·class="inline">IPPROTO_TCP</code>·is·6,·<code·class="inline">TCP_INFO</code>·is·11,·the·structure·size·is·92·(bytes),·the2055 <code·class="inline">IPPROTO_TCP</code>·is·6,·<code·class="inline">TCP_INFO</code>·is·11,·the·structure·size·is·92·(bytes),·the
2056 offset·of·<code·class="inline">tcpi_sacked</code>·is·28·bytes,·and·the·value·is·a·32-bit·integer.·The2056 offset·of·<code·class="inline">tcpi_sacked</code>·is·28·bytes,·and·the·value·is·a·32-bit·integer.·The
2057 following·code·can·be·used·to·retrieve·the·value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">get_tcpi_sacked</span><span·class="p"·data-group-id="3145805410-1">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="3145805410-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">2057 following·code·can·be·used·to·retrieve·the·value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">get_tcpi_sacked</span><span·class="p"·data-group-id="7240955840-1">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7240955840-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
2058 ····</span><span·class="p"·data-group-id="3145805410-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3145805410-3">[</span><span·class="p"·data-group-id="3145805410-4">{</span><span·class="ss">raw</span><span·class="p">,</span><span·class="p">_</span><sp[·...·truncated·by·diffoscope;·len:·942,·SHA:·9ad6bf17cb1de39001d02e1f04c1220082628c0b035acde34f4653a1910abbbf·...·]0-5">)</span><span·class="p">,</span><span·class="w">2058 ····</span><span·class="p"·data-group-id="7240955840-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7240955840-3">[</span><span·class="p"·data-group-id="7240955840-4">{</span><span·class="ss">raw</span><span·class="p">,</span><span·class="p">_</span><sp[·...·truncated·by·diffoscope;·len:·942,·SHA:·7b4583798c2caea84a062b59e3e5200e55d9acd50e7009ce1815e9df03ae5ef1·...·]0-5">)</span><span·class="p">,</span><span·class="w">
2059 ····</span><span·class="p"·data-group-id="3145805410-8">&lt;&lt;</span><span·class="p">_</span><span·class="p">:</span><span·class="mi">28</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">TcpiSacked</span><span·class="p">:</span><span·class="mi">3[·...·truncated·by·diffoscope;·len:·204,·SHA:·aeb9f014df7dedb0c0515adfa9a34a982993a3fb95dc51a6c1bf418b57387943·...·]0-8">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">2059 ····</span><span·class="p"·data-group-id="7240955840-8">&lt;&lt;</span><span·class="p">_</span><span·class="p">:</span><span·class="mi">28</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="n">TcpiSacked</span><span·class="p">:</span><span·class="mi">3[·...·truncated·by·diffoscope;·len:·204,·SHA:·dbbce2f2a98ff6268f4cea31f5f974f901250f08c1e59c4e2726fa5fa66e2134·...·]0-8">&gt;&gt;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">
2060 ····</span><span·class="n">TcpiSacked</span><span·class="p">.</span></code></pre><p>Preferably,·you·would·check·the·machine·type,·the·operating·system,·and·the2060 ····</span><span·class="n">TcpiSacked</span><span·class="p">.</span></code></pre><p>Preferably,·you·would·check·the·machine·type,·the·operating·system,·and·the
2061 Kernel·version·before·executing·anything·similar·to·this·code.</p>2061 Kernel·version·before·executing·anything·similar·to·this·code.</p>
2062 ··</section>2062 ··</section>
2063 </section>2063 </section>
2064 <section·class="detail"·id="getstat/1">2064 <section·class="detail"·id="getstat/1">
  
2065 ··<div·class="detail-header">2065 ··<div·class="detail-header">
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2381 ······<div·class="specs">2381 ······<div·class="specs">
  
2382 ··········<pre·translate="no"><span·class="attribute">-spec</span>·monitor(Socket)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0">reference</a>()·when·Socket·::·<a·href="#t:socket/0">socket</a>().</pre>2382 ··········<pre·translate="no"><span·class="attribute">-spec</span>·monitor(Socket)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0">reference</a>()·when·Socket·::·<a·href="#t:socket/0">socket</a>().</pre>
  
2383 ······</div>2383 ······</div>
  
2384 <p>Start·a·socket·monitor.</p><p>If·the·<code·class="inline">Socket</code>·to·monitor·doesn't·exist·or·when·the·monitor·is·triggered,2384 <p>Start·a·socket·monitor.</p><p>If·the·<code·class="inline">Socket</code>·to·monitor·doesn't·exist·or·when·the·monitor·is·triggered,
2385 a·<code·class="inline">'DOWN'</code>·message·is·sent·that·has·the·following·pattern:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»     ····</span><span·class="p"·data-group-id="8645042435-1">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MonitorRef</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·153,·SHA:·7e5d624bd902f2f4413922d4d42a2883ff26b3b5b3481fec13ab468aab09ee59·...·]-1">}</span></code></pre><ul><li><p><strong><code·class="inline">MonitorRef</code></strong>·-·The·return·value·from·this·function.</p></li><li><p><strong><code·class="inline">Type</code></strong>·-·The·type·of·socket,·can·be·one·of·the·following2385 a·<code·class="inline">'DOWN'</code>·message·is·sent·that·has·the·following·pattern:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»     ····</span><span·class="p"·data-group-id="5708752876-1">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MonitorRef</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·153,·SHA:·4c05a15d3fac55ca6c466a5b68ad3ed0d393d7e67c0e591446cfd49434ae873f·...·]-1">}</span></code></pre><ul><li><p><strong><code·class="inline">MonitorRef</code></strong>·-·The·return·value·from·this·function.</p></li><li><p><strong><code·class="inline">Type</code></strong>·-·The·type·of·socket,·can·be·one·of·the·following
2386 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0"><code·class="inline">atom/0</code></a>s:·<code·class="inline">port</code>·or·<code·class="inline">socket</code>.</p></li><li><p><strong><code·class="inline">Object</code></strong>·-·The·monitored·entity,·the·socket,·which·triggered·the·event.</p></li><li><p><strong><code·class="inline">Info</code></strong>·-·Either·the·termination·reason·of·the·socket·or·<code·class="inline">nosock</code>2386 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0"><code·class="inline">atom/0</code></a>s:·<code·class="inline">port</code>·or·<code·class="inline">socket</code>.</p></li><li><p><strong><code·class="inline">Object</code></strong>·-·The·monitored·entity,·the·socket,·which·triggered·the·event.</p></li><li><p><strong><code·class="inline">Info</code></strong>·-·Either·the·termination·reason·of·the·socket·or·<code·class="inline">nosock</code>
2387 (the·<code·class="inline">Socket</code>·did·not·exist·when·this·function·was·called).</p></li></ul><p>Making·several·calls·to·<a·href="#monitor/1"><code·class="inline">inet:monitor/1</code></a>·for·the·same·<code·class="inline">Socket</code>2387 (the·<code·class="inline">Socket</code>·did·not·exist·when·this·function·was·called).</p></li></ul><p>Making·several·calls·to·<a·href="#monitor/1"><code·class="inline">inet:monitor/1</code></a>·for·the·same·<code·class="inline">Socket</code>
2388 is·not·an·error;·one·monitor·is·created·per·call.</p><p>The·monitor·is·triggered·when·the·socket·is·closed·in·any·way·such·as2388 is·not·an·error;·one·monitor·is·created·per·call.</p><p>The·monitor·is·triggered·when·the·socket·is·closed·in·any·way·such·as
2389 an·API·call,·remote·end·close,·closed·by·signal·when·owner·exits,·...</p>2389 an·API·call,·remote·end·close,·closed·by·signal·when·owner·exits,·...</p>
2390 ··</section>2390 ··</section>
2391 </section>2391 </section>
2392 <section·class="detail"·id="ntoa/1">2392 <section·class="detail"·id="ntoa/1">
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3220 ······<p·class="built-using">3220 ······<p·class="built-using">
3221 ········Built·using3221 ········Built·using
3222 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3222 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3223 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3223 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3224 ······</p>3224 ······</p>
3225 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3225 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3226 ····</footer>3226 ····</footer>
3227 ··</div>3227 ··</div>
3228 </main>3228 </main>
3229 </div>3229 </div>
3230 <script>3230 <script>
3231 ··function·mermaidLoaded()·{3231 ··function·mermaidLoaded()·{
3232 ····mermaid.initialize({3232 ····mermaid.initialize({
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175 <p>The·following·data·types·concern·the·DNS·client:</p><h2·id="module-example"·class="section-heading">175 <p>The·following·data·types·concern·the·DNS·client:</p><h2·id="module-example"·class="section-heading">
176 ··<a·href="#module-example"·class="hover-link">176 ··<a·href="#module-example"·class="hover-link">
177 ····<i·class="ri-link-m"·aria-hidden="true"></i>177 ····<i·class="ri-link-m"·aria-hidden="true"></i>
178 ··</a>178 ··</a>
179 ··<span·class="text">Example</span>179 ··<span·class="text">Example</span>
180 </h2>180 </h2>
181 <p>This·access·functions·example·shows·how·<a·href="#lookup/3"><code·class="inline">lookup/3</code></a>·can·be·implemented·using181 <p>This·access·functions·example·shows·how·<a·href="#lookup/3"><code·class="inline">lookup/3</code></a>·can·be·implemented·using
182 <a·href="#resolve/3"><code·class="inline">resolve/3</code></a>·from·outside·the·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">example_lookup</span><span·class="p"·data-group-id="4819618670-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Class</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="4819618670-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 <a·href="#resolve/3"><code·class="inline">resolve/3</code></a>·from·outside·the·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">example_lookup</span><span·class="p"·data-group-id="9381808846-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Class</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="9381808846-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">inet_res</span><span·class="p">:</span><span·class="nf">resolve</span><span·class="p"·data-group-id="4819618670-2">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Class</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="4819618670-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">183 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">inet_res</span><span·class="p">:</span><span·class="nf">resolve</span><span·class="p"·data-group-id="9381808846-2">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Class</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="9381808846-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
184 ········</span><span·class="p"·data-group-id="4819618670-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Msg</span><span·class="p"·data-group-id="4819618670-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 ········</span><span·class="p"·data-group-id="9381808846-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Msg</span><span·class="p"·data-group-id="9381808846-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ············</span><span·class="p"·data-group-id="4819618670-4">[</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="4819618670-5">(</span><span·class="n">RR</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">data</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·5a56180b0bad7ef43bc59ad7506c01c090d558218f1cf9d275f09463f9b6a4e0·...·]-5">)</span><span·class="w">185 ············</span><span·class="p"·data-group-id="9381808846-4">[</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="9381808846-5">(</span><span·class="n">RR</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">data</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·fdf14ddc59575546bf3871ac9af908cf161ba2cb2a33808e42567bab69e522c3·...·]-5">)</span><span·class="w">
186 ·············</span><span·class="p">||</span><span·class="w">·</span><span·class="n">RR</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="4819618670-6">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">anlist</span><span·class="p"·data-group-id="4819618670-6">)</span><span·class="p">,</span><span·class="w">186 ·············</span><span·class="p">||</span><span·class="w">·</span><span·class="n">RR</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="9381808846-6">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">anlist</span><span·class="p"·data-group-id="9381808846-6">)</span><span·class="p">,</span><span·class="w">
187 ·················</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="4819618670-7">(</span><span·class="n">RR</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">type</span><span·class="p"·data-group-id="4819618670-7">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">187 ·················</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="9381808846-7">(</span><span·class="n">RR</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">type</span><span·class="p"·data-group-id="9381808846-7">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">
188 ·················</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="4819618670-8">(</span><span·class="n">RR</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">class</span><span·class="p"·data-group-id="4819618670-8">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·64,·SHA:·f16b5fded7060ea144f6ef58bee0317957c10e2a183e331a295d6a13c692d915·...·]-4">]</span><span·class="p">;</span><span·class="w">188 ·················</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="9381808846-8">(</span><span·class="n">RR</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">class</span><span·class="p"·data-group-id="9381808846-8">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·64,·SHA:·e0a246a607d2a193aed52c56b4bbca2ffdc86af76348cd5eccbffce65b07139d·...·]-4">]</span><span·class="p">;</span><span·class="w">
189 ········</span><span·class="p"·data-group-id="4819618670-9">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="4819618670-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">189 ········</span><span·class="p"·data-group-id="9381808846-9">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="9381808846-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
190 ············</span><span·class="p"·data-group-id="4819618670-10">[</span><span·class="p"·data-group-id="4819618670-10">]</span><span·class="w">190 ············</span><span·class="p"·data-group-id="9381808846-10">[</span><span·class="p"·data-group-id="9381808846-10">]</span><span·class="w">
191 ·····</span><span·class="k">end</span><span·class="p">.</span></code></pre>191 ·····</span><span·class="k">end</span><span·class="p">.</span></code></pre>
192 ····</section>192 ····</section>
  
193 </div>193 </div>
  
194 ··<section·id="summary"·class="details-list">194 ··<section·id="summary"·class="details-list">
195 ····<h1·class="section-heading">195 ····<h1·class="section-heading">
Offset 584, 65 lines modifiedOffset 584, 65 lines modified
584 ··········<pre·translate="no"><span·class="attribute">-type</span>·dns_msg()·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>584 ··········<pre·translate="no"><span·class="attribute">-type</span>·dns_msg()·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
585 ······</div>585 ······</div>
  
586 <p>A·DNS·message.</p><p>This·is·the·start·of·a·hierarchy·of·opaque·data·structures·that·can·be586 <p>A·DNS·message.</p><p>This·is·the·start·of·a·hierarchy·of·opaque·data·structures·that·can·be
587 examined·with·access·functions·in·<code·class="inline">inet_dns</code>,·which·return·lists·of587 examined·with·access·functions·in·<code·class="inline">inet_dns</code>,·which·return·lists·of
588 <code·class="inline">{Field,Value}</code>·tuples.·The·arity·2·functions·return·the·value588 <code·class="inline">{Field,Value}</code>·tuples.·The·arity·2·functions·return·the·value
589 for·a·specified·field.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">dns_msg</span><span·class="p"·data-group-id="3790573059-1">(</span><span·class="p"·data-group-id="3790573059-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsMsg</span><span·class="w">589 for·a·specified·field.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">dns_msg</span><span·class="p"·data-group-id="3543920541-1">(</span><span·class="p"·data-group-id="3543920541-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsMsg</span><span·class="w">
590 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="3790573059-2">(</span><span·class="n">DnsMsg</span><span·class="p"·data-group-id="3790573059-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">590 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="3543920541-2">(</span><span·class="n">DnsMsg</span><span·class="p"·data-group-id="3543920541-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
591 ········</span><span·class="p"·data-group-id="3790573059-3">[</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-4">{</span><span·class="ss">header</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_header</span><span·class="p"·data-group-id="3790573059-5">([·...·truncated·by·diffoscope;·len:·101,·SHA:·0db2b8d5b223abf094a2dd56f540c29b4b78874f701f2248a146bffd3890c3cb·...·]-4">}</span><span·class="w">591 ········</span><span·class="p"·data-group-id="3543920541-3">[</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-4">{</span><span·class="ss">header</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_header</span><span·class="p"·data-group-id="3543920541-5">([·...·truncated·by·diffoscope;·len:·101,·SHA:·a932599b95929a3e0939bcf1492ebcff94fe70ab3eb70239067c4369038f3bb0·...·]-4">}</span><span·class="w">
592 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-6">{</span><span·class="ss">qdlist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3790573059-7">(</span><span·class="p"·data-group-id="3790573059-7">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·d56362fb1a9a2ee781455bc5d608e298a33b0970768811ce2a6c596472965b9c·...·]-6">}</span><span·class="w">592 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-6">{</span><span·class="ss">qdlist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3543920541-7">(</span><span·class="p"·data-group-id="3543920541-7">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·e230600917294d054bcf5da3e6176d24b29407df3255e52b375f1bdf394dc59c·...·]-6">}</span><span·class="w">
593 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-8">{</span><span·class="ss">anlist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3790573059-9">(</span><span·class="p"·data-group-id="3790573059-9">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-8">}</span><span·class="w">593 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-8">{</span><span·class="ss">anlist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3543920541-9">(</span><span·class="p"·data-group-id="3543920541-9">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-8">}</span><span·class="w">
594 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-10">{</span><span·class="ss">nslist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3790573059-11">(</span><span·class="p"·data-group-id="3790573059-11">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·d56362fb1a9a2ee781455bc5d608e298a33b0970768811ce2a6c596472965b9c·...·]-10">}</span><span·class="w">594 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-10">{</span><span·class="ss">nslist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3543920541-11">(</span><span·class="p"·data-group-id="3543920541-11">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·e230600917294d054bcf5da3e6176d24b29407df3255e52b375f1bdf394dc59c·...·]-10">}</span><span·class="w">
595 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-12">{</span><span·class="ss">arlist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3790573059-13">(</span><span·class="p"·data-group-id="3790573059-13">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·101,·SHA:·9ae99f387781b60e72c4c692e7bd2cb3b350a7be1c4fda828e3913cf0574f5f4·...·]-3">]</span><span·class="w">595 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-12">{</span><span·class="ss">arlist</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3543920541-13">(</span><span·class="p"·data-group-id="3543920541-13">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·101,·SHA:·f80453f9d7d58b61022e4865a8756351c9bcd92404251c02fc86c99f42cfd37a·...·]-3">]</span><span·class="w">
596 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="3790573059-14">(</span><span·class="n">DnsMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">header</span><span·class="p"·data-group-id="3790573059-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·132,·SHA:·9dc96925095c5f1569fd3b34b61fd760511f7746631f952d9a3e8f098bff3de0·...·]-15">)</span><span·class="w">·</span><span·class="c1">%·for·example</span><span·class="w">596 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="3543920541-14">(</span><span·class="n">DnsMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">header</span><span·class="p"·data-group-id="3543920541-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·132,·SHA:·389dcb4e6f0ddc5f3e82b96adcbe4b04f20aa0ede9760b0f19ba757b135f1cb5·...·]-15">)</span><span·class="w">·</span><span·class="c1">%·for·example</span><span·class="w">
597 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="3790573059-16">(</span><span·class="n">DnsMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3790573059-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="w">597 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">msg</span><span·class="p"·data-group-id="3543920541-16">(</span><span·class="n">DnsMsg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3543920541-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="w">
  
598 </span><span·class="nf">dns_header</span><span·class="p"·data-group-id="3790573059-17">(</span><span·class="p"·data-group-id="3790573059-17">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsHeader</span><span·class="w">598 </span><span·class="nf">dns_header</span><span·class="p"·data-group-id="3543920541-17">(</span><span·class="p"·data-group-id="3543920541-17">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsHeader</span><span·class="w">
599 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">header</span><span·class="p"·data-group-id="3790573059-18">(</span><span·class="n">DnsHeader</span><span·class="p"·data-group-id="3790573059-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">599 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">header</span><span·class="p"·data-group-id="3543920541-18">(</span><span·class="n">DnsHeader</span><span·class="p"·data-group-id="3543920541-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
600 ········</span><span·class="p"·data-group-id="3790573059-19">[</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-20">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-21">(</sp[·...·truncated·by·diffoscope;·len:·98,·SHA:·418893b32f95512ddd29392befb7d3a1edb2531ec075bd556fb14382516c44cd·...·]-20">}</span><span·class="w">600 ········</span><span·class="p"·data-group-id="3543920541-19">[</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-20">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-21">(</sp[·...·truncated·by·diffoscope;·len:·98,·SHA:·11bce91a0ec53eb7a94e7fbd303e06c2507a93c179d4a564e47d0475006a7012·...·]-20">}</span><span·class="w">
601 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-22">{</span><span·class="ss">qr</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3790573059-23">(</span><span·class="p"·data-group-id="3790573059-23">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-22">}</span><span·class="w">601 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-22">{</span><span·class="ss">qr</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3543920541-23">(</span><span·class="p"·data-group-id="3543920541-23">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-22">}</span><span·class="w">
602 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-24">{</span><span·class="ss">opcode</span><span·class="p">,</span><span·class="w">·</span><span·class="k">query</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">iquery</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·328,·SHA:·645fa490ff5e7d4fb750becc973b283232009692a6a5c009ef7f34623fd39f71·...·]-24">}</span><span·class="w">602 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-24">{</span><span·class="ss">opcode</span><span·class="p">,</span><span·class="w">·</span><span·class="k">query</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">iquery</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·328,·SHA:·66a3e11a9e5c27ec3f4144d45eb92fa753f11d5ccd2837dee96a7ef3a8f0400a·...·]-24">}</span><span·class="w">
603 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-26">{</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3790573059-27">(</span><span·class="p"·data-group-id="3790573059-27">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-26">}</span><span·class="w">603 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-26">{</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3543920541-27">(</span><span·class="p"·data-group-id="3543920541-27">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-26">}</span><span·class="w">
604 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-28">{</span><span·class="ss">tc</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3790573059-29">(</span><span·class="p"·data-group-id="3790573059-29">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-28">}</span><span·class="w">604 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-28">{</span><span·class="ss">tc</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3543920541-29">(</span><span·class="p"·data-group-id="3543920541-29">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-28">}</span><span·class="w">
605 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-30">{</span><span·class="ss">rd</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3790573059-31">(</span><span·class="p"·data-group-id="3790573059-31">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-30">}</span><span·class="w">605 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-30">{</span><span·class="ss">rd</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3543920541-31">(</span><span·class="p"·data-group-id="3543920541-31">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-30">}</span><span·class="w">
606 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-32">{</span><span·class="ss">ra</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3790573059-33">(</span><span·class="p"·data-group-id="3790573059-33">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-32">}</span><span·class="w">606 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-32">{</span><span·class="ss">ra</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3543920541-33">(</span><span·class="p"·data-group-id="3543920541-33">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-32">}</span><span·class="w">
607 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-34">{</span><span·class="ss">pr</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3790573059-35">(</span><span·class="p"·data-group-id="3790573059-35">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb2ead4d7d5711c6594f1c9db5a7a544d0780a5146bb387e2b9b85595bee9bfc·...·]-34">}</span><span·class="w">607 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-34">{</span><span·class="ss">pr</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">boolean</span><span·class="p"·data-group-id="3543920541-35">(</span><span·class="p"·data-group-id="3543920541-35">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·bfdd71dbf8a3d1ba96ed542dd4c942d9f0ce2dbc62ea7014987eb1d24abb7e7e·...·]-34">}</span><span·class="w">
608 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-36">{</span><span·class="ss">rcode</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-37">(</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·200,·SHA:·6bf453e3246d45a6086fb0994f625a0b4e014353406abcdbe7393870e1ffa269·...·]-19">]</span><span·class="w">608 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-36">{</span><span·class="ss">rcode</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-37">(</span><span·class="mi">0</span><span·class="p">.</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·200,·SHA:·26ad50fc62eaf014f6a55e790f5b9bee2078ea7fc82f5aefdad6904dcc9e0daf·...·]-19">]</span><span·class="w">
609 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">header</span><span·class="p"·data-group-id="3790573059-38">(</span><span·class="n">DnsHeader</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3790573059-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="w">609 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">header</span><span·class="p"·data-group-id="3543920541-38">(</span><span·class="n">DnsHeader</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3543920541-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="w">
  
610 </span><span·class="nf">query_type</span><span·class="p"·data-group-id="3790573059-39">(</span><span·class="p"·data-group-id="3790573059-39">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">axfr</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·423,·SHA:·09091b860a37452c78f7ff466a17f801e3e8d96645e08be23187f81ef6f30bc3·...·]-40">)</span><span·class="w">610 </span><span·class="nf">query_type</span><span·class="p"·data-group-id="3543920541-39">(</span><span·class="p"·data-group-id="3543920541-39">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">axfr</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·423,·SHA:·6d2598ad1b5b20512f965cc437015ded4b53c98c2760fbe13ff0d8a513344035·...·]-40">)</span><span·class="w">
  
611 </span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3790573059-41">(</span><span·class="p"·data-group-id="3790573059-41">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsQuery</span><span·class="w">611 </span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3543920541-41">(</span><span·class="p"·data-group-id="3543920541-41">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsQuery</span><span·class="w">
612 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3790573059-42">(</span><span·class="n">DnsQuery</span><span·class="p"·data-group-id="3790573059-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">612 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3543920541-42">(</span><span·class="n">DnsQuery</span><span·class="p"·data-group-id="3543920541-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
613 ········</span><span·class="p"·data-group-id="3790573059-43">[</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-44">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_name</span><span·class="p"·data-group-id="3790573059-45">[·...·truncated·by·diffoscope;·len:·103,·SHA:·94bd6b563120311a20ea74a847675da196aff85e62b24a0ae5db7f75a8191964·...·]-44">}</span><span·class="w">613 ········</span><span·class="p"·data-group-id="3543920541-43">[</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-44">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_name</span><span·class="p"·data-group-id="3543920541-45">[·...·truncated·by·diffoscope;·len:·103,·SHA:·7ff95d31d3da6d85d0c12be715a4ca3e65abef7c5192161a4c11793532a901bd·...·]-44">}</span><span·class="w">
614 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-46">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">query_type</span><span·class="p"·data-group-id="3790573059-47">(</span><span·class="p"·data-group-id="3790573059-47">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·91aaa31e14014e5196a045ca5f0216723a54ba4521ba772eb0c8bd770548f7ba·...·]-46">}</span><span·class="w">614 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-46">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">query_type</span><span·class="p"·data-group-id="3543920541-47">(</span><span·class="p"·data-group-id="3543920541-47">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·eaa2e072798e395f70188cb16f28f489fad34b7540effb3f3f770c1c694f9785·...·]-46">}</span><span·class="w">
615 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-48">{</span><span·class="ss">class</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_class</span><span·class="p"·data-group-id="3790573059-49">(</span><span·class="p"·data-group-id="3790573059-49">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·103,·SHA:·290f43999703893846910907dce9a96e0ec937933c3b1174158e2623484c721b·...·]-43">]</span><span·class="w">615 ········</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-48">{</span><span·class="ss">class</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_class</span><span·class="p"·data-group-id="3543920541-49">(</span><span·class="p"·data-group-id="3543920541-49">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·103,·SHA:·8e750df47eafda77a225497eb75c9ec71ded311886ec0ddff2e48165768b6897·...·]-43">]</span><span·class="w">
616 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3790573059-50">(</span><span·class="n">DnsQuery</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3790573059-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="w">616 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="3543920541-50">(</span><span·class="n">DnsQuery</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3543920541-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Value</span><span·class="w">
  
617 </span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3790573059-51">(</span><span·class="p"·data-group-id="3790573059-51">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsRr</span><span·class="w">617 </span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="3543920541-51">(</span><span·class="p"·data-group-id="3543920541-51">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">DnsRr</span><span·class="w">
618 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="3790573059-52">(</span><span·class="n">DnsRr</span><span·class="p"·data-group-id="3790573059-52">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">DnsRrFields</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">DnsRrOptFields</span><span·class="w">618 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="3543920541-52">(</span><span·class="n">DnsRr</span><span·class="p"·data-group-id="3543920541-52">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">DnsRrFields</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">DnsRrOptFields</span><span·class="w">
619 ····</span><span·class="n">DnsRrFields</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-53">[</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-54">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_name</span><span·class="p"·data-group-id="3790573059-55">[·...·truncated·by·diffoscope;·len:·103,·SHA:·a6ce3b02d44ce13b9c18729480dde766e3a82fd9e19e9f727042ec52e97ebd35·...·]-54">}</span><span·class="w">619 ····</span><span·class="n">DnsRrFields</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-53">[</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-54">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_name</span><span·class="p"·data-group-id="3543920541-55">[·...·truncated·by·diffoscope;·len:·103,·SHA:·e8d982c12d3bb30d29bbd605e3ebceb0635b98416293bd9888a1c33f5b01c160·...·]-54">}</span><span·class="w">
620 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-56">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr_type</span><span·class="p"·data-group-id="3790573059-57">(</span><span·class="p"·data-group-id="3790573059-57">)</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·884c53a1d6a3684119bb150d2ee0597a4348647abd5eed7ff2d09a5c7ac5b8d1·...·]-56">}</span><span·class="w">620 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-56">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_rr_type</span><span·class="p"·data-group-id="3543920541-57">(</span><span·class="p"·data-group-id="3543920541-57">)</span><span·class="p"[·...·truncated·by·diffoscope;·len:·26,·SHA:·b024049c88fc8c713ed9d55dc0df1d779cdd1f800206f20590a958a30523cdfa·...·]-56">}</span><span·class="w">
621 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-58">{</span><span·class="ss">class</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_class</span><span·class="p"·data-group-id="3790573059-59">(</span><span·class="p"·data-group-id="3790573059-59">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·91aaa31e14014e5196a045ca5f0216723a54ba4521ba772eb0c8bd770548f7ba·...·]-58">}</span><span·class="w">621 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-58">{</span><span·class="ss">class</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_class</span><span·class="p"·data-group-id="3543920541-59">(</span><span·class="p"·data-group-id="3543920541-59">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·eaa2e072798e395f70188cb16f28f489fad34b7540effb3f3f770c1c694f9785·...·]-58">}</span><span·class="w">
622 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-60">{</span><span·class="ss">ttl</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-61">(</span><span·class="p"·data-group-id="3790573059-61">)</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·21970bf312d060a6d72356cdec7c722520422057264db427d84dda7cc2fb62bd·...·]-60">}</span><span·class="w">622 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-60">{</span><span·class="ss">ttl</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-61">(</span><span·class="p"·data-group-id="3543920541-61">)</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·a3acea674cc89caaf76b87d9065a03c4e924124e8088e389f4f3d1664550d016·...·]-60">}</span><span·class="w">
623 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-62">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_data</span><span·class="p"·data-group-id="3790573059-63">(</span><span·class="p"·data-group-id="3790573059-63">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·101,·SHA:·17eca902cdb45c1d023db92a8a0dd638cf7dac7883bf1243f7ce4dd4486ce7d8·...·]-53">]</span><span·class="w">623 ··················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-62">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_data</span><span·class="p"·data-group-id="3543920541-63">(</span><span·class="p"·data-group-id="3543920541-63">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·101,·SHA:·0ca3144df7a518e7d0af7a22a7e177bbfb0d70d81501c81062e69649a8c64a47·...·]-53">]</span><span·class="w">
624 ····</span><span·class="n">DnsRrOptFields</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-64">[</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-65">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_name</span><span·class="p"·data-group-id="3790573059-66">[·...·truncated·by·diffoscope;·len:·103,·SHA:·1f85f395e426406b08d792337cbc0cb06842c62f2ad22ecd0b01807f6f75bb2d·...·]-65">}</span><span·class="w">624 ····</span><span·class="n">DnsRrOptFields</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-64">[</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-65">{</span><span·class="ss">domain</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_name</span><span·class="p"·data-group-id="3543920541-66">[·...·truncated·by·diffoscope;·len:·103,·SHA:·654d2d3f8585afac0d96eb96f4210e441889a2f3e3685a3fab96243d13999f66·...·]-65">}</span><span·class="w">
625 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-67">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">opt</span><span·class="p"·data-group-id="3790573059-67">}</span><span·class="w">625 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-67">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">opt</span><span·class="p"·data-group-id="3543920541-67">}</span><span·class="w">
626 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-68">{</span><span·class="ss">udp_payload_size</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-69">(</span><span·class="p"·data-group-id="3790573059-69">)</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·50f2802f24ae41bfa680cfb2103f6a495c72e6c69e3eacdaffa87ea95704aeed·...·]-68">}</span><span·class="w">626 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-68">{</span><span·class="ss">udp_payload_size</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-69">(</span><span·class="p"·data-group-id="3543920541-69">)</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·434b482057717c7f103d9edec5f301d662c37c8b2d0bd0b2871df792adf1e99b·...·]-68">}</span><span·class="w">
627 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-70">{</span><span·class="ss">ext_rcode</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-71">(</span><span·class="p"·data-group-id="3790573059-71">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·870d6ffb211ad54fb1265e9be66eaa7740b93a4cfb722666b161a27fa159873a·...·]-70">}</span><span·class="w">627 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-70">{</span><span·class="ss">ext_rcode</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-71">(</span><span·class="p"·data-group-id="3543920541-71">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·b09d066312ce774c395d9213943a535c44b2b236ada87fc5ee61a4175b1be2ac·...·]-70">}</span><span·class="w">
628 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-72">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-73">(</span><span·class="p"·data-group-id="3790573059-73">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·91aaa31e14014e5196a045ca5f0216723a54ba4521ba772eb0c8bd770548f7ba·...·]-72">}</span><span·class="w">628 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-72">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-73">(</span><span·class="p"·data-group-id="3543920541-73">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·eaa2e072798e395f70188cb16f28f489fad34b7540effb3f3f770c1c694f9785·...·]-72">}</span><span·class="w">
629 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-74">{</span><span·class="ss">z</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3790573059-75">(</span><span·class="p"·data-group-id="3790573059-75">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·d030d34121eff716032cfda241f38cfdca182085d7f9fc237f572e66bc45c2a1·...·]-74">}</span><span·class="w">629 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-74">{</span><span·class="ss">z</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3543920541-75">(</span><span·class="p"·data-group-id="3543920541-75">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·90dcbe6238aa14abc2d05ee4acf52dbb57c0a0956e7602d3ecfd9a18d5f893a1·...·]-74">}</span><span·class="w">
630 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3790573059-76">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_data</span><span·class="p"·data-group-id="3790573059-77">(</span><span·class="p"·data-group-id="3790573059-77">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·101,·SHA:·ab591cee3a51ec4bc34d106f2a57832e8d0789b7a10cd2dd185149a3382851fa·...·]-64">]</span><span·class="w">630 ·····················</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="3543920541-76">{</span><span·class="ss">data</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">dns_data</span><span·class="p"·data-group-id="3543920541-77">(</span><span·class="p"·data-group-id="3543920541-77">)</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·101,·SHA:·482333891aa72f0754cce08b4017f8668ac598179a83672b59d069bf57571299·...·]-64">]</span><span·class="w">
631 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="3790573059-78">(</span><span·class="n">DnsRr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3790573059-78">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·471,·SHA:·5310e6a86d4a5918b70ed572fc7b3d2eda86f5d3dc368c5e3d7fecddc2207cc7·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">msg</span><span·class="p">;</span><span·class="w">631 ····</span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">rr</span><span·class="p"·data-group-id="3543920541-78">(</span><span·class="n">DnsRr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Field</span><span·class="p"·data-group-id="3543920541-78">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·471,·SHA:·a1814c03e2007cbc20caabf73f073f1be80ec01423be54aec862fd400854df9b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">msg</span><span·class="p">;</span><span·class="w">
632 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="9398886794-3">(</span><span·class="nf">dns_header</span><span·class="p"·data-group-id="9398886794-4">(</span><span·class="p"·data-group-id="9398886794-4">)</span><span·class="p"·data-group-id="9398886794-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">header</span><span·class="p">;</span><span·class="w">632 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="2889238261-3">(</span><span·class="nf">dns_header</span><span·class="p"·data-group-id="2889238261-4">(</span><span·class="p"·data-group-id="2889238261-4">)</span><span·class="p"·data-group-id="2889238261-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">header</span><span·class="p">;</span><span·class="w">
633 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="9398886794-5">(</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="9398886794-6">(</span><span·class="p"·data-group-id="9398886794-6">)</span><span·class="p"·data-group-id="9398886794-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">dns_query</span><span·class="p">;</span><span·class="w">633 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="2889238261-5">(</span><span·class="nf">dns_query</span><span·class="p"·data-group-id="2889238261-6">(</span><span·class="p"·data-group-id="2889238261-6">)</span><span·class="p"·data-group-id="2889238261-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">dns_query</span><span·class="p">;</span><span·class="w">
634 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="9398886794-7">(</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="9398886794-8">(</span><span·class="p"·data-group-id="9398886794-8">)</span><span·class="p"·data-group-id="9398886794-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">rr</span><span·class="p">;</span><span·class="w">634 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="2889238261-7">(</span><span·class="nf">dns_rr</span><span·class="p"·data-group-id="2889238261-8">(</span><span·class="p"·data-group-id="2889238261-8">)</span><span·class="p"·data-group-id="2889238261-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">rr</span><span·class="p">;</span><span·class="w">
635 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="9398886794-9">(</span><span·class="p">_</span><span·class="p"·data-group-id="9398886794-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">.</span></code></pre><p>So,·<code·class="inline">inet_dns:(inet_dns:record_type(X))(X)</code>·converts·any·of·these·data635 </span><span·class="nc">inet_dns</span><span·class="p">:</span><span·class="nf">record_type</span><span·class="p"·data-group-id="2889238261-9">(</span><span·class="p">_</span><span·class="p"·data-group-id="2889238261-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">.</span></code></pre><p>So,·<code·class="inline">inet_dns:(inet_dns:record_type(X))(X)</code>·converts·any·of·these·data
636 structures·into·a·<code·class="inline">{Field,Value}</code>·list.</p>636 structures·into·a·<code·class="inline">{Field,Value}</code>·list.</p>
637 ··</section>637 ··</section>
638 </section>638 </section>
639 <section·class="detail"·id="t:dns_name/0">639 <section·class="detail"·id="t:dns_name/0">
  
640 ··<div·class="detail-header">640 ··<div·class="detail-header">
641 ····<a·href="#t:dns_name/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">641 ····<a·href="#t:dns_name/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">
Offset 1456, 15 lines modifiedOffset 1456, 15 lines modified
1456 ······<p·class="built-using">1456 ······<p·class="built-using">
1457 ········Built·using1457 ········Built·using
1458 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1458 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1459 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1459 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1460 ······</p>1460 ······</p>
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126 ··</h1>126 ··</h1>
  
  
127 ····<section·id="moduledoc">127 ····<section·id="moduledoc">
128 <p>API·module·for·Logger,·the·standard·logging·facility·in·Erlang/OTP.</p><p>This·module·implements·the·main·API·for·logging·in·Erlang/OTP.·To·create·a·log128 <p>API·module·for·Logger,·the·standard·logging·facility·in·Erlang/OTP.</p><p>This·module·implements·the·main·API·for·logging·in·Erlang/OTP.·To·create·a·log
129 event,·use·the·<a·href="#logging-api-functions">API·functions</a>·or·the·log129 event,·use·the·<a·href="#logging-api-functions">API·functions</a>·or·the·log
130 <a·href="#module-macros">macros</a>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">LOG_ERROR</span><span·class="p"·data-group-id="2600695139-1">(</span><span·class="s">&quot;error·happened·because:·</span><span·class="si">~p</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2600695139-2">[</span><span·class="n">Reason</s[·...·truncated·by·diffoscope;·len:·98,·SHA:·c0657ec9ceae938c7331c550c1baf749008989601da569a12004a66b8624f3cb·...·]-1">)</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·With·macro</span><span·class="w">130 <a·href="#module-macros">macros</a>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">LOG_ERROR</span><span·class="p"·data-group-id="6275568352-1">(</span><span·class="s">&quot;error·happened·because:·</span><span·class="si">~p</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6275568352-2">[</span><span·class="n">Reason</s[·...·truncated·by·diffoscope;·len:·98,·SHA:·66599866ed020d3daadc65be7d9a136027a53d32ae4d334f5faa91ce550d5b69·...·]-1">)</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·With·macro</span><span·class="w">
131 </span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="2600695139-3">(</span><span·class="s">&quot;error·happened·because:·</span><span·class="si">~p</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2600695139-4">[</span><span·class="n">Reason</s[·...·truncated·by·diffoscope;·len:·98,·SHA:·3e17a1604ae51f96437a80352d232de7d2cf76b6c575347850871a15b71ba623·...·]-3">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Without·macro</span></code></pre><p>To·configure·the·Logger·backend,·use131 </span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="6275568352-3">(</span><span·class="s">&quot;error·happened·because:·</span><span·class="si">~p</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6275568352-4">[</span><span·class="n">Reason</s[·...·truncated·by·diffoscope;·len:·98,·SHA:·788fe581e75073c68a1887ee4cec2c57a49cdcaefde8b4214914a23e04052fba·...·]-3">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Without·macro</span></code></pre><p>To·configure·the·Logger·backend,·use
132 <a·href="kernel_app.html#logger">Kernel·configuration·parameters</a>·or132 <a·href="kernel_app.html#logger">Kernel·configuration·parameters</a>·or
133 <a·href="#configuration-api-functions">configuration·functions</a>·in·the·Logger·API.</p><p>By·default,·the·Kernel·application·installs·one·log·handler·at·system·start.133 <a·href="#configuration-api-functions">configuration·functions</a>·in·the·Logger·API.</p><p>By·default,·the·Kernel·application·installs·one·log·handler·at·system·start.
134 This·handler·is·named·<code·class="inline">default</code>.·It·receives·and·processes·standard·log·events134 This·handler·is·named·<code·class="inline">default</code>.·It·receives·and·processes·standard·log·events
135 produced·by·the·Erlang·runtime·system,·standard·behaviours·and·different135 produced·by·the·Erlang·runtime·system,·standard·behaviours·and·different
136 Erlang/OTP·applications.·The·log·events·are·by·default·printed·to·the·terminal.</p><p>If·you·want·your·systems·logs·to·be·printed·to·a·file·instead,·you·must136 Erlang/OTP·applications.·The·log·events·are·by·default·printed·to·the·terminal.</p><p>If·you·want·your·systems·logs·to·be·printed·to·a·file·instead,·you·must
137 configure·the·default·handler·to·do·so.·The·simplest·way·is·to·include·the137 configure·the·default·handler·to·do·so.·The·simplest·way·is·to·include·the
138 following·in·your·<a·href="config.html"><code·class="inline">sys.config</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6878988864-1">[</span><span·class="p"·data-group-id="6878988864-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">138 following·in·your·<a·href="config.html"><code·class="inline">sys.config</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9315389199-1">[</span><span·class="p"·data-group-id="9315389199-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
139 ··</span><span·class="p"·data-group-id="6878988864-3">[</span><span·class="p"·data-group-id="6878988864-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">139 ··</span><span·class="p"·data-group-id="9315389199-3">[</span><span·class="p"·data-group-id="9315389199-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
140 ····</span><span·class="p"·data-group-id="6878988864-5">[</span><span·class="p"·data-group-id="6878988864-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">140 ····</span><span·class="p"·data-group-id="9315389199-5">[</span><span·class="p"·data-group-id="9315389199-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
141 ······</span><span·class="p"·data-group-id="6878988864-7">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6878988864-8">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;[·...·truncated·by·diffoscope;·len:·494,·SHA:·a465df47b1cea55e3190b100bdc821c92d5d3ca8d49d8aff8a957699672a050a·...·]-1">]</span><span·class="p">.</span></code></pre><p>For·more·information·about:</p><ul><li>the·Logger·facility·in·general,·see·the·<a·href="logger_chapter.html">User's·Guide</a>.</li><li>how·to·configure·Logger,·see·the141 ······</span><span·class="p"·data-group-id="9315389199-7">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9315389199-8">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;[·...·truncated·by·diffoscope;·len:·494,·SHA:·b63d965819792f6bcf4d1f4c1b35620b67cfc925112eddd264d0725a52281600·...·]-1">]</span><span·class="p">.</span></code></pre><p>For·more·information·about:</p><ul><li>the·Logger·facility·in·general,·see·the·<a·href="logger_chapter.html">User's·Guide</a>.</li><li>how·to·configure·Logger,·see·the
142 <a·href="logger_chapter.html#configuration">Configuration</a>·section·in·the·User's·Guide.</li><li>the·built-in·handlers,·see·<a·href="logger_std_h.html"><code·class="inline">logger_std_h</code></a>·and·<a·href="logger_disk_log_h.html"><code·class="inline">logger_disk_log_h</code></a>.</li><li>the·built-in·formatter,·see·<a·href="logger_formatter.html"><code·class="inline">logger_formatter</code></a>.</li><li>built-in·filters,·see·<a·href="logger_filters.html"><code·class="inline">logger_filters</code></a>.</li></ul><h2·id="module-macros"·class="section-heading">142 <a·href="logger_chapter.html#configuration">Configuration</a>·section·in·the·User's·Guide.</li><li>the·built-in·handlers,·see·<a·href="logger_std_h.html"><code·class="inline">logger_std_h</code></a>·and·<a·href="logger_disk_log_h.html"><code·class="inline">logger_disk_log_h</code></a>.</li><li>the·built-in·formatter,·see·<a·href="logger_formatter.html"><code·class="inline">logger_formatter</code></a>.</li><li>built-in·filters,·see·<a·href="logger_filters.html"><code·class="inline">logger_filters</code></a>.</li></ul><h2·id="module-macros"·class="section-heading">
143 ··<a·href="#module-macros"·class="hover-link">143 ··<a·href="#module-macros"·class="hover-link">
144 ····<i·class="ri-link-m"·aria-hidden="true"></i>144 ····<i·class="ri-link-m"·aria-hidden="true"></i>
145 ··</a>145 ··</a>
146 ··<span·class="text">Macros</span>146 ··<span·class="text">Macros</span>
147 </h2>147 </h2>
148 <p>The·following·macros·are·defined·in·<code·class="inline">logger.hrl</code>,·which·is·included·in·a·module148 <p>The·following·macros·are·defined·in·<code·class="inline">logger.hrl</code>,·which·is·included·in·a·module
149 with·the·directive</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7581977152-1">(</span><span·class="s">&quot;kernel/include/logger.hrl&quot;</span><span·class="p"·data-group-id="7581977152-1">)</span><span·class="p">.</span></code></pre><ul><li><code·class="inline">?LOG_EMERGENCY(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_EMERGENCY(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_ALERT(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_ALERT(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_CRITICAL(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_CRITICAL(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_ERROR(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_ERROR(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_WARNING(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_WARNING(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_NOTICE(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_NOTICE(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_INFO(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_INFO(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_DEBUG(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_DEBUG(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG(Level,StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG(Level,FunOrFormat,Args[,Metadata])</code></li></ul><p>All·macros·expand·to·a·call·to·Logger,·where·<code·class="inline">Level</code>·is·taken·from·the·macro149 with·the·directive</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8171974904-1">(</span><span·class="s">&quot;kernel/include/logger.hrl&quot;</span><span·class="p"·data-group-id="8171974904-1">)</span><span·class="p">.</span></code></pre><ul><li><code·class="inline">?LOG_EMERGENCY(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_EMERGENCY(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_ALERT(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_ALERT(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_CRITICAL(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_CRITICAL(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_ERROR(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_ERROR(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_WARNING(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_WARNING(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_NOTICE(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_NOTICE(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_INFO(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_INFO(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG_DEBUG(StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG_DEBUG(FunOrFormat,Args[,Metadata])</code></li><li><code·class="inline">?LOG(Level,StringOrReport[,Metadata])</code></li><li><code·class="inline">?LOG(Level,FunOrFormat,Args[,Metadata])</code></li></ul><p>All·macros·expand·to·a·call·to·Logger,·where·<code·class="inline">Level</code>·is·taken·from·the·macro
150 name,·or·from·the·first·argument·in·the·case·of·the·<code·class="inline">?LOG</code>·macro.·Location·data150 name,·or·from·the·first·argument·in·the·case·of·the·<code·class="inline">?LOG</code>·macro.·Location·data
151 is·added·to·the·metadata·as·described·under·the·<a·href="#t:metadata/0"><code·class="inline">metadata/0</code></a>·type·definition.</p><p>The·call·is·wrapped·in·a·case·statement·and·will·be·evaluated·only·if·<code·class="inline">Level</code>·is151 is·added·to·the·metadata·as·described·under·the·<a·href="#t:metadata/0"><code·class="inline">metadata/0</code></a>·type·definition.</p><p>The·call·is·wrapped·in·a·case·statement·and·will·be·evaluated·only·if·<code·class="inline">Level</code>·is
152 equal·to·or·below·the·configured·log·level.</p><h2·id="module-see-also"·class="section-heading">152 equal·to·or·below·the·configured·log·level.</p><h2·id="module-see-also"·class="section-heading">
153 ··<a·href="#module-see-also"·class="hover-link">153 ··<a·href="#module-see-also"·class="hover-link">
154 ····<i·class="ri-link-m"·aria-hidden="true"></i>154 ····<i·class="ri-link-m"·aria-hidden="true"></i>
155 ··</a>155 ··</a>
156 ··<span·class="text">See·Also</span>156 ··<span·class="text">See·Also</span>
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2304 ·········(Level·::·<a·href="#t:level/0">level</a>(),·Fun·::·<a·href="#t:msg_fun/0">msg_fun</a>(),·FunArgs·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·ok.</pre>2304 ·········(Level·::·<a·href="#t:level/0">level</a>(),·Fun·::·<a·href="#t:msg_fun/0">msg_fun</a>(),·FunArgs·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·ok.</pre>
  
2305 ······</div>2305 ······</div>
  
2306 <p>Create·a·log·event·at·the·given·<a·href="logger_chapter.html#log-level">log·level</a>,·with2306 <p>Create·a·log·event·at·the·given·<a·href="logger_chapter.html#log-level">log·level</a>,·with
2307 the·given·<a·href="logger_chapter.html#log-message">message</a>·to·be·logged·and2307 the·given·<a·href="logger_chapter.html#log-message">message</a>·to·be·logged·and
2308 <a·href="logger_chapter.html#metadata"><em>metadata</em></a>.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·A·plain·string</span><span·class="gp·unselectable">2308 <a·href="logger_chapter.html#metadata"><em>metadata</em></a>.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·A·plain·string</span><span·class="gp·unselectable">
2309 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3984169106-1">(</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Hello·World&quot;</span><span·class="p"·data-group-id="3984169106-1">)</span><span·class="p">.</span><span·class="w">2309 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3412424525-1">(</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Hello·World&quot;</span><span·class="p"·data-group-id="3412424525-1">)</span><span·class="p">.</span><span·class="w">
2310 </span><span·class="c1">%%·A·plain·string·with·metadata</span><span·class="gp·unselectable">2310 </span><span·class="c1">%%·A·plain·string·with·metadata</span><span·class="gp·unselectable">
2311 2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3984169106-2">(</span><span·class="ss">debug</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Hello·World&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3984169106-3">#{</span><span·clas[·...·truncated·by·diffoscope;·len:·264,·SHA:·88ef4e13974db0b2fc02718709751eeff2ce21449e85b3f3d830b1e265f841b4·...·]-2">)</span><span·class="p">.</span><span·class="w">2311 2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3412424525-2">(</span><span·class="ss">debug</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Hello·World&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3412424525-3">#{</span><span·clas[·...·truncated·by·diffoscope;·len:·264,·SHA:·e05c44a62f1ef10f34307f871114a08c22825fa69e0f83d06941321fe0ce1895·...·]-2">)</span><span·class="p">.</span><span·class="w">
2312 </span><span·class="c1">%%·A·format·string·with·arguments</span><span·class="gp·unselectable">2312 </span><span·class="c1">%%·A·format·string·with·arguments</span><span·class="gp·unselectable">
2313 3&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3984169106-4">(</span><span·class="ss">warning</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;The·roof·is·on·~ts&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="3984169106-5">[</span><span·class="n">Cause</spa[·...·truncated·by·diffoscope;·len:·96,·SHA:·65a05e10046a5ca98587c8f7fb4e9c9e5a9e3dc8af5c7105cab9f4e24b67467a·...·]-4">)</span><span·class="p">.</span><span·class="w">2313 3&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3412424525-4">(</span><span·class="ss">warning</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;The·roof·is·on·~ts&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="3412424525-5">[</span><span·class="n">Cause</spa[·...·truncated·by·diffoscope;·len:·96,·SHA:·85d6a961fe0be240a01445bc0b214528d18113b0b696496f145b4b4541d0ea90·...·]-4">)</span><span·class="p">.</span><span·class="w">
2314 </span><span·class="c1">%%·A·report</span><span·class="gp·unselectable">2314 </span><span·class="c1">%%·A·report</span><span·class="gp·unselectable">
2315 4&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3984169106-6">(</span><span·class="ss">warning</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3984169106-7">#{</span><span·class="w">·</span><span·class="ss">what</span><span·class="w">·</span><span·class="p">=&gt;</spa[·...·truncated·by·diffoscope;·len:·353,·SHA:·068d4507ae64f852d0d766c1acb682e334c70129754e88cb8628b97e09ce4be0·...·]-6">)</span><span·class="p">.</span></code></pre><p>Equivalent·to·<a·href="#log/4"><code·class="inline">log(Level,·FormatOrFun,·Args,·#{})</code></a>·if·called·as2315 4&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="3412424525-6">(</span><span·class="ss">warning</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3412424525-7">#{</span><span·class="w">·</span><span·class="ss">what</span><span·class="w">·</span><span·class="p">=&gt;</spa[·...·truncated·by·diffoscope;·len:·353,·SHA:·df78735e25b3e21902b84b10d0f9ae4fb305876dd625979aa23790285552ae54·...·]-6">)</span><span·class="p">.</span></code></pre><p>Equivalent·to·<a·href="#log/4"><code·class="inline">log(Level,·FormatOrFun,·Args,·#{})</code></a>·if·called·as
2316 <code·class="inline">log(Level,·FormatOrFun,·Args)</code>.</p>2316 <code·class="inline">log(Level,·FormatOrFun,·Args)</code>.</p>
2317 ··</section>2317 ··</section>
2318 </section>2318 </section>
2319 <section·class="detail"·id="log/4">2319 <section·class="detail"·id="log/4">
  
2320 ··<div·class="detail-header">2320 ··<div·class="detail-header">
2321 ····<a·href="#log/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2321 ····<a·href="#log/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2347, 20 lines modifiedOffset 2347, 20 lines modified
2347 <p>Create·a·log·event·at·the·given·<a·href="logger_chapter.html#log-level">log·level</a>,·with2347 <p>Create·a·log·event·at·the·given·<a·href="logger_chapter.html#log-level">log·level</a>,·with
2348 the·given·<a·href="logger_chapter.html#log-message">message</a>·to·be·logged·and2348 the·given·<a·href="logger_chapter.html#log-message">message</a>·to·be·logged·and
2349 <a·href="logger_chapter.html#metadata"><em>metadata</em></a>.</p><p>The·message·and·metadata·can·either·be·given·directly·in·the·arguments,·or2349 <a·href="logger_chapter.html#metadata"><em>metadata</em></a>.</p><p>The·message·and·metadata·can·either·be·given·directly·in·the·arguments,·or
2350 returned·from·a·fun.·Passing·a·fun·instead·of·the·message/metadata·directly·is2350 returned·from·a·fun.·Passing·a·fun·instead·of·the·message/metadata·directly·is
2351 useful·in·scenarios·when·the·message/metadata·is·very·expensive·to·compute.·This2351 useful·in·scenarios·when·the·message/metadata·is·very·expensive·to·compute.·This
2352 is·because·the·fun·is·only·evaluated·when·the·message/metadata·is·actually2352 is·because·the·fun·is·only·evaluated·when·the·message/metadata·is·actually
2353 needed,·which·may·be·not·at·all·if·the·log·event·is·not·to·be·logged.·Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·A·plain·string·with·expensive·metadata</span><span·class="gp·unselectable">2353 needed,·which·may·be·not·at·all·if·the·log·event·is·not·to·be·logged.·Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·A·plain·string·with·expensive·metadata</span><span·class="gp·unselectable">
2354 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="3849220757-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3849220757-2">(</span><span·class="p"·data-group-id="3849220757-3">[</span><span·class="p"·data-group-id="3849220757-3">]</span><span·class="p"·data-group-id="3849220757-2">)</[·...·truncated·by·diffoscope;·len:·900,·SHA:·d2f789c13770098c09bd6f1b3ac86096fbb737b306b234b42b20cbf1d353712e·...·]-1">)</span><span·class="p">.</span><span·class="w">2354 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="4985463420-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4985463420-2">(</span><span·class="p"·data-group-id="4985463420-3">[</span><span·class="p"·data-group-id="4985463420-3">]</span><span·class="p"·data-group-id="4985463420-2">)</[·...·truncated·by·diffoscope;·len:·900,·SHA:·a392b362abf50690e8872f301be15bc3a1646de08575dd2d862c34168e7a604a·...·]-1">)</span><span·class="p">.</span><span·class="w">
2355 </span><span·class="c1">%%·An·expensive·report</span><span·class="gp·unselectable">2355 </span><span·class="c1">%%·An·expensive·report</span><span·class="gp·unselectable">
2356 2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">debug</span><span·class="p"·data-group-id="3849220757-8">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3849220757-9">(</span><span·class="n">What</span><span·class="p"·data-group-id="3849220757-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·727,·SHA:·1b68188bdf8d9b29b1c2b6243170c752f2b75946eb89611f016e1f846d2f1ce3·...·]-8">)</span><span·class="p">.</span><span·class="w">2356 2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">debug</span><span·class="p"·data-group-id="4985463420-8">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4985463420-9">(</span><span·class="n">What</span><span·class="p"·data-group-id="4985463420-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·727,·SHA:·4966711b61c8d39d5717cd30b6225a3259d36e4d7a5dd42eeae68e032cec6631·...·]-8">)</span><span·class="p">.</span><span·class="w">
2357 </span><span·class="c1">%%·A·plain·string·with·expensive·metadata·and·normal·metadata</span><span·class="gp·unselectable">2357 </span><span·class="c1">%%·A·plain·string·with·expensive·metadata·and·normal·metadata</span><span·class="gp·unselectable">
2358 3&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">debug</span><span·class="p"·data-group-id="3849220757-12">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3849220757-13">(</span><span·class="p"·data-group-id="3849220757-14">[</span><span·class="p"·data-group-id="3849220757-14">]</span><span·class="p"·data-group-id="3849220757-13[·...·truncated·by·diffoscope;·len:·859,·SHA:·2b4bd03ea43b3f886ae53e1ecb85ae470aaa3dca724fa1f35074f5f9c504c76e·...·]-18">]</span><span·class="p">,</span><span·class="w">2358 3&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">debug</span><span·class="p"·data-group-id="4985463420-12">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4985463420-13">(</span><span·class="p"·data-group-id="4985463420-14">[</span><span·class="p"·data-group-id="4985463420-14">]</span><span·class="p"·data-group-id="4985463420-13[·...·truncated·by·diffoscope;·len:·859,·SHA:·66f265cdcb7ba56b2568da867b71b2e1dd2375c4d9087008bda63c7e953488b9·...·]-18">]</span><span·class="p">,</span><span·class="w">
2359 ···············</span><span·class="p"·data-group-id="3849220757-19">#{</span><span·class="w">·</span><span·class="ss">meta</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">data</span><span·class="w">·</span><span·class="p"·data-group-id="3849220757-19">}</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·dd15ec7f13d652ebdef0c8b0f7e84692dc390dc555b690a76c18bbc37bbfd031·...·]-12">)</span><span·class="p">.</span></code></pre><p>When·metadata·is·given·both·as·an·argument·and·returned·from·the·fun·they·are2359 ···············</span><span·class="p"·data-group-id="4985463420-19">#{</span><span·class="w">·</span><span·class="ss">meta</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">data</span><span·class="w">·</span><span·class="p"·data-group-id="4985463420-19">}</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·277a99cd6e4f3441164bfb91eef636cfd59d0904e049e423c52e5a019fd9d0c5·...·]-12">)</span><span·class="p">.</span></code></pre><p>When·metadata·is·given·both·as·an·argument·and·returned·from·the·fun·they·are
2360 merged.·If·equal·keys·exists·the·values·are·taken·from·the·metadata·returned·by2360 merged.·If·equal·keys·exists·the·values·are·taken·from·the·metadata·returned·by
2361 the·fun.</p>2361 the·fun.</p>
2362 ··</section>2362 ··</section>
2363 </section>2363 </section>
2364 <section·class="detail"·id="notice/1">2364 <section·class="detail"·id="notice/1">
  
2365 ··<div·class="detail-header">2365 ··<div·class="detail-header">
Offset 2657, 34 lines modifiedOffset 2657, 34 lines modified
2657 ······</div>2657 ······</div>
  
2658 <p>Reads·the·application·configuration·parameter·<code·class="inline">logger</code>·and·calls2658 <p>Reads·the·application·configuration·parameter·<code·class="inline">logger</code>·and·calls
2659 <a·href="#add_handlers/1"><code·class="inline">add_handlers/1</code></a>·with·its·contents.</p><p>This·function·should·be·used·by·custom·Logger·handlers·to·make·configuration2659 <a·href="#add_handlers/1"><code·class="inline">add_handlers/1</code></a>·with·its·contents.</p><p>This·function·should·be·used·by·custom·Logger·handlers·to·make·configuration
2660 consistent·no·matter·which·handler·the·system·uses.·Normal·usage·is·to·add·a2660 consistent·no·matter·which·handler·the·system·uses.·Normal·usage·is·to·add·a
2661 call·to·<a·href="#add_handlers/1"><code·class="inline">logger:add_handlers/1</code></a>·just·after·the·processes·that·the·handler·needs2661 call·to·<a·href="#add_handlers/1"><code·class="inline">logger:add_handlers/1</code></a>·just·after·the·processes·that·the·handler·needs
2662 are·started,·and·pass·the·application's·<code·class="inline">logger</code>·configuration·as·the·argument.2662 are·started,·and·pass·the·application's·<code·class="inline">logger</code>·configuration·as·the·argument.
2663 For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="2977210629-1">(</span><span·class="ss">application</span><span·class="p"·data-group-id="2977210629-1">)</span><span·class="p">.</span><span·class="w">2663 For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="5557890741-1">(</span><span·class="ss">application</span><span·class="p"·data-group-id="5557890741-1">)</span><span·class="p">.</span><span·class="w">
2664 </span><span·class="nf">start</span><span·class="p"·data-group-id="2977210629-2">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2977210629-3">[</span><span·class="p"·data-group-id="2977210629-3">]</span><span·class="p"·data-group-id="2977210629-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">2664 </span><span·class="nf">start</span><span·class="p"·data-group-id="5557890741-2">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5557890741-3">[</span><span·class="p"·data-group-id="5557890741-3">]</span><span·class="p"·data-group-id="5557890741-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
2665 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="2977210629-4">(</span><span·class="p"·data-group-id="2977210629-5">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_sup</span><span·class="p"·data-group-id="2977210629-5">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·252,·SHA:·be228bc645acb0bcb7b0eafb1214a5936a75f2fed3fc6ab6bd6ea7c52b30b314·...·]-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">2665 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">supervisor</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="5557890741-4">(</span><span·class="p"·data-group-id="5557890741-5">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_sup</span><span·class="p"·data-group-id="5557890741-5">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·252,·SHA:·ab53f5ac6126cab0e5581291d061f876047d39f34a5e6833531e6d33fd6f0c21·...·]-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
2666 ········</span><span·class="p"·data-group-id="2977210629-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="2977210629-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">2666 ········</span><span·class="p"·data-group-id="5557890741-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="5557890741-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
2667 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handlers</span><span·class="p"·data-group-id="2977210629-8">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="2977210629-8">)</span><span·class="p">,</span><span·class="w">2667 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handlers</span><span·class="p"·data-group-id="5557890741-8">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="5557890741-8">)</span><span·class="p">,</span><span·class="w">
2668 ············</span><span·class="p"·data-group-id="2977210629-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2977210629-10">[</span><span·class="p"·data-group-id="2[·...·truncated·by·diffoscope;·len:·63,·SHA:·73afd4cfa48dbf5864152c8e69e128ab9f32046fae6db77e378875c797c6a39d·...·]-9">}</span><span·class="p">;</span><span·class="w">2668 ············</span><span·class="p"·data-group-id="5557890741-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5557890741-10">[</span><span·class="p"·data-group-id="5[·...·truncated·by·diffoscope;·len:·63,·SHA:·10a2a01076bee7dcd4a78732ea1328149e080c638f0f5b3ae0909b29f1ccaa02·...·]-9">}</span><span·class="p">;</span><span·class="w">
2669 ········</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Error</span><span·class="w">2669 ········</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Error</span><span·class="w">
2670 ·····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>This·reads·the·<code·class="inline">logger</code>·configuration·parameter·from·the·<code·class="inline">my_app</code>·application2670 ·····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>This·reads·the·<code·class="inline">logger</code>·configuration·parameter·from·the·<code·class="inline">my_app</code>·application
2671 and·starts·the·configured·handlers.·The·contents·of·the·configuration·use·the2671 and·starts·the·configured·handlers.·The·contents·of·the·configuration·use·the
2672 same·rules·as·the2672 same·rules·as·the
2673 <a·href="logger_chapter.html#handler-configuration">logger·handler·configuration</a>.</p><p>If·the·handler·is·meant·to·replace·the·default·handler,·the·Kernel's·default2673 <a·href="logger_chapter.html#handler-configuration">logger·handler·configuration</a>.</p><p>If·the·handler·is·meant·to·replace·the·default·handler,·the·Kernel's·default
2674 handler·have·to·be·disabled·before·the·new·handler·is·added.·A·<code·class="inline">sys.config</code>·file2674 handler·have·to·be·disabled·before·the·new·handler·is·added.·A·<code·class="inline">sys.config</code>·file
2675 that·disables·the·Kernel·handler·and·adds·a·custom·handler·could·look·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1428936965-1">[</span><span·class="p"·data-group-id="1428936965-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">2675 that·disables·the·Kernel·handler·and·adds·a·custom·handler·could·look·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4350735675-1">[</span><span·class="p"·data-group-id="4350735675-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
2676 ··</span><span·class="p"·data-group-id="1428936965-3">[</span><span·class="p"·data-group-id="1428936965-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">2676 ··</span><span·class="p"·data-group-id="4350735675-3">[</span><span·class="p"·data-group-id="4350735675-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
2677 ····</span><span·class="c1">%%·Disable·the·default·Kernel·handler</span><span·class="w">2677 ····</span><span·class="c1">%%·Disable·the·default·Kernel·handler</span><span·class="w">
2678 ····</span><span·class="p"·data-group-id="1428936965-5">[</span><span·class="p"·data-group-id="1428936965-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefi[·...·truncated·by·diffoscope;·len:·262,·SHA:·2ae497f1c0a4da578050eaa5bfb63fb1738f3a1229a20a5ae2d0dfd97793d111·...·]5-2">}</span><span·class="p">,</span><span·class="w">2678 ····</span><span·class="p"·data-group-id="4350735675-5">[</span><span·class="p"·data-group-id="4350735675-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefi[·...·truncated·by·diffoscope;·len:·262,·SHA:·818f0b165c94bc336287595566711f344af7ed04055e224269c4aa1bc9cc7b40·...·]5-2">}</span><span·class="p">,</span><span·class="w">
2679 ·</span><span·class="p"·data-group-id="1428936965-7">{</span><span·class="ss">my_app</span><span·class="p">,</span><span·class="w">2679 ·</span><span·class="p"·data-group-id="4350735675-7">{</span><span·class="ss">my_app</span><span·class="p">,</span><span·class="w">
2680 ··</span><span·class="p"·data-group-id="1428936965-8">[</span><span·class="p"·data-group-id="1428936965-9">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">2680 ··</span><span·class="p"·data-group-id="4350735675-8">[</span><span·class="p"·data-group-id="4350735675-9">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
2681 ····</span><span·class="c1">%%·Enable·this·handler·as·the·default</span><span·class="w">2681 ····</span><span·class="c1">%%·Enable·this·handler·as·the·default</span><span·class="w">
2682 ····</span><span·class="p"·data-group-id="1428936965-10">[</span><span·class="p"·data-group-id="1428936965-11">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_h[·...·truncated·by·diffoscope;·len:·477,·SHA:·912fc2ea35bccdf27108d92137b9272a1df0e0d4267c6f0b66e9551a90be6a44·...·]5-1">]</span><span·class="p">.</span></code></pre>2682 ····</span><span·class="p"·data-group-id="4350735675-10">[</span><span·class="p"·data-group-id="4350735675-11">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_h[·...·truncated·by·diffoscope;·len:·477,·SHA:·bf49f913ca3d63cdbd7eb1bf9886f9d0ed7efd095c243350fce3da40004b46d9·...·]5-1">]</span><span·class="p">.</span></code></pre>
2683 ··</section>2683 ··</section>
2684 </section>2684 </section>
2685 <section·class="detail"·id="add_primary_filter/2">2685 <section·class="detail"·id="add_primary_filter/2">
  
2686 ··<div·class="detail-header">2686 ··<div·class="detail-header">
2687 ····<a·href="#add_primary_filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2687 ····<a·href="#add_primary_filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
2688 ······<i·class="ri-link-m"·aria-hidden="true"></i>2688 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 3575, 16 lines modifiedOffset 3575, 16 lines modified
3575 ··········<pre·translate="no"><span·class="attribute">-spec</span>·update_formatter_config(HandlerId,·FormatterConfig)·->·ok·|·{error,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()}3575 ··········<pre·translate="no"><span·class="attribute">-spec</span>·update_formatter_config(HandlerId,·FormatterConfig)·->·ok·|·{error,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()}
3576 ·································when3576 ·································when
3577 ·····································HandlerId·::·<a·href="logger_handler.html#t:id/0">logger_handler:id</a>(),3577 ·····································HandlerId·::·<a·href="logger_handler.html#t:id/0">logger_handler:id</a>(),
3578 ·····································FormatterConfig·::·<a·href="#t:formatter_config/0">formatter_config</a>().</pre>3578 ·····································FormatterConfig·::·<a·href="#t:formatter_config/0">formatter_config</a>().</pre>
  
3579 ······</div>3579 ······</div>
  
3580 <p>Update·the·formatter·configuration·for·the·specified·handler.</p><p>The·new·configuration·is·merged·with·the·existing·formatter·configuration.</p><p>To·overwrite·the·existing·configuration·without·any·merge,·use</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="0499261759-1">(</span><span·class="n">HandlerId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="p">,</span><span·class="w">3580 <p>Update·the·formatter·configuration·for·the·specified·handler.</p><p>The·new·configuration·is·merged·with·the·existing·formatter·configuration.</p><p>To·overwrite·the·existing·configuration·without·any·merge,·use</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="0599537212-1">(</span><span·class="n">HandlerId</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="p">,</span><span·class="w">
3581 »       ······</span><span·class="p"·data-group-id="0499261759-2">{</span><span·class="n">FormatterModule</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FormatterConfig</span><span·class="p"·data-group-id="0499261759-2">}</span><span·class="p"·data-group-id="0499261759-1">)</span><span·class="p">.</span></code></pre>3581 »       ······</span><span·class="p"·data-group-id="0599537212-2">{</span><span·class="n">FormatterModule</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FormatterConfig</span><span·class="p"·data-group-id="0599537212-2">}</span><span·class="p"·data-group-id="0599537212-1">)</span><span·class="p">.</span></code></pre>
3582 ··</section>3582 ··</section>
3583 </section>3583 </section>
3584 <section·class="detail"·id="update_formatter_config/3">3584 <section·class="detail"·id="update_formatter_config/3">
  
3585 ··<div·class="detail-header">3585 ··<div·class="detail-header">
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186 ····<i·class="ri-link-m"·aria-hidden="true"></i>186 ····<i·class="ri-link-m"·aria-hidden="true"></i>
187 ··</a>187 ··</a>
188 ··<span·class="text">Logger·API</span>188 ··<span·class="text">Logger·API</span>
189 </h2>189 </h2>
190 <p>The·API·for·logging·consists·of·a·set·of·<a·href="logger.html#module-macros">macros</a>,·and·a·set190 <p>The·API·for·logging·consists·of·a·set·of·<a·href="logger.html#module-macros">macros</a>,·and·a·set
191 of·functions·on·the·form·<code·class="inline">logger:Level/1,2,3</code>,·which·are·all·shortcuts·for191 of·functions·on·the·form·<code·class="inline">logger:Level/1,2,3</code>,·which·are·all·shortcuts·for
192 <a·href="logger.html#log/2"><code·class="inline">logger:log(Level,Arg1[,Arg2[,Arg3]])</code></a>.</p><p>The·macros·are·defined·in·<code·class="inline">logger.hrl</code>,·which·is·included·in·a·module·with·the192 <a·href="logger.html#log/2"><code·class="inline">logger:log(Level,Arg1[,Arg2[,Arg3]])</code></a>.</p><p>The·macros·are·defined·in·<code·class="inline">logger.hrl</code>,·which·is·included·in·a·module·with·the
193 directive</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6249051713-1">(</span><span·class="s">&quot;kernel/include/logger.hrl&quot;</span><span·class="p"·data-group-id="6249051713-1">)</span><span·class="p">.</span></code></pre><p>The·difference·between·using·the·macros·and·the·exported·functions·is·that193 directive</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9651345494-1">(</span><span·class="s">&quot;kernel/include/logger.hrl&quot;</span><span·class="p"·data-group-id="9651345494-1">)</span><span·class="p">.</span></code></pre><p>The·difference·between·using·the·macros·and·the·exported·functions·is·that
194 macros·add·location·(originator)·information·to·the·metadata,·and·performs·lazy194 macros·add·location·(originator)·information·to·the·metadata,·and·performs·lazy
195 evaluation·by·wrapping·the·logger·call·in·a·case·statement,·so·it·is·only195 evaluation·by·wrapping·the·logger·call·in·a·case·statement,·so·it·is·only
196 evaluated·if·the·log·level·of·the·event·passes·the·primary·log·level·check.</p><h3·id="log-level"·class="section-heading">196 evaluated·if·the·log·level·of·the·event·passes·the·primary·log·level·check.</p><h3·id="log-level"·class="section-heading">
197 ··<a·href="#log-level"·class="hover-link">197 ··<a·href="#log-level"·class="hover-link">
198 ····<i·class="ri-link-m"·aria-hidden="true"></i>198 ····<i·class="ri-link-m"·aria-hidden="true"></i>
199 ··</a>199 ··</a>
200 ··<span·class="text">Log·Level</span>200 ··<span·class="text">Log·Level</span>
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208 ··<a·href="#log-message"·class="hover-link">208 ··<a·href="#log-message"·class="hover-link">
209 ····<i·class="ri-link-m"·aria-hidden="true"></i>209 ····<i·class="ri-link-m"·aria-hidden="true"></i>
210 ··</a>210 ··</a>
211 ··<span·class="text">Log·Message</span>211 ··<span·class="text">Log·Message</span>
212 </h3>212 </h3>
213 <p>The·log·message·contains·the·information·to·be·logged.·The·message·can·consist213 <p>The·log·message·contains·the·information·to·be·logged.·The·message·can·consist
214 of·a·format·string·and·arguments·(given·as·two·separate·parameters·in·the·Logger214 of·a·format·string·and·arguments·(given·as·two·separate·parameters·in·the·Logger
215 API),·a·string·or·a·report.</p><p>Example,·format·string·and·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="1161157867-1">(</span><span·class="s">&quot;The·file·does·not·exist:·~ts&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1161157867-2">[</span><span·class="n">Filename</span><span·class="p"·data-group-id="1161157867-2">]</span><span·clas[·...·truncated·by·diffoscope;·len:·367,·SHA:·03c6afadeeb277d12cea6c82997dfaa296829b2416e2ce2ef478f9236f8a46d1·...·]-1">)</span></code></pre><p>A·report,·which·is·either·a·map·or·a·key-value·list,·is·the·preferred·way·to·log215 API),·a·string·or·a·report.</p><p>Example,·format·string·and·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="4038278246-1">(</span><span·class="s">&quot;The·file·does·not·exist:·~ts&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="4038278246-2">[</span><span·class="n">Filename</span><span·class="p"·data-group-id="4038278246-2">]</span><span·clas[·...·truncated·by·diffoscope;·len:·367,·SHA:·428b12f8087bed9a3789aae18fd06fbcf6c6e84527973e689c733e68c7f29571·...·]-1">)</span></code></pre><p>A·report,·which·is·either·a·map·or·a·key-value·list,·is·the·preferred·way·to·log
216 using·Logger·as·it·makes·it·possible·for·different·backends·to·filter·and·format216 using·Logger·as·it·makes·it·possible·for·different·backends·to·filter·and·format
217 the·log·event·as·it·needs·to.</p><p>Example,·report:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">LOG_ERROR</span><span·class="p"·data-group-id="8320554211-1">(</span><span·class="p"·data-group-id="8320554211-2">#{</span><span·class="w">·</span><span·class="ss">user</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">joe</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·463,·SHA:·2fc73824623c49175d10a2d9c4cfd327e9ce6cb263b21b5d8f2899b4b61ddaf7·...·]-1">)</span></code></pre><p>Reports·can·be·accompanied·by·a·<em>report·callback</em>·specified·in·the·log·event's217 the·log·event·as·it·needs·to.</p><p>Example,·report:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">LOG_ERROR</span><span·class="p"·data-group-id="8552114472-1">(</span><span·class="p"·data-group-id="8552114472-2">#{</span><span·class="w">·</span><span·class="ss">user</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">joe</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·463,·SHA:·69ad4f26b7de9cb394188aa27ab21ca632819fdd185566b0d751d3c21902ffbe·...·]-1">)</span></code></pre><p>Reports·can·be·accompanied·by·a·<em>report·callback</em>·specified·in·the·log·event's
218 <a·href="#metadata">metadata</a>.·The·report·callback·is·a·convenience218 <a·href="#metadata">metadata</a>.·The·report·callback·is·a·convenience
219 function·that·the·<a·href="#formatters">formatter</a>·can·use·to·convert219 function·that·the·<a·href="#formatters">formatter</a>·can·use·to·convert
220 the·report·to·a·format·string·and·arguments,·or·directly·to·a·string.·The220 the·report·to·a·format·string·and·arguments,·or·directly·to·a·string.·The
221 formatter·can·also·use·its·own·conversion·function,·if·no·callback·is·provided,221 formatter·can·also·use·its·own·conversion·function,·if·no·callback·is·provided,
222 or·if·a·customized·formatting·is·desired.</p><p>The·report·callback·must·be·a·fun·with·one·or·two·arguments.·If·it·takes·one222 or·if·a·customized·formatting·is·desired.</p><p>The·report·callback·must·be·a·fun·with·one·or·two·arguments.·If·it·takes·one
223 argument,·this·is·the·report·itself,·and·the·fun·returns·a·format·string·and223 argument,·this·is·the·report·itself,·and·the·fun·returns·a·format·string·and
224 arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0268419442-1">(</span><span·class="p"·data-group-id="0268419442-2">(</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">report</span><span·class="p"·data-group-id="0268419442-3">(</span><span·class="p"·data-group-id="0268419442-3">)</span><span·class="p"·data-group-id="0268419442-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0268419442-4">{</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0268419442-5">(</span><span·class="p"·data-group-id="0268419442-5">)</span><span·class="p">,</span><span·class="p"·data-group-id="0268419442-6">[</span><span·class="nf">term</span><span·class="p"·data-group-id="0268419442-7">(</span><span·class="p"·data-group-id="0268419442-7">)</span><span·class="p"·data-group-id="0268419442-6">]</span><span·class="p"·data-group-id="0268419442-4">}</span><span·class="p"·data-group-id="0268419442-1">)</span></code></pre><p>If·it·takes·two·arguments,·the·first·is·the·report,·and·the·second·is·a·map 
225 containing·extra·data·that·allows·direct·conversion·to·a·string:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="8947689837-1">(</span><span·class="p"·data-group-id="8947689837-2">(</span><span·c[·...·truncated·by·diffoscope;·len:·924,·SHA:·3e4a1f4a43399563e3d4c40a33e53e065b34be6c98e5423a9001b4a14ebe4c82·...·]224 arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="8044069945-1">(</span><span·class="p"·data-group-id="8044069945-2">(</span><span·class="nc">logger</span><span·class="p">:</span><span·c[·...·truncated·by·diffoscope;·len:·958,·SHA:·457d4b131d66c7d0ce1724350b2961b065325b7a740166c180441e86c6e23614·...·]
 225 containing·extra·data·that·allows·direct·conversion·to·a·string:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="5765912774-1">(</span><span·class="p"·data-group-id="5765912774-2">(</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">report</span><span·class="p"·data-group-id="5765912774-3">(</span><span·class="p"·data-group-id="5765912774-3">)</span><span·class="p">,</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">report_cb_config</span><span·class="p"·data-group-id="5765912774-4">(</span><span·class="p"·data-group-id="5765912774-4">)</span><span·class="p"·data-group-id="5765912774-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">chardata</span><span·class="p"·data-group-id="5765912774-5">(</span><span·class="p"·data-group-id="5765912774-5">)</span><span·class="p"·data-group-id="5765912774-1">)</span></code></pre><p>The·fun·must·obey·the·<code·class="inline">depth</code>·and·<code·class="inline">chars_limit</code>·parameters·provided·in·the
226 second·argument,·as·the·formatter·cannot·do·anything·useful·of·these·parameters226 second·argument,·as·the·formatter·cannot·do·anything·useful·of·these·parameters
227 with·the·returned·string.·The·extra·data·also·contains·a·field·named227 with·the·returned·string.·The·extra·data·also·contains·a·field·named
228 <code·class="inline">single_line</code>,·indicating·if·the·printed·log·message·may·contain·line·breaks·or228 <code·class="inline">single_line</code>,·indicating·if·the·printed·log·message·may·contain·line·breaks·or
229 not.·This·variant·is·used·when·the·formatting·of·the·report·depends·on·the·size229 not.·This·variant·is·used·when·the·formatting·of·the·report·depends·on·the·size
230 or·single·line·parameters.</p><p>Example,·report,·and·metadata·with·report·callback:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">debug</span><span·class="p"·data-group-id="1382060431-1">(</span><span·class="p"·data-group-id="1382060431-2">#{</span><span·class="ss">got</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">connection_request</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·361,·SHA:·bdab2eac809efa1ae7f80f65881acabfb0113bfb386dd9aedea04282e444738c·...·]1-2">}</span><span·class="p">,</span><span·class="w">230 or·single·line·parameters.</p><p>Example,·report,·and·metadata·with·report·callback:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">debug</span><span·class="p"·data-group-id="6503598641-1">(</span><span·class="p"·data-group-id="6503598641-2">#{</span><span·class="ss">got</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">connection_request</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·361,·SHA:·f8535bb1ce8f28dc056b618c5052af5b65f72a71bc4056c662dd6b212b090d00·...·]1-2">}</span><span·class="p">,</span><span·class="w">
231 ·············</span><span·class="p"·data-group-id="1382060431-3">#{</span><span·class="ss">report_cb</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1382060431-4">(</span><span·class="n">R</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·596,·SHA:·83c9b0168ed10d6ac54692b869503ab396c6db3bc50c27b2d3659983c667a239·...·]1-1">)</span></code></pre><p>The·log·message·can·also·be·provided·through·a·fun·for·lazy·evaluation.·The·fun231 ·············</span><span·class="p"·data-group-id="6503598641-3">#{</span><span·class="ss">report_cb</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="6503598641-4">(</span><span·class="n">R</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·596,·SHA:·075e2785555a56634282f98ca5addf329dd3eecf10c5487afb1981b1006b0297·...·]1-1">)</span></code></pre><p>The·log·message·can·also·be·provided·through·a·fun·for·lazy·evaluation.·The·fun
232 is·only·evaluated·if·the·primary·log·level·check·passes,·and·is·therefore232 is·only·evaluated·if·the·primary·log·level·check·passes,·and·is·therefore
233 recommended·if·it·is·expensive·to·generate·the·message.·The·lazy·fun·must·return233 recommended·if·it·is·expensive·to·generate·the·message.·The·lazy·fun·must·return
234 a·string,·a·report,·or·a·tuple·with·format·string·and·arguments.</p><h3·id="metadata"·class="section-heading">234 a·string,·a·report,·or·a·tuple·with·format·string·and·arguments.</p><h3·id="metadata"·class="section-heading">
235 ··<a·href="#metadata"·class="hover-link">235 ··<a·href="#metadata"·class="hover-link">
236 ····<i·class="ri-link-m"·aria-hidden="true"></i>236 ····<i·class="ri-link-m"·aria-hidden="true"></i>
237 ··</a>237 ··</a>
238 ··<span·class="text">Metadata</span>238 ··<span·class="text">Metadata</span>
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412 with·<a·href="../../../../lib/sasl-4.2.2/doc/html/error_logging.html">SASL·Error·Logging</a>,·which·is·specified·with412 with·<a·href="../../../../lib/sasl-4.2.2/doc/html/error_logging.html">SASL·Error·Logging</a>,·which·is·specified·with
413 <a·href="#logger_sasl_compatible"><code·class="inline">logger_sasl_compatible</code></a>.</p><p>With·this·parameter,·you·can·modify·or·disable·the·default·handler,·add·custom413 <a·href="#logger_sasl_compatible"><code·class="inline">logger_sasl_compatible</code></a>.</p><p>With·this·parameter,·you·can·modify·or·disable·the·default·handler,·add·custom
414 handlers·and·primary·logger·filters,·set·log·levels·per·module,·and·modify·the414 handlers·and·primary·logger·filters,·set·log·levels·per·module,·and·modify·the
415 <a·href="#logger-proxy">proxy</a>·configuration.</p><p><code·class="inline">Config</code>·is·any·(zero·or·more)·of·the·following:</p><ul><li><p><strong><code·class="inline">{handler,·default,·undefined}</code></strong>·-·Disables·the·default·handler.·This415 <a·href="#logger-proxy">proxy</a>·configuration.</p><p><code·class="inline">Config</code>·is·any·(zero·or·more)·of·the·following:</p><ul><li><p><strong><code·class="inline">{handler,·default,·undefined}</code></strong>·-·Disables·the·default·handler.·This
416 allows·another·application·to·add·its·own·default·handler.</p><p>Only·one·entry·of·this·type·is·allowed.</p></li><li><p><strong><code·class="inline">{handler,·HandlerId,·Module,·HandlerConfig}</code></strong>·-·If·<code·class="inline">HandlerId</code>·is416 allows·another·application·to·add·its·own·default·handler.</p><p>Only·one·entry·of·this·type·is·allowed.</p></li><li><p><strong><code·class="inline">{handler,·HandlerId,·Module,·HandlerConfig}</code></strong>·-·If·<code·class="inline">HandlerId</code>·is
417 <code·class="inline">default</code>,·then·this·entry·modifies·the·default·handler,·equivalent·to417 <code·class="inline">default</code>,·then·this·entry·modifies·the·default·handler,·equivalent·to
418 calling</p><pre><code·class="text">········logger:remove_handler(default)418 calling</p><pre><code·class="text">········logger:remove_handler(default)
419 </code></pre><p>followed·by</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="9742104416-1">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HandlerConfig</span><span·class="p"·data-group-id="9742104416-1">)</span><span·class="w">419 </code></pre><p>followed·by</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="7584667447-1">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HandlerConfig</span><span·class="p"·data-group-id="7584667447-1">)</span><span·class="w">
420 </span></code></pre><p>For·all·other·values·of·<code·class="inline">HandlerId</code>,·this·entry·adds·a·new·handler,420 </span></code></pre><p>For·all·other·values·of·<code·class="inline">HandlerId</code>,·this·entry·adds·a·new·handler,
421 equivalent·to·calling</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="7963741807-1">(</span><span·class="n">HandlerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HandlerConfig</span><span·class="p"·data-group-id="7963741807-1">)</span><span·class="w">421 equivalent·to·calling</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="1791409606-1">(</span><span·class="n">HandlerId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HandlerConfig</span><span·class="p"·data-group-id="1791409606-1">)</span><span·class="w">
422 </span></code></pre><p>Multiple·entries·of·this·type·are·allowed.</p></li><li><p><strong><code·class="inline">{filters,·FilterDefault,·[Filter]}</code></strong>·-·Adds·the·specified·primary422 </span></code></pre><p>Multiple·entries·of·this·type·are·allowed.</p></li><li><p><strong><code·class="inline">{filters,·FilterDefault,·[Filter]}</code></strong>·-·Adds·the·specified·primary
423 filters.</p><ul><li><p><code·class="inline">FilterDefault·=·log·|·stop</code></p></li><li><code·class="inline">Filter·=·{FilterId,·{FilterFun,·FilterConfig}}</code></li></ul><p>Equivalent·to·calling</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_primary_filter</span><span·class="p"·data-group-id="9296008551-1">(</span><span·class="n">FilterId</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9296008551-2">{</span><span·class="n">FilterFun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filter[·...·truncated·by·diffoscope;·len:·107,·SHA:·97ad403ebe83a0671d68425f1904c506c72546df56e83131365175df995af84c·...·]-1">)</span><span·class="w">423 filters.</p><ul><li><p><code·class="inline">FilterDefault·=·log·|·stop</code></p></li><li><code·class="inline">Filter·=·{FilterId,·{FilterFun,·FilterConfig}}</code></li></ul><p>Equivalent·to·calling</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_primary_filter</span><span·class="p"·data-group-id="1960282826-1">(</span><span·class="n">FilterId</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1960282826-2">{</span><span·class="n">FilterFun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filter[·...·truncated·by·diffoscope;·len:·107,·SHA:·fc304b5b4e9e816bda169726e97f157f8f0ea9ff2e183793fee5c2e463ef25f8·...·]-1">)</span><span·class="w">
424 </span></code></pre><p>for·each·<code·class="inline">Filter</code>.</p><p><code·class="inline">FilterDefault</code>·specifies·the·behaviour·if·all·primary·filters·return424 </span></code></pre><p>for·each·<code·class="inline">Filter</code>.</p><p><code·class="inline">FilterDefault</code>·specifies·the·behaviour·if·all·primary·filters·return
425 <code·class="inline">ignore</code>,·see·section·<a·href="#filters">Filters</a>.</p><p>Only·one·entry·of·this·type·is·allowed.</p></li><li><p><strong><code·class="inline">{module_level,·Level,·[Module]}</code></strong>·-·Sets·module·log·level·for·the·given425 <code·class="inline">ignore</code>,·see·section·<a·href="#filters">Filters</a>.</p><p>Only·one·entry·of·this·type·is·allowed.</p></li><li><p><strong><code·class="inline">{module_level,·Level,·[Module]}</code></strong>·-·Sets·module·log·level·for·the·given
426 modules.·Equivalent·to·calling</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_module_level</span><span·class="p"·data-group-id="5895370400-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Level</span><span·class="p"·data-group-id="5895370400-1">)</span></code></pre><p>for·each·<code·class="inline">Module</code>.</p><p>Multiple·entries·of·this·type·are·allowed.</p></li><li><p><strong><code·class="inline">{proxy,·ProxyConfig}</code></strong>·-·Sets·the·proxy·configuration,·equivalent·to426 modules.·Equivalent·to·calling</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_module_level</span><span·class="p"·data-group-id="6160194232-1">(</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Level</span><span·class="p"·data-group-id="6160194232-1">)</span></code></pre><p>for·each·<code·class="inline">Module</code>.</p><p>Multiple·entries·of·this·type·are·allowed.</p></li><li><p><strong><code·class="inline">{proxy,·ProxyConfig}</code></strong>·-·Sets·the·proxy·configuration,·equivalent·to
427 calling</p><pre><code·class="text">········logger:set_proxy_config(ProxyConfig)427 calling</p><pre><code·class="text">········logger:set_proxy_config(ProxyConfig)
428 </code></pre><p>Only·one·entry·of·this·type·is·allowed.</p></li></ul><p>See·section·<a·href="#configuration-examples">Configuration·Examples</a>·for428 </code></pre><p>Only·one·entry·of·this·type·is·allowed.</p></li></ul><p>See·section·<a·href="#configuration-examples">Configuration·Examples</a>·for
429 examples·using·the·<code·class="inline">logger</code>·parameter·for·system·configuration.</p></li><li><p><strong><code·class="inline"·id="logger_metadata">logger_metadata·=·map()</code></strong>·-·Specifies·the·primary429 examples·using·the·<code·class="inline">logger</code>·parameter·for·system·configuration.</p></li><li><p><strong><code·class="inline"·id="logger_metadata">logger_metadata·=·map()</code></strong>·-·Specifies·the·primary
430 metadata.·See·the·<a·href="kernel_app.html#logger_metadata"><code·class="inline">kernel(6)</code></a>·manual·page·for430 metadata.·See·the·<a·href="kernel_app.html#logger_metadata"><code·class="inline">kernel(6)</code></a>·manual·page·for
431 more·information·about·this·parameter.</p></li><li><p><strong><code·class="inline"·id="logger_level">logger_level·=·Level</code></strong>·-·Specifies·the·primary·log431 more·information·about·this·parameter.</p></li><li><p><strong><code·class="inline"·id="logger_level">logger_level·=·Level</code></strong>·-·Specifies·the·primary·log
432 level.·See·the·<a·href="kernel_app.html#logger_level"><code·class="inline">kernel(6)</code></a>·manual·page·for·more432 level.·See·the·<a·href="kernel_app.html#logger_level"><code·class="inline">kernel(6)</code></a>·manual·page·for·more
433 information·about·this·parameter.</p></li><li><p><strong><code·class="inline"·id="logger_sasl_compatible">logger_sasl_compatible·=·true·|·false</code></strong>·-433 information·about·this·parameter.</p></li><li><p><strong><code·class="inline"·id="logger_sasl_compatible">logger_sasl_compatible·=·true·|·false</code></strong>·-
Offset 442, 39 lines modifiedOffset 442, 39 lines modified
442 </h3>442 </h3>
443 <p>The·value·of·the·Kernel·configuration·parameter·<code·class="inline">logger</code>·is·a·list·of·tuples.·It443 <p>The·value·of·the·Kernel·configuration·parameter·<code·class="inline">logger</code>·is·a·list·of·tuples.·It
444 is·possible·to·write·the·term·on·the·command·line·when·starting·an·erlang·node,444 is·possible·to·write·the·term·on·the·command·line·when·starting·an·erlang·node,
445 but·as·the·term·grows,·a·better·approach·is·to·use·the·system·configuration445 but·as·the·term·grows,·a·better·approach·is·to·use·the·system·configuration
446 file.·See·the·<a·href="config.html"><code·class="inline">config(4)</code></a>·manual·page·for·more·information·about446 file.·See·the·<a·href="config.html"><code·class="inline">config(4)</code></a>·manual·page·for·more·information·about
447 this·file.</p><p>Each·of·the·following·examples·shows·a·simple·system·configuration·file·that447 this·file.</p><p>Each·of·the·following·examples·shows·a·simple·system·configuration·file·that
448 configures·Logger·according·to·the·description.</p><p>Modify·the·default·handler·to·print·to·a·file·instead·of448 configures·Logger·according·to·the·description.</p><p>Modify·the·default·handler·to·print·to·a·file·instead·of
449 <a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#t:standard_io/0"><code·class="inline">standard_io</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6487021959-1">[</span><span·class="p"·data-group-id="6487021959-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">449 <a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#t:standard_io/0"><code·class="inline">standard_io</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4016439145-1">[</span><span·class="p"·data-group-id="4016439145-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
450 ··</span><span·class="p"·data-group-id="6487021959-3">[</span><span·class="p"·data-group-id="6487021959-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">450 ··</span><span·class="p"·data-group-id="4016439145-3">[</span><span·class="p"·data-group-id="4016439145-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
451 ····</span><span·class="p"·data-group-id="6487021959-5">[</span><span·class="p"·data-group-id="6487021959-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·{handler,·HandlerId,·Module,</span><span·class="w">451 ····</span><span·class="p"·data-group-id="4016439145-5">[</span><span·class="p"·data-group-id="4016439145-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·{handler,·HandlerId,·Module,</span><span·class="w">
 452 ······</span><span·class="p"·data-group-id="4016439145-7">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4016439145-8">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/erlang.log&quot;</span><span·class="p"·data-group-id="4016439145-8">}</span><span·class="p"·data-group-id="4016439145-7">}</span><span·class="p"·data-group-id="4016439145-6">}</span><span·class="w">··</span><span·class="c1">%·Config}</span><span·class="w">
 453 ····</span><span·class="p"·data-group-id="4016439145-5">]</span><span·class="p"·data-group-id="4016439145-4">}</span><span·class="p"·data-group-id="4016439145-3">]</span><span·class="p"·data-group-id="4016439145-2">}</span><span·class="p"·data-group-id="4016439145-1">]</span><span·class="p">.</span></code></pre><p>Modify·the·default·handler·to·print·each·log·event·as·a·single·line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4720834507-1">[</span><span·class="p"·data-group-id="4720834507-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
452 ······</span><span·class="p"·data-group-id="6487021959-7">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6487021959-8">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/erlang.log&quot;</span><span·class="p"·data-group-id="6487021959-8">}</span><span·class="p"·data-group-id="6487021959-7">}</span><span·class="p"·data-group-id="6487021959-6">}</span><span·class="w">··</span><span·class="c1">%·Config}</span><span·class="w"> 
453 ····</span><span·class="p"·data-group-id="6487021959-5">]</span><span·class="p"·data-group-id="6487021959-4">}</span><span·class="p"·data-group-id="6487021959-3">]</span><span·class="p"·data-group-id="6487021959-2">}</span><span·class="p"·data-group-id="6487021959-1">]</span><span·class="p">.</span></code></pre><p>Modify·the·default·handler·to·print·each·log·event·as·a·single·line:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4114375667-1">[</span><span·class="p"·data-group-id="4114375667-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w"> 
454 ··</span><span·class="p"·data-group-id="4114375667-3">[</span><span·class="p"·data-group-id="4114375667-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w"> 
455 ····</span><span·class="p"·data-group-id="4114375667-5">[</span><span·class="p"·data-group-id="4114375667-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w"> 
456 ······</span><span·class="p"·data-group-id="4114375667-7">#{</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4114375667-8">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4114375667-9">#{</span><span·class="ss">single_line</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="4114375667-9">}</span><span·class="p"·data-group-id="4114375667-8">}</span><span·class="p"·data-group-id="4114375667-7">}</span><span·class="p"·data-group-id="4114375667-6">}</span><span·class="w"> 
457 ····</span><span·class="p"·data-group-id="4114375667-5">]</span><span·class="p"·data-group-id="4114375667-4">}</span><span·class="p"·data-group-id="4114375667-3">]</span><span·class="p"·data-group-id="4114375667-2">}</span><span·class="p"·data-group-id="4114375667-1">]</span><span·class="p">.</span></code></pre><p>Modify·the·default·handler·to·print·the·pid·of·the·logging·process·for·each·log 
458 event:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1476049965-1">[</span><span·class="p"·data-group-id="1476049965-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w"> 
459 ··</span><span·class="p"·data-group-id="1476049965-3">[</span><span·class="p"·data-group-id="1476049965-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">454 ··</span><span·class="p"·data-group-id="4720834507-3">[</span><span·class="p"·data-group-id="4720834507-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
460 ····</span><span·class="p"·data-group-id="1476049965-5">[</span><span·class="p"·data-group-id="1476049965-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">455 ····</span><span·class="p"·data-group-id="4720834507-5">[</span><span·class="p"·data-group-id="4720834507-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
 456 ······</span><span·class="p"·data-group-id="4720834507-7">#{</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4720834507-8">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4720834507-9">#{</span><span·class="ss">single_line</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="4720834507-9">}</span><span·class="p"·data-group-id="4720834507-8">}</span><span·class="p"·data-group-id="4720834507-7">}</span><span·class="p"·data-group-id="4720834507-6">}</span><span·class="w">
 457 ····</span><span·class="p"·data-group-id="4720834507-5">]</span><span·class="p"·data-group-id="4720834507-4">}</span><span·class="p"·data-group-id="4720834507-3">]</span><span·class="p"·data-group-id="4720834507-2">}</span><span·class="p"·data-group-id="4720834507-1">]</span><span·class="p">.</span></code></pre><p>Modify·the·default·handler·to·print·the·pid·of·the·logging·process·for·each·log
 458 event:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1613947371-1">[</span><span·class="p"·data-group-id="1613947371-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
 459 ··</span><span·class="p"·data-group-id="1613947371-3">[</span><span·class="p"·data-group-id="1613947371-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
 460 ····</span><span·class="p"·data-group-id="1613947371-5">[</span><span·class="p"·data-group-id="1613947371-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
461 ······</span><span·class="p"·data-group-id="1476049965-7">#{</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1476049965-8">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">461 ······</span><span·class="p"·data-group-id="1613947371-7">#{</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1613947371-8">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">
462 ························</span><span·class="p"·data-group-id="1476049965-9">#{</span><span·class="ss">template</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1476049965-10">[</span><span·class="ss">time</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·493,·SHA:·edcdd171db34527b83b5919fc006ef038a52cfaff7f957b0b2ccdcc7d2e8bd35·...·]-6">}</span><span·class="w">462 ························</span><span·class="p"·data-group-id="1613947371-9">#{</span><span·class="ss">template</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1613947371-10">[</span><span·class="ss">time</span><span·class="p">,</span><span·class="s">&quo[·...·truncated·by·diffoscope;·len:·493,·SHA:·6d4100d1aa997516472dfd381578d0f34f044310b07b0ab1dc9ded120f240aa5·...·]-6">}</span><span·class="w">
463 ····</span><span·class="p"·data-group-id="1476049965-5">]</span><span·class="p"·data-group-id="1476049965-4">}</span><span·class="p"·data-group-id="1476049965-3">]</span><span·class="p"·data-group-id="1476049965-2">}</span><span·class="p"·data-group-id="1476049965-1">]</span><span·class="p">.</span></code></pre><p>Modify·the·default·handler·to·only·print·errors·and·more·severe·log·events·to463 ····</span><span·class="p"·data-group-id="1613947371-5">]</span><span·class="p"·data-group-id="1613947371-4">}</span><span·class="p"·data-group-id="1613947371-3">]</span><span·class="p"·data-group-id="1613947371-2">}</span><span·class="p"·data-group-id="1613947371-1">]</span><span·class="p">.</span></code></pre><p>Modify·the·default·handler·to·only·print·errors·and·more·severe·log·events·to
464 &quot;log/erlang.log&quot;,·and·add·another·handler·to·print·all·log·events·to464 &quot;log/erlang.log&quot;,·and·add·another·handler·to·print·all·log·events·to
465 &quot;log/debug.log&quot;.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8379339900-1">[</span><span·class="p"·data-group-id="8379339900-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">465 &quot;log/debug.log&quot;.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2601492544-1">[</span><span·class="p"·data-group-id="2601492544-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
466 ··</span><span·class="p"·data-group-id="8379339900-3">[</span><span·class="p"·data-group-id="8379339900-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">466 ··</span><span·class="p"·data-group-id="2601492544-3">[</span><span·class="p"·data-group-id="2601492544-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
467 ····</span><span·class="p"·data-group-id="8379339900-5">[</span><span·class="p"·data-group-id="8379339900-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">467 ····</span><span·class="p"·data-group-id="2601492544-5">[</span><span·class="p"·data-group-id="2601492544-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
468 ······</span><span·class="p"·data-group-id="8379339900-7">#{</span><span·class="ss">level</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">468 ······</span><span·class="p"·data-group-id="2601492544-7">#{</span><span·class="ss">level</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">
469 ········</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8379339900-8">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/erlang.log&quot;</span><span·class="p"·data-group-id="8379339900-8">}</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·67,·SHA:·4a68b788a08af7e20857d4b2ab1eba74747cb8469e376390e11bf6aef024a0ee·...·]-6">}</span><span·class="p">,</span><span·class="w">469 ········</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2601492544-8">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/erlang.log&quot;</span><span·class="p"·data-group-id="2601492544-8">}</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·67,·SHA:·dc4d72bad42ea78fcd814234bc580954efcfd980edb0ad4f66c86d48c15bafb4·...·]-6">}</span><span·class="p">,</span><span·class="w">
470 ·····</span><span·class="p"·data-group-id="8379339900-9">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">470 ·····</span><span·class="p"·data-group-id="2601492544-9">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
471 ······</span><span·class="p"·data-group-id="8379339900-10">#{</span><span·class="ss">level</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">debug</span><span·class="p">,</span><span·class="w">471 ······</span><span·class="p"·data-group-id="2601492544-10">#{</span><span·class="ss">level</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">debug</span><span·class="p">,</span><span·class="w">
472 ········</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8379339900-11">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/debug.log&quot;</span><span·class="p"·data-group-id="8379339900-11">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·69,·SHA:·3b9a8e17f48dda7cf33c65560e55f530e0d1f6cc5b9cc5f6dc27ef7b30f51dae·...·]-9">}</span><span·class="w">472 ········</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2601492544-11">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/debug.log&quot;</span><span·class="p"·data-group-id="2601492544-11">}</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·69,·SHA:·15ea8ea97914fc402562564aa33ae572c68a497a4818ac8331257b4cfe088bc7·...·]-9">}</span><span·class="w">
473 ····</span><span·class="p"·data-group-id="8379339900-5">]</span><span·class="p"·data-group-id="8379339900-4">}</span><span·class="p"·data-group-id="8379339900-3">]</span><span·class="p"·data-group-id="8379339900-2">}</span><span·class="p"·data-group-id="8379339900-1">]</span><span·class="p">.</span></code></pre><h2·id="backwards-compatibility-with-error_logger"·class="section-heading">473 ····</span><span·class="p"·data-group-id="2601492544-5">]</span><span·class="p"·data-group-id="2601492544-4">}</span><span·class="p"·data-group-id="2601492544-3">]</span><span·class="p"·data-group-id="2601492544-2">}</span><span·class="p"·data-group-id="2601492544-1">]</span><span·class="p">.</span></code></pre><h2·id="backwards-compatibility-with-error_logger"·class="section-heading">
474 ··<a·href="#backwards-compatibility-with-error_logger"·class="hover-link">474 ··<a·href="#backwards-compatibility-with-error_logger"·class="hover-link">
475 ····<i·class="ri-link-m"·aria-hidden="true"></i>475 ····<i·class="ri-link-m"·aria-hidden="true"></i>
476 ··</a>476 ··</a>
477 ··<span·class="text">Backwards·Compatibility·with·error_logger</span>477 ··<span·class="text">Backwards·Compatibility·with·error_logger</span>
478 </h2>478 </h2>
479 <p>Logger·provides·backwards·compatibility·with·<code·class="inline">error_logger</code>·in·the·following479 <p>Logger·provides·backwards·compatibility·with·<code·class="inline">error_logger</code>·in·the·following
480 ways:</p><ul><li><p><strong>API·for·Logging</strong>·-·The·<code·class="inline">error_logger</code>·API·still·exists,·but·should·only·be480 ways:</p><ul><li><p><strong>API·for·Logging</strong>·-·The·<code·class="inline">error_logger</code>·API·still·exists,·but·should·only·be
Offset 507, 17 lines modifiedOffset 507, 17 lines modified
507 <code·class="inline">true</code>.·The507 <code·class="inline">true</code>.·The
508 <a·href="../../../../lib/sasl-4.2.2/doc/html/sasl_app.html#deprecated_error_logger_config">SASL·configuration·parameters</a>508 <a·href="../../../../lib/sasl-4.2.2/doc/html/sasl_app.html#deprecated_error_logger_config">SASL·configuration·parameters</a>
509 can·then·be·used·as·before,·and·the·SASL·reports·will·only·be·printed·if·the509 can·then·be·used·as·before,·and·the·SASL·reports·will·only·be·printed·if·the
510 SASL·application·is·running,·through·a·second·log·handler·named·<code·class="inline">sasl</code>.</p><p>All·SASL·reports·have·a·metadata·field·<code·class="inline">domain</code>·which·is·set·to·<code·class="inline">[otp,sasl]</code>.510 SASL·application·is·running,·through·a·second·log·handler·named·<code·class="inline">sasl</code>.</p><p>All·SASL·reports·have·a·metadata·field·<code·class="inline">domain</code>·which·is·set·to·<code·class="inline">[otp,sasl]</code>.
511 This·field·can·be·used·by·filters·to·stop·or·allow·the·log·events.</p><p>See·section·<a·href="../../../../lib/sasl-4.2.2/doc/html/error_logging.html">SASL·User's·Guide</a>·for·more511 This·field·can·be·used·by·filters·to·stop·or·allow·the·log·events.</p><p>See·section·<a·href="../../../../lib/sasl-4.2.2/doc/html/error_logging.html">SASL·User's·Guide</a>·for·more
512 information·about·the·old·SASL·error·logging·functionality.</p></li><li><p><strong><a·href=""·id="legacy_event_handlers"></a>·Legacy·Event·Handlers</strong><br/>To·use·event·handlers·written·for·<code·class="inline">error_logger</code>,·just·add·your·event·handler512 information·about·the·old·SASL·error·logging·functionality.</p></li><li><p><strong><a·href=""·id="legacy_event_handlers"></a>·Legacy·Event·Handlers</strong><br/>To·use·event·handlers·written·for·<code·class="inline">error_logger</code>,·just·add·your·event·handler
513 with</p><pre><code·class="text">error_logger:add_report_handler/1,2.</code></pre><p>This·automatically·starts·the·error·logger·event·manager,·and·adds513 with</p><pre><code·class="text">error_logger:add_report_handler/1,2.</code></pre><p>This·automatically·starts·the·error·logger·event·manager,·and·adds
514 <code·class="inline">error_logger</code>·as·a·handler·to·Logger,·with·the·following·configuration:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7892279567-1">#{</span><span·class="ss">level</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">514 <code·class="inline">error_logger</code>·as·a·handler·to·Logger,·with·the·following·configuration:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1892320436-1">#{</span><span·class="ss">level</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">
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140 </h2>140 </h2>
141 <h3·id="print-the-primary-logger-configurations"·class="section-heading">141 <h3·id="print-the-primary-logger-configurations"·class="section-heading">
142 ··<a·href="#print-the-primary-logger-configurations"·class="hover-link">142 ··<a·href="#print-the-primary-logger-configurations"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
144 ··</a>144 ··</a>
145 ··<span·class="text">Print·the·primary·Logger·configurations.</span>145 ··<span·class="text">Print·the·primary·Logger·configurations.</span>
146 </h3>146 </h3>
147 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">i</span><span·class="p"·data-group-id="9280357916-1">(</span><span·class="ss">primary</span><span·class="p"·data-group-id="9280357916-1">)</span><span·class="p">.</span><span·class="w">147 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">i</span><span·class="p"·data-group-id="9011883394-1">(</span><span·class="ss">primary</span><span·class="p"·data-group-id="9011883394-1">)</span><span·class="p">.</span><span·class="w">
148 </span><span·class="n">Primary</span><span·class="w">·</span><span·class="nc">configuration</span><span·class="p">:</span><span·class="w">148 </span><span·class="n">Primary</span><span·class="w">·</span><span·class="nc">configuration</span><span·class="p">:</span><span·class="w">
149 ····</span><span·class="n">Level</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">notice</span><span·class="w">149 ····</span><span·class="n">Level</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">notice</span><span·class="w">
150 ····</span><span·class="n">Filter</span><span·class="w">·</span><span·class="n">Default</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">log</span><span·class="w">150 ····</span><span·class="n">Filter</span><span·class="w">·</span><span·class="n">Default</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">log</span><span·class="w">
151 ····</span><span·class="n">Filters</span><span·class="p">:</span><span·class="w">151 ····</span><span·class="n">Filters</span><span·class="p">:</span><span·class="w">
152 ········</span><span·class="p"·data-group-id="9280357916-2">(</span><span·class="ss">none</span><span·class="p"·data-group-id="9280357916-2">)</span></code></pre><p>It·is·also·possible·to·fetch·the·configuration·using152 ········</span><span·class="p"·data-group-id="9011883394-2">(</span><span·class="ss">none</span><span·class="p"·data-group-id="9011883394-2">)</span></code></pre><p>It·is·also·possible·to·fetch·the·configuration·using
153 <a·href="logger.html#get_primary_config/0"><code·class="inline">logger:get_primary_config()</code></a>.</p><h4>See·also</h4><ul><li><a·href="logger.html#i/0">logger:i()</a></li><li><a·href="logger_chapter.html#configuration">Configuration</a>·in·the·Logging·User's·Guide</li></ul><h3·id="print-the-configuration-of-all-handlers"·class="section-heading">153 <a·href="logger.html#get_primary_config/0"><code·class="inline">logger:get_primary_config()</code></a>.</p><h4>See·also</h4><ul><li><a·href="logger.html#i/0">logger:i()</a></li><li><a·href="logger_chapter.html#configuration">Configuration</a>·in·the·Logging·User's·Guide</li></ul><h3·id="print-the-configuration-of-all-handlers"·class="section-heading">
154 ··<a·href="#print-the-configuration-of-all-handlers"·class="hover-link">154 ··<a·href="#print-the-configuration-of-all-handlers"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">Print·the·configuration·of·all·handlers.</span>157 ··<span·class="text">Print·the·configuration·of·all·handlers.</span>
158 </h3>158 </h3>
159 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">i</span><span·class="p"·data-group-id="9219003520-1">(</span><span·class="ss">handlers</span><span·class="p"·data-group-id="9219003520-1">)</span><span·class="p">.</span><span·class="w">159 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">i</span><span·class="p"·data-group-id="7864696226-1">(</span><span·class="ss">handlers</span><span·class="p"·data-group-id="7864696226-1">)</span><span·class="p">.</span><span·class="w">
160 </span><span·class="n">Handler</span><span·class="w">·</span><span·class="nc">configuration</span><span·class="p">:</span><span·class="w">160 </span><span·class="n">Handler</span><span·class="w">·</span><span·class="nc">configuration</span><span·class="p">:</span><span·class="w">
161 ····</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">default</span><span·class="w">161 ····</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">default</span><span·class="w">
162 ········</span><span·class="n">Module</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="w">162 ········</span><span·class="n">Module</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="w">
163 ········</span><span·class="n">Level</span><span·class="p">:</span><span·class="w">··</span><span·class="ss">all</span><span·class="w">163 ········</span><span·class="n">Level</span><span·class="p">:</span><span·class="w">··</span><span·class="ss">all</span><span·class="w">
164 ········</span><span·class="n">Formatter</span><span·class="p">:</span><span·class="w">164 ········</span><span·class="n">Formatter</span><span·class="p">:</span><span·class="w">
165 ············</span><span·class="n">Module</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">logger_formatter</span><span·class="w">165 ············</span><span·class="n">Module</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">logger_formatter</span><span·class="w">
166 ············</span><span·class="n">Config</span><span·class="p">:</span><span·class="w">166 ············</span><span·class="n">Config</span><span·class="p">:</span><span·class="w">
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169 ········</span><span·class="n">Filter</span><span·class="w">·</span><span·class="n">Default</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stop</span><span·class="w">169 ········</span><span·class="n">Filter</span><span·class="w">·</span><span·class="n">Default</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stop</span><span·class="w">
170 ········</span><span·class="n">Filters</span><span·class="p">:</span><span·class="w">170 ········</span><span·class="n">Filters</span><span·class="p">:</span><span·class="w">
171 ············</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">remote_gl</span><span·class="w">171 ············</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">remote_gl</span><span·class="w">
172 ················</span><span·class="n">Fun</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">remote_gl</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">172 ················</span><span·class="n">Fun</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">remote_gl</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">
173 ················</span><span·class="n">Arg</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stop</span><span·class="w">173 ················</span><span·class="n">Arg</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stop</span><span·class="w">
174 ············</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">domain</span><span·class="w">174 ············</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">domain</span><span·class="w">
175 ················</span><span·class="n">Fun</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">175 ················</span><span·class="n">Fun</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">
176 ················</span><span·class="n">Arg</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9219003520-2">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="ss">super</span><span·class="p">,</span><span·class="p"·data-group-id="9219003520-3">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="ss">sasl</spa[·...·truncated·by·diffoscope;·len:·96,·SHA:·f14dd8e889040af4c0cb24e11012e6bc409e39a1cf8993564bb7694a28c31f9d·...·]-2">}</span><span·class="w">176 ················</span><span·class="n">Arg</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="7864696226-2">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="ss">super</span><span·class="p">,</span><span·class="p"·data-group-id="7864696226-3">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="ss">sasl</spa[·...·truncated·by·diffoscope;·len:·96,·SHA:·7836ee969d1c40b1cc96cd2917620977933215991aa1c603d8954452041af9ee·...·]-2">}</span><span·class="w">
177 ············</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">no_domain</span><span·class="w">177 ············</span><span·class="n">Id</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">no_domain</span><span·class="w">
178 ················</span><span·class="n">Fun</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">178 ················</span><span·class="n">Fun</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">
179 ················</span><span·class="n">Arg</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9219003520-4">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="p"·data-group-id="9219003520-5">[</span><span·class="p"·data-group-id="9219003520-5">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·e3b7a7d81edf32a476d978fcca55bbe1a2e7856fefb3c027944f28d1ac96b26a·...·]-4">}</span><span·class="w">179 ················</span><span·class="n">Arg</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="7864696226-4">{</span><span·class="ss">log</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="p"·data-group-id="7864696226-5">[</span><span·class="p"·data-group-id="7864696226-5">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·8f9a2295e48e42b5a00f78cc180114971867163b590a1d3047beb522edbea5b3·...·]-4">}</span><span·class="w">
180 ········</span><span·class="n">Handler</span><span·class="w">·</span><span·class="n">Config</span><span·class="p">:</span><span·class="w">180 ········</span><span·class="n">Handler</span><span·class="w">·</span><span·class="n">Config</span><span·class="p">:</span><span·class="w">
181 ············</span><span·class="nc">burst_limit_enable</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">181 ············</span><span·class="nc">burst_limit_enable</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">true</span><span·class="w">
182 ············</span><span·class="nc">burst_limit_max_count</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">500</span><span·class="w">182 ············</span><span·class="nc">burst_limit_max_count</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">500</span><span·class="w">
183 ············</span><span·class="nc">burst_limit_window_time</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">1000</span><span·class="w">183 ············</span><span·class="nc">burst_limit_window_time</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">1000</span><span·class="w">
184 ············</span><span·class="nc">drop_mode_qlen</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">200</span><span·class="w">184 ············</span><span·class="nc">drop_mode_qlen</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">200</span><span·class="w">
185 ············</span><span·class="nc">filesync_repeat_interval</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">no_repeat</span><span·class="w">185 ············</span><span·class="nc">filesync_repeat_interval</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">no_repeat</span><span·class="w">
186 ············</span><span·class="nc">flush_qlen</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">1000</span><span·class="w">186 ············</span><span·class="nc">flush_qlen</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">1000</span><span·class="w">
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211 level·to·<code·class="inline">info</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">kernel</span><span·class="w">·</span><span·class="ss">logger_level</span><span·class="w">·</span><span·class="ss">info</span><span·class="w">211 level·to·<code·class="inline">info</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">kernel</span><span·class="w">·</span><span·class="ss">logger_level</span><span·class="w">·</span><span·class="ss">info</span><span·class="w">
212 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">-</span><span·class="n">Nov</span><span·class="o">-</span><span·class="mi">2019</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">33</span><span·class="p">:</span><span·class="mf">11.742069</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">212 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">-</span><span·class="n">Nov</span><span·class="o">-</span><span·class="mi">2019</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">33</span><span·class="p">:</span><span·class="mf">11.742069</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
213 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">kernel</span><span·class="w">213 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">kernel</span><span·class="w">
214 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">214 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">
215 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">-</span><span·class="n">Nov</span><span·class="o">-</span><span·class="mi">2019</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">33</span><span·class="p">:</span><span·class="mf">11.746546</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">215 </span><span·class="o">=</span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="o">==</span><span·class="o">==</span><span·class="w">·</span><span·class="mi">4</span><span·class="o">-</span><span·class="n">Nov</span><span·class="o">-</span><span·class="mi">2019</span><span·class="p">:</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">33</span><span·class="p">:</span><span·class="mf">11.746546</span><span·class="w">·</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
216 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stdlib</span><span·class="w">216 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">stdlib</span><span·class="w">
217 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">217 ····</span><span·class="nc">started_at</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">nonode@nohost</span><span·class="w">
218 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.3</span><span·class="w">··</span><span·class="p"·data-group-id="4812025764-1">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="4812025764-1">)</span><span·class="w">218 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.3</span><span·class="w">··</span><span·class="p"·data-group-id="0875317268-1">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0875317268-1">)</span><span·class="w">
219 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre><h2·id="configure-logger-formatter"·class="section-heading">219 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre><h2·id="configure-logger-formatter"·class="section-heading">
220 ··<a·href="#configure-logger-formatter"·class="hover-link">220 ··<a·href="#configure-logger-formatter"·class="hover-link">
221 ····<i·class="ri-link-m"·aria-hidden="true"></i>221 ····<i·class="ri-link-m"·aria-hidden="true"></i>
222 ··</a>222 ··</a>
223 ··<span·class="text">Configure·Logger·formatter</span>223 ··<span·class="text">Configure·Logger·formatter</span>
224 </h2>224 </h2>
225 <p>In·order·to·fit·better·into·your·existing·logging·infrastructure·Logger·can225 <p>In·order·to·fit·better·into·your·existing·logging·infrastructure·Logger·can
Offset 229, 40 lines modifiedOffset 229, 40 lines modified
229 ····<i·class="ri-link-m"·aria-hidden="true"></i>229 ····<i·class="ri-link-m"·aria-hidden="true"></i>
230 ··</a>230 ··</a>
231 ··<span·class="text">Single·line·configuration</span>231 ··<span·class="text">Single·line·configuration</span>
232 </h3>232 </h3>
233 <p>Since·single·line·logging·is·the·default·of·the·built-in·formatter·you·only·have233 <p>Since·single·line·logging·is·the·default·of·the·built-in·formatter·you·only·have
234 to·provide·the·empty·map·as·the·configuration.·The·example·below·uses·the234 to·provide·the·empty·map·as·the·configuration.·The·example·below·uses·the
235 <code·class="inline">sys.config</code>·to·change·the·formatter·configuration.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">sys</span><span·class="p">.</span><span·class="ss">config</span><span·class="w">235 <code·class="inline">sys.config</code>·to·change·the·formatter·configuration.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">sys</span><span·class="p">.</span><span·class="ss">config</span><span·class="w">
236 </span><span·class="p"·data-group-id="7321133611-1">[</span><span·class="p"·data-group-id="7321133611-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">236 </span><span·class="p"·data-group-id="2105063270-1">[</span><span·class="p"·data-group-id="2105063270-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
237 ··</span><span·class="p"·data-group-id="7321133611-3">[</span><span·class="p"·data-group-id="7321133611-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">237 ··</span><span·class="p"·data-group-id="2105063270-3">[</span><span·class="p"·data-group-id="2105063270-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
238 ····</span><span·class="p"·data-group-id="7321133611-5">[</span><span·class="p"·data-group-id="7321133611-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">238 ····</span><span·class="p"·data-group-id="2105063270-5">[</span><span·class="p"·data-group-id="2105063270-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
239 ······</span><span·class="p"·data-group-id="7321133611-7">#{</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7321133611-8">{</span><span·class="ss">logger_formatter</span><span·c[·...·truncated·by·diffoscope;·len:·584,·SHA:·f95ef8eb163bc691579cf0aa3c495c732ea2c5279cd22e501d1a108d663375e5·...·]-1">]</span><span·class="p">.</span><span·class="w">239 ······</span><span·class="p"·data-group-id="2105063270-7">#{</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2105063270-8">{</span><span·class="ss">logger_formatter</span><span·c[·...·truncated·by·diffoscope;·len:·584,·SHA:·4b17932815a5265b6c21892c58daab30c21fb6a5da668df7188265e1561f61a8·...·]-1">]</span><span·class="p">.</span><span·class="w">
240 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="ss">sys</span><span·class="w">240 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="ss">sys</span><span·class="w">
241 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.1</span><span·class="w">··</span><span·class="p"·data-group-id="7321133611-10">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7321133611-10">)</span><span·class="gp·unselectable">241 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.1</span><span·class="w">··</span><span·class="p"·data-group-id="2105063270-10">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="2105063270-10">)</span><span·class="gp·unselectable">
242 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="7321133611-11">(</span><span·class="s">&quot;Oh·noes,·an·error&quot;</span><span·class="p"·data-group-id="7321133611-11">)</span><span·class="p">.</span><span·class="w">242 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="2105063270-11">(</span><span·class="s">&quot;Oh·noes,·an·error&quot;</span><span·class="p"·data-group-id="2105063270-11">)</span><span·class="p">.</span><span·class="w">
243 </span><span·class="mi">1962</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">03</span><span·class="n">T11</span><span·class="p">:</span><span·class="mi">07</span><span·class="p">:</span><span·class="mf">47.466763</span><span·class="o">-</span><span·class="mi">04</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">an</span><span·class="w">·</span><span·class="ss">error</span></code></pre><p>However,·if·you·just·want·to·change·it·for·the·current·session·you·can·also·do243 </span><span·class="mi">1962</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">03</span><span·class="n">T11</span><span·class="p">:</span><span·class="mi">07</span><span·class="p">:</span><span·class="mf">47.466763</span><span·class="o">-</span><span·class="mi">04</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">an</span><span·class="w">·</span><span·class="ss">error</span></code></pre><p>However,·if·you·just·want·to·change·it·for·the·current·session·you·can·also·do
244 that.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="8856289737-1">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8856289737-2">{</span><span·class="ss">logge[·...·truncated·by·diffoscope;·len:·267,·SHA:·31157c16c7a6fb584f7352b76486e913c8b35ea15503e136ef90e5ac9c5a8b4e·...·]-1">)</span><span·class="p">.</span><span·class="w">244 that.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="8628649678-1">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8628649678-2">{</span><span·class="ss">logge[·...·truncated·by·diffoscope;·len:·267,·SHA:·aceafc01eaded807ab980de03ff237bd1582ccd4ddfc80568185c84b9bedc907·...·]-1">)</span><span·class="p">.</span><span·class="w">
245 </span><span·class="ss">ok</span><span·class="gp·unselectable">245 </span><span·class="ss">ok</span><span·class="gp·unselectable">
246 2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="8856289737-4">(</span><span·class="s">&quot;Oh·noes,·another·error&quot;</span><span·class="p"·data-group-id="8856289737-4">)</span><span·class="p">.</span><span·class="w">246 2&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="8628649678-4">(</span><span·class="s">&quot;Oh·noes,·another·error&quot;</span><span·class="p"·data-group-id="8628649678-4">)</span><span·class="p">.</span><span·class="w">
247 </span><span·class="mi">1962</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">04</span><span·class="n">T15</span><span·class="p">:</span><span·class="mi">34</span><span·class="p">:</span><span·class="mf">02.648713</span><span·class="o">-</span><span·class="mi">04</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">another</span><span·class="w">·</span><span·class="ss">error</span></code></pre><h4>See·also</h4><ul><li><a·href="logger_formatter.html#t:config/0">logger_formatter's·Configuration</a></li><li><a·href="logger_chapter.html#formatters">Formatters</a>·in·the·Logging·User's·Guide</li><li><a·href="logger.html#set_handler_config/3"><code·class="inline">logger:set_handler_config/3</code></a></li></ul><h3·id="add-file-and-line-number-to-log-entries"·class="section-heading">247 </span><span·class="mi">1962</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">04</span><span·class="n">T15</span><span·class="p">:</span><span·class="mi">34</span><span·class="p">:</span><span·class="mf">02.648713</span><span·class="o">-</span><span·class="mi">04</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">another</span><span·class="w">·</span><span·class="ss">error</span></code></pre><h4>See·also</h4><ul><li><a·href="logger_formatter.html#t:config/0">logger_formatter's·Configuration</a></li><li><a·href="logger_chapter.html#formatters">Formatters</a>·in·the·Logging·User's·Guide</li><li><a·href="logger.html#set_handler_config/3"><code·class="inline">logger:set_handler_config/3</code></a></li></ul><h3·id="add-file-and-line-number-to-log-entries"·class="section-heading">
248 ··<a·href="#add-file-and-line-number-to-log-entries"·class="hover-link">248 ··<a·href="#add-file-and-line-number-to-log-entries"·class="hover-link">
249 ····<i·class="ri-link-m"·aria-hidden="true"></i>249 ····<i·class="ri-link-m"·aria-hidden="true"></i>
250 ··</a>250 ··</a>
251 ··<span·class="text">Add·file·and·line·number·to·log·entries</span>251 ··<span·class="text">Add·file·and·line·number·to·log·entries</span>
252 </h3>252 </h3>
253 <p>You·can·change·what·is·printed·to·the·log·by·using·the·formatter·template:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">sys</span><span·class="p">.</span><span·class="ss">config</span><span·class="w">253 <p>You·can·change·what·is·printed·to·the·log·by·using·the·formatter·template:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">sys</span><span·class="p">.</span><span·class="ss">config</span><span·class="w">
254 </span><span·class="p"·data-group-id="4858555657-1">[</span><span·class="p"·data-group-id="4858555657-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">254 </span><span·class="p"·data-group-id="0301767248-1">[</span><span·class="p"·data-group-id="0301767248-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
255 ··</span><span·class="p"·data-group-id="4858555657-3">[</span><span·class="p"·data-group-id="4858555657-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">255 ··</span><span·class="p"·data-group-id="0301767248-3">[</span><span·class="p"·data-group-id="0301767248-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
256 ····</span><span·class="p"·data-group-id="4858555657-5">[</span><span·class="p"·data-group-id="4858555657-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">256 ····</span><span·class="p"·data-group-id="0301767248-5">[</span><span·class="p"·data-group-id="0301767248-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
257 ······</span><span·class="p"·data-group-id="4858555657-7">#{</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4858555657-8">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">257 ······</span><span·class="p"·data-group-id="0301767248-7">#{</span><span·class="w">·</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0301767248-8">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">
258 ········</span><span·class="p"·data-group-id="4858555657-9">#{</span><span·class="w">·</span><span·class="ss">template</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4858555657-10">[</span><span·class="ss">time</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·1058,·SHA:·91134f541109203f2c0d3504d08e7e3449d74208dc933372222bb4e4374b76ed·...·]-1">]</span><span·class="p">.</span><span·class="w">258 ········</span><span·class="p"·data-group-id="0301767248-9">#{</span><span·class="w">·</span><span·class="ss">template</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0301767248-10">[</span><span·class="ss">time</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·1058,·SHA:·c46ceafbbe4b9427a2827c5616ff95c95acf7ae9a183bcd7bfb20309f4d596f1·...·]-1">]</span><span·class="p">.</span><span·class="w">
259 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="ss">sys</span><span·class="w">259 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="ss">sys</span><span·class="w">
260 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.1</span><span·class="w">··</span><span·class="p"·data-group-id="4858555657-11">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="4858555657-11">)</span><span·class="gp·unselectable">260 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.1</span><span·class="w">··</span><span·class="p"·data-group-id="0301767248-11">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0301767248-11">)</span><span·class="gp·unselectable">
261 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="4858555657-12">(</span><span·class="s">&quot;Oh·noes,·more·errors&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="4858555657-13">#{</span><span·class="w">·</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</[·...·truncated·by·diffoscope;·len:·369,·SHA:·8904e72f5bd6fdc5ca8fc981bd5ca0c54a8bcf113b575d08682689222073f897·...·]-12">)</span><span·class="p">.</span><span·class="w">261 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="0301767248-12">(</span><span·class="s">&quot;Oh·noes,·more·errors&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0301767248-13">#{</span><span·class="w">·</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</[·...·truncated·by·diffoscope;·len:·369,·SHA:·f0050159ea61daa85d625100b423f24e817d04492e38381a662e230bcd1c1fdb·...·]-12">)</span><span·class="p">.</span><span·class="w">
262 </span><span·class="mi">1962</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">05</span><span·class="n">T07</span><span·class="p">:</span><span·class="mi">37</span><span·class="p">:</span><span·class="mf">44.104241</span><span·class="o">+</span><span·class="mi">02</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="ss">shell</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">1</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">more</span><span·class="w">·</span><span·class="ss">errors</span></code></pre><p>Note·that·file·and·line·have·to·be·added·in·the·metadata·by·the·caller·of262 </span><span·class="mi">1962</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">05</span><span·class="n">T07</span><span·class="p">:</span><span·class="mi">37</span><span·class="p">:</span><span·class="mf">44.104241</span><span·class="o">+</span><span·class="mi">02</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="ss">shell</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">1</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">more</span><span·class="w">·</span><span·class="ss">errors</span></code></pre><p>Note·that·file·and·line·have·to·be·added·in·the·metadata·by·the·caller·of
263 <a·href="logger.html#log/3"><code·class="inline">logger:log/3</code></a>·as·otherwise·Logger·will·not·know·from·where·it·was·called.·The263 <a·href="logger.html#log/3"><code·class="inline">logger:log/3</code></a>·as·otherwise·Logger·will·not·know·from·where·it·was·called.·The
264 file·and·line·number·are·automatically·added·if·you·use·the·<code·class="inline">?LOG_ERROR</code>·macros264 file·and·line·number·are·automatically·added·if·you·use·the·<code·class="inline">?LOG_ERROR</code>·macros
265 in·<code·class="inline">kernel/include/logger.hrl</code>.</p><h4>See·also</h4><ul><li><a·href="logger_formatter.html#t:config/0">logger_formatter's·Configuration</a></li><li><a·href="logger_formatter.html#t:template/0">logger_formatter's·Template</a></li><li><a·href="logger.html#module-macros">Logger·Macros</a></li><li><a·href="logger_chapter.html#metadata">Metadata</a>·in·the·Logging·User's·Guide</li></ul><h2·id="configuring-handlers"·class="section-heading">265 in·<code·class="inline">kernel/include/logger.hrl</code>.</p><h4>See·also</h4><ul><li><a·href="logger_formatter.html#t:config/0">logger_formatter's·Configuration</a></li><li><a·href="logger_formatter.html#t:template/0">logger_formatter's·Template</a></li><li><a·href="logger.html#module-macros">Logger·Macros</a></li><li><a·href="logger_chapter.html#metadata">Metadata</a>·in·the·Logging·User's·Guide</li></ul><h2·id="configuring-handlers"·class="section-heading">
266 ··<a·href="#configuring-handlers"·class="hover-link">266 ··<a·href="#configuring-handlers"·class="hover-link">
267 ····<i·class="ri-link-m"·aria-hidden="true"></i>267 ····<i·class="ri-link-m"·aria-hidden="true"></i>
268 ··</a>268 ··</a>
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271 <h3·id="print-logs-to-a-file"·class="section-heading">271 <h3·id="print-logs-to-a-file"·class="section-heading">
272 ··<a·href="#print-logs-to-a-file"·class="hover-link">272 ··<a·href="#print-logs-to-a-file"·class="hover-link">
273 ····<i·class="ri-link-m"·aria-hidden="true"></i>273 ····<i·class="ri-link-m"·aria-hidden="true"></i>
274 ··</a>274 ··</a>
275 ··<span·class="text">Print·logs·to·a·file</span>275 ··<span·class="text">Print·logs·to·a·file</span>
276 </h3>276 </h3>
277 <p>Instead·of·printing·the·logs·to·stdout·we·print·them·to·a·rotating·file·log.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">sys</span><span·class="p">.</span><span·class="ss">config</span><span·class="w">277 <p>Instead·of·printing·the·logs·to·stdout·we·print·them·to·a·rotating·file·log.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">sys</span><span·class="p">.</span><span·class="ss">config</span><span·class="w">
278 </span><span·class="p"·data-group-id="3694062226-1">[</span><span·class="p"·data-group-id="3694062226-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">278 </span><span·class="p"·data-group-id="0550002707-1">[</span><span·class="p"·data-group-id="0550002707-2">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">
279 ··</span><span·class="p"·data-group-id="3694062226-3">[</span><span·class="p"·data-group-id="3694062226-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">279 ··</span><span·class="p"·data-group-id="0550002707-3">[</span><span·class="p"·data-group-id="0550002707-4">{</span><span·class="ss">logger</span><span·class="p">,</span><span·class="w">
280 ····</span><span·class="p"·data-group-id="3694062226-5">[</span><span·class="p"·data-group-id="3694062226-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">280 ····</span><span·class="p"·data-group-id="0550002707-5">[</span><span·class="p"·data-group-id="0550002707-6">{</span><span·class="ss">handler</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
281 ······</span><span·class="p"·data-group-id="3694062226-7">#{</span><span·class="w">·</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3694062226-8">#{</span><span·class="w">·</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/erlang.log&quot;</span><span·class="p">,</span><span·class="w">281 ······</span><span·class="p"·data-group-id="0550002707-7">#{</span><span·class="w">·</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0550002707-8">#{</span><span·class="w">·</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;log/erlang.log&quot;</span><span·class="p">,</span><span·class="w">
282 ······················</span><span·class="ss">max_no_bytes</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">4096</span><span·class="p">,</span><span·class="w">282 ······················</span><span·class="ss">max_no_bytes</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">4096</span><span·class="p">,</span><span·class="w">
283 ······················</span><span·class="ss">max_no_files</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="3694062226-8">}</span><span·class="p">,</span><span·class="w">283 ······················</span><span·class="ss">max_no_files</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="0550002707-8">}</span><span·class="p">,</span><span·class="w">
284 ·········</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3694062226-9">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3694062226-10">#{</span><span·class="p"·data-group-id="3694062226-10">}</span><span·class="p"·data-group-id="369406[·...·truncated·by·diffoscope;·len:·375,·SHA:·2c75392ef511acceca0f2c8b7ea7836c4f8fc3de539bbf7ee80385eaf3b16ba2·...·]-1">]</span><span·class="p">.</span><span·class="w">284 ·········</span><span·class="ss">formatter</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0550002707-9">{</span><span·class="ss">logger_formatter</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0550002707-10">#{</span><span·class="p"·data-group-id="0550002707-10">}</span><span·class="p"·data-group-id="055000[·...·truncated·by·diffoscope;·len:·375,·SHA:·cf0aac3b8aa8892bbd587984b734010182f04ebc3d211ea834c46e730b3b13e5·...·]-1">]</span><span·class="p">.</span><span·class="w">
285 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="ss">sys</span><span·class="w">285 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="ss">sys</span><span·class="w">
286 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.1</span><span·class="w">··</span><span·class="p"·data-group-id="3694062226-11">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="3694062226-11">)</span><span·class="gp·unselectable">286 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V10</span><span·class="p">.</span><span·class="mf">5.1</span><span·class="w">··</span><span·class="p"·data-group-id="0550002707-11">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0550002707-11">)</span><span·class="gp·unselectable">
287 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="3694062226-12">(</span><span·class="s">&quot;Oh·noes,·even·more·errors&quot;</span><span·class="p"·data-group-id="3694062226-12">)</span><span·class="p">.</span><span·class="w">287 1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="0550002707-12">(</span><span·class="s">&quot;Oh·noes,·even·more·errors&quot;</span><span·class="p"·data-group-id="0550002707-12">)</span><span·class="p">.</span><span·class="w">
288 </span><span·class="ss">ok</span><span·class="gp·unselectable">288 </span><span·class="ss">ok</span><span·class="gp·unselectable">
289 2&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">halt</span><span·class="p"·data-group-id="3694062226-13">(</span><span·class="p"·data-group-id="3694062226-13">)</span><span·class="p">.</span><span·class="w">289 2&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">halt</span><span·class="p"·data-group-id="0550002707-13">(</span><span·class="p"·data-group-id="0550002707-13">)</span><span·class="p">.</span><span·class="w">
290 </span><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">log</span><span·class="o">/</span><span·class="ss">erlang</span><span·class="p">.</span><span·class="ss">log</span><span·class="w">290 </span><span·class="sc">$·</span><span·class="ss">cat</span><span·class="w">·</span><span·class="ss">log</span><span·class="o">/</span><span·class="ss">erlang</span><span·class="p">.</span><span·class="ss">log</span><span·class="w">
291 </span><span·class="mi">2019</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">07</span><span·class="n">T11</span><span·class="p">:</span><span·class="mi">47</span><span·class="p">:</span><span·class="mf">16.837958</span><span·class="o">+</span><span·class="mi">02</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">even</span><span·class="w">·</span><span·class="ss">more</span><span·class="w">·</span><span·class="ss">errors</span></code></pre><h4>See·also</h4><ul><li><a·href="logger_std_h.html"><code·class="inline">logger_std_h</code></a></li><li><a·href="logger_chapter.html#handlers">Handlers</a>·in·the·Logging·User's·Guide</li></ul><h3·id="debug-only-handler"·class="section-heading">291 </span><span·class="mi">2019</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">07</span><span·class="n">T11</span><span·class="p">:</span><span·class="mi">47</span><span·class="p">:</span><span·class="mf">16.837958</span><span·class="o">+</span><span·class="mi">02</span><span·class="p">:</span><span·class="mi">00</span><span·class="w">·</span><span·class="nc">error</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Oh</span><span·class="w">·</span><span·class="ss">noes</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">even</span><span·class="w">·</span><span·class="ss">more</span><span·class="w">·</span><span·class="ss">errors</span></code></pre><h4>See·also</h4><ul><li><a·href="logger_std_h.html"><code·class="inline">logger_std_h</code></a></li><li><a·href="logger_chapter.html#handlers">Handlers</a>·in·the·Logging·User's·Guide</li></ul><h3·id="debug-only-handler"·class="section-heading">
292 ··<a·href="#debug-only-handler"·class="hover-link">292 ··<a·href="#debug-only-handler"·class="hover-link">
293 ····<i·class="ri-link-m"·aria-hidden="true"></i>293 ····<i·class="ri-link-m"·aria-hidden="true"></i>
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160 sync·if·something·has·actually·been·logged.</p><p>Defaults·to·<code·class="inline">5000</code>·milliseconds.</p><p>If·<code·class="inline">no_repeat</code>·is·set·as·value,·the·repeated·sync·operation·is·disabled.·The160 sync·if·something·has·actually·been·logged.</p><p>Defaults·to·<code·class="inline">5000</code>·milliseconds.</p><p>If·<code·class="inline">no_repeat</code>·is·set·as·value,·the·repeated·sync·operation·is·disabled.·The
161 user·can·also·call·the·<a·href="#filesync/1"><code·class="inline">filesync/1</code></a>·function·to·perform·a161 user·can·also·call·the·<a·href="#filesync/1"><code·class="inline">filesync/1</code></a>·function·to·perform·a
162 disk_log·sync.</p></li></ul><p>Other·configuration·parameters·exist,·to·be·used·for·customizing·the·overload162 disk_log·sync.</p></li></ul><p>Other·configuration·parameters·exist,·to·be·used·for·customizing·the·overload
163 protection·behaviour.·The·same·parameters·are·used·both·in·the·standard·handler163 protection·behaviour.·The·same·parameters·are·used·both·in·the·standard·handler
164 and·the·disk_log·handler,·and·are·documented·in·the164 and·the·disk_log·handler,·and·are·documented·in·the
165 <a·href="logger_chapter.html#overload_protection"><code·class="inline">User's·Guide</code></a>.</p><p>Notice·that·when·changing·the·configuration·of·the·handler·in·runtime,·the165 <a·href="logger_chapter.html#overload_protection"><code·class="inline">User's·Guide</code></a>.</p><p>Notice·that·when·changing·the·configuration·of·the·handler·in·runtime,·the
166 disk_log·options·(<code·class="inline">file</code>,·<code·class="inline">type</code>,·<code·class="inline">max_no_files</code>,·<code·class="inline">max_no_bytes</code>)·must·not·be166 disk_log·options·(<code·class="inline">file</code>,·<code·class="inline">type</code>,·<code·class="inline">max_no_files</code>,·<code·class="inline">max_no_bytes</code>)·must·not·be
167 modified.</p><p>Example·of·adding·a·disk_log·handler:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="5456510922-1">(</span><span·class="ss">my_disk_log_h</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_disk_log_h</span><span·class="p">,</span><span·class="w">167 modified.</p><p>Example·of·adding·a·disk_log·handler:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="8554312805-1">(</span><span·class="ss">my_disk_log_h</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_disk_log_h</span><span·class="p">,</span><span·class="w">
168 ···················</span><span·class="p"·data-group-id="5456510922-2">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5456510922-3">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;./my_disk_log&quot;</span><span·class="p">,</span><span·class="w">168 ···················</span><span·class="p"·data-group-id="8554312805-2">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8554312805-3">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;./my_disk_log&quot;</span><span·class="p">,</span><span·class="w">
169 ·································</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">wrap</span><span·class="p">,</span><span·class="w">169 ·································</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">wrap</span><span·class="p">,</span><span·class="w">
170 ·································</span><span·class="ss">max_no_files</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">170 ·································</span><span·class="ss">max_no_files</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">
171 ·································</span><span·class="ss">max_no_bytes</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">10000</span><span·class="p">,</span><span·class="w">171 ·································</span><span·class="ss">max_no_bytes</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">10000</span><span·class="p">,</span><span·class="w">
172 ·································</span><span·class="ss">filesync_repeat_interval</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1000</span><span·class="p"·data-group-id="5456510922-3">}</span><span·class="p"·data-group-id="5456510922-2">}</span><span·class="p"·data-group-id="5456510922-1">)</span><span·class="p">.</span></code></pre><p>To·use·the·disk_log·handler·instead·of·the·default·standard·handler·when172 ·································</span><span·class="ss">filesync_repeat_interval</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1000</span><span·class="p"·data-group-id="8554312805-3">}</span><span·class="p"·data-group-id="8554312805-2">}</span><span·class="p"·data-group-id="8554312805-1">)</span><span·class="p">.</span></code></pre><p>To·use·the·disk_log·handler·instead·of·the·default·standard·handler·when
173 starting·an·Erlang·node,·change·the·Kernel·default·logger·to·use173 starting·an·Erlang·node,·change·the·Kernel·default·logger·to·use
174 <code·class="inline">logger_disk_log_h</code>.·Example:</p><pre><code·class="text">erl·-kernel·logger·'[{handler,default,logger_disk_log_h,174 <code·class="inline">logger_disk_log_h</code>.·Example:</p><pre><code·class="text">erl·-kernel·logger·'[{handler,default,logger_disk_log_h,
175 ······················#{config·=&gt;·#{file·=&gt;·&quot;./system_disk_log&quot;}}}]'</code></pre><h2·id="module-see-also"·class="section-heading">175 ······················#{config·=&gt;·#{file·=&gt;·&quot;./system_disk_log&quot;}}}]'</code></pre><h2·id="module-see-also"·class="section-heading">
176 ··<a·href="#module-see-also"·class="hover-link">176 ··<a·href="#module-see-also"·class="hover-link">
177 ····<i·class="ri-link-m"·aria-hidden="true"></i>177 ····<i·class="ri-link-m"·aria-hidden="true"></i>
178 ··</a>178 ··</a>
179 ··<span·class="text">See·Also</span>179 ··<span·class="text">See·Also</span>
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269 ······<p·class="built-using">269 ······<p·class="built-using">
270 ········Built·using270 ········Built·using
271 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the271 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
272 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>272 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
273 ······</p>273 ······</p>
274 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>274 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
275 ····</footer>275 ····</footer>
276 ··</div>276 ··</div>
277 </main>277 </main>
278 </div>278 </div>
279 <script>279 <script>
280 ··function·mermaidLoaded()·{280 ··function·mermaidLoaded()·{
281 ····mermaid.initialize({281 ····mermaid.initialize({
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245 ······</div>245 ······</div>
  
246 <p>This·filter·provides·a·way·of·filtering·log·events·based·on·a·<code·class="inline">domain</code>·field·in246 <p>This·filter·provides·a·way·of·filtering·log·events·based·on·a·<code·class="inline">domain</code>·field·in
247 <code·class="inline">Metadata</code>.·This·field·is·optional,·and·the·purpose·of·using·it·is·to·group·log247 <code·class="inline">Metadata</code>.·This·field·is·optional,·and·the·purpose·of·using·it·is·to·group·log
248 events·from,·for·example,·a·specific·functional·area.·This·allows·filtering·or248 events·from,·for·example,·a·specific·functional·area.·This·allows·filtering·or
249 other·specialized·treatment·in·a·Logger·handler.</p><p>A·domain·field·must·be·a·list·of·atoms,·creating·smaller·and·more·specialized249 other·specialized·treatment·in·a·Logger·handler.</p><p>A·domain·field·must·be·a·list·of·atoms,·creating·smaller·and·more·specialized
250 domains·as·the·list·grows·longer.·The·greatest·domain·is·<code·class="inline">[]</code>,·which·comprises250 domains·as·the·list·grows·longer.·The·greatest·domain·is·<code·class="inline">[]</code>,·which·comprises
251 all·possible·domains.</p><p>For·example,·consider·the·following·domains:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">D1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4304327237-1">[</span><span·class="ss">otp</span><span·class="p"·data-group-id="4304327237-1">]</span><span·class="w">251 all·possible·domains.</p><p>For·example,·consider·the·following·domains:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">D1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4271696039-1">[</span><span·class="ss">otp</span><span·class="p"·data-group-id="4271696039-1">]</span><span·class="w">
252 </span><span·class="n">D2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4304327237-2">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sasl</span><span·class="p"·data-group-id="4304327237-2">]</span></code></pre><p><code·class="inline">D1</code>·is·the·greatest·of·the·two,·and·is·said·to·be·a·super-domain·of·<code·class="inline">D2</code>.·<code·class="inline">D2</code>252 </span><span·class="n">D2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4271696039-2">[</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sasl</span><span·class="p"·data-group-id="4271696039-2">]</span></code></pre><p><code·class="inline">D1</code>·is·the·greatest·of·the·two,·and·is·said·to·be·a·super-domain·of·<code·class="inline">D2</code>.·<code·class="inline">D2</code>
253 is·a·sub-domain·<code·class="inline">D1</code>.·Both·<code·class="inline">D1</code>·and·<code·class="inline">D2</code>·are·sub-domains·of·<code·class="inline">[]</code>.</p><p>The·above·domains·are·used·for·logs·originating·from·Erlang/OTP.·D1·specifies253 is·a·sub-domain·<code·class="inline">D1</code>.·Both·<code·class="inline">D1</code>·and·<code·class="inline">D2</code>·are·sub-domains·of·<code·class="inline">[]</code>.</p><p>The·above·domains·are·used·for·logs·originating·from·Erlang/OTP.·D1·specifies
254 that·the·log·event·comes·from·Erlang/OTP·in·general,·and·D2·indicates·that·the254 that·the·log·event·comes·from·Erlang/OTP·in·general,·and·D2·indicates·that·the
255 log·event·is·a·so·called·<a·href="logger_chapter.html#sasl_reports">SASL·report</a>.</p><p>The·<code·class="inline">Extra</code>·parameter·to·the·<a·href="#domain/2"><code·class="inline">domain/2</code></a>·function·is·specified·when255 log·event·is·a·so·called·<a·href="logger_chapter.html#sasl_reports">SASL·report</a>.</p><p>The·<code·class="inline">Extra</code>·parameter·to·the·<a·href="#domain/2"><code·class="inline">domain/2</code></a>·function·is·specified·when
256 adding·the·filter·via·<a·href="logger.html#add_primary_filter/2"><code·class="inline">logger:add_primary_filter/2</code></a>·or256 adding·the·filter·via·<a·href="logger.html#add_primary_filter/2"><code·class="inline">logger:add_primary_filter/2</code></a>·or
257 <a·href="logger.html#add_handler_filter/3"><code·class="inline">logger:add_handler_filter/3</code></a>.</p><p>The·filter·compares·the·value·of·the·<code·class="inline">domain</code>·field·in·the·log·event's·metadata257 <a·href="logger.html#add_handler_filter/3"><code·class="inline">logger:add_handler_filter/3</code></a>.</p><p>The·filter·compares·the·value·of·the·<code·class="inline">domain</code>·field·in·the·log·event's·metadata
258 (<code·class="inline">Domain</code>)·against·<code·class="inline">MatchDomain</code>.·The·filter·matches·if·the·value·of·<code·class="inline">Compare</code>258 (<code·class="inline">Domain</code>)·against·<code·class="inline">MatchDomain</code>.·The·filter·matches·if·the·value·of·<code·class="inline">Compare</code>
259 is:</p><ul><li><p><strong><code·class="inline">sub</code></strong>·-·and·<code·class="inline">Domain</code>·is·equal·to·or·a·sub-domain·of·<code·class="inline">MatchDomain</code>,·that259 is:</p><ul><li><p><strong><code·class="inline">sub</code></strong>·-·and·<code·class="inline">Domain</code>·is·equal·to·or·a·sub-domain·of·<code·class="inline">MatchDomain</code>,·that
260 is,·if·<code·class="inline">MatchDomain</code>·is·a·prefix·of·<code·class="inline">Domain</code>.</p></li><li><p><strong><code·class="inline">super</code></strong>·-·and·<code·class="inline">Domain</code>·is·equal·to·or·a·super-domain·of·<code·class="inline">MatchDomain</code>,260 is,·if·<code·class="inline">MatchDomain</code>·is·a·prefix·of·<code·class="inline">Domain</code>.</p></li><li><p><strong><code·class="inline">super</code></strong>·-·and·<code·class="inline">Domain</code>·is·equal·to·or·a·super-domain·of·<code·class="inline">MatchDomain</code>,
261 that·is,·if·<code·class="inline">Domain</code>·is·a·prefix·of·<code·class="inline">MatchDomain</code>.</p></li><li><p><strong><code·class="inline">equal</code></strong>·-·and·<code·class="inline">Domain</code>·is·equal·to·<code·class="inline">MatchDomain</code>.</p></li><li><p><strong><code·class="inline">not_equal</code></strong>·-·and·<code·class="inline">Domain</code>·differs·from·<code·class="inline">MatchDomain</code>,·or·if·there·is·no261 that·is,·if·<code·class="inline">Domain</code>·is·a·prefix·of·<code·class="inline">MatchDomain</code>.</p></li><li><p><strong><code·class="inline">equal</code></strong>·-·and·<code·class="inline">Domain</code>·is·equal·to·<code·class="inline">MatchDomain</code>.</p></li><li><p><strong><code·class="inline">not_equal</code></strong>·-·and·<code·class="inline">Domain</code>·differs·from·<code·class="inline">MatchDomain</code>,·or·if·there·is·no
262 domain·field·in·metadata.</p></li><li><p><strong><code·class="inline">undefined</code></strong>·-·and·there·is·no·domain·field·in·metadata.·In·this·case262 domain·field·in·metadata.</p></li><li><p><strong><code·class="inline">undefined</code></strong>·-·and·there·is·no·domain·field·in·metadata.·In·this·case
263 <code·class="inline">MatchDomain</code>·must·be·set·to·<code·class="inline">[]</code>.</p></li></ul><p>If·the·filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">log</code>,·the·log·event·is·allowed.·If·the263 <code·class="inline">MatchDomain</code>·must·be·set·to·<code·class="inline">[]</code>.</p></li></ul><p>If·the·filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">log</code>,·the·log·event·is·allowed.·If·the
264 filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">stop</code>,·the·log·event·is·stopped.</p><p>If·the·filter·does·not·match,·it·returns·<code·class="inline">ignore</code>,·meaning·that·other·filters,264 filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">stop</code>,·the·log·event·is·stopped.</p><p>If·the·filter·does·not·match,·it·returns·<code·class="inline">ignore</code>,·meaning·that·other·filters,
265 or·the·value·of·the·configuration·parameter·<code·class="inline">filter_default</code>,·decide·if·the265 or·the·value·of·the·configuration·parameter·<code·class="inline">filter_default</code>,·decide·if·the
266 event·is·allowed·or·not.</p><p>Log·events·that·do·not·contain·any·domain·field,·match·only·when·<code·class="inline">Compare</code>·is266 event·is·allowed·or·not.</p><p>Log·events·that·do·not·contain·any·domain·field,·match·only·when·<code·class="inline">Compare</code>·is
267 equal·to·<code·class="inline">undefined</code>·or·<code·class="inline">not_equal</code>.</p><p>Example:·stop·all·events·with·domain·<code·class="inline">[otp,·sasl·|·_]</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="1288896160-1">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">filter_default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">log</span><span·class="p"·data-group-id="1288896160-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·this·is·the·default</span><span·class="w">267 equal·to·<code·class="inline">undefined</code>·or·<code·class="inline">not_equal</code>.</p><p>Example:·stop·all·events·with·domain·<code·class="inline">[otp,·sasl·|·_]</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="6763044231-1">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">filter_default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">log</span><span·class="p"·data-group-id="6763044231-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·this·is·the·default</span><span·class="w">
268 </span><span·class="ss">ok</span><span·class="gp·unselectable">268 </span><span·class="ss">ok</span><span·class="gp·unselectable">
269 2&gt;·</span><span·class="n">Filter</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1288896160-2">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·512,·SHA:·b3096957d4ddb7e2e3d76fbf3578499e907a1d535144f78f172262077dbfaa7b·...·]-2">}</span><span·class="p">.</span><span·class="w">269 2&gt;·</span><span·class="n">Filter</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6763044231-2">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">domain</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·512,·SHA:·15ad9472734a1b4b4302b031b510983a051c3e298298da8393ad45f4e44e55bb·...·]-2">}</span><span·class="p">.</span><span·class="w">
270 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">270 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
271 3&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler_filter</span><span·class="p"·data-group-id="1288896160-5">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">no_sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filter</span><span·class="p"·data-group-id="1288896160-5">)</span><span·class="p">.</span><span·class="w">271 3&gt;·</span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler_filter</span><span·class="p"·data-group-id="6763044231-5">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">no_sasl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filter</span><span·class="p"·data-group-id="6763044231-5">)</span><span·class="p">.</span><span·class="w">
272 </span><span·class="ss">ok</span></code></pre>272 </span><span·class="ss">ok</span></code></pre>
273 ··</section>273 ··</section>
274 </section>274 </section>
275 <section·class="detail"·id="level/2">275 <section·class="detail"·id="level/2">
  
276 ··<div·class="detail-header">276 ··<div·class="detail-header">
277 ····<a·href="#level/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">277 ····<a·href="#level/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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308 matches·log·events·by·comparing·the·log·level·with·a·specified·<code·class="inline">MatchLevel</code></p><p>The·<code·class="inline">Extra</code>·parameter·is·specified·when·adding·the·filter·via308 matches·log·events·by·comparing·the·log·level·with·a·specified·<code·class="inline">MatchLevel</code></p><p>The·<code·class="inline">Extra</code>·parameter·is·specified·when·adding·the·filter·via
309 <a·href="logger.html#add_primary_filter/2"><code·class="inline">logger:add_primary_filter/2</code></a>·or·<a·href="logger.html#add_handler_filter/3"><code·class="inline">logger:add_handler_filter/3</code></a>.</p><p>The·filter·compares·the·value·of·the·event's·log·level·(<code·class="inline">Level</code>)·to·<code·class="inline">MatchLevel</code>309 <a·href="logger.html#add_primary_filter/2"><code·class="inline">logger:add_primary_filter/2</code></a>·or·<a·href="logger.html#add_handler_filter/3"><code·class="inline">logger:add_handler_filter/3</code></a>.</p><p>The·filter·compares·the·value·of·the·event's·log·level·(<code·class="inline">Level</code>)·to·<code·class="inline">MatchLevel</code>
310 by·calling310 by·calling
311 <a·href="logger.html#compare_levels/2"><code·class="inline">logger:compare_levels(Level,·MatchLevel)</code></a>.·The311 <a·href="logger.html#compare_levels/2"><code·class="inline">logger:compare_levels(Level,·MatchLevel)</code></a>.·The
312 filter·matches·if·the·value·of·<code·class="inline">Operator</code>·is:</p><ul><li><p><strong><code·class="inline">neq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">lt</code>·or·<code·class="inline">gt</code>.</p></li><li><p><strong><code·class="inline">eq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">eq</code>.</p></li><li><p><strong><code·class="inline">lt</code></strong>·-·and·the·compare·function·returns·<code·class="inline">lt</code>.</p></li><li><p><strong><code·class="inline">gt</code></strong>·-·and·the·compare·function·returns·<code·class="inline">gt</code>.</p></li><li><p><strong><code·class="inline">lteq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">lt</code>·or·<code·class="inline">eq</code>.</p></li><li><p><strong><code·class="inline">gteq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">gt</code>·or·<code·class="inline">eq</code>.</p></li></ul><p>If·the·filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">log</code>,·the·log·event·is·allowed.·If·the312 filter·matches·if·the·value·of·<code·class="inline">Operator</code>·is:</p><ul><li><p><strong><code·class="inline">neq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">lt</code>·or·<code·class="inline">gt</code>.</p></li><li><p><strong><code·class="inline">eq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">eq</code>.</p></li><li><p><strong><code·class="inline">lt</code></strong>·-·and·the·compare·function·returns·<code·class="inline">lt</code>.</p></li><li><p><strong><code·class="inline">gt</code></strong>·-·and·the·compare·function·returns·<code·class="inline">gt</code>.</p></li><li><p><strong><code·class="inline">lteq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">lt</code>·or·<code·class="inline">eq</code>.</p></li><li><p><strong><code·class="inline">gteq</code></strong>·-·and·the·compare·function·returns·<code·class="inline">gt</code>·or·<code·class="inline">eq</code>.</p></li></ul><p>If·the·filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">log</code>,·the·log·event·is·allowed.·If·the
313 filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">stop</code>,·the·log·event·is·stopped.</p><p>If·the·filter·does·not·match,·it·returns·<code·class="inline">ignore</code>,·meaning·that·other·filters,313 filter·matches·and·<code·class="inline">Action</code>·is·<code·class="inline">stop</code>,·the·log·event·is·stopped.</p><p>If·the·filter·does·not·match,·it·returns·<code·class="inline">ignore</code>,·meaning·that·other·filters,
314 or·the·value·of·the·configuration·parameter·<code·class="inline">filter_default</code>,·will·decide·if·the314 or·the·value·of·the·configuration·parameter·<code·class="inline">filter_default</code>,·will·decide·if·the
315 event·is·allowed·or·not.</p><p>Example:·only·allow·debug·level·log·events</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="0553817217-1">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">filter_default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="0553817217-1">)</span><span·class="p">.</span><span·class="w">315 event·is·allowed·or·not.</p><p>Example:·only·allow·debug·level·log·events</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">set_handler_config</span><span·class="p"·data-group-id="9710789372-1">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">filter_default</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="9710789372-1">)</span><span·class="p">.</span><span·class="w">
316 </span><span·class="n">Filter</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0553817217-2">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">level</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·329,·SHA:·99cb4f87e6c6905367643027ab38167d9a808481b69d5937f066c07f3b3c44b9·...·]-2">}</span><span·class="p">.</span><span·class="w">316 </span><span·class="n">Filter</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9710789372-2">{</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">logger_filters</span><span·class="p">:</span><span·class="ss">level</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·329,·SHA:·3383bf41aeb9d23c572ba3affd74c242b1271aaf834000651117e4e712bc5bee·...·]-2">}</span><span·class="p">.</span><span·class="w">
317 </span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler_filter</span><span·class="p"·data-group-id="0553817217-4">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug_only</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filter</span><span·class="p"·data-group-id="0553817217-4">)</span><span·class="p">.</span><span·class="w">317 </span><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler_filter</span><span·class="p"·data-group-id="9710789372-4">(</span><span·class="ss">h1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug_only</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filter</span><span·class="p"·data-group-id="9710789372-4">)</span><span·class="p">.</span><span·class="w">
318 </span><span·class="ss">ok</span></code></pre>318 </span><span·class="ss">ok</span></code></pre>
319 ··</section>319 ··</section>
320 </section>320 </section>
321 <section·class="detail"·id="progress/2">321 <section·class="detail"·id="progress/2">
  
322 ··<div·class="detail-header">322 ··<div·class="detail-header">
323 ····<a·href="#progress/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">323 ····<a·href="#progress/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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402 ······<p·class="built-using">402 ······<p·class="built-using">
403 ········Built·using403 ········Built·using
404 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the404 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
405 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>405 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
406 ······</p>406 ······</p>
407 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>407 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
408 ····</footer>408 ····</footer>
409 ··</div>409 ··</div>
410 </main>410 </main>
411 </div>411 </div>
412 <script>412 <script>
413 ··function·mermaidLoaded()·{413 ··function·mermaidLoaded()·{
414 ····mermaid.initialize({414 ····mermaid.initialize({
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607 ······<p·class="built-using">607 ······<p·class="built-using">
608 ········Built·using608 ········Built·using
609 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the609 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
610 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>610 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
611 ······</p>611 ······</p>
612 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>612 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
613 ····</footer>613 ····</footer>
614 ··</div>614 ··</div>
615 </main>615 </main>
616 </div>616 </div>
617 <script>617 <script>
618 ··function·mermaidLoaded()·{618 ··function·mermaidLoaded()·{
619 ····mermaid.initialize({619 ····mermaid.initialize({
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581 ········Built·using581 ········Built·using
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583 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>583 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
584 ······</p>584 ······</p>
585 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>585 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
586 ····</footer>586 ····</footer>
587 ··</div>587 ··</div>
588 </main>588 </main>
589 </div>589 </div>
590 <script>590 <script>
591 ··function·mermaidLoaded()·{591 ··function·mermaidLoaded()·{
592 ····mermaid.initialize({592 ····mermaid.initialize({
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181 but·only·performs·a·new·sync·if·something·has·actually·been·logged.</p><p>If·<code·class="inline">no_repeat</code>·is·set·as·value,·the·repeated·file·sync·operation·is·disabled,181 but·only·performs·a·new·sync·if·something·has·actually·been·logged.</p><p>If·<code·class="inline">no_repeat</code>·is·set·as·value,·the·repeated·file·sync·operation·is·disabled,
182 and·it·is·the·operating·system·settings·that·determine·how·quickly·or·slowly182 and·it·is·the·operating·system·settings·that·determine·how·quickly·or·slowly
183 data·is·written·to·disk.·The·user·can·also·call·the·<a·href="#filesync/1"><code·class="inline">filesync/1</code></a>·function·to183 data·is·written·to·disk.·The·user·can·also·call·the·<a·href="#filesync/1"><code·class="inline">filesync/1</code></a>·function·to
184 perform·a·file·sync.</p><p>Defaults·to·<code·class="inline">5000</code>·milliseconds.</p></li></ul><p>Other·configuration·parameters·exist,·to·be·used·for·customizing·the·overload184 perform·a·file·sync.</p><p>Defaults·to·<code·class="inline">5000</code>·milliseconds.</p></li></ul><p>Other·configuration·parameters·exist,·to·be·used·for·customizing·the·overload
185 protection·behaviour.·The·same·parameters·are·used·both·in·the·standard·handler185 protection·behaviour.·The·same·parameters·are·used·both·in·the·standard·handler
186 and·the·disk_log·handler,·and·are·documented·in·the186 and·the·disk_log·handler,·and·are·documented·in·the
187 <a·href="logger_chapter.html#overload_protection"><code·class="inline">User's·Guide</code></a>.</p><p>Notice·that·if·changing·the·configuration·of·the·handler·in·runtime,·the·<code·class="inline">type</code>,187 <a·href="logger_chapter.html#overload_protection"><code·class="inline">User's·Guide</code></a>.</p><p>Notice·that·if·changing·the·configuration·of·the·handler·in·runtime,·the·<code·class="inline">type</code>,
188 <code·class="inline">file</code>,·or·<code·class="inline">modes</code>·parameters·must·not·be·modified.</p><p>Example·of·adding·a·standard·handler:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="7267109609-1">(</span><span·class="ss">my_standard_h</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">188 <code·class="inline">file</code>,·or·<code·class="inline">modes</code>·parameters·must·not·be·modified.</p><p>Example·of·adding·a·standard·handler:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">logger</span><span·class="p">:</span><span·class="nf">add_handler</span><span·class="p"·data-group-id="8376648216-1">(</span><span·class="ss">my_standard_h</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">logger_std_h</span><span·class="p">,</span><span·class="w">
189 ···················</span><span·class="p"·data-group-id="7267109609-2">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7267109609-3">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;./system_info.log&quot;</span><span·class="p">,</span><span·class="w">189 ···················</span><span·class="p"·data-group-id="8376648216-2">#{</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8376648216-3">#{</span><span·class="ss">file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;./system_info.log&quot;</span><span·class="p">,</span><span·class="w">
190 ·································</span><span·class="ss">filesync_repeat_interval</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1000</span><span·class="p"·data-group-id="7267109609-3">}</span><span·class="p"·data-group-id="7267109609-2">}</span><span·class="p"·data-group-id="7267109609-1">)</span><span·class="p">.</span></code></pre><p>To·set·the·default·handler,·that·starts·initially·with·the·Kernel·application,190 ·································</span><span·class="ss">filesync_repeat_interval</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1000</span><span·class="p"·data-group-id="8376648216-3">}</span><span·class="p"·data-group-id="8376648216-2">}</span><span·class="p"·data-group-id="8376648216-1">)</span><span·class="p">.</span></code></pre><p>To·set·the·default·handler,·that·starts·initially·with·the·Kernel·application,
191 to·log·to·file·instead·of·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#t:standard_io/0"><code·class="inline">standard_io</code></a>,·change·the191 to·log·to·file·instead·of·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#t:standard_io/0"><code·class="inline">standard_io</code></a>,·change·the
192 Kernel·default·logger·configuration.·Example:</p><pre><code·class="text">erl·-kernel·logger·'[{handler,default,logger_std_h,192 Kernel·default·logger·configuration.·Example:</p><pre><code·class="text">erl·-kernel·logger·'[{handler,default,logger_std_h,
193 ······················#{config·=&gt;·#{file·=&gt;·&quot;./log.log&quot;}}}]'</code></pre><p>An·example·of·how·to·replace·the·standard·handler·with·a·disk_log·handler·at193 ······················#{config·=&gt;·#{file·=&gt;·&quot;./log.log&quot;}}}]'</code></pre><p>An·example·of·how·to·replace·the·standard·handler·with·a·disk_log·handler·at
194 startup·is·found·in·the·<a·href="logger_disk_log_h.html"><code·class="inline">logger_disk_log_h</code></a>·manual.</p><h2·id="module-see-also"·class="section-heading">194 startup·is·found·in·the·<a·href="logger_disk_log_h.html"><code·class="inline">logger_disk_log_h</code></a>·manual.</p><h2·id="module-see-also"·class="section-heading">
195 ··<a·href="#module-see-also"·class="hover-link">195 ··<a·href="#module-see-also"·class="hover-link">
196 ····<i·class="ri-link-m"·aria-hidden="true"></i>196 ····<i·class="ri-link-m"·aria-hidden="true"></i>
197 ··</a>197 ··</a>
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289 ········Built·using289 ········Built·using
290 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the290 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
291 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>291 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
292 ······</p>292 ······</p>
293 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>293 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
294 ····</footer>294 ····</footer>
295 ··</div>295 ··</div>
296 </main>296 </main>
297 </div>297 </div>
298 <script>298 <script>
299 ··function·mermaidLoaded()·{299 ··function·mermaidLoaded()·{
300 ····mermaid.initialize({300 ····mermaid.initialize({
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553 ··········<pre·translate="no"><span·class="attribute">-type</span>·ifaddrs_filter_fun()·::·fun((<a·href="#t:ifaddrs/0">ifaddrs</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()).</pre>553 ··········<pre·translate="no"><span·class="attribute">-type</span>·ifaddrs_filter_fun()·::·fun((<a·href="#t:ifaddrs/0">ifaddrs</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()).</pre>
  
554 ······</div>554 ······</div>
  
555 <p>Interface·address·filtering·selector·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:function/0"><code·class="inline">function/0</code></a>.</p><p>For·each·<code·class="inline">ifaddrs</code>·entry,·return·either·<code·class="inline">true</code>·to·keep·the·entry555 <p>Interface·address·filtering·selector·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:function/0"><code·class="inline">function/0</code></a>.</p><p>For·each·<code·class="inline">ifaddrs</code>·entry,·return·either·<code·class="inline">true</code>·to·keep·the·entry
556 or·<code·class="inline">false</code>·to·discard·the·entry.</p><p>For·example,·to·get·an·interface·list·which·only·contains556 or·<code·class="inline">false</code>·to·discard·the·entry.</p><p>For·example,·to·get·an·interface·list·which·only·contains
557 non-<code·class="inline">loopback</code>·<code·class="inline">inet</code>·interfaces:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">net</span><span·class="p">:</span><span·class="nf">getifaddrs</span><span·class="p"·data-group-id="9411353093-1">(</span><span·class="w">557 non-<code·class="inline">loopback</code>·<code·class="inline">inet</code>·interfaces:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">net</span><span·class="p">:</span><span·class="nf">getifaddrs</span><span·class="p"·data-group-id="2322090874-1">(</span><span·class="w">
558 ····</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9411353093-2">(</span><span·class="p"·data-group-id="9411353093-3">#{</span><span·class="w">·</span><span·class="ss">addr</span><span·class="w">··</span><span·class="p">:=</span><span·class="w">·</span><span·class="p"·data-group-id="9411353093-4">#{</span>[·...·truncated·by·diffoscope;·len:·172,·SHA:·6b82f4959c6a61733f4d9897235b952882032b5843bec44b4dc543acf39c50d6·...·]-4">}</span><span·class="p">,</span><span·class="w">558 ····</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="2322090874-2">(</span><span·class="p"·data-group-id="2322090874-3">#{</span><span·class="w">·</span><span·class="ss">addr</span><span·class="w">··</span><span·class="p">:=</span><span·class="w">·</span><span·class="p"·data-group-id="2322090874-4">#{</span>[·...·truncated·by·diffoscope;·len:·172,·SHA:·390389817445a4ebdf98be4e1de74ed89646d3b384c8d6a181e1043042ccf3c2·...·]-4">}</span><span·class="p">,</span><span·class="w">
559 ············</span><span·class="ss">flags</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Flags</span><span·class="p"·data-group-id="9411353093-3">}</span><span·class="p"·data-group-id="9411353093-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">559 ············</span><span·class="ss">flags</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Flags</span><span·class="p"·data-group-id="2322090874-3">}</span><span·class="p"·data-group-id="2322090874-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
560 ··········</span><span·class="ow">not</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="9411353093-5">(</span><span·class="ss">loopback</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Flags</span><span·class="p"·data-group-id="9411353093-5">)</span><span·class="p">;</span><span·class="w">560 ··········</span><span·class="ow">not</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="2322090874-5">(</span><span·class="ss">loopback</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Flags</span><span·class="p"·data-group-id="2322090874-5">)</span><span·class="p">;</span><span·class="w">
561 ········</span><span·class="p"·data-group-id="9411353093-6">(</span><span·class="p">_</span><span·class="p"·data-group-id="9411353093-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">561 ········</span><span·class="p"·data-group-id="2322090874-6">(</span><span·class="p">_</span><span·class="p"·data-group-id="2322090874-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
562 ··········</span><span·class="ss">false</span><span·class="w">562 ··········</span><span·class="ss">false</span><span·class="w">
563 ····</span><span·class="k">end</span><span·class="p"·data-group-id="9411353093-1">)</span><span·class="p">.</span></code></pre>563 ····</span><span·class="k">end</span><span·class="p"·data-group-id="2322090874-1">)</span><span·class="p">.</span></code></pre>
564 ··</section>564 ··</section>
565 </section>565 </section>
566 <section·class="detail"·id="t:ifaddrs_filter_map/0">566 <section·class="detail"·id="t:ifaddrs_filter_map/0">
  
567 ··<div·class="detail-header">567 ··<div·class="detail-header">
568 ····<a·href="#t:ifaddrs_filter_map/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">568 ····<a·href="#t:ifaddrs_filter_map/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">
569 ······<i·class="ri-link-m"·aria-hidden="true"></i>569 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1350 ······<p·class="built-using">1350 ······<p·class="built-using">
1351 ········Built·using1351 ········Built·using
1352 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1352 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1353 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1353 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1354 ······</p>1354 ······</p>
1355 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1355 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1356 ····</footer>1356 ····</footer>
1357 ··</div>1357 ··</div>
1358 </main>1358 </main>
1359 </div>1359 </div>
1360 <script>1360 <script>
1361 ··function·mermaidLoaded()·{1361 ··function·mermaidLoaded()·{
1362 ····mermaid.initialize({1362 ····mermaid.initialize({
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475 ···················Name·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),475 ···················Name·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
476 ···················Port·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),476 ···················Port·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),
477 ···················Reason·::·address·|·<a·href="file.html#t:posix/0">file:posix</a>().</pre>477 ···················Reason·::·address·|·<a·href="file.html#t:posix/0">file:posix</a>().</pre>
  
478 ······</div>478 ······</div>
  
479 <p>Returns·the·names·and·associated·port·numbers·of·the·Erlang·nodes·that·<code·class="inline">epmd</code>479 <p>Returns·the·names·and·associated·port·numbers·of·the·Erlang·nodes·that·<code·class="inline">epmd</code>
480 registered·at·the·specified·host.</p><p>Similar·to·<code·class="inline">epmd·-names</code>,·see·<a·href="../../../../erts-15.2.6/doc/html/epmd_cmd.html"><code·class="inline">erts:epmd</code></a>.</p><p>Returns·<code·class="inline">{error,·address}</code>·if·<code·class="inline">epmd</code>·is·not·operational.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(arne@dunn)1&gt;·</span><span·class="nc">net_adm</span><span·class="p">:</span><span·class="nf">names</span><span·class="p"·data-group-id="5972946535-1">(</span><span·class="p"·data-group-id="5972946535-1">)</span><span·class="p">.</span><span·class="w">480 registered·at·the·specified·host.</p><p>Similar·to·<code·class="inline">epmd·-names</code>,·see·<a·href="../../../../erts-15.2.6/doc/html/epmd_cmd.html"><code·class="inline">erts:epmd</code></a>.</p><p>Returns·<code·class="inline">{error,·address}</code>·if·<code·class="inline">epmd</code>·is·not·operational.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(arne@dunn)1&gt;·</span><span·class="nc">net_adm</span><span·class="p">:</span><span·class="nf">names</span><span·class="p"·data-group-id="4363196775-1">(</span><span·class="p"·data-group-id="4363196775-1">)</span><span·class="p">.</span><span·class="w">
481 </span><span·class="p"·data-group-id="5972946535-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5972946535-3">[</span><span·class="p"·data-group-id="5972946535-4">{</span><span·class="s">&quot;arne&quot;</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·160,·SHA:·75a191142dd84d6eb3b34c95c1534aed431bf4f2717571a202f2d4860d86d3f8·...·]5-2">}</span></code></pre>481 </span><span·class="p"·data-group-id="4363196775-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4363196775-3">[</span><span·class="p"·data-group-id="4363196775-4">{</span><span·class="s">&quot;arne&quot;</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·160,·SHA:·879a24800eefb61da208c2378415a319b0e766da82b2cb6d077a4c2245309372·...·]5-2">}</span></code></pre>
482 ··</section>482 ··</section>
483 </section>483 </section>
484 <section·class="detail"·id="ping/1">484 <section·class="detail"·id="ping/1">
  
485 ··<div·class="detail-header">485 ··<div·class="detail-header">
486 ····<a·href="#ping/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">486 ····<a·href="#ping/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
487 ······<i·class="ri-link-m"·aria-hidden="true"></i>487 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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642 ······<p·class="built-using">642 ······<p·class="built-using">
643 ········Built·using643 ········Built·using
644 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the644 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
645 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>645 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
646 ······</p>646 ······</p>
647 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>647 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
648 ····</footer>648 ····</footer>
649 ··</div>649 ··</div>
650 </main>650 </main>
651 </div>651 </div>
652 <script>652 <script>
653 ··function·mermaidLoaded()·{653 ··function·mermaidLoaded()·{
654 ····mermaid.initialize({654 ····mermaid.initialize({
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128 ····<section·id="moduledoc">128 ····<section·id="moduledoc">
129 <p>Erlang·networking·kernel.</p><p>The·net·kernel·is·a·system·process,·registered·as·<code·class="inline">net_kernel</code>,·which·must·be129 <p>Erlang·networking·kernel.</p><p>The·net·kernel·is·a·system·process,·registered·as·<code·class="inline">net_kernel</code>,·which·must·be
130 operational·for·distributed·Erlang·to·work.·The·purpose·of·this·process·is·to130 operational·for·distributed·Erlang·to·work.·The·purpose·of·this·process·is·to
131 implement·parts·of·the·BIFs·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#spawn/4"><code·class="inline">spawn/4</code></a>·and131 implement·parts·of·the·BIFs·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#spawn/4"><code·class="inline">spawn/4</code></a>·and
132 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#spawn_link/4"><code·class="inline">spawn_link/4</code></a>,·and·to·provide·monitoring·of·the·network.</p><p>An·Erlang·node·is·started·using·command-line·flag·<code·class="inline">-name</code>·or·<code·class="inline">-sname</code>:</p><pre><code·class="text">$·erl·-sname·foobar</code></pre><p>It·is·also·possible·to·call·<a·href="#start/2"><code·class="inline">net_kernel:start(foobar,·#{})</code></a>132 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#spawn_link/4"><code·class="inline">spawn_link/4</code></a>,·and·to·provide·monitoring·of·the·network.</p><p>An·Erlang·node·is·started·using·command-line·flag·<code·class="inline">-name</code>·or·<code·class="inline">-sname</code>:</p><pre><code·class="text">$·erl·-sname·foobar</code></pre><p>It·is·also·possible·to·call·<a·href="#start/2"><code·class="inline">net_kernel:start(foobar,·#{})</code></a>
133 directly·from·the·normal·Erlang·shell·prompt:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">net_kernel</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2769332507-1">(</span><span·class="ss">foobar</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2769332507-2">#{</span><span·class="ss">name_domain</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w"[·...·truncated·by·diffoscope;·len:·136,·SHA:·e86827074d2c118777dd59922ca6ce87d51acd72185b471465f6ec8af6330ba4·...·]7-1">)</span><span·class="p">.</span><span·class="w">133 directly·from·the·normal·Erlang·shell·prompt:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">net_kernel</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4356916527-1">(</span><span·class="ss">foobar</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4356916527-2">#{</span><span·class="ss">name_domain</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w"[·...·truncated·by·diffoscope;·len:·136,·SHA:·a93665f4cb259ed0290f29e566f80cf1e4c1879be7050eb34c7bdc293fa3727e·...·]7-1">)</span><span·class="p">.</span><span·class="w">
134 </span><span·class="p"·data-group-id="2769332507-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.64</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2769332507-3">}</span><span·class="w">134 </span><span·class="p"·data-group-id="4356916527-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.64</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="4356916527-3">}</span><span·class="w">
135 </span><span·class="p"·data-group-id="2769332507-4">(</span><span·class="ss">foobar@gringotts</span><span·class="p"·data-group-id="2769332507-4">)</span><span·class="mi">2</span><span·class="o">&gt;</span></code></pre><p>If·the·node·is·started·with·command-line·flag·<code·class="inline">-sname</code>,·the·node·name·is135 </span><span·class="p"·data-group-id="4356916527-4">(</span><span·class="ss">foobar@gringotts</span><span·class="p"·data-group-id="4356916527-4">)</span><span·class="mi">2</span><span·class="o">&gt;</span></code></pre><p>If·the·node·is·started·with·command-line·flag·<code·class="inline">-sname</code>,·the·node·name·is
136 <code·class="inline">foobar@Host</code>,·where·<code·class="inline">Host</code>·is·the·short·name·of·the·host·(not·the·fully136 <code·class="inline">foobar@Host</code>,·where·<code·class="inline">Host</code>·is·the·short·name·of·the·host·(not·the·fully
137 qualified·domain·name).·If·started·with·flag·<code·class="inline">-name</code>,·the·node·name·is137 qualified·domain·name).·If·started·with·flag·<code·class="inline">-name</code>,·the·node·name·is
138 <code·class="inline">foobar@Host</code>,·where·<code·class="inline">Host</code>·is·the·fully·qualified·domain·name.·For·more138 <code·class="inline">foobar@Host</code>,·where·<code·class="inline">Host</code>·is·the·fully·qualified·domain·name.·For·more
139 information,·see·<a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html"><code·class="inline">erl</code></a>.</p><p>Normally,·connections·are·established·automatically·when·another·node·is139 information,·see·<a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html"><code·class="inline">erl</code></a>.</p><p>Normally,·connections·are·established·automatically·when·another·node·is
140 referenced.·This·functionality·can·be·disabled·by·setting·Kernel·configuration140 referenced.·This·functionality·can·be·disabled·by·setting·Kernel·configuration
141 parameter·<code·class="inline">dist_auto_connect</code>·to·<code·class="inline">never</code>,·see·<a·href="kernel_app.html"><code·class="inline">kernel(6)</code></a>.·In141 parameter·<code·class="inline">dist_auto_connect</code>·to·<code·class="inline">never</code>,·see·<a·href="kernel_app.html"><code·class="inline">kernel(6)</code></a>.·In
142 this·case,·connections·must·be·established·explicitly·by·calling142 this·case,·connections·must·be·established·explicitly·by·calling
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646 node·through·the·newly·established·connection.</li><li><code·class="inline">nodedown</code>·messages·are·delivered·after·all·the·signals·from·the·remote·node646 node·through·the·newly·established·connection.</li><li><code·class="inline">nodedown</code>·messages·are·delivered·after·all·the·signals·from·the·remote·node
647 over·the·connection·have·been·delivered.</li><li><code·class="inline">nodeup</code>·messages·are·delivered·after·the·corresponding·node·appears·in647 over·the·connection·have·been·delivered.</li><li><code·class="inline">nodeup</code>·messages·are·delivered·after·the·corresponding·node·appears·in
648 results·from·<code·class="inline">erlang:nodes()</code>.</li><li><code·class="inline">nodedown</code>·messages·are·delivered·after·the·corresponding·node·has·disappeared648 results·from·<code·class="inline">erlang:nodes()</code>.</li><li><code·class="inline">nodedown</code>·messages·are·delivered·after·the·corresponding·node·has·disappeared
649 in·results·from·<code·class="inline">erlang:nodes()</code>.</li><li>As·of·OTP·23.0,·a·<code·class="inline">nodedown</code>·message·for·a·connection·being·taken·down·will·be649 in·results·from·<code·class="inline">erlang:nodes()</code>.</li><li>As·of·OTP·23.0,·a·<code·class="inline">nodedown</code>·message·for·a·connection·being·taken·down·will·be
650 delivered·before·a·<code·class="inline">nodeup</code>·message·due·to·a·new·connection·to·the·same·node.650 delivered·before·a·<code·class="inline">nodeup</code>·message·due·to·a·new·connection·to·the·same·node.
651 Prior·to·OTP·23.0,·this·was·not·guaranteed·to·be·the·case.</li></ul><p>The·format·of·the·node·status·change·messages·depends·on·<code·class="inline">Options</code>.·If·<code·class="inline">Options</code>651 Prior·to·OTP·23.0,·this·was·not·guaranteed·to·be·the·case.</li></ul><p>The·format·of·the·node·status·change·messages·depends·on·<code·class="inline">Options</code>.·If·<code·class="inline">Options</code>
652 is·the·empty·list·or·if·<a·href="#monitor_nodes/1"><code·class="inline">net_kernel:monitor_nodes/1</code></a>·is·called,·the·format·is·as652 is·the·empty·list·or·if·<a·href="#monitor_nodes/1"><code·class="inline">net_kernel:monitor_nodes/1</code></a>·is·called,·the·format·is·as
653 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7046912443-1">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="7046912443-1">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·197,·SHA:·46a2c22827c58bb3b83d36e04d5919843d9916adb8b299f34ae0a7130c19dedc·...·]-2">}</span><span·class="w">653 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2453137361-1">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="2453137361-1">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·197,·SHA:·2ae108476c6b45aa2eb4ae9feef95e312396f1a76f925d352c3a5c3e2d792c12·...·]-2">}</span><span·class="w">
654 ··</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="7046912443-3">(</span><span·class="p"·data-group-id="7046912443-3">)</span></code></pre><p>When·<code·class="inline">Options</code>·is·the·empty·map·or·empty·list,·the·caller·will·only·subscribe654 ··</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="2453137361-3">(</span><span·class="p"·data-group-id="2453137361-3">)</span></code></pre><p>When·<code·class="inline">Options</code>·is·the·empty·map·or·empty·list,·the·caller·will·only·subscribe
655 for·status·change·messages·for·visible·nodes.·That·is,·only·nodes·that·appear·in655 for·status·change·messages·for·visible·nodes.·That·is,·only·nodes·that·appear·in
656 the·result·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#nodes/0"><code·class="inline">erlang:nodes/0</code></a>.</p><p>If·<code·class="inline">Options</code>·equals·anything·other·than·the·empty·list,·the·format·of·the·status656 the·result·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#nodes/0"><code·class="inline">erlang:nodes/0</code></a>.</p><p>If·<code·class="inline">Options</code>·equals·anything·other·than·the·empty·list,·the·format·of·the·status
657 change·messages·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0275920497-1">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="0275920497-1">}</span><[·...·truncated·by·diffoscope;·len:·347,·SHA:·c97a45b27342e035f9601835dadea59c898729721cd44f358568a9ff5f76b7b2·...·]-2">}</span><span·class="w">657 change·messages·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4093987495-1">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="4093987495-1">}</span><[·...·truncated·by·diffoscope;·len:·347,·SHA:·c1b5198868cafc0e73590a756da5858036a15a9d10363f3e1b82bda8535e1472·...·]-2">}</span><span·class="w">
658 ··</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="0275920497-3">(</span><span·class="p"·data-group-id="0275920497-3">)</span><span·class="w">658 ··</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="4093987495-3">(</span><span·class="p"·data-group-id="4093987495-3">)</span><span·class="w">
659 ··</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0275920497-4">#{</span><span·class="n">Tag</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="0275920497-4">}</span><span·class="w">·</span><span·class="p">|</span><spa[·...·truncated·by·diffoscope;·len:·320,·SHA:·fddc60412820d1985d19aab11bb8ffe45f63612bcaf3ea99332f17f607f79ec0·...·]-5">]</span></code></pre><p><code·class="inline">Info</code>·is·either·a·map·or·a·list·of·2-tuples.·Its·content·depends·on·<code·class="inline">Options</code>.659 ··</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4093987495-4">#{</span><span·class="n">Tag</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="4093987495-4">}</span><span·class="w">·</span><span·class="p">|</span><spa[·...·truncated·by·diffoscope;·len:·320,·SHA:·57d897fa0e35dab0b7c76813208b43b86549fd62860db7adac560590c8b48646·...·]-5">]</span></code></pre><p><code·class="inline">Info</code>·is·either·a·map·or·a·list·of·2-tuples.·Its·content·depends·on·<code·class="inline">Options</code>.
660 If·<code·class="inline">Options</code>·is·a·map,·<code·class="inline">Info</code>·will·also·be·a·map.·If·<code·class="inline">Options</code>·is·a·list,·<code·class="inline">Info</code>660 If·<code·class="inline">Options</code>·is·a·map,·<code·class="inline">Info</code>·will·also·be·a·map.·If·<code·class="inline">Options</code>·is·a·list,·<code·class="inline">Info</code>
661 will·also·be·a·list.</p><p>When·<code·class="inline">Options</code>·is·a·map,·currently·the·following·associations·are·allowed:</p><ul><li><p><strong><code·class="inline">connection_id·=&gt;·boolean()</code></strong>·-·If·the·value·of·the·association·equals661 will·also·be·a·list.</p><p>When·<code·class="inline">Options</code>·is·a·map,·currently·the·following·associations·are·allowed:</p><ul><li><p><strong><code·class="inline">connection_id·=&gt;·boolean()</code></strong>·-·If·the·value·of·the·association·equals
662 <code·class="inline">true</code>,·a·<code·class="inline">connection_id·=&gt;·ConnectionId</code>·association·will·be·included·in·the662 <code·class="inline">true</code>,·a·<code·class="inline">connection_id·=&gt;·ConnectionId</code>·association·will·be·included·in·the
663 <code·class="inline">Info</code>·map·where·<code·class="inline">ConnectionId</code>·is·the·connection·identifier·of·the·connection663 <code·class="inline">Info</code>·map·where·<code·class="inline">ConnectionId</code>·is·the·connection·identifier·of·the·connection
664 coming·up·or·going·down.·For·more·info·about·this·connection·identifier·see664 coming·up·or·going·down.·For·more·info·about·this·connection·identifier·see
665 the·documentation·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#connection_id">erlang:nodes/2</a>.</p></li><li><p><strong><code·class="inline">node_type·=&gt;·NodeType</code></strong>·-·Valid·values·for·<code·class="inline">NodeType</code>:</p><ul><li><p><strong><code·class="inline">visible</code></strong>·-·Subscribe·to·node·status·change·messages·for·visible·nodes665 the·documentation·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#connection_id">erlang:nodes/2</a>.</p></li><li><p><strong><code·class="inline">node_type·=&gt;·NodeType</code></strong>·-·Valid·values·for·<code·class="inline">NodeType</code>:</p><ul><li><p><strong><code·class="inline">visible</code></strong>·-·Subscribe·to·node·status·change·messages·for·visible·nodes
666 only.·The·association·<code·class="inline">node_type·=&gt;·visible</code>·will·be·included·in·the·<code·class="inline">Info</code>666 only.·The·association·<code·class="inline">node_type·=&gt;·visible</code>·will·be·included·in·the·<code·class="inline">Info</code>
Offset 686, 31 lines modifiedOffset 686, 31 lines modified
686 only.·The·tuple·<code·class="inline">{node_type,·hidden}</code>·will·be·included·in·the·<code·class="inline">Info</code>·list.</p></li><li><p><strong><code·class="inline">all</code></strong>·-·Subscribe·to·node·status·change·messages·for·both·visible·and686 only.·The·tuple·<code·class="inline">{node_type,·hidden}</code>·will·be·included·in·the·<code·class="inline">Info</code>·list.</p></li><li><p><strong><code·class="inline">all</code></strong>·-·Subscribe·to·node·status·change·messages·for·both·visible·and
687 hidden·nodes.·The·tuple·<code·class="inline">{node_type,·visible·|·hidden}</code>·will·be·included·in687 hidden·nodes.·The·tuple·<code·class="inline">{node_type,·visible·|·hidden}</code>·will·be·included·in
688 the·<code·class="inline">Info</code>·list.</p></li></ul><p>If·no·<code·class="inline">{node_type,·NodeType}</code>·option·has·been·given.·The·caller·will·subscribe688 the·<code·class="inline">Info</code>·list.</p></li></ul><p>If·no·<code·class="inline">{node_type,·NodeType}</code>·option·has·been·given.·The·caller·will·subscribe
689 for·status·change·messages·for·visible·nodes·only,·but·<em>no</em>689 for·status·change·messages·for·visible·nodes·only,·but·<em>no</em>
690 <code·class="inline">{node_type,·visible}</code>·tuple·will·be·included·in·the·<code·class="inline">Info</code>·list.</p></li><li><p><strong><code·class="inline">nodedown_reason</code></strong>·-·The·tuple·<code·class="inline">{nodedown_reason,·Reason}</code>·will·be·included690 <code·class="inline">{node_type,·visible}</code>·tuple·will·be·included·in·the·<code·class="inline">Info</code>·list.</p></li><li><p><strong><code·class="inline">nodedown_reason</code></strong>·-·The·tuple·<code·class="inline">{nodedown_reason,·Reason}</code>·will·be·included
691 in·the·<code·class="inline">Info</code>·list·for·<code·class="inline">nodedown</code>·messages.</p><p>See·the·documentation·of·the691 in·the·<code·class="inline">Info</code>·list·for·<code·class="inline">nodedown</code>·messages.</p><p>See·the·documentation·of·the
692 <a·href="net_kernel.html#nodedown_reasons"><code·class="inline">nodedown_reason·=&gt;·boolean()</code></a>·association692 <a·href="net_kernel.html#nodedown_reasons"><code·class="inline">nodedown_reason·=&gt;·boolean()</code></a>·association
693 above·for·information·about·possible·<code·class="inline">Reason</code>·values.</p></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(a@localhost)1&gt;·</span><span·class="nc">net_kernel</span><span·class="p">:</span><span·class="nf">monitor_nodes</span><span·class="p"·data-group-id="6883221729-1">(</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6883221729-2">#{</span><span·class="ss">connection_id</span><span·class="p">=&gt;</span><span·class="ss">true</span><span·class[·...·truncated·by·diffoscope;·len:·362,·SHA:·5973c65e36bf69328754bdba0326e3bf09bd3270f9e540cd8ad93a67cba8e9de·...·]-1">)</span><span·class="p">.</span><span·class="w">693 above·for·information·about·possible·<code·class="inline">Reason</code>·values.</p></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(a@localhost)1&gt;·</span><span·class="nc">net_kernel</span><span·class="p">:</span><span·class="nf">monitor_nodes</span><span·class="p"·data-group-id="8506031932-1">(</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8506031932-2">#{</span><span·class="ss">connection_id</span><span·class="p">=&gt;</span><span·class="ss">true</span><span·class[·...·truncated·by·diffoscope;·len:·362,·SHA:·208f5efadb9700f228b9c911121c7d373b5fcecb21b7b88cab60a8f9426c2498·...·]-1">)</span><span·class="p">.</span><span·class="w">
694 </span><span·class="nf">ok</span><span·class="w">694 </span><span·class="nf">ok</span><span·class="w">
695 </span><span·class="p"·data-group-id="6883221729-3">(</span><span·class="ss">a@localhost</span><span·class="p"·data-group-id="6883221729-3">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">flush</span><span·class="p"·data-group-id="6883221729[·...·truncated·by·diffoscope;·len:·53,·SHA:·28655dac1378b14aa83138d8467d4f852392f93671b8dbe326f17e5acae759da·...·]-4">)</span><span·class="p">.</span><span·class="w">695 </span><span·class="p"·data-group-id="8506031932-3">(</span><span·class="ss">a@localhost</span><span·class="p"·data-group-id="8506031932-3">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">flush</span><span·class="p"·data-group-id="8506031932[·...·truncated·by·diffoscope;·len:·53,·SHA:·ffed4286e3d2ff0879c99c2e821ec61e278b4b6e7e57e30a0ca73c4100917e41·...·]-4">)</span><span·class="p">.</span><span·class="w">
696 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="6883221729-5">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="ss">b@localhost</span><span·class="p">,</span><span·class="w">696 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="8506031932-5">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="ss">b@localhost</span><span·class="p">,</span><span·class="w">
697 ··················</span><span·class="p"·data-group-id="6883221729-6">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">3067552</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·169,·SHA:·dd24c49d5a9b4e4d31209a93413eb4a22dc254354aec7e1729b3188db2612103·...·]-5">}</span><span·class="w">697 ··················</span><span·class="p"·data-group-id="8506031932-6">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">3067552</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·169,·SHA:·dd52a5398f4af07f145d735a8e105e53b2815492b1c230f0fcee4bf9647a6e7e·...·]-5">}</span><span·class="w">
698 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="6883221729-7">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="ss">c@localhost</span><span·class="p">,</span><span·class="w">698 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="8506031932-7">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="ss">c@localhost</span><span·class="p">,</span><span·class="w">
699 ··················</span><span·class="p"·data-group-id="6883221729-8">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">13892107</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·169,·SHA:·dacf928a30df285af8acf4517fd843eec82bd54a7f38cdb5b6dc06093af806ff·...·]-7">}</span><span·class="w">699 ··················</span><span·class="p"·data-group-id="8506031932-8">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">13892107</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·169,·SHA:·bc8164ddd12ebd4e9a244a05011e544941448c8fcf8f779640ebce73854db705·...·]-7">}</span><span·class="w">
700 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="6883221729-9">{</span><span·class="ss">nodedown</span><span·class="p">,</span><span·class="ss">b@localhost</span><span·class="p">,</span><span·class="w">700 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="8506031932-9">{</span><span·class="ss">nodedown</span><span·class="p">,</span><span·class="ss">b@localhost</span><span·class="p">,</span><span·class="w">
701 ····················</span><span·class="p"·data-group-id="6883221729-10">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">3067552</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">visible</span><span·class="p">,</span><span·class="w">701 ····················</span><span·class="p"·data-group-id="8506031932-10">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">3067552</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">visible</span><span·class="p">,</span><span·class="w">
702 ······················</span><span·class="ss">nodedown_reason</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">connection_closed</span><span·class="p"·data-group-id="6883221729-10">}</span><span·class="p"·data-group-id="6883221729-9">}</span><span·class="w">702 ······················</span><span·class="ss">nodedown_reason</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">connection_closed</span><span·class="p"·data-group-id="8506031932-10">}</span><span·class="p"·data-group-id="8506031932-9">}</span><span·class="w">
703 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="6883221729-11">{</span><span·class="ss">nodedown</span><span·class="p">,</span><span·class="ss">c@localhost</span><span·class="p">,</span><span·class="w">703 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="8506031932-11">{</span><span·class="ss">nodedown</span><span·class="p">,</span><span·class="ss">c@localhost</span><span·class="p">,</span><span·class="w">
704 ····················</span><span·class="p"·data-group-id="6883221729-12">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">13892107</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">hidden</span><span·class="p">,</span><span·class="w">704 ····················</span><span·class="p"·data-group-id="8506031932-12">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">13892107</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">hidden</span><span·class="p">,</span><span·class="w">
705 ······················</span><span·class="ss">nodedown_reason</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">net_tick_timeout</span><span·class="p"·data-group-id="6883221729-12">}</span><span·class="p"·data-group-id="6883221729-11">}</span><span·class="w">705 ······················</span><span·class="ss">nodedown_reason</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">net_tick_timeout</span><span·class="p"·data-group-id="8506031932-12">}</span><span·class="p"·data-group-id="8506031932-11">}</span><span·class="w">
706 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="6883221729-13">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="ss">b@localhost</span><span·class="p">,</span><span·class="w">706 </span><span·class="n">Shell</span><span·class="w">·</span><span·class="ss">got</span><span·class="w">·</span><span·class="p"·data-group-id="8506031932-13">{</span><span·class="ss">nodeup</span><span·class="p">,</span><span·class="ss">b@localhost</span><span·class="p">,</span><span·class="w">
707 ··················</span><span·class="p"·data-group-id="6883221729-14">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">3067553</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·171,·SHA:·c6cf32b29c047ed1f3366cd768da2cf80dd7b57786ec06a1f303fb3f6afcd538·...·]-13">}</span><span·class="w">707 ··················</span><span·class="p"·data-group-id="8506031932-14">#{</span><span·class="ss">connection_id</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">3067553</span><span·class="p">,</span><span·class="ss">node_type</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·171,·SHA:·989904db80160d77954941e8d71db56ca95afbcae39d8c0d134c7ce1db22c6f1·...·]-13">}</span><span·class="w">
708 </span><span·class="nf">ok</span><span·class="w">708 </span><span·class="nf">ok</span><span·class="w">
709 </span><span·class="p"·data-group-id="6883221729-15">(</span><span·class="ss">a@localhost</span><span·class="p"·data-group-id="6883221729-15">)</span><span·class="mi">3</span><span·class="o">&gt;</span></code></pre>709 </span><span·class="p"·data-group-id="8506031932-15">(</span><span·class="ss">a@localhost</span><span·class="p"·data-group-id="8506031932-15">)</span><span·class="mi">3</span><span·class="o">&gt;</span></code></pre>
710 ··</section>710 ··</section>
711 </section>711 </section>
712 <section·class="detail"·id="set_net_ticktime/1">712 <section·class="detail"·id="set_net_ticktime/1">
  
713 ··<div·class="detail-header">713 ··<div·class="detail-header">
714 ····<a·href="#set_net_ticktime/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">714 ····<a·href="#set_net_ticktime/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
715 ······<i·class="ri-link-m"·aria-hidden="true"></i>715 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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980 ······<p·class="built-using">980 ······<p·class="built-using">
981 ········Built·using981 ········Built·using
982 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the982 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
983 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>983 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
984 ······</p>984 ······</p>
985 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>985 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
986 ····</footer>986 ····</footer>
987 ··</div>987 ··</div>
988 </main>988 </main>
989 </div>989 </div>
990 <script>990 <script>
991 ··function·mermaidLoaded()·{991 ··function·mermaidLoaded()·{
992 ····mermaid.initialize({992 ····mermaid.initialize({
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4109 will·make·repeated·attempts·to·open·the·disk·log·fail·every·time.</p><p>Own·Id:·OTP-5558·Aux·Id:·seq9823</p></li><li><p>Previously·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·behaved4109 will·make·repeated·attempts·to·open·the·disk·log·fail·every·time.</p><p>Own·Id:·OTP-5558·Aux·Id:·seq9823</p></li><li><p>Previously·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·behaved
4110 completely·asynchronous.·This·had·one·undesirable·effect,·though.·You·could4110 completely·asynchronous.·This·had·one·undesirable·effect,·though.·You·could
4111 never·know·when·you·were·guaranteed·<em>not</em>·to·be·affected·by·a·link·that·you4111 never·know·when·you·were·guaranteed·<em>not</em>·to·be·affected·by·a·link·that·you
4112 had·unlinked·or·a·monitor·that·you·had·demonitored.</p><p>The·new·behavior·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·can·be4112 had·unlinked·or·a·monitor·that·you·had·demonitored.</p><p>The·new·behavior·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#unlink/1"><code·class="inline">unlink/1</code></a>·and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#demonitor/2"><code·class="inline">erlang:demonitor/2</code></a>·can·be
4113 viewed·as·two·operations·performed·atomically.·Asynchronously·send·an·unlink4113 viewed·as·two·operations·performed·atomically.·Asynchronously·send·an·unlink
4114 signal·or·a·demonitor·signal,·and·ignore·any·future·results·of·the·link·or4114 signal·or·a·demonitor·signal,·and·ignore·any·future·results·of·the·link·or
4115 monitor.</p><p><em>NOTE</em>:·This·change·can·cause·some·obscure·code·to·fail·which·previously·did4115 monitor.</p><p><em>NOTE</em>:·This·change·can·cause·some·obscure·code·to·fail·which·previously·did
4116 not.·For·example,·the·following·code·might·hang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">············</span><span·class="n">Mon</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monitor</span><span·class="p"·data-group-id="8101890024-1">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="8101890024-1">)</span><span·class="p">,</span><span·class="w">4116 not.·For·example,·the·following·code·might·hang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">············</span><span·class="n">Mon</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monitor</span><span·class="p"·data-group-id="0893490755-1">(</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="0893490755-1">)</span><span·class="p">,</span><span·class="w">
4117 ············</span><span·class="c1">%%·...</span><span·class="w">4117 ············</span><span·class="c1">%%·...</span><span·class="w">
4118 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="8101890024-2">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bang</span><span·class="p"·data-group-id="8101890024-2">)</span><span·class="p">,</span><span·class="w">4118 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="0893490755-2">(</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bang</span><span·class="p"·data-group-id="0893490755-2">)</span><span·class="p">,</span><span·class="w">
4119 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="8101890024-3">(</span><span·class="n">Mon</span><span·class="p"·data-group-id="8101890024-3">)</span><span·class="p">,</span><span·class="w">4119 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="0893490755-3">(</span><span·class="n">Mon</span><span·class="p"·data-group-id="0893490755-3">)</span><span·class="p">,</span><span·class="w">
4120 ············</span><span·class="k">receive</span><span·class="w">4120 ············</span><span·class="k">receive</span><span·class="w">
4121 ················</span><span·class="p"·data-group-id="8101890024-4">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mon</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·144,·SHA:·8ee98fba2e99e864174d3c161dc35448b8241a864ebe31a63b92c27820e50122·...·]-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">4121 ················</span><span·class="p"·data-group-id="0893490755-4">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mon</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·144,·SHA:·4ba5e102363960ca3cbe25151d5c214a0ff651402eb9c35c2b820a1d94dfd0b8·...·]-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">
4122 ············</span><span·class="c1">%%·We·were·previously·guaranteed·to·get·a·down·message</span><span·class="w">4122 ············</span><span·class="c1">%%·We·were·previously·guaranteed·to·get·a·down·message</span><span·class="w">
4123 ············</span><span·class="c1">%%·(since·we·exited·the·process·ourself),·so·we·could</span><span·class="w">4123 ············</span><span·class="c1">%%·(since·we·exited·the·process·ourself),·so·we·could</span><span·class="w">
4124 ············</span><span·class="c1">%%·in·this·case·leave·out:</span><span·class="w">4124 ············</span><span·class="c1">%%·in·this·case·leave·out:</span><span·class="w">
4125 ············</span><span·class="c1">%%·after·0·-&gt;·ok</span><span·class="w">4125 ············</span><span·class="c1">%%·after·0·-&gt;·ok</span><span·class="w">
4126 ············</span><span·class="k">end</span><span·class="p">,</span></code></pre><p>*<strong>·POTENTIAL·INCOMPATIBILITY·*</strong></p><p>Own·Id:·OTP-5772</p></li><li><p>The·behavior·when·an·application·fails·to·start·and·possibly·causes·the4126 ············</span><span·class="k">end</span><span·class="p">,</span></code></pre><p>*<strong>·POTENTIAL·INCOMPATIBILITY·*</strong></p><p>Own·Id:·OTP-5772</p></li><li><p>The·behavior·when·an·application·fails·to·start·and·possibly·causes·the
4127 runtime·system·to·halt·has·been·cleaned·up,·including·fixing·some·minor·bugs.</p><p><code·class="inline">application_controller</code>·should·now·always·terminate·with·a·non-nested·string,4127 runtime·system·to·halt·has·been·cleaned·up,·including·fixing·some·minor·bugs.</p><p><code·class="inline">application_controller</code>·should·now·always·terminate·with·a·non-nested·string,
4128 meaning·the·slogan·in·an·<code·class="inline">erl_crash.dump</code>·should·always·be·easy·to·read.</p><p><code·class="inline">init</code>·now·makes·sure·that·the·slogan·passed·to·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#halt/1"><code·class="inline">erlang:halt/1</code></a>·does·not4128 meaning·the·slogan·in·an·<code·class="inline">erl_crash.dump</code>·should·always·be·easy·to·read.</p><p><code·class="inline">init</code>·now·makes·sure·that·the·slogan·passed·to·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#halt/1"><code·class="inline">erlang:halt/1</code></a>·does·not
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4541 ······<p·class="built-using">4541 ······<p·class="built-using">
4542 ········Built·using4542 ········Built·using
4543 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the4543 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
4544 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>4544 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
4545 ······</p>4545 ······</p>
4546 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>4546 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
4547 ····</footer>4547 ····</footer>
4548 ··</div>4548 ··</div>
4549 </main>4549 </main>
4550 </div>4550 </div>
4551 <script>4551 <script>
4552 ··function·mermaidLoaded()·{4552 ··function·mermaidLoaded()·{
4553 ····mermaid.initialize({4553 ····mermaid.initialize({
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640 ··········<pre·translate="no"><span·class="attribute">-spec</span>·cmd(Command,·Options)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·when·Command·::·<a·href="#t:os_command/0">os_command</a>(),·Options·::·<a·href="#t:os_command_opts/0">os_command_opts</a>().</pre>640 ··········<pre·translate="no"><span·class="attribute">-spec</span>·cmd(Command,·Options)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·when·Command·::·<a·href="#t:os_command/0">os_command</a>(),·Options·::·<a·href="#t:os_command_opts/0">os_command_opts</a>().</pre>
  
641 ······</div>641 ······</div>
  
642 <p>Executes·<code·class="inline">Command</code>·in·a·command·shell·of·the·target·OS,·captures·the·standard642 <p>Executes·<code·class="inline">Command</code>·in·a·command·shell·of·the·target·OS,·captures·the·standard
643 output·and·standard·error·of·the·command,·and·returns·this·result·as·a·string.</p><p>The·command·shell·can·be·set·using·the643 output·and·standard·error·of·the·command,·and·returns·this·result·as·a·string.</p><p>The·command·shell·can·be·set·using·the
644 <a·href="kernel_app.html#os_cmd_shell">kernel·configuration·parameter</a>,·by·default·the644 <a·href="kernel_app.html#os_cmd_shell">kernel·configuration·parameter</a>,·by·default·the
645 shell·is·detected·upon·system·startup.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">LsOut</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="2652077941-1">(</span><span·class="s">&quot;ls&quot;</span><span·class="p"·data-group-id="2652077941-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·on·unix·platform</span><span·class="w">645 shell·is·detected·upon·system·startup.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">LsOut</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="6305246966-1">(</span><span·class="s">&quot;ls&quot;</span><span·class="p"·data-group-id="6305246966-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·on·unix·platform</span><span·class="w">
646 </span><span·class="n">DirOut</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="2652077941-2">(</span><span·class="s">&quot;dir&quot;</span><span·class="p"·data-group-id="2652077941-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·on·Win32·platform</span></code></pre><p>Notice·that·in·some·cases,·standard·output·of·a·command·when·called·from·another646 </span><span·class="n">DirOut</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="6305246966-2">(</span><span·class="s">&quot;dir&quot;</span><span·class="p"·data-group-id="6305246966-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·on·Win32·platform</span></code></pre><p>Notice·that·in·some·cases,·standard·output·of·a·command·when·called·from·another
647 program·can·differ,·compared·with·the·standard·output·of·the·command·when·called647 program·can·differ,·compared·with·the·standard·output·of·the·command·when·called
648 directly·from·an·OS·command·shell.</p><p>The·possible·options·are:</p><ul><li><p><strong><code·class="inline">max_size</code></strong>·-·The·maximum·size·of·the·data·returned·by·the·<code·class="inline">os:cmd</code>·call.648 directly·from·an·OS·command·shell.</p><p>The·possible·options·are:</p><ul><li><p><strong><code·class="inline">max_size</code></strong>·-·The·maximum·size·of·the·data·returned·by·the·<code·class="inline">os:cmd</code>·call.
649 This·option·is·a·safety·feature·that·should·be·used·when·the·command·executed649 This·option·is·a·safety·feature·that·should·be·used·when·the·command·executed
650 can·return·a·very·large,·possibly·infinite,·result.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="3146275282-1">(</span><span·class="s">&quot;cat·/dev/zero&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3146275282-2">#{</span><span·class="w">·</span><span·class="ss">max_size</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·192,·SHA:·f8642969b07162e38b2009586c252544a4195bd775ae6666ea7f00bf50381830·...·]-1">)</span><span·class="p">.</span><span·class="w">650 can·return·a·very·large,·possibly·infinite,·result.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="5035931057-1">(</span><span·class="s">&quot;cat·/dev/zero&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5035931057-2">#{</span><span·class="w">·</span><span·class="ss">max_size</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·192,·SHA:·5225ef6c4e9d4f4207285f63057f8269bba413ba80b3fb05a7d822fb2df1bb59·...·]-1">)</span><span·class="p">.</span><span·class="w">
651 </span><span·class="p"·data-group-id="3146275282-3">[</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·763,·SHA:·c0d054840cdb187181070fe442317bf1e57f1e4ff8e88353028c0540b6014704·...·]-3">]</span></code></pre></li></ul>651 </span><span·class="p"·data-group-id="5035931057-3">[</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·763,·SHA:·d63c9bc64f44a5b0568bf763264c8e1ef3cf378b3b553399e5292b1740eae753·...·]-3">]</span></code></pre></li></ul>
652 ··</section>652 ··</section>
653 </section>653 </section>
654 <section·class="detail"·id="env/0">654 <section·class="detail"·id="env/0">
  
655 ··<div·class="detail-header">655 ··<div·class="detail-header">
656 ····<a·href="#env/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">656 ····<a·href="#env/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
657 ······<i·class="ri-link-m"·aria-hidden="true"></i>657 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 918, 15 lines modifiedOffset 918, 15 lines modified
  
918 ······</div>918 ······</div>
  
919 <p>Returns·a·performance·counter·that·can·be·used·as·a·very·fast·and·high919 <p>Returns·a·performance·counter·that·can·be·used·as·a·very·fast·and·high
920 resolution·timestamp.</p><p>This·counter·is·read·directly·from·the·hardware·or·operating·system·with·the920 resolution·timestamp.</p><p>This·counter·is·read·directly·from·the·hardware·or·operating·system·with·the
921 same·guarantees.·This·means·that·two·consecutive·calls·to·the·function·are·not921 same·guarantees.·This·means·that·two·consecutive·calls·to·the·function·are·not
922 guaranteed·to·be·monotonic,·though·it·most·likely·will·be.·The·performance922 guaranteed·to·be·monotonic,·though·it·most·likely·will·be.·The·performance
923 counter·will·be·converted·to·the·resolution·passed·as·an·argument.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">T1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">perf_counter</span><span·class="p"·data-group-id="7065144103-1">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="7065144103-1">)</span><span·class="p">,</span><span·class="k">receive</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">10000<[·...·truncated·by·diffoscope;·len:·486,·SHA:·ea6bc2ee7fffc26881d807e3ffafcdf49ef20ee2f6c5bf3fa05b252d84fefdf2·...·]3-2">)</span><span·class="p">.</span><span·class="w">923 counter·will·be·converted·to·the·resolution·passed·as·an·argument.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">T1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">perf_counter</span><span·class="p"·data-group-id="8891419513-1">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="8891419513-1">)</span><span·class="p">,</span><span·class="k">receive</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">10000<[·...·truncated·by·diffoscope;·len:·486,·SHA:·a29115b366f2ae8c84a63bd1610f0fb27ce338f26729e2d5b4127e11161c2526·...·]3-2">)</span><span·class="p">.</span><span·class="w">
924 </span><span·class="mi">176525861</span><span·class="gp·unselectable">924 </span><span·class="mi">176525861</span><span·class="gp·unselectable">
925 2&gt;·</span><span·class="n">T2</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="n">T1</span><span·class="p">.</span><span·class="w">925 2&gt;·</span><span·class="n">T2</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="n">T1</span><span·class="p">.</span><span·class="w">
926 </span><span·class="mi">10004</span></code></pre>926 </span><span·class="mi">10004</span></code></pre>
927 ··</section>927 ··</section>
928 </section>928 </section>
929 <section·class="detail"·id="putenv/2">929 <section·class="detail"·id="putenv/2">
  
Offset 1079, 24 lines modifiedOffset 1079, 24 lines modified
1079 <p>Returns·the·current·<a·href="../../../../erts-15.2.6/doc/html/time_correction.html#os-system-time">OS·system·time</a>1079 <p>Returns·the·current·<a·href="../../../../erts-15.2.6/doc/html/time_correction.html#os-system-time">OS·system·time</a>
1080 in·the·same·format·as·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#timestamp/0"><code·class="inline">erlang:timestamp/0</code></a>.</p><p>The·tuple·can·be·used·together·with·function·<a·href="../../../../lib/stdlib-6.2.2/doc/html/calendar.html#now_to_universal_time/1"><code·class="inline">calendar:now_to_universal_time/1</code></a>1080 in·the·same·format·as·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#timestamp/0"><code·class="inline">erlang:timestamp/0</code></a>.</p><p>The·tuple·can·be·used·together·with·function·<a·href="../../../../lib/stdlib-6.2.2/doc/html/calendar.html#now_to_universal_time/1"><code·class="inline">calendar:now_to_universal_time/1</code></a>
1081 or·<a·href="../../../../lib/stdlib-6.2.2/doc/html/calendar.html#now_to_local_time/1"><code·class="inline">calendar:now_to_local_time/1</code></a>·to·get·calendar·time.·Using·the·calendar·time,1081 or·<a·href="../../../../lib/stdlib-6.2.2/doc/html/calendar.html#now_to_local_time/1"><code·class="inline">calendar:now_to_local_time/1</code></a>·to·get·calendar·time.·Using·the·calendar·time,
1082 together·with·the·<code·class="inline">MicroSecs</code>·part·of·the·return·tuple·from·this·function,1082 together·with·the·<code·class="inline">MicroSecs</code>·part·of·the·return·tuple·from·this·function,
1083 allows·you·to·log·time·stamps·in·high·resolution·and·consistent·with·the·time·in1083 allows·you·to·log·time·stamps·in·high·resolution·and·consistent·with·the·time·in
1084 ·the·rest·of·the·OS.</p><p>Example·of·code·formatting·a·string·in·format·&quot;DD·Mon·YYYY·HH:MM:SS.mmmmmm&quot;,1084 ·the·rest·of·the·OS.</p><p>Example·of·code·formatting·a·string·in·format·&quot;DD·Mon·YYYY·HH:MM:SS.mmmmmm&quot;,
1085 where·DD·is·the·day·of·month,·Mon·is·the·textual·month·name,·YYYY·is·the·year,1085 where·DD·is·the·day·of·month,·Mon·is·the·textual·month·name,·YYYY·is·the·year,
1086 HH:MM:SS·is·the·time,·and·mmmmmm·is·the·microseconds·in·six·positions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7263102487-1">(</span><span·class="ss">print_time</span><span·class="p"·data-group-id="7263102487-1">)</span><span·class="p">.</span><span·class="w">1086 HH:MM:SS·is·the·time,·and·mmmmmm·is·the·microseconds·in·six·positions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2117447413-1">(</span><span·class="ss">print_time</span><span·class="p"·data-group-id="2117447413-1">)</span><span·class="p">.</span><span·class="w">
1087 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7263102487-2">(</span><span·class="p"·data-group-id="7263102487-3">[</span><span·class="ss">format_utc_timestamp</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="7263102487-3">]</span><span·class="p"·data-group-id="7263[·...·truncated·by·diffoscope;·len:·6,·SHA:·23d547f93e4fc081dcf7b058f42cce4da5871aefcaa6301005726eb256028a1b·...·]-2">)</span><span·class="p">.</span><span·class="w">1087 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2117447413-2">(</span><span·class="p"·data-group-id="2117447413-3">[</span><span·class="ss">format_utc_timestamp</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2117447413-3">]</span><span·class="p"·data-group-id="2117[·...·truncated·by·diffoscope;·len:·6,·SHA:·18b18ac666f626c5f119a666de090fd253e0d720d72812d1fd43d0e42fdad0b1·...·]-2">)</span><span·class="p">.</span><span·class="w">
1088 </span><span·class="nf">format_utc_timestamp</span><span·class="p"·data-group-id="7263102487-4">(</span><span·class="p"·data-group-id="7263102487-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1088 </span><span·class="nf">format_utc_timestamp</span><span·class="p"·data-group-id="2117447413-4">(</span><span·class="p"·data-group-id="2117447413-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1089 ····</span><span·class="n">TS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7263102487-5">{</span><span·class="p">_</span><span·class="p">,</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Micro</span><span·class="p"·data-group-id="7263102487-5">}</span><span·class="w">·</span><span·class="o">=</span><span·cla[·...·truncated·by·diffoscope;·len:·192,·SHA:·60ceb89bc995e6184e97eb1592d215223e388bfd2f356d61323a922075beb867·...·]-6">)</span><span·class="p">,</span><span·class="w">1089 ····</span><span·class="n">TS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2117447413-5">{</span><span·class="p">_</span><span·class="p">,</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Micro</span><span·class="p"·data-group-id="2117447413-5">}</span><span·class="w">·</span><span·class="o">=</span><span·cla[·...·truncated·by·diffoscope;·len:·192,·SHA:·23f385dccef9e940927c8b7368c30d7e58fd17c096888f13e3b1170e148370c2·...·]-6">)</span><span·class="p">,</span><span·class="w">
1090 ····</span><span·class="p"·data-group-id="7263102487-7">{</span><span·class="p"·data-group-id="7263102487-8">{</span><span·class="n">Year</span><span·class="p">,</span><span·class="n">Month</span><span·class="p">,</span><span·class="n">Day</span><span·class="p"·data-group-id="7263102487-8">}</span[·...·truncated·by·diffoscope;·len:·305,·SHA:·8aa0d69997b19c3355cbb12a5344b2a4d818a502869a9c2516ec6d2d714c62be·...·]-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">1090 ····</span><span·class="p"·data-group-id="2117447413-7">{</span><span·class="p"·data-group-id="2117447413-8">{</span><span·class="n">Year</span><span·class="p">,</span><span·class="n">Month</span><span·class="p">,</span><span·class="n">Day</span><span·class="p"·data-group-id="2117447413-8">}</span[·...·truncated·by·diffoscope;·len:·305,·SHA:·071da41c2455ed4e54de4ee7bcdd041e3ce6fb0dee13f0b7a97b161cf0ac1f36·...·]-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
1091 </span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">now_to_universal_time</span><span·class="p"·data-group-id="7263102487-10">(</span><span·class="n">TS</span><span·class="p"·data-group-id="7263102487-10">)</span><span·class="p">,</span><span·class="w">1091 </span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">now_to_universal_time</span><span·class="p"·data-group-id="2117447413-10">(</span><span·class="n">TS</span><span·class="p"·data-group-id="2117447413-10">)</span><span·class="p">,</span><span·class="w">
1092 ····</span><span·class="n">Mstr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="7263102487-11">(</span><span·class="n">Month</span><span·class="p">,</span><span·class="p"·data-group-id="7263102487-12">{</span><span·class="s">&quot;Jan&quot;</span><span·class="p">,</span><span·class="s">&quot;Feb&quot;</span><span·class="p">,</span><span·class="s">&quot;Mar&quot;</span><span·class="p">,</span><span·class="s">&quot;Apr&quot;</span><span·class="p">,</span><span·class="s">&quot;May&quot;</span><span·class="p">,</span><span·class="s">&quot;Jun&quot;</span><span·class="p">,</span><span·class="s">&quot;Jul&quot;</span><span·class="p">,</span><span·class="w">1092 ····</span><span·class="n">Mstr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="2117447413-11">(</span><span·class="n">Month</span><span·class="p">,</span><span·class="p"·data-group-id="2117447413-12">{</span><span·class="s">&quot;Jan&quot;</span><span·class="p">,</span><span·class="s">&quot;Feb&quot;</span><span·class="p">,</span><span·class="s">&quot;Mar&quot;</span><span·class="p">,</span><span·class="s">&quot;Apr&quot;</span><span·class="p">,</span><span·class="s">&quot;May&quot;</span><span·class="p">,</span><span·class="s">&quot;Jun&quot;</span><span·class="p">,</span><span·class="s">&quot;Jul&quot;</span><span·class="p">,</span><span·class="w">
1093 ····</span><span·class="s">&quot;Aug&quot;</span><span·class="p">,</span><span·class="s">&quot;Sep&quot;</span><span·class="p">,</span><span·class="s">&quot;Oct&quot;</span><span·class="p">,</span><span·class="s">&quot;Nov&quot;</span><span·class="p">,</span><span·class="s">&quot;Dec&quot;</span><span·class="p"·data-group-id="7263102487-12">}</span><span·class="p"·data-group-id="7263102487-11">)</span><span·class="p">,</span><span·class="w">1093 ····</span><span·class="s">&quot;Aug&quot;</span><span·class="p">,</span><span·class="s">&quot;Sep&quot;</span><span·class="p">,</span><span·class="s">&quot;Oct&quot;</span><span·class="p">,</span><span·class="s">&quot;Nov&quot;</span><span·class="p">,</span><span·class="s">&quot;Dec&quot;</span><span·class="p"·data-group-id="2117447413-12">}</span><span·class="p"·data-group-id="2117447413-11">)</span><span·class="p">,</span><span·class="w">
1094 ····</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7263102487-13">(</span><span·class="s">&quot;</span><span·class="si">~2w</span><span·class="s">·</span><span·class="si">~s</span><span·class="s">·</span><span·class="si">~4w</span><span·class="s">·</span><span·class="si">~2w</span><span·class="s">:</span><span·class="si">~2..0w</span><span·class="s">:</span><span·class="si">~2..0w</span><span·class="s">.</span><span·class="si">~6..0w</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">1094 ····</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2117447413-13">(</span><span·class="s">&quot;</span><span·class="si">~2w</span><span·class="s">·</span><span·class="si">~s</span><span·class="s">·</span><span·class="si">~4w</span><span·class="s">·</span><span·class="si">~2w</span><span·class="s">:</span><span·class="si">~2..0w</span><span·class="s">:</span><span·class="si">~2..0w</span><span·class="s">.</span><span·class="si">~6..0w</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
1095 ····</span><span·class="p"·data-group-id="7263102487-14">[</span><span·class="n">Day</span><span·class="p">,</span><span·class="n">Mstr</span><span·class="p">,</span><span·class="n">Year</span><span·class="p">,</span><span·class="n">Hour</span><span·class="p">,</span><span·class="n">Minute</span><[·...·truncated·by·diffoscope;·len:·1004,·SHA:·c5958e97e926ef4778e0750c4d8eacae2b420efdfc1b46f325d7ee3b9def5208·...·]-1">)</span><span·class="p">.</span><span·class="w">1095 ····</span><span·class="p"·data-group-id="2117447413-14">[</span><span·class="n">Day</span><span·class="p">,</span><span·class="n">Mstr</span><span·class="p">,</span><span·class="n">Year</span><span·class="p">,</span><span·class="n">Hour</span><span·class="p">,</span><span·class="n">Minute</span><[·...·truncated·by·diffoscope;·len:·1004,·SHA:·ee1d9fc2541e0d3dbddeac1a1341817408b35366166a2fb23fabd80213f7e53d·...·]-1">)</span><span·class="p">.</span><span·class="w">
1096 </span><span·class="mi">29</span><span·class="w">·</span><span·class="n">Apr</span><span·class="w">·</span><span·class="mi">2009</span><span·class="w">··</span><span·class="mi">9</span><span·class="p">:</span><span·class="mi">55</span><span·class="p">:</span><span·class="mf">30.051711</span></code></pre><p>OS·system·time·can·also·be·retrieved·by·<a·href="#system_time/0"><code·class="inline">system_time/0</code></a>·and·<a·href="#system_time/1"><code·class="inline">system_time/1</code></a>.</p>1096 </span><span·class="mi">29</span><span·class="w">·</span><span·class="n">Apr</span><span·class="w">·</span><span·class="mi">2009</span><span·class="w">··</span><span·class="mi">9</span><span·class="p">:</span><span·class="mi">55</span><span·class="p">:</span><span·class="mf">30.051711</span></code></pre><p>OS·system·time·can·also·be·retrieved·by·<a·href="#system_time/0"><code·class="inline">system_time/0</code></a>·and·<a·href="#system_time/1"><code·class="inline">system_time/1</code></a>.</p>
1097 ··</section>1097 ··</section>
1098 </section>1098 </section>
1099 <section·class="detail"·id="type/0">1099 <section·class="detail"·id="type/0">
  
1100 ··<div·class="detail-header">1100 ··<div·class="detail-header">
1101 ····<a·href="#type/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1101 ····<a·href="#type/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1210, 15 lines modifiedOffset 1210, 15 lines modified
1210 ······<p·class="built-using">1210 ······<p·class="built-using">
1211 ········Built·using1211 ········Built·using
1212 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1212 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1213 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1213 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1214 ······</p>1214 ······</p>
1215 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1215 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1216 ····</footer>1216 ····</footer>
1217 ··</div>1217 ··</div>
1218 </main>1218 </main>
1219 </div>1219 </div>
1220 <script>1220 <script>
1221 ··function·mermaidLoaded()·{1221 ··function·mermaidLoaded()·{
1222 ····mermaid.initialize({1222 ····mermaid.initialize({
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836 ··········<pre·translate="no"><span·class="attribute">-spec</span>·monitor_scope(Scope·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>())·->·{<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0">reference</a>(),·#{<a·href="#t:group/0">group</a>()·=>·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pid/0">pid</a>()]}}.</pre>836 ··········<pre·translate="no"><span·class="attribute">-spec</span>·monitor_scope(Scope·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>())·->·{<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0">reference</a>(),·#{<a·href="#t:group/0">group</a>()·=>·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pid/0">pid</a>()]}}.</pre>
  
837 ······</div>837 ······</div>
  
838 <p>Subscribes·the·caller·to·updates·from·the·specified·scope.</p><p>Returns·content·of·the·entire·scope·and·a·reference·to·match·the·upcoming838 <p>Subscribes·the·caller·to·updates·from·the·specified·scope.</p><p>Returns·content·of·the·entire·scope·and·a·reference·to·match·the·upcoming
839 notifications.</p><p>Whenever·any·group·membership·changes,·an·update·message·is·sent·to·the839 notifications.</p><p>Whenever·any·group·membership·changes,·an·update·message·is·sent·to·the
840 subscriber:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0409301144-1">{</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">join</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Group</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·781,·SHA:·72c499420c2daedb7a389f179fdf4fd872ef06e166d4c713b6b790940e50a487·...·]-1">}</span></code></pre>840 subscriber:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9886638794-1">{</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">join</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Group</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·781,·SHA:·357432615b63102a1375c248f4bae230359606151153197ad03b794604bdacaa·...·]-1">}</span></code></pre>
841 ··</section>841 ··</section>
842 </section>842 </section>
843 <section·class="detail"·id="start/1">843 <section·class="detail"·id="start/1">
  
844 ··<div·class="detail-header">844 ··<div·class="detail-header">
845 ····<a·href="#start/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">845 ····<a·href="#start/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
846 ······<i·class="ri-link-m"·aria-hidden="true"></i>846 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1007, 15 lines modifiedOffset 1007, 15 lines modified
1007 ······<p·class="built-using">1007 ······<p·class="built-using">
1008 ········Built·using1008 ········Built·using
1009 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1009 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1010 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1010 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1011 ······</p>1011 ······</p>
1012 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1012 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1013 ····</footer>1013 ····</footer>
1014 ··</div>1014 ··</div>
1015 </main>1015 </main>
1016 </div>1016 </div>
1017 <script>1017 <script>
1018 ··function·mermaidLoaded()·{1018 ··function·mermaidLoaded()·{
1019 ····mermaid.initialize({1019 ····mermaid.initialize({
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1043 all·the·nodes,·but·the·multicall·is·faster,·as·all·the·requests·are·sent·at·the1043 all·the·nodes,·but·the·multicall·is·faster,·as·all·the·requests·are·sent·at·the
1044 same·time·and·are·collected·one·by·one·as·they·come·back.</p><p>The·function·evaluates·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(Module,·Function,·Args)</code></a>·on·the1044 same·time·and·are·collected·one·by·one·as·they·come·back.</p><p>The·function·evaluates·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(Module,·Function,·Args)</code></a>·on·the
1045 specified·nodes·and·collects·the·answers.·It·returns·<code·class="inline">{ResL,·BadNodes}</code>,·where1045 specified·nodes·and·collects·the·answers.·It·returns·<code·class="inline">{ResL,·BadNodes}</code>,·where
1046 <code·class="inline">BadNodes</code>·is·a·list·of·the·nodes·that·do·not·exist,·and·<code·class="inline">ResL</code>·is·a·list·of·the1046 <code·class="inline">BadNodes</code>·is·a·list·of·the·nodes·that·do·not·exist,·and·<code·class="inline">ResL</code>·is·a·list·of·the
1047 return·values,·or·<code·class="inline">{badrpc,·Reason}</code>·for·failing·calls.·<code·class="inline">Timeout</code>·is·a·time1047 return·values,·or·<code·class="inline">{badrpc,·Reason}</code>·for·failing·calls.·<code·class="inline">Timeout</code>·is·a·time
1048 (integer)·in·milliseconds,·or·<code·class="inline">infinity</code>.</p><p>The·following·example·is·useful·when·new·object·code·is·to·be·loaded·on·all1048 (integer)·in·milliseconds,·or·<code·class="inline">infinity</code>.</p><p>The·following·example·is·useful·when·new·object·code·is·to·be·loaded·on·all
1049 nodes·in·the·network,·and·indicates·some·side·effects·that·RPCs·can·produce:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Find·object·code·for·module·Mod</span><span·class="w">1049 nodes·in·the·network,·and·indicates·some·side·effects·that·RPCs·can·produce:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Find·object·code·for·module·Mod</span><span·class="w">
1050 </span><span·class="p"·data-group-id="1076151690-1">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="1076151690-1">}</span><span·[·...·truncated·by·diffoscope;·len:·277,·SHA:·d34f9fe82075a3ec6b5e884bd1c20c83ee14006bc7be56bafe71dda28283ee49·...·]-2">)</span><span·class="p">,</span><span·class="w">1050 </span><span·class="p"·data-group-id="9724990629-1">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="9724990629-1">}</span><span·[·...·truncated·by·diffoscope;·len:·277,·SHA:·c8b61ee0ddbacc456f45ed837de382af739125cdbb00703121b5de0dfbabbe3a·...·]-2">)</span><span·class="p">,</span><span·class="w">
  
1051 </span><span·class="c1">%%·and·load·it·on·all·nodes·including·this·one</span><span·class="w">1051 </span><span·class="c1">%%·and·load·it·on·all·nodes·including·this·one</span><span·class="w">
1052 </span><span·class="p"·data-group-id="1076151690-3">{</span><span·class="n">ResL</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="1076151690-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·608,·SHA:·1ef859c125ce3fe499c3a4bfb2dddb3aebe9604388826f3e922b3cbacbbdb81e·...·]-4">)</span><span·class="p">,</span><span·class="w">1052 </span><span·class="p"·data-group-id="9724990629-3">{</span><span·class="n">ResL</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="9724990629-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·608,·SHA:·9cf96be2e17d878fb3ddc537aa4e48b9f77ec92f5a13f72c852a685d4c942dc7·...·]-4">)</span><span·class="p">,</span><span·class="w">
  
1053 </span><span·class="c1">%%·and·then·maybe·check·the·ResL·list.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·you·want·the·ability·to·distinguish·between·results,·you·may·want·to1053 </span><span·class="c1">%%·and·then·maybe·check·the·ResL·list.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>If·you·want·the·ability·to·distinguish·between·results,·you·may·want·to
1054 consider·using·the·<a·href="erpc.html#multicall/4"><code·class="inline">erpc:multicall()</code></a>·function·from·the1054 consider·using·the·<a·href="erpc.html#multicall/4"><code·class="inline">erpc:multicall()</code></a>·function·from·the
1055 <code·class="inline">erpc</code>·module·instead.</p></section><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the1055 <code·class="inline">erpc</code>·module·instead.</p></section><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>You·cannot·make·<em>any</em>·assumptions·about·the·process·that·will·perform·the
1056 <code·class="inline">apply()</code>.·It·may·be·the·calling·process·itself,·an·<code·class="inline">rpc</code>·server,·another1056 <code·class="inline">apply()</code>.·It·may·be·the·calling·process·itself,·an·<code·class="inline">rpc</code>·server,·another
1057 server,·or·a·freshly·spawned·process.</p></section>1057 server,·or·a·freshly·spawned·process.</p></section>
1058 ··</section>1058 ··</section>
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1396 ······<p·class="built-using">1396 ······<p·class="built-using">
1397 ········Built·using1397 ········Built·using
1398 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1398 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1399 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1399 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1400 ······</p>1400 ······</p>
1401 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1401 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1402 ····</footer>1402 ····</footer>
1403 ··</div>1403 ··</div>
1404 </main>1404 </main>
1405 </div>1405 </div>
1406 <script>1406 <script>
1407 ··function·mermaidLoaded()·{1407 ··function·mermaidLoaded()·{
1408 ····mermaid.initialize({1408 ····mermaid.initialize({
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141 ······<p·class="built-using">141 ······<p·class="built-using">
142 ········Built·using142 ········Built·using
143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
153 ····mermaid.initialize({153 ····mermaid.initialize({
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137 of·the·trace·output.</p><h2·id="module-trace-messages-sent-to-the-system-tracer"·class="section-heading">137 of·the·trace·output.</p><h2·id="module-trace-messages-sent-to-the-system-tracer"·class="section-heading">
138 ··<a·href="#module-trace-messages-sent-to-the-system-tracer"·class="hover-link">138 ··<a·href="#module-trace-messages-sent-to-the-system-tracer"·class="hover-link">
139 ····<i·class="ri-link-m"·aria-hidden="true"></i>139 ····<i·class="ri-link-m"·aria-hidden="true"></i>
140 ··</a>140 ··</a>
141 ··<span·class="text">Trace·Messages·Sent·to·the·System·Tracer</span>141 ··<span·class="text">Trace·Messages·Sent·to·the·System·Tracer</span>
142 </h2>142 </h2>
143 <p>The·format·of·the·messages·is·one·of·the·following,·depending·on·if·flag143 <p>The·format·of·the·messages·is·one·of·the·following,·depending·on·if·flag
144 <code·class="inline">timestamp</code>·of·the·trace·token·is·set·to·<code·class="inline">true</code>·or·<code·class="inline">false</code>:</p><pre><code·class="text">{seq_trace,·Label,·SeqTraceInfo,·TimeStamp}</code></pre><p>or</p><pre><code·class="text">{seq_trace,·Label,·SeqTraceInfo}</code></pre><p>Where:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Label</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="1454047630-1">(</span><span·class="p"·data-group-id="1454047630-1">)</span><span·class="w">144 <code·class="inline">timestamp</code>·of·the·trace·token·is·set·to·<code·class="inline">true</code>·or·<code·class="inline">false</code>:</p><pre><code·class="text">{seq_trace,·Label,·SeqTraceInfo,·TimeStamp}</code></pre><p>or</p><pre><code·class="text">{seq_trace,·Label,·SeqTraceInfo}</code></pre><p>Where:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Label</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="5177748378-1">(</span><span·class="p"·data-group-id="5177748378-1">)</span><span·class="w">
145 </span><span·class="n">TimeStamp</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1454047630-2">{</span><span·class="n">Seconds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Milliseconds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Microseconds</span><span·class="p"·data-group-id="1454047[·...·truncated·by·diffoscope;·len:·3,·SHA:·21900f41ecb7b8e6cfd9250f096aad2fe7f6d8fbec9436b2d28e48c304ff8255·...·]-2">}</span><span·class="w">145 </span><span·class="n">TimeStamp</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5177748378-2">{</span><span·class="n">Seconds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Milliseconds</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Microseconds</span><span·class="p"·data-group-id="5177748[·...·truncated·by·diffoscope;·len:·3,·SHA:·21ef779311a43f0e067d0f4f600bb5451a8a7e093662086a1fe6a75d27d7892a·...·]-2">}</span><span·class="w">
146 ··</span><span·class="n">Seconds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Milliseconds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Microseconds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="1454047630-3">(</span><span·class="p"·data-group-id="1454047630-3">)</span></code></pre><p><code·class="inline">SeqTraceInfo</code>·can·have·the·following·formats:</p><ul><li><p><strong><code·class="inline">{send,·Serial,·From,·To,·Message}</code></strong>·-·Used·when·a·process·<code·class="inline">From</code>·with·its146 ··</span><span·class="n">Seconds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Milliseconds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Microseconds</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="5177748378-3">(</span><span·class="p"·data-group-id="5177748378-3">)</span></code></pre><p><code·class="inline">SeqTraceInfo</code>·can·have·the·following·formats:</p><ul><li><p><strong><code·class="inline">{send,·Serial,·From,·To,·Message}</code></strong>·-·Used·when·a·process·<code·class="inline">From</code>·with·its
147 trace·token·flag·<code·class="inline">send</code>·set·to·<code·class="inline">true</code>·has·sent·information.·<code·class="inline">To</code>·may·be·a147 trace·token·flag·<code·class="inline">send</code>·set·to·<code·class="inline">true</code>·has·sent·information.·<code·class="inline">To</code>·may·be·a
148 process·identifier,·a·registered·name·on·a·node·represented·as148 process·identifier,·a·registered·name·on·a·node·represented·as
149 <code·class="inline">{NameAtom,·NodeAtom}</code>,·or·a·node·name·represented·as·an·atom.·<code·class="inline">From</code>·may·be·a149 <code·class="inline">{NameAtom,·NodeAtom}</code>,·or·a·node·name·represented·as·an·atom.·<code·class="inline">From</code>·may·be·a
150 process·identifier·or·a·node·name·represented·as·an·atom.·<code·class="inline">Message</code>·contains150 process·identifier·or·a·node·name·represented·as·an·atom.·<code·class="inline">Message</code>·contains
151 the·information·passed·along·in·this·information·transfer.·If·the·transfer·is151 the·information·passed·along·in·this·information·transfer.·If·the·transfer·is
152 done·via·message·passing,·it·is·the·actual·message.</p></li><li><p><strong><code·class="inline">{'receive',·Serial,·From,·To,·Message}</code></strong>·-·Used·when·a·process·<code·class="inline">To</code>152 done·via·message·passing,·it·is·the·actual·message.</p></li><li><p><strong><code·class="inline">{'receive',·Serial,·From,·To,·Message}</code></strong>·-·Used·when·a·process·<code·class="inline">To</code>
153 receives·information·with·a·trace·token·that·has·flag·<code·class="inline">'receive'</code>·set·to153 receives·information·with·a·trace·token·that·has·flag·<code·class="inline">'receive'</code>·set·to
Offset 283, 76 lines modifiedOffset 283, 76 lines modified
283 from·the·sequential·tracing·point·of·view.</p><h2·id="module-example-of-use"·class="section-heading">283 from·the·sequential·tracing·point·of·view.</p><h2·id="module-example-of-use"·class="section-heading">
284 ··<a·href="#module-example-of-use"·class="hover-link">284 ··<a·href="#module-example-of-use"·class="hover-link">
285 ····<i·class="ri-link-m"·aria-hidden="true"></i>285 ····<i·class="ri-link-m"·aria-hidden="true"></i>
286 ··</a>286 ··</a>
287 ··<span·class="text">Example·of·Use</span>287 ··<span·class="text">Example·of·Use</span>
288 </h2>288 </h2>
289 <p>This·example·gives·a·rough·idea·of·how·the·new·primitives·can·be·used·and·what289 <p>This·example·gives·a·rough·idea·of·how·the·new·primitives·can·be·used·and·what
290 kind·of·output·it·produces.</p><p>Assume·that·you·have·an·initiating·process·with·<code·class="inline">Pid·==·&lt;0.30.0&gt;</code>·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0899629557-1">(</span><span·class="ss">seqex</span><span·class="p"·data-group-id="0899629557-1">)</span><span·class="p">.</span><span·class="w">290 kind·of·output·it·produces.</p><p>Assume·that·you·have·an·initiating·process·with·<code·class="inline">Pid·==·&lt;0.30.0&gt;</code>·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1433516992-1">(</span><span·class="ss">seqex</span><span·class="p"·data-group-id="1433516992-1">)</span><span·class="p">.</span><span·class="w">
291 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="0899629557-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="0899629557-2">)</span><span·class="p">.</span><span·class="w">291 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="1433516992-2">(</span><span·class="ss">export_all</span><span·class="p"·data-group-id="1433516992-2">)</span><span·class="p">.</span><span·class="w">
  
292 </span><span·class="nf">loop</span><span·class="p"·data-group-id="0899629557-3">(</span><span·class="n">Port</span><span·class="p"·data-group-id="0899629557-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">292 </span><span·class="nf">loop</span><span·class="p"·data-group-id="1433516992-3">(</span><span·class="n">Port</span><span·class="p"·data-group-id="1433516992-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
293 ····</span><span·class="k">receive</span><span·class="w">293 ····</span><span·class="k">receive</span><span·class="w">
294 ········</span><span·class="p"·data-group-id="0899629557-4">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="0899629557-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">294 ········</span><span·class="p"·data-group-id="1433516992-4">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="1433516992-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
295 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="0899629557-5">(</span><span·class="ss">label</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="0899629557-5">)</span><span·class="p">,</span><span·class="w">295 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="1433516992-5">(</span><span·class="ss">label</span><span·class="p">,</span><span·class="mi">17</span><span·class="p"·data-group-id="1433516992-5">)</span><span·class="p">,</span><span·class="w">
296 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="0899629557-6">(</span><span·class="ss">&#39;receive&#39;</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="0899629557-6">)</span><span·class="p">,</span><span·class="w">296 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="1433516992-6">(</span><span·class="ss">&#39;receive&#39;</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="1433516992-6">)</span><span·class="p">,</span><span·class="w">
297 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="0899629557-7">(</span><span·class="ss">print</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="0899629557-7">)</span><span·class="p">,</span><span·class="w">297 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="1433516992-7">(</span><span·class="ss">print</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="1433516992-7">)</span><span·class="p">,</span><span·class="w">
298 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="0899629557-8">(</span><span·class="mi">17</span><span·class="p">,</span><span·class="s">&quot;****·Trace·Started·****&quot;</span><span·class="p"·data-group-id="0899629557-8">)</span><span·class="p">,</span><span·class="w">298 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="1433516992-8">(</span><span·class="mi">17</span><span·class="p">,</span><span·class="s">&quot;****·Trace·Started·****&quot;</span><span·class="p"·data-group-id="1433516992-8">)</span><span·class="p">,</span><span·class="w">
299 ············</span><span·class="ss">call_server</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0899629557-9">{</span><span·class="nf">self</span><span·class="p"·data-group-id="0899629557-10">(</span><span·class="p"·data-group-id="0899629557-10">)</span><span·class="p">,</span><span·class="ss">the_message</span><span·class="p"·data-group-id="08996295[·...·truncated·by·diffoscope;·len:·2,·SHA:·c837649cce43f2729138e72cc315207057ac82599a59be72765a477f22d14a54·...·]-9">}</span><span·class="p">;</span><span·class="w">299 ············</span><span·class="ss">call_server</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1433516992-9">{</span><span·class="nf">self</span><span·class="p"·data-group-id="1433516992-10">(</span><span·class="p"·data-group-id="1433516992-10">)</span><span·class="p">,</span><span·class="ss">the_message</span><span·class="p"·data-group-id="14335169[·...·truncated·by·diffoscope;·len:·2,·SHA:·8241649609f88ccd2a0a5b233a07a538ec313ff6adf695aa44a969dbca39f67d·...·]-9">}</span><span·class="p">;</span><span·class="w">
300 ········</span><span·class="p"·data-group-id="0899629557-11">{</span><span·class="ss">ack</span><span·class="p">,</span><span·class="n">Ack</span><span·class="p"·data-group-id="0899629557-11">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">300 ········</span><span·class="p"·data-group-id="1433516992-11">{</span><span·class="ss">ack</span><span·class="p">,</span><span·class="n">Ack</span><span·class="p"·data-group-id="1433516992-11">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
301 ············</span><span·class="ss">ok</span><span·class="w">301 ············</span><span·class="ss">ok</span><span·class="w">
302 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">302 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
303 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="0899629557-12">(</span><span·class="n">Port</span><span·class="p"·data-group-id="0899629557-12">)</span><span·class="p">.</span></code></pre><p>And·a·registered·process·<code·class="inline">call_server</code>·with·<code·class="inline">Pid·==·&lt;0.31.0&gt;[·...·truncated·by·diffoscope;·len:·192,·SHA:·c6a59856fa6f0f2292fe23c655f3a4738f9cf8acb37b67546ef35e42e311f56d·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">303 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="1433516992-12">(</span><span·class="n">Port</span><span·class="p"·data-group-id="1433516992-12">)</span><span·class="p">.</span></code></pre><p>And·a·registered·process·<code·class="inline">call_server</code>·with·<code·class="inline">Pid·==·&lt;0.31.0&gt;[·...·truncated·by·diffoscope;·len:·192,·SHA:·3820a57b355603bae929b8eabadde6e1c835dd45c5f5c33c990449c5f8ab21d3·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
304 ····</span><span·class="k">receive</span><span·class="w">304 ····</span><span·class="k">receive</span><span·class="w">
305 ········</span><span·class="p"·data-group-id="0621407351-2">{</span><span·class="n">PortController</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="0621407351-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">305 ········</span><span·class="p"·data-group-id="5415878545-2">{</span><span·class="n">PortController</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="5415878545-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
306 ············</span><span·class="n">Ack</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0621407351-3">{</span><span·class="ss">received</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="0621407351-3">}</span><span·class="p">,</span><span·class="w">306 ············</span><span·class="n">Ack</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5415878545-3">{</span><span·class="ss">received</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Message</span><span·class="p"·data-group-id="5415878545-3">}</span><span·class="p">,</span><span·class="w">
307 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="0621407351-4">(</span><span·class="mi">17</span><span·class="p">,</span><span·class="s">&quot;We·are·here·now&quot;</span><span·class="p"·data-group-id="0621407351-4">)</span><span·class="p">,</span><span·class="w">307 ············</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="5415878545-4">(</span><span·class="mi">17</span><span·class="p">,</span><span·class="s">&quot;We·are·here·now&quot;</span><span·class="p"·data-group-id="5415878545-4">)</span><span·class="p">,</span><span·class="w">
308 ············</span><span·class="n">PortController</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="0621407351-5">{</span><span·class="ss">ack</span><span·class="p">,</span><span·class="n">Ack</span><span·class="p"·data-group-id="0621407351-5">}</span><span·class="w">308 ············</span><span·class="n">PortController</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5415878545-5">{</span><span·class="ss">ack</span><span·class="p">,</span><span·class="n">Ack</span><span·class="p"·data-group-id="5415878545-5">}</span><span·class="w">
309 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">309 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
310 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="0621407351-6">(</span><span·class="p"·data-group-id="0621407351-6">)</span><span·class="p">.</span></code></pre><p>A·possible·output·from·the·system's·<code·class="inline">sequential_tracer</code>·can·be·like·this:</p><pre><code·class="makeup·erlang"·trans[·...·truncated·by·diffoscope;·len:·434,·SHA:·3195f157ae7569641c526503df7943d4ac48a5b7707669bb47ed12c89c0229f0·...·]-1">}</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">310 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="5415878545-6">(</span><span·class="p"·data-group-id="5415878545-6">)</span><span·class="p">.</span></code></pre><p>A·possible·output·from·the·system's·<code·class="inline">sequential_tracer</code>·can·be·like·this:</p><pre><code·class="makeup·erlang"·trans[·...·truncated·by·diffoscope;·len:·434,·SHA:·198bcddb4629f59b6346e82da788924d954b2442dfd78bd027bddec2f190729d·...·]-1">}</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">
311 </span><span·class="s">&quot;****·Trace·Started·****&quot;</span><span·class="w">311 </span><span·class="s">&quot;****·Trace·Started·****&quot;</span><span·class="w">
312 </span><span·class="mi">17</span><span·class="p">:</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Received</span><span·class="w">·</span><span·class="p"·data-group-id="2293729835-2">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="2293729835-2">}</span><span·class="w">·</span><span·class="n">FROM</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.30</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">312 </span><span·class="mi">17</span><span·class="p">:</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Received</span><span·class="w">·</span><span·class="p"·data-group-id="9288759724-2">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="9288759724-2">}</span><span·class="w">·</span><span·class="n">FROM</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.30</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">
313 </span><span·class="p"·data-group-id="2293729835-3">{</span><span·class="o">&lt;</span><span·class="mf">0.30</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="ss">the_message</span><span·class="p"·data-group-id="2293729835-3">}</span><span·class="w">313 </span><span·class="p"·data-group-id="9288759724-3">{</span><span·class="o">&lt;</span><span·class="mf">0.30</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="ss">the_message</span><span·class="p"·data-group-id="9288759724-3">}</span><span·class="w">
314 </span><span·class="mi">17</span><span·class="p">:</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Info</span><span·class="w">·</span><span·class="p"·data-group-id="2293729835-4">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="2293729835-4">}</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">314 </span><span·class="mi">17</span><span·class="p">:</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Info</span><span·class="w">·</span><span·class="p"·data-group-id="9288759724-4">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9288759724-4">}</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">
315 </span><span·class="s">&quot;We·are·here·now&quot;</span><span·class="w">315 </span><span·class="s">&quot;We·are·here·now&quot;</span><span·class="w">
316 </span><span·class="mi">17</span><span·class="p">:</span><span·class="o">&lt;</span><span·class="mf">0.30</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Received</span><span·class="w">·</span><span·class="p"·data-group-id="2293729835-5">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="2293729835-5">}</span><span·class="w">·</span><span·class="n">FROM</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">316 </span><span·class="mi">17</span><span·class="p">:</span><span·class="o">&lt;</span><span·class="mf">0.30</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">Received</span><span·class="w">·</span><span·class="p"·data-group-id="9288759724-5">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="9288759724-5">}</span><span·class="w">·</span><span·class="n">FROM</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.31</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">WITH</span><span·class="w">
317 </span><span·class="p"·data-group-id="2293729835-6">{</span><span·class="ss">ack</span><span·class="p">,</span><span·class="p"·data-group-id="2293729835-7">{</span><span·class="ss">received</span><span·class="p">,</span><span·class="ss">the_message</span><span·class="p"·data-group-id="22937298[·...·truncated·by·diffoscope;·len:·55,·SHA:·f0459c600adcc3d1f0e24e9ae1adaf503a318b0d389b9672182e8cea3d6f5b9f·...·]-6">}</span></code></pre><p>The·implementation·of·a·system·tracer·process·that·produces·this·printout·can317 </span><span·class="p"·data-group-id="9288759724-6">{</span><span·class="ss">ack</span><span·class="p">,</span><span·class="p"·data-group-id="9288759724-7">{</span><span·class="ss">received</span><span·class="p">,</span><span·class="ss">the_message</span><span·class="p"·data-group-id="92887597[·...·truncated·by·diffoscope;·len:·55,·SHA:·937477577b97c3fde61c2be0de46107215285663018186eee166cff0e3006066·...·]-6">}</span></code></pre><p>The·implementation·of·a·system·tracer·process·that·produces·this·printout·can
318 look·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">tracer</span><span·class="p"·data-group-id="8036539858-1">(</span><span·class="p"·data-group-id="8036539858-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">318 look·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">tracer</span><span·class="p"·data-group-id="1883134295-1">(</span><span·class="p"·data-group-id="1883134295-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
319 ····</span><span·class="k">receive</span><span·class="w">319 ····</span><span·class="k">receive</span><span·class="w">
320 ········</span><span·class="p"·data-group-id="8036539858-2">{</span><span·class="ss">seq_trace</span><span·class="p">,</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p"·data-group-id="8036539858-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">320 ········</span><span·class="p"·data-group-id="1883134295-2">{</span><span·class="ss">seq_trace</span><span·class="p">,</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p"·data-group-id="1883134295-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
321 ···········</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-3">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="8036539858-3">)</span><span·class="p">;</span><span·class="w">321 ···········</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-3">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="1883134295-3">)</span><span·class="p">;</span><span·class="w">
322 ········</span><span·class="p"·data-group-id="8036539858-4">{</span><span·class="ss">seq_trace</span><span·class="p">,</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p"·data-group-id="8036539858-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">322 ········</span><span·class="p"·data-group-id="1883134295-4">{</span><span·class="ss">seq_trace</span><span·class="p">,</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p"·data-group-id="1883134295-4">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
323 ···········</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-5">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p"·data-group-id="8036539858-5">)</span><span·class="p">;</span><span·class="w">323 ···········</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-5">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p"·data-group-id="1883134295-5">)</span><span·class="p">;</span><span·class="w">
324 ········</span><span·class="p">_</span><span·class="n">Other</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ignore</span><span·class="w">324 ········</span><span·class="p">_</span><span·class="n">Other</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ignore</span><span·class="w">
325 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">325 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
326 ····</span><span·class="nf">tracer</span><span·class="p"·data-group-id="8036539858-6">(</span><span·class="p"·data-group-id="8036539858-6">)</span><span·class="p">.</span><span·class="w">326 ····</span><span·class="nf">tracer</span><span·class="p"·data-group-id="1883134295-6">(</span><span·class="p"·data-group-id="1883134295-6">)</span><span·class="p">.</span><span·class="w">
  
327 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-7">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="8036539858-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">327 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-7">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="1883134295-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
328 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8036539858-8">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">:&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8036539858-9">[</span><span·class="n">Label</span><span·class="p"·data-group-id="8036539858-9"[·...·truncated·by·diffoscope;·len:·50,·SHA:·c41a8a62bc52f35374ac69c75ba66c2c249695ae4d08866bb76ef17c74a9ea60·...·]-8">)</span><span·class="p">,</span><span·class="w">328 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1883134295-8">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">:&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1883134295-9">[</span><span·class="n">Label</span><span·class="p"·data-group-id="1883134295-9"[·...·truncated·by·diffoscope;·len:·50,·SHA:·36250d41b95051b71eb56673ec5607b964bc6db762a4c96b9e3f1f8854a5d419·...·]-8">)</span><span·class="p">,</span><span·class="w">
329 ····</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-10">(</span><span·class="n">TraceInfo</span><span·class="p"·data-group-id="8036539858-10">)</span><span·class="p">;</span><span·class="w">329 ····</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-10">(</span><span·class="n">TraceInfo</span><span·class="p"·data-group-id="1883134295-10">)</span><span·class="p">;</span><span·class="w">
330 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-11">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p"·data-group-id="8036539858-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">330 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-11">(</span><span·class="n">Label</span><span·class="p">,</span><span·class="n">TraceInfo</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p"·data-group-id="1883134295-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
331 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8036539858-12">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·</span><span·class="si">~p</span><span·class="s">:&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8036539858-13">[</span><span·class="n">Labe[·...·truncated·by·diffoscope;·len:·152,·SHA:·2c466d83c8457965c433eebf8276d5e5154f918bd631f5839d32cdbe2d394679·...·]-12">)</span><span·class="p">,</span><span·class="w">331 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1883134295-12">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·</span><span·class="si">~p</span><span·class="s">:&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1883134295-13">[</span><span·class="n">Labe[·...·truncated·by·diffoscope;·len:·152,·SHA:·3489e2a0dea3b1cba25901a942d7dc7040b821d46c2ae3ab5aa55aa90a043b6d·...·]-12">)</span><span·class="p">,</span><span·class="w">
332 ····</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-14">(</span><span·class="n">TraceInfo</span><span·class="p"·data-group-id="8036539858-14">)</span><span·class="p">.</span><span·class="w">332 ····</span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-14">(</span><span·class="n">TraceInfo</span><span·class="p"·data-group-id="1883134295-14">)</span><span·class="p">.</span><span·class="w">
  
333 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-15">(</span><span·class="p"·data-group-id="8036539858-16">{</span><span·class="ss">print</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·class="p">_</spa[·...·truncated·by·diffoscope;·len:·148,·SHA:·9d5011953faa6f321652bd0473be3d5a00dc26bb7629bfa1b77347e1083bc013·...·]-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">333 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-15">(</span><span·class="p"·data-group-id="1883134295-16">{</span><span·class="ss">print</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·class="p">_</spa[·...·truncated·by·diffoscope;·len:·148,·SHA:·899cac5efeb71f9e7c91f274e031cc2c089bfc6346c902618e77030c90cecdf8·...·]-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
334 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8036539858-17">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·Info·</span><span·class="si">~p</span><span·class="s">·WITH</span><span·class="si">~n</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·340,·SHA:·a0b4678100b1536dfd5fd4c9f2ad2685abf1a033a276bb0bd1e618d90cc705b3·...·]-17">)</span><span·class="p">;</span><span·class="w">334 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1883134295-17">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·Info·</span><span·class="si">~p</span><span·class="s">·WITH</span><span·class="si">~n</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·340,·SHA:·6daa41cd95d2dc11f23005fb22c96f331725a00784114a3277c521f8f170d95a·...·]-17">)</span><span·class="p">;</span><span·class="w">
335 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-19">(</span><span·class="p"·data-group-id="8036539858-20">{</span><span·class="ss">&#39;receive&#39;</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·164,·SHA:·e6c272ede9087e4fad09394749999ab42d0151e5d89d498235541853d1ac6027·...·]-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">335 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-19">(</span><span·class="p"·data-group-id="1883134295-20">{</span><span·class="ss">&#39;receive&#39;</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·164,·SHA:·5348fd117c7d5545cae688b67363878313b836c950b61c08eb857f11dcca7a4f·...·]-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
336 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8036539858-21">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·Received·</span><span·class="si">~p</span><span·class="s">·FROM·</span><span·class="si">~p</span><span·class="s">·WITH</span><span·class="si">~n</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">336 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1883134295-21">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·Received·</span><span·class="si">~p</span><span·class="s">·FROM·</span><span·class="si">~p</span><span·class="s">·WITH</span><span·class="si">~n</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
337 ··············</span><span·class="p"·data-group-id="8036539858-22">[</span><span·class="n">To</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="8036539858-22">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·e81110f405bf91ce8d2e4627401be19ebcf6c32f0bf73936113d6bedb5409339·...·]-21">)</span><span·class="p">;</span><span·class="w">337 ··············</span><span·class="p"·data-group-id="1883134295-22">[</span><span·class="n">To</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="1883134295-22">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·d90671244a29ed65da5f27612514115f7d408eb3d758f17c192f04a33e270143·...·]-21">)</span><span·class="p">;</span><span·class="w">
338 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="8036539858-23">(</span><span·class="p"·data-group-id="8036539858-24">{</span><span·class="nb">send</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·class="n">To</spa[·...·truncated·by·diffoscope;·len:·151,·SHA:·4de45e40b39d08401549d2d239fb6b34e9c015a87dc54d37bf644e942bb7bab6·...·]-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">338 </span><span·class="nf">print_trace</span><span·class="p"·data-group-id="1883134295-23">(</span><span·class="p"·data-group-id="1883134295-24">{</span><span·class="nb">send</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">From</span><span·class="p">,</span><span·class="n">To</spa[·...·truncated·by·diffoscope;·len:·151,·SHA:·513d917c93f0f8807b4712ee1f6444aca600460211b7fdb65ad579d8ae02405f·...·]-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
339 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8036539858-25">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·Sent·</span><span·class="si">~p</span><span·class="s">·TO·</span><span·class="si">~p</span><span·class="s">·WITH</span><span·class="si">~n</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">339 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1883134295-25">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">·Sent·</span><span·class="si">~p</span><span·class="s">·TO·</span><span·class="si">~p</span><span·class="s">·WITH</span><span·class="si">~n</span><span·class="si">~p</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">
340 ··············</span><span·class="p"·data-group-id="8036539858-26">[</span><span·class="n">From</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">To</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="8036539858-26">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·e81110f405bf91ce8d2e4627401be19ebcf6c32f0bf73936113d6bedb5409339·...·]-25">)</span><span·class="p">.</span></code></pre><p>The·code·that·creates·a·process·that·runs·this·tracer·function·and·sets·that340 ··············</span><span·class="p"·data-group-id="1883134295-26">[</span><span·class="n">From</span><span·class="p">,</span><span·class="n">Serial</span><span·class="p">,</span><span·class="n">To</span><span·class="p">,</span><span·class="n">Message</span><span·class="p"·data-group-id="1883134295-26">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·d90671244a29ed65da5f27612514115f7d408eb3d758f17c192f04a33e270143·...·]-25">)</span><span·class="p">.</span></code></pre><p>The·code·that·creates·a·process·that·runs·this·tracer·function·and·sets·that
341 process·as·the·system·tracer·can·look·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start</span><span·class="p"·data-group-id="4377636952-1">(</span><span·class="p"·data-group-id="4377636952-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">341 process·as·the·system·tracer·can·look·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">start</span><span·class="p"·data-group-id="1869701435-1">(</span><span·class="p"·data-group-id="1869701435-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
342 ····</span><span·class="n">Pid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4377636952-2">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="ss">tracer</span><span·class="p">,</span><span·class="p"·data-group-id="4377636952-3">[</span><span·class="p"·data-group-id="4377636952-3">]</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·696fd2feb7e860df7fb4b76d178d9aefa8ec29f84723228338a0adecea216b9a·...·]-2">)</span><span·class="p">,</span><span·class="w">342 ····</span><span·class="n">Pid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1869701435-2">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="ss">tracer</span><span·class="p">,</span><span·class="p"·data-group-id="1869701435-3">[</span><span·class="p"·data-group-id="1869701435-3">]</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·d3fc5b59b052dcb3b5cb294232868922974560e88e00edb6bb0b2a76254f8b1b·...·]-2">)</span><span·class="p">,</span><span·class="w">
343 ····</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_system_tracer</span><span·class="p"·data-group-id="4377636952-4">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="4377636952-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·set·Pid·as·the·system·tracer</span><span·class="w">343 ····</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_system_tracer</span><span·class="p"·data-group-id="1869701435-4">(</span><span·class="n">Pid</span><span·class="p"·data-group-id="1869701435-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·set·Pid·as·the·system·tracer</span><span·class="w">
344 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>With·a·function·like·<code·class="inline">test/0</code>,·the·whole·example·can·be·started:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">test</span><span·class="p"·data-group-id="1467948243-1">(</span><span·class="p"·data-group-id="1467948243-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">344 ····</span><span·class="ss">ok</span><span·class="p">.</span></code></pre><p>With·a·function·like·<code·class="inline">test/0</code>,·the·whole·example·can·be·started:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">test</span><span·class="p"·data-group-id="7417199462-1">(</span><span·class="p"·data-group-id="7417199462-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
345 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1467948243-2">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loop</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1467948243-3">[</span><spa[·...·truncated·by·diffoscope;·len:·118,·SHA:·84a7759cbf1c6d15f393a9bcd50d3d427faf2425d07d6a47a3131617846eb087·...·]-2">)</span><span·class="p">,</span><span·class="w">345 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7417199462-2">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loop</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7417199462-3">[</span><spa[·...·truncated·by·diffoscope;·len:·118,·SHA:·d8ebd713590fb92fd1f85efded45c6dfade081c47d78dd38388fed8a22843b49·...·]-2">)</span><span·class="p">,</span><span·class="w">
346 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="1467948243-4">(</span><span·class="ss">call_server</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1467948243-5">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">[·...·truncated·by·diffoscope;·len:·308,·SHA:·45e20e74e0e3a4b76e7d601136e6dc368459a408e441bcbc73c7b65c57fd9f58·...·]-4">)</span><span·class="p">,</span><span·class="w">346 ····</span><span·class="nf">register</span><span·class="p"·data-group-id="7417199462-4">(</span><span·class="ss">call_server</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7417199462-5">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">[·...·truncated·by·diffoscope;·len:·308,·SHA:·581334bf56eb6f147a54536cd933f6861a33a70ba562d23fda2d9906abe81fbf·...·]-4">)</span><span·class="p">,</span><span·class="w">
347 ····</span><span·class="nf">start</span><span·class="p"·data-group-id="1467948243-7">(</span><span·class="p"·data-group-id="1467948243-7">)</span><span·class="p">,</span><span·class="w">347 ····</span><span·class="nf">start</span><span·class="p"·data-group-id="7417199462-7">(</span><span·class="p"·data-group-id="7417199462-7">)</span><span·class="p">,</span><span·class="w">
348 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="1467948243-8">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="ss">message</span><span·class="p"·data-group-id="1467948243-8">}</span><span·class="p">.</span></code></pre>348 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7417199462-8">{</span><span·class="ss">port</span><span·class="p">,</span><span·class="ss">message</span><span·class="p"·data-group-id="7417199462-8">}</span><span·class="p">.</span></code></pre>
349 ····</section>349 ····</section>
  
350 </div>350 </div>
  
351 ··<section·id="summary"·class="details-list">351 ··<section·id="summary"·class="details-list">
352 ····<h1·class="section-heading">352 ····<h1·class="section-heading">
353 ······<a·class="hover-link"·href="#summary">353 ······<a·class="hover-link"·href="#summary">
Offset 907, 19 lines modifiedOffset 907, 19 lines modified
  
907 ······</div>907 ······</div>
  
908 <p>Sets·the·trace·token·for·the·calling·process·to·<code·class="inline">Token</code>.·If·<code·class="inline">Token·==·[]</code>·then908 <p>Sets·the·trace·token·for·the·calling·process·to·<code·class="inline">Token</code>.·If·<code·class="inline">Token·==·[]</code>·then
909 tracing·is·disabled,·otherwise·<code·class="inline">Token</code>·should·be·an·Erlang·term·returned·from909 tracing·is·disabled,·otherwise·<code·class="inline">Token</code>·should·be·an·Erlang·term·returned·from
910 <a·href="#get_token/0"><code·class="inline">get_token/0</code></a>·or·<a·href="#set_token/1"><code·class="inline">set_token/1</code></a>.·<a·href="#set_token/1"><code·class="inline">set_token/1</code></a>910 <a·href="#get_token/0"><code·class="inline">get_token/0</code></a>·or·<a·href="#set_token/1"><code·class="inline">set_token/1</code></a>.·<a·href="#set_token/1"><code·class="inline">set_token/1</code></a>
911 can·be·used·to·temporarily·exclude·message·passing·from·the·trace·by·setting·the911 can·be·used·to·temporarily·exclude·message·passing·from·the·trace·by·setting·the
912 trace·token·to·empty·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">OldToken</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="9605488263-1">(</span><span·class="p"·data-group-id="9605488263-2">[</span><span·class="p"·data-group-id="9605488263-2">]</span><span·class="p"·data-group-id="9605488263-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·set·to·empty·and·save</span><span·class="w">912 trace·token·to·empty·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">OldToken</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="0012738360-1">(</span><span·class="p"·data-group-id="0012738360-2">[</span><span·class="p"·data-group-id="0012738360-2">]</span><span·class="p"·data-group-id="0012738360-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·set·to·empty·and·save</span><span·class="w">
913 ····································</span><span·class="c1">%·old·value</span><span·class="w">913 ····································</span><span·class="c1">%·old·value</span><span·class="w">
914 </span><span·class="c1">%·do·something·that·should·not·be·part·of·the·trace</span><span·class="w">914 </span><span·class="c1">%·do·something·that·should·not·be·part·of·the·trace</span><span·class="w">
915 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9605488263-3">(</span><span·class="s">&quot;Exclude·the·signalling·caused·by·this</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p"·data-group-id="9605488263-3">)</span><span·class="p">,</span><span·class="w">915 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0012738360-3">(</span><span·class="s">&quot;Exclude·the·signalling·caused·by·this</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p"·data-group-id="0012738360-3">)</span><span·class="p">,</span><span·class="w">
916 </span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="9605488263-4">(</span><span·class="n">OldToken</span><span·class="p"·data-group-id="9605488263-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·activate·the·trace·token·again</span><span·class="w">916 </span><span·class="nc">seq_trace</span><span·class="p">:</span><span·class="nf">set_token</span><span·class="p"·data-group-id="0012738360-4">(</span><span·class="n">OldToken</span><span·class="p"·data-group-id="0012738360-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·activate·the·trace·token·again</span><span·class="w">
917 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Returns·the·previous·value·of·the·trace·token.</p>917 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>Returns·the·previous·value·of·the·trace·token.</p>
918 ··</section>918 ··</section>
919 </section>919 </section>
920 <section·class="detail"·id="set_token/2">920 <section·class="detail"·id="set_token/2">
  
921 ··<div·class="detail-header">921 ··<div·class="detail-header">
922 ····<a·href="#set_token/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">922 ····<a·href="#set_token/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1001, 15 lines modifiedOffset 1001, 15 lines modified
1001 ······<p·class="built-using">1001 ······<p·class="built-using">
1002 ········Built·using1002 ········Built·using
1003 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1003 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1004 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1004 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1005 ······</p>1005 ······</p>
1006 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1006 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1007 ····</footer>1007 ····</footer>
1008 ··</div>1008 ··</div>
1009 </main>1009 </main>
1010 </div>1010 </div>
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168 and·using·that·as·the·<code·class="inline">Timeout | Handle</code>·argument,·the·same·<code·class="inline">Handle</code>168 and·using·that·as·the·<code·class="inline">Timeout | Handle</code>·argument,·the·same·<code·class="inline">Handle</code>
169 will·then·be·the·<a·href="#t:select_handle/0"><code·class="inline">SelectHandle</code></a>·in·the·returned169 will·then·be·the·<a·href="#t:select_handle/0"><code·class="inline">SelectHandle</code></a>·in·the·returned
170 <a·href="#t:select_info/0"><code·class="inline">select_info/0</code></a>·and·the·received·<code·class="inline">select</code>·message,·or·be170 <a·href="#t:select_info/0"><code·class="inline">select_info/0</code></a>·and·the·received·<code·class="inline">select</code>·message,·or·be
171 the·<a·href="#t:completion_handle/0"><code·class="inline">CompletionHandle</code></a>·in·the·returned171 the·<a·href="#t:completion_handle/0"><code·class="inline">CompletionHandle</code></a>·in·the·returned
172 <a·href="#t:completion_info/0"><code·class="inline">completion_info/0</code></a>·and·the·received·<code·class="inline">completion</code>·message.</p><p>The·compiler·may·then·optimize·a·following·<code·class="inline">receive</code>·statement172 <a·href="#t:completion_info/0"><code·class="inline">completion_info/0</code></a>·and·the·received·<code·class="inline">completion</code>·message.</p><p>The·compiler·may·then·optimize·a·following·<code·class="inline">receive</code>·statement
173 to·only·scan·the·messages·that·arrive·after·the·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0"><code·class="inline">reference/0</code></a>173 to·only·scan·the·messages·that·arrive·after·the·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0"><code·class="inline">reference/0</code></a>
174 is·created.··If·the·message·queue·is·large·this·is·a·big·optimization.</p><p>The·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0"><code·class="inline">reference/0</code></a>·has·to·be·unique·for·the·call.</p><h4>Repeating·an·Operation·on·a·<code·class="inline">select</code>·Systems</h4><p>On<code·class="inline">select</code>·systems,·if·a·call·would·be·repeated·<em>before</em>·the·<code·class="inline">select</code>174 is·created.··If·the·message·queue·is·large·this·is·a·big·optimization.</p><p>The·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0"><code·class="inline">reference/0</code></a>·has·to·be·unique·for·the·call.</p><h4>Repeating·an·Operation·on·a·<code·class="inline">select</code>·Systems</h4><p>On<code·class="inline">select</code>·systems,·if·a·call·would·be·repeated·<em>before</em>·the·<code·class="inline">select</code>
175 message·has·been·received·it·replaces·the·call·in·progress:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p"·data-group-id="3990606749-1">{</span><span·class="ss">select</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3990606749-2">{</span><span·class="ss">select_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Hand[·...·truncated·by·diffoscope;·len:·471,·SHA:·b4c97a16c4dee89c1879b8c7d508d380f42fc3cc99f38dd969050ca36053bb12·...·]-3">)</span><span·class="p">,</span><span·class="w">175 message·has·been·received·it·replaces·the·call·in·progress:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p"·data-group-id="8875831508-1">{</span><span·class="ss">select</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8875831508-2">{</span><span·class="ss">select_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Hand[·...·truncated·by·diffoscope;·len:·471,·SHA:·9ee4c9bec7046805cd52a8e2c5f493fd282a4ad16a6c4ebdcc3a37316061d2a8·...·]-3">)</span><span·class="p">,</span><span·class="w">
176 ····</span><span·class="p"·data-group-id="3990606749-4">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="p"·data-group-id="3990606749-4">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·280,·SHA:·88ffed13d3bf5fe3eb3d3b0f852e4246f7698a93655f2bc8b61e702e7be590d7·...·]-5">)</span><span·class="p">,</span><span·class="w">176 ····</span><span·class="p"·data-group-id="8875831508-4">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="p"·data-group-id="8875831508-4">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·280,·SHA:·8bb397551a1e45d47287876c1937acb7e83ce671cf59d8f36819d256673b7c22·...·]-5">)</span><span·class="p">,</span><span·class="w">
177 ····</span><span·class="p">:</span></code></pre><p>Above,·<code·class="inline">Handle</code>·is·<em>no·longer</em>·valid·once·the·second·<a·href="#accept/2"><code·class="inline">accept/2</code></a>,·call177 ····</span><span·class="p">:</span></code></pre><p>Above,·<code·class="inline">Handle</code>·is·<em>no·longer</em>·valid·once·the·second·<a·href="#accept/2"><code·class="inline">accept/2</code></a>,·call
178 has·been·made·(the·first·call·is·automatically·canceled).178 has·been·made·(the·first·call·is·automatically·canceled).
179 After·the·second·<a·href="#accept/2"><code·class="inline">accept/2</code></a>·call·returns·<code·class="inline">{error,·timeout}</code>,179 After·the·second·<a·href="#accept/2"><code·class="inline">accept/2</code></a>·call·returns·<code·class="inline">{error,·timeout}</code>,
180 the·accept·operation·has·completed.</p><p>Note·that·there·is·a·race·here;·there·is·no·way·to·know·if·the·call180 the·accept·operation·has·completed.</p><p>Note·that·there·is·a·race·here;·there·is·no·way·to·know·if·the·call
181 is·repeated·<em>before</em>·the·<code·class="inline">select</code>·message·is·sent·since·it·<em>may</em>181 is·repeated·<em>before</em>·the·<code·class="inline">select</code>·message·is·sent·since·it·<em>may</em>
182 have·been·sent·just·before·the·repeated·call.··So·now·there182 have·been·sent·just·before·the·repeated·call.··So·now·there
183 might·be·a·<code·class="inline">select</code>·message·containing·<code·class="inline">Handle</code>·in·the·inbox.</p><h4>The·<code·class="inline">abort</code>·Message</h4><p>Another·message·the·user·must·be·prepared·for183 might·be·a·<code·class="inline">select</code>·message·containing·<code·class="inline">Handle</code>·in·the·inbox.</p><h4>The·<code·class="inline">abort</code>·Message</h4><p>Another·message·the·user·must·be·prepared·for
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202 (<a·href="#t:completion_handle/0">completion·handle</a>)202 (<a·href="#t:completion_handle/0">completion·handle</a>)
203 API·features·could·be·considered·no·longer·experimental.</li></ul><h2·id="module-examples"·class="section-heading">203 API·features·could·be·considered·no·longer·experimental.</li></ul><h2·id="module-examples"·class="section-heading">
204 ··<a·href="#module-examples"·class="hover-link">204 ··<a·href="#module-examples"·class="hover-link">
205 ····<i·class="ri-link-m"·aria-hidden="true"></i>205 ····<i·class="ri-link-m"·aria-hidden="true"></i>
206 ··</a>206 ··</a>
207 ··<span·class="text">Examples</span>207 ··<span·class="text">Examples</span>
208 </h2>208 </h2>
209 <pre><code·class="makeup·erlang"·translate="no"><span·class="nf">client</span><span·class="p"·data-group-id="7430301061-1">(</span><span·class="n">SAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SPort</span><span·class="p"·data-group-id="7430301061-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">209 <pre><code·class="makeup·erlang"·translate="no"><span·class="nf">client</span><span·class="p"·data-group-id="1916912564-1">(</span><span·class="n">SAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SPort</span><span·class="p"·data-group-id="1916912564-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
210 ···</span><span·class="p"·data-group-id="7430301061-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="7430301061-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·349,·SHA:·868d231681ba7e5842c0360b344b0ac09971d2710df3fad95868a8614921f282·...·]-3">)</span><span·class="p">,</span><span·class="w">210 ···</span><span·class="p"·data-group-id="1916912564-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="1916912564-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·349,·SHA:·1e1b4bc3c1c7debf7ad1ff01df5d6cf9d0637a1c937108ae18cbf79155f6785a·...·]-3">)</span><span·class="p">,</span><span·class="w">
211 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="7430301061-4">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7430301061-5">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">211 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="1916912564-4">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1916912564-5">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">
212 ·······························</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">SAddr</span><span·class="p">,</span><span·class="w">212 ·······························</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">SAddr</span><span·class="p">,</span><span·class="w">
213 ·······························</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">SPort</span><span·class="p"·data-group-id="7430301061-5">}</span><span·class="p"·data-group-id="7430301061-4">)</span><span·class="p">,</span><span·class="w">213 ·······························</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">SPort</span><span·class="p"·data-group-id="1916912564-5">}</span><span·class="p"·data-group-id="1916912564-4">)</span><span·class="p">,</span><span·class="w">
214 ···</span><span·class="n">Msg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7430301061-6">&lt;&lt;</span><span·class="s">&quot;hello&quot;</span><span·class="p"·data-group-id="7430301061-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">214 ···</span><span·class="n">Msg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1916912564-6">&lt;&lt;</span><span·class="s">&quot;hello&quot;</span><span·class="p"·data-group-id="1916912564-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">
215 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="7430301061-7">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7430301061-7">)</span><span·class="p">,</span><span·class="w">215 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="1916912564-7">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1916912564-7">)</span><span·class="p">,</span><span·class="w">
216 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="7430301061-8">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">write</span><span·class="p"·data-group-id="7430301061-8">)</span><span·class="p">,</span><span·class="w">216 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="1916912564-8">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">write</span><span·class="p"·data-group-id="1916912564-8">)</span><span·class="p">,</span><span·class="w">
217 ···</span><span·class="p"·data-group-id="7430301061-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7430301061-9">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·195,·SHA:·458d25ad26124cc491f1f6e28fa80f1da1f233f85646afb8da82cbdbedcc911a·...·]-10">)</span><span·class="p">,</span><span·class="w">217 ···</span><span·class="p"·data-group-id="1916912564-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1916912564-9">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·195,·SHA:·b197d693efbd22000442c9acf3cc481b7621e48e13aa61789faf43bdc35898c7·...·]-10">)</span><span·class="p">,</span><span·class="w">
218 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="7430301061-11">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7430301061-11">)</span><span·class="p">.</span><span·class="w">218 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1916912564-11">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="1916912564-11">)</span><span·class="p">.</span><span·class="w">
  
219 </span><span·class="nf">server</span><span·class="p"·data-group-id="7430301061-12">(</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="7430301061-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 </span><span·class="nf">server</span><span·class="p"·data-group-id="1916912564-12">(</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="1916912564-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ···</span><span·class="p"·data-group-id="7430301061-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LSock</span><span·class="p"·data-group-id="7430301061-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·353,·SHA:·0fbe9dcd9fe2237649a69b632f319c3b38fba0df9866f6751d3fac14bbb273f3·...·]-14">)</span><span·class="p">,</span><span·class="w">220 ···</span><span·class="p"·data-group-id="1916912564-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LSock</span><span·class="p"·data-group-id="1916912564-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·353,·SHA:·020c4fc98aa5532171be14c3df37ddd549fa36d228fdb5ecb014b097cfcd9c76·...·]-14">)</span><span·class="p">,</span><span·class="w">
221 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">bind</span><span·class="p"·data-group-id="7430301061-15">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7430301061-16">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">221 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">bind</span><span·class="p"·data-group-id="1916912564-15">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1916912564-16">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">
222 ·····························</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">222 ·····························</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">
223 ·····························</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p"·data-group-id="7430301061-16">}</span><span·class="p"·data-group-id="7430301061-15">)</span><span·class="p">,</span><span·class="w">223 ·····························</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p"·data-group-id="1916912564-16">}</span><span·class="p"·data-group-id="1916912564-15">)</span><span·class="p">,</span><span·class="w">
224 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">listen</span><span·class="p"·data-group-id="7430301061-17">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="7430301061-17">)</span><span·class="p">,</span><span·class="w">224 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">listen</span><span·class="p"·data-group-id="1916912564-17">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="1916912564-17">)</span><span·class="p">,</span><span·class="w">
225 ···</span><span·class="p"·data-group-id="7430301061-18">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="7430301061-18">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·201,·SHA:·a7f9b988135f0bf8669c9e31c903d893da532381225b51d0e966366ab1eb1148·...·]-19">)</span><span·class="p">,</span><span·class="w">225 ···</span><span·class="p"·data-group-id="1916912564-18">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="1916912564-18">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·201,·SHA:·49a5ce6f6be5c25855b9aacdc2d05c96e20e81116c4614b6790cc9fee418f197·...·]-19">)</span><span·class="p">,</span><span·class="w">
226 ···</span><span·class="p"·data-group-id="7430301061-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7430301061-20">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·197,·SHA:·26eb05233a779684584844860d2e1f0c471b6dff88c3d47df35e7cc24c24e769·...·]-21">)</span><span·class="p">,</span><span·class="w">226 ···</span><span·class="p"·data-group-id="1916912564-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1916912564-20">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·197,·SHA:·8d0ea9ba11df59af90f0e0dc9415a2c28e34d4bb6dd20c8db8c61bcba1590f75·...·]-21">)</span><span·class="p">,</span><span·class="w">
227 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="7430301061-22">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7430301061-22">)</span><span·class="p">,</span><span·class="w">227 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="1916912564-22">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="1916912564-22">)</span><span·class="p">,</span><span·class="w">
228 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="7430301061-23">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7430301061-23">)</span><span·class="p">,</span><span·class="w">228 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1916912564-23">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="1916912564-23">)</span><span·class="p">,</span><span·class="w">
229 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="7430301061-24">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="7430301061-24">)</span><span·class="p">.</span></code></pre>229 ···</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1916912564-24">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="1916912564-24">)</span><span·class="p">.</span></code></pre>
230 ····</section>230 ····</section>
  
231 </div>231 </div>
  
232 ··<section·id="summary"·class="details-list">232 ··<section·id="summary"·class="details-list">
233 ····<h1·class="section-heading">233 ····<h1·class="section-heading">
234 ······<a·class="hover-link"·href="#summary">234 ······<a·class="hover-link"·href="#summary">
Offset 4669, 15 lines modifiedOffset 4669, 15 lines modified
4669 with·its·name·and·address.</p></li><li><p><strong><code·class="inline">nread</code></strong>·-·Get·the·number·of·bytes·immediately·available·for·reading4669 with·its·name·and·address.</p></li><li><p><strong><code·class="inline">nread</code></strong>·-·Get·the·number·of·bytes·immediately·available·for·reading
4670 <em>(since·OTP·26.1)</em>.</p><p>Result;·the·number·of·bytes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p></li><li><p><strong><code·class="inline">nwrite</code></strong>·-·Get·the·number·of·bytes·in·the·send·queue4670 <em>(since·OTP·26.1)</em>.</p><p>Result;·the·number·of·bytes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p></li><li><p><strong><code·class="inline">nwrite</code></strong>·-·Get·the·number·of·bytes·in·the·send·queue
4671 <em>(since·OTP·26.1)</em>.</p><p>Result;·the·number·of·bytes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p></li><li><p><strong><code·class="inline">nspace</code></strong>·-·Get·the·free·space·in·the·send·queue4671 <em>(since·OTP·26.1)</em>.</p><p>Result;·the·number·of·bytes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p></li><li><p><strong><code·class="inline">nspace</code></strong>·-·Get·the·free·space·in·the·send·queue
4672 <em>(since·OTP·26.1)</em>.</p><p>Result;·the·number·of·bytes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p></li><li><p><strong><code·class="inline">atmark</code></strong>·-·Test·if·there·is·OOB·(out-of-bound)·data·waiting·to·be·read4672 <em>(since·OTP·26.1)</em>.</p><p>Result;·the·number·of·bytes,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p></li><li><p><strong><code·class="inline">atmark</code></strong>·-·Test·if·there·is·OOB·(out-of-bound)·data·waiting·to·be·read
4673 <em>(since·OTP·26.1)</em>.</p><p>Result;·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0"><code·class="inline">boolean/0</code></a>.</p></li><li><p><strong><code·class="inline">tcp_info</code></strong>·-·Get·miscellaneous·TCP·related·information·for·a4673 <em>(since·OTP·26.1)</em>.</p><p>Result;·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0"><code·class="inline">boolean/0</code></a>.</p></li><li><p><strong><code·class="inline">tcp_info</code></strong>·-·Get·miscellaneous·TCP·related·information·for·a
4674 <em>connected</em>·socket·<em>(since·OTP·26.1)</em>.</p><p>Result;·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:map/0"><code·class="inline">map/0</code></a>·with·information·items·as·key-value·pairs.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Not·all·requests·are·supported·by·all·platforms.4674 <em>connected</em>·socket·<em>(since·OTP·26.1)</em>.</p><p>Result;·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:map/0"><code·class="inline">map/0</code></a>·with·information·items·as·key-value·pairs.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Not·all·requests·are·supported·by·all·platforms.
4675 To·see·if·a·ioctl·request·is·supported·on·the·current·platform:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="n">Request</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">nread</span><span·class="p">,</span><span·class="w">4675 To·see·if·a·ioctl·request·is·supported·on·the·current·platform:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="n">Request</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">nread</span><span·class="p">,</span><span·class="w">
4676 ······</span><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">is_supported</span><span·class="p"·data-group-id="0692724924-1">(</span><span·class="ss">ioctl_requests</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p"·data-group-id="0692724924-1">)</span><span·class="p">,</span><span·class="w">4676 ······</span><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">is_supported</span><span·class="p"·data-group-id="0286031577-1">(</span><span·class="ss">ioctl_requests</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Request</span><span·class="p"·data-group-id="0286031577-1">)</span><span·class="p">,</span><span·class="w">
4677 ······</span><span·class="p">:</span></code></pre></section>4677 ······</span><span·class="p">:</span></code></pre></section>
4678 ··</section>4678 ··</section>
4679 </section>4679 </section>
4680 <section·class="detail"·id="ioctl/3">4680 <section·class="detail"·id="ioctl/3">
  
4681 ··<div·class="detail-header">4681 ··<div·class="detail-header">
4682 ····<a·href="#ioctl/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">4682 ····<a·href="#ioctl/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 4827, 15 lines modifiedOffset 4827, 15 lines modified
  
4827 ··········<pre·translate="no"><span·class="attribute">-spec</span>·is_supported(Key1·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>().</pre>4827 ··········<pre·translate="no"><span·class="attribute">-spec</span>·is_supported(Key1·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>().</pre>
  
4828 ······</div>4828 ······</div>
  
4829 <p>Check·if·a·socket·feature·is·supported.</p><p>Returns·<code·class="inline">true</code>·if·<a·href="#supports/0"><code·class="inline">supports/0</code></a>·has·a·<code·class="inline">{Key1,·true}</code>·tuple4829 <p>Check·if·a·socket·feature·is·supported.</p><p>Returns·<code·class="inline">true</code>·if·<a·href="#supports/0"><code·class="inline">supports/0</code></a>·has·a·<code·class="inline">{Key1,·true}</code>·tuple
4830 or·a·<code·class="inline">{Key1,·list()}</code>·tuple·in·its·returned·list,4830 or·a·<code·class="inline">{Key1,·list()}</code>·tuple·in·its·returned·list,
4831 otherwise·<code·class="inline">false</code>·(also·for·unknown·keys).</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">is_supported</span><span·class="p"·data-group-id="6563036894-1">(</span><span·class="ss">local</span><span·class="p"·data-group-id="6563036894-1">)</span><span·class="p">,</span></code></pre>4831 otherwise·<code·class="inline">false</code>·(also·for·unknown·keys).</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">is_supported</span><span·class="p"·data-group-id="9631278721-1">(</span><span·class="ss">local</span><span·class="p"·data-group-id="9631278721-1">)</span><span·class="p">,</span></code></pre>
4832 ··</section>4832 ··</section>
4833 </section>4833 </section>
4834 <section·class="detail"·id="is_supported/2">4834 <section·class="detail"·id="is_supported/2">
  
4835 ··<div·class="detail-header">4835 ··<div·class="detail-header">
4836 ····<a·href="#is_supported/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">4836 ····<a·href="#is_supported/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
4837 ······<i·class="ri-link-m"·aria-hidden="true"></i>4837 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 4856, 15 lines modifiedOffset 4856, 15 lines modified
4856 ······<div·class="specs">4856 ······<div·class="specs">
  
4857 ··········<pre·translate="no"><span·class="attribute">-spec</span>·is_supported(Key1·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·Key2·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>().</pre>4857 ··········<pre·translate="no"><span·class="attribute">-spec</span>·is_supported(Key1·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·Key2·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>().</pre>
  
4858 ······</div>4858 ······</div>
  
4859 <p>Check·if·a·socket·feature·is·supported.</p><p>Returns·<code·class="inline">true</code>·if·<a·href="#supports/1"><code·class="inline">supports(Key1)</code></a>·has·a·<code·class="inline">{Key2,·true}</code>·tuple4859 <p>Check·if·a·socket·feature·is·supported.</p><p>Returns·<code·class="inline">true</code>·if·<a·href="#supports/1"><code·class="inline">supports(Key1)</code></a>·has·a·<code·class="inline">{Key2,·true}</code>·tuple
4860 in·its·returned·list,·otherwise·<code·class="inline">false</code>·(also·for·unknown·keys).</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">is_supported</span><span·class="p"·data-group-id="0000802501-1">(</span><span·class="ss">msg_flags</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">errqueue</span><span·class="p"·data-group-id="0000802501-1">)</span><span·class="p">,</span></code></pre>4860 in·its·returned·list,·otherwise·<code·class="inline">false</code>·(also·for·unknown·keys).</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">is_supported</span><span·class="p"·data-group-id="1034575842-1">(</span><span·class="ss">msg_flags</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">errqueue</span><span·class="p"·data-group-id="1034575842-1">)</span><span·class="p">,</span></code></pre>
4861 ··</section>4861 ··</section>
4862 </section>4862 </section>
4863 <section·class="detail"·id="listen/1">4863 <section·class="detail"·id="listen/1">
  
4864 ··<div·class="detail-header">4864 ··<div·class="detail-header">
4865 ····<a·href="#listen/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">4865 ····<a·href="#listen/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
4866 ······<i·class="ri-link-m"·aria-hidden="true"></i>4866 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 4947, 15 lines modifiedOffset 4947, 15 lines modified
  
4947 ··········<pre·translate="no"><span·class="attribute">-spec</span>·monitor(Socket·::·<a·href="#t:socket/0">socket</a>())·->·MonitorRef·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0">reference</a>().</pre>4947 ··········<pre·translate="no"><span·class="attribute">-spec</span>·monitor(Socket·::·<a·href="#t:socket/0">socket</a>())·->·MonitorRef·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:reference/0">reference</a>().</pre>
  
4948 ······</div>4948 ······</div>
  
4949 <p>Start·a·socket·monitor.</p><p>If·the·<code·class="inline">Socket</code>·doesn't·exist·or·when·later·the·monitor·is·triggered,4949 <p>Start·a·socket·monitor.</p><p>If·the·<code·class="inline">Socket</code>·doesn't·exist·or·when·later·the·monitor·is·triggered,
4950 a·<code·class="inline">'DOWN'</code>·message·is·sent·to·the·process·that·called·<a·href="#monitor/1"><code·class="inline">monitor/1</code></a>4950 a·<code·class="inline">'DOWN'</code>·message·is·sent·to·the·process·that·called·<a·href="#monitor/1"><code·class="inline">monitor/1</code></a>
4951 with·the·following·pattern:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»       ····</span><span·class="p"·data-group-id="4302495453-1">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MonitorRef</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">socket</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·156,·SHA:·c180ab85224660aa7ce26f2c1302b7be9c1b8da1746ce26c3170e457846b7252·...·]-1">}</span></code></pre><p><code·class="inline">Info</code>·is·the·termination·reason·of·the·socket·or·<code·class="inline">nosock</code>·if4951 with·the·following·pattern:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»       ····</span><span·class="p"·data-group-id="7659411929-1">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MonitorRef</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">socket</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·156,·SHA:·0c389e353b6cda41b0c21f88b0f5231250089071e526cb3d75b053a2ce07bd2c·...·]-1">}</span></code></pre><p><code·class="inline">Info</code>·is·the·termination·reason·of·the·socket·or·<code·class="inline">nosock</code>·if
4952 <code·class="inline">Socket</code>·did·not·exist·when·the·monitor·was·started.</p><p>Making·several·calls·to·<a·href="#monitor/1"><code·class="inline">socket:monitor/1</code></a>·for·the·same·<code·class="inline">Socket</code>·is·not·an4952 <code·class="inline">Socket</code>·did·not·exist·when·the·monitor·was·started.</p><p>Making·several·calls·to·<a·href="#monitor/1"><code·class="inline">socket:monitor/1</code></a>·for·the·same·<code·class="inline">Socket</code>·is·not·an
4953 error;·each·call·creates·an·independent·monitor·instance.</p>4953 error;·each·call·creates·an·independent·monitor·instance.</p>
4954 ··</section>4954 ··</section>
4955 </section>4955 </section>
4956 <section·class="detail"·id="number_of/0">4956 <section·class="detail"·id="number_of/0">
  
4957 ··<div·class="detail-header">4957 ··<div·class="detail-header">
Offset 5354, 33 lines modifiedOffset 5354, 33 lines modified
5354 if·no·data·has·arrived·after·<code·class="inline">Timeout</code>·milliseconds,5354 if·no·data·has·arrived·after·<code·class="inline">Timeout</code>·milliseconds,
5355 or·<code·class="inline">{error, {timeout, Data}}</code>·if·some·but·not·enough·data5355 or·<code·class="inline">{error, {timeout, Data}}</code>·if·some·but·not·enough·data
5356 has·been·received·on·a·socket·of·<a·href="#t:type/0">type·<code·class="inline">stream</code></a>.5356 has·been·received·on·a·socket·of·<a·href="#t:type/0">type·<code·class="inline">stream</code></a>.
5357 It·<em>can</em>·also·return·directly·with·<code·class="inline">{ok, Data}</code>·(<a·href="#t:type/0">type·<code·class="inline">dgram</code></a>).5357 It·<em>can</em>·also·return·directly·with·<code·class="inline">{ok, Data}</code>·(<a·href="#t:type/0">type·<code·class="inline">dgram</code></a>).
5358 On·Unix,·if·will·return·<code·class="inline">{error,·timeout}</code>·either·if·no·data5358 On·Unix,·if·will·return·<code·class="inline">{error,·timeout}</code>·either·if·no·data
5359 has·arrived·or·if·not·enough·data·(Length·&gt;·0)·has·arrived.5359 has·arrived·or·if·not·enough·data·(Length·&gt;·0)·has·arrived.
5360 It·is·then·up·to·the·caller·to·make·another·all·to·see·if·5360 It·is·then·up·to·the·caller·to·make·another·all·to·see·if·
5361 some·data·has·arrived·(and·was·stored·internally):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="5875431728-1">(</span><span·class="n">Socket</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p"·data-group-id="5875431728-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">5361 some·data·has·arrived·(and·was·stored·internally):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="5791669198-1">(</span><span·class="n">Socket</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p"·data-group-id="5791669198-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
5362 ········</span><span·class="p"·data-group-id="5875431728-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="5875431728-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="c1">%·10·bytes·of·data</span><span·class="w">5362 ········</span><span·class="p"·data-group-id="5791669198-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="5791669198-2">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="c1">%·10·bytes·of·data</span><span·class="w">
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182 effects·<em>that</em>·specific·socket).</p><h2·id="example"·class="section-heading">182 effects·<em>that</em>·specific·socket).</p><h2·id="example"·class="section-heading">
183 ··<a·href="#example"·class="hover-link">183 ··<a·href="#example"·class="hover-link">
184 ····<i·class="ri-link-m"·aria-hidden="true"></i>184 ····<i·class="ri-link-m"·aria-hidden="true"></i>
185 ··</a>185 ··</a>
186 ··<span·class="text">Example</span>186 ··<span·class="text">Example</span>
187 </h2>187 </h2>
188 <p>This·example·is·intended·to·show·how·to·create·a·simple·(echo)·server188 <p>This·example·is·intended·to·show·how·to·create·a·simple·(echo)·server
189 (and·client),·handling·both·'select'·and·'completion'·(Unix·and·Windows).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7847508121-1">(</span><span·class="ss">example</span><span·class="p"·data-group-id="7847508121-1">)</span><span·class="p">.</span><span·class="w">189 (and·client),·handling·both·'select'·and·'completion'·(Unix·and·Windows).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5364100819-1">(</span><span·class="ss">example</span><span·class="p"·data-group-id="5364100819-1">)</span><span·class="p">.</span><span·class="w">
190 </span><span·class="w">190 </span><span·class="w">
191 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7847508121-2">(</span><span·class="p"·data-group-id="7847508121-3">[</span><span·class="ss">client</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">client</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·119,·SHA:·56df8d60a13c72915e3a95c0cd817b0c5f9c4902d6f5cb8140285af452b0b957·...·]-2">)</span><span·class="p">.</span><span·class="w">191 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5364100819-2">(</span><span·class="p"·data-group-id="5364100819-3">[</span><span·class="ss">client</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">client</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·119,·SHA:·22a769006af550828c6d9cf9798476161dcb05a828c86f66a62f0471e9e72bec·...·]-2">)</span><span·class="p">.</span><span·class="w">
192 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7847508121-4">(</span><span·class="p"·data-group-id="7847508121-5">[</span><span·class="ss">server</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">server</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·246,·SHA:·e063e5555f6ae05a2e710a7641860b35068caece88a35cf6ee74f27d55ad9d8d·...·]-4">)</span><span·class="p">.</span><span·class="w">192 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5364100819-4">(</span><span·class="p"·data-group-id="5364100819-5">[</span><span·class="ss">server</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">server</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·246,·SHA:·188563e407da3aa72195f3799ec317a7ddc6fe317b48e588bd9149e8b496263f·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
  
193 </span><span·class="c1">%%·======================================================================</span><span·class="w">193 </span><span·class="c1">%%·======================================================================</span><span·class="w">
  
194 </span><span·class="c1">%%·===·Client·===</span><span·class="w">194 </span><span·class="c1">%%·===·Client·===</span><span·class="w">
  
195 </span><span·class="nf">client</span><span·class="p"·data-group-id="7847508121-6">(</span><span·class="p"·data-group-id="7847508121-7">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Family</span><span·class="p"·data-group-id="7847508121-7">}</[·...·truncated·by·diffoscope;·len:·229,·SHA:·c85f77cf432bee82ba7b04b8745eb73edc3504c085b4b0325860409a12b48c25·...·]-6">)</span><span·class="w">195 </span><span·class="nf">client</span><span·class="p"·data-group-id="5364100819-6">(</span><span·class="p"·data-group-id="5364100819-7">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Family</span><span·class="p"·data-group-id="5364100819-7">}</[·...·truncated·by·diffoscope;·len:·229,·SHA:·1d1bbcaaf4785a1d06881babcee26af71074ec096ed7aa3b221d09369b13bd4c·...·]-6">)</span><span·class="w">
196 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="7847508121-8">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-8">)</span><span·class="w">·</span><span·class="ow">orelse</span><span·class="w">·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="7847508121-9"[·...·truncated·by·diffoscope;·len:·76,·SHA:·22e11c32d8e9750d89d89ea0ffaaea3cf06a094f21ac0cf7339309f4039f8264·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">196 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="5364100819-8">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-8">)</span><span·class="w">·</span><span·class="ow">orelse</span><span·class="w">·</span><span·class="nf">is_binary</span><span·class="p"·data-group-id="5364100819-9"[·...·truncated·by·diffoscope;·len:·76,·SHA:·d26c1df23c66644ae99eae62dcac6eac2391ad75209e0ec308dd740265426c90·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
197 ····</span><span·class="p"·data-group-id="7847508121-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="7847508121-10">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·357,·SHA:·52e028ab34f2ee3961af06635738c4249f7d05eef4953799bed16f879a416b76·...·]-11">)</span><span·class="p">,</span><span·class="w">197 ····</span><span·class="p"·data-group-id="5364100819-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="5364100819-10">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·357,·SHA:·b1bf1f59e38ab09ca90879155238665e4e40f31b6e0422365fb333a148564188·...·]-11">)</span><span·class="p">,</span><span·class="w">
198 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">maybe_bind</span><span·class="p"·data-group-id="7847508121-12">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Family</span><span·class="p"·data-group-id="7847508121-12">)</span><span·class="p">,</span><span·class="w">198 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">maybe_bind</span><span·class="p"·data-group-id="5364100819-12">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Family</span><span·class="p"·data-group-id="5364100819-12">)</span><span·class="p">,</span><span·class="w">
199 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="7847508121-13">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ServerSockAddr</span><span·class="p"·data-group-id="7847508121-13">)</span><span·class="p">,</span><span·class="w">199 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="5364100819-13">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ServerSockAddr</span><span·class="p"·data-group-id="5364100819-13">)</span><span·class="p">,</span><span·class="w">
200 ····</span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="7847508121-14">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-14">)</span><span·class="p">;</span><span·class="w">200 ····</span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="5364100819-14">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-14">)</span><span·class="p">;</span><span·class="w">
  
201 </span><span·class="nf">client</span><span·class="p"·data-group-id="7847508121-15">(</span><span·class="n">ServerPort</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-15">)</span><span·class="w">201 </span><span·class="nf">client</span><span·class="p"·data-group-id="5364100819-15">(</span><span·class="n">ServerPort</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-15">)</span><span·class="w">
202 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="7847508121-16">(</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="7847508121-16">)</span><span·class="w">·</span><span·class="nf">andalso</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-17">(</span><span·class="[·...·truncated·by·diffoscope;·len:·161,·SHA:·5b490f56a70d946aa8fdfd0821905decf8eaca44302c90628933e3567c681eba·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">202 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="5364100819-16">(</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="5364100819-16">)</span><span·class="w">·</span><span·class="nf">andalso</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-17">(</span><span·class="[·...·truncated·by·diffoscope;·len:·161,·SHA:·ac0199746b18e9f97c7acebfc4443972862cd43e26d4d4e19944ff9f12cb1775·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
203 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Default</span><span·class="w">203 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Default</span><span·class="w">
204 ····</span><span·class="n">Addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">get_local_addr</span><span·class="p"·data-group-id="7847508121-18">(</span><span·class="n">Family</span><span·class="p"·data-group-id="7847508121-18">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Pick·an·address</span><span·class="w">204 ····</span><span·class="n">Addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">get_local_addr</span><span·class="p"·data-group-id="5364100819-18">(</span><span·class="n">Family</span><span·class="p"·data-group-id="5364100819-18">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Pick·an·address</span><span·class="w">
205 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-19">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">205 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-19">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">
206 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">206 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">
207 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="7847508121-19">}</span><span·class="p">,</span><span·class="w">207 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="5364100819-19">}</span><span·class="p">,</span><span·class="w">
208 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="7847508121-20">(</span><span·class="n">SockAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-20">)</span><span·class="p">.</span><span·class="w">208 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="5364100819-20">(</span><span·class="n">SockAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-20">)</span><span·class="p">.</span><span·class="w">
  
209 </span><span·class="nf">client</span><span·class="p"·data-group-id="7847508121-21">(</span><span·class="n">ServerPort</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ServerAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-21">)</span><span·class="w">209 </span><span·class="nf">client</span><span·class="p"·data-group-id="5364100819-21">(</span><span·class="n">ServerPort</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ServerAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-21">)</span><span·class="w">
210 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="7847508121-22">(</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="7847508121-22">)</span><span·class="w">·</span><span·class="nf">andalso</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-23">(</span><span·class="[·...·truncated·by·diffoscope;·len:·161,·SHA:·5b490f56a70d946aa8fdfd0821905decf8eaca44302c90628933e3567c681eba·...·]-23">)</span><span·class="w">·</span><span·class="ow">andalso</span><span·class="w">210 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="5364100819-22">(</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="5364100819-22">)</span><span·class="w">·</span><span·class="nf">andalso</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-23">(</span><span·class="[·...·truncated·by·diffoscope;·len:·161,·SHA:·ac0199746b18e9f97c7acebfc4443972862cd43e26d4d4e19944ff9f12cb1775·...·]-23">)</span><span·class="w">·</span><span·class="ow">andalso</span><span·class="w">
211 ·······</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="7847508121-24">(</span><span·class="n">ServerAddr</span><span·class="p"·data-group-id="7847508121-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">211 ·······</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="5364100819-24">(</span><span·class="n">ServerAddr</span><span·class="p"·data-group-id="5364100819-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
212 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">which_family</span><span·class="p"·data-group-id="7847508121-25">(</span><span·class="n">ServerAddr</span><span·class="p"·data-group-id="7847508121-25">)</span><span·class="p">,</span><span·class="w">212 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">which_family</span><span·class="p"·data-group-id="5364100819-25">(</span><span·class="n">ServerAddr</span><span·class="p"·data-group-id="5364100819-25">)</span><span·class="p">,</span><span·class="w">
213 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-26">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">213 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-26">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">
214 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">ServerAddr</span><span·class="p">,</span><span·class="w">214 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">ServerAddr</span><span·class="p">,</span><span·class="w">
215 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="7847508121-26">}</span><span·class="p">,</span><span·class="w">215 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">ServerPort</span><span·class="p"·data-group-id="5364100819-26">}</span><span·class="p">,</span><span·class="w">
216 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="7847508121-27">(</span><span·class="n">SockAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-27">)</span><span·class="p">.</span><span·class="w">216 ····</span><span·class="nf">client</span><span·class="p"·data-group-id="5364100819-27">(</span><span·class="n">SockAddr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-27">)</span><span·class="p">.</span><span·class="w">
  
217 </span><span·class="c1">%%·Send·the·message·to·the·(echo)·server·and·wait·for·the·echo·to·come·back.</span><span·class="w">217 </span><span·class="c1">%%·Send·the·message·to·the·(echo)·server·and·wait·for·the·echo·to·come·back.</span><span·class="w">
218 </span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="7847508121-28">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-28">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·149,·SHA:·b1332e77caace08480bb34baea6d334fce9f7b55eec03b2164c61b1f0303c1f0·...·]-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">218 </span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="5364100819-28">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-28">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·149,·SHA:·f21171290161e824e993991e9dfb42cc43ea5dca7a9c87d21a674379abf05e5e·...·]-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
219 ····</span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="7847508121-30">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="7847508121-31">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="784750812[·...·truncated·by·diffoscope;·len:·55,·SHA:·a455906de6da2d55b76a4d2fc75b76af22b350dfd1c9ef3d3e204a2dab737fa2·...·]-30">)</span><span·class="p">;</span><span·class="w">219 ····</span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="5364100819-30">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="5364100819-31">(</span><span·class="n">Msg</span><span·class="p"·data-group-id="536410081[·...·truncated·by·diffoscope;·len:·55,·SHA:·626273ba5705b973691943519d1881df905408344fbc8040f3de84d7bb1650bd·...·]-30">)</span><span·class="p">;</span><span·class="w">
220 </span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="7847508121-32">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-32">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·151,·SHA:·f211e1603a90b25690d2cb09124e44471311353fefc231a7f35b7bc0294ff19b·...·]-33">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">220 </span><span·class="nf">client_exchange</span><span·class="p"·data-group-id="5364100819-32">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-32">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·151,·SHA:·03d7704d3c912fb8d1662e2dc483e67c1bfed9b2809ac275e46ddab1a870cd49·...·]-33">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
221 ····</span><span·class="ss">ok</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="7847508121-34">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="p"·data-group-id="7847508121-34">)</span><span·class="p">,</span><span·class="w">221 ····</span><span·class="ss">ok</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="5364100819-34">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">infinity</span><span·class="p"·data-group-id="5364100819-34">)</span><span·class="p">,</span><span·class="w">
222 ····</span><span·class="p"·data-group-id="7847508121-35">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="7847508121-35">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·492,·SHA:·e278603b177ab6ee1d767b69a528fcae2bc39ec37a81ae91a4de3a0777f7bba6·...·]-36">)</span><span·class="p">,</span><span·class="w">222 ····</span><span·class="p"·data-group-id="5364100819-35">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="5364100819-35">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·492,·SHA:·7eba9871187d2f5315a7f024a7878efc72948c334b21d1e666d1c250aff46437·...·]-36">)</span><span·class="p">,</span><span·class="w">
223 ····</span><span·class="ss">ok</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="7847508121-38">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7847508121-38">)</span><span·class="p">,</span><span·class="w">223 ····</span><span·class="ss">ok</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5364100819-38">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="5364100819-38">)</span><span·class="p">,</span><span·class="w">
224 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">224 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
  
225 </span><span·class="c1">%%·======================================================================</span><span·class="w">225 </span><span·class="c1">%%·======================================================================</span><span·class="w">
  
226 </span><span·class="c1">%%·===·Server·===</span><span·class="w">226 </span><span·class="c1">%%·===·Server·===</span><span·class="w">
  
227 </span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-39">(</span><span·class="p"·data-group-id="7847508121-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 </span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-39">(</span><span·class="p"·data-group-id="5364100819-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ····</span><span·class="c1">%%·Make·system·choose·port·(and·address)</span><span·class="w">228 ····</span><span·class="c1">%%·Make·system·choose·port·(and·address)</span><span·class="w">
229 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-40">(</span><span·class="mi">0</span><span·class="p"·data-group-id="7847508121-40">)</span><span·class="p">.</span><span·class="w">229 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-40">(</span><span·class="mi">0</span><span·class="p"·data-group-id="5364100819-40">)</span><span·class="p">.</span><span·class="w">
  
230 </span><span·class="c1">%%·This·function·return·the·port·and·address·that·it·actually·uses,</span><span·class="w">230 </span><span·class="c1">%%·This·function·return·the·port·and·address·that·it·actually·uses,</span><span·class="w">
231 </span><span·class="c1">%%·in·case·server/0·or·server/1·(with·a·port·number)·was·used·to·start·it.</span><span·class="w">231 </span><span·class="c1">%%·in·case·server/0·or·server/1·(with·a·port·number)·was·used·to·start·it.</span><span·class="w">
  
232 </span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-41">(</span><span·class="p"·data-group-id="7847508121-42">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·501,·SHA:·02c9f8a49810b0d4b974206553dfffefc4048112e6665cdb6096cf42e01af22f·...·]-41">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">232 </span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-41">(</span><span·class="p"·data-group-id="5364100819-42">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·501,·SHA:·c0697c8329234821a063c90c5b229ce6b79d16e0c6a0522ed9e3ea233a60e7b0·...·]-41">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
233 ····</span><span·class="p"·data-group-id="7847508121-43">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="7847508121-43">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·353,·SHA:·b07efd8a370684b04b68902d279de5a1b20e8b1a77167ae32fe44449a09937fd·...·]-44">)</span><span·class="p">,</span><span·class="w">233 ····</span><span·class="p"·data-group-id="5364100819-43">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sock</span><span·class="p"·data-group-id="5364100819-43">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·353,·SHA:·6150a085fc583e67765a00f762f4ee730e4b79c4634378c4f8dbe4ad239391ec·...·]-44">)</span><span·class="p">,</span><span·class="w">
234 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">bind</span><span·class="p"·data-group-id="7847508121-45">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SockAddr</span><span·class="p"·data-group-id="7847508121-45">)</span><span·class="p">,</span><span·class="w">234 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">bind</span><span·class="p"·data-group-id="5364100819-45">(</span><span·class="n">Sock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SockAddr</span><span·class="p"·data-group-id="5364100819-45">)</span><span·class="p">,</span><span·class="w">
235 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">listen</span><span·class="p"·data-group-id="7847508121-46">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7847508121-46">)</span><span·class="p">,</span><span·class="w">235 ····</span><span·class="ss">ok</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">listen</span><span·class="p"·data-group-id="5364100819-46">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="5364100819-46">)</span><span·class="p">,</span><span·class="w">
236 ····</span><span·class="p"·data-group-id="7847508121-47">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-48">#{</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·412,·SHA:·d7830c3ea0711c962928407b140cc1ee932c687e787e82a82a51e9050e384858·...·]-49">)</span><span·class="p">,</span><span·class="w">236 ····</span><span·class="p"·data-group-id="5364100819-47">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-48">#{</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·412,·SHA:·7b863db0fef1c656e08d0cf86db91f2744f0cec71c52b485e25c07a744bab597·...·]-49">)</span><span·class="p">,</span><span·class="w">
237 ····</span><span·class="n">Acceptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_acceptor</span><span·class="p"·data-group-id="7847508121-50">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="7847508121-50">)</span><span·class="p">,</span><span·class="w">237 ····</span><span·class="n">Acceptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_acceptor</span><span·class="p"·data-group-id="5364100819-50">(</span><span·class="n">Sock</span><span·class="p"·data-group-id="5364100819-50">)</span><span·class="p">,</span><span·class="w">
238 ····</span><span·class="p"·data-group-id="7847508121-51">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-52">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Addr</span><sp[·...·truncated·by·diffoscope;·len:·171,·SHA:·22ae7140b5caa933eca6ebb429996656fcbf4d00025f617b639d92654cbb546b·...·]-51">}</span><span·class="p">;</span><span·class="w">238 ····</span><span·class="p"·data-group-id="5364100819-51">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-52">{</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Addr</span><sp[·...·truncated·by·diffoscope;·len:·171,·SHA:·8668e7ebbe3ac1ff00ea3f93677c6011a45567989653034bc9c908d9bb1ad3d2·...·]-51">}</span><span·class="p">;</span><span·class="w">
  
239 </span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-53">(</span><span·class="n">Port</span><span·class="p"·data-group-id="7847508121-53">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="7847508121-5[·...·truncated·by·diffoscope;·len:·79,·SHA:·0f0cf44b3f28f6bd6d89fcaefc3802fed0ec4d3589b45f464e4acb5f867823b6·...·]-54">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">239 </span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-53">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5364100819-53">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="5364100819-5[·...·truncated·by·diffoscope;·len:·79,·SHA:·d48fd1e398992afaa04c8ebbd963c5493bdf6c2fbfd48c9d3aab96e085515e09·...·]-54">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
240 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Default</span><span·class="w">240 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">inet</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Default</span><span·class="w">
241 ····</span><span·class="n">Addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">get_local_addr</span><span·class="p"·data-group-id="7847508121-55">(</span><span·class="n">Family</span><span·class="p"·data-group-id="7847508121-55">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Pick·an·address</span><span·class="w">241 ····</span><span·class="n">Addr</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">get_local_addr</span><span·class="p"·data-group-id="5364100819-55">(</span><span·class="n">Family</span><span·class="p"·data-group-id="5364100819-55">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·Pick·an·address</span><span·class="w">
242 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-56">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">242 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-56">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">
243 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">243 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">
244 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="7847508121-56">}</span><span·class="p">,</span><span·class="w">244 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="5364100819-56">}</span><span·class="p">,</span><span·class="w">
245 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-57">(</span><span·class="n">SockAddr</span><span·class="p"·data-group-id="7847508121-57">)</span><span·class="p">.</span><span·class="w">245 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-57">(</span><span·class="n">SockAddr</span><span·class="p"·data-group-id="5364100819-57">)</span><span·class="p">.</span><span·class="w">
  
246 </span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-58">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p"·data-group-id="7847508121-58">)</span><span·class="w">246 </span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-58">(</span><span·class="n">Port</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p"·data-group-id="5364100819-58">)</span><span·class="w">
247 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="7847508121-59">(</span><span·class="n">Port</span><span·class="p"·data-group-id="7847508121-59">)</span><span·class="w">·</span><span·class="nf">andalso</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-60">(</span><span·class="n">Por[·...·truncated·by·diffoscope;·len:·150,·SHA:·ccd32d7d3ad1a245ac6571f4d2855f895b4bb550d72ebb6f1283478bca3eb2cb·...·]-60">)</span><span·class="w">·</span><span·class="ow">andalso</span><span·class="w">247 ··</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="5364100819-59">(</span><span·class="n">Port</span><span·class="p"·data-group-id="5364100819-59">)</span><span·class="w">·</span><span·class="nf">andalso</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-60">(</span><span·class="n">Por[·...·truncated·by·diffoscope;·len:·150,·SHA:·0b233e07f82fc9837a4449645db72f4c28609c7d136d122fadd1b94fe8b90a55·...·]-60">)</span><span·class="w">·</span><span·class="ow">andalso</span><span·class="w">
248 ·······</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="7847508121-61">(</span><span·class="n">Addr</span><span·class="p"·data-group-id="7847508121-61">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">248 ·······</span><span·class="nf">is_tuple</span><span·class="p"·data-group-id="5364100819-61">(</span><span·class="n">Addr</span><span·class="p"·data-group-id="5364100819-61">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
249 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">which_family</span><span·class="p"·data-group-id="7847508121-62">(</span><span·class="n">Addr</span><span·class="p"·data-group-id="7847508121-62">)</span><span·class="p">,</span><span·class="w">249 ····</span><span·class="n">Family</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">which_family</span><span·class="p"·data-group-id="5364100819-62">(</span><span·class="n">Addr</span><span·class="p"·data-group-id="5364100819-62">)</span><span·class="p">,</span><span·class="w">
250 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-63">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">250 ····</span><span·class="n">SockAddr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-63">#{</span><span·class="ss">family</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Family</span><span·class="p">,</span><span·class="w">
251 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">251 »       »       ·</span><span·class="ss">addr</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Addr</span><span·class="p">,</span><span·class="w">
252 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="7847508121-63">}</span><span·class="p">,</span><span·class="w">252 »       »       ·</span><span·class="ss">port</span><span·class="w">···</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="5364100819-63">}</span><span·class="p">,</span><span·class="w">
253 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="7847508121-64">(</span><span·class="n">SockAddr</span><span·class="p"·data-group-id="7847508121-64">)</span><span·class="p">.</span><span·class="w">253 ····</span><span·class="nf">server</span><span·class="p"·data-group-id="5364100819-64">(</span><span·class="n">SockAddr</span><span·class="p"·data-group-id="5364100819-64">)</span><span·class="p">.</span><span·class="w">
  
  
254 </span><span·class="c1">%%·---·Echo·Server·-·Acceptor·---</span><span·class="w">254 </span><span·class="c1">%%·---·Echo·Server·-·Acceptor·---</span><span·class="w">
  
255 </span><span·class="nf">start_acceptor</span><span·class="p"·data-group-id="7847508121-65">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="7847508121-65">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">255 </span><span·class="nf">start_acceptor</span><span·class="p"·data-group-id="5364100819-65">(</span><span·class="n">LSock</span><span·class="p"·data-group-id="5364100819-65">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
256 ····</span><span·class="n">Self</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="7847508121-66">(</span><span·class="p"·data-group-id="7847508121-66">)</span><span·class="p">,</span><span·class="w">256 ····</span><span·class="n">Self</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="5364100819-66">(</span><span·class="p"·data-group-id="5364100819-66">)</span><span·class="p">,</span><span·class="w">
257 ····</span><span·class="p"·data-group-id="7847508121-67">{</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p"·data-group-id="7847508121-67">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·635,·SHA:·8e0938d17092c3bccc64f0549e96116ecaa3f460971f5568de28acdc4b60283e·...·]-68">)</span><span·class="p">,</span><span·class="w">257 ····</span><span·class="p"·data-group-id="5364100819-67">{</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p"·data-group-id="5364100819-67">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·635,·SHA:·ccd6f0c93421f821ddb8bce81e4ef78328d8a7ccd6ec3620b58c1ac3f35cb8e2·...·]-68">)</span><span·class="p">,</span><span·class="w">
258 ····</span><span·class="k">receive</span><span·class="w">258 ····</span><span·class="k">receive</span><span·class="w">
259 »       </span><span·class="p"·data-group-id="7847508121-71">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·149,·SHA:·fa364cfb6c4faa6c1974679b0ed3acedfbff76863551b866b5b8b4976e87fbaa·...·]-71">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">259 »       </span><span·class="p"·data-group-id="5364100819-71">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·149,·SHA:·93e9b98cea9cd06c7993dd50ab92722e189a61d8660f10c855909c0175950373·...·]-71">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
260 »       ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="7847508121-72">(</span><span·class="p"·data-group-id="7847508121-73">{</span><span·class="ss">failed_starting_acceptor</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="7847508121-73">}</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·61cfcae2830cf94828dcccdabbcf8c350683b17968f19e3dc3e03f9a8c9394e7·...·]-72">)</span><span·class="p">;</span><span·class="w">260 »       ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="5364100819-72">(</span><span·class="p"·data-group-id="5364100819-73">{</span><span·class="ss">failed_starting_acceptor</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="5364100819-73">}</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·d0f10fc89a73e65f63139ec3a1527802e0167f4cd5a15e659d3cb2e216a732c3·...·]-72">)</span><span·class="p">;</span><span·class="w">
261 »       </span><span·class="p"·data-group-id="7847508121-74">{</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">started</span><span·class="p"·data-group-id="7847508121-74">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">261 »       </span><span·class="p"·data-group-id="5364100819-74">{</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">started</span><span·class="p"·data-group-id="5364100819-74">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
262 »       ····</span><span·class="c1">%%·Transfer·ownership</span><span·class="w">262 »       ····</span><span·class="c1">%%·Transfer·ownership</span><span·class="w">
263 »       ····</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">setopt</span><span·class="p"·data-group-id="7847508121-75">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">owner</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·62,·SHA:·1c909b1d9533bd0f703594671dbd6f4dddac6a4b063d2b0d5fe635096973017d·...·]-75">)</span><span·class="p">,</span><span·class="w">263 »       ····</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">setopt</span><span·class="p"·data-group-id="5364100819-75">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">otp</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">owner</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·62,·SHA:·e3f6919ae8a10863102cd4a2ce256fad2c8a913910d4b2a022b5fc249c078251·...·]-75">)</span><span·class="p">,</span><span·class="w">
264 »       ····</span><span·class="n">Pid</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-76">{</span><span·class="nf">self</span><span·class="p"·data-group-id="7847508121-77">(</span><span·class="p"·data-group-id="7847508121-77">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·690e74cea0265235523351a32ddb128149379adf029c81adb43f941d3c343e56·...·]-76">}</span><span·class="p">,</span><span·class="w">264 »       ····</span><span·class="n">Pid</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-76">{</span><span·class="nf">self</span><span·class="p"·data-group-id="5364100819-77">(</span><span·class="p"·data-group-id="5364100819-77">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·ba08103320b71e04d9d802421261f8cf1e2b3af93ac604306f55acf03b4d5d4b·...·]-76">}</span><span·class="p">,</span><span·class="w">
265 »       ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="7847508121-78">(</span><span·class="n">MRef</span><span·class="p"·data-group-id="7847508121-78">)</span><span·class="p">,</span><span·class="w">265 »       ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">demonitor</span><span·class="p"·data-group-id="5364100819-78">(</span><span·class="n">MRef</span><span·class="p"·data-group-id="5364100819-78">)</span><span·class="p">,</span><span·class="w">
266 »       ····</span><span·class="n">Pid</span><span·class="w">266 »       ····</span><span·class="n">Pid</span><span·class="w">
267 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">267 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
268 ····268 ····
269 </span><span·class="nf">acceptor_init</span><span·class="p"·data-group-id="7847508121-79">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LSock</span><span·class="p"·data-group-id="7847508121-79">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">269 </span><span·class="nf">acceptor_init</span><span·class="p"·data-group-id="5364100819-79">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LSock</span><span·class="p"·data-group-id="5364100819-79">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
270 ····</span><span·class="n">Parent</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-80">{</span><span·class="nf">self</span><span·class="p"·data-group-id="7847508121-81">(</span><span·class="p"·data-group-id="7847508121-81">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">started</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·49c99afacaf7e6557f45364200b3442180d99c221a8ab07bd3462e6210791e0c·...·]-80">}</span><span·class="p">,</span><span·class="w">270 ····</span><span·class="n">Parent</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-80">{</span><span·class="nf">self</span><span·class="p"·data-group-id="5364100819-81">(</span><span·class="p"·data-group-id="5364100819-81">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">started</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·0df6599a2804cc5ef20f1f19c72b8fb1eaca0a7cde6cf7d6f27c0419117ec7b6·...·]-80">}</span><span·class="p">,</span><span·class="w">
271 ····</span><span·class="k">receive</span><span·class="w">271 ····</span><span·class="k">receive</span><span·class="w">
272 »       </span><span·class="p"·data-group-id="7847508121-82">{</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="p"·data-group-id="7847508121-82">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">272 »       </span><span·class="p"·data-group-id="5364100819-82">{</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="p"·data-group-id="5364100819-82">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
273 »       ····</span><span·class="ss">ok</span><span·class="w">273 »       ····</span><span·class="ss">ok</span><span·class="w">
274 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">274 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
275 ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="7847508121-83">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="7847508121-83">)</span><span·class="p">.</span><span·class="w">275 ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="5364100819-83">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="5364100819-83">)</span><span·class="p">.</span><span·class="w">
  
276 </span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="7847508121-84">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·c592b895b303ee9d720fd22f6b49dc45025438fe05747a9e38bc981803ef1028·...·]-84">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">276 </span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="5364100819-84">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·5ad3482507ba0a50c80b8ec5c183f346dc792b9b122bb84d96bfd33997629290·...·]-84">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
277 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">accept</span><span·class="p"·data-group-id="7847508121-85">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">nowait</span><span·class="p"·data-group-id="7847508121-85">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">277 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">socket</span><span·class="p">:</span><span·class="nf">accept</span><span·class="p"·data-group-id="5364100819-85">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">nowait</span><span·class="p"·data-group-id="5364100819-85">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
278 »       </span><span·class="p"·data-group-id="7847508121-86">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ASock</span><span·class="p"·data-group-id="7847508121-86">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">278 »       </span><span·class="p"·data-group-id="5364100819-86">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ASock</span><span·class="p"·data-group-id="5364100819-86">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
279 »       ····</span><span·class="nf">start_handler</span><span·class="p"·data-group-id="7847508121-87">(</span><span·class="n">ASock</span><span·class="p"·data-group-id="7847508121-87">)</span><span·class="p">,</span><span·class="w">279 »       ····</span><span·class="nf">start_handler</span><span·class="p"·data-group-id="5364100819-87">(</span><span·class="n">ASock</span><span·class="p"·data-group-id="5364100819-87">)</span><span·class="p">,</span><span·class="w">
280 »       ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="7847508121-88">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="7847508121-88">)</span><span·class="p">;</span><span·class="w">280 »       ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="5364100819-88">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p"·data-group-id="5364100819-88">)</span><span·class="p">;</span><span·class="w">
281 »       </span><span·class="p"·data-group-id="7847508121-89">{</span><span·class="ss">select</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SelectInfo</span><span·class="p"·data-group-id="7847508121-89">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">281 »       </span><span·class="p"·data-group-id="5364100819-89">{</span><span·class="ss">select</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SelectInfo</span><span·class="p"·data-group-id="5364100819-89">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
282 »       ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="7847508121-90">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SelectInfo</span><span·class="p"·data-group-id="7847508121-90">)</span><span·class="p">;</span><span·class="w">282 »       ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="5364100819-90">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SelectInfo</span><span·class="p"·data-group-id="5364100819-90">)</span><span·class="p">;</span><span·class="w">
283 »       </span><span·class="p"·data-group-id="7847508121-91">{</span><span·class="ss">completion</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CompletionInfo</span><span·class="p"·data-group-id="7847508121-91">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">283 »       </span><span·class="p"·data-group-id="5364100819-91">{</span><span·class="ss">completion</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CompletionInfo</span><span·class="p"·data-group-id="5364100819-91">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
284 »       ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="7847508121-92">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CompletionInfo</span><span·class="p"·data-group-id="7847508121-92">)</span><span·class="p">;</span><span·class="w">284 »       ····</span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="5364100819-92">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CompletionInfo</span><span·class="p"·data-group-id="5364100819-92">)</span><span·class="p">;</span><span·class="w">
285 »       </span><span·class="p"·data-group-id="7847508121-93">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="7847508121-93">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">285 »       </span><span·class="p"·data-group-id="5364100819-93">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5364100819-93">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
286 »       ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="7847508121-94">(</span><span·class="p"·data-group-id="7847508121-95">{</span><span·class="ss">accept_failed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="7847508121-95">}</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·1e2c685a5579477a4a2d712636639dba850b1e172beca5112f77ffc2b9472a17·...·]-94">)</span><span·class="w">286 »       ····</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="5364100819-94">(</span><span·class="p"·data-group-id="5364100819-95">{</span><span·class="ss">accept_failed</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5364100819-95">}</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·3b30cedf1e2cc2d6845562b8b931a1c370c8b29df1977a354850823fa2e92965·...·]-94">)</span><span·class="w">
287 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">287 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
  
288 </span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="7847508121-96">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7847508121-97">{</span><span·class="ss">select_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">acc[·...·truncated·by·diffoscope;·len:·188,·SHA:·7f27aa5adfbba146c61671729f8dd187b968a00a662c37c20605c3454522e360·...·]-96">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">288 </span><span·class="nf">acceptor_loop</span><span·class="p"·data-group-id="5364100819-96">(</span><span·class="n">LSock</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5364100819-97">{</span><span·class="ss">select_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">acc[·...·truncated·by·diffoscope;·len:·188,·SHA:·5a0ec0668a12f2f2ff62b50774604e332352bc72a64ab15fbb04df394c48e13b·...·]-96">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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Offset 142, 31 lines modifiedOffset 142, 31 lines modified
142 </h2>142 </h2>
143 <p>All·tracing·is·done·within·a·trace·session.·Trace·sessions·can·be143 <p>All·tracing·is·done·within·a·trace·session.·Trace·sessions·can·be
144 <a·href="#session_create/3">created</a>·and·<a·href="#session_destroy/1">destroyed</a>144 <a·href="#session_create/3">created</a>·and·<a·href="#session_destroy/1">destroyed</a>
145 dynamically.·Each·session·has·its·own·tracer·that·will·receive·all·trace145 dynamically.·Each·session·has·its·own·tracer·that·will·receive·all·trace
146 messages.·Several·sessions·can·exist·at·the·same·time·without·interfering·with146 messages.·Several·sessions·can·exist·at·the·same·time·without·interfering·with
147 each·other.·When·a·trace·session·is·destroyed,·all·its·trace·settings·are147 each·other.·When·a·trace·session·is·destroyed,·all·its·trace·settings·are
148 automatically·cleaned·up.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Create·a·tracer·process·that·will·receive·the·trace·events</span><span·class="gp·unselectable">148 automatically·cleaned·up.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Create·a·tracer·process·that·will·receive·the·trace·events</span><span·class="gp·unselectable">
149 1&gt;·</span><span·class="n">Tracer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="0521296440-1">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="0521296440-2">(</span><span·class="p"·data-group-id="0521296440-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><s[·...·truncated·by·diffoscope;·len:·945,·SHA:·7a3ef8a5751145f21d29476a30678ac46f0e9f3acca1ca588f9bef496f76f679·...·]-1">)</span><span·class="p">.</span><span·class="w">149 1&gt;·</span><span·class="n">Tracer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2248182986-1">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="2248182986-2">(</span><span·class="p"·data-group-id="2248182986-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><s[·...·truncated·by·diffoscope;·len:·945,·SHA:·1f9dde929c1376c340e1b139270e58f8f3a935983585bf3fa5a1636171c8b49b·...·]-1">)</span><span·class="p">.</span><span·class="w">
150 </span><span·class="o">&lt;</span><span·class="mf">0.91</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">150 </span><span·class="o">&lt;</span><span·class="mf">0.91</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">
151 </span><span·class="c1">%%·Create·a·session·using·the·Tracer</span><span·class="gp·unselectable">151 </span><span·class="c1">%%·Create·a·session·using·the·Tracer</span><span·class="gp·unselectable">
152 2&gt;·</span><span·class="n">Session</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">session_create</span><span·class="p"·data-group-id="0521296440-6">(</span><span·class="ss">my_session</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tracer</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0521296440-7">[</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·72,·SHA:·222e99204a9c25488d35f0a6a650dac524a9f83bebda7eed240582b81a71bb8c·...·]-6">)</span><span·class="p">.</span><span·class="w">152 2&gt;·</span><span·class="n">Session</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">session_create</span><span·class="p"·data-group-id="2248182986-6">(</span><span·class="ss">my_session</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tracer</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2248182986-7">[</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·72,·SHA:·1741a5e809a1031f1cb0feacff412325b724795b24700cb575ccd027d40ba575·...·]-6">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="p"·data-group-id="0521296440-8">{</span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.1543805153</span><span·class="p">.</span><span·class="mf">1548353537.92331</span><span·class="o">&gt;</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·248,·SHA:·3e25ffeca92acbdab70cb76fb68379cc543199152733667a637fae50024c124b·...·]-8">}</span><span·class="w">153 </span><span·class="p"·data-group-id="2248182986-8">{</span><span·class="p">#</span><span·class="n">Ref</span><span·class="o">&lt;</span><span·class="mf">0.1543805153</span><span·class="p">.</span><span·class="mf">1548353537.92331</span><span·class="o">&gt;</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·248,·SHA:·01f6961fa304a2bc86e9c1edccbed0e6c6247279f9c52403bf97a4ed72bff402·...·]-8">}</span><span·class="w">
154 </span><span·class="c1">%%·Setup·call·tracing·on·self()</span><span·class="gp·unselectable">154 </span><span·class="c1">%%·Setup·call·tracing·on·self()</span><span·class="gp·unselectable">
155 3&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">process</span><span·class="p"·data-group-id="0521296440-10">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="0521296440-11">(</span><span·class="p"·data-group-id="0521296440-11">)</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·282,·SHA:·a617cb54bc260049dde3c303b65e0a45d892d6116816fb62f2e800428a0129e3·...·]-10">)</span><span·class="p">.</span><span·class="w">155 3&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">process</span><span·class="p"·data-group-id="2248182986-10">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="2248182986-11">(</span><span·class="p"·data-group-id="2248182986-11">)</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·282,·SHA:·2bb239a45961c7f42999748a74c16f7f24fd786c58b49b291d05c9770e6e58ba·...·]-10">)</span><span·class="p">.</span><span·class="w">
156 </span><span·class="mi">1</span><span·class="w">156 </span><span·class="mi">1</span><span·class="w">
157 </span><span·class="c1">%%·Setup·call·tracing·on·lists:seq/2</span><span·class="gp·unselectable">157 </span><span·class="c1">%%·Setup·call·tracing·on·lists:seq/2</span><span·class="gp·unselectable">
158 4&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">function</span><span·class="p"·data-group-id="0521296440-13">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0521296440-14">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">seq</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·435,·SHA:·acf411af5e786f2ae0d7d7934e600c738ba46a2a19fd87585aa7d703658684c0·...·]-13">)</span><span·class="p">.</span><span·class="w">158 4&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">function</span><span·class="p"·data-group-id="2248182986-13">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2248182986-14">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">seq</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·435,·SHA:·25a5ee9e60db34a460172c1cc576db552bf38a56efb0d6e91fdbe8f059c9fa89·...·]-13">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="mi">1</span><span·class="w">159 </span><span·class="mi">1</span><span·class="w">
160 </span><span·class="c1">%%·Call·the·traced·function</span><span·class="gp·unselectable">160 </span><span·class="c1">%%·Call·the·traced·function</span><span·class="gp·unselectable">
161 5&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0521296440-17">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p"·data-group-id="0521296440-17">)</span><span·class="p">.</span><span·class="w">161 5&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="2248182986-17">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p"·data-group-id="2248182986-17">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="p"·data-group-id="0521296440-18">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.89</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="ss">call</sp[·...·truncated·by·diffoscope;·len:·463,·SHA:·a515ed5ddacb1acb8acf5a9c7b12f4b03f794f2c5e4bd9a4edc1a42f12f4137e·...·]-18">}</span><span·class="w">·</span><span·class="c1">%·The·trace·message</span><span·class="w">162 </span><span·class="p"·data-group-id="2248182986-18">{</span><span·class="nb">trace</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.89</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="ss">call</sp[·...·truncated·by·diffoscope;·len:·463,·SHA:·a9b1980b499a6b79debcc8361b4affd84706f1870836137f65e34e605ca5d2aa·...·]-18">}</span><span·class="w">·</span><span·class="c1">%·The·trace·message</span><span·class="w">
163 </span><span·class="p"·data-group-id="0521296440-21">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class=[·...·truncated·by·diffoscope;·len:·275,·SHA:·d883c19f3556030e912a5e76acfe609652b498d64ab02c550ed7ca25a030dc34·...·]-21">]</span><span·class="w">·</span><span·class="c1">%·The·return·value</span><span·class="w">163 </span><span·class="p"·data-group-id="2248182986-21">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class=[·...·truncated·by·diffoscope;·len:·275,·SHA:·d82cca08ce24cf58e0936c4cbddd73a1f67ff8d02ea1bc959b32fc45ecaf59b9·...·]-21">]</span><span·class="w">·</span><span·class="c1">%·The·return·value</span><span·class="w">
164 </span><span·class="c1">%%·Cleanup·the·trace·session</span><span·class="gp·unselectable">164 </span><span·class="c1">%%·Cleanup·the·trace·session</span><span·class="gp·unselectable">
165 6&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">session_destroy</span><span·class="p"·data-group-id="0521296440-22">(</span><span·class="n">Session</span><span·class="p"·data-group-id="0521296440-22">)</span><span·class="p">.</span><span·class="w">165 6&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">session_destroy</span><span·class="p"·data-group-id="2248182986-22">(</span><span·class="n">Session</span><span·class="p"·data-group-id="2248182986-22">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="ss">ok</span></code></pre><h2·id="module-node-local-tracing-only"·class="section-heading">166 </span><span·class="ss">ok</span></code></pre><h2·id="module-node-local-tracing-only"·class="section-heading">
167 ··<a·href="#module-node-local-tracing-only"·class="hover-link">167 ··<a·href="#module-node-local-tracing-only"·class="hover-link">
168 ····<i·class="ri-link-m"·aria-hidden="true"></i>168 ····<i·class="ri-link-m"·aria-hidden="true"></i>
169 ··</a>169 ··</a>
170 ··<span·class="text">Node·Local·Tracing·Only</span>170 ··<span·class="text">Node·Local·Tracing·Only</span>
171 </h2>171 </h2>
172 <p>The·functions·in·this·module·only·operates·on·the·local·node.·That·is,·both·the172 <p>The·functions·in·this·module·only·operates·on·the·local·node.·That·is,·both·the
Offset 1288, 17 lines modifiedOffset 1288, 17 lines modified
1288 <code·class="inline">undefined</code>·if·the·sender·is·not·known·(which·can·be·the·case·for·remote1288 <code·class="inline">undefined</code>·if·the·sender·is·not·known·(which·can·be·the·case·for·remote
1289 senders).·<code·class="inline">Msg</code>·is·the·message·term.·The·pid·of·the·receiving·process·can·be1289 senders).·<code·class="inline">Msg</code>·is·the·message·term.·The·pid·of·the·receiving·process·can·be
1290 accessed·with·the·guard·function·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>.·An·empty·list·is·the·same·as1290 accessed·with·the·guard·function·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>.·An·empty·list·is·the·same·as
1291 <code·class="inline">true</code>.·For·more·information,·see·section1291 <code·class="inline">true</code>.·For·more·information,·see·section
1292 <a·href="../../../../erts-15.2.6/doc/html/match_spec.html">Match·Specifications·in·Erlang</a>·in·the·User's·Guide1292 <a·href="../../../../erts-15.2.6/doc/html/match_spec.html">Match·Specifications·in·Erlang</a>·in·the·User's·Guide
1293 for·the·ERTS·application.</p></li><li><p><strong><code·class="inline">true</code></strong>·-·Enable·tracing·for·all·received·messages·(to·<code·class="inline">'receive'</code>·traced1293 for·the·ERTS·application.</p></li><li><p><strong><code·class="inline">true</code></strong>·-·Enable·tracing·for·all·received·messages·(to·<code·class="inline">'receive'</code>·traced
1294 processes).·Any·match·specification·is·removed.·<em>This·is·the·default</em>.</p></li><li><p><strong><code·class="inline">false</code></strong>·-·Disable·tracing·for·all·received·messages.·Any·match1294 processes).·Any·match·specification·is·removed.·<em>This·is·the·default</em>.</p></li><li><p><strong><code·class="inline">false</code></strong>·-·Disable·tracing·for·all·received·messages.·Any·match
1295 specification·is·removed.</p></li></ul><p>Argument·<code·class="inline">FlagList</code>·must·be·<code·class="inline">[]</code>·for·receive·tracing.</p><p>The·return·value·is·always·<code·class="inline">1</code>.</p><p><em>Examples:</em></p><p>Only·trace·messages·from·a·specific·process·<code·class="inline">Pid</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="1334413066-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1334413066-2">[</span><span·class="p"·data-group-id="1334413066-3">{</span><span·class="p"·data-group-id="1334413066-4">[</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="1334413066-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="1334413066-5">[</span><span·class="p"·data-group-id="1334413066-5">]</span><span·class="p">,</span><span·class="p"·data-group-id="1334413066-6">[</span><span·class="p"·data-group-id="1334413066-6">]</span><span·class="p"·data-group-id="1334413066-3">}</span><span·class="p"·data-group-id="1334413066-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1334413066-7">[</span><span·class="p"·data-group-id="1334413066-7">]</span><span·class="p"·data-group-id="1334413066-1">)</span><span·class="p">.</span><span·class="w"> 
1296 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·matching·<code·class="inline">{reply,·_}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="4076108650-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4076108650-2">[</span><span·class="p"·data-group-id="4076108650-3">{</span><span·class="p"·data-group-id="4076108650-4">[</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4076108650-5">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="4076108650-5">}</span><span·class="p"·data-group-id="4076108650-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="4076108650-6">[</span><span·class="p"·data-group-id="4076108650-6">]</span><span·class="p">,</span><span·class="p"·data-group-id="4076108650-7">[</span><span·class="p"·data-group-id="4076108650-7">]</span><span·class="p"·data-group-id="4076108650-3">}</span><span·class="p"·data-group-id="4076108650-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4076108650-8">[</span><span·class="p"·data-group-id="4076108650-8">]</span><span·class="p"·data-group-id="4076108650-1">)</span><span·class="p">.</span><span·class="w"> 
1297 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·from·other·nodes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">recv</s[·...·truncated·by·diffoscope;·len:·1471,·SHA:·5b638e75b441ef4585bcd1933640a89da36b18c58b6139c379453b54f081a6e0·...·]-1">)</span><span·class="p">.</span><span·class="w">1295 specification·is·removed.</p></li></ul><p>Argument·<code·class="inline">FlagList</code>·must·be·<code·class="inline">[]</code>·for·receive·tracing.</p><p>The·return·value·is·always·<code·class="inline">1</code>.</p><p><em>Examples:</em></p><p>Only·trace·me[·...·truncated·by·diffoscope;·len:·1310,·SHA:·d9204c1487bcbafdb1003b5bf6d072b7029e24fceb4042380e6fa94bc778befe·...·]-1">)</span><span·class="p">.</span><span·class="w">
 1296 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·matching·<code·class="inline">{reply,·_}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="1345315709-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1345315709-2">[</span><span·class="p"·data-group-id="1345315709-3">{</span><span·class="p"·data-group-id="1345315709-4">[</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1345315709-5">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="1345315709-5">}</span><span·class="p"·data-group-id="1345315709-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="1345315709-6">[</span><span·class="p"·data-group-id="1345315709-6">]</span><span·class="p">,</span><span·class="p"·data-group-id="1345315709-7">[</span><span·class="p"·data-group-id="1345315709-7">]</span><span·class="p"·data-group-id="1345315709-3">}</span><span·class="p"·data-group-id="1345315709-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1345315709-8">[</span><span·class="p"·data-group-id="1345315709-8">]</span><span·class="p"·data-group-id="1345315709-1">)</span><span·class="p">.</span><span·class="w">
 1297 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·from·other·nodes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">recv</span><span·class="p"·data-group-id="0712831608-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0712831608-2">[</span><span·class="p"·data-group-id="0712831608-3">{</span><span·class="p"·data-group-id="0712831608-4">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;_&#39;</span><span·class="p"·data-group-id="0712831608-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="0712831608-5">[</span><span·class="p"·data-group-id="0712831608-6">{</span><span·class="ss">&#39;=/=&#39;</span><span·class="p">,</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="0712831608-7">{</span><span·class="nb">node</span><span·class="p"·data-group-id="0712831608-7">}</span><span·class="p"·data-group-id="0712831608-6">}</span><span·class="p"·data-group-id="0712831608-5">]</span><span·class="p">,</span><span·class="p"·data-group-id="0712831608-8">[</span><span·class="p"·data-group-id="0712831608-8">]</span><span·class="p"·data-group-id="0712831608-3">}</span><span·class="p"·data-group-id="0712831608-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0712831608-9">[</span><span·class="p"·data-group-id="0712831608-9">]</span><span·class="p"·data-group-id="0712831608-1">)</span><span·class="p">.</span><span·class="w">
1298 </span><span·class="mi">1</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>A·match·specification·for·<code·class="inline">'receive'</code>·trace·can·use·all·guard·and·body1298 </span><span·class="mi">1</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>A·match·specification·for·<code·class="inline">'receive'</code>·trace·can·use·all·guard·and·body
1299 functions·except·<code·class="inline">caller</code>,·<code·class="inline">is_seq_trace</code>,·<code·class="inline">get_seq_token</code>,·<code·class="inline">set_seq_token</code>,1299 functions·except·<code·class="inline">caller</code>,·<code·class="inline">is_seq_trace</code>,·<code·class="inline">get_seq_token</code>,·<code·class="inline">set_seq_token</code>,
1300 <code·class="inline">enable_trace</code>,·<code·class="inline">disable_trace</code>,·<code·class="inline">trace</code>,·<code·class="inline">silent</code>,·and·<code·class="inline">process_dump</code>.</p></section><p>Fails·by·raising·an·error·exception·with·an·error·reason·of:</p><ul><li><p><strong><code·class="inline">badarg</code></strong>·-·If·an·argument·is·invalid.</p></li><li><p><strong><code·class="inline">system_limit</code></strong>·-·If·a·match·specification·passed·as·argument·has·excessive1300 <code·class="inline">enable_trace</code>,·<code·class="inline">disable_trace</code>,·<code·class="inline">trace</code>,·<code·class="inline">silent</code>,·and·<code·class="inline">process_dump</code>.</p></section><p>Fails·by·raising·an·error·exception·with·an·error·reason·of:</p><ul><li><p><strong><code·class="inline">badarg</code></strong>·-·If·an·argument·is·invalid.</p></li><li><p><strong><code·class="inline">system_limit</code></strong>·-·If·a·match·specification·passed·as·argument·has·excessive
1301 nesting·which·causes·scheduler·stack·exhaustion·for·the·scheduler·that·the1301 nesting·which·causes·scheduler·stack·exhaustion·for·the·scheduler·that·the
1302 calling·process·is·executing·on.1302 calling·process·is·executing·on.
1303 <a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html#sched_thread_stack_size">Scheduler·stack·size</a>·can·be·configured1303 <a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html#sched_thread_stack_size">Scheduler·stack·size</a>·can·be·configured
1304 when·starting·the·runtime·system.</p></li></ul>1304 when·starting·the·runtime·system.</p></li></ul>
Offset 1339, 18 lines modifiedOffset 1339, 18 lines modified
1339 the·list·<code·class="inline">[Receiver,·Msg]</code>.·<code·class="inline">Receiver</code>·is·the·process·or·port·identity·of·the1339 the·list·<code·class="inline">[Receiver,·Msg]</code>.·<code·class="inline">Receiver</code>·is·the·process·or·port·identity·of·the
1340 receiver·and·<code·class="inline">Msg</code>·is·the·message·term.·The·pid·of·the·sending·process·can·be1340 receiver·and·<code·class="inline">Msg</code>·is·the·message·term.·The·pid·of·the·sending·process·can·be
1341 accessed·with·the·guard·function·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>.·An·empty·list·is·the·same·as1341 accessed·with·the·guard·function·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>.·An·empty·list·is·the·same·as
1342 <code·class="inline">true</code>.·For·more·information,·see·section1342 <code·class="inline">true</code>.·For·more·information,·see·section
1343 <a·href="../../../../erts-15.2.6/doc/html/match_spec.html">Match·Specifications·in·Erlang</a>·in·the·User's·Guide1343 <a·href="../../../../erts-15.2.6/doc/html/match_spec.html">Match·Specifications·in·Erlang</a>·in·the·User's·Guide
1344 for·the·ERTS·application.</p></li><li><p><strong><code·class="inline">true</code></strong>·-·Enable·tracing·for·all·sent·messages·(from·<code·class="inline">send</code>·traced1344 for·the·ERTS·application.</p></li><li><p><strong><code·class="inline">true</code></strong>·-·Enable·tracing·for·all·sent·messages·(from·<code·class="inline">send</code>·traced
1345 processes).·Any·match·specification·is·removed.</p></li><li><p><strong><code·class="inline">false</code></strong>·-·Disable·tracing·for·all·sent·messages.·Any·match·specification1345 processes).·Any·match·specification·is·removed.</p></li><li><p><strong><code·class="inline">false</code></strong>·-·Disable·tracing·for·all·sent·messages.·Any·match·specification
1346 is·removed.</p></li></ul><p>Argument·<code·class="inline">FlagList</code>·must·be·<code·class="inline">[]</code>.</p><p>The·return·value·is·always·<code·class="inline">1</code>.</p><p><em>Examples:</em></p><p>Only·trace·messages·to·a·specific·process·<code·class="inline">Pid</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="1430233367-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1430233367-2">[</span><span·class="p"·data-group-id="1430233367-3">{</span><span·class="p"·data-group-id="1430233367-4">[</sp[·...·truncated·by·diffoscope;·len:·726,·SHA:·6023e0dcc0a47398b0fb28af0b8ad79ec41a500017604ceb55b7fe9ba0dbf96f·...·]-1">)</span><span·class="p">.</span><span·class="w">1346 is·removed.</p></li></ul><p>Argument·<code·class="inline">FlagList</code>·must·be·<code·class="inline">[]</code>.</p><p>The·return·value·is·always·<code·class="inline">1</code>.</p><p><em>Examples:</em></p><p>Only·trace·messages·to·a·specific·process·<code·class="inline">Pid</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="6634631141-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6634631141-2">[</span><span·class="p"·data-group-id="6634631141-3">{</span><span·class="p"·data-group-id="6634631141-4">[</sp[·...·truncated·by·diffoscope;·len:·726,·SHA:·fa2e06cd3c73172007638a5297f3abfb87cc9966963476d087a77423fa63af1c·...·]-1">)</span><span·class="p">.</span><span·class="w">
1347 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·matching·<code·class="inline">{reply,·_}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="5289097707-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5289097707-2">[</span><span·class="p"·data-group-id="5289097707-3">{</span><span·class="p"·data-group-id="5289097707-4">[</sp[·...·truncated·by·diffoscope;·len:·894,·SHA:·a76b0889fdd74578d65a17fdba97ff10fb2d9cd27f1cc35b1022648a60bdd238·...·]-1">)</span><span·class="p">.</span><span·class="w">1347 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·matching·<code·class="inline">{reply,·_}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="8232299579-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8232299579-2">[</span><span·class="p"·data-group-id="8232299579-3">{</span><span·class="p"·data-group-id="8232299579-4">[</sp[·...·truncated·by·diffoscope;·len:·894,·SHA:·dc3d17d96c64afc34d8a53e5f67e27ad082c1876d86b6fa0463b2fc30a2a85f6·...·]-1">)</span><span·class="p">.</span><span·class="w">
1348 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·sent·to·the·sender·itself:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="0221520545-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0221520545-2">[</span><span·class="p"·data-group-id="0221520545-3">{</span><span·class="p"·data-group-id="0221520545-4">[</sp[·...·truncated·by·diffoscope;·len:·1097,·SHA:·5dd7cdc98a44f0ae08acf8366d220f5bc615759ddaac0c8f6e086c8dd96089ab·...·]-1">)</span><span·class="p">.</span><span·class="w">1348 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·sent·to·the·sender·itself:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="9290233683-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9290233683-2">[</span><span·class="p"·data-group-id="9290233683-3">{</span><span·class="p"·data-group-id="9290233683-4">[</sp[·...·truncated·by·diffoscope;·len:·1097,·SHA:·d827eeabd35a9a40d364eb743cd00730a59897f05a3113b7095d96c5efc506d2·...·]-1">)</span><span·class="p">.</span><span·class="w">
1349 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·sent·to·other·nodes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="2408283254-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2408283254-2">[</span><span·class="p"·data-group-id="2408283254-3">{</span><span·class="p"·data-group-id="2408283254-4">[</sp[·...·truncated·by·diffoscope;·len:·1257,·SHA:·0d5c3cec80d5d74dc387a00d12f6d280a83a22ec7fceb705785523fddf34b964·...·]-1">)</span><span·class="p">.</span><span·class="w">1349 </span><span·class="mi">1</span></code></pre><p>Only·trace·messages·sent·to·other·nodes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">trace</span><span·class="p">:</span><span·class="nf">send</span><span·class="p"·data-group-id="0028856136-1">(</span><span·class="n">Session</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0028856136-2">[</span><span·class="p"·data-group-id="0028856136-3">{</span><span·class="p"·data-group-id="0028856136-4">[</sp[·...·truncated·by·diffoscope;·len:·1257,·SHA:·55a4ba3e74027888c3eb354f093c2ff065bb32b06d7d10acd8d944445389397e·...·]-1">)</span><span·class="p">.</span><span·class="w">
1350 </span><span·class="mi">1</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>A·match·specification·for·<code·class="inline">send</code>·trace·can·use·all·guard·and·body·functions1350 </span><span·class="mi">1</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>A·match·specification·for·<code·class="inline">send</code>·trace·can·use·all·guard·and·body·functions
1351 except·<code·class="inline">caller</code>.</p></section><p>Fails·by·raising·an·error·exception·with·an·error·reason·of:</p><ul><li><p><strong><code·class="inline">badarg</code></strong>·-·If·an·argument·is·invalid.</p></li><li><p><strong><code·class="inline">system_limit</code></strong>·-·If·a·match·specification·passed·as·argument·has·excessive1351 except·<code·class="inline">caller</code>.</p></section><p>Fails·by·raising·an·error·exception·with·an·error·reason·of:</p><ul><li><p><strong><code·class="inline">badarg</code></strong>·-·If·an·argument·is·invalid.</p></li><li><p><strong><code·class="inline">system_limit</code></strong>·-·If·a·match·specification·passed·as·argument·has·excessive
1352 nesting·which·causes·scheduler·stack·exhaustion·for·the·scheduler·that·the1352 nesting·which·causes·scheduler·stack·exhaustion·for·the·scheduler·that·the
1353 calling·process·is·executing·on.1353 calling·process·is·executing·on.
1354 <a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html#sched_thread_stack_size">Scheduler·stack·size</a>·can·be·configured1354 <a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html#sched_thread_stack_size">Scheduler·stack·size</a>·can·be·configured
1355 when·starting·the·runtime·system.</p></li></ul>1355 when·starting·the·runtime·system.</p></li></ul>
1356 ··</section>1356 ··</section>
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1483 ········Built·using1483 ········Built·using
1484 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1484 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1485 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1485 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1486 ······</p>1486 ······</p>
1487 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1487 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1488 ····</footer>1488 ····</footer>
1489 ··</div>1489 ··</div>
1490 </main>1490 </main>
1491 </div>1491 </div>
1492 <script>1492 <script>
1493 ··function·mermaidLoaded()·{1493 ··function·mermaidLoaded()·{
1494 ····mermaid.initialize({1494 ····mermaid.initialize({
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532 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the532 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
533 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>533 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
534 ······</p>534 ······</p>
535 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>535 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
536 ····</footer>536 ····</footer>
537 ··</div>537 ··</div>
538 </main>538 </main>
539 </div>539 </div>
540 <script>540 <script>
541 ··function·mermaidLoaded()·{541 ··function·mermaidLoaded()·{
542 ····mermaid.initialize({542 ····mermaid.initialize({
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144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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301 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>301 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
302 ······</p>302 ······</p>
303 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>303 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
304 ····</footer>304 ····</footer>
305 ··</div>305 ··</div>
306 </main>306 </main>
307 </div>307 </div>
308 <script>308 <script>
309 ··function·mermaidLoaded()·{309 ··function·mermaidLoaded()·{
310 ····mermaid.initialize({310 ····mermaid.initialize({
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3072 ··········<pre·translate="no"><span·class="attribute">-spec</span>·print_version_info(Versions)·->·<a·href="#t:void/0">void</a>()·when·Versions·::·[VersionInfo],·VersionInfo·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>3072 ··········<pre·translate="no"><span·class="attribute">-spec</span>·print_version_info(Versions)·->·<a·href="#t:void/0">void</a>()·when·Versions·::·[VersionInfo],·VersionInfo·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
3073 ······</div>3073 ······</div>
  
3074 <p>Utility·function·to·produce·a·formated·printout·of·the·versions·info·generated3074 <p>Utility·function·to·produce·a·formated·printout·of·the·versions·info·generated
3075 by·the·<code·class="inline">versions1</code>·and·<code·class="inline">versions2</code>·functions.</p><p>The·function·print_version_info/0·uses·the·result·of·function·version1/0·as3075 by·the·<code·class="inline">versions1</code>·and·<code·class="inline">versions2</code>·functions.</p><p>The·function·print_version_info/0·uses·the·result·of·function·version1/0·as
3076 <code·class="inline">VersionInfo</code>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">···········</span><span·class="p"·data-group-id="0148869195-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V</span><span·class="p"·data-group-id="0148869195-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·441,·SHA:·b2e74538088f3821f51ad50e1ab3e985289befda8065a1375216a9090ce69aa1·...·]-3">)</span><span·class="p">.</span></code></pre>3076 <code·class="inline">VersionInfo</code>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">···········</span><span·class="p"·data-group-id="1988031999-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V</span><span·class="p"·data-group-id="1988031999-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·441,·SHA:·e4489eb94875e961b056f4d48e234acd684c17d3b597c68d7cb54060d0a9a062·...·]-3">)</span><span·class="p">.</span></code></pre>
3077 ··</section>3077 ··</section>
3078 </section>3078 </section>
3079 <section·class="detail"·id="process_received_message/4">3079 <section·class="detail"·id="process_received_message/4">
  
3080 ··<div·class="detail-header">3080 ··<div·class="detail-header">
3081 ····<a·href="#process_received_message/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3081 ····<a·href="#process_received_message/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3082 ······<i·class="ri-link-m"·aria-hidden="true"></i>3082 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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3930 ······<p·class="built-using">3930 ······<p·class="built-using">
3931 ········Built·using3931 ········Built·using
3932 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3932 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3933 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3933 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3934 ······</p>3934 ······</p>
3935 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3935 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3936 ····</footer>3936 ····</footer>
3937 ··</div>3937 ··</div>
3938 </main>3938 </main>
3939 </div>3939 </div>
3940 <script>3940 <script>
3941 ··function·mermaidLoaded()·{3941 ··function·mermaidLoaded()·{
3942 ····mermaid.initialize({3942 ····mermaid.initialize({
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259 ······</p>259 ······</p>
260 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>260 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
261 ····</footer>261 ····</footer>
262 ··</div>262 ··</div>
263 </main>263 </main>
264 </div>264 </div>
265 <script>265 <script>
266 ··function·mermaidLoaded()·{266 ··function·mermaidLoaded()·{
267 ····mermaid.initialize({267 ····mermaid.initialize({
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244 ········Built·using244 ········Built·using
245 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the245 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
246 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>246 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
247 ······</p>247 ······</p>
248 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>248 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
249 ····</footer>249 ····</footer>
250 ··</div>250 ··</div>
251 </main>251 </main>
252 </div>252 </div>
253 <script>253 <script>
254 ··function·mermaidLoaded()·{254 ··function·mermaidLoaded()·{
255 ····mermaid.initialize({255 ····mermaid.initialize({
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576 ········Built·using576 ········Built·using
577 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the577 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
578 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>578 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
579 ······</p>579 ······</p>
580 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>580 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
581 ····</footer>581 ····</footer>
582 ··</div>582 ··</div>
583 </main>583 </main>
584 </div>584 </div>
585 <script>585 <script>
586 ··function·mermaidLoaded()·{586 ··function·mermaidLoaded()·{
587 ····mermaid.initialize({587 ····mermaid.initialize({
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250 ········Built·using250 ········Built·using
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252 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>252 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
253 ······</p>253 ······</p>
254 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>254 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
255 ····</footer>255 ····</footer>
256 ··</div>256 ··</div>
257 </main>257 </main>
258 </div>258 </div>
259 <script>259 <script>
260 ··function·mermaidLoaded()·{260 ··function·mermaidLoaded()·{
261 ····mermaid.initialize({261 ····mermaid.initialize({
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247 ········Built·using247 ········Built·using
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249 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>249 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
250 ······</p>250 ······</p>
251 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>251 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
252 ····</footer>252 ····</footer>
253 ··</div>253 ··</div>
254 </main>254 </main>
255 </div>255 </div>
256 <script>256 <script>
257 ··function·mermaidLoaded()·{257 ··function·mermaidLoaded()·{
258 ····mermaid.initialize({258 ····mermaid.initialize({
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168 file·(see·below·for·more·info).·The·messages·in·this·file·is·encoded·with·just168 file·(see·below·for·more·info).·The·messages·in·this·file·is·encoded·with·just
169 one·codec.·During·measurement·initiation,·the·messages·are·read·and·then169 one·codec.·During·measurement·initiation,·the·messages·are·read·and·then
170 transformed·to·all·codec·formats·used·in·the·measurement.</p><p>The·message·transformation·is·done·by·the·transformation·module.·It·is·used·to170 transformed·to·all·codec·formats·used·in·the·measurement.</p><p>The·message·transformation·is·done·by·the·transformation·module.·It·is·used·to
171 transform·a·set·of·messages·encoded·with·one·codec·into·the·other·base·codec's.</p><h4>Measurement(s)</h4><p>There·are·two·different·measurement·tools:</p><ul><li><p><em>meas</em>:</p><p>Used·to·perform·codec·measurements.·That·is,·to·see·what·kind·of·performance171 transform·a·set·of·messages·encoded·with·one·codec·into·the·other·base·codec's.</p><h4>Measurement(s)</h4><p>There·are·two·different·measurement·tools:</p><ul><li><p><em>meas</em>:</p><p>Used·to·perform·codec·measurements.·That·is,·to·see·what·kind·of·performance
172 can·be·expected·by·the·different·codecs·provided·by·the·megaco·application.</p><p>The·measurement·is·done·by·iterating·over·the·decode/encode·function·for172 can·be·expected·by·the·different·codecs·provided·by·the·megaco·application.</p><p>The·measurement·is·done·by·iterating·over·the·decode/encode·function·for
173 approx·2·seconds·per·message·and·counting·the·number·of·decodes/encodes.</p><p>Is·best·run·by·modifying·the·meas.sh.skel·skeleton·script·provided·by·the173 approx·2·seconds·per·message·and·counting·the·number·of·decodes/encodes.</p><p>Is·best·run·by·modifying·the·meas.sh.skel·skeleton·script·provided·by·the
174 tool.</p><p>To·run·it·manually·do·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="c1">%·erl·-pa·&lt;path-megaco-ebin-dir&gt;·-pa·&lt;path-to-meas-module-dir&gt;</span><span·class="w">174 tool.</p><p>To·run·it·manually·do·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="c1">%·erl·-pa·&lt;path-megaco-ebin-dir&gt;·-pa·&lt;path-to-meas-module-dir&gt;</span><span·class="w">
175 ········</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="4178257100-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="4178257100-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·156,·SHA:·d51de49f4f865d277cb37e0d0bf1fffa42b9239303723d6b1065567f1b900c03·...·]-2">]</span><span·class="w">175 ········</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="2717002825-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="2717002825-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·156,·SHA:·66c4166a016511b08dbce29309441b001103aa974d4c09f49db51f1a03ad8efb·...·]-2">]</span><span·class="w">
  
176 ········</span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V12</span><span·class="p">.</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="4178257100-3">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="4178257100-3">)</span><span·class="w">176 ········</span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V12</span><span·class="p">.</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="2717002825-3">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="2717002825-3">)</span><span·class="w">
177 ········</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">megaco_codec_meas</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4178257100-4">(</span><span·class="p"·data-group-id="4178257100-4">)</span><span·class="p">.</span><span·class="w">177 ········</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">megaco_codec_meas</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2717002825-4">(</span><span·class="p"·data-group-id="2717002825-4">)</span><span·class="p">.</span><span·class="w">
178 ········</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">178 ········</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
179 ········</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">halt</span><span·class="p"·data-group-id="4178257100-5">(</span><span·class="p"·data-group-id="4178257100-5">)</span><span·class="p">.</span></code></pre><p>or·to·make·it·even·easier,·assuming·a·measure·shall·be·done·on·all·the·codecs179 ········</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nf">halt</span><span·class="p"·data-group-id="2717002825-5">(</span><span·class="p"·data-group-id="2717002825-5">)</span><span·class="p">.</span></code></pre><p>or·to·make·it·even·easier,·assuming·a·measure·shall·be·done·on·all·the·codecs
180 (as·above):</p><pre><code·class="text">········%·erl·-noshell·-pa·&lt;path-megaco-ebin-dir&gt;·\\180 (as·above):</p><pre><code·class="text">········%·erl·-noshell·-pa·&lt;path-megaco-ebin-dir&gt;·\\
181 ··············-pa·&lt;path-to-meas-module-dir&gt;·\\181 ··············-pa·&lt;path-to-meas-module-dir&gt;·\\
182 ··············-s·megaco_codec_meas·-s·init·stop</code></pre><p>When·run·as·above·(this·will·take·some·time),·the·measurement·process·is·done182 ··············-s·megaco_codec_meas·-s·init·stop</code></pre><p>When·run·as·above·(this·will·take·some·time),·the·measurement·process·is·done
183 as·follows:</p><pre><code·class="text">For·each·codec:183 as·follows:</p><pre><code·class="text">For·each·codec:
184 ····For·each·message:184 ····For·each·message:
185 ········Read·the·message·from·the·file185 ········Read·the·message·from·the·file
186 ············Detect·message·version186 ············Detect·message·version
Offset 195, 18 lines modifiedOffset 195, 18 lines modified
195 tool.</p><p>The·<em>mstone2</em>·is·similar·to·the·<em>mstone1</em>·tool,·but·in·this·case,·each·created195 tool.</p><p>The·<em>mstone2</em>·is·similar·to·the·<em>mstone1</em>·tool,·but·in·this·case,·each·created
196 process·makes·only·<em>one</em>·run·through·the·messages·and·then·exits.·A·soon·as·a196 process·makes·only·<em>one</em>·run·through·the·messages·and·then·exits.·A·soon·as·a
197 process·exits,·a·new·process·(with·the·same·config·and·messages)·is·created·to197 process·exits,·a·new·process·(with·the·same·config·and·messages)·is·created·to
198 takes·its·place.·The·number·of·messages·processed·in·total·is·the·mstone2(1)198 takes·its·place.·The·number·of·messages·processed·in·total·is·the·mstone2(1)
199 value.</p></li></ul><p>Both·these·tools·use·the·message·package·(time_test.msgs)·provided·with·the199 value.</p></li></ul><p>Both·these·tools·use·the·message·package·(time_test.msgs)·provided·with·the
200 tool(s),·although·it·can·run·on·any·message·package·as·long·as·it·has·the·same200 tool(s),·although·it·can·run·on·any·message·package·as·long·as·it·has·the·same
201 structure.</p><h4>Message·package·file</h4><p>This·is·simply·an·erlang·compatible·text-file·with·the·following·structure:201 structure.</p><h4>Message·package·file</h4><p>This·is·simply·an·erlang·compatible·text-file·with·the·following·structure:
202 <code·class="inline">{codec_name(),·messages_list()}</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">codec_name</span><span·class="p"·data-group-id="8449746118-1">(</span><span·class="p"·data-group-id="8449746118-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">pretty</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·687,·SHA:·32d555204869f759e9978007b5f2ecd7493028bacc0b2af0765643438e9f458a·...·]-2">)</span><span·class="w">202 <code·class="inline">{codec_name(),·messages_list()}</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">codec_name</span><span·class="p"·data-group-id="1608126844-1">(</span><span·class="p"·data-group-id="1608126844-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">pretty</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·687,·SHA:·b8f2a9f4d5599bffbd0b94938276b9bcce92fcd15350db0d37fd747e6f620d7c·...·]-2">)</span><span·class="w">
203 </span><span·class="nf">messages_list</span><span·class="p"·data-group-id="8449746118-3">(</span><span·class="p"·data-group-id="8449746118-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8449746118-4">[</span><span·class="p"·data-group-id="8449746118-5">{</span><sp[·...·truncated·by·diffoscope;·len:·418,·SHA:·5f5bd278244ad05c266623aab4cc1ed016795dd4e75c5a20f0f4e465b74e2055·...·]-4">]</span><span·class="w">203 </span><span·class="nf">messages_list</span><span·class="p"·data-group-id="1608126844-3">(</span><span·class="p"·data-group-id="1608126844-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1608126844-4">[</span><span·class="p"·data-group-id="1608126844-5">{</span><sp[·...·truncated·by·diffoscope;·len:·418,·SHA:·8aa2de85026540f6e4d1d779edc29f7146b4f15aa4376f98a4da400eeff39c26·...·]-4">]</span><span·class="w">
204 </span><span·class="nf">message_name</span><span·class="p"·data-group-id="8449746118-8">(</span><span·class="p"·data-group-id="8449746118-8">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="8449746118-9">(</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·666bf0627d7f3364efba455d752eb853dbff457712d05e478739ee5e6c53aec7·...·]-9">)</span><span·class="w">204 </span><span·class="nf">message_name</span><span·class="p"·data-group-id="1608126844-8">(</span><span·class="p"·data-group-id="1608126844-8">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="1608126844-9">(</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·eb332ded4efac4ba6bc3c6ca3745fe0d416ce206b1e8ea38ccbf25595f3b6396·...·]-9">)</span><span·class="w">
205 </span><span·class="nf">message</span><span·class="p"·data-group-id="8449746118-10">(</span><span·class="p"·data-group-id="8449746118-10">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="8449746118-11">(</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·fb706a6d6d7763e2e9729432cda3d6f9e9b574a1ad6e9cca119d78bada5be6e1·...·]-11">)</span></code></pre><p>The·codec·name·is·the·name·of·the·codec·with·which·all·messages·in·the205 </span><span·class="nf">message</span><span·class="p"·data-group-id="1608126844-10">(</span><span·class="p"·data-group-id="1608126844-10">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="1608126844-11">(</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·6aaa8a3ac634157bd769a39c0b7fa156a422adef70960a7db1ac43a5269226d3·...·]-11">)</span></code></pre><p>The·codec·name·is·the·name·of·the·codec·with·which·all·messages·in·the
206 <code·class="inline">message_list()</code>·has·been·encoded.</p><p>This·file·can·be·<code·class="inline">exported</code>·to·a·file·structure·by·calling·the206 <code·class="inline">message_list()</code>·has·been·encoded.</p><p>This·file·can·be·<code·class="inline">exported</code>·to·a·file·structure·by·calling·the
207 <a·href="megaco_codec_transform.html#export_messages">export_messages</a>·function.·This·can207 <a·href="megaco_codec_transform.html#export_messages">export_messages</a>·function.·This·can
208 be·usefull·if·a·measurement·shall·be·done·with·an·external·tool.·Exporting·the208 be·usefull·if·a·measurement·shall·be·done·with·an·external·tool.·Exporting·the
209 messages·creates·a·directory·tree·with·the·following·structure:</p><pre><code·class="text">&lt;message·package&gt;/pretty/&lt;message-files&gt;209 messages·creates·a·directory·tree·with·the·following·structure:</p><pre><code·class="text">&lt;message·package&gt;/pretty/&lt;message-files&gt;
210 ··················compact/210 ··················compact/
211 ··················per/211 ··················per/
212 ··················ber/&lt;message-files&gt;212 ··················ber/&lt;message-files&gt;
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262 ······<p·class="built-using">262 ······<p·class="built-using">
263 ········Built·using263 ········Built·using
264 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the264 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
265 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>265 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
266 ······</p>266 ······</p>
267 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>267 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
268 ····</footer>268 ····</footer>
269 ··</div>269 ··</div>
270 </main>270 </main>
271 </div>271 </div>
272 <script>272 <script>
273 ··function·mermaidLoaded()·{273 ··function·mermaidLoaded()·{
274 ····mermaid.initialize({274 ····mermaid.initialize({
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488 ······<p·class="built-using">488 ······<p·class="built-using">
489 ········Built·using489 ········Built·using
490 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the490 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
491 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>491 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
492 ······</p>492 ······</p>
493 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>493 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
494 ····</footer>494 ····</footer>
495 ··</div>495 ··</div>
496 </main>496 </main>
497 </div>497 </div>
498 <script>498 <script>
499 ··function·mermaidLoaded()·{499 ··function·mermaidLoaded()·{
500 ····mermaid.initialize({500 ····mermaid.initialize({
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273 ······<p·class="built-using">273 ······<p·class="built-using">
274 ········Built·using274 ········Built·using
275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
277 ······</p>277 ······</p>
278 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>278 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
279 ····</footer>279 ····</footer>
280 ··</div>280 ··</div>
281 </main>281 </main>
282 </div>282 </div>
283 <script>283 <script>
284 ··function·mermaidLoaded()·{284 ··function·mermaidLoaded()·{
285 ····mermaid.initialize({285 ····mermaid.initialize({
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170 ···························}170 ···························}
171 ···················}171 ···················}
172 ···········}172 ···········}
173 ···}</code></pre><p>Then·the·compact·version·without·indentation·and·with·short·keywords:</p><pre><code·class="text">173 ···}</code></pre><p>Then·the·compact·version·without·indentation·and·with·short·keywords:</p><pre><code·class="text">
174 ···!/1·[124.124.124.222]174 ···!/1·[124.124.124.222]
175 ···T=9998{C=-{SC=ROOT{SV{MT=RS,AD=55555,PF=ResGW/1,RE=&quot;901·Cold·Boot&quot;}}}}</code></pre><p>And·the·programmers·view·of·the·same·message.·First·a·list·of·ActionRequest175 ···T=9998{C=-{SC=ROOT{SV{MT=RS,AD=55555,PF=ResGW/1,RE=&quot;901·Cold·Boot&quot;}}}}</code></pre><p>And·the·programmers·view·of·the·same·message.·First·a·list·of·ActionRequest
176 records·are·constructed·and·then·it·is·sent·with·one·of·the·send·functions·in176 records·are·constructed·and·then·it·is·sent·with·one·of·the·send·functions·in
177 the·API:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="n">Prof</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ServiceChangeProfile&#39;</span><span·class="p"·data-group-id="8907640343-1">{</span><span·class="ss">profileName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;resgw&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·cl[·...·truncated·by·diffoscope;·len:·130,·SHA:·98e6b835898e2d6156878950b9cd99ba755b7e45b3c19eba0bc350e43ec5e9ba·...·]-1">}</span><span·class="p">,</span><span·class="w">177 the·API:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="n">Prof</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ServiceChangeProfile&#39;</span><span·class="p"·data-group-id="5270471122-1">{</span><span·class="ss">profileName</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;resgw&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·cl[·...·truncated·by·diffoscope;·len:·130,·SHA:·bbf3014571e59fdf734a67a5f4fa229319381b83aa8afb75da1036c91f2e73e8·...·]-1">}</span><span·class="p">,</span><span·class="w">
178 ··</span><span·class="n">Parm</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ServiceChangeParm&#39;</span><span·class="p"·data-group-id="8907640343-2">{</span><span·class="ss">serviceChangeMethod</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">restart</span><span·class="p">,</span><span·class="w">178 ··</span><span·class="n">Parm</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ServiceChangeParm&#39;</span><span·class="p"·data-group-id="5270471122-2">{</span><span·class="ss">serviceChangeMethod</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">restart</span><span·class="p">,</span><span·class="w">
179 ······························</span><span·class="ss">serviceChangeAddress</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8907640343-3">{</span><span·class="ss">portNumber</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">55555</span><span·class="p"·data-group-id="8907640343-3">}</span><span·class="p">,</span><span·class="w">179 ······························</span><span·class="ss">serviceChangeAddress</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5270471122-3">{</span><span·class="ss">portNumber</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">55555</span><span·class="p"·data-group-id="5270471122-3">}</span><span·class="p">,</span><span·class="w">
180 ······························</span><span·class="ss">serviceChangeReason</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;901·Cold·Boot&quot;</span><span·class="p">,</span><span·class="w">180 ······························</span><span·class="ss">serviceChangeReason</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;901·Cold·Boot&quot;</span><span·class="p">,</span><span·class="w">
181 ······························</span><span·class="ss">serviceChangeProfile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Prof</span><span·class="p"·data-group-id="8907640343-2">}</span><span·class="p">,</span><span·class="w">181 ······························</span><span·class="ss">serviceChangeProfile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Prof</span><span·class="p"·data-group-id="5270471122-2">}</span><span·class="p">,</span><span·class="w">
182 ··</span><span·class="n">Req</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ServiceChangeRequest&#39;</span><span·class="p"·data-group-id="8907640343-4">{</span><span·class="ss">terminationID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8907640343-5">[</span><span·class="o">?</span><span·class="ss">megaco_root_termination_id</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·052982072bec2092e2755f3b0dfc75154ff31ba67bc490a19dc25641cccb04f4·...·]-5">]</span><span·class="p">,</span><span·class="w">182 ··</span><span·class="n">Req</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ServiceChangeRequest&#39;</span><span·class="p"·data-group-id="5270471122-4">{</span><span·class="ss">terminationID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5270471122-5">[</span><span·class="o">?</span><span·class="ss">megaco_root_termination_id</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·2402ed6a7b6dec9739b4abee26fd743b112d61dc61368a6c7bfcc79a94f644b1·...·]-5">]</span><span·class="p">,</span><span·class="w">
183 ································</span><span·class="ss">serviceChangeParms</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Parm</span><span·class="p"·data-group-id="8907640343-4">}</span><span·class="p">,</span><span·class="w">183 ································</span><span·class="ss">serviceChangeParms</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Parm</span><span·class="p"·data-group-id="5270471122-4">}</span><span·class="p">,</span><span·class="w">
184 ··</span><span·class="n">Actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8907640343-6">[</span><span·class="o">#</span><span·class="ss">&#39;ActionRequest&#39;</span><span·class="p"·data-group-id="8907640343-7">{</span><span·class="ss">contextId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">megaco_null_context_id</span><span·class="p">,</span><span·class="w">184 ··</span><span·class="n">Actions</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5270471122-6">[</span><span·class="o">#</span><span·class="ss">&#39;ActionRequest&#39;</span><span·class="p"·data-group-id="5270471122-7">{</span><span·class="ss">contextId</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">megaco_null_context_id</span><span·class="p">,</span><span·class="w">
185 ······························</span><span·class="ss">commandRequests</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8907640343-8">{</span><span·class="ss">serviceChangeReq</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="8907640343-8">}</span><span·class="p"·data-group-id="8907640343-7">}</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·6cf0ebe2b7f4d99772cb70f940594132391f4600557034c83553064cb41b0ebc·...·]-6">]</span><span·class="p">,</span><span·class="w">185 ······························</span><span·class="ss">commandRequests</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5270471122-8">{</span><span·class="ss">serviceChangeReq</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Req</span><span·class="p"·data-group-id="5270471122-8">}</span><span·class="p"·data-group-id="5270471122-7">}</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·09622a6cafbe90e252578a292c711e4605b6436995d4a5855521aabbfdba9906·...·]-6">]</span><span·class="p">,</span><span·class="w">
186 ··</span><span·class="nc">megaco</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="8907640343-9">(</span><span·class="n">ConnHandle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Actions</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="8907640343-9">)[·...·truncated·by·diffoscope;·len:·217,·SHA:·52d3a0105ae7a673bec23aa971270e70900e8843f6ea4fb8ef51c864eecde603·...·]-1">{</span><span·class="ss">&#39;MegacoMessage&#39;</span><span·class="p">,</span><span·class="w">186 ··</span><span·class="nc">megaco</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="5270471122-9">(</span><span·class="n">ConnHandle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Actions</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="5270471122-9">)[·...·truncated·by·diffoscope;·len:·217,·SHA:·a94f22093c2e93f7059791fd5670e9b5b4623b7764ac3dc1242ee77228112c98·...·]-1">{</span><span·class="ss">&#39;MegacoMessage&#39;</span><span·class="p">,</span><span·class="w">
187 ···</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">187 ···</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
188 ···</span><span·class="p"·data-group-id="1860424542-2">{</span><span·class="ss">&#39;Message&#39;</span><span·class="p">,</span><span·class="w">188 ···</span><span·class="p"·data-group-id="7347151874-2">{</span><span·class="ss">&#39;Message&#39;</span><span·class="p">,</span><span·class="w">
189 ····</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">189 ····</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
190 ····</span><span·class="p"·data-group-id="1860424542-3">{</span><span·class="ss">ip4Address</span><span·class="p">,</span><span·class="p"·data-group-id="1860424542-4">{</span><span·class="ss">&#39;IP4Address&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·433,·SHA:·fb720fbf0b71d19f109beae172ec311375942608b52ff1185d9f04781c5ceefe·...·]-3">}</span><span·class="p">,</span><span·class="w">190 ····</span><span·class="p"·data-group-id="7347151874-3">{</span><span·class="ss">ip4Address</span><span·class="p">,</span><span·class="p"·data-group-id="7347151874-4">{</span><span·class="ss">&#39;IP4Address&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·433,·SHA:·74f43f301827a1664abeef27ad9a02064da8ab639e78e7736c3d7141aab55e91·...·]-3">}</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="p"·data-group-id="1860424542-6">{</span><span·class="ss">transactions</span><span·class="p">,</span><span·class="w">191 ····</span><span·class="p"·data-group-id="7347151874-6">{</span><span·class="ss">transactions</span><span·class="p">,</span><span·class="w">
192 ·····</span><span·class="p"·data-group-id="1860424542-7">[</span><span·class="w">192 ·····</span><span·class="p"·data-group-id="7347151874-7">[</span><span·class="w">
193 ······</span><span·class="p"·data-group-id="1860424542-8">{</span><span·class="ss">transactionRequest</span><span·class="p">,</span><span·class="w">193 ······</span><span·class="p"·data-group-id="7347151874-8">{</span><span·class="ss">transactionRequest</span><span·class="p">,</span><span·class="w">
194 ·······</span><span·class="p"·data-group-id="1860424542-9">{</span><span·class="ss">&#39;TransactionRequest&#39;</span><span·class="p">,</span><span·class="w">194 ·······</span><span·class="p"·data-group-id="7347151874-9">{</span><span·class="ss">&#39;TransactionRequest&#39;</span><span·class="p">,</span><span·class="w">
195 ·········</span><span·class="mi">9998</span><span·class="p">,</span><span·class="w">195 ·········</span><span·class="mi">9998</span><span·class="p">,</span><span·class="w">
196 ·········</span><span·class="p"·data-group-id="1860424542-10">[</span><span·class="p"·data-group-id="1860424542-11">{</span><span·class="ss">&#39;ActionRequest&#39;</span><span·class="p">,</span><span·class="w">196 ·········</span><span·class="p"·data-group-id="7347151874-10">[</span><span·class="p"·data-group-id="7347151874-11">{</span><span·class="ss">&#39;ActionRequest&#39;</span><span·class="p">,</span><span·class="w">
197 ···········</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">197 ···········</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
198 ···········</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">198 ···········</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
199 ···········</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">199 ···········</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
200 ···········</span><span·class="p"·data-group-id="1860424542-12">[</span><span·class="w">200 ···········</span><span·class="p"·data-group-id="7347151874-12">[</span><span·class="w">
201 ············</span><span·class="p"·data-group-id="1860424542-13">{</span><span·class="ss">&#39;CommandRequest&#39;</span><span·class="p">,</span><span·class="w">201 ············</span><span·class="p"·data-group-id="7347151874-13">{</span><span·class="ss">&#39;CommandRequest&#39;</span><span·class="p">,</span><span·class="w">
202 ·············</span><span·class="p"·data-group-id="1860424542-14">{</span><span·class="ss">serviceChangeReq</span><span·class="p">,</span><span·class="w">202 ·············</span><span·class="p"·data-group-id="7347151874-14">{</span><span·class="ss">serviceChangeReq</span><span·class="p">,</span><span·class="w">
203 ··············</span><span·class="p"·data-group-id="1860424542-15">{</span><span·class="ss">&#39;ServiceChangeRequest&#39;</span><span·class="p">,</span><span·class="w">203 ··············</span><span·class="p"·data-group-id="7347151874-15">{</span><span·class="ss">&#39;ServiceChangeRequest&#39;</span><span·class="p">,</span><span·class="w">
204 ···············</span><span·class="p"·data-group-id="1860424542-16">[</span><span·class="w">204 ···············</span><span·class="p"·data-group-id="7347151874-16">[</span><span·class="w">
205 ················</span><span·class="p"·data-group-id="1860424542-17">{</span><span·class="ss">megaco_term_id</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1860424542-18">[</span><span·class="s">[·...·truncated·by·diffoscope;·len:·172,·SHA:·dd7c0575187ff4369187f65eed74e8b35344e4079e2d15b8e212947b42ce0385·...·]-16">]</span><span·class="p">,</span><span·class="w">205 ················</span><span·class="p"·data-group-id="7347151874-17">{</span><span·class="ss">megaco_term_id</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7347151874-18">[</span><span·class="s">[·...·truncated·by·diffoscope;·len:·172,·SHA:·9701c24f66435e0d579c082b7135e37360fdb186419d3ec0222efc7758543a57·...·]-16">]</span><span·class="p">,</span><span·class="w">
206 ················</span><span·class="p"·data-group-id="1860424542-19">{</span><span·class="ss">&#39;ServiceChangeParm&#39;</span><span·class="p">,</span><span·class="w">206 ················</span><span·class="p"·data-group-id="7347151874-19">{</span><span·class="ss">&#39;ServiceChangeParm&#39;</span><span·class="p">,</span><span·class="w">
207 ·················</span><span·class="ss">restart</span><span·class="p">,</span><span·class="w">207 ·················</span><span·class="ss">restart</span><span·class="p">,</span><span·class="w">
208 ·················</span><span·class="p"·data-group-id="1860424542-20">{</span><span·class="ss">portNumber</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">55555</span><span·class="p"·data-group-id="1860424542-20">}</span><span·class="p">,</span><span·class="w">208 ·················</span><span·class="p"·data-group-id="7347151874-20">{</span><span·class="ss">portNumber</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">55555</span><span·class="p"·data-group-id="7347151874-20">}</span><span·class="p">,</span><span·class="w">
209 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">209 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
210 ·················</span><span·class="p"·data-group-id="1860424542-21">{</span><span·class="ss">&#39;ServiceChangeProfile&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;resgw&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·class=[·...·truncated·by·diffoscope;·len:·126,·SHA:·2cfbbc392d8eac56a373b296e02972c9371ef86d598e081d18e3155182799918·...·]-21">}</span><span·class="p">,</span><span·class="w">210 ·················</span><span·class="p"·data-group-id="7347151874-21">{</span><span·class="ss">&#39;ServiceChangeProfile&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;resgw&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·class=[·...·truncated·by·diffoscope;·len:·126,·SHA:·0c579c814ce5733af0fedc908c2cb3899aa0d93830cfbcbac60d2fc717fa44b4·...·]-21">}</span><span·class="p">,</span><span·class="w">
211 ·················</span><span·class="s">&quot;901·MG·Cold·Boot&quot;</span><span·class="p">,</span><span·class="w">211 ·················</span><span·class="s">&quot;901·MG·Cold·Boot&quot;</span><span·class="p">,</span><span·class="w">
212 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">212 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
213 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">213 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
214 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="w">214 ·················</span><span·class="ss">asn1_NOVALUE</span><span·class="w">
215 ················</span><span·class="p"·data-group-id="1860424542-19">}</span><span·class="w">215 ················</span><span·class="p"·data-group-id="7347151874-19">}</span><span·class="w">
216 ··············</span><span·class="p"·data-group-id="1860424542-15">}</span><span·class="w">216 ··············</span><span·class="p"·data-group-id="7347151874-15">}</span><span·class="w">
217 ·············</span><span·class="p"·data-group-id="1860424542-14">}</span><span·class="p">,</span><span·class="w">217 ·············</span><span·class="p"·data-group-id="7347151874-14">}</span><span·class="p">,</span><span·class="w">
218 ·············</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">218 ·············</span><span·class="ss">asn1_NOVALUE</span><span·class="p">,</span><span·class="w">
219 ·············</span><span·class="ss">asn1_NOVALUE</span><span·class="w">219 ·············</span><span·class="ss">asn1_NOVALUE</span><span·class="w">
220 ············</span><span·class="p"·data-group-id="1860424542-13">}</span><span·class="w">220 ············</span><span·class="p"·data-group-id="7347151874-13">}</span><span·class="w">
221 ···········</span><span·class="p"·data-group-id="1860424542-12">]</span><span·class="w">221 ···········</span><span·class="p"·data-group-id="7347151874-12">]</span><span·class="w">
222 ··········</span><span·class="p"·data-group-id="1860424542-11">}</span><span·class="w">222 ··········</span><span·class="p"·data-group-id="7347151874-11">}</span><span·class="w">
223 ·········</span><span·class="p"·data-group-id="1860424542-10">]</span><span·class="w">223 ·········</span><span·class="p"·data-group-id="7347151874-10">]</span><span·class="w">
224 ·······</span><span·class="p"·data-group-id="1860424542-9">}</span><span·class="w">224 ·······</span><span·class="p"·data-group-id="7347151874-9">}</span><span·class="w">
225 ······</span><span·class="p"·data-group-id="1860424542-8">}</span><span·class="w">225 ······</span><span·class="p"·data-group-id="7347151874-8">}</span><span·class="w">
226 ·····</span><span·class="p"·data-group-id="1860424542-7">]</span><span·class="w">226 ·····</span><span·class="p"·data-group-id="7347151874-7">]</span><span·class="w">
227 ····</span><span·class="p"·data-group-id="1860424542-6">}</span><span·class="w">227 ····</span><span·class="p"·data-group-id="7347151874-6">}</span><span·class="w">
228 ···</span><span·class="p"·data-group-id="1860424542-2">}</span><span·class="w">228 ···</span><span·class="p"·data-group-id="7347151874-2">}</span><span·class="w">
229 ··</span><span·class="p"·data-group-id="1860424542-1">}</span></code></pre><p>The·following·encoding·modules·are·provided:</p><ul><li>megaco_pretty_text_encoder·-·encodes·messages·into·pretty·text·format,·decodes229 ··</span><span·class="p"·data-group-id="7347151874-1">}</span></code></pre><p>The·following·encoding·modules·are·provided:</p><ul><li>megaco_pretty_text_encoder·-·encodes·messages·into·pretty·text·format,·decodes
230 both·pretty·as·well·as·compact·text.</li><li>megaco_compact_text_encoder·-·encodes·messages·into·compact·text·format,230 both·pretty·as·well·as·compact·text.</li><li>megaco_compact_text_encoder·-·encodes·messages·into·compact·text·format,
231 decodes·both·pretty·as·well·as·compact·text.</li><li>megaco_binary_encoder·-·encode/decode·ASN.1·BER·messages.·This·encoder231 decodes·both·pretty·as·well·as·compact·text.</li><li>megaco_binary_encoder·-·encode/decode·ASN.1·BER·messages.·This·encoder
232 implements·the·fastest·of·the·BER·encoders/decoders.·Recommended·binary·codec.</li><li>megaco_ber_encoder·-·encode/decode·ASN.1·BER·messages.</li><li>megaco_per_encoder·-·encode/decode·ASN.1·PER·messages.·N.B.·that·this·format232 implements·the·fastest·of·the·BER·encoders/decoders.·Recommended·binary·codec.</li><li>megaco_ber_encoder·-·encode/decode·ASN.1·BER·messages.</li><li>megaco_per_encoder·-·encode/decode·ASN.1·PER·messages.·N.B.·that·this·format
233 is·not·included·in·the·Megaco·standard.</li><li>megaco_erl_dist_encoder·-·encodes·messages·into·Erlangs·distribution·format.233 is·not·included·in·the·Megaco·standard.</li><li>megaco_erl_dist_encoder·-·encodes·messages·into·Erlangs·distribution·format.
234 It·is·rather·verbose·but·encoding·and·decoding·is·blinding·fast.·N.B.·that234 It·is·rather·verbose·but·encoding·and·decoding·is·blinding·fast.·N.B.·that
235 this·format·is·not·included·in·the·Megaco·standard.</li></ul><p><a·href=""·id="erl_dist_config"></a></p><h2·id="configuration-of-erlang-distribution-encoding-module"·class="section-heading">235 this·format·is·not·included·in·the·Megaco·standard.</li></ul><p><a·href=""·id="erl_dist_config"></a></p><h2·id="configuration-of-erlang-distribution-encoding-module"·class="section-heading">
236 ··<a·href="#configuration-of-erlang-distribution-encoding-module"·class="hover-link">236 ··<a·href="#configuration-of-erlang-distribution-encoding-module"·class="hover-link">
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357 ······</p>357 ······</p>
358 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>358 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
359 ····</footer>359 ····</footer>
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155 synchronously·for·a·reply.</p><p>After·this·initial·service·change·message·the·connection·between·the·MG·and·MGC155 synchronously·for·a·reply.</p><p>After·this·initial·service·change·message·the·connection·between·the·MG·and·MGC
156 is·fully·established·and·supervised.</p><p>Assuming·that·the·MGC·is·started·on·the·local·host,·four·different·MG's,·using156 is·fully·established·and·supervised.</p><p>Assuming·that·the·MGC·is·started·on·the·local·host,·four·different·MG's,·using
157 text·over·TCP/IP,·binary·over·TCP/IP,·text·over·UDP/IP·and·binary·over·UDP/IP157 text·over·TCP/IP,·binary·over·TCP/IP,·text·over·UDP/IP·and·binary·over·UDP/IP
158 may·be·started·on·the·same·Erlang·node·with:</p><pre><code·class="text">······cd·megaco/examples/simple158 may·be·started·on·the·same·Erlang·node·with:</p><pre><code·class="text">······cd·megaco/examples/simple
159 ······erl·-pa·../../../megaco/ebin·-s·megaco_filter·-s·megaco159 ······erl·-pa·../../../megaco/ebin·-s·megaco_filter·-s·megaco
160 ······megaco_simple_mg:start().</code></pre><p>or·simply·'gmake·mg'.</p><p>If·you·&quot;only&quot;·want·to·start·a·single·MG·which·tries·to·connect·an·MG·on·a·host160 ······megaco_simple_mg:start().</code></pre><p>or·simply·'gmake·mg'.</p><p>If·you·&quot;only&quot;·want·to·start·a·single·MG·which·tries·to·connect·an·MG·on·a·host
161 named·&quot;baidarka&quot;,·you·may·use·one·of·these·functions·(instead·of·the161 named·&quot;baidarka&quot;,·you·may·use·one·of·these·functions·(instead·of·the
162 megaco_simple_mg:start/0·above):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_tcp_text</span><span·class="p"·data-group-id="5322194457-1">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5322194457-2">[</span><span·class="p"·data-group-id="5322194457-2">]</span><span·class="p"·data-group-id="532219[·...·truncated·by·diffoscope;·len:·4,·SHA:·3d19e945ed5a25a399da3036bc862275296544218de8260d47a5ad3d9b853af4·...·]-1">)</span><span·class="p">.</span><span·class="w">162 megaco_simple_mg:start/0·above):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_tcp_text</span><span·class="p"·data-group-id="1854301219-1">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1854301219-2">[</span><span·class="p"·data-group-id="1854301219-2">]</span><span·class="p"·data-group-id="185430[·...·truncated·by·diffoscope;·len:·4,·SHA:·53f4041ba0cc8ed13c5a119242af44e60105ea5e486e4e8e3153e770c09261bb·...·]-1">)</span><span·class="p">.</span><span·class="w">
163 ······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_tcp_binary</span><span·class="p"·data-group-id="5322194457-3">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5322194457-4">[</span><span·class="p"·data-group-id="5322194457-4">]</span><span·class="p"·data-group-id="532219[·...·truncated·by·diffoscope;·len:·4,·SHA:·3d19e945ed5a25a399da3036bc862275296544218de8260d47a5ad3d9b853af4·...·]-3">)</span><span·class="p">.</span><span·class="w">163 ······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_tcp_binary</span><span·class="p"·data-group-id="1854301219-3">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1854301219-4">[</span><span·class="p"·data-group-id="1854301219-4">]</span><span·class="p"·data-group-id="185430[·...·truncated·by·diffoscope;·len:·4,·SHA:·53f4041ba0cc8ed13c5a119242af44e60105ea5e486e4e8e3153e770c09261bb·...·]-3">)</span><span·class="p">.</span><span·class="w">
164 ······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_udp_text</span><span·class="p"·data-group-id="5322194457-5">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5322194457-6">[</span><span·class="p"·data-group-id="5322194457-6">]</span><span·class="p"·data-group-id="532219[·...·truncated·by·diffoscope;·len:·4,·SHA:·3d19e945ed5a25a399da3036bc862275296544218de8260d47a5ad3d9b853af4·...·]-5">)</span><span·class="p">.</span><span·class="w">164 ······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_udp_text</span><span·class="p"·data-group-id="1854301219-5">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1854301219-6">[</span><span·class="p"·data-group-id="1854301219-6">]</span><span·class="p"·data-group-id="185430[·...·truncated·by·diffoscope;·len:·4,·SHA:·53f4041ba0cc8ed13c5a119242af44e60105ea5e486e4e8e3153e770c09261bb·...·]-5">)</span><span·class="p">.</span><span·class="w">
165 ······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_udp_binary</span><span·class="p"·data-group-id="5322194457-7">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5322194457-8">[</span><span·class="p"·data-group-id="5322194457-8">]</span><span·class="p"·data-group-id="532219[·...·truncated·by·diffoscope;·len:·4,·SHA:·3d19e945ed5a25a399da3036bc862275296544218de8260d47a5ad3d9b853af4·...·]-7">)</span><span·class="p">.</span></code></pre><p>The·-s·megaco_filter·option·to·erl·implies,·the·event·tracing·mechanism·to·be165 ······</span><span·class="nc">megaco_simple_mg</span><span·class="p">:</span><span·class="nf">start_udp_binary</span><span·class="p"·data-group-id="1854301219-7">(</span><span·class="s">&quot;baidarka&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1854301219-8">[</span><span·class="p"·data-group-id="1854301219-8">]</span><span·class="p"·data-group-id="185430[·...·truncated·by·diffoscope;·len:·4,·SHA:·53f4041ba0cc8ed13c5a119242af44e60105ea5e486e4e8e3153e770c09261bb·...·]-7">)</span><span·class="p">.</span></code></pre><p>The·-s·megaco_filter·option·to·erl·implies,·the·event·tracing·mechanism·to·be
166 enabled·and·an·interactive·sequence·chart·tool·to·be·started.·This·may·be·quite166 enabled·and·an·interactive·sequence·chart·tool·to·be·started.·This·may·be·quite
167 useful·in·order·to·visualize·how·your·MG·interacts·with·the·Megaco/H.248167 useful·in·order·to·visualize·how·your·MG·interacts·with·the·Megaco/H.248
168 protocol·stack.</p><p>The·event·traces·may·alternatively·be·directed·to·a·file·for·later·analyze.·By168 protocol·stack.</p><p>The·event·traces·may·alternatively·be·directed·to·a·file·for·later·analyze.·By
169 default·the·event·tracing·is·disabled,·but·it·may·dynamically·be·enabled·without169 default·the·event·tracing·is·disabled,·but·it·may·dynamically·be·enabled·without
170 any·need·for·re-compilation·of·the·code.</p>170 any·need·for·re-compilation·of·the·code.</p>
171 </div>171 </div>
  
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219 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>219 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
220 ····</footer>220 ····</footer>
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222 </main>222 </main>
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440 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>440 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
441 ····</footer>441 ····</footer>
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443 </main>443 </main>
444 </div>444 </div>
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216 ····</footer>216 ····</footer>
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218 </main>218 </main>
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262 </div>262 </div>
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127 ··</h1>127 ··</h1>
  
  
128 ····<section·id="moduledoc">128 ····<section·id="moduledoc">
129 <p>Callback·module·for·users·of·the·Megaco·application</p><p>This·module·defines·the·callback·behaviour·of·Megaco·users.·A·megaco_user129 <p>Callback·module·for·users·of·the·Megaco·application</p><p>This·module·defines·the·callback·behaviour·of·Megaco·users.·A·megaco_user
130 compliant·callback·module·must·export·the·following·functions:</p><ul><li><a·href="#c:handle_connect/3">handle_connect/2,3</a></li><li><a·href="#c:handle_disconnect/3">handle_disconnect/3</a></li><li><a·href="#c:handle_syntax_error/4">handle_syntax_error/3,4</a></li><li><a·href="#c:handle_message_error/4">handle_message_error/3,4</a></li><li><a·href="#c:handle_trans_request/4">handle_trans_request/3,4</a></li><li><a·href="#c:handle_trans_long_request/4">handle_trans_long_request/3,4</a></li><li><a·href="#c:handle_trans_reply/5">handle_trans_reply/4,5</a></li><li><a·href="#c:handle_trans_ack/5">handle_trans_ack/4,5</a></li><li><a·href="#c:handle_unexpected_trans/4">handle_unexpected_trans/3,4</a></li><li><a·href="#c:handle_trans_request_abort/5">handle_trans_request_abort/4,5</a></li><li><a·href="#c:handle_segment_reply/6">handle_segment_reply/5,6</a></li></ul><p>The·semantics·of·them·and·their·exact·signatures·are·explained·below.</p><p>The·<code·class="inline">user_args</code>·configuration·parameter·which·may·be·used·to·extend·the·argument130 compliant·callback·module·must·export·the·following·functions:</p><ul><li><a·href="#c:handle_connect/3">handle_connect/2,3</a></li><li><a·href="#c:handle_disconnect/3">handle_disconnect/3</a></li><li><a·href="#c:handle_syntax_error/4">handle_syntax_error/3,4</a></li><li><a·href="#c:handle_message_error/4">handle_message_error/3,4</a></li><li><a·href="#c:handle_trans_request/4">handle_trans_request/3,4</a></li><li><a·href="#c:handle_trans_long_request/4">handle_trans_long_request/3,4</a></li><li><a·href="#c:handle_trans_reply/5">handle_trans_reply/4,5</a></li><li><a·href="#c:handle_trans_ack/5">handle_trans_ack/4,5</a></li><li><a·href="#c:handle_unexpected_trans/4">handle_unexpected_trans/3,4</a></li><li><a·href="#c:handle_trans_request_abort/5">handle_trans_request_abort/4,5</a></li><li><a·href="#c:handle_segment_reply/6">handle_segment_reply/5,6</a></li></ul><p>The·semantics·of·them·and·their·exact·signatures·are·explained·below.</p><p>The·<code·class="inline">user_args</code>·configuration·parameter·which·may·be·used·to·extend·the·argument
131 list·of·the·callback·functions.·For·example,·the·handle_connect·function·takes131 list·of·the·callback·functions.·For·example,·the·handle_connect·function·takes
132 by·default·two·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_connect</span><span·class="p"·data-group-id="2973690425-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version</span><span·class="p"·data-group-id="2973690425-1">)</span></code></pre><p>but·if·the·<code·class="inline">user_args</code>·parameter·is·set·to·a·longer·list,·such·as132 by·default·two·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_connect</span><span·class="p"·data-group-id="4272652766-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version</span><span·class="p"·data-group-id="4272652766-1">)</span></code></pre><p>but·if·the·<code·class="inline">user_args</code>·parameter·is·set·to·a·longer·list,·such·as
133 <code·class="inline">[SomePid,SomeTableRef]</code>,·the·callback·function·is·expected·to·have·these·(in133 <code·class="inline">[SomePid,SomeTableRef]</code>,·the·callback·function·is·expected·to·have·these·(in
134 this·case·two)·extra·arguments·last·in·the·argument·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_connect</span><span·class="p"·data-group-id="9932320130-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SomePid</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·75,·SHA:·1ff6c66d4be4d31441d1ccc4e1d93a48c6f42bff9cfc20107ff978d56c220699·...·]-1">)</span></code></pre><p><a·href=""·id="extra_argument"></a></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Must·of·the·functions·below·has·an·optional·<code·class="inline">Extra</code>·argument·(e.g.134 this·case·two)·extra·arguments·last·in·the·argument·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">handle_connect</span><span·class="p"·data-group-id="4540235355-1">(</span><span·class="n">Handle</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SomePid</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·75,·SHA:·4eb864cb8fd5d35e0530209001ab579591ddbf6f50c4563a63400648cdad21b1·...·]-1">)</span></code></pre><p><a·href=""·id="extra_argument"></a></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Must·of·the·functions·below·has·an·optional·<code·class="inline">Extra</code>·argument·(e.g.
135 <a·href="#c:handle_unexpected_trans/4">handle_unexpected_trans/4</a>).·The·functions135 <a·href="#c:handle_unexpected_trans/4">handle_unexpected_trans/4</a>).·The·functions
136 which·takes·this·argument·will·be·called·if·and·only·if·one·of·the·functions136 which·takes·this·argument·will·be·called·if·and·only·if·one·of·the·functions
137 <a·href="megaco.html#receive_message/5"><code·class="inline">receive_message/5</code></a>·or137 <a·href="megaco.html#receive_message/5"><code·class="inline">receive_message/5</code></a>·or
138 <a·href="megaco.html#process_received_message/5"><code·class="inline">process_received_message/5</code></a>·was·called138 <a·href="megaco.html#process_received_message/5"><code·class="inline">process_received_message/5</code></a>·was·called
139 with·the·<code·class="inline">Extra</code>·argument·different·than·<code·class="inline">ignore_extra</code>.</p></section><h2·id="module-data-types"·class="section-heading">139 with·the·<code·class="inline">Extra</code>·argument·different·than·<code·class="inline">ignore_extra</code>.</p></section><h2·id="module-data-types"·class="section-heading">
140 ··<a·href="#module-data-types"·class="hover-link">140 ··<a·href="#module-data-types"·class="hover-link">
141 ····<i·class="ri-link-m"·aria-hidden="true"></i>141 ····<i·class="ri-link-m"·aria-hidden="true"></i>
142 ··</a>142 ··</a>
143 ··<span·class="text">DATA·TYPES</span>143 ··<span·class="text">DATA·TYPES</span>
144 </h2>144 </h2>
145 <pre><code·class="makeup·erlang"·translate="no"><span·class="nf">action_request</span><span·class="p"·data-group-id="2790094610-1">(</span><span·class="p"·data-group-id="2790094610-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ActionRequest&#39;</span><span·class="p"·data-group-id="2790094[·...·truncated·by·diffoscope;·len:·56,·SHA:·2d812810ed7abf9d0c0a7b9b1a979daf4dd9db8884653b75be80255e1c5a0351·...·]-2">}</span><span·class="w">145 <pre><code·class="makeup·erlang"·translate="no"><span·class="nf">action_request</span><span·class="p"·data-group-id="3250136974-1">(</span><span·class="p"·data-group-id="3250136974-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ActionRequest&#39;</span><span·class="p"·data-group-id="3250136[·...·truncated·by·diffoscope;·len:·56,·SHA:·c2a0fc3af188b4d3ba752562cc6e6c3aac5c20526717e69e0df2c925c19d5783·...·]-2">}</span><span·class="w">
146 </span><span·class="nf">action_reply</span><span·class="p"·data-group-id="2790094610-3">(</span><span·class="p"·data-group-id="2790094610-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ActionReply&#39;</span><span·class="p"·data-group-id="279009461[·...·truncated·by·diffoscope;·len:·54,·SHA:·3c0d3a4ae406ef6f74ae66718df7773c86cd1ddd81d3cdef610264126e0ec902·...·]-4">}</span><span·class="w">146 </span><span·class="nf">action_reply</span><span·class="p"·data-group-id="3250136974-3">(</span><span·class="p"·data-group-id="3250136974-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ActionReply&#39;</span><span·class="p"·data-group-id="325013697[·...·truncated·by·diffoscope;·len:·54,·SHA:·55bda33bf8385a1159d406f5abd1d7d4071073b183fa827d93462bf7138219e0·...·]-4">}</span><span·class="w">
147 </span><span·class="nf">error_desc</span><span·class="p"·data-group-id="2790094610-5">(</span><span·class="p"·data-group-id="2790094610-5">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ErrorDescriptor&#39;</span><span·class="p"·data-group-id="2790094610-6">{</span><span·class="p"·data-group-id="2790094610-6">}</span><span·class="w"> 
148 </span><span·class="nf">segment_no</span><span·class="p"·data-group-id="2790094610-7">(</span><span·class="p"·data-group-id="2790094610-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·654,·SHA:·0fe8f277fb9ab0931ae3df50033e08ab1e00d0b9c075106da907dc947a2f9994·...·]147 </span><span·class="nf">error_desc</span><span·class="p"·data-group-id="3250136974-5">(</span><span·class="p"·data-group-id="3250136974-5">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;ErrorDescriptor[·...·truncated·by·diffoscope;·len:·134,·SHA:·33843f10ee48c4ad4f1d6d96ca0154fcf9e3f1471d7890bbcb783daff317df14·...·]
 148 </span><span·class="nf">segment_no</span><span·class="p"·data-group-id="3250136974-7">(</span><span·class="p"·data-group-id="3250136974-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="3250136974-8">(</span><span·class="p"·data-group-id="3250136974-8">)</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">conn_handle</span><span·class="p"·data-group-id="9374491414-1">(</span><span·class="p"·data-group-id="9374491414-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">megaco_conn_handle</span><span·class="p"·data-group-id="9374491414-2">{</span><span·class="p"·data-group-id="9374491414-2">}</span></code></pre><p>The·record·initially·returned·by·<code·class="inline">megaco:connect/4,5</code>.·It·identifies·a·&quot;virtual&quot;
149 connection·and·may·be·reused·after·a·reconnect·(disconnect·+·connect).</p><pre><code·class="text">protocol_version()·=·integer()</code></pre><p>Is·the·actual·protocol·version.·In·most·cases·the·protocol·version·is·retrieved149 connection·and·may·be·reused·after·a·reconnect·(disconnect·+·connect).</p><pre><code·class="text">protocol_version()·=·integer()</code></pre><p>Is·the·actual·protocol·version.·In·most·cases·the·protocol·version·is·retrieved
150 from·the·processed·message,·but·there·are·exceptions:</p><ul><li>When·<code·class="inline">handle_connect/2,3</code>·is·triggered·by·an·explicit·call·to150 from·the·processed·message,·but·there·are·exceptions:</p><ul><li>When·<code·class="inline">handle_connect/2,3</code>·is·triggered·by·an·explicit·call·to
151 <code·class="inline">megaco:connect/4,5</code>.</li><li><a·href="#c:handle_disconnect/3"><code·class="inline">handle_disconnect/3</code></a></li><li><a·href="#c:handle_syntax_error/3"><code·class="inline">handle_syntax_error/3</code></a></li></ul><p>In·these·cases,·the·ProtocolVersion·default·version·is·obtained·from·the·static151 <code·class="inline">megaco:connect/4,5</code>.</li><li><a·href="#c:handle_disconnect/3"><code·class="inline">handle_disconnect/3</code></a></li><li><a·href="#c:handle_syntax_error/3"><code·class="inline">handle_syntax_error/3</code></a></li></ul><p>In·these·cases,·the·ProtocolVersion·default·version·is·obtained·from·the·static
152 connection·configuration:</p><ul><li><code·class="inline">megaco:conn_info(ConnHandle,·protocol_version)</code>.</li></ul>152 connection·configuration:</p><ul><li><code·class="inline">megaco:conn_info(ConnHandle,·protocol_version)</code>.</li></ul>
153 ····</section>153 ····</section>
  
154 </div>154 </div>
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162 <code·class="inline">true</code>,·a·majority·of·the·table·replicas·must·be·available·for·an·update·to162 <code·class="inline">true</code>,·a·majority·of·the·table·replicas·must·be·available·for·an·update·to
163 succeed.·Majority·checking·can·be·enabled·on·tables·with·mission-critical163 succeed.·Majority·checking·can·be·enabled·on·tables·with·mission-critical
164 data,·where·it·is·vital·to·avoid·inconsistencies·because·of·network·splits.</p></li><li><p><code·class="inline">snmp</code>.·Each·(set-based)·Mnesia·table·can·be·automatically·turned·into·a164 data,·where·it·is·vital·to·avoid·inconsistencies·because·of·network·splits.</p></li><li><p><code·class="inline">snmp</code>.·Each·(set-based)·Mnesia·table·can·be·automatically·turned·into·a
165 Simple·Network·Management·Protocol·(SNMP)·ordered·table·as·well.·This·property165 Simple·Network·Management·Protocol·(SNMP)·ordered·table·as·well.·This·property
166 specifies·the·types·of·the·SNMP·keys.</p></li><li><p><code·class="inline">attributes</code>.·The·names·of·the·attributes·for·the·records·that·are·inserted·in166 specifies·the·types·of·the·SNMP·keys.</p></li><li><p><code·class="inline">attributes</code>.·The·names·of·the·attributes·for·the·records·that·are·inserted·in
167 the·table.</p></li></ul><p>For·information·about·the·complete·set·of·table·properties·and·their·details,167 the·table.</p></li></ul><p>For·information·about·the·complete·set·of·table·properties·and·their·details,
168 see·<a·href="#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>.</p><p>This·Reference·Manual·uses·a·table·of·persons·to·illustrate·various·examples.168 see·<a·href="#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>.</p><p>This·Reference·Manual·uses·a·table·of·persons·to·illustrate·various·examples.
169 The·following·record·definition·is·assumed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="3365429948-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3365429948-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">169 The·following·record·definition·is·assumed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="2574759536-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2574759536-2">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">
170 ·················</span><span·class="ss">age</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">170 ·················</span><span·class="ss">age</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
171 ·················</span><span·class="ss">address</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">unknown</span><span·class="p">,</span><span·class="w">171 ·················</span><span·class="ss">address</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">unknown</span><span·class="p">,</span><span·class="w">
172 ·················</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">172 ·················</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
173 ·················</span><span·class="ss">children</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3365429948-3">[</span><span·class="p"·data-group-id="3365429948-3">]</span><span·class="p"·data-group-id="3365429948-2">}</span><span·class="p"·data-group-id="3365429948-1">)</span><span·class="p">,</span></code></pre><p>The·first·record·attribute·is·the·primary·key,·or·key·for·short.</p><p>The·function·descriptions·are·sorted·in·alphabetical·order.·It·is·recommended·to173 ·················</span><span·class="ss">children</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2574759536-3">[</span><span·class="p"·data-group-id="2574759536-3">]</span><span·class="p"·data-group-id="2574759536-2">}</span><span·class="p"·data-group-id="2574759536-1">)</span><span·class="p">,</span></code></pre><p>The·first·record·attribute·is·the·primary·key,·or·key·for·short.</p><p>The·function·descriptions·are·sorted·in·alphabetical·order.·It·is·recommended·to
174 start·to·read·about·<a·href="#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>,·<a·href="#lock/2"><code·class="inline">mnesia:lock/2</code></a>,·and174 start·to·read·about·<a·href="#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>,·<a·href="#lock/2"><code·class="inline">mnesia:lock/2</code></a>,·and
175 ·<a·href="#activity/4"><code·class="inline">mnesia:activity/4</code></a>·before·you·continue·and·learn·about·the·rest.</p><p>Writing·or·deleting·in·transaction-context·creates·a·local·copy·of·each·modified175 ·<a·href="#activity/4"><code·class="inline">mnesia:activity/4</code></a>·before·you·continue·and·learn·about·the·rest.</p><p>Writing·or·deleting·in·transaction-context·creates·a·local·copy·of·each·modified
176 record·during·the·transaction.·During·iteration,·that·is,·<a·href="#foldl/4"><code·class="inline">mnesia:foldl/4</code></a>,176 record·during·the·transaction.·During·iteration,·that·is,·<a·href="#foldl/4"><code·class="inline">mnesia:foldl/4</code></a>,
177 <a·href="#foldr/4"><code·class="inline">mnesia:foldr/4</code></a>,·<a·href="#next/2"><code·class="inline">mnesia:next/2</code></a>,·<a·href="#prev/2"><code·class="inline">mnesia:prev/2</code></a>,·and·<a·href="#snmp_get_next_index/2"><code·class="inline">mnesia:snmp_get_next_index/2</code></a>,·Mnesia177 <a·href="#foldr/4"><code·class="inline">mnesia:foldr/4</code></a>,·<a·href="#next/2"><code·class="inline">mnesia:next/2</code></a>,·<a·href="#prev/2"><code·class="inline">mnesia:prev/2</code></a>,·and·<a·href="#snmp_get_next_index/2"><code·class="inline">mnesia:snmp_get_next_index/2</code></a>,·Mnesia
178 compensates·for·every·written·or·deleted·record,·which·can·reduce·the178 compensates·for·every·written·or·deleted·record,·which·can·reduce·the
179 performance.</p><p>If·possible,·avoid·writing·or·deleting·records·in·the·same·transaction·before179 performance.</p><p>If·possible,·avoid·writing·or·deleting·records·in·the·same·transaction·before
180 iterating·over·the·table.</p><h2·id="module-configuration-parameters"·class="section-heading">180 iterating·over·the·table.</p><h2·id="module-configuration-parameters"·class="section-heading">
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2793 ······<div·class="specs">2793 ······<div·class="specs">
  
2794 ··········<pre·translate="no"><span·class="attribute">-spec</span>·change_table_copy_type(Tab·::·<a·href="#t:table/0">table</a>(),·Node·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:node/0">node</a>(),·To·::·<a·href="#t:storage_type/0">storage_type</a>())·->·<a·href="#t:t_result/1">t_result</a>(ok).</pre>2794 ··········<pre·translate="no"><span·class="attribute">-spec</span>·change_table_copy_type(Tab·::·<a·href="#t:table/0">table</a>(),·Node·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:node/0">node</a>(),·To·::·<a·href="#t:storage_type/0">storage_type</a>())·->·<a·href="#t:t_result/1">t_result</a>(ok).</pre>
  
2795 ······</div>2795 ······</div>
  
2796 <p>Change·the·storage·type·of·a·table.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_copy_type</span><span·class="p"·data-group-id="1534372436-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="1534372436-2">(</span><span·class="p"·data-group-id="1534372436-2">)</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·102,·SHA:·7adbf606c94347870266d30090bb3ce2a3841824c0a80795cd07e00e3bbd0ec0·...·]-1">)</span></code></pre><p>Transforms·the·<code·class="inline">person</code>·table·from·a·RAM·table·into·a·disc-based·table·at2796 <p>Change·the·storage·type·of·a·table.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_copy_type</span><span·class="p"·data-group-id="7549184995-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="7549184995-2">(</span><span·class="p"·data-group-id="7549184995-2">)</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·102,·SHA:·3db7e067c6916e180e1d586e6f2692d7b19a049982292c9b20cdd75e7bdf31b7·...·]-1">)</span></code></pre><p>Transforms·the·<code·class="inline">person</code>·table·from·a·RAM·table·into·a·disc-based·table·at
2797 <code·class="inline">Node</code>.</p><p>This·function·can·also·be·used·to·change·the·storage·type·of·the·table·named2797 <code·class="inline">Node</code>.</p><p>This·function·can·also·be·used·to·change·the·storage·type·of·the·table·named
2798 <code·class="inline">schema</code>.·The·schema·table·can·only·have·<code·class="inline">ram_copies</code>·or·<code·class="inline">disc_copies</code>·as·the2798 <code·class="inline">schema</code>.·The·schema·table·can·only·have·<code·class="inline">ram_copies</code>·or·<code·class="inline">disc_copies</code>·as·the
2799 storage·type.·If·the·storage·type·of·the·schema·is·<code·class="inline">ram_copies</code>,·no·other·table2799 storage·type.·If·the·storage·type·of·the·schema·is·<code·class="inline">ram_copies</code>,·no·other·table
2800 can·be·disc-resident·on·that·node.</p>2800 can·be·disc-resident·on·that·node.</p>
2801 ··</section>2801 ··</section>
2802 </section>2802 </section>
2803 <section·class="detail"·id="change_table_frag/2">2803 <section·class="detail"·id="change_table_frag/2">
Offset 3032, 30 lines modifiedOffset 3032, 30 lines modified
3032 Therefore·applications·that·use·SNMP·to·manipulate·and·control·the·system·can3032 Therefore·applications·that·use·SNMP·to·manipulate·and·control·the·system·can
3033 be·designed·easily,·since·Mnesia·provides·a·direct·mapping·between·the·logical3033 be·designed·easily,·since·Mnesia·provides·a·direct·mapping·between·the·logical
3034 tables·that·make·up·an·SNMP·control·application·and·the·physical·data·that3034 tables·that·make·up·an·SNMP·control·application·and·the·physical·data·that
3035 makes·up·a·Mnesia·table.</p></li><li><p><code·class="inline">{storage_properties,·[{Backend,·Properties}]</code>·forwards·more·properties·to·the3035 makes·up·a·Mnesia·table.</p></li><li><p><code·class="inline">{storage_properties,·[{Backend,·Properties}]</code>·forwards·more·properties·to·the
3036 back·end·storage.·<code·class="inline">Backend</code>·can·currently·be·<code·class="inline">ets</code>·or·<code·class="inline">dets</code>.·<code·class="inline">Properties</code>·is3036 back·end·storage.·<code·class="inline">Backend</code>·can·currently·be·<code·class="inline">ets</code>·or·<code·class="inline">dets</code>.·<code·class="inline">Properties</code>·is
3037 a·list·of·options·sent·to·the·back·end·storage·during·table·creation.3037 a·list·of·options·sent·to·the·back·end·storage·during·table·creation.
3038 <code·class="inline">Properties</code>·cannot·contain·properties·already·used·by·Mnesia,·such·as·<code·class="inline">type</code>3038 <code·class="inline">Properties</code>·cannot·contain·properties·already·used·by·Mnesia,·such·as·<code·class="inline">type</code>
3039 or·<code·class="inline">named_table</code>.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7790041531-1">(</span><span·class="ss">table</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7790041531-2">[</span><span·class="p"·data-group-id="7790041531-3">{</span><span·class="ss">ram_copies</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·689,·SHA:·bbf9d48c0adee835818a37cf0439802a2c42c7647e11b4757df66e8d39459bff·...·]-6">}</span><span·class="p">,</span><span·class="w">3039 or·<code·class="inline">named_table</code>.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="4925870724-1">(</span><span·class="ss">table</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4925870724-2">[</span><span·class="p"·data-group-id="4925870724-3">{</span><span·class="ss">ram_copies</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·689,·SHA:·c64dfb5607e49e5dbbc97582373c6918aed389ee91085be60b7d145b49bcd98d·...·]-6">}</span><span·class="p">,</span><span·class="w">
3040 ·······</span><span·class="p"·data-group-id="7790041531-8">{</span><span·class="ss">storage_properties</span><span·class="p">,</span><span·class="w">3040 ·······</span><span·class="p"·data-group-id="4925870724-8">{</span><span·class="ss">storage_properties</span><span·class="p">,</span><span·class="w">
3041 ········</span><span·class="p"·data-group-id="7790041531-9">[</span><span·class="p"·data-group-id="7790041531-10">{</span><span·class="ss">ets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7790041531-11">[</span><span·class="ss">compressed</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·872,·SHA:·48be4d0c69d7093d36609a6a33dbec2d9e6a83df155bbefe511f369859b433db·...·]-1">)</span></code></pre></li><li><p><code·class="inline">{type,·Type}</code>,·where·<code·class="inline">Type</code>·must·be·either·of·the·atoms·<code·class="inline">set</code>,·<code·class="inline">ordered_set</code>,3041 ········</span><span·class="p"·data-group-id="4925870724-9">[</span><span·class="p"·data-group-id="4925870724-10">{</span><span·class="ss">ets</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4925870724-11">[</span><span·class="ss">compressed</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·872,·SHA:·7f6c05349d7f66eb283b8482a694a5f6b57720898ba9552539c8a28ed1a0467b·...·]-1">)</span></code></pre></li><li><p><code·class="inline">{type,·Type}</code>,·where·<code·class="inline">Type</code>·must·be·either·of·the·atoms·<code·class="inline">set</code>,·<code·class="inline">ordered_set</code>,
3042 or·<code·class="inline">bag</code>.·Default·is·<code·class="inline">set</code>.·In·a·<code·class="inline">set</code>,·all·records·have·unique·keys.·In·a3042 or·<code·class="inline">bag</code>.·Default·is·<code·class="inline">set</code>.·In·a·<code·class="inline">set</code>,·all·records·have·unique·keys.·In·a
3043 <code·class="inline">bag</code>,·several·records·can·have·the·same·key,·but·the·record·content·is3043 <code·class="inline">bag</code>,·several·records·can·have·the·same·key,·but·the·record·content·is
3044 unique.·If·a·non-unique·record·is·stored,·the·old·conflicting·records·are3044 unique.·If·a·non-unique·record·is·stored,·the·old·conflicting·records·are
3045 overwritten.</p><p>Notice·that·currently·<code·class="inline">ordered_set</code>·is·not·supported·for·<code·class="inline">disc_only_copies</code>.</p></li><li><p><code·class="inline">{local_content,·Bool}</code>,·where·<code·class="inline">Bool</code>·is·<code·class="inline">true</code>·or·<code·class="inline">false</code>.·Default·is3045 overwritten.</p><p>Notice·that·currently·<code·class="inline">ordered_set</code>·is·not·supported·for·<code·class="inline">disc_only_copies</code>.</p></li><li><p><code·class="inline">{local_content,·Bool}</code>,·where·<code·class="inline">Bool</code>·is·<code·class="inline">true</code>·or·<code·class="inline">false</code>.·Default·is
3046 <code·class="inline">false</code>.</p></li></ul><p>For·example,·the·following·call·creates·the·<code·class="inline">person</code>·table·(defined·earlier)·and3046 <code·class="inline">false</code>.</p></li></ul><p>For·example,·the·following·call·creates·the·<code·class="inline">person</code>·table·(defined·earlier)·and
3047 replicates·it·on·two·nodes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="5551458501-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">3047 replicates·it·on·two·nodes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1618586818-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">
3048 ····</span><span·class="p"·data-group-id="5551458501-2">[</span><span·class="p"·data-group-id="5551458501-3">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5551458501-4">[</span><span·class="n">N1</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·146,·SHA:·79d4b5e1d7f63b5065ce4ca9042da174fff6902fb39da6a125b3dfb40daf9600·...·]-3">}</span><span·class="p">,</span><span·class="w">3048 ····</span><span·class="p"·data-group-id="1618586818-2">[</span><span·class="p"·data-group-id="1618586818-3">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1618586818-4">[</span><span·class="n">N1</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·146,·SHA:·e6d26204e3f341cddb76f8afcc01df54a72cafa8167e63564d8ec2302ca73596·...·]-3">}</span><span·class="p">,</span><span·class="w">
3049 ·····</span><span·class="p"·data-group-id="5551458501-5">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="5551458501-6">(</span><span·class="ss">fields</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·244,·SHA:·c5e51f24d79935610c044cd726369949306ad1f50afa238ae5d1de01525ec0f9·...·]-1">)</span><span·class="p">.</span></code></pre><p>If·it·is·required·that·Mnesia·must·build·and·maintain·an·extra·index·table·on3049 ·····</span><span·class="p"·data-group-id="1618586818-5">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="1618586818-6">(</span><span·class="ss">fields</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·244,·SHA:·953f1db889d7bbdb85f87cf8ed552ecedeb92e525ab5cd3355e94a140f6425bb·...·]-1">)</span><span·class="p">.</span></code></pre><p>If·it·is·required·that·Mnesia·must·build·and·maintain·an·extra·index·table·on
3050 attribute·<code·class="inline">address</code>·of·all·the·<code·class="inline">person</code>·records·that·are·inserted·in·the·table,3050 attribute·<code·class="inline">address</code>·of·all·the·<code·class="inline">person</code>·records·that·are·inserted·in·the·table,
3051 the·following·code·would·be·issued:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3481057702-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">3051 the·following·code·would·be·issued:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="5586936945-1">(</span><span·class="ss">person</span><span·class="p">,</span><span·class="w">
3052 ····</span><span·class="p"·data-group-id="3481057702-2">[</span><span·class="p"·data-group-id="3481057702-3">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3481057702-4">[</span><span·class="n">N1</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·146,·SHA:·60bbdfd0adbcb3552bb437f93222900797ef2d8e391e950aef3f89f2d33144cf·...·]-3">}</span><span·class="p">,</span><span·class="w">3052 ····</span><span·class="p"·data-group-id="5586936945-2">[</span><span·class="p"·data-group-id="5586936945-3">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5586936945-4">[</span><span·class="n">N1</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·146,·SHA:·ddae672cd4c0faa341092e702a0f817e2459cc9ed7efe483ac67f0e1dd391ce7·...·]-3">}</span><span·class="p">,</span><span·class="w">
3053 ·····</span><span·class="p"·data-group-id="3481057702-5">{</span><span·class="ss">index</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3481057702-6">[</span><span·class="ss">address</span><span·class="p"·data-group-id="3481057702-6">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·6366d72cc6c51845bb22250dbcfece9a2f4597451072f8f40ded89c9d5ad0dd3·...·]-5">}</span><span·class="p">,</span><span·class="w">3053 ·····</span><span·class="p"·data-group-id="5586936945-5">{</span><span·class="ss">index</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5586936945-6">[</span><span·class="ss">address</span><span·class="p"·data-group-id="5586936945-6">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·c9ca483a4ac9cfd6a6a802cacef8a3b0672ef69ff9626eba6bb67c8682b5a779·...·]-5">}</span><span·class="p">,</span><span·class="w">
3054 ·····</span><span·class="p"·data-group-id="3481057702-7">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3481057702-8">(</span><span·class="ss">fields</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·244,·SHA:·4242433778a720519bd81ab0131cd31236d52e4d5624197cff35cfa3b89ed0dc·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·specification·of·<code·class="inline">index</code>·and·<code·class="inline">attributes</code>·can·be·hard-coded·as3054 ·····</span><span·class="p"·data-group-id="5586936945-7">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="5586936945-8">(</span><span·class="ss">fields</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·244,·SHA:·f0cedaee5e050cfd717b4078dd430ab885621cc78d926a3b9519e3421a305186·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·specification·of·<code·class="inline">index</code>·and·<code·class="inline">attributes</code>·can·be·hard-coded·as
3055 <code·class="inline">{index,·[2]}</code>·and·<code·class="inline">{attributes,·[name,·age,·address,·salary,·children]}</code>,3055 <code·class="inline">{index,·[2]}</code>·and·<code·class="inline">{attributes,·[name,·age,·address,·salary,·children]}</code>,
3056 respectively.</p><p><a·href="#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>·writes·records·into·the·table·<code·class="inline">schema</code>.·This·function,3056 respectively.</p><p><a·href="#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>·writes·records·into·the·table·<code·class="inline">schema</code>.·This·function,
3057 and·all·other·schema·manipulation·functions,·are·implemented·with·the·normal3057 and·all·other·schema·manipulation·functions,·are·implemented·with·the·normal
3058 transaction·management·system.·This·guarantees·that·schema·updates·are·performed3058 transaction·management·system.·This·guarantees·that·schema·updates·are·performed
3059 on·all·nodes·in·an·atomic·manner.</p>3059 on·all·nodes·in·an·atomic·manner.</p>
3060 ··</section>3060 ··</section>
3061 </section>3061 </section>
Offset 5155, 18 lines modifiedOffset 5155, 18 lines modified
5155 ······</div>5155 ······</div>
  
5156 <p>Select·the·objects·in·<code·class="inline">Tab</code>·against·<code·class="inline">MatchSpec</code>.</p><p>Matches·the·objects·in·table·<code·class="inline">Tab</code>·using·a·<code·class="inline">match_spec</code>·as·described·in·the5156 <p>Select·the·objects·in·<code·class="inline">Tab</code>·against·<code·class="inline">MatchSpec</code>.</p><p>Matches·the·objects·in·table·<code·class="inline">Tab</code>·using·a·<code·class="inline">match_spec</code>·as·described·in·the
5157 <a·href="../../../../lib/stdlib-6.2.2/doc/html/ets.html#select/3"><code·class="inline">ets:select/3</code></a>.·Optionally·a·lock·<code·class="inline">read</code>·or·<code·class="inline">write</code>·can·be·given·as·the·third5157 <a·href="../../../../lib/stdlib-6.2.2/doc/html/ets.html#select/3"><code·class="inline">ets:select/3</code></a>.·Optionally·a·lock·<code·class="inline">read</code>·or·<code·class="inline">write</code>·can·be·given·as·the·third
5158 argument.·Default·is·<code·class="inline">read</code>.·The·return·value·depends·on·<code·class="inline">MatchSpec</code>.</p><p>Notice·that·for·best·performance,·<code·class="inline">select</code>·is·to·be·used·before·any·modifying5158 argument.·Default·is·<code·class="inline">read</code>.·The·return·value·depends·on·<code·class="inline">MatchSpec</code>.</p><p>Notice·that·for·best·performance,·<code·class="inline">select</code>·is·to·be·used·before·any·modifying
5159 operations·are·done·on·that·table·in·the·same·transaction.·That·is,·do·not·use5159 operations·are·done·on·that·table·in·the·same·transaction.·That·is,·do·not·use
5160 <code·class="inline">write</code>·or·<code·class="inline">delete</code>·before·a·<code·class="inline">select</code>.</p><p>In·its·simplest·forms,·the·<code·class="inline">match_spec</code>·look·as·follows:</p><ul><li><code·class="inline">MatchSpec·=·[MatchFunction]</code></li><li><code·class="inline">MatchFunction·=·{MatchHead,·[Guard],·[Result]}</code></li><li><p><code·class="inline">MatchHead·=·tuple()·|·record()</code></p></li><li><code·class="inline">Guard·=·{&quot;Guardtest·name&quot;,·...}</code></li><li><code·class="inline">Result·=·&quot;Term·construct&quot;</code></li></ul><p>For·a·complete·description·of·<code·class="inline">select</code>,·see·the·<a·href="../../../../erts-15.2.6/doc/html/index.html">ERTS</a>5160 <code·class="inline">write</code>·or·<code·class="inline">delete</code>·before·a·<code·class="inline">select</code>.</p><p>In·its·simplest·forms,·the·<code·class="inline">match_spec</code>·look·as·follows:</p><ul><li><code·class="inline">MatchSpec·=·[MatchFunction]</code></li><li><code·class="inline">MatchFunction·=·{MatchHead,·[Guard],·[Result]}</code></li><li><p><code·class="inline">MatchHead·=·tuple()·|·record()</code></p></li><li><code·class="inline">Guard·=·{&quot;Guardtest·name&quot;,·...}</code></li><li><code·class="inline">Result·=·&quot;Term·construct&quot;</code></li></ul><p>For·a·complete·description·of·<code·class="inline">select</code>,·see·the·<a·href="../../../../erts-15.2.6/doc/html/index.html">ERTS</a>
5161 User's·Guide·and·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/ets.html"><code·class="inline">ets</code></a>·manual·page·in·STDLIB.</p><p>For·example,·to·find·the·names·of·all·male·persons·older·than·30·in·table·<code·class="inline">Tab</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">MatchHead</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="9110221998-1">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sex</span><span·class="o">=</span><span·class="ss">male</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·287,·SHA:·c0d9635145b1937af5dae711d89e985e336b29e3a63b2befcb960ef674fbd866·...·]8-1">}</span><span·class="p">,</span><span·class="w">5161 User's·Guide·and·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/ets.html"><code·class="inline">ets</code></a>·manual·page·in·STDLIB.</p><p>For·example,·to·find·the·names·of·all·male·persons·older·than·30·in·table·<code·class="inline">Tab</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">MatchHead</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="5301464858-1">{</span><span·class="ss">name</span><span·class="o">=</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sex</span><span·class="o">=</span><span·class="ss">male</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·287,·SHA:·0049cf96936da9ecc3828787ad3e7505100c623f9e37eeb97b09569c8b2b6c82·...·]8-1">}</span><span·class="p">,</span><span·class="w">
5162 </span><span·class="n">Guard</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9110221998-2">{</span><span·class="ss">&#39;&gt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">30</span><span·class="p"·data-group-id="9110221[·...·truncated·by·diffoscope;·len:·2,·SHA:·8c1f1046219ddd216a023f792356ddf127fce372a72ec9b4cdac989ee5b0b455·...·]8-2">}</span><span·class="p">,</span><span·class="w">5162 </span><span·class="n">Guard</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5301464858-2">{</span><span·class="ss">&#39;&gt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">30</span><span·class="p"·data-group-id="5301464[·...·truncated·by·diffoscope;·len:·2,·SHA:·b4944c6ff08dc6f43da2e9c824669b7d927dd1fa976fadc7b456881f51bf5ccc·...·]8-2">}</span><span·class="p">,</span><span·class="w">
5163 </span><span·class="n">Result</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">5163 </span><span·class="n">Result</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">
5164 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="9110221998-3">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="p"·data-group-id="9110221998-4">[</span><span·class="p"·data-group-id="9110221998-5">{</span><span·class="n">MatchHead</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·465,·SHA:·807612cdc622f3d5d40469247e19b02d6aded56fe0793fb554faf4765562265f·...·]8-3">)</span><span·class="p">,</span></code></pre>5164 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="5301464858-3">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="p"·data-group-id="5301464858-4">[</span><span·class="p"·data-group-id="5301464858-5">{</span><span·class="n">MatchHead</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·465,·SHA:·3ed0b0b4e16f8f856cbc3681c23e484d01686e679ce9af586b186bd3613c8de2·...·]8-3">)</span><span·class="p">,</span></code></pre>
5165 ··</section>5165 ··</section>
5166 </section>5166 </section>
5167 <section·class="detail"·id="select/4">5167 <section·class="detail"·id="select/4">
  
5168 ··<div·class="detail-header">5168 ··<div·class="detail-header">
5169 ····<a·href="#select/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">5169 ····<a·href="#select/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
5170 ······<i·class="ri-link-m"·aria-hidden="true"></i>5170 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 5435, 17 lines modifiedOffset 5435, 17 lines modified
5435 information·needed·is·information·about·the·key·types·in·the·table.·Multiple5435 information·needed·is·information·about·the·key·types·in·the·table.·Multiple
5436 keys·cannot·be·handled·in·Mnesia,·but·many·SNMP·tables·have·multiple·keys.5436 keys·cannot·be·handled·in·Mnesia,·but·many·SNMP·tables·have·multiple·keys.
5437 Therefore,·the·following·convention·is·used:·if·a·table·has·multiple·keys,·these5437 Therefore,·the·following·convention·is·used:·if·a·table·has·multiple·keys,·these
5438 must·always·be·stored·as·a·tuple·of·the·keys.·Information·about·the·key·types·is5438 must·always·be·stored·as·a·tuple·of·the·keys.·Information·about·the·key·types·is
5439 specified·as·a·tuple·of·atoms·describing·the·types.·The·only·significant·type·is5439 specified·as·a·tuple·of·atoms·describing·the·types.·The·only·significant·type·is
5440 <code·class="inline">fix_string</code>.·This·means·that·a·string·has·a·fixed·size.</p><p>For·example,·the·following·causes·table·<code·class="inline">person</code>·to·be·ordered·as·an·SNMP·table:</p><pre><code·class="text">mnesia:snmp_open_table(person,·[{key,·string}])</code></pre><p>Consider·the·following·schema·for·a·table·of·company·employees.·Each·employee·is5440 <code·class="inline">fix_string</code>.·This·means·that·a·string·has·a·fixed·size.</p><p>For·example,·the·following·causes·table·<code·class="inline">person</code>·to·be·ordered·as·an·SNMP·table:</p><pre><code·class="text">mnesia:snmp_open_table(person,·[{key,·string}])</code></pre><p>Consider·the·following·schema·for·a·table·of·company·employees.·Each·employee·is
5441 identified·by·department·number·and·name.·The·other·table·column·stores·the5441 identified·by·department·number·and·name.·The·other·table·column·stores·the
5442 telephone·number:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2948655578-1">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">5442 telephone·number:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="8714213263-1">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">
5443 ····</span><span·class="p"·data-group-id="2948655578-2">[</span><span·class="p"·data-group-id="2948655578-3">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2948655578-4">[</span><span·class="p"·data-group-id="2948655578-5">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2948655578-6">{</span><span·class="ss">integer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">string</span><span·class="p"·data-group-id="2948655578-6">}</span><span·class="p"·data-group-id="2948655578-5">}</span><span·class="p"·data-group-id="2948655578-4">]</span><span·class="p"·data-group-id="2948655578-3">}</span><span·class="p">,</span><span·class="w"> 
5444 ·····</span><span·class="p"·data-group-id="2948655578-7">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2948655578-8">(</span><span·class="ss">fields</[·...·truncated·by·diffoscope;·len:·470,·SHA:·f916c3d5ecb9aa20d24b6a2bf854ab491d140e9549f8e47d08c8a8cb974f28cb·...·]5443 ····</span><span·class="p"·data-group-id="8714213263-2">[</span><span·class="p"·data-group-id="8714213263-3">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8714213263-4">[</span><span·class="p[·...·truncated·by·diffoscope;·len:·528,·SHA:·332ee00b9a73c9c80b8a732fe95fa53b62f66d9c146ecf5d8f6176f741eb63cf·...·]
 5444 ·····</span><span·class="p"·data-group-id="8714213263-7">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="8714213263-8">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">employees</span><span·class="p"·data-group-id="8714213263-8">)</span><span·class="p"·data-group-id="8714213263-7">}</span><span·class="p"·data-group-id="8714213263-2">]</span><span·class="p"·data-group-id="8714213263-1">)</span><span·class="p">,</span></code></pre><p>The·corresponding·SNMP·table·would·have·three·columns:·<code·class="inline">department</code>,·<code·class="inline">name</code>,·and
5445 <code·class="inline">telno</code>.</p><p>An·option·is·to·have·table·columns·that·are·not·visible·through·the·SNMP5445 <code·class="inline">telno</code>.</p><p>An·option·is·to·have·table·columns·that·are·not·visible·through·the·SNMP
5446 protocol.·These·columns·must·be·the·last·columns·of·the·table.·In·the·previous5446 protocol.·These·columns·must·be·the·last·columns·of·the·table.·In·the·previous
5447 example,·the·SNMP·table·could·have·columns·<code·class="inline">department</code>·and·<code·class="inline">name</code>·only.·The5447 example,·the·SNMP·table·could·have·columns·<code·class="inline">department</code>·and·<code·class="inline">name</code>·only.·The
5448 application·could·then·use·column·<code·class="inline">telno</code>·internally,·but·it·would·not·be5448 application·could·then·use·column·<code·class="inline">telno</code>·internally,·but·it·would·not·be
5449 visible·to·the·SNMP·managers.</p><p>In·a·table·monitored·by·SNMP,·all·elements·must·be·integers,·strings,·or·lists5449 visible·to·the·SNMP·managers.</p><p>In·a·table·monitored·by·SNMP,·all·elements·must·be·integers,·strings,·or·lists
5450 of·integers.</p><p>When·a·table·is·SNMP·ordered,·modifications·are·more·expensive·than·usual,5450 of·integers.</p><p>When·a·table·is·SNMP·ordered,·modifications·are·more·expensive·than·usual,
5451 O(logN).·Also,·more·memory·is·used.</p><p>Notice·that·only·the·lexicographical·SNMP·ordering·is·implemented·in·Mnesia,·not5451 O(logN).·Also,·more·memory·is·used.</p><p>Notice·that·only·the·lexicographical·SNMP·ordering·is·implemented·in·Mnesia,·not
Offset 6008, 43 lines modifiedOffset 6008, 43 lines modified
  
6008 <p>Execute·<code·class="inline">Fun</code>·with·arguments·<code·class="inline">Args</code>·as·a·transaction.</p><p>The·code·that·executes·inside·the·transaction·can·consist·of·a·series·of·table6008 <p>Execute·<code·class="inline">Fun</code>·with·arguments·<code·class="inline">Args</code>·as·a·transaction.</p><p>The·code·that·executes·inside·the·transaction·can·consist·of·a·series·of·table
6009 manipulation·functions.·If·something·goes·wrong·inside·the·transaction·as·a6009 manipulation·functions.·If·something·goes·wrong·inside·the·transaction·as·a
6010 result·of·a·user·error·or·a·certain·table·not·being·available,·the·entire6010 result·of·a·user·error·or·a·certain·table·not·being·available,·the·entire
6011 transaction·is·terminated·and·the·function·<a·href="#transaction/1"><code·class="inline">transaction/1</code></a>6011 transaction·is·terminated·and·the·function·<a·href="#transaction/1"><code·class="inline">transaction/1</code></a>
6012 returns·the·tuple·<code·class="inline">{aborted,·Reason}</code>.</p><p>If·all·is·going·well,·<code·class="inline">{atomic,·ResultOfFun}</code>·is·returned,·where·<code·class="inline">ResultOfFun</code>6012 returns·the·tuple·<code·class="inline">{aborted,·Reason}</code>.</p><p>If·all·is·going·well,·<code·class="inline">{atomic,·ResultOfFun}</code>·is·returned,·where·<code·class="inline">ResultOfFun</code>
6013 is·the·value·of·the·last·expression·in·<code·class="inline">Fun</code>.</p><p>A·function·that·adds·a·family·to·the·database·can·be·written·as·follows·if·there6013 is·the·value·of·the·last·expression·in·<code·class="inline">Fun</code>.</p><p>A·function·that·adds·a·family·to·the·database·can·be·written·as·follows·if·there
6014 is·a·structure·<code·class="inline">{family,·Father,·Mother,·ChildrenList}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">add_family</span><span·class="p"·data-group-id="6287168395-1">(</span><span·class="p"·data-group-id="6287168395-2">{</span><span·class="ss">family</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·c[·...·truncated·by·diffoscope;·len:·166,·SHA:·417ab92d08404500e5839182d298a8e28648df54da8b4573c913b95debd74237·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">6014 is·a·structure·<code·class="inline">{family,·Father,·Mother,·ChildrenList}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">add_family</span><span·class="p"·data-group-id="8865802847-1">(</span><span·class="p"·data-group-id="8865802847-2">{</span><span·class="ss">family</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·c[·...·truncated·by·diffoscope;·len:·166,·SHA:·46014a47cc78ef3cd558f2d983caab050d3a2336d6179d8bb0e255a35b298b53·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
6015 ····</span><span·class="n">ChildOids</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="6287168395-3">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">oid</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Children</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·19398f5a8974968887947f27ca5af6f2d3ad45b461522739a81b0fbdc61e6349·...·]-3">)</span><span·class="p">,</span><span·class="w">6015 ····</span><span·class="n">ChildOids</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="8865802847-3">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">oid</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Children</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·21d330cc0b892a750fab5bb7cc2d8cc87914bbec6625ff6bcbc778f522887c19·...·]-3">)</span><span·class="p">,</span><span·class="w">
6016 ····</span><span·class="n">Trans</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="6287168395-4">(</span><span·class="p"·data-group-id="6287168395-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">6016 ····</span><span·class="n">Trans</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8865802847-4">(</span><span·class="p"·data-group-id="8865802847-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
6017 ········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="6287168395-5">(</span><span·class="n">F</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6287168395-6">{</span><span·class="ss">children</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">ChildOids</span><span·class="p"·data-group-id="6287168395-6">}</span><span·class="p"·data-group-id="6287168395-5">)</span><span·class="p">,</span><span·class="w"> 
6018 ········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="6287168395-7">(</span><span·class="n">M</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="6287168395-8">{</span><span·class="ss">children</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·129,·SHA:·5134da938b40d0dda978631f05cd7e587ce9b6f002b486cbfde6f1cb4c0f1dc7·...·]">)</span><span·class="p">,</span><span·class="w">6017 ········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="8865802847-5">(</span><span·class="n">F</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8865802847-6">{</span><span·class="ss">children</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·129,·SHA:·9b7eacdc8c186f47fcd708abbfa11bf7f8b1089f19e76475fe3eec5c3cb0ea0f·...·]">)</span><span·class="p">,</span><span·class="w">
 6018 ········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="8865802847-7">(</span><span·class="n">M</span><span·class="o">#</span><span·class="ss">person</span><span·class="p"·data-group-id="8865802847-8">{</span><span·class="ss">children</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">ChildOids</span><span·class="p"·data-group-id="8865802847-8">}</span><span·class="p"·data-group-id="8865802847-7">)</span><span·class="p">,</span><span·class="w">
6019 ········</span><span·class="n">Write</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="6287168395-9">(</span><span·class="n">Child</span><span·class="p"·data-group-id="6287168395-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write<[·...·truncated·by·diffoscope;·len:·129,·SHA:·0a73cd4e52926ab4f5ef9283e5937540f8f469d0e4baab2d630bc9c01e844a71·...·]-10">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">6019 ········</span><span·class="n">Write</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8865802847-9">(</span><span·class="n">Child</span><span·class="p"·data-group-id="8865802847-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write<[·...·truncated·by·diffoscope;·len:·129,·SHA:·d14f8e034d46e6ef144e7ccf3f01b948aac2180c2323ea277416024f7b1db52b·...·]-10">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
6020 ········</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foreach</span><span·class="p"·data-group-id="6287168395-11">(</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Children</span><span·class="p"·data-group-id="6287168395-11">)</span><span·class="w">6020 ········</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foreach</span><span·class="p"·data-group-id="8865802847-11">(</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Children</span><span·class="p"·data-group-id="8865802847-11">)</span><span·class="w">
6021 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">6021 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
6022 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="6287168395-12">(</span><span·class="n">Trans</span><span·class="p"·data-group-id="6287168395-12">)</span><span·class="p">.</span><span·class="w">6022 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="8865802847-12">(</span><span·class="n">Trans</span><span·class="p"·data-group-id="8865802847-12">)</span><span·class="p">.</span><span·class="w">
  
6023 </span><span·class="nf">oid</span><span·class="p"·data-group-id="6287168395-13">(</span><span·class="n">Rec</span><span·class="p"·data-group-id="6287168395-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6287168395-14">{</span><span·class="nf">elemen[·...·truncated·by·diffoscope;·len:·542,·SHA:·95339a52a927632e0c00b22bd806e77741bab67a167299324040b35c893b782d·...·]-14">}</span><span·class="p">.</span></code></pre><p>This·code·adds·a·set·of·people·to·the·database.·Running·this·code·within·one6023 </span><span·class="nf">oid</span><span·class="p"·data-group-id="8865802847-13">(</span><span·class="n">Rec</span><span·class="p"·data-group-id="8865802847-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8865802847-14">{</span><span·class="nf">elemen[·...·truncated·by·diffoscope;·len:·542,·SHA:·51bcbfdbeeed5acfe52a2f7a23779928a03ac9c9e505b64adc184997d0a4ecd6·...·]-14">}</span><span·class="p">.</span></code></pre><p>This·code·adds·a·set·of·people·to·the·database.·Running·this·code·within·one
6024 transaction·ensures·that·either·the·whole·family·is·added·to·the·database,·or6024 transaction·ensures·that·either·the·whole·family·is·added·to·the·database,·or
6025 the·whole·transaction·terminates.·For·example,·if·the·last·child·is·badly6025 the·whole·transaction·terminates.·For·example,·if·the·last·child·is·badly
6026 formatted,·or·the·executing·process·terminates·because·of·an·<code·class="inline">'EXIT'</code>·signal6026 formatted,·or·the·executing·process·terminates·because·of·an·<code·class="inline">'EXIT'</code>·signal
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155 </span><span·class="c1">%%</span><span·class="w">155 </span><span·class="c1">%%</span><span·class="w">
156 </span><span·class="c1">%%·The·NewOpaqueData·arguments·returned·by·restore·callback·functions·will</span><span·class="w">156 </span><span·class="c1">%%·The·NewOpaqueData·arguments·returned·by·restore·callback·functions·will</span><span·class="w">
157 </span><span·class="c1">%%·be·given·as·input·when·the·next·restore·callback·function·is·invoked</span><span·class="w">157 </span><span·class="c1">%%·be·given·as·input·when·the·next·restore·callback·function·is·invoked</span><span·class="w">
158 </span><span·class="c1">%%·If·any·return·value·does·not·match·{ok,·_}·the·restore·will·be·aborted.</span><span·class="w">158 </span><span·class="c1">%%·If·any·return·value·does·not·match·{ok,·_}·the·restore·will·be·aborted.</span><span·class="w">
159 </span><span·class="c1">%%</span><span·class="w">159 </span><span·class="c1">%%</span><span·class="w">
160 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">160 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
161 </span><span·class="w">161 </span><span·class="w">
162 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5231963611-1">(</span><span·class="ss">mnesia_backup</span><span·class="p"·data-group-id="5231963611-1">)</span><span·class="p">.</span><span·class="w">162 </span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4014355553-1">(</span><span·class="ss">mnesia_backup</span><span·class="p"·data-group-id="4014355553-1">)</span><span·class="p">.</span><span·class="w">
163 </span><span·class="w">163 </span><span·class="w">
164 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="5231963611-2">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="5231963611-2">)</span><span·class="p">.</span><span·class="w">164 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="4014355553-2">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="4014355553-2">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="w">165 </span><span·class="w">
166 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5231963611-3">(</span><span·class="p"·data-group-id="5231963611-4">[</span><span·class="w">166 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4014355553-3">(</span><span·class="p"·data-group-id="4014355553-4">[</span><span·class="w">
167 ·········</span><span·class="c1">%%·Write·access</span><span·class="w">167 ·········</span><span·class="c1">%%·Write·access</span><span·class="w">
168 ·········</span><span·class="ss">open_write</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">168 ·········</span><span·class="ss">open_write</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
169 ·········</span><span·class="ss">write</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">169 ·········</span><span·class="ss">write</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
170 ·········</span><span·class="ss">commit_write</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">170 ·········</span><span·class="ss">commit_write</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
171 ·········</span><span·class="ss">abort_write</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">171 ·········</span><span·class="ss">abort_write</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
  
172 ·········</span><span·class="c1">%%·Read·access</span><span·class="w">172 ·········</span><span·class="c1">%%·Read·access</span><span·class="w">
173 ·········</span><span·class="ss">open_read</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">173 ·········</span><span·class="ss">open_read</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
174 ·········</span><span·class="ss">read</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">174 ·········</span><span·class="ss">read</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
175 ·········</span><span·class="ss">close_read</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">175 ·········</span><span·class="ss">close_read</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">
176 ········</span><span·class="p"·data-group-id="5231963611-4">]</span><span·class="p"·data-group-id="5231963611-3">)</span><span·class="p">.</span><span·class="w">176 ········</span><span·class="p"·data-group-id="4014355553-4">]</span><span·class="p"·data-group-id="4014355553-3">)</span><span·class="p">.</span><span·class="w">
  
177 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">177 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
178 </span><span·class="c1">%%·Backup·callback·interface</span><span·class="w">178 </span><span·class="c1">%%·Backup·callback·interface</span><span·class="w">
179 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5231963611-5">(</span><span·class="ss">backup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5231963611-6">{</span><span·class="ss">tmp_file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file</[·...·truncated·by·diffoscope;·len:·180,·SHA:·df842f1f742fd92d0a08b7cfe0943e993d633873a33f54cbe34a6f89b4687b27·...·]-5">)</span><span·class="p">.</span><span·class="w">179 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="4014355553-5">(</span><span·class="ss">backup</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4014355553-6">{</span><span·class="ss">tmp_file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file</[·...·truncated·by·diffoscope;·len:·180,·SHA:·00eba09d4e0da375f3136c56a4965fa9f689940631bb9c9c7932b3e9bc1cc343·...·]-5">)</span><span·class="p">.</span><span·class="w">
  
180 </span><span·class="c1">%%·Opens·backup·media·for·write</span><span·class="w">180 </span><span·class="c1">%%·Opens·backup·media·for·write</span><span·class="w">
181 </span><span·class="c1">%%</span><span·class="w">181 </span><span·class="c1">%%</span><span·class="w">
182 </span><span·class="c1">%%·Returns·{ok,·OpaqueData}·or·{error,·Reason}</span><span·class="w">182 </span><span·class="c1">%%·Returns·{ok,·OpaqueData}·or·{error,·Reason}</span><span·class="w">
183 </span><span·class="nf">open_write</span><span·class="p"·data-group-id="5231963611-7">(</span><span·class="n">OpaqueData</span><span·class="p"·data-group-id="5231963611-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">183 </span><span·class="nf">open_write</span><span·class="p"·data-group-id="4014355553-7">(</span><span·class="n">OpaqueData</span><span·class="p"·data-group-id="4014355553-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
184 ····</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">184 ····</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">
185 ····</span><span·class="n">Tmp</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">concat</span><span·class="p"·data-group-id="5231963611-8">(</span><span·class="p"·data-group-id="5231963611-9">[</span><span·class="n">File</span><span·class="p">,</span><span·class="s">&quot;.BUPTMP&quot;</span><span·class="p"·data-group-id="5231963611-9">]</span><span·class="p"·data-group-id="5231[·...·truncated·by·diffoscope;·len:·6,·SHA:·22ac605caacb3ce107043ab618eae1392bb5ee83b1f991180162650faee7cbc0·...·]-8">)</span><span·class="p">,</span><span·class="w">185 ····</span><span·class="n">Tmp</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">concat</span><span·class="p"·data-group-id="4014355553-8">(</span><span·class="p"·data-group-id="4014355553-9">[</span><span·class="n">File</span><span·class="p">,</span><span·class="s">&quot;.BUPTMP&quot;</span><span·class="p"·data-group-id="4014355553-9">]</span><span·class="p"·data-group-id="4014[·...·truncated·by·diffoscope;·len:·6,·SHA:·71a14eb1c28ed3eab399295ae96bab1ecea43c28f26fa40dfa193a905b43048c·...·]-8">)</span><span·class="p">,</span><span·class="w">
186 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="5231963611-10">(</span><span·class="n">Tmp</span><span·class="p"·data-group-id="5231963611-10">)</span><span·class="p">,</span><span·class="w">186 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="4014355553-10">(</span><span·class="n">Tmp</span><span·class="p"·data-group-id="4014355553-10">)</span><span·class="p">,</span><span·class="w">
187 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="5231963611-11">(</span><span·class="p"·data-group-id="5231963611-12">[</span><span·class="p"·data-group-id="5231963611-13">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·132,·SHA:·d7efc899b825b2647612c145ca2926053f2a0d2fdb361030667261871541610b·...·]-13">}</span><span·class="p">,</span><span·class="w">187 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="4014355553-11">(</span><span·class="p"·data-group-id="4014355553-12">[</span><span·class="p"·data-group-id="4014355553-13">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·132,·SHA:·16c7e805e37d8ccced70a06b29645834af25a491d15517b79be199433967238e·...·]-13">}</span><span·class="p">,</span><span·class="w">
188 ························</span><span·class="p"·data-group-id="5231963611-15">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tmp</span><span·class="p"·data-group-id="5231963611-15">}</span><span·class="p">,</span><span·class="w">188 ························</span><span·class="p"·data-group-id="4014355553-15">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tmp</span><span·class="p"·data-group-id="4014355553-15">}</span><span·class="p">,</span><span·class="w">
189 ························</span><span·class="p"·data-group-id="5231963611-16">{</span><span·class="ss">repair</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="5231963611-16">}</span><span·class="p">,</span><span·class="w">189 ························</span><span·class="p"·data-group-id="4014355553-16">{</span><span·class="ss">repair</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="4014355553-16">}</span><span·class="p">,</span><span·class="w">
190 ························</span><span·class="p"·data-group-id="5231963611-17">{</span><span·class="ss">linkto</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="5231963611-18">(</span><span·class="p"·data-group-id="5231963611-18">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·130,·SHA:·8eb1922a6710ef05ad5e961cac1ef8cd1550e5320114a722727e9223ece2620b·...·]-11">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">190 ························</span><span·class="p"·data-group-id="4014355553-17">{</span><span·class="ss">linkto</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4014355553-18">(</span><span·class="p"·data-group-id="4014355553-18">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·130,·SHA:·ac53afe10289c3966968270213c946a82fd48fb96df223f4ae7a32221ac181f6·...·]-11">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
191 ········</span><span·class="p"·data-group-id="5231963611-19">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="5231963611-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 ········</span><span·class="p"·data-group-id="4014355553-19">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4014355553-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ············</span><span·class="p"·data-group-id="5231963611-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p"·data-group-id="5231963611-21">{</span><span·class="ss">tmp_file</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·527,·SHA:·b6ca913831b391c0489080090ca97af2dc386195228eec6dfc898cbe27acca50·...·]-20">}</span><span·class="p">;</span><span·class="w">192 ············</span><span·class="p"·data-group-id="4014355553-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p"·data-group-id="4014355553-21">{</span><span·class="ss">tmp_file</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·527,·SHA:·92946d47fa8704d063178d3550d52860f3376fa5b8eee203721043fc70602f7f·...·]-20">}</span><span·class="p">;</span><span·class="w">
193 ········</span><span·class="p"·data-group-id="5231963611-22">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-22">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 ········</span><span·class="p"·data-group-id="4014355553-22">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-22">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ············</span><span·class="p"·data-group-id="5231963611-23">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-23">}</span><span·class="w">194 ············</span><span·class="p"·data-group-id="4014355553-23">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-23">}</span><span·class="w">
195 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">195 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
196 </span><span·class="c1">%%·Writes·BackupItems·to·the·backup·media</span><span·class="w">196 </span><span·class="c1">%%·Writes·BackupItems·to·the·backup·media</span><span·class="w">
197 </span><span·class="c1">%%</span><span·class="w">197 </span><span·class="c1">%%</span><span·class="w">
198 </span><span·class="c1">%%·Returns·{ok,·OpaqueData}·or·{error,·Reason}</span><span·class="w">198 </span><span·class="c1">%%·Returns·{ok,·OpaqueData}·or·{error,·Reason}</span><span·class="w">
199 </span><span·class="nf">write</span><span·class="p"·data-group-id="5231963611-24">(</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BackupItems</span><span·class="p"·data-group-id="5231963611-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">199 </span><span·class="nf">write</span><span·class="p"·data-group-id="4014355553-24">(</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BackupItems</span><span·class="p"·data-group-id="4014355553-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
200 ····</span><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">200 ····</span><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">
201 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">log_terms</span><span·class="p"·data-group-id="5231963611-25">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BackupItems</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·2069bda1a873e7481b9628a080df420c40c47ededdb1ad4ac3d0c4843a5f9839·...·]-25">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">201 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">log_terms</span><span·class="p"·data-group-id="4014355553-25">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BackupItems</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·a24d12d0c727068e41f82b0623341b8ce5b27c6bbc1b680efc6a13df1fa2df85·...·]-25">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
202 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">202 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
203 ············</span><span·class="p"·data-group-id="5231963611-26">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="p"·data-group-id="5231963611-26">}</span><span·class="p">;</span><span·class="w">203 ············</span><span·class="p"·data-group-id="4014355553-26">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="p"·data-group-id="4014355553-26">}</span><span·class="p">;</span><span·class="w">
204 ········</span><span·class="p"·data-group-id="5231963611-27">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-27">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">204 ········</span><span·class="p"·data-group-id="4014355553-27">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-27">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
205 ············</span><span·class="nf">abort_write</span><span·class="p"·data-group-id="5231963611-28">(</span><span·class="n">B</span><span·class="p"·data-group-id="5231963611-28">)</span><span·class="p">,</span><span·class="w">205 ············</span><span·class="nf">abort_write</span><span·class="p"·data-group-id="4014355553-28">(</span><span·class="n">B</span><span·class="p"·data-group-id="4014355553-28">)</span><span·class="p">,</span><span·class="w">
206 ············</span><span·class="p"·data-group-id="5231963611-29">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-29">}</span><span·class="w">206 ············</span><span·class="p"·data-group-id="4014355553-29">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-29">}</span><span·class="w">
207 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">207 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
208 </span><span·class="c1">%%·Closes·the·backup·media·after·a·successful·backup</span><span·class="w">208 </span><span·class="c1">%%·Closes·the·backup·media·after·a·successful·backup</span><span·class="w">
209 </span><span·class="c1">%%</span><span·class="w">209 </span><span·class="c1">%%</span><span·class="w">
210 </span><span·class="c1">%%·Returns·{ok,·ReturnValueToUser}·or·{error,·Reason}</span><span·class="w">210 </span><span·class="c1">%%·Returns·{ok,·ReturnValueToUser}·or·{error,·Reason}</span><span·class="w">
211 </span><span·class="nf">commit_write</span><span·class="p"·data-group-id="5231963611-30">(</span><span·class="n">OpaqueData</span><span·class="p"·data-group-id="5231963611-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">211 </span><span·class="nf">commit_write</span><span·class="p"·data-group-id="4014355553-30">(</span><span·class="n">OpaqueData</span><span·class="p"·data-group-id="4014355553-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
212 ····</span><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">212 ····</span><span·class="n">B</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">
213 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">sync</span><span·class="p"·data-group-id="5231963611-31">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p"·data-group-id="5231963611-31">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">213 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">sync</span><span·class="p"·data-group-id="4014355553-31">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p"·data-group-id="4014355553-31">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
214 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5231963611-32">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p"·data-group-id="5231963611-32">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">215 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="4014355553-32">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p"·data-group-id="4014355553-32">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
216 ················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">216 ················</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
217 ····················</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="5231963611-33">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file</span><span·class="p"·data-group-id="5231963611-33">)</span><span·class="p">,</span><span·class="w">217 ····················</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="4014355553-33">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file</span><span·class="p"·data-group-id="4014355553-33">)</span><span·class="p">,</span><span·class="w">
218 ····················</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">rename</span><span·class="p"·data-group-id="5231963611-34">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">tmp_file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="o">#</span><sp[·...·truncated·by·diffoscope;·len:·120,·SHA:·91b02c14f00da9082b1de03161209daa4ab1fa0f773eff82933c96eb27605471·...·]-34">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">218 ····················</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">rename</span><span·class="p"·data-group-id="4014355553-34">(</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">tmp_file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="o">#</span><sp[·...·truncated·by·diffoscope;·len:·120,·SHA:·ea7f0814ae495da68d4f3a90de92053eefe1879a6495527f308ba175216face5·...·]-34">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
219 ························</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 ························</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ····························</span><span·class="p"·data-group-id="5231963611-35">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·4de7f29d602187f65e35142c31c991b8601fe27209e024320308678a0c535ef7·...·]-35">}</span><span·class="p">;</span><span·class="w">220 ····························</span><span·class="p"·data-group-id="4014355553-35">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">B</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·92f36a893b12d8293c8d7fd3e9d0b5991cd16b3923e69d3df15dd4870d7d4df9·...·]-35">}</span><span·class="p">;</span><span·class="w">
221 ························</span><span·class="p"·data-group-id="5231963611-36">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-36">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">221 ························</span><span·class="p"·data-group-id="4014355553-36">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-36">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
222 ····························</span><span·class="p"·data-group-id="5231963611-37">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-37">}</span><span·class="w">222 ····························</span><span·class="p"·data-group-id="4014355553-37">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-37">}</span><span·class="w">
223 ····················</span><span·class="k">end</span><span·class="p">;</span><span·class="w">223 ····················</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
224 ················</span><span·class="p"·data-group-id="5231963611-38">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-38">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 ················</span><span·class="p"·data-group-id="4014355553-38">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-38">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 ····················</span><span·class="p"·data-group-id="5231963611-39">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-39">}</span><span·class="w">225 ····················</span><span·class="p"·data-group-id="4014355553-39">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-39">}</span><span·class="w">
226 ············</span><span·class="k">end</span><span·class="p">;</span><span·class="w">226 ············</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
227 ········</span><span·class="p"·data-group-id="5231963611-40">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-40">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 ········</span><span·class="p"·data-group-id="4014355553-40">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-40">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ············</span><span·class="p"·data-group-id="5231963611-41">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-41">}</span><span·class="w">228 ············</span><span·class="p"·data-group-id="4014355553-41">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-41">}</span><span·class="w">
229 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">229 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
230 </span><span·class="c1">%%·Closes·the·backup·media·after·an·interrupted·backup</span><span·class="w">230 </span><span·class="c1">%%·Closes·the·backup·media·after·an·interrupted·backup</span><span·class="w">
231 </span><span·class="c1">%%</span><span·class="w">231 </span><span·class="c1">%%</span><span·class="w">
232 </span><span·class="c1">%%·Returns·{ok,·ReturnValueToUser}·or·{error,·Reason}</span><span·class="w">232 </span><span·class="c1">%%·Returns·{ok,·ReturnValueToUser}·or·{error,·Reason}</span><span·class="w">
233 </span><span·class="nf">abort_write</span><span·class="p"·data-group-id="5231963611-42">(</span><span·class="n">BackupRef</span><span·class="p"·data-group-id="5231963611-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">233 </span><span·class="nf">abort_write</span><span·class="p"·data-group-id="4014355553-42">(</span><span·class="n">BackupRef</span><span·class="p"·data-group-id="4014355553-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
234 ····</span><span·class="n">Res</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5231963611-43">(</span><span·class="n">BackupRef</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p"·data-group-id="5231963611-43">)</span><span·class="p">,</span><span·class="w">234 ····</span><span·class="n">Res</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="4014355553-43">(</span><span·class="n">BackupRef</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file_desc</span><span·class="p"·data-group-id="4014355553-43">)</span><span·class="p">,</span><span·class="w">
235 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="5231963611-44">(</span><span·class="n">BackupRef</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">tmp_file</span><span·class="p"·data-group-id="5231963611-44">)</span><span·class="p">,</span><span·class="w">235 ····</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="4014355553-44">(</span><span·class="n">BackupRef</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">tmp_file</span><span·class="p"·data-group-id="4014355553-44">)</span><span·class="p">,</span><span·class="w">
236 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Res</span><span·class="w">·</span><span·class="k">of</span><span·class="w">236 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Res</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
237 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">237 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
238 ············</span><span·class="p"·data-group-id="5231963611-45">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BackupRef</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·fb8238ac15eeae4de8141cbc1c14fd4022c33277cea2df9786f7b6a039a9bc63·...·]-45">}</span><span·class="p">;</span><span·class="w">238 ············</span><span·class="p"·data-group-id="4014355553-45">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BackupRef</span><span·class="o">#</span><span·class="ss">backup</span><span·class="p">.</span><span·class="ss">file</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·baafdf1e5dd8adcdac1234726f6f317e14361f3b5e12299492041a71ca957c64·...·]-45">}</span><span·class="p">;</span><span·class="w">
239 ········</span><span·class="p"·data-group-id="5231963611-46">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-46">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">239 ········</span><span·class="p"·data-group-id="4014355553-46">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-46">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
240 ············</span><span·class="p"·data-group-id="5231963611-47">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-47">}</span><span·class="w">240 ············</span><span·class="p"·data-group-id="4014355553-47">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-47">}</span><span·class="w">
241 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">241 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
242 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">242 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
243 </span><span·class="c1">%%·Restore·callback·interface</span><span·class="w">243 </span><span·class="c1">%%·Restore·callback·interface</span><span·class="w">
244 </span><span·class="w">244 </span><span·class="w">
245 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5231963611-48">(</span><span·class="ss">restore</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5231963611-49">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file_de[·...·truncated·by·diffoscope;·len:·180,·SHA:·9ad4877348a565b4877bcb72165be6dd6f9e117771054163b3ae6c1d32d30600·...·]-48">)</span><span·class="p">.</span><span·class="w">245 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="4014355553-48">(</span><span·class="ss">restore</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4014355553-49">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file_de[·...·truncated·by·diffoscope;·len:·180,·SHA:·b99b602d99b3003e1497a28680f0495df84374b15174ee4c1b6b52e9455a1818·...·]-48">)</span><span·class="p">.</span><span·class="w">
  
246 </span><span·class="c1">%%·Opens·backup·media·for·read</span><span·class="w">246 </span><span·class="c1">%%·Opens·backup·media·for·read</span><span·class="w">
247 </span><span·class="c1">%%</span><span·class="w">247 </span><span·class="c1">%%</span><span·class="w">
248 </span><span·class="c1">%%·Returns·{ok,·OpaqueData}·or·{error,·Reason}</span><span·class="w">248 </span><span·class="c1">%%·Returns·{ok,·OpaqueData}·or·{error,·Reason}</span><span·class="w">
249 </span><span·class="nf">open_read</span><span·class="p"·data-group-id="5231963611-50">(</span><span·class="n">OpaqueData</span><span·class="p"·data-group-id="5231963611-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">249 </span><span·class="nf">open_read</span><span·class="p"·data-group-id="4014355553-50">(</span><span·class="n">OpaqueData</span><span·class="p"·data-group-id="4014355553-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
250 ····</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">250 ····</span><span·class="n">File</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">OpaqueData</span><span·class="p">,</span><span·class="w">
251 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">read_file_info</span><span·class="p"·data-group-id="5231963611-51">(</span><span·class="n">File</span><span·class="p"·data-group-id="5231963611-51">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">251 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">read_file_info</span><span·class="p"·data-group-id="4014355553-51">(</span><span·class="n">File</span><span·class="p"·data-group-id="4014355553-51">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
252 ········</span><span·class="p"·data-group-id="5231963611-52">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-52">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">252 ········</span><span·class="p"·data-group-id="4014355553-52">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-52">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
253 ············</span><span·class="p"·data-group-id="5231963611-53">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-53">}</span><span·class="p">;</span><span·class="w">253 ············</span><span·class="p"·data-group-id="4014355553-53">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-53">}</span><span·class="p">;</span><span·class="w">
254 ········</span><span·class="p">_</span><span·class="n">FileInfo</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="c1">%%·file·exists</span><span·class="w">254 ········</span><span·class="p">_</span><span·class="n">FileInfo</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="c1">%%·file·exists</span><span·class="w">
255 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="5231963611-54">(</span><span·class="p"·data-group-id="5231963611-55">[</span><span·class="p"·data-group-id="5231963611-56">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·4cf99e7527eb4dd8e7409b6e8698116195892c6779b63cd748b5d273f9831b33·...·]-56">}</span><span·class="p">,</span><span·class="w">255 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="4014355553-54">(</span><span·class="p"·data-group-id="4014355553-55">[</span><span·class="p"·data-group-id="4014355553-56">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·b7f541bcdc7552789397917b082636d192711a020068d3b0c8137494ec1c6eaf·...·]-56">}</span><span·class="p">,</span><span·class="w">
256 ································</span><span·class="p"·data-group-id="5231963611-57">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="5231963611-58">(</span><span·class="p"·data-group-id="5231963611-58">)</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·784f3fa5f164eab499aee9ad89dc56824aa16274ffdc7181ae05559779d3cb67·...·]-57">}</span><span·class="p">,</span><span·class="w">256 ································</span><span·class="p"·data-group-id="4014355553-57">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="4014355553-58">(</span><span·class="p"·data-group-id="4014355553-58">)</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·7f349531dd604ee8610d42ef6e67df2cb9bfea21a66fe30b3e39a56ed7aa0fbc·...·]-57">}</span><span·class="p">,</span><span·class="w">
257 ································</span><span·class="p"·data-group-id="5231963611-59">{</span><span·class="ss">repair</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="5231963611-59">}</span><span·class="p">,</span><span·class="w">257 ································</span><span·class="p"·data-group-id="4014355553-59">{</span><span·class="ss">repair</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="4014355553-59">}</span><span·class="p">,</span><span·class="w">
258 ································</span><span·class="p"·data-group-id="5231963611-60">{</span><span·class="ss">mode</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">read_only</span><span·class="p"·data-group-id="5231963611-60">}</span><span·class="p">,</span><span·class="w">258 ································</span><span·class="p"·data-group-id="4014355553-60">{</span><span·class="ss">mode</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">read_only</span><span·class="p"·data-group-id="4014355553-60">}</span><span·class="p">,</span><span·class="w">
259 ································</span><span·class="p"·data-group-id="5231963611-61">{</span><span·class="ss">linkto</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="5231963611-62">(</span><span·class="p"·data-group-id="5231963611-62">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·130,·SHA:·d82c2f13af355568b7d3123414aa2be945177ea3b7bc466749f0b9b558110ac9·...·]-54">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">259 ································</span><span·class="p"·data-group-id="4014355553-61">{</span><span·class="ss">linkto</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4014355553-62">(</span><span·class="p"·data-group-id="4014355553-62">)</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·130,·SHA:·7d389bdc2d1d30182ecb46b0e855b6617a0a9eccc3dce3be170682eb3281653a·...·]-54">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
260 ················</span><span·class="p"·data-group-id="5231963611-63">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="5231963611-63">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">260 ················</span><span·class="p"·data-group-id="4014355553-63">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4014355553-63">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
261 ····················</span><span·class="p"·data-group-id="5231963611-64">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">restore</span><span·class="p"·data-group-id="5231963611-65">{</span><span·class="ss">file</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·527,·SHA:·aaad9043282f58131b2aab83a3322cf7fecb110c5c0181359796e819c9fef4e2·...·]-64">}</span><span·class="p">;</span><span·class="w">261 ····················</span><span·class="p"·data-group-id="4014355553-64">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">restore</span><span·class="p"·data-group-id="4014355553-65">{</span><span·class="ss">file</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·527,·SHA:·621515f35dff8529daac13b38f709454ab1b1e401c96c564b2c7e17810af51b8·...·]-64">}</span><span·class="p">;</span><span·class="w">
262 ················</span><span·class="p"·data-group-id="5231963611-66">{</span><span·class="ss">repaired</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·246,·SHA:·2e27405b7bde8452632aaab8523fe918445ebf2dfed8f4e571ae20ae74561a50·...·]-66">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">262 ················</span><span·class="p"·data-group-id="4014355553-66">{</span><span·class="ss">repaired</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·246,·SHA:·f837d403899c79cb9aa7cf6ffc5654750a6e34d1738527433d9d6ed871b899c6·...·]-66">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
263 ····················</span><span·class="p"·data-group-id="5231963611-68">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">restore</span><span·class="p"·data-group-id="5231963611-69">{</span><span·class="ss">file</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·527,·SHA:·7e7ca0ab8ea3dd47f34aad762e0cbe43eee1ec59a79a9344eae1330be2152ba8·...·]-68">}</span><span·class="p">;</span><span·class="w">263 ····················</span><span·class="p"·data-group-id="4014355553-68">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">restore</span><span·class="p"·data-group-id="4014355553-69">{</span><span·class="ss">file</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·527,·SHA:·e48fc45de3cfa677f3816d6be935b011478bbfacf840c7415212b7c4eae43071·...·]-68">}</span><span·class="p">;</span><span·class="w">
264 ················</span><span·class="p"·data-group-id="5231963611-70">{</span><span·class="ss">repaired</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·57,·SHA:·bb14460e9681cd6db8ff56d8886f7252e5791ffdbb60293bb33ebbfff4c2121b·...·]-70">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">264 ················</span><span·class="p"·data-group-id="4014355553-70">{</span><span·class="ss">repaired</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·57,·SHA:·0a7115b0151a2662b91e1ac51f9b661da61f6752431d870ecd42605ba4c25544·...·]-70">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
265 ····················</span><span·class="p"·data-group-id="5231963611-71">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">restore</span><span·class="p"·data-group-id="5231963611-72">{</span><span·class="ss">file</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·527,·SHA:·56c8037b6ce7af32ef4cf88a13f068ff77398b5f84630c58a827631acc25e450·...·]-71">}</span><span·class="p">;</span><span·class="w">265 ····················</span><span·class="p"·data-group-id="4014355553-71">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">restore</span><span·class="p"·data-group-id="4014355553-72">{</span><span·class="ss">file</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·527,·SHA:·370fe683a1987cd468b9d74d3e396474c5e1c950a0dd1e5e0239737aad9ec9f2·...·]-71">}</span><span·class="p">;</span><span·class="w">
266 ················</span><span·class="p"·data-group-id="5231963611-73">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-73">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">266 ················</span><span·class="p"·data-group-id="4014355553-73">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-73">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
267 ····················</span><span·class="p"·data-group-id="5231963611-74">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5231963611-74">}</span><span·class="w">267 ····················</span><span·class="p"·data-group-id="4014355553-74">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4014355553-74">}</span><span·class="w">
268 ············</span><span·class="k">end</span><span·class="w">268 ············</span><span·class="k">end</span><span·class="w">
269 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">269 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
270 </span><span·class="c1">%%·Reads·BackupItems·from·the·backup·media</span><span·class="w">270 </span><span·class="c1">%%·Reads·BackupItems·from·the·backup·media</span><span·class="w">
271 </span><span·class="c1">%%</span><span·class="w">271 </span><span·class="c1">%%</span><span·class="w">
272 </span><span·class="c1">%%·Returns·{ok,·OpaqueData,·BackupItems}·or·{error,·Reason}</span><span·class="w">272 </span><span·class="c1">%%·Returns·{ok,·OpaqueData,·BackupItems}·or·{error,·Reason}</span><span·class="w">
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127 <h2·id="mnesia_access-callback-behavior"·class="section-heading">127 <h2·id="mnesia_access-callback-behavior"·class="section-heading">
128 ··<a·href="#mnesia_access-callback-behavior"·class="hover-link">128 ··<a·href="#mnesia_access-callback-behavior"·class="hover-link">
129 ····<i·class="ri-link-m"·aria-hidden="true"></i>129 ····<i·class="ri-link-m"·aria-hidden="true"></i>
130 ··</a>130 ··</a>
131 ··<span·class="text">mnesia_access·Callback·Behavior</span>131 ··<span·class="text">mnesia_access·Callback·Behavior</span>
132 </h2>132 </h2>
133 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7936141212-1">(</span><span·class="ss">mnesia_frag</span><span·class="p"·data-group-id="7936141212-1">)</span><span·class="p">.</span><span·class="w">133 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="7708030834-1">(</span><span·class="ss">mnesia_frag</span><span·class="p"·data-group-id="7708030834-1">)</span><span·class="p">.</span><span·class="w">
  
134 </span><span·class="c1">%%·Callback·functions·when·accessed·within·an·activity</span><span·class="w">134 </span><span·class="c1">%%·Callback·functions·when·accessed·within·an·activity</span><span·class="w">
135 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7936141212-2">(</span><span·class="p"·data-group-id="7936141212-3">[</span><span·class="w">135 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7708030834-2">(</span><span·class="p"·data-group-id="7708030834-3">[</span><span·class="w">
136 ·········</span><span·class="ss">lock</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">136 ·········</span><span·class="ss">lock</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">
137 ·········</span><span·class="ss">write</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete_object</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">137 ·········</span><span·class="ss">write</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">delete_object</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">
138 ·········</span><span·class="ss">read</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">match_object</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all_keys</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">138 ·········</span><span·class="ss">read</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">match_object</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">all_keys</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">
139 ·········</span><span·class="ss">select</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">select</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">select_cont</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">139 ·········</span><span·class="ss">select</span><span·class="p">/</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">select</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">select_cont</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">
140 ·········</span><span·class="ss">index_match_object</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">index_read</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">140 ·········</span><span·class="ss">index_match_object</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">index_read</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">
141 ·········</span><span·class="ss">foldl</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foldr</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">table_info</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">141 ·········</span><span·class="ss">foldl</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foldr</span><span·class="p">/</span><span·class="mi">6</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">table_info</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">
142 ·········</span><span·class="ss">first</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">next</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prev</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">last</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">142 ·········</span><span·class="ss">first</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">next</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">prev</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">last</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">
143 ·········</span><span·class="ss">clear_table</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">143 ·········</span><span·class="ss">clear_table</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">
144 ········</span><span·class="p"·data-group-id="7936141212-3">]</span><span·class="p"·data-group-id="7936141212-2">)</span><span·class="p">.</span><span·class="w">144 ········</span><span·class="p"·data-group-id="7708030834-3">]</span><span·class="p"·data-group-id="7708030834-2">)</span><span·class="p">.</span><span·class="w">
  
145 </span><span·class="c1">%%·Callback·functions·which·provides·transparent</span><span·class="w">145 </span><span·class="c1">%%·Callback·functions·which·provides·transparent</span><span·class="w">
146 </span><span·class="c1">%%·access·of·fragmented·tables·from·any·activity</span><span·class="w">146 </span><span·class="c1">%%·access·of·fragmented·tables·from·any·activity</span><span·class="w">
147 </span><span·class="c1">%%·access·context.</span><span·class="w">147 </span><span·class="c1">%%·access·context.</span><span·class="w">
  
148 </span><span·class="nf">lock</span><span·class="p"·data-group-id="7936141212-4">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-5">{</span><span·class="ss">table</[·...·truncated·by·diffoscope;·len:·276,·SHA:·db21e35417cbe694a2a3ed2e41cbf69ac0508e3c7bc4f14d3f56a5f88776951a·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">148 </span><span·class="nf">lock</span><span·class="p"·data-group-id="7708030834-4">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-5">{</span><span·class="ss">table</[·...·truncated·by·diffoscope;·len:·276,·SHA:·11bea2357b0df6498f2c63c3ff275f4346e31b8abc3b56ad0ae76290b66976c7·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
149 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7936141212-6">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7936141212-6">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">149 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7708030834-6">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7708030834-6">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
150 ········</span><span·class="p"·data-group-id="7936141212-7">[</span><span·class="n">Tab</span><span·class="p"·data-group-id="7936141212-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">150 ········</span><span·class="p"·data-group-id="7708030834-7">[</span><span·class="n">Tab</span><span·class="p"·data-group-id="7708030834-7">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
151 ············</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="7936141212-8">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-9">{</span><span·class="ss">table</[·...·truncated·by·diffoscope;·len:·252,·SHA:·d74d7d2a1d35deacdb5fd357f2b0d085105e8eec2092bf886c15b0ec9da48fc7·...·]-8">)</span><span·class="p">;</span><span·class="w">151 ············</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="7708030834-8">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-9">{</span><span·class="ss">table</[·...·truncated·by·diffoscope;·len:·252,·SHA:·ea1be2e66b4b7cee906c40f929419a97a1ca07553863a40742df49275cfb091d·...·]-8">)</span><span·class="p">;</span><span·class="w">
152 ········</span><span·class="n">Frags</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">152 ········</span><span·class="n">Frags</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
153 ············</span><span·class="n">DeepNs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-10">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="7936141212-11">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">O[·...·truncated·by·diffoscope;·len:·389,·SHA:·af32e8ecb25e1a68c72645338a432c09147e85c0d3c971db08a7d6d04047e37e·...·]-11">)</span><span·class="w">·</span><span·class="p">||</span><span·class="w">153 ············</span><span·class="n">DeepNs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-10">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="7708030834-11">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">O[·...·truncated·by·diffoscope;·len:·389,·SHA:·4ded705a13a962eddb29c649ede80b9ba4f11f6a3892397babba2ead0a72daea·...·]-11">)</span><span·class="w">·</span><span·class="p">||</span><span·class="w">
154 ·························</span><span·class="n">F</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="n">Frags</span><span·class="p"·data-group-id="7936141212-10">]</span><span·class="p">,</span><span·class="w">154 ·························</span><span·class="n">F</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="n">Frags</span><span·class="p"·data-group-id="7708030834-10">]</span><span·class="p">,</span><span·class="w">
155 ············</span><span·class="nc">mnesia_lib</span><span·class="p">:</span><span·class="nf">uniq</span><span·class="p"·data-group-id="7936141212-13">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7936141212-14">(</span><span·class="n">DeepNs</span><span·class="p"·data-group-id="7936141212-14">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·9c76c16b03a1a78934233a99ebb984126fe3db548ef3298554c5ce2cabea0775·...·]-13">)</span><span·class="w">155 ············</span><span·class="nc">mnesia_lib</span><span·class="p">:</span><span·class="nf">uniq</span><span·class="p"·data-group-id="7708030834-13">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7708030834-14">(</span><span·class="n">DeepNs</span><span·class="p"·data-group-id="7708030834-14">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·f57cdc2c74ad52eb7a813d4b61dc47f8dccffed661f240482811378225be54e3·...·]-13">)</span><span·class="w">
156 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">156 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
  
157 </span><span·class="nf">lock</span><span·class="p"·data-group-id="7936141212-15">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LockItem</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·75,·SHA:·3ef9e72a4ad040bc022ed6b69af04c98d52c7615e2546c9276248a9cd4a6362e·...·]-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">lock</span><span·class="p"·data-group-id="7708030834-15">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LockItem</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·75,·SHA:·bd26c3bfcbc54775b678c3748d486dccc6da08250edc4af17add39a6ef5f61dc·...·]-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="7936141212-16">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LockItem</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·75,·SHA:·3ef9e72a4ad040bc022ed6b69af04c98d52c7615e2546c9276248a9cd4a6362e·...·]-16">)</span><span·class="p">.</span><span·class="w">158 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="7708030834-16">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">LockItem</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·75,·SHA:·bd26c3bfcbc54775b678c3748d486dccc6da08250edc4af17add39a6ef5f61dc·...·]-16">)</span><span·class="p">.</span><span·class="w">
  
159 </span><span·class="nf">write</span><span·class="p"·data-group-id="7936141212-17">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·63e505a3c2b3aec216b4affaee97f8b30cb05230814e9c1b4abe5dc894b92208·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 </span><span·class="nf">write</span><span·class="p"·data-group-id="7708030834-17">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·15a801cd77500d22986234cbac2c9b19ab1891d2283c7b7dc798a22062cf1355·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record_to_frag_name</span><span·class="p"·data-group-id="7936141212-18">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rec</span><span·class="p"·data-group-id="7936141212-18">)</span><span·class="p">,</span><span·class="w">160 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record_to_frag_name</span><span·class="p"·data-group-id="7708030834-18">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rec</span><span·class="p"·data-group-id="7708030834-18">)</span><span·class="p">,</span><span·class="w">
161 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7936141212-19">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·67c6b2a006ccae16fe08e3cd07e1733a6c06f50aa80a163829ea83b240c93238·...·]-19">)</span><span·class="p">.</span><span·class="w">161 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7708030834-19">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·209ec8f3d3ee099a43097683b6b9625fe330725709c5316ea01268e37ad8fdff·...·]-19">)</span><span·class="p">.</span><span·class="w">
  
162 </span><span·class="nf">delete</span><span·class="p"·data-group-id="7936141212-20">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·366deafb3dae1056c2f92ed47c0658ce2dd93aaf768967b37daec3c0219b9a9f·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">162 </span><span·class="nf">delete</span><span·class="p"·data-group-id="7708030834-20">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·0e8ea4188434979e35d21bd9ac1c86560c71cc593108e007a77b9dc16fd3a9ba·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
163 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">key_to_frag_name</span><span·class="p"·data-group-id="7936141212-21">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7936141212-21">)</span><span·class="p">,</span><span·class="w">163 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">key_to_frag_name</span><span·class="p"·data-group-id="7708030834-21">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7708030834-21">)</span><span·class="p">,</span><span·class="w">
164 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="7936141212-22">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·77eb12f90fb238c353dcdf8a645915185fb1f3d524d99b4df778b196eb95aca3·...·]-22">)</span><span·class="p">.</span><span·class="w">164 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="7708030834-22">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·c7b31c07dec4ecfe5dc51de423fe2f895870da0d7244e4f5fbf88dcad91ccaf1·...·]-22">)</span><span·class="p">.</span><span·class="w">
  
165 </span><span·class="nf">delete_object</span><span·class="p"·data-group-id="7936141212-23">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·63e505a3c2b3aec216b4affaee97f8b30cb05230814e9c1b4abe5dc894b92208·...·]-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">165 </span><span·class="nf">delete_object</span><span·class="p"·data-group-id="7708030834-23">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·15a801cd77500d22986234cbac2c9b19ab1891d2283c7b7dc798a22062cf1355·...·]-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
166 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record_to_frag_name</span><span·class="p"·data-group-id="7936141212-24">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rec</span><span·class="p"·data-group-id="7936141212-24">)</span><span·class="p">,</span><span·class="w">166 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">record_to_frag_name</span><span·class="p"·data-group-id="7708030834-24">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rec</span><span·class="p"·data-group-id="7708030834-24">)</span><span·class="p">,</span><span·class="w">
167 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">delete_object</span><span·class="p"·data-group-id="7936141212-25">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·67c6b2a006ccae16fe08e3cd07e1733a6c06f50aa80a163829ea83b240c93238·...·]-25">)</span><span·class="p">.</span><span·class="w">167 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">delete_object</span><span·class="p"·data-group-id="7708030834-25">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·209ec8f3d3ee099a43097683b6b9625fe330725709c5316ea01268e37ad8fdff·...·]-25">)</span><span·class="p">.</span><span·class="w">
  
168 </span><span·class="nf">read</span><span·class="p"·data-group-id="7936141212-26">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·366deafb3dae1056c2f92ed47c0658ce2dd93aaf768967b37daec3c0219b9a9f·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">168 </span><span·class="nf">read</span><span·class="p"·data-group-id="7708030834-26">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·0e8ea4188434979e35d21bd9ac1c86560c71cc593108e007a77b9dc16fd3a9ba·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
169 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">key_to_frag_name</span><span·class="p"·data-group-id="7936141212-27">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7936141212-27">)</span><span·class="p">,</span><span·class="w">169 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">key_to_frag_name</span><span·class="p"·data-group-id="7708030834-27">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7708030834-27">)</span><span·class="p">,</span><span·class="w">
170 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><span·class="p"·data-group-id="7936141212-28">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·77eb12f90fb238c353dcdf8a645915185fb1f3d524d99b4df778b196eb95aca3·...·]-28">)</span><span·class="p">.</span><span·class="w">170 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><span·class="p"·data-group-id="7708030834-28">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·145,·SHA:·c7b31c07dec4ecfe5dc51de423fe2f895870da0d7244e4f5fbf88dcad91ccaf1·...·]-28">)</span><span·class="p">.</span><span·class="w">
  
171 </span><span·class="nf">match_object</span><span·class="p"·data-group-id="7936141212-29">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·148,·SHA:·ea44171f567a1086a819876c48953ffa14a576f8b5d3335abbaad5655248ee5f·...·]-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 </span><span·class="nf">match_object</span><span·class="p"·data-group-id="7708030834-29">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·148,·SHA:·e52942804de94298277c2da05f890776d28accec45050a578ee76f92e2fe2ff0·...·]-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ····</span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-30">[</span><span·class="p"·data-group-id="7936141212-31">{</span><span·class="n">HeadPat</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-32">[</span><span·class="p"·data-group-id="7936141212-32">]<[·...·truncated·by·diffoscope;·len:·293,·SHA:·c2ee9df9394ffc093affb52593acd0bd7d571f11b374489ba1b7fad54649a1fa·...·]-30">]</span><span·class="p">,</span><span·class="w">172 ····</span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-30">[</span><span·class="p"·data-group-id="7708030834-31">{</span><span·class="n">HeadPat</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-32">[</span><span·class="p"·data-group-id="7708030834-32">]<[·...·truncated·by·diffoscope;·len:·293,·SHA:·057f05ffa0e899e9566ab06fdfe45c01364b772a8bf65d0c59fe6e2fe979c737·...·]-30">]</span><span·class="p">,</span><span·class="w">
173 ····</span><span·class="nf">select</span><span·class="p"·data-group-id="7936141212-34">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·150,·SHA:·e7348c3244256be590f98ba709f4a14e84a591bf15a0b48218d43f3918cdd9f3·...·]-34">)</span><span·class="p">.</span><span·class="w">173 ····</span><span·class="nf">select</span><span·class="p"·data-group-id="7708030834-34">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·150,·SHA:·a92e0921f1d72bc8bff50f1e174ccbdfcffb529509cec0e481e8a92a302922f7·...·]-34">)</span><span·class="p">.</span><span·class="w">
  
174 </span><span·class="nf">select</span><span·class="p"·data-group-id="7936141212-35">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·150,·SHA:·e7348c3244256be590f98ba709f4a14e84a591bf15a0b48218d43f3918cdd9f3·...·]-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">174 </span><span·class="nf">select</span><span·class="p"·data-group-id="7708030834-35">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·150,·SHA:·a92e0921f1d72bc8bff50f1e174ccbdfcffb529509cec0e481e8a92a302922f7·...·]-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
175 ····</span><span·class="nf">do_select</span><span·class="p"·data-group-id="7936141212-36">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·150,·SHA:·e7348c3244256be590f98ba709f4a14e84a591bf15a0b48218d43f3918cdd9f3·...·]-36">)</span><span·class="p">.</span><span·class="w">175 ····</span><span·class="nf">do_select</span><span·class="p"·data-group-id="7708030834-36">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·150,·SHA:·a92e0921f1d72bc8bff50f1e174ccbdfcffb529509cec0e481e8a92a302922f7·...·]-36">)</span><span·class="p">.</span><span·class="w">
  
  
176 </span><span·class="nf">select</span><span·class="p"·data-group-id="7936141212-37">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·226,·SHA:·8cf2edf261a290c698499a2c5c7b0b7e491fb9b7719816ddabe886977411c326·...·]-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 </span><span·class="nf">select</span><span·class="p"·data-group-id="7708030834-37">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·226,·SHA:·d493fbb670e2508c863a9f49c67c65d53ea7abba9a028aaf55a94c24cc6a2659·...·]-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ····</span><span·class="nf">init_select</span><span·class="p"·data-group-id="7936141212-38">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·226,·SHA:·8cf2edf261a290c698499a2c5c7b0b7e491fb9b7719816ddabe886977411c326·...·]-38">)</span><span·class="p">.</span><span·class="w">177 ····</span><span·class="nf">init_select</span><span·class="p"·data-group-id="7708030834-38">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·226,·SHA:·d493fbb670e2508c863a9f49c67c65d53ea7abba9a028aaf55a94c24cc6a2659·...·]-38">)</span><span·class="p">.</span><span·class="w">
  
178 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7936141212-39">(</span><span·class="p">_</span><span·class="n">Tid</span><span·class="p">,</span><span·class="p">_</span><span·class="p">,</span><span·class="p"·data-group-id="7936141212-40">{</span><span·class="ss">frag_cont</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·369,·SHA:·4cd351a02ddb58f9748c4c8d6388b97f1271976baf105960745ce06bb1ce13cb·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;$end_of_table&#39;</span><span·class="p">;</span><span·class="w">178 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7708030834-39">(</span><span·class="p">_</span><span·class="n">Tid</span><span·class="p">,</span><span·class="p">_</span><span·class="p">,</span><span·class="p"·data-group-id="7708030834-40">{</span><span·class="ss">frag_cont</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·369,·SHA:·d42882f76267c0ef9fc2ccd0b194ee6d100eb424aeaeffb7e5fe059c2162b66a·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;$end_of_table&#39;</span><span·class="p">;</span><span·class="w">
179 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7936141212-42">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="p"·data-group-id="7936141212-43">{</span><span·class="ss">frag_cont</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·636,·SHA:·f77c763c84fa43b488e65988c0c92906cda5312b2ee63817b2cb731907df64ea·...·]-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">179 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7708030834-42">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="p"·data-group-id="7708030834-43">{</span><span·class="ss">frag_cont</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·636,·SHA:·7cc29ac9de118c48aa7664bb6a673aac2cffcc47b6f54f69f558458f05036a86·...·]-42">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
180 ····</span><span·class="p"·data-group-id="7936141212-46">{</span><span·class="n">Spec</span><span·class="p">,</span><span·class="n">LockKind</span><span·class="p">,</span><span·class="n">Limit</span><span·class="p"·data-group-id="7936141212-46">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">180 ····</span><span·class="p"·data-group-id="7708030834-46">{</span><span·class="n">Spec</span><span·class="p">,</span><span·class="n">LockKind</span><span·class="p">,</span><span·class="n">Limit</span><span·class="p"·data-group-id="7708030834-46">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">
181 ····</span><span·class="n">InitFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7936141212-47">(</span><span·class="n">FixedSpec</span><span·class="p"·data-group-id="7936141212-47">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">d[·...·truncated·by·diffoscope;·len:·351,·SHA:·64e48e431713edf9c215f708da2c4a4c05a568361672fb70e1a2cf07e1e984fe·...·]-48">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">181 ····</span><span·class="n">InitFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7708030834-47">(</span><span·class="n">FixedSpec</span><span·class="p"·data-group-id="7708030834-47">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">d[·...·truncated·by·diffoscope;·len:·351,·SHA:·5de999556dd0be818cd14c0cf95dac433f1d9c92c51114d3401ce5f0f74ee6a7·...·]-48">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
182 ····</span><span·class="n">Res</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">fun_select</span><span·class="p"·data-group-id="7936141212-49">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="n">Tab</span><span·class="p">,</span><span·class="n">Spec</span><span·class="p">,</span><span·class="n">LockKind</span><sp[·...·truncated·by·diffoscope;·len:·296,·SHA:·dec64fd4c755dc11293b6e2552f952a619abdbf4ed0096752a52cca268954ddb·...·]-49">)</span><span·class="p">,</span><span·class="w">182 ····</span><span·class="n">Res</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">fun_select</span><span·class="p"·data-group-id="7708030834-49">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="n">Tab</span><span·class="p">,</span><span·class="n">Spec</span><span·class="p">,</span><span·class="n">LockKind</span><sp[·...·truncated·by·diffoscope;·len:·296,·SHA:·73de5d034997f0c62ad792b5c9d798dae6ff4d54eab034ef2d7589e510044ff3·...·]-49">)</span><span·class="p">,</span><span·class="w">
183 ····</span><span·class="nf">frag_sel_cont</span><span·class="p"·data-group-id="7936141212-50">(</span><span·class="n">Res</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><span·class="p"·data-group-id="7936141212-50">)</span><span·class="p">;</span><span·class="w">183 ····</span><span·class="nf">frag_sel_cont</span><span·class="p"·data-group-id="7708030834-50">(</span><span·class="n">Res</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><span·class="p"·data-group-id="7708030834-50">)</span><span·class="p">;</span><span·class="w">
184 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7936141212-51">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="p"·data-group-id="7936141212-52">{</span><span·class="ss">frag_cont</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·272,·SHA:·5577a33c1c311693fc2c5327c65fab56d794d837ca994d889427909e8ae8741a·...·]-51">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7708030834-51">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="p"·data-group-id="7708030834-52">{</span><span·class="ss">frag_cont</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·272,·SHA:·6e9dbcf06011fa46e242cfab9fcb6cf78a008848799b26261defeefa591e423e·...·]-51">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ····</span><span·class="nf">frag_sel_cont</span><span·class="p"·data-group-id="7936141212-53">(</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7936141212-54">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">[·...·truncated·by·diffoscope;·len:·232,·SHA:·f26cb2acde27cdd242263d249ae9441e5584ac6a5ba70bb70a5dfde5c773d62a·...·]-53">)</span><span·class="p">;</span><span·class="w">185 ····</span><span·class="nf">frag_sel_cont</span><span·class="p"·data-group-id="7708030834-53">(</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7708030834-54">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">[·...·truncated·by·diffoscope;·len:·232,·SHA:·f4d1e6749204ec71850eddc4dc8ff2918782747b4de73efe84930fd4b1488186·...·]-53">)</span><span·class="p">;</span><span·class="w">
186 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7936141212-55">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="n">Else</span><span·class="p"·data-group-id="7936141212-55">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">186 </span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7708030834-55">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="n">Else</span><span·class="p"·data-group-id="7708030834-55">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
187 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7936141212-56">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="n">Else</span><span·class="p"·data-group-id="7936141212-56">)</span><span·class="p">.</span><span·class="w">187 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">select_cont</span><span·class="p"·data-group-id="7708030834-56">(</span><span·class="n">Tid</span><span·class="p">,</span><span·class="n">Ts</span><span·class="p">,</span><span·class="n">Else</span><span·class="p"·data-group-id="7708030834-56">)</span><span·class="p">.</span><span·class="w">
  
188 </span><span·class="nf">all_keys</span><span·class="p"·data-group-id="7936141212-57">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·70,·SHA:·b66870ecb87169bfff4f79f6705f1e9949fb0bc883629497ecd3e34d8eba5402·...·]-57">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">188 </span><span·class="nf">all_keys</span><span·class="p"·data-group-id="7708030834-57">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·70,·SHA:·ff5b129fc3280467229c46934be5a9a4fa155061d975838b7f313997c2f0bfba·...·]-57">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
189 ····</span><span·class="n">Match</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-58">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">all_keys</span><span·class="p"·data-group-id="7936141212-59">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·211,·SHA:·5cca3a6e7040bc49a7a9c8b92abf3fefe4af9606b19db62ebd08b6f862692521·...·]-59">)</span><span·class="w">189 ····</span><span·class="n">Match</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-58">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">all_keys</span><span·class="p"·data-group-id="7708030834-59">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·211,·SHA:·fa6e67a173587d6df0a611a527925f2ee5a50e1611736f2fcccc9df48074c770·...·]-59">)</span><span·class="w">
190 ·············</span><span·class="p">||</span><span·class="w">·</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7936141212-60">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7936141212-60">)</span><span·class="p"·data-group-id="7936141212-58">]</span><span·class="p">,</span><span·class="w">190 ·············</span><span·class="p">||</span><span·class="w">·</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7708030834-60">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7708030834-60">)</span><span·class="p"·data-group-id="7708030834-58">]</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7936141212-61">(</span><span·class="n">Match</span><span·class="p"·data-group-id="7936141212-61">)</span><span·class="p">.</span><span·class="w">191 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7708030834-61">(</span><span·class="n">Match</span><span·class="p"·data-group-id="7708030834-61">)</span><span·class="p">.</span><span·class="w">
  
192 </span><span·class="nf">clear_table</span><span·class="p"·data-group-id="7936141212-62">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·65,·SHA:·770849ce60cf0feecf8624f50e0c040ed008cec8d3c9645649e64aaf65d00f0d·...·]-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 </span><span·class="nf">clear_table</span><span·class="p"·data-group-id="7708030834-62">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·65,·SHA:·3786802e890af5a58bbf16f0d7b6948ea99aa21a615f372be49d82daf491f6d2·...·]-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="p"·data-group-id="7936141212-63">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">clear_table</span><span·class="p"·data-group-id="7936141212-64">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·608,·SHA:·cd4f08c512cb207650461ad75a1f620221bc06885e5dbc844bbe124d9f6bd133·...·]-63">]</span><span·class="p">,</span><span·class="w">193 ····</span><span·class="p"·data-group-id="7708030834-63">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">clear_table</span><span·class="p"·data-group-id="7708030834-64">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·608,·SHA:·a5c9171e770e7d57e7b9fe9bb0fd5e4bd58ebff05aa9a338a38c727c4c8b37ff·...·]-63">]</span><span·class="p">,</span><span·class="w">
194 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">194 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
195 </span><span·class="nf">index_match_object</span><span·class="p"·data-group-id="7936141212-66">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·219,·SHA:·f4131029374cf6c1ac9cdbf2b2c8f4bbc67254a9d9e5b7c4095b458d414edda9·...·]-66">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">195 </span><span·class="nf">index_match_object</span><span·class="p"·data-group-id="7708030834-66">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·219,·SHA:·7ffc24503eaac82a7a9018baef990692fb5f7a7a8ec02022def938a8f23fbf22·...·]-66">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
196 ····</span><span·class="n">Match</span><span·class="w">·</span><span·class="o">=</span><span·class="w">196 ····</span><span·class="n">Match</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
197 ········</span><span·class="p"·data-group-id="7936141212-67">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">index_match_object</span><span·class="p"·data-group-id="7936141212-68">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·370,·SHA:·51263400405232871ac4ed68790887ecee3e62c5f2320aa7b68e107c9ba3b7d7·...·]-68">)</span><span·class="w">197 ········</span><span·class="p"·data-group-id="7708030834-67">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">index_match_object</span><span·class="p"·data-group-id="7708030834-68">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·370,·SHA:·8cbb7ee231021572e889f29c3c2a9b568197ce7eef34378e3e5c57dc385a52e9·...·]-68">)</span><span·class="w">
198 ·········</span><span·class="p">||</span><span·class="w">·</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7936141212-69">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7936141212-69">)</span><span·class="p"·data-group-id="7936141212-67">]</span><span·class="p">,</span><span·class="w">198 ·········</span><span·class="p">||</span><span·class="w">·</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7708030834-69">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7708030834-69">)</span><span·class="p"·data-group-id="7708030834-67">]</span><span·class="p">,</span><span·class="w">
199 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7936141212-70">(</span><span·class="n">Match</span><span·class="p"·data-group-id="7936141212-70">)</span><span·class="p">.</span><span·class="w">199 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7708030834-70">(</span><span·class="n">Match</span><span·class="p"·data-group-id="7708030834-70">)</span><span·class="p">.</span><span·class="w">
  
200 </span><span·class="nf">index_read</span><span·class="p"·data-group-id="7936141212-71">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·219,·SHA:·ebcd64e25ae61fdd7a3cc6e5b47d2dbf42c1a53508ed9972cab1572134db9686·...·]-71">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">200 </span><span·class="nf">index_read</span><span·class="p"·data-group-id="7708030834-71">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·219,·SHA:·618b8aab55dc4fcab938136a9223dd4af583a4dd84dcea951f88e111f970879c·...·]-71">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
201 ····</span><span·class="n">Match</span><span·class="w">·</span><span·class="o">=</span><span·class="w">201 ····</span><span·class="n">Match</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
202 ········</span><span·class="p"·data-group-id="7936141212-72">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">index_read</span><span·class="p"·data-group-id="7936141212-73">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·362,·SHA:·d6b39650bc85898092f05d45f9ae854b76cd5eb6f198d61925be6549acb34199·...·]-73">)</span><span·class="w">202 ········</span><span·class="p"·data-group-id="7708030834-72">[</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">index_read</span><span·class="p"·data-group-id="7708030834-73">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·362,·SHA:·150db217a37d3e544b9facde64733793e46eee289fdd417509854afab8567b8e·...·]-73">)</span><span·class="w">
203 ·········</span><span·class="p">||</span><span·class="w">·</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7936141212-74">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7936141212-74">)</span><span·class="p"·data-group-id="7936141212-72">]</span><span·class="p">,</span><span·class="w">203 ·········</span><span·class="p">||</span><span·class="w">·</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7708030834-74">(</span><span·class="n">Tab</span><span·class="p"·data-group-id="7708030834-74">)</span><span·class="p"·data-group-id="7708030834-72">]</span><span·class="p">,</span><span·class="w">
204 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7936141212-75">(</span><span·class="n">Match</span><span·class="p"·data-group-id="7936141212-75">)</span><span·class="p">.</span><span·class="w">204 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="7708030834-75">(</span><span·class="n">Match</span><span·class="p"·data-group-id="7708030834-75">)</span><span·class="p">.</span><span·class="w">
  
205 </span><span·class="nf">foldl</span><span·class="p"·data-group-id="7936141212-76">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·218,·SHA:·5fe5ee13ea13e1148059325b27c967d576c77d7a13f5cb3ef37692d7591e82e5·...·]-76">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 </span><span·class="nf">foldl</span><span·class="p"·data-group-id="7708030834-76">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·218,·SHA:·bc74be45a7eb97b937f8bd45a9a61a793e4d6c0539837a87ffe42a319c0a79a3·...·]-76">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 ····</span><span·class="n">Fun2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7936141212-77">(</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="7936141212-77">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 ····</span><span·class="n">Fun2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7708030834-77">(</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="7708030834-77">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ···················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7936141212-78">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·217,·SHA:·490d0df5938db7b497a9c23ac9b8baf602a195680ccfe6a429b737e42533d712·...·]-78">)</span><span·class="w">207 ···················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7708030834-78">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·217,·SHA:·5d3f988a055a7fccfcdd9b3530f99d41860cd81914fa93354f32bc3bf0282635·...·]-78">)</span><span·class="w">
208 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">208 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
209 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7936141212-79">(</span><span·class="n">Fun2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7936141212-80">(</sp[·...·truncated·by·diffoscope;·len:·124,·SHA:·6467f98bf571025f985dfebdb9c3fdcc5b106946a31a99d684569670f82350b1·...·]-79">)</span><span·class="p">.</span><span·class="w">209 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7708030834-79">(</span><span·class="n">Fun2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7708030834-80">(</sp[·...·truncated·by·diffoscope;·len:·124,·SHA:·dabe657f5317fb54e2d306a7bb9d644a9328a1ff068c831ccc875428c0eb034c·...·]-79">)</span><span·class="p">.</span><span·class="w">
  
210 </span><span·class="nf">foldr</span><span·class="p"·data-group-id="7936141212-81">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·218,·SHA:·5fe5ee13ea13e1148059325b27c967d576c77d7a13f5cb3ef37692d7591e82e5·...·]-81">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 </span><span·class="nf">foldr</span><span·class="p"·data-group-id="7708030834-81">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·218,·SHA:·bc74be45a7eb97b937f8bd45a9a61a793e4d6c0539837a87ffe42a319c0a79a3·...·]-81">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ····</span><span·class="n">Fun2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7936141212-82">(</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="7936141212-82">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">211 ····</span><span·class="n">Fun2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7708030834-82">(</span><span·class="n">Frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p"·data-group-id="7708030834-82">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
212 ···················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7936141212-83">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·217,·SHA:·490d0df5938db7b497a9c23ac9b8baf602a195680ccfe6a429b737e42533d712·...·]-83">)</span><span·class="w">212 ···················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7708030834-83">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·217,·SHA:·5d3f988a055a7fccfcdd9b3530f99d41860cd81914fa93354f32bc3bf0282635·...·]-83">)</span><span·class="w">
213 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">213 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
214 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7936141212-84">(</span><span·class="n">Fun2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7936141212-85">(</sp[·...·truncated·by·diffoscope;·len:·124,·SHA:·75c40a6c94814f8e44b61683a6692a8198aa2f0527f56003373d249721716a24·...·]-84">)</span><span·class="p">.</span><span·class="w">214 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7708030834-84">(</span><span·class="n">Fun2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_names</span><span·class="p"·data-group-id="7708030834-85">(</sp[·...·truncated·by·diffoscope;·len:·124,·SHA:·cdd5fffb2f874722903c734701029a4ebf3678ae12704d7743eddb5de884fc4e·...·]-84">)</span><span·class="p">.</span><span·class="w">
  
215 </span><span·class="nf">table_info</span><span·class="p"·data-group-id="7936141212-86">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7936141212-87">{</span><span·class="n">Tab</s[·...·truncated·by·diffoscope;·len:·248,·SHA:·4f70b9b7c2ea390b5f951d7b05b85d56c42b6c6f438ccf41f8a563cc4b4384ce·...·]-86">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">215 </span><span·class="nf">table_info</span><span·class="p"·data-group-id="7708030834-86">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7708030834-87">{</span><span·class="n">Tab</s[·...·truncated·by·diffoscope;·len:·248,·SHA:·9d3b9ef2340187d149f7fe96f4d3130ed4fb45345c98b249afa53dc5b9e74509·...·]-86">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
216 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">key_to_frag_name</span><span·class="p"·data-group-id="7936141212-88">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7936141212-88">)</span><span·class="p">,</span><span·class="w">216 ····</span><span·class="n">Frag</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">key_to_frag_name</span><span·class="p"·data-group-id="7708030834-88">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7708030834-88">)</span><span·class="p">,</span><span·class="w">
217 ····</span><span·class="nf">table_info2</span><span·class="p"·data-group-id="7936141212-89">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·141,·SHA:·e04ed7f97977970690b3f3ef5f52047860a922e19d46d359a95db0f729226110·...·]-89">)</span><span·class="p">;</span><span·class="w">217 ····</span><span·class="nf">table_info2</span><span·class="p"·data-group-id="7708030834-89">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·141,·SHA:·f10d22e4f9f96e72489c526cff2bae5c09687f11cfdfa75e7497e74d4529c872·...·]-89">)</span><span·class="p">;</span><span·class="w">
218 </span><span·class="nf">table_info</span><span·class="p"·data-group-id="7936141212-90">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·66,·SHA:·cc45a7ad28f3ba1a67b3b8b801b7335f23a5b696bc1d2ac928ba8a9fce02c7f7·...·]-90">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">218 </span><span·class="nf">table_info</span><span·class="p"·data-group-id="7708030834-90">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·66,·SHA:·7a5a16f816d2ad038e8327d8065137bdf25be2aef1e25d0cae57cbb63a151aa1·...·]-90">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
219 ····</span><span·class="nf">table_info2</span><span·class="p"·data-group-id="7936141212-91">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·140,·SHA:·971a165f60d2ae24008c4ac269dd0bf8241eebf1a76ccda06f63f6c68581e16d·...·]-91">)</span><span·class="p">.</span><span·class="w">219 ····</span><span·class="nf">table_info2</span><span·class="p"·data-group-id="7708030834-91">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·140,·SHA:·9f5b452c58ca60abfb26d9bd7b8ae92fd2ccb67e7fcdff81ad98bff02b81014a·...·]-91">)</span><span·class="p">.</span><span·class="w">
  
220 </span><span·class="nf">table_info2</span><span·class="p"·data-group-id="7936141212-92">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·141,·SHA:·e04ed7f97977970690b3f3ef5f52047860a922e19d46d359a95db0f729226110·...·]-92">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">220 </span><span·class="nf">table_info2</span><span·class="p"·data-group-id="7708030834-92">(</span><span·class="n">ActivityId</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Opaque</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·141,·SHA:·f10d22e4f9f96e72489c526cff2bae5c09687f11cfdfa75e7497e74d4529c872·...·]-92">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
221 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Item</span><span·class="w">·</span><span·class="k">of</span><span·class="w">221 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Item</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
222 ········</span><span·class="nb">size</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 ········</span><span·class="nb">size</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 ············</span><span·class="n">SumFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7936141212-93">(</span><span·class="p"·data-group-id="7936141212-94">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="7936141212-94">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·4fc0047f59c92d20ae47e9484a022e0ebc307f328eeeb4299f5664cbfd350766·...·]-93">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Size</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">223 ············</span><span·class="n">SumFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7708030834-93">(</span><span·class="p"·data-group-id="7708030834-94">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="7708030834-94">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·eb019633998c2007739644614540244f9159c7fffce0e205c9170bcd54f4a8ca·...·]-93">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Size</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
224 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7936141212-95">(</span><span·class="n">SumFun</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_size</span><span·class="p"·data-group-id="7936141212-96">(</sp[·...·truncated·by·diffoscope;·len:·282,·SHA:·9adb1618fea755bc8c7718bb3627840916ec63593f38b7bb893eaaca452a5ae0·...·]-95">)</span><span·class="p">;</span><span·class="w">224 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7708030834-95">(</span><span·class="n">SumFun</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_size</span><span·class="p"·data-group-id="7708030834-96">(</sp[·...·truncated·by·diffoscope;·len:·282,·SHA:·a0c4cadd7def752d66ebfe36d0e512631dad8711095bd9fc1e8139dc864eae83·...·]-95">)</span><span·class="p">;</span><span·class="w">
225 ········</span><span·class="nb">memory</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">225 ········</span><span·class="nb">memory</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
226 ············</span><span·class="n">SumFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7936141212-97">(</span><span·class="p"·data-group-id="7936141212-98">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="7936141212-98">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·4fc0047f59c92d20ae47e9484a022e0ebc307f328eeeb4299f5664cbfd350766·...·]-97">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Size</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">226 ············</span><span·class="n">SumFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7708030834-97">(</span><span·class="p"·data-group-id="7708030834-98">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Size</span><span·class="p"·data-group-id="7708030834-98">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·88,·SHA:·eb019633998c2007739644614540244f9159c7fffce0e205c9170bcd54f4a8ca·...·]-97">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Size</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
227 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7936141212-99">(</span><span·class="n">SumFun</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_memory</span><span·class="p"·data-group-id="7936141212-100">(<[·...·truncated·by·diffoscope;·len:·286,·SHA:·40a1c8096bbe152acaeaf66f22d38015a764718cd6fd0596448295ae86668e14·...·]-99">)</span><span·class="p">;</span><span·class="w">227 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7708030834-99">(</span><span·class="n">SumFun</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">frag_memory</span><span·class="p"·data-group-id="7708030834-100">(<[·...·truncated·by·diffoscope;·len:·286,·SHA:·d7b79447fb2fed769211116e6b47c052c651006b4781d51a785dbe961d4fbbfe·...·]-99">)</span><span·class="p">;</span><span·class="w">
228 ········</span><span·class="ss">base_table</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">228 ········</span><span·class="ss">base_table</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
229 ············</span><span·class="nf">lookup_prop</span><span·class="p"·data-group-id="7936141212-101">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">base_table</span><span·class="p"·data-group-id="7936141212-101">)</span><span·class="p">;</span><span·class="w">229 ············</span><span·class="nf">lookup_prop</span><span·class="p"·data-group-id="7708030834-101">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">base_table</span><span·class="p"·data-group-id="7708030834-101">)</span><span·class="p">;</span><span·class="w">
230 ········</span><span·class="ss">node_pool</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">230 ········</span><span·class="ss">node_pool</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
231 ············</span><span·class="nf">lookup_prop</span><span·class="p"·data-group-id="7936141212-102">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node_pool</span><span·class="p"·data-group-id="7936141212-102">)</span><span·class="p">;</span><span·class="w">231 ············</span><span·class="nf">lookup_prop</span><span·class="p"·data-group-id="7708030834-102">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">node_pool</span><span·class="p"·data-group-id="7708030834-102">)</span><span·class="p">;</span><span·class="w">
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127 <h2·id="mnesia_frag_hash-callback-behavior"·class="section-heading">127 <h2·id="mnesia_frag_hash-callback-behavior"·class="section-heading">
128 ··<a·href="#mnesia_frag_hash-callback-behavior"·class="hover-link">128 ··<a·href="#mnesia_frag_hash-callback-behavior"·class="hover-link">
129 ····<i·class="ri-link-m"·aria-hidden="true"></i>129 ····<i·class="ri-link-m"·aria-hidden="true"></i>
130 ··</a>130 ··</a>
131 ··<span·class="text">mnesia_frag_hash·Callback·Behavior</span>131 ··<span·class="text">mnesia_frag_hash·Callback·Behavior</span>
132 </h2>132 </h2>
133 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2460611067-1">(</span><span·class="ss">mnesia_frag_hash</span><span·class="p"·data-group-id="2460611067-1">)</span><span·class="p">.</span><span·class="w">133 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4882385481-1">(</span><span·class="ss">mnesia_frag_hash</span><span·class="p"·data-group-id="4882385481-1">)</span><span·class="p">.</span><span·class="w">
134 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="2460611067-2">(</span><span·class="p"·data-group-id="2460611067-3">[</span><span·class="p"·data-group-id="2460611067-4">{</span><span·class="ss">nowarn_deprecated_function</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·461,·SHA:·103264eaa7cd865185cf98037b876fb872a4fea0e5596da01ea582299c3d40bf·...·]-2">)</span><span·class="p">.</span><span·class="w">134 </span><span·class="p">-</span><span·class="na">compile</span><span·class="p"·data-group-id="4882385481-2">(</span><span·class="p"·data-group-id="4882385481-3">[</span><span·class="p"·data-group-id="4882385481-4">{</span><span·class="ss">nowarn_deprecated_function</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·461,·SHA:·1daa27da22f4952ac9440631ef8e77beb228f8e8e984789741d4f3e4d1e8f4f4·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
135 </span><span·class="c1">%%·Fragmented·Table·Hashing·callback·functions</span><span·class="w">135 </span><span·class="c1">%%·Fragmented·Table·Hashing·callback·functions</span><span·class="w">
136 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2460611067-7">(</span><span·class="p"·data-group-id="2460611067-8">[</span><span·class="w">136 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4882385481-7">(</span><span·class="p"·data-group-id="4882385481-8">[</span><span·class="w">
137 ·········</span><span·class="ss">init_state</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">137 ·········</span><span·class="ss">init_state</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
138 ·········</span><span·class="ss">add_frag</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">138 ·········</span><span·class="ss">add_frag</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
139 ·········</span><span·class="ss">del_frag</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">139 ·········</span><span·class="ss">del_frag</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
140 ·········</span><span·class="ss">key_to_frag_number</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">140 ·········</span><span·class="ss">key_to_frag_number</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
141 ·········</span><span·class="ss">match_spec_to_frag_numbers</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">141 ·········</span><span·class="ss">match_spec_to_frag_numbers</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">
142 ········</span><span·class="p"·data-group-id="2460611067-8">]</span><span·class="p"·data-group-id="2460611067-7">)</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="4250967698-1">(</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="w">142 ········</span><span·class="p"·data-group-id="4882385481-8">]</span><span·class="p"·data-group-id="4882385481-7">)</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="4903203735-1">(</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="w">
143 ····</span><span·class="p"·data-group-id="4250967698-2">{</span><span·class="ss">n_fragments</span><span·class="p">,</span><span·class="w">143 ····</span><span·class="p"·data-group-id="4903203735-2">{</span><span·class="ss">n_fragments</span><span·class="p">,</span><span·class="w">
144 ·····</span><span·class="ss">next_n_to_split</span><span·class="p">,</span><span·class="w">144 ·····</span><span·class="ss">next_n_to_split</span><span·class="p">,</span><span·class="w">
145 ·····</span><span·class="ss">n_doubles</span><span·class="p">,</span><span·class="w">145 ·····</span><span·class="ss">n_doubles</span><span·class="p">,</span><span·class="w">
146 ·····</span><span·class="ss">function</span><span·class="p"·data-group-id="4250967698-2">}</span><span·class="p"·data-group-id="4250967698-1">)</span><span·class="p">.</span><span·class="w">146 ·····</span><span·class="ss">function</span><span·class="p"·data-group-id="4903203735-2">}</span><span·class="p"·data-group-id="4903203735-1">)</span><span·class="p">.</span><span·class="w">
  
147 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">147 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
148 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">init_state</span><span·class="p"·data-group-id="4250967698-3">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4250967698-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">NewState</span><span·class="w">·</span><span·class="k">when</span><span·class="w">148 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">init_state</span><span·class="p"·data-group-id="4903203735-3">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4903203735-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">NewState</span><span·class="w">·</span><span·class="k">when</span><span·class="w">
149 ······</span><span·class="n">Tab</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="4250967698-4">(</span><span·class="p"·data-group-id="4250967698-4">)</span><span·class="p">,</span><span·class="w">149 ······</span><span·class="n">Tab</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="4903203735-4">(</span><span·class="p"·data-group-id="4903203735-4">)</span><span·class="p">,</span><span·class="w">
150 ······</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-5">(</span><span·class="p"·data-group-id="4250967698-5">)</span><span·class="p">,</span><span·class="w">150 ······</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-5">(</span><span·class="p"·data-group-id="4903203735-5">)</span><span·class="p">,</span><span·class="w">
151 ······</span><span·class="n">NewState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-6">(</span><span·class="p"·data-group-id="4250967698-6">)</span><span·class="p">.</span><span·class="w">151 ······</span><span·class="n">NewState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-6">(</span><span·class="p"·data-group-id="4903203735-6">)</span><span·class="p">.</span><span·class="w">
152 </span><span·class="nf">init_state</span><span·class="p"·data-group-id="4250967698-7">(</span><span·class="p">_</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4250967698-7">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">State</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">152 </span><span·class="nf">init_state</span><span·class="p"·data-group-id="4903203735-7">(</span><span·class="p">_</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4903203735-7">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">State</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
153 ····</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-8">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">153 ····</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-8">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
154 ················</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">154 ················</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
155 ················</span><span·class="ss">n_doubles</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">155 ················</span><span·class="ss">n_doubles</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
156 ················</span><span·class="ss">function</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">phash2</span><span·class="p"·data-group-id="4250967698-8">}</span><span·class="p">.</span><span·class="w">156 ················</span><span·class="ss">function</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">phash2</span><span·class="p"·data-group-id="4903203735-8">}</span><span·class="p">.</span><span·class="w">
  
157 </span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4250967698-9">(</span><span·class="p"·data-group-id="4250967698-10">{</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><sp[·...·truncated·by·diffoscope;·len:·164,·SHA:·4a76e949a7a3de32cbd42ed37caa2306559947aac002ca1ee6b08ccaa832b293·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4903203735-9">(</span><span·class="p"·data-group-id="4903203735-10">{</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><sp[·...·truncated·by·diffoscope;·len:·164,·SHA:·2670f12b86b43e3969ca200062bfed62bd82823ca7bcf1cd75f2fe002f4e962e·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-11">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">158 ····</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-11">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="p">,</span><span·class="w">
159 ················</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="p">,</span><span·class="w">159 ················</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="p">,</span><span·class="w">
160 ················</span><span·class="ss">n_doubles</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="p">,</span><span·class="w">160 ················</span><span·class="ss">n_doubles</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="p">,</span><span·class="w">
161 ················</span><span·class="ss">function</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">phash</span><span·class="p"·data-group-id="4250967698-11">}</span><span·class="p">.</span><span·class="w">161 ················</span><span·class="ss">function</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">phash</span><span·class="p"·data-group-id="4903203735-11">}</span><span·class="p">.</span><span·class="w">
  
162 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">162 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
163 </span><span·class="w">163 </span><span·class="w">
164 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4250967698-12">(</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-13">(</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·452,·SHA:·24aad937edb2f58aa59af9ba8d87bf9bc742b5cb4ad6629e8c0d6f35a8182252·...·]-14">}</span><span·class="w">·</span><span·class="k">when</span><span·class="w">164 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4903203735-12">(</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-13">(</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·452,·SHA:·cc88ca6d6c6aeea0bced3d8e4cf983f5240de7cc880bd8a088e222ccbd0febb3·...·]-14">}</span><span·class="w">·</span><span·class="k">when</span><span·class="w">
165 ······</span><span·class="n">NewState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-15">(</span><span·class="p"·data-group-id="4250967698-15">)</span><span·class="p">,</span><span·class="w">165 ······</span><span·class="n">NewState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-15">(</span><span·class="p"·data-group-id="4903203735-15">)</span><span·class="p">,</span><span·class="w">
166 ······</span><span·class="n">IterFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-16">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4250967698-17">(</span><span·class="p"·data-group-id="4250967698-17">)</span><span·class="p"·data-group-id="4250967698-16">]</span><span·class="p">,</span><span·class="w">166 ······</span><span·class="n">IterFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-16">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4903203735-17">(</span><span·class="p"·data-group-id="4903203735-17">)</span><span·class="p"·data-group-id="4903203735-16">]</span><span·class="p">,</span><span·class="w">
167 ······</span><span·class="n">AdditionalLockFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-18">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4250967698-19">(</span><span·class="p"·data-group-id="4250967698-19">)</span><span·class="p"·data-group-id="4250967698-18">]</span><span·class="p">.</span><span·class="w">167 ······</span><span·class="n">AdditionalLockFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-18">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4903203735-19">(</span><span·class="p"·data-group-id="4903203735-19">)</span><span·class="p"·data-group-id="4903203735-18">]</span><span·class="p">.</span><span·class="w">
168 </span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4250967698-20">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-21">{</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·569,·SHA:·f0ddc9a52d45e7e4bde5b08276e9750ec2a207b41b30e3cd50f13f61efa6098c·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">168 </span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4903203735-20">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-21">{</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·569,·SHA:·6c03b3b82b4b32c79ece321b83c7d85d7753b9755613e9a3d64c48d964a4f176·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
169 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">SplitN</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">169 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">SplitN</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
170 ····</span><span·class="n">NewN</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">170 ····</span><span·class="n">NewN</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
171 ····</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4250967698-22">(</span><span·class="n">L</span><span·class="p"·data-group-id="4250967698-22">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">·</span><span·class="k">of</span><span·class="w">171 ····</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4903203735-22">(</span><span·class="n">L</span><span·class="p"·data-group-id="4903203735-22">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
172 ········</span><span·class="n">P2</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">P2</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">P</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 ········</span><span·class="n">P2</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">P2</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">P</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ············</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-23">{</span><span·class="ss">n_fragments</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="n">NewN</span><span·class="p">,</span><span·class="w">173 ············</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-23">{</span><span·class="ss">n_fragments</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="n">NewN</span><span·class="p">,</span><span·class="w">
174 ·····························</span><span·class="ss">n_doubles</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">174 ·····························</span><span·class="ss">n_doubles</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
175 ·····························</span><span·class="ss">next_n_to_split</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4250967698-23">}</span><span·class="p">;</span><span·class="w">175 ·····························</span><span·class="ss">next_n_to_split</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4903203735-23">}</span><span·class="p">;</span><span·class="w">
176 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ············</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-24">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">NewN</span><span·class="p">,</span><span·class="w">177 ············</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-24">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">NewN</span><span·class="p">,</span><span·class="w">
178 ·····························</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="p"·data-group-id="4250967698-24">}</span><span·class="w">178 ·····························</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="p"·data-group-id="4903203735-24">}</span><span·class="w">
179 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">179 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
180 ····</span><span·class="p"·data-group-id="4250967698-25">{</span><span·class="n">State2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-26">[</span><span·class="n">SplitN</span><span·class="p"·data-group-id="4250967698-26">]</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·204,·SHA:·f88179375c94a4a742834210d1c2321a12cad391b8ee0338aaaf42f1e3b7b7e4·...·]-25">}</span><span·class="p">;</span><span·class="w">180 ····</span><span·class="p"·data-group-id="4903203735-25">{</span><span·class="n">State2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-26">[</span><span·class="n">SplitN</span><span·class="p"·data-group-id="4903203735-26">]</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·204,·SHA:·fe4b3bce416bea5bdd73f058b9a82274e77a3e66510b41cda9e9e86b1ccc6065·...·]-25">}</span><span·class="p">;</span><span·class="w">
181 </span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4250967698-28">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4250967698-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">181 </span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4903203735-28">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4903203735-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
182 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4250967698-29">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4250967698-29">)</span><span·class="p">,</span><span·class="w">182 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4903203735-29">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4903203735-29">)</span><span·class="p">,</span><span·class="w">
183 ····</span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4250967698-30">(</span><span·class="n">State</span><span·class="p"·data-group-id="4250967698-30">)</span><span·class="p">.</span><span·class="w">183 ····</span><span·class="nf">add_frag</span><span·class="p"·data-group-id="4903203735-30">(</span><span·class="n">State</span><span·class="p"·data-group-id="4903203735-30">)</span><span·class="p">.</span><span·class="w">
  
184 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">184 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
185 </span><span·class="w">185 </span><span·class="w">
186 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4250967698-31">(</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-32">(</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·452,·SHA:·c8fad6494ad3f4909aa4432026adfa2ad4fdda7a7183643d49c1372b2cca1e6c·...·]-33">}</span><span·class="w">·</span><span·class="k">when</span><span·class="w">186 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4903203735-31">(</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-32">(</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·452,·SHA:·84272b1d494bc67aa00413f4e0ec542cc73963e146b7e5234ea8ad66b1544faa·...·]-33">}</span><span·class="w">·</span><span·class="k">when</span><span·class="w">
187 ······</span><span·class="n">NewState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-34">(</span><span·class="p"·data-group-id="4250967698-34">)</span><span·class="p">,</span><span·class="w">187 ······</span><span·class="n">NewState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-34">(</span><span·class="p"·data-group-id="4903203735-34">)</span><span·class="p">,</span><span·class="w">
188 ······</span><span·class="n">IterFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-35">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4250967698-36">(</span><span·class="p"·data-group-id="4250967698-36">)</span><span·class="p"·data-group-id="4250967698-35">]</span><span·class="p">,</span><span·class="w">188 ······</span><span·class="n">IterFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-35">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4903203735-36">(</span><span·class="p"·data-group-id="4903203735-36">)</span><span·class="p"·data-group-id="4903203735-35">]</span><span·class="p">,</span><span·class="w">
189 ······</span><span·class="n">AdditionalLockFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-37">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4250967698-38">(</span><span·class="p"·data-group-id="4250967698-38">)</span><span·class="p"·data-group-id="4250967698-37">]</span><span·class="p">.</span><span·class="w">189 ······</span><span·class="n">AdditionalLockFrags</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-37">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4903203735-38">(</span><span·class="p"·data-group-id="4903203735-38">)</span><span·class="p"·data-group-id="4903203735-37">]</span><span·class="p">.</span><span·class="w">
190 </span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4250967698-39">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-40">{</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·569,·SHA:·04052a713ba7d1108ce15c24d4ee727335b48981722859cc18b3b80c9842c3c2·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">190 </span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4903203735-39">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-40">{</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·569,·SHA:·ea75e136811f646f492d90349b9a0179cae6ad847a9e9398a7512be08419c0e9·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
191 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">SplitN</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">191 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">SplitN</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
192 ····</span><span·class="k">if</span><span·class="w">192 ····</span><span·class="k">if</span><span·class="w">
193 ········</span><span·class="n">P</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">193 ········</span><span·class="n">P</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
194 ············</span><span·class="n">L2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">194 ············</span><span·class="n">L2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
195 ············</span><span·class="n">MergeN</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4250967698-41">(</span><span·class="n">L2</span><span·class="p"·data-group-id="4250967698-41">)</span><span·class="p">,</span><span·class="w">195 ············</span><span·class="n">MergeN</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4903203735-41">(</span><span·class="n">L2</span><span·class="p"·data-group-id="4903203735-41">)</span><span·class="p">,</span><span·class="w">
196 ············</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-42">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">196 ············</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-42">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
197 ······································</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">MergeN</span><span·class="p">,</span><span·class="w">197 ······································</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">MergeN</span><span·class="p">,</span><span·class="w">
198 ······································</span><span·class="ss">n_doubles</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L2</span><span·class="p"·data-group-id="4250967698-42">}</span><span·class="p">,</span><span·class="w">198 ······································</span><span·class="ss">n_doubles</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="n">L2</span><span·class="p"·data-group-id="4903203735-42">}</span><span·class="p">,</span><span·class="w">
199 ············</span><span·class="p"·data-group-id="4250967698-43">{</span><span·class="n">State2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-44">[</span><span·class="n">N</span><span·class="p"·data-group-id="4250967698-44">]</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·201,·SHA:·357ff8a104c77efae09cba0eace560acee55c50d35939c06ba52566a4a7706a6·...·]-43">}</span><span·class="p">;</span><span·class="w">199 ············</span><span·class="p"·data-group-id="4903203735-43">{</span><span·class="n">State2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-44">[</span><span·class="n">N</span><span·class="p"·data-group-id="4903203735-44">]</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·201,·SHA:·97c0e89a094b552eb1883a57451d6bec29236b45265c46c26c046173fe9ffbd3·...·]-43">}</span><span·class="p">;</span><span·class="w">
200 ········</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">200 ········</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
201 ············</span><span·class="n">MergeN</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="p">,</span><span·class="w">201 ············</span><span·class="n">MergeN</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">P</span><span·class="p">,</span><span·class="w">
202 ············</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-46">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">202 ············</span><span·class="n">State2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-46">{</span><span·class="ss">n_fragments</span><span·class="w">·····</span><span·class="o">=</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
203 ······································</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">MergeN</span><span·class="p"·data-group-id="4250967698-46">}</span><span·class="p">,</span><span·class="w">203 ······································</span><span·class="ss">next_n_to_split</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">MergeN</span><span·class="p"·data-group-id="4903203735-46">}</span><span·class="p">,</span><span·class="w">
204 ············</span><span·class="p"·data-group-id="4250967698-47">{</span><span·class="n">State2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-48">[</span><span·class="n">N</span><span·class="p"·data-group-id="4250967698-48">]</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·201,·SHA:·55cf5d0e86870806d9e401c764bd580e721948ebdc92559bfd3f3131f31139e5·...·]-47">}</span><span·class="w">204 ············</span><span·class="p"·data-group-id="4903203735-47">{</span><span·class="n">State2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-48">[</span><span·class="n">N</span><span·class="p"·data-group-id="4903203735-48">]</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·201,·SHA:·d4abda1eb84a0685bc354502d2f6cbd0a1dd577f3aab652a17ae12e68809e0a4·...·]-47">}</span><span·class="w">
205 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">205 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
206 </span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4250967698-50">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4250967698-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 </span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4903203735-50">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4903203735-50">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4250967698-51">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4250967698-51">)</span><span·class="p">,</span><span·class="w">207 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4903203735-51">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4903203735-51">)</span><span·class="p">,</span><span·class="w">
208 ····</span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4250967698-52">(</span><span·class="n">State</span><span·class="p"·data-group-id="4250967698-52">)</span><span·class="p">.</span><span·class="w">208 ····</span><span·class="nf">del_frag</span><span·class="p"·data-group-id="4903203735-52">(</span><span·class="n">State</span><span·class="p"·data-group-id="4903203735-52">)</span><span·class="p">.</span><span·class="w">
  
209 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">209 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
210 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4250967698-53">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4250967698-53">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Fragnum</span><span·class="w">·</span><span·class="k">when</span><span·class="w">210 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4903203735-53">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4903203735-53">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Fragnum</span><span·class="w">·</span><span·class="k">when</span><span·class="w">
211 ······</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-54">(</span><span·class="p"·data-group-id="4250967698-54">)</span><span·class="p">,</span><span·class="w">211 ······</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-54">(</span><span·class="p"·data-group-id="4903203735-54">)</span><span·class="p">,</span><span·class="w">
212 ······</span><span·class="n">Key</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-55">(</span><span·class="p"·data-group-id="4250967698-55">)</span><span·class="p">,</span><span·class="w">212 ······</span><span·class="n">Key</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-55">(</span><span·class="p"·data-group-id="4903203735-55">)</span><span·class="p">,</span><span·class="w">
213 ······</span><span·class="n">Fragnum</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4250967698-56">(</span><span·class="p"·data-group-id="4250967698-56">)</span><span·class="p">.</span><span·class="w">213 ······</span><span·class="n">Fragnum</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="4903203735-56">(</span><span·class="p"·data-group-id="4903203735-56">)</span><span·class="p">.</span><span·class="w">
214 </span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4250967698-57">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-58">{</span><span·class="ss">function</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">p[·...·truncated·by·diffoscope;·len:·536,·SHA:·a5f2e8e8434a5621fe5cfc1a411e2e6ecd2a143e291b3d1d0be748012c90d1a7·...·]-57">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 </span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4903203735-57">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-58">{</span><span·class="ss">function</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">p[·...·truncated·by·diffoscope;·len:·536,·SHA:·a62a5b46de88307c18db720289acbfb43d926a539900dadd9952fe03eeae072a·...·]-57">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ····</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">phash</span><span·class="p"·data-group-id="4250967698-59">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4250967698-60">(</span><span·class="n">L</span><span·class="w">·</span><span·class="o">+</span><spa[·...·truncated·by·diffoscope;·len:·140,·SHA:·d0e618734d2ba31230a095904fa67b792b319afb6739864b63f5dffb9cf84b36·...·]-59">)</span><span·class="p">,</span><span·class="w">215 ····</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">phash</span><span·class="p"·data-group-id="4903203735-59">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4903203735-60">(</span><span·class="n">L</span><span·class="w">·</span><span·class="o">+</span><spa[·...·truncated·by·diffoscope;·len:·140,·SHA:·b945e908c36e9bc1475ebaa9d2252f197d898e86e07d0311bdf5f65471922ad9·...·]-59">)</span><span·class="p">,</span><span·class="w">
216 ····</span><span·class="k">if</span><span·class="w">216 ····</span><span·class="k">if</span><span·class="w">
217 ········</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">217 ········</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
218 ············</span><span·class="n">A</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4250967698-61">(</span><span·class="n">L</span><span·class="p"·data-group-id="4250967698-61">)</span><span·class="p">;</span><span·class="w">218 ············</span><span·class="n">A</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4903203735-61">(</span><span·class="n">L</span><span·class="p"·data-group-id="4903203735-61">)</span><span·class="p">;</span><span·class="w">
219 ········</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 ········</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ············</span><span·class="n">A</span><span·class="w">220 ············</span><span·class="n">A</span><span·class="w">
221 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">221 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
222 </span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4250967698-62">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-63">{</span><span·class="ss">function</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">p[·...·truncated·by·diffoscope;·len:·537,·SHA:·724e482c30333d429152f9380ecb1e9c8a56956d491f2f7d1a4b36002f1c6272·...·]-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">222 </span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4903203735-62">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-63">{</span><span·class="ss">function</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nb">p[·...·truncated·by·diffoscope;·len:·537,·SHA:·d2788f5fa3ebd08c0c33317c7f39ab3f78397770955461eb7d0c53c5d9d202cb·...·]-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
223 ····</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">phash2</span><span·class="p"·data-group-id="4250967698-64">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4250967698-65">(</span><span·class="n">L</span><span·class="w">·</span><span·class="o">+</span><spa[·...·truncated·by·diffoscope;·len:·140,·SHA:·fc8bbf112e21fd92a89bfc95a8c4ed7badbddc5b0b0309dd66826ea1302b747f·...·]-64">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">223 ····</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">phash2</span><span·class="p"·data-group-id="4903203735-64">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4903203735-65">(</span><span·class="n">L</span><span·class="w">·</span><span·class="o">+</span><spa[·...·truncated·by·diffoscope;·len:·140,·SHA:·8c1e6781b814e9396de8e17fdccb1b93942e5f2456d824b98c933bee4e0d6ca3·...·]-64">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
224 ····</span><span·class="k">if</span><span·class="w">224 ····</span><span·class="k">if</span><span·class="w">
225 ········</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">225 ········</span><span·class="n">A</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
226 ············</span><span·class="n">A</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4250967698-66">(</span><span·class="n">L</span><span·class="p"·data-group-id="4250967698-66">)</span><span·class="p">;</span><span·class="w">226 ············</span><span·class="n">A</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="nf">power2</span><span·class="p"·data-group-id="4903203735-66">(</span><span·class="n">L</span><span·class="p"·data-group-id="4903203735-66">)</span><span·class="p">;</span><span·class="w">
227 ········</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 ········</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ············</span><span·class="n">A</span><span·class="w">228 ············</span><span·class="n">A</span><span·class="w">
229 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">229 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
230 </span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4250967698-67">(</span><span·class="n">OldState</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4250967698-67">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">230 </span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4903203735-67">(</span><span·class="n">OldState</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4903203735-67">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
231 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4250967698-68">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4250967698-68">)</span><span·class="p">,</span><span·class="w">231 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">convert_old_state</span><span·class="p"·data-group-id="4903203735-68">(</span><span·class="n">OldState</span><span·class="p"·data-group-id="4903203735-68">)</span><span·class="p">,</span><span·class="w">
232 ····</span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4250967698-69">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4250967698-69">)</span><span·class="p">.</span><span·class="w">232 ····</span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4903203735-69">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="4903203735-69">)</span><span·class="p">.</span><span·class="w">
  
233 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">233 </span><span·class="c1">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span><span·class="w">
234 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">match_spec_to_frag_numbers</span><span·class="p"·data-group-id="4250967698-70">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MatchSpec</span><span·class="p"·data-group-id="4250967698-70">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Fragnums</span><span·class="w">·</span><span·class="k">when</span><span·class="w">234 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">match_spec_to_frag_numbers</span><span·class="p"·data-group-id="4903203735-70">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MatchSpec</span><span·class="p"·data-group-id="4903203735-70">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Fragnums</span><span·class="w">·</span><span·class="k">when</span><span·class="w">
235 ······</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4250967698-71">(</span><span·class="p"·data-group-id="4250967698-71">)</span><span·class="p">,</span><span·class="w">235 ······</span><span·class="n">State</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4903203735-71">(</span><span·class="p"·data-group-id="4903203735-71">)</span><span·class="p">,</span><span·class="w">
236 ······</span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_spec</span><span·class="p"·data-group-id="4250967698-72">(</span><span·class="p"·data-group-id="4250967698-72">)</span><span·class="p">,</span><span·class="w">236 ······</span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_spec</span><span·class="p"·data-group-id="4903203735-72">(</span><span·class="p"·data-group-id="4903203735-72">)</span><span·class="p">,</span><span·class="w">
237 ······</span><span·class="n">Fragnums</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4250967698-73">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4250967698-74">(</span><span·class="p"·data-group-id="4250967698-74">)</span><span·class="p"·data-group-id="4250967698-73">]</span><span·class="p">.</span><span·class="w">237 ······</span><span·class="n">Fragnums</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4903203735-73">[</span><span·class="nf">integer</span><span·class="p"·data-group-id="4903203735-74">(</span><span·class="p"·data-group-id="4903203735-74">)</span><span·class="p"·data-group-id="4903203735-73">]</span><span·class="p">.</span><span·class="w">
238 </span><span·class="nf">match_spec_to_frag_numbers</span><span·class="p"·data-group-id="4250967698-75">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4250967698-76">{</span><span·class="ss">n_fragments</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n"[·...·truncated·by·diffoscope;·len:·284,·SHA:·11bd1b5cef9413d001e9167eb6bb251aef0d8202a6c7d03609c9220cb6fc9445·...·]-75">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">238 </span><span·class="nf">match_spec_to_frag_numbers</span><span·class="p"·data-group-id="4903203735-75">(</span><span·class="o">#</span><span·class="ss">hash_state</span><span·class="p"·data-group-id="4903203735-76">{</span><span·class="ss">n_fragments</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n"[·...·truncated·by·diffoscope;·len:·284,·SHA:·cf0301704ce26dcec684493881c7a02364f70caafb2d13f2f65836594e6e362f·...·]-75">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
239 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="k">of</span><span·class="w">239 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
240 ········</span><span·class="p"·data-group-id="4250967698-77">[</span><span·class="p"·data-group-id="4250967698-78">{</span><span·class="n">HeadPat</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·[·...·truncated·by·diffoscope;·len:·554,·SHA:·2f0627a4655926eda2532da2893f0a25da544e2260e49d98ad8f1b14e126ba1a·...·]-80">)</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">240 ········</span><span·class="p"·data-group-id="4903203735-77">[</span><span·class="p"·data-group-id="4903203735-78">{</span><span·class="n">HeadPat</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·[·...·truncated·by·diffoscope;·len:·554,·SHA:·d867831ba358c6d212510eacc8b7a0bdfb5453c04b74d89fd43aa74adbb0f248·...·]-80">)</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
241 ············</span><span·class="n">KeyPat</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="4250967698-81">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HeadPat</span><span·class="p"·data-group-id="4250967698-81">)</span><span·class="p">,</span><span·class="w">241 ············</span><span·class="n">KeyPat</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="4903203735-81">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HeadPat</span><span·class="p"·data-group-id="4903203735-81">)</span><span·class="p">,</span><span·class="w">
242 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">has_var</span><span·class="p"·data-group-id="4250967698-82">(</span><span·class="n">KeyPat</span><span·class="p"·data-group-id="4250967698-82">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">242 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">has_var</span><span·class="p"·data-group-id="4903203735-82">(</span><span·class="n">KeyPat</span><span·class="p"·data-group-id="4903203735-82">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
243 ················</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">243 ················</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
244 ····················</span><span·class="p"·data-group-id="4250967698-83">[</span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4250967698-84">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">KeyPat</span><span·class="p"·data-group-id="42[·...·truncated·by·diffoscope;·len:·62,·SHA:·0bfa3791bc4ad4f1096082b4d76133b9070da892510b708536908f60d717bcad·...·]-83">]</span><span·class="p">;</span><span·class="w">244 ····················</span><span·class="p"·data-group-id="4903203735-83">[</span><span·class="nf">key_to_frag_number</span><span·class="p"·data-group-id="4903203735-84">(</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">KeyPat</span><span·class="p"·data-group-id="49[·...·truncated·by·diffoscope;·len:·62,·SHA:·0ec57d966aa6f2628f20655beefeb8d7656fc65787bfd4095dedfd607a09d8c6·...·]-83">]</span><span·class="p">;</span><span·class="w">
245 ················</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">245 ················</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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209 ······<p·class="built-using">209 ······<p·class="built-using">
210 ········Built·using210 ········Built·using
211 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the211 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
212 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>212 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
213 ······</p>213 ······</p>
214 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>214 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
215 ····</footer>215 ····</footer>
216 ··</div>216 ··</div>
217 </main>217 </main>
218 </div>218 </div>
219 <script>219 <script>
220 ··function·mermaidLoaded()·{220 ··function·mermaidLoaded()·{
221 ····mermaid.initialize({221 ····mermaid.initialize({
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133 ··<a·href="#starting-mnesia-for-the-first-time"·class="hover-link">133 ··<a·href="#starting-mnesia-for-the-first-time"·class="hover-link">
134 ····<i·class="ri-link-m"·aria-hidden="true"></i>134 ····<i·class="ri-link-m"·aria-hidden="true"></i>
135 ··</a>135 ··</a>
136 ··<span·class="text">Starting·Mnesia·for·the·First·Time</span>136 ··<span·class="text">Starting·Mnesia·for·the·First·Time</span>
137 </h2>137 </h2>
138 <p>This·section·provides·a·simplified·demonstration·of·a·<code·class="inline">Mnesia</code>·system·startup.138 <p>This·section·provides·a·simplified·demonstration·of·a·<code·class="inline">Mnesia</code>·system·startup.
139 The·dialogue·from·the·Erlang·shell·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-mnesia·dir·&#39;&quot;/tmp/funky&quot;&#39;</span><span·class="w">139 The·dialogue·from·the·Erlang·shell·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-mnesia·dir·&#39;&quot;/tmp/funky&quot;&#39;</span><span·class="w">
140 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.1</span><span·class="p">.</span><span·class="mi">2</span><span·class="p"·data-group-id="1787687182-1">]</span><span·class="w">140 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.1</span><span·class="p">.</span><span·class="mi">2</span><span·class="p"·data-group-id="1771369179-1">]</span><span·class="w">
  
141 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-2">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><span[·...·truncated·by·diffoscope;·len:·397,·SHA:·32f6a4505ef14613c86d956f4804e4c051cd1ac4088ff8321185316ac01342b8·...·]-2">)</span><span·class="gp·unselectable">141 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-2">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><span[·...·truncated·by·diffoscope;·len:·397,·SHA:·83341d5c08b17c813c2fba7c8be3784d2078fefaf015687be42ef3ec1ad002ae·...·]-2">)</span><span·class="gp·unselectable">
142 1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="1787687182-4">(</span><span·class="p"·data-group-id="1787687182-5">[</span><span·class="nf">node</span><span·class="p"·data-group-id="1787687182-6">(</span><span·class="p"·data-group-id="1787687182-6">)</span><span·class="p"·data-group-id="1787687182-5">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·a0975e97218db84df679c0ce99aea4cc14df298543c7e474d7bda4ae66499e74·...·]-4">)</span><span·class="p">.</span><span·class="w">142 1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="1771369179-4">(</span><span·class="p"·data-group-id="1771369179-5">[</span><span·class="nf">node</span><span·class="p"·data-group-id="1771369179-6">(</span><span·class="p"·data-group-id="1771369179-6">)</span><span·class="p"·data-group-id="1771369179-5">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·a43fa32dfb4865901810892541b7a1f1c5458c5392e733c81022dbbb2758a11c·...·]-4">)</span><span·class="p">.</span><span·class="w">
143 </span><span·class="ss">ok</span><span·class="gp·unselectable">143 </span><span·class="ss">ok</span><span·class="gp·unselectable">
144 2&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1787687182-7">(</span><span·class="p"·data-group-id="1787687182-7">)</span><span·class="p">.</span><span·class="w">144 2&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1771369179-7">(</span><span·class="p"·data-group-id="1771369179-7">)</span><span·class="p">.</span><span·class="w">
145 </span><span·class="ss">ok</span><span·class="gp·unselectable">145 </span><span·class="ss">ok</span><span·class="gp·unselectable">
146 3&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1787687182-8">(</span><span·class="ss">funky</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-9">[</span><span·class="p"·data-group-id="1787687182-9">]</span><span·class="p"·data-group-id="1787687182-8">)</span><span·class="p">.</span><span·class="w">146 3&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1771369179-8">(</span><span·class="ss">funky</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-9">[</span><span·class="p"·data-group-id="1771369179-9">]</span><span·class="p"·data-group-id="1771369179-8">)</span><span·class="p">.</span><span·class="w">
147 </span><span·class="p"·data-group-id="1787687182-10">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="1787687182-10">}</span><span·class="gp·unselectable">147 </span><span·class="p"·data-group-id="1771369179-10">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="1771369179-10">}</span><span·class="gp·unselectable">
148 4&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="1787687182-11">(</span><span·class="p"·data-group-id="1787687182-11">)</span><span·class="p">.</span><span·class="w">148 4&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="1771369179-11">(</span><span·class="p"·data-group-id="1771369179-11">)</span><span·class="p">.</span><span·class="w">
149 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Processes</span><span·class="w">·</span><span·class="ss">holding</span><span·class="w">·</span><span·class="ss">locks</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·149 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Processes</span><span·class="w">·</span><span·class="ss">holding</span><span·class="w">·</span><span·class="ss">locks</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·
150 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Processes</span><span·class="w">·</span><span·class="ss">waiting</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">locks</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·150 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Processes</span><span·class="w">·</span><span·class="ss">waiting</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">locks</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·
151 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Participant</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·151 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Participant</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·
152 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Coordinator</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">152 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Coordinator</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">
153 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Uncertain</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·153 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Uncertain</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·
154 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Active</span><span·class="w">·</span><span·class="ss">tables</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·154 </span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Active</span><span·class="w">·</span><span·class="ss">tables</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="o">--</span><span·class="w">·
155 </span><span·class="ss">funky</span><span·class="w">··········</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">········</span><span·class="ss">records</span><span·class="w">·</span><span·class="ss">occupying</span><span·class="w">·</span><span·class="mi">305</span><span·class="w">······</span><span·class="ss">words</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">mem</span><span·class="w">155 </span><span·class="ss">funky</span><span·class="w">··········</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">········</span><span·class="ss">records</span><span·class="w">·</span><span·class="ss">occupying</span><span·class="w">·</span><span·class="mi">305</span><span·class="w">······</span><span·class="ss">words</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">mem</span><span·class="w">
156 </span><span·class="ss">schema</span><span·class="w">·········</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">········</span><span·class="ss">records</span><span·class="w">·</span><span·class="ss">occupying</span><span·class="w">·</span><span·class="mi">533</span><span·class="w">······</span><span·class="ss">words</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">mem</span><span·class="w">156 </span><span·class="ss">schema</span><span·class="w">·········</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">········</span><span·class="ss">records</span><span·class="w">·</span><span·class="ss">occupying</span><span·class="w">·</span><span·class="mi">533</span><span·class="w">······</span><span·class="ss">words</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">mem</span><span·class="w">
157 </span><span·class="o">==</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">System</span><span·class="w">·</span><span·class="ss">info</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="s">&quot;4.23.2&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug</span><span·class="w">·</span><span·class="ss">level</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">none</span><span·class="w">·</span><span·class="o">&lt;=</span><span·class="o">==</span><span·class="w">157 </span><span·class="o">==</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">System</span><span·class="w">·</span><span·class="ss">info</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="s">&quot;4.23.2&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug</span><span·class="w">·</span><span·class="ss">level</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">none</span><span·class="w">·</span><span·class="o">&lt;=</span><span·class="o">==</span><span·class="w">
158 </span><span·class="ss">opt_disc</span><span·class="p">.</span><span·class="w">·</span><span·class="n">Directory</span><span·class="w">·</span><span·class="s">&quot;/tmp/funky&quot;</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">used</span><span·class="p">.</span><span·class="w">158 </span><span·class="ss">opt_disc</span><span·class="p">.</span><span·class="w">·</span><span·class="n">Directory</span><span·class="w">·</span><span·class="s">&quot;/tmp/funky&quot;</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">used</span><span·class="p">.</span><span·class="w">
159 </span><span·class="ss">use</span><span·class="w">·</span><span·class="ss">fallback</span><span·class="w">·</span><span·class="ss">at</span><span·class="w">·</span><span·class="ss">restart</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">159 </span><span·class="ss">use</span><span·class="w">·</span><span·class="ss">fallback</span><span·class="w">·</span><span·class="ss">at</span><span·class="w">·</span><span·class="ss">restart</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">
160 </span><span·class="ss">running</span><span·class="w">·</span><span·class="ss">db</span><span·class="w">·</span><span·class="nb">nodes</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-12">[</span><span·class="ss">nonode@nohost</span><span·class="p"·data-group-id="1787687182-12">]</span><span·class="w">160 </span><span·class="ss">running</span><span·class="w">·</span><span·class="ss">db</span><span·class="w">·</span><span·class="nb">nodes</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-12">[</span><span·class="ss">nonode@nohost</span><span·class="p"·data-group-id="1771369179-12">]</span><span·class="w">
161 </span><span·class="ss">stopped</span><span·class="w">·</span><span·class="ss">db</span><span·class="w">·</span><span·class="nb">nodes</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-13">[</span><span·class="p"·data-group-id="1787687182-13">]</span><span·class="w">161 </span><span·class="ss">stopped</span><span·class="w">·</span><span·class="ss">db</span><span·class="w">·</span><span·class="nb">nodes</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-13">[</span><span·class="p"·data-group-id="1771369179-13">]</span><span·class="w">
162 </span><span·class="ss">master</span><span·class="w">·</span><span·class="nb">node</span><span·class="w">·</span><span·class="ss">tables</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-14">[</span><span·class="p"·data-group-id="1787687182-14">]</span><span·class="w">162 </span><span·class="ss">master</span><span·class="w">·</span><span·class="nb">node</span><span·class="w">·</span><span·class="ss">tables</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-14">[</span><span·class="p"·data-group-id="1771369179-14">]</span><span·class="w">
163 </span><span·class="ss">remote</span><span·class="w">·············</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-15">[</span><span·class="p"·data-group-id="1787687182-15">]</span><span·class="w">163 </span><span·class="ss">remote</span><span·class="w">·············</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-15">[</span><span·class="p"·data-group-id="1771369179-15">]</span><span·class="w">
164 </span><span·class="ss">ram_copies</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-16">[</span><span·class="ss">funky</span><span·class="p"·data-group-id="1787687182-16">]</span><span·class="w">164 </span><span·class="ss">ram_copies</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-16">[</span><span·class="ss">funky</span><span·class="p"·data-group-id="1771369179-16">]</span><span·class="w">
165 </span><span·class="ss">disc_copies</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-17">[</span><span·class="ss">schema</span><span·class="p"·data-group-id="1787687182-17">]</span><span·class="w">165 </span><span·class="ss">disc_copies</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-17">[</span><span·class="ss">schema</span><span·class="p"·data-group-id="1771369179-17">]</span><span·class="w">
166 </span><span·class="ss">disc_only_copies</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-18">[</span><span·class="p"·data-group-id="1787687182-18">]</span><span·class="w">166 </span><span·class="ss">disc_only_copies</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-18">[</span><span·class="p"·data-group-id="1771369179-18">]</span><span·class="w">
167 </span><span·class="p"·data-group-id="1787687182-19">[</span><span·class="p"·data-group-id="1787687182-20">{</span><span·class="ss">nonode@nohost</span><span·class="p">,</span><span·class="ss">disc_copies</span><span·class="p"·data-group-id="1787687182-20">}</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·220,·SHA:·f9d0054738558223f0000681269ce2eb571b7df3658396f3cdcd1a1cd6145b99·...·]-21">]</span><span·class="w">167 </span><span·class="p"·data-group-id="1771369179-19">[</span><span·class="p"·data-group-id="1771369179-20">{</span><span·class="ss">nonode@nohost</span><span·class="p">,</span><span·class="ss">disc_copies</span><span·class="p"·data-group-id="1771369179-20">}</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·220,·SHA:·38a8576b1d45b3348e8060d88a987c9c817ebab12a1ad63047173cf0a35f10aa·...·]-21">]</span><span·class="w">
168 </span><span·class="p"·data-group-id="1787687182-22">[</span><span·class="p"·data-group-id="1787687182-23">{</span><span·class="ss">nonode@nohost</span><span·class="p">,</span><span·class="ss">ram_copies</span><span·class="p"·data-group-id="1787687182-23">}</span><span·class="p"·data-group-id="1[·...·truncated·by·diffoscope;·len:·218,·SHA:·6ffe90535d6207b0f51c6fc6db5342517b13e904813db77c72eddff64b7736fc·...·]-24">]</span><span·class="w">168 </span><span·class="p"·data-group-id="1771369179-22">[</span><span·class="p"·data-group-id="1771369179-23">{</span><span·class="ss">nonode@nohost</span><span·class="p">,</span><span·class="ss">ram_copies</span><span·class="p"·data-group-id="1771369179-23">}</span><span·class="p"·data-group-id="1[·...·truncated·by·diffoscope;·len:·218,·SHA:·75f046b31151648b13a81b6ead3c21caed6b952abbf7f676a21d4edab65bfb16·...·]-24">]</span><span·class="w">
169 </span><span·class="mi">3</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="ss">committed</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">aborted</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">restarted</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="ss">logged</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">disc</span><span·class="w">169 </span><span·class="mi">3</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="ss">committed</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">aborted</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">restarted</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="ss">logged</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">disc</span><span·class="w">
170 </span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">held</span><span·class="w">·</span><span·class="ss">locks</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">queue</span><span·class="p">;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">local</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">remote</span><span·class="w">170 </span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">held</span><span·class="w">·</span><span·class="ss">locks</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">queue</span><span·class="p">;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">local</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">remote</span><span·class="w">
171 </span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="ss">waits</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">other</span><span·class="w">·</span><span·class="nc">nodes</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1787687182-25">[</span><span·class="p"·data-group-id="1787687182-25">]</span><span·class="w">171 </span><span·class="mi">0</span><span·class="w">·</span><span·class="ss">transactions</span><span·class="w">·</span><span·class="ss">waits</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">other</span><span·class="w">·</span><span·class="nc">nodes</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1771369179-25">[</span><span·class="p"·data-group-id="1771369179-25">]</span><span·class="w">
172 </span><span·class="ss">ok</span></code></pre><p>In·this·example,·the·following·actions·are·performed:</p><ul><li><em>Step·1:</em>·The·Erlang·system·is·started·from·the·UNIX·prompt·with·a·flag172 </span><span·class="ss">ok</span></code></pre><p>In·this·example,·the·following·actions·are·performed:</p><ul><li><em>Step·1:</em>·The·Erlang·system·is·started·from·the·UNIX·prompt·with·a·flag
173 <code·class="inline">-mnesia·dir·'&quot;/tmp/funky&quot;'</code>,·which·indicates·in·which·directory·to·store·the173 <code·class="inline">-mnesia·dir·'&quot;/tmp/funky&quot;'</code>,·which·indicates·in·which·directory·to·store·the
174 data.</li><li><em>Step·2:</em>·A·new·empty·schema·is·initialized·on·the·local·node·by·evaluating174 data.</li><li><em>Step·2:</em>·A·new·empty·schema·is·initialized·on·the·local·node·by·evaluating
175 <a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema([node()])</code></a>.·The·schema175 <a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema([node()])</code></a>.·The·schema
176 contains·information·about·the·database·in·general.·This·is·explained·in176 contains·information·about·the·database·in·general.·This·is·explained·in
177 detail·later.</li><li><em>Step·3:</em>·The·DBMS·is·started·by·evaluating177 detail·later.</li><li><em>Step·3:</em>·The·DBMS·is·started·by·evaluating
178 <a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>.</li><li><em>Step·4:</em>·A·first·table·is·created,·called·<code·class="inline">funky</code>,·by·evaluating·the178 <a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>.</li><li><em>Step·4:</em>·A·first·table·is·created,·called·<code·class="inline">funky</code>,·by·evaluating·the
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225 relationship.</li></ol></li></ul><h3·id="defining-structure-and-content"·class="section-heading">225 relationship.</li></ol></li></ul><h3·id="defining-structure-and-content"·class="section-heading">
226 ··<a·href="#defining-structure-and-content"·class="hover-link">226 ··<a·href="#defining-structure-and-content"·class="hover-link">
227 ····<i·class="ri-link-m"·aria-hidden="true"></i>227 ····<i·class="ri-link-m"·aria-hidden="true"></i>
228 ··</a>228 ··</a>
229 ··<span·class="text">Defining·Structure·and·Content</span>229 ··<span·class="text">Defining·Structure·and·Content</span>
230 </h3>230 </h3>
231 <p>First·the·record·definitions·are·entered·into·a·text·file·named·<code·class="inline">company.hrl</code>.231 <p>First·the·record·definitions·are·entered·into·a·text·file·named·<code·class="inline">company.hrl</code>.
232 This·file·defines·the·following·structure·for·the·example·database:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7528226522-1">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7528226522-2">{</span><span·class="ss">emp_no</span><span·class="p">,</span><span·class="w">232 This·file·defines·the·following·structure·for·the·example·database:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5081083857-1">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5081083857-2">{</span><span·class="ss">emp_no</span><span·class="p">,</span><span·class="w">
233 ···················</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">233 ···················</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">
234 ···················</span><span·class="ss">salary</span><span·class="p">,</span><span·class="w">234 ···················</span><span·class="ss">salary</span><span·class="p">,</span><span·class="w">
235 ···················</span><span·class="ss">sex</span><span·class="p">,</span><span·class="w">235 ···················</span><span·class="ss">sex</span><span·class="p">,</span><span·class="w">
236 ···················</span><span·class="ss">phone</span><span·class="p">,</span><span·class="w">236 ···················</span><span·class="ss">phone</span><span·class="p">,</span><span·class="w">
237 ···················</span><span·class="ss">room_no</span><span·class="p"·data-group-id="7528226522-2">}</span><span·class="p"·data-group-id="7528226522-1">)</span><span·class="p">.</span><span·class="w">237 ···················</span><span·class="ss">room_no</span><span·class="p"·data-group-id="5081083857-2">}</span><span·class="p"·data-group-id="5081083857-1">)</span><span·class="p">.</span><span·class="w">
238 </span><span·class="w">238 </span><span·class="w">
239 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7528226522-3">(</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7528226522-4">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="w">239 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5081083857-3">(</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5081083857-4">{</span><span·class="ss">id</span><span·class="p">,</span><span·class="w">
240 ···············</span><span·class="ss">name</span><span·class="p"·data-group-id="7528226522-4">}</span><span·class="p"·data-group-id="7528226522-3">)</span><span·class="p">.</span><span·class="w">240 ···············</span><span·class="ss">name</span><span·class="p"·data-group-id="5081083857-4">}</span><span·class="p"·data-group-id="5081083857-3">)</span><span·class="p">.</span><span·class="w">
241 </span><span·class="w">241 </span><span·class="w">
242 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7528226522-5">(</span><span·class="ss">project</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7528226522-6">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">242 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5081083857-5">(</span><span·class="ss">project</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5081083857-6">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">
243 ··················</span><span·class="ss">number</span><span·class="p"·data-group-id="7528226522-6">}</span><span·class="p"·data-group-id="7528226522-5">)</span><span·class="p">.</span><span·class="w">243 ··················</span><span·class="ss">number</span><span·class="p"·data-group-id="5081083857-6">}</span><span·class="p"·data-group-id="5081083857-5">)</span><span·class="p">.</span><span·class="w">
244 </span><span·class="w">244 </span><span·class="w">
  
245 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7528226522-7">(</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7528226522-8">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">245 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5081083857-7">(</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5081083857-8">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">
246 ··················</span><span·class="ss">dept</span><span·class="p"·data-group-id="7528226522-8">}</span><span·class="p"·data-group-id="7528226522-7">)</span><span·class="p">.</span><span·class="w">246 ··················</span><span·class="ss">dept</span><span·class="p"·data-group-id="5081083857-8">}</span><span·class="p"·data-group-id="5081083857-7">)</span><span·class="p">.</span><span·class="w">
247 </span><span·class="w">247 </span><span·class="w">
248 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7528226522-9">(</span><span·class="ss">at_dep</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7528226522-10">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">248 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5081083857-9">(</span><span·class="ss">at_dep</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5081083857-10">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">
249 ·················</span><span·class="ss">dept_id</span><span·class="p"·data-group-id="7528226522-10">}</span><span·class="p"·data-group-id="7528226522-9">)</span><span·class="p">.</span><span·class="w">249 ·················</span><span·class="ss">dept_id</span><span·class="p"·data-group-id="5081083857-10">}</span><span·class="p"·data-group-id="5081083857-9">)</span><span·class="p">.</span><span·class="w">
250 </span><span·class="w">250 </span><span·class="w">
251 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7528226522-11">(</span><span·class="ss">in_proj</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7528226522-12">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">251 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="5081083857-11">(</span><span·class="ss">in_proj</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5081083857-12">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">
252 ··················</span><span·class="ss">proj_name</span><span·class="p"·data-group-id="7528226522-12">}</span><span·class="p"·data-group-id="7528226522-11">)</span><span·class="p">.</span></code></pre><p>The·structure·defines·six·tables·in·the·database.·In·<code·class="inline">Mnesia</code>,·the·function252 ··················</span><span·class="ss">proj_name</span><span·class="p"·data-group-id="5081083857-12">}</span><span·class="p"·data-group-id="5081083857-11">)</span><span·class="p">.</span></code></pre><p>The·structure·defines·six·tables·in·the·database.·In·<code·class="inline">Mnesia</code>,·the·function
253 <a·href="mnesia.html#create_table/2"><code·class="inline">mnesia:create_table(Name,·Opts)</code></a>·creates·tables.253 <a·href="mnesia.html#create_table/2"><code·class="inline">mnesia:create_table(Name,·Opts)</code></a>·creates·tables.
254 <code·class="inline">Name</code>·is·the·table·name.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·current·version·of·<code·class="inline">Mnesia</code>·does·not·require·that·the·name·of·the·table·is254 <code·class="inline">Name</code>·is·the·table·name.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·current·version·of·<code·class="inline">Mnesia</code>·does·not·require·that·the·name·of·the·table·is
255 the·same·as·the·record·name,·see255 the·same·as·the·record·name,·see
256 <a·href="mnesia_chap4.html#recordnames_tablenames">Record·Names·versus·Table·Names.</a>.</p></section><p>For·example,·the·table·for·employees·is·created·with·the·function256 <a·href="mnesia_chap4.html#recordnames_tablenames">Record·Names·versus·Table·Names.</a>.</p></section><p>For·example,·the·table·for·employees·is·created·with·the·function
257 <code·class="inline">mnesia:create_table(employee,·[{attributes,·record_info(fields,·employee)}])</code>.257 <code·class="inline">mnesia:create_table(employee,·[{attributes,·record_info(fields,·employee)}])</code>.
258 The·table·name·<code·class="inline">employee</code>·matches·the·name·for·records·specified·in·<code·class="inline">Opts</code>.258 The·table·name·<code·class="inline">employee</code>·matches·the·name·for·records·specified·in·<code·class="inline">Opts</code>.
259 The·expression·<code·class="inline">record_info(fields,·RecordName)</code>·is·processed·by·the·Erlang259 The·expression·<code·class="inline">record_info(fields,·RecordName)</code>·is·processed·by·the·Erlang
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263 ··<a·href="#program"·class="hover-link">263 ··<a·href="#program"·class="hover-link">
264 ····<i·class="ri-link-m"·aria-hidden="true"></i>264 ····<i·class="ri-link-m"·aria-hidden="true"></i>
265 ··</a>265 ··</a>
266 ··<span·class="text">Program</span>266 ··<span·class="text">Program</span>
267 </h3>267 </h3>
268 <p>The·following·shell·interaction·starts·<code·class="inline">Mnesia</code>·and·initializes·the·schema·for268 <p>The·following·shell·interaction·starts·<code·class="inline">Mnesia</code>·and·initializes·the·schema·for
269 the·<code·class="inline">Company</code>·database:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-mnesia·dir·&#39;&quot;/ldisc/scratch/Mnesia.Company&quot;&#39;</span><span·class="w">269 the·<code·class="inline">Company</code>·database:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·erl·-mnesia·dir·&#39;&quot;/ldisc/scratch/Mnesia.Company&quot;&#39;</span><span·class="w">
270 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="6539464477-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.1</span><span·class="p">.</span><span·class="mi">2</span><span·class="p"·data-group-id="6539464477-1">]</span><span·class="w">270 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="1035343912-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.1</span><span·class="p">.</span><span·class="mi">2</span><span·class="p"·data-group-id="1035343912-1">]</span><span·class="w">
  
271 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="6539464477-2">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·bcb62e00c6a5a08086cd71b6cbcfafb6399bad2291d97bf2a3f82c73a86a31e7·...·]-2">)</span><span·class="gp·unselectable">271 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="1035343912-2">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·73731a6e639338e0fd8daf0fd6cb37a3b9685d6e422f315c00c3e2229bf1f6ed·...·]-2">)</span><span·class="gp·unselectable">
272 1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="6539464477-4">(</span><span·class="p"·data-group-id="6539464477-5">[</span><span·class="nf">node</span><span·class="p"·data-group-id="6539464477-6">(</span><span·class="p"·data-group-id="6539464477-6">)</span><span·class="p"·data-group-id="6539464477-5">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·72ad51668bd6e8da1aa3db9b5451c0efffaff28acf63d1727132507b7ef7bdb0·...·]-4">)</span><span·class="p">.</span><span·class="w">272 1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="1035343912-4">(</span><span·class="p"·data-group-id="1035343912-5">[</span><span·class="nf">node</span><span·class="p"·data-group-id="1035343912-6">(</span><span·class="p"·data-group-id="1035343912-6">)</span><span·class="p"·data-group-id="1035343912-5">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·e1efb80652018f6b185c89f952732ad3ba2da4d08f41fc87ca13e40f13d6974d·...·]-4">)</span><span·class="p">.</span><span·class="w">
273 </span><span·class="ss">ok</span><span·class="gp·unselectable">273 </span><span·class="ss">ok</span><span·class="gp·unselectable">
274 2&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6539464477-7">(</span><span·class="p"·data-group-id="6539464477-7">)</span><span·class="p">.</span><span·class="w">274 2&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1035343912-7">(</span><span·class="p"·data-group-id="1035343912-7">)</span><span·class="p">.</span><span·class="w">
275 </span><span·class="ss">ok</span></code></pre><p>The·following·program·module·creates·and·populates·previously·defined·tables:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="2311768343-1">(</span><span·class="s">&quot;stdlib/include/qlc.hrl&quot;</span><span·class="p"·data-group-id="2311768343-1">)</span><span·class="p">.</span><span·class="w">275 </span><span·class="ss">ok</span></code></pre><p>The·following·program·module·creates·and·populates·previously·defined·tables:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7187856007-1">(</span><span·class="s">&quot;stdlib/include/qlc.hrl&quot;</span><span·class="p"·data-group-id="7187856007-1">)</span><span·class="p">.</span><span·class="w">
276 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="2311768343-2">(</span><span·class="s">&quot;company.hrl&quot;</span><span·class="p"·data-group-id="2311768343-2">)</span><span·class="p">.</span><span·class="w">276 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="7187856007-2">(</span><span·class="s">&quot;company.hrl&quot;</span><span·class="p"·data-group-id="7187856007-2">)</span><span·class="p">.</span><span·class="w">
  
277 </span><span·class="nf">init</span><span·class="p"·data-group-id="2311768343-3">(</span><span·class="p"·data-group-id="2311768343-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">277 </span><span·class="nf">init</span><span·class="p"·data-group-id="7187856007-3">(</span><span·class="p"·data-group-id="7187856007-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
278 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2311768343-4">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">278 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7187856007-4">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">
279 ························</span><span·class="p"·data-group-id="2311768343-5">[</span><span·class="p"·data-group-id="2311768343-6">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2311768343-7">(</span><span·class[·...·truncated·by·diffoscope;·len:·299,·SHA:·b34bbbcdbf181477cb9cde67c9f0e6f791b1bae31d161fc5640c48206ef7d38b·...·]-4">)</span><span·class="p">,</span><span·class="w">279 ························</span><span·class="p"·data-group-id="7187856007-5">[</span><span·class="p"·data-group-id="7187856007-6">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7187856007-7">(</span><span·class[·...·truncated·by·diffoscope;·len:·299,·SHA:·26359bdfcaa9efb9ea1d7716f06cd80ce3a7c14bfb3fface5b2ad3df20a9404c·...·]-4">)</span><span·class="p">,</span><span·class="w">
280 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2311768343-8">(</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">280 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7187856007-8">(</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">
281 ························</span><span·class="p"·data-group-id="2311768343-9">[</span><span·class="p"·data-group-id="2311768343-10">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2311768343-11">(</span><span·cla[·...·truncated·by·diffoscope;·len:·299,·SHA:·23132f1f668ee5b58148ad299697c96b406988973729ba1ea5926f875a351c6b·...·]-8">)</span><span·class="p">,</span><span·class="w">281 ························</span><span·class="p"·data-group-id="7187856007-9">[</span><span·class="p"·data-group-id="7187856007-10">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7187856007-11">(</span><span·cla[·...·truncated·by·diffoscope;·len:·299,·SHA:·3ff875ae9b0af2703dcfaa0cb33c2be0454edc81cbdc9f09841cd4f57fdb3cf3·...·]-8">)</span><span·class="p">,</span><span·class="w">
282 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2311768343-12">(</span><span·class="ss">project</span><span·class="p">,</span><span·class="w">282 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7187856007-12">(</span><span·class="ss">project</span><span·class="p">,</span><span·class="w">
283 ························</span><span·class="p"·data-group-id="2311768343-13">[</span><span·class="p"·data-group-id="2311768343-14">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2311768343-15">(</span><span·cl[·...·truncated·by·diffoscope;·len:·304,·SHA:·f1fd5fc923bebca879fbd6a3713f607836ab629a1bfe11cba15e7da427d52d05·...·]-12">)</span><span·class="p">,</span><span·class="w">283 ························</span><span·class="p"·data-group-id="7187856007-13">[</span><span·class="p"·data-group-id="7187856007-14">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7187856007-15">(</span><span·cl[·...·truncated·by·diffoscope;·len:·304,·SHA:·0ecde00553991fd4e4620551250ff409269d843aaea84e562ddfda1b0070fe6b·...·]-12">)</span><span·class="p">,</span><span·class="w">
284 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2311768343-16">(</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2311768343-17">[</span><span·class="p"·data-group-id="2311768343-18">{</span><span·class="ss">type</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·98,·SHA:·a6f6d150acdd4939d33cd805ed20cc2c61a8a248b8fc804d72b79b325acafdf5·...·]-18">}</span><span·class="p">,</span><span·class="w">284 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7187856007-16">(</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7187856007-17">[</span><span·class="p"·data-group-id="7187856007-18">{</span><span·class="ss">type</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·98,·SHA:·4a7e1ab0cceda3d5faed5a59cbcb2a0bb2fbf3c4a7e4debd357788b6b9a9d355·...·]-18">}</span><span·class="p">,</span><span·class="w">
285 ··································</span><span·class="p"·data-group-id="2311768343-19">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2311768343-20">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·e684cfcf3d882996fe19cd9cb5056501dc5b6c0187456b837b503de7522b5dbc·...·]-16">)</span><span·class="p">,</span><span·class="w">285 ··································</span><span·class="p"·data-group-id="7187856007-19">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7187856007-20">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·0cee00098dbf32e58fd0b97f2633c57045aa58c533fa2d64241689152aace292·...·]-16">)</span><span·class="p">,</span><span·class="w">
286 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2311768343-21">(</span><span·class="ss">at_dep</span><span·class="p">,</span><span·class="w">286 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7187856007-21">(</span><span·class="ss">at_dep</span><span·class="p">,</span><span·class="w">
287 ·························</span><span·class="p"·data-group-id="2311768343-22">[</span><span·class="p"·data-group-id="2311768343-23">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2311768343-24">(</span><span·cl[·...·truncated·by·diffoscope;·len:·303,·SHA:·fd4defbcd1f621f1f69d09e3039972119a9e52ac1ea64e3955eacc4e2db11e50·...·]-21">)</span><span·class="p">,</span><span·class="w">287 ·························</span><span·class="p"·data-group-id="7187856007-22">[</span><span·class="p"·data-group-id="7187856007-23">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7187856007-24">(</span><span·cl[·...·truncated·by·diffoscope;·len:·303,·SHA:·6612a3f05c7c60f4e8f0f3bea75dd99816fc3a6e99b5a0e5c5eb7443e22ec8cd·...·]-21">)</span><span·class="p">,</span><span·class="w">
288 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2311768343-25">(</span><span·class="ss">in_proj</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2311768343-26">[</span><span·class="p"·data-group-id="2311768343-27">{</span><span·class="ss">type</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·98,·SHA:·a6f6d150acdd4939d33cd805ed20cc2c61a8a248b8fc804d72b79b325acafdf5·...·]-27">}</span><span·class="p">,</span><span·class="w">288 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7187856007-25">(</span><span·class="ss">in_proj</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7187856007-26">[</span><span·class="p"·data-group-id="7187856007-27">{</span><span·class="ss">type</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·98,·SHA:·4a7e1ab0cceda3d5faed5a59cbcb2a0bb2fbf3c4a7e4debd357788b6b9a9d355·...·]-27">}</span><span·class="p">,</span><span·class="w">
289 ··································</span><span·class="p"·data-group-id="2311768343-28">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2311768343-29">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·ddb6963795884d73e40e3f8b77be047c0d2383988113eb349c02f05246ced92d·...·]-25">)</span><span·class="p">.</span></code></pre><h3·id="program-explained"·class="section-heading">289 ··································</span><span·class="p"·data-group-id="7187856007-28">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7187856007-29">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·b89fd31608dced1defb9f4085b2587b351eadb1f956aa295d38f5ca19758ba99·...·]-25">)</span><span·class="p">.</span></code></pre><h3·id="program-explained"·class="section-heading">
290 ··<a·href="#program-explained"·class="hover-link">290 ··<a·href="#program-explained"·class="hover-link">
291 ····<i·class="ri-link-m"·aria-hidden="true"></i>291 ····<i·class="ri-link-m"·aria-hidden="true"></i>
292 ··</a>292 ··</a>
293 ··<span·class="text">Program·Explained</span>293 ··<span·class="text">Program·Explained</span>
294 </h3>294 </h3>
295 <p>The·following·commands·and·functions·are·used·to·initiate·the·<code·class="inline">Company</code>295 <p>The·following·commands·and·functions·are·used·to·initiate·the·<code·class="inline">Company</code>
296 database:</p><ul><li><code·class="inline">%·erl·-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.Company&quot;'</code>.·This·is·a·UNIX296 database:</p><ul><li><code·class="inline">%·erl·-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.Company&quot;'</code>.·This·is·a·UNIX
297 command-line·entry·that·starts·the·Erlang·system.·The·flag·<code·class="inline">-mnesia·dir·Dir</code>297 command-line·entry·that·starts·the·Erlang·system.·The·flag·<code·class="inline">-mnesia·dir·Dir</code>
298 specifies·the·location·of·the·database·directory.·The·system·responds·and298 specifies·the·location·of·the·database·directory.·The·system·responds·and
299 waits·for·further·input·with·the·prompt·<code·class="inline">1&gt;</code>.</li><li><a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema([node()])</code></a>.·This·function·has299 waits·for·further·input·with·the·prompt·<code·class="inline">1&gt;</code>.</li><li><a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema([node()])</code></a>.·This·function·has
300 the·format·<code·class="inline">mnesia:create_schema(DiscNodeList)</code>·and·initiates·a·new·schema.·In300 the·format·<code·class="inline">mnesia:create_schema(DiscNodeList)</code>·and·initiates·a·new·schema.·In
301 this·example,·a·non-distributed·system·using·only·one·node·is·created.·Schemas301 this·example,·a·non-distributed·system·using·only·one·node·is·created.·Schemas
302 are·fully·explained·in·<a·href="mnesia_chap3.html#def_schema">Define·a·Schema</a>.</li><li><a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>.·This·function·starts·<code·class="inline">Mnesia</code>·and·is·fully302 are·fully·explained·in·<a·href="mnesia_chap3.html#def_schema">Define·a·Schema</a>.</li><li><a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>.·This·function·starts·<code·class="inline">Mnesia</code>·and·is·fully
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171 there·as·well.·This·action·extends·the·set·of·nodes·that·comprise·this171 there·as·well.·This·action·extends·the·set·of·nodes·that·comprise·this
172 particular·<code·class="inline">Mnesia</code>·system.</p></li><li><p><a·href="mnesia.html#del_table_copy/2"><code·class="inline">mnesia:del_table_copy(Tab,·Node)</code></a>·deletes·the172 particular·<code·class="inline">Mnesia</code>·system.</p></li><li><p><a·href="mnesia.html#del_table_copy/2"><code·class="inline">mnesia:del_table_copy(Tab,·Node)</code></a>·deletes·the
173 replica·of·table·<code·class="inline">Tab</code>·at·node·<code·class="inline">Node</code>.·When·the·last·replica·of·a·table·is173 replica·of·table·<code·class="inline">Tab</code>·at·node·<code·class="inline">Node</code>.·When·the·last·replica·of·a·table·is
174 removed,·the·table·is·deleted.</p></li><li><p><a·href="mnesia.html#transform_table/4"><code·class="inline">mnesia:transform_table(Tab,·Fun,·NewAttributeList,·NewRecordName)</code></a>174 removed,·the·table·is·deleted.</p></li><li><p><a·href="mnesia.html#transform_table/4"><code·class="inline">mnesia:transform_table(Tab,·Fun,·NewAttributeList,·NewRecordName)</code></a>
175 changes·the·format·on·all·records·in·table·<code·class="inline">Tab</code>.·It·applies·argument·<code·class="inline">Fun</code>·to175 changes·the·format·on·all·records·in·table·<code·class="inline">Tab</code>.·It·applies·argument·<code·class="inline">Fun</code>·to
176 all·records·in·the·table.·<code·class="inline">Fun</code>·must·be·a·function·that·takes·a·record·of·the176 all·records·in·the·table.·<code·class="inline">Fun</code>·must·be·a·function·that·takes·a·record·of·the
177 old·type,·and·returns·the·record·of·the·new·type.·The·table·key·must·not·be177 old·type,·and·returns·the·record·of·the·new·type.·The·table·key·must·not·be
178 changed.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="6256739158-1">(</span><span·class="ss">old</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6256739158-2">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">val</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·de8e012f7b125066ea137f8ee25c20b9b45a0bc3141e9ecd2115805356efe21a·...·]-1">)</span><span·class="p">.</span><span·class="w">178 changed.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1426282091-1">(</span><span·class="ss">old</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1426282091-2">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">val</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·66b25afb04c8d25934d8a1e9d1cb55446cbc713b47647fcf169ab3614dcd171c·...·]-1">)</span><span·class="p">.</span><span·class="w">
179 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="6256739158-3">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6256739158-4">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">val</span><spa[·...·truncated·by·diffoscope;·len:·167,·SHA:·34c5f871b432cc66c94fce3350747aefa24bf450a3330ff79c901beddff4d322·...·]-3">)</span><span·class="p">.</span><span·class="w">179 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="1426282091-3">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1426282091-4">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">val</span><spa[·...·truncated·by·diffoscope;·len:·167,·SHA:·7d73423c71923caf73187d4ea33ca8f5e021ec28317dcddd0eeaf9d26cfa61d3·...·]-3">)</span><span·class="p">.</span><span·class="w">
  
180 </span><span·class="n">Transformer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">180 </span><span·class="n">Transformer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
181 ···</span><span·class="nf">fun</span><span·class="p"·data-group-id="6256739158-5">(</span><span·class="n">X</span><span·class="p"·data-group-id="6256739158-5">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">record</span><span·class="p"·data-group-id="6256739158-6">(</span[·...·truncated·by·diffoscope;·len:·141,·SHA:·ef8de718cc065dca34dcb6c19e4382ad27ad7b685292c5694c7ae3354e0c7d6e·...·]-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">181 ···</span><span·class="nf">fun</span><span·class="p"·data-group-id="1426282091-5">(</span><span·class="n">X</span><span·class="p"·data-group-id="1426282091-5">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">record</span><span·class="p"·data-group-id="1426282091-6">(</span[·...·truncated·by·diffoscope;·len:·141,·SHA:·685f245b15e357582985c2864d3777324b2082e0433a8528a481412c19cbe7a2·...·]-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
182 ······</span><span·class="o">#</span><span·class="ss">new</span><span·class="p"·data-group-id="6256739158-7">{</span><span·class="ss">key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">old</span><span·class="p">.</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">182 ······</span><span·class="o">#</span><span·class="ss">new</span><span·class="p"·data-group-id="1426282091-7">{</span><span·class="ss">key</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">old</span><span·class="p">.</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">
183 ···········</span><span·class="ss">val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">old</span><span·class="p">.</span><span·class="ss">val</span><span·class="p">,</span><span·class="w">183 ···········</span><span·class="ss">val</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">X</span><span·class="o">#</span><span·class="ss">old</span><span·class="p">.</span><span·class="ss">val</span><span·class="p">,</span><span·class="w">
184 ···········</span><span·class="ss">extra</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="6256739158-7">}</span><span·class="w">184 ···········</span><span·class="ss">extra</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="1426282091-7">}</span><span·class="w">
185 ···</span><span·class="k">end</span><span·class="p">,</span><span·class="w">185 ···</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
186 </span><span·class="p"·data-group-id="6256739158-8">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p"·data-group-id="6256739158-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·129,·SHA:·4a20e6953d12aa55d646f543ebfbce383978548ecdfe10377157f20a698c78da·...·]-9">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Transformer</span><span·class="p">,</span><span·class="w">186 </span><span·class="p"·data-group-id="1426282091-8">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p"·data-group-id="1426282091-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·129,·SHA:·06b286d6c460c5c8bebe79b7a68be37c2736b663d2d3a6715b04e5845cb28d7d·...·]-9">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Transformer</span><span·class="p">,</span><span·class="w">
187 ······································</span><span·class="nf">record_info</span><span·class="p"·data-group-id="6256739158-10">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new</span><span·class="p"·data-group-id="6256739158-10">)</span><span·class="p">,</span><span·class="w">187 ······································</span><span·class="nf">record_info</span><span·class="p"·data-group-id="1426282091-10">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">new</span><span·class="p"·data-group-id="1426282091-10">)</span><span·class="p">,</span><span·class="w">
188 ······································</span><span·class="ss">new</span><span·class="p"·data-group-id="6256739158-9">)</span><span·class="p">,</span></code></pre><p>Argument·<code·class="inline">Fun</code>·can·also·be·the·atom·<code·class="inline">ignore</code>,·which·indicates·that·only·the188 ······································</span><span·class="ss">new</span><span·class="p"·data-group-id="1426282091-9">)</span><span·class="p">,</span></code></pre><p>Argument·<code·class="inline">Fun</code>·can·also·be·the·atom·<code·class="inline">ignore</code>,·which·indicates·that·only·the
189 metadata·about·the·table·is·updated.·Use·of·<code·class="inline">ignore</code>·is·not·recommended·(as·it189 metadata·about·the·table·is·updated.·Use·of·<code·class="inline">ignore</code>·is·not·recommended·(as·it
190 creates·inconsistencies·between·the·metadata·and·the·actual·data)·but·it·is190 creates·inconsistencies·between·the·metadata·and·the·actual·data)·but·it·is
191 included·as·a·possibility·for·the·user·do·to·an·own·(offline)·transform.</p></li><li><p><a·href="mnesia.html#change_table_copy_type/3"><code·class="inline">mnesia:change_table_copy_type(Tab,·Node,·ToType)</code></a>191 included·as·a·possibility·for·the·user·do·to·an·own·(offline)·transform.</p></li><li><p><a·href="mnesia.html#change_table_copy_type/3"><code·class="inline">mnesia:change_table_copy_type(Tab,·Node,·ToType)</code></a>
192 changes·the·storage·type·of·a·table.·For·example,·a·RAM·table·is·changed·to·a192 changes·the·storage·type·of·a·table.·For·example,·a·RAM·table·is·changed·to·a
193 <code·class="inline">disc_table</code>·at·the·node·specified·as·<code·class="inline">Node</code>.</p></li></ul><h2·id="data-model"·class="section-heading">193 <code·class="inline">disc_table</code>·at·the·node·specified·as·<code·class="inline">Node</code>.</p></li></ul><h2·id="data-model"·class="section-heading">
194 ··<a·href="#data-model"·class="hover-link">194 ··<a·href="#data-model"·class="hover-link">
195 ····<i·class="ri-link-m"·aria-hidden="true"></i>195 ····<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 234, 37 lines modifiedOffset 234, 37 lines modified
234 <a·href="mnesia_chap2.html#getting_started">Getting·Started</a>·to·illustrate·how·to·run·a234 <a·href="mnesia_chap2.html#getting_started">Getting·Started</a>·to·illustrate·how·to·run·a
235 database·on·two·separate·nodes,·called·<code·class="inline">a@gin</code>·and·<code·class="inline">b@skeppet</code>.·Each·of·these235 database·on·two·separate·nodes,·called·<code·class="inline">a@gin</code>·and·<code·class="inline">b@skeppet</code>.·Each·of·these
236 nodes·must·have·a·<code·class="inline">Mnesia</code>·directory·and·an·initialized·schema·before·<code·class="inline">Mnesia</code>236 nodes·must·have·a·<code·class="inline">Mnesia</code>·directory·and·an·initialized·schema·before·<code·class="inline">Mnesia</code>
237 can·be·started.·There·are·two·ways·to·specify·the·<code·class="inline">Mnesia</code>·directory·to·be·used:</p><ul><li><p>Specify·the·<code·class="inline">Mnesia</code>·directory·by·providing·an·application·parameter·either237 can·be·started.·There·are·two·ways·to·specify·the·<code·class="inline">Mnesia</code>·directory·to·be·used:</p><ul><li><p>Specify·the·<code·class="inline">Mnesia</code>·directory·by·providing·an·application·parameter·either
238 when·starting·the·Erlang·shell·or·in·the·application·script.·Previously,·the238 when·starting·the·Erlang·shell·or·in·the·application·script.·Previously,·the
239 following·example·was·used·to·create·the·directory·for·the·<code·class="inline">Company</code>·database:</p><pre><code·class="text">%·erl·-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.Company&quot;'</code></pre></li><li><p>If·no·command-line·flag·is·entered,·the·<code·class="inline">Mnesia</code>·directory·becomes·the·current239 following·example·was·used·to·create·the·directory·for·the·<code·class="inline">Company</code>·database:</p><pre><code·class="text">%·erl·-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.Company&quot;'</code></pre></li><li><p>If·no·command-line·flag·is·entered,·the·<code·class="inline">Mnesia</code>·directory·becomes·the·current
240 working·directory·on·the·node·where·the·Erlang·shell·is·started.</p></li></ul><p>To·start·the·<code·class="inline">Company</code>·database·and·get·it·running·on·the·two·specified·nodes,240 working·directory·on·the·node·where·the·Erlang·shell·is·started.</p></li></ul><p>To·start·the·<code·class="inline">Company</code>·database·and·get·it·running·on·the·two·specified·nodes,
241 enter·the·following·commands:</p><ol><li>On·the·node·<code·class="inline">a@gin</code>:</li></ol><pre><code·class="text">·gin·%·erl·-sname·a··-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.company&quot;'</code></pre><ol·start="2"><li>On·the·node·<code·class="inline">b@skeppet</code>:</li></ol><pre><code·class="text">skeppet·%·erl·-sname·b·-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.company&quot;'</code></pre><ol·start="3"><li>On·one·of·the·two·nodes:</li></ol><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(a@gin)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="7240787506-1">(</span><span·class="p"·data-group-id="7240787506-2">[</span><span·class="ss">a@gin</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b@skeppet</span><span·class="p"·data-group-id="7240787506-2">]</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·6e737f657f9380bce8a2064629384a4349ec051328f848322177f5d4fd533a35·...·]-1">)</span><span·class="p">.</span></code></pre><ol·start="4"><li>The·function·<a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>·is·called·on·both·nodes.</li><li>To·initialize·the·database,·execute·the·following·code·on·one·of·the·two241 enter·the·following·commands:</p><ol><li>On·the·node·<code·class="inline">a@gin</code>:</li></ol><pre><code·class="text">·gin·%·erl·-sname·a··-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.company&quot;'</code></pre><ol·start="2"><li>On·the·node·<code·class="inline">b@skeppet</code>:</li></ol><pre><code·class="text">skeppet·%·erl·-sname·b·-mnesia·dir·'&quot;/ldisc/scratch/Mnesia.company&quot;'</code></pre><ol·start="3"><li>On·one·of·the·two·nodes:</li></ol><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(a@gin)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="5043843700-1">(</span><span·class="p"·data-group-id="5043843700-2">[</span><span·class="ss">a@gin</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b@skeppet</span><span·class="p"·data-group-id="5043843700-2">]</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·06974995335b89b1faf293a1b8bc586069e684e58a55a2342ba7ef88c46d7ef8·...·]-1">)</span><span·class="p">.</span></code></pre><ol·start="4"><li>The·function·<a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>·is·called·on·both·nodes.</li><li>To·initialize·the·database,·execute·the·following·code·on·one·of·the·two
242 nodes:</li></ol><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">dist_init</span><span·class="p"·data-group-id="3511721287-1">(</span><span·class="p"·data-group-id="3511721287-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">242 nodes:</li></ol><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">dist_init</span><span·class="p"·data-group-id="2232866515-1">(</span><span·class="p"·data-group-id="2232866515-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
243 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3511721287-2">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">243 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2232866515-2">(</span><span·class="ss">employee</span><span·class="p">,</span><span·class="w">
244 ·························</span><span·class="p"·data-group-id="3511721287-3">[</span><span·class="p"·data-group-id="3511721287-4">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-5">[</span><span·class="ss">a@gin</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·158,·SHA:·999a59459ebfc1cfa133132cff06adbb105751965b9df6bc2816fa7d3b6945c4·...·]-4">}</span><span·class="p">,</span><span·class="w">244 ·························</span><span·class="p"·data-group-id="2232866515-3">[</span><span·class="p"·data-group-id="2232866515-4">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-5">[</span><span·class="ss">a@gin</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·158,·SHA:·afa3a6cf09e6ad5040239054180043feac8313f05410278c8ae039d7996ac165·...·]-4">}</span><span·class="p">,</span><span·class="w">
245 ··························</span><span·class="p"·data-group-id="3511721287-6">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3511721287-7">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">245 ··························</span><span·class="p"·data-group-id="2232866515-6">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2232866515-7">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">
246 ···················································</span><span·class="ss">employee</span><span·class="p"·data-group-id="3511721287-7">)</span><span·class="p"·data-group-id="3511721287-6">}</span><span·class="p"·data-group-id="3511721287-3">]</span><span·class="p"·data-group-id="3511721287-2">)</span><span·class="p">,</span><span·class="w">246 ···················································</span><span·class="ss">employee</span><span·class="p"·data-group-id="2232866515-7">)</span><span·class="p"·data-group-id="2232866515-6">}</span><span·class="p"·data-group-id="2232866515-3">]</span><span·class="p"·data-group-id="2232866515-2">)</span><span·class="p">,</span><span·class="w">
247 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3511721287-8">(</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">247 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2232866515-8">(</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">
248 ·························</span><span·class="p"·data-group-id="3511721287-9">[</span><span·class="p"·data-group-id="3511721287-10">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-11">[</span><span·class="ss">a@gin</span><span·class="p"[·...·truncated·by·diffoscope;·len:·161,·SHA:·1aa864f56c7c89c00db77c9b50f2b350d42062b55f032ff86edd7f2a083b1252·...·]-10">}</span><span·class="p">,</span><span·class="w">248 ·························</span><span·class="p"·data-group-id="2232866515-9">[</span><span·class="p"·data-group-id="2232866515-10">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-11">[</span><span·class="ss">a@gin</span><span·class="p"[·...·truncated·by·diffoscope;·len:·161,·SHA:·a7bf32dbbd9c3f1564e140ebc5e83b14212f4f176f2d136b9b0b486667cf59b3·...·]-10">}</span><span·class="p">,</span><span·class="w">
249 ··························</span><span·class="p"·data-group-id="3511721287-12">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3511721287-13">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·246,·SHA:·44b48a8fcce16cd93a882a4b3dc4f14abaef894b9426e27699672dccc6477332·...·]-8">)</span><span·class="p">,</span><span·class="w">249 ··························</span><span·class="p"·data-group-id="2232866515-12">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2232866515-13">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·246,·SHA:·bade3699fa8326a7f7a3fb203b8378ef95ae64b0e806d7c3a6f722e17e858586·...·]-8">)</span><span·class="p">,</span><span·class="w">
250 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3511721287-14">(</span><span·class="ss">project</span><span·class="p">,</span><span·class="w">250 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2232866515-14">(</span><span·class="ss">project</span><span·class="p">,</span><span·class="w">
251 ·························</span><span·class="p"·data-group-id="3511721287-15">[</span><span·class="p"·data-group-id="3511721287-16">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-17">[</span><span·class="ss">a@gin</span><span·class="p[·...·truncated·by·diffoscope;·len:·162,·SHA:·e71311b4683718e985d925bfb4726aca039c39498532d122bead1b08baf97f11·...·]-16">}</span><span·class="p">,</span><span·class="w">251 ·························</span><span·class="p"·data-group-id="2232866515-15">[</span><span·class="p"·data-group-id="2232866515-16">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-17">[</span><span·class="ss">a@gin</span><span·class="p[·...·truncated·by·diffoscope;·len:·162,·SHA:·2d95e2dec834947888f33cb92a2d3b27bc21ef739720d7b4c85fe4f4e4e2db20·...·]-16">}</span><span·class="p">,</span><span·class="w">
252 ··························</span><span·class="p"·data-group-id="3511721287-18">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3511721287-19">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·b164cbc077ff21470c9cb979a716d6b8744bcd1b1f08ceed8efa562cde2e9480·...·]-14">)</span><span·class="p">,</span><span·class="w">252 ··························</span><span·class="p"·data-group-id="2232866515-18">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2232866515-19">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·b80e8b10b66e5d3757aa9df15cac2421d8b10d789e1910a1922b67b3f48ab5cf·...·]-14">)</span><span·class="p">,</span><span·class="w">
253 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3511721287-20">(</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-21">[</span><span·class="p"·data-group-id="3511721287-22">{</span><span·class="ss">type</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·98,·SHA:·d7cd5534f4a3347f456388ab6048ac82815f720e61c0f0a9d35cc007af68c34b·...·]-22">}</span><span·class="p">,</span><span·class="w">253 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2232866515-20">(</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-21">[</span><span·class="p"·data-group-id="2232866515-22">{</span><span·class="ss">type</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·98,·SHA:·e582c1e575ede10a03fcdc0d1b7e852b55fa39cc1161326291538ca4d2de0189·...·]-22">}</span><span·class="p">,</span><span·class="w">
254 ··································</span><span·class="p"·data-group-id="3511721287-23">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-24">[</span><span·class="ss">a@gin</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b@s[·...·truncated·by·diffoscope;·len:·108,·SHA:·978f6fe7096642ada12c35372f6b7f9839c7d6f1be8a432233458d651eebc991·...·]-23">}</span><span·class="p">,</span><span·class="w">254 ··································</span><span·class="p"·data-group-id="2232866515-23">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-24">[</span><span·class="ss">a@gin</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b@s[·...·truncated·by·diffoscope;·len:·108,·SHA:·1e1f01f0a952b8b35aa0406d71f583f7cfdada981b6d6601594ee6593423b0d3·...·]-23">}</span><span·class="p">,</span><span·class="w">
255 ··································</span><span·class="p"·data-group-id="3511721287-25">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3511721287-26">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">255 ··································</span><span·class="p"·data-group-id="2232866515-25">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2232866515-26">(</span><span·class="ss">fields</span><span·class="p">,</span><span·class="w">
256 ···························································</span><span·class="ss">manager</span><span·class="p"·data-group-id="3511721287-26">)</span><span·class="p"·data-group-id="3511721287-25">}</span><span·class="p"·data-group-id="3511721287-21">]</span><span·class="p"·data-group-id="3511721287-20">)</span><span·class="p">,</span><span·class="w">256 ···························································</span><span·class="ss">manager</span><span·class="p"·data-group-id="2232866515-26">)</span><span·class="p"·data-group-id="2232866515-25">}</span><span·class="p"·data-group-id="2232866515-21">]</span><span·class="p"·data-group-id="2232866515-20">)</span><span·class="p">,</span><span·class="w">
257 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3511721287-27">(</span><span·class="ss">at_dep</span><span·class="p">,</span><span·class="w">257 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2232866515-27">(</span><span·class="ss">at_dep</span><span·class="p">,</span><span·class="w">
258 ·························</span><span·class="p"·data-group-id="3511721287-28">[</span><span·class="p"·data-group-id="3511721287-29">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-30">[</span><span·class="ss">a@gin</span><span·class="p[·...·truncated·by·diffoscope;·len:·162,·SHA:·ccf8c7b1c00115764efa16cd30b6a5f61e16a8faaee42159e1d0c1a34f84cb0c·...·]-29">}</span><span·class="p">,</span><span·class="w">258 ·························</span><span·class="p"·data-group-id="2232866515-28">[</span><span·class="p"·data-group-id="2232866515-29">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-30">[</span><span·class="ss">a@gin</span><span·class="p[·...·truncated·by·diffoscope;·len:·162,·SHA:·a05a86eb7351ef3d47471ac26a1ede2882cb86e8fe6f58cf59c3c471f32c4d39·...·]-29">}</span><span·class="p">,</span><span·class="w">
259 ··························</span><span·class="p"·data-group-id="3511721287-31">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3511721287-32">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·249,·SHA:·94ac5c756b4df91aefd03d09aa0e6a5a8d865c476b96440a73b1a1e0ed4eed5d·...·]-27">)</span><span·class="p">,</span><span·class="w">259 ··························</span><span·class="p"·data-group-id="2232866515-31">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2232866515-32">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·249,·SHA:·97bbdb6a8f1d86a2ed277dc89607b0fa1c4b800cbe80fe0db6c49de3dd2a8c56·...·]-27">)</span><span·class="p">,</span><span·class="w">
260 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3511721287-33">(</span><span·class="ss">in_proj</span><span·class="p">,</span><span·class="w">260 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2232866515-33">(</span><span·class="ss">in_proj</span><span·class="p">,</span><span·class="w">
261 ························</span><span·class="p"·data-group-id="3511721287-34">[</span><span·class="p"·data-group-id="3511721287-35">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bag</span><span·class="p"·data-group-id="3511721287-35">}</span><span·class="p">,</span><span·class="w">261 ························</span><span·class="p"·data-group-id="2232866515-34">[</span><span·class="p"·data-group-id="2232866515-35">{</span><span·class="ss">type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bag</span><span·class="p"·data-group-id="2232866515-35">}</span><span·class="p">,</span><span·class="w">
262 ·························</span><span·class="p"·data-group-id="3511721287-36">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511721287-37">[</span><span·class="ss">a@gin</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b@s[·...·truncated·by·diffoscope;·len:·108,·SHA:·4d96e971aa2883d9b6aac5353e008378a4261512ae4ece6217b97a38f653fe28·...·]-36">}</span><span·class="p">,</span><span·class="w">262 ·························</span><span·class="p"·data-group-id="2232866515-36">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2232866515-37">[</span><span·class="ss">a@gin</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b@s[·...·truncated·by·diffoscope;·len:·108,·SHA:·9cde3ac8a01ef2ac62584c10ed0c9d9b67f2784b4fb59838f73cccefd7c188c3·...·]-36">}</span><span·class="p">,</span><span·class="w">
263 ·························</span><span·class="p"·data-group-id="3511721287-38">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="3511721287-39">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·44b479eece54c674d2a9bfc3ccdc17e7a551662e24fdbf513057b9bafce96379·...·]-33">)</span><span·class="p">.</span></code></pre><p>As·illustrated,·the·two·directories·reside·on·different·nodes,·because263 ·························</span><span·class="p"·data-group-id="2232866515-38">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="2232866515-39">(</span><span·class="ss">fields</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·250,·SHA:·23637987a4dd1308d6db65bb976fcbf82221b1264faf04ba77c96ab3441cb57a·...·]-33">)</span><span·class="p">.</span></code></pre><p>As·illustrated,·the·two·directories·reside·on·different·nodes,·because
264 <code·class="inline">/ldisc/scratch</code>·(the·&quot;local&quot;·disc)·exists·on·the·two·different·nodes.</p><p>By·executing·these·commands,·two·Erlang·nodes·are·configured·to·run·the264 <code·class="inline">/ldisc/scratch</code>·(the·&quot;local&quot;·disc)·exists·on·the·two·different·nodes.</p><p>By·executing·these·commands,·two·Erlang·nodes·are·configured·to·run·the
265 <code·class="inline">Company</code>·database,·and·therefore,·initialize·the·database.·This·is·required265 <code·class="inline">Company</code>·database,·and·therefore,·initialize·the·database.·This·is·required
266 only·once·when·setting·up.·The·next·time·the·system·is·started,266 only·once·when·setting·up.·The·next·time·the·system·is·started,
267 <a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>·is·called·on·both·nodes,·to·initialize·the267 <a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>·is·called·on·both·nodes,·to·initialize·the
268 system·from·disc.</p><p>In·a·system·of·<code·class="inline">Mnesia</code>·nodes,·every·node·is·aware·of·the·current·location·of268 system·from·disc.</p><p>In·a·system·of·<code·class="inline">Mnesia</code>·nodes,·every·node·is·aware·of·the·current·location·of
269 all·tables.·In·this·example,·data·is·replicated·on·both·nodes·and·functions·that269 all·tables.·In·this·example,·data·is·replicated·on·both·nodes·and·functions·that
270 manipulate·the·data·in·the·tables·can·be·executed·on·either·of·the·two·nodes.270 manipulate·the·data·in·the·tables·can·be·executed·on·either·of·the·two·nodes.
Offset 273, 15 lines modifiedOffset 273, 15 lines modified
273 the·function·is·executed.·The·functions·<a·href="mnesia.html#start/0"><code·class="inline">mnesia:start/0</code></a>·and·<a·href="mnesia.html#stop/0"><code·class="inline">mnesia:stop/0</code></a>273 the·function·is·executed.·The·functions·<a·href="mnesia.html#start/0"><code·class="inline">mnesia:start/0</code></a>·and·<a·href="mnesia.html#stop/0"><code·class="inline">mnesia:stop/0</code></a>
274 work·on·the·&quot;local&quot;·<code·class="inline">Mnesia</code>·system.·No·functions·start·or·stop·a·set·of·nodes.</p><h3·id="startup-procedure"·class="section-heading">274 work·on·the·&quot;local&quot;·<code·class="inline">Mnesia</code>·system.·No·functions·start·or·stop·a·set·of·nodes.</p><h3·id="startup-procedure"·class="section-heading">
275 ··<a·href="#startup-procedure"·class="hover-link">275 ··<a·href="#startup-procedure"·class="hover-link">
276 ····<i·class="ri-link-m"·aria-hidden="true"></i>276 ····<i·class="ri-link-m"·aria-hidden="true"></i>
277 ··</a>277 ··</a>
278 ··<span·class="text">Startup·Procedure</span>278 ··<span·class="text">Startup·Procedure</span>
279 </h3>279 </h3>
280 <p>Start·<code·class="inline">Mnesia</code>·by·calling·the·following·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="0314756817-1">(</span><span·class="p"·data-group-id="0314756817-1">)</span><span·class="p">.</span></code></pre><p>This·function·initiates·the·DBMS·locally.</p><p>The·choice·of·configuration·alters·the·location·and·load·order·of·the·tables.280 <p>Start·<code·class="inline">Mnesia</code>·by·calling·the·following·function:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1205588779-1">(</span><span·class="p"·data-group-id="1205588779-1">)</span><span·class="p">.</span></code></pre><p>This·function·initiates·the·DBMS·locally.</p><p>The·choice·of·configuration·alters·the·location·and·load·order·of·the·tables.
281 The·alternatives·are·as·follows:</p><ol><li>Tables·that·are·only·stored·locally·are·initialized·from·the·local·<code·class="inline">Mnesia</code>281 The·alternatives·are·as·follows:</p><ol><li>Tables·that·are·only·stored·locally·are·initialized·from·the·local·<code·class="inline">Mnesia</code>
282 directory.</li><li>Replicated·tables·that·reside·locally·as·well·as·somewhere·else·are·either282 directory.</li><li>Replicated·tables·that·reside·locally·as·well·as·somewhere·else·are·either
283 initiated·from·disc·or·by·copying·the·entire·table·from·the·other·node,283 initiated·from·disc·or·by·copying·the·entire·table·from·the·other·node,
284 depending·on·which·of·the·different·replicas·are·the·most·recent.·<code·class="inline">Mnesia</code>284 depending·on·which·of·the·different·replicas·are·the·most·recent.·<code·class="inline">Mnesia</code>
285 determines·which·of·the·tables·are·the·most·recent.</li><li>Tables·that·reside·on·remote·nodes·are·available·to·other·nodes·as·soon·as285 determines·which·of·the·tables·are·the·most·recent.</li><li>Tables·that·reside·on·remote·nodes·are·available·to·other·nodes·as·soon·as
286 they·are·loaded.</li></ol><p>Table·initialization·is·asynchronous.·The·function·call286 they·are·loaded.</li></ol><p>Table·initialization·is·asynchronous.·The·function·call
287 <a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>·returns·the·atom·<code·class="inline">ok</code>·and·then·starts·to287 <a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>·returns·the·atom·<code·class="inline">ok</code>·and·then·starts·to
Offset 296, 17 lines modifiedOffset 296, 17 lines modified
296 situation,·a·call·to·<a·href="mnesia.html#wait_for_tables/2"><code·class="inline">mnesia:wait_for_tables/2</code></a>,·suspends·the·caller·until·the296 situation,·a·call·to·<a·href="mnesia.html#wait_for_tables/2"><code·class="inline">mnesia:wait_for_tables/2</code></a>,·suspends·the·caller·until·the
297 remote·node·has·initialized·the·table·from·its·local·disc·and·the·node·has297 remote·node·has·initialized·the·table·from·its·local·disc·and·the·node·has
298 copied·the·table·over·the·network·to·the·local·node.</p><p>However,·this·procedure·can·be·time-consuming,·the·shortcut·function298 copied·the·table·over·the·network·to·the·local·node.</p><p>However,·this·procedure·can·be·time-consuming,·the·shortcut·function
299 <a·href="mnesia.html#force_load_table/1"><code·class="inline">mnesia:force_load_table(Tab)</code></a>·loads·all·the·tables299 <a·href="mnesia.html#force_load_table/1"><code·class="inline">mnesia:force_load_table(Tab)</code></a>·loads·all·the·tables
300 from·disc·at·a·faster·rate.·The·function·forces·tables·to·be·loaded·from·disc300 from·disc·at·a·faster·rate.·The·function·forces·tables·to·be·loaded·from·disc
301 regardless·of·the·network·situation.</p><p>Thus,·it·can·be·assumed·that·if·an·application·wants·to·use·tables·<code·class="inline">a</code>·and·<code·class="inline">b</code>,301 regardless·of·the·network·situation.</p><p>Thus,·it·can·be·assumed·that·if·an·application·wants·to·use·tables·<code·class="inline">a</code>·and·<code·class="inline">b</code>,
302 the·application·must·perform·some·action·similar·to·following·before·it·can·use302 the·application·must·perform·some·action·similar·to·following·before·it·can·use
303 the·tables:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">wait_for_tables</span><span·class="p"·data-group-id="1026188656-1">(</span><span·class="p"·data-group-id="1026188656-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="1026188656-2">]</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·87,·SHA:·4b644f059a979824ed4d66d922cc1f33446544cd82298a30c8014a0e55dfe51c·...·]6-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">303 the·tables:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">wait_for_tables</span><span·class="p"·data-group-id="6725322466-1">(</span><span·class="p"·data-group-id="6725322466-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p"·data-group-id="6725322466-2">]</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·87,·SHA:·36f85feab960f300c650fa7c3d50149d98e376ceea73fe3ad746e20b563c5a4d·...·]6-1">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
304 ··</span><span·class="p"·data-group-id="1026188656-3">{</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RemainingTabs</span><span·class="p"·data-group-id="1026188656-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">304 ··</span><span·class="p"·data-group-id="6725322466-3">{</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RemainingTabs</span><span·class="p"·data-group-id="6725322466-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
305 ····</span><span·class="nf">panic</span><span·class="p"·data-group-id="1026188656-4">(</span><span·class="n">RemainingTabs</span><span·class="p"·data-group-id="1026188656-4">)</span><span·class="p">;</span><span·class="w">305 ····</span><span·class="nf">panic</span><span·class="p"·data-group-id="6725322466-4">(</span><span·class="n">RemainingTabs</span><span·class="p"·data-group-id="6725322466-4">)</span><span·class="p">;</span><span·class="w">
306 ··</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">306 ··</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
307 ····</span><span·class="ss">synced</span><span·class="w">307 ····</span><span·class="ss">synced</span><span·class="w">
308 </span><span·class="k">end</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>When·tables·are·forcefully·loaded·from·the·local·disc,·all·operations·that308 </span><span·class="k">end</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>When·tables·are·forcefully·loaded·from·the·local·disc,·all·operations·that
309 were·performed·on·the·replicated·table·while·the·local·node·was·down,·and·the309 were·performed·on·the·replicated·table·while·the·local·node·was·down,·and·the
310 remote·replica·was·alive,·are·lost.·This·can·cause·the·database·to·become310 remote·replica·was·alive,·are·lost.·This·can·cause·the·database·to·become
311 inconsistent.</p></section><p>If·the·startup·procedure·fails,·the·function·<a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>311 inconsistent.</p></section><p>If·the·startup·procedure·fails,·the·function·<a·href="mnesia.html#start/0"><code·class="inline">mnesia:start()</code></a>
312 returns·the·cryptic·tuple312 returns·the·cryptic·tuple
Offset 324, 21 lines modifiedOffset 324, 21 lines modified
324 the·records·that·constitute·the·table.·For·details,·see·<code·class="inline">record_name</code>.</li><li><code·class="inline">Opts</code>·is·a·list·of·<code·class="inline">{Key,Value}</code>·tuples.·The·following·options·are324 the·records·that·constitute·the·table.·For·details,·see·<code·class="inline">record_name</code>.</li><li><code·class="inline">Opts</code>·is·a·list·of·<code·class="inline">{Key,Value}</code>·tuples.·The·following·options·are
325 valid:<ul><li><p><code·class="inline">{type,·Type}</code>,·where·<code·class="inline">Type</code>·must·be·either·of·the·atoms·<code·class="inline">set</code>,325 valid:<ul><li><p><code·class="inline">{type,·Type}</code>,·where·<code·class="inline">Type</code>·must·be·either·of·the·atoms·<code·class="inline">set</code>,
326 <code·class="inline">ordered_set</code>,·or·<code·class="inline">bag</code>.·Default·is·<code·class="inline">set</code>.</p><p>Notice·that·currently·<code·class="inline">ordered_set</code>·is·not·supported·for·<code·class="inline">disc_only_copies</code>326 <code·class="inline">ordered_set</code>,·or·<code·class="inline">bag</code>.·Default·is·<code·class="inline">set</code>.</p><p>Notice·that·currently·<code·class="inline">ordered_set</code>·is·not·supported·for·<code·class="inline">disc_only_copies</code>
327 tables.</p><p>A·table·of·type·<code·class="inline">set</code>·or·<code·class="inline">ordered_set</code>·has·either·zero·or·one·record·per327 tables.</p><p>A·table·of·type·<code·class="inline">set</code>·or·<code·class="inline">ordered_set</code>·has·either·zero·or·one·record·per
328 key,·whereas·a·table·of·type·<code·class="inline">bag</code>·can·have·an·arbitrary·number·of·records328 key,·whereas·a·table·of·type·<code·class="inline">bag</code>·can·have·an·arbitrary·number·of·records
329 per·key.·The·key·for·each·record·is·always·the·first·attribute·of·the329 per·key.·The·key·for·each·record·is·always·the·first·attribute·of·the
330 record.</p><p>The·following·example·illustrates·the·difference·between·type·<code·class="inline">set</code>·and330 record.</p><p>The·following·example·illustrates·the·difference·between·type·<code·class="inline">set</code>·and
331 <code·class="inline">bag</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="nf">f</span><span·class="p"·data-group-id="0972071154-1">(</span><span·class="p"·data-group-id="0972071154-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">331 <code·class="inline">bag</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="nf">f</span><span·class="p"·data-group-id="7880006287-1">(</span><span·class="p"·data-group-id="7880006287-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
332 ····</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0972071154-2">(</span><span·class="p"·data-group-id="0972071154-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">332 ····</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7880006287-2">(</span><span·class="p"·data-group-id="7880006287-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
333 ··········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="0972071154-3">(</span><span·class="p"·data-group-id="0972071154-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·cl[·...·truncated·by·diffoscope;·len:·86,·SHA:·cd0260d6248a4692112800923ea8d42f6da730655372816c20b1b85145700626·...·]-3">)</span><span·class="p">,</span><span·class="w">333 ··········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7880006287-3">(</span><span·class="p"·data-group-id="7880006287-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·cl[·...·truncated·by·diffoscope;·len:·86,·SHA:·f117f1285302272fe085c4cf3727198e6b419df8f6975e69ec8092bb62f8c299·...·]-3">)</span><span·class="p">,</span><span·class="w">
334 ··········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="0972071154-5">(</span><span·class="p"·data-group-id="0972071154-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·cl[·...·truncated·by·diffoscope;·len:·86,·SHA:·2caa7c4ec06ec76eaaa71266d81ce302af262e3a2d241b3eca6008c37693c591·...·]-5">)</span><span·class="p">,</span><span·class="w">334 ··········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7880006287-5">(</span><span·class="p"·data-group-id="7880006287-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·cl[·...·truncated·by·diffoscope;·len:·86,·SHA:·bde68dabc27044b6cbf9d560a88f04bad55c586ce7d72e29a894f31f80b50795·...·]-5">)</span><span·class="p">,</span><span·class="w">
335 ··········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><span·class="p"·data-group-id="0972071154-7">(</span><span·class="p"·data-group-id="0972071154-8">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0972071154-8">}</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·79c1d13c875ee76e6de0bf261e06dd695598eefc2f6604fbd36627b0e143c4dd·...·]-7">)</span><span·class="w">335 ··········</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><span·class="p"·data-group-id="7880006287-7">(</span><span·class="p"·data-group-id="7880006287-8">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7880006287-8">}</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·eed6bd99f6afabd54599f6857c1d493d14ef72f3a5275395f5c3161a8dd2fbad·...·]-7">)</span><span·class="w">
336 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">336 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
337 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="0972071154-9">(</span><span·class="n">F</span><span·class="p"·data-group-id="0972071154-9">)</span><span·class="p">.</span></code></pre><p>This·transaction·returns·the·list·<code·class="inline">[{foo,1,3}]</code>·if·table·<code·class="inline">foo</code>·is·of·type337 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="7880006287-9">(</span><span·class="n">F</span><span·class="p"·data-group-id="7880006287-9">)</span><span·class="p">.</span></code></pre><p>This·transaction·returns·the·list·<code·class="inline">[{foo,1,3}]</code>·if·table·<code·class="inline">foo</code>·is·of·type
338 <code·class="inline">set</code>.·However,·the·list·<code·class="inline">[{foo,1,2},·{foo,1,3}]</code>·is·returned·if·the·table338 <code·class="inline">set</code>.·However,·the·list·<code·class="inline">[{foo,1,2},·{foo,1,3}]</code>·is·returned·if·the·table
339 is·of·type·<code·class="inline">bag</code>.</p><p><code·class="inline">Mnesia</code>·tables·can·never·contain·duplicates·of·the·same·record·in·the·same339 is·of·type·<code·class="inline">bag</code>.</p><p><code·class="inline">Mnesia</code>·tables·can·never·contain·duplicates·of·the·same·record·in·the·same
340 table.·Duplicate·records·have·attributes·with·the·same·contents·and·key.</p></li><li><p><code·class="inline">{disc_copies,·NodeList}</code>,·where·<code·class="inline">NodeList</code>·is·a·list·of·the·nodes·where340 table.·Duplicate·records·have·attributes·with·the·same·contents·and·key.</p></li><li><p><code·class="inline">{disc_copies,·NodeList}</code>,·where·<code·class="inline">NodeList</code>·is·a·list·of·the·nodes·where
341 this·table·is·to·reside·on·disc.</p><p>Write·operations·to·a·table·replica·of·type·<code·class="inline">disc_copies</code>·write·data·to·the341 this·table·is·to·reside·on·disc.</p><p>Write·operations·to·a·table·replica·of·type·<code·class="inline">disc_copies</code>·write·data·to·the
342 disc·copy·and·to·the·RAM·copy·of·the·table.</p><p>It·is·possible·to·have·a·replicated·table·of·type·<code·class="inline">disc_copies</code>·on·one·node,342 disc·copy·and·to·the·RAM·copy·of·the·table.</p><p>It·is·possible·to·have·a·replicated·table·of·type·<code·class="inline">disc_copies</code>·on·one·node,
343 and·the·same·table·stored·as·a·different·type·on·another·node.·Default·is343 and·the·same·table·stored·as·a·different·type·on·another·node.·Default·is
344 <code·class="inline">[]</code>.·This·arrangement·is·desirable·if·the·following·operational344 <code·class="inline">[]</code>.·This·arrangement·is·desirable·if·the·following·operational
Offset 374, 19 lines modifiedOffset 374, 19 lines modified
374 possible·for·you·to·provide·the·attribute·names·or·to·use·the374 possible·for·you·to·provide·the·attribute·names·or·to·use·the
375 <code·class="inline">record_info/2</code>·notation.</p><p>It·is·recommended·to·use·the·<code·class="inline">record_info/2</code>·notation,·as·it·becomes·easier375 <code·class="inline">record_info/2</code>·notation.</p><p>It·is·recommended·to·use·the·<code·class="inline">record_info/2</code>·notation,·as·it·becomes·easier
376 to·maintain·the·program·and·the·program·becomes·more·robust·with·regards·to376 to·maintain·the·program·and·the·program·becomes·more·robust·with·regards·to
377 future·record·changes.</p></li><li><p><code·class="inline">{record_name,·Atom}</code>·specifies·the·common·name·of·all·records·stored·in·the377 future·record·changes.</p></li><li><p><code·class="inline">{record_name,·Atom}</code>·specifies·the·common·name·of·all·records·stored·in·the
378 table.·All·records·stored·in·the·table·must·have·this·name·as·their·first378 table.·All·records·stored·in·the·table·must·have·this·name·as·their·first
379 element.·<code·class="inline">record_name</code>·defaults·to·the·name·of·the·table.·For·more379 element.·<code·class="inline">record_name</code>·defaults·to·the·name·of·the·table.·For·more
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141 <p>Transactions·are·important·when·designing·fault-tolerant,·distributed·systems.·A141 <p>Transactions·are·important·when·designing·fault-tolerant,·distributed·systems.·A
142 <code·class="inline">Mnesia</code>·transaction·is·a·mechanism·by·which·a·series·of·database·operations·can142 <code·class="inline">Mnesia</code>·transaction·is·a·mechanism·by·which·a·series·of·database·operations·can
143 be·executed·as·one·functional·block.·The·functional·block·that·is·run·as·a143 be·executed·as·one·functional·block.·The·functional·block·that·is·run·as·a
144 transaction·is·called·a·Functional·Object·(Fun),·and·this·code·can·read,·write,144 transaction·is·called·a·Functional·Object·(Fun),·and·this·code·can·read,·write,
145 and·delete·<code·class="inline">Mnesia</code>·records.·The·Fun·is·evaluated·as·a·transaction·that·either145 and·delete·<code·class="inline">Mnesia</code>·records.·The·Fun·is·evaluated·as·a·transaction·that·either
146 commits·or·terminates.·If·a·transaction·succeeds·in·executing·the·Fun,·it146 commits·or·terminates.·If·a·transaction·succeeds·in·executing·the·Fun,·it
147 replicates·the·action·on·all·nodes·involved,·or·terminates·if·an·error·occurs.</p><p>The·following·example·shows·a·transaction·that·raises·the·salary·of·certain147 replicates·the·action·on·all·nodes·involved,·or·terminates·if·an·error·occurs.</p><p>The·following·example·shows·a·transaction·that·raises·the·salary·of·certain
148 employee·numbers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">raise</span><span·class="p"·data-group-id="9105624532-1">(</span><span·class="n">Eno</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p"·data-group-id="9105624532-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">148 employee·numbers:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">raise</span><span·class="p"·data-group-id="4429291843-1">(</span><span·class="n">Eno</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p"·data-group-id="4429291843-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
149 ····</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="9105624532-2">(</span><span·class="p"·data-group-id="9105624532-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">149 ····</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="4429291843-2">(</span><span·class="p"·data-group-id="4429291843-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
150 ················</span><span·class="p"·data-group-id="9105624532-3">[</span><span·class="n">E</span><span·class="p"·data-group-id="9105624532-3">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><sp[·...·truncated·by·diffoscope;·len:·274,·SHA:·d2b693220ef41d113b1d035b875f96ee478e20ebd1cc85a12b93d79760ff7f4a·...·]-4">)</span><span·class="p">,</span><span·class="w">150 ················</span><span·class="p"·data-group-id="4429291843-3">[</span><span·class="n">E</span><span·class="p"·data-group-id="4429291843-3">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><sp[·...·truncated·by·diffoscope;·len:·274,·SHA:·abaa189c599517cbad71e3d5818d290d81fa7dea4ba7c84cef2a7ad824a3d540·...·]-4">)</span><span·class="p">,</span><span·class="w">
151 ················</span><span·class="n">Salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p">.</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p">,</span><span·class="w">151 ················</span><span·class="n">Salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p">.</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p">,</span><span·class="w">
152 ················</span><span·class="n">New</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p"·data-group-id="9105624532-5">{</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Salary</span><span·class="p"·data-group-id="9105624532-5">}</span><span·class="p">,</span><span·class="w">152 ················</span><span·class="n">New</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p"·data-group-id="4429291843-5">{</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Salary</span><span·class="p"·data-group-id="4429291843-5">}</span><span·class="p">,</span><span·class="w">
153 ················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="9105624532-6">(</span><span·class="n">New</span><span·class="p"·data-group-id="9105624532-6">)</span><span·class="w">153 ················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="4429291843-6">(</span><span·class="n">New</span><span·class="p"·data-group-id="4429291843-6">)</span><span·class="w">
154 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">154 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
155 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="9105624532-7">(</span><span·class="n">F</span><span·class="p"·data-group-id="9105624532-7">)</span><span·class="p">.</span></code></pre><p>The·function·<code·class="inline">raise/2</code>·contains·a·Fun·made·up·of·four·code·lines.·This·Fun·is155 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="4429291843-7">(</span><span·class="n">F</span><span·class="p"·data-group-id="4429291843-7">)</span><span·class="p">.</span></code></pre><p>The·function·<code·class="inline">raise/2</code>·contains·a·Fun·made·up·of·four·code·lines.·This·Fun·is
156 called·by·the·statement·<code·class="inline">mnesia:transaction(F)</code>·and·returns·a·value.</p><p>The·<code·class="inline">Mnesia</code>·transaction·system·facilitates·the·construction·of·reliable,156 called·by·the·statement·<code·class="inline">mnesia:transaction(F)</code>·and·returns·a·value.</p><p>The·<code·class="inline">Mnesia</code>·transaction·system·facilitates·the·construction·of·reliable,
157 distributed·systems·by·providing·the·following·important·properties:</p><ul><li>The·transaction·handler·ensures·that·a·Fun,·which·is·placed·inside·a157 distributed·systems·by·providing·the·following·important·properties:</p><ul><li>The·transaction·handler·ensures·that·a·Fun,·which·is·placed·inside·a
158 transaction,·does·not·interfere·with·operations·embedded·in·other·transactions158 transaction,·does·not·interfere·with·operations·embedded·in·other·transactions
159 when·it·executes·a·series·of·operations·on·tables.</li><li>The·transaction·handler·ensures·that·either·all·operations·in·the·transaction159 when·it·executes·a·series·of·operations·on·tables.</li><li>The·transaction·handler·ensures·that·either·all·operations·in·the·transaction
160 are·performed·successfully·on·all·nodes·atomically,·or·the·transaction·fails160 are·performed·successfully·on·all·nodes·atomically,·or·the·transaction·fails
161 without·permanent·effect·on·any·node.</li><li>The·<code·class="inline">Mnesia</code>·transactions·have·four·important·properties,·called·<em>A</em>tomicity,161 without·permanent·effect·on·any·node.</li><li>The·<code·class="inline">Mnesia</code>·transactions·have·four·important·properties,·called·<em>A</em>tomicity,
162 <em>C</em>onsistency,·<em>I</em>solation,·and·<em>D</em>urability·(ACID).·These·properties·are162 <em>C</em>onsistency,·<em>I</em>solation,·and·<em>D</em>urability·(ACID).·These·properties·are
Offset 242, 23 lines modifiedOffset 242, 23 lines modified
242 code·these·operations.</p><p>Deadlocks·can·occur·when·concurrent·processes·set·and·release·locks·on·the·same242 code·these·operations.</p><p>Deadlocks·can·occur·when·concurrent·processes·set·and·release·locks·on·the·same
243 records.·<code·class="inline">Mnesia</code>·employs·a·&quot;wait-die&quot;·strategy·to·resolve·these·situations.·If243 records.·<code·class="inline">Mnesia</code>·employs·a·&quot;wait-die&quot;·strategy·to·resolve·these·situations.·If
244 <code·class="inline">Mnesia</code>·suspects·that·a·deadlock·can·occur·when·a·transaction·tries·to·set·a244 <code·class="inline">Mnesia</code>·suspects·that·a·deadlock·can·occur·when·a·transaction·tries·to·set·a
245 lock,·the·transaction·is·forced·to·release·all·its·locks·and·sleep·for·a·while.245 lock,·the·transaction·is·forced·to·release·all·its·locks·and·sleep·for·a·while.
246 The·Fun·in·the·transaction·is·evaluated·once·more.</p><p>It·is·therefore·important·that·the·code·inside·the·Fun·given·to246 The·Fun·in·the·transaction·is·evaluated·once·more.</p><p>It·is·therefore·important·that·the·code·inside·the·Fun·given·to
247 <a·href="mnesia.html#transaction/1"><code·class="inline">mnesia:transaction/1</code></a>·is·pure.·Some·strange·results·can·occur·if,·for·example,247 <a·href="mnesia.html#transaction/1"><code·class="inline">mnesia:transaction/1</code></a>·is·pure.·Some·strange·results·can·occur·if,·for·example,
248 messages·are·sent·by·the·transaction·Fun.·The·following·example·illustrates·this248 messages·are·sent·by·the·transaction·Fun.·The·following·example·illustrates·this
249 situation:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bad_raise</span><span·class="p"·data-group-id="0356993796-1">(</span><span·class="n">Eno</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p"·data-group-id="0356993796-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">249 situation:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">bad_raise</span><span·class="p"·data-group-id="6605916116-1">(</span><span·class="n">Eno</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p"·data-group-id="6605916116-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
250 ····</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0356993796-2">(</span><span·class="p"·data-group-id="0356993796-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">250 ····</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="6605916116-2">(</span><span·class="p"·data-group-id="6605916116-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
251 ················</span><span·class="p"·data-group-id="0356993796-3">[</span><span·class="n">E</span><span·class="p"·data-group-id="0356993796-3">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><sp[·...·truncated·by·diffoscope;·len:·302,·SHA:·a75fd968212910a1e83123613aa59072516e1a56f6b395b8d29f5c7542052b26·...·]6-4">)</span><span·class="p">,</span><span·class="w">251 ················</span><span·class="p"·data-group-id="6605916116-3">[</span><span·class="n">E</span><span·class="p"·data-group-id="6605916116-3">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><sp[·...·truncated·by·diffoscope;·len:·302,·SHA:·db552a5c64e9f68b79c50ba0fdb38673612bd17f1581f0b10c90ecf354c607c8·...·]6-4">)</span><span·class="p">,</span><span·class="w">
252 ················</span><span·class="n">Salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p">.</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p">,</span><span·class="w">252 ················</span><span·class="n">Salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p">.</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">Raise</span><span·class="p">,</span><span·class="w">
253 ················</span><span·class="n">New</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p"·data-group-id="0356993796-6">{</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Salary</span><span·class="p"·data-group-id="0356993796-6">}</span><span·class="p">,</span><span·class="w">253 ················</span><span·class="n">New</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span·class="o">#</span><span·class="ss">employee</span><span·class="p"·data-group-id="6605916116-6">{</span><span·class="ss">salary</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Salary</span><span·class="p"·data-group-id="6605916116-6">}</span><span·class="p">,</span><span·class="w">
254 ················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0356993796-7">(</span><span·class="s">&quot;Trying·to·write·...·</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0356993796-8">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·64,·SHA:·409d80a6651eaef4f51ffd93129a3275f087ebe6b83387d6b033f5a85b76fc5f·...·]6-7">)</span><span·class="p">,</span><span·class="w">254 ················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6605916116-7">(</span><span·class="s">&quot;Trying·to·write·...·</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6605916116-8">[</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·64,·SHA:·eae304e4dcf08e632b2a3001e29cfb10c8fc2f103f40ad01f701270563fec103·...·]6-7">)</span><span·class="p">,</span><span·class="w">
255 ················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="0356993796-9">(</span><span·class="n">New</span><span·class="p"·data-group-id="0356993796-9">)</span><span·class="w">255 ················</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="6605916116-9">(</span><span·class="n">New</span><span·class="p"·data-group-id="6605916116-9">)</span><span·class="w">
256 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">256 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
257 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="0356993796-10">(</span><span·class="n">F</span><span·class="p"·data-group-id="0356993796-10">)</span><span·class="p">.</span></code></pre><p>This·transaction·can·write·the·text·<code·class="inline">&quot;Trying·to·write·...·&quot;</code>·1000·times·to·the257 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="6605916116-10">(</span><span·class="n">F</span><span·class="p"·data-group-id="6605916116-10">)</span><span·class="p">.</span></code></pre><p>This·transaction·can·write·the·text·<code·class="inline">&quot;Trying·to·write·...·&quot;</code>·1000·times·to·the
258 terminal.·However,·<code·class="inline">Mnesia</code>·guarantees·that·each·transaction·will·eventually258 terminal.·However,·<code·class="inline">Mnesia</code>·guarantees·that·each·transaction·will·eventually
259 run.·As·a·result,·<code·class="inline">Mnesia</code>·is·not·only·deadlock·free,·but·also·livelock·free.</p><p>The·<code·class="inline">Mnesia</code>·programmer·cannot·prioritize·one·particular·transaction·to·execute259 run.·As·a·result,·<code·class="inline">Mnesia</code>·is·not·only·deadlock·free,·but·also·livelock·free.</p><p>The·<code·class="inline">Mnesia</code>·programmer·cannot·prioritize·one·particular·transaction·to·execute
260 before·other·transactions·that·are·waiting·to·execute.·As·a·result,·the·<code·class="inline">Mnesia</code>260 before·other·transactions·that·are·waiting·to·execute.·As·a·result,·the·<code·class="inline">Mnesia</code>
261 DBMS·transaction·system·is·not·suitable·for·hard·real-time·applications.261 DBMS·transaction·system·is·not·suitable·for·hard·real-time·applications.
262 However,·<code·class="inline">Mnesia</code>·contains·other·features·that·have·real-time·properties.</p><p><code·class="inline">Mnesia</code>·dynamically·sets·and·releases·locks·as·transactions·execute.·It·is262 However,·<code·class="inline">Mnesia</code>·contains·other·features·that·have·real-time·properties.</p><p><code·class="inline">Mnesia</code>·dynamically·sets·and·releases·locks·as·transactions·execute.·It·is
263 therefore·dangerous·to·execute·code·with·transaction·side-effects.·In263 therefore·dangerous·to·execute·code·with·transaction·side-effects.·In
264 particular,·a·<code·class="inline">receive</code>·statement·inside·a·transaction·can·lead·to·a·situation264 particular,·a·<code·class="inline">receive</code>·statement·inside·a·transaction·can·lead·to·a·situation
Offset 297, 21 lines modifiedOffset 297, 21 lines modified
297 record·when·reading·a·record,·and·lock·all·replicas·of·a·record·when·writing·a297 record·when·reading·a·record,·and·lock·all·replicas·of·a·record·when·writing·a
298 record.·However,·some·applications·use·<code·class="inline">Mnesia</code>·mainly·for·its·fault-tolerant298 record.·However,·some·applications·use·<code·class="inline">Mnesia</code>·mainly·for·its·fault-tolerant
299 qualities.·These·applications·can·be·configured·with·one·node·doing·all·the299 qualities.·These·applications·can·be·configured·with·one·node·doing·all·the
300 heavy·work,·and·a·standby·node·that·is·ready·to·take·over·if·the·main·node300 heavy·work,·and·a·standby·node·that·is·ready·to·take·over·if·the·main·node
301 fails.·Such·applications·can·benefit·from·using·sticky·locks·instead·of·the301 fails.·Such·applications·can·benefit·from·using·sticky·locks·instead·of·the
302 normal·locking·scheme.</p><p>A·sticky·lock·is·a·lock·that·stays·in·place·at·a·node,·after·the·transaction302 normal·locking·scheme.</p><p>A·sticky·lock·is·a·lock·that·stays·in·place·at·a·node,·after·the·transaction
303 that·first·acquired·the·lock·has·terminated.·To·illustrate·this,·assume·that·the303 that·first·acquired·the·lock·has·terminated.·To·illustrate·this,·assume·that·the
304 following·transaction·is·executed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8664666633-1">(</span><span·class="p"·data-group-id="8664666633-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">304 following·transaction·is·executed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0626848473-1">(</span><span·class="p"·data-group-id="0626848473-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
305 ······</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="8664666633-2">(</span><span·class="o">#</span><span·class="ss">foo</span><span·class="p"·data-group-id="8664666633-3">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">kalle</span><spa[·...·truncated·by·diffoscope;·len:·89,·SHA:·6d012caa9a26355654815f6c31d452109c84b5ac5b560667c903f31060ab94a3·...·]3-2">)</span><span·class="w">305 ······</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="0626848473-2">(</span><span·class="o">#</span><span·class="ss">foo</span><span·class="p"·data-group-id="0626848473-3">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">kalle</span><spa[·...·truncated·by·diffoscope;·len:·89,·SHA:·368d950ecfff63cccf60fe83e62f4d27ad8cf5fa70ecc881bf74ef483de8881d·...·]3-2">)</span><span·class="w">
306 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">306 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
307 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="8664666633-4">(</span><span·class="n">F</span><span·class="p"·data-group-id="8664666633-4">)</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">foo</code>·table·is·replicated·on·the·two·nodes·<code·class="inline">N1</code>·and·<code·cla[·...·truncated·by·diffoscope;·len:·557,·SHA:·81809d7a3e37f485f6938cea65254d3ed56d900844e8548f9e6a9ea7c5443ebd·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">307 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="0626848473-4">(</span><span·class="n">F</span><span·class="p"·data-group-id="0626848473-4">)</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">foo</code>·table·is·replicated·on·the·two·nodes·<code·class="inline">N1</code>·and·<code·cla[·...·truncated·by·diffoscope;·len:·557,·SHA:·902df33a609cb322f5d19d9f71f7d5f6874798e77d7c2874ea100f360626e575·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
308 ······</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">s_write</span><span·class="p"·data-group-id="2195460446-2">(</span><span·class="o">#</span><span·class="ss">foo</span><span·class="p"·data-group-id="2195460446-3">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">kalle</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·33dbfded9e1a427cf1ac0f1e4a5f8e74070f2793b08393f98100223521d41c12·...·]-2">)</span><span·class="w">308 ······</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">s_write</span><span·class="p"·data-group-id="8382415843-2">(</span><span·class="o">#</span><span·class="ss">foo</span><span·class="p"·data-group-id="8382415843-3">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">kalle</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·57303b87714f3e59fb2ae7982f0b802d9f73d18f6f6f8618a4096c95ec12bd57·...·]-2">)</span><span·class="w">
309 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">309 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
310 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="2195460446-4">(</span><span·class="n">F</span><span·class="p"·data-group-id="2195460446-4">)</span><span·class="p">.</span></code></pre><p>This·code·uses·the·function·<a·href="mnesia.html#s_write/1"><code·class="inline">s_write/1</code></a>·instead·of·the310 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">transaction</span><span·class="p"·data-group-id="8382415843-4">(</span><span·class="n">F</span><span·class="p"·data-group-id="8382415843-4">)</span><span·class="p">.</span></code></pre><p>This·code·uses·the·function·<a·href="mnesia.html#s_write/1"><code·class="inline">s_write/1</code></a>·instead·of·the
311 function·<a·href="mnesia.html#write/1"><code·class="inline">write/1</code></a>·The·function·<code·class="inline">s_write/1</code>·sets·a·sticky·lock311 function·<a·href="mnesia.html#write/1"><code·class="inline">write/1</code></a>·The·function·<code·class="inline">s_write/1</code>·sets·a·sticky·lock
312 instead·of·a·normal·lock.·If·the·table·is·not·replicated,·sticky·locks·have·no312 instead·of·a·normal·lock.·If·the·table·is·not·replicated,·sticky·locks·have·no
313 special·effect.·If·the·table·is·replicated,·and·a·sticky·lock·is·set·on·node313 special·effect.·If·the·table·is·replicated,·and·a·sticky·lock·is·set·on·node
314 <code·class="inline">N1</code>,·this·lock·then·sticks·to·node·<code·class="inline">N1</code>.·The·next·time·you·try·to·set·a·sticky314 <code·class="inline">N1</code>,·this·lock·then·sticks·to·node·<code·class="inline">N1</code>.·The·next·time·you·try·to·set·a·sticky
315 lock·on·the·same·record·at·node·<code·class="inline">N1</code>,·<code·class="inline">Mnesia</code>·detects·that·the·lock·is·already315 lock·on·the·same·record·at·node·<code·class="inline">N1</code>,·<code·class="inline">Mnesia</code>·detects·that·the·lock·is·already
316 set·and·do·no·network·operation·to·acquire·the·lock.</p><p>It·is·more·efficient·to·set·a·local·lock·than·it·is·to·set·a·networked·lock.316 set·and·do·no·network·operation·to·acquire·the·lock.</p><p>It·is·more·efficient·to·set·a·local·lock·than·it·is·to·set·a·networked·lock.
317 Sticky·locks·can·therefore·benefit·an·application·that·uses·a·replicated·table317 Sticky·locks·can·therefore·benefit·an·application·that·uses·a·replicated·table
Offset 329, 16 lines modifiedOffset 329, 16 lines modified
329 locks·automatically,·and·the·programmer·does·not·need·to·code·these·operations.329 locks·automatically,·and·the·programmer·does·not·need·to·code·these·operations.
330 However,·transactions·that·read·and·write·many·records·in·a·specific·table330 However,·transactions·that·read·and·write·many·records·in·a·specific·table
331 execute·more·efficiently·if·the·transaction·is·started·by·setting·a·table·lock331 execute·more·efficiently·if·the·transaction·is·started·by·setting·a·table·lock
332 on·this·table.·This·blocks·other·concurrent·transactions·from·the·table.·The332 on·this·table.·This·blocks·other·concurrent·transactions·from·the·table.·The
333 following·two·functions·are·used·to·set·explicit·table·locks·for·read·and·write333 following·two·functions·are·used·to·set·explicit·table·locks·for·read·and·write
334 operations:</p><ul><li><a·href="mnesia.html#read_lock_table/1"><code·class="inline">mnesia:read_lock_table(Tab)</code></a>·sets·a·read·lock·on334 operations:</p><ul><li><a·href="mnesia.html#read_lock_table/1"><code·class="inline">mnesia:read_lock_table(Tab)</code></a>·sets·a·read·lock·on
335 table·<code·class="inline">Tab</code>.</li><li><a·href="mnesia.html#write_lock_table/1"><code·class="inline">mnesia:write_lock_table(Tab)</code></a>·sets·a·write·lock335 table·<code·class="inline">Tab</code>.</li><li><a·href="mnesia.html#write_lock_table/1"><code·class="inline">mnesia:write_lock_table(Tab)</code></a>·sets·a·write·lock
336 on·table·<code·class="inline">Tab</code>.</li></ul><p>Alternative·syntax·for·acquisition·of·table·locks·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="4433925609-1">(</span><span·class="p"·data-group-id="4433925609-2">{</span><span·class="ss">table</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p"·data-group-id="4433925609-2">}</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">read</span><span·class="p"·data-group-id="4433925609-1">)</span><span·class="w"> 
337 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="4433925609-3">(</span><span·class="p"·data-group-id="4433925609-4">{</span><span·class="ss">table</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·345,·SHA:·9f462f146eb70b2e886d7777830c148541dd3816d32ba4325201952bac9ff276·...·]336 on·table·<code·class="inline">Tab</code>.</li></ul><p>Alternative·syntax·for·acquisition·of·table·locks·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><spa[·...·truncated·by·diffoscope;·len:·403,·SHA:·e24db5373dbf219e081ac846ef60d65c6d8bb151de9c5ee56ee08268f73497b5·...·]
 337 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">lock</span><span·class="p"·data-group-id="0609416447-3">(</span><span·class="p"·data-group-id="0609416447-4">{</span><span·class="ss">table</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p"·data-group-id="0609416447-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">write</span><span·class="p"·data-group-id="0609416447-3">)</span></code></pre><p>The·matching·operations·in·<code·class="inline">Mnesia</code>·can·either·lock·the·entire·table·or·only·a
338 single·record·(when·the·key·is·bound·in·the·pattern).</p><h3·id="global-locks"·class="section-heading">338 single·record·(when·the·key·is·bound·in·the·pattern).</p><h3·id="global-locks"·class="section-heading">
339 ··<a·href="#global-locks"·class="hover-link">339 ··<a·href="#global-locks"·class="hover-link">
340 ····<i·class="ri-link-m"·aria-hidden="true"></i>340 ····<i·class="ri-link-m"·aria-hidden="true"></i>
341 ··</a>341 ··</a>
342 ··<span·class="text">Global·Locks</span>342 ··<span·class="text">Global·Locks</span>
343 </h3>343 </h3>
344 <p>Write·locks·are·normally·acquired·on·all·nodes·where·a·replica·of·the·table344 <p>Write·locks·are·normally·acquired·on·all·nodes·where·a·replica·of·the·table
Offset 421, 86 lines modifiedOffset 421, 86 lines modified
421 ··<span·class="text">Record·Names·versus·Table·Names</span>421 ··<span·class="text">Record·Names·versus·Table·Names</span>
422 </h2>422 </h2>
423 <p>In·<code·class="inline">Mnesia</code>,·all·records·in·a·table·must·have·the·same·name.·All·the·records423 <p>In·<code·class="inline">Mnesia</code>,·all·records·in·a·table·must·have·the·same·name.·All·the·records
424 must·be·instances·of·the·same·record·type.·The·record·name,·however,·does·not424 must·be·instances·of·the·same·record·type.·The·record·name,·however,·does·not
425 necessarily·have·to·be·the·same·as·the·table·name,·although·this·is·the·case·in425 necessarily·have·to·be·the·same·as·the·table·name,·although·this·is·the·case·in
426 most·of·the·examples·in·this·User's·Guide.·If·a·table·is·created·without426 most·of·the·examples·in·this·User's·Guide.·If·a·table·is·created·without
427 property·<code·class="inline">record_name</code>,·the·following·code·ensures·that·all·records·in·the427 property·<code·class="inline">record_name</code>,·the·following·code·ensures·that·all·records·in·the
428 tables·have·the·same·name·as·the·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="6304083100-1">(</span><span·class="ss">subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6304083100-2">[</span><span·class="p"·data-group-id="6304083100-2">]</span><span·class="p"·data-group-id="6304083100-1">)</span></code></pre><p>However,·if·the·table·is·created·with·an·explicit·record·name·as·argument,·as428 tables·have·the·same·name·as·the·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3841667717-1">(</span><span·class="ss">subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3841667717-2">[</span><span·class="p"·data-group-id="3841667717-2">]</span><span·class="p"·data-group-id="3841667717-1">)</span></code></pre><p>However,·if·the·table·is·created·with·an·explicit·record·name·as·argument,·as
429 shown·in·the·following·example,·subscriber·records·can·be·stored·in·both·of·the429 shown·in·the·following·example,·subscriber·records·can·be·stored·in·both·of·the
430 tables·regardless·of·the·table·names:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">TabDef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1413792690-1">[</span><span·class="p"·data-group-id="1413792690-2">{</span><span·class="ss">record_name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="1413792690-2">}</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·9ddeff3fdafaee6ecd7c4d9a51d941a9c035960f14d3acefb275dfe23ffc9264·...·]-1">]</span><span·class="p">,</span><span·class="w">430 tables·regardless·of·the·table·names:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">TabDef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4344401274-1">[</span><span·class="p"·data-group-id="4344401274-2">{</span><span·class="ss">record_name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="4344401274-2">}</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·ebd3c585adeabc7610c074dbe4c19dd2354102114e964ab68e0291b7b234e228·...·]-1">]</span><span·class="p">,</span><span·class="w">
431 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1413792690-3">(</span><span·class="ss">my_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabDef</span><span·class="p"·data-group-id="1413792690-3">)</span><span·class="p">,</span><span·class="w">431 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="4344401274-3">(</span><span·class="ss">my_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabDef</span><span·class="p"·data-group-id="4344401274-3">)</span><span·class="p">,</span><span·class="w">
432 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1413792690-4">(</span><span·class="ss">your_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabDef</span><span·class="p"·data-group-id="1413792690-4">)</span><span·class="p">.</span></code></pre><p>To·access·such·tables,·simplified·access·functions·(as·described·earlier)·cannot432 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="4344401274-4">(</span><span·class="ss">your_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabDef</span><span·class="p"·data-group-id="4344401274-4">)</span><span·class="p">.</span></code></pre><p>To·access·such·tables,·simplified·access·functions·(as·described·earlier)·cannot
433 be·used.·For·example,·writing·a·subscriber·record·into·a·table·requires·the433 be·used.·For·example,·writing·a·subscriber·record·into·a·table·requires·the
434 function·<a·href="mnesia.html#write/3"><code·class="inline">mnesia:write/3</code></a>·instead·of·the·simplified·functions·<a·href="mnesia.html#write/1"><code·class="inline">mnesia:write/1</code></a>434 function·<a·href="mnesia.html#write/3"><code·class="inline">mnesia:write/3</code></a>·instead·of·the·simplified·functions·<a·href="mnesia.html#write/1"><code·class="inline">mnesia:write/1</code></a>
435 and·<a·href="mnesia.html#s_write/1"><code·class="inline">mnesia:s_write/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="1826215729-1">(</span><span·class="ss">subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="1826215729-2">{</span><span·class="p"·data-group-id="1826215729[·...·truncated·by·diffoscope;·len:·130,·SHA:·400ff59582112c527fb9f12496870dcf1897411d28f7dec4fe959002cc2ff965·...·]-1">)</span><span·class="w">435 and·<a·href="mnesia.html#s_write/1"><code·class="inline">mnesia:s_write/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="3865937292-1">(</span><span·class="ss">subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="3865937292-2">{</span><span·class="p"·data-group-id="3865937292[·...·truncated·by·diffoscope;·len:·130,·SHA:·79ebb2722fb22df3be3dcd9d6bc70638dff77e6eb66c62f47b6023455830b268·...·]-1">)</span><span·class="w">
436 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="1826215729-3">(</span><span·class="ss">my_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="1826215729-4">{</span><span·class="p"·data-group-id="1826215[·...·truncated·by·diffoscope;·len:·140,·SHA:·ffba30010993b00969b0b7a315a9769f79a34d6c7fbaaa9ffe52a30a77d34186·...·]-3">)</span><span·class="w">436 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="3865937292-3">(</span><span·class="ss">my_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="3865937292-4">{</span><span·class="p"·data-group-id="3865937[·...·truncated·by·diffoscope;·len:·140,·SHA:·01e734b7fa7c8dc29d94c24ae752096b24521a36831f6e25f486478b89e9b0ea·...·]-3">)</span><span·class="w">
437 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="1826215729-5">(</span><span·class="ss">your_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="1826215729-6">{</span><span·class="p"·data-group-id="18262[·...·truncated·by·diffoscope;·len:·135,·SHA:·2b863da6ba17fbeae59884ed3ac69d4ea3060777f78f2c0e4557c4f8e288f770·...·]-5">)</span></code></pre><p>The·following·simple·code·illustrates·the·relationship·between·the·simplified437 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="3865937292-5">(</span><span·class="ss">your_subscriber</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">subscriber</span><span·class="p"·data-group-id="3865937292-6">{</span><span·class="p"·data-group-id="38659[·...·truncated·by·diffoscope;·len:·135,·SHA:·df4d840b8cf3471b8ddbf03e9ecd6759758a44fe89f191e848efbb069a263b57·...·]-5">)</span></code></pre><p>The·following·simple·code·illustrates·the·relationship·between·the·simplified
438 access·functions·used·in·most·of·the·examples·and·their·more·flexible438 access·functions·used·in·most·of·the·examples·and·their·more·flexible
439 counterparts:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_write</span><span·class="p"·data-group-id="7793697327-1">(</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">439 counterparts:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_write</span><span·class="p"·data-group-id="1406704182-1">(</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
440 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="7793697327-2">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-2">)</span><span·class="p">,</span><span·class="w">440 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="1406704182-2">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-2">)</span><span·class="p">,</span><span·class="w">
441 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_write</span><span·class="p"·data-group-id="7793697327-3">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-3">)</span><span·class="p">.</span><span·class="w">441 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_write</span><span·class="p"·data-group-id="1406704182-3">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-3">)</span><span·class="p">.</span><span·class="w">
  
442 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete</span><span·class="p"·data-group-id="7793697327-4">(</span><span·class="p"·data-group-id="7793697327-5">{</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7793697327-5">}</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·5d8c71eb8943ed3797ae811f7829d7369a03698a803feaecaaf70620b0814bb1·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">442 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete</span><span·class="p"·data-group-id="1406704182-4">(</span><span·class="p"·data-group-id="1406704182-5">{</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="1406704182-5">}</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·505561dd0a4bd03496b2a666005001990bca1624506f997d74b8008357143c86·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
443 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete</span><span·class="p"·data-group-id="7793697327-6">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7793697327-6">)</span><span·class="p">.</span><span·class="w">443 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete</span><span·class="p"·data-group-id="1406704182-6">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="1406704182-6">)</span><span·class="p">.</span><span·class="w">
  
444 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete_object</span><span·class="p"·data-group-id="7793697327-7">(</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">444 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete_object</span><span·class="p"·data-group-id="1406704182-7">(</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
445 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="7793697327-8">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-8">)</span><span·class="p">,</span><span·class="w">445 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="1406704182-8">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-8">)</span><span·class="p">,</span><span·class="w">
446 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete_object</span><span·class="p"·data-group-id="7793697327-9">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-9">)</span><span·class="w">446 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_delete_object</span><span·class="p"·data-group-id="1406704182-9">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-9">)</span><span·class="w">
  
447 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_update_counter</span><span·class="p"·data-group-id="7793697327-10">(</span><span·class="p"·data-group-id="7793697327-11">{</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7793697327-11">}</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·91,·SHA:·eed8da923ec953e69fbcf0594036de1defd1ed06b2630a1d7b5062837d6f67ac·...·]-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">447 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_update_counter</span><span·class="p"·data-group-id="1406704182-10">(</span><span·class="p"·data-group-id="1406704182-11">{</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="1406704182-11">}</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·91,·SHA:·52e0983f6598c569943dc40be6afac370af59adac806963f85a70328825d97d5·...·]-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
448 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_update_counter</span><span·class="p"·data-group-id="7793697327-12">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Incr</span><span·class="p"·data-group-id="7793697327-12">)</span><span·class="p">.</span><span·class="w">448 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_update_counter</span><span·class="p"·data-group-id="1406704182-12">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Incr</span><span·class="p"·data-group-id="1406704182-12">)</span><span·class="p">.</span><span·class="w">
  
449 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_read</span><span·class="p"·data-group-id="7793697327-13">(</span><span·class="p"·data-group-id="7793697327-14">{</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7793697327-14">}</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·cfe974b125cb47ae0049c7b522f6d5483647150e55a89645a51da02471dec58f·...·]-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">449 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_read</span><span·class="p"·data-group-id="1406704182-13">(</span><span·class="p"·data-group-id="1406704182-14">{</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="1406704182-14">}</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·5746cf0397e4edd9c20aaa97bb39cc7881ff8059301405800e26b62585b3fb60·...·]-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
450 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="7793697327-15">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="7793697327-15">)</span><span·class="p">,</span><span·class="w">450 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="1406704182-15">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Record</span><span·class="p"·data-group-id="1406704182-15">)</span><span·class="p">,</span><span·class="w">
451 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_read</span><span·class="p"·data-group-id="7793697327-16">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="7793697327-16">)</span><span·class="p">.</span><span·class="w">451 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_read</span><span·class="p"·data-group-id="1406704182-16">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Key</span><span·class="p"·data-group-id="1406704182-16">)</span><span·class="p">.</span><span·class="w">
  
452 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_match_object</span><span·class="p"·data-group-id="7793697327-17">(</span><span·class="n">Pattern</span><span·class="p"·data-group-id="7793697327-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">452 </span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_match_object</span><span·class="p"·data-group-id="1406704182-17">(</span><span·class="n">Pattern</span><span·class="p"·data-group-id="1406704182-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
453 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="7793697327-18">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pattern</span><span·class="p"·data-group-id="7793697327-18">)</span><span·class="p">,</span><span·class="w">453 ··</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">element</span><span·class="p"·data-group-id="1406704182-18">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pattern</span><span·class="p"·data-group-id="1406704182-18">)</span><span·class="p">,</span><span·class="w">
454 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_match_object</span><span·class="p"·data-group-id="7793697327-19">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pattern</span><span·class="p"·data-group-id="7793697327-19">)</span><span·class="p">.</span><span·class="w">454 ··</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">dirty_match_object</span><span·class="p"·data-group-id="1406704182-19">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pattern</span><span·class="p"·data-group-id="1406704182-19">)</span><span·class="p">.</span><span·class="w">
  
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163 different·Erlang·nodes·in·various·ways.·The·<code·class="inline">Mnesia</code>·programmer·does·not·need·to163 different·Erlang·nodes·in·various·ways.·The·<code·class="inline">Mnesia</code>·programmer·does·not·need·to
164 state·where·the·different·tables·reside,·only·the·names·of·the·different·tables164 state·where·the·different·tables·reside,·only·the·names·of·the·different·tables
165 need·to·be·specified·in·the·program·code.·This·is·known·as·&quot;location165 need·to·be·specified·in·the·program·code.·This·is·known·as·&quot;location
166 transparency&quot;·and·is·an·important·concept.·In·particular:</p><ul><li><p>A·program·works·regardless·of·the·data·location.·It·makes·no·difference166 transparency&quot;·and·is·an·important·concept.·In·particular:</p><ul><li><p>A·program·works·regardless·of·the·data·location.·It·makes·no·difference
167 whether·the·data·resides·on·the·local·node·or·on·a·remote·node.</p><p>Notice·that·the·program·runs·slower·if·the·data·is·located·on·a·remote·node.</p></li><li><p>The·database·can·be·reconfigured,·and·tables·can·be·moved·between·nodes.·These167 whether·the·data·resides·on·the·local·node·or·on·a·remote·node.</p><p>Notice·that·the·program·runs·slower·if·the·data·is·located·on·a·remote·node.</p></li><li><p>The·database·can·be·reconfigured,·and·tables·can·be·moved·between·nodes.·These
168 operations·do·not·affect·the·user·programs.</p></li></ul><p>It·has·previously·been·shown·that·each·table·has·a·number·of·system·attributes,168 operations·do·not·affect·the·user·programs.</p></li></ul><p>It·has·previously·been·shown·that·each·table·has·a·number·of·system·attributes,
169 such·as·<code·class="inline">index</code>·and·<code·class="inline">type</code>.</p><p>Table·attributes·are·specified·when·the·table·is·created.·For·example,·the169 such·as·<code·class="inline">index</code>·and·<code·class="inline">type</code>.</p><p>Table·attributes·are·specified·when·the·table·is·created.·For·example,·the
170 following·function·creates·a·table·with·two·RAM·replicas:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="6309781756-1">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">170 following·function·creates·a·table·with·two·RAM·replicas:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="7304495756-1">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">
171 ····················</span><span·class="p"·data-group-id="6309781756-2">[</span><span·class="p"·data-group-id="6309781756-3">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6309781756-4">[</span><span·class="n">N1</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·143,·SHA:·48b5049eb367be35e11bb113a2eb020c933ee33a69e33507b9e2eb8a533ca702·...·]756-3">}</span><span·class="p">,</span><span·class="w">171 ····················</span><span·class="p"·data-group-id="7304495756-2">[</span><span·class="p"·data-group-id="7304495756-3">{</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7304495756-4">[</span><span·class="n">N1</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·143,·SHA:·fa92f97518e377a4b9aa6fd954a8acf67a2922662ee9345e035d568f5d786bc1·...·]756-3">}</span><span·class="p">,</span><span·class="w">
172 ·····················</span><span·class="p"·data-group-id="6309781756-5">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="6309781756-6">(</span><span·class="ss">fields</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·238,·SHA:·bb845730ebcd0ff2d379c05294ec82f28bcd2c61ac959f7a63a98645c269eeb0·...·]756-1">)</span><span·class="p">.</span></code></pre><p>Tables·can·also·have·the·following·properties,·where·each·attribute·has·a·list172 ·····················</span><span·class="p"·data-group-id="7304495756-5">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">record_info</span><span·class="p"·data-group-id="7304495756-6">(</span><span·class="ss">fields</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·238,·SHA:·63cfef8cc4956d8aaccbc8e6aee0cb41de3db6e382fe2dd5c9244bd42c67c5bb·...·]756-1">)</span><span·class="p">.</span></code></pre><p>Tables·can·also·have·the·following·properties,·where·each·attribute·has·a·list
173 of·Erlang·nodes·as·its·value:</p><ul><li><p><code·class="inline">ram_copies</code>.·The·value·of·the·node·list·is·a·list·of·Erlang·nodes,·and·a·RAM173 of·Erlang·nodes·as·its·value:</p><ul><li><p><code·class="inline">ram_copies</code>.·The·value·of·the·node·list·is·a·list·of·Erlang·nodes,·and·a·RAM
174 replica·of·the·table·resides·on·each·node·in·the·list.</p><p>Notice·that·no·disc·operations·are·performed·when·a·program·executes·write174 replica·of·the·table·resides·on·each·node·in·the·list.</p><p>Notice·that·no·disc·operations·are·performed·when·a·program·executes·write
175 operations·to·these·replicas.·However,·if·permanent·RAM·replicas·are·required,175 operations·to·these·replicas.·However,·if·permanent·RAM·replicas·are·required,
176 the·following·alternatives·are·available:</p><ol><li>The·function·<a·href="mnesia.html#dump_tables/1"><code·class="inline">mnesia:dump_tables/1</code></a>·can·be·used·to·dump·RAM·table·replicas176 the·following·alternatives·are·available:</p><ol><li>The·function·<a·href="mnesia.html#dump_tables/1"><code·class="inline">mnesia:dump_tables/1</code></a>·can·be·used·to·dump·RAM·table·replicas
177 to·disc.</li><li>The·table·replicas·can·be·backed·up,·either·from·RAM,·or·from·disc·if177 to·disc.</li><li>The·table·replicas·can·be·backed·up,·either·from·RAM,·or·from·disc·if
178 dumped·there·with·this·function.</li></ol></li><li><p><code·class="inline">disc_copies</code>.·The·value·of·the·attribute·is·a·list·of·Erlang·nodes,·and·a178 dumped·there·with·this·function.</li></ol></li><li><p><code·class="inline">disc_copies</code>.·The·value·of·the·attribute·is·a·list·of·Erlang·nodes,·and·a
179 replica·of·the·table·resides·both·in·RAM·and·on·disc·on·each·node·in·the·list.179 replica·of·the·table·resides·both·in·RAM·and·on·disc·on·each·node·in·the·list.
Offset 218, 60 lines modifiedOffset 218, 60 lines modified
218 <code·class="inline">mnesia_frag</code>·can·be·used·as·a·<code·class="inline">mnesia_access</code>·callback·module.</p><p>At·each·record·access,·<code·class="inline">mnesia_frag</code>·first·computes·a·hash·value·from·the·record218 <code·class="inline">mnesia_frag</code>·can·be·used·as·a·<code·class="inline">mnesia_access</code>·callback·module.</p><p>At·each·record·access,·<code·class="inline">mnesia_frag</code>·first·computes·a·hash·value·from·the·record
219 key.·Second,·the·name·of·the·table·fragment·is·determined·from·the·hash·value.219 key.·Second,·the·name·of·the·table·fragment·is·determined·from·the·hash·value.
220 Finally·the·actual·table·access·is·performed·by·the·same·functions·as·for220 Finally·the·actual·table·access·is·performed·by·the·same·functions·as·for
221 non-fragmented·tables.·When·the·key·is·not·known·beforehand,·all·fragments·are221 non-fragmented·tables.·When·the·key·is·not·known·beforehand,·all·fragments·are
222 searched·for·matching·records.</p><p>Notice·that·in·<code·class="inline">ordered_set</code>·tables,·the·records·are·ordered·per·fragment,·and222 searched·for·matching·records.</p><p>Notice·that·in·<code·class="inline">ordered_set</code>·tables,·the·records·are·ordered·per·fragment,·and
223 the·order·is·undefined·in·results·returned·by·<code·class="inline">select</code>·and·<code·class="inline">match_object</code>,·as223 the·order·is·undefined·in·results·returned·by·<code·class="inline">select</code>·and·<code·class="inline">match_object</code>,·as
224 well·as·<code·class="inline">first</code>,·<code·class="inline">next</code>,·<code·class="inline">prev</code>·and·<code·class="inline">last</code>.</p><p>The·following·code·illustrates·how·a·<code·class="inline">Mnesia</code>·table·is·converted·to·be·a224 well·as·<code·class="inline">first</code>,·<code·class="inline">next</code>,·<code·class="inline">prev</code>·and·<code·class="inline">last</code>.</p><p>The·following·code·illustrates·how·a·<code·class="inline">Mnesia</code>·table·is·converted·to·be·a
225 fragmented·table·and·how·more·fragments·are·added·later:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-1">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><spa[·...·truncated·by·diffoscope;·len:·398,·SHA:·05d71503825f190468a23129c2cb2c76de3a4624fdadea0a0ef9555304abda48·...·]-1">)</span><span·class="gp·unselectable">225 fragmented·table·and·how·more·fragments·are·added·later:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-1">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><spa[·...·truncated·by·diffoscope;·len:·398,·SHA:·cd247242bbbb7efb6fca4e960e0d62034d735aece29648d41eb17b2f42e0c774·...·]-1">)</span><span·class="gp·unselectable">
226 (a@sam)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="7391169329-3">(</span><span·class="p"·data-group-id="7391169329-3">)</span><span·class="p">.</span><span·class="w">226 (a@sam)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="7870106360-3">(</span><span·class="p"·data-group-id="7870106360-3">)</span><span·class="p">.</span><span·class="w">
227 </span><span·class="nf">ok</span><span·class="w">227 </span><span·class="nf">ok</span><span·class="w">
228 </span><span·class="p"·data-group-id="7391169329-4">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7391169329-4">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">system[·...·truncated·by·diffoscope;·len:·146,·SHA:·1f864585df6b98a7642e0256688da7f25f71ef58c932c623109f7ad3145f7945·...·]-5">)</span><span·class="p">.</span><span·class="w">228 </span><span·class="p"·data-group-id="7870106360-4">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7870106360-4">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">system[·...·truncated·by·diffoscope;·len:·146,·SHA:·349b6fa4180c15f8380a21677c605effe9ad5c8a7fedc4bc69d15e5e13186d84·...·]-5">)</span><span·class="p">.</span><span·class="w">
229 </span><span·class="p"·data-group-id="7391169329-6">[</span><span·class="ss">b@sam</span><span·class="p">,</span><span·class="ss">c@sam</span><span·class="p">,</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7391169329-6">]</span><span·class="gp·unselectable">229 </span><span·class="p"·data-group-id="7870106360-6">[</span><span·class="ss">b@sam</span><span·class="p">,</span><span·class="ss">c@sam</span><span·class="p">,</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7870106360-6">]</span><span·class="gp·unselectable">
230 (a@sam)3&gt;·</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">dictionary</span><span·class="p">.</span><span·class="w">230 (a@sam)3&gt;·</span><span·class="n">Tab</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">dictionary</span><span·class="p">.</span><span·class="w">
231 </span><span·class="nf">dictionary</span><span·class="w">231 </span><span·class="nf">dictionary</span><span·class="w">
232 </span><span·class="p"·data-group-id="7391169329-7">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7391169329-7">)</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create[·...·truncated·by·diffoscope;·len:·691,·SHA:·1c8a9d50edbb7f712141dfdeff51175367efd177cda67cc679cb572435c76ec0·...·]-8">)</span><span·class="p">.</span><span·class="w">232 </span><span·class="p"·data-group-id="7870106360-7">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7870106360-7">)</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create[·...·truncated·by·diffoscope;·len:·691,·SHA:·0392111edb5823da5c1342f813578363395b35a8144a1c96e63e705fd4e3f4da·...·]-8">)</span><span·class="p">.</span><span·class="w">
233 </span><span·class="p"·data-group-id="7391169329-12">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7391169329-12">}</span><span·class="gp·unselectable">233 </span><span·class="p"·data-group-id="7870106360-12">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7870106360-12">}</span><span·class="gp·unselectable">
234 (a@sam)5&gt;·</span><span·class="n">Write</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7391169329-13">(</span><span·class="n">Keys</span><span·class="p"·data-group-id="7391169329-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-14">[</span><span·class="nc">mnesia[·...·truncated·by·diffoscope;·len:·663,·SHA:·5c0ac5662482d300e8881c1e8c9d265bb0917225ff8b17d7497aa40a6b91526e·...·]-14">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">234 (a@sam)5&gt;·</span><span·class="n">Write</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7870106360-13">(</span><span·class="n">Keys</span><span·class="p"·data-group-id="7870106360-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-14">[</span><span·class="nc">mnesia[·...·truncated·by·diffoscope;·len:·663,·SHA:·b62b89211591d87df6a10f1c2490df38dc496b26c2cfc4f314b25b0fff929a0c·...·]-14">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
235 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">235 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">
236 (a@sam)6&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7391169329-17">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-18">[</span><span·class="nc">lists[·...·truncated·by·diffoscope;·len:·444,·SHA:·547a2f884b5532652477f47a1d9720842d9ca9172a37673e1b37eb1cc385cc4c·...·]-17">)</span><span·class="p">.</span><span·class="w">236 (a@sam)6&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7870106360-17">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-18">[</span><span·class="nc">lists[·...·truncated·by·diffoscope;·len:·444,·SHA:·5c17f865467a4e0d495730376469a432aab8e6bce3e480fee2e0a03c2feb07d8·...·]-17">)</span><span·class="p">.</span><span·class="w">
237 </span><span·class="nf">ok</span><span·class="w">237 </span><span·class="nf">ok</span><span·class="w">
238 </span><span·class="p"·data-group-id="7391169329-20">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7391169329-20">)</span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">chan[·...·truncated·by·diffoscope;·len:·485,·SHA:·22fa22b0eebc04b5c70a0d8d68a2ae9f8b2c4e04ced81e3e152ce7e087e927f8·...·]-21">)</span><span·class="p">.</span><span·class="w">238 </span><span·class="p"·data-group-id="7870106360-20">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7870106360-20">)</span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">chan[·...·truncated·by·diffoscope;·len:·485,·SHA:·ed2d8bfb270d18ba29954f563b4aed30cce43a55068bbdae4188f2cb1aae0e2e·...·]-21">)</span><span·class="p">.</span><span·class="w">
239 </span><span·class="p"·data-group-id="7391169329-24">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7391169329-24">}</span><span·class="gp·unselectable">239 </span><span·class="p"·data-group-id="7870106360-24">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7870106360-24">}</span><span·class="gp·unselectable">
240 (a@sam)8&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">table_info</span><span·class="p"·data-group-id="7391169329-25">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">frag_properties</span><span·class="p"·data-group-id="7391169329-25">)</span><span·class="p">.</span><span·class="w">240 (a@sam)8&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">table_info</span><span·class="p"·data-group-id="7870106360-25">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">frag_properties</span><span·class="p"·data-group-id="7870106360-25">)</span><span·class="p">.</span><span·class="w">
241 </span><span·class="p"·data-group-id="7391169329-26">[</span><span·class="p"·data-group-id="7391169329-27">{</span><span·class="ss">base_table</span><span·class="p">,</span><span·class="ss">dictionary</span><span·class="p"·data-group-id="7391169329-27">}</span><span·class="p">,</span><span·class="w">241 </span><span·class="p"·data-group-id="7870106360-26">[</span><span·class="p"·data-group-id="7870106360-27">{</span><span·class="ss">base_table</span><span·class="p">,</span><span·class="ss">dictionary</span><span·class="p"·data-group-id="7870106360-27">}</span><span·class="p">,</span><span·class="w">
242 ·</span><span·class="p"·data-group-id="7391169329-28">{</span><span·class="ss">foreign_key</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="7391169329-28">}</span><span·class="p">,</span><span·class="w">242 ·</span><span·class="p"·data-group-id="7870106360-28">{</span><span·class="ss">foreign_key</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="7870106360-28">}</span><span·class="p">,</span><span·class="w">
243 ·</span><span·class="p"·data-group-id="7391169329-29">{</span><span·class="ss">hash_module</span><span·class="p">,</span><span·class="ss">mnesia_frag_hash</span><span·class="p"·data-group-id="7391169329-29">}</span><span·class="p">,</span><span·class="w">243 ·</span><span·class="p"·data-group-id="7870106360-29">{</span><span·class="ss">hash_module</span><span·class="p">,</span><span·class="ss">mnesia_frag_hash</span><span·class="p"·data-group-id="7870106360-29">}</span><span·class="p">,</span><span·class="w">
244 ·</span><span·class="p"·data-group-id="7391169329-30">{</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="p"·data-group-id="7391169329-31">{</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·208,·SHA:·2986ee294e1ec82589ed38925fcd61c62dfc8283ec4ec2f6c5c8b213758247da·...·]-30">}</span><span·class="p">,</span><span·class="w">244 ·</span><span·class="p"·data-group-id="7870106360-30">{</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="p"·data-group-id="7870106360-31">{</span><span·class="ss">hash_state</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·208,·SHA:·957f5ec8fddd08f14d54a3b569d67e915b5c136d7b3b283f0bbb8fb7a0b4c393·...·]-30">}</span><span·class="p">,</span><span·class="w">
245 ·</span><span·class="p"·data-group-id="7391169329-32">{</span><span·class="ss">n_fragments</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="7391169329-32">}</span><span·class="p">,</span><span·class="w">245 ·</span><span·class="p"·data-group-id="7870106360-32">{</span><span·class="ss">n_fragments</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="7870106360-32">}</span><span·class="p">,</span><span·class="w">
246 ·</span><span·class="p"·data-group-id="7391169329-33">{</span><span·class="ss">node_pool</span><span·class="p">,</span><span·class="p"·data-group-id="7391169329-34">[</span><span·class="ss">a@sam</span><span·class="p">,</span><span·class="ss">b@sam</span><span·class="p">,</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·161,·SHA:·f6b4c01f719a1451e1f1a53de8eb87d999937468c4c2ad05b9d92cf2a6b19cb9·...·]-26">]</span><span·class="gp·unselectable">246 ·</span><span·class="p"·data-group-id="7870106360-33">{</span><span·class="ss">node_pool</span><span·class="p">,</span><span·class="p"·data-group-id="7870106360-34">[</span><span·class="ss">a@sam</span><span·class="p">,</span><span·class="ss">b@sam</span><span·class="p">,</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·161,·SHA:·e187fcf661734eba506dd7591cf73e0e166ef784eaf84a4862e7a64342b43f51·...·]-26">]</span><span·class="gp·unselectable">
247 (a@sam)9&gt;·</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7391169329-35">(</span><span·class="n">Item</span><span·class="p"·data-group-id="7391169329-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">table_[·...·truncated·by·diffoscope;·len:·207,·SHA:·6b81533a6bf5ac7bfc80dd1c7d78ba05cfa412e3065faaf3066e34ee06f5a9f3·...·]-36">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">247 (a@sam)9&gt;·</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7870106360-35">(</span><span·class="n">Item</span><span·class="p"·data-group-id="7870106360-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">table_[·...·truncated·by·diffoscope;·len:·207,·SHA:·495c7a919bee39b46f4a58dad6dae66c7cbc691a9a0715cc8720ae7928230fb4·...·]-36">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
248 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">248 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">
249 (a@sam)10&gt;·</span><span·class="n">Dist</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7391169329-37">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-38">[</span><span·class="ss">frag_d[·...·truncated·by·diffoscope;·len:·188,·SHA:·f5509758f27319a13007b00f78d43e13916b4af9e4704f49e80a4bf17fac235f·...·]-37">)</span><span·class="p">.</span><span·class="w">249 (a@sam)10&gt;·</span><span·class="n">Dist</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7870106360-37">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-38">[</span><span·class="ss">frag_d[·...·truncated·by·diffoscope;·len:·188,·SHA:·46906eccc7e216826ba10e520778212faceacb29e9260be2955e07d391ce8203·...·]-37">)</span><span·class="p">.</span><span·class="w">
250 </span><span·class="p"·data-group-id="7391169329-39">[</span><span·class="p"·data-group-id="7391169329-40">{</span><span·class="ss">c@sam</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="7391169329-40">}</span><span·class="p">,</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·413,·SHA:·a0c2639e8f8825bacea837b570b34a0ba9734552524c11fa38f3d5fc7ce0f966·...·]-39">]</span><span·class="gp·unselectable">250 </span><span·class="p"·data-group-id="7870106360-39">[</span><span·class="p"·data-group-id="7870106360-40">{</span><span·class="ss">c@sam</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="7870106360-40">}</span><span·class="p">,</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·413,·SHA:·0c637b67082c71a42085087f141e832ac2859c3b861d4a309c2ce135d3c82f10·...·]-39">]</span><span·class="gp·unselectable">
251 (a@sam)11&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_frag</span><span·class="p"·data-group-id="7391169329-43">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-44">{</span><span·class="ss">add_frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dist</span[·...·truncated·by·diffoscope;·len:·96,·SHA:·8d85ad14fd3e7795f47a20837a52e9e662895d6a57c2dad4f62f48cb8ed2b3dc·...·]-43">)</span><span·class="p">.</span><span·class="w">251 (a@sam)11&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_frag</span><span·class="p"·data-group-id="7870106360-43">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-44">{</span><span·class="ss">add_frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dist</span[·...·truncated·by·diffoscope;·len:·96,·SHA:·3e900903e16cfd9e279e2a5caf02c0680e8eb9d600b5e9a9c671989f1cdfeaa4·...·]-43">)</span><span·class="p">.</span><span·class="w">
252 </span><span·class="p"·data-group-id="7391169329-45">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7391169329-45">}</span><span·class="gp·unselectable">252 </span><span·class="p"·data-group-id="7870106360-45">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7870106360-45">}</span><span·class="gp·unselectable">
253 (a@sam)12&gt;·</span><span·class="n">Dist2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7391169329-46">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-47">[</span><span·class="ss">frag_d[·...·truncated·by·diffoscope;·len:·188,·SHA:·a3a05b172cd4c7a673badf6e923c05b6a5b8720df191b9a756999fbb24459d8e·...·]-46">)</span><span·class="p">.</span><span·class="w">253 (a@sam)12&gt;·</span><span·class="n">Dist2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7870106360-46">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-47">[</span><span·class="ss">frag_d[·...·truncated·by·diffoscope;·len:·188,·SHA:·7c26ae070236d5d95c60a241d112f483b7b3b9dfdded5de0640ad91609b6e9d3·...·]-46">)</span><span·class="p">.</span><span·class="w">
254 </span><span·class="p"·data-group-id="7391169329-48">[</span><span·class="p"·data-group-id="7391169329-49">{</span><span·class="ss">b@sam</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="7391169329-49">}</span><span·class="p">,</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·413,·SHA:·a2384e1dd9effb7ed102662d62286d2b18e7300922f7441ad22e70cbaa06b270·...·]-48">]</span><span·class="gp·unselectable">254 </span><span·class="p"·data-group-id="7870106360-48">[</span><span·class="p"·data-group-id="7870106360-49">{</span><span·class="ss">b@sam</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="7870106360-49">}</span><span·class="p">,</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·413,·SHA:·a25ea2f90b08e8ed6984b925f86a05557e30bd63f73a20b2d3e622fb4f98c868·...·]-48">]</span><span·class="gp·unselectable">
255 (a@sam)13&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_frag</span><span·class="p"·data-group-id="7391169329-52">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-53">{</span><span·class="ss">add_frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dist2</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·7a226f78e0d61b6a613cc6efa2296b4632a5b33654343f1b7acb1ee88476ddf7·...·]-52">)</span><span·class="p">.</span><span·class="w">255 (a@sam)13&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_frag</span><span·class="p"·data-group-id="7870106360-52">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-53">{</span><span·class="ss">add_frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dist2</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·ea3c49406c2c851d91c2d98299eeb8efaf9e7e76c3cd3a57b0789f82c2106058·...·]-52">)</span><span·class="p">.</span><span·class="w">
256 </span><span·class="p"·data-group-id="7391169329-54">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7391169329-54">}</span><span·class="gp·unselectable">256 </span><span·class="p"·data-group-id="7870106360-54">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7870106360-54">}</span><span·class="gp·unselectable">
257 (a@sam)14&gt;·</span><span·class="n">Dist3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7391169329-55">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-56">[</span><span·class="ss">frag_d[·...·truncated·by·diffoscope;·len:·188,·SHA:·710c394b4a55807ae85236edf2400afce6d84f373c781dcda0578f0caf6db081·...·]-55">)</span><span·class="p">.</span><span·class="w">257 (a@sam)14&gt;·</span><span·class="n">Dist3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7870106360-55">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-56">[</span><span·class="ss">frag_d[·...·truncated·by·diffoscope;·len:·188,·SHA:·05909e408e278a321b376a5ea9f3953776dad8c65cda9cd7c262ad0b8bb01467·...·]-55">)</span><span·class="p">.</span><span·class="w">
258 </span><span·class="p"·data-group-id="7391169329-57">[</span><span·class="p"·data-group-id="7391169329-58">{</span><span·class="ss">a@sam</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="7391169329-58">}</span><span·class="p">,</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·413,·SHA:·d7ce3c37aae5ff13847d83f8a74e17397d7ca55eb9859db67afa8336e692f9b5·...·]-57">]</span><span·class="gp·unselectable">258 </span><span·class="p"·data-group-id="7870106360-57">[</span><span·class="p"·data-group-id="7870106360-58">{</span><span·class="ss">a@sam</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="7870106360-58">}</span><span·class="p">,</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·413,·SHA:·ffece48d8fb5f72b55b2e4cd9b908a9c2dbed43280ea230285f4ec836255979a·...·]-57">]</span><span·class="gp·unselectable">
259 (a@sam)15&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_frag</span><span·class="p"·data-group-id="7391169329-61">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-62">{</span><span·class="ss">add_frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dist3</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·a7d1ff1a4122348f196408402c1176f5110cda3417bbcd73809082f547a8a953·...·]-61">)</span><span·class="p">.</span><span·class="w">259 (a@sam)15&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">change_table_frag</span><span·class="p"·data-group-id="7870106360-61">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-62">{</span><span·class="ss">add_frag</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dist3</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·1512abfed96fb632fdf26759f25795f87add8b116d5a7637c7452b624cb25207·...·]-61">)</span><span·class="p">.</span><span·class="w">
260 </span><span·class="p"·data-group-id="7391169329-63">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7391169329-63">}</span><span·class="gp·unselectable">260 </span><span·class="p"·data-group-id="7870106360-63">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="7870106360-63">}</span><span·class="gp·unselectable">
261 (a@sam)16&gt;·</span><span·class="n">Read</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7391169329-64">(</span><span·class="n">Key</span><span·class="p"·data-group-id="7391169329-64">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</s[·...·truncated·by·diffoscope;·len:·307,·SHA:·36c1744969d0056842e2babacdfc305fcfea11783f38288a73d9766f57548ae9·...·]-65">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">261 (a@sam)16&gt;·</span><span·class="n">Read</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7870106360-64">(</span><span·class="n">Key</span><span·class="p"·data-group-id="7870106360-64">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</s[·...·truncated·by·diffoscope;·len:·307,·SHA:·f513a6cffc79b5de0e9fda05e8a7bfda9f7d62e37b6dafc05ad23e738387cd1e·...·]-65">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
262 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">262 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">
263 (a@sam)17&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7391169329-67">(</span><span·class="ss">transaction</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Read</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-68">[</span><span·class="mi">12</s[·...·truncated·by·diffoscope;·len:·182,·SHA:·c7dfecaeeb2dd8a1fee4248dab5fa0f17621d7ea44ea25a3aca29f69cc810290·...·]-67">)</span><span·class="p">.</span><span·class="w">263 (a@sam)17&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7870106360-67">(</span><span·class="ss">transaction</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Read</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-68">[</span><span·class="mi">12</s[·...·truncated·by·diffoscope;·len:·182,·SHA:·cd75c460a7998b9bce6fca5ef1ed77d7ab2cc440f6b495ddcc1da62607323516·...·]-67">)</span><span·class="p">.</span><span·class="w">
264 </span><span·class="p"·data-group-id="7391169329-69">[</span><span·class="p"·data-group-id="7391169329-70">{</span><span·class="ss">dictionary</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="o">-</span><span·class="mi">12</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·73,·SHA:·c992c7c6d5e28b79c0d4101a98b1609d4762f8df3b3ff0a5816a29dcdcf953b7·...·]-69">]</span><span·class="gp·unselectable">264 </span><span·class="p"·data-group-id="7870106360-69">[</span><span·class="p"·data-group-id="7870106360-70">{</span><span·class="ss">dictionary</span><span·class="p">,</span><span·class="mi">12</span><span·class="p">,</span><span·class="o">-</span><span·class="mi">12</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·73,·SHA:·75a77ad15ed9035355c9378e57d6d14bf44d0ae5523b70aff731c4ab347b1a69·...·]-69">]</span><span·class="gp·unselectable">
265 (a@sam)18&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7391169329-71">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7391169329-72">[</span><span·class="ss">frag_s[·...·truncated·by·diffoscope;·len:·188,·SHA:·a80f0a16d31c9dd1b9b056d11fb1ff9f42d56637d375e1fe513bbd6048753f62·...·]-71">)</span><span·class="p">.</span><span·class="w">265 (a@sam)18&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="7870106360-71">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7870106360-72">[</span><span·class="ss">frag_s[·...·truncated·by·diffoscope;·len:·188,·SHA:·eb073ee6a0b42c1f27be878ac71847ae1c72861f2e2a348628e1d97a4ab3b865·...·]-71">)</span><span·class="p">.</span><span·class="w">
266 </span><span·class="p"·data-group-id="7391169329-73">[</span><span·class="p"·data-group-id="7391169329-74">{</span><span·class="ss">dictionary</span><span·class="p">,</span><span·class="mi">57</span><span·class="p"·data-group-id="7391169329-74">}</span><span·class="p">,</span><span·class="w">266 </span><span·class="p"·data-group-id="7870106360-73">[</span><span·class="p"·data-group-id="7870106360-74">{</span><span·class="ss">dictionary</span><span·class="p">,</span><span·class="mi">57</span><span·class="p"·data-group-id="7870106360-74">}</span><span·class="p">,</span><span·class="w">
267 ·</span><span·class="p"·data-group-id="7391169329-75">{</span><span·class="ss">dictionary_frag2</span><span·class="p">,</span><span·class="mi">63</span><span·class="p"·data-group-id="7391169329-75">}</span><span·class="p">,</span><span·class="w">267 ·</span><span·class="p"·data-group-id="7870106360-75">{</span><span·class="ss">dictionary_frag2</span><span·class="p">,</span><span·class="mi">63</span><span·class="p"·data-group-id="7870106360-75">}</span><span·class="p">,</span><span·class="w">
268 ·</span><span·class="p"·data-group-id="7391169329-76">{</span><span·class="ss">dictionary_frag3</span><span·class="p">,</span><span·class="mi">62</span><span·class="p"·data-group-id="7391169329-76">}</span><span·class="p">,</span><span·class="w">268 ·</span><span·class="p"·data-group-id="7870106360-76">{</span><span·class="ss">dictionary_frag3</span><span·class="p">,</span><span·class="mi">62</span><span·class="p"·data-group-id="7870106360-76">}</span><span·class="p">,</span><span·class="w">
269 ·</span><span·class="p"·data-group-id="7391169329-77">{</span><span·class="ss">dictionary_frag4</span><span·class="p">,</span><span·class="mi">74</span><span·class="p"·data-group-id="7391169329-77">}</span><span·class="p"·data-group-id="7391169329-73">]</span><span·class="w">269 ·</span><span·class="p"·data-group-id="7870106360-77">{</span><span·class="ss">dictionary_frag4</span><span·class="p">,</span><span·class="mi">74</span><span·class="p"·data-group-id="7870106360-77">}</span><span·class="p"·data-group-id="7870106360-73">]</span><span·class="w">
270 </span><span·class="p"·data-group-id="7391169329-78">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7391169329-78">)</span><span·class="mi">19</span><span·class="o">&gt;</span></code></pre><h3·id="fragmentation-properties"·class="section-heading">270 </span><span·class="p"·data-group-id="7870106360-78">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="7870106360-78">)</span><span·class="mi">19</span><span·class="o">&gt;</span></code></pre><h3·id="fragmentation-properties"·class="section-heading">
271 ··<a·href="#fragmentation-properties"·class="hover-link">271 ··<a·href="#fragmentation-properties"·class="hover-link">
272 ····<i·class="ri-link-m"·aria-hidden="true"></i>272 ····<i·class="ri-link-m"·aria-hidden="true"></i>
273 ··</a>273 ··</a>
274 ··<span·class="text">Fragmentation·Properties</span>274 ··<span·class="text">Fragmentation·Properties</span>
275 </h3>275 </h3>
276 <p>The·table·property·<code·class="inline">frag_properties</code>·can·be·read·with·the·function276 <p>The·table·property·<code·class="inline">frag_properties</code>·can·be·read·with·the·function
277 <a·href="mnesia.html#table_info/2"><code·class="inline">mnesia:table_info(Tab,·frag_properties)</code></a>.·The277 <a·href="mnesia.html#table_info/2"><code·class="inline">mnesia:table_info(Tab,·frag_properties)</code></a>.·The
Offset 305, 72 lines modifiedOffset 305, 72 lines modified
305 defaults·to·<code·class="inline">undefined</code>.·However,·if·the·foreign·key·is·set·to·something·else,305 defaults·to·<code·class="inline">undefined</code>.·However,·if·the·foreign·key·is·set·to·something·else,
306 it·causes·the·default·values·of·the·other·fragmentation·properties·to·be·the306 it·causes·the·default·values·of·the·other·fragmentation·properties·to·be·the
307 same·values·as·the·actual·fragmentation·properties·of·the·foreign·table.</p></li><li><p><strong><code·class="inline">{hash_module,·Atom}</code></strong>·-·Enables·definition·of·an·alternative·hashing307 same·values·as·the·actual·fragmentation·properties·of·the·foreign·table.</p></li><li><p><strong><code·class="inline">{hash_module,·Atom}</code></strong>·-·Enables·definition·of·an·alternative·hashing
308 scheme.·The·module·must·implement·the·<a·href="mnesia_frag_hash.html"><code·class="inline">mnesia_frag_hash</code></a>·callback·behavior.308 scheme.·The·module·must·implement·the·<a·href="mnesia_frag_hash.html"><code·class="inline">mnesia_frag_hash</code></a>·callback·behavior.
309 This·property·can·explicitly·be·set·at·table·creation.·Default·is309 This·property·can·explicitly·be·set·at·table·creation.·Default·is
310 <code·class="inline">mnesia_frag_hash</code>.</p></li><li><p><strong><code·class="inline">{hash_state,·Term}</code></strong>·-·Enables·a·table-specific·parameterization·of·a310 <code·class="inline">mnesia_frag_hash</code>.</p></li><li><p><strong><code·class="inline">{hash_state,·Term}</code></strong>·-·Enables·a·table-specific·parameterization·of·a
311 generic·hash·module.·This·property·can·explicitly·be·set·at·table·creation.311 generic·hash·module.·This·property·can·explicitly·be·set·at·table·creation.
312 Default·is·<code·class="inline">undefined</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="2138228566-1">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·51d0a0faaad571753374ff704c966ce05b47b50b13d6fc1c1355a1e7e2ce0a8f·...·]-1">)</span><span·class="gp·unselectable">312 Default·is·<code·class="inline">undefined</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="4091123007-1">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·b57010c90c55faf1a26f5833e232073a5a08009ae76785f2a7fd6677fc949a1a·...·]-1">)</span><span·class="gp·unselectable">
313 (a@sam)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2138228566-3">(</span><span·class="p"·data-group-id="2138228566-3">)</span><span·class="p">.</span><span·class="w">313 (a@sam)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4091123007-3">(</span><span·class="p"·data-group-id="4091123007-3">)</span><span·class="p">.</span><span·class="w">
314 </span><span·class="nf">ok</span><span·class="w">314 </span><span·class="nf">ok</span><span·class="w">
315 </span><span·class="p"·data-group-id="2138228566-4">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="2138228566-4">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">PrimProps</span><span·class="w">·</span><span·class="o">=</s[·...·truncated·by·diffoscope;·len:·811,·SHA:·898c24e78fb1e275829ecc72da37522de3511b42db8ead65d8f09b4670648489·...·]-5">]</span><span·class="p">.</span><span·class="w">315 </span><span·class="p"·data-group-id="4091123007-4">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="4091123007-4">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="n">PrimProps</span><span·class="w">·</span><span·class="o">=</s[·...·truncated·by·diffoscope;·len:·811,·SHA:·a653d39a59c12105c221421850e43d889407212410d61e98fe1872592509d7cb·...·]-5">]</span><span·class="p">.</span><span·class="w">
316 </span><span·class="p"·data-group-id="2138228566-10">[</span><span·class="p"·data-group-id="2138228566-11">{</span><span·class="ss">n_fragments</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="2138228566-11">}</span><span·class="p">,</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·326,·SHA:·7a7d479e8c9457b805e420bd9e4c824083bcbf2dcb3bcf814ae4874fcb894a3a·...·]-10">]</span><span·class="gp·unselectable">316 </span><span·class="p"·data-group-id="4091123007-10">[</span><span·class="p"·data-group-id="4091123007-11">{</span><span·class="ss">n_fragments</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="4091123007-11">}</span><span·class="p">,</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·326,·SHA:·330143682a142e2c17a40703398220e57b3a17b786e2db29adc38255c2eaed6a·...·]-10">]</span><span·class="gp·unselectable">
317 (a@sam)3&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2138228566-14">(</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="w">317 (a@sam)3&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="4091123007-14">(</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="w">
318 ······························</span><span·class="p"·data-group-id="2138228566-15">[</span><span·class="p"·data-group-id="2138228566-16">{</span><span·class="ss">frag_properties</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimProps</span><span·class="p"·data-group-id="2138228566-16">}</span><span·class="p">,</span><span·class="w">318 ······························</span><span·class="p"·data-group-id="4091123007-15">[</span><span·class="p"·data-group-id="4091123007-16">{</span><span·class="ss">frag_properties</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimProps</span><span·class="p"·data-group-id="4091123007-16">}</span><span·class="p">,</span><span·class="w">
319 ·······························</span><span·class="p"·data-group-id="2138228566-17">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2138228566-18">[</span><span·class="ss">prim_key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·218,·SHA:·1f83a2ac10c0cc09db80cbc31ffd2fee85a5bd1a50c8b0aece6654546c608197·...·]-14">)</span><span·class="p">.</span><span·class="w">319 ·······························</span><span·class="p"·data-group-id="4091123007-17">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4091123007-18">[</span><span·class="ss">prim_key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·218,·SHA:·2c9130f8cd512eb9d32e580e75458bd7b1812c4099da2ed2a70a1287e3c4a3ed·...·]-14">)</span><span·class="p">.</span><span·class="w">
320 </span><span·class="p"·data-group-id="2138228566-19">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="2138228566-19">}</span><span·class="gp·unselectable">320 </span><span·class="p"·data-group-id="4091123007-19">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="4091123007-19">}</span><span·class="gp·unselectable">
321 (a@sam)4&gt;·</span><span·class="n">SecProps</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2138228566-20">[</span><span·class="p"·data-group-id="2138228566-21">{</span><span·class="ss">foreign_key</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2138228566-22">{</span><span·class="ss">prim_dict</span><span·cla[·...·truncated·by·diffoscope;·len:·219,·SHA:·1b61288e13e288074fa630c1ccbbf530ac9679e09a8032a9c5bf5a177f812653·...·]-20">]</span><span·class="p">.</span><span·class="w">321 (a@sam)4&gt;·</span><span·class="n">SecProps</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4091123007-20">[</span><span·class="p"·data-group-id="4091123007-21">{</span><span·class="ss">foreign_key</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4091123007-22">{</span><span·class="ss">prim_dict</span><span·cla[·...·truncated·by·diffoscope;·len:·219,·SHA:·26b5d8bf7305ef05c5bdeafb15e25c2f1c42377a996cbb9ee583dfdee1fa3d83·...·]-20">]</span><span·class="p">.</span><span·class="w">
322 </span><span·class="p"·data-group-id="2138228566-23">[</span><span·class="p"·data-group-id="2138228566-24">{</span><span·class="ss">foreign_key</span><span·class="p">,</span><span·class="p"·data-group-id="2138228566-25">{</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·171,·SHA:·2c65e97e9cea9c418b9ea81628b5e191a8cf08366e181d22fa92312e966d873f·...·]-23">]</span><span·class="gp·unselectable">322 </span><span·class="p"·data-group-id="4091123007-23">[</span><span·class="p"·data-group-id="4091123007-24">{</span><span·class="ss">foreign_key</span><span·class="p">,</span><span·class="p"·data-group-id="4091123007-25">{</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·171,·SHA:·e9e2598853b2b1922a310b15ec605461b5600142649049e9d60dd64dafd662d6·...·]-23">]</span><span·class="gp·unselectable">
323 (a@sam)5&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="2138228566-26">(</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="w">323 (a@sam)5&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="4091123007-26">(</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="w">
324 ······························</span><span·class="p"·data-group-id="2138228566-27">[</span><span·class="p"·data-group-id="2138228566-28">{</span><span·class="ss">frag_properties</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecProps</span><span·class="p"·data-group-id="2138228566-28">}</span><span·class="p">,</span><span·class="w">324 ······························</span><span·class="p"·data-group-id="4091123007-27">[</span><span·class="p"·data-group-id="4091123007-28">{</span><span·class="ss">frag_properties</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecProps</span><span·class="p"·data-group-id="4091123007-28">}</span><span·class="p">,</span><span·class="w">
325 ·······························</span><span·class="p"·data-group-id="2138228566-29">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2138228566-30">[</span><span·class="ss">sec_key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·216,·SHA:·04f36d6cd7efafbf3a0eb24ce23889cd2626646288a07d04805929120c77fb1b·...·]-26">)</span><span·class="p">.</span><span·class="w">325 ·······························</span><span·class="p"·data-group-id="4091123007-29">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4091123007-30">[</span><span·class="ss">sec_key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·216,·SHA:·43ff37f40ecf7ce2d0a905b369fbb9fb8ef785e9e83a6352c86aa81b78048d3c·...·]-26">)</span><span·class="p">.</span><span·class="w">
326 </span><span·class="p"·data-group-id="2138228566-31">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="2138228566-31">}</span><span·class="gp·unselectable">326 </span><span·class="p"·data-group-id="4091123007-31">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="4091123007-31">}</span><span·class="gp·unselectable">
327 (a@sam)6&gt;·</span><span·class="n">Write</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="2138228566-32">(</span><span·class="n">Rec</span><span·class="p"·data-group-id="2138228566-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write<[·...·truncated·by·diffoscope;·len:·127,·SHA:·8e017abba30c1cc7289c2a71293451f500abb920f9ec6164de8cbd61da1363d6·...·]-33">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">327 (a@sam)6&gt;·</span><span·class="n">Write</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="4091123007-32">(</span><span·class="n">Rec</span><span·class="p"·data-group-id="4091123007-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">write<[·...·truncated·by·diffoscope;·len:·127,·SHA:·1caa21678cbeeb1ea236fbe09f81f435a76bd7b258efbec8a289c9f257b36e71·...·]-33">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
328 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">328 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">
329 (a@sam)7&gt;·</span><span·class="n">PrimKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">11</span><span·class="p">.</span><span·class="w">329 (a@sam)7&gt;·</span><span·class="n">PrimKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">11</span><span·class="p">.</span><span·class="w">
330 </span><span·class="mi">11</span><span·class="gp·unselectable">330 </span><span·class="mi">11</span><span·class="gp·unselectable">
331 (a@sam)8&gt;·</span><span·class="n">SecKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">.</span><span·class="w">331 (a@sam)8&gt;·</span><span·class="n">SecKey</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">.</span><span·class="w">
332 </span><span·class="mi">42</span><span·class="gp·unselectable">332 </span><span·class="mi">42</span><span·class="gp·unselectable">
333 (a@sam)9&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="2138228566-34">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">333 (a@sam)9&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="4091123007-34">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">
334 ··························</span><span·class="p"·data-group-id="2138228566-35">[</span><span·class="p"·data-group-id="2138228566-36">{</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimKey</span><span·class="p">,</span><span·class="w">·</span><span·class="o">-</s[·...·truncated·by·diffoscope;·len:·262,·SHA:·260ad8095cb305170ddd5b01a073f12f5df006c73db27b44e7484729a1a0037d·...·]-34">)</span><span·class="p">.</span><span·class="w">334 ··························</span><span·class="p"·data-group-id="4091123007-35">[</span><span·class="p"·data-group-id="4091123007-36">{</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimKey</span><span·class="p">,</span><span·class="w">·</span><span·class="o">-</s[·...·truncated·by·diffoscope;·len:·262,·SHA:·2022f65808cfb8c0a6f701f583686fb38b7be2d72038e43ebf1789ee4f8d786b·...·]-34">)</span><span·class="p">.</span><span·class="w">
335 </span><span·class="nf">ok</span><span·class="w">335 </span><span·class="nf">ok</span><span·class="w">
336 </span><span·class="p"·data-group-id="2138228566-37">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="2138228566-37">)</span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">ac[·...·truncated·by·diffoscope;·len:·54,·SHA:·dfa3b2855b83abc9e575f9bf6b71589c038d3f5384c44629e338158c2c30a05d·...·]-38">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">336 </span><span·class="p"·data-group-id="4091123007-37">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="4091123007-37">)</span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">ac[·...·truncated·by·diffoscope;·len:·54,·SHA:·58718c375dff39bdaf440fd96b41c5aa66a1cb59d61323bc661a6ac36adf3384·...·]-38">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Write</span><span·class="p">,</span><span·class="w">
337 ···························</span><span·class="p"·data-group-id="2138228566-39">[</span><span·class="p"·data-group-id="2138228566-40">{</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimKe[·...·truncated·by·diffoscope;·len:·240,·SHA:·627f7d92382f6a295cf76473f22999d639566f431dfd863d2e2fe2d2a0cb9f9e·...·]-38">)</span><span·class="p">.</span><span·class="w">337 ···························</span><span·class="p"·data-group-id="4091123007-39">[</span><span·class="p"·data-group-id="4091123007-40">{</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimKe[·...·truncated·by·diffoscope;·len:·240,·SHA:·c3d37d29689c880a07a549fb755ceb6cd59ab5abfc9e06506f22baf95c64e1b6·...·]-38">)</span><span·class="p">.</span><span·class="w">
338 </span><span·class="nf">ok</span><span·class="w">338 </span><span·class="nf">ok</span><span·class="w">
339 </span><span·class="p"·data-group-id="2138228566-41">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="2138228566-41">)</span><span·class="mi">11</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">ch[·...·truncated·by·diffoscope;·len:·630,·SHA:·d4edc11ce7925c4b64337782ad98e83ca1b1142c09c26b0cf1dab4e4c638b45f·...·]-42">)</span><span·class="p">.</span><span·class="w">339 </span><span·class="p"·data-group-id="4091123007-41">(</span><span·class="ss">a@sam</span><span·class="p"·data-group-id="4091123007-41">)</span><span·class="mi">11</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">ch[·...·truncated·by·diffoscope;·len:·630,·SHA:·71b7bcf1cb20218d73400874835e8ee485920ae98458a4b8a503c0d40215a880·...·]-42">)</span><span·class="p">.</span><span·class="w">
340 </span><span·class="p"·data-group-id="2138228566-46">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="2138228566-46">}</span><span·class="gp·unselectable">340 </span><span·class="p"·data-group-id="4091123007-46">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="4091123007-46">}</span><span·class="gp·unselectable">
341 (a@sam)12&gt;·</span><span·class="n">SecRead</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="2138228566-47">(</span><span·class="n">PrimKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecKey</span><span·class="p"·data-group-id="2138228566-47">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">341 (a@sam)12&gt;·</span><span·class="n">SecRead</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="4091123007-47">(</span><span·class="n">PrimKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecKey</span><span·class="p"·data-group-id="4091123007-47">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
342 ···············</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><span·class="p"·data-group-id="2138228566-48">(</span><span·class="p"·data-group-id="2138228566-49">{</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimKey</span><span·class="p"·data-group-id="2138228566-49">}</span><span·class="p"[·...·truncated·by·diffoscope;·len:·179,·SHA:·963dc04ad27e751a828a010893dd7b0c5f857c0db58ab7ed6f3c18a19e63c6f4·...·]-48">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">342 ···············</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">read</span><span·class="p"·data-group-id="4091123007-48">(</span><span·class="p"·data-group-id="4091123007-49">{</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrimKey</span><span·class="p"·data-group-id="4091123007-49">}</span><span·class="p"[·...·truncated·by·diffoscope;·len:·179,·SHA:·0f8b763261b335dd40653d4a6c32135c9e7425a04290c631e87378fa24363f0b·...·]-48">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
343 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">343 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">
344 (a@sam)13&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="2138228566-50">(</span><span·class="ss">transaction</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecRead</span><span·class="p">,</span><span·class="w">344 (a@sam)13&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="4091123007-50">(</span><span·class="ss">transaction</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecRead</span><span·class="p">,</span><span·class="w">
345 ···························</span><span·class="p"·data-group-id="2138228566-51">[</span><span·class="n">PrimKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecKey</span><span·class="p"·data-group-id="2138228566-51">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_[·...·truncated·by·diffoscope;·len:·52,·SHA:·e4ea21882b314099d82ecaa20418beb8e4740de6b6d44b5582314c0677df7b52·...·]-50">)</span><span·class="p">.</span><span·class="w">345 ···························</span><span·class="p"·data-group-id="4091123007-51">[</span><span·class="n">PrimKey</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecKey</span><span·class="p"·data-group-id="4091123007-51">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">mnesia_[·...·truncated·by·diffoscope;·len:·52,·SHA:·42c62a2b3e030affd5cd4358fb99d19500b7829a1c7ade6b899f5e221be58a26·...·]-50">)</span><span·class="p">.</span><span·class="w">
346 </span><span·class="p"·data-group-id="2138228566-52">[</span><span·class="p"·data-group-id="2138228566-53">{</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="mi">42</span><span·class="p">,</span><span·class="mi">11</span><span·class="p"·data-group-id="2138228566-53">}[·...·truncated·by·diffoscope;·len:·48,·SHA:·1bf03c561b76facce5a894191a3b45f5628a451b2a504f2799fa440b907b776d·...·]-52">]</span><span·class="gp·unselectable">346 </span><span·class="p"·data-group-id="4091123007-52">[</span><span·class="p"·data-group-id="4091123007-53">{</span><span·class="ss">sec_dict</span><span·class="p">,</span><span·class="mi">42</span><span·class="p">,</span><span·class="mi">11</span><span·class="p"·data-group-id="4091123007-53">}[·...·truncated·by·diffoscope;·len:·48,·SHA:·34def10b1c09cf9d660bb92481a7ed3002f40dfe2669b1c6d1f1e1037c8492c4·...·]-52">]</span><span·class="gp·unselectable">
347 (a@sam)14&gt;·</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="2138228566-54">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Item</span><span·class="p"·data-group-id="2138228566-54">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·282,·SHA:·389be4b189fd20f1048e3286f36627f648d39c71ccda1b8e1b8b9722536afa30·...·]-55">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">347 (a@sam)14&gt;·</span><span·class="n">Info</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="4091123007-54">(</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Item</span><span·class="p"·data-group-id="4091123007-54">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·282,·SHA:·f49a82d548ab5952b10c43c39cf32741fcb81f482fcd1e988650ef4c4ac32651·...·]-55">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
348 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">348 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="o">&lt;</span><span·class="ss">erl_eval</span><span·class="o">&gt;</span><span·class="gp·unselectable">
349 (a@sam)15&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="2138228566-56">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">349 (a@sam)15&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">activity</span><span·class="p"·data-group-id="4091123007-56">(</span><span·class="ss">sync_dirty</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">
350 ···························</span><span·class="p"·data-group-id="2138228566-57">[</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">frag_size</span><span·class="p"·data-group-id="2138228566-57">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·59,·SHA:·1de4129d3666b6e47686d061c3473082cb9d6451559784c414d2f5a030cf427a·...·]-56">)</span><span·class="p">.</span><span·class="w">350 ···························</span><span·class="p"·data-group-id="4091123007-57">[</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">frag_size</span><span·class="p"·data-group-id="4091123007-57">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·59,·SHA:·9fd0dfdc4ec1fa0475effc4ef3ad9bbbd2be0d887680dae448b30bfac9401bd3·...·]-56">)</span><span·class="p">.</span><span·class="w">
351 </span><span·class="p"·data-group-id="2138228566-58">[</span><span·class="p"·data-group-id="2138228566-59">{</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="2138228566-59">}</span><span·class="p">,</span><span·class="w">351 </span><span·class="p"·data-group-id="4091123007-58">[</span><span·class="p"·data-group-id="4091123007-59">{</span><span·class="ss">prim_dict</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="4091123007-59">}</span><span·class="p">,</span><span·class="w">
352 ·</span><span·class="p"·data-group-id="2138228566-60">{</span><span·class="ss">prim_dict_frag2</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="2138228566-60">}</span><span·class="p">,</span><span·class="w">352 ·</span><span·class="p"·data-group-id="4091123007-60">{</span><span·class="ss">prim_dict_frag2</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="4091123007-60">}</span><span·class="p">,</span><span·class="w">
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229 ··</a>229 ··</a>
230 ··<span·class="text">Startup·Files</span>230 ··<span·class="text">Startup·Files</span>
231 </h3>231 </h3>
232 <p><a·href="mnesia_chap3.html#start_mnesia">Start·Mnesia</a>·states·the·following·prerequisites232 <p><a·href="mnesia_chap3.html#start_mnesia">Start·Mnesia</a>·states·the·following·prerequisites
233 for·starting·<code·class="inline">Mnesia</code>:</p><ul><li>An·Erlang·session·must·be·started·and·a·<code·class="inline">Mnesia</code>·directory·must·be·specified233 for·starting·<code·class="inline">Mnesia</code>:</p><ul><li>An·Erlang·session·must·be·started·and·a·<code·class="inline">Mnesia</code>·directory·must·be·specified
234 for·the·database.</li><li>A·database·schema·must·be·initiated,·using·the·function234 for·the·database.</li><li>A·database·schema·must·be·initiated,·using·the·function
235 <a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema/1</code></a>.</li></ul><p>The·following·example·shows·how·these·tasks·are·performed:</p><p><em>Step·1:</em>·Start·an·Erlang·session·and·specify·a·<code·class="inline">Mnesia</code>·directory·for·the235 <a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema/1</code></a>.</li></ul><p>The·following·example·shows·how·these·tasks·are·performed:</p><p><em>Step·1:</em>·Start·an·Erlang·session·and·specify·a·<code·class="inline">Mnesia</code>·directory·for·the
236 database:</p><pre><code·class="text">%·erl·-sname·klacke·-mnesia·dir·'&quot;/ldisc/scratch/klacke&quot;'</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="4916223486-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.1</span><span·class="p">.</span><span·class="mi">2</span><span·class="p"·data-group-id="4916223486-1">]</span><span·class="w">236 database:</p><pre><code·class="text">%·erl·-sname·klacke·-mnesia·dir·'&quot;/ldisc/scratch/klacke&quot;'</code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="8667771401-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.1</span><span·class="p">.</span><span·class="mi">2</span><span·class="p"·data-group-id="8667771401-1">]</span><span·class="w">
  
237 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="4916223486-2">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·aa62cd3ea0d12fa4f9d0cbd2c71fe68a3689016b94fa57e33a4b1e29e7916e90·...·]-2">)</span><span·class="gp·unselectable">237 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mf">1.2</span><span·class="w">·</span><span·class="p"·data-group-id="8667771401-2">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·8767d8c67208fecf49b73edf0d02379954e6d545c85b5c69c31cfabeda6518b6·...·]-2">)</span><span·class="gp·unselectable">
238 (klacke@gin)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="4916223486-4">(</span><span·class="p"·data-group-id="4916223486-5">[</span><span·class="nf">node</span><span·class="p"·data-group-id="4916223486-6">(</span><span·class="p"·data-group-id="4916223486-6">)</span><span·class="p"·data-group-id="4916223486-5">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·a1ea719bd874df784ba7daf4da52a3b3aa054e5417dab5a95142303c523403d8·...·]-4">)</span><span·class="p">.</span><span·class="w">238 (klacke@gin)1&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_schema</span><span·class="p"·data-group-id="8667771401-4">(</span><span·class="p"·data-group-id="8667771401-5">[</span><span·class="nf">node</span><span·class="p"·data-group-id="8667771401-6">(</span><span·class="p"·data-group-id="8667771401-6">)</span><span·class="p"·data-group-id="8667771401-5">]<[·...·truncated·by·diffoscope;·len:·47,·SHA:·b538bce00ce85972fbe6a6a9edebe6c3611bf647ea9461673e2a454f1da9b777·...·]-4">)</span><span·class="p">.</span><span·class="w">
239 </span><span·class="nf">ok</span><span·class="w">239 </span><span·class="nf">ok</span><span·class="w">
240 </span><span·class="p"·data-group-id="4916223486-7">(</span><span·class="ss">klacke@gin</span><span·class="p"·data-group-id="4916223486-7">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">240 </span><span·class="p"·data-group-id="8667771401-7">(</span><span·class="ss">klacke@gin</span><span·class="p"·data-group-id="8667771401-7">)</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">
241 </span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">Z</span><span·class="w">241 </span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">Z</span><span·class="w">
242 </span><span·class="p"·data-group-id="4916223486-8">[</span><span·class="mi">1</span><span·class="p"·data-group-id="4916223486-8">]</span><span·class="o">+</span><span·class="w">··</span><span·class="n">Stopped</span><span·class="w">·················</span><span·class="ss">erl</span></code></pre><p><em>Step·2:</em>·You·can·inspect·the·<code·class="inline">Mnesia</code>·directory·to·see·what·files·have·been242 </span><span·class="p"·data-group-id="8667771401-8">[</span><span·class="mi">1</span><span·class="p"·data-group-id="8667771401-8">]</span><span·class="o">+</span><span·class="w">··</span><span·class="n">Stopped</span><span·class="w">·················</span><span·class="ss">erl</span></code></pre><p><em>Step·2:</em>·You·can·inspect·the·<code·class="inline">Mnesia</code>·directory·to·see·what·files·have·been
243 created:</p><pre><code·class="text">%·ls·-l·/ldisc/scratch/klacke243 created:</p><pre><code·class="text">%·ls·-l·/ldisc/scratch/klacke
244 -rw-rw-r--···1·klacke···staff·······247·Aug·12·15:06·FALLBACK.BUP</code></pre><p>The·response·shows·that·the·file·<code·class="inline">FALLBACK.BUP</code>·has·been·created.·This·is·called244 -rw-rw-r--···1·klacke···staff·······247·Aug·12·15:06·FALLBACK.BUP</code></pre><p>The·response·shows·that·the·file·<code·class="inline">FALLBACK.BUP</code>·has·been·created.·This·is·called
245 a·backup·file,·and·it·contains·an·initial·schema.·If·more·than·one·node·in·the245 a·backup·file,·and·it·contains·an·initial·schema.·If·more·than·one·node·in·the
246 function·<a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema/1</code></a>·had·been·specified,·identical·backup·files246 function·<a·href="mnesia.html#create_schema/1"><code·class="inline">mnesia:create_schema/1</code></a>·had·been·specified,·identical·backup·files
247 would·have·been·created·on·all·nodes.</p><p><em>Step·3:</em>·Start·<code·class="inline">Mnesia</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(klacke@gin)3&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6759072092-1">(</span><span·class="p"·data-group-id="6759072092-1">)</span><span·class="p">.</span><span·class="w">247 would·have·been·created·on·all·nodes.</p><p><em>Step·3:</em>·Start·<code·class="inline">Mnesia</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(klacke@gin)3&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="7616229449-1">(</span><span·class="p"·data-group-id="7616229449-1">)</span><span·class="p">.</span><span·class="w">
248 </span><span·class="ss">ok</span></code></pre><p><em>Step·4:</em>·You·can·see·the·following·listing·in·the·<code·class="inline">Mnesia</code>·directory:</p><pre><code·class="text">-rw-rw-r--···1·klacke···staff·········86·May·26·19:03·LATEST.LOG248 </span><span·class="ss">ok</span></code></pre><p><em>Step·4:</em>·You·can·see·the·following·listing·in·the·<code·class="inline">Mnesia</code>·directory:</p><pre><code·class="text">-rw-rw-r--···1·klacke···staff·········86·May·26·19:03·LATEST.LOG
249 -rw-rw-r--···1·klacke···staff······34507·May·26·19:03·schema.DAT</code></pre><p>The·schema·in·the·backup·file·<code·class="inline">FALLBACK.BUP</code>·has·been·used·to·generate·the·file249 -rw-rw-r--···1·klacke···staff······34507·May·26·19:03·schema.DAT</code></pre><p>The·schema·in·the·backup·file·<code·class="inline">FALLBACK.BUP</code>·has·been·used·to·generate·the·file
250 <code·class="inline">schema.DAT</code>.·Since·there·are·no·other·disc·resident·tables·than·the·schema,·no250 <code·class="inline">schema.DAT</code>.·Since·there·are·no·other·disc·resident·tables·than·the·schema,·no
251 other·data·files·were·created.·The·file·<code·class="inline">FALLBACK.BUP</code>·was·removed·after·the251 other·data·files·were·created.·The·file·<code·class="inline">FALLBACK.BUP</code>·was·removed·after·the
252 successful·&quot;restoration&quot;.·You·also·see·some·files·that·are·for·internal·use·by252 successful·&quot;restoration&quot;.·You·also·see·some·files·that·are·for·internal·use·by
253 <code·class="inline">Mnesia</code>.</p><p><em>Step·5:</em>·Create·a·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(klacke@gin)4&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1223821015-1">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="p"·data-group-id="1223821015-2">[</span><span·class="p"·data-group-id="1223821015-3">{</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1223821015-4">[</span><span·class="nf">node</span><span·class="p"·data-group-id="1223821015-5">(</span><span·class="p"·data-group-id="1223821015-5">)</span><span·class="p"·data-group-id="1223821015-4">]</span><span·class="p"·data-group-id="1223821015-3">}</span><span·class="p"·data-group-id="1223821015-2">]</span><span·class="p"·data-group-id="1223821015-1">)</span><span·class="p">.</span><span·class="w"> 
254 </span><span·class="p"·data-group-id="1223821015-6">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="1223821015-6">}</span></code></pre><p><em>Step·6:</em>·You·can·see·the·following·listi[·...·truncated·by·diffoscope;·len:·112,·SHA:·97a746fbad41ac6f5fe9013762a4d97380077fc7d0e49d5206c8569b7dda64af·...·]253 <code·class="inline">Mnesia</code>.</p><p><em>Step·5:</em>·Create·a·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(klacke@gin)4&gt;·</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">creat[·...·truncated·by·diffoscope;·len:·746,·SHA:·d5ee84533b74c76e8128d4cdefe48979f410d42b6c8f4d67aafb37d088364a6c·...·]
 254 </span><span·class="p"·data-group-id="0856179953-6">{</span><span·class="ss">atomic</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p"·data-group-id="0856179953-6">}</span></code></pre><p><em>Step·6:</em>·You·can·see·the·following·listing·in·the·<code·class="inline">Mnesia</code>·directory:</p><pre><code·class="text">%·ls·-l·/ldisc/scratch/klacke
255 -rw-rw-r--·1·klacke·staff····86·May·26·19:07·LATEST.LOG255 -rw-rw-r--·1·klacke·staff····86·May·26·19:07·LATEST.LOG
256 -rw-rw-r--·1·klacke·staff····94·May·26·19:07·foo.DCD256 -rw-rw-r--·1·klacke·staff····94·May·26·19:07·foo.DCD
257 -rw-rw-r--·1·klacke·staff··6679·May·26·19:07·schema.DAT</code></pre><p>The·file·<code·class="inline">foo.DCD</code>·has·been·created.·This·file·will·eventually·store·all·data257 -rw-rw-r--·1·klacke·staff··6679·May·26·19:07·schema.DAT</code></pre><p>The·file·<code·class="inline">foo.DCD</code>·has·been·created.·This·file·will·eventually·store·all·data
258 that·is·written·into·the·<code·class="inline">foo</code>·table.</p><h3·id="log-file"·class="section-heading">258 that·is·written·into·the·<code·class="inline">foo</code>·table.</p><h3·id="log-file"·class="section-heading">
259 ··<a·href="#log-file"·class="hover-link">259 ··<a·href="#log-file"·class="hover-link">
260 ····<i·class="ri-link-m"·aria-hidden="true"></i>260 ····<i·class="ri-link-m"·aria-hidden="true"></i>
261 ··</a>261 ··</a>
Offset 292, 19 lines modifiedOffset 292, 19 lines modified
292 and·it·is·efficient·to·insert·and·search·for·records·in·these·files·with·a292 and·it·is·efficient·to·insert·and·search·for·records·in·these·files·with·a
293 specific·key.·The·<code·class="inline">.DAT</code>·files·are·used·for·the·schema·and·for293 specific·key.·The·<code·class="inline">.DAT</code>·files·are·used·for·the·schema·and·for
294 <code·class="inline">disc_only_copies</code>·tables.·The·<code·class="inline">Mnesia</code>·data·files·are·currently·implemented·in294 <code·class="inline">disc_only_copies</code>·tables.·The·<code·class="inline">Mnesia</code>·data·files·are·currently·implemented·in
295 the·standard·library·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/dets.html"><code·class="inline">dets</code></a>·in·<code·class="inline">STDLIB</code>.</p><p>All·operations·that·can·be·performed·on·<code·class="inline">dets</code>·files·can·also·be·performed·on295 the·standard·library·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/dets.html"><code·class="inline">dets</code></a>·in·<code·class="inline">STDLIB</code>.</p><p>All·operations·that·can·be·performed·on·<code·class="inline">dets</code>·files·can·also·be·performed·on
296 the·<code·class="inline">Mnesia</code>·data·files.·For·example,·<code·class="inline">dets</code>·contains·the·function296 the·<code·class="inline">Mnesia</code>·data·files.·For·example,·<code·class="inline">dets</code>·contains·the·function
297 <a·href="../../../../lib/stdlib-6.2.2/doc/html/dets.html#traverse/2"><code·class="inline">dets:traverse/2</code></a>,·which·can·be·used·to·view·the·contents·of·a·<code·class="inline">Mnesia</code>·<code·class="inline">DAT</code>297 <a·href="../../../../lib/stdlib-6.2.2/doc/html/dets.html#traverse/2"><code·class="inline">dets:traverse/2</code></a>,·which·can·be·used·to·view·the·contents·of·a·<code·class="inline">Mnesia</code>·<code·class="inline">DAT</code>
298 file.·However,·this·can·only·be·done·when·<code·class="inline">Mnesia</code>·is·not·running.·So,·to·view298 file.·However,·this·can·only·be·done·when·<code·class="inline">Mnesia</code>·is·not·running.·So,·to·view
299 the·schema·file,·do·as·follows;</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5069859707-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="5069859707-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·688,·SHA:·91ee1513060b9ef9f21c6943721ba3fd4a18a21ea527a5bba9a543f3f98877bf·...·]-5">}</span><span·class="p">,</span><span·class="w">299 the·schema·file,·do·as·follows;</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8232043236-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="8232043236-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·688,·SHA:·2e0ed60ea7a12ac61e9035b1e29c735cfdc063e235a64ec79dd6c8abf33e3c80·...·]-5">}</span><span·class="p">,</span><span·class="w">
300 </span><span·class="p"·data-group-id="5069859707-6">{</span><span·class="ss">keypos</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="5069859707-6">}</span><span·class="p"·data-group-id="5069859707-3">]</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·0063f148cbc9ceabffa50f3cbf30130b40b153f87f4f92ee93972361a5090378·...·]-2">)</span><span·class="p">,</span><span·class="w">300 </span><span·class="p"·data-group-id="8232043236-6">{</span><span·class="ss">keypos</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="8232043236-6">}</span><span·class="p"·data-group-id="8232043236-3">]</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·e28210f7386b53f6547e241cc425d56df7f2b03be02279daa79ba504a667bc4f·...·]-2">)</span><span·class="p">,</span><span·class="w">
301 </span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="5069859707-7">(</span><span·class="n">X</span><span·class="p"·data-group-id="5069859707-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><[·...·truncated·by·diffoscope;·len:·381,·SHA:·9f89811df64d28d19313b71aa8e4deefedeacf633cd0f0a1d6fdf03b4f01b375·...·]-8">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">301 </span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8232043236-7">(</span><span·class="n">X</span><span·class="p"·data-group-id="8232043236-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><[·...·truncated·by·diffoscope;·len:·381,·SHA:·998a850dc24c515b7752707f9ca49347e7ccc6fba7951900a33adacd326818d9·...·]-8">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
302 </span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">traverse</span><span·class="p"·data-group-id="5069859707-10">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="5069859707-10">)</span><span·class="p">,</span><span·class="w">302 </span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">traverse</span><span·class="p"·data-group-id="8232043236-10">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="8232043236-10">)</span><span·class="p">,</span><span·class="w">
303 </span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5069859707-11">(</span><span·class="n">N</span><span·class="p"·data-group-id="5069859707-11">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>The·<code·class="inline">DAT</code>·files·must·always·be·opened·with·option·<code·class="inline">{repair,·false}</code>.·This303 </span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="8232043236-11">(</span><span·class="n">N</span><span·class="p"·data-group-id="8232043236-11">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>The·<code·class="inline">DAT</code>·files·must·always·be·opened·with·option·<code·class="inline">{repair,·false}</code>.·This
304 ensures·that·these·files·are·not·automatically·repaired.·Without·this·option,304 ensures·that·these·files·are·not·automatically·repaired.·Without·this·option,
305 the·database·can·become·inconsistent,·because·<code·class="inline">Mnesia</code>·can·believe·that·the305 the·database·can·become·inconsistent,·because·<code·class="inline">Mnesia</code>·can·believe·that·the
306 files·were·properly·closed.·For·information·about·configuration·parameter306 files·were·properly·closed.·For·information·about·configuration·parameter
307 <code·class="inline">auto_repair</code>,·see·the·Reference·Manual.</p></section><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>It·is·recommended·that·the·data·files·are·not·tampered·with·while·<code·class="inline">Mnesia</code>·is307 <code·class="inline">auto_repair</code>,·see·the·Reference·Manual.</p></section><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>It·is·recommended·that·the·data·files·are·not·tampered·with·while·<code·class="inline">Mnesia</code>·is
308 running.·While·not·prohibited,·the·behavior·of·<code·class="inline">Mnesia</code>·is·unpredictable.</p></section><p>The·<code·class="inline">disc_copies</code>·tables·are·stored·on·disk·with·<code·class="inline">.DCL</code>·and·<code·class="inline">.DCD</code>·files,·which308 running.·While·not·prohibited,·the·behavior·of·<code·class="inline">Mnesia</code>·is·unpredictable.</p></section><p>The·<code·class="inline">disc_copies</code>·tables·are·stored·on·disk·with·<code·class="inline">.DCL</code>·and·<code·class="inline">.DCD</code>·files,·which
309 are·standard·<code·class="inline">disk_log</code>·files.</p><h2·id="loading-tables-at-startup"·class="section-heading">309 are·standard·<code·class="inline">disk_log</code>·files.</p><h2·id="loading-tables-at-startup"·class="section-heading">
310 ··<a·href="#loading-tables-at-startup"·class="hover-link">310 ··<a·href="#loading-tables-at-startup"·class="hover-link">
Offset 530, 46 lines modifiedOffset 530, 46 lines modified
530 of·what·<code·class="inline">record_name</code>·is·set·to.</li></ul><p>The·backup·data·is·divided·into·two·sections.·The·first·section·contains530 of·what·<code·class="inline">record_name</code>·is·set·to.</li></ul><p>The·backup·data·is·divided·into·two·sections.·The·first·section·contains
531 information·related·to·the·schema.·All·schema-related·items·are·tuples·where·the531 information·related·to·the·schema.·All·schema-related·items·are·tuples·where·the
532 first·field·equals·the·atom·schema.·The·second·section·is·the·record·section.532 first·field·equals·the·atom·schema.·The·second·section·is·the·record·section.
533 Schema·records·cannot·be·mixed·with·other·records·and·all·schema·records·must·be533 Schema·records·cannot·be·mixed·with·other·records·and·all·schema·records·must·be
534 located·first·in·the·backup.</p><p>The·schema·itself·is·a·table·and·is·possibly·included·in·the·backup.·Each·node534 located·first·in·the·backup.</p><p>The·schema·itself·is·a·table·and·is·possibly·included·in·the·backup.·Each·node
535 where·the·schema·table·resides·is·regarded·as·a·<code·class="inline">db_node</code>.</p><p>The·following·example·shows·how535 where·the·schema·table·resides·is·regarded·as·a·<code·class="inline">db_node</code>.</p><p>The·following·example·shows·how
536 <a·href="mnesia.html#traverse_backup/4"><code·class="inline">mnesia:traverse_backup</code></a>·can·be·used·to·rename·a536 <a·href="mnesia.html#traverse_backup/4"><code·class="inline">mnesia:traverse_backup</code></a>·can·be·used·to·rename·a
537 <code·class="inline">db_node</code>·in·a·backup·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">change_node_name</span><span·class="p"·data-group-id="1047796902-1">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">To</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·135,·SHA:·7587f8978772707092c75c6dfb0c020a1df13b39a2484d23dc01b561616cc2f8·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">537 <code·class="inline">db_node</code>·in·a·backup·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">change_node_name</span><span·class="p"·data-group-id="8839743101-1">(</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">To</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·135,·SHA:·d650d40cb195b21184a19cb50e007d9b29f024f8e2e1a37a5efb04b0704bb29f·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
538 ····</span><span·class="n">Switch</span><span·class="w">·</span><span·class="o">=</span><span·class="w">538 ····</span><span·class="n">Switch</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
539 ········</span><span·class="nf">fun</span><span·class="p"·data-group-id="1047796902-2">(</span><span·class="n">Node</span><span·class="p"·data-group-id="1047796902-2">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">From</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">To</span><span·class="p">;</span><span·class="w">539 ········</span><span·class="nf">fun</span><span·class="p"·data-group-id="8839743101-2">(</span><span·class="n">Node</span><span·class="p"·data-group-id="8839743101-2">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="n">From</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">To</span><span·class="p">;</span><span·class="w">
540 ···········</span><span·class="p"·data-group-id="1047796902-3">(</span><span·class="n">Node</span><span·class="p"·data-group-id="1047796902-3">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">==</span><sp[·...·truncated·by·diffoscope;·len:·466,·SHA:·db1b5462f98512bd0a8053ad15877b68c59b1ff3f6cc7408ecddd26298470a07·...·]-4">)</span><span·class="p">;</span><span·class="w">540 ···········</span><span·class="p"·data-group-id="8839743101-3">(</span><span·class="n">Node</span><span·class="p"·data-group-id="8839743101-3">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">==</span><sp[·...·truncated·by·diffoscope;·len:·466,·SHA:·e73c09dc22638c1e8f60c4dfd1ff1dd70386eb69c09bb267e44871602e783421·...·]-4">)</span><span·class="p">;</span><span·class="w">
541 ···········</span><span·class="p"·data-group-id="1047796902-6">(</span><span·class="n">Node</span><span·class="p"·data-group-id="1047796902-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">541 ···········</span><span·class="p"·data-group-id="8839743101-6">(</span><span·class="n">Node</span><span·class="p"·data-group-id="8839743101-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">
542 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">542 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
543 ····</span><span·class="n">Convert</span><span·class="w">·</span><span·class="o">=</span><span·class="w">543 ····</span><span·class="n">Convert</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
544 ········</span><span·class="nf">fun</span><span·class="p"·data-group-id="1047796902-7">(</span><span·class="p"·data-group-id="1047796902-8">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version<[·...·truncated·by·diffoscope;·len:·174,·SHA:·cfd3c9ddbcb81db65b14a290153901d3ecaf2c7ad3765e2570f228e9519e2e81·...·]-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">544 ········</span><span·class="nf">fun</span><span·class="p"·data-group-id="8839743101-7">(</span><span·class="p"·data-group-id="8839743101-8">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Version<[·...·truncated·by·diffoscope;·len:·174,·SHA:·982cd9a01c953c9e28bd5134eb9d4a76fb0d1f513f940119370423e8b109800a·...·]-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
545 ················</span><span·class="p"·data-group-id="1047796902-9">{</span><span·class="p"·data-group-id="1047796902-10">[</span><span·class="p"·data-group-id="1047796902-11">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·284,·SHA:·f41af445abfe1973533aa2907deac06d108d1ba3fa6b9ecf776df862386be48c·...·]-9">}</span><span·class="p">;</span><span·class="w">545 ················</span><span·class="p"·data-group-id="8839743101-9">{</span><span·class="p"·data-group-id="8839743101-10">[</span><span·class="p"·data-group-id="8839743101-11">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">version</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·284,·SHA:·a0e5a366ec72f1d5f17a843965384470b096112afdb8aa4b9664df687863eb46·...·]-9">}</span><span·class="p">;</span><span·class="w">
546 ···········</span><span·class="p"·data-group-id="1047796902-12">(</span><span·class="p"·data-group-id="1047796902-13">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cookie</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cookie<[·...·truncated·by·diffoscope;·len:·175,·SHA:·d66126ddc95799f77d99e35b6b23223675c519031f08bec7fd93e9b58cab569b·...·]-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">546 ···········</span><span·class="p"·data-group-id="8839743101-12">(</span><span·class="p"·data-group-id="8839743101-13">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cookie</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cookie<[·...·truncated·by·diffoscope;·len:·175,·SHA:·28644e42bb611786e1c8df32f0c08366b005adde625413f6eb2b92c5ffcf75b2·...·]-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
547 ················</span><span·class="p"·data-group-id="1047796902-14">{</span><span·class="p"·data-group-id="1047796902-15">[</span><span·class="p"·data-group-id="1047796902-16">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cookie</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·283,·SHA:·34efba28cc648ab23248ec41efb52b6c7b22e06e3b93735ab9b4fe4ee79a512f·...·]-14">}</span><span·class="p">;</span><span·class="w">547 ················</span><span·class="p"·data-group-id="8839743101-14">{</span><span·class="p"·data-group-id="8839743101-15">[</span><span·class="p"·data-group-id="8839743101-16">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cookie</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·283,·SHA:·724c2c880899fe396c8e021e0126bce3ef0186306e376405a1c9268ab8cb00d4·...·]-14">}</span><span·class="p">;</span><span·class="w">
548 ···········</span><span·class="p"·data-group-id="1047796902-17">(</span><span·class="p"·data-group-id="1047796902-18">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CreateList<[·...·truncated·by·diffoscope;·len:·175,·SHA:·668553446785ac7d12a1c5d5a0df9722b8e0323d1211a5f3fe3eeec3d0dd0db0·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">548 ···········</span><span·class="p"·data-group-id="8839743101-17">(</span><span·class="p"·data-group-id="8839743101-18">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CreateList<[·...·truncated·by·diffoscope;·len:·175,·SHA:·997a7ca9f061551f2358f8b83ca0329b443b4a6b10d77cdaa07234241e3f0922·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
549 ················</span><span·class="n">Keys</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1047796902-19">[</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disc_only_copies</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·3d5dfe771ab27fc66d276eada559490cfd5e3bf985458e2fd0802071c66c2f7c·...·]-19">]</span><span·class="p">,</span><span·class="w">549 ················</span><span·class="n">Keys</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8839743101-19">[</span><span·class="ss">ram_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disc_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disc_only_copies</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·13,·SHA:·e5a609fa2a8bbfc391e0dd0bf052cc3af5fb850c01c16184c2432823ba5ce3c9·...·]-19">]</span><span·class="p">,</span><span·class="w">
550 ················</span><span·class="n">OptSwitch</span><span·class="w">·</span><span·class="o">=</span><span·class="w">550 ················</span><span·class="n">OptSwitch</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
551 ····················</span><span·class="nf">fun</span><span·class="p"·data-group-id="1047796902-20">(</span><span·class="p"·data-group-id="1047796902-21">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="1047796902-21">}</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·4fe87bc741013ad8a52429fcb6e9a529b2e271ec044b3329d91cfda213e1bc95·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">551 ····················</span><span·class="nf">fun</span><span·class="p"·data-group-id="8839743101-20">(</span><span·class="p"·data-group-id="8839743101-21">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="8839743101-21">}</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·745c579a553c919c3bd715ba525e41b0324454d482788d57c1a2f511e7be1526·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
552 ····························</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="1047796902-22">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Keys</span><span·class="p"·data-group-id="1047796902-22">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">552 ····························</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="8839743101-22">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Keys</span><span·class="p"·data-group-id="8839743101-22">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
553 ································</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1047796902-23">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="1047796902-24">(</span><span·class="n">Switch</s[·...·truncated·by·diffoscope;·len:·173,·SHA:·477d77bb6dfe0a9463b3772e300ec120a5f65fe3fb2e61e93d68095610877767·...·]-23">}</span><span·class="p">;</span><span·class="w">553 ································</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8839743101-23">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="8839743101-24">(</span><span·class="n">Switch</s[·...·truncated·by·diffoscope;·len:·173,·SHA:·2b61c80246c4660a43687d64fe18e8a510be748b45a315184b95a1298c56914e·...·]-23">}</span><span·class="p">;</span><span·class="w">
554 ································</span><span·class="ss">false</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1047796902-25">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="1047796902-25">}</span><span·class="w">554 ································</span><span·class="ss">false</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8839743101-25">{</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p"·data-group-id="8839743101-25">}</span><span·class="w">
555 ····························</span><span·class="k">end</span><span·class="w">555 ····························</span><span·class="k">end</span><span·class="w">
556 ····················</span><span·class="k">end</span><span·class="p">,</span><span·class="w">556 ····················</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
557 ················</span><span·class="p"·data-group-id="1047796902-26">{</span><span·class="p"·data-group-id="1047796902-27">[</span><span·class="p"·data-group-id="1047796902-28">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·551,·SHA:·9e3eefb8afa1ecdda6a1273c899006184d4d26953aa5f8b5f922e8964908937a·...·]-26">}</span><span·class="p">;</span><span·class="w">557 ················</span><span·class="p"·data-group-id="8839743101-26">{</span><span·class="p"·data-group-id="8839743101-27">[</span><span·class="p"·data-group-id="8839743101-28">{</span><span·class="ss">schema</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tab</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·551,·SHA:·d05d3e6d424e5f5c64c692146610ab91a822de92e2a0ec6c6bae118a13b09dcd·...·]-26">}</span><span·class="p">;</span><span·class="w">
558 ···········</span><span·class="p"·data-group-id="1047796902-30">(</span><span·class="n">Other</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="1047796902-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">558 ···········</span><span·class="p"·data-group-id="8839743101-30">(</span><span·class="n">Other</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="8839743101-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
559 ················</span><span·class="p"·data-group-id="1047796902-31">{</span><span·class="p"·data-group-id="1047796902-32">[</span><span·class="n">Other</span><span·class="p"·data-group-id="1047796902-32">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·36dd82ca7cff10217046f2c30020ad35468a1d358c4fc6b28da7d9e5c0521442·...·]-31">}</span><span·class="w">559 ················</span><span·class="p"·data-group-id="8839743101-31">{</span><span·class="p"·data-group-id="8839743101-32">[</span><span·class="n">Other</span><span·class="p"·data-group-id="8839743101-32">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·26b36519dfbfe384a00664b605b13a29b6ace58ccf84f5ea0226bba496788e08·...·]-31">}</span><span·class="w">
560 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">560 ········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
561 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">traverse_backup</span><span·class="p"·data-group-id="1047796902-33">(</span><span·class="n">Source</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Target</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·220,·SHA:·cf2edd99ffc072408df7eeb6b8f6c26b914898ab2f2efa56f4e309953ee3ed80·...·]-33">)</span><span·class="p">.</span><span·class="w">561 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">traverse_backup</span><span·class="p"·data-group-id="8839743101-33">(</span><span·class="n">Source</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Target</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·220,·SHA:·256442b19e083fad4e25a6c89dc5d9c4d2c2116507cd1ba82d884baa4cefe2c7·...·]-33">)</span><span·class="p">.</span><span·class="w">
  
562 </span><span·class="nf">view</span><span·class="p"·data-group-id="1047796902-34">(</span><span·class="n">Source</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="1047796902-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">562 </span><span·class="nf">view</span><span·class="p"·data-group-id="8839743101-34">(</span><span·class="n">Source</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="8839743101-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
563 ····</span><span·class="n">View</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1047796902-35">(</span><span·class="n">Item</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="1047796902-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">563 ····</span><span·class="n">View</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8839743101-35">(</span><span·class="n">Item</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="8839743101-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
564 ···················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1047796902-36">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">.</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1047796902-37">[</span><span·class="n">Item<[·...·truncated·by·diffoscope;·len:·101,·SHA:·dffabc86a927b9bda29c460620b0f38668385a291379b4bc1bf6be283aef6441·...·]-36">)</span><span·class="p">,</span><span·class="w">564 ···················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8839743101-36">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">.</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8839743101-37">[</span><span·class="n">Item<[·...·truncated·by·diffoscope;·len:·101,·SHA:·f2595bf4c85b11f5b8945d3062db11f79bccb3e778d9a69bd36800c296835bf3·...·]-36">)</span><span·class="p">,</span><span·class="w">
565 ···················</span><span·class="p"·data-group-id="1047796902-38">{</span><span·class="p"·data-group-id="1047796902-39">[</span><span·class="n">Item</span><span·class="p"·data-group-id="1047796902-39">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·114,·SHA:·0d2e5d8a7748039491dc7f581d06b75a1449debd7d632619abd695a4e4226a92·...·]-38">}</span><span·class="w">565 ···················</span><span·class="p"·data-group-id="8839743101-38">{</span><span·class="p"·data-group-id="8839743101-39">[</span><span·class="n">Item</span><span·class="p"·data-group-id="8839743101-39">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·114,·SHA:·9135e8cb18e5b6e9abb6899fdce8d4cfccf30150c45380fb91e827a5d8b7f3fc·...·]-38">}</span><span·class="w">
566 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">566 ···········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
567 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">traverse_backup</span><span·class="p"·data-group-id="1047796902-40">(</span><span·class="n">Source</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">dummy</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·217,·SHA:·1a0357c8e78616ca09ff6c322a6d74cb524395281067cbb15d118e4991862e74·...·]-40">)</span><span·class="p">.</span></code></pre><h3·id="restore"·class="section-heading">567 ····</span><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">traverse_backup</span><span·class="p"·data-group-id="8839743101-40">(</span><span·class="n">Source</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">dummy</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·217,·SHA:·c522084f161171e80d9fe560875cbde7fca5e92c3c71ad50d76bf7e086da3b81·...·]-40">)</span><span·class="p">.</span></code></pre><h3·id="restore"·class="section-heading">
568 ··<a·href="#restore"·class="hover-link">568 ··<a·href="#restore"·class="hover-link">
569 ····<i·class="ri-link-m"·aria-hidden="true"></i>569 ····<i·class="ri-link-m"·aria-hidden="true"></i>
570 ··</a>570 ··</a>
571 ··<span·class="text">Restore</span>571 ··<span·class="text">Restore</span>
572 </h3>572 </h3>
573 <p>Tables·can·be·restored·online·from·a·backup·without·restarting·<code·class="inline">Mnesia</code>.·A573 <p>Tables·can·be·restored·online·from·a·backup·without·restarting·<code·class="inline">Mnesia</code>.·A
574 restore·is·performed·with·the·function574 restore·is·performed·with·the·function
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709 ······</p>709 ······</p>
710 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>710 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
711 ····</footer>711 ····</footer>
712 ··</div>712 ··</div>
713 </main>713 </main>
714 </div>714 </div>
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191 ······</p>191 ······</p>
192 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>192 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
193 ····</footer>193 ····</footer>
194 ··</div>194 ··</div>
195 </main>195 </main>
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411 ····</footer>411 ····</footer>
412 ··</div>412 ··</div>
413 </main>413 </main>
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243 ······</p>243 ······</p>
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245 ····</footer>245 ····</footer>
246 ··</div>246 ··</div>
247 </main>247 </main>
248 </div>248 </div>
249 <script>249 <script>
250 ··function·mermaidLoaded()·{250 ··function·mermaidLoaded()·{
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250 ··········<pre·translate="no"><span·class="attribute">-spec</span>·create_table(Tab·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),·Opt·::·[{<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()}])·->·ok.</pre>250 ··········<pre·translate="no"><span·class="attribute">-spec</span>·create_table(Tab·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),·Opt·::·[{<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()}])·->·ok.</pre>
  
251 ······</div>251 ······</div>
  
252 <section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p><em>This·function·is·deprecated.·Do·not·use·it.</em></p></section><p>A·wrapper·function·for·<a·href="mnesia.html#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>,·which·creates·a·table·(if·there252 <section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p><em>This·function·is·deprecated.·Do·not·use·it.</em></p></section><p>A·wrapper·function·for·<a·href="mnesia.html#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>,·which·creates·a·table·(if·there
253 is·no·existing·table)·with·an·appropriate·set·of·<code·class="inline">attributes</code>.·The·attributes253 is·no·existing·table)·with·an·appropriate·set·of·<code·class="inline">attributes</code>.·The·attributes
254 and·<code·class="inline">TabDef</code>·are·forwarded·to·<a·href="mnesia.html#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>.·For·example,·if·the·table254 and·<code·class="inline">TabDef</code>·are·forwarded·to·<a·href="mnesia.html#create_table/2"><code·class="inline">mnesia:create_table/2</code></a>.·For·example,·if·the·table
255 is·to·reside·as·<code·class="inline">disc_only_copies</code>·on·all·nodes,·a·call·looks·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">TabDef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3212839564-1">[</span><span·class="p"·data-group-id="3212839564-2">{</span><span·class="p"·data-group-id="3212839564-3">{</span><span·class="ss">disc_only_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">node</span><span·class=[·...·truncated·by·diffoscope;·len:·318,·SHA:·12fe34a83dfffbf4d2e4cd76880f11c6b67c3cf5d58fae15fab672e9a8f9600c·...·]-3">}</span><span·class="p">]</span><span·class="p">,</span><span·class="w">255 is·to·reside·as·<code·class="inline">disc_only_copies</code>·on·all·nodes,·a·call·looks·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">TabDef</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1018700449-1">[</span><span·class="p"·data-group-id="1018700449-2">{</span><span·class="p"·data-group-id="1018700449-3">{</span><span·class="ss">disc_only_copies</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">node</span><span·class=[·...·truncated·by·diffoscope;·len:·318,·SHA:·1bec31ab6f1086d589b0689b467f3f45f387c12bd1ae0d8746c7aedcc30f9b6b·...·]-3">}</span><span·class="p">]</span><span·class="p">,</span><span·class="w">
256 ··········</span><span·class="nc">mnesia_registry</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3212839564-6">(</span><span·class="ss">my_reg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabDef</span><span·class="p"·data-group-id="3212839564-6">)</span></code></pre>256 ··········</span><span·class="nc">mnesia_registry</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="1018700449-6">(</span><span·class="ss">my_reg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TabDef</span><span·class="p"·data-group-id="1018700449-6">)</span></code></pre>
257 ··</section>257 ··</section>
258 </section>258 </section>
  
259 ····</div>259 ····</div>
260 ··</section>260 ··</section>
  
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284 ······</p>284 ······</p>
285 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>285 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
286 ····</footer>286 ····</footer>
287 ··</div>287 ··</div>
288 </main>288 </main>
289 </div>289 </div>
290 <script>290 <script>
291 ··function·mermaidLoaded()·{291 ··function·mermaidLoaded()·{
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1543 </main>1543 </main>
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148 ··</div>148 ··</div>
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149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
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215 ····</footer>215 ····</footer>
216 ··</div>216 ··</div>
217 </main>217 </main>
218 </div>218 </div>
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184 ····</footer>184 ····</footer>
185 ··</div>185 ··</div>
186 </main>186 </main>
187 </div>187 </div>
188 <script>188 <script>
189 ··function·mermaidLoaded()·{189 ··function·mermaidLoaded()·{
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375 </main>375 </main>
376 </div>376 </div>
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1848 returns·a·match·specification,·which·turns·on·sequential·tracing·with·the1848 returns·a·match·specification,·which·turns·on·sequential·tracing·with·the
1849 specified·<code·class="inline">Flags</code>.</p><p>This·match·specification·can·be·specified·as·the·last·argument·to·<code·class="inline">tp</code>·or·<code·class="inline">tpl</code>.1849 specified·<code·class="inline">Flags</code>.</p><p>This·match·specification·can·be·specified·as·the·last·argument·to·<code·class="inline">tp</code>·or·<code·class="inline">tpl</code>.
1850 The·activated·<code·class="inline">Item</code>·then·becomes·a·<em>trigger</em>·for·sequential·tracing.·This·means1850 The·activated·<code·class="inline">Item</code>·then·becomes·a·<em>trigger</em>·for·sequential·tracing.·This·means
1851 that·if·the·item·is·called·on·a·process·with·trace·flag·<code·class="inline">call</code>·set,·the·process1851 that·if·the·item·is·called·on·a·process·with·trace·flag·<code·class="inline">call</code>·set,·the·process
1852 is·&quot;contaminated&quot;·with·token·<code·class="inline">seq_trace</code>.</p><p>If·<code·class="inline">Flags·=·all</code>,·all·possible·flags·are·set.</p><p>The·possible·values·for·<code·class="inline">SeqTraceFlag</code>·are·available·in·<a·href="../../../../lib/kernel-10.2.6/doc/html/seq_trace.html"><code·class="inline">seq_trace</code></a>.</p><p>For·a·description·of·the·<code·class="inline">match_spec()</code>·syntax,·see·section1852 is·&quot;contaminated&quot;·with·token·<code·class="inline">seq_trace</code>.</p><p>If·<code·class="inline">Flags·=·all</code>,·all·possible·flags·are·set.</p><p>The·possible·values·for·<code·class="inline">SeqTraceFlag</code>·are·available·in·<a·href="../../../../lib/kernel-10.2.6/doc/html/seq_trace.html"><code·class="inline">seq_trace</code></a>.</p><p>For·a·description·of·the·<code·class="inline">match_spec()</code>·syntax,·see·section
1853 <a·href="../../../../erts-15.2.6/doc/html/match_spec.html"><code·class="inline">Match·Specifications·in·Erlang</code></a>·in·ERTS,·which1853 <a·href="../../../../erts-15.2.6/doc/html/match_spec.html"><code·class="inline">Match·Specifications·in·Erlang</code></a>·in·ERTS,·which
1854 explains·the·general·match·specification·&quot;language&quot;.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·<em>system·tracer</em>·for·sequential·tracing·is·automatically·initiated·by·<code·class="inline">ttb</code>1854 explains·the·general·match·specification·&quot;language&quot;.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·<em>system·tracer</em>·for·sequential·tracing·is·automatically·initiated·by·<code·class="inline">ttb</code>
1855 when·a·trace·port·is·started·with·<code·class="inline">ttb:tracer/0,1,2</code>.</p></section><p>An·example·of·how·to·use·function·<code·class="inline">seq_trigger_ms/0,1</code>·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(tiger@durin)5&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tracer</span><span·class="p"·data-group-id="7785672593-1">(</span><span·class="p"·data-group-id="7785672593-1">)</span><span·class="p">.</span><span·class="w">1855 when·a·trace·port·is·started·with·<code·class="inline">ttb:tracer/0,1,2</code>.</p></section><p>An·example·of·how·to·use·function·<code·class="inline">seq_trigger_ms/0,1</code>·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">(tiger@durin)5&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tracer</span><span·class="p"·data-group-id="8907684018-1">(</span><span·class="p"·data-group-id="8907684018-1">)</span><span·class="p">.</span><span·class="w">
1856 </span><span·class="p"·data-group-id="7785672593-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7785672593-3">[</span><span·class="ss">tiger@durin</span><span·class="p"·data-group-id="7785672593-3">]</span><span·class="p"·data-group-id="7785672593-2">}</span><span·class="gp·unselectable">1856 </span><span·class="p"·data-group-id="8907684018-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8907684018-3">[</span><span·class="ss">tiger@durin</span><span·class="p"·data-group-id="8907684018-3">]</span><span·class="p"·data-group-id="8907684018-2">}</span><span·class="gp·unselectable">
1857 (tiger@durin)6&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">p</span><span·class="p"·data-group-id="7785672593-4">(</span><span·class="ss">all</span><span·class="p">,</span><span·class="ss">call</span><span·class="p"·data-group-id="7785672593-4">)</span><span·class="p">.</span><span·class="w">1857 (tiger@durin)6&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">p</span><span·class="p"·data-group-id="8907684018-4">(</span><span·class="ss">all</span><span·class="p">,</span><span·class="ss">call</span><span·class="p"·data-group-id="8907684018-4">)</span><span·class="p">.</span><span·class="w">
1858 </span><span·class="p"·data-group-id="7785672593-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7785672593-6">{</span><span·class="p"·data-group-id="7785672593-7">[</span><span·class="ss">all</span><span·class="p"·data-group-id="7785672593-7">]</spa[·...·truncated·by·diffoscope;·len:·254,·SHA:·e71ef2019170d17d7ebdc4178a4f0ff28ff9b9c97e0c68e327c5063a8f106f8b·...·]-5">}</span><span·class="gp·unselectable">1858 </span><span·class="p"·data-group-id="8907684018-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8907684018-6">{</span><span·class="p"·data-group-id="8907684018-7">[</span><span·class="ss">all</span><span·class="p"·data-group-id="8907684018-7">]</spa[·...·truncated·by·diffoscope;·len:·254,·SHA:·1a621af3444f0b968dccc054eaf7ec075c2e8d87eddd3e0568100350834f9208·...·]-5">}</span><span·class="gp·unselectable">
1859 (tiger@durin)7&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tp</span><span·class="p"·data-group-id="7785672593-9">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="ss">func</span><span·class="p">,</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">seq_trigger_ms</span><span·class="p"·data-group-id="7785672593-[·...·truncated·by·diffoscope;·len:·107,·SHA:·96b43d1eea47532e79d5ff5a6a69ae1399a7c5e9e3b45e386fbd929d91faa101·...·]-9">)</span><span·class="p">.</span><span·class="w">1859 (tiger@durin)7&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tp</span><span·class="p"·data-group-id="8907684018-9">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="ss">func</span><span·class="p">,</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">seq_trigger_ms</span><span·class="p"·data-group-id="8907684018-[·...·truncated·by·diffoscope;·len:·107,·SHA:·64e8dcfa98d4a239c51e14b2662856802e7fa47d54724edeae9273f93045164a·...·]-9">)</span><span·class="p">.</span><span·class="w">
1860 </span><span·class="p"·data-group-id="7785672593-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7785672593-12">[</span><span·class="p"·data-group-id="7785672593-13">{</span><span·class="ss">matched</span><span·class="p">,</span><span·class="mi">1</[·...·truncated·by·diffoscope;·len:·364,·SHA:·dc5c0ad4d7b2202f0ee1f814c6b952a564aaaf4c710acb8a4571293525933226·...·]-11">}</span><span·class="w">1860 </span><span·class="p"·data-group-id="8907684018-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8907684018-12">[</span><span·class="p"·data-group-id="8907684018-13">{</span><span·class="ss">matched</span><span·class="p">,</span><span·class="mi">1</[·...·truncated·by·diffoscope;·len:·364,·SHA:·8b6399c45a499bd957f24f27ccfd1cb75a48689a7cc1c5082609ef7a48f79048·...·]-11">}</span><span·class="w">
1861 </span><span·class="p"·data-group-id="7785672593-15">(</span><span·class="ss">tiger@durin</span><span·class="p"·data-group-id="7785672593-15">)</span><span·class="mi">8</span><span·class="o">&gt;</span></code></pre><p>Whenever·<code·class="inline">mod:func(...)</code>·is·called·after·this,·token·<code·class="inline">seq_trace</code>·is·set·on·the1861 </span><span·class="p"·data-group-id="8907684018-15">(</span><span·class="ss">tiger@durin</span><span·class="p"·data-group-id="8907684018-15">)</span><span·class="mi">8</span><span·class="o">&gt;</span></code></pre><p>Whenever·<code·class="inline">mod:func(...)</code>·is·called·after·this,·token·<code·class="inline">seq_trace</code>·is·set·on·the
1862 executing·process.</p>1862 executing·process.</p>
1863 ··</section>1863 ··</section>
1864 </section>1864 </section>
1865 <section·class="detail"·id="start_trace/4">1865 <section·class="detail"·id="start_trace/4">
  
1866 ··<div·class="detail-header">1866 ··<div·class="detail-header">
1867 ····<a·href="#start_trace/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1867 ····<a·href="#start_trace/4"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1891, 22 lines modifiedOffset 1891, 22 lines modified
1891 ·························TracerOpts·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),1891 ·························TracerOpts·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),
1892 ·························Result·::·{ok,·[{<a·href="#t:item/0">item</a>(),·<a·href="#t:match_desc/0">match_desc</a>()}]}.</pre>1892 ·························Result·::·{ok,·[{<a·href="#t:item/0">item</a>(),·<a·href="#t:match_desc/0">match_desc</a>()}]}.</pre>
  
1893 ······</div>1893 ······</div>
  
1894 <p>This·function·is·a·shortcut·allowing·to·start·a·trace·with·one·command.·Each1894 <p>This·function·is·a·shortcut·allowing·to·start·a·trace·with·one·command.·Each
1895 tuple·in·<code·class="inline">Patterns</code>·is·converted·to·a·list,·which·in·turn·is·passed·to1895 tuple·in·<code·class="inline">Patterns</code>·is·converted·to·a·list,·which·in·turn·is·passed·to
1896 <code·class="inline">ttb:tpl/2,3,4</code>.</p><p>The·call:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">start_trace</span><span·class="p"·data-group-id="8894067242-1">(</span><span·class="p"·data-group-id="8894067242-2">[</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherNode</span><span·class="p"·data-group-id="8894067242-2">]</span><span·class="p">,</span><span·class="w">1896 <code·class="inline">ttb:tpl/2,3,4</code>.</p><p>The·call:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">start_trace</span><span·class="p"·data-group-id="4171444522-1">(</span><span·class="p"·data-group-id="4171444522-2">[</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OtherNode</span><span·class="p"·data-group-id="4171444522-2">]</span><span·class="p">,</span><span·class="w">
1897 ··················</span><span·class="p"·data-group-id="8894067242-3">[</span><span·class="p"·data-group-id="8894067242-4">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·497,·SHA:·f89d922f7d321e82a70b88782a850033000cc08b62f3b42e22365587ec2b8e8b·...·]2-3">]</span><span·class="p">,</span><span·class="w">1897 ··················</span><span·class="p"·data-group-id="4171444522-3">[</span><span·class="p"·data-group-id="4171444522-4">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·497,·SHA:·9e03701166876476a5806fe24e62882426238bd20dc6e98754cb9a346d48ef98·...·]2-3">]</span><span·class="p">,</span><span·class="w">
1898 ··················</span><span·class="p"·data-group-id="8894067242-7">{</span><span·class="ss">all</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">call</span><span·class="p"·data-group-id="8894067242-7">}</span><span·class="p">,</span><span·class="w">1898 ··················</span><span·class="p"·data-group-id="4171444522-7">{</span><span·class="ss">all</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">call</span><span·class="p"·data-group-id="4171444522-7">}</span><span·class="p">,</span><span·class="w">
1899 ··················</span><span·class="p"·data-group-id="8894067242-8">[</span><span·class="p"·data-group-id="8894067242-9">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="8894067242-9">}</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·1093,·SHA:·865117d8b8e6d5658af6924c71b2dd363e0fadab8a4376741c8023dddd0afbc5·...·]55-2">]</span><span·class="p">,</span><span·class="w">1899 ··················</span><span·class="p"·data-group-id="4171444522-8">[</span><span·class="p"·data-group-id="4171444522-9">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="4171444522-9">}</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·1093,·SHA:·ab1d8e5e55fec450b63d48fc37c1146cb94af0cb80244f04556e5155d6d6d572·...·]55-2">]</span><span·class="p">,</span><span·class="w">
1900 ··················</span><span·class="p"·data-group-id="6816473755-3">[</span><span·class="p"·data-group-id="6816473755-4">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="6816473755-4">}</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·586,·SHA:·81f36bbd03915ded193572738832c02de7ff619b2890d646285abaf9c863896a·...·]55-1">)</span><span·class="p">,</span><span·class="w">1900 ··················</span><span·class="p"·data-group-id="2213018655-3">[</span><span·class="p"·data-group-id="2213018655-4">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">File</span><span·class="p"·data-group-id="2213018655-4">}</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·586,·SHA:·1e46e75b7e720bbf45313745557c8cd45c430a54ead586044e5cafe3c13c35db·...·]55-1">)</span><span·class="p">,</span><span·class="w">
1901 </span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tpl</span><span·class="p"·data-group-id="6816473755-7">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6816473755-8">[</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·61,·SHA:·5d6aba264723896e98738a0a0ab5ee409e592033ca109e673da47956fab1e677·...·]55-7">)</span><span·class="p">,</span><span·class="w">1901 </span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tpl</span><span·class="p"·data-group-id="2213018655-7">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2213018655-8">[</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·61,·SHA:·303757e100422b5afcc684f7235a5725a8bed2ab075d6a15229d6405d0636fd1·...·]55-7">)</span><span·class="p">,</span><span·class="w">
1902 </span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tpl</span><span·class="p"·data-group-id="6816473755-9">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·136,·SHA:·b0e13cf5edcb0e818110d49cb1225481292e831d2629345ab9b3a84b859ccc90·...·]55-9">)</span><span·class="p">,</span><span·class="w">1902 </span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">tpl</span><span·class="p"·data-group-id="2213018655-9">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·136,·SHA:·ae052c9b1d178523b6264ef90bd52e60562a1ab77b5f6f5ff1d9a777147e3c02·...·]55-9">)</span><span·class="p">,</span><span·class="w">
1903 </span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">p</span><span·class="p"·data-group-id="6816473755-11">(</span><span·class="ss">all</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">call</span><span·class="p"·data-group-id="6816473755-11">)</span><span·class="p">.</span></code></pre>1903 </span><span·class="nc">ttb</span><span·class="p">:</span><span·class="nf">p</span><span·class="p"·data-group-id="2213018655-11">(</span><span·class="ss">all</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">call</span><span·class="p"·data-group-id="2213018655-11">)</span><span·class="p">.</span></code></pre>
1904 ··</section>1904 ··</section>
1905 </section>1905 </section>
1906 <section·class="detail"·id="stop/0">1906 <section·class="detail"·id="stop/0">
  
1907 ··<div·class="detail-header">1907 ··<div·class="detail-header">
1908 ····<a·href="#stop/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1908 ····<a·href="#stop/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1909 ······<i·class="ri-link-m"·aria-hidden="true"></i>1909 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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2441 ········Built·using2441 ········Built·using
2442 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2442 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2443 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2443 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2444 ······</p>2444 ······</p>
2445 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2445 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2446 ····</footer>2446 ····</footer>
2447 ··</div>2447 ··</div>
2448 </main>2448 </main>
2449 </div>2449 </div>
2450 <script>2450 <script>
2451 ··function·mermaidLoaded()·{2451 ··function·mermaidLoaded()·{
2452 ····mermaid.initialize({2452 ····mermaid.initialize({
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144 ········Built·using144 ········Built·using
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147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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185 ······</p>185 ······</p>
186 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>186 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
190 </div>190 </div>
191 <script>191 <script>
192 ··function·mermaidLoaded()·{192 ··function·mermaidLoaded()·{
193 ····mermaid.initialize({193 ····mermaid.initialize({
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272 ······</p>272 ······</p>
273 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>273 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
274 ····</footer>274 ····</footer>
275 ··</div>275 ··</div>
276 </main>276 </main>
277 </div>277 </div>
278 <script>278 <script>
279 ··function·mermaidLoaded()·{279 ··function·mermaidLoaded()·{
280 ····mermaid.initialize({280 ····mermaid.initialize({
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267 ······<p·class="built-using">267 ······<p·class="built-using">
268 ········Built·using268 ········Built·using
269 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the269 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
270 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>270 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
271 ······</p>271 ······</p>
272 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>272 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
273 ····</footer>273 ····</footer>
274 ··</div>274 ··</div>
275 </main>275 </main>
276 </div>276 </div>
277 <script>277 <script>
278 ··function·mermaidLoaded()·{278 ··function·mermaidLoaded()·{
279 ····mermaid.initialize({279 ····mermaid.initialize({
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153 ··<span·class="text">Using·the·Erlang·API</span>153 ··<span·class="text">Using·the·Erlang·API</span>
154 </h2>154 </h2>
155 <p>The·following·dialog·within·the·Erlang·shell·illustrates·the·functionality·of155 <p>The·following·dialog·within·the·Erlang·shell·illustrates·the·functionality·of
156 the·Erlang·ODBC·interface.·The·table·used·in·the·example·does·not·have·any156 the·Erlang·ODBC·interface.·The·table·used·in·the·example·does·not·have·any
157 relevance·to·anything·that·exist·in·reality,·it·is·just·a·simple·example.·The157 relevance·to·anything·that·exist·in·reality,·it·is·just·a·simple·example.·The
158 example·was·created·using·<code·class="inline">sqlserver·7.0·with·servicepack·1</code>·as·database·and·the158 example·was·created·using·<code·class="inline">sqlserver·7.0·with·servicepack·1</code>·as·database·and·the
159 ODBC·driver·for·<code·class="inline">sqlserver</code>·with·version·<code·class="inline">2000.80.194.00</code>.</p><pre><code·class="text">·1·&gt;·odbc:start().159 ODBC·driver·for·<code·class="inline">sqlserver</code>·with·version·<code·class="inline">2000.80.194.00</code>.</p><pre><code·class="text">·1·&gt;·odbc:start().
160 ······ok</code></pre><p>Connect·to·the·database</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4299880054-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ref</span><span·class="p"·data-group-id="4299880054-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="4299880054-2">(</span><span·class="s">&quot;DSN=sql-server;UID=aladdin;PWD=sesame&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4299880054-3">[</span><span·class="p"·data-group-id="4299880054-3">]</span><span·class="p"·data-group-id="4299880054-2">)</span><span·class="p">.</span><span·class="w"> 
161 ······</span><span·class="p"·data-group-id="4299880054-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.342</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p[·...·truncated·by·diffoscope;·len:·165,·SHA:·e708a20cab1e51c6ec50b3335e3085c914d34ff00a76ea3f5ac4f26af157dd22·...·]160 ······ok</code></pre><p>Connect·to·the·database</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="80806363[·...·truncated·by·diffoscope;·len:·694,·SHA:·1330521d67ed46e1486d6bb7fd9d674afea9f680dffe4998d39fccbcff3eddde·...·]
 161 ······</span><span·class="p"·data-group-id="8080636346-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.342</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="8080636346-4">}</span></code></pre><p>Create·a·table</p><pre><code·class="text">·3·&gt;·odbc:sql_query(Ref,·&quot;CREATE·TABLE·EMPLOYEE·(NR·integer,
162 ······FIRSTNAME··char·varying(20),·LASTNAME··char·varying(20),·GENDER·char(1),162 ······FIRSTNAME··char·varying(20),·LASTNAME··char·varying(20),·GENDER·char(1),
163 ······PRIMARY·KEY(NR))&quot;).163 ······PRIMARY·KEY(NR))&quot;).
164 ······{updated,undefined}</code></pre><p>Insert·some·data</p><pre><code·class="text">·4·&gt;·odbc:sql_query(Ref,·&quot;INSERT·INTO·EMPLOYEE·VALUES(1,·'Jane',·'Doe',·'F')&quot;).164 ······{updated,undefined}</code></pre><p>Insert·some·data</p><pre><code·class="text">·4·&gt;·odbc:sql_query(Ref,·&quot;INSERT·INTO·EMPLOYEE·VALUES(1,·'Jane',·'Doe',·'F')&quot;).
165 ······{updated,1}</code></pre><p>Check·what·data·types·the·database·assigned·for·the·columns.·Hopefully·this·is165 ······{updated,1}</code></pre><p>Check·what·data·types·the·database·assigned·for·the·columns.·Hopefully·this·is
166 not·a·surprise,·some·times·it·can·be!·These·are·the·data·types·that·you·should166 not·a·surprise,·some·times·it·can·be!·These·are·the·data·types·that·you·should
167 use·if·you·want·to·do·a·parameterized·query.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">describe_table</span><span·class="p"·data-group-id="6993054977-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;EMPLOYEE&quot;</span><span·class="p"·data-group-id="6993054977-1">)</span><span·class="p">.</span><span·class="w">167 use·if·you·want·to·do·a·parameterized·query.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">describe_table</span><span·class="p"·data-group-id="6316673772-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;EMPLOYEE&quot;</span><span·class="p"·data-group-id="6316673772-1">)</span><span·class="p">.</span><span·class="w">
168 ······</span><span·class="p"·data-group-id="6993054977-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6993054977-3">[</span><span·class="p"·data-group-id="6993054977-4">{</span><span·class="s">&quot;NR&quot;</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·106,·SHA:·9306c4279c9a06c5f9beb1867e57a0a3ebf42c0171e874e65afbde419e6f16a6·...·]-4">}</span><span·class="p">,</span><span·class="w">168 ······</span><span·class="p"·data-group-id="6316673772-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6316673772-3">[</span><span·class="p"·data-group-id="6316673772-4">{</span><span·class="s">&quot;NR&quot;</span><span·class="p">,<[·...·truncated·by·diffoscope;·len:·106,·SHA:·c2efe13579a10a7f096c1a12237565848f2acfdd3818641b4285a1e2927b4d40·...·]-4">}</span><span·class="p">,</span><span·class="w">
169 ············</span><span·class="p"·data-group-id="6993054977-5">{</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6993054977-6">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·113,·SHA:·a010bd91de7ccc9679fc245351b8031e8f3664f1ddd5f5b547ce964a15e77d97·...·]-5">}</span><span·class="p">,</span><span·class="w">169 ············</span><span·class="p"·data-group-id="6316673772-5">{</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6316673772-6">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·113,·SHA:·38250f041185cd558d28c60c819b9784da5ed8e9f3b0871faa6563add877fd92·...·]-5">}</span><span·class="p">,</span><span·class="w">
170 ············</span><span·class="p"·data-group-id="6993054977-7">{</span><span·class="s">&quot;LASTNAME&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6993054977-8">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·112,·SHA:·8b4405059ac5e2b940d0dd7d4cac758472be125e7af092b5fc929385a0be7d4b·...·]-7">}</span><span·class="w">170 ············</span><span·class="p"·data-group-id="6316673772-7">{</span><span·class="s">&quot;LASTNAME&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6316673772-8">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·112,·SHA:·65753e9d82a68d9bcf84787a79fafa75daa0352e2eb8b65e5e28b21bef62bdc5·...·]-7">}</span><span·class="w">
171 ············</span><span·class="p"·data-group-id="6993054977-9">{</span><span·class="s">&quot;GENDER&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6993054977-10">{</span><span·class="ss">sql_char</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·635,·SHA:·ce2ee3fe1aeead5550e8293980eda4c8981edff13c74d2dd809d34497dbf3236·...·]-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="s">&quot;INSERT·INTO·EMPLOYEE·(NR,·FIRSTNAME,·&quot;</span><span·class="w">171 ············</span><span·class="p"·data-group-id="6316673772-9">{</span><span·class="s">&quot;GENDER&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6316673772-10">{</span><span·class="ss">sql_char</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·635,·SHA:·e8019cbf07aca63c4ca02cda8260e0f222d154bb32ad425d570960ac0f33ef54·...·]-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="s">&quot;INSERT·INTO·EMPLOYEE·(NR,·FIRSTNAME,·&quot;</span><span·class="w">
172 ··················</span><span·class="s">&quot;LASTNAME,·GENDER)·VALUES(?,·?,·?,·?)&quot;</span><span·class="p">,</span><span·class="w">172 ··················</span><span·class="s">&quot;LASTNAME,·GENDER)·VALUES(?,·?,·?,·?)&quot;</span><span·class="p">,</span><span·class="w">
173 ···················</span><span·class="p"·data-group-id="7708043579-2">[</span><span·class="p"·data-group-id="7708043579-3">{</span><span·class="ss">sql_integer</span><span·class="p">,</span><span·class="p"·data-group-id="7708043579-4">[</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</[·...·truncated·by·diffoscope;·len:·344,·SHA:·6060b9ba8b5d768e41502a51f1e28a90aab65db43c3dfdb5def1afc1d64e999a·...·]-3">}</span><span·class="p">,</span><span·class="w">173 ···················</span><span·class="p"·data-group-id="3057046788-2">[</span><span·class="p"·data-group-id="3057046788-3">{</span><span·class="ss">sql_integer</span><span·class="p">,</span><span·class="p"·data-group-id="3057046788-4">[</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</[·...·truncated·by·diffoscope;·len:·344,·SHA:·716b275d5e33c62985d3f451b10beacaaa69640c0468725193f202597a23bed2·...·]-3">}</span><span·class="p">,</span><span·class="w">
174 ····················</span><span·class="p"·data-group-id="7708043579-5">{</span><span·class="p"·data-group-id="7708043579-6">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="7708043579-6">}</span><span·class="p">,</span><span·class="w">174 ····················</span><span·class="p"·data-group-id="3057046788-5">{</span><span·class="p"·data-group-id="3057046788-6">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="3057046788-6">}</span><span·class="p">,</span><span·class="w">
175 ·····························</span><span·class="p"·data-group-id="7708043579-7">[</span><span·class="s">&quot;John&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Ross&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="w">175 ·····························</span><span·class="p"·data-group-id="3057046788-7">[</span><span·class="s">&quot;John&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Ross&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="w">
176 ·····························</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Louise&quot;</span><span·class="p"·data-group-id="7708043579-7">]</span><span·class="p"·data-group-id="7708043579-5">}</span><span·class="p">,</span><span·class="w">176 ·····························</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Louise&quot;</span><span·class="p"·data-group-id="3057046788-7">]</span><span·class="p"·data-group-id="3057046788-5">}</span><span·class="p">,</span><span·class="w">
177 ···················</span><span·class="p"·data-group-id="7708043579-8">{</span><span·class="p"·data-group-id="7708043579-9">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="7708043579-9">}</span><span·class="p">,</span><span·class="w">177 ···················</span><span·class="p"·data-group-id="3057046788-8">{</span><span·class="p"·data-group-id="3057046788-9">{</span><span·class="ss">sql_varchar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">20</span><span·class="p"·data-group-id="3057046788-9">}</span><span·class="p">,</span><span·class="w">
178 ·····························</span><span·class="p"·data-group-id="7708043579-10">[</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Green&quot;</span><span·class="p">,</span><span·class="w">178 ·····························</span><span·class="p"·data-group-id="3057046788-10">[</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Green&quot;</span><span·class="p">,</span><span·class="w">
179 ······························</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Lane&quot;</span><span·class="p"·data-group-id="7708043579-10">]</span><span·class="p"·data-group-id="7708043579-8">}</span><span·class="p">,</span><span·class="w">179 ······························</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Lane&quot;</span><span·class="p"·data-group-id="3057046788-10">]</span><span·class="p"·data-group-id="3057046788-8">}</span><span·class="p">,</span><span·class="w">
180 ···················</span><span·class="p"·data-group-id="7708043579-11">{</span><span·class="p"·data-group-id="7708043579-12">{</span><span·class="ss">sql_char</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7708043579-12">}</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·680,·SHA:·ed2e58ed5e65739664657ea5e0f709d93ebc832ff27da30dc2ab9d03af1045ad·...·]-1">)</span><span·class="p">.</span><span·class="w">180 ···················</span><span·class="p"·data-group-id="3057046788-11">{</span><span·class="p"·data-group-id="3057046788-12">{</span><span·class="ss">sql_char</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="3057046788-12">}</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·680,·SHA:·44455a2e20350059f143e7565c38f04f1a3c946f7ac98f4dc3db74389a2690cb·...·]-1">)</span><span·class="p">.</span><span·class="w">
181 ······</span><span·class="p"·data-group-id="7708043579-14">{</span><span·class="ss">updated</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">7</span><span·class="p"·data-group-id="7708043579-14">}</span></code></pre><p>Fetch·all·data·in·the·table·employee</p><pre><code·class="m[·...·truncated·by·diffoscope;·len:·439,·SHA:·bccb675f7f836963d485a29842e444007fe2c3261fa304b86ecda6def2db28ed·...·]-1">)</span><span·class="p">.</span><span·class="w">181 ······</span><span·class="p"·data-group-id="3057046788-14">{</span><span·class="ss">updated</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">7</span><span·class="p"·data-group-id="3057046788-14">}</span></code></pre><p>Fetch·all·data·in·the·table·employee</p><pre><code·class="m[·...·truncated·by·diffoscope;·len:·439,·SHA:·5f856facf45d4fa8241f3969d077fc91559b29656aca8d883dee361abb1e708d·...·]-1">)</span><span·class="p">.</span><span·class="w">
182 ····</span><span·class="p"·data-group-id="8295751357-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="8295751357-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·b37e0b0e6d57f6e7de71a168b4dd58f91a1a61fe224816180ec1992296fcef5b·...·]-3">]</span><span·class="p">,</span><span·class="w">182 ····</span><span·class="p"·data-group-id="6967004799-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="6967004799-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·b2bda777aacf4ccfb1070681f8d19c7d1760cd684105a9bc73dc643c19af0c9e·...·]-3">]</span><span·class="p">,</span><span·class="w">
183 ··········</span><span·class="p"·data-group-id="8295751357-4">[</span><span·class="p"·data-group-id="8295751357-5">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·c[·...·truncated·by·diffoscope;·len:·70,·SHA:·60eb3e6777f49fdd15014de6e224dc51f23428beeabaf2334b7a7b5ed6f68f76·...·]-5">}</span><span·class="p">,</span><span·class="w">183 ··········</span><span·class="p"·data-group-id="6967004799-4">[</span><span·class="p"·data-group-id="6967004799-5">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·c[·...·truncated·by·diffoscope;·len:·70,·SHA:·37d51911ec5b0531c487b56dc687fccfe6be83d0762579eee170d6eb5aa78ab9·...·]-5">}</span><span·class="p">,</span><span·class="w">
184 ···········</span><span·class="p"·data-group-id="8295751357-6">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p">,</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·class="s">&quot;M&quot;</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·9bb31dfc471596de5d3b747ce91401b9f1a5d6aae2c9ba882d46ee1a331cd5f1·...·]-6">}</span><span·class="p">,</span><span·class="w">184 ···········</span><span·class="p"·data-group-id="6967004799-6">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p">,</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·class="s">&quot;M&quot;</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·ef746ceb9344f4ea0591c094b61e06331b6253e0c2a1d72e6cc128b508f579e4·...·]-6">}</span><span·class="p">,</span><span·class="w">
185 ···········</span><span·class="p"·data-group-id="8295751357-7">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·a2d90cf46da2ffdf29f2a10a3d64a4ba2d72a5d0312cd7139598861744caf8fd·...·]-7">}</span><span·class="p">,</span><span·class="w">185 ···········</span><span·class="p"·data-group-id="6967004799-7">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·a8b6d6fc1200b7be22bf199f3d2b176840aafd27e55fef301469b1e9b9dd1271·...·]-7">}</span><span·class="p">,</span><span·class="w">
186 ···········</span><span·class="p"·data-group-id="8295751357-8">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="s">&quot;Ross&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="s">&quot;M&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·c1b4b265ba13bff578a2ad544f7de45748cf68247ada5a2282a0d089fe9d9344·...·]-8">}</span><span·class="p">,</span><span·class="w">186 ···········</span><span·class="p"·data-group-id="6967004799-8">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="s">&quot;Ross&quot;</span><span·class="p">,</span><span·class="s">&quot;Geller&quot;</span><span·class="p">,</span><span·class="s">&quot;M&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·e0cd30a93053f6dc0c4b27f819bbc27889ee7d4dabd24338aecee1103dcd086c·...·]-8">}</span><span·class="p">,</span><span·class="w">
187 ···········</span><span·class="p"·data-group-id="8295751357-9">{</span><span·class="mi">5</span><span·class="p">,</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="s">&quot;Green&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·6aa27c54d842014de52be456adbcacf35c08837d5e07ee692863ec152b67855c·...·]-9">}</span><span·class="p">,</span><span·class="w">187 ···········</span><span·class="p"·data-group-id="6967004799-9">{</span><span·class="mi">5</span><span·class="p">,</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="s">&quot;Green&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·a223072488f3577844b742b2f849689a21a1d84251e0508f2b49c26673d304ba·...·]-9">}</span><span·class="p">,</span><span·class="w">
188 ···········</span><span·class="p"·data-group-id="8295751357-10">{</span><span·class="mi">6</span><span·class="p">,</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·03bf8c0f8ab0201d020ca069ebc9e28ab5a22f3ab1822b1de1e228152236f401·...·]-10">}</span><span·class="p">,</span><span·class="w">188 ···········</span><span·class="p"·data-group-id="6967004799-10">{</span><span·class="mi">6</span><span·class="p">,</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·8cebd822aec668ca4bfe75b6080e95a2615ab56c7c36d94c94c83bbbf4592f5e·...·]-10">}</span><span·class="p">,</span><span·class="w">
189 ···········</span><span·class="p"·data-group-id="8295751357-11">{</span><span·class="mi">7</span><span·class="p">,</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·d46ae9dd04a63130a95cf37cf39c4084d68a51ac88e825148b65308c57e0857b·...·]-11">}</span><span·class="p">,</span><span·class="w">189 ···········</span><span·class="p"·data-group-id="6967004799-11">{</span><span·class="mi">7</span><span·class="p">,</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="s">&quot;Halliwell&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·6d8ab1a99f4cf50312c3bd5e4f51dfc3c8e223cb3caca21c05a64ea6d0da6d3c·...·]-11">}</span><span·class="p">,</span><span·class="w">
190 ···········</span><span·class="p"·data-group-id="8295751357-12">{</span><span·class="mi">8</span><span·class="p">,</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="s">&quot;Lane&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·152,·SHA:·f77a4f8ba2ee75f0f464f720b2dc38e288bd656261cb66ed742e15307e3aceaf·...·]-2">}</span></code></pre><p>Associate·a·result·set·containing·the·whole·table·<code·class="inline">EMPLOYEE</code>·to·the·connection.190 ···········</span><span·class="p"·data-group-id="6967004799-12">{</span><span·class="mi">8</span><span·class="p">,</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="s">&quot;Lane&quot;</span><span·class="p">,</span><span·class="s">&quot;F&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·152,·SHA:·ec6b7e01bf750bb00d5b0c8bebb8078ae743c57048f266ba7959bd4f0dea3694·...·]-2">}</span></code></pre><p>Associate·a·result·set·containing·the·whole·table·<code·class="inline">EMPLOYEE</code>·to·the·connection.
191 The·number·of·rows·in·the·result·set·is·returned.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">8</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select_count</span><span·class="p"·data-group-id="8881819515-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·*·FROM·EMPLOYEE&quot;</span><span·class="p"·data-group-id="8881819515-1">)</span><span·class="p">.</span><span·class="w">191 The·number·of·rows·in·the·result·set·is·returned.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">8</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select_count</span><span·class="p"·data-group-id="7521352120-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·*·FROM·EMPLOYEE&quot;</span><span·class="p"·data-group-id="7521352120-1">)</span><span·class="p">.</span><span·class="w">
192 ······</span><span·class="p"·data-group-id="8881819515-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="8881819515-2">}</span></code></pre><p>You·can·always·traverse·the·result·set·sequential·by·using·next</p><pre><code·class="makeu[·...·truncated·by·diffoscope;·len:·349,·SHA:·35bdf52ff9f2767e79da8976ee8231266153c1bb0bee0c0acc1d80ec9528f004·...·]-1">)</span><span·class="p">.</span><span·class="w">192 ······</span><span·class="p"·data-group-id="7521352120-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="7521352120-2">}</span></code></pre><p>You·can·always·traverse·the·result·set·sequential·by·using·next</p><pre><code·class="makeu[·...·truncated·by·diffoscope;·len:·349,·SHA:·d7092f67e51c5a85633d86feaafb95fb1f375c47aff96697cc5eb57869c9c213·...·]-1">)</span><span·class="p">.</span><span·class="w">
193 ······</span><span·class="p"·data-group-id="0805885971-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="0805885971-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1050,·SHA:·76fe9cac8c962e18fe6e9c45c67f6e04f3396318064f6de5125d49e41825f63c·...·]-1">)</span><span·class="p">.</span><span·class="w">193 ······</span><span·class="p"·data-group-id="2846183970-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="2846183970-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1050,·SHA:·f90d5a317f392513168c5403dc47ba09d3d8a1680920a60060acda10016758ac·...·]-1">)</span><span·class="p">.</span><span·class="w">
194 ······</span><span·class="p"·data-group-id="4264143956-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="4264143956-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·652,·SHA:·df539153e370d5ceb414bd1cf4333bf2ad1b9161c69176d29ac38cc6a23a7793·...·]-2">}</span></code></pre><p>If·your·driver·supports·scrollable·cursors·you·have·a·little·more·freedom,·and194 ······</span><span·class="p"·data-group-id="5301074841-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="5301074841-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·652,·SHA:·3cafa0a9a042cd8045b20a3ad6d05af0b0a330ef7332429f53331ecb4f0cd8b9·...·]-2">}</span></code></pre><p>If·your·driver·supports·scrollable·cursors·you·have·a·little·more·freedom,·and
195 can·do·things·like·this.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">11</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">last</span><span·class="p"·data-group-id="8171652447-1">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="8171652447-1">)</span><span·class="p">.</span><span·class="w">195 can·do·things·like·this.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">11</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">last</span><span·class="p"·data-group-id="5275067477-1">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="5275067477-1">)</span><span·class="p">.</span><span·class="w">
196 ······</span><span·class="p"·data-group-id="8171652447-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="8171652447-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1053,·SHA:·ef75b72de0c46abcba08f8e7b68aad318a0cc55ae7f62e5e7b18e14e70917374·...·]-1">)</span><span·class="p">.</span><span·class="w">196 ······</span><span·class="p"·data-group-id="5275067477-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="5275067477-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1053,·SHA:·234be7b929da433e988a6e3b290a4aca4c84ec0534c629a11e294c14c850ab02·...·]-1">)</span><span·class="p">.</span><span·class="w">
197 ······</span><span·class="p"·data-group-id="1828706854-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="1828706854-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1057,·SHA:·fe044b5cca33d8f2b256f021eb8f2b2996f06e113624e978f941b6ccc39d04a8·...·]-1">)</span><span·class="p">.</span><span·class="w">197 ······</span><span·class="p"·data-group-id="8672409152-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="8672409152-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1057,·SHA:·9e5393ada22157d3fe2bce482793ec967a7fb6a4c8a0528bfb5198d80e6c93ea·...·]-1">)</span><span·class="p">.</span><span·class="w">
198 ······</span><span·class="p"·data-group-id="5388064424-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="5388064424-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1050,·SHA:·c28336f67aa7bf520ed56adbc745b93534f8d0bee39447aa30d11fbfc1728b85·...·]-1">)</span><span·class="p">.</span><span·class="w">198 ······</span><span·class="p"·data-group-id="7125381756-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="7125381756-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1050,·SHA:·7d227b38712eaf6a33ef68f0af38969cf77a10fe4bd1dacaa3502934172bb151·...·]-1">)</span><span·class="p">.</span><span·class="w">
199 ······</span><span·class="p"·data-group-id="6892934195-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="6892934195-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1318,·SHA:·81b7a51a3c3f6deace0750e6395dd43d397c97498932d3907571d9ad3e98aa4f·...·]-1">)</span><span·class="p">.</span><span·class="w">199 ······</span><span·class="p"·data-group-id="7505471541-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="7505471541-3">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·1318,·SHA:·3b37b4cf273c0e5e8f6d12722f3b479284fb78a095c9f8d5d6baafbf015273d9·...·]-1">)</span><span·class="p">.</span><span·class="w">
200 ·····</span><span·class="p"·data-group-id="8594804733-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="8594804733-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·ec57694694147a809b4f1cd717065f126621de4707f808bbc5a7db061f16bd8f·...·]-3">]</span><span·class="p">,</span><span·class="w">200 ·····</span><span·class="p"·data-group-id="5234585666-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="5234585666-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·6bbe99b557267ae276299c036f810219907a6ef9d76b10efc916dcdec81e66c4·...·]-3">]</span><span·class="p">,</span><span·class="w">
201 ··········</span><span·class="p"·data-group-id="8594804733-4">[</span><span·class="p"·data-group-id="8594804733-5">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="8594804733-5">}</span><span·class="p">,</span><span·class="w">201 ··········</span><span·class="p"·data-group-id="5234585666-4">[</span><span·class="p"·data-group-id="5234585666-5">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5234585666-5">}</span><span·class="p">,</span><span·class="w">
202 ···········</span><span·class="p"·data-group-id="8594804733-6">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="8594804733-6">}</span><span·class="p">,</span><span·class="w">202 ···········</span><span·class="p"·data-group-id="5234585666-6">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="5234585666-6">}</span><span·class="p">,</span><span·class="w">
203 ···········</span><span·class="p"·data-group-id="8594804733-7">{</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="8594804733-7">}</span><span·class="p">,</span><span·class="w">203 ···········</span><span·class="p"·data-group-id="5234585666-7">{</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="5234585666-7">}</span><span·class="p">,</span><span·class="w">
204 ···········</span><span·class="p"·data-group-id="8594804733-8">{</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="8594804733-8">}</span><span·class="p">,</span><span·class="w">204 ···········</span><span·class="p"·data-group-id="5234585666-8">{</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5234585666-8">}</span><span·class="p">,</span><span·class="w">
205 ···········</span><span·class="p"·data-group-id="8594804733-9">{</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="8594804733-9">}</span><span·class="p">,</span><span·class="w">205 ···········</span><span·class="p"·data-group-id="5234585666-9">{</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="5234585666-9">}</span><span·class="p">,</span><span·class="w">
206 ···········</span><span·class="p"·data-group-id="8594804733-10">{</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="8594804733-10">}</span><span·class="p"·data-group-id="8594804733-4">]</span><span·class="p"·data-group-id="85948[·...·truncated·by·diffoscope;·len:·5,·SHA:·062dd20f4565ddfe925b85969ff8b4308c31ee020ad0ca7eaa13b8a9a6f93471·...·]-2">}</span></code></pre><p>Fetch·the·fields·<code·class="inline">FIRSTNAME</code>and·<code·class="inline">NR</code>for·all·female·employees·and·sort·them·on206 ···········</span><span·class="p"·data-group-id="5234585666-10">{</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="5234585666-10">}</span><span·class="p"·data-group-id="5234585666-4">]</span><span·class="p"·data-group-id="52345[·...·truncated·by·diffoscope;·len:·5,·SHA:·ae119ffb0c566a72c139802656695ae593a0f0e91ce874478852e22df541d901·...·]-2">}</span></code></pre><p>Fetch·the·fields·<code·class="inline">FIRSTNAME</code>and·<code·class="inline">NR</code>for·all·female·employees·and·sort·them·on
207 the·field·<code·class="inline">FIRSTNAME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">16</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">sql_query</span><span·class="p"·data-group-id="9514137324-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·FIRSTNAME,·NR·FROM·EMPLOYEE·WHERE·GENDER·=·&#39;F&#39;207 the·field·<code·class="inline">FIRSTNAME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">16</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">sql_query</span><span·class="p"·data-group-id="9479262632-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·FIRSTNAME,·NR·FROM·EMPLOYEE·WHERE·GENDER·=·&#39;F&#39;
208 ······ORDER·BY·FIRSTNAME&quot;</span><span·class="p"·data-group-id="9514137324-1">)</span><span·class="p">.</span><span·class="w">208 ······ORDER·BY·FIRSTNAME&quot;</span><span·class="p"·data-group-id="9479262632-1">)</span><span·class="p">.</span><span·class="w">
209 ····</span><span·class="p"·data-group-id="9514137324-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="9514137324-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·b11ba6443a2374d971426d09a676132536065a31e14375c19f135ec63fa1f50f·...·]-3">]</span><span·class="p">,</span><span·class="w">209 ····</span><span·class="p"·data-group-id="9479262632-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="9479262632-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·a4c911b72716789269ab53c569d28f523c1723f3de56de5f9f28a35a8f383e8a·...·]-3">]</span><span·class="p">,</span><span·class="w">
210 ··········</span><span·class="p"·data-group-id="9514137324-4">[</span><span·class="p"·data-group-id="9514137324-5">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="9514137324-5">}</span><span·class="p">,</span><span·class="w">210 ··········</span><span·class="p"·data-group-id="9479262632-4">[</span><span·class="p"·data-group-id="9479262632-5">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="9479262632-5">}</span><span·class="p">,</span><span·class="w">
211 ···········</span><span·class="p"·data-group-id="9514137324-6">{</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="9514137324-6">}</span><span·class="p">,</span><span·class="w">211 ···········</span><span·class="p"·data-group-id="9479262632-6">{</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="9479262632-6">}</span><span·class="p">,</span><span·class="w">
212 ···········</span><span·class="p"·data-group-id="9514137324-7">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9514137324-7">}</span><span·class="p">,</span><span·class="w">212 ···········</span><span·class="p"·data-group-id="9479262632-7">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9479262632-7">}</span><span·class="p">,</span><span·class="w">
213 ···········</span><span·class="p"·data-group-id="9514137324-8">{</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="9514137324-8">}</span><span·class="p">,</span><span·class="w">213 ···········</span><span·class="p"·data-group-id="9479262632-8">{</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="9479262632-8">}</span><span·class="p">,</span><span·class="w">
214 ···········</span><span·class="p"·data-group-id="9514137324-9">{</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="9514137324-9">}</span><span·class="p">,</span><span·class="w">214 ···········</span><span·class="p"·data-group-id="9479262632-9">{</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="9479262632-9">}</span><span·class="p">,</span><span·class="w">
215 ···········</span><span·class="p"·data-group-id="9514137324-10">{</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9514137324-10">}</span><span·class="p"·data-group-id="9514137324-4">]</span><span·class="p"·data-group-id="951413[·...·truncated·by·diffoscope;·len:·4,·SHA:·11c74eb793a0b17efc3b328611f8c28388cd8d4ebe9118943510155a32f6232d·...·]-2">}</span></code></pre><p>Associate·a·result·set·that·contains·the·fields·<code·class="inline">FIRSTNAME</code>·and·<code·class="inline">NR</code>for·all215 ···········</span><span·class="p"·data-group-id="9479262632-10">{</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9479262632-10">}</span><span·class="p"·data-group-id="9479262632-4">]</span><span·class="p"·data-group-id="947926[·...·truncated·by·diffoscope;·len:·4,·SHA:·994aa605e86d263f1818ca1cec63a70b694f492aa906560e90ca193ef4dc181d·...·]-2">}</span></code></pre><p>Associate·a·result·set·that·contains·the·fields·<code·class="inline">FIRSTNAME</code>·and·<code·class="inline">NR</code>for·all
216 female·employees·to·the·connection.·The·number·of·rows·in·the·result·set·is216 female·employees·to·the·connection.·The·number·of·rows·in·the·result·set·is
217 returned.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">17</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select_count</span><span·class="p"·data-group-id="0154463773-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·FIRSTNAME,·NR·FROM·EMPLOYEE·WHERE·GENDER·=·&#39;F&#39;&quot;</span><span·class="p"·data-group-id="0154463773-1">)</span><span·class="p">.</span><span·class="w">217 returned.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">17</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select_count</span><span·class="p"·data-group-id="7402800291-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·FIRSTNAME,·NR·FROM·EMPLOYEE·WHERE·GENDER·=·&#39;F&#39;&quot;</span><span·class="p"·data-group-id="7402800291-1">)</span><span·class="p">.</span><span·class="w">
218 ······</span><span·class="p"·data-group-id="0154463773-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="0154463773-2">}</span></code></pre><p>A·few·more·ways·of·retrieving·parts·of·the·result·set·when·the·driver·supports218 ······</span><span·class="p"·data-group-id="7402800291-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="7402800291-2">}</span></code></pre><p>A·few·more·ways·of·retrieving·parts·of·the·result·set·when·the·driver·supports
219 scrollable·cursors.·Note·that·next·will·work·even·without·support·for·scrollable219 scrollable·cursors.·Note·that·next·will·work·even·without·support·for·scrollable
220 cursors.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">18</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="9596216877-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9596216877-2">{</span><span·class="ss">relative</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·165,·SHA:·668f2f9ec35af83924f717401b188ddad77d11a68d5a07b759f6cb1d643dadba·...·]-1">)</span><span·class="p">.</span><span·class="w">220 cursors.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">18</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="7770394540-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7770394540-2">{</span><span·class="ss">relative</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·165,·SHA:·f5e6af9eea65e78c2f282db48e6626d93693ae7c0701b1fb0d7b8ad0ecb88219·...·]-1">)</span><span·class="p">.</span><span·class="w">
221 ····</span><span·class="p"·data-group-id="9596216877-3">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="9596216877-4">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data-group-id="9596216877-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="9596216877-5">[</span><span·class="p"·data-group-id="9596216877-6">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9596216877-6">}</span><span·class="p">,</span><span·class="p"·data-group-id="9596216877-7">{</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="9596216877-7">}</span><span·class="p">,</span><span·class="p"·data-group-id="9596216877-8">{</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="9596216877-8">}</span><span·class="p"·data-group-id="9596216877-5">]</span><span·class="p"·data-group-id="9596216877-3">}</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">19</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="9443832171-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">next</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="9443832171-1">)</span><span·class="p">.</span><span·class="w"> 
222 ······</span><span·class="p"·data-group-id="9443832171-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="9443832171-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data-group-id="9443832171-3">]</span><span·class="p">,</span><span·class="p"·data-group-id="9443832171-4">[</span><span·class="p"·data-group-id="9443832171-5">{</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="9443832171-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="9443832171-6">{</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="9443832171-6">}</span><span·class="p"·data-group-id="9443832171-4">]</span><span·class="p"·data-group-id="9443832171-2">}</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">20</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="3076946522-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3076946522-2">{</span><span·class="ss">absolute</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="3076946522-2">}</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="3076946522-1">)</span><span·class="p">.</span><span·class="w"> 
223 ······</span><span·class="p"·data-group-id="3076946522-3">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="3076946522-4">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&[·...·truncated·by·diffoscope;·len:·1207,·SHA:·6489c7e55c1b5620632b26821bf3c70aced44751ea18b3be742d914155315be6·...·]-1">)</span><span·class="p">.</span><span·class="w">221 ····</span><span·class="p"·data-group-id="7770394540-3">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="7770394540-4">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&qu[·...·truncated·by·diffoscope;·len:·1426,·SHA:·cae42ddac0a0ec996feb672f54ddf2f2fce81f2f323b18748a70e3de05ff8eec·...·]-1">)</span><span·class="p">.</span><span·class="w">
 222 ······</span><span·class="p"·data-group-id="9108505458-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="9108505458-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data-group-id="9108505458-3">]</span><span·class="p">,</span><span·class="p"·data-group-id="9108505458-4">[</span><span·class="p"·data-group-id="9108505458-5">{</span><span·class="s">&quot;Prue&quot;</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="9108505458-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="9108505458-6">{</span><span·class="s">&quot;Louise&quot;</span><span·class="p">,</span><span·class="mi">8</span><span·class="p"·data-group-id="9108505458-6">}</span><span·class="p"·data-group-id="9108505458-4">]</span><span·class="p"·data-group-id="9108505458-2">}</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">20</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="0834420035-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0834420035-2">{</span><span·class="ss">absolute</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0834420035-2">}</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="0834420035-1">)</span><span·class="p">.</span><span·class="w">
 223 ······</span><span·class="p"·data-group-id="0834420035-3">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="0834420035-4">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data-group-id="0834420035-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="0834420035-5">[</span><span·class="p"·data-group-id="0834420035-6">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0834420035-6">}</span><span·class="p">,</span><span·class="p"·data-group-id="0834420035-7">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="0834420035-7">}</span><span·class="p"·data-group-id="0834420035-5">]</span><span·class="p"·data-group-id="0834420035-3">}</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">21</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="0427257649-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">next</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="0427257649-1">)</span><span·class="p">.</span><span·class="w">
224 ····</span><span·class="p"·data-group-id="7793716051-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="7793716051-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·1351,·SHA:·3a396ba9033df91fc76732da440e1abd95e19386f8844c42662f434048b97623·...·]-1">)</span><span·class="p">.</span><span·class="w">224 ····</span><span·class="p"·data-group-id="0427257649-2">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="0427257649-3">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·1351,·SHA:·af2dcbd74186add11c9a61cf6ac43f7a0f448a1d001df5abd9ecdc324beb5489·...·]-1">)</span><span·class="p">.</span><span·class="w">
225 ······</span><span·class="p"·data-group-id="1687203775-3">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="1687203775-4">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·f2b2fc11c3362b06fad65f8c3484b72ec62b5e048418fbd4756c1d3b96860b1e·...·]-4">]</span><span·class="p">,</span><span·class="w">225 ······</span><span·class="p"·data-group-id="6873083458-3">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="6873083458-4">[</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</span><span·class="s">&quot;NR&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·690ee8d4b1a1d53cef04a5327a41575bc6975b8d0660f99e6a4d56c5feca3f11·...·]-4">]</span><span·class="p">,</span><span·class="w">
226 ················</span><span·class="p"·data-group-id="1687203775-5">[</span><span·class="p"·data-group-id="1687203775-6">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1687203775-6">}</span><span·class="p">,</span><span·class="p"·data-group-id="1687203775-7">{</span><span·class="s">&quot;Monica&quot;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="1687203775-7">}</span><span·class="p">,</span><span·class="p"·data-group-id="1687203775-8">{</span><span·class="s">&quot;Rachel&quot;</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="1687203775-8">}</span><span·class="p">,</span><span·class="p"·data-group-id="1687203775-9">{</span><span·class="s">&quot;Piper&quot;</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="1687203775-9">}</span><span·class="p"·data-group-id="1687203775-5">]</span><span·class="p"·data-group-id="1687203775-3">}</span></code></pre><p>Select,·using·a·parameterized·query.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">23</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">param_query</span><span·class="p"·data-group-id="7154381079-1">(</span><span·class="n">Ref</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SELECT·*·FROM·EMPLOYEE·WHERE·GENDER=?&quot;</span><span·class="p">,</span><span·class="w"> 
227 ······</span><span·class="p"·data-group-id="7154381079-2">[</span><span·class="p"·data-group-id="7154381079-3">{</span><span·class="p"·data-group-id="7154381079-4">{</span><span·class="ss">sql_char</span><span·class="p">,</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·434,·SHA:·24a8f2451c51fbc108c80a9582eed1c01c3f40ce0e9f2919a3b20a63e710b136·...·]</span><span·class="w">226 ················</span><span·class="p"·data-group-id="6873083458-5">[</span><span·class="p"·data-group-id="6873083458-6">{</span><span·class="s">&quot;Jane&quot;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="6873083458-6">[·...·truncated·by·diffoscope;·len:·1305,·SHA:·97e7f9c1416d0ecf0cf41accecdcd81e26f55eb3037f19c9be209e996a1b6f7f·...·]</span><span·class="w">
 227 ······</span><span·class="p"·data-group-id="2149718041-2">[</span><span·class="p"·data-group-id="2149718041-3">{</span><span·class="p"·data-group-id="2149718041-4">{</span><span·class="ss">sql_char</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="2149718041-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2149718041-5">[</span><span·class="s">&quot;M&quot;</span><span·class="p"·data-group-id="2149718041-5">]</span><span·class="p"·data-group-id="2149718041-3">}</span><span·class="p"·data-group-id="2149718041-2">]</span><span·class="p"·data-group-id="2149718041-1">)</span><span·class="p">.</span><span·class="w">
228 ······</span><span·class="p"·data-group-id="7154381079-6">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="7154381079-7">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·7b5909a4f4a543b6e58028d46272601efa8b5e7f6dd39cbb2ed8fd2f86c04d49·...·]-7">]</span><span·class="p">,</span><span·class="w">228 ······</span><span·class="p"·data-group-id="2149718041-6">{</span><span·class="ss">selected</span><span·class="p">,</span><span·class="p"·data-group-id="2149718041-7">[</span><span·class="s">&quot;NR&quot;</span><span·class="p">,</span><span·class="s">&quot;FIRSTNAME&quot;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·1f03f028978cb0efce8e6b794f86a9f3e53c5b81d99946fa4ef8ae97437d536e·...·]-7">]</span><span·class="p">,</span><span·class="w">
229 ················</span><span·class="p"·data-group-id="7154381079-8">[</span><span·class="p"·data-group-id="7154381079-9">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Doe&quot;</span><span·c[·...·truncated·by·diffoscope;·len:·569,·SHA:·38e50adb1215b1d49961bb390d67cca3cd8bdc5acd3018f025243e2efb2d7d64·...·]-6">}</span></code></pre><p>Delete·the·table·<code·class="inline">EMPLOYEE</code>.</p><pre><code·class="text">·24·&gt;·odbc:sql_query(Ref,·&quot;DROP·TABLE·EMPLOYEE&quot;).229 ················</span><span·class="p"·data-group-id="2149718041-8">[</span><span·class="p"·data-group-id="2149718041-9">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Doe&quot;</span><span·c[·...·truncated·by·diffoscope;·len:·569,·SHA:·75a020f9c91304f870a82c06b002f7ebeb24ea890504dfc78a43c07db3012365·...·]-6">}</span></code></pre><p>Delete·the·table·<code·class="inline">EMPLOYEE</code>.</p><pre><code·class="text">·24·&gt;·odbc:sql_query(Ref,·&quot;DROP·TABLE·EMPLOYEE&quot;).
230 ······{updated,undefined}</code></pre><p>Shut·down·the·connection.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">25</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="4040660863-1">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="4040660863-1">)</span><span·class="p">.</span><span·class="w">230 ······{updated,undefined}</code></pre><p>Shut·down·the·connection.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">25</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">odbc</span><span·class="p">:</span><span·class="nf">disconnect</span><span·class="p"·data-group-id="0819492984-1">(</span><span·class="n">Ref</span><span·class="p"·data-group-id="0819492984-1">)</span><span·class="p">.</span><span·class="w">
231 ······</span><span·class="ss">ok</span></code></pre><p>Shut·down·the·application.</p><pre><code·class="text">·26·&gt;·odbc:stop().231 ······</span><span·class="ss">ok</span></code></pre><p>Shut·down·the·application.</p><pre><code·class="text">·26·&gt;·odbc:stop().
232 ····=INFO·REPORT====·7-Jan-2004::17:00:59·===232 ····=INFO·REPORT====·7-Jan-2004::17:00:59·===
233 ····application:·odbc233 ····application:·odbc
234 ····exited:·stopped234 ····exited:·stopped
235 ····type:·temporary235 ····type:·temporary
  
236 ····ok</code></pre>236 ····ok</code></pre>
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282 ········Built·using282 ········Built·using
283 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the283 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
284 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>284 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
285 ······</p>285 ······</p>
286 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>286 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
287 ····</footer>287 ····</footer>
288 ··</div>288 ··</div>
289 </main>289 </main>
290 </div>290 </div>
291 <script>291 <script>
292 ··function·mermaidLoaded()·{292 ··function·mermaidLoaded()·{
293 ····mermaid.initialize({293 ····mermaid.initialize({
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147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
153 ····mermaid.initialize({153 ····mermaid.initialize({
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143 ······<p·class="built-using">143 ······<p·class="built-using">
144 ········Built·using144 ········Built·using
145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the145 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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191 ········Built·using191 ········Built·using
192 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the192 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
193 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>193 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
194 ······</p>194 ······</p>
195 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>195 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
196 ····</footer>196 ····</footer>
197 ··</div>197 ··</div>
198 </main>198 </main>
199 </div>199 </div>
200 <script>200 <script>
201 ··function·mermaidLoaded()·{201 ··function·mermaidLoaded()·{
202 ····mermaid.initialize({202 ····mermaid.initialize({
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Offset 169, 21 lines modifiedOffset 169, 21 lines modified
169 <code·class="inline">error_location</code>·is·set·to·<code·class="inline">line</code>).</p></li></ul><p>The·code·must·return:</p><ul><li><p><strong><code·class="inline">{token,Token}</code></strong>·-·Return·<code·class="inline">Token</code>·to·the·caller.</p></li><li><p><strong><code·class="inline">{end_token,Token}</code></strong>·-·Return·<code·class="inline">Token</code>·and·is·last·token·in·a·tokens·call.</p></li><li><p><strong><code·class="inline">skip_token</code></strong>·-·Skip·this·token·completely.</p></li><li><p><strong><code·class="inline">{error,ErrString}</code></strong>·-·An·error·in·the·token,·<code·class="inline">ErrString</code>·is·a·string169 <code·class="inline">error_location</code>·is·set·to·<code·class="inline">line</code>).</p></li></ul><p>The·code·must·return:</p><ul><li><p><strong><code·class="inline">{token,Token}</code></strong>·-·Return·<code·class="inline">Token</code>·to·the·caller.</p></li><li><p><strong><code·class="inline">{end_token,Token}</code></strong>·-·Return·<code·class="inline">Token</code>·and·is·last·token·in·a·tokens·call.</p></li><li><p><strong><code·class="inline">skip_token</code></strong>·-·Skip·this·token·completely.</p></li><li><p><strong><code·class="inline">{error,ErrString}</code></strong>·-·An·error·in·the·token,·<code·class="inline">ErrString</code>·is·a·string
170 describing·the·error.</p></li></ul><p>It·is·also·possible·to·push·back·characters·into·the·input·characters·with·the170 describing·the·error.</p></li></ul><p>It·is·also·possible·to·push·back·characters·into·the·input·characters·with·the
171 following·returns:</p><ul><li><code·class="inline">{token,Token,PushBackList}</code></li><li><code·class="inline">{end_token,Token,PushBackList}</code></li><li><code·class="inline">{skip_token,PushBackList}</code></li></ul><p>These·have·the·same·meanings·as·the·normal·returns·but·the·characters·in171 following·returns:</p><ul><li><code·class="inline">{token,Token,PushBackList}</code></li><li><code·class="inline">{end_token,Token,PushBackList}</code></li><li><code·class="inline">{skip_token,PushBackList}</code></li></ul><p>These·have·the·same·meanings·as·the·normal·returns·but·the·characters·in
172 <code·class="inline">PushBackList</code>·will·be·prepended·to·the·input·characters·and·scanned·for·the172 <code·class="inline">PushBackList</code>·will·be·prepended·to·the·input·characters·and·scanned·for·the
173 next·token.·Note·that·pushing·back·a·newline·will·mean·the·line·numbering·will173 next·token.·Note·that·pushing·back·a·newline·will·mean·the·line·numbering·will
174 no·longer·be·correct.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Pushing·back·characters·gives·you·unexpected·possibilities·to·cause·the174 no·longer·be·correct.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Pushing·back·characters·gives·you·unexpected·possibilities·to·cause·the
175 scanner·to·loop!</p></section><p>The·following·example·would·match·a·simple·Erlang·integer·or·float·and·return·a175 scanner·to·loop!</p></section><p>The·following·example·would·match·a·simple·Erlang·integer·or·float·and·return·a
176 token·which·could·be·sent·to·the·Erlang·parser:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">D</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4708971976-1">[</span><span·class="mi">0</span><span·class="o">-</span><span·class="mi">9</span><span·class="p"·data-group-id="4708971976-1">]</span><span·class="w">176 token·which·could·be·sent·to·the·Erlang·parser:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">D</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2290188616-1">[</span><span·class="mi">0</span><span·class="o">-</span><span·class="mi">9</span><span·class="p"·data-group-id="2290188616-1">]</span><span·class="w">
  
177 </span><span·class="p"·data-group-id="4708971976-2">{</span><span·class="n">D</span><span·class="p"·data-group-id="4708971976-2">}</span><span·class="o">+</span><span·class="w">·</span><span·class="p">:</span><span·class="w">177 </span><span·class="p"·data-group-id="2290188616-2">{</span><span·class="n">D</span><span·class="p"·data-group-id="2290188616-2">}</span><span·class="o">+</span><span·class="w">·</span><span·class="p">:</span><span·class="w">
178 ··</span><span·class="p"·data-group-id="4708971976-3">{</span><span·class="ss">token</span><span·class="p">,</span><span·class="p"·data-group-id="4708971976-4">{</span><span·class="ss">integer</span><span·class="p">,</span><span·class="n">TokenLine</span><span·class="p">,</span><span·class="nf">[·...·truncated·by·diffoscope;·len:·254,·SHA:·d85eaad4ae990c0ff55293209003a9acb8dd04cab00a7e48c4abae13c5a29229·...·]6-3">}</span><span·class="p">.</span><span·class="w">178 ··</span><span·class="p"·data-group-id="2290188616-3">{</span><span·class="ss">token</span><span·class="p">,</span><span·class="p"·data-group-id="2290188616-4">{</span><span·class="ss">integer</span><span·class="p">,</span><span·class="n">TokenLine</span><span·class="p">,</span><span·class="nf">[·...·truncated·by·diffoscope;·len:·254,·SHA:·6007e8e4164ae212d287229bda18a92c6970f5646cabc250a6c39d7827f89109·...·]6-3">}</span><span·class="p">.</span><span·class="w">
  
179 </span><span·class="p"·data-group-id="4708971976-6">{</span><span·class="n">D</span><span·class="p"·data-group-id="4708971976-6">}</span><span·class="o">+</span><span·class="err">\</span><span·class="p">.</span><span·class="p"·data-group-id="4708971976-7">{</span><span·class="n">D</span><span·class="p"·data-group-id="4708971976-7">}</span><span·class="o">+</span><span·class="p"·data-group-id="4708971976-8">(</span><span·class="p"·data-group-id="4708971976-9">(</span><span·class="n">E</span><span·class="p">|</span><span·class="ss">e</span><span·class="p"·data-group-id="4708971976-9">)</span><span·class="p"·data-group-id="4708971976-10">(</span><span·class="err">\</span><span·class="o">+</span><span·class="p">|</span><span·class="err">\</span><span·class="o">-</span><span·class="p"·data-group-id="4708971976-10">)</span><span·class="o">?</span><span·class="p"·data-group-id="4708971976-11">{</span><span·class="n">D</span><span·class="p"·data-group-id="4708971976-11">}</span><span·class="o">+</span><span·class="p"·data-group-id="4708971976-8">)</span><span·class="o">?</span><span·class="w">·</span><span·class="p">:</span><span·class="w"> 
180 ··</span><span·class="p"·data-group-id="4708971976-12">{</span><span·class="ss">token</span><span·class="p">,</span><span·class="p"·data-group-id="4708971976-13">{</span><span·class="nb">float</span><span·class="p">,</span><span·class="n">TokenLine</span><[·...·truncated·by·diffoscope;·len:·452,·SHA:·79379a19a75bf22e9c94db59cb90e62919c0163e25fb535be0713aa69c75a594·...·]179 </span><span·class="p"·data-group-id="2290188616-6">{</span><span·class="n">D</span><span·class="p"·data-group-id="2290188616-6">}</span><span·class="o">+</span><span·class="err">\</span><span·class="p">.</span><span·class="p"·data-group-id="2290188616-7">[·...·truncated·by·diffoscope;·len:·894,·SHA:·cd9252f29e2497166ed0bc19e12f9ee3633e261806b2b4108aaed5783c41b23e·...·]
 180 ··</span><span·class="p"·data-group-id="2290188616-12">{</span><span·class="ss">token</span><span·class="p">,</span><span·class="p"·data-group-id="2290188616-13">{</span><span·class="nb">float</span><span·class="p">,</span><span·class="n">TokenLine</span><span·class="p">,</span><span·class="nf">list_to_float</span><span·class="p"·data-group-id="2290188616-14">(</span><span·class="n">TokenChars</span><span·class="p"·data-group-id="2290188616-14">)</span><span·class="p"·data-group-id="2290188616-13">}</span><span·class="p"·data-group-id="2290188616-12">}</span><span·class="p">.</span></code></pre><p>The·Erlang·code·in·the·<code·class="inline">Erlang·code.</code>·section·is·written·into·the·output·file
181 directly·after·the·module·declaration·and·predefined·exports·declaration,·making181 directly·after·the·module·declaration·and·predefined·exports·declaration,·making
182 it·possible·to·add·extra·exports,·define·imports,·and·other·attributes,·which·are182 it·possible·to·add·extra·exports,·define·imports,·and·other·attributes,·which·are
183 visible·in·the·whole·file.</p><h2·id="module-regular-expressions"·class="section-heading">183 visible·in·the·whole·file.</p><h2·id="module-regular-expressions"·class="section-heading">
184 ··<a·href="#module-regular-expressions"·class="hover-link">184 ··<a·href="#module-regular-expressions"·class="hover-link">
185 ····<i·class="ri-link-m"·aria-hidden="true"></i>185 ····<i·class="ri-link-m"·aria-hidden="true"></i>
186 ··</a>186 ··</a>
187 ··<span·class="text">Regular·Expressions</span>187 ··<span·class="text">Regular·Expressions</span>
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707 <p>This·is·a·re-entrant·call·to·try·and·scan·a·single·token·from·<code·class="inline">Chars</code>.</p><p>If·there·are·enough·characters·in·<code·class="inline">Chars</code>·to·either·scan·a·token·or707 <p>This·is·a·re-entrant·call·to·try·and·scan·a·single·token·from·<code·class="inline">Chars</code>.</p><p>If·there·are·enough·characters·in·<code·class="inline">Chars</code>·to·either·scan·a·token·or
708 detect·an·error·then·this·will·be·returned·with708 detect·an·error·then·this·will·be·returned·with
709 <code·class="inline">{done,...}</code>.·Otherwise·<code·class="inline">{cont,Cont}</code>·will·be·returned·where·<code·class="inline">Cont</code>·is709 <code·class="inline">{done,...}</code>.·Otherwise·<code·class="inline">{cont,Cont}</code>·will·be·returned·where·<code·class="inline">Cont</code>·is
710 used·in·the·next·call·to·<code·class="inline">token()</code>·with·more·characters·to·try·an·scan710 used·in·the·next·call·to·<code·class="inline">token()</code>·with·more·characters·to·try·an·scan
711 the·token.·This·is·continued·until·a·token·has·been·scanned.·<code·class="inline">Cont</code>·is711 the·token.·This·is·continued·until·a·token·has·been·scanned.·<code·class="inline">Cont</code>·is
712 initially·<code·class="inline">[]</code>.</p><p>It·is·not·designed·to·be·called·directly·by·an·application,·but·is712 initially·<code·class="inline">[]</code>.</p><p>It·is·not·designed·to·be·called·directly·by·an·application,·but·is
713 used·through·the·I/O·system·where·it·can·typically·be·called·in·an713 used·through·the·I/O·system·where·it·can·typically·be·called·in·an
714 application·by:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="4037525564-1">(</span><span·class="n">InFile</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4037525564-2">{</span><span·class="ss">get_until</span><span·class="p">,</span><span·class="ss">unicode</span><span·class="p">[·...·truncated·by·diffoscope;·len:·393,·SHA:·6b1b8c87b756609deec832630da9d71bd516964d8334dcf1914784fadb530703·...·]-1">)</span><span·class="w">714 application·by:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="2644328579-1">(</span><span·class="n">InFile</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2644328579-2">{</span><span·class="ss">get_until</span><span·class="p">,</span><span·class="ss">unicode</span><span·class="p">[·...·truncated·by·diffoscope;·len:·393,·SHA:·70254c7ea8e428b5a1deb24572af2dfcdbf3d9b2e900ec76db7de5130fb0a735·...·]-1">)</span><span·class="w">
715 ··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">TokenRet</span></code></pre>715 ··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">TokenRet</span></code></pre>
716 ··</section>716 ··</section>
717 </section>717 </section>
718 <section·class="detail"·id="tokens/2">718 <section·class="detail"·id="tokens/2">
  
719 ··<div·class="detail-header">719 ··<div·class="detail-header">
720 ····<a·href="#tokens/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">720 ····<a·href="#tokens/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 792, 15 lines modifiedOffset 792, 15 lines modified
792 scan·the·tokens.·This·is·continued·until·all·tokens·have·been792 scan·the·tokens.·This·is·continued·until·all·tokens·have·been
793 scanned.·<code·class="inline">Cont</code>·is·initially·<code·class="inline">[]</code>.</p><p>This·functions·differs·from·<code·class="inline">token</code>·in·that·it·will·continue·to·scan·tokens·up793 scanned.·<code·class="inline">Cont</code>·is·initially·<code·class="inline">[]</code>.</p><p>This·functions·differs·from·<code·class="inline">token</code>·in·that·it·will·continue·to·scan·tokens·up
794 to·and·including·an·<code·class="inline">{end_token,Token}</code>·has·been·scanned·(see·next·section).·It794 to·and·including·an·<code·class="inline">{end_token,Token}</code>·has·been·scanned·(see·next·section).·It
795 will·then·return·all·the·tokens.·This·is·typically·used·for·scanning·grammars795 will·then·return·all·the·tokens.·This·is·typically·used·for·scanning·grammars
796 like·Erlang·where·there·is·an·explicit·end·token,·<code·class="inline">'.'</code>.·If·no·end·token·is796 like·Erlang·where·there·is·an·explicit·end·token,·<code·class="inline">'.'</code>.·If·no·end·token·is
797 found·then·the·whole·file·will·be·scanned·and·returned.·If·an·error·occurs·then797 found·then·the·whole·file·will·be·scanned·and·returned.·If·an·error·occurs·then
798 all·tokens·up·to·and·including·the·next·end·token·will·be·skipped.</p><p>It·is·not·designed·to·be·called·directly·by·an·application,·but·used·through·the798 all·tokens·up·to·and·including·the·next·end·token·will·be·skipped.</p><p>It·is·not·designed·to·be·called·directly·by·an·application,·but·used·through·the
799 I/O·system·where·it·can·typically·be·called·in·an·application·by:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="9199177298-1">(</span><span·class="n">InFile</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9199177298-2">{</span><span·class="ss">get_until</span><span·class="p">,</span><span·class="ss">unicode</span><span·class="p">[·...·truncated·by·diffoscope;·len:·394,·SHA:·ffd11b3558f7a6b58579a6463095ca028d4d5dbd3407c90cdd969970920de976·...·]-1">)</span><span·class="w">799 I/O·system·where·it·can·typically·be·called·in·an·application·by:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">io</span><span·class="p">:</span><span·class="nf">request</span><span·class="p"·data-group-id="0822538514-1">(</span><span·class="n">InFile</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0822538514-2">{</span><span·class="ss">get_until</span><span·class="p">,</span><span·class="ss">unicode</span><span·class="p">[·...·truncated·by·diffoscope;·len:·394,·SHA:·fd88461194e26d3df81955be7f9814d9a35474393ba7c12dd867fe1d74f575b9·...·]-1">)</span><span·class="w">
800 ··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">TokensRet</span></code></pre>800 ··</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">TokensRet</span></code></pre>
801 ··</section>801 ··</section>
802 </section>802 </section>
  
803 ····</div>803 ····</div>
804 ··</section>804 ··</section>
  
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962 ······<p·class="built-using">962 ······<p·class="built-using">
963 ········Built·using963 ········Built·using
964 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the964 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
965 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>965 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
966 ······</p>966 ······</p>
967 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>967 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
968 ····</footer>968 ····</footer>
969 ··</div>969 ··</div>
970 </main>970 </main>
971 </div>971 </div>
972 <script>972 <script>
973 ··function·mermaidLoaded()·{973 ··function·mermaidLoaded()·{
974 ····mermaid.initialize({974 ····mermaid.initialize({
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733 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>733 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
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735 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>735 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
736 ····</footer>736 ····</footer>
737 ··</div>737 ··</div>
738 </main>738 </main>
739 </div>739 </div>
740 <script>740 <script>
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144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
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158 <code·class="inline">{Category,·Position,·Symbol}</code>.</p><p>If·a·terminal·symbol·is·the·only·member·of·a·category,·and·the·symbol·name·is158 <code·class="inline">{Category,·Position,·Symbol}</code>.</p><p>If·a·terminal·symbol·is·the·only·member·of·a·category,·and·the·symbol·name·is
159 identical·to·the·category·name,·the·token·format·can·be·<code·class="inline">{Symbol,·Position}</code>.</p><p>A·list·of·tokens·produced·by·the·scanner·should·end·with·a·special159 identical·to·the·category·name,·the·token·format·can·be·<code·class="inline">{Symbol,·Position}</code>.</p><p>A·list·of·tokens·produced·by·the·scanner·should·end·with·a·special
160 <code·class="inline">end_of_input</code>·tuple·which·the·parser·is·looking·for.·The·format·of·this·tuple160 <code·class="inline">end_of_input</code>·tuple·which·the·parser·is·looking·for.·The·format·of·this·tuple
161 should·be·<code·class="inline">{Endsymbol,·EndPosition}</code>,·where·<code·class="inline">Endsymbol</code>·is·an·identifier·that·is161 should·be·<code·class="inline">{Endsymbol,·EndPosition}</code>,·where·<code·class="inline">Endsymbol</code>·is·an·identifier·that·is
162 distinguished·from·all·the·terminal·and·non-terminal·categories·of·the·syntax162 distinguished·from·all·the·terminal·and·non-terminal·categories·of·the·syntax
163 rules.·The·<code·class="inline">Endsymbol</code>·can·be·declared·in·the·grammar·file.</p><p>The·simplest·case·is·to·segment·the·input·string·into·a·list·of·identifiers163 rules.·The·<code·class="inline">Endsymbol</code>·can·be·declared·in·the·grammar·file.</p><p>The·simplest·case·is·to·segment·the·input·string·into·a·list·of·identifiers
164 (atoms)·and·use·those·atoms·both·as·categories·and·values·of·the·tokens.·For164 (atoms)·and·use·those·atoms·both·as·categories·and·values·of·the·tokens.·For
165 example,·the·input·string·<code·class="inline">aaa·bbb·777,·X</code>·may·be·scanned·(tokenized)·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7506804678-1">[</span><span·class="p"·data-group-id="7506804678-2">{</span><span·class="ss">aaa</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7506804678-2">}</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·1016,·SHA:·a3fae14f451e9d47e49bca3c0affd11964f9cbca6c1904238b0df6ff8e32e106·...·]-6">}</span><span·class="p">,</span><span·class="w">165 example,·the·input·string·<code·class="inline">aaa·bbb·777,·X</code>·may·be·scanned·(tokenized)·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0485170663-1">[</span><span·class="p"·data-group-id="0485170663-2">{</span><span·class="ss">aaa</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0485170663-2">}</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·1016,·SHA:·5a1d60bbfac9fa2b15ebc610961f54b660757624071601e747a1f1b0bcde1b0c·...·]-6">}</span><span·class="p">,</span><span·class="w">
166 ·</span><span·class="p"·data-group-id="7506804678-7">{</span><span·class="ss">&#39;$end&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7506804678-7">}</span><span·class="p"·data-group-id="7506804678-1">]</span><span·class="p">.</span></code></pre><p>This·assumes·that·this·is·the·first·line·of·the·input·text,·and·that·<code·class="inline">'$end'</code>·is166 ·</span><span·class="p"·data-group-id="0485170663-7">{</span><span·class="ss">&#39;$end&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0485170663-7">}</span><span·class="p"·data-group-id="0485170663-1">]</span><span·class="p">.</span></code></pre><p>This·assumes·that·this·is·the·first·line·of·the·input·text,·and·that·<code·class="inline">'$end'</code>·is
167 the·distinguished·<code·class="inline">end_of_input</code>·symbol.</p><p>The·Erlang·scanner·in·the·<code·class="inline">io</code>·module·can·be·used·as·a·starting·point·when167 the·distinguished·<code·class="inline">end_of_input</code>·symbol.</p><p>The·Erlang·scanner·in·the·<code·class="inline">io</code>·module·can·be·used·as·a·starting·point·when
168 writing·a·new·scanner.·Study·<code·class="inline">yeccscan.erl</code>·in·order·to·see·how·a·filter·can·be168 writing·a·new·scanner.·Study·<code·class="inline">yeccscan.erl</code>·in·order·to·see·how·a·filter·can·be
169 added·on·top·of·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#scan_erl_form/3"><code·class="inline">io:scan_erl_form/3</code></a>·to·provide·a·scanner·for·Yecc·that169 added·on·top·of·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#scan_erl_form/3"><code·class="inline">io:scan_erl_form/3</code></a>·to·provide·a·scanner·for·Yecc·that
170 tokenizes·grammar·files·before·parsing·them·with·the·Yecc·parser.·A·more·general170 tokenizes·grammar·files·before·parsing·them·with·the·Yecc·parser.·A·more·general
171 approach·to·scanner·implementation·is·to·use·a·scanner·generator·such·as171 approach·to·scanner·implementation·is·to·use·a·scanner·generator·such·as
172 <a·href="leex.html"><code·class="inline">leex</code></a>.</p><h2·id="module-grammar-definition-format"·class="section-heading">172 <a·href="leex.html"><code·class="inline">leex</code></a>.</p><h2·id="module-grammar-definition-format"·class="section-heading">
173 ··<a·href="#module-grammar-definition-format"·class="hover-link">173 ··<a·href="#module-grammar-definition-format"·class="hover-link">
Offset 229, 29 lines modifiedOffset 229, 29 lines modified
229 list·-&gt;·'('·')'.229 list·-&gt;·'('·')'.
230 list·-&gt;·'('·elements·')'.230 list·-&gt;·'('·elements·')'.
231 elements·-&gt;·element.231 elements·-&gt;·element.
232 elements·-&gt;·element·elements.232 elements·-&gt;·element·elements.
233 element·-&gt;·atom.233 element·-&gt;·atom.
234 element·-&gt;·list.</code></pre><p>This·grammar·can·be·used·to·generate·a·parser·which·parses·list·expressions,234 element·-&gt;·list.</code></pre><p>This·grammar·can·be·used·to·generate·a·parser·which·parses·list·expressions,
235 such·as·<code·class="inline">(),·(a),·(peter·charles),·(a·(b·c)·d·(())),·...</code>·provided·that·your235 such·as·<code·class="inline">(),·(a),·(peter·charles),·(a·(b·c)·d·(())),·...</code>·provided·that·your
236 scanner·tokenizes,·for·example,·the·input·<code·class="inline">(peter·charles)</code>·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8555732320-1">[</span><span·class="p"·data-group-id="8555732320-2">{</span><span·class="ss">&#39;(&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="8555732320-2">}</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·920,·SHA:·be448dfd9b60870b942ad9b69cd86d9df98c29cff4ea432618301a86f61e3259·...·]-5">}</span><span·class="p">,</span><span·class="w">236 scanner·tokenizes,·for·example,·the·input·<code·class="inline">(peter·charles)</code>·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6187780047-1">[</span><span·class="p"·data-group-id="6187780047-2">{</span><span·class="ss">&#39;(&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="6187780047-2">}</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·920,·SHA:·a760240c836d19e2f50e77958e3b340c6557c8d51bcbbf52215ba5ed73fa083c·...·]-5">}</span><span·class="p">,</span><span·class="w">
237 ·</span><span·class="p"·data-group-id="8555732320-6">{</span><span·class="ss">&#39;$end&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="8555732320-6">}</span><span·class="p"·data-group-id="8555732320-1">]</span></code></pre><p>When·a·grammar·rule·is·used·by·the·parser·to·parse·(part·of)·the·input·string·as237 ·</span><span·class="p"·data-group-id="6187780047-6">{</span><span·class="ss">&#39;$end&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="6187780047-6">}</span><span·class="p"·data-group-id="6187780047-1">]</span></code></pre><p>When·a·grammar·rule·is·used·by·the·parser·to·parse·(part·of)·the·input·string·as
238 a·grammatical·phrase,·the·associated·code·is·evaluated,·and·the·value·of·the238 a·grammatical·phrase,·the·associated·code·is·evaluated,·and·the·value·of·the
239 last·expression·becomes·the·value·of·the·parsed·phrase.·This·value·may·be·used239 last·expression·becomes·the·value·of·the·parsed·phrase.·This·value·may·be·used
240 by·the·parser·later·to·build·structures·that·are·values·of·higher·phrases·of240 by·the·parser·later·to·build·structures·that·are·values·of·higher·phrases·of
241 which·the·current·phrase·is·a·part.·The·values·initially·associated·with241 which·the·current·phrase·is·a·part.·The·values·initially·associated·with
242 terminal·category·phrases,·i.e.·input·tokens,·are·the·token·tuples·themselves.</p><p>Below·is·an·example·of·the·grammar·above·with·structure·building·code·added:</p><pre><code·class="text">list·-&gt;·'('·')'·:·nil.242 terminal·category·phrases,·i.e.·input·tokens,·are·the·token·tuples·themselves.</p><p>Below·is·an·example·of·the·grammar·above·with·structure·building·code·added:</p><pre><code·class="text">list·-&gt;·'('·')'·:·nil.
243 list·-&gt;·'('·elements·')'·:·'$2'.243 list·-&gt;·'('·elements·')'·:·'$2'.
244 elements·-&gt;·element·:·{cons,·'$1',·nil}.244 elements·-&gt;·element·:·{cons,·'$1',·nil}.
245 elements·-&gt;·element·elements·:·{cons,·'$1',·'$2'}.245 elements·-&gt;·element·elements·:·{cons,·'$1',·'$2'}.
246 element·-&gt;·atom·:·'$1'.246 element·-&gt;·atom·:·'$1'.
247 element·-&gt;·list·:·'$1'.</code></pre><p>With·this·code·added·to·the·grammar·rules,·the·parser·produces·the·following247 element·-&gt;·list·:·'$1'.</code></pre><p>With·this·code·added·to·the·grammar·rules,·the·parser·produces·the·following
248 value·(structure)·when·parsing·the·input·string·<code·class="inline">(a·b·c).</code>.·This·still·assumes248 value·(structure)·when·parsing·the·input·string·<code·class="inline">(a·b·c).</code>.·This·still·assumes
249 that·this·was·the·first·input·line·that·the·scanner·tokenized:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7724984171-1">{</span><span·class="ss">cons</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7724984171-2">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·567,·SHA:·4ae798fe8d73ede4eb28c98073c8c952191646bad159025644a5a25ae11a0306·...·]-4">}</span><span·class="p">,</span><span·class="w">249 that·this·was·the·first·input·line·that·the·scanner·tokenized:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6704502946-1">{</span><span·class="ss">cons</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6704502946-2">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·567,·SHA:·c4f8205a02d3a8c5338d5deb35aa5031582f513e7bf1c562a16cd762082a3488·...·]-4">}</span><span·class="p">,</span><span·class="w">
250 ····························</span><span·class="p"·data-group-id="7724984171-5">{</span><span·class="ss">cons</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7724984171-6">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·344,·SHA:·b5144464c71c58f0a287f30562fac038fb127674f277fcc8d571ec5448fb0015·...·]-1">}</span></code></pre><p>The·associated·code·contains·<code·class="inline">pseudo·variables</code>·<code·class="inline">'$1'</code>,·<code·class="inline">'$2'</code>,250 ····························</span><span·class="p"·data-group-id="6704502946-5">{</span><span·class="ss">cons</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6704502946-6">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·344,·SHA:·8108dc472cdf333c4f4f6138195c5ecc24cb38f108fe10efd91f4a1a69cffdf5·...·]-1">}</span></code></pre><p>The·associated·code·contains·<code·class="inline">pseudo·variables</code>·<code·class="inline">'$1'</code>,·<code·class="inline">'$2'</code>,
251 <code·class="inline">'$3'</code>,·and·so·on.··which·refer·to·(are·bound·to)·the·values251 <code·class="inline">'$3'</code>,·and·so·on.··which·refer·to·(are·bound·to)·the·values
252 associated·previously·by·the·parser·with·the·symbols·of·the·right-hand252 associated·previously·by·the·parser·with·the·symbols·of·the·right-hand
253 side·of·the·rule.·When·these·symbols·are·terminal·categories,·the253 side·of·the·rule.·When·these·symbols·are·terminal·categories,·the
254 values·are·token·tuples·of·the·input·string·(see·above).</p><p>The·associated·code·may·not·only·be·used·to·build·structures254 values·are·token·tuples·of·the·input·string·(see·above).</p><p>The·associated·code·may·not·only·be·used·to·build·structures
255 associated·with·phrases,·but·may·also·be·used·for·syntactic·and255 associated·with·phrases,·but·may·also·be·used·for·syntactic·and
256 semantic·tests,·printout·actions·(for·example·for·tracing),·and·so·on256 semantic·tests,·printout·actions·(for·example·for·tracing),·and·so·on
257 during·the·parsing·process.·Since·tokens·contain·positional·(line257 during·the·parsing·process.·Since·tokens·contain·positional·(line
Offset 266, 37 lines modifiedOffset 266, 37 lines modified
266 element·-&gt;·atom·:·'$1'.266 element·-&gt;·atom·:·'$1'.
267 element·-&gt;·list·:·'$1'.</code></pre><h2·id="module-generating-a-parser"·class="section-heading">267 element·-&gt;·list·:·'$1'.</code></pre><h2·id="module-generating-a-parser"·class="section-heading">
268 ··<a·href="#module-generating-a-parser"·class="hover-link">268 ··<a·href="#module-generating-a-parser"·class="hover-link">
269 ····<i·class="ri-link-m"·aria-hidden="true"></i>269 ····<i·class="ri-link-m"·aria-hidden="true"></i>
270 ··</a>270 ··</a>
271 ··<span·class="text">Generating·a·Parser</span>271 ··<span·class="text">Generating·a·Parser</span>
272 </h2>272 </h2>
273 <p>To·call·the·parser·generator,·use·the·following·command:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">yecc</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="9741938797-1">(</span><span·class="n">Grammarfile</span><span·class="p"·data-group-id="9741938797-1">)</span><span·class="p">.</span></code></pre><p>An·error·message·from·Yecc·will·be·shown·if·the·grammar·is·not·of·the·LALR·type273 <p>To·call·the·parser·generator,·use·the·following·command:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">yecc</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="1899323627-1">(</span><span·class="n">Grammarfile</span><span·class="p"·data-group-id="1899323627-1">)</span><span·class="p">.</span></code></pre><p>An·error·message·from·Yecc·will·be·shown·if·the·grammar·is·not·of·the·LALR·type
274 (for·example·too·ambiguous).·Shift/reduce·conflicts·are·resolved·in·favor·of274 (for·example·too·ambiguous).·Shift/reduce·conflicts·are·resolved·in·favor·of
275 shifting·if·there·are·no·operator·precedence·declarations.·Refer·to·the·<code·class="inline">yacc</code>275 shifting·if·there·are·no·operator·precedence·declarations.·Refer·to·the·<code·class="inline">yacc</code>
276 documentation·on·the·use·of·operator·precedence.</p><p>The·output·file·contains·Erlang·source·code·for·a·parser·module·with·module·name276 documentation·on·the·use·of·operator·precedence.</p><p>The·output·file·contains·Erlang·source·code·for·a·parser·module·with·module·name
277 equal·to·the·<code·class="inline">Parserfile</code>·parameter.·After·compilation,·the·parser·can·be·called277 equal·to·the·<code·class="inline">Parserfile</code>·parameter.·After·compilation,·the·parser·can·be·called
278 as·follows·(the·module·name·is·assumed·to·be·<code·class="inline">myparser</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">myparser</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="6462664054-1">(</span><span·class="nc">myscanner</span><span·class="p">:</span><span·class="nf">scan</span><span·class="p"·data-group-id="6462664054-2">(</span><span·class="n">Inport</span><span·class="p"·data-group-id="6462664054-2">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·ea6e47a66d034e9d83a67a76f018a4e0fa669ee32257cef6431d3556ac682038·...·]-1">)</span></code></pre><p>The·call·format·can·be·different·if·a·customized·prologue·file·has·been·included278 as·follows·(the·module·name·is·assumed·to·be·<code·class="inline">myparser</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">myparser</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="2779876782-1">(</span><span·class="nc">myscanner</span><span·class="p">:</span><span·class="nf">scan</span><span·class="p"·data-group-id="2779876782-2">(</span><span·class="n">Inport</span><span·class="p"·data-group-id="2779876782-2">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·c934cc7390b0bb3dd8f212891ed953d50da0179f36cee4c5be6b3b5e06bb0e32·...·]-1">)</span></code></pre><p>The·call·format·can·be·different·if·a·customized·prologue·file·has·been·included
279 when·generating·the·parser·instead·of·the·default·file279 when·generating·the·parser·instead·of·the·default·file
280 <code·class="inline">lib/parsetools/include/yeccpre.hrl</code>.</p><p>With·the·standard·prologue,·this·call·will·return·either·<code·class="inline">{ok,·Result}</code>,·where280 <code·class="inline">lib/parsetools/include/yeccpre.hrl</code>.</p><p>With·the·standard·prologue,·this·call·will·return·either·<code·class="inline">{ok,·Result}</code>,·where
281 <code·class="inline">Result</code>·is·a·structure·that·the·Erlang·code·of·the·grammar·file·has·built,·or281 <code·class="inline">Result</code>·is·a·structure·that·the·Erlang·code·of·the·grammar·file·has·built,·or
282 <code·class="inline">{error,·{Position,·Module,·Message}}</code>·if·there·was·a·syntax·error·in·the·input.</p><p><code·class="inline">Message</code>·is·something·which·may·be·converted·into·a·string·by·calling282 <code·class="inline">{error,·{Position,·Module,·Message}}</code>·if·there·was·a·syntax·error·in·the·input.</p><p><code·class="inline">Message</code>·is·something·which·may·be·converted·into·a·string·by·calling
283 <code·class="inline">Module:format_error(Message)</code>·and·printed·with·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#format/3"><code·class="inline">io:format/3</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>By·default,·the·parser·that·was·generated·will·not·print·out·error·messages·to283 <code·class="inline">Module:format_error(Message)</code>·and·printed·with·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#format/3"><code·class="inline">io:format/3</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>By·default,·the·parser·that·was·generated·will·not·print·out·error·messages·to
284 the·screen.·The·user·will·have·to·do·this·either·by·printing·the·returned284 the·screen.·The·user·will·have·to·do·this·either·by·printing·the·returned
285 error·messages,·or·by·inserting·tests·and·print·instructions·in·the·Erlang285 error·messages,·or·by·inserting·tests·and·print·instructions·in·the·Erlang
286 code·associated·with·the·syntax·rules·of·the·grammar·file.</p></section><p>It·is·also·possible·to·make·the·parser·ask·for·more·input·tokens·when·needed·if286 code·associated·with·the·syntax·rules·of·the·grammar·file.</p></section><p>It·is·also·possible·to·make·the·parser·ask·for·more·input·tokens·when·needed·if
287 the·following·call·format·is·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">myparser</span><span·class="p">:</span><span·class="nf">parse_and_scan</span><span·class="p"·data-group-id="4957577401-1">(</span><span·class="p"·data-group-id="4957577401-2">{</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><span·class="p"·data-group-id="4957577401-2">}</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·53ba719ad8d3994c243a142ae940e8d13e25214e10f5a2f36cfa696ae1587c64·...·]-1">)</span><span·class="w">287 the·following·call·format·is·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">myparser</span><span·class="p">:</span><span·class="nf">parse_and_scan</span><span·class="p"·data-group-id="4408933924-1">(</span><span·class="p"·data-group-id="4408933924-2">{</span><span·class="n">Function</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><span·class="p"·data-group-id="4408933924-2">}</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·0c52566f6b78ae1102329f8982d4e04cdcbd4a87efc4e8ae333b353bda4b0673·...·]-1">)</span><span·class="w">
288 </span><span·class="nc">myparser</span><span·class="p">:</span><span·class="nf">parse_and_scan</span><span·class="p"·data-group-id="4957577401-3">(</span><span·class="p"·data-group-id="4957577401-4">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tokenizer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·6de3220118309dfe0d9a3eafc935b21c218904f442779733e3784e70722bfbd3·...·]-3">)</span></code></pre><p>The·tokenizer·<code·class="inline">Function</code>·is·either·a·fun·or·a·tuple·<code·class="inline">{Mod,·Tokenizer}</code>.·The·call288 </span><span·class="nc">myparser</span><span·class="p">:</span><span·class="nf">parse_and_scan</span><span·class="p"·data-group-id="4408933924-3">(</span><span·class="p"·data-group-id="4408933924-4">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tokenizer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Args</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·5389c055ba2090cf5dcb5764533ad30b875834591a4018bb87d8e6d229f7b910·...·]-3">)</span></code></pre><p>The·tokenizer·<code·class="inline">Function</code>·is·either·a·fun·or·a·tuple·<code·class="inline">{Mod,·Tokenizer}</code>.·The·call
289 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/2"><code·class="inline">apply(Function,·Args)</code></a>·or289 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/2"><code·class="inline">apply(Function,·Args)</code></a>·or
290 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/2"><code·class="inline">apply({Mod,·Tokenizer},·Args)</code></a>·is·executed·whenever·a·new·token·is290 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/2"><code·class="inline">apply({Mod,·Tokenizer},·Args)</code></a>·is·executed·whenever·a·new·token·is
291 needed.·This,·for·example,·makes·it·possible·to·parse·from·a·file,·token·by291 needed.·This,·for·example,·makes·it·possible·to·parse·from·a·file,·token·by
292 token.</p><p>The·tokenizer·used·above·has·to·be·implemented·so·as·to·return·one·of·the292 token.</p><p>The·tokenizer·used·above·has·to·be·implemented·so·as·to·return·one·of·the
293 following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0575723879-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tokens</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EndPosition</span><span·class="p"·data-group-id="0575723879-1">}</span><span·class="w">293 following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2456382288-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tokens</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EndPosition</span><span·class="p"·data-group-id="2456382288-1">}</span><span·class="w">
294 </span><span·class="p"·data-group-id="0575723879-2">{</span><span·class="ss">eof</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EndPosition</span><span·class="p"·data-group-id="0575723879-2">}</span><span·class="w">294 </span><span·class="p"·data-group-id="2456382288-2">{</span><span·class="ss">eof</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EndPosition</span><span·class="p"·data-group-id="2456382288-2">}</span><span·class="w">
295 </span><span·class="p"·data-group-id="0575723879-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error_description</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EndPosition</span><span·class="p"·data-group-id="0575[·...·truncated·by·diffoscope;·len:·6,·SHA:·14f3fce483dc2b837d29f5ba3b0d91c20d3965d0c4e3146ac9c8d8c2cc4b6c80·...·]-3">}</span></code></pre><p>This·conforms·to·the·format·used·by·the·scanner·in·the·Erlang·<code·class="inline">io</code>·library295 </span><span·class="p"·data-group-id="2456382288-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error_description</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EndPosition</span><span·class="p"·data-group-id="2456[·...·truncated·by·diffoscope;·len:·6,·SHA:·9c8ea42478a06f69acb9a251dbfe2f304e3f2f76e7a929dfed1c3fab2c138d02·...·]-3">}</span></code></pre><p>This·conforms·to·the·format·used·by·the·scanner·in·the·Erlang·<code·class="inline">io</code>·library
296 module.</p><p>If·<code·class="inline">{eof,·EndPosition}</code>·is·returned·immediately,·the·call·to·<code·class="inline">parse_and_scan/1</code>296 module.</p><p>If·<code·class="inline">{eof,·EndPosition}</code>·is·returned·immediately,·the·call·to·<code·class="inline">parse_and_scan/1</code>
297 returns·<code·class="inline">{ok,·eof}</code>.·If·<code·class="inline">{eof,·EndPosition}</code>·is·returned·before·the·parser297 returns·<code·class="inline">{ok,·eof}</code>.·If·<code·class="inline">{eof,·EndPosition}</code>·is·returned·before·the·parser
298 expects·end·of·input,·<code·class="inline">parse_and_scan/1</code>·will,·of·course,·return·an·error298 expects·end·of·input,·<code·class="inline">parse_and_scan/1</code>·will,·of·course,·return·an·error
299 message·(see·above).·Otherwise·<code·class="inline">{ok,·Result}</code>·is·returned.</p><h2·id="module-more-examples"·class="section-heading">299 message·(see·above).·Otherwise·<code·class="inline">{ok,·Result}</code>·is·returned.</p><h2·id="module-more-examples"·class="section-heading">
300 ··<a·href="#module-more-examples"·class="hover-link">300 ··<a·href="#module-more-examples"·class="hover-link">
301 ····<i·class="ri-link-m"·aria-hidden="true"></i>301 ····<i·class="ri-link-m"·aria-hidden="true"></i>
302 ··</a>302 ··</a>
Offset 338, 44 lines modifiedOffset 338, 44 lines modified
338 </span><span·class="n">Terminals</span><span·class="w">338 </span><span·class="n">Terminals</span><span·class="w">
339 </span><span·class="ss">atom</span><span·class="w">·</span><span·class="nb">float</span><span·class="w">·</span><span·class="ss">integer</span><span·class="w">·</span><span·class="ss">reserved_symbol</span><span·class="w">·</span><span·class="ss">reserved_word</span><span·class="w">·</span><span·class="ss">string</span><span·class="w">·</span><span·class="ss">char</span><span·class="w">·</span><span·class="ss">var</span><span·class="w">339 </span><span·class="ss">atom</span><span·class="w">·</span><span·class="nb">float</span><span·class="w">·</span><span·class="ss">integer</span><span·class="w">·</span><span·class="ss">reserved_symbol</span><span·class="w">·</span><span·class="ss">reserved_word</span><span·class="w">·</span><span·class="ss">string</span><span·class="w">·</span><span·class="ss">char</span><span·class="w">·</span><span·class="ss">var</span><span·class="w">
340 </span><span·class="ss">&#39;-&gt;&#39;</span><span·class="w">·</span><span·class="ss">&#39;:&#39;</span><span·class="w">·</span><span·class="ss">dot</span><span·class="p">.</span><span·class="w">340 </span><span·class="ss">&#39;-&gt;&#39;</span><span·class="w">·</span><span·class="ss">&#39;:&#39;</span><span·class="w">·</span><span·class="ss">dot</span><span·class="p">.</span><span·class="w">
341 </span><span·class="n">Rootsymbol</span><span·class="w">·</span><span·class="ss">grammar</span><span·class="p">.</span><span·class="w">341 </span><span·class="n">Rootsymbol</span><span·class="w">·</span><span·class="ss">grammar</span><span·class="p">.</span><span·class="w">
342 </span><span·class="n">Endsymbol</span><span·class="w">·</span><span·class="ss">&#39;$end&#39;</span><span·class="p">.</span><span·class="w">342 </span><span·class="n">Endsymbol</span><span·class="w">·</span><span·class="ss">&#39;$end&#39;</span><span·class="p">.</span><span·class="w">
343 </span><span·class="ss">grammar</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">declaration</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">343 </span><span·class="ss">grammar</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">declaration</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
344 </span><span·class="ss">grammar</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">rule</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">344 </span><span·class="ss">grammar</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">rule</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
345 </span><span·class="ss">declaration</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="ss">symbols</span><span·class="w">·</span><span·class="nc">dot</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-1">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="9624424250-1">}</span><span·class="p">.</span><span·class="w">345 </span><span·class="ss">declaration</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="ss">symbols</span><span·class="w">·</span><span·class="nc">dot</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-1">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="4149573604-1">}</span><span·class="p">.</span><span·class="w">
346 </span><span·class="ss">rule</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">head</span><span·class="w">·</span><span·class="ss">&#39;-&gt;&#39;</span><span·class="w">·</span><span·class="ss">symbols</span><span·class="w">·</span><span·class="ss">attached_code</span><span·class="w">·</span><span·class="nc">dot</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-2">{</span><span·class="ss">rule</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·80,·SHA:·8c0e69712ce405a92e59b5881cb1a36530a05735aad6fb74a5fcfc13578717ac·...·]-3">]</span><span·class="p">,</span><span·class="w">346 </span><span·class="ss">rule</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">head</span><span·class="w">·</span><span·class="ss">&#39;-&gt;&#39;</span><span·class="w">·</span><span·class="ss">symbols</span><span·class="w">·</span><span·class="ss">attached_code</span><span·class="w">·</span><span·class="nc">dot</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-2">{</span><span·class="ss">rule</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-3">[</span><span·class="ss">&#39;$1&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·80,·SHA:·178c6891d1da6722a781bed17a43d6f3ceb32a97a7612cf1dcb2566a80fbeb68·...·]-3">]</span><span·class="p">,</span><span·class="w">
347 ········</span><span·class="ss">&#39;$4&#39;</span><span·class="p"·data-group-id="9624424250-2">}</span><span·class="p">.</span><span·class="w">347 ········</span><span·class="ss">&#39;$4&#39;</span><span·class="p"·data-group-id="4149573604-2">}</span><span·class="p">.</span><span·class="w">
348 </span><span·class="ss">head</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">348 </span><span·class="ss">head</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
349 </span><span·class="ss">symbols</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-4">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-4">]</span><span·class="p">.</span><span·class="w">349 </span><span·class="ss">symbols</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-4">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-4">]</span><span·class="p">.</span><span·class="w">
350 </span><span·class="ss">symbols</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="ss">symbols</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-5">[</span><span·class="ss">&#39;$1&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="9624424250-5">]</span><span·class="p">.</span><span·class="w">350 </span><span·class="ss">symbols</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">symbol</span><span·class="w">·</span><span·class="ss">symbols</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-5">[</span><span·class="ss">&#39;$1&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="4149573604-5">]</span><span·class="p">.</span><span·class="w">
351 </span><span·class="ss">attached_code</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;:&#39;</span><span·class="w">·</span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-6">{</span><span·class="ss">erlang_code</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="9624424250-6">}</span><span·class="p">.</span><span·class="w">351 </span><span·class="ss">attached_code</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;:&#39;</span><span·class="w">·</span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-6">{</span><span·class="ss">erlang_code</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="4149573604-6">}</span><span·class="p">.</span><span·class="w">
352 </span><span·class="ss">attached_code</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;$empty&#39;</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-7">{</span><span·class="ss">erlang_code</span><span·class="p">,</span><span·class="w">352 </span><span·class="ss">attached_code</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;$empty&#39;</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-7">{</span><span·class="ss">erlang_code</span><span·class="p">,</span><span·class="w">
353 ·················</span><span·class="p"·data-group-id="9624424250-8">[</span><span·class="p"·data-group-id="9624424250-9">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$undefined[·...·truncated·by·diffoscope;·len:·159,·SHA:·725280ac4219b1037984c60f28ffa281676762f59aae501db4198e1b54393a66·...·]-7">}</span><span·class="p">.</span><span·class="w">353 ·················</span><span·class="p"·data-group-id="4149573604-8">[</span><span·class="p"·data-group-id="4149573604-9">{</span><span·class="ss">atom</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$undefined[·...·truncated·by·diffoscope;·len:·159,·SHA:·32bb91a334966d72770e37f2009b7a1ca4ac01e84629a58ad27acb3aa526c103·...·]-7">}</span><span·class="p">.</span><span·class="w">
354 </span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">token</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-10">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-10">]</span><span·class="p">.</span><span·class="w">354 </span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">token</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-10">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-10">]</span><span·class="p">.</span><span·class="w">
355 </span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">token</span><span·class="w">·</span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-11">[</span><span·class="ss">&#39;$1&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="9624424250-11">]</span><span·class="p">.</span><span·class="w">355 </span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">token</span><span·class="w">·</span><span·class="ss">tokens</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-11">[</span><span·class="ss">&#39;$1&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="4149573604-11">]</span><span·class="p">.</span><span·class="w">
356 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">var</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9624424250-12">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-12">)</span><span·class="p">.</span><span·class="w">356 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">var</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="4149573604-12">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-12">)</span><span·class="p">.</span><span·class="w">
357 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">atom</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9624424250-13">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-13">)</span><span·class="p">.</span><span·class="w">357 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">atom</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="4149573604-13">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-13">)</span><span·class="p">.</span><span·class="w">
358 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">integer</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9624424250-14">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-14">)</span><span·class="p">.</span><span·class="w">358 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">integer</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="4149573604-14">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-14">)</span><span·class="p">.</span><span·class="w">
359 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">reserved_word</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9624424250-15">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-15">)</span><span·class="p">.</span><span·class="w">359 </span><span·class="ss">symbol</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">reserved_word</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="4149573604-15">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-15">)</span><span·class="p">.</span><span·class="w">
360 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">var</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">360 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">var</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
361 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">atom</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">361 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">atom</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
362 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nb">float</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">362 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nb">float</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
363 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">integer</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">363 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">integer</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
364 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">string</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">364 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">string</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
365 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">char</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">365 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">char</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p">.</span><span·class="w">
366 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">reserved_symbol</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-16">{</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9624424250-17">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9624424250-17">)</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·207,·SHA:·4f50854f89d979e0f802df833bab888daa45eed1dd9a28a097b6818a91018bd4·...·]-16">}</span><span·class="p">.</span><span·class="w">366 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">reserved_symbol</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-16">{</span><span·class="nf">value_of</span><span·class="p"·data-group-id="4149573604-17">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="4149573604-17">)</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·207,·SHA:·3db9973755b41aeb489ac5b854f41963126f436bc0d2f048c0cb4fe3e3264b3d·...·]-16">}</span><span·class="p">.</span><span·class="w">
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368 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;-&gt;&#39;</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-22">{</span><span·class="ss">&#39;-&gt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">line_of</span><span·class="p"·data-group-id="9624424250-23">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·70,·SHA:·4f45967a529dff17ac0a2580618b407c4e749f46e8090541a3ed04350495bdf9·...·]-22">}</span><span·class="p">.</span><span·class="w">368 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;-&gt;&#39;</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-22">{</span><span·class="ss">&#39;-&gt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">line_of</span><span·class="p"·data-group-id="4149573604-23">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·70,·SHA:·d18dccaf8fa393f8a6da39065855fec9fdcf20d122231448aba49b19da314899·...·]-22">}</span><span·class="p">.</span><span·class="w">
369 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;:&#39;</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9624424250-24">{</span><span·class="ss">&#39;:&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">line_of</span><span·class="p"·data-group-id="9624424250-25">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·d2f7f7f328dd315536d8632cb44d4c33bca52e00b2dee1aa127fe771043bb709·...·]-24">}</span><span·class="p">.</span><span·class="w">369 </span><span·class="ss">token</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">&#39;:&#39;</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4149573604-24">{</span><span·class="ss">&#39;:&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">line_of</span><span·class="p"·data-group-id="4149573604-25">(</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·66,·SHA:·f42852c85baf52deaaa43660bb412ce86ccefa58683f23bbbf48948aae2b6e02·...·]-24">}</span><span·class="p">.</span><span·class="w">
370 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">code</span><span·class="p">.</span><span·class="w">370 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">code</span><span·class="p">.</span><span·class="w">
371 </span><span·class="nf">value_of</span><span·class="p"·data-group-id="9624424250-26">(</span><span·class="n">Token</span><span·class="p"·data-group-id="9624424250-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">371 </span><span·class="nf">value_of</span><span·class="p"·data-group-id="4149573604-26">(</span><span·class="n">Token</span><span·class="p"·data-group-id="4149573604-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
372 ····</span><span·class="nf">element</span><span·class="p"·data-group-id="9624424250-27">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Token</span><span·class="p"·data-group-id="9624424250-27">)</span><span·class="p">.</span><span·class="w">372 ····</span><span·class="nf">element</span><span·class="p"·data-group-id="4149573604-27">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Token</span><span·class="p"·data-group-id="4149573604-27">)</span><span·class="p">.</span><span·class="w">
373 </span><span·class="nf">line_of</span><span·class="p"·data-group-id="9624424250-28">(</span><span·class="n">Token</span><span·class="p"·data-group-id="9624424250-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">373 </span><span·class="nf">line_of</span><span·class="p"·data-group-id="4149573604-28">(</span><span·class="n">Token</span><span·class="p"·data-group-id="4149573604-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
374 ····</span><span·class="nf">element</span><span·class="p"·data-group-id="9624424250-29">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Token</span><span·class="p"·data-group-id="9624424250-29">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·symbols·<code·class="inline">'-&gt;'</code>,·and·<code·class="inline">':'</code>·have·to·be·treated·in·a·special·way,·as·they·are374 ····</span><span·class="nf">element</span><span·class="p"·data-group-id="4149573604-29">(</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Token</span><span·class="p"·data-group-id="4149573604-29">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·symbols·<code·class="inline">'-&gt;'</code>,·and·<code·class="inline">':'</code>·have·to·be·treated·in·a·special·way,·as·they·are
375 meta·symbols·of·the·grammar·notation,·as·well·as·terminal·symbols·of·the·Yecc375 meta·symbols·of·the·grammar·notation,·as·well·as·terminal·symbols·of·the·Yecc
376 grammar.</p></section><p>5.·The·file·<code·class="inline">erl_parse.yrl</code>·in·the·<code·class="inline">lib/stdlib/src</code>·directory·contains·the376 grammar.</p></section><p>5.·The·file·<code·class="inline">erl_parse.yrl</code>·in·the·<code·class="inline">lib/stdlib/src</code>·directory·contains·the
377 grammar·for·Erlang.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Syntactic·tests·are·used·in·the·code·associated·with·some·rules,·and·an·error377 grammar·for·Erlang.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Syntactic·tests·are·used·in·the·code·associated·with·some·rules,·and·an·error
378 is·thrown·(and·caught·by·the·generated·parser·to·produce·an·error·message)378 is·thrown·(and·caught·by·the·generated·parser·to·produce·an·error·message)
379 when·a·test·fails.·The·same·effect·can·be·achieved·with·a·call·to379 when·a·test·fails.·The·same·effect·can·be·achieved·with·a·call·to
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144 ········Built·using144 ········Built·using
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147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
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182 ········Built·using182 ········Built·using
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185 ······</p>185 ······</p>
186 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>186 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
190 </div>190 </div>
191 <script>191 <script>
192 ··function·mermaidLoaded()·{192 ··function·mermaidLoaded()·{
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1486 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1486 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1487 ····</footer>1487 ····</footer>
1488 ··</div>1488 ··</div>
1489 </main>1489 </main>
1490 </div>1490 </div>
1491 <script>1491 <script>
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3187 certificates·include·policies·the·constrained·policy·set·with3187 certificates·include·policies·the·constrained·policy·set·with
3188 potential·qualifiers·will·be·returned,·these·values·are·derived·from3188 potential·qualifiers·will·be·returned,·these·values·are·derived·from
3189 the·policy·tree·created·as·part·of·the·path·validation·algorithm.·The3189 the·policy·tree·created·as·part·of·the·path·validation·algorithm.·The
3190 constrained·set·can·be·constrained·only·by·the·Certificate·Authorities3190 constrained·set·can·be·constrained·only·by·the·Certificate·Authorities
3191 or·also·by·the·user·when·the·option·<code·class="inline">policy_set</code>·is·provided·to·this3191 or·also·by·the·user·when·the·option·<code·class="inline">policy_set</code>·is·provided·to·this
3192 function.·The·qualifiers·convey·information·about·the·valid·policy·and3192 function.·The·qualifiers·convey·information·about·the·valid·policy·and
3193 is·intended·as·information·to·end·users.</p><p>Available·options:</p><ul><li><p><strong>{verify_fun,·{fun(),·UserState::term()}</strong>·-·The·fun·must·be3193 is·intended·as·information·to·end·users.</p><p>Available·options:</p><ul><li><p><strong>{verify_fun,·{fun(),·UserState::term()}</strong>·-·The·fun·must·be
3194 defined·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="8993796577-1">(</span><span·class="n">OtpCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="89937[·...·truncated·by·diffoscope;·len:·58,·SHA:·02b2d9e20c254f96ec9a5d04a88ac63360594078d9719424b00a4ce231f25918·...·]-2">}</span><span·class="p">,</span><span·class="w">3194 defined·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="6886516904-1">(</span><span·class="n">OtpCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="68865[·...·truncated·by·diffoscope;·len:·58,·SHA:·8d30a1d34413f792c84c01f30f1eb0c574d4ed0e1ef25d9c369784d8c1437ee9·...·]-2">}</span><span·class="p">,</span><span·class="w">
3195 ····</span><span·class="n">Event</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8993796577-3">{</span><span·class="ss">bad_cert</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">bad_cert_rea[·...·truncated·by·diffoscope;·len:·548,·SHA:·df5ee5bf8501cfb1c72949fa14104b2662ff746dd497db3f6d9d9b680d79f73b·...·]-3">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3195 ····</span><span·class="n">Event</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="6886516904-3">{</span><span·class="ss">bad_cert</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">bad_cert_rea[·...·truncated·by·diffoscope;·len:·548,·SHA:·679058314b5d5dd9f0d46c6716a96078386beec899327cbc55ae5339be9f157a·...·]-3">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3196 ·············</span><span·class="p"·data-group-id="8993796577-7">{</span><span·class="ss">extension</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="8993796577-8">{</span><span·class="p"·data-group-id="89[·...·truncated·by·diffoscope;·len:·61,·SHA:·42cb8dec1105c5104e4e56e8e00022c5bb0ddfbc2c461eb9bacc4626ca0ffff4·...·]-7">}</span><span·class="p">,</span><span·class="w">3196 ·············</span><span·class="p"·data-group-id="6886516904-7">{</span><span·class="ss">extension</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="6886516904-8">{</span><span·class="p"·data-group-id="68[·...·truncated·by·diffoscope;·len:·61,·SHA:·fa19e65bfda3231f420713702ff37f5e30aa2e5fc25a2c248ba5682aded9a0f4·...·]-7">}</span><span·class="p">,</span><span·class="w">
3197 ····</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="8993796577-9">(</span><span·class="p"·data-group-id="8993796577-9">)</span><span·class="p"·data-group-id="8993796577-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">3197 ····</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="6886516904-9">(</span><span·class="p"·data-group-id="6886516904-9">)</span><span·class="p"·data-group-id="6886516904-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
3198 ··</span><span·class="p"·data-group-id="8993796577-10">{</span><span·class="ss">valid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span>[·...·truncated·by·diffoscope;·len:·149,·SHA:·e4de07834e7e6e3355ee7cbcf781256b5a8d505c4828404fead079e2b020d27e·...·]-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3198 ··</span><span·class="p"·data-group-id="6886516904-10">{</span><span·class="ss">valid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span>[·...·truncated·by·diffoscope;·len:·149,·SHA:·58df936795d5d22504e1d3b3e3f0432238a1fe6f12a90ef800ca508d875b3c71·...·]-10">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3199 ··</span><span·class="p"·data-group-id="8993796577-12">{</span><span·class="ss">valid_peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</[·...·truncated·by·diffoscope;·len:·154,·SHA:·b55a509303811496ee6508d93f507cd706c3ea3fbbe43a15fdd9775536172b2e·...·]-12">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3199 ··</span><span·class="p"·data-group-id="6886516904-12">{</span><span·class="ss">valid_peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</[·...·truncated·by·diffoscope;·len:·154,·SHA:·4fe1f5416760ac0f45fcdfb1dac38ecaefc7d35f19b7384b2d593c17753ffd46·...·]-12">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3200 ··</span><span·class="p"·data-group-id="8993796577-14">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><spa[·...·truncated·by·diffoscope;·len:·145,·SHA:·dfba9ef91c5e887da6adff2fccfa7e3d2a114170c9682be204e5184705506a00·...·]-14">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3200 ··</span><span·class="p"·data-group-id="6886516904-14">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><spa[·...·truncated·by·diffoscope;·len:·145,·SHA:·d84dcb5f9777270377977b0fbd2d831ceb8e3fa27ed7649d96f8abf91d0b687e·...·]-14">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3201 ··</span><span·class="p"·data-group-id="8993796577-16">{</span><span·class="ss">unknown</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</spa[·...·truncated·by·diffoscope;·len:·634,·SHA:·1e48f1da2e6ce021aa6ad2dd38001bfe6fa162cacf783d875e7df078e6cb2136·...·]-2">}</span><span·class="p">,</span><span·class="w">3201 ··</span><span·class="p"·data-group-id="6886516904-16">{</span><span·class="ss">unknown</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</spa[·...·truncated·by·diffoscope;·len:·634,·SHA:·19a6712bb1ca6fba783f84de7d095f98a65c03b032158380bee506335e430376·...·]-2">}</span><span·class="p">,</span><span·class="w">
3202 ····</span><span·class="n">DerCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">der_encoded</span><span·class="p"·data-group-id="9320132935-3">(</span><span·class="p"·data-group-id="9320132935-3">)</span><span·class="p">,</span><span·class="w">3202 ····</span><span·class="n">DerCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">der_encoded</span><span·class="p"·data-group-id="4498195536-3">(</span><span·class="p"·data-group-id="4498195536-3">)</span><span·class="p">,</span><span·class="w">
3203 ····</span><span·class="n">Event</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9320132935-4">{</span><span·class="ss">bad_cert</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">bad_cert_rea[·...·truncated·by·diffoscope;·len:·548,·SHA:·aa7eacc098eace155aa83962a5d0b7f96dde2904966ec342170cdca286d1aa49·...·]-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3203 ····</span><span·class="n">Event</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4498195536-4">{</span><span·class="ss">bad_cert</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">bad_cert_rea[·...·truncated·by·diffoscope;·len:·548,·SHA:·e5581200012170b9f3b3ba651cd4510ce3976c95407cb78aa048caa6df4463d7·...·]-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3204 ·············</span><span·class="p"·data-group-id="9320132935-8">{</span><span·class="ss">extension</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="9320132935-9">{</span><span·class="p"·data-group-id="93[·...·truncated·by·diffoscope;·len:·61,·SHA:·ff7c6674577d94d3e05759005879ba0f7478c46db648b098eee965b9e65cf1a0·...·]-8">}</span><span·class="p">,</span><span·class="w">3204 ·············</span><span·class="p"·data-group-id="4498195536-8">{</span><span·class="ss">extension</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="4498195536-9">{</span><span·class="p"·data-group-id="44[·...·truncated·by·diffoscope;·len:·61,·SHA:·3db33f4dbab54f8b5becf9dc44013f728b5a683a588ba63d68d5f3c20dda8a5e·...·]-8">}</span><span·class="p">,</span><span·class="w">
3205 ····</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="9320132935-10">(</span><span·class="p"·data-group-id="9320132935-10">)</span><span·class="p"·data-group-id="9320132935-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">3205 ····</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4498195536-10">(</span><span·class="p"·data-group-id="4498195536-10">)</span><span·class="p"·data-group-id="4498195536-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
3206 ··</span><span·class="p"·data-group-id="9320132935-11">{</span><span·class="ss">valid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span>[·...·truncated·by·diffoscope;·len:·149,·SHA:·09aeb0d9a0ad04d9b9e7ae0c6132a151cc5eb5e71b30d8b818f6a96bb447e2b3·...·]-11">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3206 ··</span><span·class="p"·data-group-id="4498195536-11">{</span><span·class="ss">valid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span>[·...·truncated·by·diffoscope;·len:·149,·SHA:·4c9ed2e99fcc6b8191b106648c28fb9481371c4aaf0f9c321fb154429269f9e7·...·]-11">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3207 ··</span><span·class="p"·data-group-id="9320132935-13">{</span><span·class="ss">valid_peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</[·...·truncated·by·diffoscope;·len:·154,·SHA:·18c264b9b35c12fd34d474c2db27812c0b3fd0ffcfc0a8d25a4f7d05a72c9b61·...·]-13">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3207 ··</span><span·class="p"·data-group-id="4498195536-13">{</span><span·class="ss">valid_peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</[·...·truncated·by·diffoscope;·len:·154,·SHA:·5490fb7cb0b6d91052dea342d4ebf555be96d1af588e62c5a24c72ef3ec2664b·...·]-13">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3208 ··</span><span·class="p"·data-group-id="9320132935-15">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><spa[·...·truncated·by·diffoscope;·len:·145,·SHA:·5f25eec9eafb3fa07d86e63c122176eeb58ed652f4250579c0c82262164aa29d·...·]-15">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3208 ··</span><span·class="p"·data-group-id="4498195536-15">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><spa[·...·truncated·by·diffoscope;·len:·145,·SHA:·d09e965fe56da31ef06922171dc6f370619c407fd083337c0601f357ca6d035d·...·]-15">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3209 ··</span><span·class="p"·data-group-id="9320132935-17">{</span><span·class="ss">unknown</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</spa[·...·truncated·by·diffoscope;·len:·151,·SHA:·fe1134e20e1eee4bd63cd33f1ccd60b37e4567c07f24e480421091c75b4c06a0·...·]-17">}</span><span·class="p">.</span></code></pre><p>The·verify·callback·can·have·3·or·4·arguments·in·case·the·DER·encoded3209 ··</span><span·class="p"·data-group-id="4498195536-17">{</span><span·class="ss">unknown</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</spa[·...·truncated·by·diffoscope;·len:·151,·SHA:·901d0e77b2cd320f11d65acd485f9e17173e86237d1569b38a83df16bd960e55·...·]-17">}</span><span·class="p">.</span></code></pre><p>The·verify·callback·can·have·3·or·4·arguments·in·case·the·DER·encoded
3210 version·is·needed·by·the·callback.</p><p>If·the·verify·callback·fun·returns·<code·class="inline">{fail,·Reason}</code>,·the·verification·process3210 version·is·needed·by·the·callback.</p><p>If·the·verify·callback·fun·returns·<code·class="inline">{fail,·Reason}</code>,·the·verification·process
3211 is·immediately·stopped.·If·the·verify·callback·fun·returns3211 is·immediately·stopped.·If·the·verify·callback·fun·returns
3212 <code·class="inline">{valid,·UserState}</code>,·the·verification·process·is·continued.·This·can·be·used3212 <code·class="inline">{valid,·UserState}</code>,·the·verification·process·is·continued.·This·can·be·used
3213 to·accept·specific·path·validation·errors,·such·as·<code·class="inline">selfsigned_peer</code>,·as·well3213 to·accept·specific·path·validation·errors,·such·as·<code·class="inline">selfsigned_peer</code>,·as·well
3214 as·verifying·application-specific·extensions.·If·called·with·an·extension3214 as·verifying·application-specific·extensions.·If·called·with·an·extension
3215 unknown·to·the·user·application,·the·return·value·<code·class="inline">{unknown,·UserState}</code>·is·to3215 unknown·to·the·user·application,·the·return·value·<code·class="inline">{unknown,·UserState}</code>·is·to
3216 be·used.</p><blockquote><h4·class="note">Note</h4><p>If·you·need·the·DER·encoded·version·of·the·certificate·and·have3216 be·used.</p><blockquote><h4·class="note">Note</h4><p>If·you·need·the·DER·encoded·version·of·the·certificate·and·have
Offset 3366, 17 lines modifiedOffset 3366, 17 lines modified
3366 certificate·is·in·agreement·with·at·least·one·of·the·<em>Reference·Identifier</em>·that3366 certificate·is·in·agreement·with·at·least·one·of·the·<em>Reference·Identifier</em>·that
3367 the·client·expects·to·be·connected·to.</p><p>The·function·is·intended·to·be·added·as·an·extra·client·check·of·the3367 the·client·expects·to·be·connected·to.</p><p>The·function·is·intended·to·be·added·as·an·extra·client·check·of·the
3368 peer·certificate·when·performing3368 peer·certificate·when·performing
3369 <a·href="#pkix_path_validation/3">public_key:pkix_path_validation/3</a></p><p>See·<a·href="https://tools.ietf.org/html/rfc6125">RFC·6125</a>·for·detailed·information3369 <a·href="#pkix_path_validation/3">public_key:pkix_path_validation/3</a></p><p>See·<a·href="https://tools.ietf.org/html/rfc6125">RFC·6125</a>·for·detailed·information
3370 about·hostname·verification.·The3370 about·hostname·verification.·The
3371 <a·href="using_public_key.html#verify_hostname">User's·Guide</a>·and3371 <a·href="using_public_key.html#verify_hostname">User's·Guide</a>·and
3372 <a·href="using_public_key.html#verify_hostname_examples">code·examples</a>·describes·this3372 <a·href="using_public_key.html#verify_hostname_examples">code·examples</a>·describes·this
3373 function·more·detailed.</p><p>The·option·funs·are·described·here:</p><ul><li><p><strong><code·class="inline">match_fun</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0317488346-1">(</span><span·class="n">ReferenceId</span><span·class="p">:</span><span·class="p">:</span><span·class="n">ReferenceId</span><span·class="p"·data-group-id="0317488346-2">(</span><span·class="p"·data-group-id="0317488346-2">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">FQDN</span><span·class="p">:</span><span·class="p">:</span><span·class="nf">string</span><span·class="p"·data-group-id="0317488346-3">(</span><span·class="p"·data-group-id="0317488346-3">)</span><span·class="p">,</span><span·class="w"> 
3374 ····</span><span·class="n">PresentedId</span><span·class="p">:</span><span·class="p">:</span><span·class="p"·data-group-id="0317488346-4">{</span><span·class="ss">dNSName</span><span·class="p">,</span><span·class="nf">string</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·509,·SHA:·4e321094e85ea549c625e6abd25421d80ca95e4a68e54c9bb48583e951e42467·...·]</span><span·class="w">3373 function·more·detailed.</p><p>The·option·funs·are·described·here:</p><ul><li><p><strong><code·class="inline">match_fun</code></strong></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="9757689582-1[·...·truncated·by·diffoscope;·len:·532,·SHA:·6e19b679ce3b5d8a306b555bc0f0a0747c95d76d7b2df958498f904377cbb424·...·]</span><span·class="w">
 3374 ····</span><span·class="n">PresentedId</span><span·class="p">:</span><span·class="p">:</span><span·class="p"·data-group-id="9757689582-4">{</span><span·class="ss">dNSName</span><span·class="p">,</span><span·class="nf">string</span><span·class="p"·data-group-id="9757689582-5">(</span><span·class="p"·data-group-id="9757689582-5">)</span><span·class="p"·data-group-id="9757689582-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="9757689582-6">{</span><span·class="ss">uniformResourceIdentifier</span><span·class="p">,</span><span·class="nf">string</span><span·class="p"·data-group-id="9757689582-7">(</span><span·class="p"·data-group-id="9757689582-7">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3375 ·················</span><span·class="p"·data-group-id="0317488346-8">{</span><span·class="ss">iPAddress</span><span·class="p">,</span><span·class="nf">list</span><span·class="p"·data-group-id="0317488346-9">(</span><span·class="nf">byte</span><span·class="p"·data-group-id="0317488346-10">(</span><span·class="p[·...·truncated·by·diffoscope;·len:·953,·SHA:·e76966e5c479607d0e038ed1ffcc953aa865e671b2f6462c0d7efd2aff2ea0c5·...·]-1">)</span></code></pre><p>This·function·replaces·the·default·host·name·matching·rules.·The·fun·should3375 ·················</span><span·class="p"·data-group-id="9757689582-8">{</span><span·class="ss">iPAddress</span><span·class="p">,</span><span·class="nf">list</span><span·class="p"·data-group-id="9757689582-9">(</span><span·class="nf">byte</span><span·class="p"·data-group-id="9757689582-10">(</span><span·class="p[·...·truncated·by·diffoscope;·len:·953,·SHA:·e012e5369122f83c91f3e1c8a4f93b94cda5c0e2b143691689275606a883561e·...·]-1">)</span></code></pre><p>This·function·replaces·the·default·host·name·matching·rules.·The·fun·should
3376 return·a·boolean·to·tell·if·the·Reference·ID·and·Presented·ID·matches·or·not.3376 return·a·boolean·to·tell·if·the·Reference·ID·and·Presented·ID·matches·or·not.
3377 The·match·fun·can·also·return·a·third·value,·value,·the·atom·<code·class="inline">default</code>,·if·the3377 The·match·fun·can·also·return·a·third·value,·value,·the·atom·<code·class="inline">default</code>,·if·the
3378 default·matching·rules·shall·apply.·This·makes·it·possible·to·augment·the3378 default·matching·rules·shall·apply.·This·makes·it·possible·to·augment·the
3379 tests·with·a·special·case:</p><pre><code·class="text">fun(....)·-&gt;·true;···%·My·special·case3379 tests·with·a·special·case:</p><pre><code·class="text">fun(....)·-&gt;·true;···%·My·special·case
3380 ···(_,·_)·-&gt;·default·%·all·others·falls·back·to·the·inherit·tests3380 ···(_,·_)·-&gt;·default·%·all·others·falls·back·to·the·inherit·tests
3381 end</code></pre><p>See·<a·href="#pkix_verify_hostname_match_fun/1"><code·class="inline">pkix_verify_hostname_match_fun/1</code></a>·for·a·function·that·takes·a·protocol3381 end</code></pre><p>See·<a·href="#pkix_verify_hostname_match_fun/1"><code·class="inline">pkix_verify_hostname_match_fun/1</code></a>·for·a·function·that·takes·a·protocol
3382 name·as·argument·and·returns·a·<code·class="inline">fun/2</code>·suitable·for·this·option·and3382 name·as·argument·and·returns·a·<code·class="inline">fun/2</code>·suitable·for·this·option·and
Offset 3560, 22 lines modifiedOffset 3560, 22 lines modified
3560 ····································revocation_status_undetermined·|3560 ····································revocation_status_undetermined·|
3561 ····································{revocation_status_undetermined,·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()}·|3561 ····································{revocation_status_undetermined,·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()}·|
3562 ····································{revoked,·<a·href="#t:crl_reason/0">crl_reason</a>()}.</pre>3562 ····································{revoked,·<a·href="#t:crl_reason/0">crl_reason</a>()}.</pre>
  
3563 ······</div>3563 ······</div>
  
3564 <p>Performs·CRL·validation.·It·is·intended·to·be·called·from·the·verify·fun·of3564 <p>Performs·CRL·validation.·It·is·intended·to·be·called·from·the·verify·fun·of
3565 <a·href="#pkix_path_validation/3">pkix_path_validation/3·</a>.</p><p>Available·options:</p><ul><li><p><strong>{update_crl,·fun()}</strong>·-·The·fun·has·the·following·type·specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="5783582764-1">(</span><span·class="o">#</span><span·class="ss">&#39;DistributionPoint&#39;</span><span·class="p"·data-group-id="5783582764-2">{</span><span·class="p"·data-group-id="5783582764-2">}</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·215,·SHA:·4bdda6e3741c0cd93502eb27562fa2c9d23c8d49cb98b0c2aadbfb07a8bcbce5·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">3565 <a·href="#pkix_path_validation/3">pkix_path_validation/3·</a>.</p><p>Available·options:</p><ul><li><p><strong>{update_crl,·fun()}</strong>·-·The·fun·has·the·following·type·specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7450710577-1">(</span><span·class="o">#</span><span·class="ss">&#39;DistributionPoint&#39;</span><span·class="p"·data-group-id="7450710577-2">{</span><span·class="p"·data-group-id="7450710577-2">}</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·215,·SHA:·3cd6244e598843288b25c95c29e2af5c147f74ed244e574ec20db3da3075a7bc·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
3566 ········</span><span·class="o">#</span><span·class="ss">&#39;CertificateList&#39;</span><span·class="p"·data-group-id="5783582764-4">{</span><span·class="p"·data-group-id="5783582764-4">}</span></code></pre><p>The·fun·uses·the·information·in·the·distribution·point·to·access·the·latest3566 ········</span><span·class="o">#</span><span·class="ss">&#39;CertificateList&#39;</span><span·class="p"·data-group-id="7450710577-4">{</span><span·class="p"·data-group-id="7450710577-4">}</span></code></pre><p>The·fun·uses·the·information·in·the·distribution·point·to·access·the·latest
3567 possible·version·of·the·CRL.·If·this·fun·is·not·specified,·Public·Key·uses·the3567 possible·version·of·the·CRL.·If·this·fun·is·not·specified,·Public·Key·uses·the
3568 default·implementation:</p><pre><code·class="text">·fun(_DP,·CRL)·-&gt;·CRL·end</code></pre></li><li><p><strong>{issuer_fun,·{fun(),·UserState::term()}}</strong>·-·The·fun·has·the·following·type3568 default·implementation:</p><pre><code·class="text">·fun(_DP,·CRL)·-&gt;·CRL·end</code></pre></li><li><p><strong>{issuer_fun,·{fun(),·UserState::term()}}</strong>·-·The·fun·has·the·following·type
3569 specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="5475078442-1">(</span><span·class="o">#</span><span·class="ss">&#39;DistributionPoint&#39;</span><span·class="p"·data-group-id="5475078442-2">{</span><span·class="p"·data-group-id="5475078442-2">}</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·162,·SHA:·fd51c4c06bba4bde790d345efdaa2c4ebf5e880c1f807ac2adbac95a9401ac2f·...·]-3">}</span><span·class="p">,</span><span·class="w">3569 specification:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="6022380989-1">(</span><span·class="o">#</span><span·class="ss">&#39;DistributionPoint&#39;</span><span·class="p"·data-group-id="6022380989-2">{</span><span·class="p"·data-group-id="6022380989-2">}</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·162,·SHA:·f82e42317193987d3214fabae9ed1d71384591475fb3af3d3f3cc03302591f70·...·]-3">}</span><span·class="p">,</span><span·class="w">
3570 ····</span><span·class="p"·data-group-id="5475078442-4">{</span><span·class="ss">rdnSequence</span><span·class="p">,</span><span·class="p"·data-group-id="5475078442-5">[</span><span·class="o">#</span><span·class="ss">&#39;AttributeTypeAndValue&#39;</span><span·class="p"·data-group-id="5475078442-6[·...·truncated·by·diffoscope;·len:·472,·SHA:·0d674fa12a015963aa67171c48b14eff94ff0cfba67af47ac9b6844fd5e85f92·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">3570 ····</span><span·class="p"·data-group-id="6022380989-4">{</span><span·class="ss">rdnSequence</span><span·class="p">,</span><span·class="p"·data-group-id="6022380989-5">[</span><span·class="o">#</span><span·class="ss">&#39;AttributeTypeAndValue&#39;</span><span·class="p"·data-group-id="6022380989-6[·...·truncated·by·diffoscope;·len:·472,·SHA:·d1aba2dc1df9f7fc36896cf05577b9ef390a89a6e9b1c90ed0763c73a7febe9b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
3571 ··</span><span·class="p"·data-group-id="5475078442-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="5475078442-9">{</span><span·class="p"·data-group-id="5475[·...·truncated·by·diffoscope;·len:·250,·SHA:·53226e413cb1359c944fbf7b05dedae9c6c523f5ae660b242ab72665245928bb·...·]-8">}</span></code></pre><p>The·fun·returns·the·root·certificate·and·certificate·chain·that·has·signed·the3571 ··</span><span·class="p"·data-group-id="6022380989-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="6022380989-9">{</span><span·class="p"·data-group-id="6022[·...·truncated·by·diffoscope;·len:·250,·SHA:·3b7bdbf7146049a7260e9326ae3ac5cefdbd7bf834831b4ec83fa18cf604f292·...·]-8">}</span></code></pre><p>The·fun·returns·the·root·certificate·and·certificate·chain·that·has·signed·the
3572 CRL.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8442288579-1">(</span><span·class="n">DP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CRL</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Issuer</span><span·class="p">,</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·430,·SHA:·f0109242f6519e7dc823d941f7d026b5df64ddac5fa5601f91a551cc204b1034·...·]-2">}</span></code></pre></li><li><p><strong>{undetermined_details,·boolean()}</strong>·-·Defaults·to·false.·When·revocation3572 CRL.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="9676711472-1">(</span><span·class="n">DP</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CRL</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Issuer</span><span·class="p">,</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·430,·SHA:·d70468a7a1115c6f0c2bded3024be3f873a1f6691904dea4b2ce417e2e6959de·...·]-2">}</span></code></pre></li><li><p><strong>{undetermined_details,·boolean()}</strong>·-·Defaults·to·false.·When·revocation
3573 status·cannot·be·determined,·and·this·option·is·set·to·true,·details·of·why·no3573 status·cannot·be·determined,·and·this·option·is·set·to·true,·details·of·why·no
3574 CRLs·where·accepted·are·included·in·the·return·value.</p></li></ul>3574 CRLs·where·accepted·are·included·in·the·return·value.</p></li></ul>
3575 ··</section>3575 ··</section>
3576 </section>3576 </section>
3577 <section·class="detail"·id="pkix_dist_point/1">3577 <section·class="detail"·id="pkix_dist_point/1">
  
3578 ··<div·class="detail-header">3578 ··<div·class="detail-header">
Offset 3899, 26 lines modifiedOffset 3899, 26 lines modified
3899 certificate,·but·makes·the·certificate·useful·for·both·roles.</p><p>Explanation·of·the·options·used·to·customize·certificates·in·the·generated3899 certificate,·but·makes·the·certificate·useful·for·both·roles.</p><p>Explanation·of·the·options·used·to·customize·certificates·in·the·generated
3900 chains:</p><ul><li><p><strong>{digest,·digest_type()}</strong>·-·Hash·algorithm·to·be·used·for·signing·the3900 chains:</p><ul><li><p><strong>{digest,·digest_type()}</strong>·-·Hash·algorithm·to·be·used·for·signing·the
3901 certificate·together·with·the·key·option.·Defaults·to·sha·that·is·sha1.</p></li><li><p><strong>{key,··ec_params()|·{rsa,·Size:pos_integer(),·Prime::pos_integer()}·|·private_key()}</strong>·-·Parameters·to·be·used·to·call3901 certificate·together·with·the·key·option.·Defaults·to·sha·that·is·sha1.</p></li><li><p><strong>{key,··ec_params()|·{rsa,·Size:pos_integer(),·Prime::pos_integer()}·|·private_key()}</strong>·-·Parameters·to·be·used·to·call
3902 public_key:generate_key/1,·to·generate·a·key,·or·an·existing·key.·Defaults·to3902 public_key:generate_key/1,·to·generate·a·key,·or·an·existing·key.·Defaults·to
3903 generating·an·ECDSA·key.·Note·this·could·fail·if·Erlang/OTP·is·compiled·with·a3903 generating·an·ECDSA·key.·Note·this·could·fail·if·Erlang/OTP·is·compiled·with·a
3904 very·old·cryptolib.</p></li><li><p><strong>{validity,·{From::erlang:timestamp(),·To::erlang:timestamp()}}</strong>·-·The3904 very·old·cryptolib.</p></li><li><p><strong>{validity,·{From::erlang:timestamp(),·To::erlang:timestamp()}}</strong>·-·The
3905 validity·period·of·the·certificate.</p></li><li><p><strong>{extensions,·[#'Extension'{}]}</strong>·-·Extensions·to·include·in·the3905 validity·period·of·the·certificate.</p></li><li><p><strong>{extensions,·[#'Extension'{}]}</strong>·-·Extensions·to·include·in·the
3906 certificate.</p><p>Default·extensions·included·in·CA·certificates·if·not·otherwise·specified·are:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6135742465-1">[</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="6135742465-2">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-keyUsage&#39;</span><span·class="p">,</span><span·class="w">3906 certificate.</p><p>Default·extensions·included·in·CA·certificates·if·not·otherwise·specified·are:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6842225262-1">[</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="6842225262-2">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-keyUsage&#39;</span><span·class="p">,</span><span·class="w">
3907 ··············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6135742465-3">[</span><span·class="ss">keyCertSign</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cRLSign</span><span·class="p"·data-group-id="6135742465-3">]</span><span·class="p">,</span><span·class="w">3907 ··············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6842225262-3">[</span><span·class="ss">keyCertSign</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">cRLSign</span><span·class="p"·data-group-id="6842225262-3">]</span><span·class="p">,</span><span·class="w">
3908 ··············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6135742465-2">}</span><span·class="p">,</span><span·class="w">3908 ··············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6842225262-2">}</span><span·class="p">,</span><span·class="w">
3909 </span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="6135742465-4">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-basicConstraints&#39;</span><span·class="p">,</span><span·class="w">3909 </span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="6842225262-4">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-basicConstraints&#39;</span><span·class="p">,</span><span·class="w">
3910 ·············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;BasicConstraints&#39;</span><span·class="p"·data-group-id="6135742465-5">{</span><span·class="ss">cA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6135742465-5">}</span><span·class="p">,</span><span·class="w">3910 ·············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;BasicConstraints&#39;</span><span·class="p"·data-group-id="6842225262-5">{</span><span·class="ss">cA</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6842225262-5">}</span><span·class="p">,</span><span·class="w">
3911 ·············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6135742465-4">}</span><span·class="p"·data-group-id="6135742465-1">]</span></code></pre><p>Default·extensions·included·in·the·server·peer·cert·if·not·otherwise·specified3911 ·············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6842225262-4">}</span><span·class="p"·data-group-id="6842225262-1">]</span></code></pre><p>Default·extensions·included·in·the·server·peer·cert·if·not·otherwise·specified
3912 are:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1657901965-1">[</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="1657901965-2">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-keyUsage&#39;</span><span·class="p">,</span><span·class="w">3912 are:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1336961711-1">[</span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="1336961711-2">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-keyUsage&#39;</span><span·class="p">,</span><span·class="w">
3913 ··············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1657901965-3">[</span><span·class="ss">digitalSignature</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">keyAgreement</span><span·class="p"·data-group-id="1657901965-3">]</span><span·class="p">,</span><span·class="w">3913 ··············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1336961711-3">[</span><span·class="ss">digitalSignature</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">keyAgreement</span><span·class="p"·data-group-id="1336961711-3">]</span><span·class="p">,</span><span·class="w">
3914 ··············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="1657901965-2">}</span><span·class="p">,</span><span·class="w">3914 ··············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="1336961711-2">}</span><span·class="p">,</span><span·class="w">
3915 </span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="1657901965-4">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-subjectAltName&#39;</span><span·class="p">,</span><span·class="w">3915 </span><span·class="o">#</span><span·class="ss">&#39;Extension&#39;</span><span·class="p"·data-group-id="1336961711-4">{</span><span·class="ss">extnID</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">&#39;id-ce-subjectAltName&#39;</span><span·class="p">,</span><span·class="w">
3916 ·············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1657901965-5">[</span><span·class="p"·data-group-id="1657901965-6">{</span><span·class="ss">dNSName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Hostname</span><span·class="p"·data-group-id="1657901965-6">}</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·6c612277d8c391be7bd17ed1a47b78558021aeb0debdeb936c88613b6f4e6b3e·...·]-5">]</span><span·class="p">,</span><span·class="w">3916 ·············</span><span·class="ss">extnValue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1336961711-5">[</span><span·class="p"·data-group-id="1336961711-6">{</span><span·class="ss">dNSName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Hostname</span><span·class="p"·data-group-id="1336961711-6">}</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·adcb1f9a0fa695d420220d1298895986a744acb709fcb68aa86052ff1a1f28fe·...·]-5">]</span><span·class="p">,</span><span·class="w">
3917 ·············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="1657901965-4">}</span><span·class="p"·data-group-id="1657901965-1">]</span></code></pre><p>Hostname·is·the·result·of·calling·net_adm:localhost()·in·the·Erlang·node·where3917 ·············</span><span·class="ss">critical</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="1336961711-4">}</span><span·class="p"·data-group-id="1336961711-1">]</span></code></pre><p>Hostname·is·the·result·of·calling·net_adm:localhost()·in·the·Erlang·node·where
3918 this·function·is·called.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Note·that·the·generated·certificates·and·keys·does·not·provide·a·formally3918 this·function·is·called.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Note·that·the·generated·certificates·and·keys·does·not·provide·a·formally
3919 correct·PKIX-trust-chain·and·they·cannot·be·used·to·achieve·real·security.3919 correct·PKIX-trust-chain·and·they·cannot·be·used·to·achieve·real·security.
3920 This·function·is·provided·for·testing·purposes·only.</p></section>3920 This·function·is·provided·for·testing·purposes·only.</p></section>
3921 ··</section>3921 ··</section>
3922 </section>3922 </section>
3923 <section·class="detail"·id="pkix_test_root_cert/2">3923 <section·class="detail"·id="pkix_test_root_cert/2">
  
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4244 ······<p·class="built-using">4244 ······<p·class="built-using">
4245 ········Built·using4245 ········Built·using
4246 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the4246 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
4247 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>4247 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
4248 ······</p>4248 ······</p>
4249 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>4249 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
4250 ····</footer>4250 ····</footer>
4251 ··</div>4251 ··</div>
4252 </main>4252 </main>
4253 </div>4253 </div>
4254 <script>4254 <script>
4255 ··function·mermaidLoaded()·{4255 ··function·mermaidLoaded()·{
4256 ····mermaid.initialize({4256 ····mermaid.initialize({
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222 ········Built·using222 ········Built·using
223 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the223 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
224 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>224 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
225 ······</p>225 ······</p>
226 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>226 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
227 ····</footer>227 ····</footer>
228 ··</div>228 ··</div>
229 </main>229 </main>
230 </div>230 </div>
231 <script>231 <script>
232 ··function·mermaidLoaded()·{232 ··function·mermaidLoaded()·{
233 ····mermaid.initialize({233 ····mermaid.initialize({
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125 ····<span>Public-Key·Records</span>125 ····<span>Public-Key·Records</span>
126 ··</h1>126 ··</h1>
  
127 <p>This·chapter·briefly·describes·Erlang·records·derived·from·ASN.1·specifications127 <p>This·chapter·briefly·describes·Erlang·records·derived·from·ASN.1·specifications
128 used·to·handle·public·key·infrastructure.·The·scope·is·to·describe·the·data128 used·to·handle·public·key·infrastructure.·The·scope·is·to·describe·the·data
129 types·of·each·component,·not·the·semantics.·For·information·on·the·semantics,129 types·of·each·component,·not·the·semantics.·For·information·on·the·semantics,
130 refer·to·the·relevant·standards·and·RFCs·linked·in·the·sections·below.</p><p>Use·the·following·include·directive·to·get·access·to·the·records·and·constant130 refer·to·the·relevant·standards·and·RFCs·linked·in·the·sections·below.</p><p>Use·the·following·include·directive·to·get·access·to·the·records·and·constant
131 macros·described·in·the·following·sections:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="0573002550-1">(</span><span·class="s">&quot;public_key/include/public_key.hrl&quot;</span><span·class="p"·data-group-id="0573002550-1">)</span><span·class="p">.</span></code></pre><h2·id="data-types"·class="section-heading">131 macros·described·in·the·following·sections:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="4951542751-1">(</span><span·class="s">&quot;public_key/include/public_key.hrl&quot;</span><span·class="p"·data-group-id="4951542751-1">)</span><span·class="p">.</span></code></pre><h2·id="data-types"·class="section-heading">
132 ··<a·href="#data-types"·class="hover-link">132 ··<a·href="#data-types"·class="hover-link">
133 ····<i·class="ri-link-m"·aria-hidden="true"></i>133 ····<i·class="ri-link-m"·aria-hidden="true"></i>
134 ··</a>134 ··</a>
135 ··<span·class="text">Data·Types</span>135 ··<span·class="text">Data·Types</span>
136 </h2>136 </h2>
137 <p>Common·non-standard·Erlang·data·types·used·to·describe·the·record·fields·in·the137 <p>Common·non-standard·Erlang·data·types·used·to·describe·the·record·fields·in·the
138 following·sections·and·which·are·not·defined·in·the·Public·Key138 following·sections·and·which·are·not·defined·in·the·Public·Key
139 <a·href="public_key.html">Reference·Manual</a>·follows·here:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">time</span><span·class="p"·data-group-id="8259268908-1">(</span><span·class="p"·data-group-id="8259268908-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">utc_time</span><span·class="p"·data-group-id="8259268908-2">(</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·230,·SHA:·2eed22d85cfbb8104128fd7cdb6dcec5cec1889570da112e5227fa5bd6ac325c·...·]8-3">)</span><span·class="w">139 <a·href="public_key.html">Reference·Manual</a>·follows·here:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">time</span><span·class="p"·data-group-id="0677116528-1">(</span><span·class="p"·data-group-id="0677116528-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">utc_time</span><span·class="p"·data-group-id="0677116528-2">(</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·230,·SHA:·5cb1443145fde5db5f171e3011f0dad400a8594e4dd7a28edd9754de1158d4ee·...·]8-3">)</span><span·class="w">
  
140 </span><span·class="nf">utc_time</span><span·class="p"·data-group-id="8259268908-4">(</span><span·class="p"·data-group-id="8259268908-4">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8259268908-5">{</span><span·class="ss">utcTime</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·112,·SHA:·82c94b320b0502d3ec7a21afe73ca0cc1781ce4de71a272673fe62e958d17736·...·]8-5">}</span><span·class="w">140 </span><span·class="nf">utc_time</span><span·class="p"·data-group-id="0677116528-4">(</span><span·class="p"·data-group-id="0677116528-4">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0677116528-5">{</span><span·class="ss">utcTime</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·112,·SHA:·561695d2c302f2849765c4f720da6354235c41a0004ef9559227ffaf581a04c3·...·]8-5">}</span><span·class="w">
  
141 </span><span·class="nf">general_time</span><span·class="p"·data-group-id="8259268908-6">(</span><span·class="p"·data-group-id="8259268908-6">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8259268908-7">{</span><span·class="ss">generalTime</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·117,·SHA:·794b35046b2475ccf988c3e7cda84c472eed03f14fb8a70cbb0acd5cf566711d·...·]8-7">}</span><span·class="w">141 </span><span·class="nf">general_time</span><span·class="p"·data-group-id="0677116528-6">(</span><span·class="p"·data-group-id="0677116528-6">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0677116528-7">{</span><span·class="ss">generalTime</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·117,·SHA:·f369885db96b8ecb8b05a1dd2d61c97db4e351e79b1e87b614160ac739ccb28e·...·]8-7">}</span><span·class="w">
  
142 </span><span·class="nf">general_name</span><span·class="p"·data-group-id="8259268908-8">(</span><span·class="p"·data-group-id="8259268908-8">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8259268908-9">{</span><span·class="ss">rfc822Name</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·204,·SHA:·c5d5da90711722b1d115fd8c0442103a05932859a8e749f0ae859cebaa76fa5e·...·]8-9">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">142 </span><span·class="nf">general_name</span><span·class="p"·data-group-id="0677116528-8">(</span><span·class="p"·data-group-id="0677116528-8">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0677116528-9">{</span><span·class="ss">rfc822Name</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·204,·SHA:·e6e2e1cc25b148713ad47af3bfaef1e4a549ced9fe94c8bfda20f630b3a6bdbd·...·]8-9">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
143 ·················</span><span·class="p"·data-group-id="8259268908-11">{</span><span·class="ss">dNSName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-12">(</span><span·class="p"·data-group-id="8259268908-12">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·24,·SHA:·cbbf6cf7c14b667907395b6d19fd59d69d37aeb4435b8bb5df07b5c015fbe0db·...·]8-11">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">143 ·················</span><span·class="p"·data-group-id="0677116528-11">{</span><span·class="ss">dNSName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-12">(</span><span·class="p"·data-group-id="0677116528-12">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·24,·SHA:·1544bea5ea2c6402bb529609d131e30bf26648bb52633184393fac321b657887·...·]8-11">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
144 ·················</span><span·class="p"·data-group-id="8259268908-13">{</span><span·class="ss">x400Address</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-14">(</span><span·class="p"·data-group-id="8259268908-14">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">144 ·················</span><span·class="p"·data-group-id="0677116528-13">{</span><span·class="ss">x400Address</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-14">(</span><span·class="p"·data-group-id="0677116528-14">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
145 ·················</span><span·class="p"·data-group-id="8259268908-15">{</span><span·class="ss">directoryName</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8259268908-16">{</span><span·class="ss">rdnSequence</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·378,·SHA:·c15c7eb9ed2615db722d3cba17e6cf15fda51652e57b151f5e31d63c77b61a6f·...·]8-15">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">145 ·················</span><span·class="p"·data-group-id="0677116528-15">{</span><span·class="ss">directoryName</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0677116528-16">{</span><span·class="ss">rdnSequence</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·378,·SHA:·c057d1ff80b78c3e2e89e8080d90d70fb28fe7ffd010b074e56583d8f8eb4b9d·...·]8-15">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
146 ·················</span><span·class="p"·data-group-id="8259268908-19">{</span><span·class="ss">ediPartyName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">special_string</span><span·class="p"·data-group-id="8259268908-20">(</span><span·class="p"·data-group-id="8259268908-20">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·0ff73823616186259d5804169a22db8f809eba42bce94864569e9aaf9787c3c9·...·]8-19">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">146 ·················</span><span·class="p"·data-group-id="0677116528-19">{</span><span·class="ss">ediPartyName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">special_string</span><span·class="p"·data-group-id="0677116528-20">(</span><span·class="p"·data-group-id="0677116528-20">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·47291e153d6d29f5ffc62e06df01537836e23eef82092929625b2f31f24534b3·...·]8-19">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
147 ·················</span><span·class="p"·data-group-id="8259268908-21">{</span><span·class="ss">ediPartyName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">special_string</span><span·class="p"·data-group-id="8259268908-22">(</span><span·class="p"·data-group-id="8259268908-22">)</span><sp[·...·truncated·by·diffoscope;·len:·231,·SHA:·6ade87d98354635d831fe197872ef633213fe5f57617639c74ab3a74f2b0074e·...·]8-21">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">147 ·················</span><span·class="p"·data-group-id="0677116528-21">{</span><span·class="ss">ediPartyName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">special_string</span><span·class="p"·data-group-id="0677116528-22">(</span><span·class="p"·data-group-id="0677116528-22">)</span><sp[·...·truncated·by·diffoscope;·len:·231,·SHA:·ae955838a751a1bca1919cabdb6b9f2e8893361eae9a53247c5258740b3bf938·...·]8-21">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
148 ·················</span><span·class="p"·data-group-id="8259268908-24">{</span><span·class="ss">uniformResourceIdentifier</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-25">(</span><span·class="p"·data-group-id="8259268908-25">)</spa[·...·truncated·by·diffoscope;·len:·42,·SHA:·90c2145bd7ec1c539a069d849ff89a1c7aaa9bafcef99f05ba4f8c62a14d2991·...·]8-24">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">148 ·················</span><span·class="p"·data-group-id="0677116528-24">{</span><span·class="ss">uniformResourceIdentifier</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-25">(</span><span·class="p"·data-group-id="0677116528-25">)</spa[·...·truncated·by·diffoscope;·len:·42,·SHA:·04164b4ecfdcdfc3f52000d73c4da579402c36269dd292d019738d43ad5f8abe·...·]8-24">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
149 ·················</span><span·class="p"·data-group-id="8259268908-26">{</span><span·class="ss">iPAddress</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-27">(</span><span·class="p"·data-group-id="8259268908-27">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·26,·SHA:·942df0429f8d117f9867ba207839b7395f59d217e4b15343cd833cdaf0cbc076·...·]8-26">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">149 ·················</span><span·class="p"·data-group-id="0677116528-26">{</span><span·class="ss">iPAddress</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-27">(</span><span·class="p"·data-group-id="0677116528-27">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·26,·SHA:·282e76ed158c9aa24f446554b4b24328ba928509118aed9abca03eea79f9dcbe·...·]8-26">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
150 ·················</span><span·class="p"·data-group-id="8259268908-28">{</span><span·class="ss">registeredId</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">oid</span><span·class="p"·data-group-id="8259268908-29">(</span><span·class="p"·data-group-id="8259268908-29">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·26,·SHA:·942df0429f8d117f9867ba207839b7395f59d217e4b15343cd833cdaf0cbc076·...·]8-28">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">150 ·················</span><span·class="p"·data-group-id="0677116528-28">{</span><span·class="ss">registeredId</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">oid</span><span·class="p"·data-group-id="0677116528-29">(</span><span·class="p"·data-group-id="0677116528-29">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·26,·SHA:·282e76ed158c9aa24f446554b4b24328ba928509118aed9abca03eea79f9dcbe·...·]8-28">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
151 ·················</span><span·class="p"·data-group-id="8259268908-30">{</span><span·class="ss">otherName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="8259268908-31">(</span><span·class="p"·data-group-id="8259268908-31">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·24,·SHA:·cbbf6cf7c14b667907395b6d19fd59d69d37aeb4435b8bb5df07b5c015fbe0db·...·]8-30">}</span><span·class="w">151 ·················</span><span·class="p"·data-group-id="0677116528-30">{</span><span·class="ss">otherName</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="0677116528-31">(</span><span·class="p"·data-group-id="0677116528-31">)</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·24,·SHA:·1544bea5ea2c6402bb529609d131e30bf26648bb52633184393fac321b657887·...·]8-30">}</span><span·class="w">
  
152 </span><span·class="nf">special_string</span><span·class="p"·data-group-id="8259268908-32">(</span><span·class="p"·data-group-id="8259268908-32">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8259268908-33">{</span><span·class="ss">teletexString</span><span·class="p">[·...·truncated·by·diffoscope;·len:·210,·SHA:·e36a96c5097d1161e0523e23f67667fff1ccf8b36a52c31f1c3cab3394e91306·...·]8-33">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">152 </span><span·class="nf">special_string</span><span·class="p"·data-group-id="0677116528-32">(</span><span·class="p"·data-group-id="0677116528-32">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0677116528-33">{</span><span·class="ss">teletexString</span><span·class="p">[·...·truncated·by·diffoscope;·len:·210,·SHA:·5b84cbc3dbbb902d961c10c2174485b5c9f69b0af2f410087624a4a32365109c·...·]8-33">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
153 ·153 ·
154 ···················</span><span·class="p"·data-group-id="8259268908-35">{</span><span·class="ss">printableString</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-36">(</span><span·class="p"·data-group-id="8259268908-36">)</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·0162c1943fb27091c3867a1334d7649546630502473eb569863742eaace9adaf·...·]8-35">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">154 ···················</span><span·class="p"·data-group-id="0677116528-35">{</span><span·class="ss">printableString</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-36">(</span><span·class="p"·data-group-id="0677116528-36">)</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·812e6a8f1321c83a655dc6d8f5bda182c3fb44f2c13d413d83d270457627a61c·...·]8-35">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
155 ···················</span><span·class="p"·data-group-id="8259268908-37">{</span><span·class="ss">universalString</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-38">(</span><span·class="p"·data-group-id="8259268908-38">)</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·0162c1943fb27091c3867a1334d7649546630502473eb569863742eaace9adaf·...·]8-37">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">155 ···················</span><span·class="p"·data-group-id="0677116528-37">{</span><span·class="ss">universalString</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-38">(</span><span·class="p"·data-group-id="0677116528-38">)</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·812e6a8f1321c83a655dc6d8f5bda182c3fb44f2c13d413d83d270457627a61c·...·]8-37">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
156 ···················</span><span·class="p"·data-group-id="8259268908-39">{</span><span·class="ss">utf8String</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="8259268908-40">(</span><span·class="p"·data-group-id="8259268908-40">)</span><span·class="[·...·truncated·by·diffoscope;·len:·27,·SHA:·cbf53578bdd5f723bb53cfa2e48b4c2538729413c8c12af25f3c523d85ae0981·...·]8-39">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">156 ···················</span><span·class="p"·data-group-id="0677116528-39">{</span><span·class="ss">utf8String</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="0677116528-40">(</span><span·class="p"·data-group-id="0677116528-40">)</span><span·class="[·...·truncated·by·diffoscope;·len:·27,·SHA:·4095017a09718db89d3c20fa201631ad52031dfa1f7cecb1f27adc2aae13c975·...·]8-39">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
  
157 ···················</span><span·class="p"·data-group-id="8259268908-41">{</span><span·class="ss">bmpString</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="8259268908-42">(</span><span·class="p"·data-group-id="8259268908-42">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·26,·SHA:·942df0429f8d117f9867ba207839b7395f59d217e4b15343cd833cdaf0cbc076·...·]8-41">}</span><span·class="w">157 ···················</span><span·class="p"·data-group-id="0677116528-41">{</span><span·class="ss">bmpString</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0677116528-42">(</span><span·class="p"·data-group-id="0677116528-42">)</span><span·class="p[·...·truncated·by·diffoscope;·len:·26,·SHA:·282e76ed158c9aa24f446554b4b24328ba928509118aed9abca03eea79f9dcbe·...·]8-41">}</span><span·class="w">
  
158 </span><span·class="nf">dist_reason</span><span·class="p"·data-group-id="8259268908-43">(</span><span·class="p"·data-group-id="8259268908-43">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">unused</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">keyCompromise</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">cACompromise</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">affiliationChanged</span><span·class="w">·</span><span·class="p">|</span><span·class="w">158 </span><span·class="nf">dist_reason</span><span·class="p"·data-group-id="0677116528-43">(</span><span·class="p"·data-group-id="0677116528-43">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">unused</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">keyCompromise</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">cACompromise</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">affiliationChanged</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
159 ················</span><span·class="ss">cessationOfOperation</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">certificateHold</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">privilegeWithdrawn</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">aACompromise</span><span·class="w">159 ················</span><span·class="ss">cessationOfOperation</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">certificateHold</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">privilegeWithdrawn</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">aACompromise</span><span·class="w">
  
160 </span><span·class="n">OID_macro</span><span·class="p"·data-group-id="8259268908-44">(</span><span·class="p"·data-group-id="8259268908-44">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">OID_name</span><span·class="p"·data-group-id="8259268908-45">(</spa[·...·truncated·by·diffoscope;·len:·42,·SHA:·90c2145bd7ec1c539a069d849ff89a1c7aaa9bafcef99f05ba4f8c62a14d2991·...·]8-45">)</span><span·class="w">160 </span><span·class="n">OID_macro</span><span·class="p"·data-group-id="0677116528-44">(</span><span·class="p"·data-group-id="0677116528-44">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">OID_name</span><span·class="p"·data-group-id="0677116528-45">(</spa[·...·truncated·by·diffoscope;·len:·42,·SHA:·04164b4ecfdcdfc3f52000d73c4da579402c36269dd292d019738d43ad5f8abe·...·]8-45">)</span><span·class="w">
  
161 </span><span·class="n">OID_name</span><span·class="p"·data-group-id="8259268908-46">(</span><span·class="p"·data-group-id="8259268908-46">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="8259268908-47">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·021feeac80f560d17ccfb044d1d07ca7399d5b70b73e5fb84c366ece10dde647·...·]8-47">)</span></code></pre><h2·id="rsa"·class="section-heading">161 </span><span·class="n">OID_name</span><span·class="p"·data-group-id="0677116528-46">(</span><span·class="p"·data-group-id="0677116528-46">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0677116528-47">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·b7669dfd37bbb2093d7f66aa8deef9a0aa96d82dc13a3c074bbada376ee60dd4·...·]8-47">)</span></code></pre><h2·id="rsa"·class="section-heading">
162 ··<a·href="#rsa"·class="hover-link">162 ··<a·href="#rsa"·class="hover-link">
163 ····<i·class="ri-link-m"·aria-hidden="true"></i>163 ····<i·class="ri-link-m"·aria-hidden="true"></i>
164 ··</a>164 ··</a>
165 ··<span·class="text">RSA</span>165 ··<span·class="text">RSA</span>
166 </h2>166 </h2>
167 <p>Erlang·representation·of167 <p>Erlang·representation·of
168 <a·href="http://www.ietf.org/rfc/rfc3447.txt">Rivest-Shamir-Adleman·cryptosystem·(RSA)</a>168 <a·href="http://www.ietf.org/rfc/rfc3447.txt">Rivest-Shamir-Adleman·cryptosystem·(RSA)</a>
169 keys·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">&#39;RSAPublicKey&#39;</span><span·class="p"·data-group-id="5137592374-1">{</span><span·class="w">169 keys·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">&#39;RSAPublicKey&#39;</span><span·class="p"·data-group-id="8082053258-1">{</span><span·class="w">
170 ···</span><span·class="ss">modulus</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·pos_integer()</span><span·class="w">170 ···</span><span·class="ss">modulus</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·pos_integer()</span><span·class="w">
171 ···</span><span·class="ss">publicExponent</span><span·class="w">·</span><span·class="c1">%·pos_integer()</span><span·class="w">171 ···</span><span·class="ss">publicExponent</span><span·class="w">·</span><span·class="c1">%·pos_integer()</span><span·class="w">
172 ··</span><span·class="p"·data-group-id="5137592374-1">}</span><span·class="p">.</span><span·class="w">172 ··</span><span·class="p"·data-group-id="8082053258-1">}</span><span·class="p">.</span><span·class="w">
  
173 </span><span·class="o">#</span><span·class="ss">&#39;RSAPrivateKey&#39;</span><span·class="p"·data-group-id="5137592374-2">{</span><span·class="w">173 </span><span·class="o">#</span><span·class="ss">&#39;RSAPrivateKey&#39;</span><span·class="p"·data-group-id="8082053258-2">{</span><span·class="w">
174 ···</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·two-prime·|·multi</span><span·class="w">174 ···</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·two-prime·|·multi</span><span·class="w">
175 ···</span><span·class="ss">modulus</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·pos_integer()</span><span·class="w">175 ···</span><span·class="ss">modulus</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·pos_integer()</span><span·class="w">
176 ···</span><span·class="ss">publicExponent</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·pos_integer()</span><span·class="w">176 ···</span><span·class="ss">publicExponent</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·pos_integer()</span><span·class="w">
177 ···</span><span·class="ss">privateExponent</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·pos_integer()</span><span·class="w">177 ···</span><span·class="ss">privateExponent</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·pos_integer()</span><span·class="w">
178 ···</span><span·class="ss">prime1</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·pos_integer()</span><span·class="w">178 ···</span><span·class="ss">prime1</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·pos_integer()</span><span·class="w">
179 ···</span><span·class="ss">prime2</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·pos_integer()</span><span·class="w">179 ···</span><span·class="ss">prime2</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·pos_integer()</span><span·class="w">
180 ···</span><span·class="ss">exponent1</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·pos_integer()</span><span·class="w">180 ···</span><span·class="ss">exponent1</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·pos_integer()</span><span·class="w">
181 ···</span><span·class="ss">exponent2</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·pos_integer()</span><span·class="w">181 ···</span><span·class="ss">exponent2</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·pos_integer()</span><span·class="w">
182 ···</span><span·class="ss">coefficient</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%·pos_integer()</span><span·class="w">182 ···</span><span·class="ss">coefficient</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%·pos_integer()</span><span·class="w">
183 ···</span><span·class="ss">otherPrimeInfos</span><span·class="w">··</span><span·class="c1">%·[#OtherPrimeInfo{}]·|·asn1_NOVALUE</span><span·class="w">183 ···</span><span·class="ss">otherPrimeInfos</span><span·class="w">··</span><span·class="c1">%·[#OtherPrimeInfo{}]·|·asn1_NOVALUE</span><span·class="w">
184 ··</span><span·class="p"·data-group-id="5137592374-2">}</span><span·class="p">.</span><span·class="w">184 ··</span><span·class="p"·data-group-id="8082053258-2">}</span><span·class="p">.</span><span·class="w">
  
185 </span><span·class="o">#</span><span·class="ss">&#39;OtherPrimeInfo&#39;</span><span·class="p"·data-group-id="5137592374-3">{</span><span·class="w">185 </span><span·class="o">#</span><span·class="ss">&#39;OtherPrimeInfo&#39;</span><span·class="p"·data-group-id="8082053258-3">{</span><span·class="w">
186 ···</span><span·class="ss">prime</span><span·class="p">,</span><span·class="w">···········</span><span·class="c1">%·pos_integer()</span><span·class="w">186 ···</span><span·class="ss">prime</span><span·class="p">,</span><span·class="w">···········</span><span·class="c1">%·pos_integer()</span><span·class="w">
187 ···</span><span·class="ss">exponent</span><span·class="p">,</span><span·class="w">········</span><span·class="c1">%·pos_integer()</span><span·class="w">187 ···</span><span·class="ss">exponent</span><span·class="p">,</span><span·class="w">········</span><span·class="c1">%·pos_integer()</span><span·class="w">
188 ···</span><span·class="ss">coefficient</span><span·class="w">······</span><span·class="c1">%·pos_integer()</span><span·class="w">188 ···</span><span·class="ss">coefficient</span><span·class="w">······</span><span·class="c1">%·pos_integer()</span><span·class="w">
189 ··</span><span·class="p"·data-group-id="5137592374-3">}</span><span·class="p">.</span><span·class="w">189 ··</span><span·class="p"·data-group-id="8082053258-3">}</span><span·class="p">.</span><span·class="w">
  
190 </span><span·class="o">#</span><span·class="ss">&#39;RSASSA-PSS-params&#39;</span><span·class="p"·data-group-id="5137592374-4">{</span><span·class="w">190 </span><span·class="o">#</span><span·class="ss">&#39;RSASSA-PSS-params&#39;</span><span·class="p"·data-group-id="8082053258-4">{</span><span·class="w">
191 ···</span><span·class="ss">hashAlgorithm</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%·#&#39;HashAlgorithm&#39;{}},</span><span·class="w">191 ···</span><span·class="ss">hashAlgorithm</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%·#&#39;HashAlgorithm&#39;{}},</span><span·class="w">
192 ···</span><span·class="ss">maskGenAlgorithm</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·#&#39;MaskGenAlgorithm&#39;{}},</span><span·class="w">192 ···</span><span·class="ss">maskGenAlgorithm</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·#&#39;MaskGenAlgorithm&#39;{}},</span><span·class="w">
193 ···</span><span·class="ss">saltLength</span><span·class="p">,</span><span·class="w">········</span><span·class="c1">%·pos_integer(),</span><span·class="w">193 ···</span><span·class="ss">saltLength</span><span·class="p">,</span><span·class="w">········</span><span·class="c1">%·pos_integer(),</span><span·class="w">
194 ···</span><span·class="ss">trailerField</span><span·class="p">,</span><span·class="w">······</span><span·class="c1">%·pos_integer()</span><span·class="w">194 ···</span><span·class="ss">trailerField</span><span·class="p">,</span><span·class="w">······</span><span·class="c1">%·pos_integer()</span><span·class="w">
195 ··</span><span·class="p"·data-group-id="5137592374-4">}</span><span·class="p">.</span><span·class="w">195 ··</span><span·class="p"·data-group-id="8082053258-4">}</span><span·class="p">.</span><span·class="w">
  
196 </span><span·class="o">#</span><span·class="ss">&#39;HashAlgorithm&#39;</span><span·class="p"·data-group-id="5137592374-5">{</span><span·class="w">196 </span><span·class="o">#</span><span·class="ss">&#39;HashAlgorithm&#39;</span><span·class="p"·data-group-id="8082053258-5">{</span><span·class="w">
197 ···</span><span·class="ss">algorithm</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·oid()</span><span·class="w">197 ···</span><span·class="ss">algorithm</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·oid()</span><span·class="w">
198 ···</span><span·class="ss">parameters</span><span·class="w">··</span><span·class="c1">%·defaults·to·asn1_NOVALUE</span><span·class="w">198 ···</span><span·class="ss">parameters</span><span·class="w">··</span><span·class="c1">%·defaults·to·asn1_NOVALUE</span><span·class="w">
199 ··</span><span·class="p"·data-group-id="5137592374-5">}</span><span·class="p">.</span><span·class="w">199 ··</span><span·class="p"·data-group-id="8082053258-5">}</span><span·class="p">.</span><span·class="w">
  
200 </span><span·class="o">#</span><span·class="ss">&#39;MaskGenAlgorithm&#39;</span><span·class="p"·data-group-id="5137592374-6">{</span><span·class="w">200 </span><span·class="o">#</span><span·class="ss">&#39;MaskGenAlgorithm&#39;</span><span·class="p"·data-group-id="8082053258-6">{</span><span·class="w">
201 ···</span><span·class="ss">algorithm</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·oid()</span><span·class="w">201 ···</span><span·class="ss">algorithm</span><span·class="p">,</span><span·class="w">··</span><span·class="c1">%·oid()</span><span·class="w">
202 ···</span><span·class="ss">parameters</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·defaults·to·asn1_NOVALUE</span><span·class="w">202 ···</span><span·class="ss">parameters</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·defaults·to·asn1_NOVALUE</span><span·class="w">
203 ··</span><span·class="p"·data-group-id="5137592374-6">}</span><span·class="p">.</span></code></pre><h2·id="dsa"·class="section-heading">203 ··</span><span·class="p"·data-group-id="8082053258-6">}</span><span·class="p">.</span></code></pre><h2·id="dsa"·class="section-heading">
204 ··<a·href="#dsa"·class="hover-link">204 ··<a·href="#dsa"·class="hover-link">
205 ····<i·class="ri-link-m"·aria-hidden="true"></i>205 ····<i·class="ri-link-m"·aria-hidden="true"></i>
206 ··</a>206 ··</a>
207 ··<span·class="text">DSA</span>207 ··<span·class="text">DSA</span>
208 </h2>208 </h2>
209 <p>Erlang·representation·of209 <p>Erlang·representation·of
210 <a·href="http://www.ietf.org/rfc/rfc6979.txt">Digital·Signature·Algorithm·(DSA)</a>·keys</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">&#39;DSAPrivateKey&#39;</span><span·class="p"·data-group-id="6372027219-1">{</span><span·class="w">210 <a·href="http://www.ietf.org/rfc/rfc6979.txt">Digital·Signature·Algorithm·(DSA)</a>·keys</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">&#39;DSAPrivateKey&#39;</span><span·class="p"·data-group-id="6419281752-1">{</span><span·class="w">
211 ···</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">······</span><span·class="c1">%·pos_integer()</span><span·class="w">211 ···</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">······</span><span·class="c1">%·pos_integer()</span><span·class="w">
212 ···</span><span·class="ss">p</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">212 ···</span><span·class="ss">p</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">
213 ···</span><span·class="ss">q</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">213 ···</span><span·class="ss">q</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">
214 ···</span><span·class="ss">g</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">214 ···</span><span·class="ss">g</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">
215 ···</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">215 ···</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·pos_integer()</span><span·class="w">
216 ···</span><span·class="ss">x</span><span·class="w">·············</span><span·class="c1">%·pos_integer()</span><span·class="w">216 ···</span><span·class="ss">x</span><span·class="w">·············</span><span·class="c1">%·pos_integer()</span><span·class="w">
217 ··</span><span·class="p"·data-group-id="6372027219-1">}</span><span·class="p">.</span><span·class="w">217 ··</span><span·class="p"·data-group-id="6419281752-1">}</span><span·class="p">.</span><span·class="w">
  
218 </span><span·class="o">#</span><span·class="ss">&#39;Dss-Parms&#39;</span><span·class="p"·data-group-id="6372027219-2">{</span><span·class="w">218 </span><span·class="o">#</span><span·class="ss">&#39;Dss-Parms&#39;</span><span·class="p"·data-group-id="6419281752-2">{</span><span·class="w">
219 ···</span><span·class="ss">p</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·pos_integer()</span><span·class="w">219 ···</span><span·class="ss">p</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·pos_integer()</span><span·class="w">
220 ···</span><span·class="ss">q</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·pos_integer()</span><span·class="w">220 ···</span><span·class="ss">q</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·pos_integer()</span><span·class="w">
221 ···</span><span·class="ss">g</span><span·class="w">··········</span><span·class="c1">%·pos_integer()</span><span·class="w">221 ···</span><span·class="ss">g</span><span·class="w">··········</span><span·class="c1">%·pos_integer()</span><span·class="w">
222 ··</span><span·class="p"·data-group-id="6372027219-2">}</span><span·class="p">.</span></code></pre><h2·id="ecdsa-and-eddsa"·class="section-heading">222 ··</span><span·class="p"·data-group-id="6419281752-2">}</span><span·class="p">.</span></code></pre><h2·id="ecdsa-and-eddsa"·class="section-heading">
223 ··<a·href="#ecdsa-and-eddsa"·class="hover-link">223 ··<a·href="#ecdsa-and-eddsa"·class="hover-link">
224 ····<i·class="ri-link-m"·aria-hidden="true"></i>224 ····<i·class="ri-link-m"·aria-hidden="true"></i>
225 ··</a>225 ··</a>
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148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
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187 ····</footer>187 ····</footer>
188 ··</div>188 ··</div>
189 </main>189 </main>
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782 ······</p>782 ······</p>
783 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>783 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
784 ····</footer>784 ····</footer>
785 ··</div>785 ··</div>
786 </main>786 </main>
787 </div>787 </div>
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2752 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2752 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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147 ····</footer>147 ····</footer>
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825 ··········<pre·translate="no"><span·class="attribute">-spec</span>·restore_tag(true·|·{<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()·|·[]})·->·true.</pre>825 ··········<pre·translate="no"><span·class="attribute">-spec</span>·restore_tag(true·|·{<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()·|·[]})·->·true.</pre>
  
826 ······</div>826 ······</div>
  
827 <p>Restores·the·previous·state·of·user·tags·and·their·spreading·as·it·was·before·a827 <p>Restores·the·previous·state·of·user·tags·and·their·spreading·as·it·was·before·a
828 call·to·<a·href="#spread_tag/1"><code·class="inline">spread_tag/1</code></a>.</p><p>Note·that·the·restoring·is·not·limited·to·the·same·process;·one·can828 call·to·<a·href="#spread_tag/1"><code·class="inline">spread_tag/1</code></a>.</p><p>Note·that·the·restoring·is·not·limited·to·the·same·process;·one·can
829 utilize·this·to·turn·off·spreding·in·one·process·and·restore·it·in·a829 utilize·this·to·turn·off·spreding·in·one·process·and·restore·it·in·a
830 newly·created·process·that·is·is·actually·going·to·send·messages:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="3636844153-1">(</span><span·class="p"·data-group-id="3636844153-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">830 newly·created·process·that·is·is·actually·going·to·send·messages:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="7872074543-1">(</span><span·class="p"·data-group-id="7872074543-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
831 ····</span><span·class="n">TagData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">spread_tag</span><span·class="p"·data-group-id="3636844153-2">(</span><span·class="ss">false</span><span·class="p"·data-group-id="3636844153-2">)</span><span·class="p">,</span><span·class="w">831 ····</span><span·class="n">TagData</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">spread_tag</span><span·class="p"·data-group-id="7872074543-2">(</span><span·class="ss">false</span><span·class="p"·data-group-id="7872074543-2">)</span><span·class="p">,</span><span·class="w">
832 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="3636844153-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3636844153-4">(</span><span·class="p"·data-group-id="3636844153-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">832 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="7872074543-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7872074543-4">(</span><span·class="p"·data-group-id="7872074543-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
833 ·············</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">restore_tag</span><span·class="p"·data-group-id="3636844153-5">(</span><span·class="n">TagData</span><span·class="p"·data-group-id="3636844153-5">)</span><span·class="p">,</span><span·class="w">833 ·············</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">restore_tag</span><span·class="p"·data-group-id="7872074543-5">(</span><span·class="n">TagData</span><span·class="p"·data-group-id="7872074543-5">)</span><span·class="p">,</span><span·class="w">
834 ·············</span><span·class="nf">do_something</span><span·class="p"·data-group-id="3636844153-6">(</span><span·class="p"·data-group-id="3636844153-6">)</span><span·class="w">834 ·············</span><span·class="nf">do_something</span><span·class="p"·data-group-id="7872074543-6">(</span><span·class="p"·data-group-id="7872074543-6">)</span><span·class="w">
835 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="3636844153-3">)</span><span·class="p">,</span><span·class="w">835 ··········</span><span·class="k">end</span><span·class="p"·data-group-id="7872074543-3">)</span><span·class="p">,</span><span·class="w">
836 ····</span><span·class="nf">do_something_else</span><span·class="p"·data-group-id="3636844153-7">(</span><span·class="p"·data-group-id="3636844153-7">)</span><span·class="p">,</span><span·class="w">836 ····</span><span·class="nf">do_something_else</span><span·class="p"·data-group-id="7872074543-7">(</span><span·class="p"·data-group-id="7872074543-7">)</span><span·class="p">,</span><span·class="w">
837 ····</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">restore_tag</span><span·class="p"·data-group-id="3636844153-8">(</span><span·class="n">TagData</span><span·class="p"·data-group-id="3636844153-8">)</span><span·class="p">.</span></code></pre><p>Correctly·handling·user·tags·and·their·spreading·might·take·some·effort,·as837 ····</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">restore_tag</span><span·class="p"·data-group-id="7872074543-8">(</span><span·class="n">TagData</span><span·class="p"·data-group-id="7872074543-8">)</span><span·class="p">.</span></code></pre><p>Correctly·handling·user·tags·and·their·spreading·might·take·some·effort,·as
838 Erlang·programs·tend·to·send·and·receive·messages·so·that·sometimes·the·user·tag838 Erlang·programs·tend·to·send·and·receive·messages·so·that·sometimes·the·user·tag
839 gets·lost·due·to·various·things,·like·double·receives·or·communication·with·a839 gets·lost·due·to·various·things,·like·double·receives·or·communication·with·a
840 port·(ports·do·not·handle·user·tags,·in·the·same·way·as·they·do·not·handle840 port·(ports·do·not·handle·user·tags,·in·the·same·way·as·they·do·not·handle
841 regular·sequential·trace·tokens).</p>841 regular·sequential·trace·tokens).</p>
842 ··</section>842 ··</section>
843 </section>843 </section>
844 <section·class="detail"·id="spread_tag/1">844 <section·class="detail"·id="spread_tag/1">
Offset 877, 20 lines modifiedOffset 877, 20 lines modified
877 <a·href="#restore_tag/1"><code·class="inline">restore_tag/1</code></a>,·one·can·enable·or·disable·spreading·of·user877 <a·href="#restore_tag/1"><code·class="inline">restore_tag/1</code></a>,·one·can·enable·or·disable·spreading·of·user
878 tags·to·other·processes·and·then·restore·the·previous·state·of·the·user·tag.·The878 tags·to·other·processes·and·then·restore·the·previous·state·of·the·user·tag.·The
879 TagData·returned·from·this·call·contains·all·previous·information·so·the·state879 TagData·returned·from·this·call·contains·all·previous·information·so·the·state
880 (including·any·previously·spread·user·tags)·will·be·completely·restored·by·a880 (including·any·previously·spread·user·tags)·will·be·completely·restored·by·a
881 later·call·to·<a·href="#restore_tag/1"><code·class="inline">restore_tag/1</code></a>.</p><p>The·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>·module·already·spreads·tags,·so·there·is·no·need·to·manually·call881 later·call·to·<a·href="#restore_tag/1"><code·class="inline">restore_tag/1</code></a>.</p><p>The·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>·module·already·spreads·tags,·so·there·is·no·need·to·manually·call
882 this·function·to·get·user·tags·spread·to·the·<code·class="inline">efile</code>·driver·through·that·module.</p><p>The·most·use·of·this·function·would·be·if·one,·for·example,·uses·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html"><code·class="inline">io</code></a>·module882 this·function·to·get·user·tags·spread·to·the·<code·class="inline">efile</code>·driver·through·that·module.</p><p>The·most·use·of·this·function·would·be·if·one,·for·example,·uses·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html"><code·class="inline">io</code></a>·module
883 to·communicate·with·an·I/O-server·for·a·regular·file,·such·as·in·the·following883 to·communicate·with·an·I/O-server·for·a·regular·file,·such·as·in·the·following
884 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="6385045147-1">(</span><span·class="p"·data-group-id="6385045147-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">884 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">f</span><span·class="p"·data-group-id="5715668399-1">(</span><span·class="p"·data-group-id="5715668399-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
885 ···</span><span·class="p"·data-group-id="6385045147-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="6385045147-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·389,·SHA:·bfbc2dc8ed54716c0ee0f230a18b6643a5177b7fe4316d32601ed3e4aebf9986·...·]-3">)</span><span·class="p">,</span><span·class="w">885 ···</span><span·class="p"·data-group-id="5715668399-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·class="p"·data-group-id="5715668399-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·389,·SHA:·b94ba69cb507c5a450f40545057d960b6affb37155f5a36e49dac408c661b722·...·]-3">)</span><span·class="p">,</span><span·class="w">
886 ···</span><span·class="n">Saved</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">spread_tag</span><span·class="p"·data-group-id="6385045147-5">(</span><span·class="ss">true</span><span·class="p"·data-group-id="6385045147-5">)</span><span·class="p">,</span><span·class="w">886 ···</span><span·class="n">Saved</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">spread_tag</span><span·class="p"·data-group-id="5715668399-5">(</span><span·class="ss">true</span><span·class="p"·data-group-id="5715668399-5">)</span><span·class="p">,</span><span·class="w">
887 ···</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6385045147-6">(</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Hello·world!&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6385045147-7">[</span><span·class="p[·...·truncated·by·diffoscope;·len:·80,·SHA:·9df39d76342c0c2035d57581ec3bd30bac68dd3e280230672e202d78dfdecde4·...·]-6">)</span><span·class="p">,</span><span·class="w">887 ···</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5715668399-6">(</span><span·class="n">F</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Hello·world!&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5715668399-7">[</span><span·class="p[·...·truncated·by·diffoscope;·len:·80,·SHA:·a495418e94bbb99b0bab981adec6ab426da40826d9987b7294266956ae18ee5e·...·]-6">)</span><span·class="p">,</span><span·class="w">
888 ···</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">restore_tag</span><span·class="p"·data-group-id="6385045147-8">(</span><span·class="n">Saved</span><span·class="p"·data-group-id="6385045147-8">)</span><span·class="p">,</span><span·class="w">888 ···</span><span·class="nc">dyntrace</span><span·class="p">:</span><span·class="nf">restore_tag</span><span·class="p"·data-group-id="5715668399-8">(</span><span·class="n">Saved</span><span·class="p"·data-group-id="5715668399-8">)</span><span·class="p">,</span><span·class="w">
889 ···</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="6385045147-9">(</span><span·class="n">F</span><span·class="p"·data-group-id="6385045147-9">)</span><span·class="p">.</span></code></pre><p>In·this·example,·any·user·tag·set·in·the·calling·process·will·be·spread·to·the889 ···</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5715668399-9">(</span><span·class="n">F</span><span·class="p"·data-group-id="5715668399-9">)</span><span·class="p">.</span></code></pre><p>In·this·example,·any·user·tag·set·in·the·calling·process·will·be·spread·to·the
890 I/O-server·when·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#format/3"><code·class="inline">io:format/3</code></a>·call·is·done.</p>890 I/O-server·when·the·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#format/3"><code·class="inline">io:format/3</code></a>·call·is·done.</p>
891 ··</section>891 ··</section>
892 </section>892 </section>
  
893 ····</div>893 ····</div>
894 ··</section>894 ··</section>
  
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912 ······<p·class="built-using">912 ······<p·class="built-using">
913 ········Built·using913 ········Built·using
914 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the914 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
915 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>915 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
916 ······</p>916 ······</p>
917 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>917 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
918 ····</footer>918 ····</footer>
919 ··</div>919 ··</div>
920 </main>920 </main>
921 </div>921 </div>
922 <script>922 <script>
923 ··function·mermaidLoaded()·{923 ··function·mermaidLoaded()·{
924 ····mermaid.initialize({924 ····mermaid.initialize({
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345 ······</div>345 ······</div>
  
346 <p>A·histogram·of·block·sizes·where·each·interval's·upper·bound·is·twice·as·high·as346 <p>A·histogram·of·block·sizes·where·each·interval's·upper·bound·is·twice·as·high·as
347 the·one·before·it.</p><p>The·upper·bound·of·the·first·interval·is·provided·by·the·function·that·returned347 the·one·before·it.</p><p>The·upper·bound·of·the·first·interval·is·provided·by·the·function·that·returned
348 the·histogram,·and·the·last·interval·has·no·upper·bound.</p><p>For·example,·the·histogram·below·has·40·(<code·class="inline">message</code>)·blocks·between·128-256·bytes348 the·histogram,·and·the·last·interval·has·no·upper·bound.</p><p>For·example,·the·histogram·below·has·40·(<code·class="inline">message</code>)·blocks·between·128-256·bytes
349 in·size,·78·blocks·between·256-512·bytes,2·blocks·between·512-1024·bytes,·and·2349 in·size,·78·blocks·between·256-512·bytes,2·blocks·between·512-1024·bytes,·and·2
350 blocks·between·1-2KB.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">instrument</span><span·class="p">:</span><span·class="nf">allocations</span><span·class="p"·data-group-id="7592921365-1">(</span><span·class="p"·data-group-id="7592921365-2">#{</span><span·class="w">·</span><span·class="ss">histogram_start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">128</span><span·class="p[·...·truncated·by·diffoscope;·len:·293,·SHA:·1a7688bb229d15478fcf57f88420afdb9bb993341c288149ebafe606ba62d605·...·]-1">)</span><span·class="p">.</span><span·class="w">350 blocks·between·1-2KB.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">instrument</span><span·class="p">:</span><span·class="nf">allocations</span><span·class="p"·data-group-id="9284521522-1">(</span><span·class="p"·data-group-id="9284521522-2">#{</span><span·class="w">·</span><span·class="ss">histogram_start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">128</span><span·class="p[·...·truncated·by·diffoscope;·len:·293,·SHA:·285c2b30895050fc6db08d569deb905eda14f074f3184a204e001a2aac74deca·...·]-1">)</span><span·class="p">.</span><span·class="w">
351 </span><span·class="p"·data-group-id="7592921365-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7592921365-4">{</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·c[·...·truncated·by·diffoscope;·len:·1360,·SHA:·c4d9190bab85cb23264b15a5f2c58f75724b08f893451e1090069546ce78cec7·...·]-3">}</span></code></pre>351 </span><span·class="p"·data-group-id="9284521522-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9284521522-4">{</span><span·class="mi">128</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·c[·...·truncated·by·diffoscope;·len:·1360,·SHA:·3449f7a33645a9cd7a07a705a82b375ddb6d447a1a32b396b418a4c45e2005dd·...·]-3">}</span></code></pre>
352 ··</section>352 ··</section>
353 </section>353 </section>
354 <section·class="detail"·id="t:carrier_info_list/0">354 <section·class="detail"·id="t:carrier_info_list/0">
  
355 ··<div·class="detail-header">355 ··<div·class="detail-header">
356 ····<a·href="#t:carrier_info_list/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">356 ····<a·href="#t:carrier_info_list/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">
357 ······<i·class="ri-link-m"·aria-hidden="true"></i>357 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 480, 38 lines modifiedOffset 480, 38 lines modified
480 to·an·allocator·of·a·different·type.</p><p>Defaults·to·all·<code·class="inline">alloc_util</code>·allocators.</p></li><li><p><strong><code·class="inline">scheduler_ids</code></strong>·-·The·scheduler·ids·whose·allocator·instances·will·be480 to·an·allocator·of·a·different·type.</p><p>Defaults·to·all·<code·class="inline">alloc_util</code>·allocators.</p></li><li><p><strong><code·class="inline">scheduler_ids</code></strong>·-·The·scheduler·ids·whose·allocator·instances·will·be
481 searched.·A·scheduler·id·of·0·will·refer·to·the·global·instance·that·is·not481 searched.·A·scheduler·id·of·0·will·refer·to·the·global·instance·that·is·not
482 tied·to·any·particular·scheduler.·Defaults·to·all·schedulers·and·the·global482 tied·to·any·particular·scheduler.·Defaults·to·all·schedulers·and·the·global
483 instance.</p></li><li><p><strong><code·class="inline">histogram_start</code></strong>·-·The·upper·bound·of·the·first·interval·in·the·allocated483 instance.</p></li><li><p><strong><code·class="inline">histogram_start</code></strong>·-·The·upper·bound·of·the·first·interval·in·the·allocated
484 block·size·histograms.·Defaults·to·128.</p></li><li><p><strong><code·class="inline">histogram_width</code></strong>·-·The·number·of·intervals·in·the·allocated·block·size484 block·size·histograms.·Defaults·to·128.</p></li><li><p><strong><code·class="inline">histogram_width</code></strong>·-·The·number·of·intervals·in·the·allocated·block·size
485 histograms.·Defaults·to·18.</p></li><li><p><strong><code·class="inline">flags</code></strong>·-·Controls·how·to·group·the·output,·for·example·showing485 histograms.·Defaults·to·18.</p></li><li><p><strong><code·class="inline">flags</code></strong>·-·Controls·how·to·group·the·output,·for·example·showing
486 allocations·on·a·per-process·basis·(when·possible)·rather·than·only·a486 allocations·on·a·per-process·basis·(when·possible)·rather·than·only·a
487 NIF/driver-basis.·Defaults·to·<code·class="inline">[]</code>.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">instrument</span><span·class="p">:</span><span·class="nf">allocations</span><span·class="p"·data-group-id="7058301568-1">(</span><span·class="p"·data-group-id="7058301568-2">#{</span><span·class="w">·</span><span·class="ss">histogram_start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">128</span><span·class="p[·...·truncated·by·diffoscope;·len:·293,·SHA:·2dd5889f9e0905a804fe754ac644f39606719b950a3d3030a46c588da3d849cf·...·]-1">)</span><span·class="p">.</span><span·class="w">487 NIF/driver-basis.·Defaults·to·<code·class="inline">[]</code>.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">instrument</span><span·class="p">:</span><span·class="nf">allocations</span><span·class="p"·data-group-id="8868069781-1">(</span><span·class="p"·data-group-id="8868069781-2">#{</span><span·class="w">·</span><span·class="ss">histogram_start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">128</span><span·class="p[·...·truncated·by·diffoscope;·len:·293,·SHA:·47afa9c082fce61ad7d9bcd6463464ef11cd39e3d734cf3dadb6684a94575bdc·...·]-1">)</span><span·class="p">.</span><span·class="w">
488 </span><span·class="p"·data-group-id="7058301568-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7058301568-4">{</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">488 </span><span·class="p"·data-group-id="8868069781-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8868069781-4">{</span><span·class="mi">128</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
489 ·····</span><span·class="p"·data-group-id="7058301568-5">#{</span><span·class="ss">udp_inet</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">489 ·····</span><span·class="p"·data-group-id="8868069781-5">#{</span><span·class="ss">udp_inet</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
490 ···········</span><span·class="p"·data-group-id="7058301568-6">#{</span><span·class="ss">driver_event_state</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-7">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·743,·SHA:·1af1efbb4c4c7960a1850f49c7b9ed09b97b13687c815c30467e5ffb89948594·...·]-6">}</span><span·class="p">,</span><span·class="w">490 ···········</span><span·class="p"·data-group-id="8868069781-6">#{</span><span·class="ss">driver_event_state</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-7">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·743,·SHA:·79b7678dd9395c4070d398ffe3fa572ea94f78f091762140011c1313706e78ef·...·]-6">}</span><span·class="p">,</span><span·class="w">
491 ·······</span><span·class="ss">system</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">491 ·······</span><span·class="ss">system</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
492 ···········</span><span·class="p"·data-group-id="7058301568-8">#{</span><span·class="ss">heap</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-9">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><s[·...·truncated·by·diffoscope;·len:·677,·SHA:·e57cada80ad0fe12ae01745fb619d859c7972cb5cace62328f52278a33299401·...·]-9">}</span><span·class="p">,</span><span·class="w">492 ···········</span><span·class="p"·data-group-id="8868069781-8">#{</span><span·class="ss">heap</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-9">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><s[·...·truncated·by·diffoscope;·len:·677,·SHA:·57b648544e4356fd3693406390a5f3ef411546e6fe32d20cdc122ff3c9f643f1·...·]-9">}</span><span·class="p">,</span><span·class="w">
493 ·············</span><span·class="ss">db_term</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-10">{</span><span·class="mi">271</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">52</span><span·class="p">,</span><span·class="mi">80</span><span·cl[·...·truncated·by·diffoscope;·len:·523,·SHA:·abb3ed4038654d7b14779094fe89660fce5de37f0a24477216e8bdc0718123c3·...·]-10">}</span><span·class="p">,</span><span·class="w">493 ·············</span><span·class="ss">db_term</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-10">{</span><span·class="mi">271</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">52</span><span·class="p">,</span><span·class="mi">80</span><span·cl[·...·truncated·by·diffoscope;·len:·523,·SHA:·d297f7d48270168e29746ebee596a34b64a29a63a3b19974398a88312e5516ef·...·]-10">}</span><span·class="p">,</span><span·class="w">
494 ·············</span><span·class="ss">code</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-11">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">3</span><span·class=[·...·truncated·by·diffoscope;·len:·524,·SHA:·84944612530d6b54b23a9bc72468022fd6d357d386fd9db468384ee8ac4170ce·...·]-11">}</span><span·class="p">,</span><span·class="w">494 ·············</span><span·class="ss">code</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-11">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">3</span><span·class=[·...·truncated·by·diffoscope;·len:·524,·SHA:·d3b537f4f715545538c8afe35f77438fb6ee86c5b3ae43553f864b48cbf0e4b3·...·]-11">}</span><span·class="p">,</span><span·class="w">
495 ·············</span><span·class="ss">binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-12">{</span><span·class="mi">18</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">7</span><span·class[·...·truncated·by·diffoscope;·len:·520,·SHA:·84f7482d6e53943b460ac2e6c6b8eca5c3a0ca07f6446c02571423e08a2277ab·...·]-12">}</span><span·class="p">,</span><span·class="w">495 ·············</span><span·class="ss">binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-12">{</span><span·class="mi">18</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">7</span><span·class[·...·truncated·by·diffoscope;·len:·520,·SHA:·aefc5c648f02a791e357b5a344608a4ce3e7bcc4f1c115faf8ced61b4b42d8ea·...·]-12">}</span><span·class="p">,</span><span·class="w">
496 ·············</span><span·class="ss">message</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-13">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">40</span><span·class="p">,</span><span·class="mi">78</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">2</span><span·clas[·...·truncated·by·diffoscope;·len:·521,·SHA:·d264abf2ed50594a96292d1f6ca37092ba059173dce5c37271a90e12b76c1eb6·...·]-13">}</span><span·class="p">,</span><span·class="w">496 ·············</span><span·class="ss">message</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-13">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">40</span><span·class="p">,</span><span·class="mi">78</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">2</span><span·clas[·...·truncated·by·diffoscope;·len:·521,·SHA:·94e044503d1a92cba9f297365456f3d1d240b5c65ed1baddbe1bc4422eca1141·...·]-13">}</span><span·class="p">,</span><span·class="w">
497 ·············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-8">}</span><span·class="w">497 ·············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-8">}</span><span·class="w">
498 ·······</span><span·class="ss">spawn_forker</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">498 ·······</span><span·class="ss">spawn_forker</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
499 ···········</span><span·class="p"·data-group-id="7058301568-14">#{</span><span·class="ss">driver_select_data_state</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">499 ···········</span><span·class="p"·data-group-id="8868069781-14">#{</span><span·class="ss">driver_select_data_state</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
500 ·················</span><span·class="p"·data-group-id="7058301568-15">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·573,·SHA:·60bfbb8b1b5af123eaa111363ac43732818418176d7136fd54660ef081d6b8c7·...·]-14">}</span><span·class="p">,</span><span·class="w">500 ·················</span><span·class="p"·data-group-id="8868069781-15">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·573,·SHA:·1599557dff12c1e0fc913a1687ae458f14919853d511e6ea2ed0f1cc82d00b44·...·]-14">}</span><span·class="p">,</span><span·class="w">
501 ·······</span><span·class="ss">ram_file_drv</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-16">#{</span><span·class="ss">drv_binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-17">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0<[·...·truncated·by·diffoscope;·len:·738,·SHA:·ec6a36fc35d344f5bf40cda788b387d70a5caf522f04e58654c35526145d0b38·...·]-16">}</span><span·class="p">,</span><span·class="w">501 ·······</span><span·class="ss">ram_file_drv</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-16">#{</span><span·class="ss">drv_binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-17">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0<[·...·truncated·by·diffoscope;·len:·738,·SHA:·07c184d5e043df8681d6c4af741ab8bf5dc66af859b1832c816bda57a4c78b07·...·]-16">}</span><span·class="p">,</span><span·class="w">
502 ·······</span><span·class="ss">prim_file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">502 ·······</span><span·class="ss">prim_file</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
503 ···········</span><span·class="p"·data-group-id="7058301568-18">#{</span><span·class="ss">process_specific_data</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-19">{</span><span·class="mi">2</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·695,·SHA:·a7d32a7f658295921b1885c1b1b0c6a775643a24cf685f159dd93e545596f279·...·]-19">}</span><span·class="p">,</span><span·class="w">503 ···········</span><span·class="p"·data-group-id="8868069781-18">#{</span><span·class="ss">process_specific_data</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-19">{</span><span·class="mi">2</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·695,·SHA:·81d401d6f6e47a593a06d273ccc80aefe2d47c107870373fbd5b8cc591b0aa89·...·]-19">}</span><span·class="p">,</span><span·class="w">
504 ·············</span><span·class="ss">nif_trap_export_entry</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-20">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·519,·SHA:·f7a76732d0e3d55a0e3a2b5859e1ff29da7a6215a0ae66f2a5735173210d0231·...·]-20">}</span><span·class="p">,</span><span·class="w">504 ·············</span><span·class="ss">nif_trap_export_entry</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-20">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·519,·SHA:·34da736468688d1e66ead4741816b9ff09edf8f4081f15a041e4187a44c65eaf·...·]-20">}</span><span·class="p">,</span><span·class="w">
505 ·············</span><span·class="ss">monitor_extended</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-21">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·519,·SHA:·f7a76732d0e3d55a0e3a2b5859e1ff29da7a6215a0ae66f2a5735173210d0231·...·]-21">}</span><span·class="p">,</span><span·class="w">505 ·············</span><span·class="ss">monitor_extended</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-21">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·519,·SHA:·34da736468688d1e66ead4741816b9ff09edf8f4081f15a041e4187a44c65eaf·...·]-21">}</span><span·class="p">,</span><span·class="w">
506 ·············</span><span·class="ss">drv_binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-22">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·519,·SHA:·223401a53a66d3b38e18f8ca2bb51201918c87014427e99c8ea9b7f9d9eab544·...·]-22">}</span><span·class="p">,</span><span·class="w">506 ·············</span><span·class="ss">drv_binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-22">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·519,·SHA:·e14e78942aac309c59b546bd5e32977c84efd46dddda7e3d024f028cb851f83e·...·]-22">}</span><span·class="p">,</span><span·class="w">
507 ·············</span><span·class="ss">binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-23">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·573,·SHA:·a378f7fe7d671ea1f4ce34c61455c2fe34489e6acb90f49dd2dd2747d0bf1197·...·]-18">}</span><span·class="p">,</span><span·class="w">507 ·············</span><span·class="ss">binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-23">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·573,·SHA:·7926d29370eb48deb483c7217f9afecbb2555cdda837c7a4bbd4791fc608f32f·...·]-18">}</span><span·class="p">,</span><span·class="w">
508 ·······</span><span·class="ss">prim_buffer</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">508 ·······</span><span·class="ss">prim_buffer</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
509 ···········</span><span·class="p"·data-group-id="7058301568-24">#{</span><span·class="ss">nif_internal</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-25">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·686,·SHA:·584c7075d076983a07209b7df6f1e4a43d1e8589590c145664de5b522fefc27f·...·]-25">}</span><span·class="p">,</span><span·class="w">509 ···········</span><span·class="p"·data-group-id="8868069781-24">#{</span><span·class="ss">nif_internal</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-25">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·686,·SHA:·0942726684bd927a25a6c11ce61c17aa455cd165330e4693aad848b60d6a752a·...·]-25">}</span><span·class="p">,</span><span·class="w">
510 ·············</span><span·class="ss">binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7058301568-26">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·733,·SHA:·fceaa20e83f722e7d91efd2a55ec729454a6e7f2e0c6d4608194de6b5ff24406·...·]-3">}</span></code></pre>510 ·············</span><span·class="ss">binary</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8868069781-26">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class=[·...·truncated·by·diffoscope;·len:·733,·SHA:·a3124e3363efd2c02edaeb4c1957b18c2c9bcf846dd2abd74e63ceed6f0c82d6·...·]-3">}</span></code></pre>
511 ··</section>511 ··</section>
512 </section>512 </section>
513 <section·class="detail"·id="carriers/0">513 <section·class="detail"·id="carriers/0">
  
514 ··<div·class="detail-header">514 ··<div·class="detail-header">
515 ····<a·href="#carriers/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">515 ····<a·href="#carriers/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
516 ······<i·class="ri-link-m"·aria-hidden="true"></i>516 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 576, 23 lines modifiedOffset 576, 23 lines modified
576 allocator·type·and·scheduler·id.</p><p>If·the·specified·allocator·types·are·not·enabled,·the·call·will·fail·with576 allocator·type·and·scheduler·id.</p><p>If·the·specified·allocator·types·are·not·enabled,·the·call·will·fail·with
577 <code·class="inline">{error,·not_enabled}</code>.</p><p>The·following·options·can·be·used:</p><ul><li><p><strong><code·class="inline">allocator_types</code></strong>·-·The·allocator·types·that·will·be·searched.·Defaults·to577 <code·class="inline">{error,·not_enabled}</code>.</p><p>The·following·options·can·be·used:</p><ul><li><p><strong><code·class="inline">allocator_types</code></strong>·-·The·allocator·types·that·will·be·searched.·Defaults·to
578 all·<code·class="inline">alloc_util</code>·allocators.</p></li><li><p><strong><code·class="inline">scheduler_ids</code></strong>·-·The·scheduler·ids·whose·allocator·instances·will·be578 all·<code·class="inline">alloc_util</code>·allocators.</p></li><li><p><strong><code·class="inline">scheduler_ids</code></strong>·-·The·scheduler·ids·whose·allocator·instances·will·be
579 searched.·A·scheduler·id·of·0·will·refer·to·the·global·instance·that·is·not579 searched.·A·scheduler·id·of·0·will·refer·to·the·global·instance·that·is·not
580 tied·to·any·particular·scheduler.·Defaults·to·all·schedulers·and·the·global580 tied·to·any·particular·scheduler.·Defaults·to·all·schedulers·and·the·global
581 instance.</p></li><li><p><strong><code·class="inline">histogram_start</code></strong>·-·The·upper·bound·of·the·first·interval·in·the·free581 instance.</p></li><li><p><strong><code·class="inline">histogram_start</code></strong>·-·The·upper·bound·of·the·first·interval·in·the·free
582 block·size·histograms.·Defaults·to·512.</p></li><li><p><strong><code·class="inline">histogram_width</code></strong>·-·The·number·of·intervals·in·the·free·block·size582 block·size·histograms.·Defaults·to·512.</p></li><li><p><strong><code·class="inline">histogram_width</code></strong>·-·The·number·of·intervals·in·the·free·block·size
583 histograms.·Defaults·to·14.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">instrument</span><span·class="p">:</span><span·class="nf">carriers</span><span·class="p"·data-group-id="8329628944-1">(</span><span·class="p"·data-group-id="8329628944-2">#{</span><span·class="w">·</span><span·class="ss">histogram_start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">512</span><span·class="p[·...·truncated·by·diffoscope;·len:·292,·SHA:·96364a546f7b349e239adefbbbf128d296f75f234a96f3aab7d36a588624fb7d·...·]-1">)</span><span·class="p">.</span><span·class="w">583 histograms.·Defaults·to·14.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">instrument</span><span·class="p">:</span><span·class="nf">carriers</span><span·class="p"·data-group-id="2145418922-1">(</span><span·class="p"·data-group-id="2145418922-2">#{</span><span·class="w">·</span><span·class="ss">histogram_start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">512</span><span·class="p[·...·truncated·by·diffoscope;·len:·292,·SHA:·080e510d7340ac6ea63abc7bacfe3085b2134bce2a961e29d28e2ab5018e6987·...·]-1">)</span><span·class="p">.</span><span·class="w">
584 </span><span·class="p"·data-group-id="8329628944-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8329628944-4">{</span><span·class="mi">512</span><span·class="p">,</span><span·class="w">584 </span><span·class="p"·data-group-id="2145418922-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2145418922-4">{</span><span·class="mi">512</span><span·class="p">,</span><span·class="w">
585 ·····</span><span·class="p"·data-group-id="8329628944-5">[</span><span·class="p"·data-group-id="8329628944-6">{</span><span·class="ss">driver_alloc</span><span·class="p">,</span><span·class="ss">false</span><span·class="p">,</span><span·class="mi">262144</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">585 ·····</span><span·class="p"·data-group-id="2145418922-5">[</span><span·class="p"·data-group-id="2145418922-6">{</span><span·class="ss">driver_alloc</span><span·class="p">,</span><span·class="ss">false</span><span·class="p">,</span><span·class="mi">262144</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
586 ····················</span><span·class="p"·data-group-id="8329628944-7">[</span><span·class="p"·data-group-id="8329628944-8">{</span><span·class="ss">driver_alloc</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">32784</span><span·class="p"·data-group-id="8329628944-8[·...·truncated·by·diffoscope;·len:·51,·SHA:·dbc8c4a7a222ca6497a5ad34e920971e0b082c23fc5c3c3599b83d183a924875·...·]-7">]</span><span·class="p">,</span><span·class="w">586 ····················</span><span·class="p"·data-group-id="2145418922-7">[</span><span·class="p"·data-group-id="2145418922-8">{</span><span·class="ss">driver_alloc</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">32784</span><span·class="p"·data-group-id="2145418922-8[·...·truncated·by·diffoscope;·len:·51,·SHA:·2958a7f671cae72e84e49bfb757e01d6b64b4b0a4fd96bbfb6279d1ff7efae38·...·]-7">]</span><span·class="p">,</span><span·class="w">
587 ····················</span><span·class="p"·data-group-id="8329628944-9">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·228,·SHA:·32e0127da4727e7daa926050acdaa0b064a46969939b473507651ad1a5ae42de·...·]-6">}</span><span·class="p">,</span><span·class="w">587 ····················</span><span·class="p"·data-group-id="2145418922-9">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·228,·SHA:·8cb2a6f4b642c3db04da38fdbf9546963fac24f7d499e4b72758bc07a72c389f·...·]-6">}</span><span·class="p">,</span><span·class="w">
588 ······</span><span·class="p"·data-group-id="8329628944-10">{</span><span·class="ss">binary_alloc</span><span·class="p">,</span><span·class="ss">false</span><span·class="p">,</span><span·class="mi">32768</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">588 ······</span><span·class="p"·data-group-id="2145418922-10">{</span><span·class="ss">binary_alloc</span><span·class="p">,</span><span·class="ss">false</span><span·class="p">,</span><span·class="mi">32768</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
589 ····················</span><span·class="p"·data-group-id="8329628944-11">[</span><span·class="p"·data-group-id="8329628944-12">{</span><span·class="ss">binary_alloc</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">4304</span><span·class="p"·data-group-id="8329628944[·...·truncated·by·diffoscope;·len:·54,·SHA:·e9e2e431f65769fa199ee92ccc985133a9b50ea90f15cee9e635e17e005f844f·...·]-11">]</span><span·class="p">,</span><span·class="w">589 ····················</span><span·class="p"·data-group-id="2145418922-11">[</span><span·class="p"·data-group-id="2145418922-12">{</span><span·class="ss">binary_alloc</span><span·class="p">,</span><span·class="mi">15</span><span·class="p">,</span><span·class="mi">4304</span><span·class="p"·data-group-id="2145418922[·...·truncated·by·diffoscope;·len:·54,·SHA:·dfed90d1e9892abeae3a6c3c258210540fb38323c4ba7d020507ac3bf5f57247·...·]-11">]</span><span·class="p">,</span><span·class="w">
590 ····················</span><span·class="p"·data-group-id="8329628944-13">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class=[·...·truncated·by·diffoscope;·len:·230,·SHA:·65885a21d1782d075f58ab52c696788eeb207cd7c5ba8208cd2fa3fddb3ecff0·...·]-10">}</span><span·class="p">,</span><span·class="w">590 ····················</span><span·class="p"·data-group-id="2145418922-13">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class=[·...·truncated·by·diffoscope;·len:·230,·SHA:·9d5943328aa7a255cd853fda4daba280e04989c09a9b524d0fed42d237d3210b·...·]-10">}</span><span·class="p">,</span><span·class="w">
591 ······</span><span·class="p"·data-group-id="8329628944-14">{</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="8329628944-14">}</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class[·...·truncated·by·diffoscope;·len:·136,·SHA:·0d3a5627176fce58b9d599f6a2daa0d6fed4eb711d7ef6df33650ad2a7b87472·...·]-3">}</span></code></pre>591 ······</span><span·class="p"·data-group-id="2145418922-14">{</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2145418922-14">}</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class[·...·truncated·by·diffoscope;·len:·136,·SHA:·b94847f5e1e8512fba4d63fb7b952b8b873c29ba7d189e2c1b9cdae4a220e7ad·...·]-3">}</span></code></pre>
592 ··</section>592 ··</section>
593 </section>593 </section>
  
594 ····</div>594 ····</div>
595 ··</section>595 ··</section>
  
596 ····<footer·class="footer">596 ····<footer·class="footer">
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613 ······<p·class="built-using">613 ······<p·class="built-using">
614 ········Built·using614 ········Built·using
615 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the615 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
616 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>616 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
617 ······</p>617 ······</p>
618 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>618 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
619 ····</footer>619 ····</footer>
620 ··</div>620 ··</div>
621 </main>621 </main>
622 </div>622 </div>
623 <script>623 <script>
624 ··function·mermaidLoaded()·{624 ··function·mermaidLoaded()·{
625 ····mermaid.initialize({625 ····mermaid.initialize({
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146 $·make</code></pre><h2·id="dyntrace-tracepoints"·class="section-heading">146 $·make</code></pre><h2·id="dyntrace-tracepoints"·class="section-heading">
147 ··<a·href="#dyntrace-tracepoints"·class="hover-link">147 ··<a·href="#dyntrace-tracepoints"·class="hover-link">
148 ····<i·class="ri-link-m"·aria-hidden="true"></i>148 ····<i·class="ri-link-m"·aria-hidden="true"></i>
149 ··</a>149 ··</a>
150 ··<span·class="text">Dyntrace·Tracepoints</span>150 ··<span·class="text">Dyntrace·Tracepoints</span>
151 </h2>151 </h2>
152 <p>All·tracepoints·are·in·the·domain·of·<code·class="inline">org_erlang_dyntrace</code></p><p>All·Erlang·types·are·the·string·equivalent·in·LTTng.</p><p><em>process_spawn</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">parent·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">procs</code>·and152 <p>All·tracepoints·are·in·the·domain·of·<code·class="inline">org_erlang_dyntrace</code></p><p>All·Erlang·types·are·the·string·equivalent·in·LTTng.</p><p><em>process_spawn</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">parent·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">procs</code>·and
153 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">process_spawn</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="7403264071-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">3</span><span·class="w">·</span><span·class="p"·data-group-id="7403264071-1">}</span><span·[·...·truncated·by·diffoscope;·len:·730,·SHA:·400ef63da018ea194b909bbf0540b60eefb77c25846a4390fa9af7ed304a50da·...·]1-2">}</span></code></pre><p><em>process_link</em></p><ul><li><code·class="inline">to·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">from·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><p><code·class="inline">type·:·string</code>·::·<code·class="inline">&quot;link&quot;·|·&quot;unlink&quot;</code></p></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">procs</code>·and153 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">process_spawn</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9631663701-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">3</span><span·class="w">·</span><span·class="p"·data-group-id="9631663701-1">}</span><span·[·...·truncated·by·diffoscope;·len:·730,·SHA:·c18e478442a636f43d79c6080a6ffa54aa56ca1624c2ff34ea410a66d6626865·...·]1-2">}</span></code></pre><p><em>process_link</em></p><ul><li><code·class="inline">to·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">from·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><p><code·class="inline">type·:·string</code>·::·<code·class="inline">&quot;link&quot;·|·&quot;unlink&quot;</code></p></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">procs</code>·and
154 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">process_link:·{·cpu_id·=·3·},·{·from·=·&quot;&lt;0.130.0&gt;&quot;,·to·=·&quot;&lt;0.131.0&gt;&quot;,·type·=·&quot;link&quot;·}</code></pre><p><em>process_exit</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">reason·:·string</code>·::·Exit·reason.·Ex.·<code·class="inline">&quot;normal&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">procs</code>·and154 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">process_link:·{·cpu_id·=·3·},·{·from·=·&quot;&lt;0.130.0&gt;&quot;,·to·=·&quot;&lt;0.131.0&gt;&quot;,·type·=·&quot;link&quot;·}</code></pre><p><em>process_exit</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">reason·:·string</code>·::·Exit·reason.·Ex.·<code·class="inline">&quot;normal&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">procs</code>·and
155 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">process_exit:·{·cpu_id·=·3·},·{·pid·=·&quot;&lt;0.130.0&gt;&quot;,·reason·=·&quot;normal&quot;·}</code></pre><p><em>process_register</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">name·:·string</code>·::·Registered·name.·Ex.·<code·class="inline">&quot;logger&quot;</code></li><li><p><code·class="inline">type·:·string</code>·::·<code·class="inline">&quot;register&quot;·|·&quot;unregister&quot;</code></p></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">process_register</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="7470546396-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="7470546396-1">}</span><span·c[·...·truncated·by·diffoscope;·len:·702,·SHA:·5250507b3b68277732574d281771a33e4f78ce803e3d68b42204902140ba2573·...·]-2">}</span></code></pre><p><em>process_scheduled</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">type·:·string</code>·::155 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">process_exit:·{·cpu_id·=·3·},·{·pid·=·&quot;&lt;0.130.0&gt;&quot;,·reason·=·&quot;normal&quot;·}</code></pre><p><em>process_register</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">name·:·string</code>·::·Registered·name.·Ex.·<code·class="inline">&quot;logger&quot;</code></li><li><p><code·class="inline">type·:·string</code>·::·<code·class="inline">&quot;register&quot;·|·&quot;unregister&quot;</code></p></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">process_register</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="7179242755-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="7179242755-1">}</span><span·c[·...·truncated·by·diffoscope;·len:·702,·SHA:·03cead3893dd4c94e6c5c4eaf1797fa83c7e85889667ba71f1336869b98654a4·...·]-2">}</span></code></pre><p><em>process_scheduled</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">type·:·string</code>·::
156 <code·class="inline">&quot;in&quot;·|·&quot;out&quot;·|·&quot;in_exiting&quot;·|·&quot;out_exiting&quot;·|·&quot;out_exited&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">running</code>·and156 <code·class="inline">&quot;in&quot;·|·&quot;out&quot;·|·&quot;in_exiting&quot;·|·&quot;out_exiting&quot;·|·&quot;out_exited&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">running</code>·and
157 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">process_scheduled</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="3392141733-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="3392141733-1">}</span><span·[·...·truncated·by·diffoscope;·len:·716,·SHA:·7d796cee4554b424b6a834f4a33986b235e00a81f3f83139c31a77a9b4eec10c·...·]-2">}</span></code></pre><p><em>port_open</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">driver·:·string</code>·::·Driver·name.·Ex.·<code·class="inline">&quot;tcp_inet&quot;</code></li><li><code·class="inline">port·:·string</code>·::·Port·ID.·Ex.·<code·class="inline">&quot;#Port&lt;0.1031&gt;&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">ports</code>·and157 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">process_scheduled</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="5378277630-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="5378277630-1">}</span><span·[·...·truncated·by·diffoscope;·len:·716,·SHA:·d1c7e4065bf80fdfa79248c366ec68f4a7a3cd06006b4a295ccb1a63865f225d·...·]-2">}</span></code></pre><p><em>port_open</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">driver·:·string</code>·::·Driver·name.·Ex.·<code·class="inline">&quot;tcp_inet&quot;</code></li><li><code·class="inline">port·:·string</code>·::·Port·ID.·Ex.·<code·class="inline">&quot;#Port&lt;0.1031&gt;&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">ports</code>·and
158 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">port_open:·{·cpu_id·=·5·},·{·pid·=·&quot;&lt;0.131.0&gt;&quot;,·driver·=·&quot;'/bin/sh·-s·unix:cmd'&quot;,·port·=·&quot;#Port&lt;0.1887&gt;&quot;·}</code></pre><p><em>port_exit</em></p><ul><li><code·class="inline">port·:·string</code>·::·Port·ID.·Ex.·<code·class="inline">&quot;#Port&lt;0.1031&gt;&quot;</code></li><li><code·class="inline">reason·:·string</code>·::·Exit·reason.·Ex.·<code·class="inline">&quot;normal&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">ports</code>·and158 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">port_open:·{·cpu_id·=·5·},·{·pid·=·&quot;&lt;0.131.0&gt;&quot;,·driver·=·&quot;'/bin/sh·-s·unix:cmd'&quot;,·port·=·&quot;#Port&lt;0.1887&gt;&quot;·}</code></pre><p><em>port_exit</em></p><ul><li><code·class="inline">port·:·string</code>·::·Port·ID.·Ex.·<code·class="inline">&quot;#Port&lt;0.1031&gt;&quot;</code></li><li><code·class="inline">reason·:·string</code>·::·Exit·reason.·Ex.·<code·class="inline">&quot;normal&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">ports</code>·and
159 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">port_exit:·{·cpu_id·=·5·},·{·port·=·&quot;#Port&lt;0.1887&gt;&quot;,·reason·=·&quot;normal&quot;·}</code></pre><p><em>port_link</em></p><ul><li><code·class="inline">to·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">from·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><p><code·class="inline">type·:·string</code>·::·<code·class="inline">&quot;link&quot;·|·&quot;unlink&quot;</code></p></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">ports</code>·and159 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">port_exit:·{·cpu_id·=·5·},·{·port·=·&quot;#Port&lt;0.1887&gt;&quot;,·reason·=·&quot;normal&quot;·}</code></pre><p><em>port_link</em></p><ul><li><code·class="inline">to·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">from·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><p><code·class="inline">type·:·string</code>·::·<code·class="inline">&quot;link&quot;·|·&quot;unlink&quot;</code></p></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">ports</code>·and
160 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">port_link</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4096272025-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="4096272025-1">}</span><span·[·...·truncated·by·diffoscope;·len:·723,·SHA:·51e2d038e6cf865a5ba2a3ed6ecc64575de228ccc8482491fa86413a822ab3c3·...·]-2">}</span></code></pre><p><em>port_scheduled</em></p><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">running</code>·and160 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">port_link</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9142079243-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="9142079243-1">}</span><span·[·...·truncated·by·diffoscope;·len:·723,·SHA:·e020ba20d06c575e23828b46547aea9866fc0d2da42514ed20855ae282f11f7e·...·]-2">}</span></code></pre><p><em>port_scheduled</em></p><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">running</code>·and
161 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><ul><li><code·class="inline">port·:·string</code>·::·Port·ID.·Ex.·<code·class="inline">&quot;#Port&lt;0.1031&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Callback.·Ex.·<code·class="inline">&quot;open&quot;</code></li><li><code·class="inline">type·:·string</code>·::161 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><ul><li><code·class="inline">port·:·string</code>·::·Port·ID.·Ex.·<code·class="inline">&quot;#Port&lt;0.1031&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Callback.·Ex.·<code·class="inline">&quot;open&quot;</code></li><li><code·class="inline">type·:·string</code>·::
162 <code·class="inline">&quot;in&quot;·|·&quot;out&quot;·|·&quot;in_exiting&quot;·|·&quot;out_exiting&quot;·|·&quot;out_exited&quot;</code></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">port_scheduled</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="6167522881-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="6167522881-1">}</span><span·[·...·truncated·by·diffoscope;·len:·712,·SHA:·ae881cf38bd9361ed7938360e8b3f30eddabbd9ce9d15ff398babace4c9e0b78·...·]-2">}</span></code></pre><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">running</code>·and162 <code·class="inline">&quot;in&quot;·|·&quot;out&quot;·|·&quot;in_exiting&quot;·|·&quot;out_exiting&quot;·|·&quot;out_exited&quot;</code></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">port_scheduled</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9152645900-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="9152645900-1">}</span><span·[·...·truncated·by·diffoscope;·len:·712,·SHA:·9216bc4ff83992923b36a757e69512fb05b4807005db433444ed1845c70737f0·...·]-2">}</span></code></pre><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">running</code>·and
163 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p><em>function_call</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">depth·:·integer</code>·::·Stack·depth.·Ex.·<code·class="inline">0</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">call</code>·and163 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p><em>function_call</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">depth·:·integer</code>·::·Stack·depth.·Ex.·<code·class="inline">0</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">call</code>·and
164 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">function_call</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="4095916915-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="4095916915-1">}</span><span·[·...·truncated·by·diffoscope;·len:·740,·SHA:·8a56ec18c6ba126f71d47f7375087d3a8c2057a744156987d031a1c073544c75·...·]-2">}</span></code></pre><p><em>function_return</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">depth·:·integer</code>·::·Stack·depth.·Ex.·<code·class="inline">0</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">call</code>·or·<code·class="inline">return_to</code>·and164 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">function_call</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1681180969-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="1681180969-1">}</span><span·[·...·truncated·by·diffoscope;·len:·740,·SHA:·75ccaace867175edabb20b3e015ce209845be5053a7cf65b51425e8d1263eba0·...·]-2">}</span></code></pre><p><em>function_return</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">depth·:·integer</code>·::·Stack·depth.·Ex.·<code·class="inline">0</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">call</code>·or·<code·class="inline">return_to</code>·and
165 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">function_return</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="9809321827-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="9809321827-1">}</span><span·[·...·truncated·by·diffoscope;·len:·720,·SHA:·208ec5649636f2d1fe0221ffe5630e3ace92cc7eb06ef830bf9eef90f3589654·...·]-2">}</span></code></pre><p><em>function_exception</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">class·:·string</code>·::·Error·reason.·Ex.·<code·class="inline">&quot;error&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">call</code>·and165 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">function_return</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="0414380205-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="0414380205-1">}</span><span·[·...·truncated·by·diffoscope;·len:·720,·SHA:·e820f9f92a02a584d0c624834f29bb29597c845014a106694cc952d588db631f·...·]-2">}</span></code></pre><p><em>function_exception</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">entry·:·string</code>·::·Code·Location.·Ex.·<code·class="inline">&quot;lists:sort/1&quot;</code></li><li><code·class="inline">class·:·string</code>·::·Error·reason.·Ex.·<code·class="inline">&quot;error&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">call</code>·and
166 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">function_exception</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="2014094754-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="2014094754-1">}</span><span·[·...·truncated·by·diffoscope;·len:·718,·SHA:·61403c4505609246dd40263224c0afdacfee53cdde5352b485a60b4789c89201·...·]-2">}</span></code></pre><p><em>message_send</em></p><ul><li><code·class="inline">from·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">to·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">message·:·string</code>·::·Message·sent.·Ex.·<code·class="inline">&quot;{&lt;0.162.0&gt;,ok}&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">send</code>·and166 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">function_exception</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8515691836-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5</span><span·class="w">·</span><span·class="p"·data-group-id="8515691836-1">}</span><span·[·...·truncated·by·diffoscope;·len:·718,·SHA:·bf1e50370b833bc5592cc5ae9ec6a64a8f1b26c8ee8a208cc155544bfca345c2·...·]-2">}</span></code></pre><p><em>message_send</em></p><ul><li><code·class="inline">from·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">to·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">message·:·string</code>·::·Message·sent.·Ex.·<code·class="inline">&quot;{&lt;0.162.0&gt;,ok}&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">send</code>·and
167 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">message_send:·{·cpu_id·=·3·},·{·from·=·&quot;#Port&lt;0.1938&gt;&quot;,·to·=·&quot;&lt;0.160.0&gt;&quot;,·message·=·&quot;{#Port&lt;0.1938&gt;,eof}&quot;·}</code></pre><p><em>message_receive</em></p><ul><li><code·class="inline">to·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">message·:·string</code>·::·Message·received.·Ex.·<code·class="inline">&quot;{&lt;0.162.0&gt;,ok}&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">'receive'</code>·and167 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">message_send:·{·cpu_id·=·3·},·{·from·=·&quot;#Port&lt;0.1938&gt;&quot;,·to·=·&quot;&lt;0.160.0&gt;&quot;,·message·=·&quot;{#Port&lt;0.1938&gt;,eof}&quot;·}</code></pre><p><em>message_receive</em></p><ul><li><code·class="inline">to·:·string</code>·::·Process·ID·or·Port·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">message·:·string</code>·::·Message·received.·Ex.·<code·class="inline">&quot;{&lt;0.162.0&gt;,ok}&quot;</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">'receive'</code>·and
168 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">message_receive:·{·cpu_id·=·7·},·{·to·=·&quot;&lt;0.167.0&gt;&quot;,·message·=·&quot;{&lt;0.165.0&gt;,ok}&quot;·}</code></pre><p><em>gc_minor_start</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">need·:·integer</code>·::·Heap·need.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and168 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">message_receive:·{·cpu_id·=·7·},·{·to·=·&quot;&lt;0.167.0&gt;&quot;,·message·=·&quot;{&lt;0.165.0&gt;,ok}&quot;·}</code></pre><p><em>gc_minor_start</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">need·:·integer</code>·::·Heap·need.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and
169 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gc_minor_start</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="1304821011-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="1304821011-1">}</span><span·[·...·truncated·by·diffoscope;·len:·858,·SHA:·3f545be1c60231baad8d987d11460a816fe92094760bb917cb8822ba439ed5af·...·]-2">}</span></code></pre><p><em>gc_minor_end</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">reclaimed·:·integer</code>·::·Heap·reclaimed.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and169 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gc_minor_start</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="8785155967-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="8785155967-1">}</span><span·[·...·truncated·by·diffoscope;·len:·858,·SHA:·7454932461ee2aadf52d60c417502d6bf7f0c2a0cb8d207f6bfe9c42dde67c9a·...·]-2">}</span></code></pre><p><em>gc_minor_end</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">reclaimed·:·integer</code>·::·Heap·reclaimed.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and
170 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="c">gc_minor_end:·{·cpu_id·=·0·},·{·pid·=·&quot;&lt;0.172.0&gt;&quot;,·reclaimed·=·120,·heap·=·1598,·old_heap·=·1598·}</code></pre><p><em>gc_major_start</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">need·:·integer</code>·::·Heap·need.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and170 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="c">gc_minor_end:·{·cpu_id·=·0·},·{·pid·=·&quot;&lt;0.172.0&gt;&quot;,·reclaimed·=·120,·heap·=·1598,·old_heap·=·1598·}</code></pre><p><em>gc_major_start</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">need·:·integer</code>·::·Heap·need.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and
171 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gc_major_start</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="2303446440-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="2303446440-1">}</span><span·[·...·truncated·by·diffoscope;·len:·861,·SHA:·2aa87412861fd262093cc92dd25ffb47754dd168e4343e66fd2179607b3c54f5·...·]0-2">}</span></code></pre><p><em>gc_major_end</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">reclaimed·:·integer</code>·::·Heap·reclaimed.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and171 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">gc_major_start</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="3235618180-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="3235618180-1">}</span><span·[·...·truncated·by·diffoscope;·len:·861,·SHA:·222d8106feb9880432116087698cf8cef4fc15b2bc972de135b7508ab6b46250·...·]0-2">}</span></code></pre><p><em>gc_major_end</em></p><ul><li><code·class="inline">pid·:·string</code>·::·Process·ID.·Ex.·<code·class="inline">&quot;&lt;0.131.0&gt;&quot;</code></li><li><code·class="inline">reclaimed·:·integer</code>·::·Heap·reclaimed.·Ex.·<code·class="inline">2</code></li><li><code·class="inline">heap·:·integer</code>·::·Young·heap·word·size.·Ex.·<code·class="inline">233</code></li><li><code·class="inline">old_heap·:·integer</code>·::·Old·heap·word·size.·Ex.·<code·class="inline">233</code></li></ul><p>Available·through·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#trace/3"><code·class="inline">erlang:trace/3</code></a>·with·trace·flag·<code·class="inline">garbage_collection</code>·and
172 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">gc_major_end:·{·cpu_id·=·0·},·{·pid·=·&quot;&lt;0.172.0&gt;&quot;,·reclaimed·=·240,·heap·=·4185,·old_heap·=·0·}</code></pre><h2·id="beam-tracepoints"·class="section-heading">172 <code·class="inline">{tracer,dyntrace,[]}</code>·as·tracer·module.</p><p>Example:</p><pre><code·class="text">gc_major_end:·{·cpu_id·=·0·},·{·pid·=·&quot;&lt;0.172.0&gt;&quot;,·reclaimed·=·240,·heap·=·4185,·old_heap·=·0·}</code></pre><h2·id="beam-tracepoints"·class="section-heading">
173 ··<a·href="#beam-tracepoints"·class="hover-link">173 ··<a·href="#beam-tracepoints"·class="hover-link">
174 ····<i·class="ri-link-m"·aria-hidden="true"></i>174 ····<i·class="ri-link-m"·aria-hidden="true"></i>
175 ··</a>175 ··</a>
176 ··<span·class="text">BEAM·Tracepoints</span>176 ··<span·class="text">BEAM·Tracepoints</span>
177 </h2>177 </h2>
178 <p>All·tracepoints·are·in·the·domain·of·<code·class="inline">org_erlang_otp</code></p><p>All·Erlang·types·are·the·string·equivalent·in·LTTng.</p><p><em>driver_init</em></p><ul><li><code·class="inline">driver·:·string</code>·::·Driver·name.·Ex.·<code·class="inline">&quot;tcp_inet&quot;</code></li><li><code·class="inline">major·:·integer</code>·::·Major·version.·Ex.·<code·class="inline">3</code></li><li><code·class="inline">minor·:·integer</code>·::·Minor·version.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">flags·:·integer</code>·::·Flags.·Ex.·<code·class="inline">1</code></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">driver_init</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="3234977547-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="p"·data-group-id="3234977547-1">}</span><span·c[·...·truncated·by·diffoscope;·len:·19388,·SHA:·fa062692ac849ed097000cddd136a41da617dd3c5209b4e70e4c40c0af36a105·...·]-2">}</span></code></pre><p><em>carrier_create</em></p><ul><li><code·class="inline">type·:·string</code>·::·Carrier·type.·Ex.·<code·class="inline">&quot;ets_alloc&quot;</code></li><li><code·class="inline">instance·:·integer</code>·::·Allocator·instance.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">size·:·integer</code>·::·Carrier·size.·Ex.·<code·class="inline">262144</code></li><li><code·class="inline">mbc_carriers·:·integer</code>·::·Number·of·multiblock·carriers·in·instance.·Ex.·<code·class="inline">3</code></li><li><code·class="inline">mbc_carriers_size·:·integer</code>·::·Total·size·of·multiblock·blocks·carriers·in178 <p>All·tracepoints·are·in·the·domain·of·<code·class="inline">org_erlang_otp</code></p><p>All·Erlang·types·are·the·string·equivalent·in·LTTng.</p><p><em>driver_init</em></p><ul><li><code·class="inline">driver·:·string</code>·::·Driver·name.·Ex.·<code·class="inline">&quot;tcp_inet&quot;</code></li><li><code·class="inline">major·:·integer</code>·::·Major·version.·Ex.·<code·class="inline">3</code></li><li><code·class="inline">minor·:·integer</code>·::·Minor·version.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">flags·:·integer</code>·::·Flags.·Ex.·<code·class="inline">1</code></li></ul><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">driver_init</span><span·class="p">:</span><span·class="w">·</span><span·class="p"·data-group-id="3949589621-1">{</span><span·class="w">·</span><span·class="ss">cpu_id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">2</span><span·class="w">·</span><span·class="p"·data-group-id="3949589621-1">}</span><span·c[·...·truncated·by·diffoscope;·len:·19388,·SHA:·c128476789e4f833aee0971e62c7b0f9fc8225f81d36ccec8aecde4e038efe16·...·]-2">}</span></code></pre><p><em>carrier_create</em></p><ul><li><code·class="inline">type·:·string</code>·::·Carrier·type.·Ex.·<code·class="inline">&quot;ets_alloc&quot;</code></li><li><code·class="inline">instance·:·integer</code>·::·Allocator·instance.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">size·:·integer</code>·::·Carrier·size.·Ex.·<code·class="inline">262144</code></li><li><code·class="inline">mbc_carriers·:·integer</code>·::·Number·of·multiblock·carriers·in·instance.·Ex.·<code·class="inline">3</code></li><li><code·class="inline">mbc_carriers_size·:·integer</code>·::·Total·size·of·multiblock·blocks·carriers·in
179 instance.·Ex.·<code·class="inline">1343488</code></li><li><code·class="inline">mbc_blocks·:·integer</code>·::·Number·of·multiblock·blocks·in·instance.·Ex.·<code·class="inline">122</code></li><li><code·class="inline">mbc_blocks_size·:·integer</code>·::·Total·size·of·all·multiblock·blocks·in179 instance.·Ex.·<code·class="inline">1343488</code></li><li><code·class="inline">mbc_blocks·:·integer</code>·::·Number·of·multiblock·blocks·in·instance.·Ex.·<code·class="inline">122</code></li><li><code·class="inline">mbc_blocks_size·:·integer</code>·::·Total·size·of·all·multiblock·blocks·in
180 instance.·Ex.·<code·class="inline">285296</code></li><li><code·class="inline">sbc_carriers·:·integer</code>·::·Number·of·singleblock·carriers·in·instance.·Ex.180 instance.·Ex.·<code·class="inline">285296</code></li><li><code·class="inline">sbc_carriers·:·integer</code>·::·Number·of·singleblock·carriers·in·instance.·Ex.
181 <code·class="inline">1</code></li><li><code·class="inline">sbc_carriers_size·:·integer</code>·::·Total·size·of·singleblock·blocks·carriers·in181 <code·class="inline">1</code></li><li><code·class="inline">sbc_carriers_size·:·integer</code>·::·Total·size·of·singleblock·blocks·carriers·in
182 instance.·Ex.·<code·class="inline">1343488</code></li><li><code·class="inline">sbc_blocks·:·integer</code>·::·Number·of·singleblocks·in·instance.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">sbc_blocks_size·:·integer</code>·::·Total·size·of·all·singleblock·blocks·in182 instance.·Ex.·<code·class="inline">1343488</code></li><li><code·class="inline">sbc_blocks·:·integer</code>·::·Number·of·singleblocks·in·instance.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">sbc_blocks_size·:·integer</code>·::·Total·size·of·all·singleblock·blocks·in
183 instance.·Ex.·<code·class="inline">285296</code></li></ul><p>Example:</p><pre><code·class="c">carrier_create:·{·cpu_id·=·2·},·{·type·=·&quot;ets_alloc&quot;,·instance·=·7,·size·=·2097152,·mbc_carriers·=·4,·mbc_carriers_size·=·3440640,·mbc_blocks·=·526,·mbc_blocks_size·=·1278576,·sbc_carriers·=·0,·sbc_carriers_size·=·0,·sbc_blocks·=·0,·sbc_blocks_size·=·0·}</code></pre><p><em>carrier_destroy</em></p><ul><li><code·class="inline">type·:·string</code>·::·Carrier·type.·Ex.·<code·class="inline">&quot;ets_alloc&quot;</code></li><li><code·class="inline">instance·:·integer</code>·::·Allocator·instance.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">size·:·integer</code>·::·Carrier·size.·Ex.·<code·class="inline">262144</code></li><li><code·class="inline">mbc_carriers·:·integer</code>·::·Number·of·multiblock·carriers·in·instance.·Ex.·<code·class="inline">3</code></li><li><code·class="inline">mbc_carriers_size·:·integer</code>·::·Total·size·of·multiblock·blocks·carriers·in183 instance.·Ex.·<code·class="inline">285296</code></li></ul><p>Example:</p><pre><code·class="c">carrier_create:·{·cpu_id·=·2·},·{·type·=·&quot;ets_alloc&quot;,·instance·=·7,·size·=·2097152,·mbc_carriers·=·4,·mbc_carriers_size·=·3440640,·mbc_blocks·=·526,·mbc_blocks_size·=·1278576,·sbc_carriers·=·0,·sbc_carriers_size·=·0,·sbc_blocks·=·0,·sbc_blocks_size·=·0·}</code></pre><p><em>carrier_destroy</em></p><ul><li><code·class="inline">type·:·string</code>·::·Carrier·type.·Ex.·<code·class="inline">&quot;ets_alloc&quot;</code></li><li><code·class="inline">instance·:·integer</code>·::·Allocator·instance.·Ex.·<code·class="inline">1</code></li><li><code·class="inline">size·:·integer</code>·::·Carrier·size.·Ex.·<code·class="inline">262144</code></li><li><code·class="inline">mbc_carriers·:·integer</code>·::·Number·of·multiblock·carriers·in·instance.·Ex.·<code·class="inline">3</code></li><li><code·class="inline">mbc_carriers_size·:·integer</code>·::·Total·size·of·multiblock·blocks·carriers·in
184 instance.·Ex.·<code·class="inline">1343488</code></li><li><code·class="inline">mbc_blocks·:·integer</code>·::·Number·of·multiblock·blocks·in·instance.·Ex.·<code·class="inline">122</code></li><li><code·class="inline">mbc_blocks_size·:·integer</code>·::·Total·size·of·all·multiblock·blocks·in184 instance.·Ex.·<code·class="inline">1343488</code></li><li><code·class="inline">mbc_blocks·:·integer</code>·::·Number·of·multiblock·blocks·in·instance.·Ex.·<code·class="inline">122</code></li><li><code·class="inline">mbc_blocks_size·:·integer</code>·::·Total·size·of·all·multiblock·blocks·in
185 instance.·Ex.·<code·class="inline">285296</code></li><li><code·class="inline">sbc_carriers·:·integer</code>·::·Number·of·singleblock·carriers·in·instance.·Ex.185 instance.·Ex.·<code·class="inline">285296</code></li><li><code·class="inline">sbc_carriers·:·integer</code>·::·Number·of·singleblock·carriers·in·instance.·Ex.
Offset 194, 18 lines modifiedOffset 194, 18 lines modified
194 <p>An·example·of·process·tracing·of·<code·class="inline">os_mon</code>·and·friends.</p><p>Clean·start·of·lttng·in·a·bash·shell.</p><pre><code·class="text">$·lttng·create·erlang-demo194 <p>An·example·of·process·tracing·of·<code·class="inline">os_mon</code>·and·friends.</p><p>Clean·start·of·lttng·in·a·bash·shell.</p><pre><code·class="text">$·lttng·create·erlang-demo
195 Spawning·a·session·daemon195 Spawning·a·session·daemon
196 Session·erlang-demo·created.196 Session·erlang-demo·created.
197 Traces·will·be·written·in·/home/egil/lttng-traces/erlang-demo-20160526-165920</code></pre><p>Start·an·Erlang·node·with·lttng·enabled.</p><pre><code·class="text">$·erl197 Traces·will·be·written·in·/home/egil/lttng-traces/erlang-demo-20160526-165920</code></pre><p>Start·an·Erlang·node·with·lttng·enabled.</p><pre><code·class="text">$·erl
198 Erlang/OTP·19·[erts-8.0]·[source-4d7b24d]·[64-bit]·[smp:8:8]·[async-threads:10]·[hipe]·[kernel-poll:false]·[lttng]198 Erlang/OTP·19·[erts-8.0]·[source-4d7b24d]·[64-bit]·[smp:8:8]·[async-threads:10]·[hipe]·[kernel-poll:false]·[lttng]
  
199 Eshell·V8.0··(abort·with·^G)199 Eshell·V8.0··(abort·with·^G)
200 1&gt;</code></pre><p>Load·the·<code·class="inline">dyntrace</code>·module.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">l</span><span·class="p"·data-group-id="3496334067-1">(</span><span·class="ss">dyntrace</span><span·class="p"·data-group-id="3496334067-1">)</span><span·class="p">.</span><span·class="w">200 1&gt;</code></pre><p>Load·the·<code·class="inline">dyntrace</code>·module.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">l</span><span·class="p"·data-group-id="5778488406-1">(</span><span·class="ss">dyntrace</span><span·class="p"·data-group-id="5778488406-1">)</span><span·class="p">.</span><span·class="w">
201 </span><span·class="p"·data-group-id="3496334067-2">{</span><span·class="ss">module</span><span·class="p">,</span><span·class="ss">dyntrace</span><span·class="p"·data-group-id="3496334067-2">}</span></code></pre><p>All·tracepoints·via·dyntrace·are·now·visible·and·can·be·listed·through201 </span><span·class="p"·data-group-id="5778488406-2">{</span><span·class="ss">module</span><span·class="p">,</span><span·class="ss">dyntrace</span><span·class="p"·data-group-id="5778488406-2">}</span></code></pre><p>All·tracepoints·via·dyntrace·are·now·visible·and·can·be·listed·through
202 <code·class="inline">lttng·list·-u</code>.</p><p>Enable·the·process_register·LTTng·tracepoint·for·Erlang.</p><pre><code·class="text">$·lttng·enable-event·-u·org_erlang_dyntrace:process_register202 <code·class="inline">lttng·list·-u</code>.</p><p>Enable·the·process_register·LTTng·tracepoint·for·Erlang.</p><pre><code·class="text">$·lttng·enable-event·-u·org_erlang_dyntrace:process_register
203 UST·event·org_erlang_dyntrace:process_register·created·in·channel·channel0</code></pre><p>Enable·process·tracing·for·new·processes·and·use·<code·class="inline">dyntrace</code>·as·tracer·backend.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="2249425013-1">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="ss">true</span><span·class="p">,</span><span·class="p"·data-group-id="2249425013-2">[</span><span·class="ss">procs</span><span·class="p">,</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·391,·SHA:·768ac902abbd3c0f0f3c4e79d7f42f9a9e6048fbf15c3fd93e357ecec07f1481·...·]-1">)</span><span·class="p">.</span><span·class="w">203 UST·event·org_erlang_dyntrace:process_register·created·in·channel·channel0</code></pre><p>Enable·process·tracing·for·new·processes·and·use·<code·class="inline">dyntrace</code>·as·tracer·backend.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="6325641349-1">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="ss">true</span><span·class="p">,</span><span·class="p"·data-group-id="6325641349-2">[</span><span·class="ss">procs</span><span·class="p">,</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·391,·SHA:·e0b32d2d777d06ba7a77163a92d486622d92b2281e1c9091d7055f24ef65947e·...·]-1">)</span><span·class="p">.</span><span·class="w">
204 </span><span·class="mi">0</span></code></pre><p>Start·LTTng·tracing.</p><pre><code·class="text">$·lttng·start204 </span><span·class="mi">0</span></code></pre><p>Start·LTTng·tracing.</p><pre><code·class="text">$·lttng·start
205 Tracing·started·for·session·erlang-demo</code></pre><p>Start·the·<code·class="inline">os_mon</code>·application·in·Erlang.</p><pre><code·class="text">3&gt;·application:ensure_all_started(os_mon).205 Tracing·started·for·session·erlang-demo</code></pre><p>Start·the·<code·class="inline">os_mon</code>·application·in·Erlang.</p><pre><code·class="text">3&gt;·application:ensure_all_started(os_mon).
206 {ok,[sasl,os_mon]}</code></pre><p>Stop·LTTng·tracing·and·view·the·result.</p><pre><code·class="text">$·lttng·stop206 {ok,[sasl,os_mon]}</code></pre><p>Stop·LTTng·tracing·and·view·the·result.</p><pre><code·class="text">$·lttng·stop
207 Tracing·stopped·for·session·erlang-demo207 Tracing·stopped·for·session·erlang-demo
208 $·lttng·view208 $·lttng·view
209 [17:20:42.561168759]·(+?.?????????)·elxd1168lx9·org_erlang_dyntrace:process_register:·\209 [17:20:42.561168759]·(+?.?????????)·elxd1168lx9·org_erlang_dyntrace:process_register:·\
210 ····{·cpu_id·=·5·},·{·pid·=·&quot;&lt;0.66.0&gt;&quot;,·name·=·&quot;sasl_sup&quot;,·type·=·&quot;register&quot;·}210 ····{·cpu_id·=·5·},·{·pid·=·&quot;&lt;0.66.0&gt;&quot;,·name·=·&quot;sasl_sup&quot;,·type·=·&quot;register&quot;·}
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272 ········Built·using272 ········Built·using
273 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the273 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
274 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>274 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
275 ······</p>275 ······</p>
276 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>276 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
277 ····</footer>277 ····</footer>
278 ··</div>278 ··</div>
279 </main>279 </main>
280 </div>280 </div>
281 <script>281 <script>
282 ··function·mermaidLoaded()·{282 ··function·mermaidLoaded()·{
283 ····mermaid.initialize({283 ····mermaid.initialize({
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127 ··</h1>127 ··</h1>
  
  
128 ····<section·id="moduledoc">128 ····<section·id="moduledoc">
129 <p>Convenience·functions·for·microstate·accounting</p><p>This·module·implements·some·convenience·functions·for·analyzing·microstate129 <p>Convenience·functions·for·microstate·accounting</p><p>This·module·implements·some·convenience·functions·for·analyzing·microstate
130 accounting·data.·For·details·about·how·to·use·the·basic·API·and·what·the130 accounting·data.·For·details·about·how·to·use·the·basic·API·and·what·the
131 different·states·represent,·see131 different·states·represent,·see
132 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#statistics_microstate_accounting"><code·class="inline">erlang:statistics(microstate_accounting)</code></a>.</p><p><a·href=""·id="msacc_print_example"></a></p><p><em>Basic·Scenario</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5575020211-1">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="5575020211-1">)</span><span·class="p">.</span><span·class="w">132 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#statistics_microstate_accounting"><code·class="inline">erlang:statistics(microstate_accounting)</code></a>.</p><p><a·href=""·id="msacc_print_example"></a></p><p><em>Basic·Scenario</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4522445680-1">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="4522445680-1">)</span><span·class="p">.</span><span·class="w">
133 </span><span·class="ss">ok</span><span·class="gp·unselectable">133 </span><span·class="ss">ok</span><span·class="gp·unselectable">
134 2&gt;·</span><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="5575020211-2">(</span><span·class="p"·data-group-id="5575020211-2">)</span><span·class="p">.</span><span·class="w">134 2&gt;·</span><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="4522445680-2">(</span><span·class="p"·data-group-id="4522445680-2">)</span><span·class="p">.</span><span·class="w">
135 </span><span·class="n">Average</span><span·class="w">·</span><span·class="ss">thread</span><span·class="w">·</span><span·class="ss">real</span><span·class="o">-</span><span·class="ss">time</span><span·class="w">····</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">1000513</span><span·class="w">·</span><span·class="ss">us</span><span·class="w">135 </span><span·class="n">Average</span><span·class="w">·</span><span·class="ss">thread</span><span·class="w">·</span><span·class="ss">real</span><span·class="o">-</span><span·class="ss">time</span><span·class="w">····</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">1000513</span><span·class="w">·</span><span·class="ss">us</span><span·class="w">
136 </span><span·class="n">Accumulated</span><span·class="w">·</span><span·class="ss">system</span><span·class="w">·</span><span·class="ss">run</span><span·class="o">-</span><span·class="ss">time</span><span·class="w">·</span><span·class="p">:</span><span·class="w">····</span><span·class="mi">2213</span><span·class="w">·</span><span·class="ss">us</span><span·class="w">136 </span><span·class="n">Accumulated</span><span·class="w">·</span><span·class="ss">system</span><span·class="w">·</span><span·class="ss">run</span><span·class="o">-</span><span·class="ss">time</span><span·class="w">·</span><span·class="p">:</span><span·class="w">····</span><span·class="mi">2213</span><span·class="w">·</span><span·class="ss">us</span><span·class="w">
137 </span><span·class="n">Average</span><span·class="w">·</span><span·class="ss">scheduler</span><span·class="w">·</span><span·class="ss">run</span><span·class="o">-</span><span·class="ss">time</span><span·class="w">··</span><span·class="p">:</span><span·class="w">····</span><span·class="mi">1076</span><span·class="w">·</span><span·class="ss">us</span><span·class="w">137 </span><span·class="n">Average</span><span·class="w">·</span><span·class="ss">scheduler</span><span·class="w">·</span><span·class="ss">run</span><span·class="o">-</span><span·class="ss">time</span><span·class="w">··</span><span·class="p">:</span><span·class="w">····</span><span·class="mi">1076</span><span·class="w">·</span><span·class="ss">us</span><span·class="w">
  
138 ········</span><span·class="n">Thread</span><span·class="w">······</span><span·class="ss">aux</span><span·class="w">·</span><span·class="ss">check_io</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·······</span><span·class="ss">gc</span><span·class="w">····</span><span·class="ss">other</span><span·class="w">·····</span><span·class="ss">port</span><span·class="w">····</span><span·class="ss">sleep</span><span·class="w">138 ········</span><span·class="n">Thread</span><span·class="w">······</span><span·class="ss">aux</span><span·class="w">·</span><span·class="ss">check_io</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·······</span><span·class="ss">gc</span><span·class="w">····</span><span·class="ss">other</span><span·class="w">·····</span><span·class="ss">port</span><span·class="w">····</span><span·class="ss">sleep</span><span·class="w">
  
139 </span><span·class="n">Stats</span><span·class="w">·</span><span·class="ss">per</span><span·class="w">·</span><span·class="nc">thread</span><span·class="p">:</span><span·class="w">139 </span><span·class="n">Stats</span><span·class="w">·</span><span·class="ss">per</span><span·class="w">·</span><span·class="nc">thread</span><span·class="p">:</span><span·class="w">
140 ·····</span><span·class="nf">async</span><span·class="p"·data-group-id="5575020211-3">(</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="5575020211-3">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%··100.00%</span><span·class="w">140 ·····</span><span·class="nf">async</span><span·class="p"·data-group-id="4522445680-3">(</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="4522445680-3">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%··100.00%</span><span·class="w">
141 ·····</span><span·class="nf">async</span><span·class="p"·data-group-id="5575020211-4">(</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5575020211-4">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%··100.00%</span><span·class="w">141 ·····</span><span·class="nf">async</span><span·class="p"·data-group-id="4522445680-4">(</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4522445680-4">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%··100.00%</span><span·class="w">
142 ·······</span><span·class="nf">aux</span><span·class="p"·data-group-id="5575020211-5">(</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5575020211-5">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%···99.99%</span><span·class="w">142 ·······</span><span·class="nf">aux</span><span·class="p"·data-group-id="4522445680-5">(</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4522445680-5">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%···99.99%</span><span·class="w">
143 ·</span><span·class="nf">scheduler</span><span·class="p"·data-group-id="5575020211-6">(</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5575020211-6">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.03%····0.13%····0.00%····0.01%····0.00%···99.82%</span><span·class="w">143 ·</span><span·class="nf">scheduler</span><span·class="p"·data-group-id="4522445680-6">(</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4522445680-6">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.03%····0.13%····0.00%····0.01%····0.00%···99.82%</span><span·class="w">
144 ·</span><span·class="nf">scheduler</span><span·class="p"·data-group-id="5575020211-7">(</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="5575020211-7">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.03%····0.00%···99.97%</span><span·class="w">144 ·</span><span·class="nf">scheduler</span><span·class="p"·data-group-id="4522445680-7">(</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="4522445680-7">)</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.03%····0.00%···99.97%</span><span·class="w">
  
145 </span><span·class="n">Stats</span><span·class="w">·</span><span·class="ss">per</span><span·class="w">·</span><span·class="nc">type</span><span·class="p">:</span><span·class="w">145 </span><span·class="n">Stats</span><span·class="w">·</span><span·class="ss">per</span><span·class="w">·</span><span·class="nc">type</span><span·class="p">:</span><span·class="w">
146 ·········</span><span·class="ss">async</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%··100.00%</span><span·class="w">146 ·········</span><span·class="ss">async</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%··100.00%</span><span·class="w">
147 ···········</span><span·class="ss">aux</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%···99.99%</span><span·class="w">147 ···········</span><span·class="ss">aux</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.00%····0.00%····0.00%····0.00%····0.00%···99.99%</span><span·class="w">
148 ·····</span><span·class="ss">scheduler</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.02%····0.06%····0.00%····0.02%····0.00%···99.89%</span><span·class="w">148 ·····</span><span·class="ss">scheduler</span><span·class="w">····</span><span·class="mf">0.00</span><span·class="c1">%····0.02%····0.06%····0.00%····0.02%····0.00%···99.89%</span><span·class="w">
149 </span><span·class="ss">ok</span></code></pre><p>This·first·command·enables·microstate·accounting·for·1000·milliseconds.·See149 </span><span·class="ss">ok</span></code></pre><p>This·first·command·enables·microstate·accounting·for·1000·milliseconds.·See
150 <a·href="#start/0"><code·class="inline">start/0</code></a>,·<a·href="#stop/0"><code·class="inline">stop/0</code></a>,·<a·href="#reset/0"><code·class="inline">reset/0</code></a>,·and·<a·href="#start/1"><code·class="inline">start/1</code></a>·for·more·details.·The·second150 <a·href="#start/0"><code·class="inline">start/0</code></a>,·<a·href="#stop/0"><code·class="inline">stop/0</code></a>,·<a·href="#reset/0"><code·class="inline">reset/0</code></a>,·and·<a·href="#start/1"><code·class="inline">start/1</code></a>·for·more·details.·The·second
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911 ······</div>911 ······</div>
  
912 <p>Print·the·given·microstate·statistics·values·to·standard·out.·With·many·states912 <p>Print·the·given·microstate·statistics·values·to·standard·out.·With·many·states
913 this·can·be·verbose.·See·the·top·of·this·reference·manual·for·a·brief913 this·can·be·verbose.·See·the·top·of·this·reference·manual·for·a·brief
914 description·of·what·the·fields·mean.</p><p>It·is·possible·to·print·more·specific·types·of·statistics·by·first·manipulating914 description·of·what·the·fields·mean.</p><p>It·is·possible·to·print·more·specific·types·of·statistics·by·first·manipulating
915 the·<code·class="inline">DataOrStats</code>·using·<a·href="#stats/2"><code·class="inline">stats/2</code></a>.·For·instance·if·you·want·to·print·the915 the·<code·class="inline">DataOrStats</code>·using·<a·href="#stats/2"><code·class="inline">stats/2</code></a>.·For·instance·if·you·want·to·print·the
916 percentage·of·run-time·for·each·thread·you·can·do:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="8517615406-1">(</span><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">stats</span><span·class="p"·data-group-id="8517615406-2">(</span><span·class="ss">runtime</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">msa[·...·truncated·by·diffoscope;·len:·1323,·SHA:·80591002a165b6428e4d55f0cb8cd66106909295bf26dd2ed298a4419089a712·...·]-1">)</span><span·class="p">.</span></code></pre><p><em>Options</em></p><ul><li><strong><code·class="inline">system</code></strong>·-·Print·percentage·of·time·spent·in·each·state·out·of·system·time916 percentage·of·run-time·for·each·thread·you·can·do:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">print</span><span·class="p"·data-group-id="1185720720-1">(</span><span·class="nc">msacc</span><span·class="p">:</span><span·class="nf">stats</span><span·class="p"·data-group-id="1185720720-2">(</span><span·class="ss">runtime</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">msa[·...·truncated·by·diffoscope;·len:·1323,·SHA:·d0ae7583a44ff2326c7c5dd8a1e45d3166fa4f96fbf94525c7ecef84bd73cc0e·...·]-1">)</span><span·class="p">.</span></code></pre><p><em>Options</em></p><ul><li><strong><code·class="inline">system</code></strong>·-·Print·percentage·of·time·spent·in·each·state·out·of·system·time
917 as·well·as·thread·time.·Default:·false.</li></ul>917 as·well·as·thread·time.·Default:·false.</li></ul>
918 ··</section>918 ··</section>
919 </section>919 </section>
920 <section·class="detail"·id="print/3">920 <section·class="detail"·id="print/3">
  
921 ··<div·class="detail-header">921 ··<div·class="detail-header">
922 ····<a·href="#print/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">922 ····<a·href="#print/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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1186 ······<p·class="built-using">1186 ······<p·class="built-using">
1187 ········Built·using1187 ········Built·using
1188 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1188 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1190 ······</p>1190 ······</p>
1191 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1191 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1192 ····</footer>1192 ····</footer>
1193 ··</div>1193 ··</div>
1194 </main>1194 </main>
1195 </div>1195 </div>
1196 <script>1196 <script>
1197 ··function·mermaidLoaded()·{1197 ··function·mermaidLoaded()·{
1198 ····mermaid.initialize({1198 ····mermaid.initialize({
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1276 ········Built·using1276 ········Built·using
1277 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1277 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1278 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1278 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1279 ······</p>1279 ······</p>
1280 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1280 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1281 ····</footer>1281 ····</footer>
1282 ··</div>1282 ··</div>
1283 </main>1283 </main>
1284 </div>1284 </div>
1285 <script>1285 <script>
1286 ··function·mermaidLoaded()·{1286 ··function·mermaidLoaded()·{
1287 ····mermaid.initialize({1287 ····mermaid.initialize({
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592 <p>Measure·utilization·for·normal·and·dirty-cpu·schedulers·during·<code·class="inline">Seconds</code>592 <p>Measure·utilization·for·normal·and·dirty-cpu·schedulers·during·<code·class="inline">Seconds</code>
593 seconds,·and·then·return·the·result.</p><p>Will·automatically·first·enable·and·then·disable593 seconds,·and·then·return·the·result.</p><p>Will·automatically·first·enable·and·then·disable
594 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#system_flag_scheduler_wall_time"><code·class="inline">scheduler_wall_time</code></a>.</p><p>Calculate·scheduler·utilizations·for·the·time·interval·from·when·<code·class="inline">Sample</code>·was594 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#system_flag_scheduler_wall_time"><code·class="inline">scheduler_wall_time</code></a>.</p><p>Calculate·scheduler·utilizations·for·the·time·interval·from·when·<code·class="inline">Sample</code>·was
595 taken·and·&quot;now&quot;.·The·same·as·calling595 taken·and·&quot;now&quot;.·The·same·as·calling
596 <code·class="inline">scheduler:utilization(Sample,·scheduler:sample_all())</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·function·is·<em>not·recommended</em>·as·it's·so·easy·to·get·invalid·results596 <code·class="inline">scheduler:utilization(Sample,·scheduler:sample_all())</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·function·is·<em>not·recommended</em>·as·it's·so·easy·to·get·invalid·results
597 without·noticing.·In·particular·do·not·do·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">scheduler</span><span·class="p">:</span><span·class="nf">utilization</span><span·class="p"·data-group-id="2846062067-1">(</span><span·class="nc">scheduler</span><span·class="p">:</span><span·class="nf">sample</span><span·class="p"·data-group-id="2846062067-2">(</span><span·class="p"·data-group-id="2846062067-2">)</span><span·class="p"·data-group-id="2846062067-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·DO·NOT·DO·THIS!</span></code></pre><p>The·above·example·takes·two·samples·in·rapid·succession·and·calculates·the597 without·noticing.·In·particular·do·not·do·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">scheduler</span><span·class="p">:</span><span·class="nf">utilization</span><span·class="p"·data-group-id="8113827685-1">(</span><span·class="nc">scheduler</span><span·class="p">:</span><span·class="nf">sample</span><span·class="p"·data-group-id="8113827685-2">(</span><span·class="p"·data-group-id="8113827685-2">)</span><span·class="p"·data-group-id="8113827685-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·DO·NOT·DO·THIS!</span></code></pre><p>The·above·example·takes·two·samples·in·rapid·succession·and·calculates·the
598 scheduler·utilization·between·them.·The·resulting·values·will·probably·be·more598 scheduler·utilization·between·them.·The·resulting·values·will·probably·be·more
599 misleading·than·informative.</p><p>Instead·use·<a·href="#utilization/2"><code·class="inline">scheduler:utilization/2</code></a>·and·call599 misleading·than·informative.</p><p>Instead·use·<a·href="#utilization/2"><code·class="inline">scheduler:utilization/2</code></a>·and·call
600 <a·href="#get_sample/0"><code·class="inline">get_sample/0</code></a>·to·get·samples·with·some·time·in·between.</p></section>600 <a·href="#get_sample/0"><code·class="inline">get_sample/0</code></a>·to·get·samples·with·some·time·in·between.</p></section>
601 ··</section>601 ··</section>
602 </section>602 </section>
603 <section·class="detail"·id="utilization/2">603 <section·class="detail"·id="utilization/2">
  
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217 that·is,·if·a·process·using·the·module·spontaneously·switches·to·new·code,·or217 that·is,·if·a·process·using·the·module·spontaneously·switches·to·new·code,·or
218 if·it·is·&quot;static&quot;.·When·doing·an·advanced·update·and·upgrade,·the·new·version218 if·it·is·&quot;static&quot;.·When·doing·an·advanced·update·and·upgrade,·the·new·version
219 of·a·dynamic·module·is·loaded·before·the·process·is·asked·to·change·code.·When219 of·a·dynamic·module·is·loaded·before·the·process·is·asked·to·change·code.·When
220 downgrading,·the·process·is·asked·to·change·code·before·loading·the·new220 downgrading,·the·process·is·asked·to·change·code·before·loading·the·new
221 version.·For·static·modules,·the·new·version·is·loaded·before·the·process·is221 version.·For·static·modules,·the·new·version·is·loaded·before·the·process·is
222 asked·to·change·code,·both·in·the·case·of·upgrading·and·downgrading.·Callback222 asked·to·change·code,·both·in·the·case·of·upgrading·and·downgrading.·Callback
223 modules·are·dynamic.</p></li></ul><p><code·class="inline">update</code>·with·argument·<code·class="inline">supervisor</code>·is·used·when·changing·the·start223 modules·are·dynamic.</p></li></ul><p><code·class="inline">update</code>·with·argument·<code·class="inline">supervisor</code>·is·used·when·changing·the·start
224 specification·of·a·supervisor.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9996822018-1">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="9996822018-1">}</span><span·class="w">224 specification·of·a·supervisor.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6671392891-1">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="6671392891-1">}</span><span·class="w">
225 </span><span·class="p"·data-group-id="9996822018-2">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="9996822018-2">}</span><span·class="w">225 </span><span·class="p"·data-group-id="6671392891-2">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="6671392891-2">}</span><span·class="w">
226 </span><span·class="p"·data-group-id="9996822018-3">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrePurge</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·153,·SHA:·28edf740db3ae099a5097d5164ee45b1e086d6dbee440a1eaff1f38b5e875324·...·]-3">}</span><span·class="w">226 </span><span·class="p"·data-group-id="6671392891-3">{</span><span·class="nb">load_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">PrePurge</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·153,·SHA:·18d26a993146ebc2c168ac9884b1bbb751e5d7f11c61718444d6969388fe4cf1·...·]-3">}</span><span·class="w">
227 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="9996822018-4">(</span><span·class="p"·data-group-id="9996822018-4">)</span><span·class="w">227 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6671392891-4">(</span><span·class="p"·data-group-id="6671392891-4">)</span><span·class="w">
228 ··</span><span·class="n">PrePurge</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">PostPurge</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">soft_purge</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">brutal_purge</span><span·class="w">228 ··</span><span·class="n">PrePurge</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">PostPurge</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">soft_purge</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">brutal_purge</span><span·class="w">
229 ··</span><span·class="n">DepMods</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9996822018-5">[</span><span·class="n">Mod</span><span·class="p"·data-group-id="9996822018-5">]</span></code></pre><p>Simple·code·replacement·of·the·module·<code·class="inline">Mod</code>.</p><p>For·a·description·of·<code·class="inline">PrePurge</code>·and·<code·class="inline">PostPurge</code>,·see·<code·class="inline">update</code>·above.</p><p><code·class="inline">DepMods</code>·defaults·to·<code·class="inline">[]</code>·and·defines·which·other·modules·<code·class="inline">Mod</code>·is·dependent229 ··</span><span·class="n">DepMods</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="6671392891-5">[</span><span·class="n">Mod</span><span·class="p"·data-group-id="6671392891-5">]</span></code></pre><p>Simple·code·replacement·of·the·module·<code·class="inline">Mod</code>.</p><p>For·a·description·of·<code·class="inline">PrePurge</code>·and·<code·class="inline">PostPurge</code>,·see·<code·class="inline">update</code>·above.</p><p><code·class="inline">DepMods</code>·defaults·to·<code·class="inline">[]</code>·and·defines·which·other·modules·<code·class="inline">Mod</code>·is·dependent
230 on.·In·the·<code·class="inline">relup</code>·file,·instructions·for·loading·these·modules·come·before·the230 on.·In·the·<code·class="inline">relup</code>·file,·instructions·for·loading·these·modules·come·before·the
231 instruction·for·loading·<code·class="inline">Mod</code>·when·upgrading,·and·conversely·when·downgrading.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7940764204-1">{</span><span·class="ss">add_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="7940764204-1">}</span><span·class="w">231 instruction·for·loading·<code·class="inline">Mod</code>·when·upgrading,·and·conversely·when·downgrading.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9219510371-1">{</span><span·class="ss">add_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="9219510371-1">}</span><span·class="w">
232 </span><span·class="p"·data-group-id="7940764204-2">{</span><span·class="ss">add_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="7940764204-2">}</span><span·class="w">232 </span><span·class="p"·data-group-id="9219510371-2">{</span><span·class="ss">add_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="9219510371-2">}</span><span·class="w">
233 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="7940764204-3">(</span><span·class="p"·data-group-id="7940764204-3">)</span><span·class="w">233 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="9219510371-3">(</span><span·class="p"·data-group-id="9219510371-3">)</span><span·class="w">
234 ··</span><span·class="n">DepMods</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7940764204-4">[</span><span·class="n">Mod</span><span·class="p"·data-group-id="7940764204-4">]</span></code></pre><p>Loads·a·new·module·<code·class="inline">Mod</code>.</p><p><code·class="inline">DepMods</code>·defaults·to·<code·class="inline">[]</code>·and·defines·which·other·modules·<code·class="inline">Mod</code>·is·dependent234 ··</span><span·class="n">DepMods</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9219510371-4">[</span><span·class="n">Mod</span><span·class="p"·data-group-id="9219510371-4">]</span></code></pre><p>Loads·a·new·module·<code·class="inline">Mod</code>.</p><p><code·class="inline">DepMods</code>·defaults·to·<code·class="inline">[]</code>·and·defines·which·other·modules·<code·class="inline">Mod</code>·is·dependent
235 on.·In·the·<code·class="inline">relup</code>·file,·instructions·related·to·these·modules·come·before·the235 on.·In·the·<code·class="inline">relup</code>·file,·instructions·related·to·these·modules·come·before·the
236 instruction·for·loading·<code·class="inline">Mod</code>·when·upgrading,·and·conversely·when·downgrading.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4237976658-1">{</span><span·class="nb">delete_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="4237976658-1">}</span><span·class="w">236 instruction·for·loading·<code·class="inline">Mod</code>·when·upgrading,·and·conversely·when·downgrading.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3431137753-1">{</span><span·class="nb">delete_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p"·data-group-id="3431137753-1">}</span><span·class="w">
237 </span><span·class="p"·data-group-id="4237976658-2">{</span><span·class="nb">delete_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="4237976658-2">}</span><span·class="w">237 </span><span·class="p"·data-group-id="3431137753-2">{</span><span·class="nb">delete_module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DepMods</span><span·class="p"·data-group-id="3431137753-2">}</span><span·class="w">
238 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="4237976658-3">(</span><span·class="p"·data-group-id="4237976658-3">)</span></code></pre><p>Deletes·a·module·<code·class="inline">Mod</code>·using·the·low-level·instructions·<code·class="inline">remove</code>·and·<code·class="inline">purge</code>.</p><p><code·class="inline">DepMods</code>·defaults·to·<code·class="inline">[]</code>·and·defines·which·other·modules·<code·class="inline">Mod</code>·is·dependent238 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="3431137753-3">(</span><span·class="p"·data-group-id="3431137753-3">)</span></code></pre><p>Deletes·a·module·<code·class="inline">Mod</code>·using·the·low-level·instructions·<code·class="inline">remove</code>·and·<code·class="inline">purge</code>.</p><p><code·class="inline">DepMods</code>·defaults·to·<code·class="inline">[]</code>·and·defines·which·other·modules·<code·class="inline">Mod</code>·is·dependent
239 on.·In·the·<code·class="inline">relup</code>·file,·instructions·related·to·these·modules·come·before·the239 on.·In·the·<code·class="inline">relup</code>·file,·instructions·related·to·these·modules·come·before·the
240 instruction·for·removing·<code·class="inline">Mod</code>·when·upgrading,·and·conversely·when·downgrading.</p><pre><code·class="text">{add_application,·Application}240 instruction·for·removing·<code·class="inline">Mod</code>·when·upgrading,·and·conversely·when·downgrading.</p><pre><code·class="text">{add_application,·Application}
241 {add_application,·Application,·Type}241 {add_application,·Application,·Type}
242 ··Application·=·atom()242 ··Application·=·atom()
243 ··Type·=·permanent·|·transient·|·temporary·|·load·|·none</code></pre><p>Adding·an·application·means·that·the·modules·defined·by·the·<code·class="inline">modules</code>·key·in·the243 ··Type·=·permanent·|·transient·|·temporary·|·load·|·none</code></pre><p>Adding·an·application·means·that·the·modules·defined·by·the·<code·class="inline">modules</code>·key·in·the
244 <code·class="inline">.app</code>·file·are·loaded·using·<code·class="inline">add_module</code>.</p><p><code·class="inline">Type</code>·defaults·to·<code·class="inline">permanent</code>·and·specifies·the·start·type·of·the·application.244 <code·class="inline">.app</code>·file·are·loaded·using·<code·class="inline">add_module</code>.</p><p><code·class="inline">Type</code>·defaults·to·<code·class="inline">permanent</code>·and·specifies·the·start·type·of·the·application.
245 If·<code·class="inline">Type·=·permanent·|·transient·|·temporary</code>,·the·application·is·loaded·and245 If·<code·class="inline">Type·=·permanent·|·transient·|·temporary</code>,·the·application·is·loaded·and
Offset 258, 62 lines modifiedOffset 258, 62 lines modified
258 application·is·not·loaded·and·not·started,·although·the·code·for·its·modules·is258 application·is·not·loaded·and·not·started,·although·the·code·for·its·modules·is
259 loaded.</p><h3·id="low-level-instructions"·class="section-heading">259 loaded.</p><h3·id="low-level-instructions"·class="section-heading">
260 ··<a·href="#low-level-instructions"·class="hover-link">260 ··<a·href="#low-level-instructions"·class="hover-link">
261 ····<i·class="ri-link-m"·aria-hidden="true"></i>261 ····<i·class="ri-link-m"·aria-hidden="true"></i>
262 ··</a>262 ··</a>
263 ··<span·class="text">Low-Level·Instructions</span>263 ··<span·class="text">Low-Level·Instructions</span>
264 </h3>264 </h3>
265 <pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5279320106-1">{</span><span·class="ss">load_object_code</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5279320106-2">{</span><span·class="n">App</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Vsn[·...·truncated·by·diffoscope;·len:·281,·SHA:·f75e59ac1b234c1bf56e6657782120e8b361ad77851886b8a68e2eb79055ab0c·...·]-1">}</span><span·class="w">265 <pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7942954212-1">{</span><span·class="ss">load_object_code</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7942954212-2">{</span><span·class="n">App</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Vsn[·...·truncated·by·diffoscope;·len:·281,·SHA:·916b19a3345f64d1707451328f23a6890a04cc4e9aee80da98bf60e1ff24e05a·...·]-1">}</span><span·class="w">
266 ··</span><span·class="n">App</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="5279320106-4">(</span><span·class="p"·data-group-id="5279320106-4">)</span><span·class="w">266 ··</span><span·class="n">App</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="7942954212-4">(</span><span·class="p"·data-group-id="7942954212-4">)</span><span·class="w">
267 ··</span><span·class="n">Vsn</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="5279320106-5">(</span><span·class="p"·data-group-id="5279320106-5">)</span></code></pre><p>Reads·each·<code·class="inline">Mod</code>·from·directory·<code·class="inline">App-Vsn/ebin</code>·as·a·binary.·It·does·not·load·the267 ··</span><span·class="n">Vsn</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="7942954212-5">(</span><span·class="p"·data-group-id="7942954212-5">)</span></code></pre><p>Reads·each·<code·class="inline">Mod</code>·from·directory·<code·class="inline">App-Vsn/ebin</code>·as·a·binary.·It·does·not·load·the
268 modules.·The·instruction·is·to·be·placed·first·in·the·script·to·read·all·new268 modules.·The·instruction·is·to·be·placed·first·in·the·script·to·read·all·new
269 code·from·the·file·to·make·the·suspend-load-resume·cycle·less·time-consuming.</p><pre><code·class="text">point_of_no_return</code></pre><p>If·a·crash·occurs·after·this·instruction,·the·system·cannot·recover·and·is269 code·from·the·file·to·make·the·suspend-load-resume·cycle·less·time-consuming.</p><pre><code·class="text">point_of_no_return</code></pre><p>If·a·crash·occurs·after·this·instruction,·the·system·cannot·recover·and·is
270 restarted·from·the·old·release·version.·The·instruction·must·only·occur·once·in270 restarted·from·the·old·release·version.·The·instruction·must·only·occur·once·in
271 a·script.·It·is·to·be·placed·after·all·<code·class="inline">load_object_code</code>·instructions.</p><pre><code·class="text">{load,·{Mod,·PrePurge,·PostPurge}}271 a·script.·It·is·to·be·placed·after·all·<code·class="inline">load_object_code</code>·instructions.</p><pre><code·class="text">{load,·{Mod,·PrePurge,·PostPurge}}
272 ··Mod·=·atom()272 ··Mod·=·atom()
273 ··PrePurge·=·PostPurge·=·soft_purge·|·brutal_purge</code></pre><p>Before·this·instruction·occurs,·<code·class="inline">Mod</code>·must·have·been·loaded·using273 ··PrePurge·=·PostPurge·=·soft_purge·|·brutal_purge</code></pre><p>Before·this·instruction·occurs,·<code·class="inline">Mod</code>·must·have·been·loaded·using
274 <code·class="inline">load_object_code</code>.·This·instruction·loads·the·module.·<code·class="inline">PrePurge</code>·is·ignored.274 <code·class="inline">load_object_code</code>.·This·instruction·loads·the·module.·<code·class="inline">PrePurge</code>·is·ignored.
275 For·a·description·of·<code·class="inline">PostPurge</code>,·see·the·high-level·instruction·<code·class="inline">update</code>275 For·a·description·of·<code·class="inline">PostPurge</code>,·see·the·high-level·instruction·<code·class="inline">update</code>
276 earlier.</p><pre><code·class="text">{remove,·{Mod,·PrePurge,·PostPurge}}276 earlier.</p><pre><code·class="text">{remove,·{Mod,·PrePurge,·PostPurge}}
277 ··Mod·=·atom()277 ··Mod·=·atom()
278 ··PrePurge·=·PostPurge·=·soft_purge·|·brutal_purge</code></pre><p>Makes·the·current·version·of·<code·class="inline">Mod</code>·old.·<code·class="inline">PrePurge</code>·is·ignored.·For·a·description278 ··PrePurge·=·PostPurge·=·soft_purge·|·brutal_purge</code></pre><p>Makes·the·current·version·of·<code·class="inline">Mod</code>·old.·<code·class="inline">PrePurge</code>·is·ignored.·For·a·description
279 of·<code·class="inline">PostPurge</code>,·see·the·high-level·instruction·<code·class="inline">update</code>·earlier.</p><pre><code·class="text">{purge,·[Mod]}279 of·<code·class="inline">PostPurge</code>,·see·the·high-level·instruction·<code·class="inline">update</code>·earlier.</p><pre><code·class="text">{purge,·[Mod]}
280 ··Mod·=·atom()</code></pre><p>Purges·each·module·<code·class="inline">Mod</code>,·that·is,·removes·the·old·code.·Notice·that·any·process280 ··Mod·=·atom()</code></pre><p>Purges·each·module·<code·class="inline">Mod</code>,·that·is,·removes·the·old·code.·Notice·that·any·process
281 executing·purged·code·is·killed.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3586367561-1">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3586367561-2">[</span><span·class="n">Mod</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·300,·SHA:·e788f638f43558598e2ca286d8c67818743a3fdb872ceb16199213f3452319d7·...·]-1">}</span><span·class="w">281 executing·purged·code·is·killed.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6870519818-1">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6870519818-2">[</span><span·class="n">Mod</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·300,·SHA:·4c08dcc1292b91a58e236b2e636072de21dff37840f37a7f3e80ea47f5763bd2·...·]-1">}</span><span·class="w">
282 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="3586367561-4">(</span><span·class="p"·data-group-id="3586367561-4">)</span><span·class="w">282 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6870519818-4">(</span><span·class="p"·data-group-id="6870519818-4">)</span><span·class="w">
283 ··</span><span·class="n">Timeout</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="3586367561-5">(</span><span·class="p"·data-group-id="3586367561-5">)</span><span·class="o">&gt;</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">default</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">infinity</span></code></pre><p>Tries·to·suspend·all·processes·using·a·module·<code·class="inline">Mod</code>.·If·a·process·does·not283 ··</span><span·class="n">Timeout</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="6870519818-5">(</span><span·class="p"·data-group-id="6870519818-5">)</span><span·class="o">&gt;</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">default</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">infinity</span></code></pre><p>Tries·to·suspend·all·processes·using·a·module·<code·class="inline">Mod</code>.·If·a·process·does·not
284 respond,·it·is·ignored.·This·can·cause·the·process·to·die,·either·because·it284 respond,·it·is·ignored.·This·can·cause·the·process·to·die,·either·because·it
285 crashes·when·it·spontaneously·switches·to·new·code,·or·as·a·result·of·a·purge285 crashes·when·it·spontaneously·switches·to·new·code,·or·as·a·result·of·a·purge
286 operation.·If·no·<code·class="inline">Timeout</code>·is·specified·or·<code·class="inline">default</code>·is·specified,·the·default286 operation.·If·no·<code·class="inline">Timeout</code>·is·specified·or·<code·class="inline">default</code>·is·specified,·the·default
287 value·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/sys.html#suspend/1"><code·class="inline">sys:suspend</code></a>·is·used.</p><pre><code·class="text">{resume,·[Mod]}287 value·for·<a·href="../../../../lib/stdlib-6.2.2/doc/html/sys.html#suspend/1"><code·class="inline">sys:suspend</code></a>·is·used.</p><pre><code·class="text">{resume,·[Mod]}
288 ··Mod·=·atom()</code></pre><p>Resumes·all·suspended·processes·using·a·module·<code·class="inline">Mod</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1150633725-1">{</span><span·class="ss">code_change</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1150633725-2">[</span><span·class="p"·data-group-id="1150633725-3">{</span><span·class="n">Mod</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·204,·SHA:·52f60d6845e7b0fe4ab27ecf8330f12ca396aa87cc870db73abe1cf799d3e8e5·...·]-1">}</span><span·class="w">288 ··Mod·=·atom()</code></pre><p>Resumes·all·suspended·processes·using·a·module·<code·class="inline">Mod</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8726336906-1">{</span><span·class="ss">code_change</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8726336906-2">[</span><span·class="p"·data-group-id="8726336906-3">{</span><span·class="n">Mod</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·204,·SHA:·e5c3bb49e0ab2d1a7b9a8813e38517c0fbbb5bfcfdf982b216f06d1175879fb0·...·]-1">}</span><span·class="w">
289 </span><span·class="p"·data-group-id="1150633725-4">{</span><span·class="ss">code_change</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1150633725-5">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·279,·SHA:·5c4d298f1c582ccb4b0fa9633bc8bfa420acba104fd71d1c51a57ad339528e1d·...·]-4">}</span><span·class="w">289 </span><span·class="p"·data-group-id="8726336906-4">{</span><span·class="ss">code_change</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8726336906-5">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·279,·SHA:·761acdc5ea5d7088f7686055076bce21ab87c6c18cf15b778a2f0c2220e6808f·...·]-4">}</span><span·class="w">
290 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="1150633725-7">(</span><span·class="p"·data-group-id="1150633725-7">)</span><span·class="w">290 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="8726336906-7">(</span><span·class="p"·data-group-id="8726336906-7">)</span><span·class="w">
291 ··</span><span·class="n">Mode</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">up</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">down</span><span·class="w">291 ··</span><span·class="n">Mode</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">up</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">down</span><span·class="w">
292 ··</span><span·class="n">Extra</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="1150633725-8">(</span><span·class="p"·data-group-id="1150633725-8">)</span></code></pre><p><code·class="inline">Mode</code>·defaults·to·<code·class="inline">up</code>·and·specifies·if·it·is·an·upgrade·or·downgrade.·This292 ··</span><span·class="n">Extra</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="8726336906-8">(</span><span·class="p"·data-group-id="8726336906-8">)</span></code></pre><p><code·class="inline">Mode</code>·defaults·to·<code·class="inline">up</code>·and·specifies·if·it·is·an·upgrade·or·downgrade.·This
293 instruction·sends·a·<code·class="inline">code_change</code>·system·message·to·all·processes·using·a·module293 instruction·sends·a·<code·class="inline">code_change</code>·system·message·to·all·processes·using·a·module
294 <code·class="inline">Mod</code>·by·calling·function·<a·href="../../../../lib/stdlib-6.2.2/doc/html/sys.html#change_code/4"><code·class="inline">sys:change_code</code></a>,·passing·term294 <code·class="inline">Mod</code>·by·calling·function·<a·href="../../../../lib/stdlib-6.2.2/doc/html/sys.html#change_code/4"><code·class="inline">sys:change_code</code></a>,·passing·term
295 <code·class="inline">Extra</code>·as·argument.</p><pre><code·class="text">{stop,·[Mod]}295 <code·class="inline">Extra</code>·as·argument.</p><pre><code·class="text">{stop,·[Mod]}
296 ··Mod·=·atom()</code></pre><p>Stops·all·processes·using·a·module·<code·class="inline">Mod</code>·by·calling296 ··Mod·=·atom()</code></pre><p>Stops·all·processes·using·a·module·<code·class="inline">Mod</code>·by·calling
297 <a·href="../../../../lib/stdlib-6.2.2/doc/html/supervisor.html#terminate_child/2"><code·class="inline">supervisor:terminate_child/2</code></a>.·This·instruction·is·useful·when·the·simplest·way297 <a·href="../../../../lib/stdlib-6.2.2/doc/html/supervisor.html#terminate_child/2"><code·class="inline">supervisor:terminate_child/2</code></a>.·This·instruction·is·useful·when·the·simplest·way
298 to·change·code·is·to·stop·and·restart·the·processes·that·run·the·code.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6684223760-1">{</span><span·class="ss">start</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6684223760-2">[</span><span·class="n">Mod</span><span·class="p"·data-group-id="6684223760-2">]</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·7837eef35701e9c03fa31768b43bdbe02d5410f85f30e7d72ac29e94cf395444·...·]0-1">}</span><span·class="w">298 to·change·code·is·to·stop·and·restart·the·processes·that·run·the·code.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5864860770-1">{</span><span·class="ss">start</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5864860770-2">[</span><span·class="n">Mod</span><span·class="p"·data-group-id="5864860770-2">]</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·bce4ef52d0d8936e9a939bea1ecfd7f56f16a262dc23736054f158abab127c83·...·]0-1">}</span><span·class="w">
299 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="6684223760-3">(</span><span·class="p"·data-group-id="6684223760-3">)</span></code></pre><p>Starts·all·stopped·processes·using·a·module·<code·class="inline">Mod</code>·by·calling299 ··</span><span·class="n">Mod</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="5864860770-3">(</span><span·class="p"·data-group-id="5864860770-3">)</span></code></pre><p>Starts·all·stopped·processes·using·a·module·<code·class="inline">Mod</code>·by·calling
300 <a·href="../../../../lib/stdlib-6.2.2/doc/html/supervisor.html#restart_child/2"><code·class="inline">supervisor:restart_child/2</code></a>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0873723932-1">{</span><span·class="ss">sync_nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0873723932-2">[</span><span·class="n">Node</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·2af1c99da09eb697339218b9d868955380fca579e9a5d9232ab2e1f810287e52·...·]-1">}</span><span·class="w">300 <a·href="../../../../lib/stdlib-6.2.2/doc/html/supervisor.html#restart_child/2"><code·class="inline">supervisor:restart_child/2</code></a>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5355846124-1">{</span><span·class="ss">sync_nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5355846124-2">[</span><span·class="n">Node</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·2d05a35dad312d214a512e75678215d04cb226ac342122407c5da411d5dffef4·...·]-1">}</span><span·class="w">
301 </span><span·class="p"·data-group-id="0873723932-3">{</span><span·class="ss">sync_nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0873723932-4">{</span><span·class="n">M</span><s[·...·truncated·by·diffoscope;·len:·236,·SHA:·fa92cb26bedf8715a243fd50556d0f246ce05cfd210bc3c17b8aaf397dd6b6dc·...·]-3">}</span><span·class="w">301 </span><span·class="p"·data-group-id="5355846124-3">{</span><span·class="ss">sync_nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5355846124-4">{</span><span·class="n">M</span><s[·...·truncated·by·diffoscope;·len:·236,·SHA:·fb9e049a50e62d17fa81648f6c8fe466101430a6f71d7fc270815dfc8dfc8b4f·...·]-3">}</span><span·class="w">
302 ··</span><span·class="n">Id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="0873723932-5">(</span><span·class="p"·data-group-id="0873723932-5">)</span><span·class="w">302 ··</span><span·class="n">Id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="5355846124-5">(</span><span·class="p"·data-group-id="5355846124-5">)</span><span·class="w">
303 ··</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="0873723932-6">(</span><span·class="p"·data-group-id="0873723932-6">)</span><span·class="w">303 ··</span><span·class="n">Node</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">node</span><span·class="p"·data-group-id="5355846124-6">(</span><span·class="p"·data-group-id="5355846124-6">)</span><span·class="w">
304 ··</span><span·class="n">M</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="0873723932-7">(</span><span·class="p"·data-group-id="0873723932-7">)</span><span·class="w">304 ··</span><span·class="n">M</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="5355846124-7">(</span><span·class="p"·data-group-id="5355846124-7">)</span><span·class="w">
305 ··</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0873723932-8">[</span><span·class="nf">term</span><span·class="p"·data-group-id="0873723932-9">(</span><span·class="p"·data-group-id="0873723932-9">)</span><span·class="p"·data-group-id="0873723932-8">]</span></code></pre><p><a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,·F,·A)</code></a>·must·return·a·list·of·nodes.</p><p>This·instruction·synchronizes·the·release·installation·with·other·nodes.·Each305 ··</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5355846124-8">[</span><span·class="nf">term</span><span·class="p"·data-group-id="5355846124-9">(</span><span·class="p"·data-group-id="5355846124-9">)</span><span·class="p"·data-group-id="5355846124-8">]</span></code></pre><p><a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,·F,·A)</code></a>·must·return·a·list·of·nodes.</p><p>This·instruction·synchronizes·the·release·installation·with·other·nodes.·Each
306 <code·class="inline">Node</code>·must·evaluate·this·command·with·the·same·<code·class="inline">Id</code>.·The·local·node·waits·for306 <code·class="inline">Node</code>·must·evaluate·this·command·with·the·same·<code·class="inline">Id</code>.·The·local·node·waits·for
307 all·other·nodes·to·evaluate·the·instruction·before·execution·continues.·If·a307 all·other·nodes·to·evaluate·the·instruction·before·execution·continues.·If·a
308 node·goes·down,·it·is·considered·to·be·an·unrecoverable·error,·and·the·local308 node·goes·down,·it·is·considered·to·be·an·unrecoverable·error,·and·the·local
309 node·is·restarted·from·the·old·release.·There·is·no·time-out·for·this309 node·is·restarted·from·the·old·release.·There·is·no·time-out·for·this
310 instruction,·which·means·that·it·can·hang·forever.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2825029383-1">{</span><span·class="nb">apply</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2825029383-2">{</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·cl[·...·truncated·by·diffoscope;·len:·158,·SHA:·7e8770bab19deba68cbdbc27162d42c0fb0b70e1d41054baafc3e88f90ce4aae·...·]-1">}</span><span·class="w">310 instruction,·which·means·that·it·can·hang·forever.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3399423031-1">{</span><span·class="nb">apply</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3399423031-2">{</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">F</span><span·cl[·...·truncated·by·diffoscope;·len:·158,·SHA:·fe5412e3e18a2c72a2b7ccefc32dc575d41d7124b6c66b652faf8615feec7394·...·]-1">}</span><span·class="w">
311 ··</span><span·class="n">M</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="2825029383-3">(</span><span·class="p"·data-group-id="2825029383-3">)</span><span·class="w">311 ··</span><span·class="n">M</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">atom</span><span·class="p"·data-group-id="3399423031-3">(</span><span·class="p"·data-group-id="3399423031-3">)</span><span·class="w">
312 ··</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="2825029383-4">[</span><span·class="nf">term</span><span·class="p"·data-group-id="2825029383-5">(</span><span·class="p"·data-group-id="2825029383-5">)</span><span·class="p"·data-group-id="2825029383-4">]</span></code></pre><p>Evaluates·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,·F,·A)</code></a>.</p><p>If·the·instruction·appears·before·instruction·<code·class="inline">point_of_no_return</code>,·a·failure·is312 ··</span><span·class="n">A</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3399423031-4">[</span><span·class="nf">term</span><span·class="p"·data-group-id="3399423031-5">(</span><span·class="p"·data-group-id="3399423031-5">)</span><span·class="p"·data-group-id="3399423031-4">]</span></code></pre><p>Evaluates·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,·F,·A)</code></a>.</p><p>If·the·instruction·appears·before·instruction·<code·class="inline">point_of_no_return</code>,·a·failure·is
313 caught.·<a·href="release_handler.html#install_release/1"><code·class="inline">release_handler:install_release/1</code></a>·then·returns313 caught.·<a·href="release_handler.html#install_release/1"><code·class="inline">release_handler:install_release/1</code></a>·then·returns
314 <code·class="inline">{error,{'EXIT',Reason}}</code>,·unless·<code·class="inline">{error,Error}</code>·is·thrown·or·returned.·Then·it314 <code·class="inline">{error,{'EXIT',Reason}}</code>,·unless·<code·class="inline">{error,Error}</code>·is·thrown·or·returned.·Then·it
315 returns·<code·class="inline">{error,Error}</code>.</p><p>If·the·instruction·appears·after·instruction·<code·class="inline">point_of_no_return</code>·and·the315 returns·<code·class="inline">{error,Error}</code>.</p><p>If·the·instruction·appears·after·instruction·<code·class="inline">point_of_no_return</code>·and·the
316 function·call·fails,·the·system·is·restarted.</p><pre><code·class="text">restart_new_emulator</code></pre><p>This·instruction·is·used·when·the·application·ERTS,·Kernel,·STDLIB,·or·SASL·is316 function·call·fails,·the·system·is·restarted.</p><pre><code·class="text">restart_new_emulator</code></pre><p>This·instruction·is·used·when·the·application·ERTS,·Kernel,·STDLIB,·or·SASL·is
317 upgraded.·It·shuts·down·the·current·emulator·and·starts·a·new·one.·All·processes317 upgraded.·It·shuts·down·the·current·emulator·and·starts·a·new·one.·All·processes
318 are·terminated·gracefully,·and·the·new·version·of·ERTS,·Kernel,·STDLIB,·and·SASL318 are·terminated·gracefully,·and·the·new·version·of·ERTS,·Kernel,·STDLIB,·and·SASL
319 are·used·when·the·emulator·restarts.·Only·one·<code·class="inline">restart_new_emulator</code>·instruction319 are·used·when·the·emulator·restarts.·Only·one·<code·class="inline">restart_new_emulator</code>·instruction
Offset 391, 15 lines modifiedOffset 391, 15 lines modified
391 ······<p·class="built-using">391 ······<p·class="built-using">
392 ········Built·using392 ········Built·using
393 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the393 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
394 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>394 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
395 ······</p>395 ······</p>
396 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>396 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
397 ····</footer>397 ····</footer>
398 ··</div>398 ··</div>
399 </main>399 </main>
400 </div>400 </div>
401 <script>401 <script>
402 ··function·mermaidLoaded()·{402 ··function·mermaidLoaded()·{
403 ····mermaid.initialize({403 ····mermaid.initialize({
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./usr/share/doc/erlang-doc/html/lib/sasl-4.2.2/doc/html/error_logging.html
    
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304 ········ok</code></pre><h3·id="show-reports"·class="section-heading">304 ········ok</code></pre><h3·id="show-reports"·class="section-heading">
305 ··<a·href="#show-reports"·class="hover-link">305 ··<a·href="#show-reports"·class="hover-link">
306 ····<i·class="ri-link-m"·aria-hidden="true"></i>306 ····<i·class="ri-link-m"·aria-hidden="true"></i>
307 ··</a>307 ··</a>
308 ··<span·class="text">Show·Reports</span>308 ··<span·class="text">Show·Reports</span>
309 </h3>309 </h3>
310 <p>Use·function·<a·href="rb.html#show/1"><code·class="inline">rb:show(Number)</code></a>·to·show·details·of·a·specific310 <p>Use·function·<a·href="rb.html#show/1"><code·class="inline">rb:show(Number)</code></a>·to·show·details·of·a·specific
311 report:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="nc">rb</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="3011443593-1">(</span><span·class="mi">4</span><span·class="p"·data-group-id="3011443593-1">)</span><span·class="p">.</span><span·class="w">311 report:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="nc">rb</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="0002936790-1">(</span><span·class="mi">4</span><span·class="p"·data-group-id="0002936790-1">)</span><span·class="p">.</span><span·class="w">
  
312 </span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="w">··</span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">···································</span><span·class="mi">1996</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">16</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">36</span><span·class="w">312 </span><span·class="n">PROGRESS</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="w">··</span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">···································</span><span·class="mi">1996</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">16</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">36</span><span·class="w">
313 </span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">=</span><span·class="w">313 </span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
314 </span><span·class="ss">supervisor</span><span·class="w">·····················································</span><span·class="p"·data-group-id="3011443593-2">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">sasl_sup</span><span·class="p"·data-group-id="3011443593-2">}</span><span·class="w">314 </span><span·class="ss">supervisor</span><span·class="w">·····················································</span><span·class="p"·data-group-id="0002936790-2">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">sasl_sup</span><span·class="p"·data-group-id="0002936790-2">}</span><span·class="w">
315 </span><span·class="ss">started</span><span·class="w">315 </span><span·class="ss">started</span><span·class="w">
316 </span><span·class="p"·data-group-id="3011443593-3">[</span><span·class="p"·data-group-id="3011443593-4">{</span><span·class="ss">pid</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.24</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·5b067e6e176f693704c9f630c1aac36b7042186e672f858d7ea650524d2bde65·...·]-4">}</span><span·class="p">,</span><span·class="w">316 </span><span·class="p"·data-group-id="0002936790-3">[</span><span·class="p"·data-group-id="0002936790-4">{</span><span·class="ss">pid</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.24</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·a3f231c85d8b6f0bbc2a3d0cd67645853bebc299b290c23ff683a8db5cb3cd22·...·]-4">}</span><span·class="p">,</span><span·class="w">
317 </span><span·class="p"·data-group-id="3011443593-5">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="ss">release_handler</span><span·class="p"·data-group-id="3011443593-5">}</span><span·class="p">,</span><span·class="w">317 </span><span·class="p"·data-group-id="0002936790-5">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="ss">release_handler</span><span·class="p"·data-group-id="0002936790-5">}</span><span·class="p">,</span><span·class="w">
318 </span><span·class="p"·data-group-id="3011443593-6">{</span><span·class="ss">mfa</span><span·class="p">,</span><span·class="p"·data-group-id="3011443593-7">{</span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="ss">start_link</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·191,·SHA:·bd6e0a815843e2219245c9c74a51272947d1248405729e391fdbfc552c702b55·...·]-6">}</span><span·class="p">,</span><span·class="w">318 </span><span·class="p"·data-group-id="0002936790-6">{</span><span·class="ss">mfa</span><span·class="p">,</span><span·class="p"·data-group-id="0002936790-7">{</span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="ss">start_link</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·191,·SHA:·f00bad983cfdfc3ead4c2e7e986b615b117a4bfb1d809fe611755db413f23f35·...·]-6">}</span><span·class="p">,</span><span·class="w">
319 </span><span·class="p"·data-group-id="3011443593-9">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="ss">permanent</span><span·class="p"·data-group-id="3011443593-9">}</span><span·class="p">,</span><span·class="w">319 </span><span·class="p"·data-group-id="0002936790-9">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="ss">permanent</span><span·class="p"·data-group-id="0002936790-9">}</span><span·class="p">,</span><span·class="w">
320 </span><span·class="p"·data-group-id="3011443593-10">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="mi">2000</span><span·class="p"·data-group-id="3011443593-10">}</span><span·class="p">,</span><span·class="w">320 </span><span·class="p"·data-group-id="0002936790-10">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="mi">2000</span><span·class="p"·data-group-id="0002936790-10">}</span><span·class="p">,</span><span·class="w">
321 </span><span·class="p"·data-group-id="3011443593-11">{</span><span·class="ss">child_type</span><span·class="p">,</span><span·class="ss">worker</span><span·class="p"·data-group-id="3011443593-11">}</span><span·class="p"·data-group-id="3011443593-3">]</span><span·class="w">321 </span><span·class="p"·data-group-id="0002936790-11">{</span><span·class="ss">child_type</span><span·class="p">,</span><span·class="ss">worker</span><span·class="p"·data-group-id="0002936790-11">}</span><span·class="p"·data-group-id="0002936790-3">]</span><span·class="w">
  
322 </span><span·class="ss">ok</span><span·class="gp·unselectable">322 </span><span·class="ss">ok</span><span·class="gp·unselectable">
323 8&gt;·</span><span·class="nc">rb</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="3011443593-12">(</span><span·class="mi">9</span><span·class="p"·data-group-id="3011443593-12">)</span><span·class="p">.</span><span·class="w">323 8&gt;·</span><span·class="nc">rb</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="0002936790-12">(</span><span·class="mi">9</span><span·class="p"·data-group-id="0002936790-12">)</span><span·class="p">.</span><span·class="w">
  
324 </span><span·class="n">CRASH</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="w">··</span><span·class="o">&lt;</span><span·class="mf">0.24</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">······································</span><span·class="mi">1996</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">16</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">21</span><span·class="w">324 </span><span·class="n">CRASH</span><span·class="w">·</span><span·class="n">REPORT</span><span·class="w">··</span><span·class="o">&lt;</span><span·class="mf">0.24</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">······································</span><span·class="mi">1996</span><span·class="o">-</span><span·class="mi">10</span><span·class="o">-</span><span·class="mi">16</span><span·class="w">·</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">16</span><span·class="p">:</span><span·class="mi">21</span><span·class="w">
325 </span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">=</span><span·class="w">325 </span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">==</span><span·class="o">=</span><span·class="w">
326 </span><span·class="n">Crashing</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">326 </span><span·class="n">Crashing</span><span·class="w">·</span><span·class="ss">process</span><span·class="w">
327 </span><span·class="ss">pid</span><span·class="w">·································································</span><span·class="o">&lt;</span><span·class="mf">0.24</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">327 </span><span·class="ss">pid</span><span·class="w">·································································</span><span·class="o">&lt;</span><span·class="mf">0.24</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">
328 </span><span·class="ss">registered_name</span><span·class="w">··············································</span><span·class="ss">release_handler</span><span·class="w">328 </span><span·class="ss">registered_name</span><span·class="w">··············································</span><span·class="ss">release_handler</span><span·class="w">
329 </span><span·class="ss">error_info</span><span·class="w">·····························</span><span·class="p"·data-group-id="3011443593-13">{</span><span·class="ss">undef</span><span·class="p">,</span><span·class="p"·data-group-id="3011443593-14">{</span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="ss">mbj_func</span><span·class="p">,</span><span·c[·...·truncated·by·diffoscope;·len:·196,·SHA:·845a33ae558dc64fe6e60a4a6de625c0541826cc620826cc6110db7e4b2d0c17·...·]-13">}</span><span·class="w">329 </span><span·class="ss">error_info</span><span·class="w">·····························</span><span·class="p"·data-group-id="0002936790-13">{</span><span·class="ss">undef</span><span·class="p">,</span><span·class="p"·data-group-id="0002936790-14">{</span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="ss">mbj_func</span><span·class="p">,</span><span·c[·...·truncated·by·diffoscope;·len:·196,·SHA:·f9088ac8daa9741b34816a9946dfb3a6f57bc4d293b327867865c32415f54ab0·...·]-13">}</span><span·class="w">
330 </span><span·class="ss">initial_call</span><span·class="w">330 </span><span·class="ss">initial_call</span><span·class="w">
331 </span><span·class="p"·data-group-id="3011443593-16">{</span><span·class="ss">gen</span><span·class="p">,</span><span·class="ss">init_it</span><span·class="p">,</span><span·class="w">331 </span><span·class="p"·data-group-id="0002936790-16">{</span><span·class="ss">gen</span><span·class="p">,</span><span·class="ss">init_it</span><span·class="p">,</span><span·class="w">
332 </span><span·class="p"·data-group-id="3011443593-17">[</span><span·class="ss">gen_server</span><span·class="p">,</span><span·class="w">332 </span><span·class="p"·data-group-id="0002936790-17">[</span><span·class="ss">gen_server</span><span·class="p">,</span><span·class="w">
333 </span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">333 </span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">
334 </span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">334 </span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="w">
335 </span><span·class="p"·data-group-id="3011443593-18">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">register</span><span·class="p"·data-group-id="3011443593-18">}</span><span·class="p">,</span><span·class="w">335 </span><span·class="p"·data-group-id="0002936790-18">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">register</span><span·class="p"·data-group-id="0002936790-18">}</span><span·class="p">,</span><span·class="w">
336 </span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="w">336 </span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="w">
337 </span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="w">337 </span><span·class="ss">release_handler</span><span·class="p">,</span><span·class="w">
338 </span><span·class="p"·data-group-id="3011443593-19">[</span><span·class="p"·data-group-id="3011443593-19">]</span><span·class="p">,</span><span·class="w">338 </span><span·class="p"·data-group-id="0002936790-19">[</span><span·class="p"·data-group-id="0002936790-19">]</span><span·class="p">,</span><span·class="w">
339 </span><span·class="p"·data-group-id="3011443593-20">[</span><span·class="p"·data-group-id="3011443593-20">]</span><span·class="p"·data-group-id="3011443593-17">]</span><span·class="p"·data-group-id="3011443593-16">}</span><span·class="w">339 </span><span·class="p"·data-group-id="0002936790-20">[</span><span·class="p"·data-group-id="0002936790-20">]</span><span·class="p"·data-group-id="0002936790-17">]</span><span·class="p"·data-group-id="0002936790-16">}</span><span·class="w">
340 </span><span·class="ss">ancestors</span><span·class="w">················································</span><span·class="p"·data-group-id="3011443593-21">[</span><span·class="ss">sasl_sup</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.18</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3011443593-21">]</span><span·class="w">340 </span><span·class="ss">ancestors</span><span·class="w">················································</span><span·class="p"·data-group-id="0002936790-21">[</span><span·class="ss">sasl_sup</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.18</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0002936790-21">]</span><span·class="w">
341 </span><span·class="ss">messages</span><span·class="w">··································································</span><span·class="p"·data-group-id="3011443593-22">[</span><span·class="p"·data-group-id="3011443593-22">]</span><span·class="w">341 </span><span·class="ss">messages</span><span·class="w">··································································</span><span·class="p"·data-group-id="0002936790-22">[</span><span·class="p"·data-group-id="0002936790-22">]</span><span·class="w">
342 </span><span·class="ss">links</span><span·class="w">····················································</span><span·class="p"·data-group-id="3011443593-23">[</span><span·class="o">&lt;</span><span·class="mf">0.23</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·94,·SHA:·cea5ed1e5d68fff526c1f86806da50724ca50290f2a19366e2588e3346f081e7·...·]-23">]</span><span·class="w">342 </span><span·class="ss">links</span><span·class="w">····················································</span><span·class="p"·data-group-id="0002936790-23">[</span><span·class="o">&lt;</span><span·class="mf">0.23</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.20</span><span·class="p">.</span[·...·truncated·by·diffoscope;·len:·94,·SHA:·0277277c505057f04a60552d72e2e35b58907dd8274f0b4163c9bab6dfadb955·...·]-23">]</span><span·class="w">
343 </span><span·class="ss">dictionary</span><span·class="w">································································</span><span·class="p"·data-group-id="3011443593-24">[</span><span·class="p"·data-group-id="3011443593-24">]</span><span·class="w">343 </span><span·class="ss">dictionary</span><span·class="w">································································</span><span·class="p"·data-group-id="0002936790-24">[</span><span·class="p"·data-group-id="0002936790-24">]</span><span·class="w">
344 </span><span·class="ss">trap_exit</span><span·class="w">······························································</span><span·class="ss">false</span><span·class="w">344 </span><span·class="ss">trap_exit</span><span·class="w">······························································</span><span·class="ss">false</span><span·class="w">
345 </span><span·class="ss">status</span><span·class="w">·······························································</span><span·class="ss">running</span><span·class="w">345 </span><span·class="ss">status</span><span·class="w">·······························································</span><span·class="ss">running</span><span·class="w">
346 </span><span·class="ss">heap_size</span><span·class="w">································································</span><span·class="mi">610</span><span·class="w">346 </span><span·class="ss">heap_size</span><span·class="w">································································</span><span·class="mi">610</span><span·class="w">
347 </span><span·class="ss">stack_size</span><span·class="w">·······························································</span><span·class="mi">142</span><span·class="w">347 </span><span·class="ss">stack_size</span><span·class="w">·······························································</span><span·class="mi">142</span><span·class="w">
348 </span><span·class="ss">reductions</span><span·class="w">································································</span><span·class="mi">54</span><span·class="w">348 </span><span·class="ss">reductions</span><span·class="w">································································</span><span·class="mi">54</span><span·class="w">
  
349 </span><span·class="ss">ok</span></code></pre><h3·id="search-reports"·class="section-heading">349 </span><span·class="ss">ok</span></code></pre><h3·id="search-reports"·class="section-heading">
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482 ········Built·using482 ········Built·using
483 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the483 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
484 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>484 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
485 ······</p>485 ······</p>
486 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>486 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
487 ····</footer>487 ····</footer>
488 ··</div>488 ··</div>
489 </main>489 </main>
490 </div>490 </div>
491 <script>491 <script>
492 ··function·mermaidLoaded()·{492 ··function·mermaidLoaded()·{
493 ····mermaid.initialize({493 ····mermaid.initialize({
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1161 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1161 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1162 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1162 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1163 ······</p>1163 ······</p>
1164 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1164 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1165 ····</footer>1165 ····</footer>
1166 ··</div>1166 ··</div>
1167 </main>1167 </main>
1168 </div>1168 </div>
1169 <script>1169 <script>
1170 ··function·mermaidLoaded()·{1170 ··function·mermaidLoaded()·{
1171 ····mermaid.initialize({1171 ····mermaid.initialize({
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1067 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1067 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
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1069 ······</p>1069 ······</p>
1070 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1070 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1071 ····</footer>1071 ····</footer>
1072 ··</div>1072 ··</div>
1073 </main>1073 </main>
1074 </div>1074 </div>
1075 <script>1075 <script>
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136 (<code·class="inline">.script</code>,·<code·class="inline">.boot</code>)·and·release·upgrade·files·(<code·class="inline">relup</code>).</p><h2·id="file-syntax"·class="section-heading">136 (<code·class="inline">.script</code>,·<code·class="inline">.boot</code>)·and·release·upgrade·files·(<code·class="inline">relup</code>).</p><h2·id="file-syntax"·class="section-heading">
137 ··<a·href="#file-syntax"·class="hover-link">137 ··<a·href="#file-syntax"·class="hover-link">
138 ····<i·class="ri-link-m"·aria-hidden="true"></i>138 ····<i·class="ri-link-m"·aria-hidden="true"></i>
139 ··</a>139 ··</a>
140 ··<span·class="text">File·Syntax</span>140 ··<span·class="text">File·Syntax</span>
141 </h2>141 </h2>
142 <p>The·release·resource·file·is·to·be·called·<code·class="inline">Name.rel</code>.</p><p>The·<code·class="inline">.rel</code>·file·contains·one·single·Erlang·term,·which·is·called·a·<em>release142 <p>The·release·resource·file·is·to·be·called·<code·class="inline">Name.rel</code>.</p><p>The·<code·class="inline">.rel</code>·file·contains·one·single·Erlang·term,·which·is·called·a·<em>release
143 specification</em>.·The·file·has·the·following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8868581414-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8868581414-2">{</span><span·class="n">RelName</span><span·class="p">,</span><span·class="n">Vsn</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·276,·SHA:·85a372107e6364cd2c89dad97b3ae464856742009e98d8e01e53901959a002c2·...·]-3">}</span><span·class="p">,</span><span·class="w">143 specification</em>.·The·file·has·the·following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5817120386-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5817120386-2">{</span><span·class="n">RelName</span><span·class="p">,</span><span·class="n">Vsn</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·276,·SHA:·39613d71266a86854d86f9f11b4d50f8764e869f8112b1c52ec5315b2662b281·...·]-3">}</span><span·class="p">,</span><span·class="w">
144 ··</span><span·class="p"·data-group-id="8868581414-4">[</span><span·class="p"·data-group-id="8868581414-5">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p"·data-group-id="8868581414-5">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">144 ··</span><span·class="p"·data-group-id="5817120386-4">[</span><span·class="p"·data-group-id="5817120386-5">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p"·data-group-id="5817120386-5">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
145 ···</span><span·class="p"·data-group-id="8868581414-6">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="8868581414-6">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">145 ···</span><span·class="p"·data-group-id="5817120386-6">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p"·data-group-id="5817120386-6">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
146 ···</span><span·class="p"·data-group-id="8868581414-7">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IncApps</span><span·class="p"·data-group-id="8868581414-7">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">146 ···</span><span·class="p"·data-group-id="5817120386-7">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">IncApps</span><span·class="p"·data-group-id="5817120386-7">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
147 ···</span><span·class="p"·data-group-id="8868581414-8">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·7610b881f0761b350e657cb903217de666fe0072b23888410dcbe45f29ca4e97·...·]-1">}</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">RelName·=·string()</code></strong>·-·Release·name.</p></li><li><p><strong><code·class="inline">Vsn·=·string()</code></strong>·-·Release·version.</p></li><li><p><strong><code·class="inline">EVsn·=·string()</code></strong>·-·ERTS·version·the·release·is·intended·for.</p></li><li><p><strong><code·class="inline">Application·=·atom()</code></strong>·-·Name·of·an·application·included·in·the·release.</p></li><li><p><strong><code·class="inline">AppVsn·=·string()</code></strong>·-·Version·of·an·application·included·in·the·release.</p></li><li><p><strong><code·class="inline">Type·=·permanent·|·transient·|·temporary·|·load·|·none</code></strong>·-·Start·type·of147 ···</span><span·class="p"·data-group-id="5817120386-8">{</span><span·class="n">Application</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AppVsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Type</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·cc1c304602a2b42471da6a60d436604744cf273199705ba262ddf3e9f43ec46c·...·]-1">}</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">RelName·=·string()</code></strong>·-·Release·name.</p></li><li><p><strong><code·class="inline">Vsn·=·string()</code></strong>·-·Release·version.</p></li><li><p><strong><code·class="inline">EVsn·=·string()</code></strong>·-·ERTS·version·the·release·is·intended·for.</p></li><li><p><strong><code·class="inline">Application·=·atom()</code></strong>·-·Name·of·an·application·included·in·the·release.</p></li><li><p><strong><code·class="inline">AppVsn·=·string()</code></strong>·-·Version·of·an·application·included·in·the·release.</p></li><li><p><strong><code·class="inline">Type·=·permanent·|·transient·|·temporary·|·load·|·none</code></strong>·-·Start·type·of
148 an·application·included·in·the·release.</p><p>If·<code·class="inline">Type·=·permanent·|·transient·|·temporary</code>,·the·application·is·loaded·and148 an·application·included·in·the·release.</p><p>If·<code·class="inline">Type·=·permanent·|·transient·|·temporary</code>,·the·application·is·loaded·and
149 started·in·the·corresponding·way,·see·<a·href="../../../../lib/kernel-10.2.6/doc/html/application.html"><code·class="inline">application</code></a>.</p><p>If·<code·class="inline">Type·=·load</code>,·the·application·is·only·loaded.</p><p>If·<code·class="inline">Type·=·none</code>,·the·application·is·not·loaded·and·not·started,·although·the149 started·in·the·corresponding·way,·see·<a·href="../../../../lib/kernel-10.2.6/doc/html/application.html"><code·class="inline">application</code></a>.</p><p>If·<code·class="inline">Type·=·load</code>,·the·application·is·only·loaded.</p><p>If·<code·class="inline">Type·=·none</code>,·the·application·is·not·loaded·and·not·started,·although·the
150 code·for·its·modules·is·loaded.</p><p>Defaults·to·<code·class="inline">permanent</code></p></li><li><p><strong><code·class="inline">IncApps·=·[atom()]</code></strong>·-·A·list·of·applications·that·are·included·by·an150 code·for·its·modules·is·loaded.</p><p>Defaults·to·<code·class="inline">permanent</code></p></li><li><p><strong><code·class="inline">IncApps·=·[atom()]</code></strong>·-·A·list·of·applications·that·are·included·by·an
151 application·included·in·the·release.·The·list·must·be·a·subset·of·the·included151 application·included·in·the·release.·The·list·must·be·a·subset·of·the·included
152 applications·specified·in·the·application·resource·file·(<code·class="inline">Application.app</code>)152 applications·specified·in·the·application·resource·file·(<code·class="inline">Application.app</code>)
153 and·overrides·this·value.·Defaults·to·the·same·value·as·in·the·application153 and·overrides·this·value.·Defaults·to·the·same·value·as·in·the·application
154 resource·file.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·list·of·applications·must·contain·the·Kernel·and·STDLIB·applications.</p></section><h2·id="see-also"·class="section-heading">154 resource·file.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·list·of·applications·must·contain·the·Kernel·and·STDLIB·applications.</p></section><h2·id="see-also"·class="section-heading">
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204 ······<p·class="built-using">204 ······<p·class="built-using">
205 ········Built·using205 ········Built·using
206 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the206 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
207 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>207 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
208 ······</p>208 ······</p>
209 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>209 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
210 ····</footer>210 ····</footer>
211 ··</div>211 ··</div>
212 </main>212 </main>
213 </div>213 </div>
214 <script>214 <script>
215 ··function·mermaidLoaded()·{215 ··function·mermaidLoaded()·{
216 ····mermaid.initialize({216 ····mermaid.initialize({
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1054 updated·(<code·class="inline">Bool==true</code>)·or·if·only·code·paths·for·modified·applications·are·to1054 updated·(<code·class="inline">Bool==true</code>)·or·if·only·code·paths·for·modified·applications·are·to
1055 be·updated·(<code·class="inline">Bool==false</code>,·default).·This·option·has·only·effect·for·other1055 be·updated·(<code·class="inline">Bool==false</code>,·default).·This·option·has·only·effect·for·other
1056 application·directories·than·the·default·<code·class="inline">$ROOT/lib/App-Vsn</code>,·that·is,1056 application·directories·than·the·default·<code·class="inline">$ROOT/lib/App-Vsn</code>,·that·is,
1057 application·directories·specified·in·argument·<code·class="inline">AppDirs</code>·in·a·call·to1057 application·directories·specified·in·argument·<code·class="inline">AppDirs</code>·in·a·call·to
1058 <a·href="#create_RELEASES/4"><code·class="inline">create_RELEASES/4</code></a>·or·<a·href="#set_unpacked/2"><code·class="inline">set_unpacked/2</code></a>.</p><p><em>Example:</em></p><p>In·the·current·version·<code·class="inline">CurVsn</code>·of·a·release,·the·application·directory·of1058 <a·href="#create_RELEASES/4"><code·class="inline">create_RELEASES/4</code></a>·or·<a·href="#set_unpacked/2"><code·class="inline">set_unpacked/2</code></a>.</p><p><em>Example:</em></p><p>In·the·current·version·<code·class="inline">CurVsn</code>·of·a·release,·the·application·directory·of
1059 <code·class="inline">myapp</code>·is·<code·class="inline">$ROOT/lib/myapp-1.0</code>.·A·new·version·<code·class="inline">NewVsn</code>·is·unpacked·outside1059 <code·class="inline">myapp</code>·is·<code·class="inline">$ROOT/lib/myapp-1.0</code>.·A·new·version·<code·class="inline">NewVsn</code>·is·unpacked·outside
1060 the·release·handler·and·the·release·handler·is·informed·about·this·with·a·call1060 the·release·handler·and·the·release·handler·is·informed·about·this·with·a·call
1061 as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">release_handler</span><span·class="p">:</span><span·class="nf">set_unpacked</span><span·class="p"·data-group-id="8846808813-1">(</span><span·class="n">RelFile</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8846808813-2">[</span><span·class="p"·data-group-id="8846808813-3">{</span><span·class="ss">myapp</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·353,·SHA:·44768e42b7028158b576a452ee9e8c23764e1e9568beef04ed5ac41c2707eff5·...·]-1">)</span><span·class="p">.</span><span·class="w">1061 as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">release_handler</span><span·class="p">:</span><span·class="nf">set_unpacked</span><span·class="p"·data-group-id="1292644908-1">(</span><span·class="n">RelFile</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1292644908-2">[</span><span·class="p"·data-group-id="1292644908-3">{</span><span·class="ss">myapp</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·353,·SHA:·7c1ff35e6c03db7778aac0d12a8c59f766317752e6b7c9bfc4b6c57897f26485·...·]-1">)</span><span·class="p">.</span><span·class="w">
1062 </span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8846808813-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">NewVsn</span><span·class="p"·data-group-id="8846808813-4">}</span></code></pre><p>If·<code·class="inline">NewVsn</code>·is·installed·with·option·<code·class="inline">{update_paths,true}</code>,·then1062 </span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1292644908-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">NewVsn</span><span·class="p"·data-group-id="1292644908-4">}</span></code></pre><p>If·<code·class="inline">NewVsn</code>·is·installed·with·option·<code·class="inline">{update_paths,true}</code>,·then
1063 <a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#lib_dir/1"><code·class="inline">code:lib_dir(myapp)</code></a>·returns·<code·class="inline">/home/user/myapp-1.0</code>.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Installing·a·new·release·can·be·time·consuming·if·there·are·many·processes·in1063 <a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#lib_dir/1"><code·class="inline">code:lib_dir(myapp)</code></a>·returns·<code·class="inline">/home/user/myapp-1.0</code>.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Installing·a·new·release·can·be·time·consuming·if·there·are·many·processes·in
1064 the·system.·The·reason·is·that·each·process·must·be·checked·for·references·to1064 the·system.·The·reason·is·that·each·process·must·be·checked·for·references·to
1065 old·code·before·a·module·can·be·purged.·This·check·can·lead·to·garbage1065 old·code·before·a·module·can·be·purged.·This·check·can·lead·to·garbage
1066 collections·and·copying·of·data.</p><p>To·speed·up·the·execution·of·<a·href="#install_release/1"><code·class="inline">install_release</code></a>,·first1066 collections·and·copying·of·data.</p><p>To·speed·up·the·execution·of·<a·href="#install_release/1"><code·class="inline">install_release</code></a>,·first
1067 call·<a·href="#check_install_release/1"><code·class="inline">check_install_release</code></a>,·using·option1067 call·<a·href="#check_install_release/1"><code·class="inline">check_install_release</code></a>,·using·option
1068 <code·class="inline">purge</code>.·This·does·the·same·check·for·old·code.·Then·purges·all·modules·that1068 <code·class="inline">purge</code>.·This·does·the·same·check·for·old·code.·Then·purges·all·modules·that
1069 can·be·soft-purged.·The·purged·modules·do·then·no·longer·have·any·old·code,1069 can·be·soft-purged.·The·purged·modules·do·then·no·longer·have·any·old·code,
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1345 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1345 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1346 ····</footer>1346 ····</footer>
1347 ··</div>1347 ··</div>
1348 </main>1348 </main>
1349 </div>1349 </div>
1350 <script>1350 <script>
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211 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>211 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
212 ····</footer>212 ····</footer>
213 ··</div>213 ··</div>
214 </main>214 </main>
215 </div>215 </div>
216 <script>216 <script>
217 ··function·mermaidLoaded()·{217 ··function·mermaidLoaded()·{
218 ····mermaid.initialize({218 ····mermaid.initialize({
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266 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>266 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
267 ····</footer>267 ····</footer>
268 ··</div>268 ··</div>
269 </main>269 </main>
270 </div>270 </div>
271 <script>271 <script>
272 ··function·mermaidLoaded()·{272 ··function·mermaidLoaded()·{
273 ····mermaid.initialize({273 ····mermaid.initialize({
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193 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>193 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
194 ····</footer>194 ····</footer>
195 ··</div>195 ··</div>
196 </main>196 </main>
197 </div>197 </div>
198 <script>198 <script>
199 ··function·mermaidLoaded()·{199 ··function·mermaidLoaded()·{
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138 files.</p><h2·id="file-syntax"·class="section-heading">138 files.</p><h2·id="file-syntax"·class="section-heading">
139 ··<a·href="#file-syntax"·class="hover-link">139 ··<a·href="#file-syntax"·class="hover-link">
140 ····<i·class="ri-link-m"·aria-hidden="true"></i>140 ····<i·class="ri-link-m"·aria-hidden="true"></i>
141 ··</a>141 ··</a>
142 ··<span·class="text">File·Syntax</span>142 ··<span·class="text">File·Syntax</span>
143 </h2>143 </h2>
144 <p>The·boot·script·is·stored·in·a·file·with·extension·<code·class="inline">.script</code>.·The·file·has·the144 <p>The·boot·script·is·stored·in·a·file·with·extension·<code·class="inline">.script</code>.·The·file·has·the
145 following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0239121329-1">{</span><span·class="ss">script</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0239121329-2">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Vsn</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·a14e192b716fc14b58cd002d64aaac3ce26ead1f5f348846899020b76d33558f·...·]-2">}</span><span·class="p">,</span><span·class="w">145 following·syntax:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0828042714-1">{</span><span·class="ss">script</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0828042714-2">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Vsn</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·d6c51258a91e616c2a19a95c88b8fe704bc396cdf222951bf237e96412dbe625·...·]-2">}</span><span·class="p">,</span><span·class="w">
146 ·</span><span·class="p"·data-group-id="0239121329-3">[</span><span·class="w">146 ·</span><span·class="p"·data-group-id="0828042714-3">[</span><span·class="w">
147 ··</span><span·class="p"·data-group-id="0239121329-4">{</span><span·class="ss">progress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loading</span><span·class="p"·data-group-id="0239121329-4">}</span><span·class="p">,</span><span·class="w">147 ··</span><span·class="p"·data-group-id="0828042714-4">{</span><span·class="ss">progress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loading</span><span·class="p"·data-group-id="0828042714-4">}</span><span·class="p">,</span><span·class="w">
148 ··</span><span·class="p"·data-group-id="0239121329-5">{</span><span·class="ss">preLoaded</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0239121329-6">[</span><span·class="n">Mod1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod2</span[·...·truncated·by·diffoscope;·len:·215,·SHA:·e3a45ca32885c0051101aa75274432be143bb15c4b058bb6334c7dc5ee9bd8db·...·]-5">}</span><span·class="p">,</span><span·class="w">148 ··</span><span·class="p"·data-group-id="0828042714-5">{</span><span·class="ss">preLoaded</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0828042714-6">[</span><span·class="n">Mod1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod2</span[·...·truncated·by·diffoscope;·len:·215,·SHA:·97569b0e38c9251eef3197b651c088683fdb9c046d430919c79bbe467e718e63·...·]-5">}</span><span·class="p">,</span><span·class="w">
149 ··</span><span·class="p"·data-group-id="0239121329-7">{</span><span·class="ss">path</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0239121329-8">[</span><span·class="n">Dir1</span><span·class="p">,</span><span·class="s">&quot;$ROOT/Dir&quot;</span><span·class[·...·truncated·by·diffoscope;·len:·179,·SHA:·ca928f29a60c2a866a7c9738f0cce6a0e9df79aa77062c899d3f22c8e56dd649·...·]-7">}</span><span·class="p">.</span><span·class="w">149 ··</span><span·class="p"·data-group-id="0828042714-7">{</span><span·class="ss">path</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0828042714-8">[</span><span·class="n">Dir1</span><span·class="p">,</span><span·class="s">&quot;$ROOT/Dir&quot;</span><span·class[·...·truncated·by·diffoscope;·len:·179,·SHA:·2d1a3ca8245a123dad7f4579976c1b6415782dcc91ec296fd686b07eaf56a647·...·]-7">}</span><span·class="p">.</span><span·class="w">
150 ··</span><span·class="p"·data-group-id="0239121329-9">{</span><span·class="ss">primLoad</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0239121329-10">[</span><span·class="n">Mod1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod2</span[·...·truncated·by·diffoscope;·len:·216,·SHA:·c5e0b7ce8814e09910f0427dcbaf8d89a4175fea2ae810e88ef0965cc8266056·...·]-9">}</span><span·class="p">,</span><span·class="w">150 ··</span><span·class="p"·data-group-id="0828042714-9">{</span><span·class="ss">primLoad</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0828042714-10">[</span><span·class="n">Mod1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod2</span[·...·truncated·by·diffoscope;·len:·216,·SHA:·8c2af3601f88fb614c4c2541724ecc5f946786ccd4c138ea36f4aa61149f6832·...·]-9">}</span><span·class="p">,</span><span·class="w">
151 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">151 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
152 ··</span><span·class="p"·data-group-id="0239121329-11">{</span><span·class="ss">kernel_load_completed</span><span·class="p"·data-group-id="0239121329-11">}</span><span·class="p">,</span><span·class="w">152 ··</span><span·class="p"·data-group-id="0828042714-11">{</span><span·class="ss">kernel_load_completed</span><span·class="p"·data-group-id="0828042714-11">}</span><span·class="p">,</span><span·class="w">
153 ··</span><span·class="p"·data-group-id="0239121329-12">{</span><span·class="ss">progress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loaded</span><span·class="p"·data-group-id="0239121329-12">}</span><span·class="p">,</span><span·class="w">153 ··</span><span·class="p"·data-group-id="0828042714-12">{</span><span·class="ss">progress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">loaded</span><span·class="p"·data-group-id="0828042714-12">}</span><span·class="p">,</span><span·class="w">
154 ··</span><span·class="p"·data-group-id="0239121329-13">{</span><span·class="ss">kernelProcess</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0239121329-14">{</span><span·class="n">Mod<[·...·truncated·by·diffoscope;·len:·251,·SHA:·255fb3af13a4e4ad6ad97f4299f6863f6a919e6402b602c14392b2249fd42999·...·]-13">}</span><span·class="p">,</span><span·class="w">154 ··</span><span·class="p"·data-group-id="0828042714-13">{</span><span·class="ss">kernelProcess</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0828042714-14">{</span><span·class="n">Mod<[·...·truncated·by·diffoscope;·len:·251,·SHA:·90d066952fcc3a80506492d757cbf2e83ce748f489d06b548b9fff90e441e281·...·]-13">}</span><span·class="p">,</span><span·class="w">
155 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">155 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
156 ··</span><span·class="p"·data-group-id="0239121329-15">{</span><span·class="nb">apply</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0239121329-16">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Func</span><s[·...·truncated·by·diffoscope;·len:·168,·SHA:·ef68e685782127a4c54ae82b44619991513ef6bdd86abba9b5a639b2222a4f0d·...·]-15">}</span><span·class="p">,</span><span·class="w">156 ··</span><span·class="p"·data-group-id="0828042714-15">{</span><span·class="nb">apply</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0828042714-16">{</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Func</span><s[·...·truncated·by·diffoscope;·len:·168,·SHA:·6cc8697c8ed3355a74a561ef50d99f8c9a7244ee272494b6872419fabb66582a·...·]-15">}</span><span·class="p">,</span><span·class="w">
157 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">157 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
158 ··</span><span·class="p"·data-group-id="0239121329-17">{</span><span·class="ss">progress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">started</span><span·class="p"·data-group-id="0239121329-17">}</span><span·class="p"·data-group-id="0239121329-3">]</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·7d402721761631e3f103bea5df572f2ae51263a2aa733288bea728870efbd4f8·...·]-1">}</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">Name·=·string()</code></strong>·-·Defines·the·system·name.</p></li><li><p><strong><code·class="inline">Vsn·=·string()</code></strong>·-·Defines·the·system·version.</p></li><li><p><strong><code·class="inline">{progress,·Term}</code></strong>·-·Sets·the·&quot;progress&quot;·of·the·initialization·program.158 ··</span><span·class="p"·data-group-id="0828042714-17">{</span><span·class="ss">progress</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">started</span><span·class="p"·data-group-id="0828042714-17">}</span><span·class="p"·data-group-id="0828042714-3">]</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·31c2a105bf3d9c9ceab1ad1e35444927ff4d8526fd024c5f5eb816249ce62785·...·]-1">}</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">Name·=·string()</code></strong>·-·Defines·the·system·name.</p></li><li><p><strong><code·class="inline">Vsn·=·string()</code></strong>·-·Defines·the·system·version.</p></li><li><p><strong><code·class="inline">{progress,·Term}</code></strong>·-·Sets·the·&quot;progress&quot;·of·the·initialization·program.
159 The·<a·href="../../../../erts-15.2.6/doc/html/init.html#get_status/0"><code·class="inline">init:get_status/0</code></a>·function·returns·the·current·value·of·the·progress,159 The·<a·href="../../../../erts-15.2.6/doc/html/init.html#get_status/0"><code·class="inline">init:get_status/0</code></a>·function·returns·the·current·value·of·the·progress,
160 which·is·<code·class="inline">{InternalStatus,Term}</code>.</p></li><li><p><strong><code·class="inline">{path,·[Dir]}</code></strong>·-·<code·class="inline">Dir</code>·is·a·string.·This·argument·sets·the·load·path·of160 which·is·<code·class="inline">{InternalStatus,Term}</code>.</p></li><li><p><strong><code·class="inline">{path,·[Dir]}</code></strong>·-·<code·class="inline">Dir</code>·is·a·string.·This·argument·sets·the·load·path·of
161 the·system·to·<code·class="inline">[Dir]</code>.·The·load·path·used·to·load·modules·is·obtained·from·the161 the·system·to·<code·class="inline">[Dir]</code>.·The·load·path·used·to·load·modules·is·obtained·from·the
162 initial·load·path,·which·is·given·in·the·script·file,·together·with·any·path162 initial·load·path,·which·is·given·in·the·script·file,·together·with·any·path
163 flags·that·were·supplied·in·the·command-line·arguments.·The·command-line163 flags·that·were·supplied·in·the·command-line·arguments.·The·command-line
164 arguments·modify·the·path·as·follows:</p><ul><li><code·class="inline">-pa·Dir1·Dir2·...·DirN</code>·adds·the·directories164 arguments·modify·the·path·as·follows:</p><ul><li><code·class="inline">-pa·Dir1·Dir2·...·DirN</code>·adds·the·directories
165 <code·class="inline">DirN,·DirN-1,·...,·Dir2,·Dir1</code>·to·the·front·of·the·initial·load·path.</li><li><code·class="inline">-pz·Dir1·Dir2·...·DirN</code>·adds·the·directories·<code·class="inline">Dir1,·Dir2,·...,·DirN</code>·to·the165 <code·class="inline">DirN,·DirN-1,·...,·Dir2,·Dir1</code>·to·the·front·of·the·initial·load·path.</li><li><code·class="inline">-pz·Dir1·Dir2·...·DirN</code>·adds·the·directories·<code·class="inline">Dir1,·Dir2,·...,·DirN</code>·to·the
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234 ······</p>234 ······</p>
235 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>235 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
236 ····</footer>236 ····</footer>
237 ··</div>237 ··</div>
238 </main>238 </main>
239 </div>239 </div>
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146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
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150 ··</div>150 ··</div>
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482 ······</p>482 ······</p>
483 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>483 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
484 ····</footer>484 ····</footer>
485 ··</div>485 ··</div>
486 </main>486 </main>
487 </div>487 </div>
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1134 ··</div>1134 ··</div>
1135 </main>1135 </main>
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147 ····</footer>147 ····</footer>
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149 </main>149 </main>
150 </div>150 </div>
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3196 ··········<pre·translate="no"><span·class="attribute">-spec</span>·print_version_info(Prefix)·->·<a·href="#t:void/0">void</a>()·when·Prefix·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>().</pre>3196 ··········<pre·translate="no"><span·class="attribute">-spec</span>·print_version_info(Prefix)·->·<a·href="#t:void/0">void</a>()·when·Prefix·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>().</pre>
  
3197 ······</div>3197 ······</div>
  
3198 <p>Utility·function(s)·to·produce·a·formatted·printout·of·the·versions·info3198 <p>Utility·function(s)·to·produce·a·formatted·printout·of·the·versions·info
3199 generated·by·the·<code·class="inline">versions1</code>·function</p><p>This·is·the·same·as·doing,·e.g.:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">···········</span><span·class="p"·data-group-id="0777050905-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V</span><span·class="p"·data-group-id="0777050905-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·168,·SHA:·fc18ecd960512bf3652ddb6bbb238fe6033a0c092749cf9073484398f7eff3ef·...·]-2">)</span><span·class="p">,</span><span·class="w">3199 generated·by·the·<code·class="inline">versions1</code>·function</p><p>This·is·the·same·as·doing,·e.g.:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">···········</span><span·class="p"·data-group-id="1128022490-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V</span><span·class="p"·data-group-id="1128022490-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·168,·SHA:·70cca1d9efb8944cb1b6bbc86b509efa41a37ce3fb5a375a7d5f4c64d1893c94·...·]-2">)</span><span·class="p">,</span><span·class="w">
3200 ···········</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">print_versions</span><span·class="p"·data-group-id="0777050905-3">(</span><span·class="n">V</span><span·class="p"·data-group-id="0777050905-3">)</span><span·class="p">.</span></code></pre>3200 ···········</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">print_versions</span><span·class="p"·data-group-id="1128022490-3">(</span><span·class="n">V</span><span·class="p"·data-group-id="1128022490-3">)</span><span·class="p">.</span></code></pre>
3201 ··</section>3201 ··</section>
3202 </section>3202 </section>
3203 <section·class="detail"·id="print_versions/1">3203 <section·class="detail"·id="print_versions/1">
  
3204 ··<div·class="detail-header">3204 ··<div·class="detail-header">
3205 ····<a·href="#print_versions/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3205 ····<a·href="#print_versions/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3206 ······<i·class="ri-link-m"·aria-hidden="true"></i>3206 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 3253, 16 lines modifiedOffset 3253, 16 lines modified
3253 ····························Prefix·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),3253 ····························Prefix·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),
3254 ····························Versions·::·[VersionInfo],3254 ····························Versions·::·[VersionInfo],
3255 ····························VersionInfo·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>3255 ····························VersionInfo·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
3256 ······</div>3256 ······</div>
  
3257 <p>Utility·function·to·produce·a·formatted·printout·of·the·versions·info·generated3257 <p>Utility·function·to·produce·a·formatted·printout·of·the·versions·info·generated
3258 by·the·<code·class="inline">versions1</code>·and·<code·class="inline">versions2</code>·functions</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">···········</span><span·class="p"·data-group-id="2992020706-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V</span><span·class="p"·data-group-id="2992020706-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">versions1</span><span·class="p"·data-group-id="2992020706-2">(</span><span·class="p"·data-group-id="2992020706-2">)</span><span·class="p">,</span><span·class="w"> 
3259 ···········</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">print_versions</span><span·class="p"·data-group-id="2992020706-3">(</span><span·class="n">V</span><span·class="p"·data-group-id="2992020706-3">)</span><span·class="p">.<[·...·truncated·by·diffoscope;·len:·18,·SHA:·aa6285803019735a1e142dd0f052e377f4e11767187e5c1060f3bd4bfb9428ac·...·]>3258 by·the·<code·class="inline">versions1</code>·and·<code·class="inline">versions2</code>·functions</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">···········</span><span·class="p"·data-group-id="0497283948-1">{</span><span·[·...·truncated·by·diffoscope;·len:·447,·SHA:·1193770501bbfac4e6fd7b22e1d36d34cc96ac9d3450091fb6eea9bbd980101c·...·]>
 3259 ···········</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">print_versions</span><span·class="p"·data-group-id="0497283948-3">(</span><span·class="n">V</span><span·class="p"·data-group-id="0497283948-3">)</span><span·class="p">.</span></code></pre>
3260 ··</section>3260 ··</section>
3261 </section>3261 </section>
3262 <section·class="detail"·id="read_mib/1">3262 <section·class="detail"·id="read_mib/1">
  
3263 ··<div·class="detail-header">3263 ··<div·class="detail-header">
3264 ····<a·href="#read_mib/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3264 ····<a·href="#read_mib/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3265 ······<i·class="ri-link-m"·aria-hidden="true"></i>3265 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 3382, 25 lines modifiedOffset 3382, 25 lines modified
3382 ·······················TraceOpt·::·{timestamp,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()}·|·TargetOpt.</pre>3382 ·······················TraceOpt·::·{timestamp,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()}·|·TargetOpt.</pre>
  
3383 ······</div>3383 ······</div>
  
3384 <p>This·function·is·used·to·set·up·trace·on·function(s)·for·the·given·module·or3384 <p>This·function·is·used·to·set·up·trace·on·function(s)·for·the·given·module·or
3385 modules.</p><p>The·example·below·sets·up·trace·on·the·exported·functions·(default)·of·module3385 modules.</p><p>The·example·below·sets·up·trace·on·the·exported·functions·(default)·of·module
3386 <code·class="inline">snmp_generic</code>·and·all·functions·of·module·<code·class="inline">snmp_generic_mnesia</code>.·With·return3386 <code·class="inline">snmp_generic</code>·and·all·functions·of·module·<code·class="inline">snmp_generic_mnesia</code>.·With·return
3387 values·(which·is·default)·and·timestamps·in·both·cases·(which·is·also·default):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»    ··</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">enable_trace</span><span·class="p"·data-group-id="1763578041-1">(</span><span·class="p"·data-group-id="1763578041-1">)</span><span·class="p">,</span><span·class="w">3387 values·(which·is·default)·and·timestamps·in·both·cases·(which·is·also·default):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»    ··</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">enable_trace</span><span·class="p"·data-group-id="1562668746-1">(</span><span·class="p"·data-group-id="1562668746-1">)</span><span·class="p">,</span><span·class="w">
3388 »       ··</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">set_trace</span><span·class="p"·data-group-id="1763578041-2">(</span><span·class="p"·data-group-id="1763578041-3">[</span><span·class="ss">snmp_generic</span><span·class="p">,</span><span·class="w">3388 »       ··</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">set_trace</span><span·class="p"·data-group-id="1562668746-2">(</span><span·class="p"·data-group-id="1562668746-3">[</span><span·class="ss">snmp_generic</span><span·class="p">,</span><span·class="w">
3389 ··························</span><span·class="p"·data-group-id="1763578041-4">{</span><span·class="ss">snmp_generic_mnesia</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1763578041-5">[</span><span·class="p"·data-group-id="1763578041-6">{</span><span·class="ss">scope</span><span·cla[·...·truncated·by·diffoscope;·len:·329,·SHA:·7f1922aea6b65651adfd9937731206cd4c5c5a32774a6daefb04b23b26062159·...·]-2">)</span><span·class="p">,</span><span·class="w">3389 ··························</span><span·class="p"·data-group-id="1562668746-4">{</span><span·class="ss">snmp_generic_mnesia</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1562668746-5">[</span><span·class="p"·data-group-id="1562668746-6">{</span><span·class="ss">scope</span><span·cla[·...·truncated·by·diffoscope;·len:·329,·SHA:·24ed7aa9ea41fb9da6faf226c1677b63066b041a2dd018efa94503e9c75c0171·...·]-2">)</span><span·class="p">,</span><span·class="w">
3390 »       ··</span><span·class="p">.</span><span·class="w">3390 »       ··</span><span·class="p">.</span><span·class="w">
3391 »       ··</span><span·class="p">.</span><span·class="w">3391 »       ··</span><span·class="p">.</span><span·class="w">
3392 »       ··</span><span·class="p">.</span><span·class="w">3392 »       ··</span><span·class="p">.</span><span·class="w">
3393 ··········</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">set_trace</span><span·class="p"·data-group-id="1763578041-7">(</span><span·class="ss">snmp_generic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disable</span><span·class="p"·data-group-id="1763578041-7">)</span><span·class="p">,</span><span·class="w">3393 ··········</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">set_trace</span><span·class="p"·data-group-id="1562668746-7">(</span><span·class="ss">snmp_generic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disable</span><span·class="p"·data-group-id="1562668746-7">)</span><span·class="p">,</span><span·class="w">
3394 »       ··</span><span·class="p">.</span><span·class="w">3394 »       ··</span><span·class="p">.</span><span·class="w">
3395 »       ··</span><span·class="p">.</span><span·class="w">3395 »       ··</span><span·class="p">.</span><span·class="w">
3396 »       ··</span><span·class="p">.</span><span·class="w">3396 »       ··</span><span·class="p">.</span><span·class="w">
3397 »       ··</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">disable_trace</span><span·class="p"·data-group-id="1763578041-8">(</span><span·class="p"·data-group-id="1763578041-8">)</span><span·class="p">,</span></code></pre>3397 »       ··</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">disable_trace</span><span·class="p"·data-group-id="1562668746-8">(</span><span·class="p"·data-group-id="1562668746-8">)</span><span·class="p">,</span></code></pre>
3398 ··</section>3398 ··</section>
3399 </section>3399 </section>
3400 <section·class="detail"·id="start/0">3400 <section·class="detail"·id="start/0">
  
3401 ··<div·class="detail-header">3401 ··<div·class="detail-header">
3402 ····<a·href="#start/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3402 ····<a·href="#start/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3403 ······<i·class="ri-link-m"·aria-hidden="true"></i>3403 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 3762, 15 lines modifiedOffset 3762, 15 lines modified
3762 ······<p·class="built-using">3762 ······<p·class="built-using">
3763 ········Built·using3763 ········Built·using
3764 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3764 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
3765 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>3765 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
3766 ······</p>3766 ······</p>
3767 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3767 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3768 ····</footer>3768 ····</footer>
3769 ··</div>3769 ··</div>
3770 </main>3770 </main>
3771 </div>3771 </div>
3772 <script>3772 <script>
3773 ··function·mermaidLoaded()·{3773 ··function·mermaidLoaded()·{
3774 ····mermaid.initialize({3774 ····mermaid.initialize({
631 B
html2text {}
Max HTML report size reached
31.5 KB
./usr/share/doc/erlang-doc/html/lib/snmp-5.18.2/doc/html/snmp_advanced_agent.html
    
Offset 325, 74 lines modifiedOffset 325, 74 lines modified
325 ·······::=·{·empTable·1·}325 ·······::=·{·empTable·1·}
326 ·······EmpEntry·::=326 ·······EmpEntry·::=
327 ··············SEQUENCE·{327 ··············SEQUENCE·{
328 ··················empDepNo·········INTEGER,328 ··················empDepNo·········INTEGER,
329 ··················empName··········DisplayString,329 ··················empName··········DisplayString,
330 ··················empTelNo·········DisplayString,330 ··················empTelNo·········DisplayString,
331 ··················empStatus········RowStatus331 ··················empStatus········RowStatus
332 ··············}</code></pre><p>The·corresponding·Mnesia·table·is·specified·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="3865429533-1">(</span><span·class="p"·data-group-id="3865429533-2">[</span><span·class="p"·data-group-id="3865429533-3">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">employees</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·c44cd100d68d3c8501013257128136ddf86067faf0d74fab12cb70e088bec45e·...·]-3">}</span><span·class="p">,</span><span·class="w">332 ··············}</code></pre><p>The·corresponding·Mnesia·table·is·specified·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="6700366661-1">(</span><span·class="p"·data-group-id="6700366661-2">[</span><span·class="p"·data-group-id="6700366661-3">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">employees</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·55031e073b1b068e5400fcdc8dce4e5e6c37a88fd949ee645ab4eb30b79bbe1c·...·]-3">}</span><span·class="p">,</span><span·class="w">
333 ·····················</span><span·class="p"·data-group-id="3865429533-4">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3865429533-5">[</span><span·class="p"·data-group-id="3865429533-6">{</span><span·class="ss">key</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·385,·SHA:·f1f3ffebd01757a0c92d24ebdf92fd3c59ddda4c24ac2456d961e1947a95ed72·...·]-4">}</span><span·class="p">,</span><span·class="w">333 ·····················</span><span·class="p"·data-group-id="6700366661-4">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6700366661-5">[</span><span·class="p"·data-group-id="6700366661-6">{</span><span·class="ss">key</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·385,·SHA:·c7597a689c8cc1352326e83f437cfd43ac24d93323f091555e26f3a685dd78b3·...·]-4">}</span><span·class="p">,</span><span·class="w">
334 ·····················</span><span·class="p"·data-group-id="3865429533-8">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3865429533-9">[</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">telno</[·...·truncated·by·diffoscope;·len:·287,·SHA:·b9079293c8b47123d9ac83eb41066e580c1e9c9e0ea327312a33851e20bb35d3·...·]-1">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>In·the·Mnesia·tables,·the·two·key·columns·are·stored·as·a·tuple·with·two334 ·····················</span><span·class="p"·data-group-id="6700366661-8">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6700366661-9">[</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">telno</[·...·truncated·by·diffoscope;·len:·287,·SHA:·e901872ce875767845d836729132236b186f122987336654b319f479b0bd8069·...·]-1">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>In·the·Mnesia·tables,·the·two·key·columns·are·stored·as·a·tuple·with·two
335 elements.·Therefore,·the·arity·of·the·table·is·3.</p></section><h3·id="instrumentation-functions"·class="section-heading">335 elements.·Therefore,·the·arity·of·the·table·is·3.</p></section><h3·id="instrumentation-functions"·class="section-heading">
336 ··<a·href="#instrumentation-functions"·class="hover-link">336 ··<a·href="#instrumentation-functions"·class="hover-link">
337 ····<i·class="ri-link-m"·aria-hidden="true"></i>337 ····<i·class="ri-link-m"·aria-hidden="true"></i>
338 ··</a>338 ··</a>
339 ··<span·class="text">Instrumentation·Functions</span>339 ··<span·class="text">Instrumentation·Functions</span>
340 </h3>340 </h3>
341 <p>The·MIB·table·shown·in·the·previous·section·can·be·compiled·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="0651660721-1">(</span><span·class="s">&quot;EmpMIB&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0651660721-2">[</span><span·class="p"·data-group-id="0651660721-3">{</span><span·class="ss">db</span><span·class="[·...·truncated·by·diffoscope;·len:·212,·SHA:·6e2f9aa68e31cfbdcd7f367c5da3e6481fbaa9542a5d02286c694be49ef9d262·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·is·all·that·has·to·be·done!·Now·the·manager·can·read,·add,·and·modify341 <p>The·MIB·table·shown·in·the·previous·section·can·be·compiled·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="6603768188-1">(</span><span·class="s">&quot;EmpMIB&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6603768188-2">[</span><span·class="p"·data-group-id="6603768188-3">{</span><span·class="ss">db</span><span·class="[·...·truncated·by·diffoscope;·len:·212,·SHA:·ca258b6ef526392e60042563a800266e9e50c15b1cbe8efd9a2cd1f390f53282·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·is·all·that·has·to·be·done!·Now·the·manager·can·read,·add,·and·modify
342 rows.·Also,·you·can·use·the·ordinary·Mnesia·API·to·access·the·table·from·your342 rows.·Also,·you·can·use·the·ordinary·Mnesia·API·to·access·the·table·from·your
343 programs.·The·only·explicit·action·is·to·create·the·Mnesia·table,·an·action·the343 programs.·The·only·explicit·action·is·to·create·the·Mnesia·table,·an·action·the
344 user·has·to·perform·in·order·to·create·the·required·table·schemas.</p><h3·id="adding-own-actions"·class="section-heading">344 user·has·to·perform·in·order·to·create·the·required·table·schemas.</p><h3·id="adding-own-actions"·class="section-heading">
345 ··<a·href="#adding-own-actions"·class="hover-link">345 ··<a·href="#adding-own-actions"·class="hover-link">
346 ····<i·class="ri-link-m"·aria-hidden="true"></i>346 ····<i·class="ri-link-m"·aria-hidden="true"></i>
347 ··</a>347 ··</a>
348 ··<span·class="text">Adding·Own·Actions</span>348 ··<span·class="text">Adding·Own·Actions</span>
349 </h3>349 </h3>
350 <p>It·is·often·necessary·to·take·some·specific·action·when·a·table·is·modified.350 <p>It·is·often·necessary·to·take·some·specific·action·when·a·table·is·modified.
351 This·is·accomplished·with·an·instrumentation·function.·It·executes·some·specific351 This·is·accomplished·with·an·instrumentation·function.·It·executes·some·specific
352 code·when·the·table·is·set,·and·passes·all·other·requests·down·to·the352 code·when·the·table·is·set,·and·passes·all·other·requests·down·to·the
353 pre-defined·function.</p><p>The·following·example·illustrates·this·idea:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">emp_table</span><span·class="p"·data-group-id="6589433088-1">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="6589433088-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">353 pre-defined·function.</p><p>The·following·example·illustrates·this·idea:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">emp_table</span><span·class="p"·data-group-id="2504723204-1">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="2504723204-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
354 ····</span><span·class="nf">notify_internal_resources</span><span·class="p"·data-group-id="6589433088-2">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="6589433088-2">)</span><span·class="p">,</span><span·class="w">354 ····</span><span·class="nf">notify_internal_resources</span><span·class="p"·data-group-id="2504723204-2">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="2504723204-2">)</span><span·class="p">,</span><span·class="w">
355 ····</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="6589433088-3">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·252,·SHA:·68b579126a6b79d9e358d3b46eafbccb2e3ce70376db2453de97713ba1f15283·...·]-3">)</span><span·class="p">;</span><span·class="w">355 ····</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="2504723204-3">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·252,·SHA:·c275dabd6bff6e2f27cff66d383aefe2c2a7a30fae8bf2327c764743bac72ac5·...·]-3">)</span><span·class="p">;</span><span·class="w">
356 </span><span·class="nf">emp_table</span><span·class="p"·data-group-id="6589433088-5">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="6589433088-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">356 </span><span·class="nf">emp_table</span><span·class="p"·data-group-id="2504723204-5">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="2504723204-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
357 ····</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="6589433088-6">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·250,·SHA:·d59883212eb050b68e04262a98475374889a1cbdff5ce06bf6b2bd44a376d277·...·]-6">)</span><span·class="p">.</span></code></pre><p>The·default·instrumentation·functions·are·defined·in·the·module·<code·class="inline">snmp_generic</code>.357 ····</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="2504723204-6">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·250,·SHA:·e0bbd9228c6d6ddafe6031dbeadc7138387fad772602963f677b4b84ac03f02c·...·]-6">)</span><span·class="p">.</span></code></pre><p>The·default·instrumentation·functions·are·defined·in·the·module·<code·class="inline">snmp_generic</code>.
358 Refer·to·the·Reference·Manual,·section·SNMP,·module·<code·class="inline">snmp_generic</code>·for·details.</p><h3·id="extending-the-mnesia-table"·class="section-heading">358 Refer·to·the·Reference·Manual,·section·SNMP,·module·<code·class="inline">snmp_generic</code>·for·details.</p><h3·id="extending-the-mnesia-table"·class="section-heading">
359 ··<a·href="#extending-the-mnesia-table"·class="hover-link">359 ··<a·href="#extending-the-mnesia-table"·class="hover-link">
360 ····<i·class="ri-link-m"·aria-hidden="true"></i>360 ····<i·class="ri-link-m"·aria-hidden="true"></i>
361 ··</a>361 ··</a>
362 ··<span·class="text">Extending·the·Mnesia·Table</span>362 ··<span·class="text">Extending·the·Mnesia·Table</span>
363 </h3>363 </h3>
364 <p>A·table·may·contain·columns·that·are·used·internally,·but·should·not·be·visible364 <p>A·table·may·contain·columns·that·are·used·internally,·but·should·not·be·visible
365 to·a·manager.·These·internal·columns·must·be·the·last·columns·in·the·table.·The365 to·a·manager.·These·internal·columns·must·be·the·last·columns·in·the·table.·The
366 <code·class="inline">set</code>·operation·will·not·work·with·this·arrangement,·because·there·are·columns366 <code·class="inline">set</code>·operation·will·not·work·with·this·arrangement,·because·there·are·columns
367 that·the·agent·does·not·know·about.·This·situation·is·handled·by·adding·values367 that·the·agent·does·not·know·about.·This·situation·is·handled·by·adding·values
368 for·the·internal·columns·in·the·<code·class="inline">set</code>·function.</p><p>To·illustrate·this,·suppose·we·extend·our·Mnesia·<code·class="inline">empTable</code>·with·one·internal368 for·the·internal·columns·in·the·<code·class="inline">set</code>·function.</p><p>To·illustrate·this,·suppose·we·extend·our·Mnesia·<code·class="inline">empTable</code>·with·one·internal
369 column.·We·create·it·as·before,·but·with·an·arity·of·4,·by·adding·another369 column.·We·create·it·as·before,·but·with·an·arity·of·4,·by·adding·another
370 attribute.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="8175527215-1">(</span><span·class="p"·data-group-id="8175527215-2">[</span><span·class="p"·data-group-id="8175527215-3">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">employees</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·a09a4a45621468091b0615c3fe8904ab2dea1ed1f20990110d13ddd40b860baa·...·]-3">}</span><span·class="p">,</span><span·class="w">370 attribute.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">mnesia</span><span·class="p">:</span><span·class="nf">create_table</span><span·class="p"·data-group-id="6421774829-1">(</span><span·class="p"·data-group-id="6421774829-2">[</span><span·class="p"·data-group-id="6421774829-3">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">employees</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·da03f844d5c6e9cee3026df6fe58bed045003b5bddfab47ee56c691e083aff0f·...·]-3">}</span><span·class="p">,</span><span·class="w">
371 ·····················</span><span·class="p"·data-group-id="8175527215-4">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8175527215-5">[</span><span·class="p"·data-group-id="8175527215-6">{</span><span·class="ss">key</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·385,·SHA:·5ae34ab3f2037f0ce5a866c4d04d96595c383be83543329f5b415ea79f57bdb7·...·]-4">}</span><span·class="p">,</span><span·class="w">371 ·····················</span><span·class="p"·data-group-id="6421774829-4">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6421774829-5">[</span><span·class="p"·data-group-id="6421774829-6">{</span><span·class="ss">key</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·385,·SHA:·7d7b9b6853b00e15e521e263f263c54c22ca09a7b5f1755ad3bc01ce80feb03c·...·]-4">}</span><span·class="p">,</span><span·class="w">
372 ·····················</span><span·class="p"·data-group-id="8175527215-8">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8175527215-9">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">telno</[·...·truncated·by·diffoscope;·len:·371,·SHA:·02843d239c90f067beffa32482b47ff6c2c28e7d1d4dda6a101bc49ea74f67e7·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·last·column·is·the·internal·column.·When·performing·a·<code·class="inline">set</code>·operation,·which372 ·····················</span><span·class="p"·data-group-id="6421774829-8">{</span><span·class="ss">attributes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6421774829-9">{</span><span·class="ss">key</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">telno</[·...·truncated·by·diffoscope;·len:·371,·SHA:·d5ca8db1db74b9af0bd7419ce67000331751f49a1cf4f626864558235d42d483·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·last·column·is·the·internal·column.·When·performing·a·<code·class="inline">set</code>·operation,·which
373 creates·a·row,·we·must·give·a·value·to·the·internal·column.·The·instrumentation373 creates·a·row,·we·must·give·a·value·to·the·internal·column.·The·instrumentation
374 functions·will·now·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="9896496198-1">(</span><span·class="ss">createAndGo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="9896496198-1">)</span><span·class="p">.</span><span·class="w">374 functions·will·now·look·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="8728849494-1">(</span><span·class="ss">createAndGo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="8728849494-1">)</span><span·class="p">.</span><span·class="w">
375 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="9896496198-2">(</span><span·class="ss">createAndWait</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="9896496198-2">)</span><span·class="p">.</span><span·class="w">375 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="8728849494-2">(</span><span·class="ss">createAndWait</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="8728849494-2">)</span><span·class="p">.</span><span·class="w">
  
376 </span><span·class="nf">emp_table</span><span·class="p"·data-group-id="9896496198-3">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="9896496198-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">376 </span><span·class="nf">emp_table</span><span·class="p"·data-group-id="8728849494-3">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="8728849494-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
377 ··</span><span·class="nf">notify_internal_resources</span><span·class="p"·data-group-id="9896496198-4">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="9896496198-4">)</span><span·class="p">,</span><span·class="w">377 ··</span><span·class="nf">notify_internal_resources</span><span·class="p"·data-group-id="8728849494-4">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="8728849494-4">)</span><span·class="p">,</span><span·class="w">
378 ··</span><span·class="n">NewCols</span><span·class="w">·</span><span·class="o">=</span><span·class="w">378 ··</span><span·class="n">NewCols</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
379 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">is_row_created</span><span·class="p"·data-group-id="9896496198-5">(</span><span·class="ss">empTable</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="9896496198-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">379 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">is_row_created</span><span·class="p"·data-group-id="8728849494-5">(</span><span·class="ss">empTable</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="8728849494-5">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
380 ······</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Cols</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="9896496198-6">[</span><span·class="p"·data-group-id="9896496198-7">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;internal&quot;</span><span·class="p"·data-group-id="9896496198-7">}</span><span·class=[·...·truncated·by·diffoscope;·len:·29,·SHA:·dc4da099d027fe48d1a898228218d26a91e2222a2c0d9b1b943577496ae74902·...·]-6">]</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·add·internal·column</span><span·class="w">380 ······</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Cols</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="8728849494-6">[</span><span·class="p"·data-group-id="8728849494-7">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;internal&quot;</span><span·class="p"·data-group-id="8728849494-7">}</span><span·class=[·...·truncated·by·diffoscope;·len:·29,·SHA:·8af23347e98bc862ae539d09ee9d5d3abeffee15722f5247ad1459efa453d0a3·...·]-6">]</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·add·internal·column</span><span·class="w">
381 ······</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Cols</span><span·class="w">······················</span><span·class="c1">%·keep·original·cols</span><span·class="w">381 ······</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Cols</span><span·class="w">······················</span><span·class="c1">%·keep·original·cols</span><span·class="w">
382 ··</span><span·class="k">end</span><span·class="p">,</span><span·class="w">382 ··</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
383 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="9896496198-8">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewCols</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·255,·SHA:·edfdb5e403b0b410527751d0b6799b71ad09451de6c8698d0d475b93571820d4·...·]-8">)</span><span·class="p">;</span><span·class="w">383 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="8728849494-8">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewCols</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·255,·SHA:·eca71450d2096021be38b06619097a3a923eb77f1a50d2f49a790e05c73702af·...·]-8">)</span><span·class="p">;</span><span·class="w">
384 </span><span·class="nf">emp_table</span><span·class="p"·data-group-id="9896496198-10">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="9896496198-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">384 </span><span·class="nf">emp_table</span><span·class="p"·data-group-id="8728849494-10">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="8728849494-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
385 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="9896496198-11">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·253,·SHA:·47d6359089378c55cd67fcea2b9f8857be57e47d48338e333b9cadcda46caef7·...·]-11">)</span><span·class="p">.</span><span·class="w">385 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="8728849494-11">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·253,·SHA:·65a211c23ac0f1d2243a0210cb9c39ca861b24cec3c6d40aaec48bfb6881f52a·...·]-11">)</span><span·class="p">.</span><span·class="w">
  
386 </span><span·class="nf">is_row_created</span><span·class="p"·data-group-id="9896496198-13">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="9896496198-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">386 </span><span·class="nf">is_row_created</span><span·class="p"·data-group-id="8728849494-13">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="8728849494-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
387 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">get_status_col</span><span·class="p"·data-group-id="9896496198-14">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="9896496198-14">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">387 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">get_status_col</span><span·class="p"·data-group-id="8728849494-14">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="8728849494-14">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
388 ····</span><span·class="p"·data-group-id="9896496198-15">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">createAndGo</span><span·class="p"·data-group-id="9896496198-15">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">388 ····</span><span·class="p"·data-group-id="8728849494-15">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">createAndGo</span><span·class="p"·data-group-id="8728849494-15">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
389 ····</span><span·class="p"·data-group-id="9896496198-16">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">createAndWait</span><span·class="p"·data-group-id="9896496198-16">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">389 ····</span><span·class="p"·data-group-id="8728849494-16">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="ss">createAndWait</span><span·class="p"·data-group-id="8728849494-16">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">;</span><span·class="w">
390 ····</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">390 ····</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">false</span><span·class="w">
391 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>If·a·row·is·created,·we·always·set·the·internal·column·to·<code·class="inline">&quot;internal&quot;</code>.</p><h2·id="deviations-from-the-standard"·class="section-heading">391 ··</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>If·a·row·is·created,·we·always·set·the·internal·column·to·<code·class="inline">&quot;internal&quot;</code>.</p><h2·id="deviations-from-the-standard"·class="section-heading">
392 ··<a·href="#deviations-from-the-standard"·class="hover-link">392 ··<a·href="#deviations-from-the-standard"·class="hover-link">
393 ····<i·class="ri-link-m"·aria-hidden="true"></i>393 ····<i·class="ri-link-m"·aria-hidden="true"></i>
394 ··</a>394 ··</a>
395 ··<span·class="text">Deviations·from·the·Standard</span>395 ··<span·class="text">Deviations·from·the·Standard</span>
396 </h2>396 </h2>
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456 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>456 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
457 ······</p>457 ······</p>
458 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>458 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
459 ····</footer>459 ····</footer>
460 ··</div>460 ··</div>
461 </main>461 </main>
462 </div>462 </div>
463 <script>463 <script>
464 ··function·mermaidLoaded()·{464 ··function·mermaidLoaded()·{
465 ····mermaid.initialize({465 ····mermaid.initialize({
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147 ··</a>147 ··</a>
148 ··<span·class="text">Agent·Information</span>148 ··<span·class="text">Agent·Information</span>
149 </h2>149 </h2>
150 <p>The·agent·information·should·be·stored·in·a·file·called·<code·class="inline">agent.conf</code>.</p><p>Each·entry·is·a·tuple·of·size·two:</p><p><code·class="inline">{AgentVariable,·Value}.</code></p><ul><li><code·class="inline">AgentVariable</code>·is·one·of·the·variables·in·SNMP-FRAMEWORK-MIB·or·one·of·the150 <p>The·agent·information·should·be·stored·in·a·file·called·<code·class="inline">agent.conf</code>.</p><p>Each·entry·is·a·tuple·of·size·two:</p><p><code·class="inline">{AgentVariable,·Value}.</code></p><ul><li><code·class="inline">AgentVariable</code>·is·one·of·the·variables·in·SNMP-FRAMEWORK-MIB·or·one·of·the
151 internal·variables·<code·class="inline">intAgentUDPPort</code>,·which·defines·which·UDP·port·the·agent151 internal·variables·<code·class="inline">intAgentUDPPort</code>,·which·defines·which·UDP·port·the·agent
152 listens·to,·or·<code·class="inline">intAgentTransports</code>,·which·defines·the·transport·domains·and152 listens·to,·or·<code·class="inline">intAgentTransports</code>,·which·defines·the·transport·domains·and
153 addresses·of·the·agent.</li><li><code·class="inline">Value</code>·is·the·value·for·the·variable.</li></ul><p>The·following·example·shows·an·<code·class="inline">agent.conf</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5853764579-1">{</span><span·class="ss">intAgentUDPPort</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4000</span><span·class="p"·data-group-id="5853764579-1">}</span><span·class="p">.</span><span·class="w">153 addresses·of·the·agent.</li><li><code·class="inline">Value</code>·is·the·value·for·the·variable.</li></ul><p>The·following·example·shows·an·<code·class="inline">agent.conf</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7916397106-1">{</span><span·class="ss">intAgentUDPPort</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4000</span><span·class="p"·data-group-id="7916397106-1">}</span><span·class="p">.</span><span·class="w">
154 </span><span·class="p"·data-group-id="5853764579-2">{</span><span·class="ss">intAgentTransports</span><span·class="p">,</span><span·class="w">154 </span><span·class="p"·data-group-id="7916397106-2">{</span><span·class="ss">intAgentTransports</span><span·class="p">,</span><span·class="w">
155 ·</span><span·class="p"·data-group-id="5853764579-3">[</span><span·class="p"·data-group-id="5853764579-4">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5853764579-5">{</span><span·class="mi">141</span><span·c[·...·truncated·by·diffoscope;·len:·238,·SHA:·bafe78af655aa34eccaf59b42d06e76e258d3cb82fd3e50f295a54fd3c9a39ac·...·]-4">}</span><span·class="p">,</span><span·class="w">155 ·</span><span·class="p"·data-group-id="7916397106-3">[</span><span·class="p"·data-group-id="7916397106-4">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7916397106-5">{</span><span·class="mi">141</span><span·c[·...·truncated·by·diffoscope;·len:·238,·SHA:·5c41b7d2d52baf7c4e672479cfe74ced226e803d889e6c4b941e27e78f1ea824·...·]-4">}</span><span·class="p">,</span><span·class="w">
156 ··</span><span·class="p"·data-group-id="5853764579-6">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5853764579-7">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·481,·SHA:·9468cd2bf77a1021d7bd44197cfb5744f934a70e359cab883833d1ad95f0ec25·...·]-2">}</span><span·class="p">.</span><span·class="w">156 ··</span><span·class="p"·data-group-id="7916397106-6">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7916397106-7">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·481,·SHA:·daf269520583506007ad0d429ef589a5a509c578faadfe782e189b1fcc3515f9·...·]-2">}</span><span·class="p">.</span><span·class="w">
157 </span><span·class="p"·data-group-id="5853764579-8">{</span><span·class="ss">snmpEngineID</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;mbj&#39;s·engine&quot;</span><span·class="p"·data-group-id="5853764579-8">}</span><span·class="p">.</span><span·class="w">157 </span><span·class="p"·data-group-id="7916397106-8">{</span><span·class="ss">snmpEngineID</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;mbj&#39;s·engine&quot;</span><span·class="p"·data-group-id="7916397106-8">}</span><span·class="p">.</span><span·class="w">
158 </span><span·class="p"·data-group-id="5853764579-9">{</span><span·class="ss">snmpEngineMaxMessageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">484</span><span·class="p"·data-group-id="5853764579-9">}</span><span·class="p">.</span></code></pre><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">158 </span><span·class="p"·data-group-id="7916397106-9">{</span><span·class="ss">snmpEngineMaxMessageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">484</span><span·class="p"·data-group-id="7916397106-9">}</span><span·class="p">.</span></code></pre><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
159 </span><span·class="n">AgentPort</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4000</span><span·class="p">,</span><span·class="w">159 </span><span·class="n">AgentPort</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4000</span><span·class="p">,</span><span·class="w">
160 </span><span·class="n">Transports</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4021523599-1">[</span><span·class="p"·data-group-id="4021523599-2">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4021523599-3">{</span><span·class="mi">141</span><span·c[·...·truncated·by·diffoscope;·len:·238,·SHA:·4ec702ee7d33ed3a60fe611c1078fc6bfa8038ad22ae79aa8f49911a150486bb·...·]-2">}</span><span·class="p">,</span><span·class="w">160 </span><span·class="n">Transports</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0064983751-1">[</span><span·class="p"·data-group-id="0064983751-2">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0064983751-3">{</span><span·class="mi">141</span><span·c[·...·truncated·by·diffoscope;·len:·238,·SHA:·782dd86f0767a89c7ffea59122ca0960cf98f17703d06c9bf7d018c955c83dab·...·]-2">}</span><span·class="p">,</span><span·class="w">
161 ···············</span><span·class="p"·data-group-id="4021523599-4">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4021523599-5">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·428,·SHA:·fd14bdeea97a4a930409ac32486e28d10c81f6289360fe30c192e5a046c943f2·...·]-1">]</span><span·class="p">,</span><span·class="w">161 ···············</span><span·class="p"·data-group-id="0064983751-4">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0064983751-5">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·428,·SHA:·b52291a721717724fdd991d2c93257e59ba92eaed07bb8a9089635b89b3f660f·...·]-1">]</span><span·class="p">,</span><span·class="w">
162 </span><span·class="n">EngineID</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;mbj&#39;s·engine&quot;</span><span·class="p">,</span><span·class="w">162 </span><span·class="n">EngineID</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;mbj&#39;s·engine&quot;</span><span·class="p">,</span><span·class="w">
163 </span><span·class="n">MMS</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">484</span><span·class="p">,</span><span·class="w">163 </span><span·class="n">MMS</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">484</span><span·class="p">,</span><span·class="w">
164 </span><span·class="n">AgentConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">164 </span><span·class="n">AgentConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
165 ···</span><span·class="p"·data-group-id="4021523599-6">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="4021523599-7">(</span><span·class="ss">intAgentUDPPort</span><span·class="p">,</span><span·class="w">·········[·...·truncated·by·diffoscope;·len:·81,·SHA:·52236bb33dbb78709c9b8310cf8621b977f1c7301089f061e25c3a82a150c465·...·]-7">)</span><span·class="p">,</span><span·class="w">165 ···</span><span·class="p"·data-group-id="0064983751-6">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="0064983751-7">(</span><span·class="ss">intAgentUDPPort</span><span·class="p">,</span><span·class="w">·········[·...·truncated·by·diffoscope;·len:·81,·SHA:·8745f2de7d9bd606ba1bc17c206da1dbec010ac9a6a38e360a207da62f7a459b·...·]-7">)</span><span·class="p">,</span><span·class="w">
166 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="4021523599-8">(</span><span·class="ss">intAgentTransports</span><span·class="p">,</span><span·class="w">·······</span><span·class="n">Transports</span><span·class="p"·data-group-id="4021523599-8">)</span><span·class="p">,</span><span·class="w">166 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="0064983751-8">(</span><span·class="ss">intAgentTransports</span><span·class="p">,</span><span·class="w">·······</span><span·class="n">Transports</span><span·class="p"·data-group-id="0064983751-8">)</span><span·class="p">,</span><span·class="w">
167 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="4021523599-9">(</span><span·class="ss">snmpEngineID</span><span·class="p">,</span><span·class="w">·············</span><span·class="n">EngineID</span><span·class="p"·data-group-id="4021523599-9">)</span><span·class="p">,</span><span·class="w">167 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="0064983751-9">(</span><span·class="ss">snmpEngineID</span><span·class="p">,</span><span·class="w">·············</span><span·class="n">EngineID</span><span·class="p"·data-group-id="0064983751-9">)</span><span·class="p">,</span><span·class="w">
168 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="4021523599-10">(</span><span·class="ss">snmpEngineMaxMessageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MMS</span><span·class="p"·data-group-id="4021523599-10">)</span><span·class="p"·data-group-id="4021523599-6">]</span><span·class="p">,</span><span·class="w">168 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">agent_entry</span><span·class="p"·data-group-id="0064983751-10">(</span><span·class="ss">snmpEngineMaxMessageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MMS</span><span·class="p"·data-group-id="0064983751-10">)</span><span·class="p"·data-group-id="0064983751-6">]</span><span·class="p">,</span><span·class="w">
169 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_agent_config</span><span·class="p"·data-group-id="4021523599-11">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AgentConfig</span><span·class="p"·data-group-id="4021523599-11">)</span><span·class="p">,</span></code></pre><p>These·are·the·supported·en[·...·truncated·by·diffoscope;·len:·435,·SHA:·bdd1b94432b16e9c6167c2df6576e9753667fff0e6f93ff6fb36a55b44155ac2·...·]-1">}</span><span·class="p">.</span><span·class="w">·····················</span><span·class="c1">%·Mandatory</span><span·class="w">169 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_agent_config</span><span·class="p"·data-group-id="0064983751-11">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">AgentConfig</span><span·class="p"·data-group-id="0064983751-11">)</span><span·class="p">,</span></code></pre><p>These·are·the·supported·en[·...·truncated·by·diffoscope;·len:·435,·SHA:·a7e1a24ea1330832f6f716df333ed7b856f8cc3ffdf62ac11d172da2dfa9e8ce·...·]-1">}</span><span·class="p">.</span><span·class="w">·····················</span><span·class="c1">%·Mandatory</span><span·class="w">
170 ······</span><span·class="p"·data-group-id="0206020323-3">{</span><span·class="ss">snmpEngineMaxMessageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">snmp_framework_mib</span><span·class="p">:</span><span·class="nf">max_message_size</span><span·class="p"·data-group-id="02[·...·truncated·by·diffoscope;·len:·114,·SHA:·94f091697d799ca5bc76ff4857dd873da981d3b9832e45912a60963f30882980·...·]-3">}</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%·Mandatory</span><span·class="w">170 ······</span><span·class="p"·data-group-id="0489361119-3">{</span><span·class="ss">snmpEngineMaxMessageSize</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">snmp_framework_mib</span><span·class="p">:</span><span·class="nf">max_message_size</span><span·class="p"·data-group-id="04[·...·truncated·by·diffoscope;·len:·114,·SHA:·f9a94618e187d51a7d5b3fec8350cb2b6c2f7db8e43ff53602c403473653b502·...·]-3">}</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%·Mandatory</span><span·class="w">
171 ······</span><span·class="p"·data-group-id="0206020323-5">{</span><span·class="ss">intAgentUDPPort</span><span·class="p">,</span><span·class="w">··········</span><span·class="nc">inet</span><span·class="p">:</span><span·class="nf">port_number</span><span·class="p"·data-group-id="0206020323-6">(</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·fd57c4b6e9d2c2df2cf1e7eee2a9780870ed38cafc491b4611079a264c805e93·...·]-5">}</span><span·class="p">.</span><span·class="w">······················</span><span·class="c1">%·Optional</span><span·class="w">171 ······</span><span·class="p"·data-group-id="0489361119-5">{</span><span·class="ss">intAgentUDPPort</span><span·class="p">,</span><span·class="w">··········</span><span·class="nc">inet</span><span·class="p">:</span><span·class="nf">port_number</span><span·class="p"·data-group-id="0489361119-6">(</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·1514db85719ee1474db3ec9f7822989d59eae552c0396058068923022f07431a·...·]-5">}</span><span·class="p">.</span><span·class="w">······················</span><span·class="c1">%·Optional</span><span·class="w">
172 ······</span><span·class="p"·data-group-id="0206020323-7">{</span><span·class="ss">intAgentTransports</span><span·class="p">,</span><span·class="w">·······</span><span·class="p"·data-group-id="0206020323-8">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">intAgentTra[·...·truncated·by·diffoscope;·len:·213,·SHA:·e99e7a1385ecbd7c9c98cd58d8f0d0a11c2bf8622cc38edd602f9aa415a7a35c·...·]-7">}</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·Mandatory</span></code></pre><p>If·a·&quot;traditional&quot;·transport·is·specified·(without·explicit·<code·class="inline">Kind</code>,·handling172 ······</span><span·class="p"·data-group-id="0489361119-7">{</span><span·class="ss">intAgentTransports</span><span·class="p">,</span><span·class="w">·······</span><span·class="p"·data-group-id="0489361119-8">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">intAgentTra[·...·truncated·by·diffoscope;·len:·213,·SHA:·c3b810755b61fae46639c08fc212afe1fa9eeb87e4ea76207c9546011767e58f·...·]-7">}</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·Mandatory</span></code></pre><p>If·a·&quot;traditional&quot;·transport·is·specified·(without·explicit·<code·class="inline">Kind</code>,·handling
173 both·requests·and·traps)·for·a·transport·domain,·its·<em>not</em>·possible·to·also173 both·requests·and·traps)·for·a·transport·domain,·its·<em>not</em>·possible·to·also
174 specify·a·transport·(for·that·domain)·with·a·specific·<code·class="inline">Kind</code>.·This·is·for174 specify·a·transport·(for·that·domain)·with·a·specific·<code·class="inline">Kind</code>.·This·is·for
175 example,·<em>not</em>·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="p"·data-group-id="3922865575-1">[</span><span·class="p"·data-group-id="3922865575-2">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3922865575-3">{</span><span·class="p"·data-group-id="3922865575-4">{</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">213</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">24</span><span·class="p"·data-group-id="3922865575-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4000</span><span·class="p"·data-group-id="3922865575-3">}</span><span·class="p"·data-group-id="3922865575-2">}</span><span·class="p">,</span><span·class="w"> 
176 ··</span><span·class="p"·data-group-id="3922865575-5">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3922865575-6">{</span><span·class="p"·data-group-id="3922865575-7">{<[·...·truncated·by·diffoscope;·len:·665,·SHA:·66781b6e96e7189fbbc8f89ed4b3cc145e7bb16a71f4b76947ac21b974ccf156·...·]175 example,·<em>not</em>·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="p"·data-group-id="9826177121-1">[</span><span·class="p"·data-group-id="9826177121-2">{</span><span·class="ss">transportDomainUdpIpv4</spa[·...·truncated·by·diffoscope;·len:·609,·SHA:·1729571e915781501495e159ea0fb75a9908334ff3f09ba13424da381ba3521e·...·]
 176 ··</span><span·class="p"·data-group-id="9826177121-5">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9826177121-6">{</span><span·class="p"·data-group-id="9826177121-7">{</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">213</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">24</span><span·class="p"·data-group-id="9826177121-7">}</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4001</span><span·class="p"·data-group-id="9826177121-6">}</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">trap_sender</span><span·class="p"·data-group-id="9826177121-5">}</span><span·class="p"·data-group-id="9826177121-1">]</span><span·class="p">.</span></code></pre><p>Note·that·only·one·transport·per·kind·for·each·transport·domain·can·be
177 configured.</p><p><code·class="inline">PortInfo</code>·<code·class="inline">system</code>·is·used·to·indicate·that·the·'system'·should·choose·(the·way177 configured.</p><p><code·class="inline">PortInfo</code>·<code·class="inline">system</code>·is·used·to·indicate·that·the·'system'·should·choose·(the·way
178 port·number·'0'·(zero)·is·normally·used).·Port·info·'0'·(zero)·cannot·be·used178 port·number·'0'·(zero)·is·normally·used).·Port·info·'0'·(zero)·cannot·be·used
179 for·this,·since·it·is·(internally)·used·to·represent·the·'default'·port·number.</p><p>In·the·traditional·transport·entries,·when·the·<code·class="inline">Addr</code>·value·does·not·contain·a179 for·this,·since·it·is·(internally)·used·to·represent·the·'default'·port·number.</p><p>In·the·traditional·transport·entries,·when·the·<code·class="inline">Addr</code>·value·does·not·contain·a
180 port·number,·the·value·of·<code·class="inline">intAgentUDPPort</code>·is·used.</p><p>Note·that·the·(new)·extended·transport·entries·(including·<code·class="inline">Kind</code>·and·<code·class="inline">Opts</code>)180 port·number,·the·value·of·<code·class="inline">intAgentUDPPort</code>·is·used.</p><p>Note·that·the·(new)·extended·transport·entries·(including·<code·class="inline">Kind</code>·and·<code·class="inline">Opts</code>)
181 <em>must</em>·specify·port-info·as·they·ignore·any·value·specified·by181 <em>must</em>·specify·port-info·as·they·ignore·any·value·specified·by
182 <code·class="inline">intAgentUDPPort</code>.</p><p><code·class="inline">Opts</code>·is·the·same·as·for·the·<a·href="snmp_config.html#agent_ni_opts">net-if</a>·process182 <code·class="inline">intAgentUDPPort</code>.</p><p><code·class="inline">Opts</code>·is·the·same·as·for·the·<a·href="snmp_config.html#agent_ni_opts">net-if</a>·process
183 <em>and</em>·takes·precedence·(for·that·transport)·if·present.·The·point·is·that·each183 <em>and</em>·takes·precedence·(for·that·transport)·if·present.·The·point·is·that·each
Offset 190, 77 lines modifiedOffset 190, 77 lines modified
190 ··</a>190 ··</a>
191 ··<span·class="text">Contexts</span>191 ··<span·class="text">Contexts</span>
192 </h2>192 </h2>
193 <p>The·context·information·should·be·stored·in·a·file·called·<code·class="inline">context.conf</code>.·The193 <p>The·context·information·should·be·stored·in·a·file·called·<code·class="inline">context.conf</code>.·The
194 default·context·<code·class="inline">&quot;&quot;</code>·need·not·be·present.</p><p>Each·row·defines·a·context·in·the·agent.·This·information·is·used·in·the·table194 default·context·<code·class="inline">&quot;&quot;</code>·need·not·be·present.</p><p>Each·row·defines·a·context·in·the·agent.·This·information·is·used·in·the·table
195 <code·class="inline">vacmContextTable</code>·in·the·SNMP-VIEW-BASED-ACM-MIB.</p><p>Each·entry·is·a·term:</p><p><code·class="inline">ContextName.</code></p><ul><li><code·class="inline">ContextName</code>·is·a·string.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">195 <code·class="inline">vacmContextTable</code>·in·the·SNMP-VIEW-BASED-ACM-MIB.</p><p>Each·entry·is·a·term:</p><p><code·class="inline">ContextName.</code></p><ul><li><code·class="inline">ContextName</code>·is·a·string.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
196 </span><span·class="n">ContextConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">196 </span><span·class="n">ContextConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
197 ···</span><span·class="p"·data-group-id="4402866596-1">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">context_entry</span><span·class="p"·data-group-id="4402866596-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="4402866596-2">)</span><span·class="p">,</span><span·class="w">197 ···</span><span·class="p"·data-group-id="8385467428-1">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">context_entry</span><span·class="p"·data-group-id="8385467428-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="8385467428-2">)</span><span·class="p">,</span><span·class="w">
198 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">context_entry</span><span·class="p"·data-group-id="4402866596-3">(</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="4402866596-3">)</span><span·class="p"·data-group-id="4402866596-1">]</span><span·class="p">,</span><span·class="w">198 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">context_entry</span><span·class="p"·data-group-id="8385467428-3">(</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="8385467428-3">)</span><span·class="p"·data-group-id="8385467428-1">]</span><span·class="p">,</span><span·class="w">
199 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_context_config</span><span·class="p"·data-group-id="4402866596-4">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContextConfig</span><span·class="p"·data-group-id="4402866596-4">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="system_information"></a></p><h2·id="system-information"·class="section-heading">199 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_context_config</span><span·class="p"·data-group-id="8385467428-4">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContextConfig</span><span·class="p"·data-group-id="8385467428-4">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="system_information"></a></p><h2·id="system-information"·class="section-heading">
200 ··<a·href="#system-information"·class="hover-link">200 ··<a·href="#system-information"·class="hover-link">
201 ····<i·class="ri-link-m"·aria-hidden="true"></i>201 ····<i·class="ri-link-m"·aria-hidden="true"></i>
202 ··</a>202 ··</a>
203 ··<span·class="text">System·Information</span>203 ··<span·class="text">System·Information</span>
204 </h2>204 </h2>
205 <p>The·system·information·should·be·stored·in·a·file·called·<code·class="inline">standard.conf</code>.</p><p>Each·entry·is·a·tuple·of·size·two:</p><p><code·class="inline">{SystemVariable,·Value}.</code></p><ul><li><code·class="inline">SystemVariable</code>·is·one·of·the·variables·in·the·system·group,·or205 <p>The·system·information·should·be·stored·in·a·file·called·<code·class="inline">standard.conf</code>.</p><p>Each·entry·is·a·tuple·of·size·two:</p><p><code·class="inline">{SystemVariable,·Value}.</code></p><ul><li><code·class="inline">SystemVariable</code>·is·one·of·the·variables·in·the·system·group,·or
206 <code·class="inline">snmpEnableAuthenTraps</code>.</li><li><code·class="inline">Value</code>·is·the·value·for·the·variable.</li></ul><p>The·following·example·shows·a·valid·<code·class="inline">standard.conf</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7869222335-1">{</span><span·class="ss">sysDescr</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Erlang·SNMP·agent&quot;</span><span·class="p"·data-group-id="7869222335-1">}</span><span·class="p">.</span><span·class="w">206 <code·class="inline">snmpEnableAuthenTraps</code>.</li><li><code·class="inline">Value</code>·is·the·value·for·the·variable.</li></ul><p>The·following·example·shows·a·valid·<code·class="inline">standard.conf</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6471383901-1">{</span><span·class="ss">sysDescr</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Erlang·SNMP·agent&quot;</span><span·class="p"·data-group-id="6471383901-1">}</span><span·class="p">.</span><span·class="w">
207 </span><span·class="p"·data-group-id="7869222335-2">{</span><span·class="ss">sysObjectID</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7869222335-3">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·119,·SHA:·3d13c717fcab97b66ad078e41f9a8fe2f53e6b92edc62700d50d649eda308917·...·]-2">}</span><span·class="p">.</span><span·class="w">207 </span><span·class="p"·data-group-id="6471383901-2">{</span><span·class="ss">sysObjectID</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6471383901-3">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·119,·SHA:·7eec5cc7540023c0cd4ac023196b90a4eaae341d9c316c59bc5a8457ff0a47a5·...·]-2">}</span><span·class="p">.</span><span·class="w">
208 </span><span·class="p"·data-group-id="7869222335-4">{</span><span·class="ss">sysContact</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;(mbj,eklas)@erlang.ericsson.se&quot;</span><span·class="p"·data-group-id="7869222335-4">}</span><span·class="p">.</span><span·class="w">208 </span><span·class="p"·data-group-id="6471383901-4">{</span><span·class="ss">sysContact</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;(mbj,eklas)@erlang.ericsson.se&quot;</span><span·class="p"·data-group-id="6471383901-4">}</span><span·class="p">.</span><span·class="w">
209 </span><span·class="p"·data-group-id="7869222335-5">{</span><span·class="ss">sysName</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;test&quot;</span><span·class="p"·data-group-id="7869222335-5">}</span><span·class="p">.</span><span·class="w">209 </span><span·class="p"·data-group-id="6471383901-5">{</span><span·class="ss">sysName</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;test&quot;</span><span·class="p"·data-group-id="6471383901-5">}</span><span·class="p">.</span><span·class="w">
210 </span><span·class="p"·data-group-id="7869222335-6">{</span><span·class="ss">sysServices</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">72</span><span·class="p"·data-group-id="7869222335-6">}</span><span·class="p">.</span><span·class="w">210 </span><span·class="p"·data-group-id="6471383901-6">{</span><span·class="ss">sysServices</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">72</span><span·class="p"·data-group-id="6471383901-6">}</span><span·class="p">.</span><span·class="w">
211 </span><span·class="p"·data-group-id="7869222335-7">{</span><span·class="ss">snmpEnableAuthenTraps</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">enabled</span><span·class="p"·data-group-id="7869222335-7">}</span><span·class="p">.</span></code></pre><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">211 </span><span·class="p"·data-group-id="6471383901-7">{</span><span·class="ss">snmpEnableAuthenTraps</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">enabled</span><span·class="p"·data-group-id="6471383901-7">}</span><span·class="p">.</span></code></pre><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
212 </span><span·class="n">StdConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">212 </span><span·class="n">StdConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
213 ···</span><span·class="p"·data-group-id="9153037596-1">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="9153037596-2">(</span><span·class="ss">sysDescr</span><span·class="p">,</span><span·class="w">····</span><s[·...·truncated·by·diffoscope;·len:·90,·SHA:·a98323f1e0ad56ef18897ee73ffcd965980ec4ba5d7364bfddc180040f4903c5·...·]6-2">)</span><span·class="p">,</span><span·class="w">213 ···</span><span·class="p"·data-group-id="4147053456-1">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="4147053456-2">(</span><span·class="ss">sysDescr</span><span·class="p">,</span><span·class="w">····</span><s[·...·truncated·by·diffoscope;·len:·90,·SHA:·5e9074cb95d135bf76a524408679147e8a9e2990160bb26a185164f4ec058707·...·]6-2">)</span><span·class="p">,</span><span·class="w">
214 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="9153037596-3">(</span><span·class="ss">sysObjectID</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9153037596-4">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·118,·SHA:·35860697e40c4e515fea9bb966fcc19ce4d28a1c9d0b8183dc50fd1fa857c23f·...·]6-3">)</span><span·class="p">,</span><span·class="w">214 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="4147053456-3">(</span><span·class="ss">sysObjectID</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4147053456-4">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·118,·SHA:·d44e147bf59571ebb9d47c69b36de1dd641d5794b213a26a1712d1274ac47b11·...·]6-3">)</span><span·class="p">,</span><span·class="w">
215 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="9153037596-5">(</span><span·class="ss">sysContact</span><span·class="p">,</span><span·class="w">··</span><span·class="s">&quot;(mbj,eklas)@erlang.ericsson.se&quot;</span><span·class="p"·data-group-id="9153037596-5">)</span><span·class="p">,</span><span·class="w">215 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="4147053456-5">(</span><span·class="ss">sysContact</span><span·class="p">,</span><span·class="w">··</span><span·class="s">&quot;(mbj,eklas)@erlang.ericsson.se&quot;</span><span·class="p"·data-group-id="4147053456-5">)</span><span·class="p">,</span><span·class="w">
216 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="9153037596-6">(</span><span·class="ss">sysName</span><span·class="p">,</span><span·class="w">·····</span><span·class="s">&quot;test&quot;</span><span·class="p"·data-group-id="9153037596-6">)</span><span·class="p">,</span><span·class="w">216 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="4147053456-6">(</span><span·class="ss">sysName</span><span·class="p">,</span><span·class="w">·····</span><span·class="s">&quot;test&quot;</span><span·class="p"·data-group-id="4147053456-6">)</span><span·class="p">,</span><span·class="w">
217 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="9153037596-7">(</span><span·class="ss">sysServices</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">72</span><span·class="p"·data-group-id="9153037596-7">)</span><span·class="p">,</span><span·class="w">217 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="4147053456-7">(</span><span·class="ss">sysServices</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">72</span><span·class="p"·data-group-id="4147053456-7">)</span><span·class="p">,</span><span·class="w">
218 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="9153037596-8">(</span><span·class="ss">snmpEnableAuthenTraps</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">enabled</span><span·class="p"·data-group-id="9153037596-8">)</span><span·class="p"·data-group-id="9153037596-1">]</span><span·class="p">,</span><span·class="w">218 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">standard_entry</span><span·class="p"·data-group-id="4147053456-8">(</span><span·class="ss">snmpEnableAuthenTraps</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">enabled</span><span·class="p"·data-group-id="4147053456-8">)</span><span·class="p"·data-group-id="4147053456-1">]</span><span·class="p">,</span><span·class="w">
219 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_standard_config</span><span·class="p"·data-group-id="9153037596-9">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StdConfig</span><span·class="p"·data-group-id="9153037596-9">)</span><span·class="p">,</span></code></pre><p>A·value·must·be·provided·for·all·variables,·which·lack·default·values·in·the219 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_standard_config</span><span·class="p"·data-group-id="4147053456-9">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StdConfig</span><span·class="p"·data-group-id="4147053456-9">)</span><span·class="p">,</span></code></pre><p>A·value·must·be·provided·for·all·variables,·which·lack·default·values·in·the
220 MIB.</p><p><a·href=""·id="community"></a></p><h2·id="communities"·class="section-heading">220 MIB.</p><p><a·href=""·id="community"></a></p><h2·id="communities"·class="section-heading">
221 ··<a·href="#communities"·class="hover-link">221 ··<a·href="#communities"·class="hover-link">
222 ····<i·class="ri-link-m"·aria-hidden="true"></i>222 ····<i·class="ri-link-m"·aria-hidden="true"></i>
223 ··</a>223 ··</a>
224 ··<span·class="text">Communities</span>224 ··<span·class="text">Communities</span>
225 </h2>225 </h2>
226 <p>The·community·information·should·be·stored·in·a·file·called·<code·class="inline">community.conf</code>.·It226 <p>The·community·information·should·be·stored·in·a·file·called·<code·class="inline">community.conf</code>.·It
227 must·be·present·if·the·agent·is·configured·for·SNMPv1·or·SNMPv2c.</p><p>An·SNMP·<em>community</em>·is·a·relationship·between·an·SNMP·agent·and·a·set·of·SNMP227 must·be·present·if·the·agent·is·configured·for·SNMPv1·or·SNMPv2c.</p><p>An·SNMP·<em>community</em>·is·a·relationship·between·an·SNMP·agent·and·a·set·of·SNMP
228 managers·that·defines·authentication,·access·control·and·proxy·characteristics.</p><p>The·corresponding·table·is·<code·class="inline">snmpCommunityTable</code>·in·the·SNMP-COMMUNITY-MIB.</p><p>Each·entry·is·a·term:</p><p><code·class="inline">{CommunityIndex,·CommunityName,·SecurityName,·ContextName,·TransportTag}.</code></p><ul><li><code·class="inline">CommunityIndex</code>·is·a·non-empty·string.</li><li><code·class="inline">CommunityName</code>·is·a·string.</li><li><code·class="inline">SecurityName</code>·is·a·string.</li><li><code·class="inline">ContextName</code>·is·a·string.</li><li><code·class="inline">TransportTag</code>·is·a·string.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">228 managers·that·defines·authentication,·access·control·and·proxy·characteristics.</p><p>The·corresponding·table·is·<code·class="inline">snmpCommunityTable</code>·in·the·SNMP-COMMUNITY-MIB.</p><p>Each·entry·is·a·term:</p><p><code·class="inline">{CommunityIndex,·CommunityName,·SecurityName,·ContextName,·TransportTag}.</code></p><ul><li><code·class="inline">CommunityIndex</code>·is·a·non-empty·string.</li><li><code·class="inline">CommunityName</code>·is·a·string.</li><li><code·class="inline">SecurityName</code>·is·a·string.</li><li><code·class="inline">ContextName</code>·is·a·string.</li><li><code·class="inline">TransportTag</code>·is·a·string.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">········</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
229 </span><span·class="n">CommunityConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">229 </span><span·class="n">CommunityConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
230 ···</span><span·class="p"·data-group-id="4521919304-1">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">community_entry</span><span·class="p"·data-group-id="4521919304-2">(</span><span·class="s">&quot;public&quot;</span><span·class="p"·data-group-id="4521919304-2">)</span><span·class="p">,</span><span·class="w">230 ···</span><span·class="p"·data-group-id="6208125938-1">[</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">community_entry</span><span·class="p"·data-group-id="6208125938-2">(</span><span·class="s">&quot;public&quot;</span><span·class="p"·data-group-id="6208125938-2">)</span><span·class="p">,</span><span·class="w">
231 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">community_entry</span><span·class="p"·data-group-id="4521919304-3">(</span><span·class="s">&quot;all-rights&quot;</span><span·class="p"·data-group-id="4521919304-3">)</span><span·class="p">,</span><span·class="w">231 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">community_entry</span><span·class="p"·data-group-id="6208125938-3">(</span><span·class="s">&quot;all-rights&quot;</span><span·class="p"·data-group-id="6208125938-3">)</span><span·class="p">,</span><span·class="w">
232 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">community_entry</span><span·class="p"·data-group-id="4521919304-4">(</span><span·class="s">&quot;standard·trap&quot;</span><span·class="p">,</span><span·class="w">232 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">community_entry</span><span·class="p"·data-group-id="6208125938-4">(</span><span·class="s">&quot;standard·trap&quot;</span><span·class="p">,</span><span·class="w">
233 ·······························</span><span·class="s">&quot;standard·trap&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;initial&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p"·data-group-id="4521919304-4">)</span><span·class="p"·data-group-id="4521919304-1">]</span><span·class="p">,</span><span·class="w">233 ·······························</span><span·class="s">&quot;standard·trap&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;initial&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p"·data-group-id="6208125938-4">)</span><span·class="p"·data-group-id="6208125938-1">]</span><span·class="p">,</span><span·class="w">
234 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_community_config</span><span·class="p"·data-group-id="4521919304-5">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CommunityConfig</span><span·class="p"·data-group-id="4521919304-5">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="vacm"></a></p><h2·id="mib-views-for-vacm"·class="section-heading">234 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_community_config</span><span·class="p"·data-group-id="6208125938-5">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">CommunityConfig</span><span·class="p"·data-group-id="6208125938-5">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="vacm"></a></p><h2·id="mib-views-for-vacm"·class="section-heading">
235 ··<a·href="#mib-views-for-vacm"·class="hover-link">235 ··<a·href="#mib-views-for-vacm"·class="hover-link">
236 ····<i·class="ri-link-m"·aria-hidden="true"></i>236 ····<i·class="ri-link-m"·aria-hidden="true"></i>
237 ··</a>237 ··</a>
238 ··<span·class="text">MIB·Views·for·VACM</span>238 ··<span·class="text">MIB·Views·for·VACM</span>
239 </h2>239 </h2>
240 <p>The·information·about·MIB·Views·for·VACM·should·be·stored·in·a·file·called240 <p>The·information·about·MIB·Views·for·VACM·should·be·stored·in·a·file·called
241 <code·class="inline">vacm.conf</code>.</p><p>The·corresponding·tables·are·<code·class="inline">vacmSecurityToGroupTable</code>,·<code·class="inline">vacmAccessTable</code>·and241 <code·class="inline">vacm.conf</code>.</p><p>The·corresponding·tables·are·<code·class="inline">vacmSecurityToGroupTable</code>,·<code·class="inline">vacmAccessTable</code>·and
242 <code·class="inline">vacmViewTreeFamilyTable</code>·in·the·SNMP-VIEW-BASED-ACM-MIB.</p><p>Each·entry·is·one·of·the·terms,·one·entry·corresponds·to·one·row·in·one·of·the242 <code·class="inline">vacmViewTreeFamilyTable</code>·in·the·SNMP-VIEW-BASED-ACM-MIB.</p><p>Each·entry·is·one·of·the·terms,·one·entry·corresponds·to·one·row·in·one·of·the
243 tables.</p><p><code·class="inline">{vacmSecurityToGroup,·SecModel,·SecName,·GroupName}.</code></p><p><code·class="inline">{vacmAccess,·GroupName,·Prefix,·SecModel,·SecLevel,·Match,·ReadView,·WriteView,·NotifyView}.</code></p><p><code·class="inline">{vacmViewTreeFamily,·ViewIndex,·ViewSubtree,·ViewStatus,·ViewMask}.</code></p><ul><li><code·class="inline">SecModel</code>·is·<code·class="inline">any</code>,·<code·class="inline">v1</code>,·<code·class="inline">v2c</code>,·or·<code·class="inline">usm</code>.</li><li><code·class="inline">SecName</code>·is·a·string.</li><li><code·class="inline">GroupName</code>·is·a·string.</li><li><code·class="inline">Prefix</code>·is·a·string.</li><li><code·class="inline">SecLevel</code>·is·<code·class="inline">noAuthNoPriv</code>,·<code·class="inline">authNoPriv</code>,·or·<code·class="inline">authPriv</code></li><li><code·class="inline">Match</code>·is·<code·class="inline">prefix</code>·or·<code·class="inline">exact</code>.</li><li><code·class="inline">ReadView</code>·is·a·string.</li><li><code·class="inline">WriteView</code>·is·a·string.</li><li><code·class="inline">NotifyView</code>·is·a·string.</li><li><code·class="inline">ViewIndex</code>·is·an·integer.</li><li><code·class="inline">ViewSubtree</code>·is·a·list·of·integer.</li><li><code·class="inline">ViewStatus</code>·is·either·<code·class="inline">included</code>·or·<code·class="inline">excluded</code></li><li><code·class="inline">ViewMask</code>·is·either·<code·class="inline">null</code>·or·a·list·of·ones·and·zeros.·Ones·nominate·that·an243 tables.</p><p><code·class="inline">{vacmSecurityToGroup,·SecModel,·SecName,·GroupName}.</code></p><p><code·class="inline">{vacmAccess,·GroupName,·Prefix,·SecModel,·SecLevel,·Match,·ReadView,·WriteView,·NotifyView}.</code></p><p><code·class="inline">{vacmViewTreeFamily,·ViewIndex,·ViewSubtree,·ViewStatus,·ViewMask}.</code></p><ul><li><code·class="inline">SecModel</code>·is·<code·class="inline">any</code>,·<code·class="inline">v1</code>,·<code·class="inline">v2c</code>,·or·<code·class="inline">usm</code>.</li><li><code·class="inline">SecName</code>·is·a·string.</li><li><code·class="inline">GroupName</code>·is·a·string.</li><li><code·class="inline">Prefix</code>·is·a·string.</li><li><code·class="inline">SecLevel</code>·is·<code·class="inline">noAuthNoPriv</code>,·<code·class="inline">authNoPriv</code>,·or·<code·class="inline">authPriv</code></li><li><code·class="inline">Match</code>·is·<code·class="inline">prefix</code>·or·<code·class="inline">exact</code>.</li><li><code·class="inline">ReadView</code>·is·a·string.</li><li><code·class="inline">WriteView</code>·is·a·string.</li><li><code·class="inline">NotifyView</code>·is·a·string.</li><li><code·class="inline">ViewIndex</code>·is·an·integer.</li><li><code·class="inline">ViewSubtree</code>·is·a·list·of·integer.</li><li><code·class="inline">ViewStatus</code>·is·either·<code·class="inline">included</code>·or·<code·class="inline">excluded</code></li><li><code·class="inline">ViewMask</code>·is·either·<code·class="inline">null</code>·or·a·list·of·ones·and·zeros.·Ones·nominate·that·an
244 exact·match·is·used·for·this·sub-identifier.·Zeros·are·wild-cards·which·match244 exact·match·is·used·for·this·sub-identifier.·Zeros·are·wild-cards·which·match
245 any·sub-identifier.·If·the·mask·is·shorter·than·the·sub-tree,·the·tail·is245 any·sub-identifier.·If·the·mask·is·shorter·than·the·sub-tree,·the·tail·is
246 regarded·as·all·ones.·<code·class="inline">null</code>·is·shorthand·for·a·mask·with·all·ones.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">246 regarded·as·all·ones.·<code·class="inline">null</code>·is·shorthand·for·a·mask·with·all·ones.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
247 </span><span·class="n">SecName</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;plain&quot;</span><span·class="p">,</span><span·class="w">247 </span><span·class="n">SecName</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;plain&quot;</span><span·class="p">,</span><span·class="w">
248 </span><span·class="n">VacmConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">248 </span><span·class="n">VacmConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
249 ···</span><span·class="p"·data-group-id="7485784893-1">[</span><span·class="c1">%%························SecModel,·SecName,·GroupName</span><span·class="w">249 ···</span><span·class="p"·data-group-id="2684504226-1">[</span><span·class="c1">%%························SecModel,·SecName,·GroupName</span><span·class="w">
250 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">vacm_s2g_entry</span><span·class="p"·data-group-id="7485784893-2">(</span><span·class="ss">usm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecName</span><span·class="p"·data-group-id="7485784893-2">)</span><span·class="p">,</span><span·class="w">250 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">vacm_s2g_entry</span><span·class="p"·data-group-id="2684504226-2">(</span><span·class="ss">usm</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SecName</span><span·class="p"·data-group-id="2684504226-2">)</span><span·class="p">,</span><span·class="w">
  
251 ····</span><span·class="c1">%%························GroupName,·Prefix,·SecModel,</span><span·class="w">251 ····</span><span·class="c1">%%························GroupName,·Prefix,·SecModel,</span><span·class="w">
252 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">vacm_acc_entry</span><span·class="p"·data-group-id="7485784893-3">(</span><span·class="n">SecName</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">any</span><span·class="p">,</span><span·class="w">252 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">vacm_acc_entry</span><span·class="p"·data-group-id="2684504226-3">(</span><span·class="n">SecName</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">any</span><span·class="p">,</span><span·class="w">
253 ····</span><span·class="c1">%%························SecLevel,·Match,·RV,·WV,·NV</span><span·class="w">253 ····</span><span·class="c1">%%························SecLevel,·Match,·RV,·WV,·NV</span><span·class="w">
254 ······························</span><span·class="ss">noAuthNoPriv</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">exact</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;all&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;all&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;all&quot;</span><span·class="p"·data-group-id="7485784893-3">)</span><span·class="p">,</span><span·class="w">254 ······························</span><span·class="ss">noAuthNoPriv</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">exact</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;all&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;all&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;all&quot;</span><span·class="p"·data-group-id="2684504226-3">)</span><span·class="p">,</span><span·class="w">
  
255 ····</span><span·class="c1">%%························ViewName,·ViewSubtree,·ViewType,·ViewMask</span><span·class="w">255 ····</span><span·class="c1">%%························ViewName,·ViewSubtree,·ViewType,·ViewMask</span><span·class="w">
256 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">vacm_vtf_entry</span><span·class="p"·data-group-id="7485784893-4">(</span><span·class="s">&quot;restricted&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7485784893-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p[·...·truncated·by·diffoscope;·len:·387,·SHA:·6e8a158bae8b595d1090b0e49456d57734e48e0ce7d65cc8095ef4a0d35c87bc·...·]-1">]</span><span·class="p">,</span><span·class="w">256 ····</span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">vacm_vtf_entry</span><span·class="p"·data-group-id="2684504226-4">(</span><span·class="s">&quot;restricted&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2684504226-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p[·...·truncated·by·diffoscope;·len:·387,·SHA:·44f74755e917f36d16f907b9cf71027dd2818a5433df79307061ff05bead8a6f·...·]-1">]</span><span·class="p">,</span><span·class="w">
257 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_vacm_config</span><span·class="p"·data-group-id="7485784893-6">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">VacmConfig</span><span·class="p"·data-group-id="7485784893-6">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="usm"></a></p><h2·id="security-data-for-usm"·class="section-heading">257 </span><span·class="nc">snmpa_conf</span><span·class="p">:</span><span·class="nf">write_vacm_config</span><span·class="p"·data-group-id="2684504226-6">(</span><span·class="n">AgentDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">VacmConfig</span><span·class="p"·data-group-id="2684504226-6">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="usm"></a></p><h2·id="security-data-for-usm"·class="section-heading">
258 ··<a·href="#security-data-for-usm"·class="hover-link">258 ··<a·href="#security-data-for-usm"·class="hover-link">
259 ····<i·class="ri-link-m"·aria-hidden="true"></i>259 ····<i·class="ri-link-m"·aria-hidden="true"></i>
260 ··</a>260 ··</a>
261 ··<span·class="text">Security·data·for·USM</span>261 ··<span·class="text">Security·data·for·USM</span>
262 </h2>262 </h2>
263 <p>The·information·about·Security·data·for·USM·should·be·stored·in·a·file·called263 <p>The·information·about·Security·data·for·USM·should·be·stored·in·a·file·called
264 <code·class="inline">usm.conf</code>,·which·must·be·present·if·the·agent·is·configured·for·SNMPv3.</p><p>The·corresponding·table·is·<code·class="inline">usmUserTable</code>·in·the·SNMP-USER-BASED-SM-MIB264 <code·class="inline">usm.conf</code>,·which·must·be·present·if·the·agent·is·configured·for·SNMPv3.</p><p>The·corresponding·table·is·<code·class="inline">usmUserTable</code>·in·the·SNMP-USER-BASED-SM-MIB
Offset 271, 43 lines modifiedOffset 271, 43 lines modified
271 <code·class="inline">usmAesCfb128Protocol</code>.</p></li><li><p><code·class="inline">PrivKeyC</code>·is·a·string.</p></li><li><p><code·class="inline">OwnPrivKeyC</code>·is·a·string.</p></li><li><p><code·class="inline">Public</code>·is·a·string.</p></li><li><p><code·class="inline">AuthKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized271 <code·class="inline">usmAesCfb128Protocol</code>.</p></li><li><p><code·class="inline">PrivKeyC</code>·is·a·string.</p></li><li><p><code·class="inline">OwnPrivKeyC</code>·is·a·string.</p></li><li><p><code·class="inline">Public</code>·is·a·string.</p></li><li><p><code·class="inline">AuthKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized
272 authentication·key.·It·is·not·visible·in·the·MIB.·The·length·(number·of272 authentication·key.·It·is·not·visible·in·the·MIB.·The·length·(number·of
273 octets)·of·this·key·needs·to·be:</p><ul><li>16·if·<code·class="inline">usmHMACMD5AuthProtocol</code>.</li><li>20·if·<code·class="inline">usmHMACSHAAuthProtocol</code>.</li><li>28·if·<code·class="inline">usmHMAC128SHA224AuthProtocol</code>.</li><li>32·if·<code·class="inline">usmHMAC192SHA256AuthProtocol</code>.</li><li>48·if·<code·class="inline">usmHMAC256SHA384AuthProtocol</code>.</li><li>64·if·<code·class="inline">usmHMAC384SHA512AuthProtocol</code>.</li></ul></li><li><p><code·class="inline">PrivKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized273 octets)·of·this·key·needs·to·be:</p><ul><li>16·if·<code·class="inline">usmHMACMD5AuthProtocol</code>.</li><li>20·if·<code·class="inline">usmHMACSHAAuthProtocol</code>.</li><li>28·if·<code·class="inline">usmHMAC128SHA224AuthProtocol</code>.</li><li>32·if·<code·class="inline">usmHMAC192SHA256AuthProtocol</code>.</li><li>48·if·<code·class="inline">usmHMAC256SHA384AuthProtocol</code>.</li><li>64·if·<code·class="inline">usmHMAC384SHA512AuthProtocol</code>.</li></ul></li><li><p><code·class="inline">PrivKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized
274 encryption·key.·It·is·not·visible·in·the·MIB.·The·length·of·this·key·needs·to274 encryption·key.·It·is·not·visible·in·the·MIB.·The·length·of·this·key·needs·to
275 be·16·if·<code·class="inline">usmDESPrivProtocol</code>·or·<code·class="inline">usmAesCfb128Protocol</code>·is·used.</p></li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">275 be·16·if·<code·class="inline">usmDESPrivProtocol</code>·or·<code·class="inline">usmAesCfb128Protocol</code>·is·used.</p></li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">AgentDir</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
276 </span><span·class="n">EngineID</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;plain·engine&quot;</span><span·class="w">276 </span><span·class="n">EngineID</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;plain·engine&quot;</span><span·class="w">
277 </span><span·class="n">Passwd</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;FooBar·Hoopla&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·This·should·*obviously*·be·choosen·better</span><span·class="w">277 </span><span·class="n">Passwd</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;FooBar·Hoopla&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·This·should·*obviously*·be·choosen·better</span><span·class="w">
278 </span><span·class="n">Secret16</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">passwd2localized_key</span><span·class="p"·data-group-id="5680649826-1">(</span><span·class="nb">md5</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Passwd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EngineID</span><span·class="p"·data-group-id="5680649826-1">)</span><span·class="p">,</span><span·class="w">278 </span><span·class="n">Secret16</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">passwd2localized_key</span><span·class="p"·data-group-id="7611389716-1">(</span><span·class="nb">md5</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Passwd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EngineID</span><span·class="p"·data-group-id="7611389716-1">)</span><span·class="p">,</span><span·class="w">
279 </span><span·class="n">Secret20</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">passwd2localized_key</span><span·class="p"·data-group-id="5680649826-2">(</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Passwd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EngineID</span><span·class="p"·data-group-id="5680649826-2">)</span><span·class="p">,</span><span·class="w">279 </span><span·class="n">Secret20</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">snmp</span><span·class="p">:</span><span·class="nf">passwd2localized_key</span><span·class="p"·data-group-id="7611389716-2">(</span><span·class="ss">sha</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Passwd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EngineID</span><span·class="p"·data-group-id="7611389716-2">)</span><span·class="p">,</span><span·class="w">
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304 This·MIB·can·be·used·with·any·SNMP·version.</li><li>SNMP-COMMUNITY-MIB,·which·defines·managed·objects·for·coexistence·of·SNMPv1304 This·MIB·can·be·used·with·any·SNMP·version.</li><li>SNMP-COMMUNITY-MIB,·which·defines·managed·objects·for·coexistence·of·SNMPv1
305 and·SNMPv2c·with·SNMPv3.·This·MIB·is·only·useful·if·SNMPv1·or·SNMPv2c·is·used,305 and·SNMPv2c·with·SNMPv3.·This·MIB·is·only·useful·if·SNMPv1·or·SNMPv2c·is·used,
306 possibly·in·combination·with·SNMPv3.</li><li>SNMP-USER-BASED-SM-MIB,·which·defines·managed·objects·for·authentication·and306 possibly·in·combination·with·SNMPv3.</li><li>SNMP-USER-BASED-SM-MIB,·which·defines·managed·objects·for·authentication·and
307 privacy.·This·MIB·is·only·useful·with·SNMPv3.</li></ul><p>All·of·these·MIBs·should·be·loaded·into·the·Master·Agent.·Once·loaded,·these307 privacy.·This·MIB·is·only·useful·with·SNMPv3.</li></ul><p>All·of·these·MIBs·should·be·loaded·into·the·Master·Agent.·Once·loaded,·these
308 MIBs·are·always·available·in·all·contexts.</p><p>The·ASN.1·code,·the·Erlang·source·code,·and·the·generated·<code·class="inline">.hrl</code>·files·for·them308 MIBs·are·always·available·in·all·contexts.</p><p>The·ASN.1·code,·the·Erlang·source·code,·and·the·generated·<code·class="inline">.hrl</code>·files·for·them
309 are·provided·in·the·distribution·and·are·placed·in·the·directories·<code·class="inline">mibs</code>,309 are·provided·in·the·distribution·and·are·placed·in·the·directories·<code·class="inline">mibs</code>,
310 <code·class="inline">src</code>,·and·<code·class="inline">include</code>,·respectively,·in·the·<code·class="inline">snmp</code>·application.</p><p>The·<code·class="inline">.hrl</code>·files·are·generated·with·<a·href="snmpc.html#mib_to_hrl/1"><code·class="inline">snmpc:mib_to_hrl/1</code></a>.·Include·these·files·in310 <code·class="inline">src</code>,·and·<code·class="inline">include</code>,·respectively,·in·the·<code·class="inline">snmp</code>·application.</p><p>The·<code·class="inline">.hrl</code>·files·are·generated·with·<a·href="snmpc.html#mib_to_hrl/1"><code·class="inline">snmpc:mib_to_hrl/1</code></a>.·Include·these·files·in
311 your·code·as·in·the·following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3708236474-1">(</span><span·class="s">&quot;snmp/include/SNMPv2-MIB.hrl&quot;</span><span·class="p"·data-group-id="3708236474-1">)</span><span·class="p">.</span></code></pre><p>The·initial·values·for·the·managed·objects·defined·in·these·tables,·are·read·at311 your·code·as·in·the·following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="1578843322-1">(</span><span·class="s">&quot;snmp/include/SNMPv2-MIB.hrl&quot;</span><span·class="p"·data-group-id="1578843322-1">)</span><span·class="p">.</span></code></pre><p>The·initial·values·for·the·managed·objects·defined·in·these·tables,·are·read·at
312 start-up·from·a·set·of·configuration·files.·These·are·described·in312 start-up·from·a·set·of·configuration·files.·These·are·described·in
313 <a·href="snmp_config.html">Configuration·Files</a>.</p><h3·id="standard-mib-and-snmpv2-mib"·class="section-heading">313 <a·href="snmp_config.html">Configuration·Files</a>.</p><h3·id="standard-mib-and-snmpv2-mib"·class="section-heading">
314 ··<a·href="#standard-mib-and-snmpv2-mib"·class="hover-link">314 ··<a·href="#standard-mib-and-snmpv2-mib"·class="hover-link">
315 ····<i·class="ri-link-m"·aria-hidden="true"></i>315 ····<i·class="ri-link-m"·aria-hidden="true"></i>
316 ··</a>316 ··</a>
317 ··<span·class="text">STANDARD-MIB·and·SNMPv2-MIB</span>317 ··<span·class="text">STANDARD-MIB·and·SNMPv2-MIB</span>
318 </h3>318 </h3>
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465 ····<i·class="ri-link-m"·aria-hidden="true"></i>465 ····<i·class="ri-link-m"·aria-hidden="true"></i>
466 ··</a>466 ··</a>
467 ··<span·class="text">Notifications</span>467 ··<span·class="text">Notifications</span>
468 </h2>468 </h2>
469 <p>Notifications·are·defined·in·SMIv1·with·the·TRAP-TYPE·macro·in·the·definition·of469 <p>Notifications·are·defined·in·SMIv1·with·the·TRAP-TYPE·macro·in·the·definition·of
470 an·MIB·(see·RFC1215).·The·corresponding·macro·in·SMIv2·is·NOTIFICATION-TYPE.470 an·MIB·(see·RFC1215).·The·corresponding·macro·in·SMIv2·is·NOTIFICATION-TYPE.
471 When·an·application·decides·to·send·a·notification,·it·calls·one·of·the471 When·an·application·decides·to·send·a·notification,·it·calls·one·of·the
472 following·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">send_notification</span><span·class="p"·data-group-id="9487017358-1">(</span><span·class="n">Agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Notification</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Receiver</span><span·class="w">472 following·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">send_notification</span><span·class="p"·data-group-id="7719457823-1">(</span><span·class="n">Agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Notification</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Receiver</span><span·class="w">
473 ·······················</span><span·class="p"·data-group-id="9487017358-2">[</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NotifyName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContextName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Varbind[·...·truncated·by·diffoscope;·len:·102,·SHA:·a047d5e26b3752469b24f0fef20643dfb636963a4d871a2e32b7c6fbd716cc09·...·]-1">)</span><span·class="w">473 ·······················</span><span·class="p"·data-group-id="7719457823-2">[</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NotifyName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContextName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Varbind[·...·truncated·by·diffoscope;·len:·102,·SHA:·bed39766e2a2f04e87985ab0040a59aee9040033f8c30a57c4d4b959aa29ceb2·...·]-1">)</span><span·class="w">
474 </span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">send_trap</span><span·class="p"·data-group-id="9487017358-3">(</span><span·class="n">Agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Notification</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Community</span><span·class="w">·</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·286,·SHA:·4dd3e7f35bcac8006c799ec5ea3b6e03b03370acc9570123931601644e738ca4·...·]-3">)</span></code></pre><p>providing·the·registered·name·or·process·identifier·of·the·agent·where·the·MIB,474 </span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">send_trap</span><span·class="p"·data-group-id="7719457823-3">(</span><span·class="n">Agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Notification</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Community</span><span·class="w">·</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·286,·SHA:·0b35710efb3bf3f4910a3a2272f719284f648e7e6f2142df012e21a84510c881·...·]-3">)</span></code></pre><p>providing·the·registered·name·or·process·identifier·of·the·agent·where·the·MIB,
475 which·defines·the·notification·is·loaded·and·the·symbolic·name·of·the475 which·defines·the·notification·is·loaded·and·the·symbolic·name·of·the
476 notification.</p><p>If·the·<code·class="inline">send_notification/3,4</code>·function·is·used,·all·management·targets·are476 notification.</p><p>If·the·<code·class="inline">send_notification/3,4</code>·function·is·used,·all·management·targets·are
477 selected,·as·defined·in·RFC2273.·The·<code·class="inline">Receiver</code>·parameter·defines·where·the477 selected,·as·defined·in·RFC2273.·The·<code·class="inline">Receiver</code>·parameter·defines·where·the
478 agent·should·send·information·about·the·delivery·of·inform·requests.</p><p>If·the·<code·class="inline">send_notification/5</code>·function·is·used,·an·<code·class="inline">NotifyName</code>·must·be·provided.478 agent·should·send·information·about·the·delivery·of·inform·requests.</p><p>If·the·<code·class="inline">send_notification/5</code>·function·is·used,·an·<code·class="inline">NotifyName</code>·must·be·provided.
479 This·parameter·is·used·as·an·index·in·the·<code·class="inline">snmpNotifyTable</code>,·and·the·management479 This·parameter·is·used·as·an·index·in·the·<code·class="inline">snmpNotifyTable</code>,·and·the·management
480 targets·defined·by·that·single·entry·is·used.</p><p>The·<code·class="inline">send_notification/6</code>·function·is·the·most·general·version·of·the·function.480 targets·defined·by·that·single·entry·is·used.</p><p>The·<code·class="inline">send_notification/6</code>·function·is·the·most·general·version·of·the·function.
481 A·<code·class="inline">ContextName</code>·must·be·specified,·from·which·the·notification·will·be·sent.·If481 A·<code·class="inline">ContextName</code>·must·be·specified,·from·which·the·notification·will·be·sent.·If
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611 ······<p·class="built-using">611 ······<p·class="built-using">
612 ········Built·using612 ········Built·using
613 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the613 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
614 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>614 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
615 ······</p>615 ······</p>
616 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>616 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
617 ····</footer>617 ····</footer>
618 ··</div>618 ··</div>
619 </main>619 </main>
620 </div>620 </div>
621 <script>621 <script>
622 ··function·mermaidLoaded()·{622 ··function·mermaidLoaded()·{
623 ····mermaid.initialize({623 ····mermaid.initialize({
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263 ······<p·class="built-using">263 ······<p·class="built-using">
264 ········Built·using264 ········Built·using
265 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the265 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
266 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>266 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
267 ······</p>267 ······</p>
268 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>268 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
269 ····</footer>269 ····</footer>
270 ··</div>270 ··</div>
271 </main>271 </main>
272 </div>272 </div>
273 <script>273 <script>
274 ··function·mermaidLoaded()·{274 ··function·mermaidLoaded()·{
275 ····mermaid.initialize({275 ····mermaid.initialize({
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136 ··<a·href="#configuration"·class="hover-link">136 ··<a·href="#configuration"·class="hover-link">
137 ····<i·class="ri-link-m"·aria-hidden="true"></i>137 ····<i·class="ri-link-m"·aria-hidden="true"></i>
138 ··</a>138 ··</a>
139 ··<span·class="text">Configuration</span>139 ··<span·class="text">Configuration</span>
140 </h2>140 </h2>
141 <p>The·following·configuration·parameters·are·defined·for·the·SNMP·application.141 <p>The·following·configuration·parameters·are·defined·for·the·SNMP·application.
142 Refer·to·application(3)·for·more·information·about·configuration·parameters.</p><p>The·snmp·part·of·the·config·file·specifying·the·configuration·parameters·is142 Refer·to·application(3)·for·more·information·about·configuration·parameters.</p><p>The·snmp·part·of·the·config·file·specifying·the·configuration·parameters·is
143 basically·the·following·tuple:</p><pre><code·class="text">······{snmp,·snmp_components_config()}</code></pre><p>A·minimal·config·file·for·starting·a·node·with·both·a·manager·and·an·agent:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="6744953319-1">[</span><span·class="p"·data-group-id="6744953319-2">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">143 basically·the·following·tuple:</p><pre><code·class="text">······{snmp,·snmp_components_config()}</code></pre><p>A·minimal·config·file·for·starting·a·node·with·both·a·manager·and·an·agent:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="1774869399-1">[</span><span·class="p"·data-group-id="1774869399-2">{</span><span·class="ss">snmp</span><span·class="p">,</span><span·class="w">
144 ········</span><span·class="p"·data-group-id="6744953319-3">[</span><span·class="p"·data-group-id="6744953319-4">{</span><span·class="ss">agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6744953319-5">[</span><span·class="p"·data-group-id="6744953319-6">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/tmp/snmp/agent/db&quot;</span><span·class="p"·data-group-id="6744953319-6">}</span><span·class="p">,</span><span·class="w"> 
145 ··················</span><span·class="p"·data-group-id="6744953319-7">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6744953319-8">[</span><span·class="p"·data-group-id="6744953319-9">{</span><span·class="ss">dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/tmp/snmp/agent/conf&quot;</span><span·class="p"·data-group-id="6744953319-9">}</span><span·class="p"·data-group-id="6744953319-8">]</span><span·class="p"·data-group-id="6744953319-7">}</span><span·class="p"·data-group-id="6744953319-5">]</span><span·class="p"·data-group-id="6744953319-4">}</span><span·class="p">,</span><span·class="w"> 
146 ·········</span><span·class="p"·data-group-id="6744953319-10">{</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6744953319-11">[</span><span·class="p"·data-group-id="6744953319-12">{</span><span·c[·...·truncated·by·diffoscope;·len:·355,·SHA:·40dcc8a2690d72d81dafb724accf1c10cfd84749c5f480ab13d6fff9ac459955·...·]">}</span><span·class="p">,</span><span·class="w">144 ········</span><span·class="p"·data-group-id="1774869399-3">[</span><span·class="p"·data-group-id="1774869399-4">{</span><span·class="ss">agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1774869399-5">[</span><span·class="[·...·truncated·by·diffoscope;·len:·214,·SHA:·f78387868e08a2f5cee4d498dc8bbdfc0997fae1ed0243f7db249e18eb6a3db0·...·]">}</span><span·class="p">,</span><span·class="w">
 145 ··················</span><span·class="p"·data-group-id="1774869399-7">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1774869399-8">[</span><span·class="p"·data-group-id="1774869399-9">{</span><span·class="ss">dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/tmp/snmp/agent/conf&quot;</span><span·class="p"·data-group-id="1774869399-9">}</span><span·class="p"·data-group-id="1774869399-8">]</span><span·class="p"·data-group-id="1774869399-7">}</span><span·class="p"·data-group-id="1774869399-5">]</span><span·class="p"·data-group-id="1774869399-4">}</span><span·class="p">,</span><span·class="w">
 146 ·········</span><span·class="p"·data-group-id="1774869399-10">{</span><span·class="ss">manager</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1774869399-11">[</span><span·class="p"·data-group-id="1774869399-12">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1774869399-13">[</span><span·class="p"·data-group-id="1774869399-14">{</span><span·class="ss">dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/tmp/snmp/manager/conf&quot;</span><span·class="p"·data-group-id="1774869399-14">}</span><span·class="p">,</span><span·class="w">
147 ······························</span><span·class="p"·data-group-id="6744953319-15">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/tmp/snmp/manager/db&quot;</span><span·class="p"·data-group-id="6744953319-15">}</span><span·class="p"·data-group-id="6744953319-13">[·...·truncated·by·diffoscope;·len:·263,·SHA:·815b193f9c94196738131f48f01b292ca07e67d1bc59ba5f5a5b5cbb81aa9b42·...·]9-2">}</span><span·class="w">147 ······························</span><span·class="p"·data-group-id="1774869399-15">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/tmp/snmp/manager/db&quot;</span><span·class="p"·data-group-id="1774869399-15">}</span><span·class="p"·data-group-id="1774869399-13">[·...·truncated·by·diffoscope;·len:·263,·SHA:·7e23419a66d7f3ca6082ad34d78f82917848049466f212647e2f755a9d9dac0a·...·]9-2">}</span><span·class="w">
148 ········</span><span·class="p"·data-group-id="6744953319-1">]</span><span·class="w">148 ········</span><span·class="p"·data-group-id="1774869399-1">]</span><span·class="w">
149 ·······</span><span·class="p">}</span><span·class="w">149 ·······</span><span·class="p">}</span><span·class="w">
150 ······</span><span·class="p">]</span><span·class="p">.</span></code></pre><p>Each·snmp·component·has·its·own·set·of·configuration·parameters,·even·though150 ······</span><span·class="p">]</span><span·class="p">.</span></code></pre><p>Each·snmp·component·has·its·own·set·of·configuration·parameters,·even·though
151 some·of·the·types·are·common·to·both·components.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nf">snmp_components_config</span><span·class="p"·data-group-id="7565872288-1">(</span><span·class="p"·data-group-id="7565872288-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7565872288-2">[</span><span·class="nf">snmp_component_config</span><span·c[·...·truncated·by·diffoscope;·len:·139,·SHA:·2ae5da310fd422308bd1757cfed877508ff895341ba71fb79b29cb4f02e94a57·...·]8-2">]</span><span·class="w">151 some·of·the·types·are·common·to·both·components.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nf">snmp_components_config</span><span·class="p"·data-group-id="4725208618-1">(</span><span·class="p"·data-group-id="4725208618-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4725208618-2">[</span><span·class="nf">snmp_component_config</span><span·c[·...·truncated·by·diffoscope;·len:·139,·SHA:·8528fd5e88bb8922976f72e34f84bd96db7d7479fad65e89de0b868647b03ef1·...·]8-2">]</span><span·class="w">
152 ······</span><span·class="nf">snmp_component_config</span><span·class="p"·data-group-id="7565872288-4">(</span><span·class="p"·data-group-id="7565872288-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7565872288-5">{</span><span·class="ss">agent</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·610,·SHA:·433696349d86f15218d0eeeeadd05ca21784271d51a693f2d7e6e7d237035b9d·...·]8-7">}</span><span·class="w">152 ······</span><span·class="nf">snmp_component_config</span><span·class="p"·data-group-id="4725208618-4">(</span><span·class="p"·data-group-id="4725208618-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4725208618-5">{</span><span·class="ss">agent</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·610,·SHA:·16e83c272c6bb58087f1832c2a041386f9bcf0a8fbf8b19e6e47d248cec9724f·...·]8-7">}</span><span·class="w">
153 ······</span><span·class="nf">agent_options</span><span·class="p"·data-group-id="7565872288-9">(</span><span·class="p"·data-group-id="7565872288-9">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7565872288-10">[</span><span·class="nf">agent_option</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·129,·SHA:·3772ca5c0a16839e997f4f0b07d2e32703adfca45b6db87ce98ac3ece9c552dd·...·]8-10">]</span><span·class="w">153 ······</span><span·class="nf">agent_options</span><span·class="p"·data-group-id="4725208618-9">(</span><span·class="p"·data-group-id="4725208618-9">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4725208618-10">[</span><span·class="nf">agent_option</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·129,·SHA:·6a53b87b89c78a5b8d2a54dc7a8680c4c9d18d3548fbcec0dfa0409e14c47363·...·]8-10">]</span><span·class="w">
154 ······</span><span·class="nf">agent_option</span><span·class="p"·data-group-id="7565872288-12">(</span><span·class="p"·data-group-id="7565872288-12">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7565872288-13">{</span><span·class="ss">restart_type</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·219,·SHA:·0b9ba5466dd9b3e6491baf50a091f7c1b9a0907f010c5cb7c90b03d66474480d·...·]8-13">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">154 ······</span><span·class="nf">agent_option</span><span·class="p"·data-group-id="4725208618-12">(</span><span·class="p"·data-group-id="4725208618-12">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4725208618-13">{</span><span·class="ss">restart_type</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·219,·SHA:·145858b0323310b8afce90d20ad81253f48f056aec762d703f05615f5aa92201·...·]8-13">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
155 ·······················</span><span·class="p"·data-group-id="7565872288-15">{</span><span·class="ss">agent_type</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">agent_type</span><span·class="p"·data-group-id="7565872288-16">(</span><span·class="p"·data-group-id="7565872288-16">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·392d019222eb2909d935c3948671ae841b7e1ed214dd1ee5ac9793b4399d7fcb·...·]8-15">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">155 ·······················</span><span·class="p"·data-group-id="4725208618-15">{</span><span·class="ss">agent_type</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">agent_type</span><span·class="p"·data-group-id="4725208618-16">(</span><span·class="p"·data-group-id="4725208618-16">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·49dfa8a90fb83d3000b9a9df78094d9acdba0ce2b606d3384b05e8dadd75cc81·...·]8-15">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
156 ·······················</span><span·class="p"·data-group-id="7565872288-17">{</span><span·class="ss">agent_verbosity</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">verbosity</span><span·class="p"·data-group-id="7565872288-18">(</span><span·class="p"·data-group-id="7565872288-18">)</span><spa[·...·truncated·by·diffoscope;·len:·36,·SHA:·40714b6e39652ce1a15d599ee203dc8a2d7a3484e5901d1972a5fb8c0e4df128·...·]8-17">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">156 ·······················</span><span·class="p"·data-group-id="4725208618-17">{</span><span·class="ss">agent_verbosity</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">verbosity</span><span·class="p"·data-group-id="4725208618-18">(</span><span·class="p"·data-group-id="4725208618-18">)</span><spa[·...·truncated·by·diffoscope;·len:·36,·SHA:·0c8e289ec3cef8165cfcf2314baf71553a8541cd8ba19f44dcc4d5243b718f24·...·]8-17">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">
157 ·······················</span><span·class="p"·data-group-id="7565872288-19">{</span><span·class="ss">discovery</span><span·class="p">,</span><span·class="w">········</span><span·class="nf">agent_discovery</span><span·class="p"·data-group-id="7565872288-20">(</span><span·class="p"·data-group-id="7565872288-20">)</span><span·class="p"·data-group-id="7565872288-19">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w"> 
158 ·······················</span><span·class="p"·data-group-id="7565872288-21">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">versions</span><span·class="p"·data-group-id="7565872288-22">(</span><span·class="p"·data-group-id="7565872288-22">)</span><span[·...·truncated·by·diffoscope;·len:·72,·SHA:·f17167f4aacabc34ac536a20ecf3354032644751a86e8b0dc80c74a750e3ca49·...·]··</span><span·class="p">|</span><span·class="w">157 ·······················</span><span·class="p"·data-group-id="4725208618-19">{</span><span·class="ss">discovery</span><span·class="p">,</span><span·class="w">········</span><span·class="nf">agent_discovery</span><span·class="p"·data-group-id="4725208618-20">(</span><span·class="p"·data-group-id="4725208618-20">)</spa[·...·truncated·by·diffoscope;·len:·72,·SHA:·b4346d981b2f3c6fbb08a082e3dd75dd56e5a2f54ba99b5da354a5c8b2102987·...·]··</span><span·class="p">|</span><span·class="w">
 158 ·······················</span><span·class="p"·data-group-id="4725208618-21">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">versions</span><span·class="p"·data-group-id="4725208618-22">(</span><span·class="p"·data-group-id="4725208618-22">)</span><span·class="p"·data-group-id="4725208618-21">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w">
159 ·······················</span><span·class="p"·data-group-id="7565872288-23">{</span><span·class="ss">gb_max_vbs</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">gb_max_vbs</span><span·class="p"·data-group-id="7565872288-24">(</span><span·class="p"·data-group-id="7565872288-24">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·392d019222eb2909d935c3948671ae841b7e1ed214dd1ee5ac9793b4399d7fcb·...·]8-23">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">159 ·······················</span><span·class="p"·data-group-id="4725208618-23">{</span><span·class="ss">gb_max_vbs</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">gb_max_vbs</span><span·class="p"·data-group-id="4725208618-24">(</span><span·class="p"·data-group-id="4725208618-24">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·49dfa8a90fb83d3000b9a9df78094d9acdba0ce2b606d3384b05e8dadd75cc81·...·]8-23">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
160 ·······················</span><span·class="p"·data-group-id="7565872288-25">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">priority</span><span·class="p"·data-group-id="7565872288-26">(</span><span·class="p"·data-group-id="7565872288-26">)</span><span·class="p"·data-group-id="7565872288-25">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w"> 
161 ·······················</span><span·class="p"·data-group-id="7565872288-27">{</span><span·class="ss">multi_threaded</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">multi_threaded</span><span·class="p"·data-group-id="7565872288-28">(</span><span·class="p"·data-group-id="7565872288-28">)</span[·...·truncated·by·diffoscope;·len:·71,·SHA:·779eaf41025f7ca6f25f9befb2ede94706518506eec95275652ec5506fb99343·...·]···</span><span·class="p">|</span><span·class="w">160 ·······················</span><span·class="p"·data-group-id="4725208618-25">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">priority</span><span·class="p"·data-group-id="4725208618-26">(</span><span·class="p"·data-group-id="4725208618-26">)</span><span[·...·truncated·by·diffoscope;·len:·71,·SHA:·35ac93ba28447d359d59d2da218b27362117765f2e7259f3c4afce3b96d6ad92·...·]···</span><span·class="p">|</span><span·class="w">
 161 ·······················</span><span·class="p"·data-group-id="4725208618-27">{</span><span·class="ss">multi_threaded</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">multi_threaded</span><span·class="p"·data-group-id="4725208618-28">(</span><span·class="p"·data-group-id="4725208618-28">)</span><span·class="p"·data-group-id="4725208618-27">}</span><span·class="w">···</span><span·class="p">|</span><span·class="w">
162 ·······················</span><span·class="p"·data-group-id="7565872288-29">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">db_dir</span><span·class="p"·data-group-id="7565872288-30">(</span><span·class="p"·data-group-id="7565872288-30">)</span><span·c[·...·truncated·by·diffoscope;·len:·33,·SHA:·95fd44ab211b6a65a68c9e90fd60a70e8b89a2378b650e4f479089f27561659e·...·]8-29">}</span><span·class="w">···········</span><span·class="p">|</span><span·class="w">162 ·······················</span><span·class="p"·data-group-id="4725208618-29">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">db_dir</span><span·class="p"·data-group-id="4725208618-30">(</span><span·class="p"·data-group-id="4725208618-30">)</span><span·c[·...·truncated·by·diffoscope;·len:·33,·SHA:·9aaa32df730967191d996c1206e45e041ed8e3e768ef531be928789465af0c3c·...·]8-29">}</span><span·class="w">···········</span><span·class="p">|</span><span·class="w">
163 ·······················</span><span·class="p"·data-group-id="7565872288-31">{</span><span·class="ss">db_init_error</span><span·class="p">,</span><span·class="w">····</span><span·class="nf">db_init_error</span><span·class="p"·data-group-id="7565872288-32">(</span><span·class="p"·data-group-id="7565872288-32">)</span>[·...·truncated·by·diffoscope;·len:·40,·SHA:·c54392759b50a297ed749705f73072bb1f8f8e6230c2d393a536c3745d59ed36·...·]8-31">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">163 ·······················</span><span·class="p"·data-group-id="4725208618-31">{</span><span·class="ss">db_init_error</span><span·class="p">,</span><span·class="w">····</span><span·class="nf">db_init_error</span><span·class="p"·data-group-id="4725208618-32">(</span><span·class="p"·data-group-id="4725208618-32">)</span>[·...·truncated·by·diffoscope;·len:·40,·SHA:·b873de162b3a32f0add3abfe36ffe150669c44863265ff2a056b6bad56d78fb3·...·]8-31">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">
164 ·······················</span><span·class="p"·data-group-id="7565872288-33">{</span><span·class="ss">local_db</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">local_db</span><span·class="p"·data-group-id="7565872288-34">(</span><span·class="p"·data-group-id="7565872288-34">)</span><span[·...·truncated·by·diffoscope;·len:·35,·SHA:·0b5a63852570f553fb0f671d44507df885c36c94ce29c76b34695521aaa8a373·...·]8-33">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w">164 ·······················</span><span·class="p"·data-group-id="4725208618-33">{</span><span·class="ss">local_db</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">local_db</span><span·class="p"·data-group-id="4725208618-34">(</span><span·class="p"·data-group-id="4725208618-34">)</span><span[·...·truncated·by·diffoscope;·len:·35,·SHA:·f3ddab1bacffbc622613b2f4a8194b73c924ccf78afa9c825e868839c137fbb8·...·]8-33">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w">
165 ·······················</span><span·class="p"·data-group-id="7565872288-35">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_net_if</span><span·class="p"·data-group-id="7565872288-36">(</span><span·class="p"·data-group-id="7565872288-36">)</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·418bf6cd4950877d8c8bc04258e8e426919320c54d8a42a430cb28209b5dd06a·...·]8-35">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">165 ·······················</span><span·class="p"·data-group-id="4725208618-35">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_net_if</span><span·class="p"·data-group-id="4725208618-36">(</span><span·class="p"·data-group-id="4725208618-36">)</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·628c21713f4e1f82c961dd1df763b35096585e75acad1f279acefcfcdd50219e·...·]8-35">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
166 ·······················</span><span·class="p"·data-group-id="7565872288-37">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">mibs</span><span·class="p"·data-group-id="7565872288-38">(</span><span·class="p"·data-group-id="7565872288-38">)</span><span·cla[·...·truncated·by·diffoscope;·len:·31,·SHA:·a0842930a5f993ae20b9c46c67d87df3d811a45d5e52ac717761a73532d65d09·...·]8-37">}</span><span·class="w">·············</span><span·class="p">|</span><span·class="w">166 ·······················</span><span·class="p"·data-group-id="4725208618-37">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">mibs</span><span·class="p"·data-group-id="4725208618-38">(</span><span·class="p"·data-group-id="4725208618-38">)</span><span·cla[·...·truncated·by·diffoscope;·len:·31,·SHA:·ea2cda6c4299cc0be5fa714e05b2a946df7d9dc2c5b1d00a1af1576ca2cedb4a·...·]8-37">}</span><span·class="w">·············</span><span·class="p">|</span><span·class="w">
167 ·······················</span><span·class="p"·data-group-id="7565872288-39">{</span><span·class="ss">mib_storage</span><span·class="p">,</span><span·class="w">······</span><span·class="nf">mib_storage</span><span·class="p"·data-group-id="7565872288-40">(</span><span·class="p"·data-group-id="7565872288-40">)</span><s[·...·truncated·by·diffoscope;·len:·38,·SHA:·c408fbfcceb68cad350e6bb787e3d983eb770943e3d780a774fc35cfcdfd3612·...·]8-39">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">167 ·······················</span><span·class="p"·data-group-id="4725208618-39">{</span><span·class="ss">mib_storage</span><span·class="p">,</span><span·class="w">······</span><span·class="nf">mib_storage</span><span·class="p"·data-group-id="4725208618-40">(</span><span·class="p"·data-group-id="4725208618-40">)</span><s[·...·truncated·by·diffoscope;·len:·38,·SHA:·9fc0e9dbf5ec9f3b4c6bea7c6006f3bf402b3b9985fbdcf8a7cf01953134e1b3·...·]8-39">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">
168 ·······················</span><span·class="p"·data-group-id="7565872288-41">{</span><span·class="ss">mib_server</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">mib_server</span><span·class="p"·data-group-id="7565872288-42">(</span><span·class="p"·data-group-id="7565872288-42">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·392d019222eb2909d935c3948671ae841b7e1ed214dd1ee5ac9793b4399d7fcb·...·]8-41">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">168 ·······················</span><span·class="p"·data-group-id="4725208618-41">{</span><span·class="ss">mib_server</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">mib_server</span><span·class="p"·data-group-id="4725208618-42">(</span><span·class="p"·data-group-id="4725208618-42">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·49dfa8a90fb83d3000b9a9df78094d9acdba0ce2b606d3384b05e8dadd75cc81·...·]8-41">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
169 ·······················</span><span·class="p"·data-group-id="7565872288-43">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="7565872288-44">(</span><span·class="p"·data-group-id="7565872288-44">)</spa[·...·truncated·by·diffoscope;·len:·42,·SHA:·f7a5f6df729953af6914162159f29f6dd225c26ca025e9148fe9f512d648effb·...·]8-43">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">169 ·······················</span><span·class="p"·data-group-id="4725208618-43">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="4725208618-44">(</span><span·class="p"·data-group-id="4725208618-44">)</spa[·...·truncated·by·diffoscope;·len:·42,·SHA:·2b3bb77c061947af5c8bcafce6398d92535a01808de54cf6d7f8ea0b29ffb54c·...·]8-43">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
170 ·······················</span><span·class="p"·data-group-id="7565872288-45">{</span><span·class="ss">error_report_mod</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">error_report_mod</span><span·class="p"·data-group-id="7565872288-46">(</span><span·class="p"·data-group-id="7565872288-46">)</sp[·...·truncated·by·diffoscope;·len:·43,·SHA:·15bf1cf7ef4bb7677166bcae2475c1ad8c420b3df6e7498adc9ad08bc9c66189·...·]8-45">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">170 ·······················</span><span·class="p"·data-group-id="4725208618-45">{</span><span·class="ss">error_report_mod</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">error_report_mod</span><span·class="p"·data-group-id="4725208618-46">(</span><span·class="p"·data-group-id="4725208618-46">)</sp[·...·truncated·by·diffoscope;·len:·43,·SHA:·b56202ec0bb3a2d89bde679e4070ff82ea2ee4ba01d0a01e754959efc8de2e37·...·]8-45">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
171 ·······················</span><span·class="p"·data-group-id="7565872288-47">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">note_store</span><span·class="p"·data-group-id="7565872288-48">(</span><span·class="p"·data-group-id="7565872288-48">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·392d019222eb2909d935c3948671ae841b7e1ed214dd1ee5ac9793b4399d7fcb·...·]8-47">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">171 ·······················</span><span·class="p"·data-group-id="4725208618-47">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">note_store</span><span·class="p"·data-group-id="4725208618-48">(</span><span·class="p"·data-group-id="4725208618-48">)</span><sp[·...·truncated·by·diffoscope;·len:·37,·SHA:·49dfa8a90fb83d3000b9a9df78094d9acdba0ce2b606d3384b05e8dadd75cc81·...·]8-47">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
172 ·······················</span><span·class="p"·data-group-id="7565872288-49">{</span><span·class="ss">symbolic_store</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">symbolic_store</span><span·class="p"·data-group-id="7565872288-50">(</span><span·class="p"·data-group-id="7565872288-50">)</span[·...·truncated·by·diffoscope;·len:·41,·SHA:·d894e3c18ed36e3b904f4fab11d55947ac2894bedad37b44b7e5e0e76bac17a3·...·]8-49">}</span><span·class="w">···</span><span·class="p">|</span><span·class="w">172 ·······················</span><span·class="p"·data-group-id="4725208618-49">{</span><span·class="ss">symbolic_store</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">symbolic_store</span><span·class="p"·data-group-id="4725208618-50">(</span><span·class="p"·data-group-id="4725208618-50">)</span[·...·truncated·by·diffoscope;·len:·41,·SHA:·8fad7578f7ffee6f996ac6dbb54833ccf5497a9e6c11cbe43539d4dee24b64d0·...·]8-49">}</span><span·class="w">···</span><span·class="p">|</span><span·class="w">
173 ·······················</span><span·class="p"·data-group-id="7565872288-51">{</span><span·class="ss">target_cache</span><span·class="p">,</span><span·class="w">·····</span><span·class="nf">target_cache</span><span·class="p"·data-group-id="7565872288-52">(</span><span·class="p"·data-group-id="7565872288-52">)</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·418bf6cd4950877d8c8bc04258e8e426919320c54d8a42a430cb28209b5dd06a·...·]8-51">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">173 ·······················</span><span·class="p"·data-group-id="4725208618-51">{</span><span·class="ss">target_cache</span><span·class="p">,</span><span·class="w">·····</span><span·class="nf">target_cache</span><span·class="p"·data-group-id="4725208618-52">(</span><span·class="p"·data-group-id="4725208618-52">)</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·628c21713f4e1f82c961dd1df763b35096585e75acad1f279acefcfcdd50219e·...·]8-51">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
174 ·······················</span><span·class="p"·data-group-id="7565872288-53">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_config</span><span·class="p"·data-group-id="7565872288-54">(</span><span·class="p"·data-group-id="7565872288-54">)</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·418bf6cd4950877d8c8bc04258e8e426919320c54d8a42a430cb28209b5dd06a·...·]8-53">}</span><span·class="w">174 ·······················</span><span·class="p"·data-group-id="4725208618-53">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_config</span><span·class="p"·data-group-id="4725208618-54">(</span><span·class="p"·data-group-id="4725208618-54">)</span><[·...·truncated·by·diffoscope;·len:·39,·SHA:·628c21713f4e1f82c961dd1df763b35096585e75acad1f279acefcfcdd50219e·...·]8-53">}</span><span·class="w">
175 ······</span><span·class="nf">manager_options</span><span·class="p"·data-group-id="7565872288-55">(</span><span·class="p"·data-group-id="7565872288-55">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7565872288-56">[</span><span·class="nf">manager_option</span><span·class="p"[·...·truncated·by·diffoscope;·len:·133,·SHA:·850aecf7c05d17a5445725814390309f08052d6d5599985d1072d306a34973d3·...·]8-56">]</span><span·class="w">175 ······</span><span·class="nf">manager_options</span><span·class="p"·data-group-id="4725208618-55">(</span><span·class="p"·data-group-id="4725208618-55">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4725208618-56">[</span><span·class="nf">manager_option</span><span·class="p"[·...·truncated·by·diffoscope;·len:·133,·SHA:·161b9fc2842c6ffd4e44b711abbe0272da8c4b726c1cf0e4b261731cb765362a·...·]8-56">]</span><span·class="w">
176 ······</span><span·class="nf">manager_option</span><span·class="p"·data-group-id="7565872288-58">(</span><span·class="p"·data-group-id="7565872288-58">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7565872288-59">{</span><span·class="ss">restart_type</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·227,·SHA:·290d25f456cf8fa3d59750259eb101744c4f64d9711479109b33848020b628f2·...·]8-59">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">176 ······</span><span·class="nf">manager_option</span><span·class="p"·data-group-id="4725208618-58">(</span><span·class="p"·data-group-id="4725208618-58">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4725208618-59">{</span><span·class="ss">restart_type</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·227,·SHA:·628069e52ff9504fc03aa345afee266d1dbee19ce56e948597e0fe2694fb894e·...·]8-59">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">
177 ·························</span><span·class="p"·data-group-id="7565872288-61">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_net_if</span><span·class="p"·data-group-id="7565872288-62">(</span><span·class="p"·data-group-id="7565872288-62"[·...·truncated·by·diffoscope;·len:·49,·SHA:·6b39aece02b812dd81447cfe5cd1b7b9766ea2a515e3394c289fc93bb8f87b27·...·]8-61">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">177 ·························</span><span·class="p"·data-group-id="4725208618-61">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_net_if</span><span·class="p"·data-group-id="4725208618-62">(</span><span·class="p"·data-group-id="4725208618-62"[·...·truncated·by·diffoscope;·len:·49,·SHA:·c4f0023c5173ec175c879446c2f91b7e187b97b07f70f9c2eba263beab175105·...·]8-61">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
178 ·························</span><span·class="p"·data-group-id="7565872288-63">{</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">server</span><span·class="p"·data-group-id="7565872288-64">(</span><span·class="p"·data-group-id="7565872288-64">)</span[·...·truncated·by·diffoscope;·len:·41,·SHA:·d894e3c18ed36e3b904f4fab11d55947ac2894bedad37b44b7e5e0e76bac17a3·...·]8-63">}</span><span·class="w">··········</span><span·class="p">|</span><span·class="w">178 ·························</span><span·class="p"·data-group-id="4725208618-63">{</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">server</span><span·class="p"·data-group-id="4725208618-64">(</span><span·class="p"·data-group-id="4725208618-64">)</span[·...·truncated·by·diffoscope;·len:·41,·SHA:·8fad7578f7ffee6f996ac6dbb54833ccf5497a9e6c11cbe43539d4dee24b64d0·...·]8-63">}</span><span·class="w">··········</span><span·class="p">|</span><span·class="w">
179 ·························</span><span·class="p"·data-group-id="7565872288-65">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">···············</span><span·class="nf">note_store</span><span·class="p"·data-group-id="7565872288-66">(</span><span·class="p"·data-group-id="7565872288-66">)</[·...·truncated·by·diffoscope;·len:·45,·SHA:·c045b56dcf76f25e1e8af7a029750561019c0343aa22889debde684c5a4309d4·...·]8-65">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">179 ·························</span><span·class="p"·data-group-id="4725208618-65">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">···············</span><span·class="nf">note_store</span><span·class="p"·data-group-id="4725208618-66">(</span><span·class="p"·data-group-id="4725208618-66">)</[·...·truncated·by·diffoscope;·len:·45,·SHA:·d59293a850bd7261f4749e2c5c7447f34156c792eddd335ef613c44c998b5d72·...·]8-65">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">
180 ·························</span><span·class="p"·data-group-id="7565872288-67">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_config</span><span·class="p"·data-group-id="7565872288-68">(</span><span·class="p"·data-group-id="7565872288-68"[·...·truncated·by·diffoscope;·len:·49,·SHA:·6b39aece02b812dd81447cfe5cd1b7b9766ea2a515e3394c289fc93bb8f87b27·...·]8-67">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">180 ·························</span><span·class="p"·data-group-id="4725208618-67">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_config</span><span·class="p"·data-group-id="4725208618-68">(</span><span·class="p"·data-group-id="4725208618-68"[·...·truncated·by·diffoscope;·len:·49,·SHA:·c4f0023c5173ec175c879446c2f91b7e187b97b07f70f9c2eba263beab175105·...·]8-67">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
181 ·························</span><span·class="p"·data-group-id="7565872288-69">{</span><span·class="ss">inform_request_behaviour</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">manager_irb</span><span·class="p"·data-group-id="7565872288-70">(</span><span·class="p"·data-group-id="7565872288-70">)<[·...·truncated·by·diffoscope;·len:·46,·SHA:·cfaefa5d6f19948c10498aa2b920a5655f38baa91f0563a998d89b2cbc5fc16a·...·]8-69">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">181 ·························</span><span·class="p"·data-group-id="4725208618-69">{</span><span·class="ss">inform_request_behaviour</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">manager_irb</span><span·class="p"·data-group-id="4725208618-70">(</span><span·class="p"·data-group-id="4725208618-70">)<[·...·truncated·by·diffoscope;·len:·46,·SHA:·34064819a4072cbac6f96dabdf8928ed072ffeebf85f7748977bd39fa696adef·...·]8-69">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
182 ·························</span><span·class="p"·data-group-id="7565872288-71">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·····················</span><span·class="nf">manager_mibs</span><span·class="p"·data-group-id="7565872288-72">(</span><span·class="p"·data-group-id="7565872288-72">)[·...·truncated·by·diffoscope;·len:·47,·SHA:·ad46043580f97f97b71ff2b81e112925883dbc2f7a9a56061fb5752d05980af1·...·]8-71">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">182 ·························</span><span·class="p"·data-group-id="4725208618-71">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·····················</span><span·class="nf">manager_mibs</span><span·class="p"·data-group-id="4725208618-72">(</span><span·class="p"·data-group-id="4725208618-72">)[·...·truncated·by·diffoscope;·len:·47,·SHA:·daf8b0d36506ea39534e695213f10d5a926b37291e9c720d9c44ee066341ab0f·...·]8-71">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">
183 ·························</span><span·class="p"·data-group-id="7565872288-73">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">priority</span><span·class="p"·data-group-id="7565872288-74">(</span><span·class="p"·data-group-id="7565872288-74">)</sp[·...·truncated·by·diffoscope;·len:·43,·SHA:·15bf1cf7ef4bb7677166bcae2475c1ad8c420b3df6e7498adc9ad08bc9c66189·...·]8-73">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">183 ·························</span><span·class="p"·data-group-id="4725208618-73">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">priority</span><span·class="p"·data-group-id="4725208618-74">(</span><span·class="p"·data-group-id="4725208618-74">)</sp[·...·truncated·by·diffoscope;·len:·43,·SHA:·b56202ec0bb3a2d89bde679e4070ff82ea2ee4ba01d0a01e754959efc8de2e37·...·]8-73">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">
184 ·························</span><span·class="p"·data-group-id="7565872288-75">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··········</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="7565872288-76">(</span><span·class="p"·data-group-id="7565872288-76[·...·truncated·by·diffoscope;·len:·50,·SHA:·683589d641f15cd0208c020c0d0adda82753e188b3cae587ad5936db7d7ed125·...·]8-75">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">184 ·························</span><span·class="p"·data-group-id="4725208618-75">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··········</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="4725208618-76">(</span><span·class="p"·data-group-id="4725208618-76[·...·truncated·by·diffoscope;·len:·50,·SHA:·711c243cc011000cc9bd4ea05a1cc632c38664ad3db14e8d04ad51de52511105·...·]8-75">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
185 ·························</span><span·class="p"·data-group-id="7565872288-77">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">versions</span><span·class="p"·data-group-id="7565872288-78">(</span><span·class="p"·data-group-id="7565872288-78">)</sp[·...·truncated·by·diffoscope;·len:·43,·SHA:·15bf1cf7ef4bb7677166bcae2475c1ad8c420b3df6e7498adc9ad08bc9c66189·...·]8-77">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">185 ·························</span><span·class="p"·data-group-id="4725208618-77">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">versions</span><span·class="p"·data-group-id="4725208618-78">(</span><span·class="p"·data-group-id="4725208618-78">)</sp[·...·truncated·by·diffoscope;·len:·43,·SHA:·b56202ec0bb3a2d89bde679e4070ff82ea2ee4ba01d0a01e754959efc8de2e37·...·]8-77">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">
186 ·························</span><span·class="p"·data-group-id="7565872288-79">{</span><span·class="ss">def_user_mod</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">def_user_module</span><span·class="p"·data-group-id="7565872288-80">(</span><span·class="p"·data-group-id="7565872288-80">)</span><span·class="w">··</span><span·class="p">|</span><span·class="w">186 ·························</span><span·class="p"·data-group-id="4725208618-79">{</span><span·class="ss">def_user_mod</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">def_user_module</span><span·class="p"·data-group-id="4725208618-80">(</span><span·class="p"·data-group-id="4725208618-80">)</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
187 ·························</span><span·class="p"·data-group-id="7565872288-81">{</span><span·class="ss">def_user_data</span><span·class="p">,</span><span·class="w">············</span><span·class="nf">def_user_data</span><span·class="p"·data-group-id="7565872288-82">(</span><span·class="p"·data-group-id="7565872288-82">[·...·truncated·by·diffoscope;·len:·48,·SHA:·4ff7d4f0908dd3e2bd9bcc24977b8bf5e9449588cfc6cd147320d3b2a797bdb4·...·]8-81">}</span></code></pre><p><a·href=""·id="agent_opts_and_types"></a></p><p>Agent·specific·config·options·and·types:</p><ul><li><p><strong><code·class="inline"·id="agent_type">agent_type()·=·master·|·sub·&lt;optional&gt;</code></strong>·-·If·<code·class="inline">master</code>,187 ·························</span><span·class="p"·data-group-id="4725208618-81">{</span><span·class="ss">def_user_data</span><span·class="p">,</span><span·class="w">············</span><span·class="nf">def_user_data</span><span·class="p"·data-group-id="4725208618-82">(</span><span·class="p"·data-group-id="4725208618-82">[·...·truncated·by·diffoscope;·len:·48,·SHA:·885a747d14ea2dd588fb5c9b6249eabd66aba86b4d491dee872e445ddfa29b16·...·]8-81">}</span></code></pre><p><a·href=""·id="agent_opts_and_types"></a></p><p>Agent·specific·config·options·and·types:</p><ul><li><p><strong><code·class="inline"·id="agent_type">agent_type()·=·master·|·sub·&lt;optional&gt;</code></strong>·-·If·<code·class="inline">master</code>,
188 one·master·agent·is·started.·Otherwise,·no·agents·are·started.</p><p>Default·is·<code·class="inline">master</code>.</p></li><li><p><strong><code·class="inline"·id="agent_disco">agent_discovery()·=·[agent_discovery_opt()]·&lt;optional&gt;</code></strong>·-188 one·master·agent·is·started.·Otherwise,·no·agents·are·started.</p><p>Default·is·<code·class="inline">master</code>.</p></li><li><p><strong><code·class="inline"·id="agent_disco">agent_discovery()·=·[agent_discovery_opt()]·&lt;optional&gt;</code></strong>·-
189 <code·class="inline">agent_discovery_opt()·=·{terminating,·agent_terminating_discovery_opts()}·|·{originating,·agent_originating_discovery_opts()}</code></p><p>The·<code·class="inline">terminating</code>·options·effects·discovery·initiated·by·a·manager.</p><p>The·<code·class="inline">originating</code>·options·effects·discovery·initiated·by·this·agent.</p><p>For·defaults·see·the·options·in·<code·class="inline">agent_discovery_opt()</code>.</p></li><li><p><strong><code·class="inline"·id="agent_term_disco_opts">agent_terminating_discovery_opts()·=·[agent_terminating_discovery_opt()]·&lt;optional&gt;</code></strong>·-189 <code·class="inline">agent_discovery_opt()·=·{terminating,·agent_terminating_discovery_opts()}·|·{originating,·agent_originating_discovery_opts()}</code></p><p>The·<code·class="inline">terminating</code>·options·effects·discovery·initiated·by·a·manager.</p><p>The·<code·class="inline">originating</code>·options·effects·discovery·initiated·by·this·agent.</p><p>For·defaults·see·the·options·in·<code·class="inline">agent_discovery_opt()</code>.</p></li><li><p><strong><code·class="inline"·id="agent_term_disco_opts">agent_terminating_discovery_opts()·=·[agent_terminating_discovery_opt()]·&lt;optional&gt;</code></strong>·-
190 <code·class="inline">agent_terminating_discovery_opt()·=·{enable,·boolean()}·|·{stage2,·discovery·|·plain}·|·{trigger_username,·string()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">terminating</code>·in·this·agent·(i.e.190 <code·class="inline">agent_terminating_discovery_opt()·=·{enable,·boolean()}·|·{stage2,·discovery·|·plain}·|·{trigger_username,·string()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">terminating</code>·in·this·agent·(i.e.
191 initiated·by·a·manager).</p><p>The·default·values·for·the·<code·class="inline">terminating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li><li>stage2:·<code·class="inline">discovery</code></li><li>trigger_username:·<code·class="inline">&quot;&quot;</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_orig_disco_opts">agent_originating_discovery_opts()·=·[agent_originating_discovery_opt()]·&lt;optional&gt;</code></strong>·-191 initiated·by·a·manager).</p><p>The·default·values·for·the·<code·class="inline">terminating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li><li>stage2:·<code·class="inline">discovery</code></li><li>trigger_username:·<code·class="inline">&quot;&quot;</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_orig_disco_opts">agent_originating_discovery_opts()·=·[agent_originating_discovery_opt()]·&lt;optional&gt;</code></strong>·-
192 <code·class="inline">agent_originating_discovery_opt()·=·{enable,·boolean()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">originating</code>·in·this·agent.</p><p>The·default·values·for·the·<code·class="inline">originating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_mt">multi_threaded()·=·bool()·|·extended·&lt;optional&gt;</code></strong>·-·If192 <code·class="inline">agent_originating_discovery_opt()·=·{enable,·boolean()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">originating</code>·in·this·agent.</p><p>The·default·values·for·the·<code·class="inline">originating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_mt">multi_threaded()·=·bool()·|·extended·&lt;optional&gt;</code></strong>·-·If
193 <code·class="inline">true</code>·(or·<code·class="inline">extended</code>),·the·agent·is·multi-threaded,·with·one·thread·for·each193 <code·class="inline">true</code>·(or·<code·class="inline">extended</code>),·the·agent·is·multi-threaded,·with·one·thread·for·each
194 get·request.</p><p>The·value·<code·class="inline">extended</code>·means·that·a·special·'process'·is·also·created·intended194 get·request.</p><p>The·value·<code·class="inline">extended</code>·means·that·a·special·'process'·is·also·created·intended
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424 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>424 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
425 ······</p>425 ······</p>
426 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>426 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
427 ····</footer>427 ····</footer>
428 ··</div>428 ··</div>
429 </main>429 </main>
430 </div>430 </div>
431 <script>431 <script>
432 ··function·mermaidLoaded()·{432 ··function·mermaidLoaded()·{
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183 ······</p>183 ······</p>
184 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>184 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
185 ····</footer>185 ····</footer>
186 ··</div>186 ··</div>
187 </main>187 </main>
188 </div>188 </div>
189 <script>189 <script>
190 ··function·mermaidLoaded()·{190 ··function·mermaidLoaded()·{
191 ····mermaid.initialize({191 ····mermaid.initialize({
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652 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>652 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
653 ······</p>653 ······</p>
654 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>654 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
655 ····</footer>655 ····</footer>
656 ··</div>656 ··</div>
657 </main>657 </main>
658 </div>658 </div>
659 <script>659 <script>
660 ··function·mermaidLoaded()·{660 ··function·mermaidLoaded()·{
661 ····mermaid.initialize({661 ····mermaid.initialize({
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189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>189 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
190 ······</p>190 ······</p>
191 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>191 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
192 ····</footer>192 ····</footer>
193 ··</div>193 ··</div>
194 </main>194 </main>
195 </div>195 </div>
196 <script>196 <script>
197 ··function·mermaidLoaded()·{197 ··function·mermaidLoaded()·{
198 ····mermaid.initialize({198 ····mermaid.initialize({
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201 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>201 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
202 ······</p>202 ······</p>
203 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>203 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
204 ····</footer>204 ····</footer>
205 ··</div>205 ··</div>
206 </main>206 </main>
207 </div>207 </div>
208 <script>208 <script>
209 ··function·mermaidLoaded()·{209 ··function·mermaidLoaded()·{
210 ····mermaid.initialize({210 ····mermaid.initialize({
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598 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>598 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
599 ······</p>599 ······</p>
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141 <a·href="snmp_agent_config_files.html">Definition·of·Agent·Configuration·Files</a>·for·more141 <a·href="snmp_agent_config_files.html">Definition·of·Agent·Configuration·Files</a>·for·more
142 information).</li><li>the·<em>database·directory</em>·stores·the·internal·database·files.</li></ul><p>The·following·directory·must·exist·in·the·system·to·run·the·manager:</p><ul><li>the·<em>configuration·directory</em>·stores·all·configuration·files·used·by·the142 information).</li><li>the·<em>database·directory</em>·stores·the·internal·database·files.</li></ul><p>The·following·directory·must·exist·in·the·system·to·run·the·manager:</p><ul><li>the·<em>configuration·directory</em>·stores·all·configuration·files·used·by·the
143 manager·(refer·to·the·chapter143 manager·(refer·to·the·chapter
144 <a·href="snmp_manager_config_files.html">Definition·of·Manager·Configuration·Files</a>·for144 <a·href="snmp_manager_config_files.html">Definition·of·Manager·Configuration·Files</a>·for
145 more·information).</li><li>the·<em>database·directory</em>·stores·the·internal·database·files.</li></ul><p>The·agent·and·manager·uses·(application)·configuration·parameters·to·find·out145 more·information).</li><li>the·<em>database·directory</em>·stores·the·internal·database·files.</li></ul><p>The·agent·and·manager·uses·(application)·configuration·parameters·to·find·out
146 where·these·directories·are·located.·The·parameters·should·be·defined·in·an146 where·these·directories·are·located.·The·parameters·should·be·defined·in·an
147 Erlang·system·configuration·file.·The·following·configuration·parameters·are147 Erlang·system·configuration·file.·The·following·configuration·parameters·are
148 defined·for·the·SNMP·application:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nf">agent_options</span><span·class="p"·data-group-id="5851286435-1">(</span><span·class="p"·data-group-id="5851286435-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5851286435-2">[</span><span·class="nf">agent_option</span><span·class="p"·data-group-id="5851286435-3">(</span><span·class="p"·data-group-id="5851286435-3">)</span><span·class="p"·data-group-id="5851286435-2">]</span><span·class="w"> 
149 ······</span><span·class="nf">agent_option</span><span·class="p"·data-group-id="5851286435-4">(</span><span·class="p"·data-group-id="5851286435-4">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·352,·SHA:·0bb8cd482c5086c4f0d9f9732327abf853150bbcd03a534ce0cd52d3254aae20·...·]</span><span·class="w">148 defined·for·the·SNMP·application:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="nf">agent_options</span><span·class="p"·data-group-id="5163698616-1">(</span><span·class="p"·data-group-id="5163698616-1">)</span[·...·truncated·by·diffoscope;·len:·314,·SHA:·60198f36a09f47c04cc914f997797755cab3cef7c01e5ddbe2ff42a6bfc84f60·...·]</span><span·class="w">
 149 ······</span><span·class="nf">agent_option</span><span·class="p"·data-group-id="5163698616-4">(</span><span·class="p"·data-group-id="5163698616-4">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5163698616-5">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="w">·····</span><span·class="nf">restart_type</span><span·class="p"·data-group-id="5163698616-6">(</span><span·class="p"·data-group-id="5163698616-6">)</span><span·class="p"·data-group-id="5163698616-5">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
150 ·······················</span><span·class="p"·data-group-id="5851286435-7">{</span><span·class="ss">agent_type</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">agent_type</span><span·class="p"·data-group-id="5851286435-8">(</span><span·class="p"·data-group-id="5851286435-8">)</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·6c0d2f32e4ff26bc580c4fa5c446c0c2b907398a360272317691830ccabf3bd7·...·]-7">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">150 ·······················</span><span·class="p"·data-group-id="5163698616-7">{</span><span·class="ss">agent_type</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">agent_type</span><span·class="p"·data-group-id="5163698616-8">(</span><span·class="p"·data-group-id="5163698616-8">)</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·bcc7c45e15d3cad8722c2db761e1582a10fe93ed4e09473542a412594f6db2df·...·]-7">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
151 ·······················</span><span·class="p"·data-group-id="5851286435-9">{</span><span·class="ss">agent_verbosity</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">verbosity</span><span·class="p"·data-group-id="5851286435-10">(</span><span·class="p"·data-group-id="5851286435-10">)</span><span·class="p"·data-group-id="5851286435-9">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w"> 
152 ·······················</span><span·class="p"·data-group-id="5851286435-11">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">versions</span><span·class="p"·data-group-id="5851286435-12">(</span><span·class="p"·data-group-id="5851286435-12">)</span><span·class="p"·data-group-id="5851286435-11">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w"> 
153 ·······················</span><span·class="p"·data-group-id="5851286435-13">{</span><span·class="ss">discovery</span><span·class="p">,</span><span·class="w">········</span><span·class="nf">agent_discovery</span><span·class="p"·data-group-id="5851286435-14">(</span><span·class="p"·data-group-id="5851286435-14">)</span[·...·truncated·by·diffoscope;·len:·71,·SHA:·961670967efe95c5ed1d2f320ca0dd29204cbd04814dc5da75e99f4d00552ec9·...·]··</span><span·class="p">|</span><span·class="w">151 ·······················</span><span·class="p"·data-group-id="5163698616-9">{</span><span·class="ss">agent_verbosity</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">verbosity</span><span·class="p"·data-group-id="5163698616-10">(</span><span·class="p"·data-group-id="5163698616-10">)</span><span·[·...·truncated·by·diffoscope;·len:·69,·SHA:·c25ab75bb7159244f5f49089fc82381808525e61791e50b230dbeb3ff17ac9ed·...·]··</span><span·class="p">|</span><span·class="w">
 152 ·······················</span><span·class="p"·data-group-id="5163698616-11">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">versions</span><span·class="p"·data-group-id="5163698616-12">(</span><span·class="p"·data-group-id="5163698616-12">)</span><span·class="p"·data-group-id="5163698616-11">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w">
 153 ·······················</span><span·class="p"·data-group-id="5163698616-13">{</span><span·class="ss">discovery</span><span·class="p">,</span><span·class="w">········</span><span·class="nf">agent_discovery</span><span·class="p"·data-group-id="5163698616-14">(</span><span·class="p"·data-group-id="5163698616-14">)</span><span·class="p"·data-group-id="5163698616-13">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
154 ·······················</span><span·class="p"·data-group-id="5851286435-15">{</span><span·class="ss">gb_max_vbs</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">gb_max_vbs</span><span·class="p"·data-group-id="5851286435-16">(</span><span·class="p"·data-group-id="5851286435-16">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·5ba0ab0bd395a1ee323a40c76e3125d279227770fa03a5be5b0d4613ed7d130f·...·]-15">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">154 ·······················</span><span·class="p"·data-group-id="5163698616-15">{</span><span·class="ss">gb_max_vbs</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">gb_max_vbs</span><span·class="p"·data-group-id="5163698616-16">(</span><span·class="p"·data-group-id="5163698616-16">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·34a26eda28fcc03946b4625890f92748359b94da11d8a2389d43247eaca929e4·...·]-15">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
155 ·······················</span><span·class="p"·data-group-id="5851286435-17">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">priority</span><span·class="p"·data-group-id="5851286435-18">(</span><span·class="p"·data-group-id="5851286435-18">)</span><span·class="p"·data-group-id="5851286435-17">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w"> 
156 ·······················</span><span·class="p"·data-group-id="5851286435-19">{</span><span·class="ss">multi_threaded</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">multi_threaded</span><span·class="p"·data-group-id="5851286435-20">(</span><span·class="p"·data-group-id="5851286435-20">)</span>[·...·truncated·by·diffoscope;·len:·70,·SHA:·edfd8fdf54022c27a0eb1cdae20681e232cd8301bfc6b4f124746c453d0288bc·...·]···</span><span·class="p">|</span><span·class="w">155 ·······················</span><span·class="p"·data-group-id="5163698616-17">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">priority</span><span·class="p"·data-group-id="5163698616-18">(</span><span·class="p"·data-group-id="5163698616-18">)</span><span·[·...·truncated·by·diffoscope;·len:·70,·SHA:·de00bfad5b41dd7a1db835e88c2db9e08313ef3c2aa0f6f736352d33cdbab5ac·...·]···</span><span·class="p">|</span><span·class="w">
 156 ·······················</span><span·class="p"·data-group-id="5163698616-19">{</span><span·class="ss">multi_threaded</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">multi_threaded</span><span·class="p"·data-group-id="5163698616-20">(</span><span·class="p"·data-group-id="5163698616-20">)</span><span·class="p"·data-group-id="5163698616-19">}</span><span·class="w">···</span><span·class="p">|</span><span·class="w">
157 ·······················</span><span·class="p"·data-group-id="5851286435-21">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">db_dir</span><span·class="p"·data-group-id="5851286435-22">(</span><span·class="p"·data-group-id="5851286435-22">)</span><span·cl[·...·truncated·by·diffoscope;·len:·33,·SHA:·ea6d9f295917008d73f43264ca670e283e1e891c6deb9639eabae47d79d5a5cc·...·]-21">}</span><span·class="w">···········</span><span·class="p">|</span><span·class="w">157 ·······················</span><span·class="p"·data-group-id="5163698616-21">{</span><span·class="ss">db_dir</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">db_dir</span><span·class="p"·data-group-id="5163698616-22">(</span><span·class="p"·data-group-id="5163698616-22">)</span><span·cl[·...·truncated·by·diffoscope;·len:·33,·SHA:·5c6a7152457d622ed1f31fc3296528d8bdd4c82ed8a22dde95a5776c36a1844e·...·]-21">}</span><span·class="w">···········</span><span·class="p">|</span><span·class="w">
158 ·······················</span><span·class="p"·data-group-id="5851286435-23">{</span><span·class="ss">db_init_error</span><span·class="p">,</span><span·class="w">····</span><span·class="nf">db_init_error</span><span·class="p"·data-group-id="5851286435-24">(</span><span·class="p"·data-group-id="5851286435-24">)</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·16835ba9853a2833b49d27977f87a81802d319282dc257edd7268d62c7347337·...·]-23">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">158 ·······················</span><span·class="p"·data-group-id="5163698616-23">{</span><span·class="ss">db_init_error</span><span·class="p">,</span><span·class="w">····</span><span·class="nf">db_init_error</span><span·class="p"·data-group-id="5163698616-24">(</span><span·class="p"·data-group-id="5163698616-24">)</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·e032a211517c4a5a14051d88624e6896784239e300a1d9937a964947fda6d4a3·...·]-23">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">
159 ·······················</span><span·class="p"·data-group-id="5851286435-25">{</span><span·class="ss">local_db</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">local_db</span><span·class="p"·data-group-id="5851286435-26">(</span><span·class="p"·data-group-id="5851286435-26">)</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·85d0b6dc5e664a7f7b37cd638b5be87fe7e7df216ccf0ac5f48508b4f53e6bc0·...·]-25">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w">159 ·······················</span><span·class="p"·data-group-id="5163698616-25">{</span><span·class="ss">local_db</span><span·class="p">,</span><span·class="w">·········</span><span·class="nf">local_db</span><span·class="p"·data-group-id="5163698616-26">(</span><span·class="p"·data-group-id="5163698616-26">)</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·44070eadc46781aac9328048c68a7f73e0ab8cd44fd5c601caeae6caaf3c1160·...·]-25">}</span><span·class="w">·········</span><span·class="p">|</span><span·class="w">
160 ·······················</span><span·class="p"·data-group-id="5851286435-27">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_net_if</span><span·class="p"·data-group-id="5851286435-28">(</span><span·class="p"·data-group-id="5851286435-28">)</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·071a50b8c27c8bbc45f9c602d78845da2349187b6f94fea5e96a774dd94d2b27·...·]-27">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">160 ·······················</span><span·class="p"·data-group-id="5163698616-27">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_net_if</span><span·class="p"·data-group-id="5163698616-28">(</span><span·class="p"·data-group-id="5163698616-28">)</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·4ed1e01aded74cb494718cd3ab7c8f3d3c26a6469e631232219d6adf52e13db7·...·]-27">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
161 ·······················</span><span·class="p"·data-group-id="5851286435-29">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">mibs</span><span·class="p"·data-group-id="5851286435-30">(</span><span·class="p"·data-group-id="5851286435-30">)</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·1e81cb9b37f645f04a18b04ed4ff12fdbb90824582d11671c9991dd93f6a3a2c·...·]-29">}</span><span·class="w">·············</span><span·class="p">|</span><span·class="w">161 ·······················</span><span·class="p"·data-group-id="5163698616-29">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">mibs</span><span·class="p"·data-group-id="5163698616-30">(</span><span·class="p"·data-group-id="5163698616-30">)</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·b4c8bfc4eab688302e1097ab15e208f0655c1393e11dad60fa53fe35110c456f·...·]-29">}</span><span·class="w">·············</span><span·class="p">|</span><span·class="w">
162 ·······················</span><span·class="p"·data-group-id="5851286435-31">{</span><span·class="ss">mib_storage</span><span·class="p">,</span><span·class="w">······</span><span·class="nf">mib_storage</span><span·class="p"·data-group-id="5851286435-32">(</span><span·class="p"·data-group-id="5851286435-32">)</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·8912d99947741a2ca199aaacb485382b8402081a15ef7b27bc4a750dd5dd31b7·...·]-31">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">162 ·······················</span><span·class="p"·data-group-id="5163698616-31">{</span><span·class="ss">mib_storage</span><span·class="p">,</span><span·class="w">······</span><span·class="nf">mib_storage</span><span·class="p"·data-group-id="5163698616-32">(</span><span·class="p"·data-group-id="5163698616-32">)</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·540aeccb0f545800ccd870c77eac9eacf5cc822dc6248255853113221b262cb8·...·]-31">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">
163 ·······················</span><span·class="p"·data-group-id="5851286435-33">{</span><span·class="ss">mib_server</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">mib_server</span><span·class="p"·data-group-id="5851286435-34">(</span><span·class="p"·data-group-id="5851286435-34">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·5ba0ab0bd395a1ee323a40c76e3125d279227770fa03a5be5b0d4613ed7d130f·...·]-33">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">163 ·······················</span><span·class="p"·data-group-id="5163698616-33">{</span><span·class="ss">mib_server</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">mib_server</span><span·class="p"·data-group-id="5163698616-34">(</span><span·class="p"·data-group-id="5163698616-34">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·34a26eda28fcc03946b4625890f92748359b94da11d8a2389d43247eaca929e4·...·]-33">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
164 ·······················</span><span·class="p"·data-group-id="5851286435-35">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="5851286435-36">(</span><span·class="p"·data-group-id="5851286435-36">)</span><span·class="p"·data-group-id="5851286435-35">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w"> 
165 ·······················</span><span·class="p"·data-group-id="5851286435-37">{</span><span·class="ss">error_report_mod</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">error_report_mod</span><span·class="p"·data-group-id="5851286435-38">(</span><span·class="p"·data-group-id="5851286435-38">)</spa[·...·truncated·by·diffoscope;·len:·72,·SHA:·aaea39ae60e4e6ec91ce26188462c4d5714152c3c58bd4e5071679035fdc6323·...·]·</span><span·class="p">|</span><span·class="w">164 ·······················</span><span·class="p"·data-group-id="5163698616-35">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="5163698616-36">(</span><span·class="p"·data-group-id="5163698616-36">)</span[·...·truncated·by·diffoscope;·len:·72,·SHA:·8d199c31273018f62a041426a63b8a7b38970bbece0a211513ab367cb819ebdc·...·]·</span><span·class="p">|</span><span·class="w">
 165 ·······················</span><span·class="p"·data-group-id="5163698616-37">{</span><span·class="ss">error_report_mod</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">error_report_mod</span><span·class="p"·data-group-id="5163698616-38">(</span><span·class="p"·data-group-id="5163698616-38">)</span><span·class="p"·data-group-id="5163698616-37">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
166 ·······················</span><span·class="p"·data-group-id="5851286435-39">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">note_store</span><span·class="p"·data-group-id="5851286435-40">(</span><span·class="p"·data-group-id="5851286435-40">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·5ba0ab0bd395a1ee323a40c76e3125d279227770fa03a5be5b0d4613ed7d130f·...·]-39">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">166 ·······················</span><span·class="p"·data-group-id="5163698616-39">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">·······</span><span·class="nf">note_store</span><span·class="p"·data-group-id="5163698616-40">(</span><span·class="p"·data-group-id="5163698616-40">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·34a26eda28fcc03946b4625890f92748359b94da11d8a2389d43247eaca929e4·...·]-39">}</span><span·class="w">·······</span><span·class="p">|</span><span·class="w">
167 ·······················</span><span·class="p"·data-group-id="5851286435-41">{</span><span·class="ss">symbolic_store</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">symbolic_store</span><span·class="p"·data-group-id="5851286435-42">(</span><span·class="p"·data-group-id="5851286435-42">)</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·98ae105608758da5b90be8b5fe9ac389d3badbc11486ad6ce177f318082f4e75·...·]-41">}</span><span·class="w">···</span><span·class="p">|</span><span·class="w">167 ·······················</span><span·class="p"·data-group-id="5163698616-41">{</span><span·class="ss">symbolic_store</span><span·class="p">,</span><span·class="w">···</span><span·class="nf">symbolic_store</span><span·class="p"·data-group-id="5163698616-42">(</span><span·class="p"·data-group-id="5163698616-42">)</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·257419ea97dc0d25262407131517c8789575080aa771cb880eb5fd069f3f0ced·...·]-41">}</span><span·class="w">···</span><span·class="p">|</span><span·class="w">
168 ·······················</span><span·class="p"·data-group-id="5851286435-43">{</span><span·class="ss">target_cache</span><span·class="p">,</span><span·class="w">·····</span><span·class="nf">target_cache</span><span·class="p"·data-group-id="5851286435-44">(</span><span·class="p"·data-group-id="5851286435-44">)</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·071a50b8c27c8bbc45f9c602d78845da2349187b6f94fea5e96a774dd94d2b27·...·]-43">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">168 ·······················</span><span·class="p"·data-group-id="5163698616-43">{</span><span·class="ss">target_cache</span><span·class="p">,</span><span·class="w">·····</span><span·class="nf">target_cache</span><span·class="p"·data-group-id="5163698616-44">(</span><span·class="p"·data-group-id="5163698616-44">)</span><s[·...·truncated·by·diffoscope;·len:·39,·SHA:·4ed1e01aded74cb494718cd3ab7c8f3d3c26a6469e631232219d6adf52e13db7·...·]-43">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
169 ·······················</span><span·class="p"·data-group-id="5851286435-45">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_config</span><span·class="p"·data-group-id="5851286435-46">(</span><span·class="p"·data-group-id="5851286435-46">)</span><span·class="p"·data-group-id="5851286435-45">}</span><span·class="w"> 
170 ······</span><span·class="nf">manager_options</span><span·class="p"·data-group-id="5851286435-47">(</span><span·class="p"·data-group-id="5851286435-47">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5851286435-48">[</span><span·class="nf">manager_option</span><span·class="p"·data-group-id="5851286435-49">(</span><span·class="p"·data-group-id="5851286435-49">)</span><span·class="p"·data-group-id="5851286435-48">]</span><span·class="w"> 
171 ······</span><span·class="nf">manager_option</span><span·class="p"·data-group-id="5851286435-50">(</span><span·class="p"·data-group-id="5851286435-50">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·361,·SHA:·2b5c2969bce7db195ce9574fa32e41b3d223c0081abe8300851604ebd1d7fc2e·...·]</span><span·class="w">169 ·······················</span><span·class="p"·data-group-id="5163698616-45">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···········</span><span·class="nf">agent_config</span><span·class="p"·data-group-id="5163698616-46">(</span>[·...·truncated·by·diffoscope;·len:·101,·SHA:·d314ff44cb64ca741ecda120083b5e5beb242d489d232a718769fc8bd35e4aff·...·]</span><span·class="w">
 170 ······</span><span·class="nf">manager_options</span><span·class="p"·data-group-id="5163698616-47">(</span><span·class="p"·data-group-id="5163698616-47">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5163698616-48">[</span><span·class="nf">manager_option</span><span·class="p"·data-group-id="5163698616-49">(</span><span·class="p"·data-group-id="5163698616-49">)</span><span·class="p"·data-group-id="5163698616-48">]</span><span·class="w">
 171 ······</span><span·class="nf">manager_option</span><span·class="p"·data-group-id="5163698616-50">(</span><span·class="p"·data-group-id="5163698616-50">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5163698616-51">{</span><span·class="ss">restart_type</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">restart_type</span><span·class="p"·data-group-id="5163698616-52">(</span><span·class="p"·data-group-id="5163698616-52">)</span><span·class="p"·data-group-id="5163698616-51">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">
172 ·························</span><span·class="p"·data-group-id="5851286435-53">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_net_if</span><span·class="p"·data-group-id="5851286435-54">(</span><span·class="p"·data-group-id="5851286435-54">[·...·truncated·by·diffoscope;·len:·49,·SHA:·02a7fa5264ebc85034ed3b76402d84d37a776ffc9a78b85a30b067374bb69795·...·]-53">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">172 ·························</span><span·class="p"·data-group-id="5163698616-53">{</span><span·class="ss">net_if</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_net_if</span><span·class="p"·data-group-id="5163698616-54">(</span><span·class="p"·data-group-id="5163698616-54">[·...·truncated·by·diffoscope;·len:·49,·SHA:·b391015189f8473932811e93794b7f67b62eddbc66cf8d0d08283a393dab0a3f·...·]-53">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
173 ·························</span><span·class="p"·data-group-id="5851286435-55">{</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">server</span><span·class="p"·data-group-id="5851286435-56">(</span><span·class="p"·data-group-id="5851286435-56">)</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·98ae105608758da5b90be8b5fe9ac389d3badbc11486ad6ce177f318082f4e75·...·]-55">}</span><span·class="w">··········</span><span·class="p">|</span><span·class="w">173 ·························</span><span·class="p"·data-group-id="5163698616-55">{</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">server</span><span·class="p"·data-group-id="5163698616-56">(</span><span·class="p"·data-group-id="5163698616-56">)</span>[·...·truncated·by·diffoscope;·len:·41,·SHA:·257419ea97dc0d25262407131517c8789575080aa771cb880eb5fd069f3f0ced·...·]-55">}</span><span·class="w">··········</span><span·class="p">|</span><span·class="w">
174 ·························</span><span·class="p"·data-group-id="5851286435-57">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">···············</span><span·class="nf">note_store</span><span·class="p"·data-group-id="5851286435-58">(</span><span·class="p"·data-group-id="5851286435-58">)</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·77717bb615aed5e7d0c1337662d75f80170945363e68255f72bdbd9313daf56c·...·]-57">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">174 ·························</span><span·class="p"·data-group-id="5163698616-57">{</span><span·class="ss">note_store</span><span·class="p">,</span><span·class="w">···············</span><span·class="nf">note_store</span><span·class="p"·data-group-id="5163698616-58">(</span><span·class="p"·data-group-id="5163698616-58">)</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·a7eb0a9add9437878f62699ddf36a63e53a3b7bf7e067e6439a40f29a2ec2eb4·...·]-57">}</span><span·class="w">······</span><span·class="p">|</span><span·class="w">
175 ·························</span><span·class="p"·data-group-id="5851286435-59">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_config</span><span·class="p"·data-group-id="5851286435-60">(</span><span·class="p"·data-group-id="5851286435-60">)</span><span·class="p"·data-group-id="5851286435-59">}</span><span·class="w">··</span><span·class="p">|</span><span·class="w"> 
176 ·························</span><span·class="p"·data-group-id="5851286435-61">{</span><span·class="ss">inform_request_behaviour</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">manager_irb</span><span·class="p"·data-group-id="5851286435-62">(</span><span·class="p"·data-group-id="5851286435-62">)</[·...·truncated·by·diffoscope;·len:·78,·SHA:·2c07726e6cd84ce0598efd50e7866280d46874a1f921cb2489789ad7b7484fc5·...·]··</span><span·class="p">|</span><span·class="w">175 ·························</span><span·class="p"·data-group-id="5163698616-59">{</span><span·class="ss">config</span><span·class="p">,</span><span·class="w">···················</span><span·class="nf">manager_config</span><span·class="p"·data-group-id="5163698616-60">(</span><span·class="p"·data-group-id="5163698616-60">[·...·truncated·by·diffoscope;·len:·78,·SHA:·667c6a1fc0f52aa528af7fe1dc93643b94ddefd70ca4c533b874065ab4e2cb12·...·]··</span><span·class="p">|</span><span·class="w">
 176 ·························</span><span·class="p"·data-group-id="5163698616-61">{</span><span·class="ss">inform_request_behaviour</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">manager_irb</span><span·class="p"·data-group-id="5163698616-62">(</span><span·class="p"·data-group-id="5163698616-62">)</span><span·class="p"·data-group-id="5163698616-61">}</span><span·class="w">·····</span><span·class="p">|</span><span·class="w">
177 ·························</span><span·class="p"·data-group-id="5851286435-63">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·····················</span><span·class="nf">manager_mibs</span><span·class="p"·data-group-id="5851286435-64">(</span><span·class="p"·data-group-id="5851286435-64">)<[·...·truncated·by·diffoscope;·len:·47,·SHA:·df3f24ae9e9d5b20633860dfa10d1dffae968724b5c69e197e738bc1d0881e64·...·]-63">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">177 ·························</span><span·class="p"·data-group-id="5163698616-63">{</span><span·class="ss">mibs</span><span·class="p">,</span><span·class="w">·····················</span><span·class="nf">manager_mibs</span><span·class="p"·data-group-id="5163698616-64">(</span><span·class="p"·data-group-id="5163698616-64">)<[·...·truncated·by·diffoscope;·len:·47,·SHA:·0c79c72e17b5418da9e2b2a6e3e1b888cffc543a6b9ae21096bec897e6f35c79·...·]-63">}</span><span·class="w">····</span><span·class="p">|</span><span·class="w">
178 ·························</span><span·class="p"·data-group-id="5851286435-65">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">priority</span><span·class="p"·data-group-id="5851286435-66">(</span><span·class="p"·data-group-id="5851286435-66">)</span><span·class="p"·data-group-id="5851286435-65">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w"> 
179 ·························</span><span·class="p"·data-group-id="5851286435-67">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··········</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="5851286435-68">(</span><span·class="p"·data-group-id="5851286435-68"[·...·truncated·by·diffoscope;·len:·79,·SHA:·cbaca2dce22b2361c35b5fc8b2307c97551bd301f194fe50df10846cd893b531·...·]·</span><span·class="p">|</span><span·class="w">178 ·························</span><span·class="p"·data-group-id="5163698616-65">{</span><span·class="ss">priority</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">priority</span><span·class="p"·data-group-id="5163698616-66">(</span><span·class="p"·data-group-id="5163698616-66">)</spa[·...·truncated·by·diffoscope;·len:·79,·SHA:·c495f4525d0a5ca552b92fd004d51b37402d762e5a8248d03811671311be1638·...·]·</span><span·class="p">|</span><span·class="w">
 179 ·························</span><span·class="p"·data-group-id="5163698616-67">{</span><span·class="ss">audit_trail_log</span><span·class="p">,</span><span·class="w">··········</span><span·class="nf">audit_trail_log</span><span·class="p"·data-group-id="5163698616-68">(</span><span·class="p"·data-group-id="5163698616-68">)</span><span·class="p"·data-group-id="5163698616-67">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
180 ·························</span><span·class="p"·data-group-id="5851286435-69">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">versions</span><span·class="p"·data-group-id="5851286435-70">(</span><span·class="p"·data-group-id="5851286435-70">)</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·e27a17617de3d8c86f7fa4bc58597f935528718666cccf83396a3c405a7bc5f5·...·]-69">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">180 ·························</span><span·class="p"·data-group-id="5163698616-69">{</span><span·class="ss">versions</span><span·class="p">,</span><span·class="w">·················</span><span·class="nf">versions</span><span·class="p"·data-group-id="5163698616-70">(</span><span·class="p"·data-group-id="5163698616-70">)</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·3604a3b8e0196de9bad7cb6f4bdd720bdbc92148d26ef00416dad1860a0db3da·...·]-69">}</span><span·class="w">········</span><span·class="p">|</span><span·class="w">
181 ·························</span><span·class="p"·data-group-id="5851286435-71">{</span><span·class="ss">def_user_mod</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">def_user_module</span><span·class="p"·data-group-id="5851286435-72">(</span><span·class="p"·data-group-id="5851286435-72">)</span><span·class="w">··</span><span·class="p">|</span><span·class="w">181 ·························</span><span·class="p"·data-group-id="5163698616-71">{</span><span·class="ss">def_user_mod</span><span·class="p">,</span><span·class="w">·············</span><span·class="nf">def_user_module</span><span·class="p"·data-group-id="5163698616-72">(</span><span·class="p"·data-group-id="5163698616-72">)</span><span·class="w">··</span><span·class="p">|</span><span·class="w">
182 ·························</span><span·class="p"·data-group-id="5851286435-73">{</span><span·class="ss">def_user_data</span><span·class="p">,</span><span·class="w">············</span><span·class="nf">def_user_data</span><span·class="p"·data-group-id="5851286435-74">(</span><span·class="p"·data-group-id="5851286435-74">)[·...·truncated·by·diffoscope;·len:·48,·SHA:·b80285ff438385211ff27f4a74316ee69fed9c789b85f81081a26b47b99643fc·...·]-73">}</span></code></pre><p><a·href=""·id="agent_opts_and_types"></a></p><p>Agent·specific·config·options·and·types:</p><ul><li><p><strong><code·class="inline"·id="agent_type">agent_type()·=·master·|·sub·&lt;optional&gt;</code></strong>·-·If·<code·class="inline">master</code>,182 ·························</span><span·class="p"·data-group-id="5163698616-73">{</span><span·class="ss">def_user_data</span><span·class="p">,</span><span·class="w">············</span><span·class="nf">def_user_data</span><span·class="p"·data-group-id="5163698616-74">(</span><span·class="p"·data-group-id="5163698616-74">)[·...·truncated·by·diffoscope;·len:·48,·SHA:·9b3702d82e086c9567787d19ad89b682fe014443a628b9b89c5bba31ab01b8f3·...·]-73">}</span></code></pre><p><a·href=""·id="agent_opts_and_types"></a></p><p>Agent·specific·config·options·and·types:</p><ul><li><p><strong><code·class="inline"·id="agent_type">agent_type()·=·master·|·sub·&lt;optional&gt;</code></strong>·-·If·<code·class="inline">master</code>,
183 one·master·agent·is·started.·Otherwise,·no·agents·are·started.</p><p>Default·is·<code·class="inline">master</code>.</p></li><li><p><strong><code·class="inline"·id="agent_disco">agent_discovery()·=·[agent_discovery_opt()]·&lt;optional&gt;</code></strong>·-183 one·master·agent·is·started.·Otherwise,·no·agents·are·started.</p><p>Default·is·<code·class="inline">master</code>.</p></li><li><p><strong><code·class="inline"·id="agent_disco">agent_discovery()·=·[agent_discovery_opt()]·&lt;optional&gt;</code></strong>·-
184 <code·class="inline">agent_discovery_opt()·=·{terminating,·agent_terminating_discovery_opts()}·|·{originating,·agent_originating_discovery_opts()}</code></p><p>The·<code·class="inline">terminating</code>·options·effects·discovery·initiated·by·a·manager.</p><p>The·<code·class="inline">originating</code>·options·effects·discovery·initiated·by·this·agent.</p><p>For·defaults·see·the·options·in·<code·class="inline">agent_discovery_opt()</code>.</p></li><li><p><strong><code·class="inline"·id="agent_term_disco_opts">agent_terminating_discovery_opts()·=·[agent_terminating_discovery_opt()]·&lt;optional&gt;</code></strong>·-184 <code·class="inline">agent_discovery_opt()·=·{terminating,·agent_terminating_discovery_opts()}·|·{originating,·agent_originating_discovery_opts()}</code></p><p>The·<code·class="inline">terminating</code>·options·effects·discovery·initiated·by·a·manager.</p><p>The·<code·class="inline">originating</code>·options·effects·discovery·initiated·by·this·agent.</p><p>For·defaults·see·the·options·in·<code·class="inline">agent_discovery_opt()</code>.</p></li><li><p><strong><code·class="inline"·id="agent_term_disco_opts">agent_terminating_discovery_opts()·=·[agent_terminating_discovery_opt()]·&lt;optional&gt;</code></strong>·-
185 <code·class="inline">agent_terminating_discovery_opt()·=·{enable,·boolean()}·|·{stage2,·discovery·|·plain}·|·{trigger_username,·string()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">terminating</code>·in·this·agent·(i.e.185 <code·class="inline">agent_terminating_discovery_opt()·=·{enable,·boolean()}·|·{stage2,·discovery·|·plain}·|·{trigger_username,·string()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">terminating</code>·in·this·agent·(i.e.
186 initiated·by·a·manager).</p><p>The·default·values·for·the·<code·class="inline">terminating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li><li>stage2:·<code·class="inline">discovery</code></li><li>trigger_username:·<code·class="inline">&quot;&quot;</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_orig_disco_opts">agent_originating_discovery_opts()·=·[agent_originating_discovery_opt()]·&lt;optional&gt;</code></strong>·-186 initiated·by·a·manager).</p><p>The·default·values·for·the·<code·class="inline">terminating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li><li>stage2:·<code·class="inline">discovery</code></li><li>trigger_username:·<code·class="inline">&quot;&quot;</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_orig_disco_opts">agent_originating_discovery_opts()·=·[agent_originating_discovery_opt()]·&lt;optional&gt;</code></strong>·-
187 <code·class="inline">agent_originating_discovery_opt()·=·{enable,·boolean()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">originating</code>·in·this·agent.</p><p>The·default·values·for·the·<code·class="inline">originating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_mt">multi_threaded()·=·bool()·|·extended&lt;optional&gt;</code></strong>·-·If·<code·class="inline">true</code>187 <code·class="inline">agent_originating_discovery_opt()·=·{enable,·boolean()}</code></p><p>These·are·options·effecting·discovery·<code·class="inline">originating</code>·in·this·agent.</p><p>The·default·values·for·the·<code·class="inline">originating</code>·discovery·options·are:</p><ul><li>enable:·<code·class="inline">true</code></li></ul></li><li><p><strong><code·class="inline"·id="agent_mt">multi_threaded()·=·bool()·|·extended&lt;optional&gt;</code></strong>·-·If·<code·class="inline">true</code>
188 (or·<code·class="inline">extended</code>),·the·agent·is·multi-threaded,·with·one·thread·for·each·get188 (or·<code·class="inline">extended</code>),·the·agent·is·multi-threaded,·with·one·thread·for·each·get
189 request.</p><p>The·value·<code·class="inline">extended</code>·means·that·a·special·'process'·is·also·created·intended189 request.</p><p>The·value·<code·class="inline">extended</code>·means·that·a·special·'process'·is·also·created·intended
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646 ······<p·class="built-using">646 ······<p·class="built-using">
647 ········Built·using647 ········Built·using
648 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the648 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
649 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>649 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
650 ······</p>650 ······</p>
651 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>651 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
652 ····</footer>652 ····</footer>
653 ··</div>653 ··</div>
654 </main>654 </main>
655 </div>655 </div>
656 <script>656 <script>
657 ··function·mermaidLoaded()·{657 ··function·mermaidLoaded()·{
658 ····mermaid.initialize({658 ····mermaid.initialize({
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365 ········Built·using365 ········Built·using
366 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the366 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
367 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>367 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
368 ······</p>368 ······</p>
369 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>369 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
370 ····</footer>370 ····</footer>
371 ··</div>371 ··</div>
372 </main>372 </main>
373 </div>373 </div>
374 <script>374 <script>
375 ··function·mermaidLoaded()·{375 ··function·mermaidLoaded()·{
376 ····mermaid.initialize({376 ····mermaid.initialize({
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597 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>597 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
598 ······</p>598 ······</p>
599 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>599 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
600 ····</footer>600 ····</footer>
601 ··</div>601 ··</div>
602 </main>602 </main>
603 </div>603 </div>
604 <script>604 <script>
605 ··function·mermaidLoaded()·{605 ··function·mermaidLoaded()·{
606 ····mermaid.initialize({606 ····mermaid.initialize({
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158 Mnesia·table·<code·class="inline">snmp_variables</code>·which·must·be·a·table·with·two·attributes·(not·a158 Mnesia·table·<code·class="inline">snmp_variables</code>·which·must·be·a·table·with·two·attributes·(not·a
159 Mnesia·SNMP·table).·The·SNMP·tables·are·stored·in·Mnesia·tables·with·the·same159 Mnesia·SNMP·table).·The·SNMP·tables·are·stored·in·Mnesia·tables·with·the·same
160 names·as·the·SNMP·tables.·All·functions·assume·that·a·Mnesia·table·exists·with160 names·as·the·SNMP·tables.·All·functions·assume·that·a·Mnesia·table·exists·with
161 the·correct·name·and·attributes.·It·is·the·programmer's·responsibility·to·ensure161 the·correct·name·and·attributes.·It·is·the·programmer's·responsibility·to·ensure
162 this.·Specifically,·if·variables·are·stored·in·Mnesia,·the·table162 this.·Specifically,·if·variables·are·stored·in·Mnesia,·the·table
163 <code·class="inline">snmp_variables</code>·must·be·created·by·the·programmer.·The·record·definition·for163 <code·class="inline">snmp_variables</code>·must·be·created·by·the·programmer.·The·record·definition·for
164 this·table·is·defined·in·the·file·<code·class="inline">snmp/include/snmp_types.hrl</code>.</p><p>If·an·instrumentation·function·in·the·association·file·for·a·variable·<code·class="inline">myVar</code>164 this·table·is·defined·in·the·file·<code·class="inline">snmp/include/snmp_types.hrl</code>.</p><p>If·an·instrumentation·function·in·the·association·file·for·a·variable·<code·class="inline">myVar</code>
165 does·not·have·a·name·when·compiling·an·MIB,·the·compiler·generates·an·entry.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1650237061-1">{</span><span·class="ss">myVar</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1650237061-2">{</span><span·class="ss">snmp_generic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">var[·...·truncated·by·diffoscope;·len:·1108,·SHA:·6674d0804757d6fc56d6ea7e91cb6691d284cee353778f36ff81ca8b1d1cdb6c·...·]-4">}</span><span·class="p">}</span><span·class="p">.</span></code></pre><h2·id="module-example"·class="section-heading">165 does·not·have·a·name·when·compiling·an·MIB,·the·compiler·generates·an·entry.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6587233607-1">{</span><span·class="ss">myVar</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6587233607-2">{</span><span·class="ss">snmp_generic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">var[·...·truncated·by·diffoscope;·len:·1108,·SHA:·6b962983960890396d3e29712a9dae8f4cb37a9b5b96a93be6ac9812e54aa482·...·]-4">}</span><span·class="p">}</span><span·class="p">.</span></code></pre><h2·id="module-example"·class="section-heading">
166 ··<a·href="#module-example"·class="hover-link">166 ··<a·href="#module-example"·class="hover-link">
167 ····<i·class="ri-link-m"·aria-hidden="true"></i>167 ····<i·class="ri-link-m"·aria-hidden="true"></i>
168 ··</a>168 ··</a>
169 ··<span·class="text">Example</span>169 ··<span·class="text">Example</span>
170 </h2>170 </h2>
171 <p>The·following·example·shows·an·implementation·of·a·table·which·is·stored·in171 <p>The·following·example·shows·an·implementation·of·a·table·which·is·stored·in
172 Mnesia,·but·with·some·checks·performed·at·set-request·operations.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1802553758-1">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1802553758-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···</span><span·class="c1">%·pass·unchanged</span><span·class="w">172 Mnesia,·but·with·some·checks·performed·at·set-request·operations.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1930931332-1">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1930931332-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···</span><span·class="c1">%·pass·unchanged</span><span·class="w">
173 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1802553758-2">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1802553758-2">)</span><span·class="p">.</span><span·class="w">173 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1930931332-2">(</span><span·class="ss">new</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1930931332-2">)</span><span·class="p">.</span><span·class="w">
  
174 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1802553758-3">(</span><span·class="ss">delete</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1802553758-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···</span><span·class="c1">%·pass·unchanged</span><span·class="w">174 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1930931332-3">(</span><span·class="ss">delete</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1930931332-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···</span><span·class="c1">%·pass·unchanged</span><span·class="w">
175 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1802553758-4">(</span><span·class="ss">delete</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1802553758-4">)</span><span·class="p">.</span><span·class="w">175 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1930931332-4">(</span><span·class="ss">delete</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1930931332-4">)</span><span·class="p">.</span><span·class="w">
  
176 </span><span·class="c1">%%·change·row</span><span·class="w">176 </span><span·class="c1">%%·change·row</span><span·class="w">
177 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1802553758-5">(</span><span·class="ss">is_set_ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·70,·SHA:·4380e942db7a0d1fadf2d245b211abe98d61a7999faba25b1ff3193dd2f092f0·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">177 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1930931332-5">(</span><span·class="ss">is_set_ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·70,·SHA:·fbfc13b0364f28bb1dd9809dc9dbd5e9ccd9945a93c43209eca7de0dd69b7b70·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
178 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1802553758-6">(</span><span·class="ss">is_set_ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">178 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1930931332-6">(</span><span·class="ss">is_set_ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">
179 ·······························</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1802553758-6">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">179 ·······························</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1930931332-6">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
180 ····</span><span·class="p"·data-group-id="1802553758-7">{</span><span·class="ss">noError</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="1802553758-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 ····</span><span·class="p"·data-group-id="1930931332-7">{</span><span·class="ss">noError</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="1930931332-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ······</span><span·class="nc">myApplication</span><span·class="p">:</span><span·class="nf">is_set_ok</span><span·class="p"·data-group-id="1802553758-8">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="1802553758-8">)</span><span·class="p">;</span><span·class="w">181 ······</span><span·class="nc">myApplication</span><span·class="p">:</span><span·class="nf">is_set_ok</span><span·class="p"·data-group-id="1930931332-8">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="1930931332-8">)</span><span·class="p">;</span><span·class="w">
182 ····</span><span·class="n">Err</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 ····</span><span·class="n">Err</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ······</span><span·class="n">Err</span><span·class="w">183 ······</span><span·class="n">Err</span><span·class="w">
184 ··</span><span·class="k">end</span><span·class="p">;</span><span·class="w">184 ··</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
  
185 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1802553758-9">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·64,·SHA:·f788b1e134a7cd5f41c34710de798cf835e2929fc65896adc7e02af8731b2825·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">185 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1930931332-9">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·64,·SHA:·a572323c0e3b0429243588f32058a8069b91a8b9364220f74b7aa6b97d1b8528·...·]-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
186 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1802553758-10">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">186 ··</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1930931332-10">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">
187 ·······························</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1802553758-10">)</span><span·class="p">,</span><span·class="w">187 ·······························</span><span·class="n">NameDb</span><span·class="p"·data-group-id="1930931332-10">)</span><span·class="p">,</span><span·class="w">
188 ····</span><span·class="p"·data-group-id="1802553758-11">{</span><span·class="ss">noError</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="1802553758-11">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">188 ····</span><span·class="p"·data-group-id="1930931332-11">{</span><span·class="ss">noError</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p"·data-group-id="1930931332-11">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
189 ······</span><span·class="c1">%·Now·the·row·is·updated,·tell·the·application</span><span·class="w">189 ······</span><span·class="c1">%·Now·the·row·is·updated,·tell·the·application</span><span·class="w">
190 ······</span><span·class="nc">myApplication</span><span·class="p">:</span><span·class="nf">update</span><span·class="p"·data-group-id="1802553758-12">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="1802553758-12">)</span><span·class="p">;</span><span·class="w">190 ······</span><span·class="nc">myApplication</span><span·class="p">:</span><span·class="nf">update</span><span·class="p"·data-group-id="1930931332-12">(</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="1930931332-12">)</span><span·class="p">;</span><span·class="w">
191 ····</span><span·class="n">Err</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 ····</span><span·class="n">Err</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ······</span><span·class="n">Err</span><span·class="w">192 ······</span><span·class="n">Err</span><span·class="w">
193 ··</span><span·class="k">end</span><span·class="p">;</span><span·class="w">193 ··</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
  
194 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1802553758-13">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·63,·SHA:·c06d13a1b9a1640e2aa9ed1a2fac970d5fc333a9f93dee5beb3a746af1dd2c8a·...·]-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···</span><span·class="c1">%·pass·unchanged</span><span·class="w">194 </span><span·class="nf">myTable_func</span><span·class="p"·data-group-id="1930931332-13">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·63,·SHA:·bca3467c94c163da054d03b7944078b25bae9802f955c37ee8c9119f63e43cea·...·]-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">···</span><span·class="c1">%·pass·unchanged</span><span·class="w">
195 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1802553758-14">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·992,·SHA:·40ae0314e175e9bd6f21a137401b201851b2c6b35d8e725401884f208345d2a5·...·]-1">}</span><span·class="p">.</span></code></pre>195 ··</span><span·class="nc">snmp_generic</span><span·class="p">:</span><span·class="nf">table_func</span><span·class="p"·data-group-id="1930931332-14">(</span><span·class="n">Op</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·992,·SHA:·4ac2a4bda07ca5b392a18422119e9a7798af228fc396f196f91989d32b2d92d1·...·]-1">}</span><span·class="p">.</span></code></pre>
196 ····</section>196 ····</section>
  
197 </div>197 </div>
  
198 ··<section·id="summary"·class="details-list">198 ··<section·id="summary"·class="details-list">
199 ····<h1·class="section-heading">199 ····<h1·class="section-heading">
200 ······<a·class="hover-link"·href="#summary">200 ······<a·class="hover-link"·href="#summary">
Offset 929, 15 lines modifiedOffset 929, 15 lines modified
929 ······<p·class="built-using">929 ······<p·class="built-using">
930 ········Built·using930 ········Built·using
931 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the931 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
932 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>932 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
933 ······</p>933 ······</p>
934 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>934 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
935 ····</footer>935 ····</footer>
936 ··</div>936 ··</div>
937 </main>937 </main>
938 </div>938 </div>
939 <script>939 <script>
940 ··function·mermaidLoaded()·{940 ··function·mermaidLoaded()·{
941 ····mermaid.initialize({941 ····mermaid.initialize({
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226 ··</a>226 ··</a>
227 ··<span·class="text">Default·Implementation</span>227 ··<span·class="text">Default·Implementation</span>
228 </h2>228 </h2>
229 <p>Without·writing·any·instrumentation·functions,·we·can·compile·the·MIB·and·use229 <p>Without·writing·any·instrumentation·functions,·we·can·compile·the·MIB·and·use
230 the·default·implementation·of·it.·Recall·that·MIBs·imported·by·&quot;EX1-MIB.mib&quot;230 the·default·implementation·of·it.·Recall·that·MIBs·imported·by·&quot;EX1-MIB.mib&quot;
231 must·be·present·and·compiled·in·the·current·directory231 must·be·present·and·compiled·in·the·current·directory
232 (&quot;./STANDARD-MIB.bin&quot;,&quot;./RFC1213-MIB.bin&quot;)·when·compiling.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">unix</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">.</span><span·class="o">/</span><span·class="ss">sys</span><span·class="gp·unselectable">232 (&quot;./STANDARD-MIB.bin&quot;,&quot;./RFC1213-MIB.bin&quot;)·when·compiling.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">unix</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">config</span><span·class="w">·</span><span·class="p">.</span><span·class="o">/</span><span·class="ss">sys</span><span·class="gp·unselectable">
233 1&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5557571350-1">(</span><span·class="ss">snmp</span><span·class="p"·data-group-id="5557571350-1">)</span><span·class="p">.</span><span·class="w">233 1&gt;·</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2251021885-1">(</span><span·class="ss">snmp</span><span·class="p"·data-group-id="2251021885-1">)</span><span·class="p">.</span><span·class="w">
234 </span><span·class="ss">ok</span><span·class="gp·unselectable">234 </span><span·class="ss">ok</span><span·class="gp·unselectable">
235 2&gt;·</span><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="5557571350-2">(</span><span·class="s">&quot;EX1-MIB&quot;</span><span·class="p"·data-group-id="5557571350-2">)</span><span·class="p">.</span><span·class="w">235 2&gt;·</span><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="2251021885-2">(</span><span·class="s">&quot;EX1-MIB&quot;</span><span·class="p"·data-group-id="2251021885-2">)</span><span·class="p">.</span><span·class="w">
236 </span><span·class="n">No</span><span·class="w">·</span><span·class="ss">accessfunction</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">&#39;friendsTable&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">using</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">.</span><span·class="w">236 </span><span·class="n">No</span><span·class="w">·</span><span·class="ss">accessfunction</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">&#39;friendsTable&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">using</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">.</span><span·class="w">
237 </span><span·class="n">No</span><span·class="w">·</span><span·class="ss">accessfunction</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">&#39;myName&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">using</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">.</span><span·class="w">237 </span><span·class="n">No</span><span·class="w">·</span><span·class="ss">accessfunction</span><span·class="w">·</span><span·class="ss">for</span><span·class="w">·</span><span·class="ss">&#39;myName&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">using</span><span·class="w">·</span><span·class="ss">default</span><span·class="p">.</span><span·class="w">
238 </span><span·class="p"·data-group-id="5557571350-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;EX1-MIB.bin&quot;</span><span·class="p"·data-group-id="5557571350-3">}</span><span·class="gp·unselectable">238 </span><span·class="p"·data-group-id="2251021885-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;EX1-MIB.bin&quot;</span><span·class="p"·data-group-id="2251021885-3">}</span><span·class="gp·unselectable">
239 3&gt;·</span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">load_mibs</span><span·class="p"·data-group-id="5557571350-4">(</span><span·class="ss">snmp_master_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5557571350-5">[</span><span·class="s">&quot;EX1-MIB&quot;</span><span·class="p"·data-group-id="5557571350-5">]</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·9d784822eb5350622bc47c3af074d3aeb3acd45b1c17e6871842a89a29f23b85·...·]-4">)</span><span·class="p">.</span><span·class="w">239 3&gt;·</span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">load_mibs</span><span·class="p"·data-group-id="2251021885-4">(</span><span·class="ss">snmp_master_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2251021885-5">[</span><span·class="s">&quot;EX1-MIB&quot;</span><span·class="p"·data-group-id="2251021885-5">]</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·ba8e90ddd823f816a82598f7e81518c2316d38e972e9553f70769e753fc726aa·...·]-4">)</span><span·class="p">.</span><span·class="w">
240 </span><span·class="ss">ok</span></code></pre><p>This·MIB·is·now·loaded·into·the·agent,·and·a·manager·can·ask·questions.·As·an240 </span><span·class="ss">ok</span></code></pre><p>This·MIB·is·now·loaded·into·the·agent,·and·a·manager·can·ask·questions.·As·an
241 example·of·this,·we·start·another·Erlang·system·and·the·simple·Erlang·manager·in241 example·of·this,·we·start·another·Erlang·system·and·the·simple·Erlang·manager·in
242 the·toolkit:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="6343839701-1">(</span><span·class="p"·data-group-id="6343839701-2">[</span><span·class="p"·data-group-id="6343839701-3">{</span><span·class="ss">agent</span><span·class="p">,</span><span·class="s">&quot;dront.ericsson.se&quot;</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·250,·SHA:·f53fa6746dfb5cfa824f8ad3219c188fe19ccf938f7dce442d1e1675bb9afd18·...·]-4">}</span><span·class="p">,</span><span·class="w">242 the·toolkit:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="5111403097-1">(</span><span·class="p"·data-group-id="5111403097-2">[</span><span·class="p"·data-group-id="5111403097-3">{</span><span·class="ss">agent</span><span·class="p">,</span><span·class="s">&quot;dront.ericsson.se&quot;</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·250,·SHA:·d370b2effa1e2074252a58da27bd357f76540c55d8540d048498a54c3e060513·...·]-4">}</span><span·class="p">,</span><span·class="w">
243 ·</span><span·class="c1">%%·making·it·understand·symbolic·names:·{mibs,[&quot;EX1-MIB&quot;,&quot;STANDARD-MIB&quot;]}]).</span><span·class="w">243 ·</span><span·class="c1">%%·making·it·understand·symbolic·names:·{mibs,[&quot;EX1-MIB&quot;,&quot;STANDARD-MIB&quot;]}]).</span><span·class="w">
244 </span><span·class="p"·data-group-id="6343839701-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.89</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·e37ba4fa10c33c331bc14d169b9a59e4e4c90bf111e2b49e3abf0aaf5545e025·...·]-5">}</span><span·class="w">244 </span><span·class="p"·data-group-id="5111403097-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.89</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·9182bd4890633d4aa44be1095b7afbe392d0d007936e6e4f4bd894432616815c·...·]-5">}</span><span·class="w">
245 </span><span·class="c1">%%·a·get-next·request·with·one·OID.</span><span·class="gp·unselectable">245 </span><span·class="c1">%%·a·get-next·request·with·one·OID.</span><span·class="gp·unselectable">
246 2&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="6343839701-6">(</span><span·class="p"·data-group-id="6343839701-7">[</span><span·class="p"·data-group-id="6343839701-8">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">6</span><span[·...·truncated·by·diffoscope;·len:·289,·SHA:·9cc2209e54b053cfdc1ea0d02d019705627f036cd0a554840aef73929c801e9f·...·]-6">)</span><span·class="p">.</span><span·class="w">246 2&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="5111403097-6">(</span><span·class="p"·data-group-id="5111403097-7">[</span><span·class="p"·data-group-id="5111403097-8">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">6</span><span[·...·truncated·by·diffoscope;·len:·289,·SHA:·89ddcbc781db73ae561db91023cc0c675c4ab87aa3e2e3395e80e26c032d7069·...·]-6">)</span><span·class="p">.</span><span·class="w">
247 </span><span·class="ss">ok</span><span·class="w">247 </span><span·class="ss">ok</span><span·class="w">
248 </span><span·class="gt">*·Got·PDU:</span><span·class="w">248 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
249 </span><span·class="p"·data-group-id="6343839701-9">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-9">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·65,·SHA:·e18d93229d8ecaa752e96d1aa8d127aea233c285890ca502a218e8949d0514cd·...·]-10">]</span><span·class="w">249 </span><span·class="p"·data-group-id="5111403097-9">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-9">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·65,·SHA:·393c6a638fc1269b093f36c787dac617df58a4436732d9b987c0a381acfc76d6·...·]-10">]</span><span·class="w">
250 </span><span·class="c1">%%·A·set-request·(now·using·symbolic·names·for·convenience)</span><span·class="gp·unselectable">250 </span><span·class="c1">%%·A·set-request·(now·using·symbolic·names·for·convenience)</span><span·class="gp·unselectable">
251 3&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">s</span><span·class="p"·data-group-id="6343839701-11">(</span><span·class="p"·data-group-id="6343839701-12">[</span><span·class="p"·data-group-id="6343839701-13">{</span><span·class="p"·data-group-id="6343839701-14">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·300,·SHA:·083f8f9e6710a45d33c68150511609b3979d72def2ba357962855e85102fbdb7·...·]-11">)</span><span·class="p">.</span><span·class="w">251 3&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">s</span><span·class="p"·data-group-id="5111403097-11">(</span><span·class="p"·data-group-id="5111403097-12">[</span><span·class="p"·data-group-id="5111403097-13">{</span><span·class="p"·data-group-id="5111403097-14">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·300,·SHA:·2cf3eb57fafaba981e73577f820c00b6c78c32d386c85936011eca1bcccfbec1·...·]-11">)</span><span·class="p">.</span><span·class="w">
252 </span><span·class="ss">ok</span><span·class="w">252 </span><span·class="ss">ok</span><span·class="w">
253 </span><span·class="gt">*·Got·PDU:</span><span·class="w">253 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
254 </span><span·class="p"·data-group-id="6343839701-15">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-15">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="w">254 </span><span·class="p"·data-group-id="5111403097-15">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-15">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="w">
255 </span><span·class="c1">%%·Try·the·same·get-next·request·again</span><span·class="gp·unselectable">255 </span><span·class="c1">%%·Try·the·same·get-next·request·again</span><span·class="gp·unselectable">
256 4&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="6343839701-16">(</span><span·class="p"·data-group-id="6343839701-17">[</span><span·class="p"·data-group-id="6343839701-18">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">6</span><s[·...·truncated·by·diffoscope;·len:·294,·SHA:·aa8a49302fd4519dd5cfe6800e62745d59bf5efeec07ab78b276b2dd99bbf7fd·...·]-16">)</span><span·class="p">.</span><span·class="w">256 4&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="5111403097-16">(</span><span·class="p"·data-group-id="5111403097-17">[</span><span·class="p"·data-group-id="5111403097-18">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">6</span><s[·...·truncated·by·diffoscope;·len:·294,·SHA:·3faaba1d73f478720e1ec9a965bc991ebc781c06a717a06884016f8d1eabe0cb·...·]-16">)</span><span·class="p">.</span><span·class="w">
257 </span><span·class="ss">ok</span><span·class="w">257 </span><span·class="ss">ok</span><span·class="w">
258 </span><span·class="gt">*·Got·PDU:</span><span·class="w">258 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
259 </span><span·class="p"·data-group-id="6343839701-19">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-19">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="w">259 </span><span·class="p"·data-group-id="5111403097-19">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-19">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="w">
260 </span><span·class="c1">%%·...·and·we·got·the·new·value.</span><span·class="w">260 </span><span·class="c1">%%·...·and·we·got·the·new·value.</span><span·class="w">
261 </span><span·class="c1">%%·you·can·event·do·row·operations.·How·to·add·a·row:</span><span·class="gp·unselectable">261 </span><span·class="c1">%%·you·can·event·do·row·operations.·How·to·add·a·row:</span><span·class="gp·unselectable">
262 5&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">s</span><span·class="p"·data-group-id="6343839701-20">(</span><span·class="p"·data-group-id="6343839701-21">[</span><span·class="p"·data-group-id="6343839701-22">{</span><span·class="p"·data-group-id="6343839701-23">[</span><span·class="ss">fName</span><span·class="p">,</span><span·class="mi">0[·...·truncated·by·diffoscope;·len:·1100,·SHA:·2a192c5063244b3c3aa5ca9edbbb593198bcf4e797d4b2b2eab748d1f4831095·...·]-20">)</span><span·class="p">.</span><span·class="w">262 5&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">s</span><span·class="p"·data-group-id="5111403097-20">(</span><span·class="p"·data-group-id="5111403097-21">[</span><span·class="p"·data-group-id="5111403097-22">{</span><span·class="p"·data-group-id="5111403097-23">[</span><span·class="ss">fName</span><span·class="p">,</span><span·class="mi">0[·...·truncated·by·diffoscope;·len:·1100,·SHA:·b3c93d8de2859ff896075ef6bfe5638f46039b197cd02f1e4b5ce8975842fd01·...·]-20">)</span><span·class="p">.</span><span·class="w">
263 ·</span><span·class="c1">%%·createAndGo</span><span·class="w">263 ·</span><span·class="c1">%%·createAndGo</span><span·class="w">
264 </span><span·class="ss">ok</span><span·class="w">264 </span><span·class="ss">ok</span><span·class="w">
265 </span><span·class="gt">*·Got·PDU:</span><span·class="w">265 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
266 </span><span·class="p"·data-group-id="6343839701-28">[</span><span·class="ss">fName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-28">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="w">266 </span><span·class="p"·data-group-id="5111403097-28">[</span><span·class="ss">fName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-28">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="w">
267 </span><span·class="p"·data-group-id="6343839701-29">[</span><span·class="ss">fAddress</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-29">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;home&quot;</span><span·class="w">267 </span><span·class="p"·data-group-id="5111403097-29">[</span><span·class="ss">fAddress</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-29">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;home&quot;</span><span·class="w">
268 </span><span·class="p"·data-group-id="6343839701-30">[</span><span·class="ss">fStatus</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-30">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="gp·unselectable">268 </span><span·class="p"·data-group-id="5111403097-30">[</span><span·class="ss">fStatus</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-30">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="gp·unselectable">
269 6&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="6343839701-31">(</span><span·class="p"·data-group-id="6343839701-32">[</span><span·class="p"·data-group-id="6343839701-33">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-33">[·...·truncated·by·diffoscope;·len:·103,·SHA:·1da3659e65865fd93f43fffb11c71445d6ff63b9ac28e809915652592f4b5887·...·]-31">)</span><span·class="p">.</span><span·class="w">269 6&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="5111403097-31">(</span><span·class="p"·data-group-id="5111403097-32">[</span><span·class="p"·data-group-id="5111403097-33">[</span><span·class="ss">myName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-33">[·...·truncated·by·diffoscope;·len:·103,·SHA:·1d5052d40c7cc7795f2e63044d4e84110d0a16865d2a7411874fe0701cb10302·...·]-31">)</span><span·class="p">.</span><span·class="w">
270 </span><span·class="ss">ok</span><span·class="w">270 </span><span·class="ss">ok</span><span·class="w">
271 </span><span·class="gt">*·Got·PDU:</span><span·class="w">271 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
272 </span><span·class="p"·data-group-id="6343839701-34">[</span><span·class="ss">fName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-34">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="gp·unselectable">272 </span><span·class="p"·data-group-id="5111403097-34">[</span><span·class="ss">fName</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-34">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;Martin&quot;</span><span·class="gp·unselectable">
273 7&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="6343839701-35">(</span><span·class="p"·data-group-id="6343839701-35">)</span><span·class="p">.</span><span·class="w">273 7&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="5111403097-35">(</span><span·class="p"·data-group-id="5111403097-35">)</span><span·class="p">.</span><span·class="w">
274 </span><span·class="ss">ok</span><span·class="w">274 </span><span·class="ss">ok</span><span·class="w">
275 </span><span·class="gt">*·Got·PDU:</span><span·class="w">275 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
276 </span><span·class="p"·data-group-id="6343839701-36">[</span><span·class="ss">fAddress</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-36">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;home&quot;</span><span·class="gp·unselectable">276 </span><span·class="p"·data-group-id="5111403097-36">[</span><span·class="ss">fAddress</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-36">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;home&quot;</span><span·class="gp·unselectable">
277 8&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="6343839701-37">(</span><span·class="p"·data-group-id="6343839701-37">)</span><span·class="p">.</span><span·class="w">277 8&gt;·</span><span·class="nc">snmp_test_mgr</span><span·class="p">:</span><span·class="nf">gn</span><span·class="p"·data-group-id="5111403097-37">(</span><span·class="p"·data-group-id="5111403097-37">)</span><span·class="p">.</span><span·class="w">
278 </span><span·class="ss">ok</span><span·class="w">278 </span><span·class="ss">ok</span><span·class="w">
279 </span><span·class="gt">*·Got·PDU:</span><span·class="w">279 </span><span·class="gt">*·Got·PDU:</span><span·class="w">
280 </span><span·class="p"·data-group-id="6343839701-38">[</span><span·class="ss">fStatus</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="6343839701-38">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">280 </span><span·class="p"·data-group-id="5111403097-38">[</span><span·class="ss">fStatus</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5111403097-38">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">
281 </span><span·class="mi">9</span><span·class="o">&gt;</span></code></pre><h2·id="manual-implementation"·class="section-heading">281 </span><span·class="mi">9</span><span·class="o">&gt;</span></code></pre><h2·id="manual-implementation"·class="section-heading">
282 ··<a·href="#manual-implementation"·class="hover-link">282 ··<a·href="#manual-implementation"·class="hover-link">
283 ····<i·class="ri-link-m"·aria-hidden="true"></i>283 ····<i·class="ri-link-m"·aria-hidden="true"></i>
284 ··</a>284 ··</a>
285 ··<span·class="text">Manual·Implementation</span>285 ··<span·class="text">Manual·Implementation</span>
286 </h2>286 </h2>
287 <p>The·following·example·shows·a·&quot;manual&quot;·implementation·of·the·EX1-MIB·in·Erlang.287 <p>The·following·example·shows·a·&quot;manual&quot;·implementation·of·the·EX1-MIB·in·Erlang.
Offset 291, 247 lines modifiedOffset 291, 247 lines modified
291 <code·class="inline">friendsTable</code>.·Each·row·is·a·4-tuple.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>There·are·more·efficient·ways·to·create·tables·manually,·i.e.·to·use·the291 <code·class="inline">friendsTable</code>.·Each·row·is·a·4-tuple.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>There·are·more·efficient·ways·to·create·tables·manually,·i.e.·to·use·the
292 module·<code·class="inline">snmp_index</code>.</p></section><h3·id="code"·class="section-heading">292 module·<code·class="inline">snmp_index</code>.</p></section><h3·id="code"·class="section-heading">
293 ··<a·href="#code"·class="hover-link">293 ··<a·href="#code"·class="hover-link">
294 ····<i·class="ri-link-m"·aria-hidden="true"></i>294 ····<i·class="ri-link-m"·aria-hidden="true"></i>
295 ··</a>295 ··</a>
296 ··<span·class="text">Code</span>296 ··<span·class="text">Code</span>
297 </h3>297 </h3>
298 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4972383225-1">(</span><span·class="ss">ex1</span><span·class="p"·data-group-id="4972383225-1">)</span><span·class="p">.</span><span·class="w">298 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2173272689-1">(</span><span·class="ss">ex1</span><span·class="p"·data-group-id="2173272689-1">)</span><span·class="p">.</span><span·class="w">
299 </span><span·class="p">-</span><span·class="na">author</span><span·class="p"·data-group-id="4972383225-2">(</span><span·class="ss">&#39;dummy@flop.org&#39;</span><span·class="p"·data-group-id="4972383225-2">)</span><span·class="p">.</span><span·class="w">299 </span><span·class="p">-</span><span·class="na">author</span><span·class="p"·data-group-id="2173272689-2">(</span><span·class="ss">&#39;dummy@flop.org&#39;</span><span·class="p"·data-group-id="2173272689-2">)</span><span·class="p">.</span><span·class="w">
300 </span><span·class="c1">%%·External·exports</span><span·class="w">300 </span><span·class="c1">%%·External·exports</span><span·class="w">
301 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4972383225-3">(</span><span·class="p"·data-group-id="4972383225-4">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_name</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·381,·SHA:·0c04326b4c108d6ef662b9c3745c076ad3bed70c650f5444fbc93664b2cc0fe4·...·]-3">)</span><span·class="p">.</span><span·class="w">301 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2173272689-3">(</span><span·class="p"·data-group-id="2173272689-4">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_name</span><span·class="p">/</span>[·...·truncated·by·diffoscope;·len:·381,·SHA:·efacdf9e3b954fcabcb9a799a50cbf6ef88a602a3b18aaafc8f9941967eebf63·...·]-3">)</span><span·class="p">.</span><span·class="w">
302 </span><span·class="c1">%%·Internal·exports</span><span·class="w">302 </span><span·class="c1">%%·Internal·exports</span><span·class="w">
303 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4972383225-5">(</span><span·class="p"·data-group-id="4972383225-6">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4972383225-6">]</span><span·class="p"·data-group-id="4972383225-5">)</span><span·class="p">.</span><span·class="w">303 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2173272689-5">(</span><span·class="p"·data-group-id="2173272689-6">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2173272689-6">]</span><span·class="p"·data-group-id="2173272689-5">)</span><span·class="p">.</span><span·class="w">
304 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-7">(</span><span·class="ss">status_col</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="4972383225-7">)</span><span·class="p">.</span><span·class="w">304 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-7">(</span><span·class="ss">status_col</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="2173272689-7">)</span><span·class="p">.</span><span·class="w">
305 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-8">(</span><span·class="ss">active</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="4972383225-8">)</span><span·class="p">.</span><span·class="w">305 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-8">(</span><span·class="ss">active</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="2173272689-8">)</span><span·class="p">.</span><span·class="w">
306 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-9">(</span><span·class="ss">notInService</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="4972383225-9">)</span><span·class="p">.</span><span·class="w">306 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-9">(</span><span·class="ss">notInService</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="2173272689-9">)</span><span·class="p">.</span><span·class="w">
307 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-10">(</span><span·class="ss">notReady</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="4972383225-10">)</span><span·class="p">.</span><span·class="w">307 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-10">(</span><span·class="ss">notReady</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="2173272689-10">)</span><span·class="p">.</span><span·class="w">
308 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-11">(</span><span·class="ss">createAndGo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="4972383225-11">)</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·Action;·written,·not·read</span><span·class="w">308 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-11">(</span><span·class="ss">createAndGo</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="2173272689-11">)</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·Action;·written,·not·read</span><span·class="w">
309 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-12">(</span><span·class="ss">createAndWait</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="4972383225-12">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Action;·written,·not·read</span><span·class="w">309 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-12">(</span><span·class="ss">createAndWait</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">5</span><span·class="p"·data-group-id="2173272689-12">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Action;·written,·not·read</span><span·class="w">
310 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4972383225-13">(</span><span·class="ss">destroy</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">6</span><span·class="p"·data-group-id="4972383225-13">)</span><span·class="p">.</span><span·class="w">·······</span><span·class="c1">%·Action;·written,·not·read</span><span·class="w">310 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="2173272689-13">(</span><span·class="ss">destroy</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">6</span><span·class="p"·data-group-id="2173272689-13">)</span><span·class="p">.</span><span·class="w">·······</span><span·class="c1">%·Action;·written,·not·read</span><span·class="w">
311 </span><span·class="nf">start</span><span·class="p"·data-group-id="4972383225-14">(</span><span·class="p"·data-group-id="4972383225-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">311 </span><span·class="nf">start</span><span·class="p"·data-group-id="2173272689-14">(</span><span·class="p"·data-group-id="2173272689-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
312 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4972383225-15">(</span><span·class="ss">ex1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4972383225-16">[</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·67,·SHA:·a533bd3e384e33b58fa6106e0060aa4d3c75ab1b97890e1e92873106f64e0a5c·...·]-15">)</span><span·class="p">.</span><span·class="w">312 ····</span><span·class="nf">spawn</span><span·class="p"·data-group-id="2173272689-15">(</span><span·class="ss">ex1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2173272689-16">[</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·67,·SHA:·b9c83aa3d546df1006c858ccb8861d2904d8d5514b20c5add84c1d1cad0ba505·...·]-15">)</span><span·class="p">.</span><span·class="w">
313 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">313 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">
314 </span><span·class="c1">%%·Instrumentation·function·for·variable·myName.</span><span·class="w">314 </span><span·class="c1">%%·Instrumentation·function·for·variable·myName.</span><span·class="w">
315 </span><span·class="c1">%%·Returns:·(get)·{value,·Name}</span><span·class="w">315 </span><span·class="c1">%%·Returns:·(get)·{value,·Name}</span><span·class="w">
316 </span><span·class="c1">%%··········(set)·noError</span><span·class="w">316 </span><span·class="c1">%%··········(set)·noError</span><span·class="w">
317 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">317 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">
318 </span><span·class="nf">my_name</span><span·class="p"·data-group-id="4972383225-17">(</span><span·class="nb">get</span><span·class="p"·data-group-id="4972383225-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">318 </span><span·class="nf">my_name</span><span·class="p"·data-group-id="2173272689-17">(</span><span·class="nb">get</span><span·class="p"·data-group-id="2173272689-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
319 ····</span><span·class="ss">ex1_server</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4972383225-18">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4972383225-19">(</span><span·class="p"·data-group-id="4972383225-19">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">get_my_name</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·c1bd8ea8c8df291eb8bb2e40246a8137e67aaed4b7db388a073b5b9bd1c1223e·...·]-18">}</span><span·class="p">,</span><span·class="w">319 ····</span><span·class="ss">ex1_server</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2173272689-18">{</span><span·class="nf">self</span><span·class="p"·data-group-id="2173272689-19">(</span><span·class="p"·data-group-id="2173272689-19">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">get_my_name</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·8e330f41de5d36d0c2fbc3bcf977b5f63a1b28b3e53761e5efec75982d8bcdaf·...·]-18">}</span><span·class="p">,</span><span·class="w">
320 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">wait_answer</span><span·class="p"·data-group-id="4972383225-20">(</span><span·class="p"·data-group-id="4972383225-20">)</span><span·class="p">,</span><span·class="w">320 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">wait_answer</span><span·class="p"·data-group-id="2173272689-20">(</span><span·class="p"·data-group-id="2173272689-20">)</span><span·class="p">,</span><span·class="w">
321 ····</span><span·class="p"·data-group-id="4972383225-21">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="4972383225-21">}</span><span·class="p">.</span><span·class="w">321 ····</span><span·class="p"·data-group-id="2173272689-21">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p"·data-group-id="2173272689-21">}</span><span·class="p">.</span><span·class="w">
322 </span><span·class="nf">my_name</span><span·class="p"·data-group-id="4972383225-22">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewName</span><span·class="p"·data-group-id="4972383225-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">322 </span><span·class="nf">my_name</span><span·class="p"·data-group-id="2173272689-22">(</span><span·class="ss">set</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewName</span><span·class="p"·data-group-id="2173272689-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
323 ····</span><span·class="ss">ex1_server</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="4972383225-23">{</span><span·class="nf">self</span><span·class="p"·data-group-id="4972383225-24">(</span><span·class="p"·data-group-id="4972383225-24">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4972383225-25">{</[·...·truncated·by·diffoscope;·len:·213,·SHA:·f1cf53d52604b65efebb30ab38fbc99472675edeec598092d7de8b39273ac207·...·]-23">}</span><span·class="p">,</span><span·class="w">323 ····</span><span·class="ss">ex1_server</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="2173272689-23">{</span><span·class="nf">self</span><span·class="p"·data-group-id="2173272689-24">(</span><span·class="p"·data-group-id="2173272689-24">)</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2173272689-25">{</[·...·truncated·by·diffoscope;·len:·213,·SHA:·52568896e01e3efd3ed67751a07e0ac5a198e15c373653e625cbc62ae510588c·...·]-23">}</span><span·class="p">,</span><span·class="w">
324 ····</span><span·class="ss">noError</span><span·class="p">.</span><span·class="w">324 ····</span><span·class="ss">noError</span><span·class="p">.</span><span·class="w">
325 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">325 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">
326 </span><span·class="c1">%%·Instrumentation·function·for·table·friendsTable.</span><span·class="w">326 </span><span·class="c1">%%·Instrumentation·function·for·table·friendsTable.</span><span·class="w">
327 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">327 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">
328 </span><span·class="nf">friends_table</span><span·class="p"·data-group-id="4972383225-26">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="4972383225-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">328 </span><span·class="nf">friends_table</span><span·class="p"·data-group-id="2173272689-26">(</span><span·class="nb">get</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="2173272689-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
329 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_row</span><span·class="p"·data-group-id="4972383225-27">(</span><span·class="n">RowIndex</span><span·class="p"·data-group-id="4972383225-27">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">329 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_row</span><span·class="p"·data-group-id="2173272689-27">(</span><span·class="n">RowIndex</span><span·class="p"·data-group-id="2173272689-27">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
330 ···</span><span·class="p"·data-group-id="4972383225-28">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="4972383225-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">330 ···</span><span·class="p"·data-group-id="2173272689-28">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="2173272689-28">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
331 ········</span><span·class="nf">get_cols</span><span·class="p"·data-group-id="4972383225-29">(</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="4972383225-29">)</span><span·class="p">;</span><span·class="w">331 ········</span><span·class="nf">get_cols</span><span·class="p"·data-group-id="2173272689-29">(</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="2173272689-29">)</span><span·class="p">;</span><span·class="w">
332 ···</span><span·class="p">_</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">332 ···</span><span·class="p">_</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">
333 ········</span><span·class="p"·data-group-id="4972383225-30">{</span><span·class="ss">noValue</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">noSuchInstance</span><span·class="p"·data-group-id="4972383225-30">}</span><span·class="w">333 ········</span><span·class="p"·data-group-id="2173272689-30">{</span><span·class="ss">noValue</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">noSuchInstance</span><span·class="p"·data-group-id="2173272689-30">}</span><span·class="w">
334 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">334 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
335 </span><span·class="nf">friends_table</span><span·class="p"·data-group-id="4972383225-31">(</span><span·class="ss">get_next</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="4972383225-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">335 </span><span·class="nf">friends_table</span><span·class="p"·data-group-id="2173272689-31">(</span><span·class="ss">get_next</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RowIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cols</span><span·class="p"·data-group-id="2173272689-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
336 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_next_row</span><span·class="p"·data-group-id="4972383225-32">(</span><span·class="n">RowIndex</span><span·class="p"·data-group-id="4972383225-32">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">336 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_next_row</span><span·class="p"·data-group-id="2173272689-32">(</span><span·class="n">RowIndex</span><span·class="p"·data-group-id="2173272689-32">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
337 ···</span><span·class="p"·data-group-id="4972383225-33">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="4972383225-33">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">337 ···</span><span·class="p"·data-group-id="2173272689-33">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="2173272689-33">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
338 ········</span><span·class="nf">get_next_cols</span><span·class="p"·data-group-id="4972383225-34">(</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="4972383225-34">)</span><span·class="p">;</span><span·class="w">338 ········</span><span·class="nf">get_next_cols</span><span·class="p"·data-group-id="2173272689-34">(</span><span·class="n">Cols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="2173272689-34">)</span><span·class="p">;</span><span·class="w">
339 ···</span><span·class="p">_</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">339 ···</span><span·class="p">_</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">
340 ·······</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_next_row</span><span·class="p"·data-group-id="4972383225-35">(</span><span·class="p"·data-group-id="4972383225-36">[</span><span·class="p"·data-group-id="4972383225-36">]</span><span·class="p"·data-group-id="4972383225-35">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">340 ·······</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">get_next_row</span><span·class="p"·data-group-id="2173272689-35">(</span><span·class="p"·data-group-id="2173272689-36">[</span><span·class="p"·data-group-id="2173272689-36">]</span><span·class="p"·data-group-id="2173272689-35">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
341 ·····</span><span·class="p"·data-group-id="4972383225-37">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="4972383225-37">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">341 ·····</span><span·class="p"·data-group-id="2173272689-37">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="2173272689-37">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
342 ·········</span><span·class="c1">%·Get·next·cols·from·first·row.</span><span·class="w">342 ·········</span><span·class="c1">%·Get·next·cols·from·first·row.</span><span·class="w">
343 ·········</span><span·class="n">NewCols</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">add_one_to_cols</span><span·class="p"·data-group-id="4972383225-38">(</span><span·class="n">Cols</span><span·class="p"·data-group-id="4972383225-38">)</span><span·class="p">,</span><span·class="w">343 ·········</span><span·class="n">NewCols</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">add_one_to_cols</span><span·class="p"·data-group-id="2173272689-38">(</span><span·class="n">Cols</span><span·class="p"·data-group-id="2173272689-38">)</span><span·class="p">,</span><span·class="w">
344 ·········</span><span·class="nf">get_next_cols</span><span·class="p"·data-group-id="4972383225-39">(</span><span·class="n">NewCols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="4972383225-39">)</span><span·class="p">;</span><span·class="w">344 ·········</span><span·class="nf">get_next_cols</span><span·class="p"·data-group-id="2173272689-39">(</span><span·class="n">NewCols</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Row</span><span·class="p"·data-group-id="2173272689-39">)</span><span·class="p">;</span><span·class="w">
345 ·····</span><span·class="p">_</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">345 ·····</span><span·class="p">_</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">
346 ········</span><span·class="nf">end_of_table</span><span·class="p"·data-group-id="4972383225-40">(</span><span·class="n">Cols</span><span·class="p"·data-group-id="4972383225-40">)</span><span·class="w">346 ········</span><span·class="nf">end_of_table</span><span·class="p"·data-group-id="2173272689-40">(</span><span·class="n">Cols</span><span·class="p"·data-group-id="2173272689-40">)</span><span·class="w">
347 ········</span><span·class="k">end</span><span·class="w">347 ········</span><span·class="k">end</span><span·class="w">
348 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">348 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
349 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">349 </span><span·class="c1">%%----------------------------------------------------------------</span><span·class="w">
350 </span><span·class="c1">%%·If·RowStatus·is·set,·then:</span><span·class="w">350 </span><span·class="c1">%%·If·RowStatus·is·set,·then:</span><span·class="w">
351 </span><span·class="c1">%%····*)·If·set·to·destroy,·check·that·row·does·exist</span><span·class="w">351 </span><span·class="c1">%%····*)·If·set·to·destroy,·check·that·row·does·exist</span><span·class="w">
352 </span><span·class="c1">%%····*)·If·set·to·createAndGo,·check·that·row·does·not·exist·AND</span><span·class="w">352 </span><span·class="c1">%%····*)·If·set·to·createAndGo,·check·that·row·does·not·exist·AND</span><span·class="w">
353 </span><span·class="c1">%%·········that·all·columns·are·given·values.</span><span·class="w">353 </span><span·class="c1">%%·········that·all·columns·are·given·values.</span><span·class="w">
354 </span><span·class="c1">%%····*)·Otherwise,·error·(for·simplicity).</span><span·class="w">354 </span><span·class="c1">%%····*)·Otherwise,·error·(for·simplicity).</span><span·class="w">
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189 ······<p·class="built-using">189 ······<p·class="built-using">
190 ········Built·using190 ········Built·using
191 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the191 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
192 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>192 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
193 ······</p>193 ······</p>
194 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>194 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
195 ····</footer>195 ····</footer>
196 ··</div>196 ··</div>
197 </main>197 </main>
198 </div>198 </div>
199 <script>199 <script>
200 ··function·mermaidLoaded()·{200 ··function·mermaidLoaded()·{
201 ····mermaid.initialize({201 ····mermaid.initialize({
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131 <p>Abstract·Data·Type·for·SNMP·Indexing</p><p>The·module·<code·class="inline">snmp_index</code>·implements·an·Abstract·Data·Type·(ADT)·for·an·SNMP·index131 <p>Abstract·Data·Type·for·SNMP·Indexing</p><p>The·module·<code·class="inline">snmp_index</code>·implements·an·Abstract·Data·Type·(ADT)·for·an·SNMP·index
132 structure·for·SNMP·tables.·It·is·implemented·as·an·ets·table·of·the·ordered_set132 structure·for·SNMP·tables.·It·is·implemented·as·an·ets·table·of·the·ordered_set
133 data-type,·which·means·that·all·operations·are·O(log·n).·In·the·table,·the·key133 data-type,·which·means·that·all·operations·are·O(log·n).·In·the·table,·the·key
134 is·an·ASN.1·OBJECT·IDENTIFIER.</p><p>This·index·is·used·to·separate·the·implementation·of·the·SNMP·ordering·from·the134 is·an·ASN.1·OBJECT·IDENTIFIER.</p><p>This·index·is·used·to·separate·the·implementation·of·the·SNMP·ordering·from·the
135 actual·implementation·of·the·table.·The·SNMP·ordering,·that·is·implementation·of135 actual·implementation·of·the·table.·The·SNMP·ordering,·that·is·implementation·of
136 GET·NEXT,·is·implemented·in·this·module.</p><p>For·example,·suppose·there·is·an·SNMP·table,·which·is·best·implemented·in·Erlang136 GET·NEXT,·is·implemented·in·this·module.</p><p>For·example,·suppose·there·is·an·SNMP·table,·which·is·best·implemented·in·Erlang
137 as·one·process·per·SNMP·table·row.·Suppose·further·that·the·INDEX·in·the·SNMP137 as·one·process·per·SNMP·table·row.·Suppose·further·that·the·INDEX·in·the·SNMP
138 table·is·an·OCTET·STRING.·The·index·structure·would·be·created·as·follows:</p><pre><code·class="text">snmp_index:new(string)</code></pre><p>For·each·new·process·we·create,·we·insert·an·item·in·an·<code·class="inline">snmp_index</code>·structure:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">new_process</span><span·class="p"·data-group-id="0769574662-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SnmpIndex</span><span·class="p"·data-group-id="0769574662-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 table·is·an·OCTET·STRING.·The·index·structure·would·be·created·as·follows:</p><pre><code·class="text">snmp_index:new(string)</code></pre><p>For·each·new·process·we·create,·we·insert·an·item·in·an·<code·class="inline">snmp_index</code>·structure:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">new_process</span><span·class="p"·data-group-id="9329107811-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SnmpIndex</span><span·class="p"·data-group-id="9329107811-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ··</span><span·class="n">Pid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_process</span><span·class="p"·data-group-id="0769574662-2">(</span><span·class="p"·data-group-id="0769574662-2">)</span><span·class="p">,</span><span·class="w">139 ··</span><span·class="n">Pid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_process</span><span·class="p"·data-group-id="9329107811-2">(</span><span·class="p"·data-group-id="9329107811-2">)</span><span·class="p">,</span><span·class="w">
140 ··</span><span·class="n">NewSnmpIndex</span><span·class="w">·</span><span·class="o">=</span><span·class="w">140 ··</span><span·class="n">NewSnmpIndex</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
141 ····</span><span·class="nc">snmp_index</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="0769574662-3">(</span><span·class="n">SnmpIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="0769574662-3">)</span><span·class="p">,</span><span·class="w">141 ····</span><span·class="nc">snmp_index</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="9329107811-3">(</span><span·class="n">SnmpIndex</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="9329107811-3">)</span><span·class="p">,</span><span·class="w">
142 ··</span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="o">&gt;</span></code></pre><p>With·this·structure,·we·can·now·map·an·OBJECT·IDENTIFIER·in·e.g.·a·GET·NEXT142 ··</span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="o">&gt;</span></code></pre><p>With·this·structure,·we·can·now·map·an·OBJECT·IDENTIFIER·in·e.g.·a·GET·NEXT
143 request,·to·the·correct·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">get_next_pid</span><span·class="p"·data-group-id="4121225683-1">(</span><span·class="n">Oid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SnmpIndex</span><span·class="p"·data-group-id="4121225683-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">143 request,·to·the·correct·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">get_next_pid</span><span·class="p"·data-group-id="1230947625-1">(</span><span·class="n">Oid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SnmpIndex</span><span·class="p"·data-group-id="1230947625-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
144 ··</span><span·class="p"·data-group-id="4121225683-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4121225683-3">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·cla[·...·truncated·by·diffoscope;·len:·459,·SHA:·8a96ea782c6e3e1e9c1e6498e63e900c1aa5a0163e1a4a62a334774d4c5a5e05·...·]-4">)</span><span·class="p">,</span><span·class="w">144 ··</span><span·class="p"·data-group-id="1230947625-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1230947625-3">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·cla[·...·truncated·by·diffoscope;·len:·459,·SHA:·8cbff84f5108c47253069a171b2381936640de6571e7e71f84df1e95aa873c57·...·]-4">)</span><span·class="p">,</span><span·class="w">
145 ··</span><span·class="n">Pid</span><span·class="p">.</span></code></pre><h2·id="module-warnings"·class="section-heading">145 ··</span><span·class="n">Pid</span><span·class="p">.</span></code></pre><h2·id="module-warnings"·class="section-heading">
146 ··<a·href="#module-warnings"·class="hover-link">146 ··<a·href="#module-warnings"·class="hover-link">
147 ····<i·class="ri-link-m"·aria-hidden="true"></i>147 ····<i·class="ri-link-m"·aria-hidden="true"></i>
148 ··</a>148 ··</a>
149 ··<span·class="text">Warnings</span>149 ··<span·class="text">Warnings</span>
150 </h2>150 </h2>
151 <section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p><a·href=""·id="1"></a>·All·API·functions·that·update·the·index·return·a·<code·class="inline">NewIndex</code>·term.151 <section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p><a·href=""·id="1"></a>·All·API·functions·that·update·the·index·return·a·<code·class="inline">NewIndex</code>·term.
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764 ········Built·using764 ········Built·using
765 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the765 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
766 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>766 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
767 ······</p>767 ······</p>
768 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>768 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
769 ····</footer>769 ····</footer>
770 ··</div>770 ··</div>
771 </main>771 </main>
772 </div>772 </div>
773 <script>773 <script>
774 ··function·mermaidLoaded()·{774 ··function·mermaidLoaded()·{
775 ····mermaid.initialize({775 ····mermaid.initialize({
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210 accessible),·and·the·table·has·three·rows.·The·instrumentation·function·for·this210 accessible),·and·the·table·has·three·rows.·The·instrumentation·function·for·this
211 table·is·called·<code·class="inline">my_table</code>.</p><p><a·href=""·id="getnext1"></a></p><p><img·src="assets/getnext1.gif"·alt="Contents·of·my_table"·title="Contents·of·my_table"/></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>N/A·means·not·accessible.</p></section><p>The·manager·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry.3.1.1,211 table·is·called·<code·class="inline">my_table</code>.</p><p><a·href=""·id="getnext1"></a></p><p><img·src="assets/getnext1.gif"·alt="Contents·of·my_table"·title="Contents·of·my_table"/></p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>N/A·means·not·accessible.</p></section><p>The·manager·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry.3.1.1,
212 ·········myTable.myTableEntry.5.1.1·}</code></pre><p>Since·both·operations·involve·the·1.1·index,·this·is·transformed·into·one·call212 ·········myTable.myTableEntry.5.1.1·}</code></pre><p>Since·both·operations·involve·the·1.1·index,·this·is·transformed·into·one·call
213 to·<code·class="inline">my_table</code>:</p><pre><code·class="text">my_table(get_next,·[1,·1],·[3,·5])</code></pre><p>In·this·call,·<code·class="inline">[1,·1]</code>·is·the·<code·class="inline">RowIndex</code>,·where·key·1·has·value·1,·and·key·2·has213 to·<code·class="inline">my_table</code>:</p><pre><code·class="text">my_table(get_next,·[1,·1],·[3,·5])</code></pre><p>In·this·call,·<code·class="inline">[1,·1]</code>·is·the·<code·class="inline">RowIndex</code>,·where·key·1·has·value·1,·and·key·2·has
214 value·1,·and·<code·class="inline">[3,·5]</code>·is·the·list·of·requested·columns.·The·function·should·now214 value·1,·and·<code·class="inline">[3,·5]</code>·is·the·list·of·requested·columns.·The·function·should·now
215 return·the·lexicographically·next·elements:</p><pre><code·class="text">[{[3,·1,·2],·d},·{[5,·1,·2],·f}]</code></pre><p>This·is·illustrated·in·the·following·table:</p><p><a·href=""·id="getnext2"></a></p><p><img·src="assets/getnext2.gif"·alt="GetNext·from·[3,1,1]·and·[5,1,1]."·title="GetNext·from·[3,1,1]·and·[5,1,1]."/></p><p>The·manager·now·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry.3.2.1,215 return·the·lexicographically·next·elements:</p><pre><code·class="text">[{[3,·1,·2],·d},·{[5,·1,·2],·f}]</code></pre><p>This·is·illustrated·in·the·following·table:</p><p><a·href=""·id="getnext2"></a></p><p><img·src="assets/getnext2.gif"·alt="GetNext·from·[3,1,1]·and·[5,1,1]."·title="GetNext·from·[3,1,1]·and·[5,1,1]."/></p><p>The·manager·now·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry.3.2.1,
216 ·········myTable.myTableEntry.5.2.1·}</code></pre><p>This·is·transformed·into·one·call·to·<code·class="inline">my_table</code>:</p><pre><code·class="text">my_table(get_next,·[2,·1],·[3,·5])</code></pre><p>The·function·should·now·return:</p><pre><code·class="text">[{[4,·1,·1],·b},·endOfTable]</code></pre><p>This·is·illustrated·in·the·following·table:</p><p><a·href=""·id="getnext3"></a></p><p><img·src="assets/getnext3.gif"·alt="GetNext·from·[3,2,1]·and·[5,2,1]."·title="GetNext·from·[3,2,1]·and·[5,2,1]."/></p><p>The·manager·now·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry.3.1.2,216 ·········myTable.myTableEntry.5.2.1·}</code></pre><p>This·is·transformed·into·one·call·to·<code·class="inline">my_table</code>:</p><pre><code·class="text">my_table(get_next,·[2,·1],·[3,·5])</code></pre><p>The·function·should·now·return:</p><pre><code·class="text">[{[4,·1,·1],·b},·endOfTable]</code></pre><p>This·is·illustrated·in·the·following·table:</p><p><a·href=""·id="getnext3"></a></p><p><img·src="assets/getnext3.gif"·alt="GetNext·from·[3,2,1]·and·[5,2,1]."·title="GetNext·from·[3,2,1]·and·[5,2,1]."/></p><p>The·manager·now·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry.3.1.2,
217 ·········myTable.myTableEntry.4.1.2·}</code></pre><p>This·will·be·transform·into·one·call·to·<code·class="inline">my_table</code>:</p><pre><code·class="text">my_table(get_next,·[1,·2],·[3,·4])</code></pre><p>The·function·should·now·return:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5856100716-1">[</span><span·class="p"·data-group-id="5856100716-2">{</span><span·class="p"·data-group-id="5856100716-3">[</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5856100716-3">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">g</span><span·class="p"·data-group-id="5856100716-2">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5856100716-4">{</span><span·class="p"·data-group-id="5856100716-5">[</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="5856100716-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p"·data-group-id="5856100716-4">}</span><span·class="p"·data-group-id="5856100716-1">]</span></code></pre><p>This·is·illustrated·in·the·following·table:</p><p><a·href=""·id="getnext4"></a></p><p><img·src="assets/getnext4.gif"·alt="GetNext·from·[3,1,2]·and·[4,1,2]."·title="GetNext·from·[3,1,2]·and·[4,1,2]."/></p><p>The·manager·now·issues·the·following·<code·class="inline">getNext</code>·request:</p><pre><code·class="text">getNext{·myTable.myTableEntry, 
218 ·········myTable.myTableEntry.1.3.2·}</code></pre><p>This·will·be·transform·into·two·calls·to·<code·class="inline">my_table</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_table</span><span·class="p"·data-group-id="0898342400-1">(</span><span·class="ss">get_next</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0898342400-2">[</span><span·class="p"·data-group-id="0898342400-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0898342400-3">[</span><span·class="mi">0</span><span·class="p"·data-group-id="0898342400-3">]</span><span·class="p"·data-group-id="0898342400-1">)</span><span·class="w">·</span><span·class="ow">and</span><span·class="w"> 
219 </span><span·class="nf">my_table</span><span·class="p"·data-group-id="0898342400-4">(</span><span·class="ss">get_next</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0898342400-5">[</span><span·class="mi">3</span><span·[·...·truncated·by·diffoscope;·len:·447,·SHA:·6771f49e129ffd1eb25f134019177e84d6ed3c733c9902bee1148e6f35915cc7·...·]217 ·········myTable.myTableEntry.4.1.2·}</code></pre><p>This·will·be·transform·into·one·call·to·<code·class="inline">my_table</code>:</p><pre><code·class="text">my_table(get_next,·[1,·2],·[3,·4])</code></pre><p>The·function·should·now·return:</p><pre><code·cl[·...·truncated·by·diffoscope;·len:·1463,·SHA:·7a3d0cca8798841b90a34bb965f17a6d3eaf7328728cb726e0238d6234f488d7·...·]
 218 ·········myTable.myTableEntry.1.3.2·}</code></pre><p>This·will·be·transform·into·two·calls·to·<code·class="inline">my_table</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_table</span><span·class="p"·data-group-id="6877188880-1">(</span><span·class="ss">get_next</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6877188880-2">[</span><span·class="p"·data-group-id="6877188880-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6877188880-3">[</span><span·class="mi">0</span><span·class="p"·data-group-id="6877188880-3">]</span><span·class="p"·data-group-id="6877188880-1">)</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">
 219 </span><span·class="nf">my_table</span><span·class="p"·data-group-id="6877188880-4">(</span><span·class="ss">get_next</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6877188880-5">[</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="6877188880-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6877188880-6">[</span><span·class="mi">1</span><span·class="p"·data-group-id="6877188880-6">]</span><span·class="p"·data-group-id="6877188880-4">)</span></code></pre><p>The·function·should·now·return:</p><pre><code·class="text">[{[3,·1,·1],·a}]·and
220 [{[3,·1,·1],·a}]</code></pre><p>In·both·cases,·the·first·accessible·element·in·the·table·should·be·returned.·As220 [{[3,·1,·1],·a}]</code></pre><p>In·both·cases,·the·first·accessible·element·in·the·table·should·be·returned.·As
221 the·key·columns·are·not·accessible,·this·means·that·the·third·column·is·the221 the·key·columns·are·not·accessible,·this·means·that·the·third·column·is·the
222 first·row.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Normally,·the·functions·described·above·behave·exactly·as·shown,·but·they·are222 first·row.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Normally,·the·functions·described·above·behave·exactly·as·shown,·but·they·are
223 free·to·perform·other·actions.·For·example,·a·get-request·may·have·side223 free·to·perform·other·actions.·For·example,·a·get-request·may·have·side
224 effects·such·as·setting·some·other·variable,·perhaps·a·global·<code·class="inline">lastAccessed</code>224 effects·such·as·setting·some·other·variable,·perhaps·a·global·<code·class="inline">lastAccessed</code>
225 variable.</p></section><h2·id="using-the-extraargument"·class="section-heading">225 variable.</p></section><h2·id="using-the-extraargument"·class="section-heading">
226 ··<a·href="#using-the-extraargument"·class="hover-link">226 ··<a·href="#using-the-extraargument"·class="hover-link">
Offset 229, 25 lines modifiedOffset 229, 25 lines modified
229 ··<span·class="text">Using·the·ExtraArgument</span>229 ··<span·class="text">Using·the·ExtraArgument</span>
230 </h2>230 </h2>
231 <p>The·<code·class="inline">ListOfExtraArguments</code>·can·be·used·to·write·generic·functions.·This·list·is231 <p>The·<code·class="inline">ListOfExtraArguments</code>·can·be·used·to·write·generic·functions.·This·list·is
232 appended·to·the·standard·arguments·for·each·function.·Consider·two·read-only232 appended·to·the·standard·arguments·for·each·function.·Consider·two·read-only
233 variables·for·a·device,·<code·class="inline">ipAdr</code>·and·<code·class="inline">name</code>·with·object·identifiers·1.1.23.4·and233 variables·for·a·device,·<code·class="inline">ipAdr</code>·and·<code·class="inline">name</code>·with·object·identifiers·1.1.23.4·and
234 1.1.7·respectively.·To·access·these·variables,·one·could·implement·the·two234 1.1.7·respectively.·To·access·these·variables,·one·could·implement·the·two
235 Erlang·functions·<code·class="inline">ip_access</code>·and·<code·class="inline">name_access</code>,·which·will·be·in·the·MIB.·The235 Erlang·functions·<code·class="inline">ip_access</code>·and·<code·class="inline">name_access</code>,·which·will·be·in·the·MIB.·The
236 functions·could·be·specified·in·a·text·file·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6337962921-1">{</span><span·class="ss">ipAdr</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6337962921-2">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ip_acce[·...·truncated·by·diffoscope;·len:·257,·SHA:·e61fb694d8484e376a49d159fcbba7647b067e3992b6e32b0f74a9af70bda9b0·...·]-1">}</span><span·class="p">.</span><span·class="w">236 functions·could·be·specified·in·a·text·file·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6281183656-1">{</span><span·class="ss">ipAdr</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6281183656-2">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ip_acce[·...·truncated·by·diffoscope;·len:·257,·SHA:·4bab1a6c9c7b216b9c57e7397b53133ebc0386ac21203a69b4fe7cbd80456407·...·]-1">}</span><span·class="p">.</span><span·class="w">
237 </span><span·class="c1">%·Or·using·the·oid·syntax·for·&#39;name&#39;</span><span·class="w">237 </span><span·class="c1">%·Or·using·the·oid·syntax·for·&#39;name&#39;</span><span·class="w">
238 </span><span·class="p"·data-group-id="6337962921-4">{</span><span·class="p"·data-group-id="6337962921-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="6337962921-5">]</span><span·[·...·truncated·by·diffoscope;·len:·459,·SHA:·e94e941ceab56415ecaff0839b55313f3f9d5f06b1c46ef7ec0f9c05e649cfea·...·]-4">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">ExtraArgument</code>·parameter·is·the·empty·list.·For·example,·when·the·agent238 </span><span·class="p"·data-group-id="6281183656-4">{</span><span·class="p"·data-group-id="6281183656-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="6281183656-5">]</span><span·[·...·truncated·by·diffoscope;·len:·459,·SHA:·30edeb48a298106d9d3580ba9b0697bcb9df585b7be8fae876d0554b0c20fe50·...·]-4">}</span><span·class="p">.</span></code></pre><p>The·<code·class="inline">ExtraArgument</code>·parameter·is·the·empty·list.·For·example,·when·the·agent
239 receives·a·get-request·for·the·<code·class="inline">ipAdr</code>·variable,·a·call·will·be·made·to239 receives·a·get-request·for·the·<code·class="inline">ipAdr</code>·variable,·a·call·will·be·made·to
240 <code·class="inline">ip_access(get)</code>.·The·value·returned·by·this·function·is·the·answer·to·the240 <code·class="inline">ip_access(get)</code>.·The·value·returned·by·this·function·is·the·answer·to·the
241 get-request.</p><p>If·<code·class="inline">ip_access</code>·and·<code·class="inline">name_access</code>·are·implemented·similarly,·we·could·write·a241 get-request.</p><p>If·<code·class="inline">ip_access</code>·and·<code·class="inline">name_access</code>·are·implemented·similarly,·we·could·write·a
242 <code·class="inline">generic_access</code>·function·using·the·<code·class="inline">ListOfExtraArguments</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8078717185-1">{</span><span·class="ss">ipAdr</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8078717185-2">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generi[·...·truncated·by·diffoscope;·len:·302,·SHA:·92e793e24c997ec500000cd8431c8f12732798124438ffa71ab0f390a1eaaa33·...·]-1">}</span><span·class="p">.</span><span·class="w">242 <code·class="inline">generic_access</code>·function·using·the·<code·class="inline">ListOfExtraArguments</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6174231258-1">{</span><span·class="ss">ipAdr</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6174231258-2">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generi[·...·truncated·by·diffoscope;·len:·302,·SHA:·e8ce3a396c8405fbb27a43c6dd4b30c793e1de8174f5a963bf25cff19ffd1b4d·...·]-1">}</span><span·class="p">.</span><span·class="w">
243 </span><span·class="c1">%·The·mnemonic·&#39;name&#39;·is·more·convenient·than·1.1.7</span><span·class="w">243 </span><span·class="c1">%·The·mnemonic·&#39;name&#39;·is·more·convenient·than·1.1.7</span><span·class="w">
244 </span><span·class="p"·data-group-id="8078717185-4">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8078717185-5">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generic_access</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8078717185-6">[</span><span·class="ss">&#39;NAME&#39;</span><span·class="p"·data-group-id="8078717185-6">]</span><span·class="p"·data-group-id="8078717185-5">}</span><span·class="p"·data-group-id="8078717185-4">}</span><span·class="p">.</span></code></pre><p>When·the·agent·receives·the·same·get-request·as·above,·a·call·will·be·made·to 
245 <code·class="inline">generic_access(get,</code>'<code·class="inline">IPADR')</code>.</p><p>Yet·another·possibility,·closer·to·the·hardware,·could·be:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0301663236-1">{</span><span·class="ss">ipAdr</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0301663236-2">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generic_access</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0301663236-3">[</span><span·class="mi">16#2543</span><span·class="p"·data-group-id="0301663236-3">]</span><span·class="p"·data-group-id="0301663236-2">}</span><span·class="p"·data-group-id="0301663236-1">}</span><span·class="p">.</span><span·class="w"> 
246 </span><span·class="p"·data-group-id="0301663236-4">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0301663236-5">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generic[·...·truncated·by·diffoscope;·len:·399,·SHA:·abb98485c33d8f0bfb170ad49c4a1739a8037b69e13a65afbba222aa52710822·...·]244 </span><span·class="p"·data-group-id="6174231258-4">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6174231258-5">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generic[·...·truncated·by·diffoscope;·len:·429,·SHA:·9daf86cbb00d57159c65431da93bd287fc2ec7631009193d239d92060ce84632·...·]
 245 <code·class="inline">generic_access(get,</code>'<code·class="inline">IPADR')</code>.</p><p>Yet·another·possibility,·closer·to·the·hardware,·could·be:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4427190491-1">{</span><span·class="ss">ipAdr</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4427190491-2">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generic_access</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4427190491-3">[</span><span·class="mi">16#2543</span><span·class="p"·data-group-id="4427190491-3">]</span><span·class="p"·data-group-id="4427190491-2">}</span><span·class="p"·data-group-id="4427190491-1">}</span><span·class="p">.</span><span·class="w">
 246 </span><span·class="p"·data-group-id="4427190491-4">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4427190491-5">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">generic_access</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4427190491-6">[</span><span·class="mi">16#A2B3</span><span·class="p"·data-group-id="4427190491-6">]</span><span·class="p"·data-group-id="4427190491-5">}</span><span·class="p"·data-group-id="4427190491-4">}</span><span·class="p">.</span></code></pre><h2·id="default-instrumentation"·class="section-heading">
247 ··<a·href="#default-instrumentation"·class="hover-link">247 ··<a·href="#default-instrumentation"·class="hover-link">
248 ····<i·class="ri-link-m"·aria-hidden="true"></i>248 ····<i·class="ri-link-m"·aria-hidden="true"></i>
249 ··</a>249 ··</a>
250 ··<span·class="text">Default·Instrumentation</span>250 ··<span·class="text">Default·Instrumentation</span>
251 </h2>251 </h2>
252 <p><a·href=""·id="snmp_3"></a></p><p>When·the·MIB·definition·work·is·finished,·there·are·two·major·issues·left.</p><ul><li>Implementing·the·MIB</li><li>Implementing·a·Manager·Application.</li></ul><p>Implementing·an·MIB·can·be·a·tedious·task.·Most·probably,·there·is·a·need·to252 <p><a·href=""·id="snmp_3"></a></p><p>When·the·MIB·definition·work·is·finished,·there·are·two·major·issues·left.</p><ul><li>Implementing·the·MIB</li><li>Implementing·a·Manager·Application.</li></ul><p>Implementing·an·MIB·can·be·a·tedious·task.·Most·probably,·there·is·a·need·to
253 test·the·agent·before·all·tables·and·variables·are·implemented.·In·this·case,253 test·the·agent·before·all·tables·and·variables·are·implemented.·In·this·case,
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345 ······<p·class="built-using">345 ······<p·class="built-using">
346 ········Built·using346 ········Built·using
347 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the347 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
348 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>348 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
349 ······</p>349 ······</p>
350 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>350 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
351 ····</footer>351 ····</footer>
352 ··</div>352 ··</div>
353 </main>353 </main>
354 </div>354 </div>
355 <script>355 <script>
356 ··function·mermaidLoaded()·{356 ··function·mermaidLoaded()·{
357 ····mermaid.initialize({357 ····mermaid.initialize({
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253 ······<p·class="built-using">253 ······<p·class="built-using">
254 ········Built·using254 ········Built·using
255 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the255 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
256 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>256 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
257 ······</p>257 ······</p>
258 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>258 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
259 ····</footer>259 ····</footer>
260 ··</div>260 ··</div>
261 </main>261 </main>
262 </div>262 </div>
263 <script>263 <script>
264 ··function·mermaidLoaded()·{264 ··function·mermaidLoaded()·{
265 ····mermaid.initialize({265 ····mermaid.initialize({
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145 and·<code·class="inline">IpPort</code>·is·an·integer.</p><p>When·<code·class="inline">Addr</code>·does·not·contain·a·port·number,·the·value·of·<code·class="inline">port</code>·is·used.</p><p>When·a·<code·class="inline">Addr</code>·is·not·specified·i.e·by·using·only·a·<code·class="inline">Domain</code>·atom,·the145 and·<code·class="inline">IpPort</code>·is·an·integer.</p><p>When·<code·class="inline">Addr</code>·does·not·contain·a·port·number,·the·value·of·<code·class="inline">port</code>·is·used.</p><p>When·a·<code·class="inline">Addr</code>·is·not·specified·i.e·by·using·only·a·<code·class="inline">Domain</code>·atom,·the
146 host's·name·is·resolved·to·find·the·IP·address,·and·the·value·of·<code·class="inline">port</code>·is146 host's·name·is·resolved·to·find·the·IP·address,·and·the·value·of·<code·class="inline">port</code>·is
147 used.</p></li></ul></li><li><p><code·class="inline">port</code>·-·which·defines·which·UDP·port·the·manager·uses·for·communicating147 used.</p></li></ul></li><li><p><code·class="inline">port</code>·-·which·defines·which·UDP·port·the·manager·uses·for·communicating
148 with·agents.·<em>Mandatory</em>·if·<code·class="inline">transports</code>·does·not·define·a·port·number·for148 with·agents.·<em>Mandatory</em>·if·<code·class="inline">transports</code>·does·not·define·a·port·number·for
149 every·transport.</p></li><li><p><code·class="inline">engine_id</code>·-·The·<code·class="inline">SnmpEngineID</code>·as·defined·in·SNMP-FRAMEWORK-MIB.149 every·transport.</p></li><li><p><code·class="inline">engine_id</code>·-·The·<code·class="inline">SnmpEngineID</code>·as·defined·in·SNMP-FRAMEWORK-MIB.
150 <em>Mandatory</em>.</p></li><li><p><code·class="inline">max_message_size</code>·-·The·<code·class="inline">snmpEngineMaxMessageSize</code>·as·defined·in150 <em>Mandatory</em>.</p></li><li><p><code·class="inline">max_message_size</code>·-·The·<code·class="inline">snmpEngineMaxMessageSize</code>·as·defined·in
151 SNMP-FRAMEWORK-MIB.·<em>Mandatory</em>.</p></li></ul></li><li><p><code·class="inline">Value</code>·is·the·value·for·the·variable.</p></li></ul><p>The·legacy·and·intermediate·variables·<code·class="inline">address</code>·and·<code·class="inline">domain</code>·are·still·supported151 SNMP-FRAMEWORK-MIB.·<em>Mandatory</em>.</p></li></ul></li><li><p><code·class="inline">Value</code>·is·the·value·for·the·variable.</p></li></ul><p>The·legacy·and·intermediate·variables·<code·class="inline">address</code>·and·<code·class="inline">domain</code>·are·still·supported
152 so·old·configurations·will·work.</p><p>The·following·example·shows·a·<code·class="inline">manager.conf</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1174248783-1">{</span><span·class="ss">transports</span><span·class="p">,</span><span·class="w">·······</span><span·class="p"·data-group-id="1174248783-2">[</span><span·class="p"·data-group-id="1174248783-3">{</span><span·class="ss">transportDomainUdpIpv4<[·...·truncated·by·diffoscope;·len:·561,·SHA:·e3b4856a0a852697f2cfa3e5e024afd0674c6624dc0022f29910c8c0b23c7ee2·...·]-3">}</span><span·class="p">,</span><span·class="w">152 so·old·configurations·will·work.</p><p>The·following·example·shows·a·<code·class="inline">manager.conf</code>·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0508843687-1">{</span><span·class="ss">transports</span><span·class="p">,</span><span·class="w">·······</span><span·class="p"·data-group-id="0508843687-2">[</span><span·class="p"·data-group-id="0508843687-3">{</span><span·class="ss">transportDomainUdpIpv4<[·...·truncated·by·diffoscope;·len:·561,·SHA:·2a2fe212fc381944d7397891cc586a717f495df6ae63ba5b5ddc4ce54125339c·...·]-3">}</span><span·class="p">,</span><span·class="w">
153 ····················</span><span·class="p"·data-group-id="1174248783-6">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1174248783-7">{</span><span·class="p"·data-group-id="1174248783-8">{</span><span·class="mi">0</span><span·cla[·...·truncated·by·diffoscope;·len:·663,·SHA:·64576f5f02e79eb3439d244ff2e77e8c5c1f70eaa56b54b6aeb5e79d94f0f3ae·...·]-1">}</span><span·class="p">.</span><span·class="w">153 ····················</span><span·class="p"·data-group-id="0508843687-6">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0508843687-7">{</span><span·class="p"·data-group-id="0508843687-8">{</span><span·class="mi">0</span><span·cla[·...·truncated·by·diffoscope;·len:·663,·SHA:·8668ebdd7422dc8bddcdd03956535369204501055dc7f6c485dba718dc3a45b7·...·]-1">}</span><span·class="p">.</span><span·class="w">
154 </span><span·class="p"·data-group-id="1174248783-9">{</span><span·class="ss">engine_id</span><span·class="p">,</span><span·class="w">········</span><span·class="s">&quot;mgrEngine&quot;</span><span·class="p"·data-group-id="1174248783-9">}</span><span·class="p">.</span><span·class="w">154 </span><span·class="p"·data-group-id="0508843687-9">{</span><span·class="ss">engine_id</span><span·class="p">,</span><span·class="w">········</span><span·class="s">&quot;mgrEngine&quot;</span><span·class="p"·data-group-id="0508843687-9">}</span><span·class="p">.</span><span·class="w">
155 </span><span·class="p"·data-group-id="1174248783-10">{</span><span·class="ss">max_message_size</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">484</span><span·class="p"·data-group-id="1174248783-10">}</span><span·class="p">.</span></code></pre><p>The·value·of·<code·class="inline">engine_id</code>·is·a·string,·which·should·have·a·very·specific155 </span><span·class="p"·data-group-id="0508843687-10">{</span><span·class="ss">max_message_size</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">484</span><span·class="p"·data-group-id="0508843687-10">}</span><span·class="p">.</span></code></pre><p>The·value·of·<code·class="inline">engine_id</code>·is·a·string,·which·should·have·a·very·specific
156 structure.·See·RFC·2271/2571·for·details.</p><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">156 structure.·See·RFC·2271/2571·for·details.</p><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
157 </span><span·class="n">Port</span><span·class="w">··········</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p">,</span><span·class="w">157 </span><span·class="n">Port</span><span·class="w">··········</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">5000</span><span·class="p">,</span><span·class="w">
158 </span><span·class="n">Addr4</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0312165666-1">{</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">213</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">24</span><span·class="p"·data-group-id="0312165666-1">}</span><span·class="p">,</span><span·class="w">158 </span><span·class="n">Addr4</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1025447339-1">{</span><span·class="mi">141</span><span·class="p">,</span><span·class="mi">213</span><span·class="p">,</span><span·class="mi">11</span><span·class="p">,</span><span·class="mi">24</span><span·class="p"·data-group-id="1025447339-1">}</span><span·class="p">,</span><span·class="w">
159 </span><span·class="n">Addr6</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0312165666-2">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·175,·SHA:·16c6196aeecf988c3d271a89d341f36099b3af6f72499519f277b4153e1c9d9a·...·]-2">}</span><span·class="p">,</span><span·class="w">159 </span><span·class="n">Addr6</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1025447339-2">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="[·...·truncated·by·diffoscope;·len:·175,·SHA:·61d7aca2f34dadcc089f25e9cc953198a0c3919bd5501f7074a20a0e96e4cf7a·...·]-2">}</span><span·class="p">,</span><span·class="w">
160 </span><span·class="n">Transports</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0312165666-3">[</span><span·class="p"·data-group-id="0312165666-4">{</span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0312165666-5">{</span><span·class="n">Addr4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="0312165666-5">}</span><span·class="p"·data-group-id="0312165666-4">}</span><span·class="p">,</span><span·class="w"> 
161 ·················</span><span·class="p"·data-group-id="0312165666-6">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0312165666-7">{</span><span·class="n">Addr6</span><spa[·...·truncated·by·diffoscope;·len:·223,·SHA:·c32ade1a6871a06f27d01f396b65b8d78a3c8602e33b539e6fcecf14f8f01182·...·]</span><span·class="p">,</span><span·class="w">160 </span><span·class="n">Transports</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1025447339-3">[</span><span·class="p"·data-group-id="1025447339-4">{</span><span·class="ss">transportDomainUdp[·...·truncated·by·diffoscope;·len:·314,·SHA:·9e41bbe7be65aa915578026f19f3e8f884139095e074b43486bfb6d4925241d3·...·]</span><span·class="p">,</span><span·class="w">
 161 ·················</span><span·class="p"·data-group-id="1025447339-6">{</span><span·class="ss">transportDomainUdpIpv6</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1025447339-7">{</span><span·class="n">Addr6</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Port</span><span·class="p"·data-group-id="1025447339-7">}</span><span·class="p"·data-group-id="1025447339-6">}</span><span·class="p"·data-group-id="1025447339-3">]</span><span·class="p">,</span><span·class="w">
162 </span><span·class="n">EngineID</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;mgrEngine&quot;</span><span·class="p">,</span><span·class="w">162 </span><span·class="n">EngineID</span><span·class="w">······</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;mgrEngine&quot;</span><span·class="p">,</span><span·class="w">
163 </span><span·class="n">MMS</span><span·class="w">···········</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">484</span><span·class="p">,</span><span·class="w">163 </span><span·class="n">MMS</span><span·class="w">···········</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">484</span><span·class="p">,</span><span·class="w">
164 </span><span·class="n">ManagerConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0312165666-8">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">manager_entry</span><span·class="p"·data-group-id="0312165666-9">(</span><span·class="ss">transports</span><span·class="p">,</span><span·class="w">·······</spa[·...·truncated·by·diffoscope;·len:·76,·SHA:·4372e4872165c183463e562e0ddd36fb7d926233ab905d32a7b24fd4d22d1d5f·...·]-9">)</span><span·class="p">,</span><span·class="w">164 </span><span·class="n">ManagerConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1025447339-8">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">manager_entry</span><span·class="p"·data-group-id="1025447339-9">(</span><span·class="ss">transports</span><span·class="p">,</span><span·class="w">·······</spa[·...·truncated·by·diffoscope;·len:·76,·SHA:·ff09a9b510d43b8115f02c58a49d2100dd1442cd8a9f67ac4db67ca133015f0f·...·]-9">)</span><span·class="p">,</span><span·class="w">
165 ·················</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">manager_entry</span><span·class="p"·data-group-id="0312165666-10">(</span><span·class="ss">engine_id</span><span·class="p">,</span><span·class="w">········</span><span·class="n">EngineID</span><span·class="p"·data-group-id="0312165666-10">)</span><span·class="p">,</span><span·class="w">165 ·················</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">manager_entry</span><span·class="p"·data-group-id="1025447339-10">(</span><span·class="ss">engine_id</span><span·class="p">,</span><span·class="w">········</span><span·class="n">EngineID</span><span·class="p"·data-group-id="1025447339-10">)</span><span·class="p">,</span><span·class="w">
166 ·················</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">manager_entry</span><span·class="p"·data-group-id="0312165666-11">(</span><span·class="ss">max_message_size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MMS</span><span·class="p"·data-group-id="0312165666-11">)</span><span·class="p"·data-group-id="0312165666-8">]</span><span·class="p">,</span><span·class="w">166 ·················</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">manager_entry</span><span·class="p"·data-group-id="1025447339-11">(</span><span·class="ss">max_message_size</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MMS</span><span·class="p"·data-group-id="1025447339-11">)</span><span·class="p"·data-group-id="1025447339-8">]</span><span·class="p">,</span><span·class="w">
167 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_manager_config</span><span·class="p"·data-group-id="0312165666-12">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ManagerConfig</span><span·class="p"·data-group-id="0312165666-12">)</span><span·class="p">,</span></code></pre><h2·id="users"·class="section-heading">167 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_manager_config</span><span·class="p"·data-group-id="1025447339-12">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ManagerConfig</span><span·class="p"·data-group-id="1025447339-12">)</span><span·class="p">,</span></code></pre><h2·id="users"·class="section-heading">
168 ··<a·href="#users"·class="hover-link">168 ··<a·href="#users"·class="hover-link">
169 ····<i·class="ri-link-m"·aria-hidden="true"></i>169 ····<i·class="ri-link-m"·aria-hidden="true"></i>
170 ··</a>170 ··</a>
171 ··<span·class="text">Users</span>171 ··<span·class="text">Users</span>
172 </h2>172 </h2>
173 <p>For·each·<em>manager·user</em>,·the·manager·needs·some·information.·This·information·is173 <p>For·each·<em>manager·user</em>,·the·manager·needs·some·information.·This·information·is
174 either·added·in·the·<code·class="inline">users.conf</code>·config·file·or·by·calling·the174 either·added·in·the·<code·class="inline">users.conf</code>·config·file·or·by·calling·the
175 <a·href="snmpm.html#register_user/4">register_user</a>·function·in·run-time.</p><p>Each·row·defines·a·<em>manager·user</em>·of·the·manager.</p><p>Each·entry·is·a·tuple·of·size·four:</p><p><code·class="inline">{UserId,·UserMod,·UserData,·DefaultAgentConfig}.</code></p><ul><li><code·class="inline">UserId</code>·is·any·term·(used·to·uniquely·identify·the·user).</li><li><code·class="inline">UserMod</code>·is·the·user·callback·module·(atom).</li><li><code·class="inline">UserData</code>·is·any·term·(passed·on·to·the·user·when·calling·the·<code·class="inline">UserMod</code>.</li><li><code·class="inline">DefaultAgentConfig</code>·is·a·list·of·default·agent·config's.·These·values·are175 <a·href="snmpm.html#register_user/4">register_user</a>·function·in·run-time.</p><p>Each·row·defines·a·<em>manager·user</em>·of·the·manager.</p><p>Each·entry·is·a·tuple·of·size·four:</p><p><code·class="inline">{UserId,·UserMod,·UserData,·DefaultAgentConfig}.</code></p><ul><li><code·class="inline">UserId</code>·is·any·term·(used·to·uniquely·identify·the·user).</li><li><code·class="inline">UserMod</code>·is·the·user·callback·module·(atom).</li><li><code·class="inline">UserData</code>·is·any·term·(passed·on·to·the·user·when·calling·the·<code·class="inline">UserMod</code>.</li><li><code·class="inline">DefaultAgentConfig</code>·is·a·list·of·default·agent·config's.·These·values·are
176 used·as·default·values·when·this·user·registers·agents.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">176 used·as·default·values·when·this·user·registers·agents.</li></ul><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">·········</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
177 </span><span·class="n">UserID</span><span·class="w">·············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="1233484496-1">(</span><span·class="p"·data-group-id="1233484496-1">)</span><span·class="p">,</span><span·class="w">177 </span><span·class="n">UserID</span><span·class="w">·············</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">make_ref</span><span·class="p"·data-group-id="0494924325-1">(</span><span·class="p"·data-group-id="0494924325-1">)</span><span·class="p">,</span><span·class="w">
178 </span><span·class="n">UserMod</span><span·class="w">············</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">my_manager_callback_mod</span><span·class="p">,</span><span·class="w">178 </span><span·class="n">UserMod</span><span·class="w">············</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">my_manager_callback_mod</span><span·class="p">,</span><span·class="w">
179 </span><span·class="n">UserData</span><span·class="w">···········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="1233484496-2">(</span><span·class="p"·data-group-id="1233484496-2">)</span><span·class="p">,</span><span·class="w">179 </span><span·class="n">UserData</span><span·class="w">···········</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="0494924325-2">(</span><span·class="p"·data-group-id="0494924325-2">)</span><span·class="p">,</span><span·class="w">
180 </span><span·class="n">DefaultAgentConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1233484496-3">[</span><span·class="p"·data-group-id="1233484496-4">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">v1</span><span·class="p"·data-group-id="1233484496-4">}</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·548,·SHA:·1e2649d5d8bd300bbf8da4b077c83e863c0c5ea374f07a1835e486705278e7ac·...·]-3">]</span><span·class="p">,</span><span·class="w">180 </span><span·class="n">DefaultAgentConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0494924325-3">[</span><span·class="p"·data-group-id="0494924325-4">{</span><span·class="ss">version</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">v1</span><span·class="p"·data-group-id="0494924325-4">}</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·548,·SHA:·699cb942972d04ed3b8bd2f1b4197182acd477bb14dab5199c11e9c7fa676d65·...·]-3">]</span><span·class="p">,</span><span·class="w">
181 </span><span·class="n">UsersConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1233484496-7">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">users_entry</span><span·class="p"·data-group-id="1233484496-8">(</span><span·class="n">UserID</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserMod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserData</span><span·class="p">,</span><span·class="w">181 </span><span·class="n">UsersConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0494924325-7">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">users_entry</span><span·class="p"·data-group-id="0494924325-8">(</span><span·class="n">UserID</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserMod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserData</span><span·class="p">,</span><span·class="w">
182 ······································</span><span·class="n">DefaultAgentConfig</span><span·class="p"·data-group-id="1233484496-8">)</span><span·class="p"·data-group-id="1233484496-7">]</span><span·class="p">,</span><span·class="w">182 ······································</span><span·class="n">DefaultAgentConfig</span><span·class="p"·data-group-id="0494924325-8">)</span><span·class="p"·data-group-id="0494924325-7">]</span><span·class="p">,</span><span·class="w">
183 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_users_config</span><span·class="p"·data-group-id="1233484496-9">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UsersConfig</span><span·class="p"·data-group-id="1233484496-9">)</span><span·class="p">,</span></code></pre><h2·id="agents"·class="section-heading">183 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_users_config</span><span·class="p"·data-group-id="0494924325-9">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UsersConfig</span><span·class="p"·data-group-id="0494924325-9">)</span><span·class="p">,</span></code></pre><h2·id="agents"·class="section-heading">
184 ··<a·href="#agents"·class="hover-link">184 ··<a·href="#agents"·class="hover-link">
185 ····<i·class="ri-link-m"·aria-hidden="true"></i>185 ····<i·class="ri-link-m"·aria-hidden="true"></i>
186 ··</a>186 ··</a>
187 ··<span·class="text">Agents</span>187 ··<span·class="text">Agents</span>
188 </h2>188 </h2>
189 <p>The·information·needed·to·handle·agents·should·be·stored·in·a·file·called189 <p>The·information·needed·to·handle·agents·should·be·stored·in·a·file·called
190 <code·class="inline">agents.conf</code>.·It·is·also·possible·to·add·agents·in·run-time·by·calling·the190 <code·class="inline">agents.conf</code>.·It·is·also·possible·to·add·agents·in·run-time·by·calling·the
Offset 194, 31 lines modifiedOffset 194, 31 lines modified
194 tuple·or·a·traditional·SNMP·integer·list·containing·port·number.·<code·class="inline">IpAddr</code>·is194 tuple·or·a·traditional·SNMP·integer·list·containing·port·number.·<code·class="inline">IpAddr</code>·is
195 either·a·regular·Erlang/OTP·<a·href="../../../../lib/kernel-10.2.6/doc/html/inet.html#t:ip_address/0"><code·class="inline">ip_address()</code></a>·or·a195 either·a·regular·Erlang/OTP·<a·href="../../../../lib/kernel-10.2.6/doc/html/inet.html#t:ip_address/0"><code·class="inline">ip_address()</code></a>·or·a
196 traditional·SNMP·integer·list·not·containing·port·number,·and·<code·class="inline">IpPort</code>·is·an196 traditional·SNMP·integer·list·not·containing·port·number,·and·<code·class="inline">IpPort</code>·is·an
197 integer.</li><li><code·class="inline">EngineID</code>·is·the·engine-id·of·the·agent·(string).</li><li><p><code·class="inline">Timeout</code>·is·re-transmission·timeout·(<code·class="inline">infinity</code>·|·integer).</p></li><li><code·class="inline">MaxMessageSize</code>·is·the·max·message·size·for·outgoing·messages·to·this·agent197 integer.</li><li><code·class="inline">EngineID</code>·is·the·engine-id·of·the·agent·(string).</li><li><p><code·class="inline">Timeout</code>·is·re-transmission·timeout·(<code·class="inline">infinity</code>·|·integer).</p></li><li><code·class="inline">MaxMessageSize</code>·is·the·max·message·size·for·outgoing·messages·to·this·agent
198 (integer).</li><li><p><code·class="inline">Version</code>·is·the·version·(v1·|·v2·|·v3).</p></li><li><p><code·class="inline">SecModel</code>·is·the·security·model·(any·|·v1·|·v2c·|·usm).</p></li><li><code·class="inline">SecName</code>·is·the·security·name·(string).</li><li><p><code·class="inline">SecLevel</code>·is·security·level·(noAuthNoPriv·|·authNoPriv·|·authPriv).</p></li></ul><p>Legacy·configurations·using·tuples·without·<code·class="inline">Domain</code>·element,·as·well·as·with·all198 (integer).</li><li><p><code·class="inline">Version</code>·is·the·version·(v1·|·v2·|·v3).</p></li><li><p><code·class="inline">SecModel</code>·is·the·security·model·(any·|·v1·|·v2c·|·usm).</p></li><li><code·class="inline">SecName</code>·is·the·security·name·(string).</li><li><p><code·class="inline">SecLevel</code>·is·security·level·(noAuthNoPriv·|·authNoPriv·|·authPriv).</p></li></ul><p>Legacy·configurations·using·tuples·without·<code·class="inline">Domain</code>·element,·as·well·as·with·all
199 <code·class="inline">TDomain</code>,·<code·class="inline">Ip</code>·and·<code·class="inline">Port</code>·elements·still·work.</p><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">199 <code·class="inline">TDomain</code>,·<code·class="inline">Ip</code>·and·<code·class="inline">Port</code>·elements·still·work.</p><p>And·this·is·a·code·(snippet)·example·of·how·to·generate·this·file·in·runtime:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
200 </span><span·class="n">UserID</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">200 </span><span·class="n">UserID</span><span·class="w">·······</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
201 </span><span·class="n">AgentsConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4106775652-1">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">agents_entry</span><span·class="p"·data-group-id="4106775652-2">(</span><span·class="n">UserID</span><span·class="p">,</span><span·class="w">201 </span><span·class="n">AgentsConfig</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4274962948-1">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">agents_entry</span><span·class="p"·data-group-id="4274962948-2">(</span><span·class="n">UserID</span><span·class="p">,</span><span·class="w">
202 ········································</span><span·class="s">&quot;target·1&quot;</span><span·class="p">,</span><span·class="w">202 ········································</span><span·class="s">&quot;target·1&quot;</span><span·class="p">,</span><span·class="w">
203 »       »       »       »       »       </span><span·class="s">&quot;FOOBAR&quot;</span><span·class="p">,</span><span·class="w">203 »       »       »       »       »       </span><span·class="s">&quot;FOOBAR&quot;</span><span·class="p">,</span><span·class="w">
204 »       »       »       »       »       </span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4106775652-3">{</span><span·class="p"·data-group-id="4106775652-4">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·clas[·...·truncated·by·diffoscope;·len:·135,·SHA:·e226b9bd49c2f6179cb85cfe71a85d0a7501240384e4621b8acbfe26b59076de·...·]-3">}</span><span·class="p">,</span><span·class="w">204 »       »       »       »       »       </span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4274962948-3">{</span><span·class="p"·data-group-id="4274962948-4">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·clas[·...·truncated·by·diffoscope;·len:·135,·SHA:·ba6a36d60b714793fb6da365d6f65af32c6cb57b5f8feff7460539bac872477e·...·]-3">}</span><span·class="p">,</span><span·class="w">
205 »       »       »       »       »       </span><span·class="s">&quot;agent·Engine·1&quot;</span><span·class="w">205 »       »       »       »       »       </span><span·class="s">&quot;agent·Engine·1&quot;</span><span·class="w">
206 »       »       »       »       »       </span><span·class="mi">1500</span><span·class="p">,</span><span·class="w">206 »       »       »       »       »       </span><span·class="mi">1500</span><span·class="p">,</span><span·class="w">
207 »       »       »       »       »       </span><span·class="mi">484</span><span·class="p">.</span><span·class="w">207 »       »       »       »       »       </span><span·class="mi">484</span><span·class="p">.</span><span·class="w">
208 »       »       »       »       »       </span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sec·name·1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">noAuthNoPriv</span><span·class="p"·data-group-id="4106775652-2">)</span><span·class="p">,</span><span·class="w">208 »       »       »       »       »       </span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sec·name·1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">noAuthNoPriv</span><span·class="p"·data-group-id="4274962948-2">)</span><span·class="p">,</span><span·class="w">
209 »       »       </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">agents_entry</span><span·class="p"·data-group-id="4106775652-5">(</span><span·class="n">UserID</span><span·class="p">,</span><span·class="w">209 »       »       </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">agents_entry</span><span·class="p"·data-group-id="4274962948-5">(</span><span·class="n">UserID</span><span·class="p">,</span><span·class="w">
210 ········································</span><span·class="s">&quot;target·2&quot;</span><span·class="p">,</span><span·class="w">210 ········································</span><span·class="s">&quot;target·2&quot;</span><span·class="p">,</span><span·class="w">
211 »       »       »       »       »       </span><span·class="s">&quot;FOOBAR&quot;</span><span·class="p">,</span><span·class="w">211 »       »       »       »       »       </span><span·class="s">&quot;FOOBAR&quot;</span><span·class="p">,</span><span·class="w">
212 »       »       »       »       »       </span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4106775652-6">{</span><span·class="p"·data-group-id="4106775652-7">{</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">8</span><span·clas[·...·truncated·by·diffoscope;·len:·135,·SHA:·7117474c4b65cf9de7c1b9124f33c4f31da1ecaa8f9067f976296b2e793d35bf·...·]-6">}</span><span·class="p">,</span><span·class="w">212 »       »       »       »       »       </span><span·class="ss">transportDomainUdpIpv4</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4274962948-6">{</span><span·class="p"·data-group-id="4274962948-7">{</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">6</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">8</span><span·clas[·...·truncated·by·diffoscope;·len:·135,·SHA:·61789d70286dd7abc48e344f0df4e9aa20be5afe5076eba257faee2e8cb6ff4f·...·]-6">}</span><span·class="p">,</span><span·class="w">
213 »       »       »       »       »       </span><span·class="s">&quot;agent·Engine·2&quot;</span><span·class="w">213 »       »       »       »       »       </span><span·class="s">&quot;agent·Engine·2&quot;</span><span·class="w">
214 »       »       »       »       »       </span><span·class="mi">1500</span><span·class="p">,</span><span·class="w">214 »       »       »       »       »       </span><span·class="mi">1500</span><span·class="p">,</span><span·class="w">
215 »       »       »       »       »       </span><span·class="mi">1000</span><span·class="p">.</span><span·class="w">215 »       »       »       »       »       </span><span·class="mi">1000</span><span·class="p">.</span><span·class="w">
216 »       »       »       »       »       </span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sec·name·2&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">noAuthNoPriv</span><span·class="p"·data-group-id="4106775652-5">)</span><span·class="p"·data-group-id="4106775652-1">]</span><span·class="p">,</span><span·class="w">216 »       »       »       »       »       </span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">v1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;sec·name·2&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">noAuthNoPriv</span><span·class="p"·data-group-id="4274962948-5">)</span><span·class="p"·data-group-id="4274962948-1">]</span><span·class="p">,</span><span·class="w">
217 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_agents_config</span><span·class="p"·data-group-id="4106775652-8">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UsersConfig</span><span·class="p"·data-group-id="4106775652-8">)</span><span·class="p">,</span></code></pre><h2·id="security-data-for-usm"·class="section-heading">217 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_agents_config</span><span·class="p"·data-group-id="4274962948-8">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UsersConfig</span><span·class="p"·data-group-id="4274962948-8">)</span><span·class="p">,</span></code></pre><h2·id="security-data-for-usm"·class="section-heading">
218 ··<a·href="#security-data-for-usm"·class="hover-link">218 ··<a·href="#security-data-for-usm"·class="hover-link">
219 ····<i·class="ri-link-m"·aria-hidden="true"></i>219 ····<i·class="ri-link-m"·aria-hidden="true"></i>
220 ··</a>220 ··</a>
221 ··<span·class="text">Security·data·for·USM</span>221 ··<span·class="text">Security·data·for·USM</span>
222 </h2>222 </h2>
223 <p>The·information·about·Security·data·for·USM·should·be·stored·in·a·file·called223 <p>The·information·about·Security·data·for·USM·should·be·stored·in·a·file·called
224 <code·class="inline">usm.conf</code>,·which·must·be·present·if·the·manager·wishes·to·use·SNMPv3·when224 <code·class="inline">usm.conf</code>,·which·must·be·present·if·the·manager·wishes·to·use·SNMPv3·when
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229 <code·class="inline">usmHMAC192SH256AuthProtocol</code>,·<code·class="inline">usmHMAC256SHA384AuthProtocol</code>·or229 <code·class="inline">usmHMAC192SH256AuthProtocol</code>,·<code·class="inline">usmHMAC256SHA384AuthProtocol</code>·or
230 <code·class="inline">usmHMAC384SHA512AuthProtocol</code>.</p></li><li><p><code·class="inline">AuthKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized230 <code·class="inline">usmHMAC384SHA512AuthProtocol</code>.</p></li><li><p><code·class="inline">AuthKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized
231 authentication·key.·It·is·not·visible·in·the·MIB.·The·length·(number·of231 authentication·key.·It·is·not·visible·in·the·MIB.·The·length·(number·of
232 octets)·of·this·key·needs·to·be:</p><ul><li>16·if·<code·class="inline">usmHMACMD5AuthProtocol</code>.</li><li>20·if·<code·class="inline">usmHMACSHAAuthProtocol</code>.</li><li>28·if·<code·class="inline">usmHMAC128SHA224AuthProtocol</code>.</li><li>32·if·<code·class="inline">usmHMAC192SHA256AuthProtocol</code>.</li><li>48·if·<code·class="inline">usmHMAC256SHA384AuthProtocol</code>.</li><li>64·if·<code·class="inline">usmHMAC384SHA512AuthProtocol</code>.</li></ul></li><li><p><code·class="inline">PrivP</code>·is·a·<code·class="inline">usmNoPrivProtocol</code>,·<code·class="inline">usmDESPrivProtocol</code>·or232 octets)·of·this·key·needs·to·be:</p><ul><li>16·if·<code·class="inline">usmHMACMD5AuthProtocol</code>.</li><li>20·if·<code·class="inline">usmHMACSHAAuthProtocol</code>.</li><li>28·if·<code·class="inline">usmHMAC128SHA224AuthProtocol</code>.</li><li>32·if·<code·class="inline">usmHMAC192SHA256AuthProtocol</code>.</li><li>48·if·<code·class="inline">usmHMAC256SHA384AuthProtocol</code>.</li><li>64·if·<code·class="inline">usmHMAC384SHA512AuthProtocol</code>.</li></ul></li><li><p><code·class="inline">PrivP</code>·is·a·<code·class="inline">usmNoPrivProtocol</code>,·<code·class="inline">usmDESPrivProtocol</code>·or
233 <code·class="inline">usmAesCfb128Protocol</code>.</p></li><li><p><code·class="inline">PrivKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized233 <code·class="inline">usmAesCfb128Protocol</code>.</p></li><li><p><code·class="inline">PrivKey</code>·is·a·list·(of·integer).·This·is·the·User's·secret·localized
234 encryption·key.·It·is·not·visible·in·the·MIB.·The·length·of·this·key·needs·to234 encryption·key.·It·is·not·visible·in·the·MIB.·The·length·of·this·key·needs·to
235 be·16·if·<code·class="inline">usmDESPrivProtocol</code>·or·<code·class="inline">usmAesCfb128Protocol</code>·is·used.</p></li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">235 be·16·if·<code·class="inline">usmDESPrivProtocol</code>·or·<code·class="inline">usmAesCfb128Protocol</code>·is·used.</p></li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ManagerDir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;/tmp&quot;</span><span·class="p">,</span><span·class="w">
236 </span><span·class="n">UsmConfig</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8142488014-1">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">usm_entry</span><span·class="p"·data-group-id="8142488014-2">(</span><span·class="s">&quot;engine&quot;</span><span·class="p">,</span><span·class="w">236 </span><span·class="n">UsmConfig</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4146462206-1">[</span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">usm_entry</span><span·class="p"·data-group-id="4146462206-2">(</span><span·class="s">&quot;engine&quot;</span><span·class="p">,</span><span·class="w">
237 ···································</span><span·class="s">&quot;user·1&quot;</span><span·class="p">,</span><span·class="w">237 ···································</span><span·class="s">&quot;user·1&quot;</span><span·class="p">,</span><span·class="w">
238 »       ···························</span><span·class="ss">usmNoAuthProtocol</span><span·class="p">,</span><span·class="w">238 »       ···························</span><span·class="ss">usmNoAuthProtocol</span><span·class="p">,</span><span·class="w">
239 »       ·»       »       »       ···</span><span·class="p"·data-group-id="8142488014-3">[</span><span·class="p"·data-group-id="8142488014-3">]</span><span·class="p">,</span><span·class="w">239 »       ·»       »       »       ···</span><span·class="p"·data-group-id="4146462206-3">[</span><span·class="p"·data-group-id="4146462206-3">]</span><span·class="p">,</span><span·class="w">
240 »       ·»       »       »       ···</span><span·class="ss">usmNoPrivProtocol</span><span·class="p">,</span><span·class="w">240 »       ·»       »       »       ···</span><span·class="ss">usmNoPrivProtocol</span><span·class="p">,</span><span·class="w">
241 »       ·»       »       »       ···</span><span·class="p"·data-group-id="8142488014-4">[</span><span·class="p"·data-group-id="8142488014-4">]</span><span·class="p"·data-group-id="8142488014-2">)</span><span·class="p"·data-group-id="8142488014-1">]</span><span·class="p">,</span><span·class="w">241 »       ·»       »       »       ···</span><span·class="p"·data-group-id="4146462206-4">[</span><span·class="p"·data-group-id="4146462206-4">]</span><span·class="p"·data-group-id="4146462206-2">)</span><span·class="p"·data-group-id="4146462206-1">]</span><span·class="p">,</span><span·class="w">
242 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_usm_config</span><span·class="p"·data-group-id="8142488014-5">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UsmConfig</span><span·class="p"·data-group-id="8142488014-5">)</span><span·class="p">,</span></code></pre>242 </span><span·class="nc">snmpm_conf</span><span·class="p">:</span><span·class="nf">write_usm_config</span><span·class="p"·data-group-id="4146462206-5">(</span><span·class="n">ManagerDir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UsmConfig</span><span·class="p"·data-group-id="4146462206-5">)</span><span·class="p">,</span></code></pre>
243 </div>243 </div>
  
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291 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>291 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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137 before·it·will·be·compiled.·This·text·file·must·have·the·same·name·as·the·MIB,137 before·it·will·be·compiled.·This·text·file·must·have·the·same·name·as·the·MIB,
138 but·with·the·suffix·<code·class="inline">.mib</code>.·This·is·necessary·for·handling·the·<code·class="inline">IMPORT</code>138 but·with·the·suffix·<code·class="inline">.mib</code>.·This·is·necessary·for·handling·the·<code·class="inline">IMPORT</code>
139 statement.</p><p>The·association·file,·which·contains·the·names·of·instrumentation·functions·for139 statement.</p><p>The·association·file,·which·contains·the·names·of·instrumentation·functions·for
140 the·MIB,·should·have·the·suffix·<code·class="inline">.funcs</code>.·If·the·compiler·does·not·find·the140 the·MIB,·should·have·the·suffix·<code·class="inline">.funcs</code>.·If·the·compiler·does·not·find·the
141 association·file,·it·gives·a·warning·message·and·uses·default·instrumentation141 association·file,·it·gives·a·warning·message·and·uses·default·instrumentation
142 functions.·(See·<a·href="snmp_instr_functions.html#snmp_3">Default·Instrumentation</a>·for142 functions.·(See·<a·href="snmp_instr_functions.html#snmp_3">Default·Instrumentation</a>·for
143 more·details).</p><p>The·MIB·compiler·is·started·with·a·call·to·<code·class="inline">snmpc:compile(&lt;mibname&gt;).</code>·For143 more·details).</p><p>The·MIB·compiler·is·started·with·a·call·to·<code·class="inline">snmpc:compile(&lt;mibname&gt;).</code>·For
144 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="7309829822-1">(</span><span·class="s">&quot;RFC1213-MIB&quot;</span><span·class="p"·data-group-id="7309829822-1">)</span><span·class="p">.</span></code></pre><p>The·output·is·a·new·file·which·is·called·<code·class="inline">&lt;mibname&gt;.bin</code>.</p><p>The·MIB·compiler·understands·both·SMIv1·and·SMIv2·MIBs.·It·uses·the144 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="2786366931-1">(</span><span·class="s">&quot;RFC1213-MIB&quot;</span><span·class="p"·data-group-id="2786366931-1">)</span><span·class="p">.</span></code></pre><p>The·output·is·a·new·file·which·is·called·<code·class="inline">&lt;mibname&gt;.bin</code>.</p><p>The·MIB·compiler·understands·both·SMIv1·and·SMIv2·MIBs.·It·uses·the
145 MODULE-IDENTITY·statement·to·determinate·if·the·MIB·is·written·in·SMI·version·1145 MODULE-IDENTITY·statement·to·determinate·if·the·MIB·is·written·in·SMI·version·1
146 or·2.</p><h2·id="importing-mibs"·class="section-heading">146 or·2.</p><h2·id="importing-mibs"·class="section-heading">
147 ··<a·href="#importing-mibs"·class="hover-link">147 ··<a·href="#importing-mibs"·class="hover-link">
148 ····<i·class="ri-link-m"·aria-hidden="true"></i>148 ····<i·class="ri-link-m"·aria-hidden="true"></i>
149 ··</a>149 ··</a>
150 ··<span·class="text">Importing·MIBs</span>150 ··<span·class="text">Importing·MIBs</span>
151 </h2>151 </h2>
152 <p>The·compiler·handles·the·<code·class="inline">IMPORT</code>·statement.·It·is·important·to·import·the152 <p>The·compiler·handles·the·<code·class="inline">IMPORT</code>·statement.·It·is·important·to·import·the
153 compiled·file·and·not·the·ASN.1·(source)·file.·A·MIB·must·be·recompiled·to·make153 compiled·file·and·not·the·ASN.1·(source)·file.·A·MIB·must·be·recompiled·to·make
154 changes·visible·to·other·MIBs·importing·it.</p><p>The·compiled·files·of·the·imported·MIBs·must·be·present·in·the·current154 changes·visible·to·other·MIBs·importing·it.</p><p>The·compiled·files·of·the·imported·MIBs·must·be·present·in·the·current
155 directory,·or·a·directory·in·the·current·path.·The·path·is·supplied·with·the155 directory,·or·a·directory·in·the·current·path.·The·path·is·supplied·with·the
156 <code·class="inline">{i,·Path}</code>·option,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="1472261458-1">(</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p">,</span><span·class="w">156 <code·class="inline">{i,·Path}</code>·option,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="2221463474-1">(</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p">,</span><span·class="w">
157 ·······</span><span·class="p"·data-group-id="1472261458-2">[</span><span·class="p"·data-group-id="1472261458-3">{</span><span·class="ss">i</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1472261458-4">[</span><span·class="s">&quot;friend_mibs/&quot;</span><span·cl[·...·truncated·by·diffoscope;·len:·292,·SHA:·dc02152569ccd1af888e351598e04a9ef99eb28786e5c3348bfb10bd728094e8·...·]-1">)</span><span·class="p">.</span></code></pre><p>It·is·also·possible·to·import·MIBs·from·OTP·applications·in·an·<code·class="inline">&quot;include_lib&quot;</code>157 ·······</span><span·class="p"·data-group-id="2221463474-2">[</span><span·class="p"·data-group-id="2221463474-3">{</span><span·class="ss">i</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2221463474-4">[</span><span·class="s">&quot;friend_mibs/&quot;</span><span·cl[·...·truncated·by·diffoscope;·len:·292,·SHA:·103cda2ba70f6abffd0e6d0f944e927a2d985236f9d050dcd644f4da403cc11e·...·]-1">)</span><span·class="p">.</span></code></pre><p>It·is·also·possible·to·import·MIBs·from·OTP·applications·in·an·<code·class="inline">&quot;include_lib&quot;</code>
158 like·fashion·with·the·<code·class="inline">il</code>·option.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="4263230065-1">(</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p">,</span><span·class="w">158 like·fashion·with·the·<code·class="inline">il</code>·option.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmpc</span><span·class="p">:</span><span·class="nf">compile</span><span·class="p"·data-group-id="3717527620-1">(</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p">,</span><span·class="w">
159 ·······</span><span·class="p"·data-group-id="4263230065-2">[</span><span·class="p"·data-group-id="4263230065-3">{</span><span·class="ss">il</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4263230065-4">[</span><span·class="s">&quot;snmp/priv/mibs/&quot;</span><spa[·...·truncated·by·diffoscope;·len:·295,·SHA:·a352a60779fbc4df1612b9a4e9a09fb83d4fde17abcd14b922d3ea36b287b3d9·...·]-1">)</span><span·class="p">.</span></code></pre><p>finds·the·latest·version·of·the·<code·class="inline">snmp</code>·and·<code·class="inline">myapp</code>·applications·in·the·OTP159 ·······</span><span·class="p"·data-group-id="3717527620-2">[</span><span·class="p"·data-group-id="3717527620-3">{</span><span·class="ss">il</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3717527620-4">[</span><span·class="s">&quot;snmp/priv/mibs/&quot;</span><spa[·...·truncated·by·diffoscope;·len:·295,·SHA:·9414b6efd3352922708cdce8b727f55d1626843e4d4481a946553cd554a0c8d7·...·]-1">)</span><span·class="p">.</span></code></pre><p>finds·the·latest·version·of·the·<code·class="inline">snmp</code>·and·<code·class="inline">myapp</code>·applications·in·the·OTP
160 system·and·uses·the·expanded·paths·as·include·paths.</p><p>Note·that·an·SMIv2·MIB·can·import·an·SMIv1·MIB·and·vice·versa.</p><p>The·following·MIBs·are·built-ins·of·the·Erlang·SNMP·compiler:·SNMPv2-SMI,160 system·and·uses·the·expanded·paths·as·include·paths.</p><p>Note·that·an·SMIv2·MIB·can·import·an·SMIv1·MIB·and·vice·versa.</p><p>The·following·MIBs·are·built-ins·of·the·Erlang·SNMP·compiler:·SNMPv2-SMI,
161 RFC-1215,·RFC-1212,·SNMPv2-TC,·SNMPv2-CONF,·and·RFC1155-SMI.·They·cannot161 RFC-1215,·RFC-1212,·SNMPv2-TC,·SNMPv2-CONF,·and·RFC1155-SMI.·They·cannot
162 therefore·be·compiled·separately.</p><h2·id="mib-consistency-checking"·class="section-heading">162 therefore·be·compiled·separately.</p><h2·id="mib-consistency-checking"·class="section-heading">
163 ··<a·href="#mib-consistency-checking"·class="hover-link">163 ··<a·href="#mib-consistency-checking"·class="hover-link">
164 ····<i·class="ri-link-m"·aria-hidden="true"></i>164 ····<i·class="ri-link-m"·aria-hidden="true"></i>
165 ··</a>165 ··</a>
166 ··<span·class="text">MIB·Consistency·Checking</span>166 ··<span·class="text">MIB·Consistency·Checking</span>
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266 ······</p>266 ······</p>
267 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>267 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
268 ····</footer>268 ····</footer>
269 ··</div>269 ··</div>
270 </main>270 </main>
271 </div>271 </div>
272 <script>272 <script>
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274 ····mermaid.initialize({274 ····mermaid.initialize({
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472 ······</p>472 ······</p>
473 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>473 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
474 ····</footer>474 ····</footer>
475 ··</div>475 ··</div>
476 </main>476 </main>
477 </div>477 </div>
478 <script>478 <script>
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130 ····<section·id="moduledoc">130 ····<section·id="moduledoc">
131 <p>Encode·and·Decode·Functions·for·SNMP·PDUs</p><p>RFC1157,·RFC1905·and/or·RFC2272·should·be·studied·carefully·before·using·this131 <p>Encode·and·Decode·Functions·for·SNMP·PDUs</p><p>RFC1157,·RFC1905·and/or·RFC2272·should·be·studied·carefully·before·using·this
132 module,·<code·class="inline">snmp_pdus</code>.</p><p>The·module·<code·class="inline">snmp_pdus</code>·contains·functions·for·encoding·and·decoding·of·SNMP132 module,·<code·class="inline">snmp_pdus</code>.</p><p>The·module·<code·class="inline">snmp_pdus</code>·contains·functions·for·encoding·and·decoding·of·SNMP
133 protocol·data·units·(PDUs).·In·short,·this·module·converts·a·list·of·bytes·to133 protocol·data·units·(PDUs).·In·short,·this·module·converts·a·list·of·bytes·to
134 Erlang·record·representations·and·vice·versa.·The·record·definitions·can·be134 Erlang·record·representations·and·vice·versa.·The·record·definitions·can·be
135 found·in·the·file·<code·class="inline">snmp/include/snmp_types.hrl</code>.·If·snmpv3·is·used,·the·module135 found·in·the·file·<code·class="inline">snmp/include/snmp_types.hrl</code>.·If·snmpv3·is·used,·the·module
136 that·includes·<code·class="inline">snmp_types.hrl</code>·must·define·the·constant·<code·class="inline">SNMP_USE_V3</code>·before·the136 that·includes·<code·class="inline">snmp_types.hrl</code>·must·define·the·constant·<code·class="inline">SNMP_USE_V3</code>·before·the
137 header·file·is·included.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="8609238437-1">(</span><span·class="n">SNMP_USE_V3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="8609238437-1">)</span><span·class="p">.</span><span·class="w">137 header·file·is·included.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="7311977429-1">(</span><span·class="n">SNMP_USE_V3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="7311977429-1">)</span><span·class="p">.</span><span·class="w">
138 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="8609238437-2">(</span><span·class="s">&quot;snmp/include/snmp_types.hrl&quot;</span><span·class="p"·data-group-id="8609238437-2">)</span><span·class="p">.</span></code></pre><p>Encoding·and·decoding·must·be·done·explicitly·when·writing·your·own·Net·if138 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="7311977429-2">(</span><span·class="s">&quot;snmp/include/snmp_types.hrl&quot;</span><span·class="p"·data-group-id="7311977429-2">)</span><span·class="p">.</span></code></pre><p>Encoding·and·decoding·must·be·done·explicitly·when·writing·your·own·Net·if
139 process.</p>139 process.</p>
140 ····</section>140 ····</section>
  
141 </div>141 </div>
  
142 ··<section·id="summary"·class="details-list">142 ··<section·id="summary"·class="details-list">
143 ····<h1·class="section-heading">143 ····<h1·class="section-heading">
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1012 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1012 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1013 ····</footer>1013 ····</footer>
1014 ··</div>1014 ··</div>
1015 </main>1015 </main>
1016 </div>1016 </div>
1017 <script>1017 <script>
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414 ······</p>414 ······</p>
415 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>415 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
416 ····</footer>416 ····</footer>
417 ··</div>417 ··</div>
418 </main>418 </main>
419 </div>419 </div>
420 <script>420 <script>
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791 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>791 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
792 ····</footer>792 ····</footer>
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794 </main>794 </main>
795 </div>795 </div>
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744 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>744 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
745 ····</footer>745 ····</footer>
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747 </main>747 </main>
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1046 ······<p·class="built-using">1046 ······<p·class="built-using">
1047 ········Built·using1047 ········Built·using
1048 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1048 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1049 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1049 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1050 ······</p>1050 ······</p>
1051 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1051 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1052 ····</footer>1052 ····</footer>
1053 ··</div>1053 ··</div>
1054 </main>1054 </main>
1055 </div>1055 </div>
1056 <script>1056 <script>
1057 ··function·mermaidLoaded()·{1057 ··function·mermaidLoaded()·{
1058 ····mermaid.initialize({1058 ····mermaid.initialize({
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./usr/share/doc/erlang-doc/html/lib/snmp-5.18.2/doc/html/snmpa.html
    
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3215 ······················AgentName·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),3215 ······················AgentName·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>(),
3216 ······················Mib·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),3216 ······················Mib·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>(),
3217 ······················Reason·::·already_loaded·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>3217 ······················Reason·::·already_loaded·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
3218 ······</div>3218 ······</div>
  
3219 <p>Load·a·single·<code·class="inline">Mib</code>·into·an·agent.·The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,3219 <p>Load·a·single·<code·class="inline">Mib</code>·into·an·agent.·The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,
3220 including·the·path·to·where·the·compiled·mib·is·found.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="0523199345-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="0523199345-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">3220 including·the·path·to·where·the·compiled·mib·is·found.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="7958578721-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="7958578721-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">
3221 ··········</span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">load_mib</span><span·class="p"·data-group-id="0523199345-2">(</span><span·class="ss">snmp_master_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;MY-MIB&quot;</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·98120734e2606b80230cefdbeb3f4fa39df9b0d87edf1cd6c4aa5ff8a45dc308·...·]-2">)</span><span·class="p">.</span></code></pre>3221 ··········</span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">load_mib</span><span·class="p"·data-group-id="7958578721-2">(</span><span·class="ss">snmp_master_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;MY-MIB&quot;</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·8763b0755826f941125aebef52cee33e99cc37b66d6c7871fe71b69cadeb281b·...·]-2">)</span><span·class="p">.</span></code></pre>
3222 ··</section>3222 ··</section>
3223 </section>3223 </section>
3224 <section·class="detail"·id="load_mibs/1">3224 <section·class="detail"·id="load_mibs/1">
  
3225 ··<div·class="detail-header">3225 ··<div·class="detail-header">
3226 ····<a·href="#load_mibs/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3226 ····<a·href="#load_mibs/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3227 ······<i·class="ri-link-m"·aria-hidden="true"></i>3227 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 3326, 16 lines modifiedOffset 3326, 16 lines modified
3326 ·······················InternalReason·::·already_loaded·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>3326 ·······················InternalReason·::·already_loaded·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
3327 ······</div>3327 ······</div>
  
3328 <p>Load·<code·class="inline">Mibs</code>·into·an·agent.·If·the·agent·cannot·load·all·MIBs·(the·default·value3328 <p>Load·<code·class="inline">Mibs</code>·into·an·agent.·If·the·agent·cannot·load·all·MIBs·(the·default·value
3329 of·the·<code·class="inline">Force</code>·argument·is·<code·class="inline">false</code>),·it·will·indicate·where·loading·was·aborted.3329 of·the·<code·class="inline">Force</code>·argument·is·<code·class="inline">false</code>),·it·will·indicate·where·loading·was·aborted.
3330 The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,·including·the·path·to·where·the·compiled3330 The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,·including·the·path·to·where·the·compiled
3331 mib·is·found.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="1664288474-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="1664288474-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">3331 mib·is·found.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="0523719747-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="0523719747-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">
3332 ··········</span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">load_mibs</span><span·class="p"·data-group-id="1664288474-2">(</span><span·class="ss">snmp_master_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1664288474-3">[</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·142,·SHA:·f5b41f1d9c3ac296b8fdb1cd30902fbf91c7d2eeb399e6015e46a3a051e31735·...·]-2">)</span><span·class="p">.</span></code></pre><p>If·<code·class="inline">Force·=·true</code>·then·the·agent·will·continue·attempting·to·load·each·mib·even3332 ··········</span><span·class="nc">snmpa</span><span·class="p">:</span><span·class="nf">load_mibs</span><span·class="p"·data-group-id="0523719747-2">(</span><span·class="ss">snmp_master_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0523719747-3">[</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·142,·SHA:·b9397f7a74895036f973a55541828a459ed1efd490fafea2b7136cd5fe71a12d·...·]-2">)</span><span·class="p">.</span></code></pre><p>If·<code·class="inline">Force·=·true</code>·then·the·agent·will·continue·attempting·to·load·each·mib·even
3333 after·failing·to·load·a·previous·mib.·Use·with·care.</p>3333 after·failing·to·load·a·previous·mib.·Use·with·care.</p>
3334 ··</section>3334 ··</section>
3335 </section>3335 </section>
3336 <section·class="detail"·id="log_to_io/1">3336 <section·class="detail"·id="log_to_io/1">
  
3337 ··<div·class="detail-header">3337 ··<div·class="detail-header">
3338 ····<a·href="#log_to_io/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3338 ····<a·href="#log_to_io/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 4297, 16 lines modifiedOffset 4297, 16 lines modified
4297 ··········································Mod·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:module/0">module</a>(),4297 ··········································Mod·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:module/0">module</a>(),
4298 ··········································Data·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),4298 ··········································Data·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),
4299 ··········································Where·::·<a·href="#t:nfilter_position/0">nfilter_position</a>(),4299 ··········································Where·::·<a·href="#t:nfilter_position/0">nfilter_position</a>(),
4300 ··········································Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>4300 ··········································Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
4301 ······</div>4301 ······</div>
  
4302 <p>Accepted·type·specifications·are:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">register_notification_filter</span><span·class="p"·data-group-id="5191059131-1">(</span><span·class="n">Agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·443,·SHA:·9421b0b650cd75bd451ef9e075ba8d10b69d5c6ccc785432974b305babd73b55·...·]-2">}</span><span·class="p">.</span><span·class="w">4302 <p>Accepted·type·specifications·are:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">register_notification_filter</span><span·class="p"·data-group-id="4498280193-1">(</span><span·class="n">Agent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·443,·SHA:·ec9d892c160129c27d39fbe691199bd98e9e42490fdc049bfa9900d0c0544c24·...·]-2">}</span><span·class="p">.</span><span·class="w">
4303 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">register_notification_filter</span><span·class="p"·data-group-id="5191059131-3">(</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·443,·SHA:·fb8cdfdc745f9156e45d21131fc27a027efb6d86dabd82a5f6a5df76eb8e8c1a·...·]-4">}</span><span·class="p">.</span></code></pre>4303 </span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">register_notification_filter</span><span·class="p"·data-group-id="4498280193-3">(</span><span·class="n">Id</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mod</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·443,·SHA:·9c035070a0f4a63f1c3cf77e4e4db3c1961719ee842d7ad94988091082d55b60·...·]-4">}</span><span·class="p">.</span></code></pre>
4304 ··</section>4304 ··</section>
4305 </section>4305 </section>
4306 <section·class="detail"·id="register_notification_filter/5">4306 <section·class="detail"·id="register_notification_filter/5">
  
4307 ··<div·class="detail-header">4307 ··<div·class="detail-header">
4308 ····<a·href="#register_notification_filter/5"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">4308 ····<a·href="#register_notification_filter/5"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
4309 ······<i·class="ri-link-m"·aria-hidden="true"></i>4309 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 4367, 16 lines modifiedOffset 4367, 16 lines modified
4367 ·······························SubAgent·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pid/0">pid</a>(),4367 ·······························SubAgent·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pid/0">pid</a>(),
4368 ·······························Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>4368 ·······························Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
4369 ······</div>4369 ······</div>
  
4370 <p>Registers·a·sub-agent·under·a·sub-tree·of·another·agent.</p><p>It·is·easy·to·make·mistakes·when·registering·sub-agents·and·this·activity·should4370 <p>Registers·a·sub-agent·under·a·sub-tree·of·another·agent.</p><p>It·is·easy·to·make·mistakes·when·registering·sub-agents·and·this·activity·should
4371 be·done·carefully.·For·example,·a·strange·behaviour·would·result·from·the4371 be·done·carefully.·For·example,·a·strange·behaviour·would·result·from·the
4372 following·configuration:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmp_agent</span><span·class="p">:</span><span·class="nf">register_subagent</span><span·class="p"·data-group-id="9967930329-1">(</span><span·class="n">MAPid</span><span·class="p">,</span><span·class="p"·data-group-id="9967930329-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="9967930329-2">]</span><span·class="p">,</span><span·class="n">SA1</span><span·class="p"·data-group-id="9967930329-1">)</span><span·class="p">,</span><span·class="w"> 
4373 </span><span·class="nc">snmp_agent</span><span·class="p">:</span><span·class="nf">register_subagent</span><span·class="p"·data-group-id="9967930329-3">(</span><span·class="n">SA1</span><span·class="p">,</span><span·class="p"·data-group-id="9967930329-4">[<[·...·truncated·by·diffoscope;·len:·476,·SHA:·7a3f3981ba4ab58a1dfd3583c6718c0d1b19907796fcf5fd6eef648b6aae02e8·...·]4372 following·configuration:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">snmp_agent</span><span·class="p">:</span><span·class="nf">register_subagent</span><span·class="p"·data-group-id="2246298934-1">(</span><span·class="n">MAPid</span>[·...·truncated·by·diffoscope;·len:·445,·SHA:·789b0246147eb6c24b7b682702bc06ab0095762e0c7e7c65a5ff3358d59f6fe6·...·]
 4373 </span><span·class="nc">snmp_agent</span><span·class="p">:</span><span·class="nf">register_subagent</span><span·class="p"·data-group-id="2246298934-3">(</span><span·class="n">SA1</span><span·class="p">,</span><span·class="p"·data-group-id="2246298934-4">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="2246298934-4">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SA2</span><span·class="p"·data-group-id="2246298934-3">)</span><span·class="p">.</span></code></pre><p><code·class="inline">SA2</code>·will·not·get·requests·starting·with·object·identifier·<code·class="inline">[1,2,3]</code>·since
4374 <code·class="inline">SA1</code>·does·not.</p>4374 <code·class="inline">SA1</code>·does·not.</p>
4375 ··</section>4375 ··</section>
4376 </section>4376 </section>
4377 <section·class="detail"·id="restart_set_worker/0">4377 <section·class="detail"·id="restart_set_worker/0">
  
4378 ··<div·class="detail-header">4378 ··<div·class="detail-header">
4379 ····<a·href="#restart_set_worker/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">4379 ····<a·href="#restart_set_worker/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 4793, 28 lines modifiedOffset 4793, 28 lines modified
4793 function·call·according·to·the·value·of·<code·class="inline">Recv</code>.</li></ul><p>If·<code·class="inline">Receiver</code>·has·the·value·<code·class="inline">{Tag,·Recv}</code>,·the·delivery·is·done·according·to4793 function·call·according·to·the·value·of·<code·class="inline">Recv</code>.</li></ul><p>If·<code·class="inline">Receiver</code>·has·the·value·<code·class="inline">{Tag,·Recv}</code>,·the·delivery·is·done·according·to
4794 <code·class="inline">Recv</code>:</p><ul><li><p><code·class="inline">pid()·|·atom()</code>·-·The·info·will·be·delivered·in·the·following·messages:</p><ul><li><p><code·class="inline">{snmp_targets,·Tag,·Addresses}</code></p><p>This·inform·the·user·which·target·addresses·the·notification·was·sent·to.</p></li><li><p><code·class="inline">{snmp_notification,·Tag,·{got_response,·Address}}</code></p><p>This·informs·the·user·that·this·target·address·acknowledged·the4794 <code·class="inline">Recv</code>:</p><ul><li><p><code·class="inline">pid()·|·atom()</code>·-·The·info·will·be·delivered·in·the·following·messages:</p><ul><li><p><code·class="inline">{snmp_targets,·Tag,·Addresses}</code></p><p>This·inform·the·user·which·target·addresses·the·notification·was·sent·to.</p></li><li><p><code·class="inline">{snmp_notification,·Tag,·{got_response,·Address}}</code></p><p>This·informs·the·user·that·this·target·address·acknowledged·the
4795 notification.</p></li><li><p><code·class="inline">{snmp_notification,·Tag,·{no_response,·Address}}</code></p><p>This·informs·the·user·that·this·target·address·did·not·acknowledge4795 notification.</p></li><li><p><code·class="inline">{snmp_notification,·Tag,·{no_response,·Address}}</code></p><p>This·informs·the·user·that·this·target·address·did·not·acknowledge
4796 notification.</p></li></ul><p>The·notification·is·sent·as·an·Inform-Request·to·each·target·address·in4796 notification.</p></li></ul><p>The·notification·is·sent·as·an·Inform-Request·to·each·target·address·in
4797 <code·class="inline">Addresses</code>·and·if·there·are·no·targets·for·which·an·Inform-Request·is·sent,4797 <code·class="inline">Addresses</code>·and·if·there·are·no·targets·for·which·an·Inform-Request·is·sent,
4798 <code·class="inline">Addresses</code>·is·the·empty·list·<code·class="inline">[]</code>.</p><p>The·<code·class="inline">receiver</code>·will·first·be·sent·the·<code·class="inline">snmp_targets</code>·message,·and·then·for4798 <code·class="inline">Addresses</code>·is·the·empty·list·<code·class="inline">[]</code>.</p><p>The·<code·class="inline">receiver</code>·will·first·be·sent·the·<code·class="inline">snmp_targets</code>·message,·and·then·for
4799 each·address·in·<code·class="inline">Addresses</code>·list,·one·of·the·two·<code·class="inline">snmp_notification</code>·messages.</p></li><li><p><code·class="inline">{Mod,·Func,·Args}</code>·-·The·info·will·be·delivered·via·the·function·call:</p><p><code·class="inline">Mod:Func([Msg·|·Args])</code></p><p>where·<code·class="inline">Msg</code>·has·the·same·content·and·purpose·as·the·messages·descrived·above.</p></li></ul><p><code·class="inline">Address</code>·is·a·management·target·address·and·<code·class="inline">Addresses</code>·is·a·list·of·management4799 each·address·in·<code·class="inline">Addresses</code>·list,·one·of·the·two·<code·class="inline">snmp_notification</code>·messages.</p></li><li><p><code·class="inline">{Mod,·Func,·Args}</code>·-·The·info·will·be·delivered·via·the·function·call:</p><p><code·class="inline">Mod:Func([Msg·|·Args])</code></p><p>where·<code·class="inline">Msg</code>·has·the·same·content·and·purpose·as·the·messages·descrived·above.</p></li></ul><p><code·class="inline">Address</code>·is·a·management·target·address·and·<code·class="inline">Addresses</code>·is·a·list·of·management
4800 target·addresses.·They·are·defined·as·followes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="n">Addresses</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1357313193-1">[</span><span·class="nf">address</span><span·class="p"·data-group-id="1357313193-2">(</span><span·class="p"·data-group-id="1357313193-2">)</span><span·class="p"·data-group-id="1357313193-1">]</span><span·class="w">4800 target·addresses.·They·are·defined·as·followes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">········</span><span·class="n">Addresses</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4120871463-1">[</span><span·class="nf">address</span><span·class="p"·data-group-id="4120871463-2">(</span><span·class="p"·data-group-id="4120871463-2">)</span><span·class="p"·data-group-id="4120871463-1">]</span><span·class="w">
4801 ········</span><span·class="n">Address</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">address</span><span·class="p"·data-group-id="1357313193-3">(</span><span·class="p"·data-group-id="1357313193-3">)</span><span·class="w">4801 ········</span><span·class="n">Address</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">address</span><span·class="p"·data-group-id="4120871463-3">(</span><span·class="p"·data-group-id="4120871463-3">)</span><span·class="w">
4802 ········</span><span·class="nf">address</span><span·class="p"·data-group-id="1357313193-4">(</span><span·class="p"·data-group-id="1357313193-4">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">v1_address</span><span·class="p"·data-group-id="1357313193-5">(</span><span·class="p"·data-group-id="1357313193-5">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">v3_address</span><span·class="p"·data-group-id="1357313193-6">(</span><span·class="p"·data-group-id="1357313193-6">)</span><span·class="w"> 
4803 ········</span><span·class="nf">v1_address</span><span·class="p"·data-group-id="1357313193-7">(</span><span·class="p"·data-group-id="1357313193-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1357313193-8">{</span><span·class="n">TDomain</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TAddress</span><span·class="p"·data-group-id="1357313193-8">}</span><span·class="w"> 
4804 ········</span><span·class="nf">v3_address</span><span·class="p"·data-group-id="1357313193-9">(</span><span·class="p"·data-group-id="1357313193-9">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1357313193-10">{</span><span·c[·...·truncated·by·diffoscope;·len:·337,·SHA:·634c645f02041c38db5d6e9d5cc9425cf80285d870f048fa9631dcb364839b9c·...·]</span><span·class="w">4802 ········</span><span·class="nf">address</span><span·class="p"·data-group-id="4120871463-4">(</span><span·class="p"·data-group-id="4120871463-4">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">v1_address</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·282,·SHA:·efd53731a43c93139cbeba64a98767cc27cb31e39f7d1741c75fc5dd2d5b4b9d·...·]</span><span·class="w">
 4803 ········</span><span·class="nf">v1_address</span><span·class="p"·data-group-id="4120871463-7">(</span><span·class="p"·data-group-id="4120871463-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4120871463-8">{</span><span·class="n">TDomain</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TAddress</span><span·class="p"·data-group-id="4120871463-8">}</span><span·class="w">
 4804 ········</span><span·class="nf">v3_address</span><span·class="p"·data-group-id="4120871463-9">(</span><span·class="p"·data-group-id="4120871463-9">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4120871463-10">{</span><span·class="p"·data-group-id="4120871463-11">{</span><span·class="n">TDomain</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TAddress</span><span·class="p"·data-group-id="4120871463-11">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V3MsgData</span><span·class="p"·data-group-id="4120871463-10">}</span><span·class="w">
4805 ········</span><span·class="n">TDomain</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tdoamin</span><span·class="p"·data-group-id="1357313193-12">(</span><span·class="p"·data-group-id="1357313193-12">)</span><span·class="w">4805 ········</span><span·class="n">TDomain</span><span·class="w">····</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">tdoamin</span><span·class="p"·data-group-id="4120871463-12">(</span><span·class="p"·data-group-id="4120871463-12">)</span><span·class="w">
4806 ········</span><span·class="n">TAddress</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">taddress</span><span·class="p"·data-group-id="1357313193-13">(</span><span·class="p"·data-group-id="1357313193-13">)</span><span·class="w">4806 ········</span><span·class="n">TAddress</span><span·class="w">···</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">taddress</span><span·class="p"·data-group-id="4120871463-13">(</span><span·class="p"·data-group-id="4120871463-13">)</span><span·class="w">
4807 ········</span><span·class="nf">tdomain</span><span·class="p"·data-group-id="1357313193-14">(</span><span·class="p"·data-group-id="1357313193-14">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">oid</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">snmpUDPDomain</span><span·class="w">4807 ········</span><span·class="nf">tdomain</span><span·class="p"·data-group-id="4120871463-14">(</span><span·class="p"·data-group-id="4120871463-14">)</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="n">The</span><span·class="w">·</span><span·class="ss">oid</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">snmpUDPDomain</span><span·class="w">
4808 ·····················</span><span·class="n">This</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">only</span><span·class="w">·</span><span·class="ss">supported</span><span·class="w">·</span><span·class="ss">transport</span><span·class="w">·</span><span·class="ss">domain</span><span·class="p">.</span><span·class="w">4808 ·····················</span><span·class="n">This</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">only</span><span·class="w">·</span><span·class="ss">supported</span><span·class="w">·</span><span·class="ss">transport</span><span·class="w">·</span><span·class="ss">domain</span><span·class="p">.</span><span·class="w">
4809 ········</span><span·class="nf">taddress</span><span·class="p"·data-group-id="1357313193-15">(</span><span·class="p"·data-group-id="1357313193-15">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1357313193-16">[</span><span·class="n">A1</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·377,·SHA:·97df4f5c15bda8fcc59ce3fa2f5776eb4b05974f56d82d6b898fbcb4ddbcfcca·...·]3-16">]</span><span·class="w">4809 ········</span><span·class="nf">taddress</span><span·class="p"·data-group-id="4120871463-15">(</span><span·class="p"·data-group-id="4120871463-15">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4120871463-16">[</span><span·class="n">A1</span><span·class="p">,</span><spa[·...·truncated·by·diffoscope;·len:·377,·SHA:·51fd15cc1438857008f8c48b04cd9186328dc56031347eedda72f72005f6a256·...·]3-16">]</span><span·class="w">
4810 ·····················</span><span·class="n">The</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">·</span><span·class="ss">first</span><span·class="w">·</span><span·class="ss">bytes</span><span·class="w">·</span><span·class="ss">makes</span><span·class="w">·</span><span·class="ss">up</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">IP</span><span·class="o">-</span><span·class="ss">address</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">last</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">4810 ·····················</span><span·class="n">The</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">·</span><span·class="ss">first</span><span·class="w">·</span><span·class="ss">bytes</span><span·class="w">·</span><span·class="ss">makes</span><span·class="w">·</span><span·class="ss">up</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">IP</span><span·class="o">-</span><span·class="ss">address</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">last</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
4811 ·····················</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">UDP</span><span·class="o">-</span><span·class="ss">port</span><span·class="w">·</span><span·class="ss">number</span><span·class="p">.</span><span·class="w">4811 ·····················</span><span·class="ss">the</span><span·class="w">·</span><span·class="n">UDP</span><span·class="o">-</span><span·class="ss">port</span><span·class="w">·</span><span·class="ss">number</span><span·class="p">.</span><span·class="w">
4812 ········</span><span·class="n">V3MsgData</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">v3_msg_data</span><span·class="p"·data-group-id="1357313193-17">(</span><span·class="p"·data-group-id="1357313193-17">)</span><span·class="w">4812 ········</span><span·class="n">V3MsgData</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">v3_msg_data</span><span·class="p"·data-group-id="4120871463-17">(</span><span·class="p"·data-group-id="4120871463-17">)</span><span·class="w">
4813 ········</span><span·class="nf">v3_msg_data</span><span·class="p"·data-group-id="1357313193-18">(</span><span·class="p"·data-group-id="1357313193-18">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="1357313193-19">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·420cc9e89570a5f40737e3c708f4a62d7bf5938bd996ae871111f5e4f99fec84·...·]3-19">)</span></code></pre><p>If·<code·class="inline">Receiver</code>·is·a·<a·href="#t:notification_delivery_info/0"><code·class="inline">notification_delivery_info/0</code></a>·record,·then·the·information4813 ········</span><span·class="nf">v3_msg_data</span><span·class="p"·data-group-id="4120871463-18">(</span><span·class="p"·data-group-id="4120871463-18">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="4120871463-19">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·15,·SHA:·5bbfae2328a61ecb7c4ca41ce3ced730d043ad8309696fa5da0b5d1e9f7ea768·...·]3-19">)</span></code></pre><p>If·<code·class="inline">Receiver</code>·is·a·<a·href="#t:notification_delivery_info/0"><code·class="inline">notification_delivery_info/0</code></a>·record,·then·the·information
4814 about·the·notification·delivery·will·be·delivered·to·the·<code·class="inline">receiver</code>·via·the4814 about·the·notification·delivery·will·be·delivered·to·the·<code·class="inline">receiver</code>·via·the
4815 callback·functions·defined·by·the·<a·href="snmpa_notification_delivery_info_receiver.html"><code·class="inline">snmpa_notification_delivery_info_receiver</code></a>4815 callback·functions·defined·by·the·<a·href="snmpa_notification_delivery_info_receiver.html"><code·class="inline">snmpa_notification_delivery_info_receiver</code></a>
4816 behaviour·according·to·the·content·of·the·<a·href="#t:notification_delivery_info/0"><code·class="inline">notification_delivery_info/0</code></a>4816 behaviour·according·to·the·content·of·the·<a·href="#t:notification_delivery_info/0"><code·class="inline">notification_delivery_info/0</code></a>
4817 record.</p><p>The·optional·argument·<code·class="inline">Varbinds</code>·defines·values·for·the·objects·in·the4817 record.</p><p>The·optional·argument·<code·class="inline">Varbinds</code>·defines·values·for·the·objects·in·the
4818 notification.·If·no·value·is·given·for·an·object,·the·<code·class="inline">Agent</code>·performs·a4818 notification.·If·no·value·is·given·for·an·object,·the·<code·class="inline">Agent</code>·performs·a
4819 get-operation·to·retrieve·the·value.</p><p><code·class="inline">Varbinds</code>·is·a·list·of·<code·class="inline">Varbind</code>,·where·each·<code·class="inline">Varbind</code>·is·one·of:</p><ul><li><code·class="inline">{Variable,·Value}</code>,·where·<code·class="inline">Variable</code>·is·the·symbolic·name·of·a·scalar4819 get-operation·to·retrieve·the·value.</p><p><code·class="inline">Varbinds</code>·is·a·list·of·<code·class="inline">Varbind</code>,·where·each·<code·class="inline">Varbind</code>·is·one·of:</p><ul><li><code·class="inline">{Variable,·Value}</code>,·where·<code·class="inline">Variable</code>·is·the·symbolic·name·of·a·scalar
4820 variable·referred·to·in·the·notification·specification.</li><li><code·class="inline">{Column,·RowIndex,·Value}</code>,·where·<code·class="inline">Column</code>·is·the·symbolic·name·of·a·column4820 variable·referred·to·in·the·notification·specification.</li><li><code·class="inline">{Column,·RowIndex,·Value}</code>,·where·<code·class="inline">Column</code>·is·the·symbolic·name·of·a·column
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402 ········Built·using402 ········Built·using
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404 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>404 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
405 ······</p>405 ······</p>
406 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>406 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
407 ····</footer>407 ····</footer>
408 ··</div>408 ··</div>
409 </main>409 </main>
410 </div>410 </div>
411 <script>411 <script>
412 ··function·mermaidLoaded()·{412 ··function·mermaidLoaded()·{
413 ····mermaid.initialize({413 ····mermaid.initialize({
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127 <p>SNMP·MIB·compiler·frontend</p><h2·id="synopsis"·class="section-heading">127 <p>SNMP·MIB·compiler·frontend</p><h2·id="synopsis"·class="section-heading">
128 ··<a·href="#synopsis"·class="hover-link">128 ··<a·href="#synopsis"·class="hover-link">
129 ····<i·class="ri-link-m"·aria-hidden="true"></i>129 ····<i·class="ri-link-m"·aria-hidden="true"></i>
130 ··</a>130 ··</a>
131 ··<span·class="text">Synopsis</span>131 ··<span·class="text">Synopsis</span>
132 </h2>132 </h2>
133 <pre><code·class="makeup·erlang"·translate="no"><span·class="ss">snmpc</span><span·class="w">·</span><span·class="p"·data-group-id="2242785023-1">[</span><span·class="ss">options</span><span·class="p"·data-group-id="2242785023-1">]</span><span·class="w">·</span><span·class="ss">file</span><span·class="p">.</span><span·class="ss">mib</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">file</span><span·class="p">.</span><span·class="ss">bin</span></code></pre><h2·id="description"·class="section-heading">133 <pre><code·class="makeup·erlang"·translate="no"><span·class="ss">snmpc</span><span·class="w">·</span><span·class="p"·data-group-id="3750030841-1">[</span><span·class="ss">options</span><span·class="p"·data-group-id="3750030841-1">]</span><span·class="w">·</span><span·class="ss">file</span><span·class="p">.</span><span·class="ss">mib</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">file</span><span·class="p">.</span><span·class="ss">bin</span></code></pre><h2·id="description"·class="section-heading">
134 ··<a·href="#description"·class="hover-link">134 ··<a·href="#description"·class="hover-link">
135 ····<i·class="ri-link-m"·aria-hidden="true"></i>135 ····<i·class="ri-link-m"·aria-hidden="true"></i>
136 ··</a>136 ··</a>
137 ··<span·class="text">Description</span>137 ··<span·class="text">Description</span>
138 </h2>138 </h2>
139 <p>The·<code·class="inline">snmpc</code>·program·provides·a·way·to·run·the·SNMP·MIB·compiler·of·the·Erlang139 <p>The·<code·class="inline">snmpc</code>·program·provides·a·way·to·run·the·SNMP·MIB·compiler·of·the·Erlang
140 system.</p><p><code·class="inline">snmpc</code>·compiles·an·SNMP·MIB·file.·See·<a·href="snmpc.html#compile/1">compile/1,2</a>·for·more140 system.</p><p><code·class="inline">snmpc</code>·compiles·an·SNMP·MIB·file.·See·<a·href="snmpc.html#compile/1">compile/1,2</a>·for·more
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212 ········Built·using212 ········Built·using
213 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the213 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
214 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>214 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
215 ······</p>215 ······</p>
216 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>216 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
217 ····</footer>217 ····</footer>
218 ··</div>218 ··</div>
219 </main>219 </main>
220 </div>220 </div>
221 <script>221 <script>
222 ··function·mermaidLoaded()·{222 ··function·mermaidLoaded()·{
223 ····mermaid.initialize({223 ····mermaid.initialize({
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1944 ······<div·class="specs">1944 ······<div·class="specs">
  
1945 ··········<pre·translate="no"><span·class="attribute">-spec</span>·load_mib(MibName)·->·ok·|·{error,·Reason}·when·MibName·::·<a·href="snmp.html#t:mib_name/0">snmp:mib_name</a>(),·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1945 ··········<pre·translate="no"><span·class="attribute">-spec</span>·load_mib(MibName)·->·ok·|·{error,·Reason}·when·MibName·::·<a·href="snmp.html#t:mib_name/0">snmp:mib_name</a>(),·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1946 ······</div>1946 ······</div>
  
1947 <p>Load·a·<code·class="inline">Mib</code>·into·the·manager.·The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,·including1947 <p>Load·a·<code·class="inline">Mib</code>·into·the·manager.·The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,·including
1948 the·path·to·where·the·compiled·mib·is·found.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="0860273362-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="0860273362-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">1948 the·path·to·where·the·compiled·mib·is·found.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="0876231430-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="0876231430-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">
1949 ··········</span><span·class="nc">snmpm</span><span·class="p">:</span><span·class="nf">load_mib</span><span·class="p"·data-group-id="0860273362-2">(</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p"·data-group-id="0860273362-2">)</span><span·class="p">.</span></code></pre>1949 ··········</span><span·class="nc">snmpm</span><span·class="p">:</span><span·class="nf">load_mib</span><span·class="p"·data-group-id="0876231430-2">(</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p"·data-group-id="0876231430-2">)</span><span·class="p">.</span></code></pre>
1950 ··</section>1950 ··</section>
1951 </section>1951 </section>
1952 <section·class="detail"·id="log_to_io/1">1952 <section·class="detail"·id="log_to_io/1">
  
1953 ··<div·class="detail-header">1953 ··<div·class="detail-header">
1954 ····<a·href="#log_to_io/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1954 ····<a·href="#log_to_io/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1955 ······<i·class="ri-link-m"·aria-hidden="true"></i>1955 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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3450 ······<div·class="specs">3450 ······<div·class="specs">
  
3451 ··········<pre·translate="no"><span·class="attribute">-spec</span>·unload_mib(MibName)·->·ok·|·{error,·Reason}·when·MibName·::·<a·href="snmp.html#t:mib_name/0">snmp:mib_name</a>(),·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>3451 ··········<pre·translate="no"><span·class="attribute">-spec</span>·unload_mib(MibName)·->·ok·|·{error,·Reason}·when·MibName·::·<a·href="snmp.html#t:mib_name/0">snmp:mib_name</a>(),·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
3452 ······</div>3452 ······</div>
  
3453 <p>Unload·a·<code·class="inline">Mib</code>·from·the·manager.·The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,·including3453 <p>Unload·a·<code·class="inline">Mib</code>·from·the·manager.·The·<code·class="inline">MibName</code>·is·the·name·of·the·Mib,·including
3454 the·path·to·where·the·compiled·mib·is·found.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="8167980526-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="8167980526-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">3454 the·path·to·where·the·compiled·mib·is·found.·For·example,</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··········</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">priv_dir</span><span·class="p"·data-group-id="1581911369-1">(</span><span·class="ss">my_app</span><span·class="p"·data-group-id="1581911369-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;/mibs/&quot;</span><span·class="p">,</span><span·class="w">
3455 ··········</span><span·class="nc">snmpm</span><span·class="p">:</span><span·class="nf">unload_mib</span><span·class="p"·data-group-id="8167980526-2">(</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p"·data-group-id="8167980526-2">)</span><span·class="p">.</span></code></pre>3455 ··········</span><span·class="nc">snmpm</span><span·class="p">:</span><span·class="nf">unload_mib</span><span·class="p"·data-group-id="1581911369-2">(</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;MY-MIB&quot;</span><span·class="p"·data-group-id="1581911369-2">)</span><span·class="p">.</span></code></pre>
3456 ··</section>3456 ··</section>
3457 </section>3457 </section>
3458 <section·class="detail"·id="unregister_agent/2">3458 <section·class="detail"·id="unregister_agent/2">
  
3459 ··<div·class="detail-header">3459 ··<div·class="detail-header">
3460 ····<a·href="#unregister_agent/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">3460 ····<a·href="#unregister_agent/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
3461 ······<i·class="ri-link-m"·aria-hidden="true"></i>3461 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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3892 ········Built·using3892 ········Built·using
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3895 ······</p>3895 ······</p>
3896 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3896 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
3897 ····</footer>3897 ····</footer>
3898 ··</div>3898 ··</div>
3899 </main>3899 </main>
3900 </div>3900 </div>
3901 <script>3901 <script>
3902 ··function·mermaidLoaded()·{3902 ··function·mermaidLoaded()·{
3903 ····mermaid.initialize({3903 ····mermaid.initialize({
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1312 ······</p>1312 ······</p>
1313 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1313 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1314 ····</footer>1314 ····</footer>
1315 ··</div>1315 ··</div>
1316 </main>1316 </main>
1317 </div>1317 </div>
1318 <script>1318 <script>
1319 ··function·mermaidLoaded()·{1319 ··function·mermaidLoaded()·{
1320 ····mermaid.initialize({1320 ····mermaid.initialize({
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627 ······</p>627 ······</p>
628 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>628 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
629 ····</footer>629 ····</footer>
630 ··</div>630 ··</div>
631 </main>631 </main>
632 </div>632 </div>
633 <script>633 <script>
634 ··function·mermaidLoaded()·{634 ··function·mermaidLoaded()·{
635 ····mermaid.initialize({635 ····mermaid.initialize({
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556 ······</p>556 ······</p>
557 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>557 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
558 ····</footer>558 ····</footer>
559 ··</div>559 ··</div>
560 </main>560 </main>
561 </div>561 </div>
562 <script>562 <script>
563 ··function·mermaidLoaded()·{563 ··function·mermaidLoaded()·{
564 ····mermaid.initialize({564 ····mermaid.initialize({
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482 ······</p>482 ······</p>
483 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>483 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
484 ····</footer>484 ····</footer>
485 ··</div>485 ··</div>
486 </main>486 </main>
487 </div>487 </div>
488 <script>488 <script>
489 ··function·mermaidLoaded()·{489 ··function·mermaidLoaded()·{
490 ····mermaid.initialize({490 ····mermaid.initialize({
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698 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>698 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
699 ····</footer>699 ····</footer>
700 ··</div>700 ··</div>
701 </main>701 </main>
702 </div>702 </div>
703 <script>703 <script>
704 ··function·mermaidLoaded()·{704 ··function·mermaidLoaded()·{
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144 ········Built·using144 ········Built·using
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146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
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276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
277 ······</p>277 ······</p>
278 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>278 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
279 ····</footer>279 ····</footer>
280 ··</div>280 ··</div>
281 </main>281 </main>
282 </div>282 </div>
283 <script>283 <script>
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138 the·<a·href="configure_algos.html">Configuring·algorithms·in·SSH</a>·chapter.</p><h2·id="options-configuration"·class="section-heading">138 the·<a·href="configure_algos.html">Configuring·algorithms·in·SSH</a>·chapter.</p><h2·id="options-configuration"·class="section-heading">
139 ··<a·href="#options-configuration"·class="hover-link">139 ··<a·href="#options-configuration"·class="hover-link">
140 ····<i·class="ri-link-m"·aria-hidden="true"></i>140 ····<i·class="ri-link-m"·aria-hidden="true"></i>
141 ··</a>141 ··</a>
142 ··<span·class="text">Options·configuration</span>142 ··<span·class="text">Options·configuration</span>
143 </h2>143 </h2>
144 <p>There·are·from·OTP-23.0·two·main·ways·to·set·an·option:</p><ul><li><p>Like·before,·in·the·<code·class="inline">Options</code>·parameter·in·the·Erlang·code·in·a·call·to·for144 <p>There·are·from·OTP-23.0·two·main·ways·to·set·an·option:</p><ul><li><p>Like·before,·in·the·<code·class="inline">Options</code>·parameter·in·the·Erlang·code·in·a·call·to·for
145 example·<a·href="ssh.html#daemon/3"><code·class="inline">ssh:daemon/3</code></a>·or·<a·href="ssh.html#connect/3"><code·class="inline">ssh:connect/3</code></a>·or·any·of·their·variants.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="5556477632-1">(</span><span·class="mi">22</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5556477632-2">[</span><span·class="p"·data-group-id="5556477632-3">{</span><span·class="ss">user</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·625,·SHA:·70ccf9e3f8b0a55a2952510708044c8324b4f38139cce8ace3aadbe6ec91f152·...·]-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">145 example·<a·href="ssh.html#daemon/3"><code·class="inline">ssh:daemon/3</code></a>·or·<a·href="ssh.html#connect/3"><code·class="inline">ssh:connect/3</code></a>·or·any·of·their·variants.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="1813567582-1">(</span><span·class="mi">22</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1813567582-2">[</span><span·class="p"·data-group-id="1813567582-3">{</span><span·class="ss">user</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·625,·SHA:·ab835d43a26d2ecd5134a1b8151751abc50c2f2025b2ddf265f59738a077609b·...·]-1">{</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">
146 ·</span><span·class="p"·data-group-id="4272565754-2">[</span><span·class="p"·data-group-id="4272565754-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SSH-2·for·Erlang/OTP&quot;</span><span·class="p"·data-group-id="4272565754-3">}</span><span·class="p">,</span><span·class="w">146 ·</span><span·class="p"·data-group-id="5908657242-2">[</span><span·class="p"·data-group-id="5908657242-3">{</span><span·class="ss">description</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;SSH-2·for·Erlang/OTP&quot;</span><span·class="p"·data-group-id="5908657242-3">}</span><span·class="p">,</span><span·class="w">
147 ··</span><span·class="p"·data-group-id="4272565754-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.9&quot;</span><span·class="p"·data-group-id="4272565754-4">}</span><span·class="p">,</span><span·class="w">147 ··</span><span·class="p"·data-group-id="5908657242-4">{</span><span·class="ss">vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.9&quot;</span><span·class="p"·data-group-id="5908657242-4">}</span><span·class="p">,</span><span·class="w">
148 ··</span><span·class="p"·data-group-id="4272565754-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4272565754-6">[</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">148 ··</span><span·class="p"·data-group-id="5908657242-5">{</span><span·class="ss">modules</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5908657242-6">[</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">
149 ········</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">149 ········</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
150 ·········</span><span·class="ss">ssh_xfer</span><span·class="p"·data-group-id="4272565754-6">]</span><span·class="p"·data-group-id="4272565754-5">}</span><span·class="p">,</span><span·class="w">150 ·········</span><span·class="ss">ssh_xfer</span><span·class="p"·data-group-id="5908657242-6">]</span><span·class="p"·data-group-id="5908657242-5">}</span><span·class="p">,</span><span·class="w">
151 ··</span><span·class="p"·data-group-id="4272565754-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4272565754-8">[</span><span·class="p"·data-group-id="4272565754-8">]</span><span·class="p"·data-group-id="4272565754-7">}</span><span·class="p">,</span><span·class="w">151 ··</span><span·class="p"·data-group-id="5908657242-7">{</span><span·class="ss">registered</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5908657242-8">[</span><span·class="p"·data-group-id="5908657242-8">]</span><span·class="p"·data-group-id="5908657242-7">}</span><span·class="p">,</span><span·class="w">
152 ··</span><span·class="p"·data-group-id="4272565754-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4272565754-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·267,·SHA:·3f61cc63b7857c96abd933cc1a95b60edbcc471c69c76ed9dc5c2d4c19146800·...·]-9">}</span><span·class="p">,</span><span·class="w">152 ··</span><span·class="p"·data-group-id="5908657242-9">{</span><span·class="ss">applications</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5908657242-10">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">s[·...·truncated·by·diffoscope;·len:·267,·SHA:·1cbef89664587d5647b8fd5e031dfcf013a05cfbc097375194482f036782d5e0·...·]-9">}</span><span·class="p">,</span><span·class="w">
153 ··</span><span·class="p"·data-group-id="4272565754-11">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4272565754-12">[</span><span·class="p"·data-group-id="4272565754-13">{</span><span·class="ss">user</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·129,·SHA:·9fd050b77e4bcbf5772ec2e5c6103044a06f7aef17a81ca5766e58aa515be987·...·]-13">}</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;·HERE</span><span·class="w">153 ··</span><span·class="p"·data-group-id="5908657242-11">{</span><span·class="ss">env</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5908657242-12">[</span><span·class="p"·data-group-id="5908657242-13">{</span><span·class="ss">user</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·129,·SHA:·fe066e4fa0a8a483800ae4774a41fc73e7bdb839b2d4bbe0f6f49bbdfd4493ec·...·]-13">}</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;·HERE</span><span·class="w">
154 ··</span><span·class="p"·data-group-id="4272565754-14">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4272565754-15">{</span><span·class="ss">ssh_app</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·178,·SHA:·51dbe96f2bb81acd14ac0587928e11a311e3263cd7f10df18c4c637c835d36d7·...·]-14">}</span><span·class="p">,</span><span·class="w">154 ··</span><span·class="p"·data-group-id="5908657242-14">{</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5908657242-15">{</span><span·class="ss">ssh_app</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·178,·SHA:·b4e3ca2ea758183fcb0cb3b71d21b4983f03f4c5dadd8df286afe7dff6a9efbe·...·]-14">}</span><span·class="p">,</span><span·class="w">
155 ·······</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre></li><li><p>In·a·.config·file:</p><pre><code·class="text">erl·-config·ex1</code></pre><p>where·<code·class="inline">ex1.config</code>·contains:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6064998300-1">[</span><span·class="w">155 ·······</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre></li><li><p>In·a·.config·file:</p><pre><code·class="text">erl·-config·ex1</code></pre><p>where·<code·class="inline">ex1.config</code>·contains:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3739456096-1">[</span><span·class="w">
156 </span><span·class="p"·data-group-id="6064998300-2">{</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6064998300-3">[</span><span·class="p"·data-group-id="6064998300-4">{</span><span·class="ss">user</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·208,·SHA:·8e5151a366d8a20a2399aed7b0ec4b25ff64bde24cefdd6a4806f847a971fdc1·...·]-2">}</span><span·class="w">156 </span><span·class="p"·data-group-id="3739456096-2">{</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3739456096-3">[</span><span·class="p"·data-group-id="3739456096-4">{</span><span·class="ss">user</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·208,·SHA:·0ff30cdf62782b7a1eb8e0c35cc451922c115accc89fc05269b51dbf92e27c7c·...·]-2">}</span><span·class="w">
157 </span><span·class="p"·data-group-id="6064998300-1">]</span><span·class="p">.</span></code></pre></li></ul><p>If·the·option·is·intended·only·for·a·server·or·for·a·client,·it·may·be·set·in157 </span><span·class="p"·data-group-id="3739456096-1">]</span><span·class="p">.</span></code></pre></li></ul><p>If·the·option·is·intended·only·for·a·server·or·for·a·client,·it·may·be·set·in
158 this·way:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0455610167-1">[</span><span·class="w">158 this·way:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1957363103-1">[</span><span·class="w">
159 </span><span·class="p"·data-group-id="0455610167-2">{</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0455610167-3">[</span><span·class="p"·data-group-id="0455610167-4">{</span><span·class="ss">server_options</span><span·class="p">,</span><span·class="p"·data-group-id="0455610167-5">[</span><span·class="p"·data-group-id="0455610167-6">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="0455610167-6">}</span><span·class="p"·data-group-id="0455610167-5">]</span><span·class="p"·data-group-id="0455610167-4">}</span><span·class="p">,</span><span·class="w"> 
160 ·······</span><span·class="p"·data-group-id="0455610167-7">{</span><span·class="ss">client_options</span><span·class="p">,</span><span·class="p"·data-group-id="0455610167-8">[</span><span·class="p"·data-group-id="0455610167-9">{</span><span·class="ss">user[·...·truncated·by·diffoscope;·len:·245,·SHA:·382e3ac07bbabfe68d8f98f02b12b26d99918c3fd8c60a0fc2851d5967fd795f·...·]</span><span·class="w">159 </span><span·class="p"·data-group-id="1957363103-2">{</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1957363103-3">[</span><span·class="p"·data-group-id="1957363103-4">{</span><span·class="ss[·...·truncated·by·diffoscope;·len:·443,·SHA:·de9e55ef8c9f6107aee445b3fdba17d0499ad996c94500288feb7d00f5918fe8·...·]</span><span·class="w">
 160 ·······</span><span·class="p"·data-group-id="1957363103-7">{</span><span·class="ss">client_options</span><span·class="p">,</span><span·class="p"·data-group-id="1957363103-8">[</span><span·class="p"·data-group-id="1957363103-9">{</span><span·class="ss">user</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="1957363103-9">}</span><span·class="p"·data-group-id="1957363103-8">]</span><span·class="p"·data-group-id="1957363103-7">}</span><span·class="w">
161 </span><span·class="p"·data-group-id="0455610167-3">]</span><span·class="p">.</span></code></pre><p>A·server·(daemon)·will·use·the·user·name·<code·class="inline">foo</code>,·and·a·client·will·use·the·name161 </span><span·class="p"·data-group-id="1957363103-3">]</span><span·class="p">.</span></code></pre><p>A·server·(daemon)·will·use·the·user·name·<code·class="inline">foo</code>,·and·a·client·will·use·the·name
162 <code·class="inline">bar</code>.</p></li></ul><h2·id="precedence"·class="section-heading">162 <code·class="inline">bar</code>.</p></li></ul><h2·id="precedence"·class="section-heading">
163 ··<a·href="#precedence"·class="hover-link">163 ··<a·href="#precedence"·class="hover-link">
164 ····<i·class="ri-link-m"·aria-hidden="true"></i>164 ····<i·class="ri-link-m"·aria-hidden="true"></i>
165 ··</a>165 ··</a>
166 ··<span·class="text">Precedence</span>166 ··<span·class="text">Precedence</span>
167 </h2>167 </h2>
168 <p>If·an·option·is·set·in·more·than·one·way,·what·happens?</p><p>There·is·an·ordering,·which·is:</p><ul><li>Level·0:·Hard-coded·default·values·in·the·OTP·SSH·source·code</li><li>Level·1:·<a·href="../../../../lib/kernel-10.2.6/doc/html/config.html">OTP·Configuration·Parameters</a></li><li>Level·2:·Options·in·the·<a·href="../../../../lib/kernel-10.2.6/doc/html/config.html">OTP·Configuration·Parameters</a>168 <p>If·an·option·is·set·in·more·than·one·way,·what·happens?</p><p>There·is·an·ordering,·which·is:</p><ul><li>Level·0:·Hard-coded·default·values·in·the·OTP·SSH·source·code</li><li>Level·1:·<a·href="../../../../lib/kernel-10.2.6/doc/html/config.html">OTP·Configuration·Parameters</a></li><li>Level·2:·Options·in·the·<a·href="../../../../lib/kernel-10.2.6/doc/html/config.html">OTP·Configuration·Parameters</a>
Offset 225, 96 lines modifiedOffset 225, 96 lines modified
225 ··························'aes192-cbc','aes128-cbc','3des-cbc']}]},225 ··························'aes192-cbc','aes128-cbc','3des-cbc']}]},
226 ·{mac,[{client2server,['hmac-sha2-256','hmac-sha2-512',226 ·{mac,[{client2server,['hmac-sha2-256','hmac-sha2-512',
227 ·······················'hmac-sha1']},227 ·······················'hmac-sha1']},
228 ·······{server2client,['hmac-sha2-256','hmac-sha2-512',228 ·······{server2client,['hmac-sha2-256','hmac-sha2-512',
229 ·······················'hmac-sha1']}]},229 ·······················'hmac-sha1']}]},
230 ·{compression,[{client2server,[none,'zlib@openssh.com',zlib]},230 ·{compression,[{client2server,[none,'zlib@openssh.com',zlib]},
231 ···············{server2client,[none,'zlib@openssh.com',zlib]}]}]</code></pre><p>Note·that·the·algorithms·in·the·file·<code·class="inline">ex2.config</code>·is·not·yet·applied.·They·will231 ···············{server2client,[none,'zlib@openssh.com',zlib]}]}]</code></pre><p>Note·that·the·algorithms·in·the·file·<code·class="inline">ex2.config</code>·is·not·yet·applied.·They·will
232 be·when·we·start·ssh:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="4618455315-1">(</span><span·class="p"·data-group-id="4618455315-1">)</span><span·class="p">.</span><span·class="w">232 be·when·we·start·ssh:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8066505588-1">(</span><span·class="p"·data-group-id="8066505588-1">)</span><span·class="p">.</span><span·class="w">
233 </span><span·class="ss">ok</span><span·class="gp·unselectable">233 </span><span·class="ss">ok</span><span·class="gp·unselectable">
234 3&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">default_algorithms</span><span·class="p"·data-group-id="4618455315-2">(</span><span·class="p"·data-group-id="4618455315-2">)</span><span·class="p">.</span><span·class="w">234 3&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">default_algorithms</span><span·class="p"·data-group-id="8066505588-2">(</span><span·class="p"·data-group-id="8066505588-2">)</span><span·class="p">.</span><span·class="w">
235 </span><span·class="p"·data-group-id="4618455315-3">[</span><span·class="p"·data-group-id="4618455315-4">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-5">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·69,·SHA:·53c36d508b443375b01fe54ce6d235bd06041f259caa03b289c0d8fe14a7a751·...·]-4">}</span><span·class="p">,</span><span·class="w">235 </span><span·class="p"·data-group-id="8066505588-3">[</span><span·class="p"·data-group-id="8066505588-4">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-5">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·69,·SHA:·cfdb1f0b46ddf40060954f39b524cc83b362d4a0b37ab76a3bdb1dc8d876fb35·...·]-4">}</span><span·class="p">,</span><span·class="w">
236 ·</span><span·class="p"·data-group-id="4618455315-6">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-7">[</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p"·data-group-id="4618455315-7">]</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·2968e7ee9c0933d3cf225ce84dee2fa9b62d93a85e6af514742d37ab4a076ab9·...·]-6">}</span><span·class="p">,</span><span·class="w">236 ·</span><span·class="p"·data-group-id="8066505588-6">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-7">[</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p"·data-group-id="8066505588-7">]</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·4cadf41484949960887621497ade27cd95b65bc07de47ec5dd435dafb32a8304·...·]-6">}</span><span·class="p">,</span><span·class="w">
237 ·</span><span·class="p"·data-group-id="4618455315-8">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-9">[</span><span·class="p"·data-group-id="4618455315-10">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·181,·SHA:·bdf374095b11220909c17680506eef49e8d0d45fb816dce904a818140b7e6e52·...·]-10">}</span><span·class="p">,</span><span·class="w">237 ·</span><span·class="p"·data-group-id="8066505588-8">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-9">[</span><span·class="p"·data-group-id="8066505588-10">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class=[·...·truncated·by·diffoscope;·len:·181,·SHA:·4937136f36b16e26713d9837b59e686c005fac556e18a5f354936e39aa48219f·...·]-10">}</span><span·class="p">,</span><span·class="w">
238 ··········</span><span·class="p"·data-group-id="4618455315-12">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-13">[</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p"·data-group-id="4618455315-13">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·128,·SHA:·e7ab585ece5e7cd7be172b94c98567cb49d651caf1fc868ae38491021f4a19fd·...·]-8">}</span><span·class="p">,</span><span·class="w">238 ··········</span><span·class="p"·data-group-id="8066505588-12">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-13">[</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p"·data-group-id="8066505588-13">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·128,·SHA:·ae8ecdee271012558c7fd815f3512472211d861168f51412f4c65150dcc5aa14·...·]-8">}</span><span·class="p">,</span><span·class="w">
239 ·</span><span·class="p"·data-group-id="4618455315-14">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-15">[</span><span·class="p"·data-group-id="4618455315-16">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·179,·SHA:·77bc61ba39e74db09a6382e9236b0bd63013e1b6d46e98bfa0872e9bf3f8f960·...·]-16">}</span><span·class="p">,</span><span·class="w">239 ·</span><span·class="p"·data-group-id="8066505588-14">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-15">[</span><span·class="p"·data-group-id="8066505588-16">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·179,·SHA:·67040e457f9486c63c0ff203eb11c3fda1cafebcba14d6b8e935bc8b04ce0a6e·...·]-16">}</span><span·class="p">,</span><span·class="w">
240 ·······</span><span·class="p"·data-group-id="4618455315-18">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-19">[</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="4618455315-19">]</span><span·class="p"·data-group-id="4618455315-18">}</span><span·class="p"·data-group-id="4618455315-15">]</span><span·class="p"·data-group-id="4618455315-14">}</span><span·class="p">,</span><span·class="w"> 
241 ·</span><span·class="p"·data-group-id="4618455315-20">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-21">[</span><span·class="p"·data-group-id="4618455315-22">{</span><span·class="ss">client2serv[·...·truncated·by·diffoscope;·len:·339,·SHA:·1a74d8c3a7ad7438a2b8e1e166910ff073adab7a0f943b5e73fd21a51c710361·...·]">}</span><span·class="p">,</span><span·class="w">240 ·······</span><span·class="p"·data-group-id="8066505588-18">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-19">[</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·175,·SHA:·7c7ad97b243eb861df281f0ef9ff88dfdebcaa15d8e8dca364b5002aa1206904·...·]">}</span><span·class="p">,</span><span·class="w">
 241 ·</span><span·class="p"·data-group-id="8066505588-20">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-21">[</span><span·class="p"·data-group-id="8066505588-22">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-23">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="8066505588-23">]</span><span·class="p"·data-group-id="8066505588-22">}</span><span·class="p">,</span><span·class="w">
242 ···············</span><span·class="p"·data-group-id="4618455315-24">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="4618455315-25">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">[·...·truncated·by·diffoscope;·len:·293,·SHA:·e605d4b325a2ddc30b4d112944578f14a7f35183d2992cb001f6660e8c92569d·...·]-3">]</span><span·class="w">242 ···············</span><span·class="p"·data-group-id="8066505588-24">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="8066505588-25">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">[·...·truncated·by·diffoscope;·len:·293,·SHA:·399f17bde800388a1cff49338ab06229007de329c4917d87f2fb862cf982464c·...·]-3">]</span><span·class="w">
243 </span><span·class="mi">4</span><span·class="o">&gt;</span></code></pre><p>We·see·that·the·algorithm·set·is·changed·to·the·one·in·the·<code·class="inline">ex2.config</code>.·Since243 </span><span·class="mi">4</span><span·class="o">&gt;</span></code></pre><p>We·see·that·the·algorithm·set·is·changed·to·the·one·in·the·<code·class="inline">ex2.config</code>.·Since
244 <code·class="inline">compression</code>·is·not·specified·in·the·file,·the·hard-coded·default·is·still·used244 <code·class="inline">compression</code>·is·not·specified·in·the·file,·the·hard-coded·default·is·still·used
245 for·that·entry.</p><h4>Establishing·a·connection·(ssh:connect·et·al)·or·starting·a·daemon·(ssh:daemon)</h4><p>Both·when·the·client·establishes·a·connection·with·ssh:connect·or·other245 for·that·entry.</p><h4>Establishing·a·connection·(ssh:connect·et·al)·or·starting·a·daemon·(ssh:daemon)</h4><p>Both·when·the·client·establishes·a·connection·with·ssh:connect·or·other
246 functions,·or·a·daemon·is·started·with·ssh:daemon,·the·option·lists·in·the246 functions,·or·a·daemon·is·started·with·ssh:daemon,·the·option·lists·in·the
247 function·calls·are·also·used.</p><p>If·a·client·is·started·(ssh:connect·et·al),·the·environment·variable247 function·calls·are·also·used.</p><p>If·a·client·is·started·(ssh:connect·et·al),·the·environment·variable
248 <code·class="inline">client_options</code>·is·used.·Similarly·for·a·daemon·the·<code·class="inline">server_options</code>·variable248 <code·class="inline">client_options</code>·is·used.·Similarly·for·a·daemon·the·<code·class="inline">server_options</code>·variable
249 is·handled.</p><p>If·any·<a·href="ssh.html#t:preferred_algorithms_common_option/0">preferred_algorithms</a>·is249 is·handled.</p><p>If·any·<a·href="ssh.html#t:preferred_algorithms_common_option/0">preferred_algorithms</a>·is
250 present,·the·one·with·the·highest·level·is·used,·that·is,·the·<code·class="inline">Option</code>·list250 present,·the·one·with·the·highest·level·is·used,·that·is,·the·<code·class="inline">Option</code>·list
251 parameter·has·the·highest·priority.·Then·the251 parameter·has·the·highest·priority.·Then·the
252 <a·href="ssh.html#t:modify_algorithms_common_option/0">modify_algorithms</a>·on·all·levels·in252 <a·href="ssh.html#t:modify_algorithms_common_option/0">modify_algorithms</a>·on·all·levels·in
253 order·starting·with·level·0·are·applied.</p><p>We·continue·the·example·above·by·connecting·to·a·server·and·modifying·the·<code·class="inline">kex</code>253 order·starting·with·level·0·are·applied.</p><p>We·continue·the·example·above·by·connecting·to·a·server·and·modifying·the·<code·class="inline">kex</code>
254 algorithm·set.·We·remove·the·only·one·(<code·class="inline">'ecdh-sha2-nistp384'</code>)·and·add254 algorithm·set.·We·remove·the·only·one·(<code·class="inline">'ecdh-sha2-nistp384'</code>)·and·add
255 <code·class="inline">'curve25519-sha256@libssh.org'</code>·by·appending·it·to·the·now·empty·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="p"·data-group-id="6640734446-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="6640734446-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ssh</span><span·cl[·...·truncated·by·diffoscope;·len:·88,·SHA:·f615f80a51a190c7dc6552efdeeb6a0045e9f1fed30117a8967088f1e4dd02da·...·]-2">(</span><span·class="ss">loopback</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">22</span><span·class="p">,</span><span·class="w">255 <code·class="inline">'curve25519-sha256@libssh.org'</code>·by·appending·it·to·the·now·empty·list:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="p"·data-group-id="0442362725-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="0442362725-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ssh</span><span·cl[·...·truncated·by·diffoscope;·len:·88,·SHA:·fd5782d9c60841162a6519fac8d63debe9fd0e3101891751853ba3218d23865d·...·]-2">(</span><span·class="ss">loopback</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">22</span><span·class="p">,</span><span·class="w">
256 ························</span><span·class="p"·data-group-id="6640734446-3">[</span><span·class="p"·data-group-id="6640734446-4">{</span><span·class="ss">modify_algorithms</span><span·class="p">,</span><span·class="w">256 ························</span><span·class="p"·data-group-id="0442362725-3">[</span><span·class="p"·data-group-id="0442362725-4">{</span><span·class="ss">modify_algorithms</span><span·class="p">,</span><span·class="w">
257 ·································</span><span·class="p"·data-group-id="6640734446-5">[</span><span·class="p"·data-group-id="6640734446-6">{</span><span·class="ss">rm</span><span·class="p">,</span><span·class="w">257 ·································</span><span·class="p"·data-group-id="0442362725-5">[</span><span·class="p"·data-group-id="0442362725-6">{</span><span·class="ss">rm</span><span·class="p">,</span><span·class="w">
258 ·····································</span><span·class="p"·data-group-id="6640734446-7">[</span><span·class="w">·</span><span·class="p"·data-group-id="6640734446-8">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="6640734446-9">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><[·...·truncated·by·diffoscope;·len:·170,·SHA:·c62d8eeb1df2c34243388683772b63240a7c4cb451844f91c5184ae10df2c04e·...·]-7">]</span><span·class="w">258 ·····································</span><span·class="p"·data-group-id="0442362725-7">[</span><span·class="w">·</span><span·class="p"·data-group-id="0442362725-8">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="0442362725-9">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><[·...·truncated·by·diffoscope;·len:·170,·SHA:·93801876338b7b3c27e7d5a695032ae750d112c55e2b45b8de484689d2a70fc9·...·]-7">]</span><span·class="w">
259 »       »       »       »       ··</span><span·class="p"·data-group-id="6640734446-6">}</span><span·class="p">,</span><span·class="w">259 »       »       »       »       ··</span><span·class="p"·data-group-id="0442362725-6">}</span><span·class="p">,</span><span·class="w">
260 ··································</span><span·class="p"·data-group-id="6640734446-10">{</span><span·class="ss">append</span><span·class="p">,</span><span·class="w">260 ··································</span><span·class="p"·data-group-id="0442362725-10">{</span><span·class="ss">append</span><span·class="p">,</span><span·class="w">
261 »       »       »       ·············</span><span·class="p"·data-group-id="6640734446-11">[</span><span·class="w">·</span><span·class="p"·data-group-id="6640734446-12">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="6640734446-13">[</span><span·class="ss">&#39;curve25519-sha256@libssh.org[·...·truncated·by·diffoscope;·len:·185,·SHA:·0e47902ef0a5758e4e528725af10d4f95c9a4d63b3a62c44f2d4a4eaf3ccfdad·...·]-11">]</span><span·class="w">261 »       »       »       ·············</span><span·class="p"·data-group-id="0442362725-11">[</span><span·class="w">·</span><span·class="p"·data-group-id="0442362725-12">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="0442362725-13">[</span><span·class="ss">&#39;curve25519-sha256@libssh.org[·...·truncated·by·diffoscope;·len:·185,·SHA:·67b6846245ac5a357a46a1750b7695f2f8753340e7b17b2be282b7226b0f1ce3·...·]-11">]</span><span·class="w">
262 »       »       »       »       ··</span><span·class="p"·data-group-id="6640734446-10">}</span><span·class="w">262 »       »       »       »       ··</span><span·class="p"·data-group-id="0442362725-10">}</span><span·class="w">
263 »       »       »       »       ·</span><span·class="p"·data-group-id="6640734446-5">]</span><span·class="w">263 »       »       »       »       ·</span><span·class="p"·data-group-id="0442362725-5">]</span><span·class="w">
264 »       ·················</span><span·class="p"·data-group-id="6640734446-4">}</span><span·class="w">264 »       ·················</span><span·class="p"·data-group-id="0442362725-4">}</span><span·class="w">
265 ························</span><span·class="p"·data-group-id="6640734446-3">]</span><span·class="p"·data-group-id="6640734446-2">)</span><span·class="p">.</span><span·class="w">265 ························</span><span·class="p"·data-group-id="0442362725-3">]</span><span·class="p"·data-group-id="0442362725-2">)</span><span·class="p">.</span><span·class="w">
266 </span><span·class="p"·data-group-id="6640734446-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&gt;</span><span·class="mf">0.118</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="6640734446-14">}</span></code></pre><p>We·check·which·algorithms·are·negotiated·by·the·client·and·the·server,·and·note266 </span><span·class="p"·data-group-id="0442362725-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&gt;</span><span·class="mf">0.118</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0442362725-14">}</span></code></pre><p>We·check·which·algorithms·are·negotiated·by·the·client·and·the·server,·and·note
267 that·the·(only)·<code·class="inline">kex</code>·algorithm·<code·class="inline">'curve25519-sha256@libssh.org'</code>·was·selected:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">connection_info</span><span·class="p"·data-group-id="2420014095-1">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">algorithms</span><span·class="p"·data-group-id="2420014095-1">)</span><span·class="p">.</span><span·class="w">267 that·the·(only)·<code·class="inline">kex</code>·algorithm·<code·class="inline">'curve25519-sha256@libssh.org'</code>·was·selected:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">connection_info</span><span·class="p"·data-group-id="1389975367-1">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">algorithms</span><span·class="p"·data-group-id="1389975367-1">)</span><span·class="p">.</span><span·class="w">
268 </span><span·class="p"·data-group-id="2420014095-2">{</span><span·class="ss">algorithms</span><span·class="p">,</span><span·class="p"·data-group-id="2420014095-3">[</span><span·class="p"·data-group-id="2420014095-4">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="ss">&#[·...·truncated·by·diffoscope;·len:·84,·SHA:·11ff7d15eb4a43d25d477c5a51d91b7f207d5d90cf4119b601bb120b4b74841e·...·]-4">}</span><span·class="p">,</span><span·class="w">268 </span><span·class="p"·data-group-id="1389975367-2">{</span><span·class="ss">algorithms</span><span·class="p">,</span><span·class="p"·data-group-id="1389975367-3">[</span><span·class="p"·data-group-id="1389975367-4">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="ss">&#[·...·truncated·by·diffoscope;·len:·84,·SHA:·0efee213cab129ce4b81b43d4486420a2978699642173fd9a8bad10c9107956e·...·]-4">}</span><span·class="p">,</span><span·class="w">
269 ·············</span><span·class="p"·data-group-id="2420014095-5">{</span><span·class="ss">hkey</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p"·data-group-id="2420014095-5">}</span><span·class="p">,</span><span·class="w">269 ·············</span><span·class="p"·data-group-id="1389975367-5">{</span><span·class="ss">hkey</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p"·data-group-id="1389975367-5">}</span><span·class="p">,</span><span·class="w">
270 ·············</span><span·class="p"·data-group-id="2420014095-6">{</span><span·class="ss">send_mac</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="2420014095-6">}</span><span·class="p">,</span><span·class="w">270 ·············</span><span·class="p"·data-group-id="1389975367-6">{</span><span·class="ss">send_mac</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="1389975367-6">}</span><span·class="p">,</span><span·class="w">
271 ·············</span><span·class="p"·data-group-id="2420014095-7">{</span><span·class="ss">recv_mac</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="2420014095-7">}</span><span·class="p">,</span><span·class="w">271 ·············</span><span·class="p"·data-group-id="1389975367-7">{</span><span·class="ss">recv_mac</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="1389975367-7">}</span><span·class="p">,</span><span·class="w">
272 ·············</span><span·class="p"·data-group-id="2420014095-8">{</span><span·class="ss">encrypt</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p"·data-group-id="2420014095-8">}</span><span·class="p">,</span><span·class="w">272 ·············</span><span·class="p"·data-group-id="1389975367-8">{</span><span·class="ss">encrypt</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p"·data-group-id="1389975367-8">}</span><span·class="p">,</span><span·class="w">
273 ·············</span><span·class="p"·data-group-id="2420014095-9">{</span><span·class="ss">decrypt</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p"·data-group-id="2420014095-9">}</span><span·class="p">,</span><span·class="w">273 ·············</span><span·class="p"·data-group-id="1389975367-9">{</span><span·class="ss">decrypt</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p"·data-group-id="1389975367-9">}</span><span·class="p">,</span><span·class="w">
274 ·············</span><span·class="p"·data-group-id="2420014095-10">{</span><span·class="ss">compress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="2420014095-10">}</span><span·class="p">,</span><span·class="w">274 ·············</span><span·class="p"·data-group-id="1389975367-10">{</span><span·class="ss">compress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="1389975367-10">}</span><span·class="p">,</span><span·class="w">
275 ·············</span><span·class="p"·data-group-id="2420014095-11">{</span><span·class="ss">decompress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="2420014095-11">}</span><span·class="p">,</span><span·class="w">275 ·············</span><span·class="p"·data-group-id="1389975367-11">{</span><span·class="ss">decompress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="1389975367-11">}</span><span·class="p">,</span><span·class="w">
276 ·············</span><span·class="p"·data-group-id="2420014095-12">{</span><span·class="ss">send_ext_info</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="2420014095-12">}</span><span·class="p">,</span><span·class="w">276 ·············</span><span·class="p"·data-group-id="1389975367-12">{</span><span·class="ss">send_ext_info</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="1389975367-12">}</span><span·class="p">,</span><span·class="w">
277 ·············</span><span·class="p"·data-group-id="2420014095-13">{</span><span·class="ss">recv_ext_info</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="2420014095-13">}</span><span·class="p"·data-group-id="2420014095-3">]</span><span·class="p"·data-group-id="242001[·...·truncated·by·diffoscope;·len:·4,·SHA:·1afc50560ae4c6f49a38e10441181bb585ddb88e44b88ec76248defe2e6b1c04·...·]-2">}</span></code></pre><h4>Example·of·modify_algorithms·handling</h4><p>We·will·now·check·if·the277 ·············</span><span·class="p"·data-group-id="1389975367-13">{</span><span·class="ss">recv_ext_info</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="1389975367-13">}</span><span·class="p"·data-group-id="1389975367-3">]</span><span·class="p"·data-group-id="138997[·...·truncated·by·diffoscope;·len:·4,·SHA:·eac627facfe5f552055d76c0196a0ffc413dfeb940bc0ccb85b60fcaf7b773f5·...·]-2">}</span></code></pre><h4>Example·of·modify_algorithms·handling</h4><p>We·will·now·check·if·the
278 <a·href="ssh.html#t:modify_algorithms_common_option/0">modify_algorithms</a>·on·a·lower·level278 <a·href="ssh.html#t:modify_algorithms_common_option/0">modify_algorithms</a>·on·a·lower·level
279 is·applied·to·a279 is·applied·to·a
280 <a·href="ssh.html#t:preferred_algorithms_common_option/0">preferred_algorithms</a>·on·a·higher280 <a·href="ssh.html#t:preferred_algorithms_common_option/0">preferred_algorithms</a>·on·a·higher
281 level.·We·will·do·that·by·enabling·the·<code·class="inline">ssh-dss</code>·algorithm·that·is·supported,281 level.·We·will·do·that·by·enabling·the·<code·class="inline">ssh-dss</code>·algorithm·that·is·supported,
282 but·not·in·the·default·set.</p><p>The·config·file·<code·class="inline">ex3.config</code>·has·the·contents:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0089318774-1">[</span><span·class="w">282 but·not·in·the·default·set.</p><p>The·config·file·<code·class="inline">ex3.config</code>·has·the·contents:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7157811455-1">[</span><span·class="w">
283 ·</span><span·class="p"·data-group-id="0089318774-2">{</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0089318774-3">[</span><span·class="p"·data-group-id="0089318774-4">{</span><span·class="ss">modify_algorithms</span><span·class="p">,</span><span·class="w">283 ·</span><span·class="p"·data-group-id="7157811455-2">{</span><span·class="ss">ssh</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7157811455-3">[</span><span·class="p"·data-group-id="7157811455-4">{</span><span·class="ss">modify_algorithms</span><span·class="p">,</span><span·class="w">
284 ·········</span><span·class="p"·data-group-id="0089318774-5">[</span><span·class="w">·</span><span·class="p"·data-group-id="0089318774-6">{</span><span·class="ss">prepend</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0089318774-7">[</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·481,·SHA:·91ba3eb4a7016ef8b36c8e9412e6b97f12220e8084a9f2bf8a073ca78882e6bd·...·]-5">]</span><span·class="w">284 ·········</span><span·class="p"·data-group-id="7157811455-5">[</span><span·class="w">·</span><span·class="p"·data-group-id="7157811455-6">{</span><span·class="ss">prepend</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7157811455-7">[</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·481,·SHA:·87826104f7ec42fedd7492d5f308edfe6e4a2bc048aef09a35225d2f29b88177·...·]-5">]</span><span·class="w">
285 ········</span><span·class="p"·data-group-id="0089318774-4">}</span><span·class="p"·data-group-id="0089318774-3">]</span><span·class="p"·data-group-id="0089318774-2">}</span><span·class="w">285 ········</span><span·class="p"·data-group-id="7157811455-4">}</span><span·class="p"·data-group-id="7157811455-3">]</span><span·class="p"·data-group-id="7157811455-2">}</span><span·class="w">
286 </span><span·class="p"·data-group-id="0089318774-1">]</span><span·class="p">.</span></code></pre><p>A·newly·started·erlang·shell·shows·that·no·<code·class="inline">'ssh-dss'</code>·is·present·in·the286 </span><span·class="p"·data-group-id="7157811455-1">]</span><span·class="p">.</span></code></pre><p>A·newly·started·erlang·shell·shows·that·no·<code·class="inline">'ssh-dss'</code>·is·present·in·the
287 <code·class="inline">public_key</code>·entry:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="2537164644-1">(</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">default_algorithms</span><span·class="p"·data-group-id="2537164644-2">(</span><span·[·...·truncated·by·diffoscope;·len:·87,·SHA:·9d77b7f225ab8a73b4a14c32fc0fb67b3ec4cb339b94225f8c08589832a28737·...·]4-1">)</span><span·class="p">.</span><span·class="w">287 <code·class="inline">public_key</code>·entry:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9654855394-1">(</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">default_algorithms</span><span·class="p"·data-group-id="9654855394-2">(</span><span·[·...·truncated·by·diffoscope;·len:·87,·SHA:·0ce95d08eb626f09f01e2982c23d48060b51df57a8d6d0a9b21eb3d6aea63be8·...·]4-1">)</span><span·class="p">.</span><span·class="w">
288 </span><span·class="p"·data-group-id="2537164644-3">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">288 </span><span·class="p"·data-group-id="9654855394-3">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
289 ·</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-ed25519&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-ed448&#39;</span><span·class="p">,</span><span·class="w">289 ·</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-ed25519&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-ed448&#39;</span><span·class="p">,</span><span·class="w">
290 ·</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p"·data-group-id="2537164644-3">]</span><span·class="w">290 ·</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p"·data-group-id="9654855394-3">]</span><span·class="w">
291 </span><span·class="mi">2</span><span·class="o">&gt;</span></code></pre><p>A·call·to·<a·href="ssh.html#connect/3"><code·class="inline">ssh:connect/3</code></a>·removes·all·algorithms·but·one·of·each·type:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5621799318-1">(</span><span·class="p"·data-group-id="5621799318-1">)</span><span·class="p">.</span><span·class="w">291 </span><span·class="mi">2</span><span·class="o">&gt;</span></code></pre><p>A·call·to·<a·href="ssh.html#connect/3"><code·class="inline">ssh:connect/3</code></a>·removes·all·algorithms·but·one·of·each·type:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8870988359-1">(</span><span·class="p"·data-group-id="8870988359-1">)</span><span·class="p">.</span><span·class="w">
292 </span><span·class="ss">ok</span><span·class="gp·unselectable">292 </span><span·class="ss">ok</span><span·class="gp·unselectable">
293 3&gt;·</span><span·class="p"·data-group-id="5621799318-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="5621799318-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ssh</span><span·cl[·...·truncated·by·diffoscope;·len:·88,·SHA:·93f30caedddf291660447adc0a7f82cf46227008f189fd4919110d2e27d94dcf·...·]-3">(</span><span·class="ss">loopback</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">22</span><span·class="p">,</span><span·class="w">293 3&gt;·</span><span·class="p"·data-group-id="8870988359-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="8870988359-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ssh</span><span·cl[·...·truncated·by·diffoscope;·len:·88,·SHA:·ad915835172d6fab9c7a237fd2d0a2d98b49cac38991cc8ef115172a129d1df1·...·]-3">(</span><span·class="ss">loopback</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">22</span><span·class="p">,</span><span·class="w">
294 ························</span><span·class="p"·data-group-id="5621799318-4">[</span><span·class="p"·data-group-id="5621799318-5">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">294 ························</span><span·class="p"·data-group-id="8870988359-4">[</span><span·class="p"·data-group-id="8870988359-5">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">
295 ·························</span><span·class="p"·data-group-id="5621799318-6">[</span><span·class="p"·data-group-id="5621799318-7">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5621799318-8">[</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;[·...·truncated·by·diffoscope;·len:·101,·SHA:·f84adc05825de5d039801ceee1fdbb3abde412f51cc6c734cee5ce1da4520999·...·]-7">}</span><span·class="p">,</span><span·class="w">295 ·························</span><span·class="p"·data-group-id="8870988359-6">[</span><span·class="p"·data-group-id="8870988359-7">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8870988359-8">[</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;[·...·truncated·by·diffoscope;·len:·101,·SHA:·05704e4334faf2b4d545b38739b4e0336562ba62cb8ec4fda29ab6254e1693bf·...·]-7">}</span><span·class="p">,</span><span·class="w">
296 »       »       »       ··</span><span·class="p"·data-group-id="5621799318-9">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5621799318-10">[</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p"·data-group-id="5621799318-10">]</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·c08a2d3bd19cbca085f76ee2613df583ace7b0bc8283b735139ca1db79bc2120·...·]-9">}</span><span·class="p">,</span><span·class="w">296 »       »       »       ··</span><span·class="p"·data-group-id="8870988359-9">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8870988359-10">[</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p"·data-group-id="8870988359-10">]</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·147cf7cddc97eaea5f4b0f231f23e639e9016c69d32adb1422577c8c925316b8·...·]-9">}</span><span·class="p">,</span><span·class="w">
297 »       »       ··········</span><span·class="p"·data-group-id="5621799318-11">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5621799318-12">[</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="5621799[·...·truncated·by·diffoscope;·len:·57,·SHA:·093c610416be0c80dbc3a26378b2ad4b64fd2f2136dba88adb335e50780ee9b5·...·]-11">}</span><span·class="p">,</span><span·class="w">297 »       »       ··········</span><span·class="p"·data-group-id="8870988359-11">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8870988359-12">[</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="8870988[·...·truncated·by·diffoscope;·len:·57,·SHA:·86af64488d4ec3af6853fa6c91f3ff03da26cd731e4624488fb71ad9f5cceae6·...·]-11">}</span><span·class="p">,</span><span·class="w">
298 »       »       »       ··</span><span·class="p"·data-group-id="5621799318-13">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5621799318-14">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p"·data-group-id="5621799318-14">]</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·b53a03f4822fffcced66bd10e05171abedb3eb87e397a2241368ecd4199f1f43·...·]-13">}</span><span·class="p">,</span><span·class="w">298 »       »       »       ··</span><span·class="p"·data-group-id="8870988359-13">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8870988359-14">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p"·data-group-id="8870988359-14">]</span><sp[·...·truncated·by·diffoscope;·len:·38,·SHA:·fd0a3e18bfd1e6c14afb83f3286c8d28627f41356597eb584f700d4746973c69·...·]-13">}</span><span·class="p">,</span><span·class="w">
299 »       »       »       ··</span><span·class="p"·data-group-id="5621799318-15">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5621799318-16">[</span><span·class="ss">none</span><span·class="p"·data-group-id="5621799318-16">]</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·34ba0000ebc89b0c543b16d8c239d1687504b0db26730fc7dd6ddf40a9b742ef·...·]-15">}</span><span·class="w">299 »       »       »       ··</span><span·class="p"·data-group-id="8870988359-15">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8870988359-16">[</span><span·class="ss">none</span><span·class="p"·data-group-id="8870988359-16">]</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·8e334e0b0e3c2788c94ee6ea7b8cb8a3758591d384cc742bb1a2413c4fb24a7d·...·]-15">}</span><span·class="w">
300 »       »       »       ··</span><span·class="p"·data-group-id="5621799318-6">]</span><span·class="p"·data-group-id="5621799318-5">}</span><span·class="w">300 »       »       »       ··</span><span·class="p"·data-group-id="8870988359-6">]</span><span·class="p"·data-group-id="8870988359-5">}</span><span·class="w">
301 »       »       »       ·</span><span·class="p"·data-group-id="5621799318-4">]</span><span·class="p"·data-group-id="5621799318-3">)</span><span·class="p">.</span><span·class="w">301 »       »       »       ·</span><span·class="p"·data-group-id="8870988359-4">]</span><span·class="p"·data-group-id="8870988359-3">)</span><span·class="p">.</span><span·class="w">
302 </span><span·class="p"·data-group-id="5621799318-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.101</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="5621799318-17">}</span><span·class="gp·unselectable">302 </span><span·class="p"·data-group-id="8870988359-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.101</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="8870988359-17">}</span><span·class="gp·unselectable">
303 4&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">connection_info</span><span·class="p"·data-group-id="5621799318-18">(</span><span·class="n">C</span><span·class="p">,</span><span·class="ss">algorithms</span><span·class="p"·data-group-id="5621799318-18">)</span><span·class="p">.</span><span·class="w">303 4&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">connection_info</span><span·class="p"·data-group-id="8870988359-18">(</span><span·class="n">C</span><span·class="p">,</span><span·class="ss">algorithms</span><span·class="p"·data-group-id="8870988359-18">)</span><span·class="p">.</span><span·class="w">
304 </span><span·class="p"·data-group-id="5621799318-19">{</span><span·class="ss">algorithms</span><span·class="p">,</span><span·class="p"·data-group-id="5621799318-20">[</span><span·class="p"·data-group-id="5621799318-21">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·77,·SHA:·ef7552e0306d443304f83b1f615949ef202aa0fef7e593854d513cd59f62ab4b·...·]-21">}</span><span·class="p">,</span><span·class="w">304 </span><span·class="p"·data-group-id="8870988359-19">{</span><span·class="ss">algorithms</span><span·class="p">,</span><span·class="p"·data-group-id="8870988359-20">[</span><span·class="p"·data-group-id="8870988359-21">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·77,·SHA:·35dd1939de437c3878f56b4ce74209d975a027e8c1caf1fd0544ffb45de02c05·...·]-21">}</span><span·class="p">,</span><span·class="w">
305 ·············</span><span·class="p"·data-group-id="5621799318-22">{</span><span·class="ss">hkey</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="5621799318-22">}</span><span·class="p">,</span><span·class="w">305 ·············</span><span·class="p"·data-group-id="8870988359-22">{</span><span·class="ss">hkey</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="8870988359-22">}</span><span·class="p">,</span><span·class="w">
306 ·············</span><span·class="p"·data-group-id="5621799318-23">{</span><span·class="ss">send_mac</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="5621799318-23">}</span><span·class="p">,</span><span·class="w">306 ·············</span><span·class="p"·data-group-id="8870988359-23">{</span><span·class="ss">send_mac</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="8870988359-23">}</span><span·class="p">,</span><span·class="w">
307 ·············</span><span·class="p"·data-group-id="5621799318-24">{</span><span·class="ss">recv_mac</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="5621799318-24">}</span><span·class="p">,</span><span·class="w">307 ·············</span><span·class="p"·data-group-id="8870988359-24">{</span><span·class="ss">recv_mac</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="8870988359-24">}</span><span·class="p">,</span><span·class="w">
308 ·············</span><span·class="p"·data-group-id="5621799318-25">{</span><span·class="ss">encrypt</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="5621799318-25">}</span><span·class="p">,</span><span·class="w">308 ·············</span><span·class="p"·data-group-id="8870988359-25">{</span><span·class="ss">encrypt</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="8870988359-25">}</span><span·class="p">,</span><span·class="w">
309 ·············</span><span·class="p"·data-group-id="5621799318-26">{</span><span·class="ss">decrypt</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="5621799318-26">}</span><span·class="p">,</span><span·class="w">309 ·············</span><span·class="p"·data-group-id="8870988359-26">{</span><span·class="ss">decrypt</span><span·class="p">,</span><span·class="ss">&#39;chacha20-poly1305@openssh.com&#39;</span><span·class="p"·data-group-id="8870988359-26">}</span><span·class="p">,</span><span·class="w">
310 ·············</span><span·class="p"·data-group-id="5621799318-27">{</span><span·class="ss">compress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="5621799318-27">}</span><span·class="p">,</span><span·class="w">310 ·············</span><span·class="p"·data-group-id="8870988359-27">{</span><span·class="ss">compress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="8870988359-27">}</span><span·class="p">,</span><span·class="w">
311 ·············</span><span·class="p"·data-group-id="5621799318-28">{</span><span·class="ss">decompress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="5621799318-28">}</span><span·class="p">,</span><span·class="w">311 ·············</span><span·class="p"·data-group-id="8870988359-28">{</span><span·class="ss">decompress</span><span·class="p">,</span><span·class="ss">none</span><span·class="p"·data-group-id="8870988359-28">}</span><span·class="p">,</span><span·class="w">
312 ·············</span><span·class="p"·data-group-id="5621799318-29">{</span><span·class="ss">send_ext_info</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="5621799318-29">}</span><span·class="p">,</span><span·class="w">312 ·············</span><span·class="p"·data-group-id="8870988359-29">{</span><span·class="ss">send_ext_info</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="8870988359-29">}</span><span·class="p">,</span><span·class="w">
313 ·············</span><span·class="p"·data-group-id="5621799318-30">{</span><span·class="ss">recv_ext_info</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="5621799318-30">}</span><span·class="p"·data-group-id="5621799318-20">]</span><span·class="p"·data-group-id="56217[·...·truncated·by·diffoscope;·len:·5,·SHA:·41ddb5124bbe02775af31bc7337faaf1711de9a3d1209fdcba8d52f51b7ad0e6·...·]-19">}</span><span·class="w">313 ·············</span><span·class="p"·data-group-id="8870988359-30">{</span><span·class="ss">recv_ext_info</span><span·class="p">,</span><span·class="ss">true</span><span·class="p"·data-group-id="8870988359-30">}</span><span·class="p"·data-group-id="8870988359-20">]</span><span·class="p"·data-group-id="88709[·...·truncated·by·diffoscope;·len:·5,·SHA:·afa264f87ca538b9ff1637aa7e3c95efb2bf6ff52389d8fc71f177ec474168e4·...·]-19">}</span><span·class="w">
314 </span><span·class="mi">5</span><span·class="o">&gt;</span></code></pre><p>But·<code·class="inline">'ssh-dss'</code>·is·selected·although·the·call·inserted·<em>only</em>314 </span><span·class="mi">5</span><span·class="o">&gt;</span></code></pre><p>But·<code·class="inline">'ssh-dss'</code>·is·selected·although·the·call·inserted·<em>only</em>
315 <code·class="inline">'ecdsa-sha2-nistp256'</code>·as·acceptable.</p><p>This·example·showed·that·we·could·augment·the·set·of·algorithms·with·a315 <code·class="inline">'ecdsa-sha2-nistp256'</code>·as·acceptable.</p><p>This·example·showed·that·we·could·augment·the·set·of·algorithms·with·a
316 config-file·without·the·need·to·change·the·actual·call.</p><p>For·demonstration·purposes·we·used·<code·class="inline">prepend</code>·instead·of·<code·class="inline">append</code>.·This·forces316 config-file·without·the·need·to·change·the·actual·call.</p><p>For·demonstration·purposes·we·used·<code·class="inline">prepend</code>·instead·of·<code·class="inline">append</code>.·This·forces
317 the·negotiation·to·select·<code·class="inline">ssh-dss</code>·since·the·the·full·list·of·public·key317 the·negotiation·to·select·<code·class="inline">ssh-dss</code>·since·the·the·full·list·of·public·key
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166 ··</a>166 ··</a>
167 ··<span·class="text">The·SSH·app's·mechanism</span>167 ··<span·class="text">The·SSH·app's·mechanism</span>
168 </h3>168 </h3>
169 <p>The·set·of·algorithms·that·the·SSH·app·uses·by·default·depends·on·the·algorithms169 <p>The·set·of·algorithms·that·the·SSH·app·uses·by·default·depends·on·the·algorithms
170 supported·by·the:</p><ul><li><a·href="../../../../lib/crypto-5.5.3/doc/html/crypto.html"><code·class="inline">crypto</code></a>·app,</li><li>The·cryptolib·OTP·is·linked·with,·usually·the·one·the·OS·uses,·probably170 supported·by·the:</p><ul><li><a·href="../../../../lib/crypto-5.5.3/doc/html/crypto.html"><code·class="inline">crypto</code></a>·app,</li><li>The·cryptolib·OTP·is·linked·with,·usually·the·one·the·OS·uses,·probably
171 OpenSSL,</li><li>and·finally·what·the·SSH·app·implements</li></ul><p>Due·to·this,·it·impossible·to·list·in·documentation·what·algorithms·that·are171 OpenSSL,</li><li>and·finally·what·the·SSH·app·implements</li></ul><p>Due·to·this,·it·impossible·to·list·in·documentation·what·algorithms·that·are
172 available·in·a·certain·installation.</p><p>There·is·an·important·command·to·list·the·actual·algorithms·and·their·ordering:172 available·in·a·certain·installation.</p><p>There·is·an·important·command·to·list·the·actual·algorithms·and·their·ordering:
173 <a·href="ssh.html#default_algorithms/0"><code·class="inline">ssh:default_algorithms/0</code></a>.</p><pre·id="example_default_algorithms"><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">0&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">default_algorithms</span><span·class="p"·data-group-id="0745293733-1">(</span><span·class="p"·data-group-id="0745293733-1">)</span><span·class="p">.</span><span·class="w">173 <a·href="ssh.html#default_algorithms/0"><code·class="inline">ssh:default_algorithms/0</code></a>.</p><pre·id="example_default_algorithms"><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">0&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">default_algorithms</span><span·class="p"·data-group-id="8242474746-1">(</span><span·class="p"·data-group-id="8242474746-1">)</span><span·class="p">.</span><span·class="w">
174 </span><span·class="p"·data-group-id="0745293733-2">[</span><span·class="p"·data-group-id="0745293733-3">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-4">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdh-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">174 </span><span·class="p"·data-group-id="8242474746-2">[</span><span·class="p"·data-group-id="8242474746-3">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-4">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdh-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
175 ·······</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha256&#39;</span><span·class="p">,</span><span·class="w">175 ·······</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha256&#39;</span><span·class="p">,</span><span·class="w">
176 ·······</span><span·class="ss">&#39;diffie-hellman-group16-sha512&#39;</span><span·class="p">,</span><span·class="w">176 ·······</span><span·class="ss">&#39;diffie-hellman-group16-sha512&#39;</span><span·class="p">,</span><span·class="w">
177 ·······</span><span·class="ss">&#39;diffie-hellman-group18-sha512&#39;</span><span·class="p">,</span><span·class="w">177 ·······</span><span·class="ss">&#39;diffie-hellman-group18-sha512&#39;</span><span·class="p">,</span><span·class="w">
178 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p">,</span><span·class="w">178 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p">,</span><span·class="w">
179 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha1&#39;</span><span·class="p">,</span><span·class="w">179 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha1&#39;</span><span·class="p">,</span><span·class="w">
180 ·······</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha1&#39;</span><span·class="p"·data-group-id="0745293733-4">]</span><span·class="p"·data-group-id="0745293733-3">}</span><span·class="p">,</span><span·class="w">180 ·······</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha1&#39;</span><span·class="p"·data-group-id="8242474746-4">]</span><span·class="p"·data-group-id="8242474746-3">}</span><span·class="p">,</span><span·class="w">
181 ·</span><span·class="p"·data-group-id="0745293733-5">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-6">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">181 ·</span><span·class="p"·data-group-id="8242474746-5">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-6">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
182 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">182 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">
183 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="0745293733-6">]</span><span·class="p"·data-group-id="0745293733-5">}</span><span·class="p">,</span><span·class="w">183 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="8242474746-6">]</span><span·class="p"·data-group-id="8242474746-5">}</span><span·class="p">,</span><span·class="w">
184 ·</span><span·class="p"·data-group-id="0745293733-7">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-8">[</span><span·class="p"·data-group-id="0745293733-9">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·d29750f1c54b21a0c20db9fb2f92ebb41b5ec821a8f33ac034b4ed36190e8362·...·]-10">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">184 ·</span><span·class="p"·data-group-id="8242474746-7">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-8">[</span><span·class="p"·data-group-id="8242474746-9">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·7d9dcf81fc88ef2e52977f854cf0ab32db1dae463499663d4b34ae6cb2ac3762·...·]-10">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">
185 ··························</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">185 ··························</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">
186 ··························</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="0745293733-10">]</span><span·class="p"·data-group-id="0745293733-9">}</span><span·class="p">,</span><span·class="w">186 ··························</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="8242474746-10">]</span><span·class="p"·data-group-id="8242474746-9">}</span><span·class="p">,</span><span·class="w">
187 ··········</span><span·class="p"·data-group-id="0745293733-11">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-12">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="w">187 ··········</span><span·class="p"·data-group-id="8242474746-11">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-12">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="w">
188 ··························</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="w">188 ··························</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="w">
189 ··························</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="0745293733-12">]</span><span·class="p"·data-group-id="0745293733-11">}</span><span·class="p"·data-group-id="0745293733-8">]</span><span·class="p"·data-group-id="0745293733-7">}</span><span·class="p">,</span><span·class="w">189 ··························</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="8242474746-12">]</span><span·class="p"·data-group-id="8242474746-11">}</span><span·class="p"·data-group-id="8242474746-8">]</span><span·class="p"·data-group-id="8242474746-7">}</span><span·class="p">,</span><span·class="w">
190 ·</span><span·class="p"·data-group-id="0745293733-13">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-14">[</span><span·class="p"·data-group-id="0745293733-15">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·d29750f1c54b21a0c20db9fb2f92ebb41b5ec821a8f33ac034b4ed36190e8362·...·]-16">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">190 ·</span><span·class="p"·data-group-id="8242474746-13">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-14">[</span><span·class="p"·data-group-id="8242474746-15">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·7d9dcf81fc88ef2e52977f854cf0ab32db1dae463499663d4b34ae6cb2ac3762·...·]-16">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">
191 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="0745293733-16">]</span><span·class="p"·data-group-id="0745293733-15">}</span><span·class="p">,</span><span·class="w">191 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="8242474746-16">]</span><span·class="p"·data-group-id="8242474746-15">}</span><span·class="p">,</span><span·class="w">
192 ·······</span><span·class="p"·data-group-id="0745293733-17">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-18">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">192 ·······</span><span·class="p"·data-group-id="8242474746-17">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-18">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">
193 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="0745293733-18">]</span><span·class="p"·data-group-id="0745293733-17">}</span><span·class="p"·data-group-id="0745293733-14">]</span><span·class="p"·data-group-id="0745293733-13">}</span><span·class="p">,</span><span·class="w">193 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="8242474746-18">]</span><span·class="p"·data-group-id="8242474746-17">}</span><span·class="p"·data-group-id="8242474746-14">]</span><span·class="p"·data-group-id="8242474746-13">}</span><span·class="p">,</span><span·class="w">
194 ·</span><span·class="p"·data-group-id="0745293733-19">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-20">[</span><span·class="p"·data-group-id="0745293733-21">{</span><span·class="ss">client2server</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·298,·SHA:·a0a16e575f968c533c6db29e99baa51c0ed06575c064a32e6e82a219def4afcf·...·]-21">}</span><span·class="p">,</span><span·class="w">194 ·</span><span·class="p"·data-group-id="8242474746-19">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-20">[</span><span·class="p"·data-group-id="8242474746-21">{</span><span·class="ss">client2server</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·298,·SHA:·adf620e12ca96a498b2006130ea7a0682cefab184e963165ca7e16c5ea37f4f8·...·]-21">}</span><span·class="p">,</span><span·class="w">
195 ···············</span><span·class="p"·data-group-id="0745293733-23">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="0745293733-24">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">[·...·truncated·by·diffoscope;·len:·293,·SHA:·ba0785a720ada1c3f6f8cdc5c0b7a5e3e769a5f1d84604476db17ac9642ceb82·...·]-2">]</span></code></pre><p>To·change·the·algorithm·list,·there·are·two·options·which·can·be·used·in195 ···············</span><span·class="p"·data-group-id="8242474746-23">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="8242474746-24">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">[·...·truncated·by·diffoscope;·len:·293,·SHA:·7a2c42b79e0158abdb1fa2c98682a190a2d25f4fc11f66d20eb4d88e31d46461·...·]-2">]</span></code></pre><p>To·change·the·algorithm·list,·there·are·two·options·which·can·be·used·in
196 <a·href="ssh.html#connect/3">ssh:connect/2,3,4</a>·and·<a·href="ssh.html#daemon/2">ssh:daemon/2,3</a>.·The196 <a·href="ssh.html#connect/3">ssh:connect/2,3,4</a>·and·<a·href="ssh.html#daemon/2">ssh:daemon/2,3</a>.·The
197 options·could·of·course·be·used·in·all·other·functions·that·initiates197 options·could·of·course·be·used·in·all·other·functions·that·initiates
198 connections.</p><p>The·options·are198 connections.</p><p>The·options·are
199 <a·href="ssh.html#t:preferred_algorithms_common_option/0">preferred_algorithms</a>·and199 <a·href="ssh.html#t:preferred_algorithms_common_option/0">preferred_algorithms</a>·and
200 <a·href="ssh.html#t:modify_algorithms_common_option/0">modify_algorithms</a>.·The·first·one200 <a·href="ssh.html#t:modify_algorithms_common_option/0">modify_algorithms</a>.·The·first·one
201 replaces·the·default·set,·while·the·latter·modifies·the·default·set.</p><h2·id="replacing-the-default-set-preferred_algorithms"·class="section-heading">201 replaces·the·default·set,·while·the·latter·modifies·the·default·set.</p><h2·id="replacing-the-default-set-preferred_algorithms"·class="section-heading">
202 ··<a·href="#replacing-the-default-set-preferred_algorithms"·class="hover-link">202 ··<a·href="#replacing-the-default-set-preferred_algorithms"·class="hover-link">
Offset 211, 264 lines modifiedOffset 211, 264 lines modified
211 friends·does.</p><h3·id="example-1"·class="section-heading">211 friends·does.</p><h3·id="example-1"·class="section-heading">
212 ··<a·href="#example-1"·class="hover-link">212 ··<a·href="#example-1"·class="hover-link">
213 ····<i·class="ri-link-m"·aria-hidden="true"></i>213 ····<i·class="ri-link-m"·aria-hidden="true"></i>
214 ··</a>214 ··</a>
215 ··<span·class="text">Example·1</span>215 ··<span·class="text">Example·1</span>
216 </h3>216 </h3>
217 <p>Replace·the·kex·algorithms·list·with·the·single·algorithm217 <p>Replace·the·kex·algorithms·list·with·the·single·algorithm
218 <code·class="inline">'diffie-hellman-group14-sha256'</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">chk_algos_opts</span><span·class="p"·data-group-id="4834073699-1">(</span><span·class="w">218 <code·class="inline">'diffie-hellman-group14-sha256'</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">chk_algos_opts</span><span·class="p"·data-group-id="3857281423-1">(</span><span·class="w">
219 ···············</span><span·class="p"·data-group-id="4834073699-2">[</span><span·class="p"·data-group-id="4834073699-3">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">219 ···············</span><span·class="p"·data-group-id="3857281423-2">[</span><span·class="p"·data-group-id="3857281423-3">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">
220 ·····················</span><span·class="p"·data-group-id="4834073699-4">[</span><span·class="p"·data-group-id="4834073699-5">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4834073699-6">[</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#[·...·truncated·by·diffoscope;·len:·104,·SHA:·0c451670534d14c43b7088d4c95943c4bcf49f817c8ad4d4c47db3a14000da1f·...·]-5">}</span><span·class="w">220 ·····················</span><span·class="p"·data-group-id="3857281423-4">[</span><span·class="p"·data-group-id="3857281423-5">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3857281423-6">[</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#[·...·truncated·by·diffoscope;·len:·104,·SHA:·fbf20cc0ab9fa2ffcda7fcc0f73a2c41cbb64a35fce286b2aad553ebe558c9f8·...·]-5">}</span><span·class="w">
221 ·····················</span><span·class="p"·data-group-id="4834073699-4">]</span><span·class="w">221 ·····················</span><span·class="p"·data-group-id="3857281423-4">]</span><span·class="w">
222 ················</span><span·class="p"·data-group-id="4834073699-3">}</span><span·class="w">222 ················</span><span·class="p"·data-group-id="3857281423-3">}</span><span·class="w">
223 ··············</span><span·class="p"·data-group-id="4834073699-2">]</span><span·class="p"·data-group-id="4834073699-1">)</span><span·class="p">.</span><span·class="w">223 ··············</span><span·class="p"·data-group-id="3857281423-2">]</span><span·class="p"·data-group-id="3857281423-1">)</span><span·class="p">.</span><span·class="w">
224 </span><span·class="p"·data-group-id="4834073699-7">[</span><span·class="p"·data-group-id="4834073699-8">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-9">[</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p[·...·truncated·by·diffoscope;·len:·80,·SHA:·a23d5cde1f166546a0fc469962e2a772b228588b49cea76585aa15da62fa568e·...·]-8">}</span><span·class="p">,</span><span·class="w">224 </span><span·class="p"·data-group-id="3857281423-7">[</span><span·class="p"·data-group-id="3857281423-8">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-9">[</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p[·...·truncated·by·diffoscope;·len:·80,·SHA:·16741107e3a9de6aeba198b6f93db83ddfd0e71183fadd141055b5d7664df2c9·...·]-8">}</span><span·class="p">,</span><span·class="w">
225 ·</span><span·class="p"·data-group-id="4834073699-10">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-11">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">225 ·</span><span·class="p"·data-group-id="3857281423-10">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-11">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
226 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">226 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">
227 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="4834073699-11">]</span><span·class="p"·data-group-id="4834073699-10">}</span><span·class="p">,</span><span·class="w">227 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="3857281423-11">]</span><span·class="p"·data-group-id="3857281423-10">}</span><span·class="p">,</span><span·class="w">
228 ·</span><span·class="p"·data-group-id="4834073699-12">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-13">[</span><span·class="p"·data-group-id="4834073699-14">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·0e93fcf60f15f34808339afbea8c97c4ae0a1711b167399cbf2235c09bb9e5f1·...·]-15">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">228 ·</span><span·class="p"·data-group-id="3857281423-12">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-13">[</span><span·class="p"·data-group-id="3857281423-14">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·31,·SHA:·b78d5765f2b9b4d9be27f0a87b825877c566ff0c42daa92c3dc5848b6e2d7573·...·]-15">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">
229 ··························</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">229 ··························</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="w">
230 ··························</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="4834073699-15">]</span><span·class="p"·data-group-id="4834073699-14">}</span><span·class="p">,</span><span·class="w">230 ··························</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="3857281423-15">]</span><span·class="p"·data-group-id="3857281423-14">}</span><span·class="p">,</span><span·class="w">
231 ··········</span><span·class="p"·data-group-id="4834073699-16">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-17">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="w">231 ··········</span><span·class="p"·data-group-id="3857281423-16">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-17">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="w">
232 ··························</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="w">232 ··························</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="w">
233 ··························</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="4834073699-17">]</span><span·class="p"·data-group-id="4834073699-16">}</span><span·class="p"·data-group-id="4834073699-13">]</span><span·class="p"·data-group-id="4834073699-12">}</span><span·class="p">,</span><span·class="w">233 ··························</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="3857281423-17">]</span><span·class="p"·data-group-id="3857281423-16">}</span><span·class="p"·data-group-id="3857281423-13">]</span><span·class="p"·data-group-id="3857281423-12">}</span><span·class="p">,</span><span·class="w">
234 ·</span><span·class="p"·data-group-id="4834073699-18">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-19">[</span><span·class="p"·data-group-id="4834073699-20">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·4fa83f054d235bf8da2e65e3da1a31ba4b2bf895eea0e351a91c15ec9d811ba4·...·]-21">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">234 ·</span><span·class="p"·data-group-id="3857281423-18">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-19">[</span><span·class="p"·data-group-id="3857281423-20">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·650f66cb150f1ff759a8328db42d48cd33d76d2923fe1762765114010d6ca976·...·]-21">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">
235 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="4834073699-21">]</span><span·class="p"·data-group-id="4834073699-20">}</span><span·class="p">,</span><span·class="w">235 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="3857281423-21">]</span><span·class="p"·data-group-id="3857281423-20">}</span><span·class="p">,</span><span·class="w">
236 ·······</span><span·class="p"·data-group-id="4834073699-22">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-23">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">236 ·······</span><span·class="p"·data-group-id="3857281423-22">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-23">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">
237 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="4834073699-23">]</span><span·class="p"·data-group-id="4834073699-22">}</span><span·class="p"·data-group-id="4834073699-19">]</span><span·class="p"·data-group-id="4834073699-18">}</span><span·class="p">,</span><span·class="w">237 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="3857281423-23">]</span><span·class="p"·data-group-id="3857281423-22">}</span><span·class="p"·data-group-id="3857281423-19">]</span><span·class="p"·data-group-id="3857281423-18">}</span><span·class="p">,</span><span·class="w">
238 ·</span><span·class="p"·data-group-id="4834073699-24">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-25">[</span><span·class="p"·data-group-id="4834073699-26">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-27">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="4834073699-27">]</span><span·class="p"·data-group-id="4834073699-26">}</span><span·class="p">,</span><span·class="w"> 
239 ···············</span><span·class="p"·data-group-id="4834073699-28">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="4834073699-29">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="s[·...·truncated·by·diffoscope;·len:·517,·SHA:·312651caebef08735378f5e2584ad5088bfa92ba535d4086ba407de7f6727abb·...·]238 ·</span><span·class="p"·data-group-id="3857281423-24">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-25">[</span><span·class="p"·data-group-id="3857281423-26">{</span><span·class="ss">client2serv[·...·truncated·by·diffoscope;·len:·389,·SHA:·c979fb21ee47e01a280dffe133ac8a9659abce9a8f79007fa15682b1143cbc13·...·]
 239 ···············</span><span·class="p"·data-group-id="3857281423-28">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3857281423-29">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="3857281423-29">]</span><span·class="p"·data-group-id="3857281423-28">}</span><span·class="p"·data-group-id="3857281423-25">]</span><span·class="p"·data-group-id="3857281423-24">}</span><span·class="p"·data-group-id="3857281423-7">]</span></code></pre><p>Note·that·the·unmentioned·lists·(<code·class="inline">public_key</code>,·<code·class="inline">cipher</code>,·<code·class="inline">mac</code>·and
240 <code·class="inline">compression</code>)·are·unchanged.</p><h3·id="example-2"·class="section-heading">240 <code·class="inline">compression</code>)·are·unchanged.</p><h3·id="example-2"·class="section-heading">
241 ··<a·href="#example-2"·class="hover-link">241 ··<a·href="#example-2"·class="hover-link">
242 ····<i·class="ri-link-m"·aria-hidden="true"></i>242 ····<i·class="ri-link-m"·aria-hidden="true"></i>
243 ··</a>243 ··</a>
244 ··<span·class="text">Example·2</span>244 ··<span·class="text">Example·2</span>
245 </h3>245 </h3>
246 <p>In·the·lists·that·are·divided·in·two·for·the·two·directions·(for·example·<code·class="inline">cipher</code>)·it·is246 <p>In·the·lists·that·are·divided·in·two·for·the·two·directions·(for·example·<code·class="inline">cipher</code>)·it·is
247 possible·to·change·both·directions·at·once:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">chk_algos_opts</span><span·class="p"·data-group-id="3060585186-1">(</span><span·class="w">247 possible·to·change·both·directions·at·once:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">chk_algos_opts</span><span·class="p"·data-group-id="1969578727-1">(</span><span·class="w">
248 ···············</span><span·class="p"·data-group-id="3060585186-2">[</span><span·class="p"·data-group-id="3060585186-3">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">248 ···············</span><span·class="p"·data-group-id="1969578727-2">[</span><span·class="p"·data-group-id="1969578727-3">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">
249 ·····················</span><span·class="p"·data-group-id="3060585186-4">[</span><span·class="p"·data-group-id="3060585186-5">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-6">[</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·64,·SHA:·91f83771016a55ce5480c6321f2391b080f03d49c94c6c8ce14f3903ce97bbb9·...·]-5">}</span><span·class="w">249 ·····················</span><span·class="p"·data-group-id="1969578727-4">[</span><span·class="p"·data-group-id="1969578727-5">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-6">[</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·64,·SHA:·52aa44e5d242c1846c65936889cd14e6d76bb742ce3c22a34d3a00c660006b33·...·]-5">}</span><span·class="w">
250 ·····················</span><span·class="p"·data-group-id="3060585186-4">]</span><span·class="w">250 ·····················</span><span·class="p"·data-group-id="1969578727-4">]</span><span·class="w">
251 ················</span><span·class="p"·data-group-id="3060585186-3">}</span><span·class="w">251 ················</span><span·class="p"·data-group-id="1969578727-3">}</span><span·class="w">
252 ··············</span><span·class="p"·data-group-id="3060585186-2">]</span><span·class="p"·data-group-id="3060585186-1">)</span><span·class="p">.</span><span·class="w">252 ··············</span><span·class="p"·data-group-id="1969578727-2">]</span><span·class="p"·data-group-id="1969578727-1">)</span><span·class="p">.</span><span·class="w">
253 </span><span·class="p"·data-group-id="3060585186-7">[</span><span·class="p"·data-group-id="3060585186-8">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-9">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdh-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">253 </span><span·class="p"·data-group-id="1969578727-7">[</span><span·class="p"·data-group-id="1969578727-8">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-9">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdh-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
254 ·······</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha256&#39;</span><span·class="p">,</span><span·class="w">254 ·······</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha256&#39;</span><span·class="p">,</span><span·class="w">
255 ·······</span><span·class="ss">&#39;diffie-hellman-group16-sha512&#39;</span><span·class="p">,</span><span·class="w">255 ·······</span><span·class="ss">&#39;diffie-hellman-group16-sha512&#39;</span><span·class="p">,</span><span·class="w">
256 ·······</span><span·class="ss">&#39;diffie-hellman-group18-sha512&#39;</span><span·class="p">,</span><span·class="w">256 ·······</span><span·class="ss">&#39;diffie-hellman-group18-sha512&#39;</span><span·class="p">,</span><span·class="w">
257 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p">,</span><span·class="w">257 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p">,</span><span·class="w">
258 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha1&#39;</span><span·class="p">,</span><span·class="w">258 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha1&#39;</span><span·class="p">,</span><span·class="w">
259 ·······</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha1&#39;</span><span·class="p"·data-group-id="3060585186-9">]</span><span·class="p"·data-group-id="3060585186-8">}</span><span·class="p">,</span><span·class="w">259 ·······</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha1&#39;</span><span·class="p"·data-group-id="1969578727-9">]</span><span·class="p"·data-group-id="1969578727-8">}</span><span·class="p">,</span><span·class="w">
260 ·</span><span·class="p"·data-group-id="3060585186-10">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-11">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">260 ·</span><span·class="p"·data-group-id="1969578727-10">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-11">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
261 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">261 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">
262 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="3060585186-11">]</span><span·class="p"·data-group-id="3060585186-10">}</span><span·class="p">,</span><span·class="w">262 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="1969578727-11">]</span><span·class="p"·data-group-id="1969578727-10">}</span><span·class="p">,</span><span·class="w">
263 ·</span><span·class="p"·data-group-id="3060585186-12">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-13">[</span><span·class="p"·data-group-id="3060585186-14">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·183,·SHA:·2de5948ea38b3948a3f1f9e5437473be834e0ff01f737fc5ba69c5a2226d0eed·...·]-14">}</span><span·class="p">,</span><span·class="w">263 ·</span><span·class="p"·data-group-id="1969578727-12">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-13">[</span><span·class="p"·data-group-id="1969578727-14">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·183,·SHA:·5605178966d95a5797a1ec00e153d4a76986e4e8bfc57df1e0f0536d9ccbe324·...·]-14">}</span><span·class="p">,</span><span·class="w">
264 ··········</span><span·class="p"·data-group-id="3060585186-16">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-17">[</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p"·data-group-id="3060585186-17">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·129,·SHA:·3084d22d090fcd7826295a0f651a27c059c65e292883986637ee6b61cdc5ce2e·...·]-12">}</span><span·class="p">,</span><span·class="w">264 ··········</span><span·class="p"·data-group-id="1969578727-16">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-17">[</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p"·data-group-id="1969578727-17">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·129,·SHA:·5096edc5f506b5cfc1c686809de1e2e3873b147653349d80a9b50b9613ef7a15·...·]-12">}</span><span·class="p">,</span><span·class="w">
265 ·</span><span·class="p"·data-group-id="3060585186-18">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-19">[</span><span·class="p"·data-group-id="3060585186-20">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·7dc092d551bb35eebeda6b043deee07f35cfa56b11aa23739e6b4ee1589b965e·...·]-21">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">265 ·</span><span·class="p"·data-group-id="1969578727-18">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-19">[</span><span·class="p"·data-group-id="1969578727-20">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·87509f0e58eb6c1dc9f0d342021db60eef7168278f516204c4a77724fdcecc26·...·]-21">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">
266 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="3060585186-21">]</span><span·class="p"·data-group-id="3060585186-20">}</span><span·class="p">,</span><span·class="w">266 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="1969578727-21">]</span><span·class="p"·data-group-id="1969578727-20">}</span><span·class="p">,</span><span·class="w">
267 ·······</span><span·class="p"·data-group-id="3060585186-22">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-23">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">267 ·······</span><span·class="p"·data-group-id="1969578727-22">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-23">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha2-512&#39;</span><span·class="p">,</span><span·class="w">
268 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="3060585186-23">]</span><span·class="p"·data-group-id="3060585186-22">}</span><span·class="p"·data-group-id="3060585186-19">]</span><span·class="p"·data-group-id="3060585186-18">}</span><span·class="p">,</span><span·class="w">268 ·······················</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p"·data-group-id="1969578727-23">]</span><span·class="p"·data-group-id="1969578727-22">}</span><span·class="p"·data-group-id="1969578727-19">]</span><span·class="p"·data-group-id="1969578727-18">}</span><span·class="p">,</span><span·class="w">
269 ·</span><span·class="p"·data-group-id="3060585186-24">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-25">[</span><span·class="p"·data-group-id="3060585186-26">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-27">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="3060585186-27">]</span><span·class="p"·data-group-id="3060585186-26">}</span><span·class="p">,</span><span·class="w"> 
270 ···············</span><span·class="p"·data-group-id="3060585186-28">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3060585186-29">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="s[·...·truncated·by·diffoscope;·len:·470,·SHA:·d076b6827167c7dca19731238db4c560e03667214af7c2f0a60a1213292a36fb·...·]269 ·</span><span·class="p"·data-group-id="1969578727-24">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-25">[</span><span·class="p"·data-group-id="1969578727-26">{</span><span·class="ss">client2serv[·...·truncated·by·diffoscope;·len:·389,·SHA:·6247e4e004c6ff357d61c60f07304758aa393c2ac49341d3629f4037d513f985·...·]
 270 ···············</span><span·class="p"·data-group-id="1969578727-28">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="1969578727-29">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">&#39;zlib@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="1969578727-29">]</span><span·class="p"·data-group-id="1969578727-28">}</span><span·class="p"·data-group-id="1969578727-25">]</span><span·class="p"·data-group-id="1969578727-24">}</span><span·class="p"·data-group-id="1969578727-7">]</span></code></pre><p>Note·that·both·lists·in·<code·class="inline">cipher</code>·has·been·changed·to·the·provided·value
271 (<code·class="inline">'aes128-ctr'</code>).</p><h3·id="example-3"·class="section-heading">271 (<code·class="inline">'aes128-ctr'</code>).</p><h3·id="example-3"·class="section-heading">
272 ··<a·href="#example-3"·class="hover-link">272 ··<a·href="#example-3"·class="hover-link">
273 ····<i·class="ri-link-m"·aria-hidden="true"></i>273 ····<i·class="ri-link-m"·aria-hidden="true"></i>
274 ··</a>274 ··</a>
275 ··<span·class="text">Example·3</span>275 ··<span·class="text">Example·3</span>
276 </h3>276 </h3>
277 <p>In·the·lists·that·are·divided·in·two·for·the·two·directions·(for·example·<code·class="inline">cipher</code>)·it·is277 <p>In·the·lists·that·are·divided·in·two·for·the·two·directions·(for·example·<code·class="inline">cipher</code>)·it·is
278 possible·to·change·only·one·of·the·directions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">chk_algos_opts</span><span·class="p"·data-group-id="9413750726-1">(</span><span·class="w">278 possible·to·change·only·one·of·the·directions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">chk_algos_opts</span><span·class="p"·data-group-id="3195494955-1">(</span><span·class="w">
279 ···············</span><span·class="p"·data-group-id="9413750726-2">[</span><span·class="p"·data-group-id="9413750726-3">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">279 ···············</span><span·class="p"·data-group-id="3195494955-2">[</span><span·class="p"·data-group-id="3195494955-3">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">
280 ·····················</span><span·class="p"·data-group-id="9413750726-4">[</span><span·class="p"·data-group-id="9413750726-5">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="9413750726-6">[</span><span·class="p"·data-group-id="9413750726-7">{</span><span·class="ss">clie[·...·truncated·by·diffoscope;·len:·337,·SHA:·03d8ca6d8d80e43f9cbc9f55ce1b547f59cc8c7f916d18484c44cd6953a09cae·...·]-5">}</span><span·class="w">280 ·····················</span><span·class="p"·data-group-id="3195494955-4">[</span><span·class="p"·data-group-id="3195494955-5">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="3195494955-6">[</span><span·class="p"·data-group-id="3195494955-7">{</span><span·class="ss">clie[·...·truncated·by·diffoscope;·len:·337,·SHA:·0ba39defb3a021a03637bf6afe8ad795cee90ddb9265e7d44df563761aafb86b·...·]-5">}</span><span·class="w">
281 ·····················</span><span·class="p"·data-group-id="9413750726-4">]</span><span·class="w">281 ·····················</span><span·class="p"·data-group-id="3195494955-4">]</span><span·class="w">
282 ················</span><span·class="p"·data-group-id="9413750726-3">}</span><span·class="w">282 ················</span><span·class="p"·data-group-id="3195494955-3">}</span><span·class="w">
283 ··············</span><span·class="p"·data-group-id="9413750726-2">]</span><span·class="p"·data-group-id="9413750726-1">)</span><span·class="p">.</span><span·class="w">283 ··············</span><span·class="p"·data-group-id="3195494955-2">]</span><span·class="p"·data-group-id="3195494955-1">)</span><span·class="p">.</span><span·class="w">
284 </span><span·class="p"·data-group-id="9413750726-9">[</span><span·class="p"·data-group-id="9413750726-10">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="9413750726-11">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdh-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">284 </span><span·class="p"·data-group-id="3195494955-9">[</span><span·class="p"·data-group-id="3195494955-10">{</span><span·class="ss">kex</span><span·class="p">,</span><span·class="p"·data-group-id="3195494955-11">[</span><span·class="ss">&#39;ecdh-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdh-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
285 ·······</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha256&#39;</span><span·class="p">,</span><span·class="w">285 ·······</span><span·class="ss">&#39;ecdh-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha256&#39;</span><span·class="p">,</span><span·class="w">
286 ·······</span><span·class="ss">&#39;diffie-hellman-group16-sha512&#39;</span><span·class="p">,</span><span·class="w">286 ·······</span><span·class="ss">&#39;diffie-hellman-group16-sha512&#39;</span><span·class="p">,</span><span·class="w">
287 ·······</span><span·class="ss">&#39;diffie-hellman-group18-sha512&#39;</span><span·class="p">,</span><span·class="w">287 ·······</span><span·class="ss">&#39;diffie-hellman-group18-sha512&#39;</span><span·class="p">,</span><span·class="w">
288 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p">,</span><span·class="w">288 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha256&#39;</span><span·class="p">,</span><span·class="w">
289 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha1&#39;</span><span·class="p">,</span><span·class="w">289 ·······</span><span·class="ss">&#39;diffie-hellman-group14-sha1&#39;</span><span·class="p">,</span><span·class="w">
290 ·······</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha1&#39;</span><span·class="p"·data-group-id="9413750726-11">]</span><span·class="p"·data-group-id="9413750726-10">}</span><span·class="p">,</span><span·class="w">290 ·······</span><span·class="ss">&#39;diffie-hellman-group-exchange-sha1&#39;</span><span·class="p"·data-group-id="3195494955-11">]</span><span·class="p"·data-group-id="3195494955-10">}</span><span·class="p">,</span><span·class="w">
291 ·</span><span·class="p"·data-group-id="9413750726-12">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="9413750726-13">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">291 ·</span><span·class="p"·data-group-id="3195494955-12">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="3195494955-13">[</span><span·class="ss">&#39;ecdsa-sha2-nistp384&#39;</span><span·class="p">,</span><span·class="ss">&#39;ecdsa-sha2-nistp521&#39;</span><span·class="p">,</span><span·class="w">
292 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">292 ··············</span><span·class="ss">&#39;ecdsa-sha2-nistp256&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span·class="ss">&#39;rsa-sha2-256&#39;</span><span·class="p">,</span><span·class="w">
293 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="9413750726-13">]</span><span·class="p"·data-group-id="9413750726-12">}</span><span·class="p">,</span><span·class="w">293 ··············</span><span·class="ss">&#39;rsa-sha2-512&#39;</span><span·class="p">,</span><span·class="ss">&#39;ssh-dss&#39;</span><span·class="p"·data-group-id="3195494955-13">]</span><span·class="p"·data-group-id="3195494955-12">}</span><span·class="p">,</span><span·class="w">
294 ·</span><span·class="p"·data-group-id="9413750726-14">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="9413750726-15">[</span><span·class="p"·data-group-id="9413750726-16">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·183,·SHA:·636f8f4277eb89ccd4a5d21cfcde46d8bc9673b6f61099c832106d00b744e3cf·...·]-16">}</span><span·class="p">,</span><span·class="w">294 ·</span><span·class="p"·data-group-id="3195494955-14">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="3195494955-15">[</span><span·class="p"·data-group-id="3195494955-16">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·183,·SHA:·bdba133e12c92093e911fc4247314e0e338616887071b11f0047208e4feefadb·...·]-16">}</span><span·class="p">,</span><span·class="w">
295 ··········</span><span·class="p"·data-group-id="9413750726-18">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="9413750726-19">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="w">295 ··········</span><span·class="p"·data-group-id="3195494955-18">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="3195494955-19">[</span><span·class="ss">&#39;aes256-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes256-ctr&#39;</span><span·class="p">,</span><span·class="w">
296 ··························</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="w">296 ··························</span><span·class="ss">&#39;aes192-ctr&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-gcm@openssh.com&#39;</span><span·class="p">,</span><span·class="ss">&#39;aes128-ctr&#39;</span><span·class="p">,</span><span·class="w">
297 ··························</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="9413750726-19">]</span><span·class="p"·data-group-id="9413750726-18">}</span><span·class="p"·data-group-id="9413750726-15">]</span><span·class="p"·data-group-id="9413750726-14">}</span><span·class="p">,</span><span·class="w">297 ··························</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·class="p"·data-group-id="3195494955-19">]</span><span·class="p"·data-group-id="3195494955-18">}</span><span·class="p"·data-group-id="3195494955-15">]</span><span·class="p"·data-group-id="3195494955-14">}</span><span·class="p">,</span><span·class="w">
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210 ··<span·class="text">Verifying·the·remote·client·in·a·daemon·(server)</span>210 ··<span·class="text">Verifying·the·remote·client·in·a·daemon·(server)</span>
211 </h2>211 </h2>
212 <ul><li><p><strong>Password·checking</strong>·-·The·default·password·checking·is·with·the·list·in·the212 <ul><li><p><strong>Password·checking</strong>·-·The·default·password·checking·is·with·the·list·in·the
213 <a·href="ssh.html#option-user_passwords">user_passwords</a>·option·in·the·SSH·daemon.·It213 <a·href="ssh.html#option-user_passwords">user_passwords</a>·option·in·the·SSH·daemon.·It
214 could·be·replaced·with·a·<a·href="ssh.html#option-pwdfun">pwdfun</a>·plugin.·The·arity214 could·be·replaced·with·a·<a·href="ssh.html#option-pwdfun">pwdfun</a>·plugin.·The·arity
215 four·variant·(<a·href="ssh.html#t:pwdfun_4/0"><code·class="inline">pwdfun_4()</code></a>)·can·also·be·used·for215 four·variant·(<a·href="ssh.html#t:pwdfun_4/0"><code·class="inline">pwdfun_4()</code></a>)·can·also·be·used·for
216 introducing·delays·after·failed·password·checking·attempts.·Here·is·a·simple216 introducing·delays·after·failed·password·checking·attempts.·Here·is·a·simple
217 example·of·such·a·pwdfun:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="8103082380-1">(</span><span·class="n">User</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Password</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">PeerAddress</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·95,·SHA:·faa6ba869c427d30a3b18cbad27f03ab86c0828b25ef8c06d6b050203b270db3·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">217 example·of·such·a·pwdfun:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="1295183566-1">(</span><span·class="n">User</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Password</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">PeerAddress</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·95,·SHA:·6ea17d444690027356b8b7450b5ed70857dd4a6cc56b19538ad60b987ad4b3f8·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
218 ········</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="8103082380-2">(</span><span·class="p"·data-group-id="8103082380-3">{</span><span·class="n">User</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="8103082380-3">}</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·185,·SHA:·c0e1d0c76b0055068b5f7e1a9fcb11a0e8a4c26b538e388b8f05796e483afb50·...·]-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">218 ········</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="1295183566-2">(</span><span·class="p"·data-group-id="1295183566-3">{</span><span·class="n">User</span><span·class="p">,</span><span·class="n">Password</span><span·class="p"·data-group-id="1295183566-3">}</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·185,·SHA:·ddd90ca70b3dd6627f6d102e4eb44e65fdaf4717125963664b57158df65da1db·...·]-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
219 ············</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 ············</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ················</span><span·class="p"·data-group-id="8103082380-5">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="8103082380-5">}</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·Reset·delay·time</span><span·class="w">220 ················</span><span·class="p"·data-group-id="1295183566-5">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="1295183566-5">}</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·Reset·delay·time</span><span·class="w">
221 ············</span><span·class="ss">false</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">State</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">221 ············</span><span·class="ss">false</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">State</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
222 ················</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">sleep</span><span·class="p"·data-group-id="8103082380-6">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="8103082380-6">)</span><span·class="p">,</span><span·class="w">222 ················</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">sleep</span><span·class="p"·data-group-id="1295183566-6">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="1295183566-6">)</span><span·class="p">,</span><span·class="w">
223 ················</span><span·class="p"·data-group-id="8103082380-7">{</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2000</span><span·class="p"·data-group-id="8103082380-7">}</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·Next·delay·is·2000·ms</span><span·class="w">223 ················</span><span·class="p"·data-group-id="1295183566-7">{</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2000</span><span·class="p"·data-group-id="1295183566-7">}</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·Next·delay·is·2000·ms</span><span·class="w">
224 ············</span><span·class="ss">false</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="8103082380-8">(</span><span·class="n">State</span><span·class="p"·data-group-id="8103082380-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">224 ············</span><span·class="ss">false</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_integer</span><span·class="p"·data-group-id="1295183566-8">(</span><span·class="n">State</span><span·class="p"·data-group-id="1295183566-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
225 ················</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">sleep</span><span·class="p"·data-group-id="8103082380-9">(</span><span·class="n">State</span><span·class="p"·data-group-id="8103082380-9">)</span><span·class="p">,</span><span·class="w">225 ················</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">sleep</span><span·class="p"·data-group-id="1295183566-9">(</span><span·class="n">State</span><span·class="p"·data-group-id="1295183566-9">)</span><span·class="p">,</span><span·class="w">
226 ················</span><span·class="p"·data-group-id="8103082380-10">{</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="o">*</span><span·class="n">State</span><span·class="p"·data-group-id="8103082380-10">}</span><span·class="w">·</span><span·class="c1">%·Double·the·delay·for·each·failure</span><span·class="w">226 ················</span><span·class="p"·data-group-id="1295183566-10">{</span><span·class="ss">false</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="o">*</span><span·class="n">State</span><span·class="p"·data-group-id="1295183566-10">}</span><span·class="w">·</span><span·class="c1">%·Double·the·delay·for·each·failure</span><span·class="w">
227 ········</span><span·class="k">end</span><span·class="w">227 ········</span><span·class="k">end</span><span·class="w">
228 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>If·a·public·key·is·used·for·logging·in,·there·is·normally·no·checking·of·the228 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>If·a·public·key·is·used·for·logging·in,·there·is·normally·no·checking·of·the
229 user·name.·It·could·be·enabled·by·setting·the·option229 user·name.·It·could·be·enabled·by·setting·the·option
230 <a·href="ssh.html#option-pk_check_user"><code·class="inline">pk_check_user</code></a>·to·<code·class="inline">true</code>.·In·that·case·the230 <a·href="ssh.html#option-pk_check_user"><code·class="inline">pk_check_user</code></a>·to·<code·class="inline">true</code>.·In·that·case·the
231 pwdfun·will·get·the·atom·<code·class="inline">pubkey</code>·in·the·password·argument.</p></li></ul><h2·id="hardening-in-the-cryptographic-area"·class="section-heading">231 pwdfun·will·get·the·atom·<code·class="inline">pubkey</code>·in·the·password·argument.</p></li></ul><h2·id="hardening-in-the-cryptographic-area"·class="section-heading">
232 ··<a·href="#hardening-in-the-cryptographic-area"·class="hover-link">232 ··<a·href="#hardening-in-the-cryptographic-area"·class="hover-link">
233 ····<i·class="ri-link-m"·aria-hidden="true"></i>233 ····<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 288, 15 lines modifiedOffset 288, 15 lines modified
288 ··<span·class="text">The·id·string</span>288 ··<span·class="text">The·id·string</span>
289 </h3>289 </h3>
290 <p>One·way·to·reduce·the·risk·of·intrusion·is·to·not·convey·which·software·and290 <p>One·way·to·reduce·the·risk·of·intrusion·is·to·not·convey·which·software·and
291 which·version·the·intruder·is·connected·to.·This·limits·the·risk·of·an·intruder291 which·version·the·intruder·is·connected·to.·This·limits·the·risk·of·an·intruder
292 exploiting·known·faults·or·peculiarities·learned·by·reading·the·public·code.</p><p>Each·SSH·client·or·daemon·presents·themselves·to·each·other·with·brand·and292 exploiting·known·faults·or·peculiarities·learned·by·reading·the·public·code.</p><p>Each·SSH·client·or·daemon·presents·themselves·to·each·other·with·brand·and
293 version.·This·may·look·like</p><pre><code·class="text">SSH-2.0-Erlang/4.10</code></pre><p>or</p><pre><code·class="text">SSH-2.0-OpenSSH_7.6p1·Ubuntu-4ubuntu0.3</code></pre><p>This·brand·and·version·may·be·changed·with·the·option293 version.·This·may·look·like</p><pre><code·class="text">SSH-2.0-Erlang/4.10</code></pre><p>or</p><pre><code·class="text">SSH-2.0-OpenSSH_7.6p1·Ubuntu-4ubuntu0.3</code></pre><p>This·brand·and·version·may·be·changed·with·the·option
294 <a·href="ssh.html#t:id_string_common_option/0">id_string</a>.·We·start·a·daemon·with·that294 <a·href="ssh.html#t:id_string_common_option/0">id_string</a>.·We·start·a·daemon·with·that
295 option:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">daemon</span><span·class="p"·data-group-id="5929646855-1">(</span><span·class="mi">1234</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5929646855-2">[</span><span·class="p"·data-group-id="5929646855-3">{</span><span·class="ss">id_string</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·339,·SHA:·d239a51b7fb274a85d9f121e7fd35ec2c27dc87578cdcdb9cc5f826f6b363d69·...·]-1">)</span><span·class="p">.</span></code></pre><p>and·the·daemon·will·present·itself·as:</p><pre><code·class="text">SSH-2.0-hi·there</code></pre><p>It·is·possible·to·replace·the·string·with·one·randomly·generated·for·each295 option:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">daemon</span><span·class="p"·data-group-id="7864800938-1">(</span><span·class="mi">1234</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7864800938-2">[</span><span·class="p"·data-group-id="7864800938-3">{</span><span·class="ss">id_string</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·339,·SHA:·87a1bccdba06f202c70751cf25d398fd897c25d7ef73a92067f67e50500fc7ff·...·]-1">)</span><span·class="p">.</span></code></pre><p>and·the·daemon·will·present·itself·as:</p><pre><code·class="text">SSH-2.0-hi·there</code></pre><p>It·is·possible·to·replace·the·string·with·one·randomly·generated·for·each
296 connection·attempt.·See·the·reference·manual·for296 connection·attempt.·See·the·reference·manual·for
297 <a·href="ssh.html#t:id_string_common_option/0">id_string</a>.</p><h2·id="client-connection-options"·class="section-heading">297 <a·href="ssh.html#t:id_string_common_option/0">id_string</a>.</p><h2·id="client-connection-options"·class="section-heading">
298 ··<a·href="#client-connection-options"·class="hover-link">298 ··<a·href="#client-connection-options"·class="hover-link">
299 ····<i·class="ri-link-m"·aria-hidden="true"></i>299 ····<i·class="ri-link-m"·aria-hidden="true"></i>
300 ··</a>300 ··</a>
301 ··<span·class="text">Client·connection·options</span>301 ··<span·class="text">Client·connection·options</span>
302 </h2>302 </h2>
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342 ······<p·class="built-using">342 ······<p·class="built-using">
343 ········Built·using343 ········Built·using
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346 ······</p>346 ······</p>
347 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>347 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
348 ····</footer>348 ····</footer>
349 ··</div>349 ··</div>
350 </main>350 </main>
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352 <script>352 <script>
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272 ······</p>272 ······</p>
273 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>273 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
274 ····</footer>274 ····</footer>
275 ··</div>275 ··</div>
276 </main>276 </main>
277 </div>277 </div>
278 <script>278 <script>
279 ··function·mermaidLoaded()·{279 ··function·mermaidLoaded()·{
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3414 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>3414 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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149 </main>149 </main>
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3369 ··········<pre·translate="no"><span·class="attribute">-type</span>·double_algs(AlgType)·::·[{client2server,·[AlgType]}·|·{server2client,·[AlgType]}]·|·[AlgType].</pre>3369 ··········<pre·translate="no"><span·class="attribute">-type</span>·double_algs(AlgType)·::·[{client2server,·[AlgType]}·|·{server2client,·[AlgType]}]·|·[AlgType].</pre>
  
3370 ······</div>3370 ······</div>
  
3371 <p>List·of·algorithms·to·use·in·the·algorithm·negotiation.·The·default3371 <p>List·of·algorithms·to·use·in·the·algorithm·negotiation.·The·default
3372 <a·href="#t:algs_list/0"><code·class="inline">algs_list/0</code></a>·can·be·obtained·from·<a·href="#default_algorithms/0"><code·class="inline">default_algorithms/0</code></a>.</p><p>If·an·alg_entry()·is·missing·in·the·algs_list(),·the·default·value·is·used·for3372 <a·href="#t:algs_list/0"><code·class="inline">algs_list/0</code></a>·can·be·obtained·from·<a·href="#default_algorithms/0"><code·class="inline">default_algorithms/0</code></a>.</p><p>If·an·alg_entry()·is·missing·in·the·algs_list(),·the·default·value·is·used·for
3373 that·entry.</p><p>Here·is·an·example·of·this·option:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»  ··</span><span·class="p"·data-group-id="2171486859-1">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">3373 that·entry.</p><p>Here·is·an·example·of·this·option:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">»  ··</span><span·class="p"·data-group-id="9426793638-1">{</span><span·class="ss">preferred_algorithms</span><span·class="p">,</span><span·class="w">
3374 »       ··</span><span·class="p"·data-group-id="2171486859-2">[</span><span·class="p"·data-group-id="2171486859-3">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="2171486859-4">[</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·130,·SHA:·f1dd172a0e61be7a567938ad8493b31583357d6d4fede1621587a3145f4f6edd·...·]-3">}</span><span·class="p">,</span><span·class="w">3374 »       ··</span><span·class="p"·data-group-id="9426793638-2">[</span><span·class="p"·data-group-id="9426793638-3">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="p"·data-group-id="9426793638-4">[</span><span·class="ss">&#39;ssh-rsa&#39;</span><span·class="p">,</span><span[·...·truncated·by·diffoscope;·len:·130,·SHA:·12ba112e15824522a2cb23735967b82c5b5189e36ff2e145d571c40ab2045fd9·...·]-3">}</span><span·class="p">,</span><span·class="w">
3375 »       ··</span><span·class="p"·data-group-id="2171486859-5">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="2171486859-6">[</span><span·class="p"·data-group-id="2171486859-7">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·178,·SHA:·5ab2d4700fb2d2f0d2af0e4c18912e9d88d93dbe6d8e7bbb87f97f0a3dc210aa·...·]-7">}</span><span·class="p">,</span><span·class="w">3375 »       ··</span><span·class="p"·data-group-id="9426793638-5">{</span><span·class="ss">cipher</span><span·class="p">,</span><span·class="p"·data-group-id="9426793638-6">[</span><span·class="p"·data-group-id="9426793638-7">{</span><span·class="ss">client2server</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·178,·SHA:·b48af17f4af0cd882b83d21ab86c0846c5f2608902d63b22463a1d5357d24ea3·...·]-7">}</span><span·class="p">,</span><span·class="w">
3376 ··········</span><span·class="p"·data-group-id="2171486859-9">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="2171486859-10">[</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·cla[·...·truncated·by·diffoscope;·len:·192,·SHA:·2aa27041b528b3ebbc80a19cba32b97b2f031b1d7210815a8acd1768989b4573·...·]-5">}</span><span·class="p">,</span><span·class="w">3376 ··········</span><span·class="p"·data-group-id="9426793638-9">{</span><span·class="ss">server2client</span><span·class="p">,</span><span·class="p"·data-group-id="9426793638-10">[</span><span·class="ss">&#39;aes128-cbc&#39;</span><span·class="p">,</span><span·class="ss">&#39;3des-cbc&#39;</span><span·cla[·...·truncated·by·diffoscope;·len:·192,·SHA:·bad6ba00f79d838dda2fe9bbcabe0230c643efeec282e9cfb3eef16953b99d13·...·]-5">}</span><span·class="p">,</span><span·class="w">
3377 »       ··</span><span·class="p"·data-group-id="2171486859-11">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="2171486859-12">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p[·...·truncated·by·diffoscope;·len:·81,·SHA:·b1d4db88edb6e6fe558f298ae80c00ba3c088409813fb402a2518a06d89d563b·...·]-11">}</span><span·class="p">,</span><span·class="w">3377 »       ··</span><span·class="p"·data-group-id="9426793638-11">{</span><span·class="ss">mac</span><span·class="p">,</span><span·class="p"·data-group-id="9426793638-12">[</span><span·class="ss">&#39;hmac-sha2-256&#39;</span><span·class="p">,</span><span·class="ss">&#39;hmac-sha1&#39;</span><span·class="p[·...·truncated·by·diffoscope;·len:·81,·SHA:·8b9d02d92f3380b74d0f3c88a916556b996052a9ffa4940da70b489e572c8c1d·...·]-11">}</span><span·class="p">,</span><span·class="w">
3378 »       ··</span><span·class="p"·data-group-id="2171486859-13">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="2171486859-14">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="217148685[·...·truncated·by·diffoscope;·len:·55,·SHA:·c0d7f8dc3d77aee97eca7f500d6f465c78a39bbf98b2c2c5dd223b4b793feaaa·...·]-13">}</span><span·class="w">3378 »       ··</span><span·class="p"·data-group-id="9426793638-13">{</span><span·class="ss">compression</span><span·class="p">,</span><span·class="p"·data-group-id="9426793638-14">[</span><span·class="ss">none</span><span·class="p">,</span><span·class="ss">zlib</span><span·class="p"·data-group-id="942679363[·...·truncated·by·diffoscope;·len:·55,·SHA:·f29e4dcabce867cc8cc3d14b4ebb179c806cd130b852fc276027ff18ad5f25fd·...·]-13">}</span><span·class="w">
3379 »       ··</span><span·class="p"·data-group-id="2171486859-2">]</span><span·class="w">3379 »       ··</span><span·class="p"·data-group-id="9426793638-2">]</span><span·class="w">
3380 »       ··</span><span·class="p"·data-group-id="2171486859-1">}</span></code></pre><p>The·example·specifies·different·algorithms·in·the·two·directions·(client2server3380 »       ··</span><span·class="p"·data-group-id="9426793638-1">}</span></code></pre><p>The·example·specifies·different·algorithms·in·the·two·directions·(client2server
3381 and·server2client),·for·cipher·but·specifies·the·same·algorithms·for·mac·and3381 and·server2client),·for·cipher·but·specifies·the·same·algorithms·for·mac·and
3382 compression·in·both·directions.·The·kex·(key·exchange)·is·implicit·but3382 compression·in·both·directions.·The·kex·(key·exchange)·is·implicit·but
3383 public_key·is·set·explicitly.</p><p>For·background·and·more·examples·see·the3383 public_key·is·set·explicitly.</p><p>For·background·and·more·examples·see·the
3384 <a·href="configure_algos.html#introduction">User's·Guide</a>.</p><p>If·an·algorithm·name·occurs·more·than·once·in·a·list,·the·behaviour·is3384 <a·href="configure_algos.html#introduction">User's·Guide</a>.</p><p>If·an·algorithm·name·occurs·more·than·once·in·a·list,·the·behaviour·is
3385 undefined.·The·tags·in·the·property·lists·are·also·assumed·to·occur·at·most·one3385 undefined.·The·tags·in·the·property·lists·are·also·assumed·to·occur·at·most·one
3386 time.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Changing·the·values·can·make·a·connection·less·secure.·Do·not·change·unless3386 time.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Changing·the·values·can·make·a·connection·less·secure.·Do·not·change·unless
3387 you·know·exactly·what·you·are·doing.·If·you·do·not·understand·the·values·then3387 you·know·exactly·what·you·are·doing.·If·you·do·not·understand·the·values·then
Offset 5105, 29 lines modifiedOffset 5105, 29 lines modified
5105 ·································StringOrString·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()].</pre>5105 ·································StringOrString·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()·|·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()].</pre>
  
5106 ······</div>5106 ······</div>
  
5107 <p>hostkey_fingerprint([DigestType],·HostKey)·-&gt;5107 <p>hostkey_fingerprint([DigestType],·HostKey)·-&gt;
5108 [string()]hostkey_fingerprint(DigestType,·HostKey)·-&gt;·string()</p><p>Calculates·a·ssh·fingerprint·from·a·public·host·key·as·openssh·does.</p><p>The·algorithm·in·<a·href="#hostkey_fingerprint/1"><code·class="inline">hostkey_fingerprint/1</code></a>·is·md5·to·be5108 [string()]hostkey_fingerprint(DigestType,·HostKey)·-&gt;·string()</p><p>Calculates·a·ssh·fingerprint·from·a·public·host·key·as·openssh·does.</p><p>The·algorithm·in·<a·href="#hostkey_fingerprint/1"><code·class="inline">hostkey_fingerprint/1</code></a>·is·md5·to·be
5109 compatible·with·older·ssh-keygen·commands.·The·string·from·the·second·variant·is5109 compatible·with·older·ssh-keygen·commands.·The·string·from·the·second·variant·is
5110 prepended·by·the·algorithm·name·in·uppercase·as·in·newer·ssh-keygen·commands.</p><p>Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="7453374645-1">(</span><span·class="n">Key</span><span·class="p"·data-group-id="7453374645-1">)</span><span·class="p">.</span><span·class="w">5110 prepended·by·the·algorithm·name·in·uppercase·as·in·newer·ssh-keygen·commands.</p><p>Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="3704215856-1">(</span><span·class="n">Key</span><span·class="p"·data-group-id="3704215856-1">)</span><span·class="p">.</span><span·class="w">
5111 ·</span><span·class="s">&quot;f5:64:a6:c1:5a:cb:9f:0a:10:46:a2:5c:3e:2f:57:84&quot;</span><span·class="w">5111 ·</span><span·class="s">&quot;f5:64:a6:c1:5a:cb:9f:0a:10:46:a2:5c:3e:2f:57:84&quot;</span><span·class="w">
  
5112 ·</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="7453374645-2">(</span><span·class="nb">md5</span><span·class="p">,</span><span·class="n">Key</span><span·class="p"·data-group-id="7453374645-2">)</span><span·class="p">.</span><span·class="w">5112 ·</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="3704215856-2">(</span><span·class="nb">md5</span><span·class="p">,</span><span·class="n">Key</span><span·class="p"·data-group-id="3704215856-2">)</span><span·class="p">.</span><span·class="w">
5113 ·</span><span·class="s">&quot;MD5:f5:64:a6:c1:5a:cb:9f:0a:10:46:a2:5c:3e:2f:57:84&quot;</span><span·class="w">5113 ·</span><span·class="s">&quot;MD5:f5:64:a6:c1:5a:cb:9f:0a:10:46:a2:5c:3e:2f:57:84&quot;</span><span·class="w">
  
5114 ·</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="7453374645-3">(</span><span·class="ss">sha</span><span·class="p">,</span><span·class="n">Key</span><span·class="p"·data-group-id="7453374645-3">)</span><span·class="p">.</span><span·class="w">5114 ·</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="3704215856-3">(</span><span·class="ss">sha</span><span·class="p">,</span><span·class="n">Key</span><span·class="p"·data-group-id="3704215856-3">)</span><span·class="p">.</span><span·class="w">
5115 ·</span><span·class="s">&quot;SHA1:bSLY/C4QXLDL/Iwmhyg0PGW9UbY&quot;</span><span·class="w">5115 ·</span><span·class="s">&quot;SHA1:bSLY/C4QXLDL/Iwmhyg0PGW9UbY&quot;</span><span·class="w">
  
5116 ·</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="7453374645-4">(</span><span·class="ss">sha256</span><span·class="p">,</span><span·class="n">Key</span><span·class="p"·data-group-id="7453374645-4">)</span><span·class="p">.</span><span·class="w">5116 ·</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="3704215856-4">(</span><span·class="ss">sha256</span><span·class="p">,</span><span·class="n">Key</span><span·class="p"·data-group-id="3704215856-4">)</span><span·class="p">.</span><span·class="w">
5117 ·</span><span·class="s">&quot;SHA256:aZGXhabfbf4oxglxltItWeHU7ub3Dc31NcNw2cMJePQ&quot;</span><span·class="w">5117 ·</span><span·class="s">&quot;SHA256:aZGXhabfbf4oxglxltItWeHU7ub3Dc31NcNw2cMJePQ&quot;</span><span·class="w">
  
5118 ·</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="7453374645-5">(</span><span·class="p"·data-group-id="7453374645-6">[</span><span·class="ss">sha</span><span·class="p">,</span><span·class="ss">sha256</span><span·class="p"·data-group-id="7453374645-6">]</span><span·class="p">,</span><span·class="n">Key</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·54023b0e32827c8ed73e60a6c5e92283c9be2c64fcfcac115dfc9d480f8669e5·...·]-5">)</span><span·class="p">.</span><span·class="w">5118 ·</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">ssh</span><span·class="p">:</span><span·class="nf">hostkey_fingerprint</span><span·class="p"·data-group-id="3704215856-5">(</span><span·class="p"·data-group-id="3704215856-6">[</span><span·class="ss">sha</span><span·class="p">,</span><span·class="ss">sha256</span><span·class="p"·data-group-id="3704215856-6">]</span><span·class="p">,</span><span·class="n">Key</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·0c3529a10f7f79b2706dc6ab0a1b4def25e19cdc51d9574669f469b517212fb3·...·]-5">)</span><span·class="p">.</span><span·class="w">
5119 ·</span><span·class="p"·data-group-id="7453374645-7">[</span><span·class="s">&quot;SHA1:bSLY/C4QXLDL/Iwmhyg0PGW9UbY&quot;</span><span·class="p">,</span><span·class="w">5119 ·</span><span·class="p"·data-group-id="3704215856-7">[</span><span·class="s">&quot;SHA1:bSLY/C4QXLDL/Iwmhyg0PGW9UbY&quot;</span><span·class="p">,</span><span·class="w">
5120 ··</span><span·class="s">&quot;SHA256:aZGXhabfbf4oxglxltItWeHU7ub3Dc31NcNw2cMJePQ&quot;</span><span·class="p"·data-group-id="7453374645-7">]</span></code></pre>5120 ··</span><span·class="s">&quot;SHA256:aZGXhabfbf4oxglxltItWeHU7ub3Dc31NcNw2cMJePQ&quot;</span><span·class="p"·data-group-id="3704215856-7">]</span></code></pre>
5121 ··</section>5121 ··</section>
5122 </section>5122 </section>
5123 <section·class="detail"·id="set_sock_opts/2">5123 <section·class="detail"·id="set_sock_opts/2">
  
5124 ··<div·class="detail-header">5124 ··<div·class="detail-header">
5125 ····<a·href="#set_sock_opts/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">5125 ····<a·href="#set_sock_opts/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
5126 ······<i·class="ri-link-m"·aria-hidden="true"></i>5126 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 5668, 15 lines modifiedOffset 5668, 15 lines modified
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5669 ········Built·using5669 ········Built·using
5670 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the5670 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
5671 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>5671 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
5672 ······</p>5672 ······</p>
5673 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>5673 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
5674 ····</footer>5674 ····</footer>
5675 ··</div>5675 ··</div>
5676 </main>5676 </main>
5677 </div>5677 </div>
5678 <script>5678 <script>
5679 ··function·mermaidLoaded()·{5679 ··function·mermaidLoaded()·{
5680 ····mermaid.initialize({5680 ····mermaid.initialize({
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131 <p>Callback·module·for·using·an·SSH·agent·instead·of·the·default·ssh_file·callback.</p><p>This·module·defines·a·callback·handler·for·the·communication·with·an131 <p>Callback·module·for·using·an·SSH·agent·instead·of·the·default·ssh_file·callback.</p><p>This·module·defines·a·callback·handler·for·the·communication·with·an
132 <a·href="https://tools.ietf.org/html/draft-miller-ssh-agent-02">SSH·Agent</a>·and·can·be132 <a·href="https://tools.ietf.org/html/draft-miller-ssh-agent-02">SSH·Agent</a>·and·can·be
133 used·to·replace·the·<a·href="ssh_file.html">default·callback</a>.·This·allows·to·issue133 used·to·replace·the·<a·href="ssh_file.html">default·callback</a>.·This·allows·to·issue
134 signing·requests·to·an·agent·that·stores·SSH·private·keys·to·perform134 signing·requests·to·an·agent·that·stores·SSH·private·keys·to·perform
135 authentication.</p><p>Ssh_agent·implements·the·<a·href="ssh_client_key_api.html"><code·class="inline">ssh_client_key_api</code></a>,·to·allow·it·to·be·used·by135 authentication.</p><p>Ssh_agent·implements·the·<a·href="ssh_client_key_api.html"><code·class="inline">ssh_client_key_api</code></a>,·to·allow·it·to·be·used·by
136 setting·the·option·<a·href="ssh.html#t:key_cb_common_option/0"><code·class="inline">key_cb</code></a>·when·starting·a136 setting·the·option·<a·href="ssh.html#t:key_cb_common_option/0"><code·class="inline">key_cb</code></a>·when·starting·a
137 client·(with·for·example·<a·href="ssh.html#connect/3">ssh:connect</a>,137 client·(with·for·example·<a·href="ssh.html#connect/3">ssh:connect</a>,
138 <a·href="ssh.html#shell/1">ssh:shell</a>·).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="1499119134-1">{</span><span·class="ss">key_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1499119134-2">{</span><span·class="ss">ssh_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·178,·SHA:·7e788fe2ab5598b2503ef53fe2ed6559d5afef5ce7399c0ce3ab6093a5feb65e·...·]-1">}</span></code></pre><p>The·agent·communication·is·established·through·a·UNIX·domain·socket.·By·default,138 <a·href="ssh.html#shell/1">ssh:shell</a>·).</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="9978841900-1">{</span><span·class="ss">key_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9978841900-2">{</span><span·class="ss">ssh_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·178,·SHA:·a2b5e00dbe589c2603190401892cfe97e89ab656e5acf601bbde8db70698df88·...·]-1">}</span></code></pre><p>The·agent·communication·is·established·through·a·UNIX·domain·socket.·By·default,
139 the·socket·path·will·be·fetched·from·the·<code·class="inline">SSH_AUTH_SOCK</code>·environment·variable,139 the·socket·path·will·be·fetched·from·the·<code·class="inline">SSH_AUTH_SOCK</code>·environment·variable,
140 which·is·the·default·socket·path·in·the·agent·implementation·of140 which·is·the·default·socket·path·in·the·agent·implementation·of
141 <a·href="http://www.openssh.com">OpenSSH</a>.</p><p><a·href=""·id="SOCKET_PATH"></a>·In·order·to·set·a·different·socket·path·the·<code·class="inline">socket_path</code>141 <a·href="http://www.openssh.com">OpenSSH</a>.</p><p><a·href=""·id="SOCKET_PATH"></a>·In·order·to·set·a·different·socket·path·the·<code·class="inline">socket_path</code>
142 option·can·be·set.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="1992868535-1">{</span><span·class="ss">key_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1992868535-2">{</span><span·class="ss">ssh_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·400,·SHA:·d2576781a6d3f078d36163b2180c05dbf24fda10fbc58805d68638886056742e·...·]-1">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·functions·are·<em>Callbacks</em>·for·the·SSH·app.·They·are·not·intended·to·be142 option·can·be·set.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="2484371911-1">{</span><span·class="ss">key_cb</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2484371911-2">{</span><span·class="ss">ssh_agent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·400,·SHA:·b3f7900242f134a79330bec2f9d5f1c85193569eb62fe82d217d815f4eb4a0da·...·]-1">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·functions·are·<em>Callbacks</em>·for·the·SSH·app.·They·are·not·intended·to·be
143 called·from·the·user's·code!</p></section>143 called·from·the·user's·code!</p></section>
144 ····</section>144 ····</section>
  
145 </div>145 </div>
  
146 ··<section·id="summary"·class="details-list">146 ··<section·id="summary"·class="details-list">
147 ····<h1·class="section-heading">147 ····<h1·class="section-heading">
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548 ········Built·using548 ········Built·using
549 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the549 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
550 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>550 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
551 ······</p>551 ······</p>
552 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>552 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
553 ····</footer>553 ····</footer>
554 ··</div>554 ··</div>
555 </main>555 </main>
556 </div>556 </div>
557 <script>557 <script>
558 ··function·mermaidLoaded()·{558 ··function·mermaidLoaded()·{
559 ····mermaid.initialize({559 ····mermaid.initialize({
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348 ········Built·using348 ········Built·using
349 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the349 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
350 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>350 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
351 ······</p>351 ······</p>
352 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>352 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
353 ····</footer>353 ····</footer>
354 ··</div>354 ··</div>
355 </main>355 </main>
356 </div>356 </div>
357 <script>357 <script>
358 ··function·mermaidLoaded()·{358 ··function·mermaidLoaded()·{
359 ····mermaid.initialize({359 ····mermaid.initialize({
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957 ········Built·using957 ········Built·using
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959 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>959 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
960 ······</p>960 ······</p>
961 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>961 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
962 ····</footer>962 ····</footer>
963 ··</div>963 ··</div>
964 </main>964 </main>
965 </div>965 </div>
966 <script>966 <script>
967 ··function·mermaidLoaded()·{967 ··function·mermaidLoaded()·{
968 ····mermaid.initialize({968 ····mermaid.initialize({
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526 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>526 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
527 ······</p>527 ······</p>
528 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>528 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
529 ····</footer>529 ····</footer>
530 ··</div>530 ··</div>
531 </main>531 </main>
532 </div>532 </div>
533 <script>533 <script>
534 ··function·mermaidLoaded()·{534 ··function·mermaidLoaded()·{
535 ····mermaid.initialize({535 ····mermaid.initialize({
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1940 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1940 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1941 ······</p>1941 ······</p>
1942 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1942 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1943 ····</footer>1943 ····</footer>
1944 ··</div>1944 ··</div>
1945 </main>1945 </main>
1946 </div>1946 </div>
1947 <script>1947 <script>
1948 ··function·mermaidLoaded()·{1948 ··function·mermaidLoaded()·{
1949 ····mermaid.initialize({1949 ····mermaid.initialize({
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1006 ······</p>1006 ······</p>
1007 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1007 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1008 ····</footer>1008 ····</footer>
1009 ··</div>1009 ··</div>
1010 </main>1010 </main>
1011 </div>1011 </div>
1012 <script>1012 <script>
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127 ··</h1>127 ··</h1>
  
  
128 ····<section·id="moduledoc">128 ····<section·id="moduledoc">
129 <p>Interface·functions·for·TLS·(Transport·Layer·Security)129 <p>Interface·functions·for·TLS·(Transport·Layer·Security)
130 and·DTLS·(Datagram·Transport·Layer·Security).</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·application's·name·is·still·SSL·because·the·first·versions·of·the130 and·DTLS·(Datagram·Transport·Layer·Security).</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·application's·name·is·still·SSL·because·the·first·versions·of·the
131 TLS·protocol·were·named·SSL·(Secure·Socket·Layer).·However,·no·version131 TLS·protocol·were·named·SSL·(Secure·Socket·Layer).·However,·no·version
132 of·the·old·SSL·protocol·is·supported·by·this·application.</p></section><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ssl</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9416257976-1">(</span><span·class="p"·data-group-id="9416257976-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ssl</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="9416257976-2">(</span><span·class="s">&quot;google.com&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">443</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9416257976-3">[</span><span·class="p"·data-group-id="9416257976-4">{</span><span·class="ss">verify</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">verify_peer</span><span·class="p"·data-group-id="9416257976-4">}</span><span·class="p">,</span><span·class="w"> 
133 ····</span><span·class="p"·data-group-id="9416257976-5">{</span><span·class="ss">cacerts</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">public_key</span><span·class="p">:</span><span·class="nf">cacerts_get</span><span·class="p"·data-group-id="9416257976-6">(</span><span·class="p"·data-group-id="9416257976-6">)</span><span·class="p"·data-group-id="9416257976-5">}</span><span·class="p"·data-group-id="9416257976-3">]</span><span·class="p"·data-group-id="9416257976-2">)</span><span·class="p">.</span><span·class="w"> 
134 </span><span·class="p"·data-group-id="9416257976-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="9416257976-8">{</span><span·class="ss">sslsocket</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·369,·SHA:·2dc6b1772c5da019b8348dcb2df1c29ec0b5c7c06cc2ce641a57a3b6b80e145b·...·]132 of·the·old·SSL·protocol·is·supported·by·this·application.</p></section><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ssl</span><span·class="p">:</span><span·class="nf">start</span[·...·truncated·by·diffoscope;·len:·770,·SHA:·afa2dcfc214c5db80cf9de4e987c2756d5543760dbd9029340b693ac5143a562·...·]
 133 ····</span><span·class="p"·data-group-id="7350984977-5">{</span><span·class="ss">cacerts</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">public_key</span><span·class="p">:</span><span·class="nf">cacerts_get</span><span·class="p"·data-group-id="7350984977-6">(</span><span·class="p"·data-group-id="7350984977-6">)</span><span·class="p"·data-group-id="7350984977-5">}</span><span·class="p"·data-group-id="7350984977-3">]</span><span·class="p"·data-group-id="7350984977-2">)</span><span·class="p">.</span><span·class="w">
 134 </span><span·class="p"·data-group-id="7350984977-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7350984977-8">{</span><span·class="ss">sslsocket</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7350984977-9">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7350984977-9">]</span><span·class="p"·data-group-id="7350984977-8">}</span><span·class="p"·data-group-id="7350984977-7">}</span></code></pre><p>See·<a·href="using_ssl.html">Examples</a>·for·detailed·usage·and·more·examples·of
135 this·API.</p><p>Special·Erlang·node·configuration·for·the·application·can·be·found·in135 this·API.</p><p>Special·Erlang·node·configuration·for·the·application·can·be·found·in
136 <a·href="ssl_app.html">SSL·Application</a>.</p>136 <a·href="ssl_app.html">SSL·Application</a>.</p>
137 ····</section>137 ····</section>
  
138 </div>138 </div>
  
139 ··<section·id="summary"·class="details-list">139 ··<section·id="summary"·class="details-list">
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2487 from·the·cipher·suite.</p><p>In·TLS-1.2·a·somewhat·more·explicit·negotiation·is·made·possible·using·a·list·of2487 from·the·cipher·suite.</p><p>In·TLS-1.2·a·somewhat·more·explicit·negotiation·is·made·possible·using·a·list·of
2488 <code·class="inline">{HashAlgo,·SignAlgo}</code>·tuples.</p><p>In·TLS-1.3,·these·algorithm·pairs·are·replaced·by·<a·href="#t:sign_scheme/0">signature2488 <code·class="inline">{HashAlgo,·SignAlgo}</code>·tuples.</p><p>In·TLS-1.3,·these·algorithm·pairs·are·replaced·by·<a·href="#t:sign_scheme/0">signature
2489 schemes</a>·that·are·completely·decoupled·from·the2489 schemes</a>·that·are·completely·decoupled·from·the
2490 cipher·suite.</p><p>Signature·algorithms·used·for·certificates·can·be·overridden·by·the2490 cipher·suite.</p><p>Signature·algorithms·used·for·certificates·can·be·overridden·by·the
2491 <a·href="#t:sign_scheme/0">signature·schemes</a>·supplied·by·the2491 <a·href="#t:sign_scheme/0">signature·schemes</a>·supplied·by·the
2492 <code·class="inline">signature_algs_cert</code>·option.</p><p>The·TLS-1.2·default·is·<code·class="inline">Default_TLS_12_Alg_Pairs</code>·interleaved·with2492 <code·class="inline">signature_algs_cert</code>·option.</p><p>The·TLS-1.2·default·is·<code·class="inline">Default_TLS_12_Alg_Pairs</code>·interleaved·with
2493 <code·class="inline">rsa_pss_schemes</code>·since·ssl-11.0·(Erlang/OTP·25).·<code·class="inline">pss_pss</code>·is2493 <code·class="inline">rsa_pss_schemes</code>·since·ssl-11.0·(Erlang/OTP·25).·<code·class="inline">pss_pss</code>·is
2494 preferred·over·<code·class="inline">pss_rsae</code>,·which·in·turn·is·preferred·over·<code·class="inline">rsa</code>.</p><p>The·list·for·<code·class="inline">Default_TLS_12_Alg_Pairs</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0887145746-1">[</span><span·class="w">2494 preferred·over·<code·class="inline">pss_rsae</code>,·which·in·turn·is·preferred·over·<code·class="inline">rsa</code>.</p><p>The·list·for·<code·class="inline">Default_TLS_12_Alg_Pairs</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6314026873-1">[</span><span·class="w">
2495 </span><span·class="p"·data-group-id="0887145746-2">{</span><span·class="ss">sha512</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ecdsa</span><span·class="p"·data-group-id="0887145746-2">}</span><span·class="p">,</span><span·class="w">2495 </span><span·class="p"·data-group-id="6314026873-2">{</span><span·class="ss">sha512</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ecdsa</span><span·class="p"·data-group-id="6314026873-2">}</span><span·class="p">,</span><span·class="w">
2496 </span><span·class="p"·data-group-id="0887145746-3">{</span><span·class="ss">sha512</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rsa</span><span·class="p"·data-group-id="0887145746-3">}</span><span·class="p">,</span><span·class="w">2496 </span><span·class="p"·data-group-id="6314026873-3">{</span><span·class="ss">sha512</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rsa</span><span·class="p"·data-group-id="6314026873-3">}</span><span·class="p">,</span><span·class="w">
2497 </span><span·class="p"·data-group-id="0887145746-4">{</span><span·class="ss">sha384</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ecdsa</span><span·class="p"·data-group-id="0887145746-4">}</span><span·class="p">,</span><span·class="w">2497 </span><span·class="p"·data-group-id="6314026873-4">{</span><span·class="ss">sha384</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ecdsa</span><span·class="p"·data-group-id="6314026873-4">}</span><span·class="p">,</span><span·class="w">
2498 </span><span·class="p"·data-group-id="0887145746-5">{</span><span·class="ss">sha384</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rsa</span><span·class="p"·data-group-id="0887145746-5">}</span><span·class="p">,</span><span·class="w">2498 </span><span·class="p"·data-group-id="6314026873-5">{</span><span·class="ss">sha384</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rsa</span><span·class="p"·data-group-id="6314026873-5">}</span><span·class="p">,</span><span·class="w">
2499 </span><span·class="p"·data-group-id="0887145746-6">{</span><span·class="ss">sha256</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ecdsa</span><span·class="p"·data-group-id="0887145746-6">}</span><span·class="p">,</span><span·class="w">2499 </span><span·class="p"·data-group-id="6314026873-6">{</span><span·class="ss">sha256</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ecdsa</span><span·class="p"·data-group-id="6314026873-6">}</span><span·class="p">,</span><span·class="w">
2500 </span><span·class="p"·data-group-id="0887145746-7">{</span><span·class="ss">sha256</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rsa</span><span·class="p"·data-group-id="0887145746-7">}</span><span·class="w">2500 </span><span·class="p"·data-group-id="6314026873-7">{</span><span·class="ss">sha256</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rsa</span><span·class="p"·data-group-id="6314026873-7">}</span><span·class="w">
2501 </span><span·class="p"·data-group-id="0887145746-1">]</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><ul><li>Support·for·<code·class="inline">{md5,·rsa}</code>·was·removed·from·the·TLS-1.2·default·in2501 </span><span·class="p"·data-group-id="6314026873-1">]</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Change</h4><ul><li>Support·for·<code·class="inline">{md5,·rsa}</code>·was·removed·from·the·TLS-1.2·default·in
2502 ssl-8.0·(Erlang/OTP·22).</li><li>Support·for·<code·class="inline">{sha,·_}</code>·(SHA1)·and·<code·class="inline">{sha224,·_}</code>·was·removed2502 ssl-8.0·(Erlang/OTP·22).</li><li>Support·for·<code·class="inline">{sha,·_}</code>·(SHA1)·and·<code·class="inline">{sha224,·_}</code>·was·removed
2503 from·the·TLS-1.2·default·in·ssl-11.0·(Erlang/OTP·26).</li></ul></section><p>The·list·for·<code·class="inline">rsa_pss_schemes</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1667410846-1">[</span><span·class="ss">rsa_pss_pss_sha512</span><span·class="p">,</span><span·class="w">2503 from·the·TLS-1.2·default·in·ssl-11.0·(Erlang/OTP·26).</li></ul></section><p>The·list·for·<code·class="inline">rsa_pss_schemes</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1559068898-1">[</span><span·class="ss">rsa_pss_pss_sha512</span><span·class="p">,</span><span·class="w">
2504 </span><span·class="ss">rsa_pss_pss_sha384</span><span·class="p">,</span><span·class="w">2504 </span><span·class="ss">rsa_pss_pss_sha384</span><span·class="p">,</span><span·class="w">
2505 </span><span·class="ss">rsa_pss_pss_sha256</span><span·class="p">,</span><span·class="w">2505 </span><span·class="ss">rsa_pss_pss_sha256</span><span·class="p">,</span><span·class="w">
2506 </span><span·class="ss">rsa_pss_rsae_sha512</span><span·class="p">,</span><span·class="w">2506 </span><span·class="ss">rsa_pss_rsae_sha512</span><span·class="p">,</span><span·class="w">
2507 </span><span·class="ss">rsa_pss_rsae_sha384</span><span·class="p">,</span><span·class="w">2507 </span><span·class="ss">rsa_pss_rsae_sha384</span><span·class="p">,</span><span·class="w">
2508 </span><span·class="ss">rsa_pss_rsae_sha256</span><span·class="p"·data-group-id="1667410846-1">]</span></code></pre><p>The·list·of·<code·class="inline">TLS_13_Legacy_Schemes</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6636912102-1">[</span><span·class="w">2508 </span><span·class="ss">rsa_pss_rsae_sha256</span><span·class="p"·data-group-id="1559068898-1">]</span></code></pre><p>The·list·of·<code·class="inline">TLS_13_Legacy_Schemes</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9878978560-1">[</span><span·class="w">
2509 </span><span·class="c1">%%·Legacy·algorithms·only·applicable·to·certificate·signatures</span><span·class="w">2509 </span><span·class="c1">%%·Legacy·algorithms·only·applicable·to·certificate·signatures</span><span·class="w">
2510 </span><span·class="ss">rsa_pkcs1_sha512</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·Corresponds·to·{sha512,·rsa}</span><span·class="w">2510 </span><span·class="ss">rsa_pkcs1_sha512</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·Corresponds·to·{sha512,·rsa}</span><span·class="w">
2511 </span><span·class="ss">rsa_pkcs1_sha384</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·Corresponds·to·{sha384,·rsa}</span><span·class="w">2511 </span><span·class="ss">rsa_pkcs1_sha384</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·Corresponds·to·{sha384,·rsa}</span><span·class="w">
2512 </span><span·class="ss">rsa_pkcs1_sha256</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·Corresponds·to·{sha256,·rsa}</span><span·class="w">2512 </span><span·class="ss">rsa_pkcs1_sha256</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%%·Corresponds·to·{sha256,·rsa}</span><span·class="w">
2513 </span><span·class="p"·data-group-id="6636912102-1">]</span></code></pre><p>The·list·of·<code·class="inline">Default_TLS_13_Schemes</code>·is·defined·as·follows:</p><pre><code·class="text">[2513 </span><span·class="p"·data-group-id="9878978560-1">]</span></code></pre><p>The·list·of·<code·class="inline">Default_TLS_13_Schemes</code>·is·defined·as·follows:</p><pre><code·class="text">[
2514 %%·EDDSA2514 %%·EDDSA
2515 eddsa_ed25519,2515 eddsa_ed25519,
2516 eddsa_ed4482516 eddsa_ed448
  
2517 %%·ECDSA2517 %%·ECDSA
2518 ecdsa_secp521r1_sha512,2518 ecdsa_secp521r1_sha512,
2519 ecdsa_secp384r1_sha384,2519 ecdsa_secp384r1_sha384,
Offset 2592, 16 lines modifiedOffset 2592, 16 lines modified
  
2592 ······<div·class="specs">2592 ······<div·class="specs">
  
2593 ··········<pre·translate="no"><span·class="attribute">-type</span>·anchor_fun()·::·fun().</pre>2593 ··········<pre·translate="no"><span·class="attribute">-type</span>·anchor_fun()·::·fun().</pre>
  
2594 ······</div>2594 ······</div>
  
2595 <p>Claim·an·intermediate·CA·in·the·chain·as·trusted.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="1403353851-1">(</span><span·class="n">Chain</span><span·class="p">:</span><span·class="p">:</span><span·class="p"·data-group-id="1403353851-2">[</span><span·class="nc">public_key</span><span·class="p">:</span><span·class="nf">der_encoded</span><span·class=[·...·truncated·by·diffoscope;·len:·188,·SHA:·c4282feb4a3cf7da6d30e1117b298e5b35a4ef8f0a9af2732b451d6696f41475·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">2595 <p>Claim·an·intermediate·CA·in·the·chain·as·trusted.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0668893192-1">(</span><span·class="n">Chain</span><span·class="p">:</span><span·class="p">:</span><span·class="p"·data-group-id="0668893192-2">[</span><span·class="nc">public_key</span><span·class="p">:</span><span·class="nf">der_encoded</span><span·class=[·...·truncated·by·diffoscope;·len:·188,·SHA:·184755a040b54eb5c66f0857706cd2e5f27ed93745b174eb232de91a2221001d·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
2596 ······</span><span·class="p"·data-group-id="1403353851-4">{</span><span·class="ss">trusted_ca</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DerCert</span><span·class="p">:</span><span·class="p">:</span><span·class="nc">public_key</span><span·class="p">:</span><span·class="nf"[·...·truncated·by·diffoscope;·len:·166,·SHA:·8b902df665351d9097329a36c580f404039465bc8be73380adc0de318cf59ca8·...·]-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">unknown_ca</span><span·class="p">.</span></code></pre><p>TLS·then·uses·<a·href="../../../../lib/public_key-1.17.1/doc/html/public_key.html#pkix_path_validation/3"><code·class="inline">public_key:pkix_path_validation/3</code></a>·with·the·selected·CA2596 ······</span><span·class="p"·data-group-id="0668893192-4">{</span><span·class="ss">trusted_ca</span><span·class="p">,</span><span·class="w">·</span><span·class="n">DerCert</span><span·class="p">:</span><span·class="p">:</span><span·class="nc">public_key</span><span·class="p">:</span><span·class="nf"[·...·truncated·by·diffoscope;·len:·166,·SHA:·c7ccf5f02d5b61188572580e665da582e732a9db518ceccb71752fb66faa7668·...·]-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">unknown_ca</span><span·class="p">.</span></code></pre><p>TLS·then·uses·<a·href="../../../../lib/public_key-1.17.1/doc/html/public_key.html#pkix_path_validation/3"><code·class="inline">public_key:pkix_path_validation/3</code></a>·with·the·selected·CA
2597 as·the·trusted·anchor·and·verifies·the·rest·of·the·chain.</p>2597 as·the·trusted·anchor·and·verifies·the·rest·of·the·chain.</p>
2598 ··</section>2598 ··</section>
2599 </section>2599 </section>
2600 <section·class="detail"·id="t:cert_key_conf/0">2600 <section·class="detail"·id="t:cert_key_conf/0">
  
2601 ··<div·class="detail-header">2601 ··<div·class="detail-header">
2602 ····<a·href="#t:cert_key_conf/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">2602 ····<a·href="#t:cert_key_conf/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">
Offset 3023, 15 lines modifiedOffset 3023, 15 lines modified
3023 <a·href="#connect/3">connect/3,4</a>·unless·it·is·of·type·<a·href="../../../../lib/kernel-10.2.6/doc/html/inet.html#t:ip_address/0"><code·class="inline">inet:ip_address()</code></a>.3023 <a·href="#connect/3">connect/3,4</a>·unless·it·is·of·type·<a·href="../../../../lib/kernel-10.2.6/doc/html/inet.html#t:ip_address/0"><code·class="inline">inet:ip_address()</code></a>.
3024 The·hostname·will·also·be·used·in·the·hostname·verification·of·the·peer3024 The·hostname·will·also·be·used·in·the·hostname·verification·of·the·peer
3025 certificate·using·<a·href="../../../../lib/public_key-1.17.1/doc/html/public_key.html#pkix_verify_hostname/2"><code·class="inline">public_key:pkix_verify_hostname/2</code></a>.3025 certificate·using·<a·href="../../../../lib/public_key-1.17.1/doc/html/public_key.html#pkix_verify_hostname/2"><code·class="inline">public_key:pkix_verify_hostname/2</code></a>.
3026 The·special·value·<code·class="inline">disable</code>·prevents·the·Server·Name·Indication·extension·from3026 The·special·value·<code·class="inline">disable</code>·prevents·the·Server·Name·Indication·extension·from
3027 being·sent·and·disables·the·hostname·verification·check.</p></li><li><p><strong><code·class="inline">{customize_hostname_check,·HostNameCheckOpts}</code></strong>·-·Customization·option</p><p>Customizes·the·hostname·verification·of·the·peer·certificate,·as·various3027 being·sent·and·disables·the·hostname·verification·check.</p></li><li><p><strong><code·class="inline">{customize_hostname_check,·HostNameCheckOpts}</code></strong>·-·Customization·option</p><p>Customizes·the·hostname·verification·of·the·peer·certificate,·as·various
3028 protocols·that·use·TLS,·such·as·HTTP·or·LDAP,·may·require·different·approaches.·For3028 protocols·that·use·TLS,·such·as·HTTP·or·LDAP,·may·require·different·approaches.·For
3029 example,·here·is·how·to·use·standard·hostname·checking·for·HTTPS·implemented·in3029 example,·here·is·how·to·use·standard·hostname·checking·for·HTTPS·implemented·in
3030 <a·href="../../../../lib/public_key-1.17.1/doc/html/public_key_app.html">Public_Key</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5342162281-1">{</span><span·class="ss">customize_hostname_check</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5342162281-2">[</span><span·class="p"·data-group-id="5342162281-3">{</span><span·class="ss">match_fun</span[·...·truncated·by·diffoscope;·len:·443,·SHA:·6c93b5fe285e7feb780a0296805db9d4473234d38df63b3bf551c7eaabdefde8·...·]-1">}</span></code></pre><p>For·futher·description·of·the·customize·options,·see3030 <a·href="../../../../lib/public_key-1.17.1/doc/html/public_key_app.html">Public_Key</a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4034646354-1">{</span><span·class="ss">customize_hostname_check</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4034646354-2">[</span><span·class="p"·data-group-id="4034646354-3">{</span><span·class="ss">match_fun</span[·...·truncated·by·diffoscope;·len:·443,·SHA:·ad01d7d0f0b2757ff4fd25c76f6bad285d4c4bc6526176b2d42a0666c62be158·...·]-1">}</span></code></pre><p>For·futher·description·of·the·customize·options,·see
3031 <a·href="../../../../lib/public_key-1.17.1/doc/html/public_key.html#pkix_verify_hostname/3"><code·class="inline">public_key:pkix_verify_hostname/3</code></a>.</p></li><li><p><strong><code·class="inline">{client_certificate_authorities,·UseCertAuth}</code></strong>·-·Inter-op·hint·option</p><p>If·<code·class="inline">UseCertAuth</code>·is·set·to·<code·class="inline">true</code>,·sends·the·certificate·authorities3031 <a·href="../../../../lib/public_key-1.17.1/doc/html/public_key.html#pkix_verify_hostname/3"><code·class="inline">public_key:pkix_verify_hostname/3</code></a>.</p></li><li><p><strong><code·class="inline">{client_certificate_authorities,·UseCertAuth}</code></strong>·-·Inter-op·hint·option</p><p>If·<code·class="inline">UseCertAuth</code>·is·set·to·<code·class="inline">true</code>,·sends·the·certificate·authorities
3032 extension·in·the·TLS-1.3·client·hello.·The·default·is·<code·class="inline">false</code>.·Note3032 extension·in·the·TLS-1.3·client·hello.·The·default·is·<code·class="inline">false</code>.·Note
3033 that·setting·<code·class="inline">UseCertAuth</code>·to·<code·class="inline">true</code>·can·result·in·a·significant3033 that·setting·<code·class="inline">UseCertAuth</code>·to·<code·class="inline">true</code>·can·result·in·a·significant
3034 overhead·if·there·exists·many·trusted·CA·certificates.·(Since3034 overhead·if·there·exists·many·trusted·CA·certificates.·(Since
3035 Erlang/OTP·24.3.)</p></li><li><p><strong><code·class="inline">{stapling,·Stapling}</code></strong>·-·Certificate·revocation·check·option</p><p>If·<code·class="inline">Stapling</code>·is·atom·<code·class="inline">staple</code>·or·a·map,·OCSP·stapling·will·be3035 Erlang/OTP·24.3.)</p></li><li><p><strong><code·class="inline">{stapling,·Stapling}</code></strong>·-·Certificate·revocation·check·option</p><p>If·<code·class="inline">Stapling</code>·is·atom·<code·class="inline">staple</code>·or·a·map,·OCSP·stapling·will·be
3036 enabled,·meaning·that·an·extension·of·type·&quot;status_request&quot;·will·be3036 enabled,·meaning·that·an·extension·of·type·&quot;status_request&quot;·will·be
3037 included·in·the·client·hello·to·indicate·the·desire·to·receive3037 included·in·the·client·hello·to·indicate·the·desire·to·receive
Offset 3161, 25 lines modifiedOffset 3161, 25 lines modified
3161 ··········{early_data,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}·|3161 ··········{early_data,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}·|
3162 ··········{middlebox_comp_mode,·MiddleBoxMode·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()}.</pre>3162 ··········{middlebox_comp_mode,·MiddleBoxMode·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()}.</pre>
  
3163 ······</div>3163 ······</div>
  
3164 <p>Options·only·relevant·for·TLS-1.3.</p><ul><li><p><strong><code·class="inline">{session_tickets,·SessionTickets}</code></strong>·-·Use·of·session·tickets</p><p>Configures·the·session·ticket·functionality.·Allowed·values·are·<code·class="inline">disabled</code>,3164 <p>Options·only·relevant·for·TLS-1.3.</p><ul><li><p><strong><code·class="inline">{session_tickets,·SessionTickets}</code></strong>·-·Use·of·session·tickets</p><p>Configures·the·session·ticket·functionality.·Allowed·values·are·<code·class="inline">disabled</code>,
3165 <code·class="inline">manual</code>,·and·<code·class="inline">auto</code>.·If·it·is·set·to·<code·class="inline">manual</code>·the·client·will·send·the·ticket3165 <code·class="inline">manual</code>,·and·<code·class="inline">auto</code>.·If·it·is·set·to·<code·class="inline">manual</code>·the·client·will·send·the·ticket
3166 information·to·user·process·in·a·3-tuple:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3152559394-1">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">session_ticket</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3152559394-2">{</span><span·class="n">SNI<[·...·truncated·by·diffoscope;·len:·181,·SHA:·523911899f5a7a0d10a540af01920bb86ebc42dd2382b396d80e25310317a7d2·...·]-1">}</span></code></pre><p>where·<code·class="inline">SNI</code>·is·the·ServerNameIndication·and·<code·class="inline">TicketData</code>·is·the·extended·ticket3166 information·to·user·process·in·a·3-tuple:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7192371821-1">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">session_ticket</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7192371821-2">{</span><span·class="n">SNI<[·...·truncated·by·diffoscope;·len:·181,·SHA:·1b8814e6106535d8751d75fea0dc7d22f5b2b5db81aa27ce85290058c835ff29·...·]-1">}</span></code></pre><p>where·<code·class="inline">SNI</code>·is·the·ServerNameIndication·and·<code·class="inline">TicketData</code>·is·the·extended·ticket
3167 data·that·can·be·used·in·subsequent·session·resumptions.</p><p>If·it·is·set·to·<code·class="inline">auto</code>,·the·client·automatically·handles·received·tickets·and3167 data·that·can·be·used·in·subsequent·session·resumptions.</p><p>If·it·is·set·to·<code·class="inline">auto</code>,·the·client·automatically·handles·received·tickets·and
3168 tries·to·use·them·when·making·new·TLS·connections·(session·resumption·with3168 tries·to·use·them·when·making·new·TLS·connections·(session·resumption·with
3169 pre-shared·keys).</p><p>Ticket·lifetime,·the·number·of·tickets·sent·by·the·server,·and·the3169 pre-shared·keys).</p><p>Ticket·lifetime,·the·number·of·tickets·sent·by·the·server,·and·the
3170 maximum·number·of·tickets·stored·by·the·server·in·stateful·mode·are·configured3170 maximum·number·of·tickets·stored·by·the·server·in·stateful·mode·are·configured
3171 by·<a·href="ssl_app.html#configuration">application·variables</a>.</p><p>See·also3171 by·<a·href="ssl_app.html#configuration">application·variables</a>.</p><p>See·also
3172 <a·href="using_ssl.html#session-tickets-and-session-resumption-in-tls-1-3">SSL·User's·Guide,·Session·Tickets·and·Session·Resumption·in·TLS·1.3</a>.</p></li><li><p><strong><code·class="inline">{use_ticket,·Tickets}</code></strong></p><p>Configures·the·session·tickets·to·be·used·for·session·resumption.·It·is·a3172 <a·href="using_ssl.html#session-tickets-and-session-resumption-in-tls-1-3">SSL·User's·Guide,·Session·Tickets·and·Session·Resumption·in·TLS·1.3</a>.</p></li><li><p><strong><code·class="inline">{use_ticket,·Tickets}</code></strong></p><p>Configures·the·session·tickets·to·be·used·for·session·resumption.·It·is·a
3173 mandatory·option·in·<code·class="inline">manual</code>·mode·(<code·class="inline">{session_tickets,·manual}</code>).</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Session·tickets·are·only·sent·to·the·user·if·option·<code·class="inline">session_tickets</code>·is·set·to3173 mandatory·option·in·<code·class="inline">manual</code>·mode·(<code·class="inline">{session_tickets,·manual}</code>).</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Session·tickets·are·only·sent·to·the·user·if·option·<code·class="inline">session_tickets</code>·is·set·to
3174 <code·class="inline">manual</code></p><p>This·option·is·supported·by·TLS-1.3.·See·also3174 <code·class="inline">manual</code></p><p>This·option·is·supported·by·TLS-1.3.·See·also
3175 <a·href="using_ssl.html#session-tickets-and-session-resumption-in-tls-1-3">SSL·User's·Guide,·Session·Tickets·and·Session·Resumption·in·TLS·1.3</a>.</p></section></li><li><p><strong><code·class="inline">{early_data,·EarlyData}</code></strong></p><p>Configures·the·early·data·to·be·sent·by·the·client.</p><p>To·verify·that·the·server·has·the·intention·to·process·the·early3175 <a·href="using_ssl.html#session-tickets-and-session-resumption-in-tls-1-3">SSL·User's·Guide,·Session·Tickets·and·Session·Resumption·in·TLS·1.3</a>.</p></section></li><li><p><strong><code·class="inline">{early_data,·EarlyData}</code></strong></p><p>Configures·the·early·data·to·be·sent·by·the·client.</p><p>To·verify·that·the·server·has·the·intention·to·process·the·early
3176 data,·the·following·tuple·is·sent·to·the·user·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1253839980-1">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SslSocket</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1253839980-2">{</span><span·class="ss">early_dat[·...·truncated·by·diffoscope;·len:·178,·SHA:·ca2ab0c13e101de698693c3110ae2bcfa958072057d99c791952a4202380b630·...·]0-1">}</span></code></pre><p>where·<code·class="inline">Result</code>·is·either·<code·class="inline">accepted</code>·or·<code·class="inline">rejected</code>.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>It·is·the·responsibility·of·the·user·to·handle·rejected·<code·class="inline">EarlyData</code>·and·to3176 data,·the·following·tuple·is·sent·to·the·user·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6206399930-1">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SslSocket</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6206399930-2">{</span><span·class="ss">early_dat[·...·truncated·by·diffoscope;·len:·178,·SHA:·ae48f40cfcdfadb81859095a6c9973d2093d5f9a3c13010beb31b006d20871bc·...·]0-1">}</span></code></pre><p>where·<code·class="inline">Result</code>·is·either·<code·class="inline">accepted</code>·or·<code·class="inline">rejected</code>.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>It·is·the·responsibility·of·the·user·to·handle·rejected·<code·class="inline">EarlyData</code>·and·to
3177 resend·when·appropriate.</p></section></li><li><p><strong><code·class="inline">{middlebox_comp_mode,·MiddleBoxMode}</code></strong></p><p>Configures·the·middlebox·compatibility·mode·for·a·TLS-1.3·connection.</p><p>A·significant·number·of·middleboxes·misbehave·when·a·TLS-1.33177 resend·when·appropriate.</p></section></li><li><p><strong><code·class="inline">{middlebox_comp_mode,·MiddleBoxMode}</code></strong></p><p>Configures·the·middlebox·compatibility·mode·for·a·TLS-1.3·connection.</p><p>A·significant·number·of·middleboxes·misbehave·when·a·TLS-1.3
3178 connection·is·negotiated.·Implementations·can·increase·the·chance·of3178 connection·is·negotiated.·Implementations·can·increase·the·chance·of
3179 making·connections·through·those·middleboxes·by·adapting·the·TLS-1.33179 making·connections·through·those·middleboxes·by·adapting·the·TLS-1.3
3180 handshake·to·resemble·that·of·a·TLS-1.2·handshake.</p><p>The·middlebox·compatibility·mode·is·enabled·(<code·class="inline">true</code>)·by·default.</p></li></ul>3180 handshake·to·resemble·that·of·a·TLS-1.2·handshake.</p><p>The·middlebox·compatibility·mode·is·enabled·(<code·class="inline">true</code>)·by·default.</p></li></ul>
3181 ··</section>3181 ··</section>
3182 </section>3182 </section>
  
Offset 3606, 28 lines modifiedOffset 3606, 28 lines modified
3606 and·key·options.·For·examples,·see·the·<a·href="using_ssl.html">User's·Guide</a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p><code·class="inline">eddsa</code>·certificates·are·only·supported·by·TLS-1.3·implementations·that·do·not·support·<code·class="inline">dsa</code>3606 and·key·options.·For·examples,·see·the·<a·href="using_ssl.html">User's·Guide</a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p><code·class="inline">eddsa</code>·certificates·are·only·supported·by·TLS-1.3·implementations·that·do·not·support·<code·class="inline">dsa</code>
3607 certificates.·<code·class="inline">rsa_pss_pss</code>·(RSA·certificates·using·Probabilistic·Signature3607 certificates.·<code·class="inline">rsa_pss_pss</code>·(RSA·certificates·using·Probabilistic·Signature
3608 Scheme)·are·supported·in·TLS-1.2·and·TLS-1.3,·but·some·TLS-1.2·implementations3608 Scheme)·are·supported·in·TLS-1.2·and·TLS-1.3,·but·some·TLS-1.2·implementations
3609 do·not·support·<code·class="inline">rsa_pss_pss</code>.</p></section></li><li><p><strong><code·class="inline">{depth,·AllowedCertChainLen}</code></strong>·-·Limits·the·accepted·number·of·certificates·in·the·certificate·chain.</p><p>Maximum·number·of·non-self-issued·intermediate·certificates·that·can·follow·the3609 do·not·support·<code·class="inline">rsa_pss_pss</code>.</p></section></li><li><p><strong><code·class="inline">{depth,·AllowedCertChainLen}</code></strong>·-·Limits·the·accepted·number·of·certificates·in·the·certificate·chain.</p><p>Maximum·number·of·non-self-issued·intermediate·certificates·that·can·follow·the
3610 peer·certificate·in·a·valid·certification·path.·So,·if·depth·is·0·the·PEER·must3610 peer·certificate·in·a·valid·certification·path.·So,·if·depth·is·0·the·PEER·must
3611 be·signed·by·the·trusted·ROOT-CA·directly;·if·1·the·path·can·be·PEER,·CA,3611 be·signed·by·the·trusted·ROOT-CA·directly;·if·1·the·path·can·be·PEER,·CA,
3612 ROOT-CA;·if·2·the·path·can·be·PEER,·CA,·CA,·ROOT-CA,·and·so·on.·The·default3612 ROOT-CA;·if·2·the·path·can·be·PEER,·CA,·CA,·ROOT-CA,·and·so·on.·The·default
3613 value·is·10.·Used·to·mitigate·DoS·attack·possibilities.</p></li><li><p><strong><code·class="inline">{verify_fun,·Verify}</code></strong>·-·Customize·certificate·path·validation</p><p>The·verification·fun·is·to·be·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="5293629589-1">(</span><span·class="n">OtpCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="52936[·...·truncated·by·diffoscope;·len:·58,·SHA:·1c43ef57b2228a6b8890e45f64bd453c933956ef80deba66563493150d99d59b·...·]-2">}</span><span·class="p">,</span><span·class="w">3613 value·is·10.·Used·to·mitigate·DoS·attack·possibilities.</p></li><li><p><strong><code·class="inline">{verify_fun,·Verify}</code></strong>·-·Customize·certificate·path·validation</p><p>The·verification·fun·is·to·be·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="8005944947-1">(</span><span·class="n">OtpCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="80059[·...·truncated·by·diffoscope;·len:·58,·SHA:·9d0966d42bfd917d11ec5bd39c147897533226b99624109354de3e0b7610ccf3·...·]-2">}</span><span·class="p">,</span><span·class="w">
3614 ····</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">InitialUserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="5293629589-3">(</span><span·class="p"·data-group-id="5293629589-3">)</span><span·class="p"·data-group-id="5293629589-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">3614 ····</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">InitialUserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="8005944947-3">(</span><span·class="p"·data-group-id="8005944947-3">)</span><span·class="p"·data-group-id="8005944947-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
3615 ··</span><span·class="p"·data-group-id="5293629589-4">{</span><span·class="ss">valid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><[·...·truncated·by·diffoscope;·len:·146,·SHA:·8b14ab094585732a82273554707c94c7d0b75d8112c2b1f45d1a1c7a2b374573·...·]-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">3615 ··</span><span·class="p"·data-group-id="8005944947-4">{</span><span·class="ss">valid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">UserState</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><[·...·truncated·by·diffoscope;·len:·146,·SHA:·51e9a44660cbe3792c7adf410cce8dff7de50ef87f381e39dac8afa1e4790103·...·]-4">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
3616 ··</span><span·class="p"·data-group-id="5293629589-6">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span[·...·truncated·by·diffoscope;·len:·661,·SHA:·c8e16d5c3166030e537ebc625f889522db4ca10b3c514afa6c8372a03b3ed02a·...·]-8">}</span><span·class="p">.</span><span·class="w">3616 ··</span><span·class="p"·data-group-id="8005944947-6">{</span><span·class="ss">fail</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span[·...·truncated·by·diffoscope;·len:·661,·SHA:·d06a016010a787971a6ba0783b49ac26517a973e8e9067f6108c9fdcadb26c6f·...·]-8">}</span><span·class="p">.</span><span·class="w">
  
3617 </span><span·class="nf">fun</span><span·class="p"·data-group-id="5293629589-10">(</span><span·class="n">OtpCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="5293[·...·truncated·by·diffoscope;·len:·435,·SHA:·125ea0626c4ea1f9e6d23186858baa0e0f8e6530de912b885c199442495016c8·...·]-12">)</span><span·class="p">,</span><span·class="w">3617 </span><span·class="nf">fun</span><span·class="p"·data-group-id="8005944947-10">(</span><span·class="n">OtpCert</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">&#39;OTPCertificate&#39;</span><span·class="p"·data-group-id="8005[·...·truncated·by·diffoscope;·len:·435,·SHA:·7b0ebec748941c635cb9081322801ad1c473a540ee3ccd2145598ccf354e8b88·...·]-12">)</span><span·class="p">,</span><span·class="w">
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274 ········Built·using274 ········Built·using
275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the275 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>276 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
277 ······</p>277 ······</p>
278 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>278 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
279 ····</footer>279 ····</footer>
280 ··</div>280 ··</div>
281 </main>281 </main>
282 </div>282 </div>
283 <script>283 <script>
284 ··function·mermaidLoaded()·{284 ··function·mermaidLoaded()·{
285 ····mermaid.initialize({285 ····mermaid.initialize({
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358 ········Built·using358 ········Built·using
359 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the359 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
360 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>360 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
361 ······</p>361 ······</p>
362 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>362 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
363 ····</footer>363 ····</footer>
364 ··</div>364 ··</div>
365 </main>365 </main>
366 </div>366 </div>
367 <script>367 <script>
368 ··function·mermaidLoaded()·{368 ··function·mermaidLoaded()·{
369 ····mermaid.initialize({369 ····mermaid.initialize({
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515 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>515 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
516 ······</p>516 ······</p>
517 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>517 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
518 ····</footer>518 ····</footer>
519 ··</div>519 ··</div>
520 </main>520 </main>
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143 </h2>143 </h2>
144 <p>Boot·scripts·are·built·using·the·<code·class="inline">systools</code>·utility·in·the·SASL·application.·For144 <p>Boot·scripts·are·built·using·the·<code·class="inline">systools</code>·utility·in·the·SASL·application.·For
145 more·information·on·<code·class="inline">systools</code>,·see·the·SASL·documentation.·This·is·only·an145 more·information·on·<code·class="inline">systools</code>,·see·the·SASL·documentation.·This·is·only·an
146 example·of·what·can·be·done.</p><p>The·simplest·boot·script·possible·includes·only·the·Kernel·and·STDLIB146 example·of·what·can·be·done.</p><p>The·simplest·boot·script·possible·includes·only·the·Kernel·and·STDLIB
147 applications.·Such·a·script·is·located·in·the·<code·class="inline">bin</code>·directory·of·the·Erlang147 applications.·Such·a·script·is·located·in·the·<code·class="inline">bin</code>·directory·of·the·Erlang
148 distribution.·The·source·for·the·script·is·found·under·the·Erlang·installation148 distribution.·The·source·for·the·script·is·found·under·the·Erlang·installation
149 top·directory·under·<code·class="inline">releases/&lt;OTP·version&gt;/start_clean.rel</code>.</p><p>Do·the·following:</p><ul><li>Copy·that·script·to·another·location·(and·preferably·another·name).</li><li>Add·the·applications·Crypto,·Public·Key,·and·SSL·with·their·current·version149 top·directory·under·<code·class="inline">releases/&lt;OTP·version&gt;/start_clean.rel</code>.</p><p>Do·the·following:</p><ul><li>Copy·that·script·to·another·location·(and·preferably·another·name).</li><li>Add·the·applications·Crypto,·Public·Key,·and·SSL·with·their·current·version
150 numbers·after·the·STDLIB·application.</li></ul><p>The·following·shows·an·example·<code·class="inline">.rel</code>·file·with·TLS·added:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="5737272976-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5737272976-2">{</span><span·class="s">&quot;OTP··APN·181·01&quot;</span><span·class="p">,</span><span·class="s">&quot;R15A&q[·...·truncated·by·diffoscope;·len:·320,·SHA:·46b587249ca6a374eea64959b315928e9f5c042d98324e4cd8a11cefad679344·...·]-3">}</span><span·class="p">,</span><span·class="w">150 numbers·after·the·STDLIB·application.</li></ul><p>The·following·shows·an·example·<code·class="inline">.rel</code>·file·with·TLS·added:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="p"·data-group-id="1268179089-1">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1268179089-2">{</span><span·class="s">&quot;OTP··APN·181·01&quot;</span><span·class="p">,</span><span·class="s">&quot;R15A&q[·...·truncated·by·diffoscope;·len:·320,·SHA:·bcf51b3fa0e303afa356435012da39d72f074dc0d0c8e4b54388c60d66493b9e·...·]-3">}</span><span·class="p">,</span><span·class="w">
151 ······</span><span·class="p"·data-group-id="5737272976-4">[</span><span·class="p"·data-group-id="5737272976-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;2.15&quot;</span><span·class="p"·data-group-id="5737272976-5">}</span><span·class="p">,</span><span·class="w">151 ······</span><span·class="p"·data-group-id="1268179089-4">[</span><span·class="p"·data-group-id="1268179089-5">{</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="s">&quot;2.15&quot;</span><span·class="p"·data-group-id="1268179089-5">}</span><span·class="p">,</span><span·class="w">
152 ······</span><span·class="p"·data-group-id="5737272976-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;1.18&quot;</span><span·class="p"·data-group-id="5737272976-6">}</span><span·class="p">,</span><span·class="w">152 ······</span><span·class="p"·data-group-id="1268179089-6">{</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="s">&quot;1.18&quot;</span><span·class="p"·data-group-id="1268179089-6">}</span><span·class="p">,</span><span·class="w">
153 ······</span><span·class="p"·data-group-id="5737272976-7">{</span><span·class="ss">crypto</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.0.3&quot;</span><span·class="p"·data-group-id="5737272976-7">}</span><span·class="p">,</span><span·class="w">153 ······</span><span·class="p"·data-group-id="1268179089-7">{</span><span·class="ss">crypto</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2.0.3&quot;</span><span·class="p"·data-group-id="1268179089-7">}</span><span·class="p">,</span><span·class="w">
154 ······</span><span·class="p"·data-group-id="5737272976-8">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;0.12&quot;</span><span·class="p"·data-group-id="5737272976-8">}</span><span·class="p">,</span><span·class="w">154 ······</span><span·class="p"·data-group-id="1268179089-8">{</span><span·class="ss">public_key</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;0.12&quot;</span><span·class="p"·data-group-id="1268179089-8">}</span><span·class="p">,</span><span·class="w">
155 ······</span><span·class="p"·data-group-id="5737272976-9">{</span><span·class="ss">asn1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.0&quot;</span><span·class="p"·data-group-id="5737272976-9">}</span><span·class="p">,</span><span·class="w">155 ······</span><span·class="p"·data-group-id="1268179089-9">{</span><span·class="ss">asn1</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;4.0&quot;</span><span·class="p"·data-group-id="1268179089-9">}</span><span·class="p">,</span><span·class="w">
156 ······</span><span·class="p"·data-group-id="5737272976-10">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.0&quot;</span><span·class="p"·data-group-id="5737272976-10">}</span><span·class="w">156 ······</span><span·class="p"·data-group-id="1268179089-10">{</span><span·class="ss">ssl</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;5.0&quot;</span><span·class="p"·data-group-id="1268179089-10">}</span><span·class="w">
157 ······</span><span·class="p"·data-group-id="5737272976-4">]</span><span·class="p"·data-group-id="5737272976-1">}</span><span·class="p">.</span></code></pre><p>The·version·numbers·differ·in·your·system.·Whenever·one·of·the·applications157 ······</span><span·class="p"·data-group-id="1268179089-4">]</span><span·class="p"·data-group-id="1268179089-1">}</span><span·class="p">.</span></code></pre><p>The·version·numbers·differ·in·your·system.·Whenever·one·of·the·applications
158 included·in·the·script·is·upgraded,·change·the·script.</p><p>Do·the·following:</p><ul><li><p>Build·the·boot·script.</p><p>Assuming·the·<code·class="inline">.rel·file</code>·is·stored·in·a·file·<code·class="inline">start_ssl.rel</code>·in·the·current158 included·in·the·script·is·upgraded,·change·the·script.</p><p>Do·the·following:</p><ul><li><p>Build·the·boot·script.</p><p>Assuming·the·<code·class="inline">.rel·file</code>·is·stored·in·a·file·<code·class="inline">start_ssl.rel</code>·in·the·current
159 directory,·a·boot·script·can·be·built·as·follows:</p></li></ul><pre><code·class="text">···1&gt;·systools:make_script(&quot;start_ssl&quot;,[]).</code></pre><p>There·is·now·a·<code·class="inline">start_ssl.boot</code>·file·in·the·current·directory.</p><p>Do·the·following:</p><ul><li>Test·the·boot·script.·To·do·this,·start·Erlang·with·the·<code·class="inline">-boot</code>·command-line159 directory,·a·boot·script·can·be·built·as·follows:</p></li></ul><pre><code·class="text">···1&gt;·systools:make_script(&quot;start_ssl&quot;,[]).</code></pre><p>There·is·now·a·<code·class="inline">start_ssl.boot</code>·file·in·the·current·directory.</p><p>Do·the·following:</p><ul><li>Test·the·boot·script.·To·do·this,·start·Erlang·with·the·<code·class="inline">-boot</code>·command-line
160 parameter·specifying·this·boot·script·(with·its·full·path,·but·without·the160 parameter·specifying·this·boot·script·(with·its·full·path,·but·without·the
161 <code·class="inline">.boot</code>·suffix).·In·UNIX·it·can·look·as·follows:</li></ul><pre><code·class="text">$·erl·-boot·/home/me/ssl/start_ssl161 <code·class="inline">.boot</code>·suffix).·In·UNIX·it·can·look·as·follows:</li></ul><pre><code·class="text">$·erl·-boot·/home/me/ssl/start_ssl
162 Erlang·(BEAM)·emulator·version·5.0162 Erlang·(BEAM)·emulator·version·5.0
  
163 Eshell·V5.0··(abort·with·^G)163 Eshell·V5.0··(abort·with·^G)
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197 function·body·cannot·be·compiled·when·consulting·a·file.·Also·the·encoding197 function·body·cannot·be·compiled·when·consulting·a·file.·Also·the·encoding
198 of·the·file·can·be·specified·as·defined·by·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/epp.html"><code·class="inline">epp</code></a>.</p></section><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Do·not·tamper·with·the·socket·options·<code·class="inline">list</code>,·<code·class="inline">binary</code>,·<code·class="inline">active</code>,·<code·class="inline">packet</code>,198 of·the·file·can·be·specified·as·defined·by·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/epp.html"><code·class="inline">epp</code></a>.</p></section><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Do·not·tamper·with·the·socket·options·<code·class="inline">list</code>,·<code·class="inline">binary</code>,·<code·class="inline">active</code>,·<code·class="inline">packet</code>,
199 <code·class="inline">nodelay</code>·and·<code·class="inline">deliver</code>·since·they·are·used·by·the·distribution·protocol·handler199 <code·class="inline">nodelay</code>·and·<code·class="inline">deliver</code>·since·they·are·used·by·the·distribution·protocol·handler
200 itself.·Other·raw·socket·options·such·as·<code·class="inline">packet_size</code>·may·interfere·severely,200 itself.·Other·raw·socket·options·such·as·<code·class="inline">packet_size</code>·may·interfere·severely,
201 so·beware!</p></section><p>For·TLS·to·work,·at·least·a·public·key·and·a·certificate·must·be·specified·for201 so·beware!</p></section><p>For·TLS·to·work,·at·least·a·public·key·and·a·certificate·must·be·specified·for
202 the·server·side·and·the·client·needs·to·specify·CAs·that·it·trusts·(client·certification202 the·server·side·and·the·client·needs·to·specify·CAs·that·it·trusts·(client·certification
203 is·optional·and·requires·more·configuration).</p><p>In·the·following·example·(to·keep·it·simple),·the·PEM·file·<code·class="inline">&quot;/home/me/ssl/erlserver.pem&quot;</code>203 is·optional·and·requires·more·configuration).</p><p>In·the·following·example·(to·keep·it·simple),·the·PEM·file·<code·class="inline">&quot;/home/me/ssl/erlserver.pem&quot;</code>
204 contains·both·the·server·certificate·and·its·private·key·.</p><p>Create·a·file·named·for·example·<code·class="inline">&quot;/home/me/ssl/ssl_test@myhost.conf&quot;</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0652459878-1">[</span><span·class="p"·data-group-id="0652459878-2">{</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">204 contains·both·the·server·certificate·and·its·private·key·.</p><p>Create·a·file·named·for·example·<code·class="inline">&quot;/home/me/ssl/ssl_test@myhost.conf&quot;</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5024978802-1">[</span><span·class="p"·data-group-id="5024978802-2">{</span><span·class="ss">server</span><span·class="p">,</span><span·class="w">
205 ··</span><span·class="p"·data-group-id="0652459878-3">[</span><span·class="p"·data-group-id="0652459878-4">{</span><span·class="ss">certfile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/me/ssl/erlserver.pem&quot;</span><span·class="p"·data-group-id="065245987[·...·truncated·by·diffoscope;·len:·107,·SHA:·c1f5ef1f7594b41ee2c6c867fe2d8bbaa84bac20c630a5c82ce489cddf021526·...·]-2">}</span><span·class="p">,</span><span·class="w">205 ··</span><span·class="p"·data-group-id="5024978802-3">[</span><span·class="p"·data-group-id="5024978802-4">{</span><span·class="ss">certfile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/me/ssl/erlserver.pem&quot;</span><span·class="p"·data-group-id="502497880[·...·truncated·by·diffoscope;·len:·107,·SHA:·a24b5b34f5db1983dd55654759ab58969634cac59feb317098b6d5f9d64c77f6·...·]-2">}</span><span·class="p">,</span><span·class="w">
206 ·</span><span·class="p"·data-group-id="0652459878-5">{</span><span·class="ss">client</span><span·class="p">,</span><span·class="w">206 ·</span><span·class="p"·data-group-id="5024978802-5">{</span><span·class="ss">client</span><span·class="p">,</span><span·class="w">
207 ··</span><span·class="p"·data-group-id="0652459878-6">[</span><span·class="p"·data-group-id="0652459878-7">{</span><span·class="ss">cacertfile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/me/ssl/client_trusted.pem&quot;</span><span·class="p"·data-group-id="06[·...·truncated·by·diffoscope;·len:·167,·SHA:·35561bfdb84358e3ec648ebb351d5225552c905cd084bbaf0112057cb3085108·...·]-1">]</span><span·class="p">.</span></code></pre><p>And·then·start·the·node·like·this·(line·breaks·in·the·command·are·for207 ··</span><span·class="p"·data-group-id="5024978802-6">[</span><span·class="p"·data-group-id="5024978802-7">{</span><span·class="ss">cacertfile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;/home/me/ssl/client_trusted.pem&quot;</span><span·class="p"·data-group-id="50[·...·truncated·by·diffoscope;·len:·167,·SHA:·5aaf109700c2ba11912d8f7c534aab242e988c9e7378a2bb7b068258503ee992·...·]-1">]</span><span·class="p">.</span></code></pre><p>And·then·start·the·node·like·this·(line·breaks·in·the·command·are·for
208 readability,·and·shall·not·be·there·when·typed):</p><pre><code·class="text">$·erl·-boot·/home/me/ssl/start_ssl·-proto_dist·inet_tls208 readability,·and·shall·not·be·there·when·typed):</p><pre><code·class="text">$·erl·-boot·/home/me/ssl/start_ssl·-proto_dist·inet_tls
209 ··-ssl_dist_optfile·&quot;/home/me/ssl/ssl_test@myhost.conf&quot;209 ··-ssl_dist_optfile·&quot;/home/me/ssl/ssl_test@myhost.conf&quot;
210 ··-sname·ssl_test</code></pre><p>The·options·in·the·<code·class="inline">{server,·Opts}</code>·tuple·are·used·when·calling210 ··-sname·ssl_test</code></pre><p>The·options·in·the·<code·class="inline">{server,·Opts}</code>·tuple·are·used·when·calling
211 <a·href="ssl.html#handshake/3"><code·class="inline">ssl:handshake/3</code></a>,·and·the·options·in·the·<code·class="inline">{client,·Opts}</code>·tuple·are·used·when211 <a·href="ssl.html#handshake/3"><code·class="inline">ssl:handshake/3</code></a>,·and·the·options·in·the·<code·class="inline">{client,·Opts}</code>·tuple·are·used·when
212 calling·<a·href="ssl.html#connect/4"><code·class="inline">ssl:connect/4</code></a>.</p><p>For·the·client,·the·option·<code·class="inline">{server_name_indication,·atom_to_list(TargetNode)}</code>212 calling·<a·href="ssl.html#connect/4"><code·class="inline">ssl:connect/4</code></a>.</p><p>For·the·client,·the·option·<code·class="inline">{server_name_indication,·atom_to_list(TargetNode)}</code>
213 is·added·when·connecting.·This·makes·it·possible·to·use·the·client·option213 is·added·when·connecting.·This·makes·it·possible·to·use·the·client·option
214 <code·class="inline">{verify,·verify_peer}</code>,·and·the·client·will·verify·that·the·certificate·matches214 <code·class="inline">{verify,·verify_peer}</code>,·and·the·client·will·verify·that·the·certificate·matches
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270 in·that·variable·and·are·then·interpreted·as·command-line·arguments·for·all270 in·that·variable·and·are·then·interpreted·as·command-line·arguments·for·all
271 subsequent·invocations·of·Erlang.</p><p>In·a·Unix·(Bourne)·shell,·it·can·look·as·follows·(line·breaks·are·for271 subsequent·invocations·of·Erlang.</p><p>In·a·Unix·(Bourne)·shell,·it·can·look·as·follows·(line·breaks·are·for
272 readability,·they·are·not·to·be·there·when·typed):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="n">ERL_FLAGS</span><span·class="o">=</span><span·class="s">&quot;-boot·/home/me/ssl/start_ssl·-proto_dist·inet_tls272 readability,·they·are·not·to·be·there·when·typed):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="n">ERL_FLAGS</span><span·class="o">=</span><span·class="s">&quot;-boot·/home/me/ssl/start_ssl·-proto_dist·inet_tls
273 ··-ssl_dist_opt·server_certfile·/home/me/ssl/erlserver.pem273 ··-ssl_dist_opt·server_certfile·/home/me/ssl/erlserver.pem
274 ··-ssl_dist_opt·server_secure_renegotiate·true·client_secure_renegotiate·true&quot;</span><span·class="w">274 ··-ssl_dist_opt·server_secure_renegotiate·true·client_secure_renegotiate·true&quot;</span><span·class="w">
275 </span><span·class="sc">$·</span><span·class="ss">export</span><span·class="w">·</span><span·class="n">ERL_FLAGS</span><span·class="w">275 </span><span·class="sc">$·</span><span·class="ss">export</span><span·class="w">·</span><span·class="n">ERL_FLAGS</span><span·class="w">
276 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">sname</span><span·class="w">·</span><span·class="ss">ssl_test</span><span·class="w">276 </span><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">sname</span><span·class="w">·</span><span·class="ss">ssl_test</span><span·class="w">
277 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="7037591442-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="7037591442-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·156,·SHA:·132b866e228a9b4a91841e9f00a04e3d1eb5d70bf613e403ff9e0a449d0afe1d·...·]-2">]</span><span·class="w">277 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="0621759131-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="0621759131-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·156,·SHA:·43ac07aa6acc223aa1ecee1848a14d3619c03db805c5665985008b27c70034b8·...·]-2">]</span><span·class="w">
  
278 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">··</span><span·class="p"·data-group-id="7037591442-3">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7037591442-3">)</span><span·class="gp·unselectable">278 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">··</span><span·class="p"·data-group-id="0621759131-3">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0621759131-3">)</span><span·class="gp·unselectable">
279 (ssl_test@myhost)1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_arguments</span><span·class="p"·data-group-id="7037591442-4">(</span><span·class="p"·data-group-id="7037591442-4">)</span><span·class="p">.</span><span·class="w">279 (ssl_test@myhost)1&gt;·</span><span·class="nc">init</span><span·class="p">:</span><span·class="nf">get_arguments</span><span·class="p"·data-group-id="0621759131-4">(</span><span·class="p"·data-group-id="0621759131-4">)</span><span·class="p">.</span><span·class="w">
280 </span><span·class="p"·data-group-id="7037591442-5">[</span><span·class="p"·data-group-id="7037591442-6">{</span><span·class="ss">root</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-7">[</span><span·class="s">&quot;/usr/local/erlang&quot;</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·4896392d7e38385787c6ec69c82e794bbfe146ea96f64dc04a5e8825296d4b47·...·]-6">}</span><span·class="p">,</span><span·class="w">280 </span><span·class="p"·data-group-id="0621759131-5">[</span><span·class="p"·data-group-id="0621759131-6">{</span><span·class="ss">root</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-7">[</span><span·class="s">&quot;/usr/local/erlang&quot;</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·75aeabfa41e3cb710f140f6b99df76a1f6a35b5e1df56b2dcf676d0e6b3c18ac·...·]-6">}</span><span·class="p">,</span><span·class="w">
281 ·</span><span·class="p"·data-group-id="7037591442-8">{</span><span·class="ss">progname</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-9">[</span><span·class="s">&quot;erl·&quot;</span><span·class="p"·data-group-id="7037591442-9">]</span><span·class="p"·data-group-id="70[·...·truncated·by·diffoscope;·len:·8,·SHA:·7a1aba5e65c55a5ab783d912ce1fc4d335aee945c6bdb379130121400a1b31ef·...·]-8">}</span><span·class="p">,</span><span·class="w">281 ·</span><span·class="p"·data-group-id="0621759131-8">{</span><span·class="ss">progname</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-9">[</span><span·class="s">&quot;erl·&quot;</span><span·class="p"·data-group-id="0621759131-9">]</span><span·class="p"·data-group-id="06[·...·truncated·by·diffoscope;·len:·8,·SHA:·d30df49f62970089c4b1cb10ecde1f96d4257b33b719c7740cbedc7d451d5b5f·...·]-8">}</span><span·class="p">,</span><span·class="w">
282 ·</span><span·class="p"·data-group-id="7037591442-10">{</span><span·class="ss">sname</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-11">[</span><span·class="s">&quot;ssl_test&quot;</span><span·class="p"·data-group-id="7037591442-11">]</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·bddc1cd800de9523a7a0ed5e80b25627f5d5b2c71e443a8f10001375a78fbed6·...·]-10">}</span><span·class="p">,</span><span·class="w">282 ·</span><span·class="p"·data-group-id="0621759131-10">{</span><span·class="ss">sname</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-11">[</span><span·class="s">&quot;ssl_test&quot;</span><span·class="p"·data-group-id="0621759131-11">]</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·76cdb2df7f2913b00bbc28a90d390d27ebf102fbf0c41662f505c6a86dd7d74c·...·]-10">}</span><span·class="p">,</span><span·class="w">
283 ·</span><span·class="p"·data-group-id="7037591442-12">{</span><span·class="ss">boot</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-13">[</span><span·class="s">&quot;/home/me/ssl/start_ssl&quot;</span><span·class="p"·data-group-id="7037591442-13">]</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·27b1336696d2c164e7a474ab25866a4f7d0b729bb295b863b2203ff93e329dbf·...·]-12">}</span><span·class="p">,</span><span·class="w">283 ·</span><span·class="p"·data-group-id="0621759131-12">{</span><span·class="ss">boot</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-13">[</span><span·class="s">&quot;/home/me/ssl/start_ssl&quot;</span><span·class="p"·data-group-id="0621759131-13">]</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·25,·SHA:·0a60f5080f0585ca3e0213f83eaaf33fef273762d326d46c381c80be02302bb9·...·]-12">}</span><span·class="p">,</span><span·class="w">
284 ·</span><span·class="p"·data-group-id="7037591442-14">{</span><span·class="ss">proto_dist</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-15">[</span><span·class="s">&quot;inet_tls&quot;</span><span·class="p"·data-group-id="7037591442-15">]</span><span·class="p"·data-group-id="7037591442-14">}</span><span·class="p">,</span><span·class="w"> 
285 ·</span><span·class="p"·data-group-id="7037591442-16">{</span><span·class="ss">ssl_dist_opt</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-17">[</span><span·class="s">&quot;server_certfile&quot;</span><span·class="p">,</span><span·class="s">&quot;/home/me/ssl/erlserver.pem&quot;</span><span·class="p"·data-group-id="7037591442-17">]</span><span·class="p"·data-group-id="7037591442-16">}</span><span·class="p">,</span><span·class="w"> 
286 ·</span><span·class="p"·data-group-id="7037591442-18">{</span><span·class="ss">ssl_dist_opt</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-19">[</span><span·class="s">&quot;server_secure_renegotiate&quot;</span><span·class="p">,</span><span·class="s">&quot;true&quot;</span><span·class="p">,</span><span·class="w">284 ·</span><span·class="p"·data-group-id="0621759131-14">{</span><span·class="ss">proto_dist</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-15">[</span><span·class="s">&quot;inet_tls&quot;</span><span·class="p"·data-group-id="0621759131-15">]</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·23,·SHA:·bd53255eb788ed88cc820ef4871cfc7a2725647fa8738b3b5b4ab1aef6b8544d·...·]</span><span·class="p">,</span><span·class="w">
 285 ·</span><span·class="p"·data-group-id="0621759131-16">{</span><span·class="ss">ssl_dist_opt</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-17">[</span><span·class="s">&quot;server_certfile&quot;</span><span·class="p">,</span><span·class="s">&quot;/home/me/ssl/erlserver.pem&quot;</span><span·class="p"·data-group-id="0621759131-17">]</span><span·class="p"·data-group-id="0621759131-16">}</span><span·class="p">,</span><span·class="w">
 286 ·</span><span·class="p"·data-group-id="0621759131-18">{</span><span·class="ss">ssl_dist_opt</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-19">[</span><span·class="s">&quot;server_secure_renegotiate&quot;</span><span·class="p">,</span><span·class="s">&quot;true&quot;</span><span·class="p">,</span><span·class="w">
287 ················</span><span·class="s">&quot;client_secure_renegotiate&quot;</span><span·class="p">,</span><span·class="s">&quot;true&quot;</span><span·class="p"·data-group-id="7037591442-19">]</span><span·class="w">287 ················</span><span·class="s">&quot;client_secure_renegotiate&quot;</span><span·class="p">,</span><span·class="s">&quot;true&quot;</span><span·class="p"·data-group-id="0621759131-19">]</span><span·class="w">
288 ·</span><span·class="p"·data-group-id="7037591442-20">{</span><span·class="ss">home</span><span·class="p">,</span><span·class="p"·data-group-id="7037591442-21">[</span><span·class="s">&quot;/home/me&quot;</span><span·class="p"·data-group-id="7037591442-21">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·1eb3ee9d1b16661882c26fcd1a5f11157be6758bbcf62163c508d83f22a4fb77·...·]-20">}</span><span·class="p">]</span></code></pre><p>The·<code·class="inline">init:get_arguments()</code>·call·verifies·that·the·correct·arguments·are·supplied288 ·</span><span·class="p"·data-group-id="0621759131-20">{</span><span·class="ss">home</span><span·class="p">,</span><span·class="p"·data-group-id="0621759131-21">[</span><span·class="s">&quot;/home/me&quot;</span><span·class="p"·data-group-id="0621759131-21">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·cf84f46f0b7faf807515ac3c0533f98e08b33ebc2a4ebcd580cd864befd01361·...·]-20">}</span><span·class="p">]</span></code></pre><p>The·<code·class="inline">init:get_arguments()</code>·call·verifies·that·the·correct·arguments·are·supplied
289 to·the·emulator.</p>289 to·the·emulator.</p>
290 </div>290 </div>
  
291 <div·class="bottom-actions"·id="bottom-actions">291 <div·class="bottom-actions"·id="bottom-actions">
292 ··<div·class="bottom-actions-item">292 ··<div·class="bottom-actions-item">
  
293 ······<a·href="using_ssl.html"·class="bottom-actions-button"·rel="prev">293 ······<a·href="using_ssl.html"·class="bottom-actions-button"·rel="prev">
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337 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>337 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
338 ······</p>338 ······</p>
339 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>339 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
340 ····</footer>340 ····</footer>
341 ··</div>341 ··</div>
342 </main>342 </main>
343 </div>343 </div>
344 <script>344 <script>
345 ··function·mermaidLoaded()·{345 ··function·mermaidLoaded()·{
346 ····mermaid.initialize({346 ····mermaid.initialize({
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278 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>278 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
279 ······</p>279 ······</p>
280 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>280 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
281 ····</footer>281 ····</footer>
282 ··</div>282 ··</div>
283 </main>283 </main>
284 </div>284 </div>
285 <script>285 <script>
286 ··function·mermaidLoaded()·{286 ··function·mermaidLoaded()·{
287 ····mermaid.initialize({287 ····mermaid.initialize({
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698 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>698 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
699 ······</p>699 ······</p>
700 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>700 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
701 ····</footer>701 ····</footer>
702 ··</div>702 ··</div>
703 </main>703 </main>
704 </div>704 </div>
705 <script>705 <script>
706 ··function·mermaidLoaded()·{706 ··function·mermaidLoaded()·{
707 ····mermaid.initialize({707 ····mermaid.initialize({
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259 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>259 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
260 ······</p>260 ······</p>
261 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>261 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
262 ····</footer>262 ····</footer>
263 ··</div>263 ··</div>
264 </main>264 </main>
265 </div>265 </div>
266 <script>266 <script>
267 ··function·mermaidLoaded()·{267 ··function·mermaidLoaded()·{
268 ····mermaid.initialize({268 ····mermaid.initialize({
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147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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827 ······</p>827 ······</p>
828 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>828 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
829 ····</footer>829 ····</footer>
830 ··</div>830 ··</div>
831 </main>831 </main>
832 </div>832 </div>
833 <script>833 <script>
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143 ··</a>143 ··</a>
144 ··<span·class="text">Quick·start</span>144 ··<span·class="text">Quick·start</span>
145 </h2>145 </h2>
146 <p><code·class="inline">argparse</code>·is·designed·to·work·with·<a·href="../../../../erts-15.2.6/doc/html/escript_cmd.html"><code·class="inline">escript</code></a>.·The146 <p><code·class="inline">argparse</code>·is·designed·to·work·with·<a·href="../../../../erts-15.2.6/doc/html/escript_cmd.html"><code·class="inline">escript</code></a>.·The
147 example·below·is·a·fully·functioning·Erlang·program·accepting·two·command·line147 example·below·is·a·fully·functioning·Erlang·program·accepting·two·command·line
148 arguments·and·printing·their·product.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ch">#!/usr/bin/env·escript148 arguments·and·printing·their·product.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ch">#!/usr/bin/env·escript
149 </span><span·class="w">149 </span><span·class="w">
150 </span><span·class="nf">main</span><span·class="p"·data-group-id="9609777104-1">(</span><span·class="n">Args</span><span·class="p"·data-group-id="9609777104-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">150 </span><span·class="nf">main</span><span·class="p"·data-group-id="6933503224-1">(</span><span·class="n">Args</span><span·class="p"·data-group-id="6933503224-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
151 ····</span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="9609777104-2">(</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">cli</span><span·class="p"·data-group-id="9609777104-3">(</span><span·class="p"·data-group-id="9609777104-3">)</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·304,·SHA:·5516e3007e18e6b23a985e040e172795f1ee742567bdf0587e25377554447fd7·...·]4-2">)</span><span·class="p">.</span><span·class="w">151 ····</span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="6933503224-2">(</span><span·class="n">Args</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">cli</span><span·class="p"·data-group-id="6933503224-3">(</span><span·class="p"·data-group-id="6933503224-3">)</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·304,·SHA:·76f44f4b9043bf80e54d0c1936fff4eba3e56f7c2e0ebc28ba5275d507594aa2·...·]4-2">)</span><span·class="p">.</span><span·class="w">
  
152 </span><span·class="nf">cli</span><span·class="p"·data-group-id="9609777104-5">(</span><span·class="p"·data-group-id="9609777104-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">152 </span><span·class="nf">cli</span><span·class="p"·data-group-id="6933503224-5">(</span><span·class="p"·data-group-id="6933503224-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
153 ····</span><span·class="p"·data-group-id="9609777104-6">#{</span><span·class="w">153 ····</span><span·class="p"·data-group-id="6933503224-6">#{</span><span·class="w">
154 ········</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9609777104-7">[</span><span·class="w">154 ········</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6933503224-7">[</span><span·class="w">
155 ············</span><span·class="p"·data-group-id="9609777104-8">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">left</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·122,·SHA:·50da043be33a7a530bba45497ab224178213a0a01472ae8e777cae3cb9447a95·...·]4-8">}</span><span·class="p">,</span><span·class="w">155 ············</span><span·class="p"·data-group-id="6933503224-8">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">left</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·122,·SHA:·98d951f7efab915246f9d2abe1ab15381fd9e64609b149b1e10ce4a839a5b4f2·...·]4-8">}</span><span·class="p">,</span><span·class="w">
156 ············</span><span·class="p"·data-group-id="9609777104-9">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">right</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·123,·SHA:·1f0746d4b9d636877b312ab9104fe66489f3c9d5b54bdabfee5b264b3fa00d6a·...·]4-9">}</span><span·class="w">156 ············</span><span·class="p"·data-group-id="6933503224-9">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">right</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">type</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·123,·SHA:·23f8286ed5c86307c6a5c97223863f7767e34765959173fd9423d073a998b362·...·]4-9">}</span><span·class="w">
157 ········</span><span·class="p"·data-group-id="9609777104-7">]</span><span·class="p">,</span><span·class="w">157 ········</span><span·class="p"·data-group-id="6933503224-7">]</span><span·class="p">,</span><span·class="w">
158 ········</span><span·class="ss">handler</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">158 ········</span><span·class="ss">handler</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">
159 ············</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9609777104-10">(</span><span·class="p"·data-group-id="9609777104-11">#{</span><span·class="ss">left</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Left</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·222,·SHA:·66d39e6ab7b41ce3efa688e2c940deade8594b4c4fedf94480001f8a3dca3da8·...·]4-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">159 ············</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6933503224-10">(</span><span·class="p"·data-group-id="6933503224-11">#{</span><span·class="ss">left</span><span·class="w">·</span><span·class="p">:=</span><span·class="w">·</span><span·class="n">Left</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·222,·SHA:·37366a0b4843d7f14bbfb57aad7331337a6933d4316bdf55b09892051928a36c·...·]4-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
160 ················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9609777104-12">(</span><span·class="s">&quot;</span><span·class="si">~b</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9609777104-13">[</span><span·class="n">Left<[·...·truncated·by·diffoscope;·len:·200,·SHA:·60f2c7505c0b8851c3cbd2ef39c07429e34d883597f07f8b7f7668bf74b79623·...·]4-12">)</span><span·class="w">160 ················</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="6933503224-12">(</span><span·class="s">&quot;</span><span·class="si">~b</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6933503224-13">[</span><span·class="n">Left<[·...·truncated·by·diffoscope;·len:·200,·SHA:·d1c4bab7693de9d4b14eaf2b9524c7b5f41cb18e5002e57aae1c632355b5ce2e·...·]4-12">)</span><span·class="w">
161 ············</span><span·class="k">end</span><span·class="w">161 ············</span><span·class="k">end</span><span·class="w">
162 ····</span><span·class="p"·data-group-id="9609777104-6">}</span><span·class="p">.</span></code></pre><p>Running·this·script·with·no·arguments·results·in·an·error,·accompanied·by·the162 ····</span><span·class="p"·data-group-id="6933503224-6">}</span><span·class="p">.</span></code></pre><p>Running·this·script·with·no·arguments·results·in·an·error,·accompanied·by·the
163 usage·information.</p><p>The·<code·class="inline">cli</code>·function·defines·a·single·command·with·embedded·handler·accepting·a163 usage·information.</p><p>The·<code·class="inline">cli</code>·function·defines·a·single·command·with·embedded·handler·accepting·a
164 map.·Keys·of·the·map·are·argument·names·as·defined·by·the·<code·class="inline">argument</code>·field·of164 map.·Keys·of·the·map·are·argument·names·as·defined·by·the·<code·class="inline">argument</code>·field·of
165 the·command,·<code·class="inline">left</code>·and·<code·class="inline">right</code>·in·the·example.·Values·are·taken·from·the165 the·command,·<code·class="inline">left</code>·and·<code·class="inline">right</code>·in·the·example.·Values·are·taken·from·the
166 command·line,·and·converted·into·integers,·as·requested·by·the·type166 command·line,·and·converted·into·integers,·as·requested·by·the·type
167 specification.·Both·arguments·in·the·example·above·are·required·(and·therefore167 specification.·Both·arguments·in·the·example·above·are·required·(and·therefore
168 defined·as·positional).</p><h2·id="module-command-hierarchy"·class="section-heading">168 defined·as·positional).</p><h2·id="module-command-hierarchy"·class="section-heading">
169 ··<a·href="#module-command-hierarchy"·class="hover-link">169 ··<a·href="#module-command-hierarchy"·class="hover-link">
170 ····<i·class="ri-link-m"·aria-hidden="true"></i>170 ····<i·class="ri-link-m"·aria-hidden="true"></i>
171 ··</a>171 ··</a>
172 ··<span·class="text">Command·hierarchy</span>172 ··<span·class="text">Command·hierarchy</span>
173 </h2>173 </h2>
174 <p>A·command·may·contain·nested·commands,·forming·a·hierarchy.·Arguments·defined·at174 <p>A·command·may·contain·nested·commands,·forming·a·hierarchy.·Arguments·defined·at
175 the·upper·level·command·are·automatically·added·to·all·nested·commands.·Nested175 the·upper·level·command·are·automatically·added·to·all·nested·commands.·Nested
176 commands·example·(assuming·<code·class="inline">progname</code>·is·<code·class="inline">nested</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">cli</span><span·class="p"·data-group-id="6853317079-1">(</span><span·class="p"·data-group-id="6853317079-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">176 commands·example·(assuming·<code·class="inline">progname</code>·is·<code·class="inline">nested</code>):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">cli</span><span·class="p"·data-group-id="6492606111-1">(</span><span·class="p"·data-group-id="6492606111-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
177 ··</span><span·class="p"·data-group-id="6853317079-2">#{</span><span·class="w">177 ··</span><span·class="p"·data-group-id="6492606111-2">#{</span><span·class="w">
178 ····</span><span·class="c1">%%·top·level·argument·applicable·to·all·commands</span><span·class="w">178 ····</span><span·class="c1">%%·top·level·argument·applicable·to·all·commands</span><span·class="w">
179 ····</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-3">[</span><span·class="p"·data-group-id="6853317079-4">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">top</span><span·class="p"·data-group-id="6853317079-4">}</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·94fa9a3bafc7457484b18bd23bc74a653c83836abe54847eb0f338f8d33cdf7e·...·]-3">]</span><span·class="p">,</span><span·class="w">179 ····</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-3">[</span><span·class="p"·data-group-id="6492606111-4">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">top</span><span·class="p"·data-group-id="6492606111-4">}</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·c7f0bb4a465aa7eabb7f5ba030df7bced408437fc2026f45760f3ed2543ce850·...·]-3">]</span><span·class="p">,</span><span·class="w">
180 ······</span><span·class="ss">commands</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-5">#{</span><span·class="w">180 ······</span><span·class="ss">commands</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-5">#{</span><span·class="w">
181 ········</span><span·class="s">&quot;first&quot;</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-6">#{</span><span·class="w">181 ········</span><span·class="s">&quot;first&quot;</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-6">#{</span><span·class="w">
182 ··········</span><span·class="c1">%%·argument·applicable·to·&quot;first&quot;·command·and</span><span·class="w">182 ··········</span><span·class="c1">%%·argument·applicable·to·&quot;first&quot;·command·and</span><span·class="w">
183 ··········</span><span·class="c1">%%··all·commands·nested·into·&quot;first&quot;</span><span·class="w">183 ··········</span><span·class="c1">%%··all·commands·nested·into·&quot;first&quot;</span><span·class="w">
184 ··········</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-7">[</span><span·class="p"·data-group-id="6853317079-8">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">mid</span><span·class="p"·data-group-id="6853317079-8">}</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·94fa9a3bafc7457484b18bd23bc74a653c83836abe54847eb0f338f8d33cdf7e·...·]-7">]</span><span·class="p">,</span><span·class="w">184 ··········</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-7">[</span><span·class="p"·data-group-id="6492606111-8">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">mid</span><span·class="p"·data-group-id="6492606111-8">}</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·c7f0bb4a465aa7eabb7f5ba030df7bced408437fc2026f45760f3ed2543ce850·...·]-7">]</span><span·class="p">,</span><span·class="w">
185 ··········</span><span·class="ss">commands</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-9">#{</span><span·class="w">185 ··········</span><span·class="ss">commands</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-9">#{</span><span·class="w">
186 ············</span><span·class="s">&quot;second&quot;</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-10">#{</span><span·class="w">186 ············</span><span·class="s">&quot;second&quot;</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-10">#{</span><span·class="w">
187 ··············</span><span·class="c1">%%·argument·only·applicable·for·&quot;second&quot;·command</span><span·class="w">187 ··············</span><span·class="c1">%%·argument·only·applicable·for·&quot;second&quot;·command</span><span·class="w">
188 ··············</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-11">[</span><span·class="p"·data-group-id="6853317079-12">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">bottom</span><span·class="p"·data-group-id="6853317079-12"[·...·truncated·by·diffoscope;·len:·50,·SHA:·b59011d6825d0924918d10603107036f2c4ef944f80faadd2142f2be641f0ac3·...·]-11">]</span><span·class="p">,</span><span·class="w">188 ··············</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-11">[</span><span·class="p"·data-group-id="6492606111-12">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">bottom</span><span·class="p"·data-group-id="6492606111-12"[·...·truncated·by·diffoscope;·len:·50,·SHA:·600660a28f2e6582e5fd84143344c674b36d0de6752a3e0c0221a09b645219b6·...·]-11">]</span><span·class="p">,</span><span·class="w">
189 ··············</span><span·class="ss">handler</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6853317079-13">(</span><span·class="n">A</span><span·class="p"·data-group-id="6853317079-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span>[·...·truncated·by·diffoscope;·len:·385,·SHA:·74b91e2cf00ed8a50f51ee7a9cb2f9c08eefcb911bbb6e701fa99dad3e0dee64·...·]-14">)</span><span·class="w">·</span><span·class="k">end</span><span·class="w">189 ··············</span><span·class="ss">handler</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6492606111-13">(</span><span·class="n">A</span><span·class="p"·data-group-id="6492606111-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span>[·...·truncated·by·diffoscope;·len:·385,·SHA:·49ed361185242b6ef43a7772cdfa9aa30c6008544320864cc75e19da8603ca1a·...·]-14">)</span><span·class="w">·</span><span·class="k">end</span><span·class="w">
190 ··········</span><span·class="p"·data-group-id="6853317079-10">}</span><span·class="w">190 ··········</span><span·class="p"·data-group-id="6492606111-10">}</span><span·class="w">
191 ········</span><span·class="p"·data-group-id="6853317079-9">}</span><span·class="w">191 ········</span><span·class="p"·data-group-id="6492606111-9">}</span><span·class="w">
192 ······</span><span·class="p"·data-group-id="6853317079-6">}</span><span·class="w">192 ······</span><span·class="p"·data-group-id="6492606111-6">}</span><span·class="w">
193 ····</span><span·class="p"·data-group-id="6853317079-5">}</span><span·class="w">193 ····</span><span·class="p"·data-group-id="6492606111-5">}</span><span·class="w">
194 ··</span><span·class="p"·data-group-id="6853317079-2">}</span><span·class="p">.</span></code></pre><p>In·the·example·above,·a·3-level·hierarchy·is·defined.·First·is·the·script·itself194 ··</span><span·class="p"·data-group-id="6492606111-2">}</span><span·class="p">.</span></code></pre><p>In·the·example·above,·a·3-level·hierarchy·is·defined.·First·is·the·script·itself
195 (<code·class="inline">nested</code>),·accepting·the·only·argument·<code·class="inline">top</code>.·Since·it·has·no·associated195 (<code·class="inline">nested</code>),·accepting·the·only·argument·<code·class="inline">top</code>.·Since·it·has·no·associated
196 handler,·<a·href="#run/3"><code·class="inline">run/3</code></a>·will·not·accept·user·input·omitting·nested·command·selection.196 handler,·<a·href="#run/3"><code·class="inline">run/3</code></a>·will·not·accept·user·input·omitting·nested·command·selection.
197 For·this·example,·user·has·to·supply·5·arguments·in·the·command·line,·two·being197 For·this·example,·user·has·to·supply·5·arguments·in·the·command·line,·two·being
198 command·names,·and·another·3·-·required·positional·arguments:</p><pre><code·class="text">./nested.erl·one·first·second·two·three198 command·names,·and·another·3·-·required·positional·arguments:</p><pre><code·class="text">./nested.erl·one·first·second·two·three
199 #{top·=&gt;·&quot;one&quot;,mid·=&gt;·&quot;two&quot;,bottom·=&gt;·&quot;three&quot;}</code></pre><p>Commands·have·preference·over·positional·argument·values.·In·the·example·above,199 #{top·=&gt;·&quot;one&quot;,mid·=&gt;·&quot;two&quot;,bottom·=&gt;·&quot;three&quot;}</code></pre><p>Commands·have·preference·over·positional·argument·values.·In·the·example·above,
200 commands·and·positional·arguments·are·interleaving,·and·<code·class="inline">argparse</code>·matches200 commands·and·positional·arguments·are·interleaving,·and·<code·class="inline">argparse</code>·matches
201 command·name·first.</p><h2·id="module-arguments"·class="section-heading">201 command·name·first.</p><h2·id="module-arguments"·class="section-heading">
Offset 206, 22 lines modifiedOffset 206, 22 lines modified
206 ··<span·class="text">Arguments</span>206 ··<span·class="text">Arguments</span>
207 </h2>207 </h2>
208 <p><code·class="inline">argparse</code>·supports·positional·and·optional·arguments.·Optional·arguments,·or208 <p><code·class="inline">argparse</code>·supports·positional·and·optional·arguments.·Optional·arguments,·or
209 options·for·short,·must·be·prefixed·with·a·special·character·(<code·class="inline">-</code>·is·the·default209 options·for·short,·must·be·prefixed·with·a·special·character·(<code·class="inline">-</code>·is·the·default
210 on·all·operating·systems).·Both·options·and·positional·arguments·have·1·or·more210 on·all·operating·systems).·Both·options·and·positional·arguments·have·1·or·more
211 associated·values.·See·<a·href="#t:argument/0"><code·class="inline">argument·specification</code></a>·to·find·more211 associated·values.·See·<a·href="#t:argument/0"><code·class="inline">argument·specification</code></a>·to·find·more
212 details·about·supported·combinations.</p><p>In·the·user·input,·short·options·may·be·concatenated·with·their·values.·Long212 details·about·supported·combinations.</p><p>In·the·user·input,·short·options·may·be·concatenated·with·their·values.·Long
213 options·support·values·separated·by·<code·class="inline">=</code>.·Consider·this·definition:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">cli</span><span·class="p"·data-group-id="1109755790-1">(</span><span·class="p"·data-group-id="1109755790-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">213 options·support·values·separated·by·<code·class="inline">=</code>.·Consider·this·definition:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">cli</span><span·class="p"·data-group-id="4836206333-1">(</span><span·class="p"·data-group-id="4836206333-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
214 ··</span><span·class="p"·data-group-id="1109755790-2">#{</span><span·class="w">214 ··</span><span·class="p"·data-group-id="4836206333-2">#{</span><span·class="w">
215 ····</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1109755790-3">[</span><span·class="w">215 ····</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4836206333-3">[</span><span·class="w">
216 ······</span><span·class="p"·data-group-id="1109755790-4">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">long</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">long</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·132,·SHA:·1262db3f25d6d7ef91c39d57106cc3e43fef98db86b49d7218937c4736fcbb9a·...·]-4">}</span><span·class="p">,</span><span·class="w">216 ······</span><span·class="p"·data-group-id="4836206333-4">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">long</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">long</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·132,·SHA:·d9f3f20f98da561a1c90d44fa82c68fcd00210d24edaf03d0975b895689834fe·...·]-4">}</span><span·class="p">,</span><span·class="w">
217 ······</span><span·class="p"·data-group-id="1109755790-5">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">short</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">short</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·120,·SHA:·21fb0f9cb9b3e0185e5eda1c3e3af394213042df53939e7c7f40f7bd6ce01542·...·]-5">}</span><span·class="w">217 ······</span><span·class="p"·data-group-id="4836206333-5">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">short</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">short</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·120,·SHA:·80fc997eff0bee5dde066ca2432b16c24782dbedc48b2ae335eae8bbad3af48f·...·]-5">}</span><span·class="w">
218 ····</span><span·class="p"·data-group-id="1109755790-3">]</span><span·class="p">,</span><span·class="w">218 ····</span><span·class="p"·data-group-id="4836206333-3">]</span><span·class="p">,</span><span·class="w">
219 ····</span><span·class="ss">handler</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1109755790-6">(</span><span·class="n">Args</span><span·class="p"·data-group-id="1109755790-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</spa[·...·truncated·by·diffoscope;·len:·387,·SHA:·1fcc8884646e1faf3513a1e4845c506c65c79fd50359abc0e3b7e5166a670d67·...·]-7">)</span><span·class="w">·</span><span·class="k">end</span><span·class="w">219 ····</span><span·class="ss">handler</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="4836206333-6">(</span><span·class="n">Args</span><span·class="p"·data-group-id="4836206333-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</spa[·...·truncated·by·diffoscope;·len:·387,·SHA:·f61129ce11867b83008e8934fb8d55c7885199bd594abc1fb37a800673570e5f·...·]-7">)</span><span·class="w">·</span><span·class="k">end</span><span·class="w">
220 ··</span><span·class="p"·data-group-id="1109755790-2">}</span><span·class="p">.</span></code></pre><p>Running·<code·class="inline">./args·--long=VALUE</code>·prints·<code·class="inline">#{long·=&gt;·&quot;VALUE&quot;}</code>,·running220 ··</span><span·class="p"·data-group-id="4836206333-2">}</span><span·class="p">.</span></code></pre><p>Running·<code·class="inline">./args·--long=VALUE</code>·prints·<code·class="inline">#{long·=&gt;·&quot;VALUE&quot;}</code>,·running
221 <code·class="inline">./args·-sVALUE</code>·prints·<code·class="inline">#{short·=&gt;·&quot;VALUE&quot;}</code></p><p><code·class="inline">argparse</code>·supports·boolean·flags·concatenation:·it·is·possible·to·shorten221 <code·class="inline">./args·-sVALUE</code>·prints·<code·class="inline">#{short·=&gt;·&quot;VALUE&quot;}</code></p><p><code·class="inline">argparse</code>·supports·boolean·flags·concatenation:·it·is·possible·to·shorten
222 <code·class="inline">-r·-f·-v</code>·to·<code·class="inline">-rfv</code>.</p><p>Shortened·option·names·are·not·supported:·it·is·not·possible·to·use·<code·class="inline">--my-argum</code>222 <code·class="inline">-r·-f·-v</code>·to·<code·class="inline">-rfv</code>.</p><p>Shortened·option·names·are·not·supported:·it·is·not·possible·to·use·<code·class="inline">--my-argum</code>
223 instead·of·<code·class="inline">--my-argument-name</code>·even·when·such·option·can·be·unambiguously223 instead·of·<code·class="inline">--my-argument-name</code>·even·when·such·option·can·be·unambiguously
224 found.</p>224 found.</p>
225 ····</section>225 ····</section>
  
226 </div>226 </div>
Offset 598, 119 lines modifiedOffset 598, 119 lines modified
598 as·optional.·Optional·arguments·do·not·have·specific·order·and·may·appear598 as·optional.·Optional·arguments·do·not·have·specific·order·and·may·appear
599 anywhere·in·the·command·line.·Positional·arguments·are·ordered·the·same·way·as599 anywhere·in·the·command·line.·Positional·arguments·are·ordered·the·same·way·as
600 they·appear·in·the·arguments·list·of·the·command·specification.</p><p>By·default,·all·positional·arguments·must·be·present·in·the·command·line.·The600 they·appear·in·the·arguments·list·of·the·command·specification.</p><p>By·default,·all·positional·arguments·must·be·present·in·the·command·line.·The
601 parser·will·return·an·error·otherwise.·Options,·however,·may·be·omitted,·in601 parser·will·return·an·error·otherwise.·Options,·however,·may·be·omitted,·in
602 which·case·resulting·argument·map·will·either·contain·the·default·value,·or·not602 which·case·resulting·argument·map·will·either·contain·the·default·value,·or·not
603 have·the·key·at·all.</p><ul><li><p><strong><code·class="inline">name</code></strong>·-·Sets·the·argument·name·in·the·parsed·argument·map.·If·<code·class="inline">help</code>·is603 have·the·key·at·all.</p><ul><li><p><strong><code·class="inline">name</code></strong>·-·Sets·the·argument·name·in·the·parsed·argument·map.·If·<code·class="inline">help</code>·is
604 not·defined,·name·is·also·used·to·generate·the·default·usage·message.</p></li><li><p><strong><code·class="inline">short</code></strong>·-·Defines·a·short·(single·character)·form·of·an·optional·argument.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Define·a·command·accepting·argument·named·myarg,·with·short·form·$a:</span><span·class="gp·unselectable">604 not·defined,·name·is·also·used·to·generate·the·default·usage·message.</p></li><li><p><strong><code·class="inline">short</code></strong>·-·Defines·a·short·(single·character)·form·of·an·optional·argument.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Define·a·command·accepting·argument·named·myarg,·with·short·form·$a:</span><span·class="gp·unselectable">
605 1&gt;·</span><span·class="n">Cmd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1341833461-1">#{</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1341833461-2">[</span><span·class="p"·data-group-id="1341833461-3">#{</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·442,·SHA:·28b81e3a12563863b3602c2441b5d5f09e8ad8cdb19ee6d01a7a2565778a54e6·...·]-1">}</span><span·class="p">.</span><span·class="w">605 1&gt;·</span><span·class="n">Cmd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3788580988-1">#{</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3788580988-2">[</span><span·class="p"·data-group-id="3788580988-3">#{</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·442,·SHA:·677a0be1d33bf1f6fbea78d94c43423066d9a1fd5265cee36a02546474addbdd·...·]-1">}</span><span·class="p">.</span><span·class="w">
606 </span><span·class="c1">%%·Parse·command·line·&quot;-a·str&quot;:</span><span·class="gp·unselectable">606 </span><span·class="c1">%%·Parse·command·line·&quot;-a·str&quot;:</span><span·class="gp·unselectable">
607 2&gt;·</span><span·class="p"·data-group-id="1341833461-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·620,·SHA:·9298019402cacf0c12b3d96c7a5e14c03793a7f8b6a9044b4ca85bbc79ca0089·...·]-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">607 2&gt;·</span><span·class="p"·data-group-id="3788580988-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·620,·SHA:·3968818ea193decc9cd20d00cefbe9a5946fda24c59380582ea512303928ef2c·...·]-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">
  
608 </span><span·class="p"·data-group-id="1341833461-7">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;str&quot;</span><span·class="p"·data-group-id="1341833461-7">}</span><span·class="w">608 </span><span·class="p"·data-group-id="3788580988-7">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;str&quot;</span><span·class="p"·data-group-id="3788580988-7">}</span><span·class="w">
  
609 </span><span·class="c1">%%·Option·value·can·be·concatenated·with·the·switch:·&quot;-astr&quot;</span><span·class="gp·unselectable">609 </span><span·class="c1">%%·Option·value·can·be·concatenated·with·the·switch:·&quot;-astr&quot;</span><span·class="gp·unselectable">
610 3&gt;·</span><span·class="p"·data-group-id="1341833461-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·539,·SHA:·51fe6014fd755d7c9ed6665ccf7118affc068a0d0b27692faba15cb77e1ea674·...·]-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">610 3&gt;·</span><span·class="p"·data-group-id="3788580988-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·539,·SHA:·a976651d3db9c9b6797ed5536ff7ad41798b906ba5afd773667c7238ead30e29·...·]-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">
  
611 </span><span·class="p"·data-group-id="1341833461-11">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;str&quot;</span><span·class="p"·data-group-id="1341833461-11">}</span></code></pre><p>By·default·all·options·expect·a·single·value·following·the·option·switch.·The611 </span><span·class="p"·data-group-id="3788580988-11">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;str&quot;</span><span·class="p"·data-group-id="3788580988-11">}</span></code></pre><p>By·default·all·options·expect·a·single·value·following·the·option·switch.·The
612 only·exception·is·an·option·of·a·boolean·type.</p></li><li><p><strong><code·class="inline">long</code></strong>·-·Defines·a·long·form·of·an·optional·argument.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Cmd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9840271514-1">#{</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9840271514-2">[</span><span·class="p"·data-group-id="9840271514-3">#{</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·453,·SHA:·cf693d9d24ca6b47c7081fee984099d8e3e5296c200a7a8ff15cbc0fd4131ac8·...·]4-1">}</span><span·class="p">.</span><span·class="w">612 only·exception·is·an·option·of·a·boolean·type.</p></li><li><p><strong><code·class="inline">long</code></strong>·-·Defines·a·long·form·of·an·optional·argument.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Cmd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4041927984-1">#{</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4041927984-2">[</span><span·class="p"·data-group-id="4041927984-3">#{</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·453,·SHA:·2e7d26e0c50bc9f387aa0e9f62ee019810e43cdf2fa24d6a974d402bb3630452·...·]4-1">}</span><span·class="p">.</span><span·class="w">
613 </span><span·class="c1">%%·Parse·command·line·&quot;-name·Erlang&quot;:</span><span·class="gp·unselectable">613 </span><span·class="c1">%%·Parse·command·line·&quot;-name·Erlang&quot;:</span><span·class="gp·unselectable">
614 2&gt;·</span><span·class="p"·data-group-id="9840271514-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·625,·SHA:·54ca1fd94f8be88029d624fe698ac50e5006fedf50851d65369229b60cc4e5f3·...·]4-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">614 2&gt;·</span><span·class="p"·data-group-id="4041927984-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·625,·SHA:·b0264fa12473fef5b7ebe702544408a76962ef832ee0bf13ae90cae75300185c·...·]4-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">
  
615 </span><span·class="p"·data-group-id="9840271514-7">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;Erlang&quot;</span><span·class="p"·data-group-id="9840271514-7">}</span><span·class="w">615 </span><span·class="p"·data-group-id="4041927984-7">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;Erlang&quot;</span><span·class="p"·data-group-id="4041927984-7">}</span><span·class="w">
616 </span><span·class="c1">%%·Or·use·&quot;=&quot;·to·separate·the·switch·and·the·value:</span><span·class="gp·unselectable">616 </span><span·class="c1">%%·Or·use·&quot;=&quot;·to·separate·the·switch·and·the·value:</span><span·class="gp·unselectable">
617 3&gt;·</span><span·class="p"·data-group-id="9840271514-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·545,·SHA:·d9bdf7cf9f62b3ddcdc77e1d7d2d85f238e66b8d6fc15054975eb5de14724801·...·]4-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">617 3&gt;·</span><span·class="p"·data-group-id="4041927984-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·545,·SHA:·16fc6a14a1fa7ce81a63422f773cdaae6f44450ae7e06cfe07f871243a256f0c·...·]4-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArgMap</span><span·class="p">.</span><span·class="w">
  
618 </span><span·class="p"·data-group-id="9840271514-11">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;Erlang&quot;</span><span·class="p"·data-group-id="9840271514-11">}</span></code></pre><p>If·neither·<code·class="inline">short</code>·not·<code·class="inline">long</code>·is·defined,·the·argument·is·treated·as618 </span><span·class="p"·data-group-id="4041927984-11">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;Erlang&quot;</span><span·class="p"·data-group-id="4041927984-11">}</span></code></pre><p>If·neither·<code·class="inline">short</code>·not·<code·class="inline">long</code>·is·defined,·the·argument·is·treated·as
619 positional.</p></li><li><p><strong><code·class="inline">required</code></strong>·-·Forces·the·parser·to·expect·the·argument·to·be·present·in·the619 positional.</p></li><li><p><strong><code·class="inline">required</code></strong>·-·Forces·the·parser·to·expect·the·argument·to·be·present·in·the
620 command·line.·By·default,·all·positional·argument·are·required,·and·all620 command·line.·By·default,·all·positional·argument·are·required,·and·all
621 options·are·not.</p></li><li><p><strong><code·class="inline">default</code></strong>·-·Specifies·the·default·value·to·put·in·the·parsed·argument·map621 options·are·not.</p></li><li><p><strong><code·class="inline">default</code></strong>·-·Specifies·the·default·value·to·put·in·the·parsed·argument·map
622 if·the·value·is·not·supplied·in·the·command·line.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="8659997803-1">(</span><span·class="p"·data-group-id="8659997803-2">[</span><span·class="p"·data-group-id="8659997803-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8659997803-3">#{</span><span·class="ss">arguments[·...·truncated·by·diffoscope;·len:·702,·SHA:·ce088e89e98f88f24112a2cabe5a306cef17a9c02594620fcd175de7c1a0d5f8·...·]-1">)</span><span·class="p">.</span><span·class="w">622 if·the·value·is·not·supplied·in·the·command·line.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="3088243027-1">(</span><span·class="p"·data-group-id="3088243027-2">[</span><span·class="p"·data-group-id="3088243027-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3088243027-3">#{</span><span·class="ss">arguments[·...·truncated·by·diffoscope;·len:·702,·SHA:·d2ffa2917b1912fff84b581b8427dc86b325c0e5b6f1acbb1c467ffb1b5c3854·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
623 </span><span·class="p"·data-group-id="8659997803-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8659997803-7">#{</span><span·class="p"·data-group-id="8659997803-7">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">623 </span><span·class="p"·data-group-id="3088243027-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3088243027-7">#{</span><span·class="p"·data-group-id="3088243027-7">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
624 2&gt;·</span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="8659997803-8">(</span><span·class="p"·data-group-id="8659997803-9">[</span><span·class="p"·data-group-id="8659997803-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8659997803-10">#{</span><span·class="ss">argument[·...·truncated·by·diffoscope;·len:·901,·SHA:·c9f313501095b459128431883acb6a59dbce3107e90154618710da3eb95ca028·...·]-8">)</span><span·class="p">.</span><span·class="w">624 2&gt;·</span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="3088243027-8">(</span><span·class="p"·data-group-id="3088243027-9">[</span><span·class="p"·data-group-id="3088243027-9">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3088243027-10">#{</span><span·class="ss">argument[·...·truncated·by·diffoscope;·len:·901,·SHA:·9fdd9557b9d6e83b7f46a17aec10dc6f606fc25f2be4e02bd19d3d8b9b00b24e·...·]-8">)</span><span·class="p">.</span><span·class="w">
  
625 </span><span·class="p"·data-group-id="8659997803-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="8659997803-14">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;d[·...·truncated·by·diffoscope;·len:·56,·SHA:·ddc5473f324865ddf72ed629fbfd2c57d9085f37ebca5494b01068c78b0381c7·...·]-14">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre></li><li><p><strong><code·class="inline">type</code></strong>·-·Defines·type·conversion·and·validation·routine.·The·default·is625 </span><span·class="p"·data-group-id="3088243027-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3088243027-14">#{</span><span·class="ss">myarg</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;d[·...·truncated·by·diffoscope;·len:·56,·SHA:·5a2d3898cfe16095838c6b679d4f18e44ebd622cf6afe5f9d4f47afe2066ce84·...·]-14">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre></li><li><p><strong><code·class="inline">type</code></strong>·-·Defines·type·conversion·and·validation·routine.·The·default·is
626 <code·class="inline">string</code>,·assuming·no·conversion.</p></li><li><p><strong><code·class="inline">nargs</code></strong>·-·Defines·the·number·of·following·arguments·to·consume·from·the626 <code·class="inline">string</code>,·assuming·no·conversion.</p></li><li><p><strong><code·class="inline">nargs</code></strong>·-·Defines·the·number·of·following·arguments·to·consume·from·the
627 command·line.·By·default,·the·parser·consumes·the·next·argument·and·converts627 command·line.·By·default,·the·parser·consumes·the·next·argument·and·converts
628 it·into·an·Erlang·term·according·to·the·specified·type.</p><ul><li><p><strong><a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pos_integer/0"><code·class="inline">pos_integer/0</code></a></strong>·-·Consume·exactly·this·number·of·positional·arguments,628 it·into·an·Erlang·term·according·to·the·specified·type.</p><ul><li><p><strong><a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:pos_integer/0"><code·class="inline">pos_integer/0</code></a></strong>·-·Consume·exactly·this·number·of·positional·arguments,
629 fail·if·there·is·not·enough.·Value·in·the·argument·map·contains·a·list·of629 fail·if·there·is·not·enough.·Value·in·the·argument·map·contains·a·list·of
630 exactly·this·length.·Example,·defining·a·positional·argument·expecting·3630 exactly·this·length.·Example,·defining·a·positional·argument·expecting·3
631 integer·values:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Cmd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1903667036-1">#{</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1903667036-2">[</span><span·class="p"·data-group-id="1903667036-3">#{</span><span·class="ss">n[·...·truncated·by·diffoscope;·len:·622,·SHA:·0baf27083afe3dc3e44b9d8d59207a880a11dec93e8ce5214304fbe30eeaaf43·...·]-1">}</span><span·class="p">,</span><span·class="w">631 integer·values:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Cmd</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1761198243-1">#{</span><span·class="ss">arguments</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1761198243-2">[</span><span·class="p"·data-group-id="1761198243-3">#{</span><span·class="ss">n[·...·truncated·by·diffoscope;·len:·622,·SHA:·8f26c378da790aa79b4a4337f37afc470c8fbc4a0840d646d379db42f8cb7a00·...·]-1">}</span><span·class="p">,</span><span·class="w">
632 </span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="1903667036-4">(</span><span·class="p"·data-group-id="1903667036-5">[</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s[·...·truncated·by·diffoscope;·len:·190,·SHA:·e6eaeb29b52610f15424c99bea0d87d7f350a4a40f46c181c0f2b0df020690d1·...·]-4">)</span><span·class="p">.</span><span·class="w">632 </span><span·class="nc">argparse</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="1761198243-4">(</span><span·class="p"·data-group-id="1761198243-5">[</span><span·class="s">&quot;1&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;2&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s[·...·truncated·by·diffoscope;·len:·190,·SHA:·cbf2c793292934bcf477f7ce67d0292b402d4efd63d09cb308d65097f70bc11f·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
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132 is·used·for·entries·that·have·not·been·explicitly·set.</p><p>Arrays·uses·<em>zero</em>-based·indexing.·This·is·a·deliberate·design·choice·and132 is·used·for·entries·that·have·not·been·explicitly·set.</p><p>Arrays·uses·<em>zero</em>-based·indexing.·This·is·a·deliberate·design·choice·and
133 differs·from·other·Erlang·data·structures,·for·example,·tuples.</p><p>Unless·specified·by·the·user·when·the·array·is·created,·the·default·value·is·the133 differs·from·other·Erlang·data·structures,·for·example,·tuples.</p><p>Unless·specified·by·the·user·when·the·array·is·created,·the·default·value·is·the
134 atom·<code·class="inline">undefined</code>.·There·is·no·difference·between·an·unset·entry·and·an·entry134 atom·<code·class="inline">undefined</code>.·There·is·no·difference·between·an·unset·entry·and·an·entry
135 that·has·been·explicitly·set·to·the·same·value·as·the·default·one·(compare135 that·has·been·explicitly·set·to·the·same·value·as·the·default·one·(compare
136 <a·href="#reset/2"><code·class="inline">reset/2</code></a>).·If·you·need·to·differentiate·between·unset·and·set·entries,·ensure136 <a·href="#reset/2"><code·class="inline">reset/2</code></a>).·If·you·need·to·differentiate·between·unset·and·set·entries,·ensure
137 that·the·default·value·cannot·be·confused·with·the·values·of·set·entries.</p><p>The·array·never·shrinks·automatically.·If·an·index·<code·class="inline">I</code>·has·been·used·to·set·an137 that·the·default·value·cannot·be·confused·with·the·values·of·set·entries.</p><p>The·array·never·shrinks·automatically.·If·an·index·<code·class="inline">I</code>·has·been·used·to·set·an
138 entry·successfully,·all·indices·in·the·range·<code·class="inline">[0,I]</code>·stay·accessible·unless·the138 entry·successfully,·all·indices·in·the·range·<code·class="inline">[0,I]</code>·stay·accessible·unless·the
139 array·size·is·explicitly·changed·by·calling·<a·href="#resize/2"><code·class="inline">resize/2</code></a>.</p><p><em>Examples:</em></p><p>Create·a·fixed-size·array·with·entries·0-9·set·to·<code·class="inline">undefined</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="0957650797-1">(</span><span·class="mi">10</span><span·class="p"·data-group-id="0957650797-1">)</span><span·class="p">.</span><span·class="w">139 array·size·is·explicitly·changed·by·calling·<a·href="#resize/2"><code·class="inline">resize/2</code></a>.</p><p><em>Examples:</em></p><p>Create·a·fixed-size·array·with·entries·0-9·set·to·<code·class="inline">undefined</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="6321986754-1">(</span><span·class="mi">10</span><span·class="p"·data-group-id="6321986754-1">)</span><span·class="p">.</span><span·class="w">
140 </span><span·class="mi">10</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">size</span><span·class="p"·data-group-id="0957650797-2">(</span><span·class="n">A0</span><span·class="p"·data-group-id="0957650797-2">)</span><span·class="p">.</span></code></pre><p>Create·an·extendible·array·and·set·entry·17·to·<code·class="inline">true</code>,·causing·the·array·to·grow140 </span><span·class="mi">10</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">size</span><span·class="p"·data-group-id="6321986754-2">(</span><span·class="n">A0</span><span·class="p"·data-group-id="6321986754-2">)</span><span·class="p">.</span></code></pre><p>Create·an·extendible·array·and·set·entry·17·to·<code·class="inline">true</code>,·causing·the·array·to·grow
141 automatically:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">set</span><span·class="p"·data-group-id="0120317277-1">(</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·46eec7d2c7892dde3fc68663b4a4b8a870749132d393098974fcd8327bf005f7·...·]7-1">)</span><span·class="p">.</span><span·class="w">141 automatically:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">set</span><span·class="p"·data-group-id="5830726827-1">(</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·9f5aa2f20dc854765237e063b7bf07bf39987b7f8eb9f19c2ad958c6a189a025·...·]7-1">)</span><span·class="p">.</span><span·class="w">
142 </span><span·class="mi">18</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">size</span><span·class="p"·data-group-id="0120317277-3">(</span><span·class="n">A1</span><span·class="p"·data-group-id="0120317277-3">)</span><span·class="p">.</span></code></pre><p>Read·back·a·stored·value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">true</span><span·class[·...·truncated·by·diffoscope;·len:·862,·SHA:·476d0d684b145d87fe939f67db3a08bc3dcb74223a3337b9ead3eb33c4b1c907·...·]-1">)</span></code></pre><p>Accessing·an·entry·beyond·the·last·set·entry·also·returns·the·default·value,·if142 </span><span·class="mi">18</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">size</span><span·class="p"·data-group-id="5830726827-3">(</span><span·class="n">A1</span><span·class="p"·data-group-id="5830726827-3">)</span><span·class="p">.</span></code></pre><p>Read·back·a·stored·value:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">true</span><span·class[·...·truncated·by·diffoscope;·len:·862,·SHA:·ba19aa60de5c75e8a00239aa8dc110850e47bb444dde89baeb650f784a2f1de1·...·]-1">)</span></code></pre><p>Accessing·an·entry·beyond·the·last·set·entry·also·returns·the·default·value,·if
143 the·array·does·not·have·fixed·size:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">undefined</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="6074994130-1">(</span><span·class="mi">18</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A1</span><span·class="p"·data-group-id="6074994130-1">)</span><span·class="p">.</span></code></pre><p>&quot;Sparse&quot;·functions·ignore·defaul[·...·truncated·by·diffoscope;·len:·515,·SHA:·1c33afb3687c0ea9dc2fd124096776606e9f29c0e806483daa23d2f95c2599f2·...·]-1">)</span><span·class="p">.</span><span·class="w">143 the·array·does·not·have·fixed·size:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">undefined</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="7702678058-1">(</span><span·class="mi">18</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A1</span><span·class="p"·data-group-id="7702678058-1">)</span><span·class="p">.</span></code></pre><p>&quot;Sparse&quot;·functions·ignore·defaul[·...·truncated·by·diffoscope;·len:·515,·SHA:·c2944d4767358b2447bb857c5d26d2e8508723ab7f4ceef663d2e878b3949730·...·]-1">)</span><span·class="p">.</span><span·class="w">
144 </span><span·class="p"·data-group-id="6217549136-2">[</span><span·class="p"·data-group-id="6217549136-3">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6217549136-3">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6217549136-4">{</span><span·class="mi">17</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6217549136-4">}</span><span·class="p"·data-group-id="6217549136-2">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">sparse_to_orddict</span><span·class="p"·data-group-id="6217549136-5">(</span><span·class="n">A2</span><span·class="p"·data-group-id="6217549136-5">)</span><span·class="p">.</span></code></pre><p>An·extendible·array·can·be·made·fixed-size·later:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">A3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">fix</span><span·class="p"·data-group-id="1689841868-1">(</span><span·class="n">A2</span><span·class="p"·data-group-id="1689841868-1">)</span><span·class="p">.</span></code></pre><p>A·fixed-size·array·does·not·grow·automatically·and·does·not·allow·accesses 
145 beyond·the·last·set·entry:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2247690105-1">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2247690105-2">{</span><span·clas[·...·truncated·by·diffoscope;·len:·805,·SHA:·e798df14385e2cb62f7f13bd5f7aaee9278e7d67c5a79e6e0598a5149f900443·...·]144 </span><span·class="p"·data-group-id="9153196360-2">[</span><span·class="p"·data-group-id="9153196360-3">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="9153196360[·...·truncated·by·diffoscope;·len:·1181,·SHA:·fbd9ac633393dbe348e6dab93e988d11d1d5e623abbca862ea433dc8bde24568·...·]
 145 beyond·the·last·set·entry:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3547370736-1">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3547370736-2">{</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="3547370736-2">}</span><span·class="p"·data-group-id="3547370736-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3547370736-3">(</span><span·class="k">catch</span><span·class="w">·</span><span·class="nc">array</span><span·class="p">:</span><span·class="nf">set</span><span·class="p"·data-group-id="3547370736-4">(</span><span·class="mi">18</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A3</span><span·class="p"·data-group-id="3547370736-4">)</span><span·class="p"·data-group-id="3547370736-3">)</span><span·class="p">.</span><span·class="w">
146 </span><span·class="p"·data-group-id="2247690105-5">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="2247690105-6">{</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="2247690105[·...·truncated·by·diffoscope;·len:·568,·SHA:·e8e26480b451c01f788625b279f953f4ba9585b92c710e1ec7a1814941ab5ac3·...·]-7">)</span><span·class="p">.</span></code></pre>146 </span><span·class="p"·data-group-id="3547370736-5">{</span><span·class="ss">&#39;EXIT&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="3547370736-6">{</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="3547370736[·...·truncated·by·diffoscope;·len:·568,·SHA:·1664d9d27a756747dd44266f2155362913e09d9aaecb80dc549031f6ddae633b·...·]-7">)</span><span·class="p">.</span></code></pre>
147 ····</section>147 ····</section>
  
148 </div>148 </div>
  
149 ··<section·id="summary"·class="details-list">149 ··<section·id="summary"·class="details-list">
150 ····<h1·class="section-heading">150 ····<h1·class="section-heading">
151 ······<a·class="hover-link"·href="#summary">151 ······<a·class="hover-link"·href="#summary">
Offset 1138, 15 lines modifiedOffset 1138, 15 lines modified
1138 ······</div>1138 ······</div>
  
1139 <p>Creates·a·new·array·according·to·the·specified·options.·By·default,·the·array·is1139 <p>Creates·a·new·array·according·to·the·specified·options.·By·default,·the·array·is
1140 extendible·and·has·initial·size·zero.·Array·indices·start·at·<code·class="inline">0</code>.</p><p><code·class="inline">Options</code>·is·a·single·term·or·a·list·of·terms,·selected·from·the·following:</p><ul><li><p><strong><code·class="inline">N::integer()·&gt;=·0</code>·or·<code·class="inline">{size,·N::integer()·&gt;=·0}</code></strong>·-·Specifies·the·initial1140 extendible·and·has·initial·size·zero.·Array·indices·start·at·<code·class="inline">0</code>.</p><p><code·class="inline">Options</code>·is·a·single·term·or·a·list·of·terms,·selected·from·the·following:</p><ul><li><p><strong><code·class="inline">N::integer()·&gt;=·0</code>·or·<code·class="inline">{size,·N::integer()·&gt;=·0}</code></strong>·-·Specifies·the·initial
1141 array·size;·this·also·implies·<code·class="inline">{fixed,·true}</code>.·If·<code·class="inline">N</code>·is·not·a·non-negative1141 array·size;·this·also·implies·<code·class="inline">{fixed,·true}</code>.·If·<code·class="inline">N</code>·is·not·a·non-negative
1142 integer,·the·call·fails·with·reason·<code·class="inline">badarg</code>.</p></li><li><p><strong><code·class="inline">fixed</code>·or·<code·class="inline">{fixed,·true}</code></strong>·-·Creates·a·fixed-size·array.·See·also·<a·href="#fix/1"><code·class="inline">fix/1</code></a>.</p></li><li><p><strong><code·class="inline">{fixed,·false}</code></strong>·-·Creates·an·extendible·(non-fixed-size)·array.</p></li><li><p><strong><code·class="inline">{default,·Value}</code></strong>·-·Sets·the·default·value·for·the·array·to·<code·class="inline">Value</code>.</p></li></ul><p>Options·are·processed·in·the·order·they·occur·in·the·list,·that·is,·later1142 integer,·the·call·fails·with·reason·<code·class="inline">badarg</code>.</p></li><li><p><strong><code·class="inline">fixed</code>·or·<code·class="inline">{fixed,·true}</code></strong>·-·Creates·a·fixed-size·array.·See·also·<a·href="#fix/1"><code·class="inline">fix/1</code></a>.</p></li><li><p><strong><code·class="inline">{fixed,·false}</code></strong>·-·Creates·an·extendible·(non-fixed-size)·array.</p></li><li><p><strong><code·class="inline">{default,·Value}</code></strong>·-·Sets·the·default·value·for·the·array·to·<code·class="inline">Value</code>.</p></li></ul><p>Options·are·processed·in·the·order·they·occur·in·the·list,·that·is,·later
1143 options·have·higher·precedence.</p><p>The·default·value·is·used·as·the·value·of·uninitialized·entries,·and·cannot·be1143 options·have·higher·precedence.</p><p>The·default·value·is·used·as·the·value·of·uninitialized·entries,·and·cannot·be
1144 changed·once·the·array·has·been·created.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="4736535538-1">(</span><span·class="mi">100</span><span·class="p"·data-group-id="4736535538-1">)</span></code></pre><p>creates·a·fixed-size·array·of·size·100.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">array</span><span·class="p">:</[·...·truncated·by·diffoscope;·len:·1390,·SHA:·aa2ad494d25ace0607191bd35ce1b5bbb52791e9318918e7df98430f52927625·...·]-1">)</span></code></pre><p>creates·an·extendible·array·with·initial·size·10·whose·default·value·is·<code·class="inline">-1</code>.</p><p>See·also·<a·href="#fix/1"><code·class="inline">fix/1</code></a>,·<a·href="#from_list/2"><code·class="inline">from_list/2</code></a>,·<a·href="#get/2"><code·class="inline">get/2</code></a>,·<a·href="#new/0"><code·class="inline">new/0</code></a>,·<a·href="#new/2"><code·class="inline">new/2</code></a>,·<a·href="#set/3"><code·class="inline">set/3</code></a>.</p>1144 changed·once·the·array·has·been·created.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="4999723793-1">(</span><span·class="mi">100</span><span·class="p"·data-group-id="4999723793-1">)</span></code></pre><p>creates·a·fixed-size·array·of·size·100.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">array</span><span·class="p">:</[·...·truncated·by·diffoscope;·len:·1390,·SHA:·26a4d15c63c0710671366cbf58001f46d5dbab10f375480d3d1182f45d8d3ad3·...·]-1">)</span></code></pre><p>creates·an·extendible·array·with·initial·size·10·whose·default·value·is·<code·class="inline">-1</code>.</p><p>See·also·<a·href="#fix/1"><code·class="inline">fix/1</code></a>,·<a·href="#from_list/2"><code·class="inline">from_list/2</code></a>,·<a·href="#get/2"><code·class="inline">get/2</code></a>,·<a·href="#new/0"><code·class="inline">new/0</code></a>,·<a·href="#new/2"><code·class="inline">new/2</code></a>,·<a·href="#set/3"><code·class="inline">set/3</code></a>.</p>
1145 ··</section>1145 ··</section>
1146 </section>1146 </section>
1147 <section·class="detail"·id="new/2">1147 <section·class="detail"·id="new/2">
  
1148 ··<div·class="detail-header">1148 ··<div·class="detail-header">
1149 ····<a·href="#new/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1149 ····<a·href="#new/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1150 ······<i·class="ri-link-m"·aria-hidden="true"></i>1150 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1169, 15 lines modifiedOffset 1169, 15 lines modified
1169 ······</div>1169 ······</div>
  
1170 <p>Creates·a·new·array·according·to·the·specified·size·and·options.</p><p>If·<code·class="inline">Size</code>·is·not·a·non-negative·integer,·the·call·fails·with·reason·<code·class="inline">badarg</code>.1170 <p>Creates·a·new·array·according·to·the·specified·size·and·options.</p><p>If·<code·class="inline">Size</code>·is·not·a·non-negative·integer,·the·call·fails·with·reason·<code·class="inline">badarg</code>.
1171 By·default,·the·array·has·fixed·size.·Notice·that·any·size·specifications·in1171 By·default,·the·array·has·fixed·size.·Notice·that·any·size·specifications·in
1172 <code·class="inline">Options</code>·override·parameter·<code·class="inline">Size</code>.</p><p>If·<code·class="inline">Options</code>·is·a·list,·this·is·equivalent·to1172 <code·class="inline">Options</code>·override·parameter·<code·class="inline">Size</code>.</p><p>If·<code·class="inline">Options</code>·is·a·list,·this·is·equivalent·to
1173 <a·href="#new/1"><code·class="inline">new([{size,·Size}·|·Options])</code></a>,·otherwise·it·is·equivalent·to1173 <a·href="#new/1"><code·class="inline">new([{size,·Size}·|·Options])</code></a>,·otherwise·it·is·equivalent·to
1174 <a·href="#new/1"><code·class="inline">new([{size,·Size}·|·[Options]])</code></a>.·However,·using·this·function1174 <a·href="#new/1"><code·class="inline">new([{size,·Size}·|·[Options]])</code></a>.·However,·using·this·function
1175 directly·is·more·efficient.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="0246679326-1">(</span><span·class="mi">100</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0246679326-2">{</span><span·class="ss">default</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·68,·SHA:·d6a06336f56a0d6a5377b961a33ffe314d4c392e56bf18656844f7f7c9363f85·...·]-1">)</span></code></pre><p>creates·a·fixed-size·array·of·size·100,·whose·default·value·is·<code·class="inline">0</code>.</p><p>See·also·<a·href="#new/1"><code·class="inline">new/1</code></a>.</p>1175 directly·is·more·efficient.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">array</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="6482232369-1">(</span><span·class="mi">100</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6482232369-2">{</span><span·class="ss">default</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·68,·SHA:·cf29283ecd2973d42db064795c85211a3c58ab92b5c3428bfbf4445625282361·...·]-1">)</span></code></pre><p>creates·a·fixed-size·array·of·size·100,·whose·default·value·is·<code·class="inline">0</code>.</p><p>See·also·<a·href="#new/1"><code·class="inline">new/1</code></a>.</p>
1176 ··</section>1176 ··</section>
1177 </section>1177 </section>
1178 <section·class="detail"·id="relax/1">1178 <section·class="detail"·id="relax/1">
  
1179 ··<div·class="detail-header">1179 ··<div·class="detail-header">
1180 ····<a·href="#relax/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1180 ····<a·href="#relax/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1181 ······<i·class="ri-link-m"·aria-hidden="true"></i>1181 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1585 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1585 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1586 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1586 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1587 ······</p>1587 ······</p>
1588 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1588 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1589 ····</footer>1589 ····</footer>
1590 ··</div>1590 ··</div>
1591 </main>1591 </main>
1592 </div>1592 </div>
1593 <script>1593 <script>
1594 ··function·mermaidLoaded()·{1594 ··function·mermaidLoaded()·{
1595 ····mermaid.initialize({1595 ····mermaid.initialize({
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128 <p>Assert·macros.</p><h2·id="description"·class="section-heading">128 <p>Assert·macros.</p><h2·id="description"·class="section-heading">
129 ··<a·href="#description"·class="hover-link">129 ··<a·href="#description"·class="hover-link">
130 ····<i·class="ri-link-m"·aria-hidden="true"></i>130 ····<i·class="ri-link-m"·aria-hidden="true"></i>
131 ··</a>131 ··</a>
132 ··<span·class="text">Description</span>132 ··<span·class="text">Description</span>
133 </h2>133 </h2>
134 <p>The·include·file·<code·class="inline">assert.hrl</code>·provides·macros·for·inserting·assertions·in·your134 <p>The·include·file·<code·class="inline">assert.hrl</code>·provides·macros·for·inserting·assertions·in·your
135 program·code.</p><p>Include·the·following·directive·in·the·module·from·which·the·function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="1619001860-1">(</span><span·class="s">&quot;stdlib/include/assert.hrl&quot;</span><span·class="p"·data-group-id="1619001860-1">)</span><span·class="p">.</span></code></pre><p>When·an·assertion·succeeds,·the·assert·macro·yields·the·atom·<code·class="inline">ok</code>.·When·an135 program·code.</p><p>Include·the·following·directive·in·the·module·from·which·the·function·is·called:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="4770604232-1">(</span><span·class="s">&quot;stdlib/include/assert.hrl&quot;</span><span·class="p"·data-group-id="4770604232-1">)</span><span·class="p">.</span></code></pre><p>When·an·assertion·succeeds,·the·assert·macro·yields·the·atom·<code·class="inline">ok</code>.·When·an
136 assertion·fails,·an·exception·of·type·<code·class="inline">error</code>·is·generated.·The·associated·error136 assertion·fails,·an·exception·of·type·<code·class="inline">error</code>·is·generated.·The·associated·error
137 term·has·the·form·<code·class="inline">{Macro,·Info}</code>.·<code·class="inline">Macro</code>·is·the·macro·name,·for·example,137 term·has·the·form·<code·class="inline">{Macro,·Info}</code>.·<code·class="inline">Macro</code>·is·the·macro·name,·for·example,
138 <code·class="inline">assertEqual</code>.·<code·class="inline">Info</code>·is·a·list·of·tagged·values,·such·as138 <code·class="inline">assertEqual</code>.·<code·class="inline">Info</code>·is·a·list·of·tagged·values,·such·as
139 <code·class="inline">[{module,·M},·{line,·L},·...]</code>,·which·gives·more·information·about·the·location139 <code·class="inline">[{module,·M},·{line,·L},·...]</code>,·which·gives·more·information·about·the·location
140 and·cause·of·the·exception.·All·entries·in·the·<code·class="inline">Info</code>·list·are·optional;·do·not140 and·cause·of·the·exception.·All·entries·in·the·<code·class="inline">Info</code>·list·are·optional;·do·not
141 rely·programmatically·on·any·of·them·being·present.</p><p>Each·assert·macro·has·a·corresponding·version·with·an·extra·argument,·for·adding141 rely·programmatically·on·any·of·them·being·present.</p><p>Each·assert·macro·has·a·corresponding·version·with·an·extra·argument,·for·adding
142 comments·to·assertions.·These·can·for·example·be·printed·as·part·of·error142 comments·to·assertions.·These·can·for·example·be·printed·as·part·of·error
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156 ····<i·class="ri-link-m"·aria-hidden="true"></i>156 ····<i·class="ri-link-m"·aria-hidden="true"></i>
157 ··</a>157 ··</a>
158 ··<span·class="text">Macros</span>158 ··<span·class="text">Macros</span>
159 </h2>159 </h2>
160 <ul><li><p><strong><code·class="inline">assert(BoolExpr)</code></strong></p></li><li><p><strong><code·class="inline">assert(BoolExpr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">BoolExpr</code>·completes·normally160 <ul><li><p><strong><code·class="inline">assert(BoolExpr)</code></strong></p></li><li><p><strong><code·class="inline">assert(BoolExpr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">BoolExpr</code>·completes·normally
161 returning·<code·class="inline">true</code>.</p></li><li><p><strong><code·class="inline">assertNot(BoolExpr)</code></strong></p></li><li><p><strong><code·class="inline">assertNot(BoolExpr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">BoolExpr</code>·completes·normally161 returning·<code·class="inline">true</code>.</p></li><li><p><strong><code·class="inline">assertNot(BoolExpr)</code></strong></p></li><li><p><strong><code·class="inline">assertNot(BoolExpr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">BoolExpr</code>·completes·normally
162 returning·<code·class="inline">false</code>.</p></li><li><p><strong><code·class="inline">assertMatch(GuardedPattern,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertMatch(GuardedPattern,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>·completes162 returning·<code·class="inline">false</code>.</p></li><li><p><strong><code·class="inline">assertMatch(GuardedPattern,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertMatch(GuardedPattern,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>·completes
163 normally·yielding·a·value·that·matches·<code·class="inline">GuardedPattern</code>,·for·example:</p><pre><code·class="text">?assertMatch({bork,·_},·f())</code></pre><p>Notice·that·a·guard·<code·class="inline">when·...</code>·can·be·included:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="nf">assertMatch</span><span·class="p"·data-group-id="3177008763-1">(</span><span·class="p"·data-group-id="3177008763-2">{</span><span·class="ss">bork</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="3177008763-2">}</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·391,·SHA:·43f3e5ad77097ce95a7f7426881979c4439cedf468ba0620881fb1dc9750b10f·...·]-1">)</span></code></pre></li><li><p><strong><code·class="inline">assertNotMatch(GuardedPattern,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertNotMatch(GuardedPattern,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>163 normally·yielding·a·value·that·matches·<code·class="inline">GuardedPattern</code>,·for·example:</p><pre><code·class="text">?assertMatch({bork,·_},·f())</code></pre><p>Notice·that·a·guard·<code·class="inline">when·...</code>·can·be·included:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="nf">assertMatch</span><span·class="p"·data-group-id="2086634524-1">(</span><span·class="p"·data-group-id="2086634524-2">{</span><span·class="ss">bork</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p"·data-group-id="2086634524-2">}</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·391,·SHA:·5715880881a7abcc5143a41978331c45b124b8391b8a4278cb02e635d8e8e8e4·...·]-1">)</span></code></pre></li><li><p><strong><code·class="inline">assertNotMatch(GuardedPattern,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertNotMatch(GuardedPattern,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>
164 completes·normally·yielding·a·value·that·does·not·match·<code·class="inline">GuardedPattern</code>.</p><p>As·in·<code·class="inline">assertMatch</code>,·<code·class="inline">GuardedPattern</code>·can·have·a·<code·class="inline">when</code>·part.</p></li><li><p><strong><code·class="inline">assertEqual(ExpectedValue,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertEqual(ExpectedValue,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>·completes164 completes·normally·yielding·a·value·that·does·not·match·<code·class="inline">GuardedPattern</code>.</p><p>As·in·<code·class="inline">assertMatch</code>,·<code·class="inline">GuardedPattern</code>·can·have·a·<code·class="inline">when</code>·part.</p></li><li><p><strong><code·class="inline">assertEqual(ExpectedValue,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertEqual(ExpectedValue,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>·completes
165 normally·yielding·a·value·that·is·exactly·equal·to·<code·class="inline">ExpectedValue</code>.</p></li><li><p><strong><code·class="inline">assertNotEqual(ExpectedValue,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertNotEqual(ExpectedValue,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>165 normally·yielding·a·value·that·is·exactly·equal·to·<code·class="inline">ExpectedValue</code>.</p></li><li><p><strong><code·class="inline">assertNotEqual(ExpectedValue,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertNotEqual(ExpectedValue,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>
166 completes·normally·yielding·a·value·that·is·not·exactly·equal·to166 completes·normally·yielding·a·value·that·is·not·exactly·equal·to
167 <code·class="inline">ExpectedValue</code>.</p></li><li><p><strong><code·class="inline">assertException(Class,·Term,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertException(Class,·Term,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>167 <code·class="inline">ExpectedValue</code>.</p></li><li><p><strong><code·class="inline">assertException(Class,·Term,·Expr)</code></strong></p></li><li><p><strong><code·class="inline">assertException(Class,·Term,·Expr,·Comment)</code></strong>·-·Tests·that·<code·class="inline">Expr</code>
168 completes·abnormally·with·an·exception·of·type·<code·class="inline">Class</code>·and·with·the·associated168 completes·abnormally·with·an·exception·of·type·<code·class="inline">Class</code>·and·with·the·associated
169 <code·class="inline">Term</code>.·The·assertion·fails·if·<code·class="inline">Expr</code>·raises·a·different·exception·or·if·it169 <code·class="inline">Term</code>.·The·assertion·fails·if·<code·class="inline">Expr</code>·raises·a·different·exception·or·if·it
170 completes·normally·returning·any·value.</p><p>Notice·that·both·<code·class="inline">Class</code>·and·<code·class="inline">Term</code>·can·be·guarded·patterns,·as·in170 completes·normally·returning·any·value.</p><p>Notice·that·both·<code·class="inline">Class</code>·and·<code·class="inline">Term</code>·can·be·guarded·patterns,·as·in
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218 ······<p·class="built-using">218 ······<p·class="built-using">
219 ········Built·using219 ········Built·using
220 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the220 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
221 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>221 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
222 ······</p>222 ······</p>
223 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>223 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
224 ····</footer>224 ····</footer>
225 ··</div>225 ··</div>
226 </main>226 </main>
227 </div>227 </div>
228 <script>228 <script>
229 ··function·mermaidLoaded()·{229 ··function·mermaidLoaded()·{
230 ····mermaid.initialize({230 ····mermaid.initialize({
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649 ····················Data·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>649 ····················Data·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>
  
650 ······</div>650 ······</div>
  
651 <p>Decodes·a·base64·string·encoded·using·the·standard·alphabet·according·to651 <p>Decodes·a·base64·string·encoded·using·the·standard·alphabet·according·to
652 <a·href="https://datatracker.ietf.org/doc/html/rfc4648#section-4">RFC·4648·Section·4</a>·to652 <a·href="https://datatracker.ietf.org/doc/html/rfc4648#section-4">RFC·4648·Section·4</a>·to
653 plain·ASCII.</p><p>The·function·will·strips·away·any·whitespace·characters·and·check·for·the653 plain·ASCII.</p><p>The·function·will·strips·away·any·whitespace·characters·and·check·for·the
654 the·correct·number·of·<code·class="inline">=</code>·padding·characters·at·the·end·of·the·encoded·string.</p><p>See·<a·href="#t:decode_options/0"><code·class="inline">decode_options/0</code></a>·for·details·on·which·options·can·be·passed.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="5249460161-1">(</span><span·class="s">&quot;AQIDBA==&quot;</span><span·class="p"·data-group-id="5249460161-1">)</span><span·class="p">.</span><span·class="w">654 the·correct·number·of·<code·class="inline">=</code>·padding·characters·at·the·end·of·the·encoded·string.</p><p>See·<a·href="#t:decode_options/0"><code·class="inline">decode_options/0</code></a>·for·details·on·which·options·can·be·passed.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="1001939408-1">(</span><span·class="s">&quot;AQIDBA==&quot;</span><span·class="p"·data-group-id="1001939408-1">)</span><span·class="p">.</span><span·class="w">
655 </span><span·class="p"·data-group-id="5249460161-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5249460161-2">&gt;&gt;</span><span·class="gp·unselectable">655 </span><span·class="p"·data-group-id="1001939408-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="1001939408-2">&gt;&gt;</span><span·class="gp·unselectable">
656 2&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="5249460161-3">(</span><span·class="s">&quot;AQ·ID·BA==&quot;</span><span·class="p"·data-group-id="5249460161-3">)</span><span·class="p">.</span><span·class="w">656 2&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="1001939408-3">(</span><span·class="s">&quot;AQ·ID·BA==&quot;</span><span·class="p"·data-group-id="1001939408-3">)</span><span·class="p">.</span><span·class="w">
657 </span><span·class="p"·data-group-id="5249460161-4">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5249460161-4">&gt;&gt;</span><span·class="gp·unselectable">657 </span><span·class="p"·data-group-id="1001939408-4">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="1001939408-4">&gt;&gt;</span><span·class="gp·unselectable">
658 3&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="5249460161-5">(</span><span·class="s">&quot;AQIDBA=&quot;</span><span·class="p"·data-group-id="5249460161-5">)</span><span·class="p">.</span><span·class="w">658 3&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="1001939408-5">(</span><span·class="s">&quot;AQIDBA=&quot;</span><span·class="p"·data-group-id="1001939408-5">)</span><span·class="p">.</span><span·class="w">
659 </span><span·class="gt">**·exception·error:·missing_padding659 </span><span·class="gt">**·exception·error:·missing_padding
660 ·····in·function··base64:decode_list/7·(base64.erl,·line·734)660 ·····in·function··base64:decode_list/7·(base64.erl,·line·734)
661 ········***·data·to·decode·is·missing·final·=·padding·characters,·if·this·is·intended,·use·the·`padding·=&gt;·false`·option</span><span·class="gp·unselectable">661 ········***·data·to·decode·is·missing·final·=·padding·characters,·if·this·is·intended,·use·the·`padding·=&gt;·false`·option</span><span·class="gp·unselectable">
662 4&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="5249460161-6">(</span><span·class="s">&quot;AQIDBA=&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5249460161-7">#{</span><span·class="w">·</span><span·class="ss">padding</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·188,·SHA:·91cf4dd6d84aa9824fe7e82543489b670609bf71657851635e7a4f6c954ab3d1·...·]-6">)</span><span·class="p">.</span><span·class="w">662 4&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="1001939408-6">(</span><span·class="s">&quot;AQIDBA=&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1001939408-7">#{</span><span·class="w">·</span><span·class="ss">padding</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·188,·SHA:·43fcb53e548d351fdf5180becf169fe84a1c6d5a3162f9bc505e3ad750a1ad90·...·]-6">)</span><span·class="p">.</span><span·class="w">
663 </span><span·class="p"·data-group-id="5249460161-8">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5249460161-8">&gt;&gt;</span></code></pre>663 </span><span·class="p"·data-group-id="1001939408-8">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="1001939408-8">&gt;&gt;</span></code></pre>
664 ··</section>664 ··</section>
665 </section>665 </section>
666 <section·class="detail"·id="decode_to_string/1">666 <section·class="detail"·id="decode_to_string/1">
  
667 ··<div·class="detail-header">667 ··<div·class="detail-header">
668 ····<a·href="#decode_to_string/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">668 ····<a·href="#decode_to_string/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
669 ······<i·class="ri-link-m"·aria-hidden="true"></i>669 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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896 ·························Data·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>896 ·························Data·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>
  
897 ······</div>897 ······</div>
  
898 <p>Decodes·a·base64·&quot;mime&quot;·string·encoded·using·the·standard·alphabet·according·to898 <p>Decodes·a·base64·&quot;mime&quot;·string·encoded·using·the·standard·alphabet·according·to
899 <a·href="https://datatracker.ietf.org/doc/html/rfc4648#section-4">RFC·4648·Section·4</a>·to899 <a·href="https://datatracker.ietf.org/doc/html/rfc4648#section-4">RFC·4648·Section·4</a>·to
900 plain·ASCII.</p><p>The·function·will·strips·away·any·illegal·characters.·It·does·<em>not</em>·check·for·the900 plain·ASCII.</p><p>The·function·will·strips·away·any·illegal·characters.·It·does·<em>not</em>·check·for·the
901 the·correct·number·of·<code·class="inline">=</code>·padding·characters·at·the·end·of·the·encoded·string.</p><p>See·<a·href="#t:decode_options/0"><code·class="inline">decode_options/0</code></a>·for·details·on·which·options·can·be·passed.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">mime_decode</span><span·class="p"·data-group-id="9037808223-1">(</span><span·class="s">&quot;AQIDBA==&quot;</span><span·class="p"·data-group-id="9037808223-1">)</span><span·class="p">.</span><span·class="w">901 the·correct·number·of·<code·class="inline">=</code>·padding·characters·at·the·end·of·the·encoded·string.</p><p>See·<a·href="#t:decode_options/0"><code·class="inline">decode_options/0</code></a>·for·details·on·which·options·can·be·passed.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">mime_decode</span><span·class="p"·data-group-id="5633033287-1">(</span><span·class="s">&quot;AQIDBA==&quot;</span><span·class="p"·data-group-id="5633033287-1">)</span><span·class="p">.</span><span·class="w">
902 </span><span·class="p"·data-group-id="9037808223-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="9037808223-2">&gt;&gt;</span><span·class="gp·unselectable">902 </span><span·class="p"·data-group-id="5633033287-2">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5633033287-2">&gt;&gt;</span><span·class="gp·unselectable">
903 2&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">mime_decode</span><span·class="p"·data-group-id="9037808223-3">(</span><span·class="s">&quot;AQIDB=A=&quot;</span><span·class="p"·data-group-id="9037808223-3">)</span><span·class="p">.</span><span·class="w">903 2&gt;·</span><span·class="nc">base64</span><span·class="p">:</span><span·class="nf">mime_decode</span><span·class="p"·data-group-id="5633033287-3">(</span><span·class="s">&quot;AQIDB=A=&quot;</span><span·class="p"·data-group-id="5633033287-3">)</span><span·class="p">.</span><span·class="w">
904 </span><span·class="p"·data-group-id="9037808223-4">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="9037808223-4">&gt;&gt;</span></code></pre>904 </span><span·class="p"·data-group-id="5633033287-4">&lt;&lt;</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5633033287-4">&gt;&gt;</span></code></pre>
905 ··</section>905 ··</section>
906 </section>906 </section>
907 <section·class="detail"·id="mime_decode_to_string/1">907 <section·class="detail"·id="mime_decode_to_string/1">
  
908 ··<div·class="detail-header">908 ··<div·class="detail-header">
909 ····<a·href="#mime_decode_to_string/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">909 ····<a·href="#mime_decode_to_string/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
910 ······<i·class="ri-link-m"·aria-hidden="true"></i>910 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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991 ······<p·class="built-using">991 ······<p·class="built-using">
992 ········Built·using992 ········Built·using
993 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the993 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
994 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>994 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
995 ······</p>995 ······</p>
996 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>996 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
997 ····</footer>997 ····</footer>
998 ··</div>998 ··</div>
999 </main>999 </main>
1000 </div>1000 </div>
1001 <script>1001 <script>
1002 ··function·mermaidLoaded()·{1002 ··function·mermaidLoaded()·{
1003 ····mermaid.initialize({1003 ····mermaid.initialize({
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147 <a·href="#strip_files/1"><code·class="inline">strip_files/1</code></a>,·and/or·<a·href="#strip_release/1"><code·class="inline">strip_release/1</code></a>.</p><h2·id="module-reconstruct-source-code"·class="section-heading">147 <a·href="#strip_files/1"><code·class="inline">strip_files/1</code></a>,·and/or·<a·href="#strip_release/1"><code·class="inline">strip_release/1</code></a>.</p><h2·id="module-reconstruct-source-code"·class="section-heading">
148 ··<a·href="#module-reconstruct-source-code"·class="hover-link">148 ··<a·href="#module-reconstruct-source-code"·class="hover-link">
149 ····<i·class="ri-link-m"·aria-hidden="true"></i>149 ····<i·class="ri-link-m"·aria-hidden="true"></i>
150 ··</a>150 ··</a>
151 ··<span·class="text">Reconstruct·Source·Code</span>151 ··<span·class="text">Reconstruct·Source·Code</span>
152 </h2>152 </h2>
153 <p>The·following·example·shows·how·to·reconstruct·Erlang·source·code·from·the·debug153 <p>The·following·example·shows·how·to·reconstruct·Erlang·source·code·from·the·debug
154 information·in·a·BEAM·file·<code·class="inline">Beam</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2119499139-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2119499139-2">{</span><span·class="p">_</span><span·class="p">,</span><span·class="p"·data-group-id="2119499139-3">[</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·921,·SHA:·5b1abcf66619ac1f5c5f8c04ba21011babba5a2ef476dd5e4b0a5ef2e1d052e0·...·]-6">)</span><span·class="p">.</span><span·class="w">154 information·in·a·BEAM·file·<code·class="inline">Beam</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3619639531-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3619639531-2">{</span><span·class="p">_</span><span·class="p">,</span><span·class="p"·data-group-id="3619639531-3">[</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·921,·SHA:·054551acf3e24afa3590d59952e314b06c8745b50d33c303719c9b5bbc9eceec·...·]-6">)</span><span·class="p">.</span><span·class="w">
155 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="2119499139-8">(</span><span·class="s">&quot;</span><span·class="si">~s</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2119499139-9">[</span><span·class="nc">erl_pr[·...·truncated·by·diffoscope;·len:·493,·SHA:·164cab8241b45917e27b8ea79a57f16fd277332e1acbb08ed51948ff09b2a3ca·...·]-8">)</span><span·class="p">.</span></code></pre><h2·id="module-encrypted-debug-information"·class="section-heading">155 </span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">fwrite</span><span·class="p"·data-group-id="3619639531-8">(</span><span·class="s">&quot;</span><span·class="si">~s</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3619639531-9">[</span><span·class="nc">erl_pr[·...·truncated·by·diffoscope;·len:·493,·SHA:·30d9a9f627db99a94ca225ce688c727327e71e03795b8c3817b8ac8bddb5614b·...·]-8">)</span><span·class="p">.</span></code></pre><h2·id="module-encrypted-debug-information"·class="section-heading">
156 ··<a·href="#module-encrypted-debug-information"·class="hover-link">156 ··<a·href="#module-encrypted-debug-information"·class="hover-link">
157 ····<i·class="ri-link-m"·aria-hidden="true"></i>157 ····<i·class="ri-link-m"·aria-hidden="true"></i>
158 ··</a>158 ··</a>
159 ··<span·class="text">Encrypted·Debug·Information</span>159 ··<span·class="text">Encrypted·Debug·Information</span>
160 </h2>160 </h2>
161 <p>The·debug·information·can·be·encrypted·to·keep·the·source·code·secret,·but·still161 <p>The·debug·information·can·be·encrypted·to·keep·the·source·code·secret,·but·still
162 be·able·to·use·tools·such·as·Debugger·or·Xref.</p><p>To·use·encrypted·debug·information,·a·key·must·be·provided·to·the·compiler·and162 be·able·to·use·tools·such·as·Debugger·or·Xref.</p><p>To·use·encrypted·debug·information,·a·key·must·be·provided·to·the·compiler·and
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178 ··</a>178 ··</a>
179 ··<span·class="text">.erlang.crypt</span>179 ··<span·class="text">.erlang.crypt</span>
180 </h2>180 </h2>
181 <p><code·class="inline">beam_lib</code>·searches·for·<code·class="inline">.erlang.crypt</code>·in·the·current·directory,·then·the181 <p><code·class="inline">beam_lib</code>·searches·for·<code·class="inline">.erlang.crypt</code>·in·the·current·directory,·then·the
182 <a·href="../../../../erts-15.2.6/doc/html/init.html#home">user's·home·directory</a>·and·then182 <a·href="../../../../erts-15.2.6/doc/html/init.html#home">user's·home·directory</a>·and·then
183 <a·href="filename.html#user_config"><code·class="inline">filename:basedir(user_config,·&quot;erlang&quot;)</code></a>.·If·the183 <a·href="filename.html#user_config"><code·class="inline">filename:basedir(user_config,·&quot;erlang&quot;)</code></a>.·If·the
184 file·is·found·and·contains·a·key,·<code·class="inline">beam_lib</code>·implicitly·creates·a·crypto·key·fun184 file·is·found·and·contains·a·key,·<code·class="inline">beam_lib</code>·implicitly·creates·a·crypto·key·fun
185 and·registers·it.</p><p>File·<code·class="inline">.erlang.crypt</code>·is·to·contain·a·single·list·of·tuples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0587986501-1">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·67,·SHA:·c093caa128cc830d496bd01ec2c946aedd4f4f065ab77842956db3518c487219·...·]-1">}</span></code></pre><p><code·class="inline">Mode</code>·is·the·type·of·crypto·algorithm;·currently,·the·only·allowed·value·is185 and·registers·it.</p><p>File·<code·class="inline">.erlang.crypt</code>·is·to·contain·a·single·list·of·tuples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5738105064-1">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·67,·SHA:·ea31dab50ecbb49d52a93b271a7c9c2effb5c417239a45e189c5de186ae24194·...·]-1">}</span></code></pre><p><code·class="inline">Mode</code>·is·the·type·of·crypto·algorithm;·currently,·the·only·allowed·value·is
186 <code·class="inline">des3_cbc</code>.·<code·class="inline">Module</code>·is·either·an·atom,·in·which·case·<code·class="inline">Key</code>·is·only·used·for·the186 <code·class="inline">des3_cbc</code>.·<code·class="inline">Module</code>·is·either·an·atom,·in·which·case·<code·class="inline">Key</code>·is·only·used·for·the
187 module·<code·class="inline">Module</code>,·or·<code·class="inline">[]</code>,·in·which·case·<code·class="inline">Key</code>·is·used·for·all·modules.·<code·class="inline">Key</code>·is187 module·<code·class="inline">Module</code>,·or·<code·class="inline">[]</code>,·in·which·case·<code·class="inline">Key</code>·is·used·for·all·modules.·<code·class="inline">Key</code>·is
188 the·non-empty·key·string.</p><p><code·class="inline">Key</code>·in·the·first·tuple·where·both·<code·class="inline">Mode</code>·and·<code·class="inline">Module</code>·match·is·used.</p><p>The·following·is·an·example·of·an·<code·class="inline">.erlang.crypt</code>·file·that·returns·the·same·key188 the·non-empty·key·string.</p><p><code·class="inline">Key</code>·in·the·first·tuple·where·both·<code·class="inline">Mode</code>·and·<code·class="inline">Module</code>·match·is·used.</p><p>The·following·is·an·example·of·an·<code·class="inline">.erlang.crypt</code>·file·that·returns·the·same·key
189 for·all·modules:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5045692485-1">[</span><span·class="p"·data-group-id="5045692485-2">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">des3_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·303,·SHA:·47aef4837dcca5d2789bcb876fdc091f14d6d402a012eb4e31d390dc14650402·...·]-1">]</span><span·class="p">.</span></code></pre><p>The·following·is·a·slightly·more·complicated·example·of·an·<code·class="inline">.erlang.crypt</code>189 for·all·modules:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9211697516-1">[</span><span·class="p"·data-group-id="9211697516-2">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">des3_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·303,·SHA:·1a293630741441b2f1a99725fc6dcd946b4170edbd5eba41384662c0d5f561fd·...·]-1">]</span><span·class="p">.</span></code></pre><p>The·following·is·a·slightly·more·complicated·example·of·an·<code·class="inline">.erlang.crypt</code>
190 providing·one·key·for·module·<code·class="inline">t</code>·and·another·key·for·all·other·modules:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2537631958-1">[</span><span·class="p"·data-group-id="2537631958-2">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">des3_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">t</[·...·truncated·by·diffoscope;·len:·135,·SHA:·2ba9fd4e89f099920a554afc336b92e108a13a9aec9f86a97331ce38f7d6d667·...·]-2">}</span><span·class="p">,</span><span·class="w">190 providing·one·key·for·module·<code·class="inline">t</code>·and·another·key·for·all·other·modules:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2981964397-1">[</span><span·class="p"·data-group-id="2981964397-2">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">des3_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">t</[·...·truncated·by·diffoscope;·len:·135,·SHA:·9e6c110953b2a84fc1b633646fdc2c2e11043a2d09d1aab2650fbb5a3b36fa3a·...·]-2">}</span><span·class="p">,</span><span·class="w">
191 ·</span><span·class="p"·data-group-id="2537631958-3">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">des3_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2537631958-4">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·249,·SHA:·250ac268cd306a589e091a1900aa03d974377b2d00d2881714512f149189e9a6·...·]-1">]</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Do·not·use·any·of·the·keys·in·these·examples.·Use·your·own·keys.</p></section>191 ·</span><span·class="p"·data-group-id="2981964397-3">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">des3_cbc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2981964397-4">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·249,·SHA:·e3783176eaf554ac228244a04845a6d1cd4124798b5f3b142afe6db178bb0b3e·...·]-1">]</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Do·not·use·any·of·the·keys·in·these·examples.·Use·your·own·keys.</p></section>
192 ····</section>192 ····</section>
  
193 </div>193 </div>
  
194 ··<section·id="summary"·class="details-list">194 ··<section·id="summary"·class="details-list">
195 ····<h1·class="section-heading">195 ····<h1·class="section-heading">
196 ······<a·class="hover-link"·href="#summary">196 ······<a·class="hover-link"·href="#summary">
Offset 1494, 19 lines modifiedOffset 1494, 19 lines modified
1494 ························when·CryptoKeyFun·::·<a·href="#t:crypto_fun/0">crypto_fun</a>(),·Reason·::·badfun·|·exists·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1494 ························when·CryptoKeyFun·::·<a·href="#t:crypto_fun/0">crypto_fun</a>(),·Reason·::·badfun·|·exists·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1495 ······</div>1495 ······</div>
  
1496 <p>Registers·an·unary·fun·that·is·called·if·<code·class="inline">beam_lib</code>·must·read·an·<code·class="inline">debug_info</code>1496 <p>Registers·an·unary·fun·that·is·called·if·<code·class="inline">beam_lib</code>·must·read·an·<code·class="inline">debug_info</code>
1497 chunk·that·has·been·encrypted.·The·fun·is·held·in·a·process·that·is·started·by1497 chunk·that·has·been·encrypted.·The·fun·is·held·in·a·process·that·is·started·by
1498 the·function.</p><p>If·a·fun·is·already·registered·when·attempting·to·register·a·fun,1498 the·function.</p><p>If·a·fun·is·already·registered·when·attempting·to·register·a·fun,
1499 <code·class="inline">{error,·exists}</code>·is·returned.</p><p>The·fun·must·handle·the·following·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">CryptoKeyFun</span><span·class="p"·data-group-id="5928682556-1">(</span><span·class="ss">init</span><span·class="p"·data-group-id="5928682556-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span><sp[·...·truncated·by·diffoscope;·len:·509,·SHA:·8419a841057a58766e9924155613957757b82bac98c1c6f60165722e5dacf21a·...·]-3">}</span></code></pre><p>Called·when·the·fun·is·registered,·in·the·process·that·holds·the·fun.·Here·the1499 <code·class="inline">{error,·exists}</code>·is·returned.</p><p>The·fun·must·handle·the·following·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">CryptoKeyFun</span><span·class="p"·data-group-id="9386181485-1">(</span><span·class="ss">init</span><span·class="p"·data-group-id="9386181485-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">|</span><sp[·...·truncated·by·diffoscope;·len:·509,·SHA:·494537bb2cc4f3335072b2174ad699a20d14ea59efd510f0c017b93b5319c5f9·...·]-3">}</span></code></pre><p>Called·when·the·fun·is·registered,·in·the·process·that·holds·the·fun.·Here·the
1500 crypto·key·fun·can·do·any·necessary·initializations.·If·<code·class="inline">{ok,·NewCryptoKeyFun}</code>1500 crypto·key·fun·can·do·any·necessary·initializations.·If·<code·class="inline">{ok,·NewCryptoKeyFun}</code>
1501 is·returned,·<code·class="inline">NewCryptoKeyFun</code>·is·registered·instead·of·<code·class="inline">CryptoKeyFun</code>.·If1501 is·returned,·<code·class="inline">NewCryptoKeyFun</code>·is·registered·instead·of·<code·class="inline">CryptoKeyFun</code>.·If
1502 <code·class="inline">{error,·Term}</code>·is·returned,·the·registration·is·aborted·and1502 <code·class="inline">{error,·Term}</code>·is·returned,·the·registration·is·aborted·and
1503 <a·href="#crypto_key_fun/1"><code·class="inline">crypto_key_fun/1</code></a>·also·returns·<code·class="inline">{error,·Term}</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">CryptoKeyFun</span><span·class="p"·data-group-id="4592249840-1">(</span><span·class="p"·data-group-id="4592249840-2">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</[·...·truncated·by·diffoscope;·len:·178,·SHA:·e3a9e152d167a81e76ea73b7da5765eba816a09be209ac1be9df366f297c2185·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Key</span></code></pre><p>Called·when·the·key·is·needed·for·module·<code·class="inline">Module</code>·in·the·file·named·<code·class="inline">Filename</code>.1503 <a·href="#crypto_key_fun/1"><code·class="inline">crypto_key_fun/1</code></a>·also·returns·<code·class="inline">{error,·Term}</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">CryptoKeyFun</span><span·class="p"·data-group-id="1857786253-1">(</span><span·class="p"·data-group-id="1857786253-2">{</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</[·...·truncated·by·diffoscope;·len:·178,·SHA:·5be13c2b34b72a2fc6aa95a753f1aae38877cfb85347eb5c8897cf1fb841f70d·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Key</span></code></pre><p>Called·when·the·key·is·needed·for·module·<code·class="inline">Module</code>·in·the·file·named·<code·class="inline">Filename</code>.
1504 <code·class="inline">Mode</code>·is·the·type·of·crypto·algorithm;·currently,·the·only·possible·value·is1504 <code·class="inline">Mode</code>·is·the·type·of·crypto·algorithm;·currently,·the·only·possible·value·is
1505 <code·class="inline">des3_cbc</code>.·The·call·is·to·fail·(raise·an·exception)·if·no·key·is·available.</p><pre><code·class="text">CryptoKeyFun(clear)·-&gt;·term()</code></pre><p>Called·before·the·fun·is·unregistered.·Here·any·cleaning·up·can·be·done.·The1505 <code·class="inline">des3_cbc</code>.·The·call·is·to·fail·(raise·an·exception)·if·no·key·is·available.</p><pre><code·class="text">CryptoKeyFun(clear)·-&gt;·term()</code></pre><p>Called·before·the·fun·is·unregistered.·Here·any·cleaning·up·can·be·done.·The
1506 return·value·is·not·important,·but·is·passed·back·to·the·caller·of1506 return·value·is·not·important,·but·is·passed·back·to·the·caller·of
1507 <a·href="#clear_crypto_key_fun/0"><code·class="inline">clear_crypto_key_fun/0</code></a>·as·part·of·its·return·value.</p>1507 <a·href="#clear_crypto_key_fun/0"><code·class="inline">clear_crypto_key_fun/0</code></a>·as·part·of·its·return·value.</p>
1508 ··</section>1508 ··</section>
1509 </section>1509 </section>
1510 <section·class="detail"·id="diff_dirs/2">1510 <section·class="detail"·id="diff_dirs/2">
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1843 ······</div>1843 ······</div>
  
1844 <p>Returns·the·module·version·or·versions.·A·version·is·defined·by·module·attribute1844 <p>Returns·the·module·version·or·versions.·A·version·is·defined·by·module·attribute
1845 <code·class="inline">-vsn(Vsn)</code>.</p><p>If·this·attribute·is·not·specified,·the·version·defaults·to·the1845 <code·class="inline">-vsn(Vsn)</code>.</p><p>If·this·attribute·is·not·specified,·the·version·defaults·to·the
1846 checksum·of·the·module.·Notice·that·if·version·<code·class="inline">Vsn</code>·is·not·a·list,·it·is·made1846 checksum·of·the·module.·Notice·that·if·version·<code·class="inline">Vsn</code>·is·not·a·list,·it·is·made
1847 into·one,·that·is·<code·class="inline">{ok,{Module,[Vsn]}}</code>·is·returned.·If·there·are·many·<code·class="inline">-vsn</code>1847 into·one,·that·is·<code·class="inline">{ok,{Module,[Vsn]}}</code>·is·returned.·If·there·are·many·<code·class="inline">-vsn</code>
1848 module·attributes,·the·result·is·the·concatenated·list·of·versions.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="0522671907-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="0522671907-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·-vsn(1).</span><span·class="w">1848 module·attributes,·the·result·is·the·concatenated·list·of·versions.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="6889178967-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="6889178967-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·-vsn(1).</span><span·class="w">
1849 </span><span·class="p"·data-group-id="0522671907-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-4">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·9de205940e2391e6bb4a008a192b213a1a036f36c2cc411fa2cd5307a2ed53c1·...·]7-2">}</span><span·class="gp·unselectable">1849 </span><span·class="p"·data-group-id="6889178967-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-4">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·1ac8b8a68d8507c8c145cdbb66c3b249a622b9d41ac74c66a5a368504dc58c73·...·]7-2">}</span><span·class="gp·unselectable">
1850 2&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="0522671907-5">(</span><span·class="ss">b</span><span·class="p"·data-group-id="0522671907-5">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·-vsn([1]).</span><span·class="w">1850 2&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="6889178967-5">(</span><span·class="ss">b</span><span·class="p"·data-group-id="6889178967-5">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·-vsn([1]).</span><span·class="w">
1851 </span><span·class="p"·data-group-id="0522671907-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-7">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-8">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·cb20bdda8b11f012b56ac5a2201a914f74aadb7f1ec30706ba43f3e32efc2244·...·]7-6">}</span><span·class="gp·unselectable">1851 </span><span·class="p"·data-group-id="6889178967-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-7">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-8">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·142,·SHA:·841078381b6f471e379a0f8471755d612b3c3991488fe5a6609fffe615126e29·...·]7-6">}</span><span·class="gp·unselectable">
1852 3&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="0522671907-9">(</span><span·class="ss">c</span><span·class="p"·data-group-id="0522671907-9">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·-vsn([1]).·-vsn(2).</span><span·class="w">1852 3&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="6889178967-9">(</span><span·class="ss">c</span><span·class="p"·data-group-id="6889178967-9">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·-vsn([1]).·-vsn(2).</span><span·class="w">
1853 </span><span·class="p"·data-group-id="0522671907-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-11">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-12">[</span><span·class="mi">1</span><[·...·truncated·by·diffoscope;·len:·196,·SHA:·97359da2c4acd785edf8e1616019da724f23dcafc42a6d442c8458e702330f1b·...·]7-10">}</span><span·class="gp·unselectable">1853 </span><span·class="p"·data-group-id="6889178967-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-11">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-12">[</span><span·class="mi">1</span><[·...·truncated·by·diffoscope;·len:·196,·SHA:·bed4768a9ef7e30867af3a861d15005be1c0aec593d6a0e20ab13ab15b526f40·...·]7-10">}</span><span·class="gp·unselectable">
1854 4&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="0522671907-13">(</span><span·class="ss">d</span><span·class="p"·data-group-id="0522671907-13">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·no·-vsn·attribute</span><span·class="w">1854 4&gt;·</span><span·class="nc">beam_lib</span><span·class="p">:</span><span·class="nf">version</span><span·class="p"·data-group-id="6889178967-13">(</span><span·class="ss">d</span><span·class="p"·data-group-id="6889178967-13">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·no·-vsn·attribute</span><span·class="w">
1855 </span><span·class="p"·data-group-id="0522671907-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-15">{</span><span·class="ss">d</span><span·class="p">,</span><span·class="p"·data-group-id="0522671907-16">[</span><span·class="mi">275613208[·...·truncated·by·diffoscope;·len:·185,·SHA:·e12eb9054077e289e3cb438339926e87c3236a1ae386c706148c058b6c8a2de5·...·]7-14">}</span></code></pre>1855 </span><span·class="p"·data-group-id="6889178967-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-15">{</span><span·class="ss">d</span><span·class="p">,</span><span·class="p"·data-group-id="6889178967-16">[</span><span·class="mi">275613208[·...·truncated·by·diffoscope;·len:·185,·SHA:·c054e5ab75c17f4a45a20c8397ff45d7b452c61192a90c2816076255bd8494f6·...·]7-14">}</span></code></pre>
1856 ··</section>1856 ··</section>
1857 </section>1857 </section>
  
1858 ····</div>1858 ····</div>
1859 ··</section>1859 ··</section>
  
1860 ····<footer·class="footer">1860 ····<footer·class="footer">
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1879 ······<p·class="built-using">1879 ······<p·class="built-using">
1880 ········Built·using1880 ········Built·using
1881 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1881 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1882 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1882 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1883 ······</p>1883 ······</p>
1884 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1884 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1885 ····</footer>1885 ····</footer>
1886 ··</div>1886 ··</div>
1887 </main>1887 </main>
1888 </div>1888 </div>
1889 <script>1889 <script>
1890 ··function·mermaidLoaded()·{1890 ··function·mermaidLoaded()·{
1891 ····mermaid.initialize({1891 ····mermaid.initialize({
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631 ······<div·class="specs">631 ······<div·class="specs">
  
632 ··········<pre·translate="no"><span·class="attribute">-spec</span>·bin_to_list(Subject)·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0">byte</a>()]·when·Subject·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>632 ··········<pre·translate="no"><span·class="attribute">-spec</span>·bin_to_list(Subject)·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0">byte</a>()]·when·Subject·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>
  
633 ······</div>633 ······</div>
  
634 <p>Converts·<code·class="inline">Subject</code>·to·a·list·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a>s,·each·representing·the·value·of·one·byte.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">bin_to_list</span><span·class="p"·data-group-id="2843994720-1">(</span><span·class="p"·data-group-id="2843994720-2">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="2843994720-2">&gt;&gt;</span><span·class="p"·data-group-id="2843994720-1">)</span><span·class="p">.</span><span·class="w">634 <p>Converts·<code·class="inline">Subject</code>·to·a·list·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a>s,·each·representing·the·value·of·one·byte.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">bin_to_list</span><span·class="p"·data-group-id="2717233186-1">(</span><span·class="p"·data-group-id="2717233186-2">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="2717233186-2">&gt;&gt;</span><span·class="p"·data-group-id="2717233186-1">)</span><span·class="p">.</span><span·class="w">
635 </span><span·class="s">&quot;erlang&quot;</span><span·class="w">635 </span><span·class="s">&quot;erlang&quot;</span><span·class="w">
636 </span><span·class="c1">%%·or·[101,114,108,97,110,103]·in·list·notation.</span></code></pre>636 </span><span·class="c1">%%·or·[101,114,108,97,110,103]·in·list·notation.</span></code></pre>
637 ··</section>637 ··</section>
638 </section>638 </section>
639 <section·class="detail"·id="bin_to_list/2">639 <section·class="detail"·id="bin_to_list/2">
  
640 ··<div·class="detail-header">640 ··<div·class="detail-header">
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693 ·····················when·Subject·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·Pos·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·Len·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>().</pre>693 ·····················when·Subject·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·Pos·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·Len·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>().</pre>
  
694 ······</div>694 ······</div>
  
695 <p>Converts·<code·class="inline">Subject</code>·to·a·list·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a>s,·each·representing·the·value·of·one695 <p>Converts·<code·class="inline">Subject</code>·to·a·list·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:byte/0"><code·class="inline">byte/0</code></a>s,·each·representing·the·value·of·one
696 byte.·<code·class="inline">PosLen</code>·or·alternatively·<code·class="inline">Pos</code>·and·<code·class="inline">Len</code>·denote·which·part·of·the696 byte.·<code·class="inline">PosLen</code>·or·alternatively·<code·class="inline">Pos</code>·and·<code·class="inline">Len</code>·denote·which·part·of·the
697 <code·class="inline">Subject</code>·binary·to·convert.·By·default,·the·entire·<code·class="inline">Subject</code>·binary·is697 <code·class="inline">Subject</code>·binary·to·convert.·By·default,·the·entire·<code·class="inline">Subject</code>·binary·is
698 converted.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">bin_to_list</span><span·class="p"·data-group-id="0925173181-1">(</span><span·class="p"·data-group-id="0925173181-2">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="0925173181-2">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·196,·SHA:·1f471a8317d1c45592af6eba8b2845ae2b9f6ded894b509befd2d0198b8b40af·...·]-1">)</span><span·class="p">.</span><span·class="w">698 converted.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">bin_to_list</span><span·class="p"·data-group-id="6116994742-1">(</span><span·class="p"·data-group-id="6116994742-2">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="6116994742-2">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·196,·SHA:·214db73352fcf977221dc96a50e33ddd7f23a4e952e0bc8c59d3a417ff9c9581·...·]-1">)</span><span·class="p">.</span><span·class="w">
699 </span><span·class="s">&quot;rla&quot;</span><span·class="w">699 </span><span·class="s">&quot;rla&quot;</span><span·class="w">
700 </span><span·class="c1">%%·or·[114,108,97]·in·list·notation.</span></code></pre><p>If·<code·class="inline">PosLen</code>·or·alternatively·<code·class="inline">Pos</code>·and·<code·class="inline">Len</code>·in·any·way·reference·outside·the700 </span><span·class="c1">%%·or·[114,108,97]·in·list·notation.</span></code></pre><p>If·<code·class="inline">PosLen</code>·or·alternatively·<code·class="inline">Pos</code>·and·<code·class="inline">Len</code>·in·any·way·reference·outside·the
701 binary,·a·<code·class="inline">badarg</code>·exception·is·raised.</p>701 binary,·a·<code·class="inline">badarg</code>·exception·is·raised.</p>
702 ··</section>702 ··</section>
703 </section>703 </section>
704 <section·class="detail"·id="compile_pattern/1">704 <section·class="detail"·id="compile_pattern/1">
  
Offset 827, 16 lines modifiedOffset 827, 16 lines modified
  
827 ······<div·class="specs">827 ······<div·class="specs">
  
828 ··········<pre·translate="no"><span·class="attribute">-spec</span>·decode_hex(Bin)·->·Bin2·when·Bin·::·<<_:_*16>>,·Bin2·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>828 ··········<pre·translate="no"><span·class="attribute">-spec</span>·decode_hex(Bin)·->·Bin2·when·Bin·::·<<_:_*16>>,·Bin2·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>().</pre>
  
829 ······</div>829 ······</div>
  
830 <p>Decodes·a·hex·encoded·binary·into·a·binary.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_hex</span><span·class="p"·data-group-id="1926462783-1">(</span><span·class="p"·data-group-id="1926462783-2">&lt;&lt;</span><span·class="s">&quot;66&quot;</span><span·class="p"·data-group-id="1926462783-2">&gt;&gt;</span><span·class="p"·data-group-id="1926462783-1">)</span><span·class="p">.</span><span·class="w">830 <p>Decodes·a·hex·encoded·binary·into·a·binary.</p><p><em>Example</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_hex</span><span·class="p"·data-group-id="3060680797-1">(</span><span·class="p"·data-group-id="3060680797-2">&lt;&lt;</span><span·class="s">&quot;66&quot;</span><span·class="p"·data-group-id="3060680797-2">&gt;&gt;</span><span·class="p"·data-group-id="3060680797-1">)</span><span·class="p">.</span><span·class="w">
831 </span><span·class="p"·data-group-id="1926462783-3">&lt;&lt;</span><span·class="s">&quot;f&quot;</span><span·class="p"·data-group-id="1926462783-3">&gt;&gt;</span></code></pre>831 </span><span·class="p"·data-group-id="3060680797-3">&lt;&lt;</span><span·class="s">&quot;f&quot;</span><span·class="p"·data-group-id="3060680797-3">&gt;&gt;</span></code></pre>
832 ··</section>832 ··</section>
833 </section>833 </section>
834 <section·class="detail"·id="decode_unsigned/1">834 <section·class="detail"·id="decode_unsigned/1">
  
835 ··<div·class="detail-header">835 ··<div·class="detail-header">
836 ····<a·href="#decode_unsigned/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">836 ····<a·href="#decode_unsigned/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
837 ······<i·class="ri-link-m"·aria-hidden="true"></i>837 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 889, 19 lines modifiedOffset 889, 19 lines modified
889 ·····························Subject·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),889 ·····························Subject·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),
890 ·····························Endianness·::·big·|·little,890 ·····························Endianness·::·big·|·little,
891 ·····························Unsigned·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>().</pre>891 ·····························Unsigned·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>().</pre>
  
892 ······</div>892 ······</div>
  
893 <p>Converts·the·binary·digit·representation,·in·big·endian·or·little·endian,·of·a893 <p>Converts·the·binary·digit·representation,·in·big·endian·or·little·endian,·of·a
894 positive·integer·in·<code·class="inline">Subject</code>·to·an·Erlang·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_unsigned</span><span·class="p"·data-group-id="7765623221-1">(</span><span·class="p"·data-group-id="7765623221-2">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="7765623221-2">&[·...·truncated·by·diffoscope;·len:·55,·SHA:·ed1a77f6daf7fcf4eab5913ec50c7d98ec389f1301fa863234e03ad3e06b0f99·...·]-1">)</span><span·class="p">.</span><span·class="w">894 positive·integer·in·<code·class="inline">Subject</code>·to·an·Erlang·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0"><code·class="inline">integer/0</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_unsigned</span><span·class="p"·data-group-id="7022765986-1">(</span><span·class="p"·data-group-id="7022765986-2">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="7022765986-2">&[·...·truncated·by·diffoscope;·len:·55,·SHA:·0661835aa211ba0b8cc2ca0b8322861a3eb764f6299d1fab49449f81d7b33468·...·]-1">)</span><span·class="p">.</span><span·class="w">
895 </span><span·class="mi">11111111</span><span·class="gp·unselectable">895 </span><span·class="mi">11111111</span><span·class="gp·unselectable">
896 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_unsigned</span><span·class="p"·data-group-id="7765623221-3">(</span><span·class="p"·data-group-id="7765623221-4">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="7765623221-4">&[·...·truncated·by·diffoscope;·len:·130,·SHA:·72272105e4b0c42170de0540fe277ed2c4c19ae7c0546894d8dcb9566436f897·...·]-3">)</span><span·class="p">.</span><span·class="w">896 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_unsigned</span><span·class="p"·data-group-id="7022765986-3">(</span><span·class="p"·data-group-id="7022765986-4">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="7022765986-4">&[·...·truncated·by·diffoscope;·len:·130,·SHA:·910e25f4b24b97412131a214ca5635852c5e461b8413b8d9795ce191b897e168·...·]-3">)</span><span·class="p">.</span><span·class="w">
897 </span><span·class="mi">11111111</span><span·class="gp·unselectable">897 </span><span·class="mi">11111111</span><span·class="gp·unselectable">
898 3&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_unsigned</span><span·class="p"·data-group-id="7765623221-5">(</span><span·class="p"·data-group-id="7765623221-6">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="7765623221-6">&[·...·truncated·by·diffoscope;·len:·133,·SHA:·c4e02c38603ceac3d52187fff7246f740d63f0b404ae1037403c8c0afc5d87d7·...·]-5">)</span><span·class="p">.</span><span·class="w">898 3&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">decode_unsigned</span><span·class="p"·data-group-id="7022765986-5">(</span><span·class="p"·data-group-id="7022765986-6">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="7022765986-6">&[·...·truncated·by·diffoscope;·len:·133,·SHA:·0c60e3f51b1dd025217d7e953dc9e0a0f98453edd8fbf3e6fe726ae9e980fc62·...·]-5">)</span><span·class="p">.</span><span·class="w">
899 </span><span·class="mi">13077161</span></code></pre>899 </span><span·class="mi">13077161</span></code></pre>
900 ··</section>900 ··</section>
901 </section>901 </section>
902 <section·class="detail"·id="encode_hex/1">902 <section·class="detail"·id="encode_hex/1">
  
903 ··<div·class="detail-header">903 ··<div·class="detail-header">
904 ····<a·href="#encode_hex/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">904 ····<a·href="#encode_hex/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 952, 22 lines modifiedOffset 952, 22 lines modified
  
952 ··········<pre·translate="no"><span·class="attribute">-spec</span>·encode_hex(Bin,·Case)·->·Bin2952 ··········<pre·translate="no"><span·class="attribute">-spec</span>·encode_hex(Bin,·Case)·->·Bin2
953 ····················when·Bin·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·Case·::·lowercase·|·uppercase,·Bin2·::·<<_:_*16>>.</pre>953 ····················when·Bin·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·Case·::·lowercase·|·uppercase,·Bin2·::·<<_:_*16>>.</pre>
  
954 ······</div>954 ······</div>
  
955 <p>Encodes·a·binary·into·a·hex·encoded·binary·using·the·specified·case·for·the955 <p>Encodes·a·binary·into·a·hex·encoded·binary·using·the·specified·case·for·the
956 hexadecimal·digits·&quot;a&quot;·to·&quot;f&quot;.</p><p>The·default·case·is·<code·class="inline">uppercase</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="5880122651-1">(</span><span·class="p"·data-group-id="5880122651-2">&lt;&lt;</span><span·class="s">&quot;f&quot;</span><span·class="p"·data-group-id="5880122651-2">&gt;&gt;</span><span·class="p"·data-group-id="5880122651-1">)</span><span·class="p">.</span><span·class="w">956 hexadecimal·digits·&quot;a&quot;·to·&quot;f&quot;.</p><p>The·default·case·is·<code·class="inline">uppercase</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="7566249983-1">(</span><span·class="p"·data-group-id="7566249983-2">&lt;&lt;</span><span·class="s">&quot;f&quot;</span><span·class="p"·data-group-id="7566249983-2">&gt;&gt;</span><span·class="p"·data-group-id="7566249983-1">)</span><span·class="p">.</span><span·class="w">
957 </span><span·class="p"·data-group-id="5880122651-3">&lt;&lt;</span><span·class="s">&quot;66&quot;</span><span·class="p"·data-group-id="5880122651-3">&gt;&gt;</span><span·class="gp·unselectable">957 </span><span·class="p"·data-group-id="7566249983-3">&lt;&lt;</span><span·class="s">&quot;66&quot;</span><span·class="p"·data-group-id="7566249983-3">&gt;&gt;</span><span·class="gp·unselectable">
958 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="5880122651-4">(</span><span·class="p"·data-group-id="5880122651-5">&lt;&lt;</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="5880122651-5">&gt;&gt;</span><span·class="p"·data-group-id="5880122651-4">)</span><span·class="p">.</span><span·class="w">958 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="7566249983-4">(</span><span·class="p"·data-group-id="7566249983-5">&lt;&lt;</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="7566249983-5">&gt;&gt;</span><span·class="p"·data-group-id="7566249983-4">)</span><span·class="p">.</span><span·class="w">
959 </span><span·class="p"·data-group-id="5880122651-6">&lt;&lt;</span><span·class="s">&quot;2F&quot;</span><span·class="p"·data-group-id="5880122651-6">&gt;&gt;</span><span·class="gp·unselectable">959 </span><span·class="p"·data-group-id="7566249983-6">&lt;&lt;</span><span·class="s">&quot;2F&quot;</span><span·class="p"·data-group-id="7566249983-6">&gt;&gt;</span><span·class="gp·unselectable">
960 3&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="5880122651-7">(</span><span·class="p"·data-group-id="5880122651-8">&lt;&lt;</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="5880122651-8">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">lowercase</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·53deb5bb864d3f374af11cd07380524c3d0b168368d9ce44a813961b32e042b6·...·]-7">)</span><span·class="p">.</span><span·class="w">960 3&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="7566249983-7">(</span><span·class="p"·data-group-id="7566249983-8">&lt;&lt;</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="7566249983-8">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">lowercase</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·a79ebe9db3f7544d6dc764b8f3096395b132a4abfc7e92f66b98f5a18172b314·...·]-7">)</span><span·class="p">.</span><span·class="w">
961 </span><span·class="p"·data-group-id="5880122651-9">&lt;&lt;</span><span·class="s">&quot;2f&quot;</span><span·class="p"·data-group-id="5880122651-9">&gt;&gt;</span><span·class="gp·unselectable">961 </span><span·class="p"·data-group-id="7566249983-9">&lt;&lt;</span><span·class="s">&quot;2f&quot;</span><span·class="p"·data-group-id="7566249983-9">&gt;&gt;</span><span·class="gp·unselectable">
962 4&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="5880122651-10">(</span><span·class="p"·data-group-id="5880122651-11">&lt;&lt;</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="5880122651-11">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">uppercase<[·...·truncated·by·diffoscope;·len:·47,·SHA:·898daaf6ef3fa815bc4f66c22ce6e35f05eeff1dc713694c86c23b47cf4579f2·...·]-10">)</span><span·class="p">.</span><span·class="w">962 4&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_hex</span><span·class="p"·data-group-id="7566249983-10">(</span><span·class="p"·data-group-id="7566249983-11">&lt;&lt;</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="7566249983-11">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">uppercase<[·...·truncated·by·diffoscope;·len:·47,·SHA:·12d1ad318783c63aea9365e2c0cc2b30406c3e3a16164a0181a0e53ef39db7da·...·]-10">)</span><span·class="p">.</span><span·class="w">
963 </span><span·class="p"·data-group-id="5880122651-12">&lt;&lt;</span><span·class="s">&quot;2F&quot;</span><span·class="p"·data-group-id="5880122651-12">&gt;&gt;</span></code></pre>963 </span><span·class="p"·data-group-id="7566249983-12">&lt;&lt;</span><span·class="s">&quot;2F&quot;</span><span·class="p"·data-group-id="7566249983-12">&gt;&gt;</span></code></pre>
964 ··</section>964 ··</section>
965 </section>965 </section>
966 <section·class="detail"·id="encode_unsigned/1">966 <section·class="detail"·id="encode_unsigned/1">
  
967 ··<div·class="detail-header">967 ··<div·class="detail-header">
968 ····<a·href="#encode_unsigned/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">968 ····<a·href="#encode_unsigned/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
969 ······<i·class="ri-link-m"·aria-hidden="true"></i>969 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1017, 20 lines modifiedOffset 1017, 20 lines modified
  
1017 ··········<pre·translate="no"><span·class="attribute">-spec</span>·encode_unsigned(Unsigned,·Endianness)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()1017 ··········<pre·translate="no"><span·class="attribute">-spec</span>·encode_unsigned(Unsigned,·Endianness)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()
1018 ·························when·Unsigned·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·Endianness·::·big·|·little.</pre>1018 ·························when·Unsigned·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·Endianness·::·big·|·little.</pre>
  
1019 ······</div>1019 ······</div>
  
1020 <p>Converts·a·positive·integer·to·the·smallest·possible·representation·in·a·binary1020 <p>Converts·a·positive·integer·to·the·smallest·possible·representation·in·a·binary
1021 digit·representation,·either·big·endian·or·little·endian.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_unsigned</span><span·class="p"·data-group-id="2025553906-1">(</span><span·class="mi">11111111</span><span·class="p"·data-group-id="2025553906-1">)</span><span·class="p">.</span><span·class="w">1021 digit·representation,·either·big·endian·or·little·endian.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_unsigned</span><span·class="p"·data-group-id="1587379413-1">(</span><span·class="mi">11111111</span><span·class="p"·data-group-id="1587379413-1">)</span><span·class="p">.</span><span·class="w">
1022 </span><span·class="p"·data-group-id="2025553906-2">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="2025553906-2">&gt;&gt;</span><span·class="gp·unselectable">1022 </span><span·class="p"·data-group-id="1587379413-2">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="1587379413-2">&gt;&gt;</span><span·class="gp·unselectable">
1023 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_unsigned</span><span·class="p"·data-group-id="2025553906-3">(</span><span·class="mi">11111111</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">big</span><span·class="p"·data-group-id="2025553906-3">)</span><span·class="p">.</span><span·class="w">1023 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_unsigned</span><span·class="p"·data-group-id="1587379413-3">(</span><span·class="mi">11111111</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">big</span><span·class="p"·data-group-id="1587379413-3">)</span><span·class="p">.</span><span·class="w">
1024 </span><span·class="p"·data-group-id="2025553906-4">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="2025553906-4">&gt;&gt;</span><span·class="gp·unselectable">1024 </span><span·class="p"·data-group-id="1587379413-4">&lt;&lt;</span><span·class="mi">169</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">199</span><span·class="p"·data-group-id="1587379413-4">&gt;&gt;</span><span·class="gp·unselectable">
1025 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_unsigned</span><span·class="p"·data-group-id="2025553906-5">(</span><span·class="mi">11111111</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">little</span><span·class="p"·data-group-id="2025553906-5">)</span><span·class="p">.</span><span·class="w">1025 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">encode_unsigned</span><span·class="p"·data-group-id="1587379413-5">(</span><span·class="mi">11111111</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">little</span><span·class="p"·data-group-id="1587379413-5">)</span><span·class="p">.</span><span·class="w">
1026 </span><span·class="p"·data-group-id="2025553906-6">&lt;&lt;</span><span·class="mi">199</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">169</span><span·class="p"·data-group-id="2025553906-6">&gt;&gt;</span></code></pre>1026 </span><span·class="p"·data-group-id="1587379413-6">&lt;&lt;</span><span·class="mi">199</span><span·class="p">,</span><span·class="mi">138</span><span·class="p">,</span><span·class="mi">169</span><span·class="p"·data-group-id="1587379413-6">&gt;&gt;</span></code></pre>
1027 ··</section>1027 ··</section>
1028 </section>1028 </section>
1029 <section·class="detail"·id="first/1">1029 <section·class="detail"·id="first/1">
  
1030 ··<div·class="detail-header">1030 ··<div·class="detail-header">
1031 ····<a·href="#first/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1031 ····<a·href="#first/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1032 ······<i·class="ri-link-m"·aria-hidden="true"></i>1032 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1137 ······<div·class="specs">1137 ······<div·class="specs">
  
1138 ··········<pre·translate="no"><span·class="attribute">-spec</span>·longest_common_prefix(Binaries)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>()·when·Binaries·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·...].</pre>1138 ··········<pre·translate="no"><span·class="attribute">-spec</span>·longest_common_prefix(Binaries)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>()·when·Binaries·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>(),·...].</pre>
  
1139 ······</div>1139 ······</div>
  
1140 <p>Returns·the·length·of·the·longest·common·prefix·of·the·binaries·in·list1140 <p>Returns·the·length·of·the·longest·common·prefix·of·the·binaries·in·list
1141 <code·class="inline">Binaries</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">longest_common_prefix</span><span·class="p"·data-group-id="9520489250-1">(</span><span·class="p"·data-group-id="9520489250-2">[</span><span·class="p"·data-group-id="9520489250-3">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="9520489250-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·285,·SHA:·81378ba9d29cc62b34e6a51c2801dfde6a7a63528c89400054ab0f6c0982c33c·...·]-1">)</span><span·class="p">.</span><span·class="w">1141 <code·class="inline">Binaries</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">longest_common_prefix</span><span·class="p"·data-group-id="8747838632-1">(</span><span·class="p"·data-group-id="8747838632-2">[</span><span·class="p"·data-group-id="8747838632-3">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="8747838632-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·285,·SHA:·fddfd1afe50a8d646af68f4f9064944f5443e198931a26cb9e370c95c2ec0535·...·]-1">)</span><span·class="p">.</span><span·class="w">
1142 </span><span·class="mi">2</span><span·class="gp·unselectable">1142 </span><span·class="mi">2</span><span·class="gp·unselectable">
1143 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">longest_common_prefix</span><span·class="p"·data-group-id="9520489250-5">(</span><span·class="p"·data-group-id="9520489250-6">[</span><span·class="p"·data-group-id="9520489250-7">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="9520489250-7">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·281,·SHA:·853d5cb3b7a0d366993bf6abdb1f2d1797e33f705e6f23495cf21fc9ea7f1811·...·]-5">)</span><span·class="p">.</span><span·class="w">1143 2&gt;·</span><span·class="nc">binary</span><span·class="p">:</span><span·class="nf">longest_common_prefix</span><span·class="p"·data-group-id="8747838632-5">(</span><span·class="p"·data-group-id="8747838632-6">[</span><span·class="p"·data-group-id="8747838632-7">&lt;&lt;</span><span·class="s">&quot;erlang&quot;</span><span·class="p"·data-group-id="8747838632-7">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·281,·SHA:·9888e5fba5ac4a1b8e68ae1c10a61c32e2a433e3e9f511a7d54b3e4599402c2e·...·]-5">)</span><span·class="p">.</span><span·class="w">
1144 </span><span·class="mi">0</span></code></pre><p>If·<code·class="inline">Binaries</code>·is·not·a·flat·non-empty·list·of·binaries,·a·<code·class="inline">badarg</code>·exception·is1144 </span><span·class="mi">0</span></code></pre><p>If·<code·class="inline">Binaries</code>·is·not·a·flat·non-empty·list·of·binaries,·a·<code·class="inline">badarg</code>·exception·is
1145 raised.</p>1145 raised.</p>
1146 ··</section>1146 ··</section>
1147 </section>1147 </section>
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1682 ················Options·::·[Option]·|·Option,1682 ················Options·::·[Option]·|·Option,
1683 ················Option·::·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html#t:option/0">compile:option</a>(),1683 ················Option·::·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html#t:option/0">compile:option</a>(),
1684 ················Module·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:module/0">module</a>().</pre>1684 ················Module·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:module/0">module</a>().</pre>
  
1685 ······</div>1685 ······</div>
  
1686 <p>Compiles·and·then·loads·the·code·for·a·file·on·all·nodes.·<code·class="inline">Options</code>·defaults·to1686 <p>Compiles·and·then·loads·the·code·for·a·file·on·all·nodes.·<code·class="inline">Options</code>·defaults·to
1687 <code·class="inline">[]</code>.·Compilation·is·equivalent·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="9075155340-1">(</span><span·class="n">File</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="9075155340-2">[</span><sp[·...·truncated·by·diffoscope;·len:·215,·SHA:·b7c54c5ed733da3bf91bb63adda90ac718913a6f190306e74a484382d0890e31·...·]-1">)</span></code></pre>1687 <code·class="inline">[]</code>.·Compilation·is·equivalent·to:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">compile</span><span·class="p">:</span><span·class="nf">file</span><span·class="p"·data-group-id="5136595395-1">(</span><span·class="n">File</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Options</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="p"·data-group-id="5136595395-2">[</span><sp[·...·truncated·by·diffoscope;·len:·215,·SHA:·167c7d127231474df5fae4938a43e567f0772188be525407129b4b4706f872b9·...·]-1">)</span></code></pre>
1688 ··</section>1688 ··</section>
1689 </section>1689 </section>
1690 <section·class="detail"·id="ni/0">1690 <section·class="detail"·id="ni/0">
  
1691 ··<div·class="detail-header">1691 ··<div·class="detail-header">
1692 ····<a·href="#ni/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1692 ····<a·href="#ni/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1693 ······<i·class="ri-link-m"·aria-hidden="true"></i>1693 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 2007, 15 lines modifiedOffset 2007, 15 lines modified
2007 ······<p·class="built-using">2007 ······<p·class="built-using">
2008 ········Built·using2008 ········Built·using
2009 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2009 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2010 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2010 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2011 ······</p>2011 ······</p>
2012 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2012 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2013 ····</footer>2013 ····</footer>
2014 ··</div>2014 ··</div>
2015 </main>2015 </main>
2016 </div>2016 </div>
2017 <script>2017 <script>
2018 ··function·mermaidLoaded()·{2018 ··function·mermaidLoaded()·{
2019 ····mermaid.initialize({2019 ····mermaid.initialize({
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Offset 1765, 18 lines modifiedOffset 1765, 18 lines modified
1765 ····································Option·::·{unit,·<a·href="#t:rfc3339_time_unit/0">rfc3339_time_unit</a>()}.</pre>1765 ····································Option·::·{unit,·<a·href="#t:rfc3339_time_unit/0">rfc3339_time_unit</a>()}.</pre>
  
1766 ······</div>1766 ······</div>
  
1767 <p>Converts·an·RFC·3339·timestamp·into·system·time.·The·data·format·of·RFC·33391767 <p>Converts·an·RFC·3339·timestamp·into·system·time.·The·data·format·of·RFC·3339
1768 timestamps·is·described·by·<a·href="https://www.ietf.org/rfc/rfc3339.txt">RFC·3339</a>.1768 timestamps·is·described·by·<a·href="https://www.ietf.org/rfc/rfc3339.txt">RFC·3339</a>.
1769 Starting·from·OTP·25.1,·the·minutes·part·of·the·time·zone·is·optional.</p><p>Valid·option:</p><ul><li><strong><code·class="inline">{unit,·Unit}</code></strong>·-·The·time·unit·of·the·return·value.·The·default·is1769 Starting·from·OTP·25.1,·the·minutes·part·of·the·time·zone·is·optional.</p><p>Valid·option:</p><ul><li><strong><code·class="inline">{unit,·Unit}</code></strong>·-·The·time·unit·of·the·return·value.·The·default·is
1770 <code·class="inline">second</code>.</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">rfc3339_to_system_time</span><span·class="p"·data-group-id="9236594900-1">(</span><span·class="s">&quot;2018-02-01T16:17:58+01:00&quot;</span><span·class="p"·data-group-id="9236594900-1">)</span><span·class="p">.</span><span·class="w">1770 <code·class="inline">second</code>.</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">rfc3339_to_system_time</span><span·class="p"·data-group-id="9623011243-1">(</span><span·class="s">&quot;2018-02-01T16:17:58+01:00&quot;</span><span·class="p"·data-group-id="9623011243-1">)</span><span·class="p">.</span><span·class="w">
1771 </span><span·class="mi">1517498278</span><span·class="gp·unselectable">1771 </span><span·class="mi">1517498278</span><span·class="gp·unselectable">
1772 2&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">rfc3339_to_system_time</span><span·class="p"·data-group-id="9236594900-2">(</span><span·class="s">&quot;2018-02-01·15:18:02.088Z&quot;</span><span·class="p">,</span><span·class="w">1772 2&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">rfc3339_to_system_time</span><span·class="p"·data-group-id="9623011243-2">(</span><span·class="s">&quot;2018-02-01·15:18:02.088Z&quot;</span><span·class="p">,</span><span·class="w">
1773 ···</span><span·class="p"·data-group-id="9236594900-3">[</span><span·class="p"·data-group-id="9236594900-4">{</span><span·class="ss">unit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">nanosecond</span><span·class="p"·data-group-id="9236594900-4">}</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·75,·SHA:·e952eb1fae27824e692579c0254c5beb86be1169f73c9b294db4bb1284a07a12·...·]-2">)</span><span·class="p">.</span><span·class="w">1773 ···</span><span·class="p"·data-group-id="9623011243-3">[</span><span·class="p"·data-group-id="9623011243-4">{</span><span·class="ss">unit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">nanosecond</span><span·class="p"·data-group-id="9623011243-4">}</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·75,·SHA:·124a6803b8bc8731d4f34be641f8298ad5359a99eea58ca81785807eff3d2694·...·]-2">)</span><span·class="p">.</span><span·class="w">
1774 </span><span·class="mi">1517498282088000000</span></code></pre>1774 </span><span·class="mi">1517498282088000000</span></code></pre>
1775 ··</section>1775 ··</section>
1776 </section>1776 </section>
1777 <section·class="detail"·id="seconds_to_daystime/1">1777 <section·class="detail"·id="seconds_to_daystime/1">
  
1778 ··<div·class="detail-header">1778 ··<div·class="detail-header">
1779 ····<a·href="#seconds_to_daystime/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1779 ····<a·href="#seconds_to_daystime/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1928, 24 lines modifiedOffset 1928, 24 lines modified
1928 interpreted·as·local·time.·A·non-empty·string·is·included·as·is.·The·time·unit1928 interpreted·as·local·time.·A·non-empty·string·is·included·as·is.·The·time·unit
1929 of·the·integer·is·the·same·as·the·one·of·<code·class="inline">Time</code>.</p></li><li><p><strong><code·class="inline">{time_designator,·Character}</code></strong>·-·The·character·used·as·time·designator,1929 of·the·integer·is·the·same·as·the·one·of·<code·class="inline">Time</code>.</p></li><li><p><strong><code·class="inline">{time_designator,·Character}</code></strong>·-·The·character·used·as·time·designator,
1930 that·is,·the·date·and·time·separator.·The·default·is·<code·class="inline">$T</code>.</p></li><li><p><strong><code·class="inline">{unit,·Unit}</code></strong>·-·The·time·unit·of·<code·class="inline">Time</code>.·The·default·is·<code·class="inline">second</code>.·If·some1930 that·is,·the·date·and·time·separator.·The·default·is·<code·class="inline">$T</code>.</p></li><li><p><strong><code·class="inline">{unit,·Unit}</code></strong>·-·The·time·unit·of·<code·class="inline">Time</code>.·The·default·is·<code·class="inline">second</code>.·If·some
1931 other·unit·is·given·(<code·class="inline">millisecond</code>,·<code·class="inline">microsecond</code>,·<code·class="inline">nanosecond</code>,·or·<code·class="inline">native</code>),1931 other·unit·is·given·(<code·class="inline">millisecond</code>,·<code·class="inline">microsecond</code>,·<code·class="inline">nanosecond</code>,·or·<code·class="inline">native</code>),
1932 the·formatted·string·includes·a·fraction·of·a·second.·The·number·of·fractional1932 the·formatted·string·includes·a·fraction·of·a·second.·The·number·of·fractional
1933 second·digits·is·three,·six,·or·nine·depending·on·what·time·unit·is·chosen.1933 second·digits·is·three,·six,·or·nine·depending·on·what·time·unit·is·chosen.
1934 For·<code·class="inline">native</code>·three·fractional·digits·are·included.·Notice·that·trailing·zeros1934 For·<code·class="inline">native</code>·three·fractional·digits·are·included.·Notice·that·trailing·zeros
1935 are·not·removed·from·the·fraction.</p></li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="9318507080-1">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="9318507080-2">(</span><span·class="ss">second</span><span·class="p"·data-group-id="9318507080-2">)</span><span·cla[·...·truncated·by·diffoscope;·len:·31,·SHA:·d56443aa40445869bf7e4d427e6feb610d716f36bda2c23ccdf5379a8cf2784e·...·]0-1">)</span><span·class="p">.</span><span·class="w">1935 are·not·removed·from·the·fraction.</p></li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="3324271510-1">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="3324271510-2">(</span><span·class="ss">second</span><span·class="p"·data-group-id="3324271510-2">)</span><span·cla[·...·truncated·by·diffoscope;·len:·31,·SHA:·c668ba2934e90f159f220f6f9f5a1081a64d7c2daf2903f0d033b264743b5cb3·...·]0-1">)</span><span·class="p">.</span><span·class="w">
1936 </span><span·class="s">&quot;2018-04-23T14:56:28+02:00&quot;</span><span·class="gp·unselectable">1936 </span><span·class="s">&quot;2018-04-23T14:56:28+02:00&quot;</span><span·class="gp·unselectable">
1937 2&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="9318507080-3">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="9318507080-4">(</span><span·class="ss">second</span><span·class="p"·data-group-id="9318507080-4">)</span><span·class="p">,</span><span·class="w">1937 2&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="3324271510-3">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="3324271510-4">(</span><span·class="ss">second</span><span·class="p"·data-group-id="3324271510-4">)</span><span·class="p">,</span><span·class="w">
1938 ···</span><span·class="p"·data-group-id="9318507080-5">[</span><span·class="p"·data-group-id="9318507080-6">{</span><span·class="ss">offset</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;-02:00&quot;</span><span·class="p"·data-group-id="9318507080-6">}</span><span·cla[·...·truncated·by·diffoscope;·len:·84,·SHA:·113123569b21657adfea5a244c383fcb90e73e8acbc170e6a6723d4a881a0d29·...·]0-3">)</span><span·class="p">.</span><span·class="w">1938 ···</span><span·class="p"·data-group-id="3324271510-5">[</span><span·class="p"·data-group-id="3324271510-6">{</span><span·class="ss">offset</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;-02:00&quot;</span><span·class="p"·data-group-id="3324271510-6">}</span><span·cla[·...·truncated·by·diffoscope;·len:·84,·SHA:·d126cfc685b962515c251151429a1a6eaff60aec1a46b8e81d463e0f3c80e0ca·...·]0-3">)</span><span·class="p">.</span><span·class="w">
1939 </span><span·class="s">&quot;2018-04-23T10:56:52-02:00&quot;</span><span·class="gp·unselectable">1939 </span><span·class="s">&quot;2018-04-23T10:56:52-02:00&quot;</span><span·class="gp·unselectable">
1940 3&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="9318507080-7">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="9318507080-8">(</span><span·class="ss">second</span><span·class="p"·data-group-id="9318507080-8">)</span><span·class="p">,</span><span·class="w">1940 3&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="3324271510-7">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="3324271510-8">(</span><span·class="ss">second</span><span·class="p"·data-group-id="3324271510-8">)</span><span·class="p">,</span><span·class="w">
1941 ···</span><span·class="p"·data-group-id="9318507080-9">[</span><span·class="p"·data-group-id="9318507080-10">{</span><span·class="ss">offset</span><span·class="p">,</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">7200</span><span·class="p"·data-group-id="9318507080-10">}</s[·...·truncated·by·diffoscope;·len:·97,·SHA:·2b445e5e0de03c7f2c18914f56429ed578474b165dcadbbaf40df0ef01ec951e·...·]0-7">)</span><span·class="p">.</span><span·class="w">1941 ···</span><span·class="p"·data-group-id="3324271510-9">[</span><span·class="p"·data-group-id="3324271510-10">{</span><span·class="ss">offset</span><span·class="p">,</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">7200</span><span·class="p"·data-group-id="3324271510-10">}</s[·...·truncated·by·diffoscope;·len:·97,·SHA:·6a2d33b6cc2c637773fdef6039b5609c32d708793d32c32008f95eeb3424529c·...·]0-7">)</span><span·class="p">.</span><span·class="w">
1942 </span><span·class="s">&quot;2018-04-23T10:57:05-02:00&quot;</span><span·class="gp·unselectable">1942 </span><span·class="s">&quot;2018-04-23T10:57:05-02:00&quot;</span><span·class="gp·unselectable">
1943 4&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="9318507080-11">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="9318507080-12">(</span><span·class="ss">millisecond</span><span·class="p"·data-group-id="9318507080-12">)</span><span·class="p">,</span><span·class="w">1943 4&gt;·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="3324271510-11">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_time</span><span·class="p"·data-group-id="3324271510-12">(</span><span·class="ss">millisecond</span><span·class="p"·data-group-id="3324271510-12">)</span><span·class="p">,</span><span·class="w">
1944 ···</span><span·class="p"·data-group-id="9318507080-13">[</span><span·class="p"·data-group-id="9318507080-14">{</span><span·class="ss">unit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">millisecond</span><span·class="p"·data-group-id="9318507080-14">}</span><span·class="p[·...·truncated·by·diffoscope;·len:·620,·SHA:·4081ba921df216f62ccbb0d870cdadc187ad8db2a3c4a64d5fda08743d16b2e7·...·]0-11">)</span><span·class="p">.</span><span·class="w">1944 ···</span><span·class="p"·data-group-id="3324271510-13">[</span><span·class="p"·data-group-id="3324271510-14">{</span><span·class="ss">unit</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">millisecond</span><span·class="p"·data-group-id="3324271510-14">}</span><span·class="p[·...·truncated·by·diffoscope;·len:·620,·SHA:·bcfd5a77afe0ecc28d7f77f1515373820937117ba922d4902d99d94f444645f7·...·]0-11">)</span><span·class="p">.</span><span·class="w">
1945 </span><span·class="s">&quot;2018-04-23·12:57:20.482Z&quot;</span></code></pre>1945 </span><span·class="s">&quot;2018-04-23·12:57:20.482Z&quot;</span></code></pre>
1946 ··</section>1946 ··</section>
1947 </section>1947 </section>
1948 <section·class="detail"·id="system_time_to_universal_time/2">1948 <section·class="detail"·id="system_time_to_universal_time/2">
  
1949 ··<div·class="detail-header">1949 ··<div·class="detail-header">
1950 ····<a·href="#system_time_to_universal_time/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1950 ····<a·href="#system_time_to_universal_time/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2158, 15 lines modifiedOffset 2158, 15 lines modified
2158 ······<p·class="built-using">2158 ······<p·class="built-using">
2159 ········Built·using2159 ········Built·using
2160 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2160 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2161 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2161 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2162 ······</p>2162 ······</p>
2163 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2163 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2164 ····</footer>2164 ····</footer>
2165 ··</div>2165 ··</div>
2166 </main>2166 </main>
2167 </div>2167 </div>
2168 <script>2168 <script>
2169 ··function·mermaidLoaded()·{2169 ··function·mermaidLoaded()·{
2170 ····mermaid.initialize({2170 ····mermaid.initialize({
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1846 ··········<pre·translate="no"><span·class="attribute">-spec</span>·lookup(Name,·Key)·->·Objects·|·{error,·Reason}1846 ··········<pre·translate="no"><span·class="attribute">-spec</span>·lookup(Name,·Key)·->·Objects·|·{error,·Reason}
1847 ················when·Name·::·<a·href="#t:tab_name/0">tab_name</a>(),·Key·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·Objects·::·[<a·href="#t:object/0">object</a>()],·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1847 ················when·Name·::·<a·href="#t:tab_name/0">tab_name</a>(),·Key·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·Objects·::·[<a·href="#t:object/0">object</a>()],·Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1848 ······</div>1848 ······</div>
  
1849 <p>Returns·a·list·of·all·objects·with·key·<code·class="inline">Key</code>·stored·in·table·<code·class="inline">Name</code>,·for1849 <p>Returns·a·list·of·all·objects·with·key·<code·class="inline">Key</code>·stored·in·table·<code·class="inline">Name</code>,·for
1850 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">open_file</span><span·class="p"·data-group-id="7999966526-1">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7999966526-2">[</span><span·class="p"·data-group-id="7999966526-3">{</span><span·class="ss">type</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·197,·SHA:·6ba4f7fe059eec49862519f77d01b2694deeb6266c452c6176491676993c7b4d·...·]-1">)</span><span·class="p">.</span><span·class="w">1850 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">open_file</span><span·class="p"·data-group-id="1746273651-1">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1746273651-2">[</span><span·class="p"·data-group-id="1746273651-3">{</span><span·class="ss">type</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·197,·SHA:·ae74a13a2840f61d92cea9b4beb157d0d22570d234432fc10c4a1a371b18aef6·...·]-1">)</span><span·class="p">.</span><span·class="w">
1851 </span><span·class="p"·data-group-id="7999966526-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">abc</span><span·class="p"·data-group-id="7999966526-4">}</span><span·class="gp·unselectable">1851 </span><span·class="p"·data-group-id="1746273651-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">abc</span><span·class="p"·data-group-id="1746273651-4">}</span><span·class="gp·unselectable">
1852 3&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="7999966526-5">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7999966526-6">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·111,·SHA:·234276c55e4cc86e33cfab55a940708a46da685fc605bcda430beae1bc7bacba·...·]-5">)</span><span·class="p">.</span><span·class="w">1852 3&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="1746273651-5">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1746273651-6">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·111,·SHA:·2b096ea8aff0a77ba8de25d6ab5ae11288c4d2c0c7ae7ff2f4163b510a8d162f·...·]-5">)</span><span·class="p">.</span><span·class="w">
1853 </span><span·class="ss">ok</span><span·class="gp·unselectable">1853 </span><span·class="ss">ok</span><span·class="gp·unselectable">
1854 4&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="7999966526-7">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7999966526-8">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·111,·SHA:·dfad0bd1cbe25bb0ee1380290f11c52916997aae89c6986b0f573428b8244a23·...·]-7">)</span><span·class="p">.</span><span·class="w">1854 4&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="1746273651-7">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1746273651-8">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·cl[·...·truncated·by·diffoscope;·len:·111,·SHA:·db84dea8f1d5ecfc07a543660fd71d49552e9b4a87cb30587ecc061d02a256d6·...·]-7">)</span><span·class="p">.</span><span·class="w">
1855 </span><span·class="ss">ok</span><span·class="gp·unselectable">1855 </span><span·class="ss">ok</span><span·class="gp·unselectable">
1856 5&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="7999966526-9">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7999966526-9">)</span><span·class="p">.</span><span·class="w">1856 5&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">lookup</span><span·class="p"·data-group-id="1746273651-9">(</span><span·class="ss">abc</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="1746273651-9">)</span><span·class="p">.</span><span·class="w">
1857 </span><span·class="p"·data-group-id="7999966526-10">[</span><span·class="p"·data-group-id="7999966526-11">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="7999966526-11">}</span><s[·...·truncated·by·diffoscope;·len:·294,·SHA:·dc9617aceb7dd2fd80b7cd99a62d56811ec20c7ad2ddbf079c22728819084beb·...·]-10">]</span></code></pre><p>If·the·table·type·is·<code·class="inline">set</code>,·the·function·returns·either·the·empty·list·or·a·list1857 </span><span·class="p"·data-group-id="1746273651-10">[</span><span·class="p"·data-group-id="1746273651-11">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="1746273651-11">}</span><s[·...·truncated·by·diffoscope;·len:·294,·SHA:·001942e43e1b72a1707fd8dd5f5d90d6a8fede662968eb8f9cea89992af49cc1·...·]-10">]</span></code></pre><p>If·the·table·type·is·<code·class="inline">set</code>,·the·function·returns·either·the·empty·list·or·a·list
1858 with·one·object,·as·there·cannot·be·more·than·one·object·with·a·given·key.·If1858 with·one·object,·as·there·cannot·be·more·than·one·object·with·a·given·key.·If
1859 the·table·type·is·<code·class="inline">bag</code>·or·<code·class="inline">duplicate_bag</code>,·the·function·returns·a·list·of1859 the·table·type·is·<code·class="inline">bag</code>·or·<code·class="inline">duplicate_bag</code>,·the·function·returns·a·list·of
1860 arbitrary·length.</p><p>Notice·that·the·order·of·objects·returned·is·unspecified.·In·particular,·the1860 arbitrary·length.</p><p>Notice·that·the·order·of·objects·returned·is·unspecified.·In·particular,·the
1861 order·in·which·objects·were·inserted·is·not·reflected.</p>1861 order·in·which·objects·were·inserted·is·not·reflected.</p>
1862 ··</section>1862 ··</section>
1863 </section>1863 </section>
1864 <section·class="detail"·id="match/1">1864 <section·class="detail"·id="match/1">
Offset 2666, 19 lines modifiedOffset 2666, 19 lines modified
2666 by·<code·class="inline">qlc</code>:</p><ul><li>Simple·filters·are·translated·into·equivalent·match·specifications.</li><li>More·complicated·filters·must·be·applied·to·all·objects·returned·by2666 by·<code·class="inline">qlc</code>:</p><ul><li>Simple·filters·are·translated·into·equivalent·match·specifications.</li><li>More·complicated·filters·must·be·applied·to·all·objects·returned·by
2667 <a·href="#select/3"><code·class="inline">select/3</code></a>·given·a·match·specification·that·matches·all2667 <a·href="#select/3"><code·class="inline">select/3</code></a>·given·a·match·specification·that·matches·all
2668 objects.</li></ul></li><li><p><code·class="inline">{select,</code>·<a·href="#t:match_spec/0"><code·class="inline">match_spec/0</code></a>·<code·class="inline">}</code>·-·As·for·<code·class="inline">select</code>,·the·table·is·traversed·by2668 objects.</li></ul></li><li><p><code·class="inline">{select,</code>·<a·href="#t:match_spec/0"><code·class="inline">match_spec/0</code></a>·<code·class="inline">}</code>·-·As·for·<code·class="inline">select</code>,·the·table·is·traversed·by
2669 calling·<a·href="#select/3"><code·class="inline">dets:select/3</code></a>·and·<a·href="#select/1"><code·class="inline">dets:select/1</code></a>.·The·difference·is·that·the·match2669 calling·<a·href="#select/3"><code·class="inline">dets:select/3</code></a>·and·<a·href="#select/1"><code·class="inline">dets:select/1</code></a>.·The·difference·is·that·the·match
2670 specification·is·specified·explicitly.·This·is·how·to·state·match2670 specification·is·specified·explicitly.·This·is·how·to·state·match
2671 specifications·that·cannot·easily·be·expressed·within·the·syntax·provided·by2671 specifications·that·cannot·easily·be·expressed·within·the·syntax·provided·by
2672 <code·class="inline">qlc</code>.</p></li></ul><p>The·following·example·uses·an·explicit·match·specification·to·traverse·the2672 <code·class="inline">qlc</code>.</p></li></ul><p>The·following·example·uses·an·explicit·match·specification·to·traverse·the
2673 table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">open_file</span><span·class="p"·data-group-id="2903463433-1">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2903463433-2">[</span><span·class="p"·data-group-id="2903463433-2">]</span><span·class="p"·data-group-id="2903463433-1">)</span><span·class="p">,</span><span·class="w">2673 table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">open_file</span><span·class="p"·data-group-id="1682278067-1">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1682278067-2">[</span><span·class="p"·data-group-id="1682278067-2">]</span><span·class="p"·data-group-id="1682278067-1">)</span><span·class="p">,</span><span·class="w">
2674 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="2903463433-3">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2903463433-4">[</span><span·class="p"·data-group-id="2903463433-5">{</span><span·class="mi">1</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·778,·SHA:·3a7c62fd06656c2261a88e4f8c0d78be341727d0485d6a29eb9e7b709ee6e83f·...·]-3">)</span><span·class="p">,</span><span·class="w">2674 </span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="1682278067-3">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1682278067-4">[</span><span·class="p"·data-group-id="1682278067-5">{</span><span·class="mi">1</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·778,·SHA:·31d970524296a15d86dfa468c8eb4c35739b4da02cf79ddc3e97944297909552·...·]-3">)</span><span·class="p">,</span><span·class="w">
2675 </span><span·class="n">MS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="2903463433-9">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="2903463433-10">(</span><span·class="p"·data-group-id="2903463433-11">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·994,·SHA:·fb1227bbb644d2301ff866548d085d6c277192d7c8c4c6832f7116a22b044671·...·]-9">)</span><span·class="p">,</span><span·class="w">2675 </span><span·class="n">MS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="1682278067-9">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="1682278067-10">(</span><span·class="p"·data-group-id="1682278067-11">{</span><span·class="n">X</span><span·class="p">,</span><span·class="n">Y</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·994,·SHA:·2ddb7c43e5f98ae239331291740e713e9d742c5c26fa5b580317c87a8c096511·...·]-9">)</span><span·class="p">,</span><span·class="w">
2676 </span><span·class="n">QH1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">table</span><span·class="p"·data-group-id="2903463433-15">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2903463433-16">[</span><span·class="p"·data-group-id="2903463433-17">{</span><span·class="ss">traverse</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·2206,·SHA:·0db30989d0a738af00defd3e41fc3ce1c549544e902b2a841ccf858a685cc79f·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·latter·example·is·equivalent·to·the·former,·which·can·be·verified·using2676 </span><span·class="n">QH1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dets</span><span·class="p">:</span><span·class="nf">table</span><span·class="p"·data-group-id="1682278067-15">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1682278067-16">[</span><span·class="p"·data-group-id="1682278067-17">{</span><span·class="ss">traverse</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·2206,·SHA:·461463290844bbb6ad28645083c7288336ec9a4b1ce4dc675625942cbe6b193b·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·latter·example·is·equivalent·to·the·former,·which·can·be·verified·using
2677 function·<a·href="qlc.html#info/1"><code·class="inline">qlc:info/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">qlc</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="1030496502-1">(</span><span·class="n">QH1</span><span·class="p"·data-group-id="1030496502-1">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="nc">qlc</span><span·class="p">:</span><span·class="nf">info</span><sp[·...·truncated·by·diffoscope;·len:·117,·SHA:·ea6a60b9b3fd3fee9223081ae7c9e7eda371046ecc6c28408c8fec8870cdd47c·...·]-2">)</span><span·class="p">.</span><span·class="w">2677 function·<a·href="qlc.html#info/1"><code·class="inline">qlc:info/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">qlc</span><span·class="p">:</span><span·class="nf">info</span><span·class="p"·data-group-id="1933168551-1">(</span><span·class="n">QH1</span><span·class="p"·data-group-id="1933168551-1">)</span><span·class="w">·</span><span·class="o">=:=</span><span·class="w">·</span><span·class="nc">qlc</span><span·class="p">:</span><span·class="nf">info</span><sp[·...·truncated·by·diffoscope;·len:·117,·SHA:·f3c1d7f5e36122f13d58d8f0ce1ef1c94968059da62871357e1df9ecc9fe25f4·...·]-2">)</span><span·class="p">.</span><span·class="w">
2678 </span><span·class="ss">true</span></code></pre><p><a·href="qlc.html#info/1"><code·class="inline">qlc:info/1</code></a>·returns·information·about·a·query·handle.·In·this·case·identical2678 </span><span·class="ss">true</span></code></pre><p><a·href="qlc.html#info/1"><code·class="inline">qlc:info/1</code></a>·returns·information·about·a·query·handle.·In·this·case·identical
2679 information·is·returned·for·the·two·query·handles.</p>2679 information·is·returned·for·the·two·query·handles.</p>
2680 ··</section>2680 ··</section>
2681 </section>2681 </section>
2682 <section·class="detail"·id="to_ets/2">2682 <section·class="detail"·id="to_ets/2">
  
2683 ··<div·class="detail-header">2683 ··<div·class="detail-header">
Offset 2740, 15 lines modifiedOffset 2740, 15 lines modified
2740 ······················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>2740 ······················Reason·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
2741 ······</div>2741 ······</div>
  
2742 <p>Applies·<code·class="inline">Fun</code>·to·each·object·stored·in·table·<code·class="inline">Name</code>·in·some·unspecified·order.2742 <p>Applies·<code·class="inline">Fun</code>·to·each·object·stored·in·table·<code·class="inline">Name</code>·in·some·unspecified·order.
2743 Different·actions·are·taken·depending·on·the·return·value·of·<code·class="inline">Fun</code>.·The2743 Different·actions·are·taken·depending·on·the·return·value·of·<code·class="inline">Fun</code>.·The
2744 following·<code·class="inline">Fun</code>·return·values·are·allowed:</p><ul><li><p><strong><code·class="inline">continue</code></strong>·-·Continue·to·perform·the·traversal.·For·example,·the·following2744 following·<code·class="inline">Fun</code>·return·values·are·allowed:</p><ul><li><p><strong><code·class="inline">continue</code></strong>·-·Continue·to·perform·the·traversal.·For·example,·the·following
2745 function·can·be·used·to·print·the·contents·of·a·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0265185058-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="0265185058-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><[·...·truncated·by·diffoscope;·len:·381,·SHA:·07fb27b62bf8019eeeaf102bc401dc2c101cc1616b807e9d6b03a4b2520ed3a0·...·]-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span></code></pre></li><li><p><strong><code·class="inline">{continue,·Val}</code></strong>·-·Continue·the·traversal·and·accumulate·<code·class="inline">Val</code>.·The2745 function·can·be·used·to·print·the·contents·of·a·table:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="6481378806-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="6481378806-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><[·...·truncated·by·diffoscope;·len:·381,·SHA:·e806ef956eb191481e8f55550d246f17fdb011fc53e0555291e89dfbf87f99f0·...·]-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">continue</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span></code></pre></li><li><p><strong><code·class="inline">{continue,·Val}</code></strong>·-·Continue·the·traversal·and·accumulate·<code·class="inline">Val</code>.·The
2746 following·function·is·supplied·to·collect·all·objects·of·a·table·in·a·list:</p><pre><code·class="text">fun(X)·-&gt;·{continue,·X}·end.</code></pre></li><li><p><strong><code·class="inline">{done,·Value}</code></strong>·-·Terminate·the·traversal·and·return·<code·class="inline">[Value·|·Acc]</code>.</p></li></ul><p>Any·other·value·<code·class="inline">OtherValue</code>·returned·by·<code·class="inline">Fun</code>·terminates·the·traversal·and·is2746 following·function·is·supplied·to·collect·all·objects·of·a·table·in·a·list:</p><pre><code·class="text">fun(X)·-&gt;·{continue,·X}·end.</code></pre></li><li><p><strong><code·class="inline">{done,·Value}</code></strong>·-·Terminate·the·traversal·and·return·<code·class="inline">[Value·|·Acc]</code>.</p></li></ul><p>Any·other·value·<code·class="inline">OtherValue</code>·returned·by·<code·class="inline">Fun</code>·terminates·the·traversal·and·is
2747 returned·immediately.</p>2747 returned·immediately.</p>
2748 ··</section>2748 ··</section>
2749 </section>2749 </section>
2750 <section·class="detail"·id="update_counter/3">2750 <section·class="detail"·id="update_counter/3">
  
2751 ··<div·class="detail-header">2751 ··<div·class="detail-header">
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2809 ······<p·class="built-using">2809 ······<p·class="built-using">
2810 ········Built·using2810 ········Built·using
2811 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2811 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2812 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2812 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2813 ······</p>2813 ······</p>
2814 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2814 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2815 ····</footer>2815 ····</footer>
2816 ··</div>2816 ··</div>
2817 </main>2817 </main>
2818 </div>2818 </div>
2819 <script>2819 <script>
2820 ··function·mermaidLoaded()·{2820 ··function·mermaidLoaded()·{
2821 ····mermaid.initialize({2821 ····mermaid.initialize({
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134 do·not·compare·equal·(<code·class="inline">==</code>).</p><h2·id="module-notes"·class="section-heading">134 do·not·compare·equal·(<code·class="inline">==</code>).</p><h2·id="module-notes"·class="section-heading">
135 ··<a·href="#module-notes"·class="hover-link">135 ··<a·href="#module-notes"·class="hover-link">
136 ····<i·class="ri-link-m"·aria-hidden="true"></i>136 ····<i·class="ri-link-m"·aria-hidden="true"></i>
137 ··</a>137 ··</a>
138 ··<span·class="text">Notes</span>138 ··<span·class="text">Notes</span>
139 </h2>139 </h2>
140 <p><a·href=""·id="notes"></a></p><p>Functions·<code·class="inline">append</code>·and·<code·class="inline">append_list</code>·are·included·so·that·keyed·values·can·be140 <p><a·href=""·id="notes"></a></p><p>Functions·<code·class="inline">append</code>·and·<code·class="inline">append_list</code>·are·included·so·that·keyed·values·can·be
141 stored·in·a·list·<em>accumulator</em>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">D0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="5264209468-1">(</span><span·class="p"·data-group-id="5264209468-1">)</span><span·class="p">,</span><span·class="w">141 stored·in·a·list·<em>accumulator</em>,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">D0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="1732170322-1">(</span><span·class="p"·data-group-id="1732170322-1">)</span><span·class="p">,</span><span·class="w">
142 ··</span><span·class="n">D1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">store</span><span·class="p"·data-group-id="5264209468-2">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5264209468-3">[</span><span·class="p"·data-group-id="5264209468-3">]</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·63,·SHA:·d4e33693765fc4139c2d8b23d68d87dca981e4a983f8e4eb6cb418fb4de112b0·...·]-2">)</span><span·class="p">,</span><span·class="w">142 ··</span><span·class="n">D1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">store</span><span·class="p"·data-group-id="1732170322-2">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1732170322-3">[</span><span·class="p"·data-group-id="1732170322-3">]</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·63,·SHA:·e9c0a02917f7d1f15fa17886ee9866538da9993c3bf9b087bf87030b6c140616·...·]-2">)</span><span·class="p">,</span><span·class="w">
143 ··</span><span·class="n">D2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5264209468-4">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p"·data-group-id="5264209468-4">)</span><span·class="p">,</span><span·class="w">143 ··</span><span·class="n">D2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="1732170322-4">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p"·data-group-id="1732170322-4">)</span><span·class="p">,</span><span·class="w">
144 ··</span><span·class="n">D3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5264209468-5">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p"·data-group-id="5264209468-5">)</span><span·class="p">,</span><span·class="w">144 ··</span><span·class="n">D3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="1732170322-5">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p"·data-group-id="1732170322-5">)</span><span·class="p">,</span><span·class="w">
145 ··</span><span·class="n">D4</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5264209468-6">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D3</span><span·class="p"·data-group-id="5264209468-6">)</span><span·class="p">,</span><span·class="w">145 ··</span><span·class="n">D4</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="1732170322-6">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D3</span><span·class="p"·data-group-id="1732170322-6">)</span><span·class="p">,</span><span·class="w">
146 ··</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="5264209468-7">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D4</span><span·class="p"·data-group-id="5264209468-7">)</span><span·class="p">.</span><span·class="w">146 ··</span><span·class="nc">dict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="1732170322-7">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D4</span><span·class="p"·data-group-id="1732170322-7">)</span><span·class="p">.</span><span·class="w">
147 </span><span·class="p"·data-group-id="5264209468-8">[</span><span·class="ss">f1</span><span·class="p">,</span><span·class="ss">f2</span><span·class="p">,</span><span·class="ss">f3</span><span·class="p"·data-group-id="5264209468-8">]</span></code></pre><p>This·saves·the·trouble·of·first·fetching·a·keyed·value,·appending·a·new·value·to147 </span><span·class="p"·data-group-id="1732170322-8">[</span><span·class="ss">f1</span><span·class="p">,</span><span·class="ss">f2</span><span·class="p">,</span><span·class="ss">f3</span><span·class="p"·data-group-id="1732170322-8">]</span></code></pre><p>This·saves·the·trouble·of·first·fetching·a·keyed·value,·appending·a·new·value·to
148 the·list·of·stored·values,·and·storing·the·result.</p><p>Function·<code·class="inline">fetch</code>·is·to·be·used·if·the·key·is·known·to·be·in·the·dictionary,148 the·list·of·stored·values,·and·storing·the·result.</p><p>Function·<code·class="inline">fetch</code>·is·to·be·used·if·the·key·is·known·to·be·in·the·dictionary,
149 otherwise·function·<code·class="inline">find</code>.</p><h2·id="module-see-also"·class="section-heading">149 otherwise·function·<code·class="inline">find</code>.</p><h2·id="module-see-also"·class="section-heading">
150 ··<a·href="#module-see-also"·class="hover-link">150 ··<a·href="#module-see-also"·class="hover-link">
151 ····<i·class="ri-link-m"·aria-hidden="true"></i>151 ····<i·class="ri-link-m"·aria-hidden="true"></i>
152 ··</a>152 ··</a>
153 ··<span·class="text">See·Also</span>153 ··<span·class="text">See·Also</span>
154 </h2>154 </h2>
Offset 871, 18 lines modifiedOffset 871, 18 lines modified
  
871 ······</div>871 ······</div>
  
872 <p>Merges·two·dictionaries,·<code·class="inline">Dict1</code>·and·<code·class="inline">Dict2</code>,·to·create·a·new·dictionary.·All872 <p>Merges·two·dictionaries,·<code·class="inline">Dict1</code>·and·<code·class="inline">Dict2</code>,·to·create·a·new·dictionary.·All
873 the·<code·class="inline">Key</code>-<code·class="inline">Value</code>·pairs·from·both·dictionaries·are·included·in·the·new873 the·<code·class="inline">Key</code>-<code·class="inline">Value</code>·pairs·from·both·dictionaries·are·included·in·the·new
874 dictionary.·If·a·key·occurs·in·both·dictionaries,·<code·class="inline">Fun</code>·is·called·with·the·key874 dictionary.·If·a·key·occurs·in·both·dictionaries,·<code·class="inline">Fun</code>·is·called·with·the·key
875 and·both·values·to·return·a·new·value.·<code·class="inline">merge</code>·can·be·defined·as·follows,·but·is875 and·both·values·to·return·a·new·value.·<code·class="inline">merge</code>·can·be·defined·as·follows,·but·is
876 faster:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">merge</span><span·class="p"·data-group-id="1554843937-1">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p"·data-group-id="1554843937-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">876 faster:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">merge</span><span·class="p"·data-group-id="1383128190-1">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p"·data-group-id="1383128190-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
877 ····</span><span·class="nf">fold</span><span·class="p"·data-group-id="1554843937-2">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1554843937-3">(</span><span·class="n">K</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V1</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·79,·SHA:·cd6df1a5ea71d3d68d940b2d8f39f549aca5d04b93e6272cea9576ff0972bff2·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">877 ····</span><span·class="nf">fold</span><span·class="p"·data-group-id="1383128190-2">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1383128190-3">(</span><span·class="n">K</span><span·class="p">,</span><span·class="w">·</span><span·class="n">V1</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·79,·SHA:·223ce8b92e08f9b7a8eecc7f7ba38bee01d5b5b5021d8301834f8f2c58b6dee1·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
878 ·················</span><span·class="nf">update</span><span·class="p"·data-group-id="1554843937-4">(</span><span·class="n">K</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1554843937-5">(</span><span·class="n">V2</span><span·class="p"·data-group-id="155[·...·truncated·by·diffoscope;·len:·633,·SHA:·1d319ffa289459206e7b4925c14de0f1fac10d75588b8728aa607fb8b30829fa·...·]-4">)</span><span·class="w">878 ·················</span><span·class="nf">update</span><span·class="p"·data-group-id="1383128190-4">(</span><span·class="n">K</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1383128190-5">(</span><span·class="n">V2</span><span·class="p"·data-group-id="138[·...·truncated·by·diffoscope;·len:·633,·SHA:·032cab3dfe3a3ea328c75087246130251181481480c99d4e7a4365201275225f·...·]-4">)</span><span·class="w">
879 ·········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p"·data-group-id="1554843937-2">)</span><span·class="p">.</span></code></pre>879 ·········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p"·data-group-id="1383128190-2">)</span><span·class="p">.</span></code></pre>
880 ··</section>880 ··</section>
881 </section>881 </section>
882 <section·class="detail"·id="new/0">882 <section·class="detail"·id="new/0">
  
883 ··<div·class="detail-header">883 ··<div·class="detail-header">
884 ····<a·href="#new/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">884 ····<a·href="#new/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
885 ······<i·class="ri-link-m"·aria-hidden="true"></i>885 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1073, 16 lines modifiedOffset 1073, 16 lines modified
1073 ····················Fun·::·fun((Value1·::·Value)·->·Value2·::·Value),1073 ····················Fun·::·fun((Value1·::·Value)·->·Value2·::·Value),
1074 ····················Initial·::·Value.</pre>1074 ····················Initial·::·Value.</pre>
  
1075 ······</div>1075 ······</div>
  
1076 <p>Updates·a·value·in·a·dictionary·by·calling·<code·class="inline">Fun</code>·on·the·value·to·get·a·new1076 <p>Updates·a·value·in·a·dictionary·by·calling·<code·class="inline">Fun</code>·on·the·value·to·get·a·new
1077 value.·If·<code·class="inline">Key</code>·is·not·present·in·the·dictionary,·<code·class="inline">Initial</code>·is·stored·as·the1077 value.·If·<code·class="inline">Key</code>·is·not·present·in·the·dictionary,·<code·class="inline">Initial</code>·is·stored·as·the
1078 first·value.·For·example,·<a·href="#append/3"><code·class="inline">append/3</code></a>·can·be·defined·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append</span><span·class="p"·data-group-id="5533385172-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D</span><span·class="p"·data-group-id="5533385172-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1078 first·value.·For·example,·<a·href="#append/3"><code·class="inline">append/3</code></a>·can·be·defined·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append</span><span·class="p"·data-group-id="9085376484-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Val</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D</span><span·class="p"·data-group-id="9085376484-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1079 ····</span><span·class="nf">update</span><span·class="p"·data-group-id="5533385172-2">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5533385172-3">(</span><span·class="n">Old</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·673,·SHA:·42a9cd695b67d05030a6d96170f2e36f7860b9d494f731b01bfd0fa8de2642d3·...·]-2">)</span><span·class="p">.</span></code></pre>1079 ····</span><span·class="nf">update</span><span·class="p"·data-group-id="9085376484-2">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9085376484-3">(</span><span·class="n">Old</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·673,·SHA:·0a9560d672e3e1ad049d3d738031b6719a3ac54928ce11333fb25dfe400d0db9·...·]-2">)</span><span·class="p">.</span></code></pre>
1080 ··</section>1080 ··</section>
1081 </section>1081 </section>
1082 <section·class="detail"·id="update_counter/3">1082 <section·class="detail"·id="update_counter/3">
  
1083 ··<div·class="detail-header">1083 ··<div·class="detail-header">
1084 ····<a·href="#update_counter/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1084 ····<a·href="#update_counter/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1085 ······<i·class="ri-link-m"·aria-hidden="true"></i>1085 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1103, 16 lines modifiedOffset 1103, 16 lines modified
1103 ··········<pre·translate="no"><span·class="attribute">-spec</span>·update_counter(Key,·Increment,·Dict1)·->·Dict21103 ··········<pre·translate="no"><span·class="attribute">-spec</span>·update_counter(Key,·Increment,·Dict1)·->·Dict2
1104 ························when·Dict1·::·<a·href="#t:dict/2">dict</a>(Key,·Value),·Dict2·::·<a·href="#t:dict/2">dict</a>(Key,·Value),·Increment·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:number/0">number</a>().</pre>1104 ························when·Dict1·::·<a·href="#t:dict/2">dict</a>(Key,·Value),·Dict2·::·<a·href="#t:dict/2">dict</a>(Key,·Value),·Increment·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:number/0">number</a>().</pre>
  
1105 ······</div>1105 ······</div>
  
1106 <p>Adds·<code·class="inline">Increment</code>·to·the·value·associated·with·<code·class="inline">Key</code>·and·stores·this·value.·If1106 <p>Adds·<code·class="inline">Increment</code>·to·the·value·associated·with·<code·class="inline">Key</code>·and·stores·this·value.·If
1107 <code·class="inline">Key</code>·is·not·present·in·the·dictionary,·<code·class="inline">Increment</code>·is·stored·as·the·first1107 <code·class="inline">Key</code>·is·not·present·in·the·dictionary,·<code·class="inline">Increment</code>·is·stored·as·the·first
1108 value.</p><p>This·can·be·defined·as·follows,·but·is·faster:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">update_counter</span><span·class="p"·data-group-id="2151484352-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Incr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D</span><span·class="p"·data-group-id="2151484352-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1108 value.</p><p>This·can·be·defined·as·follows,·but·is·faster:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">update_counter</span><span·class="p"·data-group-id="9780852205-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Incr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D</span><span·class="p"·data-group-id="9780852205-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1109 ····</span><span·class="nf">update</span><span·class="p"·data-group-id="2151484352-2">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="2151484352-3">(</span><span·class="n">Old</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·462,·SHA:·baf7b95ecb6d600a7b12c46817f81482bda07f97b5d0e210cb96b867425e79c6·...·]-2">)</span><span·class="p">.</span></code></pre>1109 ····</span><span·class="nf">update</span><span·class="p"·data-group-id="9780852205-2">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9780852205-3">(</span><span·class="n">Old</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·462,·SHA:·f178106376fc02f5e2ac2056f2ec8f486511dc74dcda9aa9540d55558e445d15·...·]-2">)</span><span·class="p">.</span></code></pre>
1110 ··</section>1110 ··</section>
1111 </section>1111 </section>
  
1112 ····</div>1112 ····</div>
1113 ··</section>1113 ··</section>
  
1114 ····<footer·class="footer">1114 ····<footer·class="footer">
Offset 1133, 15 lines modifiedOffset 1133, 15 lines modified
1133 ······<p·class="built-using">1133 ······<p·class="built-using">
1134 ········Built·using1134 ········Built·using
1135 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1135 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1136 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1136 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1137 ······</p>1137 ······</p>
1138 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1138 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1139 ····</footer>1139 ····</footer>
1140 ··</div>1140 ··</div>
1141 </main>1141 </main>
1142 </div>1142 </div>
1143 <script>1143 <script>
1144 ··function·mermaidLoaded()·{1144 ··function·mermaidLoaded()·{
1145 ····mermaid.initialize({1145 ····mermaid.initialize({
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1760 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1760 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
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1762 ······</p>1762 ······</p>
1763 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1763 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1764 ····</footer>1764 ····</footer>
1765 ··</div>1765 ··</div>
1766 </main>1766 </main>
1767 </div>1767 </div>
1768 <script>1768 <script>
1769 ··function·mermaidLoaded()·{1769 ··function·mermaidLoaded()·{
1770 ····mermaid.initialize({1770 ····mermaid.initialize({
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1008 ······</p>1008 ······</p>
1009 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1009 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1010 ····</footer>1010 ····</footer>
1011 ··</div>1011 ··</div>
1012 </main>1012 </main>
1013 </div>1013 </div>
1014 <script>1014 <script>
1015 ··function·mermaidLoaded()·{1015 ··function·mermaidLoaded()·{
1016 ····mermaid.initialize({1016 ····mermaid.initialize({
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340 ······</p>340 ······</p>
341 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>341 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
342 ····</footer>342 ····</footer>
343 ··</div>343 ··</div>
344 </main>344 </main>
345 </div>345 </div>
346 <script>346 <script>
347 ··function·mermaidLoaded()·{347 ··function·mermaidLoaded()·{
348 ····mermaid.initialize({348 ····mermaid.initialize({
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329 ········Built·using329 ········Built·using
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332 ······</p>332 ······</p>
333 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>333 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
334 ····</footer>334 ····</footer>
335 ··</div>335 ··</div>
336 </main>336 </main>
337 </div>337 </div>
338 <script>338 <script>
339 ··function·mermaidLoaded()·{339 ··function·mermaidLoaded()·{
340 ····mermaid.initialize({340 ····mermaid.initialize({
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136 <code·class="inline">Latin-1</code>·and·<code·class="inline">UTF-8</code>,·where·the·case·of·the·characters·can·be·chosen·freely.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·coding:·utf-8</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·For·this·file·we·have·chosen·encoding·=·Latin-1</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·-*-·coding:·latin-1·-*-</span></code></pre><h2·id="module-error-information"·class="section-heading">136 <code·class="inline">Latin-1</code>·and·<code·class="inline">UTF-8</code>,·where·the·case·of·the·characters·can·be·chosen·freely.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·coding:·utf-8</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·For·this·file·we·have·chosen·encoding·=·Latin-1</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·-*-·coding:·latin-1·-*-</span></code></pre><h2·id="module-error-information"·class="section-heading">
137 ··<a·href="#module-error-information"·class="hover-link">137 ··<a·href="#module-error-information"·class="hover-link">
138 ····<i·class="ri-link-m"·aria-hidden="true"></i>138 ····<i·class="ri-link-m"·aria-hidden="true"></i>
139 ··</a>139 ··</a>
140 ··<span·class="text">Error·Information</span>140 ··<span·class="text">Error·Information</span>
141 </h2>141 </h2>
142 <p><code·class="inline">ErrorInfo</code>·is·the·standard·<code·class="inline">ErrorInfo</code>·structure·that·is·returned·from·all·I/O142 <p><code·class="inline">ErrorInfo</code>·is·the·standard·<code·class="inline">ErrorInfo</code>·structure·that·is·returned·from·all·I/O
143 modules.·The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4140966334-1">{</span><span·class="n">ErrorLine</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="41409663[·...·truncated·by·diffoscope;·len:·367,·SHA:·9f00c64cdc42446dc7046964ba2ba41284e9c88636794ad7e001ef886211c12c·...·]78-1">)</span></code></pre><h2·id="module-see-also"·class="section-heading">143 modules.·The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9907322199-1">{</span><span·class="n">ErrorLine</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="99073221[·...·truncated·by·diffoscope;·len:·367,·SHA:·51711a637fdc9984fd1696f87f2ae496566f78477cc6dc1c6099b6b0603fd002·...·]78-1">)</span></code></pre><h2·id="module-see-also"·class="section-heading">
144 ··<a·href="#module-see-also"·class="hover-link">144 ··<a·href="#module-see-also"·class="hover-link">
145 ····<i·class="ri-link-m"·aria-hidden="true"></i>145 ····<i·class="ri-link-m"·aria-hidden="true"></i>
146 ··</a>146 ··</a>
147 ··<span·class="text">See·Also</span>147 ··<span·class="text">See·Also</span>
148 </h2>148 </h2>
149 <p><a·href="erl_parse.html"><code·class="inline">erl_parse</code></a></p>149 <p><a·href="erl_parse.html"><code·class="inline">erl_parse</code></a></p>
150 ····</section>150 ····</section>
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1186 ········Built·using1186 ········Built·using
1187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1189 ······</p>1189 ······</p>
1190 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1190 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1191 ····</footer>1191 ····</footer>
1192 ··</div>1192 ··</div>
1193 </main>1193 </main>
1194 </div>1194 </div>
1195 <script>1195 <script>
1196 ··function·mermaidLoaded()·{1196 ··function·mermaidLoaded()·{
1197 ····mermaid.initialize({1197 ····mermaid.initialize({
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1215 ······</p>1215 ······</p>
1216 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1216 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1217 ····</footer>1217 ····</footer>
1218 ··</div>1218 ··</div>
1219 </main>1219 </main>
1220 </div>1220 </div>
1221 <script>1221 <script>
1222 ··function·mermaidLoaded()·{1222 ··function·mermaidLoaded()·{
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309 ······<div·class="specs">309 ······<div·class="specs">
  
310 ··········<pre·translate="no"><span·class="attribute">-type</span>·format_fun()·::·fun((<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·<a·href="#t:column/0">column</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:iolist/0">iolist</a>()).</pre>310 ··········<pre·translate="no"><span·class="attribute">-type</span>·format_fun()·::·fun((<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·<a·href="#t:column/0">column</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:iolist/0">iolist</a>()).</pre>
  
311 ······</div>311 ······</div>
  
312 <p>A·fun·used·to·format·function·arguments·for·BIF·and·function·calls.·By·default312 <p>A·fun·used·to·format·function·arguments·for·BIF·and·function·calls.·By·default
313 the·following·fun·will·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0703227776-1">(</span><span·class="n">Term</span><span·class="p">,</span><span·class="w">·</span><span·class="n">I</span><span·class="p"·data-group-id="0703227776-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·418,·SHA:·b11b445a82e3b9c6d018c7d6f902dbb14f70f628daf893c9944fc6dc7a200579·...·]-2">)</span><span·class="w">·</span><span·class="k">end</span></code></pre>313 the·following·fun·will·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="3833796580-1">(</span><span·class="n">Term</span><span·class="p">,</span><span·class="w">·</span><span·class="n">I</span><span·class="p"·data-group-id="3833796580-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·418,·SHA:·d9ec2e234c9cccd8b63a8f2c20f403ca59a75e591f54cdc9f5b20627d420f740·...·]-2">)</span><span·class="w">·</span><span·class="k">end</span></code></pre>
314 ··</section>314 ··</section>
315 </section>315 </section>
316 <section·class="detail"·id="t:format_options/0">316 <section·class="detail"·id="t:format_options/0">
  
317 ··<div·class="detail-header">317 ··<div·class="detail-header">
318 ····<a·href="#t:format_options/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">318 ····<a·href="#t:format_options/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·type">
319 ······<i·class="ri-link-m"·aria-hidden="true"></i>319 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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424 <p>This·callback·is·called·when·<a·href="#format_exception/4"><code·class="inline">format_exception/4</code></a>·or·similar·functionality·wants424 <p>This·callback·is·called·when·<a·href="#format_exception/4"><code·class="inline">format_exception/4</code></a>·or·similar·functionality·wants
425 to·provide·extra·information·about·an·error.·The·<code·class="inline">Module</code>:<code·class="inline">Function</code>·called·is425 to·provide·extra·information·about·an·error.·The·<code·class="inline">Module</code>:<code·class="inline">Function</code>·called·is
426 the·one·specificed·by·the·<code·class="inline">error_info</code>·map.</p><p>The·function·should·return·a·map·with·additional·information·about·what·have426 the·one·specificed·by·the·<code·class="inline">error_info</code>·map.</p><p>The·function·should·return·a·map·with·additional·information·about·what·have
427 caused·the·exception.·The·possible·keys·of·the·map·are:</p><ul><li><p><strong><code·class="inline">ArgumentPosition·=·pos_integer()</code></strong>·-·The·position·of·the·argument·that427 caused·the·exception.·The·possible·keys·of·the·map·are:</p><ul><li><p><strong><code·class="inline">ArgumentPosition·=·pos_integer()</code></strong>·-·The·position·of·the·argument·that
428 caused·the·error·starting·at·1.</p></li><li><p><strong><code·class="inline">general</code></strong>·-·An·error·that·is·not·associated·with·any·argument·caused·the428 caused·the·error·starting·at·1.</p></li><li><p><strong><code·class="inline">general</code></strong>·-·An·error·that·is·not·associated·with·any·argument·caused·the
429 error.</p></li><li><p><strong><code·class="inline">reason</code></strong>·-·If·the·<code·class="inline">Reason</code>·should·be·printed·differently·than·the·default429 error.</p></li><li><p><strong><code·class="inline">reason</code></strong>·-·If·the·<code·class="inline">Reason</code>·should·be·printed·differently·than·the·default
430 way.</p></li></ul><p>If·the·text·returned·includes·new-lines,·<a·href="#format_exception/4"><code·class="inline">format_exception/4</code></a>·will·indent·the430 way.</p></li></ul><p>If·the·text·returned·includes·new-lines,·<a·href="#format_exception/4"><code·class="inline">format_exception/4</code></a>·will·indent·the
431 text·correctly.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9082205859-1">(</span><span·class="ss">my_error_module</span><span·class="p"·data-group-id="9082205859-1">)</span><span·class="p">.</span><span·class="w">431 text·correctly.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5244225222-1">(</span><span·class="ss">my_error_module</span><span·class="p"·data-group-id="5244225222-1">)</span><span·class="p">.</span><span·class="w">
432 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9082205859-2">(</span><span·class="p"·data-group-id="9082205859-3">[</span><span·class="ss">atom_to_string</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">format_error</span><span·clas[·...·truncated·by·diffoscope;·len:·133,·SHA:·2db60ecfbd402cb6ffa86d05df13bdcb9e60ab225c2a6f84be9de7276d7f9203·...·]-2">)</span><span·class="p">.</span><span·class="w">432 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5244225222-2">(</span><span·class="p"·data-group-id="5244225222-3">[</span><span·class="ss">atom_to_string</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">format_error</span><span·clas[·...·truncated·by·diffoscope;·len:·133,·SHA:·cbdf4c5c9b98b8c5722e986c65c01970b4ab9093021f941f08e8619545d21222·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
433 </span><span·class="nf">atom_to_string</span><span·class="p"·data-group-id="9082205859-4">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="9082205859-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_atom</span><span·class="p"·data-group-id="9082205859-5">(</s[·...·truncated·by·diffoscope;·len:·71,·SHA:·4b84d77f147ddeb84512c0520ca6c4f0d853c0854793d1f7014561f18315748c·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">433 </span><span·class="nf">atom_to_string</span><span·class="p"·data-group-id="5244225222-4">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="5244225222-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_atom</span><span·class="p"·data-group-id="5244225222-5">(</s[·...·truncated·by·diffoscope;·len:·71,·SHA:·a7c434526e30cfe16fad93887cdab912557e97a3c73fffaf24b770492052622b·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
434 ··</span><span·class="nf">atom_to_list</span><span·class="p"·data-group-id="9082205859-6">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="9082205859-6">)</span><span·class="p">;</span><span·class="w">434 ··</span><span·class="nf">atom_to_list</span><span·class="p"·data-group-id="5244225222-6">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="5244225222-6">)</span><span·class="p">;</span><span·class="w">
435 </span><span·class="nf">atom_to_string</span><span·class="p"·data-group-id="9082205859-7">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="9082205859-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">435 </span><span·class="nf">atom_to_string</span><span·class="p"·data-group-id="5244225222-7">(</span><span·class="n">Arg</span><span·class="p"·data-group-id="5244225222-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
436 ··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="9082205859-8">(</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p"·data-group-id="9082205859-9">[</span><span·class="n">Arg</span><span·class="p"·data-group-id="9082205859-9">]</span><span·class="p">,</span><span·class="w">436 ··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">error</span><span·class="p"·data-group-id="5244225222-8">(</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p"·data-group-id="5244225222-9">[</span><span·class="n">Arg</span><span·class="p"·data-group-id="5244225222-9">]</span><span·class="p">,</span><span·class="w">
437 ···············</span><span·class="p"·data-group-id="9082205859-10">[</span><span·class="p"·data-group-id="9082205859-11">{</span><span·class="ss">error_info</span><span·class="p">,</span><span·class="p"·data-group-id="9082205859-12">#{</span><span·class="w">·</span><span·class="ss">module</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">437 ···············</span><span·class="p"·data-group-id="5244225222-10">[</span><span·class="p"·data-group-id="5244225222-11">{</span><span·class="ss">error_info</span><span·class="p">,</span><span·class="p"·data-group-id="5244225222-12">#{</span><span·class="w">·</span><span·class="ss">module</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">
438 ·······························</span><span·class="ss">cause</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9082205859-13">#{</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;should·be·an·atom&quot;</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·226,·SHA:·a080b6db5ac89808a85bfbb6b7bc207f6683aa421e61d3bab002481cff276092·...·]-8">)</span><span·class="p">.</span><span·class="w">438 ·······························</span><span·class="ss">cause</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5244225222-13">#{</span><span·class="w">·</span><span·class="mi">1</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;should·be·an·atom&quot;</span><span·class="w">·</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·226,·SHA:·657f535542a65f263e1a84f9d9e658c7bdb411c0b761840bed8c37dfc08273fc·...·]-8">)</span><span·class="p">.</span><span·class="w">
  
439 </span><span·class="nf">format_error</span><span·class="p"·data-group-id="9082205859-14">(</span><span·class="n">Reason</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9082205859-15">[</span><span·class="p"·data-group-id="9082205859-16">{</span><span·class="p">_</span><span·class="n">M</span>[·...·truncated·by·diffoscope;·len:·393,·SHA:·fa4e39ee123bf44a66b4d46a95dfbe3f00b8e8da6e17524b90bef4442b1aa808·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">439 </span><span·class="nf">format_error</span><span·class="p"·data-group-id="5244225222-14">(</span><span·class="n">Reason</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5244225222-15">[</span><span·class="p"·data-group-id="5244225222-16">{</span><span·class="p">_</span><span·class="n">M</span>[·...·truncated·by·diffoscope;·len:·393,·SHA:·e9bf884f3883c2c45c940b1f0944705300ce99d0ac1058a699ee9bf33edd4924·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
440 ··</span><span·class="n">ErrorInfo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9082205859-17">(</span><span·class="ss">error_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9082205859-18">#{</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·74,·SHA:·de63898dfca940059d45e05d5a4dc2d7c0f064477b6da2d49a1f0069d4f0def8·...·]-17">)</span><span·class="p">,</span><span·class="w">440 ··</span><span·class="n">ErrorInfo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="5244225222-17">(</span><span·class="ss">error_info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5244225222-18">#{</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·74,·SHA:·4aaf596b392381a9f613940cd598f4496d29847292ff3a90f9182a8858d88cb0·...·]-17">)</span><span·class="p">,</span><span·class="w">
441 ··</span><span·class="n">ErrorMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="9082205859-19">(</span><span·class="ss">cause</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorInfo</span><span·class="p"·data-group-id="9082205859-19">)</span><span·class="p">,</span><span·class="w">441 ··</span><span·class="n">ErrorMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">get</span><span·class="p"·data-group-id="5244225222-19">(</span><span·class="ss">cause</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorInfo</span><span·class="p"·data-group-id="5244225222-19">)</span><span·class="p">,</span><span·class="w">
442 ··</span><span·class="n">ErrorMap</span><span·class="p"·data-group-id="9082205859-20">#{</span><span·class="w">·</span><span·class="ss">general</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;optional·general·information&quot;</span><span·class="p">,</span><span·class="w">442 ··</span><span·class="n">ErrorMap</span><span·class="p"·data-group-id="5244225222-20">#{</span><span·class="w">·</span><span·class="ss">general</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;optional·general·information&quot;</span><span·class="p">,</span><span·class="w">
443 ·············</span><span·class="ss">reason</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9082205859-21">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">:·</span><span·class="si">~p</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="9082205859-22">[</span><span·class="o">?</s[·...·truncated·by·diffoscope;·len:·582,·SHA:·f22325c8a07031c4ac6d63418697a32e100c17a85f96a643aefe166a140c670e·...·]-1">)</span><span·class="p">.</span><span·class="w">443 ·············</span><span·class="ss">reason</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5244225222-21">(</span><span·class="s">&quot;</span><span·class="si">~p</span><span·class="s">:·</span><span·class="si">~p</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="5244225222-22">[</span><span·class="o">?</s[·...·truncated·by·diffoscope;·len:·582,·SHA:·9e6c4caa164932f72a2559cf62906ae2a2b68cf5936ea0cad880fbac79d0184c·...·]-1">)</span><span·class="p">.</span><span·class="w">
444 </span><span·class="p"·data-group-id="4468966021-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">my_error_module</span><span·class="p"·data-group-id="4468966021-2">}</span><span·class="gp·unselectable">444 </span><span·class="p"·data-group-id="0143150033-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">my_error_module</span><span·class="p"·data-group-id="0143150033-2">}</span><span·class="gp·unselectable">
445 2&gt;·</span><span·class="nc">my_error_module</span><span·class="p">:</span><span·class="nf">atom_to_string</span><span·class="p"·data-group-id="4468966021-3">(</span><span·class="mi">1</span><span·class="p"·data-group-id="4468966021-3">)</span><span·class="p">.</span><span·class="w">445 2&gt;·</span><span·class="nc">my_error_module</span><span·class="p">:</span><span·class="nf">atom_to_string</span><span·class="p"·data-group-id="0143150033-3">(</span><span·class="mi">1</span><span·class="p"·data-group-id="0143150033-3">)</span><span·class="p">.</span><span·class="w">
446 </span><span·class="gt">**·exception·error:·my_error_module:·badarg446 </span><span·class="gt">**·exception·error:·my_error_module:·badarg
447 ·····in·function··my_error_module:atom_to_string/1447 ·····in·function··my_error_module:atom_to_string/1
448 ········called·as·my_error_module:atom_to_string(1)448 ········called·as·my_error_module:atom_to_string(1)
449 ········***·argument·1:·should·be·an·atom449 ········***·argument·1:·should·be·an·atom
450 ········***·optional·general·information</span></code></pre>450 ········***·optional·general·information</span></code></pre>
451 ··</section>451 ··</section>
452 </section>452 </section>
Offset 524, 26 lines modifiedOffset 524, 26 lines modified
524 ······························StackTrace·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:stacktrace/0">erlang:stacktrace</a>(),524 ······························StackTrace·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:stacktrace/0">erlang:stacktrace</a>(),
525 ······························Options·::·<a·href="#t:format_options/0">format_options</a>().</pre>525 ······························Options·::·<a·href="#t:format_options/0">format_options</a>().</pre>
  
526 ······</div>526 ······</div>
  
527 <p>Format·the·error·reason·and·stack·back-trace·caught·using·<code·class="inline">try</code>·...·<code·class="inline">catch</code>·in527 <p>Format·the·error·reason·and·stack·back-trace·caught·using·<code·class="inline">try</code>·...·<code·class="inline">catch</code>·in
528 the·same·style·as·the·shell·formats·them.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">try</span><span·class="w">528 the·same·style·as·the·shell·formats·them.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">try</span><span·class="w">
529 ····</span><span·class="nf">do_something</span><span·class="p"·data-group-id="1584262473-1">(</span><span·class="p"·data-group-id="1584262473-1">)</span><span·class="w">529 ····</span><span·class="nf">do_something</span><span·class="p"·data-group-id="7752879291-1">(</span><span·class="p"·data-group-id="7752879291-1">)</span><span·class="w">
530 </span><span·class="k">catch</span><span·class="w">530 </span><span·class="k">catch</span><span·class="w">
531 ····</span><span·class="n">C</span><span·class="p">:</span><span·class="n">R</span><span·class="p">:</span><span·class="n">Stk</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">531 ····</span><span·class="n">C</span><span·class="p">:</span><span·class="n">R</span><span·class="p">:</span><span·class="n">Stk</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
532 ········</span><span·class="n">Message</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_error</span><span·class="p">:</span><span·class="nf">format_exception</span><span·class="p"·data-group-id="1584262473-2">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Stk</span><span·class="p"·data-group-id="1584262473-2">)</span><span·class="p">,</span><span·class="w">532 ········</span><span·class="n">Message</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_error</span><span·class="p">:</span><span·class="nf">format_exception</span><span·class="p"·data-group-id="7752879291-2">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Stk</span><span·class="p"·data-group-id="7752879291-2">)</span><span·class="p">,</span><span·class="w">
533 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="1584262473-3">(</span><span·class="n">LogFile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;~ts\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1584262473-4">[</span><span·class="n"[·...·truncated·by·diffoscope;·len:·109,·SHA:·ad6bea400a6bd391afa850bf0227c2fda262c56d0697392edce89ebc0a7f2b5f·...·]-3">)</span><span·class="w">533 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7752879291-3">(</span><span·class="n">LogFile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;~ts\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7752879291-4">[</span><span·class="n"[·...·truncated·by·diffoscope;·len:·109,·SHA:·ae5546c0fe320abb699ba6bee45e73b45c46c12488dacce169598c0a890db4c2·...·]-3">)</span><span·class="w">
534 </span><span·class="k">end</span></code></pre><p>If·<code·class="inline">error_info</code>·is·provided·with·the·exception,·<code·class="inline">format_exception</code>·will·use·that534 </span><span·class="k">end</span></code></pre><p>If·<code·class="inline">error_info</code>·is·provided·with·the·exception,·<code·class="inline">format_exception</code>·will·use·that
535 information·to·provide·additional·information·about·the·exception.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">try</span><span·class="w">535 information·to·provide·additional·information·about·the·exception.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">try</span><span·class="w">
536 ··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">raise</span><span·class="p"·data-group-id="9897743099-1">(</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p"·data-group-id="9897743099-2">[</span><span·class="p"·data-group-id="9897743099-2">]</span><span·class="p">,</span><span·class="p"·data-group-id="9897743099-3">[</spa[·...·truncated·by·diffoscope;·len:·367,·SHA:·1a0942fbd875f590c127ac40ce7e6e18a010f08b3b86611ad16789f913125a38·...·]-1">)</span><span·class="w">536 ··</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">raise</span><span·class="p"·data-group-id="9202739703-1">(</span><span·class="ss">badarg</span><span·class="p">,</span><span·class="p"·data-group-id="9202739703-2">[</span><span·class="p"·data-group-id="9202739703-2">]</span><span·class="p">,</span><span·class="p"·data-group-id="9202739703-3">[</spa[·...·truncated·by·diffoscope;·len:·367,·SHA:·e77dcc4cff7d24756ba97f03b998ee7e86e35c1542e4c5482317910247ea1ffc·...·]-1">)</span><span·class="w">
537 </span><span·class="k">catch</span><span·class="w">537 </span><span·class="k">catch</span><span·class="w">
538 ····</span><span·class="n">C</span><span·class="p">:</span><span·class="n">R</span><span·class="p">:</span><span·class="n">Stk</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">538 ····</span><span·class="n">C</span><span·class="p">:</span><span·class="n">R</span><span·class="p">:</span><span·class="n">Stk</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
539 ········</span><span·class="n">Message</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_error</span><span·class="p">:</span><span·class="nf">format_exception</span><span·class="p"·data-group-id="9897743099-6">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Stk</span><span·class="p"·data-group-id="9897743099-6">)</span><span·class="p">,</span><span·class="w">539 ········</span><span·class="n">Message</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_error</span><span·class="p">:</span><span·class="nf">format_exception</span><span·class="p"·data-group-id="9202739703-6">(</span><span·class="n">C</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Stk</span><span·class="p"·data-group-id="9202739703-6">)</span><span·class="p">,</span><span·class="w">
540 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9897743099-7">(</span><span·class="n">LogFile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;~ts\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9897743099-8">[</span><span·class="n">[·...·truncated·by·diffoscope;·len:·108,·SHA:·51652aabdbc952c4c94fec04623577ca0dc310d1116966c1089d08f536b52d1f·...·]-7">)</span><span·class="w">540 ········</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9202739703-7">(</span><span·class="n">LogFile</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;~ts\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9202739703-8">[</span><span·class="n">[·...·truncated·by·diffoscope;·len:·108,·SHA:·96851e965a0f0941f41ab2aba5fd33d9553df780f26218ec56063398907614ad·...·]-7">)</span><span·class="w">
541 </span><span·class="k">end</span></code></pre><p>See·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#error/3"><code·class="inline">erlang:error/3</code></a>·for·details·on·how·to·raise·an·exception·with·<code·class="inline">error_info</code>541 </span><span·class="k">end</span></code></pre><p>See·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#error/3"><code·class="inline">erlang:error/3</code></a>·for·details·on·how·to·raise·an·exception·with·<code·class="inline">error_info</code>
542 included.</p>542 included.</p>
543 ··</section>543 ··</section>
544 </section>544 </section>
  
545 ····</div>545 ····</div>
546 ··</section>546 ··</section>
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566 ······<p·class="built-using">566 ······<p·class="built-using">
567 ········Built·using567 ········Built·using
568 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the568 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
569 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>569 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
570 ······</p>570 ······</p>
571 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>571 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
572 ····</footer>572 ····</footer>
573 ··</div>573 ··</div>
574 </main>574 </main>
575 </div>575 </div>
576 <script>576 <script>
577 ··function·mermaidLoaded()·{577 ··function·mermaidLoaded()·{
578 ····mermaid.initialize({578 ····mermaid.initialize({
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137 ··<span·class="text">Local·Function·Handler</span>137 ··<span·class="text">Local·Function·Handler</span>
138 </h2>138 </h2>
139 <p>During·evaluation·of·a·function,·no·calls·can·be·made·to·local·functions.·An139 <p>During·evaluation·of·a·function,·no·calls·can·be·made·to·local·functions.·An
140 undefined·function·error·would·be·generated.·However,·the·optional·argument140 undefined·function·error·would·be·generated.·However,·the·optional·argument
141 <code·class="inline">LocalFunctionHandler</code>·can·be·used·to·define·a·function·that·is·called·when141 <code·class="inline">LocalFunctionHandler</code>·can·be·used·to·define·a·function·that·is·called·when
142 there·is·a·call·to·a·local·function.·The·argument·can·have·the·following142 there·is·a·call·to·a·local·function.·The·argument·can·have·the·following
143 formats:</p><ul><li><p><strong><code·class="inline">{value,Func}</code></strong>·-·This·defines·a·local·function·handler·that·is·called143 formats:</p><ul><li><p><strong><code·class="inline">{value,Func}</code></strong>·-·This·defines·a·local·function·handler·that·is·called
144 with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Func</span><span·class="p"·data-group-id="6185742994-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arguments</span><span·class="p"·data-group-id="6185742994-1">)</span></code></pre><p><code·class="inline">Name</code>·is·the·name·of·the·local·function·(an·atom)·and·<code·class="inline">Arguments</code>·is·a·list144 with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Func</span><span·class="p"·data-group-id="7147800014-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arguments</span><span·class="p"·data-group-id="7147800014-1">)</span></code></pre><p><code·class="inline">Name</code>·is·the·name·of·the·local·function·(an·atom)·and·<code·class="inline">Arguments</code>·is·a·list
145 of·the·<em>evaluated</em>·arguments.·The·function·handler·returns·the·value·of·the145 of·the·<em>evaluated</em>·arguments.·The·function·handler·returns·the·value·of·the
146 local·function.·In·this·case,·the·current·bindings·cannot·be·accessed.·To146 local·function.·In·this·case,·the·current·bindings·cannot·be·accessed.·To
147 signal·an·error,·the·function·handler·calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a>·with·a147 signal·an·error,·the·function·handler·calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a>·with·a
148 suitable·exit·value.</p></li><li><p><strong><code·class="inline">{eval,Func}</code></strong>·-·This·defines·a·local·function·handler·that·is·called·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Func</span><span·class="p"·data-group-id="5867495955-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arguments</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bindings</span><span·class="p"·data-group-id="5867495955-1">)</span></code></pre><p><code·class="inline">Name</code>·is·the·name·of·the·local·function·(an·atom),·<code·class="inline">Arguments</code>·is·a·list·of148 suitable·exit·value.</p></li><li><p><strong><code·class="inline">{eval,Func}</code></strong>·-·This·defines·a·local·function·handler·that·is·called·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Func</span><span·class="p"·data-group-id="7659478481-1">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arguments</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bindings</span><span·class="p"·data-group-id="7659478481-1">)</span></code></pre><p><code·class="inline">Name</code>·is·the·name·of·the·local·function·(an·atom),·<code·class="inline">Arguments</code>·is·a·list·of
149 the·<em>unevaluated</em>·arguments,·and·<code·class="inline">Bindings</code>·are·the·current·variable·bindings.149 the·<em>unevaluated</em>·arguments,·and·<code·class="inline">Bindings</code>·are·the·current·variable·bindings.
150 The·function·handler·returns:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0903131985-1">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="n">Value</span><span·class="p">,</span><span·class="n">NewBindings</span><span·class="p"·data-group-id="0903131985-1">}</span></code></pre><p><code·class="inline">Value</code>·is·the·value·of·the·local·function·and·<code·class="inline">NewBindings</code>·are·the·updated150 The·function·handler·returns:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="8444523205-1">{</span><span·class="ss">value</span><span·class="p">,</span><span·class="n">Value</span><span·class="p">,</span><span·class="n">NewBindings</span><span·class="p"·data-group-id="8444523205-1">}</span></code></pre><p><code·class="inline">Value</code>·is·the·value·of·the·local·function·and·<code·class="inline">NewBindings</code>·are·the·updated
151 variable·bindings.·In·this·case,·the·function·handler·must·itself·evaluate·all151 variable·bindings.·In·this·case,·the·function·handler·must·itself·evaluate·all
152 the·function·arguments·and·manage·the·bindings.·To·signal·an·error,·the152 the·function·arguments·and·manage·the·bindings.·To·signal·an·error,·the
153 function·handler·calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a>·with·a·suitable·exit·value.</p></li><li><p><strong><code·class="inline">none</code></strong>·-·There·is·no·local·function·handler.</p></li></ul><h2·id="module-non-local-function-handler"·class="section-heading">153 function·handler·calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a>·with·a·suitable·exit·value.</p></li><li><p><strong><code·class="inline">none</code></strong>·-·There·is·no·local·function·handler.</p></li></ul><h2·id="module-non-local-function-handler"·class="section-heading">
154 ··<a·href="#module-non-local-function-handler"·class="hover-link">154 ··<a·href="#module-non-local-function-handler"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">Non-Local·Function·Handler</span>157 ··<span·class="text">Non-Local·Function·Handler</span>
158 </h2>158 </h2>
159 <p>The·optional·argument·<code·class="inline">NonLocalFunctionHandler</code>·can·be·used·to·define·a·function159 <p>The·optional·argument·<code·class="inline">NonLocalFunctionHandler</code>·can·be·used·to·define·a·function
160 that·is·called·in·the·following·cases:</p><ul><li>A·functional·object·(fun)·is·called.</li><li>A·built-in·function·is·called.</li><li>A·function·is·called·using·the·<code·class="inline">M:F</code>·syntax,·where·<code·class="inline">M</code>·and·<code·class="inline">F</code>·are·atoms·or160 that·is·called·in·the·following·cases:</p><ul><li>A·functional·object·(fun)·is·called.</li><li>A·built-in·function·is·called.</li><li>A·function·is·called·using·the·<code·class="inline">M:F</code>·syntax,·where·<code·class="inline">M</code>·and·<code·class="inline">F</code>·are·atoms·or
161 expressions.</li><li>An·operator·<code·class="inline">Op/A</code>·is·called·(this·is·handled·as·a·call·to·function161 expressions.</li><li>An·operator·<code·class="inline">Op/A</code>·is·called·(this·is·handled·as·a·call·to·function
162 <code·class="inline">erlang:Op/A</code>).</li></ul><p>Exceptions·are·calls·to·<code·class="inline">erlang:apply/2,3</code>;·neither·of·the·function·handlers·are162 <code·class="inline">erlang:Op/A</code>).</li></ul><p>Exceptions·are·calls·to·<code·class="inline">erlang:apply/2,3</code>;·neither·of·the·function·handlers·are
163 called·for·such·calls.·The·argument·can·have·the·following·formats:</p><ul><li><p><strong><code·class="inline">{value,Func}</code></strong>·-·This·defines·a·non-local·function·handler.·The·function163 called·for·such·calls.·The·argument·can·have·the·following·formats:</p><ul><li><p><strong><code·class="inline">{value,Func}</code></strong>·-·This·defines·a·non-local·function·handler.·The·function
164 may·be·called·with·two·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Func</span><span·class="p"·data-group-id="3016696755-1">(</span><span·class="n">FuncSpec</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arguments</span><span·class="p"·data-group-id="3016696755-1">)</span></code></pre><p>or·three·arguments:</p><pre><code·class="makeup·erlang[·...·truncated·by·diffoscope;·len:·324,·SHA:·19d3936c4690367d8b8f14ff3b7213cc450ff890c039635a0d285b58764535fa·...·]-1">)</span></code></pre><p><code·class="inline">Anno</code>·is·the·<a·href="erl_anno.html#t:anno/0"><code·class="inline">erl_anno:anno()</code></a>·of·the·node,·<code·class="inline">FuncSpec</code>164 may·be·called·with·two·arguments:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Func</span><span·class="p"·data-group-id="6106209191-1">(</span><span·class="n">FuncSpec</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arguments</span><span·class="p"·data-group-id="6106209191-1">)</span></code></pre><p>or·three·arguments:</p><pre><code·class="makeup·erlang[·...·truncated·by·diffoscope;·len:·324,·SHA:·c559c140cf63c67c644231b25e48806d5de813618d2270a589f33a5dc1160cca·...·]-1">)</span></code></pre><p><code·class="inline">Anno</code>·is·the·<a·href="erl_anno.html#t:anno/0"><code·class="inline">erl_anno:anno()</code></a>·of·the·node,·<code·class="inline">FuncSpec</code>
165 is·the·name·of·the·function·on·the·form·<code·class="inline">{Module,Function}</code>·or·a·fun,·and165 is·the·name·of·the·function·on·the·form·<code·class="inline">{Module,Function}</code>·or·a·fun,·and
166 <code·class="inline">Arguments</code>·is·a·list·of·the·<em>evaluated</em>·arguments.·The·function·handler166 <code·class="inline">Arguments</code>·is·a·list·of·the·<em>evaluated</em>·arguments.·The·function·handler
167 returns·the·value·of·the·function.·To·signal·an·error,·the·function·handler167 returns·the·value·of·the·function.·To·signal·an·error,·the·function·handler
168 calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a>·with·a·suitable·exit·value.</p></li><li><p><strong><code·class="inline">none</code></strong>·-·There·is·no·non-local·function·handler.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>For·calls·such·as·<code·class="inline">erlang:apply(Fun,·Args)</code>·or168 calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#exit/1"><code·class="inline">exit/1</code></a>·with·a·suitable·exit·value.</p></li><li><p><strong><code·class="inline">none</code></strong>·-·There·is·no·non-local·function·handler.</p></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>For·calls·such·as·<code·class="inline">erlang:apply(Fun,·Args)</code>·or
169 <code·class="inline">erlang:apply(Module,·Function,·Args)</code>,·the·call·of·the·non-local·function169 <code·class="inline">erlang:apply(Module,·Function,·Args)</code>,·the·call·of·the·non-local·function
170 handler·corresponding·to·the·call·to·<code·class="inline">erlang:apply/2,3</code>·itself170 handler·corresponding·to·the·call·to·<code·class="inline">erlang:apply/2,3</code>·itself
171 (<code·class="inline">Func({erlang,·apply},·[Fun,·Args])</code>·or171 (<code·class="inline">Func({erlang,·apply},·[Fun,·Args])</code>·or
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1365 ······<p·class="built-using">1365 ······<p·class="built-using">
1366 ········Built·using1366 ········Built·using
1367 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1367 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1368 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1368 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1369 ······</p>1369 ······</p>
1370 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1370 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1371 ····</footer>1371 ····</footer>
1372 ··</div>1372 ··</div>
1373 </main>1373 </main>
1374 </div>1374 </div>
1375 <script>1375 <script>
1376 ··function·mermaidLoaded()·{1376 ··function·mermaidLoaded()·{
1377 ····mermaid.initialize({1377 ····mermaid.initialize({
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230 ······<p·class="built-using">230 ······<p·class="built-using">
231 ········Built·using231 ········Built·using
232 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the232 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
233 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>233 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
234 ······</p>234 ······</p>
235 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>235 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
236 ····</footer>236 ····</footer>
237 ··</div>237 ··</div>
238 </main>238 </main>
239 </div>239 </div>
240 <script>240 <script>
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242 ····mermaid.initialize({242 ····mermaid.initialize({
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571 ········Built·using571 ········Built·using
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573 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>573 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
574 ······</p>574 ······</p>
575 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>575 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
576 ····</footer>576 ····</footer>
577 ··</div>577 ··</div>
578 </main>578 </main>
579 </div>579 </div>
580 <script>580 <script>
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286 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>286 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
287 ······</p>287 ······</p>
288 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>288 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
289 ····</footer>289 ····</footer>
290 ··</div>290 ··</div>
291 </main>291 </main>
292 </div>292 </div>
293 <script>293 <script>
294 ··function·mermaidLoaded()·{294 ··function·mermaidLoaded()·{
295 ····mermaid.initialize({295 ····mermaid.initialize({
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556 ······<p·class="built-using">556 ······<p·class="built-using">
557 ········Built·using557 ········Built·using
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559 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>559 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
560 ······</p>560 ······</p>
561 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>561 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
562 ····</footer>562 ····</footer>
563 ··</div>563 ··</div>
564 </main>564 </main>
565 </div>565 </div>
566 <script>566 <script>
567 ··function·mermaidLoaded()·{567 ··function·mermaidLoaded()·{
568 ····mermaid.initialize({568 ····mermaid.initialize({
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135 your·own·Erlang·compiler.</p><h2·id="module-error-information"·class="section-heading">135 your·own·Erlang·compiler.</p><h2·id="module-error-information"·class="section-heading">
136 ··<a·href="#module-error-information"·class="hover-link">136 ··<a·href="#module-error-information"·class="hover-link">
137 ····<i·class="ri-link-m"·aria-hidden="true"></i>137 ····<i·class="ri-link-m"·aria-hidden="true"></i>
138 ··</a>138 ··</a>
139 ··<span·class="text">Error·Information</span>139 ··<span·class="text">Error·Information</span>
140 </h2>140 </h2>
141 <p><code·class="inline">ErrorInfo</code>·is·the·standard·<code·class="inline">ErrorInfo</code>·structure·that·is·returned·from·all·I/O141 <p><code·class="inline">ErrorInfo</code>·is·the·standard·<code·class="inline">ErrorInfo</code>·structure·that·is·returned·from·all·I/O
142 modules.·The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9120606484-1">{</span><span·class="n">ErrorLine</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="91206064[·...·truncated·by·diffoscope;·len:·369,·SHA:·0b45707501bf7b66eaa2dc9bcc4c65aac48b879c90e59fa8cebb8395afe646a8·...·]-1">)</span></code></pre><h2·id="module-see-also"·class="section-heading">142 modules.·The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1017413658-1">{</span><span·class="n">ErrorLine</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="10174136[·...·truncated·by·diffoscope;·len:·369,·SHA:·dd7a5b375c55705af04dd83a1be4edc88c89585093904d0c58e151f14df1acd0·...·]-1">)</span></code></pre><h2·id="module-see-also"·class="section-heading">
143 ··<a·href="#module-see-also"·class="hover-link">143 ··<a·href="#module-see-also"·class="hover-link">
144 ····<i·class="ri-link-m"·aria-hidden="true"></i>144 ····<i·class="ri-link-m"·aria-hidden="true"></i>
145 ··</a>145 ··</a>
146 ··<span·class="text">See·Also</span>146 ··<span·class="text">See·Also</span>
147 </h2>147 </h2>
148 <p><a·href="epp.html"><code·class="inline">epp</code></a>,·<a·href="erl_parse.html"><code·class="inline">erl_parse</code></a></p>148 <p><a·href="epp.html"><code·class="inline">epp</code></a>,·<a·href="erl_parse.html"><code·class="inline">erl_parse</code></a></p>
149 ····</section>149 ····</section>
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573 ······<p·class="built-using">573 ······<p·class="built-using">
574 ········Built·using574 ········Built·using
575 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the575 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
576 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>576 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
577 ······</p>577 ······</p>
578 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>578 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
579 ····</footer>579 ····</footer>
580 ··</div>580 ··</div>
581 </main>581 </main>
582 </div>582 </div>
583 <script>583 <script>
584 ··function·mermaidLoaded()·{584 ··function·mermaidLoaded()·{
585 ····mermaid.initialize({585 ····mermaid.initialize({
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134 (see·the·<a·href="erl_scan.html"><code·class="inline">erl_scan</code></a>)·module.</p><h2·id="module-error-information"·class="section-heading">134 (see·the·<a·href="erl_scan.html"><code·class="inline">erl_scan</code></a>)·module.</p><h2·id="module-error-information"·class="section-heading">
135 ··<a·href="#module-error-information"·class="hover-link">135 ··<a·href="#module-error-information"·class="hover-link">
136 ····<i·class="ri-link-m"·aria-hidden="true"></i>136 ····<i·class="ri-link-m"·aria-hidden="true"></i>
137 ··</a>137 ··</a>
138 ··<span·class="text">Error·Information</span>138 ··<span·class="text">Error·Information</span>
139 </h2>139 </h2>
140 <p>ErrorInfo·is·the·standard·ErrorInfo·structure·that·is·returned·from·all·I/O·modules.140 <p>ErrorInfo·is·the·standard·ErrorInfo·structure·that·is·returned·from·all·I/O·modules.
141 The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0297243471-1">{</span><span·class="n">ErrorLine</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="02972434[·...·truncated·by·diffoscope;·len:·369,·SHA:·40aca3024a22b77b362ab439dc69a7f190eec34e4e833b070b47b7c6b3ed2081·...·]-1">)</span></code></pre><h2·id="module-see-also"·class="section-heading">141 The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9441117079-1">{</span><span·class="n">ErrorLine</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="94411170[·...·truncated·by·diffoscope;·len:·369,·SHA:·fe1de53e0d79bc5b65385c6a8607162f6f12394bbd0dc2c1fe5176efa01fd9a9·...·]-1">)</span></code></pre><h2·id="module-see-also"·class="section-heading">
142 ··<a·href="#module-see-also"·class="hover-link">142 ··<a·href="#module-see-also"·class="hover-link">
143 ····<i·class="ri-link-m"·aria-hidden="true"></i>143 ····<i·class="ri-link-m"·aria-hidden="true"></i>
144 ··</a>144 ··</a>
145 ··<span·class="text">See·Also</span>145 ··<span·class="text">See·Also</span>
146 </h2>146 </h2>
147 <p><a·href="erl_anno.html"><code·class="inline">erl_anno</code></a>,·<a·href="erl_scan.html"><code·class="inline">erl_scan</code></a>,·<a·href="io.html"><code·class="inline">io</code></a>,·section·<a·href="../../../../erts-15.2.6/doc/html/absform.html">The·Abstract·Format</a>147 <p><a·href="erl_anno.html"><code·class="inline">erl_anno</code></a>,·<a·href="erl_scan.html"><code·class="inline">erl_scan</code></a>,·<a·href="io.html"><code·class="inline">io</code></a>,·section·<a·href="../../../../erts-15.2.6/doc/html/absform.html">The·Abstract·Format</a>
148 in·the·ERTS·User's·Guide.</p>148 in·the·ERTS·User's·Guide.</p>
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5628 ······<p·class="built-using">5628 ······<p·class="built-using">
5629 ········Built·using5629 ········Built·using
5630 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the5630 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
5631 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>5631 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
5632 ······</p>5632 ······</p>
5633 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>5633 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
5634 ····</footer>5634 ····</footer>
5635 ··</div>5635 ··</div>
5636 </main>5636 </main>
5637 </div>5637 </div>
5638 <script>5638 <script>
5639 ··function·mermaidLoaded()·{5639 ··function·mermaidLoaded()·{
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964 ········Built·using964 ········Built·using
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966 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>966 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
967 ······</p>967 ······</p>
968 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>968 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
969 ····</footer>969 ····</footer>
970 ··</div>970 ··</div>
971 </main>971 </main>
972 </div>972 </div>
973 <script>973 <script>
974 ··function·mermaidLoaded()·{974 ··function·mermaidLoaded()·{
975 ····mermaid.initialize({975 ····mermaid.initialize({
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132 tokens.</p><h2·id="module-error-information"·class="section-heading">132 tokens.</p><h2·id="module-error-information"·class="section-heading">
133 ··<a·href="#module-error-information"·class="hover-link">133 ··<a·href="#module-error-information"·class="hover-link">
134 ····<i·class="ri-link-m"·aria-hidden="true"></i>134 ····<i·class="ri-link-m"·aria-hidden="true"></i>
135 ··</a>135 ··</a>
136 ··<span·class="text">Error·Information</span>136 ··<span·class="text">Error·Information</span>
137 </h2>137 </h2>
138 <p><code·class="inline">ErrorInfo</code>·is·the·standard·<code·class="inline">ErrorInfo</code>·structure·that·is·returned·from·all·I/O138 <p><code·class="inline">ErrorInfo</code>·is·the·standard·<code·class="inline">ErrorInfo</code>·structure·that·is·returned·from·all·I/O
139 modules.·The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9419994935-1">{</span><span·class="n">ErrorLocation</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="9419[·...·truncated·by·diffoscope;·len:·373,·SHA:·e9ee60d4977d1ed9a5bfb992cf615495961a79b7832e980745f7f9797f2b8d87·...·]-1">)</span></code></pre><h2·id="module-notes"·class="section-heading">139 modules.·The·format·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6902901184-1">{</span><span·class="n">ErrorLocation</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ErrorDescriptor</span><span·class="p"·data-group-id="6902[·...·truncated·by·diffoscope;·len:·373,·SHA:·8dc828d908a22a74f049b4486c80f0ed761e311ee35b13f293cc6296268bfff2·...·]-1">)</span></code></pre><h2·id="module-notes"·class="section-heading">
140 ··<a·href="#module-notes"·class="hover-link">140 ··<a·href="#module-notes"·class="hover-link">
141 ····<i·class="ri-link-m"·aria-hidden="true"></i>141 ····<i·class="ri-link-m"·aria-hidden="true"></i>
142 ··</a>142 ··</a>
143 ··<span·class="text">Notes</span>143 ··<span·class="text">Notes</span>
144 </h2>144 </h2>
145 <p>The·continuation·of·the·first·call·to·the·re-entrant·input·functions·must·be145 <p>The·continuation·of·the·first·call·to·the·re-entrant·input·functions·must·be
146 <code·class="inline">[]</code>.·For·a·complete·description·of·how·the·re-entrant·input·scheme·works,·see146 <code·class="inline">[]</code>.·For·a·complete·description·of·how·the·re-entrant·input·scheme·works,·see
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1288 ········Built·using1288 ········Built·using
1289 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1289 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1290 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1290 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1291 ······</p>1291 ······</p>
1292 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1292 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1293 ····</footer>1293 ····</footer>
1294 ··</div>1294 ··</div>
1295 </main>1295 </main>
1296 </div>1296 </div>
1297 <script>1297 <script>
1298 ··function·mermaidLoaded()·{1298 ··function·mermaidLoaded()·{
1299 ····mermaid.initialize({1299 ····mermaid.initialize({
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1239 storage·handling·function.</p><p>Parameter·<code·class="inline">UserData</code>·is·typically·the·result·of·opening·a·low-level·structure1239 storage·handling·function.</p><p>Parameter·<code·class="inline">UserData</code>·is·typically·the·result·of·opening·a·low-level·structure
1240 like·a·file·descriptor·or·an·SFTP·channel·id.·The·different·<code·class="inline">Fun</code>·clauses1240 like·a·file·descriptor·or·an·SFTP·channel·id.·The·different·<code·class="inline">Fun</code>·clauses
1241 operate·on·that·very·term.</p><p>The·following·are·the·fun·clauses·parameter·lists:</p><ul><li><p><strong><code·class="inline">(write,·{UserData,DataToWrite})</code></strong>·-·Writes·term·<code·class="inline">DataToWrite</code>·using1241 operate·on·that·very·term.</p><p>The·following·are·the·fun·clauses·parameter·lists:</p><ul><li><p><strong><code·class="inline">(write,·{UserData,DataToWrite})</code></strong>·-·Writes·term·<code·class="inline">DataToWrite</code>·using
1242 <code·class="inline">UserData</code>.</p></li><li><p><strong><code·class="inline">(close,·UserData)</code></strong>·-·Closes·the·access.</p></li><li><p><strong><code·class="inline">(read2,·{UserData,Size})</code></strong>·-·Reads·using·<code·class="inline">UserData</code>·but·only·<code·class="inline">Size</code>·bytes.1242 <code·class="inline">UserData</code>.</p></li><li><p><strong><code·class="inline">(close,·UserData)</code></strong>·-·Closes·the·access.</p></li><li><p><strong><code·class="inline">(read2,·{UserData,Size})</code></strong>·-·Reads·using·<code·class="inline">UserData</code>·but·only·<code·class="inline">Size</code>·bytes.
1243 Notice·that·there·is·only·an·arity-2·read·function,·not·an·arity-1·function.</p></li><li><p><strong><code·class="inline">(position,{UserData,Position})</code></strong>·-·Sets·the·position·of·<code·class="inline">UserData</code>·as1243 Notice·that·there·is·only·an·arity-2·read·function,·not·an·arity-1·function.</p></li><li><p><strong><code·class="inline">(position,{UserData,Position})</code></strong>·-·Sets·the·position·of·<code·class="inline">UserData</code>·as
1244 defined·for·files·in·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#position/2"><code·class="inline">file:position/2</code></a></p></li></ul><p><em>Example:</em></p><p>The·following·is·a·complete·<code·class="inline">Fun</code>·parameter·for·reading·and·writing·on·files1244 defined·for·files·in·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#position/2"><code·class="inline">file:position/2</code></a></p></li></ul><p><em>Example:</em></p><p>The·following·is·a·complete·<code·class="inline">Fun</code>·parameter·for·reading·and·writing·on·files
1245 using·the·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ExampleFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">1245 using·the·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ExampleFun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
1246 ···</span><span·class="nf">fun</span><span·class="p"·data-group-id="7989341848-1">(</span><span·class="ss">write</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7989341848-2">{</span><span·class="n">Fd</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·430,·SHA:·3c00ff8d450ce590fbdd348a739639406760a4e96a00a14dc9466c75fc6955a3·...·]-3">)</span><span·class="p">;</span><span·class="w">1246 ···</span><span·class="nf">fun</span><span·class="p"·data-group-id="4981752413-1">(</span><span·class="ss">write</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4981752413-2">{</span><span·class="n">Fd</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·430,·SHA:·7298304e511b5aca8b33770e0e8724a685c3ff2cb946c031382470b9daa5a2d6·...·]-3">)</span><span·class="p">;</span><span·class="w">
1247 ······</span><span·class="p"·data-group-id="7989341848-4">(</span><span·class="ss">position</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7989341848-5">{</span><span·class="n">Fd</span><span·class="p">,</span><span·class="n">Pos</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·433,·SHA:·12300275aa17c66d38cdcce232adcf216284132b879ab075df0fccfc70c8b942·...·]-6">)</span><span·class="p">;</span><span·class="w">1247 ······</span><span·class="p"·data-group-id="4981752413-4">(</span><span·class="ss">position</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4981752413-5">{</span><span·class="n">Fd</span><span·class="p">,</span><span·class="n">Pos</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·433,·SHA:·a722418cc70a32e27239036d24adc7e23bb456f87e76aa17728b1b22b25f2089·...·]-6">)</span><span·class="p">;</span><span·class="w">
1248 ······</span><span·class="p"·data-group-id="7989341848-7">(</span><span·class="ss">read2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7989341848-8">{</span><span·class="n">Fd</span><span·class="p">,</span><span·class="n">Size</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·428,·SHA:·2376b4d4151462a606b5f737e1a8468f2ee9eba4cb32662377a80f70ba196f5d·...·]-9">)</span><span·class="p">;</span><span·class="w">1248 ······</span><span·class="p"·data-group-id="4981752413-7">(</span><span·class="ss">read2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4981752413-8">{</span><span·class="n">Fd</span><span·class="p">,</span><span·class="n">Size</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·428,·SHA:·bfd87143b6c565aaf23bcb6f98533de66c2527997c6b2c8a0f639e2a2deb3c0e·...·]-9">)</span><span·class="p">;</span><span·class="w">
1249 ······</span><span·class="p"·data-group-id="7989341848-10">(</span><span·class="ss">close</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="7989341848-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·200,·SHA:·9ad4fd8c53fe37247e4692dfd9339eea2f832949b88b09204a47410157477e2b·...·]-11">)</span><span·class="w">1249 ······</span><span·class="p"·data-group-id="4981752413-10">(</span><span·class="ss">close</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Fd</span><span·class="p"·data-group-id="4981752413-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·200,·SHA:·3126201a9ac8505d2ee34680799c498c48441a43d409b7159860ec9c6d0ebe9d·...·]-11">)</span><span·class="w">
1250 ···</span><span·class="k">end</span></code></pre><p>Here·<code·class="inline">Fd</code>·was·specified·to·function·<a·href="#init/3"><code·class="inline">init/3</code></a>·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6047782982-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Fd</span><span·class="p"·data-group-id="6047782982-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="6047782982-2">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="6047782982-2">)</span><span·class="p">.</span><span·class="w"> 
1251 </span><span·class="p"·data-group-id="6047782982-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TarDesc</span><span·class="p"·data-group-id="6047782982-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w"[·...·truncated·by·diffoscope;·len:·1041,·SHA:·a21c484d49c02871e691a3982ba81b40506781156be9072208bc026fc4f9471a·...·]</span><span·class="w">1250 ···</span><span·class="k">end</span></code></pre><p>Here·<code·class="inline">Fd</code>·was·specified·to·function·<a·href="#init/3"><code·class="inline">init/3</code></a>·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·573,·SHA:·6a67f778e1aae1563a8cfcf0ec4cd4a54ecf654efeae4662b5f2f0858581d8c0·...·]</span><span·class="w">
 1251 </span><span·class="p"·data-group-id="3522436839-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TarDesc</span><span·class="p"·data-group-id="3522436839-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_tar</span><span·class="p">:</span><span·class="nf">init</span><span·class="p"·data-group-id="3522436839-4">(</span><span·class="n">Fd</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3522436839-5">[</span><span·class="ss">write</span><span·class="p"·data-group-id="3522436839-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ExampleFun</span><span·class="p"·data-group-id="3522436839-4">)</span><span·class="p">,</span></code></pre><p><code·class="inline">TarDesc</code>·is·then·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">erl_tar</span><span·class="p">:</span><span·class="nf">add</span><span·class="p"·data-group-id="4811096280-1">(</span><span·class="n">TarDesc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SomeValueIwantToAdd</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FileNameInTarFile</span><span·class="p"·data-group-id="4811096280-1">)</span><span·class="p">,</span><span·class="w">
1252 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">1252 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">,</span><span·class="w">
1253 </span><span·class="nc">erl_tar</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="0141900757-2">(</span><span·class="n">TarDesc</span><span·class="p"·data-group-id="0141900757-2">)</span></code></pre><p>When·the·<code·class="inline">erl_tar</code>·core·wants·to,·for·example,·write·a·piece·of·<code·class="inline">Data</code>,·it·would1253 </span><span·class="nc">erl_tar</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="4811096280-2">(</span><span·class="n">TarDesc</span><span·class="p"·data-group-id="4811096280-2">)</span></code></pre><p>When·the·<code·class="inline">erl_tar</code>·core·wants·to,·for·example,·write·a·piece·of·<code·class="inline">Data</code>,·it·would
1254 call·<code·class="inline">ExampleFun(write,·{UserData,Data})</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·example·with·the·<code·class="inline">file</code>·module·operations·is·not·necessary·to·use1254 call·<code·class="inline">ExampleFun(write,·{UserData,Data})</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·example·with·the·<code·class="inline">file</code>·module·operations·is·not·necessary·to·use
1255 directly,·as·that·is·what·function·<a·href="#open/2"><code·class="inline">open/2</code></a>·in·principle·does.</p></section><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>The·<code·class="inline">TarDescriptor</code>·term·is·not·a·file·descriptor.·You·are·advised·not·to·rely1255 directly,·as·that·is·what·function·<a·href="#open/2"><code·class="inline">open/2</code></a>·in·principle·does.</p></section><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>The·<code·class="inline">TarDescriptor</code>·term·is·not·a·file·descriptor.·You·are·advised·not·to·rely
1256 on·the·specific·contents·of·this·term,·as·it·can·change·in·future·Erlang/OTP1256 on·the·specific·contents·of·this·term,·as·it·can·change·in·future·Erlang/OTP
1257 releases·when·more·features·are·added·to·this·module.</p></section>1257 releases·when·more·features·are·added·to·this·module.</p></section>
1258 ··</section>1258 ··</section>
1259 </section>1259 </section>
1260 <section·class="detail"·id="open/2">1260 <section·class="detail"·id="open/2">
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1425 ······<p·class="built-using">1425 ······<p·class="built-using">
1426 ········Built·using1426 ········Built·using
1427 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1427 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1428 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1428 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1429 ······</p>1429 ······</p>
1430 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1430 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1431 ····</footer>1431 ····</footer>
1432 ··</div>1432 ··</div>
1433 </main>1433 </main>
1434 </div>1434 </div>
1435 <script>1435 <script>
1436 ··function·mermaidLoaded()·{1436 ··function·mermaidLoaded()·{
1437 ····mermaid.initialize({1437 ····mermaid.initialize({
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502 <code·class="inline">shebang</code>·defaults·to·<code·class="inline">&quot;/usr/bin/env·escript&quot;</code>.·The·<code·class="inline">comment</code>·defaults·to502 <code·class="inline">shebang</code>·defaults·to·<code·class="inline">&quot;/usr/bin/env·escript&quot;</code>.·The·<code·class="inline">comment</code>·defaults·to
503 <code·class="inline">&quot;This·is·an·-*-·erlang·-*-·file&quot;</code>.·The·created·escript·can·either·be·returned503 <code·class="inline">&quot;This·is·an·-*-·erlang·-*-·file&quot;</code>.·The·created·escript·can·either·be·returned
504 as·a·binary·or·written·to·file.</p><p>As·an·example·of·how·the·function·can·be·used,·we·create·an·interpreted·escript504 as·a·binary·or·written·to·file.</p><p>As·an·example·of·how·the·function·can·be·used,·we·create·an·interpreted·escript
505 that·uses·<code·class="inline">emu_args</code>·to·set·some·emulator·flag.·In·this·case,·it·happens·to·set505 that·uses·<code·class="inline">emu_args</code>·to·set·some·emulator·flag.·In·this·case,·it·happens·to·set
506 number·of·schedulers·with·<code·class="inline">+S3</code>.·We·also·extract·the·different·sections·from·the506 number·of·schedulers·with·<code·class="inline">+S3</code>.·We·also·extract·the·different·sections·from·the
507 newly·created·script:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">Source</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;%%·Demo\nmain(_Args)·-&gt;\n····io:format(\&quot;</span><span·class="si">~p</span><span·class="s">\&quot;,[erlang:system_info(schedulers)]).\n&quot;</span><span·class="p">.</span><span·class="w">507 newly·created·script:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">Source</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;%%·Demo\nmain(_Args)·-&gt;\n····io:format(\&quot;</span><span·class="si">~p</span><span·class="s">\&quot;,[erlang:system_info(schedulers)]).\n&quot;</span><span·class="p">.</span><span·class="w">
508 </span><span·class="s">&quot;%%·Demo\nmain(_Args)·-&gt;\n····io:format(erlang:system_info(schedulers)).\n&quot;</span><span·class="gp·unselectable">508 </span><span·class="s">&quot;%%·Demo\nmain(_Args)·-&gt;\n····io:format(erlang:system_info(schedulers)).\n&quot;</span><span·class="gp·unselectable">
509 &gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3511760870-1">(</span><span·class="s">&quot;</span><span·class="si">~s</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511760870-2">[</span><span·class="n">Source</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·76,·SHA:·a2ae07be74fb11ad9a9975350dfd3fc0a4f04e5c91c8ac8b8e920ff279a7a677·...·]-1">)</span><span·class="p">.</span><span·class="w">509 &gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9896141268-1">(</span><span·class="s">&quot;</span><span·class="si">~s</span><span·class="s">\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9896141268-2">[</span><span·class="n">Source</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·76,·SHA:·e0b727a1a44187318991e3802e4517b34aa402033122c60057834ca3da15ac84·...·]-1">)</span><span·class="p">.</span><span·class="w">
510 </span><span·class="c1">%%·Demo</span><span·class="w">510 </span><span·class="c1">%%·Demo</span><span·class="w">
511 </span><span·class="nf">main</span><span·class="p"·data-group-id="3511760870-3">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="3511760870-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">511 </span><span·class="nf">main</span><span·class="p"·data-group-id="9896141268-3">(</span><span·class="p">_</span><span·class="n">Args</span><span·class="p"·data-group-id="9896141268-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
512 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3511760870-4">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="3511760870-5">(</span><span·class="ss">schedulers</span><span·class="p"·data-group-id="3511760870-5">)</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·66af8c117cdae14234f0b7cc48e5a616032ecbf4e70f504bc318f4bbb809c553·...·]-4">)</span><span·class="p">.</span><span·class="w">512 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9896141268-4">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="9896141268-5">(</span><span·class="ss">schedulers</span><span·class="p"·data-group-id="9896141268-5">)</span><span[·...·truncated·by·diffoscope;·len:·36,·SHA:·3dcbc3a6e449dcc75e5b093a990c6d20832c658bbde6cef317e3406c6f9647a4·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
513 </span><span·class="ss">ok</span><span·class="gp·unselectable">513 </span><span·class="ss">ok</span><span·class="gp·unselectable">
514 &gt;·</span><span·class="p"·data-group-id="3511760870-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="3511760870-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·630,·SHA:·4bd0a0dc07b9834ddf971838402fbdf51a23689d0c02a4e3c78eb1da44e2222c·...·]-9">}</span><span·class="p">,</span><span·class="w">514 &gt;·</span><span·class="p"·data-group-id="9896141268-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="9896141268-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·630,·SHA:·1f3060ac191a829c502bd35fad918dd336dfe03883a38bcb975c03c25e2ce972·...·]-9">}</span><span·class="p">,</span><span·class="w">
515 ······································</span><span·class="p"·data-group-id="3511760870-10">{</span><span·class="ss">source</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="3511760870-11">(</span><span·class="n">Source</span><span·class="p"·data-group-id="351[·...·truncated·by·diffoscope;·len:·168,·SHA:·b62dd63788224e4b89a549083a618c5af6a65b527d11fad0b36824438cc07dd0·...·]-7">)</span><span·class="p">.</span><span·class="w">515 ······································</span><span·class="p"·data-group-id="9896141268-10">{</span><span·class="ss">source</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="9896141268-11">(</span><span·class="n">Source</span><span·class="p"·data-group-id="989[·...·truncated·by·diffoscope;·len:·168,·SHA:·c949467fe05d635f3a2ce93c8d50361e06b9a1fd57a2fc027f9f201c811743c2·...·]-7">)</span><span·class="p">.</span><span·class="w">
516 </span><span·class="p"·data-group-id="3511760870-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3511760870-13">&lt;&lt;</span><span·class="s">&quot;#!/usr/bin/env·escript\n%%·This·is·an·-*-·erlang·-*-·file\n%%!+S3&quot;</span><span·class="p">.</spa[·...·truncated·by·diffoscope;·len:·152,·SHA:·018c07f797795062eca6e23c1436b3812bd00841a2e50d60798c0ed095b23bf6·...·]-12">}</span><span·class="gp·unselectable">516 </span><span·class="p"·data-group-id="9896141268-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="9896141268-13">&lt;&lt;</span><span·class="s">&quot;#!/usr/bin/env·escript\n%%·This·is·an·-*-·erlang·-*-·file\n%%!+S3&quot;</span><span·class="p">.</spa[·...·truncated·by·diffoscope;·len:·152,·SHA:·abfebb435dbc76c66e7f42ff1b2e13bb16a48ffea19227e346a7888a20ebb5fc·...·]-12">}</span><span·class="gp·unselectable">
517 &gt;·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write_file</span><span·class="p"·data-group-id="3511760870-14">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="3511760870-14">)</span><span·class="p">.</span><span·class="w">517 &gt;·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write_file</span><span·class="p"·data-group-id="9896141268-14">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·class="p"·data-group-id="9896141268-14">)</span><span·class="p">.</span><span·class="w">
518 </span><span·class="ss">ok</span><span·class="gp·unselectable">518 </span><span·class="ss">ok</span><span·class="gp·unselectable">
519 &gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="3511760870-15">(</span><span·class="s">&quot;escript·demo.escript&quot;</span><span·class="p"·data-group-id="3511760870-15">)</span><span·class="p">.</span><span·class="w">519 &gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="9896141268-15">(</span><span·class="s">&quot;escript·demo.escript&quot;</span><span·class="p"·data-group-id="9896141268-15">)</span><span·class="p">.</span><span·class="w">
520 </span><span·class="s">&quot;3&quot;</span><span·class="gp·unselectable">520 </span><span·class="s">&quot;3&quot;</span><span·class="gp·unselectable">
521 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">extract</span><span·class="p"·data-group-id="3511760870-16">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3511760870-17">[</span><span·class="p"·data-group-id="3511760870-17">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·2e1e0ade54027427927a7d7671bbbb98fda5c5bb414de8856a9e65e9b4bf28f9·...·]-16">)</span><span·class="p">.</span><span·class="w">521 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">extract</span><span·class="p"·data-group-id="9896141268-16">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9896141268-17">[</span><span·class="p"·data-group-id="9896141268-17">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·d6a521231f98142faac7cf7cf94837c05da47bc7419dc50f47c1902dd177b563·...·]-16">)</span><span·class="p">.</span><span·class="w">
522 </span><span·class="p"·data-group-id="3511760870-18">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3511760870-19">[</span><span·class="p"·data-group-id="3511760870-20">{</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="ss">def[·...·truncated·by·diffoscope;·len:·544,·SHA:·981e4a84c0d12ead477069344ed26dfb4e75ee977ba978f9f5cd54f57c0bb3e2·...·]-22">}</span><span·class="p">,</span><span·class="w">522 </span><span·class="p"·data-group-id="9896141268-18">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="9896141268-19">[</span><span·class="p"·data-group-id="9896141268-20">{</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="ss">def[·...·truncated·by·diffoscope;·len:·544,·SHA:·873a049767764302d4181f7188824f4cdd3f429d2c1384d1d761e26f4c3ae413·...·]-22">}</span><span·class="p">,</span><span·class="w">
523 ·····</span><span·class="p"·data-group-id="3511760870-23">{</span><span·class="ss">source</span><span·class="p">,</span><span·class="p"·data-group-id="3511760870-24">&lt;&lt;</span><span·class="s">&quot;%%·Demo\nmain(_Args)·-&gt;\n····io:format(erlang:system_info(schedu&quot;</span><span·class="p">[·...·truncated·by·diffoscope;·len:·568,·SHA:·be200ee0963422c309c7d34ede4f21c1f100c7b242dfae3f48eeed33fa86c237·...·]-1">(</span><span·class="s">&quot;demo.erl&quot;</span><span·class="p">,</span><span·class="w">523 ·····</span><span·class="p"·data-group-id="9896141268-23">{</span><span·class="ss">source</span><span·class="p">,</span><span·class="p"·data-group-id="9896141268-24">&lt;&lt;</span><span·class="s">&quot;%%·Demo\nmain(_Args)·-&gt;\n····io:format(erlang:system_info(schedu&quot;</span><span·class="p">[·...·truncated·by·diffoscope;·len:·568,·SHA:·5f6bcc4652a83e40e4f471b94b1d92d2efdf867381c229be1c6c5104a31932d9·...·]-1">(</span><span·class="s">&quot;demo.erl&quot;</span><span·class="p">,</span><span·class="w">
524 ··················</span><span·class="p"·data-group-id="7453533607-2">[</span><span·class="s">&quot;%%·demo.erl\n-module(demo).\n-export([main/1]).\n\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Source</span><span·class="p"·data-group-id="7453533607-2">]</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·ce5e2d9a3b00bd3440361861783934bad200d6b19cd9973ed05bbb27f5ee0f64·...·]-1">)</span><span·class="p">.</span><span·class="w">524 ··················</span><span·class="p"·data-group-id="0894601431-2">[</span><span·class="s">&quot;%%·demo.erl\n-module(demo).\n-export([main/1]).\n\n&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Source</span><span·class="p"·data-group-id="0894601431-2">]</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·23,·SHA:·9e9d2bd28eb22dcca48ad6c9000b05e23be50a7c4cbf9d4e7596874d3f72b24c·...·]-1">)</span><span·class="p">.</span><span·class="w">
525 </span><span·class="ss">ok</span><span·class="gp·unselectable">525 </span><span·class="ss">ok</span><span·class="gp·unselectable">
526 &gt;·</span><span·class="p"·data-group-id="7453533607-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BeamCode</span><span·class="p"·data-group-id="7453533607-3">}</span><spa[·...·truncated·by·diffoscope;·len:·554,·SHA:·db2ef7b33adb93807520f032cdb6ebe95a962fccdf29bb34492f91cbaf71b36d·...·]-4">)</span><span·class="p">.</span><span·class="w">526 &gt;·</span><span·class="p"·data-group-id="0894601431-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BeamCode</span><span·class="p"·data-group-id="0894601431-3">}</span><spa[·...·truncated·by·diffoscope;·len:·554,·SHA:·116816358afda85c8b780ff28da1624db176bab1a93eab1a12ad79b1b7fa10ed·...·]-4">)</span><span·class="p">.</span><span·class="w">
527 </span><span·class="p"·data-group-id="7453533607-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">demo</span><span·class="p">,</span><span·class="w">527 </span><span·class="p"·data-group-id="0894601431-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">demo</span><span·class="p">,</span><span·class="w">
528 ····</span><span·class="p"·data-group-id="7453533607-7">&lt;&lt;</span><span·class="mi">70</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">49</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">116</span><span·class="p">,</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">528 ····</span><span·class="p"·data-group-id="0894601431-7">&lt;&lt;</span><span·class="mi">70</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">49</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">116</span><span·class="p">,</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
529 ······</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">100</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7453533607-7">&gt;&gt;</span><span·class="p"·data-group-id="7453533607-6">}</span><span·class="gp·unselectable">529 ······</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">100</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0894601431-7">&gt;&gt;</span><span·class="p"·data-group-id="0894601431-6">}</span><span·class="gp·unselectable">
530 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="7453533607-8">(</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7453533607-9">[</span><span·class="p"·data-group-id="7453533607-10">{</span><span·class="ss">beam</span><span·c[·...·truncated·by·diffoscope;·len:·220,·SHA:·0ea06ae5eac3966c6b4025b04ea84b03a08e1dbcfc83ffb666651fa4c936fa18·...·]-8">)</span><span·class="p">.</span><span·class="w">530 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="0894601431-8">(</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0894601431-9">[</span><span·class="p"·data-group-id="0894601431-10">{</span><span·class="ss">beam</span><span·c[·...·truncated·by·diffoscope;·len:·220,·SHA:·0b14ab257735d35db888bf8972879ac23f526bb2db84cd1af9b90d2f2bc674e2·...·]-8">)</span><span·class="p">.</span><span·class="w">
531 </span><span·class="ss">ok</span><span·class="gp·unselectable">531 </span><span·class="ss">ok</span><span·class="gp·unselectable">
532 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">extract</span><span·class="p"·data-group-id="7453533607-11">(</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7453533607-12">[</span><span·class="p"·data-group-id="7453533607-12">]</span><span·class="p"·data-group-id="7453533607-11">)</span><span·class="p">.</span><span·class="w"> 
533 </span><span·class="p"·data-group-id="7453533607-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7453533607-14">[</span><span·class="p"·data-group-id="7453533607-15">{</span><span·class="ss">shebang</span><span·[·...·truncated·by·diffoscope;·len:·611,·SHA:·719763a9cd7512d6e93548b9daf53a2666f94631ba7cb3b8646ccb4b456510f6·...·]</span><span·class="w">532 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">extract</span><span·class="p"·data-group-id="0894601431-11">(</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·167,·SHA:·bc8f9f36f04da7b88c93cf1d15086561b6527afbd3a33ad3c4359d6b8cceefca·...·]</span><span·class="w">
 533 </span><span·class="p"·data-group-id="0894601431-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0894601431-14">[</span><span·class="p"·data-group-id="0894601431-15">{</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="0894601431-15">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0894601431-16">{</span><span·class="ss">comment</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="0894601431-16">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0894601431-17">{</span><span·class="ss">emu_args</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="0894601431-17">}</span><span·class="p">,</span><span·class="w">
534 ·····</span><span·class="p"·data-group-id="7453533607-18">{</span><span·class="ss">beam</span><span·class="p">,</span><span·class="p"·data-group-id="7453533607-19">&lt;&lt;</span><span·class="mi">70</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">49</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">68</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">116</span><span·class="p">,</span><span·class="w">534 ·····</span><span·class="p"·data-group-id="0894601431-18">{</span><span·class="ss">beam</span><span·class="p">,</span><span·class="p"·data-group-id="0894601431-19">&lt;&lt;</span><span·class="mi">70</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">49</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">68</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">116</span><span·class="p">,</span><span·class="w">
535 ·············</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7453533607-19">&gt;&gt;</span><span·class="p"·data-group-id="7453533607-18">}</span><span·class="p"·data-group-id="7453533607-14">]</span><span·class="p"·data-group-id="7453533607-13">}</span><span·class="gp·unselectable">535 ·············</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0894601431-19">&gt;&gt;</span><span·class="p"·data-group-id="0894601431-18">}</span><span·class="p"·data-group-id="0894601431-14">]</span><span·class="p"·data-group-id="0894601431-13">}</span><span·class="gp·unselectable">
536 &gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="7453533607-20">(</span><span·class="s">&quot;escript·demo.beam&quot;</span><span·class="p"·data-group-id="7453533607-20">)</span><span·class="p">.</span><span·class="w">536 &gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">cmd</span><span·class="p"·data-group-id="0894601431-20">(</span><span·class="s">&quot;escript·demo.beam&quot;</span><span·class="p"·data-group-id="0894601431-20">)</span><span·class="p">.</span><span·class="w">
537 </span><span·class="s">&quot;true&quot;</span></code></pre><p>Here·we·create·an·archive·script·containing·both·Erlang·code·and·Beam·code,·then537 </span><span·class="s">&quot;true&quot;</span></code></pre><p>Here·we·create·an·archive·script·containing·both·Erlang·code·and·Beam·code,·then
538 we·iterate·over·all·files·in·the·archive·and·collect·their·contents·and·some538 we·iterate·over·all·files·in·the·archive·and·collect·their·contents·and·some
539 information·about·them:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="3348077419-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SourceCode</span><span·class="p"·data-group-id="3348077419-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·220,·SHA:·7b05d1eb34d53ed5705a6315ca48490e69ff808b2502506fe695f3275df77e67·...·]-2">)</span><span·class="p">.</span><span·class="w">539 information·about·them:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="5325363111-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SourceCode</span><span·class="p"·data-group-id="5325363111-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·220,·SHA:·b3788236a2749112ed6a5afa29bd7e6599043f387ebc8a36f8bc32108c24d8b4·...·]-2">)</span><span·class="p">.</span><span·class="w">
540 </span><span·class="p"·data-group-id="3348077419-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3348077419-4">&lt;&lt;</span><span·class="s">&quot;%%·demo.erl\n-module(demo).\n-export([main/1]).\n\n%%·Demo\nmain(_Arg&quot;</span><span·class="p">.</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·343dd6214ade0276a47ad9b42354088062a69c8de04d2b3a569fda2ad928c5f3·...·]-3">}</span><span·class="gp·unselectable">540 </span><span·class="p"·data-group-id="5325363111-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5325363111-4">&lt;&lt;</span><span·class="s">&quot;%%·demo.erl\n-module(demo).\n-export([main/1]).\n\n%%·Demo\nmain(_Arg&quot;</span><span·class="p">.</s[·...·truncated·by·diffoscope;·len:·153,·SHA:·f2e1f5bcea070368ac6c73fb9b631aa727807f43ce73fdefa855bd24824eb858·...·]-3">}</span><span·class="gp·unselectable">
541 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="3348077419-5">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">541 &gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="5325363111-5">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">
542 ·················</span><span·class="p"·data-group-id="3348077419-6">[</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="w">542 ·················</span><span·class="p"·data-group-id="5325363111-6">[</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="w">
543 ··················</span><span·class="p"·data-group-id="3348077419-7">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3348077419-8">[</span><span·class="p"·data-group-id="3348077419-9">{</span><span·class="s">&quot;demo.erl&quot;</span><span·[·...·truncated·by·diffoscope;·len:·116,·SHA:·f44f90d66a52fa11036826e0698d9da8aa815e4ce0a3c824f70cfad3410aacea·...·]-9">}</span><span·class="p">,</span><span·class="w">543 ··················</span><span·class="p"·data-group-id="5325363111-7">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5325363111-8">[</span><span·class="p"·data-group-id="5325363111-9">{</span><span·class="s">&quot;demo.erl&quot;</span><span·[·...·truncated·by·diffoscope;·len:·116,·SHA:·6dd3401f7f5d05716a1922e71ab0474b0344b6ffac5b750022185e9e3d4f0923·...·]-9">}</span><span·class="p">,</span><span·class="w">
544 ·····························</span><span·class="p"·data-group-id="3348077419-10">{</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BeamCode</span><span·class="p"·data-group-id="3348077419-10">}</span><span·class="p"·data-group-id="3348077419-8">]</span><sp[·...·truncated·by·diffoscope;·len:·300,·SHA:·1df15edda28fe50e11a8d22cedf5de1f35ca3773421e1d328ff1665f4c1852aa·...·]-5">)</span><span·class="p">.</span><span·class="w">544 ·····························</span><span·class="p"·data-group-id="5325363111-10">{</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BeamCode</span><span·class="p"·data-group-id="5325363111-10">}</span><span·class="p"·data-group-id="5325363111-8">]</span><sp[·...·truncated·by·diffoscope;·len:·300,·SHA:·6983366a7d5d6797d6e6e4ac1c7c289f3c4c116416643358feb45c4125b32a97·...·]-5">)</span><span·class="p">.</span><span·class="w">
545 </span><span·class="ss">ok</span><span·class="gp·unselectable">545 </span><span·class="ss">ok</span><span·class="gp·unselectable">
546 &gt;·</span><span·class="p"·data-group-id="3348077419-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3348077419-13">[</span><span·class="p"·data-group-id="3348077419-14">{</span><span·class="ss">shebang</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·565,·SHA:·ab9470444cbf6f1121acff774eba8c4beaf81bff2e360c523c604bbf969d8529·...·]-16">}</span><span·class="p">,</span><span·class="w">546 &gt;·</span><span·class="p"·data-group-id="5325363111-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5325363111-13">[</span><span·class="p"·data-group-id="5325363111-14">{</span><span·class="ss">shebang</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·565,·SHA:·f59e08cb183ef8cebb3b74d197c411596bf4bf23052248c331fcad1f46790f26·...·]-16">}</span><span·class="p">,</span><span·class="w">
547 ·····</span><span·class="p"·data-group-id="3348077419-17">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArchiveBin</span><span·class="p"·data-group-id="3348077419-17">}</span><span·class="p"·data-group-id="3348077419-13">]</span><span·class="[·...·truncated·by·diffoscope;·len:·497,·SHA:·c2e57b191b254b6e1646d9094ecdaa975a5777a2aff3192d5d79a82562010141·...·]-18">)</span><span·class="p">.</span><span·class="w">547 ·····</span><span·class="p"·data-group-id="5325363111-17">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArchiveBin</span><span·class="p"·data-group-id="5325363111-17">}</span><span·class="p"·data-group-id="5325363111-13">]</span><span·class="[·...·truncated·by·diffoscope;·len:·497,·SHA:·3a16e6ee1485d753e0d04059f025d1758c9da1c6e6fecc9fbe3289bba49c6b02·...·]-18">)</span><span·class="p">.</span><span·class="w">
548 </span><span·class="p"·data-group-id="3348077419-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3348077419-21">[</span><span·class="p"·data-group-id="3348077419-22">{</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="ss">def[·...·truncated·by·diffoscope;·len:·541,·SHA:·1b5e4f07c2b8b152b7f92228d94eea1bba4a898597d121e7d9821f7400f71d9b·...·]-24">}</span><span·class="p">,</span><span·class="w">548 </span><span·class="p"·data-group-id="5325363111-20">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5325363111-21">[</span><span·class="p"·data-group-id="5325363111-22">{</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="ss">def[·...·truncated·by·diffoscope;·len:·541,·SHA:·d28345c72566c129a351f2e14fda7be848211ae979370deba65fba5c9eb00deb·...·]-24">}</span><span·class="p">,</span><span·class="w">
549 ·····</span><span·class="p"·data-group-id="3348077419-25">{</span><span·class="p"·data-group-id="3348077419-26">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="p"·data-group-id="3348077419-27">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">105</span><span·class="p">,</span><span·class="w">549 ·····</span><span·class="p"·data-group-id="5325363111-25">{</span><span·class="p"·data-group-id="5325363111-26">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="p"·data-group-id="5325363111-27">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">105</span><span·class="p">,</span><span·class="w">
550 ················</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">61</span><span·class="p">,</span><span·class="mi">93</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3348077419-27">&gt;&gt;</span><span·class="p"·data-group-id="3348077419-26">}</span><span·class="p">]</span><span·class="p"·data-group-id="3348077419-25">}</span><span·class="gp·unselectable">550 ················</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">61</span><span·class="p">,</span><span·class="mi">93</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5325363111-27">&gt;&gt;</span><span·class="p"·data-group-id="5325363111-26">}</span><span·class="p">]</span><span·class="p"·data-group-id="5325363111-25">}</span><span·class="gp·unselectable">
551 &gt;·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write_file</span><span·class="p"·data-group-id="3348077419-28">(</span><span·class="s">&quot;demo.zip&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArchiveBin</span><span·class="p"·data-group-id="3348077419-28">)</span><span·class="p">.</span><span·class="w">551 &gt;·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write_file</span><span·class="p"·data-group-id="5325363111-28">(</span><span·class="s">&quot;demo.zip&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArchiveBin</span><span·class="p"·data-group-id="5325363111-28">)</span><span·class="p">.</span><span·class="w">
552 </span><span·class="ss">ok</span><span·class="gp·unselectable">552 </span><span·class="ss">ok</span><span·class="gp·unselectable">
553 &gt;·</span><span·class="nc">zip</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="3348077419-29">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3348077419-30">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">I</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·1252,·SHA:·cc7af05b19668bde4d83565d998afaaae8ae58a357bf70e4b56317a29bd30bd2·...·]-29">)</span><span·class="p">.</span><span·class="w">553 &gt;·</span><span·class="nc">zip</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="5325363111-29">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="5325363111-30">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">I</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·1252,·SHA:·d9763253bd9d94322f319b82edc8aaf842166cdffd010414a96c4f508999255d·...·]-29">)</span><span·class="p">.</span><span·class="w">
554 </span><span·class="p"·data-group-id="3348077419-36">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3348077419-37">[</span><span·class="p"·data-group-id="3348077419-38">{</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">554 </span><span·class="p"·data-group-id="5325363111-36">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5325363111-37">[</span><span·class="p"·data-group-id="5325363111-38">{</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">
555 ······</span><span·class="p"·data-group-id="3348077419-39">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">748</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">555 ······</span><span·class="p"·data-group-id="5325363111-39">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">748</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">
556 ·················</span><span·class="p"·data-group-id="3348077419-40">{</span><span·class="p"·data-group-id="3348077419-41">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3348077419-41">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·b96d1475856098f9cf2813283e9d72b1b6715a2ec97cab41ae9024aa53c01e49·...·]-40">}</span><span·class="p">,</span><span·class="w">556 ·················</span><span·class="p"·data-group-id="5325363111-40">{</span><span·class="p"·data-group-id="5325363111-41">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5325363111-41">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·d3873c15a2c95882524743fa8984ef1e8bf9be7d21b11579fd6cfa4e1b29d893·...·]-40">}</span><span·class="p">,</span><span·class="w">
557 ·················</span><span·class="p"·data-group-id="3348077419-43">{</span><span·class="p"·data-group-id="3348077419-44">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3348077419-44">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·b41e9ed0dd5be73b582c16596ad2a2b4f3e446cb190a956454ff103a658c0684·...·]-43">}</span><span·class="p">,</span><span·class="w">557 ·················</span><span·class="p"·data-group-id="5325363111-43">{</span><span·class="p"·data-group-id="5325363111-44">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5325363111-44">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·8fa1f5a95d7f050d84042e94a6b16fc3fdd0ba66f7cfd1526d2925a5646a13a2·...·]-43">}</span><span·class="p">,</span><span·class="w">
558 ·················</span><span·class="p"·data-group-id="3348077419-46">{</span><span·class="p"·data-group-id="3348077419-47">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3348077419-47">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·2d1684ea575f3fa268a7ad88932a39d7c9f74b1940f535caf4af0f141f8ca81b·...·]-46">}</span><span·class="p">,</span><span·class="w">558 ·················</span><span·class="p"·data-group-id="5325363111-46">{</span><span·class="p"·data-group-id="5325363111-47">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5325363111-47">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·c6c05bbd5bc405d64c0402dbf4db602ed423a456f30b47d1aa56c551af44830e·...·]-46">}</span><span·class="p">,</span><span·class="w">
559 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="3348077419-39">}</span><span·class="p">,</span><span·class="w">559 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5325363111-39">}</span><span·class="p">,</span><span·class="w">
560 ······</span><span·class="p"·data-group-id="3348077419-49">&lt;&lt;</span><span·class="mi">70</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">49</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">228</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">116</span><span·class="p">,</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">560 ······</span><span·class="p"·data-group-id="5325363111-49">&lt;&lt;</span><span·class="mi">70</span><span·class="p">,</span><span·class="mi">79</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">49</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">228</span><span·class="p">,</span><span·class="mi">66</span><span·class="p">,</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">77</span><span·class="p">,</span><span·class="mi">65</span><span·class="p">,</span><span·class="mi">116</span><span·class="p">,</span><span·class="mi">111</span><span·class="p">,</span><span·class="mi">109</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
561 ········</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3348077419-49">&gt;&gt;</span><span·class="p"·data-group-id="3348077419-38">}</span><span·class="p">,</span><span·class="w">561 ········</span><span·class="mi">83</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5325363111-49">&gt;&gt;</span><span·class="p"·data-group-id="5325363111-38">}</span><span·class="p">,</span><span·class="w">
562 ·····</span><span·class="p"·data-group-id="3348077419-50">{</span><span·class="s">&quot;demo.erl&quot;</span><span·class="p">,</span><span·class="w">562 ·····</span><span·class="p"·data-group-id="5325363111-50">{</span><span·class="s">&quot;demo.erl&quot;</span><span·class="p">,</span><span·class="w">
563 ······</span><span·class="p"·data-group-id="3348077419-51">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">563 ······</span><span·class="p"·data-group-id="5325363111-51">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">
564 ·················</span><span·class="p"·data-group-id="3348077419-52">{</span><span·class="p"·data-group-id="3348077419-53">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3348077419-53">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·c50c6de319011b9e8774b3a552e8a2f06c0324d41fe40bf01d18411d981b62c7·...·]-52">}</span><span·class="p">,</span><span·class="w">564 ·················</span><span·class="p"·data-group-id="5325363111-52">{</span><span·class="p"·data-group-id="5325363111-53">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5325363111-53">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·6d66ee9d0cff2dc0a360adff55008663633ccdfbea8e8cf6fce3edbfc693cd0b·...·]-52">}</span><span·class="p">,</span><span·class="w">
565 ·················</span><span·class="p"·data-group-id="3348077419-55">{</span><span·class="p"·data-group-id="3348077419-56">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3348077419-56">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·530bab337a1f04faba1905cc6ce41f27f27909eab449065c2c30343d0948d1b3·...·]-55">}</span><span·class="p">,</span><span·class="w">565 ·················</span><span·class="p"·data-group-id="5325363111-55">{</span><span·class="p"·data-group-id="5325363111-56">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5325363111-56">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·23bcc4d19b406c0643eb782413874c1fcaa79ed1e634484db6b3aa6322ad2edb·...·]-55">}</span><span·class="p">,</span><span·class="w">
566 ·················</span><span·class="p"·data-group-id="3348077419-58">{</span><span·class="p"·data-group-id="3348077419-59">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3348077419-59">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·beb6070af9305155eacc79edfa1753f80be8557b4e2ae42d554cc19bf2fccf85·...·]-58">}</span><span·class="p">,</span><span·class="w">566 ·················</span><span·class="p"·data-group-id="5325363111-58">{</span><span·class="p"·data-group-id="5325363111-59">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5325363111-59">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·5f209f944b3b8500a1075fd4a5b43ab2f86e25c606d15fe5dfd0c17318ef923f·...·]-58">}</span><span·class="p">,</span><span·class="w">
567 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="3348077419-51">}</span><span·class="p">,</span><span·class="w">567 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5325363111-51">}</span><span·class="p">,</span><span·class="w">
568 ······</span><span·class="p"·data-group-id="3348077419-61">&lt;&lt;</span><span·class="s">&quot;%%·demo.erl\n-module(demo).\n-export([main/1]).\n\n%%·Demo\nmain(_Arg&quot;</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3348077419-61">&gt;[·...·truncated·by·diffoscope;·len:·160,·SHA:·2f68a13d5d970ac5f0465a4adbf9d843bca031eeb4b25ef6534a56516df8309f·...·]-36">}</span></code></pre>568 ······</span><span·class="p"·data-group-id="5325363111-61">&lt;&lt;</span><span·class="s">&quot;%%·demo.erl\n-module(demo).\n-export([main/1]).\n\n%%·Demo\nmain(_Arg&quot;</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5325363111-61">&gt;[·...·truncated·by·diffoscope;·len:·160,·SHA:·81306a53aeaa782d18a23a1d4ea6d4b655bd4abdb25644d281fc1cf206327233·...·]-36">}</span></code></pre>
569 ··</section>569 ··</section>
570 </section>570 </section>
571 <section·class="detail"·id="extract/2">571 <section·class="detail"·id="extract/2">
  
572 ··<div·class="detail-header">572 ··<div·class="detail-header">
573 ····<a·href="#extract/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">573 ····<a·href="#extract/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
574 ······<i·class="ri-link-m"·aria-hidden="true"></i>574 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 593, 24 lines modifiedOffset 593, 24 lines modified
593 ······</div>593 ······</div>
  
594 <p>Parses·an·escript·and·extracts·its·sections.·This·is·the·reverse·of·<a·href="#create/2"><code·class="inline">create/2</code></a>.</p><p>All·sections·are·returned·even·if·they·do·not·exist·in·the·escript.·If·a594 <p>Parses·an·escript·and·extracts·its·sections.·This·is·the·reverse·of·<a·href="#create/2"><code·class="inline">create/2</code></a>.</p><p>All·sections·are·returned·even·if·they·do·not·exist·in·the·escript.·If·a
595 particular·section·happens·to·have·the·same·value·as·the·default·value,·the595 particular·section·happens·to·have·the·same·value·as·the·default·value,·the
596 extracted·value·is·set·to·the·atom·<code·class="inline">default</code>.·If·a·section·is·missing,·the596 extracted·value·is·set·to·the·atom·<code·class="inline">default</code>.·If·a·section·is·missing,·the
597 extracted·value·is·set·to·the·atom·<code·class="inline">undefined</code>.</p><p>Option·<code·class="inline">compile_source</code>·only·affects·the·result·if·the·escript·contains·<code·class="inline">source</code>597 extracted·value·is·set·to·the·atom·<code·class="inline">undefined</code>.</p><p>Option·<code·class="inline">compile_source</code>·only·affects·the·result·if·the·escript·contains·<code·class="inline">source</code>
598 code.·In·this·case·the·Erlang·code·is·automatically·compiled·and598 code.·In·this·case·the·Erlang·code·is·automatically·compiled·and
599 <code·class="inline">{source,·BeamCode}</code>·is·returned·instead·of·<code·class="inline">{source,·SourceCode}</code>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="0782661851-1">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">599 <code·class="inline">{source,·BeamCode}</code>·is·returned·instead·of·<code·class="inline">{source,·SourceCode}</code>.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">create</span><span·class="p"·data-group-id="3044485967-1">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">
600 ·················</span><span·class="p"·data-group-id="0782661851-2">[</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0782661851-3">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·248,·SHA:·88e32fd70333959f5234b08d7374e369944a11ee375c1fbc6acd4023ebe84004·...·]-5">}</span><span·class="p">,</span><span·class="w">600 ·················</span><span·class="p"·data-group-id="3044485967-2">[</span><span·class="ss">shebang</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3044485967-3">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·248,·SHA:·624b022ddfa16c781180a5d4afc2b0c03c04a26c16c172e7f0a347b198090f1a·...·]-5">}</span><span·class="p">,</span><span·class="w">
601 ······································</span><span·class="p"·data-group-id="0782661851-6">{</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BeamCode</span><span·class="p"·data-group-id="0782661851-6">}</span><span·class="p"·data-group-id="0782661851-4">]</span><span[·...·truncated·by·diffoscope;·len:·296,·SHA:·03bd6c6342ea0f74ea0277160e04dcba5c5edc4a9ad99fceb09fd93875c5b81f·...·]-1">)</span><span·class="p">.</span><span·class="w">601 ······································</span><span·class="p"·data-group-id="3044485967-6">{</span><span·class="s">&quot;demo.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">BeamCode</span><span·class="p"·data-group-id="3044485967-6">}</span><span·class="p"·data-group-id="3044485967-4">]</span><span[·...·truncated·by·diffoscope;·len:·296,·SHA:·92d2b5d8a55978df815dff60113b82eb2ef8467186206185c4242059bc6d2d85·...·]-1">)</span><span·class="p">.</span><span·class="w">
602 </span><span·class="ss">ok</span><span·class="gp·unselectable">602 </span><span·class="ss">ok</span><span·class="gp·unselectable">
603 &gt;·</span><span·class="p"·data-group-id="0782661851-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0782661851-9">[</span><span·class="p"·data-group-id="0782661851-10">{</span><span·class="ss">shebang</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·563,·SHA:·b321923229e3eb733b9d776624ce1b36f2924e2af1b9700c5156c647e628ff74·...·]-12">}</span><span·class="p">,</span><span·class="w">603 &gt;·</span><span·class="p"·data-group-id="3044485967-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3044485967-9">[</span><span·class="p"·data-group-id="3044485967-10">{</span><span·class="ss">shebang</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·563,·SHA:·78cf77b79d3c53fc8d45a7d30b9e6f532e149b2e73db0b89f8ece898dc62ffe7·...·]-12">}</span><span·class="p">,</span><span·class="w">
604 ·····</span><span·class="p"·data-group-id="0782661851-13">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArchiveBin</span><span·class="p"·data-group-id="0782661851-13">}</span><span·class="p"·data-group-id="0782661851-9">]</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·16268fdca15943dba1ab471696b2b6b5aadf6846b340eaa5e27f5387e33b1196·...·]-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">604 ·····</span><span·class="p"·data-group-id="3044485967-13">{</span><span·class="ss">archive</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ArchiveBin</span><span·class="p"·data-group-id="3044485967-13">}</span><span·class="p"·data-group-id="3044485967-9">]</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·7c9052118fd45e742124e1632ed722b6c31696411c0979e2f6eb31c82aece138·...·]-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
605 ··············</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">extract</span><span·class="p"·data-group-id="0782661851-14">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0782661851-15">[</span><span·class="p"·data-group-id="0782661851-15">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·af3943f86ae7a2fba2987704687000193f4c24fc3ff3ff3453b78259b3a13534·...·]-14">)</span><span·class="p">.</span><span·class="w">605 ··············</span><span·class="nc">escript</span><span·class="p">:</span><span·class="nf">extract</span><span·class="p"·data-group-id="3044485967-14">(</span><span·class="s">&quot;demo.escript&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3044485967-15">[</span><span·class="p"·data-group-id="3044485967-15">]</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·72c914cf935106e9f2f48098788b8428704a0a367b340200405f858583b52cbc·...·]-14">)</span><span·class="p">.</span><span·class="w">
606 </span><span·class="p"·data-group-id="0782661851-16">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0782661851-17">[</span><span·class="p"·data-group-id="0782661851-18">{</span><span·class="p"·data-group-id="0782661851-19">{</span><span·class="ss">arch[·...·truncated·by·diffoscope;·len:·75,·SHA:·b019d7b3ae46e435063a08ec3022bd7629bbe08ad99f0ef9545fa645fd37bf66·...·]-20">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">105</span><span·class="p">,</span><span·class="w">606 </span><span·class="p"·data-group-id="3044485967-16">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3044485967-17">[</span><span·class="p"·data-group-id="3044485967-18">{</span><span·class="p"·data-group-id="3044485967-19">{</span><span·class="ss">arch[·...·truncated·by·diffoscope;·len:·75,·SHA:·bb1af23b69795c9e61fe1e134b0a4ce0d0a3f1a506ea44cb416408311029dbd6·...·]-20">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">7</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">105</span><span·class="p">,</span><span·class="w">
607 ················</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">61</span><span·class="p">,</span><span·class="mi">93</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0782661851-20">&gt;&gt;</span><span·class="p"·data-group-id="0782661851-19">}</span><span·class="w">607 ················</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">61</span><span·class="p">,</span><span·class="mi">93</span><span·class="p">,</span><span·class="mi">107</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">118</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3044485967-20">&gt;&gt;</span><span·class="p"·data-group-id="3044485967-19">}</span><span·class="w">
608 ·····</span><span·class="p"·data-group-id="0782661851-21">{</span><span·class="ss">emu_args</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="0782661851-21">}</span><span·class="p">]</span><span·class="p"·data-group-id="0782661851-18">}</span></code></pre>608 ·····</span><span·class="p"·data-group-id="3044485967-21">{</span><span·class="ss">emu_args</span><span·class="p">,</span><span·class="ss">undefined</span><span·class="p"·data-group-id="3044485967-21">}</span><span·class="p">]</span><span·class="p"·data-group-id="3044485967-18">}</span></code></pre>
609 ··</section>609 ··</section>
610 </section>610 </section>
611 <section·class="detail"·id="script_name/0">611 <section·class="detail"·id="script_name/0">
  
612 ··<div·class="detail-header">612 ··<div·class="detail-header">
613 ····<a·href="#script_name/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">613 ····<a·href="#script_name/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
614 ······<i·class="ri-link-m"·aria-hidden="true"></i>614 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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658 ······<p·class="built-using">658 ······<p·class="built-using">
659 ········Built·using659 ········Built·using
660 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the660 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
661 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>661 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
662 ······</p>662 ······</p>
663 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>663 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
664 ····</footer>664 ····</footer>
665 ··</div>665 ··</div>
666 </main>666 </main>
667 </div>667 </div>
668 <script>668 <script>
669 ··function·mermaidLoaded()·{669 ··function·mermaidLoaded()·{
670 ····mermaid.initialize({670 ····mermaid.initialize({
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216 disallow·concurrent·updates·during·the·entire·traversal.</p><p>Moreover,·traversals·not·done·in·a·<em>safe</em>·way,·on·tables·where·keys·are·inserted216 disallow·concurrent·updates·during·the·entire·traversal.</p><p>Moreover,·traversals·not·done·in·a·<em>safe</em>·way,·on·tables·where·keys·are·inserted
217 or·deleted·during·the·traversal,·may·yield·the·following·undesired·effects:</p><ul><li>Any·key·may·be·missed.</li><li>Any·key·may·be·found·more·than·once.</li><li>The·traversal·may·fail·with·<code·class="inline">badarg</code>·exception·if·keys·are·deleted.</li></ul><p>A·table·traversal·is·<em>safe</em>·if·either</p><ul><li>the·table·is·of·type·<code·class="inline">ordered_set</code>.</li><li>the·entire·table·traversal·is·done·within·one·ETS·function·call.</li><li>function·<a·href="#safe_fixtable/2"><code·class="inline">safe_fixtable/2</code></a>·is·used·to·keep·the·table·fixated·during·the·entire217 or·deleted·during·the·traversal,·may·yield·the·following·undesired·effects:</p><ul><li>Any·key·may·be·missed.</li><li>Any·key·may·be·found·more·than·once.</li><li>The·traversal·may·fail·with·<code·class="inline">badarg</code>·exception·if·keys·are·deleted.</li></ul><p>A·table·traversal·is·<em>safe</em>·if·either</p><ul><li>the·table·is·of·type·<code·class="inline">ordered_set</code>.</li><li>the·entire·table·traversal·is·done·within·one·ETS·function·call.</li><li>function·<a·href="#safe_fixtable/2"><code·class="inline">safe_fixtable/2</code></a>·is·used·to·keep·the·table·fixated·during·the·entire
218 traversal.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Even·though·the·access·of·a·single·object·is·always·guaranteed·to·be218 traversal.</li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Even·though·the·access·of·a·single·object·is·always·guaranteed·to·be
219 <a·href="ets.html#module-concurrency">atomic·and·isolated</a>,·each·traversal·through·a·table·to219 <a·href="ets.html#module-concurrency">atomic·and·isolated</a>,·each·traversal·through·a·table·to
220 find·the·next·key·is·not·done·with·such·guarantees.·This·is·often·not·a220 find·the·next·key·is·not·done·with·such·guarantees.·This·is·often·not·a
221 problem,·but·may·cause·rare·subtle·&quot;unexpected&quot;·effects·if·a·concurrent221 problem,·but·may·cause·rare·subtle·&quot;unexpected&quot;·effects·if·a·concurrent
222 process·inserts·objects·during·a·traversal.·For·example,·consider·one·process222 process·inserts·objects·during·a·traversal.·For·example,·consider·one·process
223 doing</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="0308897663-1">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0308897663-2">[</span><span·class="ss">ordered_set</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">named_ta[·...·truncated·by·diffoscope;·len:·104,·SHA:·6f8133480782b1e1dde9f45be4dd3854549edebc94d6006aa698bdd889fab6b7·...·]-1">)</span><span·class="p">,</span><span·class="w">223 doing</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="9924200771-1">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9924200771-2">[</span><span·class="ss">ordered_set</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">named_ta[·...·truncated·by·diffoscope;·len:·104,·SHA:·ffbe51c76c32b980fa450988e8dafa8e869e9a002c63bd9238a50fd61f693302·...·]-1">)</span><span·class="p">,</span><span·class="w">
224 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="0308897663-3">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0308897663-4">{</span><span·class="mi">1</span><span·class="p"·data-group-id="0308897663-4">}</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·60fe3756d173ec52f495b55aced9f86657bcc8676d7973f9daf176b1dde2c2ad·...·]-3">)</span><span·class="p">,</span><span·class="w">224 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="9924200771-3">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9924200771-4">{</span><span·class="mi">1</span><span·class="p"·data-group-id="9924200771-4">}</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·8e5fdc796b2ee08c43925d7d03aa25a870985675150dca3115deb871ecafa633·...·]-3">)</span><span·class="p">,</span><span·class="w">
225 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="0308897663-5">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0308897663-6">{</span><span·class="mi">2</span><span·class="p"·data-group-id="0308897663-6">}</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·60fe3756d173ec52f495b55aced9f86657bcc8676d7973f9daf176b1dde2c2ad·...·]-5">)</span><span·class="p">,</span><span·class="w">225 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="9924200771-5">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9924200771-6">{</span><span·class="mi">2</span><span·class="p"·data-group-id="9924200771-6">}</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·8e5fdc796b2ee08c43925d7d03aa25a870985675150dca3115deb871ecafa633·...·]-5">)</span><span·class="p">,</span><span·class="w">
226 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="0308897663-7">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0308897663-8">{</span><span·class="mi">3</span><span·class="p"·data-group-id="0308897663-8">}</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·60fe3756d173ec52f495b55aced9f86657bcc8676d7973f9daf176b1dde2c2ad·...·]-7">)</span><span·class="p">,</span></code></pre><p>A·concurrent·call·to·<code·class="inline">ets:first(t)</code>,·done·by·another·process,·may·then·in·rare226 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">insert</span><span·class="p"·data-group-id="9924200771-7">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9924200771-8">{</span><span·class="mi">3</span><span·class="p"·data-group-id="9924200771-8">}</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·8e5fdc796b2ee08c43925d7d03aa25a870985675150dca3115deb871ecafa633·...·]-7">)</span><span·class="p">,</span></code></pre><p>A·concurrent·call·to·<code·class="inline">ets:first(t)</code>,·done·by·another·process,·may·then·in·rare
227 cases·return·<code·class="inline">2</code>·even·though·<code·class="inline">2</code>·has·never·existed·in·the·table·ordered·as·the227 cases·return·<code·class="inline">2</code>·even·though·<code·class="inline">2</code>·has·never·existed·in·the·table·ordered·as·the
228 first·key.·In·the·same·way,·a·concurrent·call·to·<code·class="inline">ets:next(t,·1)</code>·may·return228 first·key.·In·the·same·way,·a·concurrent·call·to·<code·class="inline">ets:next(t,·1)</code>·may·return
229 <code·class="inline">3</code>·even·though·<code·class="inline">3</code>·never·existed·in·the·table·ordered·directly·after·<code·class="inline">1</code>.</p><p>Effects·like·this·are·improbable·but·possible.·The·probability·will·further·be229 <code·class="inline">3</code>·even·though·<code·class="inline">3</code>·never·existed·in·the·table·ordered·directly·after·<code·class="inline">1</code>.</p><p>Effects·like·this·are·improbable·but·possible.·The·probability·will·further·be
230 reduced·(if·not·vanish)·if·table·option230 reduced·(if·not·vanish)·if·table·option
231 <a·href="ets.html#new_2_write_concurrency"><code·class="inline">write_concurrency</code></a>·is·not·enabled.·This231 <a·href="ets.html#new_2_write_concurrency"><code·class="inline">write_concurrency</code></a>·is·not·enabled.·This
232 can·also·only·be·a·potential·concern·for·<code·class="inline">ordered_set</code>·where·the·traversal232 can·also·only·be·a·potential·concern·for·<code·class="inline">ordered_set</code>·where·the·traversal
233 order·is·defined.</p></section><p>Traversals·using·<code·class="inline">match</code>·and·<code·class="inline">select</code>·functions·may·not·need·to·scan·the·entire233 order·is·defined.</p></section><p>Traversals·using·<code·class="inline">match</code>·and·<code·class="inline">select</code>·functions·may·not·need·to·scan·the·entire
234 table·depending·on·how·the·key·is·specified.·A·match·pattern·with·a·<em>fully·bound234 table·depending·on·how·the·key·is·specified.·A·match·pattern·with·a·<em>fully·bound
235 key</em>·(without·any·match·variables)·will·optimize·the·operation·to·a·single·key235 key</em>·(without·any·match·variables)·will·optimize·the·operation·to·a·single·key
236 lookup·without·any·table·traversal·at·all.·For·<code·class="inline">ordered_set</code>·a·<em>partially·bound236 lookup·without·any·table·traversal·at·all.·For·<code·class="inline">ordered_set</code>·a·<em>partially·bound
237 key</em>·will·limit·the·traversal·to·only·scan·a·subset·of·the·table·based·on·term237 key</em>·will·limit·the·traversal·to·only·scan·a·subset·of·the·table·based·on·term
238 order.·A·partially·bound·key·is·either·a·list·or·a·tuple·with·a·prefix·that·is238 order.·A·partially·bound·key·is·either·a·list·or·a·tuple·with·a·prefix·that·is
239 fully·bound.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">T</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="9832824005-1">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="p"·data-group-id="9832824005-2">[</span><span·class="ss">ordered_set</span><span·class="p"·data-group-id="9832824005-2">]</span><span·class="p"·data-group-id="9832824005-1"[·...·truncated·by·diffoscope;·len:·546,·SHA:·eab8d7906197870307babd636154abcd9537b5497d0e236283d691f189378d88·...·]-3">)</span><span·class="p">.</span><span·class="w">239 fully·bound.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">T</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="1965407308-1">(</span><span·class="ss">t</span><span·class="p">,</span><span·class="p"·data-group-id="1965407308-2">[</span><span·class="ss">ordered_set</span><span·class="p"·data-group-id="1965407308-2">]</span><span·class="p"·data-group-id="1965407308-1"[·...·truncated·by·diffoscope;·len:·546,·SHA:·ddef120bd21f5cd2933d9e5314b2d75711a5663051f9495338ea2a56e5c7b3bb·...·]-3">)</span><span·class="p">.</span><span·class="w">
240 </span><span·class="ss">true</span><span·class="gp·unselectable">240 </span><span·class="ss">true</span><span·class="gp·unselectable">
241 2&gt;·</span><span·class="c1">%%·Efficient·search·of·all·with·area·code·555</span><span·class="gp·unselectable">241 2&gt;·</span><span·class="c1">%%·Efficient·search·of·all·with·area·code·555</span><span·class="gp·unselectable">
242 2&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="9832824005-5">(</span><span·class="n">T</span><span·class="p">,</span><span·class="p"·data-group-id="9832824005-6">{</span><span·class="p"·data-group-id="9832824005-7">[</span><span·class="sc">$5</span><span·class="p">,</span><span·class="sc">$5</span><spa[·...·truncated·by·diffoscope;·len:·387,·SHA:·ba71cd0dd91faf07ec43129f327a8a51969904b65bc62b0aaa9fd55b29f9c3b5·...·]-5">)</span><span·class="p">.</span><span·class="w">242 2&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="1965407308-5">(</span><span·class="n">T</span><span·class="p">,</span><span·class="p"·data-group-id="1965407308-6">{</span><span·class="p"·data-group-id="1965407308-7">[</span><span·class="sc">$5</span><span·class="p">,</span><span·class="sc">$5</span><spa[·...·truncated·by·diffoscope;·len:·387,·SHA:·2dd7498a2ecfe598651b097c4213e5003539089adae9a9beb679391607b243c6·...·]-5">)</span><span·class="p">.</span><span·class="w">
243 </span><span·class="p"·data-group-id="9832824005-8">[</span><span·class="p"·data-group-id="9832824005-9">[</span><span·class="s">&quot;1234&quot;</span><span·class="p">,</span><span·class="s">&quot;John·Smith&quot;</span><span·class="p"·data-group-id="9832824005-9">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·004fc1b972f83d60068181d3b47029e25e79556bd9f97b49bb91300469e61add·...·]-8">]</span></code></pre><p><a·href=""·id="match_spec"></a></p><h2·id="module-match-specifications"·class="section-heading">243 </span><span·class="p"·data-group-id="1965407308-8">[</span><span·class="p"·data-group-id="1965407308-9">[</span><span·class="s">&quot;1234&quot;</span><span·class="p">,</span><span·class="s">&quot;John·Smith&quot;</span><span·class="p"·data-group-id="1965407308-9">]</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·21,·SHA:·daa83dbec0ccbc41b4e8e495bc6654c67e00df6e23e5bd14e72cb10b259b67ea·...·]-8">]</span></code></pre><p><a·href=""·id="match_spec"></a></p><h2·id="module-match-specifications"·class="section-heading">
244 ··<a·href="#module-match-specifications"·class="hover-link">244 ··<a·href="#module-match-specifications"·class="hover-link">
245 ····<i·class="ri-link-m"·aria-hidden="true"></i>245 ····<i·class="ri-link-m"·aria-hidden="true"></i>
246 ··</a>246 ··</a>
247 ··<span·class="text">Match·Specifications</span>247 ··<span·class="text">Match·Specifications</span>
248 </h2>248 </h2>
249 <p>Some·of·the·functions·use·a·<em>match·specification</em>,·<code·class="inline">match_spec</code>.·For·a·brief249 <p>Some·of·the·functions·use·a·<em>match·specification</em>,·<code·class="inline">match_spec</code>.·For·a·brief
250 explanation,·see·<a·href="#select/2"><code·class="inline">select/2</code></a>.·For·a·detailed·description,·see·section250 explanation,·see·<a·href="#select/2"><code·class="inline">select/2</code></a>.·For·a·detailed·description,·see·section
Offset 1886, 27 lines modifiedOffset 1886, 27 lines modified
1886 function.</p><p>The·parse·transform·is·provided·in·the·<code·class="inline">ms_transform</code>·module·and·the·source1886 function.</p><p>The·parse·transform·is·provided·in·the·<code·class="inline">ms_transform</code>·module·and·the·source
1887 <em>must</em>·include·file·<code·class="inline">ms_transform.hrl</code>·in·STDLIB·for·this·pseudo·function·to1887 <em>must</em>·include·file·<code·class="inline">ms_transform.hrl</code>·in·STDLIB·for·this·pseudo·function·to
1888 work.·Failing·to·include·the·hrl·file·in·the·source·results·in·a·runtime·error,1888 work.·Failing·to·include·the·hrl·file·in·the·source·results·in·a·runtime·error,
1889 not·a·compile·time·error.·The·include·file·is·easiest·included·by·adding·line1889 not·a·compile·time·error.·The·include·file·is·easiest·included·by·adding·line
1890 <code·class="inline">-include_lib(&quot;stdlib/include/ms_transform.hrl&quot;).</code>·to·the·source·file.</p><p>The·fun·is·very·restricted,·it·can·take·only·a·single·parameter·(the·object·to1890 <code·class="inline">-include_lib(&quot;stdlib/include/ms_transform.hrl&quot;).</code>·to·the·source·file.</p><p>The·fun·is·very·restricted,·it·can·take·only·a·single·parameter·(the·object·to
1891 match):·a·sole·variable·or·a·tuple.·It·must·use·the·<code·class="inline">is_</code>·guard·tests.·Language1891 match):·a·sole·variable·or·a·tuple.·It·must·use·the·<code·class="inline">is_</code>·guard·tests.·Language
1892 constructs·that·have·no·representation·in·a·match·specification·(<code·class="inline">if</code>,·<code·class="inline">case</code>,1892 constructs·that·have·no·representation·in·a·match·specification·(<code·class="inline">if</code>,·<code·class="inline">case</code>,
1893 <code·class="inline">receive</code>,·and·so·on)·are·not·allowed.</p><p>The·return·value·is·the·resulting·match·specification.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="5856427502-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="5856427502-2">(</span><span·class="p"·data-group-id="5856427502-3">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·467,·SHA:·e8e9a684cdd82c1e72ac2bb2431b5e9591ad5da220dd3f41c17a17facd124954·...·]-1">)</span><span·class="p">.</span><span·class="w">1893 <code·class="inline">receive</code>,·and·so·on)·are·not·allowed.</p><p>The·return·value·is·the·resulting·match·specification.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="0741161459-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0741161459-2">(</span><span·class="p"·data-group-id="0741161459-3">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·467,·SHA:·249349cd38862a19e30b59345a76366f1c106c31e4568987e491e08cdbaffb67·...·]-1">)</span><span·class="p">.</span><span·class="w">
1894 </span><span·class="p"·data-group-id="5856427502-4">[</span><span·class="p"·data-group-id="5856427502-5">{</span><span·class="p"·data-group-id="5856427502-6">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="5[·...·truncated·by·diffoscope;·len:·664,·SHA:·8a06509edcf0888e0e3068604706e64f25bbcd771f75327f61a6b1d70a228311·...·]-4">]</span></code></pre><p>Variables·from·the·environment·can·be·imported,·so·that·the·following·works:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">X</span><span·class="o">=</span><span·class="mi">3</span><span·class="p">.</span><span·class="w">1894 </span><span·class="p"·data-group-id="0741161459-4">[</span><span·class="p"·data-group-id="0741161459-5">{</span><span·class="p"·data-group-id="0741161459-6">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="0[·...·truncated·by·diffoscope;·len:·664,·SHA:·f8a8cd986290654163cbaf5b8159f10671a4e32418e0c1ebd3a8a0262a19c5f2·...·]-4">]</span></code></pre><p>Variables·from·the·environment·can·be·imported,·so·that·the·following·works:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">X</span><span·class="o">=</span><span·class="mi">3</span><span·class="p">.</span><span·class="w">
1895 </span><span·class="mi">3</span><span·class="gp·unselectable">1895 </span><span·class="mi">3</span><span·class="gp·unselectable">
1896 3&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="3202076652-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3202076652-2">(</span><span·class="p"·data-group-id="3202076652-3">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·466,·SHA:·9d1058a86fb0c1c50fc4d140b56f6813feace4ca6231dd1c0d10ee8b3a7a5f3b·...·]-1">)</span><span·class="p">.</span><span·class="w">1896 3&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="7030260186-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7030260186-2">(</span><span·class="p"·data-group-id="7030260186-3">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·466,·SHA:·b937222f706c09f84660a32f16b359780452764295ba95d733ce732c7aa6958b·...·]-1">)</span><span·class="p">.</span><span·class="w">
1897 </span><span·class="p"·data-group-id="3202076652-4">[</span><span·class="p"·data-group-id="3202076652-5">{</span><span·class="p"·data-group-id="3202076652-6">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="3[·...·truncated·by·diffoscope;·len:·825,·SHA:·1fde32ddeda5b8e450decd664fcbf6b421d9081a1c48d18f5dc7dd0ab9fe9476·...·]-4">]</span></code></pre><p>The·imported·variables·are·replaced·by·match·specification·<code·class="inline">const</code>·expressions,1897 </span><span·class="p"·data-group-id="7030260186-4">[</span><span·class="p"·data-group-id="7030260186-5">{</span><span·class="p"·data-group-id="7030260186-6">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id="7[·...·truncated·by·diffoscope;·len:·825,·SHA:·8df6e412bafeb9ad7995861dc35de7d55d5fef35cfa8bc4bec08a153a1e306b0·...·]-4">]</span></code></pre><p>The·imported·variables·are·replaced·by·match·specification·<code·class="inline">const</code>·expressions,
1898 which·is·consistent·with·the·static·scoping·for·Erlang·funs.·However,·local·or1898 which·is·consistent·with·the·static·scoping·for·Erlang·funs.·However,·local·or
1899 global·function·calls·cannot·be·in·the·guard·or·body·of·the·fun.·Calls·to1899 global·function·calls·cannot·be·in·the·guard·or·body·of·the·fun.·Calls·to
1900 built-in·match·specification·functions·is·of·course·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="0469734003-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0469734003-2">(</span><span·class="p"·data-group-id="0469734003-3">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·674,·SHA:·c1ef081bea27607687703878ad4da9b9c544a85ad1476cd648a732d0c850d7f2·...·]-1">)</span><span·class="p">.</span><span·class="w">1900 built-in·match·specification·functions·is·of·course·allowed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="8920267441-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="8920267441-2">(</span><span·class="p"·data-group-id="8920267441-3">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·674,·SHA:·713f27f1e25623bd8bae184b29bf75c0c5caf0dda5146c032d2b759bdced5be3·...·]-1">)</span><span·class="p">.</span><span·class="w">
1901 </span><span·class="n">Error</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">containing</span><span·class="w">·</span><span·class="ss">local</span><span·class="w">·</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="nf">calls</span><span·class="w">1901 </span><span·class="n">Error</span><span·class="p">:</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">containing</span><span·class="w">·</span><span·class="ss">local</span><span·class="w">·</span><span·class="n">Erlang</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="nf">calls</span><span·class="w">
1902 </span><span·class="p"·data-group-id="0469734003-5">(</span><span·class="ss">&#39;my_fun&#39;</span><span·class="w">·</span><span·class="ss">called</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">guard</span><span·class="p"·data-group-id="046973[·...·truncated·by·diffoscope;·len:·4,·SHA:·43871a4ea259ce408e919860279fa4f7af23f0000303064f8e692fb6317ca397·...·]-5">)</span><span·class="w">·</span><span·class="ss">cannot</span><span·class="w">·</span><span·class="ss">be</span><span·class="w">·</span><span·class="ss">translated</span><span·class="w">·</span><span·class="ss">into</span><span·class="w">·</span><span·class="ss">match_spec</span><span·class="w">1902 </span><span·class="p"·data-group-id="8920267441-5">(</span><span·class="ss">&#39;my_fun&#39;</span><span·class="w">·</span><span·class="ss">called</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">guard</span><span·class="p"·data-group-id="892026[·...·truncated·by·diffoscope;·len:·4,·SHA:·bbd307789c2f6185cf06b5580eda54cd81410e12cf2836180c275532fbad700b·...·]-5">)</span><span·class="w">·</span><span·class="ss">cannot</span><span·class="w">·</span><span·class="ss">be</span><span·class="w">·</span><span·class="ss">translated</span><span·class="w">·</span><span·class="ss">into</span><span·class="w">·</span><span·class="ss">match_spec</span><span·class="w">
1903 </span><span·class="p"·data-group-id="0469734003-6">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">transform_error</span><span·class="p"·data-group-id="0469734003-6">}</span><span·class="gp·unselectable">1903 </span><span·class="p"·data-group-id="8920267441-6">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">transform_error</span><span·class="p"·data-group-id="8920267441-6">}</span><span·class="gp·unselectable">
1904 5&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="0469734003-7">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0469734003-8">(</span><span·class="p"·data-group-id="0469734003-9">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·677,·SHA:·b713195dcbf8e7fb0c900a19b568f938429756318f03e179e7a7deeb9e0ca914·...·]-7">)</span><span·class="p">.</span><span·class="w">1904 5&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="8920267441-7">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="8920267441-8">(</span><span·class="p"·data-group-id="8920267441-9">{</span><span·class="n">M</span><span·class="p">,</span><span·class="n">N</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·677,·SHA:·4fa51d5dedec0ed9369629a351e2cf39827e2f6b344d12ccc413551f13ee4c12·...·]-7">)</span><span·class="p">.</span><span·class="w">
1905 </span><span·class="p"·data-group-id="0469734003-11">[</span><span·class="p"·data-group-id="0469734003-12">{</span><span·class="p"·data-group-id="0469734003-13">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1059,·SHA:·60192953e5c0223623a56441c2e9349471ca3f63d48af03fe33035817ea4212b·...·]-11">]</span></code></pre><p>As·shown·by·the·example,·the·function·can·be·called·from·the·shell·also.·The·fun1905 </span><span·class="p"·data-group-id="8920267441-11">[</span><span·class="p"·data-group-id="8920267441-12">{</span><span·class="p"·data-group-id="8920267441-13">{</span><span·class="ss">&#39;$1&#39;</span><span·class="p">,</span><span·class="ss">&#39;$2&#39;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·1059,·SHA:·e4bdaae6c46db7cf062a6f83ea3d513941dfeec1d97296aed7dfcf1eb38a286f·...·]-11">]</span></code></pre><p>As·shown·by·the·example,·the·function·can·be·called·from·the·shell·also.·The·fun
1906 must·be·literally·in·the·call·when·used·from·the·shell·as·well.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>If·the·<code·class="inline">parse_transform</code>·is·not·applied·to·a·module·that·calls·this·pseudo1906 must·be·literally·in·the·call·when·used·from·the·shell·as·well.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>If·the·<code·class="inline">parse_transform</code>·is·not·applied·to·a·module·that·calls·this·pseudo
1907 function,·the·call·fails·in·runtime·(with·a·<code·class="inline">badarg</code>).·The·<code·class="inline">ets</code>·module1907 function,·the·call·fails·in·runtime·(with·a·<code·class="inline">badarg</code>).·The·<code·class="inline">ets</code>·module
1908 exports·a·function·with·this·name,·but·it·is·never·to·be·called·except·when1908 exports·a·function·with·this·name,·but·it·is·never·to·be·called·except·when
1909 using·the·function·in·the·shell.·If·the·<code·class="inline">parse_transform</code>·is·properly·applied1909 using·the·function·in·the·shell.·If·the·<code·class="inline">parse_transform</code>·is·properly·applied
1910 by·including·header·file·<code·class="inline">ms_transform.hrl</code>,·compiled·code·never·calls·the1910 by·including·header·file·<code·class="inline">ms_transform.hrl</code>,·compiled·code·never·calls·the
1911 function,·but·the·function·call·is·replaced·by·a·literal·match·specification.</p></section><p>For·more·information,·see·<a·href="ms_transform.html"><code·class="inline">ms_transform</code></a>.</p>1911 function,·but·the·function·call·is·replaced·by·a·literal·match·specification.</p></section><p>For·more·information,·see·<a·href="ms_transform.html"><code·class="inline">ms_transform</code></a>.</p>
1912 ··</section>1912 ··</section>
Offset 2491, 20 lines modifiedOffset 2491, 20 lines modified
  
2491 ··········<pre·translate="no"><span·class="attribute">-spec</span>·match(Table,·Pattern)·->·[Match]2491 ··········<pre·translate="no"><span·class="attribute">-spec</span>·match(Table,·Pattern)·->·[Match]
2492 ···············when·Table·::·<a·href="#t:table/0">table</a>(),·Pattern·::·<a·href="#t:match_pattern/0">match_pattern</a>(),·Match·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>2492 ···············when·Table·::·<a·href="#t:table/0">table</a>(),·Pattern·::·<a·href="#t:match_pattern/0">match_pattern</a>(),·Match·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>
  
2493 ······</div>2493 ······</div>
  
2494 <p>Matches·the·objects·in·table·<code·class="inline">Table</code>·against·pattern·<code·class="inline">Pattern</code>.</p><p>A·pattern·is·a·term·that·can·contain:</p><ul><li>Bound·parts·(Erlang·terms)</li><li><code·class="inline">'_'</code>·that·matches·any·Erlang·term</li><li>Pattern·variables·<code·class="inline">'$N'</code>,·where·<code·class="inline">N</code>=0,1,...</li></ul><p>The·function·returns·a·list·with·one·element·for·each·matching·object,·where2494 <p>Matches·the·objects·in·table·<code·class="inline">Table</code>·against·pattern·<code·class="inline">Pattern</code>.</p><p>A·pattern·is·a·term·that·can·contain:</p><ul><li>Bound·parts·(Erlang·terms)</li><li><code·class="inline">'_'</code>·that·matches·any·Erlang·term</li><li>Pattern·variables·<code·class="inline">'$N'</code>,·where·<code·class="inline">N</code>=0,1,...</li></ul><p>The·function·returns·a·list·with·one·element·for·each·matching·object,·where
2495 each·element·is·an·ordered·list·of·pattern·variable·bindings,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="6929971170-1">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="6929971170-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Matches·every·object·in·table</span><span·class="w">2495 each·element·is·an·ordered·list·of·pattern·variable·bindings,·for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="9940360976-1">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="9940360976-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Matches·every·object·in·table</span><span·class="w">
2496 </span><span·class="p"·data-group-id="6929971170-2">[</span><span·class="p"·data-group-id="6929971170-3">[</span><span·class="p"·data-group-id="6929971170-4">{</span><span·class="ss">rufsen</span><span·class="p">,</span><span·class="ss">dog</span><span·class="p">,</span><span·class="mi">7</spa[·...·truncated·by·diffoscope;·len:·882,·SHA:·2f73704bda790ba023e0defb46ed093b0ce28b4344d7e8780358b123232c6994·...·]-2">]</span><span·class="gp·unselectable">2496 </span><span·class="p"·data-group-id="9940360976-2">[</span><span·class="p"·data-group-id="9940360976-3">[</span><span·class="p"·data-group-id="9940360976-4">{</span><span·class="ss">rufsen</span><span·class="p">,</span><span·class="ss">dog</span><span·class="p">,</span><span·class="mi">7</spa[·...·truncated·by·diffoscope;·len:·882,·SHA:·94ec84cac2de0bfd225f8ac594c553a08340d9151f0c6df7b58d647d9856f746·...·]-2">]</span><span·class="gp·unselectable">
2497 7&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="6929971170-9">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6929971170-10">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">dog</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·133,·SHA:·8f999b32a5a05ed6d40d40a40a9fba0d97a4f1358eb879cdbd3471ca1a073860·...·]-9">)</span><span·class="p">.</span><span·class="w">2497 7&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="9940360976-9">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9940360976-10">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">dog</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·133,·SHA:·9d20ce1a9664ae7286b1a35a022ea19f4220bd0cd094232f6c6399149844cb29·...·]-9">)</span><span·class="p">.</span><span·class="w">
2498 </span><span·class="p"·data-group-id="6929971170-11">[</span><span·class="p"·data-group-id="6929971170-12">[</span><span·class="mi">7</span><span·class="p"·data-group-id="6929971170-12">]</span><span·class="p">,</span><span·class="p"·data-group-id="6929971170-13">[</span><span·class="mi">5</sp[·...·truncated·by·diffoscope;·len:·98,·SHA:·1994a2ae171c49927fa5c4e94bde7efed57ca7789af49b0d6a53b676f81141db·...·]-11">]</span><span·class="gp·unselectable">2498 </span><span·class="p"·data-group-id="9940360976-11">[</span><span·class="p"·data-group-id="9940360976-12">[</span><span·class="mi">7</span><span·class="p"·data-group-id="9940360976-12">]</span><span·class="p">,</span><span·class="p"·data-group-id="9940360976-13">[</span><span·class="mi">5</sp[·...·truncated·by·diffoscope;·len:·98,·SHA:·2d354e615812dff2d7ed07fa8b4f07d30b6d6c1a6f8cc250388909f3b3ca2ff0·...·]-11">]</span><span·class="gp·unselectable">
2499 8&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="6929971170-14">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6929971170-15">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">cow</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·134,·SHA:·ecbe011c49402d56d997eb699093ab7e7257336dee7323536a32999c2eb668c3·...·]-14">)</span><span·class="p">.</span><span·class="w">2499 8&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="9940360976-14">(</span><span·class="n">T</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9940360976-15">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="ss">cow</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·134,·SHA:·3babe0fe5fc5c04c9f111db63ca16870670727bc1643860060079f2e1fa8183c·...·]-14">)</span><span·class="p">.</span><span·class="w">
2500 </span><span·class="p"·data-group-id="6929971170-16">[</span><span·class="p"·data-group-id="6929971170-16">]</span></code></pre><p>If·the·key·is·specified·in·the·pattern,·the·match·is·very·efficient.·If·the·key2500 </span><span·class="p"·data-group-id="9940360976-16">[</span><span·class="p"·data-group-id="9940360976-16">]</span></code></pre><p>If·the·key·is·specified·in·the·pattern,·the·match·is·very·efficient.·If·the·key
2501 is·not·specified,·that·is,·if·it·is·a·variable·or·an·underscore,·the·entire2501 is·not·specified,·that·is,·if·it·is·a·variable·or·an·underscore,·the·entire
2502 table·must·be·searched.·The·search·time·can·be·substantial·if·the·table·is·very2502 table·must·be·searched.·The·search·time·can·be·substantial·if·the·table·is·very
2503 large.</p><p>For·tables·of·type·<code·class="inline">ordered_set</code>,·the·result·is·in·the·same·order·as·in·a2503 large.</p><p>For·tables·of·type·<code·class="inline">ordered_set</code>,·the·result·is·in·the·same·order·as·in·a
2504 <code·class="inline">first</code>/<code·class="inline">next</code>·traversal.</p>2504 <code·class="inline">first</code>/<code·class="inline">next</code>·traversal.</p>
2505 ··</section>2505 ··</section>
2506 </section>2506 </section>
2507 <section·class="detail"·id="match/3">2507 <section·class="detail"·id="match/3">
Offset 2734, 18 lines modifiedOffset 2734, 18 lines modified
2734 use.</p><p>The·matching·is·executed·on·each·element·in·<code·class="inline">List</code>·and·the·function·returns·a2734 use.</p><p>The·matching·is·executed·on·each·element·in·<code·class="inline">List</code>·and·the·function·returns·a
2735 list·containing·all·results.·If·an·element·in·<code·class="inline">List</code>·does·not·match,·nothing·is2735 list·containing·all·results.·If·an·element·in·<code·class="inline">List</code>·does·not·match,·nothing·is
2736 returned·for·that·element.·The·length·of·the·result·list·is·therefore·equal·or2736 returned·for·that·element.·The·length·of·the·result·list·is·therefore·equal·or
2737 less·than·the·length·of·parameter·<code·class="inline">List</code>.</p><p><em>Example:</em></p><p>The·following·two·calls·give·the·same·result·(but·certainly·not·the·same2737 less·than·the·length·of·parameter·<code·class="inline">List</code>.</p><p><em>Example:</em></p><p>The·following·two·calls·give·the·same·result·(but·certainly·not·the·same
2738 execution·time):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Table</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="ss">new</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">2738 execution·time):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Table</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="ss">new</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
2739 </span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">2739 </span><span·class="n">MatchSpec</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
2740 </span><span·class="c1">%·The·following·call...</span><span·class="w">2740 </span><span·class="c1">%·The·following·call...</span><span·class="w">
2741 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_spec_run</span><span·class="p"·data-group-id="4563446115-1">(</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">tab2list</span><span·class="p"·data-group-id="4563446115-2">(</span><span·class="n">Table</span><span·class="p"·data-group-id="4563446115-2">)</span><span·class="p">,</span><span·class="w">2741 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_spec_run</span><span·class="p"·data-group-id="7167616462-1">(</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">tab2list</span><span·class="p"·data-group-id="7167616462-2">(</span><span·class="n">Table</span><span·class="p"·data-group-id="7167616462-2">)</span><span·class="p">,</span><span·class="w">
2742 ···················</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_spec_compile</span><span·class="p"·data-group-id="4563446115-3">(</span><span·class="n">MatchSpec</span><span·class="p"·data-group-id="4563446115-3">)</span><span·class="p"·data-group-id="4563446115-1">)</span><span·class="p">,</span><span·class="w">2742 ···················</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match_spec_compile</span><span·class="p"·data-group-id="7167616462-3">(</span><span·class="n">MatchSpec</span><span·class="p"·data-group-id="7167616462-3">)</span><span·class="p"·data-group-id="7167616462-1">)</span><span·class="p">,</span><span·class="w">
2743 </span><span·class="c1">%·...gives·the·same·result·as·the·more·common·(and·more·efficient)</span><span·class="w">2743 </span><span·class="c1">%·...gives·the·same·result·as·the·more·common·(and·more·efficient)</span><span·class="w">
2744 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="4563446115-4">(</span><span·class="n">Table</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MatchSpec</span><span·class="p"·data-group-id="4563446115-4">)</span><span·class="p">,</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·function·has·limited·use·in·normal·code.·It·is·used·by·the·<a·href="dets.html"><code·class="inline">dets</code></a>2744 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="7167616462-4">(</span><span·class="n">Table</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MatchSpec</span><span·class="p"·data-group-id="7167616462-4">)</span><span·class="p">,</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·function·has·limited·use·in·normal·code.·It·is·used·by·the·<a·href="dets.html"><code·class="inline">dets</code></a>
2745 module·to·perform·the·<a·href="dets.html#select/1"><code·class="inline">dets:select/1</code></a>·operations·and·by·Mnesia·during2745 module·to·perform·the·<a·href="dets.html#select/1"><code·class="inline">dets:select/1</code></a>·operations·and·by·Mnesia·during
2746 transactions.</p></section>2746 transactions.</p></section>
2747 ··</section>2747 ··</section>
2748 </section>2748 </section>
2749 <section·class="detail"·id="member/2">2749 <section·class="detail"·id="member/2">
  
2750 ··<div·class="detail-header">2750 ··<div·class="detail-header">
Offset 3084, 27 lines modifiedOffset 3084, 27 lines modified
3084 <p>Restores·an·opaque·continuation·returned·by·<a·href="#select/3"><code·class="inline">select/3</code></a>·or·<a·href="#select/1"><code·class="inline">select/1</code></a>·if·the3084 <p>Restores·an·opaque·continuation·returned·by·<a·href="#select/3"><code·class="inline">select/3</code></a>·or·<a·href="#select/1"><code·class="inline">select/1</code></a>·if·the
3085 continuation·has·passed·through·external·term·format·(been·sent·between·nodes·or3085 continuation·has·passed·through·external·term·format·(been·sent·between·nodes·or
3086 stored·on·disk).</p><p>The·reason·for·this·function·is·that·continuation·terms·contain·compiled·match3086 stored·on·disk).</p><p>The·reason·for·this·function·is·that·continuation·terms·contain·compiled·match
3087 specifications·and·may·therefore·be·invalidated·if·converted·to·external·term3087 specifications·and·may·therefore·be·invalidated·if·converted·to·external·term
3088 format.·Given·that·the·original·match·specification·is·kept·intact,·the3088 format.·Given·that·the·original·match·specification·is·kept·intact,·the
3089 continuation·can·be·restored,·meaning·it·can·once·again·be·used·in·subsequent3089 continuation·can·be·restored,·meaning·it·can·once·again·be·used·in·subsequent
3090 <a·href="#select/1"><code·class="inline">select/1</code></a>·calls·even·though·it·has·been·stored·on·disk·or·on3090 <a·href="#select/1"><code·class="inline">select/1</code></a>·calls·even·though·it·has·been·stored·on·disk·or·on
3091 another·node.</p><p><em>Examples:</em></p><p>The·following·sequence·of·calls·may·fail:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T</span><span·class="o">=</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="0404231764-1">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="0404231764-2">[</span><span·class="p"·data-group-id="0404231764-2">]</span><span·class="p"·data-group-id="0404231764-1">)</span><span·class="p">,</span><span·class="w">3091 another·node.</p><p><em>Examples:</em></p><p>The·following·sequence·of·calls·may·fail:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T</span><span·class="o">=</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="7983811590-1">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="7983811590-2">[</span><span·class="p"·data-group-id="7983811590-2">]</span><span·class="p"·data-group-id="7983811590-1">)</span><span·class="p">,</span><span·class="w">
3092 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">3092 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
3093 </span><span·class="n">MS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="0404231764-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0404231764-4">(</span><span·class="p"·data-group-id="0404231764-5">{</span><span·class="n">N</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·722,·SHA:·41b82e09dfc1d722fd159e34927b9822cbdd45a54a7e944fc98454bed7011df3·...·]-3">)</span><span·class="p">,</span><span·class="w">3093 </span><span·class="n">MS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="7983811590-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7983811590-4">(</span><span·class="p"·data-group-id="7983811590-5">{</span><span·class="n">N</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·722,·SHA:·4eb8b8a9224e3a021e76c7c641fdf0bf53e674189ad780965b755774db9dc887·...·]-3">)</span><span·class="p">,</span><span·class="w">
3094 </span><span·class="p"·data-group-id="0404231764-7">{</span><span·class="p">_</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="0404231764-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·clas[·...·truncated·by·diffoscope;·len:·309,·SHA:·786e30b326e1f87bea18936a304ced43d1d88f5c15d09578170430e334f9204e·...·]-8">)</span><span·class="p">,</span><span·class="w">3094 </span><span·class="p"·data-group-id="7983811590-7">{</span><span·class="p">_</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="7983811590-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·clas[·...·truncated·by·diffoscope;·len:·309,·SHA:·010f95a99d5585e5cff14b882f5f9dd70499b3e660a349fa905e1d6de9d22fd9·...·]-8">)</span><span·class="p">,</span><span·class="w">
3095 </span><span·class="n">MaybeBroken</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="0404231764-9">(</span><span·class="nf">term_to_binary</span><span·class="p"·data-group-id="0404231764-10">(</span><span·class="n">C</span><span·class="p"·data-group-id="0404231764-10">)</span><span·class="p"·data-group-id="0404231764-9">)</span><span·class="p">,</span><span·class="w">3095 </span><span·class="n">MaybeBroken</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="7983811590-9">(</span><span·class="nf">term_to_binary</span><span·class="p"·data-group-id="7983811590-10">(</span><span·class="n">C</span><span·class="p"·data-group-id="7983811590-10">)</span><span·class="p"·data-group-id="7983811590-9">)</span><span·class="p">,</span><span·class="w">
3096 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="0404231764-11">(</span><span·class="n">MaybeBroken</span><span·class="p"·data-group-id="0404231764-11">)</span><span·class="p">.</span></code></pre><p>The·following·sequence·works,·as·the·call·to3096 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="7983811590-11">(</span><span·class="n">MaybeBroken</span><span·class="p"·data-group-id="7983811590-11">)</span><span·class="p">.</span></code></pre><p>The·following·sequence·works,·as·the·call·to
3097 <a·href="#repair_continuation/2"><code·class="inline">repair_continuation/2</code></a>·reestablishes·the3097 <a·href="#repair_continuation/2"><code·class="inline">repair_continuation/2</code></a>·reestablishes·the
3098 <code·class="inline">MaybeBroken</code>·continuation.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T</span><span·class="o">=</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="1469103006-1">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="1469103006-2">[</span><span·class="p"·data-group-id="1469103006-2">]</span><span·class="p"·data-group-id="1469103006-1">)</span><span·class="p">,</span><span·class="w">3098 <code·class="inline">MaybeBroken</code>·continuation.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">T</span><span·class="o">=</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="4228054044-1">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="4228054044-2">[</span><span·class="p"·data-group-id="4228054044-2">]</span><span·class="p"·data-group-id="4228054044-1">)</span><span·class="p">,</span><span·class="w">
3099 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">3099 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
3100 </span><span·class="n">MS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="1469103006-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="1469103006-4">(</span><span·class="p"·data-group-id="1469103006-5">{</span><span·class="n">N</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·722,·SHA:·44aa0f9187e7a7543edbb4dbfc20e53e767c519b10e20948137ca5f6a6f78b82·...·]-3">)</span><span·class="p">,</span><span·class="w">3100 </span><span·class="n">MS</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="4228054044-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4228054044-4">(</span><span·class="p"·data-group-id="4228054044-5">{</span><span·class="n">N</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·722,·SHA:·165c0c3ffbbf402e3f914f230004457b6af5fb51f1e0dd898c5e9bccf54f25fd·...·]-3">)</span><span·class="p">,</span><span·class="w">
3101 </span><span·class="p"·data-group-id="1469103006-7">{</span><span·class="p">_</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="1469103006-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·clas[·...·truncated·by·diffoscope;·len:·261,·SHA:·a8c6cc401ebcb09e980eff959da2e56e54dcb9610bdb8a9494f121b6658f24fd·...·]-8">)</span><span·class="p">,</span><span·class="w">3101 </span><span·class="p"·data-group-id="4228054044-7">{</span><span·class="p">_</span><span·class="p">,</span><span·class="n">C</span><span·class="p"·data-group-id="4228054044-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">ets</span><span·clas[·...·truncated·by·diffoscope;·len:·261,·SHA:·f6ca339e8762cd6a3b6a497aec7a7a872f254ae4f6934436819789ed74f1ccf7·...·]-8">)</span><span·class="p">,</span><span·class="w">
3102 </span><span·class="n">MaybeBroken</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="1469103006-9">(</span><span·class="nf">term_to_binary</span><span·class="p"·data-group-id="1469103006-10">(</span><span·class="n">C</span><span·class="p"·data-group-id="1469103006-10">)</span><span·class="p"·data-group-id="1469103006-9">)</span><span·class="p">,</span><span·class="w">3102 </span><span·class="n">MaybeBroken</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary_to_term</span><span·class="p"·data-group-id="4228054044-9">(</span><span·class="nf">term_to_binary</span><span·class="p"·data-group-id="4228054044-10">(</span><span·class="n">C</span><span·class="p"·data-group-id="4228054044-10">)</span><span·class="p"·data-group-id="4228054044-9">)</span><span·class="p">,</span><span·class="w">
3103 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="1469103006-11">(</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">repair_continuation</span><span·class="p"·data-group-id="1469103006-12">(</span><span·class="n">MaybeBroken</span><span·class="p">,</span><span·class="n">MS</span><s[·...·truncated·by·diffoscope;·len:·93,·SHA:·4e0c9600ca84bef539badf6b6cf72a6f61472a0a395d30291f3e75938c88bc91·...·]-11">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·function·is·rarely·needed·in·application·code.·It·is·used·by·Mnesia·to3103 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="4228054044-11">(</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">repair_continuation</span><span·class="p"·data-group-id="4228054044-12">(</span><span·class="n">MaybeBroken</span><span·class="p">,</span><span·class="n">MS</span><s[·...·truncated·by·diffoscope;·len:·93,·SHA:·12fc686cad85645d3b6c7aa0e1af99351c839506b09585e40a364dea1fd1d712·...·]-11">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·function·is·rarely·needed·in·application·code.·It·is·used·by·Mnesia·to
3104 provide·distributed·<a·href="#select/3"><code·class="inline">select/3</code></a>·and·<a·href="#select/1"><code·class="inline">select/1</code></a>3104 provide·distributed·<a·href="#select/3"><code·class="inline">select/3</code></a>·and·<a·href="#select/1"><code·class="inline">select/1</code></a>
3105 sequences.·A·normal·application·would·either·use·Mnesia·or·keep·the3105 sequences.·A·normal·application·would·either·use·Mnesia·or·keep·the
3106 continuation·from·being·converted·to·external·format.</p><p>The·actual·behavior·of·compiled·match·specifications·when·recreated·from3106 continuation·from·being·converted·to·external·format.</p><p>The·actual·behavior·of·compiled·match·specifications·when·recreated·from
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Offset 191, 43 lines modifiedOffset 191, 43 lines modified
191 function·has·been·applied·to·all·of·the·results·or·an·error·occurs,·the·last191 function·has·been·applied·to·all·of·the·results·or·an·error·occurs,·the·last
192 function·is·called·with·argument·<code·class="inline">close</code>,·and·the·reply·is·returned·as·value·of192 function·is·called·with·argument·<code·class="inline">close</code>,·and·the·reply·is·returned·as·value·of
193 the·current·call·to·the·sort·or·merge·function.</p><p>If·a·function·is·specified·as·input·and·the·last·input·function·returns193 the·current·call·to·the·sort·or·merge·function.</p><p>If·a·function·is·specified·as·input·and·the·last·input·function·returns
194 <code·class="inline">{end_of_input,·Value}</code>,·the·function·specified·as·output·is·called·with194 <code·class="inline">{end_of_input,·Value}</code>,·the·function·specified·as·output·is·called·with
195 argument·<code·class="inline">{value,·Value}</code>.·This·makes·it·easy·to·initiate·the·sequence·of·output195 argument·<code·class="inline">{value,·Value}</code>.·This·makes·it·easy·to·initiate·the·sequence·of·output
196 functions·with·a·value·calculated·by·the·input·functions.</p><p>As·an·example,·consider·sorting·the·terms·on·a·disk·log·file.·A·function·that196 functions·with·a·value·calculated·by·the·input·functions.</p><p>As·an·example,·consider·sorting·the·terms·on·a·disk·log·file.·A·function·that
197 reads·chunks·from·the·disk·log·and·returns·a·list·of·binaries·is·used·as·input.197 reads·chunks·from·the·disk·log·and·returns·a·list·of·binaries·is·used·as·input.
198 The·results·are·collected·in·a·list·of·terms.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sort</span><span·class="p"·data-group-id="5041859493-1">(</span><span·class="n">Log</span><span·class="p"·data-group-id="5041859493-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
199 ····</span><span·class="p"·data-group-id="5041859493-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="5041859493-2">}</span><span·class="w">·</span><span·class="o">=[·...·truncated·by·diffoscope;·len:·767,·SHA:·dd3dce24f733c81789e0b82fc48e44e26f0ed49ca45ac63d30e5ab999ff9dbf0·...·]</span><span·class="w">198 The·results·are·collected·in·a·list·of·terms.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sort</span><span·class="p"·data-group-id="9397090175-1">(</span><span·class="n">Log</span><span·class="p"·data-group-id="9397090175-1">)</span[·...·truncated·by·diffoscope;·len:·46,·SHA:·1097a0bea68d65a431edcb4038943364caa12d307d0cd39d47cedc89a660f4e0·...·]</span><span·class="w">
 199 ····</span><span·class="p"·data-group-id="9397090175-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="9397090175-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="9397090175-3">(</span><span·class="p"·data-group-id="9397090175-4">[</span><span·class="p"·data-group-id="9397090175-5">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="n">Log</span><span·class="p"·data-group-id="9397090175-5">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9397090175-6">{</span><span·class="ss">mode</span><span·class="p">,</span><span·class="ss">read_only</span><span·class="p"·data-group-id="9397090175-6">}</span><span·class="p"·data-group-id="9397090175-4">]</span><span·class="p"·data-group-id="9397090175-3">)</span><span·class="p">,</span><span·class="w">
200 ····</span><span·class="n">Input</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">input</span><span·class="p"·data-group-id="5041859493-7">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start</span><span·class="p"·data-group-id="5041859493-7">)</span><span·class="p">,</span><span·class="w">200 ····</span><span·class="n">Input</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">input</span><span·class="p"·data-group-id="9397090175-7">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">start</span><span·class="p"·data-group-id="9397090175-7">)</span><span·class="p">,</span><span·class="w">
201 ····</span><span·class="n">Output</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">output</span><span·class="p"·data-group-id="5041859493-8">(</span><span·class="p"·data-group-id="5041859493-9">[</span><span·class="p"·data-group-id="5041859493-9">]</span><span·class="p"·data-group-id="5041859493-8">)</span><span·class="p">,</span><span·class="w">201 ····</span><span·class="n">Output</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">output</span><span·class="p"·data-group-id="9397090175-8">(</span><span·class="p"·data-group-id="9397090175-9">[</span><span·class="p"·data-group-id="9397090175-9">]</span><span·class="p"·data-group-id="9397090175-8">)</span><span·class="p">,</span><span·class="w">
202 ····</span><span·class="n">Reply</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file_sorter</span><span·class="p">:</span><span·class="nf">sort</span><span·class="p"·data-group-id="5041859493-10">(</span><span·class="n">Input</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Output</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5041859493-11">{</span><span·class="ss">format</s[·...·truncated·by·diffoscope;·len:·151,·SHA:·d8ce7a54b8dc829fc3eb4d24451233cee1ed283aeb158c9636e43b21f5267a09·...·]-10">)</span><span·class="p">,</span><span·class="w">202 ····</span><span·class="n">Reply</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file_sorter</span><span·class="p">:</span><span·class="nf">sort</span><span·class="p"·data-group-id="9397090175-10">(</span><span·class="n">Input</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Output</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9397090175-11">{</span><span·class="ss">format</s[·...·truncated·by·diffoscope;·len:·151,·SHA:·dc9ba5930c85c33129325a74bd5768b049928b232e896a533af50bb330089067·...·]-10">)</span><span·class="p">,</span><span·class="w">
203 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5041859493-12">(</span><span·class="n">Log</span><span·class="p"·data-group-id="5041859493-12">)</span><span·class="p">,</span><span·class="w">203 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="9397090175-12">(</span><span·class="n">Log</span><span·class="p"·data-group-id="9397090175-12">)</span><span·class="p">,</span><span·class="w">
204 ····</span><span·class="n">Reply</span><span·class="p">.</span><span·class="w">204 ····</span><span·class="n">Reply</span><span·class="p">.</span><span·class="w">
  
205 </span><span·class="nf">input</span><span·class="p"·data-group-id="5041859493-13">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cont</span><span·class="p"·data-group-id="5041859493-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 </span><span·class="nf">input</span><span·class="p"·data-group-id="9397090175-13">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cont</span><span·class="p"·data-group-id="9397090175-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="5041859493-14">(</span><span·class="ss">close</span><span·class="p"·data-group-id="5041859493-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="9397090175-14">(</span><span·class="ss">close</span><span·class="p"·data-group-id="9397090175-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ············</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">207 ············</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
208 ·······</span><span·class="p"·data-group-id="5041859493-15">(</span><span·class="ss">read</span><span·class="p"·data-group-id="5041859493-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 ·······</span><span·class="p"·data-group-id="9397090175-15">(</span><span·class="ss">read</span><span·class="p"·data-group-id="9397090175-15">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">chunk</span><span·class="p"·data-group-id="5041859493-16">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cont</span><span·class="p"·data-group-id="5041859493-16">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">209 ············</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">disk_log</span><span·class="p">:</span><span·class="nf">chunk</span><span·class="p"·data-group-id="9397090175-16">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cont</span><span·class="p"·data-group-id="9397090175-16">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
210 ················</span><span·class="p"·data-group-id="5041859493-17">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5041859493-17">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 ················</span><span·class="p"·data-group-id="9397090175-17">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="9397090175-17">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ····················</span><span·class="p"·data-group-id="5041859493-18">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="5041859493-18">}</span><span·class="p">;</span><span·class="w">211 ····················</span><span·class="p"·data-group-id="9397090175-18">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="9397090175-18">}</span><span·class="p">;</span><span·class="w">
212 ················</span><span·class="p"·data-group-id="5041859493-19">{</span><span·class="n">Cont2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Terms</span><span·class="p"·data-group-id="5041859493-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">212 ················</span><span·class="p"·data-group-id="9397090175-19">{</span><span·class="n">Cont2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Terms</span><span·class="p"·data-group-id="9397090175-19">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
213 ····················</span><span·class="p"·data-group-id="5041859493-20">{</span><span·class="n">Terms</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">input</span><span·class="p"·data-group-id="5041859493-21">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·123,·SHA:·febb42901800b97a7fcab7275a46af76b61c15d38e9c42cba4f6750104f7e5b7·...·]-20">}</span><span·class="p">;</span><span·class="w">213 ····················</span><span·class="p"·data-group-id="9397090175-20">{</span><span·class="n">Terms</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">input</span><span·class="p"·data-group-id="9397090175-21">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·123,·SHA:·5dbff58da80e404ec2fe8d67d9da73001216ae5c0608cb436e2a781dacb6ec8b·...·]-20">}</span><span·class="p">;</span><span·class="w">
214 ················</span><span·class="p"·data-group-id="5041859493-22">{</span><span·class="n">Cont2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Terms</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Badbytes</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·d26bd2388140fe31b51e4287da8adaa2188c529f269e01ca3da801b04205842e·...·]-22">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 ················</span><span·class="p"·data-group-id="9397090175-22">{</span><span·class="n">Cont2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Terms</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Badbytes</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·261be37237730b37fcc0f09e0567d16cc26e8573c4e42d1aa0aada1658ed09d3·...·]-22">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ····················</span><span·class="p"·data-group-id="5041859493-23">{</span><span·class="n">Terms</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">input</span><span·class="p"·data-group-id="5041859493-24">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·123,·SHA:·07bcd7f85c8dd3aca03bfac1cd5b2a625c4cd03e6d2fe6604b5d587a50c6c98c·...·]-23">}</span><span·class="p">;</span><span·class="w">215 ····················</span><span·class="p"·data-group-id="9397090175-23">{</span><span·class="n">Terms</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">input</span><span·class="p"·data-group-id="9397090175-24">(</span><span·class="n">Log</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·123,·SHA:·12e9c8e98767576d0c5cfdb2c1f83ea4d12a53188cd87b298bea68d9f1d07ad5·...·]-23">}</span><span·class="p">;</span><span·class="w">
216 ················</span><span·class="ss">eof</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">216 ················</span><span·class="ss">eof</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
217 ····················</span><span·class="ss">end_of_input</span><span·class="w">217 ····················</span><span·class="ss">end_of_input</span><span·class="w">
218 ············</span><span·class="k">end</span><span·class="w">218 ············</span><span·class="k">end</span><span·class="w">
219 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">219 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
220 </span><span·class="nf">output</span><span·class="p"·data-group-id="5041859493-25">(</span><span·class="n">L</span><span·class="p"·data-group-id="5041859493-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">220 </span><span·class="nf">output</span><span·class="p"·data-group-id="9397090175-25">(</span><span·class="n">L</span><span·class="p"·data-group-id="9397090175-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
221 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="5041859493-26">(</span><span·class="ss">close</span><span·class="p"·data-group-id="5041859493-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">221 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="9397090175-26">(</span><span·class="ss">close</span><span·class="p"·data-group-id="9397090175-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
222 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5041859493-27">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="5041859493-28">(</span><span·class="n">L</span><span·class="p"·data-group-id="5041859493-28">)</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·6a6ea8b01d50b48683b6effe9be795517efc58ad06edd86dff079176974025d0·...·]-27">)</span><span·class="p">;</span><span·class="w">222 ············</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="9397090175-27">(</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="9397090175-28">(</span><span·class="n">L</span><span·class="p"·data-group-id="9397090175-28">)</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·2d6692f2bcbeebbb8af7c705d2fbb982a284dd9d2badaaa348c8b53762d6ea29·...·]-27">)</span><span·class="p">;</span><span·class="w">
223 ·······</span><span·class="p"·data-group-id="5041859493-29">(</span><span·class="n">Terms</span><span·class="p"·data-group-id="5041859493-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">223 ·······</span><span·class="p"·data-group-id="9397090175-29">(</span><span·class="n">Terms</span><span·class="p"·data-group-id="9397090175-29">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
224 ············</span><span·class="nf">output</span><span·class="p"·data-group-id="5041859493-30">(</span><span·class="p"·data-group-id="5041859493-31">[</span><span·class="n">Terms</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="5041859493-31">]</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·d516670bd86f943d5c71fa29753fd5ca3dae5cddfa83fb2169dcc759cd4c9e32·...·]-30">)</span><span·class="w">224 ············</span><span·class="nf">output</span><span·class="p"·data-group-id="9397090175-30">(</span><span·class="p"·data-group-id="9397090175-31">[</span><span·class="n">Terms</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="9397090175-31">]</span><[·...·truncated·by·diffoscope;·len:·40,·SHA:·afe52b529f6bc5c83f110c520366aba6d8d108a524dc63ebe9348c90bdbe94cd·...·]-30">)</span><span·class="w">
225 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>For·more·examples·of·functions·as·input·and·output,·see·the·end·of·the225 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>For·more·examples·of·functions·as·input·and·output,·see·the·end·of·the
226 <code·class="inline">file_sorter</code>·module;·the·<code·class="inline">term</code>·format·is·implemented·with·functions.</p><p>The·possible·values·of·<code·class="inline">Reason</code>·returned·when·an·error·occurs·are:</p><ul><li><code·class="inline">bad_object</code>,·<code·class="inline">{bad_object,·FileName}</code>·-·Applying·the·format·function·failed226 <code·class="inline">file_sorter</code>·module;·the·<code·class="inline">term</code>·format·is·implemented·with·functions.</p><p>The·possible·values·of·<code·class="inline">Reason</code>·returned·when·an·error·occurs·are:</p><ul><li><code·class="inline">bad_object</code>,·<code·class="inline">{bad_object,·FileName}</code>·-·Applying·the·format·function·failed
227 for·some·binary,·or·the·key(s)·could·not·be·extracted·from·some·term.</li><li><code·class="inline">{bad_term,·FileName}</code>·-·<a·href="io.html#read/2"><code·class="inline">io:read/2</code></a>·failed·to·read·some·term.</li><li><code·class="inline">{file_error,·FileName,·file:posix()}</code>·-·For·an·explanation·of227 for·some·binary,·or·the·key(s)·could·not·be·extracted·from·some·term.</li><li><code·class="inline">{bad_term,·FileName}</code>·-·<a·href="io.html#read/2"><code·class="inline">io:read/2</code></a>·failed·to·read·some·term.</li><li><code·class="inline">{file_error,·FileName,·file:posix()}</code>·-·For·an·explanation·of
228 <a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:posix/0"><code·class="inline">file:posix()</code></a>,·see·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>.</li><li><code·class="inline">{premature_eof,·FileName}</code>·-·End-of-file·was·encountered·inside·some·binary228 <a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:posix/0"><code·class="inline">file:posix()</code></a>,·see·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>.</li><li><code·class="inline">{premature_eof,·FileName}</code>·-·End-of-file·was·encountered·inside·some·binary
229 term.</li></ul>229 term.</li></ul>
230 ····</section>230 ····</section>
  
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1830 ······<p·class="built-using">1830 ······<p·class="built-using">
1831 ········Built·using1831 ········Built·using
1832 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1832 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1833 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1833 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1834 ······</p>1834 ······</p>
1835 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1835 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1836 ····</footer>1836 ····</footer>
1837 ··</div>1837 ··</div>
1838 </main>1838 </main>
1839 </div>1839 </div>
1840 <script>1840 <script>
1841 ··function·mermaidLoaded()·{1841 ··function·mermaidLoaded()·{
1842 ····mermaid.initialize({1842 ····mermaid.initialize({
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986 ································Cwd·::·<a·href="#t:filename_all/0">filename_all</a>(),986 ································Cwd·::·<a·href="#t:filename_all/0">filename_all</a>(),
987 ································SafeFilename·::·<a·href="#t:filename_all/0">filename_all</a>().</pre>987 ································SafeFilename·::·<a·href="#t:filename_all/0">filename_all</a>().</pre>
  
988 ······</div>988 ······</div>
  
989 <p>Sanitizes·the·relative·path·by·eliminating·&quot;..&quot;·and·&quot;.&quot;·components·to·protect989 <p>Sanitizes·the·relative·path·by·eliminating·&quot;..&quot;·and·&quot;.&quot;·components·to·protect
990 against·directory·traversal·attacks.</p><p>Either·returns·the·sanitized·path·name,·or·the·atom·<code·class="inline">unsafe</code>·if·the·path·is·unsafe.990 against·directory·traversal·attacks.</p><p>Either·returns·the·sanitized·path·name,·or·the·atom·<code·class="inline">unsafe</code>·if·the·path·is·unsafe.
991 The·path·is·considered·unsafe·in·the·following·circumstances:</p><ul><li>The·path·is·not·relative.</li><li>A·&quot;..&quot;·component·would·climb·up·above·the·root·of·the·relative·path.</li><li>A·symbolic·link·in·the·path·points·above·the·root·of·the·relative·path.</li></ul><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="0194149371-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0194149371-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·166,·SHA:·ff34644bd86fa1223cc2badc57c2971d68692d758c175347e7e96c4d11cda9f5·...·]1-2">)</span><span·class="p">.</span><span·class="w">991 The·path·is·considered·unsafe·in·the·following·circumstances:</p><ul><li>The·path·is·not·relative.</li><li>A·&quot;..&quot;·component·would·climb·up·above·the·root·of·the·relative·path.</li><li>A·symbolic·link·in·the·path·points·above·the·root·of·the·relative·path.</li></ul><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="0909744331-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0909744331-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·166,·SHA:·13707ee515bba08abc502ac4f005355dad0cf360ec3b8fa6910658f31b856630·...·]1-2">)</span><span·class="p">.</span><span·class="w">
992 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">992 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="gp·unselectable">
993 2&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0194149371-3">(</span><span·class="s">&quot;dir/sub_dir/..&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0194149371-3">)</span><span·class="p">.</span><span·class="w">993 2&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0909744331-3">(</span><span·class="s">&quot;dir/sub_dir/..&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0909744331-3">)</span><span·class="p">.</span><span·class="w">
994 </span><span·class="s">&quot;dir&quot;</span><span·class="gp·unselectable">994 </span><span·class="s">&quot;dir&quot;</span><span·class="gp·unselectable">
995 3&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0194149371-4">(</span><span·class="s">&quot;dir/..&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0194149371-4">)</span><span·class="p">.</span><span·class="w">995 3&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0909744331-4">(</span><span·class="s">&quot;dir/..&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0909744331-4">)</span><span·class="p">.</span><span·class="w">
996 </span><span·class="p"·data-group-id="0194149371-5">[</span><span·class="p"·data-group-id="0194149371-5">]</span><span·class="gp·unselectable">996 </span><span·class="p"·data-group-id="0909744331-5">[</span><span·class="p"·data-group-id="0909744331-5">]</span><span·class="gp·unselectable">
997 4&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0194149371-6">(</span><span·class="s">&quot;dir/../..&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0194149371-6">)</span><span·class="p">.</span><span·class="w">997 4&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0909744331-6">(</span><span·class="s">&quot;dir/../..&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0909744331-6">)</span><span·class="p">.</span><span·class="w">
998 </span><span·class="ss">unsafe</span><span·class="gp·unselectable">998 </span><span·class="ss">unsafe</span><span·class="gp·unselectable">
999 5&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0194149371-7">(</span><span·class="s">&quot;/abs/path&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0194149371-7">)</span><span·class="p">.</span><span·class="w">999 5&gt;·</span><span·class="nc">filelib</span><span·class="p">:</span><span·class="nf">safe_relative_path</span><span·class="p"·data-group-id="0909744331-7">(</span><span·class="s">&quot;/abs/path&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Cwd</span><span·class="p"·data-group-id="0909744331-7">)</span><span·class="p">.</span><span·class="w">
1000 </span><span·class="ss">unsafe</span></code></pre>1000 </span><span·class="ss">unsafe</span></code></pre>
1001 ··</section>1001 ··</section>
1002 </section>1002 </section>
1003 <section·class="detail"·id="wildcard/1">1003 <section·class="detail"·id="wildcard/1">
  
1004 ··<div·class="detail-header">1004 ··<div·class="detail-header">
1005 ····<a·href="#wildcard/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1005 ····<a·href="#wildcard/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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1090 ······<p·class="built-using">1090 ······<p·class="built-using">
1091 ········Built·using1091 ········Built·using
1092 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1092 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1093 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1093 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1094 ······</p>1094 ······</p>
1095 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1095 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1096 ····</footer>1096 ····</footer>
1097 ··</div>1097 ··</div>
1098 </main>1098 </main>
1099 </div>1099 </div>
1100 <script>1100 <script>
1101 ··function·mermaidLoaded()·{1101 ··function·mermaidLoaded()·{
1102 ····mermaid.initialize({1102 ····mermaid.initialize({
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514 ··········<pre·translate="no"><span·class="attribute">-spec</span>·absname(Filename)·->·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename_all/0">file:filename_all</a>()·when·Filename·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>().</pre>514 ··········<pre·translate="no"><span·class="attribute">-spec</span>·absname(Filename)·->·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename_all/0">file:filename_all</a>()·when·Filename·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>().</pre>
  
515 ······</div>515 ······</div>
  
516 <p>Converts·a·relative·<code·class="inline">Filename</code>·and·returns·an·absolute·name.·No·attempt·is·made516 <p>Converts·a·relative·<code·class="inline">Filename</code>·and·returns·an·absolute·name.·No·attempt·is·made
517 to·create·the·shortest·absolute·name,·as·this·can·give·incorrect·results·on·file517 to·create·the·shortest·absolute·name,·as·this·can·give·incorrect·results·on·file
518 systems·that·allow·links.</p><p><em>Unix·examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">pwd</span><span·class="p"·data-group-id="5995139377-1">(</span><span·class="p"·data-group-id="5995139377-1">)</span><span·class="p">.</span><span·class="w">518 systems·that·allow·links.</p><p><em>Unix·examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">pwd</span><span·class="p"·data-group-id="7964937144-1">(</span><span·class="p"·data-group-id="7964937144-1">)</span><span·class="p">.</span><span·class="w">
519 </span><span·class="s">&quot;/usr/local&quot;</span><span·class="gp·unselectable">519 </span><span·class="s">&quot;/usr/local&quot;</span><span·class="gp·unselectable">
520 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="5995139377-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="5995139377-2">)</span><span·class="p">.</span><span·class="w">520 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="7964937144-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="7964937144-2">)</span><span·class="p">.</span><span·class="w">
521 </span><span·class="s">&quot;/usr/local/foo&quot;</span><span·class="gp·unselectable">521 </span><span·class="s">&quot;/usr/local/foo&quot;</span><span·class="gp·unselectable">
522 3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="5995139377-3">(</span><span·class="s">&quot;../x&quot;</span><span·class="p"·data-group-id="5995139377-3">)</span><span·class="p">.</span><span·class="w">522 3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="7964937144-3">(</span><span·class="s">&quot;../x&quot;</span><span·class="p"·data-group-id="7964937144-3">)</span><span·class="p">.</span><span·class="w">
523 </span><span·class="s">&quot;/usr/local/../x&quot;</span><span·class="gp·unselectable">523 </span><span·class="s">&quot;/usr/local/../x&quot;</span><span·class="gp·unselectable">
524 4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="5995139377-4">(</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="5995139377-4">)</span><span·class="p">.</span><span·class="w">524 4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="7964937144-4">(</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="7964937144-4">)</span><span·class="p">.</span><span·class="w">
525 </span><span·class="s">&quot;/&quot;</span></code></pre><p><em>Windows·examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">pwd</span><span·class="p"·data-group-id="3731598668-1">(</span><span·class="p"·data-group-id="3731598668-1">)</span><span·class="p">.</span><span·class="w">525 </span><span·class="s">&quot;/&quot;</span></code></pre><p><em>Windows·examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">pwd</span><span·class="p"·data-group-id="6876935776-1">(</span><span·class="p"·data-group-id="6876935776-1">)</span><span·class="p">.</span><span·class="w">
526 </span><span·class="s">&quot;D:/usr/local&quot;</span><span·class="gp·unselectable">526 </span><span·class="s">&quot;D:/usr/local&quot;</span><span·class="gp·unselectable">
527 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="3731598668-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="3731598668-2">)</span><span·class="p">.</span><span·class="w">527 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="6876935776-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="6876935776-2">)</span><span·class="p">.</span><span·class="w">
528 </span><span·class="s">&quot;D:/usr/local/foo&quot;</span><span·class="gp·unselectable">528 </span><span·class="s">&quot;D:/usr/local/foo&quot;</span><span·class="gp·unselectable">
529 3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="3731598668-3">(</span><span·class="s">&quot;../x&quot;</span><span·class="p"·data-group-id="3731598668-3">)</span><span·class="p">.</span><span·class="w">529 3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="6876935776-3">(</span><span·class="s">&quot;../x&quot;</span><span·class="p"·data-group-id="6876935776-3">)</span><span·class="p">.</span><span·class="w">
530 </span><span·class="s">&quot;D:/usr/local/../x&quot;</span><span·class="gp·unselectable">530 </span><span·class="s">&quot;D:/usr/local/../x&quot;</span><span·class="gp·unselectable">
531 4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="3731598668-4">(</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="3731598668-4">)</span><span·class="p">.</span><span·class="w">531 4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">absname</span><span·class="p"·data-group-id="6876935776-4">(</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="6876935776-4">)</span><span·class="p">.</span><span·class="w">
532 </span><span·class="s">&quot;D:/&quot;</span></code></pre>532 </span><span·class="s">&quot;D:/&quot;</span></code></pre>
533 ··</section>533 ··</section>
534 </section>534 </section>
535 <section·class="detail"·id="absname/2">535 <section·class="detail"·id="absname/2">
  
536 ··<div·class="detail-header">536 ··<div·class="detail-header">
537 ····<a·href="#absname/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">537 ····<a·href="#absname/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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659 ······</div>659 ······</div>
  
660 <p><a·href=""·id="basedir_3_1"></a>·<a·href=""·id="basedir_3_2"></a></p><p>Returns·a·suitable·path,·or·paths,·for·a·given·type.·If·<code·class="inline">os</code>·is·not·set·in660 <p><a·href=""·id="basedir_3_1"></a>·<a·href=""·id="basedir_3_2"></a></p><p>Returns·a·suitable·path,·or·paths,·for·a·given·type.·If·<code·class="inline">os</code>·is·not·set·in
661 <code·class="inline">Opts</code>·the·function·will·default·to·the·native·option,·that·is·<code·class="inline">'linux'</code>,661 <code·class="inline">Opts</code>·the·function·will·default·to·the·native·option,·that·is·<code·class="inline">'linux'</code>,
662 <code·class="inline">'darwin'</code>·or·<code·class="inline">'windows'</code>,·as·understood·by·<a·href="../../../../lib/kernel-10.2.6/doc/html/os.html#type/0"><code·class="inline">os:type/0</code></a>.·Anything·not·recognized662 <code·class="inline">'darwin'</code>·or·<code·class="inline">'windows'</code>,·as·understood·by·<a·href="../../../../lib/kernel-10.2.6/doc/html/os.html#type/0"><code·class="inline">os:type/0</code></a>.·Anything·not·recognized
663 as·<code·class="inline">'darwin'</code>·or·<code·class="inline">'windows'</code>·is·interpreted·as·<code·class="inline">'linux'</code>.</p><p>The·options·<code·class="inline">'author'</code>·and·<code·class="inline">'version'</code>·are·only·used·with·<code·class="inline">'windows'</code>·option663 as·<code·class="inline">'darwin'</code>·or·<code·class="inline">'windows'</code>·is·interpreted·as·<code·class="inline">'linux'</code>.</p><p>The·options·<code·class="inline">'author'</code>·and·<code·class="inline">'version'</code>·are·only·used·with·<code·class="inline">'windows'</code>·option
664 mode.</p><ul><li><p><code·class="inline"·id="user_cache">user_cache</code></p><p>The·path·location·is·intended·for·transient·data·files·on·a·local·machine.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CACHE_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="9594325161-1">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9594325161-2">#{</span><[·...·truncated·by·diffoscope;·len:·175,·SHA:·8014aec1907abaffbdbe0dcc2f0fc6b8b6f9df7d25173c3e3074c4643f3b8d4d·...·]1-1">)</span><span·class="p">.</span><span·class="w">664 mode.</p><ul><li><p><code·class="inline"·id="user_cache">user_cache</code></p><p>The·path·location·is·intended·for·transient·data·files·on·a·local·machine.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CACHE_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3549931041-1">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3549931041-2">#{</span><[·...·truncated·by·diffoscope;·len:·175,·SHA:·f8f12401515dbeba2b6d213713a2b1c9ade096ab30b738960db5c02f26df08ed·...·]1-1">)</span><span·class="p">.</span><span·class="w">
665 </span><span·class="s">&quot;/home/otptest/.cache/my_application&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1833578376-1">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1833578376-2">#{</span><[·...·truncated·by·diffoscope;·len:·177,·SHA:·dfa406215c322bf4cb2fb9a7d4c11655827acd36cf88d18332ca4f02a505d512·...·]-1">)</span><span·class="p">.</span><span·class="w">665 </span><span·class="s">&quot;/home/otptest/.cache/my_application&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3962820832-1">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3962820832-2">#{</span><[·...·truncated·by·diffoscope;·len:·177,·SHA:·63d728f12a740e38a0a1b65ea5156c0453d915558b9d66480f212ac1a859c949·...·]-1">)</span><span·class="p">.</span><span·class="w">
666 </span><span·class="s">&quot;/home/otptest/Library/Caches/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="4526316367-1">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="4526316367-1">)</span><span·class="p">.</span><span·class="w">666 </span><span·class="s">&quot;/home/otptest/Library/Caches/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5000038397-1">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="5000038397-1">)</span><span·class="p">.</span><span·class="w">
667 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/Cache&quot;</span><span·class="gp·unselectable">667 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/Cache&quot;</span><span·class="gp·unselectable">
668 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="4526316367-2">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="4526316367-2">)</span><span·class="p">.</span><span·class="w">668 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5000038397-2">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="5000038397-2">)</span><span·class="p">.</span><span·class="w">
669 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/Cache&quot;</span><span·class="gp·unselectable">669 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/Cache&quot;</span><span·class="gp·unselectable">
670 3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="4526316367-3">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4526316367-4">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·183,·SHA:·605c0806bf2c589dcf8a46fedb7ef4988892be858a73dbd4983fe90ec59424b5·...·]7-3">)</span><span·class="p">.</span><span·class="w">670 3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5000038397-3">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5000038397-4">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·183,·SHA:·7663bad8746f09176a4c3dde82eae74f2823306a55ba375a6bb6e93d8ee8c1a6·...·]7-3">)</span><span·class="p">.</span><span·class="w">
671 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/Cache&quot;</span><span·class="gp·unselectable">671 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/Cache&quot;</span><span·class="gp·unselectable">
672 4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="4526316367-5">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4526316367-6">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·181,·SHA:·f9c3da9cac81482a37bb83b95c290cc5124fcc4280b82babc4848701a6c6a895·...·]7-5">)</span><span·class="p">.</span><span·class="w">672 4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5000038397-5">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5000038397-6">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·181,·SHA:·fe7db9ccbdbbfc30d2363f96b193287e17a3ae516446c779fd15f76019b9e530·...·]7-5">)</span><span·class="p">.</span><span·class="w">
673 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/1.2/Cache&quot;</span><span·class="gp·unselectable">673 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/1.2/Cache&quot;</span><span·class="gp·unselectable">
674 5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="4526316367-7">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4526316367-8">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·304,·SHA:·1099bd60fd90bcdd2d8dde571387347aee091f5664869077dd360399458eb770·...·]7-7">)</span><span·class="p">.</span><span·class="w">674 5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5000038397-7">(</span><span·class="ss">user_cache</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5000038397-8">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·304,·SHA:·553635609328154dbb3a5a46f7dde1642d4a9d7ec0ab3303c6d331e65f39e026·...·]7-7">)</span><span·class="p">.</span><span·class="w">
675 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/1.2/Cache&quot;</span></code></pre></li><li><p><code·class="inline"·id="user_config">user_config</code></p><p>The·path·location·is·intended·for·persistent·configuration·files.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CONFIG_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="2761855078-1">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2761855078-2">#{</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·6949a2c5caa5408d7e74c4a38e177f6305e2bbef8918541c502325f37c6e22e1·...·]-1">)</span><span·class="p">.</span><span·class="w">675 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/1.2/Cache&quot;</span></code></pre></li><li><p><code·class="inline"·id="user_config">user_config</code></p><p>The·path·location·is·intended·for·persistent·configuration·files.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CONFIG_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5599417489-1">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5599417489-2">#{</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·e1c6de0a09d66ecdd83a1c10455921941ce8332fc573da1510941c74ab2c4527·...·]-1">)</span><span·class="p">.</span><span·class="w">
676 </span><span·class="s">&quot;/home/otptest/.config/my_application&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3050345161-1">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3050345161-2">#{</span>[·...·truncated·by·diffoscope;·len:·178,·SHA:·eea4b43768a4635364c48ad8f0e9eb1232ec6eba658cc6994fee79d49deebaf4·...·]-1">)</span><span·class="p">.</span><span·class="w">676 </span><span·class="s">&quot;/home/otptest/.config/my_application&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="8121013545-1">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8121013545-2">#{</span>[·...·truncated·by·diffoscope;·len:·178,·SHA:·5c7625dea97f28daab0a167e5c0d8ff5940c04c73a677f53925c250ea87ad519·...·]-1">)</span><span·class="p">.</span><span·class="w">
677 </span><span·class="s">&quot;/home/otptest/Library/Application·Support/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="9209114721-1">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="9209114721-1">)</span><span·class="p">.</span><span·class="w">677 </span><span·class="s">&quot;/home/otptest/Library/Application·Support/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="9183667743-1">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="9183667743-1">)</span><span·class="p">.</span><span·class="w">
678 </span><span·class="s">&quot;c:/Users/otptest/AppData/Roaming/My·App&quot;</span><span·class="gp·unselectable">678 </span><span·class="s">&quot;c:/Users/otptest/AppData/Roaming/My·App&quot;</span><span·class="gp·unselectable">
679 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="9209114721-2">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9209114721-3">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·329,·SHA:·1a4f390601fe90701822766619b15c85649701df2e25773fc5e8c9636bb16aba·...·]-2">)</span><span·class="p">.</span><span·class="w">679 2&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="9183667743-2">(</span><span·class="ss">user_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9183667743-3">#{</span><span·cla[·...·truncated·by·diffoscope;·len:·329,·SHA:·b6d5d39c392d96371ce3b604aa70f10b9b39c3b2a040368dd7a3c9eeceff9b7b·...·]-2">)</span><span·class="p">.</span><span·class="w">
680 </span><span·class="s">&quot;c:/Users/otptest/AppData/Roaming/Erlang/My·App/1.2&quot;</span></code></pre></li><li><p><code·class="inline"·id="user_data">user_data</code></p><p>The·path·location·is·intended·for·persistent·data·files.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_DATA_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3598436149-1">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3598436149-2">#{</span><s[·...·truncated·by·diffoscope;·len:·175,·SHA:·958e5999ee308819ada20f8d9fa19bed30f46435a16dca8bdf767e344715f16e·...·]-1">)</span><span·class="p">.</span><span·class="w">680 </span><span·class="s">&quot;c:/Users/otptest/AppData/Roaming/Erlang/My·App/1.2&quot;</span></code></pre></li><li><p><code·class="inline"·id="user_data">user_data</code></p><p>The·path·location·is·intended·for·persistent·data·files.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_DATA_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="6629409232-1">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6629409232-2">#{</span><s[·...·truncated·by·diffoscope;·len:·175,·SHA:·2bd95fefd527149c816c7d6f34f56ef3b468d7fc61afd3e230e191e46365601e·...·]-1">)</span><span·class="p">.</span><span·class="w">
681 </span><span·class="s">&quot;/home/otptest/.local/my_application&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="7148717806-1">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7148717806-2">#{</span><s[·...·truncated·by·diffoscope;·len:·176,·SHA:·c8670390ef225df74947e3e83645ad24b877433be0eda0173b723dd764c59181·...·]-1">)</span><span·class="p">.</span><span·class="w">681 </span><span·class="s">&quot;/home/otptest/.local/my_application&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0030885133-1">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0030885133-2">#{</span><s[·...·truncated·by·diffoscope;·len:·176,·SHA:·c1a5a8f02c42126720d6717c2d39f9188d3fe024912c37b9b31c654b389cae7a·...·]-1">)</span><span·class="p">.</span><span·class="w">
682 </span><span·class="s">&quot;/home/otptest/Library/Application·Support/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1142532870-1">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="1142532870-1">)</span><span·class="p">.</span><span·class="w">682 </span><span·class="s">&quot;/home/otptest/Library/Application·Support/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0003464405-1">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="0003464405-1">)</span><span·class="p">.</span><span·class="w">
683 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App&quot;</span><span·class="gp·unselectable">683 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App&quot;</span><span·class="gp·unselectable">
684 9&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1142532870-2">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1142532870-3">#{</span><span·class="ss">author</span><spa[·...·truncated·by·diffoscope;·len:·280,·SHA:·56c98d3da6af48fd31adc319374357c6a892e0c0980a12272758423ec7148e53·...·]-2">)</span><span·class="p">.</span><span·class="w">684 9&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0003464405-2">(</span><span·class="ss">user_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0003464405-3">#{</span><span·class="ss">author</span><spa[·...·truncated·by·diffoscope;·len:·280,·SHA:·de753a7637870fb2b0ca3119f6668c6648df7b6b421173535b0405dd217cc2e0·...·]-2">)</span><span·class="p">.</span><span·class="w">
685 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/1.2&quot;</span></code></pre></li><li><p><code·class="inline"·id="user_log">user_log</code></p><p>The·path·location·is·intended·for·transient·log·files·on·a·local·machine.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CACHE_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3276360727-1">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3276360727-2">#{</span><sp[·...·truncated·by·diffoscope;·len:·174,·SHA:·f74762037040cf4ebe018fd3a525e733945587b4ba9c33fd513ecb76992b1bed·...·]-1">)</span><span·class="p">.</span><span·class="w">685 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/1.2&quot;</span></code></pre></li><li><p><code·class="inline"·id="user_log">user_log</code></p><p>The·path·location·is·intended·for·transient·log·files·on·a·local·machine.</p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CACHE_HOME</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="9822170705-1">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9822170705-2">#{</span><sp[·...·truncated·by·diffoscope;·len:·174,·SHA:·f6fb3d65b782438f29c076eaa9317a7ab3186902230c8366c2445b1c248afc6e·...·]-1">)</span><span·class="p">.</span><span·class="w">
686 </span><span·class="s">&quot;/home/otptest/.cache/my_application/log&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="5962558999-1">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5962558999-2">#{</span><sp[·...·truncated·by·diffoscope;·len:·175,·SHA:·05ef022198acc6468a401f2c16f71b8fce7fe5d843d84f8dbcd003438b806a08·...·]-1">)</span><span·class="p">.</span><span·class="w">686 </span><span·class="s">&quot;/home/otptest/.cache/my_application/log&quot;</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0825389303-1">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0825389303-2">#{</span><sp[·...·truncated·by·diffoscope;·len:·175,·SHA:·91dc2e895ac597d10976cc6a957a64fe139660dd2725e882ce00779c566eca64·...·]-1">)</span><span·class="p">.</span><span·class="w">
687 </span><span·class="s">&quot;/home/otptest/Library/Logs/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">12&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1360617309-1">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="1360617309-1">)</span><span·class="p">.</span><span·class="w">687 </span><span·class="s">&quot;/home/otptest/Library/Logs/my_application&quot;</span></code></pre><p>On·Windows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">12&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1184755777-1">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p"·data-group-id="1184755777-1">)</span><span·class="p">.</span><span·class="w">
688 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/Logs&quot;</span><span·class="gp·unselectable">688 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/My·App/Logs&quot;</span><span·class="gp·unselectable">
689 13&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1360617309-2">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1360617309-3">#{</span><span·class="ss">author</span><span·[·...·truncated·by·diffoscope;·len:·278,·SHA:·10d434edd53beaa6e2701310ccedc25aaf782f9cee62e60fa8acdf80c64f86db·...·]-2">)</span><span·class="p">.</span><span·class="w">689 13&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="1184755777-2">(</span><span·class="ss">user_log</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;My·App&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1184755777-3">#{</span><span·class="ss">author</span><span·[·...·truncated·by·diffoscope;·len:·278,·SHA:·2dea25dc9446ba56bbabe87cf730aea07b3ec561aa7193971139af23f79afc47·...·]-2">)</span><span·class="p">.</span><span·class="w">
690 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/1.2/Logs&quot;</span></code></pre></li><li><p><code·class="inline"·id="site_config">site_config</code></p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CONFIG_DIRS</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="7968536354-1">(</span><span·class="ss">site_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7968536354-2">#{</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·dbfe871bc985c0d9b68a233032d26d70446855a4ac9c74e411670c5ddc97a3a6·...·]-1">)</span><span·class="p">.</span><span·class="w">690 </span><span·class="s">&quot;c:/Users/otptest/AppData/Local/Erlang/My·App/1.2/Logs&quot;</span></code></pre></li><li><p><code·class="inline"·id="site_config">site_config</code></p><p>On·Linux:·Respects·the·os·environment·variable·<code·class="inline">XDG_CONFIG_DIRS</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0595941749-1">(</span><span·class="ss">site_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0595941749-2">#{</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·5b1c4757e7df14a6111ec870a6e129d19d81713a4de0b9c390cb876dcd48556f·...·]-1">)</span><span·class="p">.</span><span·class="w">
691 </span><span·class="p"·data-group-id="7968536354-3">[</span><span·class="s">&quot;/usr/local/share/my_application&quot;</span><span·class="p">,</span><span·class="w">691 </span><span·class="p"·data-group-id="0595941749-3">[</span><span·class="s">&quot;/usr/local/share/my_application&quot;</span><span·class="p">,</span><span·class="w">
692 ·</span><span·class="s">&quot;/usr/share/my_application&quot;</span><span·class="p"·data-group-id="7968536354-3">]</span><span·class="gp·unselectable">692 ·</span><span·class="s">&quot;/usr/share/my_application&quot;</span><span·class="p"·data-group-id="0595941749-3">]</span><span·class="gp·unselectable">
693 6&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">getenv</span><span·class="p"·data-group-id="7968536354-4">(</span><span·class="s">&quot;XDG_CONFIG_DIRS&quot;</span><span·class="p"·data-group-id="7968536354-4">)</span><span·class="p">.</span><span·class="w">693 6&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">getenv</span><span·class="p"·data-group-id="0595941749-4">(</span><span·class="s">&quot;XDG_CONFIG_DIRS&quot;</span><span·class="p"·data-group-id="0595941749-4">)</span><span·class="p">.</span><span·class="w">
694 </span><span·class="s">&quot;/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg&quot;</span><span·class="gp·unselectable">694 </span><span·class="s">&quot;/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg&quot;</span><span·class="gp·unselectable">
695 7&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="7968536354-5">(</span><span·class="ss">site_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7968536354-6">#{</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·0e11eb2e27b2c67d6ec2be1589297cbd8d39da34f08014ddd334d8b854d5df65·...·]-5">)</span><span·class="p">.</span><span·class="w">695 7&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0595941749-5">(</span><span·class="ss">site_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0595941749-6">#{</span>[·...·truncated·by·diffoscope;·len:·177,·SHA:·8826b81d790cf4f764a668b70380acc8ac98bd69f23d2c3eeb8d4752b357954d·...·]-5">)</span><span·class="p">.</span><span·class="w">
696 </span><span·class="p"·data-group-id="7968536354-7">[</span><span·class="s">&quot;/etc/xdg/xdg-ubuntu/my_application&quot;</span><span·class="p">,</span><span·class="w">696 </span><span·class="p"·data-group-id="0595941749-7">[</span><span·class="s">&quot;/etc/xdg/xdg-ubuntu/my_application&quot;</span><span·class="p">,</span><span·class="w">
697 ·</span><span·class="s">&quot;/usr/share/upstart/xdg/my_application&quot;</span><span·class="p">,</span><span·class="w">697 ·</span><span·class="s">&quot;/usr/share/upstart/xdg/my_application&quot;</span><span·class="p">,</span><span·class="w">
698 ·</span><span·class="s">&quot;/etc/xdg/my_application&quot;</span><span·class="p"·data-group-id="7968536354-7">]</span><span·class="gp·unselectable">698 ·</span><span·class="s">&quot;/etc/xdg/my_application&quot;</span><span·class="p"·data-group-id="0595941749-7">]</span><span·class="gp·unselectable">
699 8&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">unsetenv</span><span·class="p"·data-group-id="7968536354-8">(</span><span·class="s">&quot;XDG_CONFIG_DIRS&quot;</span><span·class="p"·data-group-id="7968536354-8">)</span><span·class="p">.</span><span·class="w">699 8&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">unsetenv</span><span·class="p"·data-group-id="0595941749-8">(</span><span·class="s">&quot;XDG_CONFIG_DIRS&quot;</span><span·class="p"·data-group-id="0595941749-8">)</span><span·class="p">.</span><span·class="w">
700 </span><span·class="ss">true</span><span·class="gp·unselectable">700 </span><span·class="ss">true</span><span·class="gp·unselectable">
701 9&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="7968536354-9">(</span><span·class="ss">site_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7968536354-10">#{</span[·...·truncated·by·diffoscope;·len:·179,·SHA:·07d4fc6aca04cbe02d3bf153b566c4320f8c78588804636411a3e5d6b1672b64·...·]-9">)</span><span·class="p">.</span><span·class="w">701 9&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="0595941749-9">(</span><span·class="ss">site_config</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0595941749-10">#{</span[·...·truncated·by·diffoscope;·len:·179,·SHA:·62aee0c0fd29b0811de7e9d6bbca252b16fc84da0e5c014d5d04f29478b07cc1·...·]-9">)</span><span·class="p">.</span><span·class="w">
702 </span><span·class="p"·data-group-id="7968536354-11">[</span><span·class="s">&quot;/etc/xdg/my_application&quot;</span><span·class="p"·data-group-id="7968536354-11">]</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span>[·...·truncated·by·diffoscope;·len:·552,·SHA:·c8bd9f3a06394b968fd69afeb9d47ee33bbda507c8ee8dbffee0aff10390351d·...·]-1">)</span><span·class="p">.</span><span·class="w">702 </span><span·class="p"·data-group-id="0595941749-11">[</span><span·class="s">&quot;/etc/xdg/my_application&quot;</span><span·class="p"·data-group-id="0595941749-11">]</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span>[·...·truncated·by·diffoscope;·len:·552,·SHA:·38435745178a84fc1077202a84c82f014aa0849e88ce56c29acbc77612611a68·...·]-1">)</span><span·class="p">.</span><span·class="w">
703 </span><span·class="p"·data-group-id="6640442966-3">[</span><span·class="s">&quot;/Library/Application·Support/my_application&quot;</span><span·class="p"·data-group-id="6640442966-3">]</span></code></pre></li><li><p><code·class="inline"·id="site_data">site_data</code></p><p>On·Linux:·Respects·t[·...·truncated·by·diffoscope;·len:·387,·SHA:·810b6d0dec83d4c49fe4eeacae1ab30fe71971a28b6b7ff59a9cb3e4e39ac1c6·...·]-1">)</span><span·class="p">.</span><span·class="w">703 </span><span·class="p"·data-group-id="6951089645-3">[</span><span·class="s">&quot;/Library/Application·Support/my_application&quot;</span><span·class="p"·data-group-id="6951089645-3">]</span></code></pre></li><li><p><code·class="inline"·id="site_data">site_data</code></p><p>On·Linux:·Respects·t[·...·truncated·by·diffoscope;·len:·387,·SHA:·166e626da16aee69d4192f4c1d4f4db2f0b22edb1e2a70d5910331127d6aee7c·...·]-1">)</span><span·class="p">.</span><span·class="w">
704 </span><span·class="s">&quot;/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/&quot;</span><span·class="gp·unselectable">704 </span><span·class="s">&quot;/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/&quot;</span><span·class="gp·unselectable">
705 11&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3747500278-2">(</span><span·class="ss">site_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3747500278-3">#{</span><s[·...·truncated·by·diffoscope;·len:·175,·SHA:·31250305f4043e8ab850052db40cf51e8ac533131453e605979065686b4dd05c·...·]-2">)</span><span·class="p">.</span><span·class="w">705 11&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="8468221320-2">(</span><span·class="ss">site_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8468221320-3">#{</span><s[·...·truncated·by·diffoscope;·len:·175,·SHA:·e785399fab783898257e5da5c089cfadf39642ca6fd5c37682c540414d128711·...·]-2">)</span><span·class="p">.</span><span·class="w">
706 </span><span·class="p"·data-group-id="3747500278-4">[</span><span·class="s">&quot;/usr/share/ubuntu/my_application&quot;</span><span·class="p">,</span><span·class="w">706 </span><span·class="p"·data-group-id="8468221320-4">[</span><span·class="s">&quot;/usr/share/ubuntu/my_application&quot;</span><span·class="p">,</span><span·class="w">
707 ·</span><span·class="s">&quot;/usr/share/gnome/my_application&quot;</span><span·class="p">,</span><span·class="w">707 ·</span><span·class="s">&quot;/usr/share/gnome/my_application&quot;</span><span·class="p">,</span><span·class="w">
708 ·</span><span·class="s">&quot;/usr/local/share/my_application&quot;</span><span·class="p">,</span><span·class="w">708 ·</span><span·class="s">&quot;/usr/local/share/my_application&quot;</span><span·class="p">,</span><span·class="w">
709 ·</span><span·class="s">&quot;/usr/share/my_application&quot;</span><span·class="p"·data-group-id="3747500278-4">]</span><span·class="gp·unselectable">709 ·</span><span·class="s">&quot;/usr/share/my_application&quot;</span><span·class="p"·data-group-id="8468221320-4">]</span><span·class="gp·unselectable">
710 12&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">unsetenv</span><span·class="p"·data-group-id="3747500278-5">(</span><span·class="s">&quot;XDG_DATA_DIRS&quot;</span><span·class="p"·data-group-id="3747500278-5">)</span><span·class="p">.</span><span·class="w">710 12&gt;·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">unsetenv</span><span·class="p"·data-group-id="8468221320-5">(</span><span·class="s">&quot;XDG_DATA_DIRS&quot;</span><span·class="p"·data-group-id="8468221320-5">)</span><span·class="p">.</span><span·class="w">
711 </span><span·class="ss">true</span><span·class="gp·unselectable">711 </span><span·class="ss">true</span><span·class="gp·unselectable">
712 13&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="3747500278-6">(</span><span·class="ss">site_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3747500278-7">#{</span><s[·...·truncated·by·diffoscope;·len:·175,·SHA:·208b7db64820e803ace705d45140930eab97ba7b4553c028ed358f44b29180df·...·]-6">)</span><span·class="p">.</span><span·class="w">712 13&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group-id="8468221320-6">(</span><span·class="ss">site_data</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;my_application&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8468221320-7">#{</span><s[·...·truncated·by·diffoscope;·len:·175,·SHA:·b7d4156e747c26420592577f029899c3a2122ac5da926d9457f5f1b6abd320da·...·]-6">)</span><span·class="p">.</span><span·class="w">
713 </span><span·class="p"·data-group-id="3747500278-8">[</span><span·class="s">&quot;/usr/local/share/my_application&quot;</span><span·class="p">,</span><span·class="w">713 </span><span·class="p"·data-group-id="8468221320-8">[</span><span·class="s">&quot;/usr/local/share/my_application&quot;</span><span·class="p">,</span><span·class="w">
714 ·</span><span·class="s">&quot;/usr/share/my_application&quot;</span><span·class="p"·data-group-id="3747500278-8">]</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·437,·SHA:·19f7a3293bc16ab3666b6ee239e1bfee2b71c08c5c20e76c56d8786eb4eae2bc·...·]-1">)</span><span·class="p">.</span><span·class="w">714 ·</span><span·class="s">&quot;/usr/share/my_application&quot;</span><span·class="p"·data-group-id="8468221320-8">]</span></code></pre><p>On·Darwin:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basedir</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·437,·SHA:·e81873f18d8742ff5f64ecf2b93a5deaed0ea5fe87061a000cdc0963c6b2f163·...·]-1">)</span><span·class="p">.</span><span·class="w">
715 </span><span·class="p"·data-group-id="0938077100-3">[</span><span·class="s">&quot;/Library/Application·Support/my_application&quot;</span><span·class="p"·data-group-id="0938077100-3">]</span></code></pre></li></ul>715 </span><span·class="p"·data-group-id="3416071392-3">[</span><span·class="s">&quot;/Library/Application·Support/my_application&quot;</span><span·class="p"·data-group-id="3416071392-3">]</span></code></pre></li></ul>
716 ··</section>716 ··</section>
717 </section>717 </section>
718 <section·class="detail"·id="basename/1">718 <section·class="detail"·id="basename/1">
  
719 ··<div·class="detail-header">719 ··<div·class="detail-header">
720 ····<a·href="#basename/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">720 ····<a·href="#basename/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
721 ······<i·class="ri-link-m"·aria-hidden="true"></i>721 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 737, 20 lines modifiedOffset 737, 20 lines modified
737 ······<div·class="specs">737 ······<div·class="specs">
  
738 ··········<pre·translate="no"><span·class="attribute">-spec</span>·basename(Filename)·->·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename_all/0">file:filename_all</a>()·when·Filename·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>().</pre>738 ··········<pre·translate="no"><span·class="attribute">-spec</span>·basename(Filename)·->·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename_all/0">file:filename_all</a>()·when·Filename·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>().</pre>
  
739 ······</div>739 ······</div>
  
740 <p>Returns·the·last·component·of·<code·class="inline">Filename</code>,·or·<code·class="inline">Filename</code>·itself·if·it·does·not740 <p>Returns·the·last·component·of·<code·class="inline">Filename</code>,·or·<code·class="inline">Filename</code>·itself·if·it·does·not
741 contain·any·directory·separators.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3072860090-1">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="3072860090-1">)</span><span·class="p">.</span><span·class="w">741 contain·any·directory·separators.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3921285603-1">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="3921285603-1">)</span><span·class="p">.</span><span·class="w">
742 </span><span·class="s">&quot;foo&quot;</span><span·class="gp·unselectable">742 </span><span·class="s">&quot;foo&quot;</span><span·class="gp·unselectable">
743 6&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3072860090-2">(</span><span·class="s">&quot;/usr/foo&quot;</span><span·class="p"·data-group-id="3072860090-2">)</span><span·class="p">.</span><span·class="w">743 6&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3921285603-2">(</span><span·class="s">&quot;/usr/foo&quot;</span><span·class="p"·data-group-id="3921285603-2">)</span><span·class="p">.</span><span·class="w">
744 </span><span·class="s">&quot;foo&quot;</span><span·class="gp·unselectable">744 </span><span·class="s">&quot;foo&quot;</span><span·class="gp·unselectable">
745 7&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3072860090-3">(</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="3072860090-3">)</span><span·class="p">.</span><span·class="w">745 7&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3921285603-3">(</span><span·class="s">&quot;/&quot;</span><span·class="p"·data-group-id="3921285603-3">)</span><span·class="p">.</span><span·class="w">
746 </span><span·class="p"·data-group-id="3072860090-4">[</span><span·class="p"·data-group-id="3072860090-4">]</span></code></pre>746 </span><span·class="p"·data-group-id="3921285603-4">[</span><span·class="p"·data-group-id="3921285603-4">]</span></code></pre>
747 ··</section>747 ··</section>
748 </section>748 </section>
749 <section·class="detail"·id="basename/2">749 <section·class="detail"·id="basename/2">
  
750 ··<div·class="detail-header">750 ··<div·class="detail-header">
751 ····<a·href="#basename/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">751 ····<a·href="#basename/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
752 ······<i·class="ri-link-m"·aria-hidden="true"></i>752 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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771 ··········<pre·translate="no"><span·class="attribute">-spec</span>·basename(Filename,·Ext)·->·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename_all/0">file:filename_all</a>()771 ··········<pre·translate="no"><span·class="attribute">-spec</span>·basename(Filename,·Ext)·->·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:filename_all/0">file:filename_all</a>()
772 ··················when·Filename·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>(),·Ext·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>().</pre>772 ··················when·Filename·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>(),·Ext·::·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:name_all/0">file:name_all</a>().</pre>
  
773 ······</div>773 ······</div>
  
774 <p>Returns·the·last·component·of·<code·class="inline">Filename</code>·with·extension·<code·class="inline">Ext</code>·stripped.</p><p>This·function·is·to·be·used·to·remove·a·(possible)·specific·extension.774 <p>Returns·the·last·component·of·<code·class="inline">Filename</code>·with·extension·<code·class="inline">Ext</code>·stripped.</p><p>This·function·is·to·be·used·to·remove·a·(possible)·specific·extension.
775 To·remove·an·existing·extension·when·you·are·unsure·which·one·it·is,·use775 To·remove·an·existing·extension·when·you·are·unsure·which·one·it·is,·use
776 <a·href="#rootname/1"><code·class="inline">rootname(basename(Filename))</code></a>.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="2831613617-1">(</span><span·class="s">&quot;~/src/kalle.erl&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.erl&quot;</span><span·class="p"·data-group-id="2831613617-1">)</span><span·class="p">.</span><span·class="w">776 <a·href="#rootname/1"><code·class="inline">rootname(basename(Filename))</code></a>.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3357327282-1">(</span><span·class="s">&quot;~/src/kalle.erl&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.erl&quot;</span><span·class="p"·data-group-id="3357327282-1">)</span><span·class="p">.</span><span·class="w">
777 </span><span·class="s">&quot;kalle&quot;</span><span·class="gp·unselectable">777 </span><span·class="s">&quot;kalle&quot;</span><span·class="gp·unselectable">
778 9&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="2831613617-2">(</span><span·class="s">&quot;~/src/kalle.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.erl&quot;</span><span·class="p"·data-group-id="2831613617-2">)</span><span·class="p">.</span><span·class="w">778 9&gt;·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">basename</span><span·class="p"·data-group-id="3357327282-2">(</span><span·class="s">&quot;~/src/kalle.beam&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.erl&quot;</span><span·class="p"·data-group-id="3357327282-2">)</span><span·class="p">.</span><span·class="w">
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1981 ········Built·using1981 ········Built·using
1982 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1982 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1983 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1983 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1984 ······</p>1984 ······</p>
1985 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1985 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1986 ····</footer>1986 ····</footer>
1987 ··</div>1987 ··</div>
1988 </main>1988 </main>
1989 </div>1989 </div>
1990 <script>1990 <script>
1991 ··function·mermaidLoaded()·{1991 ··function·mermaidLoaded()·{
1992 ····mermaid.initialize({1992 ····mermaid.initialize({
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1539 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1539 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1540 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1540 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1541 ······</p>1541 ······</p>
1542 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1542 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1543 ····</footer>1543 ····</footer>
1544 ··</div>1544 ··</div>
1545 </main>1545 </main>
1546 </div>1546 </div>
1547 <script>1547 <script>
1548 ··function·mermaidLoaded()·{1548 ··function·mermaidLoaded()·{
1549 ····mermaid.initialize({1549 ····mermaid.initialize({
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1267 format/limit·the·server·state·for·debugging·and·logging·purposes.</p><p>It·is·called·in·the·following·situations:</p><ul><li><p>One·of·<a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·is·invoked1267 format/limit·the·server·state·for·debugging·and·logging·purposes.</p><p>It·is·called·in·the·following·situations:</p><ul><li><p>One·of·<a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·is·invoked
1268 to·get·the·<code·class="inline">gen_event</code>·status.</p></li><li><p>The·event·handler·terminates·abnormally·and·<code·class="inline">gen_event</code>·logs·an·error.</p></li></ul><p>This·callback·is·used·to·limit·the·status·of·the·event·handler·returned·by1268 to·get·the·<code·class="inline">gen_event</code>·status.</p></li><li><p>The·event·handler·terminates·abnormally·and·<code·class="inline">gen_event</code>·logs·an·error.</p></li></ul><p>This·callback·is·used·to·limit·the·status·of·the·event·handler·returned·by
1269 <a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·or·sent·to·<a·href="../../../../lib/kernel-10.2.6/doc/html/logger.html"><code·class="inline">logger</code></a>.</p><p>The·callback·gets·a·map·<code·class="inline">Status</code>·describing·the·current·status1269 <a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·or·sent·to·<a·href="../../../../lib/kernel-10.2.6/doc/html/logger.html"><code·class="inline">logger</code></a>.</p><p>The·callback·gets·a·map·<code·class="inline">Status</code>·describing·the·current·status
1270 and·shall·return·a·map·<code·class="inline">NewStatus</code>·with·the·same·keys,1270 and·shall·return·a·map·<code·class="inline">NewStatus</code>·with·the·same·keys,
1271 but·it·may·transform·some·values.</p><p>Two·possible·use·cases·for·this·callback·is·to·remove1271 but·it·may·transform·some·values.</p><p>Two·possible·use·cases·for·this·callback·is·to·remove
1272 sensitive·information·from·the·state·to·prevent·it·from·being·printed1272 sensitive·information·from·the·state·to·prevent·it·from·being·printed
1273 in·log·files,·or·to·compact·large·irrelevant·status·items1273 in·log·files,·or·to·compact·large·irrelevant·status·items
1274 that·would·only·clutter·the·logs.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">format_status</span><span·class="p"·data-group-id="1080865833-1">(</span><span·class="n">Status</span><span·class="p"·data-group-id="1080865833-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1274 that·would·only·clutter·the·logs.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">format_status</span><span·class="p"·data-group-id="3279406946-1">(</span><span·class="n">Status</span><span·class="p"·data-group-id="3279406946-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1275 ··</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="1080865833-2">(</span><span·class="w">1275 ··</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="3279406946-2">(</span><span·class="w">
1276 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="1080865833-3">(</span><span·class="ss">state</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-group-id="1080865833-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1276 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="3279406946-3">(</span><span·class="ss">state</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-group-id="3279406946-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1277 ············</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">remove</span><span·class="p"·data-group-id="1080865833-4">(</span><span·class="ss">private_key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1080865833-4">)</span><span·class="p">;</span><span·class="w">1277 ············</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">remove</span><span·class="p"·data-group-id="3279406946-4">(</span><span·class="ss">private_key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="3279406946-4">)</span><span·class="p">;</span><span·class="w">
1278 ·······</span><span·class="p"·data-group-id="1080865833-5">(</span><span·class="ss">message</span><span·class="p">,</span><span·class="p"·data-group-id="1080865833-6">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Pass</[·...·truncated·by·diffoscope;·len:·99,·SHA:·a9cb9fede57ee77fc0828b657652c9e6c2500c913adac0aa04502cc0b6cad039·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1278 ·······</span><span·class="p"·data-group-id="3279406946-5">(</span><span·class="ss">message</span><span·class="p">,</span><span·class="p"·data-group-id="3279406946-6">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Pass</[·...·truncated·by·diffoscope;·len:·99,·SHA:·4e51d9e582da72cc625ded6de2093a97356f97dc1e0801a356b6320e11d4bb98·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1279 ············</span><span·class="p"·data-group-id="1080865833-7">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">removed</span><span·class="p"·data-group-id="1080865833-7">}</span><span·class="p">;</span><span·class="w">1279 ············</span><span·class="p"·data-group-id="3279406946-7">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">removed</span><span·class="p"·data-group-id="3279406946-7">}</span><span·class="p">;</span><span·class="w">
1280 ·······</span><span·class="p"·data-group-id="1080865833-8">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="1080865833-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1280 ·······</span><span·class="p"·data-group-id="3279406946-8">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="3279406946-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1281 ············</span><span·class="n">Value</span><span·class="w">1281 ············</span><span·class="n">Value</span><span·class="w">
1282 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Status</span><span·class="p"·data-group-id="1080865833-2">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·callback·is·optional,·so·event·handler·modules·need·not·export·it.1282 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Status</span><span·class="p"·data-group-id="3279406946-2">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·callback·is·optional,·so·event·handler·modules·need·not·export·it.
1283 If·a·handler·does·not·export·this·function,·the·<code·class="inline">gen_event</code>·module1283 If·a·handler·does·not·export·this·function,·the·<code·class="inline">gen_event</code>·module
1284 uses·the·handler·state·directly·for·the·purposes·described·below.</p><p>If·this·callback·is·exported·but·fails,·to·hide·possibly·sensitive·data,1284 uses·the·handler·state·directly·for·the·purposes·described·below.</p><p>If·this·callback·is·exported·but·fails,·to·hide·possibly·sensitive·data,
1285 the·default·function·will·instead·return·the·fact·that1285 the·default·function·will·instead·return·the·fact·that
1286 <a·href="#c:format_status/1"><code·class="inline">format_status/1</code></a>·has·crashed.</p></section>1286 <a·href="#c:format_status/1"><code·class="inline">format_status/1</code></a>·has·crashed.</p></section>
1287 ··</section>1287 ··</section>
1288 </section>1288 </section>
1289 <section·class="detail"·id="c:format_status/2">1289 <section·class="detail"·id="c:format_status/2">
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2878 ······<p·class="built-using">2878 ······<p·class="built-using">
2879 ········Built·using2879 ········Built·using
2880 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2880 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2881 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2881 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2882 ······</p>2882 ······</p>
2883 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2883 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2884 ····</footer>2884 ····</footer>
2885 ··</div>2885 ··</div>
2886 </main>2886 </main>
2887 </div>2887 </div>
2888 <script>2888 <script>
2889 ··function·mermaidLoaded()·{2889 ··function·mermaidLoaded()·{
2890 ····mermaid.initialize({2890 ····mermaid.initialize({
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131 <p>Deprecated·and·replaced·by·<a·href="gen_statem.html"><code·class="inline">gen_statem</code></a>·in·OTP·20.</p><h2·id="module-migration-to-gen_statem"·class="section-heading">131 <p>Deprecated·and·replaced·by·<a·href="gen_statem.html"><code·class="inline">gen_statem</code></a>·in·OTP·20.</p><h2·id="module-migration-to-gen_statem"·class="section-heading">
132 ··<a·href="#module-migration-to-gen_statem"·class="hover-link">132 ··<a·href="#module-migration-to-gen_statem"·class="hover-link">
133 ····<i·class="ri-link-m"·aria-hidden="true"></i>133 ····<i·class="ri-link-m"·aria-hidden="true"></i>
134 ··</a>134 ··</a>
135 ··<span·class="text">Migration·to·gen_statem</span>135 ··<span·class="text">Migration·to·gen_statem</span>
136 </h2>136 </h2>
137 <p>Here·follows·a·simple·example·of·turning·a·gen_fsm·into·a·<a·href="gen_statem.html"><code·class="inline">gen_statem</code></a>.137 <p>Here·follows·a·simple·example·of·turning·a·gen_fsm·into·a·<a·href="gen_statem.html"><code·class="inline">gen_statem</code></a>.
138 The·example·comes·from·the·previous·User's·Guide·for·<code·class="inline">gen_fsm</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0544214265-1">(</span><span·class="ss">code_lock</span><span·class="p"·data-group-id="0544214265-1">)</span><span·class="p">.</span><span·class="w">138 The·example·comes·from·the·previous·User's·Guide·for·<code·class="inline">gen_fsm</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4528119400-1">(</span><span·class="ss">code_lock</span><span·class="p"·data-group-id="4528119400-1">)</span><span·class="p">.</span><span·class="w">
139 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="0544214265-2">(</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_lock</span><span·class="p"·data-group-id="0544214265-2">)</span><span·class="p">.</span><span·class="w">139 </span><span·class="p">-</span><span·class="na">define</span><span·class="p"·data-group-id="4528119400-2">(</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_lock</span><span·class="p"·data-group-id="4528119400-2">)</span><span·class="p">.</span><span·class="w">
140 </span><span·class="c1">%-define(BEFORE_REWRITE,·true).</span><span·class="w">140 </span><span·class="c1">%-define(BEFORE_REWRITE,·true).</span><span·class="w">
141 </span><span·class="w">141 </span><span·class="w">
142 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-3">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-3">)</span><span·class="p">.</span><span·class="w">142 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-3">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-3">)</span><span·class="p">.</span><span·class="w">
143 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="0544214265-4">(</span><span·class="ss">gen_fsm</span><span·class="p"·data-group-id="0544214265-4">)</span><span·class="p">.</span><span·class="w">143 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="4528119400-4">(</span><span·class="ss">gen_fsm</span><span·class="p"·data-group-id="4528119400-4">)</span><span·class="p">.</span><span·class="w">
144 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">144 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
145 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="0544214265-5">(</span><span·class="ss">gen_statem</span><span·class="p"·data-group-id="0544214265-5">)</span><span·class="p">.</span><span·class="w">145 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="4528119400-5">(</span><span·class="ss">gen_statem</span><span·class="p"·data-group-id="4528119400-5">)</span><span·class="p">.</span><span·class="w">
146 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">146 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
147 </span><span·class="w">147 </span><span·class="w">
148 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0544214265-6">(</span><span·class="p"·data-group-id="0544214265-7">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">button</span><span·class="p">/</s[·...·truncated·by·diffoscope;·len:·248,·SHA:·ce398f7be3c86a5775bc0d429318b0d0cb1729bca7270530758ec0d7ba286989·...·]-6">)</span><span·class="p">.</span><span·class="w">148 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4528119400-6">(</span><span·class="p"·data-group-id="4528119400-7">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">button</span><span·class="p">/</s[·...·truncated·by·diffoscope;·len:·248,·SHA:·4b61b91946f04342fbaae1c25ed2280040f939b30361be13aeaf4e641d1c3169·...·]-6">)</span><span·class="p">.</span><span·class="w">
149 </span><span·class="w">149 </span><span·class="w">
150 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-8">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-8">)</span><span·class="p">.</span><span·class="w">150 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-8">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-8">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0544214265-9">(</span><span·class="p"·data-group-id="0544214265-10">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">open</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_sync_event</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">151 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4528119400-9">(</span><span·class="p"·data-group-id="4528119400-10">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">open</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_sync_event</span><span·class="p">/</span><span·class="mi">4</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">
152 ·····</span><span·class="ss">handle_info</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="0544214265-10">]</span><span·class="p"·data-group-id="0544214265-9">)</span><span·class="p">.</span><span·class="w">152 ·····</span><span·class="ss">handle_info</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="4528119400-10">]</span><span·class="p"·data-group-id="4528119400-9">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">153 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
154 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0544214265-11">(</span><span·class="p"·data-group-id="0544214265-12">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">callback_mode</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">open</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">154 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4528119400-11">(</span><span·class="p"·data-group-id="4528119400-12">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">callback_mode</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">open</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">
155 ·····</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="0544214265-12">]</span><span·class="p"·data-group-id="0544214265-11">)</span><span·class="p">.</span><span·class="w">155 ·····</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">4</span><span·class="p"·data-group-id="4528119400-12">]</span><span·class="p"·data-group-id="4528119400-11">)</span><span·class="p">.</span><span·class="w">
156 </span><span·class="c1">%%·Add·callback__mode/0</span><span·class="w">156 </span><span·class="c1">%%·Add·callback__mode/0</span><span·class="w">
157 </span><span·class="c1">%%·Change·arity·of·the·state·functions</span><span·class="w">157 </span><span·class="c1">%%·Change·arity·of·the·state·functions</span><span·class="w">
158 </span><span·class="c1">%%·Remove·handle_info/3</span><span·class="w">158 </span><span·class="c1">%%·Remove·handle_info/3</span><span·class="w">
159 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">159 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
160 </span><span·class="w">160 </span><span·class="w">
161 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-13">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-13">)</span><span·class="p">.</span><span·class="w">161 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-13">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-13">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="0544214265-14">(</span><span·class="n">Code</span><span·class="p"·data-group-id="0544214265-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">162 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="4528119400-14">(</span><span·class="n">Code</span><span·class="p"·data-group-id="4528119400-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
163 ····</span><span·class="nc">gen_fsm</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="0544214265-15">(</span><span·class="p"·data-group-id="0544214265-16">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p"·data-group-id="0544214265-16">}</sp[·...·truncated·by·diffoscope;·len:·376,·SHA:·482bf1b5b8db125365d8d88b1ae4e7c7d00e316edf8482bd7cf14196af61da81·...·]-15">)</span><span·class="p">.</span><span·class="w">163 ····</span><span·class="nc">gen_fsm</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="4528119400-15">(</span><span·class="p"·data-group-id="4528119400-16">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="w">·</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p"·data-group-id="4528119400-16">}</sp[·...·truncated·by·diffoscope;·len:·376,·SHA:·79dff8e9c167f5a64b500428bc46f58ae68635dc20683632baeb0de530c5c9af·...·]-15">)</span><span·class="p">.</span><span·class="w">
164 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">164 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
165 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="0544214265-18">(</span><span·class="n">Code</span><span·class="p"·data-group-id="0544214265-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">165 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="4528119400-18">(</span><span·class="n">Code</span><span·class="p"·data-group-id="4528119400-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
166 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="0544214265-19">(</span><span·class="p"·data-group-id="0544214265-20">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p"·data-group-id="0544214265-20">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·352,·SHA:·b18f2fb829e83d4436d8719165b0c793cd36523f0e3a7e64655feec1a2bea0c1·...·]-19">)</span><span·class="p">.</span><span·class="w">166 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="4528119400-19">(</span><span·class="p"·data-group-id="4528119400-20">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p"·data-group-id="4528119400-20">}</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·352,·SHA:·e4c162dc0e710b576e3757d8fc3ba4ad0b3f9fbc28558e3de522fce605866566·...·]-19">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">167 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
168 </span><span·class="w">168 </span><span·class="w">
169 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-22">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-22">)</span><span·class="p">.</span><span·class="w">169 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-22">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-22">)</span><span·class="p">.</span><span·class="w">
170 </span><span·class="nf">button</span><span·class="p"·data-group-id="0544214265-23">(</span><span·class="n">Digit</span><span·class="p"·data-group-id="0544214265-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">170 </span><span·class="nf">button</span><span·class="p"·data-group-id="4528119400-23">(</span><span·class="n">Digit</span><span·class="p"·data-group-id="4528119400-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
171 ····</span><span·class="nc">gen_fsm</span><span·class="p">:</span><span·class="nf">send_event</span><span·class="p"·data-group-id="0544214265-24">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0544214265-25">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·121,·SHA:·f38ae64d18dc2e4c2510264784df441be3fe4bd658428224d6c8259cd993b2cc·...·]-24">)</span><span·class="p">.</span><span·class="w">171 ····</span><span·class="nc">gen_fsm</span><span·class="p">:</span><span·class="nf">send_event</span><span·class="p"·data-group-id="4528119400-24">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4528119400-25">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·121,·SHA:·461cb2ea77f47c682f3aedbf39e044338a3660422232ce39091d597b966459d1·...·]-24">)</span><span·class="p">.</span><span·class="w">
172 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">172 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
173 </span><span·class="nf">button</span><span·class="p"·data-group-id="0544214265-26">(</span><span·class="n">Digit</span><span·class="p"·data-group-id="0544214265-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="nf">button</span><span·class="p"·data-group-id="4528119400-26">(</span><span·class="n">Digit</span><span·class="p"·data-group-id="4528119400-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="0544214265-27">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0544214265-28">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="n">Digit</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·0e93dadb6d5584dcb5e535089c0f0df151db9f39c2a078e160cd7bb3b1af0795·...·]-27">)</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">cast</span><span·class="p"·data-group-id="4528119400-27">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4528119400-28">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="n">Digit</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·cf7c00a6b97390805919b393c6cb836d42ed5f7b0d45ee7039025f94c2ee5e61·...·]-27">)</span><span·class="p">.</span><span·class="w">
175 ····</span><span·class="c1">%%·send_event·is·asynchronous·and·becomes·a·cast</span><span·class="w">175 ····</span><span·class="c1">%%·send_event·is·asynchronous·and·becomes·a·cast</span><span·class="w">
176 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">176 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
177 </span><span·class="w">177 </span><span·class="w">
178 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-29">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-29">)</span><span·class="p">.</span><span·class="w">178 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-29">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-29">)</span><span·class="p">.</span><span·class="w">
179 </span><span·class="nf">stop</span><span·class="p"·data-group-id="0544214265-30">(</span><span·class="p"·data-group-id="0544214265-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">179 </span><span·class="nf">stop</span><span·class="p"·data-group-id="4528119400-30">(</span><span·class="p"·data-group-id="4528119400-30">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
180 ····</span><span·class="nc">gen_fsm</span><span·class="p">:</span><span·class="nf">sync_send_all_state_event</span><span·class="p"·data-group-id="0544214265-31">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="0544214265-31">)</span><span·class="p">.</span><span·class="w">180 ····</span><span·class="nc">gen_fsm</span><span·class="p">:</span><span·class="nf">sync_send_all_state_event</span><span·class="p"·data-group-id="4528119400-31">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="4528119400-31">)</span><span·class="p">.</span><span·class="w">
181 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">181 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
182 </span><span·class="nf">stop</span><span·class="p"·data-group-id="0544214265-32">(</span><span·class="p"·data-group-id="0544214265-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 </span><span·class="nf">stop</span><span·class="p"·data-group-id="4528119400-32">(</span><span·class="p"·data-group-id="4528119400-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="0544214265-33">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="0544214265-33">)</span><span·class="p">.</span><span·class="w">183 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="4528119400-33">(</span><span·class="o">?</span><span·class="n">NAME</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="4528119400-33">)</span><span·class="p">.</span><span·class="w">
184 ····</span><span·class="c1">%%·sync_send·is·synchronous·and·becomes·call</span><span·class="w">184 ····</span><span·class="c1">%%·sync_send·is·synchronous·and·becomes·call</span><span·class="w">
185 ····</span><span·class="c1">%%·all_state·is·handled·by·callback·code·in·gen_statem</span><span·class="w">185 ····</span><span·class="c1">%%·all_state·is·handled·by·callback·code·in·gen_statem</span><span·class="w">
186 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">186 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
  
187 </span><span·class="nf">init</span><span·class="p"·data-group-id="0544214265-34">(</span><span·class="n">Code</span><span·class="p"·data-group-id="0544214265-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">187 </span><span·class="nf">init</span><span·class="p"·data-group-id="4528119400-34">(</span><span·class="n">Code</span><span·class="p"·data-group-id="4528119400-34">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
188 ····</span><span·class="nf">do_lock</span><span·class="p"·data-group-id="0544214265-35">(</span><span·class="p"·data-group-id="0544214265-35">)</span><span·class="p">,</span><span·class="w">188 ····</span><span·class="nf">do_lock</span><span·class="p"·data-group-id="4528119400-35">(</span><span·class="p"·data-group-id="4528119400-35">)</span><span·class="p">,</span><span·class="w">
189 ····</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0544214265-36">#{</span><span·class="ss">code</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Code</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">remaining</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·124,·SHA:·94f85e41b982525870715b99fda0102b25e7ffdf2f72daaf69bc416f79a3d165·...·]-36">}</span><span·class="p">,</span><span·class="w">189 ····</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4528119400-36">#{</span><span·class="ss">code</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="n">Code</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">remaining</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·124,·SHA:·e52a6fbc5affaba977b2eabf02d36b6683f9d9704866f68532206de22d757246·...·]-36">}</span><span·class="p">,</span><span·class="w">
190 ····</span><span·class="p"·data-group-id="0544214265-37">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-37">}</span><span·class="p">.</span><span·class="w">190 ····</span><span·class="p"·data-group-id="4528119400-37">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-37">}</span><span·class="p">.</span><span·class="w">
191 </span><span·class="w">191 </span><span·class="w">
192 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-38">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-38">)</span><span·class="p">.</span><span·class="w">192 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-38">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-38">)</span><span·class="p">.</span><span·class="w">
193 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">193 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
194 </span><span·class="nf">callback_mode</span><span·class="p"·data-group-id="0544214265-39">(</span><span·class="p"·data-group-id="0544214265-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 </span><span·class="nf">callback_mode</span><span·class="p"·data-group-id="4528119400-39">(</span><span·class="p"·data-group-id="4528119400-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ····</span><span·class="ss">state_functions</span><span·class="p">.</span><span·class="w">195 ····</span><span·class="ss">state_functions</span><span·class="p">.</span><span·class="w">
196 </span><span·class="c1">%%·state_functions·mode·is·the·mode·most·similar·to</span><span·class="w">196 </span><span·class="c1">%%·state_functions·mode·is·the·mode·most·similar·to</span><span·class="w">
197 </span><span·class="c1">%%·gen_fsm.·There·is·also·handle_event·mode·which·is</span><span·class="w">197 </span><span·class="c1">%%·gen_fsm.·There·is·also·handle_event·mode·which·is</span><span·class="w">
198 </span><span·class="c1">%%·a·fairly·different·concept.</span><span·class="w">198 </span><span·class="c1">%%·a·fairly·different·concept.</span><span·class="w">
199 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">199 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
200 </span><span·class="w">200 </span><span·class="w">
201 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-40">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-40">)</span><span·class="p">.</span><span·class="w">201 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-40">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-40">)</span><span·class="p">.</span><span·class="w">
202 </span><span·class="nf">locked</span><span·class="p"·data-group-id="0544214265-41">(</span><span·class="p"·data-group-id="0544214265-42">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Digit</span><span·class="p"·data-group-id="0544214265-42">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·98,·SHA:·80791d011509fb1fd38aa1f539406cd81fe005741daa2edf820ed037ec1483b8·...·]-41">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">202 </span><span·class="nf">locked</span><span·class="p"·data-group-id="4528119400-41">(</span><span·class="p"·data-group-id="4528119400-42">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Digit</span><span·class="p"·data-group-id="4528119400-42">}</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·98,·SHA:·2977cd22dee71f81716100dc98bfe20f1a140438bab4d578bc2d2225dcfef40b·...·]-41">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
203 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">analyze_lock</span><span·class="p"·data-group-id="0544214265-43">(</span><span·class="n">Digit</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data0</span><span·class="p"·data-group-id="0544214265-43">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">203 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">analyze_lock</span><span·class="p"·data-group-id="4528119400-43">(</span><span·class="n">Digit</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data0</span><span·class="p"·data-group-id="4528119400-43">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
204 ····</span><span·class="p"·data-group-id="0544214265-44">{</span><span·class="ss">open</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·273cbc5032c858722c7201b0e6d750c21c5f10d3a3a3f77e14a3a8e5b43ae05a·...·]-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">204 ····</span><span·class="p"·data-group-id="4528119400-44">{</span><span·class="ss">open</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·b11bbf42d8eb157e2706638b266ffafe497079271d3b6d109c6e645c01d16bc5·...·]-44">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
205 ········</span><span·class="p"·data-group-id="0544214265-45">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·74,·SHA:·cc6c325317c727c95ebd91032798ac3edf269a86c65ff6949f8b37e047ec7c17·...·]-45">}</span><span·class="p">;</span><span·class="w">205 ········</span><span·class="p"·data-group-id="4528119400-45">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·74,·SHA:·933af989579030f4f5e598c78d0caa0ed5c1a4753507249bb57b56ddf36eb122·...·]-45">}</span><span·class="p">;</span><span·class="w">
206 ····</span><span·class="p"·data-group-id="0544214265-46">{</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-46">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">206 ····</span><span·class="p"·data-group-id="4528119400-46">{</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-46">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
207 ········</span><span·class="p"·data-group-id="0544214265-47">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-47">}</span><span·class="w">207 ········</span><span·class="p"·data-group-id="4528119400-47">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-47">}</span><span·class="w">
208 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">208 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
209 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">209 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
210 </span><span·class="nf">locked</span><span·class="p"·data-group-id="0544214265-48">(</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0544214265-49">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="n">Digit</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·150,·SHA:·c20826b6485ed390cbb40aee40bd0842a9c110dea95d86c08d15fa0970ee0df5·...·]-48">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">210 </span><span·class="nf">locked</span><span·class="p"·data-group-id="4528119400-48">(</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4528119400-49">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="n">Digit</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·150,·SHA:·24b78d965b7d543b165f064ef7e06114eca361cbb7b4290cee0a4ca5d8b7fefd·...·]-48">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
211 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">analyze_lock</span><span·class="p"·data-group-id="0544214265-50">(</span><span·class="n">Digit</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data0</span><span·class="p"·data-group-id="0544214265-50">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">211 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">analyze_lock</span><span·class="p"·data-group-id="4528119400-50">(</span><span·class="n">Digit</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data0</span><span·class="p"·data-group-id="4528119400-50">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
212 ····</span><span·class="p"·data-group-id="0544214265-51">{</span><span·class="ss">open</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·273cbc5032c858722c7201b0e6d750c21c5f10d3a3a3f77e14a3a8e5b43ae05a·...·]-51">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">212 ····</span><span·class="p"·data-group-id="4528119400-51">{</span><span·class="ss">open</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·b11bbf42d8eb157e2706638b266ffafe497079271d3b6d109c6e645c01d16bc5·...·]-51">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
213 ········</span><span·class="p"·data-group-id="0544214265-52">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·74,·SHA:·cc6c325317c727c95ebd91032798ac3edf269a86c65ff6949f8b37e047ec7c17·...·]-52">}</span><span·class="p">;</span><span·class="w">213 ········</span><span·class="p"·data-group-id="4528119400-52">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·74,·SHA:·933af989579030f4f5e598c78d0caa0ed5c1a4753507249bb57b56ddf36eb122·...·]-52">}</span><span·class="p">;</span><span·class="w">
214 ····</span><span·class="p"·data-group-id="0544214265-53">{</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-53">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 ····</span><span·class="p"·data-group-id="4528119400-53">{</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-53">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ········</span><span·class="p"·data-group-id="0544214265-54">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-54">}</span><span·class="w">215 ········</span><span·class="p"·data-group-id="4528119400-54">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-54">}</span><span·class="w">
216 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">216 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
217 </span><span·class="nf">locked</span><span·class="p"·data-group-id="0544214265-55">(</span><span·class="p"·data-group-id="0544214265-56">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="0544214265-56">}</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·168,·SHA:·e08fcd4f47aa1fc768c73ea09ae808ccbddf12bf0600974fe40855af8b761d54·...·]-55">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">217 </span><span·class="nf">locked</span><span·class="p"·data-group-id="4528119400-55">(</span><span·class="p"·data-group-id="4528119400-56">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="4528119400-56">}</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·168,·SHA:·046d1dbc467e3eb9f668af007dce77a24a0089402d45adb77163a88afcf305ef·...·]-55">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
218 ····</span><span·class="nf">handle_call</span><span·class="p"·data-group-id="0544214265-57">(</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-57">)</span><span·class="p">;</span><span·class="w">218 ····</span><span·class="nf">handle_call</span><span·class="p"·data-group-id="4528119400-57">(</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-57">)</span><span·class="p">;</span><span·class="w">
219 </span><span·class="nf">locked</span><span·class="p"·data-group-id="0544214265-58">(</span><span·class="p"·data-group-id="0544214265-59">{</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="0544214265-59">}</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·173,·SHA:·80eb64994215bda8f6ddc490e9e50e9b998ea6eec8de173a299c1c6a95b9423a·...·]-58">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">219 </span><span·class="nf">locked</span><span·class="p"·data-group-id="4528119400-58">(</span><span·class="p"·data-group-id="4528119400-59">{</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="4528119400-59">}</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·173,·SHA:·87cfde6d804e3a2027dd7854b4cef4e008cf4fb7ec835bc308bf16c8f7640d97·...·]-58">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
220 ····</span><span·class="nf">handle_info</span><span·class="p"·data-group-id="0544214265-60">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-60">)</span><span·class="p">.</span><span·class="w">220 ····</span><span·class="nf">handle_info</span><span·class="p"·data-group-id="4528119400-60">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-60">)</span><span·class="p">.</span><span·class="w">
221 </span><span·class="c1">%%·Arity·differs</span><span·class="w">221 </span><span·class="c1">%%·Arity·differs</span><span·class="w">
222 </span><span·class="c1">%%·All·state·events·are·dispatched·to·handle_call·and·handle_info·help</span><span·class="w">222 </span><span·class="c1">%%·All·state·events·are·dispatched·to·handle_call·and·handle_info·help</span><span·class="w">
223 </span><span·class="c1">%%·functions.·If·you·want·to·handle·a·call·or·cast·event·specifically</span><span·class="w">223 </span><span·class="c1">%%·functions.·If·you·want·to·handle·a·call·or·cast·event·specifically</span><span·class="w">
224 </span><span·class="c1">%%·for·this·state·you·would·add·a·special·clause·for·it·above.</span><span·class="w">224 </span><span·class="c1">%%·for·this·state·you·would·add·a·special·clause·for·it·above.</span><span·class="w">
225 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">225 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
226 </span><span·class="w">226 </span><span·class="w">
227 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-61">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-61">)</span><span·class="p">.</span><span·class="w">227 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-61">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-61">)</span><span·class="p">.</span><span·class="w">
228 </span><span·class="nf">open</span><span·class="p"·data-group-id="0544214265-62">(</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="0544214265-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">228 </span><span·class="nf">open</span><span·class="p"·data-group-id="4528119400-62">(</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4528119400-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
229 ·····</span><span·class="nf">do_lock</span><span·class="p"·data-group-id="0544214265-63">(</span><span·class="p"·data-group-id="0544214265-63">)</span><span·class="p">,</span><span·class="w">229 ·····</span><span·class="nf">do_lock</span><span·class="p"·data-group-id="4528119400-63">(</span><span·class="p"·data-group-id="4528119400-63">)</span><span·class="p">,</span><span·class="w">
230 ····</span><span·class="p"·data-group-id="0544214265-64">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="0544214265-64">}</span><span·class="p">;</span><span·class="w">230 ····</span><span·class="p"·data-group-id="4528119400-64">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4528119400-64">}</span><span·class="p">;</span><span·class="w">
231 </span><span·class="nf">open</span><span·class="p"·data-group-id="0544214265-65">(</span><span·class="p"·data-group-id="0544214265-66">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="0544214265-66">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·69,·SHA:·3fc18ca091e1add8d730a0a85f0f28e6cfe3b22253600f9ee364a552cd0b9e1a·...·]-65">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 </span><span·class="nf">open</span><span·class="p"·data-group-id="4528119400-65">(</span><span·class="p"·data-group-id="4528119400-66">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="4528119400-66">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·69,·SHA:·07be3a2250b9105dfc26e9300fd921ed4da462859bacfcebc4ca44c60d7e67ad·...·]-65">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ····</span><span·class="p"·data-group-id="0544214265-67">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-67">}</span><span·class="p">.</span><span·class="w">232 ····</span><span·class="p"·data-group-id="4528119400-67">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-67">}</span><span·class="p">.</span><span·class="w">
233 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">233 </span><span·class="p">-</span><span·class="na">else</span><span·class="p">.</span><span·class="w">
234 </span><span·class="nf">open</span><span·class="p"·data-group-id="0544214265-68">(</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-68">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">234 </span><span·class="nf">open</span><span·class="p"·data-group-id="4528119400-68">(</span><span·class="ss">timeout</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-68">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
235 ····</span><span·class="nf">do_lock</span><span·class="p"·data-group-id="0544214265-69">(</span><span·class="p"·data-group-id="0544214265-69">)</span><span·class="p">,</span><span·class="w">235 ····</span><span·class="nf">do_lock</span><span·class="p"·data-group-id="4528119400-69">(</span><span·class="p"·data-group-id="4528119400-69">)</span><span·class="p">,</span><span·class="w">
236 ····</span><span·class="p"·data-group-id="0544214265-70">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-70">}</span><span·class="p">;</span><span·class="w">236 ····</span><span·class="p"·data-group-id="4528119400-70">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-70">}</span><span·class="p">;</span><span·class="w">
237 </span><span·class="nf">open</span><span·class="p"·data-group-id="0544214265-71">(</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0544214265-72">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·145,·SHA:·d043a62e621dd6e1cab1c72a200974b7134185845083088049a4a3cdeadf65c1·...·]-71">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">237 </span><span·class="nf">open</span><span·class="p"·data-group-id="4528119400-71">(</span><span·class="ss">cast</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4528119400-72">{</span><span·class="ss">button</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·145,·SHA:·2087c500370c875fc9697b625b5baefdd6a3232132e375c0d3bc226cb1acc16a·...·]-71">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
238 ····</span><span·class="p"·data-group-id="0544214265-73">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-73">}</span><span·class="p">;</span><span·class="w">238 ····</span><span·class="p"·data-group-id="4528119400-73">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">locked</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-73">}</span><span·class="p">;</span><span·class="w">
239 </span><span·class="nf">open</span><span·class="p"·data-group-id="0544214265-74">(</span><span·class="p"·data-group-id="0544214265-75">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="0544214265-75">}</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·168,·SHA:·e08fcd4f47aa1fc768c73ea09ae808ccbddf12bf0600974fe40855af8b761d54·...·]-74">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">239 </span><span·class="nf">open</span><span·class="p"·data-group-id="4528119400-74">(</span><span·class="p"·data-group-id="4528119400-75">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="4528119400-75">}</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·168,·SHA:·046d1dbc467e3eb9f668af007dce77a24a0089402d45adb77163a88afcf305ef·...·]-74">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
240 ····</span><span·class="nf">handle_call</span><span·class="p"·data-group-id="0544214265-76">(</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-76">)</span><span·class="p">;</span><span·class="w">240 ····</span><span·class="nf">handle_call</span><span·class="p"·data-group-id="4528119400-76">(</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-76">)</span><span·class="p">;</span><span·class="w">
241 </span><span·class="nf">open</span><span·class="p"·data-group-id="0544214265-77">(</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-77">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">241 </span><span·class="nf">open</span><span·class="p"·data-group-id="4528119400-77">(</span><span·class="ss">info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-77">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
242 ····</span><span·class="nf">handle_info</span><span·class="p"·data-group-id="0544214265-78">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">open</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-78">)</span><span·class="p">.</span><span·class="w">242 ····</span><span·class="nf">handle_info</span><span·class="p"·data-group-id="4528119400-78">(</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">open</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-78">)</span><span·class="p">.</span><span·class="w">
243 </span><span·class="c1">%%·Arity·differs</span><span·class="w">243 </span><span·class="c1">%%·Arity·differs</span><span·class="w">
244 </span><span·class="c1">%%·All·state·events·are·dispatched·to·handle_call·and·handle_info·help</span><span·class="w">244 </span><span·class="c1">%%·All·state·events·are·dispatched·to·handle_call·and·handle_info·help</span><span·class="w">
245 </span><span·class="c1">%%·functions.·If·you·want·to·handle·a·call·or·cast·event·specifically</span><span·class="w">245 </span><span·class="c1">%%·functions.·If·you·want·to·handle·a·call·or·cast·event·specifically</span><span·class="w">
246 </span><span·class="c1">%%·for·this·state·you·would·add·a·special·clause·for·it·above.</span><span·class="w">246 </span><span·class="c1">%%·for·this·state·you·would·add·a·special·clause·for·it·above.</span><span·class="w">
247 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">247 </span><span·class="p">-</span><span·class="na">endif</span><span·class="p">.</span><span·class="w">
248 </span><span·class="w">248 </span><span·class="w">
249 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="0544214265-79">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="0544214265-79">)</span><span·class="p">.</span><span·class="w">249 </span><span·class="p">-</span><span·class="na">ifdef</span><span·class="p"·data-group-id="4528119400-79">(</span><span·class="n">BEFORE_REWRITE</span><span·class="p"·data-group-id="4528119400-79">)</span><span·class="p">.</span><span·class="w">
250 </span><span·class="nf">handle_sync_event</span><span·class="p"·data-group-id="0544214265-80">(</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">StateName</span><s[·...·truncated·by·diffoscope;·len:·114,·SHA:·9a12a9fcd2c5ebbd69bd7c8c3b46696ee9f3f2216f0ea202f09451bec648b04e·...·]-80">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">250 </span><span·class="nf">handle_sync_event</span><span·class="p"·data-group-id="4528119400-80">(</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">StateName</span><s[·...·truncated·by·diffoscope;·len:·114,·SHA:·b2892d35981c70a5360c29f60c56b05339a82259c7b5b405280c829fa0b7f6e9·...·]-80">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
251 ····</span><span·class="p"·data-group-id="0544214265-81">{</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·63,·SHA:·c9f16941c54ee6fd59c93d311dad60c3a98d7a073e3474a92ad0684039bf11bc·...·]-81">}</span><span·class="p">.</span><span·class="w">251 ····</span><span·class="p"·data-group-id="4528119400-81">{</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">normal</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·63,·SHA:·c6158cf79bedd5e99350383f004abec935b211c46a771e01b8ea7b18d4df2057·...·]-81">}</span><span·class="p">.</span><span·class="w">
  
252 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="0544214265-82">(</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-82">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">252 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="4528119400-82">(</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-82">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
253 ····</span><span·class="p"·data-group-id="0544214265-83">{</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0544214265-84">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·445,·SHA:·57d4a94fcdd1afc52bf90a789a1c64af2960d7a38c716e7a49c1597f539860ab·...·]-83">}</span><span·class="p">.</span><span·class="w">253 ····</span><span·class="p"·data-group-id="4528119400-83">{</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4528119400-84">{</span><span·class="ss">shutdown</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·445,·SHA:·18bfbe7bccacf898ad77d4721e903cbe17048b7e836803dc1fe0bdabc4377596·...·]-83">}</span><span·class="p">.</span><span·class="w">
  
254 </span><span·class="nf">handle_info</span><span·class="p"·data-group-id="0544214265-86">(</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="0544214265-86">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">254 </span><span·class="nf">handle_info</span><span·class="p"·data-group-id="4528119400-86">(</span><span·class="n">Info</span><span·class="p">,</span><span·class="w">·</span><span·class="n">StateName</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="4528119400-86">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
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Offset 1247, 23 lines modifiedOffset 1247, 23 lines modified
1247 format/limit·the·server·state·for·debugging·and·logging·purposes.</p><p>It·is·called·in·the·following·situations:</p><ul><li><a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·is·invoked1247 format/limit·the·server·state·for·debugging·and·logging·purposes.</p><p>It·is·called·in·the·following·situations:</p><ul><li><a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·is·invoked
1248 to·get·the·<code·class="inline">gen_server</code>·status.</li><li>The·<code·class="inline">gen_server</code>·process·terminates·abnormally·and·logs·an·error.</li></ul><p>This·callback·is·used·to·limit·the·status·of·the·process·returned·by1248 to·get·the·<code·class="inline">gen_server</code>·status.</li><li>The·<code·class="inline">gen_server</code>·process·terminates·abnormally·and·logs·an·error.</li></ul><p>This·callback·is·used·to·limit·the·status·of·the·process·returned·by
1249 <a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·or·sent·to·<a·href="../../../../lib/kernel-10.2.6/doc/html/logger.html"><code·class="inline">logger</code></a>.</p><p>The·callback·gets·a·map·<code·class="inline">Status</code>·describing·the·current·status1249 <a·href="sys.html#get_status/1"><code·class="inline">sys:get_status/1,2</code></a>·or·sent·to·<a·href="../../../../lib/kernel-10.2.6/doc/html/logger.html"><code·class="inline">logger</code></a>.</p><p>The·callback·gets·a·map·<code·class="inline">Status</code>·describing·the·current·status
1250 and·shall·return·a·map·<code·class="inline">NewStatus</code>·with·the·same·keys,1250 and·shall·return·a·map·<code·class="inline">NewStatus</code>·with·the·same·keys,
1251 but·it·may·transform·some·values.</p><p>Two·possible·use·cases·for·this·callback·is·to·remove1251 but·it·may·transform·some·values.</p><p>Two·possible·use·cases·for·this·callback·is·to·remove
1252 sensitive·information·from·the·state·to·prevent·it·from·being·printed1252 sensitive·information·from·the·state·to·prevent·it·from·being·printed
1253 in·log·files,·or·to·compact·large·irrelevant·status·items1253 in·log·files,·or·to·compact·large·irrelevant·status·items
1254 that·would·only·clutter·the·logs.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">format_status</span><span·class="p"·data-group-id="8958430949-1">(</span><span·class="n">Status</span><span·class="p"·data-group-id="8958430949-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1254 that·would·only·clutter·the·logs.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">format_status</span><span·class="p"·data-group-id="1307891452-1">(</span><span·class="n">Status</span><span·class="p"·data-group-id="1307891452-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1255 ··</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="8958430949-2">(</span><span·class="w">1255 ··</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="1307891452-2">(</span><span·class="w">
1256 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="8958430949-3">(</span><span·class="ss">state</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-group-id="8958430949-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1256 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="1307891452-3">(</span><span·class="ss">state</span><span·class="p">,</span><span·class="n">State</span><span·class="p"·data-group-id="1307891452-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1257 ············</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">remove</span><span·class="p"·data-group-id="8958430949-4">(</span><span·class="ss">private_key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="8958430949-4">)</span><span·class="p">;</span><span·class="w">1257 ············</span><span·class="nc">maps</span><span·class="p">:</span><span·class="nf">remove</span><span·class="p"·data-group-id="1307891452-4">(</span><span·class="ss">private_key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1307891452-4">)</span><span·class="p">;</span><span·class="w">
1258 ·······</span><span·class="p"·data-group-id="8958430949-5">(</span><span·class="ss">message</span><span·class="p">,</span><span·class="p"·data-group-id="8958430949-6">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Pass</[·...·truncated·by·diffoscope;·len:·99,·SHA:·f3718c75e421df381f1f0bdbf483d895dbdd4888fe1ea3585e4b7f46d6a6de89·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1258 ·······</span><span·class="p"·data-group-id="1307891452-5">(</span><span·class="ss">message</span><span·class="p">,</span><span·class="p"·data-group-id="1307891452-6">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Pass</[·...·truncated·by·diffoscope;·len:·99,·SHA:·4ded80c4896f28b94cc38d7eb26982bdc60cd63f03b58fe16e28fa37a715350d·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1259 ············</span><span·class="p"·data-group-id="8958430949-7">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">removed</span><span·class="p"·data-group-id="8958430949-7">}</span><span·class="p">;</span><span·class="w">1259 ············</span><span·class="p"·data-group-id="1307891452-7">{</span><span·class="ss">password</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">removed</span><span·class="p"·data-group-id="1307891452-7">}</span><span·class="p">;</span><span·class="w">
1260 ·······</span><span·class="p"·data-group-id="8958430949-8">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="8958430949-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1260 ·······</span><span·class="p"·data-group-id="1307891452-8">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="1307891452-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1261 ············</span><span·class="n">Value</span><span·class="w">1261 ············</span><span·class="n">Value</span><span·class="w">
1262 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Status</span><span·class="p"·data-group-id="8958430949-2">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·callback·is·optional,·so·callback·modules·need·not·export·it.·The1262 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Status</span><span·class="p"·data-group-id="1307891452-2">)</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>This·callback·is·optional,·so·callback·modules·need·not·export·it.·The
1263 <code·class="inline">gen_server</code>·module·provides·a·default·implementation1263 <code·class="inline">gen_server</code>·module·provides·a·default·implementation
1264 of·this·function·that·returns·the·callback·module·state.</p><p>If·this·callback·is·exported·but·fails,1264 of·this·function·that·returns·the·callback·module·state.</p><p>If·this·callback·is·exported·but·fails,
1265 to·hide·possibly·sensitive·data,1265 to·hide·possibly·sensitive·data,
1266 the·default·function·will·instead·return·the·fact·that1266 the·default·function·will·instead·return·the·fact·that
1267 <a·href="#c:format_status/1"><code·class="inline">Module:format_status/1</code></a>·has·crashed.</p></section>1267 <a·href="#c:format_status/1"><code·class="inline">Module:format_status/1</code></a>·has·crashed.</p></section>
1268 ··</section>1268 ··</section>
1269 </section>1269 </section>
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2898 ······<p·class="built-using">2898 ······<p·class="built-using">
2899 ········Built·using2899 ········Built·using
2900 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2900 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2901 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2901 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2902 ······</p>2902 ······</p>
2903 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2903 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2904 ····</footer>2904 ····</footer>
2905 ··</div>2905 ··</div>
2906 </main>2906 </main>
2907 </div>2907 </div>
2908 <script>2908 <script>
2909 ··function·mermaidLoaded()·{2909 ··function·mermaidLoaded()·{
2910 ····mermaid.initialize({2910 ····mermaid.initialize({
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172 </span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="ss">send_request</span><span·class="w">172 </span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="ss">send_request</span><span·class="w">
173 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">send</span><span·class="w">173 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">send</span><span·class="w">
174 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="ss">&#39;!&#39;</span><span·class="w">············</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">:</span><span·class="n">StateName</span><span·class="o">/</span><span·class="mi">3</span><span·class="w">174 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="ss">&#39;!&#39;</span><span·class="w">············</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">:</span><span·class="n">StateName</span><span·class="o">/</span><span·class="mi">3</span><span·class="w">
175 ···················</span><span·class="ow">or</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">:</span><span·class="ss">handle_event</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">175 ···················</span><span·class="ow">or</span><span·class="w">·</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">:</span><span·class="ss">handle_event</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">
176 ···················</span><span·class="ss">depending</span><span·class="w">·</span><span·class="ss">on</span><span·class="w">·</span><span·class="ss">callback</span><span·class="w">·</span><span·class="ss">mode</span><span·class="w">176 ···················</span><span·class="ss">depending</span><span·class="w">·</span><span·class="ss">on</span><span·class="w">·</span><span·class="ss">callback</span><span·class="w">·</span><span·class="ss">mode</span><span·class="w">
  
177 </span><span·class="n">Release</span><span·class="w">·</span><span·class="ss">upgrade</span><span·class="o">/</span><span·class="nf">downgrade</span><span·class="w">177 </span><span·class="n">Release</span><span·class="w">·</span><span·class="ss">upgrade</span><span·class="o">/</span><span·class="nf">downgrade</span><span·class="w">
178 </span><span·class="p"·data-group-id="0252855748-1">(</span><span·class="ss">code</span><span·class="w">·</span><span·class="ss">change</span><span·class="p"·data-group-id="0252855748-1">)</span><span·class="w">178 </span><span·class="p"·data-group-id="8352049134-1">(</span><span·class="ss">code</span><span·class="w">·</span><span·class="ss">change</span><span·class="p"·data-group-id="8352049134-1">)</span><span·class="w">
179 ······················</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">:</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">4</span></code></pre><h4·id="state-callback">State·callback</h4><p>The·<em>state·callback</em>·for·a·specific·<a·href="#t:state/0">state</a>·in·a·<code·class="inline">gen_statem</code>179 ······················</span><span·class="o">--</span><span·class="o">--</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Module</span><span·class="p">:</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">4</span></code></pre><h4·id="state-callback">State·callback</h4><p>The·<em>state·callback</em>·for·a·specific·<a·href="#t:state/0">state</a>·in·a·<code·class="inline">gen_statem</code>
180 is·the·callback·function·that·is·called·for·all·events·in·this·state.180 is·the·callback·function·that·is·called·for·all·events·in·this·state.
181 It·is·selected·depending·on·which·<a·href="#t:callback_mode/0"><em>callback·mode</em></a>181 It·is·selected·depending·on·which·<a·href="#t:callback_mode/0"><em>callback·mode</em></a>
182 that·the·callback·module·defines·with·the·callback·function182 that·the·callback·module·defines·with·the·callback·function
183 <a·href="#c:callback_mode/0"><code·class="inline">Module:callback_mode/0</code></a>.</p><p><a·href=""·id="state_functions"></a>183 <a·href="#c:callback_mode/0"><code·class="inline">Module:callback_mode/0</code></a>.</p><p><a·href=""·id="state_functions"></a>
184 When·the·<a·href="#t:callback_mode/0"><em>callback·mode</em></a>·is·<code·class="inline">state_functions</code>,184 When·the·<a·href="#t:callback_mode/0"><em>callback·mode</em></a>·is·<code·class="inline">state_functions</code>,
185 the·state·must·be·an·atom·and·is·used·as·the·<em>state·callback</em>·name;185 the·state·must·be·an·atom·and·is·used·as·the·<em>state·callback</em>·name;
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298 the·current·count·value.</li><li>Unknown·events·are·ignored·and·discarded.</li><li>There·is·boilerplate·code·for·start,·stop,·terminate,·code·change,298 the·current·count·value.</li><li>Unknown·events·are·ignored·and·discarded.</li><li>There·is·boilerplate·code·for·start,·stop,·terminate,·code·change,
299 init,·to·set·the·callback·mode·to·<code·class="inline">state_functions</code>,·etc...</li></ul><h3·id="module-pushbutton-code"·class="section-heading">299 init,·to·set·the·callback·mode·to·<code·class="inline">state_functions</code>,·etc...</li></ul><h3·id="module-pushbutton-code"·class="section-heading">
300 ··<a·href="#module-pushbutton-code"·class="hover-link">300 ··<a·href="#module-pushbutton-code"·class="hover-link">
301 ····<i·class="ri-link-m"·aria-hidden="true"></i>301 ····<i·class="ri-link-m"·aria-hidden="true"></i>
302 ··</a>302 ··</a>
303 ··<span·class="text">Pushbutton·Code</span>303 ··<span·class="text">Pushbutton·Code</span>
304 </h3>304 </h3>
305 <p>The·following·is·the·complete·callback·module·file·<code·class="inline">pushbutton.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2849157521-1">(</span><span·class="ss">pushbutton</span><span·class="p"·data-group-id="2849157521-1">)</span><span·class="p">.</span><span·class="w">305 <p>The·following·is·the·complete·callback·module·file·<code·class="inline">pushbutton.erl</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2983726247-1">(</span><span·class="ss">pushbutton</span><span·class="p"·data-group-id="2983726247-1">)</span><span·class="p">.</span><span·class="w">
306 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="2849157521-2">(</span><span·class="ss">gen_statem</span><span·class="p"·data-group-id="2849157521-2">)</span><span·class="p">.</span><span·class="w">306 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="2983726247-2">(</span><span·class="ss">gen_statem</span><span·class="p"·data-group-id="2983726247-2">)</span><span·class="p">.</span><span·class="w">
307 </span><span·class="w">307 </span><span·class="w">
308 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2849157521-3">(</span><span·class="p"·data-group-id="2849157521-4">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">push</span><span·class="p">/</span><span·class="mi">0</span><sp[·...·truncated·by·diffoscope;·len:·298,·SHA:·339117133755d632e67cd9cd3beaa641772f159157a06572f1956520e35c2894·...·]-3">)</span><span·class="p">.</span><span·class="w">308 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2983726247-3">(</span><span·class="p"·data-group-id="2983726247-4">[</span><span·class="ss">start</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">push</span><span·class="p">/</span><span·class="mi">0</span><sp[·...·truncated·by·diffoscope;·len:·298,·SHA:·b33efb23120d343b854609157d0e984bc65c625c472834b2aca55630ac198c03·...·]-3">)</span><span·class="p">.</span><span·class="w">
309 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2849157521-5">(</span><span·class="p"·data-group-id="2849157521-6">[</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·313,·SHA:·d19f0fa265bc37a161b1f25e5438239218414caf5c7aad17a0db68701272215c·...·]-5">)</span><span·class="p">.</span><span·class="w">309 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2983726247-5">(</span><span·class="p"·data-group-id="2983726247-6">[</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·313,·SHA:·bc800738a5042308f6efe27ef53c3b0ce0efcbff9770f5f271d4998e28946703·...·]-5">)</span><span·class="p">.</span><span·class="w">
310 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2849157521-7">(</span><span·class="p"·data-group-id="2849157521-8">[</span><span·class="ss">on</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">off</span><span·class="p">/</span><span·class="mi">3</span><span·c[·...·truncated·by·diffoscope;·len:·87,·SHA:·b26ea8a31575f34aeeb591dd0164575f1ed9e41c7644c08141815d7854306ba5·...·]-7">)</span><span·class="p">.</span><span·class="w">310 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2983726247-7">(</span><span·class="p"·data-group-id="2983726247-8">[</span><span·class="ss">on</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">off</span><span·class="p">/</span><span·class="mi">3</span><span·c[·...·truncated·by·diffoscope;·len:·87,·SHA:·7e5c9d2d4479c2b044271cfb4b32b288faaeeac6638887fbe32ac37604c61a73·...·]-7">)</span><span·class="p">.</span><span·class="w">
  
311 </span><span·class="nf">name</span><span·class="p"·data-group-id="2849157521-9">(</span><span·class="p"·data-group-id="2849157521-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">pushbutton_statem</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·The·registered·server·name</span><span·class="w">311 </span><span·class="nf">name</span><span·class="p"·data-group-id="2983726247-9">(</span><span·class="p"·data-group-id="2983726247-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">pushbutton_statem</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·The·registered·server·name</span><span·class="w">
  
312 </span><span·class="c1">%%·API.··This·example·uses·a·registered·name·name()</span><span·class="w">312 </span><span·class="c1">%%·API.··This·example·uses·a·registered·name·name()</span><span·class="w">
313 </span><span·class="c1">%%·and·does·not·link·to·the·caller.</span><span·class="w">313 </span><span·class="c1">%%·and·does·not·link·to·the·caller.</span><span·class="w">
314 </span><span·class="nf">start</span><span·class="p"·data-group-id="2849157521-10">(</span><span·class="p"·data-group-id="2849157521-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">314 </span><span·class="nf">start</span><span·class="p"·data-group-id="2983726247-10">(</span><span·class="p"·data-group-id="2983726247-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
315 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2849157521-11">(</span><span·class="p"·data-group-id="2849157521-12">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="nf">name</span><span·class="p"·data-group-id="2849157521-13">(</span><span·class="p"·data-group-id="2849157521-13"[·...·truncated·by·diffoscope;·len:·517,·SHA:·385efcd15054a32cf8f9285b39f8bae624fdb2c28592253e47db27e9d1be2c52·...·]-11">)</span><span·class="p">.</span><span·class="w">315 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2983726247-11">(</span><span·class="p"·data-group-id="2983726247-12">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="nf">name</span><span·class="p"·data-group-id="2983726247-13">(</span><span·class="p"·data-group-id="2983726247-13"[·...·truncated·by·diffoscope;·len:·517,·SHA:·391c2129174271dd388a87df9029ed72b4216076cc982c19aa8d6740d98e9836·...·]-11">)</span><span·class="p">.</span><span·class="w">
316 </span><span·class="nf">push</span><span·class="p"·data-group-id="2849157521-16">(</span><span·class="p"·data-group-id="2849157521-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">316 </span><span·class="nf">push</span><span·class="p"·data-group-id="2983726247-16">(</span><span·class="p"·data-group-id="2983726247-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
317 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="2849157521-17">(</span><span·class="nf">name</span><span·class="p"·data-group-id="2849157521-18">(</span><span·class="p"·data-group-id="2849157521-18">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">push</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·174b69e926d2767d127dbe7889357ebf7f2c738c5330c6a22ac7ad21ec21b66c·...·]-17">)</span><span·class="p">.</span><span·class="w">317 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="2983726247-17">(</span><span·class="nf">name</span><span·class="p"·data-group-id="2983726247-18">(</span><span·class="p"·data-group-id="2983726247-18">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">push</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·c7a52b9507b2ef0524fdfc1aad69ffae69ff6da7d3d6be43d44823beec87210a·...·]-17">)</span><span·class="p">.</span><span·class="w">
318 </span><span·class="nf">get_count</span><span·class="p"·data-group-id="2849157521-19">(</span><span·class="p"·data-group-id="2849157521-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">318 </span><span·class="nf">get_count</span><span·class="p"·data-group-id="2983726247-19">(</span><span·class="p"·data-group-id="2983726247-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
319 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="2849157521-20">(</span><span·class="nf">name</span><span·class="p"·data-group-id="2849157521-21">(</span><span·class="p"·data-group-id="2849157521-21">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">get_count</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·6ac8889048509b3698eb56a55ce094d6d7696f3b316cc1081dd49eae6a0a677c·...·]-20">)</span><span·class="p">.</span><span·class="w">319 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="2983726247-20">(</span><span·class="nf">name</span><span·class="p"·data-group-id="2983726247-21">(</span><span·class="p"·data-group-id="2983726247-21">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">get_count</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·32dca37345c95c763009c7982cbd7de016a94c4917c2d06eef70a5d82db9453d·...·]-20">)</span><span·class="p">.</span><span·class="w">
320 </span><span·class="nf">stop</span><span·class="p"·data-group-id="2849157521-22">(</span><span·class="p"·data-group-id="2849157521-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">320 </span><span·class="nf">stop</span><span·class="p"·data-group-id="2983726247-22">(</span><span·class="p"·data-group-id="2983726247-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
321 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="2849157521-23">(</span><span·class="nf">name</span><span·class="p"·data-group-id="2849157521-24">(</span><span·class="p"·data-group-id="2849157521-24">)</span><span·class="p"·data-group-id="2849157521-23">)</span><span·class="p">.</span><span·class="w">321 ····</span><span·class="nc">gen_statem</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="2983726247-23">(</span><span·class="nf">name</span><span·class="p"·data-group-id="2983726247-24">(</span><span·class="p"·data-group-id="2983726247-24">)</span><span·class="p"·data-group-id="2983726247-23">)</span><span·class="p">.</span><span·class="w">
  
322 </span><span·class="c1">%%·Mandatory·callback·functions</span><span·class="w">322 </span><span·class="c1">%%·Mandatory·callback·functions</span><span·class="w">
323 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="2849157521-25">(</span><span·class="p">_</span><span·class="n">Reason</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·cla[·...·truncated·by·diffoscope;·len:·59,·SHA:·940ab81c97ea0dd25d13a917b3a51d560f0aff47823a37ad29f85af436065837·...·]-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">323 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="2983726247-25">(</span><span·class="p">_</span><span·class="n">Reason</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·cla[·...·truncated·by·diffoscope;·len:·59,·SHA:·17630c9637c3f849eb9bd8e9dc6fbb5cf550fab041f6303182dbebeb45b703c8·...·]-25">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
324 ····</span><span·class="ss">void</span><span·class="p">.</span><span·class="w">324 ····</span><span·class="ss">void</span><span·class="p">.</span><span·class="w">
325 </span><span·class="nf">code_change</span><span·class="p"·data-group-id="2849157521-26">(</span><span·class="p">_</span><span·class="n">Vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·108,·SHA:·3e5458e874cc5e199ef3e1e79d10286342fe484bcff6a5e002ad67a1f60357b3·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">325 </span><span·class="nf">code_change</span><span·class="p"·data-group-id="2983726247-26">(</span><span·class="p">_</span><span·class="n">Vsn</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p">,</span><span·cla[·...·truncated·by·diffoscope;·len:·108,·SHA:·0277699f260267c7aeab0c8e1fd4893b209757059991d21c3409786a86e994dc·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
326 ····</span><span·class="p"·data-group-id="2849157521-27">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-27">}</span><span·class="p">.</span><span·class="w">326 ····</span><span·class="p"·data-group-id="2983726247-27">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-27">}</span><span·class="p">.</span><span·class="w">
327 </span><span·class="nf">init</span><span·class="p"·data-group-id="2849157521-28">(</span><span·class="p"·data-group-id="2849157521-29">[</span><span·class="p"·data-group-id="2849157521-29">]</span><span·class="p"·data-group-id="2849157521-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">327 </span><span·class="nf">init</span><span·class="p"·data-group-id="2983726247-28">(</span><span·class="p"·data-group-id="2983726247-29">[</span><span·class="p"·data-group-id="2983726247-29">]</span><span·class="p"·data-group-id="2983726247-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
328 ····</span><span·class="c1">%%·Set·the·initial·state·+·data.··Data·is·used·only·as·a·counter.</span><span·class="w">328 ····</span><span·class="c1">%%·Set·the·initial·state·+·data.··Data·is·used·only·as·a·counter.</span><span·class="w">
329 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">off</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">329 ····</span><span·class="n">State</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">off</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
330 ····</span><span·class="p"·data-group-id="2849157521-30">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-30">}</span><span·class="p">.</span><span·class="w">330 ····</span><span·class="p"·data-group-id="2983726247-30">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-30">}</span><span·class="p">.</span><span·class="w">
331 </span><span·class="nf">callback_mode</span><span·class="p"·data-group-id="2849157521-31">(</span><span·class="p"·data-group-id="2849157521-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">state_functions</span><span·class="p">.</span><span·class="w">331 </span><span·class="nf">callback_mode</span><span·class="p"·data-group-id="2983726247-31">(</span><span·class="p"·data-group-id="2983726247-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">state_functions</span><span·class="p">.</span><span·class="w">
  
332 </span><span·class="c1">%%%·state·callback(s)</span><span·class="w">332 </span><span·class="c1">%%%·state·callback(s)</span><span·class="w">
  
333 </span><span·class="nf">off</span><span·class="p"·data-group-id="2849157521-32">(</span><span·class="p"·data-group-id="2849157521-33">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="2849157521-33">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·145,·SHA:·a62db5ae26a485dfc0bc98d062556b858cda6113ce15231d58fe0436da3472b2·...·]-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">333 </span><span·class="nf">off</span><span·class="p"·data-group-id="2983726247-32">(</span><span·class="p"·data-group-id="2983726247-33">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="2983726247-33">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·145,·SHA:·6c31382938176645d2a03e8506ade305d2a2116f040ba899e20753a504d658e8·...·]-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
334 ····</span><span·class="c1">%%·Go·to·&#39;on&#39;,·increment·count·and·reply</span><span·class="w">334 ····</span><span·class="c1">%%·Go·to·&#39;on&#39;,·increment·count·and·reply</span><span·class="w">
335 ····</span><span·class="c1">%%·that·the·resulting·status·is·&#39;on&#39;</span><span·class="w">335 ····</span><span·class="c1">%%·that·the·resulting·status·is·&#39;on&#39;</span><span·class="w">
336 ····</span><span·class="p"·data-group-id="2849157521-34">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">on</span><span·class="p">,</span><span·class="n">Data</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·361,·SHA:·806b4a72410cb4936227a37466b00aa5a83926b2a0e12bbf058768a417252620·...·]-34">}</span><span·class="p">;</span><span·class="w">336 ····</span><span·class="p"·data-group-id="2983726247-34">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">on</span><span·class="p">,</span><span·class="n">Data</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·361,·SHA:·f6699440b0d8295dc2d68deee9a1b8cb91f46ab0ff8a307c9a4183a2fed7b962·...·]-34">}</span><span·class="p">;</span><span·class="w">
337 </span><span·class="nf">off</span><span·class="p"·data-group-id="2849157521-37">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">337 </span><span·class="nf">off</span><span·class="p"·data-group-id="2983726247-37">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
338 ····</span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2849157521-38">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-38">)</span><span·class="p">.</span><span·class="w">338 ····</span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2983726247-38">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-38">)</span><span·class="p">.</span><span·class="w">
  
339 </span><span·class="nf">on</span><span·class="p"·data-group-id="2849157521-39">(</span><span·class="p"·data-group-id="2849157521-40">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="2849157521-40">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·145,·SHA:·a62db5ae26a485dfc0bc98d062556b858cda6113ce15231d58fe0436da3472b2·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">339 </span><span·class="nf">on</span><span·class="p"·data-group-id="2983726247-39">(</span><span·class="p"·data-group-id="2983726247-40">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="2983726247-40">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·145,·SHA:·6c31382938176645d2a03e8506ade305d2a2116f040ba899e20753a504d658e8·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
340 ····</span><span·class="c1">%%·Go·to·&#39;off&#39;·and·reply·that·the·resulting·status·is·&#39;off&#39;</span><span·class="w">340 ····</span><span·class="c1">%%·Go·to·&#39;off&#39;·and·reply·that·the·resulting·status·is·&#39;off&#39;</span><span·class="w">
341 ····</span><span·class="p"·data-group-id="2849157521-41">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">off</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="2849157521-42">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·314,·SHA:·5a4f7b61ecced4f432f39baf915cf319763f8fd4af81083cd292ab308e9b8be0·...·]-41">}</span><span·class="p">;</span><span·class="w">341 ····</span><span·class="p"·data-group-id="2983726247-41">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">off</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="2983726247-42">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·314,·SHA:·76c69b60eeb23168e270db19235b493f4467c7cec1ce16548b7e99914bcf6eb3·...·]-41">}</span><span·class="p">;</span><span·class="w">
342 </span><span·class="nf">on</span><span·class="p"·data-group-id="2849157521-44">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-44">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">342 </span><span·class="nf">on</span><span·class="p"·data-group-id="2983726247-44">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-44">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
343 ····</span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2849157521-45">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-45">)</span><span·class="p">.</span><span·class="w">343 ····</span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2983726247-45">(</span><span·class="n">EventType</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventContent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-45">)</span><span·class="p">.</span><span·class="w">
  
344 </span><span·class="c1">%%·Handle·events·common·to·all·states</span><span·class="w">344 </span><span·class="c1">%%·Handle·events·common·to·all·states</span><span·class="w">
345 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2849157521-46">(</span><span·class="p"·data-group-id="2849157521-47">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="2849157521-47">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·150,·SHA:·7409a5627c8c44b84630e5cb5a696f195328234493ee014e1a4f505ac6c6b811·...·]-46">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">345 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2983726247-46">(</span><span·class="p"·data-group-id="2983726247-47">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="2983726247-47">}</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·150,·SHA:·8a401fbd0d1d26835bb7f4a34e2ab1f7f9a53306cce9512177348e0c043c11eb·...·]-46">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
346 ····</span><span·class="c1">%%·Reply·with·the·current·count</span><span·class="w">346 ····</span><span·class="c1">%%·Reply·with·the·current·count</span><span·class="w">
347 ····</span><span·class="p"·data-group-id="2849157521-48">{</span><span·class="ss">keep_state</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="2849157521-49">[</span><span·class="p"·data-group-id="2849157521-50">{</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·263,·SHA:·0a2936a1ed6763931f1cc460d8b0c72588074b02e830a4e409f15cab240fd2b7·...·]-48">}</span><span·class="p">;</span><span·class="w">347 ····</span><span·class="p"·data-group-id="2983726247-48">{</span><span·class="ss">keep_state</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="2983726247-49">[</span><span·class="p"·data-group-id="2983726247-50">{</span><span·class="ss">[·...·truncated·by·diffoscope;·len:·263,·SHA:·33f0a498f0e8ca0aaa35e380f8cc5f61092d874d8f0aca7ddc3b916cdf6c4799·...·]-48">}</span><span·class="p">;</span><span·class="w">
348 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2849157521-51">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-51">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">348 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="2983726247-51">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-51">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
349 ····</span><span·class="c1">%%·Ignore·all·other·events</span><span·class="w">349 ····</span><span·class="c1">%%·Ignore·all·other·events</span><span·class="w">
350 ····</span><span·class="p"·data-group-id="2849157521-52">{</span><span·class="ss">keep_state</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="2849157521-52">}</span><span·class="p">.</span></code></pre><p>The·following·is·a·shell·session·when·running·it:</p><p[·...·truncated·by·diffoscope;·len:·269,·SHA:·3a08563b4b29e3a78f69d200e3c797052e46a6261fd25562700fc5999d534c7c·...·]6-1">)</span><span·class="p">.</span><span·class="w">350 ····</span><span·class="p"·data-group-id="2983726247-52">{</span><span·class="ss">keep_state</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="2983726247-52">}</span><span·class="p">.</span></code></pre><p>The·following·is·a·shell·session·when·running·it:</p><p[·...·truncated·by·diffoscope;·len:·269,·SHA:·3a510bced02c5f74ba9c0a6909eed84c435c64eeabf166947e5bae7ed587d262·...·]6-1">)</span><span·class="p">.</span><span·class="w">
351 </span><span·class="p"·data-group-id="9580554116-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.36</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="9580554116-2">}</span><span·class="gp·unselectable">351 </span><span·class="p"·data-group-id="1259622386-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.36</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="1259622386-2">}</span><span·class="gp·unselectable">
352 2&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">get_count</span><span·class="p"·data-group-id="9580554116-3">(</span><span·class="p"·data-group-id="9580554116-3">)</span><span·class="p">.</span><span·class="w">352 2&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">get_count</span><span·class="p"·data-group-id="1259622386-3">(</span><span·class="p"·data-group-id="1259622386-3">)</span><span·class="p">.</span><span·class="w">
353 </span><span·class="mi">0</span><span·class="gp·unselectable">353 </span><span·class="mi">0</span><span·class="gp·unselectable">
354 3&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">push</span><span·class="p"·data-group-id="9580554116-4">(</span><span·class="p"·data-group-id="9580554116-4">)</span><span·class="p">.</span><span·class="w">354 3&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">push</span><span·class="p"·data-group-id="1259622386-4">(</span><span·class="p"·data-group-id="1259622386-4">)</span><span·class="p">.</span><span·class="w">
355 </span><span·class="ss">on</span><span·class="gp·unselectable">355 </span><span·class="ss">on</span><span·class="gp·unselectable">
356 4&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">get_count</span><span·class="p"·data-group-id="9580554116-5">(</span><span·class="p"·data-group-id="9580554116-5">)</span><span·class="p">.</span><span·class="w">356 4&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">get_count</span><span·class="p"·data-group-id="1259622386-5">(</span><span·class="p"·data-group-id="1259622386-5">)</span><span·class="p">.</span><span·class="w">
357 </span><span·class="mi">1</span><span·class="gp·unselectable">357 </span><span·class="mi">1</span><span·class="gp·unselectable">
358 5&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">push</span><span·class="p"·data-group-id="9580554116-6">(</span><span·class="p"·data-group-id="9580554116-6">)</span><span·class="p">.</span><span·class="w">358 5&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">push</span><span·class="p"·data-group-id="1259622386-6">(</span><span·class="p"·data-group-id="1259622386-6">)</span><span·class="p">.</span><span·class="w">
359 </span><span·class="ss">off</span><span·class="gp·unselectable">359 </span><span·class="ss">off</span><span·class="gp·unselectable">
360 6&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">get_count</span><span·class="p"·data-group-id="9580554116-7">(</span><span·class="p"·data-group-id="9580554116-7">)</span><span·class="p">.</span><span·class="w">360 6&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">get_count</span><span·class="p"·data-group-id="1259622386-7">(</span><span·class="p"·data-group-id="1259622386-7">)</span><span·class="p">.</span><span·class="w">
361 </span><span·class="mi">1</span><span·class="gp·unselectable">361 </span><span·class="mi">1</span><span·class="gp·unselectable">
362 7&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9580554116-8">(</span><span·class="p"·data-group-id="9580554116-8">)</span><span·class="p">.</span><span·class="w">362 7&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="1259622386-8">(</span><span·class="p"·data-group-id="1259622386-8">)</span><span·class="p">.</span><span·class="w">
363 </span><span·class="ss">ok</span><span·class="gp·unselectable">363 </span><span·class="ss">ok</span><span·class="gp·unselectable">
364 8&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">push</span><span·class="p"·data-group-id="9580554116-9">(</span><span·class="p"·data-group-id="9580554116-9">)</span><span·class="p">.</span><span·class="w">364 8&gt;·</span><span·class="nc">pushbutton</span><span·class="p">:</span><span·class="nf">push</span><span·class="p"·data-group-id="1259622386-9">(</span><span·class="p"·data-group-id="1259622386-9">)</span><span·class="p">.</span><span·class="w">
365 </span><span·class="gt">**·exception·exit:·{noproc,{gen_statem,call,[pushbutton_statem,push,infinity]}}365 </span><span·class="gt">**·exception·exit:·{noproc,{gen_statem,call,[pushbutton_statem,push,infinity]}}
366 ·····in·function··gen:do_for_proc/2·(gen.erl,·line·261)366 ·····in·function··gen:do_for_proc/2·(gen.erl,·line·261)
367 ·····in·call·from·gen_statem:call/3·(gen_statem.erl,·line·386)</span></code></pre><p>To·compare·styles,·here·follows·the·same·example·using367 ·····in·call·from·gen_statem:call/3·(gen_statem.erl,·line·386)</span></code></pre><p>To·compare·styles,·here·follows·the·same·example·using
368 <a·href="#t:callback_mode/0"><em>callback·mode</em></a>·<code·class="inline">handle_event_function</code>,368 <a·href="#t:callback_mode/0"><em>callback·mode</em></a>·<code·class="inline">handle_event_function</code>,
369 or·rather,·the·code·to·replace·after·function·<a·href="#c:init/1"><code·class="inline">init/1</code></a>369 or·rather,·the·code·to·replace·after·function·<a·href="#c:init/1"><code·class="inline">init/1</code></a>
370 of·the·<code·class="inline">pushbutton.erl</code>·example·file·above:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">callback_mode</span><span·class="p"·data-group-id="9627752189-1">(</span><span·class="p"·data-group-id="9627752189-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">handle_event_function</span><span·class="p">.</span><span·class="w">370 of·the·<code·class="inline">pushbutton.erl</code>·example·file·above:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">callback_mode</span><span·class="p"·data-group-id="0977701226-1">(</span><span·class="p"·data-group-id="0977701226-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">handle_event_function</span><span·class="p">.</span><span·class="w">
  
371 </span><span·class="c1">%%%·state·callback(s)</span><span·class="w">371 </span><span·class="c1">%%%·state·callback(s)</span><span·class="w">
  
372 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="9627752189-2">(</span><span·class="p"·data-group-id="9627752189-3">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="9627752189-3">}</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·218,·SHA:·112fab5ed97dc31c033a146e06a5f76da0be581a7d7d261ed7a292dad0b52207·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">372 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="0977701226-2">(</span><span·class="p"·data-group-id="0977701226-3">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="0977701226-3">}</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·218,·SHA:·5caa122a79add57e866c8ab9cfd06ee0e98366aa8c5dd37838168891c87dc557·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
373 ····</span><span·class="c1">%%·Go·to·&#39;on&#39;,·increment·count·and·reply</span><span·class="w">373 ····</span><span·class="c1">%%·Go·to·&#39;on&#39;,·increment·count·and·reply</span><span·class="w">
374 ····</span><span·class="c1">%%·that·the·resulting·status·is·&#39;on&#39;</span><span·class="w">374 ····</span><span·class="c1">%%·that·the·resulting·status·is·&#39;on&#39;</span><span·class="w">
375 ····</span><span·class="p"·data-group-id="9627752189-4">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">on</span><span·class="p">,</span><span·class="n">Data</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·357,·SHA:·b4d7c9c6671e77d41c1e4e5a726b83ee9d7409f10925892b35de9d1659534e02·...·]-4">}</span><span·class="p">;</span><span·class="w">375 ····</span><span·class="p"·data-group-id="0977701226-4">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">on</span><span·class="p">,</span><span·class="n">Data</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·357,·SHA:·f5bc191ea2a51250ff59bb75d1dd6761dbe4738a271fe73442562c62d92ae6c9·...·]-4">}</span><span·class="p">;</span><span·class="w">
376 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="9627752189-7">(</span><span·class="p"·data-group-id="9627752189-8">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="9627752189-8">}</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·217,·SHA:·cc71da3da1bc46a2ceddc901aa86ac21a7f852cb3e22e9abd326161ab9f842e1·...·]-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">376 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="0977701226-7">(</span><span·class="p"·data-group-id="0977701226-8">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="0977701226-8">}</span><span·class="p">,</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·217,·SHA:·8b406b5420cbc3a88621d2bb777c017568a0fa957414c5011c37336e6e6c7c80·...·]-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
377 ····</span><span·class="c1">%%·Go·to·&#39;off&#39;·and·reply·that·the·resulting·status·is·&#39;off&#39;</span><span·class="w">377 ····</span><span·class="c1">%%·Go·to·&#39;off&#39;·and·reply·that·the·resulting·status·is·&#39;off&#39;</span><span·class="w">
378 ····</span><span·class="p"·data-group-id="9627752189-9">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">off</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="9627752189-10">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·314,·SHA:·33fa43139c27842b15dbda7458b5273abe3e0a388e2e76d7566bf47ee83465fb·...·]-9">}</span><span·class="p">;</span><span·class="w">378 ····</span><span·class="p"·data-group-id="0977701226-9">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="ss">off</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="0977701226-10">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·314,·SHA:·80359ce197ace731d31ae576419446717870bbe401f7a530d45f6eb49a23cfb4·...·]-9">}</span><span·class="p">;</span><span·class="w">
379 </span><span·class="c1">%%</span><span·class="w">379 </span><span·class="c1">%%</span><span·class="w">
380 </span><span·class="c1">%%·Event·handling·common·to·all·states</span><span·class="w">380 </span><span·class="c1">%%·Event·handling·common·to·all·states</span><span·class="w">
381 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="9627752189-12">(</span><span·class="p"·data-group-id="9627752189-13">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="9627752189-13">}</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·227,·SHA:·94c740fa22e8638ef45f89f5cc87c1141149482593dc5f67bc3f42c083c7f67f·...·]-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">381 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="0977701226-12">(</span><span·class="p"·data-group-id="0977701226-13">{</span><span·class="ss">call</span><span·class="p">,</span><span·class="n">From</span><span·class="p"·data-group-id="0977701226-13">}</span><span·class="p">,</span><span·class="w">·</spa[·...·truncated·by·diffoscope;·len:·227,·SHA:·fcdb2ea55064a680d0b5b4ae5c5813fdf93f895a35df674ee153fd7cf8a8dffd·...·]-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
382 ····</span><span·class="c1">%%·Reply·with·the·current·count</span><span·class="w">382 ····</span><span·class="c1">%%·Reply·with·the·current·count</span><span·class="w">
383 ····</span><span·class="p"·data-group-id="9627752189-14">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="9627752189-15">[</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·316,·SHA:·fb3da44fa22fb1f1439c957c873aa91a49e06c871a0d19b7ba228d57e9791a0a·...·]-14">}</span><span·class="p">;</span><span·class="w">383 ····</span><span·class="p"·data-group-id="0977701226-14">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p">,</span><span·class="p"·data-group-id="0977701226-15">[</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·316,·SHA:·437798ac25da4c09176eb5c8d129513b218378fe9d1e034800f652ee01ed5128·...·]-14">}</span><span·class="p">;</span><span·class="w">
384 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="9627752189-17">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·55,·SHA:·83f1a197111580a7728c351d77afc75078fd74967228602f86d031e7b16073d2·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">384 </span><span·class="nf">handle_event</span><span·class="p"·data-group-id="0977701226-17">(</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·55,·SHA:·bc4ab9a3c180dd994ed5aadb99b549cbb24cb4a701cbf147ff4b69103dd412e1·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
385 ····</span><span·class="c1">%%·Ignore·all·other·events</span><span·class="w">385 ····</span><span·class="c1">%%·Ignore·all·other·events</span><span·class="w">
386 ····</span><span·class="p"·data-group-id="9627752189-18">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="9627752189-18">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><h2·id="module-api-changes"·class="section-heading">386 ····</span><span·class="p"·data-group-id="0977701226-18">{</span><span·class="ss">next_state</span><span·class="p">,</span><span·class="n">State</span><span·class="p">,</span><span·class="n">Data</span><span·class="p"·data-group-id="0977701226-18">}</span><span·class="p">.</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><h2·id="module-api-changes"·class="section-heading">
387 ··<a·href="#module-api-changes"·class="hover-link">387 ··<a·href="#module-api-changes"·class="hover-link">
388 ····<i·class="ri-link-m"·aria-hidden="true"></i>388 ····<i·class="ri-link-m"·aria-hidden="true"></i>
389 ··</a>389 ··</a>
390 ··<span·class="text">API·changes</span>390 ··<span·class="text">API·changes</span>
391 </h2>391 </h2>
392 <ul><li>This·behavior·appeared·in·Erlang/OTP·19.0·as·experimental.</li><li>In·OTP·19.1·a·backwards·incompatible·change·of·the·return·tuple·from392 <ul><li>This·behavior·appeared·in·Erlang/OTP·19.0·as·experimental.</li><li>In·OTP·19.1·a·backwards·incompatible·change·of·the·return·tuple·from
393 <a·href="#c:init/1"><code·class="inline">Module:init/1</code></a>·was·made,393 <a·href="#c:init/1"><code·class="inline">Module:init/1</code></a>·was·made,
Offset 3083, 23 lines modifiedOffset 3083, 23 lines modified
3083 return·value·and·how·its·status·appears·in·termination·error·logs,3083 return·value·and·how·its·status·appears·in·termination·error·logs,
3084 exports·an·instance·of·<a·href="#c:format_status/1"><code·class="inline">Module:format_status/1</code></a>,3084 exports·an·instance·of·<a·href="#c:format_status/1"><code·class="inline">Module:format_status/1</code></a>,
3085 which·will·get·a·map·<code·class="inline">Status</code>·that·describes·the·current·state3085 which·will·get·a·map·<code·class="inline">Status</code>·that·describes·the·current·state
3086 of·the·<code·class="inline">gen_statem</code>,·and·shall·return·a·map·<code·class="inline">NewStatus</code>3086 of·the·<code·class="inline">gen_statem</code>,·and·shall·return·a·map·<code·class="inline">NewStatus</code>
3087 containing·the·same·keys·as·the·input·map,3087 containing·the·same·keys·as·the·input·map,
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185 ······<p·class="built-using">185 ······<p·class="built-using">
186 ········Built·using186 ········Built·using
187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the187 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>188 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
189 ······</p>189 ······</p>
190 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>190 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
191 ····</footer>191 ····</footer>
192 ··</div>192 ··</div>
193 </main>193 </main>
194 </div>194 </div>
195 <script>195 <script>
196 ··function·mermaidLoaded()·{196 ··function·mermaidLoaded()·{
197 ····mermaid.initialize({197 ····mermaid.initialize({
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998 <p>Tries·to·read·<code·class="inline">String</code>·in·accordance·with·the·control·sequences·in·<code·class="inline">Format</code>.</p><p>For·a·detailed·description·of·the·available·formatting·options,·see·<a·href="io.html#fread/3"><code·class="inline">io:fread/3</code></a>.998 <p>Tries·to·read·<code·class="inline">String</code>·in·accordance·with·the·control·sequences·in·<code·class="inline">Format</code>.</p><p>For·a·detailed·description·of·the·available·formatting·options,·see·<a·href="io.html#fread/3"><code·class="inline">io:fread/3</code></a>.
999 It·is·assumed·that·<code·class="inline">String</code>·contains·whole·lines.</p><p>The·function·returns:</p><ul><li><p><strong><code·class="inline">{ok,·InputList,·LeftOverChars}</code></strong>·-·The·string·was·read.·<code·class="inline">InputList</code>·is·the999 It·is·assumed·that·<code·class="inline">String</code>·contains·whole·lines.</p><p>The·function·returns:</p><ul><li><p><strong><code·class="inline">{ok,·InputList,·LeftOverChars}</code></strong>·-·The·string·was·read.·<code·class="inline">InputList</code>·is·the
1000 list·of·successfully·matched·and·read·items,·and·<code·class="inline">LeftOverChars</code>·are·the·input1000 list·of·successfully·matched·and·read·items,·and·<code·class="inline">LeftOverChars</code>·are·the·input
1001 characters·not·used.</p></li><li><p><strong><code·class="inline">{more,·RestFormat,·Nchars,·InputStack}</code></strong>·-·The·string·was·read,·but·more1001 characters·not·used.</p></li><li><p><strong><code·class="inline">{more,·RestFormat,·Nchars,·InputStack}</code></strong>·-·The·string·was·read,·but·more
1002 input·is·needed·to·complete·the·original·format·string.·<code·class="inline">RestFormat</code>·is·the1002 input·is·needed·to·complete·the·original·format·string.·<code·class="inline">RestFormat</code>·is·the
1003 remaining·format·string,·<code·class="inline">Nchars</code>·is·the·number·of·characters·scanned,·and1003 remaining·format·string,·<code·class="inline">Nchars</code>·is·the·number·of·characters·scanned,·and
1004 <code·class="inline">InputStack</code>·is·the·reversed·list·of·inputs·matched·up·to·that·point.</p></li><li><p><strong><code·class="inline">{error,·What}</code></strong>·-·The·read·operation·failed·and·parameter·<code·class="inline">What</code>·gives·a1004 <code·class="inline">InputStack</code>·is·the·reversed·list·of·inputs·matched·up·to·that·point.</p></li><li><p><strong><code·class="inline">{error,·What}</code></strong>·-·The·read·operation·failed·and·parameter·<code·class="inline">What</code>·gives·a
1005 hint·about·the·error.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">fread</span><span·class="p"·data-group-id="3602448824-1">(</span><span·class="s">&quot;~f~f~f&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;15.6·17.3e-6·24.5&quot;</span><span·class="p"·data-group-id="3602448824-1">)</span><span·class="p">.</span><span·class="w">1005 hint·about·the·error.</p></li></ul><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">fread</span><span·class="p"·data-group-id="1629085354-1">(</span><span·class="s">&quot;~f~f~f&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;15.6·17.3e-6·24.5&quot;</span><span·class="p"·data-group-id="1629085354-1">)</span><span·class="p">.</span><span·class="w">
1006 </span><span·class="p"·data-group-id="3602448824-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3602448824-3">[</span><span·class="mf">15.6</span><span·class="p">,</span><span·class="mf">1.73e-5</span><span·class="p">,</span><span·class="mf">24.5</s[·...·truncated·by·diffoscope;·len:·227,·SHA:·21b903fa9cc974ff5d7587961f9acd226d3527f4f3a1bfbcb77d69f8fb76e45a·...·]4-2">}</span></code></pre>1006 </span><span·class="p"·data-group-id="1629085354-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1629085354-3">[</span><span·class="mf">15.6</span><span·class="p">,</span><span·class="mf">1.73e-5</span><span·class="p">,</span><span·class="mf">24.5</s[·...·truncated·by·diffoscope;·len:·227,·SHA:·311ef3c6e02e635e25c554f7c3ee4198a7e38d53d2d1fe2fcad384391be48ff0·...·]4-2">}</span></code></pre>
1007 ··</section>1007 ··</section>
1008 </section>1008 </section>
1009 <section·class="detail"·id="fread/3">1009 <section·class="detail"·id="fread/3">
  
1010 ··<div·class="detail-header">1010 ··<div·class="detail-header">
1011 ····<a·href="#fread/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1011 ····<a·href="#fread/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1012 ······<i·class="ri-link-m"·aria-hidden="true"></i>1012 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1474 ······</div>1474 ······</div>
  
1475 <p>Returns·a·character·list·that·represents·<code·class="inline">Term</code>.·Option·<code·class="inline">Depth</code>·controls·the1475 <p>Returns·a·character·list·that·represents·<code·class="inline">Term</code>.·Option·<code·class="inline">Depth</code>·controls·the
1476 depth·of·the·structures·written.</p><p>When·the·specified·depth·is·reached,·everything·below·this·level·is·replaced·by1476 depth·of·the·structures·written.</p><p>When·the·specified·depth·is·reached,·everything·below·this·level·is·replaced·by
1477 &quot;<code·class="inline">...</code>&quot;.</p><p><code·class="inline">Depth</code>·defaults·to·-1,·which·means·no·limitation.·Option·<code·class="inline">CharsLimit</code>·puts·a1477 &quot;<code·class="inline">...</code>&quot;.</p><p><code·class="inline">Depth</code>·defaults·to·-1,·which·means·no·limitation.·Option·<code·class="inline">CharsLimit</code>·puts·a
1478 soft·limit·on·the·number·of·characters·returned.·When·the·number·of·characters·is1478 soft·limit·on·the·number·of·characters·returned.·When·the·number·of·characters·is
1479 reached,·remaining·structures·are·replaced·by·&quot;<code·class="inline">...</code>&quot;.·<code·class="inline">CharsLimit</code>·defaults·to·-1,1479 reached,·remaining·structures·are·replaced·by·&quot;<code·class="inline">...</code>&quot;.·<code·class="inline">CharsLimit</code>·defaults·to·-1,
1480 which·means·no·limit·on·the·number·of·characters·returned.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="6290237338-1">(</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="6290237338-2">(</span><span·class="p"·data-group-id="6290237338-3">{</span><span·class="mi">1</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·837,·SHA:·9556e58db8475e262d4c01b5577ea81a61950d65c34fbf867acbcda0a15b0f2e·...·]-1">)</span><span·class="p">.</span><span·class="w">1480 which·means·no·limit·on·the·number·of·characters·returned.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="7705947783-1">(</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7705947783-2">(</span><span·class="p"·data-group-id="7705947783-3">{</span><span·class="mi">1</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·837,·SHA:·57a522dd1d64b8602293e566842be89835044a52b36eb983ff852724ba18be56·...·]-1">)</span><span·class="p">.</span><span·class="w">
1481 </span><span·class="s">&quot;{1,[2],[3],[4,5],6,7,8,9}&quot;</span><span·class="gp·unselectable">1481 </span><span·class="s">&quot;{1,[2],[3],[4,5],6,7,8,9}&quot;</span><span·class="gp·unselectable">
1482 2&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="6290237338-7">(</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="6290237338-8">(</span><span·class="p"·data-group-id="6290237338-9">{</span><span·class="mi">1</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·916,·SHA:·835a6ebd4a89610689d8088cd93d2ce5907fc42e6d8081f7e8c43acf212ab8aa·...·]-7">)</span><span·class="p">.</span><span·class="w">1482 2&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="7705947783-7">(</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7705947783-8">(</span><span·class="p"·data-group-id="7705947783-9">{</span><span·class="mi">1</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·916,·SHA:·2feb71264a6d5c9720aa6536a0a66fb38d28371cd25229b877f8032699a45187·...·]-7">)</span><span·class="p">.</span><span·class="w">
1483 </span><span·class="s">&quot;{1,[2],[3],[...],...}&quot;</span><span·class="gp·unselectable">1483 </span><span·class="s">&quot;{1,[2],[3],[...],...}&quot;</span><span·class="gp·unselectable">
1484 3&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="6290237338-13">(</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="6290237338-14">(</span><span·class="p"·data-group-id="6290237338-15">{</span><span·class="p"·data-group-id="6290237338-[·...·truncated·by·diffoscope;·len:·1089,·SHA:·d53cc5c83245c35faee6c063bbb337b072e76d60585c93695374fe6cc5cf404b·...·]-13">)</span><span·class="p">.</span><span·class="w">1484 3&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="7705947783-13">(</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="7705947783-14">(</span><span·class="p"·data-group-id="7705947783-15">{</span><span·class="p"·data-group-id="7705947783-[·...·truncated·by·diffoscope;·len:·1089,·SHA:·70f136bba923cdc6235382b1eb0bec8820f6fda127211b84676466c5694f8dc8·...·]-13">)</span><span·class="p">.</span><span·class="w">
1485 </span><span·class="s">&quot;{[1,2|...],[4|...],...}&quot;</span></code></pre>1485 </span><span·class="s">&quot;{[1,2|...],[4|...],...}&quot;</span></code></pre>
1486 ··</section>1486 ··</section>
1487 </section>1487 </section>
1488 <section·class="detail"·id="write_atom/1">1488 <section·class="detail"·id="write_atom/1">
  
1489 ··<div·class="detail-header">1489 ··<div·class="detail-header">
1490 ····<a·href="#write_atom/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1490 ····<a·href="#write_atom/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1731, 15 lines modifiedOffset 1731, 15 lines modified
1731 ······<p·class="built-using">1731 ······<p·class="built-using">
1732 ········Built·using1732 ········Built·using
1733 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1733 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1734 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1734 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1735 ······</p>1735 ······</p>
1736 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1736 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1737 ····</footer>1737 ····</footer>
1738 ··</div>1738 ··</div>
1739 </main>1739 </main>
1740 </div>1740 </div>
1741 <script>1741 <script>
1742 ··function·mermaidLoaded()·{1742 ··function·mermaidLoaded()·{
1743 ····mermaid.initialize({1743 ····mermaid.initialize({
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977 </h2>977 </h2>
978 <ul><li><code·class="inline">error(unexpected_end)</code>·if·<code·class="inline">Binary</code>·contains·incomplete·JSON·value</li><li><code·class="inline">error({invalid_byte,·Byte})</code>·if·<code·class="inline">Binary</code>·contains·unexpected·byte·or·invalid·UTF-8·byte</li><li><code·class="inline">error({unexpected_sequence,·Bytes})</code>·if·<code·class="inline">Binary</code>·contains·invalid·UTF-8·escape</li></ul><h2·id="decode/1-example"·class="section-heading">978 <ul><li><code·class="inline">error(unexpected_end)</code>·if·<code·class="inline">Binary</code>·contains·incomplete·JSON·value</li><li><code·class="inline">error({invalid_byte,·Byte})</code>·if·<code·class="inline">Binary</code>·contains·unexpected·byte·or·invalid·UTF-8·byte</li><li><code·class="inline">error({unexpected_sequence,·Bytes})</code>·if·<code·class="inline">Binary</code>·contains·invalid·UTF-8·escape</li></ul><h2·id="decode/1-example"·class="section-heading">
979 ··<a·href="#decode/1-example"·class="hover-link">979 ··<a·href="#decode/1-example"·class="hover-link">
980 ····<i·class="ri-link-m"·aria-hidden="true"></i>980 ····<i·class="ri-link-m"·aria-hidden="true"></i>
981 ··</a>981 ··</a>
982 ··<span·class="text">Example</span>982 ··<span·class="text">Example</span>
983 </h2>983 </h2>
984 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="7304574770-1">(</span><span·class="p"·data-group-id="7304574770-2">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:·1}&quot;</span><span·class="p"·data-group-id="7304574770-2">&gt;&gt;</span><span·class="p"·data-group-id="7304574770-1">)</span><span·class="p">.</span><span·class="w">984 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="2573616104-1">(</span><span·class="p"·data-group-id="2573616104-2">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:·1}&quot;</span><span·class="p"·data-group-id="2573616104-2">&gt;&gt;</span><span·class="p"·data-group-id="2573616104-1">)</span><span·class="p">.</span><span·class="w">
985 </span><span·class="p"·data-group-id="7304574770-3">#{</span><span·class="p"·data-group-id="7304574770-4">&lt;&lt;</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="7304574770-4">&gt;&gt;</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·67,·SHA:·68d3823bcc906759a9f0a571357570a936b73190412117f8a9ee5a2eb15ea7c3·...·]-3">}</span></code></pre>985 </span><span·class="p"·data-group-id="2573616104-3">#{</span><span·class="p"·data-group-id="2573616104-4">&lt;&lt;</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="2573616104-4">&gt;&gt;</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·67,·SHA:·3e7a46b2afbf282692ce3856d965c546e88d198f66fc7a82de1c949a9966bc77·...·]-3">}</span></code></pre>
986 ··</section>986 ··</section>
987 </section>987 </section>
988 <section·class="detail"·id="decode/3">988 <section·class="detail"·id="decode/3">
  
989 ··<div·class="detail-header">989 ··<div·class="detail-header">
990 ····<a·href="#decode/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">990 ····<a·href="#decode/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
991 ······<i·class="ri-link-m"·aria-hidden="true"></i>991 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1028, 17 lines modifiedOffset 1028, 17 lines modified
1028 </h2>1028 </h2>
1029 <ul><li><code·class="inline">error({invalid_byte,·Byte})</code>·if·<code·class="inline">Binary</code>·contains·unexpected·byte·or·invalid·UTF-8·byte</li><li><code·class="inline">error({unexpected_sequence,·Bytes})</code>·if·<code·class="inline">Binary</code>·contains·invalid·UTF-8·escape</li><li><code·class="inline">error(unexpected_end)</code>·if·<code·class="inline">Binary</code>·contains·incomplete·JSON·value</li></ul><h2·id="decode/3-example"·class="section-heading">1029 <ul><li><code·class="inline">error({invalid_byte,·Byte})</code>·if·<code·class="inline">Binary</code>·contains·unexpected·byte·or·invalid·UTF-8·byte</li><li><code·class="inline">error({unexpected_sequence,·Bytes})</code>·if·<code·class="inline">Binary</code>·contains·invalid·UTF-8·escape</li><li><code·class="inline">error(unexpected_end)</code>·if·<code·class="inline">Binary</code>·contains·incomplete·JSON·value</li></ul><h2·id="decode/3-example"·class="section-heading">
1030 ··<a·href="#decode/3-example"·class="hover-link">1030 ··<a·href="#decode/3-example"·class="hover-link">
1031 ····<i·class="ri-link-m"·aria-hidden="true"></i>1031 ····<i·class="ri-link-m"·aria-hidden="true"></i>
1032 ··</a>1032 ··</a>
1033 ··<span·class="text">Example</span>1033 ··<span·class="text">Example</span>
1034 </h2>1034 </h2>
1035 <p>Decoding·object·keys·as·atoms:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">Push</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0430353234-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="0430353234-1">)</span><span[·...·truncated·by·diffoscope;·len:·624,·SHA:·e1c6ae9d7e595b88d4e3a8955e01df7c3f1c94e3e99be512ec6b17d1c717383b·...·]-2">]</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="gp·unselectable">1035 <p>Decoding·object·keys·as·atoms:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">Push</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7923175716-1">(</span><span·class="n">Key</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Value</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="7923175716-1">)</span><span[·...·truncated·by·diffoscope;·len:·624,·SHA:·8a023f904dae59628af1df78bdad4da880f4e078570f96419645122361e57c34·...·]-2">]</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="gp·unselectable">
1036 &gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="0430353234-5">(</span><span·class="p"·data-group-id="0430353234-6">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:·1}&quot;</span><span·class="p"·data-group-id="0430353234-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·351,·SHA:·85730cc288151ae1a0ef3609540af9b9d0842fdf09dd230a738929b000b25887·...·]-5">)</span><span·class="p">.</span><span·class="w">1036 &gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode</span><span·class="p"·data-group-id="7923175716-5">(</span><span·class="p"·data-group-id="7923175716-6">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:·1}&quot;</span><span·class="p"·data-group-id="7923175716-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·351,·SHA:·c6f19acfcbbfed312cf23683dac166113bb4553faa8fc8755936b66c2300bcec·...·]-5">)</span><span·class="p">.</span><span·class="w">
1037 </span><span·class="p"·data-group-id="0430353234-8">{</span><span·class="p"·data-group-id="0430353234-9">#{</span><span·class="ss">foo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="0430353234-9">}</span[·...·truncated·by·diffoscope;·len:·238,·SHA:·db46ab0f03e2a2b5c2485e3aea1808a1b8fd76bd549b7bfa439191b6d65b90f8·...·]-8">}</span></code></pre>1037 </span><span·class="p"·data-group-id="7923175716-8">{</span><span·class="p"·data-group-id="7923175716-9">#{</span><span·class="ss">foo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="7923175716-9">}</span[·...·truncated·by·diffoscope;·len:·238,·SHA:·83348daddbb5c2a260efd2d55eed4785f703768e7777702d1d251665d24a2d0f·...·]-8">}</span></code></pre>
1038 ··</section>1038 ··</section>
1039 </section>1039 </section>
1040 <section·class="detail"·id="decode_continue/2">1040 <section·class="detail"·id="decode_continue/2">
  
1041 ··<div·class="detail-header">1041 ··<div·class="detail-header">
1042 ····<a·href="#decode_continue/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1042 ····<a·href="#decode_continue/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1043 ······<i·class="ri-link-m"·aria-hidden="true"></i>1043 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1061, 19 lines modifiedOffset 1061, 19 lines modified
1061 ··········<pre·translate="no"><span·class="attribute">-spec</span>·decode_continue(<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()·|·end_of_input,·Opaque·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->1061 ··········<pre·translate="no"><span·class="attribute">-spec</span>·decode_continue(<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()·|·end_of_input,·Opaque·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>())·->
1062 ·························{Result·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:dynamic/0">dynamic</a>(),·Acc·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:dynamic/0">dynamic</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}·|1062 ·························{Result·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:dynamic/0">dynamic</a>(),·Acc·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:dynamic/0">dynamic</a>(),·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()}·|
1063 ·························{continue,·<a·href="#t:continuation_state/0">continuation_state</a>()}.</pre>1063 ·························{continue,·<a·href="#t:continuation_state/0">continuation_state</a>()}.</pre>
  
1064 ······</div>1064 ······</div>
  
1065 <p>Continue·parsing·a·stream·of·bytes·of·a·JSON·value.</p><p>Similar·to·<a·href="#decode_start/3"><code·class="inline">decode_start/3</code></a>,·if·the·function·returns·<code·class="inline">{continue,·State}</code>·and1065 <p>Continue·parsing·a·stream·of·bytes·of·a·JSON·value.</p><p>Similar·to·<a·href="#decode_start/3"><code·class="inline">decode_start/3</code></a>,·if·the·function·returns·<code·class="inline">{continue,·State}</code>·and
1066 there·is·no·more·data,·use·<code·class="inline">end_of_input</code>·instead·of·a·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="2040971031-1">{</span><span·class="ss">continue</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="2040971031-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode_start</span><span·class="p"·data-group-id="2040971031-2">(</span><span·class="p"·data-group-id="2040971031-3">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:&quot;</span><span·class="p"·data-group-id="2040971031-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2040971031-4">#{</span><span·class="p"·data-group-id="2040971031-4">}</span><span·class="p"·data-group-id="2040971031-2">)</span><span·class="p">.</span><span·class="gp·unselectable"> 
1067 &gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode_continue</span><span·class="p"·data-group-id="2040971031-5">(</span><span·class="p"·data-group-id="2040971031-6">&lt;&lt;</span><span·class="s">&quot;1}&quot;</span><span·class="p"·data-group-id="2040971031-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="2040971031-5">)</span><span·class="p">.</span><span·class="w"> 
1068 </span><span·class="p"·data-group-id="2040971031-7">{</span><span·class="p"·data-group-id="2040971031-8">#{</span><span·class="ss">foo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p[·...·truncated·by·diffoscope;·len:·1244,·SHA:·c5acab2eee6ee62c44dd5fd0aa89c580fc70f950389a3026ce0a67cf0a584050·...·]-2">)</span><span·class="p">.</span><span·class="gp·unselectable">1066 there·is·no·more·data,·use·<code·class="inline">end_of_input</code>·instead·of·a·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="6088033148-1">{</span><span·class="ss">cont[·...·truncated·by·diffoscope;·len:·797,·SHA:·021bba2a309111ab9fa86c1cbd7253d1bcfaaadfe81574e338c554b6be55e2d1·...·]-2">)</span><span·class="p">.</span><span·class="gp·unselectable">
 1067 &gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode_continue</span><span·class="p"·data-group-id="6088033148-5">(</span><span·class="p"·data-group-id="6088033148-6">&lt;&lt;</span><span·class="s">&quot;1}&quot;</span><span·class="p"·data-group-id="6088033148-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="6088033148-5">)</span><span·class="p">.</span><span·class="w">
 1068 </span><span·class="p"·data-group-id="6088033148-7">{</span><span·class="p"·data-group-id="6088033148-8">#{</span><span·class="ss">foo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id="6088033148-8">}</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="6088033148-9">&lt;&lt;</span><span·class="p"·data-group-id="6088033148-9">&gt;&gt;</span><span·class="p"·data-group-id="6088033148-7">}</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="p"·data-group-id="7866031806-1">{</span><span·class="ss">continue</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="7866031806-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode_start</span><span·class="p"·data-group-id="7866031806-2">(</span><span·class="p"·data-group-id="7866031806-3">&lt;&lt;</span><span·class="s">&quot;123&quot;</span><span·class="p"·data-group-id="7866031806-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7866031806-4">#{</span><span·class="p"·data-group-id="7866031806-4">}</span><span·class="p"·data-group-id="7866031806-2">)</span><span·class="p">.</span><span·class="gp·unselectable">
1069 &gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode_continue</span><span·class="p"·data-group-id="4628397195-5">(</span><span·class="ss">end_of_input</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="4628397195-5">)</span><span·class="p">.</span><span·class="w">1069 &gt;·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">decode_continue</span><span·class="p"·data-group-id="7866031806-5">(</span><span·class="ss">end_of_input</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="7866031806-5">)</span><span·class="p">.</span><span·class="w">
1070 </span><span·class="p"·data-group-id="4628397195-6">{</span><span·class="mi">123</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4628397195-7">&lt;&lt;</span><span·class="p"·data-group-id="4628397195-7">&gt;&gt;</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·cc14362a84341066bab8119f71e03b6e91f26c798a32576fcec3b84044f0b77e·...·]-6">}</span></code></pre>1070 </span><span·class="p"·data-group-id="7866031806-6">{</span><span·class="mi">123</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7866031806-7">&lt;&lt;</span><span·class="p"·data-group-id="7866031806-7">&gt;&gt;</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·1679b127d41f78d6ae126a5443d4d3acb0372ac863db60b013b8998f31dd47f9·...·]-6">}</span></code></pre>
1071 ··</section>1071 ··</section>
1072 </section>1072 </section>
1073 <section·class="detail"·id="decode_start/3">1073 <section·class="detail"·id="decode_start/3">
  
1074 ··<div·class="detail-header">1074 ··<div·class="detail-header">
1075 ····<a·href="#decode_start/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1075 ····<a·href="#decode_start/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1076 ······<i·class="ri-link-m"·aria-hidden="true"></i>1076 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1131 <p>Generates·JSON·corresponding·to·<code·class="inline">Term</code>.</p><p>Supports·basic·data·mapping:</p><table><thead><tr><th·style="text-align:·left;"><strong>Erlang</strong></th><th·style="text-align:·left;"><strong>JSON</strong></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">integer()·|·float()</code></td><td·style="text-align:·left;">Number</td></tr><tr><td·style="text-align:·left;"><code·class="inline">true·|·false</code></td><td·style="text-align:·left;">Boolean</td></tr><tr><td·style="text-align:·left;"><code·class="inline">null</code></td><td·style="text-align:·left;">Null</td></tr><tr><td·style="text-align:·left;"><code·class="inline">binary()</code></td><td·style="text-align:·left;">String</td></tr><tr><td·style="text-align:·left;"><code·class="inline">atom()</code></td><td·style="text-align:·left;">String</td></tr><tr><td·style="text-align:·left;"><code·class="inline">list()</code></td><td·style="text-align:·left;">Array</td></tr><tr><td·style="text-align:·left;"><code·class="inline">#{binary()·=&gt;·_}</code></td><td·style="text-align:·left;">Object</td></tr><tr><td·style="text-align:·left;"><code·class="inline">#{atom()·=&gt;·_}</code></td><td·style="text-align:·left;">Object</td></tr><tr><td·style="text-align:·left;"><code·class="inline">#{integer()·=&gt;·_}</code></td><td·style="text-align:·left;">Object</td></tr></tbody></table><p>This·is·equivalent·to·<code·class="inline">encode(Term,·fun·json:encode_value/2)</code>.</p><h2·id="encode/1-examples"·class="section-heading">1131 <p>Generates·JSON·corresponding·to·<code·class="inline">Term</code>.</p><p>Supports·basic·data·mapping:</p><table><thead><tr><th·style="text-align:·left;"><strong>Erlang</strong></th><th·style="text-align:·left;"><strong>JSON</strong></th></tr></thead><tbody><tr><td·style="text-align:·left;"><code·class="inline">integer()·|·float()</code></td><td·style="text-align:·left;">Number</td></tr><tr><td·style="text-align:·left;"><code·class="inline">true·|·false</code></td><td·style="text-align:·left;">Boolean</td></tr><tr><td·style="text-align:·left;"><code·class="inline">null</code></td><td·style="text-align:·left;">Null</td></tr><tr><td·style="text-align:·left;"><code·class="inline">binary()</code></td><td·style="text-align:·left;">String</td></tr><tr><td·style="text-align:·left;"><code·class="inline">atom()</code></td><td·style="text-align:·left;">String</td></tr><tr><td·style="text-align:·left;"><code·class="inline">list()</code></td><td·style="text-align:·left;">Array</td></tr><tr><td·style="text-align:·left;"><code·class="inline">#{binary()·=&gt;·_}</code></td><td·style="text-align:·left;">Object</td></tr><tr><td·style="text-align:·left;"><code·class="inline">#{atom()·=&gt;·_}</code></td><td·style="text-align:·left;">Object</td></tr><tr><td·style="text-align:·left;"><code·class="inline">#{integer()·=&gt;·_}</code></td><td·style="text-align:·left;">Object</td></tr></tbody></table><p>This·is·equivalent·to·<code·class="inline">encode(Term,·fun·json:encode_value/2)</code>.</p><h2·id="encode/1-examples"·class="section-heading">
1132 ··<a·href="#encode/1-examples"·class="hover-link">1132 ··<a·href="#encode/1-examples"·class="hover-link">
1133 ····<i·class="ri-link-m"·aria-hidden="true"></i>1133 ····<i·class="ri-link-m"·aria-hidden="true"></i>
1134 ··</a>1134 ··</a>
1135 ··<span·class="text">Examples</span>1135 ··<span·class="text">Examples</span>
1136 </h2>1136 </h2>
1137 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">iolist_to_binary</span><span·class="p"·data-group-id="2221898747-1">(</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">encode</span><span·class="p"·data-group-id="2221898747-2">(</span><span·class="p"·data-group-id="2221898747-3">#{</span><span·class="ss">foo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="2221898747-4">&lt;&lt;</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="2221898747-4">&gt;&gt;</span><span·class="p"·data-group-id="2221898747-3">}</span><span·class="p"·data-group-id="2221898747-2">)</span><span·class="p"·data-group-id="2221898747-1">)</span><span·class="p">.</span><span·class="w"> 
1138 </span><span·class="p"·data-group-id="2221898747-5">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:\&quot;bar\&quot;}&quot;</span><span·class="p"·data-group-id="2221898747-5">&gt;&gt;</span></code></pre>1137 <pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">iolist_to_binary</span><span·class="p"·data-group-id="1435632217-1">(</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">encod[·...·truncated·by·diffoscope;·len:·574,·SHA:·a7161d31db7c06e7c1fa21f924aca23c63d3f8ea69e6b8d1194f11c03e6f4073·...·]>
 1138 </span><span·class="p"·data-group-id="1435632217-5">&lt;&lt;</span><span·class="s">&quot;{\&quot;foo\&quot;:\&quot;bar\&quot;}&quot;</span><span·class="p"·data-group-id="1435632217-5">&gt;&gt;</span></code></pre>
1139 ··</section>1139 ··</section>
1140 </section>1140 </section>
1141 <section·class="detail"·id="encode/2">1141 <section·class="detail"·id="encode/2">
  
1142 ··<div·class="detail-header">1142 ··<div·class="detail-header">
1143 ····<a·href="#encode/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1143 ····<a·href="#encode/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1144 ······<i·class="ri-link-m"·aria-hidden="true"></i>1144 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1171 to·help·in·constructing·such·callbacks.</p><h2·id="encode/2-examples"·class="section-heading">1171 to·help·in·constructing·such·callbacks.</p><h2·id="encode/2-examples"·class="section-heading">
1172 ··<a·href="#encode/2-examples"·class="hover-link">1172 ··<a·href="#encode/2-examples"·class="hover-link">
1173 ····<i·class="ri-link-m"·aria-hidden="true"></i>1173 ····<i·class="ri-link-m"·aria-hidden="true"></i>
1174 ··</a>1174 ··</a>
1175 ··<span·class="text">Examples</span>1175 ··<span·class="text">Examples</span>
1176 </h2>1176 </h2>
1177 <p>An·encoder·that·uses·a·heuristic·to·differentiate·object-like1177 <p>An·encoder·that·uses·a·heuristic·to·differentiate·object-like
1178 lists·of·key-value·pairs·from·plain·lists:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">encoder</span><span·class="p"·data-group-id="8104481777-1">(</span><span·class="p"·data-group-id="8104481777-2">[</span><span·class="p"·data-group-id="8104481777-3">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="81[·...·truncated·by·diffoscope;·len:·770,·SHA:·1ba7b1a3494cd830e612878476d47e66b7d27557af6e33d3b51eaca8891133e8·...·]7-4">)</span><span·class="p">;</span><span·class="gp·unselectable">1178 lists·of·key-value·pairs·from·plain·lists:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">encoder</span><span·class="p"·data-group-id="8650025907-1">(</span><span·class="p"·data-group-id="8650025907-2">[</span><span·class="p"·data-group-id="8650025907-3">{</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="86[·...·truncated·by·diffoscope;·len:·770,·SHA:·5d3f7b4d15e2d80ad818452ed59910405b82a7d3b1cf04bf0b9003e9b143d922·...·]7-4">)</span><span·class="p">;</span><span·class="gp·unselectable">
1179 &gt;·</span><span·class="nf">encoder</span><span·class="p"·data-group-id="8104481777-5">(</span><span·class="n">Other</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Encode</span><span·class="p"·data-group-id="8104481777-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·285,·SHA:·2ce896f0e01094c7623d40b4bd3c45e738b6fbcccc3c922e9b38ee44086a30c0·...·]7-6">)</span><span·class="p">.</span><span·class="gp·unselectable">1179 &gt;·</span><span·class="nf">encoder</span><span·class="p"·data-group-id="8650025907-5">(</span><span·class="n">Other</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Encode</span><span·class="p"·data-group-id="8650025907-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·285,·SHA:·4c530e0f15ada008637f97b3f2c2c33ec80f39048888aed6564a39263d41bd34·...·]7-6">)</span><span·class="p">.</span><span·class="gp·unselectable">
1180 &gt;·</span><span·class="nf">custom_encode</span><span·class="p"·data-group-id="8104481777-7">(</span><span·class="n">Value</span><span·class="p"·data-group-id="8104481777-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">encode</s[·...·truncated·by·diffoscope;·len:·781,·SHA:·5c177026699e5bf3c711c50390f9686d1aac7d0a4684deb05f13736c0352a8e0·...·]7-8">)</span><span·class="p">.</span><span·class="gp·unselectable">1180 &gt;·</span><span·class="nf">custom_encode</span><span·class="p"·data-group-id="8650025907-7">(</span><span·class="n">Value</span><span·class="p"·data-group-id="8650025907-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">encode</s[·...·truncated·by·diffoscope;·len:·781,·SHA:·af1b5ba147d01b9ea2037dab9fa83d1f98b479b8217c013ac8b42733ef535c86·...·]7-8">)</span><span·class="p">.</span><span·class="gp·unselectable">
1181 &gt;·</span><span·class="nf">iolist_to_binary</span><span·class="p"·data-group-id="8104481777-11">(</span><span·class="nf">custom_encode</span><span·class="p"·data-group-id="8104481777-12">(</span><span·class="p"·data-group-id="8104481777-13">[</span><span·class="p"·data-group-id="8104481777-14">{</span><span·class="ss">a</span><span·clas[·...·truncated·by·diffoscope;·len:·602,·SHA:·2db598f004954a7d18c6e238acfed768bf6ea72051fc27920f17ad5b48985adb·...·]7-11">)</span><span·class="p">.</span><span·class="w">1181 &gt;·</span><span·class="nf">iolist_to_binary</span><span·class="p"·data-group-id="8650025907-11">(</span><span·class="nf">custom_encode</span><span·class="p"·data-group-id="8650025907-12">(</span><span·class="p"·data-group-id="8650025907-13">[</span><span·class="p"·data-group-id="8650025907-14">{</span><span·class="ss">a</span><span·clas[·...·truncated·by·diffoscope;·len:·602,·SHA:·e09d54d0d871ea049bbc1e7f67b60b10a232a71e2e68afe452a71974efe939c6·...·]7-11">)</span><span·class="p">.</span><span·class="w">
1182 </span><span·class="p"·data-group-id="8104481777-17">&lt;&lt;</span><span·class="s">&quot;{\&quot;a\&quot;:[],\&quot;b\&quot;:1}&quot;</span><span·class="p"·data-group-id="8104481777-17">&gt;&gt;</span></code></pre>1182 </span><span·class="p"·data-group-id="8650025907-17">&lt;&lt;</span><span·class="s">&quot;{\&quot;a\&quot;:[],\&quot;b\&quot;:1}&quot;</span><span·class="p"·data-group-id="8650025907-17">&gt;&gt;</span></code></pre>
1183 ··</section>1183 ··</section>
1184 </section>1184 </section>
1185 <section·class="detail"·id="encode_atom/2">1185 <section·class="detail"·id="encode_atom/2">
  
1186 ··<div·class="detail-header">1186 ··<div·class="detail-header">
1187 ····<a·href="#encode_atom/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1187 ····<a·href="#encode_atom/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1188 ······<i·class="ri-link-m"·aria-hidden="true"></i>1188 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1542 ······<div·class="specs">1542 ······<div·class="specs">
  
1543 ··········<pre·translate="no"><span·class="attribute">-spec</span>·format(Term·::·<a·href="#t:encode_value/0">encode_value</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:iodata/0">iodata</a>().</pre>1543 ··········<pre·translate="no"><span·class="attribute">-spec</span>·format(Term·::·<a·href="#t:encode_value/0">encode_value</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:iodata/0">iodata</a>().</pre>
  
1544 ······</div>1544 ······</div>
  
1545 <p>Generates·formatted·JSON·corresponding·to·<code·class="inline">Term</code>.</p><p>Similiar·to·<a·href="#encode/1"><code·class="inline">encode/1</code></a>·but·with·added·whitespaces·for·formatting.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="2753166609-1">(</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="2753166609-2">(</span><span·class="p"·data-group-id="2753166609-3">#{</span><span·class="ss">foo</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·540,·SHA:·83db9fd46ae633f5e628136b65be89f9ee0b8c228938c8cbf0b3d63bba3b11ab·...·]-1">)</span><span·class="p">.</span><span·class="w">1545 <p>Generates·formatted·JSON·corresponding·to·<code·class="inline">Term</code>.</p><p>Similiar·to·<a·href="#encode/1"><code·class="inline">encode/1</code></a>·but·with·added·whitespaces·for·formatting.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">put_chars</span><span·class="p"·data-group-id="8943279484-1">(</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8943279484-2">(</span><span·class="p"·data-group-id="8943279484-3">#{</span><span·class="ss">foo</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·540,·SHA:·12a497f3576f5a4b019cab01a6c785137a3d098a8e1ec758935ea4fedee1062d·...·]-1">)</span><span·class="p">.</span><span·class="w">
1546 </span><span·class="p"·data-group-id="2753166609-5">{</span><span·class="w">1546 </span><span·class="p"·data-group-id="8943279484-5">{</span><span·class="w">
1547 ··</span><span·class="s">&quot;baz&quot;</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">52</span><span·class="p">,</span><span·class="w">1547 ··</span><span·class="s">&quot;baz&quot;</span><span·class="p">:</span><span·class="w">·</span><span·class="mi">52</span><span·class="p">,</span><span·class="w">
1548 ··</span><span·class="s">&quot;foo&quot;</span><span·class="p">:</span><span·class="w">·</span><span·class="s">&quot;bar&quot;</span><span·class="w">1548 ··</span><span·class="s">&quot;foo&quot;</span><span·class="p">:</span><span·class="w">·</span><span·class="s">&quot;bar&quot;</span><span·class="w">
1549 </span><span·class="p"·data-group-id="2753166609-5">}</span><span·class="w">1549 </span><span·class="p"·data-group-id="8943279484-5">}</span><span·class="w">
1550 </span><span·class="ss">ok</span></code></pre>1550 </span><span·class="ss">ok</span></code></pre>
1551 ··</section>1551 ··</section>
1552 </section>1552 </section>
1553 <section·class="detail"·id="format/2">1553 <section·class="detail"·id="format/2">
  
1554 ··<div·class="detail-header">1554 ··<div·class="detail-header">
1555 ····<a·href="#format/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1555 ····<a·href="#format/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1607, 28 lines modifiedOffset 1607, 28 lines modified
1607 ··········<pre·translate="no"><span·class="attribute">-spec</span>·format(Term·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:dynamic/0">dynamic</a>(),·Encoder·::·<a·href="#t:formatter/0">formatter</a>(),·Options·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:map/0">map</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:iodata/0">iodata</a>().</pre>1607 ··········<pre·translate="no"><span·class="attribute">-spec</span>·format(Term·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:dynamic/0">dynamic</a>(),·Encoder·::·<a·href="#t:formatter/0">formatter</a>(),·Options·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:map/0">map</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:iodata/0">iodata</a>().</pre>
  
1608 ······</div>1608 ······</div>
  
1609 <p>Generates·formatted·JSON·corresponding·to·<code·class="inline">Term</code>.</p><p>Similar·to·<a·href="#encode/2"><code·class="inline">encode/2</code></a>,·can·be·customised·with·the·<code·class="inline">Encoder</code>·callback·and·<code·class="inline">Options</code>.</p><p><code·class="inline">Options</code>·can·include·'indent'·to·specify·number·of·spaces·per·level·and·'max'·which·loosely·limits1609 <p>Generates·formatted·JSON·corresponding·to·<code·class="inline">Term</code>.</p><p>Similar·to·<a·href="#encode/2"><code·class="inline">encode/2</code></a>,·can·be·customised·with·the·<code·class="inline">Encoder</code>·callback·and·<code·class="inline">Options</code>.</p><p><code·class="inline">Options</code>·can·include·'indent'·to·specify·number·of·spaces·per·level·and·'max'·which·loosely·limits
1610 the·width·of·lists.</p><p>The·<code·class="inline">Encoder</code>·will·get·a·'State'·argument·which·contains·the·'Options'·maps·merged·with·other·data1610 the·width·of·lists.</p><p>The·<code·class="inline">Encoder</code>·will·get·a·'State'·argument·which·contains·the·'Options'·maps·merged·with·other·data
1611 when·recursing·through·'Term'.</p><p><a·href="#format_value/3"><code·class="inline">format_value/3</code></a>·or·various·<code·class="inline">encode_*</code>·functions·in·this·module·can·be·used1611 when·recursing·through·'Term'.</p><p><a·href="#format_value/3"><code·class="inline">format_value/3</code></a>·or·various·<code·class="inline">encode_*</code>·functions·in·this·module·can·be·used
1612 to·help·in·constructing·such·callbacks.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">formatter</span><span·class="p"·data-group-id="3483935042-1">(</span><span·class="p"·data-group-id="3483935042-2">{</span><span·class="ss">posix_time</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SysTimeSecs</span><span·class="p"·data-group-id="3483935042-2">}</span><span·class=[·...·truncated·by·diffoscope;·len:·182,·SHA:·9426a31584751e419cd9fa0746375faf9370c7ae1f923728c4c7e0aaa8275aa0·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1612 to·help·in·constructing·such·callbacks.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">formatter</span><span·class="p"·data-group-id="1994947966-1">(</span><span·class="p"·data-group-id="1994947966-2">{</span><span·class="ss">posix_time</span><span·class="p">,</span><span·class="w">·</span><span·class="n">SysTimeSecs</span><span·class="p"·data-group-id="1994947966-2">}</span><span·class=[·...·truncated·by·diffoscope;·len:·182,·SHA:·8ff3724ff5436954247fd1d0d59d59ea9731968f1d8e51d63d8784b15be25609·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1613 ····</span><span·class="n">TimeStr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="3483935042-3">(</span><span·class="n">SysTimeSecs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3483935042-4">[</span><span·class="p"·data-group-id="3483935042-5">{</span><span·class="ss">offset</span><span·class="p">[·...·truncated·by·diffoscope;·len:·215,·SHA:·9c46dfb5b71fa78d6a92167ada2bea54f91506d2efea5a4530984faa513af46f·...·]-3">)</span><span·class="p">,</span><span·class="w">1613 ····</span><span·class="n">TimeStr</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">system_time_to_rfc3339</span><span·class="p"·data-group-id="1994947966-3">(</span><span·class="n">SysTimeSecs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1994947966-4">[</span><span·class="p"·data-group-id="1994947966-5">{</span><span·class="ss">offset</span><span·class="p">[·...·truncated·by·diffoscope;·len:·215,·SHA:·19fd232999287809778f53db3805601c961641c895aec7166df4f69836da12a5·...·]-3">)</span><span·class="p">,</span><span·class="w">
1614 ····</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">format_value</span><span·class="p"·data-group-id="3483935042-6">(</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_binary</span><span·class="p"·data-group-id="3483935042-7">(</span><span·class="n">TimeStr</span><span·class="p"·data-group-id="3483935042-7">)</span[·...·truncated·by·diffoscope;·len:·195,·SHA:·b91f273b894a56cb599679070b7ba1052feb9fe6382c4a1d992ee510aaf18c48·...·]-6">)</span><span·class="p">;</span><span·class="gp·unselectable">1614 ····</span><span·class="nc">json</span><span·class="p">:</span><span·class="nf">format_value</span><span·class="p"·data-group-id="1994947966-6">(</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_binary</span><span·class="p"·data-group-id="1994947966-7">(</span><span·class="n">TimeStr</span><span·class="p"·data-group-id="1994947966-7">)</span[·...·truncated·by·diffoscope;·len:·195,·SHA:·7972346ff1b68332bdbe28b2ad28df0b31363b6418820a2bbbd6a45f66bd23a4·...·]-6">)</span><span·class="p">;</span><span·class="gp·unselectable">
1615 &gt;·</span><span·class="nf">formatter</span><span·class="p"·data-group-id="3483935042-8">(</span><span·class="n">Other</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Encode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="3483935042-8">)</span>[·...·truncated·by·diffoscope;·len:·439,·SHA:·a190908576de65a8ab34818e04039ec51a07b4ab4fd26ce59b33b13b52a6702f·...·]-9">)</span><span·class="p">.</span><span·class="w">1615 &gt;·</span><span·class="nf">formatter</span><span·class="p"·data-group-id="1994947966-8">(</span><span·class="n">Other</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Encode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="1994947966-8">)</span>[·...·truncated·by·diffoscope;·len:·439,·SHA:·03073e0843c4d4a24f1f3fb9c9944e0d382f864cf6008198e605effe4eabbff8·...·]-9">)</span><span·class="p">.</span><span·class="w">
1616 </span><span·class="o">&gt;</span><span·class="gp·unselectable">1616 </span><span·class="o">&gt;</span><span·class="gp·unselectable">
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Offset 1157, 16 lines modifiedOffset 1157, 16 lines modified
  
1157 ······<div·class="specs">1157 ······<div·class="specs">
  
1158 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append(ListOfLists)·->·List1·when·ListOfLists·::·[List],·List·::·[T],·List1·::·[T],·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1158 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append(ListOfLists)·->·List1·when·ListOfLists·::·[List],·List·::·[T],·List1·::·[T],·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1159 ······</div>1159 ······</div>
  
1160 <p>Returns·a·list·in·which·all·the·sublists·of·<code·class="inline">ListOfLists</code>·have·been·appended.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="4434244967-1">(</span><span·class="p"·data-group-id="4434244967-2">[</span><span·class="p"·data-group-id="4434244967-3">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·767,·SHA:·366c0d81e666e12a39f647a02cb59e8e8e0a75163e403ada8265ba104058e476·...·]-1">)</span><span·class="p">.</span><span·class="w">1160 <p>Returns·a·list·in·which·all·the·sublists·of·<code·class="inline">ListOfLists</code>·have·been·appended.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="8727646582-1">(</span><span·class="p"·data-group-id="8727646582-2">[</span><span·class="p"·data-group-id="8727646582-3">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·767,·SHA:·979ed5f2a72618f725a896a0f1fcef0ca35de2c4803c344d47076f61d9eae577·...·]-1">)</span><span·class="p">.</span><span·class="w">
1161 </span><span·class="p"·data-group-id="4434244967-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="[·...·truncated·by·diffoscope;·len:·175,·SHA:·30433037955ae47226042d4d32f2fffea4addabb38cd6502a2b7d09dc24b8060·...·]-6">]</span></code></pre>1161 </span><span·class="p"·data-group-id="8727646582-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="[·...·truncated·by·diffoscope;·len:·175,·SHA:·643d45f9df051017533d546759afee7ecbde7020ad9755f9b03e70493380bd00·...·]-6">]</span></code></pre>
1162 ··</section>1162 ··</section>
1163 </section>1163 </section>
1164 <section·class="detail"·id="append/2">1164 <section·class="detail"·id="append/2">
  
1165 ··<div·class="detail-header">1165 ··<div·class="detail-header">
1166 ····<a·href="#append/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1166 ····<a·href="#append/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1167 ······<i·class="ri-link-m"·aria-hidden="true"></i>1167 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1185, 15 lines modifiedOffset 1185, 15 lines modified
1185 ······<div·class="specs">1185 ······<div·class="specs">
  
1186 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append(List1,·List2)·->·List3·when·List1·::·[T],·List2·::·[T],·List3·::·[T],·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1186 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append(List1,·List2)·->·List3·when·List1·::·[T],·List2·::·[T],·List3·::·[T],·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1187 ······</div>1187 ······</div>
  
1188 <p>Returns·a·new·list·<code·class="inline">List3</code>,·which·is·made·from·the·elements·of·<code·class="inline">List1</code>·followed1188 <p>Returns·a·new·list·<code·class="inline">List3</code>,·which·is·made·from·the·elements·of·<code·class="inline">List1</code>·followed
1189 by·the·elements·of·<code·class="inline">List2</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="8965372002-1">(</span><span·class="s">&quot;abc&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;def&quot;</span><span·class="p"·data-group-id="8965372002-1">)</span><span·class="p">.</span><span·class="w">1189 by·the·elements·of·<code·class="inline">List2</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="2018895783-1">(</span><span·class="s">&quot;abc&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;def&quot;</span><span·class="p"·data-group-id="2018895783-1">)</span><span·class="p">.</span><span·class="w">
1190 </span><span·class="s">&quot;abcdef&quot;</span></code></pre><p><code·class="inline">lists:append(A,·B)</code>·is·equivalent·to·<code·class="inline">A·++·B</code>.</p>1190 </span><span·class="s">&quot;abcdef&quot;</span></code></pre><p><code·class="inline">lists:append(A,·B)</code>·is·equivalent·to·<code·class="inline">A·++·B</code>.</p>
1191 ··</section>1191 ··</section>
1192 </section>1192 </section>
1193 <section·class="detail"·id="concat/1">1193 <section·class="detail"·id="concat/1">
  
1194 ··<div·class="detail-header">1194 ··<div·class="detail-header">
1195 ····<a·href="#concat/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1195 ····<a·href="#concat/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1214, 15 lines modifiedOffset 1214, 15 lines modified
  
1214 ··········<pre·translate="no"><span·class="attribute">-spec</span>·concat(Things)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()1214 ··········<pre·translate="no"><span·class="attribute">-spec</span>·concat(Things)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>()
1215 ················when·Things·::·[Thing],·Thing·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:float/0">float</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>().</pre>1215 ················when·Things·::·[Thing],·Thing·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:atom/0">atom</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:float/0">float</a>()·|·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:string/0">string</a>().</pre>
  
1216 ······</div>1216 ······</div>
  
1217 <p>Concatenates·the·text·representation·of·the·elements·of·<code·class="inline">Things</code>.·The·elements1217 <p>Concatenates·the·text·representation·of·the·elements·of·<code·class="inline">Things</code>.·The·elements
1218 of·<code·class="inline">Things</code>·can·be·atoms,·integers,·floats,·or·strings.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">concat</span><span·class="p"·data-group-id="9997698967-1">(</span><span·class="p"·data-group-id="9997698967-2">[</span><span·class="ss">doc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;/&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file</[·...·truncated·by·diffoscope;·len:·255,·SHA:·075e33bf1fc6bb8e0635d972c9a403561679466a4ac1ef7314d814ca45c21546·...·]-1">)</span><span·class="p">.</span><span·class="w">1218 of·<code·class="inline">Things</code>·can·be·atoms,·integers,·floats,·or·strings.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">concat</span><span·class="p"·data-group-id="4437478262-1">(</span><span·class="p"·data-group-id="4437478262-2">[</span><span·class="ss">doc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;/&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file</[·...·truncated·by·diffoscope;·len:·255,·SHA:·1e32edd10d57060dc3c55839f08c5d0412ac36178fdac36058c0fc9612ed94fb·...·]-1">)</span><span·class="p">.</span><span·class="w">
1219 </span><span·class="s">&quot;doc/file.3&quot;</span></code></pre>1219 </span><span·class="s">&quot;doc/file.3&quot;</span></code></pre>
1220 ··</section>1220 ··</section>
1221 </section>1221 </section>
1222 <section·class="detail"·id="delete/2">1222 <section·class="detail"·id="delete/2">
  
1223 ··<div·class="detail-header">1223 ··<div·class="detail-header">
1224 ····<a·href="#delete/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1224 ····<a·href="#delete/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1325, 16 lines modifiedOffset 1325, 16 lines modified
  
1325 ······<div·class="specs">1325 ······<div·class="specs">
  
1326 ··········<pre·translate="no"><span·class="attribute">-spec</span>·duplicate(N,·Elem)·->·List·when·N·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·Elem·::·T,·List·::·[T],·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1326 ··········<pre·translate="no"><span·class="attribute">-spec</span>·duplicate(N,·Elem)·->·List·when·N·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>(),·Elem·::·T,·List·::·[T],·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1327 ······</div>1327 ······</div>
  
1328 <p>Returns·a·list·containing·<code·class="inline">N</code>·copies·of·term·<code·class="inline">Elem</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">duplicate</span><span·class="p"·data-group-id="9257223922-1">(</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">xx</span><span·class="p"·data-group-id="9257223922-1">)</span><span·class="p">.</span><span·class="w">1328 <p>Returns·a·list·containing·<code·class="inline">N</code>·copies·of·term·<code·class="inline">Elem</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">duplicate</span><span·class="p"·data-group-id="0813619942-1">(</span><span·class="mi">5</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">xx</span><span·class="p"·data-group-id="0813619942-1">)</span><span·class="p">.</span><span·class="w">
1329 </span><span·class="p"·data-group-id="9257223922-2">[</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·1a2342606a01cf0af3d1ec47363f6352a332135b9de38eaad344234497b230b6·...·]2-2">]</span></code></pre>1329 </span><span·class="p"·data-group-id="0813619942-2">[</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·class="p">,</span><span·class="ss">xx</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·226a0c113b1432e67a0bf771fdbc89c1ad586aab3068ffb2d8d2a3d151319227·...·]2-2">]</span></code></pre>
1330 ··</section>1330 ··</section>
1331 </section>1331 </section>
1332 <section·class="detail"·id="enumerate/1">1332 <section·class="detail"·id="enumerate/1">
  
1333 ··<div·class="detail-header">1333 ··<div·class="detail-header">
1334 ····<a·href="#enumerate/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1334 ····<a·href="#enumerate/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1335 ······<i·class="ri-link-m"·aria-hidden="true"></i>1335 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1421, 20 lines modifiedOffset 1421, 20 lines modified
1421 ·······················T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1421 ·······················T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1422 ······</div>1422 ······</div>
  
1423 <p>Returns·<code·class="inline">List1</code>·with·each·element·<code·class="inline">H</code>·replaced·by·a·tuple·of·form·<code·class="inline">{I,·H}</code>·where1423 <p>Returns·<code·class="inline">List1</code>·with·each·element·<code·class="inline">H</code>·replaced·by·a·tuple·of·form·<code·class="inline">{I,·H}</code>·where
1424 <code·class="inline">I</code>·is·the·position·of·<code·class="inline">H</code>·in·<code·class="inline">List1</code>.·The·enumeration·starts·with·<code·class="inline">Index</code>·and1424 <code·class="inline">I</code>·is·the·position·of·<code·class="inline">H</code>·in·<code·class="inline">List1</code>.·The·enumeration·starts·with·<code·class="inline">Index</code>·and
1425 increases·by·<code·class="inline">Step</code>·in·each·step.</p><p>That·is,·<a·href="#enumerate/3"><code·class="inline">enumerate/3</code></a>·behaves·as·if·it·had·been·defined·as1425 increases·by·<code·class="inline">Step</code>·in·each·step.</p><p>That·is,·<a·href="#enumerate/3"><code·class="inline">enumerate/3</code></a>·behaves·as·if·it·had·been·defined·as
1426 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">enumerate</span><span·class="p"·data-group-id="6650088211-1">(</span><span·class="n">I</span><span·class="p">,</span><span·class="w">·</span><span·class="n">S</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List</span><span·class="p"·data-group-id="6650088211-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1426 follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">enumerate</span><span·class="p"·data-group-id="6730920281-1">(</span><span·class="n">I</span><span·class="p">,</span><span·class="w">·</span><span·class="n">S</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List</span><span·class="p"·data-group-id="6730920281-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1427 ··</span><span·class="p"·data-group-id="6650088211-2">{</span><span·class="n">List1</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</span><span·class="p"·data-group-id="6650088211-2">}</span><span·class="w">·</span><span·class="o">=</span><span·clas[·...·truncated·by·diffoscope;·len:·1128,·SHA:·164a9089d9ccccf8d40b65a96335e04cf4209ab756027ab2deb5e419d9b36ed6·...·]1-3">)</span><span·class="p">,</span><span·class="w">1427 ··</span><span·class="p"·data-group-id="6730920281-2">{</span><span·class="n">List1</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</span><span·class="p"·data-group-id="6730920281-2">}</span><span·class="w">·</span><span·class="o">=</span><span·clas[·...·truncated·by·diffoscope;·len:·1128,·SHA:·e4a6bfee7e0845c9b35c4864fc83ccc89fcee9f00585f55691e93b89b09881b2·...·]1-3">)</span><span·class="p">,</span><span·class="w">
1428 ··</span><span·class="n">List1</span><span·class="p">.</span></code></pre><p>The·default·values·for·<code·class="inline">Index</code>·and·<code·class="inline">Step</code>·are·both·<code·class="inline">1</code>.</p><p><em>Examples:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">enumerate</span><span·class="p"·data-group-id="2494463289-1">(</span><span·class="p"·data-group-id="2494463289-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="2494463289-2">]</span><span·class="p"·data-group-id="2494463289-1">)</span><span·class="p">.</span><span·class="w"> 
1429 </span><span·class="p"·data-group-id="2494463289-3">[</span><span·class="p"·data-group-id="2494463289-4">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="2494463289-4">}</span><span·class="p">,</span><span·class="p"·data-group-id="2494463289-5">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="2494463289-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="2494463289-6">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="2494463289-6">}</span><span·class="p"·data-group-id="2494463289-3">]</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">enumerate</span><span·class="p"·data-group-id="9957389494-1">(</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9957389494-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="9957389494-2">]</span><span·class="p"·data-group-id="9957389494-1">)</span><span·class="p">.</span><span·class="w"> 
1430 </span><span·class="p"·data-group-id="9957389494-3">[</span><span·class="p"·data-group-id="9957389494-4">{</span><span·class="mi">10</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="9957389494-4">}</span><span·class="p">,</span><span·class="p"·data-group-id="9957389494-5">{</span><span·class="mi">11</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="9957389494-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="9957389494-6">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="9957389494-6">}</span><span·class="p"·data-group-id="9957389494-3">]</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">enumerate</span><span·class="p"·data-group-id="8243221021-1">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8243221021-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="8243221021-2">]</span><span·class="p"·data-group-id="8243221021-1">)</span><span·class="p">.</span><span·class="w"> 
1431 </span><span·class="p"·data-group-id="8243221021-3">[</span><span·class="p"·data-group-id="8243221021-4">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="8243221021-4">}</span><span·class="p">[·...·truncated·by·diffoscope;·len:·505,·SHA:·a844918b43a69045c4e60036ba8e024a0619668bde96374922b8a4e35e19fd61·...·]>1428 ··</span><span·class="n">List1</span><span·class="p">.</span></code></pre><p>The·default·values·for·<code·class="inline">Index</code>·and·<code·class="inline">Step</code>·are·both·<code·class="inline">1</code>.</p><p><em>Examples:</em></p><pre><code·class=[·...·truncated·by·diffoscope;·len:·533,·SHA:·983a937883d479ee0cd7f9183fcaeac046b37792cc23f716da35cd2b49d56f35·...·]>
 1429 </span><span·class="p"·data-group-id="2619227437-3">[</span><span·class="p"·data-group-id="2619227437-4">{</span><span·class="mi">1</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="2619227437-4">}</span><span·class="p">,</span><span·class="p"·data-group-id="2619227437-5">{</span><span·class="mi">2</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="2619227437-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="2619227437-6">{</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="2619227437-6">}</span><span·class="p"·data-group-id="2619227437-3">]</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">enumerate</span><span·class="p"·data-group-id="2102584467-1">(</span><span·class="mi">10</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2102584467-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="2102584467-2">]</span><span·class="p"·data-group-id="2102584467-1">)</span><span·class="p">.</span><span·class="w">
 1430 </span><span·class="p"·data-group-id="2102584467-3">[</span><span·class="p"·data-group-id="2102584467-4">{</span><span·class="mi">10</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="2102584467-4">}</span><span·class="p">,</span><span·class="p"·data-group-id="2102584467-5">{</span><span·class="mi">11</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="2102584467-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="2102584467-6">{</span><span·class="mi">12</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="2102584467-6">}</span><span·class="p"·data-group-id="2102584467-3">]</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">enumerate</span><span·class="p"·data-group-id="8754688354-1">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="o">-</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8754688354-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="8754688354-2">]</span><span·class="p"·data-group-id="8754688354-1">)</span><span·class="p">.</span><span·class="w">
 1431 </span><span·class="p"·data-group-id="8754688354-3">[</span><span·class="p"·data-group-id="8754688354-4">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">a</span><span·class="p"·data-group-id="8754688354-4">}</span><span·class="p">,</span><span·class="p"·data-group-id="8754688354-5">{</span><span·class="o">-</span><span·class="mi">2</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="8754688354-5">}</span><span·class="p">,</span><span·class="p"·data-group-id="8754688354-6">{</span><span·class="o">-</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">c</span><span·class="p"·data-group-id="8754688354-6">}</span><span·class="p"·data-group-id="8754688354-3">]</span></code></pre>
1432 ··</section>1432 ··</section>
1433 </section>1433 </section>
1434 <section·class="detail"·id="filter/2">1434 <section·class="detail"·id="filter/2">
  
1435 ··<div·class="detail-header">1435 ··<div·class="detail-header">
1436 ····<a·href="#filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1436 ····<a·href="#filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1437 ······<i·class="ri-link-m"·aria-hidden="true"></i>1437 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1491, 23 lines modifiedOffset 1491, 23 lines modified
1491 ·······················Value·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1491 ·······················Value·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1492 ······</div>1492 ······</div>
  
1493 <p>Calls·<code·class="inline">Fun(Elem)</code>·on·successive·elements·<code·class="inline">Elem</code>·of·<code·class="inline">List1</code>·in·order·to·update·or1493 <p>Calls·<code·class="inline">Fun(Elem)</code>·on·successive·elements·<code·class="inline">Elem</code>·of·<code·class="inline">List1</code>·in·order·to·update·or
1494 remove·elements·from·<code·class="inline">List1</code>.</p><p><code·class="inline">Fun/1</code>·must·return·either·a·Boolean·or·a·tuple·<code·class="inline">{true,·Value}</code>.·The·function1494 remove·elements·from·<code·class="inline">List1</code>.</p><p><code·class="inline">Fun/1</code>·must·return·either·a·Boolean·or·a·tuple·<code·class="inline">{true,·Value}</code>.·The·function
1495 returns·the·list·of·elements·for·which·<code·class="inline">Fun</code>·returns·a·new·value,·where·a·value1495 returns·the·list·of·elements·for·which·<code·class="inline">Fun</code>·returns·a·new·value,·where·a·value
1496 of·<code·class="inline">true</code>·is·synonymous·with·<code·class="inline">{true,·Elem}</code>.</p><p>That·is,·<code·class="inline">filtermap</code>·behaves·as·if·it·had·been·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">filtermap</span><span·class="p"·data-group-id="7766773380-1">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="7766773380-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1496 of·<code·class="inline">true</code>·is·synonymous·with·<code·class="inline">{true,·Elem}</code>.</p><p>That·is,·<code·class="inline">filtermap</code>·behaves·as·if·it·had·been·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">filtermap</span><span·class="p"·data-group-id="3687775767-1">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="3687775767-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1497 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7766773380-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7766773380-3">(</span><span·class="n">Elem</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="7766773380-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1497 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="3687775767-2">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3687775767-3">(</span><span·class="n">Elem</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p"·data-group-id="3687775767-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1498 ·······················</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p"·data-group-id="7766773380-4">(</span><span·class="n">Elem</span><span·class="p"·data-group-id="7766773380-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">1498 ·······················</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Fun</span><span·class="p"·data-group-id="3687775767-4">(</span><span·class="n">Elem</span><span·class="p"·data-group-id="3687775767-4">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
1499 ···························</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">;</span><span·class="w">1499 ···························</span><span·class="ss">false</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">;</span><span·class="w">
1500 ···························</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7766773380-5">[</span><span·class="n">Elem</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="7766773380-5">]</span><span·class="p">;</span><span·class="w">1500 ···························</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3687775767-5">[</span><span·class="n">Elem</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="3687775767-5">]</span><span·class="p">;</span><span·class="w">
1501 ···························</span><span·class="p"·data-group-id="7766773380-6">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="7766773380-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·147,·SHA:·c179a8aa3ad93239657b29a2eabb9a1c012175b541f01f34baed1bdcb6d3c642·...·]-7">]</span><span·class="w">1501 ···························</span><span·class="p"·data-group-id="3687775767-6">{</span><span·class="ss">true</span><span·class="p">,</span><span·class="n">Value</span><span·class="p"·data-group-id="3687775767-6">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·147,·SHA:·52bed48ddbc840f0f1ccf92ccfa5f4b45fcad0f2d9da513f534ffe868d499da1·...·]-7">]</span><span·class="w">
1502 ·······················</span><span·class="k">end</span><span·class="w">1502 ·······················</span><span·class="k">end</span><span·class="w">
1503 ················</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7766773380-8">[</span><span·class="p"·data-group-id="7766773380-8">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="7766773380-2">)</span><span·class="p">.</span></code></pre><p><em>Example:[·...·truncated·by·diffoscope;·len:·1819,·SHA:·a692fb3a4f636c77007d767317252e026f0baa78cae996779bd0e4416b9a001e·...·]-1">)</span><span·class="p">.</span><span·class="w">1503 ················</span><span·class="k">end</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3687775767-8">[</span><span·class="p"·data-group-id="3687775767-8">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="3687775767-2">)</span><span·class="p">.</span></code></pre><p><em>Example:[·...·truncated·by·diffoscope;·len:·1819,·SHA:·b7441d7924dcf48ca057c3f1c403d64eaf5770d43e7331141f2b723f7eb99e4e·...·]-1">)</span><span·class="p">.</span><span·class="w">
1504 </span><span·class="p"·data-group-id="6188209049-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6188209049-5">]</span></code></pre>1504 </span><span·class="p"·data-group-id="4065278341-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="4065278341-5">]</span></code></pre>
1505 ··</section>1505 ··</section>
1506 </section>1506 </section>
1507 <section·class="detail"·id="flatlength/1">1507 <section·class="detail"·id="flatlength/1">
  
1508 ··<div·class="detail-header">1508 ··<div·class="detail-header">
1509 ····<a·href="#flatlength/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1509 ····<a·href="#flatlength/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1510 ······<i·class="ri-link-m"·aria-hidden="true"></i>1510 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1554 ··········<pre·translate="no"><span·class="attribute">-spec</span>·flatmap(Fun,·List1)·->·List21554 ··········<pre·translate="no"><span·class="attribute">-spec</span>·flatmap(Fun,·List1)·->·List2
1555 ·················when·Fun·::·fun((A)·->·[B]),·List1·::·[A],·List2·::·[B],·A·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·B·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>1555 ·················when·Fun·::·fun((A)·->·[B]),·List1·::·[A],·List2·::·[B],·A·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·B·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
1556 ······</div>1556 ······</div>
  
1557 <p>Takes·a·function·from·<code·class="inline">A</code>s·to·lists·of·<code·class="inline">B</code>s,·and·a·list·of·<code·class="inline">A</code>s·(<code·class="inline">List1</code>)·and1557 <p>Takes·a·function·from·<code·class="inline">A</code>s·to·lists·of·<code·class="inline">B</code>s,·and·a·list·of·<code·class="inline">A</code>s·(<code·class="inline">List1</code>)·and
1558 produces·a·list·of·<code·class="inline">B</code>s·by·applying·the·function·to·every·element·in·<code·class="inline">List1</code>·and1558 produces·a·list·of·<code·class="inline">B</code>s·by·applying·the·function·to·every·element·in·<code·class="inline">List1</code>·and
1559 appending·the·resulting·lists.</p><p>That·is,·<code·class="inline">flatmap</code>·behaves·as·if·it·had·been·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">flatmap</span><span·class="p"·data-group-id="7802500716-1">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="7802500716-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1559 appending·the·resulting·lists.</p><p>That·is,·<code·class="inline">flatmap</code>·behaves·as·if·it·had·been·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">flatmap</span><span·class="p"·data-group-id="3405765869-1">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="3405765869-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1560 ····</span><span·class="nf">append</span><span·class="p"·data-group-id="7802500716-2">(</span><span·class="nf">map</span><span·class="p"·data-group-id="7802500716-3">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="7802500716-3">)</span[·...·truncated·by·diffoscope;·len:·1073,·SHA:·996bb5507356dc279ead0bb576f543b1a4a890fbae40b75135ab882852313a0a·...·]-1">)</span><span·class="p">.</span><span·class="w">1560 ····</span><span·class="nf">append</span><span·class="p"·data-group-id="3405765869-2">(</span><span·class="nf">map</span><span·class="p"·data-group-id="3405765869-3">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="n">List1</span><span·class="p"·data-group-id="3405765869-3">)</span[·...·truncated·by·diffoscope;·len:·1073,·SHA:·17ddc8f9b2ef9ff7b9c088f00486a12660d0886d9e6ba0815d8438fcc69d5b9d·...·]-1">)</span><span·class="p">.</span><span·class="w">
1561 </span><span·class="p"·data-group-id="8832363941-5">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="[·...·truncated·by·diffoscope;·len:·77,·SHA:·aaa48e908a790657adaae6006d6728a6b227c26256cb2642e4efe2e324e66273·...·]-5">]</span></code></pre>1561 </span><span·class="p"·data-group-id="9424148345-5">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·class="ss">c</span><span·class="[·...·truncated·by·diffoscope;·len:·77,·SHA:·6e392c2738b1a48ef55319a925f4b08542ab41c27440fc7a9f31b3ad706d59bb·...·]-5">]</span></code></pre>
1562 ··</section>1562 ··</section>
1563 </section>1563 </section>
1564 <section·class="detail"·id="flatten/1">1564 <section·class="detail"·id="flatten/1">
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443 ······<p·class="built-using">443 ······<p·class="built-using">
444 ········Built·using444 ········Built·using
445 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the445 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
446 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>446 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
447 ······</p>447 ······</p>
448 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>448 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
449 ····</footer>449 ····</footer>
450 ··</div>450 ··</div>
451 </main>451 </main>
452 </div>452 </div>
453 <script>453 <script>
454 ··function·mermaidLoaded()·{454 ··function·mermaidLoaded()·{
455 ····mermaid.initialize({455 ····mermaid.initialize({
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1138 ······<p·class="built-using">1138 ······<p·class="built-using">
1139 ········Built·using1139 ········Built·using
1140 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1140 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1141 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1141 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1142 ······</p>1142 ······</p>
1143 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1143 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1144 ····</footer>1144 ····</footer>
1145 ··</div>1145 ··</div>
1146 </main>1146 </main>
1147 </div>1147 </div>
1148 <script>1148 <script>
1149 ··function·mermaidLoaded()·{1149 ··function·mermaidLoaded()·{
1150 ····mermaid.initialize({1150 ····mermaid.initialize({
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150 ··</a>150 ··</a>
151 ··<span·class="text">Example·1</span>151 ··<span·class="text">Example·1</span>
152 </h2>152 </h2>
153 <p>Using·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·and·a·match·specification,·one·can·filter·out·rows·of·a153 <p>Using·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·and·a·match·specification,·one·can·filter·out·rows·of·a
154 table·and·construct·a·list·of·tuples·containing·relevant·parts·of·the·data·in154 table·and·construct·a·list·of·tuples·containing·relevant·parts·of·the·data·in
155 these·rows.·One·can·use·<a·href="ets.html#foldl/3"><code·class="inline">ets:foldl/3</code></a>·instead,·but·the·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·call·is155 these·rows.·One·can·use·<a·href="ets.html#foldl/3"><code·class="inline">ets:foldl/3</code></a>·instead,·but·the·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·call·is
156 far·more·efficient.·Without·the·translation·provided·by·<code·class="inline">ms_transform</code>,·one·must156 far·more·efficient.·Without·the·translation·provided·by·<code·class="inline">ms_transform</code>,·one·must
157 struggle·with·writing·match·specifications·terms·to·accommodate·this.</p><p>Consider·a·simple·table·of·employees:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="0382437918-1">(</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0382437918-2">{</span><span·class="ss">empno</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%Employee·number·as·a·string,·the·key</span><span·class="w">157 struggle·with·writing·match·specifications·terms·to·accommodate·this.</p><p>Consider·a·simple·table·of·employees:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="8580328888-1">(</span><span·class="ss">emp</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8580328888-2">{</span><span·class="ss">empno</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%Employee·number·as·a·string,·the·key</span><span·class="w">
158 ··············</span><span·class="ss">surname</span><span·class="p">,</span><span·class="w">···</span><span·class="c1">%Surname·of·the·employee</span><span·class="w">158 ··············</span><span·class="ss">surname</span><span·class="p">,</span><span·class="w">···</span><span·class="c1">%Surname·of·the·employee</span><span·class="w">
159 ··············</span><span·class="ss">givenname</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%Given·name·of·employee</span><span·class="w">159 ··············</span><span·class="ss">givenname</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%Given·name·of·employee</span><span·class="w">
160 ··············</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">······</span><span·class="c1">%Department,·one·of·{dev,sales,prod,adm}</span><span·class="w">160 ··············</span><span·class="ss">dept</span><span·class="p">,</span><span·class="w">······</span><span·class="c1">%Department,·one·of·{dev,sales,prod,adm}</span><span·class="w">
161 ··············</span><span·class="ss">empyear</span><span·class="p"·data-group-id="0382437918-2">}</span><span·class="p"·data-group-id="0382437918-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%Year·the·employee·was·employed</span></code></pre><p>We·create·the·table·using:</p><pre><code·class="text">ets:new([·...·truncated·by·diffoscope;·len:·641,·SHA:·423e671f258af03bd02b0109457c56638ce90ea1412b8ca72bbb7c12139a1801·...·]-2">}</span><span·class="p">,</span><span·class="w">161 ··············</span><span·class="ss">empyear</span><span·class="p"·data-group-id="8580328888-2">}</span><span·class="p"·data-group-id="8580328888-1">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%Year·the·employee·was·employed</span></code></pre><p>We·create·the·table·using:</p><pre><code·class="text">ets:new([·...·truncated·by·diffoscope;·len:·641,·SHA:·6bfc41ce6025c7c6c5d426b8711ca99487a649c3d0fd6ca7614fa9648620ad80·...·]-2">}</span><span·class="p">,</span><span·class="w">
162 ·</span><span·class="p"·data-group-id="7099862742-3">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;041231&quot;</span><span·class="p">,</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·128,·SHA:·d9f998680bb53b154fea917aa5354d41218fcfbedbb3457e2217a5e9ee492939·...·]-3">}</span><span·class="p">,</span><span·class="w">162 ·</span><span·class="p"·data-group-id="4651199581-3">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;041231&quot;</span><span·class="p">,</span><span·class="s">&quot;Doe&quot;</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p">,[·...·truncated·by·diffoscope;·len:·128,·SHA:·8457f2d25c7c2f9d94c5435a16f27269732624f4e123abb0678f030870410771·...·]-3">}</span><span·class="p">,</span><span·class="w">
163 ·</span><span·class="p"·data-group-id="7099862742-4">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;052341&quot;</span><span·class="p">,</span><span·class="s">&quot;Smith&quot;</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p"[·...·truncated·by·diffoscope;·len:·129,·SHA:·8444152ec1f24f222f4c9ce795b4d0a41bf0b9b2c8858489502eeb61dbbf8584·...·]-4">}</span><span·class="p">,</span><span·class="w">163 ·</span><span·class="p"·data-group-id="4651199581-4">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;052341&quot;</span><span·class="p">,</span><span·class="s">&quot;Smith&quot;</span><span·class="p">,</span><span·class="s">&quot;John&quot;</span><span·class="p"[·...·truncated·by·diffoscope;·len:·129,·SHA:·276522c2fdbf644e48810f208abce6c2c70836641db361dc0d4a9200f610e355·...·]-4">}</span><span·class="p">,</span><span·class="w">
164 ·</span><span·class="p"·data-group-id="7099862742-5">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;076324&quot;</span><span·class="p">,</span><span·class="s">&quot;Smith&quot;</span><span·class="p">,</span><span·class="s">&quot;Ella&quot;</span><span·class="p"[·...·truncated·by·diffoscope;·len:·131,·SHA:·3c316b9af71b7813f4d25bae85019b87a92fe455f44008583ccc536e6ff9c784·...·]-5">}</span><span·class="p">,</span><span·class="w">164 ·</span><span·class="p"·data-group-id="4651199581-5">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;076324&quot;</span><span·class="p">,</span><span·class="s">&quot;Smith&quot;</span><span·class="p">,</span><span·class="s">&quot;Ella&quot;</span><span·class="p"[·...·truncated·by·diffoscope;·len:·131,·SHA:·7eed91d7de0b8f0d8564801d7612e68c2f7b7d61f171a94536623a04ea2d3f3d·...·]-5">}</span><span·class="p">,</span><span·class="w">
165 ·</span><span·class="p"·data-group-id="7099862742-6">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;122334&quot;</span><span·class="p">,</span><span·class="s">&quot;Weston&quot;</span><span·class="p">,</span><span·class="s">&quot;Anna&quot;</span><span·class="p[·...·truncated·by·diffoscope;·len:·131,·SHA:·28071b1a9fd8414f2608e7c663f37d6cf532fa3adf81510c3a65c66efda4a0af·...·]-6">}</span><span·class="p">,</span><span·class="w">165 ·</span><span·class="p"·data-group-id="4651199581-6">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;122334&quot;</span><span·class="p">,</span><span·class="s">&quot;Weston&quot;</span><span·class="p">,</span><span·class="s">&quot;Anna&quot;</span><span·class="p[·...·truncated·by·diffoscope;·len:·131,·SHA:·6c16f5b3ba65059a0a407f48a1d50f8b9b8e939af680fe24ef0f9f69a137517f·...·]-6">}</span><span·class="p">,</span><span·class="w">
166 ·</span><span·class="p"·data-group-id="7099862742-7">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;535216&quot;</span><span·class="p">,</span><span·class="s">&quot;Chalker&quot;</span><span·class="p">,</span><span·class="s">&quot;Samuel&quot;</span><span·class[·...·truncated·by·diffoscope;·len:·133,·SHA:·914b8888acd87010743bda516fbc3c1378a1c5484ffaf3b80bb9268fb380c67f·...·]-7">}</span><span·class="p">,</span><span·class="w">166 ·</span><span·class="p"·data-group-id="4651199581-7">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;535216&quot;</span><span·class="p">,</span><span·class="s">&quot;Chalker&quot;</span><span·class="p">,</span><span·class="s">&quot;Samuel&quot;</span><span·class[·...·truncated·by·diffoscope;·len:·133,·SHA:·9c295313305fe4288adb0c5acf47032be8d9c8b01be546eadca28e9a578a7a60·...·]-7">}</span><span·class="p">,</span><span·class="w">
167 ·</span><span·class="p"·data-group-id="7099862742-8">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;789789&quot;</span><span·class="p">,</span><span·class="s">&quot;Harrysson&quot;</span><span·class="p">,</span><span·class="s">&quot;Joe&quot;</span><span·class=[·...·truncated·by·diffoscope;·len:·132,·SHA:·eb9bcfb35849f4e1f9b9261f048c13429e39ea97a12106ca248f5b1cc9bb3f30·...·]-8">}</span><span·class="p">,</span><span·class="w">167 ·</span><span·class="p"·data-group-id="4651199581-8">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;789789&quot;</span><span·class="p">,</span><span·class="s">&quot;Harrysson&quot;</span><span·class="p">,</span><span·class="s">&quot;Joe&quot;</span><span·class=[·...·truncated·by·diffoscope;·len:·132,·SHA:·7c50c8760b12be61e000f2ad1d77de90075ba8356a32c4ac4693cc353892b81b·...·]-8">}</span><span·class="p">,</span><span·class="w">
168 ·</span><span·class="p"·data-group-id="7099862742-9">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;963721&quot;</span><span·class="p">,</span><span·class="s">&quot;Scott&quot;</span><span·class="p">,</span><span·class="s">&quot;Juliana&quot;</span><span·class=[·...·truncated·by·diffoscope;·len:·132,·SHA:·552f52a533eab5e0a09e0fcc1735f8bdc8760eb068250c53b0340469a12054bf·...·]-9">}</span><span·class="p">,</span><span·class="w">168 ·</span><span·class="p"·data-group-id="4651199581-9">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;963721&quot;</span><span·class="p">,</span><span·class="s">&quot;Scott&quot;</span><span·class="p">,</span><span·class="s">&quot;Juliana&quot;</span><span·class=[·...·truncated·by·diffoscope;·len:·132,·SHA:·b90f33352a48552ba20ca469c62b16e7005053ee052111e83a5985ade35cb1ef·...·]-9">}</span><span·class="p">,</span><span·class="w">
169 ·</span><span·class="p"·data-group-id="7099862742-10">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;989891&quot;</span><span·class="p">,</span><span·class="s">&quot;Brown&quot;</span><span·class="p">,</span><span·class="s">&quot;Gabriel&quot;</span><span·class[·...·truncated·by·diffoscope;·len:·188,·SHA:·ffb8e810909a4fd34e95057cdb5e360ac1b6025a9d64dc252ab70578347dafdd·...·]-1">]</span></code></pre><p>Assuming·that·we·want·the·employee·numbers·of·everyone·in·the·sales·department,169 ·</span><span·class="p"·data-group-id="4651199581-10">{</span><span·class="ss">emp</span><span·class="p">,</span><span·class="s">&quot;989891&quot;</span><span·class="p">,</span><span·class="s">&quot;Brown&quot;</span><span·class="p">,</span><span·class="s">&quot;Gabriel&quot;</span><span·class[·...·truncated·by·diffoscope;·len:·188,·SHA:·1cf26e14a25527edfff69a3e034b31f9cdbd0d4b8d11fb4efcfd6ec20cef8699·...·]-1">]</span></code></pre><p>Assuming·that·we·want·the·employee·numbers·of·everyone·in·the·sales·department,
170 there·are·several·ways.</p><p><a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="2407728712-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2407728712-2">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#[·...·truncated·by·diffoscope;·len:·437,·SHA:·779fdf41d4b08080f0099fd6c4154acaa97c7a71a455896a6d3f2a07958ecb1a·...·]-1">)</span><span·class="p">.</span><span·class="w">170 there·are·several·ways.</p><p><a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">match</span><span·class="p"·data-group-id="3825578909-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3825578909-2">{</span><span·class="ss">&#39;_&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#[·...·truncated·by·diffoscope;·len:·437,·SHA:·5c7716091366354dc38d532ccf4e18748e9076f09eb060eaf5425828ffb135d1·...·]-1">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="p"·data-group-id="2407728712-3">[</span><span·class="p"·data-group-id="2407728712-4">[</span><span·class="s">&quot;011103&quot;</span><span·class="p"·data-group-id="2407728712-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="2407728712-5">[</span><span·clas[·...·truncated·by·diffoscope;·len:·125,·SHA:·b7f38b6cfb70bf2e28f61adde105afb225757cbc4c14f026cb909e7888b7c11f·...·]-3">]</span></code></pre><p><a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·uses·a·simpler·type·of·match·specification,·but·it·is·still171 </span><span·class="p"·data-group-id="3825578909-3">[</span><span·class="p"·data-group-id="3825578909-4">[</span><span·class="s">&quot;011103&quot;</span><span·class="p"·data-group-id="3825578909-4">]</span><span·class="p">,</span><span·class="p"·data-group-id="3825578909-5">[</span><span·clas[·...·truncated·by·diffoscope;·len:·125,·SHA:·e0b8136b3baa2d1b182dbb1b98f4184f644ae40a1d72ab9fabba5f7e5476b665·...·]-3">]</span></code></pre><p><a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·uses·a·simpler·type·of·match·specification,·but·it·is·still
172 unreadable,·and·one·has·little·control·over·the·returned·result.·It·is·always·a172 unreadable,·and·one·has·little·control·over·the·returned·result.·It·is·always·a
173 list·of·lists.</p><p><a·href="ets.html#foldl/3"><code·class="inline">ets:foldl/3</code></a>·or·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·can·be·used·to·avoid·the·nested·lists:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="2924165130-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="2924165130-2">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="2924165130-3">{</span><span·class="ss">empno</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·699,·SHA:·4a73f676de354a00d72310ca72bba487c5e39fadcade7bfbf819822a2aed3a65·...·]0-4">]</span><span·class="p">;</span><span·class="w">173 list·of·lists.</p><p><a·href="ets.html#foldl/3"><code·class="inline">ets:foldl/3</code></a>·or·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·can·be·used·to·avoid·the·nested·lists:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7648484020-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7648484020-2">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="7648484020-3">{</span><span·class="ss">empno</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·699,·SHA:·d9dba058c061ea82626f703a9d31f82a74d776b865bcfa4fd3f2b4f02291f5ca·...·]0-4">]</span><span·class="p">;</span><span·class="w">
174 ·············</span><span·class="p"·data-group-id="2924165130-5">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Acc</span><span·class="p"·data-group-id="2924165130-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">174 ·············</span><span·class="p"·data-group-id="7648484020-5">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Acc</span><span·class="p"·data-group-id="7648484020-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">
175 ··········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">175 ··········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
176 ··········</span><span·class="p"·data-group-id="2924165130-6">[</span><span·class="p"·data-group-id="2924165130-6">]</span><span·class="p">,</span><span·class="w">176 ··········</span><span·class="p"·data-group-id="7648484020-6">[</span><span·class="p"·data-group-id="7648484020-6">]</span><span·class="p">,</span><span·class="w">
177 ··········</span><span·class="ss">emp_tab</span><span·class="p"·data-group-id="2924165130-1">)</span><span·class="p">.</span></code></pre><p>The·result·is·<code·class="inline">[&quot;011103&quot;,&quot;076324&quot;]</code>.·The·fun·is·straightforward,·so·the·only177 ··········</span><span·class="ss">emp_tab</span><span·class="p"·data-group-id="7648484020-1">)</span><span·class="p">.</span></code></pre><p>The·result·is·<code·class="inline">[&quot;011103&quot;,&quot;076324&quot;]</code>.·The·fun·is·straightforward,·so·the·only
178 problem·is·that·all·the·data·from·the·table·must·be·transferred·from·the·table178 problem·is·that·all·the·data·from·the·table·must·be·transferred·from·the·table
179 to·the·calling·process·for·filtering.·That·is·inefficient·compared·to·the179 to·the·calling·process·for·filtering.·That·is·inefficient·compared·to·the
180 <a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·call·where·the·filtering·can·be·done·&quot;inside&quot;·the·emulator·and180 <a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·call·where·the·filtering·can·be·done·&quot;inside&quot;·the·emulator·and
181 only·the·result·is·transferred·to·the·process.</p><p>Consider·a·&quot;pure&quot;·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·call·that·does·what·<code·class="inline">ets:foldr</code>·does:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="0212432111-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0212432111-2">[</span><span·class="p"·data-group-id="0212432111-3">{</span><span·class="o">#</span><span·class="ss">emp</spa[·...·truncated·by·diffoscope;·len:·996,·SHA:·493b7dc38b744ec9859e39179d4241662c102309da35b9994e7395c44e5a849a·...·]-1">)</span><span·class="p">.</span></code></pre><p>Although·the·record·syntax·is·used,·it·is·still·hard·to·read·and·even·harder·to181 only·the·result·is·transferred·to·the·process.</p><p>Consider·a·&quot;pure&quot;·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·call·that·does·what·<code·class="inline">ets:foldr</code>·does:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="6345717665-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6345717665-2">[</span><span·class="p"·data-group-id="6345717665-3">{</span><span·class="o">#</span><span·class="ss">emp</spa[·...·truncated·by·diffoscope;·len:·996,·SHA:·535278f87bba51901e4d946bf4b081cb5e82d02acd17d88229818d00d869f05b·...·]-1">)</span><span·class="p">.</span></code></pre><p>Although·the·record·syntax·is·used,·it·is·still·hard·to·read·and·even·harder·to
182 write.·The·first·element·of·the·tuple,182 write.·The·first·element·of·the·tuple,
183 <code·class="inline">#emp{empno·=·'$1',·dept·=·sales,·_='_'}</code>,·tells·what·to·match.·Elements·not183 <code·class="inline">#emp{empno·=·'$1',·dept·=·sales,·_='_'}</code>,·tells·what·to·match.·Elements·not
184 matching·this·are·not·returned,·as·in·the·<a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·example.·The·second184 matching·this·are·not·returned,·as·in·the·<a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·example.·The·second
185 element,·the·empty·list,·is·a·list·of·guard·expressions,·which·we·do·not·need.185 element,·the·empty·list,·is·a·list·of·guard·expressions,·which·we·do·not·need.
186 The·third·element·is·the·list·of·expressions·constructing·the·return·value·(in186 The·third·element·is·the·list·of·expressions·constructing·the·return·value·(in
187 ETS·this·is·almost·always·a·list·containing·one·single·term).·In·our·case·<code·class="inline">'$1'</code>187 ETS·this·is·almost·always·a·list·containing·one·single·term).·In·our·case·<code·class="inline">'$1'</code>
188 is·bound·to·the·employee·number·in·the·head·(first·element·of·the·tuple),·and188 is·bound·to·the·employee·number·in·the·head·(first·element·of·the·tuple),·and
189 hence·the·employee·number·is·returned.·The·result·is·<code·class="inline">[&quot;011103&quot;,&quot;076324&quot;]</code>,·as189 hence·the·employee·number·is·returned.·The·result·is·<code·class="inline">[&quot;011103&quot;,&quot;076324&quot;]</code>,·as
190 in·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·example,·but·the·result·is·retrieved·much·more·efficiently190 in·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·example,·but·the·result·is·retrieved·much·more·efficiently
191 in·terms·of·execution·speed·and·memory·consumption.</p><p>Using·<a·href="ets.html#fun2ms/1"><code·class="inline">ets:fun2ms/1</code></a>,·we·can·combine·the·ease·of·use·of·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·and191 in·terms·of·execution·speed·and·memory·consumption.</p><p>Using·<a·href="ets.html#fun2ms/1"><code·class="inline">ets:fun2ms/1</code></a>,·we·can·combine·the·ease·of·use·of·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·and
192 the·efficiency·of·the·pure·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9534877817-1">(</span><span·class="s">&quot;stdlib/include/ms_transform.hrl&quot;</span><span·class="p"·data-group-id="9534877817-1">)</span><span·class="p">.</span><span·class="w">192 the·efficiency·of·the·pure·<a·href="ets.html#select/2"><code·class="inline">ets:select/2</code></a>·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="5287439083-1">(</span><span·class="s">&quot;stdlib/include/ms_transform.hrl&quot;</span><span·class="p"·data-group-id="5287439083-1">)</span><span·class="p">.</span><span·class="w">
  
193 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="9534877817-2">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="9534877817-3">(</span><span·class="w">193 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="5287439083-2">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="5287439083-3">(</span><span·class="w">
194 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="9534877817-4">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="9534877817-5">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·266,·SHA:·4fc2409273e71c443e52362153c6e7ca317f1c62cb8af4d0e199e42633522bc2·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="5287439083-4">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="5287439083-5">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·266,·SHA:·f563e4e13ee6edb77f63a539c463ee39f4207d07541d6baa0b036ad5ac967973·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ······························</span><span·class="n">E</span><span·class="w">195 ······························</span><span·class="n">E</span><span·class="w">
196 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="9534877817-3">)</span><span·class="p"·data-group-id="9534877817-2">)</span><span·class="p">.</span></code></pre><p>This·example·requires·no·special·knowledge·of·match·specifications·to196 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="5287439083-3">)</span><span·class="p"·data-group-id="5287439083-2">)</span><span·class="p">.</span></code></pre><p>This·example·requires·no·special·knowledge·of·match·specifications·to
197 understand.·The·head·of·the·fun·matches·what·you·want·to·filter·out·and·the·body197 understand.·The·head·of·the·fun·matches·what·you·want·to·filter·out·and·the·body
198 returns·what·you·want·returned.·As·long·as·the·fun·can·be·kept·within·the·limits198 returns·what·you·want·returned.·As·long·as·the·fun·can·be·kept·within·the·limits
199 of·the·match·specifications,·there·is·no·need·to·transfer·all·table·data·to·the199 of·the·match·specifications,·there·is·no·need·to·transfer·all·table·data·to·the
200 process·for·filtering·as·in·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·example.·It·is·easier·to·read·than200 process·for·filtering·as·in·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·example.·It·is·easier·to·read·than
201 the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·example,·as·the·select·call·in·itself·discards·anything·that201 the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·example,·as·the·select·call·in·itself·discards·anything·that
202 does·not·match,·while·the·fun·of·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·call·needs·to·handle·both·the202 does·not·match,·while·the·fun·of·the·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·call·needs·to·handle·both·the
203 elements·matching·and·the·ones·not·matching.</p><p>In·the·<a·href="ets.html#fun2ms/1"><code·class="inline">ets:fun2ms/1</code></a>·example·above,·it·is·needed·to·include·<code·class="inline">ms_transform.hrl</code>203 elements·matching·and·the·ones·not·matching.</p><p>In·the·<a·href="ets.html#fun2ms/1"><code·class="inline">ets:fun2ms/1</code></a>·example·above,·it·is·needed·to·include·<code·class="inline">ms_transform.hrl</code>
Offset 212, 90 lines modifiedOffset 212, 90 lines modified
212 ····<i·class="ri-link-m"·aria-hidden="true"></i>212 ····<i·class="ri-link-m"·aria-hidden="true"></i>
213 ··</a>213 ··</a>
214 ··<span·class="text">Example·2</span>214 ··<span·class="text">Example·2</span>
215 </h2>215 </h2>
216 <p>Assume·that·we·want·to·get·all·the·employee·numbers·of·employees·hired·before216 <p>Assume·that·we·want·to·get·all·the·employee·numbers·of·employees·hired·before
217 year·2000.·Using·<a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·is·not·an·alternative·here,·as·relational217 year·2000.·Using·<a·href="ets.html#match/2"><code·class="inline">ets:match/2</code></a>·is·not·an·alternative·here,·as·relational
218 operators·cannot·be·expressed·there.·Once·again,·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·can·do·it218 operators·cannot·be·expressed·there.·Once·again,·<a·href="ets.html#foldr/3"><code·class="inline">ets:foldr/3</code></a>·can·do·it
219 (slowly,·but·correct):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="0379289784-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0379289784-2">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="0379289784-3">{</span><span·class="ss">empno</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·900,·SHA:·ce9c82adf3a36664a2b2457eb29d973ba15dcc3604b4c597c21f32343fa88b55·...·]-4">]</span><span·class="p">;</span><span·class="w">219 (slowly,·but·correct):</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">foldr</span><span·class="p"·data-group-id="7150751141-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="7150751141-2">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="7150751141-3">{</span><span·class="ss">empno</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·900,·SHA:·5cc4ab18704f08e6498affafcd4e24f744e6e21d2df785e2f364823ffe6a0bf6·...·]-4">]</span><span·class="p">;</span><span·class="w">
220 ··················</span><span·class="p"·data-group-id="0379289784-5">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Acc</span><span·class="p"·data-group-id="0379289784-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">220 ··················</span><span·class="p"·data-group-id="7150751141-5">(</span><span·class="p">_</span><span·class="p">,</span><span·class="n">Acc</span><span·class="p"·data-group-id="7150751141-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">
221 ··········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">221 ··········</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
222 ··········</span><span·class="p"·data-group-id="0379289784-6">[</span><span·class="p"·data-group-id="0379289784-6">]</span><span·class="p">,</span><span·class="w">222 ··········</span><span·class="p"·data-group-id="7150751141-6">[</span><span·class="p"·data-group-id="7150751141-6">]</span><span·class="p">,</span><span·class="w">
223 ··········</span><span·class="ss">emp_tab</span><span·class="p"·data-group-id="0379289784-1">)</span><span·class="p">.</span></code></pre><p>The·result·is·<code·class="inline">[&quot;052341&quot;,&quot;076324&quot;,&quot;535216&quot;,&quot;789789&quot;,&quot;989891&quot;]</code>,·as·expected.·The223 ··········</span><span·class="ss">emp_tab</span><span·class="p"·data-group-id="7150751141-1">)</span><span·class="p">.</span></code></pre><p>The·result·is·<code·class="inline">[&quot;052341&quot;,&quot;076324&quot;,&quot;535216&quot;,&quot;789789&quot;,&quot;989891&quot;]</code>,·as·expected.·The
224 equivalent·expression·using·a·handwritten·match·specification·would·look·like224 equivalent·expression·using·a·handwritten·match·specification·would·look·like
225 this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="6235326875-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6235326875-2">[</span><span·class="p"·data-group-id="6235326875-3">{</span><span·class="o">#</span><span·class="ss">emp</spa[·...·truncated·by·diffoscope;·len:·551,·SHA:·c734322330deaf935b93e18a54b1d9ee48e043cd120c8d057cf91728bc42a764·...·]-4">}</span><span·class="p">,</span><span·class="w">225 this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="1587336472-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1587336472-2">[</span><span·class="p"·data-group-id="1587336472-3">{</span><span·class="o">#</span><span·class="ss">emp</spa[·...·truncated·by·diffoscope;·len:·551,·SHA:·b137cfba99d82f546013445c1e277ccc102a919557eba6b4c43dcc631cf01aa2·...·]-4">}</span><span·class="p">,</span><span·class="w">
226 ·····················</span><span·class="p"·data-group-id="6235326875-5">[</span><span·class="p"·data-group-id="6235326875-6">{</span><span·class="ss">&#39;&lt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·111,·SHA:·923947b7ce8dffb1c448b732bc22e55cf9dbb2071bfb586a1bef473bfbecfe78·...·]-5">]</span><span·class="p">,</span><span·class="w">226 ·····················</span><span·class="p"·data-group-id="1587336472-5">[</span><span·class="p"·data-group-id="1587336472-6">{</span><span·class="ss">&#39;&lt;&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;$2&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·111,·SHA:·535a60650ef77fd1c43b34f62c412411b971a75a48a53b2bb48a6bcf9d1c1a6c·...·]-5">]</span><span·class="p">,</span><span·class="w">
227 ·····················</span><span·class="p"·data-group-id="6235326875-7">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="6235326875-7">]</span><span·class="p"·data-group-id="6235326875-3">}</span><span·class="p"·data-group-id="6235326875-2">]</span><span·class="p"·data-group-id="62353268[·...·truncated·by·diffoscope;·len:·2,·SHA:·f369cb89fc627e668987007d121ed1eacdc01db9e28f8bb26f358b7d8c4f08ac·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·gives·the·same·result.·<code·class="inline">[{'&lt;',·'$2',·2000}]</code>·is·in·the·guard·part·and227 ·····················</span><span·class="p"·data-group-id="1587336472-7">[</span><span·class="ss">&#39;$1&#39;</span><span·class="p"·data-group-id="1587336472-7">]</span><span·class="p"·data-group-id="1587336472-3">}</span><span·class="p"·data-group-id="1587336472-2">]</span><span·class="p"·data-group-id="15873364[·...·truncated·by·diffoscope;·len:·2,·SHA:·8722616204217eddb39e7df969e0698aed8e599ba62ed2de1ce49b03ade0fede·...·]-1">)</span><span·class="p">.</span></code></pre><p>This·gives·the·same·result.·<code·class="inline">[{'&lt;',·'$2',·2000}]</code>·is·in·the·guard·part·and
228 therefore·discards·anything·that·does·not·have·an·<code·class="inline">empyear</code>·(bound·to·<code·class="inline">'$2'</code>·in228 therefore·discards·anything·that·does·not·have·an·<code·class="inline">empyear</code>·(bound·to·<code·class="inline">'$2'</code>·in
229 the·head)·less·than·2000,·as·the·guard·in·the·<code·class="inline">foldr/3</code>·example.</p><p>We·write·it·using·<a·href="ets.html#fun2ms/1"><code·class="inline">ets:fun2ms/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9823385948-1">(</span><span·class="s">&quot;stdlib/include/ms_transform.hrl&quot;</span><span·class="p"·data-group-id="9823385948-1">)</span><span·class="p">.</span><span·class="w">229 the·head)·less·than·2000,·as·the·guard·in·the·<code·class="inline">foldr/3</code>·example.</p><p>We·write·it·using·<a·href="ets.html#fun2ms/1"><code·class="inline">ets:fun2ms/1</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3008610178-1">(</span><span·class="s">&quot;stdlib/include/ms_transform.hrl&quot;</span><span·class="p"·data-group-id="3008610178-1">)</span><span·class="p">.</span><span·class="w">
  
230 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="9823385948-2">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="9823385948-3">(</span><span·class="w">230 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="3008610178-2">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="3008610178-3">(</span><span·class="w">
231 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="9823385948-4">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="9823385948-5">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·263,·SHA:·26c68038a7a1d341946aad731992843f9676dfb99f0f61995e925f5685011a4d·...·]8-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">2000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="3008610178-4">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="3008610178-5">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·263,·SHA:·066e6836bc541a46f39dcf7ac9e9e1d777d7f5cbbfc1f63036d11150fadcde57·...·]8-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">2000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ···························</span><span·class="n">E</span><span·class="w">232 ···························</span><span·class="n">E</span><span·class="w">
233 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="9823385948-3">)</span><span·class="p"·data-group-id="9823385948-2">)</span><span·class="p">.</span></code></pre><h2·id="module-example-3"·class="section-heading">233 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="3008610178-3">)</span><span·class="p"·data-group-id="3008610178-2">)</span><span·class="p">.</span></code></pre><h2·id="module-example-3"·class="section-heading">
234 ··<a·href="#module-example-3"·class="hover-link">234 ··<a·href="#module-example-3"·class="hover-link">
235 ····<i·class="ri-link-m"·aria-hidden="true"></i>235 ····<i·class="ri-link-m"·aria-hidden="true"></i>
236 ··</a>236 ··</a>
237 ··<span·class="text">Example·3</span>237 ··<span·class="text">Example·3</span>
238 </h2>238 </h2>
239 <p>Assume·that·we·want·the·whole·object·matching·instead·of·only·one·element.·One239 <p>Assume·that·we·want·the·whole·object·matching·instead·of·only·one·element.·One
240 alternative·is·to·assign·a·variable·to·every·part·of·the·record·and·build·it·up240 alternative·is·to·assign·a·variable·to·every·part·of·the·record·and·build·it·up
241 once·again·in·the·body·of·the·fun,·but·the·following·is·easier:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="0451271242-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="0451271242-2">(</span><span·class="w">241 once·again·in·the·body·of·the·fun,·but·the·following·is·easier:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="6452667066-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="6452667066-2">(</span><span·class="w">
242 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="0451271242-3">(</span><span·class="n">Obj</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="0451271242-4">{</span><span·class="ss">empno</span><sp[·...·truncated·by·diffoscope;·len:·362,·SHA:·ee4b537f247f585d21148d666c160f0a52323a39da124d98532f5fb3a8c88c74·...·]-3">)</span><span·class="w">242 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="6452667066-3">(</span><span·class="n">Obj</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="6452667066-4">{</span><span·class="ss">empno</span><sp[·...·truncated·by·diffoscope;·len:·362,·SHA:·b6c55b0d5afef5017dacb1b1d8c7f434e7c16e7429c3748a06721ced0a29f596·...·]-3">)</span><span·class="w">
243 ·························</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">2000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">243 ·························</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">2000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
244 ······························</span><span·class="n">Obj</span><span·class="w">244 ······························</span><span·class="n">Obj</span><span·class="w">
245 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="0451271242-2">)</span><span·class="p"·data-group-id="0451271242-1">)</span><span·class="p">.</span></code></pre><p>As·in·ordinary·Erlang·matching,·you·can·bind·a·variable·to·the·whole·matched245 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="6452667066-2">)</span><span·class="p"·data-group-id="6452667066-1">)</span><span·class="p">.</span></code></pre><p>As·in·ordinary·Erlang·matching,·you·can·bind·a·variable·to·the·whole·matched
246 object·using·a·&quot;match·inside·the·match&quot;,·that·is,·a·<code·class="inline">=</code>.·Unfortunately·in·funs246 object·using·a·&quot;match·inside·the·match&quot;,·that·is,·a·<code·class="inline">=</code>.·Unfortunately·in·funs
247 translated·to·match·specifications,·it·is·allowed·only·at·the·&quot;top-level&quot;,·that247 translated·to·match·specifications,·it·is·allowed·only·at·the·&quot;top-level&quot;,·that
248 is,·matching·the·<em>whole</em>·object·arriving·to·be·matched·into·a·separate·variable.248 is,·matching·the·<em>whole</em>·object·arriving·to·be·matched·into·a·separate·variable.
249 If·you·are·used·to·writing·match·specifications·by·hand,·we·mention·that249 If·you·are·used·to·writing·match·specifications·by·hand,·we·mention·that
250 variable·A·is·simply·translated·into·'$_'.·Alternatively,·pseudo·function250 variable·A·is·simply·translated·into·'$_'.·Alternatively,·pseudo·function
251 <code·class="inline">object/0</code>·also·returns·the·whole·matched·object,·see·section251 <code·class="inline">object/0</code>·also·returns·the·whole·matched·object,·see·section
252 <a·href="ms_transform.html#warnings_and_restrictions">Warnings·and·Restrictions</a>.</p><h2·id="module-example-4"·class="section-heading">252 <a·href="ms_transform.html#warnings_and_restrictions">Warnings·and·Restrictions</a>.</p><h2·id="module-example-4"·class="section-heading">
253 ··<a·href="#module-example-4"·class="hover-link">253 ··<a·href="#module-example-4"·class="hover-link">
254 ····<i·class="ri-link-m"·aria-hidden="true"></i>254 ····<i·class="ri-link-m"·aria-hidden="true"></i>
255 ··</a>255 ··</a>
256 ··<span·class="text">Example·4</span>256 ··<span·class="text">Example·4</span>
257 </h2>257 </h2>
258 <p>This·example·concerns·the·body·of·the·fun.·Assume·that·all·employee·numbers258 <p>This·example·concerns·the·body·of·the·fun.·Assume·that·all·employee·numbers
259 beginning·with·zero·(<code·class="inline">0</code>)·must·be·changed·to·begin·with·one·(<code·class="inline">1</code>)·instead,·and259 beginning·with·zero·(<code·class="inline">0</code>)·must·be·changed·to·begin·with·one·(<code·class="inline">1</code>)·instead,·and
260 that·we·want·to·create·the·list·<code·class="inline">[{&lt;Old·empno&gt;,&lt;New·empno&gt;}]</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="3718668828-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="3718668828-2">(</span><span·class="w">260 that·we·want·to·create·the·list·<code·class="inline">[{&lt;Old·empno&gt;,&lt;New·empno&gt;}]</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="2550216672-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="2550216672-2">(</span><span·class="w">
261 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="3718668828-3">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="3718668828-4">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·320,·SHA:·4ad08cc96535a0ff9d4cf1ded1de0f03c0ff95a1b6eea8e5bb984b067d0dfa4e·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">261 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="2550216672-3">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="2550216672-4">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·320,·SHA:·c4a7ec080409ef1f993d25ae589c14358a51c3bcc5a33c1b062d6a28e23ce2f5·...·]-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
262 ······························</span><span·class="p"·data-group-id="3718668828-6">{</span><span·class="p"·data-group-id="3718668828-7">[</span><span·class="sc">$0</span><span·class="p">|</span><span·class="n">Rest</span><span·class="p"·data-group-id="3718668828-7">]</span><span·class="p">,</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·197,·SHA:·eb0ab2a9c056f4e8557382c08be30122bf2ccefded8a1dcbb8b51822995cd46b·...·]-6">}</span><span·class="w">262 ······························</span><span·class="p"·data-group-id="2550216672-6">{</span><span·class="p"·data-group-id="2550216672-7">[</span><span·class="sc">$0</span><span·class="p">|</span><span·class="n">Rest</span><span·class="p"·data-group-id="2550216672-7">]</span><span·class="p">,</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·197,·SHA:·e0bbf9be16045b58bd357951d27af40a2cfa55a3d8cdeeeafe2faaefd7a2af12·...·]-6">}</span><span·class="w">
263 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="3718668828-2">)</span><span·class="p"·data-group-id="3718668828-1">)</span><span·class="p">.</span></code></pre><p>This·query·hits·the·feature·of·partially·bound·keys·in·table·type·<code·class="inline">ordered_set</code>,263 ······················</span><span·class="k">end</span><span·class="p"·data-group-id="2550216672-2">)</span><span·class="p"·data-group-id="2550216672-1">)</span><span·class="p">.</span></code></pre><p>This·query·hits·the·feature·of·partially·bound·keys·in·table·type·<code·class="inline">ordered_set</code>,
264 so·that·not·the·whole·table·needs·to·be·searched,·only·the·part·containing·keys264 so·that·not·the·whole·table·needs·to·be·searched,·only·the·part·containing·keys
265 beginning·with·<code·class="inline">0</code>·is·looked·into.</p><h2·id="module-example-5"·class="section-heading">265 beginning·with·<code·class="inline">0</code>·is·looked·into.</p><h2·id="module-example-5"·class="section-heading">
266 ··<a·href="#module-example-5"·class="hover-link">266 ··<a·href="#module-example-5"·class="hover-link">
267 ····<i·class="ri-link-m"·aria-hidden="true"></i>267 ····<i·class="ri-link-m"·aria-hidden="true"></i>
268 ··</a>268 ··</a>
269 ··<span·class="text">Example·5</span>269 ··<span·class="text">Example·5</span>
270 </h2>270 </h2>
271 <p>The·fun·can·have·many·clauses.·Assume·that·we·want·to·do·the·following:</p><ul><li>If·an·employee·started·before·1997,·return·the·tuple271 <p>The·fun·can·have·many·clauses.·Assume·that·we·want·to·do·the·following:</p><ul><li>If·an·employee·started·before·1997,·return·the·tuple
272 <code·class="inline">{inventory,·&lt;employee·number&gt;}</code>.</li><li>If·an·employee·started·1997·or·later,·but·before·2001,·return272 <code·class="inline">{inventory,·&lt;employee·number&gt;}</code>.</li><li>If·an·employee·started·1997·or·later,·but·before·2001,·return
273 <code·class="inline">{rookie,·&lt;employee·number&gt;}</code>.</li><li>For·all·other·employees,·return·<code·class="inline">{newbie,·&lt;employee·number&gt;}</code>,·except·for273 <code·class="inline">{rookie,·&lt;employee·number&gt;}</code>.</li><li>For·all·other·employees,·return·<code·class="inline">{newbie,·&lt;employee·number&gt;}</code>,·except·for
274 those·named·<code·class="inline">Smith</code>·as·they·would·be·affronted·by·anything·other·than·the·tag274 those·named·<code·class="inline">Smith</code>·as·they·would·be·affronted·by·anything·other·than·the·tag
275 <code·class="inline">guru</code>·and·that·is·also·what·is·returned·for·their·numbers:275 <code·class="inline">guru</code>·and·that·is·also·what·is·returned·for·their·numbers:
276 <code·class="inline">{guru,·&lt;employee·number&gt;}</code>.</li></ul><p>This·is·accomplished·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="7270420424-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="7270420424-2">(</span><span·class="w">276 <code·class="inline">{guru,·&lt;employee·number&gt;}</code>.</li></ul><p>This·is·accomplished·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">select</span><span·class="p"·data-group-id="6677775214-1">(</span><span·class="ss">emp_tab</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ets</span><span·class="p">:</span><span·class="nf">fun2ms</span><span·class="p"·data-group-id="6677775214-2">(</span><span·class="w">
277 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="7270420424-3">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="7270420424-4">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·303,·SHA:·b838fd3d1278088c54bddf91d14f2b1dced471d642dca51362eb019cfc69487f·...·]4-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">277 ······················</span><span·class="nf">fun</span><span·class="p"·data-group-id="6677775214-3">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="6677775214-4">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·303,·SHA:·02663ecb71246fbf973d9b2c5e097cfd261805a24457402c5ced9bf98ef063a5·...·]4-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
278 ······························</span><span·class="p"·data-group-id="7270420424-5">{</span><span·class="ss">guru</span><span·class="p">,</span><span·class="n">E</span><span·class="p"·data-group-id="7270420424-5">}</span><span·class="p">;</span><span·class="w">278 ······························</span><span·class="p"·data-group-id="6677775214-5">{</span><span·class="ss">guru</span><span·class="p">,</span><span·class="n">E</span><span·class="p"·data-group-id="6677775214-5">}</span><span·class="p">;</span><span·class="w">
279 ·························</span><span·class="p"·data-group-id="7270420424-6">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="7270420424-7">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·263,·SHA:·ac4cfb05c17514647526b6c34346c9a0343493d63d03fcc32f1939d366b732aa·...·]4-6">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">1997</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">279 ·························</span><span·class="p"·data-group-id="6677775214-6">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="6677775214-7">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><span[·...·truncated·by·diffoscope;·len:·263,·SHA:·d048b42d074dd474bc2e4e999203343fc12531635d2ca4f06b5e9e1b4b8c4473·...·]4-6">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="mi">1997</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">
280 ······························</span><span·class="p"·data-group-id="7270420424-8">{</span><span·class="ss">inventory</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p"·data-group-id="7270420424-8">}</span><span·class="p">;</span><span·class="w">280 ······························</span><span·class="p"·data-group-id="6677775214-8">{</span><span·class="ss">inventory</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p"·data-group-id="6677775214-8">}</span><span·class="p">;</span><span·class="w">
281 ·························</span><span·class="p"·data-group-id="7270420424-9">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="7270420424-10">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><spa[·...·truncated·by·diffoscope;·len:·265,·SHA:·b0156bbd3cfd396a22a71f3c76023729146f5a88987104afe0f750bbc9c9c0c3·...·]4-9">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">2001</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">281 ·························</span><span·class="p"·data-group-id="6677775214-9">(</span><span·class="o">#</span><span·class="ss">emp</span><span·class="p"·data-group-id="6677775214-10">{</span><span·class="ss">empno</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">E</span><spa[·...·truncated·by·diffoscope;·len:·265,·SHA:·ca479a2553a293b77bd4f9a6b7028c94e501be83970a2ec78ee47a9afa852e4a·...·]4-9">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">2001</span><span·class="w">··</span><span·class="p">-&gt;</span><span·class="w">
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159 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">159 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">
160 ····<i·class="ri-link-m"·aria-hidden="true"></i>160 ····<i·class="ri-link-m"·aria-hidden="true"></i>
161 ··</a>161 ··</a>
162 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>162 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>
163 </h3>163 </h3>
164 <ul><li><p>Made·it·possible·to·expand·help·text·displayed·by·pressing·^[h·by·pressing·^[h·again.</p><p>Own·Id:·OTP-19260·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8884"·title="">PR-8884</a></p></li><li><p>Defining·a·fun·in·the·shell·using·the·syntax·<code·class="inline">fun·Name/Arity</code>·would·fail.·This·has·been·corrected·so·that·the·following·now·works:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nb">is_atom</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">164 <ul><li><p>Made·it·possible·to·expand·help·text·displayed·by·pressing·^[h·by·pressing·^[h·again.</p><p>Own·Id:·OTP-19260·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8884"·title="">PR-8884</a></p></li><li><p>Defining·a·fun·in·the·shell·using·the·syntax·<code·class="inline">fun·Name/Arity</code>·would·fail.·This·has·been·corrected·so·that·the·following·now·works:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">F</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="nb">is_atom</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">165 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">
166 &gt;·</span><span·class="n">F</span><span·class="p"·data-group-id="8530186388-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="8530186388-1">)</span><span·class="p">.</span><span·class="w">166 &gt;·</span><span·class="n">F</span><span·class="p"·data-group-id="4781241379-1">(</span><span·class="ss">a</span><span·class="p"·data-group-id="4781241379-1">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="ss">true</span><span·class="gp·unselectable">167 </span><span·class="ss">true</span><span·class="gp·unselectable">
168 3&gt;·</span><span·class="n">Id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">id</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">168 3&gt;·</span><span·class="n">Id</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">id</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">.</span><span·class="w">
169 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">169 </span><span·class="p">#</span><span·class="n">Fun</span><span·class="p">.</span><span·class="ss">erl</span><span·class="p">.</span><span·class="mf">42.18682967</span><span·class="o">&gt;</span><span·class="gp·unselectable">
170 4&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="8530186388-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="8530186388-2">)</span><span·class="p">.</span><span·class="w">170 4&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="4781241379-2">(</span><span·class="mi">42</span><span·class="p"·data-group-id="4781241379-2">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="gt">**·exception·error:·undefined·shell·command·id/1</span><span·class="gp·unselectable">171 </span><span·class="gt">**·exception·error:·undefined·shell·command·id/1</span><span·class="gp·unselectable">
172 5&gt;·</span><span·class="nf">id</span><span·class="p"·data-group-id="8530186388-3">(</span><span·class="n">I</span><span·class="p"·data-group-id="8530186388-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">I</span><span·class="p">.</span><span·class="w">172 5&gt;·</span><span·class="nf">id</span><span·class="p"·data-group-id="4781241379-3">(</span><span·class="n">I</span><span·class="p"·data-group-id="4781241379-3">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">I</span><span·class="p">.</span><span·class="w">
173 </span><span·class="ss">ok</span><span·class="gp·unselectable">173 </span><span·class="ss">ok</span><span·class="gp·unselectable">
174 6&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="8530186388-4">(</span><span·class="mi">42</span><span·class="p"·data-group-id="8530186388-4">)</span><span·class="p">.</span><span·class="w">174 6&gt;·</span><span·class="n">Id</span><span·class="p"·data-group-id="4781241379-4">(</span><span·class="mi">42</span><span·class="p"·data-group-id="4781241379-4">)</span><span·class="p">.</span><span·class="w">
175 </span><span·class="mi">42</span></code></pre><p>The·Debugger·has·also·been·corrected·to·correctly·handle·this·syntax·for·a·BIF.</p><p>Own·Id:·OTP-19322·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8963"·title="">GH-8963</a>,·<a·href="https://github.com/erlang/otp/pull/8987"·title="">PR-8987</a></p></li><li><p>Fixed·a·bug·where·completion·of·'fun('·would·cause·the·shell·to·crash.</p><p>Own·Id:·OTP-19351·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9043"·title="">PR-9043</a></p></li><li><p>Fixed·a·bug·causing·the·shell·to·crash·while·trying·to·complete·an·expression·starting·with·a·'/'·or·a·variable·followed·by·'('·or·'/'.·E.g.·Foo/·and·Foo(.</p><p>Own·Id:·OTP-19361·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9078"·title="">PR-9078</a></p></li><li><p><a·href="zip.html#extract/2"><code·class="inline">zip:extract/2</code></a>·with·<code·class="inline">keep_old_files</code>·now·respects·the·<code·class="inline">cwd</code>·option.</p><p>Own·Id:·OTP-19370·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9097"·title="">PR-9097</a>,·<a·href="https://github.com/erlang/otp/issues/9087"·title="">GH-9087</a></p></li><li><p>Fixed·an·error·in·uri_string:percent_decode·spec</p><p>Own·Id:·OTP-19380·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8755"·title="">GH-8755</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">175 </span><span·class="mi">42</span></code></pre><p>The·Debugger·has·also·been·corrected·to·correctly·handle·this·syntax·for·a·BIF.</p><p>Own·Id:·OTP-19322·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8963"·title="">GH-8963</a>,·<a·href="https://github.com/erlang/otp/pull/8987"·title="">PR-8987</a></p></li><li><p>Fixed·a·bug·where·completion·of·'fun('·would·cause·the·shell·to·crash.</p><p>Own·Id:·OTP-19351·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9043"·title="">PR-9043</a></p></li><li><p>Fixed·a·bug·causing·the·shell·to·crash·while·trying·to·complete·an·expression·starting·with·a·'/'·or·a·variable·followed·by·'('·or·'/'.·E.g.·Foo/·and·Foo(.</p><p>Own·Id:·OTP-19361·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9078"·title="">PR-9078</a></p></li><li><p><a·href="zip.html#extract/2"><code·class="inline">zip:extract/2</code></a>·with·<code·class="inline">keep_old_files</code>·now·respects·the·<code·class="inline">cwd</code>·option.</p><p>Own·Id:·OTP-19370·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/9097"·title="">PR-9097</a>,·<a·href="https://github.com/erlang/otp/issues/9087"·title="">GH-9087</a></p></li><li><p>Fixed·an·error·in·uri_string:percent_decode·spec</p><p>Own·Id:·OTP-19380·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8755"·title="">GH-8755</a></p></li></ul><h3·id="improvements-and-new-features"·class="section-heading">
176 ··<a·href="#improvements-and-new-features"·class="hover-link">176 ··<a·href="#improvements-and-new-features"·class="hover-link">
177 ····<i·class="ri-link-m"·aria-hidden="true"></i>177 ····<i·class="ri-link-m"·aria-hidden="true"></i>
178 ··</a>178 ··</a>
179 ··<span·class="text">Improvements·and·New·Features</span>179 ··<span·class="text">Improvements·and·New·Features</span>
180 </h3>180 </h3>
181 <ul><li><p>Updated·shell·docs·to·display·the·type·spec,·that·is,·<code·class="inline">h(erlang,·min,·2)</code>)·now·prints·the·type·spec·and·documentation·in·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">h</span><span·class="p"·data-group-id="0431997075-1">(</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="ss">min</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="0431997075-1">)</span><span·class="p">.</span><span·class="w">181 <ul><li><p>Updated·shell·docs·to·display·the·type·spec,·that·is,·<code·class="inline">h(erlang,·min,·2)</code>)·now·prints·the·type·spec·and·documentation·in·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="nf">h</span><span·class="p"·data-group-id="1154690398-1">(</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="ss">min</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1154690398-1">)</span><span·class="p">.</span><span·class="w">
182 </span><span·class="w">182 </span><span·class="w">
183 ··</span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">min</span><span·class="p"·data-group-id="0431997075-2">(</span><span·class="n">Term1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Term2</span><span·class="p"·data-group-id="0431997075-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Minimum</span><span·class="w">183 ··</span><span·class="p">-</span><span·class="na">spec</span><span·class="w">·</span><span·class="nf">min</span><span·class="p"·data-group-id="1154690398-2">(</span><span·class="n">Term1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Term2</span><span·class="p"·data-group-id="1154690398-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Minimum</span><span·class="w">
184 ···············</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Term1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="0431997075-3">(</span><span·class="p"·data-group-id="0431997075-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Term2</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·421,·SHA:·9bc4e2ab17c4196a9b6fe1f83dceee380e8a80b74eaad891eae7eab6d1918494·...·]-5">)</span><span·class="p">.</span><span·class="w">184 ···············</span><span·class="k">when</span><span·class="w">·</span><span·class="n">Term1</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">term</span><span·class="p"·data-group-id="1154690398-3">(</span><span·class="p"·data-group-id="1154690398-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Term2</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·421,·SHA:·21fb39bd9ffdd3ac01d1ddd44d8032c5dd1efd9f2dbdd9f6e5e797161bf371c5·...·]-5">)</span><span·class="p">.</span><span·class="w">
  
185 ··</span><span·class="n">Returns</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">smallest</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="n">Term1</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">Term2</span><span·class="p">.</span><span·class="w">·</span><span·class="n">If</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">terms</span><span·class="w">·</span><span·class="ss">compare</span><span·class="w">·</span><span·class="ss">equal</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="ss">operator</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Term1</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">returned</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-19234·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8544"·title="">GH-8544</a>,·<a·href="https://github.com/erlang/otp/pull/8833"·title="">PR-8833</a></p></li><li><p>The·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:io_device/0"><code·class="inline">file:io_device/0</code></a>·type·has·been·updated·to·clearly·show·the·difference·between·a·<code·class="inline">raw</code>·and·<code·class="inline">cooked</code>·IoDevice.</p><p>Own·Id:·OTP-19301·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8956"·title="">PR-8956</a></p></li><li><p>Added·<a·href="json.html#format_key_value_list/3"><code·class="inline">json:format_key_value_list/3</code></a>·and185 ··</span><span·class="n">Returns</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">smallest</span><span·class="w">·</span><span·class="k">of</span><span·class="w">·</span><span·class="n">Term1</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">Term2</span><span·class="p">.</span><span·class="w">·</span><span·class="n">If</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="ss">terms</span><span·class="w">·</span><span·class="ss">compare</span><span·class="w">·</span><span·class="ss">equal</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="ss">the</span><span·class="w">·</span><span·class="o">==</span><span·class="w">·</span><span·class="ss">operator</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Term1</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">returned</span><span·class="p">.</span></code></pre><p>Own·Id:·OTP-19234·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8544"·title="">GH-8544</a>,·<a·href="https://github.com/erlang/otp/pull/8833"·title="">PR-8833</a></p></li><li><p>The·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#t:io_device/0"><code·class="inline">file:io_device/0</code></a>·type·has·been·updated·to·clearly·show·the·difference·between·a·<code·class="inline">raw</code>·and·<code·class="inline">cooked</code>·IoDevice.</p><p>Own·Id:·OTP-19301·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8956"·title="">PR-8956</a></p></li><li><p>Added·<a·href="json.html#format_key_value_list/3"><code·class="inline">json:format_key_value_list/3</code></a>·and
186 <a·href="json.html#format_key_value_list_checked/3"><code·class="inline">json:format_key_value_list_checked/3</code></a>.</p><p>Own·Id:·OTP-19320·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8889"·title="">PR-8889</a></p></li><li><p>Improved·documentation·of·<a·href="../../../../erts-15.2.6/doc/html/time_correction.html#timers">timers</a>.</p><p>Own·Id:·OTP-19360·Aux·Id:·ERIERL-1149,·<a·href="https://github.com/erlang/otp/pull/9062"·title="">PR-9062</a></p></li><li><p>Added·logging·support·to·<a·href="io.html#t:user/0"><code·class="inline">io:user/0</code></a>,·<a·href="io.html#t:standard_io/0"><code·class="inline">io:standard_io/0</code></a>·and·<a·href="io.html#t:standard_error/0"><code·class="inline">io:standard_error/0</code></a>.·See·<a·href="io.html#setopts/2"><code·class="inline">io:setopts/2</code></a>·for·more·details.</p><p>Own·Id:·OTP-19372·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8947"·title="">PR-8947</a></p></li></ul><h2·id="stdlib-6-1-2"·class="section-heading">186 <a·href="json.html#format_key_value_list_checked/3"><code·class="inline">json:format_key_value_list_checked/3</code></a>.</p><p>Own·Id:·OTP-19320·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8889"·title="">PR-8889</a></p></li><li><p>Improved·documentation·of·<a·href="../../../../erts-15.2.6/doc/html/time_correction.html#timers">timers</a>.</p><p>Own·Id:·OTP-19360·Aux·Id:·ERIERL-1149,·<a·href="https://github.com/erlang/otp/pull/9062"·title="">PR-9062</a></p></li><li><p>Added·logging·support·to·<a·href="io.html#t:user/0"><code·class="inline">io:user/0</code></a>,·<a·href="io.html#t:standard_io/0"><code·class="inline">io:standard_io/0</code></a>·and·<a·href="io.html#t:standard_error/0"><code·class="inline">io:standard_error/0</code></a>.·See·<a·href="io.html#setopts/2"><code·class="inline">io:setopts/2</code></a>·for·more·details.</p><p>Own·Id:·OTP-19372·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8947"·title="">PR-8947</a></p></li></ul><h2·id="stdlib-6-1-2"·class="section-heading">
187 ··<a·href="#stdlib-6-1-2"·class="hover-link">187 ··<a·href="#stdlib-6-1-2"·class="hover-link">
188 ····<i·class="ri-link-m"·aria-hidden="true"></i>188 ····<i·class="ri-link-m"·aria-hidden="true"></i>
189 ··</a>189 ··</a>
190 ··<span·class="text">STDLIB·6.1.2</span>190 ··<span·class="text">STDLIB·6.1.2</span>
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257 <a·href="binary.html#split/2"><code·class="inline">binary:split/2,3</code></a></p><p>The·call·<code·class="inline">binary:copy(&lt;&lt;1:1&gt;&gt;,·0)</code>·would·return·an·empty·binary·instead·of·raising·an·exception.·Similarly,·calls·to·<a·href="binary.html#part/2"><code·class="inline">binary:part/2,3</code></a>·attempting·to·extract·0·bytes·at·position·0·of·a·bitstring·would·return·an·empty·binary·instead·of·raising·an·exception.</p><p>Own·Id:·OTP-18743·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7607"·title="">PR-7607</a>,·<a·href="https://github.com/erlang/otp/pull/7628"·title="">PR-7628</a></p></li><li><p>The·documentation·for·the·preprocessor·now·mentions·that·<code·class="inline">defined(Name)</code>·can·be·called·in·the·condition·for·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·directive·to·test·whether·<code·class="inline">Name</code>·is·the·name·of·a·defined·macro.·(This·feature·was·implemented·in·OTP·21.)</p><p>If·a·function·call·in·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·with·a·name·that·is·not·the·name·of·a·guard·BIF,·there·would·not·be·a·compilation·error,·but·would·instead·cause·the·lines·following·the·directive·to·be·skipped.·This·has·now·been·changed·to·be·a·compilation·error.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18784·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/7706"·title="">GH-7706</a>,·<a·href="https://github.com/erlang/otp/pull/7726"·title="">PR-7726</a></p></li><li><p><code·class="inline">get_until</code>·requests·using·the·I/O·protocol·now·correctly·return·a·binary·or·list·when·<code·class="inline">eof</code>·is·the·last·item·returned·by·the·callback.</p><p>Own·Id:·OTP-18930·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7993"·title="">PR-7993</a>,·<a·href="https://github.com/erlang/otp/issues/4992"·title="">GH-4992</a></p></li><li><p>The·error·handling·the·<code·class="inline">simple_one_for_one</code>·supervisor·has·been·enhanced.·A·transient·child·returning·<code·class="inline">ignore</code>·will·no·longer·cause·a·crash.</p><p>Also,·automatic·shutdown·has·been·disabled·because·it·does·not·make·sense·for·this·supervisor·type.·That·is·was·allowed·is·considered·a·bug.·Therefore,·we·don't·consider·this·an·incompatible·change.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-19029·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8230"·title="">PR-8230</a></p></li><li><p>Fix·shell·expansion·to·not·crash·when·expanding·a·map·with·non-atom·keys·and·to·not·list·zero·arity·functions·when·an·argument·has·been·given.</p><p>Own·Id:·OTP-19073·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8375"·title="">PR-8375</a>,·<a·href="https://github.com/erlang/otp/issues/8366"·title="">GH-8366</a>,·<a·href="https://github.com/erlang/otp/issues/8365"·title="">GH-8365</a>,·<a·href="https://github.com/erlang/otp/issues/8364"·title="">GH-8364</a></p></li></ul><h3·id="improvements-and-new-features-2"·class="section-heading">257 <a·href="binary.html#split/2"><code·class="inline">binary:split/2,3</code></a></p><p>The·call·<code·class="inline">binary:copy(&lt;&lt;1:1&gt;&gt;,·0)</code>·would·return·an·empty·binary·instead·of·raising·an·exception.·Similarly,·calls·to·<a·href="binary.html#part/2"><code·class="inline">binary:part/2,3</code></a>·attempting·to·extract·0·bytes·at·position·0·of·a·bitstring·would·return·an·empty·binary·instead·of·raising·an·exception.</p><p>Own·Id:·OTP-18743·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7607"·title="">PR-7607</a>,·<a·href="https://github.com/erlang/otp/pull/7628"·title="">PR-7628</a></p></li><li><p>The·documentation·for·the·preprocessor·now·mentions·that·<code·class="inline">defined(Name)</code>·can·be·called·in·the·condition·for·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·directive·to·test·whether·<code·class="inline">Name</code>·is·the·name·of·a·defined·macro.·(This·feature·was·implemented·in·OTP·21.)</p><p>If·a·function·call·in·an·<code·class="inline">-if</code>·or·<code·class="inline">-elif</code>·with·a·name·that·is·not·the·name·of·a·guard·BIF,·there·would·not·be·a·compilation·error,·but·would·instead·cause·the·lines·following·the·directive·to·be·skipped.·This·has·now·been·changed·to·be·a·compilation·error.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18784·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/7706"·title="">GH-7706</a>,·<a·href="https://github.com/erlang/otp/pull/7726"·title="">PR-7726</a></p></li><li><p><code·class="inline">get_until</code>·requests·using·the·I/O·protocol·now·correctly·return·a·binary·or·list·when·<code·class="inline">eof</code>·is·the·last·item·returned·by·the·callback.</p><p>Own·Id:·OTP-18930·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7993"·title="">PR-7993</a>,·<a·href="https://github.com/erlang/otp/issues/4992"·title="">GH-4992</a></p></li><li><p>The·error·handling·the·<code·class="inline">simple_one_for_one</code>·supervisor·has·been·enhanced.·A·transient·child·returning·<code·class="inline">ignore</code>·will·no·longer·cause·a·crash.</p><p>Also,·automatic·shutdown·has·been·disabled·because·it·does·not·make·sense·for·this·supervisor·type.·That·is·was·allowed·is·considered·a·bug.·Therefore,·we·don't·consider·this·an·incompatible·change.</p><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-19029·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8230"·title="">PR-8230</a></p></li><li><p>Fix·shell·expansion·to·not·crash·when·expanding·a·map·with·non-atom·keys·and·to·not·list·zero·arity·functions·when·an·argument·has·been·given.</p><p>Own·Id:·OTP-19073·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8375"·title="">PR-8375</a>,·<a·href="https://github.com/erlang/otp/issues/8366"·title="">GH-8366</a>,·<a·href="https://github.com/erlang/otp/issues/8365"·title="">GH-8365</a>,·<a·href="https://github.com/erlang/otp/issues/8364"·title="">GH-8364</a></p></li></ul><h3·id="improvements-and-new-features-2"·class="section-heading">
258 ··<a·href="#improvements-and-new-features-2"·class="hover-link">258 ··<a·href="#improvements-and-new-features-2"·class="hover-link">
259 ····<i·class="ri-link-m"·aria-hidden="true"></i>259 ····<i·class="ri-link-m"·aria-hidden="true"></i>
260 ··</a>260 ··</a>
261 ··<span·class="text">Improvements·and·New·Features</span>261 ··<span·class="text">Improvements·and·New·Features</span>
262 </h3>262 </h3>
263 <ul><li><p>The·functions·<a·href="sets.html#is_equal/2"><code·class="inline">is_equal/2</code></a>,·<a·href="sets.html#map/2"><code·class="inline">map/2</code></a>,·and·<a·href="sets.html#filtermap/2"><code·class="inline">filtermap/2</code></a>·have·been·added·to·the·modules·<a·href="sets.html"><code·class="inline">sets</code></a>,·<a·href="ordsets.html"><code·class="inline">ordsets</code></a>,·and·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>.</p><p>Own·Id:·OTP-18622·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7183"·title="">PR-7183</a>,·<a·href="https://github.com/erlang/otp/pull/7232"·title="">PR-7232</a></p></li><li><p>The·compiler·now·emits·nicer·error·message·for·function·head·mismatches.263 <ul><li><p>The·functions·<a·href="sets.html#is_equal/2"><code·class="inline">is_equal/2</code></a>,·<a·href="sets.html#map/2"><code·class="inline">map/2</code></a>,·and·<a·href="sets.html#filtermap/2"><code·class="inline">filtermap/2</code></a>·have·been·added·to·the·modules·<a·href="sets.html"><code·class="inline">sets</code></a>,·<a·href="ordsets.html"><code·class="inline">ordsets</code></a>,·and·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>.</p><p>Own·Id:·OTP-18622·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7183"·title="">PR-7183</a>,·<a·href="https://github.com/erlang/otp/pull/7232"·title="">PR-7232</a></p></li><li><p>The·compiler·now·emits·nicer·error·message·for·function·head·mismatches.
264 For·example,·given:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">a</span><span·class="p"·data-group-id="7265760986-1">(</span><span·class="p"·data-group-id="7265760986-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">264 For·example,·given:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">a</span><span·class="p"·data-group-id="7914698891-1">(</span><span·class="p"·data-group-id="7914698891-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
265 </span><span·class="nf">a</span><span·class="p"·data-group-id="7265760986-2">(</span><span·class="p">_</span><span·class="p"·data-group-id="7265760986-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p>Erlang/OTP·26·and·earlier·would·emit·a·diagnostic·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch265 </span><span·class="nf">a</span><span·class="p"·data-group-id="7914698891-2">(</span><span·class="p">_</span><span·class="p"·data-group-id="7914698891-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">error</span><span·class="p">.</span></code></pre><p>Erlang/OTP·26·and·earlier·would·emit·a·diagnostic·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch
266 %····6|·a(_)·-&gt;·error.266 %····6|·a(_)·-&gt;·error.
267 %·····|·^</code></pre><p>while·in·Erlang/OTP·27·the·diagnostic·is·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch:·function·a·with·arities·0·and·1·is·regarded·as·two·distinct·functions.·Is·the·number·of·arguments·incorrect·or·is·the·semicolon·in·a/0·unwanted?267 %·····|·^</code></pre><p>while·in·Erlang/OTP·27·the·diagnostic·is·similar·to:</p><pre><code·class="text">t.erl:6:1:·head·mismatch:·function·a·with·arities·0·and·1·is·regarded·as·two·distinct·functions.·Is·the·number·of·arguments·incorrect·or·is·the·semicolon·in·a/0·unwanted?
268 %····6|·a(_)·-&gt;·error.268 %····6|·a(_)·-&gt;·error.
269 %·····|·^</code></pre><p>Own·Id:·OTP-18648·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7383"·title="">PR-7383</a></p></li><li><p><a·href="zip.html#create/2"><code·class="inline">zip:create/2,3</code></a>·will·now·tolerate·POSIX·timestamps·in·the·provided·<code·class="inline">file_info</code>·records.</p><p>Own·Id:·OTP-18668</p></li><li><p>The·callback·function·<a·href="gen_statem.html#c:handle_event/4"><code·class="inline">gen_statem:handle_event/4</code></a>·has·been·cached·in·the·<code·class="inline">gen_statem</code>·engine·to·optimize·callback·call·speed.</p><p>Own·Id:·OTP-18671·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7419"·title="">PR-7419</a></p></li><li><p>The·type·<code·class="inline">beam_lib:beam/0</code>·is·now·exported.</p><p>Own·Id:·OTP-18716·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7534"·title="">PR-7534</a></p></li><li><p>The·documentation·for·the·<a·href="binary.html"><code·class="inline">binary</code></a>·module·has·been·improved.</p><p>Own·Id:·OTP-18741·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7585"·title="">PR-7585</a></p></li><li><p><a·href="binary.html#replace/3"><code·class="inline">binary:replace/3,4</code></a>·now·supports·using·a·fun·for·supplying·the·replacement·binary.</p><p>Own·Id:·OTP-18742·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7590"·title="">PR-7590</a></p></li><li><p>Triple-Quoted·Strings·has·been·implemented·as·per·<a·href="https://www.erlang.org/eeps/eep-0064">EEP·64</a>.·See·<a·href="../../../../doc/system/data_types.html#string">String</a>·in·the·Reference·Manual.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;269 %·····|·^</code></pre><p>Own·Id:·OTP-18648·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7383"·title="">PR-7383</a></p></li><li><p><a·href="zip.html#create/2"><code·class="inline">zip:create/2,3</code></a>·will·now·tolerate·POSIX·timestamps·in·the·provided·<code·class="inline">file_info</code>·records.</p><p>Own·Id:·OTP-18668</p></li><li><p>The·callback·function·<a·href="gen_statem.html#c:handle_event/4"><code·class="inline">gen_statem:handle_event/4</code></a>·has·been·cached·in·the·<code·class="inline">gen_statem</code>·engine·to·optimize·callback·call·speed.</p><p>Own·Id:·OTP-18671·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7419"·title="">PR-7419</a></p></li><li><p>The·type·<code·class="inline">beam_lib:beam/0</code>·is·now·exported.</p><p>Own·Id:·OTP-18716·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7534"·title="">PR-7534</a></p></li><li><p>The·documentation·for·the·<a·href="binary.html"><code·class="inline">binary</code></a>·module·has·been·improved.</p><p>Own·Id:·OTP-18741·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7585"·title="">PR-7585</a></p></li><li><p><a·href="binary.html#replace/3"><code·class="inline">binary:replace/3,4</code></a>·now·supports·using·a·fun·for·supplying·the·replacement·binary.</p><p>Own·Id:·OTP-18742·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7590"·title="">PR-7590</a></p></li><li><p>Triple-Quoted·Strings·has·been·implemented·as·per·<a·href="https://www.erlang.org/eeps/eep-0064">EEP·64</a>.·See·<a·href="../../../../doc/system/data_types.html#string">String</a>·in·the·Reference·Manual.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;
270 ···a270 ···a
271 ···b271 ···b
272 ···c272 ···c
Offset 281, 30 lines modifiedOffset 281, 30 lines modified
281 ····.281 ····.
282 ····.282 ····.
283 ····.283 ····.
284 &lt;0.90.0&gt;··············erlang:apply/2························2586····75011····0284 &lt;0.90.0&gt;··············erlang:apply/2························2586····75011····0
285 my_label··············c:pinfo/2·······························51285 my_label··············c:pinfo/2·······························51
286 4&gt;·proc_lib:get_label(self()).286 4&gt;·proc_lib:get_label(self()).
287 my_label</code></pre><p>Own·Id:·OTP-18789·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7720"·title="">PR-7720</a>,·<a·href="https://github.com/erlang/otp/pull/8003"·title="">PR-8003</a></p></li><li><p><code·class="inline">-callback</code>·attributes·has·been·added·to·modules·<a·href="sys.html"><code·class="inline">sys</code></a>·and·<a·href="erl_error.html"><code·class="inline">erl_error</code></a>.</p><p>Own·Id:·OTP-18793·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7703"·title="">PR-7703</a></p></li><li><p>Several·new·functions·that·accept·funs·have·been·added·to·module·<a·href="timer.html"><code·class="inline">timer</code></a>.</p><p>Functions·<a·href="timer.html#apply_after/2"><code·class="inline">apply_after/2</code></a>,·<a·href="timer.html#apply_interval/2"><code·class="inline">apply_interval/2</code></a>,·and·<code·class="inline">apply_repeatedly/2</code>·accept·a·nullary·fun·as·the·second·argument,·while··functions·<a·href="timer.html#apply_after/3"><code·class="inline">apply_after/3</code></a>,·<a·href="timer.html#apply_interval/3"><code·class="inline">apply_interval/3</code></a>,·and·<code·class="inline">apply_repeatedly/3</code>·accept·an·n-ary·fun·as·the·second·and·a·list·of·n·arguments·for·the·fun·as·the·third·argument.</p><p>Own·Id:·OTP-18808·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7649"·title="">PR-7649</a></p></li><li><p>Sigils·on·string·literals·have·been·implemented·as·per·<a·href="https://www.erlang.org/eeps/eep-0066">EEP·66</a>,·that·is:·binary·and·string·sigils·in·verbatim·and·escape·characters·variants,·as·well·as·a·default·(vanilla)·Sigil.··All·for·ordinary·strings·and·for·triple-quoted·strings·(EEP·64).·See·<a·href="../../../../doc/system/data_types.html#sigil">Sigils·in·the·Reference·Manual</a>.</p><p>Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">~&quot;Björn&quot;</span><span·class="p">.</span><span·class="w">287 my_label</code></pre><p>Own·Id:·OTP-18789·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7720"·title="">PR-7720</a>,·<a·href="https://github.com/erlang/otp/pull/8003"·title="">PR-8003</a></p></li><li><p><code·class="inline">-callback</code>·attributes·has·been·added·to·modules·<a·href="sys.html"><code·class="inline">sys</code></a>·and·<a·href="erl_error.html"><code·class="inline">erl_error</code></a>.</p><p>Own·Id:·OTP-18793·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7703"·title="">PR-7703</a></p></li><li><p>Several·new·functions·that·accept·funs·have·been·added·to·module·<a·href="timer.html"><code·class="inline">timer</code></a>.</p><p>Functions·<a·href="timer.html#apply_after/2"><code·class="inline">apply_after/2</code></a>,·<a·href="timer.html#apply_interval/2"><code·class="inline">apply_interval/2</code></a>,·and·<code·class="inline">apply_repeatedly/2</code>·accept·a·nullary·fun·as·the·second·argument,·while··functions·<a·href="timer.html#apply_after/3"><code·class="inline">apply_after/3</code></a>,·<a·href="timer.html#apply_interval/3"><code·class="inline">apply_interval/3</code></a>,·and·<code·class="inline">apply_repeatedly/3</code>·accept·an·n-ary·fun·as·the·second·and·a·list·of·n·arguments·for·the·fun·as·the·third·argument.</p><p>Own·Id:·OTP-18808·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7649"·title="">PR-7649</a></p></li><li><p>Sigils·on·string·literals·have·been·implemented·as·per·<a·href="https://www.erlang.org/eeps/eep-0066">EEP·66</a>,·that·is:·binary·and·string·sigils·in·verbatim·and·escape·characters·variants,·as·well·as·a·default·(vanilla)·Sigil.··All·for·ordinary·strings·and·for·triple-quoted·strings·(EEP·64).·See·<a·href="../../../../doc/system/data_types.html#sigil">Sigils·in·the·Reference·Manual</a>.</p><p>Examples:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">~&quot;Björn&quot;</span><span·class="p">.</span><span·class="w">
288 </span><span·class="p"·data-group-id="4186159165-1">&lt;&lt;</span><span·class="s">&quot;Björn&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="4186159165-1">&gt;&gt;</span><span·class="gp·unselectable">288 </span><span·class="p"·data-group-id="9439983042-1">&lt;&lt;</span><span·class="s">&quot;Björn&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="9439983042-1">&gt;&gt;</span><span·class="gp·unselectable">
289 2&gt;·</span><span·class="s">~b&quot;Björn&quot;</span><span·class="p">.</span><span·class="w">289 2&gt;·</span><span·class="s">~b&quot;Björn&quot;</span><span·class="p">.</span><span·class="w">
290 </span><span·class="p"·data-group-id="4186159165-2">&lt;&lt;</span><span·class="s">&quot;Björn&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="4186159165-2">&gt;&gt;</span><span·class="gp·unselectable">290 </span><span·class="p"·data-group-id="9439983042-2">&lt;&lt;</span><span·class="s">&quot;Björn&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="9439983042-2">&gt;&gt;</span><span·class="gp·unselectable">
291 3&gt;·</span><span·class="s">~S&quot;\s*(\w+)&quot;</span><span·class="p">.</span><span·class="w">291 3&gt;·</span><span·class="s">~S&quot;\s*(\w+)&quot;</span><span·class="p">.</span><span·class="w">
292 </span><span·class="s">&quot;\\s*(\\w+)&quot;</span><span·class="gp·unselectable">292 </span><span·class="s">&quot;\\s*(\\w+)&quot;</span><span·class="gp·unselectable">
293 4&gt;·</span><span·class="s">~B&quot;\s*(\w+)&quot;</span><span·class="p">.</span><span·class="w">293 4&gt;·</span><span·class="s">~B&quot;\s*(\w+)&quot;</span><span·class="p">.</span><span·class="w">
294 </span><span·class="p"·data-group-id="4186159165-3">&lt;&lt;</span><span·class="s">&quot;\\s*(\\w+)&quot;</span><span·class="p"·data-group-id="4186159165-3">&gt;&gt;</span></code></pre><p>Own·Id:·OTP-18825·Aux·Id:·OTP-18750,·<a·href="https://github.com/erlang/otp/pull/7684"·title="">PR-7684</a></p></li><li><p>Functions·<a·href="shell.html#default_multiline_prompt/1"><code·class="inline">shell:default_multiline_prompt/1</code></a>,·<a·href="shell.html#inverted_space_prompt/1"><code·class="inline">shell:inverted_space_prompt/1</code></a>,·and·294 </span><span·class="p"·data-group-id="9439983042-3">&lt;&lt;</span><span·class="s">&quot;\\s*(\\w+)&quot;</span><span·class="p"·data-group-id="9439983042-3">&gt;&gt;</span></code></pre><p>Own·Id:·OTP-18825·Aux·Id:·OTP-18750,·<a·href="https://github.com/erlang/otp/pull/7684"·title="">PR-7684</a></p></li><li><p>Functions·<a·href="shell.html#default_multiline_prompt/1"><code·class="inline">shell:default_multiline_prompt/1</code></a>,·<a·href="shell.html#inverted_space_prompt/1"><code·class="inline">shell:inverted_space_prompt/1</code></a>,·and·
295 <a·href="shell.html#prompt_width/1"><code·class="inline">shell:prompt_width/1</code></a>·have·been·exported·to·help·with·custom·prompt·implementations.</p><p>Own·Id:·OTP-18834·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7675"·title="">PR-7675</a>,·<a·href="https://github.com/erlang/otp/pull/7816"·title="">PR-7816</a></p></li><li><p>The·shell·now·pages·long·output·from·the·documentation·help·command·(<code·class="inline">h(Module)</code>),·auto·completions·and·the·search·command.</p><p>Own·Id:·OTP-18846·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7845"·title="">PR-7845</a></p></li><li><p>The·<code·class="inline">M-h</code>·hotkey·(Alt/Option-h)·now·outputs·help·for·the·module·or·function·directly·before·the·cursor.</p><p>Own·Id:·OTP-18847·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7846"·title="">PR-7846</a></p></li><li><p>Added·support·for·adding·a·custom·code·formatter·that·formats·your·multi-line·shell·commands·in·your·preferred·formatting·on·submission.·See·<code·class="inline">shell:format_shell_func/</code>·and·<a·href="shell.html#erl_pp_format_func/1"><code·class="inline">shell:erl_pp_format_func/1</code></a>.</p><p>Own·Id:·OTP-18848·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7847"·title="">PR-7847</a></p></li><li><p>Added·shell·functions·for·viewing,·forgetting·and·saving·locally·defined·functions,·types·and·records.</p><p>Own·Id:·OTP-18852·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7844"·title="">PR-7844</a></p></li><li><p>Added·<a·href="string.html#jaro_similarity/2"><code·class="inline">string:jaro_similarity/2</code></a>,·which·can·be·used·to·calculate·the·similarity·between·two·strings.</p><p>Own·Id:·OTP-18865·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7879"·title="">PR-7879</a></p></li><li><p>The·new·function·<a·href="ets.html#update_element/4"><code·class="inline">ets:update_element/4</code></a>·is·similar·to·<a·href="ets.html#update_element/3"><code·class="inline">ets:update_element/3</code></a>,·but·takes·a·default·tuple·as·the·fourth·argument,·which·will·be·inserted·if·no·previous·record·with·that·key·exists.</p><p>Own·Id:·OTP-18870·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7857"·title="">PR-7857</a></p></li><li><p>Added·functions·to·retrieve·the·next·higher·or·lower·key/element·from·<a·href="gb_trees.html"><code·class="inline">gb_trees</code></a>·and·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>,·as·well·as·returning·iterators·that·start·at·given·keys/elements.</p><p>Own·Id:·OTP-18874·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7745"·title="">PR-7745</a></p></li><li><p>When·the·shell·built-in·function·<a·href="c.html#c/1"·title=""><code·class="inline">c/1,2</code></a>·is·used·to·re-compile·a·module,·the·current·working·directory·of·the·original·compilation·is·now·added·to·the·include·path.</p><p>Own·Id:·OTP-18908·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7957"·title="">PR-7957</a></p></li><li><p>The·<code·class="inline">timer</code>·module·now·uses·a·private·table·for·its·internal·state,·slightly·improving·its·performance.</p><p>Own·Id:·OTP-18914·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7973"·title="">PR-7973</a></p></li><li><p><a·href="https://www.erlang.org/eeps/eep-0059">EEP-59·-·Documentation·Attributes</a>·has·been·implemented.</p><p>Documentation·attributes·can·be·used·to·document·functions,·types,·callbacks,·and·modules.295 <a·href="shell.html#prompt_width/1"><code·class="inline">shell:prompt_width/1</code></a>·have·been·exported·to·help·with·custom·prompt·implementations.</p><p>Own·Id:·OTP-18834·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7675"·title="">PR-7675</a>,·<a·href="https://github.com/erlang/otp/pull/7816"·title="">PR-7816</a></p></li><li><p>The·shell·now·pages·long·output·from·the·documentation·help·command·(<code·class="inline">h(Module)</code>),·auto·completions·and·the·search·command.</p><p>Own·Id:·OTP-18846·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7845"·title="">PR-7845</a></p></li><li><p>The·<code·class="inline">M-h</code>·hotkey·(Alt/Option-h)·now·outputs·help·for·the·module·or·function·directly·before·the·cursor.</p><p>Own·Id:·OTP-18847·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7846"·title="">PR-7846</a></p></li><li><p>Added·support·for·adding·a·custom·code·formatter·that·formats·your·multi-line·shell·commands·in·your·preferred·formatting·on·submission.·See·<code·class="inline">shell:format_shell_func/</code>·and·<a·href="shell.html#erl_pp_format_func/1"><code·class="inline">shell:erl_pp_format_func/1</code></a>.</p><p>Own·Id:·OTP-18848·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7847"·title="">PR-7847</a></p></li><li><p>Added·shell·functions·for·viewing,·forgetting·and·saving·locally·defined·functions,·types·and·records.</p><p>Own·Id:·OTP-18852·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7844"·title="">PR-7844</a></p></li><li><p>Added·<a·href="string.html#jaro_similarity/2"><code·class="inline">string:jaro_similarity/2</code></a>,·which·can·be·used·to·calculate·the·similarity·between·two·strings.</p><p>Own·Id:·OTP-18865·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7879"·title="">PR-7879</a></p></li><li><p>The·new·function·<a·href="ets.html#update_element/4"><code·class="inline">ets:update_element/4</code></a>·is·similar·to·<a·href="ets.html#update_element/3"><code·class="inline">ets:update_element/3</code></a>,·but·takes·a·default·tuple·as·the·fourth·argument,·which·will·be·inserted·if·no·previous·record·with·that·key·exists.</p><p>Own·Id:·OTP-18870·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7857"·title="">PR-7857</a></p></li><li><p>Added·functions·to·retrieve·the·next·higher·or·lower·key/element·from·<a·href="gb_trees.html"><code·class="inline">gb_trees</code></a>·and·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>,·as·well·as·returning·iterators·that·start·at·given·keys/elements.</p><p>Own·Id:·OTP-18874·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7745"·title="">PR-7745</a></p></li><li><p>When·the·shell·built-in·function·<a·href="c.html#c/1"·title=""><code·class="inline">c/1,2</code></a>·is·used·to·re-compile·a·module,·the·current·working·directory·of·the·original·compilation·is·now·added·to·the·include·path.</p><p>Own·Id:·OTP-18908·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7957"·title="">PR-7957</a></p></li><li><p>The·<code·class="inline">timer</code>·module·now·uses·a·private·table·for·its·internal·state,·slightly·improving·its·performance.</p><p>Own·Id:·OTP-18914·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7973"·title="">PR-7973</a></p></li><li><p><a·href="https://www.erlang.org/eeps/eep-0059">EEP-59·-·Documentation·Attributes</a>·has·been·implemented.</p><p>Documentation·attributes·can·be·used·to·document·functions,·types,·callbacks,·and·modules.
296 The·keyword·<code·class="inline">-moduledoc·&quot;Documentation·here&quot;.</code>·is·used·to·document·modules,·while·<code·class="inline">-doc·&quot;Documentation·here&quot;.</code>·can·be·used·on·top·of·functions,·types,·and·callbacks·to·document·them,·respectively.</p><ul><li><p>Types,·callbacks,·and·function·documentation·can·be·set·to·<code·class="inline">hidden</code>·either·via·<code·class="inline">-doc·false</code>·or·<code·class="inline">-doc·hidden</code>.·When·documentation·attributes·mark·a·type·as·hidden,·they·will·not·be·part·of·the·documentation.</p></li><li><p>The·documentation·from·<code·class="inline">moduledoc</code>·and·<code·class="inline">doc</code>·gets·added·by·default·to·the·binary·beam·file,·following·the·format·of·<a·href="https://www.erlang.org/eeps/eep-0048">EEP-48</a>.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_doc</code>·will·raise·a·warning·when296 The·keyword·<code·class="inline">-moduledoc·&quot;Documentation·here&quot;.</code>·is·used·to·document·modules,·while·<code·class="inline">-doc·&quot;Documentation·here&quot;.</code>·can·be·used·on·top·of·functions,·types,·and·callbacks·to·document·them,·respectively.</p><ul><li><p>Types,·callbacks,·and·function·documentation·can·be·set·to·<code·class="inline">hidden</code>·either·via·<code·class="inline">-doc·false</code>·or·<code·class="inline">-doc·hidden</code>.·When·documentation·attributes·mark·a·type·as·hidden,·they·will·not·be·part·of·the·documentation.</p></li><li><p>The·documentation·from·<code·class="inline">moduledoc</code>·and·<code·class="inline">doc</code>·gets·added·by·default·to·the·binary·beam·file,·following·the·format·of·<a·href="https://www.erlang.org/eeps/eep-0048">EEP-48</a>.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_doc</code>·will·raise·a·warning·when
297 <code·class="inline">-doc</code>·attributes·are·missing·in·exported·functions,·types,·and·callbacks.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_spec_documented</code>·will·raise·a·warning·when297 <code·class="inline">-doc</code>·attributes·are·missing·in·exported·functions,·types,·and·callbacks.</p></li><li><p>Using·the·compiler·flag·<code·class="inline">warn_missing_spec_documented</code>·will·raise·a·warning·when
298 spec·attributes·are·missing·in·documented·functions,·types,·and·callbacks.</p></li><li><p><code·class="inline">moduledoc</code>s·and·<code·class="inline">doc</code>s·may·refer·to·external·files·to·be·embedded,·such·as·<code·class="inline">-doc·{file,·&quot;README.md&quot;}.</code>,·which·refers·to·the·file·<code·class="inline">README.md</code>·found·in·the·current·working·directory.</p></li><li><p>The·compiler·warns·about·exported·functions·whose·specs·refer·to·hidden·types.·Thus,·there·will·be·warnings·when·a·hidden·type·(meaning,·the·type·is·not·part·of·the·documentation)·gets·used·in·an·exported·function.</p></li></ul><p>Own·Id:·OTP-18916·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7936"·title="">PR-7936</a></p></li><li><p>New·<a·href="ets.html"><code·class="inline">ets</code></a>·functions·<a·href="ets.html#first_lookup/1"><code·class="inline">ets:first_lookup/1</code></a>,·<a·href="ets.html#next_lookup/2"><code·class="inline">ets:next_lookup/2</code></a>,·<a·href="ets.html#prev_lookup/2"><code·class="inline">ets:prev_lookup/2</code></a>·and·<a·href="ets.html#last_lookup/1"><code·class="inline">ets:last_lookup/1</code></a>.·Example:·<code·class="inline">ets:next_lookup/1</code>·is·equivalent·to·<a·href="ets.html#next/2"><code·class="inline">ets:next/2</code></a>·followed·by·<a·href="ets.html#lookup/2"><code·class="inline">ets:lookup/2</code></a>·with·the·next·key.·The·new·combined·functions·are·more·efficient·and·with·guaranteed·atomicity.</p><p>Own·Id:·OTP-18923·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/6791"·title="">PR-6791</a></p></li><li><p>The·<code·class="inline">maybe</code>·expression·is·now·enabled·by·default.</p><p>To·use·<code·class="inline">maybe</code>·as·an·atom,·it·needs·to·be·single-quoted.·Alternatively,·the·<code·class="inline">maybe</code>·expression·can·be·disabled·by·disabling·the·<code·class="inline">maybe_expr</code>·feature.·That·can·be·done·by·placing·the·following·the·line·at·the·beginning·of·an·Erlang·source·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">feature</span><span·class="p"·data-group-id="8988519664-1">(</span><span·class="ss">maybe_expr</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disable</span><span·class="p"·data-group-id="8988519664-1">)</span><span·class="p">.</span></code></pre><p>Another·way·to·disable·the·<[·...·truncated·by·diffoscope;·len:·688,·SHA:·ba466a4636439f83a44a23a3dde559fda365b03a43a48b4ec93d21a75bdda2cd·...·]-1">)</span><span·class="p">.</span><span·class="w">298 spec·attributes·are·missing·in·documented·functions,·types,·and·callbacks.</p></li><li><p><code·class="inline">moduledoc</code>s·and·<code·class="inline">doc</code>s·may·refer·to·external·files·to·be·embedded,·such·as·<code·class="inline">-doc·{file,·&quot;README.md&quot;}.</code>,·which·refers·to·the·file·<code·class="inline">README.md</code>·found·in·the·current·working·directory.</p></li><li><p>The·compiler·warns·about·exported·functions·whose·specs·refer·to·hidden·types.·Thus,·there·will·be·warnings·when·a·hidden·type·(meaning,·the·type·is·not·part·of·the·documentation)·gets·used·in·an·exported·function.</p></li></ul><p>Own·Id:·OTP-18916·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7936"·title="">PR-7936</a></p></li><li><p>New·<a·href="ets.html"><code·class="inline">ets</code></a>·functions·<a·href="ets.html#first_lookup/1"><code·class="inline">ets:first_lookup/1</code></a>,·<a·href="ets.html#next_lookup/2"><code·class="inline">ets:next_lookup/2</code></a>,·<a·href="ets.html#prev_lookup/2"><code·class="inline">ets:prev_lookup/2</code></a>·and·<a·href="ets.html#last_lookup/1"><code·class="inline">ets:last_lookup/1</code></a>.·Example:·<code·class="inline">ets:next_lookup/1</code>·is·equivalent·to·<a·href="ets.html#next/2"><code·class="inline">ets:next/2</code></a>·followed·by·<a·href="ets.html#lookup/2"><code·class="inline">ets:lookup/2</code></a>·with·the·next·key.·The·new·combined·functions·are·more·efficient·and·with·guaranteed·atomicity.</p><p>Own·Id:·OTP-18923·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/6791"·title="">PR-6791</a></p></li><li><p>The·<code·class="inline">maybe</code>·expression·is·now·enabled·by·default.</p><p>To·use·<code·class="inline">maybe</code>·as·an·atom,·it·needs·to·be·single-quoted.·Alternatively,·the·<code·class="inline">maybe</code>·expression·can·be·disabled·by·disabling·the·<code·class="inline">maybe_expr</code>·feature.·That·can·be·done·by·placing·the·following·the·line·at·the·beginning·of·an·Erlang·source·file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">feature</span><span·class="p"·data-group-id="5630951971-1">(</span><span·class="ss">maybe_expr</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">disable</span><span·class="p"·data-group-id="5630951971-1">)</span><span·class="p">.</span></code></pre><p>Another·way·to·disable·the·<[·...·truncated·by·diffoscope;·len:·688,·SHA:·6ff4c6536a81457d28ae891db34fcb7458d52f393e4207c9502e85f7555d161c·...·]-1">)</span><span·class="p">.</span><span·class="w">
299 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6607488862-2">(</span><span·class="p"·data-group-id="6607488862-3">[</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6607488862-3">]</span><span·class="p"·data-group-id="6607488862-2">)</span><span·class="p">.</span><span·class="w">299 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4406129168-2">(</span><span·class="p"·data-group-id="4406129168-3">[</span><span·class="ss">f</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4406129168-3">]</span><span·class="p"·data-group-id="4406129168-2">)</span><span·class="p">.</span><span·class="w">
300 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="6607488862-4">(</span><span·class="ss">r</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6607488862-5">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·109,·SHA:·bb49a00714cc10db0778cc0b6450d3e8463b7a6d9270779b228122da72ae2a5f·...·]-4">)</span><span·class="p">.</span><span·class="w">300 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="4406129168-4">(</span><span·class="ss">r</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4406129168-5">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·109,·SHA:·93a1f4c87abdc920c1eb16060b89bd9836ac31935a1f37ba1e8ab1674413185f·...·]-4">)</span><span·class="p">.</span><span·class="w">
  
301 </span><span·class="nf">f</span><span·class="p"·data-group-id="6607488862-6">(</span><span·class="p"·data-group-id="6607488862-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">301 </span><span·class="nf">f</span><span·class="p"·data-group-id="4406129168-6">(</span><span·class="p"·data-group-id="4406129168-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
302 ····</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="6607488862-7">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="mi">1</span><span·class="p"·data-group-id="6607488862-7">}</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="6607488862-8">{</span><span[·...·truncated·by·diffoscope;·len:·110,·SHA:·0116b49ee92a81ff5fba3a0ced7a4d16e4e33d1a3ce6b4adfc034e351e3827c8·...·]-8">}</span><span·class="p">.</span></code></pre><p>The·compiler·raises·the·following·warning:</p><pre><code·class="text">1&gt;·c(t).302 ····</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="4406129168-7">{</span><span·class="ss">a</span><span·class="o">=</span><span·class="mi">1</span><span·class="p"·data-group-id="4406129168-7">}</span><span·class="o">#</span><span·class="ss">r</span><span·class="p"·data-group-id="4406129168-8">{</span><span[·...·truncated·by·diffoscope;·len:·110,·SHA:·a5a7515b4b355c582cb202aefa1c1517e3da0a4905c878e4abf25af0fab1db85·...·]-8">}</span><span·class="p">.</span></code></pre><p>The·compiler·raises·the·following·warning:</p><pre><code·class="text">1&gt;·c(t).
303 t.erl:6:12:·Warning:·expression·updates·a·literal303 t.erl:6:12:·Warning:·expression·updates·a·literal
304 %····6|·····#r{a=1}#r{b=2}.304 %····6|·····#r{a=1}#r{b=2}.
305 %·····|············^</code></pre><p>Own·Id:·OTP-18951·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8069"·title="">PR-8069</a></p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>Optimized·<code·class="inline">ets:foldl</code>·and·<code·class="inline">ets:foldr</code>·to·use·new·<code·class="inline">ets:next_lookup</code>.·Also·made·them·immune·against·table·renaming.</p><p>Own·Id:·OTP-18993·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8048"·title="">PR-8048</a></p></li><li><p>Windows·now·supports·all·functions·in·<a·href="math.html"><code·class="inline">math</code></a>.</p><p>Own·Id:·OTP-19001·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8164"·title="">PR-8164</a></p></li><li><p><a·href="erl_lint.html"><code·class="inline">erl_lint</code></a>·(and·by·extension·the·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html"><code·class="inline">compiler</code></a>)·will·now·warn·for·code·using·deprecated·callbacks.</p><p>The·only·callback·currenly·deprecated·is·<code·class="inline">format_status/2</code>·in·<a·href="gen_server.html#c:format_status/2"><code·class="inline">gen_server</code></a>,·<a·href="gen_event.html#c:format_status/2"><code·class="inline">gen_event</code></a>·and·<a·href="gen_server.html#c:format_status/2"><code·class="inline">gen_statem</code></a>.</p><p>You·can·use·<code·class="inline">nowarn_deprecated_callback</code>·to·silence·the·warning.</p><p>Own·Id:·OTP-19010·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8205"·title="">PR-8205</a></p></li><li><p>There·is·a·new·module·<a·href="json.html"><code·class="inline">json</code></a>·for·encoding·and·decoding·<a·href="https://en.wikipedia.org/wiki/JSON">JSON</a>.</p><p>Both·encoding·and·decoding·can·be·customized.·Decoding·can·be·done·in·a·SAX-like·fashion·and·handle·multiple·documents·and·streams·of·data.</p><p>Own·Id:·OTP-19020·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8111"·title="">PR-8111</a></p></li></ul><h2·id="stdlib-5-2-3-3"·class="section-heading">305 %·····|············^</code></pre><p>Own·Id:·OTP-18951·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8069"·title="">PR-8069</a></p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>Optimized·<code·class="inline">ets:foldl</code>·and·<code·class="inline">ets:foldr</code>·to·use·new·<code·class="inline">ets:next_lookup</code>.·Also·made·them·immune·against·table·renaming.</p><p>Own·Id:·OTP-18993·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8048"·title="">PR-8048</a></p></li><li><p>Windows·now·supports·all·functions·in·<a·href="math.html"><code·class="inline">math</code></a>.</p><p>Own·Id:·OTP-19001·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8164"·title="">PR-8164</a></p></li><li><p><a·href="erl_lint.html"><code·class="inline">erl_lint</code></a>·(and·by·extension·the·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html"><code·class="inline">compiler</code></a>)·will·now·warn·for·code·using·deprecated·callbacks.</p><p>The·only·callback·currenly·deprecated·is·<code·class="inline">format_status/2</code>·in·<a·href="gen_server.html#c:format_status/2"><code·class="inline">gen_server</code></a>,·<a·href="gen_event.html#c:format_status/2"><code·class="inline">gen_event</code></a>·and·<a·href="gen_server.html#c:format_status/2"><code·class="inline">gen_statem</code></a>.</p><p>You·can·use·<code·class="inline">nowarn_deprecated_callback</code>·to·silence·the·warning.</p><p>Own·Id:·OTP-19010·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8205"·title="">PR-8205</a></p></li><li><p>There·is·a·new·module·<a·href="json.html"><code·class="inline">json</code></a>·for·encoding·and·decoding·<a·href="https://en.wikipedia.org/wiki/JSON">JSON</a>.</p><p>Both·encoding·and·decoding·can·be·customized.·Decoding·can·be·done·in·a·SAX-like·fashion·and·handle·multiple·documents·and·streams·of·data.</p><p>Own·Id:·OTP-19020·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8111"·title="">PR-8111</a></p></li></ul><h2·id="stdlib-5-2-3-3"·class="section-heading">
306 ··<a·href="#stdlib-5-2-3-3"·class="hover-link">306 ··<a·href="#stdlib-5-2-3-3"·class="hover-link">
307 ····<i·class="ri-link-m"·aria-hidden="true"></i>307 ····<i·class="ri-link-m"·aria-hidden="true"></i>
308 ··</a>308 ··</a>
309 ··<span·class="text">STDLIB·5.2.3.3</span>309 ··<span·class="text">STDLIB·5.2.3.3</span>
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4635 ······<p·class="built-using">4635 ······<p·class="built-using">
4636 ········Built·using4636 ········Built·using
4637 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the4637 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
4638 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>4638 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
4639 ······</p>4639 ······</p>
4640 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>4640 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
4641 ····</footer>4641 ····</footer>
4642 ··</div>4642 ··</div>
4643 </main>4643 </main>
4644 </div>4644 </div>
4645 <script>4645 <script>
4646 ··function·mermaidLoaded()·{4646 ··function·mermaidLoaded()·{
4647 ····mermaid.initialize({4647 ····mermaid.initialize({
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./usr/share/doc/erlang-doc/html/lib/stdlib-6.2.2/doc/html/orddict.html
    
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138 ··<a·href="#module-notes"·class="hover-link">138 ··<a·href="#module-notes"·class="hover-link">
139 ····<i·class="ri-link-m"·aria-hidden="true"></i>139 ····<i·class="ri-link-m"·aria-hidden="true"></i>
140 ··</a>140 ··</a>
141 ··<span·class="text">Notes</span>141 ··<span·class="text">Notes</span>
142 </h2>142 </h2>
143 <p><a·href=""·id="notes"></a></p><p>Functions·<a·href="#append/3"><code·class="inline">append/3</code></a>·and·<a·href="#append_list/3"><code·class="inline">append_list/3</code></a>·are143 <p><a·href=""·id="notes"></a></p><p>Functions·<a·href="#append/3"><code·class="inline">append/3</code></a>·and·<a·href="#append_list/3"><code·class="inline">append_list/3</code></a>·are
144 included·so·that·keyed·values·can·be·stored·in·a·list·<em>accumulator</em>,·for144 included·so·that·keyed·values·can·be·stored·in·a·list·<em>accumulator</em>,·for
145 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">D0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="2340567260-1">(</span><span·class="p"·data-group-id="2340567260-1">)</span><span·class="p">,</span><span·class="w">145 example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">D0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="0983765573-1">(</span><span·class="p"·data-group-id="0983765573-1">)</span><span·class="p">,</span><span·class="w">
146 ··</span><span·class="n">D1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">store</span><span·class="p"·data-group-id="2340567260-2">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2340567260-3">[</span><span·class="p"·data-group-id="2340567260-3">]</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·63,·SHA:·a1341f045049f0b765592c39230908ea1fcace652f484ba3450f8ec48d556966·...·]-2">)</span><span·class="p">,</span><span·class="w">146 ··</span><span·class="n">D1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">store</span><span·class="p"·data-group-id="0983765573-2">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0983765573-3">[</span><span·class="p"·data-group-id="0983765573-3">]</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·63,·SHA:·9364058dedd5f90608a49269fd3234d3b2c5490bfa8398d3579b0e9c0aa8a33c·...·]-2">)</span><span·class="p">,</span><span·class="w">
147 ··</span><span·class="n">D2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="2340567260-4">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p"·data-group-id="2340567260-4">)</span><span·class="p">,</span><span·class="w">147 ··</span><span·class="n">D2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="0983765573-4">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D1</span><span·class="p"·data-group-id="0983765573-4">)</span><span·class="p">,</span><span·class="w">
148 ··</span><span·class="n">D3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="2340567260-5">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p"·data-group-id="2340567260-5">)</span><span·class="p">,</span><span·class="w">148 ··</span><span·class="n">D3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="0983765573-5">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D2</span><span·class="p"·data-group-id="0983765573-5">)</span><span·class="p">,</span><span·class="w">
149 ··</span><span·class="n">D4</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="2340567260-6">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D3</span><span·class="p"·data-group-id="2340567260-6">)</span><span·class="p">,</span><span·class="w">149 ··</span><span·class="n">D4</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="0983765573-6">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">f3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D3</span><span·class="p"·data-group-id="0983765573-6">)</span><span·class="p">,</span><span·class="w">
150 ··</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="2340567260-7">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D4</span><span·class="p"·data-group-id="2340567260-7">)</span><span·class="p">.</span><span·class="w">150 ··</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="0983765573-7">(</span><span·class="ss">files</span><span·class="p">,</span><span·class="w">·</span><span·class="n">D4</span><span·class="p"·data-group-id="0983765573-7">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="p"·data-group-id="2340567260-8">[</span><span·class="ss">f1</span><span·class="p">,</span><span·class="ss">f2</span><span·class="p">,</span><span·class="ss">f3</span><span·class="p"·data-group-id="2340567260-8">]</span></code></pre><p>This·saves·the·trouble·of·first·fetching·a·keyed·value,·appending·a·new·value·to151 </span><span·class="p"·data-group-id="0983765573-8">[</span><span·class="ss">f1</span><span·class="p">,</span><span·class="ss">f2</span><span·class="p">,</span><span·class="ss">f3</span><span·class="p"·data-group-id="0983765573-8">]</span></code></pre><p>This·saves·the·trouble·of·first·fetching·a·keyed·value,·appending·a·new·value·to
152 the·list·of·stored·values,·and·storing·the·result.</p><p>Function·<a·href="#fetch/2"><code·class="inline">fetch/2</code></a>·is·to·be·used·if·the·key·is·known·to·be·in·the152 the·list·of·stored·values,·and·storing·the·result.</p><p>Function·<a·href="#fetch/2"><code·class="inline">fetch/2</code></a>·is·to·be·used·if·the·key·is·known·to·be·in·the
153 dictionary,·otherwise·function·<a·href="#find/2"><code·class="inline">find/2</code></a>.</p><h2·id="module-see-also"·class="section-heading">153 dictionary,·otherwise·function·<a·href="#find/2"><code·class="inline">find/2</code></a>.</p><h2·id="module-see-also"·class="section-heading">
154 ··<a·href="#module-see-also"·class="hover-link">154 ··<a·href="#module-see-also"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">See·Also</span>157 ··<span·class="text">See·Also</span>
158 </h2>158 </h2>
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527 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append(Key,·Value,·Orddict1)·->·Orddict2527 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append(Key,·Value,·Orddict1)·->·Orddict2
528 ················when·Orddict1·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value),·Orddict2·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>528 ················when·Orddict1·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value),·Orddict2·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>
  
529 ······</div>529 ······</div>
  
530 <p>Appends·a·new·<code·class="inline">Value</code>·to·the·current·list·of·values·associated·with·<code·class="inline">Key</code>.·An530 <p>Appends·a·new·<code·class="inline">Value</code>·to·the·current·list·of·values·associated·with·<code·class="inline">Key</code>.·An
531 exception·is·generated·if·the·initial·value·associated·with·<code·class="inline">Key</code>·is·not·a·list531 exception·is·generated·if·the·initial·value·associated·with·<code·class="inline">Key</code>·is·not·a·list
532 of·values.</p><p>See·also·section·<a·href="orddict.html#module-notes">Notes</a>.</p><p><em>Example·1:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="5822637952-1">(</span><span·class="p"·data-group-id="5822637952-2">[</span><span·class="p"·data-group-id="5822637952-3">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5822637952-4">[</span><span·class="p"·data-group-id="5822637952-4">]</span><span·class="p"·data-group-id="5822637952-3">}</span><span·class="p"·data-group-id="5822637952-2">]</span><span·class="p"·data-group-id="5822637952-1">)</span><span·class="p">.</span><span·class="w"> 
533 </span><span·class="p"·data-group-id="5822637952-5">[</span><span·class="p"·data-group-id="5822637952-6">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="5822637952-7">[</span><span·class="p"·data-group-id="5822637952[·...·truncated·by·diffoscope;·len:·146,·SHA:·0f722e6b5cbf8549d7887348309ea73b16211ec09f0ffcb45df6a505b271d829·...·]">532 of·values.</p><p>See·also·section·<a·href="orddict.html#module-notes">Notes</a>.</p><p><em>Example·1:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·671,·SHA:·d123fd64fe1188b70847a0e06f35bae97eaa1de7f4cba1bf095e8b1900337b5d·...·]">
 533 </span><span·class="p"·data-group-id="3369962158-5">[</span><span·class="p"·data-group-id="3369962158-6">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3369962158-7">[</span><span·class="p"·data-group-id="3369962158-7">]</span><span·class="p"·data-group-id="3369962158-6">}</span><span·class="p"·data-group-id="3369962158-5">]</span><span·class="gp·unselectable">
534 2&gt;·</span><span·class="n">OrdDict2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5822637952-8">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="5822637952-8">)</span><span·class="p">.</span><span·class="w">534 2&gt;·</span><span·class="n">OrdDict2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="3369962158-8">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="3369962158-8">)</span><span·class="p">.</span><span·class="w">
535 </span><span·class="p"·data-group-id="5822637952-9">[</span><span·class="p"·data-group-id="5822637952-10">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="5822637952-11">[</span><span·class="mi">1</span><span·class="p"·data-group-id="5822637952-11">]</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·b14647788279417ad7b104446314b9e8599905a8fcc38eca80112f4685723a18·...·]-9">]</span><span·class="gp·unselectable">535 </span><span·class="p"·data-group-id="3369962158-9">[</span><span·class="p"·data-group-id="3369962158-10">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3369962158-11">[</span><span·class="mi">1</span><span·class="p"·data-group-id="3369962158-11">]</spa[·...·truncated·by·diffoscope;·len:·97,·SHA:·67a23262e39bc949a2cdf6483a24e412e5f49b0801c6b4ae8fe1c3a6edb2774b·...·]-9">]</span><span·class="gp·unselectable">
536 3&gt;·</span><span·class="n">OrdDict3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5822637952-12">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict2</span><span·class="p"·data-group-id="5822637952-12">)</span><span·class="p">.</span><span·class="w">536 3&gt;·</span><span·class="n">OrdDict3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="3369962158-12">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict2</span><span·class="p"·data-group-id="3369962158-12">)</span><span·class="p">.</span><span·class="w">
537 </span><span·class="p"·data-group-id="5822637952-13">[</span><span·class="p"·data-group-id="5822637952-14">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="5822637952-15">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·147,·SHA:·ab367aba351bb0ba86c258bb72cdb4c71b188e50fef537739efd80ffcbb9478e·...·]-13">]</span><span·class="gp·unselectable">537 </span><span·class="p"·data-group-id="3369962158-13">[</span><span·class="p"·data-group-id="3369962158-14">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3369962158-15">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·147,·SHA:·e06f6c6f1d73cc4427c6a21a12775b62456543368ca37f0b6dc1add5c6b8dbaa·...·]-13">]</span><span·class="gp·unselectable">
538 4&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="5822637952-16">(</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict3</span><span·class="p"·data-group-id="5822637952-16">)</span><span·class="p">.</span><span·class="w">538 4&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="3369962158-16">(</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict3</span><span·class="p"·data-group-id="3369962158-16">)</span><span·class="p">.</span><span·class="w">
539 </span><span·class="p"·data-group-id="5822637952-17">[</span><span·class="p"·data-group-id="5822637952-18">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="5822637952-19">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5822637952-19">]</span><span·class="p"·data-group-id="5822637952-18">}</span><span·class="p">,</span><span·class="p"·data-group-id="5822637952-20">{</span><span·class="ss">y</span><span·class="p">,</span><span·class="p"·data-group-id="5822637952-21">[</span><span·class="mi">3</span><span·class="p"·data-group-id="5822637952-21">]</span><span·class="p"·data-group-id="5822637952-20">}</span><span·class="p"·data-group-id="5822637952-17">]</span></code></pre><p><em>Example·2:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="1508747399-1">(</span><span·class="p"·data-group-id="1508747399-2">[</span><span·class="p"·data-group-id="1508747399-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">no_list</span><span·class="p"·data-group-id="1508747399-3">}</span><span·class="p"·data-group-id="1508747399-2">]</span><span·class="p"·data-group-id="1508747399-1">)</span><span·class="p">.</span><span·class="w"> 
540 </span><span·class="p"·data-group-id="1508747399-4">[</span><span·class="p"·data-group-id="1508747399-5">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">no_list</span><span·class="p"·data-group-id="1508747399-5">}</span><span·class="p"·data-group-id="1508747399-4">]</[·...·truncated·by·diffoscope;·len:·33,·SHA:·b2e352d8309445f25b55be1913f1379d4d74b8b1a31e1190b1cf594ab0bdcba8·...·]">539 </span><span·class="p"·data-group-id="3369962158-17">[</span><span·class="p"·data-group-id="3369962158-18">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3369962158-19">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·1255,·SHA:·dc8e992ef4fb6b70e61be27666b52f8dbec7cf5ccc782cdbc2d341c24cbff90f·...·]">
 540 </span><span·class="p"·data-group-id="3196183519-4">[</span><span·class="p"·data-group-id="3196183519-5">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">no_list</span><span·class="p"·data-group-id="3196183519-5">}</span><span·class="p"·data-group-id="3196183519-4">]</span><span·class="gp·unselectable">
541 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="1508747399-6">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="1508747399-6">)</span><span·class="p">.</span><span·class="w">541 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append</span><span·class="p"·data-group-id="3196183519-6">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="3196183519-6">)</span><span·class="p">.</span><span·class="w">
542 </span><span·class="gt">**·exception·error:·bad·argument542 </span><span·class="gt">**·exception·error:·bad·argument
543 ·····in·operator··++/2543 ·····in·operator··++/2
544 ········called·as·no_list·++·[1]</span></code></pre>544 ········called·as·no_list·++·[1]</span></code></pre>
545 ··</section>545 ··</section>
546 </section>546 </section>
547 <section·class="detail"·id="append_list/3">547 <section·class="detail"·id="append_list/3">
  
Offset 571, 20 lines modifiedOffset 571, 20 lines modified
571 ·························Orddict1·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value),571 ·························Orddict1·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value),
572 ·························Orddict2·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>572 ·························Orddict2·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>
  
573 ······</div>573 ······</div>
  
574 <p>Appends·a·list·of·values·<code·class="inline">ValList</code>·to·the·current·list·of·values·associated·with574 <p>Appends·a·list·of·values·<code·class="inline">ValList</code>·to·the·current·list·of·values·associated·with
575 <code·class="inline">Key</code>.·An·exception·is·generated·if·the·initial·value·associated·with·<code·class="inline">Key</code>·is575 <code·class="inline">Key</code>.·An·exception·is·generated·if·the·initial·value·associated·with·<code·class="inline">Key</code>·is
576 not·a·list·of·values.</p><p>See·also·section·<a·href="orddict.html#module-notes">Notes</a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="8343194308-1">(</span><span·class="p"·data-group-id="8343194308-2">[</span><span·class="p"·data-group-id="8343194308-3">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8343194308-4">[</span><s[·...·truncated·by·diffoscope;·len:·198,·SHA:·d629781d809a98f48e52c63be5b883184bf374b3908b1317a67994d3d484b383·...·]-1">)</span><span·class="p">.</span><span·class="w">576 not·a·list·of·values.</p><p>See·also·section·<a·href="orddict.html#module-notes">Notes</a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="3860276160-1">(</span><span·class="p"·data-group-id="3860276160-2">[</span><span·class="p"·data-group-id="3860276160-3">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3860276160-4">[</span><s[·...·truncated·by·diffoscope;·len:·198,·SHA:·7413c428ed4ff9c8e1f1ec57db57b7dd4068cfce6254e20b4c74e2f0f6aa446e·...·]-1">)</span><span·class="p">.</span><span·class="w">
577 </span><span·class="p"·data-group-id="8343194308-5">[</span><span·class="p"·data-group-id="8343194308-6">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="8343194308-7">[</span><span·class="p"·data-group-id="8343194308-7">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·68,·SHA:·aeb359f933e7a605ab1c018f67c5241747217bad0755b622246abbcee4a6a080·...·]-5">]</span><span·class="gp·unselectable">577 </span><span·class="p"·data-group-id="3860276160-5">[</span><span·class="p"·data-group-id="3860276160-6">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3860276160-7">[</span><span·class="p"·data-group-id="3860276160-7">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·68,·SHA:·328ac7124f3adc5fccac169cfc3bb2aeb1fb74f4564fc869de4cb32f3052e16c·...·]-5">]</span><span·class="gp·unselectable">
578 2&gt;·</span><span·class="n">OrdDict2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append_list</span><span·class="p"·data-group-id="8343194308-8">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8343194308-9">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="834[·...·truncated·by·diffoscope;·len:·139,·SHA:·b7e32b2bf03ef9879b7e873d5c50c66cd6b6a464b2d967f4af387eb2841d81f4·...·]-8">)</span><span·class="p">.</span><span·class="w">578 2&gt;·</span><span·class="n">OrdDict2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append_list</span><span·class="p"·data-group-id="3860276160-8">(</span><span·class="ss">x</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3860276160-9">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="386[·...·truncated·by·diffoscope;·len:·139,·SHA:·030e798515d5a1aa90adbc058712644ebb4147c82b6225341d16e344f954595b·...·]-8">)</span><span·class="p">.</span><span·class="w">
579 </span><span·class="p"·data-group-id="8343194308-10">[</span><span·class="p"·data-group-id="8343194308-11">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="8343194308-12">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·147,·SHA:·bc928d59dc44628a98387af0946fc4f1aa79946c111ce51f8adbf0fd49280078·...·]-10">]</span><span·class="gp·unselectable">579 </span><span·class="p"·data-group-id="3860276160-10">[</span><span·class="p"·data-group-id="3860276160-11">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3860276160-12">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·147,·SHA:·b688f4b3bfb0b5b75fbe3e5394eab474fc6ca3b5d5cf7b8a2b1e98474864deaf·...·]-10">]</span><span·class="gp·unselectable">
580 3&gt;·</span><span·class="n">OrdDict3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append_list</span><span·class="p"·data-group-id="8343194308-13">(</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8343194308-14">[</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="8[·...·truncated·by·diffoscope;·len:·142,·SHA:·9be2f85d7535747f15eb808304530a37e0a512788351c836b4e0ce325d937212·...·]-13">)</span><span·class="p">.</span><span·class="w">580 3&gt;·</span><span·class="n">OrdDict3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">append_list</span><span·class="p"·data-group-id="3860276160-13">(</span><span·class="ss">y</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3860276160-14">[</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="3[·...·truncated·by·diffoscope;·len:·142,·SHA:·60e7bb17a87b44d0d74b44471f70066c8278739c0b2a18181ccb204c6abb56cb·...·]-13">)</span><span·class="p">.</span><span·class="w">
581 </span><span·class="p"·data-group-id="8343194308-15">[</span><span·class="p"·data-group-id="8343194308-16">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="8343194308-17">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·510,·SHA:·2a54ab24b04edd802203ad084efda262bf94244508ab307682c17dc3190eb774·...·]-15">]</span></code></pre>581 </span><span·class="p"·data-group-id="3860276160-15">[</span><span·class="p"·data-group-id="3860276160-16">{</span><span·class="ss">x</span><span·class="p">,</span><span·class="p"·data-group-id="3860276160-17">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><s[·...·truncated·by·diffoscope;·len:·510,·SHA:·08c32287546b1be91e018b46178f671ba335b52f20ca891d6bc7f6c30fab4ec7·...·]-15">]</span></code></pre>
582 ··</section>582 ··</section>
583 </section>583 </section>
584 <section·class="detail"·id="erase/2">584 <section·class="detail"·id="erase/2">
  
585 ··<div·class="detail-header">585 ··<div·class="detail-header">
586 ····<a·href="#erase/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">586 ····<a·href="#erase/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
587 ······<i·class="ri-link-m"·aria-hidden="true"></i>587 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 603, 18 lines modifiedOffset 603, 18 lines modified
603 ······<div·class="specs">603 ······<div·class="specs">
  
604 ··········<pre·translate="no"><span·class="attribute">-spec</span>·erase(Key,·Orddict1)·->·Orddict2604 ··········<pre·translate="no"><span·class="attribute">-spec</span>·erase(Key,·Orddict1)·->·Orddict2
605 ···············when·Orddict1·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value),·Orddict2·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>605 ···············when·Orddict1·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value),·Orddict2·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>
  
606 ······</div>606 ······</div>
  
607 <p>Erases·all·items·with·a·specified·key·from·a·dictionary.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="1467679112-1">(</span><span·class="p"·data-group-id="1467679112-2">[</span><span·class="p"·data-group-id="1467679112-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·369,·SHA:·f20dda46b8cfd922d79f37f0395677bff83d0b53cc5d54d34c921721f75fa2c7·...·]-1">)</span><span·class="p">.</span><span·class="w">607 <p>Erases·all·items·with·a·specified·key·from·a·dictionary.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="0241336618-1">(</span><span·class="p"·data-group-id="0241336618-2">[</span><span·class="p"·data-group-id="0241336618-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·369,·SHA:·55910dc0b0957b3b6873820bc1eef8b6d30876fd38e0f250a3168e1110e84398·...·]-1">)</span><span·class="p">.</span><span·class="w">
608 </span><span·class="p"·data-group-id="1467679112-5">[</span><span·class="p"·data-group-id="1467679112-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1467679112-6">}</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·191,·SHA:·eb49436ca9997e6bd249f889f87c1bf5da7d228b33452c22e4e7df386516b2f2·...·]-5">]</span><span·class="gp·unselectable">608 </span><span·class="p"·data-group-id="0241336618-5">[</span><span·class="p"·data-group-id="0241336618-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0241336618-6">}</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·191,·SHA:·bdeac980d7c7ad8f5b98ee0d373b4e3a02e3722f0038b20ba6d96c4fa347d11f·...·]-5">]</span><span·class="gp·unselectable">
609 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">erase</span><span·class="p"·data-group-id="1467679112-8">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="1467679112-8">)</span><span·class="p">.</span><span·class="w">609 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">erase</span><span·class="p"·data-group-id="0241336618-8">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="0241336618-8">)</span><span·class="p">.</span><span·class="w">
610 </span><span·class="p"·data-group-id="1467679112-9">[</span><span·class="p"·data-group-id="1467679112-10">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1467679112-10">}</span><span·class="p"·data-group-id="1467679112-9">]</span></code></pre>610 </span><span·class="p"·data-group-id="0241336618-9">[</span><span·class="p"·data-group-id="0241336618-10">{</span><span·class="ss">b</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="0241336618-10">}</span><span·class="p"·data-group-id="0241336618-9">]</span></code></pre>
611 ··</section>611 ··</section>
612 </section>612 </section>
613 <section·class="detail"·id="fetch/2">613 <section·class="detail"·id="fetch/2">
  
614 ··<div·class="detail-header">614 ··<div·class="detail-header">
615 ····<a·href="#fetch/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">615 ····<a·href="#fetch/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
616 ······<i·class="ri-link-m"·aria-hidden="true"></i>616 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 634, 19 lines modifiedOffset 634, 19 lines modified
  
634 ··········<pre·translate="no"><span·class="attribute">-spec</span>·fetch(Key,·Orddict)·->·Value·when·Orddict·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>634 ··········<pre·translate="no"><span·class="attribute">-spec</span>·fetch(Key,·Orddict)·->·Value·when·Orddict·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value).</pre>
  
635 ······</div>635 ······</div>
  
636 <p>Returns·the·value·associated·with·<code·class="inline">Key</code>·in·dictionary·<code·class="inline">Orddict</code>.·This·function636 <p>Returns·the·value·associated·with·<code·class="inline">Key</code>·in·dictionary·<code·class="inline">Orddict</code>.·This·function
637 assumes·that·the·<code·class="inline">Key</code>·is·present·in·the·dictionary.·An·exception·is·generated637 assumes·that·the·<code·class="inline">Key</code>·is·present·in·the·dictionary.·An·exception·is·generated
638 if·<code·class="inline">Key</code>·is·not·in·the·dictionary.</p><p>See·also·section·<a·href="orddict.html#module-notes">Notes</a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="1569922076-1">(</span><span·class="p"·data-group-id="1569922076-2">[</span><span·class="p"·data-group-id="1569922076-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·369,·SHA:·1aa0ffc82ac98658c7f22987fdb5b141ea6b3c35c87ebfde2e038173f88549ac·...·]-1">)</span><span·class="p">.</span><span·class="w">638 if·<code·class="inline">Key</code>·is·not·in·the·dictionary.</p><p>See·also·section·<a·href="orddict.html#module-notes">Notes</a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="8853809879-1">(</span><span·class="p"·data-group-id="8853809879-2">[</span><span·class="p"·data-group-id="8853809879-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·369,·SHA:·984e9bc44cad84ed8d424553cae0529d07d45be069775bf1d2bee32bdeed3a5a·...·]-1">)</span><span·class="p">.</span><span·class="w">
639 </span><span·class="p"·data-group-id="1569922076-5">[</span><span·class="p"·data-group-id="1569922076-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1569922076-6">}</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·191,·SHA:·1caab38f3659494fab696e555d1277d588a1d48f073a22bf50fca7ad6b5855e5·...·]-5">]</span><span·class="gp·unselectable">639 </span><span·class="p"·data-group-id="8853809879-5">[</span><span·class="p"·data-group-id="8853809879-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="8853809879-6">}</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·191,·SHA:·c79646c5cda356be6a7a7fdde191328cd39f58f2631d57444ef3e7aadfc63ecd·...·]-5">]</span><span·class="gp·unselectable">
640 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="1569922076-8">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="1569922076-8">)</span><span·class="p">.</span><span·class="w">640 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="8853809879-8">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="8853809879-8">)</span><span·class="p">.</span><span·class="w">
641 </span><span·class="mi">1</span><span·class="gp·unselectable">641 </span><span·class="mi">1</span><span·class="gp·unselectable">
642 3&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="1569922076-9">(</span><span·class="ss">missing</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="1569922076-9">)</span><span·class="p">.</span><span·class="w">642 3&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch</span><span·class="p"·data-group-id="8853809879-9">(</span><span·class="ss">missing</span><span·class="p">,</span><span·class="w">·</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="8853809879-9">)</span><span·class="p">.</span><span·class="w">
643 </span><span·class="gt">**·exception·error:·no·function·clause·matching·orddict:fetch(missing,[])</span></code></pre>643 </span><span·class="gt">**·exception·error:·no·function·clause·matching·orddict:fetch(missing,[])</span></code></pre>
644 ··</section>644 ··</section>
645 </section>645 </section>
646 <section·class="detail"·id="fetch_keys/1">646 <section·class="detail"·id="fetch_keys/1">
  
647 ··<div·class="detail-header">647 ··<div·class="detail-header">
648 ····<a·href="#fetch_keys/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">648 ····<a·href="#fetch_keys/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 665, 18 lines modifiedOffset 665, 18 lines modified
  
665 ······<div·class="specs">665 ······<div·class="specs">
  
666 ··········<pre·translate="no"><span·class="attribute">-spec</span>·fetch_keys(Orddict)·->·Keys·when·Orddict·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()),·Keys·::·[Key].</pre>666 ··········<pre·translate="no"><span·class="attribute">-spec</span>·fetch_keys(Orddict)·->·Keys·when·Orddict·::·<a·href="#t:orddict/2">orddict</a>(Key,·Value·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()),·Keys·::·[Key].</pre>
  
667 ······</div>667 ······</div>
  
668 <p>Returns·a·list·of·all·keys·in·a·dictionary.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="6043630160-1">(</span><span·class="p"·data-group-id="6043630160-2">[</span><span·class="p"·data-group-id="6043630160-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·368,·SHA:·0ca00ab1e9a78230c473b164327a36f95d678fb774b12db66083117a8adaa480·...·]0-1">)</span><span·class="p">.</span><span·class="w">668 <p>Returns·a·list·of·all·keys·in·a·dictionary.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">OrdDict1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="9638981300-1">(</span><span·class="p"·data-group-id="9638981300-2">[</span><span·class="p"·data-group-id="9638981300-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·368,·SHA:·bec13c17272557f210aec9168f77fc89ce0d296a04c6277600e4a835428f2d3f·...·]0-1">)</span><span·class="p">.</span><span·class="w">
669 </span><span·class="p"·data-group-id="6043630160-5">[</span><span·class="p"·data-group-id="6043630160-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="6043630160-6">}</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·190,·SHA:·f10172684a43524176894474208c967833b8fbc79531eac2addc9bb4a56cc0bc·...·]0-5">]</span><span·class="gp·unselectable">669 </span><span·class="p"·data-group-id="9638981300-5">[</span><span·class="p"·data-group-id="9638981300-6">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="9638981300-6">}</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·190,·SHA:·25ea8855a9267dc213d35078e33d4afc5648f517fc72e9ad36d2559f8477dc4b·...·]0-5">]</span><span·class="gp·unselectable">
670 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch_keys</span><span·class="p"·data-group-id="6043630160-8">(</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="6043630160-8">)</span><span·class="p">.</span><span·class="w">670 2&gt;·</span><span·class="nc">orddict</span><span·class="p">:</span><span·class="nf">fetch_keys</span><span·class="p"·data-group-id="9638981300-8">(</span><span·class="n">OrdDict1</span><span·class="p"·data-group-id="9638981300-8">)</span><span·class="p">.</span><span·class="w">
671 </span><span·class="p"·data-group-id="6043630160-9">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="6043630160-9">]</span></code></pre>671 </span><span·class="p"·data-group-id="9638981300-9">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="p"·data-group-id="9638981300-9">]</span></code></pre>
672 ··</section>672 ··</section>
673 </section>673 </section>
674 <section·class="detail"·id="filter/2">674 <section·class="detail"·id="filter/2">
  
675 ··<div·class="detail-header">675 ··<div·class="detail-header">
676 ····<a·href="#filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">676 ····<a·href="#filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
677 ······<i·class="ri-link-m"·aria-hidden="true"></i>677 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1045 ········Built·using1045 ········Built·using
1046 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1046 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1047 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1047 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1048 ······</p>1048 ······</p>
1049 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1049 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1050 ····</footer>1050 ····</footer>
1051 ··</div>1051 ··</div>
1052 </main>1052 </main>
1053 </div>1053 </div>
1054 <script>1054 <script>
1055 ··function·mermaidLoaded()·{1055 ··function·mermaidLoaded()·{
1056 ····mermaid.initialize({1056 ····mermaid.initialize({
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157 employs·a·number·of·techniques·to·speed·up·testing·and·reliably·shut·down·peer157 employs·a·number·of·techniques·to·speed·up·testing·and·reliably·shut·down·peer
158 nodes:</p><ul><li>peers·start·linked·to·test·runner·process.·If·the·test·case·fails,·the·peer158 nodes:</p><ul><li>peers·start·linked·to·test·runner·process.·If·the·test·case·fails,·the·peer
159 node·is·stopped·automatically,·leaving·no·rogue·nodes·running·in·the159 node·is·stopped·automatically,·leaving·no·rogue·nodes·running·in·the
160 background</li><li>arguments·used·to·start·the·peer·are·saved·in·the·control·process·state·for160 background</li><li>arguments·used·to·start·the·peer·are·saved·in·the·control·process·state·for
161 manual·analysis.·If·the·test·case·fails,·the·CRASH·REPORT·contains·these161 manual·analysis.·If·the·test·case·fails,·the·CRASH·REPORT·contains·these
162 arguments</li><li>multiple·test·cases·can·run·concurrently·speeding·up·overall·testing·process,162 arguments</li><li>multiple·test·cases·can·run·concurrently·speeding·up·overall·testing·process,
163 peer·node·names·are·unique·even·when·there·are·multiple·instances·of·the·same163 peer·node·names·are·unique·even·when·there·are·multiple·instances·of·the·same
164 test·suite·running·in·parallel</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9663809047-1">(</span><span·class="ss">my_SUITE</span><span·class="p"·data-group-id="9663809047-1">)</span><span·class="p">.</span><span·class="w">164 test·suite·running·in·parallel</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="0969137184-1">(</span><span·class="ss">my_SUITE</span><span·class="p"·data-group-id="0969137184-1">)</span><span·class="p">.</span><span·class="w">
165 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="9663809047-2">(</span><span·class="ss">ct_suite</span><span·class="p"·data-group-id="9663809047-2">)</span><span·class="p">.</span><span·class="w">165 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="0969137184-2">(</span><span·class="ss">ct_suite</span><span·class="p"·data-group-id="0969137184-2">)</span><span·class="p">.</span><span·class="w">
166 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9663809047-3">(</span><span·class="p"·data-group-id="9663809047-4">[</span><span·class="ss">all</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">groups</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·a008470a88c42915340040d1f6b04017c9e143c5e8fdf374b7fddcd22291a71e·...·]-3">)</span><span·class="p">.</span><span·class="w">166 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0969137184-3">(</span><span·class="p"·data-group-id="0969137184-4">[</span><span·class="ss">all</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">groups</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·116,·SHA:·ac53484f2a168bf4a392c30f715e38757f93fa94b6388a3399a84f9d163ea125·...·]-3">)</span><span·class="p">.</span><span·class="w">
167 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9663809047-5">(</span><span·class="p"·data-group-id="9663809047-6">[</span><span·class="ss">basic</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">args</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·506,·SHA:·b35f6c6bfed8aa5321426e4ac5c8e6b1c2c18945a14675b03b3a09e736a7245d·...·]-5">)</span><span·class="p">.</span><span·class="w">167 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="0969137184-5">(</span><span·class="p"·data-group-id="0969137184-6">[</span><span·class="ss">basic</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">args</span><span·class="p">/</span><sp[·...·truncated·by·diffoscope;·len:·506,·SHA:·da1d13fe767d932994d3932f823c086ee37cc677644ff05662fd41d5ca93cbec·...·]-5">)</span><span·class="p">.</span><span·class="w">
168 </span><span·class="w">168 </span><span·class="w">
169 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9663809047-7">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="9663809047-7">)</span><span·class="p">.</span><span·class="w">169 </span><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="0969137184-7">(</span><span·class="s">&quot;common_test/include/ct.hrl&quot;</span><span·class="p"·data-group-id="0969137184-7">)</span><span·class="p">.</span><span·class="w">
  
170 </span><span·class="nf">groups</span><span·class="p"·data-group-id="9663809047-8">(</span><span·class="p"·data-group-id="9663809047-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">170 </span><span·class="nf">groups</span><span·class="p"·data-group-id="0969137184-8">(</span><span·class="p"·data-group-id="0969137184-8">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
171 ····</span><span·class="p"·data-group-id="9663809047-9">[</span><span·class="p"·data-group-id="9663809047-10">{</span><span·class="ss">quick</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9663809047-11">[</span><span·class="ss">parallel</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·8b40e92559e0cef683f7582d6ff4e1a2ac557b7c48444134bfad6096ab2772b2·...·]-11">]</span><span·class="p">,</span><span·class="w">171 ····</span><span·class="p"·data-group-id="0969137184-9">[</span><span·class="p"·data-group-id="0969137184-10">{</span><span·class="ss">quick</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0969137184-11">[</span><span·class="ss">parallel</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·bd7e596bb562800f6bdf06f1b91e4429ed1fdccdc62a76a172a25834c23ea9ef·...·]-11">]</span><span·class="p">,</span><span·class="w">
172 ········</span><span·class="p"·data-group-id="9663809047-12">[</span><span·class="ss">basic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">args</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">named</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·264,·SHA:·5ab1b345282dc78cbe21205adc6e4fee45b116025ae900446a1a753fa17f35aa·...·]-9">]</span><span·class="p">.</span><span·class="w">172 ········</span><span·class="p"·data-group-id="0969137184-12">[</span><span·class="ss">basic</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">args</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">named</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·264,·SHA:·814cbc336b13e9cb12b1d05d289f5d3954de104b434fc73e90d18758f4e8602f·...·]-9">]</span><span·class="p">.</span><span·class="w">
  
173 </span><span·class="nf">all</span><span·class="p"·data-group-id="9663809047-13">(</span><span·class="p"·data-group-id="9663809047-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">173 </span><span·class="nf">all</span><span·class="p"·data-group-id="0969137184-13">(</span><span·class="p"·data-group-id="0969137184-13">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
174 ····</span><span·class="p"·data-group-id="9663809047-14">[</span><span·class="p"·data-group-id="9663809047-15">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">quick</span><span·class="p"·data-group-id="9663809047-15">}</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·2141ff1cfb5d912c135b7496a9a04d91a1da58500eb02fb9132c4db5f153eecf·...·]-14">]</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="p"·data-group-id="0969137184-14">[</span><span·class="p"·data-group-id="0969137184-15">{</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">quick</span><span·class="p"·data-group-id="0969137184-15">}</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·7f8a1d86107a65dd64cb9778be67b83ae73d51e13b3790cf6fb96e2f83cc8001·...·]-14">]</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="nf">basic</span><span·class="p"·data-group-id="9663809047-16">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9663809047-16">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="9663809047-17[·...·truncated·by·diffoscope;·len:·80,·SHA:·5fa1eee46734ad1c707ee1845a3aef35c65a987eaf8a0464e4e1248a82066dff·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 </span><span·class="nf">basic</span><span·class="p"·data-group-id="0969137184-16">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0969137184-16">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="0969137184-17[·...·truncated·by·diffoscope;·len:·80,·SHA:·e5ca13074ba790dd7aa0a17fc1ce84e36b8138c4170d92a767b9c78b8b7b0c5e·...·]-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ····</span><span·class="p"·data-group-id="9663809047-18">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Node</span><span·class="p"·data-group-id="96[·...·truncated·by·diffoscope;·len:·242,·SHA:·e117565fc178e99f96f4d6fe2d5c0f5aac43af2d714221e4747169320bf89575·...·]-19">)</span><span·class="p">,</span><span·class="w">176 ····</span><span·class="p"·data-group-id="0969137184-18">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Node</span><span·class="p"·data-group-id="09[·...·truncated·by·diffoscope;·len:·242,·SHA:·0e38e59a3bb6d18b1877a686d990d8bae4911ff601b43b60813b42b24f0db514·...·]-19">)</span><span·class="p">,</span><span·class="w">
177 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9663809047-20">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="9663809047-20">)</span><span·class="p">.</span><span·class="w">177 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0969137184-20">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="0969137184-20">)</span><span·class="p">.</span><span·class="w">
  
178 </span><span·class="nf">args</span><span·class="p"·data-group-id="9663809047-21">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9663809047-21">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="9663809047-22[·...·truncated·by·diffoscope;·len:·80,·SHA:·5fa1eee46734ad1c707ee1845a3aef35c65a987eaf8a0464e4e1248a82066dff·...·]-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 </span><span·class="nf">args</span><span·class="p"·data-group-id="0969137184-21">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0969137184-21">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="0969137184-22[·...·truncated·by·diffoscope;·len:·80,·SHA:·e5ca13074ba790dd7aa0a17fc1ce84e36b8138c4170d92a767b9c78b8b7b0c5e·...·]-22">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ····</span><span·class="c1">%%·specify·additional·arguments·to·the·new·node</span><span·class="w">179 ····</span><span·class="c1">%%·specify·additional·arguments·to·the·new·node</span><span·class="w">
180 ····</span><span·class="p"·data-group-id="9663809047-23">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Node</span><span·class="p"·data-group-id="96[·...·truncated·by·diffoscope;·len:·482,·SHA:·f094aa88e67bd37327b5d82755e51fec292b7a680616b132f170ae7790ab18b5·...·]-24">)</span><span·class="p">,</span><span·class="w">180 ····</span><span·class="p"·data-group-id="0969137184-23">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Node</span><span·class="p"·data-group-id="09[·...·truncated·by·diffoscope;·len:·482,·SHA:·d27b9a62bcc97333dffde6388b15b66ed13bb462d9b4e90fe2857fe2108cccbd·...·]-24">)</span><span·class="p">,</span><span·class="w">
181 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9663809047-26">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="9663809047-26">)</span><span·class="p">.</span><span·class="w">181 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0969137184-26">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="0969137184-26">)</span><span·class="p">.</span><span·class="w">
  
182 </span><span·class="nf">named</span><span·class="p"·data-group-id="9663809047-27">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9663809047-27">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="9663809047-28[·...·truncated·by·diffoscope;·len:·80,·SHA:·5fa1eee46734ad1c707ee1845a3aef35c65a987eaf8a0464e4e1248a82066dff·...·]-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 </span><span·class="nf">named</span><span·class="p"·data-group-id="0969137184-27">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0969137184-27">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="0969137184-28[·...·truncated·by·diffoscope;·len:·80,·SHA:·e5ca13074ba790dd7aa0a17fc1ce84e36b8138c4170d92a767b9c78b8b7b0c5e·...·]-28">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ····</span><span·class="c1">%%·pass·test·case·name·down·to·function·starting·nodes</span><span·class="w">183 ····</span><span·class="c1">%%·pass·test·case·name·down·to·function·starting·nodes</span><span·class="w">
184 ····</span><span·class="n">Peer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_node_impl</span><span·class="p"·data-group-id="9663809047-29">(</span><span·class="ss">named_test</span><span·class="p"·data-group-id="9663809047-29">)</span><span·class="p">,</span><span·class="w">184 ····</span><span·class="n">Peer</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">start_node_impl</span><span·class="p"·data-group-id="0969137184-29">(</span><span·class="ss">named_test</span><span·class="p"·data-group-id="0969137184-29">)</span><span·class="p">,</span><span·class="w">
185 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9663809047-30">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="9663809047-30">)</span><span·class="p">.</span><span·class="w">185 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0969137184-30">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="0969137184-30">)</span><span·class="p">.</span><span·class="w">
  
186 </span><span·class="nf">start_node_impl</span><span·class="p"·data-group-id="9663809047-31">(</span><span·class="n">ActualTestCase</span><span·class="p"·data-group-id="9663809047-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">186 </span><span·class="nf">start_node_impl</span><span·class="p"·data-group-id="0969137184-31">(</span><span·class="n">ActualTestCase</span><span·class="p"·data-group-id="0969137184-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
187 ····</span><span·class="p"·data-group-id="9663809047-32">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="9663809047-32">}</span><sp[·...·truncated·by·diffoscope;·len:·635,·SHA:·a80c8fcb16f9cf0d36051d57b0fa04352ced869fc5313d94a2da783d6e5c3779·...·]-33">)</span><span·class="p">,</span><span·class="w">187 ····</span><span·class="p"·data-group-id="0969137184-32">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="0969137184-32">}</span><sp[·...·truncated·by·diffoscope;·len:·635,·SHA:·dc887af1a3d9dad204a0bcfd65261a4aca685c3b9c9ac28ea691a5b04ae2f4c8·...·]-33">)</span><span·class="p">,</span><span·class="w">
188 ····</span><span·class="c1">%%·extra·setup·needed·for·multiple·test·cases</span><span·class="w">188 ····</span><span·class="c1">%%·extra·setup·needed·for·multiple·test·cases</span><span·class="w">
189 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rpc</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9663809047-36">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">set_env</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·335,·SHA:·3aea76da7f585b05b49f1f8341c45dd169c2828b861e2502d7170ccafb2fee26·...·]-36">)</span><span·class="p">,</span><span·class="w">189 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rpc</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="0969137184-36">(</span><span·class="n">Node</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">application</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">set_env</span><span·class="p">,</span><span·class="w">·</s[·...·truncated·by·diffoscope;·len:·335,·SHA:·5970824b21b8d4528aa5bb8175e97219305adb6095b550acfe38b947619fd46a·...·]-36">)</span><span·class="p">,</span><span·class="w">
190 ····</span><span·class="n">Peer</span><span·class="p">.</span><span·class="w">190 ····</span><span·class="n">Peer</span><span·class="p">.</span><span·class="w">
  
191 </span><span·class="nf">restart_node</span><span·class="p"·data-group-id="9663809047-38">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9663809047-38">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="9663809047-39[·...·truncated·by·diffoscope;·len:·80,·SHA:·5fa1eee46734ad1c707ee1845a3aef35c65a987eaf8a0464e4e1248a82066dff·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">191 </span><span·class="nf">restart_node</span><span·class="p"·data-group-id="0969137184-38">(</span><span·class="n">Config</span><span·class="p"·data-group-id="0969137184-38">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="0969137184-39[·...·truncated·by·diffoscope;·len:·80,·SHA:·e5ca13074ba790dd7aa0a17fc1ce84e36b8138c4170d92a767b9c78b8b7b0c5e·...·]-39">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
192 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">CT_PEER_NAME</span><span·class="p"·data-group-id="9663809047-40">(</span><span·class="p"·data-group-id="9663809047-40">)</span><span·class="p">,</span><span·class="w">192 ····</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">CT_PEER_NAME</span><span·class="p"·data-group-id="0969137184-40">(</span><span·class="p"·data-group-id="0969137184-40">)</span><span·class="p">,</span><span·class="w">
193 ····</span><span·class="p"·data-group-id="9663809047-41">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="9663809047-41">}</span><sp[·...·truncated·by·diffoscope;·len:·458,·SHA:·aa59d4feead55b239758699bbd028d09d8d5d2ffc529ac467f8e6478d5ed71e0·...·]-42">)</span><span·class="p">,</span><span·class="w">193 ····</span><span·class="p"·data-group-id="0969137184-41">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="0969137184-41">}</span><sp[·...·truncated·by·diffoscope;·len:·458,·SHA:·051a33b26e2c815c4dcef1aedee7a53c08c61feedb80a0e0d633e9fa2a288c5d·...·]-42">)</span><span·class="p">,</span><span·class="w">
194 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9663809047-44">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="9663809047-44">)</span><span·class="p">,</span><span·class="w">194 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0969137184-44">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="0969137184-44">)</span><span·class="p">,</span><span·class="w">
195 ····</span><span·class="c1">%%·restart·the·node·with·the·same·name·as·before</span><span·class="w">195 ····</span><span·class="c1">%%·restart·the·node·with·the·same·name·as·before</span><span·class="w">
196 ····</span><span·class="p"·data-group-id="9663809047-45">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="9663809047-45">}</span><s[·...·truncated·by·diffoscope;·len:·758,·SHA:·fe9ea189b325002cfc54e711106fa6795f79d373ee640f69d49d521d7c74f70c·...·]-46">)</span><span·class="p">,</span><span·class="w">196 ····</span><span·class="p"·data-group-id="0969137184-45">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="0969137184-45">}</span><s[·...·truncated·by·diffoscope;·len:·758,·SHA:·8d3831c797ec813817062a76cb45864ab2d4a31def058e1647904be841fb40f4·...·]-46">)</span><span·class="p">,</span><span·class="w">
197 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9663809047-49">(</span><span·class="n">Peer2</span><span·class="p"·data-group-id="9663809047-49">)</span><span·class="p">.</span></code></pre><p>The·next·example·demonstrates·how·to·start·multiple·nodes·concurrently:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">multi_node</span><span·class="p"·data-group-id="9918792819-1">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9918792819-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="9918792819-2">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9918792819-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
198 ····</span><span·class="n">Peers</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9918792819-3">[</span><span·class="o">?</span><span·class="n">CT_PEER</span><span·class="p"·data-group-id="9918792819-4">(</span><span·clas[·...·truncated·by·diffoscope;·len:·567,·SHA:·128837b222d5f9bd0cf13463ac7824a399213e6da4247476f6b6f7ba2e9ee9b7·...·]</span><span·class="w">197 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0969137184-49">(</span><span·class="n">Peer2</span><span·class="p"·data-group-id="0969137184-49">)</span><span·class="p">.</span></code></pre><p>The·next·examp[·...·truncated·by·diffoscope;·len:·564,·SHA:·293d90db3d435ec32723b45e724177f21740bb3c4662d54076f44b6bfb040ade·...·]</span><span·class="w">
 198 ····</span><span·class="n">Peers</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0093335518-3">[</span><span·class="o">?</span><span·class="n">CT_PEER</span><span·class="p"·data-group-id="0093335518-4">(</span><span·class="p"·data-group-id="0093335518-5">#{</span><span·class="ss">wait_boot</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0093335518-6">{</span><span·class="nf">self</span><span·class="p"·data-group-id="0093335518-7">(</span><span·class="p"·data-group-id="0093335518-7">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">tag</span><span·class="p"·data-group-id="0093335518-6">}</span><span·class="p"·data-group-id="0093335518-5">}</span><span·class="p"·data-group-id="0093335518-4">)</span><span·class="w">
199 ········</span><span·class="p">||</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="9918792819-8">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="9918792819-8">)</span><span·class="p"·data-group-id="9918792819-3">]</span><span·class="p">,</span><span·class="w">199 ········</span><span·class="p">||</span><span·class="w">·</span><span·class="p">_</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="0093335518-8">(</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">4</span><span·class="p"·data-group-id="0093335518-8">)</span><span·class="p"·data-group-id="0093335518-3">]</span><span·class="p">,</span><span·class="w">
200 ····</span><span·class="c1">%%·wait·for·all·nodes·to·complete·boot·process,·get·their·names:</span><span·class="w">200 ····</span><span·class="c1">%%·wait·for·all·nodes·to·complete·boot·process,·get·their·names:</span><span·class="w">
201 ····</span><span·class="p">_</span><span·class="n">Nodes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9918792819-9">[</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="9918792819-10">{</span><span·class="ss">tag</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9918792819-11">{</sp[·...·truncated·by·diffoscope;·len:·279,·SHA:·83258f79db64511d47e4cc6d1b846c6ba5c3a3400a6e6f82023376772be192df·...·]-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">·</span><span·class="k">end</span><span·class="w">201 ····</span><span·class="p">_</span><span·class="n">Nodes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0093335518-9">[</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="0093335518-10">{</span><span·class="ss">tag</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0093335518-11">{</sp[·...·truncated·by·diffoscope;·len:·279,·SHA:·658d1f8a3a21a57ed4c1b962135f48e91fb2e627d6a4da799355e2c3551436b8·...·]-10">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Node</span><span·class="w">·</span><span·class="k">end</span><span·class="w">
202 ········</span><span·class="p">||</span><span·class="w">·</span><span·class="p"·data-group-id="9918792819-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p"·data-group-id="9918792819-12">}</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·67,·SHA:·1a5d38b2b93937bf2cc52e058729c1255e437eed4cd98726fb68faf589904893·...·]-9">]</span><span·class="p">,</span><span·class="w">202 ········</span><span·class="p">||</span><span·class="w">·</span><span·class="p"·data-group-id="0093335518-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p"·data-group-id="0093335518-12">}</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·67,·SHA:·7ec3cb08f839065138e6f7a0cd1590441512c21b8cbf496819de3c396080b6ac·...·]-9">]</span><span·class="p">,</span><span·class="w">
203 ····</span><span·class="p"·data-group-id="9918792819-13">[</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9918792819-14">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="9918792819-14">)</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·409,·SHA:·95051d6248606c1ca7fe8e4ca3ac1e53d9681b61508570ba0016cb6e448898bc·...·]-13">]</span><span·class="p">.</span></code></pre><p>Start·a·peer·on·a·different·host.·Requires·<code·class="inline">ssh</code>·key-based·authentication·set203 ····</span><span·class="p"·data-group-id="0093335518-13">[</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="0093335518-14">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="0093335518-14">)</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·409,·SHA:·384db478e3a93d9c5292ef45ae9794a0bd382c600b1ba32a43aa902a3b2bec85·...·]-13">]</span><span·class="p">.</span></code></pre><p>Start·a·peer·on·a·different·host.·Requires·<code·class="inline">ssh</code>·key-based·authentication·set
204 up,·allowing·&quot;another_host&quot;·connection·without·password·prompt.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Ssh</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">find_executable</span><span·class="p"·data-group-id="5165704447-1">(</span><span·class="s">&quot;ssh&quot;</span><span·class="p"·data-group-id="5165704447-1">)</span><span·class="p">,</span><span·class="w">204 up,·allowing·&quot;another_host&quot;·connection·without·password·prompt.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Ssh</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">find_executable</span><span·class="p"·data-group-id="4501598534-1">(</span><span·class="s">&quot;ssh&quot;</span><span·class="p"·data-group-id="4501598534-1">)</span><span·class="p">,</span><span·class="w">
205 </span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="5165704447-2">(</span><span·class="p"·data-group-id="5165704447-3">#{</span><span·class="ss">exec</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5165704447-4">{</span><span·class="n">Ssh</sp[·...·truncated·by·diffoscope;·len:·331,·SHA:·7815c84ace5d9ac861e0773009ee8a943b5a88763e9cacad23336f2ddf1fc3c8·...·]-4">}</span><span·class="p">,</span><span·class="w">205 </span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="4501598534-2">(</span><span·class="p"·data-group-id="4501598534-3">#{</span><span·class="ss">exec</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4501598534-4">{</span><span·class="n">Ssh</sp[·...·truncated·by·diffoscope;·len:·331,·SHA:·0e571d1aecb16bd2334f31c97edd8c5b334cd1a3e4effe39d8ca1eb4baaca8bc·...·]-4">}</span><span·class="p">,</span><span·class="w">
206 ····</span><span·class="ss">connection</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">standard_io</span><span·class="p"·data-group-id="5165704447-3">}</span><span·class="p"·data-group-id="5165704447-2">)</span><span·class="p">,</span></code></pre><p>The·following·Common·Test·case·demonstrates·Docker·integration,·starting·two206 ····</span><span·class="ss">connection</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">standard_io</span><span·class="p"·data-group-id="4501598534-3">}</span><span·class="p"·data-group-id="4501598534-2">)</span><span·class="p">,</span></code></pre><p>The·following·Common·Test·case·demonstrates·Docker·integration,·starting·two
207 containers·with·hostnames·&quot;one&quot;·and·&quot;two&quot;.·In·this·example·Erlang·nodes·running207 containers·with·hostnames·&quot;one&quot;·and·&quot;two&quot;.·In·this·example·Erlang·nodes·running
208 inside·containers·form·an·Erlang·cluster.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">docker</span><span·class="p"·data-group-id="4531344607-1">(</span><span·class="n">Config</span><span·class="p"·data-group-id="4531344607-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="4531344607-2">([·...·truncated·by·diffoscope;·len:·77,·SHA:·ab7abaef5ae18e657d10a4614a5491088bd64180d810c869a50bfd47d357dc38·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 inside·containers·form·an·Erlang·cluster.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">docker</span><span·class="p"·data-group-id="9063353622-1">(</span><span·class="n">Config</span><span·class="p"·data-group-id="9063353622-1">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">is_list</span><span·class="p"·data-group-id="9063353622-2">([·...·truncated·by·diffoscope;·len:·77,·SHA:·ef6e37ca9e3fe23ce4bc6eac1c82f88a65ae37afee797aefb968d65383576543·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 ····</span><span·class="n">Docker</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">find_executable</span><span·class="p"·data-group-id="4531344607-3">(</span><span·class="s">&quot;docker&quot;</span><span·class="p"·data-group-id="4531344607-3">)</span><span·class="p">,</span><span·class="w">209 ····</span><span·class="n">Docker</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">os</span><span·class="p">:</span><span·class="nf">find_executable</span><span·class="p"·data-group-id="9063353622-3">(</span><span·class="s">&quot;docker&quot;</span><span·class="p"·data-group-id="9063353622-3">)</span><span·class="p">,</span><span·class="w">
210 ····</span><span·class="n">PrivDir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="4531344607-4">(</span><span·class="ss">priv_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="4531344607-4">)</span><span·class="p">,</span><span·class="w">210 ····</span><span·class="n">PrivDir</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">proplists</span><span·class="p">:</span><span·class="nf">get_value</span><span·class="p"·data-group-id="9063353622-4">(</span><span·class="ss">priv_dir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Config</span><span·class="p"·data-group-id="9063353622-4">)</span><span·class="p">,</span><span·class="w">
211 ····</span><span·class="nf">build_release</span><span·class="p"·data-group-id="4531344607-5">(</span><span·class="n">PrivDir</span><span·class="p"·data-group-id="4531344607-5">)</span><span·class="p">,</span><span·class="w">211 ····</span><span·class="nf">build_release</span><span·class="p"·data-group-id="9063353622-5">(</span><span·class="n">PrivDir</span><span·class="p"·data-group-id="9063353622-5">)</span><span·class="p">,</span><span·class="w">
212 ····</span><span·class="nf">build_image</span><span·class="p"·data-group-id="4531344607-6">(</span><span·class="n">PrivDir</span><span·class="p"·data-group-id="4531344607-6">)</span><span·class="p">,</span><span·class="w">212 ····</span><span·class="nf">build_image</span><span·class="p"·data-group-id="9063353622-6">(</span><span·class="n">PrivDir</span><span·class="p"·data-group-id="9063353622-6">)</span><span·class="p">,</span><span·class="w">
  
213 ····</span><span·class="c1">%%·start·two·Docker·containers</span><span·class="w">213 ····</span><span·class="c1">%%·start·two·Docker·containers</span><span·class="w">
214 ····</span><span·class="p"·data-group-id="4531344607-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="4531344607-7">}</span><span[·...·truncated·by·diffoscope;·len:·247,·SHA:·db22693a2ac592f21c54eec2d323714a34866c5b3aef48f4cae33746dbe76eaf·...·]-9">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">lambda</span><span·class="p">,</span><span·class="w">214 ····</span><span·class="p"·data-group-id="9063353622-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node</span><span·class="p"·data-group-id="9063353622-7">}</span><span[·...·truncated·by·diffoscope;·len:·247,·SHA:·c43b8c22ae914ede20f817865b3ccb79228cb2b158ae2571acd1f01571b37513·...·]-9">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">lambda</span><span·class="p">,</span><span·class="w">
215 ········</span><span·class="ss">connection</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">standard_io</span><span·class="p">,</span><span·class="w">215 ········</span><span·class="ss">connection</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">standard_io</span><span·class="p">,</span><span·class="w">
216 ········</span><span·class="ss">exec</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-10">{</span><span·class="n">Docker</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-11">[</span><span·class="s">&quot;run&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">[·...·truncated·by·diffoscope;·len:·483,·SHA:·fb61fd4743212c975c2e2c011c4d730d2089ce1f6900717246b866383faa50f6·...·]-8">)</span><span·class="p">,</span><span·class="w">216 ········</span><span·class="ss">exec</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-10">{</span><span·class="n">Docker</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-11">[</span><span·class="s">&quot;run&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">[·...·truncated·by·diffoscope;·len:·483,·SHA:·fd4d7d9a8dd750f6d123bab11de8e1aec32c20f5e74849074c7a00ffe87316ca·...·]-8">)</span><span·class="p">,</span><span·class="w">
217 ····</span><span·class="p"·data-group-id="4531344607-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node2</span><span·class="p"·data-group-id="4531344607-12">}</span><[·...·truncated·by·diffoscope;·len:·252,·SHA:·155a748746053b7c2b9dba51c554b63bce89458a04e069a1c088fd911efb1e2b·...·]-14">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">lambda</span><span·class="p">,</span><span·class="w">217 ····</span><span·class="p"·data-group-id="9063353622-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Peer2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Node2</span><span·class="p"·data-group-id="9063353622-12">}</span><[·...·truncated·by·diffoscope;·len:·252,·SHA:·3708d0ebf2a9882f32b5c8b78765e01e08bca0f726886661866787c501c91677·...·]-14">#{</span><span·class="ss">name</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">lambda</span><span·class="p">,</span><span·class="w">
218 ········</span><span·class="ss">connection</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">standard_io</span><span·class="p">,</span><span·class="w">218 ········</span><span·class="ss">connection</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">standard_io</span><span·class="p">,</span><span·class="w">
219 ········</span><span·class="ss">exec</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-15">{</span><span·class="n">Docker</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-16">[</span><span·class="s">&quot;run&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">[·...·truncated·by·diffoscope;·len:·484,·SHA:·dca082b4757d9685033f992e1847eecd0b32ca001e5fdaef53d453b74f3c999c·...·]-13">)</span><span·class="p">,</span><span·class="w">219 ········</span><span·class="ss">exec</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-15">{</span><span·class="n">Docker</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-16">[</span><span·class="s">&quot;run&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">[·...·truncated·by·diffoscope;·len:·484,·SHA:·e17e604823eb7b4a80694beacc90fb752460738a5055b45866db1abab79c8cd9·...·]-13">)</span><span·class="p">,</span><span·class="w">
  
220 ····</span><span·class="c1">%%·find·IP·address·of·the·second·node·using·alternative·connection·RPC</span><span·class="w">220 ····</span><span·class="c1">%%·find·IP·address·of·the·second·node·using·alternative·connection·RPC</span><span·class="w">
221 ····</span><span·class="p"·data-group-id="4531344607-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ips</span><span·class="p"·data-group-id="4531344607-17">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·510,·SHA:·75fef791cd63154f92361c26e92151a1eb8b7dd6795621db0c2d3c4686d5016e·...·]-18">)</span><span·class="p">,</span><span·class="w">221 ····</span><span·class="p"·data-group-id="9063353622-17">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ips</span><span·class="p"·data-group-id="9063353622-17">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·510,·SHA:·9446fb11d47bc385ccfcf68faf70953d0a38799c08e746417fe731089e9df665·...·]-18">)</span><span·class="p">,</span><span·class="w">
222 ····</span><span·class="p"·data-group-id="4531344607-20">{</span><span·class="s">&quot;eth0&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Eth0</span><span·class="p"·data-group-id="4531344607-20">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·372,·SHA:·5584a12dc2cff687289665a5bc8b863b189fd957c67e407e205c6a11223051a6·...·]-21">)</span><span·class="p">,</span><span·class="w">222 ····</span><span·class="p"·data-group-id="9063353622-20">{</span><span·class="s">&quot;eth0&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Eth0</span><span·class="p"·data-group-id="9063353622-20">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·372,·SHA:·588eb1e833c085aeec2d2e1bf90089d3102dfe9809399555ea6606cd9b9edcbc·...·]-21">)</span><span·class="p">,</span><span·class="w">
223 ····</span><span·class="p"·data-group-id="4531344607-22">{</span><span·class="ss">addr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ip</span><span·class="p"·data-group-id="4531344607-22">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·349,·SHA:·3ede5812a1a5d9c7a4d3564a3b592b615a93c33f1ccbf8a154cf6f0d5ae258c2·...·]-23">)</span><span·class="p">,</span><span·class="w">223 ····</span><span·class="p"·data-group-id="9063353622-22">{</span><span·class="ss">addr</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ip</span><span·class="p"·data-group-id="9063353622-22">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·349,·SHA:·27593470881ccc68aea009a687eea5bd6369c896dac0e841f302c3da926f40ea·...·]-23">)</span><span·class="p">,</span><span·class="w">
  
224 ····</span><span·class="c1">%%·make·first·node·to·discover·second·one</span><span·class="w">224 ····</span><span·class="c1">%%·make·first·node·to·discover·second·one</span><span·class="w">
225 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="4531344607-24">(</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inet_db</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">set_lookup</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·288,·SHA:·52f12ce6c9446e64dc826efcae08934c191f4d222b74e28bd44ef4a64e996234·...·]-24">)</span><span·class="p">,</span><span·class="w">225 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9063353622-24">(</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inet_db</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">set_lookup</span><span·class="p">,</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·288,·SHA:·3f7915d9c68d36ea06c57d919be6d90accf3be7d63e16a5bf4e56e7a5bcd0a87·...·]-24">)</span><span·class="p">,</span><span·class="w">
226 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="4531344607-27">(</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inet_db</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">add_host</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·369,·SHA:·b90610f704025088d17b095987914d5f42c64098843d0560b236080f1a67a3c3·...·]-27">)</span><span·class="p">,</span><span·class="w">226 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9063353622-27">(</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">inet_db</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">add_host</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·369,·SHA:·c8374944560b8b571fc6ba959c2240d19cbbb6043500fc4750b6a500749b9201·...·]-27">)</span><span·class="p">,</span><span·class="w">
  
227 ····</span><span·class="c1">%%·join·a·cluster</span><span·class="w">227 ····</span><span·class="c1">%%·join·a·cluster</span><span·class="w">
228 ····</span><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="4531344607-30">(</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">net_kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">connect_node</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·185,·SHA:·73f6ba98760118ec630adf929e5fdde3140dd7cf417c7d134b892db01a482de1·...·]-30">)</span><span·class="p">,</span><span·class="w">228 ····</span><span·class="ss">true</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9063353622-30">(</span><span·class="n">Peer</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">net_kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">connect_node</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·185,·SHA:·22c1eef1172b833056a97421fa7ea58b09fa553bc80afe1a86cd08604c40163b·...·]-30">)</span><span·class="p">,</span><span·class="w">
229 ····</span><span·class="c1">%%·verify·that·second·peer·node·has·only·the·first·node·visible</span><span·class="w">229 ····</span><span·class="c1">%%·verify·that·second·peer·node·has·only·the·first·node·visible</span><span·class="w">
230 ····</span><span·class="p"·data-group-id="4531344607-32">[</span><span·class="n">Node</span><span·class="p"·data-group-id="4531344607-32">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span>[·...·truncated·by·diffoscope;·len:·434,·SHA:·fd5d4ea39b50d435d68baf6156416392abb18ffa0e08a63e10c675ea14bd5648·...·]-33">)</span><span·class="p">,</span><span·class="w">230 ····</span><span·class="p"·data-group-id="9063353622-32">[</span><span·class="n">Node</span><span·class="p"·data-group-id="9063353622-32">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">call</span>[·...·truncated·by·diffoscope;·len:·434,·SHA:·2968b8249ae9f191e2ab7747d413db1acd71a277bb16de0641f7fe9dd5801410·...·]-33">)</span><span·class="p">,</span><span·class="w">
  
231 ····</span><span·class="c1">%%·stop·peers,·causing·containers·to·also·stop</span><span·class="w">231 ····</span><span·class="c1">%%·stop·peers,·causing·containers·to·also·stop</span><span·class="w">
232 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="4531344607-35">(</span><span·class="n">Peer2</span><span·class="p"·data-group-id="4531344607-35">)</span><span·class="p">,</span><span·class="w">232 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9063353622-35">(</span><span·class="n">Peer2</span><span·class="p"·data-group-id="9063353622-35">)</span><span·class="p">,</span><span·class="w">
233 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="4531344607-36">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="4531344607-36">)</span><span·class="p">.</span><span·class="w">233 ····</span><span·class="nc">peer</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="9063353622-36">(</span><span·class="n">Peer</span><span·class="p"·data-group-id="9063353622-36">)</span><span·class="p">.</span><span·class="w">
  
234 </span><span·class="nf">build_release</span><span·class="p"·data-group-id="4531344607-37">(</span><span·class="n">Dir</span><span·class="p"·data-group-id="4531344607-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">234 </span><span·class="nf">build_release</span><span·class="p"·data-group-id="9063353622-37">(</span><span·class="n">Dir</span><span·class="p"·data-group-id="9063353622-37">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
235 ····</span><span·class="c1">%%·load·sasl.app·file,·otherwise·application:get_key·will·fail</span><span·class="w">235 ····</span><span·class="c1">%%·load·sasl.app·file,·otherwise·application:get_key·will·fail</span><span·class="w">
236 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">load</span><span·class="p"·data-group-id="4531344607-38">(</span><span·class="ss">sasl</span><span·class="p"·data-group-id="4531344607-38">)</span><span·class="p">,</span><span·class="w">236 ····</span><span·class="nc">application</span><span·class="p">:</span><span·class="nf">load</span><span·class="p"·data-group-id="9063353622-38">(</span><span·class="ss">sasl</span><span·class="p"·data-group-id="9063353622-38">)</span><span·class="p">,</span><span·class="w">
237 ····</span><span·class="c1">%%·create·*.rel·-·release·file</span><span·class="w">237 ····</span><span·class="c1">%%·create·*.rel·-·release·file</span><span·class="w">
238 ····</span><span·class="n">RelFile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="4531344607-39">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;lambda.rel&quot;</span><span·class="p"·data-group-id="4531344607-39">)</span><span·class="p">,</span><span·class="w">238 ····</span><span·class="n">RelFile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="9063353622-39">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;lambda.rel&quot;</span><span·class="p"·data-group-id="9063353622-39">)</span><span·class="p">,</span><span·class="w">
239 ····</span><span·class="n">Release</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-40">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-41">{</span><span·class="s">&quot;lambda&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·70,·SHA:·ea9f2c989d4bf68c714ce4ed4fd8981e34e41bbf0e9d144cefd1b6aa66d11c32·...·]-41">}</span><span·class="p">,</span><span·class="w">239 ····</span><span·class="n">Release</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-40">{</span><span·class="ss">release</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-41">{</span><span·class="s">&quot;lambda&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·70,·SHA:·00e4f7d6419be1c4e995dd27e41396f65e1deb5de0ae6440fa6491e6d4397014·...·]-41">}</span><span·class="p">,</span><span·class="w">
240 ········</span><span·class="p"·data-group-id="4531344607-42">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="4531344607-43">(</span><span·class="s[·...·truncated·by·diffoscope;·len:·112,·SHA:·daded2de216f79b88f378c86a62bc345eba44e20d5e8950fc7f6492d981695b2·...·]-42">}</span><span·class="p">,</span><span·class="w">240 ········</span><span·class="p"·data-group-id="9063353622-42">{</span><span·class="ss">erts</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="9063353622-43">(</span><span·class="s[·...·truncated·by·diffoscope;·len:·112,·SHA:·c0082118432190d582d6b434b24ac61030290c21f527a2306ff088fb2018ab11·...·]-42">}</span><span·class="p">,</span><span·class="w">
241 ········</span><span·class="p"·data-group-id="4531344607-44">[</span><span·class="p"·data-group-id="4531344607-45">{</span><span·class="n">App</span><span·class="p">,</span><span·class="w">·</span><span·class="k">begin</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-46">{</span[·...·truncated·by·diffoscope;·len:·691,·SHA:·f5e176e2da1a4cf3cf7e1d5d6bd8c861024b9fed3e00074b49eedde3d5198db2·...·]-45">}</span><span·class="w">241 ········</span><span·class="p"·data-group-id="9063353622-44">[</span><span·class="p"·data-group-id="9063353622-45">{</span><span·class="n">App</span><span·class="p">,</span><span·class="w">·</span><span·class="k">begin</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-46">{</span[·...·truncated·by·diffoscope;·len:·691,·SHA:·06342b9950953c635c72433d153a34d59b77ddfef2a010bc9a630d140764812d·...·]-45">}</span><span·class="w">
242 ············</span><span·class="p">||</span><span·class="w">·</span><span·class="n">App</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-48">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sasl</span><span·class="p"·data-group-id="4531344607-48">]</[·...·truncated·by·diffoscope;·len:·100,·SHA:·87e49c8dfaa6476c71069f844c1d5e8438dfddf92b10819ce7b2917fcc32eed6·...·]-40">}</span><span·class="p">,</span><span·class="w">242 ············</span><span·class="p">||</span><span·class="w">·</span><span·class="n">App</span><span·class="w">·</span><span·class="o">&lt;-</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-48">[</span><span·class="ss">kernel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stdlib</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">sasl</span><span·class="p"·data-group-id="9063353622-48">]</[·...·truncated·by·diffoscope;·len:·100,·SHA:·53785d5baccd8ffa7f40fdc99183022465eff2d810d95fbfba14889d70881037·...·]-40">}</span><span·class="p">,</span><span·class="w">
243 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write_file</span><span·class="p"·data-group-id="4531344607-49">(</span><span·class="n">RelFile</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="4531344607-50">(</span><span·class="nc">lists</span><span·class="p">:</span><span·clas[·...·truncated·by·diffoscope;·len:·62,·SHA:·6b17067a4197e37ef66366bc70c8dcfb938bd2e9f0536e9b598db7b211df534f·...·]-51">(</span><span·class="w">243 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write_file</span><span·class="p"·data-group-id="9063353622-49">(</span><span·class="n">RelFile</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_binary</span><span·class="p"·data-group-id="9063353622-50">(</span><span·class="nc">lists</span><span·class="p">:</span><span·clas[·...·truncated·by·diffoscope;·len:·62,·SHA:·dabc7fdf4f4da48e0c042fb4cc7ecea94a5a124d40199d362794eed24034c653·...·]-51">(</span><span·class="w">
244 ········</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="4531344607-52">(</span><span·class="s">&quot;~tp.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-53">[</span><span·class="n">Release</span><span·class="p"·data-group-id="4531344607-53">]</span><span·cl[·...·truncated·by·diffoscope;·len:·195,·SHA:·153e48e0e7a8c33854c5031872d8c5bf64a431b6119d9cc1ee412997d698c7da·...·]-49">)</span><span·class="p">,</span><span·class="w">244 ········</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9063353622-52">(</span><span·class="s">&quot;~tp.&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-53">[</span><span·class="n">Release</span><span·class="p"·data-group-id="9063353622-53">]</span><span·cl[·...·truncated·by·diffoscope;·len:·195,·SHA:·4b7f5050afa2d61cedee15a8aaae2971a5b04518a854a5b9ff36ff8f359301fe·...·]-49">)</span><span·class="p">,</span><span·class="w">
245 ····</span><span·class="n">RelFileNoExt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="4531344607-54">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;lambda&quot;</span><span·class="p"·data-group-id="4531344607-54">)</span><span·class="p">,</span><span·class="w">245 ····</span><span·class="n">RelFileNoExt</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="9063353622-54">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;lambda&quot;</span><span·class="p"·data-group-id="9063353622-54">)</span><span·class="p">,</span><span·class="w">
  
246 ····</span><span·class="c1">%%·create·boot·script</span><span·class="w">246 ····</span><span·class="c1">%%·create·boot·script</span><span·class="w">
247 ····</span><span·class="p"·data-group-id="4531344607-55">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">systools_make</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-56">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·292,·SHA:·8e5ccd561d0f39da274e426131b3f74a7aad8f44f78ab7808c0cd0b5ce26215f·...·]-57">(</span><span·class="n">RelFileNoExt</span><span·class="p">,</span><span·class="w">247 ····</span><span·class="p"·data-group-id="9063353622-55">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">systools_make</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-56">[</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·292,·SHA:·715787bd28a6d6b6a151e2ec3709e4cd13776c71465ec252717e27fa94092208·...·]-57">(</span><span·class="n">RelFileNoExt</span><span·class="p">,</span><span·class="w">
248 ········</span><span·class="p"·data-group-id="4531344607-58">[</span><span·class="ss">silent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-59">{</span><span·class="ss">outdir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dir</sp[·...·truncated·by·diffoscope;·len:·152,·SHA:·864f5821bb27b1c92cc01acb0ae3777b0947e89ae5a84e287a925d9b05882702·...·]-57">)</span><span·class="p">,</span><span·class="w">248 ········</span><span·class="p"·data-group-id="9063353622-58">[</span><span·class="ss">silent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-59">{</span><span·class="ss">outdir</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Dir</sp[·...·truncated·by·diffoscope;·len:·152,·SHA:·cb3e70f0622cb5fd62ff4baea3ab48cbbe0d7e2427d1e51e04ab38c523ade34e·...·]-57">)</span><span·class="p">,</span><span·class="w">
249 ····</span><span·class="c1">%%·package·release·into·*.tar.gz</span><span·class="w">249 ····</span><span·class="c1">%%·package·release·into·*.tar.gz</span><span·class="w">
250 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">systools</span><span·class="p">:</span><span·class="nf">make_tar</span><span·class="p"·data-group-id="4531344607-60">(</span><span·class="n">RelFileNoExt</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4531344607-61">[</span><span·class="p"·data-group-id="4531344607-62">{</span><span·class="ss">erts</span><span·class="p[·...·truncated·by·diffoscope;·len:·375,·SHA:·406d8f83f48ccb3bfb332c02cc2924d34797f3e71d6064d94da80c8f83fb9582·...·]-60">)</span><span·class="p">.</span><span·class="w">250 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">systools</span><span·class="p">:</span><span·class="nf">make_tar</span><span·class="p"·data-group-id="9063353622-60">(</span><span·class="n">RelFileNoExt</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9063353622-61">[</span><span·class="p"·data-group-id="9063353622-62">{</span><span·class="ss">erts</span><span·class="p[·...·truncated·by·diffoscope;·len:·375,·SHA:·13b8717d4e8a0260786a46440c98f8c10f84f5f6000f8a1822d34edabd8d2153·...·]-60">)</span><span·class="p">.</span><span·class="w">
  
251 </span><span·class="nf">build_image</span><span·class="p"·data-group-id="4531344607-64">(</span><span·class="n">Dir</span><span·class="p"·data-group-id="4531344607-64">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">251 </span><span·class="nf">build_image</span><span·class="p"·data-group-id="9063353622-64">(</span><span·class="n">Dir</span><span·class="p"·data-group-id="9063353622-64">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
252 ····</span><span·class="c1">%%·Create·Dockerfile·example,·working·only·for·Ubuntu·20.04</span><span·class="w">252 ····</span><span·class="c1">%%·Create·Dockerfile·example,·working·only·for·Ubuntu·20.04</span><span·class="w">
253 ····</span><span·class="c1">%%·Expose·port·4445,·and·make·Erlang·distribution·to·listen</span><span·class="w">253 ····</span><span·class="c1">%%·Expose·port·4445,·and·make·Erlang·distribution·to·listen</span><span·class="w">
254 ····</span><span·class="c1">%%··on·this·port,·and·connect·to·it·without·EPMD</span><span·class="w">254 ····</span><span·class="c1">%%··on·this·port,·and·connect·to·it·without·EPMD</span><span·class="w">
255 ····</span><span·class="c1">%%·Set·cookie·on·both·nodes·to·be·the·same.</span><span·class="w">255 ····</span><span·class="c1">%%·Set·cookie·on·both·nodes·to·be·the·same.</span><span·class="w">
256 ····</span><span·class="n">BuildScript</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="4531344607-65">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Dockerfile&quot;</span><span·class="p"·data-group-id="4531344607-65">)</span><span·class="p">,</span><span·class="w">256 ····</span><span·class="n">BuildScript</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">filename</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="9063353622-65">(</span><span·class="n">Dir</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Dockerfile&quot;</span><span·class="p"·data-group-id="9063353622-65">)</span><span·class="p">,</span><span·class="w">
257 ····</span><span·class="n">Dockerfile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">257 ····</span><span·class="n">Dockerfile</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
258 ······</span><span·class="s">&quot;FROM·ubuntu:20.04·as·runner\n&quot;</span><span·class="w">258 ······</span><span·class="s">&quot;FROM·ubuntu:20.04·as·runner\n&quot;</span><span·class="w">
259 ······</span><span·class="s">&quot;EXPOSE·4445\n&quot;</span><span·class="w">259 ······</span><span·class="s">&quot;EXPOSE·4445\n&quot;</span><span·class="w">
260 ······</span><span·class="s">&quot;WORKDIR·/opt/lambda\n&quot;</span><span·class="w">260 ······</span><span·class="s">&quot;WORKDIR·/opt/lambda\n&quot;</span><span·class="w">
261 ······</span><span·class="s">&quot;COPY·lambda.tar.gz·/tmp\n&quot;</span><span·class="w">261 ······</span><span·class="s">&quot;COPY·lambda.tar.gz·/tmp\n&quot;</span><span·class="w">
262 ······</span><span·class="s">&quot;RUN·tar·-zxvf·/tmp/lambda.tar.gz·-C·/opt/lambda\n&quot;</span><span·class="w">262 ······</span><span·class="s">&quot;RUN·tar·-zxvf·/tmp/lambda.tar.gz·-C·/opt/lambda\n&quot;</span><span·class="w">
263 ······</span><span·class="s">&quot;ENTRYPOINT·[\&quot;/opt/lambda/erts-&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="4531344607-66">(</span><span·class="ss">version</span><span·class="p"·data-group-id="4531344607-66">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">263 ······</span><span·class="s">&quot;ENTRYPOINT·[\&quot;/opt/lambda/erts-&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">system_info</span><span·class="p"·data-group-id="9063353622-66">(</span><span·class="ss">version</span><span·class="p"·data-group-id="9063353622-66">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">
264 ······</span><span·class="s">&quot;/bin/dyn_erl\&quot;,·\&quot;-boot\&quot;,·\&quot;/opt/lambda/releases/1.0.0/start\&quot;,&quot;</span><span·class="w">264 ······</span><span·class="s">&quot;/bin/dyn_erl\&quot;,·\&quot;-boot\&quot;,·\&quot;/opt/lambda/releases/1.0.0/start\&quot;,&quot;</span><span·class="w">
265 ······</span><span·class="s">&quot;·\&quot;-kernel\&quot;,·\&quot;inet_dist_listen_min\&quot;,·\&quot;4445\&quot;,&quot;</span><span·class="w">265 ······</span><span·class="s">&quot;·\&quot;-kernel\&quot;,·\&quot;inet_dist_listen_min\&quot;,·\&quot;4445\&quot;,&quot;</span><span·class="w">
266 ······</span><span·class="s">&quot;·\&quot;-erl_epmd_port\&quot;,·\&quot;4445\&quot;,&quot;</span><span·class="w">266 ······</span><span·class="s">&quot;·\&quot;-erl_epmd_port\&quot;,·\&quot;4445\&quot;,&quot;</span><span·class="w">
267 ······</span><span·class="s">&quot;·\&quot;-setcookie\&quot;,·\&quot;secret\&quot;]\n&quot;</span><span·class="p">,</span><span·class="w">267 ······</span><span·class="s">&quot;·\&quot;-setcookie\&quot;,·\&quot;secret\&quot;]\n&quot;</span><span·class="p">,</span><span·class="w">
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495 ······<p·class="built-using">495 ······<p·class="built-using">
496 ········Built·using496 ········Built·using
497 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the497 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
498 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>498 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
499 ······</p>499 ······</p>
500 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>500 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
501 ····</footer>501 ····</footer>
502 ··</div>502 ··</div>
503 </main>503 </main>
504 </div>504 </div>
505 <script>505 <script>
506 ··function·mermaidLoaded()·{506 ··function·mermaidLoaded()·{
507 ····mermaid.initialize({507 ····mermaid.initialize({
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969 the·start·function·used.</p><p>If·neither·this·function·nor·<a·href="#init_fail/3"><code·class="inline">init_fail/2,3</code></a>·is·called·by·the969 the·start·function·used.</p><p>If·neither·this·function·nor·<a·href="#init_fail/3"><code·class="inline">init_fail/2,3</code></a>·is·called·by·the
970 started·process,·the·start·function·returns·an·error·tuple·when·the·started970 started·process,·the·start·function·returns·an·error·tuple·when·the·started
971 process·exits,·or·when·the·start·function·time-out·(if·used)·has·passed,·see971 process·exits,·or·when·the·start·function·time-out·(if·used)·has·passed,·see
972 <a·href="#start/5"><code·class="inline">start/3,4,5</code></a>.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Do·not·use·this·function·to·return·an·error·indicating·that·the·process·start972 <a·href="#start/5"><code·class="inline">start/3,4,5</code></a>.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Do·not·use·this·function·to·return·an·error·indicating·that·the·process·start
973 failed.·When·doing·so·the·start·function·can·return·before·the·failing·process973 failed.·When·doing·so·the·start·function·can·return·before·the·failing·process
974 has·exited,·which·may·block·VM·resources·required·for·a·new·start·attempt·to974 has·exited,·which·may·block·VM·resources·required·for·a·new·start·attempt·to
975 succeed.·Use·<a·href="#init_fail/3"><code·class="inline">init_fail/2,3</code></a>·for·that·purpose.</p></section><p>The·following·example·illustrates·how·this·function·and·<a·href="#start_link/3"><code·class="inline">proc_lib:start_link/3</code></a>975 succeed.·Use·<a·href="#init_fail/3"><code·class="inline">init_fail/2,3</code></a>·for·that·purpose.</p></section><p>The·following·example·illustrates·how·this·function·and·<a·href="#start_link/3"><code·class="inline">proc_lib:start_link/3</code></a>
976 are·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6227617112-1">(</span><span·class="ss">my_proc</span><span·class="p"·data-group-id="6227617112-1">)</span><span·class="p">.</span><span·class="w">976 are·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="2048587567-1">(</span><span·class="ss">my_proc</span><span·class="p"·data-group-id="2048587567-1">)</span><span·class="p">.</span><span·class="w">
977 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6227617112-2">(</span><span·class="p"·data-group-id="6227617112-3">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6227617112-3">]</span><span·class="p"·data-group-id="6227617112-2">)</span><span·class="p">.</span><span·class="w"> 
978 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6227617112-4">(</span><span·class="p"·data-group-id="6227617112-5">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6227617112-5">]</span><span·class="p"·data-group-id="6227617112-4">)</span><span·class="p">.</span><span·class="w">977 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2048587567-2">(</span><span·class="p"·data-group-id="2048587567-3">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="2048587567-3">]</span><span·class="p"·data-group-id="2048587567-2">)</span><span·class="p">.</span><span·class="w">
 978 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="2048587567-4">(</span><span·class="p"·data-group-id="2048587567-5">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="2048587567-5">]</span><span·class="p"·data-group-id="2048587567-4">)</span><span·class="p">.</span><span·class="w">
  
979 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="6227617112-6">(</span><span·class="p"·data-group-id="6227617112-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">979 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="2048587567-6">(</span><span·class="p"·data-group-id="2048587567-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
980 ····</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="6227617112-7">(</span><span·class="ss">my_proc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6227617112-8">[</span><span·class="nf">self</spa[·...·truncated·by·diffoscope;·len:·202,·SHA:·cbca49915071c7a79d6a8f30dc67ddab55f3a6ea208f3f53a9057eb93a86ccfe·...·]-7">)</span><span·class="p">.</span><span·class="w">980 ····</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="2048587567-7">(</span><span·class="ss">my_proc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2048587567-8">[</span><span·class="nf">self</spa[·...·truncated·by·diffoscope;·len:·202,·SHA:·62cd87b7c105f065e57f77e22356544b3836dd667f0542c17e7f57fb66218ea0·...·]-7">)</span><span·class="p">.</span><span·class="w">
  
981 </span><span·class="nf">init</span><span·class="p"·data-group-id="6227617112-10">(</span><span·class="n">Parent</span><span·class="p"·data-group-id="6227617112-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">981 </span><span·class="nf">init</span><span·class="p"·data-group-id="2048587567-10">(</span><span·class="n">Parent</span><span·class="p"·data-group-id="2048587567-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
982 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">do_initialization</span><span·class="p"·data-group-id="6227617112-11">(</span><span·class="p"·data-group-id="6227617112-11">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">982 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">do_initialization</span><span·class="p"·data-group-id="2048587567-11">(</span><span·class="p"·data-group-id="2048587567-11">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
983 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">983 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
984 ············</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">init_ack</span><span·class="p"·data-group-id="6227617112-12">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6227617112-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span>[·...·truncated·by·diffoscope;·len:·203,·SHA:·ec6a2db42f08e438b311d4818ae7971736a3b35f9074c2b30160ada8553c6884·...·]-12">)</span><span·class="p">;</span><span·class="w">984 ············</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">init_ack</span><span·class="p"·data-group-id="2048587567-12">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2048587567-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span>[·...·truncated·by·diffoscope;·len:·203,·SHA:·64ce3272fe8922d31e24cc40e4988d86851b23de060da45430d4203bb98b863f·...·]-12">)</span><span·class="p">;</span><span·class="w">
985 ········</span><span·class="p"·data-group-id="6227617112-15">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="6227617112-15">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">985 ········</span><span·class="p"·data-group-id="2048587567-15">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="2048587567-15">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
986 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="6227617112-16">(</span><span·class="n">Reason</span><span·class="p"·data-group-id="6227617112-16">)</span><span·class="w">986 ············</span><span·class="nf">exit</span><span·class="p"·data-group-id="2048587567-16">(</span><span·class="n">Reason</span><span·class="p"·data-group-id="2048587567-16">)</span><span·class="w">
987 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">987 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
988 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="6227617112-17">(</span><span·class="p"·data-group-id="6227617112-17">)</span><span·class="p">.</span><span·class="w">988 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="2048587567-17">(</span><span·class="p"·data-group-id="2048587567-17">)</span><span·class="p">.</span><span·class="w">
  
989 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>989 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>
990 ··</section>990 ··</section>
991 </section>991 </section>
992 <section·class="detail"·id="init_fail/2">992 <section·class="detail"·id="init_fail/2">
  
993 ··<div·class="detail-header">993 ··<div·class="detail-header">
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1052 to·<code·class="inline">Exception</code>.·The·start·function·then·returns·<code·class="inline">Ret</code>.</p><p>See·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#raise/3"><code·class="inline">erlang:raise/3</code></a>·for·a·description·of·<code·class="inline">Class</code>,·<code·class="inline">Reason</code>·and·<code·class="inline">Stacktrace</code>.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Do·not·consider·catching·the·exception·from·this·function.·That·would·defeat1052 to·<code·class="inline">Exception</code>.·The·start·function·then·returns·<code·class="inline">Ret</code>.</p><p>See·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#raise/3"><code·class="inline">erlang:raise/3</code></a>·for·a·description·of·<code·class="inline">Class</code>,·<code·class="inline">Reason</code>·and·<code·class="inline">Stacktrace</code>.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>Do·not·consider·catching·the·exception·from·this·function.·That·would·defeat
1053 its·purpose.·A·process·started·by·a·<a·href="#start/3"><code·class="inline">start[_link|_monitor]/3,4,5</code></a>1053 its·purpose.·A·process·started·by·a·<a·href="#start/3"><code·class="inline">start[_link|_monitor]/3,4,5</code></a>
1054 function·should·end·in·a·value·(that·will·be·ignored)·or·an·exception·that1054 function·should·end·in·a·value·(that·will·be·ignored)·or·an·exception·that
1055 will·be·handled·by·this·module.·See·<a·href="proc_lib.html">Description</a>.</p></section><p>If·neither·this·function·nor·<a·href="#init_ack/1"><code·class="inline">init_ack/1,2</code></a>·is·called·by·the1055 will·be·handled·by·this·module.·See·<a·href="proc_lib.html">Description</a>.</p></section><p>If·neither·this·function·nor·<a·href="#init_ack/1"><code·class="inline">init_ack/1,2</code></a>·is·called·by·the
1056 started·process,·the·start·function·returns·an·error·tuple·when·the·started1056 started·process,·the·start·function·returns·an·error·tuple·when·the·started
1057 process·exits,·or·when·the·start·function·time-out·(if·used)·has·passed,·see1057 process·exits,·or·when·the·start·function·time-out·(if·used)·has·passed,·see
1058 <a·href="#start/3"><code·class="inline">start/3,4,5</code></a>.</p><p>The·following·example·illustrates·how·this·function·and·<a·href="#start_link/3"><code·class="inline">proc_lib:start_link/3</code></a>1058 <a·href="#start/3"><code·class="inline">start/3,4,5</code></a>.</p><p>The·following·example·illustrates·how·this·function·and·<a·href="#start_link/3"><code·class="inline">proc_lib:start_link/3</code></a>
1059 can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4705563975-1">(</span><span·class="ss">my_proc</span><span·class="p"·data-group-id="4705563975-1">)</span><span·class="p">.</span><span·class="w">1059 can·be·used:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8239239588-1">(</span><span·class="ss">my_proc</span><span·class="p"·data-group-id="8239239588-1">)</span><span·class="p">.</span><span·class="w">
1060 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4705563975-2">(</span><span·class="p"·data-group-id="4705563975-3">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4705563975-3">]</span><span·class="p"·data-group-id="4705563975-2">)</span><span·class="p">.</span><span·class="w"> 
1061 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4705563975-4">(</span><span·class="p"·data-group-id="4705563975-5">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="4705563975-5">]</span><span·class="p"·data-group-id="4705563975-4">)</span><span·class="p">.</span><span·class="w">1060 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8239239588-2">(</span><span·class="p"·data-group-id="8239239588-3">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="8239239588-3">]</span><span·class="p"·data-group-id="8239239588-2">)</span><span·class="p">.</span><span·class="w">
 1061 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8239239588-4">(</span><span·class="p"·data-group-id="8239239588-5">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="8239239588-5">]</span><span·class="p"·data-group-id="8239239588-4">)</span><span·class="p">.</span><span·class="w">
  
1062 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="4705563975-6">(</span><span·class="p"·data-group-id="4705563975-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1062 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="8239239588-6">(</span><span·class="p"·data-group-id="8239239588-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1063 ····</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="4705563975-7">(</span><span·class="ss">my_proc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4705563975-8">[</span><span·class="nf">self</spa[·...·truncated·by·diffoscope;·len:·202,·SHA:·8b25ca383f5ffd159e43224f68d64085f9b634a0d8c0c8e36564594342d5dac8·...·]-7">)</span><span·class="p">.</span><span·class="w">1063 ····</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="8239239588-7">(</span><span·class="ss">my_proc</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">init</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8239239588-8">[</span><span·class="nf">self</spa[·...·truncated·by·diffoscope;·len:·202,·SHA:·2e7563cf7a9d024ae63528af83c97c7e2f170203d9c6f40eb89df2e45d22eb9c·...·]-7">)</span><span·class="p">.</span><span·class="w">
  
1064 </span><span·class="nf">init</span><span·class="p"·data-group-id="4705563975-10">(</span><span·class="n">Parent</span><span·class="p"·data-group-id="4705563975-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1064 </span><span·class="nf">init</span><span·class="p"·data-group-id="8239239588-10">(</span><span·class="n">Parent</span><span·class="p"·data-group-id="8239239588-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1065 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">do_initialization</span><span·class="p"·data-group-id="4705563975-11">(</span><span·class="p"·data-group-id="4705563975-11">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">1065 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nf">do_initialization</span><span·class="p"·data-group-id="8239239588-11">(</span><span·class="p"·data-group-id="8239239588-11">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
1066 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1066 ········</span><span·class="ss">ok</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1067 ············</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">init_ack</span><span·class="p"·data-group-id="4705563975-12">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4705563975-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span>[·...·truncated·by·diffoscope;·len:·203,·SHA:·b9b30c45c1a44d94207cf771ebf498a25db50387e64cf47d48c54d90df0417c2·...·]-12">)</span><span·class="p">;</span><span·class="w">1067 ············</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">init_ack</span><span·class="p"·data-group-id="8239239588-12">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8239239588-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span>[·...·truncated·by·diffoscope;·len:·203,·SHA:·1e2d024c08e8aedc65b4a376a5e00e88b3ef8515e5aa12ee64476f0a1357bfa2·...·]-12">)</span><span·class="p">;</span><span·class="w">
1068 ········</span><span·class="p"·data-group-id="4705563975-15">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="4705563975-15">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1068 ········</span><span·class="p"·data-group-id="8239239588-15">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Reason</span><span·class="p"·data-group-id="8239239588-15">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Error</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1069 ············</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">init_fail</span><span·class="p"·data-group-id="4705563975-16">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4705563975-17">{</span><span·class="nb">exit</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·adf746447a0336d2e8b0aa5e763b50a89ac47238c666416e71f37f47254e66d8·...·]-16">)</span><span·class="w">1069 ············</span><span·class="nc">proc_lib</span><span·class="p">:</span><span·class="nf">init_fail</span><span·class="p"·data-group-id="8239239588-16">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Error</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8239239588-17">{</span><span·class="nb">exit</spa[·...·truncated·by·diffoscope;·len:·175,·SHA:·bb8248840359b01e66b4e470fdf27571186c6cb72835973b6003952033c86f52·...·]-16">)</span><span·class="w">
1070 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">1070 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
1071 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="4705563975-18">(</span><span·class="p"·data-group-id="4705563975-18">)</span><span·class="p">.</span><span·class="w">1071 ····</span><span·class="nf">loop</span><span·class="p"·data-group-id="8239239588-18">(</span><span·class="p"·data-group-id="8239239588-18">)</span><span·class="p">.</span><span·class="w">
  
1072 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>1072 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre>
1073 ··</section>1073 ··</section>
1074 </section>1074 </section>
1075 <section·class="detail"·id="initial_call/1">1075 <section·class="detail"·id="initial_call/1">
  
1076 ··<div·class="detail-header">1076 ··<div·class="detail-header">
Offset 1948, 15 lines modifiedOffset 1948, 15 lines modified
1948 ······<p·class="built-using">1948 ······<p·class="built-using">
1949 ········Built·using1949 ········Built·using
1950 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1950 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1951 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1951 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1952 ······</p>1952 ······</p>
1953 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1953 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1954 ····</footer>1954 ····</footer>
1955 ··</div>1955 ··</div>
1956 </main>1956 </main>
1957 </div>1957 </div>
1958 <script>1958 <script>
1959 ··function·mermaidLoaded()·{1959 ··function·mermaidLoaded()·{
1960 ····mermaid.initialize({1960 ····mermaid.initialize({
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Offset 522, 15 lines modifiedOffset 522, 15 lines modified
  
522 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append_values(Key,·ListIn)·->·ListOut·when·Key·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·ListIn·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],·ListOut·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>522 ··········<pre·translate="no"><span·class="attribute">-spec</span>·append_values(Key,·ListIn)·->·ListOut·when·Key·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>(),·ListIn·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],·ListOut·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>
  
523 ······</div>523 ······</div>
  
524 <p>Similar·to·<a·href="#get_all_values/2"><code·class="inline">get_all_values/2</code></a>,·but·each·value·is·wrapped·in·a·list·unless·it·is524 <p>Similar·to·<a·href="#get_all_values/2"><code·class="inline">get_all_values/2</code></a>,·but·each·value·is·wrapped·in·a·list·unless·it·is
525 already·itself·a·list.·The·resulting·list·of·lists·is·concatenated.·This·is525 already·itself·a·list.·The·resulting·list·of·lists·is·concatenated.·This·is
526 often·useful·for·&quot;incremental&quot;·options.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append_values</span><span·class="p"·data-group-id="4723168455-1">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4723168455-2">[</span><span·class="p"·data-group-id="4723168455-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·1837,·SHA:·84e321080108be4a6cfc7ca911d1c3eebecf0d0b792626bd6d7cc0a45b07f66d·...·]-1">]</span></code></pre>526 often·useful·for·&quot;incremental&quot;·options.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">append_values</span><span·class="p"·data-group-id="6855306024-1">(</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6855306024-2">[</span><span·class="p"·data-group-id="6855306024-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·1837,·SHA:·6d4f570920e2a34fddef60a01f516cfa09fcc5d7182c4c7534078e4ab9dc9974·...·]-1">]</span></code></pre>
527 ··</section>527 ··</section>
528 </section>528 </section>
529 <section·class="detail"·id="compact/1">529 <section·class="detail"·id="compact/1">
  
530 ··<div·class="detail-header">530 ··<div·class="detail-header">
531 ····<a·href="#compact/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">531 ····<a·href="#compact/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
532 ······<i·class="ri-link-m"·aria-hidden="true"></i>532 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 610, 18 lines modifiedOffset 610, 18 lines modified
610 ······</div>610 ······</div>
  
611 <p>Expands·particular·properties·to·corresponding·sets·of·properties·(or·other611 <p>Expands·particular·properties·to·corresponding·sets·of·properties·(or·other
612 terms).</p><p>For·each·pair·<code·class="inline">{Property,·Expansion}</code>·in·<code·class="inline">Expansions</code>:·if·<code·class="inline">E</code>·is·the612 terms).</p><p>For·each·pair·<code·class="inline">{Property,·Expansion}</code>·in·<code·class="inline">Expansions</code>:·if·<code·class="inline">E</code>·is·the
613 first·entry·in·<code·class="inline">ListIn</code>·with·the·same·key·as·<code·class="inline">Property</code>,·and·<code·class="inline">E</code>·and·<code·class="inline">Property</code>613 first·entry·in·<code·class="inline">ListIn</code>·with·the·same·key·as·<code·class="inline">Property</code>,·and·<code·class="inline">E</code>·and·<code·class="inline">Property</code>
614 have·equivalent·normal·forms,·then·<code·class="inline">E</code>·is·replaced·with·the·terms·in614 have·equivalent·normal·forms,·then·<code·class="inline">E</code>·is·replaced·with·the·terms·in
615 <code·class="inline">Expansion</code>,·and·any·following·entries·with·the·same·key·are·deleted·from615 <code·class="inline">Expansion</code>,·and·any·following·entries·with·the·same·key·are·deleted·from
616 <code·class="inline">ListIn</code>.</p><p>For·example,·the·following·expressions·all·return·<code·class="inline">[fie,·bar,·baz,·fum]</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expand</span><span·class="p"·data-group-id="9398013261-1">(</span><span·class="p"·data-group-id="9398013261-2">[</span><span·class="p"·data-group-id="9398013261-3">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9398013261-4">[</span>[·...·truncated·by·diffoscope;·len:·633,·SHA:·48468b7450f3cc4cdfb4bdc277055219bd439a8e52869d905b45bf09b2a4915b·...·]-1">)</span><span·class="w">616 <code·class="inline">ListIn</code>.</p><p>For·example,·the·following·expressions·all·return·<code·class="inline">[fie,·bar,·baz,·fum]</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expand</span><span·class="p"·data-group-id="6006757613-1">(</span><span·class="p"·data-group-id="6006757613-2">[</span><span·class="p"·data-group-id="6006757613-3">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6006757613-4">[</span>[·...·truncated·by·diffoscope;·len:·633,·SHA:·f1987a207668d49615743ff6b2aea3675e8bb677915bc600a0017aa0cd9be7db·...·]-1">)</span><span·class="w">
617 </span><span·class="nf">expand</span><span·class="p"·data-group-id="9398013261-6">(</span><span·class="p"·data-group-id="9398013261-7">[</span><span·class="p"·data-group-id="9398013261-8">{</span><span·class="p"·data-group-id="9398013261-9">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="9398013261-9">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9398013261-10">[</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">baz</span><span·class="p"·data-group-id="9398013261-10">]</span><span·class="p"·data-group-id="9398013261-8">}</span><span·class="p"·data-group-id="9398013261-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9398013261-11">[</span><span·class="ss">fie</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">fum</span><span·class="p"·data-group-id="9398013261-11">]</span><span·class="p"·data-group-id="9398013261-6">)</span><span·class="w"> 
618 </span><span·class="nf">expand</span><span·class="p"·data-group-id="9398013261-12">(</span><span·class="p"·data-group-id="9398013261-13">[</span><span·class="p"·data-group-id="9398013261-14">{</span><span·class="p"·data-group-id="9398013261-15">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="9398013261-15">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9398013261-16">[</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">baz</span><span·class="p"·data-group-id="9398013261-16">]</span><span·class="p"·data-group-id="9398013261-14">}</span><span·class="p"·data-group-id="9398013261-13">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9398013261-17">[</span><span·class="ss">fie</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9398013261-18">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="9398013261-18">}</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">fum</span><span·class="p"·data-group-id="9398013261-17">]</span><span·class="p"·data-group-id="9398013261-12">)</span></code></pre><p>However,·no·expansion·is·done·in·the·following·call·because·<code·class="inline">{foo,·false}</code> 
619 shadows·<code·class="inline">foo</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expand</span><span·class="p"·data-group-id="0404434072-1">(</span><span·class="p"·data-group-id="0404434072-2">[</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·1333,·SHA:·5db3ea5715024c3a3cf35953b02ece7fa9f0ebae3226de6cf5d61da660916a28·...·]617 </span><span·class="nf">expand</span><span·class="p"·data-group-id="6006757613-6">(</span><span·class="p"·data-group-id="6006757613-7">[</span><span·class="p"·data-group-id="6006757613-8">{</span><span·class="p"·data-group-id="6006757613-9">{</span><span·c[·...·truncated·by·diffoscope;·len:·915,·SHA:·910279a952a753cbad3e04269a40cebff232144fe3833fe15bb630e8ada77b6a·...·]
 618 </span><span·class="nf">expand</span><span·class="p"·data-group-id="6006757613-12">(</span><span·class="p"·data-group-id="6006757613-13">[</span><span·class="p"·data-group-id="6006757613-14">{</span><span·class="p"·data-group-id="6006757613-15">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6006757613-15">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6006757613-16">[</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">baz</span><span·class="p"·data-group-id="6006757613-16">]</span><span·class="p"·data-group-id="6006757613-14">}</span><span·class="p"·data-group-id="6006757613-13">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6006757613-17">[</span><span·class="ss">fie</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6006757613-18">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6006757613-18">}</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">fum</span><span·class="p"·data-group-id="6006757613-17">]</span><span·class="p"·data-group-id="6006757613-12">)</span></code></pre><p>However,·no·expansion·is·done·in·the·following·call·because·<code·class="inline">{foo,·false}</code>
 619 shadows·<code·class="inline">foo</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">expand</span><span·class="p"·data-group-id="7967532899-1">(</span><span·class="p"·data-group-id="7967532899-2">[</span><span·class="p"·data-group-id="7967532899-3">{</span><span·class="p"·data-group-id="7967532899-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="7967532899-4">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7967532899-5">[</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">baz</span><span·class="p"·data-group-id="7967532899-5">]</span><span·class="p"·data-group-id="7967532899-3">}</span><span·class="p"·data-group-id="7967532899-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7967532899-6">[</span><span·class="p"·data-group-id="7967532899-7">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="7967532899-7">}</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">fie</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">fum</span><span·class="p"·data-group-id="7967532899-6">]</span><span·class="p"·data-group-id="7967532899-1">)</span></code></pre><p>Notice·that·if·the·original·property·term·is·to·be·preserved·in·the·result·when
620 expanded,·it·must·be·included·in·the·expansion·list.·The·inserted·terms·are·not620 expanded,·it·must·be·included·in·the·expansion·list.·The·inserted·terms·are·not
621 expanded·recursively.·If·<code·class="inline">Expansions</code>·contains·more·than·one·property·with·the621 expanded·recursively.·If·<code·class="inline">Expansions</code>·contains·more·than·one·property·with·the
622 same·key,·only·the·first·occurrence·is·used.</p><p>See·also·<a·href="#normalize/2"><code·class="inline">normalize/2</code></a>.</p>622 same·key,·only·the·first·occurrence·is·used.</p><p>See·also·<a·href="#normalize/2"><code·class="inline">normalize/2</code></a>.</p>
623 ··</section>623 ··</section>
624 </section>624 </section>
625 <section·class="detail"·id="from_map/1">625 <section·class="detail"·id="from_map/1">
  
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992 ···············when·List·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],·Keys·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],·Lists·::·[[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()]],·Rest·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>992 ···············when·List·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],·Keys·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()],·Lists·::·[[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()]],·Rest·::·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>()].</pre>
  
993 ······</div>993 ······</div>
  
994 <p>Partitions·<code·class="inline">List</code>·into·a·list·of·sublists·and·a·remainder.</p><p><code·class="inline">Lists</code>·contains·one·sublist·for·each·key·in·<code·class="inline">Keys</code>,·in·the·corresponding·order.994 <p>Partitions·<code·class="inline">List</code>·into·a·list·of·sublists·and·a·remainder.</p><p><code·class="inline">Lists</code>·contains·one·sublist·for·each·key·in·<code·class="inline">Keys</code>,·in·the·corresponding·order.
995 The·relative·order·of·the·elements·in·each·sublist·is·preserved·from·the·original·<code·class="inline">List</code>.995 The·relative·order·of·the·elements·in·each·sublist·is·preserved·from·the·original·<code·class="inline">List</code>.
996 <code·class="inline">Rest</code>·contains·the·elements·in·<code·class="inline">List</code>·that·are·not·associated·with·any·of·the996 <code·class="inline">Rest</code>·contains·the·elements·in·<code·class="inline">List</code>·that·are·not·associated·with·any·of·the
997 specified·keys,·also·with·their·original·relative·order·preserved.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">split</span><span·class="p"·data-group-id="5530937001-1">(</span><span·class="p"·data-group-id="5530937001-2">[</span><span·class="p"·data-group-id="5530937001-3">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·3432,·SHA:·1fce002a7af652c40b6e60ced0e569119f5a9dfbb18b7988c95dcbf5d72f52db·...·]-1">}</span></code></pre>997 specified·keys,·also·with·their·original·relative·order·preserved.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">split</span><span·class="p"·data-group-id="9884678427-1">(</span><span·class="p"·data-group-id="9884678427-2">[</span><span·class="p"·data-group-id="9884678427-3">{</span><span·class="ss">c</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·3432,·SHA:·ab1798729624f313941831fc11fbbf93bad62b295366c083ce1adef16b46b7f3·...·]-1">}</span></code></pre>
998 ··</section>998 ··</section>
999 </section>999 </section>
1000 <section·class="detail"·id="substitute_aliases/2">1000 <section·class="detail"·id="substitute_aliases/2">
  
1001 ··<div·class="detail-header">1001 ··<div·class="detail-header">
1002 ····<a·href="#substitute_aliases/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1002 ····<a·href="#substitute_aliases/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1003 ······<i·class="ri-link-m"·aria-hidden="true"></i>1003 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1109 ······</div>1109 ······</div>
  
1110 <p>Converts·the·property·list·<code·class="inline">List</code>·to·a·map.</p><p>Shorthand·atom·values·in·<code·class="inline">List</code>·will·be·expanded·to·an·association·of·the·form1110 <p>Converts·the·property·list·<code·class="inline">List</code>·to·a·map.</p><p>Shorthand·atom·values·in·<code·class="inline">List</code>·will·be·expanded·to·an·association·of·the·form
1111 <code·class="inline">Atom·=&gt;·true</code>.·Tuples·of·the·form·<code·class="inline">{Key,·Value}</code>·in·<code·class="inline">List</code>·will·be·converted·to1111 <code·class="inline">Atom·=&gt;·true</code>.·Tuples·of·the·form·<code·class="inline">{Key,·Value}</code>·in·<code·class="inline">List</code>·will·be·converted·to
1112 an·association·of·the·form·<code·class="inline">Key·=&gt;·Value</code>.·Anything·else·will·be·silently1112 an·association·of·the·form·<code·class="inline">Key·=&gt;·Value</code>.·Anything·else·will·be·silently
1113 ignored.</p><p>If·the·same·key·appears·in·<code·class="inline">List</code>·multiple·times,·the·value·of·the·one·appearing1113 ignored.</p><p>If·the·same·key·appears·in·<code·class="inline">List</code>·multiple·times,·the·value·of·the·one·appearing
1114 nearest·to·the·head·of·<code·class="inline">List</code>·will·be·in·the·result·map,·that·is·the·value·that1114 nearest·to·the·head·of·<code·class="inline">List</code>·will·be·in·the·result·map,·that·is·the·value·that
1115 would·be·returned·by·a·call·to·<a·href="#get_value/2"><code·class="inline">get_value(Key,·List)</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">to_map</span><span·class="p"·data-group-id="9245764680-1">(</span><span·class="p"·data-group-id="9245764680-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9245764680-3">{</span><span·class="ss">b</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·1354,·SHA:·a66906ee724c894075470ae286ae682d3317f0e3dd1b067e50c69a6a9720c78a·...·]-1">}</span></code></pre>1115 would·be·returned·by·a·call·to·<a·href="#get_value/2"><code·class="inline">get_value(Key,·List)</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">to_map</span><span·class="p"·data-group-id="7165616457-1">(</span><span·class="p"·data-group-id="7165616457-2">[</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7165616457-3">{</span><span·class="ss">b</span><span·class="p">,</span><span·[·...·truncated·by·diffoscope;·len:·1354,·SHA:·bcfd99d1a6591c130a027a02a3af8ad7591f8dc60cd16542961003b88d9987e3·...·]-1">}</span></code></pre>
1116 ··</section>1116 ··</section>
1117 </section>1117 </section>
1118 <section·class="detail"·id="to_map/2">1118 <section·class="detail"·id="to_map/2">
  
1119 ··<div·class="detail-header">1119 ··<div·class="detail-header">
1120 ····<a·href="#to_map/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1120 ····<a·href="#to_map/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1121 ······<i·class="ri-link-m"·aria-hidden="true"></i>1121 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1201 ······<p·class="built-using">1201 ······<p·class="built-using">
1202 ········Built·using1202 ········Built·using
1203 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1203 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1204 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1204 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1205 ······</p>1205 ······</p>
1206 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1206 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1207 ····</footer>1207 ····</footer>
1208 ··</div>1208 ··</div>
1209 </main>1209 </main>
1210 </div>1210 </div>
1211 <script>1211 <script>
1212 ··function·mermaidLoaded()·{1212 ··function·mermaidLoaded()·{
1213 ····mermaid.initialize({1213 ····mermaid.initialize({
722 B
html2text {}
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713 ······<div·class="specs">713 ······<div·class="specs">
  
714 ··········<pre·translate="no"><span·class="attribute">-spec</span>·all(Pred,·Q·::·<a·href="#t:queue/1">queue</a>(Item))·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()·when·Pred·::·fun((Item)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()).</pre>714 ··········<pre·translate="no"><span·class="attribute">-spec</span>·all(Pred,·Q·::·<a·href="#t:queue/1">queue</a>(Item))·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()·when·Pred·::·fun((Item)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()).</pre>
  
715 ······</div>715 ······</div>
  
716 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">Pred(Item)</code>·returns·<code·class="inline">true</code>·for·all·items·<code·class="inline">Item</code>·in·<code·class="inline">Q</code>,716 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">Pred(Item)</code>·returns·<code·class="inline">true</code>·for·all·items·<code·class="inline">Item</code>·in·<code·class="inline">Q</code>,
717 otherwise·<code·class="inline">false</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="1033305562-1">(</span><span·class="p"·data-group-id="1033305562-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·8a1af408b31d37b1ebd2c5b066b009dae5ef2b97441204683b7c6033161a4c1c·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">717 otherwise·<code·class="inline">false</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="3904872876-1">(</span><span·class="p"·data-group-id="3904872876-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·44c21510b33b92380ac20abd339a8a747aa7e80989608f661fe53913e4f56147·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
718 2&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">all</span><span·class="p"·data-group-id="1033305562-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1033305562-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="1033305562-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·6ef96f094fc82fce3dca4bc30ff3275339309ed82fde4c0de2d1ccf05e827b61·...·]-3">)</span><span·class="p">.</span><span·class="w">718 2&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">all</span><span·class="p"·data-group-id="3904872876-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="3904872876-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="3904872876-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·b7b961bc188747fc0f707c1d013854a7b6fd09acd695c580765bd5a014bdf017·...·]-3">)</span><span·class="p">.</span><span·class="w">
719 </span><span·class="ss">false</span><span·class="gp·unselectable">719 </span><span·class="ss">false</span><span·class="gp·unselectable">
720 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">all</span><span·class="p"·data-group-id="1033305562-5">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1033305562-6">(</span><span·class="n">E</span><span·class="p"·data-group-id="1033305562-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·9cb0db423682e409fc16195c7aaca17c07b1565993cf94ca5a79921e179df8c9·...·]-5">)</span><span·class="p">.</span><span·class="w">720 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">all</span><span·class="p"·data-group-id="3904872876-5">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="3904872876-6">(</span><span·class="n">E</span><span·class="p"·data-group-id="3904872876-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·25670e6c990871365f672b1ebebab7890c8ac52a19993df1bf680a895048cb8a·...·]-5">)</span><span·class="p">.</span><span·class="w">
721 </span><span·class="ss">true</span></code></pre>721 </span><span·class="ss">true</span></code></pre>
722 ··</section>722 ··</section>
723 </section>723 </section>
724 <section·class="detail"·id="any/2">724 <section·class="detail"·id="any/2">
  
725 ··<div·class="detail-header">725 ··<div·class="detail-header">
726 ····<a·href="#any/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">726 ····<a·href="#any/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 746, 18 lines modifiedOffset 746, 18 lines modified
746 ······<div·class="specs">746 ······<div·class="specs">
  
747 ··········<pre·translate="no"><span·class="attribute">-spec</span>·any(Pred,·Q·::·<a·href="#t:queue/1">queue</a>(Item))·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()·when·Pred·::·fun((Item)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()).</pre>747 ··········<pre·translate="no"><span·class="attribute">-spec</span>·any(Pred,·Q·::·<a·href="#t:queue/1">queue</a>(Item))·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()·when·Pred·::·fun((Item)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()).</pre>
  
748 ······</div>748 ······</div>
  
749 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">Pred(Item)</code>·returns·<code·class="inline">true</code>·for·at·least·one·item·<code·class="inline">Item</code>·in749 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">Pred(Item)</code>·returns·<code·class="inline">true</code>·for·at·least·one·item·<code·class="inline">Item</code>·in
750 <code·class="inline">Q</code>,·otherwise·<code·class="inline">false</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="5556266840-1">(</span><span·class="p"·data-group-id="5556266840-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·cf1be8797d7f2c9c530cf8fa2af3f22ae44a71896d8e64de54ed31baf4cda192·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">750 <code·class="inline">Q</code>,·otherwise·<code·class="inline">false</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="4116901902-1">(</span><span·class="p"·data-group-id="4116901902-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·ed35a78b47ac20073c526d099910b70fe3875af5206abfffede9026ef4a9bcad·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
751 2&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">any</span><span·class="p"·data-group-id="5556266840-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5556266840-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="5556266840-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·315,·SHA:·47b8c65717b0c38dc8c5148479f6d036fc0c6d8c2ee336ca7d50a50ee3f3d749·...·]-3">)</span><span·class="p">.</span><span·class="w">751 2&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">any</span><span·class="p"·data-group-id="4116901902-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="4116901902-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="4116901902-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·315,·SHA:·fd1ff5582d382602ed418741154d4ff8c588004b61b8cff485e57b2d3ca7bc01·...·]-3">)</span><span·class="p">.</span><span·class="w">
752 </span><span·class="ss">false</span><span·class="gp·unselectable">752 </span><span·class="ss">false</span><span·class="gp·unselectable">
753 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">any</span><span·class="p"·data-group-id="5556266840-5">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5556266840-6">(</span><span·class="n">E</span><span·class="p"·data-group-id="5556266840-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·9038d2e4a34d4ac3bff93f56c07e977345c5d68db5b5e2507d231e0543c59b5f·...·]-5">)</span><span·class="p">.</span><span·class="w">753 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">any</span><span·class="p"·data-group-id="4116901902-5">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="4116901902-6">(</span><span·class="n">E</span><span·class="p"·data-group-id="4116901902-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·78628fae163ee276f128d06239c682bb0ac961ac2de6298b9d6567b84d10928d·...·]-5">)</span><span·class="p">.</span><span·class="w">
754 </span><span·class="ss">true</span></code></pre>754 </span><span·class="ss">true</span></code></pre>
755 ··</section>755 ··</section>
756 </section>756 </section>
757 <section·class="detail"·id="delete/2">757 <section·class="detail"·id="delete/2">
  
758 ··<div·class="detail-header">758 ··<div·class="detail-header">
759 ····<a·href="#delete/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">759 ····<a·href="#delete/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 779, 17 lines modifiedOffset 779, 17 lines modified
779 ······<div·class="specs">779 ······<div·class="specs">
  
780 ··········<pre·translate="no"><span·class="attribute">-spec</span>·delete(Item,·Q1)·->·Q2·when·Item·::·T,·Q1·::·<a·href="#t:queue/1">queue</a>(T),·Q2·::·<a·href="#t:queue/1">queue</a>(T),·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>780 ··········<pre·translate="no"><span·class="attribute">-spec</span>·delete(Item,·Q1)·->·Q2·when·Item·::·T,·Q1·::·<a·href="#t:queue/1">queue</a>(T),·Q2·::·<a·href="#t:queue/1">queue</a>(T),·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
781 ······</div>781 ······</div>
  
782 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·first·item·matching·<code·class="inline">Item</code>·is·deleted,·if·there782 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·first·item·matching·<code·class="inline">Item</code>·is·deleted,·if·there
783 is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="7389909857-1">(</span><span·class="p"·data-group-id="7389909857-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·21714195f831464371ec3f01d77060ad5d8cd26830ab080752f6de4e0f98b4fa·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">783 is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="9925922809-1">(</span><span·class="p"·data-group-id="9925922809-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·a58516c657eb6f148ad89956c9b7b31ac195d93fdac5f567f25b106622b281e3·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
784 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="7389909857-3">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Queue</span><span·class="p"·data-group-id="7389909857-3">)</span><span·class="p">.</span><span·class="gp·unselectable">784 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete</span><span·class="p"·data-group-id="9925922809-3">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Queue</span><span·class="p"·data-group-id="9925922809-3">)</span><span·class="p">.</span><span·class="gp·unselectable">
785 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="7389909857-4">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Queue1</span><span·class="p"·data-group-id="7389909857-4">)</span><span·class="p">.</span><span·class="w">785 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">member</span><span·class="p"·data-group-id="9925922809-4">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Queue1</span><span·class="p"·data-group-id="9925922809-4">)</span><span·class="p">.</span><span·class="w">
786 </span><span·class="ss">false</span></code></pre>786 </span><span·class="ss">false</span></code></pre>
787 ··</section>787 ··</section>
788 </section>788 </section>
789 <section·class="detail"·id="delete_r/2">789 <section·class="detail"·id="delete_r/2">
  
790 ··<div·class="detail-header">790 ··<div·class="detail-header">
791 ····<a·href="#delete_r/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">791 ····<a·href="#delete_r/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 811, 18 lines modifiedOffset 811, 18 lines modified
811 ······<div·class="specs">811 ······<div·class="specs">
  
812 ··········<pre·translate="no"><span·class="attribute">-spec</span>·delete_r(Item,·Q1)·->·Q2·when·Item·::·T,·Q1·::·<a·href="#t:queue/1">queue</a>(T),·Q2·::·<a·href="#t:queue/1">queue</a>(T),·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>812 ··········<pre·translate="no"><span·class="attribute">-spec</span>·delete_r(Item,·Q1)·->·Q2·when·Item·::·T,·Q1·::·<a·href="#t:queue/1">queue</a>(T),·Q2·::·<a·href="#t:queue/1">queue</a>(T),·T·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
813 ······</div>813 ······</div>
  
814 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·last·item·matching·<code·class="inline">Item</code>·is·deleted,·if·there814 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·last·item·matching·<code·class="inline">Item</code>·is·deleted,·if·there
815 is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="1412053758-1">(</span><span·class="p"·data-group-id="1412053758-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·clas[·...·truncated·by·diffoscope;·len:·182,·SHA:·6c6841b4abb67fb300d8fdc318fe74390dfe8d81482d5abcad8afc95f42dc2ee·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">815 is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="1109355459-1">(</span><span·class="p"·data-group-id="1109355459-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·clas[·...·truncated·by·diffoscope;·len:·182,·SHA:·e725afc9f64fc58afadff84215af6d7cdc7a6b2d0ea3b9541319b5a7ec7cf1d8·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
816 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete_r</span><span·class="p"·data-group-id="1412053758-3">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Queue</span><span·class="p"·data-group-id="1412053758-3">)</span><span·class="p">.</span><span·class="gp·unselectable">816 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete_r</span><span·class="p"·data-group-id="1109355459-3">(</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Queue</span><span·class="p"·data-group-id="1109355459-3">)</span><span·class="p">.</span><span·class="gp·unselectable">
817 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="1412053758-4">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="1412053758-4">)</span><span·class="p">.</span><span·class="w">817 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="1109355459-4">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="1109355459-4">)</span><span·class="p">.</span><span·class="w">
818 </span><span·class="p"·data-group-id="1412053758-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·1d11efb21a80f04ce8d4900e12ff78c4a73abfde558bb0d5ed9361123525d2c8·...·]-5">]</span></code></pre>818 </span><span·class="p"·data-group-id="1109355459-5">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·7913d23206c5d7bbdd6edc67cf39af10925b128b3ebed35c43d20fee052429ba·...·]-5">]</span></code></pre>
819 ··</section>819 ··</section>
820 </section>820 </section>
821 <section·class="detail"·id="delete_with/2">821 <section·class="detail"·id="delete_with/2">
  
822 ··<div·class="detail-header">822 ··<div·class="detail-header">
823 ····<a·href="#delete_with/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">823 ····<a·href="#delete_with/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
824 ······<i·class="ri-link-m"·aria-hidden="true"></i>824 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 848, 18 lines modifiedOffset 848, 18 lines modified
848 ·························Q1·::·<a·href="#t:queue/1">queue</a>(Item),848 ·························Q1·::·<a·href="#t:queue/1">queue</a>(Item),
849 ·························Q2·::·<a·href="#t:queue/1">queue</a>(Item),849 ·························Q2·::·<a·href="#t:queue/1">queue</a>(Item),
850 ·························Item·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>850 ·························Item·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
851 ······</div>851 ······</div>
  
852 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·first·item·for·which·<code·class="inline">Pred</code>·returns·<code·class="inline">true</code>·is852 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·first·item·for·which·<code·class="inline">Pred</code>·returns·<code·class="inline">true</code>·is
853 deleted,·if·there·is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="7680163524-1">(</span><span·class="p"·data-group-id="7680163524-2">[</span><span·class="mi">100</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·c[·...·truncated·by·diffoscope;·len:·185,·SHA:·42595e7b30c23dfe13cb2eb5032d871573d3dbf8a899d36e3ff4f0c624f791bb·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">853 deleted,·if·there·is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="0344025495-1">(</span><span·class="p"·data-group-id="0344025495-2">[</span><span·class="mi">100</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·c[·...·truncated·by·diffoscope;·len:·185,·SHA:·afa503b4003f70c120dd695f0f0e97adb6381d12c5578a51bc1992bb82c83131·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
854 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete_with</span><span·class="p"·data-group-id="7680163524-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="7680163524-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="7680163524-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·264,·SHA:·56930fecdf6e2f827e35b7b63ca352f036520ef7a18b3dd4f9e2d43c49e2f671·...·]-3">)</span><span·class="p">.</span><span·class="gp·unselectable">854 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete_with</span><span·class="p"·data-group-id="0344025495-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="0344025495-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="0344025495-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·264,·SHA:·4a156be49cb16ebca076fcee38629895f962f342a40b5256bfbf158a65296775·...·]-3">)</span><span·class="p">.</span><span·class="gp·unselectable">
855 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="7680163524-5">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="7680163524-5">)</span><span·class="p">.</span><span·class="w">855 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="0344025495-5">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="0344025495-5">)</span><span·class="p">.</span><span·class="w">
856 </span><span·class="p"·data-group-id="7680163524-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·f4543bc49f34c0c149c021518e8a3860be421b3b590d673b497ab54244731503·...·]-6">]</span></code></pre>856 </span><span·class="p"·data-group-id="0344025495-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="[·...·truncated·by·diffoscope;·len:·28,·SHA:·d27d88d77c40bf277ee64a40bddc92c4026eb9f20a95b232da44e1c61f331d18·...·]-6">]</span></code></pre>
857 ··</section>857 ··</section>
858 </section>858 </section>
859 <section·class="detail"·id="delete_with_r/2">859 <section·class="detail"·id="delete_with_r/2">
  
860 ··<div·class="detail-header">860 ··<div·class="detail-header">
861 ····<a·href="#delete_with_r/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">861 ····<a·href="#delete_with_r/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
862 ······<i·class="ri-link-m"·aria-hidden="true"></i>862 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 885, 18 lines modifiedOffset 885, 18 lines modified
885 ···························Q1·::·<a·href="#t:queue/1">queue</a>(Item),885 ···························Q1·::·<a·href="#t:queue/1">queue</a>(Item),
886 ···························Q2·::·<a·href="#t:queue/1">queue</a>(Item),886 ···························Q2·::·<a·href="#t:queue/1">queue</a>(Item),
887 ···························Item·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>887 ···························Item·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:term/0">term</a>().</pre>
  
888 ······</div>888 ······</div>
  
889 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·last·item·for·which·<code·class="inline">Pred</code>·returns·<code·class="inline">true</code>·is889 <p>Returns·a·copy·of·<code·class="inline">Q1</code>·where·the·last·item·for·which·<code·class="inline">Pred</code>·returns·<code·class="inline">true</code>·is
890 deleted,·if·there·is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="4429149607-1">(</span><span·class="p"·data-group-id="4429149607-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·clas[·...·truncated·by·diffoscope;·len:·184,·SHA:·11c6221ccf3c409ab8da5e5a08535d969e11dd519c0c4f392afdd6b325cbc110·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">890 deleted,·if·there·is·such·an·item.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="4572395953-1">(</span><span·class="p"·data-group-id="4572395953-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·clas[·...·truncated·by·diffoscope;·len:·184,·SHA:·89924be1b73ff37a503d27b662db647cb1845f7345b5060f39a979c876eaa312·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
891 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete_with</span><span·class="p"·data-group-id="4429149607-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="4429149607-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="4429149607-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><s[·...·truncated·by·diffoscope;·len:·264,·SHA:·55c196447c860892a768e6e56ee0be44361ccd167135e28a7aa75b61f8aa6052·...·]-3">)</span><span·class="p">.</span><span·class="gp·unselectable">891 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">delete_with</span><span·class="p"·data-group-id="4572395953-3">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="4572395953-4">(</span><span·class="n">E</span><span·class="p"·data-group-id="4572395953-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><s[·...·truncated·by·diffoscope;·len:·264,·SHA:·f9035b9a85d43e69bb927bf4ecfef518d1beec12680b812f2048b266f3abf9aa·...·]-3">)</span><span·class="p">.</span><span·class="gp·unselectable">
892 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="4429149607-5">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="4429149607-5">)</span><span·class="p">.</span><span·class="w">892 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="4572395953-5">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="4572395953-5">)</span><span·class="p">.</span><span·class="w">
893 </span><span·class="p"·data-group-id="4429149607-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·cdc0c308ee91ebcfaa9ce37a9ccac8e4df8f032d42dcbd453b714a1370d30773·...·]-6">]</span></code></pre>893 </span><span·class="p"·data-group-id="4572395953-6">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·38788424b974de7cdbdb0d37c566975b265c04022c6e96787d18abfd6d7291a8·...·]-6">]</span></code></pre>
894 ··</section>894 ··</section>
895 </section>895 </section>
896 <section·class="detail"·id="filter/2">896 <section·class="detail"·id="filter/2">
  
897 ··<div·class="detail-header">897 ··<div·class="detail-header">
898 ····<a·href="#filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">898 ····<a·href="#filter/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
899 ······<i·class="ri-link-m"·aria-hidden="true"></i>899 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 917, 27 lines modifiedOffset 917, 27 lines modified
917 ··········<pre·translate="no"><span·class="attribute">-spec</span>·filter(Fun,·Q1·::·<a·href="#t:queue/1">queue</a>(Item))·->·Q2·::·<a·href="#t:queue/1">queue</a>(Item)·when·Fun·::·fun((Item)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()·|·[Item]).</pre>917 ··········<pre·translate="no"><span·class="attribute">-spec</span>·filter(Fun,·Q1·::·<a·href="#t:queue/1">queue</a>(Item))·->·Q2·::·<a·href="#t:queue/1">queue</a>(Item)·when·Fun·::·fun((Item)·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>()·|·[Item]).</pre>
  
918 ······</div>918 ······</div>
  
919 <p>Returns·a·queue·<code·class="inline">Q2</code>·that·is·the·result·of·calling·<code·class="inline">Fun(Item)</code>·on·all·items·in919 <p>Returns·a·queue·<code·class="inline">Q2</code>·that·is·the·result·of·calling·<code·class="inline">Fun(Item)</code>·on·all·items·in
920 <code·class="inline">Q1</code>.</p><p>If·<code·class="inline">Fun(Item)</code>·returns·<code·class="inline">true</code>,·<code·class="inline">Item</code>·is·copied·to·the·result·queue.·If·it920 <code·class="inline">Q1</code>.</p><p>If·<code·class="inline">Fun(Item)</code>·returns·<code·class="inline">true</code>,·<code·class="inline">Item</code>·is·copied·to·the·result·queue.·If·it
921 returns·<code·class="inline">false</code>,·<code·class="inline">Item</code>·is·not·copied.·If·it·returns·a·list,·the·list·elements921 returns·<code·class="inline">false</code>,·<code·class="inline">Item</code>·is·not·copied.·If·it·returns·a·list,·the·list·elements
922 are·inserted·instead·of·<code·class="inline">Item</code>·in·the·result·queue.</p><p><em>Example·1:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="3265459518-1">(</span><span·class="p"·data-group-id="3265459518-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·7682a7722d2691e955607194e70a4c82647b219403c1d8de03f4d698e3b75acc·...·]-1">)</span><span·class="p">.</span><span·class="w">922 are·inserted·instead·of·<code·class="inline">Item</code>·in·the·result·queue.</p><p><em>Example·1:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Queue</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="2170477341-1">(</span><span·class="p"·data-group-id="2170477341-2">[</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·cla[·...·truncated·by·diffoscope;·len:·134,·SHA:·cd726460a9e5d0eec24729348875e41d9380cfdfa74899a918a960e6ee2293b1·...·]-1">)</span><span·class="p">.</span><span·class="w">
923 </span><span·class="p"·data-group-id="3265459518-3">{</span><span·class="p"·data-group-id="3265459518-4">[</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="3265459518-4">]</span><span[·...·truncated·by·diffoscope;·len:·240,·SHA:·5a2e6de5ad930908ed31e022028a10cff6e4be23189f984b63b382ce0355ccdf·...·]-3">}</span><span·class="gp·unselectable">923 </span><span·class="p"·data-group-id="2170477341-3">{</span><span·class="p"·data-group-id="2170477341-4">[</span><span·class="mi">5</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="2170477341-4">]</span><span[·...·truncated·by·diffoscope;·len:·240,·SHA:·34753044d349a3b203a16a17002af92ac07f57c89c34910649f4d4357a4e4689·...·]-3">}</span><span·class="gp·unselectable">
924 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">filter</span><span·class="p"·data-group-id="3265459518-6">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="3265459518-7">(</span><span·class="n">E</span><span·class="p"·data-group-id="3265459518-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·c0fe2b4406a769d5285ebf709ca4227da9c2722b56e28f3e474df65bd7418dde·...·]-6">)</span><span·class="p">.</span><span·class="w">924 2&gt;·</span><span·class="n">Queue1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">filter</span><span·class="p"·data-group-id="2170477341-6">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="2170477341-7">(</span><span·class="n">E</span><span·class="p"·data-group-id="2170477341-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·314,·SHA:·17e66673c2f51d7957bf437b12b4a3a24a5c0fb0842f7e154ffbc3e4994b57c2·...·]-6">)</span><span·class="p">.</span><span·class="w">
925 </span><span·class="p"·data-group-id="3265459518-8">{</span><span·class="p"·data-group-id="3265459518-9">[</span><span·class="mi">5</span><span·class="p"·data-group-id="3265459518-9">]</span><span·class="p">,</span><span·class="p"·data-group-id="3265459518-10">[</span><span·class="mi">3</span>[·...·truncated·by·diffoscope;·len:·144,·SHA:·b43793303d0250f24bc3f04faa823c145b87e293bd7993edf184e799c3717180·...·]-8">}</span><span·class="gp·unselectable">925 </span><span·class="p"·data-group-id="2170477341-8">{</span><span·class="p"·data-group-id="2170477341-9">[</span><span·class="mi">5</span><span·class="p"·data-group-id="2170477341-9">]</span><span·class="p">,</span><span·class="p"·data-group-id="2170477341-10">[</span><span·class="mi">3</span>[·...·truncated·by·diffoscope;·len:·144,·SHA:·b85822418ab05df8bb64a993abcce61a44f16400103e421dd24e2c76ca391df5·...·]-8">}</span><span·class="gp·unselectable">
926 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="3265459518-11">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="3265459518-11">)</span><span·class="p">.</span><span·class="w">926 3&gt;·</span><span·class="nc">queue</span><span·class="p">:</span><span·class="nf">to_list</span><span·class="p"·data-group-id="2170477341-11">(</span><span·class="n">Queue1</span><span·class="p"·data-group-id="2170477341-11">)</span><span·class="p">.</span><span·class="w">
927 </span><span·class="p"·data-group-id="3265459518-12">[</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="3265459518-12">]</span></code></pre><p>So,·<code·class="inline">Fun(Item)</code>·returning·<code·class="inline">[Item]</code>·is·thereby·semantically·equivalent·to927 </span><span·class="p"·data-group-id="2170477341-12">[</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="2170477341-12">]</span></code></pre><p>So,·<code·class="inline">Fun(Item)</code>·returning·<code·class="inline">[Item]</code>·is·thereby·semantically·equivalent·to
928 returning·<code·class="inline">true</code>,·just·as·returning·<code·class="inline">[]</code>·is·semantically·equivalent·to·returning928 returning·<code·class="inline">true</code>,·just·as·returning·<code·class="inline">[]</code>·is·semantically·equivalent·to·returning
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197 or·be·an·explicit·argument·and·return·value.</p><p>The·functions·with·implicit·state·operates·on·a·state·stored197 or·be·an·explicit·argument·and·return·value.</p><p>The·functions·with·implicit·state·operates·on·a·state·stored
198 in·the·process·dictionary·under·the·key·<code·class="inline">rand_seed</code>.··If·that·key198 in·the·process·dictionary·under·the·key·<code·class="inline">rand_seed</code>.··If·that·key
199 doesn't·exist·when·the·function·is·called,·<a·href="#seed/1"><code·class="inline">seed/1</code></a>·is·called·automatically199 doesn't·exist·when·the·function·is·called,·<a·href="#seed/1"><code·class="inline">seed/1</code></a>·is·called·automatically
200 with·the·<a·href="#default-algorithm"><em>default·algorithm</em></a>·and·creates200 with·the·<a·href="#default-algorithm"><em>default·algorithm</em></a>·and·creates
201 a·reasonably·unpredictable·seed.</p><p>The·functions·with·explicit·state·don't·use·the·process·dictionary.</p><h4><em>Examples</em></h4><p>Simple·use;·create·and·seed·the201 a·reasonably·unpredictable·seed.</p><p>The·functions·with·explicit·state·don't·use·the·process·dictionary.</p><h4><em>Examples</em></h4><p>Simple·use;·create·and·seed·the
202 <a·href="#default-algorithm"><em>default·algorithm</em></a>·with·a·non-fixed·seed,202 <a·href="#default-algorithm"><em>default·algorithm</em></a>·with·a·non-fixed·seed,
203 if·not·already·done,·and·generate·two·uniformly·distibuted203 if·not·already·done,·and·generate·two·uniformly·distibuted
204 floating·point·numbers.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">R0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="4679984654-1">(</span><span·class="p"·data-group-id="4679984654-1">)</span><span·class="p">,</span><span·class="w">204 floating·point·numbers.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">R0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="1461018357-1">(</span><span·class="p"·data-group-id="1461018357-1">)</span><span·class="p">,</span><span·class="w">
205 </span><span·class="n">R1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="4679984654-2">(</span><span·class="p"·data-group-id="4679984654-2">)</span><span·class="p">,</span></code></pre><p>Use·a·specified·algorithm:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o"[·...·truncated·by·diffoscope;·len:·240,·SHA:·27532cac9ea277996e6528faa9921d86f180e6d49131b3f64e723bf5d3c48b3e·...·]-1">)</span><span·class="p">,</span><span·class="w">205 </span><span·class="n">R1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="1461018357-2">(</span><span·class="p"·data-group-id="1461018357-2">)</span><span·class="p">,</span></code></pre><p>Use·a·specified·algorithm:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</span><span·class="o"[·...·truncated·by·diffoscope;·len:·240,·SHA:·34d8967ded92137f84fa8ca8e174e870074503e3b78f3603630ee18a63239bc0·...·]-1">)</span><span·class="p">,</span><span·class="w">
206 </span><span·class="n">R2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="8122781406-2">(</span><span·class="p"·data-group-id="8122781406-2">)</span><span·class="p">,</span></code></pre><p>Use·a·specified·algorithm·with·a·fixed·seed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·595,·SHA:·a762d9888d06dcbd3ec704182872f62724cbbfb37dff6438fe783783ceb1ab68·...·]-1">)</span><span·class="p">,</span><span·class="w">206 </span><span·class="n">R2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="0050426287-2">(</span><span·class="p"·data-group-id="0050426287-2">)</span><span·class="p">,</span></code></pre><p>Use·a·specified·algorithm·with·a·fixed·seed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">_</span><span·class="w">·</sp[·...·truncated·by·diffoscope;·len:·595,·SHA:·466343f62795e7a47c4dc951989de589952b60ee27dc7bad1e90f722c5782e8c·...·]-1">)</span><span·class="p">,</span><span·class="w">
207 </span><span·class="n">R3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="9235360064-3">(</span><span·class="p"·data-group-id="9235360064-3">)</span><span·class="p">,</span></code></pre><p>Use·the·functional·API·with·a·non-fixed·seed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">S0</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·258,·SHA:·3a81e3f4aa8f51cd5d3fb506ca2b87dba0e1211c2db9880c8c7ff5a86a5368a2·...·]-1">)</span><span·class="p">,</span><span·class="w">207 </span><span·class="n">R3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="8817863551-3">(</span><span·class="p"·data-group-id="8817863551-3">)</span><span·class="p">,</span></code></pre><p>Use·the·functional·API·with·a·non-fixed·seed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">S0</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·258,·SHA:·3491b80a8d1cd4fa55892d441ab5cb2d7927bc1b3f8a705126164b9ff6f7793c·...·]-1">)</span><span·class="p">,</span><span·class="w">
208 </span><span·class="p"·data-group-id="2301500153-2">{</span><span·class="n">R4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">S1</span><span·class="p"·data-group-id="2301500153-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·654,·SHA:·8996f8d9decb370e036ffdb904c3e56fcf18ff865ff18090f1ce0d7631a2ef8d·...·]-1">)</span><span·class="p">,</span><span·class="w">208 </span><span·class="p"·data-group-id="4965255580-2">{</span><span·class="n">R4</span><span·class="p">,</span><span·class="w">·</span><span·class="n">S1</span><span·class="p"·data-group-id="4965255580-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·654,·SHA:·c004ccccfa17bc862136806106b6c6ac934de04702ce63d63abd81cb1616d3d1·...·]-1">)</span><span·class="p">,</span><span·class="w">
209 </span><span·class="n">R6</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="7797737359-2">(</span><span·class="p"·data-group-id="7797737359-2">)</span><span·class="p">,</span><span·class="w">209 </span><span·class="n">R6</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="6068126467-2">(</span><span·class="p"·data-group-id="6068126467-2">)</span><span·class="p">,</span><span·class="w">
210 </span><span·class="n">SND0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">math</span><span·class="p">:</span><span·class="nf">sqrt</span><span·class="p"·data-group-id="7797737359-3">(</span><span·class="o">-</span><span·class="mi">2</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nc">math</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="779[·...·truncated·by·diffoscope;·len:·2113,·SHA:·8910b975fbc563b18ddd708c9bf31ff4461d6d529f84fa04066d2406be4c381d·...·]-2">)</span><span·class="p">,</span></code></pre><h4>Quality·of·the·Generated·Numbers</h4><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·builtin·random·number·generator·algorithms·are·not·cryptographically210 </span><span·class="n">SND0</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">math</span><span·class="p">:</span><span·class="nf">sqrt</span><span·class="p"·data-group-id="6068126467-3">(</span><span·class="o">-</span><span·class="mi">2</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="nc">math</span><span·class="p">:</span><span·class="nf">log</span><span·class="p"·data-group-id="606[·...·truncated·by·diffoscope;·len:·2113,·SHA:·790352a8671eacf26c391e66bd957c693d6a5d37b8c8091da6ef2d0cfe0594ef·...·]-2">)</span><span·class="p">,</span></code></pre><h4>Quality·of·the·Generated·Numbers</h4><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>The·builtin·random·number·generator·algorithms·are·not·cryptographically
211 strong.·If·a·cryptographically·strong·random·number·generator·is·needed,211 strong.·If·a·cryptographically·strong·random·number·generator·is·needed,
212 use·something·like·<a·href="../../../../lib/crypto-5.5.3/doc/html/crypto.html#rand_seed/0"><code·class="inline">crypto:rand_seed/0</code></a>.</p></section><p>For·all·these·generators·except·<code·class="inline">exro928ss</code>·and·<code·class="inline">exsss</code>·the·lowest·bit(s)212 use·something·like·<a·href="../../../../lib/crypto-5.5.3/doc/html/crypto.html#rand_seed/0"><code·class="inline">crypto:rand_seed/0</code></a>.</p></section><p>For·all·these·generators·except·<code·class="inline">exro928ss</code>·and·<code·class="inline">exsss</code>·the·lowest·bit(s)
213 have·got·a·slightly·less·random·behaviour·than·all·other·bits.213 have·got·a·slightly·less·random·behaviour·than·all·other·bits.
214 1·bit·for·<code·class="inline">exrop</code>·(and·<code·class="inline">exsp</code>),·and·3·bits·for·<code·class="inline">exs1024s</code>.·See·for·example214 1·bit·for·<code·class="inline">exrop</code>·(and·<code·class="inline">exsp</code>),·and·3·bits·for·<code·class="inline">exs1024s</code>.·See·for·example
215 this·explanation·in·the215 this·explanation·in·the
216 <a·href="http://xoroshiro.di.unimi.it/xoroshiro128plus.c">Xoroshiro128+</a>216 <a·href="http://xoroshiro.di.unimi.it/xoroshiro128plus.c">Xoroshiro128+</a>
217 generator·source·code:</p><blockquote><p>Beside·passing·BigCrush,·this·generator·passes·the·PractRand·test·suite217 generator·source·code:</p><blockquote><p>Beside·passing·BigCrush,·this·generator·passes·the·PractRand·test·suite
218 up·to·(and·included)·16TB,·with·the·exception·of·binary·rank·tests,218 up·to·(and·included)·16TB,·with·the·exception·of·binary·rank·tests,
219 which·fail·due·to·the·lowest·bit·being·an·LFSR;·all·other·bits·pass·all219 which·fail·due·to·the·lowest·bit·being·an·LFSR;·all·other·bits·pass·all
220 tests.·We·suggest·to·use·a·sign·test·to·extract·a·random·Boolean·value.</p></blockquote><p>If·this·is·a·problem;·to·generate·a·boolean·with·these·algorithms,220 tests.·We·suggest·to·use·a·sign·test·to·extract·a·random·Boolean·value.</p></blockquote><p>If·this·is·a·problem;·to·generate·a·boolean·with·these·algorithms,
221 use·something·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7761124290-1">(</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="7761124290-2">(</span><span·class="mi">256</span><span·class="p"·data-group-id="7761124290-2">)</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·2110,·SHA:·664d47d9ec4358fa9a19b53cdbf66051e0a7e234f27db0d806f81860039826b9·...·]-1">)</span></code></pre><p>The·floating·point·generating·functions·in·this·module·waste·the·lowest·bits221 use·something·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4371089563-1">(</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="4371089563-2">(</span><span·class="mi">256</span><span·class="p"·data-group-id="4371089563-2">)</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·2110,·SHA:·ee470582638cd8235bb2d61bd4e63729f6ad9a334ca98990eb634881f405987a·...·]-1">)</span></code></pre><p>The·floating·point·generating·functions·in·this·module·waste·the·lowest·bits
222 when·converting·from·an·integer·so·they·avoid·this·snag.</p><h2·id="module-niche-algorithms"·class="section-heading">222 when·converting·from·an·integer·so·they·avoid·this·snag.</p><h2·id="module-niche-algorithms"·class="section-heading">
223 ··<a·href="#module-niche-algorithms"·class="hover-link">223 ··<a·href="#module-niche-algorithms"·class="hover-link">
224 ····<i·class="ri-link-m"·aria-hidden="true"></i>224 ····<i·class="ri-link-m"·aria-hidden="true"></i>
225 ··</a>225 ··</a>
226 ··<span·class="text"><a·href=""·id="niche-algorithms"></a>·Niche·algorithms</span>226 ··<span·class="text"><a·href=""·id="niche-algorithms"></a>·Niche·algorithms</span>
227 </h2>227 </h2>
228 <p>The·<a·href="#niche-algorithms-api">niche·algorithms·API</a>·contains228 <p>The·<a·href="#niche-algorithms-api">niche·algorithms·API</a>·contains
Offset 1871, 18 lines modifiedOffset 1871, 18 lines modified
  
1871 <p>Generate·a·uniformly·distributed·random·number·<code·class="inline">0.0 =&lt; X &lt; 1.0</code>.</p><p>From·the·specified·<code·class="inline">State</code>,·generates·a·random·number·<code·class="inline">X ::</code> <a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:float/0"><code·class="inline">float/0</code></a>,1871 <p>Generate·a·uniformly·distributed·random·number·<code·class="inline">0.0 =&lt; X &lt; 1.0</code>.</p><p>From·the·specified·<code·class="inline">State</code>,·generates·a·random·number·<code·class="inline">X ::</code> <a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:float/0"><code·class="inline">float/0</code></a>,
1872 uniformly·distributed·in·the·value·range·<code·class="inline">0.0·=&lt;·X·&lt;·1.0</code>.1872 uniformly·distributed·in·the·value·range·<code·class="inline">0.0·=&lt;·X·&lt;·1.0</code>.
1873 Returns·the·number·<code·class="inline">X</code>·and·the·updated·<code·class="inline">NewState</code>.</p><p>The·generated·numbers·are·on·the·form·<code·class="inline">N * 2.0^(-53)</code>,·that·is;1873 Returns·the·number·<code·class="inline">X</code>·and·the·updated·<code·class="inline">NewState</code>.</p><p>The·generated·numbers·are·on·the·form·<code·class="inline">N * 2.0^(-53)</code>,·that·is;
1874 equally·spaced·in·the·interval.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>This·function·may·return·exactly·<code·class="inline">0.0</code>·which·can·be·fatal·for·certain1874 equally·spaced·in·the·interval.</p><section·role="note"·class="admonition·warning"><h4·class="admonition-title·warning">Warning</h4><p>This·function·may·return·exactly·<code·class="inline">0.0</code>·which·can·be·fatal·for·certain
1875 applications.·If·that·is·undesired·you·can·use·<code·class="inline">(1.0 - rand:uniform())</code>1875 applications.·If·that·is·undesired·you·can·use·<code·class="inline">(1.0 - rand:uniform())</code>
1876 to·get·the·interval·<code·class="inline">0.0 &lt; X =&lt; 1.0</code>,·or·instead·use·<a·href="#uniform_real/0"><code·class="inline">uniform_real/0</code></a>.</p><p>If·neither·endpoint·is·desired·you·can·achieve·the·range1876 to·get·the·interval·<code·class="inline">0.0 &lt; X =&lt; 1.0</code>,·or·instead·use·<a·href="#uniform_real/0"><code·class="inline">uniform_real/0</code></a>.</p><p>If·neither·endpoint·is·desired·you·can·achieve·the·range
1877 <code·class="inline">0.0 &lt; X &lt; 1.0</code>·using·test·and·re-try·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_uniform</span><span·class="p"·data-group-id="8881066111-1">(</span><span·class="p"·data-group-id="8881066111-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1877 <code·class="inline">0.0 &lt; X &lt; 1.0</code>·using·test·and·re-try·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">my_uniform</span><span·class="p"·data-group-id="4463818144-1">(</span><span·class="p"·data-group-id="4463818144-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1878 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="8881066111-2">(</span><span·class="p"·data-group-id="8881066111-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">1878 ····</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">uniform</span><span·class="p"·data-group-id="4463818144-2">(</span><span·class="p"·data-group-id="4463818144-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
1879 ········</span><span·class="n">X</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="mf">0.0</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="p">;</span><span·class="w">1879 ········</span><span·class="n">X</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="mf">0.0</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="w">·</span><span·class="n">X</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">X</span><span·class="p">;</span><span·class="w">
1880 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">my_uniform</span><span·class="p"·data-group-id="8881066111-3">(</span><span·class="p"·data-group-id="8881066111-3">)</span><span·class="w">1880 ········</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">my_uniform</span><span·class="p"·data-group-id="4463818144-3">(</span><span·class="p"·data-group-id="4463818144-3">)</span><span·class="w">
1881 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre></section>1881 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre></section>
1882 ··</section>1882 ··</section>
1883 </section>1883 </section>
1884 <section·class="detail"·id="uniform_s/2">1884 <section·class="detail"·id="uniform_s/2">
  
1885 ··<div·class="detail-header">1885 ··<div·class="detail-header">
1886 ····<a·href="#uniform_s/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1886 ····<a·href="#uniform_s/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 2027, 15 lines modifiedOffset 2027, 15 lines modified
2027 a·new·state·<a·href="#t:mwc59_state/0"><code·class="inline">CX1</code></a>,·according·to·a·Multiply·With·Carry2027 a·new·state·<a·href="#t:mwc59_state/0"><code·class="inline">CX1</code></a>,·according·to·a·Multiply·With·Carry
2028 generator,·which·is·an·efficient·implementation·of2028 generator,·which·is·an·efficient·implementation·of
2029 a·Multiplicative·Congruential·Generator·with·a·power·of·2·multiplier2029 a·Multiplicative·Congruential·Generator·with·a·power·of·2·multiplier
2030 and·a·prime·modulus.</p><p>This·generator·uses·the·multiplier·<code·class="inline">2^32</code>·and·the·modulus2030 and·a·prime·modulus.</p><p>This·generator·uses·the·multiplier·<code·class="inline">2^32</code>·and·the·modulus
2031 <code·class="inline">16#7fa6502 * 2^32 - 1</code>,·which·have·been·selected,·in·collaboration·with2031 <code·class="inline">16#7fa6502 * 2^32 - 1</code>,·which·have·been·selected,·in·collaboration·with
2032 Sebastiano·Vigna,·to·avoid·bignum·operations·and·still·get2032 Sebastiano·Vigna,·to·avoid·bignum·operations·and·still·get
2033 good·statistical·quality.·It·has·been·named·&quot;MWC59&quot;·and·can·be·written·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">C</span><span·class="err"> </span><span·class="o">=</span><span·class="err"> </span><span·class="n">CX0</span><span·class="err"> </span><span·class="ow">bsr</span><span·class="err"> </span><span·class="mi">32</span><span·class="w">2033 good·statistical·quality.·It·has·been·named·&quot;MWC59&quot;·and·can·be·written·as:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">C</span><span·class="err"> </span><span·class="o">=</span><span·class="err"> </span><span·class="n">CX0</span><span·class="err"> </span><span·class="ow">bsr</span><span·class="err"> </span><span·class="mi">32</span><span·class="w">
2034 </span><span·class="n">X</span><span·class="err"> </span><span·class="o">=</span><span·class="err"> </span><span·class="n">CX0</span><span·class="err"> </span><span·class="ow">band</span><span·class="err"> </span><span·class="p"·data-group-id="0211103900-1">(</span><span·class="p"·data-group-id="0211103900-2">(</span><span·class="mi">1</span><span·class="err"> </span><span·class="ow">bsl</span><span·class="err"> </span><span·class="mi">32</span><span·class="p"·data-group-id="0211103900-2">)</spa[·...·truncated·by·diffoscope;·len:·91,·SHA:·6e7a1f594c46609c3e94ce75ae431618a96d75606b5217f6824188997249caa8·...·]0-1">)</span><span·class="p">)</span><span·class="w">2034 </span><span·class="n">X</span><span·class="err"> </span><span·class="o">=</span><span·class="err"> </span><span·class="n">CX0</span><span·class="err"> </span><span·class="ow">band</span><span·class="err"> </span><span·class="p"·data-group-id="1734388230-1">(</span><span·class="p"·data-group-id="1734388230-2">(</span><span·class="mi">1</span><span·class="err"> </span><span·class="ow">bsl</span><span·class="err"> </span><span·class="mi">32</span><span·class="p"·data-group-id="1734388230-2">)</spa[·...·truncated·by·diffoscope;·len:·91,·SHA:·3ad6d6122ffd6b16a3314c3147fd060c0dce9815e1d04f2b973ecac1cdaf5a9a·...·]0-1">)</span><span·class="p">)</span><span·class="w">
2035 </span><span·class="n">CX1</span><span·class="err"> </span><span·class="o">=</span><span·class="err"> </span><span·class="mi">16#7fa6502</span><span·class="err"> </span><span·class="o">*</span><span·class="err"> </span><span·class="n">X</span><span·class="err"> </span><span·class="o">+</span><span·class="err"> </span><span·class="n">C</span></code></pre><p>Because·the·generator·uses·a·multiplier·that·is·a·power·of·2·it·gets2035 </span><span·class="n">CX1</span><span·class="err"> </span><span·class="o">=</span><span·class="err"> </span><span·class="mi">16#7fa6502</span><span·class="err"> </span><span·class="o">*</span><span·class="err"> </span><span·class="n">X</span><span·class="err"> </span><span·class="o">+</span><span·class="err"> </span><span·class="n">C</span></code></pre><p>Because·the·generator·uses·a·multiplier·that·is·a·power·of·2·it·gets
2036 statistical·flaws·for·collision·tests·and·birthday·spacings·tests2036 statistical·flaws·for·collision·tests·and·birthday·spacings·tests
2037 in·2·and·3·dimensions,·and·these·caveats·apply·even·when·looking2037 in·2·and·3·dimensions,·and·these·caveats·apply·even·when·looking
2038 only·at·the·MWC·&quot;digit&quot;,·that·is·the·low·32·bits·(the·multiplier)2038 only·at·the·MWC·&quot;digit&quot;,·that·is·the·low·32·bits·(the·multiplier)
2039 of·the·generator·state.··The·higher·bits·of·the·state·are·worse.</p><p>The·quality·of·the·output·value·improves·much·by·using·a·scrambler,2039 of·the·generator·state.··The·higher·bits·of·the·state·are·worse.</p><p>The·quality·of·the·output·value·improves·much·by·using·a·scrambler,
2040 instead·of·just·taking·the·low·bits.2040 instead·of·just·taking·the·low·bits.
2041 Function·<a·href="#mwc59_value32/1"><code·class="inline">mwc59_value32</code></a>·is·a·fast·scrambler2041 Function·<a·href="#mwc59_value32/1"><code·class="inline">mwc59_value32</code></a>·is·a·fast·scrambler
Offset 2285, 15 lines modifiedOffset 2285, 15 lines modified
2285 ······<p·class="built-using">2285 ······<p·class="built-using">
2286 ········Built·using2286 ········Built·using
2287 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2287 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2288 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2288 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2289 ······</p>2289 ······</p>
2290 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2290 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2291 ····</footer>2291 ····</footer>
2292 ··</div>2292 ··</div>
2293 </main>2293 </main>
2294 </div>2294 </div>
2295 <script>2295 <script>
2296 ··function·mermaidLoaded()·{2296 ··function·mermaidLoaded()·{
2297 ····mermaid.initialize({2297 ····mermaid.initialize({
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458 ······<div·class="specs">458 ······<div·class="specs">
  
459 ··········<pre·translate="no"><span·class="attribute">-spec</span>·seed(A1,·A2,·A3)·->·undefined·|·<a·href="#t:ran/0">ran</a>()·when·A1·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·A2·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·A3·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>().</pre>459 ··········<pre·translate="no"><span·class="attribute">-spec</span>·seed(A1,·A2,·A3)·->·undefined·|·<a·href="#t:ran/0">ran</a>()·when·A1·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·A2·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>(),·A3·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:integer/0">integer</a>().</pre>
  
460 ······</div>460 ······</div>
  
461 <p>Seeds·random·number·generation·with·integer·values·in·the·process·dictionary·and461 <p>Seeds·random·number·generation·with·integer·values·in·the·process·dictionary·and
462 returns·the·old·state.</p><p>The·following·is·an·easy·way·of·obtaining·a·unique·value·to·seed·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">random</span><span·class="p">:</span><span·class="nf">seed</span><span·class="p"·data-group-id="1538055498-1">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">phash2</span><span·class="p"·data-group-id="1538055498-2">(</span><span·class="p"·data-group-id="1538055498-3">[</span><span·class="nf">node</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·183,·SHA:·cd3b531206eb3ffb0ac61585bd8d49bad0117381cbfdcc3b3a56d61275a4f2f4·...·]8-2">)</span><span·class="p">,</span><span·class="w">462 returns·the·old·state.</p><p>The·following·is·an·easy·way·of·obtaining·a·unique·value·to·seed·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">random</span><span·class="p">:</span><span·class="nf">seed</span><span·class="p"·data-group-id="4489790338-1">(</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">phash2</span><span·class="p"·data-group-id="4489790338-2">(</span><span·class="p"·data-group-id="4489790338-3">[</span><span·class="nf">node</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·183,·SHA:·fb023ac34439bc9652b6706266706451952849cfd87d68938cf073c33e307ef3·...·]8-2">)</span><span·class="p">,</span><span·class="w">
463 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="1538055498-5">(</span><span·class="p"·data-group-id="1538055498-5">)</span><span·class="p">,</span><span·class="w">463 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">monotonic_time</span><span·class="p"·data-group-id="4489790338-5">(</span><span·class="p"·data-group-id="4489790338-5">)</span><span·class="p">,</span><span·class="w">
464 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">unique_integer</span><span·class="p"·data-group-id="1538055498-6">(</span><span·class="p"·data-group-id="1538055498-6">)</span><span·class="p"·data-group-id="1538055498-1">)</span></code></pre><p>For·details,·see·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#phash2/1"><code·class="inline">erlang:phash2/1</code></a>,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#node/0"><code·class="inline">erlang:node/0</code></a>,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#monotonic_time/0"><code·class="inline">erlang:monotonic_time/0</code></a>,464 ············</span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nf">unique_integer</span><span·class="p"·data-group-id="4489790338-6">(</span><span·class="p"·data-group-id="4489790338-6">)</span><span·class="p"·data-group-id="4489790338-1">)</span></code></pre><p>For·details,·see·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#phash2/1"><code·class="inline">erlang:phash2/1</code></a>,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#node/0"><code·class="inline">erlang:node/0</code></a>,·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#monotonic_time/0"><code·class="inline">erlang:monotonic_time/0</code></a>,
465 and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#unique_integer/0"><code·class="inline">erlang:unique_integer/0</code></a>.</p>465 and·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#unique_integer/0"><code·class="inline">erlang:unique_integer/0</code></a>.</p>
466 ··</section>466 ··</section>
467 </section>467 </section>
468 <section·class="detail"·id="uniform/0">468 <section·class="detail"·id="uniform/0">
  
469 ··<div·class="detail-header">469 ··<div·class="detail-header">
470 ····<a·href="#uniform/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">470 ····<a·href="#uniform/0"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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615 ······<p·class="built-using">615 ······<p·class="built-using">
616 ········Built·using616 ········Built·using
617 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the617 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
618 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>618 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
619 ······</p>619 ······</p>
620 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>620 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
621 ····</footer>621 ····</footer>
622 ··</div>622 ··</div>
623 </main>623 </main>
624 </div>624 </div>
625 <script>625 <script>
626 ··function·mermaidLoaded()·{626 ··function·mermaidLoaded()·{
627 ····mermaid.initialize({627 ····mermaid.initialize({
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1371 been·passed,·<a·href="#run/2"><code·class="inline">run/2,3</code></a>·is·committed·to·find·a·match·at·the·current1371 been·passed,·<a·href="#run/2"><code·class="inline">run/2,3</code></a>·is·committed·to·find·a·match·at·the·current
1372 starting·point,·or·not·at·all,·for·example:</p><pre><code·class="text">a+(*COMMIT)b</code></pre><p>This·matches·&quot;xxaab&quot;·but·not·&quot;aacaab&quot;.·It·can·be·thought·of·as·a·kind·of·dynamic1372 starting·point,·or·not·at·all,·for·example:</p><pre><code·class="text">a+(*COMMIT)b</code></pre><p>This·matches·&quot;xxaab&quot;·but·not·&quot;aacaab&quot;.·It·can·be·thought·of·as·a·kind·of·dynamic
1373 anchor,·or·&quot;I've·started,·so·I·must·finish&quot;.·The·name·of·the·most·recently1373 anchor,·or·&quot;I've·started,·so·I·must·finish&quot;.·The·name·of·the·most·recently
1374 passed·(<em>MARK)·in·the·path·is·passed·back·when·(</em>COMMIT)·forces·a·match·failure.</p><p>If·more·than·one·backtracking·verb·exists·in·a·pattern,·a·different·one·that1374 passed·(<em>MARK)·in·the·path·is·passed·back·when·(</em>COMMIT)·forces·a·match·failure.</p><p>If·more·than·one·backtracking·verb·exists·in·a·pattern,·a·different·one·that
1375 follows·(<em>COMMIT)·can·be·triggered·first,·so·merely·passing·(</em>COMMIT)·during·a1375 follows·(<em>COMMIT)·can·be·triggered·first,·so·merely·passing·(</em>COMMIT)·during·a
1376 match·does·not·always·guarantee·that·a·match·must·be·at·this·starting·point.</p><p>Notice·that·(*COMMIT)·at·the·start·of·a·pattern·is·not·the·same·as·an·anchor,1376 match·does·not·always·guarantee·that·a·match·must·be·at·this·starting·point.</p><p>Notice·that·(*COMMIT)·at·the·start·of·a·pattern·is·not·the·same·as·an·anchor,
1377 unless·the·PCRE·start-of-match·optimizations·are·turned·off,·as·shown·in·the1377 unless·the·PCRE·start-of-match·optimizations·are·turned·off,·as·shown·in·the
1378 following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="8347568424-1">(</span><span·class="s">&quot;xyzabc&quot;</span><span·class="p">,</span><span·class="s">&quot;(*COMMIT)abc&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8347568424-2">[</span><span·class="p"·data-group-id="8347568424-3">[·...·truncated·by·diffoscope;·len:·289,·SHA:·7003e87efe5692b45a47cc51f09eb41673469a3b0b3deb9b751464ea4d01da5b·...·]-1">)</span><span·class="p">.</span><span·class="w">1378 following·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="4401625726-1">(</span><span·class="s">&quot;xyzabc&quot;</span><span·class="p">,</span><span·class="s">&quot;(*COMMIT)abc&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="4401625726-2">[</span><span·class="p"·data-group-id="4401625726-3">[·...·truncated·by·diffoscope;·len:·289,·SHA:·78e23f096bec9066de5bd467ae72a306ec4dd2ba5e4ed6bdc7f9f3c40a945274·...·]-1">)</span><span·class="p">.</span><span·class="w">
1379 </span><span·class="p"·data-group-id="8347568424-4">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="8347568424-5">[</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="8347568424-5">]</span><span·class="p"·data-group-id="834756[·...·truncated·by·diffoscope;·len:·4,·SHA:·6a618f6b82f906a08c1136d213b80efb7c5432cfb82b604b9c60834561132386·...·]-4">}</span><span·class="gp·unselectable">1379 </span><span·class="p"·data-group-id="4401625726-4">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="4401625726-5">[</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="4401625726-5">]</span><span·class="p"·data-group-id="440162[·...·truncated·by·diffoscope;·len:·4,·SHA:·25ebe3918b0bfaf16e3e8c356a2cf5f8d6c113cf2c3721cbcf47a401bd5412d9·...·]-4">}</span><span·class="gp·unselectable">
1380 2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="8347568424-6">(</span><span·class="s">&quot;xyzabc&quot;</span><span·class="p">,</span><span·class="s">&quot;(*COMMIT)abc&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8347568424-7">[</span><span·class="p"·data-group-id="8347568424-8">[·...·truncated·by·diffoscope;·len:·354,·SHA:·2dbbcc12508862ce3ab7c831d256a69886e15c6227b829a408e8ac7311b2bd6e·...·]-6">)</span><span·class="p">.</span><span·class="w">1380 2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="4401625726-6">(</span><span·class="s">&quot;xyzabc&quot;</span><span·class="p">,</span><span·class="s">&quot;(*COMMIT)abc&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="4401625726-7">[</span><span·class="p"·data-group-id="4401625726-8">[·...·truncated·by·diffoscope;·len:·354,·SHA:·51d54e3371d2c4fb5c34d753a8c3012092da033f3a6fe78574330dce51f1eeba·...·]-6">)</span><span·class="p">.</span><span·class="w">
1381 </span><span·class="ss">nomatch</span></code></pre><p>For·this·pattern,·PCRE·knows·that·any·match·must·start·with·&quot;a&quot;,·so·the1381 </span><span·class="ss">nomatch</span></code></pre><p>For·this·pattern,·PCRE·knows·that·any·match·must·start·with·&quot;a&quot;,·so·the
1382 optimization·skips·along·the·subject·to·&quot;a&quot;·before·applying·the·pattern·to·the1382 optimization·skips·along·the·subject·to·&quot;a&quot;·before·applying·the·pattern·to·the
1383 first·set·of·data.·The·match·attempt·then·succeeds.·In·the·second·call·the1383 first·set·of·data.·The·match·attempt·then·succeeds.·In·the·second·call·the
1384 <code·class="inline">no_start_optimize</code>·disables·the·optimization·that·skips·along·to·the·first1384 <code·class="inline">no_start_optimize</code>·disables·the·optimization·that·skips·along·to·the·first
1385 character.·The·pattern·is·now·applied·starting·at·&quot;x&quot;,·and·so·the·(*COMMIT)1385 character.·The·pattern·is·now·applied·starting·at·&quot;x&quot;,·and·so·the·(*COMMIT)
1386 causes·the·match·to·fail·without·trying·any·other·starting·points.</p><p>The·following·verb·causes·the·match·to·fail·at·the·current·starting·position·in1386 causes·the·match·to·fail·without·trying·any·other·starting·points.</p><p>The·following·verb·causes·the·match·to·fail·at·the·current·starting·position·in
1387 the·subject·if·there·is·a·later·matching·failure·that·causes·backtracking·to1387 the·subject·if·there·is·a·later·matching·failure·that·causes·backtracking·to
Offset 2084, 40 lines modifiedOffset 2084, 40 lines modified
  
2084 ··········<pre·translate="no"><span·class="attribute">-spec</span>·inspect(MP,·Item)·->·{namelist,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()]}·when·MP·::·<a·href="#t:mp/0">mp</a>(),·Item·::·namelist.</pre>2084 ··········<pre·translate="no"><span·class="attribute">-spec</span>·inspect(MP,·Item)·->·{namelist,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:binary/0">binary</a>()]}·when·MP·::·<a·href="#t:mp/0">mp</a>(),·Item·::·namelist.</pre>
  
2085 ······</div>2085 ······</div>
  
2086 <p>Takes·a·compiled·regular·expression·and·an·item,·and·returns·the·relevant·data2086 <p>Takes·a·compiled·regular·expression·and·an·item,·and·returns·the·relevant·data
2087 from·the·regular·expression.</p><p>The·only·supported·item·is·<code·class="inline">namelist</code>,·which·returns·the·tuple·<code·class="inline">{namelist,·[binary()]}</code>,2087 from·the·regular·expression.</p><p>The·only·supported·item·is·<code·class="inline">namelist</code>,·which·returns·the·tuple·<code·class="inline">{namelist,·[binary()]}</code>,
2088 containing·the·names·of·all·(unique)·named·subpatterns·in·the·regular·expression.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="7181081881-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">MP</span><span·class="p"·data-group-id="7181081881-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span·cl[·...·truncated·by·diffoscope;·len:·217,·SHA:·4a9f408ed56842b763462b2fb37ddb27b2695e93563953d7085ca129931d9a86·...·]-2">)</span><span·class="p">.</span><span·class="w">2088 containing·the·names·of·all·(unique)·named·subpatterns·in·the·regular·expression.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="2681305670-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">MP</span><span·class="p"·data-group-id="2681305670-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span·cl[·...·truncated·by·diffoscope;·len:·217,·SHA:·965bc3f6d2f99520f8e7a0704dab234f705d74e1d21d37d9a91c8a9884e55095·...·]-2">)</span><span·class="p">.</span><span·class="w">
2089 </span><span·class="p"·data-group-id="7181081881-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7181081881-4">{</span><span·class="ss">re_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">2089 </span><span·class="p"·data-group-id="2681305670-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2681305670-4">{</span><span·class="ss">re_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
2090 ················</span><span·class="p"·data-group-id="7181081881-5">&lt;&lt;</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">119</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="w">2090 ················</span><span·class="p"·data-group-id="2681305670-5">&lt;&lt;</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">119</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="w">
2091 ··················</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7181081881-5">&gt;&gt;</span><span·class="p"·data-group-id="7181081881-4">}</span><span·class="p"·data-group-id="7181081881-3">}</span><span·class="gp·unselectable">2091 ··················</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2681305670-5">&gt;&gt;</span><span·class="p"·data-group-id="2681305670-4">}</span><span·class="p"·data-group-id="2681305670-3">}</span><span·class="gp·unselectable">
2092 2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">inspect</span><span·class="p"·data-group-id="7181081881-6">(</span><span·class="n">MP</span><span·class="p">,</span><span·class="ss">namelist</span><span·class="p"·data-group-id="7181081881-6">)</span><span·class="p">.</span><span·class="w">2092 2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">inspect</span><span·class="p"·data-group-id="2681305670-6">(</span><span·class="n">MP</span><span·class="p">,</span><span·class="ss">namelist</span><span·class="p"·data-group-id="2681305670-6">)</span><span·class="p">.</span><span·class="w">
2093 </span><span·class="p"·data-group-id="7181081881-7">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="p"·data-group-id="7181081881-8">[</span><span·class="p"·data-group-id="7181081881-9">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·489,·SHA:·d9ce290762319fdabec11e00f7f252ec2c70c874e72faa0734dfba2c6deb1a5a·...·]-7">}</span><span·class="gp·unselectable">2093 </span><span·class="p"·data-group-id="2681305670-7">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="p"·data-group-id="2681305670-8">[</span><span·class="p"·data-group-id="2681305670-9">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·489,·SHA:·cfb4031997723c90252e7d4b1569d000d1e7b607902f371cc9d3be0c7b443a76·...·]-7">}</span><span·class="gp·unselectable">
2094 3&gt;·</span><span·class="p"·data-group-id="7181081881-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">MPD</span><span·class="p"·data-group-id="7181081881-12">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span[·...·truncated·by·diffoscope;·len:·385,·SHA:·ca9f27e0386ac44ae8ad54c138249c2dc012ae187384f75e2d4f0e375f673bd7·...·]-13">)</span><span·class="p">.</span><span·class="w">2094 3&gt;·</span><span·class="p"·data-group-id="2681305670-12">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">MPD</span><span·class="p"·data-group-id="2681305670-12">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span[·...·truncated·by·diffoscope;·len:·385,·SHA:·74d933ab96ad681c3d942f31bdbb780e3f027764377a124ea1931d3854fcc3c0·...·]-13">)</span><span·class="p">.</span><span·class="w">
2095 </span><span·class="p"·data-group-id="7181081881-15">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7181081881-16">{</span><span·class="ss">re_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">2095 </span><span·class="p"·data-group-id="2681305670-15">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2681305670-16">{</span><span·class="ss">re_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
2096 ················</span><span·class="p"·data-group-id="7181081881-17">&lt;&lt;</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">119</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="w">2096 ················</span><span·class="p"·data-group-id="2681305670-17">&lt;&lt;</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">119</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">8</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="w">
2097 ··················</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7181081881-17">&gt;&gt;</span><span·class="p"·data-group-id="7181081881-16">}</span><span·class="p"·data-group-id="7181081881-15">}</span><span·class="gp·unselectable">2097 ··················</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="2681305670-17">&gt;&gt;</span><span·class="p"·data-group-id="2681305670-16">}</span><span·class="p"·data-group-id="2681305670-15">}</span><span·class="gp·unselectable">
2098 4&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">inspect</span><span·class="p"·data-group-id="7181081881-18">(</span><span·class="n">MPD</span><span·class="p">,</span><span·class="ss">namelist</span><span·class="p"·data-group-id="7181081881-18">)</span><span·class="p">.</span><span·class="w">2098 4&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">inspect</span><span·class="p"·data-group-id="2681305670-18">(</span><span·class="n">MPD</span><span·class="p">,</span><span·class="ss">namelist</span><span·class="p"·data-group-id="2681305670-18">)</span><span·class="p">.</span><span·class="w">
2099 </span><span·class="p"·data-group-id="7181081881-19">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="p"·data-group-id="7181081881-20">[</span><span·class="p"·data-group-id="7181081881-21">&lt;&lt;</span><span·class="s">&quot;B&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·312,·SHA:·a068a531dc515a90fb3f4ab7c864f7e87ff6f7d2ee9917ec755543900979c28d·...·]-19">}</span></code></pre><p>Notice·in·the·second·example·that·the·duplicate·name·only·occurs·once·in·the2099 </span><span·class="p"·data-group-id="2681305670-19">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="p"·data-group-id="2681305670-20">[</span><span·class="p"·data-group-id="2681305670-21">&lt;&lt;</span><span·class="s">&quot;B&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·312,·SHA:·d6578d9fa5775a85ad404a37b6021beab40de30db8e3a984b62138daafc6327a·...·]-19">}</span></code></pre><p>Notice·in·the·second·example·that·the·duplicate·name·only·occurs·once·in·the
2100 returned·list,·and·that·the·list·is·in·alphabetical·order·regardless·of·where2100 returned·list,·and·that·the·list·is·in·alphabetical·order·regardless·of·where
2101 the·names·are·positioned·in·the·regular·expression.·The·order·of·the·names·is2101 the·names·are·positioned·in·the·regular·expression.·The·order·of·the·names·is
2102 the·same·as·the·order·of·captured·subexpressions·if·<code·class="inline">{capture,·all_names}</code>·is2102 the·same·as·the·order·of·captured·subexpressions·if·<code·class="inline">{capture,·all_names}</code>·is
2103 specified·as·an·option·to·<a·href="#run/3"><code·class="inline">run/3</code></a>.·You·can·therefore·create·a·name-to-value2103 specified·as·an·option·to·<a·href="#run/3"><code·class="inline">run/3</code></a>.·You·can·therefore·create·a·name-to-value
2104 mapping·from·the·result·of·<a·href="#run/3"><code·class="inline">run/3</code></a>·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="7615707292-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">MP</span><span·class="p"·data-group-id="7615707292-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span·cl[·...·truncated·by·diffoscope;·len:·217,·SHA:·4c59a8f80d6209e4600234a5aed5cd22c162a21ce366ff7c9aedd0ead7091f11·...·]-2">)</span><span·class="p">.</span><span·class="w">2104 mapping·from·the·result·of·<a·href="#run/3"><code·class="inline">run/3</code></a>·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="3473774069-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">MP</span><span·class="p"·data-group-id="3473774069-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span·cl[·...·truncated·by·diffoscope;·len:·217,·SHA:·ca9a0c2c03e63ae5549671be92d3cab1eb2c8b1dd79e01b8ca453580d28e5498·...·]-2">)</span><span·class="p">.</span><span·class="w">
2105 </span><span·class="p"·data-group-id="7615707292-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7615707292-4">{</span><span·class="ss">re_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">2105 </span><span·class="p"·data-group-id="3473774069-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3473774069-4">{</span><span·class="ss">re_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
2106 ················</span><span·class="p"·data-group-id="7615707292-5">&lt;&lt;</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">119</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="w">2106 ················</span><span·class="p"·data-group-id="3473774069-5">&lt;&lt;</span><span·class="mi">69</span><span·class="p">,</span><span·class="mi">82</span><span·class="p">,</span><span·class="mi">67</span><span·class="p">,</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">119</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="w">
2107 ··················</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7615707292-5">&gt;&gt;</span><span·class="p"·data-group-id="7615707292-4">}</span><span·class="p"·data-group-id="7615707292-3">}</span><span·class="gp·unselectable">2107 ··················</span><span·class="mi">255</span><span·class="p">,</span><span·class="mi">255</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="3473774069-5">&gt;&gt;</span><span·class="p"·data-group-id="3473774069-4">}</span><span·class="p"·data-group-id="3473774069-3">}</span><span·class="gp·unselectable">
2108 2&gt;·</span><span·class="p"·data-group-id="7615707292-6">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="7615707292-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·251,·SHA:·a496d815d5eff276d10f3aadf6529883bd7855aa5f041beeb1152c352ef4e59a·...·]-7">)</span><span·class="p">.</span><span·class="w">2108 2&gt;·</span><span·class="p"·data-group-id="3473774069-6">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="3473774069-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·251,·SHA:·aa8b95cfec3b3055b467030eb3c6153f8ce5a7851dcccccd1f4377e113c36501·...·]-7">)</span><span·class="p">.</span><span·class="w">
2109 </span><span·class="p"·data-group-id="7615707292-8">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="p"·data-group-id="7615707292-9">[</span><span·class="p"·data-group-id="7615707292-10">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id="7615707292-10">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="7615707292-11">&lt;&lt;</span><span·class="s">&quot;B&quot;</span><span·class="p"·data-group-id="7615707292-11">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="7615707292-12">&lt;&lt;</span><span·class="s">&quot;C&quot;</span><span·class="p"·data-group-id="7615707292-12">&gt;&gt;</span><span·class="p"·data-group-id="7615707292-9">]</span><span·class="p"·data-group-id="7615707292-8">}</span><span·class="gp·unselectable"> 
2110 3&gt;·</span><span·class="p"·data-group-id="7615707292-13">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="n">L</span><span·class="p"·data-group-id="7615707292-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="7615707292-14">(</span><span·class="s">&quot;AA&quot;</span><span·class="p">,</span><span·class="n">MP</span><span·class="p">,</span><span·class="p"·data-group-id="7615707292-15">[</span><span·class="p"·data-group-id="7615707292-16">{</span><span·class="ss">capture</span><span·class="p">,</span><span·class="ss">all_names</span><span·class="p">,</span><span·class="ss">binary</span><span·class="p"·data-group-id="7615707292-16">}</span><span·class="p"·data-group-id="7615707292-15">]</span><span·class="p"·data-group-id="7615707292-14">)</span><span·class="p">.</span><span·class="w"> 
2111 </span><span·class="p"·data-group-id="7615707292-17">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="7615707292-18">[</span><span·class="p"·data-group-id="7615707292-19">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·422,·SHA:·6bd80a8835ba56ee7be5c8a653930f193320f81d752593f90917acb71f900566·...·]">}</span><span·class="gp·unselectable">2109 </span><span·class="p"·data-group-id="3473774069-8">{</span><span·class="ss">namelist</span><span·class="p">,</span><span·class="p"·data-group-id="3473774069-9">[</span><span·class="p"·data-group-id="3473774069-10">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·493,·SHA:·5117b6eefa22bd3c21089b8d8bc956823e42dcb5049126ace89ceaaecdc9644f·...·]">}</span><span·class="gp·unselectable">
 2110 3&gt;·</span><span·class="p"·data-group-id="3473774069-13">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="n">L</span><span·class="p"·data-group-id="3473774069-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="3473774069-14">(</span><span·class="s">&quot;AA&quot;</span><span·class="p">,</span><span·class="n">MP</span><span·class="p">,</span><span·class="p"·data-group-id="3473774069-15">[</span><span·class="p"·data-group-id="3473774069-16">{</span><span·class="ss">capture</span><span·class="p">,</span><span·class="ss">all_names</span><span·class="p">,</span><span·class="ss">binary</span><span·class="p"·data-group-id="3473774069-16">}</span><span·class="p"·data-group-id="3473774069-15">]</span><span·class="p"·data-group-id="3473774069-14">)</span><span·class="p">.</span><span·class="w">
 2111 </span><span·class="p"·data-group-id="3473774069-17">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="3473774069-18">[</span><span·class="p"·data-group-id="3473774069-19">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id="3473774069-19">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="3473774069-20">&lt;&lt;</span><span·class="p"·data-group-id="3473774069-20">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="3473774069-21">&lt;&lt;</span><span·class="p"·data-group-id="3473774069-21">&gt;&gt;</span><span·class="p"·data-group-id="3473774069-18">]</span><span·class="p"·data-group-id="3473774069-17">}</span><span·class="gp·unselectable">
2112 4&gt;·</span><span·class="n">NameMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">zip</span><span·class="p"·data-group-id="7615707292-22">(</span><span·class="n">N</span><span·class="p">,</span><span·class="n">L</span><span·class="p"·data-group-id="7615707292-22">)</span><span·class="p">.</span><span·class="w">2112 4&gt;·</span><span·class="n">NameMap</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">zip</span><span·class="p"·data-group-id="3473774069-22">(</span><span·class="n">N</span><span·class="p">,</span><span·class="n">L</span><span·class="p"·data-group-id="3473774069-22">)</span><span·class="p">.</span><span·class="w">
2113 </span><span·class="p"·data-group-id="7615707292-23">[</span><span·class="p"·data-group-id="7615707292-24">{</span><span·class="p"·data-group-id="7615707292-25">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id="7615707292-25">&gt;&gt;</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·1128,·SHA:·d895e64ad6675b10607ca4a5c726d48c1426f51a1752377d2a1fb9b921873c09·...·]-23">]</span></code></pre>2113 </span><span·class="p"·data-group-id="3473774069-23">[</span><span·class="p"·data-group-id="3473774069-24">{</span><span·class="p"·data-group-id="3473774069-25">&lt;&lt;</span><span·class="s">&quot;A&quot;</span><span·class="p"·data-group-id="3473774069-25">&gt;&gt;</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·1128,·SHA:·4e9c139460e0a9faa2fff302698a7c596b98cc83e3828e11eaac2574a02136d8·...·]-23">]</span></code></pre>
2114 ··</section>2114 ··</section>
2115 </section>2115 </section>
2116 <section·class="detail"·id="replace/3">2116 <section·class="detail"·id="replace/3">
  
2117 ··<div·class="detail-header">2117 ··<div·class="detail-header">
2118 ····<a·href="#replace/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">2118 ····<a·href="#replace/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
2119 ······<i·class="ri-link-m"·aria-hidden="true"></i>2119 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 2198, 24 lines modifiedOffset 2198, 24 lines modified
2198 both·the·regular·expression·and·<code·class="inline">Subject</code>·are·to·specified·as·valid·Unicode2198 both·the·regular·expression·and·<code·class="inline">Subject</code>·are·to·specified·as·valid·Unicode
2199 <code·class="inline">charlist()</code>s.</p><p>If·the·replacement·is·given·as·a·string,·it·can·contain·the·special·character2199 <code·class="inline">charlist()</code>s.</p><p>If·the·replacement·is·given·as·a·string,·it·can·contain·the·special·character
2200 <code·class="inline">&amp;</code>,·which·inserts·the·whole·matching·expression·in·the·result,·and·the·special2200 <code·class="inline">&amp;</code>,·which·inserts·the·whole·matching·expression·in·the·result,·and·the·special
2201 sequence·<code·class="inline">\</code>N·(where·N·is·an·integer·&gt;·0),·<code·class="inline">\g</code>N,·or·<code·class="inline">\g{</code>N<code·class="inline">}</code>,·resulting·in·the2201 sequence·<code·class="inline">\</code>N·(where·N·is·an·integer·&gt;·0),·<code·class="inline">\g</code>N,·or·<code·class="inline">\g{</code>N<code·class="inline">}</code>,·resulting·in·the
2202 subexpression·number·N,·is·inserted·in·the·result.·If·no·subexpression·with·that2202 subexpression·number·N,·is·inserted·in·the·result.·If·no·subexpression·with·that
2203 number·is·generated·by·the·regular·expression,·nothing·is·inserted.</p><p>To·insert·an·&amp;·or·a·\·in·the·result,·precede·it·with·a·\.·Notice·that·Erlang2203 number·is·generated·by·the·regular·expression,·nothing·is·inserted.</p><p>To·insert·an·&amp;·or·a·\·in·the·result,·precede·it·with·a·\.·Notice·that·Erlang
2204 already·gives·a·special·meaning·to·\·in·literal·strings,·so·a·single·\·must·be2204 already·gives·a·special·meaning·to·\·in·literal·strings,·so·a·single·\·must·be
2205 written·as·<code·class="inline">&quot;\\&quot;</code>·and·therefore·a·double·\·as·<code·class="inline">&quot;\\\\&quot;</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">replace</span><span·class="p"·data-group-id="0300917167-1">(</span><span·class="s">&quot;abcd&quot;</span><span·class="p">,</span><span·class="s">&quot;c&quot;</span><span·class="p">,</span><span·class="s">&quot;[&amp;]&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0300917167-2">[</span><span·class="p"·data-group-id="0300917167-3">{</span><span·class="ss">return</span><span·class="p">,</span><span·class="ss">list</span><span·class="p"·data-group-id="0300917167-3">}</span><span·class="p"·data-group-id="0300917167-2">]</span><span·class="p"·data-group-id="0300917167-1">)</span><span·class="p">.</span><span·class="w"> 
2206 </span><span·class="s">&quot;ab[c]d&quot;</span></code></pre><p>while</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">replace</span><span·class[·...·truncated·by·diffoscope;·len:·568,·SHA:·aa832de7188e4b09ceb2a3ac2375862e38f0b70767102d12eab090577c0e0718·...·]-1">)</span><span·class="p">.</span><span·class="w">2205 written·as·<code·class="inline">&quot;\\&quot;</code>·and·therefore·a·double·\·as·<code·class="inline">&quot;\\\\&quot;</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·clas[·...·truncated·by·diffoscope;·len:·648,·SHA:·e9045cc56bcc82c0d5e3fd4c7565a0144c399777485b9b0553b050af90935475·...·]-1">)</span><span·class="p">.</span><span·class="w">
 2206 </span><span·class="s">&quot;ab[c]d&quot;</span></code></pre><p>while</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">replace</span><span·class="p"·data-group-id="4719365230-1">(</span><span·class="s">&quot;abcd&quot;</span><span·class="p">,</span><span·class="s">&quot;c&quot;</span><span·class="p">,</span><span·class="s">&quot;[\\&amp;]&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="4719365230-2">[</span><span·class="p"·data-group-id="4719365230-3">{</span><span·class="ss">return</span><span·class="p">,</span><span·class="ss">list</span><span·class="p"·data-group-id="4719365230-3">}</span><span·class="p"·data-group-id="4719365230-2">]</span><span·class="p"·data-group-id="4719365230-1">)</span><span·class="p">.</span><span·class="w">
2207 </span><span·class="s">&quot;ab[&amp;]d&quot;</span></code></pre><p>If·the·replacement·is·given·as·a·fun,·it·will·be·called·with·the·whole·matching2207 </span><span·class="s">&quot;ab[&amp;]d&quot;</span></code></pre><p>If·the·replacement·is·given·as·a·fun,·it·will·be·called·with·the·whole·matching
2208 expression·as·the·first·argument·and·a·list·of·subexpression·matches·in·the2208 expression·as·the·first·argument·and·a·list·of·subexpression·matches·in·the
2209 order·in·which·they·appear·in·the·regular·expression.·The·returned·value·will·be2209 order·in·which·they·appear·in·the·regular·expression.·The·returned·value·will·be
2210 inserted·in·the·result.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">replace</span><span·class="p"·data-group-id="1040095063-1">(</span><span·class="s">&quot;abcd&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.(.)&quot;</span><span·class="p">,</span><span·class="w">2210 inserted·in·the·result.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">replace</span><span·class="p"·data-group-id="6294373834-1">(</span><span·class="s">&quot;abcd&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.(.)&quot;</span><span·class="p">,</span><span·class="w">
2211 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="1040095063-2">(</span><span·class="n">Whole</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1040095063-3">[</span><span·class="p"·data-group-id="1040095063-4">&lt;&lt;</span><span·class="n">C</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·133,·SHA:·efa23ca09e3b65b48937fce25cb7dc3cdb009844d1d02f59f4dccf1a09ec8c9f·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">2211 ····</span><span·class="nf">fun</span><span·class="p"·data-group-id="6294373834-2">(</span><span·class="n">Whole</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6294373834-3">[</span><span·class="p"·data-group-id="6294373834-4">&lt;&lt;</span><span·class="n">C</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·133,·SHA:·a64ec8cfa7032b5cddf58a09f5aebbe3be4c941c87877d4b3ed71f9872ec5013·...·]-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
2212 ·········</span><span·class="p"·data-group-id="1040095063-5">&lt;&lt;</span><span·class="sc">$#</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Whole</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$-</sp[·...·truncated·by·diffoscope;·len:·492,·SHA:·2b4033d93d672dacd7de1b6fb3d94865ab1be87e09dc55ec2bfdf903d76cd7b1·...·]-5">&gt;&gt;</span><span·class="w">2212 ·········</span><span·class="p"·data-group-id="6294373834-5">&lt;&lt;</span><span·class="sc">$#</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Whole</span><span·class="o">/</span><span·class="ss">binary</span><span·class="p">,</span><span·class="w">·</span><span·class="sc">$-</sp[·...·truncated·by·diffoscope;·len:·492,·SHA:·c08a92a225be1fdbb4ebdf2fb1bc1370e7535a5d678b1356235434657c566f5b·...·]-5">&gt;&gt;</span><span·class="w">
2213 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">2213 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
2214 ····</span><span·class="p"·data-group-id="1040095063-7">[</span><span·class="p"·data-group-id="1040095063-8">{</span><span·class="ss">return</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">list</span><span·class="p"·data-group-id="1040095063-8">}</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·72,·SHA:·6c461be33c83740627a3746182e50cca43781140813306cb3b18a63ba1c5adf9·...·]-1">)</span><span·class="p">.</span><span·class="w">2214 ····</span><span·class="p"·data-group-id="6294373834-7">[</span><span·class="p"·data-group-id="6294373834-8">{</span><span·class="ss">return</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">list</span><span·class="p"·data-group-id="6294373834-8">}</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·72,·SHA:·f8e4feefbd330f77e59ab46ea3fe4661fc1d8121288d5309aa60de86d56a8832·...·]-1">)</span><span·class="p">.</span><span·class="w">
2215 </span><span·class="s">&quot;#ab-B#cd&quot;</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Non-matching·optional·subexpressions·will·not·be·included·in·the·list·of2215 </span><span·class="s">&quot;#ab-B#cd&quot;</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Non-matching·optional·subexpressions·will·not·be·included·in·the·list·of
2216 subexpression·matches·if·they·are·the·last·subexpressions·in·the·regular2216 subexpression·matches·if·they·are·the·last·subexpressions·in·the·regular
2217 expression.</p><p><em>Example:</em></p><p>The·regular·expression·<code·class="inline">&quot;(a)(b)?(c)?&quot;</code>·(&quot;a&quot;,·optionally·followed·by·&quot;b&quot;,2217 expression.</p><p><em>Example:</em></p><p>The·regular·expression·<code·class="inline">&quot;(a)(b)?(c)?&quot;</code>·(&quot;a&quot;,·optionally·followed·by·&quot;b&quot;,
2218 optionally·followed·by·&quot;c&quot;)·will·create·the·following·subexpression·lists:</p><ul><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;,·&lt;&lt;&quot;b&quot;&gt;&gt;,·&lt;&lt;&quot;c&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;abc&quot;</code></li><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;,·&lt;&lt;&gt;&gt;,·&lt;&lt;&quot;c&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;acx&quot;</code></li><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;,·&lt;&lt;&quot;b&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;abx&quot;</code></li><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;axx&quot;</code></li></ul></section><p>As·with·<a·href="#run/3"><code·class="inline">run/3</code></a>,·compilation·errors·raise·the·<code·class="inline">badarg</code>·exception.2218 optionally·followed·by·&quot;c&quot;)·will·create·the·following·subexpression·lists:</p><ul><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;,·&lt;&lt;&quot;b&quot;&gt;&gt;,·&lt;&lt;&quot;c&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;abc&quot;</code></li><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;,·&lt;&lt;&gt;&gt;,·&lt;&lt;&quot;c&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;acx&quot;</code></li><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;,·&lt;&lt;&quot;b&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;abx&quot;</code></li><li><code·class="inline">[&lt;&lt;&quot;a&quot;&gt;&gt;]</code>·when·applied·to·the·string·<code·class="inline">&quot;axx&quot;</code></li></ul></section><p>As·with·<a·href="#run/3"><code·class="inline">run/3</code></a>,·compilation·errors·raise·the·<code·class="inline">badarg</code>·exception.
2219 <a·href="#compile/2"><code·class="inline">compile/2</code></a>·can·be·used·to·get·more·information·about·the·error.</p>2219 <a·href="#compile/2"><code·class="inline">compile/2</code></a>·can·be·used·to·get·more·information·about·the·error.</p>
2220 ··</section>2220 ··</section>
2221 </section>2221 </section>
Offset 2320, 27 lines modifiedOffset 2320, 27 lines modified
2320 any·matching·subexpressions·(or·as·specified·by·option·<code·class="inline">capture</code>.·The2320 any·matching·subexpressions·(or·as·specified·by·option·<code·class="inline">capture</code>.·The
2321 <code·class="inline">Captured</code>·part·of·the·return·value·is·hence·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:list/0"><code·class="inline">list/0</code></a>·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:list/0"><code·class="inline">list/0</code></a>s·when2321 <code·class="inline">Captured</code>·part·of·the·return·value·is·hence·a·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:list/0"><code·class="inline">list/0</code></a>·of·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:list/0"><code·class="inline">list/0</code></a>s·when
2322 this·option·is·specified.</p><p>The·interaction·of·option·<code·class="inline">global</code>·with·a·regular·expression·that·matches·an2322 this·option·is·specified.</p><p>The·interaction·of·option·<code·class="inline">global</code>·with·a·regular·expression·that·matches·an
2323 empty·string·surprises·some·users.·When·option·<code·class="inline">global</code>·is·specified,2323 empty·string·surprises·some·users.·When·option·<code·class="inline">global</code>·is·specified,
2324 <a·href="#run/3"><code·class="inline">run/3</code></a>·handles·empty·matches·in·the·same·way·as·Perl:·a2324 <a·href="#run/3"><code·class="inline">run/3</code></a>·handles·empty·matches·in·the·same·way·as·Perl:·a
2325 zero-length·match·at·any·point·is·also·retried·with·options2325 zero-length·match·at·any·point·is·also·retried·with·options
2326 <code·class="inline">[anchored,·notempty_atstart]</code>.·If·that·search·gives·a·result·of·length·&gt;·0,2326 <code·class="inline">[anchored,·notempty_atstart]</code>.·If·that·search·gives·a·result·of·length·&gt;·0,
2327 the·result·is·included.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="0369936138-1">(</span><span·class="s">&quot;cat&quot;</span><span·class="p">,</span><span·class="s">&quot;(|at)&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0369936138-2">[</span><span·class="ss">global</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·69,·SHA:·3af31b1781761123b383d1282718af5ca6375c5bd4de772f9f326e985c9a37ab·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·following·matchings·are·performed:</p><ul><li><p><strong>At·offset·<code·class="inline">0</code></strong>·-·The·regular·expression·<code·class="inline">(|at)</code>·first·match·at·the2327 the·result·is·included.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="2651860915-1">(</span><span·class="s">&quot;cat&quot;</span><span·class="p">,</span><span·class="s">&quot;(|at)&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="2651860915-2">[</span><span·class="ss">global</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·69,·SHA:·542c7d37f1660bee58ae8763de5d59f517130d47be43e7d8e653dda38e6dd535·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·following·matchings·are·performed:</p><ul><li><p><strong>At·offset·<code·class="inline">0</code></strong>·-·The·regular·expression·<code·class="inline">(|at)</code>·first·match·at·the
2328 initial·position·of·string·<code·class="inline">cat</code>,·giving·the·result·set·<code·class="inline">[{0,0},{0,0}]</code>·(the2328 initial·position·of·string·<code·class="inline">cat</code>,·giving·the·result·set·<code·class="inline">[{0,0},{0,0}]</code>·(the
2329 second·<code·class="inline">{0,0}</code>·is·because·of·the·subexpression·marked·by·the·parentheses).2329 second·<code·class="inline">{0,0}</code>·is·because·of·the·subexpression·marked·by·the·parentheses).
2330 As·the·length·of·the·match·is·0,·we·do·not·advance·to·the·next·position·yet.</p></li><li><p><strong>At·offset·<code·class="inline">0</code>·with·<code·class="inline">[anchored,·notempty_atstart]</code></strong>·-·The·search·is2330 As·the·length·of·the·match·is·0,·we·do·not·advance·to·the·next·position·yet.</p></li><li><p><strong>At·offset·<code·class="inline">0</code>·with·<code·class="inline">[anchored,·notempty_atstart]</code></strong>·-·The·search·is
2331 retried·with·options·<code·class="inline">[anchored,·notempty_atstart]</code>·at·the·same·position,2331 retried·with·options·<code·class="inline">[anchored,·notempty_atstart]</code>·at·the·same·position,
2332 which·does·not·give·any·interesting·result·of·longer·length,·so·the·search2332 which·does·not·give·any·interesting·result·of·longer·length,·so·the·search
2333 position·is·advanced·to·the·next·character·(<code·class="inline">a</code>).</p></li><li><p><strong>At·offset·<code·class="inline">1</code></strong>·-·The·search·results·in·<code·class="inline">[{1,0},{1,0}]</code>,·so·this·search·is2333 position·is·advanced·to·the·next·character·(<code·class="inline">a</code>).</p></li><li><p><strong>At·offset·<code·class="inline">1</code></strong>·-·The·search·results·in·<code·class="inline">[{1,0},{1,0}]</code>,·so·this·search·is
2334 also·repeated·with·the·extra·options.</p></li><li><p><strong>At·offset·<code·class="inline">1</code>·with·<code·class="inline">[anchored,·notempty_atstart]</code></strong>·-·Alternative·<code·class="inline">ab</code>·is2334 also·repeated·with·the·extra·options.</p></li><li><p><strong>At·offset·<code·class="inline">1</code>·with·<code·class="inline">[anchored,·notempty_atstart]</code></strong>·-·Alternative·<code·class="inline">ab</code>·is
2335 found·and·the·result·is·[{1,2},{1,2}].·The·result·is·added·to·the·list2335 found·and·the·result·is·[{1,2},{1,2}].·The·result·is·added·to·the·list
2336 of·results·and·the·position·in·the·search·string·is·advanced·two·steps.</p></li><li><p><strong>At·offset·<code·class="inline">3</code></strong>·-·The·search·once·again·matches·the·empty·string,·giving2336 of·results·and·the·position·in·the·search·string·is·advanced·two·steps.</p></li><li><p><strong>At·offset·<code·class="inline">3</code></strong>·-·The·search·once·again·matches·the·empty·string,·giving
2337 <code·class="inline">[{3,0},{3,0}]</code>.</p></li><li><p><strong>At·offset·<code·class="inline">1</code>·with·<code·class="inline">[anchored,·notempty_atstart]</code></strong>·-·This·gives·no·result2337 <code·class="inline">[{3,0},{3,0}]</code>.</p></li><li><p><strong>At·offset·<code·class="inline">1</code>·with·<code·class="inline">[anchored,·notempty_atstart]</code></strong>·-·This·gives·no·result
2338 of·length·&gt;·0·and·we·are·at·the·last·position,·so·the·global·search·is2338 of·length·&gt;·0·and·we·are·at·the·last·position,·so·the·global·search·is
2339 complete.</p></li></ul><p>The·result·of·the·call·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2548120360-1">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="2548120360-2">[</span><span·class="p"·data-group-id="2548120360-3">[</span><span·class="p"·data-group-id="2548120360-4">{</span><span·class="mi">0</sp[·...·truncated·by·diffoscope;·len:·2008,·SHA:·a3fba2e777b3b7e4c6243730192ce92264afd7382509f14797a5b590117f7083·...·]-1">}</span></code></pre></li><li><p><strong><code·class="inline">notempty</code></strong>·-·An·empty·string·is·not·considered·to·be·a·valid·match·if·this2339 complete.</p></li></ul><p>The·result·of·the·call·is:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6506269911-1">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="6506269911-2">[</span><span·class="p"·data-group-id="6506269911-3">[</span><span·class="p"·data-group-id="6506269911-4">{</span><span·class="mi">0</sp[·...·truncated·by·diffoscope;·len:·2008,·SHA:·5c2d6668ed339faeb59fb468c11a4aa37c835f6fc23ab15ef7a7488ceb0c5a31·...·]-1">}</span></code></pre></li><li><p><strong><code·class="inline">notempty</code></strong>·-·An·empty·string·is·not·considered·to·be·a·valid·match·if·this
2340 option·is·specified.·If·alternatives·in·the·pattern·exist,·they·are·tried.·If2340 option·is·specified.·If·alternatives·in·the·pattern·exist,·they·are·tried.·If
2341 all·the·alternatives·match·the·empty·string,·the·entire·match·fails.</p><p><em>Example:</em></p><p>If·the·following·pattern·is·applied·to·a·string·not·beginning·with·&quot;a&quot;·or·&quot;b&quot;,2341 all·the·alternatives·match·the·empty·string,·the·entire·match·fails.</p><p><em>Example:</em></p><p>If·the·following·pattern·is·applied·to·a·string·not·beginning·with·&quot;a&quot;·or·&quot;b&quot;,
2342 it·would·normally·match·the·empty·string·at·the·start·of·the·subject:</p><pre><code·class="text">a?b?</code></pre><p>With·option·<code·class="inline">notempty</code>,·this·match·is·invalid,·so·<a·href="#run/3"><code·class="inline">run/3</code></a>·searches2342 it·would·normally·match·the·empty·string·at·the·start·of·the·subject:</p><pre><code·class="text">a?b?</code></pre><p>With·option·<code·class="inline">notempty</code>,·this·match·is·invalid,·so·<a·href="#run/3"><code·class="inline">run/3</code></a>·searches
2343 further·into·the·string·for·occurrences·of·&quot;a&quot;·or·&quot;b&quot;.</p></li><li><p><strong><code·class="inline">notempty_atstart</code></strong>·-·Like·<code·class="inline">notempty</code>,·except·that·an·empty·string·match2343 further·into·the·string·for·occurrences·of·&quot;a&quot;·or·&quot;b&quot;.</p></li><li><p><strong><code·class="inline">notempty_atstart</code></strong>·-·Like·<code·class="inline">notempty</code>,·except·that·an·empty·string·match
2344 that·is·not·at·the·start·of·the·subject·is·permitted.·If·the·pattern·is2344 that·is·not·at·the·start·of·the·subject·is·permitted.·If·the·pattern·is
2345 anchored,·such·a·match·can·occur·only·if·the·pattern·contains·\K.</p><p>Perl·has·no·direct·equivalent·of·<code·class="inline">notempty</code>·or·<code·class="inline">notempty_atstart</code>,·but·it·does2345 anchored,·such·a·match·can·occur·only·if·the·pattern·contains·\K.</p><p>Perl·has·no·direct·equivalent·of·<code·class="inline">notempty</code>·or·<code·class="inline">notempty_atstart</code>,·but·it·does
2346 make·a·special·case·of·a·pattern·match·of·the·empty·string·within·its·split()2346 make·a·special·case·of·a·pattern·match·of·the·empty·string·within·its·split()
Offset 2403, 20 lines modifiedOffset 2403, 20 lines modified
2403 than·the·total·number·of·calls,·because·not·all·calls·to·match()·are2403 than·the·total·number·of·calls,·because·not·all·calls·to·match()·are
2404 recursive.·This·limit·is·of·use·only·if·it·is·set·smaller·than2404 recursive.·This·limit·is·of·use·only·if·it·is·set·smaller·than
2405 match_limit.</p><p>Limiting·the·recursion·depth·limits·the·amount·of·machine·stack·that2405 match_limit.</p><p>Limiting·the·recursion·depth·limits·the·amount·of·machine·stack·that
2406 can·be·used,·or,·when·PCRE·has·been·compiled·to·use·memory·on·the·heap2406 can·be·used,·or,·when·PCRE·has·been·compiled·to·use·memory·on·the·heap
2407 instead·of·the·stack,·the·amount·of·heap·memory·that·can·be·used.</p></blockquote><p>The·Erlang·VM·uses·a·PCRE·library·where·heap·memory·is·used·when·regular2407 instead·of·the·stack,·the·amount·of·heap·memory·that·can·be·used.</p></blockquote><p>The·Erlang·VM·uses·a·PCRE·library·where·heap·memory·is·used·when·regular
2408 expression·match·recursion·occurs.·This·therefore·limits·the·use·of·machine2408 expression·match·recursion·occurs.·This·therefore·limits·the·use·of·machine
2409 heap,·not·C·stack.</p><p>Specifying·a·lower·value·can·result·in·matches·with·deep·recursion·failing,2409 heap,·not·C·stack.</p><p>Specifying·a·lower·value·can·result·in·matches·with·deep·recursion·failing,
2410 when·they·should·have·matched:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="0893015978-1">(</span><span·class="s">&quot;aaaaaaaaaaaaaz&quot;</span><span·class="p">,</span><span·class="s">&quot;(a+)*z&quot;</span><span·class="p"·data-group-id="0893015978-1">)</span><span·class="p">.</span><span·class="w">2410 when·they·should·have·matched:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="1996948675-1">(</span><span·class="s">&quot;aaaaaaaaaaaaaz&quot;</span><span·class="p">,</span><span·class="s">&quot;(a+)*z&quot;</span><span·class="p"·data-group-id="1996948675-1">)</span><span·class="p">.</span><span·class="w">
2411 </span><span·class="p"·data-group-id="0893015978-2">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="0893015978-3">[</span><span·class="p"·data-group-id="0893015978-4">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">14</span>[·...·truncated·by·diffoscope;·len:·352,·SHA:·f53b96073f8261575c241d99fd2a834486da378242f09b0cf40ce3c78479ce0b·...·]-2">}</span><span·class="gp·unselectable">2411 </span><span·class="p"·data-group-id="1996948675-2">{</span><span·class="ss">match</span><span·class="p">,</span><span·class="p"·data-group-id="1996948675-3">[</span><span·class="p"·data-group-id="1996948675-4">{</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">14</span>[·...·truncated·by·diffoscope;·len:·352,·SHA:·4e1e5de760b72f07dee337cd5adde995adde2b88158522363f9e2cef400abdaf·...·]-2">}</span><span·class="gp·unselectable">
2412 2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="0893015978-6">(</span><span·class="s">&quot;aaaaaaaaaaaaaz&quot;</span><span·class="p">,</span><span·class="s">&quot;(a+)*z&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0893015978-7">[</span><span·class="p"·data-group-id="0893015978-8[·...·truncated·by·diffoscope;·len:·251,·SHA:·a32e824fa22402b52942fc9f7f044d507894c90bcf60e4615cf3453913490930·...·]-6">)</span><span·class="p">.</span><span·class="w">2412 2&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="1996948675-6">(</span><span·class="s">&quot;aaaaaaaaaaaaaz&quot;</span><span·class="p">,</span><span·class="s">&quot;(a+)*z&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1996948675-7">[</span><span·class="p"·data-group-id="1996948675-8[·...·truncated·by·diffoscope;·len:·251,·SHA:·d6d55639e31afe8c041a6c2aeef2c11cab75956fc8fcee5a421457ef70dbf523·...·]-6">)</span><span·class="p">.</span><span·class="w">
2413 </span><span·class="ss">nomatch</span><span·class="gp·unselectable">2413 </span><span·class="ss">nomatch</span><span·class="gp·unselectable">
2414 3&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="0893015978-9">(</span><span·class="s">&quot;aaaaaaaaaaaaaz&quot;</span><span·class="p">,</span><span·class="s">&quot;(a+)*z&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0893015978-10">[</span><span·class="p"·data-group-id="0893015978-[·...·truncated·by·diffoscope;·len:·316,·SHA:·b6ad88ff78c50b4d652fae387007b36a3c87ec755d33480bb863f7c8dcae762e·...·]-9">)</span><span·class="p">.</span><span·class="w">2414 3&gt;·</span><span·class="nc">re</span><span·class="p">:</span><span·class="nf">run</span><span·class="p"·data-group-id="1996948675-9">(</span><span·class="s">&quot;aaaaaaaaaaaaaz&quot;</span><span·class="p">,</span><span·class="s">&quot;(a+)*z&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1996948675-10">[</span><span·class="p"·data-group-id="1996948675-[·...·truncated·by·diffoscope;·len:·316,·SHA:·1949d2e58fda36decefc3074d8b29fd0700c158357f087da1ff1f13c7d86c579·...·]-9">)</span><span·class="p">.</span><span·class="w">
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141 ······<p·class="built-using">141 ······<p·class="built-using">
142 ········Built·using142 ········Built·using
143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
153 ····mermaid.initialize({153 ····mermaid.initialize({
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152 <p>The·following·functions·in·this·module·also·exist·and·provide·the·same152 <p>The·following·functions·in·this·module·also·exist·and·provide·the·same
153 functionality·in·the·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>·and·<a·href="ordsets.html"><code·class="inline">ordsets</code></a>·modules.·That·is,·by·only153 functionality·in·the·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>·and·<a·href="ordsets.html"><code·class="inline">ordsets</code></a>·modules.·That·is,·by·only
154 changing·the·module·name·for·each·call,·you·can·try·out·different·set154 changing·the·module·name·for·each·call,·you·can·try·out·different·set
155 representations.</p><ul><li><a·href="#add_element/2"><code·class="inline">add_element/2</code></a></li><li><a·href="#del_element/2"><code·class="inline">del_element/2</code></a></li><li><a·href="#filter/2"><code·class="inline">filter/2</code></a></li><li><a·href="#filtermap/2"><code·class="inline">filtermap/2</code></a></li><li><a·href="#fold/3"><code·class="inline">fold/3</code></a></li><li><a·href="#from_list/1"><code·class="inline">from_list/1</code></a></li><li><a·href="#intersection/1"><code·class="inline">intersection/1</code></a></li><li><a·href="#intersection/2"><code·class="inline">intersection/2</code></a></li><li><a·href="#is_element/2"><code·class="inline">is_element/2</code></a></li><li><a·href="#is_empty/1"><code·class="inline">is_empty/1</code></a></li><li><a·href="#is_equal/2"><code·class="inline">is_equal/2</code></a></li><li><a·href="#is_set/1"><code·class="inline">is_set/1</code></a></li><li><a·href="#is_subset/2"><code·class="inline">is_subset/2</code></a></li><li><a·href="#map/2"><code·class="inline">map/2</code></a></li><li><a·href="#new/0"><code·class="inline">new/0</code></a></li><li><a·href="#size/1"><code·class="inline">size/1</code></a></li><li><a·href="#subtract/2"><code·class="inline">subtract/2</code></a></li><li><a·href="#to_list/1"><code·class="inline">to_list/1</code></a></li><li><a·href="#union/1"><code·class="inline">union/1</code></a></li><li><a·href="#union/2"><code·class="inline">union/2</code></a></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>While·the·three·set·implementations·offer·the·same·<em>functionality</em>·with155 representations.</p><ul><li><a·href="#add_element/2"><code·class="inline">add_element/2</code></a></li><li><a·href="#del_element/2"><code·class="inline">del_element/2</code></a></li><li><a·href="#filter/2"><code·class="inline">filter/2</code></a></li><li><a·href="#filtermap/2"><code·class="inline">filtermap/2</code></a></li><li><a·href="#fold/3"><code·class="inline">fold/3</code></a></li><li><a·href="#from_list/1"><code·class="inline">from_list/1</code></a></li><li><a·href="#intersection/1"><code·class="inline">intersection/1</code></a></li><li><a·href="#intersection/2"><code·class="inline">intersection/2</code></a></li><li><a·href="#is_element/2"><code·class="inline">is_element/2</code></a></li><li><a·href="#is_empty/1"><code·class="inline">is_empty/1</code></a></li><li><a·href="#is_equal/2"><code·class="inline">is_equal/2</code></a></li><li><a·href="#is_set/1"><code·class="inline">is_set/1</code></a></li><li><a·href="#is_subset/2"><code·class="inline">is_subset/2</code></a></li><li><a·href="#map/2"><code·class="inline">map/2</code></a></li><li><a·href="#new/0"><code·class="inline">new/0</code></a></li><li><a·href="#size/1"><code·class="inline">size/1</code></a></li><li><a·href="#subtract/2"><code·class="inline">subtract/2</code></a></li><li><a·href="#to_list/1"><code·class="inline">to_list/1</code></a></li><li><a·href="#union/1"><code·class="inline">union/1</code></a></li><li><a·href="#union/2"><code·class="inline">union/2</code></a></li></ul><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>While·the·three·set·implementations·offer·the·same·<em>functionality</em>·with
156 respect·to·the·aforementioned·functions,·their·overall·<em>behavior</em>·may·differ.156 respect·to·the·aforementioned·functions,·their·overall·<em>behavior</em>·may·differ.
157 As·mentioned,·this·module·considers·elements·as·different·if·and·only·if·they157 As·mentioned,·this·module·considers·elements·as·different·if·and·only·if·they
158 do·not·match·(<code·class="inline">=:=</code>),·while·both·<a·href="ordsets.html"><code·class="inline">ordsets</code></a>·and·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>·consider·elements158 do·not·match·(<code·class="inline">=:=</code>),·while·both·<a·href="ordsets.html"><code·class="inline">ordsets</code></a>·and·<a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>·consider·elements
159 as·different·if·and·only·if·they·do·not·compare·equal·(<code·class="inline">==</code>).</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">is_element</span><span·class="p"·data-group-id="2557237316-1">(</span><span·class="mf">1.0</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="2557237316-2">(</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·204,·SHA:·b15af49e8ffd060d26b5cc2bfcb324bd8a5a1ad87be2c4b245aa62d64858166d·...·]-1">)</span><span·class="p">.</span><span·class="w">159 as·different·if·and·only·if·they·do·not·compare·equal·(<code·class="inline">==</code>).</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">is_element</span><span·class="p"·data-group-id="6941534105-1">(</span><span·class="mf">1.0</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">sets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="6941534105-2">(</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·204,·SHA:·5e4038c585cc1eadb00f2a340df505013889708e815da5b2722ea256efac0ab4·...·]-1">)</span><span·class="p">.</span><span·class="w">
160 </span><span·class="ss">false</span><span·class="gp·unselectable">160 </span><span·class="ss">false</span><span·class="gp·unselectable">
161 2&gt;·</span><span·class="nc">ordsets</span><span·class="p">:</span><span·class="nf">is_element</span><span·class="p"·data-group-id="2557237316-4">(</span><span·class="mf">1.0</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ordsets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="2557237316-5">(</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·207,·SHA:·4cc3500054d57b7f59b318a163c04d7944c7c6542225fab4392f28d5702a2e53·...·]-4">)</span><span·class="p">.</span><span·class="w">161 2&gt;·</span><span·class="nc">ordsets</span><span·class="p">:</span><span·class="nf">is_element</span><span·class="p"·data-group-id="6941534105-4">(</span><span·class="mf">1.0</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">ordsets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="6941534105-5">(</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·207,·SHA:·1ab478d913e77b63aeac132358eb3e7b752496c612430febac681ec111f9befe·...·]-4">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="ss">true</span><span·class="gp·unselectable">162 </span><span·class="ss">true</span><span·class="gp·unselectable">
163 2&gt;·</span><span·class="nc">gb_sets</span><span·class="p">:</span><span·class="nf">is_element</span><span·class="p"·data-group-id="2557237316-7">(</span><span·class="mf">1.0</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">gb_sets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="2557237316-8">(</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·207,·SHA:·68234bab25da8f93a532cdba644f9bb3ef3cb6b1ee7cc3d3d69c7120044dfbeb·...·]-7">)</span><span·class="p">.</span><span·class="w">163 2&gt;·</span><span·class="nc">gb_sets</span><span·class="p">:</span><span·class="nf">is_element</span><span·class="p"·data-group-id="6941534105-7">(</span><span·class="mf">1.0</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">gb_sets</span><span·class="p">:</span><span·class="nf">from_list</span><span·class="p"·data-group-id="6941534105-8">(</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·207,·SHA:·8f592724d668560d6d3c734aa9819bcb40ecdd899c510a15901294a5112be450·...·]-7">)</span><span·class="p">.</span><span·class="w">
164 </span><span·class="ss">true</span></code></pre></section><h2·id="module-see-also"·class="section-heading">164 </span><span·class="ss">true</span></code></pre></section><h2·id="module-see-also"·class="section-heading">
165 ··<a·href="#module-see-also"·class="hover-link">165 ··<a·href="#module-see-also"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">See·Also</span>168 ··<span·class="text">See·Also</span>
169 </h2>169 </h2>
170 <p><a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>,·<a·href="ordsets.html"><code·class="inline">ordsets</code></a></p>170 <p><a·href="gb_sets.html"><code·class="inline">gb_sets</code></a>,·<a·href="ordsets.html"><code·class="inline">ordsets</code></a></p>
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1172 ······<p·class="built-using">1172 ······<p·class="built-using">
1173 ········Built·using1173 ········Built·using
1174 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1174 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1175 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1175 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1176 ······</p>1176 ······</p>
1177 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1177 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1178 ····</footer>1178 ····</footer>
1179 ··</div>1179 ··</div>
1180 </main>1180 </main>
1181 </div>1181 </div>
1182 <script>1182 <script>
1183 ··function·mermaidLoaded()·{1183 ··function·mermaidLoaded()·{
1184 ····mermaid.initialize({1184 ····mermaid.initialize({
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162 used·by·the·compiler·are·unavailable·at·runtime.·So,·to·read·the·record·syntax162 used·by·the·compiler·are·unavailable·at·runtime.·So,·to·read·the·record·syntax
163 and·print·tuples·as·records·when·possible,·record·definitions·must·be·maintained163 and·print·tuples·as·records·when·possible,·record·definitions·must·be·maintained
164 by·the·shell·itself.</p><p>The·shell·commands·for·reading,·defining,·forgetting,·listing,·and·printing164 by·the·shell·itself.</p><p>The·shell·commands·for·reading,·defining,·forgetting,·listing,·and·printing
165 records·are·described·below.·Notice·that·each·job·has·its·own·set·of·record165 records·are·described·below.·Notice·that·each·job·has·its·own·set·of·record
166 definitions.·To·facilitate·matters,·record·definitions·in·modules166 definitions.·To·facilitate·matters,·record·definitions·in·modules
167 <code·class="inline">shell_default</code>·and·<code·class="inline">user_default</code>·(if·loaded)·are·read·each·time·a·new·job·is167 <code·class="inline">shell_default</code>·and·<code·class="inline">user_default</code>·(if·loaded)·are·read·each·time·a·new·job·is
168 started.·For·example,·adding·the·following·line·to·<code·class="inline">user_default</code>·makes·the168 started.·For·example,·adding·the·following·line·to·<code·class="inline">user_default</code>·makes·the
169 definition·of·<code·class="inline">file_info</code>·readily·available·in·the·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="4597698927-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="4597698927-1">)</span><span·class="p">.</span></code></pre><p>The·shell·runs·in·two·modes:</p><ul><li><code·class="inline">Normal·(possibly·restricted)</code>·mode,·in·which·commands·can·be·edited·and169 definition·of·<code·class="inline">file_info</code>·readily·available·in·the·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="9378882614-1">(</span><span·class="s">&quot;kernel/include/file.hrl&quot;</span><span·class="p"·data-group-id="9378882614-1">)</span><span·class="p">.</span></code></pre><p>The·shell·runs·in·two·modes:</p><ul><li><code·class="inline">Normal·(possibly·restricted)</code>·mode,·in·which·commands·can·be·edited·and
170 expressions·evaluated</li><li>Job·Control·Mode,·<code·class="inline">JCL</code>,·in·which·jobs·can·be·started,·killed,·detached,·and170 expressions·evaluated</li><li>Job·Control·Mode,·<code·class="inline">JCL</code>,·in·which·jobs·can·be·started,·killed,·detached,·and
171 connected</li></ul><p>Only·the·currently·connected·job·can·'talk'·to·the·shell.</p><h2·id="module-shell-commands"·class="section-heading">171 connected</li></ul><p>Only·the·currently·connected·job·can·'talk'·to·the·shell.</p><h2·id="module-shell-commands"·class="section-heading">
172 ··<a·href="#module-shell-commands"·class="hover-link">172 ··<a·href="#module-shell-commands"·class="hover-link">
173 ····<i·class="ri-link-m"·aria-hidden="true"></i>173 ····<i·class="ri-link-m"·aria-hidden="true"></i>
174 ··</a>174 ··</a>
175 ··<span·class="text">Shell·Commands</span>175 ··<span·class="text">Shell·Commands</span>
176 </h2>176 </h2>
Offset 230, 114 lines modifiedOffset 230, 114 lines modified
230 ··<a·href="#module-example"·class="hover-link">230 ··<a·href="#module-example"·class="hover-link">
231 ····<i·class="ri-link-m"·aria-hidden="true"></i>231 ····<i·class="ri-link-m"·aria-hidden="true"></i>
232 ··</a>232 ··</a>
233 ··<span·class="text">Example</span>233 ··<span·class="text">Example</span>
234 </h2>234 </h2>
235 <p>The·following·example·is·a·long·dialog·with·the·shell.·Commands·starting·with235 <p>The·following·example·is·a·long·dialog·with·the·shell.·Commands·starting·with
236 <code·class="inline">&gt;</code>·are·inputs·to·the·shell.·All·other·lines·are·output·from·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">strider</span><span·class="w">·</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">236 <code·class="inline">&gt;</code>·are·inputs·to·the·shell.·All·other·lines·are·output·from·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="ss">strider</span><span·class="w">·</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">
237 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="2862725381-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="2862725381-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·364,·SHA:·16ea5fc8192686bed0592ce98205d0a8aad89689db384b0f310995dc03c9a426·...·]-3">]</span><span·class="w">237 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="p"·data-group-id="3962664134-1">(</span><span·class="n">BEAM</span><span·class="p"·data-group-id="3962664134-1">)</span><span·class="w">·</span><span·class="ss">emulator</span><span·class="w">·</span><span·class="ss">version</span><span·class="w">·</span><span·class="mf">5.[·...·truncated·by·diffoscope;·len:·364,·SHA:·6c5ae5a282d6ec5d723ae9347b0131b6f15348b49b4c909b9f6f264716e6448d·...·]-3">]</span><span·class="w">
  
238 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="2862725381-4">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="2862725381-4">)</span><span·class="gp·unselectable">238 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3962664134-4">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="3962664134-4">)</span><span·class="gp·unselectable">
239 1&gt;·</span><span·class="n">Str</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;abcd&quot;</span><span·class="p">.</span><span·class="w">239 1&gt;·</span><span·class="n">Str</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;abcd&quot;</span><span·class="p">.</span><span·class="w">
240 </span><span·class="s">&quot;abcd&quot;</span></code></pre><p>Command·1·sets·variable·<code·class="inline">Str</code>·to·string·<code·class="inline">&quot;abcd&quot;</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">L</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">length</span><span·class="p"·data-group-id="2007477839-1">(</span><span·class="n">Str</span><span·class="p"·data-group-id="2007477839-1">)</span><span·class="p">.</span><span·class="w">240 </span><span·class="s">&quot;abcd&quot;</span></code></pre><p>Command·1·sets·variable·<code·class="inline">Str</code>·to·string·<code·class="inline">&quot;abcd&quot;</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="n">L</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">length</span><span·class="p"·data-group-id="1751655160-1">(</span><span·class="n">Str</span><span·class="p"·data-group-id="1751655160-1">)</span><span·class="p">.</span><span·class="w">
241 </span><span·class="mi">4</span></code></pre><p>Command·2·sets·<code·class="inline">L</code>·to·the·length·of·string·<code·class="inline">Str</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="n">Descriptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9014873139-1">{</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">list_to_atom</span><span·class="p"·data-group-id="9014873139-2">(</span><span·class="n">Str</span><span·class="p"·data-group-id="9014873139-2">)</span><span·class="p"·data-group-id="9014873139-1">}</span><span·class="p">.</span><span·class="w"> 
242 </span><span·class="p"·data-group-id="9014873139-3">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="9014873139-3">}</span></code></pre><p>Command·3·builds·the·tuple·<code·class="inline">Descriptor</code>,·eva[·...·truncated·by·diffoscope;·len:·15,·SHA:·0e7c15d0efd82a20bed5450963d958a2c7209265c55b1cf8553de8fc20daa29f·...·]241 </span><span·class="mi">4</span></code></pre><p>Command·2·sets·<code·class="inline">L</code>·to·the·length·of·string·<code·class="inline">Str</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="n">Descriptor</span[·...·truncated·by·diffoscope;·len:·459,·SHA:·4afa3251c6734ae3fc3a6b454f4d647932aaa641a20c4fe2a1135791198a2622·...·]
 242 </span><span·class="p"·data-group-id="1458306136-3">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="1458306136-3">}</span></code></pre><p>Command·3·builds·the·tuple·<code·class="inline">Descriptor</code>,·evaluating·the·BIF
243 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#list_to_atom/1"><code·class="inline">list_to_atom/1</code>·</a>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="n">L</span><span·class="p">.</span><span·class="w">243 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#list_to_atom/1"><code·class="inline">list_to_atom/1</code>·</a>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="n">L</span><span·class="p">.</span><span·class="w">
244 </span><span·class="mi">4</span></code></pre><p>Command·4·prints·the·value·of·variable·<code·class="inline">L</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nf">b</span><span·class="p"·data-group-id="8987313378-1">(</span><span·class="p"·data-group-id="8987313378-1">)</span><span·class="p">.</span><span·class="w">244 </span><span·class="mi">4</span></code></pre><p>Command·4·prints·the·value·of·variable·<code·class="inline">L</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nf">b</span><span·class="p"·data-group-id="8514048964-1">(</span><span·class="p"·data-group-id="8514048964-1">)</span><span·class="p">.</span><span·class="w">
245 </span><span·class="n">Descriptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8987313378-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="8987313378-2">}</span><span·class="w">245 </span><span·class="n">Descriptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="8514048964-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="8514048964-2">}</span><span·class="w">
246 </span><span·class="n">L</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">246 </span><span·class="n">L</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">4</span><span·class="w">
247 </span><span·class="n">Str</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;abcd&quot;</span><span·class="w">247 </span><span·class="n">Str</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;abcd&quot;</span><span·class="w">
248 </span><span·class="ss">ok</span></code></pre><p>Command·5·evaluates·the·internal·shell·command·<code·class="inline">b()</code>,·which·is·an·abbreviation248 </span><span·class="ss">ok</span></code></pre><p>Command·5·evaluates·the·internal·shell·command·<code·class="inline">b()</code>,·which·is·an·abbreviation
249 of·&quot;bindings&quot;.·This·prints·the·current·shell·variables·and·their·bindings.·<code·class="inline">ok</code>249 of·&quot;bindings&quot;.·This·prints·the·current·shell·variables·and·their·bindings.·<code·class="inline">ok</code>
250 at·the·end·is·the·return·value·of·function·<code·class="inline">b()</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="nf">f</span><span·class="p"·data-group-id="5546992770-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="5546992770-1">)</span><span·class="p">.</span><span·class="w">250 at·the·end·is·the·return·value·of·function·<code·class="inline">b()</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="nf">f</span><span·class="p"·data-group-id="2481651501-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="2481651501-1">)</span><span·class="p">.</span><span·class="w">
251 </span><span·class="ss">ok</span></code></pre><p>Command·6·evaluates·the·internal·shell·command·<code·class="inline">f(L)</code>·(abbreviation·of251 </span><span·class="ss">ok</span></code></pre><p>Command·6·evaluates·the·internal·shell·command·<code·class="inline">f(L)</code>·(abbreviation·of
252 &quot;forget&quot;).·The·value·of·variable·<code·class="inline">L</code>·is·removed.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="nf">b</span><span·class="p"·data-group-id="1643342910-1">(</span><span·class="p"·data-group-id="1643342910-1">)</span><span·class="p">.</span><span·class="w">252 &quot;forget&quot;).·The·value·of·variable·<code·class="inline">L</code>·is·removed.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="nf">b</span><span·class="p"·data-group-id="5111946950-1">(</span><span·class="p"·data-group-id="5111946950-1">)</span><span·class="p">.</span><span·class="w">
253 </span><span·class="n">Descriptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1643342910-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="1643342910-2">}</span><span·class="w">253 </span><span·class="n">Descriptor</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5111946950-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="5111946950-2">}</span><span·class="w">
254 </span><span·class="n">Str</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;abcd&quot;</span><span·class="w">254 </span><span·class="n">Str</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;abcd&quot;</span><span·class="w">
255 </span><span·class="ss">ok</span></code></pre><p>Command·7·prints·the·new·bindings.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="nf">f</span><span·class="p"·data-group-id="0042461754-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="0042461754-1">)</span><span·class="p">.</span><span·class="w">255 </span><span·class="ss">ok</span></code></pre><p>Command·7·prints·the·new·bindings.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">8&gt;·</span><span·class="nf">f</span><span·class="p"·data-group-id="6202950973-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="6202950973-1">)</span><span·class="p">.</span><span·class="w">
256 </span><span·class="ss">ok</span></code></pre><p>Command·8·has·no·effect,·as·<code·class="inline">L</code>·has·no·value.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">9&gt;·</span><span·class="p"·data-group-id="1225970673-1">{</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="1225970673-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">256 </span><span·class="ss">ok</span></code></pre><p>Command·8·has·no·effect,·as·<code·class="inline">L</code>·has·no·value.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">9&gt;·</span><span·class="p"·data-group-id="5138354451-1">{</span><span·class="n">L</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="5138354451-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">
257 </span><span·class="p"·data-group-id="1225970673-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="1225970673-2">}</span></code></pre><p>Command·9·performs·a·pattern·matching·operation·on·<code·class="inline">Descriptor</code>,·binding·a·new257 </span><span·class="p"·data-group-id="5138354451-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="5138354451-2">}</span></code></pre><p>Command·9·performs·a·pattern·matching·operation·on·<code·class="inline">Descriptor</code>,·binding·a·new
258 value·to·<code·class="inline">L</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">10&gt;·</span><span·class="n">L</span><span·class="p">.</span><span·class="w">258 value·to·<code·class="inline">L</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">10&gt;·</span><span·class="n">L</span><span·class="p">.</span><span·class="w">
259 </span><span·class="mi">4</span></code></pre><p>Command·10·prints·the·current·value·of·<code·class="inline">L</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">11&gt;·</span><span·class="p"·data-group-id="6225248350-1">{</span><span·class="n">P</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Q</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p"·data-group-id="6225248350-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">259 </span><span·class="mi">4</span></code></pre><p>Command·10·prints·the·current·value·of·<code·class="inline">L</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">11&gt;·</span><span·class="p"·data-group-id="7388099504-1">{</span><span·class="n">P</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Q</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p"·data-group-id="7388099504-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">
260 </span><span·class="gt">**·exception·error:·no·match·of·right·hand·side·value·{4,abcd}</span></code></pre><p>Command·11·tries·to·match·<code·class="inline">{P,·Q,·R}</code>·against·<code·class="inline">Descriptor</code>,·which·is·<code·class="inline">{4,·abc}</code>.260 </span><span·class="gt">**·exception·error:·no·match·of·right·hand·side·value·{4,abcd}</span></code></pre><p>Command·11·tries·to·match·<code·class="inline">{P,·Q,·R}</code>·against·<code·class="inline">Descriptor</code>,·which·is·<code·class="inline">{4,·abc}</code>.
261 The·match·fails·and·none·of·the·new·variables·become·bound.·The·printout261 The·match·fails·and·none·of·the·new·variables·become·bound.·The·printout
262 starting·with·&quot;<code·class="inline">**·exception·error:</code>&quot;·is·not·the·value·of·the·expression·(the262 starting·with·&quot;<code·class="inline">**·exception·error:</code>&quot;·is·not·the·value·of·the·expression·(the
263 expression·had·no·value·because·its·evaluation·failed),·but·a·warning·printed·by263 expression·had·no·value·because·its·evaluation·failed),·but·a·warning·printed·by
264 the·system·to·inform·the·user·that·an·error·has·occurred.·The·values·of·the264 the·system·to·inform·the·user·that·an·error·has·occurred.·The·values·of·the
265 other·variables·(<code·class="inline">L</code>,·<code·class="inline">Str</code>,·and·so·on)·are·unchanged.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">12&gt;·</span><span·class="n">P</span><span·class="p">.</span><span·class="w">265 other·variables·(<code·class="inline">L</code>,·<code·class="inline">Str</code>,·and·so·on)·are·unchanged.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">12&gt;·</span><span·class="n">P</span><span·class="p">.</span><span·class="w">
266 </span><span·class="gt">*·1:1:·variable·&#39;P&#39;·is·unbound</span><span·class="gp·unselectable">266 </span><span·class="gt">*·1:1:·variable·&#39;P&#39;·is·unbound</span><span·class="gp·unselectable">
267 13&gt;·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">267 13&gt;·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">
268 </span><span·class="p"·data-group-id="7187919574-1">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="7187919574-1">}</span></code></pre><p>Commands·12·and·13·show·that·<code·class="inline">P</code>·is·unbound·because·the·previous·command·failed,268 </span><span·class="p"·data-group-id="7619694802-1">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="7619694802-1">}</span></code></pre><p>Commands·12·and·13·show·that·<code·class="inline">P</code>·is·unbound·because·the·previous·command·failed,
269 and·that·<code·class="inline">Descriptor</code>·has·not·changed.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">14</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3721923134-1">{</span><span·class="n">P</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Q</span><span·class="p"·data-group-id="3721923134-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">269 and·that·<code·class="inline">Descriptor</code>·has·not·changed.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">14</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3076550259-1">{</span><span·class="n">P</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Q</span><span·class="p"·data-group-id="3076550259-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Descriptor</span><span·class="p">.</span><span·class="w">
270 </span><span·class="p"·data-group-id="3721923134-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="3721923134-2">}</span><span·class="gp·unselectable">270 </span><span·class="p"·data-group-id="3076550259-2">{</span><span·class="mi">4</span><span·class="p">,</span><span·class="ss">abcd</span><span·class="p"·data-group-id="3076550259-2">}</span><span·class="gp·unselectable">
271 15&gt;·</span><span·class="n">P</span><span·class="p">.</span><span·class="w">271 15&gt;·</span><span·class="n">P</span><span·class="p">.</span><span·class="w">
272 </span><span·class="mi">4</span></code></pre><p>Commands·14·and·15·show·a·correct·match·where·<code·class="inline">P</code>·and·<code·class="inline">Q</code>·are·bound.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">16&gt;·</span><span·class="nf">f</span><span·class="p"·data-group-id="5070047156-1">(</span><span·class="p"·data-group-id="5070047156-1">)</span><span·class="p">.</span><span·class="w">272 </span><span·class="mi">4</span></code></pre><p>Commands·14·and·15·show·a·correct·match·where·<code·class="inline">P</code>·and·<code·class="inline">Q</code>·are·bound.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">16&gt;·</span><span·class="nf">f</span><span·class="p"·data-group-id="5678028670-1">(</span><span·class="p"·data-group-id="5678028670-1">)</span><span·class="p">.</span><span·class="w">
273 </span><span·class="ss">ok</span></code></pre><p>Command·16·clears·all·bindings.</p><p>The·next·few·commands·assume·that·<code·class="inline">test1:demo(X)</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">demo</span><span·class="p"·data-group-id="6121777254-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="6121777254-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">273 </span><span·class="ss">ok</span></code></pre><p>Command·16·clears·all·bindings.</p><p>The·next·few·commands·assume·that·<code·class="inline">test1:demo(X)</code>·is·defined·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">demo</span><span·class="p"·data-group-id="0676200559-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="0676200559-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
274 </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="nf">put</span><span·class="p"·data-group-id="6121777254-2">(</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">worked</span><span·class="p"·data-group-id="6121777254-2">)</span><span·class="p">,</span><span·class="w">274 </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="nf">put</span><span·class="p"·data-group-id="0676200559-2">(</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">worked</span><span·class="p"·data-group-id="0676200559-2">)</span><span·class="p">,</span><span·class="w">
275 </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="n">X</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">275 </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="n">X</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
276 </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="n">X</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">17&gt;·</span><span·class="nf">put</span><span·class="p"·data-group-id="6736998997-1">(</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hello</span><span·class="p"·data-group-id="6736998997-1">)</span><span·class="p">.</span><span·class="w">276 </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="err"> </span><span·class="n">X</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">10</span><span·class="p">.</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">17&gt;·</span><span·class="nf">put</span><span·class="p"·data-group-id="7474475918-1">(</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hello</span><span·class="p"·data-group-id="7474475918-1">)</span><span·class="p">.</span><span·class="w">
277 </span><span·class="ss">undefined</span><span·class="gp·unselectable">277 </span><span·class="ss">undefined</span><span·class="gp·unselectable">
278 18&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="6736998997-2">(</span><span·class="ss">aa</span><span·class="p"·data-group-id="6736998997-2">)</span><span·class="p">.</span><span·class="w">278 18&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="7474475918-2">(</span><span·class="ss">aa</span><span·class="p"·data-group-id="7474475918-2">)</span><span·class="p">.</span><span·class="w">
279 </span><span·class="ss">hello</span></code></pre><p>Commands·17·and·18·set·and·inspect·the·value·of·item·<code·class="inline">aa</code>·in·the·process279 </span><span·class="ss">hello</span></code></pre><p>Commands·17·and·18·set·and·inspect·the·value·of·item·<code·class="inline">aa</code>·in·the·process
280 dictionary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">19&gt;·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">test1</span><span·class="p">:</span><span·class="nf">demo</span><span·class="p"·data-group-id="6310879330-1">(</span><span·class="mi">1</span><span·class="p"·data-group-id="6310879330-1">)</span><span·class="p">.</span><span·class="w">280 dictionary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">19&gt;·</span><span·class="n">Y</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">test1</span><span·class="p">:</span><span·class="nf">demo</span><span·class="p"·data-group-id="4630607824-1">(</span><span·class="mi">1</span><span·class="p"·data-group-id="4630607824-1">)</span><span·class="p">.</span><span·class="w">
281 </span><span·class="mi">11</span></code></pre><p>Command·19·evaluates·<code·class="inline">test1:demo(1)</code>.·The·evaluation·succeeds·and·the·changes281 </span><span·class="mi">11</span></code></pre><p>Command·19·evaluates·<code·class="inline">test1:demo(1)</code>.·The·evaluation·succeeds·and·the·changes
282 made·in·the·process·dictionary·become·visible·to·the·shell.·The·new·value·of282 made·in·the·process·dictionary·become·visible·to·the·shell.·The·new·value·of
283 dictionary·item·<code·class="inline">aa</code>·can·be·seen·in·command·20.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">20&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="8412470687-1">(</span><span·class="p"·data-group-id="8412470687-1">)</span><span·class="p">.</span><span·class="w">283 dictionary·item·<code·class="inline">aa</code>·can·be·seen·in·command·20.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">20&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="7586130610-1">(</span><span·class="p"·data-group-id="7586130610-1">)</span><span·class="p">.</span><span·class="w">
284 </span><span·class="p"·data-group-id="8412470687-2">[</span><span·class="p"·data-group-id="8412470687-3">{</span><span·class="ss">aa</span><span·class="p">,</span><span·class="ss">worked</span><span·class="p"·data-group-id="8412470687-3">}</span><span·class="p"·data-group-id="8412470687-2">]</span><span·class="gp·unselectable">284 </span><span·class="p"·data-group-id="7586130610-2">[</span><span·class="p"·data-group-id="7586130610-3">{</span><span·class="ss">aa</span><span·class="p">,</span><span·class="ss">worked</span><span·class="p"·data-group-id="7586130610-3">}</span><span·class="p"·data-group-id="7586130610-2">]</span><span·class="gp·unselectable">
285 21&gt;·</span><span·class="nf">put</span><span·class="p"·data-group-id="8412470687-4">(</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hello</span><span·class="p"·data-group-id="8412470687-4">)</span><span·class="p">.</span><span·class="w">285 21&gt;·</span><span·class="nf">put</span><span·class="p"·data-group-id="7586130610-4">(</span><span·class="ss">aa</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">hello</span><span·class="p"·data-group-id="7586130610-4">)</span><span·class="p">.</span><span·class="w">
286 </span><span·class="ss">worked</span><span·class="gp·unselectable">286 </span><span·class="ss">worked</span><span·class="gp·unselectable">
287 22&gt;·</span><span·class="n">Z</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">test1</span><span·class="p">:</span><span·class="nf">demo</span><span·class="p"·data-group-id="8412470687-5">(</span><span·class="mi">2</span><span·class="p"·data-group-id="8412470687-5">)</span><span·class="p">.</span><span·class="w">287 22&gt;·</span><span·class="n">Z</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">test1</span><span·class="p">:</span><span·class="nf">demo</span><span·class="p"·data-group-id="7586130610-5">(</span><span·class="mi">2</span><span·class="p"·data-group-id="7586130610-5">)</span><span·class="p">.</span><span·class="w">
288 </span><span·class="gt">**·exception·error:·no·match·of·right·hand·side·value·1288 </span><span·class="gt">**·exception·error:·no·match·of·right·hand·side·value·1
289 ·····in·function··test1:demo/1</span></code></pre><p>Commands·21·and·22·change·the·value·of·dictionary·item·<code·class="inline">aa</code>·to·<code·class="inline">hello</code>·and·call289 ·····in·function··test1:demo/1</span></code></pre><p>Commands·21·and·22·change·the·value·of·dictionary·item·<code·class="inline">aa</code>·to·<code·class="inline">hello</code>·and·call
290 <code·class="inline">test1:demo(2)</code>.·Evaluation·fails·and·the·changes·made·to·the·dictionary·in290 <code·class="inline">test1:demo(2)</code>.·Evaluation·fails·and·the·changes·made·to·the·dictionary·in
291 <code·class="inline">test1:demo(2)</code>,·before·the·error·occurred,·are·discarded.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">23&gt;·</span><span·class="n">Z</span><span·class="p">.</span><span·class="w">291 <code·class="inline">test1:demo(2)</code>,·before·the·error·occurred,·are·discarded.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">23&gt;·</span><span·class="n">Z</span><span·class="p">.</span><span·class="w">
292 </span><span·class="gt">*·1:1:·variable·&#39;Z&#39;·is·unbound</span><span·class="gp·unselectable">292 </span><span·class="gt">*·1:1:·variable·&#39;Z&#39;·is·unbound</span><span·class="gp·unselectable">
293 24&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="8763517172-1">(</span><span·class="ss">aa</span><span·class="p"·data-group-id="8763517172-1">)</span><span·class="p">.</span><span·class="w">293 24&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="8562652857-1">(</span><span·class="ss">aa</span><span·class="p"·data-group-id="8562652857-1">)</span><span·class="p">.</span><span·class="w">
294 </span><span·class="ss">hello</span></code></pre><p>Commands·23·and·24·show·that·<code·class="inline">Z</code>·was·not·bound·and·that·dictionary·item·<code·class="inline">aa</code>·has294 </span><span·class="ss">hello</span></code></pre><p>Commands·23·and·24·show·that·<code·class="inline">Z</code>·was·not·bound·and·that·dictionary·item·<code·class="inline">aa</code>·has
295 retained·its·original·value.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">25&gt;·</span><span·class="nf">erase</span><span·class="p"·data-group-id="1056721657-1">(</span><span·class="p"·data-group-id="1056721657-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">put</span><span·class="p"·data-group-id="1056721657-2">(</span><span·class="ss">aa</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·359fc5f685ee3236acf78f1aa28d2abf24eadee71ba08f67c2944855ea976061·...·]-2">)</span><span·class="p">.</span><span·class="w">295 retained·its·original·value.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">25&gt;·</span><span·class="nf">erase</span><span·class="p"·data-group-id="6840686295-1">(</span><span·class="p"·data-group-id="6840686295-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">put</span><span·class="p"·data-group-id="6840686295-2">(</span><span·class="ss">aa</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·0fe9b48b5c65e82762170595601dbca858d10c1c892ed65a2e4918365f845736·...·]-2">)</span><span·class="p">.</span><span·class="w">
296 </span><span·class="ss">undefined</span><span·class="gp·unselectable">296 </span><span·class="ss">undefined</span><span·class="gp·unselectable">
297 26&gt;·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1056721657-3">(</span><span·class="ss">test1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">demo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1056721657-4">[</span><span·class="mi">1</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·f753ca8621ac61cd24bc153bc254373b895c9cbb383449a0396e74bcc0a25bea·...·]-3">)</span><span·class="p">.</span><span·class="w">297 26&gt;·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="6840686295-3">(</span><span·class="ss">test1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">demo</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6840686295-4">[</span><span·class="mi">1</span><sp[·...·truncated·by·diffoscope;·len:·91,·SHA:·f2d5fc1102ba4dab07739fd3cbd6d53331e54d8915cfbd96486c95a53faa3f7b·...·]-3">)</span><span·class="p">.</span><span·class="w">
298 </span><span·class="o">&lt;</span><span·class="mf">0.57</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">298 </span><span·class="o">&lt;</span><span·class="mf">0.57</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
299 27&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="1056721657-5">(</span><span·class="ss">aa</span><span·class="p"·data-group-id="1056721657-5">)</span><span·class="p">.</span><span·class="w">299 27&gt;·</span><span·class="nf">get</span><span·class="p"·data-group-id="6840686295-5">(</span><span·class="ss">aa</span><span·class="p"·data-group-id="6840686295-5">)</span><span·class="p">.</span><span·class="w">
300 </span><span·class="ss">hello</span></code></pre><p>Commands·25,·26,·and·27·show·the·effect·of·evaluating·<code·class="inline">test1:demo(1)</code>·in·the300 </span><span·class="ss">hello</span></code></pre><p>Commands·25,·26,·and·27·show·the·effect·of·evaluating·<code·class="inline">test1:demo(1)</code>·in·the
301 background.·In·this·case,·the·expression·is·evaluated·in·a·newly·spawned301 background.·In·this·case,·the·expression·is·evaluated·in·a·newly·spawned
302 process.·Any·changes·made·in·the·process·dictionary·are·local·to·the·newly302 process.·Any·changes·made·in·the·process·dictionary·are·local·to·the·newly
303 spawned·process·and·therefore·not·visible·to·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">28&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9103713717-1">(</span><span·class="s">&quot;hello·hello\n&quot;</span><span·class="p"·data-group-id="9103713717-1">)</span><span·class="p">.</span><span·class="w">303 spawned·process·and·therefore·not·visible·to·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">28&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8758178621-1">(</span><span·class="s">&quot;hello·hello\n&quot;</span><span·class="p"·data-group-id="8758178621-1">)</span><span·class="p">.</span><span·class="w">
304 </span><span·class="ss">hello</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">304 </span><span·class="ss">hello</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">
305 </span><span·class="ss">ok</span><span·class="gp·unselectable">305 </span><span·class="ss">ok</span><span·class="gp·unselectable">
306 29&gt;·</span><span·class="nf">e</span><span·class="p"·data-group-id="9103713717-2">(</span><span·class="mi">28</span><span·class="p"·data-group-id="9103713717-2">)</span><span·class="p">.</span><span·class="w">306 29&gt;·</span><span·class="nf">e</span><span·class="p"·data-group-id="8758178621-2">(</span><span·class="mi">28</span><span·class="p"·data-group-id="8758178621-2">)</span><span·class="p">.</span><span·class="w">
307 </span><span·class="ss">hello</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">307 </span><span·class="ss">hello</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">
308 </span><span·class="ss">ok</span><span·class="gp·unselectable">308 </span><span·class="ss">ok</span><span·class="gp·unselectable">
309 30&gt;·</span><span·class="nf">v</span><span·class="p"·data-group-id="9103713717-3">(</span><span·class="mi">28</span><span·class="p"·data-group-id="9103713717-3">)</span><span·class="p">.</span><span·class="w">309 30&gt;·</span><span·class="nf">v</span><span·class="p"·data-group-id="8758178621-3">(</span><span·class="mi">28</span><span·class="p"·data-group-id="8758178621-3">)</span><span·class="p">.</span><span·class="w">
310 </span><span·class="ss">ok</span></code></pre><p>Commands·28,·29·and·30·use·the·history·facilities·of·the·shell.·Command·29310 </span><span·class="ss">ok</span></code></pre><p>Commands·28,·29·and·30·use·the·history·facilities·of·the·shell.·Command·29
311 re-evaluates·command·28.·Command·30·uses·the·value·(result)·of·command·28.·In311 re-evaluates·command·28.·Command·30·uses·the·value·(result)·of·command·28.·In
312 the·cases·of·a·pure·function·(a·function·with·no·side·effects),·the·result·is312 the·cases·of·a·pure·function·(a·function·with·no·side·effects),·the·result·is
313 the·same.·For·a·function·with·side·effects,·the·result·can·be·different.</p><p>The·next·few·commands·show·some·record·manipulation.·It·is·assumed·that·<code·class="inline">ex.erl</code>313 the·same.·For·a·function·with·side·effects,·the·result·can·be·different.</p><p>The·next·few·commands·show·some·record·manipulation.·It·is·assumed·that·<code·class="inline">ex.erl</code>
314 defines·a·record·as·follows:</p><p><code·class="inline">-record(rec,·{a,·b·=·val()}).</code></p><p><code·class="inline">val()·-&gt;</code><br/>    <code·class="inline">3.</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">31&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="0806378777-1">(</span><span·class="ss">ex</span><span·class="p"·data-group-id="0806378777-1">)</span><span·class="p">.</span><span·class="w">314 defines·a·record·as·follows:</p><p><code·class="inline">-record(rec,·{a,·b·=·val()}).</code></p><p><code·class="inline">val()·-&gt;</code><br/>    <code·class="inline">3.</code></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">31&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="4419789059-1">(</span><span·class="ss">ex</span><span·class="p"·data-group-id="4419789059-1">)</span><span·class="p">.</span><span·class="w">
315 </span><span·class="p"·data-group-id="0806378777-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">ex</span><span·class="p"·data-group-id="0806378777-2">}</span><span·class="gp·unselectable">315 </span><span·class="p"·data-group-id="4419789059-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">ex</span><span·class="p"·data-group-id="4419789059-2">}</span><span·class="gp·unselectable">
316 32&gt;·</span><span·class="nf">rr</span><span·class="p"·data-group-id="0806378777-3">(</span><span·class="ss">ex</span><span·class="p"·data-group-id="0806378777-3">)</span><span·class="p">.</span><span·class="w">316 32&gt;·</span><span·class="nf">rr</span><span·class="p"·data-group-id="4419789059-3">(</span><span·class="ss">ex</span><span·class="p"·data-group-id="4419789059-3">)</span><span·class="p">.</span><span·class="w">
317 </span><span·class="p"·data-group-id="0806378777-4">[</span><span·class="ss">rec</span><span·class="p"·data-group-id="0806378777-4">]</span></code></pre><p>Commands·31·and·32·compile·file·<code·class="inline">ex.erl</code>·and·read·the·record·definitions·in317 </span><span·class="p"·data-group-id="4419789059-4">[</span><span·class="ss">rec</span><span·class="p"·data-group-id="4419789059-4">]</span></code></pre><p>Commands·31·and·32·compile·file·<code·class="inline">ex.erl</code>·and·read·the·record·definitions·in
318 <code·class="inline">ex.beam</code>.·If·the·compiler·did·not·output·any·record·definitions·on·the·BEAM318 <code·class="inline">ex.beam</code>.·If·the·compiler·did·not·output·any·record·definitions·on·the·BEAM
319 file,·<code·class="inline">rr(ex)</code>·tries·to·read·record·definitions·from·the·source·file·instead.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">33&gt;·</span><span·class="nf">rl</span><span·class="p"·data-group-id="7775451463-1">(</span><span·class="ss">rec</span><span·class="p"·data-group-id="7775451463-1">)</span><span·class="p">.</span><span·class="w">319 file,·<code·class="inline">rr(ex)</code>·tries·to·read·record·definitions·from·the·source·file·instead.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">33&gt;·</span><span·class="nf">rl</span><span·class="p"·data-group-id="9681901696-1">(</span><span·class="ss">rec</span><span·class="p"·data-group-id="9681901696-1">)</span><span·class="p">.</span><span·class="w">
320 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="7775451463-2">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="p"·data-group-id="7775451463-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·243,·SHA:·82b46519e614d53c0852f7387a8c8c1f014df50c041ab5233cc3bfff6302a8c2·...·]-2">)</span><span·class="p">.</span><span·class="w">320 </span><span·class="p">-</span><span·class="na">record</span><span·class="p"·data-group-id="9681901696-2">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="p"·data-group-id="9681901696-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·cl[·...·truncated·by·diffoscope;·len:·243,·SHA:·58104854833f944123671f94b9d685f464dfe35bb93a904308fd1c98edcc2336·...·]-2">)</span><span·class="p">.</span><span·class="w">
321 </span><span·class="ss">ok</span></code></pre><p>Command·33·prints·the·definition·of·the·record·named·<code·class="inline">rec</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">34&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5832929606-1">{</span><span·class="p"·data-group-id="5832929606-1">}</span><span·class="p">.</span><span·class="w">321 </span><span·class="ss">ok</span></code></pre><p>Command·33·prints·the·definition·of·the·record·named·<code·class="inline">rec</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">34&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="3567705048-1">{</span><span·class="p"·data-group-id="3567705048-1">}</span><span·class="p">.</span><span·class="w">
322 </span><span·class="gt">**·exception·error:·undefined·shell·command·val/0</span></code></pre><p>Command·34·tries·to·create·a·<code·class="inline">rec</code>·record,·but·fails·as·function·<code·class="inline">val/0</code>·is322 </span><span·class="gt">**·exception·error:·undefined·shell·command·val/0</span></code></pre><p>Command·34·tries·to·create·a·<code·class="inline">rec</code>·record,·but·fails·as·function·<code·class="inline">val/0</code>·is
323 undefined.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">35&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="4974490247-1">{</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="4974490247-1">}</span><span·class="p">.</span><span·class="w">323 undefined.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">35&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="2360040171-1">{</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">3</span><span·class="p"·data-group-id="2360040171-1">}</span><span·class="p">.</span><span·class="w">
324 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="4974490247-2">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·83,·SHA:·9a1d486756e40208225dc18172853ef9c2fa0a5ad14f32367ebcc015be1d1276·...·]-2">}</span></code></pre><p>Command·35·shows·the·workaround:·explicitly·assign·values·to·record·fields·that324 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="2360040171-2">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·83,·SHA:·aef70643929094bebb93b10e241e1ebaed6bfffb70cae0cb55c0e83ac0633947·...·]-2">}</span></code></pre><p>Command·35·shows·the·workaround:·explicitly·assign·values·to·record·fields·that
325 cannot·otherwise·be·initialized.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">36&gt;·</span><span·class="nf">rp</span><span·class="p"·data-group-id="6384268506-1">(</span><span·class="nf">v</span><span·class="p"·data-group-id="6384268506-2">(</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="6384268506-2">)</span><span·class="p"·data-group-id="6384268506-1">)</span><span·class="p">.</span><span·class="w">325 cannot·otherwise·be·initialized.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">36&gt;·</span><span·class="nf">rp</span><span·class="p"·data-group-id="2714202894-1">(</span><span·class="nf">v</span><span·class="p"·data-group-id="2714202894-2">(</span><span·class="o">-</span><span·class="mi">1</span><span·class="p"·data-group-id="2714202894-2">)</span><span·class="p"·data-group-id="2714202894-1">)</span><span·class="p">.</span><span·class="w">
326 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="6384268506-3">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·83,·SHA:·d3b8aabc2f54334d60a9d7c6b73733ad4ba5dec7ccc5aced14062046448b0d8c·...·]-3">}</span><span·class="w">326 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="2714202894-3">{</span><span·class="ss">a</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="ss">b</span><span·class="w">·</span><span·class="o">=</span><span·c[·...·truncated·by·diffoscope;·len:·83,·SHA:·0774578196e379d944bf5d13f426a12bc0414d6fc5c14510efaa4fc479e20893·...·]-3">}</span><span·class="w">
327 </span><span·class="ss">ok</span></code></pre><p>Command·36·prints·the·newly·created·record·using·record·definitions·maintained327 </span><span·class="ss">ok</span></code></pre><p>Command·36·prints·the·newly·created·record·using·record·definitions·maintained
328 by·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">37&gt;·</span><span·class="nf">rd</span><span·class="p"·data-group-id="9463966585-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9463966585-2">{</span><span·class="ss">f</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·273,·SHA:·56a80e404979089f18a7bb56842bb56c88d58769cdca5ae99370e016e22bd5f6·...·]-1">)</span><span·class="p">.</span><span·class="w">328 by·the·shell.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">37&gt;·</span><span·class="nf">rd</span><span·class="p"·data-group-id="2464038463-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2464038463-2">{</span><span·class="ss">f</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·273,·SHA:·fba7d93413651c0ce7aa9604c1b5b65fe87c7e30b72269172cbb208d273366fd·...·]-1">)</span><span·class="p">.</span><span·class="w">
329 </span><span·class="ss">rec</span></code></pre><p>Command·37·defines·a·record·directly·in·the·shell.·The·definition·replaces·the329 </span><span·class="ss">rec</span></code></pre><p>Command·37·defines·a·record·directly·in·the·shell.·The·definition·replaces·the
330 one·read·from·file·<code·class="inline">ex.beam</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">38&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="0049334583-1">{</span><span·class="p"·data-group-id="0049334583-1">}</span><span·class="p">.</span><span·class="w">330 one·read·from·file·<code·class="inline">ex.beam</code>.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">38&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="0749693858-1">{</span><span·class="p"·data-group-id="0749693858-1">}</span><span·class="p">.</span><span·class="w">
331 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="0049334583-2">{</span><span·class="ss">f</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0049334583-3">[</span><span·class="p"·data-group-id="0049334583-3">]</span><span·class="p"·data-group-id="0049334583-2">}</span><span·class="w"> 
332 </span><span·class="ss">ok</span></code></pre><p>Command·38·creates·a·record·using·the·new·definition,·and·prints·the·result.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">39&gt;·</span><span·class="nf">rd</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·372,·SHA:·7221aad24332ea19f24901efb48fe33d4e5da540cf4a849665fa2c34c5d61414·...·]</span><span·class="w">331 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="0749693858-2">{</span><span·class="ss">f</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0749693858-3">[</span><span·class="p"[·...·truncated·by·diffoscope;·len:·84,·SHA:·be7c3e3931e0598661bb9c611ca47f0cdd73f04892cb1839ff4091759c6e96e2·...·]</span><span·class="w">
 332 </span><span·class="ss">ok</span></code></pre><p>Command·38·creates·a·record·using·the·new·definition,·and·prints·the·result.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">39&gt;·</span><span·class="nf">rd</span><span·class="p"·data-group-id="5192727456-1">(</span><span·class="ss">rec</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5192727456-2">{</span><span·class="ss">c</span><span·class="p"·data-group-id="5192727456-2">}</span><span·class="p"·data-group-id="5192727456-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">A</span><span·class="p">.</span><span·class="w">
333 </span><span·class="gt">*·1:15:·variable·&#39;A&#39;·is·unbound</span><span·class="gp·unselectable">333 </span><span·class="gt">*·1:15:·variable·&#39;A&#39;·is·unbound</span><span·class="gp·unselectable">
334 40&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="8452716815-3">{</span><span·class="p"·data-group-id="8452716815-3">}</span><span·class="p">.</span><span·class="w">334 40&gt;·</span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5192727456-3">{</span><span·class="p"·data-group-id="5192727456-3">}</span><span·class="p">.</span><span·class="w">
335 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="8452716815-4">{</span><span·class="ss">c</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="8452716815-4">}</span><span·class="w">335 </span><span·class="o">#</span><span·class="ss">rec</span><span·class="p"·data-group-id="5192727456-4">{</span><span·class="ss">c</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p"·data-group-id="5192727456-4">}</span><span·class="w">
336 </span><span·class="ss">ok</span></code></pre><p>Command·39·and·40·show·that·record·definitions·are·updated·as·side·effects.·The336 </span><span·class="ss">ok</span></code></pre><p>Command·39·and·40·show·that·record·definitions·are·updated·as·side·effects.·The
337 evaluation·of·the·command·fails,·but·the·definition·of·<code·class="inline">rec</code>·has·been·carried337 evaluation·of·the·command·fails,·but·the·definition·of·<code·class="inline">rec</code>·has·been·carried
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125 ····<small·class="app-vsn"·translate="no">(stdlib·v6.2.2)</small>125 ····<small·class="app-vsn"·translate="no">(stdlib·v6.2.2)</small>
  
126 ··</h1>126 ··</h1>
  
  
127 ····<section·id="moduledoc">127 ····<section·id="moduledoc">
128 <p>Customizing·the·Erlang·environment.</p><p>The·functions·in·this·module·are·called·when·no·module·name·is·specified·in·a128 <p>Customizing·the·Erlang·environment.</p><p>The·functions·in·this·module·are·called·when·no·module·name·is·specified·in·a
129 shell·command.</p><p>Consider·the·following·shell·dialog:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="5364646910-1">(</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="5364646910-1">)</span><span·class="p">.</span><span·class="w">129 shell·command.</p><p>Consider·the·following·shell·dialog:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">reverse</span><span·class="p"·data-group-id="1974186879-1">(</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="1974186879-1">)</span><span·class="p">.</span><span·class="w">
130 </span><span·class="s">&quot;cba&quot;</span><span·class="gp·unselectable">130 </span><span·class="s">&quot;cba&quot;</span><span·class="gp·unselectable">
131 2&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="5364646910-2">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="5364646910-2">)</span><span·class="p">.</span><span·class="w">131 2&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="1974186879-2">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="1974186879-2">)</span><span·class="p">.</span><span·class="w">
132 </span><span·class="p"·data-group-id="5364646910-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p"·data-group-id="5364646910-3">}</span></code></pre><p>In·command·one,·module·<a·href="lists.html"><code·class="inline">lists</code></a>·is·called.·In·command·two,·no·module·name·is132 </span><span·class="p"·data-group-id="1974186879-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p"·data-group-id="1974186879-3">}</span></code></pre><p>In·command·one,·module·<a·href="lists.html"><code·class="inline">lists</code></a>·is·called.·In·command·two,·no·module·name·is
133 specified.·The·shell·searches·module·<code·class="inline">user_default</code>·followed·by·module133 specified.·The·shell·searches·module·<code·class="inline">user_default</code>·followed·by·module
134 <code·class="inline">shell_default</code>·for·function·<code·class="inline">c/1</code>.</p><p><code·class="inline">shell_default</code>·is·intended·for·&quot;system·wide&quot;·customizations·to·the·shell.134 <code·class="inline">shell_default</code>·for·function·<code·class="inline">c/1</code>.</p><p><code·class="inline">shell_default</code>·is·intended·for·&quot;system·wide&quot;·customizations·to·the·shell.
135 <code·class="inline">user_default</code>·is·intended·for·&quot;local&quot;·or·individual·user·customizations.</p><h2·id="module-hint"·class="section-heading">135 <code·class="inline">user_default</code>·is·intended·for·&quot;local&quot;·or·individual·user·customizations.</p><h2·id="module-hint"·class="section-heading">
136 ··<a·href="#module-hint"·class="hover-link">136 ··<a·href="#module-hint"·class="hover-link">
137 ····<i·class="ri-link-m"·aria-hidden="true"></i>137 ····<i·class="ri-link-m"·aria-hidden="true"></i>
138 ··</a>138 ··</a>
139 ··<span·class="text">Hint</span>139 ··<span·class="text">Hint</span>
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232 ········Built·using232 ········Built·using
233 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the233 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
234 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>234 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
235 ······</p>235 ······</p>
236 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>236 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
237 ····</footer>237 ····</footer>
238 ··</div>238 ··</div>
239 </main>239 </main>
240 </div>240 </div>
241 <script>241 <script>
242 ··function·mermaidLoaded()·{242 ··function·mermaidLoaded()·{
243 ····mermaid.initialize({243 ····mermaid.initialize({
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1245 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1245 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1246 ······</p>1246 ······</p>
1247 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1247 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1248 ····</footer>1248 ····</footer>
1249 ··</div>1249 ··</div>
1250 </main>1250 </main>
1251 </div>1251 </div>
1252 <script>1252 <script>
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367 ······</div>367 ······</div>
  
368 <p>Starts·a·number·of·pseudo·servers.·A·pseudo·server·is·a·server·with·a·registered368 <p>Starts·a·number·of·pseudo·servers.·A·pseudo·server·is·a·server·with·a·registered
369 name·that·does·nothing·but·pass·on·all·message·to·the·real·server·that·executes369 name·that·does·nothing·but·pass·on·all·message·to·the·real·server·that·executes
370 at·a·master·node.·A·pseudo·server·is·an·intermediary·that·only·has·the·same370 at·a·master·node.·A·pseudo·server·is·an·intermediary·that·only·has·the·same
371 registered·name·as·the·real·server.</p><p>For·example,·if·you·have·started·a·slave·node·<code·class="inline">N</code>·and·want·to·execute·<code·class="inline">pxw</code>371 registered·name·as·the·real·server.</p><p>For·example,·if·you·have·started·a·slave·node·<code·class="inline">N</code>·and·want·to·execute·<code·class="inline">pxw</code>
372 graphics·code·on·this·node,·you·can·start·server·<code·class="inline">pxw_server</code>·as·a·pseudo·server372 graphics·code·on·this·node,·you·can·start·server·<code·class="inline">pxw_server</code>·as·a·pseudo·server
373 at·the·slave·node.·This·is·illustrated·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">rpc</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="5489091222-1">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">slave</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pseudo</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·462,·SHA:·938be29db7382890759c2bce672729ace48e448a50b61b61c1874c35ac418125·...·]-1">)</span><span·class="p">.</span></code></pre>373 at·the·slave·node.·This·is·illustrated·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">rpc</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9090075756-1">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">slave</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pseudo</span><span·class="p">,</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·462,·SHA:·1f01ed0506880eec696eb23dabefccc7b01733fe93cb2be44b5a1b6ddc6080eb·...·]-1">)</span><span·class="p">.</span></code></pre>
374 ··</section>374 ··</section>
375 </section>375 </section>
376 <section·class="detail"·id="relay/1">376 <section·class="detail"·id="relay/1">
  
377 ··<div·class="detail-header">377 ··<div·class="detail-header">
378 ····<a·href="#relay/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">378 ····<a·href="#relay/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
379 ······<i·class="ri-link-m"·aria-hidden="true"></i>379 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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513 as·fully·qualified·names;·short·names·can·also·be·used.·This·is·the·same513 as·fully·qualified·names;·short·names·can·also·be·used.·This·is·the·same
514 condition·that·applies·to·names·of·distributed·Erlang·nodes.</p><p>The·name·of·the·started·node·becomes·<code·class="inline">Name@Host</code>.</p><p>The·slave·node·resets·its·<a·href="io.html#t:user/0"><code·class="inline">io:user/0</code></a>·process·so·that·all·terminal·I/O·that·is514 condition·that·applies·to·names·of·distributed·Erlang·nodes.</p><p>The·name·of·the·started·node·becomes·<code·class="inline">Name@Host</code>.</p><p>The·slave·node·resets·its·<a·href="io.html#t:user/0"><code·class="inline">io:user/0</code></a>·process·so·that·all·terminal·I/O·that·is
515 produced·at·the·slave·is·automatically·relayed·to·the·master.·Also,·the·file515 produced·at·the·slave·is·automatically·relayed·to·the·master.·Also,·the·file
516 server·is·relayed·to·the·master.</p><p>Argument·<code·class="inline">Args</code>·is·used·to·set·<code·class="inline">erl</code>·command-line·arguments.·It·is516 server·is·relayed·to·the·master.</p><p>Argument·<code·class="inline">Args</code>·is·used·to·set·<code·class="inline">erl</code>·command-line·arguments.·It·is
517 passed·to·the·new·node·and·can·be·used·for·a·variety·of·purposes;·see517 passed·to·the·new·node·and·can·be·used·for·a·variety·of·purposes;·see
518 <a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html"><code·class="inline">erl(1)</code></a>.</p><p>As·an·example,·suppose·that·you·want·to·start·a·slave·node·at·host·<code·class="inline">H</code>·with·node518 <a·href="../../../../erts-15.2.6/doc/html/erl_cmd.html"><code·class="inline">erl(1)</code></a>.</p><p>As·an·example,·suppose·that·you·want·to·start·a·slave·node·at·host·<code·class="inline">H</code>·with·node
519 name·<code·class="inline">Name@H</code>·and·want·the·slave·node·to·have·the·following·properties:</p><ul><li>Directory·<code·class="inline">Dir</code>·is·to·be·added·to·the·code·path.</li><li>The·Mnesia·directory·is·to·be·set·to·<code·class="inline">M</code>.</li><li>The·Unix·<code·class="inline">DISPLAY</code>·environment·variable·is·to·be·set·to·the·display·of·the519 name·<code·class="inline">Name@H</code>·and·want·the·slave·node·to·have·the·following·properties:</p><ul><li>Directory·<code·class="inline">Dir</code>·is·to·be·added·to·the·code·path.</li><li>The·Mnesia·directory·is·to·be·set·to·<code·class="inline">M</code>.</li><li>The·Unix·<code·class="inline">DISPLAY</code>·environment·variable·is·to·be·set·to·the·display·of·the
520 master·node.</li></ul><p>The·following·code·is·executed·to·achieve·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;·-env·DISPLAY·&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nc">net_adm</span><span·class="p">:</span><span·class="nf">localhost</span><span·class="p"·data-group-id="6980569822-1">(</span><span·class="p"·data-group-id="6980569822-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;:0·&quot;</span><span·class="p">,</span><span·class="w">520 master·node.</li></ul><p>The·following·code·is·executed·to·achieve·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;·-env·DISPLAY·&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nc">net_adm</span><span·class="p">:</span><span·class="nf">localhost</span><span·class="p"·data-group-id="1016620737-1">(</span><span·class="p"·data-group-id="1016620737-1">)</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;:0·&quot;</span><span·class="p">,</span><span·class="w">
521 </span><span·class="n">Arg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;-mnesia_dir·&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;·-pa·&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">E</span><span·class="p">,</span><span·class="w">521 </span><span·class="n">Arg</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;-mnesia_dir·&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">M</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="s">&quot;·-pa·&quot;</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">Dir</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="n">E</span><span·class="p">,</span><span·class="w">
522 </span><span·class="nc">slave</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="6980569822-2">(</span><span·class="n">H</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arg</span><span·class="p"·data-group-id="6980569822-2">)</span><span·class="p">.</span></code></pre><p>The·function·returns·<code·class="inline">{ok,·Node}</code>,·where·<code·class="inline">Node</code>·is·the·name·of·the·new·node,522 </span><span·class="nc">slave</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1016620737-2">(</span><span·class="n">H</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Arg</span><span·class="p"·data-group-id="1016620737-2">)</span><span·class="p">.</span></code></pre><p>The·function·returns·<code·class="inline">{ok,·Node}</code>,·where·<code·class="inline">Node</code>·is·the·name·of·the·new·node,
523 otherwise·<code·class="inline">{error,·Reason}</code>,·where·<code·class="inline">Reason</code>·can·be·one·of:</p><ul><li><p><strong><code·class="inline">timeout</code></strong>·-·The·master·node·failed·to·get·in·contact·with·the·slave·node.523 otherwise·<code·class="inline">{error,·Reason}</code>,·where·<code·class="inline">Reason</code>·can·be·one·of:</p><ul><li><p><strong><code·class="inline">timeout</code></strong>·-·The·master·node·failed·to·get·in·contact·with·the·slave·node.
524 This·can·occur·in·a·number·of·circumstances:</p><ul><li>Erlang/OTP·is·not·installed·on·the·remote·host.</li><li>The·file·system·on·the·other·host·has·a·different·structure·to·the·the524 This·can·occur·in·a·number·of·circumstances:</p><ul><li>Erlang/OTP·is·not·installed·on·the·remote·host.</li><li>The·file·system·on·the·other·host·has·a·different·structure·to·the·the
525 master.</li><li>The·Erlang·nodes·have·different·cookies.</li></ul></li><li><p><strong><code·class="inline">no_rsh</code></strong>·-·No·remote·shell·program·was·found·on·the·computer.·Note·that525 master.</li><li>The·Erlang·nodes·have·different·cookies.</li></ul></li><li><p><strong><code·class="inline">no_rsh</code></strong>·-·No·remote·shell·program·was·found·on·the·computer.·Note·that
526 <code·class="inline">ssh</code>·is·used·by·default,·but·this·can·be·overridden·with·the·<code·class="inline">-rsh</code>·flag.</p></li><li><p><strong><code·class="inline">{already_running,·Node}</code></strong>·-·A·node·with·name·<code·class="inline">Name@Host</code>·already·exists.</p></li></ul>526 <code·class="inline">ssh</code>·is·used·by·default,·but·this·can·be·overridden·with·the·<code·class="inline">-rsh</code>·flag.</p></li><li><p><strong><code·class="inline">{already_running,·Node}</code></strong>·-·A·node·with·name·<code·class="inline">Name@Host</code>·already·exists.</p></li></ul>
527 ··</section>527 ··</section>
528 </section>528 </section>
529 <section·class="detail"·id="start_link/1">529 <section·class="detail"·id="start_link/1">
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687 ········Built·using687 ········Built·using
688 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the688 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
689 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>689 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
690 ······</p>690 ······</p>
691 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>691 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
692 ····</footer>692 ····</footer>
693 ··</div>693 ··</div>
694 </main>694 </main>
695 </div>695 </div>
696 <script>696 <script>
697 ··function·mermaidLoaded()·{697 ··function·mermaidLoaded()·{
698 ····mermaid.initialize({698 ····mermaid.initialize({
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157 string·and·returns·a·formatted·expressions·as·a·string.·See157 string·and·returns·a·formatted·expressions·as·a·string.·See
158 <a·href="shell.html#format_shell_func/1"><code·class="inline">shell:format_shell_func/1</code></a>·for·how·to·set·it·from·inside·the·shell.</p><p>If·instead·a·string·is·provided,·it·will·be·used·as·a·shell·command.·Your158 <a·href="shell.html#format_shell_func/1"><code·class="inline">shell:format_shell_func/1</code></a>·for·how·to·set·it·from·inside·the·shell.</p><p>If·instead·a·string·is·provided,·it·will·be·used·as·a·shell·command.·Your
159 command·must·include·<code·class="inline">${file}</code>·somewhere·in·the·string,·for·the·shell·to·know159 command·must·include·<code·class="inline">${file}</code>·somewhere·in·the·string,·for·the·shell·to·know
160 where·the·file·goes·in·the·command.</p><pre><code·class="text">-stdlib·format_shell_func·&quot;\&quot;emacs·-batch·\${file}·-l·~/erlang-format/emacs-format-file·-f·emacs-format-function\&quot;&quot;</code></pre><pre><code·class="text">-stdlib·format_shell_func·&quot;{shell,·erl_pp_format_func}&quot;</code></pre></li><li><p><strong><code·class="inline"·id="shell_prompt_func">shell_prompt_func·=·{Mod,·Func}·|·default</code></strong>·-·where</p><ul><li><code·class="inline">Mod·=·atom()</code></li><li><code·class="inline">Func·=·atom()</code></li></ul><p>Can·be·used·to·set·a·customized·Erlang·shell·prompt·function.</p></li><li><p><strong><code·class="inline"·id="shell_multiline_prompt">shell_multiline_prompt·=·{Mod,·Func}·|·string()·|·default</code></strong>·-·where</p><ul><li><code·class="inline">Mod·=·atom()</code></li><li><code·class="inline">Func·=·atom()</code></li></ul><p>Can·be·used·to·set·a·customized·multiline·shell·prompt·function.·The·multiline160 where·the·file·goes·in·the·command.</p><pre><code·class="text">-stdlib·format_shell_func·&quot;\&quot;emacs·-batch·\${file}·-l·~/erlang-format/emacs-format-file·-f·emacs-format-function\&quot;&quot;</code></pre><pre><code·class="text">-stdlib·format_shell_func·&quot;{shell,·erl_pp_format_func}&quot;</code></pre></li><li><p><strong><code·class="inline"·id="shell_prompt_func">shell_prompt_func·=·{Mod,·Func}·|·default</code></strong>·-·where</p><ul><li><code·class="inline">Mod·=·atom()</code></li><li><code·class="inline">Func·=·atom()</code></li></ul><p>Can·be·used·to·set·a·customized·Erlang·shell·prompt·function.</p></li><li><p><strong><code·class="inline"·id="shell_multiline_prompt">shell_multiline_prompt·=·{Mod,·Func}·|·string()·|·default</code></strong>·-·where</p><ul><li><code·class="inline">Mod·=·atom()</code></li><li><code·class="inline">Func·=·atom()</code></li></ul><p>Can·be·used·to·set·a·customized·multiline·shell·prompt·function.·The·multiline
161 prompt·function·takes·the·main·prompt·as·its·only·parameter.</p></li><li><p><strong><code·class="inline"·id="shell_saved_results">shell_saved_results·=·integer()·&gt;=·0</code></strong>·-·Can·be161 prompt·function·takes·the·main·prompt·as·its·only·parameter.</p></li><li><p><strong><code·class="inline"·id="shell_saved_results">shell_saved_results·=·integer()·&gt;=·0</code></strong>·-·Can·be
162 used·to·determine·how·many·results·are·saved·by·the·Erlang·shell.</p></li><li><p><strong><code·class="inline"·id="shell_session_slogan">shell_session_slogan·=·string()·|·fun()·-&gt;·string())</code></strong>·-·The·slogan·printed·when·starting·an·Erlang·shell.162 used·to·determine·how·many·results·are·saved·by·the·Erlang·shell.</p></li><li><p><strong><code·class="inline"·id="shell_session_slogan">shell_session_slogan·=·string()·|·fun()·-&gt;·string())</code></strong>·-·The·slogan·printed·when·starting·an·Erlang·shell.
163 Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">stdlib</span><span·class="w">·</span><span·class="ss">shell_session_slogan</span><span·class="w">·</span><span·class="ss">&#39;&quot;Test·slogan&quot;&#39;</span><span·class="w">163 Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">stdlib</span><span·class="w">·</span><span·class="ss">shell_session_slogan</span><span·class="w">·</span><span·class="ss">&#39;&quot;Test·slogan&quot;&#39;</span><span·class="w">
164 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="p"·data-group-id="5031308481-1">[</span><span·class="n">DEVELOPMENT</span><span·class="p"·data-group-id="5031308481-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="5031308481-2">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">1[·...·truncated·by·diffoscope;·len:·1496,·SHA:·2e84918d71d3a55cfdc098b3975addea8fa3c631ef32f711c0ce841081a896be·...·]-8">]</span><span·class="w">164 </span><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">26</span><span·class="w">·</span><span·class="p"·data-group-id="4530292063-1">[</span><span·class="n">DEVELOPMENT</span><span·class="p"·data-group-id="4530292063-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="4530292063-2">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">1[·...·truncated·by·diffoscope;·len:·1496,·SHA:·d8942ff13c8e6b273ab529a21544061365e84d4c2d462ece6cebdef3428c148f·...·]-8">]</span><span·class="w">
  
165 </span><span·class="n">Test</span><span·class="w">·</span><span·class="ss">slogan</span><span·class="w">165 </span><span·class="n">Test</span><span·class="w">·</span><span·class="ss">slogan</span><span·class="w">
166 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre></li><li><p><strong><code·class="inline"·id="shell_slogan">shell_slogan·=·string()·|·fun(()·-&gt;·string())</code></strong>·-·The166 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre></li><li><p><strong><code·class="inline"·id="shell_slogan">shell_slogan·=·string()·|·fun(()·-&gt;·string())</code></strong>·-·The
167 slogan·printed·when·starting·the·Erlang·shell·subsystem.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">stdlib</span><span·class="w">·</span><span·class="ss">shell_slogan</span><span·class="w">·</span><span·class="ss">&#39;&quot;Test·slogan&quot;&#39;</span><span·class="w">167 slogan·printed·when·starting·the·Erlang·shell·subsystem.·Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">-</span><span·class="ss">stdlib</span><span·class="w">·</span><span·class="ss">shell_slogan</span><span·class="w">·</span><span·class="ss">&#39;&quot;Test·slogan&quot;&#39;</span><span·class="w">
168 </span><span·class="n">Test</span><span·class="w">·</span><span·class="ss">slogan</span><span·class="w">168 </span><span·class="n">Test</span><span·class="w">·</span><span·class="ss">slogan</span><span·class="w">
169 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V13</span><span·class="p">.</span><span·class="mf">0.2</span><span·class="w">··</span><span·class="p"·data-group-id="2035963101-1">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="2035963101-1">)</span><span·class="w">169 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V13</span><span·class="p">.</span><span·class="mf">0.2</span><span·class="w">··</span><span·class="p"·data-group-id="7584921144-1">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7584921144-1">)</span><span·class="w">
170 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre><p>The·default·is·the·return·value·of170 </span><span·class="mi">1</span><span·class="o">&gt;</span></code></pre><p>The·default·is·the·return·value·of
171 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#system_info_system_version"><code·class="inline">erlang:system_info(system_version)</code></a>.</p></li><li><p><strong><code·class="inline"·id="shell_strings">shell_strings·=·boolean()</code></strong>·-·Can·be·used·to·determine171 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#system_info_system_version"><code·class="inline">erlang:system_info(system_version)</code></a>.</p></li><li><p><strong><code·class="inline"·id="shell_strings">shell_strings·=·boolean()</code></strong>·-·Can·be·used·to·determine
172 how·the·Erlang·shell·outputs·lists·of·integers.</p></li></ul><h2·id="see-also"·class="section-heading">172 how·the·Erlang·shell·outputs·lists·of·integers.</p></li></ul><h2·id="see-also"·class="section-heading">
173 ··<a·href="#see-also"·class="hover-link">173 ··<a·href="#see-also"·class="hover-link">
174 ····<i·class="ri-link-m"·aria-hidden="true"></i>174 ····<i·class="ri-link-m"·aria-hidden="true"></i>
175 ··</a>175 ··</a>
176 ··<span·class="text">See·Also</span>176 ··<span·class="text">See·Also</span>
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223 ······<p·class="built-using">223 ······<p·class="built-using">
224 ········Built·using224 ········Built·using
225 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the225 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
226 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>226 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
227 ······</p>227 ······</p>
228 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>228 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
229 ····</footer>229 ····</footer>
230 ··</div>230 ··</div>
231 </main>231 </main>
232 </div>232 </div>
233 <script>233 <script>
234 ··function·mermaidLoaded()·{234 ··function·mermaidLoaded()·{
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145 <a·href="#replace/3"><code·class="inline">replace/3</code></a>,·<a·href="#split/2"><code·class="inline">split/2</code></a>,·<a·href="#split/3"><code·class="inline">split/3</code></a>·and·<a·href="#trim/3"><code·class="inline">trim/3</code></a>.</p><p>Splitting·and·appending·strings·is·to·be·done·on·grapheme·clusters·borders.145 <a·href="#replace/3"><code·class="inline">replace/3</code></a>,·<a·href="#split/2"><code·class="inline">split/2</code></a>,·<a·href="#split/3"><code·class="inline">split/3</code></a>·and·<a·href="#trim/3"><code·class="inline">trim/3</code></a>.</p><p>Splitting·and·appending·strings·is·to·be·done·on·grapheme·clusters·borders.
146 There·is·no·verification·that·the·results·of·appending·strings·are·valid·or146 There·is·no·verification·that·the·results·of·appending·strings·are·valid·or
147 normalized.</p><p>Most·of·the·functions·expect·all·input·to·be·normalized·to·one·form,·see·for147 normalized.</p><p>Most·of·the·functions·expect·all·input·to·be·normalized·to·one·form,·see·for
148 example·<a·href="unicode.html#characters_to_nfc_list/1"><code·class="inline">unicode:characters_to_nfc_list/1</code></a>.</p><p>Language·or·locale·specific·handling·of·input·is·not·considered·in·any·function.</p><p>The·functions·can·crash·for·non-valid·input·strings.·For·example,·the·functions148 example·<a·href="unicode.html#characters_to_nfc_list/1"><code·class="inline">unicode:characters_to_nfc_list/1</code></a>.</p><p>Language·or·locale·specific·handling·of·input·is·not·considered·in·any·function.</p><p>The·functions·can·crash·for·non-valid·input·strings.·For·example,·the·functions
149 expect·UTF-8·binaries·but·not·all·functions·verify·that·all·binaries·are·encoded149 expect·UTF-8·binaries·but·not·all·functions·verify·that·all·binaries·are·encoded
150 correctly.</p><p>Unless·otherwise·specified·the·return·value·type·is·the·same·as·the·input·type.150 correctly.</p><p>Unless·otherwise·specified·the·return·value·type·is·the·same·as·the·input·type.
151 That·is,·binary·input·returns·binary·output,·list·input·returns·a·list·output,151 That·is,·binary·input·returns·binary·output,·list·input·returns·a·list·output,
152 and·mixed·input·can·return·a·mixed·output.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">trim</span><span·class="p"·data-group-id="6809914916-1">(</span><span·class="s">&quot;··sarah··&quot;</span><span·class="p"·data-group-id="6809914916-1">)</span><span·class="p">.</span><span·class="w">152 and·mixed·input·can·return·a·mixed·output.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">trim</span><span·class="p"·data-group-id="4819097901-1">(</span><span·class="s">&quot;··sarah··&quot;</span><span·class="p"·data-group-id="4819097901-1">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="s">&quot;sarah&quot;</span><span·class="gp·unselectable">153 </span><span·class="s">&quot;sarah&quot;</span><span·class="gp·unselectable">
154 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">trim</span><span·class="p"·data-group-id="6809914916-2">(</span><span·class="p"·data-group-id="6809914916-3">&lt;&lt;</span><span·class="s">&quot;··sarah··&quot;</span><span·class="p"·data-group-id="6809914916-3">&gt;&gt;</span><span·class="p"·data-group-id="6809914916-2">)</span><span·class="p">.</span><span·class="w">154 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">trim</span><span·class="p"·data-group-id="4819097901-2">(</span><span·class="p"·data-group-id="4819097901-3">&lt;&lt;</span><span·class="s">&quot;··sarah··&quot;</span><span·class="p"·data-group-id="4819097901-3">&gt;&gt;</span><span·class="p"·data-group-id="4819097901-2">)</span><span·class="p">.</span><span·class="w">
155 </span><span·class="p"·data-group-id="6809914916-4">&lt;&lt;</span><span·class="s">&quot;sarah&quot;</span><span·class="p"·data-group-id="6809914916-4">&gt;&gt;</span><span·class="gp·unselectable">155 </span><span·class="p"·data-group-id="4819097901-4">&lt;&lt;</span><span·class="s">&quot;sarah&quot;</span><span·class="p"·data-group-id="4819097901-4">&gt;&gt;</span><span·class="gp·unselectable">
156 3&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">lexemes</span><span·class="p"·data-group-id="6809914916-5">(</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;·&quot;</span><span·class="p"·data-group-id="6809914916-5">)</span><span·class="p">.</span><span·class="w">156 3&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">lexemes</span><span·class="p"·data-group-id="4819097901-5">(</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;·&quot;</span><span·class="p"·data-group-id="4819097901-5">)</span><span·class="p">.</span><span·class="w">
157 </span><span·class="p"·data-group-id="6809914916-6">[</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="6809914916-6">]</span><span·class="gp·unselectable">157 </span><span·class="p"·data-group-id="4819097901-6">[</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="4819097901-6">]</span><span·class="gp·unselectable">
158 4&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">lexemes</span><span·class="p"·data-group-id="6809914916-7">(</span><span·class="p"·data-group-id="6809914916-8">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="6809914916-8">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;·&[·...·truncated·by·diffoscope;·len:·53,·SHA:·4617e460c3aa6731f5ce5768f0be8b1e18f8e6e766a2a236c0110d5830e444b1·...·]-7">)</span><span·class="p">.</span><span·class="w">158 4&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">lexemes</span><span·class="p"·data-group-id="4819097901-7">(</span><span·class="p"·data-group-id="4819097901-8">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="4819097901-8">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;·&[·...·truncated·by·diffoscope;·len:·53,·SHA:·b4082a432ee6974f2d64e0b8d679cea3510c4ac39371f1c6463a4787b0b42c20·...·]-7">)</span><span·class="p">.</span><span·class="w">
159 </span><span·class="p"·data-group-id="6809914916-9">[</span><span·class="p"·data-group-id="6809914916-10">&lt;&lt;</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="6809914916-10">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="6809914916-11">&lt;[·...·truncated·by·diffoscope;·len:·151,·SHA:·47385007fc759d75f5f4d28ec66210e758db88016ece9c46ce3793d2637c891e·...·]-9">]</span></code></pre><p>This·module·has·been·reworked·in·Erlang/OTP·20·to·handle·<a·href="unicode.html#t:chardata/0"><code·class="inline">unicode:chardata/0</code></a>159 </span><span·class="p"·data-group-id="4819097901-9">[</span><span·class="p"·data-group-id="4819097901-10">&lt;&lt;</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="4819097901-10">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="4819097901-11">&lt;[·...·truncated·by·diffoscope;·len:·151,·SHA:·2494479b5736b851eabc9dbda8d00dc918a5829d4f3b73a59e25c6a58c1761f5·...·]-9">]</span></code></pre><p>This·module·has·been·reworked·in·Erlang/OTP·20·to·handle·<a·href="unicode.html#t:chardata/0"><code·class="inline">unicode:chardata/0</code></a>
160 and·operate·on·grapheme·clusters.·The160 and·operate·on·grapheme·clusters.·The
161 <a·href="string.html#obsolete-api-functions"><code·class="inline">old·functions</code></a>·that·only·work·on·Latin-1161 <a·href="string.html#obsolete-api-functions"><code·class="inline">old·functions</code></a>·that·only·work·on·Latin-1
162 lists·as·input·are·still·available·but·should·not·be·used,·they·will·be162 lists·as·input·are·still·available·but·should·not·be·used,·they·will·be
163 deprecated·in·a·future·release.</p><h2·id="module-notes"·class="section-heading">163 deprecated·in·a·future·release.</p><h2·id="module-notes"·class="section-heading">
164 ··<a·href="#module-notes"·class="hover-link">164 ··<a·href="#module-notes"·class="hover-link">
165 ····<i·class="ri-link-m"·aria-hidden="true"></i>165 ····<i·class="ri-link-m"·aria-hidden="true"></i>
166 ··</a>166 ··</a>
Offset 1062, 15 lines modifiedOffset 1062, 15 lines modified
  
1062 ··········<pre·translate="no"><span·class="attribute">-spec</span>·casefold(String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>())·->·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>().</pre>1062 ··········<pre·translate="no"><span·class="attribute">-spec</span>·casefold(String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>())·->·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>().</pre>
  
1063 ······</div>1063 ······</div>
  
1064 <p>Converts·<code·class="inline">String</code>·to·a·case-agnostic·comparable·string.·Function1064 <p>Converts·<code·class="inline">String</code>·to·a·case-agnostic·comparable·string.·Function
1065 <a·href="#casefold/1"><code·class="inline">casefold/1</code></a>·is·preferred·over·<a·href="#lowercase/1"><code·class="inline">lowercase/1</code></a>1065 <a·href="#casefold/1"><code·class="inline">casefold/1</code></a>·is·preferred·over·<a·href="#lowercase/1"><code·class="inline">lowercase/1</code></a>
1066 when·two·strings·are·to·be·compared·for·equality.·See·also·<a·href="#equal/4"><code·class="inline">equal/4</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">casefold</span><span·class="p"·data-group-id="3510381824-1">(</span><span·class="s">&quot;Ω·and··SHARP·S&quot;</span><span·class="p"·data-group-id="3510381824-1">)</span><span·class="p">.</span><span·class="w">1066 when·two·strings·are·to·be·compared·for·equality.·See·also·<a·href="#equal/4"><code·class="inline">equal/4</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">casefold</span><span·class="p"·data-group-id="7936702420-1">(</span><span·class="s">&quot;Ω·and··SHARP·S&quot;</span><span·class="p"·data-group-id="7936702420-1">)</span><span·class="p">.</span><span·class="w">
1067 </span><span·class="s">&quot;ω·and·ss·sharp·s&quot;</span></code></pre>1067 </span><span·class="s">&quot;ω·and·ss·sharp·s&quot;</span></code></pre>
1068 ··</section>1068 ··</section>
1069 </section>1069 </section>
1070 <section·class="detail"·id="chomp/1">1070 <section·class="detail"·id="chomp/1">
  
1071 ··<div·class="detail-header">1071 ··<div·class="detail-header">
1072 ····<a·href="#chomp/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1072 ····<a·href="#chomp/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1092, 17 lines modifiedOffset 1092, 17 lines modified
1092 ······<div·class="specs">1092 ······<div·class="specs">
  
1093 ··········<pre·translate="no"><span·class="attribute">-spec</span>·chomp(String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>())·->·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>().</pre>1093 ··········<pre·translate="no"><span·class="attribute">-spec</span>·chomp(String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>())·->·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>().</pre>
  
1094 ······</div>1094 ······</div>
  
1095 <p>Returns·a·string·where·any·trailing·<code·class="inline">\n</code>·or·<code·class="inline">\r\n</code>·have·been·removed·from1095 <p>Returns·a·string·where·any·trailing·<code·class="inline">\n</code>·or·<code·class="inline">\r\n</code>·have·been·removed·from
1096 <code·class="inline">String</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">182&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">chomp</span><span·class="p"·data-group-id="4863554232-1">(</span><span·class="p"·data-group-id="4863554232-2">&lt;&lt;</span><span·class="s">&quot;\nHello\n\n&quot;</span><span·class="p"·data-group-id="4863554232-2">&gt;&gt;</span><span·class="p"·data-group-id="4863554232-1">)</span><span·class="p">.</span><span·class="w">1096 <code·class="inline">String</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">182&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">chomp</span><span·class="p"·data-group-id="1072489093-1">(</span><span·class="p"·data-group-id="1072489093-2">&lt;&lt;</span><span·class="s">&quot;\nHello\n\n&quot;</span><span·class="p"·data-group-id="1072489093-2">&gt;&gt;</span><span·class="p"·data-group-id="1072489093-1">)</span><span·class="p">.</span><span·class="w">
1097 </span><span·class="p"·data-group-id="4863554232-3">&lt;&lt;</span><span·class="s">&quot;\nHello&quot;</span><span·class="p"·data-group-id="4863554232-3">&gt;&gt;</span><span·class="gp·unselectable">1097 </span><span·class="p"·data-group-id="1072489093-3">&lt;&lt;</span><span·class="s">&quot;\nHello&quot;</span><span·class="p"·data-group-id="1072489093-3">&gt;&gt;</span><span·class="gp·unselectable">
1098 183&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">chomp</span><span·class="p"·data-group-id="4863554232-4">(</span><span·class="s">&quot;\nHello\r\r\n&quot;</span><span·class="p"·data-group-id="4863554232-4">)</span><span·class="p">.</span><span·class="w">1098 183&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">chomp</span><span·class="p"·data-group-id="1072489093-4">(</span><span·class="s">&quot;\nHello\r\r\n&quot;</span><span·class="p"·data-group-id="1072489093-4">)</span><span·class="p">.</span><span·class="w">
1099 </span><span·class="s">&quot;\nHello\r&quot;</span></code></pre>1099 </span><span·class="s">&quot;\nHello\r&quot;</span></code></pre>
1100 ··</section>1100 ··</section>
1101 </section>1101 </section>
1102 <section·class="detail"·id="equal/2">1102 <section·class="detail"·id="equal/2">
  
1103 ··<div·class="detail-header">1103 ··<div·class="detail-header">
1104 ····<a·href="#equal/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1104 ····<a·href="#equal/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1189, 19 lines modifiedOffset 1189, 19 lines modified
  
1189 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">A</code>·and·<code·class="inline">B</code>·are·equal,·otherwise·<code·class="inline">false</code>.</p><p>If·<code·class="inline">IgnoreCase</code>·is·<code·class="inline">true</code>·the·function·does·<a·href="#casefold/1"><code·class="inline">casefold</code>ing</a>·on·the1189 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">A</code>·and·<code·class="inline">B</code>·are·equal,·otherwise·<code·class="inline">false</code>.</p><p>If·<code·class="inline">IgnoreCase</code>·is·<code·class="inline">true</code>·the·function·does·<a·href="#casefold/1"><code·class="inline">casefold</code>ing</a>·on·the
1190 fly·before·the·equality·test.</p><p>If·<code·class="inline">Norm</code>·is·not·<code·class="inline">none</code>·the·function·applies·normalization·on·the·fly·before·the1190 fly·before·the·equality·test.</p><p>If·<code·class="inline">Norm</code>·is·not·<code·class="inline">none</code>·the·function·applies·normalization·on·the·fly·before·the
1191 equality·test.·There·are·four·available·normalization·forms:1191 equality·test.·There·are·four·available·normalization·forms:
1192 <a·href="unicode.html#characters_to_nfc_list/1"><code·class="inline">nfc</code></a>,1192 <a·href="unicode.html#characters_to_nfc_list/1"><code·class="inline">nfc</code></a>,
1193 <a·href="unicode.html#characters_to_nfd_list/1"><code·class="inline">nfd</code></a>,1193 <a·href="unicode.html#characters_to_nfd_list/1"><code·class="inline">nfd</code></a>,
1194 <a·href="unicode.html#characters_to_nfkc_list/1"><code·class="inline">nfkc</code></a>,·and1194 <a·href="unicode.html#characters_to_nfkc_list/1"><code·class="inline">nfkc</code></a>,·and
1195 <a·href="unicode.html#characters_to_nfkd_list/1"><code·class="inline">nfkd</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">equal</span><span·class="p"·data-group-id="9171652216-1">(</span><span·class="s">&quot;åäö&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9171652216-2">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</spa[·...·truncated·by·diffoscope;·len:·103,·SHA:·903e03d67942748249bec5bec826ae87c867c21a6b91570768aa826795af2dd0·...·]-1">)</span><span·class="p">.</span><span·class="w">1195 <a·href="unicode.html#characters_to_nfkd_list/1"><code·class="inline">nfkd</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">equal</span><span·class="p"·data-group-id="6595790412-1">(</span><span·class="s">&quot;åäö&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6595790412-2">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</spa[·...·truncated·by·diffoscope;·len:·103,·SHA:·55ad354a7b4b38add04f91865580c1d91926613682f76cad230d6c03ee86315a·...·]-1">)</span><span·class="p">.</span><span·class="w">
1196 </span><span·class="ss">true</span><span·class="gp·unselectable">1196 </span><span·class="ss">true</span><span·class="gp·unselectable">
1197 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">equal</span><span·class="p"·data-group-id="9171652216-3">(</span><span·class="s">&quot;åäö&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_binary</span><span·class="p"·data-group-id="9171652216-4">[·...·truncated·by·diffoscope;·len:·140,·SHA:·a8cecda541d225aea2bb031de9df0f44a8733d59a28185e5a6fc607c528c1d39·...·]-3">)</span><span·class="p">.</span><span·class="w">1197 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">equal</span><span·class="p"·data-group-id="6595790412-3">(</span><span·class="s">&quot;åäö&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_binary</span><span·class="p"·data-group-id="6595790412-4">[·...·truncated·by·diffoscope;·len:·140,·SHA:·49f9f55974c466e01d325d47e87e19a15316ee672fff4fdcf83980d5c2fd72e5·...·]-3">)</span><span·class="p">.</span><span·class="w">
1198 </span><span·class="ss">false</span><span·class="gp·unselectable">1198 </span><span·class="ss">false</span><span·class="gp·unselectable">
1199 3&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">equal</span><span·class="p"·data-group-id="9171652216-5">(</span><span·class="s">&quot;åäö&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_binary</span><span·class="p"·data-group-id="9171652216-6">[·...·truncated·by·diffoscope;·len:·291,·SHA:·b77ef32cf2f09af558e7a22299036719edab6f2514ae470aafce86bbe5aeba57·...·]-5">)</span><span·class="p">.</span><span·class="w">1199 3&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">equal</span><span·class="p"·data-group-id="6595790412-5">(</span><span·class="s">&quot;åäö&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_binary</span><span·class="p"·data-group-id="6595790412-6">[·...·truncated·by·diffoscope;·len:·291,·SHA:·7a898cbbd6eab72921fe5686cf79832fcf571e94634a61701adc4e704c9b2e54·...·]-5">)</span><span·class="p">.</span><span·class="w">
1200 </span><span·class="ss">true</span></code></pre>1200 </span><span·class="ss">true</span></code></pre>
1201 ··</section>1201 ··</section>
1202 </section>1202 </section>
1203 <section·class="detail"·id="find/2">1203 <section·class="detail"·id="find/2">
  
1204 ··<div·class="detail-header">1204 ··<div·class="detail-header">
1205 ····<a·href="#find/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1205 ····<a·href="#find/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1255, 21 lines modifiedOffset 1255, 21 lines modified
1255 ··············when·String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>(),·SearchPattern·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>(),·Dir·::·<a·href="#t:direction/0">direction</a>().</pre>1255 ··············when·String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>(),·SearchPattern·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>(),·Dir·::·<a·href="#t:direction/0">direction</a>().</pre>
  
1256 ······</div>1256 ······</div>
  
1257 <p>Removes·anything·before·<code·class="inline">SearchPattern</code>·in·<code·class="inline">String</code>·and·returns·the·remainder·of1257 <p>Removes·anything·before·<code·class="inline">SearchPattern</code>·in·<code·class="inline">String</code>·and·returns·the·remainder·of
1258 the·string·or·<code·class="inline">nomatch</code>·if·<code·class="inline">SearchPattern</code>·is·not·found.·<code·class="inline">Dir</code>,·which·can·be1258 the·string·or·<code·class="inline">nomatch</code>·if·<code·class="inline">SearchPattern</code>·is·not·found.·<code·class="inline">Dir</code>,·which·can·be
1259 <code·class="inline">leading</code>·or·<code·class="inline">trailing</code>,·indicates·from·which·direction·characters·are·to·be1259 <code·class="inline">leading</code>·or·<code·class="inline">trailing</code>,·indicates·from·which·direction·characters·are·to·be
1260 searched.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="2897928804-1">(</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.&quot;</span><span·class="p"·data-group-id="2897928804-1">)</span><span·class="p">.</span><span·class="w">1260 searched.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="6014405702-1">(</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;.&quot;</span><span·class="p"·data-group-id="6014405702-1">)</span><span·class="p">.</span><span·class="w">
1261 </span><span·class="s">&quot;..cd..ef&quot;</span><span·class="gp·unselectable">1261 </span><span·class="s">&quot;..cd..ef&quot;</span><span·class="gp·unselectable">
1262 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="2897928804-2">(</span><span·class="p"·data-group-id="2897928804-3">&lt;&lt;</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p"·data-group-id="2897928804-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·137,·SHA:·127583cf8997ccd5bef1a35278788152e49197ceae5bb9d79e1dcc8536881a7c·...·]-2">)</span><span·class="p">.</span><span·class="w">1262 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="6014405702-2">(</span><span·class="p"·data-group-id="6014405702-3">&lt;&lt;</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p"·data-group-id="6014405702-3">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·137,·SHA:·28a5269dfb7909e5540347bef1475e5b64df4ab5741064c304406c3b8ffb0a66·...·]-2">)</span><span·class="p">.</span><span·class="w">
1263 </span><span·class="p"·data-group-id="2897928804-4">&lt;&lt;</span><span·class="s">&quot;..ef&quot;</span><span·class="p"·data-group-id="2897928804-4">&gt;&gt;</span><span·class="gp·unselectable">1263 </span><span·class="p"·data-group-id="6014405702-4">&lt;&lt;</span><span·class="s">&quot;..ef&quot;</span><span·class="p"·data-group-id="6014405702-4">&gt;&gt;</span><span·class="gp·unselectable">
1264 3&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="2897928804-5">(</span><span·class="p"·data-group-id="2897928804-6">&lt;&lt;</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p"·data-group-id="2897928804-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·135,·SHA:·a1ebc89f23d9ec9115dfcd48240a51a1f16234e0772e607369467562c5aec081·...·]-5">)</span><span·class="p">.</span><span·class="w">1264 3&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="6014405702-5">(</span><span·class="p"·data-group-id="6014405702-6">&lt;&lt;</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p"·data-group-id="6014405702-6">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot[·...·truncated·by·diffoscope;·len:·135,·SHA:·106a76c979d70b6a08ed1dc04de00afa3f0f70d4e5aa504c28d8a7a4755465ca·...·]-5">)</span><span·class="p">.</span><span·class="w">
1265 </span><span·class="ss">nomatch</span><span·class="gp·unselectable">1265 </span><span·class="ss">nomatch</span><span·class="gp·unselectable">
1266 4&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="2897928804-7">(</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;x&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">trailing</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·0258c5e7109615ba88c26c774cf954c9571ff1d85ddebe2dc456a549570ab139·...·]-7">)</span><span·class="p">.</span><span·class="w">1266 4&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">find</span><span·class="p"·data-group-id="6014405702-7">(</span><span·class="s">&quot;ab..cd..ef&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;x&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">trailing</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·03e363d389d5a2b1e13f7c7dd324edea34f0662c832f5f328c2f2a4220b86556·...·]-7">)</span><span·class="p">.</span><span·class="w">
1267 </span><span·class="ss">nomatch</span></code></pre>1267 </span><span·class="ss">nomatch</span></code></pre>
1268 ··</section>1268 ··</section>
1269 </section>1269 </section>
1270 <section·class="detail"·id="is_empty/1">1270 <section·class="detail"·id="is_empty/1">
  
1271 ··<div·class="detail-header">1271 ··<div·class="detail-header">
1272 ····<a·href="#is_empty/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1272 ····<a·href="#is_empty/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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1290 ······<div·class="specs">1290 ······<div·class="specs">
  
1291 ··········<pre·translate="no"><span·class="attribute">-spec</span>·is_empty(String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>().</pre>1291 ··········<pre·translate="no"><span·class="attribute">-spec</span>·is_empty(String·::·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>())·->·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:boolean/0">boolean</a>().</pre>
  
1292 ······</div>1292 ······</div>
  
1293 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">String</code>·is·the·empty·string,·otherwise·<code·class="inline">false</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">is_empty</span><span·class="p"·data-group-id="1826605523-1">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="1826605523-1">)</span><span·class="p">.</span><span·class="w">1293 <p>Returns·<code·class="inline">true</code>·if·<code·class="inline">String</code>·is·the·empty·string,·otherwise·<code·class="inline">false</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">is_empty</span><span·class="p"·data-group-id="9311514611-1">(</span><span·class="s">&quot;foo&quot;</span><span·class="p"·data-group-id="9311514611-1">)</span><span·class="p">.</span><span·class="w">
1294 </span><span·class="ss">false</span><span·class="gp·unselectable">1294 </span><span·class="ss">false</span><span·class="gp·unselectable">
1295 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">is_empty</span><span·class="p"·data-group-id="1826605523-2">(</span><span·class="p"·data-group-id="1826605523-3">[</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="1826605523-4">&lt;&lt;</span><span·class="p"·data-group-id="1826605523-4">&gt;&gt;</span><s[·...·truncated·by·diffoscope;·len:·92,·SHA:·a2d4ab7728da303269283e92a45b67660869163b3bb62933d156a22c67e9ee40·...·]-2">)</span><span·class="p">.</span><span·class="w">1295 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">is_empty</span><span·class="p"·data-group-id="9311514611-2">(</span><span·class="p"·data-group-id="9311514611-3">[</span><span·class="s">&quot;&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="9311514611-4">&lt;&lt;</span><span·class="p"·data-group-id="9311514611-4">&gt;&gt;</span><s[·...·truncated·by·diffoscope;·len:·92,·SHA:·9bbb4a6167b94b91ac42fb0375bc082697ce849b04d6275c758a05104d6a3c7c·...·]-2">)</span><span·class="p">.</span><span·class="w">
1296 </span><span·class="ss">true</span></code></pre>1296 </span><span·class="ss">true</span></code></pre>
1297 ··</section>1297 ··</section>
1298 </section>1298 </section>
1299 <section·class="detail"·id="jaro_similarity/2">1299 <section·class="detail"·id="jaro_similarity/2">
  
1300 ··<div·class="detail-header">1300 ··<div·class="detail-header">
1301 ····<a·href="#jaro_similarity/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1301 ····<a·href="#jaro_similarity/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
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1328 ·····························Similarity·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:float/0">float</a>().</pre>1328 ·····························Similarity·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:float/0">float</a>().</pre>
  
1329 ······</div>1329 ······</div>
  
1330 <p>Returns·a·float·between·<code·class="inline">+0.0</code>·and·<code·class="inline">1.0</code>·representing·the1330 <p>Returns·a·float·between·<code·class="inline">+0.0</code>·and·<code·class="inline">1.0</code>·representing·the
1331 <a·href="https://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance">Jaro·similarity</a>1331 <a·href="https://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance">Jaro·similarity</a>
1332 between·the·given·strings.·Strings·with·a·higher·similarity·will·score·closer1332 between·the·given·strings.·Strings·with·a·higher·similarity·will·score·closer
1333 to·<code·class="inline">1.0</code>,·with·<code·class="inline">+0.0</code>·meaning·no·similarity·and·<code·class="inline">1.0</code>·meaning·an·exact·match.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">jaro_similarity</span><span·class="p"·data-group-id="5696191803-1">(</span><span·class="s">&quot;ditto&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;ditto&quot;</span><span·class="p"·data-group-id="5696191803-1">)</span><span·class="p">.</span><span·class="w">1333 to·<code·class="inline">1.0</code>,·with·<code·class="inline">+0.0</code>·meaning·no·similarity·and·<code·class="inline">1.0</code>·meaning·an·exact·match.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">jaro_similarity</span><span·class="p"·data-group-id="7649952304-1">(</span><span·class="s">&quot;ditto&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;ditto&quot;</span><span·class="p"·data-group-id="7649952304-1">)</span><span·class="p">.</span><span·class="w">
1334 </span><span·class="mf">1.0</span><span·class="gp·unselectable">1334 </span><span·class="mf">1.0</span><span·class="gp·unselectable">
1335 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">jaro_similarity</span><span·class="p"·data-group-id="5696191803-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="5696191803-2">)</span><span·class="p">.</span><span·class="w">1335 2&gt;·</span><span·class="nc">string</span><span·class="p">:</span><span·class="nf">jaro_similarity</span><span·class="p"·data-group-id="7649952304-2">(</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;bar&quot;</span><span·class="p"·data-group-id="7649952304-2">)</span><span·class="p">.</span><span·class="w">
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154 left.</p><p><a·href=""·id="sup_flags"></a></p><h3·id="module-supervisor-flags"·class="section-heading">154 left.</p><p><a·href=""·id="sup_flags"></a></p><h3·id="module-supervisor-flags"·class="section-heading">
155 ··<a·href="#module-supervisor-flags"·class="hover-link">155 ··<a·href="#module-supervisor-flags"·class="hover-link">
156 ····<i·class="ri-link-m"·aria-hidden="true"></i>156 ····<i·class="ri-link-m"·aria-hidden="true"></i>
157 ··</a>157 ··</a>
158 ··<span·class="text">Supervisor·flags</span>158 ··<span·class="text">Supervisor·flags</span>
159 </h3>159 </h3>
160 <p>The·supervisor·properties·are·defined·by·the·supervisor·flags.·The·type160 <p>The·supervisor·properties·are·defined·by·the·supervisor·flags.·The·type
161 definition·for·the·supervisor·flags·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sup_flags</span><span·class="p"·data-group-id="5166962907-1">(</span><span·class="p"·data-group-id="5166962907-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5166962907-2">#{</span><span·class="ss">strategy</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">strategy</span><span·class="p"·data-group-id="5166962907-3">(</span><span·class="p"·data-group-id="5166962907-3">)</span><span·class="p">,</span><span·class="w">···········</span><span·class="c1">%·optional</span><span·class="w"> 
162 ················</span><span·class="ss">intensity</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="5166962907-4">(</span><span·class="p"·data-group-id="5166962907-4">)</span><span·class="p">,</span><span·class="w">···</span><span·class="c1">%·optional</span><span·class="w"> 
163 ················</span><span·class="ss">period</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="5166962907-5">(</span><span·class="p"·data-group-id="5166962907-5">)</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·optional</span><span·class="w"> 
164 ················</span><span·class="ss">auto_shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">auto_shutdown</span><span·class="p"·data-group-id="5166962907-6">(</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·262,·SHA:·9feed04bc3736b9ce09b297781cfb8b838b6cf964bd8f091200937c943a42552·...·]161 definition·for·the·supervisor·flags·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">sup_flags</span><span·class="p"·data-group-id="4253272323-1">(</span><span·class="p"·data-group-id="4253272323-1">)</span><span·class="w"[·...·truncated·by·diffoscope;·len:·465,·SHA:·c7a75998b6260b7d236d462c4aada71a0d72ac42de085c384bff1629a2fb509a·...·]
 162 ················</span><span·class="ss">intensity</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">non_neg_integer</span><span·class="p"·data-group-id="4253272323-4">(</span><span·class="p"·data-group-id="4253272323-4">)</span><span·class="p">,</span><span·class="w">···</span><span·class="c1">%·optional</span><span·class="w">
 163 ················</span><span·class="ss">period</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">pos_integer</span><span·class="p"·data-group-id="4253272323-5">(</span><span·class="p"·data-group-id="4253272323-5">)</span><span·class="p">,</span><span·class="w">··········</span><span·class="c1">%·optional</span><span·class="w">
 164 ················</span><span·class="ss">auto_shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">auto_shutdown</span><span·class="p"·data-group-id="4253272323-6">(</span><span·class="p"·data-group-id="4253272323-6">)</span><span·class="p"·data-group-id="4253272323-2">}</span><span·class="w">·</span><span·class="c1">%·optional</span></code></pre><h4>Restart·Strategies</h4><p>A·supervisor·can·have·one·of·the·following·<em>restart·strategies</em>·specified·with
165 the·<code·class="inline">strategy</code>·key·in·the·above·map:</p><ul><li><p><code·class="inline">one_for_one</code>·-·If·one·child·process·terminates·and·is·to·be·restarted,·only165 the·<code·class="inline">strategy</code>·key·in·the·above·map:</p><ul><li><p><code·class="inline">one_for_one</code>·-·If·one·child·process·terminates·and·is·to·be·restarted,·only
166 that·child·process·is·affected.·This·is·the·default·restart·strategy.</p></li><li><p><code·class="inline">one_for_all</code>·-·If·one·child·process·terminates·and·is·to·be·restarted,·all166 that·child·process·is·affected.·This·is·the·default·restart·strategy.</p></li><li><p><code·class="inline">one_for_all</code>·-·If·one·child·process·terminates·and·is·to·be·restarted,·all
167 other·child·processes·are·terminated·and·then·all·child·processes·are167 other·child·processes·are·terminated·and·then·all·child·processes·are
168 restarted.</p></li><li><p><code·class="inline">rest_for_one</code>·-·If·one·child·process·terminates·and·is·to·be·restarted,·the168 restarted.</p></li><li><p><code·class="inline">rest_for_one</code>·-·If·one·child·process·terminates·and·is·to·be·restarted,·the
169 'rest'·of·the·child·processes·(that·is,·the·child·processes·after·the169 'rest'·of·the·child·processes·(that·is,·the·child·processes·after·the
170 terminated·child·process·in·the·start·order)·are·terminated.·Then·the170 terminated·child·process·in·the·start·order)·are·terminated.·Then·the
171 terminated·child·process·and·all·child·processes·after·it·are·restarted.</p></li><li><p><code·class="inline">simple_one_for_one</code>·-·A·simplified·<code·class="inline">one_for_one</code>·supervisor,·where·all·child171 terminated·child·process·and·all·child·processes·after·it·are·restarted.</p></li><li><p><code·class="inline">simple_one_for_one</code>·-·A·simplified·<code·class="inline">one_for_one</code>·supervisor,·where·all·child
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201 the·automatic·shutdowns·they·rely·on·will·not·happen.</p><p>It·is·up·to·implementors·to·take·proper·precautions·if·they·expect·that·their201 the·automatic·shutdowns·they·rely·on·will·not·happen.</p><p>It·is·up·to·implementors·to·take·proper·precautions·if·they·expect·that·their
202 applications·may·be·compiled·with·older·OTP·versions.</p></section><p><a·href=""·id="child_spec"></a></p><h3·id="module-child-specification"·class="section-heading">202 applications·may·be·compiled·with·older·OTP·versions.</p></section><p><a·href=""·id="child_spec"></a></p><h3·id="module-child-specification"·class="section-heading">
203 ··<a·href="#module-child-specification"·class="hover-link">203 ··<a·href="#module-child-specification"·class="hover-link">
204 ····<i·class="ri-link-m"·aria-hidden="true"></i>204 ····<i·class="ri-link-m"·aria-hidden="true"></i>
205 ··</a>205 ··</a>
206 ··<span·class="text">Child·specification</span>206 ··<span·class="text">Child·specification</span>
207 </h3>207 </h3>
208 <p>The·type·definition·of·a·child·specification·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">child_spec</span><span·class="p"·data-group-id="0919332787-1">(</span><span·class="p"·data-group-id="0919332787-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0919332787-2">#{</span><span·class="ss">id</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·172,·SHA:·1efc43aeb00d5d2d79a8e31b66e4a350e6248cd3e717c7deb44f8292d705a091·...·]-3">)</span><span·class="p">,</span><span·class="w">·············</span><span·class="c1">%·mandatory</span><span·class="w">208 <p>The·type·definition·of·a·child·specification·is·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">child_spec</span><span·class="p"·data-group-id="0869590874-1">(</span><span·class="p"·data-group-id="0869590874-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="0869590874-2">#{</span><span·class="ss">id</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·172,·SHA:·9f513d8370483681bd2b1b680cbc7e2429897b5d0404b9b17e25a8e6574c2801·...·]-3">)</span><span·class="p">,</span><span·class="w">·············</span><span·class="c1">%·mandatory</span><span·class="w">
209 ·················</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">mfargs</span><span·class="p"·data-group-id="0919332787-4">(</span><span·class="p"·data-group-id="0919332787-4">)</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·mandatory</span><span·class="w">209 ·················</span><span·class="ss">start</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">mfargs</span><span·class="p"·data-group-id="0869590874-4">(</span><span·class="p"·data-group-id="0869590874-4">)</span><span·class="p">,</span><span·class="w">············</span><span·class="c1">%·mandatory</span><span·class="w">
210 ·················</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">restart</span><span·class="p"·data-group-id="0919332787-5">(</span><span·class="p"·data-group-id="0919332787-5">)</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·optional</span><span·class="w">210 ·················</span><span·class="ss">restart</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">restart</span><span·class="p"·data-group-id="0869590874-5">(</span><span·class="p"·data-group-id="0869590874-5">)</span><span·class="p">,</span><span·class="w">·········</span><span·class="c1">%·optional</span><span·class="w">
211 ·················</span><span·class="ss">significant</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">significant</span><span·class="p"·data-group-id="0919332787-6">(</span><span·class="p"·data-group-id="0919332787-6">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·optional</span><span·class="w">211 ·················</span><span·class="ss">significant</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">significant</span><span·class="p"·data-group-id="0869590874-6">(</span><span·class="p"·data-group-id="0869590874-6">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·optional</span><span·class="w">
212 ·················</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="0919332787-7">(</span><span·class="p"·data-group-id="0919332787-7">)</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·optional</span><span·class="w">212 ·················</span><span·class="ss">shutdown</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">shutdown</span><span·class="p"·data-group-id="0869590874-7">(</span><span·class="p"·data-group-id="0869590874-7">)</span><span·class="p">,</span><span·class="w">·······</span><span·class="c1">%·optional</span><span·class="w">
213 ·················</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">worker</span><span·class="p"·data-group-id="0919332787-8">(</span><span·class="p"·data-group-id="0919332787-8">)</span><span·class="p">,</span><span·class="w">·············</span><span·class="c1">%·optional</span><span·class="w">213 ·················</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">worker</span><span·class="p"·data-group-id="0869590874-8">(</span><span·class="p"·data-group-id="0869590874-8">)</span><span·class="p">,</span><span·class="w">·············</span><span·class="c1">%·optional</span><span·class="w">
214 ·················</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="0919332787-9">(</span><span·class="p"·data-group-id="0919332787-9">)</span><span·class="p"·data-group-id="0919332787-2">}</span><span·class="w">·········</span><span·class="c1">%·optional</span></code></pre><p>The·old·tuple·format·is·kept·for·backwards·compatibility,·see·<a·href="#t:child_spec/0"><code·class="inline">child_spec/0</code></a>,214 ·················</span><span·class="ss">modules</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="nf">modules</span><span·class="p"·data-group-id="0869590874-9">(</span><span·class="p"·data-group-id="0869590874-9">)</span><span·class="p"·data-group-id="0869590874-2">}</span><span·class="w">·········</span><span·class="c1">%·optional</span></code></pre><p>The·old·tuple·format·is·kept·for·backwards·compatibility,·see·<a·href="#t:child_spec/0"><code·class="inline">child_spec/0</code></a>,
215 but·the·map·is·preferred.</p><ul><li><p><code·class="inline">id</code>·is·used·to·identify·the·child·specification·internally·by·the·supervisor.</p><p>The·<code·class="inline">id</code>·key·is·mandatory.</p><p>Notice·that·this·identifier·on·occations·has·been·called·&quot;name&quot;.·As·far·as215 but·the·map·is·preferred.</p><ul><li><p><code·class="inline">id</code>·is·used·to·identify·the·child·specification·internally·by·the·supervisor.</p><p>The·<code·class="inline">id</code>·key·is·mandatory.</p><p>Notice·that·this·identifier·on·occations·has·been·called·&quot;name&quot;.·As·far·as
216 possible,·the·terms·&quot;identifier&quot;·or·&quot;id&quot;·are·now·used·but·to·keep·backward216 possible,·the·terms·&quot;identifier&quot;·or·&quot;id&quot;·are·now·used·but·to·keep·backward
217 compatibility,·some·occurences·of·&quot;name&quot;·can·still·be·found,·for·example·in217 compatibility,·some·occurences·of·&quot;name&quot;·can·still·be·found,·for·example·in
218 error·messages.</p></li><li><p><code·class="inline">start</code>·defines·the·function·call·used·to·start·the·child·process.·It·must·be218 error·messages.</p></li><li><p><code·class="inline">start</code>·defines·the·function·call·used·to·start·the·child·process.·It·must·be
219 a·module-function-arguments·tuple·<code·class="inline">{M,F,A}</code>·used·as219 a·module-function-arguments·tuple·<code·class="inline">{M,F,A}</code>·used·as
220 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,F,A)</code></a>.</p><p>The·start·function·<em>must·create·and·link·to</em>·the·child·process,·and·must220 <a·href="../../../../erts-15.2.6/doc/html/erlang.html#apply/3"><code·class="inline">apply(M,F,A)</code></a>.</p><p>The·start·function·<em>must·create·and·link·to</em>·the·child·process,·and·must
221 return·<code·class="inline">{ok,Child}</code>·or·<code·class="inline">{ok,Child,Info}</code>,·where·<code·class="inline">Child</code>·is·the·pid·of·the221 return·<code·class="inline">{ok,Child}</code>·or·<code·class="inline">{ok,Child,Info}</code>,·where·<code·class="inline">Child</code>·is·the·pid·of·the
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1739 ········Built·using1739 ········Built·using
1740 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1740 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
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1742 ······</p>1742 ······</p>
1743 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1743 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1744 ····</footer>1744 ····</footer>
1745 ··</div>1745 ··</div>
1746 </main>1746 </main>
1747 </div>1747 </div>
1748 <script>1748 <script>
1749 ··function·mermaidLoaded()·{1749 ··function·mermaidLoaded()·{
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408 ········Built·using408 ········Built·using
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411 ······</p>411 ······</p>
412 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>412 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
413 ····</footer>413 ····</footer>
414 ··</div>414 ··</div>
415 </main>415 </main>
416 </div>416 </div>
417 <script>417 <script>
418 ··function·mermaidLoaded()·{418 ··function·mermaidLoaded()·{
419 ····mermaid.initialize({419 ····mermaid.initialize({
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2234 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2234 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2235 ····</footer>2235 ····</footer>
2236 ··</div>2236 ··</div>
2237 </main>2237 </main>
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142 <a·href="../../../../erts-15.2.6/doc/html/time_correction.html"><em>Time·and·Time·Correction·in·Erlang</em></a>142 <a·href="../../../../erts-15.2.6/doc/html/time_correction.html"><em>Time·and·Time·Correction·in·Erlang</em></a>
143 ERTS·User's·guide.</p><h2·id="module-examples"·class="section-heading">143 ERTS·User's·guide.</p><h2·id="module-examples"·class="section-heading">
144 ··<a·href="#module-examples"·class="hover-link">144 ··<a·href="#module-examples"·class="hover-link">
145 ····<i·class="ri-link-m"·aria-hidden="true"></i>145 ····<i·class="ri-link-m"·aria-hidden="true"></i>
146 ··</a>146 ··</a>
147 ··<span·class="text">Examples</span>147 ··<span·class="text">Examples</span>
148 </h2>148 </h2>
149 <p><em>Example·1</em></p><p>The·following·example·shows·how·to·print·&quot;Hello·World!&quot;·in·5·seconds:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="6220637228-1">(</span><span·class="mi">5000</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">io</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">format</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·440,·SHA:·f7c0f23c194b0e12996e60e92b41226283143b265e654442b7e705e8b0e5441b·...·]-1">)</span><span·class="p">.</span><span·class="w">149 <p><em>Example·1</em></p><p>The·following·example·shows·how·to·print·&quot;Hello·World!&quot;·in·5·seconds:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="1995667259-1">(</span><span·class="mi">5000</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">io</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">format</span><span·class="p">,</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·440,·SHA:·c6c1ee9d8e054020d33df74c39377c2ab6828cbcd65dbe4da3e27164d8650a3e·...·]-1">)</span><span·class="p">.</span><span·class="w">
150 </span><span·class="p"·data-group-id="6220637228-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="6220637228-4">}</span><span·class="w">150 </span><span·class="p"·data-group-id="1995667259-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="1995667259-4">}</span><span·class="w">
151 </span><span·class="n">Hello</span><span·class="w">·</span><span·class="n">World</span><span·class="o">!</span></code></pre><p><em>Example·2</em></p><p>The·following·example·shows·a·process·performing·a·certain·action,·and·if·this151 </span><span·class="n">Hello</span><span·class="w">·</span><span·class="n">World</span><span·class="o">!</span></code></pre><p><em>Example·2</em></p><p>The·following·example·shows·a·process·performing·a·certain·action,·and·if·this
152 action·is·not·completed·within·a·certain·limit,·the·process·is·killed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Pid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="1560598696-1">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1560598696-2">[</span><span·class="ss">foo</span><span[·...·truncated·by·diffoscope;·len:·164,·SHA:·63a3828f8202553b7d42fc920d9fa44e40fa0421048ce37df777bc7affc30d26·...·]-1">)</span><span·class="p">,</span><span·class="w">152 action·is·not·completed·within·a·certain·limit,·the·process·is·killed:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Pid</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4548553979-1">(</span><span·class="ss">mod</span><span·class="p">,</span><span·class="w">·</span><span·class="k">fun</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4548553979-2">[</span><span·class="ss">foo</span><span[·...·truncated·by·diffoscope;·len:·164,·SHA:·dcc4ff346424d1d8defbad4d238d57d449534617815a20f17428e4e9fbcfc7b9·...·]-1">)</span><span·class="p">,</span><span·class="w">
153 </span><span·class="c1">%%·If·pid·is·not·finished·in·10·seconds,·kill·him</span><span·class="w">153 </span><span·class="c1">%%·If·pid·is·not·finished·in·10·seconds,·kill·him</span><span·class="w">
154 </span><span·class="p"·data-group-id="1560598696-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p"·data-group-id="1560598696-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·460,·SHA:·40a7ad46ef7912b9acf421962476789be52630550575ced8b1a8d7841d2360f2·...·]-4">)</span><span·class="p">,</span><span·class="w">154 </span><span·class="p"·data-group-id="4548553979-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">R</span><span·class="p"·data-group-id="4548553979-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·460,·SHA:·e4ff6db6ac7af7ae9b313dba89e82414377301634a71f77f17e06205058f81f7·...·]-4">)</span><span·class="p">,</span><span·class="w">
155 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">155 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
156 </span><span·class="c1">%%·We·change·our·mind...</span><span·class="w">156 </span><span·class="c1">%%·We·change·our·mind...</span><span·class="w">
157 </span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">cancel</span><span·class="p"·data-group-id="1560598696-6">(</span><span·class="n">R</span><span·class="p"·data-group-id="1560598696-6">)</span><span·class="p">,</span><span·class="w">157 </span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">cancel</span><span·class="p"·data-group-id="4548553979-6">(</span><span·class="n">R</span><span·class="p"·data-group-id="4548553979-6">)</span><span·class="p">,</span><span·class="w">
158 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="module-notes"·class="section-heading">158 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="module-notes"·class="section-heading">
159 ··<a·href="#module-notes"·class="hover-link">159 ··<a·href="#module-notes"·class="hover-link">
160 ····<i·class="ri-link-m"·aria-hidden="true"></i>160 ····<i·class="ri-link-m"·aria-hidden="true"></i>
161 ··</a>161 ··</a>
162 ··<span·class="text">Notes</span>162 ··<span·class="text">Notes</span>
163 </h2>163 </h2>
164 <p>A·timer·can·always·be·removed·by·calling·<a·href="#cancel/1"><code·class="inline">cancel/1</code></a>.</p><p>An·interval·timer,·that·is,·a·timer·created·by·evaluating·any·of·the·functions164 <p>A·timer·can·always·be·removed·by·calling·<a·href="#cancel/1"><code·class="inline">cancel/1</code></a>.</p><p>An·interval·timer,·that·is,·a·timer·created·by·evaluating·any·of·the·functions
Offset 177, 28 lines modifiedOffset 177, 28 lines modified
177 process,·and·therefore·calls·to·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·in·those·functions·will·return·the·Pid177 process,·and·therefore·calls·to·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·in·those·functions·will·return·the·Pid
178 of·this·process,·which·is·different·from·the·process·that·called178 of·this·process,·which·is·different·from·the·process·that·called
179 <code·class="inline">timer:apply_*</code>.</p><p><em>Example</em></p><p>In·the·following·example,·the·intention·is·to·set·a·timer·to·execute·a·function179 <code·class="inline">timer:apply_*</code>.</p><p><em>Example</em></p><p>In·the·following·example,·the·intention·is·to·set·a·timer·to·execute·a·function
180 after·1·second,·which·performs·a·fictional·task,·and·then·wants·to·inform·the180 after·1·second,·which·performs·a·fictional·task,·and·then·wants·to·inform·the
181 process·which·set·the·timer·about·its·completion,·by·sending·it·a·<code·class="inline">done</code>181 process·which·set·the·timer·about·its·completion,·by·sending·it·a·<code·class="inline">done</code>
182 message.</p><p>Using·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·<em>inside</em>·the·timed·function,·the·code·below·does·not·work·as182 message.</p><p>Using·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·<em>inside</em>·the·timed·function,·the·code·below·does·not·work·as
183 intended.·The·task·gets·done,·but·the·<code·class="inline">done</code>·message·gets·sent·to·the·wrong183 intended.·The·task·gets·done,·but·the·<code·class="inline">done</code>·message·gets·sent·to·the·wrong
184 process·and·is·lost.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="0152867518-1">(</span><span·class="mi">1000</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0152867518-2">(</span><span·class="p"·data-group-id="0152867518-2">)</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·566,·SHA:·cdf82fb5112100aca09ca160f8a0ebf7831fe18c5f9ae2189a66577d461ae5bb·...·]-1">)</span><span·class="p">.</span><span·class="w">184 process·and·is·lost.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="6438343685-1">(</span><span·class="mi">1000</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="6438343685-2">(</span><span·class="p"·data-group-id="6438343685-2">)</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·566,·SHA:·1d7ff4530f0b37da83f416a1aa567a81d890bb926072ab1a7e6be21a14bd9fc3·...·]-1">)</span><span·class="p">.</span><span·class="w">
185 </span><span·class="p"·data-group-id="0152867518-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="0152867518-5">}</span><span·class="gp·unselectable">185 </span><span·class="p"·data-group-id="6438343685-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="6438343685-5">}</span><span·class="gp·unselectable">
186 2&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">186 2&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
187 </span><span·class="c1">%%·...·5s·pass...</span><span·class="w">187 </span><span·class="c1">%%·...·5s·pass...</span><span·class="w">
188 </span><span·class="ss">timeout</span></code></pre><p>The·code·below·calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·in·the·process·which·sets·the·timer·and·assigns·it188 </span><span·class="ss">timeout</span></code></pre><p>The·code·below·calls·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#self/0"><code·class="inline">self/0</code></a>·in·the·process·which·sets·the·timer·and·assigns·it
189 to·a·variable,·which·is·then·used·in·the·function·to·send·the·<code·class="inline">done</code>·message·to,189 to·a·variable,·which·is·then·used·in·the·function·to·send·the·<code·class="inline">done</code>·message·to,
190 and·so·works·as·intended.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Target</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="4691765467-1">(</span><span·class="p"·data-group-id="4691765467-1">)</span><span·class="w">190 and·so·works·as·intended.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="n">Target</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="9218681174-1">(</span><span·class="p"·data-group-id="9218681174-1">)</span><span·class="w">
191 </span><span·class="o">&lt;</span><span·class="mf">0.82</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">191 </span><span·class="o">&lt;</span><span·class="mf">0.82</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="gp·unselectable">
192 2&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="4691765467-2">(</span><span·class="mi">1000</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="4691765467-3">(</span><span·class="p"·data-group-id="4691765467-3">)</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·461,·SHA:·286b69708f33c1aa497e36eb978da6819aba8d5a654747c12c3af7ca21705a15·...·]-2">)</span><span·class="p">.</span><span·class="w">192 2&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="9218681174-2">(</span><span·class="mi">1000</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="9218681174-3">(</span><span·class="p"·data-group-id="9218681174-3">)</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·461,·SHA:·d020442406965b99d9611a73e425db687e6f7a6e175df08885660d1376958c4e·...·]-2">)</span><span·class="p">.</span><span·class="w">
193 </span><span·class="p"·data-group-id="4691765467-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="4691765467-5">}</span><span·class="gp·unselectable">193 </span><span·class="p"·data-group-id="9218681174-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="9218681174-5">}</span><span·class="gp·unselectable">
194 3&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">194 3&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
195 </span><span·class="c1">%%·...·1s·passes...</span><span·class="w">195 </span><span·class="c1">%%·...·1s·passes...</span><span·class="w">
196 </span><span·class="ss">done</span></code></pre><p>Another·option·is·to·pass·the·message·target·as·a·parameter·to·the·function.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="0350409676-1">(</span><span·class="mi">1000</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0350409676-2">(</span><span·class="n">Target</span><span·class="p"·data-group-id="0350409676-2">)</s[·...·truncated·by·diffoscope;·len:·778,·SHA:·b265c8279dc9381bcaa29aba030c604698b29ca88fcda8e425abf2b557570c5b·...·]-1">)</span><span·class="p">.</span><span·class="w">196 </span><span·class="ss">done</span></code></pre><p>Another·option·is·to·pass·the·message·target·as·a·parameter·to·the·function.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">apply_after</span><span·class="p"·data-group-id="8093456097-1">(</span><span·class="mi">1000</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="8093456097-2">(</span><span·class="n">Target</span><span·class="p"·data-group-id="8093456097-2">)</s[·...·truncated·by·diffoscope;·len:·778,·SHA:·48f7ec4634d93a3e2f61fbc566814af28cd973296c771fcc14b0333ed3362039·...·]-1">)</span><span·class="p">.</span><span·class="w">
197 </span><span·class="p"·data-group-id="0350409676-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="0350409676-6">}</span><span·class="gp·unselectable">197 </span><span·class="p"·data-group-id="8093456097-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">TRef</span><span·class="p"·data-group-id="8093456097-6">}</span><span·class="gp·unselectable">
198 2&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">198 2&gt;·</span><span·class="k">receive</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">done</span><span·class="w">·</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">5000</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">timeout</span><span·class="w">·</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
199 </span><span·class="c1">%%·...·1s·passes...</span><span·class="w">199 </span><span·class="c1">%%·...·1s·passes...</span><span·class="w">
200 </span><span·class="ss">done</span></code></pre>200 </span><span·class="ss">done</span></code></pre>
201 ····</section>201 ····</section>
  
202 </div>202 </div>
  
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1578 ········Built·using1578 ········Built·using
1579 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1579 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1580 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1580 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1581 ······</p>1581 ······</p>
1582 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1582 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1583 ····</footer>1583 ····</footer>
1584 ··</div>1584 ··</div>
1585 </main>1585 </main>
1586 </div>1586 </div>
1587 <script>1587 <script>
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1589 ····mermaid.initialize({1589 ····mermaid.initialize({
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1031 binaries·in·other·ways·are·split·on·non-UTF·character·boundaries.·An1031 binaries·in·other·ways·are·split·on·non-UTF·character·boundaries.·An
1032 <code·class="inline">incomplete</code>·tuple·is·then·returned·instead·of·the·<code·class="inline">error</code>·tuple.·It·consists·of1032 <code·class="inline">incomplete</code>·tuple·is·then·returned·instead·of·the·<code·class="inline">error</code>·tuple.·It·consists·of
1033 the·same·parts·as·the·<code·class="inline">error</code>·tuple,·but·the·tag·is·<code·class="inline">incomplete</code>·instead·of1033 the·same·parts·as·the·<code·class="inline">error</code>·tuple,·but·the·tag·is·<code·class="inline">incomplete</code>·instead·of
1034 <code·class="inline">error</code>·and·the·last·element·is·always·guaranteed·to·be·a·binary·consisting·of1034 <code·class="inline">error</code>·and·the·last·element·is·always·guaranteed·to·be·a·binary·consisting·of
1035 the·first·part·of·a·(so·far)·valid·UTF·character.</p><p>If·one·UTF·character·is·split·over·two·consecutive·binaries·in·the·<code·class="inline">Data</code>,·the1035 the·first·part·of·a·(so·far)·valid·UTF·character.</p><p>If·one·UTF·character·is·split·over·two·consecutive·binaries·in·the·<code·class="inline">Data</code>,·the
1036 conversion·succeeds.·This·means·that·a·character·can·be·decoded·from·a·range·of1036 conversion·succeeds.·This·means·that·a·character·can·be·decoded·from·a·range·of
1037 binaries·as·long·as·the·whole·range·is·specified·as·input·without·errors1037 binaries·as·long·as·the·whole·range·is·specified·as·input·without·errors
1038 occurring.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">decode_data</span><span·class="p"·data-group-id="9294521773-1">(</span><span·class="n">Data</span><span·class="p"·data-group-id="9294521773-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1038 occurring.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">decode_data</span><span·class="p"·data-group-id="7678954663-1">(</span><span·class="n">Data</span><span·class="p"·data-group-id="7678954663-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1039 ···</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_list</span><span·class="p"·data-group-id="9294521773-2">(</span><span·class="n">Data</span><span·class="p">,</span><span·class="ss">unicode</span><span·class="p"·data-group-id="9294521773-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">1039 ···</span><span·class="k">case</span><span·class="w">·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_list</span><span·class="p"·data-group-id="7678954663-2">(</span><span·class="n">Data</span><span·class="p">,</span><span·class="ss">unicode</span><span·class="p"·data-group-id="7678954663-2">)</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
1040 ······</span><span·class="p"·data-group-id="9294521773-3">{</span><span·class="ss">incomplete</span><span·class="p">,</span><span·class="n">Encoded</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rest</span><span·class="p"·data-group-id="9294521773-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1040 ······</span><span·class="p"·data-group-id="7678954663-3">{</span><span·class="ss">incomplete</span><span·class="p">,</span><span·class="n">Encoded</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rest</span><span·class="p"·data-group-id="7678954663-3">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1041 ············</span><span·class="n">More</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">get_some_more_data</span><span·class="p"·data-group-id="9294521773-4">(</span><span·class="p"·data-group-id="9294521773-4">)</span><span·class="p">,</span><span·class="w">1041 ············</span><span·class="n">More</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">get_some_more_data</span><span·class="p"·data-group-id="7678954663-4">(</span><span·class="p"·data-group-id="7678954663-4">)</span><span·class="p">,</span><span·class="w">
1042 ············</span><span·class="n">Encoded</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nf">decode_data</span><span·class="p"·data-group-id="9294521773-5">(</span><span·class="p"·data-group-id="9294521773-6">[</span><span·class="n">Rest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">More</span><span·class="p"·data-group-id="9294521773-6">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·14,·SHA:·5463a70b1f62f61f316cabb625bc6d2df3c67c67717e4f62aea53611bb0e403c·...·]3-5">)</span><span·class="p">;</span><span·class="w">1042 ············</span><span·class="n">Encoded</span><span·class="w">·</span><span·class="o">++</span><span·class="w">·</span><span·class="nf">decode_data</span><span·class="p"·data-group-id="7678954663-5">(</span><span·class="p"·data-group-id="7678954663-6">[</span><span·class="n">Rest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">More</span><span·class="p"·data-group-id="7678954663-6">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·14,·SHA:·5d7a9263bcb0ba18b1b44e894d2d346947f5c3f9dd4e3b5e33cfbf1b33f4c278·...·]3-5">)</span><span·class="p">;</span><span·class="w">
1043 ······</span><span·class="p"·data-group-id="9294521773-7">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Encoded</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="9294521773-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1043 ······</span><span·class="p"·data-group-id="7678954663-7">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="n">Encoded</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="7678954663-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1044 ············</span><span·class="nf">handle_error</span><span·class="p"·data-group-id="9294521773-8">(</span><span·class="n">Encoded</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="9294521773-8">)</span><span·class="p">;</span><span·class="w">1044 ············</span><span·class="nf">handle_error</span><span·class="p"·data-group-id="7678954663-8">(</span><span·class="n">Encoded</span><span·class="p">,</span><span·class="n">Rest</span><span·class="p"·data-group-id="7678954663-8">)</span><span·class="p">;</span><span·class="w">
1045 ······</span><span·class="n">List</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">1045 ······</span><span·class="n">List</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
1046 ············</span><span·class="n">List</span><span·class="w">1046 ············</span><span·class="n">List</span><span·class="w">
1047 ···</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>However,·bit·strings·that·are·not·whole·bytes·are·not·allowed,·so·a·UTF1047 ···</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>However,·bit·strings·that·are·not·whole·bytes·are·not·allowed,·so·a·UTF
1048 character·must·be·split·along·8-bit·boundaries·to·ever·be·decoded.</p><p>A·<code·class="inline">badarg</code>·exception·is·thrown·for·the·following·cases:</p><ul><li>Any·parameters·are·of·the·wrong·type.</li><li>The·list·structure·is·invalid·(a·number·as·tail).</li><li>The·binaries·do·not·contain·whole·bytes·(bit·strings).</li></ul>1048 character·must·be·split·along·8-bit·boundaries·to·ever·be·decoded.</p><p>A·<code·class="inline">badarg</code>·exception·is·thrown·for·the·following·cases:</p><ul><li>Any·parameters·are·of·the·wrong·type.</li><li>The·list·structure·is·invalid·(a·number·as·tail).</li><li>The·binaries·do·not·contain·whole·bytes·(bit·strings).</li></ul>
1049 ··</section>1049 ··</section>
1050 </section>1050 </section>
1051 <section·class="detail"·id="characters_to_nfc_binary/1">1051 <section·class="detail"·id="characters_to_nfc_binary/1">
Offset 1070, 16 lines modifiedOffset 1070, 16 lines modified
1070 ······<div·class="specs">1070 ······<div·class="specs">
  
1071 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfc_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>1071 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfc_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1072 ······</div>1072 ······</div>
  
1073 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form1073 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form
1074 of·canonical·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·an·utf8·encoded·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfc_binary</span><span·class="p"·data-group-id="1239179389-1">(</span><span·class="p"·data-group-id="1239179389-2">[</span><span·class="p"·data-group-id="1239179389-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="1239179389-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·645,·SHA:·57cb7b8cb96a1f8ec56379f4e02c572606adda39d0080a76bcc0df169edf338d·...·]-1">)</span><span·class="p">.</span><span·class="w">1074 of·canonical·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·an·utf8·encoded·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfc_binary</span><span·class="p"·data-group-id="4996370577-1">(</span><span·class="p"·data-group-id="4996370577-2">[</span><span·class="p"·data-group-id="4996370577-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="4996370577-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·645,·SHA:·c4495baff7470fffed8273d721cf4ac96cc8d179c1401eaf072570896fa6547d·...·]-1">)</span><span·class="p">.</span><span·class="w">
1075 </span><span·class="p"·data-group-id="1239179389-7">&lt;&lt;</span><span·class="s">&quot;abc..åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="1239179389-7">&gt;&gt;</span></code></pre>1075 </span><span·class="p"·data-group-id="4996370577-7">&lt;&lt;</span><span·class="s">&quot;abc..åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="4996370577-7">&gt;&gt;</span></code></pre>
1076 ··</section>1076 ··</section>
1077 </section>1077 </section>
1078 <section·class="detail"·id="characters_to_nfc_list/1">1078 <section·class="detail"·id="characters_to_nfc_list/1">
  
1079 ··<div·class="detail-header">1079 ··<div·class="detail-header">
1080 ····<a·href="#characters_to_nfc_list/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1080 ····<a·href="#characters_to_nfc_list/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1081 ······<i·class="ri-link-m"·aria-hidden="true"></i>1081 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1100, 15 lines modifiedOffset 1100, 15 lines modified
1100 ······<div·class="specs">1100 ······<div·class="specs">
  
1101 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfc_list(<a·href="#t:chardata/0">chardata</a>())·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()]·|·{error,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()],·<a·href="#t:chardata/0">chardata</a>()}.</pre>1101 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfc_list(<a·href="#t:chardata/0">chardata</a>())·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()]·|·{error,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()],·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1102 ······</div>1102 ······</div>
  
1103 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form1103 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form
1104 of·canonical·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·a·list·of·characters.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfc_list</span><span·class="p"·data-group-id="9919181943-1">(</span><span·class="p"·data-group-id="9919181943-2">[</span><span·class="p"·data-group-id="9919181943-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="9919181943-3">&gt;&gt;</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·643,·SHA:·ffac34e7a411aa3fa61a840e31bd5373b93a91773bd91a75a132c0b0e15836bf·...·]-1">)</span><span·class="p">.</span><span·class="w">1104 of·canonical·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·a·list·of·characters.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfc_list</span><span·class="p"·data-group-id="9925386629-1">(</span><span·class="p"·data-group-id="9925386629-2">[</span><span·class="p"·data-group-id="9925386629-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="9925386629-3">&gt;&gt;</span><span·class="p">,</spa[·...·truncated·by·diffoscope;·len:·643,·SHA:·fac690f5d2700daf547dc151c930590114b5adea1fcb45d1784381c925d62128·...·]-1">)</span><span·class="p">.</span><span·class="w">
1105 </span><span·class="s">&quot;abc..åäö&quot;</span></code></pre>1105 </span><span·class="s">&quot;abc..åäö&quot;</span></code></pre>
1106 ··</section>1106 ··</section>
1107 </section>1107 </section>
1108 <section·class="detail"·id="characters_to_nfd_binary/1">1108 <section·class="detail"·id="characters_to_nfd_binary/1">
  
1109 ··<div·class="detail-header">1109 ··<div·class="detail-header">
1110 ····<a·href="#characters_to_nfd_binary/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1110 ····<a·href="#characters_to_nfd_binary/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1130, 16 lines modifiedOffset 1130, 16 lines modified
1130 ······<div·class="specs">1130 ······<div·class="specs">
  
1131 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfd_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>1131 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfd_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1132 ······</div>1132 ······</div>
  
1133 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form1133 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form
1134 of·canonical·equivalent·Decomposed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·an·utf8·encoded·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_binary</span><span·class="p"·data-group-id="7477957260-1">(</span><span·class="s">&quot;abc..åäö&quot;</span><span·class="p"·data-group-id="7477957260-1">)</span><span·class="p">.</span><span·class="w">1134 of·canonical·equivalent·Decomposed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·an·utf8·encoded·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_binary</span><span·class="p"·data-group-id="6014838927-1">(</span><span·class="s">&quot;abc..åäö&quot;</span><span·class="p"·data-group-id="6014838927-1">)</span><span·class="p">.</span><span·class="w">
1135 </span><span·class="p"·data-group-id="7477957260-2">&lt;&lt;</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p">,</span><span·class="mi">46</span><span·class="p">,</span><span·class="mi">46</span><[·...·truncated·by·diffoscope;·len:·497,·SHA:·20d6bbae7e10bc3000a524481197023d2066d83b990775e80d84f5b8e352a5cd·...·]-2">&gt;&gt;</span></code></pre>1135 </span><span·class="p"·data-group-id="6014838927-2">&lt;&lt;</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p">,</span><span·class="mi">46</span><span·class="p">,</span><span·class="mi">46</span><[·...·truncated·by·diffoscope;·len:·497,·SHA:·e216d1e99c2299d92115e77f0722b63ba6d89e31b086fc0f1a80885eed0c5a68·...·]-2">&gt;&gt;</span></code></pre>
1136 ··</section>1136 ··</section>
1137 </section>1137 </section>
1138 <section·class="detail"·id="characters_to_nfd_list/1">1138 <section·class="detail"·id="characters_to_nfd_list/1">
  
1139 ··<div·class="detail-header">1139 ··<div·class="detail-header">
1140 ····<a·href="#characters_to_nfd_list/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1140 ····<a·href="#characters_to_nfd_list/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1141 ······<i·class="ri-link-m"·aria-hidden="true"></i>1141 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1160, 16 lines modifiedOffset 1160, 16 lines modified
1160 ······<div·class="specs">1160 ······<div·class="specs">
  
1161 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfd_list(<a·href="#t:chardata/0">chardata</a>())·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()]·|·{error,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()],·<a·href="#t:chardata/0">chardata</a>()}.</pre>1161 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfd_list(<a·href="#t:chardata/0">chardata</a>())·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()]·|·{error,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()],·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1162 ······</div>1162 ······</div>
  
1163 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form1163 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form
1164 of·canonical·equivalent·Decomposed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·a·list·of·characters.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_list</span><span·class="p"·data-group-id="8983531445-1">(</span><span·class="s">&quot;abc..åäö&quot;</span><span·class="p"·data-group-id="8983531445-1">)</span><span·class="p">.</span><span·class="w">1164 of·canonical·equivalent·Decomposed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·a·list·of·characters.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfd_list</span><span·class="p"·data-group-id="9205903722-1">(</span><span·class="s">&quot;abc..åäö&quot;</span><span·class="p"·data-group-id="9205903722-1">)</span><span·class="p">.</span><span·class="w">
1165 </span><span·class="p"·data-group-id="8983531445-2">[</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p">,</span><span·class="mi">46</span><span·class="p">,</span><span·class="mi">46</span><span·cl[·...·truncated·by·diffoscope;·len:·337,·SHA:·06ee9605bcb1560b66a2824adef83e6c8f53852374f3723ad2e403c26b9204ed·...·]-2">]</span></code></pre>1165 </span><span·class="p"·data-group-id="9205903722-2">[</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p">,</span><span·class="mi">46</span><span·class="p">,</span><span·class="mi">46</span><span·cl[·...·truncated·by·diffoscope;·len:·337,·SHA:·294ae32cd8da3459dcabaa420ad266177bb0e0212c431be6b5bc810925d56a41·...·]-2">]</span></code></pre>
1166 ··</section>1166 ··</section>
1167 </section>1167 </section>
1168 <section·class="detail"·id="characters_to_nfkc_binary/1">1168 <section·class="detail"·id="characters_to_nfkc_binary/1">
  
1169 ··<div·class="detail-header">1169 ··<div·class="detail-header">
1170 ····<a·href="#characters_to_nfkc_binary/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1170 ····<a·href="#characters_to_nfkc_binary/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1171 ······<i·class="ri-link-m"·aria-hidden="true"></i>1171 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1190, 16 lines modifiedOffset 1190, 16 lines modified
1190 ······<div·class="specs">1190 ······<div·class="specs">
  
1191 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfkc_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>1191 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfkc_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1192 ······</div>1192 ······</div>
  
1193 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form1193 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form
1194 of·compatibly·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·an·utf8·encoded·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfkc_binary</span><span·class="p"·data-group-id="3031127892-1">(</span><span·class="p"·data-group-id="3031127892-2">[</span><span·class="p"·data-group-id="3031127892-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="3031127892-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·857,·SHA:·5153dcf7d7acb0bbc24859a93847cc9c8efbdaad234bda74adea1651def15f5e·...·]-1">)</span><span·class="p">.</span><span·class="w">1194 of·compatibly·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·an·utf8·encoded·binary.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfkc_binary</span><span·class="p"·data-group-id="5400867741-1">(</span><span·class="p"·data-group-id="5400867741-2">[</span><span·class="p"·data-group-id="5400867741-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="5400867741-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·857,·SHA:·a224e6912b583dbb54c7895f5d7cd5a2791acb4d88b615e195a9a3bb13f9cddc·...·]-1">)</span><span·class="p">.</span><span·class="w">
1195 </span><span·class="p"·data-group-id="3031127892-8">&lt;&lt;</span><span·class="s">&quot;abc..åäö32&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="3031127892-8">&gt;&gt;</span></code></pre>1195 </span><span·class="p"·data-group-id="5400867741-8">&lt;&lt;</span><span·class="s">&quot;abc..åäö32&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="5400867741-8">&gt;&gt;</span></code></pre>
1196 ··</section>1196 ··</section>
1197 </section>1197 </section>
1198 <section·class="detail"·id="characters_to_nfkc_list/1">1198 <section·class="detail"·id="characters_to_nfkc_list/1">
  
1199 ··<div·class="detail-header">1199 ··<div·class="detail-header">
1200 ····<a·href="#characters_to_nfkc_list/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1200 ····<a·href="#characters_to_nfkc_list/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1201 ······<i·class="ri-link-m"·aria-hidden="true"></i>1201 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1220, 15 lines modifiedOffset 1220, 15 lines modified
1220 ······<div·class="specs">1220 ······<div·class="specs">
  
1221 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfkc_list(<a·href="#t:chardata/0">chardata</a>())·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()]·|·{error,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()],·<a·href="#t:chardata/0">chardata</a>()}.</pre>1221 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfkc_list(<a·href="#t:chardata/0">chardata</a>())·->·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()]·|·{error,·[<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:char/0">char</a>()],·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1222 ······</div>1222 ······</div>
  
1223 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form1223 <p>Converts·a·possibly·deep·list·of·characters·and·binaries·into·a·Normalized·Form
1224 of·compatibly·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·a·list·of·characters.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfkc_list</span><span·class="p"·data-group-id="5550695412-1">(</span><span·class="p"·data-group-id="5550695412-2">[</span><span·class="p"·data-group-id="5550695412-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="5550695412-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·857,·SHA:·623d08f6746a89bc1b45973c9f66494417295f2c4b2cab04831a10bca4c32998·...·]-1">)</span><span·class="p">.</span><span·class="w">1224 of·compatibly·equivalent·Composed·characters·according·to·the·Unicode·standard.</p><p>Any·binaries·in·the·input·must·be·encoded·with·utf8·encoding.</p><p>The·result·is·a·list·of·characters.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">unicode</span><span·class="p">:</span><span·class="nf">characters_to_nfkc_list</span><span·class="p"·data-group-id="1547644571-1">(</span><span·class="p"·data-group-id="1547644571-2">[</span><span·class="p"·data-group-id="1547644571-3">&lt;&lt;</span><span·class="s">&quot;abc..a&quot;</span><span·class="p"·data-group-id="1547644571-3">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·857,·SHA:·4e2fbc3f3b6585784ef55bee4333cbd88b1f7d81bf8d66563cb775336280cf75·...·]-1">)</span><span·class="p">.</span><span·class="w">
1225 </span><span·class="s">&quot;abc..åäö32&quot;</span></code></pre>1225 </span><span·class="s">&quot;abc..åäö32&quot;</span></code></pre>
1226 ··</section>1226 ··</section>
1227 </section>1227 </section>
1228 <section·class="detail"·id="characters_to_nfkd_binary/1">1228 <section·class="detail"·id="characters_to_nfkd_binary/1">
  
1229 ··<div·class="detail-header">1229 ··<div·class="detail-header">
1230 ····<a·href="#characters_to_nfkd_binary/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1230 ····<a·href="#characters_to_nfkd_binary/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 1251, 16 lines modifiedOffset 1251, 16 lines modified
  
1251 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfkd_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>1251 ··········<pre·translate="no"><span·class="attribute">-spec</span>·characters_to_nfkd_binary(<a·href="#t:chardata/0">chardata</a>())·->·<a·href="#t:unicode_binary/0">unicode_binary</a>()·|·{error,·<a·href="#t:unicode_binary/0">unicode_binary</a>(),·<a·href="#t:chardata/0">chardata</a>()}.</pre>
  
1252 ······</div>1252 ······</div>
  
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Offset 335, 28 lines modifiedOffset 335, 28 lines modified
335 communicating·externally.·Functions·and·bit·syntax·exist·to·encode·and·decode335 communicating·externally.·Functions·and·bit·syntax·exist·to·encode·and·decode
336 both·UTF-8,·UTF-16,·and·UTF-32·in·binaries.·However,·library·functions·dealing336 both·UTF-8,·UTF-16,·and·UTF-32·in·binaries.·However,·library·functions·dealing
337 with·binaries·and·Unicode·in·general·only·deal·with·the·default·encoding.</p><p>Character·data·can·be·combined·from·many·sources,·sometimes·available·in·a·mix337 with·binaries·and·Unicode·in·general·only·deal·with·the·default·encoding.</p><p>Character·data·can·be·combined·from·many·sources,·sometimes·available·in·a·mix
338 of·strings·and·binaries.·Erlang·has·for·long·had·the·concept·of·<code·class="inline">iodata</code>·or338 of·strings·and·binaries.·Erlang·has·for·long·had·the·concept·of·<code·class="inline">iodata</code>·or
339 <code·class="inline">iolist</code>s,·where·binaries·and·lists·can·be·combined·to·represent·a·sequence·of339 <code·class="inline">iolist</code>s,·where·binaries·and·lists·can·be·combined·to·represent·a·sequence·of
340 bytes.·In·the·same·way,·the·Unicode-aware·modules·often·allow·for·combinations340 bytes.·In·the·same·way,·the·Unicode-aware·modules·often·allow·for·combinations
341 of·binaries·and·lists,·where·the·binaries·have·characters·encoded·in·UTF-8·and341 of·binaries·and·lists,·where·the·binaries·have·characters·encoded·in·UTF-8·and
342 the·lists·contain·such·binaries·or·numbers·representing·Unicode·code·points:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">unicode_binary</span><span·class="p"·data-group-id="7195640525-1">(</span><span·class="p"·data-group-id="7195640525-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="7195640525-2">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·1660e57115fbaf380a7d109c519454560fc721767a9a0265293da9f5bb4daaaa·...·]-2">)</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="ss">characters</span><span·class="w">·</span><span·class="ss">encoded</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">8</span><span·class="w">·</span><span·class="ss">coding</span><span·class="w">·</span><span·class="ss">standard</span><span·class="w">342 the·lists·contain·such·binaries·or·numbers·representing·Unicode·code·points:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">unicode_binary</span><span·class="p"·data-group-id="3893105736-1">(</span><span·class="p"·data-group-id="3893105736-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="3893105736-2">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·6fa5207339ae831a43a7928aad2c08b2311778af3d1e6a8f2a6fcf273d547ff4·...·]-2">)</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="ss">characters</span><span·class="w">·</span><span·class="ss">encoded</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">8</span><span·class="w">·</span><span·class="ss">coding</span><span·class="w">·</span><span·class="ss">standard</span><span·class="w">
  
343 </span><span·class="nf">chardata</span><span·class="p"·data-group-id="7195640525-3">(</span><span·class="p"·data-group-id="7195640525-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">charlist</span><span·class="p"·data-group-id="7195640525-4">(</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·233,·SHA:·423eb1774b564914e330211e713018bc20d3dc8c85e01b3bb1a611812a75d36e·...·]-5">)</span><span·class="w">343 </span><span·class="nf">chardata</span><span·class="p"·data-group-id="3893105736-3">(</span><span·class="p"·data-group-id="3893105736-3">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">charlist</span><span·class="p"·data-group-id="3893105736-4">(</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·233,·SHA:·816039d58e5554bfc97898a0183e0f4168fb1dea5420f463dd16169cbe511575·...·]-5">)</span><span·class="w">
  
344 </span><span·class="nf">charlist</span><span·class="p"·data-group-id="7195640525-6">(</span><span·class="p"·data-group-id="7195640525-6">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">maybe_improper_list</span><span·class="p"·data-group-id="7195640525-7">(</span><span·class="[·...·truncated·by·diffoscope;·len:·536,·SHA:·7cf0e9c630818ca99e6eed64f563cc5a2a309b6f8a9c33fd67a8b25a75e8991e·...·]-10">)</span><span·class="p">,</span><span·class="w">344 </span><span·class="nf">charlist</span><span·class="p"·data-group-id="3893105736-6">(</span><span·class="p"·data-group-id="3893105736-6">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">maybe_improper_list</span><span·class="p"·data-group-id="3893105736-7">(</span><span·class="[·...·truncated·by·diffoscope;·len:·536,·SHA:·c9a18d193d6c21cc7f1c9e8861859b784238d2e5c4febc8834bbaaae220c8f07·...·]-10">)</span><span·class="p">,</span><span·class="w">
345 ··</span><span·class="nf">unicode_binary</span><span·class="p"·data-group-id="7195640525-11">(</span><span·class="p"·data-group-id="7195640525-11">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">nil</span><span·class="p"·data-group-id="7195640525-12">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·69,·SHA:·c5e423afed1ba2b116f27e00828293c1bc0e28280e2dc86b091b0ddf0e081ef7·...·]-7">)</span></code></pre><p>The·module·<a·href="unicode.html"><code·class="inline">unicode</code></a>·even·supports·similar·mixes·with·binaries·containing345 ··</span><span·class="nf">unicode_binary</span><span·class="p"·data-group-id="3893105736-11">(</span><span·class="p"·data-group-id="3893105736-11">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="nf">nil</span><span·class="p"·data-group-id="3893105736-12">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·69,·SHA:·be9f4ee8b6551746505ebe586d6dc426b20f7046a418fb5a8cd330dab278b3d2·...·]-7">)</span></code></pre><p>The·module·<a·href="unicode.html"><code·class="inline">unicode</code></a>·even·supports·similar·mixes·with·binaries·containing
346 other·encodings·than·UTF-8,·but·that·is·a·special·case·to·allow·for·conversions346 other·encodings·than·UTF-8,·but·that·is·a·special·case·to·allow·for·conversions
347 to·and·from·external·data:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">external_unicode_binary</span><span·class="p"·data-group-id="9441147707-1">(</span><span·class="p"·data-group-id="9441147707-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="9441147707-2">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·14,·SHA:·dced5f2fc5b233b5ea573827cd587eb92d3798931438f031e109de04a72da104·...·]7-2">)</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="ss">characters</span><span·class="w">·</span><span·class="ss">coded</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">a</span><span·class="w">·</span><span·class="ss">user</span><span·class="o">-</span><span·class="ss">specified</span><span·class="w">347 to·and·from·external·data:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">external_unicode_binary</span><span·class="p"·data-group-id="3922755357-1">(</span><span·class="p"·data-group-id="3922755357-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">binary</span><span·class="p"·data-group-id="3922755357-2">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·14,·SHA:·6d36d1d03390fd0f1a9d93e5b98bf429330a488b0821abfd98095fd7071a9055·...·]7-2">)</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="ss">characters</span><span·class="w">·</span><span·class="ss">coded</span><span·class="w">·</span><span·class="ss">in</span><span·class="w">·</span><span·class="ss">a</span><span·class="w">·</span><span·class="ss">user</span><span·class="o">-</span><span·class="ss">specified</span><span·class="w">
348 ··</span><span·class="n">Unicode</span><span·class="w">·</span><span·class="ss">encoding</span><span·class="w">·</span><span·class="ss">other</span><span·class="w">·</span><span·class="ss">than</span><span·class="w">·</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">8</span><span·class="w">·</span><span·class="p"·data-group-id="9441147707-3">(</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">16</span><span·class="w">·</span><span·class="ow">or</span><span·class="w">·</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">32</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·d8e5af384e7965e3c81f83fe38eaac9867908196fdec5c39570451517769493e·...·]7-3">)</span><span·class="w">348 ··</span><span·class="n">Unicode</span><span·class="w">·</span><span·class="ss">encoding</span><span·class="w">·</span><span·class="ss">other</span><span·class="w">·</span><span·class="ss">than</span><span·class="w">·</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">8</span><span·class="w">·</span><span·class="p"·data-group-id="3922755357-3">(</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">16</span><span·class="w">·</span><span·class="ow">or</span><span·class="w">·</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">32</span><span·cl[·...·truncated·by·diffoscope;·len:·32,·SHA:·dafcebbdb840b0703425f04e1cb08b7667c90e8b407dd524078c9651e484e6ce·...·]7-3">)</span><span·class="w">
  
349 </span><span·class="nf">external_chardata</span><span·class="p"·data-group-id="9441147707-4">(</span><span·class="p"·data-group-id="9441147707-4">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">external_charlist</span><span·class="p"·data-group-id="9441147707-5">(</span><span·class="p"[·...·truncated·by·diffoscope;·len:·250,·SHA:·00e1aee2abe72ab286073d892b6db1156354f00d40b0ffbd88eb7d00010aaff1·...·]7-6">)</span><span·class="w">349 </span><span·class="nf">external_chardata</span><span·class="p"·data-group-id="3922755357-4">(</span><span·class="p"·data-group-id="3922755357-4">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">external_charlist</span><span·class="p"·data-group-id="3922755357-5">(</span><span·class="p"[·...·truncated·by·diffoscope;·len:·250,·SHA:·1928544a9788c3d09038341860145a9e74d2a33d8179ea37d05e57f1b22c86b6·...·]7-6">)</span><span·class="w">
  
350 </span><span·class="nf">external_charlist</span><span·class="p"·data-group-id="9441147707-7">(</span><span·class="p"·data-group-id="9441147707-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">maybe_improper_list</span><span·class="p"·data-group-id="9441147707-8">(</span><span·class="[·...·truncated·by·diffoscope;·len:·334,·SHA:·d1e7c06c93894df8362a0a2e59be220d2cfdd569303f26787c39c1c58f9ba468·...·]7-10">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">350 </span><span·class="nf">external_charlist</span><span·class="p"·data-group-id="3922755357-7">(</span><span·class="p"·data-group-id="3922755357-7">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">maybe_improper_list</span><span·class="p"·data-group-id="3922755357-8">(</span><span·class="[·...·truncated·by·diffoscope;·len:·334,·SHA:·847568a92fb9d05ee136b64bc9c014a16687f5f4defd2695383b617e39291d5e·...·]7-10">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
351 ··</span><span·class="nf">external_charlist</span><span·class="p"·data-group-id="9441147707-11">(</span><span·class="p"·data-group-id="9441147707-11">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">external_unicode_binary</span><span·class="p"·data-group-id="9441147707-12">(</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·271,·SHA:·abefbf9ed547fa531fe2ff918c23f048f0409d12db44c8d84e2857d1eed10d59·...·]7-8">)</span></code></pre><h2·id="basic-language-support"·class="section-heading">351 ··</span><span·class="nf">external_charlist</span><span·class="p"·data-group-id="3922755357-11">(</span><span·class="p"·data-group-id="3922755357-11">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">external_unicode_binary</span><span·class="p"·data-group-id="3922755357-12">(</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·271,·SHA:·c592e7edb54bafe8e31ec8feb9f9fadfd4a8d7a1357609f8d5f6e5d4d09517e2·...·]7-8">)</span></code></pre><h2·id="basic-language-support"·class="section-heading">
352 ··<a·href="#basic-language-support"·class="hover-link">352 ··<a·href="#basic-language-support"·class="hover-link">
353 ····<i·class="ri-link-m"·aria-hidden="true"></i>353 ····<i·class="ri-link-m"·aria-hidden="true"></i>
354 ··</a>354 ··</a>
355 ··<span·class="text">Basic·Language·Support</span>355 ··<span·class="text">Basic·Language·Support</span>
356 </h2>356 </h2>
357 <p><a·href=""·id="unicode_in_erlang"></a>·As·from·Erlang/OTP·R16,·Erlang·source·files·can·be357 <p><a·href=""·id="unicode_in_erlang"></a>·As·from·Erlang/OTP·R16,·Erlang·source·files·can·be
358 written·in·UTF-8·or·bytewise·(<code·class="inline">latin1</code>)·encoding.·For·information·about·how·to358 written·in·UTF-8·or·bytewise·(<code·class="inline">latin1</code>)·encoding.·For·information·about·how·to
Offset 396, 78 lines modifiedOffset 396, 78 lines modified
396 ··<a·href="#heuristic-string-detection"·class="hover-link">396 ··<a·href="#heuristic-string-detection"·class="hover-link">
397 ····<i·class="ri-link-m"·aria-hidden="true"></i>397 ····<i·class="ri-link-m"·aria-hidden="true"></i>
398 ··</a>398 ··</a>
399 ··<span·class="text">Heuristic·String·Detection</span>399 ··<span·class="text">Heuristic·String·Detection</span>
400 </h3>400 </h3>
401 <p>In·certain·output·functions·and·in·the·output·of·return·values·in·the·shell,401 <p>In·certain·output·functions·and·in·the·output·of·return·values·in·the·shell,
402 Erlang·tries·to·detect·string·data·in·lists·and·binaries·heuristically.402 Erlang·tries·to·detect·string·data·in·lists·and·binaries·heuristically.
403 Typically·you·will·see·heuristic·detection·in·a·situation·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="8247993055-1">[</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p"·data-group-id="8247993055-1">]</span><span·class="p">.</span><span·class="w">403 Typically·you·will·see·heuristic·detection·in·a·situation·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="p"·data-group-id="1657673071-1">[</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p"·data-group-id="1657673071-1">]</span><span·class="p">.</span><span·class="w">
404 </span><span·class="s">&quot;abc&quot;</span><span·class="gp·unselectable">404 </span><span·class="s">&quot;abc&quot;</span><span·class="gp·unselectable">
405 2&gt;·</span><span·class="p"·data-group-id="8247993055-2">&lt;&lt;</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p"·data-group-id="8247993055-2">&gt;&gt;</span><span·class="p">.</span><span·class="w">405 2&gt;·</span><span·class="p"·data-group-id="1657673071-2">&lt;&lt;</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">98</span><span·class="p">,</span><span·class="mi">99</span><span·class="p"·data-group-id="1657673071-2">&gt;&gt;</span><span·class="p">.</span><span·class="w">
406 </span><span·class="p"·data-group-id="8247993055-3">&lt;&lt;</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="8247993055-3">&gt;&gt;</span><span·class="gp·unselectable">406 </span><span·class="p"·data-group-id="1657673071-3">&lt;&lt;</span><span·class="s">&quot;abc&quot;</span><span·class="p"·data-group-id="1657673071-3">&gt;&gt;</span><span·class="gp·unselectable">
407 3&gt;·</span><span·class="p"·data-group-id="8247993055-4">&lt;&lt;</span><span·class="mi">195</span><span·class="p">,</span><span·class="mi">165</span><span·class="p">,</span><span·class="mi">195</span><span·class="p">,</span><span·class="mi">164</span><span·class="p">,</span><span·class="mi">195</s[·...·truncated·by·diffoscope;·len:·96,·SHA:·0ccffde16e3cc99be9e22f58ca8aca741feaf35bdd3ee72bc8aa139107fb77d6·...·]-4">&gt;&gt;</span><span·class="p">.</span><span·class="w">407 3&gt;·</span><span·class="p"·data-group-id="1657673071-4">&lt;&lt;</span><span·class="mi">195</span><span·class="p">,</span><span·class="mi">165</span><span·class="p">,</span><span·class="mi">195</span><span·class="p">,</span><span·class="mi">164</span><span·class="p">,</span><span·class="mi">195</s[·...·truncated·by·diffoscope;·len:·96,·SHA:·7a8e87d5b5a668f6a4f55626ff840a26ec9125d376a5583682ce21d1024e5f77·...·]-4">&gt;&gt;</span><span·class="p">.</span><span·class="w">
408 </span><span·class="p"·data-group-id="8247993055-5">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="8247993055-5">&gt;&gt;</span></code></pre><p>Here·the·shell·detects·lists·containing·printable·characters·or·binaries408 </span><span·class="p"·data-group-id="1657673071-5">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="1657673071-5">&gt;&gt;</span></code></pre><p>Here·the·shell·detects·lists·containing·printable·characters·or·binaries
409 containing·printable·characters·in·bytewise·or·UTF-8·encoding.·But·what·is·a409 containing·printable·characters·in·bytewise·or·UTF-8·encoding.·But·what·is·a
410 printable·character?·One·view·is·that·anything·the·Unicode·standard·thinks·is410 printable·character?·One·view·is·that·anything·the·Unicode·standard·thinks·is
411 printable,·is·also·printable·according·to·the·heuristic·detection.·The·result·is411 printable,·is·also·printable·according·to·the·heuristic·detection.·The·result·is
412 then·that·almost·any·list·of·integers·are·deemed·a·string,·and·all·sorts·of412 then·that·almost·any·list·of·integers·are·deemed·a·string,·and·all·sorts·of
413 characters·are·printed,·maybe·also·characters·that·your·terminal·lacks·in·its413 characters·are·printed,·maybe·also·characters·that·your·terminal·lacks·in·its
414 font·set·(resulting·in·some·unappreciated·generic·output).·Another·way·is·to414 font·set·(resulting·in·some·unappreciated·generic·output).·Another·way·is·to
415 keep·it·backward·compatible·so·that·only·the·ISO·Latin-1·character·set·is·used415 keep·it·backward·compatible·so·that·only·the·ISO·Latin-1·character·set·is·used
416 to·detect·a·string.·A·third·way·is·to·let·the·user·decide·exactly·what·Unicode416 to·detect·a·string.·A·third·way·is·to·let·the·user·decide·exactly·what·Unicode
417 ranges·that·are·to·be·viewed·as·characters.</p><p>As·from·Erlang/OTP·R16B·you·can·select·the·ISO·Latin-1·range·or·the·whole417 ranges·that·are·to·be·viewed·as·characters.</p><p>As·from·Erlang/OTP·R16B·you·can·select·the·ISO·Latin-1·range·or·the·whole
418 Unicode·range·by·supplying·startup·flag·<code·class="inline">+pc·latin1</code>·or·<code·class="inline">+pc·unicode</code>,418 Unicode·range·by·supplying·startup·flag·<code·class="inline">+pc·latin1</code>·or·<code·class="inline">+pc·unicode</code>,
419 respectively.·For·backward·compatibility,·<code·class="inline">latin1</code>·is·default.·This·only419 respectively.·For·backward·compatibility,·<code·class="inline">latin1</code>·is·default.·This·only
420 controls·how·heuristic·string·detection·is·done.·More·ranges·are·expected·to·be420 controls·how·heuristic·string·detection·is·done.·More·ranges·are·expected·to·be
421 added·in·the·future,·enabling·tailoring·of·the·heuristics·to·the·language·and421 added·in·the·future,·enabling·tailoring·of·the·heuristics·to·the·language·and
422 region·relevant·to·the·user.</p><p>The·following·examples·show·the·two·startup·options:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="w">422 region·relevant·to·the·user.</p><p>The·following·examples·show·the·two·startup·options:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="w">
423 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="1807754115-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="1807754115-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·467bc63e957cd3fadf8b0452796663ebc10cb8be795ec1ca52c282d183a062c7·...·]-5">]</span><span·class="w">423 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="2815538064-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="2815538064-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·f9b1dd76e0efc353be02acfc7d0e7ff3035cd2b5628f1f774d8e0f7591f793be·...·]-5">]</span><span·class="w">
  
424 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="1807754115-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="1807754115-6">)</span><span·class="gp·unselectable">424 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="2815538064-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="2815538064-6">)</span><span·class="gp·unselectable">
425 1&gt;·</span><span·class="p"·data-group-id="1807754115-7">[</span><span·class="mi">1024</span><span·class="p"·data-group-id="1807754115-7">]</span><span·class="p">.</span><span·class="w">425 1&gt;·</span><span·class="p"·data-group-id="2815538064-7">[</span><span·class="mi">1024</span><span·class="p"·data-group-id="2815538064-7">]</span><span·class="p">.</span><span·class="w">
426 </span><span·class="p"·data-group-id="1807754115-8">[</span><span·class="mi">1024</span><span·class="p"·data-group-id="1807754115-8">]</span><span·class="gp·unselectable">426 </span><span·class="p"·data-group-id="2815538064-8">[</span><span·class="mi">1024</span><span·class="p"·data-group-id="2815538064-8">]</span><span·class="gp·unselectable">
427 2&gt;·</span><span·class="p"·data-group-id="1807754115-9">[</span><span·class="mi">1070</span><span·class="p">,</span><span·class="mi">1085</span><span·class="p">,</span><span·class="mi">1080</span><span·class="p">,</span><span·class="mi">1082</span><span·class="p">,</span><span·class="mi">1086</spa[·...·truncated·by·diffoscope;·len:·95,·SHA:·be137b40f58d21aedbf6d04907cf36a820272dcb7f1adcb21a6047fc28a4bcde·...·]-9">]</span><span·class="p">.</span><span·class="w">427 2&gt;·</span><span·class="p"·data-group-id="2815538064-9">[</span><span·class="mi">1070</span><span·class="p">,</span><span·class="mi">1085</span><span·class="p">,</span><span·class="mi">1080</span><span·class="p">,</span><span·class="mi">1082</span><span·class="p">,</span><span·class="mi">1086</spa[·...·truncated·by·diffoscope;·len:·95,·SHA:·cf42300d10db29c8c3810db7577f14a24364d90e4d7c81e634e47ad1ca4f7787·...·]-9">]</span><span·class="p">.</span><span·class="w">
428 </span><span·class="p"·data-group-id="1807754115-10">[</span><span·class="mi">1070</span><span·class="p">,</span><span·class="mi">1085</span><span·class="p">,</span><span·class="mi">1080</span><span·class="p">,</span><span·class="mi">1082</span><span·class="p">,</span><span·class="mi">1086</sp[·...·truncated·by·diffoscope;·len:·96,·SHA:·6a306389a9756f524c6e8aa2ddaa8b5335aad9d596f3900361c44dc5a370aad0·...·]-10">]</span><span·class="gp·unselectable">428 </span><span·class="p"·data-group-id="2815538064-10">[</span><span·class="mi">1070</span><span·class="p">,</span><span·class="mi">1085</span><span·class="p">,</span><span·class="mi">1080</span><span·class="p">,</span><span·class="mi">1082</span><span·class="p">,</span><span·class="mi">1086</sp[·...·truncated·by·diffoscope;·len:·96,·SHA:·23af277c16077f7011abcce5d7c5940ef900769606c19d4f35e87fdb2dd6df36·...·]-10">]</span><span·class="gp·unselectable">
429 3&gt;·</span><span·class="p"·data-group-id="1807754115-11">[</span><span·class="mi">229</span><span·class="p">,</span><span·class="mi">228</span><span·class="p">,</span><span·class="mi">246</span><span·class="p"·data-group-id="1807754115-11">]</span><span·class="p">.</span><span·class="w">429 3&gt;·</span><span·class="p"·data-group-id="2815538064-11">[</span><span·class="mi">229</span><span·class="p">,</span><span·class="mi">228</span><span·class="p">,</span><span·class="mi">246</span><span·class="p"·data-group-id="2815538064-11">]</span><span·class="p">.</span><span·class="w">
430 </span><span·class="s">&quot;åäö&quot;</span><span·class="gp·unselectable">430 </span><span·class="s">&quot;åäö&quot;</span><span·class="gp·unselectable">
431 4&gt;·</span><span·class="p"·data-group-id="1807754115-12">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</[·...·truncated·by·diffoscope;·len:·403,·SHA:·c023d1d1d14c66f726f4d8c3fe3186b7203cb037a0be4262052276bdb42915cc·...·]-12">&gt;&gt;</span><span·class="p">.</span><span·class="w">431 4&gt;·</span><span·class="p"·data-group-id="2815538064-12">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</[·...·truncated·by·diffoscope;·len:·403,·SHA:·b4592fe2b9ae5533336837cff28e415d8426de66c2b840ca53c1a7f4922e7cca·...·]-12">&gt;&gt;</span><span·class="p">.</span><span·class="w">
432 </span><span·class="p"·data-group-id="1807754115-13">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</[·...·truncated·by·diffoscope;·len:·403,·SHA:·c023d1d1d14c66f726f4d8c3fe3186b7203cb037a0be4262052276bdb42915cc·...·]-13">&gt;&gt;</span><span·class="gp·unselectable">432 </span><span·class="p"·data-group-id="2815538064-13">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</[·...·truncated·by·diffoscope;·len:·403,·SHA:·b4592fe2b9ae5533336837cff28e415d8426de66c2b840ca53c1a7f4922e7cca·...·]-13">&gt;&gt;</span><span·class="gp·unselectable">
433 5&gt;·</span><span·class="p"·data-group-id="1807754115-14">&lt;&lt;</span><span·class="mi">229</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">228</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">246[·...·truncated·by·diffoscope;·len:·100,·SHA:·0e38580428dba2e0837d6976e11cdc6d303a92ec2d8d12466b717ca455f402cc·...·]-14">&gt;&gt;</span><span·class="p">.</span><span·class="w">433 5&gt;·</span><span·class="p"·data-group-id="2815538064-14">&lt;&lt;</span><span·class="mi">229</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">228</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">246[·...·truncated·by·diffoscope;·len:·100,·SHA:·f3b58e366d53f46d03b40c0eca4f1519341dc97e7fbde4d32cb1acf5fe12e1dd·...·]-14">&gt;&gt;</span><span·class="p">.</span><span·class="w">
434 </span><span·class="p"·data-group-id="1807754115-15">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="1807754115-15">&gt;&gt;</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">unicode</span><span·class="w">434 </span><span·class="p"·data-group-id="2815538064-15">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="2815538064-15">&gt;&gt;</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">unicode</span><span·class="w">
435 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="7723603090-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="7723603090-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·741bba6d01784e7a3dbefe1eb8894b3c13cef836c393c3386d8e992686f06935·...·]-5">]</span><span·class="w">435 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="5304369258-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="5304369258-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·751c4e38136ea8d14cc0a337b3cfef4bb6d12be94c093971183401956c695615·...·]-5">]</span><span·class="w">
  
436 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="7723603090-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7723603090-6">)</span><span·class="gp·unselectable">436 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="5304369258-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="5304369258-6">)</span><span·class="gp·unselectable">
437 1&gt;·</span><span·class="p"·data-group-id="7723603090-7">[</span><span·class="mi">1024</span><span·class="p"·data-group-id="7723603090-7">]</span><span·class="p">.</span><span·class="w">437 1&gt;·</span><span·class="p"·data-group-id="5304369258-7">[</span><span·class="mi">1024</span><span·class="p"·data-group-id="5304369258-7">]</span><span·class="p">.</span><span·class="w">
438 </span><span·class="s">&quot;Ѐ&quot;</span><span·class="gp·unselectable">438 </span><span·class="s">&quot;Ѐ&quot;</span><span·class="gp·unselectable">
439 2&gt;·</span><span·class="p"·data-group-id="7723603090-8">[</span><span·class="mi">1070</span><span·class="p">,</span><span·class="mi">1085</span><span·class="p">,</span><span·class="mi">1080</span><span·class="p">,</span><span·class="mi">1082</span><span·class="p">,</span><span·class="mi">1086</spa[·...·truncated·by·diffoscope;·len:·95,·SHA:·18d3d91d86a6456829e0ce083489a4959e34b4d0cefd5d96d215e4b3609f3f98·...·]-8">]</span><span·class="p">.</span><span·class="w">439 2&gt;·</span><span·class="p"·data-group-id="5304369258-8">[</span><span·class="mi">1070</span><span·class="p">,</span><span·class="mi">1085</span><span·class="p">,</span><span·class="mi">1080</span><span·class="p">,</span><span·class="mi">1082</span><span·class="p">,</span><span·class="mi">1086</spa[·...·truncated·by·diffoscope;·len:·95,·SHA:·0beb4d22888c5542bdec4a1703dff26431778ea981bee39d10d8e3be18228f26·...·]-8">]</span><span·class="p">.</span><span·class="w">
440 </span><span·class="s">&quot;Юникод&quot;</span><span·class="gp·unselectable">440 </span><span·class="s">&quot;Юникод&quot;</span><span·class="gp·unselectable">
441 3&gt;·</span><span·class="p"·data-group-id="7723603090-9">[</span><span·class="mi">229</span><span·class="p">,</span><span·class="mi">228</span><span·class="p">,</span><span·class="mi">246</span><span·class="p"·data-group-id="7723603090-9">]</span><span·class="p">.</span><span·class="w">441 3&gt;·</span><span·class="p"·data-group-id="5304369258-9">[</span><span·class="mi">229</span><span·class="p">,</span><span·class="mi">228</span><span·class="p">,</span><span·class="mi">246</span><span·class="p"·data-group-id="5304369258-9">]</span><span·class="p">.</span><span·class="w">
442 </span><span·class="s">&quot;åäö&quot;</span><span·class="gp·unselectable">442 </span><span·class="s">&quot;åäö&quot;</span><span·class="gp·unselectable">
443 4&gt;·</span><span·class="p"·data-group-id="7723603090-10">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</[·...·truncated·by·diffoscope;·len:·403,·SHA:·89fe642f7ef41f7d2c20479745df7c3cb441ed7ba50f816caffe132b8b4dacbd·...·]-10">&gt;&gt;</span><span·class="p">.</span><span·class="w">443 4&gt;·</span><span·class="p"·data-group-id="5304369258-10">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</[·...·truncated·by·diffoscope;·len:·403,·SHA:·b2e23cd67ce9fe8de085214fc9cfc3347e19173e9f652ae3934c80951358bec4·...·]-10">&gt;&gt;</span><span·class="p">.</span><span·class="w">
444 </span><span·class="p"·data-group-id="7723603090-11">&lt;&lt;</span><span·class="s">&quot;Юникод&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="7723603090-11">&gt;&gt;</span><span·class="gp·unselectable">444 </span><span·class="p"·data-group-id="5304369258-11">&lt;&lt;</span><span·class="s">&quot;Юникод&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="5304369258-11">&gt;&gt;</span><span·class="gp·unselectable">
445 5&gt;·</span><span·class="p"·data-group-id="7723603090-12">&lt;&lt;</span><span·class="mi">229</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">228</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">246[·...·truncated·by·diffoscope;·len:·100,·SHA:·0d60cc288f3a72543c9f2c1514bda6e59bf8a90e5c45911d656da3b010c68902·...·]-12">&gt;&gt;</span><span·class="p">.</span><span·class="w">445 5&gt;·</span><span·class="p"·data-group-id="5304369258-12">&lt;&lt;</span><span·class="mi">229</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">228</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p">,</span><span·class="mi">246[·...·truncated·by·diffoscope;·len:·100,·SHA:·7fa79becdd8b2ee9704caff0d835d7fa90dd94431bd8a7099cf968c782823e8a·...·]-12">&gt;&gt;</span><span·class="p">.</span><span·class="w">
446 </span><span·class="p"·data-group-id="7723603090-13">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="7723603090-13">&gt;&gt;</span></code></pre><p>In·the·examples,·you·can·see·that·the·default·Erlang·shell·interprets·only446 </span><span·class="p"·data-group-id="5304369258-13">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="5304369258-13">&gt;&gt;</span></code></pre><p>In·the·examples,·you·can·see·that·the·default·Erlang·shell·interprets·only
447 characters·from·the·ISO·Latin1·range·as·printable·and·only·detects·lists·or447 characters·from·the·ISO·Latin1·range·as·printable·and·only·detects·lists·or
448 binaries·with·those·&quot;printable&quot;·characters·as·containing·string·data.·The·valid448 binaries·with·those·&quot;printable&quot;·characters·as·containing·string·data.·The·valid
449 UTF-8·binary·containing·the·Russian·word·&quot;Юникод&quot;,·is·not·printed·as·a·string.449 UTF-8·binary·containing·the·Russian·word·&quot;Юникод&quot;,·is·not·printed·as·a·string.
450 When·started·with·all·Unicode·characters·printable·(<code·class="inline">+pc·unicode</code>),·the·shell450 When·started·with·all·Unicode·characters·printable·(<code·class="inline">+pc·unicode</code>),·the·shell
451 outputs·anything·containing·printable·Unicode·data·(in·binaries,·either·UTF-8·or451 outputs·anything·containing·printable·Unicode·data·(in·binaries,·either·UTF-8·or
452 bytewise·encoded)·as·string·data.</p><p>These·heuristics·are·also·used·by·<a·href="io.html#format/2"><code·class="inline">io:format/2</code></a>,·<a·href="io_lib.html#format/2"><code·class="inline">io_lib:format/2</code></a>,·and·friends452 bytewise·encoded)·as·string·data.</p><p>These·heuristics·are·also·used·by·<a·href="io.html#format/2"><code·class="inline">io:format/2</code></a>,·<a·href="io_lib.html#format/2"><code·class="inline">io_lib:format/2</code></a>,·and·friends
453 when·modifier·<code·class="inline">t</code>·is·used·with·<code·class="inline">~p</code>·or·<code·class="inline">~P</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="w">453 when·modifier·<code·class="inline">t</code>·is·used·with·<code·class="inline">~p</code>·or·<code·class="inline">~P</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="w">
454 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="8053562339-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="8053562339-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·ee57cb37e91ae05241d4b99e2b8726f0bc972e394e6797ee92dc51212519b9c9·...·]-5">]</span><span·class="w">454 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="0516624815-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="0516624815-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·84d64cf1d38fa219e52aad3443a639ff334751c7b72667071bb98a11e04bc303·...·]-5">]</span><span·class="w">
  
455 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="8053562339-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="8053562339-6">)</span><span·class="gp·unselectable">455 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="0516624815-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0516624815-6">)</span><span·class="gp·unselectable">
456 1&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8053562339-7">(</span><span·class="s">&quot;~tp</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8053562339-8">[</span><span·class="p"·data-group-id="8053562339-9">{</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·1308,·SHA:·2c1460b5e0f7180c5ea0c1afc4c028fcbe6504f1b9eefbb1368b04c7ffd00b2a·...·]-7">)</span><span·class="p">.</span><span·class="w">456 1&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0516624815-7">(</span><span·class="s">&quot;~tp</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0516624815-8">[</span><span·class="p"·data-group-id="0516624815-9">{</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·1308,·SHA:·02ba4b187668663d989ac2552fd357a560228939767c7e2bb733bc8044eeb06b·...·]-7">)</span><span·class="p">.</span><span·class="w">
457 </span><span·class="p"·data-group-id="8053562339-13">{</span><span·class="p"·data-group-id="8053562339-14">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="p"·data-group-id="8053562339-14">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="8053562339-15">&lt[·...·truncated·by·diffoscope;·len:·938,·SHA:·0c3d16163fddbc62058faccdab3a084a9ab51bac78aafee73657537c03de70ca·...·]-13">}</span><span·class="w">457 </span><span·class="p"·data-group-id="0516624815-13">{</span><span·class="p"·data-group-id="0516624815-14">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="p"·data-group-id="0516624815-14">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="0516624815-15">&lt[·...·truncated·by·diffoscope;·len:·938,·SHA:·59796e5de66868480a6e62fc9ac1448f8a1aec7a133d83e15f095e5a6da2e850·...·]-13">}</span><span·class="w">
458 </span><span·class="ss">ok</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">unicode</span><span·class="w">458 </span><span·class="ss">ok</span></code></pre><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="ss">erl</span><span·class="w">·</span><span·class="o">+</span><span·class="ss">pc</span><span·class="w">·</span><span·class="ss">unicode</span><span·class="w">
459 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="3205594870-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="3205594870-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·3572aaa739192f49080aa7816cb04c4f001c35a45c87d0bd0894a69b605db18c·...·]-5">]</span><span·class="w">459 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="0624416254-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="0624416254-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·782,·SHA:·00082bdc88f7721a4d55798c1d38f108499a6df83e9913ccdd646c5c2698de03·...·]-5">]</span><span·class="w">
  
460 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="3205594870-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="3205594870-6">)</span><span·class="gp·unselectable">460 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="0624416254-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="0624416254-6">)</span><span·class="gp·unselectable">
461 1&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3205594870-7">(</span><span·class="s">&quot;~tp</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="3205594870-8">[</span><span·class="p"·data-group-id="3205594870-9">{</span><span·class="p"·data-group-id="3205594870-10">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="p"·data-group-id="3205594870-10">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3205594870-11">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="3205594870-11">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3205594870-12">&lt;&lt;</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">174</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">189</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">184</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">186</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">190</span><span·class="p">,</span><span·class="mi">208</span><span·class="p">,</span><span·class="mi">180</span><span·class="p"·data-group-id="3205594870-12">&gt;&gt;</span><span·class="p"·data-group-id="3205594870-9">}</span><span·class="p"·data-group-id="3205594870-8">]</span><span·class="p"·data-group-id="3205594870-7">)</span><span·class="p">.</span><span·class="w"> 
462 </span><span·class="p"·data-group-id="3205594870-13">{</span><span·class="p"·data-group-id="3205594870-14">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="p"·data-group-id="3205594870-14">&gt;&gt;</span><span·class="p">,</span><span·class[·...·truncated·by·diffoscope;·len:·487,·SHA:·21c5897c11afd271bf9ede2e4852afaf75978902be3f2900757b156629941aa5·...·]</span><span·class="w">461 1&gt;·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0624416254-7">(</span><span·class="s">&quot;~tp</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span[·...·truncated·by·diffoscope;·len:·1461,·SHA:·4e19e196dac2d1429ea804004431121ffbfe426eb4cbc8a454b25b809c6038f5·...·]</span><span·class="w">
 462 </span><span·class="p"·data-group-id="0624416254-13">{</span><span·class="p"·data-group-id="0624416254-14">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="p"·data-group-id="0624416254-14">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="0624416254-15">&lt;&lt;</span><span·class="s">&quot;åäö&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="0624416254-15">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="0624416254-16">&lt;&lt;</span><span·class="s">&quot;Юникод&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="0624416254-16">&gt;&gt;</span><span·class="p"·data-group-id="0624416254-13">}</span><span·class="w">
463 </span><span·class="ss">ok</span></code></pre><p>Notice·that·this·only·affects·<em>heuristic</em>·interpretation·of·lists·and·binaries463 </span><span·class="ss">ok</span></code></pre><p>Notice·that·this·only·affects·<em>heuristic</em>·interpretation·of·lists·and·binaries
464 on·output.·For·example,·the·<code·class="inline">~ts</code>·format·sequence·always·outputs·a·valid·list·of464 on·output.·For·example,·the·<code·class="inline">~ts</code>·format·sequence·always·outputs·a·valid·list·of
465 characters,·regardless·of·the·<code·class="inline">+pc</code>·setting,·as·the·programmer·has·explicitly465 characters,·regardless·of·the·<code·class="inline">+pc</code>·setting,·as·the·programmer·has·explicitly
466 requested·string·output.</p><h2·id="the-interactive-shell"·class="section-heading">466 requested·string·output.</p><h2·id="the-interactive-shell"·class="section-heading">
467 ··<a·href="#the-interactive-shell"·class="hover-link">467 ··<a·href="#the-interactive-shell"·class="hover-link">
468 ····<i·class="ri-link-m"·aria-hidden="true"></i>468 ····<i·class="ri-link-m"·aria-hidden="true"></i>
469 ··</a>469 ··</a>
Offset 482, 47 lines modifiedOffset 482, 47 lines modified
482 example,·a·<code·class="inline">LANG</code>·environment·variable·can·be·set·as·follows:</p><pre><code·class="text">$·echo·$LANG482 example,·a·<code·class="inline">LANG</code>·environment·variable·can·be·set·as·follows:</p><pre><code·class="text">$·echo·$LANG
483 en_US.UTF-8</code></pre><p>Most·systems·handle·variable·<code·class="inline">LC_CTYPE</code>·before·<code·class="inline">LANG</code>,·so·if·that·is·set,·it483 en_US.UTF-8</code></pre><p>Most·systems·handle·variable·<code·class="inline">LC_CTYPE</code>·before·<code·class="inline">LANG</code>,·so·if·that·is·set,·it
484 must·be·set·to·<code·class="inline">UTF-8</code>:</p><pre><code·class="text">$·echo·$LC_CTYPE484 must·be·set·to·<code·class="inline">UTF-8</code>:</p><pre><code·class="text">$·echo·$LC_CTYPE
485 en_US.UTF-8</code></pre><p>The·<code·class="inline">LANG</code>·or·<code·class="inline">LC_CTYPE</code>·setting·are·to·be·consistent·with·what·the·terminal·is485 en_US.UTF-8</code></pre><p>The·<code·class="inline">LANG</code>·or·<code·class="inline">LC_CTYPE</code>·setting·are·to·be·consistent·with·what·the·terminal·is
486 capable·of.·There·is·no·portable·way·for·Erlang·to·ask·the·terminal·about·its486 capable·of.·There·is·no·portable·way·for·Erlang·to·ask·the·terminal·about·its
487 UTF-8·capacity,·we·have·to·rely·on·the·language·and·character·type·settings.</p><p>To·investigate·what·Erlang·thinks·about·the·terminal,·the·call487 UTF-8·capacity,·we·have·to·rely·on·the·language·and·character·type·settings.</p><p>To·investigate·what·Erlang·thinks·about·the·terminal,·the·call
488 <a·href="io.html#getopts/1"><code·class="inline">io:getopts()</code></a>·can·be·used·when·the·shell·is·started:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="n">LC_CTYPE</span><span·class="o">=</span><span·class="ss">en_US</span><span·class="p">.</span><span·class="n">ISO</span><span·class="o">-</span><span·class="mi">8859</span><span·class="o">-</span><span·class="mi">1</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">488 <a·href="io.html#getopts/1"><code·class="inline">io:getopts()</code></a>·can·be·used·when·the·shell·is·started:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="sc">$·</span><span·class="n">LC_CTYPE</span><span·class="o">=</span><span·class="ss">en_US</span><span·class="p">.</span><span·class="n">ISO</span><span·class="o">-</span><span·class="mi">8859</span><span·class="o">-</span><span·class="mi">1</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">
489 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="8391486063-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="8391486063-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·781,·SHA:·3995f61fd081c09707518e6dce4b013b4774fb42330bae9b71569227f594b3c6·...·]3-5">]</span><span·class="w">489 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="7425264993-1">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="7425264993-1">)</span><span·class="w">·</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·781,·SHA:·14f42e35dcf6da6df32087cec7cde087742bc7f7d0794712fb49327090c4de24·...·]3-5">]</span><span·class="w">
  
490 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="8391486063-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="8391486063-6">)</span><span·class="gp·unselectable">490 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="7425264993-6">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7425264993-6">)</span><span·class="gp·unselectable">
491 1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keyfind</span><span·class="p"·data-group-id="8391486063-7">(</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">getopts</span>[·...·truncated·by·diffoscope;·len:·146,·SHA:·6cfac3f490064d4e4722985cd56a2ff1464d03ac5e03e9d182cc30332e61c6b4·...·]3-7">)</span><span·class="p">.</span><span·class="w">491 1&gt;·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">keyfind</span><span·class="p"·data-group-id="7425264993-7">(</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">getopts</span>[·...·truncated·by·diffoscope;·len:·146,·SHA:·12b14959aa572706d53febd64ef3df50e3168f8d53a89ff7dd631b49d8c2076d·...·]3-7">)</span><span·class="p">.</span><span·class="w">
492 </span><span·class="p"·data-group-id="8391486063-9">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="ss">latin1</span><span·class="p"·data-group-id="8391486063-9">}</span><span·class="gp·unselectable">492 </span><span·class="p"·data-group-id="7425264993-9">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="ss">latin1</span><span·class="p"·data-group-id="7425264993-9">}</span><span·class="gp·unselectable">
493 2&gt;·</span><span·class="nf">q</span><span·class="p"·data-group-id="8391486063-10">(</span><span·class="p"·data-group-id="8391486063-10">)</span><span·class="p">.</span><span·class="w">493 2&gt;·</span><span·class="nf">q</span><span·class="p"·data-group-id="7425264993-10">(</span><span·class="p"·data-group-id="7425264993-10">)</span><span·class="p">.</span><span·class="w">
494 </span><span·class="ss">ok</span><span·class="w">494 </span><span·class="ss">ok</span><span·class="w">
495 </span><span·class="sc">$·</span><span·class="n">LC_CTYPE</span><span·class="o">=</span><span·class="ss">en_US</span><span·class="p">.</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">8</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">495 </span><span·class="sc">$·</span><span·class="n">LC_CTYPE</span><span·class="o">=</span><span·class="ss">en_US</span><span·class="p">.</span><span·class="n">UTF</span><span·class="o">-</span><span·class="mi">8</span><span·class="w">·</span><span·class="ss">erl</span><span·class="w">
496 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="8391486063-11">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="8391486063-11">)</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·790,·SHA:·df129833e64a50d8b35704c01ade3b2d1e184f84829cb4b5d601456a6769ac84·...·]3-15">]</span><span·class="w">496 </span><span·class="n">Erlang</span><span·class="w">·</span><span·class="n">R16B</span><span·class="w">·</span><span·class="p"·data-group-id="7425264993-11">(</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">5.10</span><span·class="p">.</span><span·class="mi">1</span><span·class="p"·data-group-id="7425264993-11">)</span><span·class="w">·</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·790,·SHA:·df5b203eaaed62bf82d69bc28e8c9799e7f96da1fb85043e411730feb43cf63c·...·]3-15">]</span><span·class="w">
  
497 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="8391486063-16">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="8391486063-16">)</span><span·class="gp·unselectable">497 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V5</span><span·class="p">.</span><span·class="mf">10.1</span><span·class="w">··</span><span·class="p"·data-group-id="7425264993-16">(</span><span·class="ss">abort</span><span·class="w">·</span><span·class="ss">with</span><span·class="w">·</span><span·class="err">^</span><span·class="n">G</span><span·class="p"·data-group-id="7425264993-16">)</span><span·class="gp·unselectable">
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Offset 587, 19 lines modifiedOffset 587, 19 lines modified
587 ···························QueryString·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:error/0">error</a>().</pre>587 ···························QueryString·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:error/0">error</a>().</pre>
  
588 ······</div>588 ······</div>
  
589 <p>Composes·a·form-urlencoded·<code·class="inline">QueryString</code>·based·on·a·<code·class="inline">QueryList</code>,·a·list·of589 <p>Composes·a·form-urlencoded·<code·class="inline">QueryString</code>·based·on·a·<code·class="inline">QueryList</code>,·a·list·of
590 non-percent-encoded·key-value·pairs.</p><p>Form-urlencoding·is·defined·in·section·4.10.21.6·of·the·<a·href="https://www.w3.org/TR/html52/">HTML·5.2</a>590 non-percent-encoded·key-value·pairs.</p><p>Form-urlencoding·is·defined·in·section·4.10.21.6·of·the·<a·href="https://www.w3.org/TR/html52/">HTML·5.2</a>
591 specification·and·in·section·4.10.22.6·of·the·<a·href="https://www.w3.org/TR/html50/">HTML·5.0</a>591 specification·and·in·section·4.10.22.6·of·the·<a·href="https://www.w3.org/TR/html50/">HTML·5.0</a>
592 specification·for·non-UTF-8·encodings.</p><p>See·also·the·opposite·operation·<a·href="#dissect_query/1"><code·class="inline">dissect_query/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="2302768495-1">(</span><span·class="p"·data-group-id="2302768495-2">[</span><span·class="p"·data-group-id="2302768495-3">{</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·355,·SHA:·fd94df5599718c92c663a25e773f28986c0a4fe9a8278340193dcf0078066636·...·]-1">)</span><span·class="p">.</span><span·class="w">592 specification·for·non-UTF-8·encodings.</p><p>See·also·the·opposite·operation·<a·href="#dissect_query/1"><code·class="inline">dissect_query/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="3248227967-1">(</span><span·class="p"·data-group-id="3248227967-2">[</span><span·class="p"·data-group-id="3248227967-3">{</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·355,·SHA:·da0bc4041204046bd75beb345c62dbc89d7c7c12ddd3ae3bb0aa43b00f658159·...·]-1">)</span><span·class="p">.</span><span·class="w">
593 </span><span·class="s">&quot;foo+bar=1&amp;city=%C3%B6rebro&quot;</span><span·class="gp·unselectable">593 </span><span·class="s">&quot;foo+bar=1&amp;city=%C3%B6rebro&quot;</span><span·class="gp·unselectable">
594 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="2302768495-5">(</span><span·class="p"·data-group-id="2302768495-6">[</span><span·class="p"·data-group-id="2302768495-7">{</span><span·class="p"·data-group-id="2302768495-8">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·255,·SHA:·61d1599e9872374121bc68c60add53ee6f7e41c15a15999ff6bc243a9a761a50·...·]-7">}</span><span·class="p">,</span><span·class="gp·unselectable">594 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="3248227967-5">(</span><span·class="p"·data-group-id="3248227967-6">[</span><span·class="p"·data-group-id="3248227967-7">{</span><span·class="p"·data-group-id="3248227967-8">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·255,·SHA:·d84156614c9d76b6173691a627d1df54530fdbf1de2b349c53e20cb12c0e4e34·...·]-7">}</span><span·class="p">,</span><span·class="gp·unselectable">
595 2&gt;·</span><span·class="p"·data-group-id="2302768495-10">{</span><span·class="p"·data-group-id="2302768495-11">&lt;&lt;</span><span·class="s">&quot;city&quot;</span><span·class="p"·data-group-id="2302768495-11">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="2302768495-12">&l[·...·truncated·by·diffoscope;·len:·315,·SHA:·ac30b72af5b074c5c6bddd0ec5b6573bc2c318989c7ca389ebd06aad00856ae0·...·]-5">)</span><span·class="p">.</span><span·class="w">595 2&gt;·</span><span·class="p"·data-group-id="3248227967-10">{</span><span·class="p"·data-group-id="3248227967-11">&lt;&lt;</span><span·class="s">&quot;city&quot;</span><span·class="p"·data-group-id="3248227967-11">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="3248227967-12">&l[·...·truncated·by·diffoscope;·len:·315,·SHA:·4aae2631391ff2742dd0aaf66e29234b522dac416b2937f47a2618d5653dbac0·...·]-5">)</span><span·class="p">.</span><span·class="w">
596 </span><span·class="p"·data-group-id="2302768495-13">&lt;&lt;</span><span·class="s">&quot;foo+bar=1&amp;city=%C3%B6rebro&quot;</span><span·class="p"·data-group-id="2302768495-13">&gt;&gt;</span></code></pre>596 </span><span·class="p"·data-group-id="3248227967-13">&lt;&lt;</span><span·class="s">&quot;foo+bar=1&amp;city=%C3%B6rebro&quot;</span><span·class="p"·data-group-id="3248227967-13">&gt;&gt;</span></code></pre>
597 ··</section>597 ··</section>
598 </section>598 </section>
599 <section·class="detail"·id="compose_query/2">599 <section·class="detail"·id="compose_query/2">
  
600 ··<div·class="detail-header">600 ··<div·class="detail-header">
601 ····<a·href="#compose_query/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">601 ····<a·href="#compose_query/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
602 ······<i·class="ri-link-m"·aria-hidden="true"></i>602 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 632, 20 lines modifiedOffset 632, 20 lines modified
632 algorithm.</p><p>There·are·two·supported·encodings:·<code·class="inline">utf8</code>·(or·<code·class="inline">unicode</code>)·and·<code·class="inline">latin1</code>.</p><p>Each·character·in·the·entry's·name·and·value·that·cannot·be·expressed·using·the632 algorithm.</p><p>There·are·two·supported·encodings:·<code·class="inline">utf8</code>·(or·<code·class="inline">unicode</code>)·and·<code·class="inline">latin1</code>.</p><p>Each·character·in·the·entry's·name·and·value·that·cannot·be·expressed·using·the
633 selected·character·encoding,·is·replaced·by·a·string·consisting·of·a·U+0026633 selected·character·encoding,·is·replaced·by·a·string·consisting·of·a·U+0026
634 AMPERSAND·character·(&amp;),·a·&quot;#&quot;·(U+0023)·character,·one·or·more·ASCII·digits634 AMPERSAND·character·(&amp;),·a·&quot;#&quot;·(U+0023)·character,·one·or·more·ASCII·digits
635 representing·the·Unicode·code·point·of·the·character·in·base·ten,·and·finally·a635 representing·the·Unicode·code·point·of·the·character·in·base·ten,·and·finally·a
636 &quot;;&quot;·(U+003B)·character.</p><p>Bytes·that·are·out·of·the·range·0x2A,·0x2D,·0x2E,·0x30·to·0x39,·0x41·to·0x5A,636 &quot;;&quot;·(U+003B)·character.</p><p>Bytes·that·are·out·of·the·range·0x2A,·0x2D,·0x2E,·0x30·to·0x39,·0x41·to·0x5A,
637 0x5F,·0x61·to·0x7A,·are·percent-encoded·(U+0025·PERCENT·SIGN·character·(%)637 0x5F,·0x61·to·0x7A,·are·percent-encoded·(U+0025·PERCENT·SIGN·character·(%)
638 followed·by·uppercase·ASCII·hex·digits·representing·the·hexadecimal·value·of·the638 followed·by·uppercase·ASCII·hex·digits·representing·the·hexadecimal·value·of·the
639 byte).</p><p>See·also·the·opposite·operation·<a·href="#dissect_query/1"><code·class="inline">dissect_query/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="3712702403-1">(</span><span·class="p"·data-group-id="3712702403-2">[</span><span·class="p"·data-group-id="3712702403-3">{</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="3712702403-3">}</span><span·class="p">,</span><span·class="p"·data-group-id="3712702403-4">{</span><span·class="s">&quot;city&quot;</span><span·class="p">,</span><span·class="s">&quot;örebro&quot;</span><span·class="p"·data-group-id="3712702403-4">}</span><span·class="p"·data-group-id="3712702403-2">]</span><span·class="p">,</span><span·class="gp·unselectable"> 
640 1&gt;·</span><span·class="p"·data-group-id="3712702403-5">[</span><span·class="p"·data-group-id="3712702403-6">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·170,·SHA:·000bb1da552ecd95a29a29cdba1f3ab3ac0a0e3d955f93b2d277065cef0ea3fa·...·]">639 byte).</p><p>See·also·the·opposite·operation·<a·href="#dissect_query/1"><code·class="inline">dissect_query/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">[·...·truncated·by·diffoscope;·len:·731,·SHA:·77282cbeda8e80ef8fd1421b8c9c6e7fb53cead5de9fa000a5b4cdf98f92757b·...·]">
 640 1&gt;·</span><span·class="p"·data-group-id="2955487961-5">[</span><span·class="p"·data-group-id="2955487961-6">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="p"·data-group-id="2955487961-6">}</span><span·class="p"·data-group-id="2955487961-5">]</span><span·class="p"·data-group-id="2955487961-1">)</span><span·class="p">.</span><span·class="w">
641 </span><span·class="s">&quot;foo+bar=1&amp;city=%F6rebro&quot;</span><span·class="gp·unselectable">641 </span><span·class="s">&quot;foo+bar=1&amp;city=%F6rebro&quot;</span><span·class="gp·unselectable">
642 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="3712702403-7">(</span><span·class="p"·data-group-id="3712702403-8">[</span><span·class="p"·data-group-id="3712702403-9">{</span><span·class="p"·data-group-id="3712702403-10">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="3712702403-10">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="3712702403-11">&lt;&lt;</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="3712702403-11">&gt;&gt;</span><span·class="p"·data-group-id="3712702403-9">}</span><span·class="p">,</span><span·class="gp·unselectable"> 
643 2&gt;·</span><span·class="p"·data-group-id="3712702403-12">{</span><span·class="p"·data-group-id="3712702403-13">&lt;&lt;</span><span·class="s">&quot;city&quot;</span><span·class="p"·data-group-id="3712702403-13">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·753,·SHA:·54a95ef5ae7314615e07de43dc506ef6afca49677014560292d572161c4580b5·...·]">642 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">compose_query</span><span·class="p"·data-group-id="2955487961-7">(</span><span·class="p"·data-group-id="2955487961-8">[</span><span·class="p"·data-group-id="2955487961-9">{</span><span·class="p"[·...·truncated·by·diffoscope;·len:·436,·SHA:·bafec64be8113415972c6d016ad2d4fe227e6c72d0092217b6a4b39d15aa632c·...·]">
 643 2&gt;·</span><span·class="p"·data-group-id="2955487961-12">{</span><span·class="p"·data-group-id="2955487961-13">&lt;&lt;</span><span·class="s">&quot;city&quot;</span><span·class="p"·data-group-id="2955487961-13">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="2955487961-14">&lt;&lt;</span><span·class="s">&quot;東京&quot;</span><span·class="o">/</span><span·class="ss">utf8</span><span·class="p"·data-group-id="2955487961-14">&gt;&gt;</span><span·class="p"·data-group-id="2955487961-12">}</span><span·class="p"·data-group-id="2955487961-8">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2955487961-15">[</span><span·class="p"·data-group-id="2955487961-16">{</span><span·class="ss">encoding</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">latin1</span><span·class="p"·data-group-id="2955487961-16">}</span><span·class="p"·data-group-id="2955487961-15">]</span><span·class="p"·data-group-id="2955487961-7">)</span><span·class="p">.</span><span·class="w">
644 </span><span·class="p"·data-group-id="3712702403-17">&lt;&lt;</span><span·class="s">&quot;foo+bar=1&amp;city=%26%2326481%3B%26%2320140%3B&quot;</span><span·class="p"·data-group-id="3712702403-17">&gt;&gt;</span></code></pre>644 </span><span·class="p"·data-group-id="2955487961-17">&lt;&lt;</span><span·class="s">&quot;foo+bar=1&amp;city=%26%2326481%3B%26%2320140%3B&quot;</span><span·class="p"·data-group-id="2955487961-17">&gt;&gt;</span></code></pre>
645 ··</section>645 ··</section>
646 </section>646 </section>
647 <section·class="detail"·id="dissect_query/1">647 <section·class="detail"·id="dissect_query/1">
  
648 ··<div·class="detail-header">648 ··<div·class="detail-header">
649 ····<a·href="#dissect_query/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">649 ····<a·href="#dissect_query/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
650 ······<i·class="ri-link-m"·aria-hidden="true"></i>650 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 671, 19 lines modifiedOffset 671, 19 lines modified
671 ···························QueryList·::·[{<a·href="unicode.html#t:chardata/0">unicode:chardata</a>(),·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>()·|·true}]·|·<a·href="#t:error/0">error</a>().</pre>671 ···························QueryList·::·[{<a·href="unicode.html#t:chardata/0">unicode:chardata</a>(),·<a·href="unicode.html#t:chardata/0">unicode:chardata</a>()·|·true}]·|·<a·href="#t:error/0">error</a>().</pre>
  
672 ······</div>672 ······</div>
  
673 <p>Dissects·an·urlencoded·<code·class="inline">QueryString</code>·and·returns·a·<code·class="inline">QueryList</code>,·a·list·of673 <p>Dissects·an·urlencoded·<code·class="inline">QueryString</code>·and·returns·a·<code·class="inline">QueryList</code>,·a·list·of
674 non-percent-encoded·key-value·pairs.</p><p>Form-urlencoding·is·defined·in·section·4.10.21.6·of·the·<a·href="https://www.w3.org/TR/html52/">HTML·5.2</a>674 non-percent-encoded·key-value·pairs.</p><p>Form-urlencoding·is·defined·in·section·4.10.21.6·of·the·<a·href="https://www.w3.org/TR/html52/">HTML·5.2</a>
675 specification·and·in·section·4.10.22.6·of·the·<a·href="https://www.w3.org/TR/html50/">HTML·5.0</a>675 specification·and·in·section·4.10.22.6·of·the·<a·href="https://www.w3.org/TR/html50/">HTML·5.0</a>
676 specification·for·non-UTF-8·encodings.</p><p>See·also·the·opposite·operation·<a·href="#compose_query/1"><code·class="inline">compose_query/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">dissect_query</span><span·class="p"·data-group-id="9083265831-1">(</span><span·class="s">&quot;foo+bar=1&amp;city=%C3%B6rebro&quot;</span><span·class="p"·data-group-id="9083265831-1">)</span><span·class="p">.</span><span·class="w">676 specification·for·non-UTF-8·encodings.</p><p>See·also·the·opposite·operation·<a·href="#compose_query/1"><code·class="inline">compose_query/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">dissect_query</span><span·class="p"·data-group-id="9267632667-1">(</span><span·class="s">&quot;foo+bar=1&amp;city=%C3%B6rebro&quot;</span><span·class="p"·data-group-id="9267632667-1">)</span><span·class="p">.</span><span·class="w">
677 </span><span·class="p"·data-group-id="9083265831-2">[</span><span·class="p"·data-group-id="9083265831-3">{</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="9083265831-3">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·248,·SHA:·f124d99fc3e915badf852f190759f7428966a2a1a19a8e8d53ed5746d113a424·...·]-2">]</span><span·class="gp·unselectable">677 </span><span·class="p"·data-group-id="9267632667-2">[</span><span·class="p"·data-group-id="9267632667-3">{</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="s">&quot;1&quot;</span><span·class="p"·data-group-id="9267632667-3">}</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·248,·SHA:·8b30548262a51e90566608bd248685d78e7edded593db7e2b03485a9902948a0·...·]-2">]</span><span·class="gp·unselectable">
678 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">dissect_query</span><span·class="p"·data-group-id="9083265831-5">(</span><span·class="p"·data-group-id="9083265831-6">&lt;&lt;</span><span·class="s">&quot;foo+bar=1&amp;city=%26%2326481%3B%26%2320140%3B&quot;</span><span·class="p"·data-group-id="9083265831-6">&gt;&gt;</span><span·class="p"·data-group-id="90[·...·truncated·by·diffoscope;·len:·8,·SHA:·587f9824db0167e4cd1c0f951ff758854242e40462cc7819d2763c2898c8b56c·...·]-5">)</span><span·class="p">.</span><span·class="w">678 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">dissect_query</span><span·class="p"·data-group-id="9267632667-5">(</span><span·class="p"·data-group-id="9267632667-6">&lt;&lt;</span><span·class="s">&quot;foo+bar=1&amp;city=%26%2326481%3B%26%2320140%3B&quot;</span><span·class="p"·data-group-id="9267632667-6">&gt;&gt;</span><span·class="p"·data-group-id="92[·...·truncated·by·diffoscope;·len:·8,·SHA:·cb303e1fb79c87018b1089810f03520013bb7bb581973355dd7e1e74ed8721cd·...·]-5">)</span><span·class="p">.</span><span·class="w">
679 </span><span·class="p"·data-group-id="9083265831-7">[</span><span·class="p"·data-group-id="9083265831-8">{</span><span·class="p"·data-group-id="9083265831-9">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="9083265831-9">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·203,·SHA:·75ac7b35516aca626d09c2405388b8b03fa4cecec4e950b5681412f23c530029·...·]-8">}</span><span·class="p">,</span><span·class="w">679 </span><span·class="p"·data-group-id="9267632667-7">[</span><span·class="p"·data-group-id="9267632667-8">{</span><span·class="p"·data-group-id="9267632667-9">&lt;&lt;</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="9267632667-9">&gt;&gt;</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·203,·SHA:·7b0ed29a872e70150b78ccf61664717fa020a0e5c5e5fb099cb31b211994921e·...·]-8">}</span><span·class="p">,</span><span·class="w">
680 ·</span><span·class="p"·data-group-id="9083265831-11">{</span><span·class="p"·data-group-id="9083265831-12">&lt;&lt;</span><span·class="s">&quot;city&quot;</span><span·class="p"·data-group-id="9083265831-12">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="9083265831-13">&lt[·...·truncated·by·diffoscope;·len:·450,·SHA:·36db7a6618a0432777140b8b6c3ccb16954f0869a2cc1fa1988cb2f3bdcd6deb·...·]-7">]</span></code></pre>680 ·</span><span·class="p"·data-group-id="9267632667-11">{</span><span·class="p"·data-group-id="9267632667-12">&lt;&lt;</span><span·class="s">&quot;city&quot;</span><span·class="p"·data-group-id="9267632667-12">&gt;&gt;</span><span·class="p">,</span><span·class="p"·data-group-id="9267632667-13">&lt[·...·truncated·by·diffoscope;·len:·450,·SHA:·f830d59bbfb00e3e5cf502970f70979c43157624a525c8c0072f4e0cfd47f2c3·...·]-7">]</span></code></pre>
681 ··</section>681 ··</section>
682 </section>682 </section>
683 <section·class="detail"·id="normalize/1">683 <section·class="detail"·id="normalize/1">
  
684 ··<div·class="detail-header">684 ··<div·class="detail-header">
685 ····<a·href="#normalize/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">685 ····<a·href="#normalize/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
686 ······<i·class="ri-link-m"·aria-hidden="true"></i>686 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 707, 22 lines modifiedOffset 707, 22 lines modified
707 ···················when·URI·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:uri_map/0">uri_map</a>(),·NormalizedURI·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:error/0">error</a>().</pre>707 ···················when·URI·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:uri_map/0">uri_map</a>(),·NormalizedURI·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:error/0">error</a>().</pre>
  
708 ······</div>708 ······</div>
  
709 <p>Transforms·an·<code·class="inline">URI</code>·into·a·normalized·form·using·Syntax-Based·Normalization·as709 <p>Transforms·an·<code·class="inline">URI</code>·into·a·normalized·form·using·Syntax-Based·Normalization·as
710 defined·by·<a·href="https://www.ietf.org/rfc/rfc3986.txt">RFC·3986</a>.</p><p>This·function·implements·case·normalization,·percent-encoding·normalization,710 defined·by·<a·href="https://www.ietf.org/rfc/rfc3986.txt">RFC·3986</a>.</p><p>This·function·implements·case·normalization,·percent-encoding·normalization,
711 path·segment·normalization·and·scheme·based·normalization·for·HTTP(S)·with·basic711 path·segment·normalization·and·scheme·based·normalization·for·HTTP(S)·with·basic
712 support·for·FTP,·SSH,·SFTP·and·TFTP.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="9886844819-1">(</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p"·data-group-id="9886844819-1">)</span><span·class="p">.</span><span·class="w">712 support·for·FTP,·SSH,·SFTP·and·TFTP.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="4913669403-1">(</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p"·data-group-id="4913669403-1">)</span><span·class="p">.</span><span·class="w">
713 </span><span·class="s">&quot;/a/g&quot;</span><span·class="gp·unselectable">713 </span><span·class="s">&quot;/a/g&quot;</span><span·class="gp·unselectable">
714 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="9886844819-2">(</span><span·class="p"·data-group-id="9886844819-3">&lt;&lt;</span><span·class="s">&quot;mid/content=5/../6&quot;</span><span·class="p"·data-group-id="9886844819-3">&gt;&gt;</span><span·class="p"·data-group-id="9886844819-2">)</span><span·class="p">.</span><span·class="w">714 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="4913669403-2">(</span><span·class="p"·data-group-id="4913669403-3">&lt;&lt;</span><span·class="s">&quot;mid/content=5/../6&quot;</span><span·class="p"·data-group-id="4913669403-3">&gt;&gt;</span><span·class="p"·data-group-id="4913669403-2">)</span><span·class="p">.</span><span·class="w">
715 </span><span·class="p"·data-group-id="9886844819-4">&lt;&lt;</span><span·class="s">&quot;mid/6&quot;</span><span·class="p"·data-group-id="9886844819-4">&gt;&gt;</span><span·class="gp·unselectable">715 </span><span·class="p"·data-group-id="4913669403-4">&lt;&lt;</span><span·class="s">&quot;mid/6&quot;</span><span·class="p"·data-group-id="4913669403-4">&gt;&gt;</span><span·class="gp·unselectable">
716 3&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="9886844819-5">(</span><span·class="s">&quot;http://localhost:80&quot;</span><span·class="p"·data-group-id="9886844819-5">)</span><span·class="p">.</span><span·class="w">716 3&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="4913669403-5">(</span><span·class="s">&quot;http://localhost:80&quot;</span><span·class="p"·data-group-id="4913669403-5">)</span><span·class="p">.</span><span·class="w">
717 </span><span·class="s">&quot;http://localhost/&quot;</span><span·class="gp·unselectable">717 </span><span·class="s">&quot;http://localhost/&quot;</span><span·class="gp·unselectable">
718 4&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="9886844819-6">(</span><span·class="p"·data-group-id="9886844819-7">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p">,</span><span·class="gp·unselectable">718 4&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="4913669403-6">(</span><span·class="p"·data-group-id="4913669403-7">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p">,</span><span·class="gp·unselectable">
719 4&gt;·</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;localhost-örebro&quot;</span><span·class="p"·data-group-id="9886844819-7">}</span><span·class="p"·data-group-id="9886844819-6">)</span><span·class="p">.</span><span·class="w">719 4&gt;·</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;localhost-örebro&quot;</span><span·class="p"·data-group-id="4913669403-7">}</span><span·class="p"·data-group-id="4913669403-6">)</span><span·class="p">.</span><span·class="w">
720 </span><span·class="s">&quot;http://localhost-%C3%B6rebro/a/g&quot;</span></code></pre>720 </span><span·class="s">&quot;http://localhost-%C3%B6rebro/a/g&quot;</span></code></pre>
721 ··</section>721 ··</section>
722 </section>722 </section>
723 <section·class="detail"·id="normalize/2">723 <section·class="detail"·id="normalize/2">
  
724 ··<div·class="detail-header">724 ··<div·class="detail-header">
725 ····<a·href="#normalize/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">725 ····<a·href="#normalize/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
Offset 749, 23 lines modifiedOffset 749, 23 lines modified
749 ·······················Options·::·[return_map],749 ·······················Options·::·[return_map],
750 ·······················NormalizedURI·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:uri_map/0">uri_map</a>()·|·<a·href="#t:error/0">error</a>().</pre>750 ·······················NormalizedURI·::·<a·href="#t:uri_string/0">uri_string</a>()·|·<a·href="#t:uri_map/0">uri_map</a>()·|·<a·href="#t:error/0">error</a>().</pre>
  
751 ······</div>751 ······</div>
  
752 <p>Same·as·<a·href="#normalize/1"><code·class="inline">normalize/1</code></a>·but·with·an·additional·<code·class="inline">Options</code>752 <p>Same·as·<a·href="#normalize/1"><code·class="inline">normalize/1</code></a>·but·with·an·additional·<code·class="inline">Options</code>
753 parameter,·that·controls·whether·the·normalized·URI·shall·be·returned·as·an753 parameter,·that·controls·whether·the·normalized·URI·shall·be·returned·as·an
754 uri_map().</p><p>There·is·one·supported·option:·<code·class="inline">return_map</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8952762106-1">(</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8952762106-2">[</span><span·class="ss">return_map</span><span·class="p"·data-group-id="8952762106-2">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·82da3754bc5d861475cfd414482c3a7952acf45350b2932cdc24f509ea75dafc·...·]-1">)</span><span·class="p">.</span><span·class="w">754 uri_map().</p><p>There·is·one·supported·option:·<code·class="inline">return_map</code>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8784339022-1">(</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8784339022-2">[</span><span·class="ss">return_map</span><span·class="p"·data-group-id="8784339022-2">]</s[·...·truncated·by·diffoscope;·len:·45,·SHA:·842fdbff3fbb73e36dee4d63b6e064614be8f8e5f1821470fed5dd6543063342·...·]-1">)</span><span·class="p">.</span><span·class="w">
755 </span><span·class="p"·data-group-id="8952762106-3">#{</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/a/g&quot;</span><span·class="p"·data-group-id="8952762106-3">}</span><span·class="gp·unselectable">755 </span><span·class="p"·data-group-id="8784339022-3">#{</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/a/g&quot;</span><span·class="p"·data-group-id="8784339022-3">}</span><span·class="gp·unselectable">
756 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8952762106-4">(</span><span·class="p"·data-group-id="8952762106-5">&lt;&lt;</span><span·class="s">&quot;mid/content=5/../6&quot;</span><span·class="p"·data-group-id="8952762106-5">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·167,·SHA:·25662fa7df9f9a463810870c7d1a8bf12589d604b9132b4348e46d0ce4429dde·...·]-4">)</span><span·class="p">.</span><span·class="w">756 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8784339022-4">(</span><span·class="p"·data-group-id="8784339022-5">&lt;&lt;</span><span·class="s">&quot;mid/content=5/../6&quot;</span><span·class="p"·data-group-id="8784339022-5">&gt;&gt;</span><span·class="p">,</span><span·class="w">·</span><span·class="p[·...·truncated·by·diffoscope;·len:·167,·SHA:·f5150861f03965753d60608813e0ab2f1d6af9d84e737dc8df8ebddb79a1fffa·...·]-4">)</span><span·class="p">.</span><span·class="w">
757 </span><span·class="p"·data-group-id="8952762106-7">#{</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8952762106-8">&lt;&lt;</span><span·class="s">&quot;mid/6&quot;</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·71,·SHA:·42e873bfeec39a80052c8dba16cdaf20179d51666c70b3fd4ab951a5753085f1·...·]-7">}</span><span·class="gp·unselectable">757 </span><span·class="p"·data-group-id="8784339022-7">#{</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8784339022-8">&lt;&lt;</span><span·class="s">&quot;mid/6&quot;</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·71,·SHA:·204e6f8c67ef601cfb153508a61b553d11d5f3d0dd0071b4fcd333241304f382·...·]-7">}</span><span·class="gp·unselectable">
758 3&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8952762106-9">(</span><span·class="s">&quot;http://localhost:80&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8952762106-10">[</span><span·class="ss">return_map</span><span·class="p"·data-group-id="8952762106-10"[·...·truncated·by·diffoscope;·len:·50,·SHA:·b9a8687144efc759949a152782c74590ed23af6e3a1f00813503ec4feb7d8bdf·...·]-9">)</span><span·class="p">.</span><span·class="w">758 3&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8784339022-9">(</span><span·class="s">&quot;http://localhost:80&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8784339022-10">[</span><span·class="ss">return_map</span><span·class="p"·data-group-id="8784339022-10"[·...·truncated·by·diffoscope;·len:·50,·SHA:·14fc954e23d6908f0af643dc75b499a06e95315b76f88ea803ab98931eaa4f1c·...·]-9">)</span><span·class="p">.</span><span·class="w">
759 </span><span·class="p"·data-group-id="8952762106-11">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·289,·SHA:·9b3e47f6a1e41473e10952ffda22f5aae69afa18a243a973b57183e7774f94b2·...·]-11">}</span><span·class="gp·unselectable">759 </span><span·class="p"·data-group-id="8784339022-11">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·289,·SHA:·2c73cfbe84aa3222957d3870b7b1571571e54457cb137d296e4a4118d4c9baef·...·]-11">}</span><span·class="gp·unselectable">
760 4&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8952762106-12">(</span><span·class="p"·data-group-id="8952762106-13">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p">,</span><span·class="gp·unselectable">760 4&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8784339022-12">(</span><span·class="p"·data-group-id="8784339022-13">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">80</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/a/b/c/./../../g&quot;</span><span·class="p">,</span><span·class="gp·unselectable">
761 4&gt;·</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;localhost-örebro&quot;</span><span·class="p"·data-group-id="8952762106-13">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8952762106-14">[</span><span·class="ss">return_map</span><span·class="p"·data-group-id="8952762106-14">]</span><span·class="p"·data-group-id="8952762106-12">)</span><span·class="p">.</span><span·class="w">761 4&gt;·</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;localhost-örebro&quot;</span><span·class="p"·data-group-id="8784339022-13">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8784339022-14">[</span><span·class="ss">return_map</span><span·class="p"·data-group-id="8784339022-14">]</span><span·class="p"·data-group-id="8784339022-12">)</span><span·class="p">.</span><span·class="w">
762 </span><span·class="p"·data-group-id="8952762106-15">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·299,·SHA:·b07770929cbfbcd4c41516057d9b497beb683619ff2daea47fbce1a0cadaf2f8·...·]-15">}</span></code></pre>762 </span><span·class="p"·data-group-id="8784339022-15">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class=[·...·truncated·by·diffoscope;·len:·299,·SHA:·6b3152361da0f3bc9785fc9ad1bb3fc735969762d6af18fcdcddaffacd49b672·...·]-15">}</span></code></pre>
763 ··</section>763 ··</section>
764 </section>764 </section>
765 <section·class="detail"·id="parse/1">765 <section·class="detail"·id="parse/1">
  
766 ··<div·class="detail-header">766 ··<div·class="detail-header">
767 ····<a·href="#parse/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">767 ····<a·href="#parse/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
768 ······<i·class="ri-link-m"·aria-hidden="true"></i>768 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 787, 22 lines modifiedOffset 787, 22 lines modified
  
787 ··········<pre·translate="no"><span·class="attribute">-spec</span>·parse(URIString)·->·URIMap·when·URIString·::·<a·href="#t:uri_string/0">uri_string</a>(),·URIMap·::·<a·href="#t:uri_map/0">uri_map</a>()·|·<a·href="#t:error/0">error</a>().</pre>787 ··········<pre·translate="no"><span·class="attribute">-spec</span>·parse(URIString)·->·URIMap·when·URIString·::·<a·href="#t:uri_string/0">uri_string</a>(),·URIMap·::·<a·href="#t:uri_map/0">uri_map</a>()·|·<a·href="#t:error/0">error</a>().</pre>
  
788 ······</div>788 ······</div>
  
789 <p>Parses·an·<a·href="https://www.ietf.org/rfc/rfc3986.txt">RFC·3986</a>·compliant789 <p>Parses·an·<a·href="https://www.ietf.org/rfc/rfc3986.txt">RFC·3986</a>·compliant
790 <a·href="#t:uri_string/0"><code·class="inline">uri_string/0</code></a>·into·a·<a·href="#t:uri_map/0"><code·class="inline">uri_map/0</code></a>,·that·holds·the·parsed·components·of·the790 <a·href="#t:uri_string/0"><code·class="inline">uri_string/0</code></a>·into·a·<a·href="#t:uri_map/0"><code·class="inline">uri_map/0</code></a>,·that·holds·the·parsed·components·of·the
791 <code·class="inline">URI</code>.·If·parsing·fails,·an·error·tuple·is·returned.</p><p>See·also·the·opposite·operation·<a·href="#recompose/1"><code·class="inline">recompose/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="8447303511-1">(</span><span·class="s">&quot;foo://user@example.com:8042/over/there?name=ferret#nose&quot;</span><span·class="p"·data-group-id="8447303511-1">)</span><span·class="p">.</span><span·class="w">791 <code·class="inline">URI</code>.·If·parsing·fails,·an·error·tuple·is·returned.</p><p>See·also·the·opposite·operation·<a·href="#recompose/1"><code·class="inline">recompose/1</code></a>.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="3384325839-1">(</span><span·class="s">&quot;foo://user@example.com:8042/over/there?name=ferret#nose&quot;</span><span·class="p"·data-group-id="3384325839-1">)</span><span·class="p">.</span><span·class="w">
792 </span><span·class="p"·data-group-id="8447303511-2">#{</span><span·class="ss">fragment</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;nose&quot;</span><span·class="p">,</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;example.com&quot;</span><span·class="p">,</span><span·class="w">792 </span><span·class="p"·data-group-id="3384325839-2">#{</span><span·class="ss">fragment</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;nose&quot;</span><span·class="p">,</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;example.com&quot;</span><span·class="p">,</span><span·class="w">
793 ··</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/over/there&quot;</span><span·class="p">,</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">8042</span><span·class="p">,</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;name=ferret&quot;</span><span·class="p">,</span><span·class="w">793 ··</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/over/there&quot;</span><span·class="p">,</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">8042</span><span·class="p">,</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;name=ferret&quot;</span><span·class="p">,</span><span·class="w">
794 ··</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">userinfo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;user&quot;</span><span·class="p"·data-group-id="8447303511-2">}</span><span·class="gp·unselectable">794 ··</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">userinfo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;user&quot;</span><span·class="p"·data-group-id="3384325839-2">}</span><span·class="gp·unselectable">
795 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="8447303511-3">(</span><span·class="p"·data-group-id="8447303511-4">&lt;&lt;</span><span·class="s">&quot;foo://user@example.com:8042/over/there?name=ferret&quot;</span><span·class="p"·data-group-id="8447303511-4">&gt;&gt;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·ab3eeace3554211b76a5ce8bde5e831bf7c222da0f291a3372e3e55281435a33·...·]-3">)</span><span·class="p">.</span><span·class="w">795 2&gt;·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="3384325839-3">(</span><span·class="p"·data-group-id="3384325839-4">&lt;&lt;</span><span·class="s">&quot;foo://user@example.com:8042/over/there?name=ferret&quot;</span><span·class="p"·data-group-id="3384325839-4">&gt;&gt;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·12,·SHA:·0b81f9e40ace7d472cd187203962ffea0b9a49e32a5fbcf40c24ba3b17fd7096·...·]-3">)</span><span·class="p">.</span><span·class="w">
796 </span><span·class="p"·data-group-id="8447303511-5">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8447303511-6">&lt;&lt;</span><span·class="s">&quot;example.com&quot;</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·312,·SHA:·e1707d54e59eb773977f70e929ed2d2cdc075b186b5dae944282cb6e9adaeadf·...·]-7">&gt;&gt;</span><span·class="p">,</span><span·class="w">796 </span><span·class="p"·data-group-id="3384325839-5">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3384325839-6">&lt;&lt;</span><span·class="s">&quot;example.com&quot;</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·312,·SHA:·a17915f35ceb51d3b5d8051e8ce1fc525e6c588a728ef1e4f4e7a68637057441·...·]-7">&gt;&gt;</span><span·class="p">,</span><span·class="w">
797 ··</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">8042</span><span·class="p">,</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8447303511-8">&lt;&lt;</span><span·class="s">&quot;name=ferret&quot;</span><span·class="p"·data-group-id="8447303511-8">&gt;&gt;</span><span·class="p">,</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w"[·...·truncated·by·diffoscope;·len:·148,·SHA:·dc4f20846d9dbc4bd701d9a65b4998d5e1659ef8b859595c4803b5fbdc66d26b·...·]-9">&gt;&gt;</span><span·class="p">,</span><span·class="w">797 ··</span><span·class="ss">port</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="mi">8042</span><span·class="p">,</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3384325839-8">&lt;&lt;</span><span·class="s">&quot;name=ferret&quot;</span><span·class="p"·data-group-id="3384325839-8">&gt;&gt;</span><span·class="p">,</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w"[·...·truncated·by·diffoscope;·len:·148,·SHA:·e342e1c67a61b26c1299f18d54dfe23aa6d3afbae508851e7368842266e4da0e·...·]-9">&gt;&gt;</span><span·class="p">,</span><span·class="w">
798 ··</span><span·class="ss">userinfo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="8447303511-10">&lt;&lt;</span><span·class="s">&quot;user&quot;</span><span·class="p"·data-group-id="8447303511-10">&gt;&gt;</span><span·class="p"·data-group-id="8447303511-5">}</span></code></pre>798 ··</span><span·class="ss">userinfo</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="3384325839-10">&lt;&lt;</span><span·class="s">&quot;user&quot;</span><span·class="p"·data-group-id="3384325839-10">&gt;&gt;</span><span·class="p"·data-group-id="3384325839-5">}</span></code></pre>
799 ··</section>799 ··</section>
800 </section>800 </section>
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190 URI·components·using·<a·href="unicode_usage.html#what-unicode-is">Unicode</a>·characters.190 URI·components·using·<a·href="unicode_usage.html#what-unicode-is">Unicode</a>·characters.
191 <a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>·is·a·convenient·choice·for·enabling191 <a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>·is·a·convenient·choice·for·enabling
192 operations·such·as·producing·standard·compliant·URIs·out·of·components·that·have192 operations·such·as·producing·standard·compliant·URIs·out·of·components·that·have
193 special·or·<a·href="unicode_usage.html#what-unicode-is">Unicode</a>·characters.·It·is·easier193 special·or·<a·href="unicode_usage.html#what-unicode-is">Unicode</a>·characters.·It·is·easier
194 to·explain·this·by·an·example.</p><p>Let's·say·that·we·would·like·to·create·the·following·URI·and·send·it·over·the194 to·explain·this·by·an·example.</p><p>Let's·say·that·we·would·like·to·create·the·following·URI·and·send·it·over·the
195 network:·<code·class="inline">http://cities/örebro?foo·bar</code>.·This·is·not·a·valid·URI·as·it·contains195 network:·<code·class="inline">http://cities/örebro?foo·bar</code>.·This·is·not·a·valid·URI·as·it·contains
196 characters·that·are·not·allowed·in·a·URI·such·as·&quot;ö&quot;·and·the·space.·We·can196 characters·that·are·not·allowed·in·a·URI·such·as·&quot;ö&quot;·and·the·space.·We·can
197 verify·this·by·parsing·the·URI:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="9287542210-1">(</span><span·class="s">&quot;http://cities/örebro?foo·bar&quot;</span><span·class="p"·data-group-id="9287542210-1">)</span><span·class="p">.</span><span·class="w">197 verify·this·by·parsing·the·URI:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="1146020859-1">(</span><span·class="s">&quot;http://cities/örebro?foo·bar&quot;</span><span·class="p"·data-group-id="1146020859-1">)</span><span·class="p">.</span><span·class="w">
198 ··</span><span·class="p"·data-group-id="9287542210-2">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">invalid_uri</span><span·class="p">,</span><span·class="s">&quot;:&quot;</span><span·class="p"·data-group-id="9287542210-2">}</span></code></pre><p>The·URI·parser·tries·all·possible·combinations·to·interpret·the·input·and·fails198 ··</span><span·class="p"·data-group-id="1146020859-2">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">invalid_uri</span><span·class="p">,</span><span·class="s">&quot;:&quot;</span><span·class="p"·data-group-id="1146020859-2">}</span></code></pre><p>The·URI·parser·tries·all·possible·combinations·to·interpret·the·input·and·fails
199 at·the·last·attempt·when·it·encounters·the·colon·character·<code·class="inline">&quot;:&quot;</code>.·Note,·that·the199 at·the·last·attempt·when·it·encounters·the·colon·character·<code·class="inline">&quot;:&quot;</code>.·Note,·that·the
200 inital·fault·occurs·when·the·parser·attempts·to·interpret·the·character·<code·class="inline">&quot;ö&quot;</code>200 inital·fault·occurs·when·the·parser·attempts·to·interpret·the·character·<code·class="inline">&quot;ö&quot;</code>
201 and·after·a·failure·back-tracks·to·the·point·where·it·has·another·possible201 and·after·a·failure·back-tracks·to·the·point·where·it·has·another·possible
202 parsing·alternative.</p><p>The·proper·way·to·solve·this·problem·is·to·use·<a·href="uri_string.html#recompose/1"><code·class="inline">uri_string:recompose/1</code></a>·with·a202 parsing·alternative.</p><p>The·proper·way·to·solve·this·problem·is·to·use·<a·href="uri_string.html#recompose/1"><code·class="inline">uri_string:recompose/1</code></a>·with·a
203 <a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>·as·input:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">recompose</span><span·class="p"·data-group-id="9894613207-1">(</span><span·class="p"·data-group-id="9894613207-2">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;cities&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/örebro&quot;</span><span·class="p">,</span><span·class="w">203 <a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>·as·input:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">recompose</span><span·class="p"·data-group-id="0078003635-1">(</span><span·class="p"·data-group-id="0078003635-2">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;cities&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/örebro&quot;</span><span·class="p">,</span><span·class="w">
204 ··</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="9894613207-2">}</span><span·class="p"·data-group-id="9894613207-1">)</span><span·class="p">.</span><span·class="w">204 ··</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p"·data-group-id="0078003635-2">}</span><span·class="p"·data-group-id="0078003635-1">)</span><span·class="p">.</span><span·class="w">
205 ··</span><span·class="s">&quot;http://cities/%C3%B6rebro?foo%20bar&quot;</span></code></pre><p>The·result·is·a·valid·URI·where·all·the·special·characters·are·encoded·as205 ··</span><span·class="s">&quot;http://cities/%C3%B6rebro?foo%20bar&quot;</span></code></pre><p>The·result·is·a·valid·URI·where·all·the·special·characters·are·encoded·as
206 defined·by·the·standard.·Applying·<a·href="uri_string.html#parse/1"><code·class="inline">uri_string:parse/1</code></a>·and206 defined·by·the·standard.·Applying·<a·href="uri_string.html#parse/1"><code·class="inline">uri_string:parse/1</code></a>·and
207 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>·on·the·URI·returns·the·original·input:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="2394248048-1">(</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="2394248048-2">(</span><span·class="s">&quot;http://cities/%C3%B6rebro?foo%20bar&quot;</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·d28e8b6a9c5a52330a336459aca5c9581f2c08ba028482aca7cf99cc3771ed80·...·]-1">)</span><span·class="p">.</span><span·class="w">207 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>·on·the·URI·returns·the·original·input:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="0747140940-1">(</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="0747140940-2">(</span><span·class="s">&quot;http://cities/%C3%B6rebro?foo%20bar&quot;</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·01fc5bf91fe47394cc69b4398f7b58e3911b270e27d453511fe6ef8075bb3bfd·...·]-1">)</span><span·class="p">.</span><span·class="w">
208 ··</span><span·class="p"·data-group-id="2394248048-3">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;cities&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/örebro&quot;</span><span·class="p">,</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="w">208 ··</span><span·class="p"·data-group-id="0747140940-3">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;cities&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/örebro&quot;</span><span·class="p">,</span><span·class="k">query</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;foo·bar&quot;</span><span·class="p">,</span><span·class="w">
209 ··</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p"·data-group-id="2394248048-3">}</span></code></pre><p>This·symmetric·property·is·heavily·used·in·our·property·test·suite.</p><h2·id="percent-encoding"·class="section-heading">209 ··</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p"·data-group-id="0747140940-3">}</span></code></pre><p>This·symmetric·property·is·heavily·used·in·our·property·test·suite.</p><h2·id="percent-encoding"·class="section-heading">
210 ··<a·href="#percent-encoding"·class="hover-link">210 ··<a·href="#percent-encoding"·class="hover-link">
211 ····<i·class="ri-link-m"·aria-hidden="true"></i>211 ····<i·class="ri-link-m"·aria-hidden="true"></i>
212 ··</a>212 ··</a>
213 ··<span·class="text">Percent-encoding</span>213 ··<span·class="text">Percent-encoding</span>
214 </h2>214 </h2>
215 <p>As·you·have·seen·in·the·previous·chapter,·a·standard·URI·can·only·contain·a215 <p>As·you·have·seen·in·the·previous·chapter,·a·standard·URI·can·only·contain·a
216 strict·subset·of·the·US·ASCII·character·set,·moreover·the·allowed·set·of216 strict·subset·of·the·US·ASCII·character·set,·moreover·the·allowed·set·of
Offset 225, 72 lines modifiedOffset 225, 72 lines modified
225 <a·href="unicode_usage.html#what-unicode-is">Unicode</a>·and·it·is·encoded·using·a·single225 <a·href="unicode_usage.html#what-unicode-is">Unicode</a>·and·it·is·encoded·using·a·single
226 octet·<code·class="inline">0x20</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p><a·href="unicode_usage.html#what-unicode-is">Unicode</a>·is·backward·compatible·with·ASCII,226 octet·<code·class="inline">0x20</code>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p><a·href="unicode_usage.html#what-unicode-is">Unicode</a>·is·backward·compatible·with·ASCII,
227 the·encoding·of·the·first·128·characters·is·the·same·binary·value·as·in·ASCII.</p></section><p><a·href=""·id="percent_encoding"></a>·It·is·a·major·source·of·confusion·exactly·which227 the·encoding·of·the·first·128·characters·is·the·same·binary·value·as·in·ASCII.</p></section><p><a·href=""·id="percent_encoding"></a>·It·is·a·major·source·of·confusion·exactly·which
228 characters·will·be·percent-encoded.·In·order·to·make·it·easier·to·answer·this228 characters·will·be·percent-encoded.·In·order·to·make·it·easier·to·answer·this
229 question·the·library·provides·a·utility·function,229 question·the·library·provides·a·utility·function,
230 <a·href="uri_string.html#allowed_characters/0"><code·class="inline">uri_string:allowed_characters/0</code></a>,·that230 <a·href="uri_string.html#allowed_characters/0"><code·class="inline">uri_string:allowed_characters/0</code></a>,·that
231 lists·the·allowed·set·of·characters·in·each·major·URI·component,·and·also·in·the231 lists·the·allowed·set·of·characters·in·each·major·URI·component,·and·also·in·the
232 most·important·standard·character·sets.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">allowed_characters</span><span·class="p"·data-group-id="4439965448-1">(</span><span·class="p"·data-group-id="4439965448-1">)</span><span·class="p">.</span><span·class="w">232 most·important·standard·character·sets.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">allowed_characters</span><span·class="p"·data-group-id="2867016159-1">(</span><span·class="p"·data-group-id="2867016159-1">)</span><span·class="p">.</span><span·class="w">
233 ····</span><span·class="p"·data-group-id="4439965448-2">[</span><span·class="p"·data-group-id="4439965448-3">{</span><span·class="ss">scheme</span><span·class="p">,</span><span·class="w">233 ····</span><span·class="p"·data-group-id="2867016159-2">[</span><span·class="p"·data-group-id="2867016159-3">{</span><span·class="ss">scheme</span><span·class="p">,</span><span·class="w">
234 ·····</span><span·class="s">&quot;+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz&quot;</span><span·class="p"·data-group-id="4439965448-3">}</span><span·class="p">,</span><span·class="w">234 ·····</span><span·class="s">&quot;+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz&quot;</span><span·class="p"·data-group-id="2867016159-3">}</span><span·class="p">,</span><span·class="w">
235 ····</span><span·class="p"·data-group-id="4439965448-4">{</span><span·class="ss">userinfo</span><span·class="p">,</span><span·class="w">235 ····</span><span·class="p"·data-group-id="2867016159-4">{</span><span·class="ss">userinfo</span><span·class="p">,</span><span·class="w">
236 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-.0123456789:;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-4">}</span><span·class="p">,</span><span·class="w">236 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-.0123456789:;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-4">}</span><span·class="p">,</span><span·class="w">
237 ····</span><span·class="p"·data-group-id="4439965448-5">{</span><span·class="ss">host</span><span·class="p">,</span><span·class="w">237 ····</span><span·class="p"·data-group-id="2867016159-5">{</span><span·class="ss">host</span><span·class="p">,</span><span·class="w">
238 ·····</span><span·class="s">&quot;!$&amp;&#39;()*+,-.0123456789:;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-5">}</span><span·class="p">,</span><span·class="w">238 ·····</span><span·class="s">&quot;!$&amp;&#39;()*+,-.0123456789:;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-5">}</span><span·class="p">,</span><span·class="w">
239 ····</span><span·class="p"·data-group-id="4439965448-6">{</span><span·class="ss">ipv4</span><span·class="p">,</span><span·class="s">&quot;.0123456789&quot;</span><span·class="p"·data-group-id="4439965448-6">}</span><span·class="p">,</span><span·class="w">239 ····</span><span·class="p"·data-group-id="2867016159-6">{</span><span·class="ss">ipv4</span><span·class="p">,</span><span·class="s">&quot;.0123456789&quot;</span><span·class="p"·data-group-id="2867016159-6">}</span><span·class="p">,</span><span·class="w">
240 ····</span><span·class="p"·data-group-id="4439965448-7">{</span><span·class="ss">ipv6</span><span·class="p">,</span><span·class="s">&quot;.0123456789:ABCDEFabcdef&quot;</span><span·class="p"·data-group-id="4439965448-7">}</span><span·class="p">,</span><span·class="w">240 ····</span><span·class="p"·data-group-id="2867016159-7">{</span><span·class="ss">ipv6</span><span·class="p">,</span><span·class="s">&quot;.0123456789:ABCDEFabcdef&quot;</span><span·class="p"·data-group-id="2867016159-7">}</span><span·class="p">,</span><span·class="w">
241 ····</span><span·class="p"·data-group-id="4439965448-8">{</span><span·class="ss">regname</span><span·class="p">,</span><span·class="w">241 ····</span><span·class="p"·data-group-id="2867016159-8">{</span><span·class="ss">regname</span><span·class="p">,</span><span·class="w">
242 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-.0123456789;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-8">}</span><span·class="p">,</span><span·class="w">242 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-.0123456789;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-8">}</span><span·class="p">,</span><span·class="w">
243 ····</span><span·class="p"·data-group-id="4439965448-9">{</span><span·class="ss">path</span><span·class="p">,</span><span·class="w">243 ····</span><span·class="p"·data-group-id="2867016159-9">{</span><span·class="ss">path</span><span·class="p">,</span><span·class="w">
244 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-./0123456789:;=@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-9">}</span><span·class="p">,</span><span·class="w">244 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-./0123456789:;=@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-9">}</span><span·class="p">,</span><span·class="w">
245 ····</span><span·class="p"·data-group-id="4439965448-10">{</span><span·class="k">query</span><span·class="p">,</span><span·class="w">245 ····</span><span·class="p"·data-group-id="2867016159-10">{</span><span·class="k">query</span><span·class="p">,</span><span·class="w">
246 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-./0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-10">}</span><span·class="p">,</span><span·class="w">246 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-./0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-10">}</span><span·class="p">,</span><span·class="w">
247 ····</span><span·class="p"·data-group-id="4439965448-11">{</span><span·class="ss">fragment</span><span·class="p">,</span><span·class="w">247 ····</span><span·class="p"·data-group-id="2867016159-11">{</span><span·class="ss">fragment</span><span·class="p">,</span><span·class="w">
248 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-./0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-11">}</span><span·class="p">,</span><span·class="w">248 ·····</span><span·class="s">&quot;!$%&amp;&#39;()*+,-./0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-11">}</span><span·class="p">,</span><span·class="w">
249 ····</span><span·class="p"·data-group-id="4439965448-12">{</span><span·class="ss">reserved</span><span·class="p">,</span><span·class="s">&quot;!#$&amp;&#39;()*+,/:;=?@[]&quot;</span><span·class="p"·data-group-id="4439965448-12">}</span><span·class="p">,</span><span·class="w">249 ····</span><span·class="p"·data-group-id="2867016159-12">{</span><span·class="ss">reserved</span><span·class="p">,</span><span·class="s">&quot;!#$&amp;&#39;()*+,/:;=?@[]&quot;</span><span·class="p"·data-group-id="2867016159-12">}</span><span·class="p">,</span><span·class="w">
250 ····</span><span·class="p"·data-group-id="4439965448-13">{</span><span·class="ss">unreserved</span><span·class="p">,</span><span·class="w">250 ····</span><span·class="p"·data-group-id="2867016159-13">{</span><span·class="ss">unreserved</span><span·class="p">,</span><span·class="w">
251 ·····</span><span·class="s">&quot;-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="4439965448-13">}</span><span·class="p"·data-group-id="4439965448-2">]</span></code></pre><p>If·a·URI·component·has·a·character·that·is·not·allowed,·it·will·be251 ·····</span><span·class="s">&quot;-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~&quot;</span><span·class="p"·data-group-id="2867016159-13">}</span><span·class="p"·data-group-id="2867016159-2">]</span></code></pre><p>If·a·URI·component·has·a·character·that·is·not·allowed,·it·will·be
252 percent-encoded·when·the·URI·is·produced:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">recompose</span><span·class="p"·data-group-id="1495010777-1">(</span><span·class="p"·data-group-id="1495010777-2">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;https&quot;</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·444,·SHA:·1c1bb0960541b4488ace95287109302ec01cf2c6b7f6a941a799afcbe0c256e4·...·]-1">)</span><span·class="p">.</span><span·class="w">252 percent-encoded·when·the·URI·is·produced:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">recompose</span><span·class="p"·data-group-id="3874973678-1">(</span><span·class="p"·data-group-id="3874973678-2">#{</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;https&quot;</span><span·class="p">,</span><span·clas[·...·truncated·by·diffoscope;·len:·444,·SHA:·bbc26969646adb2c7cc4c69b2cc86457b4bf560ca75c5e1df3e78f4ca148e60f·...·]-1">)</span><span·class="p">.</span><span·class="w">
253 ····</span><span·class="s">&quot;https://local%23host&quot;</span></code></pre><p>Consuming·a·URI·containing·percent-encoded·triplets·can·take·many·steps.·The253 ····</span><span·class="s">&quot;https://local%23host&quot;</span></code></pre><p>Consuming·a·URI·containing·percent-encoded·triplets·can·take·many·steps.·The
254 following·example·shows·how·to·handle·an·input·URI·that·is·not·normalized·and254 following·example·shows·how·to·handle·an·input·URI·that·is·not·normalized·and
255 contains·multiple·percent-encoded·triplets.·First,·the·input255 contains·multiple·percent-encoded·triplets.·First,·the·input
256 <a·href="uri_string.html#t:uri_string/0"><code·class="inline">uri_string()</code></a>·is·to·be·parsed·into·a256 <a·href="uri_string.html#t:uri_string/0"><code·class="inline">uri_string()</code></a>·is·to·be·parsed·into·a
257 <a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>.·The·parsing·only·splits·the·URI·into257 <a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>.·The·parsing·only·splits·the·URI·into
258 its·components·without·doing·any·decoding:</p><pre><code·class="text">····3&gt;·uri_string:parse(&quot;http://%6C%6Fcal%23host/%F6re%26bro%20&quot;).258 its·components·without·doing·any·decoding:</p><pre><code·class="text">····3&gt;·uri_string:parse(&quot;http://%6C%6Fcal%23host/%F6re%26bro%20&quot;).
259 ····#{host·=&gt;·&quot;%6C%6Fcal%23host&quot;,path·=&gt;·&quot;/%F6re%26bro%20&quot;,259 ····#{host·=&gt;·&quot;%6C%6Fcal%23host&quot;,path·=&gt;·&quot;/%F6re%26bro%20&quot;,
260 ······scheme·=&gt;·&quot;http&quot;}}</code></pre><p>The·input·is·a·valid·URI·but·how·can·you·decode·those·percent-encoded·octets?260 ······scheme·=&gt;·&quot;http&quot;}}</code></pre><p>The·input·is·a·valid·URI·but·how·can·you·decode·those·percent-encoded·octets?
261 You·can·try·to·normalize·the·input·with·<a·href="uri_string.html#normalize/1"><code·class="inline">uri_string:normalize/1</code></a>.·The·normalize261 You·can·try·to·normalize·the·input·with·<a·href="uri_string.html#normalize/1"><code·class="inline">uri_string:normalize/1</code></a>.·The·normalize
262 operation·decodes·those·percent-encoded·triplets·that·correspond·to·a·character262 operation·decodes·those·percent-encoded·triplets·that·correspond·to·a·character
263 in·the·unreserved·set.·Normalization·is·a·safe,·idempotent·operation·that263 in·the·unreserved·set.·Normalization·is·a·safe,·idempotent·operation·that
264 converts·a·URI·into·its·canonical·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="4407047680-1">(</span><span·class="s">&quot;http://%6C%6Fcal%23host/%F6re%26bro%20&quot;</span><span·class="p"·data-group-id="4407047680-1">)</span><span·class="p">.</span><span·class="w">264 converts·a·URI·into·its·canonical·form:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">4</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8008257722-1">(</span><span·class="s">&quot;http://%6C%6Fcal%23host/%F6re%26bro%20&quot;</span><span·class="p"·data-group-id="8008257722-1">)</span><span·class="p">.</span><span·class="w">
265 ····</span><span·class="s">&quot;http://local%23host/%F6re%26bro%20&quot;</span><span·class="w">265 ····</span><span·class="s">&quot;http://local%23host/%F6re%26bro%20&quot;</span><span·class="w">
266 ····</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="4407047680-2">(</span><span·class="s">&quot;http://%6C%6Fcal%23host/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4407047680-3">[</span><span·class="ss">return_map</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·68,·SHA:·88f611d70319ededd8b8a64865b507cd9206416cb66e2aa5c3e809bbe0319381·...·]-2">)</span><span·class="p">.</span><span·class="w">266 ····</span><span·class="mi">5</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">normalize</span><span·class="p"·data-group-id="8008257722-2">(</span><span·class="s">&quot;http://%6C%6Fcal%23host/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8008257722-3">[</span><span·class="ss">return_map</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·68,·SHA:·631a9d0d8969e305406bb10989b833255f9efbf7f166bb8c6450160d0da9cbd0·...·]-2">)</span><span·class="p">.</span><span·class="w">
267 ····</span><span·class="p"·data-group-id="4407047680-4">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;local%23host&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">267 ····</span><span·class="p"·data-group-id="8008257722-4">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;local%23host&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">
268 ······</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p"·data-group-id="4407047680-4">}</span></code></pre><p>There·are·still·a·few·percent-encoded·triplets·left·in·the·output.·At·this268 ······</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p"·data-group-id="8008257722-4">}</span></code></pre><p>There·are·still·a·few·percent-encoded·triplets·left·in·the·output.·At·this
269 point,·when·the·URI·is·already·parsed,·it·is·safe·to·apply·application·specific269 point,·when·the·URI·is·already·parsed,·it·is·safe·to·apply·application·specific
270 decoding·on·the·remaining·character·triplets.·Erlang/OTP·provides·a·function,270 decoding·on·the·remaining·character·triplets.·Erlang/OTP·provides·a·function,
271 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>·for·raw·percent·decoding·that·you·can·use·on·the271 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>·for·raw·percent·decoding·that·you·can·use·on·the
272 host·and·path·components,·or·on·the·whole·map:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="2463466123-1">(</span><span·class="s">&quot;local%23host&quot;</span><span·class="p"·data-group-id="2463466123-1">)</span><span·class="p">.</span><span·class="w">272 host·and·path·components,·or·on·the·whole·map:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">6</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="8152177495-1">(</span><span·class="s">&quot;local%23host&quot;</span><span·class="p"·data-group-id="8152177495-1">)</span><span·class="p">.</span><span·class="w">
273 ····</span><span·class="s">&quot;local#host&quot;</span><span·class="w">273 ····</span><span·class="s">&quot;local#host&quot;</span><span·class="w">
274 ····</span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="2463466123-2">(</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p"·data-group-id="2463466123-2">)</span><span·class="p">.</span><span·class="w">274 ····</span><span·class="mi">7</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="8152177495-2">(</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p"·data-group-id="8152177495-2">)</span><span·class="p">.</span><span·class="w">
275 ····</span><span·class="p"·data-group-id="2463466123-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">invalid_utf8</span><span·class="p">,</span><span·class="p"·data-group-id="2463466123-4">&lt;&lt;</span><span·class="s">&quot;/öre&amp;bro·&quot;</span><span·class="[·...·truncated·by·diffoscope;·len:·88,·SHA:·3f4e5b636bcbb3d623da6b6d7e69fcba663d8b705d3b6ecaee6a89f9ed0b8fcb·...·]-3">}</span><span·class="w">275 ····</span><span·class="p"·data-group-id="8152177495-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">invalid_utf8</span><span·class="p">,</span><span·class="p"·data-group-id="8152177495-4">&lt;&lt;</span><span·class="s">&quot;/öre&amp;bro·&quot;</span><span·class="[·...·truncated·by·diffoscope;·len:·88,·SHA:·4be69084eccc4159dd736003b65b238bbdb0cc7f37faa3663b4186a71a9e7215·...·]-3">}</span><span·class="w">
276 ····</span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="2463466123-5">(</span><span·class="p"·data-group-id="2463466123-6">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;local%23host&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">276 ····</span><span·class="mi">8</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="8152177495-5">(</span><span·class="p"·data-group-id="8152177495-6">#{</span><span·class="ss">host</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;local%23host&quot;</span><span·class="p">,</span><span·class="ss">path</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">
277 ····</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p"·data-group-id="2463466123-6">}</span><span·class="p"·data-group-id="2463466123-5">)</span><span·class="p">.</span><span·class="w">277 ····</span><span·class="ss">scheme</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="s">&quot;http&quot;</span><span·class="p"·data-group-id="8152177495-6">}</span><span·class="p"·data-group-id="8152177495-5">)</span><span·class="p">.</span><span·class="w">
278 ····</span><span·class="p"·data-group-id="2463466123-7">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="p"·data-group-id="2463466123-8">{</span><span·class="ss">invalid</span><span·class="p">,</span><span·class="p"·data-group-id="2463466123-9">{</span><span·class="ss">pat[·...·truncated·by·diffoscope;·len:·517,·SHA:·ab1b62558281a784e6f2262c31ef3221084933bafeecd6e44afb23ad2e6e940e·...·]-7">}</span></code></pre><p>The·<code·class="inline">host</code>·was·successfully·decoded·but·the·path·contains·at·least·one·character278 ····</span><span·class="p"·data-group-id="8152177495-7">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="p"·data-group-id="8152177495-8">{</span><span·class="ss">invalid</span><span·class="p">,</span><span·class="p"·data-group-id="8152177495-9">{</span><span·class="ss">pat[·...·truncated·by·diffoscope;·len:·517,·SHA:·7a823b4188c1d7884eed321e9d20a6252642f0c85e86ab5852a798dddbbbbd12·...·]-7">}</span></code></pre><p>The·<code·class="inline">host</code>·was·successfully·decoded·but·the·path·contains·at·least·one·character
279 with·non-UTF-8·encoding.·In·order·to·be·able·to·decode·this,·you·have·to·make279 with·non-UTF-8·encoding.·In·order·to·be·able·to·decode·this,·you·have·to·make
280 assumptions·about·the·encoding·used·in·these·triplets.·The·most·obvious·choice280 assumptions·about·the·encoding·used·in·these·triplets.·The·most·obvious·choice
281 is·<em>latin-1</em>,·so·you·can·try·<a·href="uri_string.html#transcode/2"><code·class="inline">uri_string:transcode/2</code></a>,·to·transcode·the·path·to281 is·<em>latin-1</em>,·so·you·can·try·<a·href="uri_string.html#transcode/2"><code·class="inline">uri_string:transcode/2</code></a>,·to·transcode·the·path·to
282 UTF-8·and·run·the·percent-decode·operation·on·the·transcoded·string:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">9</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">transcode</span><span·class="p"·data-group-id="8220675382-1">(</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8220675382-2">[</span><span·class="p"·data-group-id="8220675382-3">{</span><span·class="ss">in_encoding</[·...·truncated·by·diffoscope;·len:·229,·SHA:·24b8761377fbaf41efc8daf7d128c8db15c2360a44b254731cb84e13df5ecffd·...·]2-1">)</span><span·class="p">.</span><span·class="w">282 UTF-8·and·run·the·percent-decode·operation·on·the·transcoded·string:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">9</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">transcode</span><span·class="p"·data-group-id="5929150502-1">(</span><span·class="s">&quot;/%F6re%26bro%20&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5929150502-2">[</span><span·class="p"·data-group-id="5929150502-3">{</span><span·class="ss">in_encoding</[·...·truncated·by·diffoscope;·len:·229,·SHA:·f23f6864ad6583b35176d42519aac7cfe91b1ade8bc739031c13c642c55477d0·...·]2-1">)</span><span·class="p">.</span><span·class="w">
283 ····</span><span·class="s">&quot;/%C3%B6re%26bro%20&quot;</span><span·class="w">283 ····</span><span·class="s">&quot;/%C3%B6re%26bro%20&quot;</span><span·class="w">
284 ····</span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="8220675382-4">(</span><span·class="s">&quot;/%C3%B6re%26bro%20&quot;</span><span·class="p"·data-group-id="8220675382-4">)</span><span·class="p">.</span><span·class="w">284 ····</span><span·class="mi">10</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="5929150502-4">(</span><span·class="s">&quot;/%C3%B6re%26bro%20&quot;</span><span·class="p"·data-group-id="5929150502-4">)</span><span·class="p">.</span><span·class="w">
285 ····</span><span·class="s">&quot;/öre&amp;bro·&quot;</span></code></pre><p>It·is·important·to·emphasize·that·it·is·not·safe·to·apply285 ····</span><span·class="s">&quot;/öre&amp;bro·&quot;</span></code></pre><p>It·is·important·to·emphasize·that·it·is·not·safe·to·apply
286 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>·directly·on·an·input·URI:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">11</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="5401798342-1">(</span><span·class="s">&quot;http://%6C%6Fcal%23host/%C3%B6re%26bro%20&quot;</span><span·class="p"·data-group-id="5401798342-1">)</span><span·class="p">.</span><span·class="w">286 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>·directly·on·an·input·URI:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="mi">11</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">percent_decode</span><span·class="p"·data-group-id="9507517728-1">(</span><span·class="s">&quot;http://%6C%6Fcal%23host/%C3%B6re%26bro%20&quot;</span><span·class="p"·data-group-id="9507517728-1">)</span><span·class="p">.</span><span·class="w">
287 ····</span><span·class="s">&quot;http://local#host/öre&amp;bro·&quot;</span><span·class="w">287 ····</span><span·class="s">&quot;http://local#host/öre&amp;bro·&quot;</span><span·class="w">
288 ····</span><span·class="mi">12</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="5401798342-2">(</span><span·class="s">&quot;http://local#host/öre&amp;bro·&quot;</span><span·class="p"·data-group-id="5401798342-2">)</span><span·class="p">.</span><span·class="w">288 ····</span><span·class="mi">12</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="nc">uri_string</span><span·class="p">:</span><span·class="nf">parse</span><span·class="p"·data-group-id="9507517728-2">(</span><span·class="s">&quot;http://local#host/öre&amp;bro·&quot;</span><span·class="p"·data-group-id="9507517728-2">)</span><span·class="p">.</span><span·class="w">
289 ····</span><span·class="p"·data-group-id="5401798342-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">invalid_uri</span><span·class="p">,</span><span·class="s">&quot;:&quot;</span><span·class="p"·data-group-id="5401798342-3">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Percent-encoding·is·implemented·in·<a·href="uri_string.html#recompose/1"><code·class="inline">uri_string:recompose/1</code></a>·and·it·happens289 ····</span><span·class="p"·data-group-id="9507517728-3">{</span><span·class="ss">error</span><span·class="p">,</span><span·class="ss">invalid_uri</span><span·class="p">,</span><span·class="s">&quot;:&quot;</span><span·class="p"·data-group-id="9507517728-3">}</span></code></pre><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>Percent-encoding·is·implemented·in·<a·href="uri_string.html#recompose/1"><code·class="inline">uri_string:recompose/1</code></a>·and·it·happens
290 when·converting·a·<a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>·into·a290 when·converting·a·<a·href="uri_string.html#t:uri_map/0"><code·class="inline">uri_map()</code></a>·into·a
291 <a·href="uri_string.html#t:uri_string/0"><code·class="inline">uri_string()</code></a>.·Applying·any·percent-encoding291 <a·href="uri_string.html#t:uri_string/0"><code·class="inline">uri_string()</code></a>.·Applying·any·percent-encoding
292 directly·on·an·input·URI·would·not·be·safe·just·as·in·the·case·of292 directly·on·an·input·URI·would·not·be·safe·just·as·in·the·case·of
293 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>,·the·output·could·be·an·invalid·URI.·Quoting293 <a·href="uri_string.html#percent_decode/1"><code·class="inline">uri_string:percent_decode/1</code></a>,·the·output·could·be·an·invalid·URI.·Quoting
294 functions·allow·users·to·perform·raw·percent·encoding·and·decoding·on294 functions·allow·users·to·perform·raw·percent·encoding·and·decoding·on
295 application·data·which·cannot·be·handled·automatically·by295 application·data·which·cannot·be·handled·automatically·by
296 <a·href="uri_string.html#recompose/1"><code·class="inline">uri_string:recompose/1</code></a>.·For·example·in·scenario·when·user·would·need·to·use296 <a·href="uri_string.html#recompose/1"><code·class="inline">uri_string:recompose/1</code></a>.·For·example·in·scenario·when·user·would·need·to·use
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378 ······<p·class="built-using">378 ······<p·class="built-using">
379 ········Built·using379 ········Built·using
380 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the380 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
381 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>381 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
382 ······</p>382 ······</p>
383 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>383 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
384 ····</footer>384 ····</footer>
385 ··</div>385 ··</div>
386 </main>386 </main>
387 </div>387 </div>
388 <script>388 <script>
389 ··function·mermaidLoaded()·{389 ··function·mermaidLoaded()·{
390 ····mermaid.initialize({390 ····mermaid.initialize({
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882 ······<p·class="built-using">882 ······<p·class="built-using">
883 ········Built·using883 ········Built·using
884 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the884 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
885 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>885 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
886 ······</p>886 ······</p>
887 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>887 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
888 ····</footer>888 ····</footer>
889 ··</div>889 ··</div>
890 </main>890 </main>
891 </div>891 </div>
892 <script>892 <script>
893 ··function·mermaidLoaded()·{893 ··function·mermaidLoaded()·{
894 ····mermaid.initialize({894 ····mermaid.initialize({
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1020 <code·class="inline">Archive</code>,·starting·with·<code·class="inline">AccIn·==·Acc0</code>.</p><p><code·class="inline">FileInArchive</code>·is·the·name·that·the·file·has·in·the·archive.</p><p><code·class="inline">GetInfo</code>·is·a·fun·that·returns·information·about·the·file.</p><p><code·class="inline">GetBin</code>·returns·the·file·contents.</p><p>Both·<code·class="inline">GetInfo</code>·and·<code·class="inline">GetBin</code>·must·be·called·within·the·<code·class="inline">Fun</code>.·Their·behavior·is1020 <code·class="inline">Archive</code>,·starting·with·<code·class="inline">AccIn·==·Acc0</code>.</p><p><code·class="inline">FileInArchive</code>·is·the·name·that·the·file·has·in·the·archive.</p><p><code·class="inline">GetInfo</code>·is·a·fun·that·returns·information·about·the·file.</p><p><code·class="inline">GetBin</code>·returns·the·file·contents.</p><p>Both·<code·class="inline">GetInfo</code>·and·<code·class="inline">GetBin</code>·must·be·called·within·the·<code·class="inline">Fun</code>.·Their·behavior·is
1021 undefined·if·they·are·called·outside·the·context·of·<code·class="inline">Fun</code>.</p><p>The·<code·class="inline">Fun</code>·must·return·a·new·accumulator,·which·is·passed·to·the·next·call.1021 undefined·if·they·are·called·outside·the·context·of·<code·class="inline">Fun</code>.</p><p>The·<code·class="inline">Fun</code>·must·return·a·new·accumulator,·which·is·passed·to·the·next·call.
1022 <a·href="#foldl/3"><code·class="inline">foldl/3</code></a>·returns·the·final·accumulator·value.·<code·class="inline">Acc0</code>·is·returned1022 <a·href="#foldl/3"><code·class="inline">foldl/3</code></a>·returns·the·final·accumulator·value.·<code·class="inline">Acc0</code>·is·returned
1023 if·the·archive·is·empty.·It·is·not·necessary·to·iterate·over·all·files·in·the1023 if·the·archive·is·empty.·It·is·not·necessary·to·iterate·over·all·files·in·the
1024 archive.·The·iteration·can·be·ended·prematurely·in·a·controlled·manner·by1024 archive.·The·iteration·can·be·ended·prematurely·in·a·controlled·manner·by
1025 throwing·an·exception.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;dummy.zip&quot;</span><span·class="p">.</span><span·class="w">1025 throwing·an·exception.</p><p><em>Example:</em></p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">&gt;·</span><span·class="n">Name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="s">&quot;dummy.zip&quot;</span><span·class="p">.</span><span·class="w">
1026 </span><span·class="s">&quot;dummy.zip&quot;</span><span·class="gp·unselectable">1026 </span><span·class="s">&quot;dummy.zip&quot;</span><span·class="gp·unselectable">
1027 &gt;·</span><span·class="p"·data-group-id="0746039007-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0746039007-2">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·[·...·truncated·by·diffoscope;·len:·1460,·SHA:·2504cc0ef5b51d663fee54cb193b42b404d5bc77e9199b224e08638ab4c08997·...·]-3">)</span><span·class="p">.</span><span·class="w">1027 &gt;·</span><span·class="p"·data-group-id="4633693042-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4633693042-2">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><span·[·...·truncated·by·diffoscope;·len:·1460,·SHA:·61dddd904dbe4d1bf5789c9216f833d9b91d7ec3a18a767613a32adcc513cd9b·...·]-3">)</span><span·class="p">.</span><span·class="w">
1028 </span><span·class="p"·data-group-id="0746039007-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0746039007-11">{</span><span·class="s">&quot;dummy.zip&quot;</span><span·class="p">,</span><span·class="w">1028 </span><span·class="p"·data-group-id="4633693042-10">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4633693042-11">{</span><span·class="s">&quot;dummy.zip&quot;</span><span·class="p">,</span><span·class="w">
1029 ·····</span><span·class="p"·data-group-id="0746039007-12">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">74</span><span·class="p">,</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">171</span><span·class="p">,</span><span·class="mi">39</span><span·class="p">,</span><span·class="mi">212</span><span·class="p">,</span><span·class="mi">26</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">1029 ·····</span><span·class="p"·data-group-id="4633693042-12">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">74</span><span·class="p">,</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">171</span><span·class="p">,</span><span·class="mi">39</span><span·class="p">,</span><span·class="mi">212</span><span·class="p">,</span><span·class="mi">26</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
1030 ·······</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0746039007-12">&gt;&gt;</span><span·class="p"·data-group-id="0746039007-11">}</span><span·class="p"·data-group-id="0746039007-10">}</span><span·class="gp·unselectable">1030 ·······</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="4633693042-12">&gt;&gt;</span><span·class="p"·data-group-id="4633693042-11">}</span><span·class="p"·data-group-id="4633693042-10">}</span><span·class="gp·unselectable">
1031 &gt;·</span><span·class="p"·data-group-id="0746039007-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FileSpec</span><span·class="p"·data-group-id="0746039007-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·1787,·SHA:·3ca77dd9014b8ecad2a91e42e424d431635bd549d91f97e6188901b5b72dbb69·...·]-14">)</span><span·class="p">.</span><span·class="w">1031 &gt;·</span><span·class="p"·data-group-id="4633693042-13">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FileSpec</span><span·class="p"·data-group-id="4633693042-13">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·1787,·SHA:·079afa6638b1c6b73f2035670f7dab2c19e677118bdb44631889b38fa4df8f31·...·]-14">)</span><span·class="p">.</span><span·class="w">
1032 </span><span·class="p"·data-group-id="0746039007-22">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0746039007-23">[</span><span·class="p"·data-group-id="0746039007-24">{</span><span·class="s">&quot;bar&quot;</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·127,·SHA:·53eb56adefaa43805f6a9a5075ac6ef27821671ca18448b4fc928d4a14388a67·...·]-25">&gt;&gt;</span><span·class="p">,</span><span·class="w">1032 </span><span·class="p"·data-group-id="4633693042-22">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4633693042-23">[</span><span·class="p"·data-group-id="4633693042-24">{</span><span·class="s">&quot;bar&quot;</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·127,·SHA:·ddfe855dd441e0a8e174f2fc1fb407c169ce80c64cf6ab7972b932393363b570·...·]-25">&gt;&gt;</span><span·class="p">,</span><span·class="w">
1033 ······</span><span·class="p"·data-group-id="0746039007-26">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">1033 ······</span><span·class="p"·data-group-id="4633693042-26">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">
1034 ·················</span><span·class="p"·data-group-id="0746039007-27">{</span><span·class="p"·data-group-id="0746039007-28">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0746039007-28">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·d4043c0c2943ea55c5eebda8ad99298e64b8b89f00c4258128fe15135772238c·...·]-27">}</span><span·class="p">,</span><span·class="w">1034 ·················</span><span·class="p"·data-group-id="4633693042-27">{</span><span·class="p"·data-group-id="4633693042-28">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="4633693042-28">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·6177ba58bdc57734e99887c6d5240976c9f49a99cd6a49948bc3ade166e6d6d5·...·]-27">}</span><span·class="p">,</span><span·class="w">
1035 ·················</span><span·class="p"·data-group-id="0746039007-30">{</span><span·class="p"·data-group-id="0746039007-31">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0746039007-31">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·fd2721be12ba56de23acdad73ffe8bcf13280575ff991f1b0946b027f45eea4f·...·]-30">}</span><span·class="p">,</span><span·class="w">1035 ·················</span><span·class="p"·data-group-id="4633693042-30">{</span><span·class="p"·data-group-id="4633693042-31">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="4633693042-31">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·d69296f33e46edb568f3cc18cc4341103c9a1eabda52753b481d6f3f69af1806·...·]-30">}</span><span·class="p">,</span><span·class="w">
1036 ·················</span><span·class="p"·data-group-id="0746039007-33">{</span><span·class="p"·data-group-id="0746039007-34">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0746039007-34">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·62f0a3aae1efb78c72942adbab8d66ab2ff1324d2cc6c9d3628c9b4b87fc0190·...·]-33">}</span><span·class="p">,</span><span·class="w">1036 ·················</span><span·class="p"·data-group-id="4633693042-33">{</span><span·class="p"·data-group-id="4633693042-34">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="4633693042-34">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·ca8fa525c0e3d7350ec8c679c7276244606b96f115fa03962ed485473e5dee82·...·]-33">}</span><span·class="p">,</span><span·class="w">
1037 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="0746039007-26">}</span><span·class="p"·data-group-id="0746039007-24">}</span><span·class="p">,</span><span·class="w">1037 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="4633693042-26">}</span><span·class="p"·data-group-id="4633693042-24">}</span><span·class="p">,</span><span·class="w">
1038 ·····</span><span·class="p"·data-group-id="0746039007-36">{</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="0746039007-37">&lt;&lt;</span><span·class="s">&quot;FOO&quot;</span><span·class="p"·data-group-id="0746039007-37">&gt;&gt;</span><span·class="p">,</span><span·class="w">1038 ·····</span><span·class="p"·data-group-id="4633693042-36">{</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="4633693042-37">&lt;&lt;</span><span·class="s">&quot;FOO&quot;</span><span·class="p"·data-group-id="4633693042-37">&gt;&gt;</span><span·class="p">,</span><span·class="w">
1039 ······</span><span·class="p"·data-group-id="0746039007-38">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">1039 ······</span><span·class="p"·data-group-id="4633693042-38">{</span><span·class="ss">file_info</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="ss">regular</span><span·class="p">,</span><span·class="ss">read_write</span><span·class="p">,</span><span·class="w">
1040 ·················</span><span·class="p"·data-group-id="0746039007-39">{</span><span·class="p"·data-group-id="0746039007-40">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0746039007-40">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·e9e2a76ef6758b9da1590b097e76ff9bf0989b1cab5b99caa1a27e12782ef1df·...·]-39">}</span><span·class="p">,</span><span·class="w">1040 ·················</span><span·class="p"·data-group-id="4633693042-39">{</span><span·class="p"·data-group-id="4633693042-40">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="4633693042-40">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·035f1f1f65476104518a8ad8f22085391c225f22691bf6965a65b7074b0a8186·...·]-39">}</span><span·class="p">,</span><span·class="w">
1041 ·················</span><span·class="p"·data-group-id="0746039007-42">{</span><span·class="p"·data-group-id="0746039007-43">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0746039007-43">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·11800ae06ba723c029db2a5fad1c8dc4df59c68c022035a332c25ae9607dc26d·...·]-42">}</span><span·class="p">,</span><span·class="w">1041 ·················</span><span·class="p"·data-group-id="4633693042-42">{</span><span·class="p"·data-group-id="4633693042-43">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="4633693042-43">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·2ba1426b002cd3f3e13df512b8d40e95e6cd3258b1bc8f60b15e495c77005206·...·]-42">}</span><span·class="p">,</span><span·class="w">
1042 ·················</span><span·class="p"·data-group-id="0746039007-45">{</span><span·class="p"·data-group-id="0746039007-46">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="0746039007-46">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·2d32455326b6a3087224a374c08e8ea4b141a3fcd9a1ef9e07e59a5581dfe9ae·...·]-45">}</span><span·class="p">,</span><span·class="w">1042 ·················</span><span·class="p"·data-group-id="4633693042-45">{</span><span·class="p"·data-group-id="4633693042-46">{</span><span·class="mi">2010</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="4633693042-46">}</span[·...·truncated·by·diffoscope;·len:·299,·SHA:·9267c6b2fc4c3f0391e0595b416697f057b9488c6f5a26e9fd447a2200a77e26·...·]-45">}</span><span·class="p">,</span><span·class="w">
1043 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="0746039007-38">}</span><span·class="p"·data-group-id="0746039007-36">}</span><span·class="p"·data-group-id="0746039007-23">]</span><span·class="p"·data-group-id="0746039007-22">}</span><span·class="gp·unselectable">1043 ·················</span><span·class="mi">54</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="4633693042-38">}</span><span·class="p"·data-group-id="4633693042-36">}</span><span·class="p"·data-group-id="4633693042-23">]</span><span·class="p"·data-group-id="4633693042-22">}</span><span·class="gp·unselectable">
1044 &gt;·</span><span·class="p"·data-group-id="0746039007-48">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0746039007-49">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><spa[·...·truncated·by·diffoscope;·len:·836,·SHA:·8b2e570341a00a12c3fefc44ce0b05d4c79178c0ec3fed12f0a6d942f77e4291·...·]-50">)</span><span·class="p">.</span><span·class="w">1044 &gt;·</span><span·class="p"·data-group-id="4633693042-48">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4633693042-49">{</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Bin</span><spa[·...·truncated·by·diffoscope;·len:·836,·SHA:·482ceaa80e084023353dbf403d5e214da27d4a3c9742df525304f4628313d3ed·...·]-50">)</span><span·class="p">.</span><span·class="w">
1045 </span><span·class="p"·data-group-id="0746039007-53">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0746039007-54">{</span><span·class="s">&quot;dummy.zip&quot;</span><span·class="p">,</span><span·class="w">1045 </span><span·class="p"·data-group-id="4633693042-53">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4633693042-54">{</span><span·class="s">&quot;dummy.zip&quot;</span><span·class="p">,</span><span·class="w">
1046 ·····</span><span·class="p"·data-group-id="0746039007-55">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">74</span><span·class="p">,</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">171</span><span·class="p">,</span><span·class="mi">39</span><span·class="p">,</span><span·class="mi">212</span><span·class="p">,</span><span·class="mi">26</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">1046 ·····</span><span·class="p"·data-group-id="4633693042-55">&lt;&lt;</span><span·class="mi">80</span><span·class="p">,</span><span·class="mi">75</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">4</span><span·class="p">,</span><span·class="mi">20</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">74</span><span·class="p">,</span><span·class="mi">152</span><span·class="p">,</span><span·class="mi">97</span><span·class="p">,</span><span·class="mi">60</span><span·class="p">,</span><span·class="mi">171</span><span·class="p">,</span><span·class="mi">39</span><span·class="p">,</span><span·class="mi">212</span><span·class="p">,</span><span·class="mi">26</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
1047 ·······</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0746039007-55">&gt;&gt;</span><span·class="p"·data-group-id="0746039007-54">}</span><span·class="p"·data-group-id="0746039007-53">}</span><span·class="gp·unselectable">1047 ·······</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="4633693042-55">&gt;&gt;</span><span·class="p"·data-group-id="4633693042-54">}</span><span·class="p"·data-group-id="4633693042-53">}</span><span·class="gp·unselectable">
1048 &gt;·</span><span·class="k">catch</span><span·class="w">·</span><span·class="nc">zip</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="0746039007-56">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="0746039007-57">(</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·1433,·SHA:·6552ae7237e396e081b8ae969dc20155833a5d116b6da4df2dae112977f7039e·...·]-56">)</span><span·class="p">.</span><span·class="w">1048 &gt;·</span><span·class="k">catch</span><span·class="w">·</span><span·class="nc">zip</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="4633693042-56">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4633693042-57">(</span><span·class="s">&quot;foo&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·1433,·SHA:·8b93d0bd9c181b2223bb328cbaf8f941ec7ec4fffdf4eed48fed49142b04dc57·...·]-56">)</span><span·class="p">.</span><span·class="w">
1049 </span><span·class="p"·data-group-id="0746039007-63">&lt;&lt;</span><span·class="s">&quot;FOO&quot;</span><span·class="p"·data-group-id="0746039007-63">&gt;&gt;</span></code></pre>1049 </span><span·class="p"·data-group-id="4633693042-63">&lt;&lt;</span><span·class="s">&quot;FOO&quot;</span><span·class="p"·data-group-id="4633693042-63">&gt;&gt;</span></code></pre>
1050 ··</section>1050 ··</section>
1051 </section>1051 </section>
1052 <section·class="detail"·id="list_dir/1">1052 <section·class="detail"·id="list_dir/1">
  
1053 ··<div·class="detail-header">1053 ··<div·class="detail-header">
1054 ····<a·href="#list_dir/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1054 ····<a·href="#list_dir/1"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1055 ······<i·class="ri-link-m"·aria-hidden="true"></i>1055 ······<i·class="ri-link-m"·aria-hidden="true"></i>
Offset 1619, 15 lines modifiedOffset 1619, 15 lines modified
1619 ······<p·class="built-using">1619 ······<p·class="built-using">
1620 ········Built·using1620 ········Built·using
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864 ··function·mermaidLoaded()·{864 ··function·mermaidLoaded()·{
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438 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>438 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
439 ····</footer>439 ····</footer>
440 ··</div>440 ··</div>
441 </main>441 </main>
442 </div>442 </div>
443 <script>443 <script>
444 ··function·mermaidLoaded()·{444 ··function·mermaidLoaded()·{
445 ····mermaid.initialize({445 ····mermaid.initialize({
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974 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>974 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
975 ····</footer>975 ····</footer>
976 ··</div>976 ··</div>
977 </main>977 </main>
978 </div>978 </div>
979 <script>979 <script>
980 ··function·mermaidLoaded()·{980 ··function·mermaidLoaded()·{
981 ····mermaid.initialize({981 ····mermaid.initialize({
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383 ······</p>383 ······</p>
384 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>384 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
385 ····</footer>385 ····</footer>
386 ··</div>386 ··</div>
387 </main>387 </main>
388 </div>388 </div>
389 <script>389 <script>
390 ··function·mermaidLoaded()·{390 ··function·mermaidLoaded()·{
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6602 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_postcomments(<a·href="#t:syntaxTree/0">syntaxTree</a>())·->·[<a·href="#t:syntaxTree/0">syntaxTree</a>()].</pre>6602 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_postcomments(<a·href="#t:syntaxTree/0">syntaxTree</a>())·->·[<a·href="#t:syntaxTree/0">syntaxTree</a>()].</pre>
  
6603 ······</div>6603 ······</div>
  
6604 <p>Returns·the·associated·post-comments·of·a·node.</p><p>This·is·a·possibly·empty·list·of·abstract·comments,·in·top-down6604 <p>Returns·the·associated·post-comments·of·a·node.</p><p>This·is·a·possibly·empty·list·of·abstract·comments,·in·top-down
6605 textual·order.·When·the·code·is·formatted,·post-comments·are·typically6605 textual·order.·When·the·code·is·formatted,·post-comments·are·typically
6606 displayed·to·the·right·of·and/or·below·the·node.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4467135786-1">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="4467135786-1">}</span><span·class="w">·····</span><span·class="c1">%·Post-comment·of·tuple</span></code></pre><p>If·possible,·the·comment·should·be·moved·past·any·following·separator·characters6606 displayed·to·the·right·of·and/or·below·the·node.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7868355330-1">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="n">X</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Y</span><span·class="p"·data-group-id="7868355330-1">}</span><span·class="w">·····</span><span·class="c1">%·Post-comment·of·tuple</span></code></pre><p>If·possible,·the·comment·should·be·moved·past·any·following·separator·characters
6607 on·the·same·line,·rather·than·placing·the·separators·on·the·following·line.6607 on·the·same·line,·rather·than·placing·the·separators·on·the·following·line.
6608 For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="7151793243-1">(</span><span·class="p"·data-group-id="7151793243-2">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Xs</span><span·class="p"·data-group-id="7151793243-2">]</span><span·c[·...·truncated·by·diffoscope;·len:·106,·SHA:·6e7eb4f3887012d05b1afeb9e1c6b69cad4cb0106036dc2db2c75545fe90e2b6·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">6608 For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="5600696046-1">(</span><span·class="p"·data-group-id="5600696046-2">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Xs</span><span·class="p"·data-group-id="5600696046-2">]</span><span·c[·...·truncated·by·diffoscope;·len:·106,·SHA:·169004142279abc924148a8920e232ffc75c8d12964dd73dfd0de4e5238aab7e·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
6609 ····</span><span·class="nf">foo</span><span·class="p"·data-group-id="7151793243-3">(</span><span·class="n">Xs</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">bar</span><span·class="p"·data-group-id="7151793243-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="7151793243-4">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·ba2065c723b07e758aba84996beff63f179532522abfdf023669d64b9b82e66c·...·]-3">)</span><span·class="p">;</span><span·class="w">·····</span><span·class="c1">%·Post-comment·of·&#39;bar(X)&#39;·node</span><span·class="w">6609 ····</span><span·class="nf">foo</span><span·class="p"·data-group-id="5600696046-3">(</span><span·class="n">Xs</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">bar</span><span·class="p"·data-group-id="5600696046-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="5600696046-4">)</span><spa[·...·truncated·by·diffoscope;·len:·37,·SHA:·4d6a65a6196b172bfff4f37a9524c8b615534f85bbe6c3fcc10883d076d0c3e7·...·]-3">)</span><span·class="p">;</span><span·class="w">·····</span><span·class="c1">%·Post-comment·of·&#39;bar(X)&#39;·node</span><span·class="w">
6610 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>(where·the·comment·is·moved·past·the·rightmost·&quot;<code·class="inline">)</code>&quot;·and·the·&quot;<code·class="inline">;</code>&quot;).</p><p><em>See·also:·</em><a·href="#comment/2"><code·class="inline">comment/2</code></a>,·<a·href="#get_attrs/1"><code·class="inline">get_attrs/1</code></a>,·<a·href="#get_precomments/1"><code·class="inline">get_precomments/1</code></a>,6610 ·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>(where·the·comment·is·moved·past·the·rightmost·&quot;<code·class="inline">)</code>&quot;·and·the·&quot;<code·class="inline">;</code>&quot;).</p><p><em>See·also:·</em><a·href="#comment/2"><code·class="inline">comment/2</code></a>,·<a·href="#get_attrs/1"><code·class="inline">get_attrs/1</code></a>,·<a·href="#get_precomments/1"><code·class="inline">get_precomments/1</code></a>,
6611 <a·href="#set_postcomments/2"><code·class="inline">set_postcomments/2</code></a>.</p>6611 <a·href="#set_postcomments/2"><code·class="inline">set_postcomments/2</code></a>.</p>
6612 ··</section>6612 ··</section>
6613 </section>6613 </section>
6614 <section·class="detail"·id="get_precomments/1">6614 <section·class="detail"·id="get_precomments/1">
  
6615 ··<div·class="detail-header">6615 ··<div·class="detail-header">
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6636 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_precomments(<a·href="#t:syntaxTree/0">syntaxTree</a>())·->·[<a·href="#t:syntaxTree/0">syntaxTree</a>()].</pre>6636 ··········<pre·translate="no"><span·class="attribute">-spec</span>·get_precomments(<a·href="#t:syntaxTree/0">syntaxTree</a>())·->·[<a·href="#t:syntaxTree/0">syntaxTree</a>()].</pre>
  
6637 ······</div>6637 ······</div>
  
6638 <p>Returns·the·associated·pre-comments·of·a·node.</p><p>This·is·a·possibly·empty·list·of·abstract·comments,·in·top-down6638 <p>Returns·the·associated·pre-comments·of·a·node.</p><p>This·is·a·possibly·empty·list·of·abstract·comments,·in·top-down
6639 textual·order.·When·the·code·is·formatted,·pre-comments·are·typically6639 textual·order.·When·the·code·is·formatted,·pre-comments·are·typically
6640 displayed·directly·above·the·node.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·Pre-comment·of·function</span><span·class="w">6640 displayed·directly·above·the·node.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·Pre-comment·of·function</span><span·class="w">
6641 </span><span·class="nf">foo</span><span·class="p"·data-group-id="5192465500-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="5192465500-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="5192465500-2">{</span><span·class="ss">bar</span><[·...·truncated·by·diffoscope;·len:·112,·SHA:·7f15e7dee088c2a0643e8ce6c73381d15ad8b50f0dbbd456c2e208445339cf42·...·]-2">}</span><span·class="p">.</span></code></pre><p>If·possible,·the·comment·should·be·moved·before·any·preceding·separator6641 </span><span·class="nf">foo</span><span·class="p"·data-group-id="7552119696-1">(</span><span·class="n">X</span><span·class="p"·data-group-id="7552119696-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="7552119696-2">{</span><span·class="ss">bar</span><[·...·truncated·by·diffoscope;·len:·112,·SHA:·d1d4a5dc4fb87875d5e13ad74bb01c2c022417dbae425a0846f3ffafd67fddd0·...·]-2">}</span><span·class="p">.</span></code></pre><p>If·possible,·the·comment·should·be·moved·before·any·preceding·separator
6642 characters·on·the·same·line.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="7148273935-1">(</span><span·class="p"·data-group-id="7148273935-2">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Xs</span><span·class="p"·data-group-id="7148273935-2">]</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·07ef607e30a5537f847665c0eb44debc7881ba86f4f22634ef446ca5e0da1c50·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">6642 characters·on·the·same·line.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">foo</span><span·class="p"·data-group-id="4584928118-1">(</span><span·class="p"·data-group-id="4584928118-2">[</span><span·class="n">X</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Xs</span><span·class="p"·data-group-id="4584928118-2">]</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·bc10fb258ab8367db74761d2ba4b49ad066385a808ed3942fffdce4cf64b5f81·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
6643 ····</span><span·class="c1">%·Pre-comment·of·&#39;bar(X)&#39;·node</span><span·class="w">6643 ····</span><span·class="c1">%·Pre-comment·of·&#39;bar(X)&#39;·node</span><span·class="w">
6644 ····</span><span·class="p"·data-group-id="7148273935-3">[</span><span·class="nf">bar</span><span·class="p"·data-group-id="7148273935-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="7148273935-4">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·194,·SHA:·49c1a0d0549bafa99908a84362bdf4fae519b2a30b0c3f5f481fc9a7b0fe72f7·...·]-3">]</span><span·class="p">;</span><span·class="w">6644 ····</span><span·class="p"·data-group-id="4584928118-3">[</span><span·class="nf">bar</span><span·class="p"·data-group-id="4584928118-4">(</span><span·class="n">X</span><span·class="p"·data-group-id="4584928118-4">)</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·194,·SHA:·a6b269716a34672a1b495cb5874752bbd99e7053628d1cd05523e721adbb9008·...·]-3">]</span><span·class="p">;</span><span·class="w">
6645 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>(where·the·comment·is·moved·before·the·&quot;<code·class="inline">[</code>&quot;).</p><p><em>See·also:·</em><a·href="#comment/2"><code·class="inline">comment/2</code></a>,·<a·href="#get_attrs/1"><code·class="inline">get_attrs/1</code></a>,·<a·href="#get_postcomments/1"><code·class="inline">get_postcomments/1</code></a>,6645 </span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>(where·the·comment·is·moved·before·the·&quot;<code·class="inline">[</code>&quot;).</p><p><em>See·also:·</em><a·href="#comment/2"><code·class="inline">comment/2</code></a>,·<a·href="#get_attrs/1"><code·class="inline">get_attrs/1</code></a>,·<a·href="#get_postcomments/1"><code·class="inline">get_postcomments/1</code></a>,
6646 <a·href="#set_precomments/2"><code·class="inline">set_precomments/2</code></a>.</p>6646 <a·href="#set_precomments/2"><code·class="inline">set_precomments/2</code></a>.</p>
6647 ··</section>6647 ··</section>
6648 </section>6648 </section>
6649 <section·class="detail"·id="has_comments/1">6649 <section·class="detail"·id="has_comments/1">
  
6650 ··<div·class="detail-header">6650 ··<div·class="detail-header">
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11543 ······<p·class="built-using">11543 ······<p·class="built-using">
11544 ········Built·using11544 ········Built·using
11545 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the11545 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
11546 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>11546 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
11547 ······</p>11547 ······</p>
11548 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>11548 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
11549 ····</footer>11549 ····</footer>
11550 ··</div>11550 ··</div>
11551 </main>11551 </main>
11552 </div>11552 </div>
11553 <script>11553 <script>
11554 ··function·mermaidLoaded()·{11554 ··function·mermaidLoaded()·{
11555 ····mermaid.initialize({11555 ····mermaid.initialize({
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2389 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2389 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2390 ······</p>2390 ······</p>
2391 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2391 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2392 ····</footer>2392 ····</footer>
2393 ··</div>2393 ··</div>
2394 </main>2394 </main>
2395 </div>2395 </div>
2396 <script>2396 <script>
2397 ··function·mermaidLoaded()·{2397 ··function·mermaidLoaded()·{
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134 Merl·itself,·see·the·documentation·of·<a·href="erl_syntax.html"><code·class="inline">erl_syntax</code></a>.</p><h3·id="module-quick-start"·class="section-heading">134 Merl·itself,·see·the·documentation·of·<a·href="erl_syntax.html"><code·class="inline">erl_syntax</code></a>.</p><h3·id="module-quick-start"·class="section-heading">
135 ··<a·href="#module-quick-start"·class="hover-link">135 ··<a·href="#module-quick-start"·class="hover-link">
136 ····<i·class="ri-link-m"·aria-hidden="true"></i>136 ····<i·class="ri-link-m"·aria-hidden="true"></i>
137 ··</a>137 ··</a>
138 ··<span·class="text">Quick·start</span>138 ··<span·class="text">Quick·start</span>
139 </h3>139 </h3>
140 <p>To·enable·the·full·power·of·Merl,·your·module·needs·to·include·the·Merl·header140 <p>To·enable·the·full·power·of·Merl,·your·module·needs·to·include·the·Merl·header
141 file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="3968146010-1">(</span><span·class="s">&quot;syntax_tools/include/merl.hrl&quot;</span><span·class="p"·data-group-id="3968146010-1">)</span><span·class="p">.</span></code></pre><p>Then,·you·can·use·the·<code·class="inline">?Q(Text)</code>·macros·in·your·code·to·create·ASTs·or·match·on141 file:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include_lib</span><span·class="p"·data-group-id="6833380906-1">(</span><span·class="s">&quot;syntax_tools/include/merl.hrl&quot;</span><span·class="p"·data-group-id="6833380906-1">)</span><span·class="p">.</span></code></pre><p>Then,·you·can·use·the·<code·class="inline">?Q(Text)</code>·macros·in·your·code·to·create·ASTs·or·match·on
142 existing·ASTs.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tuple</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9111442826-1">(</span><span·class="s">&quot;{foo,·42}&quot;</span><span·class="p"·data-group-id="9111442826-1">)</span><span·class="p">,</span><span·class="w">142 existing·ASTs.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tuple</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7138650597-1">(</span><span·class="s">&quot;{foo,·42}&quot;</span><span·class="p"·data-group-id="7138650597-1">)</span><span·class="p">,</span><span·class="w">
143 </span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9111442826-2">(</span><span·class="s">&quot;{foo,·_@Number}&quot;</span><span·class="p"·data-group-id="9111442826-2">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Tuple</span><span·class="p">,</span><span·class="w">143 </span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7138650597-2">(</span><span·class="s">&quot;{foo,·_@Number}&quot;</span><span·class="p"·data-group-id="7138650597-2">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Tuple</span><span·class="p">,</span><span·class="w">
144 </span><span·class="n">Call</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9111442826-3">(</span><span·class="s">&quot;foo:bar(_@Number)&quot;</span><span·class="p"·data-group-id="9111442826-3">)</span></code></pre><p>Calling·<code·class="inline">merl:print(Call)</code>·will·then·print·the·following·code:</p><pre><code·class="mak[·...·truncated·by·diffoscope;·len:·225,·SHA:·be6f2e317adc07013565e7768da67296525f8bd5e1c2832556ce402a58d6422b·...·]-1">)</span></code></pre><p>The·<code·class="inline">?Q</code>·macros·turn·the·quoted·code·fragments·into·ASTs,·and·lifts144 </span><span·class="n">Call</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7138650597-3">(</span><span·class="s">&quot;foo:bar(_@Number)&quot;</span><span·class="p"·data-group-id="7138650597-3">)</span></code></pre><p>Calling·<code·class="inline">merl:print(Call)</code>·will·then·print·the·following·code:</p><pre><code·class="mak[·...·truncated·by·diffoscope;·len:·225,·SHA:·0b3fdee55b588b589010f36c5e048b9bb4fed384ee68d93fafae0e4de7ebac7d·...·]-1">)</span></code></pre><p>The·<code·class="inline">?Q</code>·macros·turn·the·quoted·code·fragments·into·ASTs,·and·lifts
145 metavariables·such·as·<code·class="inline">_@Tuple</code>·and·<code·class="inline">_@Number</code>·to·the·level·of·your·Erlang·code,145 metavariables·such·as·<code·class="inline">_@Tuple</code>·and·<code·class="inline">_@Number</code>·to·the·level·of·your·Erlang·code,
146 so·you·can·use·the·corresponding·Erlang·variables·<code·class="inline">Tuple</code>·and·<code·class="inline">Number</code>·directly.146 so·you·can·use·the·corresponding·Erlang·variables·<code·class="inline">Tuple</code>·and·<code·class="inline">Number</code>·directly.
147 This·is·the·most·straightforward·way·to·use·Merl,·and·in·many·cases·it's·all·you147 This·is·the·most·straightforward·way·to·use·Merl,·and·in·many·cases·it's·all·you
148 need.</p><p>You·can·even·write·case·switches·using·<code·class="inline">?Q</code>·macros·as·patterns.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">AST</span><span·class="w">·</span><span·class="k">of</span><span·class="w">148 need.</p><p>You·can·even·write·case·switches·using·<code·class="inline">?Q</code>·macros·as·patterns.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">AST</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
149 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1748580457-1">(</span><span·class="s">&quot;{foo,·_@Foo}&quot;</span><span·class="p"·data-group-id="1748580457-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·92,·SHA:·2de818b56afe32fa45f56eef4781051012f6287528d1292ded57a6e5afb058f7·...·]-2">)</span><span·class="p">;</span><span·class="w">149 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9611315368-1">(</span><span·class="s">&quot;{foo,·_@Foo}&quot;</span><span·class="p"·data-group-id="9611315368-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·92,·SHA:·6c8c082cd36e18178dfdfeb891edf383e2a6e2ea5f6e8b50b5584bea0559542a·...·]-2">)</span><span·class="p">;</span><span·class="w">
150 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1748580457-3">(</span><span·class="s">&quot;{bar,·_@Bar}&quot;</span><span·class="p"·data-group-id="1748580457-3">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nc">erl_syntax</span><span·class="p">:</span><[·...·truncated·by·diffoscope;·len:·391,·SHA:·cc597c97261107ead101d256d4665d0a6415120b114fa82f7a13fc9cc236403d·...·]-5">)</span><span·class="p">;</span><span·class="w">150 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9611315368-3">(</span><span·class="s">&quot;{bar,·_@Bar}&quot;</span><span·class="p"·data-group-id="9611315368-3">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nc">erl_syntax</span><span·class="p">:</span><[·...·truncated·by·diffoscope;·len:·391,·SHA:·3add1160c4fd669cdac59d24a356a413ca9ec2ee12aabce50bcc1074ffa0a008·...·]-5">)</span><span·class="p">;</span><span·class="w">
151 ····</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle_default</span><span·class="p"·data-group-id="1748580457-6">(</span><span·class="p"·data-group-id="1748580457-6">)</span><span·class="w">151 ····</span><span·class="p">_</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">handle_default</span><span·class="p"·data-group-id="9611315368-6">(</span><span·class="p"·data-group-id="9611315368-6">)</span><span·class="w">
152 </span><span·class="k">end</span></code></pre><p>These·case·switches·only·allow·<code·class="inline">?Q(...)</code>·or·<code·class="inline">_</code>·as·clause·patterns,·and·the152 </span><span·class="k">end</span></code></pre><p>These·case·switches·only·allow·<code·class="inline">?Q(...)</code>·or·<code·class="inline">_</code>·as·clause·patterns,·and·the
153 guards·may·contain·any·expressions,·not·just·Erlang·guard·expressions.</p><p>If·the·macro·<code·class="inline">MERL_NO_TRANSFORM</code>·is·defined·before·the·<code·class="inline">merl.hrl</code>·header·file·is153 guards·may·contain·any·expressions,·not·just·Erlang·guard·expressions.</p><p>If·the·macro·<code·class="inline">MERL_NO_TRANSFORM</code>·is·defined·before·the·<code·class="inline">merl.hrl</code>·header·file·is
154 included,·the·parse·transform·used·by·Merl·will·be·disabled,·and·in·that·case,154 included,·the·parse·transform·used·by·Merl·will·be·disabled,·and·in·that·case,
155 the·match·expressions·<code·class="inline">?Q(...)·=·...</code>,·case·switches·using·<code·class="inline">?Q(...)</code>·patterns,155 the·match·expressions·<code·class="inline">?Q(...)·=·...</code>,·case·switches·using·<code·class="inline">?Q(...)</code>·patterns,
156 and·automatic·metavariables·like·<code·class="inline">_@Tuple</code>·cannot·be·used·in·your·code,·but·the156 and·automatic·metavariables·like·<code·class="inline">_@Tuple</code>·cannot·be·used·in·your·code,·but·the
157 Merl·macros·and·functions·still·work.·To·do·metavariable·substitution,·you·need157 Merl·macros·and·functions·still·work.·To·do·metavariable·substitution,·you·need
158 to·use·the·<code·class="inline">?Q(Text,·Map)</code>·macro.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tuple</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9246339205-1">(</span><span·class="s">&quot;{foo,·_@bar,·_@baz}&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9246339205-2">[</span><span·class="p"·data-group-id="9246339205-3">{</span><span·class="ss">bar</span[·...·truncated·by·diffoscope;·len:·453,·SHA:·9832e86fed2fc1f9691e9b12f43b46e6348f64ea3940322d40d41f9787d4ddbc·...·]-1">)</span></code></pre><p>The·text·given·to·a·<code·class="inline">?Q(Text)</code>·macro·can·be·either·a·single·string·or·a·list·of158 to·use·the·<code·class="inline">?Q(Text,·Map)</code>·macro.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Tuple</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="8050991509-1">(</span><span·class="s">&quot;{foo,·_@bar,·_@baz}&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8050991509-2">[</span><span·class="p"·data-group-id="8050991509-3">{</span><span·class="ss">bar</span[·...·truncated·by·diffoscope;·len:·453,·SHA:·1d282695cd38f2892c6c1efd412ab1a790d60b751fe74fda0ebea244284f75dd·...·]-1">)</span></code></pre><p>The·text·given·to·a·<code·class="inline">?Q(Text)</code>·macro·can·be·either·a·single·string·or·a·list·of
159 strings.·The·latter·is·useful·when·you·need·to·split·a·long·expression·over159 strings.·The·latter·is·useful·when·you·need·to·split·a·long·expression·over
160 multiple·lines.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="4959748568-1">(</span><span·class="p"·data-group-id="4959748568-2">[</span><span·class="s">&quot;case·_@Expr·of&quot;</span><span·class="p">,</span><span·class="w">160 multiple·lines.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9708068317-1">(</span><span·class="p"·data-group-id="9708068317-2">[</span><span·class="s">&quot;case·_@Expr·of&quot;</span><span·class="p">,</span><span·class="w">
161 ····</span><span·class="s">&quot;··{foo,·X}·-&gt;·f(X);&quot;</span><span·class="p">,</span><span·class="w">161 ····</span><span·class="s">&quot;··{foo,·X}·-&gt;·f(X);&quot;</span><span·class="p">,</span><span·class="w">
162 ····</span><span·class="s">&quot;··{bar,·X}·-&gt;·g(X)&quot;</span><span·class="p">,</span><span·class="w">162 ····</span><span·class="s">&quot;··{bar,·X}·-&gt;·g(X)&quot;</span><span·class="p">,</span><span·class="w">
163 ····</span><span·class="s">&quot;··_·-&gt;·h(X)&quot;</span><span·class="w">163 ····</span><span·class="s">&quot;··_·-&gt;·h(X)&quot;</span><span·class="w">
164 </span><span·class="s">&quot;end&quot;</span><span·class="p"·data-group-id="4959748568-2">]</span><span·class="p"·data-group-id="4959748568-1">)</span></code></pre><p>If·there·is·a·syntax·error·somewhere·in·the·text·(like·the·missing·semicolon·in164 </span><span·class="s">&quot;end&quot;</span><span·class="p"·data-group-id="9708068317-2">]</span><span·class="p"·data-group-id="9708068317-1">)</span></code></pre><p>If·there·is·a·syntax·error·somewhere·in·the·text·(like·the·missing·semicolon·in
165 the·second·clause·above)·this·allows·Merl·to·generate·an·error·message·pointing165 the·second·clause·above)·this·allows·Merl·to·generate·an·error·message·pointing
166 to·the·exact·line·in·your·source·code.·(Just·remember·to·comma-separate·the166 to·the·exact·line·in·your·source·code.·(Just·remember·to·comma-separate·the
167 strings·in·the·list,·otherwise·Erlang·will·concatenate·the·string·fragments·as167 strings·in·the·list,·otherwise·Erlang·will·concatenate·the·string·fragments·as
168 if·they·were·a·single·string.)</p><h3·id="module-metavariable-syntax"·class="section-heading">168 if·they·were·a·single·string.)</p><h3·id="module-metavariable-syntax"·class="section-heading">
169 ··<a·href="#module-metavariable-syntax"·class="hover-link">169 ··<a·href="#module-metavariable-syntax"·class="hover-link">
170 ····<i·class="ri-link-m"·aria-hidden="true"></i>170 ····<i·class="ri-link-m"·aria-hidden="true"></i>
171 ··</a>171 ··</a>
Offset 180, 73 lines modifiedOffset 180, 73 lines modified
180 note·that·globs·only·matter·for·matching;·when·doing·substitutions,·a·non-glob180 note·that·globs·only·matter·for·matching;·when·doing·substitutions,·a·non-glob
181 variable·can·be·used·to·inject·a·sequence·of·elements,·and·vice·versa.)</p><p>If·the·name·after·the·prefix·and·any·lift·and·glob·markers·is·<code·class="inline">_</code>·or·<code·class="inline">0</code>,·the181 variable·can·be·used·to·inject·a·sequence·of·elements,·and·vice·versa.)</p><p>If·the·name·after·the·prefix·and·any·lift·and·glob·markers·is·<code·class="inline">_</code>·or·<code·class="inline">0</code>,·the
182 variable·is·treated·as·an·anonymous·catch-all·pattern·in·matches.·For·example,182 variable·is·treated·as·an·anonymous·catch-all·pattern·in·matches.·For·example,
183 <code·class="inline">_@_</code>,·<code·class="inline">_@@_</code>,·<code·class="inline">_@__</code>,·or·even·<code·class="inline">_@__@_</code>.</p><p>Finally,·if·the·name·without·any·prefixes·or·lift/glob·markers·begins·with·an183 <code·class="inline">_@_</code>,·<code·class="inline">_@@_</code>,·<code·class="inline">_@__</code>,·or·even·<code·class="inline">_@__@_</code>.</p><p>Finally,·if·the·name·without·any·prefixes·or·lift/glob·markers·begins·with·an
184 uppercase·character,·as·in·<code·class="inline">_@Foo</code>·or·<code·class="inline">_@_@Foo</code>,·it·will·become·a·variable·on184 uppercase·character,·as·in·<code·class="inline">_@Foo</code>·or·<code·class="inline">_@_@Foo</code>,·it·will·become·a·variable·on
185 the·Erlang·level,·and·can·be·used·to·easily·deconstruct·and·construct·syntax185 the·Erlang·level,·and·can·be·used·to·easily·deconstruct·and·construct·syntax
186 trees:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">Input</span><span·class="w">·</span><span·class="k">of</span><span·class="w">186 trees:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">Input</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
187 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="4944402135-1">(</span><span·class="s">&quot;{foo,·_@Number}&quot;</span><span·class="p"·data-group-id="4944402135-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·c[·...·truncated·by·diffoscope;·len:·138,·SHA:·88ea6e2221bdcfb2c3c94a2ec2979cc8dd70f641b8489ffc3770c582b005a1b6·...·]5-2">)</span><span·class="p">;</span><span·class="w">187 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7299981285-1">(</span><span·class="s">&quot;{foo,·_@Number}&quot;</span><span·class="p"·data-group-id="7299981285-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·c[·...·truncated·by·diffoscope;·len:·138,·SHA:·8e38a9de96232faeb0ec0edd837b5b5cebec42edc27b8d4f612293df050182ca·...·]5-2">)</span><span·class="p">;</span><span·class="w">
188 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>We·refer·to·these·as·&quot;automatic·metavariables&quot;.·If·in·addition·the·name·ends188 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>We·refer·to·these·as·&quot;automatic·metavariables&quot;.·If·in·addition·the·name·ends
189 with·<code·class="inline">@</code>,·as·in·<code·class="inline">_@Foo@</code>,·the·value·of·the·variable·as·an·Erlang·term·will·be189 with·<code·class="inline">@</code>,·as·in·<code·class="inline">_@Foo@</code>,·the·value·of·the·variable·as·an·Erlang·term·will·be
190 automatically·converted·to·the·corresponding·abstract·syntax·tree·when·used·to190 automatically·converted·to·the·corresponding·abstract·syntax·tree·when·used·to
191 construct·a·larger·tree.·For·example,·in:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="3752633397-1">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="3752633397-1">}</span><span·class="p">,</span><span·class="w">191 construct·a·larger·tree.·For·example,·in:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Bar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="1984631601-1">{</span><span·class="ss">bar</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="1984631601-1">}</span><span·class="p">,</span><span·class="w">
192 </span><span·class="n">Foo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="3752633397-2">(</span><span·class="s">&quot;{foo,·_@Bar@}&quot;</span><span·class="p"·data-group-id="3752633397-2">)</span></code></pre><p>(where·Bar·is·just·some·term,·not·a·syntax·tree)·the·result·<code·class="inline">Foo</code>·will·be·a192 </span><span·class="n">Foo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1984631601-2">(</span><span·class="s">&quot;{foo,·_@Bar@}&quot;</span><span·class="p"·data-group-id="1984631601-2">)</span></code></pre><p>(where·Bar·is·just·some·term,·not·a·syntax·tree)·the·result·<code·class="inline">Foo</code>·will·be·a
193 syntax·tree·representing·<code·class="inline">{foo,·{bar,·42}}</code>.·This·avoids·the·need·for·temporary193 syntax·tree·representing·<code·class="inline">{foo,·{bar,·42}}</code>.·This·avoids·the·need·for·temporary
194 variables·in·order·to·inject·data,·as·in</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">TmpBar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_syntax</span><span·class="p">:</span><span·class="nf">abstract</span><span·class="p"·data-group-id="6941352126-1">(</span><span·class="n">Bar</span><span·class="p"·data-group-id="6941352126-1">)</span><span·class="p">,</span><span·class="w">194 variables·in·order·to·inject·data,·as·in</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">TmpBar</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_syntax</span><span·class="p">:</span><span·class="nf">abstract</span><span·class="p"·data-group-id="7023697012-1">(</span><span·class="n">Bar</span><span·class="p"·data-group-id="7023697012-1">)</span><span·class="p">,</span><span·class="w">
195 </span><span·class="n">Foo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="6941352126-2">(</span><span·class="s">&quot;{foo,·_@TmpBar}&quot;</span><span·class="p"·data-group-id="6941352126-2">)</span></code></pre><p>If·the·context·requires·an·integer·rather·than·a·variable,·an·atom,·or·a·string,195 </span><span·class="n">Foo</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7023697012-2">(</span><span·class="s">&quot;{foo,·_@TmpBar}&quot;</span><span·class="p"·data-group-id="7023697012-2">)</span></code></pre><p>If·the·context·requires·an·integer·rather·than·a·variable,·an·atom,·or·a·string,
196 you·cannot·use·the·uppercase·convention·to·mark·an·automatic·metavariable.196 you·cannot·use·the·uppercase·convention·to·mark·an·automatic·metavariable.
197 Instead,·if·the·integer·(without·the·<code·class="inline">909</code>-prefix·and·lift/glob·markers)·ends197 Instead,·if·the·integer·(without·the·<code·class="inline">909</code>-prefix·and·lift/glob·markers)·ends
198 in·a·<code·class="inline">9</code>,·the·integer·will·become·an·Erlang-level·variable·prefixed·with·<code·class="inline">Q</code>,198 in·a·<code·class="inline">9</code>,·the·integer·will·become·an·Erlang-level·variable·prefixed·with·<code·class="inline">Q</code>,
199 and·if·it·ends·with·<code·class="inline">99</code>·it·will·also·be·automatically·abstracted.·For·example,199 and·if·it·ends·with·<code·class="inline">99</code>·it·will·also·be·automatically·abstracted.·For·example,
200 the·following·will·increment·the·arity·of·the·exported·function·f:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">Form</span><span·class="w">·</span><span·class="k">of</span><span·class="w">200 the·following·will·increment·the·arity·of·the·exported·function·f:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="k">case</span><span·class="w">·</span><span·class="n">Form</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
201 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1672825717-1">(</span><span·class="s">&quot;-export([f/90919]).&quot;</span><span·class="p"·data-group-id="1672825717-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">201 ····</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="3217020505-1">(</span><span·class="s">&quot;-export([f/90919]).&quot;</span><span·class="p"·data-group-id="3217020505-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
202 ········</span><span·class="n">Q2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_syntax</span><span·class="p">:</span><span·class="nf">concrete</span><span·class="p"·data-group-id="1672825717-2">(</span><span·class="n">Q1</span><span·class="p"·data-group-id="1672825717-2">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">202 ········</span><span·class="n">Q2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">erl_syntax</span><span·class="p">:</span><span·class="nf">concrete</span><span·class="p"·data-group-id="3217020505-2">(</span><span·class="n">Q1</span><span·class="p"·data-group-id="3217020505-2">)</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
203 ········</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1672825717-3">(</span><span·class="s">&quot;-export([f/909299]).&quot;</span><span·class="p"·data-group-id="1672825717-3">)</span><span·class="p">;</span><span·class="w">203 ········</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="3217020505-3">(</span><span·class="s">&quot;-export([f/909299]).&quot;</span><span·class="p"·data-group-id="3217020505-3">)</span><span·class="p">;</span><span·class="w">
204 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h3·id="module-when-to-use-the-various-forms-of-metavariables"·class="section-heading">204 ····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h3·id="module-when-to-use-the-various-forms-of-metavariables"·class="section-heading">
205 ··<a·href="#module-when-to-use-the-various-forms-of-metavariables"·class="hover-link">205 ··<a·href="#module-when-to-use-the-various-forms-of-metavariables"·class="hover-link">
206 ····<i·class="ri-link-m"·aria-hidden="true"></i>206 ····<i·class="ri-link-m"·aria-hidden="true"></i>
207 ··</a>207 ··</a>
208 ··<span·class="text">When·to·use·the·various·forms·of·metavariables</span>208 ··<span·class="text">When·to·use·the·various·forms·of·metavariables</span>
209 </h3>209 </h3>
210 <p>Merl·can·only·parse·a·fragment·of·text·if·it·follows·the·basic·syntactical·rules210 <p>Merl·can·only·parse·a·fragment·of·text·if·it·follows·the·basic·syntactical·rules
211 of·Erlang.·In·most·places,·a·normal·Erlang·variable·can·be·used·as·metavariable,211 of·Erlang.·In·most·places,·a·normal·Erlang·variable·can·be·used·as·metavariable,
212 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1842533762-1">(</span><span·class="s">&quot;f(_@Arg)&quot;</span><span·class="p"·data-group-id="1842533762-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Expr</span></code></pre><p>but·if·you·want·to·match·on·something·like·the·name·of·a·function,·you·have·to212 for·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="6175091544-1">(</span><span·class="s">&quot;f(_@Arg)&quot;</span><span·class="p"·data-group-id="6175091544-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Expr</span></code></pre><p>but·if·you·want·to·match·on·something·like·the·name·of·a·function,·you·have·to
213 use·an·atom·as·metavariable:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="0237706044-1">(</span><span·class="s">&quot;&#39;@Name&#39;()·-&gt;·_@@_.&quot;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Function</span></code></pre><p>(note·the·anonymous·glob·variable·<code·class="inline">_@@_</code>·to·ignore·the·function·body).</p><p>In·some·contexts,·only·a·string·or·an·integer·is·allowed.·For·example,·the213 use·an·atom·as·metavariable:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="3599312871-1">(</span><span·class="s">&quot;&#39;@Name&#39;()·-&gt;·_@@_.&quot;</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Function</span></code></pre><p>(note·the·anonymous·glob·variable·<code·class="inline">_@@_</code>·to·ignore·the·function·body).</p><p>In·some·contexts,·only·a·string·or·an·integer·is·allowed.·For·example,·the
214 directive·<code·class="inline">-file(Name,·Line)</code>·requires·that·<code·class="inline">Name</code>·is·a·string·literal·and214 directive·<code·class="inline">-file(Name,·Line)</code>·requires·that·<code·class="inline">Name</code>·is·a·string·literal·and
215 <code·class="inline">Line</code>·an·integer·literal:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="5033729895-1">(</span><span·class="s">&quot;-file(\&quot;&#39;@File\&quot;,·9090).&quot;</span><span·class="p"·data-group-id="5033729895-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class=[·...·truncated·by·diffoscope;·len:·174,·SHA:·6badfa0c0ce32f6fe634dd751060e30e1f01b69b1d5b5c43e37002ab254ea09a·...·]-2">)</span><span·class="p">)</span><span·class="p">.</span></code></pre><p>This·will·extract·the·string·literal·<code·class="inline">&quot;foo.erl&quot;</code>·into·the·variable·<code·class="inline">Foo</code>.·Note215 <code·class="inline">Line</code>·an·integer·literal:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="3137898544-1">(</span><span·class="s">&quot;-file(\&quot;&#39;@File\&quot;,·9090).&quot;</span><span·class="p"·data-group-id="3137898544-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class=[·...·truncated·by·diffoscope;·len:·174,·SHA:·a45fee5a70070b2b55e59a65a0951645a07aa1233f3e72c98c96bc95b1144028·...·]-2">)</span><span·class="p">)</span><span·class="p">.</span></code></pre><p>This·will·extract·the·string·literal·<code·class="inline">&quot;foo.erl&quot;</code>·into·the·variable·<code·class="inline">Foo</code>.·Note
216 the·use·of·the·anonymous·variable·<code·class="inline">9090</code>·to·ignore·the·line·number.·To·match·and216 the·use·of·the·anonymous·variable·<code·class="inline">9090</code>·to·ignore·the·line·number.·To·match·and
217 also·bind·a·metavariable·that·must·be·an·integer·literal,·we·can·use·the217 also·bind·a·metavariable·that·must·be·an·integer·literal,·we·can·use·the
218 convention·of·ending·the·integer·with·a·9,·turning·it·into·a·Q-prefixed·variable218 convention·of·ending·the·integer·with·a·9,·turning·it·into·a·Q-prefixed·variable
219 on·the·Erlang·level·(see·the·previous·section).</p><h4>Globs</h4><p>Whenever·you·want·to·match·out·a·number·of·elements·in·a·sequence·(zero·or·more)219 on·the·Erlang·level·(see·the·previous·section).</p><h4>Globs</h4><p>Whenever·you·want·to·match·out·a·number·of·elements·in·a·sequence·(zero·or·more)
220 rather·than·a·fixed·set·of·elements,·you·need·to·use·a·glob.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9908988103-1">(</span><span·class="s">&quot;{_@@Elements}&quot;</span><span·class="p"·data-group-id="9908988103-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="[·...·truncated·by·diffoscope;·len:·357,·SHA:·21b1034028685a3bbc5e56956938f74a6b3ddb45e2e5c5864743428bacdc9de6·...·]3-2">)</span></code></pre><p>will·bind·Elements·to·the·list·of·individual·syntax·trees·representing·the·atoms220 rather·than·a·fixed·set·of·elements,·you·need·to·use·a·glob.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1572153893-1">(</span><span·class="s">&quot;{_@@Elements}&quot;</span><span·class="p"·data-group-id="1572153893-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="[·...·truncated·by·diffoscope;·len:·357,·SHA:·16404a6633cace85261075c8c0c729dd068cf57ce89f3618a88bd2914f40c631·...·]3-2">)</span></code></pre><p>will·bind·Elements·to·the·list·of·individual·syntax·trees·representing·the·atoms
221 <code·class="inline">a</code>,·<code·class="inline">b</code>,·and·<code·class="inline">c</code>.·This·can·also·be·used·with·static·prefix·and·suffix·elements221 <code·class="inline">a</code>,·<code·class="inline">b</code>,·and·<code·class="inline">c</code>.·This·can·also·be·used·with·static·prefix·and·suffix·elements
222 in·the·sequence.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="6384116038-1">(</span><span·class="s">&quot;{a,·b,·_@@Elements}&quot;</span><span·class="p"·data-group-id="6384116038-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="6384116038-2">(</span><span·class="p"·data-group-id="6384116038-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">d</span><span·class="p"·data-group-id="6384116038-3">}</span><span·class="p"·data-group-id="6384116038-2">)</span></code></pre><p>will·bind·Elements·to·the·list·of·the·<code·class="inline">c</code>·and·<code·class="inline">d</code>·subtrees,·and</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7178346360-1">(</span><span·class="s">&quot;{_@@Elements,·c,·d}&quot;</span><span·class="p"·data-group-id="7178346360-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7178346360-2">(</span><span·class="p"·data-group-id="7178346360-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">d</span><span·class="p"·data-group-id="7178346360-3">}</span><span·class="p"·data-group-id="7178346360-2">)</span></code></pre><p>will·bind·Elements·to·the·list·of·the·<code·class="inline">a</code>·and·<code·class="inline">b</code>·subtrees.·You·can·even·use 
223 plain·metavariables·in·the·prefix·or·suffix:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="7392423110-1">(</span><span·class="s">&quot;{_@First,·_@@Rest}&quot;</span><span·[·...·truncated·by·diffoscope;·len:·1421,·SHA:·37d483597c1f6272539940799324d229759ccc9c43f716b1690dcbc5ad45ef1e·...·]222 in·the·sequence.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="5025373003-1">(</span><span·class="s">&quot;{a,·b,·_@@Elements}&quot;</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·1720,·SHA:·9bd19b4123b634640f81db8ae43f15e77015c8dcb58773cc82f648791de57759·...·]
 223 plain·metavariables·in·the·prefix·or·suffix:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1942725934-1">(</span><span·class="s">&quot;{_@First,·_@@Rest}&quot;</span><span·class="p"·data-group-id="1942725934-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="1942725934-2">(</span><span·class="p"·data-group-id="1942725934-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p"·data-group-id="1942725934-3">}</span><span·class="p"·data-group-id="1942725934-2">)</span></code></pre><p>or</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="5469965986-1">(</span><span·class="s">&quot;{_@@_,·_@Last}&quot;</span><span·class="p"·data-group-id="5469965986-1">)</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="5469965986-2">(</span><span·class="p"·data-group-id="5469965986-3">{</span><span·class="ss">a</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">b</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">c</span><span·class="p"·data-group-id="5469965986-3">}</span><span·class="p"·data-group-id="5469965986-2">)</span></code></pre><p>(ignoring·all·but·the·last·element).·However,·you·cannot·have·two·globs·as·part
224 of·the·same·sequence.</p><h4>Lifted·metavariables</h4><p>In·some·cases,·the·Erlang·syntax·rules·make·it·impossible·to·place·a224 of·the·same·sequence.</p><h4>Lifted·metavariables</h4><p>In·some·cases,·the·Erlang·syntax·rules·make·it·impossible·to·place·a
225 metavariable·directly·where·you·would·like·it.·For·example,·you·cannot·write:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="0194141732-1">(</span><span·class="s">&quot;-export([_@@Name]).&quot;</span><span·class="p"·data-group-id="0194141732-1">)</span></code></pre><p>to·match·out·all·name/arity·pairs·in·the·export·list,·or·to·insert·a·list·of225 metavariable·directly·where·you·would·like·it.·For·example,·you·cannot·write:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9286206739-1">(</span><span·class="s">&quot;-export([_@@Name]).&quot;</span><span·class="p"·data-group-id="9286206739-1">)</span></code></pre><p>to·match·out·all·name/arity·pairs·in·the·export·list,·or·to·insert·a·list·of
226 exports·in·a·declaration,·because·the·Erlang·parser·only·allows·elements·on·the226 exports·in·a·declaration,·because·the·Erlang·parser·only·allows·elements·on·the
227 form·<code·class="inline">A/I</code>·(where·<code·class="inline">A</code>·is·an·atom·and·<code·class="inline">I</code>·an·integer)·in·the·export·list.·A227 form·<code·class="inline">A/I</code>·(where·<code·class="inline">A</code>·is·an·atom·and·<code·class="inline">I</code>·an·integer)·in·the·export·list.·A
228 variable·like·the·above·is·not·allowed,·but·neither·is·a·single·atom·or·integer,228 variable·like·the·above·is·not·allowed,·but·neither·is·a·single·atom·or·integer,
229 so·<code·class="inline">'@@Name'</code>·or·<code·class="inline">909919</code>·would·not·work·either.</p><p>What·you·have·to·do·in·such·cases·is·to·write·your·metavariable·in·a229 so·<code·class="inline">'@@Name'</code>·or·<code·class="inline">909919</code>·would·not·work·either.</p><p>What·you·have·to·do·in·such·cases·is·to·write·your·metavariable·in·a
230 syntactically·valid·position,·and·use·lifting·markers·to·denote·where·it·should230 syntactically·valid·position,·and·use·lifting·markers·to·denote·where·it·should
231 really·apply,·as·in:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9607502184-1">(</span><span·class="s">&quot;-export([&#39;@_@Name&#39;/0]).&quot;</span><span·class="p"·data-group-id="9607502184-1">)</span></code></pre><p>This·causes·the·variable·to·be·lifted·(after·parsing)·to·the·next·higher·level231 really·apply,·as·in:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="8875293134-1">(</span><span·class="s">&quot;-export([&#39;@_@Name&#39;/0]).&quot;</span><span·class="p"·data-group-id="8875293134-1">)</span></code></pre><p>This·causes·the·variable·to·be·lifted·(after·parsing)·to·the·next·higher·level
232 in·the·syntax·tree,·replacing·that·entire·subtree.·In·this·case,·the232 in·the·syntax·tree,·replacing·that·entire·subtree.·In·this·case,·the
233 <code·class="inline">'@_@Name'/0</code>·will·be·replaced·with·<code·class="inline">'@@Name'</code>,·and·the·<code·class="inline">/0</code>·part·was·just·used233 <code·class="inline">'@_@Name'/0</code>·will·be·replaced·with·<code·class="inline">'@@Name'</code>,·and·the·<code·class="inline">/0</code>·part·was·just·used
234 as·dummy·notation·and·will·be·discarded.</p><p>You·may·even·need·to·apply·lifting·more·than·once.·To·match·the·entire·export234 as·dummy·notation·and·will·be·discarded.</p><p>You·may·even·need·to·apply·lifting·more·than·once.·To·match·the·entire·export
235 list·as·a·single·syntax·tree,·you·can·write:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="9433877596-1">(</span><span·class="s">&quot;-export([&#39;@__Name&#39;/0]).&quot;</span><span·class="p"·data-group-id="9433877596-1">)</span></code></pre><p>using·two·underscores,·but·with·no·glob·marker·this·time.·This·will·make·the235 list·as·a·single·syntax·tree,·you·can·write:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">?</span><span·class="n">Q</span><span·class="p"·data-group-id="5748565544-1">(</span><span·class="s">&quot;-export([&#39;@__Name&#39;/0]).&quot;</span><span·class="p"·data-group-id="5748565544-1">)</span></code></pre><p>using·two·underscores,·but·with·no·glob·marker·this·time.·This·will·make·the
236 entire·<code·class="inline">['@__Name'/0]</code>·part·be·replaced·with·<code·class="inline">'@Name'</code>.</p><p>Sometimes,·the·tree·structure·of·a·code·fragment·is·not·very·obvious,·and·parts236 entire·<code·class="inline">['@__Name'/0]</code>·part·be·replaced·with·<code·class="inline">'@Name'</code>.</p><p>Sometimes,·the·tree·structure·of·a·code·fragment·is·not·very·obvious,·and·parts
237 of·the·structure·may·be·invisible·when·printed·as·source·code.·For·instance,·a237 of·the·structure·may·be·invisible·when·printed·as·source·code.·For·instance,·a
238 simple·function·definition·like·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">zero</span><span·class="p"·data-group-id="8190136973-1">(</span><span·class="p"·data-group-id="8190136973-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span></code></pre><p>consists·of·the·name·(the·atom·<code·class="inline">zero</code>),·and·a·list·of·clauses·containing·the238 simple·function·definition·like·the·following:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">zero</span><span·class="p"·data-group-id="1617810488-1">(</span><span·class="p"·data-group-id="1617810488-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">.</span></code></pre><p>consists·of·the·name·(the·atom·<code·class="inline">zero</code>),·and·a·list·of·clauses·containing·the
239 single·clause·<code·class="inline">()·-&gt;·0</code>.·The·clause·consists·of·an·argument·list·(empty),·a239 single·clause·<code·class="inline">()·-&gt;·0</code>.·The·clause·consists·of·an·argument·list·(empty),·a
240 guard·(empty),·and·a·body·(which·is·always·a·list·of·expressions)·containing·the240 guard·(empty),·and·a·body·(which·is·always·a·list·of·expressions)·containing·the
241 single·expression·<code·class="inline">0</code>.·This·means·that·to·match·out·the·name·and·the·list·of241 single·expression·<code·class="inline">0</code>.·This·means·that·to·match·out·the·name·and·the·list·of
242 clauses·of·any·function,·you'll·need·to·use·a·pattern·like242 clauses·of·any·function,·you'll·need·to·use·a·pattern·like
243 <code·class="inline">?Q(&quot;'@Name'()·-&gt;·_@_@Body.&quot;)</code>,·using·a·dummy·clause·whose·body·is·a·glob·lifted243 <code·class="inline">?Q(&quot;'@Name'()·-&gt;·_@_@Body.&quot;)</code>,·using·a·dummy·clause·whose·body·is·a·glob·lifted
244 one·level.</p><p>To·visualize·the·structure·of·a·syntax·tree,·you·can·use·the·function244 one·level.</p><p>To·visualize·the·structure·of·a·syntax·tree,·you·can·use·the·function
245 <code·class="inline">merl:show(T)</code>,·which·prints·a·summary.·For·example,·entering</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">merl</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="7368742047-1">(</span><span·class="nc">merl</span><span·class="p">:</span><span·class="nf">quote</span><span·class="p"·data-group-id="7368742047-2">(</span><span·class="s">&quot;inc(X,·Y)·when·Y·&gt;·0·-&gt;·X·+·Y.&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·6cdea507d750319fc810473d01f277a74fa04b1653bd1bf9c7c5b7d188f572fe·...·]-1">)</span></code></pre><p>in·the·Erlang·shell·will·print·the·following·(where·the·<code·class="inline">+</code>·signs·separate245 <code·class="inline">merl:show(T)</code>,·which·prints·a·summary.·For·example,·entering</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">merl</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="8228909141-1">(</span><span·class="nc">merl</span><span·class="p">:</span><span·class="nf">quote</span><span·class="p"·data-group-id="8228909141-2">(</span><span·class="s">&quot;inc(X,·Y)·when·Y·&gt;·0·-&gt;·X·+·Y.&quot;</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·65,·SHA:·8501a831050ab4cd38ecee2cd58ba073d580cb7755de278c1c6f21e2963bde8d·...·]-1">)</span></code></pre><p>in·the·Erlang·shell·will·print·the·following·(where·the·<code·class="inline">+</code>·signs·separate
246 groups·of·subtrees·on·the·same·level):</p><pre><code·class="text">function:·inc(X,·Y)·when·...·-&gt;·X·+·Y.246 groups·of·subtrees·on·the·same·level):</p><pre><code·class="text">function:·inc(X,·Y)·when·...·-&gt;·X·+·Y.
247 ··atom:·inc247 ··atom:·inc
248 ··+248 ··+
249 ··clause:·(X,·Y)·when·...·-&gt;·X·+·Y249 ··clause:·(X,·Y)·when·...·-&gt;·X·+·Y
250 ····variable:·X250 ····variable:·X
251 ····variable:·Y251 ····variable:·Y
252 ····+252 ····+
Offset 1698, 15 lines modifiedOffset 1698, 15 lines modified
1698 ······<p·class="built-using">1698 ······<p·class="built-using">
1699 ········Built·using1699 ········Built·using
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125 ··</h1>125 ··</h1>
  
126 <p>The·<a·href="tftp.html#start/1">start/1</a>·function·starts·a·daemon·process·listening·for·UDP126 <p>The·<a·href="tftp.html#start/1">start/1</a>·function·starts·a·daemon·process·listening·for·UDP
127 packets·on·a·port.·When·it·receives·a·request·for·read·or·write,·it·spawns·a127 packets·on·a·port.·When·it·receives·a·request·for·read·or·write,·it·spawns·a
128 temporary·server·process·handling·the·transfer.</p><p>This·is·a·simple·example·of·starting·the·TFTP·server·and·reading·the·content·of128 temporary·server·process·handling·the·transfer.</p><p>This·is·a·simple·example·of·starting·the·TFTP·server·and·reading·the·content·of
129 a·sample·file·using·the·TFTP·client.</p><p><em>Step·1.</em>·Create·a·sample·file·to·be·used·for·the·transfer:</p><pre><code·class="text">······$·echo·&quot;Erlang/OTP·21&quot;·&gt;·file.txt</code></pre><p><em>Step·2.</em>·Start·the·TFTP·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="6738018641-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="6738018641-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·483,·SHA:·f582e1ce9adfca092bf03dc1a666335f546e2db42d3e05f41c45950baeb1989f·...·]-2">)</span><span·class="p">.</span><span·class="w">129 a·sample·file·using·the·TFTP·client.</p><p><em>Step·1.</em>·Create·a·sample·file·to·be·used·for·the·transfer:</p><pre><code·class="text">······$·echo·&quot;Erlang/OTP·21&quot;·&gt;·file.txt</code></pre><p><em>Step·2.</em>·Start·the·TFTP·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">······</span><span·class="mi">1</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="0528033172-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pid</span><span·class="p"·data-group-id="0528033172-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·483,·SHA:·d1cc9643b6a5e3b177cfeafa32e9060cc0d0e1262d5416269cfd1d53913e7093·...·]-2">)</span><span·class="p">.</span><span·class="w">
130 ······</span><span·class="p"·data-group-id="6738018641-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.65</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="6738018641-5">}</span>[·...·truncated·by·diffoscope;·len:·896,·SHA:·314da99f876899086e2fcbe45c9acdfe3ac7aa15386f7b40cea74afdbcd865bc·...·]-1">)</span><span·class="p">.</span><span·class="w">130 ······</span><span·class="p"·data-group-id="0528033172-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.65</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0528033172-5">}</span>[·...·truncated·by·diffoscope;·len:·896,·SHA:·4b878da1608d1ac3441e974dd98ec6ed71e7d7365b5ccdf3d69524635a801b53·...·]-1">)</span><span·class="p">.</span><span·class="w">
131 ······</span><span·class="p"·data-group-id="4362569700-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4362569700-5">&lt;&lt;</span><span·class="s">&quot;Erlang/OTP·21\n&quot;</span><span·class="p"·data-group-id="4362569700-5">&gt;&gt;</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·1fbd0d3e73bd4c6dfc5d3138f67bfcd5f53e94fef46a8be246f0c1ba7ac0faa3·...·]-4">}</span></code></pre>131 ······</span><span·class="p"·data-group-id="2886668004-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2886668004-5">&lt;&lt;</span><span·class="s">&quot;Erlang/OTP·21\n&quot;</span><span·class="p"·data-group-id="2886668004-5">&gt;&gt;</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·97919e8cb0f3d555b27caae99f7179ce4f86f09e2f3ee5a1420750c40279fb2c·...·]-4">}</span></code></pre>
132 </div>132 </div>
  
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130 ····<section·id="moduledoc">130 ····<section·id="moduledoc">
131 <p>Trivial·FTP.</p><p>Interface·module·for·the·<code·class="inline">tftp</code>·application.</p><h2·id="module-overwiew"·class="section-heading">131 <p>Trivial·FTP.</p><p>Interface·module·for·the·<code·class="inline">tftp</code>·application.</p><h2·id="module-overwiew"·class="section-heading">
132 ··<a·href="#module-overwiew"·class="hover-link">132 ··<a·href="#module-overwiew"·class="hover-link">
133 ····<i·class="ri-link-m"·aria-hidden="true"></i>133 ····<i·class="ri-link-m"·aria-hidden="true"></i>
134 ··</a>134 ··</a>
135 ··<span·class="text">Overwiew</span>135 ··<span·class="text">Overwiew</span>
136 </h2>136 </h2>
137 <p>This·is·a·complete·implementation·of·the·following·IETF·standards:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">1350</span><span·class="p">,</span><span·class="w">·</span><span·class="n">The</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Protocol</span><span·class="w">·</span><span·class="p"·data-group-id="6906135104-1">(</span><span·class="ss">revision</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="6906135104-1">)</span><span·class="p">.</span><span·class="w">137 <p>This·is·a·complete·implementation·of·the·following·IETF·standards:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">1350</span><span·class="p">,</span><span·class="w">·</span><span·class="n">The</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Protocol</span><span·class="w">·</span><span·class="p"·data-group-id="7556460390-1">(</span><span·class="ss">revision</span><span·class="w">·</span><span·class="mi">2</span><span·class="p"·data-group-id="7556460390-1">)</span><span·class="p">.</span><span·class="w">
138 </span><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">2347</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Option</span><span·class="w">·</span><span·class="n">Extension</span><span·class="p">.</span><span·class="w">138 </span><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">2347</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Option</span><span·class="w">·</span><span·class="n">Extension</span><span·class="p">.</span><span·class="w">
139 </span><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">2348</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Blocksize</span><span·class="w">·</span><span·class="n">Option</span><span·class="p">.</span><span·class="w">139 </span><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">2348</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Blocksize</span><span·class="w">·</span><span·class="n">Option</span><span·class="p">.</span><span·class="w">
140 </span><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">2349</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="w">·</span><span·class="n">Interval</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">Transfer</span><span·class="w">·</span><span·class="n">Size</span><span·class="w">·</span><span·class="n">Options</span><span·class="p">.</span></code></pre><p>The·only·feature·that·not·is·implemented·in·this·release·is140 </span><span·class="n">RFC</span><span·class="w">·</span><span·class="mi">2349</span><span·class="p">,</span><span·class="w">·</span><span·class="n">TFTP</span><span·class="w">·</span><span·class="n">Timeout</span><span·class="w">·</span><span·class="n">Interval</span><span·class="w">·</span><span·class="ow">and</span><span·class="w">·</span><span·class="n">Transfer</span><span·class="w">·</span><span·class="n">Size</span><span·class="w">·</span><span·class="n">Options</span><span·class="p">.</span></code></pre><p>The·only·feature·that·not·is·implemented·in·this·release·is
141 the·&quot;netascii&quot;·transfer·mode.</p><p>The·<a·href="#start/1">start</a>·function·starts·a·daemon·process·which,·listens141 the·&quot;netascii&quot;·transfer·mode.</p><p>The·<a·href="#start/1">start</a>·function·starts·a·daemon·process·which,·listens
142 for·UDP·packets·on·a·port.·When·it·receives·a·request·for·read·or142 for·UDP·packets·on·a·port.·When·it·receives·a·request·for·read·or
143 write·it·spawns·a·temporary·server·process·which·handles·the·actual143 write·it·spawns·a·temporary·server·process·which·handles·the·actual
144 transfer·of·the·file.·On·the·client·side·the144 transfer·of·the·file.·On·the·client·side·the
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935 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>935 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
936 ····</footer>936 ····</footer>
937 ··</div>937 ··</div>
938 </main>938 </main>
939 </div>939 </div>
940 <script>940 <script>
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304 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>304 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
305 ······</p>305 ······</p>
306 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>306 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
307 ····</footer>307 ····</footer>
308 ··</div>308 ··</div>
309 </main>309 </main>
310 </div>310 </div>
311 <script>311 <script>
312 ··function·mermaidLoaded()·{312 ··function·mermaidLoaded()·{
313 ····mermaid.initialize({313 ····mermaid.initialize({
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144 ········Built·using144 ········Built·using
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146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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259 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>259 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
260 ······</p>260 ······</p>
261 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>261 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
262 ····</footer>262 ····</footer>
263 ··</div>263 ··</div>
264 </main>264 </main>
265 </div>265 </div>
266 <script>266 <script>
267 ··function·mermaidLoaded()·{267 ··function·mermaidLoaded()·{
268 ····mermaid.initialize({268 ····mermaid.initialize({
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1507 ······</div>1507 ······</div>
  
1508 <p>Analyzes·one·or·more·modules·as·specified·by·<code·class="inline">Arg</code>.</p><p>If·<code·class="inline">Arg</code>·is·one·of·the·values·in·<a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>,·this1508 <p>Analyzes·one·or·more·modules·as·specified·by·<code·class="inline">Arg</code>.</p><p>If·<code·class="inline">Arg</code>·is·one·of·the·values·in·<a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>,·this
1509 call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse('_',·Arg,·function)</code></a>.</p><p>If·<code·class="inline">Arg</code>·is·one·of·the·values·in·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·this1509 call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse('_',·Arg,·function)</code></a>.</p><p>If·<code·class="inline">Arg</code>·is·one·of·the·values·in·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·this
1510 call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse('_',·coverage,·Arg)</code></a>.</p><p>Otherwise·<code·class="inline">Arg</code>·is·assumed·to·be·a·module·name,·and·this·call·is·equivalent1510 call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse('_',·coverage,·Arg)</code></a>.</p><p>Otherwise·<code·class="inline">Arg</code>·is·assumed·to·be·a·module·name,·and·this·call·is·equivalent
1511 to·<a·href="#analyse/3"><code·class="inline">analyse(Arg,·coverage,·function)</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>To·analyze·a·module·whose·name·overlaps·with·one·the·values·in1511 to·<a·href="#analyse/3"><code·class="inline">analyse(Arg,·coverage,·function)</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>To·analyze·a·module·whose·name·overlaps·with·one·the·values·in
1512 <a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>·or·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·the·module1512 <a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>·or·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·the·module
1513 name·has·to·be·in·a·list.·For·example,·to·analyze·a·module·named·<code·class="inline">calls</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="0872439714-1">(</span><span·class="p"·data-group-id="0872439714-2">[</span><span·class="ss">calls</span><span·class="p"·data-group-id="0872439714-2">]</span><span·class="p"·data-group-id="0872439714-1">)</span><span·class="p">.</span></code></pre></section>1513 name·has·to·be·in·a·list.·For·example,·to·analyze·a·module·named·<code·class="inline">calls</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="1565745174-1">(</span><span·class="p"·data-group-id="1565745174-2">[</span><span·class="ss">calls</span><span·class="p"·data-group-id="1565745174-2">]</span><span·class="p"·data-group-id="1565745174-1">)</span><span·class="p">.</span></code></pre></section>
1514 ··</section>1514 ··</section>
1515 </section>1515 </section>
1516 <section·class="detail"·id="analyse/2">1516 <section·class="detail"·id="analyse/2">
  
1517 ··<div·class="detail-header">1517 ··<div·class="detail-header">
1518 ····<a·href="#analyse/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1518 ····<a·href="#analyse/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1519 ······<i·class="ri-link-m"·aria-hidden="true"></i>1519 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1547 <p>Analyzes·one·or·more·modules·as·specified·by·<code·class="inline">Arg1</code>·and·<code·class="inline">Arg2</code>.</p><p>If·<code·class="inline">Arg1</code>·is·one·of·the·values·in·<a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>·and1547 <p>Analyzes·one·or·more·modules·as·specified·by·<code·class="inline">Arg1</code>·and·<code·class="inline">Arg2</code>.</p><p>If·<code·class="inline">Arg1</code>·is·one·of·the·values·in·<a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>·and
1548 <code·class="inline">Arg2</code>·is·one·of·the·values·in·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·this1548 <code·class="inline">Arg2</code>·is·one·of·the·values·in·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·this
1549 call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse('_',·Arg1,·Arg2)</code></a>.</p><p>If·<code·class="inline">Arg2</code>·is·one·of·the·values·in·<a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>,1549 call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse('_',·Arg1,·Arg2)</code></a>.</p><p>If·<code·class="inline">Arg2</code>·is·one·of·the·values·in·<a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>,
1550 <code·class="inline">Arg1</code>·is·assumed·to·be·a·module·and·this·call·is·equivalent·to1550 <code·class="inline">Arg1</code>·is·assumed·to·be·a·module·and·this·call·is·equivalent·to
1551 <a·href="#analyse/3"><code·class="inline">analyse(Arg1,·Arg2,·function)</code></a>.</p><p>If·<code·class="inline">Arg2</code>·is·one·of·the·values·in·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·<code·class="inline">Arg1</code>·is1551 <a·href="#analyse/3"><code·class="inline">analyse(Arg1,·Arg2,·function)</code></a>.</p><p>If·<code·class="inline">Arg2</code>·is·one·of·the·values·in·<a·href="#t:level/0"><code·class="inline">level()</code></a>,·<code·class="inline">Arg1</code>·is
1552 assumed·to·be·a·module·and·this·call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse(Arg1,·coverage,·Arg2)</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>To·analyze·a·module·whose·name·overlaps·with·one·of·the·values·in1552 assumed·to·be·a·module·and·this·call·is·equivalent·to·<a·href="#analyse/3"><code·class="inline">analyse(Arg1,·coverage,·Arg2)</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>To·analyze·a·module·whose·name·overlaps·with·one·of·the·values·in
1553 <a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>,·the·module·name·needs·to·be·in·a1553 <a·href="#t:analysis/0"><code·class="inline">analysis()</code></a>,·the·module·name·needs·to·be·in·a
1554 list.·For·example,·to·analyze·a·module·named·<code·class="inline">calls</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="1988672719-1">(</span><span·class="p"·data-group-id="1988672719-2">[</span><span·class="ss">calls</span><span·class="p"·data-group-id="1988672719-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">function</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·4189058fe33c24b632e8673c645e871e261ca05f380e79acfb582daabb490b96·...·]-1">)</span><span·class="p">.</span></code></pre></section>1554 list.·For·example,·to·analyze·a·module·named·<code·class="inline">calls</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="3542796143-1">(</span><span·class="p"·data-group-id="3542796143-2">[</span><span·class="ss">calls</span><span·class="p"·data-group-id="3542796143-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">function</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·22,·SHA:·6479df1d72ccfae9a451e5a9da837dc3f08266ec29f8ca8f0d727465f6c593a9·...·]-1">)</span><span·class="p">.</span></code></pre></section>
1555 ··</section>1555 ··</section>
1556 </section>1556 </section>
1557 <section·class="detail"·id="analyse/3">1557 <section·class="detail"·id="analyse/3">
  
1558 ··<div·class="detail-header">1558 ··<div·class="detail-header">
1559 ····<a·href="#analyse/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1559 ····<a·href="#analyse/3"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1560 ······<i·class="ri-link-m"·aria-hidden="true"></i>1560 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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1650 ······</div>1650 ······</div>
  
1651 <p>If·<code·class="inline">Arg</code>·is·a·list·of·<a·href="#t:analyse_option/0"><code·class="inline">analyse_option()</code></a>1651 <p>If·<code·class="inline">Arg</code>·is·a·list·of·<a·href="#t:analyse_option/0"><code·class="inline">analyse_option()</code></a>
1652 options,·this·call·is·equivalent·to·<a·href="#analyse_to_file/2"><code·class="inline">analyse_to_file('_',·Arg)</code></a>.</p><p>Otherwise·<code·class="inline">Arg</code>·is·assumed·to·be·a·module,·and·this·call·is·equivalent·to1652 options,·this·call·is·equivalent·to·<a·href="#analyse_to_file/2"><code·class="inline">analyse_to_file('_',·Arg)</code></a>.</p><p>Otherwise·<code·class="inline">Arg</code>·is·assumed·to·be·a·module,·and·this·call·is·equivalent·to
1653 <a·href="#analyse_to_file/2"><code·class="inline">analyse_to_file(Arg,·[])</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>To·analyze·a·module·of·the·name·<code·class="inline">html</code>·(which·overlaps·with·an·option1653 <a·href="#analyse_to_file/2"><code·class="inline">analyse_to_file(Arg,·[])</code></a>.</p><section·role="note"·class="admonition·info"><h4·class="admonition-title·info">Note</h4><p>To·analyze·a·module·of·the·name·<code·class="inline">html</code>·(which·overlaps·with·an·option
1654 in·<a·href="#t:analyse_option/0"><code·class="inline">analyse_option()</code></a>),·it·is·necessary·to1654 in·<a·href="#t:analyse_option/0"><code·class="inline">analyse_option()</code></a>),·it·is·necessary·to
1655 use·<a·href="#analyse_to_file/2"><code·class="inline">cover:analyse_to_file/2</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse_to_file</span><span·class="p"·data-group-id="2965136331-1">(</span><span·class="p"·data-group-id="2965136331-2">[</span><span·class="ss">html</span><span·class="p"·data-group-id="2965136331-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2965136331-3">[</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·16a0becbbd29e31ec187c2282941bb601a224d168b30b900fd1e802c0d6d2a4d·...·]-1">)</span><span·class="p">.</span></code></pre></section>1655 use·<a·href="#analyse_to_file/2"><code·class="inline">cover:analyse_to_file/2</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse_to_file</span><span·class="p"·data-group-id="9546787217-1">(</span><span·class="p"·data-group-id="9546787217-2">[</span><span·class="ss">html</span><span·class="p"·data-group-id="9546787217-2">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9546787217-3">[</span[·...·truncated·by·diffoscope;·len:·95,·SHA:·962db99f95ed3e45c440389c7fdbd0399cb8f68f1c88ddfd321f185c520243b3·...·]-1">)</span><span·class="p">.</span></code></pre></section>
1656 ··</section>1656 ··</section>
1657 </section>1657 </section>
1658 <section·class="detail"·id="analyse_to_file/2">1658 <section·class="detail"·id="analyse_to_file/2">
  
1659 ··<div·class="detail-header">1659 ··<div·class="detail-header">
1660 ····<a·href="#analyse_to_file/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">1660 ····<a·href="#analyse_to_file/2"·class="detail-link"·data-no-tooltip·aria-label="Link·to·this·function">
1661 ······<i·class="ri-link-m"·aria-hidden="true"></i>1661 ······<i·class="ri-link-m"·aria-hidden="true"></i>
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2583 ······<p·class="built-using">2583 ······<p·class="built-using">
2584 ········Built·using2584 ········Built·using
2585 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the2585 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
2586 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>2586 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
2587 ······</p>2587 ······</p>
2588 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2588 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2589 ····</footer>2589 ····</footer>
2590 ··</div>2590 ··</div>
2591 </main>2591 </main>
2592 </div>2592 </div>
2593 <script>2593 <script>
2594 ··function·mermaidLoaded()·{2594 ··function·mermaidLoaded()·{
2595 ····mermaid.initialize({2595 ····mermaid.initialize({
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142 </h2>142 </h2>
143 <h3·id="example"·class="section-heading">143 <h3·id="example"·class="section-heading">
144 ··<a·href="#example"·class="hover-link">144 ··<a·href="#example"·class="hover-link">
145 ····<i·class="ri-link-m"·aria-hidden="true"></i>145 ····<i·class="ri-link-m"·aria-hidden="true"></i>
146 ··</a>146 ··</a>
147 ··<span·class="text">Example</span>147 ··<span·class="text">Example</span>
148 </h3>148 </h3>
149 <p>Assume·that·a·test·case·for·the·following·program·should·be·verified:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3527422193-1">(</span><span·class="ss">channel</span><span·class="p"·data-group-id="3527422193-1">)</span><span·class="p">.</span><span·class="w">149 <p>Assume·that·a·test·case·for·the·following·program·should·be·verified:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1070134050-1">(</span><span·class="ss">channel</span><span·class="p"·data-group-id="1070134050-1">)</span><span·class="p">.</span><span·class="w">
150 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="3527422193-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="3527422193-2">)</span><span·class="p">.</span><span·class="w">150 </span><span·class="p">-</span><span·class="na">behaviour</span><span·class="p"·data-group-id="1070134050-2">(</span><span·class="ss">gen_server</span><span·class="p"·data-group-id="1070134050-2">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="w">151 </span><span·class="w">
152 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3527422193-3">(</span><span·class="p"·data-group-id="3527422193-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">stop</span><span·class="p">/</span><span·class="mi">0</sp[·...·truncated·by·diffoscope;·len:·97,·SHA:·7087a09b8237a369eabcd90ff240cb04f21e3d9dbf91107e8ae56eb4d37ad310·...·]-3">)</span><span·class="p">.</span><span·class="w">152 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1070134050-3">(</span><span·class="p"·data-group-id="1070134050-4">[</span><span·class="ss">start_link</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">stop</span><span·class="p">/</span><span·class="mi">0</sp[·...·truncated·by·diffoscope;·len:·97,·SHA:·f281ba7bee8caf59c49c19fccdc136f25b610ffe026ae6541b5793804b50aa2c·...·]-3">)</span><span·class="p">.</span><span·class="w">
153 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3527422193-5">(</span><span·class="p"·data-group-id="3527422193-6">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">/</span><span·class="mi">1</span><s[·...·truncated·by·diffoscope;·len:·92,·SHA:·4cc469c7f6919779a327700b61b08eec8c35e75b5ef4a544fce8575fdda3159e·...·]-5">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·client·interface</span><span·class="w">153 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1070134050-5">(</span><span·class="p"·data-group-id="1070134050-6">[</span><span·class="ss">alloc</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">/</span><span·class="mi">1</span><s[·...·truncated·by·diffoscope;·len:·92,·SHA:·1640343e9c36aa65b8cd6984b37b2f1d54731cd36de933edc3edfeb95bc8c283·...·]-5">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·client·interface</span><span·class="w">
154 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3527422193-7">(</span><span·class="p"·data-group-id="3527422193-8">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">/</span><span·class="mi">3</s[·...·truncated·by·diffoscope;·len:·204,·SHA:·c53fa332997c7686d4fc1e0e675f76f31137c1d62ab3b3d4a31458081b9e902a·...·]-7">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·callback·functions</span><span·class="w">154 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1070134050-7">(</span><span·class="p"·data-group-id="1070134050-8">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">/</span><span·class="mi">3</s[·...·truncated·by·diffoscope;·len:·204,·SHA:·06a3e0889b3d9b0b0e9a5132f8208007713845aef71298106efa1b78243defcd·...·]-7">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·callback·functions</span><span·class="w">
  
155 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="3527422193-9">(</span><span·class="p"·data-group-id="3527422193-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">155 </span><span·class="nf">start_link</span><span·class="p"·data-group-id="1070134050-9">(</span><span·class="p"·data-group-id="1070134050-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
156 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="3527422193-10">(</span><span·class="p"·data-group-id="3527422193-11">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">channel</span><span·class="p"·data-group-id="3527422193-11">}</span><span·class="p">,</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·391,·SHA:·2739437493a0ad067fc43f307e682ce6625c56f092b4fd906f9fa9a4e565d1ca·...·]-10">)</span><span·class="p">.</span><span·class="w">156 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="1070134050-10">(</span><span·class="p"·data-group-id="1070134050-11">{</span><span·class="ss">local</span><span·class="p">,</span><span·class="ss">channel</span><span·class="p"·data-group-id="1070134050-11">}</span><span·class="p">,</span><span·class="w">·[·...·truncated·by·diffoscope;·len:·391,·SHA:·dd049e67c5f5c932090ab40737d6990379d7db0d1d9b88e2ff8c3755f719dfbd·...·]-10">)</span><span·class="p">.</span><span·class="w">
  
157 </span><span·class="nf">stop</span><span·class="p"·data-group-id="3527422193-14">(</span><span·class="p"·data-group-id="3527422193-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 </span><span·class="nf">stop</span><span·class="p"·data-group-id="1070134050-14">(</span><span·class="p"·data-group-id="1070134050-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3527422193-15">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="3527422193-15">)</span><span·class="p">.</span><span·class="w">158 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="1070134050-15">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">stop</span><span·class="p"·data-group-id="1070134050-15">)</span><span·class="p">.</span><span·class="w">
  
159 </span><span·class="c1">%%%-Client·interface·functions-------------------------------------------</span><span·class="w">159 </span><span·class="c1">%%%-Client·interface·functions-------------------------------------------</span><span·class="w">
  
160 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="3527422193-16">(</span><span·class="p"·data-group-id="3527422193-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">160 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="1070134050-16">(</span><span·class="p"·data-group-id="1070134050-16">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
161 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3527422193-17">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="3527422193-17">)</span><span·class="p">.</span><span·class="w">161 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="1070134050-17">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">alloc</span><span·class="p"·data-group-id="1070134050-17">)</span><span·class="p">.</span><span·class="w">
  
162 </span><span·class="nf">free</span><span·class="p"·data-group-id="3527422193-18">(</span><span·class="n">Channel</span><span·class="p"·data-group-id="3527422193-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">162 </span><span·class="nf">free</span><span·class="p"·data-group-id="1070134050-18">(</span><span·class="n">Channel</span><span·class="p"·data-group-id="1070134050-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
163 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3527422193-19">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3527422193-20">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="n">Channel</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·77,·SHA:·ffe9b593e532290d84916998987cf35f76fdc2c8ef27a66bf658c4ef90fc4fb1·...·]-19">)</span><span·class="p">.</span><span·class="w">163 ····</span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="1070134050-19">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1070134050-20">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="n">Channel</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·77,·SHA:·c0a8891f53a9738c0a008162278dcaec9a431d7b00f2bace93f091ee132c28bf·...·]-19">)</span><span·class="p">.</span><span·class="w">
  
164 </span><span·class="c1">%%%-gen_server·callback·functions----------------------------------------</span><span·class="w">164 </span><span·class="c1">%%%-gen_server·callback·functions----------------------------------------</span><span·class="w">
  
165 </span><span·class="nf">init</span><span·class="p"·data-group-id="3527422193-21">(</span><span·class="p">_</span><span·class="n">Arg</span><span·class="p"·data-group-id="3527422193-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">165 </span><span·class="nf">init</span><span·class="p"·data-group-id="1070134050-21">(</span><span·class="p">_</span><span·class="n">Arg</span><span·class="p"·data-group-id="1070134050-21">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
166 ····</span><span·class="p"·data-group-id="3527422193-22">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="nf">channels</span><span·class="p"·data-group-id="3527422193-23">(</span><span·class="p"·data-group-id="3527422193-23">)</span><span·class="p"·data-group-id="3527422193-22">}</span><span·class="p">.</span><span·class="w">166 ····</span><span·class="p"·data-group-id="1070134050-22">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="nf">channels</span><span·class="p"·data-group-id="1070134050-23">(</span><span·class="p"·data-group-id="1070134050-23">)</span><span·class="p"·data-group-id="1070134050-22">}</span><span·class="p">.</span><span·class="w">
  
167 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3527422193-24">(</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Client</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·b764b355a36ae93739302208c049def00049e56f6776f21d1de0af398ff31415·...·]-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="1070134050-24">(</span><span·class="ss">stop</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Client</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·b7299d32889d0209cf4de89156bfadfc7441d5a437acd9aa30ce993f5f3d66f5·...·]-24">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 ····</span><span·class="p"·data-group-id="3527422193-25">{</span><span·class="ss">stop</span><span·class="p">,</span><span·class="ss">normal</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-25">}</span><span·class="p">;</span><span·class="w">168 ····</span><span·class="p"·data-group-id="1070134050-25">{</span><span·class="ss">stop</span><span·class="p">,</span><span·class="ss">normal</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-25">}</span><span·class="p">;</span><span·class="w">
  
169 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3527422193-26">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Client</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·299c150a70d9d6b0e7eb4e881242f5cdcbd11c6de37f8d6ecc2bf923753c4848·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">169 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="1070134050-26">(</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Client</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·17,·SHA:·edf1ea87fb6bbea1214e9d933da198c09094f5af2c4100a3921233310798e413·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
170 ····</span><span·class="p"·data-group-id="3527422193-27">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="n">Channels2</span><span·class="p"·data-group-id="3527422193-27">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">alloc</sp[·...·truncated·by·diffoscope;·len:·129,·SHA:·c13546cb1886f5d49fd918c6da8b5dfafe0512f574f1f10d427b217b60cdd8a4·...·]-28">)</span><span·class="p">,</span><span·class="w">170 ····</span><span·class="p"·data-group-id="1070134050-27">{</span><span·class="n">Ch</span><span·class="p">,</span><span·class="n">Channels2</span><span·class="p"·data-group-id="1070134050-27">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">alloc</sp[·...·truncated·by·diffoscope;·len:·129,·SHA:·622f4fe778537b2a71ce8a2fdd4aa6da3882f5b254e979619e3236074b2078e5·...·]-28">)</span><span·class="p">,</span><span·class="w">
171 ····</span><span·class="p"·data-group-id="3527422193-29">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="p"·data-group-id="3527422193-30">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Ch</span><span·class="p"·data-group-id="3527422193-30">}</sp[·...·truncated·by·diffoscope;·len:·100,·SHA:·cbeab82efa9d9cccf64cd80885690c930bf73076eb549c73da3db3af9ade80cd·...·]-29">}</span><span·class="p">;</span><span·class="w">171 ····</span><span·class="p"·data-group-id="1070134050-29">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="p"·data-group-id="1070134050-30">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Ch</span><span·class="p"·data-group-id="1070134050-30">}</sp[·...·truncated·by·diffoscope;·len:·100,·SHA:·dece801e561bec26428ee91ac0d740d7de56980971e9a931fb26d55a4d2a1a53·...·]-29">}</span><span·class="p">;</span><span·class="w">
  
172 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3527422193-31">(</span><span·class="p"·data-group-id="3527422193-32">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="n">Channel</span><span·class="p"·data-group-id="3527422193-32">}</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·178,·SHA:·a1ce5c2f6df17c1e541573b8cf6dab118b7c88200db4573eed51dc17e2f0b13d·...·]-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">172 </span><span·class="nf">handle_call</span><span·class="p"·data-group-id="1070134050-31">(</span><span·class="p"·data-group-id="1070134050-32">{</span><span·class="ss">free</span><span·class="p">,</span><span·class="n">Channel</span><span·class="p"·data-group-id="1070134050-32">}</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·178,·SHA:·fcf4d020cffd66c4ca35e6ebca962625d22714266e7e9af5786a1004951c50d0·...·]-31">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
173 ····</span><span·class="n">Channels2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="3527422193-33">(</span><span·class="n">Channel</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-33">)</span><span·class="p">,</span><span·class="w">173 ····</span><span·class="n">Channels2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">free</span><span·class="p"·data-group-id="1070134050-33">(</span><span·class="n">Channel</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-33">)</span><span·class="p">,</span><span·class="w">
174 ····</span><span·class="p"·data-group-id="3527422193-34">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Channels2</span><span·class="p"·data-group-id="3527422193-34">}</span><span·class="p">.</span><span·class="w">174 ····</span><span·class="p"·data-group-id="1070134050-34">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Channels2</span><span·class="p"·data-group-id="1070134050-34">}</span><span·class="p">.</span><span·class="w">
  
175 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="3527422193-35">(</span><span·class="p">_</span><span·class="n">Reason</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 </span><span·class="nf">terminate</span><span·class="p"·data-group-id="1070134050-35">(</span><span·class="p">_</span><span·class="n">Reason</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-35">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">176 ····</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
  
177 </span><span·class="c1">%%%-Internal·functions---------------------------------------------------</span><span·class="w">177 </span><span·class="c1">%%%-Internal·functions---------------------------------------------------</span><span·class="w">
  
178 </span><span·class="nf">channels</span><span·class="p"·data-group-id="3527422193-36">(</span><span·class="p"·data-group-id="3527422193-36">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 </span><span·class="nf">channels</span><span·class="p"·data-group-id="1070134050-36">(</span><span·class="p"·data-group-id="1070134050-36">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ····</span><span·class="p"·data-group-id="3527422193-37">[</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="ss">ch2</span><span·class="p">,</span><span·class="ss">ch3</span><span·class="p"·data-group-id="3527422193-37">]</span><span·class="p">.</span><span·class="w">179 ····</span><span·class="p"·data-group-id="1070134050-37">[</span><span·class="ss">ch1</span><span·class="p">,</span><span·class="ss">ch2</span><span·class="p">,</span><span·class="ss">ch3</span><span·class="p"·data-group-id="1070134050-37">]</span><span·class="p">.</span><span·class="w">
  
180 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="3527422193-38">(</span><span·class="p"·data-group-id="3527422193-39">[</span><span·class="n">Channel</span><span·class="p">|</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-39">]</span><span·class="p"·data-group-id="352742219[·...·truncated·by·diffoscope;·len:·1,·SHA:·4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce·...·]-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="1070134050-38">(</span><span·class="p"·data-group-id="1070134050-39">[</span><span·class="n">Channel</span><span·class="p">|</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-39">]</span><span·class="p"·data-group-id="107013405[·...·truncated·by·diffoscope;·len:·1,·SHA:·5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9·...·]-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ····</span><span·class="p"·data-group-id="3527422193-40">{</span><span·class="n">Channel</span><span·class="p">,</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-40">}</span><span·class="p">;</span><span·class="w">181 ····</span><span·class="p"·data-group-id="1070134050-40">{</span><span·class="n">Channel</span><span·class="p">,</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-40">}</span><span·class="p">;</span><span·class="w">
182 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="3527422193-41">(</span><span·class="p"·data-group-id="3527422193-42">[</span><span·class="p"·data-group-id="3527422193-42">]</span><span·class="p"·data-group-id="3527422193-41">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">182 </span><span·class="nf">alloc</span><span·class="p"·data-group-id="1070134050-41">(</span><span·class="p"·data-group-id="1070134050-42">[</span><span·class="p"·data-group-id="1070134050-42">]</span><span·class="p"·data-group-id="1070134050-41">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
183 ····</span><span·class="ss">false</span><span·class="p">.</span><span·class="w">183 ····</span><span·class="ss">false</span><span·class="p">.</span><span·class="w">
  
184 </span><span·class="nf">free</span><span·class="p"·data-group-id="3527422193-43">(</span><span·class="n">Channel</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-43">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">184 </span><span·class="nf">free</span><span·class="p"·data-group-id="1070134050-43">(</span><span·class="n">Channel</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-43">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
185 ····</span><span·class="p"·data-group-id="3527422193-44">[</span><span·class="n">Channel</span><span·class="p">|</span><span·class="n">Channels</span><span·class="p"·data-group-id="3527422193-44">]</span><span·class="p">.</span></code></pre><p>The·test·case·is·implemented·as·follows:</p><pre><code[·...·truncated·by·diffoscope;·len:·213,·SHA:·3e76deeeefa4227d19118214ba2d6cec0eb043c82fb7c3f90d0d4d2244c3ebd6·...·]5-1">)</span><span·class="p">.</span><span·class="w">185 ····</span><span·class="p"·data-group-id="1070134050-44">[</span><span·class="n">Channel</span><span·class="p">|</span><span·class="n">Channels</span><span·class="p"·data-group-id="1070134050-44">]</span><span·class="p">.</span></code></pre><p>The·test·case·is·implemented·as·follows:</p><pre><code[·...·truncated·by·diffoscope;·len:·213,·SHA:·698c1fca0a4619a3bf5d96be18faa9c504165d43854a1a6b973ec5d7a21a9c59·...·]5-1">)</span><span·class="p">.</span><span·class="w">
186 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="7985568905-2">(</span><span·class="p"·data-group-id="7985568905-3">[</span><span·class="ss">s</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="7985568905-3">]</span><span·class="p"·data-group-id="7985568905-2">)</span><span·class="p">.</span><span·class="w">186 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6318114785-2">(</span><span·class="p"·data-group-id="6318114785-3">[</span><span·class="ss">s</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="6318114785-3">]</span><span·class="p"·data-group-id="6318114785-2">)</span><span·class="p">.</span><span·class="w">
  
187 </span><span·class="nf">s</span><span·class="p"·data-group-id="7985568905-4">(</span><span·class="p"·data-group-id="7985568905-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">187 </span><span·class="nf">s</span><span·class="p"·data-group-id="6318114785-4">(</span><span·class="p"·data-group-id="6318114785-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
188 ····</span><span·class="p"·data-group-id="7985568905-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Pid</span><span·class="p"·data-group-id="7985568905-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><s[·...·truncated·by·diffoscope;·len:·149,·SHA:·7927403fd752bc49875b7c7a05bd0db6dd7d4e924a145962ca7d1686d5b0b314·...·]5-6">)</span><span·class="p">,</span><span·class="w">188 ····</span><span·class="p"·data-group-id="6318114785-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Pid</span><span·class="p"·data-group-id="6318114785-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><s[·...·truncated·by·diffoscope;·len:·149,·SHA:·c44ded3592a2fc6846096e0963b92015b68d2c0a8ae825e2543bcf7249273f21·...·]5-6">)</span><span·class="p">,</span><span·class="w">
189 ····</span><span·class="p"·data-group-id="7985568905-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Ch1</span><span·class="p"·data-group-id="7985568905-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·ac3a8b58e65b3e6d5eda9dbad53565de503085705d52a8b3f7524f85ef7eb3bb·...·]5-8">)</span><span·class="p">,</span><span·class="w">189 ····</span><span·class="p"·data-group-id="6318114785-7">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">Ch1</span><span·class="p"·data-group-id="6318114785-7">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><s[·...·truncated·by·diffoscope;·len:·144,·SHA:·db290b1e5fab6f0c12bed3e6a1a58819efd70e8b4beb44d6fae3a01949cb9420·...·]5-8">)</span><span·class="p">,</span><span·class="w">
190 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><span·class="p">:</span><span·class="nf">free</span><span·class="p"·data-group-id="7985568905-9">(</span><span·class="n">Ch1</span><span·class="p"·data-group-id="7985568905-9">)</span><span·class="p">,</span><span·class="w">190 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><span·class="p">:</span><span·class="nf">free</span><span·class="p"·data-group-id="6318114785-9">(</span><span·class="n">Ch1</span><span·class="p"·data-group-id="6318114785-9">)</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="7985568905-10">(</span><span·class="p"·data-group-id="7985568905-10">)</span><span·class="p">.</span></code></pre><h3·id="preparation"·class="section-heading">191 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">channel</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="6318114785-10">(</span><span·class="p"·data-group-id="6318114785-10">)</span><span·class="p">.</span></code></pre><h3·id="preparation"·class="section-heading">
192 ··<a·href="#preparation"·class="hover-link">192 ··<a·href="#preparation"·class="hover-link">
193 ····<i·class="ri-link-m"·aria-hidden="true"></i>193 ····<i·class="ri-link-m"·aria-hidden="true"></i>
194 ··</a>194 ··</a>
195 ··<span·class="text">Preparation</span>195 ··<span·class="text">Preparation</span>
196 </h3>196 </h3>
197 <p>First·of·all,·Cover·must·be·started.·This·spawns·a·process·which·owns·the·Cover197 <p>First·of·all,·Cover·must·be·started.·This·spawns·a·process·which·owns·the·Cover
198 database·where·all·coverage·data·will·be·stored.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="0248941158-1">(</span><span·class="p"·data-group-id="0248941158-1">)</span><span·class="p">.</span><span·class="w">198 database·where·all·coverage·data·will·be·stored.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8767057864-1">(</span><span·class="p"·data-group-id="8767057864-1">)</span><span·class="p">.</span><span·class="w">
199 </span><span·class="p"·data-group-id="0248941158-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.90</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="0248941158-2">}</span></code></pre><p>To·include·other·nodes·in·the·coverage·analysis,·use199 </span><span·class="p"·data-group-id="8767057864-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.90</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="8767057864-2">}</span></code></pre><p>To·include·other·nodes·in·the·coverage·analysis,·use
200 <a·href="cover.html#start/1"><code·class="inline">cover:start/1</code></a>.·All·cover-compiled·modules·will·then·be·loaded·on·all200 <a·href="cover.html#start/1"><code·class="inline">cover:start/1</code></a>.·All·cover-compiled·modules·will·then·be·loaded·on·all
201 nodes,·and·data·from·all·nodes·will·be·summed·up·when·analysing.·For201 nodes,·and·data·from·all·nodes·will·be·summed·up·when·analysing.·For
202 simplicity·this·example·only·involves·the·current·node.</p><p>Before·any·analysis·can·take·place,·the·involved·modules·must·be202 simplicity·this·example·only·involves·the·current·node.</p><p>Before·any·analysis·can·take·place,·the·involved·modules·must·be
203 <em>cover-compiled</em>.·This·means·that·some·extra·information·is·added·to203 <em>cover-compiled</em>.·This·means·that·some·extra·information·is·added·to
204 the·module·before·beging·compiled·into·a·binary·and204 the·module·before·beging·compiled·into·a·binary·and
205 <a·href="cover_chapter.html#loading">loaded</a>.··The·source·file·of·the·module·is205 <a·href="cover_chapter.html#loading">loaded</a>.··The·source·file·of·the·module·is
206 not·affected·and·no·<code·class="inline">.beam</code>·file·is·created.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">compile_module</span><span·class="p"·data-group-id="7197570848-1">(</span><span·class="ss">channel</span><span·class="p"·data-group-id="7197570848-1">)</span><span·class="p">.</span><span·class="w">206 not·affected·and·no·<code·class="inline">.beam</code>·file·is·created.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">compile_module</span><span·class="p"·data-group-id="0311503636-1">(</span><span·class="ss">channel</span><span·class="p"·data-group-id="0311503636-1">)</span><span·class="p">.</span><span·class="w">
207 </span><span·class="p"·data-group-id="7197570848-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">channel</span><span·class="p"·data-group-id="7197570848-2">}</span></code></pre><p>Each·time·a·function·in·the·cover-compiled·module·<code·class="inline">channel</code>·is·called,207 </span><span·class="p"·data-group-id="0311503636-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">channel</span><span·class="p"·data-group-id="0311503636-2">}</span></code></pre><p>Each·time·a·function·in·the·cover-compiled·module·<code·class="inline">channel</code>·is·called,
208 information·about·the·call·will·be·added·to·the·Cover·database.·Run·the·test208 information·about·the·call·will·be·added·to·the·Cover·database.·Run·the·test
209 case:</p><pre><code·class="text">3&gt;·test:s().209 case:</p><pre><code·class="text">3&gt;·test:s().
210 ok</code></pre><p>Cover·analysis·is·performed·by·examining·the·contents·of·the·Cover·database.·The210 ok</code></pre><p>Cover·analysis·is·performed·by·examining·the·contents·of·the·Cover·database.·The
211 output·is·determined·by·two·parameters,·<code·class="inline">Level</code>·and·<code·class="inline">Analysis</code>.·<code·class="inline">Analysis</code>·is211 output·is·determined·by·two·parameters,·<code·class="inline">Level</code>·and·<code·class="inline">Analysis</code>.·<code·class="inline">Analysis</code>·is
212 either·<code·class="inline">coverage</code>·or·<code·class="inline">calls</code>·and·determines·the·type·of·the·analysis.·<code·class="inline">Level</code>·is212 either·<code·class="inline">coverage</code>·or·<code·class="inline">calls</code>·and·determines·the·type·of·the·analysis.·<code·class="inline">Level</code>·is
213 either·<code·class="inline">module</code>,·<code·class="inline">function</code>,·<code·class="inline">clause</code>,·or·<code·class="inline">line</code>·and·determines·the·level·of·the213 either·<code·class="inline">module</code>,·<code·class="inline">function</code>,·<code·class="inline">clause</code>,·or·<code·class="inline">line</code>·and·determines·the·level·of·the
214 analysis.</p><h3·id="coverage-analysis"·class="section-heading">214 analysis.</p><h3·id="coverage-analysis"·class="section-heading">
Offset 234, 200 lines modifiedOffset 234, 200 lines modified
234 ··<span·class="text">Coverage·Analysis</span>234 ··<span·class="text">Coverage·Analysis</span>
235 </h3>235 </h3>
236 <p>Analysis·of·type·<code·class="inline">coverage</code>·is·used·to·find·out·how·much·of·the·code·has·been236 <p>Analysis·of·type·<code·class="inline">coverage</code>·is·used·to·find·out·how·much·of·the·code·has·been
237 executed·and·how·much·has·not·been·executed.·Coverage·is·represented·by·a·tuple237 executed·and·how·much·has·not·been·executed.·Coverage·is·represented·by·a·tuple
238 <code·class="inline">{Cov,NotCov}</code>,·where·<code·class="inline">Cov</code>·is·the·number·of·executable·lines·that·have·been238 <code·class="inline">{Cov,NotCov}</code>,·where·<code·class="inline">Cov</code>·is·the·number·of·executable·lines·that·have·been
239 executed·at·least·once·and·<code·class="inline">NotCov</code>·is·the·number·of·executable·lines·that·have239 executed·at·least·once·and·<code·class="inline">NotCov</code>·is·the·number·of·executable·lines·that·have
240 not·been·executed.</p><p>If·the·analysis·is·made·on·module·level,·the·result·is·given·for·the·entire240 not·been·executed.</p><p>If·the·analysis·is·made·on·module·level,·the·result·is·given·for·the·entire
241 module·as·a·tuple·<code·class="inline">{Module,{Cov,NotCov}}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="2885920787-1">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">module</span><span·class="p"·data-group-id="2885920787-1">)</span><span·class="p">.</span><span·class="w">241 module·as·a·tuple·<code·class="inline">{Module,{Cov,NotCov}}</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5350219558-1">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">module</span><span·class="p"·data-group-id="5350219558-1">)</span><span·class="p">.</span><span·class="w">
242 </span><span·class="p"·data-group-id="2885920787-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="2885920787-3">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="p"·data-group-id="2885920787-4">{</span><span·class="mi">14</sp[·...·truncated·by·diffoscope;·len:·199,·SHA:·7736e80824ad8441649d47ffa209ccdab55c9fd9fbf7e27d57fb8ab363111fb0·...·]-2">}</span></code></pre><p>For·<code·class="inline">channel</code>,·the·result·shows·that·14·lines·in·the·module·are·covered·but·one242 </span><span·class="p"·data-group-id="5350219558-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5350219558-3">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="p"·data-group-id="5350219558-4">{</span><span·class="mi">14</sp[·...·truncated·by·diffoscope;·len:·199,·SHA:·f136758012c12a4d702507b09ed2a4cd730d2574ea10d900cbd71b3525564667·...·]-2">}</span></code></pre><p>For·<code·class="inline">channel</code>,·the·result·shows·that·14·lines·in·the·module·are·covered·but·one
243 line·is·not·covered.</p><p>If·the·analysis·is·made·on·function·level,·the·result·is·given·as·a·list·of243 line·is·not·covered.</p><p>If·the·analysis·is·made·on·function·level,·the·result·is·given·as·a·list·of
244 tuples·<code·class="inline">{Function,{Cov,NotCov}}</code>,·one·for·each·function·in·the·module.·A244 tuples·<code·class="inline">{Function,{Cov,NotCov}}</code>,·one·for·each·function·in·the·module.·A
245 function·is·specified·by·its·module·name,·function·name·and·arity:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5470531508-1">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">function</span><span·class="p"·data-group-id="5470531508-1">)</span><span·class="p">.</span><span·class="w">245 function·is·specified·by·its·module·name,·function·name·and·arity:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">5&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="1973626515-1">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">function</span><span·class="p"·data-group-id="1973626515-1">)</span><span·class="p">.</span><span·class="w">
246 </span><span·class="p"·data-group-id="5470531508-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="5470531508-3">[</span><span·class="p"·data-group-id="5470531508-4">{</span><span·class="p"·data-group-id="5470531508-5">{</span><span·class="ss">channel<[·...·truncated·by·diffoscope;·len:·411,·SHA:·61064201e3a44dd8c12819000302a12e18c14502f6143c5a09bbea1e135851b5·...·]-4">}</span><span·class="p">,</span><span·class="w">246 </span><span·class="p"·data-group-id="1973626515-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1973626515-3">[</span><span·class="p"·data-group-id="1973626515-4">{</span><span·class="p"·data-group-id="1973626515-5">{</span><span·class="ss">channel<[·...·truncated·by·diffoscope;·len:·411,·SHA:·6b9476b066f2165d393423f874cca6532a9a882c59d85143fb6d74ba3e7d5da5·...·]-4">}</span><span·class="p">,</span><span·class="w">
247 ·····</span><span·class="p"·data-group-id="5470531508-7">{</span><span·class="p"·data-group-id="5470531508-8">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">stop</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5470531508-8">}</s[·...·truncated·by·diffoscope;·len:·249,·SHA:·0e115c5aad8ba83e7619127b02328954e7df099ab92bca434b7cf196483f1e8d·...·]-7">}</span><span·class="p">,</span><span·class="w">247 ·····</span><span·class="p"·data-group-id="1973626515-7">{</span><span·class="p"·data-group-id="1973626515-8">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">stop</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="1973626515-8">}</s[·...·truncated·by·diffoscope;·len:·249,·SHA:·0782bec03414f85a3478b5633db2aa3892243529088ca1d094a5be18331c00a6·...·]-7">}</span><span·class="p">,</span><span·class="w">
248 ·····</span><span·class="p"·data-group-id="5470531508-10">{</span><span·class="p"·data-group-id="5470531508-11">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5470531508-11">[·...·truncated·by·diffoscope;·len:·255,·SHA:·f46bad6c0a354a74950e91246106cb89f38bdfdc7ed6122cdffff0aa899298e1·...·]-10">}</span><span·class="p">,</span><span·class="w">248 ·····</span><span·class="p"·data-group-id="1973626515-10">{</span><span·class="p"·data-group-id="1973626515-11">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="1973626515-11">[·...·truncated·by·diffoscope;·len:·255,·SHA:·a24113fc5c9d5166f01e9068ac7bdf7f16c91f3bba3f56efcd24805cbbef7438·...·]-10">}</span><span·class="p">,</span><span·class="w">
249 ·····</span><span·class="p"·data-group-id="5470531508-13">{</span><span·class="p"·data-group-id="5470531508-14">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5470531508-14">}[·...·truncated·by·diffoscope;·len:·254,·SHA:·45d9896376298c224c5dbf051ca5cc406fb89e3f462640cd7b235cbbcc01c5c2·...·]-13">}</span><span·class="p">,</span><span·class="w">249 ·····</span><span·class="p"·data-group-id="1973626515-13">{</span><span·class="p"·data-group-id="1973626515-14">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1973626515-14">}[·...·truncated·by·diffoscope;·len:·254,·SHA:·32f518d72dfd691d2f1d6d3702678af3e0962c3a93267bab9b8e8b2bfb24e780·...·]-13">}</span><span·class="p">,</span><span·class="w">
250 ·····</span><span·class="p"·data-group-id="5470531508-16">{</span><span·class="p"·data-group-id="5470531508-17">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">init</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5470531508-17">}[·...·truncated·by·diffoscope;·len:·254,·SHA:·a8847dac71175b443e52443e58ffbd82ac294e79f24a600629426274b54ca420·...·]-16">}</span><span·class="p">,</span><span·class="w">250 ·····</span><span·class="p"·data-group-id="1973626515-16">{</span><span·class="p"·data-group-id="1973626515-17">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">init</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1973626515-17">}[·...·truncated·by·diffoscope;·len:·254,·SHA:·d92020203bb2ec27a7718732bfb8ed058a2cdc27b8dcd792c08a37f83773941f·...·]-16">}</span><span·class="p">,</span><span·class="w">
251 ·····</span><span·class="p"·data-group-id="5470531508-19">{</span><span·class="p"·data-group-id="5470531508-20">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="547053150[·...·truncated·by·diffoscope;·len:·261,·SHA:·fcc170f85446c71f3b736fc18c2f3a4dc024e6a6c840225f70d86b0f4b4c6586·...·]-19">}</span><span·class="p">,</span><span·class="w">251 ·····</span><span·class="p"·data-group-id="1973626515-19">{</span><span·class="p"·data-group-id="1973626515-20">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="197362651[·...·truncated·by·diffoscope;·len:·261,·SHA:·2e2c221be2512439d65b1b1a748013f3bfb0f1d0d7d5f0eed1024121b559f615·...·]-19">}</span><span·class="p">,</span><span·class="w">
252 ·····</span><span·class="p"·data-group-id="5470531508-22">{</span><span·class="p"·data-group-id="5470531508-23">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">terminate</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5470531508-[·...·truncated·by·diffoscope;·len:·259,·SHA:·0e78614d52f566fbca67ede8e706df12980d38b5daf2cb770047821728213cac·...·]-22">}</span><span·class="p">,</span><span·class="w">252 ·····</span><span·class="p"·data-group-id="1973626515-22">{</span><span·class="p"·data-group-id="1973626515-23">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">terminate</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1973626515-[·...·truncated·by·diffoscope;·len:·259,·SHA:·7ce076fbad7603d21e20e18ea44cdf3e6ce0c84626a229117df3ec596d618fb1·...·]-22">}</span><span·class="p">,</span><span·class="w">
253 ·····</span><span·class="p"·data-group-id="5470531508-25">{</span><span·class="p"·data-group-id="5470531508-26">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">channels</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5470531508-2[·...·truncated·by·diffoscope;·len:·258,·SHA:·f719f3094a6a66771b132bd16eef8be7587fa1f6c2d3fb26d4c3b79842e91934·...·]-25">}</span><span·class="p">,</span><span·class="w">253 ·····</span><span·class="p"·data-group-id="1973626515-25">{</span><span·class="p"·data-group-id="1973626515-26">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">channels</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="1973626515-2[·...·truncated·by·diffoscope;·len:·258,·SHA:·8a1924646febe8fcc9d6567c79c1de5e754f48c9e9763d912462d6a226fcb047·...·]-25">}</span><span·class="p">,</span><span·class="w">
254 ·····</span><span·class="p"·data-group-id="5470531508-28">{</span><span·class="p"·data-group-id="5470531508-29">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5470531508-29">[·...·truncated·by·diffoscope;·len:·255,·SHA:·78c1d6d608b54d53c5a2c6f7346903361e58eca38dc0acf8c1e0d20141526253·...·]-28">}</span><span·class="p">,</span><span·class="w">254 ·····</span><span·class="p"·data-group-id="1973626515-28">{</span><span·class="p"·data-group-id="1973626515-29">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1973626515-29">[·...·truncated·by·diffoscope;·len:·255,·SHA:·64309f0dcffa9bef6132584bf05e1a15fbb3560a61659f3f0171779813e3a71b·...·]-28">}</span><span·class="p">,</span><span·class="w">
255 ·····</span><span·class="p"·data-group-id="5470531508-31">{</span><span·class="p"·data-group-id="5470531508-32">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5470531508-32">}[·...·truncated·by·diffoscope;·len:·361,·SHA:·1bf57a8b0c15bfaf953dee575750b9307c7f1f01461ea03ae0b0527a757cf405·...·]-2">}</span></code></pre><p>For·<code·class="inline">channel</code>,·the·result·shows·that·the·uncovered·line·is·in·the·function255 ·····</span><span·class="p"·data-group-id="1973626515-31">{</span><span·class="p"·data-group-id="1973626515-32">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1973626515-32">}[·...·truncated·by·diffoscope;·len:·361,·SHA:·56112f27f53b616cdf2438db4a232de3cc4c4c7826bb52f62aea7226f50e6d59·...·]-2">}</span></code></pre><p>For·<code·class="inline">channel</code>,·the·result·shows·that·the·uncovered·line·is·in·the·function
256 <code·class="inline">channel:alloc/1</code>.</p><p>If·the·analysis·is·made·on·clause·level,·the·result·is·given·as·a·list·of·tuples256 <code·class="inline">channel:alloc/1</code>.</p><p>If·the·analysis·is·made·on·clause·level,·the·result·is·given·as·a·list·of·tuples
257 <code·class="inline">{Clause,{Cov,NotCov}}</code>,·one·for·each·function·clause·in·the·module.·A·clause·is257 <code·class="inline">{Clause,{Cov,NotCov}}</code>,·one·for·each·function·clause·in·the·module.·A·clause·is
258 specified·by·its·module·name,·function·name,·arity·and·position·within·the258 specified·by·its·module·name,·function·name,·arity·and·position·within·the
259 function·definition:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="1242822582-1">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">clause</span><span·class="p"·data-group-id="1242822582-1">)</span><span·class="p">.</span><span·class="w">259 function·definition:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">6&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="3228128710-1">(</span><span·class="ss">channel</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">clause</span><span·class="p"·data-group-id="3228128710-1">)</span><span·class="p">.</span><span·class="w">
260 </span><span·class="p"·data-group-id="1242822582-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1242822582-3">[</span><span·class="p"·data-group-id="1242822582-4">{</span><span·class="p"·data-group-id="1242822582-5">{</span><span·class="ss">channel<[·...·truncated·by·diffoscope;·len:·460,·SHA:·11c81b55c6b69593e570a938edfbd0227e8c1ef1fccfe35d317ff965cdb5bdcf·...·]-4">}</span><span·class="p">,</span><span·class="w">260 </span><span·class="p"·data-group-id="3228128710-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3228128710-3">[</span><span·class="p"·data-group-id="3228128710-4">{</span><span·class="p"·data-group-id="3228128710-5">{</span><span·class="ss">channel<[·...·truncated·by·diffoscope;·len:·460,·SHA:·7bd480a39c1eb2e260f913766fce32b51eee2dd4073c15f3a262bda74c7a3c8f·...·]-4">}</span><span·class="p">,</span><span·class="w">
261 ·····</span><span·class="p"·data-group-id="1242822582-7">{</span><span·class="p"·data-group-id="1242822582-8">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">stop</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span>[·...·truncated·by·diffoscope;·len:·298,·SHA:·c061676555ced00070b915d24f83cb9d55b453d12fe2b233e616352a6ef3c4d2·...·]-7">}</span><span·class="p">,</span><span·class="w">261 ·····</span><span·class="p"·data-group-id="3228128710-7">{</span><span·class="p"·data-group-id="3228128710-8">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">stop</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span>[·...·truncated·by·diffoscope;·len:·298,·SHA:·d6560fea17418516e0e094eb6c6e5f018f528ffae875a2d4a76925958c526e1e·...·]-7">}</span><span·class="p">,</span><span·class="w">
262 ·····</span><span·class="p"·data-group-id="1242822582-10">{</span><span·class="p"·data-group-id="1242822582-11">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</sp[·...·truncated·by·diffoscope;·len:·304,·SHA:·0b5397e9e610f5c0aa590a3317acab96ad81c1097ff0e8f1be3e6f124779fcc1·...·]-10">}</span><span·class="p">,</span><span·class="w">262 ·····</span><span·class="p"·data-group-id="3228128710-10">{</span><span·class="p"·data-group-id="3228128710-11">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</sp[·...·truncated·by·diffoscope;·len:·304,·SHA:·1efb78a39e05d512daf5d0293ca15357a2a61363778cb3588764bcc933c7a166·...·]-10">}</span><span·class="p">,</span><span·class="w">
263 ·····</span><span·class="p"·data-group-id="1242822582-13">{</span><span·class="p"·data-group-id="1242822582-14">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</spa[·...·truncated·by·diffoscope;·len:·303,·SHA:·e7d07f4b3177798fec2a6cf7b3b5b25fababac9441d336d91a8eefe05696de7d·...·]-13">}</span><span·class="p">,</span><span·class="w">263 ·····</span><span·class="p"·data-group-id="3228128710-13">{</span><span·class="p"·data-group-id="3228128710-14">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">free</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</spa[·...·truncated·by·diffoscope;·len:·303,·SHA:·f4b6a23c8da24a4d93447186732c98fb8471cd2da458ae0cac2f6a687597bf4a·...·]-13">}</span><span·class="p">,</span><span·class="w">
264 ·····</span><span·class="p"·data-group-id="1242822582-16">{</span><span·class="p"·data-group-id="1242822582-17">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">init</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</spa[·...·truncated·by·diffoscope;·len:·303,·SHA:·261e346a161a48cd756494052ff66396c20859eaf9d075ccd2ff1f6acea20277·...·]-16">}</span><span·class="p">,</span><span·class="w">264 ·····</span><span·class="p"·data-group-id="3228128710-16">{</span><span·class="p"·data-group-id="3228128710-17">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">init</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</spa[·...·truncated·by·diffoscope;·len:·303,·SHA:·86a3ec3a88117505c005b752eb2bdaac2e308f81f7711588ac55d03113f122cf·...·]-16">}</span><span·class="p">,</span><span·class="w">
265 ·····</span><span·class="p"·data-group-id="1242822582-19">{</span><span·class="p"·data-group-id="1242822582-20">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·310,·SHA:·2b96a7a121b3b5f3d4d1dc3c5dd340c68e6eb019dd7d76eb4ee0ae18b0a007bb·...·]-19">}</span><span·class="p">,</span><span·class="w">265 ·····</span><span·class="p"·data-group-id="3228128710-19">{</span><span·class="p"·data-group-id="3228128710-20">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·310,·SHA:·1e188e056f76d97bc774ad0a19804e2fea92e54ad4f1cd1018fab87d0e695f3f·...·]-19">}</span><span·class="p">,</span><span·class="w">
266 ·····</span><span·class="p"·data-group-id="1242822582-22">{</span><span·class="p"·data-group-id="1242822582-23">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·310,·SHA:·93284f4ec2d78f41b2b63c0e6e269b2708b92fce1efe62c132943f878f1f9a96·...·]-22">}</span><span·class="p">,</span><span·class="w">266 ·····</span><span·class="p"·data-group-id="3228128710-22">{</span><span·class="p"·data-group-id="3228128710-23">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·310,·SHA:·f010c65c1df4cd885979ad6898d1ca4f4a85973450796e70248ea867dd821560·...·]-22">}</span><span·class="p">,</span><span·class="w">
267 ·····</span><span·class="p"·data-group-id="1242822582-25">{</span><span·class="p"·data-group-id="1242822582-26">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·310,·SHA:·bc5b9654f2699c6fdaa74e176211b7846e4b8ba6a29f8a2d974edd4c3d4a1cd6·...·]-25">}</span><span·class="p">,</span><span·class="w">267 ·····</span><span·class="p"·data-group-id="3228128710-25">{</span><span·class="p"·data-group-id="3228128710-26">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">handle_call</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·310,·SHA:·fa36bf8ef3d7890093a4ced7d3a2b6c4c948bbb3bf159a7f422ec9799d598d6c·...·]-25">}</span><span·class="p">,</span><span·class="w">
268 ·····</span><span·class="p"·data-group-id="1242822582-28">{</span><span·class="p"·data-group-id="1242822582-29">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">terminate</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">1[·...·truncated·by·diffoscope;·len:·308,·SHA:·d7da3c6685783f3f7f360ecef71f90c19bb817da87e321477c4007c020e6d6bb·...·]-28">}</span><span·class="p">,</span><span·class="w">268 ·····</span><span·class="p"·data-group-id="3228128710-28">{</span><span·class="p"·data-group-id="3228128710-29">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">terminate</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="mi">1[·...·truncated·by·diffoscope;·len:·308,·SHA:·b1af24f345176adab8a5b427b2308a96d1d8bb18646afa458e00aaf0d9edbef4·...·]-28">}</span><span·class="p">,</span><span·class="w">
269 ·····</span><span·class="p"·data-group-id="1242822582-31">{</span><span·class="p"·data-group-id="1242822582-32">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">channels</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1<[·...·truncated·by·diffoscope;·len:·307,·SHA:·224ff3c99a1c5b9a354764246b38ee4f7b960a66a28545ab0a88a147c7276ff9·...·]-31">}</span><span·class="p">,</span><span·class="w">269 ·····</span><span·class="p"·data-group-id="3228128710-31">{</span><span·class="p"·data-group-id="3228128710-32">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">channels</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1<[·...·truncated·by·diffoscope;·len:·307,·SHA:·b861c12d8622f644e132798fe0730a42410ad0785ec23298a6e7a35dc4deb367·...·]-31">}</span><span·class="p">,</span><span·class="w">
270 ·····</span><span·class="p"·data-group-id="1242822582-34">{</span><span·class="p"·data-group-id="1242822582-35">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</sp[·...·truncated·by·diffoscope;·len:·304,·SHA:·729536493bb5dd0fa4c9431dc8e2056f9aa66612571d3a7fbe4231af97d0e751·...·]-34">}</span><span·class="p">,</span><span·class="w">270 ·····</span><span·class="p"·data-group-id="3228128710-34">{</span><span·class="p"·data-group-id="3228128710-35">{</span><span·class="ss">channel</span><span·class="p">,</span><span·class="ss">alloc</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</sp[·...·truncated·by·diffoscope;·len:·304,·SHA:·278f2bb8bad97bff7cade73d59e6dd5894327fb9066c34c247e492a88cbac839·...·]-34">}</span><span·class="p">,</span><span·class="w">
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Offset 574, 15 lines modifiedOffset 574, 15 lines modified
574 ······<div·class="specs">574 ······<div·class="specs">
  
575 ··········<pre·translate="no"><span·class="attribute">-spec</span>·analyse(Mod,·Limit)·->·ModAnalysis·::·<a·href="#t:mod_analysis/0">mod_analysis</a>()575 ··········<pre·translate="no"><span·class="attribute">-spec</span>·analyse(Mod,·Limit)·->·ModAnalysis·::·<a·href="#t:mod_analysis/0">mod_analysis</a>()
576 ·················when·Mod·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:module/0">module</a>(),·Limit·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>().</pre>576 ·················when·Mod·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:module/0">module</a>(),·Limit·::·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#t:non_neg_integer/0">non_neg_integer</a>().</pre>
  
577 ······</div>577 ······</div>
  
578 <p>Collects·and·analyses·all·call·counters·for·module·<code·class="inline">Module</code>.</p><p>This·function·returns:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5969673059-1">{</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ModuleCount</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FuncAnalysisList</span><span·class="p"·data-group-id="596967[·...·truncated·by·diffoscope;·len:·650,·SHA:·72c973fb3e1c342298e694c0fbec78df69772d4ec6dc3aa7c0eafdf5abeae68d·...·]-1">}</span></code></pre><p>If·call·counters·are·still·running·while·<code·class="inline">analyse/0,1,2</code>·is·executing,·the·result578 <p>Collects·and·analyses·all·call·counters·for·module·<code·class="inline">Module</code>.</p><p>This·function·returns:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="5542699054-1">{</span><span·class="n">Module</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ModuleCount</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FuncAnalysisList</span><span·class="p"·data-group-id="554269[·...·truncated·by·diffoscope;·len:·650,·SHA:·81484b6fc8466354b43050618bc5628876869f7c2d9454ea39ccbc4f9fbfd949·...·]-1">}</span></code></pre><p>If·call·counters·are·still·running·while·<code·class="inline">analyse/0,1,2</code>·is·executing,·the·result
579 could·be·inconsistent.·This·happens·if·the·process·executing·<code·class="inline">analyse/0,1,2</code>579 could·be·inconsistent.·This·happens·if·the·process·executing·<code·class="inline">analyse/0,1,2</code>
580 is·scheduled·out·so·some·other·process·can·increment·the·counters·that·are580 is·scheduled·out·so·some·other·process·can·increment·the·counters·that·are
581 being·analysed.·Calling·<a·href="#pause/0"><code·class="inline">pause()</code></a>·before·analysing·takes·care·of581 being·analysed.·Calling·<a·href="#pause/0"><code·class="inline">pause()</code></a>·before·analysing·takes·care·of
582 that·problem.</p><p>All·functions·with·a·<code·class="inline">FuncCallCount</code>·lower·than·<code·class="inline">Limit</code>·are·excluded·from582 that·problem.</p><p>All·functions·with·a·<code·class="inline">FuncCallCount</code>·lower·than·<code·class="inline">Limit</code>·are·excluded·from
583 <code·class="inline">FuncAnalysisList</code>.·They·are·still·included·in·<code·class="inline">ModCallCount</code>,·though.</p>583 <code·class="inline">FuncAnalysisList</code>.·They·are·still·included·in·<code·class="inline">ModCallCount</code>,·though.</p>
584 ··</section>584 ··</section>
585 </section>585 </section>
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1063 ······<p·class="built-using">1063 ······<p·class="built-using">
1064 ········Built·using1064 ········Built·using
1065 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1065 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1066 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1066 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1067 ······</p>1067 ······</p>
1068 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1068 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1069 ····</footer>1069 ····</footer>
1070 ··</div>1070 ··</div>
1071 </main>1071 </main>
1072 </div>1072 </div>
1073 <script>1073 <script>
1074 ··function·mermaidLoaded()·{1074 ··function·mermaidLoaded()·{
1075 ····mermaid.initialize({1075 ····mermaid.initialize({
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152 no·trace·message·has·to·be·generated.·Some·measurements·indicates·performance152 no·trace·message·has·to·be·generated.·Some·measurements·indicates·performance
153 degradations·in·the·vicinity·of·10·percent.</p><p>The·following·sections·show·some·examples·of·profiling·with·<a·href="cprof.html"><code·class="inline">cprof</code></a>.</p><h2·id="example-background-work"·class="section-heading">153 degradations·in·the·vicinity·of·10·percent.</p><p>The·following·sections·show·some·examples·of·profiling·with·<a·href="cprof.html"><code·class="inline">cprof</code></a>.</p><h2·id="example-background-work"·class="section-heading">
154 ··<a·href="#example-background-work"·class="hover-link">154 ··<a·href="#example-background-work"·class="hover-link">
155 ····<i·class="ri-link-m"·aria-hidden="true"></i>155 ····<i·class="ri-link-m"·aria-hidden="true"></i>
156 ··</a>156 ··</a>
157 ··<span·class="text">Example:·Background·work</span>157 ··<span·class="text">Example:·Background·work</span>
158 </h2>158 </h2>
159 <p>From·the·Erlang·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8884151115-1">(</span><span·class="p"·data-group-id="8884151115-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">pause</span><span·class="p"·data-group-id="8884151115-2">(</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·1241a7c30985a21b1fa82065f19b748c34efdd9d2bed7a12954b7b70d4035940·...·]-2">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Stop·counters·just·after·start</span><span·class="w">159 <p>From·the·Erlang·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5515744140-1">(</span><span·class="p"·data-group-id="5515744140-1">)</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">pause</span><span·class="p"·data-group-id="5515744140-2">(</spa[·...·truncated·by·diffoscope;·len:·43,·SHA:·3ce982094feadfa4832909141a07e7bbd95a63ebba59e96bfcace2a76c3721e0·...·]-2">)</span><span·class="p">.</span><span·class="w">·</span><span·class="c1">%·Stop·counters·just·after·start</span><span·class="w">
160 </span><span·class="mi">8492</span><span·class="gp·unselectable">160 </span><span·class="mi">8492</span><span·class="gp·unselectable">
161 2&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="8884151115-3">(</span><span·class="p"·data-group-id="8884151115-3">)</span><span·class="p">.</span><span·class="w">161 2&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5515744140-3">(</span><span·class="p"·data-group-id="5515744140-3">)</span><span·class="p">.</span><span·class="w">
162 </span><span·class="p"·data-group-id="8884151115-4">{</span><span·class="mi">539</span><span·class="p">,</span><span·class="w">162 </span><span·class="p"·data-group-id="5515744140-4">{</span><span·class="mi">539</span><span·class="p">,</span><span·class="w">
163 ·</span><span·class="p"·data-group-id="8884151115-5">[</span><span·class="p"·data-group-id="8884151115-6">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="mi">155</span><span·class="p">,</span><span·class="w">163 ·</span><span·class="p"·data-group-id="5515744140-5">[</span><span·class="p"·data-group-id="5515744140-6">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="mi">155</span><span·class="p">,</span><span·class="w">
164 ·········</span><span·class="p"·data-group-id="8884151115-7">[</span><span·class="p"·data-group-id="8884151115-8">{</span><span·class="p"·data-group-id="8884151115-9">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">prep_check</span><span·class="p">,</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·152,·SHA:·00a26803adf5efb4fe29db076f09f5f001c48d3707c1d038563a6c181359b48e·...·]-8">}</span><span·class="p">,</span><span·class="w">164 ·········</span><span·class="p"·data-group-id="5515744140-7">[</span><span·class="p"·data-group-id="5515744140-8">{</span><span·class="p"·data-group-id="5515744140-9">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">prep_check</span><span·class="p">,</span><span·class="mi">[·...·truncated·by·diffoscope;·len:·152,·SHA:·3470a389e469be57911e74a987b4483c8971318695cea0e37b9c078251d72c6f·...·]-8">}</span><span·class="p">,</span><span·class="w">
165 ··········</span><span·class="p"·data-group-id="8884151115-10">{</span><span·class="p"·data-group-id="8884151115-11">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">used_records</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="8884151115[·...·truncated·by·diffoscope;·len:·104,·SHA:·2d60d720d97419392e55667243c5233c2ce4ce29e3abe7abb453b2ab00e41123·...·]-10">}</span><span·class="p">,</span><span·class="w">165 ··········</span><span·class="p"·data-group-id="5515744140-10">{</span><span·class="p"·data-group-id="5515744140-11">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">used_records</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5515744140[·...·truncated·by·diffoscope;·len:·104,·SHA:·e7e152dc3550ba0c41f5231792807a7ac9830e7d9aadff8257f651d5147612fb·...·]-10">}</span><span·class="p">,</span><span·class="w">
166 ··········</span><span·class="p"·data-group-id="8884151115-12">{</span><span·class="p"·data-group-id="8884151115-13">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">used_records</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="8884151115[·...·truncated·by·diffoscope;·len:·104,·SHA:·a68d936e7c067c8de0aca2a06a5e206e9c7cac4be0b2f18d6dee78efffacc211·...·]-12">}</span><span·class="p">,</span><span·class="w">166 ··········</span><span·class="p"·data-group-id="5515744140-12">{</span><span·class="p"·data-group-id="5515744140-13">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">used_records</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5515744140[·...·truncated·by·diffoscope;·len:·104,·SHA:·65d20b3bb5134e8c463f349a1940f00a38e9a3449e3acae54600b0eb40063d4f·...·]-12">}</span><span·class="p">,</span><span·class="w">
167 ··········</span><span·class="p"·data-group-id="8884151115-14">{</span><span·class="p"·data-group-id="8884151115-15">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">used_record_defs</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="888415[·...·truncated·by·diffoscope;·len:·107,·SHA:·376737c34e1dea34df9c2b3df7c121c3591a8a9797267d15c4f91fb9ef76b1b1·...·]-14">}</span><span·class="p">,</span><span·class="w">167 ··········</span><span·class="p"·data-group-id="5515744140-14">{</span><span·class="p"·data-group-id="5515744140-15">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">used_record_defs</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="551574[·...·truncated·by·diffoscope;·len:·107,·SHA:·d97b1017b0683e5eb8c4f2fdd1c5754eb2d86192b8ff885b00b53e2850f7ebd0·...·]-14">}</span><span·class="p">,</span><span·class="w">
168 ··········</span><span·class="p"·data-group-id="8884151115-16">{</span><span·class="p"·data-group-id="8884151115-17">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">record_defs</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="8884151115-[·...·truncated·by·diffoscope;·len:·102,·SHA:·e79701342845383441bd8e8737260577ed872029c908d5dfe1f41b370a3899bd·...·]-16">}</span><span·class="p">,</span><span·class="w">168 ··········</span><span·class="p"·data-group-id="5515744140-16">{</span><span·class="p"·data-group-id="5515744140-17">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">record_defs</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5515744140-[·...·truncated·by·diffoscope;·len:·102,·SHA:·5df46104a6cb98987066b75083e57245bdd94f06922a21401494081cdd308ca4·...·]-16">}</span><span·class="p">,</span><span·class="w">
169 ··········</span><span·class="p"·data-group-id="8884151115-18">{</span><span·class="p"·data-group-id="8884151115-19">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">record_bindings</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="8884151[·...·truncated·by·diffoscope;·len:·106,·SHA:·67787b76fc8c70b745309a5e2dcfd43876f16c8e7a6a275de615f3ca0efafc35·...·]-18">}</span><span·class="p">,</span><span·class="w">169 ··········</span><span·class="p"·data-group-id="5515744140-18">{</span><span·class="p"·data-group-id="5515744140-19">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">record_bindings</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5515744[·...·truncated·by·diffoscope;·len:·106,·SHA:·b9be0dad5d0ec5da86042688895c686905a765990b9145c964fa47fba8478937·...·]-18">}</span><span·class="p">,</span><span·class="w">
170 ··········</span><span·class="p"·data-group-id="8884151115-20">{</span><span·class="p"·data-group-id="8884151115-21">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">exprs</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="8884151115-21">}<[·...·truncated·by·diffoscope;·len:·96,·SHA:·a0dfd7afc44ba064ef4d3b484b02db2550ffe1a3408236f41fcd8dc401e5f87b·...·]-20">}</span><span·class="p">,</span><span·class="w">170 ··········</span><span·class="p"·data-group-id="5515744140-20">{</span><span·class="p"·data-group-id="5515744140-21">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">exprs</span><span·class="p">,</span><span·class="mi">7</span><span·class="p"·data-group-id="5515744140-21">}<[·...·truncated·by·diffoscope;·len:·96,·SHA:·d9fd064415058234aab2c2d04e3449bddb9702b1e4574b6c7d7def8037b7d98e·...·]-20">}</span><span·class="p">,</span><span·class="w">
171 ··········</span><span·class="p"·data-group-id="8884151115-22">{</span><span·class="p"·data-group-id="8884151115-23">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">expr</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="8884151115-23">}</[·...·truncated·by·diffoscope;·len:·95,·SHA:·3f900a64a36e7a09154e10b0bf5e21370efb627467272979162966b0b867ac42·...·]-22">}</span><span·class="p">,</span><span·class="w">171 ··········</span><span·class="p"·data-group-id="5515744140-22">{</span><span·class="p"·data-group-id="5515744140-23">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">expr</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5515744140-23">}</[·...·truncated·by·diffoscope;·len:·95,·SHA:·e7fe607b0014734356974f7f2d643b6121b0aa5df6c014515ff1af98bbee3284·...·]-22">}</span><span·class="p">,</span><span·class="w">
172 ··········</span><span·class="p"·data-group-id="8884151115-24">{</span><span·class="p"·data-group-id="8884151115-25">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">expand_records</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="88841511[·...·truncated·by·diffoscope;·len:·105,·SHA:·024f23415548f84f6924354fd1f32cce62b88ce25d72b0d56bc50ac2221f1ac1·...·]-24">}</span><span·class="p">,</span><span·class="w">172 ··········</span><span·class="p"·data-group-id="5515744140-24">{</span><span·class="p"·data-group-id="5515744140-25">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">expand_records</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="55157441[·...·truncated·by·diffoscope;·len:·105,·SHA:·c2ad151f7727854901d43d96240a4574f458a0305f112b69a03f2fb95ec3388f·...·]-24">}</span><span·class="p">,</span><span·class="w">
173 ··········</span><span·class="p"·data-group-id="8884151115-26">{</span><span·class="p"·data-group-id="8884151115-27">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">check_command</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="888415111[·...·truncated·by·diffoscope;·len:·104,·SHA:·3039e72ee748bc0205efee0bc08ad5c7ff71b06e7d23c8ba7256ad1951adf2a7·...·]-26">}</span><span·class="p">,</span><span·class="w">173 ··········</span><span·class="p"·data-group-id="5515744140-26">{</span><span·class="p"·data-group-id="5515744140-27">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">check_command</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="551574414[·...·truncated·by·diffoscope;·len:·104,·SHA:·488dd9c3f204f4540eedfef1d28b260ff1c9b20dab35ca1b14c58d339d1fb016·...·]-26">}</span><span·class="p">,</span><span·class="w">
174 ··········</span><span·class="p"·data-group-id="8884151115-28">{</span><span·class="p"·data-group-id="8884151115-29">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">apply_fun</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="8884151115-29[·...·truncated·by·diffoscope;·len:·100,·SHA:·6c23543e96ba090852cf1b122faf23d8c2e4eb7f13ccf1ba803c775e5324aa47·...·]-28">}</span><span·class="p">,</span><span·class="w">174 ··········</span><span·class="p"·data-group-id="5515744140-28">{</span><span·class="p"·data-group-id="5515744140-29">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">apply_fun</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="5515744140-29[·...·truncated·by·diffoscope;·len:·100,·SHA:·dd345f98ddd0486a544f1ae9fff52c62aa8bcb4a1305bd75723fb76245011afe·...·]-28">}</span><span·class="p">,</span><span·class="w">
175 ··········</span><span·class="p"·data-group-id="8884151115-30">{</span><span·class="p"·data-group-id="8884151115-31">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">&#39;-exprs/7-lc$^0/1-0-&#39;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·120,·SHA:·43bcf8463831c87a6b0958852eaca85ca856b18fecc2099882bc1a2eeeab562a·...·]-30">}</span><span·class="p">,</span><span·class="w">175 ··········</span><span·class="p"·data-group-id="5515744140-30">{</span><span·class="p"·data-group-id="5515744140-31">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">&#39;-exprs/7-lc$^0/1-0-&#39;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·120,·SHA:·a2cb092f84070eea214b8416a5d177ae1efb12e20f6a77334b629703f458509e·...·]-30">}</span><span·class="p">,</span><span·class="w">
176 ··········</span><span·class="p"·data-group-id="8884151115-32">{</span><span·class="p"·data-group-id="8884151115-33">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">&#39;-eval_loop/3-fun-0-&#39;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·227,·SHA:·adbdadef6bac31ea6baf9e6e4f05e9a0b66629a4a30b625ac77360e698f14314·...·]-6">}</span><span·class="p">,</span><span·class="w">176 ··········</span><span·class="p"·data-group-id="5515744140-32">{</span><span·class="p"·data-group-id="5515744140-33">{</span><span·class="ss">shell</span><span·class="p">,</span><span·class="ss">&#39;-eval_loop/3-fun-0-&#39;</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·227,·SHA:·4c0580e8b4e1fc1a089032d8490c51a0f37b1ba5f1022c87a3993a96e22f5937·...·]-6">}</span><span·class="p">,</span><span·class="w">
177 ··</span><span·class="c1">%%·Information·about·many·modules·omitted.</span><span·class="w">177 ··</span><span·class="c1">%%·Information·about·many·modules·omitted.</span><span·class="w">
178 ·····················</span><span·class="p">.</span><span·class="w">178 ·····················</span><span·class="p">.</span><span·class="w">
179 ·····················</span><span·class="p">.</span><span·class="w">179 ·····················</span><span·class="p">.</span><span·class="w">
180 ·····················</span><span·class="p">.</span><span·class="w">180 ·····················</span><span·class="p">.</span><span·class="w">
181 ··</span><span·class="c1">%%·Here·is·the·last·part.</span><span·class="w">181 ··</span><span·class="c1">%%·Here·is·the·last·part.</span><span·class="w">
182 ··</span><span·class="p"·data-group-id="8884151115-34">{</span><span·class="ss">erts_internal</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="p"·data-group-id="8884151115-35">[</span><span·class="p"·data-group-id="8884151115-36">{</span><span·class="p"[·...·truncated·by·diffoscope;·len:·438,·SHA:·3ee600421eb334f9b807e6c466322744f35c1a1b0ea66542a4938fbfca4105e8·...·]-34">}</span><span·class="p">,</span><span·class="w">182 ··</span><span·class="p"·data-group-id="5515744140-34">{</span><span·class="ss">erts_internal</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="p"·data-group-id="5515744140-35">[</span><span·class="p"·data-group-id="5515744140-36">{</span><span·class="p"[·...·truncated·by·diffoscope;·len:·438,·SHA:·1c1b5a728f1231d6a3d016d6ba6bb312f32768f58e8b3c98228a865752190cae·...·]-34">}</span><span·class="p">,</span><span·class="w">
183 ··</span><span·class="p"·data-group-id="8884151115-38">{</span><span·class="ss">otp_internal</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group-id="8884151115-39">[</span><span·class="p"·data-group-id="8884151115-40">{</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·431,·SHA:·76dc32bca6cdcfc35c28546441c8ef666efa97239f12201aae2a61e27f8143d8·...·]-38">}</span><span·class="p">,</span><span·class="w">183 ··</span><span·class="p"·data-group-id="5515744140-38">{</span><span·class="ss">otp_internal</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group-id="5515744140-39">[</span><span·class="p"·data-group-id="5515744140-40">{</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·431,·SHA:·59e0a0f00333f5948bb776e2bf6baabdc73e1f7ae849be6795cd1d7fb587b13e·...·]-38">}</span><span·class="p">,</span><span·class="w">
184 ··</span><span·class="p"·data-group-id="8884151115-42">{</span><span·class="ss">maps</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group-id="8884151115-43">[</span><span·class="p"·data-group-id="8884151115-44">{</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·416,·SHA:·8bccc69d724865797541abb69f1d590b8b965a6501f42da7a73e78d8efd44e79·...·]-42">}</span><span·class="p">,</span><span·class="w">184 ··</span><span·class="p"·data-group-id="5515744140-42">{</span><span·class="ss">maps</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group-id="5515744140-43">[</span><span·class="p"·data-group-id="5515744140-44">{</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·416,·SHA:·3e22aea1d5717bd979fbcd7ef169f8d12659b6056dbf2a71fca93d61c88063eb·...·]-42">}</span><span·class="p">,</span><span·class="w">
185 ··</span><span·class="p"·data-group-id="8884151115-46">{</span><span·class="ss">erl_internal</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group-id="8884151115-47">[</span><span·class="p"·data-group-id="8884151115-48">{</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·533,·SHA:·2158f0f00ccc57c8796542c1bf637f1810a186239f8d0a1ec12ee809963c130a·...·]-4">}</span><span·class="gp·unselectable">185 ··</span><span·class="p"·data-group-id="5515744140-46">{</span><span·class="ss">erl_internal</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="p"·data-group-id="5515744140-47">[</span><span·class="p"·data-group-id="5515744140-48">{</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·533,·SHA:·59cea4318f021bec969670a1faaae3cc1d405c802e7ec61bda3b04bf848fba6c·...·]-4">}</span><span·class="gp·unselectable">
186 3&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="8884151115-50">(</span><span·class="ss">cprof</span><span·class="p"·data-group-id="8884151115-50">)</span><span·class="p">.</span><span·class="w">186 3&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5515744140-50">(</span><span·class="ss">cprof</span><span·class="p"·data-group-id="5515744140-50">)</span><span·class="p">.</span><span·class="w">
187 </span><span·class="p"·data-group-id="8884151115-51">{</span><span·class="ss">cprof</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-group-id="8884151115-52">[</span><span·class="p"·data-group-id="8884151115-53">{</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·831,·SHA:·d3cd8c9b583f90fdc5d098bf6a3f10198d5bacda76d40564c0c23ad0f8dcfbcc·...·]-51">}</span><span·class="gp·unselectable">187 </span><span·class="p"·data-group-id="5515744140-51">{</span><span·class="ss">cprof</span><span·class="p">,</span><span·class="mi">3</span><span·class="p">,</span><span·class="p"·data-group-id="5515744140-52">[</span><span·class="p"·data-group-id="5515744140-53">{</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·831,·SHA:·c0db4443e6ee85817d08f0267c334a1f6aab02d1afff6f68ddf2fbb9458b8b64·...·]-51">}</span><span·class="gp·unselectable">
188 4&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="8884151115-57">(</span><span·class="p"·data-group-id="8884151115-57">)</span><span·class="p">.</span><span·class="w">188 4&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="5515744140-57">(</span><span·class="p"·data-group-id="5515744140-57">)</span><span·class="p">.</span><span·class="w">
189 </span><span·class="mi">8586</span></code></pre><p>The·example·showed·some·of·the·background·work·that·the·shell·performs·just·to189 </span><span·class="mi">8586</span></code></pre><p>The·example·showed·some·of·the·background·work·that·the·shell·performs·just·to
190 interpret·the·first·command·line.</p><p>What·is·captured·in·this·example·is·the·part·of·the·work·the·shell·does·while190 interpret·the·first·command·line.</p><p>What·is·captured·in·this·example·is·the·part·of·the·work·the·shell·does·while
191 interpreting·the·command·line·that·occurs·between·the·actual·calls·to191 interpreting·the·command·line·that·occurs·between·the·actual·calls·to
192 <a·href="cprof.html#start/0"><code·class="inline">cprof:start()</code></a>·and·<a·href="cprof.html#analyse/1"><code·class="inline">cprof:analyse()</code></a>.</p><h2·id="example-one-module"·class="section-heading">192 <a·href="cprof.html#start/0"><code·class="inline">cprof:start()</code></a>·and·<a·href="cprof.html#analyse/1"><code·class="inline">cprof:analyse()</code></a>.</p><h2·id="example-one-module"·class="section-heading">
193 ··<a·href="#example-one-module"·class="hover-link">193 ··<a·href="#example-one-module"·class="hover-link">
194 ····<i·class="ri-link-m"·aria-hidden="true"></i>194 ····<i·class="ri-link-m"·aria-hidden="true"></i>
195 ··</a>195 ··</a>
196 ··<span·class="text">Example:·One·module</span>196 ··<span·class="text">Example:·One·module</span>
197 </h2>197 </h2>
198 <p>From·the·Erlang·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="5999571900-1">(</span><span·class="p"·data-group-id="5999571900-1">)</span><span·class="p">,</span><span·class="n">R</span><span·class="o">=</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">day_of_the_week</span><span·class="p[·...·truncated·by·diffoscope;·len:·418,·SHA:·cfab5d3cef7abb9b1cfab23d3ff1a2a777c5eb2ed53b4d8c77da89a38e5536d4·...·]0-3">)</span><span·class="p">,</span><span·class="n">R</span><span·class="p">.</span><span·class="w">198 <p>From·the·Erlang·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="2863706550-1">(</span><span·class="p"·data-group-id="2863706550-1">)</span><span·class="p">,</span><span·class="n">R</span><span·class="o">=</span><span·class="nc">calendar</span><span·class="p">:</span><span·class="nf">day_of_the_week</span><span·class="p[·...·truncated·by·diffoscope;·len:·418,·SHA:·bb5517affb59133ac0f94a017c0a565fa3a29f9324519907513e83619bf09ac4·...·]0-3">)</span><span·class="p">,</span><span·class="n">R</span><span·class="p">.</span><span·class="w">
199 </span><span·class="mi">1</span><span·class="gp·unselectable">199 </span><span·class="mi">1</span><span·class="gp·unselectable">
200 2&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5999571900-4">(</span><span·class="ss">calendar</span><span·class="p"·data-group-id="5999571900-4">)</span><span·class="p">.</span><span·class="w">200 2&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="2863706550-4">(</span><span·class="ss">calendar</span><span·class="p"·data-group-id="2863706550-4">)</span><span·class="p">.</span><span·class="w">
201 </span><span·class="p"·data-group-id="5999571900-5">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="w">201 </span><span·class="p"·data-group-id="2863706550-5">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="mi">9</span><span·class="p">,</span><span·class="w">
202 ··········</span><span·class="p"·data-group-id="5999571900-6">[</span><span·class="p"·data-group-id="5999571900-7">{</span><span·class="p"·data-group-id="5999571900-8">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">last_day_of_the_month1</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·165,·SHA:·cf7d27a039706a3d2d2238cf7259d8802f91c2af9ea5bc31810c254db3823a93·...·]0-7">}</span><span·class="p">,</span><span·class="w">202 ··········</span><span·class="p"·data-group-id="2863706550-6">[</span><span·class="p"·data-group-id="2863706550-7">{</span><span·class="p"·data-group-id="2863706550-8">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">last_day_of_the_month1</span><span·class="p">,</span><s[·...·truncated·by·diffoscope;·len:·165,·SHA:·3d21423df486f93a33a100a11b212e7756e05af299561d44fa8a65a164054597·...·]0-7">}</span><span·class="p">,</span><span·class="w">
203 ···········</span><span·class="p"·data-group-id="5999571900-9">{</span><span·class="p"·data-group-id="5999571900-10">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">last_day_of_the_month</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·113,·SHA:·356b4708740ce6f717e0a8ddd4cd1d8cb28d6c3ab259f3383f63f89d31cbcffa·...·]0-9">}</span><span·class="p">,</span><span·class="w">203 ···········</span><span·class="p"·data-group-id="2863706550-9">{</span><span·class="p"·data-group-id="2863706550-10">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">last_day_of_the_month</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·113,·SHA:·154de6f16e4651710f2708ac9c4f92a151d860af9f1ece73c3f23b459a16c41e·...·]0-9">}</span><span·class="p">,</span><span·class="w">
204 ···········</span><span·class="p"·data-group-id="5999571900-11">{</span><span·class="p"·data-group-id="5999571900-12">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">is_leap_year1</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="599957[·...·truncated·by·diffoscope;·len:·106,·SHA:·93a81df69cd07fd78ec7cde4be4421e3e41015c8b55a8745357104a0a2ae1115·...·]0-11">}</span><span·class="p">,</span><span·class="w">204 ···········</span><span·class="p"·data-group-id="2863706550-11">{</span><span·class="p"·data-group-id="2863706550-12">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">is_leap_year1</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="286370[·...·truncated·by·diffoscope;·len:·106,·SHA:·1564664acd77bfcfe9b15352b98782dcc55d3e91bc062263204638f9dd697c6b·...·]0-11">}</span><span·class="p">,</span><span·class="w">
205 ···········</span><span·class="p"·data-group-id="5999571900-13">{</span><span·class="p"·data-group-id="5999571900-14">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">is_leap_year</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5999571[·...·truncated·by·diffoscope;·len:·105,·SHA:·1fbabc91fe1f07acaed730f1f79a1a181e10691e3a146ad73fe19462248eb9d3·...·]0-13">}</span><span·class="p">,</span><span·class="w">205 ···········</span><span·class="p"·data-group-id="2863706550-13">{</span><span·class="p"·data-group-id="2863706550-14">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">is_leap_year</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="2863706[·...·truncated·by·diffoscope;·len:·105,·SHA:·dd75a046b4ed6027d32b51b525b0e04c789fdbe2f9006f5a69d7cb32d2bad4b4·...·]0-13">}</span><span·class="p">,</span><span·class="w">
206 ···········</span><span·class="p"·data-group-id="5999571900-15">{</span><span·class="p"·data-group-id="5999571900-16">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">dy</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5999571900-16">}<[·...·truncated·by·diffoscope;·len:·95,·SHA:·7db05664b9479231209a29d123146d338de82905ab523a3788e0b13c9a48a7f2·...·]0-15">}</span><span·class="p">,</span><span·class="w">206 ···········</span><span·class="p"·data-group-id="2863706550-15">{</span><span·class="p"·data-group-id="2863706550-16">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">dy</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="2863706550-16">}<[·...·truncated·by·diffoscope;·len:·95,·SHA:·c8bd355f99808cbe4c68e93bfd91ce3b21577479b5ca7daaecbd7c92f723e504·...·]0-15">}</span><span·class="p">,</span><span·class="w">
207 ···········</span><span·class="p"·data-group-id="5999571900-17">{</span><span·class="p"·data-group-id="5999571900-18">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">dm</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5999571900-18">}<[·...·truncated·by·diffoscope;·len:·95,·SHA:·7db05664b9479231209a29d123146d338de82905ab523a3788e0b13c9a48a7f2·...·]0-17">}</span><span·class="p">,</span><span·class="w">207 ···········</span><span·class="p"·data-group-id="2863706550-17">{</span><span·class="p"·data-group-id="2863706550-18">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">dm</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="2863706550-18">}<[·...·truncated·by·diffoscope;·len:·95,·SHA:·c8bd355f99808cbe4c68e93bfd91ce3b21577479b5ca7daaecbd7c92f723e504·...·]0-17">}</span><span·class="p">,</span><span·class="w">
208 ···········</span><span·class="p"·data-group-id="5999571900-19">{</span><span·class="p"·data-group-id="5999571900-20">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">df</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5999571900-20">}<[·...·truncated·by·diffoscope;·len:·95,·SHA:·7db05664b9479231209a29d123146d338de82905ab523a3788e0b13c9a48a7f2·...·]0-19">}</span><span·class="p">,</span><span·class="w">208 ···········</span><span·class="p"·data-group-id="2863706550-19">{</span><span·class="p"·data-group-id="2863706550-20">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">df</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="2863706550-20">}<[·...·truncated·by·diffoscope;·len:·95,·SHA:·c8bd355f99808cbe4c68e93bfd91ce3b21577479b5ca7daaecbd7c92f723e504·...·]0-19">}</span><span·class="p">,</span><span·class="w">
209 ···········</span><span·class="p"·data-group-id="5999571900-21">{</span><span·class="p"·data-group-id="5999571900-22">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">day_of_the_week</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="5999[·...·truncated·by·diffoscope;·len:·108,·SHA:·63a6fda3ada5bc8b993cfb715dd5f46e963ba99e22f19cc7ab4b96cf7bb907ca·...·]0-21">}</span><span·class="p">,</span><span·class="w">209 ···········</span><span·class="p"·data-group-id="2863706550-21">{</span><span·class="p"·data-group-id="2863706550-22">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">day_of_the_week</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="2863[·...·truncated·by·diffoscope;·len:·108,·SHA:·5c7c78911d759f72777dd990d1da9018f1a3805f51f2770d19b5842fa3121899·...·]0-21">}</span><span·class="p">,</span><span·class="w">
210 ···········</span><span·class="p"·data-group-id="5999571900-23">{</span><span·class="p"·data-group-id="5999571900-24">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">date_to_gregorian_days</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·222,·SHA:·c711efda9daa17bf41dcccf7c4ddfb685cb04b93efe3f267aa1d6bbcb5e5ee9e·...·]0-5">}</span><span·class="gp·unselectable">210 ···········</span><span·class="p"·data-group-id="2863706550-23">{</span><span·class="p"·data-group-id="2863706550-24">{</span><span·class="ss">calendar</span><span·class="p">,</span><span·class="ss">date_to_gregorian_days</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-i[·...·truncated·by·diffoscope;·len:·222,·SHA:·aec325fdb8b228659ba15930d2c7ab782227050202057962d471fd04248b04c2·...·]0-5">}</span><span·class="gp·unselectable">
211 3&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="5999571900-25">(</span><span·class="p"·data-group-id="5999571900-25">)</span><span·class="p">.</span><span·class="w">211 3&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="2863706550-25">(</span><span·class="p"·data-group-id="2863706550-25">)</span><span·class="p">.</span><span·class="w">
212 </span><span·class="mi">8648</span></code></pre><p>The·example·tells·us·that·&quot;Aktiebolaget·LM·Ericsson·&amp;·Co&quot;·was·registered·on·a212 </span><span·class="mi">8648</span></code></pre><p>The·example·tells·us·that·&quot;Aktiebolaget·LM·Ericsson·&amp;·Co&quot;·was·registered·on·a
213 Monday·(since·the·return·value·of·the·first·command·is·1),·and·that·the213 Monday·(since·the·return·value·of·the·first·command·is·1),·and·that·the
214 <code·class="inline">calendar</code>·module·needed·9·function·calls·to·calculate·that.</p><p>Using·<code·class="inline">cprof:analyse()</code>·in·this·example·also·shows·approximately·the·same214 <code·class="inline">calendar</code>·module·needed·9·function·calls·to·calculate·that.</p><p>Using·<code·class="inline">cprof:analyse()</code>·in·this·example·also·shows·approximately·the·same
215 background·work·as·in·the·first·example.</p><h2·id="example-in-the-code"·class="section-heading">215 background·work·as·in·the·first·example.</p><h2·id="example-in-the-code"·class="section-heading">
216 ··<a·href="#example-in-the-code"·class="hover-link">216 ··<a·href="#example-in-the-code"·class="hover-link">
217 ····<i·class="ri-link-m"·aria-hidden="true"></i>217 ····<i·class="ri-link-m"·aria-hidden="true"></i>
218 ··</a>218 ··</a>
219 ··<span·class="text">Example:·In·the·code</span>219 ··<span·class="text">Example:·In·the·code</span>
220 </h2>220 </h2>
221 <p>Write·a·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8950611086-1">(</span><span·class="ss">sort</span><span·class="p"·data-group-id="8950611086-1">)</span><span·class="p">.</span><span·class="w"> 
222 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8950611086-2">(</span><span·class="p"·data-group-id="8950611086-3">[</span><span·class="ss">do</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"[·...·truncated·by·diffoscope;·len:·81,·SHA:·248f6564e73f1e7158b84b50ae78604c95978d2b1bc7bb9c89df8a9c33809f2d·...·]">)</span><span·class="p">.</span><span·class="w">221 <p>Write·a·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8689613045-1">(</span><span·class="ss">sort</span><span·class="p"·data-group-id="8689613045-1">)</span><span·class="p">.</span><span·class="w">
 222 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8689613045-2">(</span><span·class="p"·data-group-id="8689613045-3">[</span><span·class="ss">do</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="8689613045-3">]</span><span·class="p"·data-group-id="8689613045-2">)</span><span·class="p">.</span><span·class="w">
  
223 </span><span·class="nf">do</span><span·class="p"·data-group-id="8950611086-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="8950611086-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">223 </span><span·class="nf">do</span><span·class="p"·data-group-id="8689613045-4">(</span><span·class="n">N</span><span·class="p"·data-group-id="8689613045-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
224 ····</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="8950611086-5">(</span><span·class="p"·data-group-id="8950611086-5">)</span><span·class="p">,</span><span·class="w">224 ····</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="8689613045-5">(</span><span·class="p"·data-group-id="8689613045-5">)</span><span·class="p">,</span><span·class="w">
225 ····</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8950611086-6">(</span><span·class="p"·data-group-id="8950611086-6">)</span><span·class="p">,</span><span·class="w">225 ····</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="8689613045-6">(</span><span·class="p"·data-group-id="8689613045-6">)</span><span·class="p">,</span><span·class="w">
226 ····</span><span·class="nf">do</span><span·class="p"·data-group-id="8950611086-7">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8950611086-8">[</span><span·class="p"·data-group-id="8950611086-8">]</span><span·class="p"·data-group-id="8950611086-7">)</span><span·class="p">.</span><span·class="w">226 ····</span><span·class="nf">do</span><span·class="p"·data-group-id="8689613045-7">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8689613045-8">[</span><span·class="p"·data-group-id="8689613045-8">]</span><span·class="p"·data-group-id="8689613045-7">)</span><span·class="p">.</span><span·class="w">
  
227 </span><span·class="nf">do</span><span·class="p"·data-group-id="8950611086-9">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="8950611086-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 </span><span·class="nf">do</span><span·class="p"·data-group-id="8689613045-9">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="8689613045-9">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">sort</span><span·class="p"·data-group-id="8950611086-10">(</span><span·class="n">L</span><span·class="p"·data-group-id="8950611086-10">)</span><span·class="p">,</span><span·class="w">228 ····</span><span·class="n">R</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">sort</span><span·class="p"·data-group-id="8689613045-10">(</span><span·class="n">L</span><span·class="p"·data-group-id="8689613045-10">)</span><span·class="p">,</span><span·class="w">
229 ····</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">pause</span><span·class="p"·data-group-id="8950611086-11">(</span><span·class="p"·data-group-id="8950611086-11">)</span><span·class="p">,</span><span·class="w">229 ····</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">pause</span><span·class="p"·data-group-id="8689613045-11">(</span><span·class="p"·data-group-id="8689613045-11">)</span><span·class="p">,</span><span·class="w">
230 ····</span><span·class="n">R</span><span·class="p">;</span><span·class="w">230 ····</span><span·class="n">R</span><span·class="p">;</span><span·class="w">
231 </span><span·class="nf">do</span><span·class="p"·data-group-id="8950611086-12">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="8950611086-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 </span><span·class="nf">do</span><span·class="p"·data-group-id="8689613045-12">(</span><span·class="n">N</span><span·class="p">,</span><span·class="w">·</span><span·class="n">L</span><span·class="p"·data-group-id="8689613045-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ····</span><span·class="nf">do</span><span·class="p"·data-group-id="8950611086-13">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8950611086-14">[</span><span·class="nc">rand</span><span·class="p">:</span><span·c[·...·truncated·by·diffoscope;·len:·715,·SHA:·abd68e5f9cedc72c601f5163432f9fbfae03756e507f4735fcea0d0e7c566bf9·...·]9-1">)</span><span·class="p">.</span><span·class="w">232 ····</span><span·class="nf">do</span><span·class="p"·data-group-id="8689613045-13">(</span><span·class="n">N</span><span·class="o">-</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8689613045-14">[</span><span·class="nc">rand</span><span·class="p">:</span><span·c[·...·truncated·by·diffoscope;·len:·715,·SHA:·4ba562b8cae614e2d10d9c63223e1de198d8b71f85359df916bc1673b9acd9f3·...·]9-1">)</span><span·class="p">.</span><span·class="w">
233 </span><span·class="p"·data-group-id="3544463359-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">sort</span><span·class="p"·data-group-id="3544463359-2">}</span><span·class="gp·unselectable">233 </span><span·class="p"·data-group-id="5642165939-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">sort</span><span·class="p"·data-group-id="5642165939-2">}</span><span·class="gp·unselectable">
234 2&gt;·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">seed</span><span·class="p"·data-group-id="3544463359-3">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="3544463359-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">234 2&gt;·</span><span·class="nc">rand</span><span·class="p">:</span><span·class="nf">seed</span><span·class="p"·data-group-id="5642165939-3">(</span><span·class="ss">default</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p"·data-group-id="5642165939-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
235 </span><span·class="ss">ok</span><span·class="p">.</span><span·class="gp·unselectable">235 </span><span·class="ss">ok</span><span·class="p">.</span><span·class="gp·unselectable">
236 3&gt;·</span><span·class="nc">sort</span><span·class="p">:</span><span·class="nf">do</span><span·class="p"·data-group-id="3544463359-4">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="3544463359-4">)</span><span·class="p">.</span><span·class="w">236 3&gt;·</span><span·class="nc">sort</span><span·class="p">:</span><span·class="nf">do</span><span·class="p"·data-group-id="5642165939-4">(</span><span·class="mi">1000</span><span·class="p"·data-group-id="5642165939-4">)</span><span·class="p">.</span><span·class="w">
237 </span><span·class="p"·data-group-id="3544463359-5">[</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</span><span·class="[·...·truncated·by·diffoscope;·len:·1299,·SHA:·6040f44b5fd6ab8f817d8881d1eb118de54453ccd163af9175053e0ac291ed4d·...·]9-5">]</span><span·class="gp·unselectable">237 </span><span·class="p"·data-group-id="5642165939-5">[</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">0</span><span·class="p">,</span><span·class="mi">1</span><span·class="p">,</span><span·class="mi">1</span><span·class="[·...·truncated·by·diffoscope;·len:·1299,·SHA:·e130c3297f33f48e05f3ffdee8a9f63f58929203e076cf3ff071b171b5a9611d·...·]9-5">]</span><span·class="gp·unselectable">
238 4&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="3544463359-6">(</span><span·class="p"·data-group-id="3544463359-6">)</span><span·class="p">.</span><span·class="w">238 4&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5642165939-6">(</span><span·class="p"·data-group-id="5642165939-6">)</span><span·class="p">.</span><span·class="w">
239 </span><span·class="p"·data-group-id="3544463359-7">{</span><span·class="mi">13180</span><span·class="p">,</span><span·class="w">239 </span><span·class="p"·data-group-id="5642165939-7">{</span><span·class="mi">13180</span><span·class="p">,</span><span·class="w">
240 ·</span><span·class="p"·data-group-id="3544463359-8">[</span><span·class="p"·data-group-id="3544463359-9">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="mi">6173</span><span·class="p">,</span><span·class="w">240 ·</span><span·class="p"·data-group-id="5642165939-8">[</span><span·class="p"·data-group-id="5642165939-9">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="mi">6173</span><span·class="p">,</span><span·class="w">
241 ·········</span><span·class="p"·data-group-id="3544463359-10">[</span><span·class="p"·data-group-id="3544463359-11">{</span><span·class="p"·data-group-id="3544463359-12">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_1</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·156,·SHA:·c116b0c8f8a963d62b9bdfa5248a3665dadc066b6180704524c18cd459efdacc·...·]9-11">}</span><span·class="p">,</span><span·class="w">241 ·········</span><span·class="p"·data-group-id="5642165939-10">[</span><span·class="p"·data-group-id="5642165939-11">{</span><span·class="p"·data-group-id="5642165939-12">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_1</span><span·class="p">,</span><span·class="mi[·...·truncated·by·diffoscope;·len:·156,·SHA:·0024c78304da3f3bc89a674257a05f9a2fb3f085529ed89ff468d7b9494fb63f·...·]9-11">}</span><span·class="p">,</span><span·class="w">
242 ··········</span><span·class="p"·data-group-id="3544463359-13">{</span><span·class="p"·data-group-id="3544463359-14">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_2</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359-14[·...·truncated·by·diffoscope;·len:·101,·SHA:·4d56ff99f01b76488bd3b5d7da9c956737720d66eb900a07c456e6d331d1f1b0·...·]9-13">}</span><span·class="p">,</span><span·class="w">242 ··········</span><span·class="p"·data-group-id="5642165939-13">{</span><span·class="p"·data-group-id="5642165939-14">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_2</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939-14[·...·truncated·by·diffoscope;·len:·101,·SHA:·0fb5da232ec21a1b03ca8f558512b44e38a6e14c43eb2821b2bc1dc3446706bc·...·]9-13">}</span><span·class="p">,</span><span·class="w">
243 ··········</span><span·class="p"·data-group-id="3544463359-15">{</span><span·class="p"·data-group-id="3544463359-16">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">split_1</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="3544463359-16">[·...·truncated·by·diffoscope;·len:·99,·SHA:·70a08cab43130df4a119a346a60b994747effce82ca5782f7d63eeec89fe52e1·...·]9-15">}</span><span·class="p">,</span><span·class="w">243 ··········</span><span·class="p"·data-group-id="5642165939-15">{</span><span·class="p"·data-group-id="5642165939-16">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">split_1</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="5642165939-16">[·...·truncated·by·diffoscope;·len:·99,·SHA:·3b1e16cdeba87184ce8c642a687caf17348e1dc7a1f03744a623745f4269de5a·...·]9-15">}</span><span·class="p">,</span><span·class="w">
244 ··········</span><span·class="p"·data-group-id="3544463359-17">{</span><span·class="p"·data-group-id="3544463359-18">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_1</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359-18"[·...·truncated·by·diffoscope;·len:·100,·SHA:·116ff9d599362594d85c2acd00b3ded6a232a8bc916802eb97ee4f14ee76b5dd·...·]9-17">}</span><span·class="p">,</span><span·class="w">244 ··········</span><span·class="p"·data-group-id="5642165939-17">{</span><span·class="p"·data-group-id="5642165939-18">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_1</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939-18"[·...·truncated·by·diffoscope;·len:·100,·SHA:·9edcf9d07dcbf855de4f5cc1a899d7a0ebf93fbe40fb6dd01365d86b7468808e·...·]9-17">}</span><span·class="p">,</span><span·class="w">
245 ··········</span><span·class="p"·data-group-id="3544463359-19">{</span><span·class="p"·data-group-id="3544463359-20">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_2</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359-20"[·...·truncated·by·diffoscope;·len:·100,·SHA:·c371028c81e8f171b2782bf2a8e13232e799da0575672ba8a1d5ee8cbfd274dc·...·]9-19">}</span><span·class="p">,</span><span·class="w">245 ··········</span><span·class="p"·data-group-id="5642165939-19">{</span><span·class="p"·data-group-id="5642165939-20">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_2</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939-20"[·...·truncated·by·diffoscope;·len:·100,·SHA:·10f843b86a0e6e1cb6c625698b899094f123be21dacd81e7e6a66eff01ea5aa8·...·]9-19">}</span><span·class="p">,</span><span·class="w">
246 ··········</span><span·class="p"·data-group-id="3544463359-21">{</span><span·class="p"·data-group-id="3544463359-22">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_12_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359[·...·truncated·by·diffoscope;·len:·104,·SHA:·1d524c8c79aecf730acab5b1ea9efc5f5ed26c70bd59ffe01c5f5d1119a7499b·...·]9-21">}</span><span·class="p">,</span><span·class="w">246 ··········</span><span·class="p"·data-group-id="5642165939-21">{</span><span·class="p"·data-group-id="5642165939-22">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_12_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939[·...·truncated·by·diffoscope;·len:·104,·SHA:·26ae9d95719b7000890e210ce7aea16bf809b170556e754154cb973713f797c1·...·]9-21">}</span><span·class="p">,</span><span·class="w">
247 ··········</span><span·class="p"·data-group-id="3544463359-23">{</span><span·class="p"·data-group-id="3544463359-24">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">split_1_1</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359-24[·...·truncated·by·diffoscope;·len:·101,·SHA:·ef4097a517b41c21e44a86f6851220b3264a2d38870e4def5c2aaea6d02875c9·...·]9-23">}</span><span·class="p">,</span><span·class="w">247 ··········</span><span·class="p"·data-group-id="5642165939-23">{</span><span·class="p"·data-group-id="5642165939-24">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">split_1_1</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939-24[·...·truncated·by·diffoscope;·len:·101,·SHA:·3b6b39ea4c7d0aca2a6024685c31113fd5318fe4376e26c47ea4521222c0b356·...·]9-23">}</span><span·class="p">,</span><span·class="w">
248 ··········</span><span·class="p"·data-group-id="3544463359-25">{</span><span·class="p"·data-group-id="3544463359-26">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_12_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359-[·...·truncated·by·diffoscope;·len:·103,·SHA:·9c308e82843f3c570be017ee1430084e6f4cd3c3ec42b0abae71462159fa7e97·...·]9-25">}</span><span·class="p">,</span><span·class="w">248 ··········</span><span·class="p"·data-group-id="5642165939-25">{</span><span·class="p"·data-group-id="5642165939-26">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_12_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939-[·...·truncated·by·diffoscope;·len:·103,·SHA:·e6036e0af780f85ae646777b9635ecba7ccb9422bebdf824abcdf6662d19973e·...·]9-25">}</span><span·class="p">,</span><span·class="w">
249 ··········</span><span·class="p"·data-group-id="3544463359-27">{</span><span·class="p"·data-group-id="3544463359-28">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_21_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359[·...·truncated·by·diffoscope;·len:·104,·SHA:·2f43eb0e5a301fffbdb6ee7e4de410f747c7dff5f35e923930df0e14a7350d10·...·]9-27">}</span><span·class="p">,</span><span·class="w">249 ··········</span><span·class="p"·data-group-id="5642165939-27">{</span><span·class="p"·data-group-id="5642165939-28">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge3_21_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939[·...·truncated·by·diffoscope;·len:·104,·SHA:·1e2435dea6d69fa72f78b25504d8b42e00a2b8fc933435e6f351c16569fbbda8·...·]9-27">}</span><span·class="p">,</span><span·class="w">
250 ··········</span><span·class="p"·data-group-id="3544463359-29">{</span><span·class="p"·data-group-id="3544463359-30">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_21_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="3544463359-[·...·truncated·by·diffoscope;·len:·103,·SHA:·824e8b4925852ff24d91469e1d17e627426017729ea695fa07adca0a38a0dcff·...·]9-29">}</span><span·class="p">,</span><span·class="w">250 ··········</span><span·class="p"·data-group-id="5642165939-29">{</span><span·class="p"·data-group-id="5642165939-30">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge3_21_3</span><span·class="p">,</span><span·class="mi">6</span><span·class="p"·data-group-id="5642165939-[·...·truncated·by·diffoscope;·len:·103,·SHA:·131fb3214462c9610f68dd135312753b9d7f77bd570c3921c3d6078c49faed63·...·]9-29">}</span><span·class="p">,</span><span·class="w">
251 ··········</span><span·class="p"·data-group-id="3544463359-31">{</span><span·class="p"·data-group-id="3544463359-32">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge2_1</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="3544463359-32"[·...·truncated·by·diffoscope;·len:·100,·SHA:·7dabb08c3db96d7b4185839af61cd48450f1f86255ece75835134e78ff2127c2·...·]9-31">}</span><span·class="p">,</span><span·class="w">251 ··········</span><span·class="p"·data-group-id="5642165939-31">{</span><span·class="p"·data-group-id="5642165939-32">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge2_1</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5642165939-32"[·...·truncated·by·diffoscope;·len:·100,·SHA:·77572bda6a8c748ead861285b4753d7acd37292aff0384a7a3fa4a01fae100d4·...·]9-31">}</span><span·class="p">,</span><span·class="w">
252 ··········</span><span·class="p"·data-group-id="3544463359-33">{</span><span·class="p"·data-group-id="3544463359-34">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge2_2</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="3544463359-34"[·...·truncated·by·diffoscope;·len:·100,·SHA:·30193fbd494f1b7f5bca6a8649749a2fc0341440d76394669a653c5c7145ca25·...·]9-33">}</span><span·class="p">,</span><span·class="w">252 ··········</span><span·class="p"·data-group-id="5642165939-33">{</span><span·class="p"·data-group-id="5642165939-34">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">merge2_2</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="5642165939-34"[·...·truncated·by·diffoscope;·len:·100,·SHA:·63d5452d61aeab7cc46af0db2154413f460efadcddf6884f1cb0eea870dcce62·...·]9-33">}</span><span·class="p">,</span><span·class="w">
253 ··········</span><span·class="p"·data-group-id="3544463359-35">{</span><span·class="p"·data-group-id="3544463359-36">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">reverse</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3544463359-36">[·...·truncated·by·diffoscope;·len:·99,·SHA:·51f0516c0547d1b1afc8eb43b3f35e327738ece2383d1ceb62e991504860ecb5·...·]9-35">}</span><span·class="p">,</span><span·class="w">253 ··········</span><span·class="p"·data-group-id="5642165939-35">{</span><span·class="p"·data-group-id="5642165939-36">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">reverse</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5642165939-36">[·...·truncated·by·diffoscope;·len:·99,·SHA:·72f9877909630c07364b8ce0057e26395f09fa7c3128b2bafd9ca03af2ef35f8·...·]9-35">}</span><span·class="p">,</span><span·class="w">
254 ··········</span><span·class="p"·data-group-id="3544463359-37">{</span><span·class="p"·data-group-id="3544463359-38">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge2_2</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="3544463359-38[·...·truncated·by·diffoscope;·len:·100,·SHA:·c961199740f53bcdd1c682a30b757395af9c4cc2a12880d26261e9c6ea0b83dc·...·]9-37">}</span><span·class="p">,</span><span·class="w">254 ··········</span><span·class="p"·data-group-id="5642165939-37">{</span><span·class="p"·data-group-id="5642165939-38">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge2_2</span><span·class="p">,</span><span·class="mi">5</span><span·class="p"·data-group-id="5642165939-38[·...·truncated·by·diffoscope;·len:·100,·SHA:·05e7b44a14ebbdca2285702452eef65b427baf0901c733bffca7f4beb1cb1fa5·...·]9-37">}</span><span·class="p">,</span><span·class="w">
255 ··········</span><span·class="p"·data-group-id="3544463359-39">{</span><span·class="p"·data-group-id="3544463359-40">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmergel</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3544463359-40">[·...·truncated·by·diffoscope;·len:·98,·SHA:·e470a5b3ef1a43777f545fe9148d3f3c14468ae4f8a46c370e5b9798e3921bf0·...·]9-39">}</span><span·class="p">,</span><span·class="w">255 ··········</span><span·class="p"·data-group-id="5642165939-39">{</span><span·class="p"·data-group-id="5642165939-40">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmergel</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5642165939-40">[·...·truncated·by·diffoscope;·len:·98,·SHA:·be5b6f66f505bb16be17687fea233035bb1ef0c62b85797e13c33ce181f78968·...·]9-39">}</span><span·class="p">,</span><span·class="w">
256 ··········</span><span·class="p"·data-group-id="3544463359-41">{</span><span·class="p"·data-group-id="3544463359-42">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge2_1</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="3544463359-42[·...·truncated·by·diffoscope;·len:·100,·SHA:·9ea235ef2cf69bfa445521345e2238970fde556aaa74fcc04fa5f79df11d1baf·...·]9-41">}</span><span·class="p">,</span><span·class="w">256 ··········</span><span·class="p"·data-group-id="5642165939-41">{</span><span·class="p"·data-group-id="5642165939-42">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">rmerge2_1</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="5642165939-42[·...·truncated·by·diffoscope;·len:·100,·SHA:·afe4d22587d6daa79348e2a63f53b9f7aa51d9859251719bee636269dc70e5be·...·]9-41">}</span><span·class="p">,</span><span·class="w">
257 ··········</span><span·class="p"·data-group-id="3544463359-43">{</span><span·class="p"·data-group-id="3544463359-44">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">mergel</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3544463359-44">}[·...·truncated·by·diffoscope;·len:·97,·SHA:·84df8fa80e091a6a16b4968c9dd1db531bfd60b06397cdc639e6a3e1511ab14e·...·]9-43">}</span><span·class="p">,</span><span·class="w">257 ··········</span><span·class="p"·data-group-id="5642165939-43">{</span><span·class="p"·data-group-id="5642165939-44">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">mergel</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5642165939-44">}[·...·truncated·by·diffoscope;·len:·97,·SHA:·3d9ae87930c8a296a55da516044beb06a576312e6c687cce40176033f229f65b·...·]9-43">}</span><span·class="p">,</span><span·class="w">
258 ··········</span><span·class="p"·data-group-id="3544463359-45">{</span><span·class="p"·data-group-id="3544463359-46">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">keyfind</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="3544463359-46">[·...·truncated·by·diffoscope;·len:·97,·SHA:·47c6dc3035930dc5be7cf42b1f4691db139efbf2a51d13b5df8b7e77bf600c5e·...·]9-45">}</span><span·class="p">,</span><span·class="w">258 ··········</span><span·class="p"·data-group-id="5642165939-45">{</span><span·class="p"·data-group-id="5642165939-46">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">keyfind</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="5642165939-46">[·...·truncated·by·diffoscope;·len:·97,·SHA:·dfc2a14111a61b823675161071082e9eafc258e7f9868445c821ce84064e2cd5·...·]9-45">}</span><span·class="p">,</span><span·class="w">
259 ··········</span><span·class="p"·data-group-id="3544463359-47">{</span><span·class="p"·data-group-id="3544463359-48">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">sort</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="3544463359-48">}</[·...·truncated·by·diffoscope;·len:·202,·SHA:·1b38d1100a7f42284a1422dd03b702a46f0b1b8ed635d01404740731d8bb16e6·...·]9-9">}</span><span·class="p">,</span><span·class="w">259 ··········</span><span·class="p"·data-group-id="5642165939-47">{</span><span·class="p"·data-group-id="5642165939-48">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">sort</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5642165939-48">}</[·...·truncated·by·diffoscope;·len:·202,·SHA:·2db3d6665855095b2fde98763d46e22fc3dc33b967775430f53e65f0cfc0b25e·...·]9-9">}</span><span·class="p">,</span><span·class="w">
260 ··</span><span·class="p"·data-group-id="3544463359-49">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="mi">5000</span><span·class="p">,</span><span·class="w">260 ··</span><span·class="p"·data-group-id="5642165939-49">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="mi">5000</span><span·class="p">,</span><span·class="w">
261 ········</span><span·class="p"·data-group-id="3544463359-50">[</span><span·class="p"·data-group-id="3544463359-51">{</span><span·class="p"·data-group-id="3544463359-52">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">uniform_s</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·155,·SHA:·c03cdb708755ba23209cfd8bd56a46c54575e0d99ef210cce0fc4f722ec53a66·...·]9-51">}</span><span·class="p">,</span><span·class="w">261 ········</span><span·class="p"·data-group-id="5642165939-50">[</span><span·class="p"·data-group-id="5642165939-51">{</span><span·class="p"·data-group-id="5642165939-52">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">uniform_s</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·155,·SHA:·fd4c9dfd4189574143897ab2d2a64a041425e8099fb648d463b463ddc91c6c95·...·]9-51">}</span><span·class="p">,</span><span·class="w">
262 ·········</span><span·class="p"·data-group-id="3544463359-53">{</span><span·class="p"·data-group-id="3544463359-54">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">uniform</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="3544463359-54">}[·...·truncated·by·diffoscope;·len:·99,·SHA:·2175989b0c5f8f133a300ae3eeb60b5c7c248883aea1d2dfcdaf10264c35bccd·...·]9-53">}</span><span·class="p">,</span><span·class="w">262 ·········</span><span·class="p"·data-group-id="5642165939-53">{</span><span·class="p"·data-group-id="5642165939-54">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">uniform</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5642165939-54">}[·...·truncated·by·diffoscope;·len:·99,·SHA:·ca4b1ceb9856e497371daaf47fe22b2af4b42c63828b2f4cdfe059b3e36b59af·...·]9-53">}</span><span·class="p">,</span><span·class="w">
263 ·········</span><span·class="p"·data-group-id="3544463359-55">{</span><span·class="p"·data-group-id="3544463359-56">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">seed_put</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="3544463359-56">[·...·truncated·by·diffoscope;·len:·100,·SHA:·c906583ec8fdc3ca47115e1e4d7f336bb0b1b84f54c9ca77552fb2b4654b11ad·...·]9-55">}</span><span·class="p">,</span><span·class="w">263 ·········</span><span·class="p"·data-group-id="5642165939-55">{</span><span·class="p"·data-group-id="5642165939-56">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">seed_put</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="5642165939-56">[·...·truncated·by·diffoscope;·len:·100,·SHA:·ef47bebbad8d2ebf651a86e0e2b60eda714efb5f548489bea7ebf943641d5d47·...·]9-55">}</span><span·class="p">,</span><span·class="w">
264 ·········</span><span·class="p"·data-group-id="3544463359-57">{</span><span·class="p"·data-group-id="3544463359-58">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">seed_get</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="3544463359-58">[·...·truncated·by·diffoscope;·len:·100,·SHA:·c906583ec8fdc3ca47115e1e4d7f336bb0b1b84f54c9ca77552fb2b4654b11ad·...·]9-57">}</span><span·class="p">,</span><span·class="w">264 ·········</span><span·class="p"·data-group-id="5642165939-57">{</span><span·class="p"·data-group-id="5642165939-58">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">seed_get</span><span·class="p">,</span><span·class="mi">0</span><span·class="p"·data-group-id="5642165939-58">[·...·truncated·by·diffoscope;·len:·100,·SHA:·ef47bebbad8d2ebf651a86e0e2b60eda714efb5f548489bea7ebf943641d5d47·...·]9-57">}</span><span·class="p">,</span><span·class="w">
265 ·········</span><span·class="p"·data-group-id="3544463359-59">{</span><span·class="p"·data-group-id="3544463359-60">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">exsss_uniform</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3544463359[·...·truncated·by·diffoscope;·len:·213,·SHA:·b38c3b6272c5e556e7fd1bd7d12f3f8774b5b623a72806dd967ecc321c8e7dbf·...·]9-49">}</span><span·class="p">,</span><span·class="w">265 ·········</span><span·class="p"·data-group-id="5642165939-59">{</span><span·class="p"·data-group-id="5642165939-60">{</span><span·class="ss">rand</span><span·class="p">,</span><span·class="ss">exsss_uniform</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5642165939[·...·truncated·by·diffoscope;·len:·213,·SHA:·6d964f3a7f51e821919dee2a8da1ef779bce581ee93063607079849bf7522cbc·...·]9-49">}</span><span·class="p">,</span><span·class="w">
266 ··</span><span·class="p"·data-group-id="3544463359-61">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="mi">1004</span><span·class="p">,</span><span·class="w">266 ··</span><span·class="p"·data-group-id="5642165939-61">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="mi">1004</span><span·class="p">,</span><span·class="w">
267 ··········</span><span·class="p"·data-group-id="3544463359-62">[</span><span·class="p"·data-group-id="3544463359-63">{</span><span·class="p"·data-group-id="3544463359-64">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">put</span><span·class="p">,</span><span·class="mi">2</[·...·truncated·by·diffoscope;·len:·151,·SHA:·d95079fe0d371b2357b3023914f90cafdd471766e05a90096df70220b066ca9b·...·]9-63">}</span><span·class="p">,</span><span·class="w">267 ··········</span><span·class="p"·data-group-id="5642165939-62">[</span><span·class="p"·data-group-id="5642165939-63">{</span><span·class="p"·data-group-id="5642165939-64">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">put</span><span·class="p">,</span><span·class="mi">2</[·...·truncated·by·diffoscope;·len:·151,·SHA:·44ab360de4d92c33827c4dc46783009f9237ca806fe4cccd8b5c96ef9079b127·...·]9-63">}</span><span·class="p">,</span><span·class="w">
268 ···········</span><span·class="p"·data-group-id="3544463359-65">{</span><span·class="p"·data-group-id="3544463359-66">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">trace_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="35444633[·...·truncated·by·diffoscope;·len:·104,·SHA:·4987251f98de4a6d3f0e48c764f57d9fa2ff577d0d7a6550cf2880e3a40a3db4·...·]9-65">}</span><span·class="p">,</span><span·class="w">268 ···········</span><span·class="p"·data-group-id="5642165939-65">{</span><span·class="p"·data-group-id="5642165939-66">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">trace_pattern</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="56421659[·...·truncated·by·diffoscope;·len:·104,·SHA:·601023635740ad4d7e3e7a86c1e369cfba45d83cd728b7471074816f74b1b210·...·]9-65">}</span><span·class="p">,</span><span·class="w">
269 ···········</span><span·class="p"·data-group-id="3544463359-67">{</span><span·class="p"·data-group-id="3544463359-68">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="ss">ensure_tracer_module_loaded</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3544463359-68">}</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="3544463359-67">}</span><span·class="p"·data-group-id="3544463359-62">]</span><span·class="p"·data-group-id="3544463359-61">}</span><span·class="p">,</span><span·class="w"> 
270 ··</span><span·class="p"·data-group-id="3544463359-69">{</span><span·class="ss">sort</span><span·class="p">,</span><span·class="mi">1001</span><span·class="p">,</span><span·class="p"·data-group-id="3544463359-70">[</span><span·class="p"·data-group-id="354446[·...·truncated·by·diffoscope;·len:·456,·SHA:·7ea9fc86e554e6fecfc0c00de49831c5a3282d88b8aaea1b2d4a7164f1141f85·...·]">}</span><span·class="p">,</span><span·class="w">269 ···········</span><span·class="p"·data-group-id="5642165939-67">{</span><span·class="p"·data-group-id="5642165939-68">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="ss">ensure_tracer_module_loaded</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·277,·SHA:·2213e206b0e80a50e0854a0c14f9e164bf55c591a6d7a4f8cff30e28803a2bd7·...·]">}</span><span·class="p">,</span><span·class="w">
 270 ··</span><span·class="p"·data-group-id="5642165939-69">{</span><span·class="ss">sort</span><span·class="p">,</span><span·class="mi">1001</span><span·class="p">,</span><span·class="p"·data-group-id="5642165939-70">[</span><span·class="p"·data-group-id="5642165939-71">{</span><span·class="p"·data-group-id="5642165939-72">{</span><span·class="ss">sort</span><span·class="p">,</span><span·class="ss">do</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="5642165939-72">}</span><span·class="p">,</span><span·class="mi">1001</span><span·class="p"·data-group-id="5642165939-71">}</span><span·class="p"·data-group-id="5642165939-70">]</span><span·class="p"·data-group-id="5642165939-69">}</span><span·class="p">,</span><span·class="w">
271 ··</span><span·class="p"·data-group-id="3544463359-73">{</span><span·class="ss">erts_internal</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="p"·data-group-id="3544463359-74">[</span><span·class="p"·data-group-id="3544463359-75">{</span><span·class="p"[·...·truncated·by·diffoscope;·len:·544,·SHA:·31e07d8308e50c7c143316d5303334a548743a3292b9e95e5003e73745e9b7d5·...·]9-7">}</span><span·class="gp·unselectable">271 ··</span><span·class="p"·data-group-id="5642165939-73">{</span><span·class="ss">erts_internal</span><span·class="p">,</span><span·class="mi">2</span><span·class="p">,</span><span·class="p"·data-group-id="5642165939-74">[</span><span·class="p"·data-group-id="5642165939-75">{</span><span·class="p"[·...·truncated·by·diffoscope;·len:·544,·SHA:·a36a83ac04edd20ae18bde28054f1bb5da1cc93c9997d534d740ae91f572f24a·...·]9-7">}</span><span·class="gp·unselectable">
272 5&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="3544463359-77">(</span><span·class="p"·data-group-id="3544463359-77">)</span><span·class="p">.</span><span·class="w">272 5&gt;·</span><span·class="nc">cprof</span><span·class="p">:</span><span·class="nf">stop</span><span·class="p"·data-group-id="5642165939-77">(</span><span·class="p"·data-group-id="5642165939-77">)</span><span·class="p">.</span><span·class="w">
273 </span><span·class="mi">12625</span></code></pre><p>The·example·shows·some·details·of·how·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#sort/1"><code·class="inline">lists:sort/1</code></a>·works.·It·used·6173273 </span><span·class="mi">12625</span></code></pre><p>The·example·shows·some·details·of·how·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#sort/1"><code·class="inline">lists:sort/1</code></a>·works.·It·used·6173
274 function·calls·in·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html"><code·class="inline">lists</code></a>·to·complete·the·work.</p><p>This·time,·since·the·shell·was·not·involved·in·starting·and·stopping·<code·class="inline">cprof</code>,·no274 function·calls·in·module·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html"><code·class="inline">lists</code></a>·to·complete·the·work.</p><p>This·time,·since·the·shell·was·not·involved·in·starting·and·stopping·<code·class="inline">cprof</code>,·no
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971 ······<p·class="built-using">971 ······<p·class="built-using">
972 ········Built·using972 ········Built·using
973 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the973 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
974 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>974 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
975 ······</p>975 ······</p>
976 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>976 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
977 ····</footer>977 ····</footer>
978 ··</div>978 ··</div>
979 </main>979 </main>
980 </div>980 </div>
981 <script>981 <script>
982 ··function·mermaidLoaded()·{982 ··function·mermaidLoaded()·{
983 ····mermaid.initialize({983 ····mermaid.initialize({
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207 ····<i·class="ri-link-m"·aria-hidden="true"></i>207 ····<i·class="ri-link-m"·aria-hidden="true"></i>
208 ··</a>208 ··</a>
209 ··<span·class="text">Edit·-·Alignment</span>209 ··<span·class="text">Edit·-·Alignment</span>
210 </h2>210 </h2>
211 <ul><li>··<em><code·class="inline">C-c·C-a</code></em>·(<code·class="inline">align-current</code>)·-·aligns·comments,·arrows,·assignments,211 <ul><li>··<em><code·class="inline">C-c·C-a</code></em>·(<code·class="inline">align-current</code>)·-·aligns·comments,·arrows,·assignments,
212 and·type·annotations·around·the·cursor.</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Example</span><span·class="p">:</span><span·class="w">212 and·type·annotations·around·the·cursor.</li></ul><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Example</span><span·class="p">:</span><span·class="w">
  
213 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="0033383452-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-2">(</span><[·...·truncated·by·diffoscope;·len:·137,·SHA:·1af466fd03f01b44fb83bd03a21def8c52955d31d0ee8c5ef19ffa1d85d0c0e9·...·]-2">)</span><span·class="p">.</span><span·class="w">213 </span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-1">(</span><span·class="n">L</span><span·class="p"·data-group-id="7315011910-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-2">(</span><[·...·truncated·by·diffoscope;·len:·137,·SHA:·b760d4dc45033235971947bb019699963fb119037ce7f4f38c23ab3257c50dd0·...·]-2">)</span><span·class="p">.</span><span·class="w">
214 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-3">(</span><span·class="p"·data-group-id="0033383452-4">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="0033383452-4">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·462,·SHA:·a0ab7370a515917b4ac4346d72cdb59244baa281e764a64a235c7188e004cad6·...·]-5">)</span><span·class="p">;</span><span·class="w">··</span><span·class="c1">%·recurse</span><span·class="w">214 </span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-3">(</span><span·class="p"·data-group-id="7315011910-4">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7315011910-4">]</span><span·class="p">,</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·462,·SHA:·e01a3a06ecf5ecc602c9eecec90ed1397aed03d9c91a87b56f95b9cdd76fb90c·...·]-5">)</span><span·class="p">;</span><span·class="w">··</span><span·class="c1">%·recurse</span><span·class="w">
215 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-6">(</span><span·class="p"·data-group-id="0033383452-7">[</span><span·class="p"·data-group-id="0033383452-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="0033383452-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·base·case</span><span·class="w">215 </span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-6">(</span><span·class="p"·data-group-id="7315011910-7">[</span><span·class="p"·data-group-id="7315011910-7">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="7315011910-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%·base·case</span><span·class="w">
216 </span><span·class="w">216 </span><span·class="w">
217 </span><span·class="p">-</span><span·class="na">record</span><span·class="w">·</span><span·class="p"·data-group-id="0033383452-8">{</span><span·class="w">·</span><span·class="ss">two</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="0033383452-9">(</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·a6e8ba06f76d8d593506f6c6d1af321bcc6cb925efb45dd8d0a32967d772cf3b·...·]-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·hello</span><span·class="w">217 </span><span·class="p">-</span><span·class="na">record</span><span·class="w">·</span><span·class="p"·data-group-id="7315011910-8">{</span><span·class="w">·</span><span·class="ss">two</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="7315011910-9">(</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·5aaf5922c38a7ace96cbebe112780181bc60a229c49601aa7a21de31a4fc8dd5·...·]-9">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·hello</span><span·class="w">
218 ··········</span><span·class="ss">three</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0033383452-10">(</span><span·class="p"·data-group-id="0033383452-10">)</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%·there</span><span·class="w">218 ··········</span><span·class="ss">three</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="7315011910-10">(</span><span·class="p"·data-group-id="7315011910-10">)</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%·there</span><span·class="w">
219 ··········</span><span·class="ss">four</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="0033383452-11">(</span><span·class="p"·data-group-id="0033383452-11">)</span><span·class="w">·</span><span·class="p"·data-group-id="0033383452-8">}</span><span·class="p">.</span><span·class="w">219 ··········</span><span·class="ss">four</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="7315011910-11">(</span><span·class="p"·data-group-id="7315011910-11">)</span><span·class="w">·</span><span·class="p"·data-group-id="7315011910-8">}</span><span·class="p">.</span><span·class="w">
  
220 </span><span·class="nc">becomes</span><span·class="p">:</span><span·class="w">220 </span><span·class="nc">becomes</span><span·class="p">:</span><span·class="w">
  
221 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-12">(</span><span·class="n">L</span><span·class="p"·data-group-id="0033383452-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-13">(</spa[·...·truncated·by·diffoscope;·len:·140,·SHA:·94adb98aa46a3bc96eab4d0a1a8393b03ae3197385c51e323e872de6a32e34ac·...·]-13">)</span><span·class="p">.</span><span·class="w">221 </span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-12">(</span><span·class="n">L</span><span·class="p"·data-group-id="7315011910-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-13">(</spa[·...·truncated·by·diffoscope;·len:·140,·SHA:·d039c9948f0be4c6daa74a0aa81bfedf6451cfa8a3ac66df3c7695de73b0be47·...·]-13">)</span><span·class="p">.</span><span·class="w">
222 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-14">(</span><span·class="p"·data-group-id="0033383452-15">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="0033383452-15">]</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·467,·SHA:·98c6b451468bf44e20c900ec35337ce2d839921c124fc966283689c548d8e9fb·...·]-16">)</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·recurse</span><span·class="w">222 </span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-14">(</span><span·class="p"·data-group-id="7315011910-15">[</span><span·class="n">H</span><span·class="p">|</span><span·class="n">T</span><span·class="p"·data-group-id="7315011910-15">]</span><span·class="p">,</span><span·class="w">·</span><span[·...·truncated·by·diffoscope;·len:·467,·SHA:·f8dd3c1a2b9573afda8f5fae3f020f5a888e22455169c1926c07b4f30c2d8452·...·]-16">)</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·recurse</span><span·class="w">
223 </span><span·class="nf">sum</span><span·class="p"·data-group-id="0033383452-17">(</span><span·class="p"·data-group-id="0033383452-18">[</span><span·class="p"·data-group-id="0033383452-18">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="0033383452-17">)</span><span·class="w">····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p">.</span><span·class="w">·············</span><span·class="c1">%·base·case</span><span·class="w">223 </span><span·class="nf">sum</span><span·class="p"·data-group-id="7315011910-17">(</span><span·class="p"·data-group-id="7315011910-18">[</span><span·class="p"·data-group-id="7315011910-18">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="7315011910-17">)</span><span·class="w">····</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p">.</span><span·class="w">·············</span><span·class="c1">%·base·case</span><span·class="w">
224 </span><span·class="w">224 </span><span·class="w">
225 </span><span·class="p">-</span><span·class="na">record</span><span·class="w">·</span><span·class="p"·data-group-id="0033383452-19">{</span><span·class="w">·</span><span·class="ss">two</span><span·class="w">···········</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="0033383452-20">(</[·...·truncated·by·diffoscope;·len:·46,·SHA:·8870a50b1d9cfc6912e5fade0c736b47a041f60da952295dc87a45ecf2305f6a·...·]-20">)</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%·hello</span><span·class="w">225 </span><span·class="p">-</span><span·class="na">record</span><span·class="w">·</span><span·class="p"·data-group-id="7315011910-19">{</span><span·class="w">·</span><span·class="ss">two</span><span·class="w">···········</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="7315011910-20">(</[·...·truncated·by·diffoscope;·len:·46,·SHA:·83700f338fac0d34aa0fe165794b3aab150c01c9bd1b8a43c03c464ca2af0bdb·...·]-20">)</span><span·class="p">,</span><span·class="w">····</span><span·class="c1">%·hello</span><span·class="w">
226 ··········</span><span·class="ss">three</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="0033383452-21">(</span><span·class="p"·data-group-id="0033383452-21">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·there</span><span·class="w">226 ··········</span><span·class="ss">three</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">hello</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">string</span><span·class="p"·data-group-id="7315011910-21">(</span><span·class="p"·data-group-id="7315011910-21">)</span><span·class="p">,</span><span·class="w">·</span><span·class="c1">%·there</span><span·class="w">
227 ··········</span><span·class="ss">four</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">····</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="0033383452-22">(</span><span·class="p"·data-group-id="0033383452-22">)</span><span·class="w">·</span><span·class="p"·data-group-id="0033383452-19">}</span><span·class="p">.</span></code></pre><h2·id="syntax-highlighting"·class="section-heading">227 ··········</span><span·class="ss">four</span><span·class="w">··</span><span·class="o">=</span><span·class="w">·</span><span·class="mi">42</span><span·class="w">····</span><span·class="p">:</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">int</span><span·class="p"·data-group-id="7315011910-22">(</span><span·class="p"·data-group-id="7315011910-22">)</span><span·class="w">·</span><span·class="p"·data-group-id="7315011910-19">}</span><span·class="p">.</span></code></pre><h2·id="syntax-highlighting"·class="section-heading">
228 ··<a·href="#syntax-highlighting"·class="hover-link">228 ··<a·href="#syntax-highlighting"·class="hover-link">
229 ····<i·class="ri-link-m"·aria-hidden="true"></i>229 ····<i·class="ri-link-m"·aria-hidden="true"></i>
230 ··</a>230 ··</a>
231 ··<span·class="text">Syntax·highlighting</span>231 ··<span·class="text">Syntax·highlighting</span>
232 </h2>232 </h2>
233 <p>The·syntax·highlighting·can·be·activated·from·the·Erlang·menu.·There·are·four233 <p>The·syntax·highlighting·can·be·activated·from·the·Erlang·menu.·There·are·four
234 different·alternatives:</p><ul><li>··Off:·Normal·black·and·white·display.</li><li>··Level·1:·Function·headers,·reserved·words,·comments,·strings,·quoted·atoms,234 different·alternatives:</p><ul><li>··Off:·Normal·black·and·white·display.</li><li>··Level·1:·Function·headers,·reserved·words,·comments,·strings,·quoted·atoms,
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351 ······<p·class="built-using">351 ······<p·class="built-using">
352 ········Built·using352 ········Built·using
353 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the353 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
354 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>354 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
355 ······</p>355 ······</p>
356 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>356 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
357 ····</footer>357 ····</footer>
358 ··</div>358 ··</div>
359 </main>359 </main>
360 </div>360 </div>
361 <script>361 <script>
362 ··function·mermaidLoaded()·{362 ··function·mermaidLoaded()·{
363 ····mermaid.initialize({363 ····mermaid.initialize({
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327 ······<p·class="built-using">327 ······<p·class="built-using">
328 ········Built·using328 ········Built·using
329 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the329 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
330 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>330 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
331 ······</p>331 ······</p>
332 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>332 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
333 ····</footer>333 ····</footer>
334 ··</div>334 ··</div>
335 </main>335 </main>
336 </div>336 </div>
337 <script>337 <script>
338 ··function·mermaidLoaded()·{338 ··function·mermaidLoaded()·{
339 ····mermaid.initialize({339 ····mermaid.initialize({
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171 </h2>171 </h2>
172 <p>This·section·describes·the·output·format·of·the·<a·href="#analyse/1"><code·class="inline">analyse/1</code></a>·function.</p><p>The·format·is·parsable·with·the·standard·Erlang·parsing·tools172 <p>This·section·describes·the·output·format·of·the·<a·href="#analyse/1"><code·class="inline">analyse/1</code></a>·function.</p><p>The·format·is·parsable·with·the·standard·Erlang·parsing·tools
173 <a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_scan.html"><code·class="inline">erl_scan</code></a>·and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_parse.html"><code·class="inline">erl_parse</code></a>,·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#consult/1"><code·class="inline">file:consult/1</code></a>,·or·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#read/2"><code·class="inline">io:read/2</code></a>.·The173 <a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_scan.html"><code·class="inline">erl_scan</code></a>·and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/erl_parse.html"><code·class="inline">erl_parse</code></a>,·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#consult/1"><code·class="inline">file:consult/1</code></a>,·or·<a·href="../../../../lib/stdlib-6.2.2/doc/html/io.html#read/2"><code·class="inline">io:read/2</code></a>.·The
174 parse·format·is·not·described·here··it·should·be·easy·enough·for·the174 parse·format·is·not·described·here··it·should·be·easy·enough·for·the
175 interested·reader·to·try·it·out.·Note·that·some·flags·to175 interested·reader·to·try·it·out.·Note·that·some·flags·to
176 <a·href="#analyse/1"><code·class="inline">analyse/1</code></a>·will·affect·the·format.</p><p>The·following·example·was·run·on·Erlang/OTP·R8·on·Solaris·8;·all·OTP176 <a·href="#analyse/1"><code·class="inline">analyse/1</code></a>·will·affect·the·format.</p><p>The·following·example·was·run·on·Erlang/OTP·R8·on·Solaris·8;·all·OTP
177 internals·in·this·example·are·version·dependent.</p><p>As·an·example,·we·will·use·the·following·function,·which·is·a177 internals·in·this·example·are·version·dependent.</p><p>As·an·example,·we·will·use·the·following·function,·which·is·a
178 slightly·modified·benchmark·function·from·module·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5883486612-1">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="5883486612-1">)</span><span·class="p">.</span><span·class="w">178 slightly·modified·benchmark·function·from·module·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html"><code·class="inline">file</code></a>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="1762126267-1">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="1762126267-1">)</span><span·class="p">.</span><span·class="w">
179 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5883486612-2">(</span><span·class="p"·data-group-id="5883486612-3">[</span><span·class="ss">create_file_slow</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="5883486612-3">]</span><span·class="p"·data-group-id="58834866[·...·truncated·by·diffoscope;·len:·2,·SHA:·6b51d431df5d7f141cbececcf79edf3dd861c3b4069f0b11661a3eefacbba918·...·]-2">)</span><span·class="p">.</span><span·class="w">179 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="1762126267-2">(</span><span·class="p"·data-group-id="1762126267-3">[</span><span·class="ss">create_file_slow</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="1762126267-3">]</span><span·class="p"·data-group-id="17621262[·...·truncated·by·diffoscope;·len:·2,·SHA:·49d180ecf56132819571bf39d9b7b342522a2ac6d23c1418d3338251bfe469c8·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
180 </span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="5883486612-4">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="5883486612-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·145,·SHA:·3d14c730a826ce3aa79500f6e1b7d331af02ce020b9b1a4ccf16b0be59561065·...·]-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">180 </span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="1762126267-4">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="1762126267-4">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·145,·SHA:·4784239258110fdba0d30e9d945b9b82560142cd34f8b3ba2a94ffa6f9225597·...·]-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;=</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
181 ····</span><span·class="p"·data-group-id="5883486612-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FD</span><span·class="p"·data-group-id="5883486612-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">181 ····</span><span·class="p"·data-group-id="1762126267-6">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FD</span><span·class="p"·data-group-id="1762126267-6">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
182 ········</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="5883486612-7">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5883486612-8">[</span><span·class="ss">raw</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">write</span><s[·...·truncated·by·diffoscope;·len:·255,·SHA:·55ab71ae84a3879219e34dfdab1e7a8cde0dc04e1eb205ea9a236fab50492721·...·]-7">)</span><span·class="p">,</span><span·class="w">182 ········</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">open</span><span·class="p"·data-group-id="1762126267-7">(</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1762126267-8">[</span><span·class="ss">raw</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">write</span><s[·...·truncated·by·diffoscope;·len:·255,·SHA:·10bacf60bbc597d7f60ac927d01fd8e9cbd07839e56b77492d0adc8ca58d9528·...·]-7">)</span><span·class="p">,</span><span·class="w">
183 ····</span><span·class="k">if</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">256</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">183 ····</span><span·class="k">if</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">&gt;</span><span·class="w">·</span><span·class="mi">256</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
184 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="5883486612-9">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">184 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="1762126267-9">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">
185 ····························</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="5883486612-10">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="5883486612-11">(</span><span·class="n">X</span><span·class="p"·data-group-id="5883486612-11">)</span><span·class="w">·</span><span·class="p">-&gt;</spa[·...·truncated·by·diffoscope;·len:·258,·SHA:·a986c05a7d0c5c2b897e955f23f506e1a1a897dc741eb0833c5d98ebbe5c9317·...·]-12">&gt;&gt;</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">185 ····························</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="1762126267-10">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="1762126267-11">(</span><span·class="n">X</span><span·class="p"·data-group-id="1762126267-11">)</span><span·class="w">·</span><span·class="p">-&gt;</spa[·...·truncated·by·diffoscope;·len:·258,·SHA:·eeac9cbe876873831f3e7e697292e3fbfcca6728a446832cc12203b132d1db3f·...·]-12">&gt;&gt;</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
186 ····························</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="5883486612-13">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">255</span><span·class="p"·data-group-id="5883486612-13">)</span><span·class="p"·data-group-id="5883486612-10">)</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·feca55c0a5624135c11806e676d036947d8f2b4924697f154cdf1885161f9790·...·]-9">)</span><span·class="p">,</span><span·class="w">186 ····························</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">seq</span><span·class="p"·data-group-id="1762126267-13">(</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">255</span><span·class="p"·data-group-id="1762126267-13">)</span><span·class="p"·data-group-id="1762126267-10">)</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·16,·SHA:·d925861919f8e81974bfd136f1e1a26c556c7686f5e51120c5eeb21ddcb98666·...·]-9">)</span><span·class="p">,</span><span·class="w">
187 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="5883486612-14">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">256</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="5883486612-14">)</span><span·class="p">;</span><span·class="w">187 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="1762126267-14">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">256</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="1762126267-14">)</span><span·class="p">;</span><span·class="w">
188 ·······</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">188 ·······</span><span·class="ss">true</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
189 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="5883486612-15">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="5883486612-15">)</span><span·class="w">189 ············</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="1762126267-15">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="1762126267-15">)</span><span·class="w">
190 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">190 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="5883486612-16">(</span><span·class="n">FD</span><span·class="p"·data-group-id="5883486612-16">)</span><span·class="p">.</span><span·class="w">191 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">close</span><span·class="p"·data-group-id="1762126267-16">(</span><span·class="n">FD</span><span·class="p"·data-group-id="1762126267-16">)</span><span·class="p">.</span><span·class="w">
  
192 </span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="5883486612-17">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="5883486612-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 </span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="1762126267-17">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p"·data-group-id="1762126267-17">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">193 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
194 </span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="5883486612-18">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="5883486612-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">194 </span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="1762126267-18">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="1762126267-18">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
195 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="5883486612-19">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5883486612-20">&lt;&lt;</span><span·class="n">M</span><span·class="p">:</span><span·class="mi">32</span><span·class="o">/</span><[·...·truncated·by·diffoscope;·len:·133,·SHA:·a082eda657fa6ba9416915b97ceb34942a06ec869d0cd546f82049dfd5481cea·...·]-19">)</span><span·class="p">,</span><span·class="w">195 ····</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">file</span><span·class="p">:</span><span·class="nf">write</span><span·class="p"·data-group-id="1762126267-19">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="1762126267-20">&lt;&lt;</span><span·class="n">M</span><span·class="p">:</span><span·class="mi">32</span><span·class="o">/</span><[·...·truncated·by·diffoscope;·len:·133,·SHA:·f222c615913908d05ba5268d2e652d537f6957c16102dad5635d729d7a661bf3·...·]-19">)</span><span·class="p">,</span><span·class="w">
196 ····</span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="5883486612-21">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"[·...·truncated·by·diffoscope;·len:·772,·SHA:·6b935f2580fd25d3b7623bb111a7cbc17d81ef159b37c7eb95ccee2fdb31aff2·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">196 ····</span><span·class="nf">create_file_slow</span><span·class="p"·data-group-id="1762126267-21">(</span><span·class="n">FD</span><span·class="p">,</span><span·class="w">·</span><span·class="n">M</span><span·class="o">+</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"[·...·truncated·by·diffoscope;·len:·772,·SHA:·6a698d095fb4751032f9ff47df4c6ecd364b1b712575a97860c25b9962adb71b·...·]-1">)</span><span·class="p">.</span><span·class="gp·unselectable">
197 2&gt;·</span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="5760931589-3">(</span><span·class="p"·data-group-id="5760931589-3">)</span><span·class="p">.</span><span·class="gp·unselectable">197 2&gt;·</span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="2538624815-3">(</span><span·class="p"·data-group-id="2538624815-3">)</span><span·class="p">.</span><span·class="gp·unselectable">
198 3&gt;·</span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="5760931589-4">(</span><span·class="p"·data-group-id="5760931589-4">)</span><span·class="p">.</span></code></pre><p>The·printout·starts·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Analysis·results:</span><span·class="w">198 3&gt;·</span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="2538624815-4">(</span><span·class="p"·data-group-id="2538624815-4">)</span><span·class="p">.</span></code></pre><p>The·printout·starts·with:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·Analysis·results:</span><span·class="w">
199 </span><span·class="p"·data-group-id="6806213252-1">{</span><span·class="w">··</span><span·class="ss">analysis_options</span><span·class="p">,</span><span·class="w">199 </span><span·class="p"·data-group-id="6782196241-1">{</span><span·class="w">··</span><span·class="ss">analysis_options</span><span·class="p">,</span><span·class="w">
200 ·</span><span·class="p"·data-group-id="6806213252-2">[</span><span·class="p"·data-group-id="6806213252-3">{</span><span·class="ss">callers</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6806213252-3">}</span><span·class="p">,</span><span·class="w">200 ·</span><span·class="p"·data-group-id="6782196241-2">[</span><span·class="p"·data-group-id="6782196241-3">{</span><span·class="ss">callers</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6782196241-3">}</span><span·class="p">,</span><span·class="w">
201 ··</span><span·class="p"·data-group-id="6806213252-4">{</span><span·class="ss">sort</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">acc</span><span·class="p"·data-group-id="6806213252-4">}</span><span·class="p">,</span><span·class="w">201 ··</span><span·class="p"·data-group-id="6782196241-4">{</span><span·class="ss">sort</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">acc</span><span·class="p"·data-group-id="6782196241-4">}</span><span·class="p">,</span><span·class="w">
202 ··</span><span·class="p"·data-group-id="6806213252-5">{</span><span·class="ss">totals</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6806213252-5">}</span><span·class="p">,</span><span·class="w">202 ··</span><span·class="p"·data-group-id="6782196241-5">{</span><span·class="ss">totals</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·class="p"·data-group-id="6782196241-5">}</span><span·class="p">,</span><span·class="w">
203 ··</span><span·class="p"·data-group-id="6806213252-6">{</span><span·class="ss">details</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6806213252-6">}</span><span·class="p"·data-group-id="6806213252-2">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·8441c69eefbcd0aa32ff27b67186baac74cf797c5163dfb54877ef5bb45d4105·...·]-1">}</span><span·class="p">.</span><span·class="w">203 ··</span><span·class="p"·data-group-id="6782196241-6">{</span><span·class="ss">details</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">true</span><span·class="p"·data-group-id="6782196241-6">}</span><span·class="p"·data-group-id="6782196241-2">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·2f5c90c208d4aa8cb0c661040add7059d8158b4645bcf0614c943470e6634d80·...·]-1">}</span><span·class="p">.</span><span·class="w">
  
204 </span><span·class="c1">%·······································CNT·······ACC·······OWN</span><span·class="w">204 </span><span·class="c1">%·······································CNT·······ACC·······OWN</span><span·class="w">
205 </span><span·class="p"·data-group-id="6806213252-7">[</span><span·class="p"·data-group-id="6806213252-8">{</span><span·class="w">·</span><span·class="ss">totals</span><span·class="p">,</span><span·class="w">·····························</span><span·class="mi">9627</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·230,·SHA:·7980da63e527d967ebf6a33bd49c1da63d28612b897e2e0dcbef65214a95c3da·...·]-7">]</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%%%</span></code></pre><p>The·<code·class="inline">CNT</code>·column·shows·the·total·number·of·function·calls·that·was·found·in·the205 </span><span·class="p"·data-group-id="6782196241-7">[</span><span·class="p"·data-group-id="6782196241-8">{</span><span·class="w">·</span><span·class="ss">totals</span><span·class="p">,</span><span·class="w">·····························</span><span·class="mi">9627</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·230,·SHA:·2100e3165e9f5043d56f3a043ef45b14bce6258ab6459ec389dbf2bba1c5b01c·...·]-7">]</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%%%</span></code></pre><p>The·<code·class="inline">CNT</code>·column·shows·the·total·number·of·function·calls·that·was·found·in·the
206 trace.·In·the·<code·class="inline">ACC</code>·column·is·the·total·time·of·the·trace·from·first·timestamp·to206 trace.·In·the·<code·class="inline">ACC</code>·column·is·the·total·time·of·the·trace·from·first·timestamp·to
207 last.·And·in·the·<code·class="inline">OWN</code>·column·is·the·sum·of·the·execution·time·in·functions·found207 last.·And·in·the·<code·class="inline">OWN</code>·column·is·the·sum·of·the·execution·time·in·functions·found
208 in·the·trace,·not·including·called·functions.·In·this·case·it·is·very·close·to208 in·the·trace,·not·including·called·functions.·In·this·case·it·is·very·close·to
209 the·<code·class="inline">ACC</code>·time·since·the·emulator·had·practically·nothing·to·do·except209 the·<code·class="inline">ACC</code>·time·since·the·emulator·had·practically·nothing·to·do·except
210 executing·our·test·program.</p><p>All·time·values·in·the·printout·are·in·milliseconds.</p><p>The·printout·continues:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·······································CNT·······ACC·······OWN</span><span·class="w">210 executing·our·test·program.</p><p>All·time·values·in·the·printout·are·in·milliseconds.</p><p>The·printout·continues:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%·······································CNT·······ACC·······OWN</span><span·class="w">
211 </span><span·class="p"·data-group-id="3149021725-1">[</span><span·class="p"·data-group-id="3149021725-2">{</span><span·class="w">·</span><span·class="s">&quot;&lt;0.28.0&gt;&quot;</span><span·class="p">,</span><span·class="w">·························</span><span·class="mi">9627</span><span·cl[·...·truncated·by·diffoscope;·len:·223,·SHA:·bf292d2ceb55598e69b97d6ff602e2a2554eb9be3a4e3f8b111a110c9943a1ce·...·]-1">]</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%%</span></code></pre><p>This·is·the·printout·header·of·one·process.·The·printout·contains·only·this·one211 </span><span·class="p"·data-group-id="8403959484-1">[</span><span·class="p"·data-group-id="8403959484-2">{</span><span·class="w">·</span><span·class="s">&quot;&lt;0.28.0&gt;&quot;</span><span·class="p">,</span><span·class="w">·························</span><span·class="mi">9627</span><span·cl[·...·truncated·by·diffoscope;·len:·223,·SHA:·7913091804b9665ad6b986be17bd819bd52cba88613a651a47e3f7f7b9e48df0·...·]-1">]</span><span·class="p">.</span><span·class="w">···</span><span·class="c1">%%</span></code></pre><p>This·is·the·printout·header·of·one·process.·The·printout·contains·only·this·one
212 process·since·we·called·<a·href="#apply/3"><code·class="inline">fprof:apply/3</code></a>·that·traces·only·the·current·process.212 process·since·we·called·<a·href="#apply/3"><code·class="inline">fprof:apply/3</code></a>·that·traces·only·the·current·process.
213 Therefore·the·<code·class="inline">CNT</code>·and·<code·class="inline">OWN</code>·columns·perfectly·matches·the·totals·above.·The·<code·class="inline">ACC</code>213 Therefore·the·<code·class="inline">CNT</code>·and·<code·class="inline">OWN</code>·columns·perfectly·matches·the·totals·above.·The·<code·class="inline">ACC</code>
214 column·is·undefined·since·summing·the·<code·class="inline">ACC</code>·times·of·all·calls·in·the·process214 column·is·undefined·since·summing·the·<code·class="inline">ACC</code>·times·of·all·calls·in·the·process
215 makes·no·sense··one·would·get·something·like·the·<code·class="inline">ACC</code>·value·from·totals·above215 makes·no·sense··one·would·get·something·like·the·<code·class="inline">ACC</code>·value·from·totals·above
216 multiplied·by·the·average·depth·of·the·call·stack.</p><p>All·paragraphs·up·to·the·next·process·header·only·concerns·function·calls·within216 multiplied·by·the·average·depth·of·the·call·stack.</p><p>All·paragraphs·up·to·the·next·process·header·only·concerns·function·calls·within
217 this·process.</p><p>Now·we·come·to·something·more·interesting:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4414096530-1">{</span><span·class="p"·data-group-id="4414096530-2">[</span><span·class="p"·data-group-id="4414096530-3">{</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="w">·····························</span><span·class="mi">0<[·...·truncated·by·diffoscope;·len:·260,·SHA:·da7d8e6865e82d22441645df9c4cfe3a56ad6cee75e16570dc7c020b50fd9ca8·...·]-2">]</span><span·class="p">,</span><span·class="w">217 this·process.</p><p>Now·we·come·to·something·more·interesting:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6164448587-1">{</span><span·class="p"·data-group-id="6164448587-2">[</span><span·class="p"·data-group-id="6164448587-3">{</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="w">·····························</span><span·class="mi">0<[·...·truncated·by·diffoscope;·len:·260,·SHA:·73c84a37c98750d0abe999ffecd8ed3da1baf498412d257c18b28e4fd9597842·...·]-2">]</span><span·class="p">,</span><span·class="w">
218 ·</span><span·class="p"·data-group-id="4414096530-4">{</span><span·class="w">·</span><span·class="p"·data-group-id="4414096530-5">{</span><span·class="ss">fprof</span><span·class="p">,</span><span·class="ss">apply_start_stop</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"[·...·truncated·by·diffoscope;·len:·323,·SHA:·86ebece7c98c8497c3fa7c06f4aed456fbf98cd475c632fb376547ca29df37ea·...·]-4">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">218 ·</span><span·class="p"·data-group-id="6164448587-4">{</span><span·class="w">·</span><span·class="p"·data-group-id="6164448587-5">{</span><span·class="ss">fprof</span><span·class="p">,</span><span·class="ss">apply_start_stop</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"[·...·truncated·by·diffoscope;·len:·323,·SHA:·451286950770e96d3ae450a544c3af5411d24209bbc67343af46418f0c8c9b51·...·]-4">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">
219 ·</span><span·class="p"·data-group-id="4414096530-6">[</span><span·class="p"·data-group-id="4414096530-7">{</span><span·class="p"·data-group-id="4414096530-8">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·352,·SHA:·d48f3d849eff3a4ed22726b9baea570ed0d7164de921fd57940d05171fe31402·...·]-7">}</span><span·class="p">,</span><span·class="w">219 ·</span><span·class="p"·data-group-id="6164448587-6">[</span><span·class="p"·data-group-id="6164448587-7">{</span><span·class="p"·data-group-id="6164448587-8">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·352,·SHA:·19965b26e27cd0776fa4908ab5ddb8fb48927c2cdb99dc8c7ef428166363048e·...·]-7">}</span><span·class="p">,</span><span·class="w">
220 ··</span><span·class="p"·data-group-id="4414096530-9">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">·······························</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">0.000</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·207,·SHA:·c712b5d09c300dddad5d08af0583ea57db129d0c24a4dbc45aceff9cebb4077c·...·]-1">}</span><span·class="p">.</span><span·class="w">220 ··</span><span·class="p"·data-group-id="6164448587-9">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">·······························</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">0.000</span><span·class="p">,</s[·...·truncated·by·diffoscope;·len:·207,·SHA:·c2908dc2c75a2aa6540aadaf05d5c3da004da64f18d6435fddd64b4460d502f6·...·]-1">}</span><span·class="p">.</span><span·class="w">
  
221 </span><span·class="p"·data-group-id="4414096530-10">{</span><span·class="p"·data-group-id="4414096530-11">[</span><span·class="p"·data-group-id="4414096530-12">{</span><span·class="p"·data-group-id="4414096530-13">{</span><span·class="ss">fprof</span><span·class="p">,</span><span·class="ss">a[·...·truncated·by·diffoscope;·len:·464,·SHA:·2a471a53ec42dc98cb33a3e72f4acbd4eee796912226a29712e2356a8c9f37bf·...·]-11">]</span><span·class="p">,</span><span·class="w">221 </span><span·class="p"·data-group-id="6164448587-10">{</span><span·class="p"·data-group-id="6164448587-11">[</span><span·class="p"·data-group-id="6164448587-12">{</span><span·class="p"·data-group-id="6164448587-13">{</span><span·class="ss">fprof</span><span·class="p">,</span><span·class="ss">a[·...·truncated·by·diffoscope;·len:·464,·SHA:·6b0e64d53add40c5b49c7627319ce884b28912c618b7c3a0b1e8929174b7283a·...·]-11">]</span><span·class="p">,</span><span·class="w">
222 ·</span><span·class="p"·data-group-id="4414096530-14">{</span><span·class="w">·</span><span·class="p"·data-group-id="4414096530-15">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"[·...·truncated·by·diffoscope;·len:·326,·SHA:·cbdfb063d20e6896aff386ed778bb82cdafcd03f8a63d37e87a5e2b693061574·...·]-14">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">222 ·</span><span·class="p"·data-group-id="6164448587-14">{</span><span·class="w">·</span><span·class="p"·data-group-id="6164448587-15">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"[·...·truncated·by·diffoscope;·len:·326,·SHA:·9d029d7baae3866e1dba87a0f052c1b582aa36c99912dba3b56c56db3e0ce884·...·]-14">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">
223 ·</span><span·class="p"·data-group-id="4414096530-16">[</span><span·class="p"·data-group-id="4414096530-17">{</span><span·class="p"·data-group-id="4414096530-18">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">close</span><span·class="p">,</span><span·class="mi">1</[·...·truncated·by·diffoscope;·len:·356,·SHA:·70a362c714e4204a9f870a1f3ba6ff115b6f633bcc4d5a1d570c5294ade04064·...·]-17">}</span><span·class="p">,</span><span·class="w">223 ·</span><span·class="p"·data-group-id="6164448587-16">[</span><span·class="p"·data-group-id="6164448587-17">{</span><span·class="p"·data-group-id="6164448587-18">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">close</span><span·class="p">,</span><span·class="mi">1</[·...·truncated·by·diffoscope;·len:·356,·SHA:·65ab1276ca9b1944be8aa26e4a66129f6e8815031c8d37a4b492d93e244dcb91·...·]-17">}</span><span·class="p">,</span><span·class="w">
224 ··</span><span·class="p"·data-group-id="4414096530-19">{</span><span·class="p"·data-group-id="4414096530-20">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="44140965[·...·truncated·by·diffoscope;·len:·302,·SHA:·5d2db34efdcc8aa214912cb02845d0ee349a4ab11c8bb622e79620ab5a4a501d·...·]-19">}</span><span·class="p">,</span><span·class="w">224 ··</span><span·class="p"·data-group-id="6164448587-19">{</span><span·class="p"·data-group-id="6164448587-20">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="61644485[·...·truncated·by·diffoscope;·len:·302,·SHA:·a393ab2d4fc82cbff9a9b6d002cb9dfbc0664fc4a43a9d4102ce2f1f8fa113c6·...·]-19">}</span><span·class="p">,</span><span·class="w">
225 ··</span><span·class="p"·data-group-id="4414096530-21">{</span><span·class="p"·data-group-id="4414096530-22">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">open</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="4414096530-22">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·4a59f4b3e82929d0e33e0f2800842f5da45e022cac1504e28cf0909631e9ada1·...·]-21">}</span><span·class="p">,</span><span·class="w">225 ··</span><span·class="p"·data-group-id="6164448587-21">{</span><span·class="p"·data-group-id="6164448587-22">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">open</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6164448587-22">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·f139718d5c4f2e1016c6e0eccd168449397b81ebd7529fb3f2a6753e7d07a96a·...·]-21">}</span><span·class="p">,</span><span·class="w">
226 ··</span><span·class="p"·data-group-id="4414096530-23">{</span><span·class="p"·data-group-id="4414096530-24">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">map</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="4414096530-24">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·f3d616f903a6ff287d6ed810e85acbb5a20b6eac0fe8639229976145d6041171·...·]-23">}</span><span·class="p">,</span><span·class="w">226 ··</span><span·class="p"·data-group-id="6164448587-23">{</span><span·class="p"·data-group-id="6164448587-24">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">map</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6164448587-24">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·aa139ded85339614ae948ed62e93096863199862ed02defc9f8fb685e3488efc·...·]-23">}</span><span·class="p">,</span><span·class="w">
227 ··</span><span·class="p"·data-group-id="4414096530-25">{</span><span·class="p"·data-group-id="4414096530-26">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">seq</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="4414096530-26">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·29e1c9d00c8df181fad26fa389c79896539c83fbcf7b6a64156beb9b82732f79·...·]-25">}</span><span·class="p">,</span><span·class="w">227 ··</span><span·class="p"·data-group-id="6164448587-25">{</span><span·class="p"·data-group-id="6164448587-26">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">seq</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6164448587-26">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·4a38974c907e714539950b40fd992cd0bea2f2bd40bb881ec4514d9d41e99ae0·...·]-25">}</span><span·class="p">,</span><span·class="w">
228 ··</span><span·class="p"·data-group-id="4414096530-27">{</span><span·class="p"·data-group-id="4414096530-28">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="4414096530-28">}</[·...·truncated·by·diffoscope;·len:·410,·SHA:·5a3e00cb2568fa98f883b7c7195d7e52a06376fd65dedf24963c733dbf9828e5·...·]-10">}</span><span·class="p">.</span></code></pre><p>The·printout·consists·of·one·paragraph·per·called·function.·The·function228 ··</span><span·class="p"·data-group-id="6164448587-27">{</span><span·class="p"·data-group-id="6164448587-28">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6164448587-28">}</[·...·truncated·by·diffoscope;·len:·410,·SHA:·1d10ecdbf72f5cf8097be6e0eec3a1e7e16cf5ff7008a9bf96cf9496755b2c87·...·]-10">}</span><span·class="p">.</span></code></pre><p>The·printout·consists·of·one·paragraph·per·called·function.·The·function
229 <em>marked</em>·with·<code·class="inline">%</code>·is·the·one·the·paragraph·concerns··<code·class="inline">foo:create_file_slow/2</code>.229 <em>marked</em>·with·<code·class="inline">%</code>·is·the·one·the·paragraph·concerns··<code·class="inline">foo:create_file_slow/2</code>.
230 Above·the·marked·function·are·the·<em>calling</em>·functions··those·that·has·called230 Above·the·marked·function·are·the·<em>calling</em>·functions··those·that·has·called
231 the·marked,·and·below·are·those·<em>called</em>·by·the·marked·function.</p><p>The·paragraphs·are·per·default·sorted·in·descending·order·of·the·<code·class="inline">ACC</code>·column·for231 the·marked,·and·below·are·those·<em>called</em>·by·the·marked·function.</p><p>The·paragraphs·are·per·default·sorted·in·descending·order·of·the·<code·class="inline">ACC</code>·column·for
232 the·marked·function.·The·calling·list·and·called·list·within·one·paragraph·are232 the·marked·function.·The·calling·list·and·called·list·within·one·paragraph·are
233 also·per·default·sorted·in·descending·order·of·their·<code·class="inline">ACC</code>·column.</p><p>The·columns·are:</p><ul><li><code·class="inline">CNT</code>·-·the·number·of·times·the·function·has·been·called</li><li><code·class="inline">ACC</code>·-·the·time·spent·in·the·function·including·called·functions</li><li><code·class="inline">OWN</code>·-·the·time·spent·in·the·function·not·including·called·functions</li></ul><p>The·rows·for·the·<em>calling</em>·functions·contain·statistics·for·the·<em>marked</em>233 also·per·default·sorted·in·descending·order·of·their·<code·class="inline">ACC</code>·column.</p><p>The·columns·are:</p><ul><li><code·class="inline">CNT</code>·-·the·number·of·times·the·function·has·been·called</li><li><code·class="inline">ACC</code>·-·the·time·spent·in·the·function·including·called·functions</li><li><code·class="inline">OWN</code>·-·the·time·spent·in·the·function·not·including·called·functions</li></ul><p>The·rows·for·the·<em>calling</em>·functions·contain·statistics·for·the·<em>marked</em>
234 function·with·the·constraint·that·only·the·occasions·when·a·call·was·made·from234 function·with·the·constraint·that·only·the·occasions·when·a·call·was·made·from
235 the·<em>row's</em>·function·to·the·<em>marked</em>·function·are·accounted·for.</p><p>The·row·for·the·<em>marked</em>·function·simply·contains·the·sum·of·all·<em>calling</em>·rows.</p><p>The·rows·for·the·<em>called</em>·functions·contains·statistics·for·the·<em>row's</em>·function235 the·<em>row's</em>·function·to·the·<em>marked</em>·function·are·accounted·for.</p><p>The·row·for·the·<em>marked</em>·function·simply·contains·the·sum·of·all·<em>calling</em>·rows.</p><p>The·rows·for·the·<em>called</em>·functions·contains·statistics·for·the·<em>row's</em>·function
Offset 242, 109 lines modifiedOffset 242, 109 lines modified
242 execution.·It·spent·most·of·its·time·in·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#close/1"><code·class="inline">file:close/1</code></a>.·The·function242 execution.·It·spent·most·of·its·time·in·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#close/1"><code·class="inline">file:close/1</code></a>.·The·function
243 <code·class="inline">foo:create_file_slow/3</code>·that·writes·3/4·of·the·file·contents·is·the·second243 <code·class="inline">foo:create_file_slow/3</code>·that·writes·3/4·of·the·file·contents·is·the·second
244 biggest·time·thief.</p><p>We·also·see·that·the·call·to·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>·that·writes·1/4·of·the·file·contents244 biggest·time·thief.</p><p>We·also·see·that·the·call·to·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>·that·writes·1/4·of·the·file·contents
245 takes·very·little·time·in·itself.·What·takes·time·is·to·build·the·data245 takes·very·little·time·in·itself.·What·takes·time·is·to·build·the·data
246 (<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#seq/2"><code·class="inline">lists:seq/2</code></a>·and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#map/2"><code·class="inline">lists:map/2</code></a>).</p><p>The·function·<code·class="inline">undefined</code>·that·has·called·<code·class="inline">fprof:apply_start_stop/4</code>·is·an246 (<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#seq/2"><code·class="inline">lists:seq/2</code></a>·and·<a·href="../../../../lib/stdlib-6.2.2/doc/html/lists.html#map/2"><code·class="inline">lists:map/2</code></a>).</p><p>The·function·<code·class="inline">undefined</code>·that·has·called·<code·class="inline">fprof:apply_start_stop/4</code>·is·an
247 unknown·function·because·that·call·was·not·recorded·in·the·trace.·It·was·only247 unknown·function·because·that·call·was·not·recorded·in·the·trace.·It·was·only
248 recorded·that·the·execution·returned·from·<code·class="inline">fprof:apply_start_stop/4</code>·to·some248 recorded·that·the·execution·returned·from·<code·class="inline">fprof:apply_start_stop/4</code>·to·some
249 other·function·above·in·the·call·stack,·or·that·the·process·exited·from·there.</p><p>Let·us·continue·down·the·printout·to·find:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9701663199-1">{</span><span·class="p"·data-group-id="9701663199-2">[</span><span·class="p"·data-group-id="9701663199-3">{</span><span·class="p"·data-group-id="9701663199-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_[·...·truncated·by·diffoscope;·len:·405,·SHA:·0b8ac120bb1454de8fab7af08415fe62258e4bb19bf76ab8b55063859b7f7031·...·]-3">}</span><span·class="p">,</span><span·class="w">249 other·function·above·in·the·call·stack,·or·that·the·process·exited·from·there.</p><p>Let·us·continue·down·the·printout·to·find:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0605865103-1">{</span><span·class="p"·data-group-id="0605865103-2">[</span><span·class="p"·data-group-id="0605865103-3">{</span><span·class="p"·data-group-id="0605865103-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_[·...·truncated·by·diffoscope;·len:·405,·SHA:·8cc7c373522244df9a1bbe36276ea01ff8a9736f62c6ac2f8e8d6abbca659b2f·...·]-3">}</span><span·class="p">,</span><span·class="w">
250 ··</span><span·class="p"·data-group-id="9701663199-5">{</span><span·class="p"·data-group-id="9701663199-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="9701663199[·...·truncated·by·diffoscope;·len:·352,·SHA:·7e5409df2c257a4eb4fc10804b8e4913e4803e0c8bedc3371da5d96b9719a701·...·]-2">]</span><span·class="p">,</span><span·class="w">250 ··</span><span·class="p"·data-group-id="0605865103-5">{</span><span·class="p"·data-group-id="0605865103-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="0605865103[·...·truncated·by·diffoscope;·len:·352,·SHA:·0708924e4cc8a2a5b2e03f21fb97e0d7336f36b7d8a407c776b07e7979810a83·...·]-2">]</span><span·class="p">,</span><span·class="w">
251 ·</span><span·class="p"·data-group-id="9701663199-7">{</span><span·class="w">·</span><span·class="p"·data-group-id="9701663199-8">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·323,·SHA:·38d64ba4370f23634470492f4a3679965a6722c93e235f7cec3daea8930eb0bf·...·]-7">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">251 ·</span><span·class="p"·data-group-id="0605865103-7">{</span><span·class="w">·</span><span·class="p"·data-group-id="0605865103-8">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·323,·SHA:·e996dd8564a8a41a2d4c9960f5b42d0fd1aba0165308e6e7d0fe1325273d008b·...·]-7">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">
252 ·</span><span·class="p"·data-group-id="9701663199-9">[</span><span·class="p"·data-group-id="9701663199-10">{</span><span·class="p"·data-group-id="9701663199-11">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</s[·...·truncated·by·diffoscope;·len:·355,·SHA:·afea4a0aa7a45735d64ae955b1ecf4850c58930a793d49065257fc617d304922·...·]-10">}</span><span·class="p">,</span><span·class="w">252 ·</span><span·class="p"·data-group-id="0605865103-9">[</span><span·class="p"·data-group-id="0605865103-10">{</span><span·class="p"·data-group-id="0605865103-11">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</s[·...·truncated·by·diffoscope;·len:·355,·SHA:·5f8f19ba410667bed75bf914ca2ac917d02ea57f99661909ce693dc81f852f5e·...·]-10">}</span><span·class="p">,</span><span·class="w">
253 ··</span><span·class="p"·data-group-id="9701663199-12">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">······························</span><span·class="mi">57</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">6.041</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·102,·SHA:·7ca39c8dbed00c534730dae128e45236240a44b6adf01a1f68bc6b3402472054·...·]-12">}</span><span·class="p">,</span><span·class="w">253 ··</span><span·class="p"·data-group-id="0605865103-12">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">······························</span><span·class="mi">57</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">6.041</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·102,·SHA:·4ecceea3481c9762be86315b76947b5a15d99cfed4527423f796bb90c5ab1b1a·...·]-12">}</span><span·class="p">,</span><span·class="w">
254 ··</span><span·class="p"·data-group-id="9701663199-13">{</span><span·class="p"·data-group-id="9701663199-14">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="97016631[·...·truncated·by·diffoscope;·len:·409,·SHA:·52a9bbcc8b1583c0e691eba84d526c91d9e055a5f63b5a79e0427aeae6df54ec·...·]-1">}</span><span·class="p">.</span></code></pre><p>If·you·compare·with·the·code·you·will·see·there·also·that254 ··</span><span·class="p"·data-group-id="0605865103-13">{</span><span·class="p"·data-group-id="0605865103-14">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="06058651[·...·truncated·by·diffoscope;·len:·409,·SHA:·3062cc79fe741ad5fab894dcbfdc5a0827d483ccffec8427acef250fd4c16510·...·]-1">}</span><span·class="p">.</span></code></pre><p>If·you·compare·with·the·code·you·will·see·there·also·that
255 <code·class="inline">foo:create_file_slow/3</code>·was·called·only·from·<code·class="inline">foo:create_file_slow/2</code>·and255 <code·class="inline">foo:create_file_slow/3</code>·was·called·only·from·<code·class="inline">foo:create_file_slow/2</code>·and
256 itself,·and·called·only·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>,·note·the·number·of·calls·to256 itself,·and·called·only·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>,·note·the·number·of·calls·to
257 <a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>.·But·here·we·see·that·<code·class="inline">suspend</code>·was·called·a·few·times.·This·is·a257 <a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>.·But·here·we·see·that·<code·class="inline">suspend</code>·was·called·a·few·times.·This·is·a
258 pseudo·function·that·indicates·that·the·process·was·suspended·while·executing·in258 pseudo·function·that·indicates·that·the·process·was·suspended·while·executing·in
259 <code·class="inline">foo:create_file_slow/3</code>,·and·since·there·is·no·<code·class="inline">receive</code>·or·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#yield/0"><code·class="inline">erlang:yield/0</code></a>·in259 <code·class="inline">foo:create_file_slow/3</code>,·and·since·there·is·no·<code·class="inline">receive</code>·or·<a·href="../../../../erts-15.2.6/doc/html/erlang.html#yield/0"><code·class="inline">erlang:yield/0</code></a>·in
260 the·code,·it·must·be·Erlang·scheduling·suspensions,·or·the·trace·file·driver260 the·code,·it·must·be·Erlang·scheduling·suspensions,·or·the·trace·file·driver
261 compensating·for·large·file·write·operations·(these·are·regarded·as·a·schedule261 compensating·for·large·file·write·operations·(these·are·regarded·as·a·schedule
262 out·followed·by·a·schedule·in·to·the·same·process).</p><p>Let·us·find·the·<code·class="inline">suspend</code>·entry:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7295050193-1">{</span><span·class="p"·data-group-id="7295050193-2">[</span><span·class="p"·data-group-id="7295050193-3">{</span><span·class="p"·data-group-id="7295050193-4">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write<[·...·truncated·by·diffoscope;·len:·405,·SHA:·8426b04c52fd7e348a9bea5e3a633bb200bdbfa4021780c29957c18e67a5ee37·...·]-3">}</span><span·class="p">,</span><span·class="w">262 out·followed·by·a·schedule·in·to·the·same·process).</p><p>Let·us·find·the·<code·class="inline">suspend</code>·entry:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1942961719-1">{</span><span·class="p"·data-group-id="1942961719-2">[</span><span·class="p"·data-group-id="1942961719-3">{</span><span·class="p"·data-group-id="1942961719-4">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write<[·...·truncated·by·diffoscope;·len:·405,·SHA:·66151101a3a1230c941c5ad9112af8f54a0955ba1f33f1b8539cc709c1735c78·...·]-3">}</span><span·class="p">,</span><span·class="w">
263 ··</span><span·class="p"·data-group-id="7295050193-5">{</span><span·class="p"·data-group-id="7295050193-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="7295050193[·...·truncated·by·diffoscope;·len:·299,·SHA:·70ec22968f40b6a02717b5396b6fb74f237cf3379444168ff55b491bb00e5b1d·...·]-5">}</span><span·class="p">,</span><span·class="w">263 ··</span><span·class="p"·data-group-id="1942961719-5">{</span><span·class="p"·data-group-id="1942961719-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="1942961719[·...·truncated·by·diffoscope;·len:·299,·SHA:·342555323c81ce066fd6e8642f9fb5b1e4f528d222f112172e0874f82179a96a·...·]-5">}</span><span·class="p">,</span><span·class="w">
264 ··</span><span·class="p"·data-group-id="7295050193-7">{</span><span·class="p"·data-group-id="7295050193-8">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">drv_command</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="729505019[·...·truncated·by·diffoscope;·len:·299,·SHA:·40cf162f7c59f8a8f0246169f8a49a6ddc42adb807cbd1303223380d124d82d4·...·]-7">}</span><span·class="p">,</span><span·class="w">264 ··</span><span·class="p"·data-group-id="1942961719-7">{</span><span·class="p"·data-group-id="1942961719-8">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">drv_command</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="194296171[·...·truncated·by·diffoscope;·len:·299,·SHA:·2b70a650f21f3a4332361d78fdd5bdb19139eb7b6f98cd83c6197e42eb234330·...·]-7">}</span><span·class="p">,</span><span·class="w">
265 ··</span><span·class="p"·data-group-id="7295050193-9">{</span><span·class="p"·data-group-id="7295050193-10">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">drv_get_response</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="729[·...·truncated·by·diffoscope;·len:·301,·SHA:·cba0abee8d384946e428e2f2634ac000c42928bcd8b907bd63070f9e0d4de61e·...·]-9">}</span><span·class="p">,</span><span·class="w">265 ··</span><span·class="p"·data-group-id="1942961719-9">{</span><span·class="p"·data-group-id="1942961719-10">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">drv_get_response</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="194[·...·truncated·by·diffoscope;·len:·301,·SHA:·7cca162cba61822a4060287ca730acc5150e7cf8914fceaa1d8357f8e377ca33·...·]-9">}</span><span·class="p">,</span><span·class="w">
266 ··</span><span·class="p"·data-group-id="7295050193-11">{</span><span·class="p"·data-group-id="7295050193-12">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">map</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="7295050193-12">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·66fba052d1f1bce43d08a76724dab8af30b83e677bc50578544d199885ac083a·...·]-11">}</span><span·class="p">,</span><span·class="w">266 ··</span><span·class="p"·data-group-id="1942961719-11">{</span><span·class="p"·data-group-id="1942961719-12">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">map</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1942961719-12">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·aff6db07f7fa6968188e2d24d17fc9942ce2d9a7970f05fa2bae34a0dabcf5b0·...·]-11">}</span><span·class="p">,</span><span·class="w">
267 ··</span><span·class="p"·data-group-id="7295050193-13">{</span><span·class="p"·data-group-id="7295050193-14">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="7295050193-14[·...·truncated·by·diffoscope;·len:·302,·SHA:·a1e95e71202ad229d1b8cc2c413970f35890e5a86f6509ed1155ea5e2f07e63d·...·]-13">}</span><span·class="p">,</span><span·class="w">267 ··</span><span·class="p"·data-group-id="1942961719-13">{</span><span·class="p"·data-group-id="1942961719-14">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1942961719-14[·...·truncated·by·diffoscope;·len:·302,·SHA:·772cffd00fed8a0703c2d29813e5091bc343210c292e14c61ca7ba3f24795aa3·...·]-13">}</span><span·class="p">,</span><span·class="w">
268 ··</span><span·class="p"·data-group-id="7295050193-15">{</span><span·class="p"·data-group-id="7295050193-16">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">port_command</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="729505019[·...·truncated·by·diffoscope;·len:·302,·SHA:·f386542458e764bd495a16a551d03771000d226f1cd82dcb1f99e91e8f87308e·...·]-15">}</span><span·class="p">,</span><span·class="w">268 ··</span><span·class="p"·data-group-id="1942961719-15">{</span><span·class="p"·data-group-id="1942961719-16">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">port_command</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="194296171[·...·truncated·by·diffoscope;·len:·302,·SHA:·6d2fe9ba363cf14cd21355be5caf118410ea8ae40b0a850737f6ad584ca22ba6·...·]-15">}</span><span·class="p">,</span><span·class="w">
269 ··</span><span·class="p"·data-group-id="7295050193-17">{</span><span·class="p"·data-group-id="7295050193-18">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">drv_command</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="7295050[·...·truncated·by·diffoscope;·len:·302,·SHA:·7d82fd620a0856512f1d5dd9ff8cbfbada30cf457f63ee39a8102a708b17a382·...·]-17">}</span><span·class="p">,</span><span·class="w">269 ··</span><span·class="p"·data-group-id="1942961719-17">{</span><span·class="p"·data-group-id="1942961719-18">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">drv_command</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="1942961[·...·truncated·by·diffoscope;·len:·302,·SHA:·98d2cf718424bf24b50a8279cca7a0f0793161d9992bd8c3d41f914f389c8ca9·...·]-17">}</span><span·class="p">,</span><span·class="w">
270 ··</span><span·class="p"·data-group-id="7295050193-19">{</span><span·class="p"·data-group-id="7295050193-20">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">translate_response</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·302,·SHA:·97d3948fb0976d9b990a0f82c0677225941f05977b4b495daa9f4683fa6904a5·...·]-19">}</span><span·class="p">,</span><span·class="w">270 ··</span><span·class="p"·data-group-id="1942961719-19">{</span><span·class="p"·data-group-id="1942961719-20">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">translate_response</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·302,·SHA:·9f8ae4b15d2d685157f7bd60379acc17043552ca84399e4d31012c272bac690e·...·]-19">}</span><span·class="p">,</span><span·class="w">
271 ··</span><span·class="p"·data-group-id="7295050193-21">{</span><span·class="p"·data-group-id="7295050193-22">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">&#39;-drv_command/2-fun-0-&#39;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·312,·SHA:·ed5ddb47619894c30add29d2ea0006458c78815d9b505c8237444f51a0b787fe·...·]-21">}</span><span·class="p">,</span><span·class="w">271 ··</span><span·class="p"·data-group-id="1942961719-21">{</span><span·class="p"·data-group-id="1942961719-22">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">&#39;-drv_command/2-fun-0-&#39;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·da[·...·truncated·by·diffoscope;·len:·312,·SHA:·e43dacace443f11eee70116f5421e84ab464902c8d498c2e066bc067b0d2e0d8·...·]-21">}</span><span·class="p">,</span><span·class="w">
272 ··</span><span·class="p"·data-group-id="7295050193-23">{</span><span·class="p"·data-group-id="7295050193-24">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">seq</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="7295050193-24">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·c7fb99e75a02212120429b5f7dc1d5549cea504cf187457d650e7cc8045b91fa·...·]-23">}</span><span·class="p">,</span><span·class="w">272 ··</span><span·class="p"·data-group-id="1942961719-23">{</span><span·class="p"·data-group-id="1942961719-24">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">seq</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="1942961719-24">}</s[·...·truncated·by·diffoscope;·len:·302,·SHA:·778a56f9faf64c2ee75aff5527a1add76eeb2bb986a223d0a1642b0401333e08·...·]-23">}</span><span·class="p">,</span><span·class="w">
273 ··</span><span·class="p"·data-group-id="7295050193-25">{</span><span·class="p"·data-group-id="7295050193-26">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">&#39;-create_file_slow/2-fun-0-&#39;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·311,·SHA:·af01b597171b706e1864e1a07744a100bcfb5b73937405d632bccdc3fd354b50·...·]-25">}</span><span·class="p">,</span><span·class="w">273 ··</span><span·class="p"·data-group-id="1942961719-25">{</span><span·class="p"·data-group-id="1942961719-26">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">&#39;-create_file_slow/2-fun-0-&#39;</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·311,·SHA:·f2aa3b05236c54647195c37fd4d6d84e49dd747bab4b03cf753b439f2ca628a6·...·]-25">}</span><span·class="p">,</span><span·class="w">
274 ··</span><span·class="p"·data-group-id="7295050193-27">{</span><span·class="p"·data-group-id="7295050193-28">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">bump_reductions</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="729505[·...·truncated·by·diffoscope;·len:·302,·SHA:·2b5fbae51f2b44e6aff097e586c948c1ff3405a965e5eb62a2e97bbe48728d26·...·]-27">}</span><span·class="p">,</span><span·class="w">274 ··</span><span·class="p"·data-group-id="1942961719-27">{</span><span·class="p"·data-group-id="1942961719-28">{</span><span·class="ss">erlang</span><span·class="p">,</span><span·class="nb">bump_reductions</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="194296[·...·truncated·by·diffoscope;·len:·302,·SHA:·231a8bc8f3fa7dec5e06b9cbbf6c71f3a187ab4fff493565ff6be42573406f0d·...·]-27">}</span><span·class="p">,</span><span·class="w">
275 ··</span><span·class="p"·data-group-id="7295050193-29">{</span><span·class="p"·data-group-id="7295050193-30">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">open_int_setopts</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="72[·...·truncated·by·diffoscope;·len:·302,·SHA:·d947db0470126ddc2bc6b806abbcdb4592fbdc80c3cfc7d0d6c1d07e0d8ff42d·...·]-29">}</span><span·class="p">,</span><span·class="w">275 ··</span><span·class="p"·data-group-id="1942961719-29">{</span><span·class="p"·data-group-id="1942961719-30">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">open_int_setopts</span><span·class="p">,</span><span·class="mi">3</span><span·class="p"·data-group-id="19[·...·truncated·by·diffoscope;·len:·302,·SHA:·2bbad84077014a3431a69a96468aecb2289c786a6a7735e8860667ec9aa886b0·...·]-29">}</span><span·class="p">,</span><span·class="w">
276 ··</span><span·class="p"·data-group-id="7295050193-31">{</span><span·class="p"·data-group-id="7295050193-32">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">i32</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="7295050193-32">[·...·truncated·by·diffoscope;·len:·302,·SHA:·602337ddfde799aced1621e289ba7ca5da4bda496666996aa56d2bbf3d5ea404·...·]-31">}</span><span·class="p">,</span><span·class="w">276 ··</span><span·class="p"·data-group-id="1942961719-31">{</span><span·class="p"·data-group-id="1942961719-32">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">i32</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="1942961719-32">[·...·truncated·by·diffoscope;·len:·302,·SHA:·c47a4b3caf10e3bd2eb3410644b3c0c96f8cb5e0a607f1bb2e2ddb019b260dda·...·]-31">}</span><span·class="p">,</span><span·class="w">
277 ··</span><span·class="p"·data-group-id="7295050193-33">{</span><span·class="p"·data-group-id="7295050193-34">{</span><span·class="ss">fprof</span><span·class="p">,</span><span·class="ss">apply_start_stop</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="729505[·...·truncated·by·diffoscope;·len:·356,·SHA:·12e2871052578a1ff4fa1e4b7cc8c68e4c5b796cef34114bdefe242638213b00·...·]-2">]</span><span·class="p">,</span><span·class="w">277 ··</span><span·class="p"·data-group-id="1942961719-33">{</span><span·class="p"·data-group-id="1942961719-34">{</span><span·class="ss">fprof</span><span·class="p">,</span><span·class="ss">apply_start_stop</span><span·class="p">,</span><span·class="mi">4</span><span·class="p"·data-group-id="194296[·...·truncated·by·diffoscope;·len:·356,·SHA:·de8d6bd99b18d0ab15fcd0f482eb084dac101b2ee1d797367ff396b9be754d01·...·]-2">]</span><span·class="p">,</span><span·class="w">
278 ·</span><span·class="p"·data-group-id="7295050193-35">{</span><span·class="w">·</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">·····························</span><span·class="mi">299</span><span·class="p">,</span><span·class="w">···</span><span·class="mf">32.002</[·...·truncated·by·diffoscope;·len:·126,·SHA:·f7288c29eee825a637d68733be51a15c0cc42ded9da3cc51705af63569fc1702·...·]-35">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">278 ·</span><span·class="p"·data-group-id="1942961719-35">{</span><span·class="w">·</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">·····························</span><span·class="mi">299</span><span·class="p">,</span><span·class="w">···</span><span·class="mf">32.002</[·...·truncated·by·diffoscope;·len:·126,·SHA:·8b63bbf782993c72edf6b505080380dd75636fd08749a3f51d1550a188ad5eef·...·]-35">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">
279 ·</span><span·class="p"·data-group-id="7295050193-36">[</span><span·class="w">·</span><span·class="p"·data-group-id="7295050193-36">]</span><span·class="p"·data-group-id="7295050193-1">}</span><span·class="p">.</span></code></pre><p>We·find·no·particularly·long·suspend·times,·so·no·function·seems·to·have·waited279 ·</span><span·class="p"·data-group-id="1942961719-36">[</span><span·class="w">·</span><span·class="p"·data-group-id="1942961719-36">]</span><span·class="p"·data-group-id="1942961719-1">}</span><span·class="p">.</span></code></pre><p>We·find·no·particularly·long·suspend·times,·so·no·function·seems·to·have·waited
280 in·a·receive·statement.·Actually,·<code·class="inline">prim_file:drv_command/4</code>·contains·a·receive280 in·a·receive·statement.·Actually,·<code·class="inline">prim_file:drv_command/4</code>·contains·a·receive
281 statement,·but·in·this·test·program,·the·message·lies·in·the·process·receive281 statement,·but·in·this·test·program,·the·message·lies·in·the·process·receive
282 buffer·when·the·receive·statement·is·entered.·We·also·see·that·the·total·suspend282 buffer·when·the·receive·statement·is·entered.·We·also·see·that·the·total·suspend
283 time·for·the·test·run·is·small.</p><p>The·<code·class="inline">suspend</code>·pseudo·function·has·an·<code·class="inline">OWN</code>·time·of·zero.·This·is·to·prevent283 time·for·the·test·run·is·small.</p><p>The·<code·class="inline">suspend</code>·pseudo·function·has·an·<code·class="inline">OWN</code>·time·of·zero.·This·is·to·prevent
284 the·process·total·<code·class="inline">OWN</code>·time·from·including·time·in·suspension.·Whether·suspend284 the·process·total·<code·class="inline">OWN</code>·time·from·including·time·in·suspension.·Whether·suspend
285 time·is·really·<code·class="inline">ACC</code>·or·<code·class="inline">OWN</code>·time·is·more·of·a·philosophical·question.</p><p>Now·we·look·at·another·interesting·pseudo·function,·<code·class="inline">garbage_collect</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2784324278-1">{</span><span·class="p"·data-group-id="2784324278-2">[</span><span·class="p"·data-group-id="2784324278-3">{</span><span·class="p"·data-group-id="2784324278-4">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">d[·...·truncated·by·diffoscope;·len:·404,·SHA:·9d9b6d8818061c95f5f246e0f051219554dfd60d691cb8914396c04c24b17e94·...·]8-3">}</span><span·class="p">,</span><span·class="w">285 time·is·really·<code·class="inline">ACC</code>·or·<code·class="inline">OWN</code>·time·is·more·of·a·philosophical·question.</p><p>Now·we·look·at·another·interesting·pseudo·function,·<code·class="inline">garbage_collect</code>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0745736628-1">{</span><span·class="p"·data-group-id="0745736628-2">[</span><span·class="p"·data-group-id="0745736628-3">{</span><span·class="p"·data-group-id="0745736628-4">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">d[·...·truncated·by·diffoscope;·len:·404,·SHA:·f9d5bdc889dd47b398db54d9730470f98aaf9383e23f271c5be9a3dfd0dc7cad·...·]8-3">}</span><span·class="p">,</span><span·class="w">
286 ··</span><span·class="p"·data-group-id="2784324278-5">{</span><span·class="p"·data-group-id="2784324278-6">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="2784324278-6">}[·...·truncated·by·diffoscope;·len:·298,·SHA:·1228959f67057729fc80405a61b01ad87b87f062d97f749b540c46babfe29fb0·...·]8-5">}</span><span·class="p">,</span><span·class="w">286 ··</span><span·class="p"·data-group-id="0745736628-5">{</span><span·class="p"·data-group-id="0745736628-6">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="0745736628-6">}[·...·truncated·by·diffoscope;·len:·298,·SHA:·ef844b640a609b5fb5446326112eb2cc12eb0abcb5c9294aa85c4da9b679c51a·...·]8-5">}</span><span·class="p">,</span><span·class="w">
287 ··</span><span·class="p"·data-group-id="2784324278-7">{</span><span·class="p"·data-group-id="2784324278-8">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">map</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="2784324278-8">}</span[·...·truncated·by·diffoscope;·len:·351,·SHA:·35c6e53d59714d94add12851816be1034e92dc645708ca96b40138ccfd82e67e·...·]8-2">]</span><span·class="p">,</span><span·class="w">287 ··</span><span·class="p"·data-group-id="0745736628-7">{</span><span·class="p"·data-group-id="0745736628-8">{</span><span·class="ss">lists</span><span·class="p">,</span><span·class="ss">map</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="0745736628-8">}</span[·...·truncated·by·diffoscope;·len:·351,·SHA:·d667b012f68f473ff1e5605cb578b7f3a3066c3b6ad6b2dedad56df3287c9809·...·]8-2">]</span><span·class="p">,</span><span·class="w">
288 ·</span><span·class="p"·data-group-id="2784324278-9">{</span><span·class="w">·</span><span·class="nb">garbage_collect</span><span·class="p">,</span><span·class="w">······················</span><span·class="mi">43</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">1.760</s[·...·truncated·by·diffoscope;·len:·124,·SHA:·90f17c045c18c2062d23fd650f7019e2b7a7fc3f957966335c710ad1377b1a31·...·]8-9">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">288 ·</span><span·class="p"·data-group-id="0745736628-9">{</span><span·class="w">·</span><span·class="nb">garbage_collect</span><span·class="p">,</span><span·class="w">······················</span><span·class="mi">43</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">1.760</s[·...·truncated·by·diffoscope;·len:·124,·SHA:·d3246f8e49ef26db0195e0b682b4c0ad62804be75b38205f14e7ac6c89c66293·...·]8-9">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">
289 ·</span><span·class="p"·data-group-id="2784324278-10">[</span><span·class="w">·</span><span·class="p"·data-group-id="2784324278-10">]</span><span·class="p"·data-group-id="2784324278-1">}</span><span·class="p">.</span></code></pre><p>Here·we·see·that·no·function·stands·out,·which·is·very·normal.</p><p>The·<code·class="inline">garbage_collect</code>·pseudo·function·has·not·an·<code·class="inline">OWN</code>·time·of·zero·like289 ·</span><span·class="p"·data-group-id="0745736628-10">[</span><span·class="w">·</span><span·class="p"·data-group-id="0745736628-10">]</span><span·class="p"·data-group-id="0745736628-1">}</span><span·class="p">.</span></code></pre><p>Here·we·see·that·no·function·stands·out,·which·is·very·normal.</p><p>The·<code·class="inline">garbage_collect</code>·pseudo·function·has·not·an·<code·class="inline">OWN</code>·time·of·zero·like
290 <code·class="inline">suspend</code>,·instead·it·is·equal·to·the·<code·class="inline">ACC</code>·time.</p><p>Garbage·collection·often·occurs·while·a·process·is·suspended,·but·<code·class="inline">fprof</code>·hides290 <code·class="inline">suspend</code>,·instead·it·is·equal·to·the·<code·class="inline">ACC</code>·time.</p><p>Garbage·collection·often·occurs·while·a·process·is·suspended,·but·<code·class="inline">fprof</code>·hides
291 this·fact·by·pretending·that·the·suspended·function·was·first·unsuspended·and291 this·fact·by·pretending·that·the·suspended·function·was·first·unsuspended·and
292 then·garbage·collected.·Otherwise·the·printout·would·show·<code·class="inline">garbage_collect</code>292 then·garbage·collected.·Otherwise·the·printout·would·show·<code·class="inline">garbage_collect</code>
293 being·called·from·<code·class="inline">suspend</code>,·but·not·which·function·that·might·have·caused·the293 being·called·from·<code·class="inline">suspend</code>,·but·not·which·function·that·might·have·caused·the
294 garbage·collection.</p><p>Let·us·now·get·back·to·the·test·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4996613499-1">{</span><span·class="p"·data-group-id="4996613499-2">[</span><span·class="p"·data-group-id="4996613499-3">{</span><span·class="p"·data-group-id="4996613499-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_[·...·truncated·by·diffoscope;·len:·405,·SHA:·02f83242770d89745a609bc829adff1eabc5574c2c5416a1509104feeb8a3481·...·]-3">}</span><span·class="p">,</span><span·class="w">294 garbage·collection.</p><p>Let·us·now·get·back·to·the·test·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6151948138-1">{</span><span·class="p"·data-group-id="6151948138-2">[</span><span·class="p"·data-group-id="6151948138-3">{</span><span·class="p"·data-group-id="6151948138-4">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_[·...·truncated·by·diffoscope;·len:·405,·SHA:·0aa94a435909676cdd331d01c72d891909203ffe2c1edfe64e96cb23e6750781·...·]-3">}</span><span·class="p">,</span><span·class="w">
295 ··</span><span·class="p"·data-group-id="4996613499-5">{</span><span·class="p"·data-group-id="4996613499-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="4996613499[·...·truncated·by·diffoscope;·len:·352,·SHA:·d94c078c4301700cc6f5300b3433ea521298d78ce51c73511835a50a887a781d·...·]-2">]</span><span·class="p">,</span><span·class="w">295 ··</span><span·class="p"·data-group-id="6151948138-5">{</span><span·class="p"·data-group-id="6151948138-6">{</span><span·class="ss">foo</span><span·class="p">,</span><span·class="ss">create_file_slow</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-id="6151948138[·...·truncated·by·diffoscope;·len:·352,·SHA:·eb9feac57a054d8df2c1720792de1e53a33ec088d34c73d93e095b284b9e3fb6·...·]-2">]</span><span·class="p">,</span><span·class="w">
296 ·</span><span·class="p"·data-group-id="4996613499-7">{</span><span·class="w">·</span><span·class="p"·data-group-id="4996613499-8">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·323,·SHA:·d569f648bdb0b023cf5c3fb276b257bf78d6c3884dd56033dd9f5c183662582b·...·]-7">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">296 ·</span><span·class="p"·data-group-id="6151948138-7">{</span><span·class="w">·</span><span·class="p"·data-group-id="6151948138-8">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi">2</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·323,·SHA:·858d2b51ced52473a51e98513dbdc624435f30b8c471fc06850f207f83329aa0·...·]-7">}</span><span·class="p">,</span><span·class="w">·····</span><span·class="c1">%</span><span·class="w">
297 ·</span><span·class="p"·data-group-id="4996613499-9">[</span><span·class="p"·data-group-id="4996613499-10">{</span><span·class="p"·data-group-id="4996613499-11">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·355,·SHA:·355e36b8a12814cbf61a443a5d839ce3db7d07d1c59c4277e26d9e97f282d309·...·]-10">}</span><span·class="p">,</span><span·class="w">297 ·</span><span·class="p"·data-group-id="6151948138-9">[</span><span·class="p"·data-group-id="6151948138-10">{</span><span·class="p"·data-group-id="6151948138-11">{</span><span·class="ss">prim_file</span><span·class="p">,</span><span·class="ss">write</span><span·class="p">,</span><span·class="mi"[·...·truncated·by·diffoscope;·len:·355,·SHA:·a003218df485d27ad53057c95d5ea36671e658d8ebaeb30c504043cb17b15d42·...·]-10">}</span><span·class="p">,</span><span·class="w">
298 ··</span><span·class="p"·data-group-id="4996613499-12">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">······························</span><span·class="mi">53</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">6.281</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·209,·SHA:·257fb862bdc2ee4db264f6ade21970032364c2490cc44d7f01f9657cc7ddab47·...·]-1">}</span><span·class="p">.</span></code></pre><p>Not·unexpectedly,·we·see·that·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>·was·called·from298 ··</span><span·class="p"·data-group-id="6151948138-12">{</span><span·class="ss">suspend</span><span·class="p">,</span><span·class="w">······························</span><span·class="mi">53</span><span·class="p">,</span><span·class="w">····</span><span·class="mf">6.281</span><span·class="p">,</[·...·truncated·by·diffoscope;·len:·209,·SHA:·809d9f1c2d0e5ec3d5962b2ad49530b000e7c160f3023c5f1d3879cbe82e0408·...·]-1">}</span><span·class="p">.</span></code></pre><p>Not·unexpectedly,·we·see·that·<a·href="../../../../lib/kernel-10.2.6/doc/html/file.html#write/2"><code·class="inline">file:write/2</code></a>·was·called·from
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172 ··<a·href="#immediate-profiling"·class="hover-link">172 ··<a·href="#immediate-profiling"·class="hover-link">
173 ····<i·class="ri-link-m"·aria-hidden="true"></i>173 ····<i·class="ri-link-m"·aria-hidden="true"></i>
174 ··</a>174 ··</a>
175 ··<span·class="text">Immediate·profiling</span>175 ··<span·class="text">Immediate·profiling</span>
176 </h2>176 </h2>
177 <p>It·is·also·possible·to·trace·immediately·into·the·profiling·process·that·creates177 <p>It·is·also·possible·to·trace·immediately·into·the·profiling·process·that·creates
178 the·raw·profile·data,·that·is·to·short·circuit·the·tracing·and·profiling·steps178 the·raw·profile·data,·that·is·to·short·circuit·the·tracing·and·profiling·steps
179 so·that·the·filesystem·is·not·used·for·tracing.</p><p>Do·something·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3822806370-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tracer</span><span·class="p"·data-group-id="3822806370-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·201,·SHA:·bdf13d32d7bac16a5faeafa0fd00b5afc66f05160a9f5be7d1623459f542fb8e·...·]-2">)</span><span·class="p">,</span><span·class="w">179 so·that·the·filesystem·is·not·used·for·tracing.</p><p>Do·something·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9939389078-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tracer</span><span·class="p"·data-group-id="9939389078-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·[·...·truncated·by·diffoscope;·len:·201,·SHA:·5695e8ddc0f1a7fd0345877178c01bb3f019ae737f85feeb5867bd576af520e7·...·]-2">)</span><span·class="p">,</span><span·class="w">
180 </span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="3822806370-3">(</span><span·class="p"·data-group-id="3822806370-4">[</span><span·class="ss">start</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3822806370-5">{</span><span·class="ss">tracer</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·203,·SHA:·ea70ef4a7ad416eedec9a7d874f0d6fa3fadc95edfb7a4a94cfec1dc2d35ecfe·...·]-3">)</span><span·class="p">,</span><span·class="w">180 </span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="9939389078-3">(</span><span·class="p"·data-group-id="9939389078-4">[</span><span·class="ss">start</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9939389078-5">{</span><span·class="ss">tracer</span><span·class="p">,</sp[·...·truncated·by·diffoscope;·len:·203,·SHA:·bffaed1e5077bdd0f41ed9cfdfc62da70a4598f6c336c08f5656e8192bded25b·...·]-3">)</span><span·class="p">,</span><span·class="w">
181 </span><span·class="c1">%%·Run·code·to·profile</span><span·class="w">181 </span><span·class="c1">%%·Run·code·to·profile</span><span·class="w">
182 </span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="3822806370-6">(</span><span·class="ss">stop</span><span·class="p"·data-group-id="3822806370-6">)</span><span·class="p">;</span></code></pre><p>This·puts·less·load·on·the·filesystem,·but·much·more·load·on·the·Erlang·runtime182 </span><span·class="nc">fprof</span><span·class="p">:</span><span·class="nf">trace</span><span·class="p"·data-group-id="9939389078-6">(</span><span·class="ss">stop</span><span·class="p"·data-group-id="9939389078-6">)</span><span·class="p">;</span></code></pre><p>This·puts·less·load·on·the·filesystem,·but·much·more·load·on·the·Erlang·runtime
183 system.</p>183 system.</p>
184 </div>184 </div>
  
185 <div·class="bottom-actions"·id="bottom-actions">185 <div·class="bottom-actions"·id="bottom-actions">
186 ··<div·class="bottom-actions-item">186 ··<div·class="bottom-actions-item">
  
187 ······<a·href="erlang_mode_chapter.html"·class="bottom-actions-button"·rel="prev">187 ······<a·href="erlang_mode_chapter.html"·class="bottom-actions-button"·rel="prev">
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227 ······<p·class="built-using">227 ······<p·class="built-using">
228 ········Built·using228 ········Built·using
229 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the229 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
230 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>230 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
231 ······</p>231 ······</p>
232 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>232 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
233 ····</footer>233 ····</footer>
234 ··</div>234 ··</div>
235 </main>235 </main>
236 </div>236 </div>
237 <script>237 <script>
238 ··function·mermaidLoaded()·{238 ··function·mermaidLoaded()·{
239 ····mermaid.initialize({239 ····mermaid.initialize({
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1780 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1780 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1781 ······</p>1781 ······</p>
1782 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1782 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1783 ····</footer>1783 ····</footer>
1784 ··</div>1784 ··</div>
1785 </main>1785 </main>
1786 </div>1786 </div>
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229 ··&lt;nonode@nohost.104.0&gt;····5140··········0.7782········108229 ··&lt;nonode@nohost.104.0&gt;····5140··········0.7782········108
230 ok</code></pre><h2·id="example-with-mnesia-transaction-benchmark"·class="section-heading">230 ok</code></pre><h2·id="example-with-mnesia-transaction-benchmark"·class="section-heading">
231 ··<a·href="#example-with-mnesia-transaction-benchmark"·class="hover-link">231 ··<a·href="#example-with-mnesia-transaction-benchmark"·class="hover-link">
232 ····<i·class="ri-link-m"·aria-hidden="true"></i>232 ····<i·class="ri-link-m"·aria-hidden="true"></i>
233 ··</a>233 ··</a>
234 ··<span·class="text">Example·with·Mnesia·Transaction·Benchmark</span>234 ··<span·class="text">Example·with·Mnesia·Transaction·Benchmark</span>
235 </h2>235 </h2>
236 <p>From·the·Erlang·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="9381542628-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.0</span><span·class="p"·data-group-id="9381542628-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="9381542628-2">[</span><span·class="mi">64</spa[·...·truncated·by·diffoscope;·len:·1287,·SHA:·56548b5f4eca8172d98e30c50cc5ae45c4711cf2541ec9131ec1b5c61810ce84·...·]-7">]</span><span·class="w">236 <p>From·the·Erlang·shell:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Erlang</span><span·class="o">/</span><span·class="n">OTP</span><span·class="w">·</span><span·class="mi">27</span><span·class="w">·</span><span·class="p"·data-group-id="5204665604-1">[</span><span·class="ss">erts</span><span·class="o">-</span><span·class="mf">15.0</span><span·class="p"·data-group-id="5204665604-1">]</span><span·class="w">·</span><span·class="p"·data-group-id="5204665604-2">[</span><span·class="mi">64</spa[·...·truncated·by·diffoscope;·len:·1287,·SHA:·285c01fbe9e27f73601ea1d8a9357a783b6a647f8767b550233776e7966692a8·...·]-7">]</span><span·class="w">
  
237 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="9381542628-8">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·e1f3dfb13595ddfdb2240aeafb826d66ad8dd06455dc0a8d8219435e625c5b5f·...·]-8">)</span><span·class="gp·unselectable">237 </span><span·class="n">Eshell</span><span·class="w">·</span><span·class="n">V15</span><span·class="p">.</span><span·class="mi">0</span><span·class="w">·</span><span·class="p"·data-group-id="5204665604-8">(</span><span·class="ss">press</span><span·class="w">·</span><span·class="n">Ctrl</span><span·class="o">+</span><span·class="n">G</span><span·class="w">·</span><span·class="ss">to</span><span·class="w">·</span><span·class="ss">abort</span><sp[·...·truncated·by·diffoscope;·len:·399,·SHA:·fc3d3ed478335b052da6123d0a6940fd9ff09200bd060078297c87e737a47957·...·]-8">)</span><span·class="gp·unselectable">
238 1&gt;·</span><span·class="n">Conf</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="9381542628-10">[</span><span·class="p"·data-group-id="9381542628-11">{</span><span·class="ss">db_nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9381542628-12">[</span><span·class="nf">node</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·1155,·SHA:·53d1e5ef6eb161a8aa1026d46dded54b941a9a21b7db4a48d72d9bb5dcded1a1·...·]-17">}</span><span·class="p">,</span><span·class="w">238 1&gt;·</span><span·class="n">Conf</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="5204665604-10">[</span><span·class="p"·data-group-id="5204665604-11">{</span><span·class="ss">db_nodes</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5204665604-12">[</span><span·class="nf">node</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·1155,·SHA:·132b6b33b93d640c699d77ffa352b5d8442d7a9c4d753e72c4ebc03fc74e8f9e·...·]-17">}</span><span·class="p">,</span><span·class="w">
239 ····</span><span·class="p"·data-group-id="9381542628-20">{</span><span·class="ss">n_drivers_per_node</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p"·data-group-id="9381542628-20">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"[·...·truncated·by·diffoscope;·len:·465,·SHA:·bcbdfd9390ae29294bc83e6b69b1f7d8ca3988690e5bd3dc41bac924148ad059·...·]-22">}</span><span·class="p">,</span><span·class="w">239 ····</span><span·class="p"·data-group-id="5204665604-20">{</span><span·class="ss">n_drivers_per_node</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">10</span><span·class="p"·data-group-id="5204665604-20">}</span><span·class="p">,</span><span·class="w">·</span><span·class="p"[·...·truncated·by·diffoscope;·len:·465,·SHA:·08bf181dbc80618b097acc237c24ce3f68e59181d834741136790f4837204db6·...·]-22">}</span><span·class="p">,</span><span·class="w">
240 ····</span><span·class="p"·data-group-id="9381542628-23">{</span><span·class="ss">replica_type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ram_copies</span><span·class="p"·data-group-id="9381542628-23">}</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·519,·SHA:·dd10330e609a7b898af0ca2d8541dacbfe085f0b6b875958e1640eb09db019a9·...·]-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">240 ····</span><span·class="p"·data-group-id="5204665604-23">{</span><span·class="ss">replica_type</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ram_copies</span><span·class="p"·data-group-id="5204665604-23">}</span><span·class="p">,</span><span·class="w">·</span><span·class="[·...·truncated·by·diffoscope;·len:·519,·SHA:·6ac30d72b4065ca833e2720160df012f23962505cea1d35bb8e2854fb1772651·...·]-10">]</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">
241 </span><span·class="ss">ok</span><span·class="gp·unselectable">241 </span><span·class="ss">ok</span><span·class="gp·unselectable">
242 2&gt;·</span><span·class="nc">mnesia_tpcb</span><span·class="p">:</span><span·class="nf">init</span><span·class="p"·data-group-id="9381542628-26">(</span><span·class="p"·data-group-id="9381542628-27">[</span><span·class="p"·data-group-id="9381542628-28">{</span><span·class="ss">use_running_mnesia</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·[·...·truncated·by·diffoscope;·len:·194,·SHA:·02a043c57cd2bbc03a18248a95a85c978a393878cc8b82fb926f84ffe4fb4d4b·...·]-26">)</span><span·class="p">.</span><span·class="w">242 2&gt;·</span><span·class="nc">mnesia_tpcb</span><span·class="p">:</span><span·class="nf">init</span><span·class="p"·data-group-id="5204665604-26">(</span><span·class="p"·data-group-id="5204665604-27">[</span><span·class="p"·data-group-id="5204665604-28">{</span><span·class="ss">use_running_mnesia</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">false</span><span·[·...·truncated·by·diffoscope;·len:·194,·SHA:·015a54265f09e3fba2a3357a2d9839cb7b6995cc3febb513b86c04caa315d13d·...·]-26">)</span><span·class="p">.</span><span·class="w">
243 ····</span><span·class="p">.</span><span·class="w">243 ····</span><span·class="p">.</span><span·class="w">
244 ····</span><span·class="p">.</span><span·class="w">244 ····</span><span·class="p">.</span><span·class="w">
245 ····</span><span·class="p">.</span><span·class="w">245 ····</span><span·class="p">.</span><span·class="w">
246 </span><span·class="ss">ignore</span></code></pre><p>Initial·configuring·of·the·benchmark·is·done.·It·is·time·to·profile·the·actual246 </span><span·class="ss">ignore</span></code></pre><p>Initial·configuring·of·the·benchmark·is·done.·It·is·time·to·profile·the·actual
247 Mnesia·benchmark:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">lcnt</span><span·class="p">:</span><span·class="nf">apply</span><span·class="p"·data-group-id="8524836673-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="8524836673-2">(</span><span·class="p"·data-group-id="8524836673-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·836,·SHA:·61dd72da7a2790d23a4879aa5c605ca0f3c1f497246b0fef45951dde36840a00·...·]-7">{</span><span·class="ss">use_running_mnesia</span><span·class="p">,</span><span·class="w">247 Mnesia·benchmark:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="nc">lcnt</span><span·class="p">:</span><span·class="nf">apply</span><span·class="p"·data-group-id="2150550866-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="2150550866-2">(</span><span·class="p"·data-group-id="2150550866-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·836,·SHA:·2299c3276a14569c992b8f0d2069186d4cee33992e13fbf2dce43cb763355990·...·]-7">{</span><span·class="ss">use_running_mnesia</span><span·class="p">,</span><span·class="w">
248 ····</span><span·class="ss">true</span><span·class="p"·data-group-id="8524836673-7">}</span><span·class="p">|</span><span·class="n">Conf</span><span·class="p"·data-group-id="8524836673-6">]</span><span·class="p"·data-group-id="8524836673-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tps</span><sp[·...·truncated·by·diffoscope;·len:·138,·SHA:·08d025286bbd9085a700b3832f009c0718bce76a402261c706e614e5b88e6989·...·]-1">)</span><span·class="p">.</span><span·class="w">248 ····</span><span·class="ss">true</span><span·class="p"·data-group-id="2150550866-7">}</span><span·class="p">|</span><span·class="n">Conf</span><span·class="p"·data-group-id="2150550866-6">]</span><span·class="p"·data-group-id="2150550866-5">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tps</span><sp[·...·truncated·by·diffoscope;·len:·138,·SHA:·23ed8f4fc017a652b13f4ad3879cadb3168540d15a89e5c071cf9a20d4529fa6·...·]-1">)</span><span·class="p">.</span><span·class="w">
249 ······</span><span·class="p">.</span><span·class="w">249 ······</span><span·class="p">.</span><span·class="w">
250 ······</span><span·class="p">.</span><span·class="w">250 ······</span><span·class="p">.</span><span·class="w">
251 ······</span><span·class="p">.</span><span·class="w">251 ······</span><span·class="p">.</span><span·class="w">
252 </span><span·class="mf">50204.666666666664</span></code></pre><p>The·benchmark·runs·for·60·seconds·(followed·by·verification·and252 </span><span·class="mf">50204.666666666664</span></code></pre><p>The·benchmark·runs·for·60·seconds·(followed·by·verification·and
253 analysis),·and·then·returns·the·number·of·transactions·per·seconds.</p><pre><code·class="text">4&gt;·lcnt:swap_pid_keys().253 analysis),·and·then·returns·the·number·of·transactions·per·seconds.</p><pre><code·class="text">4&gt;·lcnt:swap_pid_keys().
254 ok254 ok
255 5&gt;·lcnt:conflicts().255 5&gt;·lcnt:conflicts().
Offset 346, 71 lines modifiedOffset 346, 71 lines modified
346 problematic·if·they·begin·to·have·conflicts·even·if·it·is·not·shown·in·a346 problematic·if·they·begin·to·have·conflicts·even·if·it·is·not·shown·in·a
347 particular·test.</p><h2·id="the-big-bang-benchmark"·class="section-heading">347 particular·test.</p><h2·id="the-big-bang-benchmark"·class="section-heading">
348 ··<a·href="#the-big-bang-benchmark"·class="hover-link">348 ··<a·href="#the-big-bang-benchmark"·class="hover-link">
349 ····<i·class="ri-link-m"·aria-hidden="true"></i>349 ····<i·class="ri-link-m"·aria-hidden="true"></i>
350 ··</a>350 ··</a>
351 ··<span·class="text">The·Big·Bang·Benchmark</span>351 ··<span·class="text">The·Big·Bang·Benchmark</span>
352 </h2>352 </h2>
353 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="6499843725-1">(</span><span·class="ss">big</span><span·class="p"·data-group-id="6499843725-1">)</span><span·class="p">.</span><span·class="w">353 <pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9935432943-1">(</span><span·class="ss">big</span><span·class="p"·data-group-id="9935432943-1">)</span><span·class="p">.</span><span·class="w">
354 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="6499843725-2">(</span><span·class="p"·data-group-id="6499843725-3">[</span><span·class="ss">bang</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="6499843725-3">]</span><span·class="p"·data-group-id="6499843725-2">)</span><span·class="p">.</span><span·class="w">354 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9935432943-2">(</span><span·class="p"·data-group-id="9935432943-3">[</span><span·class="ss">bang</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="9935432943-3">]</span><span·class="p"·data-group-id="9935432943-2">)</span><span·class="p">.</span><span·class="w">
  
355 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-4">(</span><span·class="p"·data-group-id="6499843725-5">[</span><span·class="p"·data-group-id="6499843725-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-6">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·143,·SHA:·21ca0f1d6eb0b9a2a6c362c611bb65ce0427572ffb6cf4e76547f5920554b578·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">355 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-4">(</span><span·class="p"·data-group-id="9935432943-5">[</span><span·class="p"·data-group-id="9935432943-5">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-6">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·143,·SHA:·5efeb0a88cd68448404c7cb045974e94631c0aaf0f79ca4e3fd4151631ffe3dd·...·]-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
356 ····</span><span·class="k">receive</span><span·class="w">356 ····</span><span·class="k">receive</span><span·class="w">
357 »       </span><span·class="p"·data-group-id="6499843725-7">{</span><span·class="ss">procs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Procs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReportTo</span><span·class="p"·data-group-id="6499843725-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">357 »       </span><span·class="p"·data-group-id="9935432943-7">{</span><span·class="ss">procs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Procs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReportTo</span><span·class="p"·data-group-id="9935432943-7">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
358 »       ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-8">(</span><span·class="n">Procs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-9">[</span><span·class="p"·data-group-id="6499843725-9">]</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·68,·SHA:·ebd4b30c4fda034d3e765bec4d65192e4e3695287c85f63ed76e86d1847c4f7e·...·]-8">)</span><span·class="w">358 »       ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-8">(</span><span·class="n">Procs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-9">[</span><span·class="p"·data-group-id="9935432943-9">]</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·68,·SHA:·471b1f2c2920e0847a0923407adc8a418917ed14bfe7fca43c309d8c4247de79·...·]-8">)</span><span·class="w">
359 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">359 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
360 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-10">(</span><span·class="p"·data-group-id="6499843725-11">[</span><span·class="p"·data-group-id="6499843725-11">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-12">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·149,·SHA:·d4ca9092881eec51b56fd1875dee4eaf4b843b06ab81f0c3ab20f4556d14f00f·...·]-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">360 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-10">(</span><span·class="p"·data-group-id="9935432943-11">[</span><span·class="p"·data-group-id="9935432943-11">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-12">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·149,·SHA:·0ba3772d8bc12271859048c1b742ce86d293553258da7009d7176d50c8a65ef7·...·]-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
361 ····</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-13">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="6499843725-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·406,·SHA:·653214fdeed505473d810cea1ba42fcf665aa60e24952a8f2396e28163891138·...·]-14">}</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">361 ····</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-13">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="9935432943-13">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·406,·SHA:·0a5db1bfa21b7839fe33b25b74904772a79d463deccf39bff40b39482b1acaee·...·]-14">}</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
362 ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-16">(</span><span·class="p"·data-group-id="6499843725-17">[</span><span·class="p"·data-group-id="6499843725-17">]</span><span·class="p">,</span><span·class="p"·data-group-id="6499843725-18">[</span><span·class="p"·data-group-id="6499843725-18">][·...·truncated·by·diffoscope;·len:·101,·SHA:·d670ec9a80567ad673fa1aea8601ea0c682a17fb46a39485d4659e4da656e178·...·]-16">)</span><span·class="p">;</span><span·class="w">362 ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-16">(</span><span·class="p"·data-group-id="9935432943-17">[</span><span·class="p"·data-group-id="9935432943-17">]</span><span·class="p">,</span><span·class="p"·data-group-id="9935432943-18">[</span><span·class="p"·data-group-id="9935432943-18">][·...·truncated·by·diffoscope;·len:·101,·SHA:·5eb68c2e6fb3bbbd392bbfcc72ba6ed45d5231657b5358ffa29df0bb78ab0cb5·...·]-16">)</span><span·class="p">;</span><span·class="w">
363 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-19">(</span><span·class="p"·data-group-id="6499843725-20">[</span><span·class="p"·data-group-id="6499843725-20">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-21">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·151,·SHA:·d6a1ef20b4fdc50024a951c417bc9878d2d94fc27811c35a644131b53125938d·...·]-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">363 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-19">(</span><span·class="p"·data-group-id="9935432943-20">[</span><span·class="p"·data-group-id="9935432943-20">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-21">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·151,·SHA:·162432538886e70768f6aec7869aed8dea1aa2374cfb031e026b9133d2ffd8e1·...·]-19">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
364 ····</span><span·class="n">ReportTo</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-22">{</span><span·class="ss">done</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6499843725-23">(</span><span·class="p"·data-group-id="6499843725-23">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·d1af34541c000aced1dbfc1aca3d38dd995fec7cd7508f9aeb0b298fe5105d10·...·]-22">}</span><span·class="p">,</span><span·class="w">364 ····</span><span·class="n">ReportTo</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-22">{</span><span·class="ss">done</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="9935432943-23">(</span><span·class="p"·data-group-id="9935432943-23">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·a0eb7bae850b89c914fc4e00bb5097bcd1e6d577b8dd1e651b581f1742e79e1e·...·]-22">}</span><span·class="p">,</span><span·class="w">
365 ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-24">(</span><span·class="p"·data-group-id="6499843725-25">[</span><span·class="p"·data-group-id="6499843725-25">]</span><span·class="p">,</span><span·class="p"·data-group-id="6499843725-26">[</span><span·class="p"·data-group-id="6499843725-26">]</span><span·class="p">,</span><span·class="ss">false</span><span·class="p"·data-group-id="6499843725-24">)</span><span·class="p">;</span><span·class="w"> 
366 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-27">(</span><span·class="p"·data-group-id="6499843725-28">[</span><span·class="p"·data-group-id="6499843725-28">]</span><span·class="p">,</span><span·class="w">·</span><span·cla[·...·truncated·by·diffoscope;·len:·453,·SHA:·8e0f535ae19fef092ca3de1f66cd3905369799d948a728b6311e889649be26ea·...·];</span><span·class="w">365 ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-24">(</span><span·class="p"·data-group-id="9935432943-25">[</span><span·class="p"·data-group-id="9935432943-25">]</span><span·class="p">,</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·202,·SHA:·f8507107ccb830bd4df2e6796ad6dc11644b48a328d2021b76dec3b2953d770c·...·];</span><span·class="w">
 366 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-27">(</span><span·class="p"·data-group-id="9935432943-28">[</span><span·class="p"·data-group-id="9935432943-28">]</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-29">[</span><span·class="n">Po</span><span·class="p">|</span><span·class="n">Pos</span><span·class="p"·data-group-id="9935432943-29">]</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">Pongers</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReportTo</span><span·class="p"·data-group-id="9935432943-27">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
367 ····</span><span·class="k">receive</span><span·class="w">367 ····</span><span·class="k">receive</span><span·class="w">
368 »       </span><span·class="p"·data-group-id="6499843725-30">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="6499843725-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">368 »       </span><span·class="p"·data-group-id="9935432943-30">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="9935432943-30">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
369 »       ····</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-31">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6499843725-32">(</span><span·class="p"·data-group-id="6499843725-32">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·d1af34541c000aced1dbfc1aca3d38dd995fec7cd7508f9aeb0b298fe5105d10·...·]-31">}</span><span·class="p">,</span><span·class="w">369 »       ····</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-31">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="9935432943-32">(</span><span·class="p"·data-group-id="9935432943-32">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·a0eb7bae850b89c914fc4e00bb5097bcd1e6d577b8dd1e651b581f1742e79e1e·...·]-31">}</span><span·class="p">,</span><span·class="w">
370 »       ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-33">(</span><span·class="p"·data-group-id="6499843725-34">[</span><span·class="p"·data-group-id="6499843725-34">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pongers</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·73,·SHA:·78bec94d5cbaa17b0e3202ac2fc2be2dc868d94f71c1e6b4ef0e168be6cd6485·...·]-33">)</span><span·class="p">;</span><span·class="w">370 »       ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-33">(</span><span·class="p"·data-group-id="9935432943-34">[</span><span·class="p"·data-group-id="9935432943-34">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pongers</span><span·class="p">,</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·73,·SHA:·8db4b2712da917ae3751f9996b1b134105275de9e8fdd033ebba7b9c55b6f9fd·...·]-33">)</span><span·class="p">;</span><span·class="w">
371 »       </span><span·class="p"·data-group-id="6499843725-35">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Po</span><span·class="p"·data-group-id="6499843725-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">371 »       </span><span·class="p"·data-group-id="9935432943-35">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Po</span><span·class="p"·data-group-id="9935432943-35">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
372 »       ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-36">(</span><span·class="p"·data-group-id="6499843725-37">[</span><span·class="p"·data-group-id="6499843725-37">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pos</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·69,·SHA:·87c96630c091713660ca0476c3198dcc413673e5932223483013dfaeb0f09801·...·]-36">)</span><span·class="w">372 »       ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-36">(</span><span·class="p"·data-group-id="9935432943-37">[</span><span·class="p"·data-group-id="9935432943-37">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pos</span><span·class="p">,</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·69,·SHA:·3a5d3288a63a83f07eedb835c8406438854a04c9212201480b8fbc7e1425b7e8·...·]-36">)</span><span·class="w">
373 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">373 ····</span><span·class="k">end</span><span·class="p">;</span><span·class="w">
374 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-38">(</span><span·class="p"·data-group-id="6499843725-39">[</span><span·class="n">Pi</span><span·class="p">|</span><span·class="n">Pis</span><span·class="p"·data-group-id="6499843725-39">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Pongers</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReportTo</span><span·class="p"·data-group-id="6499843725-38">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w"> 
375 ····</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-40">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="649[·...·truncated·by·diffoscope;·len:·508,·SHA:·712da9bf8a542f8aa512144adc60d055fd5c428eb718639688881fcd5b066dfc·...·]</span><span·class="w">374 </span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-38">(</span><span·class="p"·data-group-id="9935432943-39">[</span><span·class="n">Pi</span><span·class="p">|</span><span·class="n">Pis</span><span·class="p"·data-group-id="99354[·...·truncated·by·diffoscope;·len:·274,·SHA:·e99027931c83a798586de5aa0d368825b6bac299b1638f88113a2c356420361d·...·]</span><span·class="w">
 375 ····</span><span·class="k">receive</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-40">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="n">From</span><span·class="p"·data-group-id="9935432943-40">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">From</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-41">{</span><span·class="ss">pong</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="9935432943-42">(</span><span·class="p"·data-group-id="9935432943-42">)</span><span·class="p"·data-group-id="9935432943-41">}</span><span·class="w">
376 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">376 ····</span><span·class="k">after</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="w">
377 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">377 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
378 ····</span><span·class="n">Pi</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-43">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="6499843725-44">(</span><span·class="p"·data-group-id="6499843725-44">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·d1af34541c000aced1dbfc1aca3d38dd995fec7cd7508f9aeb0b298fe5105d10·...·]-43">}</span><span·class="p">,</span><span·class="w">378 ····</span><span·class="n">Pi</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-43">{</span><span·class="ss">ping</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="9935432943-44">(</span><span·class="p"·data-group-id="9935432943-44">)</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·a0eb7bae850b89c914fc4e00bb5097bcd1e6d577b8dd1e651b581f1742e79e1e·...·]-43">}</span><span·class="p">,</span><span·class="w">
379 ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="6499843725-45">(</span><span·class="n">Pis</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-46">[</span><span·class="n">Pi</span><span·class="p">|</span><span·class="n">Pongers</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·148,·SHA:·a514ebcfb47230240a5416c11854d8b33ec6c254d650b344afd914b19ef03f4c·...·]-45">)</span><span·class="p">.</span><span·class="w">379 ····</span><span·class="nf">pinger</span><span·class="p"·data-group-id="9935432943-45">(</span><span·class="n">Pis</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-46">[</span><span·class="n">Pi</span><span·class="p">|</span><span·class="n">Pongers</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·148,·SHA:·50ba9efb33db7b63940bd26e01b8da32b75f42695bc79ff2df219e789051d4ed·...·]-45">)</span><span·class="p">.</span><span·class="w">
  
380 </span><span·class="nf">spawn_procs</span><span·class="p"·data-group-id="6499843725-47">(</span><span·class="n">N</span><span·class="p"·data-group-id="6499843725-47">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">380 </span><span·class="nf">spawn_procs</span><span·class="p"·data-group-id="9935432943-47">(</span><span·class="n">N</span><span·class="p"·data-group-id="9935432943-47">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="n">N</span><span·class="w">·</span><span·class="o">=&lt;</span><span·class="w">·</span><span·class="mi">0</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
381 ····</span><span·class="p"·data-group-id="6499843725-48">[</span><span·class="p"·data-group-id="6499843725-48">]</span><span·class="p">;</span><span·class="w">381 ····</span><span·class="p"·data-group-id="9935432943-48">[</span><span·class="p"·data-group-id="9935432943-48">]</span><span·class="p">;</span><span·class="w">
382 </span><span·class="nf">spawn_procs</span><span·class="p"·data-group-id="6499843725-49">(</span><span·class="n">N</span><span·class="p"·data-group-id="6499843725-49">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">382 </span><span·class="nf">spawn_procs</span><span·class="p"·data-group-id="9935432943-49">(</span><span·class="n">N</span><span·class="p"·data-group-id="9935432943-49">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
383 ····</span><span·class="p"·data-group-id="6499843725-50">[</span><span·class="nf">spawn_link</span><span·class="p"·data-group-id="6499843725-51">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-52">(</span><span·class="p"·data-group-id="649984372[·...·truncated·by·diffoscope;·len:·953,·SHA:·e4bd30f6c55e5ca638eab55b079bdfeff7851de5281dae6bcfd7c65a35992ec4·...·]-50">]</span><span·class="p">.</span><span·class="w">383 ····</span><span·class="p"·data-group-id="9935432943-50">[</span><span·class="nf">spawn_link</span><span·class="p"·data-group-id="9935432943-51">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-52">(</span><span·class="p"·data-group-id="993543294[·...·truncated·by·diffoscope;·len:·953,·SHA:·5966310e4d02bc4039cfd02b2ae93b1d7772861afbc88c7ec26452c2c2bbb9a3·...·]-50">]</span><span·class="p">.</span><span·class="w">
  
384 </span><span·class="nf">send_procs</span><span·class="p"·data-group-id="6499843725-57">(</span><span·class="p"·data-group-id="6499843725-58">[</span><span·class="p"·data-group-id="6499843725-58">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="6499843725-57">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">384 </span><span·class="nf">send_procs</span><span·class="p"·data-group-id="9935432943-57">(</span><span·class="p"·data-group-id="9935432943-58">[</span><span·class="p"·data-group-id="9935432943-58">]</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="9935432943-57">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
385 ····</span><span·class="n">Msg</span><span·class="p">;</span><span·class="w">385 ····</span><span·class="n">Msg</span><span·class="p">;</span><span·class="w">
386 </span><span·class="nf">send_procs</span><span·class="p"·data-group-id="6499843725-59">(</span><span·class="p"·data-group-id="6499843725-60">[</span><span·class="n">P</span><span·class="p">|</span><span·class="n">Ps</span><span·class="p"·data-group-id="6499843725-60">]</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·63,·SHA:·d4f3c677e1c6b3a83a829bf7f35d7181ca75a49d7d495de96d8431379499dcb7·...·]-59">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">386 </span><span·class="nf">send_procs</span><span·class="p"·data-group-id="9935432943-59">(</span><span·class="p"·data-group-id="9935432943-60">[</span><span·class="n">P</span><span·class="p">|</span><span·class="n">Ps</span><span·class="p"·data-group-id="9935432943-60">]</span><span·class="p">,</span><span·class="w">·</span><spa[·...·truncated·by·diffoscope;·len:·63,·SHA:·5e8d47760d719ebbf2b7752ca945e8a05cd5ec6019e2fbcceb576bdd114e62bd·...·]-59">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
387 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">387 ····</span><span·class="n">P</span><span·class="w">·</span><span·class="o">!</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p">,</span><span·class="w">
388 ····</span><span·class="nf">send_procs</span><span·class="p"·data-group-id="6499843725-61">(</span><span·class="n">Ps</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="6499843725-61">)</span><span·class="p">.</span><span·class="w">388 ····</span><span·class="nf">send_procs</span><span·class="p"·data-group-id="9935432943-61">(</span><span·class="n">Ps</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="9935432943-61">)</span><span·class="p">.</span><span·class="w">
  
389 </span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="6499843725-62">(</span><span·class="p"·data-group-id="6499843725-63">[</span><span·class="p"·data-group-id="6499843725-63">]</span><span·class="p"·data-group-id="6499843725-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">389 </span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="9935432943-62">(</span><span·class="p"·data-group-id="9935432943-63">[</span><span·class="p"·data-group-id="9935432943-63">]</span><span·class="p"·data-group-id="9935432943-62">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
390 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">390 ····</span><span·class="ss">ok</span><span·class="p">;</span><span·class="w">
391 </span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="6499843725-64">(</span><span·class="p"·data-group-id="6499843725-65">[</span><span·class="n">M</span><span·class="p">|</span><span·class="n">Ms</span><span·class="p"·data-group-id="6499843725-65">]</span><span·class="p"·data-group-id="6499843725-64">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">391 </span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="9935432943-64">(</span><span·class="p"·data-group-id="9935432943-65">[</span><span·class="n">M</span><span·class="p">|</span><span·class="n">Ms</span><span·class="p"·data-group-id="9935432943-65">]</span><span·class="p"·data-group-id="9935432943-64">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
392 ····</span><span·class="k">receive</span><span·class="w">392 ····</span><span·class="k">receive</span><span·class="w">
393 »       </span><span·class="n">M</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">393 »       </span><span·class="n">M</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
394 »       ····</span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="6499843725-66">(</span><span·class="n">Ms</span><span·class="p"·data-group-id="6499843725-66">)</span><span·class="w">394 »       ····</span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="9935432943-66">(</span><span·class="n">Ms</span><span·class="p"·data-group-id="9935432943-66">)</span><span·class="w">
395 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">395 ····</span><span·class="k">end</span><span·class="p">.</span><span·class="w">
  
396 </span><span·class="nf">bang</span><span·class="p"·data-group-id="6499843725-67">(</span><span·class="n">N</span><span·class="p"·data-group-id="6499843725-67">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="6499843725-68">(</[·...·truncated·by·diffoscope;·len:·70,·SHA:·1560915922be8539084a52b63c8d73a1940f898ebf9d30d912c0cc88bdeee145·...·]-68">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">396 </span><span·class="nf">bang</span><span·class="p"·data-group-id="9935432943-67">(</span><span·class="n">N</span><span·class="p"·data-group-id="9935432943-67">)</span><span·class="w">·</span><span·class="k">when</span><span·class="w">·</span><span·class="nf">integer</span><span·class="p"·data-group-id="9935432943-68">(</[·...·truncated·by·diffoscope;·len:·70,·SHA:·886ee21f5ed7e5a7d06fa5c7cd84a153bc21d4be8d95e8b49b9cadf7afb9e6a9·...·]-68">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
397 ····</span><span·class="n">Procs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn_procs</span><span·class="p"·data-group-id="6499843725-69">(</span><span·class="n">N</span><span·class="p"·data-group-id="6499843725-69">)</span><span·class="p">,</span><span·class="w">397 ····</span><span·class="n">Procs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">spawn_procs</span><span·class="p"·data-group-id="9935432943-69">(</span><span·class="n">N</span><span·class="p"·data-group-id="9935432943-69">)</span><span·class="p">,</span><span·class="w">
398 ····</span><span·class="n">RMsgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="6499843725-70">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-71">(</span><span·class="n">P</span><span·class="p"·data-group-id="6499843725-71">)</span><span·class="w">·</span><span·class="p">-&gt;</spa[·...·truncated·by·diffoscope;·len:·401,·SHA:·4d0bc56705a0a0de61646c74f98a0a176835b39db83fa22ebd02e845076c41ea·...·]-70">)</span><span·class="p">,</span><span·class="w">398 ····</span><span·class="n">RMsgs</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">map</span><span·class="p"·data-group-id="9935432943-70">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-71">(</span><span·class="n">P</span><span·class="p"·data-group-id="9935432943-71">)</span><span·class="w">·</span><span·class="p">-&gt;</spa[·...·truncated·by·diffoscope;·len:·401,·SHA:·e01eaada458fc64d9884ba76431358a3927510c46f830ad75953937d0ede9f21·...·]-70">)</span><span·class="p">,</span><span·class="w">
399 ····</span><span·class="n">Start</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">now</span><span·class="p"·data-group-id="6499843725-73">(</span><span·class="p"·data-group-id="6499843725-73">)</span><span·class="p">,</span><span·class="w">399 ····</span><span·class="n">Start</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">now</span><span·class="p"·data-group-id="9935432943-73">(</span><span·class="p"·data-group-id="9935432943-73">)</span><span·class="p">,</span><span·class="w">
400 ····</span><span·class="nf">send_procs</span><span·class="p"·data-group-id="6499843725-74">(</span><span·class="n">Procs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-75">{</span><span·class="ss">procs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Procs</spa[·...·truncated·by·diffoscope;·len:·281,·SHA:·c4ae752e2318f2780a9780b1992860cd22c81d31a12a62761e8c1b6674b4af76·...·]-74">)</span><span·class="p">,</span><span·class="w">400 ····</span><span·class="nf">send_procs</span><span·class="p"·data-group-id="9935432943-74">(</span><span·class="n">Procs</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-75">{</span><span·class="ss">procs</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Procs</spa[·...·truncated·by·diffoscope;·len:·281,·SHA:·50257d939b99d3d6230ff44e4fc65d8ce549090c2e1a07245bf927aabcbc7469·...·]-74">)</span><span·class="p">,</span><span·class="w">
401 ····</span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="6499843725-77">(</span><span·class="n">RMsgs</span><span·class="p"·data-group-id="6499843725-77">)</span><span·class="p">,</span><span·class="w">401 ····</span><span·class="nf">receive_msgs</span><span·class="p"·data-group-id="9935432943-77">(</span><span·class="n">RMsgs</span><span·class="p"·data-group-id="9935432943-77">)</span><span·class="p">,</span><span·class="w">
402 ····</span><span·class="n">Stop</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">now</span><span·class="p"·data-group-id="6499843725-78">(</span><span·class="p"·data-group-id="6499843725-78">)</span><span·class="p">,</span><span·class="w">402 ····</span><span·class="n">Stop</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">now</span><span·class="p"·data-group-id="9935432943-78">(</span><span·class="p"·data-group-id="9935432943-78">)</span><span·class="p">,</span><span·class="w">
403 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foreach</span><span·class="p"·data-group-id="6499843725-79">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="6499843725-80">(</span><span·class="n">P</span><span·class="p"·data-group-id="6499843725-80">)</span><span·class="w">·</span><span·class="p">-&gt;</spa[·...·truncated·by·diffoscope;·len:·431,·SHA:·2f9cb3417be5ee1b06b6acd9dc7cd6784228371a8e68f6348e1c096567c0c01c·...·]-79">)</span><span·class="p">,</span><span·class="w">403 ····</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foreach</span><span·class="p"·data-group-id="9935432943-79">(</span><span·class="nf">fun</span><span·class="w">·</span><span·class="p"·data-group-id="9935432943-80">(</span><span·class="n">P</span><span·class="p"·data-group-id="9935432943-80">)</span><span·class="w">·</span><span·class="p">-&gt;</spa[·...·truncated·by·diffoscope;·len:·431,·SHA:·1dcdd5f46eedd6ff53d010b6cfbc5f00d8ab6c00fe3c297e3fc4d03a5d802cd3·...·]-79">)</span><span·class="p">,</span><span·class="w">
404 ····</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">now_diff</span><span·class="p"·data-group-id="6499843725-82">(</span><span·class="n">Stop</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Start</span><span·class="p"·data-group-id="6499843725-82">)</span><span·class="p">.</span></code></pre><h2·id="see-also"·class="section-heading">404 ····</span><span·class="nc">timer</span><span·class="p">:</span><span·class="nf">now_diff</span><span·class="p"·data-group-id="9935432943-82">(</span><span·class="n">Stop</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Start</span><span·class="p"·data-group-id="9935432943-82">)</span><span·class="p">.</span></code></pre><h2·id="see-also"·class="section-heading">
405 ··<a·href="#see-also"·class="hover-link">405 ··<a·href="#see-also"·class="hover-link">
406 ····<i·class="ri-link-m"·aria-hidden="true"></i>406 ····<i·class="ri-link-m"·aria-hidden="true"></i>
407 ··</a>407 ··</a>
408 ··<span·class="text">See·Also</span>408 ··<span·class="text">See·Also</span>
409 </h2>409 </h2>
410 <p><a·href="lcnt.html">LCNT·Reference·Manual</a></p>410 <p><a·href="lcnt.html">LCNT·Reference·Manual</a></p>
411 </div>411 </div>
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459 ······<p·class="built-using">459 ······<p·class="built-using">
460 ········Built·using460 ········Built·using
461 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the461 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
462 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>462 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
463 ······</p>463 ······</p>
464 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>464 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
465 ····</footer>465 ····</footer>
466 ··</div>466 ··</div>
467 </main>467 </main>
468 </div>468 </div>
469 <script>469 <script>
470 ··function·mermaidLoaded()·{470 ··function·mermaidLoaded()·{
471 ····mermaid.initialize({471 ····mermaid.initialize({
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./usr/share/doc/erlang-doc/html/lib/tools-4.1.1/doc/html/make.html
    
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138 <p><a·href="#all/1"><code·class="inline">make:all/0,1</code></a>·and·<a·href="#files/2"><code·class="inline">make:files/1,2</code></a>·first·looks·for138 <p><a·href="#all/1"><code·class="inline">make:all/0,1</code></a>·and·<a·href="#files/2"><code·class="inline">make:files/1,2</code></a>·first·looks·for
139 <code·class="inline">{emake,·Emake}</code>·in·options,·then·in·the·current·working·directory·for·a·file139 <code·class="inline">{emake,·Emake}</code>·in·options,·then·in·the·current·working·directory·for·a·file
140 named·<code·class="inline">Emakefile</code>.·If·present·<code·class="inline">Emake</code>·should·contain·elements·like·this:</p><pre><code·class="text">Modules.140 named·<code·class="inline">Emakefile</code>.·If·present·<code·class="inline">Emake</code>·should·contain·elements·like·this:</p><pre><code·class="text">Modules.
141 {Modules,Options}.</code></pre><p><code·class="inline">Modules</code>·is·an·atom·or·a·list·of·atoms.·It·can·be</p><ul><li>a·module·name,·for·exmaple,··<code·class="inline">file1</code></li><li>a·module·name·in·another·directory,·for·exmaple,·<code·class="inline">'../foo/file3'</code></li><li>a·set·of·modules·specified·with·a·wildcards,·for·exmaple,·<code·class="inline">'file*'</code></li><li>a·wildcard·indicating·all·modules·in·current·directory,·that·is:·<code·class="inline">'*'</code></li><li>a·list·of·any·of·the·above,·for·exmaple,·<code·class="inline">['file*','../foo/file3','File4']</code></li></ul><p><code·class="inline">Options</code>·is·a·list·of·compiler·options.</p><p><code·class="inline">Emakefile</code>·is·read·from·top·to·bottom.·If·a·module·matches·more·than·one·entry,141 {Modules,Options}.</code></pre><p><code·class="inline">Modules</code>·is·an·atom·or·a·list·of·atoms.·It·can·be</p><ul><li>a·module·name,·for·exmaple,··<code·class="inline">file1</code></li><li>a·module·name·in·another·directory,·for·exmaple,·<code·class="inline">'../foo/file3'</code></li><li>a·set·of·modules·specified·with·a·wildcards,·for·exmaple,·<code·class="inline">'file*'</code></li><li>a·wildcard·indicating·all·modules·in·current·directory,·that·is:·<code·class="inline">'*'</code></li><li>a·list·of·any·of·the·above,·for·exmaple,·<code·class="inline">['file*','../foo/file3','File4']</code></li></ul><p><code·class="inline">Options</code>·is·a·list·of·compiler·options.</p><p><code·class="inline">Emakefile</code>·is·read·from·top·to·bottom.·If·a·module·matches·more·than·one·entry,
142 the·first·match·is·used.·For·example,·the·following·<code·class="inline">Emakefile</code>·means·that142 the·first·match·is·used.·For·example,·the·following·<code·class="inline">Emakefile</code>·means·that
143 <code·class="inline">file1</code>·should·be·compiled·with·the·options·<code·class="inline">[debug_info,{i,&quot;../foo&quot;}]</code>,·while143 <code·class="inline">file1</code>·should·be·compiled·with·the·options·<code·class="inline">[debug_info,{i,&quot;../foo&quot;}]</code>,·while
144 all·other·files·in·the·current·directory·should·be·compiled·with·only·the144 all·other·files·in·the·current·directory·should·be·compiled·with·only·the
145 <code·class="inline">debug_info</code>·flag.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4479121988-1">{</span><span·class="ss">&#39;file1&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4479121988-2">[</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="p"·data-group-id="4479121988-3">{</span><span·cl[·...·truncated·by·diffoscope;·len:·229,·SHA:·9859af9a04fb16144cca3d7a513f4f69ded98515e18f409bee38e8145636083f·...·]-1">}</span><span·class="p">.</span><span·class="w">145 <code·class="inline">debug_info</code>·flag.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="4027456534-1">{</span><span·class="ss">&#39;file1&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4027456534-2">[</span><span·class="ss">debug_info</span><span·class="p">,</span><span·class="p"·data-group-id="4027456534-3">{</span><span·cl[·...·truncated·by·diffoscope;·len:·229,·SHA:·1350fd30ca123fb4d3e8c26188cb831da71a8225890817695b86113361d445e9·...·]-1">}</span><span·class="p">.</span><span·class="w">
146 </span><span·class="p"·data-group-id="4479121988-4">{</span><span·class="ss">&#39;*&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4479121988-5">[</span><span·class="ss">debug_info</span><span·class="p"·data-group-id="4479121988-5">]</span><span·class="p"·data-group-id="44791[·...·truncated·by·diffoscope;·len:·5,·SHA:·e11e86fd30b080bcdd2ee4fcfc0b319ef20fe9decec1c0358534ec4b344b22d6·...·]-4">}</span><span·class="p">.</span></code></pre><h2·id="module-see-also"·class="section-heading">146 </span><span·class="p"·data-group-id="4027456534-4">{</span><span·class="ss">&#39;*&#39;</span><span·class="p">,</span><span·class="p"·data-group-id="4027456534-5">[</span><span·class="ss">debug_info</span><span·class="p"·data-group-id="4027456534-5">]</span><span·class="p"·data-group-id="40274[·...·truncated·by·diffoscope;·len:·5,·SHA:·277a724b02cd2e28c6af9b51724e5275c92d54745e83582a357a7112cda67c82·...·]-4">}</span><span·class="p">.</span></code></pre><h2·id="module-see-also"·class="section-heading">
147 ··<a·href="#module-see-also"·class="hover-link">147 ··<a·href="#module-see-also"·class="hover-link">
148 ····<i·class="ri-link-m"·aria-hidden="true"></i>148 ····<i·class="ri-link-m"·aria-hidden="true"></i>
149 ··</a>149 ··</a>
150 ··<span·class="text">See·Also</span>150 ··<span·class="text">See·Also</span>
151 </h2>151 </h2>
152 <p><a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html">The·Compiler·Application</a></p>152 <p><a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html">The·Compiler·Application</a></p>
153 ····</section>153 ····</section>
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378 ······<p·class="built-using">378 ······<p·class="built-using">
379 ········Built·using379 ········Built·using
380 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the380 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
381 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>381 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
382 ······</p>382 ······</p>
383 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>383 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
384 ····</footer>384 ····</footer>
385 ··</div>385 ··</div>
386 </main>386 </main>
387 </div>387 </div>
388 <script>388 <script>
389 ··function·mermaidLoaded()·{389 ··function·mermaidLoaded()·{
390 ····mermaid.initialize({390 ····mermaid.initialize({
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163 </h2>163 </h2>
164 <h3·id="fixed-bugs-and-malfunctions-2"·class="section-heading">164 <h3·id="fixed-bugs-and-malfunctions-2"·class="section-heading">
165 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">165 ··<a·href="#fixed-bugs-and-malfunctions-2"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>168 ··<span·class="text">Fixed·Bugs·and·Malfunctions</span>
169 </h3>169 </h3>
170 <ul><li><p>Dialyzer·warnings·due·to·type·specs·added·in·<a·href="../../../../lib/runtime_tools-2.1.1/doc/html/dbg.html"><code·class="inline">dbg</code></a>·have·been·eliminated.</p><p>Own·Id:·OTP-18860</p></li><li><p>In·Erlang/OTP·26,·doing·a·<a·href="cover.html"><code·class="inline">cover</code></a>·analysis·on·the·<code·class="inline">line</code>·level·would·return·multiple·entries·for·lines·on·which·multiple·functions·were·defined.</p><p>For·example,·consider·this·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8070859335-1">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="8070859335-1">)</span><span·class="p">.</span><span·class="w">170 <ul><li><p>Dialyzer·warnings·due·to·type·specs·added·in·<a·href="../../../../lib/runtime_tools-2.1.1/doc/html/dbg.html"><code·class="inline">dbg</code></a>·have·been·eliminated.</p><p>Own·Id:·OTP-18860</p></li><li><p>In·Erlang/OTP·26,·doing·a·<a·href="cover.html"><code·class="inline">cover</code></a>·analysis·on·the·<code·class="inline">line</code>·level·would·return·multiple·entries·for·lines·on·which·multiple·functions·were·defined.</p><p>For·example,·consider·this·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5335746896-1">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="5335746896-1">)</span><span·class="p">.</span><span·class="w">
171 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8070859335-2">(</span><span·class="p"·data-group-id="8070859335-3">[</span><span·class="ss">bar</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">baz</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·de2c5ccd9e082999d844fd80f021945f72a7101a60ae604d6bff3ae686b61dd7·...·]-2">)</span><span·class="p">.</span><span·class="w">171 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5335746896-2">(</span><span·class="p"·data-group-id="5335746896-3">[</span><span·class="ss">bar</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">baz</span><span·class="p">/</span><span·[·...·truncated·by·diffoscope;·len:·113,·SHA:·44dc0fa6aacf1bd6c5044dadb093e395ebbb1f675b0fe30647e8a840f8bfb508·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
172 </span><span·class="nf">bar</span><span·class="p"·data-group-id="8070859335-4">(</span><span·class="p"·data-group-id="8070859335-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">·</span><span·class="nf">baz</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·53ce341d3037dca1f101b5c105b3f468f47f594247284434879dd3a76f216c0c·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">not_ok</span><span·class="p">.</span></code></pre><p>In·Erlang/OTP·26,·analysing·on·the·<code·class="inline">line</code>·level·would·return·two·entries172 </span><span·class="nf">bar</span><span·class="p"·data-group-id="5335746896-4">(</span><span·class="p"·data-group-id="5335746896-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">.</span><span·class="w">·</span><span·class="nf">baz</span><spa[·...·truncated·by·diffoscope;·len:·90,·SHA:·a6a0ce364f374174f17856f7e581facded88d48a66954173efd94b35531d0cee·...·]-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="ss">not_ok</span><span·class="p">.</span></code></pre><p>In·Erlang/OTP·26,·analysing·on·the·<code·class="inline">line</code>·level·would·return·two·entries
173 for·line·4:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">compile_module</span><span·class="p"·data-group-id="1426391266-1">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="1426391266-1">)</span><span·class="p">.</span><span·class="w">173 for·line·4:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">compile_module</span><span·class="p"·data-group-id="3267338105-1">(</span><span·class="ss">foo</span><span·class="p"·data-group-id="3267338105-1">)</span><span·class="p">.</span><span·class="w">
174 </span><span·class="p"·data-group-id="1426391266-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">foo</span><span·class="p"·data-group-id="1426391266-2">}</span><span·class="gp·unselectable">174 </span><span·class="p"·data-group-id="3267338105-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">foo</span><span·class="p"·data-group-id="3267338105-2">}</span><span·class="gp·unselectable">
175 2&gt;·</span><span·class="nc">foo</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="1426391266-3">(</span><span·class="p"·data-group-id="1426391266-3">)</span><span·class="p">.</span><span·class="w">175 2&gt;·</span><span·class="nc">foo</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="3267338105-3">(</span><span·class="p"·data-group-id="3267338105-3">)</span><span·class="p">.</span><span·class="w">
176 </span><span·class="ss">ok</span><span·class="gp·unselectable">176 </span><span·class="ss">ok</span><span·class="gp·unselectable">
177 3&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="1426391266-4">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="1426391266-4">)</span><span·class="p">.</span><span·class="w">177 3&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="3267338105-4">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="3267338105-4">)</span><span·class="p">.</span><span·class="w">
178 </span><span·class="p"·data-group-id="1426391266-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1426391266-6">[</span><span·class="p"·data-group-id="1426391266-7">{</span><span·class="p"·data-group-id="1426391266-8">{</span><span·class="ss">foo</spa[·...·truncated·by·diffoscope;·len:·977,·SHA:·6094ac9d049c18a9094cf7ca0a1e56b5460a797649815fd7c3d0dd2234699b82·...·]-5">}</span><span·class="gp·unselectable">178 </span><span·class="p"·data-group-id="3267338105-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3267338105-6">[</span><span·class="p"·data-group-id="3267338105-7">{</span><span·class="p"·data-group-id="3267338105-8">{</span><span·class="ss">foo</spa[·...·truncated·by·diffoscope;·len:·977,·SHA:·a4e3cd0f59167b8fb652ba3bfd4cdab69e699d2c55d144deffd871f964894d2a·...·]-5">}</span><span·class="gp·unselectable">
179 4&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="1426391266-13">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">calls</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="1426391266-13">)</span><span·class="p">.</span><span·class="w">179 4&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="3267338105-13">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">calls</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="3267338105-13">)</span><span·class="p">.</span><span·class="w">
180 </span><span·class="p"·data-group-id="1426391266-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="1426391266-15">[</span><span·class="p"·data-group-id="1426391266-16">{</span><span·class="p"·data-group-id="1426391266-17">{</span><span·class="ss">foo<[·...·truncated·by·diffoscope;·len:·1071,·SHA:·062bbeff39cadaa76a9316aa95b1a36e68e1cafc752a7dcfc07cf2f498817d07·...·]-1">)</span><span·class="p">.</span><span·class="w">180 </span><span·class="p"·data-group-id="3267338105-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="3267338105-15">[</span><span·class="p"·data-group-id="3267338105-16">{</span><span·class="p"·data-group-id="3267338105-17">{</span><span·class="ss">foo<[·...·truncated·by·diffoscope;·len:·1071,·SHA:·99ad1e91c9cc64c3f30099bab22cee0eb8e108f37fc2a768a20057cd003c8b94·...·]-1">)</span><span·class="p">.</span><span·class="w">
181 </span><span·class="p"·data-group-id="7870308376-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">foo</span><span·class="p"·data-group-id="7870308376-2">}</span><span·class="gp·unselectable">181 </span><span·class="p"·data-group-id="4051934267-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">foo</span><span·class="p"·data-group-id="4051934267-2">}</span><span·class="gp·unselectable">
182 2&gt;·</span><span·class="nc">foo</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="7870308376-3">(</span><span·class="p"·data-group-id="7870308376-3">)</span><span·class="p">.</span><span·class="w">182 2&gt;·</span><span·class="nc">foo</span><span·class="p">:</span><span·class="nf">bar</span><span·class="p"·data-group-id="4051934267-3">(</span><span·class="p"·data-group-id="4051934267-3">)</span><span·class="p">.</span><span·class="w">
183 </span><span·class="ss">ok</span><span·class="gp·unselectable">183 </span><span·class="ss">ok</span><span·class="gp·unselectable">
184 3&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="7870308376-4">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="7870308376-4">)</span><span·class="p">.</span><span·class="w">184 3&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="4051934267-4">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">coverage</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="4051934267-4">)</span><span·class="p">.</span><span·class="w">
185 </span><span·class="p"·data-group-id="7870308376-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7870308376-6">[</span><span·class="p"·data-group-id="7870308376-7">{</span><span·class="p"·data-group-id="7870308376-8">{</span><span·class="ss">foo</spa[·...·truncated·by·diffoscope;·len:·455,·SHA:·061a5a4585c0a8361913b27239ff867c7fafa87e8652e71cae108e2f8c8c0d3f·...·]-5">}</span><span·class="gp·unselectable">185 </span><span·class="p"·data-group-id="4051934267-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4051934267-6">[</span><span·class="p"·data-group-id="4051934267-7">{</span><span·class="p"·data-group-id="4051934267-8">{</span><span·class="ss">foo</spa[·...·truncated·by·diffoscope;·len:·455,·SHA:·7282e4ebda2bfcdf1cc5bd9d9ab123532e2026ceefe660a5c0a5ce8ccb815ca8·...·]-5">}</span><span·class="gp·unselectable">
186 4&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="7870308376-10">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">calls</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="7870308376-10">)</span><span·class="p">.</span><span·class="w">186 4&gt;·</span><span·class="nc">cover</span><span·class="p">:</span><span·class="nf">analyse</span><span·class="p"·data-group-id="4051934267-10">(</span><span·class="ss">foo</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">calls</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">line</span><span·class="p"·data-group-id="4051934267-10">)</span><span·class="p">.</span><span·class="w">
187 </span><span·class="p"·data-group-id="7870308376-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7870308376-12">[</span><span·class="p"·data-group-id="7870308376-13">{</span><span·class="p"·data-group-id="7870308376-14">{</span><span·class="ss">foo<[·...·truncated·by·diffoscope;·len:·307,·SHA:·a900468562ba26e5baa353189a55e20a5126735da2a992399ce58d34c2e79597·...·]-11">}</span></code></pre><p>Own·Id:·OTP-18998·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8159"·title="">GH-8159</a>,·<a·href="https://github.com/erlang/otp/pull/8182"·title="">PR-8182</a></p></li><li><p>Fixed·align·command·in·emacs·mode.</p><p>Own·Id:·OTP-19026·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8155"·title="">PR-8155</a></p></li></ul><h3·id="improvements-and-new-features-1"·class="section-heading">187 </span><span·class="p"·data-group-id="4051934267-11">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="4051934267-12">[</span><span·class="p"·data-group-id="4051934267-13">{</span><span·class="p"·data-group-id="4051934267-14">{</span><span·class="ss">foo<[·...·truncated·by·diffoscope;·len:·307,·SHA:·d9d86ef74d73741d597655553b37ddb92cfe23a1f377e68b94c9896fcae2630f·...·]-11">}</span></code></pre><p>Own·Id:·OTP-18998·Aux·Id:·<a·href="https://github.com/erlang/otp/issues/8159"·title="">GH-8159</a>,·<a·href="https://github.com/erlang/otp/pull/8182"·title="">PR-8182</a></p></li><li><p>Fixed·align·command·in·emacs·mode.</p><p>Own·Id:·OTP-19026·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8155"·title="">PR-8155</a></p></li></ul><h3·id="improvements-and-new-features-1"·class="section-heading">
188 ··<a·href="#improvements-and-new-features-1"·class="hover-link">188 ··<a·href="#improvements-and-new-features-1"·class="hover-link">
189 ····<i·class="ri-link-m"·aria-hidden="true"></i>189 ····<i·class="ri-link-m"·aria-hidden="true"></i>
190 ··</a>190 ··</a>
191 ··<span·class="text">Improvements·and·New·Features</span>191 ··<span·class="text">Improvements·and·New·Features</span>
192 </h3>192 </h3>
193 <ul><li><p>Triple-Quoted·Strings·has·been·implemented·as·per·<a·href="https://www.erlang.org/eeps/eep-0064">EEP·64</a>.·See·<a·href="../../../../doc/system/data_types.html#string">String</a>·in·the·Reference·Manual.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;193 <ul><li><p>Triple-Quoted·Strings·has·been·implemented·as·per·<a·href="https://www.erlang.org/eeps/eep-0064">EEP·64</a>.·See·<a·href="../../../../doc/system/data_types.html#string">String</a>·in·the·Reference·Manual.</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">&quot;&quot;</span><span·class="s">&quot;
194 ···a194 ···a
195 ···b195 ···b
196 ···c196 ···c
197 ···&quot;</span><span·class="s">&quot;&quot;</span><span·class="p">.</span><span·class="w">197 ···&quot;</span><span·class="s">&quot;&quot;</span><span·class="p">.</span><span·class="w">
198 </span><span·class="s">&quot;a\nb\nc&quot;</span></code></pre><p>Adjacent·string·literals·without·intervening·white·space·is·now·a·syntax·error,·to·avoid·possible·confusion·with·triple-quoted·strings.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">&quot;abc&quot;</span><span·class="s">&quot;xyz&quot;</span><span·class="p">.</span><span·class="w">198 </span><span·class="s">&quot;a\nb\nc&quot;</span></code></pre><p>Adjacent·string·literals·without·intervening·white·space·is·now·a·syntax·error,·to·avoid·possible·confusion·with·triple-quoted·strings.·For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="s">&quot;abc&quot;</span><span·class="s">&quot;xyz&quot;</span><span·class="p">.</span><span·class="w">
199 </span><span·class="s">&quot;xyz&quot;</span><span·class="p">.</span><span·class="w">199 </span><span·class="s">&quot;xyz&quot;</span><span·class="p">.</span><span·class="w">
200 </span><span·class="gt">*·1:6:·adjacent·string·literals·without·intervening·white·space</span></code></pre><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18750·Aux·Id:·OTP-18746,·<a·href="https://github.com/erlang/otp/pull/7313"·title="">PR-7313</a>,·<a·href="https://github.com/erlang/otp/pull/7451"·title="">PR-7451</a></p></li><li><p>There·is·a·new·tool·<a·href="tprof.html"><code·class="inline">tprof</code></a>,·which·combines·the·functionality·of·<a·href="eprof.html"><code·class="inline">eprof</code></a>·and·<a·href="cprof.html"><code·class="inline">cprof</code></a>·under·one·interface·and·adds·heap·profiling.·It·also·has·functionality·to·help·with·profiling·process·hierarchies.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="8600191937-1">(</span><span·class="ss">lists</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">seq</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="8600191937-2">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·458,·SHA:·654ccdd793d034c7e5c8ceb62722e56584618ddf94d51be276495b13bbe39fea·...·]-1">)</span><span·class="p">.</span><span·class="w">200 </span><span·class="gt">*·1:6:·adjacent·string·literals·without·intervening·white·space</span></code></pre><p><strong><em>·POTENTIAL·INCOMPATIBILITY·</em></strong></p><p>Own·Id:·OTP-18750·Aux·Id:·OTP-18746,·<a·href="https://github.com/erlang/otp/pull/7313"·title="">PR-7313</a>,·<a·href="https://github.com/erlang/otp/pull/7451"·title="">PR-7451</a></p></li><li><p>There·is·a·new·tool·<a·href="tprof.html"><code·class="inline">tprof</code></a>,·which·combines·the·functionality·of·<a·href="eprof.html"><code·class="inline">eprof</code></a>·and·<a·href="cprof.html"><code·class="inline">cprof</code></a>·under·one·interface·and·adds·heap·profiling.·It·also·has·functionality·to·help·with·profiling·process·hierarchies.</p><p><em>Example</em>:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="4424001253-1">(</span><span·class="ss">lists</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">seq</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4424001253-2">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·458,·SHA:·b3c2a22bee86618a7814a266261ffc91f75a2ce65df83251e1a649836656320a·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
201 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.92</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">201 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.92</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">
202 </span><span·class="n">FUNCTION</span><span·class="w">··········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="8600191937-4">[</span><span·class="w">·····</span><span·class="c1">%]</span><span·class="w">202 </span><span·class="n">FUNCTION</span><span·class="w">··········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="4424001253-4">[</span><span·class="w">·····</span><span·class="c1">%]</span><span·class="w">
203 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="8600191937-5">[</span><span·class="mf">100.00</span><span·class="p"·data-group-id="8600191937-5">]</span><span·class="w">203 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="4424001253-5">[</span><span·class="mf">100.00</span><span·class="p"·data-group-id="4424001253-5">]</span><span·class="w">
204 ····························</span><span·class="mi">32</span><span·class="w">············</span><span·class="p"·data-group-id="8600191937-6">[</span><span·class="w">·</span><span·class="mf">100.0</span><span·class="p"·data-group-id="8600191937-6">]</span><span·class="w">204 ····························</span><span·class="mi">32</span><span·class="w">············</span><span·class="p"·data-group-id="4424001253-6">[</span><span·class="w">·</span><span·class="mf">100.0</span><span·class="p"·data-group-id="4424001253-6">]</span><span·class="w">
205 </span><span·class="ss">ok</span></code></pre><p>Own·Id:·OTP-18756·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/6639"·title="">PR-6639</a></p></li><li><p>Native·coverage·support·has·been·implemented·in·the·JIT.·It·will··automatically·be·used·by·the·<a·href="cover.html"><code·class="inline">cover</code></a>·tool·to·reduce·the·execution·overhead·when·running·cover-compiled·code.</p><p>There·are·also·new·APIs·to·support·native·coverage·without·using·the·<code·class="inline">cover</code>·tool.</p><p>To·instrument·code·for·native·coverage·it·must·be·compiled·with·the·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html#line_coverage"><code·class="inline">line_coverage</code></a>·option.</p><p>To·enable·native·coverage·in·the·runtime·system,·start·it·like·so:</p><pre><code·class="text">$·erl·+JPcover·true</code></pre><p>There·are·also·the·following·new·functions·for·supporting·native·coverage:</p><ul><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#coverage_support/0"><code·class="inline">code:coverage_support/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage/2"><code·class="inline">code:get_coverage/2</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#reset_coverage/1"><code·class="inline">code:reset_coverage/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/0"><code·class="inline">code:get_coverage_mode/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/1"><code·class="inline">code:get_coverage_mode/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#set_coverage_mode/1"><code·class="inline">code:set_coverage_mode/1</code></a></li></ul><p>Own·Id:·OTP-18856·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7856"·title="">PR-7856</a></p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>Improved·the·align·command·in·emacs·mode.</p><p>Own·Id:·OTP-19080·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8288"·title="">PR-8288</a></p></li></ul><h2·id="tools-3-6"·class="section-heading">205 </span><span·class="ss">ok</span></code></pre><p>Own·Id:·OTP-18756·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/6639"·title="">PR-6639</a></p></li><li><p>Native·coverage·support·has·been·implemented·in·the·JIT.·It·will··automatically·be·used·by·the·<a·href="cover.html"><code·class="inline">cover</code></a>·tool·to·reduce·the·execution·overhead·when·running·cover-compiled·code.</p><p>There·are·also·new·APIs·to·support·native·coverage·without·using·the·<code·class="inline">cover</code>·tool.</p><p>To·instrument·code·for·native·coverage·it·must·be·compiled·with·the·<a·href="../../../../lib/compiler-8.6.1/doc/html/compile.html#line_coverage"><code·class="inline">line_coverage</code></a>·option.</p><p>To·enable·native·coverage·in·the·runtime·system,·start·it·like·so:</p><pre><code·class="text">$·erl·+JPcover·true</code></pre><p>There·are·also·the·following·new·functions·for·supporting·native·coverage:</p><ul><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#coverage_support/0"><code·class="inline">code:coverage_support/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage/2"><code·class="inline">code:get_coverage/2</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#reset_coverage/1"><code·class="inline">code:reset_coverage/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/0"><code·class="inline">code:get_coverage_mode/0</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#get_coverage_mode/1"><code·class="inline">code:get_coverage_mode/1</code></a></li><li><a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#set_coverage_mode/1"><code·class="inline">code:set_coverage_mode/1</code></a></li></ul><p>Own·Id:·OTP-18856·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/7856"·title="">PR-7856</a></p></li><li><p>The·documentation·has·been·migrated·to·use·Markdown·and·ExDoc.</p><p>Own·Id:·OTP-18955·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8026"·title="">PR-8026</a></p></li><li><p>Improved·the·align·command·in·emacs·mode.</p><p>Own·Id:·OTP-19080·Aux·Id:·<a·href="https://github.com/erlang/otp/pull/8288"·title="">PR-8288</a></p></li></ul><h2·id="tools-3-6"·class="section-heading">
206 ··<a·href="#tools-3-6"·class="hover-link">206 ··<a·href="#tools-3-6"·class="hover-link">
207 ····<i·class="ri-link-m"·aria-hidden="true"></i>207 ····<i·class="ri-link-m"·aria-hidden="true"></i>
208 ··</a>208 ··</a>
209 ··<span·class="text">Tools·3.6</span>209 ··<span·class="text">Tools·3.6</span>
210 </h2>210 </h2>
211 <h3·id="improvements-and-new-features-2"·class="section-heading">211 <h3·id="improvements-and-new-features-2"·class="section-heading">
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1531 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1531 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
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1533 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1533 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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1536 </main>1536 </main>
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143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the143 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>144 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
145 ······</p>145 ······</p>
146 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>146 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
147 ····</footer>147 ····</footer>
148 ··</div>148 ··</div>
149 </main>149 </main>
150 </div>150 </div>
151 <script>151 <script>
152 ··function·mermaidLoaded()·{152 ··function·mermaidLoaded()·{
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774 ······</p>774 ······</p>
775 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>775 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
776 ····</footer>776 ····</footer>
777 ··</div>777 ··</div>
778 </main>778 </main>
779 </div>779 </div>
780 <script>780 <script>
781 ··function·mermaidLoaded()·{781 ··function·mermaidLoaded()·{
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156 The·<code·class="inline">tprof</code>·results·will·probably·be·incorrect·when·the·profiled·code·was156 The·<code·class="inline">tprof</code>·results·will·probably·be·incorrect·when·the·profiled·code·was
157 reloading·during·a·profiling·session.</p></section><h2·id="module-ad-hoc-profiling"·class="section-heading">157 reloading·during·a·profiling·session.</p></section><h2·id="module-ad-hoc-profiling"·class="section-heading">
158 ··<a·href="#module-ad-hoc-profiling"·class="hover-link">158 ··<a·href="#module-ad-hoc-profiling"·class="hover-link">
159 ····<i·class="ri-link-m"·aria-hidden="true"></i>159 ····<i·class="ri-link-m"·aria-hidden="true"></i>
160 ··</a>160 ··</a>
161 ··<span·class="text">Ad-hoc·profiling</span>161 ··<span·class="text">Ad-hoc·profiling</span>
162 </h2>162 </h2>
163 <p>Ad-hoc·profiling·is·convenient·for·profiling·a·single·function·call.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="7476354918-1">(</span><span·class="ss">lists</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">seq</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7476354918-2">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·458,·SHA:·bf2a1fb1faa744ecdda09920c29a32b8521eb4a5f2102e7b95c8f96a86a61738·...·]-1">)</span><span·class="p">.</span><span·class="w">163 <p>Ad-hoc·profiling·is·convenient·for·profiling·a·single·function·call.</p><p>For·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="0721402482-1">(</span><span·class="ss">lists</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">seq</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0721402482-2">[</span><span·class="mi">1</span><spa[·...·truncated·by·diffoscope;·len:·458,·SHA:·ff4515fc292dfe80f94142a17c23645355ad26081d5362d9413826a60f2950a9·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
164 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.92</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">164 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.92</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">
165 </span><span·class="n">FUNCTION</span><span·class="w">··········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="7476354918-4">[</span><span·class="w">·····</span><span·class="c1">%]</span><span·class="w">165 </span><span·class="n">FUNCTION</span><span·class="w">··········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="0721402482-4">[</span><span·class="w">·····</span><span·class="c1">%]</span><span·class="w">
166 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="7476354918-5">[</span><span·class="mf">100.00</span><span·class="p"·data-group-id="7476354918-5">]</span><span·class="w">166 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="0721402482-5">[</span><span·class="mf">100.00</span><span·class="p"·data-group-id="0721402482-5">]</span><span·class="w">
167 ····························</span><span·class="mi">32</span><span·class="w">············</span><span·class="p"·data-group-id="7476354918-6">[</span><span·class="w">·</span><span·class="mf">100.0</span><span·class="p"·data-group-id="7476354918-6">]</span><span·class="w">167 ····························</span><span·class="mi">32</span><span·class="w">············</span><span·class="p"·data-group-id="0721402482-6">[</span><span·class="w">·</span><span·class="mf">100.0</span><span·class="p"·data-group-id="0721402482-6">]</span><span·class="w">
168 </span><span·class="ss">ok</span></code></pre><p>By·default·tracing·is·enabled·for·all·functions·in·all·modules.·When·funs168 </span><span·class="ss">ok</span></code></pre><p>By·default·tracing·is·enabled·for·all·functions·in·all·modules.·When·funs
169 are·created·in·the·interactive·shell,·parts·of·shell·code·are·also·traced:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="8143534983-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="8143534983-2">(</span><span·class="p"·data-group-id="8143534983-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">lists</sp[·...·truncated·by·diffoscope;·len:·644,·SHA:·b2641554980dc609ff1612dd7a5f346d95fbd0f7e4dac338a1e70336bddfd9c5·...·]-1">)</span><span·class="p">.</span><span·class="w">169 are·created·in·the·interactive·shell,·parts·of·shell·code·are·also·traced:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="8055479892-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="8055479892-2">(</span><span·class="p"·data-group-id="8055479892-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">lists</sp[·...·truncated·by·diffoscope;·len:·644,·SHA:·f0c100160fb40119b789387432aca63bd5fac48cd734e6f2bf607b60f87fb212·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
170 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.95</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">170 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.95</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">
171 </span><span·class="n">FUNCTION</span><span·class="w">···················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-5">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">171 </span><span·class="n">FUNCTION</span><span·class="w">···················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-5">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
172 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">do_apply</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">············</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">······</span><span·class="mf">3.00</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-6">[</span><span·class="w">·</span><span·class="mf">3.61</span><span·class="p"·data-group-id="8143534983-6">]</span><span·class="w">172 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">do_apply</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">············</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">······</span><span·class="mf">3.00</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-6">[</span><span·class="w">·</span><span·class="mf">3.61</span><span·class="p"·data-group-id="8055479892-6">]</span><span·class="w">
173 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">match_list</span><span·class="p">/</span><span·class="mi">6</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">······</span><span·class="mf">3.00</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-7">[</span><span·class="w">·</span><span·class="mf">3.61</span><span·class="p"·data-group-id="8143534983-7">]</span><span·class="w">173 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">match_list</span><span·class="p">/</span><span·class="mi">6</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">······</span><span·class="mf">3.00</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-7">[</span><span·class="w">·</span><span·class="mf">3.61</span><span·class="p"·data-group-id="8055479892-7">]</span><span·class="w">
174 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">reverse</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">······</span><span·class="mf">4.00</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-8">[</span><span·class="w">·</span><span·class="mf">4.82</span><span·class="p"·data-group-id="8143534983-8">]</span><span·class="w">174 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">reverse</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">······</span><span·class="mf">4.00</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-8">[</span><span·class="w">·</span><span·class="mf">4.82</span><span·class="p"·data-group-id="8055479892-8">]</span><span·class="w">
175 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">expr_list</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">···········</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">······</span><span·class="mf">2.33</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-9">[</span><span·class="w">·</span><span·class="mf">8.43</span><span·class="p"·data-group-id="8143534983-9">]</span><span·class="w">175 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">expr_list</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">···········</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">······</span><span·class="mf">2.33</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-9">[</span><span·class="w">·</span><span·class="mf">8.43</span><span·class="p"·data-group-id="8055479892-9">]</span><span·class="w">
176 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">ret_expr</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">············</span><span·class="mi">4</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">······</span><span·class="mf">4.00</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-10">[</span><span·class="mf">19.28</span><span·class="p"·data-group-id="8143534983-10">]</span><span·class="w">176 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">ret_expr</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">············</span><span·class="mi">4</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">······</span><span·class="mf">4.00</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-10">[</span><span·class="mf">19.28</span><span·class="p"·data-group-id="8055479892-10">]</span><span·class="w">
177 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">merge_bindings</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·····</span><span·class="mi">18</span><span·class="w">······</span><span·class="mf">6.00</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-11">[</span><span·class="mf">21.69</span><span·class="p"·data-group-id="8143534983-11">]</span><span·class="w">177 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">merge_bindings</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·····</span><span·class="mi">18</span><span·class="w">······</span><span·class="mf">6.00</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-11">[</span><span·class="mf">21.69</span><span·class="p"·data-group-id="8055479892-11">]</span><span·class="w">
178 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">···············</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="8143534983-12">[</span><span·class="mf">38.55</span><span·class="p"·data-group-id="8143534983-12">]</span><span·class="w">178 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">···············</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="8055479892-12">[</span><span·class="mf">38.55</span><span·class="p"·data-group-id="8055479892-12">]</span><span·class="w">
179 ·····································</span><span·class="mi">83</span><span·class="w">············</span><span·class="p"·data-group-id="8143534983-13">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="8143534983-13">]</span><span·class="w">179 ·····································</span><span·class="mi">83</span><span·class="w">············</span><span·class="p"·data-group-id="8055479892-13">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="8055479892-13">]</span><span·class="w">
180 </span><span·class="ss">ok</span></code></pre><p>However,·it·is·possible·to·limit·the·trace·to·specific·functions·or·modules:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="6022272905-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="6022272905-2">(</span><span·class="p"·data-group-id="6022272905-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">lists</sp[·...·truncated·by·diffoscope;·len:·247,·SHA:·29517725c3d82378615da51086c9ad56bc4ff9782561573e8bdb9aa2bcd20be4·...·]-3">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">180 </span><span·class="ss">ok</span></code></pre><p>However,·it·is·possible·to·limit·the·trace·to·specific·functions·or·modules:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="6150305894-1">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="6150305894-2">(</span><span·class="p"·data-group-id="6150305894-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">lists</sp[·...·truncated·by·diffoscope;·len:·247,·SHA:·dc8b6d813985d3ad403e9e0ba68cc2be15bca268c6297a149884d2ffffdbfe30·...·]-3">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
181 ·················</span><span·class="p"·data-group-id="6022272905-4">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pattern</span><span·class="w">[·...·truncated·by·diffoscope;·len:·558,·SHA:·c8ce668ae212bb1a12fac1bb7b9e73bb51229ac625259e6d0d90cb9b04be2ba2·...·]-1">)</span><span·class="p">.</span><span·class="w">181 ·················</span><span·class="p"·data-group-id="6150305894-4">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">pattern</span><span·class="w">[·...·truncated·by·diffoscope;·len:·558,·SHA:·722103a457cdb3710faa0e2e28c01c16522b56f3d326a417fa30d58a05a5f884·...·]-1">)</span><span·class="p">.</span><span·class="w">
182 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.98</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">182 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.98</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">··</span><span·class="o">--</span><span·class="w">··</span><span·class="mf">100.00</span><span·class="c1">%·of·total·***·</span><span·class="w">
183 </span><span·class="n">FUNCTION</span><span·class="w">··········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="6022272905-7">[</span><span·class="w">·····</span><span·class="c1">%]</span><span·class="w">183 </span><span·class="n">FUNCTION</span><span·class="w">··········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="6150305894-7">[</span><span·class="w">·····</span><span·class="c1">%]</span><span·class="w">
184 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="6022272905-8">[</span><span·class="mf">100.00</span><span·class="p"·data-group-id="6022272905-8">]</span><span·class="w">184 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·····</span><span·class="mi">32</span><span·class="w">······</span><span·class="mf">6.40</span><span·class="w">··</span><span·class="p"·data-group-id="6150305894-8">[</span><span·class="mf">100.00</span><span·class="p"·data-group-id="6150305894-8">]</span><span·class="w">
185 ····························</span><span·class="mi">32</span><span·class="w">············</span><span·class="p"·data-group-id="6022272905-9">[</span><span·class="w">·</span><span·class="mf">100.0</span><span·class="p"·data-group-id="6022272905-9">]</span><span·class="w">185 ····························</span><span·class="mi">32</span><span·class="w">············</span><span·class="p"·data-group-id="6150305894-9">[</span><span·class="w">·</span><span·class="mf">100.0</span><span·class="p"·data-group-id="6150305894-9">]</span><span·class="w">
  
186 </span><span·class="ss">ok</span></code></pre><p>Ad-hoc·profiling·results·can·be·printed·in·a·few·different·ways.·The·following186 </span><span·class="ss">ok</span></code></pre><p>Ad-hoc·profiling·results·can·be·printed·in·a·few·different·ways.·The·following
187 examples·use·the·<code·class="inline">test</code>·module·defined·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="5390323004-1">(</span><span·class="ss">test</span><span·class="p"·data-group-id="5390323004-1">)</span><span·class="p">.</span><span·class="w">187 examples·use·the·<code·class="inline">test</code>·module·defined·like·this:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4682929175-1">(</span><span·class="ss">test</span><span·class="p"·data-group-id="4682929175-1">)</span><span·class="p">.</span><span·class="w">
188 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="5390323004-2">(</span><span·class="p"·data-group-id="5390323004-3">[</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="5390323004-3">]</span><span·class="p"·data-group-id="5390323004-2">)</span><span·class="p">.</span><span·class="w">188 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4682929175-2">(</span><span·class="p"·data-group-id="4682929175-3">[</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="p"·data-group-id="4682929175-3">]</span><span·class="p"·data-group-id="4682929175-2">)</span><span·class="p">.</span><span·class="w">
189 </span><span·class="nf">test_spawn</span><span·class="p"·data-group-id="5390323004-4">(</span><span·class="p"·data-group-id="5390323004-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">189 </span><span·class="nf">test_spawn</span><span·class="p"·data-group-id="4682929175-4">(</span><span·class="p"·data-group-id="4682929175-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
190 ····</span><span·class="p"·data-group-id="5390323004-5">{</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p"·data-group-id="5390323004-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·691,·SHA:·8c629bf6bc1c160baba391d2eedbbf3d02ee9a13a482231722973d709f19a805·...·]-6">)</span><span·class="p">,</span><span·class="w">190 ····</span><span·class="p"·data-group-id="4682929175-5">{</span><span·class="n">Pid</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p"·data-group-id="4682929175-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·cl[·...·truncated·by·diffoscope;·len:·691,·SHA:·b7483e90283ff7258bac38bb36467dd86a3d72f7607a2752ab177e1dca8adc08·...·]-6">)</span><span·class="p">,</span><span·class="w">
191 ····</span><span·class="k">receive</span><span·class="w">191 ····</span><span·class="k">receive</span><span·class="w">
192 ········</span><span·class="p"·data-group-id="5390323004-9">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·151,·SHA:·494f9e42955773dcabd9f9242cad884bbd47aa735029434f6af458894188cd7e·...·]-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">192 ········</span><span·class="p"·data-group-id="4682929175-9">{</span><span·class="ss">&#39;DOWN&#39;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MRef</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">process</span><span·class="p">,</span><span·class="w">·<[·...·truncated·by·diffoscope;·len:·151,·SHA:·2e87211cd7fcf33c7a643d013233f4ca14c24cf396327d85cf1d3468b4f84e6c·...·]-9">}</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
193 ············</span><span·class="ss">done</span><span·class="w">193 ············</span><span·class="ss">done</span><span·class="w">
194 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>By·default·per-process·statistics·is·shown:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="3168122841-1">(</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">test_spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3168122841-2">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·365,·SHA:·6c978a9cc5b58fd16c96a68ab53f341b8f679d15fee367365e5cd0f4869639f9·...·]-1">)</span><span·class="p">.</span><span·class="w">194 ····</span><span·class="k">end</span><span·class="p">.</span></code></pre><p>By·default·per-process·statistics·is·shown:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="2759011215-1">(</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">test_spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="2759011215-2">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·365,·SHA:·bfbf563a3d0714c0a827b4504fd0288293e402e837348c0626c4d6659be78df0·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
195 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.176</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">23.66</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">195 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.176</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">23.66</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
196 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-4">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">196 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-4">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
197 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-5">[</span><span·class="w">·</span><span·class="mf">9.09</span><span·class="p"·data-group-id="3168122841-5">]</span><span·class="w">197 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-5">[</span><span·class="w">·</span><span·class="mf">9.09</span><span·class="p"·data-group-id="2759011215-5">]</span><span·class="w">
198 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-6">[</span><span·class="mf">27.27</span><span·class="p"·data-group-id="3168122841-6">]</span><span·class="w">198 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-6">[</span><span·class="mf">27.27</span><span·class="p"·data-group-id="2759011215-6">]</span><span·class="w">
199 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-7">[</span><span·class="mf">63.64</span><span·class="p"·data-group-id="3168122841-7">]</span><span·class="w">199 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-7">[</span><span·class="mf">63.64</span><span·class="p"·data-group-id="2759011215-7">]</span><span·class="w">
200 ··································</span><span·class="mi">22</span><span·class="w">············</span><span·class="p"·data-group-id="3168122841-8">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="3168122841-8">]</span><span·class="w">200 ··································</span><span·class="mi">22</span><span·class="w">············</span><span·class="p"·data-group-id="2759011215-8">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="2759011215-8">]</span><span·class="w">
  
201 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.177</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">76.34</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">201 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.177</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">76.34</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
202 </span><span·class="n">FUNCTION</span><span·class="w">···········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-9">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">202 </span><span·class="n">FUNCTION</span><span·class="w">···········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-9">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
203 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">apply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-10">[</span><span·class="w">·</span><span·class="mf">9.86</span><span·class="p"·data-group-id="3168122841-10">]</span><span·class="w">203 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">apply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-10">[</span><span·class="w">·</span><span·class="mf">9.86</span><span·class="p"·data-group-id="2759011215-10">]</span><span·class="w">
204 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">·······</span><span·class="mi">9</span><span·class="w">·····</span><span·class="mi">64</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="3168122841-11">[</span><span·class="mf">90.14</span><span·class="p"·data-group-id="3168122841-11">]</span><span·class="w">204 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">·······</span><span·class="mi">9</span><span·class="w">·····</span><span·class="mi">64</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="2759011215-11">[</span><span·class="mf">90.14</span><span·class="p"·data-group-id="2759011215-11">]</span><span·class="w">
205 ·····························</span><span·class="mi">71</span><span·class="w">············</span><span·class="p"·data-group-id="3168122841-12">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="3168122841-12">]</span></code></pre><p>The·following·example·prints·the·combined·memory·allocation·of·all205 ·····························</span><span·class="mi">71</span><span·class="w">············</span><span·class="p"·data-group-id="2759011215-12">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="2759011215-12">]</span></code></pre><p>The·following·example·prints·the·combined·memory·allocation·of·all
206 processes,·sorted·by·the·total·number·of·allocated·words·in·descending206 processes,·sorted·by·the·total·number·of·allocated·words·in·descending
207 order:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="7661485340-1">(</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">test_spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7661485340-2">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·ea5a42bcecc48e450320a79082396fdb5784e5bacc2a2040fe3df270c7066a18·...·]-2">]</span><span·class="p">,</span><span·class="w">207 order:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="6327586913-1">(</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">test_spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6327586913-2">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·18,·SHA:·42de63adec68a4562e28506161c274d29d33fde25b3d380be5d277336f76f85c·...·]-2">]</span><span·class="p">,</span><span·class="w">
208 ·················</span><span·class="p"·data-group-id="7661485340-3">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">report</span><span·class="w">[·...·truncated·by·diffoscope;·len:·560,·SHA:·03c604705ab347e75b0a9b1aa4dd5d6dab408d77e3da3d945d13ede5b77ae9a4·...·]-1">)</span><span·class="p">.</span><span·class="w">208 ·················</span><span·class="p"·data-group-id="6327586913-3">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">report</span><span·class="w">[·...·truncated·by·diffoscope;·len:·560,·SHA:·673c8f9acc801b96ab76c2222727cec14cadefc6e5228c6d4313bd091271128d·...·]-1">)</span><span·class="p">.</span><span·class="w">
  
209 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="7661485340-6">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">209 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="6327586913-6">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
210 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">············</span><span·class="mi">9</span><span·class="w">·····</span><span·class="mi">64</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="7661485340-7">[</span><span·class="mf">68.82</span><span·class="p"·data-group-id="7661485340-7">]</span><span·class="w">210 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">············</span><span·class="mi">9</span><span·class="w">·····</span><span·class="mi">64</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="6327586913-7">[</span><span·class="mf">68.82</span><span·class="p"·data-group-id="6327586913-7">]</span><span·class="w">
211 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="7661485340-8">[</span><span·class="mf">15.05</span><span·class="p"·data-group-id="7661485340-8">]</span><span·class="w">211 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="6327586913-8">[</span><span·class="mf">15.05</span><span·class="p"·data-group-id="6327586913-8">]</span><span·class="w">
212 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">apply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">··············</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="7661485340-9">[</span><span·class="w">·</span><span·class="mf">7.53</span><span·class="p"·data-group-id="7661485340-9">]</span><span·class="w">212 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">apply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">··············</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="6327586913-9">[</span><span·class="w">·</span><span·class="mf">7.53</span><span·class="p"·data-group-id="6327586913-9">]</span><span·class="w">
213 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="7661485340-10">[</span><span·class="w">·</span><span·class="mf">6.45</span><span·class="p"·data-group-id="7661485340-10">]</span><span·class="w">213 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="6327586913-10">[</span><span·class="w">·</span><span·class="mf">6.45</span><span·class="p"·data-group-id="6327586913-10">]</span><span·class="w">
214 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="7661485340-11">[</span><span·class="w">·</span><span·class="mf">2.15</span><span·class="p"·data-group-id="7661485340-11">]</span><span·class="w">214 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="6327586913-11">[</span><span·class="w">·</span><span·class="mf">2.15</span><span·class="p"·data-group-id="6327586913-11">]</span><span·class="w">
215 ··································</span><span·class="mi">93</span><span·class="w">············</span><span·class="p"·data-group-id="7661485340-12">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="7661485340-12">]</span></code></pre><p>The·profiling·data·can·also·be·collected·for·further·inspection:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·un[·...·truncated·by·diffoscope;·len:·437,·SHA:·71c324cb5f1c996a23daa35800183e0c802c821c5ade0047b8e72572c6480d62·...·]9-2">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">215 ··································</span><span·class="mi">93</span><span·class="w">············</span><span·class="p"·data-group-id="6327586913-12">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="6327586913-12">]</span></code></pre><p>The·profiling·data·can·also·be·collected·for·further·inspection:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·un[·...·truncated·by·diffoscope;·len:·437,·SHA:·5c895d0cb956050430333b7aac02bfaf0b01c08635853ab2e79f769ddbd440f9·...·]9-2">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">
216 ·······································</span><span·class="p"·data-group-id="3541894499-3">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">report</span><span·class="w">[·...·truncated·by·diffoscope;·len:·183,·SHA:·d5ec32613fd34a61083a0e8984ef74d2e00a67f12d3f10317a488f2cec1838b9·...·]9-2">)</span><span·class="p">.</span><span·class="w">216 ·······································</span><span·class="p"·data-group-id="0172319709-3">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">report</span><span·class="w">[·...·truncated·by·diffoscope;·len:·183,·SHA:·c780e2eba2b1a0ca226d215c96edaf7e36581975f7038a0940fe2347b097597b·...·]9-2">)</span><span·class="p">.</span><span·class="w">
217 </span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="o">&gt;</span><span·class="gp·unselectable">217 </span><span·class="o">&lt;</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="o">&gt;</span><span·class="gp·unselectable">
218 4&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3541894499-4">(</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">inspect</span><span·class="p"·data-group-id="3541894499-5">(</span><span·class="n">ProfileData</span><span·class="p">,</span><span·class="w">·</span><span·class="ss[·...·truncated·by·diffoscope;·len:·376,·SHA:·211a7699347a177a38ea5c164daec61100242c67285e1a09c3fc9dba2a56ccce·...·]9-4">)</span><span·class="p">.</span><span·class="w">218 4&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0172319709-4">(</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">inspect</span><span·class="p"·data-group-id="0172319709-5">(</span><span·class="n">ProfileData</span><span·class="p">,</span><span·class="w">·</span><span·class="ss[·...·truncated·by·diffoscope;·len:·376,·SHA:·f5891ee852020710462108f28ab35eda2a7427d3f531f761373b7db61a1d21e8·...·]9-4">)</span><span·class="p">.</span><span·class="w">
  
219 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.223</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">23.66</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">219 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.223</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">23.66</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
220 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-7">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">220 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-7">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
221 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-8">[</span><span·class="mf">63.64</span><span·class="p"·data-group-id="3541894499-8">]</span><span·class="w">221 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-8">[</span><span·class="mf">63.64</span><span·class="p"·data-group-id="0172319709-8">]</span><span·class="w">
222 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-9">[</span><span·class="mf">27.27</span><span·class="p"·data-group-id="3541894499-9">]</span><span·class="w">222 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-9">[</span><span·class="mf">27.27</span><span·class="p"·data-group-id="0172319709-9">]</span><span·class="w">
223 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-10">[</span><span·class="w">·</span><span·class="mf">9.09</span><span·class="p"·data-group-id="3541894499-10">]</span><span·class="w">223 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-10">[</span><span·class="w">·</span><span·class="mf">9.09</span><span·class="p"·data-group-id="0172319709-10">]</span><span·class="w">
224 ··································</span><span·class="mi">22</span><span·class="w">············</span><span·class="p"·data-group-id="3541894499-11">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="3541894499-11">]</span><span·class="w">224 ··································</span><span·class="mi">22</span><span·class="w">············</span><span·class="p"·data-group-id="0172319709-11">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="0172319709-11">]</span><span·class="w">
  
225 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.224</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">76.34</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">225 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.224</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">76.34</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
226 </span><span·class="n">FUNCTION</span><span·class="w">···········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-12">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">226 </span><span·class="n">FUNCTION</span><span·class="w">···········</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-12">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
227 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">·······</span><span·class="mi">9</span><span·class="w">·····</span><span·class="mi">64</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-13">[</span><span·class="mf">90.14</span><span·class="p"·data-group-id="3541894499-13">]</span><span·class="w">227 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">seq_loop</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">·······</span><span·class="mi">9</span><span·class="w">·····</span><span·class="mi">64</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-13">[</span><span·class="mf">90.14</span><span·class="p"·data-group-id="0172319709-13">]</span><span·class="w">
228 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">apply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="3541894499-14">[</span><span·class="w">·</span><span·class="mf">9.86</span><span·class="p"·data-group-id="3541894499-14">]</span><span·class="w">228 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">apply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">7</span><span·class="w">·········</span><span·class="mi">7</span><span·class="w">··</span><span·class="p"·data-group-id="0172319709-14">[</span><span·class="w">·</span><span·class="mf">9.86</span><span·class="p"·data-group-id="0172319709-14">]</span><span·class="w">
229 ·····························</span><span·class="mi">71</span><span·class="w">············</span><span·class="p"·data-group-id="3541894499-15">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="3541894499-15">]</span></code></pre><p>Which·processes·that·are·profiled·depends·on·the·profiling·type.</p><ul><li><p><code·class="inline">call_count</code>·(default)·counts·calls·in·all·processes.</p></li><li><p><code·class="inline">call_time</code>·and·<code·class="inline">call_memory</code>·limits·the·profiling·to·the·processes229 ·····························</span><span·class="mi">71</span><span·class="w">············</span><span·class="p"·data-group-id="0172319709-15">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="0172319709-15">]</span></code></pre><p>Which·processes·that·are·profiled·depends·on·the·profiling·type.</p><ul><li><p><code·class="inline">call_count</code>·(default)·counts·calls·in·all·processes.</p></li><li><p><code·class="inline">call_time</code>·and·<code·class="inline">call_memory</code>·limits·the·profiling·to·the·processes
230 spawned·from·the·user-provided·function·(using·the·<code·class="inline">set_on_spawn</code>230 spawned·from·the·user-provided·function·(using·the·<code·class="inline">set_on_spawn</code>
231 option·for·<a·href="../../../../lib/kernel-10.2.6/doc/html/trace.html#process/4"><code·class="inline">trace:process/4</code></a>).</p></li></ul><p><code·class="inline">call_time</code>·and·<code·class="inline">call_memory</code>·can·be·restricted·to·profile·a·single·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="6148573365-1">(</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">test_spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6148573365-2">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·17,·SHA:·7dee587abcc2d386b902d48e85c71689a30afc3a71f8d1a070fe127356e2e629·...·]5-2">]</span><span·class="p">,</span><span·class="w">231 option·for·<a·href="../../../../lib/kernel-10.2.6/doc/html/trace.html#process/4"><code·class="inline">trace:process/4</code></a>).</p></li></ul><p><code·class="inline">call_time</code>·and·<code·class="inline">call_memory</code>·can·be·restricted·to·profile·a·single·process:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="4599571235-1">(</span><span·class="ss">test</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">test_spawn</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="4599571235-2">[</span><span·class="p"·data-gr[·...·truncated·by·diffoscope;·len:·17,·SHA:·cfec169f5f6260334e266c4f3879a1d7f1d6be9a1631c9cbccd5462695ceb011·...·]5-2">]</span><span·class="p">,</span><span·class="w">
232 ·················</span><span·class="p"·data-group-id="6148573365-3">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">set_on_spawn</span><span·clas[·...·truncated·by·diffoscope;·len:·188,·SHA:·3c8cb403bd378327c73614e576bcc40c6fe613a20f492f245d0a9bea412b5fee·...·]5-1">)</span><span·class="p">.</span><span·class="w">232 ·················</span><span·class="p"·data-group-id="4599571235-3">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">set_on_spawn</span><span·clas[·...·truncated·by·diffoscope;·len:·188,·SHA:·c747f3552a837a8c67e79282adffdb65ce1778bde2f32a297b6de7a20c4d305f·...·]5-1">)</span><span·class="p">.</span><span·class="w">
  
233 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.183</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">100.00</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">233 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.183</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">100.00</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
234 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="6148573365-4">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">234 </span><span·class="n">FUNCTION</span><span·class="w">················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="4599571235-4">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
235 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="6148573365-5">[</span><span·class="w">·</span><span·class="mf">9.09</span><span·class="p"·data-group-id="6148573365-5">]</span><span·class="w">235 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_monitor</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="4599571235-5">[</span><span·class="w">·</span><span·class="mf">9.09</span><span·class="p"·data-group-id="4599571235-5">]</span><span·class="w">
236 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="6148573365-6">[</span><span·class="mf">27.27</span><span·class="p"·data-group-id="6148573365-6">]</span><span·class="w">236 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">spawn_opt</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="4599571235-6">[</span><span·class="mf">27.27</span><span·class="p"·data-group-id="4599571235-6">]</span><span·class="w">
237 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="6148573365-7">[</span><span·class="mf">63.64</span><span·class="p"·data-group-id="6148573365-7">]</span></code></pre><p><a·href=""·id="pg_example"></a></p><p>Erlang·programs·can·perform·expensive·operations·in·other·processes237 </span><span·class="nc">test</span><span·class="p">:</span><span·class="ss">test_spawn</span><span·class="p">/</span><span·class="mi">0</span><span·class="w">···········</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">14</span><span·class="w">········</span><span·class="mi">14</span><span·class="w">··</span><span·class="p"·data-group-id="4599571235-7">[</span><span·class="mf">63.64</span><span·class="p"·data-group-id="4599571235-7">]</span></code></pre><p><a·href=""·id="pg_example"></a></p><p>Erlang·programs·can·perform·expensive·operations·in·other·processes
238 than·the·original·one.·You·can·include·multiple,·new,·or·even·all238 than·the·original·one.·You·can·include·multiple,·new,·or·even·all
239 processes·in·the·trace·when·measuring·time·or·memory:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="nc">pg</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="3573110096-1">(</span><span·class="p"·data-group-id="3573110096-1">)</span><span·class="p">.</span><span·class="w">239 processes·in·the·trace·when·measuring·time·or·memory:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">7&gt;·</span><span·class="nc">pg</span><span·class="p">:</span><span·class="nf">start_link</span><span·class="p"·data-group-id="1829531021-1">(</span><span·class="p"·data-group-id="1829531021-1">)</span><span·class="p">.</span><span·class="w">
240 </span><span·class="p"·data-group-id="3573110096-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.252</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3573110096-2">}</span><span·class="gp·unselectable">240 </span><span·class="p"·data-group-id="1829531021-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.252</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="1829531021-2">}</span><span·class="gp·unselectable">
241 8&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="3573110096-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="3573110096-4">(</span><span·class="p"·data-group-id="3573110096-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">pg</span><span·class="p">:</span><span·class="nf">join</span><span·class="p"·data-group-id="3573110096-5">(</span><span·class="ss">group</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">self</span><span·class="p"·data-group-id="3573110096-6">(</span><span·class="p"·data-group-id="3573110096-6">)</span><span·class="p"·data-group-id="3573110096-5">)</span><span·class="w">·</span><span·class="k">end</span><span·class="p">,</span><span·class="w"> 
242 ·················</span><span·class="p"·data-group-id="3573110096-7">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·371,·SHA:·078f57b1ed3c1d42e0f52570d1a16a963961977f6d134a3b86f5989064980b53·...·]</span><span·class="w">241 8&gt;·</span><span·class="nc">tprof</span><span·class="p">:</span><span·class="nf">profile</span><span·class="p"·data-group-id="1829531021-3">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="1829531021-4">(</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·565,·SHA:·73724dea8b99161568c249a4e5de7275db5c904754ab0c5bfaeecab0a09c374c·...·]</span><span·class="w">
 242 ·················</span><span·class="p"·data-group-id="1829531021-7">#{</span><span·class="ss">type</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="ss">call_memory</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">rootset</span><span·class="w">·</span><span·class="p">=&gt;</span><span·class="w">·</span><span·class="p"·data-group-id="1829531021-8">[</span><span·class="ss">pg</span><span·class="p"·data-group-id="1829531021-8">]</span><span·class="p"·data-group-id="1829531021-7">}</span><span·class="p"·data-group-id="1829531021-3">)</span><span·class="p">.</span><span·class="w">
243 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.252</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">52.86</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">243 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.252</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">52.86</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
244 </span><span·class="n">FUNCTION</span><span·class="w">······················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-9">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">244 </span><span·class="n">FUNCTION</span><span·class="w">······················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-9">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
245 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">leave_local_update_ets</span><span·class="p">/</span><span·class="mi">5</span><span·class="w">·······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-10">[</span><span·class="w">·</span><span·class="mf">1.80</span><span·class="p"·data-group-id="3573110096-10">]</span><span·class="w">245 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">leave_local_update_ets</span><span·class="p">/</span><span·class="mi">5</span><span·class="w">·······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">2</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-10">[</span><span·class="w">·</span><span·class="mf">1.80</span><span·class="p"·data-group-id="1829531021-10">]</span><span·class="w">
246 </span><span·class="nc">gen</span><span·class="p">:</span><span·class="ss">reply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·······················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-11">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="3573110096-11">]</span><span·class="w">246 </span><span·class="nc">gen</span><span·class="p">:</span><span·class="ss">reply</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·······················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-11">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="1829531021-11">]</span><span·class="w">
247 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">monitor</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-12">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="3573110096-12">]</span><span·class="w">247 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">monitor</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-12">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="1829531021-12">]</span><span·class="w">
248 </span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="ss">try_handle_call</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-13">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="3573110096-13">]</span><span·class="w">248 </span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="ss">try_handle_call</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">······</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-13">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="1829531021-13">]</span><span·class="w">
249 </span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="ss">try_dispatch</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-14">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="3573110096-14">]</span><span·class="w">249 </span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="ss">try_dispatch</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-14">[</span><span·class="w">·</span><span·class="mf">2.70</span><span·class="p"·data-group-id="1829531021-14">]</span><span·class="w">
250 </span><span·class="nc">maps</span><span·class="p">:</span><span·class="ss">iterator</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">···················</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-15">[</span><span·class="w">·</span><span·class="mf">3.60</span><span·class="p"·data-group-id="3573110096-15">]</span><span·class="w">250 </span><span·class="nc">maps</span><span·class="p">:</span><span·class="ss">iterator</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">···················</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-15">[</span><span·class="w">·</span><span·class="mf">3.60</span><span·class="p"·data-group-id="1829531021-15">]</span><span·class="w">
251 </span><span·class="nc">maps</span><span·class="p">:</span><span·class="ss">take</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·······················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-16">[</span><span·class="w">·</span><span·class="mf">5.41</span><span·class="p"·data-group-id="3573110096-16">]</span><span·class="w">251 </span><span·class="nc">maps</span><span·class="p">:</span><span·class="ss">take</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">·······················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">6</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-16">[</span><span·class="w">·</span><span·class="mf">5.41</span><span·class="p"·data-group-id="1829531021-16">]</span><span·class="w">
252 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">join_local_update_ets</span><span·class="p">/</span><span·class="mi">5</span><span·class="w">········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">8</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-17">[</span><span·class="w">·</span><span·class="mf">7.21</span><span·class="p"·data-group-id="3573110096-17">]</span><span·class="w">252 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">join_local_update_ets</span><span·class="p">/</span><span·class="mi">5</span><span·class="w">········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">8</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-17">[</span><span·class="w">·</span><span·class="mf">7.21</span><span·class="p"·data-group-id="1829531021-17">]</span><span·class="w">
253 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">handle_info</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">8</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-18">[</span><span·class="w">·</span><span·class="mf">7.21</span><span·class="p"·data-group-id="3573110096-18">]</span><span·class="w">253 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">handle_info</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">8</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-18">[</span><span·class="w">·</span><span·class="mf">7.21</span><span·class="p"·data-group-id="1829531021-18">]</span><span·class="w">
254 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">handle_call</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">9</span><span·class="w">·········</span><span·class="mi">9</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-19">[</span><span·class="w">·</span><span·class="mf">8.11</span><span·class="p"·data-group-id="3573110096-19">]</span><span·class="w">254 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">handle_call</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">9</span><span·class="w">·········</span><span·class="mi">9</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-19">[</span><span·class="w">·</span><span·class="mf">8.11</span><span·class="p"·data-group-id="1829531021-19">]</span><span·class="w">
255 </span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="ss">loop</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">·················</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">9</span><span·class="w">·········</span><span·class="mi">4</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-20">[</span><span·class="w">·</span><span·class="mf">8.11</span><span·class="p"·data-group-id="3573110096-20">]</span><span·class="w">255 </span><span·class="nc">gen_server</span><span·class="p">:</span><span·class="ss">loop</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">·················</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">9</span><span·class="w">·········</span><span·class="mi">4</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-20">[</span><span·class="w">·</span><span·class="mf">8.11</span><span·class="p"·data-group-id="1829531021-20">]</span><span·class="w">
256 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="ss">lookup</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">······················</span><span·class="mi">2</span><span·class="w">·····</span><span·class="mi">10</span><span·class="w">·········</span><span·class="mi">5</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-21">[</span><span·class="w">·</span><span·class="mf">9.01</span><span·class="p"·data-group-id="3573110096-21">]</span><span·class="w">256 </span><span·class="nc">ets</span><span·class="p">:</span><span·class="ss">lookup</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">······················</span><span·class="mi">2</span><span·class="w">·····</span><span·class="mi">10</span><span·class="w">·········</span><span·class="mi">5</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-21">[</span><span·class="w">·</span><span·class="mf">9.01</span><span·class="p"·data-group-id="1829531021-21">]</span><span·class="w">
257 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">join_local</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">···················</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">11</span><span·class="w">········</span><span·class="mi">11</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-22">[</span><span·class="w">·</span><span·class="mf">9.91</span><span·class="p"·data-group-id="3573110096-22">]</span><span·class="w">257 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">join_local</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">···················</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">11</span><span·class="w">········</span><span·class="mi">11</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-22">[</span><span·class="w">·</span><span·class="mf">9.91</span><span·class="p"·data-group-id="1829531021-22">]</span><span·class="w">
258 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">notify_group</span><span·class="p">/</span><span·class="mi">5</span><span·class="w">·················</span><span·class="mi">2</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-23">[</span><span·class="mf">14.41</span><span·class="p"·data-group-id="3573110096-23">]</span><span·class="w">258 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">notify_group</span><span·class="p">/</span><span·class="mi">5</span><span·class="w">·················</span><span·class="mi">2</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-23">[</span><span·class="mf">14.41</span><span·class="p"·data-group-id="1829531021-23">]</span><span·class="w">
259 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">setelement</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">···············</span><span·class="mi">2</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-24">[</span><span·class="mf">14.41</span><span·class="p"·data-group-id="3573110096-24">]</span><span·class="w">259 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">setelement</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">···············</span><span·class="mi">2</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-24">[</span><span·class="mf">14.41</span><span·class="p"·data-group-id="1829531021-24">]</span><span·class="w">
260 ·······································</span><span·class="mi">111</span><span·class="w">············</span><span·class="p"·data-group-id="3573110096-25">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="3573110096-25">]</span><span·class="w">260 ·······································</span><span·class="mi">111</span><span·class="w">············</span><span·class="p"·data-group-id="1829531021-25">[</span><span·class="mf">100.0</span><span·class="p"·data-group-id="1829531021-25">]</span><span·class="w">
  
261 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.255</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">47.14</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">261 </span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="o">*</span><span·class="w">·</span><span·class="n">Process</span><span·class="w">·</span><span·class="o">&lt;</span><span·class="mf">0.255</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="w">····</span><span·class="o">--</span><span·class="w">·</span><span·class="mf">47.14</span><span·class="w">·</span><span·class="c1">%·of·total·allocations·***</span><span·class="w">
262 </span><span·class="n">FUNCTION</span><span·class="w">···················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-26">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">262 </span><span·class="n">FUNCTION</span><span·class="w">···················</span><span·class="n">CALLS</span><span·class="w">··</span><span·class="n">WORDS</span><span·class="w">··</span><span·class="n">PER</span><span·class="w">·</span><span·class="n">CALL</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-26">[</span><span·class="w">····</span><span·class="c1">%]</span><span·class="w">
263 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">match_list</span><span·class="p">/</span><span·class="mi">6</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-27">[</span><span·class="w">·</span><span·class="mf">3.03</span><span·class="p"·data-group-id="3573110096-27">]</span><span·class="w">263 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">match_list</span><span·class="p">/</span><span·class="mi">6</span><span·class="w">··········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-27">[</span><span·class="w">·</span><span·class="mf">3.03</span><span·class="p"·data-group-id="1829531021-27">]</span><span·class="w">
264 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">monitor</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">···············</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-28">[</span><span·class="w">·</span><span·class="mf">3.03</span><span·class="p"·data-group-id="3573110096-28">]</span><span·class="w">264 </span><span·class="nc">erlang</span><span·class="p">:</span><span·class="nb">monitor</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">···············</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">3</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-28">[</span><span·class="w">·</span><span·class="mf">3.03</span><span·class="p"·data-group-id="1829531021-28">]</span><span·class="w">
265 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">reverse</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">················</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-29">[</span><span·class="w">·</span><span·class="mf">4.04</span><span·class="p"·data-group-id="3573110096-29">]</span><span·class="w">265 </span><span·class="nc">lists</span><span·class="p">:</span><span·class="ss">reverse</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">················</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-29">[</span><span·class="w">·</span><span·class="mf">4.04</span><span·class="p"·data-group-id="1829531021-29">]</span><span·class="w">
266 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">join</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">4</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-30">[</span><span·class="w">·</span><span·class="mf">4.04</span><span·class="p"·data-group-id="3573110096-30">]</span><span·class="w">266 </span><span·class="nc">pg</span><span·class="p">:</span><span·class="ss">join</span><span·class="p">/</span><span·class="mi">3</span><span·class="w">······················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">4</span><span·class="w">·········</span><span·class="mi">4</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-30">[</span><span·class="w">·</span><span·class="mf">4.04</span><span·class="p"·data-group-id="1829531021-30">]</span><span·class="w">
267 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">add_bindings</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·········</span><span·class="mi">5</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-31">[</span><span·class="w">·</span><span·class="mf">5.05</span><span·class="p"·data-group-id="3573110096-31">]</span><span·class="w">267 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">add_bindings</span><span·class="p">/</span><span·class="mi">2</span><span·class="w">········</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">5</span><span·class="w">·········</span><span·class="mi">5</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-31">[</span><span·class="w">·</span><span·class="mf">5.05</span><span·class="p"·data-group-id="1829531021-31">]</span><span·class="w">
268 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">do_apply</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">············</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-32">[</span><span·class="w">·</span><span·class="mf">6.06</span><span·class="p"·data-group-id="3573110096-32">]</span><span·class="w">268 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">do_apply</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">············</span><span·class="mi">2</span><span·class="w">······</span><span·class="mi">6</span><span·class="w">·········</span><span·class="mi">3</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-32">[</span><span·class="w">·</span><span·class="mf">6.06</span><span·class="p"·data-group-id="1829531021-32">]</span><span·class="w">
269 </span><span·class="nc">gen</span><span·class="p">:</span><span·class="ss">call</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">·····················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">8</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-33">[</span><span·class="w">·</span><span·class="mf">8.08</span><span·class="p"·data-group-id="3573110096-33">]</span><span·class="w">269 </span><span·class="nc">gen</span><span·class="p">:</span><span·class="ss">call</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">·····················</span><span·class="mi">1</span><span·class="w">······</span><span·class="mi">8</span><span·class="w">·········</span><span·class="mi">8</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-33">[</span><span·class="w">·</span><span·class="mf">8.08</span><span·class="p"·data-group-id="1829531021-33">]</span><span·class="w">
270 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">expr_list</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">···········</span><span·class="mi">4</span><span·class="w">·····</span><span·class="mi">10</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-34">[</span><span·class="mf">10.10</span><span·class="p"·data-group-id="3573110096-34">]</span><span·class="w">270 </span><span·class="nc">erl_eval</span><span·class="p">:</span><span·class="ss">expr_list</span><span·class="p">/</span><span·class="mi">7</span><span·class="w">···········</span><span·class="mi">4</span><span·class="w">·····</span><span·class="mi">10</span><span·class="w">·········</span><span·class="mi">2</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-34">[</span><span·class="mf">10.10</span><span·class="p"·data-group-id="1829531021-34">]</span><span·class="w">
271 </span><span·class="nc">gen</span><span·class="p">:</span><span·class="ss">do_call</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">········</span><span·class="mi">16</span><span·class="w">··</span><span·class="p"·data-group-id="3573110096-35">[</span><span·class="mf">16.16</span><span·class="p"·data-group-id="3573110096-35">]</span><span·class="w">271 </span><span·class="nc">gen</span><span·class="p">:</span><span·class="ss">do_call</span><span·class="p">/</span><span·class="mi">4</span><span·class="w">··················</span><span·class="mi">1</span><span·class="w">·····</span><span·class="mi">16</span><span·class="w">········</span><span·class="mi">16</span><span·class="w">··</span><span·class="p"·data-group-id="1829531021-35">[</span><span·class="mf">16.16</span><span·class="p"·data-group-id="1829531021-35">]</span><span·class="w">
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3578 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the3578 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
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136 reading;·not·all·of·the·concepts·used·are·explained,·and·it·is·assumed·that·the136 reading;·not·all·of·the·concepts·used·are·explained,·and·it·is·assumed·that·the
137 <a·href="xref.html">reference·manual</a>·has·been·at·least·skimmed.</p><h2·id="module-check"·class="section-heading">137 <a·href="xref.html">reference·manual</a>·has·been·at·least·skimmed.</p><h2·id="module-check"·class="section-heading">
138 ··<a·href="#module-check"·class="hover-link">138 ··<a·href="#module-check"·class="hover-link">
139 ····<i·class="ri-link-m"·aria-hidden="true"></i>139 ····<i·class="ri-link-m"·aria-hidden="true"></i>
140 ··</a>140 ··</a>
141 ··<span·class="text">Module·Check</span>141 ··<span·class="text">Module·Check</span>
142 </h2>142 </h2>
143 <p>Assume·we·want·to·check·the·following·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4627828235-1">(</span><span·class="ss">my_module</span><span·class="p"·data-group-id="4627828235-1">)</span><span·class="p">.</span><span·class="w">143 <p>Assume·we·want·to·check·the·following·module:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3578590052-1">(</span><span·class="ss">my_module</span><span·class="p"·data-group-id="3578590052-1">)</span><span·class="p">.</span><span·class="w">
144 </span><span·class="w">144 </span><span·class="w">
145 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4627828235-2">(</span><span·class="p"·data-group-id="4627828235-3">[</span><span·class="ss">t</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="4627828235-3">]</span><span·class="p"·data-group-id="4627828235-2">)</span><span·class="p">.</span><span·class="w">145 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3578590052-2">(</span><span·class="p"·data-group-id="3578590052-3">[</span><span·class="ss">t</span><span·class="p">/</span><span·class="mi">1</span><span·class="p"·data-group-id="3578590052-3">]</span><span·class="p"·data-group-id="3578590052-2">)</span><span·class="p">.</span><span·class="w">
  
146 </span><span·class="nf">t</span><span·class="p"·data-group-id="4627828235-4">(</span><span·class="n">A</span><span·class="p"·data-group-id="4627828235-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">146 </span><span·class="nf">t</span><span·class="p"·data-group-id="3578590052-4">(</span><span·class="n">A</span><span·class="p"·data-group-id="3578590052-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
147 ··</span><span·class="nc">my_module</span><span·class="p">:</span><span·class="nf">t2</span><span·class="p"·data-group-id="4627828235-5">(</span><span·class="n">A</span><span·class="p"·data-group-id="4627828235-5">)</span><span·class="p">.</span><span·class="w">147 ··</span><span·class="nc">my_module</span><span·class="p">:</span><span·class="nf">t2</span><span·class="p"·data-group-id="3578590052-5">(</span><span·class="n">A</span><span·class="p"·data-group-id="3578590052-5">)</span><span·class="p">.</span><span·class="w">
  
148 </span><span·class="nf">t2</span><span·class="p"·data-group-id="4627828235-6">(</span><span·class="p">_</span><span·class="p"·data-group-id="4627828235-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">148 </span><span·class="nf">t2</span><span·class="p"·data-group-id="3578590052-6">(</span><span·class="p">_</span><span·class="p"·data-group-id="3578590052-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
149 ··</span><span·class="ss">true</span><span·class="p">.</span></code></pre><p>Cross·reference·data·are·read·from·BEAM·files,·so·the·first·step·when·checking149 ··</span><span·class="ss">true</span><span·class="p">.</span></code></pre><p>Cross·reference·data·are·read·from·BEAM·files,·so·the·first·step·when·checking
150 an·edited·module·is·to·compile·it:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="6389818008-1">(</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug_info</span><span·class="p"·data-group-id="6389818008-1">)</span><span·class="p">.</span><span·class="w">150 an·edited·module·is·to·compile·it:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nf">c</span><span·class="p"·data-group-id="0479326354-1">(</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">debug_info</span><span·class="p"·data-group-id="0479326354-1">)</span><span·class="p">.</span><span·class="w">
151 </span><span·class="p">.</span><span·class="o">/</span><span·class="ss">my_module</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">10</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="ss">t2</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">unused</span><span·class="w">151 </span><span·class="p">.</span><span·class="o">/</span><span·class="ss">my_module</span><span·class="p">.</span><span·class="nc">erl</span><span·class="p">:</span><span·class="mi">10</span><span·class="p">:</span><span·class="w">·</span><span·class="n">Warning</span><span·class="p">:</span><span·class="w">·</span><span·class="ss">function</span><span·class="w">·</span><span·class="ss">t2</span><span·class="p">/</span><span·class="mi">1</span><span·class="w">·</span><span·class="ss">is</span><span·class="w">·</span><span·class="ss">unused</span><span·class="w">
152 </span><span·class="p"·data-group-id="6389818008-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_module</span><span·class="p"·data-group-id="6389818008-2">}</span></code></pre><p>The·<code·class="inline">debug_info</code>·option·ensures·that·the·BEAM·file·contains·debug·information,152 </span><span·class="p"·data-group-id="0479326354-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">my_module</span><span·class="p"·data-group-id="0479326354-2">}</span></code></pre><p>The·<code·class="inline">debug_info</code>·option·ensures·that·the·BEAM·file·contains·debug·information,
153 which·makes·it·possible·to·find·unused·local·functions.</p><p>The·module·can·now·be·checked·for·calls·to153 which·makes·it·possible·to·find·unused·local·functions.</p><p>The·module·can·now·be·checked·for·calls·to
154 <a·href="xref.html#deprecated_function">deprecated·functions</a>,·calls·to154 <a·href="xref.html#deprecated_function">deprecated·functions</a>,·calls·to
155 <a·href="xref.html#undefined_function">undefined·functions</a>,·and·for·unused·local155 <a·href="xref.html#undefined_function">undefined·functions</a>,·and·for·unused·local
156 functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">m</span><span·class="p"·data-group-id="5450537588-1">(</span><span·class="ss">my_module</span><span·class="p"·data-group-id="5450537588-1">)</span><span·class="w">156 functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">m</span><span·class="p"·data-group-id="1464308896-1">(</span><span·class="ss">my_module</span><span·class="p"·data-group-id="1464308896-1">)</span><span·class="w">
157 </span><span·class="p"·data-group-id="5450537588-2">[</span><span·class="p"·data-group-id="5450537588-3">{</span><span·class="ss">deprecated</span><span·class="p">,</span><span·class="p"·data-group-id="5450537588-4">[</span><span·class="p"·data-group-id="5450537588-4">]</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·38d18e94289f71da0121d2db7cd8862dcbe397b7f4689d067cdfb3a32dda6c00·...·]-3">}</span><span·class="p">,</span><span·class="w">157 </span><span·class="p"·data-group-id="1464308896-2">[</span><span·class="p"·data-group-id="1464308896-3">{</span><span·class="ss">deprecated</span><span·class="p">,</span><span·class="p"·data-group-id="1464308896-4">[</span><span·class="p"·data-group-id="1464308896-4">]</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·24,·SHA:·53129b0680977302ed52d2c6b6a6c526c6669534b15b0e1eb6d99f89130c9c78·...·]-3">}</span><span·class="p">,</span><span·class="w">
158 ·</span><span·class="p"·data-group-id="5450537588-5">{</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="p"·data-group-id="5450537588-6">[</span><span·class="p"·data-group-id="5450537588-7">{</span><span·class="p"·data-group-id="5450537588-8">{</span><span·class="ss">m[·...·truncated·by·diffoscope;·len:·575,·SHA:·f2c5915e3d2a95e3657faec0db5a561e9275b93b8336e379afc7fb1276c39501·...·]-5">}</span><span·class="p">,</span><span·class="w">158 ·</span><span·class="p"·data-group-id="1464308896-5">{</span><span·class="ss">undefined</span><span·class="p">,</span><span·class="p"·data-group-id="1464308896-6">[</span><span·class="p"·data-group-id="1464308896-7">{</span><span·class="p"·data-group-id="1464308896-8">{</span><span·class="ss">m[·...·truncated·by·diffoscope;·len:·575,·SHA:·5ac7b8cdbab1e829ae5a4077fb50b4aa74de01d0302a3e0a9ad894b2c5e5e99e·...·]-5">}</span><span·class="p">,</span><span·class="w">
159 ·</span><span·class="p"·data-group-id="5450537588-10">{</span><span·class="ss">unused</span><span·class="p">,</span><span·class="p"·data-group-id="5450537588-11">[</span><span·class="p"·data-group-id="5450537588-12">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="s[·...·truncated·by·diffoscope;·len:·264,·SHA:·8576704d5ee9a2bae3fbdc2566c665bbb17a8dedb423e52e720e8c10ce2300c0·...·]-2">]</span></code></pre><p><code·class="inline">m/1</code>·is·also·suitable·for·checking·that·the·BEAM·file·of·a·module·that·is·about159 ·</span><span·class="p"·data-group-id="1464308896-10">{</span><span·class="ss">unused</span><span·class="p">,</span><span·class="p"·data-group-id="1464308896-11">[</span><span·class="p"·data-group-id="1464308896-12">{</span><span·class="ss">my_module</span><span·class="p">,</span><span·class="s[·...·truncated·by·diffoscope;·len:·264,·SHA:·8ff1ec01f63a7288cf581d5d3274bbf52bc18372943ef2817abe396fe0ded7d0·...·]-2">]</span></code></pre><p><code·class="inline">m/1</code>·is·also·suitable·for·checking·that·the·BEAM·file·of·a·module·that·is·about
160 to·be·loaded·into·a·running·a·system·does·not·call·any·undefined·functions.·In160 to·be·loaded·into·a·running·a·system·does·not·call·any·undefined·functions.·In
161 either·case,·the·code·path·of·the·code·server·(see·the·module·<code·class="inline">code</code>)·is·used161 either·case,·the·code·path·of·the·code·server·(see·the·module·<code·class="inline">code</code>)·is·used
162 for·finding·modules·that·export·externally·called·functions·not·exported·by·the162 for·finding·modules·that·export·externally·called·functions·not·exported·by·the
163 checked·module·itself,·so·called·<a·href="xref.html#library_module">library·modules</a>.</p><h2·id="predefined-analysis"·class="section-heading">163 checked·module·itself,·so·called·<a·href="xref.html#library_module">library·modules</a>.</p><h2·id="predefined-analysis"·class="section-heading">
164 ··<a·href="#predefined-analysis"·class="hover-link">164 ··<a·href="#predefined-analysis"·class="hover-link">
165 ····<i·class="ri-link-m"·aria-hidden="true"></i>165 ····<i·class="ri-link-m"·aria-hidden="true"></i>
166 ··</a>166 ··</a>
167 ··<span·class="text">Predefined·Analysis</span>167 ··<span·class="text">Predefined·Analysis</span>
168 </h2>168 </h2>
169 <p>In·the·last·example·the·module·to·analyze·was·given·as·an·argument·to·<code·class="inline">m/1</code>,·and169 <p>In·the·last·example·the·module·to·analyze·was·given·as·an·argument·to·<code·class="inline">m/1</code>,·and
170 the·code·path·was·(implicitly)·used·as·<a·href="xref.html#library_path">library·path</a>.·In170 the·code·path·was·(implicitly)·used·as·<a·href="xref.html#library_path">library·path</a>.·In
171 this·example·an·<a·href="xref.html#xref_server">xref·server</a>·will·be·used,·which·makes·it171 this·example·an·<a·href="xref.html#xref_server">xref·server</a>·will·be·used,·which·makes·it
172 possible·to·analyze·applications·and·releases,·and·also·to·select·the·library172 possible·to·analyze·applications·and·releases,·and·also·to·select·the·library
173 path·explicitly.</p><p>Each·Xref·server·is·referred·to·by·a·unique·name.·The·name·is·given·when173 path·explicitly.</p><p>Each·Xref·server·is·referred·to·by·a·unique·name.·The·name·is·given·when
174 creating·the·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1265854827-1">(</span><span·class="ss">s</span><span·class="p"·data-group-id="1265854827-1">)</span><span·class="p">.</span><span·class="w">174 creating·the·server:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">1&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3132084469-1">(</span><span·class="ss">s</span><span·class="p"·data-group-id="3132084469-1">)</span><span·class="p">.</span><span·class="w">
175 </span><span·class="p"·data-group-id="1265854827-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.27</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="1265854827-2">}</span></code></pre><p>Next·the·system·to·be·analyzed·is·added·to·the·Xref·server.·Here·the·system·will175 </span><span·class="p"·data-group-id="3132084469-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="o">&lt;</span><span·class="mf">0.27</span><span·class="p">.</span><span·class="mi">0</span><span·class="o">&gt;</span><span·class="p"·data-group-id="3132084469-2">}</span></code></pre><p>Next·the·system·to·be·analyzed·is·added·to·the·Xref·server.·Here·the·system·will
176 be·OTP,·so·no·library·path·will·be·needed.·Otherwise,·when·analyzing·a·system176 be·OTP,·so·no·library·path·will·be·needed.·Otherwise,·when·analyzing·a·system
177 that·uses·OTP,·the·OTP·modules·are·typically·made·library·modules·by·setting·the177 that·uses·OTP,·the·OTP·modules·are·typically·made·library·modules·by·setting·the
178 library·path·to·the·default·OTP·code·path·(or·to·<code·class="inline">code_path</code>,·see·the178 library·path·to·the·default·OTP·code·path·(or·to·<code·class="inline">code_path</code>,·see·the
179 <a·href="xref.html#code_path">reference·manual</a>).·By·default,·the·names·of·read·BEAM179 <a·href="xref.html#code_path">reference·manual</a>).·By·default,·the·names·of·read·BEAM
180 files·and·warnings·are·output·when·adding·analyzed·modules,·but·these·messages180 files·and·warnings·are·output·when·adding·analyzed·modules,·but·these·messages
181 can·be·avoided·by·setting·default·values·of·some·options:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">set_default</span><span·class="p"·data-group-id="0353448973-1">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0353448973-2">[</span><span·class="p"·data-group-id="0353448973-3">{</span><span·class="ss">verbose</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·415,·SHA:·01c8d8925dc2444923ce6c8d4e16eb79aad64699ad1a155cbb6ad83c5ce03988·...·]-1">)</span><span·class="p">.</span><span·class="w">181 can·be·avoided·by·setting·default·values·of·some·options:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">2&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">set_default</span><span·class="p"·data-group-id="5872642629-1">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5872642629-2">[</span><span·class="p"·data-group-id="5872642629-3">{</span><span·class="ss">verbose</span><span·class="p">,</span>[·...·truncated·by·diffoscope;·len:·415,·SHA:·d7185391ecb2393c77b6536a229660017b1b824ea462eba68e92e3ac9c98b0a7·...·]-1">)</span><span·class="p">.</span><span·class="w">
182 </span><span·class="ss">ok</span><span·class="gp·unselectable">182 </span><span·class="ss">ok</span><span·class="gp·unselectable">
183 3&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">add_release</span><span·class="p"·data-group-id="0353448973-5">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="0353448973-6">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·326,·SHA:·41d4af2f81075505915994c07826899dce04408b62d65043d28756fa041125aa·...·]-5">)</span><span·class="p">.</span><span·class="w">183 3&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">add_release</span><span·class="p"·data-group-id="5872642629-5">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">lib_dir</span><span·class="p"·data-group-id="5872642629-6">(</span><span·class="p"·data-grou[·...·truncated·by·diffoscope;·len:·326,·SHA:·9b654e764ebc8f66bf296b59e05aec38a6a1a5ee9c50ff3ceddacc487ff7ee9e·...·]-5">)</span><span·class="p">.</span><span·class="w">
184 </span><span·class="p"·data-group-id="0353448973-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">otp</span><span·class="p"·data-group-id="0353448973-8">}</span></code></pre><p><code·class="inline">add_release/3</code>·assumes·that·all·subdirectories·of·the·library·directory184 </span><span·class="p"·data-group-id="5872642629-8">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="ss">otp</span><span·class="p"·data-group-id="5872642629-8">}</span></code></pre><p><code·class="inline">add_release/3</code>·assumes·that·all·subdirectories·of·the·library·directory
185 returned·by·<a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#lib_dir/0"><code·class="inline">code:lib_dir()</code></a>·contain·applications;185 returned·by·<a·href="../../../../lib/kernel-10.2.6/doc/html/code.html#lib_dir/0"><code·class="inline">code:lib_dir()</code></a>·contain·applications;
186 the·effect·is·that·of·reading·all·BEAM·files·for·the·application.</p><p>It·is·now·easy·to·check·the·release·for·calls·to·undefined·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">analyze</span><span·class="p"·data-group-id="7848794617-1">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined_function_calls</span><span·class="p"·data-group-id="7848794617-1">)</span><span·class="p">.</span><span·class="w">186 the·effect·is·that·of·reading·all·BEAM·files·for·the·application.</p><p>It·is·now·easy·to·check·the·release·for·calls·to·undefined·functions:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">analyze</span><span·class="p"·data-group-id="5054282928-1">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">undefined_function_calls</span><span·class="p"·data-group-id="5054282928-1">)</span><span·class="p">.</span><span·class="w">
187 </span><span·class="p"·data-group-id="7848794617-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7848794617-3">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7848[·...·truncated·by·diffoscope;·len:·457,·SHA:·50e905ba5e60b44aac1d37e73f58c4fe1c741a2a713092de2a4c1fff27a22bcf·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·check·for·calls·to·undefined·functions·is·an·example·of·a·predefined187 </span><span·class="p"·data-group-id="5054282928-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="5054282928-3">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="5054[·...·truncated·by·diffoscope;·len:·457,·SHA:·1f40d9f15d1ba3e39f4103c42cd837574bcc38407231f6c7d710e5c57e35344d·...·]-1">)</span><span·class="p">.</span></code></pre><p>The·check·for·calls·to·undefined·functions·is·an·example·of·a·predefined
188 analysis,·probably·the·most·useful·one.·Other·examples·are·the·analyses·that188 analysis,·probably·the·most·useful·one.·Other·examples·are·the·analyses·that
189 find·unused·local·functions,·or·functions·that·call·some·given·functions.·See189 find·unused·local·functions,·or·functions·that·call·some·given·functions.·See
190 the·<a·href="xref.html#analyze">analyze/2,3</a>·functions·for·a·complete·list·of·predefined190 the·<a·href="xref.html#analyze">analyze/2,3</a>·functions·for·a·complete·list·of·predefined
191 analyses.</p><p>Each·predefined·analysis·is·a·shorthand·for·a·<a·href="xref.html#query">query</a>,·a191 analyses.</p><p>Each·predefined·analysis·is·a·shorthand·for·a·<a·href="xref.html#query">query</a>,·a
192 sentence·of·a·tiny·language·providing·cross·reference·data·as·values·of192 sentence·of·a·tiny·language·providing·cross·reference·data·as·values·of
193 <a·href="xref.html#predefined_variable">predefined·variables</a>.·The·check·for·calls·to193 <a·href="xref.html#predefined_variable">predefined·variables</a>.·The·check·for·calls·to
194 undefined·functions·can·thus·be·stated·as·a·query:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">q</span><span·class="p"·data-group-id="0171624567-1">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;(XC·-·UC)·||·(XU·-·X·-·B)&quot;</span><span·class="p"·data-group-id="0171624567-1">)</span><span·class="p">.</span><span·class="w">194 undefined·functions·can·thus·be·stated·as·a·query:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">4&gt;·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">q</span><span·class="p"·data-group-id="7216543212-1">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;(XC·-·UC)·||·(XU·-·X·-·B)&quot;</span><span·class="p"·data-group-id="7216543212-1">)</span><span·class="p">.</span><span·class="w">
195 </span><span·class="p"·data-group-id="0171624567-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="0171624567-3">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="0171624567-3">]</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·0e3b3ecc358dad10eb08d9d157418204209bf0e8233496f14c242510085df89b·...·]-2">}</span></code></pre><p>The·query·asks·for·the·restriction·of·external·calls·except·the·unresolved·calls195 </span><span·class="p"·data-group-id="7216543212-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="p"·data-group-id="7216543212-3">[</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="7216543212-3">]</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·028ff21e75a53787bbceedfd07d3b56979ad5c7c6bb238f4d5af76e6bd4a6879·...·]-2">}</span></code></pre><p>The·query·asks·for·the·restriction·of·external·calls·except·the·unresolved·calls
196 to·calls·to·functions·that·are·externally·used·but·neither·exported·nor·built-in196 to·calls·to·functions·that·are·externally·used·but·neither·exported·nor·built-in
197 functions·(the·<code·class="inline">||</code>·operator·restricts·the·used·functions·while·the·<code·class="inline">|</code>·operator197 functions·(the·<code·class="inline">||</code>·operator·restricts·the·used·functions·while·the·<code·class="inline">|</code>·operator
198 restricts·the·calling·functions).·The·<code·class="inline">-</code>·operator·returns·the·difference·of·two198 restricts·the·calling·functions).·The·<code·class="inline">-</code>·operator·returns·the·difference·of·two
199 sets,·and·the·<code·class="inline">+</code>·operator·to·be·used·below·returns·the·union·of·two·sets.</p><p>The·relationships·between·the·predefined·variables·<code·class="inline">XU</code>,·<code·class="inline">X</code>,·<code·class="inline">B</code>·and·a·few199 sets,·and·the·<code·class="inline">+</code>·operator·to·be·used·below·returns·the·union·of·two·sets.</p><p>The·relationships·between·the·predefined·variables·<code·class="inline">XU</code>,·<code·class="inline">X</code>,·<code·class="inline">B</code>·and·a·few
200 others·are·worth·elaborating·upon.·The·reference·manual·mentions·two·ways·of200 others·are·worth·elaborating·upon.·The·reference·manual·mentions·two·ways·of
201 expressing·the·set·of·all·functions,·one·that·focuses·on·how·they·are·defined:201 expressing·the·set·of·all·functions,·one·that·focuses·on·how·they·are·defined:
202 <code·class="inline">X + L + B + U</code>,·and·one·that·focuses·on·how·they·are·used:·<code·class="inline">UU + LU + XU</code>.·The202 <code·class="inline">X + L + B + U</code>,·and·one·that·focuses·on·how·they·are·used:·<code·class="inline">UU + LU + XU</code>.·The
Offset 220, 16 lines modifiedOffset 220, 16 lines modified
220 </h2>220 </h2>
221 <p>The·module·check·and·the·predefined·analyses·are·useful,·but·limited.·Sometimes221 <p>The·module·check·and·the·predefined·analyses·are·useful,·but·limited.·Sometimes
222 more·flexibility·is·needed,·for·instance·one·might·not·need·to·apply·a·graph222 more·flexibility·is·needed,·for·instance·one·might·not·need·to·apply·a·graph
223 analysis·on·all·calls,·but·some·subset·will·do·equally·well.·That·flexibility·is223 analysis·on·all·calls,·but·some·subset·will·do·equally·well.·That·flexibility·is
224 provided·with·a·simple·language.·Below·are·some·expressions·of·the·language·with224 provided·with·a·simple·language.·Below·are·some·expressions·of·the·language·with
225 comments,·focusing·on·elements·of·the·language·rather·than·providing·useful225 comments,·focusing·on·elements·of·the·language·rather·than·providing·useful
226 examples.·The·analyzed·system·is·assumed·to·be·OTP,·so·in·order·to·run·the226 examples.·The·analyzed·system·is·assumed·to·be·OTP,·so·in·order·to·run·the
227 queries,·first·evaluate·these·calls:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="1614624831-1">(</span><span·class="ss">s</span><span·class="p"·data-group-id="1614624831-1">)</span><span·class="p">.</span><span·class="w">227 queries,·first·evaluate·these·calls:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3876983275-1">(</span><span·class="ss">s</span><span·class="p"·data-group-id="3876983275-1">)</span><span·class="p">.</span><span·class="w">
228 </span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">add_release</span><span·class="p"·data-group-id="1614624831-2">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">root_dir</span><span·class="p"·data-group-id="1614624831-3">(</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·0972fef7297274cd168e7d6957d6981c032bd97341ce1fc1d102a1f122e37e49·...·]-2">)</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">xref:q(s,·&quot;(Fun)·xref·:·Mod&quot;).</code></strong>·-·All·functions·of·the·<code·class="inline">xref</code>·module.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;xref·:·Mod·*·X&quot;).</code></strong>·-·All·exported·functions·of·the·<code·class="inline">xref</code>228 </span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">add_release</span><span·class="p"·data-group-id="3876983275-2">(</span><span·class="ss">s</span><span·class="p">,</span><span·class="w">·</span><span·class="nc">code</span><span·class="p">:</span><span·class="nf">root_dir</span><span·class="p"·data-group-id="3876983275-3">(</span><span·class="p"·data-gro[·...·truncated·by·diffoscope;·len:·70,·SHA:·96e88dcaa7cb42052c1573757fb3f6f0d787d73c964c7f170f55ee85122097e5·...·]-2">)</span><span·class="p">.</span></code></pre><ul><li><p><strong><code·class="inline">xref:q(s,·&quot;(Fun)·xref·:·Mod&quot;).</code></strong>·-·All·functions·of·the·<code·class="inline">xref</code>·module.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;xref·:·Mod·*·X&quot;).</code></strong>·-·All·exported·functions·of·the·<code·class="inline">xref</code>
229 module.·The·first·operand·of·the·intersection·operator·<code·class="inline">*</code>·is·implicitly229 module.·The·first·operand·of·the·intersection·operator·<code·class="inline">*</code>·is·implicitly
230 converted·to·the·more·special·type·of·the·second·operand.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;(Mod)·tools&quot;).</code></strong>·-·All·modules·of·the·Tools·application.</p></li><li><p><strong><code·class="inline">xref:q(s,·'&quot;xref_.*&quot;·:·Mod').</code></strong>·-·All·modules·with·a·name·beginning·with230 converted·to·the·more·special·type·of·the·second·operand.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;(Mod)·tools&quot;).</code></strong>·-·All·modules·of·the·Tools·application.</p></li><li><p><strong><code·class="inline">xref:q(s,·'&quot;xref_.*&quot;·:·Mod').</code></strong>·-·All·modules·with·a·name·beginning·with
231 <code·class="inline">xref_</code>.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;#·E | X &quot;).</code></strong>·-·Number·of·calls·from·exported·functions.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;XC || L &quot;).</code></strong>·-·All·external·calls·to·local·functions.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;XC * LC&quot;).</code></strong>·-·All·calls·that·have·both·an·external·and·a·local231 <code·class="inline">xref_</code>.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;#·E | X &quot;).</code></strong>·-·Number·of·calls·from·exported·functions.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;XC || L &quot;).</code></strong>·-·All·external·calls·to·local·functions.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;XC * LC&quot;).</code></strong>·-·All·calls·that·have·both·an·external·and·a·local
232 version.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;(LLin)·(LC·*·XC)&quot;).</code></strong>·-·The·lines·where·the·local·calls·of·the232 version.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;(LLin)·(LC·*·XC)&quot;).</code></strong>·-·The·lines·where·the·local·calls·of·the
233 last·example·are·made.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;(XLin)·(LC·*·XC)&quot;).</code></strong>·-·The·lines·where·the·external·calls·of233 last·example·are·made.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;(XLin)·(LC·*·XC)&quot;).</code></strong>·-·The·lines·where·the·external·calls·of
234 the·example·before·last·are·made.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;XC·*·(ME·-·strict·ME)&quot;).</code></strong>·-·External·calls·within·some·module.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;E ||| kernel&quot;).</code></strong>·-·All·calls·within·the·Kernel·application.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;closure E | kernel || kernel&quot;).</code></strong>·-·All·direct·and·indirect234 the·example·before·last·are·made.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;XC·*·(ME·-·strict·ME)&quot;).</code></strong>·-·External·calls·within·some·module.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;E ||| kernel&quot;).</code></strong>·-·All·calls·within·the·Kernel·application.</p></li><li><p><strong><code·class="inline">xref:q(s,·&quot;closure E | kernel || kernel&quot;).</code></strong>·-·All·direct·and·indirect
235 calls·within·the·Kernel·application.·Both·the·calling·and·the·used·functions235 calls·within·the·Kernel·application.·Both·the·calling·and·the·used·functions
Offset 264, 26 lines modifiedOffset 264, 26 lines modified
264 <code·class="inline">digraph</code>·representation·of·graphs)·has·to·be·explicitly·applied.</p><p>As·an·example·of·analyzing·indirect·calls,·the·following·Erlang·function·tries264 <code·class="inline">digraph</code>·representation·of·graphs)·has·to·be·explicitly·applied.</p><p>As·an·example·of·analyzing·indirect·calls,·the·following·Erlang·function·tries
265 to·answer·the·question:·if·we·want·to·know·which·modules·are·used·indirectly·by265 to·answer·the·question:·if·we·want·to·know·which·modules·are·used·indirectly·by
266 some·module(s),·is·it·worth·while·using·the266 some·module(s),·is·it·worth·while·using·the
267 <a·href="xref.html#call_graph">function·graph</a>·rather·than·the·module·graph?·Recall·that267 <a·href="xref.html#call_graph">function·graph</a>·rather·than·the·module·graph?·Recall·that
268 a·module·M1·is·said·to·call·a·module·M2·if·there·is·some·function·in·M1·that268 a·module·M1·is·said·to·call·a·module·M2·if·there·is·some·function·in·M1·that
269 calls·some·function·in·M2.·It·would·be·nice·if·we·could·use·the·much·smaller269 calls·some·function·in·M2.·It·would·be·nice·if·we·could·use·the·much·smaller
270 module·graph,·since·it·is·available·also·in·the·light·weight270 module·graph,·since·it·is·available·also·in·the·light·weight
271 <code·class="inline">modules</code><a·href="xref.html#mode">mode</a>·of·Xref·servers.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t</span><span·class="p"·data-group-id="0785178013-1">(</span><span·class="n">S</span><span·class="p"·data-group-id="0785178013-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">271 <code·class="inline">modules</code><a·href="xref.html#mode">mode</a>·of·Xref·servers.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">t</span><span·class="p"·data-group-id="7530537815-1">(</span><span·class="n">S</span><span·class="p"·data-group-id="7530537815-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
272 ··</span><span·class="p"·data-group-id="0785178013-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="0785178013-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·285,·SHA:·a8610e9a1a6c5271ac1df08068e0f7b11f40ac8e06cd308e58b3826a55017e0c·...·]-3">)</span><span·class="p">,</span><span·class="w">272 ··</span><span·class="p"·data-group-id="7530537815-2">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="p"·data-group-id="7530537815-2">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class[·...·truncated·by·diffoscope;·len:·285,·SHA:·be3a9e7d63bd6fdbf6ab9eebb03737d7db84adf4bf773ad241777bda90510576·...·]-3">)</span><span·class="p">,</span><span·class="w">
273 ··</span><span·class="p"·data-group-id="0785178013-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ms</span><span·class="p"·data-group-id="0785178013-4">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·270,·SHA:·38d15d0aac97d725fd0e489fecd14c72774c92fcf2a2d3a5d75c6818f0cc924f·...·]-5">)</span><span·class="p">,</span><span·class="w">273 ··</span><span·class="p"·data-group-id="7530537815-4">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ms</span><span·class="p"·data-group-id="7530537815-4">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·270,·SHA:·d3f811914cad6b2b48f0b0c05556f840773512ddd4501bdcaed3af75063b5601·...·]-5">)</span><span·class="p">,</span><span·class="w">
274 ··</span><span·class="n">Fun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0785178013-6">(</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="0785178013-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">274 ··</span><span·class="n">Fun</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7530537815-6">(</span><span·class="n">M</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N</span><span·class="p"·data-group-id="7530537815-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
275 ······</span><span·class="n">Q</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="0785178013-7">(</span><span·class="s">&quot;#·(Mod)·(Eplus·|·</span><span·class="si">~p</span><span·class="s">·:·Mod)&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="0785178013-8">[</span><span·class="n">M</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·0ae5b7f91f641fe16ca03ca5f65975239091e083966ca1ccbe71d1f4e5f8b695·...·]-7">)</span><span·class="p">,</span><span·class="w">275 ······</span><span·class="n">Q</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">io_lib</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="7530537815-7">(</span><span·class="s">&quot;#·(Mod)·(Eplus·|·</span><span·class="si">~p</span><span·class="s">·:·Mod)&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="7530537815-8">[</span><span·class="n">M</span><[·...·truncated·by·diffoscope;·len:·93,·SHA:·65e12ee71f7af24be077755302b5285d62cac1b502cc16722d5788dd8547903b·...·]-7">)</span><span·class="p">,</span><span·class="w">
276 ······</span><span·class="p"·data-group-id="0785178013-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N0</span><span·class="p"·data-group-id="0785178013-9">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·450,·SHA:·a6e1215cd8d4eea79ad213327c09d29741ade98ce176a119312d899b5401f460·...·]-10">)</span><span·class="p">,</span><span·class="w">276 ······</span><span·class="p"·data-group-id="7530537815-9">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">N0</span><span·class="p"·data-group-id="7530537815-9">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·clas[·...·truncated·by·diffoscope;·len:·450,·SHA:·860acd93e563aecf1331e079ade133aecf15359a52411c29f5ba054ddf1f9b48·...·]-10">)</span><span·class="p">,</span><span·class="w">
277 ······</span><span·class="n">N</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">N0</span><span·class="w">277 ······</span><span·class="n">N</span><span·class="w">·</span><span·class="o">+</span><span·class="w">·</span><span·class="n">N0</span><span·class="w">
278 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">278 ····</span><span·class="k">end</span><span·class="p">,</span><span·class="w">
279 ··</span><span·class="n">Sum</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="0785178013-12">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ms</span><span·class="p"·data-group-id="0785178013-12">)</span><span·class="p">,</span><span·class="w">279 ··</span><span·class="n">Sum</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">foldl</span><span·class="p"·data-group-id="7530537815-12">(</span><span·class="n">Fun</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">0</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Ms</span><span·class="p"·data-group-id="7530537815-12">)</span><span·class="p">,</span><span·class="w">
280 ··</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">forget</span><span·class="p"·data-group-id="0785178013-13">(</span><span·class="n">S</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Eplus&#39;</span><span·class="p"·data-group-id="0785178013-13">)</span><span·class="p">,</span><span·class="w">280 ··</span><span·class="ss">ok</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xref</span><span·class="p">:</span><span·class="nf">forget</span><span·class="p"·data-group-id="7530537815-13">(</span><span·class="n">S</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">&#39;Eplus&#39;</span><span·class="p"·data-group-id="7530537815-13">)</span><span·class="p">,</span><span·class="w">
281 ··</span><span·class="p"·data-group-id="0785178013-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tot</span><span·class="p"·data-group-id="0785178013-14">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·291,·SHA:·ad0d5fdf7d3bcc185b40f8f528e3cf085fdcb5d3f2b7b911d910febd0392d0b0·...·]-15">)</span><span·class="p">,</span><span·class="w">281 ··</span><span·class="p"·data-group-id="7530537815-14">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Tot</span><span·class="p"·data-group-id="7530537815-14">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·c[·...·truncated·by·diffoscope;·len:·291,·SHA:·1b648f1e370619959f7cd06b4f10229f480255dd4efd98a110a46f9fb1dd134a·...·]-15">)</span><span·class="p">,</span><span·class="w">
282 ··</span><span·class="mi">100</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="p"·data-group-id="0785178013-16">(</span><span·class="p"·data-group-id="0785178013-17">(</span><span·class="n">Tot</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="0785178013-17">)</span><[·...·truncated·by·diffoscope;·len:·138,·SHA:·c108402dbc4c5761bc914c46b5a6c80bc87aea23be5c2463281b2aced4a85c5a·...·]-16">)</span><span·class="p">.</span></code></pre><p>Comments·on·the·code:</p><ul><li>We·want·to·find·the·reduction·of·the·closure·of·the·function·graph·to·modules.282 ··</span><span·class="mi">100</span><span·class="w">·</span><span·class="o">*</span><span·class="w">·</span><span·class="p"·data-group-id="7530537815-16">(</span><span·class="p"·data-group-id="7530537815-17">(</span><span·class="n">Tot</span><span·class="w">·</span><span·class="o">-</span><span·class="w">·</span><span·class="n">Sum</span><span·class="p"·data-group-id="7530537815-17">)</span><[·...·truncated·by·diffoscope;·len:·138,·SHA:·1807b5bdbad30f9d30253bce3d3ce392767e6c1477a53c58a30a9ac778aeeaac·...·]-16">)</span><span·class="p">.</span></code></pre><p>Comments·on·the·code:</p><ul><li>We·want·to·find·the·reduction·of·the·closure·of·the·function·graph·to·modules.
283 The·direct·expression·for·doing·that·would·be·<code·class="inline">(Mod) (closure E | AM)</code>,·but283 The·direct·expression·for·doing·that·would·be·<code·class="inline">(Mod) (closure E | AM)</code>,·but
284 then·we·would·have·to·represent·all·of·the·transitive·closure·of·E·in·memory.284 then·we·would·have·to·represent·all·of·the·transitive·closure·of·E·in·memory.
285 Instead·the·number·of·indirectly·used·modules·is·found·for·each·analyzed285 Instead·the·number·of·indirectly·used·modules·is·found·for·each·analyzed
286 module,·and·the·sum·over·all·modules·is·calculated.</li><li>A·user·variable·is·employed·for·holding·the·<code·class="inline">digraph</code>·representation·of·the286 module,·and·the·sum·over·all·modules·is·calculated.</li><li>A·user·variable·is·employed·for·holding·the·<code·class="inline">digraph</code>·representation·of·the
287 function·graph·for·use·in·many·queries.·The·reason·is·efficiency.·As·opposed287 function·graph·for·use·in·many·queries.·The·reason·is·efficiency.·As·opposed
288 to·the·<code·class="inline">=</code>·operator,·the·<code·class="inline">:=</code>·operator·saves·a·value·for·subsequent·analyses.288 to·the·<code·class="inline">=</code>·operator,·the·<code·class="inline">:=</code>·operator·saves·a·value·for·subsequent·analyses.
289 Here·might·be·the·place·to·note·that·equal·subexpressions·within·a·query·are289 Here·might·be·the·place·to·note·that·equal·subexpressions·within·a·query·are
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350 ······<p·class="built-using">350 ······<p·class="built-using">
351 ········Built·using351 ········Built·using
352 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the352 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
353 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>353 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
354 ······</p>354 ······</p>
355 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>355 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
356 ····</footer>356 ····</footer>
357 ··</div>357 ··</div>
358 </main>358 </main>
359 </div>359 </div>
360 <script>360 <script>
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144 ········Built·using144 ········Built·using
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146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>146 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
147 ······</p>147 ······</p>
148 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>148 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
149 ····</footer>149 ····</footer>
150 ··</div>150 ··</div>
151 </main>151 </main>
152 </div>152 </div>
153 <script>153 <script>
154 ··function·mermaidLoaded()·{154 ··function·mermaidLoaded()·{
155 ····mermaid.initialize({155 ····mermaid.initialize({
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2418 ······</p>2418 ······</p>
2419 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>2419 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
2420 ····</footer>2420 ····</footer>
2421 ··</div>2421 ··</div>
2422 </main>2422 </main>
2423 </div>2423 </div>
2424 <script>2424 <script>
2425 ··function·mermaidLoaded()·{2425 ··function·mermaidLoaded()·{
2426 ····mermaid.initialize({2426 ····mermaid.initialize({
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157 that·object.·Type·checking·is·done·so·that·a·module·only·operates·on·it's157 that·object.·Type·checking·is·done·so·that·a·module·only·operates·on·it's
158 objects·or·inherited·classes.</p><p>An·object·is·created·with·<em>new</em>·and·destroyed·with·<em>destroy</em>.·Most·functions·in158 objects·or·inherited·classes.</p><p>An·object·is·created·with·<em>new</em>·and·destroyed·with·<em>destroy</em>.·Most·functions·in
159 the·classes·are·named·the·same·as·their·C++·counterpart,·except·that·for159 the·classes·are·named·the·same·as·their·C++·counterpart,·except·that·for
160 convenience,·in·erlang·they·start·with·a·lowercase·letter·and·the·first·argument160 convenience,·in·erlang·they·start·with·a·lowercase·letter·and·the·first·argument
161 is·the·object·reference.·Optional·arguments·are·last·and·expressed·as·tagged161 is·the·object·reference.·Optional·arguments·are·last·and·expressed·as·tagged
162 tuples·in·any·order.</p><p>For·example·the·<em>wxWindow</em>·C++·class·is·implemented·in·the·<em>wxWindow</em>·erlang162 tuples·in·any·order.</p><p>For·example·the·<em>wxWindow</em>·C++·class·is·implemented·in·the·<em>wxWindow</em>·erlang
163 module·and·the·member·<em>wxWindow::CenterOnParent</em>·is·thus163 module·and·the·member·<em>wxWindow::CenterOnParent</em>·is·thus
164 <em>wxWindow:centerOnParent</em>.·The·following·C++·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="ss">wxWindow</span><span·class="w">·</span><span·class="n">MyWin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">new</span><span·class="w">·</span><span·class="nf">wxWindow</span><span·class="p"·data-group-id="5793481428-1">(</span><span·class="p"·data-group-id="5793481428-1">)</span><span·class="p">;</span><span·class="w">164 <em>wxWindow:centerOnParent</em>.·The·following·C++·code:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="ss">wxWindow</span><span·class="w">·</span><span·class="n">MyWin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">new</span><span·class="w">·</span><span·class="nf">wxWindow</span><span·class="p"·data-group-id="9398046730-1">(</span><span·class="p"·data-group-id="9398046730-1">)</span><span·class="p">;</span><span·class="w">
165 ··</span><span·class="n">MyWin</span><span·class="p">.</span><span·class="n">CenterOnParent</span><span·class="p"·data-group-id="5793481428-2">(</span><span·class="ss">wxVERTICAL</span><span·class="p"·data-group-id="5793481428-2">)</span><span·class="p">;</span><span·class="w">165 ··</span><span·class="n">MyWin</span><span·class="p">.</span><span·class="n">CenterOnParent</span><span·class="p"·data-group-id="9398046730-2">(</span><span·class="ss">wxVERTICAL</span><span·class="p"·data-group-id="9398046730-2">)</span><span·class="p">;</span><span·class="w">
166 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">166 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
167 ··</span><span·class="ss">delete</span><span·class="w">·</span><span·class="n">MyWin</span><span·class="p">;</span></code></pre><p>would·in·erlang·look·like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="n">MyWin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wxWindow</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="9033448380-1">(</span><span·class="p"·data-group-id="9033448380-1">)</span><span·class="p">,</span><span·class="w">167 ··</span><span·class="ss">delete</span><span·class="w">·</span><span·class="n">MyWin</span><span·class="p">;</span></code></pre><p>would·in·erlang·look·like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="n">MyWin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wxWindow</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="3941926272-1">(</span><span·class="p"·data-group-id="3941926272-1">)</span><span·class="p">,</span><span·class="w">
168 ··</span><span·class="nc">wxWindow</span><span·class="p">:</span><span·class="nf">centerOnParent</span><span·class="p"·data-group-id="9033448380-2">(</span><span·class="n">MyWin</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9033448380-3">[</span><span·class="p"·data-group-id="9033448380-4">{</span><span·class="ss">dir</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·204,·SHA:·d2601f6a5e35442672495226bebf2cc3c58135555779fb82016569feffe75e45·...·]-2">)</span><span·class="p">,</span><span·class="w">168 ··</span><span·class="nc">wxWindow</span><span·class="p">:</span><span·class="nf">centerOnParent</span><span·class="p"·data-group-id="3941926272-2">(</span><span·class="n">MyWin</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3941926272-3">[</span><span·class="p"·data-group-id="3941926272-4">{</span><span·class="ss">dir</span><span·class="p">,</span><[·...·truncated·by·diffoscope;·len:·204,·SHA:·84a34b8e5d6a49f3472798a3c84cc66b7486cc46fc01b92bbe7083e158e2f727·...·]-2">)</span><span·class="p">,</span><span·class="w">
169 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">169 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
170 ··</span><span·class="nc">wxWindow</span><span·class="p">:</span><span·class="nf">destroy</span><span·class="p"·data-group-id="9033448380-5">(</span><span·class="n">MyWin</span><span·class="p"·data-group-id="9033448380-5">)</span><span·class="p">,</span></code></pre><p>When·you·are·reading·wxWidgets·documentation·or·the·examples,·you·will·notice170 ··</span><span·class="nc">wxWindow</span><span·class="p">:</span><span·class="nf">destroy</span><span·class="p"·data-group-id="3941926272-5">(</span><span·class="n">MyWin</span><span·class="p"·data-group-id="3941926272-5">)</span><span·class="p">,</span></code></pre><p>When·you·are·reading·wxWidgets·documentation·or·the·examples,·you·will·notice
171 that·some·of·the·most·basic·classes·are·missing·in·<em>wx</em>,·they·are·directly171 that·some·of·the·most·basic·classes·are·missing·in·<em>wx</em>,·they·are·directly
172 mapped·to·corresponding·erlang·terms:</p><ul><li><p><strong><em>wxPoint</em>·is·represented·by·{Xcoord,Ycoord}</strong></p></li><li><p><strong><em>wxSize</em>·is·represented·by·{Width,Height}</strong></p></li><li><p><strong><em>wxRect</em>·is·represented·by·{Xcoord,Ycoord,Width,Height}</strong></p></li><li><p><strong><em>wxColour</em>·is·represented·by·{Red,Green,Blue[,Alpha]}</strong></p></li><li><p><strong><em>wxString</em>·is·represented·by172 mapped·to·corresponding·erlang·terms:</p><ul><li><p><strong><em>wxPoint</em>·is·represented·by·{Xcoord,Ycoord}</strong></p></li><li><p><strong><em>wxSize</em>·is·represented·by·{Width,Height}</strong></p></li><li><p><strong><em>wxRect</em>·is·represented·by·{Xcoord,Ycoord,Width,Height}</strong></p></li><li><p><strong><em>wxColour</em>·is·represented·by·{Red,Green,Blue[,Alpha]}</strong></p></li><li><p><strong><em>wxString</em>·is·represented·by
173 <a·href="../../../../lib/stdlib-6.2.2/doc/html/unicode.html#t:charlist/0">unicode:charlist()</a></strong></p></li><li><p><strong><em>wxGBPosition</em>·is·represented·by·{Row,Column}</strong></p></li><li><p><strong><em>wxGBSpan</em>·is·represented·by·{RowSpan,ColumnSPan}</strong></p></li><li><p><strong><em>wxGridCellCoords</em>·is·represented·by·{Row,Column}</strong></p></li></ul><p>In·the·places·where·the·erlang·API·differs·from·the·original·one·it·should·be173 <a·href="../../../../lib/stdlib-6.2.2/doc/html/unicode.html#t:charlist/0">unicode:charlist()</a></strong></p></li><li><p><strong><em>wxGBPosition</em>·is·represented·by·{Row,Column}</strong></p></li><li><p><strong><em>wxGBSpan</em>·is·represented·by·{RowSpan,ColumnSPan}</strong></p></li><li><p><strong><em>wxGridCellCoords</em>·is·represented·by·{Row,Column}</strong></p></li></ul><p>In·the·places·where·the·erlang·API·differs·from·the·original·one·it·should·be
174 obvious·from·the·erlang·documentation·which·representation·has·been·used.·E.g.174 obvious·from·the·erlang·documentation·which·representation·has·been·used.·E.g.
175 the·C++·arrays·and/or·lists·are·sometimes·represented·as·erlang·lists·and175 the·C++·arrays·and/or·lists·are·sometimes·represented·as·erlang·lists·and
176 sometimes·as·tuples.</p><p>Colours·are·represented·with·{Red,Green,Blue[,Alpha]},·the·Alpha·value·is176 sometimes·as·tuples.</p><p>Colours·are·represented·with·{Red,Green,Blue[,Alpha]},·the·Alpha·value·is
177 optional·when·used·as·an·argument·to·functions,·but·it·will·always·be·returned177 optional·when·used·as·an·argument·to·functions,·but·it·will·always·be·returned
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191 ··<span·class="text">Multiple·processes·and·memory·handling</span>191 ··<span·class="text">Multiple·processes·and·memory·handling</span>
192 </h2>192 </h2>
193 <p>The·intention·is·that·each·erlang·application·calls·wx:new()·once·to·setup·it's193 <p>The·intention·is·that·each·erlang·application·calls·wx:new()·once·to·setup·it's
194 GUI·which·creates·an·environment·and·a·memory·mapping.·To·be·able·to·use·<em>wx</em>194 GUI·which·creates·an·environment·and·a·memory·mapping.·To·be·able·to·use·<em>wx</em>
195 from·several·processes·in·your·application,·you·must·share·the·environment.·You195 from·several·processes·in·your·application,·you·must·share·the·environment.·You
196 can·get·the·active·environment·with·<a·href="wx.html#get_env/0"><code·class="inline">wx:get_env/0</code></a>·and·set·it·in·the·new196 can·get·the·active·environment·with·<a·href="wx.html#get_env/0"><code·class="inline">wx:get_env/0</code></a>·and·set·it·in·the·new
197 processes·with·<a·href="wx.html#set_env/1"><code·class="inline">wx:set_env/1</code></a>.·Two·processes·or·applications·which·have·both197 processes·with·<a·href="wx.html#set_env/1"><code·class="inline">wx:set_env/1</code></a>.·Two·processes·or·applications·which·have·both
198 called·wx:new()·will·not·be·able·use·each·others·objects.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="4730210071-1">(</span><span·class="p"·data-group-id="4730210071-1">)</span><span·class="p">,</span><span·class="w">198 called·wx:new()·will·not·be·able·use·each·others·objects.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="9198628942-1">(</span><span·class="p"·data-group-id="9198628942-1">)</span><span·class="p">,</span><span·class="w">
199 ··</span><span·class="n">MyWin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wxFrame</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="4730210071-2">(</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">null</span><span·class="p"·data-group-id="4730210071-3">(</span><span·class="p"·data-group-id="4730210071-3">)</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·309,·SHA:·7b4ced413445e6d64fef22dd4a688cd0d280acd4d9ae957ebe36f97357af199d·...·]-2">)</span><span·class="p">,</span><span·class="w">199 ··</span><span·class="n">MyWin</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wxFrame</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="9198628942-2">(</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">null</span><span·class="p"·data-group-id="9198628942-3">(</span><span·class="p"·data-group-id="9198628942-3">)</span><span·class="p">,</span><span·class="w">·</span><s[·...·truncated·by·diffoscope;·len:·309,·SHA:·f5d2e0a3512daf611bf4c804238ea68e6777bee9c783f15d8442e343a11d29d8·...·]-2">)</span><span·class="p">,</span><span·class="w">
200 ··</span><span·class="n">Env</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">get_env</span><span·class="p"·data-group-id="4730210071-5">(</span><span·class="p"·data-group-id="4730210071-5">)</span><span·class="p">,</span><span·class="w">200 ··</span><span·class="n">Env</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">get_env</span><span·class="p"·data-group-id="9198628942-5">(</span><span·class="p"·data-group-id="9198628942-5">)</span><span·class="p">,</span><span·class="w">
201 ··</span><span·class="nf">spawn</span><span·class="p"·data-group-id="4730210071-6">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="4730210071-7">(</span><span·class="p"·data-group-id="4730210071-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">201 ··</span><span·class="nf">spawn</span><span·class="p"·data-group-id="9198628942-6">(</span><span·class="nf">fun</span><span·class="p"·data-group-id="9198628942-7">(</span><span·class="p"·data-group-id="9198628942-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
202 ···········</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">set_env</span><span·class="p"·data-group-id="4730210071-8">(</span><span·class="n">Env</span><span·class="p"·data-group-id="4730210071-8">)</span><span·class="p">,</span><span·class="w">202 ···········</span><span·class="nc">wx</span><span·class="p">:</span><span·class="nf">set_env</span><span·class="p"·data-group-id="9198628942-8">(</span><span·class="n">Env</span><span·class="p"·data-group-id="9198628942-8">)</span><span·class="p">,</span><span·class="w">
203 ···········</span><span·class="c1">%%·Here·you·can·do·wx·calls·from·your·helper·process.</span><span·class="w">203 ···········</span><span·class="c1">%%·Here·you·can·do·wx·calls·from·your·helper·process.</span><span·class="w">
204 ···········</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">204 ···········</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
205 ········</span><span·class="k">end</span><span·class="p"·data-group-id="4730210071-6">)</span><span·class="p">,</span><span·class="w">205 ········</span><span·class="k">end</span><span·class="p"·data-group-id="9198628942-6">)</span><span·class="p">,</span><span·class="w">
206 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>When·<a·href="wx.html#destroy/0"><code·class="inline">wx:destroy/0</code></a>·is·invoked·or·when·all·processes·in·the·application·have206 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><p>When·<a·href="wx.html#destroy/0"><code·class="inline">wx:destroy/0</code></a>·is·invoked·or·when·all·processes·in·the·application·have
207 died,·the·memory·is·deleted·and·all·windows·created·by·that·application·are207 died,·the·memory·is·deleted·and·all·windows·created·by·that·application·are
208 closed.</p><p>The·<em>wx</em>·application·never·cleans·or·garbage·collects·memory·as·long·as·the·user208 closed.</p><p>The·<em>wx</em>·application·never·cleans·or·garbage·collects·memory·as·long·as·the·user
209 application·is·alive.·Most·of·the·objects·are·deleted·when·a·window·is·closed,209 application·is·alive.·Most·of·the·objects·are·deleted·when·a·window·is·closed,
210 or·at·least·all·the·objects·which·have·a·parent·argument·that·is·non·null.·By210 or·at·least·all·the·objects·which·have·a·parent·argument·that·is·non·null.·By
211 using·<code·class="inline">wxCLASS:destroy/1</code>·when·possible·you·can·avoid·an·increasing·memory211 using·<code·class="inline">wxCLASS:destroy/1</code>·when·possible·you·can·avoid·an·increasing·memory
212 usage.·This·is·especially·important·when·<em>wxWidgets</em>·assumes·or·recommends·that212 usage.·This·is·especially·important·when·<em>wxWidgets</em>·assumes·or·recommends·that
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304 ······<p·class="built-using">304 ······<p·class="built-using">
305 ········Built·using305 ········Built·using
306 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the306 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
307 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>307 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
308 ······</p>308 ······</p>
309 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>309 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
310 ····</footer>310 ····</footer>
311 ··</div>311 ··</div>
312 </main>312 </main>
313 </div>313 </div>
314 <script>314 <script>
315 ··function·mermaidLoaded()·{315 ··function·mermaidLoaded()·{
316 ····mermaid.initialize({316 ····mermaid.initialize({
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39148 ········Built·using39148 ········Built·using
39149 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the39149 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
39150 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>39150 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
39151 ······</p>39151 ······</p>
39152 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>39152 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
39153 ····</footer>39153 ····</footer>
39154 ··</div>39154 ··</div>
39155 </main>39155 </main>
39156 </div>39156 </div>
39157 <script>39157 <script>
39158 ··function·mermaidLoaded()·{39158 ··function·mermaidLoaded()·{
39159 ····mermaid.initialize({39159 ····mermaid.initialize({
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1746 ········Built·using1746 ········Built·using
1747 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the1747 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
1748 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>1748 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
1749 ······</p>1749 ······</p>
1750 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>1750 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
1751 ····</footer>1751 ····</footer>
1752 ··</div>1752 ··</div>
1753 </main>1753 </main>
1754 </div>1754 </div>
1755 <script>1755 <script>
1756 ··function·mermaidLoaded()·{1756 ··function·mermaidLoaded()·{
1757 ····mermaid.initialize({1757 ····mermaid.initialize({
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312 ······</p>312 ······</p>
313 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>313 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
314 ····</footer>314 ····</footer>
315 ··</div>315 ··</div>
316 </main>316 </main>
317 </div>317 </div>
318 <script>318 <script>
319 ··function·mermaidLoaded()·{319 ··function·mermaidLoaded()·{
320 ····mermaid.initialize({320 ····mermaid.initialize({
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294 ······</p>294 ······</p>
295 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>295 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
296 ····</footer>296 ····</footer>
297 ··</div>297 ··</div>
298 </main>298 </main>
299 </div>299 </div>
300 <script>300 <script>
301 ··function·mermaidLoaded()·{301 ··function·mermaidLoaded()·{
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1423 ····</footer>1423 ····</footer>
1424 ··</div>1424 ··</div>
1425 </main>1425 </main>
1426 </div>1426 </div>
1427 <script>1427 <script>
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1308 ····</footer>1308 ····</footer>
1309 ··</div>1309 ··</div>
1310 </main>1310 </main>
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1312 <script>1312 <script>
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132 works·like·a·regular·gen_server·module·and·creates·a·server·per·object.</p><p>NOTE:·Currently·no·form·of·inheritance·is·implemented.</p><p>The·user·module·should·export:</p><p>init(Args)·should·return<br/>{wxWindow,·State}·|·{wxWindow,·State,·Timeout}·|·ignore·|·{stop,·Reason}</p><p>Asynchronous·window·event·handling:<br/>handle_event(#wx{},·State)·should·return<br/>{noreply,·State}·|·{noreply,·State,·Timeout}·|·{stop,·Reason,·State}</p><p>The·user·module·can·export·the·following·callback·functions:</p><p>handle_call(Msg,·{From,·Tag},·State)·should·return<br/>{reply,·Reply,·State}·|·{reply,·Reply,·State,·Timeout}·|·{noreply,·State}132 works·like·a·regular·gen_server·module·and·creates·a·server·per·object.</p><p>NOTE:·Currently·no·form·of·inheritance·is·implemented.</p><p>The·user·module·should·export:</p><p>init(Args)·should·return<br/>{wxWindow,·State}·|·{wxWindow,·State,·Timeout}·|·ignore·|·{stop,·Reason}</p><p>Asynchronous·window·event·handling:<br/>handle_event(#wx{},·State)·should·return<br/>{noreply,·State}·|·{noreply,·State,·Timeout}·|·{stop,·Reason,·State}</p><p>The·user·module·can·export·the·following·callback·functions:</p><p>handle_call(Msg,·{From,·Tag},·State)·should·return<br/>{reply,·Reply,·State}·|·{reply,·Reply,·State,·Timeout}·|·{noreply,·State}
133 |·{noreply,·State,·Timeout}·|·{stop,·Reason,·Reply,·State}</p><p>handle_cast(Msg,·State)·should·return<br/>{noreply,·State}·|·{noreply,·State,·Timeout}·|·{stop,·Reason,·State}</p><p>If·the·above·are·not·exported·but·called,·the·wx_object·process·will·crash.·The133 |·{noreply,·State,·Timeout}·|·{stop,·Reason,·Reply,·State}</p><p>handle_cast(Msg,·State)·should·return<br/>{noreply,·State}·|·{noreply,·State,·Timeout}·|·{stop,·Reason,·State}</p><p>If·the·above·are·not·exported·but·called,·the·wx_object·process·will·crash.·The
134 user·module·can·also·export:</p><p>Info·is·message·e.g.·{'EXIT',·P,·R},·{nodedown,·N},·...<br/>handle_info(Info,·State)·should·return·,·...<br/>{noreply,·State}·|·{noreply,·State,·Timeout}·|·{stop,·Reason,·State}</p><p>If·a·message·is·sent·to·the·wx_object·process·when·handle_info·is·not·exported,134 user·module·can·also·export:</p><p>Info·is·message·e.g.·{'EXIT',·P,·R},·{nodedown,·N},·...<br/>handle_info(Info,·State)·should·return·,·...<br/>{noreply,·State}·|·{noreply,·State,·Timeout}·|·{stop,·Reason,·State}</p><p>If·a·message·is·sent·to·the·wx_object·process·when·handle_info·is·not·exported,
135 the·message·will·be·dropped·and·ignored.</p><p>When·stop·is·returned·in·one·of·the·functions·above·with·Reason·=·normal·|135 the·message·will·be·dropped·and·ignored.</p><p>When·stop·is·returned·in·one·of·the·functions·above·with·Reason·=·normal·|
136 shutdown·|·Term,·terminate(State)·is·called.·It·lets·the·user·module·clean·up,136 shutdown·|·Term,·terminate(State)·is·called.·It·lets·the·user·module·clean·up,
137 it·is·always·called·when·server·terminates·or·when·wx_object()·in·the·driver·is137 it·is·always·called·when·server·terminates·or·when·wx_object()·in·the·driver·is
138 deleted.·If·the·Parent·process·terminates·the·Module:terminate/2·function·is138 deleted.·If·the·Parent·process·terminates·the·Module:terminate/2·function·is
139 called.<br/>terminate(Reason,·State)</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="3620789343-1">(</span><span·class="ss">myDialog</span><span·class="p"·data-group-id="3620789343-1">)</span><span·class="p">.</span><span·class="w">139 called.<br/>terminate(Reason,·State)</p><p>Example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">··</span><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="9184615568-1">(</span><span·class="ss">myDialog</span><span·class="p"·data-group-id="9184615568-1">)</span><span·class="p">.</span><span·class="w">
140 </span><span·class="w">··</span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3620789343-2">(</span><span·class="p"·data-group-id="3620789343-3">[</span><span·class="ss">new</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">show</span><span·class="p">/</span><span[·...·truncated·by·diffoscope;·len:·242,·SHA:·b66012b28f23c09d3863cf7402f4481cec0fe062ca09cb464970309a9e64ca07·...·]-2">)</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%%·API</span><span·class="w">140 </span><span·class="w">··</span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9184615568-2">(</span><span·class="p"·data-group-id="9184615568-3">[</span><span·class="ss">new</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">show</span><span·class="p">/</span><span[·...·truncated·by·diffoscope;·len:·242,·SHA:·555b89b37f2c244e15a5b876d83a5ec3377fd6ef60e1156da9e1b893e89f1a6e·...·]-2">)</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%%·API</span><span·class="w">
141 </span><span·class="w">··</span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="3620789343-4">(</span><span·class="p"·data-group-id="3620789343-5">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">141 </span><span·class="w">··</span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="9184615568-4">(</span><span·class="p"·data-group-id="9184615568-5">[</span><span·class="ss">init</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_call</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">handle_event</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
142 ···········</span><span·class="ss">handle_info</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="3620789343-5">]</span><span·class="p"·data-group-id="3620789343-4">)</span><span·class="p">.</span><span·class="w">142 ···········</span><span·class="ss">handle_info</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">code_change</span><span·class="p">/</span><span·class="mi">3</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">terminate</span><span·class="p">/</span><span·class="mi">2</span><span·class="p"·data-group-id="9184615568-5">]</span><span·class="p"·data-group-id="9184615568-4">)</span><span·class="p">.</span><span·class="w">
143 ···········</span><span·class="ss">new</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">showModal</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">destroy</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">]</span><span·class="p">)</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%%·Callbacks</span><span·class="w">143 ···········</span><span·class="ss">new</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">showModal</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">destroy</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">]</span><span·class="p">)</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%%·Callbacks</span><span·class="w">
  
144 ··</span><span·class="c1">%%·Client·API</span><span·class="w">144 ··</span><span·class="c1">%%·Client·API</span><span·class="w">
145 ··</span><span·class="nf">new</span><span·class="p"·data-group-id="3620789343-6">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="3620789343-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">145 ··</span><span·class="nf">new</span><span·class="p"·data-group-id="9184615568-6">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Msg</span><span·class="p"·data-group-id="9184615568-6">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
146 ·····</span><span·class="nc">wx_object</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="3620789343-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3620789343-8">[</span><span·class="n">Parent</span><span·class="p">,</span><span·class="n">Id</span><s[·...·truncated·by·diffoscope;·len:·246,·SHA:·4bb0673eefeec9af3166eb4adc2b99475d5b594c3b4254b5b3a8180f53f20a3b·...·]-7">)</span><span·class="p">.</span><span·class="w">146 ·····</span><span·class="nc">wx_object</span><span·class="p">:</span><span·class="nf">start</span><span·class="p"·data-group-id="9184615568-7">(</span><span·class="o">?</span><span·class="n">MODULE</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="9184615568-8">[</span><span·class="n">Parent</span><span·class="p">,</span><span·class="n">Id</span><s[·...·truncated·by·diffoscope;·len:·246,·SHA:·cd35d44e2e5b56093456df11cad75cef5913de5cec6066a12f6b7dbd5c7fb7c5·...·]-7">)</span><span·class="p">.</span><span·class="w">
  
147 ··</span><span·class="nf">show</span><span·class="p"·data-group-id="3620789343-10">(</span><span·class="n">Dialog</span><span·class="p"·data-group-id="3620789343-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">147 ··</span><span·class="nf">show</span><span·class="p"·data-group-id="9184615568-10">(</span><span·class="n">Dialog</span><span·class="p"·data-group-id="9184615568-10">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
148 ·····</span><span·class="nc">wx_object</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3620789343-11">(</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">show_modal</span><span·class="p"·data-group-id="3620789343-11">)</span><span·class="p">.</span><span·class="w">148 ·····</span><span·class="nc">wx_object</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9184615568-11">(</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">show_modal</span><span·class="p"·data-group-id="9184615568-11">)</span><span·class="p">.</span><span·class="w">
  
149 ··</span><span·class="nf">destroy</span><span·class="p"·data-group-id="3620789343-12">(</span><span·class="n">Dialog</span><span·class="p"·data-group-id="3620789343-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">149 ··</span><span·class="nf">destroy</span><span·class="p"·data-group-id="9184615568-12">(</span><span·class="n">Dialog</span><span·class="p"·data-group-id="9184615568-12">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
150 ·····</span><span·class="nc">wx_object</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="3620789343-13">(</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">destroy</span><span·class="p"·data-group-id="3620789343-13">)</span><span·class="p">.</span><span·class="w">150 ·····</span><span·class="nc">wx_object</span><span·class="p">:</span><span·class="nf">call</span><span·class="p"·data-group-id="9184615568-13">(</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">destroy</span><span·class="p"·data-group-id="9184615568-13">)</span><span·class="p">.</span><span·class="w">
  
151 ··</span><span·class="c1">%%·Server·Implementation·ala·gen_server</span><span·class="w">151 ··</span><span·class="c1">%%·Server·Implementation·ala·gen_server</span><span·class="w">
152 ··</span><span·class="nf">init</span><span·class="p"·data-group-id="3620789343-14">(</span><span·class="p"·data-group-id="3620789343-15">[</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Str</span><span·class="p"·data-group-id="3620789343-15">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·6ab6af2d17343285f5d21f04c2b529e073dfb02a3faaf19b067e39136e9d8631·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">152 ··</span><span·class="nf">init</span><span·class="p"·data-group-id="9184615568-14">(</span><span·class="p"·data-group-id="9184615568-15">[</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Str</span><span·class="p"·data-group-id="9184615568-15">]</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·ee045dfc42d786822d29061b5e7940a19826665dcb00c8c60b554af7becd440f·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
153 ·····</span><span·class="n">Dialog</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wxDialog</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="3620789343-16">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Testing&quot;</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·157,·SHA:·01c149b62497ec0507914d82ef03b28f4da93fb34d77c765dd79d97ec18c72cf·...·]-16">)</span><span·class="p">,</span><span·class="w">153 ·····</span><span·class="n">Dialog</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">wxDialog</span><span·class="p">:</span><span·class="nf">new</span><span·class="p"·data-group-id="9184615568-16">(</span><span·class="n">Parent</span><span·class="p">,</span><span·class="w">·</span><span·class="mi">42</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;Testing&quot;</span><span·class="p">,</span><span·class="w">[·...·truncated·by·diffoscope;·len:·157,·SHA:·3f29917a84f3a71cc3c23d2cbc3957c908af1a804a56d983e2b1812eecf4dd2e·...·]-16">)</span><span·class="p">,</span><span·class="w">
154 ·····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">154 ·····</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
155 ·····</span><span·class="nc">wxDialog</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="3620789343-18">(</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">command_button_clicked</span><span·class="p"·data-group-id="3620789343-18">)</span><span·class="p">,</span><span·class="w">155 ·····</span><span·class="nc">wxDialog</span><span·class="p">:</span><span·class="nf">connect</span><span·class="p"·data-group-id="9184615568-18">(</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">command_button_clicked</span><span·class="p"·data-group-id="9184615568-18">)</span><span·class="p">,</span><span·class="w">
156 ·····</span><span·class="p"·data-group-id="3620789343-19">{</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyState</span><span·class="p"·data-group-id="3620789343-19">}</span><span·class="p">.</span><span·class="w">156 ·····</span><span·class="p"·data-group-id="9184615568-19">{</span><span·class="n">Dialog</span><span·class="p">,</span><span·class="w">·</span><span·class="n">MyState</span><span·class="p"·data-group-id="9184615568-19">}</span><span·class="p">.</span><span·class="w">
  
157 ··</span><span·class="nf">handle_call</span><span·class="p"·data-group-id="3620789343-20">(</span><span·class="ss">show</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·46b719747c86b565da9cd0254eccea52fe9ae3bfa3a1684b9bd4c7d7406acb96·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">157 ··</span><span·class="nf">handle_call</span><span·class="p"·data-group-id="9184615568-20">(</span><span·class="ss">show</span><span·class="p">,</span><span·class="w">·</span><span·class="p">_</span><span·class="n">From</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id=[·...·truncated·by·diffoscope;·len:·11,·SHA:·ac65d976ae33f5be68c27d3d752d8b8c961614971bbd8a1f7a1700e9917e5576·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
158 ·····</span><span·class="nc">wxDialog</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="3620789343-21">(</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">win</span><span·class="p"·data-group-id="3620789343-21">)</span><span·class="p">,</span><span·class="w">158 ·····</span><span·class="nc">wxDialog</span><span·class="p">:</span><span·class="nf">show</span><span·class="p"·data-group-id="9184615568-21">(</span><span·class="n">State</span><span·class="o">#</span><span·class="ss">state</span><span·class="p">.</span><span·class="ss">win</span><span·class="p"·data-group-id="9184615568-21">)</span><span·class="p">,</span><span·class="w">
159 ·····</span><span·class="p"·data-group-id="3620789343-22">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="3620789343-22">}</span><span·class="p">;</span><span·class="w">159 ·····</span><span·class="p"·data-group-id="9184615568-22">{</span><span·class="ss">reply</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="9184615568-22">}</span><span·class="p">;</span><span·class="w">
160 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">160 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
161 ··</span><span·class="nf">handle_event</span><span·class="p"·data-group-id="3620789343-23">(</span><span·class="o">#</span><span·class="ss">wx</span><span·class="p"·data-group-id="3620789343-24">{</span><span·class="p"·data-group-id="3620789343-24">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·3b694b0e347af17defd9aaa1b9f46094d5e4c3b07ccdd17a73ab030f8b5fbd15·...·]-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">161 ··</span><span·class="nf">handle_event</span><span·class="p"·data-group-id="9184615568-23">(</span><span·class="o">#</span><span·class="ss">wx</span><span·class="p"·data-group-id="9184615568-24">{</span><span·class="p"·data-group-id="9184615568-24">}</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span[·...·truncated·by·diffoscope;·len:·42,·SHA:·b7666aa0066d5450f16a59f5d09126ce42d92dc269f7687b21cc18fe24ad7493·...·]-23">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
162 ·····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="3620789343-25">(</span><span·class="s">&quot;Users·clicked·button</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="3620789343-26">[</span><span·class="p"·data-group-id="3620789343-26">]</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·cfe0599bc7c6fc4cc56e648764a680f88953cb3485690a5d3401ea3a0e3dc06c·...·]-25">)</span><span·class="p">,</span><span·class="w">162 ·····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="9184615568-25">(</span><span·class="s">&quot;Users·clicked·button</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="9184615568-26">[</span><span·class="p"·data-group-id="9184615568-26">]</sp[·...·truncated·by·diffoscope;·len:·44,·SHA:·f8713fa52bccdcb11f0836ecac4d4074386450a8a3b1b1a24b7a6270f8be56cf·...·]-25">)</span><span·class="p">,</span><span·class="w">
163 ·····</span><span·class="p"·data-group-id="3620789343-27">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="3620789343-27">}</span><span·class="p">;</span><span·class="w">163 ·····</span><span·class="p"·data-group-id="9184615568-27">{</span><span·class="ss">noreply</span><span·class="p">,</span><span·class="w">·</span><span·class="n">State</span><span·class="p"·data-group-id="9184615568-27">}</span><span·class="p">;</span><span·class="w">
164 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="module-data-types"·class="section-heading">164 ··</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span></code></pre><h2·id="module-data-types"·class="section-heading">
165 ··<a·href="#module-data-types"·class="hover-link">165 ··<a·href="#module-data-types"·class="hover-link">
166 ····<i·class="ri-link-m"·aria-hidden="true"></i>166 ····<i·class="ri-link-m"·aria-hidden="true"></i>
167 ··</a>167 ··</a>
168 ··<span·class="text">DATA·TYPES</span>168 ··<span·class="text">DATA·TYPES</span>
169 </h2>169 </h2>
170 <ul><li><p><strong><a·href=""·id="type-request_id"></a>·request_id()·=·term()</strong></p></li><li><p><strong><a·href=""·id="type-server_ref"></a>·server_ref()·=170 <ul><li><p><strong><a·href=""·id="type-request_id"></a>·request_id()·=·term()</strong></p></li><li><p><strong><a·href=""·id="type-server_ref"></a>·server_ref()·=
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145 ····</footer>145 ····</footer>
146 ··</div>146 ··</div>
147 </main>147 </main>
148 </div>148 </div>
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237 ····</footer>237 ····</footer>
238 ··</div>238 ··</div>
239 </main>239 </main>
240 </div>240 </div>
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145 </main>145 </main>
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543 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>543 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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545 ··</div>545 ··</div>
546 </main>546 </main>
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142 forms·are·<code·class="inline">{Tag, Fun}</code>,·or·<code·class="inline">{Tag, Fun, LocalState}</code>.·The·second·form·can·be·used142 forms·are·<code·class="inline">{Tag, Fun}</code>,·or·<code·class="inline">{Tag, Fun, LocalState}</code>.·The·second·form·can·be·used
143 to·initialize·the·state·variable·in·question.</p><h4>1.1·User·State</h4><p>All·customization·functions·are·free·to·access·a·&quot;User·state&quot;·variable.·Care143 to·initialize·the·state·variable·in·question.</p><h4>1.1·User·State</h4><p>All·customization·functions·are·free·to·access·a·&quot;User·state&quot;·variable.·Care
144 must·of·course·be·taken·to·coordinate·the·use·of·this·state.·It·is·recommended144 must·of·course·be·taken·to·coordinate·the·use·of·this·state.·It·is·recommended
145 that·functions,·which·do·not·really·have·anything·to·contribute·to·the·&quot;global&quot;145 that·functions,·which·do·not·really·have·anything·to·contribute·to·the·&quot;global&quot;
146 user·state,·use·their·own·state·variable·instead.·Another·option·(used·in·e.g.146 user·state,·use·their·own·state·variable·instead.·Another·option·(used·in·e.g.
147 <code·class="inline">xmerl_eventp.erl</code>)·is·for·customization·functions·to·share·one·of·the·local147 <code·class="inline">xmerl_eventp.erl</code>)·is·for·customization·functions·to·share·one·of·the·local
148 states·(in·<code·class="inline">xmerl_eventp.erl</code>,·the·continuation·function·and·the·fetch·function148 states·(in·<code·class="inline">xmerl_eventp.erl</code>,·the·continuation·function·and·the·fetch·function
149 both·access·the·cont_state.)</p><p>Functions·to·access·user·state:</p><ul><li>··<code·class="inline">xmerl_scan:user_state(GlobalState)</code></li><li>··<code·class="inline">xmerl_scan:user_state(UserState,·GlobalState)</code></li></ul><h4>1.2·Event·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1402978394-1">{</span><span·class="ss">event_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1402978394-2">(</span><span·class="p"·data-group-id="1402978394-2">)</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·493,·SHA:·54306de8967ab8869105d197ebe0c73d0b2e92cd468ede59b9af8ddf36461212·...·]4-3">}</span></code></pre><p>The·event·function·is·called·at·the·beginning·and·at·the·end·of·a·parsed·entity.149 both·access·the·cont_state.)</p><p>Functions·to·access·user·state:</p><ul><li>··<code·class="inline">xmerl_scan:user_state(GlobalState)</code></li><li>··<code·class="inline">xmerl_scan:user_state(UserState,·GlobalState)</code></li></ul><h4>1.2·Event·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3195779844-1">{</span><span·class="ss">event_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="3195779844-2">(</span><span·class="p"·data-group-id="3195779844-2">)</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·493,·SHA:·23d0286dfac6b339c039280c659f9c619cfeee42a17a2f7e8a28dd9cd458d7cb·...·]4-3">}</span></code></pre><p>The·event·function·is·called·at·the·beginning·and·at·the·end·of·a·parsed·entity.
150 It·has·the·following·format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="8231735964-1">(</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="8231735964-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">150 It·has·the·following·format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="7018292490-1">(</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="7018292490-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
151 ···</span><span·class="n">EventState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">event_state</span><span·class="p"·data-group-id="8231735964-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="8231735964-2">)</span><span·class="p">,</span><span·class="w">151 ···</span><span·class="n">EventState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">event_state</span><span·class="p"·data-group-id="7018292490-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="7018292490-2">)</span><span·class="p">,</span><span·class="w">
152 ···</span><span·class="n">EventState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="8231735964-3">(</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventState</span><span·class="p"·data-group-id="8231735964-3">)</span><span·class="p">,</span><span·class="w">152 ···</span><span·class="n">EventState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="7018292490-3">(</span><span·class="n">Event</span><span·class="p">,</span><span·class="w">·</span><span·class="n">EventState</span><span·class="p"·data-group-id="7018292490-3">)</span><span·class="p">,</span><span·class="w">
153 ···</span><span·class="n">GlobalState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">event_state</span><span·class="p"·data-group-id="8231735964-4">(</span><span·class="n">EventState2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="8231735964-4">)</span><span·class="w">153 ···</span><span·class="n">GlobalState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">event_state</span><span·class="p"·data-group-id="7018292490-4">(</span><span·class="n">EventState2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="7018292490-4">)</span><span·class="w">
154 </span><span·class="k">end</span><span·class="p">.</span></code></pre><h4>1.3·Hook·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0512953894-1">{</span><span·class="ss">hook_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0512953894-2">(</span><span·class="p"·data-group-id="0512953894-2">)</span><span·class="p"·data-group-id="0512953894-1">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="0512953894-3">{</span><span·class="ss">hook_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0512953894-4">(</span><span·class="p"·data-group-id="0512953894-4">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HookState</span><span·class="p"·data-group-id="0512953894-3">}</span></code></pre><p>The·hook·function·is·called·when·the·processor·has·parsed·a·complete·entity. 
155 Format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="2048950356-1">(</span><span·class="n">Entity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalStat[·...·truncated·by·diffoscope;·len:·129,·SHA:·9b57218179706f0be9bd5b5afd8bc3d1485cd65c4c5e6e006d857ab2e8a4ab71·...·]154 </span><span·class="k">end</span><span·class="p">.</span></code></pre><h4>1.3·Hook·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="3746042826-1">{</span><span·class="ss">hook_fun</span><span·class="p">,</span><sp[·...·truncated·by·diffoscope;·len:·770,·SHA:·5f137c76fe3a50c807a07f84220f8e69a9d4b00640eff4308789d382a1099895·...·]
 155 Format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="6885725800-1">(</span><span·class="n">Entity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6885725800-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
156 ···</span><span·class="n">HookState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">hook_state</span><span·class="p"·data-group-id="2048950356-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="2048950356-2">)</span><span·class="p">,</span><span·class="w">156 ···</span><span·class="n">HookState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">hook_state</span><span·class="p"·data-group-id="6885725800-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6885725800-2">)</span><span·class="p">,</span><span·class="w">
157 ···</span><span·class="p"·data-group-id="2048950356-3">{</span><span·class="n">TransformedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HookState2</span><span·class="p"·data-group-id="2048950356-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class=[·...·truncated·by·diffoscope;·len:·242,·SHA:·c4671a9417325ac31825fdbc4714e28004413f675a5a89fba68dafe94daad790·...·]-4">)</span><span·class="p">,</span><span·class="w">157 ···</span><span·class="p"·data-group-id="6885725800-3">{</span><span·class="n">TransformedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">HookState2</span><span·class="p"·data-group-id="6885725800-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class=[·...·truncated·by·diffoscope;·len:·242,·SHA:·deabe0f674a197afb307ea873e09e667c85f4e4d3d66d204f55793ec6c62a800·...·]-4">)</span><span·class="p">,</span><span·class="w">
158 ···</span><span·class="n">GlobalState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">hook_state</span><span·class="p"·data-group-id="2048950356-5">(</span><span·class="n">HookState2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="2048950356-5">)</span><span·class="p">,</span><span·class="w">158 ···</span><span·class="n">GlobalState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">hook_state</span><span·class="p"·data-group-id="6885725800-5">(</span><span·class="n">HookState2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6885725800-5">)</span><span·class="p">,</span><span·class="w">
159 ···</span><span·class="p"·data-group-id="2048950356-6">{</span><span·class="n">TransformedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState2</span><span·class="p"·data-group-id="2048950356-6">}</span><span·class="w">159 ···</span><span·class="p"·data-group-id="6885725800-6">{</span><span·class="n">TransformedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState2</span><span·class="p"·data-group-id="6885725800-6">}</span><span·class="w">
160 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·relationship·between·the·event·function,·the·hook·function·and·the160 </span><span·class="k">end</span><span·class="p">.</span></code></pre><p>The·relationship·between·the·event·function,·the·hook·function·and·the
161 accumulator·function·is·as·follows:</p><ol><li>·The·event·function·is·first·called·with·an·'ended'·event·for·the·parsed161 accumulator·function·is·as·follows:</p><ol><li>·The·event·function·is·first·called·with·an·'ended'·event·for·the·parsed
162 entity.</li><li>·The·hook·function·is·called,·possibly·re-formatting·the·entity.</li><li>·The·acc·function·is·called·in·order·to·(optionally)·add·the·re-formatted162 entity.</li><li>·The·hook·function·is·called,·possibly·re-formatting·the·entity.</li><li>·The·acc·function·is·called·in·order·to·(optionally)·add·the·re-formatted
163 entity·to·the·contents·of·its·parent·element.</li></ol><h4>1.4·Fetch·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9638013245-1">{</span><span·class="ss">fetch_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="9638013245-2">(</span><span·class="p"·data-group-id="9638013245-2">)</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·494,·SHA:·5114cd533f5845c718a69f79f3af3453b292a73fadae1f5d45ccac78ede11127·...·]-3">}</span></code></pre><p>The·fetch·function·is·called·in·order·to·fetch·an·external·resource·(e.g.·a163 entity·to·the·contents·of·its·parent·element.</li></ol><h4>1.4·Fetch·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="2508344118-1">{</span><span·class="ss">fetch_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="2508344118-2">(</span><span·class="p"·data-group-id="2508344118-2">)</span><span·class="p"·data[·...·truncated·by·diffoscope;·len:·494,·SHA:·d4be3917b13b25e35fb81df5a10892df3dba761ae819123cee52dcfef0a8f97c·...·]-3">}</span></code></pre><p>The·fetch·function·is·called·in·order·to·fetch·an·external·resource·(e.g.·a
164 DTD).</p><p>The·fetch·function·can·respond·with·three·different·return·values:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Result</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">164 DTD).</p><p>The·fetch·function·can·respond·with·three·different·return·values:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Result</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">
165 ···</span><span·class="p"·data-group-id="3253747645-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3253747645-2">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filename</span>[·...·truncated·by·diffoscope;·len:·179,·SHA:·e6c4beeffde9b128ec4d1749c83edad2f879863b44c883b779264dcb87521be8·...·]-1">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">165 ···</span><span·class="p"·data-group-id="6806137316-1">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6806137316-2">{</span><span·class="ss">file</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Filename</span>[·...·truncated·by·diffoscope;·len:·179,·SHA:·07e64f7bf3eeb6eae0600c4f7e59c264aa73a4cec22f9b7179aad13ff0ff3a48·...·]-1">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
166 ···</span><span·class="p"·data-group-id="3253747645-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="3253747645-4">{</span><span·class="ss">string</span><span·class="p">,</span><span·class="w">·</span><span·class="n">String</span>[·...·truncated·by·diffoscope;·len:·179,·SHA:·a81fe26828a0fbf1aaf1745d80fd2d97799ca42e5b48af1c97f9d082036189fb·...·]-3">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">166 ···</span><span·class="p"·data-group-id="6806137316-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="p"·data-group-id="6806137316-4">{</span><span·class="ss">string</span><span·class="p">,</span><span·class="w">·</span><span·class="n">String</span>[·...·truncated·by·diffoscope;·len:·179,·SHA:·8182034c545b9613473cf59271fcd2ff29245b804da0e7058e332745dc37e365·...·]-3">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w">
167 ···</span><span·class="p"·data-group-id="3253747645-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">not_fetched</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewGlobalState</span><span·class="p"·data-group-id="325374764[·...·truncated·by·diffoscope;·len:·331,·SHA:·b011cef812980ec473908c5ac2a91c102389107aedd7b6057010a975b311dac7·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">167 ···</span><span·class="p"·data-group-id="6806137316-5">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">not_fetched</span><span·class="p">,</span><span·class="w">·</span><span·class="n">NewGlobalState</span><span·class="p"·data-group-id="680613731[·...·truncated·by·diffoscope;·len:·331,·SHA:·4fbd2a0876cc9010f5e259521d976941048ee10c25bc1d59ac38e96fe7690b2b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
168 ···</span><span·class="n">FetchState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">fetch_state</span><span·class="p"·data-group-id="8058588164-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="8058588164-2">)</span><span·class="p">,</span><span·class="w">168 ···</span><span·class="n">FetchState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">fetch_state</span><span·class="p"·data-group-id="8480459366-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="8480459366-2">)</span><span·class="p">,</span><span·class="w">
169 ···</span><span·class="n">Result</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="8058588164-3">(</span><span·class="n">URI</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FetchState</span><span·class="p"·data-group-id="8058588164-3">)</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%·Result·being·one·of·the·above</span><span·class="w">169 ···</span><span·class="n">Result</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">foo</span><span·class="p"·data-group-id="8480459366-3">(</span><span·class="n">URI</span><span·class="p">,</span><span·class="w">·</span><span·class="n">FetchState</span><span·class="p"·data-group-id="8480459366-3">)</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%·Result·being·one·of·the·above</span><span·class="w">
170 </span><span·class="k">end</span><span·class="p">.</span></code></pre><h4>1.5·Continuation·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="7042757347-1">{</span><span·class="ss">continuation_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="7042757347-2">(</span><span·class="p"·data-group-id="7042757347-2">)</span><span·class="[·...·truncated·by·diffoscope;·len:·515,·SHA:·24ab6acf649772bc7862a136e809a21acc425b0ba547fc874f6065aaf092d028·...·]-3">}</span></code></pre><p>The·continuation·function·is·called·when·the·parser·encounters·the·end·of·the170 </span><span·class="k">end</span><span·class="p">.</span></code></pre><h4>1.5·Continuation·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="0197700458-1">{</span><span·class="ss">continuation_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0197700458-2">(</span><span·class="p"·data-group-id="0197700458-2">)</span><span·class="[·...·truncated·by·diffoscope;·len:·515,·SHA:·e776b3bd5e9e5bd5f712b982d38b069794bded6505f76065760abb66ba36d9cd·...·]-3">}</span></code></pre><p>The·continuation·function·is·called·when·the·parser·encounters·the·end·of·the
171 byte·stream.·Format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0497580461-1">(</span><span·class="n">Continue</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Exception</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="0497580461-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">171 byte·stream.·Format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="6623922938-1">(</span><span·class="n">Continue</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Exception</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6623922938-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
172 ···</span><span·class="n">ContState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">cont_state</span><span·class="p"·data-group-id="0497580461-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="0497580461-2">)</span><span·class="p">,</span><span·class="w">172 ···</span><span·class="n">ContState</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">cont_state</span><span·class="p"·data-group-id="6623922938-2">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6623922938-2">)</span><span·class="p">,</span><span·class="w">
173 ···</span><span·class="p"·data-group-id="0497580461-3">{</span><span·class="n">Result</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContState2</span><span·class="p"·data-group-id="0497580461-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·165,·SHA:·166990b26f1f47c2077dbf22790cef3570cb5dfa007d6ae946f71648657070c4·...·]-4">)</span><span·class="p">,</span><span·class="w">173 ···</span><span·class="p"·data-group-id="6623922938-3">{</span><span·class="n">Result</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContState2</span><span·class="p"·data-group-id="6623922938-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span[·...·truncated·by·diffoscope;·len:·165,·SHA:·e2e452d17efcf34bb1869c3a0c11cb65ba469ecf9ba431157cf1f817be8c461b·...·]-4">)</span><span·class="p">,</span><span·class="w">
174 ···</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Result</span><span·class="w">·</span><span·class="k">of</span><span·class="w">174 ···</span><span·class="k">case</span><span·class="w">·</span><span·class="n">Result</span><span·class="w">·</span><span·class="k">of</span><span·class="w">
175 ······</span><span·class="p"·data-group-id="0497580461-5">[</span><span·class="p"·data-group-id="0497580461-5">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">175 ······</span><span·class="p"·data-group-id="6623922938-5">[</span><span·class="p"·data-group-id="6623922938-5">]</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
176 ·········</span><span·class="n">GlobalState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">cont_state</span><span·class="p"·data-group-id="0497580461-6">(</span><span·class="n">ContState2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="0497580461-6">)</span><span·class="p">,</span><span·class="w">176 ·········</span><span·class="n">GlobalState2</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">cont_state</span><span·class="p"·data-group-id="6623922938-6">(</span><span·class="n">ContState2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6623922938-6">)</span><span·class="p">,</span><span·class="w">
177 ·········</span><span·class="n">Exception</span><span·class="p"·data-group-id="0497580461-7">(</span><span·class="n">GlobalState2</span><span·class="p"·data-group-id="0497580461-7">)</span><span·class="p">;</span><span·class="w">177 ·········</span><span·class="n">Exception</span><span·class="p"·data-group-id="6623922938-7">(</span><span·class="n">GlobalState2</span><span·class="p"·data-group-id="6623922938-7">)</span><span·class="p">;</span><span·class="w">
178 ······</span><span·class="n">MoreBytes</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">178 ······</span><span·class="n">MoreBytes</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
179 ·········</span><span·class="p"·data-group-id="0497580461-8">{</span><span·class="n">MoreBytes2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rest</span><span·class="p"·data-group-id="0497580461-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·171,·SHA:·117e179f953a6d637517e4836b5c1654f0932597e007c40172ac3cc5838c2da1·...·]-9">)</span><span·class="p">,</span><span·class="w">179 ·········</span><span·class="p"·data-group-id="6623922938-8">{</span><span·class="n">MoreBytes2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Rest</span><span·class="p"·data-group-id="6623922938-8">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·171,·SHA:·6f12b9c19791e25a6d9ad6d344c8b4663667a54e9fe8edf8c47bdfcc00b2ab34·...·]-9">)</span><span·class="p">,</span><span·class="w">
180 ·········</span><span·class="n">ContState3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">update_cont_state</span><span·class="p"·data-group-id="0497580461-10">(</span><span·class="n">Rest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContState2</span><span·class="p"·data-group-id="0497580461-10">)</span><span·class="p">,</span><span·class="w">180 ·········</span><span·class="n">ContState3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nf">update_cont_state</span><span·class="p"·data-group-id="6623922938-10">(</span><span·class="n">Rest</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ContState2</span><span·class="p"·data-group-id="6623922938-10">)</span><span·class="p">,</span><span·class="w">
181 ·········</span><span·class="n">GlobalState3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">cont_state</span><span·class="p"·data-group-id="0497580461-11">(</span><span·class="n">ContState3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="0497580461-11">)</span><span·class="p">,</span><span·class="w">181 ·········</span><span·class="n">GlobalState3</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">cont_state</span><span·class="p"·data-group-id="6623922938-11">(</span><span·class="n">ContState3</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="6623922938-11">)</span><span·class="p">,</span><span·class="w">
182 ·········</span><span·class="n">Continue</span><span·class="p"·data-group-id="0497580461-12">(</span><span·class="n">MoreBytes2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState3</span><span·class="p"·data-group-id="0497580461-12">)</span><span·class="w">182 ·········</span><span·class="n">Continue</span><span·class="p"·data-group-id="6623922938-12">(</span><span·class="n">MoreBytes2</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState3</span><span·class="p"·data-group-id="6623922938-12">)</span><span·class="w">
183 ···</span><span·class="k">end</span><span·class="w">183 ···</span><span·class="k">end</span><span·class="w">
184 </span><span·class="k">end</span><span·class="p">.</span></code></pre><h4>1.6·Rules·Functions</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1597837411-1">{</span><span·class="ss">rules</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ReadFun</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1597837411-2">(</span><span·class="p"·data-group-id="1597837411-2">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">WriteFun</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1597837411-3">(</span><span·class="p"·data-group-id="1597837411-3">)</span><span·class="p">,</span><span·class="w">·</span><span·class="n">RulesState</span><span·class="p"·data-group-id="1597837411-1">}</span><span·class="w">·</span><span·class="p">|</span><span·class="w"> 
185 </span><span·class="p"·data-group-id="1597837411-4">{</span><span·class="ss">rules</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Table</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">ets</span><span·class=[·...·truncated·by·diffoscope;·len:·234,·SHA:·febf582b17a538b6cb4db3bf28c6205aefd96811b9321a52c9a89a011e0228ad·...·]184 </span><span·class="k">end</span><span·class="p">.</span></code></pre><h4>1.6·Rules·Functions</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="9845984673-1">{</span><span·class="ss">rules</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·717,·SHA:·cbc2cd59b8aec3a9766216aae58a9801a1bf82a4a42dcfa2ca05d7fff3acd162·...·]
 185 </span><span·class="p"·data-group-id="9845984673-4">{</span><span·class="ss">rules</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Table</span><span·class="w">·</span><span·class="p">:</span><span·class="w">·</span><span·class="nf">ets</span><span·class="p"·data-group-id="9845984673-5">(</span><span·class="p"·data-group-id="9845984673-5">)</span><span·class="p"·data-group-id="9845984673-4">}</span></code></pre><p>The·rules·functions·take·care·of·storing·scanner·information·in·a·rules
186 database.·User-provided·rules·functions·may·opt·to·store·the·information·in186 database.·User-provided·rules·functions·may·opt·to·store·the·information·in
187 mnesia,·or·perhaps·in·the·user_state(RulesState).</p><p>The·following·modes·exist:</p><ul><li>··If·the·user·doesn't·specify·an·option,·the·scanner·creates·an·ets·table,·and187 mnesia,·or·perhaps·in·the·user_state(RulesState).</p><p>The·following·modes·exist:</p><ul><li>··If·the·user·doesn't·specify·an·option,·the·scanner·creates·an·ets·table,·and
188 uses·built-in·functions·to·read·and·write·data·to·it.·When·the·scanner·is188 uses·built-in·functions·to·read·and·write·data·to·it.·When·the·scanner·is
189 done,·the·ets·table·is·deleted.</li><li>··If·the·user·specifies·an·ets·table·via·the·<code·class="inline">{rules, Table}</code>·option,·the189 done,·the·ets·table·is·deleted.</li><li>··If·the·user·specifies·an·ets·table·via·the·<code·class="inline">{rules, Table}</code>·option,·the
190 scanner·uses·this·table.·When·the·scanner·is·done,·it·does·<em>not</em>·delete·the190 scanner·uses·this·table.·When·the·scanner·is·done,·it·does·<em>not</em>·delete·the
191 table.</li><li>··If·the·user·specifies·read·and·write·functions,·the·scanner·will·use·them191 table.</li><li>··If·the·user·specifies·read·and·write·functions,·the·scanner·will·use·them
192 instead.</li></ul><p>The·format·for·the·read·and·write·functions·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="n">WriteFun</span><span·class="p"·data-group-id="6111943157-1">(</span><span·class="n">Context</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Definition</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·76,·SHA:·f1bd37e61ff3cd1e38751f4af470a2785ef36813ddbdb44702c49202acebc63f·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">NewScannerState</span><span·class="p">.</span><span·class="w">192 instead.</li></ul><p>The·format·for·the·read·and·write·functions·are·as·follows:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">·</span><span·class="n">WriteFun</span><span·class="p"·data-group-id="9935268834-1">(</span><span·class="n">Context</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Definition</span><span·class="p">,</span><span·class="w">·</span>[·...·truncated·by·diffoscope;·len:·76,·SHA:·f944eacb4d6e15e8750232c1b81f950d76f363fef5ace1f6ca7d7a864c8ff85e·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">NewScannerState</span><span·class="p">.</span><span·class="w">
193 ·</span><span·class="n">ReadFun</span><span·class="p"·data-group-id="6111943157-2">(</span><span·class="n">Context</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ScannerState</span><span·class="p"·data-group-id="6111943157-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Definition</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">.</span></code></pre><p>Here·is·a·summary·of·the·data·objects·currently·being·written·by·the·scanner:</p><table><thead><tr><th·style="text-align:·left;">Context</th><th·style="text-align:·left;">Key·Value</th><th·style="text-align:·left;">Definition</th></tr></thead><tbody><tr><td·style="text-align:·left;">notation</td><td·style="text-align:·left;">NotationName</td><td·style="text-align:·left;"><code·class="inline">{system, SL}·|·{public, PIDL, SL}</code></td></tr><tr><td·style="text-align:·left;">elem_def</td><td·style="text-align:·left;">ElementName</td><td·style="text-align:·left;"><code·class="inline">#xmlElement{content·=·ContentSpec}</code></td></tr><tr><td·style="text-align:·left;">parameter_entity</td><td·style="text-align:·left;">PEName</td><td·style="text-align:·left;"><code·class="inline">PEDef</code></td></tr><tr><td·style="text-align:·left;">entity</td><td·style="text-align:·left;">EntityName</td><td·style="text-align:·left;"><code·class="inline">EntityDef</code></td></tr></tbody></table><p><strong>·Table·1:</strong>·Scanner·data·objects</p><p>where</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ContentSpec</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">empty</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">any</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">ElemContent</span><span·class="w">193 ·</span><span·class="n">ReadFun</span><span·class="p"·data-group-id="9935268834-2">(</span><span·class="n">Context</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Name</span><span·class="p">,</span><span·class="w">·</span><span·class="n">ScannerState</span><span·class="p"·data-group-id="9935268834-2">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Definition</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">undefined</span><span·class="p">.</span></code></pre><p>Here·is·a·summary·of·the·data·objects·currently·being·written·by·the·scanner:</p><table><thead><tr><th·style="text-align:·left;">Context</th><th·style="text-align:·left;">Key·Value</th><th·style="text-align:·left;">Definition</th></tr></thead><tbody><tr><td·style="text-align:·left;">notation</td><td·style="text-align:·left;">NotationName</td><td·style="text-align:·left;"><code·class="inline">{system, SL}·|·{public, PIDL, SL}</code></td></tr><tr><td·style="text-align:·left;">elem_def</td><td·style="text-align:·left;">ElementName</td><td·style="text-align:·left;"><code·class="inline">#xmlElement{content·=·ContentSpec}</code></td></tr><tr><td·style="text-align:·left;">parameter_entity</td><td·style="text-align:·left;">PEName</td><td·style="text-align:·left;"><code·class="inline">PEDef</code></td></tr><tr><td·style="text-align:·left;">entity</td><td·style="text-align:·left;">EntityName</td><td·style="text-align:·left;"><code·class="inline">EntityDef</code></td></tr></tbody></table><p><strong>·Table·1:</strong>·Scanner·data·objects</p><p>where</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">ContentSpec</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">empty</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">any</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">ElemContent</span><span·class="w">
194 </span><span·class="n">ElemContent</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="p"·data-group-id="2862113637-1">{</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Elems</span><span·class="p"·data-group-id="2862113637-1">}</span><span·class="w">194 </span><span·class="n">ElemContent</span><span·class="w">·</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="p"·data-group-id="2513657641-1">{</span><span·class="n">Mode</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Elems</span><span·class="p"·data-group-id="2513657641-1">}</span><span·class="w">
195 </span><span·class="n">Mode</span><span·class="w">········</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">seq</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">choice</span><span·class="w">195 </span><span·class="n">Mode</span><span·class="w">········</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">seq</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">choice</span><span·class="w">
196 </span><span·class="n">Elems</span><span·class="w">·······</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="p"·data-group-id="2862113637-2">[</span><span·class="n">Elem</span><span·class="p"·data-group-id="2862113637-2">]</span><span·class="w">196 </span><span·class="n">Elems</span><span·class="w">·······</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="p"·data-group-id="2513657641-2">[</span><span·class="n">Elem</span><span·class="p"·data-group-id="2513657641-2">]</span><span·class="w">
197 </span><span·class="n">Elem</span><span·class="w">········</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">&#39;#PCDATA&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Name</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">ElemContent</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="2862113637-3">{</span><span·class="n">Occurrence</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Elems</span><span·class="p"·data-group-id="2862113637-3">}</span><span·class="w">197 </span><span·class="n">Elem</span><span·class="w">········</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">&#39;#PCDATA&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">Name</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="n">ElemContent</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="p"·data-group-id="2513657641-3">{</span><span·class="n">Occurrence</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Elems</span><span·class="p"·data-group-id="2513657641-3">}</span><span·class="w">
198 </span><span·class="n">Occurrence</span><span·class="w">··</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">&#39;*&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;?&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;+&#39;</span></code></pre><p>NOTE:·<em>When·&lt;Elem&gt;·is·not·wrapped·with·&lt;Occurrence&gt;,·(Occurrence·=·once)·is198 </span><span·class="n">Occurrence</span><span·class="w">··</span><span·class="p">:</span><span·class="p">:=</span><span·class="w">·</span><span·class="ss">&#39;*&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;?&#39;</span><span·class="w">·</span><span·class="p">|</span><span·class="w">·</span><span·class="ss">&#39;+&#39;</span></code></pre><p>NOTE:·<em>When·&lt;Elem&gt;·is·not·wrapped·with·&lt;Occurrence&gt;,·(Occurrence·=·once)·is
199 implied.</em></p><h4>1.7·Accumulator·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="6545380369-1">{</span><span·class="ss">acc_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="6545380369-2">(</span><span·class="p"·data-group-id="6545380369-2">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·580e27d05ef11226b415b2241f1c5fa9f8dc58a75ec5b395c76676e11b95f638·...·]-1">}</span></code></pre><p>The·accumulator·function·is·called·to·accumulate·the·contents·of·an·entity.When199 implied.</em></p><h4>1.7·Accumulator·Function</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="p"·data-group-id="1204321410-1">{</span><span·class="ss">acc_fun</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="1204321410-2">(</span><span·class="p"·data-group-id="1204321410-2">)</span><span·class="p"·data-g[·...·truncated·by·diffoscope;·len:·19,·SHA:·0ad00042f845dd15bf61b82c57686bb0112809864b7776ce5e0cd79ae67f05de·...·]-1">}</span></code></pre><p>The·accumulator·function·is·called·to·accumulate·the·contents·of·an·entity.When
200 parsing·very·large·files,·it·may·not·be·desirable·to·do·so.In·this·case,·an·acc200 parsing·very·large·files,·it·may·not·be·desirable·to·do·so.In·this·case,·an·acc
201 function·can·be·provided·that·simply·doesn't·accumulate.</p><p>Note·that·it·is·possible·to·even·modify·the·parsed·entity·before·accumulating201 function·can·be·provided·that·simply·doesn't·accumulate.</p><p>Note·that·it·is·possible·to·even·modify·the·parsed·entity·before·accumulating
202 it,·but·this·must·be·done·with·care.·xmerl_scan·performs·post-processing·of·the202 it,·but·this·must·be·done·with·care.·xmerl_scan·performs·post-processing·of·the
203 element·for·namespace·management.·Thus,·the·element·must·keep·its·original203 element·for·namespace·management.·Thus,·the·element·must·keep·its·original
204 structure·for·this·to·work.</p><p>The·acc·function·has·the·following·format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·default·accumulating·acc·fun</span><span·class="w">204 structure·for·this·to·work.</p><p>The·acc·function·has·the·following·format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="c1">%%·default·accumulating·acc·fun</span><span·class="w">
205 </span><span·class="nf">fun</span><span·class="p"·data-group-id="2746026360-1">(</span><span·class="n">ParsedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="2746026360-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">205 </span><span·class="nf">fun</span><span·class="p"·data-group-id="4043891805-1">(</span><span·class="n">ParsedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="4043891805-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
206 ···</span><span·class="p"·data-group-id="2746026360-2">{</span><span·class="p"·data-group-id="2746026360-3">[</span><span·class="n">ParsedEntity</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="2746026360-3">]</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·80,·SHA:·73bf09802c1f1b07ac2c4250de8c813932ac1b94c150eb71641e2be8b6d4f74c·...·]-2">}</span><span·class="p">.</span><span·class="w">206 ···</span><span·class="p"·data-group-id="4043891805-2">{</span><span·class="p"·data-group-id="4043891805-3">[</span><span·class="n">ParsedEntity</span><span·class="p">|</span><span·class="n">Acc</span><span·class="p"·data-group-id="4043891805-3">]</span><span·class="p">,</span><span·class="w">·</[·...·truncated·by·diffoscope;·len:·80,·SHA:·27351cccbc599317686dd1d61797c57fd6fada4c8f89185bcd005dd74bf3556e·...·]-2">}</span><span·class="p">.</span><span·class="w">
  
207 </span><span·class="c1">%%·non-accumulating·acc·fun</span><span·class="w">207 </span><span·class="c1">%%·non-accumulating·acc·fun</span><span·class="w">
208 </span><span·class="nf">fun</span><span·class="p"·data-group-id="2746026360-4">(</span><span·class="n">ParsedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="2746026360-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">208 </span><span·class="nf">fun</span><span·class="p"·data-group-id="4043891805-4">(</span><span·class="n">ParsedEntity</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="4043891805-4">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
209 ···</span><span·class="p"·data-group-id="2746026360-5">{</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="2746026360-5">}</span><span·class="p">.</span></code></pre><h4>1.8·Close·Function</h4><p>The·close·function·is·called·when·a·document·(either·the·main·document·or·an209 ···</span><span·class="p"·data-group-id="4043891805-5">{</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="4043891805-5">}</span><span·class="p">.</span></code></pre><h4>1.8·Close·Function</h4><p>The·close·function·is·called·when·a·document·(either·the·main·document·or·an
210 external·DTD)·has·been·completely·parsed.·When·xmerl_scan·was·started·using210 external·DTD)·has·been·completely·parsed.·When·xmerl_scan·was·started·using
211 <code·class="inline">xmerl_scan:file/[1,2]</code>,·the·file·will·be·read·in·full,·and·closed·immediately,211 <code·class="inline">xmerl_scan:file/[1,2]</code>,·the·file·will·be·read·in·full,·and·closed·immediately,
212 before·the·parsing·starts,·so·when·the·close·function·is·called,·it·will·not212 before·the·parsing·starts,·so·when·the·close·function·is·called,·it·will·not
213 need·to·actually·close·the·file.·In·this·case,·the·close·function·will·be·a·good213 need·to·actually·close·the·file.·In·this·case,·the·close·function·will·be·a·good
214 place·to·modify·the·state·variables.</p><p>Format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="0873910406-1">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="0873910406-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">214 place·to·modify·the·state·variables.</p><p>Format·and·semantics:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">fun</span><span·class="p"·data-group-id="3745379795-1">(</span><span·class="n">GlobalState</span><span·class="p"·data-group-id="3745379795-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
215 ···</span><span·class="n">GlobalState1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%·state·variables·may·be·altered</span></code></pre><h3·id="2-examples"·class="section-heading">215 ···</span><span·class="n">GlobalState1</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">··</span><span·class="c1">%·state·variables·may·be·altered</span></code></pre><h3·id="2-examples"·class="section-heading">
216 ··<a·href="#2-examples"·class="hover-link">216 ··<a·href="#2-examples"·class="hover-link">
217 ····<i·class="ri-link-m"·aria-hidden="true"></i>217 ····<i·class="ri-link-m"·aria-hidden="true"></i>
218 ··</a>218 ··</a>
219 ··<span·class="text">2·Examples</span>219 ··<span·class="text">2·Examples</span>
220 </h3>220 </h3>
221 <p>See·<code·class="inline">xmerl_test.erl</code>·for·more·examples.</p><h4>2.1·Handling·spaces</h4><p>The·following·sample·program·illustrates·three·ways·of·scanning·a·document:</p><ol><li>·the·default·scan,·which·leaves·whitespace·untouched</li><li>·normalizing·spaces</li><li>·normalizing·spaces,·then·removing·text·elements·that·only·contain·one·space.</li></ol><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="8440309839-1">(</span><span·class="ss">tmp</span><span·class="p"·data-group-id="8440309839-1">)</span><span·class="p">.</span><span·class="w">221 <p>See·<code·class="inline">xmerl_test.erl</code>·for·more·examples.</p><h4>2.1·Handling·spaces</h4><p>The·following·sample·program·illustrates·three·ways·of·scanning·a·document:</p><ol><li>·the·default·scan,·which·leaves·whitespace·untouched</li><li>·normalizing·spaces</li><li>·normalizing·spaces,·then·removing·text·elements·that·only·contain·one·space.</li></ol><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">module</span><span·class="p"·data-group-id="4011469669-1">(</span><span·class="ss">tmp</span><span·class="p"·data-group-id="4011469669-1">)</span><span·class="p">.</span><span·class="w">
222 </span><span·class="w">222 </span><span·class="w">
223 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="8440309839-2">(</span><span·class="s">&quot;xmerl.hrl&quot;</span><span·class="p"·data-group-id="8440309839-2">)</span><span·class="p">.</span><span·class="w">223 </span><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="4011469669-2">(</span><span·class="s">&quot;xmerl.hrl&quot;</span><span·class="p"·data-group-id="4011469669-2">)</span><span·class="p">.</span><span·class="w">
224 </span><span·class="w">224 </span><span·class="w">
225 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="8440309839-3">(</span><span·class="p"·data-group-id="8440309839-4">[</span><span·class="ss">file1</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file2</span><span·class="p">/</span><s[·...·truncated·by·diffoscope;·len:·242,·SHA:·82e10ec07a8015a257f9d7c88b2c7a3c0914e8b1fdb38822a2edc5276dbfa30b·...·]9-3">)</span><span·class="p">.</span><span·class="w">225 </span><span·class="p">-</span><span·class="na">export</span><span·class="p"·data-group-id="4011469669-3">(</span><span·class="p"·data-group-id="4011469669-4">[</span><span·class="ss">file1</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">file2</span><span·class="p">/</span><s[·...·truncated·by·diffoscope;·len:·242,·SHA:·d2adbfc895773ed6378da68aac7546b382de60e5270c8514c7456a2afc397266·...·]9-3">)</span><span·class="p">.</span><span·class="w">
  
226 </span><span·class="nf">file1</span><span·class="p"·data-group-id="8440309839-5">(</span><span·class="n">F</span><span·class="p"·data-group-id="8440309839-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">file</[·...·truncated·by·diffoscope;·len:·122,·SHA:·c4a091ac9b323cdaadbdeb6e5675949dd2902ffc0007861114e8f9401accf00a·...·]9-6">)</span><span·class="p">.</span><span·class="w">226 </span><span·class="nf">file1</span><span·class="p"·data-group-id="4011469669-5">(</span><span·class="n">F</span><span·class="p"·data-group-id="4011469669-5">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">file</[·...·truncated·by·diffoscope;·len:·122,·SHA:·4b62f23b50e42ef98695d1a7530154f9092a91176d4dc9f89a27e7acaa79026a·...·]9-6">)</span><span·class="p">.</span><span·class="w">
  
227 </span><span·class="nf">file2</span><span·class="p"·data-group-id="8440309839-7">(</span><span·class="n">F</span><span·class="p"·data-group-id="8440309839-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">file</[·...·truncated·by·diffoscope;·len:·470,·SHA:·77201f1b98e9db91cde5b4fe85317aaa3b72fd1d30272dc4f6a4e3cd73b04b66·...·]9-8">)</span><span·class="p">.</span><span·class="w">227 </span><span·class="nf">file2</span><span·class="p"·data-group-id="4011469669-7">(</span><span·class="n">F</span><span·class="p"·data-group-id="4011469669-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">file</[·...·truncated·by·diffoscope;·len:·470,·SHA:·0230bbc8cea149eec32b7028e5e9d89164a2a473a355599853691c0ddd8faee0·...·]9-8">)</span><span·class="p">.</span><span·class="w">
  
228 </span><span·class="nf">file3</span><span·class="p"·data-group-id="8440309839-11">(</span><span·class="n">F</span><span·class="p"·data-group-id="8440309839-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span><span·class="o">=</span><span[·...·truncated·by·diffoscope;·len:·887,·SHA:·a4886912d7e9ab0142232bffd9844f5ad87634e378aab4a2ca6caf68ad752e4f·...·]9-14">{</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><span·class="p">,</span><span·class="w">228 </span><span·class="nf">file3</span><span·class="p"·data-group-id="4011469669-11">(</span><span·class="n">F</span><span·class="p"·data-group-id="4011469669-11">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">·</span><span·class="n">Acc</span><span·class="w">·</span><span·class="o">=</span><span[·...·truncated·by·diffoscope;·len:·887,·SHA:·c651f56de06a8b6de45d39a93234c117f7c28fa81322b364419ea7183be9e548·...·]9-14">{</span><span·class="n">Acc</span><span·class="p">,</span><span·class="w">·</span><span·class="n">P</span><span·class="p">,</span><span·class="w">
229 </span><span·class="n">S</span><span·class="p"·data-group-id="8440309839-14">}</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·new·return·format·(X,·Acc,·S)·-&gt;·{[X|Acc],·S}·end,·xmerl_scan:file(F,</span><span·class="w">229 </span><span·class="n">S</span><span·class="p"·data-group-id="4011469669-14">}</span><span·class="p">;</span><span·class="w">·</span><span·class="c1">%·new·return·format·(X,·Acc,·S)·-&gt;·{[X|Acc],·S}·end,·xmerl_scan:file(F,</span><span·class="w">
230 </span><span·class="p"·data-group-id="8440309839-15">[</span><span·class="p"·data-group-id="8440309839-16">{</span><span·class="ss">space</span><span·class="p">,</span><span·class="ss">normalize</span><span·class="p"·data-group-id="8440309839-16">}</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·262,·SHA:·93aab4a1dd997ab28d477cf799a81050e00c7bd4ac4cad7a1a15670899b2e5ba·...·]9-15">]</span><span·class="p">)</span><span·class="p">.</span></code></pre>230 </span><span·class="p"·data-group-id="4011469669-15">[</span><span·class="p"·data-group-id="4011469669-16">{</span><span·class="ss">space</span><span·class="p">,</span><span·class="ss">normalize</span><span·class="p"·data-group-id="4011469669-16">}</span><span·class="p">,</span><span·class="w"[·...·truncated·by·diffoscope;·len:·262,·SHA:·197512b30dd5c23ce7989848682c19fd0fddff19579b43cb54b429b45ea41488·...·]9-15">]</span><span·class="p">)</span><span·class="p">.</span></code></pre>
231 </div>231 </div>
  
232 <div·class="bottom-actions"·id="bottom-actions">232 <div·class="bottom-actions"·id="bottom-actions">
233 ··<div·class="bottom-actions-item">233 ··<div·class="bottom-actions-item">
  
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275 ········Built·using275 ········Built·using
276 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the276 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
277 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>277 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
278 ······</p>278 ······</p>
279 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>279 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
280 ····</footer>280 ····</footer>
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282 </main>282 </main>
283 </div>283 </div>
284 <script>284 <script>
285 ··function·mermaidLoaded()·{285 ··function·mermaidLoaded()·{
286 ····mermaid.initialize({286 ····mermaid.initialize({
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773 ······</p>773 ······</p>
774 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>774 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
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781 ····mermaid.initialize({781 ····mermaid.initialize({
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189 first·element·in·each·tuple·is·the·name·of·the·parent·element.·The·list·is·in189 first·element·in·each·tuple·is·the·name·of·the·parent·element.·The·list·is·in
190 reverse·order.</p><p>The·record·<code·class="inline">#xmlAttribute{}</code>·holds·the·name·and·value·of·an·attribute190 reverse·order.</p><p>The·record·<code·class="inline">#xmlAttribute{}</code>·holds·the·name·and·value·of·an·attribute
191 in·the·fields·<code·class="inline">name</code>·and·<code·class="inline">value</code>.·All·attributes·of·an·element·is·a·list·of191 in·the·fields·<code·class="inline">name</code>·and·<code·class="inline">value</code>.·All·attributes·of·an·element·is·a·list·of
192 <code·class="inline">#xmlAttribute{}</code>·in·the·field·<code·class="inline">attributes</code>·of·the·<code·class="inline">#xmlElement{}</code>·record.</p><p>The·<code·class="inline">content</code>·field·of·the·top·element·is·a·list·of·records·that·shows·the192 <code·class="inline">#xmlAttribute{}</code>·in·the·field·<code·class="inline">attributes</code>·of·the·<code·class="inline">#xmlElement{}</code>·record.</p><p>The·<code·class="inline">content</code>·field·of·the·top·element·is·a·list·of·records·that·shows·the
193 structure·and·data·of·the·document.·If·it·is·a·simple·document·like:</p><pre><code·class="text">&lt;?xml·version=&quot;1.0&quot;?&gt;193 structure·and·data·of·the·document.·If·it·is·a·simple·document·like:</p><pre><code·class="text">&lt;?xml·version=&quot;1.0&quot;?&gt;
194 &lt;dog&gt;194 &lt;dog&gt;
195 Grand·Danois195 Grand·Danois
196 &lt;/dog&gt;</code></pre><p>The·parse·result·will·be:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="7459667123-1">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">dog</span><span·class="p">,</span><span·class="w">196 &lt;/dog&gt;</code></pre><p>The·parse·result·will·be:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4563082762-1">{</span><span·class="ss">name</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="ss">dog</span><span·class="p">,</span><span·class="w">
197 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">197 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
198 ············</span><span·class="ss">parents</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7459667123-2">[</span><span·class="p"·data-group-id="7459667123-2">]</span><span·class="p">,</span><span·class="w">198 ············</span><span·class="ss">parents</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4563082762-2">[</span><span·class="p"·data-group-id="4563082762-2">]</span><span·class="p">,</span><span·class="w">
199 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">199 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
200 ············</span><span·class="ss">attributes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7459667123-3">[</span><span·class="p"·data-group-id="7459667123-3">]</span><span·class="p">,</span><span·class="w">200 ············</span><span·class="ss">attributes</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4563082762-3">[</span><span·class="p"·data-group-id="4563082762-3">]</span><span·class="p">,</span><span·class="w">
201 ············</span><span·class="ss">content</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="7459667123-4">[</span><span·class="p"·data-group-id="7459667123-5">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="7459667123-6">[</span><span·class="p"·data-group-id="7459667123-7">{</span><span·class="ss">dog[·...·truncated·by·diffoscope;·len:·329,·SHA:·eaf1c6120a876a7fe210b7b25a0085863ddcf39d5b2fcd636a63b8ede1e50b6e·...·]-8">]</span><span·class="p">,</span><span·class="s">&quot;\201 ············</span><span·class="ss">content</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="p"·data-group-id="4563082762-4">[</span><span·class="p"·data-group-id="4563082762-5">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="4563082762-6">[</span><span·class="p"·data-group-id="4563082762-7">{</span><span·class="ss">dog[·...·truncated·by·diffoscope;·len:·329,·SHA:·249f2babefb93dae3f8277dec08e35408e46bf2747b812f62ecbc66837147139·...·]-8">]</span><span·class="p">,</span><span·class="s">&quot;\
202 Grand·Danois\202 Grand·Danois\
203 &quot;</span><span·class="p">,</span><span·class="ss">text</span><span·class="p"·data-group-id="7459667123-5">}</span><span·class="p"·data-group-id="7459667123-4">]</span><span·class="p">,</span><span·class="w">203 &quot;</span><span·class="p">,</span><span·class="ss">text</span><span·class="p"·data-group-id="4563082762-5">}</span><span·class="p"·data-group-id="4563082762-4">]</span><span·class="p">,</span><span·class="w">
204 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">204 ············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
205 ············</span><span·class="p"·data-group-id="7459667123-1">}</span></code></pre><p>Where·the·content·of·the·top·element·is:205 ············</span><span·class="p"·data-group-id="4563082762-1">}</span></code></pre><p>Where·the·content·of·the·top·element·is:
206 <code·class="inline">[{xmlText,[{dog,1}],1,[],&quot;\·Grand·Danois\·&quot;,text}]</code>.·Text·will·be·returned·in206 <code·class="inline">[{xmlText,[{dog,1}],1,[],&quot;\·Grand·Danois\·&quot;,text}]</code>.·Text·will·be·returned·in
207 <code·class="inline">xmlText</code>·records.·Though,·usually·documents·are·more·complex,·and·the·content207 <code·class="inline">xmlText</code>·records.·Though,·usually·documents·are·more·complex,·and·the·content
208 of·the·top·element·will·in·that·case·be·a·nested·structure·with·<code·class="inline">#xmlElement{}</code>208 of·the·top·element·will·in·that·case·be·a·nested·structure·with·<code·class="inline">#xmlElement{}</code>
209 records·that·in·turn·may·have·complex·content.·All·of·this·reflects·the209 records·that·in·turn·may·have·complex·content.·All·of·this·reflects·the
210 structure·of·the·XML·document.</p><p>Space·characters·between·mark-up·as·<code·class="inline">space</code>,·<code·class="inline">tab</code>·and·<code·class="inline">line·feed</code>·are210 structure·of·the·XML·document.</p><p>Space·characters·between·mark-up·as·<code·class="inline">space</code>,·<code·class="inline">tab</code>·and·<code·class="inline">line·feed</code>·are
211 normalized·and·returned·as·xmlText·records.</p><h3·id="errors"·class="section-heading">211 normalized·and·returned·as·xmlText·records.</p><h3·id="errors"·class="section-heading">
212 ··<a·href="#errors"·class="hover-link">212 ··<a·href="#errors"·class="hover-link">
Offset 267, 49 lines modifiedOffset 267, 49 lines modified
  
267 &lt;!--·Date·of·the·format·yyyy.mm.dd·--&gt;267 &lt;!--·Date·of·the·format·yyyy.mm.dd·--&gt;
268 &lt;!ELEMENT·date··············(#PCDATA)&gt;268 &lt;!ELEMENT·date··············(#PCDATA)&gt;
269 &lt;!ATTLIST··bike·year·NMTOKEN·#REQUIRED269 &lt;!ATTLIST··bike·year·NMTOKEN·#REQUIRED
270 ················color·NMTOKENS·#REQUIRED270 ················color·NMTOKENS·#REQUIRED
271 ················condition·(useless·|·bad·|·serviceable·|·moderate·|·good·|271 ················condition·(useless·|·bad·|·serviceable·|·moderate·|·good·|
272 ···························excellent·|·new·|·outstanding)·&quot;excellent&quot;·&gt;</code></pre><p>If·you·want·to·parse·the·XML·file·motorcycles.xml·you·run·it·in·the·Erlang·shell272 ···························excellent·|·new·|·outstanding)·&quot;excellent&quot;·&gt;</code></pre><p>If·you·want·to·parse·the·XML·file·motorcycles.xml·you·run·it·in·the·Erlang·shell
273 like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="p"·data-group-id="1129460460-1">{</span><span·class="n">ParseResult</span><span·class="p">,</span><span·class="n">Misc</span><span·class="p"·data-group-id="1129460460-1">}</span><span·class="o">=</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="n[·...·truncated·by·diffoscope;·len:·158,·SHA:·80ca02fa6ebbfbc685b4b77755e8a5aacd40e6b4a3892d4ca6563d7884917f68·...·]-2">)</span><span·class="p">.</span><span·class="w">273 like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="gp·unselectable">3&gt;·</span><span·class="p"·data-group-id="9812854122-1">{</span><span·class="n">ParseResult</span><span·class="p">,</span><span·class="n">Misc</span><span·class="p"·data-group-id="9812854122-1">}</span><span·class="o">=</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="n[·...·truncated·by·diffoscope;·len:·158,·SHA:·66f4408f82529a594247b01775ba24867deadf397774336b70715120a72a0145·...·]-2">)</span><span·class="p">.</span><span·class="w">
274 </span><span·class="p"·data-group-id="1129460460-3">{</span><span·class="p"·data-group-id="1129460460-4">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">motorcycles</span><span·class="p">,</span><span·class="w">274 </span><span·class="p"·data-group-id="9812854122-3">{</span><span·class="p"·data-group-id="9812854122-4">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">motorcycles</span><span·class="p">,</span><span·class="w">
275 ·············</span><span·class="ss">motorcycles</span><span·class="p">,</span><span·class="w">275 ·············</span><span·class="ss">motorcycles</span><span·class="p">,</span><span·class="w">
276 ·············</span><span·class="p"·data-group-id="1129460460-5">[</span><span·class="p"·data-group-id="1129460460-5">]</span><span·class="p">,</span><span·class="w">276 ·············</span><span·class="p"·data-group-id="9812854122-5">[</span><span·class="p"·data-group-id="9812854122-5">]</span><span·class="p">,</span><span·class="w">
277 ·············</span><span·class="p"·data-group-id="1129460460-6">{</span><span·class="ss">xmlNamespace</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-7">[</span><span·class="p"·data-group-id="1129460460-7">]</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-8"[·...·truncated·by·diffoscope;·len:·103,·SHA:·10de8e90f4e3889cbc46d619d4e0bd535baf222dec0822cdb57ed27fdd916175·...·]-6">}</span><span·class="p">,</span><span·class="w">277 ·············</span><span·class="p"·data-group-id="9812854122-6">{</span><span·class="ss">xmlNamespace</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-7">[</span><span·class="p"·data-group-id="9812854122-7">]</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-8"[·...·truncated·by·diffoscope;·len:·103,·SHA:·352f72a8131f1d038f1fbd7a56726b65b14ffe3b263d43f63cb61f049d70175e·...·]-6">}</span><span·class="p">,</span><span·class="w">
278 ·············</span><span·class="p"·data-group-id="1129460460-9">[</span><span·class="p"·data-group-id="1129460460-9">]</span><span·class="p">,</span><span·class="w">278 ·············</span><span·class="p"·data-group-id="9812854122-9">[</span><span·class="p"·data-group-id="9812854122-9">]</span><span·class="p">,</span><span·class="w">
279 ·············</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">279 ·············</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
280 ·············</span><span·class="p"·data-group-id="1129460460-10">[</span><span·class="p"·data-group-id="1129460460-10">]</span><span·class="p">,</span><span·class="w">280 ·············</span><span·class="p"·data-group-id="9812854122-10">[</span><span·class="p"·data-group-id="9812854122-10">]</span><span·class="p">,</span><span·class="w">
281 ·············</span><span·class="p"·data-group-id="1129460460-11">[</span><span·class="p"·data-group-id="1129460460-12">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-13">[</span><span·class="p"·data-group-id="1129460460-14">{</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·344,·SHA:·e5850b68e4135fb0aec918e4c862a312003dc2e94db74a9c8ffdaa92eba541e1·...·]-15">]</span><span·class="p">,</span><span·class="s">&quot;\281 ·············</span><span·class="p"·data-group-id="9812854122-11">[</span><span·class="p"·data-group-id="9812854122-12">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-13">[</span><span·class="p"·data-group-id="9812854122-14">{</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·344,·SHA:·0801f83979a198d15e78f7698f08da22a8162009d9eca2b18f57cdc05f3e1f79·...·]-15">]</span><span·class="p">,</span><span·class="s">&quot;\
282 ··&quot;</span><span·class="p">,</span><span·class="ss">text</span><span·class="p"·data-group-id="1129460460-12">}</span><span·class="p">,</span><span·class="w">282 ··&quot;</span><span·class="p">,</span><span·class="ss">text</span><span·class="p"·data-group-id="9812854122-12">}</span><span·class="p">,</span><span·class="w">
283 ··············</span><span·class="p"·data-group-id="1129460460-16">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">bike</span><span·class="p">,</span><span·class="w">283 ··············</span><span·class="p"·data-group-id="9812854122-16">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">bike</span><span·class="p">,</span><span·class="w">
284 ··························</span><span·class="ss">bike</span><span·class="p">,</span><span·class="w">284 ··························</span><span·class="ss">bike</span><span·class="p">,</span><span·class="w">
285 ··························</span><span·class="p"·data-group-id="1129460460-17">[</span><span·class="p"·data-group-id="1129460460-17">]</span><span·class="p">,</span><span·class="w">285 ··························</span><span·class="p"·data-group-id="9812854122-17">[</span><span·class="p"·data-group-id="9812854122-17">]</span><span·class="p">,</span><span·class="w">
286 ··························</span><span·class="p"·data-group-id="1129460460-18">{</span><span·class="ss">xmlNamespace</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-19">[</span><span·class="p"·data-group-id="1129460460-19">]</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-20">[</span><span·class="p"·data-group-id="1129460460-20">]</span><span·class="p"·data-group-id="1129460460-18">}</span><span·class="p">,</span><span·class="w"> 
287 ··························</span><span·class="p"·data-group-id="1129460460-21">[</span><span·class="p"·data-group-id="1129460460-22">{</span><span·class="ss">motorcycles</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="1129460460-22">}</span><span·class="p"·data-group-id="1129460460[·...·truncated·by·diffoscope;·len:·6,·SHA:·c42b35cf2cca49aca1ee316dcc19bbdf8814a54362bad303a23d01383e3174bb·...·]</span><span·class="p">,</span><span·class="w">286 ··························</span><span·class="p"·data-group-id="9812854122-18">{</span><span·class="ss">xmlNamespace</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-19">[</span><span·class="p"·data-group-id="9812854122-19">]</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122[·...·truncated·by·diffoscope;·len:·114,·SHA:·dbc5e8ace3535bdee84006fafcdb928a570cee6dea9f0dc21e686dc63b2138ec·...·]</span><span·class="p">,</span><span·class="w">
 287 ··························</span><span·class="p"·data-group-id="9812854122-21">[</span><span·class="p"·data-group-id="9812854122-22">{</span><span·class="ss">motorcycles</span><span·class="p">,</span><span·class="mi">1</span><span·class="p"·data-group-id="9812854122-22">}</span><span·class="p"·data-group-id="9812854122-21">]</span><span·class="p">,</span><span·class="w">
288 ··························</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">288 ··························</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">
289 ··························</span><span·class="p"·data-group-id="1129460460-23">[</span><span·class="p"·data-group-id="1129460460-24">{</span><span·class="ss">xmlAttribute</span><span·class="p">,</span><span·class="ss">year</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-25">[</span><span·class="p"·data-group-id="1129460460-25">]</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-26">[</span><span·class="p"·data-group-id="1129460460-26">]</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-27">[</span><span·class="p"·data-group-id="1129460460-27">]</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-28">[</span><span·class="p"·data-group-id="1129460460-28">]</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="1129460460-24">}</span><span·class="p">,</span><span·class="w"> 
290 ···························</span><span·class="p"·data-group-id="1129460460-29">{</span><span·class="ss">xmlAttribute</span><span·class="p">,</span><span·class="ss">color</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-30">[</span><span·class="p"·data-group-[·...·truncated·by·diffoscope;·len:·488,·SHA:·21b8e238c69f91677ce3efea0ad8da57d51d56ed8dd26f7a85c40833df759f5b·...·]</span><span·class="p">,</span><span·class="w">289 ··························</span><span·class="p"·data-group-id="9812854122-23">[</span><span·class="p"·data-group-id="9812854122-24">{</span><span·class="ss">xmlAttribute</span><span·class="p">,</span><span·class="ss">year</span><span·class="p">,</span><span·class="p"·data-group-id[·...·truncated·by·diffoscope;·len:·618,·SHA:·d1a0e077b72a6fb9bf0bcecbb5fa4c5a8502bfd8399f3b66c9b795d905716e05·...·]</span><span·class="p">,</span><span·class="w">
 290 ···························</span><span·class="p"·data-group-id="9812854122-29">{</span><span·class="ss">xmlAttribute</span><span·class="p">,</span><span·class="ss">color</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-30">[</span><span·class="p"·data-group-id="9812854122-30">]</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-31">[</span><span·class="p"·data-group-id="9812854122-31">]</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-32">[</span><span·class="p"·data-group-id="9812854122-32">]</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9812854122-29">}</span><span·class="p"·data-group-id="9812854122-23">]</span><span·class="p">,</span><span·class="w">
291 ··························</span><span·class="p"·data-group-id="1129460460-33">[</span><span·class="p"·data-group-id="1129460460-34">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-35">[</span><span·class="p"·data-group-id="1129460460-36">{</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·419,·SHA:·dd7458be46474463ed8ffbe1b57491af51e85b833122f99e45300e117186a2fe·...·]-35">]</span><span·class="p">,</span><span·class="w">291 ··························</span><span·class="p"·data-group-id="9812854122-33">[</span><span·class="p"·data-group-id="9812854122-34">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-35">[</span><span·class="p"·data-group-id="9812854122-36">{</span><span·class="ss"[·...·truncated·by·diffoscope;·len:·419,·SHA:·0b8ba30de091c0ffa27bbc06035f58beecb815acd3615b4d53c9abf294dcdb83·...·]-35">]</span><span·class="p">,</span><span·class="w">
292 ····································</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">292 ····································</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">
293 ····································</span><span·class="p"·data-group-id="1129460460-38">[</span><span·class="p"·data-group-id="1129460460-38">]</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="1129460460-34">}</span><span·class="p">,</span><span·class="w">293 ····································</span><span·class="p"·data-group-id="9812854122-38">[</span><span·class="p"·data-group-id="9812854122-38">]</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9812854122-34">}</span><span·class="p">,</span><span·class="w">
294 ···························</span><span·class="p"·data-group-id="1129460460-39">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">name</span><span·class="p">,</span><span·class="ss">name</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-40">[</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·174,·SHA:·db13183393471a4d7308701ef06fc3567928fbaba3016ba9593ba85fe46e69b2·...·]-39">}</span><span·class="p">,</span><span·class="w">294 ···························</span><span·class="p"·data-group-id="9812854122-39">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">name</span><span·class="p">,</span><span·class="ss">name</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-40">[</span><span·class="p"·d[·...·truncated·by·diffoscope;·len:·174,·SHA:·0779764250f5d47d6ccc5d57e50ea8dce323710d14a211e1fc1356d184add60a·...·]-39">}</span><span·class="p">,</span><span·class="w">
295 ···························</span><span·class="p"·data-group-id="1129460460-41">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="1129460460-42">[</span><span·class="p"·data-group-id="1129460460-43">{</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</spa[·...·truncated·by·diffoscope;·len:·392,·SHA:·0e4fa486723a900052486b1c44e63ef874891bbd2b9e7c79c9186b575cbb052d·...·]-41">}</span><span·class="p">,</span><span·class="w">295 ···························</span><span·class="p"·data-group-id="9812854122-41">{</span><span·class="ss">xmlText</span><span·class="p">,</span><span·class="p"·data-group-id="9812854122-42">[</span><span·class="p"·data-group-id="9812854122-43">{</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</spa[·...·truncated·by·diffoscope;·len:·392,·SHA:·43fc504e970b1077c26568aa803d30ee57b5a22b43e7e74f8b94c5f3c0b8a0a8·...·]-41">}</span><span·class="p">,</span><span·class="w">
296 ···························</span><span·class="p"·data-group-id="1129460460-44">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">engine</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="1129460460-44">}</span><span·class="p">,</span><span·class="w">296 ···························</span><span·class="p"·data-group-id="9812854122-44">{</span><span·class="ss">xmlElement</span><span·class="p">,</span><span·class="ss">engine</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9812854122-44">}</span><span·class="p">,</span><span·class="w">
297 ···························</span><span·class="p"·data-group-id="1129460460-45">{</span><span·class="ss">xmlText</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="1129460460-45">}</span><span·class="p">,</span><span·class="w">297 ···························</span><span·class="p"·data-group-id="9812854122-45">{</span><span·class="ss">xmlText</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9812854122-45">}</span><span·class="p">,</span><span·class="w">
298 ···························</span><span·class="p"·data-group-id="1129460460-46">{</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="1129460460-46">}</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·812a78d117a1c63cfcc2694117a10095ac00525df6286a1f289890a30d727e31·...·]-33">]</span><span·class="p">,</span><span·class="w">298 ···························</span><span·class="p"·data-group-id="9812854122-46">{</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="p"·data-group-id="9812854122-46">}</span><span·class="p">|</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class[·...·truncated·by·diffoscope;·len:·30,·SHA:·2746c47449b5ab370b833d93109ff5f103c4433dd9c36882cbb87d1d00b984fd·...·]-33">]</span><span·class="p">,</span><span·class="w">
299 ··························</span><span·class="p"·data-group-id="1129460460-47">[</span><span·class="p"·data-group-id="1129460460-47">]</span><span·class="p">,</span><span·class="w">299 ··························</span><span·class="p"·data-group-id="9812854122-47">[</span><span·class="p"·data-group-id="9812854122-47">]</span><span·class="p">,</span><span·class="w">
300 ··························</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">300 ··························</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">
301 ··························</span><span·class="ss">undeclared</span><span·class="p"·data-group-id="1129460460-16">}</span><span·class="p">,</span><span·class="w">301 ··························</span><span·class="ss">undeclared</span><span·class="p"·data-group-id="9812854122-16">}</span><span·class="p">,</span><span·class="w">
302 ··············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">302 ··············</span><span·class="p">.</span><span·class="p">.</span><span·class="p">.</span><span·class="w">
303 ··············</span><span·class="p"·data-group-id="1129460460-11">]</span><span·class="p">,</span><span·class="w">303 ··············</span><span·class="p"·data-group-id="9812854122-11">]</span><span·class="p">,</span><span·class="w">
304 ·············</span><span·class="p"·data-group-id="1129460460-48">[</span><span·class="p"·data-group-id="1129460460-48">]</span><span·class="p">,</span><span·class="w">304 ·············</span><span·class="p"·data-group-id="9812854122-48">[</span><span·class="p"·data-group-id="9812854122-48">]</span><span·class="p">,</span><span·class="w">
305 ·············</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">305 ·············</span><span·class="s">&quot;.&quot;</span><span·class="p">,</span><span·class="w">
306 ·············</span><span·class="ss">undeclared</span><span·class="p"·data-group-id="1129460460-4">}</span><span·class="p">,</span><span·class="w">306 ·············</span><span·class="ss">undeclared</span><span·class="p"·data-group-id="9812854122-4">}</span><span·class="p">,</span><span·class="w">
307 ·</span><span·class="p"·data-group-id="1129460460-49">[</span><span·class="p"·data-group-id="1129460460-49">]</span><span·class="p"·data-group-id="1129460460-3">}</span><span·class="w">307 ·</span><span·class="p"·data-group-id="9812854122-49">[</span><span·class="p"·data-group-id="9812854122-49">]</span><span·class="p"·data-group-id="9812854122-3">}</span><span·class="w">
308 </span><span·class="mi">4</span><span·class="o">&gt;</span></code></pre><p>If·you·instead·receives·the·XML·doc·as·a·string·you·can·parse·it·by308 </span><span·class="mi">4</span><span·class="o">&gt;</span></code></pre><p>If·you·instead·receives·the·XML·doc·as·a·string·you·can·parse·it·by
309 <a·href="xmerl_scan.html#string/1"><code·class="inline">xmerl_scan:string/1</code></a>.·Both·file/2·and·string/2·exists·where·the·second·argument309 <a·href="xmerl_scan.html#string/1"><code·class="inline">xmerl_scan:string/1</code></a>.·Both·file/2·and·string/2·exists·where·the·second·argument
310 is·a·list·of·options·to·the·parser,·see·the·<a·href="xmerl_scan.html">reference·manual</a>.</p><h2·id="example-extracting-data-from-xml-content"·class="section-heading">310 is·a·list·of·options·to·the·parser,·see·the·<a·href="xmerl_scan.html">reference·manual</a>.</p><h2·id="example-extracting-data-from-xml-content"·class="section-heading">
311 ··<a·href="#example-extracting-data-from-xml-content"·class="hover-link">311 ··<a·href="#example-extracting-data-from-xml-content"·class="hover-link">
312 ····<i·class="ri-link-m"·aria-hidden="true"></i>312 ····<i·class="ri-link-m"·aria-hidden="true"></i>
313 ··</a>313 ··</a>
314 ··<span·class="text">Example:·Extracting·Data·From·XML·Content</span>314 ··<span·class="text">Example:·Extracting·Data·From·XML·Content</span>
Offset 338, 30 lines modifiedOffset 338, 30 lines modified
338 fields·of·the·appropriate·element.</p><p>There·is·support·for·this·in·Xmerl·by·the·&quot;simple-form&quot;·format.·You·can·put·your338 fields·of·the·appropriate·element.</p><p>There·is·support·for·this·in·Xmerl·by·the·&quot;simple-form&quot;·format.·You·can·put·your
339 data·in·a·simple-form·data·structure·and·feed·it·into339 data·in·a·simple-form·data·structure·and·feed·it·into
340 <code·class="inline">xmerl:export_simple(Content,Callback,RootAttributes)</code>.·Content·may·be·a·mixture340 <code·class="inline">xmerl:export_simple(Content,Callback,RootAttributes)</code>.·Content·may·be·a·mixture
341 of·simple-form·and·Xmerl·records·as·<code·class="inline">#xmlElement{}</code>·and·<code·class="inline">#xmlText{}</code>.</p><p>The·Types·are:</p><ul><li>Content·=·[Element]</li><li>Callback·=·atom()</li><li>RootAttributes·=·[Attributes]</li></ul><p>Element·is·any·of:</p><ul><li>{Tag,·Attributes,·Content}</li><li>{Tag,·Content}</li><li>Tag</li><li>IOString</li><li>#xmlText{}</li><li>#xmlElement{}</li><li>#xmlPI{}</li><li>#xmlComment{}</li><li>#xmlDecl{}</li></ul><p>The·simple-form·structure·is·any·of·<code·class="inline">{Tag,·Attributes,·Content}</code>,341 of·simple-form·and·Xmerl·records·as·<code·class="inline">#xmlElement{}</code>·and·<code·class="inline">#xmlText{}</code>.</p><p>The·Types·are:</p><ul><li>Content·=·[Element]</li><li>Callback·=·atom()</li><li>RootAttributes·=·[Attributes]</li></ul><p>Element·is·any·of:</p><ul><li>{Tag,·Attributes,·Content}</li><li>{Tag,·Content}</li><li>Tag</li><li>IOString</li><li>#xmlText{}</li><li>#xmlElement{}</li><li>#xmlPI{}</li><li>#xmlComment{}</li><li>#xmlDecl{}</li></ul><p>The·simple-form·structure·is·any·of·<code·class="inline">{Tag,·Attributes,·Content}</code>,
342 <code·class="inline">{Tag,·Content}</code>·or·<code·class="inline">Tag</code>·where:</p><ul><li>Tag·=·atom()</li><li>Attributes·=·[{Name,·Value}|·#xmlAttribute{}]</li><li>Name·=·atom()</li><li><p>Value·=·IOString·|·atom()·|·integer()</p></li></ul><p>See·also·reference·manual·for·<a·href="xmerl.html#export_simple/3">xmerl</a></p><p>If·you·want·to·add·the·information·about·a·black·Harley·Davidsson·1200·cc342 <code·class="inline">{Tag,·Content}</code>·or·<code·class="inline">Tag</code>·where:</p><ul><li>Tag·=·atom()</li><li>Attributes·=·[{Name,·Value}|·#xmlAttribute{}]</li><li>Name·=·atom()</li><li><p>Value·=·IOString·|·atom()·|·integer()</p></li></ul><p>See·also·reference·manual·for·<a·href="xmerl.html#export_simple/3">xmerl</a></p><p>If·you·want·to·add·the·information·about·a·black·Harley·Davidsson·1200·cc
343 Sportster·motorcycle·from·2003·that·is·in·shape·as·new·in·the·motorcycles.xml343 Sportster·motorcycle·from·2003·that·is·in·shape·as·new·in·the·motorcycles.xml
344 document·you·can·put·the·data·in·a·simple-form·data·structure·like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">344 document·you·can·put·the·data·in·a·simple-form·data·structure·like:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
345 ··</span><span·class="p"·data-group-id="5929885951-1">{</span><span·class="ss">bike</span><span·class="p">,</span><span·class="w">345 ··</span><span·class="p"·data-group-id="4282610634-1">{</span><span·class="ss">bike</span><span·class="p">,</span><span·class="w">
346 ·····</span><span·class="p"·data-group-id="5929885951-2">[</span><span·class="p"·data-group-id="5929885951-3">{</span><span·class="ss">year</span><span·class="p">,</span><span·class="s">&quot;2003&quot;</span><span·class="p"·data-group-id="5929885951-3">}</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·452,·SHA:·1057753d43d4ea94c7856fa8530c4599d5e7dbe29e0cddc52ea00462f1cf3386·...·]-2">]</span><span·class="p">,</span><span·class="w">346 ·····</span><span·class="p"·data-group-id="4282610634-2">[</span><span·class="p"·data-group-id="4282610634-3">{</span><span·class="ss">year</span><span·class="p">,</span><span·class="s">&quot;2003&quot;</span><span·class="p"·data-group-id="4282610634-3">}</span><span·class="p">,</span><span·class="[·...·truncated·by·diffoscope;·len:·452,·SHA:·b518f4945313bfaaf18a0a8ef85e1fa2325e81e88a50038bba1772cf2c8287ce·...·]-2">]</span><span·class="p">,</span><span·class="w">
347 ·····</span><span·class="p"·data-group-id="5929885951-6">[</span><span·class="p"·data-group-id="5929885951-7">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">347 ·····</span><span·class="p"·data-group-id="4282610634-6">[</span><span·class="p"·data-group-id="4282610634-7">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="w">
348 ·········</span><span·class="p"·data-group-id="5929885951-8">[</span><span·class="p"·data-group-id="5929885951-9">{</span><span·class="ss">manufacturer</span><span·class="p">,</span><span·class="p"·data-group-id="5929885951-10">[</span><span·class="s">&quot;Harley·Davidsson&quot;</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·79,·SHA:·9164cf83e069ac9c917231d59d9348ee1d6c6e914b8438aeaf3cfab8e5c7fc13·...·]-9">}</span><span·class="p">,</span><span·class="w">348 ·········</span><span·class="p"·data-group-id="4282610634-8">[</span><span·class="p"·data-group-id="4282610634-9">{</span><span·class="ss">manufacturer</span><span·class="p">,</span><span·class="p"·data-group-id="4282610634-10">[</span><span·class="s">&quot;Harley·Davidsson&quot;</span><span·class="p"·[·...·truncated·by·diffoscope;·len:·79,·SHA:·0f99ad2f9c13dbaffbbd5665b0d8e3021d967966988f732e377adf89d0600c3f·...·]-9">}</span><span·class="p">,</span><span·class="w">
349 ··········</span><span·class="p"·data-group-id="5929885951-11">{</span><span·class="ss">brandName</span><span·class="p">,</span><span·class="p"·data-group-id="5929885951-12">[</span><span·class="s">&quot;XL1200C&quot;</span><span·class="p"·data-group-id="5929885951-12">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·cfac9db9a4c0f9b05b74ee4b7e738b3f1bfbb8474c8f1065b66066792c3992da·...·]-11">}</span><span·class="p">,</span><span·class="w">349 ··········</span><span·class="p"·data-group-id="4282610634-11">{</span><span·class="ss">brandName</span><span·class="p">,</span><span·class="p"·data-group-id="4282610634-12">[</span><span·class="s">&quot;XL1200C&quot;</span><span·class="p"·data-group-id="4282610634-12">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·1b3bb6d0990733cf5aa86aee083a6a7a42a239d878fc922fa511bd0a19250b47·...·]-11">}</span><span·class="p">,</span><span·class="w">
350 ··········</span><span·class="p"·data-group-id="5929885951-13">{</span><span·class="ss">additionalName</span><span·class="p">,</span><span·class="p"·data-group-id="5929885951-14">[</span><span·class="s">&quot;Sportster&quot;</span><span·class="p"·data-group-id="5929885951-14">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·129,·SHA:·45ffc94e60237b1eff29312ccf5d0fe58a44645aacce80d26a8b175c9f1f8ce8·...·]-7">}</span><span·class="p">,</span><span·class="w">350 ··········</span><span·class="p"·data-group-id="4282610634-13">{</span><span·class="ss">additionalName</span><span·class="p">,</span><span·class="p"·data-group-id="4282610634-14">[</span><span·class="s">&quot;Sportster&quot;</span><span·class="p"·data-group-id="4282610634-14">]</span><span·class="p"·dat[·...·truncated·by·diffoscope;·len:·129,·SHA:·c580f97aeb0ddfd094ffefaabd62c90b978c1b83407112ae123f7e22c3f9dea4·...·]-7">}</span><span·class="p">,</span><span·class="w">
351 ······</span><span·class="p"·data-group-id="5929885951-15">{</span><span·class="ss">engine</span><span·class="p">,</span><span·class="w">351 ······</span><span·class="p"·data-group-id="4282610634-15">{</span><span·class="ss">engine</span><span·class="p">,</span><span·class="w">
352 ·········</span><span·class="p"·data-group-id="5929885951-16">[</span><span·class="s">&quot;V-engine,·2-cylinders,·1200·cc&quot;</span><span·class="p"·data-group-id="5929885951-16">]</span><span·class="p"·data-group-id="5929885951-15">}</span><span·class="p">,</span><span·class="w">352 ·········</span><span·class="p"·data-group-id="4282610634-16">[</span><span·class="s">&quot;V-engine,·2-cylinders,·1200·cc&quot;</span><span·class="p"·data-group-id="4282610634-16">]</span><span·class="p"·data-group-id="4282610634-15">}</span><span·class="p">,</span><span·class="w">
353 ······</span><span·class="p"·data-group-id="5929885951-17">{</span><span·class="ss">kind</span><span·class="p">,</span><span·class="p"·data-group-id="5929885951-18">[</span><span·class="s">&quot;custom&quot;</span><span·class="p"·data-group-id="5929885951-18">]</span><span·class="p"·data-group-id="5[·...·truncated·by·diffoscope;·len:·9,·SHA:·978f994a5c11e8ca8040042abe53e567dbbc69a6b51548dcc1f90cbb540efbbb·...·]-17">}</span><span·class="p">,</span><span·class="w">353 ······</span><span·class="p"·data-group-id="4282610634-17">{</span><span·class="ss">kind</span><span·class="p">,</span><span·class="p"·data-group-id="4282610634-18">[</span><span·class="s">&quot;custom&quot;</span><span·class="p"·data-group-id="4282610634-18">]</span><span·class="p"·data-group-id="4[·...·truncated·by·diffoscope;·len:·9,·SHA:·966ec2eb94571611d27fb9316c9444bac737cb52bff33c007ad03b38e151ed3c·...·]-17">}</span><span·class="p">,</span><span·class="w">
354 ······</span><span·class="p"·data-group-id="5929885951-19">{</span><span·class="ss">drive</span><span·class="p">,</span><span·class="p"·data-group-id="5929885951-20">[</span><span·class="s">&quot;belt&quot;</span><span·class="p"·data-group-id="5929885951-20">]</span><span·class="p"·data-group-id="59[·...·truncated·by·diffoscope;·len:·115,·SHA:·ba9f335321725c5ff6255ed1e1e9395d7fbba62719169eb24fc50aa73f925815·...·]-1">}</span></code></pre><p>In·order·to·append·this·data·to·the·end·of·the·motorcycles.xml·document·you·have354 ······</span><span·class="p"·data-group-id="4282610634-19">{</span><span·class="ss">drive</span><span·class="p">,</span><span·class="p"·data-group-id="4282610634-20">[</span><span·class="s">&quot;belt&quot;</span><span·class="p"·data-group-id="4282610634-20">]</span><span·class="p"·data-group-id="42[·...·truncated·by·diffoscope;·len:·115,·SHA:·8a0efd51e5961578806e848c5984fa105f84461130966e25243877720d49fea7·...·]-1">}</span></code></pre><p>In·order·to·append·this·data·to·the·end·of·the·motorcycles.xml·document·you·have
355 to·parse·the·file·and·add·Data·to·the·end·of·the·root·element·content.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p"·data-group-id="4053498872-1">{</span><span·class="n">RootEl</span><span·class="p">,</span><span·class="n">Misc</span><span·class="p"·data-group-id="4053498872-1">}</span><span·class="o">=</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">fi[·...·truncated·by·diffoscope;·len:·151,·SHA:·f7e46eafab3b6c18ca2afa1cf2e7b500298350d55ca47efe37fbcff06c62df0b·...·]2-2">)</span><span·class="p">,</span><span·class="w">355 to·parse·the·file·and·add·Data·to·the·end·of·the·root·element·content.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="p"·data-group-id="8624218742-1">{</span><span·class="n">RootEl</span><span·class="p">,</span><span·class="n">Misc</span><span·class="p"·data-group-id="8624218742-1">}</span><span·class="o">=</span><span·class="nc">xmerl_scan</span><span·class="p">:</span><span·class="nf">fi[·...·truncated·by·diffoscope;·len:·151,·SHA:·90c4f131465e0e60226d10b43ddae5caa6493b2261cce1743874cfee8d14cc48·...·]2-2">)</span><span·class="p">,</span><span·class="w">
356 ····</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4053498872-3">{</span><span·class="ss">content</span><span·class="o">=</span><span·class="n">Content</span><span·class="p"·data-group-id="4053498872-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RootEl</span><span·class="p">,</span><span·class="w">356 ····</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="8624218742-3">{</span><span·class="ss">content</span><span·class="o">=</span><span·class="n">Content</span><span·class="p"·data-group-id="8624218742-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="n">RootEl</span><span·class="p">,</span><span·class="w">
357 ····</span><span·class="n">NewContent</span><span·class="o">=</span><span·class="n">Content</span><span·class="o">++</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="4053498872-4">(</span><span·class="p"·data-group-id="4053498872-5">[</span><span·class="n">Data</span><span·class="p"·data-group-id="4053498872-5">]</span><span·class="p"·data-group-id="4053498872-4">)</span><span·class="p">,</span><span·class="w">357 ····</span><span·class="n">NewContent</span><span·class="o">=</span><span·class="n">Content</span><span·class="o">++</span><span·class="nc">lists</span><span·class="p">:</span><span·class="nf">flatten</span><span·class="p"·data-group-id="8624218742-4">(</span><span·class="p"·data-group-id="8624218742-5">[</span><span·class="n">Data</span><span·class="p"·data-group-id="8624218742-5">]</span><span·class="p"·data-group-id="8624218742-4">)</span><span·class="p">,</span><span·class="w">
358 ····</span><span·class="n">NewRootEl</span><span·class="o">=</span><span·class="n">RootEl</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4053498872-6">{</span><span·class="ss">content</span><span·class="o">=</span><span·class="n">NewContent</span><span·class="p"·data-group-id="4053498872-6">}</span><span·class="p">,</span></code></pre><p>Then·you·can·run·it·through·the·export_simple/2·funct[·...·truncated·by·diffoscope;·len:·675,·SHA:·1e764db18047ae22adc08f16c9575c3bc4c24742fb99bf5ef5217d8f71cfbbee·...·]-2">)</span><span·class="p">,</span><span·class="w">358 ····</span><span·class="n">NewRootEl</span><span·class="o">=</span><span·class="n">RootEl</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="8624218742-6">{</span><span·class="ss">content</span><span·class="o">=</span><span·class="n">NewContent</span><span·class="p"·data-group-id="8624218742-6">}</span><span·class="p">,</span></code></pre><p>Then·you·can·run·it·through·the·export_simple/2·funct[·...·truncated·by·diffoscope;·len:·675,·SHA:·4cfdd51a7dfdf6dcac8e80d3796b99bdca827e91c824be47f84e117bb84c40b0·...·]-2">)</span><span·class="p">,</span><span·class="w">
359 ····</span><span·class="n">Export</span><span·class="o">=</span><span·class="nc">xmerl</span><span·class="p">:</span><span·class="nf">export_simple</span><span·class="p"·data-group-id="5987110826-4">(</span><span·class="p"·data-group-id="5987110826-5">[</span><span·class="n">NewRootEl</span><span·class="p"·data-group-id="5987110826-5">]</span><span·class="p">,</span><span·class="ss">xmerl_xml</span><span·class="p"·data-group-id="59871108[·...·truncated·by·diffoscope;·len:·2,·SHA:·5f9c4ab08cac7457e9111a30e4664920607ea2c115a1433d7be98e97e64244ca·...·]-4">)</span><span·class="p">,</span><span·class="w">359 ····</span><span·class="n">Export</span><span·class="o">=</span><span·class="nc">xmerl</span><span·class="p">:</span><span·class="nf">export_simple</span><span·class="p"·data-group-id="8804153190-4">(</span><span·class="p"·data-group-id="8804153190-5">[</span><span·class="n">NewRootEl</span><span·class="p"·data-group-id="8804153190-5">]</span><span·class="p">,</span><span·class="ss">xmerl_xml</span><span·class="p"·data-group-id="88041531[·...·truncated·by·diffoscope;·len:·2,·SHA:·69f59c273b6e669ac32a6dd5e1b2cb63333d8b004f9696447aee2d422ce63763·...·]-4">)</span><span·class="p">,</span><span·class="w">
360 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="5987110826-6">(</span><span·class="n">IOF</span><span·class="p">,</span><span·class="s">&quot;</span><span·class="si">~s</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="5987110826-7">[</sp[·...·truncated·by·diffoscope;·len:·316,·SHA:·1e896be329ac2ee000f0617fb48f757bb9a734d10d094743058195a48b1c3e40·...·]-6">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="new_motorcyclesxml"></a></p><p>The·result·would·be:</p><pre><code·class="text">360 ····</span><span·class="nc">io</span><span·class="p">:</span><span·class="nf">format</span><span·class="p"·data-group-id="8804153190-6">(</span><span·class="n">IOF</span><span·class="p">,</span><span·class="s">&quot;</span><span·class="si">~s</span><span·class="si">~n</span><span·class="s">&quot;</span><span·class="p">,</span><span·class="p"·data-group-id="8804153190-7">[</sp[·...·truncated·by·diffoscope;·len:·316,·SHA:·f82f4613679a5ad87744f962bc6580fc1248e031a9155e80dc8bb737389609be·...·]-6">)</span><span·class="p">,</span></code></pre><p><a·href=""·id="new_motorcyclesxml"></a></p><p>The·result·would·be:</p><pre><code·class="text">
361 &lt;?xml·version=&quot;1.0&quot;?&gt;&lt;motorcycles&gt;361 &lt;?xml·version=&quot;1.0&quot;?&gt;&lt;motorcycles&gt;
362 ··&lt;bike·year=&quot;2000&quot;·color=&quot;black&quot;&gt;362 ··&lt;bike·year=&quot;2000&quot;·color=&quot;black&quot;&gt;
363 ····&lt;name&gt;363 ····&lt;name&gt;
364 ······&lt;manufacturer&gt;Suzuki&lt;/manufacturer&gt;364 ······&lt;manufacturer&gt;Suzuki&lt;/manufacturer&gt;
365 ······&lt;brandName&gt;Suzuki·VL·1500&lt;/brandName&gt;365 ······&lt;brandName&gt;Suzuki·VL·1500&lt;/brandName&gt;
366 ······&lt;additionalName&gt;Intruder&lt;/additionalName&gt;366 ······&lt;additionalName&gt;Intruder&lt;/additionalName&gt;
367 ····&lt;/name&gt;367 ····&lt;/name&gt;
Offset 383, 48 lines modifiedOffset 383, 48 lines modified
383 ··&lt;/bike&gt;383 ··&lt;/bike&gt;
384 &lt;bike·year=&quot;2003&quot;·color=&quot;black&quot;·condition=&quot;new&quot;&gt;&lt;name&gt;&lt;manufacturer&gt;Harley·Davidsson&lt;/manufacturer&gt;&lt;brandName&gt;XL1200C&lt;/brandName&gt;&lt;additionalName&gt;Sportster&lt;/additionalName&gt;&lt;/name&gt;&lt;engine&gt;V-engine,·2-cylinders,·1200·cc&lt;/engine&gt;&lt;kind&gt;custom&lt;/kind&gt;&lt;drive&gt;belt&lt;/drive&gt;&lt;/bike&gt;&lt;/motorcycles&gt;</code></pre><p>If·it·is·important·to·get·similar·indentation·and·newlines·as·in·the·original384 &lt;bike·year=&quot;2003&quot;·color=&quot;black&quot;·condition=&quot;new&quot;&gt;&lt;name&gt;&lt;manufacturer&gt;Harley·Davidsson&lt;/manufacturer&gt;&lt;brandName&gt;XL1200C&lt;/brandName&gt;&lt;additionalName&gt;Sportster&lt;/additionalName&gt;&lt;/name&gt;&lt;engine&gt;V-engine,·2-cylinders,·1200·cc&lt;/engine&gt;&lt;kind&gt;custom&lt;/kind&gt;&lt;drive&gt;belt&lt;/drive&gt;&lt;/bike&gt;&lt;/motorcycles&gt;</code></pre><p>If·it·is·important·to·get·similar·indentation·and·newlines·as·in·the·original
385 document·you·have·to·add·<code·class="inline">#xmlText{}</code>·records·with·space·and·newline·values·in385 document·you·have·to·add·<code·class="inline">#xmlText{}</code>·records·with·space·and·newline·values·in
386 appropriate·places.·It·may·also·be·necessary·to·keep·the·original·prolog·where386 appropriate·places.·It·may·also·be·necessary·to·keep·the·original·prolog·where
387 the·DTD·is·referenced.·If·so,·it·is·possible·to·pass·a·RootAttribute387 the·DTD·is·referenced.·If·so,·it·is·possible·to·pass·a·RootAttribute
388 <code·class="inline">{prolog,Value}</code>·to·<code·class="inline">export_simple/3</code>.·The·following·example·code·fixes·those388 <code·class="inline">{prolog,Value}</code>·to·<code·class="inline">export_simple/3</code>.·The·following·example·code·fixes·those
389 changes·in·the·previous·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">389 changes·in·the·previous·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="w">····</span><span·class="n">Data</span><span·class="w">·</span><span·class="o">=</span><span·class="w">
390 ······</span><span·class="p"·data-group-id="5797247026-1">[</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="5797247026-2">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;··&quot;</span><span·class="p"·data-group-id="57972[·...·truncated·by·diffoscope;·len:·5,·SHA:·89e92b9fbf50339c6f7bb900137359e45ad0c196bb5f6676dcdf8a162df0bdad·...·]-2">}</span><span·class="p">,</span><span·class="w">390 ······</span><span·class="p"·data-group-id="9633235612-1">[</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="9633235612-2">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;··&quot;</span><span·class="p"·data-group-id="96332[·...·truncated·by·diffoscope;·len:·5,·SHA:·4b791ebdb4929edc4a67e8401f1f34f5e7e3a9460dac386d2ee28ca390e5f1a0·...·]-2">}</span><span·class="p">,</span><span·class="w">
391 ·······</span><span·class="p"·data-group-id="5797247026-3">{</span><span·class="ss">bike</span><span·class="p">,</span><span·class="p"·data-group-id="5797247026-4">[</span><span·class="p"·data-group-id="5797247026-5">{</span><span·class="ss">year</span><span·class="p">,</span><span·class="s">&quot;20[·...·truncated·by·diffoscope;·len:·557,·SHA:·2c545ee3043abe6fc9601739edd326131223e67a9d8a4971b284d9a66b95b086·...·]-4">]</span><span·class="p">,</span><span·class="w">391 ·······</span><span·class="p"·data-group-id="9633235612-3">{</span><span·class="ss">bike</span><span·class="p">,</span><span·class="p"·data-group-id="9633235612-4">[</span><span·class="p"·data-group-id="9633235612-5">{</span><span·class="ss">year</span><span·class="p">,</span><span·class="s">&quot;20[·...·truncated·by·diffoscope;·len:·557,·SHA:·e1c89688a1bcc99d476eee2261ccf23454af95222cb780c6d3f8ea068f0f969e·...·]-4">]</span><span·class="p">,</span><span·class="w">
392 ·············</span><span·class="p"·data-group-id="5797247026-8">[</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="5797247026-9">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\392 ·············</span><span·class="p"·data-group-id="9633235612-8">[</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="9633235612-9">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\
393 ····&quot;</span><span·class="p"·data-group-id="5797247026-9">}</span><span·class="p">,</span><span·class="w">393 ····&quot;</span><span·class="p"·data-group-id="9633235612-9">}</span><span·class="p">,</span><span·class="w">
394 ··············</span><span·class="p"·data-group-id="5797247026-10">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="p"·data-group-id="5797247026-11">[</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="5797247026-12">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\394 ··············</span><span·class="p"·data-group-id="9633235612-10">{</span><span·class="ss">name</span><span·class="p">,</span><span·class="p"·data-group-id="9633235612-11">[</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="9633235612-12">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\
395 ······&quot;</span><span·class="p"·data-group-id="5797247026-12">}</span><span·class="p">,</span><span·class="w">395 ······&quot;</span><span·class="p"·data-group-id="9633235612-12">}</span><span·class="p">,</span><span·class="w">
396 ·····················</span><span·class="p"·data-group-id="5797247026-13">{</span><span·class="ss">manufacturer</span><span·class="p">,</span><span·class="p"·data-group-id="5797247026-14">[</span><span·class="s">&quot;Harley·Davidsson&quot;</span><span·class="p"·data-group-id="5797247026-14">]</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·dbafa4ce33350a6aeddf190d501d6bf51e33e6dd3940c96a917038d749a33a8c·...·]-13">}</span><span·class="p">,</span><span·class="w">396 ·····················</span><span·class="p"·data-group-id="9633235612-13">{</span><span·class="ss">manufacturer</span><span·class="p">,</span><span·class="p"·data-group-id="9633235612-14">[</span><span·class="s">&quot;Harley·Davidsson&quot;</span><span·class="p"·data-group-id="9633235612-14">]</span><span·class="p[·...·truncated·by·diffoscope;·len:·27,·SHA:·cd8adf2a7f86292a2d2e24b82fecebfa05aaacdf21fa4f008060e698521af64a·...·]-13">}</span><span·class="p">,</span><span·class="w">
397 ·····················</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="5797247026-15">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\397 ·····················</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="9633235612-15">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\
398 ······&quot;</span><span·class="p"·data-group-id="5797247026-15">}</span><span·class="p">,</span><span·class="w">398 ······&quot;</span><span·class="p"·data-group-id="9633235612-15">}</span><span·class="p">,</span><span·class="w">
399 ·····················</span><span·class="p"·data-group-id="5797247026-16">{</span><span·class="ss">brandName</span><span·class="p">,</span><span·class="p"·data-group-id="5797247026-17">[</span><span·class="s">&quot;XL1200C&quot;</span><span·class="p"·data-group-id="5797247026-17">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·8feb800fb81536fd72eed5d7a3fefe14ea0db7640b28b0913b6cd2188bc725d2·...·]-16">}</span><span·class="p">,</span><span·class="w">399 ·····················</span><span·class="p"·data-group-id="9633235612-16">{</span><span·class="ss">brandName</span><span·class="p">,</span><span·class="p"·data-group-id="9633235612-17">[</span><span·class="s">&quot;XL1200C&quot;</span><span·class="p"·data-group-id="9633235612-17">]</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·15,·SHA:·a3d1139084a68bb0c006202b444ada2554e2d8abc42d11d9235a600c8a71203f·...·]-16">}</span><span·class="p">,</span><span·class="w">
400 ·····················</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="5797247026-18">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\400 ·····················</span><span·class="o">#</span><span·class="ss">xmlText</span><span·class="p"·data-group-id="9633235612-18">{</span><span·class="ss">value</span><span·class="o">=</span><span·class="s">&quot;\
401 ······&quot;</span><span·class="p"·data-group-id="5797247026-18">}</span><span·class="p">,</span><span·class="w">401 ······&quot;</span><span·class="p"·data-group-id="9633235612-18">}</span><span·class="p">,</span><span·class="w">
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490 ······<p·class="built-using">490 ······<p·class="built-using">
491 ········Built·using491 ········Built·using
492 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the492 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
493 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>493 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
494 ······</p>494 ······</p>
495 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>495 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
496 ····</footer>496 ····</footer>
497 ··</div>497 ··</div>
498 </main>498 </main>
499 </div>499 </div>
500 <script>500 <script>
501 ··function·mermaidLoaded()·{501 ··function·mermaidLoaded()·{
502 ····mermaid.initialize({502 ····mermaid.initialize({
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367 ······<p·class="built-using">367 ······<p·class="built-using">
368 ········Built·using368 ········Built·using
369 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the369 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
370 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>370 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
371 ······</p>371 ······</p>
372 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>372 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
373 ····</footer>373 ····</footer>
374 ··</div>374 ··</div>
375 </main>375 </main>
376 </div>376 </div>
377 <script>377 <script>
378 ··function·mermaidLoaded()·{378 ··function·mermaidLoaded()·{
379 ····mermaid.initialize({379 ····mermaid.initialize({
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131 ··</a>131 ··</a>
132 ··<span·class="text">Examples</span>132 ··<span·class="text">Examples</span>
133 </h3>133 </h3>
134 <hr·class="thin"/><h4>Example·1·Using·xslapply</h4><p>original·XSLT:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;doc/title&quot;</span><span·class="o">&gt;</span><span·class="w">134 <hr·class="thin"/><h4>Example·1·Using·xslapply</h4><p>original·XSLT:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;doc/title&quot;</span><span·class="o">&gt;</span><span·class="w">
135 ····</span><span·class="o">&lt;</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="w">135 ····</span><span·class="o">&lt;</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="w">
136 ······</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="nb">apply</span><span·class="o">-</span><span·class="ss">templates</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">136 ······</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="nb">apply</span><span·class="o">-</span><span·class="ss">templates</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">
137 ····</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="w">137 ····</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="w">
138 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span></code></pre><p>becomes·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="4057660600-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4057660600-2">{</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·630,·SHA:·34b36cc1be6ebff26ee10de53a2037097c408878efedce09889adabd1c989e3b·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">138 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span></code></pre><p>becomes·in·Erlang:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="6683768321-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="6683768321-2">{</span><span·class="w">·</span><sp[·...·truncated·by·diffoscope;·len:·630,·SHA:·c98a4a675197cef848507e1a20e16e286b4942781ca1b3e211ff158304cfa3b1·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
139 ····</span><span·class="p"·data-group-id="4057660600-5">[</span><span·class="s">&quot;&lt;h1&gt;&quot;</span><span·class="p">,</span><span·class="w">139 ····</span><span·class="p"·data-group-id="6683768321-5">[</span><span·class="s">&quot;&lt;h1&gt;&quot;</span><span·class="p">,</span><span·class="w">
140 ·········</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4057660600-6">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·2840df08d9d2feafbf585470e998160b888a2519419e69f97fb08bd1ffd6c422·...·]-6">)</span><span·class="p">,</span><span·class="w">140 ·········</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="6683768321-6">(</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·class="p"·data-group-id="[·...·truncated·by·diffoscope;·len:·10,·SHA:·0b0bfe531bbb404799b9a64dcef71b1fdd1a2e175b4a690b6f416ff53b84ed9f·...·]-6">)</span><span·class="p">,</span><span·class="w">
141 ·····</span><span·class="s">&quot;&lt;/h1&gt;&quot;</span><span·class="p"·data-group-id="4057660600-5">]</span><span·class="p">;</span></code></pre><hr·class="thin"/><hr·class="thin"/><h4>Example·2·Using·value_of·and·select</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;title&quot;</span><span·class="o">&gt;</span><span·class="w">141 ·····</span><span·class="s">&quot;&lt;/h1&gt;&quot;</span><span·class="p"·data-group-id="6683768321-5">]</span><span·class="p">;</span></code></pre><hr·class="thin"/><hr·class="thin"/><h4>Example·2·Using·value_of·and·select</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;title&quot;</span><span·class="o">&gt;</span><span·class="w">
142 ··</span><span·class="o">&lt;</span><span·class="ow">div</span><span·class="w">·</span><span·class="ss">align</span><span·class="o">=</span><span·class="s">&quot;center&quot;</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">value</span><span·class="o">-</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">select</span><span·class="o">=</span><span·class="s">&quot;.&quot;</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ow">div</span><span·class="o">&gt;</span><span·class="w">142 ··</span><span·class="o">&lt;</span><span·class="ow">div</span><span·class="w">·</span><span·class="ss">align</span><span·class="o">=</span><span·class="s">&quot;center&quot;</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">value</span><span·class="o">-</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">select</span><span·class="o">=</span><span·class="s">&quot;.&quot;</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">h1</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ow">div</span><span·class="o">&gt;</span><span·class="w">
143 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span></code></pre><p>becomes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="3943962784-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="3943962784-2">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·158,·SHA:·4bfe066adcbb4099a829ba7359dba4613414b5bf19e5d540f3cd315a5fa2f2cd·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">143 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span></code></pre><p>becomes:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="9917025782-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="9917025782-2">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·158,·SHA:·91b517090b72c70a0cec2b3011a9991783d93668cda272b3c73eb124fd644f32·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
144 ····</span><span·class="p"·data-group-id="3943962784-3">[</span><span·class="s">&quot;&lt;div·align=\&quot;center\&quot;&gt;&lt;h1&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="3943962784-4">(</span><span·class="nf">s[·...·truncated·by·diffoscope;·len:·426,·SHA:·85ad8feb112b18a38f1bfe5d914309190b2afad29515f1d857c9c4ec84f026b7·...·]-3">]</span><span·class="p">;</span></code></pre><hr·class="thin"/><hr·class="thin"/><h4>Example·3·Simple·xsl·stylesheet</h4><p>A·complete·example·with·the·XSLT·sheet·in·the·xmerl·distribution.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">stylesheet</span><span·class="w">·</span><span·class="ss">version</span><span·class="o">=</span><span·class="s">&quot;1.0&quot;</span><span·class="w">144 ····</span><span·class="p"·data-group-id="9917025782-3">[</span><span·class="s">&quot;&lt;div·align=\&quot;center\&quot;&gt;&lt;h1&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9917025782-4">(</span><span·class="nf">s[·...·truncated·by·diffoscope;·len:·426,·SHA:·06ae3b64e8559577bb149b47a2ba69e28697345b5d80581bfb842356b7104a33·...·]-3">]</span><span·class="p">;</span></code></pre><hr·class="thin"/><hr·class="thin"/><h4>Example·3·Simple·xsl·stylesheet</h4><p>A·complete·example·with·the·XSLT·sheet·in·the·xmerl·distribution.</p><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">stylesheet</span><span·class="w">·</span><span·class="ss">version</span><span·class="o">=</span><span·class="s">&quot;1.0&quot;</span><span·class="w">
145 ········</span><span·class="nc">xmlns</span><span·class="p">:</span><span·class="ss">xsl</span><span·class="o">=</span><span·class="s">&quot;http://www.w3.org/1999/XSL/Transform&quot;</span><span·class="w">145 ········</span><span·class="nc">xmlns</span><span·class="p">:</span><span·class="ss">xsl</span><span·class="o">=</span><span·class="s">&quot;http://www.w3.org/1999/XSL/Transform&quot;</span><span·class="w">
146 ········</span><span·class="ss">xmlns</span><span·class="o">=</span><span·class="s">&quot;http://www.w3.org/TR/xhtml1/strict&quot;</span><span·class="o">&gt;</span><span·class="w">146 ········</span><span·class="ss">xmlns</span><span·class="o">=</span><span·class="s">&quot;http://www.w3.org/TR/xhtml1/strict&quot;</span><span·class="o">&gt;</span><span·class="w">
  
147 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">strip</span><span·class="o">-</span><span·class="ss">space</span><span·class="w">·</span><span·class="ss">elements</span><span·class="o">=</span><span·class="s">&quot;doc·chapter·section&quot;</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">147 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">strip</span><span·class="o">-</span><span·class="ss">space</span><span·class="w">·</span><span·class="ss">elements</span><span·class="o">=</span><span·class="s">&quot;doc·chapter·section&quot;</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">
148 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">output</span><span·class="w">148 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">output</span><span·class="w">
149 ····</span><span·class="ss">method</span><span·class="o">=</span><span·class="s">&quot;xml&quot;</span><span·class="w">149 ····</span><span·class="ss">method</span><span·class="o">=</span><span·class="s">&quot;xml&quot;</span><span·class="w">
150 ····</span><span·class="ss">indent</span><span·class="o">=</span><span·class="s">&quot;yes&quot;</span><span·class="w">150 ····</span><span·class="ss">indent</span><span·class="o">=</span><span·class="s">&quot;yes&quot;</span><span·class="w">
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198 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;emph&quot;</span><span·class="o">&gt;</span><span·class="w">198 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;emph&quot;</span><span·class="o">&gt;</span><span·class="w">
199 ····</span><span·class="o">&lt;</span><span·class="ss">em</span><span·class="o">&gt;</span><span·class="w">199 ····</span><span·class="o">&lt;</span><span·class="ss">em</span><span·class="o">&gt;</span><span·class="w">
200 ······</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="nb">apply</span><span·class="o">-</span><span·class="ss">templates</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">200 ······</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="nb">apply</span><span·class="o">-</span><span·class="ss">templates</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">
201 ····</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">em</span><span·class="o">&gt;</span><span·class="w">201 ····</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">em</span><span·class="o">&gt;</span><span·class="w">
202 ··</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span><span·class="w">202 ··</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span><span·class="w">
  
203 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">stylesheet</span><span·class="o">&gt;</span></code></pre><hr·class="thin"/><hr·class="thin"/><h4>Example·4·Erlang·version</h4><p>Erlang·transformation·of·previous·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="4473765328-1">(</span><span·class="s">&quot;xmerl.hrl&quot;</span><span·class="p"·data-group-id="4473765328-1">)</span><span·class="p">.</span><span·class="w">203 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">stylesheet</span><span·class="o">&gt;</span></code></pre><hr·class="thin"/><hr·class="thin"/><h4>Example·4·Erlang·version</h4><p>Erlang·transformation·of·previous·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="p">-</span><span·class="na">include</span><span·class="p"·data-group-id="5918403951-1">(</span><span·class="s">&quot;xmerl.hrl&quot;</span><span·class="p"·data-group-id="5918403951-1">)</span><span·class="p">.</span><span·class="w">
204 </span><span·class="w">204 </span><span·class="w">
205 </span><span·class="p">-</span><span·class="na">import</span><span·class="p"·data-group-id="4473765328-2">(</span><span·class="ss">xmerl_xs</span><span·class="p">,</span><span·class="w">205 </span><span·class="p">-</span><span·class="na">import</span><span·class="p"·data-group-id="5918403951-2">(</span><span·class="ss">xmerl_xs</span><span·class="p">,</span><span·class="w">
206 ····</span><span·class="p"·data-group-id="4473765328-3">[</span><span·class="w">·</span><span·class="ss">xslapply</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">value_of</span><span·class="p">/</span><span·class="mi">1</span>[·...·truncated·by·diffoscope;·len:·380,·SHA:·c6d0122d1f58544c0e127306a996cd1e73c93d8d0b23b2782c1957fcca228cf9·...·]-2">)</span><span·class="p">.</span><span·class="w">206 ····</span><span·class="p"·data-group-id="5918403951-3">[</span><span·class="w">·</span><span·class="ss">xslapply</span><span·class="p">/</span><span·class="mi">2</span><span·class="p">,</span><span·class="w">·</span><span·class="ss">value_of</span><span·class="p">/</span><span·class="mi">1</span>[·...·truncated·by·diffoscope;·len:·380,·SHA:·9928b0ab1a8aebc321ec6074bc7df62c400ad084bcfb9c1654b34d2bf571ce7a·...·]-2">)</span><span·class="p">.</span><span·class="w">
  
207 </span><span·class="nf">doctype</span><span·class="p"·data-group-id="4473765328-4">(</span><span·class="p"·data-group-id="4473765328-4">)</span><span·class="p">-&gt;</span><span·class="w">207 </span><span·class="nf">doctype</span><span·class="p"·data-group-id="5918403951-4">(</span><span·class="p"·data-group-id="5918403951-4">)</span><span·class="p">-&gt;</span><span·class="w">
208 ····</span><span·class="s">&quot;&lt;!DOCTYPE·html·PUBLIC·\&quot;-//W3C//DTD·XHTML·1.0·Transitional//EN\&quot;\208 ····</span><span·class="s">&quot;&lt;!DOCTYPE·html·PUBLIC·\&quot;-//W3C//DTD·XHTML·1.0·Transitional//EN\&quot;\
209 ·\&quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd·\&quot;&gt;&quot;</span><span·class="p">.</span><span·class="w">209 ·\&quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd·\&quot;&gt;&quot;</span><span·class="p">.</span><span·class="w">
  
210 </span><span·class="nf">process_xml</span><span·class="p"·data-group-id="4473765328-5">(</span><span·class="n">Doc</span><span·class="p"·data-group-id="4473765328-5">)</span><span·class="p">-&gt;</span><span·class="w">210 </span><span·class="nf">process_xml</span><span·class="p"·data-group-id="5918403951-5">(</span><span·class="n">Doc</span><span·class="p"·data-group-id="5918403951-5">)</span><span·class="p">-&gt;</span><span·class="w">
211 ····</span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-6">(</span><span·class="n">Doc</span><span·class="p"·data-group-id="4473765328-6">)</span><span·class="p">.</span><span·class="w">211 ····</span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-6">(</span><span·class="n">Doc</span><span·class="p"·data-group-id="5918403951-6">)</span><span·class="p">.</span><span·class="w">
  
212 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-7">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-8">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·156,·SHA:·68c9e5f5113553db58147416c62ca149295c5f9fb7c65fac07968e8326432dc3·...·]-7">)</span><span·class="p">-&gt;</span><span·class="w">212 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-7">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-8">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·156,·SHA:·b02c8a42711cd55d7ee90cacc55359fe7e3b95f5112ad9a0583f5b19b528c48c·...·]-7">)</span><span·class="p">-&gt;</span><span·class="w">
213 ····</span><span·class="p"·data-group-id="4473765328-9">[</span><span·class="w">·</span><span·class="s">&quot;&lt;\?xml·version=\&quot;1.0\&quot;·encoding=\&quot;iso-8859-1\&quot;\?&gt;&quot;</span><span·class="p">,</span><span·class="w">213 ····</span><span·class="p"·data-group-id="5918403951-9">[</span><span·class="w">·</span><span·class="s">&quot;&lt;\?xml·version=\&quot;1.0\&quot;·encoding=\&quot;iso-8859-1\&quot;\?&gt;&quot;</span><span·class="p">,</span><span·class="w">
214 ······</span><span·class="nf">doctype</span><span·class="p"·data-group-id="4473765328-10">(</span><span·class="p"·data-group-id="4473765328-10">)</span><span·class="p">,</span><span·class="w">214 ······</span><span·class="nf">doctype</span><span·class="p"·data-group-id="5918403951-10">(</span><span·class="p"·data-group-id="5918403951-10">)</span><span·class="p">,</span><span·class="w">
215 ······</span><span·class="s">&quot;&lt;html·xmlns=\&quot;http://www.w3.org/1999/xhtml\&quot;·&gt;&quot;</span><span·class="w">215 ······</span><span·class="s">&quot;&lt;html·xmlns=\&quot;http://www.w3.org/1999/xhtml\&quot;·&gt;&quot;</span><span·class="w">
216 ······</span><span·class="s">&quot;&lt;head&gt;&quot;</span><span·class="w">216 ······</span><span·class="s">&quot;&lt;head&gt;&quot;</span><span·class="w">
217 ······</span><span·class="s">&quot;&lt;title&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="4473765328-11">(</span><span·class="nf">select</span><span·class="p"·data-group-id="4473765328-12">(</span><span·class="s">&quot;title&quot;</span><span·class="p">,</span><span·class="n">E</span><span·class="p"·data-group-id="4473765328-12">)</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·48344d885945dd4f4607495d0f9ae0d09900ab16d3d0e570af04f8408031fd33·...·]-11">)</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&lt;/title&gt;&quot;</span><span·class="w">217 ······</span><span·class="s">&quot;&lt;title&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="5918403951-11">(</span><span·class="nf">select</span><span·class="p"·data-group-id="5918403951-12">(</span><span·class="s">&quot;title&quot;</span><span·class="p">,</span><span·class="n">E</span><span·class="p"·data-group-id="5918403951-12">)</span><span·c[·...·truncated·by·diffoscope;·len:·34,·SHA:·06fe81528de1fc69d199d3d3ea147e149340d731ec2cfc493855e59befd371d6·...·]-11">)</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&lt;/title&gt;&quot;</span><span·class="w">
218 ······</span><span·class="s">&quot;&lt;/head&gt;&quot;</span><span·class="w">218 ······</span><span·class="s">&quot;&lt;/head&gt;&quot;</span><span·class="w">
219 ······</span><span·class="s">&quot;&lt;body&gt;&quot;</span><span·class="p">,</span><span·class="w">219 ······</span><span·class="s">&quot;&lt;body&gt;&quot;</span><span·class="p">,</span><span·class="w">
220 ······</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-13">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·d1eea0a3226ae0918847bfc9e195d5002819cccc3da5de3a8c315abcceab9ec9·...·]-13">)</span><span·class="p">,</span><span·class="w">220 ······</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-13">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·e9877e78c8c7d3514180838a87762e974f724203da086354fba9071874461e17·...·]-13">)</span><span·class="p">,</span><span·class="w">
221 ······</span><span·class="s">&quot;&lt;/body&gt;&quot;</span><span·class="w">221 ······</span><span·class="s">&quot;&lt;/body&gt;&quot;</span><span·class="w">
222 ······</span><span·class="s">&quot;&lt;/html&gt;&quot;</span><span·class="w">·</span><span·class="p"·data-group-id="4473765328-9">]</span><span·class="p">;</span><span·class="w">222 ······</span><span·class="s">&quot;&lt;/html&gt;&quot;</span><span·class="w">·</span><span·class="p"·data-group-id="5918403951-9">]</span><span·class="p">;</span><span·class="w">
  
  
223 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-14">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-15">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·637,·SHA:·d114b0ae89b0bff6b9f09f136a6a4fbf55b2c672427113bbb8960e4f34bf9e2b·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">223 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-14">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-15">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·637,·SHA:·5993434fd8c9e22f1ab8d13e5022d6685bbbc5cd6393c2b9b8463ea7f9bad4a0·...·]-14">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
224 ····</span><span·class="p"·data-group-id="4473765328-18">[</span><span·class="s">&quot;&lt;h1&gt;&quot;</span><span·class="p">,</span><span·class="w">224 ····</span><span·class="p"·data-group-id="5918403951-18">[</span><span·class="s">&quot;&lt;h1&gt;&quot;</span><span·class="p">,</span><span·class="w">
225 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-19">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·d1eea0a3226ae0918847bfc9e195d5002819cccc3da5de3a8c315abcceab9ec9·...·]-19">)</span><span·class="p">,</span><span·class="w">225 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-19">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·e9877e78c8c7d3514180838a87762e974f724203da086354fba9071874461e17·...·]-19">)</span><span·class="p">,</span><span·class="w">
226 ·····</span><span·class="s">&quot;&lt;/h1&gt;&quot;</span><span·class="p"·data-group-id="4473765328-18">]</span><span·class="p">;</span><span·class="w">226 ·····</span><span·class="s">&quot;&lt;/h1&gt;&quot;</span><span·class="p"·data-group-id="5918403951-18">]</span><span·class="p">;</span><span·class="w">
  
227 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-20">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-21">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·641,·SHA:·044db80356f54ed9a6e9fab264b4b894ad9a2a7bcb0b6216b125f91cdbdecceb·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">227 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-20">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-21">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·641,·SHA:·26a0d97bd82647ecb4dc399bedc1ed6a3b154d75db9da7f71a45b20bc55d85c8·...·]-20">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
228 ····</span><span·class="p"·data-group-id="4473765328-24">[</span><span·class="s">&quot;&lt;h2&gt;&quot;</span><span·class="p">,</span><span·class="w">228 ····</span><span·class="p"·data-group-id="5918403951-24">[</span><span·class="s">&quot;&lt;h2&gt;&quot;</span><span·class="p">,</span><span·class="w">
229 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-25">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·d1eea0a3226ae0918847bfc9e195d5002819cccc3da5de3a8c315abcceab9ec9·...·]-25">)</span><span·class="p">,</span><span·class="w">229 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-25">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·e9877e78c8c7d3514180838a87762e974f724203da086354fba9071874461e17·...·]-25">)</span><span·class="p">,</span><span·class="w">
230 ·····</span><span·class="s">&quot;&lt;/h2&gt;&quot;</span><span·class="p"·data-group-id="4473765328-24">]</span><span·class="p">;</span><span·class="w">230 ·····</span><span·class="s">&quot;&lt;/h2&gt;&quot;</span><span·class="p"·data-group-id="5918403951-24">]</span><span·class="p">;</span><span·class="w">
  
231 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-26">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-27">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·641,·SHA:·d1b980351d72598ead5b7e375056cec0fdc526909add82373491011be5d882ea·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">231 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-26">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-27">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·641,·SHA:·362c67fb3730cfea320b0465312d7e0e38ef88d33395a913467724ca9db2c923·...·]-26">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
232 ····</span><span·class="p"·data-group-id="4473765328-30">[</span><span·class="s">&quot;&lt;h3&gt;&quot;</span><span·class="p">,</span><span·class="w">232 ····</span><span·class="p"·data-group-id="5918403951-30">[</span><span·class="s">&quot;&lt;h3&gt;&quot;</span><span·class="p">,</span><span·class="w">
233 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-31">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·d1eea0a3226ae0918847bfc9e195d5002819cccc3da5de3a8c315abcceab9ec9·...·]-31">)</span><span·class="p">,</span><span·class="w">233 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-31">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·e9877e78c8c7d3514180838a87762e974f724203da086354fba9071874461e17·...·]-31">)</span><span·class="p">,</span><span·class="w">
234 ·····</span><span·class="s">&quot;&lt;/h3&gt;&quot;</span><span·class="p"·data-group-id="4473765328-30">]</span><span·class="p">;</span><span·class="w">234 ·····</span><span·class="s">&quot;&lt;/h3&gt;&quot;</span><span·class="p"·data-group-id="5918403951-30">]</span><span·class="p">;</span><span·class="w">
  
235 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-32">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-33">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·184,·SHA:·679e5c45e0df5953f4b7473f2b742850d124337ac8f92d41e95cc3afd18687d1·...·]-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">235 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-32">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-33">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·184,·SHA:·ef82aa3f75c1d5183f3e4220d1a19f025cf53248c8ac2e62a8d59f43fdba2760·...·]-32">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
236 ····</span><span·class="p"·data-group-id="4473765328-34">[</span><span·class="s">&quot;&lt;p&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-35">(</span><span·class="w">·</span><span·class="k">fun</span><span[·...·truncated·by·diffoscope;·len:·360,·SHA:·a94ea9fc457dcd060ca6530f8c0b210a4ec3c74a1e7f75893a2e2d9b06248587·...·]-34">]</span><span·class="p">;</span><span·class="w">236 ····</span><span·class="p"·data-group-id="5918403951-34">[</span><span·class="s">&quot;&lt;p&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-35">(</span><span·class="w">·</span><span·class="k">fun</span><span[·...·truncated·by·diffoscope;·len:·360,·SHA:·3f31d7fe5c9ef452517770c65ac4e3bed35a3384bb22d3cb2cc16f526e713b19·...·]-34">]</span><span·class="p">;</span><span·class="w">
  
237 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-36">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-37">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·184,·SHA:·2c8c5e607b66aa75dd9285401e419b7db3ee1cad95078a01790bac2afe872db7·...·]-36">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">237 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-36">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-37">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·184,·SHA:·f82cff283dab73ce02dc512a71eaa1ad11a2f3e8940a99b632bc5c233cb09f06·...·]-36">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
238 ····</span><span·class="p"·data-group-id="4473765328-38">[</span><span·class="s">&quot;&lt;p·class=\&quot;note\&quot;&gt;&quot;</span><span·class="w">238 ····</span><span·class="p"·data-group-id="5918403951-38">[</span><span·class="s">&quot;&lt;p·class=\&quot;note\&quot;&gt;&quot;</span><span·class="w">
239 ·····</span><span·class="s">&quot;&lt;b&gt;NOTE:·&lt;/b&gt;&quot;</span><span·class="p">,</span><span·class="w">239 ·····</span><span·class="s">&quot;&lt;b&gt;NOTE:·&lt;/b&gt;&quot;</span><span·class="p">,</span><span·class="w">
240 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-39">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·d1eea0a3226ae0918847bfc9e195d5002819cccc3da5de3a8c315abcceab9ec9·...·]-39">)</span><span·class="p">,</span><span·class="w">240 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-39">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·e9877e78c8c7d3514180838a87762e974f724203da086354fba9071874461e17·...·]-39">)</span><span·class="p">,</span><span·class="w">
241 ·····</span><span·class="s">&quot;&lt;/p&gt;&quot;</span><span·class="p"·data-group-id="4473765328-38">]</span><span·class="p">;</span><span·class="w">241 ·····</span><span·class="s">&quot;&lt;/p&gt;&quot;</span><span·class="p"·data-group-id="5918403951-38">]</span><span·class="p">;</span><span·class="w">
  
242 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-40">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="4473765328-41">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·184,·SHA:·f92ef94a964e78429347707d0f0d8cc0626335c29b58579ec7a6508e019bbf61·...·]-40">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">242 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-40">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="5918403951-41">{</span><span·class="w">·</span><[·...·truncated·by·diffoscope;·len:·184,·SHA:·b37b66937fa349a1380f13e1a7c85209a57b561eec08b3edef8932b3fc80bca2·...·]-40">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
243 ····</span><span·class="p"·data-group-id="4473765328-42">[</span><span·class="s">&quot;&lt;em&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="4473765328-43">(</span><span·class="w">·</span><span·class="k">fun</span><spa[·...·truncated·by·diffoscope;·len:·362,·SHA:·d32777ebcc8f1362fc7facf1060089ec1aa6aa9ce28c0d21cc26fabc510f8209·...·]-42">]</span><span·class="p">;</span><span·class="w">243 ····</span><span·class="p"·data-group-id="5918403951-42">[</span><span·class="s">&quot;&lt;em&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="5918403951-43">(</span><span·class="w">·</span><span·class="k">fun</span><spa[·...·truncated·by·diffoscope;·len:·362,·SHA:·4fb1d6e22f0e3b8639e0473e1e002778212db1bc8ecf3dfbbe8be8eff7bf0565·...·]-42">]</span><span·class="p">;</span><span·class="w">
  
244 </span><span·class="nf">template</span><span·class="p"·data-group-id="4473765328-44">(</span><span·class="n">E</span><span·class="p"·data-group-id="4473765328-44">)</span><span·class="p">-&gt;</span><span·class="w">244 </span><span·class="nf">template</span><span·class="p"·data-group-id="5918403951-44">(</span><span·class="n">E</span><span·class="p"·data-group-id="5918403951-44">)</span><span·class="p">-&gt;</span><span·class="w">
245 ····</span><span·class="nf">built_in_rules</span><span·class="p"·data-group-id="4473765328-45">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·d1eea0a3226ae0918847bfc9e195d5002819cccc3da5de3a8c315abcceab9ec9·...·]-45">)</span><span·class="p">.</span></code></pre><p>It·is·important·to·end·with·a·call·to·<a·href="xmerl_xs.html#built_in_rules/2"><code·class="inline">xmerl_xs:built_in_rules/2</code></a>·if·you·want·any245 ····</span><span·class="nf">built_in_rules</span><span·class="p"·data-group-id="5918403951-45">(</span><span·class="w">·</span><span·class="k">fun</span><span·class="w">·</span><span·class="ss">template</span><span·class="p">/</span><span·class="mi">1</span><span·class="p">,</span><span·class="w">·</span><span·class="n">E</span><span·[·...·truncated·by·diffoscope;·len:·35,·SHA:·e9877e78c8c7d3514180838a87762e974f724203da086354fba9071874461e17·...·]-45">)</span><span·class="p">.</span></code></pre><p>It·is·important·to·end·with·a·call·to·<a·href="xmerl_xs.html#built_in_rules/2"><code·class="inline">xmerl_xs:built_in_rules/2</code></a>·if·you·want·any
246 text·to·be·written·in·&quot;push&quot;·transforms.·That·are·the·ones·using·a·lot·<code·class="inline">xslapply(·fun·template/1,·E·)</code>·instead·of·<code·class="inline">value_of(select(&quot;xpath&quot;,E))</code>,·which·is·pull...</p><hr·class="thin"/><p>The·largest·example·is·the·stylesheet·to·transform·this·document·from·the246 text·to·be·written·in·&quot;push&quot;·transforms.·That·are·the·ones·using·a·lot·<code·class="inline">xslapply(·fun·template/1,·E·)</code>·instead·of·<code·class="inline">value_of(select(&quot;xpath&quot;,E))</code>,·which·is·pull...</p><hr·class="thin"/><p>The·largest·example·is·the·stylesheet·to·transform·this·document·from·the
247 Simplified·Docbook·XML·format·to·xhtml.·The·source·file·is·sdocbook2xhtml.erl.</p><h3·id="tips-and-tricks"·class="section-heading">247 Simplified·Docbook·XML·format·to·xhtml.·The·source·file·is·sdocbook2xhtml.erl.</p><h3·id="tips-and-tricks"·class="section-heading">
248 ··<a·href="#tips-and-tricks"·class="hover-link">248 ··<a·href="#tips-and-tricks"·class="hover-link">
249 ····<i·class="ri-link-m"·aria-hidden="true"></i>249 ····<i·class="ri-link-m"·aria-hidden="true"></i>
250 ··</a>250 ··</a>
251 ··<span·class="text">Tips·and·tricks</span>251 ··<span·class="text">Tips·and·tricks</span>
252 </h3>252 </h3>
Offset 270, 29 lines modifiedOffset 270, 29 lines modified
270 position·in·Erlang.</p><hr·class="thin"/><h4>Example·5·Counting·positions</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;stanza&quot;</span><span·class="o">&gt;</span><span·class="w">270 position·in·Erlang.</p><hr·class="thin"/><h4>Example·5·Counting·positions</h4><pre><code·class="makeup·erlang"·translate="no"><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;stanza&quot;</span><span·class="o">&gt;</span><span·class="w">
271 ··</span><span·class="o">&lt;</span><span·class="ss">p</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="nb">apply</span><span·class="o">-</span><span·class="ss">templates</span><span·class="w">·</span><span·class="ss">select</span><span·class="o">=</span><span·class="s">&quot;line&quot;</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">p</span><span·class="o">&gt;</span><span·class="w">271 ··</span><span·class="o">&lt;</span><span·class="ss">p</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="nb">apply</span><span·class="o">-</span><span·class="ss">templates</span><span·class="w">·</span><span·class="ss">select</span><span·class="o">=</span><span·class="s">&quot;line&quot;</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="ss">p</span><span·class="o">&gt;</span><span·class="w">
272 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span><span·class="w">272 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span><span·class="w">
  
273 </span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;line&quot;</span><span·class="o">&gt;</span><span·class="w">273 </span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="w">·</span><span·class="ss">match</span><span·class="o">=</span><span·class="s">&quot;line&quot;</span><span·class="o">&gt;</span><span·class="w">
274 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="k">if</span><span·class="w">·</span><span·class="ss">test</span><span·class="o">=</span><span·class="s">&quot;position()·mod·2·=·0&quot;</span><span·class="o">&gt;</span><span·class="err">&amp;</span><span·class="p">#</span><span·class="mi">160</span><span·class="p">;</span><span·class="err">&amp;</span><span·class="p">#</span><span·class="mi">160</span><span·class="p">;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="k">if</span><span·class="o">&gt;</span><span·class="w">274 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="k">if</span><span·class="w">·</span><span·class="ss">test</span><span·class="o">=</span><span·class="s">&quot;position()·mod·2·=·0&quot;</span><span·class="o">&gt;</span><span·class="err">&amp;</span><span·class="p">#</span><span·class="mi">160</span><span·class="p">;</span><span·class="err">&amp;</span><span·class="p">#</span><span·class="mi">160</span><span·class="p">;</span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="k">if</span><span·class="o">&gt;</span><span·class="w">
275 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">value</span><span·class="o">-</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">select</span><span·class="o">=</span><span·class="s">&quot;.&quot;</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="ss">br</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">275 ··</span><span·class="o">&lt;</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">value</span><span·class="o">-</span><span·class="k">of</span><span·class="w">·</span><span·class="ss">select</span><span·class="o">=</span><span·class="s">&quot;.&quot;</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="o">&lt;</span><span·class="ss">br</span><span·class="w">·</span><span·class="o">/</span><span·class="o">&gt;</span><span·class="w">
276 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span></code></pre><p>Can·be·written·as</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="0250670334-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="0250670334-2">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·159,·SHA:·5d4254f75c42a460e447e427c045e7071e9690777e307c039bd864f984c00ed7·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">276 </span><span·class="o">&lt;</span><span·class="o">/</span><span·class="nc">xsl</span><span·class="p">:</span><span·class="ss">template</span><span·class="o">&gt;</span></code></pre><p>Can·be·written·as</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="3228728498-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="3228728498-2">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·159,·SHA:·6568a0424e9a58b1fcbbe74e159274ab6c786a85b051be90a3d6794800eb1c36·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
277 ····</span><span·class="p"·data-group-id="0250670334-3">{</span><span·class="n">Lines</span><span·class="p">,</span><span·class="n">LineNo</span><span·class="p"·data-group-id="0250670334-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span[·...·truncated·by·diffoscope;·len:·654,·SHA:·c5f17a4236c580c7f62eff5217861862992556ebfa3217b010ac9cbea08a4848·...·]-4">)</span><span·class="p">,</span><span·class="w">277 ····</span><span·class="p"·data-group-id="3228728498-3">{</span><span·class="n">Lines</span><span·class="p">,</span><span·class="n">LineNo</span><span·class="p"·data-group-id="3228728498-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">lists</span[·...·truncated·by·diffoscope;·len:·654,·SHA:·542f4b7fb6614ed69efcdae4c4e42371b987990ead040ce79185fc6755f3802b·...·]-4">)</span><span·class="p">,</span><span·class="w">
278 ····</span><span·class="p"·data-group-id="0250670334-6">[</span><span·class="s">&quot;&lt;p&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Lines</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&lt;/p&gt;&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·b99f0e92115b41796666d07f6d5e2d7264570833691c2666361e8d20f0034849·...·]-6">]</span><span·class="p">.</span><span·class="w">278 ····</span><span·class="p"·data-group-id="3228728498-6">[</span><span·class="s">&quot;&lt;p&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="n">Lines</span><span·class="p">,</span><span·class="w">·</span><span·class="s">&quot;&lt;/p&gt;&quot;</span><span·class="p"·data-[·...·truncated·by·diffoscope;·len:·20,·SHA:·148ce829d2683d3e2b6e33581816bf180e1d46668afb41ce191cb545c73335f6·...·]-6">]</span><span·class="p">.</span><span·class="w">
  
279 </span><span·class="nf">template_pos</span><span·class="p"·data-group-id="0250670334-7">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="0250670334-8">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·229,·SHA:·a4c8a23bb8dc9dc3f00135914eba0aa59d023a0b6f1f79f388603d94a081c2da·...·]-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">279 </span><span·class="nf">template_pos</span><span·class="p"·data-group-id="3228728498-7">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="3228728498-8">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·229,·SHA:·097cda67906d4b4951f50e606cc38c655f16748b11c6f70863f2c35aac3569f4·...·]-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
280 ····</span><span·class="p"·data-group-id="0250670334-9">{</span><span·class="p"·data-group-id="0250670334-10">[</span><span·class="nf">indent_line</span><span·class="p"·data-group-id="0250670334-11">(</span><span·class="n">P</span><span·class="w">·</span><span·class="ow">rem</span><span·class="w">[·...·truncated·by·diffoscope;·len:·795,·SHA:·1df0d47c3a1edf54912b0bcc1c3bb3551956be6a81b1cf1701fa4d1d92b87475·...·]-9">}</span><span·class="p">.</span><span·class="w">280 ····</span><span·class="p"·data-group-id="3228728498-9">{</span><span·class="p"·data-group-id="3228728498-10">[</span><span·class="nf">indent_line</span><span·class="p"·data-group-id="3228728498-11">(</span><span·class="n">P</span><span·class="w">·</span><span·class="ow">rem</span><span·class="w">[·...·truncated·by·diffoscope;·len:·795,·SHA:·74db10caf1fef990ef35b7f77afc6830cb327256a9bbbec2f5f42b9c626936d4·...·]-9">}</span><span·class="p">.</span><span·class="w">
  
281 </span><span·class="nf">indent_line</span><span·class="p"·data-group-id="0250670334-13">(</span><span·class="mi">0</span><span·class="p"·data-group-id="0250670334-13">)</span><span·class="p">-&gt;</span><span·class="s">&quot;&amp;#160;&amp;#160;&quot;</span><span·class="p">;</span><span·class="w">281 </span><span·class="nf">indent_line</span><span·class="p"·data-group-id="3228728498-13">(</span><span·class="mi">0</span><span·class="p"·data-group-id="3228728498-13">)</span><span·class="p">-&gt;</span><span·class="s">&quot;&amp;#160;&amp;#160;&quot;</span><span·class="p">;</span><span·class="w">
282 </span><span·class="nf">indent_line</span><span·class="p"·data-group-id="0250670334-14">(</span><span·class="p">_</span><span·class="p"·data-group-id="0250670334-14">)</span><span·class="p">-&gt;</span><span·class="s">&quot;&quot;</span><span·class="p">.</span></code></pre><hr·class="thin"/><h4>Global·tree·awareness</h4><p>In·XSLT·you·have·&quot;root&quot;·access·to·the·top·of·the·tree·with·XPath,·even·though282 </span><span·class="nf">indent_line</span><span·class="p"·data-group-id="3228728498-14">(</span><span·class="p">_</span><span·class="p"·data-group-id="3228728498-14">)</span><span·class="p">-&gt;</span><span·class="s">&quot;&quot;</span><span·class="p">.</span></code></pre><hr·class="thin"/><h4>Global·tree·awareness</h4><p>In·XSLT·you·have·&quot;root&quot;·access·to·the·top·of·the·tree·with·XPath,·even·though
283 you·are·somewhere·deep·in·your·tree.</p><p>The·xslapply/2·function·only·carries·back·the·child·part·of·the·tree·to·the283 you·are·somewhere·deep·in·your·tree.</p><p>The·xslapply/2·function·only·carries·back·the·child·part·of·the·tree·to·the
284 template·fun.·But·it·is·quite·easy·to·write·template·funs·that·handles·both·the284 template·fun.·But·it·is·quite·easy·to·write·template·funs·that·handles·both·the
285 child·and·top·tree.</p><hr·class="thin"/><h4>Example·6·Passing·the·root·tree</h4><p>The·following·example·piece·will·prepend·the·article·title·to·any·section·title</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="0002889943-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="0002889943-2">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·257,·SHA:·ded2f0823e4647cb3c74e103fa80a29ef390d42422b02c796aafa6f9045fdd6d·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">285 child·and·top·tree.</p><hr·class="thin"/><h4>Example·6·Passing·the·root·tree</h4><p>The·following·example·piece·will·prepend·the·article·title·to·any·section·title</p><pre><code·class="makeup·erlang"·translate="no"><span·class="nf">template</span><span·class="p"·data-group-id="9049791198-1">(</span><span·class="n">E</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="o">#</span><span·class="ss">xmlElement</span><span·class="p"·data-group-id="9049791198-2">{</span><span·class="ss">name</span[·...·truncated·by·diffoscope;·len:·257,·SHA:·43b2f2158605ed2c1b98ff37d494822f33cd5f378891fae0a5aabd1b51f26984·...·]-1">)</span><span·class="w">·</span><span·class="p">-&gt;</span><span·class="w">
286 ····</span><span·class="p"·data-group-id="0002889943-3">[</span><span·class="s">&quot;&lt;h3&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="0002889943-4">(</span><span·class="nf">select</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·236,·SHA:·7dec35ed0eb5868f3e7ce7ac179fe599b7854b914ce71b66243f1234a8904ff4·...·]-4">)</span><span·class="p">,</span><span·class="s">&quot;·-·&quot;</span><span·class="p">,</span><span·class="w">286 ····</span><span·class="p"·data-group-id="9049791198-3">[</span><span·class="s">&quot;&lt;h3&gt;&quot;</span><span·class="p">,</span><span·class="w">·</span><span·class="nf">value_of</span><span·class="p"·data-group-id="9049791198-4">(</span><span·class="nf">select</span><span·class="p"·data-group[·...·truncated·by·diffoscope;·len:·236,·SHA:·99d1187707b6f521cd090b1dd88ea05cd77579c5d2dfc2812f702ab9e640ede0·...·]-4">)</span><span·class="p">,</span><span·class="s">&quot;·-·&quot;</span><span·class="p">,</span><span·class="w">
287 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="0002889943-6">(</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="0002889943-7">(</span><span·class="n">A</span><span·class="p"·data-group-id="0002889943-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·423,·SHA:·a0ad1201b9629a55425851665c04244ba998d1a9976beca61be9f98d83f8f3b4·...·]-6">)</span><span·class="p">,</span><span·class="w">287 ·····</span><span·class="nf">xslapply</span><span·class="p"·data-group-id="9049791198-6">(</span><span·class="w">·</span><span·class="nf">fun</span><span·class="p"·data-group-id="9049791198-7">(</span><span·class="n">A</span><span·class="p"·data-group-id="9049791198-7">)</span><span·class="w">·</span><span·class="p">-&gt;</span><[·...·truncated·by·diffoscope;·len:·423,·SHA:·a24174be89abc05582af2a7866eb118c9f894a744c3e7ec890b4b7713a89b7a0·...·]-6">)</span><span·class="p">,</span><span·class="w">
288 ·····</span><span·class="s">&quot;&lt;/h3&gt;&quot;</span><span·class="p"·data-group-id="0002889943-3">]</span><span·class="p">;</span></code></pre><hr·class="thin"/>288 ·····</span><span·class="s">&quot;&lt;/h3&gt;&quot;</span><span·class="p"·data-group-id="9049791198-3">]</span><span·class="p">;</span></code></pre><hr·class="thin"/>
289 </div>289 </div>
  
290 <div·class="bottom-actions"·id="bottom-actions">290 <div·class="bottom-actions"·id="bottom-actions">
291 ··<div·class="bottom-actions-item">291 ··<div·class="bottom-actions-item">
  
292 ······<a·href="xmerl_examples.html"·class="bottom-actions-button"·rel="prev">292 ······<a·href="xmerl_examples.html"·class="bottom-actions-button"·rel="prev">
293 ········<span·class="subheader">293 ········<span·class="subheader">
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325 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>325 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
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772 parsed·XML·<a·href="xmerl.html#t:xmlElement/0"><code·class="inline">Element :: #xmlElement{}</code></a>772 parsed·XML·<a·href="xmerl.html#t:xmlElement/0"><code·class="inline">Element :: #xmlElement{}</code></a>
773 and·a·State,·<a·href="#t:global_state/0"><code·class="inline">global_state/0</code></a>,·which·holds·necessary·information773 and·a·State,·<a·href="#t:global_state/0"><code·class="inline">global_state/0</code></a>,·which·holds·necessary·information
774 from·an·already·processed·schema.··Thus·validate·enables·reuse774 from·an·already·processed·schema.··Thus·validate·enables·reuse
775 of·the·schema·information·and·therefore·if·one·shall·validate775 of·the·schema·information·and·therefore·if·one·shall·validate
776 several·times·towards·the·same·schema·it·reduces·time·consumption.</p><p>The·result,·<code·class="inline">ValidElement</code>,·is·the·valid·element·that·conforms·to·the776 several·times·towards·the·same·schema·it·reduces·time·consumption.</p><p>The·result,·<code·class="inline">ValidElement</code>,·is·the·valid·element·that·conforms·to·the
777 post-schema-validation·infoset.·When·the·validator·finds·an·error·it·tries·to777 post-schema-validation·infoset.·When·the·validator·finds·an·error·it·tries·to
778 continue·and·reports·a·list·of·all·errors·found.·In·those·cases·an·unexpected778 continue·and·reports·a·list·of·all·errors·found.·In·those·cases·an·unexpected
779 error·is·found·it·may·cause·a·single·error·reason.</p><p>Usage·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">1</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2592007269-1">{</span><span·class="n">E</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="2592007269-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><sp[·...·truncated·by·diffoscope;·len:·197,·SHA:·9589d0dedb2e5b1066b58eb57a46a74284253c21550fd3c70adcc1f2a6fe9423·...·]-2">)</span><span·class="p">.</span><span·class="w">779 error·is·found·it·may·cause·a·single·error·reason.</p><p>Usage·example:</p><pre><code·class="makeup·erlang"·translate="no"><span·class="mi">1</span><span·class="o">&gt;</span><span·class="p"·data-group-id="6963558710-1">{</span><span·class="n">E</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="6963558710-1">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_scan</span><sp[·...·truncated·by·diffoscope;·len:·197,·SHA:·f714a99315c68d7f07eabf09fa1e93bf54ef58cfb921cdd03c36a2472d0dcf59·...·]-2">)</span><span·class="p">.</span><span·class="w">
780 </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2592007269-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">S</span><span·class="p"·data-group-id="2592007269-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_xsd</span><s[·...·truncated·by·diffoscope;·len:·206,·SHA:·c81b86f22fab07c72c22d000b33440d1b678ca417928b97797931f4b783a4ba7·...·]-4">)</span><span·class="p">.</span><span·class="w">780 </span><span·class="mi">2</span><span·class="o">&gt;</span><span·class="p"·data-group-id="6963558710-3">{</span><span·class="ss">ok</span><span·class="p">,</span><span·class="n">S</span><span·class="p"·data-group-id="6963558710-3">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_xsd</span><s[·...·truncated·by·diffoscope;·len:·206,·SHA:·3264d290a0ae30114acabd0b0ad12450fcbfd55f3950352b95d47fb35bc837a6·...·]-4">)</span><span·class="p">.</span><span·class="w">
781 </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="p"·data-group-id="2592007269-5">{</span><span·class="n">E2</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="2592007269-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_xsd</span><sp[·...·truncated·by·diffoscope;·len:·219,·SHA:·4cf0564bcca479426141de5eddcb95a4ddf30837358ba2858baf6b7e21269b06·...·]-6">)</span><span·class="p">.</span></code></pre><p>Observe·that·E2·may·differ·from·E·if·for·instance·there·are·default·values781 </span><span·class="mi">3</span><span·class="o">&gt;</span><span·class="p"·data-group-id="6963558710-5">{</span><span·class="n">E2</span><span·class="p">,</span><span·class="p">_</span><span·class="p"·data-group-id="6963558710-5">}</span><span·class="w">·</span><span·class="o">=</span><span·class="w">·</span><span·class="nc">xmerl_xsd</span><sp[·...·truncated·by·diffoscope;·len:·219,·SHA:·8546714d1c5192b35941adfbaca669232ae6628287ec9842de106d52763e4dd7·...·]-6">)</span><span·class="p">.</span></code></pre><p>Observe·that·E2·may·differ·from·E·if·for·instance·there·are·default·values
782 defined·in·<code·class="inline">my_XML_Schema.xsd</code>.</p>782 defined·in·<code·class="inline">my_XML_Schema.xsd</code>.</p>
783 ··</section>783 ··</section>
784 </section>784 </section>
  
785 ····</div>785 ····</div>
786 ··</section>786 ··</section>
  
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802 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the802 ········<a·href="https://github.com/elixir-lang/ex_doc"·title="ExDoc"·target="_blank"·rel="help·noopener"·translate="no">ExDoc</a>·(v0.35.1)·for·the
  
803 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>803 ··········<a·href="https://erlang.org"·title="Erlang"·target="_blank"·translate="no">Erlang·programming·language</a>
  
804 ······</p>804 ······</p>
805 <p>Copyright·©·1996-2026·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>805 <p>Copyright·©·1996-2025·<a·href="https://www.ericsson.com">Ericsson·AB</a></p>
806 ····</footer>806 ····</footer>
807 ··</div>807 ··</div>
808 </main>808 </main>
809 </div>809 </div>
810 <script>810 <script>
811 ··function·mermaidLoaded()·{811 ··function·mermaidLoaded()·{
812 ····mermaid.initialize({812 ····mermaid.initialize({
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